ISCSI.cpp@ 41146

Last change on this file since 41146 was 40229, checked in by vboxsync, 13 years ago
Storage/ISCSI: Don't validate the ExpStatSN field of a Login Respone with a non 0 status class because it is not valid. Fixes a crash when trying to login into a LIO target with wrong credentials.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 189.8 KB

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1	/* $Id: ISCSI.cpp 40229 2012-02-23 12:22:21Z vboxsync $ */
2	/** @file
3	* iSCSI initiator driver, VD backend.
4	*/
5
6	/*
7	* Copyright (C) 2006-2011 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_VD_ISCSI
23	#include <VBox/vd-plugin.h>
24	#include <VBox/err.h>
25
26	#include <VBox/log.h>
27	#include <iprt/alloc.h>
28	#include <iprt/assert.h>
29	#include <iprt/uuid.h>
30	#include <iprt/string.h>
31	#include <iprt/asm.h>
32	#include <iprt/thread.h>
33	#include <iprt/semaphore.h>
34	#include <iprt/md5.h>
35	#include <iprt/tcp.h>
36	#include <iprt/time.h>
37	#include <VBox/scsi.h>
38
39
40	/*******************************************************************************
41	* Defined Constants And Macros *
42	*******************************************************************************/
43
44	/** The maximum number of release log entries per image. */
45	#define MAX_LOG_REL_ERRORS 1024
46
47	/** Default port number to use for iSCSI. */
48	#define ISCSI_DEFAULT_PORT 3260
49
50
51	/** Converts a number in the range of 0 - 15 into the corresponding hex char. */
52	#define NUM_2_HEX(b) ('0' + (b) + (((b) > 9) ? 39 : 0))
53	/** Converts a hex char into the corresponding number in the range 0-15. */
54	#define HEX_2_NUM(c) (((c) <= '9') ? ((c) - '0') : (((c - 'A' + 10) & 0xf)))
55	/* Converts a base64 char into the corresponding number in the range 0-63. */
56	#define B64_2_NUM(c) ((c >= 'A' && c <= 'Z') ? (c - 'A') : (c >= 'a' && c <= 'z') ? (c - 'a' + 26) : (c >= '0' && c <= '9') ? (c - '0' + 52) : (c == '+') ? 62 : (c == '/') ? 63 : -1)
57
58
59	/** Minimum CHAP_MD5 challenge length in bytes. */
60	#define CHAP_MD5_CHALLENGE_MIN 16
61	/** Maximum CHAP_MD5 challenge length in bytes. */
62	#define CHAP_MD5_CHALLENGE_MAX 24
63
64
65	/**
66	* SCSI peripheral device type. */
67	typedef enum SCSIDEVTYPE
68	{
69	/** direct-access device. */
70	SCSI_DEVTYPE_DISK = 0,
71	/** sequential-access device. */
72	SCSI_DEVTYPE_TAPE,
73	/** printer device. */
74	SCSI_DEVTYPE_PRINTER,
75	/** processor device. */
76	SCSI_DEVTYPE_PROCESSOR,
77	/** write-once device. */
78	SCSI_DEVTYPE_WORM,
79	/** CD/DVD device. */
80	SCSI_DEVTYPE_CDROM,
81	/** scanner device. */
82	SCSI_DEVTYPE_SCANNER,
83	/** optical memory device. */
84	SCSI_DEVTYPE_OPTICAL,
85	/** medium changer. */
86	SCSI_DEVTYPE_CHANGER,
87	/** communications device. */
88	SCSI_DEVTYPE_COMMUNICATION,
89	/** storage array controller device. */
90	SCSI_DEVTYPE_RAIDCTL = 0x0c,
91	/** enclosure services device. */
92	SCSI_DEVTYPE_ENCLOSURE,
93	/** simplified direct-access device. */
94	SCSI_DEVTYPE_SIMPLEDISK,
95	/** optical card reader/writer device. */
96	SCSI_DEVTYPE_OCRW,
97	/** bridge controller device. */
98	SCSI_DEVTYPE_BRIDGE,
99	/** object-based storage device. */
100	SCSI_DEVTYPE_OSD
101	} SCSIDEVTYPE;
102
103	/** Mask for extracting the SCSI device type out of the first byte of the INQUIRY response. */
104	#define SCSI_DEVTYPE_MASK 0x1f
105
106	/** Mask to extract the CmdQue bit out of the seventh byte of the INQUIRY response. */
107	#define SCSI_INQUIRY_CMDQUE_MASK 0x02
108
109	/** Maximum PDU payload size we can handle in one piece. Greater or equal than
110	* s_iscsiConfigDefaultWriteSplit. */
111	#define ISCSI_DATA_LENGTH_MAX _256K
112
113	/** Maximum PDU size we can handle in one piece. */
114	#define ISCSI_RECV_PDU_BUFFER_SIZE (ISCSI_DATA_LENGTH_MAX + ISCSI_BHS_SIZE)
115
116
117	/** Version of the iSCSI standard which this initiator driver can handle. */
118	#define ISCSI_MY_VERSION 0
119
120
121	/** Length of ISCSI basic header segment. */
122	#define ISCSI_BHS_SIZE 48
123
124
125	/** Reserved task tag value. */
126	#define ISCSI_TASK_TAG_RSVD 0xffffffff
127
128
129	/**
130	* iSCSI opcodes. */
131	typedef enum ISCSIOPCODE
132	{
133	/** NOP-Out. */
134	ISCSIOP_NOP_OUT = 0x00000000,
135	/** SCSI command. */
136	ISCSIOP_SCSI_CMD = 0x01000000,
137	/** SCSI task management request. */
138	ISCSIOP_SCSI_TASKMGMT_REQ = 0x02000000,
139	/** Login request. */
140	ISCSIOP_LOGIN_REQ = 0x03000000,
141	/** Text request. */
142	ISCSIOP_TEXT_REQ = 0x04000000,
143	/** SCSI Data-Out. */
144	ISCSIOP_SCSI_DATA_OUT = 0x05000000,
145	/** Logout request. */
146	ISCSIOP_LOGOUT_REQ = 0x06000000,
147	/** SNACK request. */
148	ISCSIOP_SNACK_REQ = 0x10000000,
149
150	/** NOP-In. */
151	ISCSIOP_NOP_IN = 0x20000000,
152	/** SCSI response. */
153	ISCSIOP_SCSI_RES = 0x21000000,
154	/** SCSI Task Management response. */
155	ISCSIOP_SCSI_TASKMGMT_RES = 0x22000000,
156	/** Login response. */
157	ISCSIOP_LOGIN_RES = 0x23000000,
158	/** Text response. */
159	ISCSIOP_TEXT_RES = 0x24000000,
160	/** SCSI Data-In. */
161	ISCSIOP_SCSI_DATA_IN = 0x25000000,
162	/** Logout response. */
163	ISCSIOP_LOGOUT_RES = 0x26000000,
164	/** Ready To Transfer (R2T). */
165	ISCSIOP_R2T = 0x31000000,
166	/** Asynchronous message. */
167	ISCSIOP_ASYN_MSG = 0x32000000,
168	/** Reject. */
169	ISCSIOP_REJECT = 0x3f000000
170	} ISCSIOPCODE;
171
172	/** Mask for extracting the iSCSI opcode out of the first header word. */
173	#define ISCSIOP_MASK 0x3f000000
174
175
176	/** ISCSI BHS word 0: Request should be processed immediately. */
177	#define ISCSI_IMMEDIATE_DELIVERY_BIT 0x40000000
178
179	/** ISCSI BHS word 0: This is the final PDU for this request/response. */
180	#define ISCSI_FINAL_BIT 0x00800000
181	/** ISCSI BHS word 0: Mask for extracting the CSG. */
182	#define ISCSI_CSG_MASK 0x000c0000
183	/** ISCSI BHS word 0: Shift offset for extracting the CSG. */
184	#define ISCSI_CSG_SHIFT 18
185	/** ISCSI BHS word 0: Mask for extracting the NSG. */
186	#define ISCSI_NSG_MASK 0x00030000
187	/** ISCSI BHS word 0: Shift offset for extracting the NSG. */
188	#define ISCSI_NSG_SHIFT 16
189
190	/** ISCSI BHS word 0: task attribute untagged */
191	#define ISCSI_TASK_ATTR_UNTAGGED 0x00000000
192	/** ISCSI BHS word 0: task attribute simple */
193	#define ISCSI_TASK_ATTR_SIMPLE 0x00010000
194	/** ISCSI BHS word 0: task attribute ordered */
195	#define ISCSI_TASK_ATTR_ORDERED 0x00020000
196	/** ISCSI BHS word 0: task attribute head of queue */
197	#define ISCSI_TASK_ATTR_HOQ 0x00030000
198	/** ISCSI BHS word 0: task attribute ACA */
199	#define ISCSI_TASK_ATTR_ACA 0x00040000
200
201	/** ISCSI BHS word 0: transit to next login phase. */
202	#define ISCSI_TRANSIT_BIT 0x00800000
203	/** ISCSI BHS word 0: continue with login negotiation. */
204	#define ISCSI_CONTINUE_BIT 0x00400000
205
206	/** ISCSI BHS word 0: residual underflow. */
207	#define ISCSI_RESIDUAL_UNFL_BIT 0x00020000
208	/** ISCSI BHS word 0: residual overflow. */
209	#define ISCSI_RESIDUAL_OVFL_BIT 0x00040000
210	/** ISCSI BHS word 0: Bidirectional read residual underflow. */
211	#define ISCSI_BI_READ_RESIDUAL_UNFL_BIT 0x00080000
212	/** ISCSI BHS word 0: Bidirectional read residual overflow. */
213	#define ISCSI_BI_READ_RESIDUAL_OVFL_BIT 0x00100000
214
215	/** ISCSI BHS word 0: SCSI response mask. */
216	#define ISCSI_SCSI_RESPONSE_MASK 0x0000ff00
217	/** ISCSI BHS word 0: SCSI status mask. */
218	#define ISCSI_SCSI_STATUS_MASK 0x000000ff
219
220	/** ISCSI BHS word 0: response includes status. */
221	#define ISCSI_STATUS_BIT 0x00010000
222
223	/** Maximum number of scatter/gather segments needed to send a PDU. */
224	#define ISCSI_SG_SEGMENTS_MAX 4
225
226	/** Number of entries in the command table. */
227	#define ISCSI_CMD_WAITING_ENTRIES 32
228
229	/**
230	* iSCSI login status class. */
231	typedef enum ISCSILOGINSTATUSCLASS
232	{
233	/** Success. */
234	ISCSI_LOGIN_STATUS_CLASS_SUCCESS = 0,
235	/** Redirection. */
236	ISCSI_LOGIN_STATUS_CLASS_REDIRECTION,
237	/** Initiator error. */
238	ISCSI_LOGIN_STATUS_CLASS_INITIATOR_ERROR,
239	/** Target error. */
240	ISCSI_LOGIN_STATUS_CLASS_TARGET_ERROR
241	} ISCSILOGINSTATUSCLASS;
242
243
244	/**
245	* iSCSI connection state. */
246	typedef enum ISCSISTATE
247	{
248	/** Not having a connection/session at all. */
249	ISCSISTATE_FREE,
250	/** Currently trying to login. */
251	ISCSISTATE_IN_LOGIN,
252	/** Normal operation, corresponds roughly to the Full Feature Phase. */
253	ISCSISTATE_NORMAL,
254	/** Currently trying to logout. */
255	ISCSISTATE_IN_LOGOUT
256	} ISCSISTATE;
257
258	/**
259	* iSCSI PDU send flags (and maybe more in the future). */
260	typedef enum ISCSIPDUFLAGS
261	{
262	/** No special flags */
263	ISCSIPDU_DEFAULT = 0,
264	/** Do not attempt to re-attach to the target if the connection is lost */
265	ISCSIPDU_NO_REATTACH = RT_BIT(1)
266	} ISCSIPDUFLAGS;
267
268
269	/*******************************************************************************
270	* Structures and Typedefs *
271	*******************************************************************************/
272
273	/**
274	* iSCSI login negotiation parameter
275	*/
276	typedef struct ISCSIPARAMETER
277	{
278	/** Name of the parameter. */
279	const char *pszParamName;
280	/** Value of the parameter. */
281	const char *pszParamValue;
282	/** Length of the binary parameter. 0=zero-terminated string. */
283	size_t cbParamValue;
284	} ISCSIPARAMETER;
285
286
287	/**
288	* iSCSI Response PDU buffer (scatter).
289	*/
290	typedef struct ISCSIRES
291	{
292	/** Length of PDU segment. */
293	size_t cbSeg;
294	/** Pointer to PDU segment. */
295	void *pvSeg;
296	} ISCSIRES;
297	/** Pointer to an iSCSI Response PDU buffer. */
298	typedef ISCSIRES *PISCSIRES;
299	/** Pointer to a const iSCSI Response PDU buffer. */
300	typedef ISCSIRES const *PCISCSIRES;
301
302
303	/**
304	* iSCSI Request PDU buffer (gather).
305	*/
306	typedef struct ISCSIREQ
307	{
308	/** Length of PDU segment in bytes. */
309	size_t cbSeg;
310	/** Pointer to PDU segment. */
311	const void *pcvSeg;
312	} ISCSIREQ;
313	/** Pointer to an iSCSI Request PDU buffer. */
314	typedef ISCSIREQ *PISCSIREQ;
315	/** Pointer to a const iSCSI Request PDU buffer. */
316	typedef ISCSIREQ const *PCISCSIREQ;
317
318
319	/**
320	* SCSI transfer directions.
321	*/
322	typedef enum SCSIXFER
323	{
324	SCSIXFER_NONE = 0,
325	SCSIXFER_TO_TARGET,
326	SCSIXFER_FROM_TARGET,
327	SCSIXFER_TO_FROM_TARGET
328	} SCSIXFER, *PSCSIXFER;
329
330	/** Forward declaration. */
331	typedef struct ISCSIIMAGE *PISCSIIMAGE;
332
333	/**
334	* SCSI request structure.
335	*/
336	typedef struct SCSIREQ
337	{
338	/** Transfer direction. */
339	SCSIXFER enmXfer;
340	/** Length of command block. */
341	size_t cbCDB;
342	/** Length of Initiator2Target data buffer. */
343	size_t cbI2TData;
344	/** Length of Target2Initiator data buffer. */
345	size_t cbT2IData;
346	/** Length of sense buffer
347	* This contains the number of sense bytes received upon completion. */
348	size_t cbSense;
349	/** Completion status of the command. */
350	uint8_t status;
351	/** Pointer to command block. */
352	void *pvCDB;
353	/** Pointer to sense buffer. */
354	void *pvSense;
355	/** Pointer to the Initiator2Target S/G list. */
356	PRTSGSEG paI2TSegs;
357	/** Number of entries in the I2T S/G list. */
358	unsigned cI2TSegs;
359	/** Pointer to the Target2Initiator S/G list. */
360	PRTSGSEG paT2ISegs;
361	/** Number of entries in the T2I S/G list. */
362	unsigned cT2ISegs;
363	/** S/G buffer for the target to initiator bits. */
364	RTSGBUF SgBufT2I;
365	} SCSIREQ, *PSCSIREQ;
366
367	/**
368	* Async request structure holding all necessary data for
369	* request processing.
370	*/
371	typedef struct SCSIREQASYNC
372	{
373	/** I/O context associated with this request. */
374	PVDIOCTX pIoCtx;
375	/** Pointer to the SCSI request structure. */
376	PSCSIREQ pScsiReq;
377	/** The CDB. */
378	uint8_t abCDB[16];
379	/** The sense buffer. */
380	uint8_t abSense[96];
381	/** Status code to return if we got sense data. */
382	int rcSense;
383	/** Number of retries if the command completes with sense
384	* data before we return with an error.
385	*/
386	unsigned cSenseRetries;
387	/** The number of entries in the I2T S/G list. */
388	unsigned cI2TSegs;
389	/** The number of entries in the T2I S/G list. */
390	unsigned cT2ISegs;
391	/** The S/G list - variable in size.
392	* This array holds both the I2T and T2I segments.
393	* The I2T segments are first and the T2I are second.
394	*/
395	RTSGSEG aSegs[1];
396	} SCSIREQASYNC, *PSCSIREQASYNC;
397
398	typedef enum ISCSICMDTYPE
399	{
400	/** Process a SCSI request. */
401	ISCSICMDTYPE_REQ = 0,
402	/** Call a function in the I/O thread. */
403	ISCSICMDTYPE_EXEC,
404	/** Usual 32bit hack. */
405	ISCSICMDTYPE_32BIT_HACK = 0x7fffffff
406	} ISCSICMDTYPE;
407
408
409	/** The command completion function. */
410	typedef DECLCALLBACK(void) FNISCSICMDCOMPLETED(PISCSIIMAGE pImage, int rcReq, void *pvUser);
411	/** Pointer to a command completion function. */
412	typedef FNISCSICMDCOMPLETED *PFNISCSICMDCOMPLETED;
413
414	/** The command execution function. */
415	typedef DECLCALLBACK(int) FNISCSIEXEC(void *pvUser);
416	/** Pointer to a command execution function. */
417	typedef FNISCSIEXEC *PFNISCSIEXEC;
418
419	/**
420	* Structure used to complete a synchronous request.
421	*/
422	typedef struct ISCSICMDSYNC
423	{
424	/** Event semaphore to wakeup the waiting thread. */
425	RTSEMEVENT EventSem;
426	/** Status code of the command. */
427	int rcCmd;
428	} ISCSICMDSYNC, *PISCSICMDSYNC;
429
430	/**
431	* iSCSI command.
432	* Used to forward requests to the I/O thread
433	* if existing.
434	*/
435	typedef struct ISCSICMD
436	{
437	/** Next one in the list. */
438	struct ISCSICMD *pNext;
439	/** Assigned ITT. */
440	uint32_t Itt;
441	/** Completion callback. */
442	PFNISCSICMDCOMPLETED pfnComplete;
443	/** Opaque user data. */
444	void *pvUser;
445	/** Command to execute. */
446	ISCSICMDTYPE enmCmdType;
447	/** Command type dependent data. */
448	union
449	{
450	/** Process a SCSI request. */
451	struct
452	{
453	/** The SCSI request to process. */
454	PSCSIREQ pScsiReq;
455	} ScsiReq;
456	/** Call a function in the I/O thread. */
457	struct
458	{
459	/** The method to execute. */
460	PFNISCSIEXEC pfnExec;
461	/** User data. */
462	void *pvUser;
463	} Exec;
464	} CmdType;
465	} ISCSICMD, *PISCSICMD;
466
467	/**
468	* Send iSCSI PDU.
469	* Contains all necessary data to send a PDU.
470	*/
471	typedef struct ISCSIPDUTX
472	{
473	/** Pointer to the next PDu to send. */
474	struct ISCSIPDUTX *pNext;
475	/** The BHS. */
476	uint32_t aBHS[12];
477	/** Assigned CmdSN for this PDU. */
478	uint32_t CmdSN;
479	/** The S/G buffer used for sending. */
480	RTSGBUF SgBuf;
481	/** Number of bytes to send until the PDU completed. */
482	size_t cbSgLeft;
483	/** The iSCSI command this PDU belongs to. */
484	PISCSICMD pIScsiCmd;
485	/** Number of segments in the request segments array. */
486	unsigned cISCSIReq;
487	/** The request segments - variable in size. */
488	RTSGSEG aISCSIReq[1];
489	} ISCSIPDUTX, *PISCSIPDUTX;
490
491	/**
492	* Block driver instance data.
493	*/
494	typedef struct ISCSIIMAGE
495	{
496	/** Pointer to the filename (location). Not really used. */
497	const char *pszFilename;
498	/** Pointer to the initiator name. */
499	char *pszInitiatorName;
500	/** Pointer to the target name. */
501	char *pszTargetName;
502	/** Pointer to the target address. */
503	char *pszTargetAddress;
504	/** Pointer to the user name for authenticating the Initiator. */
505	char *pszInitiatorUsername;
506	/** Pointer to the secret for authenticating the Initiator. */
507	uint8_t *pbInitiatorSecret;
508	/** Length of the secret for authenticating the Initiator. */
509	size_t cbInitiatorSecret;
510	/** Pointer to the user name for authenticating the Target. */
511	char *pszTargetUsername;
512	/** Pointer to the secret for authenticating the Initiator. */
513	uint8_t *pbTargetSecret;
514	/** Length of the secret for authenticating the Initiator. */
515	size_t cbTargetSecret;
516	/** Limit for iSCSI writes, essentially limiting the amount of data
517	* written in a single write. This is negotiated with the target, so
518	* the actual size might be smaller. */
519	uint32_t cbWriteSplit;
520	/** Initiator session identifier. */
521	uint64_t ISID;
522	/** SCSI Logical Unit Number. */
523	uint64_t LUN;
524	/** Pointer to the per-disk VD interface list. */
525	PVDINTERFACE pVDIfsDisk;
526	/** Pointer to the per-image VD interface list. */
527	PVDINTERFACE pVDIfsImage;
528	/** Error interface. */
529	PVDINTERFACEERROR pIfError;
530	/** Config interface. */
531	PVDINTERFACECONFIG pIfConfig;
532	/** I/O interface. */
533	PVDINTERFACEIOINT pIfIo;
534	/** TCP network stack interface. */
535	PVDINTERFACETCPNET pIfNet;
536	/** Image open flags. */
537	unsigned uOpenFlags;
538	/** Number of re-login retries when a connection fails. */
539	uint32_t cISCSIRetries;
540	/** Sector size on volume. */
541	uint32_t cbSector;
542	/** Size of volume in sectors. */
543	uint64_t cVolume;
544	/** Total volume size in bytes. Easier than multiplying the above values all the time. */
545	uint64_t cbSize;
546
547	/** Negotiated maximum data length when sending to target. */
548	uint32_t cbSendDataLength;
549	/** Negotiated maximum data length when receiving from target. */
550	uint32_t cbRecvDataLength;
551
552	/** Current state of the connection/session. */
553	ISCSISTATE state;
554	/** Flag whether the first Login Response PDU has been seen. */
555	bool FirstRecvPDU;
556	/** Initiator Task Tag of the last iSCSI request PDU. */
557	uint32_t ITT;
558	/** Sequence number of the last command. */
559	uint32_t CmdSN;
560	/** Sequence number of the next command expected by the target. */
561	uint32_t ExpCmdSN;
562	/** Maximum sequence number accepted by the target (determines size of window). */
563	uint32_t MaxCmdSN;
564	/** Expected sequence number of next status. */
565	uint32_t ExpStatSN;
566	/** Currently active request. */
567	PISCSIREQ paCurrReq;
568	/** Segment number of currently active request. */
569	uint32_t cnCurrReq;
570	/** Pointer to receive PDU buffer. (Freed by RT) */
571	void *pvRecvPDUBuf;
572	/** Length of receive PDU buffer. */
573	size_t cbRecvPDUBuf;
574	/** Mutex protecting against concurrent use from several threads. */
575	RTSEMMUTEX Mutex;
576
577	/** Pointer to the target hostname. */
578	char *pszHostname;
579	/** Port to use on the target host. */
580	uint32_t uPort;
581	/** Socket handle of the TCP connection. */
582	VDSOCKET Socket;
583	/** Timeout for read operations on the TCP connection (in milliseconds). */
584	uint32_t uReadTimeout;
585	/** Flag whether to automatically generate the initiator name. */
586	bool fAutomaticInitiatorName;
587	/** Flag whether to use the host IP stack or DevINIP. */
588	bool fHostIP;
589
590	/** Head of request queue */
591	PISCSICMD pScsiReqQueue;
592	/** Mutex protecting the request queue from concurrent access. */
593	RTSEMMUTEX MutexReqQueue;
594	/** I/O thread. */
595	RTTHREAD hThreadIo;
596	/** Flag whether the thread should be still running. */
597	volatile bool fRunning;
598	/* Flag whether the target supports command queuing. */
599	bool fCmdQueuingSupported;
600	/** Flag whether extended select is supported. */
601	bool fExtendedSelectSupported;
602	/** Padding used for aligning the PDUs. */
603	uint8_t aPadding[4];
604	/** Socket events to poll for. */
605	uint32_t fPollEvents;
606	/** Number of bytes to read to complete the current PDU. */
607	size_t cbRecvPDUResidual;
608	/** Current position in the PDU buffer. */
609	uint8_t *pbRecvPDUBufCur;
610	/** Flag whether we are currently reading the BHS. */
611	bool fRecvPDUBHS;
612	/** List of PDUs waiting to get transmitted. */
613	PISCSIPDUTX pIScsiPDUTxHead;
614	/** Tail of PDUs waiting to get transmitted. */
615	PISCSIPDUTX pIScsiPDUTxTail;
616	/** PDU we are currently transmitting. */
617	PISCSIPDUTX pIScsiPDUTxCur;
618	/** Number of commands waiting for an answer from the target.
619	* Used for timeout handling for poll.
620	*/
621	unsigned cCmdsWaiting;
622	/** Table of commands waiting for a response from the target. */
623	PISCSICMD aCmdsWaiting[ISCSI_CMD_WAITING_ENTRIES];
624
625	/** Release log counter. */
626	unsigned cLogRelErrors;
627	} ISCSIIMAGE;
628
629
630	/*******************************************************************************
631	* Static Variables *
632	*******************************************************************************/
633
634	/** Default initiator basename. */
635	static const char *s_iscsiDefaultInitiatorBasename = "iqn.2009-08.com.sun.virtualbox.initiator";
636
637	/** Default LUN. */
638	static const char *s_iscsiConfigDefaultLUN = "0";
639
640	/** Default timeout, 10 seconds. */
641	static const char *s_iscsiConfigDefaultTimeout = "10000";
642
643	/** Default write split value, less or equal to ISCSI_DATA_LENGTH_MAX. */
644	static const char *s_iscsiConfigDefaultWriteSplit = "262144";
645
646	/** Default host IP stack. */
647	static const char *s_iscsiConfigDefaultHostIPStack = "1";
648
649	/** Description of all accepted config parameters. */
650	static const VDCONFIGINFO s_iscsiConfigInfo[] =
651	{
652	{ "TargetName", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
653	/* LUN is defined of string type to handle the "enc" prefix. */
654	{ "LUN", s_iscsiConfigDefaultLUN, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
655	{ "TargetAddress", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_MANDATORY },
656	{ "InitiatorName", NULL, VDCFGVALUETYPE_STRING, 0 },
657	{ "InitiatorUsername", NULL, VDCFGVALUETYPE_STRING, 0 },
658	{ "InitiatorSecret", NULL, VDCFGVALUETYPE_BYTES, 0 },
659	{ "TargetUsername", NULL, VDCFGVALUETYPE_STRING, VD_CFGKEY_EXPERT },
660	{ "TargetSecret", NULL, VDCFGVALUETYPE_BYTES, VD_CFGKEY_EXPERT },
661	{ "WriteSplit", s_iscsiConfigDefaultWriteSplit, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
662	{ "Timeout", s_iscsiConfigDefaultTimeout, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
663	{ "HostIPStack", s_iscsiConfigDefaultHostIPStack, VDCFGVALUETYPE_INTEGER, VD_CFGKEY_EXPERT },
664	{ NULL, NULL, VDCFGVALUETYPE_INTEGER, 0 }
665	};
666
667	/*******************************************************************************
668	* Internal Functions *
669	*******************************************************************************/
670
671	/* iSCSI low-level functions (only to be used from the iSCSI high-level functions). */
672	static uint32_t iscsiNewITT(PISCSIIMAGE pImage);
673	static int iscsiSendPDU(PISCSIIMAGE pImage, PISCSIREQ paReq, uint32_t cnReq, uint32_t uFlags);
674	static int iscsiRecvPDU(PISCSIIMAGE pImage, uint32_t itt, PISCSIRES paRes, uint32_t cnRes);
675	static int iscsiRecvPDUAsync(PISCSIIMAGE pImage);
676	static int iscsiSendPDUAsync(PISCSIIMAGE pImage);
677	static int iscsiValidatePDU(PISCSIRES paRes, uint32_t cnRes);
678	static int iscsiRecvPDUProcess(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes);
679	static int iscsiPDUTxPrepare(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd);
680	static int iscsiRecvPDUUpdateRequest(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes);
681	static void iscsiCmdComplete(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd, int rcCmd);
682	static int iscsiTextAddKeyValue(uint8_t pbBuf, size_t cbBuf, size_t pcbBufCurr, const char pcszKey, const char pcszValue, size_t cbValue);
683	static int iscsiTextGetKeyValue(const uint8_t pbBuf, size_t cbBuf, const char pcszKey, const char **ppcszValue);
684	static int iscsiStrToBinary(const char pcszValue, uint8_t pbValue, size_t *pcbValue);
685	static int iscsiUpdateParameters(PISCSIIMAGE pImage, const uint8_t *pbBuf, size_t cbBuf);
686
687	/* Serial number arithmetic comparison. */
688	static bool serial_number_less(uint32_t sn1, uint32_t sn2);
689	static bool serial_number_greater(uint32_t sn1, uint32_t sn2);
690
691	/* CHAP-MD5 functions. */
692	#ifdef IMPLEMENT_TARGET_AUTH
693	static void chap_md5_generate_challenge(uint8_t pbChallenge, size_t pcbChallenge);
694	#endif
695	static void chap_md5_compute_response(uint8_t pbResponse, uint8_t id, const uint8_t pbChallenge, size_t cbChallenge,
696	const uint8_t *pbSecret, size_t cbSecret);
697
698	/**
699	* Internal: release log wrapper limiting the number of entries.
700	*/
701	DECLINLINE(void) iscsiLogRel(PISCSIIMAGE pImage, const char *pcszFormat, ...)
702	{
703	if (pImage->cLogRelErrors++ < MAX_LOG_REL_ERRORS)
704	{
705	va_list va;
706
707	va_start(va, pcszFormat);
708	LogRel(("%N\n", pcszFormat, &va));
709	va_end(va);
710	}
711	}
712
713	DECLINLINE(bool) iscsiIsClientConnected(PISCSIIMAGE pImage)
714	{
715	return pImage->Socket != NIL_VDSOCKET
716	&& pImage->pIfNet->pfnIsClientConnected(pImage->Socket);
717	}
718
719	/**
720	* Calculates the hash for the given ITT used
721	* to look up the command in the table.
722	*/
723	DECLINLINE(uint32_t) iscsiIttHash(uint32_t Itt)
724	{
725	return Itt % ISCSI_CMD_WAITING_ENTRIES;
726	}
727
728	static PISCSICMD iscsiCmdGetFromItt(PISCSIIMAGE pImage, uint32_t Itt)
729	{
730	PISCSICMD pIScsiCmd = NULL;
731
732	pIScsiCmd = pImage->aCmdsWaiting[iscsiIttHash(Itt)];
733
734	while ( pIScsiCmd
735	&& pIScsiCmd->Itt != Itt)
736	pIScsiCmd = pIScsiCmd->pNext;
737
738	return pIScsiCmd;
739	}
740
741	static void iscsiCmdInsert(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
742	{
743	PISCSICMD pIScsiCmdOld;
744	uint32_t idx = iscsiIttHash(pIScsiCmd->Itt);
745
746	Assert(!pIScsiCmd->pNext);
747
748	pIScsiCmdOld = pImage->aCmdsWaiting[idx];
749	pIScsiCmd->pNext = pIScsiCmdOld;
750	pImage->aCmdsWaiting[idx] = pIScsiCmd;
751	pImage->cCmdsWaiting++;
752	}
753
754	static PISCSICMD iscsiCmdRemove(PISCSIIMAGE pImage, uint32_t Itt)
755	{
756	PISCSICMD pIScsiCmd = NULL;
757	PISCSICMD pIScsiCmdPrev = NULL;
758	uint32_t idx = iscsiIttHash(Itt);
759
760	pIScsiCmd = pImage->aCmdsWaiting[idx];
761
762	while ( pIScsiCmd
763	&& pIScsiCmd->Itt != Itt)
764	{
765	pIScsiCmdPrev = pIScsiCmd;
766	pIScsiCmd = pIScsiCmd->pNext;
767	}
768
769	if (pIScsiCmd)
770	{
771	if (pIScsiCmdPrev)
772	{
773	Assert(!pIScsiCmd->pNext \|\| VALID_PTR(pIScsiCmd->pNext));
774	pIScsiCmdPrev->pNext = pIScsiCmd->pNext;
775	}
776	else
777	{
778	pImage->aCmdsWaiting[idx] = pIScsiCmd->pNext;
779	Assert(!pImage->aCmdsWaiting[idx] \|\| VALID_PTR(pImage->aCmdsWaiting[idx]));
780	}
781	pImage->cCmdsWaiting--;
782	}
783
784	return pIScsiCmd;
785	}
786
787	/**
788	* Removes all commands from the table and returns the
789	* list head
790	*
791	* @returns Pointer to the head of teh command list.
792	* @param pImage iSCSI connection to use.
793	*/
794	static PISCSICMD iscsiCmdRemoveAll(PISCSIIMAGE pImage)
795	{
796	PISCSICMD pIScsiCmdHead = NULL;
797
798	for (unsigned idx = 0; idx < RT_ELEMENTS(pImage->aCmdsWaiting); idx++)
799	{
800	PISCSICMD pHead;
801	PISCSICMD pTail;
802
803	pHead = pImage->aCmdsWaiting[idx];
804	pImage->aCmdsWaiting[idx] = NULL;
805
806	if (pHead)
807	{
808	/* Get the tail. */
809	pTail = pHead;
810	while (pTail->pNext)
811	pTail = pTail->pNext;
812
813	/* Concatenate. */
814	pTail->pNext = pIScsiCmdHead;
815	pIScsiCmdHead = pHead;
816	}
817	}
818	pImage->cCmdsWaiting = 0;
819
820	return pIScsiCmdHead;
821	}
822
823	static int iscsiTransportConnect(PISCSIIMAGE pImage)
824	{
825	int rc;
826	if (!pImage->pszHostname)
827	return VERR_NET_DEST_ADDRESS_REQUIRED;
828
829	rc = pImage->pIfNet->pfnClientConnect(pImage->Socket, pImage->pszHostname, pImage->uPort);
830	if (RT_FAILURE(rc))
831	{
832	if ( rc == VERR_NET_CONNECTION_REFUSED
833	\|\| rc == VERR_NET_CONNECTION_RESET
834	\|\| rc == VERR_NET_UNREACHABLE
835	\|\| rc == VERR_NET_HOST_UNREACHABLE
836	\|\| rc == VERR_NET_CONNECTION_TIMED_OUT)
837	{
838	/* Standardize return value for no connection. */
839	rc = VERR_NET_CONNECTION_REFUSED;
840	}
841	return rc;
842	}
843
844	/* Disable Nagle algorithm, we want things to be sent immediately. */
845	pImage->pIfNet->pfnSetSendCoalescing(pImage->Socket, false);
846
847	/* Make initiator name and ISID unique on this host. */
848	RTNETADDR LocalAddr;
849	rc = pImage->pIfNet->pfnGetLocalAddress(pImage->Socket, &LocalAddr);
850	if (RT_FAILURE(rc))
851	return rc;
852	if ( LocalAddr.uPort == RTNETADDR_PORT_NA
853	\|\| LocalAddr.uPort > 65535)
854	return VERR_NET_ADDRESS_FAMILY_NOT_SUPPORTED;
855	pImage->ISID &= ~65535ULL;
856	pImage->ISID \|= LocalAddr.uPort;
857	/* Eliminate the port so that it isn't included below. */
858	LocalAddr.uPort = RTNETADDR_PORT_NA;
859	if (pImage->fAutomaticInitiatorName)
860	{
861	if (pImage->pszInitiatorName)
862	RTStrFree(pImage->pszInitiatorName);
863	RTStrAPrintf(&pImage->pszInitiatorName, "%s:01:%RTnaddr",
864	s_iscsiDefaultInitiatorBasename, &LocalAddr);
865	if (!pImage->pszInitiatorName)
866	return VERR_NO_MEMORY;
867	}
868	LogRel(("iSCSI: connect from initiator %s with source port %u\n", pImage->pszInitiatorName, pImage->ISID & 65535));
869	return VINF_SUCCESS;
870	}
871
872
873	static int iscsiTransportClose(PISCSIIMAGE pImage)
874	{
875	int rc;
876
877	LogFlowFunc(("(%s:%d)\n", pImage->pszHostname, pImage->uPort));
878	if (iscsiIsClientConnected(pImage))
879	{
880	LogRel(("iSCSI: disconnect from initiator %s with source port %u\n", pImage->pszInitiatorName, pImage->ISID & 65535));
881	rc = pImage->pIfNet->pfnClientClose(pImage->Socket);
882	}
883	else
884	rc = VINF_SUCCESS;
885	LogFlowFunc(("returns %Rrc\n", rc));
886	return rc;
887	}
888
889
890	static int iscsiTransportRead(PISCSIIMAGE pImage, PISCSIRES paResponse, unsigned int cnResponse)
891	{
892	int rc = VINF_SUCCESS;
893	unsigned int i = 0;
894	size_t cbToRead, cbActuallyRead, residual, cbSegActual = 0, cbAHSLength, cbDataLength;
895	char *pDst;
896
897	LogFlowFunc(("cnResponse=%d (%s:%d)\n", cnResponse, pImage->pszHostname, pImage->uPort));
898	if (!iscsiIsClientConnected(pImage))
899	{
900	/* Reconnecting makes no sense in this case, as there will be nothing
901	* to receive. We would just run into a timeout. */
902	rc = VERR_BROKEN_PIPE;
903	}
904
905	if (RT_SUCCESS(rc) && paResponse[0].cbSeg >= ISCSI_BHS_SIZE)
906	{
907	cbToRead = 0;
908	residual = ISCSI_BHS_SIZE; /* Do not read more than the BHS length before the true PDU length is known. */
909	cbSegActual = residual;
910	pDst = (char *)paResponse[i].pvSeg;
911	uint64_t u64Timeout = RTTimeMilliTS() + pImage->uReadTimeout;
912	do
913	{
914	int64_t cMilliesRemaining = u64Timeout - RTTimeMilliTS();
915	if (cMilliesRemaining <= 0)
916	{
917	rc = VERR_TIMEOUT;
918	break;
919	}
920	Assert(cMilliesRemaining < 1000000);
921	rc = pImage->pIfNet->pfnSelectOne(pImage->Socket, cMilliesRemaining);
922	if (RT_FAILURE(rc))
923	break;
924	rc = pImage->pIfNet->pfnRead(pImage->Socket, pDst, residual, &cbActuallyRead);
925	if (RT_FAILURE(rc))
926	break;
927	if (cbActuallyRead == 0)
928	{
929	/* The other end has closed the connection. */
930	iscsiTransportClose(pImage);
931	pImage->state = ISCSISTATE_FREE;
932	rc = VERR_NET_CONNECTION_RESET;
933	break;
934	}
935	if (cbToRead == 0)
936	{
937	/* Currently reading the BHS. */
938	residual -= cbActuallyRead;
939	pDst += cbActuallyRead;
940	if (residual <= 40)
941	{
942	/* Enough data read to figure out the actual PDU size. */
943	uint32_t word1 = RT_N2H_U32(((uint32_t *)(paResponse[0].pvSeg))[1]);
944	cbAHSLength = (word1 & 0xff000000) >> 24;
945	cbAHSLength = ((cbAHSLength - 1) \| 3) + 1; /* Add padding. */
946	cbDataLength = word1 & 0x00ffffff;
947	cbDataLength = ((cbDataLength - 1) \| 3) + 1; /* Add padding. */
948	cbToRead = residual + cbAHSLength + cbDataLength;
949	residual += paResponse[0].cbSeg - ISCSI_BHS_SIZE;
950	if (residual > cbToRead)
951	residual = cbToRead;
952	cbSegActual = ISCSI_BHS_SIZE + cbAHSLength + cbDataLength;
953	/* Check whether we are already done with this PDU (no payload). */
954	if (cbToRead == 0)
955	break;
956	}
957	}
958	else
959	{
960	cbToRead -= cbActuallyRead;
961	if (cbToRead == 0)
962	break;
963	pDst += cbActuallyRead;
964	residual -= cbActuallyRead;
965	}
966	if (residual == 0)
967	{
968	i++;
969	if (i >= cnResponse)
970	{
971	/* No space left in receive buffers. */
972	rc = VERR_BUFFER_OVERFLOW;
973	break;
974	}
975	pDst = (char *)paResponse[i].pvSeg;
976	residual = paResponse[i].cbSeg;
977	if (residual > cbToRead)
978	residual = cbToRead;
979	cbSegActual = residual;
980	}
981	LogFlowFunc(("cbToRead=%u residual=%u cbSegActual=%u cbActuallRead=%u\n",
982	cbToRead, residual, cbSegActual, cbActuallyRead));
983	} while (true);
984	}
985	else
986	{
987	if (RT_SUCCESS(rc))
988	rc = VERR_BUFFER_OVERFLOW;
989	}
990	if (RT_SUCCESS(rc))
991	{
992	paResponse[i].cbSeg = cbSegActual;
993	for (i++; i < cnResponse; i++)
994	paResponse[i].cbSeg = 0;
995	}
996
997	if (RT_UNLIKELY( RT_FAILURE(rc)
998	&& ( rc == VERR_NET_CONNECTION_RESET
999	\|\| rc == VERR_NET_CONNECTION_ABORTED
1000	\|\| rc == VERR_NET_CONNECTION_RESET_BY_PEER
1001	\|\| rc == VERR_NET_CONNECTION_REFUSED
1002	\|\| rc == VERR_BROKEN_PIPE)))
1003	{
1004	/* Standardize return value for broken connection. */
1005	rc = VERR_BROKEN_PIPE;
1006	}
1007
1008	LogFlowFunc(("returns %Rrc\n", rc));
1009	return rc;
1010	}
1011
1012
1013	static int iscsiTransportWrite(PISCSIIMAGE pImage, PISCSIREQ paRequest, unsigned int cnRequest)
1014	{
1015	int rc = VINF_SUCCESS;
1016	uint32_t pad = 0;
1017	unsigned int i;
1018
1019	LogFlowFunc(("cnRequest=%d (%s:%d)\n", cnRequest, pImage->pszHostname, pImage->uPort));
1020	if (!iscsiIsClientConnected(pImage))
1021	{
1022	/* Attempt to reconnect if the connection was previously broken. */
1023	rc = iscsiTransportConnect(pImage);
1024	}
1025
1026	if (RT_SUCCESS(rc))
1027	{
1028	/* Construct scatter/gather buffer for entire request, worst case
1029	* needs twice as many entries to allow for padding. */
1030	unsigned cBuf = 0;
1031	for (i = 0; i < cnRequest; i++)
1032	{
1033	cBuf++;
1034	if (paRequest[i].cbSeg & 3)
1035	cBuf++;
1036	}
1037	Assert(cBuf < ISCSI_SG_SEGMENTS_MAX);
1038	RTSGBUF buf;
1039	RTSGSEG aSeg[ISCSI_SG_SEGMENTS_MAX];
1040	static char aPad[4] = { 0, 0, 0, 0 };
1041	RTSgBufInit(&buf, &aSeg[0], cBuf);
1042	unsigned iBuf = 0;
1043	for (i = 0; i < cnRequest; i++)
1044	{
1045	/* Actual data chunk. */
1046	aSeg[iBuf].pvSeg = (void *)paRequest[i].pcvSeg;
1047	aSeg[iBuf].cbSeg = paRequest[i].cbSeg;
1048	iBuf++;
1049	/* Insert proper padding before the next chunk. */
1050	if (paRequest[i].cbSeg & 3)
1051	{
1052	aSeg[iBuf].pvSeg = &aPad[0];
1053	aSeg[iBuf].cbSeg = 4 - (paRequest[i].cbSeg & 3);
1054	iBuf++;
1055	}
1056	}
1057	/* Send out the request, the socket is set to send data immediately,
1058	* avoiding unnecessary delays. */
1059	rc = pImage->pIfNet->pfnSgWrite(pImage->Socket, &buf);
1060
1061	}
1062
1063	if (RT_UNLIKELY( RT_FAILURE(rc)
1064	&& ( rc == VERR_NET_CONNECTION_RESET
1065	\|\| rc == VERR_NET_CONNECTION_ABORTED
1066	\|\| rc == VERR_NET_CONNECTION_RESET_BY_PEER
1067	\|\| rc == VERR_NET_CONNECTION_REFUSED
1068	\|\| rc == VERR_BROKEN_PIPE)))
1069	{
1070	/* Standardize return value for broken connection. */
1071	rc = VERR_BROKEN_PIPE;
1072	}
1073
1074	LogFlowFunc(("returns %Rrc\n", rc));
1075	return rc;
1076	}
1077
1078
1079	static int iscsiTransportOpen(PISCSIIMAGE pImage)
1080	{
1081	int rc = VINF_SUCCESS;
1082	size_t cbHostname = 0; /* shut up gcc */
1083	const char pcszPort = NULL; / shut up gcc */
1084	char *pszPortEnd;
1085	uint16_t uPort;
1086
1087	/* Clean up previous connection data. */
1088	iscsiTransportClose(pImage);
1089	if (pImage->pszHostname)
1090	{
1091	RTMemFree(pImage->pszHostname);
1092	pImage->pszHostname = NULL;
1093	pImage->uPort = 0;
1094	}
1095
1096	/* Locate the port number via the colon separating the hostname from the port. */
1097	if (*pImage->pszTargetAddress)
1098	{
1099	if (*pImage->pszTargetAddress != '[')
1100	{
1101	/* Normal hostname or IPv4 dotted decimal. */
1102	pcszPort = strchr(pImage->pszTargetAddress, ':');
1103	if (pcszPort != NULL)
1104	{
1105	cbHostname = pcszPort - pImage->pszTargetAddress;
1106	pcszPort++;
1107	}
1108	else
1109	cbHostname = strlen(pImage->pszTargetAddress);
1110	}
1111	else
1112	{
1113	/* IPv6 literal address. Contains colons, so skip to closing square bracket. */
1114	pcszPort = strchr(pImage->pszTargetAddress, ']');
1115	if (pcszPort != NULL)
1116	{
1117	pcszPort++;
1118	cbHostname = pcszPort - pImage->pszTargetAddress;
1119	if (*pcszPort == '\0')
1120	pcszPort = NULL;
1121	else if (*pcszPort != ':')
1122	rc = VERR_PARSE_ERROR;
1123	else
1124	pcszPort++;
1125	}
1126	else
1127	rc = VERR_PARSE_ERROR;
1128	}
1129	}
1130	else
1131	rc = VERR_PARSE_ERROR;
1132
1133	/* Now split address into hostname and port. */
1134	if (RT_SUCCESS(rc))
1135	{
1136	pImage->pszHostname = (char *)RTMemAlloc(cbHostname + 1);
1137	if (!pImage->pszHostname)
1138	rc = VERR_NO_MEMORY;
1139	else
1140	{
1141	memcpy(pImage->pszHostname, pImage->pszTargetAddress, cbHostname);
1142	pImage->pszHostname[cbHostname] = '\0';
1143	if (pcszPort != NULL)
1144	{
1145	rc = RTStrToUInt16Ex(pcszPort, &pszPortEnd, 0, &uPort);
1146	/* Note that RT_SUCCESS() macro to check the rc value is not strict enough in this case. */
1147	if (rc == VINF_SUCCESS && *pszPortEnd == '\0' && uPort != 0)
1148	{
1149	pImage->uPort = uPort;
1150	}
1151	else
1152	{
1153	rc = VERR_PARSE_ERROR;
1154	}
1155	}
1156	else
1157	pImage->uPort = ISCSI_DEFAULT_PORT;
1158	}
1159	}
1160
1161	if (RT_SUCCESS(rc))
1162	{
1163	if (!iscsiIsClientConnected(pImage))
1164	rc = iscsiTransportConnect(pImage);
1165	}
1166	else
1167	{
1168	if (pImage->pszHostname)
1169	{
1170	RTMemFree(pImage->pszHostname);
1171	pImage->pszHostname = NULL;
1172	}
1173	pImage->uPort = 0;
1174	}
1175
1176	LogFlowFunc(("returns %Rrc\n", rc));
1177	return rc;
1178	}
1179
1180
1181	/**
1182	* Attach to an iSCSI target. Performs all operations necessary to enter
1183	* Full Feature Phase.
1184	*
1185	* @returns VBox status.
1186	* @param pImage The iSCSI connection state to be used.
1187	*/
1188	static int iscsiAttach(void *pvUser)
1189	{
1190	int rc;
1191	uint32_t itt;
1192	uint32_t csg, nsg, substate;
1193	uint64_t isid_tsih;
1194	uint8_t bBuf[4096]; /* Should be large enough even for large authentication values. */
1195	size_t cbBuf;
1196	bool transit;
1197	uint8_t pbChallenge[1024]; /* RFC3720 specifies this as maximum. */
1198	size_t cbChallenge = 0; /* shut up gcc */
1199	uint8_t bChapIdx;
1200	uint8_t aResponse[RTMD5HASHSIZE];
1201	uint32_t cnISCSIReq;
1202	ISCSIREQ aISCSIReq[4];
1203	uint32_t aReqBHS[12];
1204	uint32_t cnISCSIRes;
1205	ISCSIRES aISCSIRes[2];
1206	uint32_t aResBHS[12];
1207	char *pszNext;
1208	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
1209
1210	bool fParameterNeg = true;;
1211	pImage->cbRecvDataLength = ISCSI_DATA_LENGTH_MAX;
1212	pImage->cbSendDataLength = RT_MIN(ISCSI_DATA_LENGTH_MAX, pImage->cbWriteSplit);
1213	char szMaxDataLength[16];
1214	RTStrPrintf(szMaxDataLength, sizeof(szMaxDataLength), "%u", ISCSI_DATA_LENGTH_MAX);
1215	ISCSIPARAMETER aParameterNeg[] =
1216	{
1217	{ "HeaderDigest", "None", 0 },
1218	{ "DataDigest", "None", 0 },
1219	{ "MaxConnections", "1", 0 },
1220	{ "InitialR2T", "No", 0 },
1221	{ "ImmediateData", "Yes", 0 },
1222	{ "MaxRecvDataSegmentLength", szMaxDataLength, 0 },
1223	{ "MaxBurstLength", szMaxDataLength, 0 },
1224	{ "FirstBurstLength", szMaxDataLength, 0 },
1225	{ "DefaultTime2Wait", "0", 0 },
1226	{ "DefaultTime2Retain", "60", 0 },
1227	{ "DataPDUInOrder", "Yes", 0 },
1228	{ "DataSequenceInOrder", "Yes", 0 },
1229	{ "ErrorRecoveryLevel", "0", 0 },
1230	{ "MaxOutstandingR2T", "1", 0 }
1231	};
1232
1233	LogFlowFunc(("entering\n"));
1234
1235	Assert(pImage->state == ISCSISTATE_FREE);
1236
1237	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1238
1239	/* Make 100% sure the connection isn't reused for a new login. */
1240	iscsiTransportClose(pImage);
1241
1242	restart:
1243	if (!iscsiIsClientConnected(pImage))
1244	{
1245	rc = iscsiTransportOpen(pImage);
1246	if (RT_FAILURE(rc))
1247	goto out;
1248	}
1249
1250	pImage->state = ISCSISTATE_IN_LOGIN;
1251	pImage->ITT = 1;
1252	pImage->FirstRecvPDU = true;
1253	pImage->CmdSN = 1;
1254	pImage->ExpCmdSN = 0;
1255	pImage->MaxCmdSN = 1;
1256	pImage->ExpStatSN = 0;
1257
1258	/*
1259	* Send login request to target.
1260	*/
1261	itt = iscsiNewITT(pImage);
1262	csg = 0;
1263	nsg = 0;
1264	substate = 0;
1265	isid_tsih = pImage->ISID << 16; /* TSIH field currently always 0 */
1266
1267	do {
1268	transit = false;
1269	cbBuf = 0;
1270	/* Handle all cases with a single switch statement. */
1271	switch (csg << 8 \| substate)
1272	{
1273	case 0x0000: /* security negotiation, step 0: propose authentication. */
1274	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "SessionType", "Normal", 0);
1275	if (RT_FAILURE(rc))
1276	goto out;
1277	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "InitiatorName", pImage->pszInitiatorName, 0);
1278	if (RT_FAILURE(rc))
1279	goto out;
1280	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "TargetName", pImage->pszTargetName, 0);
1281	if (RT_FAILURE(rc))
1282	goto out;
1283	if (pImage->pszInitiatorUsername == NULL)
1284	{
1285	/* No authentication. Immediately switch to next phase. */
1286	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "AuthMethod", "None", 0);
1287	if (RT_FAILURE(rc))
1288	goto out;
1289	nsg = 1;
1290	transit = true;
1291	}
1292	else
1293	{
1294	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "AuthMethod", "CHAP,None", 0);
1295	if (RT_FAILURE(rc))
1296	goto out;
1297	}
1298	break;
1299	case 0x0001: /* security negotiation, step 1: propose CHAP_MD5 variant. */
1300	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_A", "5", 0);
1301	if (RT_FAILURE(rc))
1302	goto out;
1303	break;
1304	case 0x0002: /* security negotiation, step 2: send authentication info. */
1305	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_N", pImage->pszInitiatorUsername, 0);
1306	if (RT_FAILURE(rc))
1307	goto out;
1308	chap_md5_compute_response(aResponse, bChapIdx, pbChallenge, cbChallenge,
1309	pImage->pbInitiatorSecret, pImage->cbInitiatorSecret);
1310	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf, "CHAP_R", (const char *)aResponse, RTMD5HASHSIZE);
1311	if (RT_FAILURE(rc))
1312	goto out;
1313	nsg = 1;
1314	transit = true;
1315	break;
1316	case 0x0100: /* login operational negotiation, step 0: set parameters. */
1317	if (fParameterNeg)
1318	{
1319	for (unsigned i = 0; i < RT_ELEMENTS(aParameterNeg); i++)
1320	{
1321	rc = iscsiTextAddKeyValue(bBuf, sizeof(bBuf), &cbBuf,
1322	aParameterNeg[i].pszParamName,
1323	aParameterNeg[i].pszParamValue,
1324	aParameterNeg[i].cbParamValue);
1325	if (RT_FAILURE(rc))
1326	goto out;
1327	}
1328	fParameterNeg = false;
1329	}
1330
1331	nsg = 3;
1332	transit = true;
1333	break;
1334	case 0x0300: /* full feature phase. */
1335	default:
1336	/* Should never come here. */
1337	AssertMsgFailed(("send: Undefined login state %d substate %d\n", csg, substate));
1338	break;
1339	}
1340
1341	aReqBHS[0] = RT_H2N_U32( ISCSI_IMMEDIATE_DELIVERY_BIT
1342	\| (csg << ISCSI_CSG_SHIFT)
1343	\| (transit ? (nsg << ISCSI_NSG_SHIFT \| ISCSI_TRANSIT_BIT) : 0)
1344	\| ISCSI_MY_VERSION /* Minimum version. */
1345	\| (ISCSI_MY_VERSION << 8) /* Maximum version. */
1346	\| ISCSIOP_LOGIN_REQ); /* C=0 */
1347	aReqBHS[1] = RT_H2N_U32((uint32_t)cbBuf); /* TotalAHSLength=0 */
1348	aReqBHS[2] = RT_H2N_U32(isid_tsih >> 32);
1349	aReqBHS[3] = RT_H2N_U32(isid_tsih & 0xffffffff);
1350	aReqBHS[4] = itt;
1351	aReqBHS[5] = RT_H2N_U32(1 << 16); /* CID=1,reserved */
1352	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1353	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1354	aReqBHS[8] = 0; /* reserved */
1355	aReqBHS[9] = 0; /* reserved */
1356	aReqBHS[10] = 0; /* reserved */
1357	aReqBHS[11] = 0; /* reserved */
1358
1359	cnISCSIReq = 0;
1360	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1361	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1362	cnISCSIReq++;
1363
1364	aISCSIReq[cnISCSIReq].pcvSeg = bBuf;
1365	aISCSIReq[cnISCSIReq].cbSeg = cbBuf;
1366	cnISCSIReq++;
1367
1368	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
1369	if (RT_SUCCESS(rc))
1370	{
1371	ISCSIOPCODE cmd;
1372	ISCSILOGINSTATUSCLASS loginStatusClass;
1373
1374	cnISCSIRes = 0;
1375	aISCSIRes[cnISCSIRes].pvSeg = aResBHS;
1376	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aResBHS);
1377	cnISCSIRes++;
1378	aISCSIRes[cnISCSIRes].pvSeg = bBuf;
1379	aISCSIRes[cnISCSIRes].cbSeg = sizeof(bBuf);
1380	cnISCSIRes++;
1381
1382	rc = iscsiRecvPDU(pImage, itt, aISCSIRes, cnISCSIRes);
1383	if (RT_FAILURE(rc))
1384	break;
1385	/** @todo collect partial login responses with Continue bit set. */
1386	Assert(aISCSIRes[0].pvSeg == aResBHS);
1387	Assert(aISCSIRes[0].cbSeg >= ISCSI_BHS_SIZE);
1388	Assert((RT_N2H_U32(aResBHS[0]) & ISCSI_CONTINUE_BIT) == 0);
1389
1390	cmd = (ISCSIOPCODE)(RT_N2H_U32(aResBHS[0]) & ISCSIOP_MASK);
1391	if (cmd == ISCSIOP_LOGIN_RES)
1392	{
1393	if ((RT_N2H_U32(aResBHS[0]) & 0xff) != ISCSI_MY_VERSION)
1394	{
1395	iscsiTransportClose(pImage);
1396	rc = VERR_PARSE_ERROR;
1397	break; /* Give up immediately, as a RFC violation in version fields is very serious. */
1398	}
1399
1400	loginStatusClass = (ISCSILOGINSTATUSCLASS)(RT_N2H_U32(aResBHS[9]) >> 24);
1401	switch (loginStatusClass)
1402	{
1403	case ISCSI_LOGIN_STATUS_CLASS_SUCCESS:
1404	uint32_t targetCSG;
1405	uint32_t targetNSG;
1406	bool targetTransit;
1407
1408	if (pImage->FirstRecvPDU)
1409	{
1410	pImage->FirstRecvPDU = false;
1411	pImage->ExpStatSN = RT_N2H_U32(aResBHS[6]) + 1;
1412	}
1413
1414	targetCSG = (RT_N2H_U32(aResBHS[0]) & ISCSI_CSG_MASK) >> ISCSI_CSG_SHIFT;
1415	targetNSG = (RT_N2H_U32(aResBHS[0]) & ISCSI_NSG_MASK) >> ISCSI_NSG_SHIFT;
1416	targetTransit = !!(RT_N2H_U32(aResBHS[0]) & ISCSI_TRANSIT_BIT);
1417
1418	/* Handle all cases with a single switch statement. */
1419	switch (csg << 8 \| substate)
1420	{
1421	case 0x0000: /* security negotiation, step 0: receive final authentication. */
1422	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1423	if (RT_FAILURE(rc))
1424	break;
1425
1426	const char *pcszAuthMethod;
1427
1428	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "AuthMethod", &pcszAuthMethod);
1429	if (RT_FAILURE(rc))
1430	{
1431	rc = VERR_PARSE_ERROR;
1432	break;
1433	}
1434	if (strcmp(pcszAuthMethod, "None") == 0)
1435	{
1436	/* Authentication offered, but none required. Skip to operational parameters. */
1437	csg = 1;
1438	nsg = 1;
1439	transit = true;
1440	substate = 0;
1441	break;
1442	}
1443	else if (strcmp(pcszAuthMethod, "CHAP") == 0 && targetNSG == 0 && !targetTransit)
1444	{
1445	/* CHAP authentication required, continue with next substate. */
1446	substate++;
1447	break;
1448	}
1449
1450	/* Unknown auth method or login response PDU headers incorrect. */
1451	rc = VERR_PARSE_ERROR;
1452	break;
1453	case 0x0001: /* security negotiation, step 1: receive final CHAP variant and challenge. */
1454	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1455	if (RT_FAILURE(rc))
1456	break;
1457
1458	const char *pcszChapAuthMethod;
1459	const char *pcszChapIdxTarget;
1460	const char *pcszChapChallengeStr;
1461
1462	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_A", &pcszChapAuthMethod);
1463	if (RT_FAILURE(rc))
1464	{
1465	rc = VERR_PARSE_ERROR;
1466	break;
1467	}
1468	if (strcmp(pcszChapAuthMethod, "5") != 0)
1469	{
1470	rc = VERR_PARSE_ERROR;
1471	break;
1472	}
1473	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_I", &pcszChapIdxTarget);
1474	if (RT_FAILURE(rc))
1475	{
1476	rc = VERR_PARSE_ERROR;
1477	break;
1478	}
1479	rc = RTStrToUInt8Ex(pcszChapIdxTarget, &pszNext, 0, &bChapIdx);
1480	if ((rc > VINF_SUCCESS) \|\| *pszNext != '\0')
1481	{
1482	rc = VERR_PARSE_ERROR;
1483	break;
1484	}
1485	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "CHAP_C", &pcszChapChallengeStr);
1486	if (RT_FAILURE(rc))
1487	{
1488	rc = VERR_PARSE_ERROR;
1489	break;
1490	}
1491	cbChallenge = sizeof(pbChallenge);
1492	rc = iscsiStrToBinary(pcszChapChallengeStr, pbChallenge, &cbChallenge);
1493	if (RT_FAILURE(rc))
1494	break;
1495	substate++;
1496	transit = true;
1497	break;
1498	case 0x0002: /* security negotiation, step 2: check authentication success. */
1499	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1500	if (RT_FAILURE(rc))
1501	break;
1502
1503	if (targetCSG == 0 && targetNSG == 1 && targetTransit)
1504	{
1505	/* Target wants to continue in login operational state, authentication success. */
1506	csg = 1;
1507	nsg = 3;
1508	substate = 0;
1509	break;
1510	}
1511	rc = VERR_PARSE_ERROR;
1512	break;
1513	case 0x0100: /* login operational negotiation, step 0: check results. */
1514	rc = iscsiUpdateParameters(pImage, bBuf, aISCSIRes[1].cbSeg);
1515	if (RT_FAILURE(rc))
1516	break;
1517
1518	if (targetCSG == 1 && targetNSG == 3 && targetTransit)
1519	{
1520	/* Target wants to continue in full feature phase, login finished. */
1521	csg = 3;
1522	nsg = 3;
1523	substate = 0;
1524	break;
1525	}
1526	else if (targetCSG == 1 && targetNSG == 1 && !targetTransit)
1527	{
1528	/* Target wants to negotiate certain parameters and
1529	* stay in login operational negotiation. */
1530	csg = 1;
1531	nsg = 3;
1532	substate = 0;
1533	}
1534	rc = VERR_PARSE_ERROR;
1535	break;
1536	case 0x0300: /* full feature phase. */
1537	default:
1538	AssertMsgFailed(("recv: Undefined login state %d substate %d\n", csg, substate));
1539	rc = VERR_PARSE_ERROR;
1540	break;
1541	}
1542	break;
1543	case ISCSI_LOGIN_STATUS_CLASS_REDIRECTION:
1544	const char *pcszTargetRedir;
1545
1546	/* Target has moved to some other location, as indicated in the TargetAddress key. */
1547	rc = iscsiTextGetKeyValue(bBuf, aISCSIRes[1].cbSeg, "TargetAddress", &pcszTargetRedir);
1548	if (RT_FAILURE(rc))
1549	{
1550	rc = VERR_PARSE_ERROR;
1551	break;
1552	}
1553	if (pImage->pszTargetAddress)
1554	RTMemFree(pImage->pszTargetAddress);
1555	{
1556	size_t cb = strlen(pcszTargetRedir) + 1;
1557	pImage->pszTargetAddress = (char *)RTMemAlloc(cb);
1558	if (!pImage->pszTargetAddress)
1559	{
1560	rc = VERR_NO_MEMORY;
1561	break;
1562	}
1563	memcpy(pImage->pszTargetAddress, pcszTargetRedir, cb);
1564	}
1565	rc = iscsiTransportOpen(pImage);
1566	goto restart;
1567	case ISCSI_LOGIN_STATUS_CLASS_INITIATOR_ERROR:
1568	iscsiTransportClose(pImage);
1569	rc = VERR_IO_GEN_FAILURE;
1570	goto out;
1571	case ISCSI_LOGIN_STATUS_CLASS_TARGET_ERROR:
1572	iscsiTransportClose(pImage);
1573	rc = VINF_EOF;
1574	break;
1575	default:
1576	rc = VERR_PARSE_ERROR;
1577	}
1578
1579	if (csg == 3)
1580	{
1581	/*
1582	* Finished login, continuing with Full Feature Phase.
1583	*/
1584	rc = VINF_SUCCESS;
1585	break;
1586	}
1587	}
1588	else
1589	{
1590	AssertMsgFailed(("%s: ignoring unexpected PDU with first word = %#08x\n", __FUNCTION__, RT_N2H_U32(aResBHS[0])));
1591	}
1592	}
1593	else
1594	break;
1595	} while (true);
1596
1597	out:
1598	if (RT_FAILURE(rc))
1599	{
1600	/*
1601	* Close connection to target.
1602	*/
1603	iscsiTransportClose(pImage);
1604	pImage->state = ISCSISTATE_FREE;
1605	}
1606	else
1607	pImage->state = ISCSISTATE_NORMAL;
1608
1609	RTSemMutexRelease(pImage->Mutex);
1610
1611	LogFlowFunc(("returning %Rrc\n", rc));
1612	LogRel(("iSCSI: login to target %s %s\n", pImage->pszTargetName, RT_SUCCESS(rc) ? "successful" : "failed"));
1613	return rc;
1614	}
1615
1616
1617	/**
1618	* Detach from an iSCSI target.
1619	*
1620	* @returns VBox status.
1621	* @param pImage The iSCSI connection state to be used.
1622	*/
1623	static int iscsiDetach(void *pvUser)
1624	{
1625	int rc;
1626	uint32_t itt;
1627	uint32_t cnISCSIReq = 0;
1628	ISCSIREQ aISCSIReq[4];
1629	uint32_t aReqBHS[12];
1630	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
1631
1632	LogFlowFunc(("entering\n"));
1633
1634	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1635
1636	if (pImage->state != ISCSISTATE_FREE && pImage->state != ISCSISTATE_IN_LOGOUT)
1637	{
1638	pImage->state = ISCSISTATE_IN_LOGOUT;
1639
1640	/*
1641	* Send logout request to target.
1642	*/
1643	itt = iscsiNewITT(pImage);
1644	aReqBHS[0] = RT_H2N_U32(ISCSI_FINAL_BIT \| ISCSIOP_LOGOUT_REQ); /* I=0,F=1,Reason=close session */
1645	aReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
1646	aReqBHS[2] = 0; /* reserved */
1647	aReqBHS[3] = 0; /* reserved */
1648	aReqBHS[4] = itt;
1649	aReqBHS[5] = 0; /* reserved */
1650	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1651	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1652	aReqBHS[8] = 0; /* reserved */
1653	aReqBHS[9] = 0; /* reserved */
1654	aReqBHS[10] = 0; /* reserved */
1655	aReqBHS[11] = 0; /* reserved */
1656	pImage->CmdSN++;
1657
1658	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1659	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1660	cnISCSIReq++;
1661
1662	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
1663	if (RT_SUCCESS(rc))
1664	{
1665	/*
1666	* Read logout response from target.
1667	*/
1668	ISCSIRES aISCSIRes;
1669	uint32_t aResBHS[12];
1670
1671	aISCSIRes.pvSeg = aResBHS;
1672	aISCSIRes.cbSeg = sizeof(aResBHS);
1673	rc = iscsiRecvPDU(pImage, itt, &aISCSIRes, 1);
1674	if (RT_SUCCESS(rc))
1675	{
1676	if (RT_N2H_U32(aResBHS[0]) != (ISCSI_FINAL_BIT \| ISCSIOP_LOGOUT_RES))
1677	AssertMsgFailed(("iSCSI Logout response invalid\n"));
1678	}
1679	else
1680	AssertMsgFailed(("iSCSI Logout response error, rc=%Rrc\n", rc));
1681	}
1682	else
1683	AssertMsgFailed(("Could not send iSCSI Logout request, rc=%Rrc\n", rc));
1684	}
1685
1686	if (pImage->state != ISCSISTATE_FREE)
1687	{
1688	/*
1689	* Close connection to target.
1690	*/
1691	rc = iscsiTransportClose(pImage);
1692	if (RT_FAILURE(rc))
1693	AssertMsgFailed(("Could not close connection to target, rc=%Rrc\n", rc));
1694	}
1695
1696	pImage->state = ISCSISTATE_FREE;
1697
1698	RTSemMutexRelease(pImage->Mutex);
1699
1700	LogFlowFunc(("leaving\n"));
1701	LogRel(("iSCSI: logout to target %s\n", pImage->pszTargetName));
1702	return VINF_SUCCESS;
1703	}
1704
1705
1706	/**
1707	* Perform a command on an iSCSI target. Target must be already in
1708	* Full Feature Phase.
1709	*
1710	* @returns VBOX status.
1711	* @param pImage The iSCSI connection state to be used.
1712	* @param pRequest Command descriptor. Contains all information about
1713	* the command, its transfer directions and pointers
1714	* to the buffer(s) used for transferring data and
1715	* status information.
1716	*/
1717	static int iscsiCommand(PISCSIIMAGE pImage, PSCSIREQ pRequest)
1718	{
1719	int rc;
1720	uint32_t itt;
1721	uint32_t cbData;
1722	uint32_t cnISCSIReq = 0;
1723	ISCSIREQ aISCSIReq[4];
1724	uint32_t aReqBHS[12];
1725
1726	uint32_t *pDst = NULL;
1727	size_t cbBufLength;
1728	uint32_t aStatus[256]; /*< Plenty of buffer for status information. /
1729	uint32_t ExpDataSN = 0;
1730	bool final = false;
1731
1732
1733	LogFlowFunc(("entering, CmdSN=%d\n", pImage->CmdSN));
1734
1735	Assert(pRequest->enmXfer != SCSIXFER_TO_FROM_TARGET); /*< @todo not yet supported, would require AHS. /
1736	Assert(pRequest->cbI2TData <= 0xffffff); /* larger transfers would require R2T support. */
1737	Assert(pRequest->cbCDB <= 16); /* would cause buffer overrun below. */
1738
1739	/* If not in normal state, then the transport connection was dropped. Try
1740	* to reestablish by logging in, the target might be responsive again. */
1741	if (pImage->state == ISCSISTATE_FREE)
1742	rc = iscsiAttach(pImage);
1743
1744	/* If still not in normal state, then the underlying transport connection
1745	* cannot be established. Get out before bad things happen (and make
1746	* sure the caller suspends the VM again). */
1747	if (pImage->state != ISCSISTATE_NORMAL)
1748	{
1749	rc = VERR_NET_CONNECTION_REFUSED;
1750	goto out;
1751	}
1752
1753	/*
1754	* Send SCSI command to target with all I2T data included.
1755	*/
1756	cbData = 0;
1757	if (pRequest->enmXfer == SCSIXFER_FROM_TARGET)
1758	cbData = (uint32_t)pRequest->cbT2IData;
1759	else
1760	cbData = (uint32_t)pRequest->cbI2TData;
1761
1762	RTSemMutexRequest(pImage->Mutex, RT_INDEFINITE_WAIT);
1763
1764	itt = iscsiNewITT(pImage);
1765	memset(aReqBHS, 0, sizeof(aReqBHS));
1766	aReqBHS[0] = RT_H2N_U32( ISCSI_FINAL_BIT \| ISCSI_TASK_ATTR_SIMPLE \| ISCSIOP_SCSI_CMD
1767	\| (pRequest->enmXfer << 21)); /* I=0,F=1,Attr=Simple */
1768	aReqBHS[1] = RT_H2N_U32(0x00000000 \| ((uint32_t)pRequest->cbI2TData & 0xffffff)); /* TotalAHSLength=0 */
1769	aReqBHS[2] = RT_H2N_U32(pImage->LUN >> 32);
1770	aReqBHS[3] = RT_H2N_U32(pImage->LUN & 0xffffffff);
1771	aReqBHS[4] = itt;
1772	aReqBHS[5] = RT_H2N_U32(cbData);
1773	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
1774	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
1775	memcpy(aReqBHS + 8, pRequest->pvCDB, pRequest->cbCDB);
1776	pImage->CmdSN++;
1777
1778	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
1779	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
1780	cnISCSIReq++;
1781
1782	if ( pRequest->enmXfer == SCSIXFER_TO_TARGET
1783	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET)
1784	{
1785	Assert(pRequest->cI2TSegs == 1);
1786	aISCSIReq[cnISCSIReq].pcvSeg = pRequest->paI2TSegs[0].pvSeg;
1787	aISCSIReq[cnISCSIReq].cbSeg = pRequest->paI2TSegs[0].cbSeg; /* Padding done by transport. */
1788	cnISCSIReq++;
1789	}
1790
1791	rc = iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_DEFAULT);
1792	if (RT_FAILURE(rc))
1793	goto out_release;
1794
1795	/* Place SCSI request in queue. */
1796	pImage->paCurrReq = aISCSIReq;
1797	pImage->cnCurrReq = cnISCSIReq;
1798
1799	/*
1800	* Read SCSI response/data in PDUs from target.
1801	*/
1802	if ( pRequest->enmXfer == SCSIXFER_FROM_TARGET
1803	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET)
1804	{
1805	Assert(pRequest->cT2ISegs == 1);
1806	pDst = (uint32_t *)pRequest->paT2ISegs[0].pvSeg;
1807	cbBufLength = pRequest->paT2ISegs[0].cbSeg;
1808	}
1809	else
1810	cbBufLength = 0;
1811
1812	do {
1813	uint32_t cnISCSIRes = 0;
1814	ISCSIRES aISCSIRes[4];
1815	uint32_t aResBHS[12];
1816
1817	aISCSIRes[cnISCSIRes].pvSeg = aResBHS;
1818	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aResBHS);
1819	cnISCSIRes++;
1820	if (cbBufLength != 0 &&
1821	( pRequest->enmXfer == SCSIXFER_FROM_TARGET
1822	\|\| pRequest->enmXfer == SCSIXFER_TO_FROM_TARGET))
1823	{
1824	aISCSIRes[cnISCSIRes].pvSeg = pDst;
1825	aISCSIRes[cnISCSIRes].cbSeg = cbBufLength;
1826	cnISCSIRes++;
1827	}
1828	/* Always reserve space for the status - it's impossible to tell
1829	* beforehand whether this will be the final PDU or not. */
1830	aISCSIRes[cnISCSIRes].pvSeg = aStatus;
1831	aISCSIRes[cnISCSIRes].cbSeg = sizeof(aStatus);
1832	cnISCSIRes++;
1833
1834	rc = iscsiRecvPDU(pImage, itt, aISCSIRes, cnISCSIRes);
1835	if (RT_FAILURE(rc))
1836	break;
1837
1838	final = !!(RT_N2H_U32(aResBHS[0]) & ISCSI_FINAL_BIT);
1839	ISCSIOPCODE cmd = (ISCSIOPCODE)(RT_N2H_U32(aResBHS[0]) & ISCSIOP_MASK);
1840	if (cmd == ISCSIOP_SCSI_RES)
1841	{
1842	/* This is the final PDU which delivers the status (and may be omitted if
1843	* the last Data-In PDU included successful completion status). Note
1844	* that ExpStatSN has been bumped already in iscsiRecvPDU. */
1845	if (!final \|\| ((RT_N2H_U32(aResBHS[0]) & 0x0000ff00) != 0) \|\| (RT_N2H_U32(aResBHS[6]) != pImage->ExpStatSN - 1))
1846	{
1847	/* SCSI Response in the wrong place or with a (target) failure. */
1848	rc = VERR_PARSE_ERROR;
1849	break;
1850	}
1851	/* The following is a bit tricky, as in error situations we may
1852	* get the status only instead of the result data plus optional
1853	* status. Thus the status may have ended up partially in the
1854	* data area. */
1855	pRequest->status = RT_N2H_U32(aResBHS[0]) & 0x000000ff;
1856	cbData = RT_N2H_U32(aResBHS[1]) & 0x00ffffff;
1857	if (cbData >= 2)
1858	{
1859	uint32_t cbStat = RT_N2H_U32(((uint32_t *)aISCSIRes[1].pvSeg)[0]) >> 16;
1860	if (cbStat + 2 > cbData)
1861	{
1862	rc = VERR_BUFFER_OVERFLOW;
1863	break;
1864	}
1865	/* Truncate sense data if it doesn't fit into the buffer. */
1866	pRequest->cbSense = RT_MIN(cbStat, pRequest->cbSense);
1867	memcpy(pRequest->pvSense,
1868	((const char *)aISCSIRes[1].pvSeg) + 2,
1869	RT_MIN(aISCSIRes[1].cbSeg - 2, pRequest->cbSense));
1870	if ( cnISCSIRes > 2 && aISCSIRes[2].cbSeg
1871	&& (ssize_t)pRequest->cbSense - aISCSIRes[1].cbSeg + 2 > 0)
1872	{
1873	memcpy((char *)pRequest->pvSense + aISCSIRes[1].cbSeg - 2,
1874	aISCSIRes[2].pvSeg,
1875	pRequest->cbSense - aISCSIRes[1].cbSeg + 2);
1876	}
1877	}
1878	else if (cbData == 1)
1879	{
1880	rc = VERR_PARSE_ERROR;
1881	break;
1882	}
1883	else
1884	pRequest->cbSense = 0;
1885	break;
1886	}
1887	else if (cmd == ISCSIOP_SCSI_DATA_IN)
1888	{
1889	/* A Data-In PDU carries some data that needs to be added to the received
1890	* data in response to the command. There may be both partial and complete
1891	* Data-In PDUs, so collect data until the status is included or the status
1892	* is sent in a separate SCSI Result frame (see above). */
1893	if (final && aISCSIRes[2].cbSeg != 0)
1894	{
1895	/* The received PDU is partially stored in the buffer for status.
1896	* Must not happen under normal circumstances and is a target error. */
1897	rc = VERR_BUFFER_OVERFLOW;
1898	break;
1899	}
1900	uint32_t len = RT_N2H_U32(aResBHS[1]) & 0x00ffffff;
1901	pDst = (uint32_t )((char )pDst + len);
1902	cbBufLength -= len;
1903	ExpDataSN++;
1904	if (final && (RT_N2H_U32(aResBHS[0]) & ISCSI_STATUS_BIT) != 0)
1905	{
1906	pRequest->status = RT_N2H_U32(aResBHS[0]) & 0x000000ff;
1907	pRequest->cbSense = 0;
1908	break;
1909	}
1910	}
1911	else
1912	{
1913	rc = VERR_PARSE_ERROR;
1914	break;
1915	}
1916	} while (true);
1917
1918	/* Remove SCSI request from queue. */
1919	pImage->paCurrReq = NULL;
1920	pImage->cnCurrReq = 0;
1921
1922	out_release:
1923	if (rc == VERR_TIMEOUT)
1924	{
1925	/* Drop connection in case the target plays dead. Much better than
1926	* delaying the next requests until the timed out command actually
1927	* finishes. Also keep in mind that command shouldn't take longer than
1928	* about 30-40 seconds, or the guest will lose its patience. */
1929	iscsiTransportClose(pImage);
1930	pImage->state = ISCSISTATE_FREE;
1931	rc = VERR_BROKEN_PIPE;
1932	}
1933	RTSemMutexRelease(pImage->Mutex);
1934
1935	out:
1936	LogFlowFunc(("returns %Rrc\n", rc));
1937	return rc;
1938	}
1939
1940
1941	/**
1942	* Generate a new Initiator Task Tag.
1943	*
1944	* @returns Initiator Task Tag.
1945	* @param pImage The iSCSI connection state to be used.
1946	*/
1947	static uint32_t iscsiNewITT(PISCSIIMAGE pImage)
1948	{
1949	uint32_t next_itt;
1950
1951	next_itt = pImage->ITT++;
1952	if (pImage->ITT == ISCSI_TASK_TAG_RSVD)
1953	pImage->ITT = 0;
1954	return RT_H2N_U32(next_itt);
1955	}
1956
1957
1958	/**
1959	* Send an iSCSI request. The request can consist of several segments, which
1960	* are padded to 4 byte boundaries and concatenated.
1961	*
1962	* @returns VBOX status
1963	* @param pImage The iSCSI connection state to be used.
1964	* @param paReq Pointer to array of iSCSI request sections.
1965	* @param cnReq Number of valid iSCSI request sections in the array.
1966	* @param uFlags Flags controlling the exact send semantics.
1967	*/
1968	static int iscsiSendPDU(PISCSIIMAGE pImage, PISCSIREQ paReq, uint32_t cnReq,
1969	uint32_t uFlags)
1970	{
1971	int rc = VINF_SUCCESS;
1972	/** @todo return VERR_VD_ISCSI_INVALID_STATE in the appropriate situations,
1973	* needs cleaning up of timeout/disconnect handling a bit, as otherwise
1974	* too many incorrect errors are signalled. */
1975	Assert(cnReq >= 1);
1976	Assert(paReq[0].cbSeg >= ISCSI_BHS_SIZE);
1977
1978	for (uint32_t i = 0; i < pImage->cISCSIRetries; i++)
1979	{
1980	rc = iscsiTransportWrite(pImage, paReq, cnReq);
1981	if (RT_SUCCESS(rc))
1982	break;
1983	if ( (uFlags & ISCSIPDU_NO_REATTACH)
1984	\|\| (rc != VERR_BROKEN_PIPE && rc != VERR_NET_CONNECTION_REFUSED))
1985	break;
1986	/* No point in reestablishing the connection for a logout */
1987	if (pImage->state == ISCSISTATE_IN_LOGOUT)
1988	break;
1989	RTThreadSleep(500);
1990	if (pImage->state != ISCSISTATE_IN_LOGIN)
1991	{
1992	/* Attempt to re-login when a connection fails, but only when not
1993	* currently logging in. */
1994	rc = iscsiAttach(pImage);
1995	if (RT_FAILURE(rc))
1996	break;
1997	}
1998	}
1999	return rc;
2000	}
2001
2002
2003	/**
2004	* Wait for an iSCSI response with a matching Initiator Target Tag. The response is
2005	* split into several segments, as requested by the caller-provided buffer specification.
2006	* Remember that the response can be split into several PDUs by the sender, so make
2007	* sure that all parts are collected and processed appropriately by the caller.
2008	*
2009	* @returns VBOX status
2010	* @param pImage The iSCSI connection state to be used.
2011	* @param paRes Pointer to array of iSCSI response sections.
2012	* @param cnRes Number of valid iSCSI response sections in the array.
2013	*/
2014	static int iscsiRecvPDU(PISCSIIMAGE pImage, uint32_t itt, PISCSIRES paRes, uint32_t cnRes)
2015	{
2016	int rc = VINF_SUCCESS;
2017	ISCSIRES aResBuf;
2018
2019	for (uint32_t i = 0; i < pImage->cISCSIRetries; i++)
2020	{
2021	aResBuf.pvSeg = pImage->pvRecvPDUBuf;
2022	aResBuf.cbSeg = pImage->cbRecvPDUBuf;
2023	rc = iscsiTransportRead(pImage, &aResBuf, 1);
2024	if (RT_FAILURE(rc))
2025	{
2026	if (rc == VERR_BROKEN_PIPE \|\| rc == VERR_NET_CONNECTION_REFUSED)
2027	{
2028	/* No point in reestablishing the connection for a logout */
2029	if (pImage->state == ISCSISTATE_IN_LOGOUT)
2030	break;
2031	/* Connection broken while waiting for a response - wait a while and
2032	* try to restart by re-sending the original request (if any).
2033	* This also handles the connection reestablishment (login etc.). */
2034	RTThreadSleep(500);
2035	if (pImage->state != ISCSISTATE_IN_LOGIN)
2036	{
2037	/* Attempt to re-login when a connection fails, but only when not
2038	* currently logging in. */
2039	rc = iscsiAttach(pImage);
2040	if (RT_FAILURE(rc))
2041	break;
2042	}
2043	if (pImage->paCurrReq != NULL)
2044	{
2045	rc = iscsiSendPDU(pImage, pImage->paCurrReq, pImage->cnCurrReq, ISCSIPDU_DEFAULT);
2046	if (RT_FAILURE(rc))
2047	break;
2048	}
2049	}
2050	else
2051	{
2052	/* Signal other errors (VERR_BUFFER_OVERFLOW etc.) to the caller. */
2053	break;
2054	}
2055	}
2056	else
2057	{
2058	ISCSIOPCODE cmd;
2059	const uint32_t pcvResSeg = (const uint32_t )aResBuf.pvSeg;
2060
2061	/* Check whether the received PDU is valid, and update the internal state of
2062	* the iSCSI connection/session. */
2063	rc = iscsiValidatePDU(&aResBuf, 1);
2064	if (RT_FAILURE(rc))
2065	continue;
2066	cmd = (ISCSIOPCODE)(RT_N2H_U32(pcvResSeg[0]) & ISCSIOP_MASK);
2067	switch (cmd)
2068	{
2069	case ISCSIOP_SCSI_RES:
2070	case ISCSIOP_SCSI_TASKMGMT_RES:
2071	case ISCSIOP_SCSI_DATA_IN:
2072	case ISCSIOP_R2T:
2073	case ISCSIOP_ASYN_MSG:
2074	case ISCSIOP_TEXT_RES:
2075	case ISCSIOP_LOGIN_RES:
2076	case ISCSIOP_LOGOUT_RES:
2077	case ISCSIOP_REJECT:
2078	case ISCSIOP_NOP_IN:
2079	if (serial_number_less(pImage->MaxCmdSN, RT_N2H_U32(pcvResSeg[8])))
2080	pImage->MaxCmdSN = RT_N2H_U32(pcvResSeg[8]);
2081	if (serial_number_less(pImage->ExpCmdSN, RT_N2H_U32(pcvResSeg[7])))
2082	pImage->ExpCmdSN = RT_N2H_U32(pcvResSeg[7]);
2083	break;
2084	default:
2085	rc = VERR_PARSE_ERROR;
2086	}
2087	if (RT_FAILURE(rc))
2088	continue;
2089	if ( !pImage->FirstRecvPDU
2090	&& (cmd != ISCSIOP_SCSI_DATA_IN \|\| (RT_N2H_U32(pcvResSeg[0]) & ISCSI_STATUS_BIT))
2091	&& ( cmd != ISCSIOP_LOGIN_RES
2092	\|\| (ISCSILOGINSTATUSCLASS)((RT_N2H_U32(pcvResSeg[9]) >> 24) == ISCSI_LOGIN_STATUS_CLASS_SUCCESS)))
2093	{
2094	if (pImage->ExpStatSN == RT_N2H_U32(pcvResSeg[6]))
2095	{
2096	/* StatSN counter is not advanced on R2T and on a target SN update NOP-In. */
2097	if ( (cmd != ISCSIOP_R2T)
2098	&& ((cmd != ISCSIOP_NOP_IN) \|\| (RT_N2H_U32(pcvResSeg[4]) != ISCSI_TASK_TAG_RSVD)))
2099	pImage->ExpStatSN++;
2100	}
2101	else
2102	{
2103	rc = VERR_PARSE_ERROR;
2104	continue;
2105	}
2106	}
2107	/* Finally check whether the received PDU matches what the caller wants. */
2108	if ( itt == pcvResSeg[4]
2109	&& itt != ISCSI_TASK_TAG_RSVD)
2110	{
2111	/* Copy received PDU (one segment) to caller-provided buffers. */
2112	uint32_t j;
2113	size_t cbSeg;
2114	const uint8_t *pSrc;
2115
2116	pSrc = (const uint8_t *)aResBuf.pvSeg;
2117	cbSeg = aResBuf.cbSeg;
2118	for (j = 0; j < cnRes; j++)
2119	{
2120	if (cbSeg > paRes[j].cbSeg)
2121	{
2122	memcpy(paRes[j].pvSeg, pSrc, paRes[j].cbSeg);
2123	pSrc += paRes[j].cbSeg;
2124	cbSeg -= paRes[j].cbSeg;
2125	}
2126	else
2127	{
2128	memcpy(paRes[j].pvSeg, pSrc, cbSeg);
2129	paRes[j].cbSeg = cbSeg;
2130	cbSeg = 0;
2131	break;
2132	}
2133	}
2134	if (cbSeg != 0)
2135	{
2136	rc = VERR_BUFFER_OVERFLOW;
2137	break;
2138	}
2139	for (j++; j < cnRes; j++)
2140	paRes[j].cbSeg = 0;
2141	break;
2142	}
2143	else if ( cmd == ISCSIOP_NOP_IN
2144	&& RT_N2H_U32(pcvResSeg[5]) != ISCSI_TASK_TAG_RSVD)
2145	{
2146	uint32_t cnISCSIReq;
2147	ISCSIREQ aISCSIReq[4];
2148	uint32_t aReqBHS[12];
2149
2150	aReqBHS[0] = RT_H2N_U32(ISCSI_IMMEDIATE_DELIVERY_BIT \| ISCSI_FINAL_BIT \| ISCSIOP_NOP_OUT);
2151	aReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
2152	aReqBHS[2] = pcvResSeg[2]; /* copy LUN from NOP-In */
2153	aReqBHS[3] = pcvResSeg[3]; /* copy LUN from NOP-In */
2154	aReqBHS[4] = RT_H2N_U32(ISCSI_TASK_TAG_RSVD); /* ITT, reply */
2155	aReqBHS[5] = pcvResSeg[5]; /* copy TTT from NOP-In */
2156	aReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2157	aReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2158	aReqBHS[8] = 0; /* reserved */
2159	aReqBHS[9] = 0; /* reserved */
2160	aReqBHS[10] = 0; /* reserved */
2161	aReqBHS[11] = 0; /* reserved */
2162
2163	cnISCSIReq = 0;
2164	aISCSIReq[cnISCSIReq].pcvSeg = aReqBHS;
2165	aISCSIReq[cnISCSIReq].cbSeg = sizeof(aReqBHS);
2166	cnISCSIReq++;
2167
2168	iscsiSendPDU(pImage, aISCSIReq, cnISCSIReq, ISCSIPDU_NO_REATTACH);
2169	/* Break if the caller wanted to process the NOP-in only. */
2170	if (itt == ISCSI_TASK_TAG_RSVD)
2171	break;
2172	}
2173	}
2174	}
2175
2176	LogFlowFunc(("returns rc=%Rrc\n"));
2177	return rc;
2178	}
2179
2180
2181	/**
2182	* Reset the PDU buffer
2183	*
2184	* @param pImage The iSCSI connection state to be used.
2185	*/
2186	static void iscsiRecvPDUReset(PISCSIIMAGE pImage)
2187	{
2188	pImage->cbRecvPDUResidual = ISCSI_BHS_SIZE;
2189	pImage->fRecvPDUBHS = true;
2190	pImage->pbRecvPDUBufCur = (uint8_t *)pImage->pvRecvPDUBuf;
2191	}
2192
2193	static void iscsiPDUTxAdd(PISCSIIMAGE pImage, PISCSIPDUTX pIScsiPDUTx, bool fFront)
2194	{
2195	if (!fFront)
2196	{
2197	/* Insert PDU at the tail of the list. */
2198	if (!pImage->pIScsiPDUTxHead)
2199	pImage->pIScsiPDUTxHead = pIScsiPDUTx;
2200	else
2201	pImage->pIScsiPDUTxTail->pNext = pIScsiPDUTx;
2202	pImage->pIScsiPDUTxTail = pIScsiPDUTx;
2203	}
2204	else
2205	{
2206	/* Insert PDU at the beginning of the list. */
2207	pIScsiPDUTx->pNext = pImage->pIScsiPDUTxHead;
2208	pImage->pIScsiPDUTxHead = pIScsiPDUTx;
2209	if (!pImage->pIScsiPDUTxTail)
2210	pImage->pIScsiPDUTxTail = pIScsiPDUTx;
2211	}
2212	}
2213
2214	/**
2215	* Receives a PDU in a non blocking way.
2216	*
2217	* @returns VBOX status code.
2218	* @param pImage The iSCSI connection state to be used.
2219	*/
2220	static int iscsiRecvPDUAsync(PISCSIIMAGE pImage)
2221	{
2222	size_t cbActuallyRead = 0;
2223	int rc = VINF_SUCCESS;
2224
2225	LogFlowFunc(("pImage=%#p\n", pImage));
2226
2227	/* Check if we are in the middle of a PDU receive. */
2228	if (pImage->cbRecvPDUResidual == 0)
2229	{
2230	/*
2231	* We are receiving a new PDU, don't read more than the BHS initially
2232	* until we know the real size of the PDU.
2233	*/
2234	iscsiRecvPDUReset(pImage);
2235	LogFlow(("Receiving new PDU\n"));
2236	}
2237
2238	rc = pImage->pIfNet->pfnReadNB(pImage->Socket, pImage->pbRecvPDUBufCur,
2239	pImage->cbRecvPDUResidual, &cbActuallyRead);
2240	if (RT_SUCCESS(rc) && cbActuallyRead == 0)
2241	rc = VERR_BROKEN_PIPE;
2242
2243	if (RT_SUCCESS(rc))
2244	{
2245	LogFlow(("Received %zu bytes\n", cbActuallyRead));
2246	pImage->cbRecvPDUResidual -= cbActuallyRead;
2247	pImage->pbRecvPDUBufCur += cbActuallyRead;
2248
2249	/* Check if we received everything we wanted. */
2250	if ( !pImage->cbRecvPDUResidual
2251	&& pImage->fRecvPDUBHS)
2252	{
2253	size_t cbAHSLength, cbDataLength;
2254
2255	/* If we were reading the BHS first get the actual PDU size now. */
2256	uint32_t word1 = RT_N2H_U32(((uint32_t *)(pImage->pvRecvPDUBuf))[1]);
2257	cbAHSLength = (word1 & 0xff000000) >> 24;
2258	cbAHSLength = ((cbAHSLength - 1) \| 3) + 1; /* Add padding. */
2259	cbDataLength = word1 & 0x00ffffff;
2260	cbDataLength = ((cbDataLength - 1) \| 3) + 1; /* Add padding. */
2261	pImage->cbRecvPDUResidual = cbAHSLength + cbDataLength;
2262	pImage->fRecvPDUBHS = false; /* Start receiving the rest of the PDU. */
2263	}
2264
2265	if (!pImage->cbRecvPDUResidual)
2266	{
2267	/* We received the complete PDU with or without any payload now. */
2268	LogFlow(("Received complete PDU\n"));
2269	ISCSIRES aResBuf;
2270	aResBuf.pvSeg = pImage->pvRecvPDUBuf;
2271	aResBuf.cbSeg = pImage->cbRecvPDUBuf;
2272	rc = iscsiRecvPDUProcess(pImage, &aResBuf, 1);
2273	}
2274	}
2275	else
2276	LogFlowFunc(("Reading from the socket returned with rc=%Rrc\n", rc));
2277
2278	return rc;
2279	}
2280
2281	static int iscsiSendPDUAsync(PISCSIIMAGE pImage)
2282	{
2283	size_t cbSent = 0;
2284	int rc = VINF_SUCCESS;
2285
2286	LogFlowFunc(("pImage=%#p\n", pImage));
2287
2288	do
2289	{
2290	/*
2291	* If there is no PDU active, get the first one from the list.
2292	* Check that we are allowed to transfer the PDU by comparing the
2293	* command sequence number and the maximum sequence number allowed by the target.
2294	*/
2295	if (!pImage->pIScsiPDUTxCur)
2296	{
2297	if ( !pImage->pIScsiPDUTxHead
2298	\|\| serial_number_greater(pImage->pIScsiPDUTxHead->CmdSN, pImage->MaxCmdSN))
2299	break;
2300
2301	pImage->pIScsiPDUTxCur = pImage->pIScsiPDUTxHead;
2302	pImage->pIScsiPDUTxHead = pImage->pIScsiPDUTxCur->pNext;
2303	if (!pImage->pIScsiPDUTxHead)
2304	pImage->pIScsiPDUTxTail = NULL;
2305	}
2306
2307	/* Send as much as we can. */
2308	rc = pImage->pIfNet->pfnSgWriteNB(pImage->Socket, &pImage->pIScsiPDUTxCur->SgBuf, &cbSent);
2309	LogFlow(("SgWriteNB returned rc=%Rrc cbSent=%zu\n", rc, cbSent));
2310	if (RT_SUCCESS(rc))
2311	{
2312	LogFlow(("Sent %zu bytes for PDU %#p\n", cbSent, pImage->pIScsiPDUTxCur));
2313	pImage->pIScsiPDUTxCur->cbSgLeft -= cbSent;
2314	RTSgBufAdvance(&pImage->pIScsiPDUTxCur->SgBuf, cbSent);
2315	if (!pImage->pIScsiPDUTxCur->cbSgLeft)
2316	{
2317	/* PDU completed, free it and place the command on the waiting for response list. */
2318	if (pImage->pIScsiPDUTxCur->pIScsiCmd)
2319	{
2320	LogFlow(("Sent complete PDU, placing on waiting list\n"));
2321	iscsiCmdInsert(pImage, pImage->pIScsiPDUTxCur->pIScsiCmd);
2322	}
2323	RTMemFree(pImage->pIScsiPDUTxCur);
2324	pImage->pIScsiPDUTxCur = NULL;
2325	}
2326	}
2327	} while ( RT_SUCCESS(rc)
2328	&& !pImage->pIScsiPDUTxCur);
2329
2330	if (rc == VERR_TRY_AGAIN)
2331	rc = VINF_SUCCESS;
2332
2333	/* Add the write poll flag if we still have something to send, clear it otherwise. */
2334	if (pImage->pIScsiPDUTxCur)
2335	pImage->fPollEvents \|= VD_INTERFACETCPNET_EVT_WRITE;
2336	else
2337	pImage->fPollEvents &= ~VD_INTERFACETCPNET_EVT_WRITE;
2338
2339	LogFlowFunc(("rc=%Rrc pIScsiPDUTxCur=%#p\n", rc, pImage->pIScsiPDUTxCur));
2340	return rc;
2341	}
2342
2343	/**
2344	* Process a received PDU.
2345	*
2346	* @return VBOX status code.
2347	* @param pImage The iSCSI connection state to be used.
2348	* @param paRes Pointer to the array of iSCSI response sections.
2349	* @param cnRes Number of valid iSCSI response sections in the array.
2350	*/
2351	static int iscsiRecvPDUProcess(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes)
2352	{
2353	int rc = VINF_SUCCESS;
2354
2355	LogFlowFunc(("pImage=%#p paRes=%#p cnRes=%u\n", pImage, paRes, cnRes));
2356
2357	/* Validate the PDU first. */
2358	rc = iscsiValidatePDU(paRes, cnRes);
2359	if (RT_SUCCESS(rc))
2360	{
2361	ISCSIOPCODE cmd;
2362	const uint32_t pcvResSeg = (const uint32_t )paRes[0].pvSeg;
2363
2364	Assert(paRes[0].cbSeg > 9 * sizeof(uint32_t));
2365
2366	do
2367	{
2368	cmd = (ISCSIOPCODE)(RT_N2H_U32(pcvResSeg[0]) & ISCSIOP_MASK);
2369	switch (cmd)
2370	{
2371	case ISCSIOP_SCSI_RES:
2372	case ISCSIOP_SCSI_TASKMGMT_RES:
2373	case ISCSIOP_SCSI_DATA_IN:
2374	case ISCSIOP_R2T:
2375	case ISCSIOP_ASYN_MSG:
2376	case ISCSIOP_TEXT_RES:
2377	case ISCSIOP_LOGIN_RES:
2378	case ISCSIOP_LOGOUT_RES:
2379	case ISCSIOP_REJECT:
2380	case ISCSIOP_NOP_IN:
2381	if (serial_number_less(pImage->MaxCmdSN, RT_N2H_U32(pcvResSeg[8])))
2382	pImage->MaxCmdSN = RT_N2H_U32(pcvResSeg[8]);
2383	if (serial_number_less(pImage->ExpCmdSN, RT_N2H_U32(pcvResSeg[7])))
2384	pImage->ExpCmdSN = RT_N2H_U32(pcvResSeg[7]);
2385	break;
2386	default:
2387	rc = VERR_PARSE_ERROR;
2388	}
2389
2390	if (RT_FAILURE(rc))
2391	break;
2392
2393	if ( !pImage->FirstRecvPDU
2394	&& (cmd != ISCSIOP_SCSI_DATA_IN \|\| (RT_N2H_U32(pcvResSeg[0]) & ISCSI_STATUS_BIT)))
2395	{
2396	if (pImage->ExpStatSN == RT_N2H_U32(pcvResSeg[6]))
2397	{
2398	/* StatSN counter is not advanced on R2T and on a target SN update NOP-In. */
2399	if ( (cmd != ISCSIOP_R2T)
2400	&& ((cmd != ISCSIOP_NOP_IN) \|\| (RT_N2H_U32(pcvResSeg[4]) != ISCSI_TASK_TAG_RSVD)))
2401	pImage->ExpStatSN++;
2402	}
2403	else
2404	{
2405	rc = VERR_PARSE_ERROR;
2406	break;
2407	}
2408	}
2409
2410	if (pcvResSeg[4] != ISCSI_TASK_TAG_RSVD)
2411	{
2412	/*
2413	* This is a response from the target for a request from the initiator.
2414	* Get the request and update its state.
2415	*/
2416	rc = iscsiRecvPDUUpdateRequest(pImage, paRes, cnRes);
2417	/* Try to send more PDUs now that we updated the MaxCmdSN field */
2418	if ( RT_SUCCESS(rc)
2419	&& !pImage->pIScsiPDUTxCur)
2420	rc = iscsiSendPDUAsync(pImage);
2421	}
2422	else
2423	{
2424	/* This is a target initiated request (we handle only NOP-In request at the moment). */
2425	if ( cmd == ISCSIOP_NOP_IN
2426	&& RT_N2H_U32(pcvResSeg[5]) != ISCSI_TASK_TAG_RSVD)
2427	{
2428	PISCSIPDUTX pIScsiPDUTx;
2429	uint32_t cnISCSIReq;
2430	uint32_t *paReqBHS;
2431
2432	LogFlowFunc(("Sending NOP-Out\n"));
2433
2434	/* Allocate a new PDU initialize it and put onto the waiting list. */
2435	pIScsiPDUTx = (PISCSIPDUTX)RTMemAllocZ(sizeof(ISCSIPDUTX));
2436	if (!pIScsiPDUTx)
2437	{
2438	rc = VERR_NO_MEMORY;
2439	break;
2440	}
2441	paReqBHS = &pIScsiPDUTx->aBHS[0];
2442	paReqBHS[0] = RT_H2N_U32(ISCSI_IMMEDIATE_DELIVERY_BIT \| ISCSI_FINAL_BIT \| ISCSIOP_NOP_OUT);
2443	paReqBHS[1] = RT_H2N_U32(0); /* TotalAHSLength=0,DataSementLength=0 */
2444	paReqBHS[2] = pcvResSeg[2]; /* copy LUN from NOP-In */
2445	paReqBHS[3] = pcvResSeg[3]; /* copy LUN from NOP-In */
2446	paReqBHS[4] = RT_H2N_U32(ISCSI_TASK_TAG_RSVD); /* ITT, reply */
2447	paReqBHS[5] = pcvResSeg[5]; /* copy TTT from NOP-In */
2448	paReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2449	paReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2450	paReqBHS[8] = 0; /* reserved */
2451	paReqBHS[9] = 0; /* reserved */
2452	paReqBHS[10] = 0; /* reserved */
2453	paReqBHS[11] = 0; /* reserved */
2454
2455	cnISCSIReq = 0;
2456	pIScsiPDUTx->aISCSIReq[cnISCSIReq].pvSeg = paReqBHS;
2457	pIScsiPDUTx->aISCSIReq[cnISCSIReq].cbSeg = sizeof(pIScsiPDUTx->aBHS);
2458	cnISCSIReq++;
2459	pIScsiPDUTx->cbSgLeft = sizeof(pIScsiPDUTx->aBHS);
2460	RTSgBufInit(&pIScsiPDUTx->SgBuf, pIScsiPDUTx->aISCSIReq, cnISCSIReq);
2461
2462	/*
2463	* Link the PDU to the list.
2464	* Insert at the front of the list to send the response as soon as possible
2465	* to avoid frequent reconnects for a slow connection when there are many PDUs
2466	* waiting.
2467	*/
2468	iscsiPDUTxAdd(pImage, pIScsiPDUTx, true /* fFront */);
2469
2470	/* Start transfer of a PDU if there is no one active at the moment. */
2471	if (!pImage->pIScsiPDUTxCur)
2472	rc = iscsiSendPDUAsync(pImage);
2473	}
2474	}
2475	} while (0);
2476	}
2477
2478	return rc;
2479	}
2480
2481	/**
2482	* Check the static (not dependent on the connection/session state) validity of an iSCSI response PDU.
2483	*
2484	* @returns VBOX status
2485	* @param paRes Pointer to array of iSCSI response sections.
2486	* @param cnRes Number of valid iSCSI response sections in the array.
2487	*/
2488	static int iscsiValidatePDU(PISCSIRES paRes, uint32_t cnRes)
2489	{
2490	const uint32_t *pcrgResBHS;
2491	uint32_t hw0;
2492	Assert(cnRes >= 1);
2493	Assert(paRes[0].cbSeg >= ISCSI_BHS_SIZE);
2494
2495	LogFlowFunc(("paRes=%#p cnRes=%u\n", paRes, cnRes));
2496
2497	pcrgResBHS = (const uint32_t *)(paRes[0].pvSeg);
2498	hw0 = RT_N2H_U32(pcrgResBHS[0]);
2499	switch (hw0 & ISCSIOP_MASK)
2500	{
2501	case ISCSIOP_NOP_IN:
2502	/* NOP-In responses must not be split into several PDUs nor it may contain
2503	* ping data for target-initiated pings nor may both task tags be valid task tags. */
2504	if ( (hw0 & ISCSI_FINAL_BIT) == 0
2505	\|\| ( RT_N2H_U32(pcrgResBHS[4]) == ISCSI_TASK_TAG_RSVD
2506	&& RT_N2H_U32(pcrgResBHS[1]) != 0)
2507	\|\| ( RT_N2H_U32(pcrgResBHS[4]) != ISCSI_TASK_TAG_RSVD
2508	&& RT_N2H_U32(pcrgResBHS[5]) != ISCSI_TASK_TAG_RSVD))
2509	return VERR_PARSE_ERROR;
2510	break;
2511	case ISCSIOP_SCSI_RES:
2512	/* SCSI responses must not be split into several PDUs nor must the residual
2513	* bits be contradicting each other nor may the residual bits be set for PDUs
2514	* containing anything else but a completed command response. Underflow
2515	* is no reason for declaring a PDU as invalid, as the target may choose
2516	* to return less data than we assume to get. */
2517	if ( (hw0 & ISCSI_FINAL_BIT) == 0
2518	\|\| ((hw0 & ISCSI_BI_READ_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_BI_READ_RESIDUAL_UNFL_BIT))
2519	\|\| ((hw0 & ISCSI_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_RESIDUAL_UNFL_BIT))
2520	\|\| ( ((hw0 & ISCSI_SCSI_RESPONSE_MASK) == 0)
2521	&& ((hw0 & ISCSI_SCSI_STATUS_MASK) == SCSI_STATUS_OK)
2522	&& (hw0 & ( ISCSI_BI_READ_RESIDUAL_OVFL_BIT \| ISCSI_BI_READ_RESIDUAL_UNFL_BIT
2523	\| ISCSI_RESIDUAL_OVFL_BIT))))
2524	return VERR_PARSE_ERROR;
2525	break;
2526	case ISCSIOP_LOGIN_RES:
2527	/* Login responses must not contain contradicting transit and continue bits. */
2528	if ((hw0 & ISCSI_CONTINUE_BIT) && ((hw0 & ISCSI_TRANSIT_BIT) != 0))
2529	return VERR_PARSE_ERROR;
2530	break;
2531	case ISCSIOP_TEXT_RES:
2532	/* Text responses must not contain contradicting final and continue bits nor
2533	* may the final bit be set for PDUs containing a target transfer tag other than
2534	* the reserved transfer tag (and vice versa). */
2535	if ( (((hw0 & ISCSI_CONTINUE_BIT) && (hw0 & ISCSI_FINAL_BIT) != 0))
2536	\|\| (((hw0 & ISCSI_FINAL_BIT) && (RT_N2H_U32(pcrgResBHS[5]) != ISCSI_TASK_TAG_RSVD)))
2537	\|\| (((hw0 & ISCSI_FINAL_BIT) == 0) && (RT_N2H_U32(pcrgResBHS[5]) == ISCSI_TASK_TAG_RSVD)))
2538	return VERR_PARSE_ERROR;
2539	break;
2540	case ISCSIOP_SCSI_DATA_IN:
2541	/* SCSI Data-in responses must not contain contradicting residual bits when
2542	* status bit is set. */
2543	if ((hw0 & ISCSI_STATUS_BIT) && (hw0 & ISCSI_RESIDUAL_OVFL_BIT) && (hw0 & ISCSI_RESIDUAL_UNFL_BIT))
2544	return VERR_PARSE_ERROR;
2545	break;
2546	case ISCSIOP_LOGOUT_RES:
2547	/* Logout responses must not have the final bit unset and may not contain any
2548	* data or additional header segments. */
2549	if ( ((hw0 & ISCSI_FINAL_BIT) == 0)
2550	\|\| (RT_N2H_U32(pcrgResBHS[1]) != 0))
2551	return VERR_PARSE_ERROR;
2552	break;
2553	case ISCSIOP_ASYN_MSG:
2554	/* Asynchronous Messages must not have the final bit unset and may not contain
2555	* an initiator task tag. */
2556	if ( ((hw0 & ISCSI_FINAL_BIT) == 0)
2557	\|\| (RT_N2H_U32(pcrgResBHS[4]) != ISCSI_TASK_TAG_RSVD))
2558	return VERR_PARSE_ERROR;
2559	break;
2560	case ISCSIOP_SCSI_TASKMGMT_RES:
2561	case ISCSIOP_R2T:
2562	case ISCSIOP_REJECT:
2563	default:
2564	/* Do some logging, ignore PDU. */
2565	LogFlowFunc(("ignore unhandled PDU, first word %#08x\n", RT_N2H_U32(pcrgResBHS[0])));
2566	return VERR_PARSE_ERROR;
2567	}
2568	/* A target must not send PDUs with MaxCmdSN less than ExpCmdSN-1. */
2569
2570	if (serial_number_less(RT_N2H_U32(pcrgResBHS[8]), RT_N2H_U32(pcrgResBHS[7])-1))
2571	return VERR_PARSE_ERROR;
2572
2573	return VINF_SUCCESS;
2574	}
2575
2576
2577	/**
2578	* Prepares a PDU to transfer for the given command and adds it to the list.
2579	*/
2580	static int iscsiPDUTxPrepare(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
2581	{
2582	int rc = VINF_SUCCESS;
2583	uint32_t *paReqBHS;
2584	size_t cbData = 0;
2585	size_t cbSegs = 0;
2586	PSCSIREQ pScsiReq;
2587	PISCSIPDUTX pIScsiPDU = NULL;
2588
2589	LogFlowFunc(("pImage=%#p pIScsiCmd=%#p\n", pImage, pIScsiCmd));
2590
2591	Assert(pIScsiCmd->enmCmdType == ISCSICMDTYPE_REQ);
2592
2593	pIScsiCmd->Itt = iscsiNewITT(pImage);
2594	pScsiReq = pIScsiCmd->CmdType.ScsiReq.pScsiReq;
2595
2596	if (pScsiReq->cT2ISegs)
2597	RTSgBufInit(&pScsiReq->SgBufT2I, pScsiReq->paT2ISegs, pScsiReq->cT2ISegs);
2598
2599	/*
2600	* Allocate twice as much entries as required for padding (worst case).
2601	* The additional segment is for the BHS.
2602	*/
2603	size_t cI2TSegs = 2*(pScsiReq->cI2TSegs + 1);
2604	pIScsiPDU = (PISCSIPDUTX)RTMemAllocZ(RT_OFFSETOF(ISCSIPDUTX, aISCSIReq[cI2TSegs]));
2605	if (!pIScsiPDU)
2606	return VERR_NO_MEMORY;
2607
2608	pIScsiPDU->pIScsiCmd = pIScsiCmd;
2609
2610	if (pScsiReq->enmXfer == SCSIXFER_FROM_TARGET)
2611	cbData = (uint32_t)pScsiReq->cbT2IData;
2612	else
2613	cbData = (uint32_t)pScsiReq->cbI2TData;
2614
2615	paReqBHS = pIScsiPDU->aBHS;
2616
2617	/* Setup the BHS. */
2618	paReqBHS[0] = RT_H2N_U32( ISCSI_FINAL_BIT \| ISCSI_TASK_ATTR_SIMPLE \| ISCSIOP_SCSI_CMD
2619	\| (pScsiReq->enmXfer << 21)); /* I=0,F=1,Attr=Simple */
2620	paReqBHS[1] = RT_H2N_U32(0x00000000 \| ((uint32_t)pScsiReq->cbI2TData & 0xffffff)); /* TotalAHSLength=0 */
2621	paReqBHS[2] = RT_H2N_U32(pImage->LUN >> 32);
2622	paReqBHS[3] = RT_H2N_U32(pImage->LUN & 0xffffffff);
2623	paReqBHS[4] = pIScsiCmd->Itt;
2624	paReqBHS[5] = RT_H2N_U32(cbData);
2625	paReqBHS[6] = RT_H2N_U32(pImage->CmdSN);
2626	paReqBHS[7] = RT_H2N_U32(pImage->ExpStatSN);
2627	memcpy(paReqBHS + 8, pScsiReq->pvCDB, pScsiReq->cbCDB);
2628
2629	pIScsiPDU->CmdSN = pImage->CmdSN;
2630	pImage->CmdSN++;
2631
2632	/* Setup the S/G buffers. */
2633	uint32_t cnISCSIReq = 0;
2634	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = sizeof(pIScsiPDU->aBHS);
2635	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = pIScsiPDU->aBHS;
2636	cnISCSIReq++;
2637	cbSegs = sizeof(pIScsiPDU->aBHS);
2638	/* Padding is not necessary for the BHS. */
2639
2640	if (pScsiReq->cbI2TData)
2641	{
2642	for (unsigned cSeg = 0; cSeg < pScsiReq->cI2TSegs; cSeg++)
2643	{
2644	Assert(cnISCSIReq < cI2TSegs);
2645	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = pScsiReq->paI2TSegs[cSeg].cbSeg;
2646	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = pScsiReq->paI2TSegs[cSeg].pvSeg;
2647	cbSegs += pScsiReq->paI2TSegs[cSeg].cbSeg;
2648	cnISCSIReq++;
2649
2650	/* Add padding if necessary. */
2651	if (pScsiReq->paI2TSegs[cSeg].cbSeg & 3)
2652	{
2653	Assert(cnISCSIReq < cI2TSegs);
2654	pIScsiPDU->aISCSIReq[cnISCSIReq].pvSeg = &pImage->aPadding[0];
2655	pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg = 4 - (pScsiReq->paI2TSegs[cSeg].cbSeg & 3);
2656	cbSegs += pIScsiPDU->aISCSIReq[cnISCSIReq].cbSeg;
2657	cnISCSIReq++;
2658	}
2659	}
2660	}
2661
2662	pIScsiPDU->cISCSIReq = cnISCSIReq;
2663	pIScsiPDU->cbSgLeft = cbSegs;
2664	RTSgBufInit(&pIScsiPDU->SgBuf, pIScsiPDU->aISCSIReq, cnISCSIReq);
2665
2666	/* Link the PDU to the list. */
2667	iscsiPDUTxAdd(pImage, pIScsiPDU, false /* fFront */);
2668
2669	/* Start transfer of a PDU if there is no one active at the moment. */
2670	if (!pImage->pIScsiPDUTxCur)
2671	rc = iscsiSendPDUAsync(pImage);
2672
2673	return rc;
2674	}
2675
2676
2677	/**
2678	* Updates the state of a request from the PDU we received.
2679	*
2680	* @return VBox status code.
2681	* @param pImage iSCSI connection state to use.
2682	* @param paRes Pointer to array of iSCSI response sections.
2683	* @param cnRes Number of valid iSCSI response sections in the array.
2684	*/
2685	static int iscsiRecvPDUUpdateRequest(PISCSIIMAGE pImage, PISCSIRES paRes, uint32_t cnRes)
2686	{
2687	int rc = VINF_SUCCESS;
2688	PISCSICMD pIScsiCmd;
2689	uint32_t *paResBHS;
2690
2691	LogFlowFunc(("pImage=%#p paRes=%#p cnRes=%u\n", pImage, paRes, cnRes));
2692
2693	Assert(cnRes == 1);
2694	Assert(paRes[0].cbSeg >= ISCSI_BHS_SIZE);
2695
2696	paResBHS = (uint32_t *)paRes[0].pvSeg;
2697
2698	pIScsiCmd = iscsiCmdGetFromItt(pImage, paResBHS[4]);
2699
2700	if (pIScsiCmd)
2701	{
2702	bool final = false;
2703	PSCSIREQ pScsiReq;
2704
2705	LogFlow(("Found SCSI command %#p for Itt=%#u\n", pIScsiCmd, paResBHS[4]));
2706
2707	Assert(pIScsiCmd->enmCmdType == ISCSICMDTYPE_REQ);
2708	pScsiReq = pIScsiCmd->CmdType.ScsiReq.pScsiReq;
2709
2710	final = !!(RT_N2H_U32(paResBHS[0]) & ISCSI_FINAL_BIT);
2711	ISCSIOPCODE cmd = (ISCSIOPCODE)(RT_N2H_U32(paResBHS[0]) & ISCSIOP_MASK);
2712	if (cmd == ISCSIOP_SCSI_RES)
2713	{
2714	/* This is the final PDU which delivers the status (and may be omitted if
2715	* the last Data-In PDU included successful completion status). Note
2716	* that ExpStatSN has been bumped already in iscsiRecvPDU. */
2717	if (!final \|\| ((RT_N2H_U32(paResBHS[0]) & 0x0000ff00) != 0) \|\| (RT_N2H_U32(paResBHS[6]) != pImage->ExpStatSN - 1))
2718	{
2719	/* SCSI Response in the wrong place or with a (target) failure. */
2720	LogFlow(("Wrong ExpStatSN value in PDU\n"));
2721	rc = VERR_PARSE_ERROR;
2722	}
2723	else
2724	{
2725	pScsiReq->status = RT_N2H_U32(paResBHS[0]) & 0x000000ff;
2726	size_t cbData = RT_N2H_U32(paResBHS[1]) & 0x00ffffff;
2727	void pvSense = (uint8_t )paRes[0].pvSeg + ISCSI_BHS_SIZE;
2728
2729	if (cbData >= 2)
2730	{
2731	uint32_t cbStat = RT_N2H_U32(((uint32_t *)pvSense)[0]) >> 16;
2732	if (cbStat + 2 > cbData)
2733	{
2734	rc = VERR_BUFFER_OVERFLOW;
2735	}
2736	else
2737	{
2738	/* Truncate sense data if it doesn't fit into the buffer. */
2739	pScsiReq->cbSense = RT_MIN(cbStat, pScsiReq->cbSense);
2740	memcpy(pScsiReq->pvSense, (uint8_t *)pvSense + 2,
2741	RT_MIN(paRes[0].cbSeg - ISCSI_BHS_SIZE - 2, pScsiReq->cbSense));
2742	}
2743	}
2744	else if (cbData == 1)
2745	rc = VERR_PARSE_ERROR;
2746	else
2747	pScsiReq->cbSense = 0;
2748	}
2749	iscsiCmdComplete(pImage, pIScsiCmd, rc);
2750	}
2751	else if (cmd == ISCSIOP_SCSI_DATA_IN)
2752	{
2753	/* A Data-In PDU carries some data that needs to be added to the received
2754	* data in response to the command. There may be both partial and complete
2755	* Data-In PDUs, so collect data until the status is included or the status
2756	* is sent in a separate SCSI Result frame (see above). */
2757	size_t cbData = RT_N2H_U32(paResBHS[1]) & 0x00ffffff;
2758	void pvData = (uint8_t )paRes[0].pvSeg + ISCSI_BHS_SIZE;
2759
2760	if (final && cbData > pScsiReq->cbT2IData)
2761	{
2762	/* The received PDU is bigger than what we requested.
2763	* Must not happen under normal circumstances and is a target error. */
2764	rc = VERR_BUFFER_OVERFLOW;
2765	}
2766	else
2767	{
2768	/* Copy data from the received PDU into the T2I segments. */
2769	size_t cbCopied = RTSgBufCopyFromBuf(&pScsiReq->SgBufT2I, pvData, cbData);
2770	Assert(cbCopied == cbData);
2771
2772	if (final && (RT_N2H_U32(paResBHS[0]) & ISCSI_STATUS_BIT) != 0)
2773	{
2774	pScsiReq->status = RT_N2H_U32(paResBHS[0]) & 0x000000ff;
2775	pScsiReq->cbSense = 0;
2776	iscsiCmdComplete(pImage, pIScsiCmd, VINF_SUCCESS);
2777	}
2778	}
2779	}
2780	else
2781	rc = VERR_PARSE_ERROR;
2782	}
2783
2784	/* Log any errors here but ignore the PDU. */
2785	if (RT_FAILURE(rc))
2786	{
2787	LogRel(("iSCSI: Received malformed PDU from target %s (rc=%Rrc), ignoring\n", pImage->pszTargetName, rc));
2788	rc = VINF_SUCCESS;
2789	}
2790
2791	return rc;
2792	}
2793
2794	/**
2795	* Appends a key-value pair to the buffer. Normal ASCII strings (cbValue == 0) and large binary values
2796	* of a given length (cbValue > 0) are directly supported. Other value types must be converted to ASCII
2797	* by the caller. Strings must be in UTF-8 encoding.
2798	*
2799	* @returns VBOX status
2800	* @param pbBuf Pointer to the key-value buffer.
2801	* @param cbBuf Length of the key-value buffer.
2802	* @param pcbBufCurr Currently used portion of the key-value buffer.
2803	* @param pszKey Pointer to a string containing the key.
2804	* @param pszValue Pointer to either a string containing the value or to a large binary value.
2805	* @param cbValue Length of the binary value if applicable.
2806	*/
2807	static int iscsiTextAddKeyValue(uint8_t pbBuf, size_t cbBuf, size_t pcbBufCurr, const char *pcszKey,
2808	const char *pcszValue, size_t cbValue)
2809	{
2810	size_t cbBufTmp = *pcbBufCurr;
2811	size_t cbKey = strlen(pcszKey);
2812	size_t cbValueEnc;
2813	uint8_t *pbCurr;
2814
2815	if (cbValue == 0)
2816	cbValueEnc = strlen(pcszValue);
2817	else
2818	cbValueEnc = cbValue * 2 + 2; /* 2 hex bytes per byte, 2 bytes prefix */
2819
2820	if (cbBuf < cbBufTmp + cbKey + 1 + cbValueEnc + 1)
2821	{
2822	/* Buffer would overflow, signal error. */
2823	return VERR_BUFFER_OVERFLOW;
2824	}
2825
2826	/*
2827	* Append a key=value pair (zero terminated string) to the end of the buffer.
2828	*/
2829	pbCurr = pbBuf + cbBufTmp;
2830	memcpy(pbCurr, pcszKey, cbKey);
2831	pbCurr += cbKey;
2832	*pbCurr++ = '=';
2833	if (cbValue == 0)
2834	{
2835	memcpy(pbCurr, pcszValue, cbValueEnc);
2836	pbCurr += cbValueEnc;
2837	}
2838	else
2839	{
2840	*pbCurr++ = '0';
2841	*pbCurr++ = 'x';
2842	for (uint32_t i = 0; i < cbValue; i++)
2843	{
2844	uint8_t b;
2845	b = pcszValue[i];
2846	*pbCurr++ = NUM_2_HEX(b >> 4);
2847	*pbCurr++ = NUM_2_HEX(b & 0xf);
2848	}
2849	}
2850	*pbCurr = '\0';
2851	*pcbBufCurr = cbBufTmp + cbKey + 1 + cbValueEnc + 1;
2852
2853	return VINF_SUCCESS;
2854	}
2855
2856
2857	/**
2858	* Retrieve the value for a given key from the key=value buffer.
2859	*
2860	* @returns VBOX status.
2861	* @param pbBuf Buffer containing key=value pairs.
2862	* @param cbBuf Length of buffer with key=value pairs.
2863	* @param pszKey Pointer to key for which to retrieve the value.
2864	* @param ppszValue Pointer to value string pointer.
2865	*/
2866	static int iscsiTextGetKeyValue(const uint8_t pbBuf, size_t cbBuf, const char pcszKey, const char **ppcszValue)
2867	{
2868	size_t cbKey = strlen(pcszKey);
2869
2870	while (cbBuf != 0)
2871	{
2872	size_t cbKeyValNull = strlen((const char *)pbBuf) + 1;
2873
2874	if (strncmp(pcszKey, (const char *)pbBuf, cbKey) == 0 && pbBuf[cbKey] == '=')
2875	{
2876	ppcszValue = (const char )(pbBuf + cbKey + 1);
2877	return VINF_SUCCESS;
2878	}
2879	pbBuf += cbKeyValNull;
2880	cbBuf -= cbKeyValNull;
2881	}
2882	return VERR_INVALID_NAME;
2883	}
2884
2885
2886	/**
2887	* Convert a long-binary value from a value string to the binary representation.
2888	*
2889	* @returns VBOX status
2890	* @param pszValue Pointer to a string containing the textual value representation.
2891	* @param pbValue Pointer to the value buffer for the binary value.
2892	* @param pcbValue In: length of value buffer, out: actual length of binary value.
2893	*/
2894	static int iscsiStrToBinary(const char pcszValue, uint8_t pbValue, size_t *pcbValue)
2895	{
2896	size_t cbValue = *pcbValue;
2897	char c1, c2, c3, c4;
2898	Assert(cbValue >= 1);
2899
2900	if (strlen(pcszValue) < 3)
2901	return VERR_PARSE_ERROR;
2902	if (*pcszValue++ != '0')
2903	return VERR_PARSE_ERROR;
2904	switch (*pcszValue++)
2905	{
2906	case 'x':
2907	case 'X':
2908	if (strlen(pcszValue) & 1)
2909	{
2910	c1 = *pcszValue++;
2911	*pbValue++ = HEX_2_NUM(c1);
2912	cbValue--;
2913	}
2914	while (*pcszValue != '\0')
2915	{
2916	if (cbValue == 0)
2917	return VERR_BUFFER_OVERFLOW;
2918	c1 = *pcszValue++;
2919	if ((c1 < '0' \|\| c1 > '9') && (c1 < 'a' \|\| c1 > 'f') && (c1 < 'A' \|\| c1 > 'F'))
2920	return VERR_PARSE_ERROR;
2921	c2 = *pcszValue++;
2922	if ((c2 < '0' \|\| c2 > '9') && (c2 < 'a' \|\| c2 > 'f') && (c2 < 'A' \|\| c2 > 'F'))
2923	return VERR_PARSE_ERROR;
2924	*pbValue++ = (HEX_2_NUM(c1) << 4) \| HEX_2_NUM(c2);
2925	cbValue--;
2926	}
2927	*pcbValue -= cbValue;
2928	break;
2929	case 'b':
2930	case 'B':
2931	if ((strlen(pcszValue) & 3) != 0)
2932	return VERR_PARSE_ERROR;
2933	while (*pcszValue != '\0')
2934	{
2935	uint32_t temp;
2936	if (cbValue == 0)
2937	return VERR_BUFFER_OVERFLOW;
2938	c1 = *pcszValue++;
2939	if ((c1 < 'A' \|\| c1 > 'Z') && (c1 < 'a' \|\| c1 >'z') && (c1 < '0' \|\| c1 > '9') && (c1 != '+') && (c1 != '/'))
2940	return VERR_PARSE_ERROR;
2941	c2 = *pcszValue++;
2942	if ((c2 < 'A' \|\| c2 > 'Z') && (c2 < 'a' \|\| c2 >'z') && (c2 < '0' \|\| c2 > '9') && (c2 != '+') && (c2 != '/'))
2943	return VERR_PARSE_ERROR;
2944	c3 = *pcszValue++;
2945	if ((c3 < 'A' \|\| c3 > 'Z') && (c3 < 'a' \|\| c3 >'z') && (c3 < '0' \|\| c3 > '9') && (c3 != '+') && (c3 != '/') && (c3 != '='))
2946	return VERR_PARSE_ERROR;
2947	c4 = *pcszValue++;
2948	if ( (c3 == '=' && c4 != '=')
2949	\|\| ((c4 < 'A' \|\| c4 > 'Z') && (c4 < 'a' \|\| c4 >'z') && (c4 < '0' \|\| c4 > '9') && (c4 != '+') && (c4 != '/') && (c4 != '=')))
2950	return VERR_PARSE_ERROR;
2951	temp = (B64_2_NUM(c1) << 18) \| (B64_2_NUM(c2) << 12);
2952	if (c3 == '=') {
2953	if (*pcszValue != '\0')
2954	return VERR_PARSE_ERROR;
2955	*pbValue++ = temp >> 16;
2956	cbValue--;
2957	} else {
2958	temp \|= B64_2_NUM(c3) << 6;
2959	if (c4 == '=') {
2960	if (*pcszValue != '\0')
2961	return VERR_PARSE_ERROR;
2962	if (cbValue < 2)
2963	return VERR_BUFFER_OVERFLOW;
2964	*pbValue++ = temp >> 16;
2965	*pbValue++ = (temp >> 8) & 0xff;
2966	cbValue -= 2;
2967	}
2968	else
2969	{
2970	temp \|= B64_2_NUM(c4);
2971	if (cbValue < 3)
2972	return VERR_BUFFER_OVERFLOW;
2973	*pbValue++ = temp >> 16;
2974	*pbValue++ = (temp >> 8) & 0xff;
2975	*pbValue++ = temp & 0xff;
2976	cbValue -= 3;
2977	}
2978	}
2979	}
2980	*pcbValue -= cbValue;
2981	break;
2982	default:
2983	return VERR_PARSE_ERROR;
2984	}
2985	return VINF_SUCCESS;
2986	}
2987
2988
2989	/**
2990	* Retrieve the relevant parameter values and update the initiator state.
2991	*
2992	* @returns VBOX status.
2993	* @param pImage Current iSCSI initiator state.
2994	* @param pbBuf Buffer containing key=value pairs.
2995	* @param cbBuf Length of buffer with key=value pairs.
2996	*/
2997	static int iscsiUpdateParameters(PISCSIIMAGE pImage, const uint8_t *pbBuf, size_t cbBuf)
2998	{
2999	int rc;
3000	const char *pcszMaxRecvDataSegmentLength = NULL;
3001	const char *pcszMaxBurstLength = NULL;
3002	const char *pcszFirstBurstLength = NULL;
3003	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "MaxRecvDataSegmentLength", &pcszMaxRecvDataSegmentLength);
3004	if (rc == VERR_INVALID_NAME)
3005	rc = VINF_SUCCESS;
3006	if (RT_FAILURE(rc))
3007	return VERR_PARSE_ERROR;
3008	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "MaxBurstLength", &pcszMaxBurstLength);
3009	if (rc == VERR_INVALID_NAME)
3010	rc = VINF_SUCCESS;
3011	if (RT_FAILURE(rc))
3012	return VERR_PARSE_ERROR;
3013	rc = iscsiTextGetKeyValue(pbBuf, cbBuf, "FirstBurstLength", &pcszFirstBurstLength);
3014	if (rc == VERR_INVALID_NAME)
3015	rc = VINF_SUCCESS;
3016	if (RT_FAILURE(rc))
3017	return VERR_PARSE_ERROR;
3018	if (pcszMaxRecvDataSegmentLength)
3019	{
3020	uint32_t cb = pImage->cbSendDataLength;
3021	rc = RTStrToUInt32Full(pcszMaxRecvDataSegmentLength, 0, &cb);
3022	AssertRC(rc);
3023	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3024	}
3025	if (pcszMaxBurstLength)
3026	{
3027	uint32_t cb = pImage->cbSendDataLength;
3028	rc = RTStrToUInt32Full(pcszMaxBurstLength, 0, &cb);
3029	AssertRC(rc);
3030	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3031	}
3032	if (pcszFirstBurstLength)
3033	{
3034	uint32_t cb = pImage->cbSendDataLength;
3035	rc = RTStrToUInt32Full(pcszFirstBurstLength, 0, &cb);
3036	AssertRC(rc);
3037	pImage->cbSendDataLength = RT_MIN(pImage->cbSendDataLength, cb);
3038	}
3039	return VINF_SUCCESS;
3040	}
3041
3042
3043	static bool serial_number_less(uint32_t s1, uint32_t s2)
3044	{
3045	return (s1 < s2 && s2 - s1 < 0x80000000) \|\| (s1 > s2 && s1 - s2 > 0x80000000);
3046	}
3047
3048	static bool serial_number_greater(uint32_t s1, uint32_t s2)
3049	{
3050	return (s1 < s2 && s2 - s1 > 0x80000000) \|\| (s1 > s2 && s1 - s2 < 0x80000000);
3051	}
3052
3053
3054	#ifdef IMPLEMENT_TARGET_AUTH
3055	static void chap_md5_generate_challenge(uint8_t pbChallenge, size_t pcbChallenge)
3056	{
3057	uint8_t cbChallenge;
3058
3059	cbChallenge = RTrand_U8(CHAP_MD5_CHALLENGE_MIN, CHAP_MD5_CHALLENGE_MAX);
3060	RTrand_bytes(pbChallenge, cbChallenge);
3061	*pcbChallenge = cbChallenge;
3062	}
3063	#endif
3064
3065
3066	static void chap_md5_compute_response(uint8_t pbResponse, uint8_t id, const uint8_t pbChallenge, size_t cbChallenge,
3067	const uint8_t *pbSecret, size_t cbSecret)
3068	{
3069	RTMD5CONTEXT ctx;
3070	uint8_t bId;
3071
3072	bId = id;
3073	RTMd5Init(&ctx);
3074	RTMd5Update(&ctx, &bId, 1);
3075	RTMd5Update(&ctx, pbSecret, cbSecret);
3076	RTMd5Update(&ctx, pbChallenge, cbChallenge);
3077	RTMd5Final(pbResponse, &ctx);
3078	}
3079
3080	/**
3081	* Internal. - Wrapper around the extended select callback of the net interface.
3082	*/
3083	DECLINLINE(int) iscsiIoThreadWait(PISCSIIMAGE pImage, RTMSINTERVAL cMillies, uint32_t fEvents, uint32_t *pfEvents)
3084	{
3085	return pImage->pIfNet->pfnSelectOneEx(pImage->Socket, fEvents, pfEvents, cMillies);
3086	}
3087
3088	/**
3089	* Internal. - Pokes a thread waiting for I/O.
3090	*/
3091	DECLINLINE(int) iscsiIoThreadPoke(PISCSIIMAGE pImage)
3092	{
3093	return pImage->pIfNet->pfnPoke(pImage->Socket);
3094	}
3095
3096	/**
3097	* Internal. - Get the next request from the queue.
3098	*/
3099	DECLINLINE(PISCSICMD) iscsiCmdGet(PISCSIIMAGE pImage)
3100	{
3101	int rc;
3102	PISCSICMD pIScsiCmd = NULL;
3103
3104	rc = RTSemMutexRequest(pImage->MutexReqQueue, RT_INDEFINITE_WAIT);
3105	AssertRC(rc);
3106
3107	pIScsiCmd = pImage->pScsiReqQueue;
3108	if (pIScsiCmd)
3109	{
3110	pImage->pScsiReqQueue = pIScsiCmd->pNext;
3111	pIScsiCmd->pNext = NULL;
3112	}
3113
3114	rc = RTSemMutexRelease(pImage->MutexReqQueue);
3115	AssertRC(rc);
3116
3117	return pIScsiCmd;
3118	}
3119
3120
3121	/**
3122	* Internal. - Adds the given command to the queue.
3123	*/
3124	DECLINLINE(int) iscsiCmdPut(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd)
3125	{
3126	int rc = RTSemMutexRequest(pImage->MutexReqQueue, RT_INDEFINITE_WAIT);
3127	AssertRC(rc);
3128
3129	pIScsiCmd->pNext = pImage->pScsiReqQueue;
3130	pImage->pScsiReqQueue = pIScsiCmd;
3131
3132	rc = RTSemMutexRelease(pImage->MutexReqQueue);
3133	AssertRC(rc);
3134
3135	iscsiIoThreadPoke(pImage);
3136
3137	return rc;
3138	}
3139
3140	/**
3141	* Internal. - Completes the request with the appropriate action.
3142	* Synchronous requests are completed with waking up the thread
3143	* and asynchronous ones by continuing the associated I/O context.
3144	*/
3145	static void iscsiCmdComplete(PISCSIIMAGE pImage, PISCSICMD pIScsiCmd, int rcCmd)
3146	{
3147	LogFlowFunc(("pImage=%#p pIScsiCmd=%#p rcCmd=%Rrc\n", pImage, pIScsiCmd, rcCmd));
3148
3149	/* Remove from the table first. */
3150	iscsiCmdRemove(pImage, pIScsiCmd->Itt);
3151
3152	/* Call completion callback. */
3153	pIScsiCmd->pfnComplete(pImage, rcCmd, pIScsiCmd->pvUser);
3154
3155	/* Free command structure. */
3156	#ifdef DEBUG
3157	memset(pIScsiCmd, 0xff, sizeof(ISCSICMD));
3158	#endif
3159	RTMemFree(pIScsiCmd);
3160	}
3161
3162	/**
3163	* Reattaches the to the target after an error aborting
3164	* pending commands and resending them.
3165	*
3166	* @param pImage iSCSI connection state.
3167	*/
3168	static void iscsiReattach(PISCSIIMAGE pImage)
3169	{
3170	int rc = VINF_SUCCESS;
3171	PISCSICMD pIScsiCmdHead = NULL;
3172	PISCSICMD pIScsiCmd = NULL;
3173	PISCSICMD pIScsiCmdCur = NULL;
3174	PISCSIPDUTX pIScsiPDUTx = NULL;
3175
3176	/* Close connection. */
3177	iscsiTransportClose(pImage);
3178	pImage->state = ISCSISTATE_FREE;
3179
3180	/* Reset PDU we are receiving. */
3181	iscsiRecvPDUReset(pImage);
3182
3183	/*
3184	* Abort all PDUs we are about to transmit,
3185	* the command need a new Itt if the relogin is successful.
3186	*/
3187	while (pImage->pIScsiPDUTxHead)
3188	{
3189	pIScsiPDUTx = pImage->pIScsiPDUTxHead;
3190	pImage->pIScsiPDUTxHead = pIScsiPDUTx->pNext;
3191
3192	pIScsiCmd = pIScsiPDUTx->pIScsiCmd;
3193
3194	if (pIScsiCmd)
3195	{
3196	/* Place on command list. */
3197	pIScsiCmd->pNext = pIScsiCmdHead;
3198	pIScsiCmdHead = pIScsiCmd;
3199	}
3200	RTMemFree(pIScsiPDUTx);
3201	}
3202
3203	/* Clear the tail pointer (safety precaution). */
3204	pImage->pIScsiPDUTxTail = NULL;
3205
3206	/* Clear the current PDU too. */
3207	if (pImage->pIScsiPDUTxCur)
3208	{
3209	pIScsiPDUTx = pImage->pIScsiPDUTxCur;
3210
3211	pImage->pIScsiPDUTxCur = NULL;
3212	pIScsiCmd = pIScsiPDUTx->pIScsiCmd;
3213
3214	if (pIScsiCmd)
3215	{
3216	pIScsiCmd->pNext = pIScsiCmdHead;
3217	pIScsiCmdHead = pIScsiCmd;
3218	}
3219	RTMemFree(pIScsiPDUTx);
3220	}
3221
3222	/*
3223	* Get all commands which are waiting for a response
3224	* They need to be resend too after a successful reconnect.
3225	*/
3226	pIScsiCmd = iscsiCmdRemoveAll(pImage);
3227
3228	if (pIScsiCmd)
3229	{
3230	pIScsiCmdCur = pIScsiCmd;
3231	while (pIScsiCmdCur->pNext)
3232	pIScsiCmdCur = pIScsiCmdCur->pNext;
3233
3234	/*
3235	* Place them in front of the list because they are the oldest requests
3236	* and need to be processed first to minimize the risk to time out.
3237	*/
3238	pIScsiCmdCur->pNext = pIScsiCmdHead;
3239	pIScsiCmdHead = pIScsiCmd;
3240	}
3241
3242	/* Try to attach. */
3243	rc = iscsiAttach(pImage);
3244	if (RT_SUCCESS(rc))
3245	{
3246	/* Phew, we have a connection again.
3247	* Prepare new PDUs for the aborted commands.
3248	*/
3249	while (pIScsiCmdHead)
3250	{
3251	pIScsiCmd = pIScsiCmdHead;
3252	pIScsiCmdHead = pIScsiCmdHead->pNext;
3253
3254	pIScsiCmd->pNext = NULL;
3255
3256	rc = iscsiPDUTxPrepare(pImage, pIScsiCmd);
3257	AssertRC(rc);
3258	}
3259	}
3260	else
3261	{
3262	/*
3263	* Still no luck, complete commands with error so the caller
3264	* has a chance to inform the user and maybe resend the command.
3265	*/
3266	while (pIScsiCmdHead)
3267	{
3268	pIScsiCmd = pIScsiCmdHead;
3269	pIScsiCmdHead = pIScsiCmdHead->pNext;
3270
3271	iscsiCmdComplete(pImage, pIScsiCmd, VERR_BROKEN_PIPE);
3272	}
3273	}
3274	}
3275
3276	/**
3277	* Internal. Main iSCSI I/O worker.
3278	*/
3279	static DECLCALLBACK(int) iscsiIoThreadWorker(RTTHREAD ThreadSelf, void *pvUser)
3280	{
3281	PISCSIIMAGE pImage = (PISCSIIMAGE)pvUser;
3282
3283	/* Initialize the initial event mask. */
3284	pImage->fPollEvents = VD_INTERFACETCPNET_EVT_READ \| VD_INTERFACETCPNET_EVT_ERROR;
3285
3286	while (pImage->fRunning)
3287	{
3288	uint32_t fEvents;
3289	int rc;
3290
3291	fEvents = 0;
3292
3293	/* Wait for work or for data from the target. */
3294	RTMSINTERVAL msWait;
3295
3296	if (pImage->cCmdsWaiting)
3297	{
3298	pImage->fPollEvents &= ~VD_INTERFACETCPNET_HINT_INTERRUPT;
3299	msWait = pImage->uReadTimeout;
3300	}
3301	else
3302	{
3303	pImage->fPollEvents \|= VD_INTERFACETCPNET_HINT_INTERRUPT;
3304	msWait = RT_INDEFINITE_WAIT;
3305	}
3306
3307	LogFlow(("Waiting for events fPollEvents=%#x\n", pImage->fPollEvents));
3308	rc = iscsiIoThreadWait(pImage, msWait, pImage->fPollEvents, &fEvents);
3309	if (rc == VERR_INTERRUPTED)
3310	{
3311	/* Check the queue. */
3312	PISCSICMD pIScsiCmd = iscsiCmdGet(pImage);
3313
3314	while (pIScsiCmd)
3315	{
3316	switch (pIScsiCmd->enmCmdType)
3317	{
3318	case ISCSICMDTYPE_REQ:
3319	{
3320	/* If there is no connection complete the command with an error. */
3321	if (RT_LIKELY(iscsiIsClientConnected(pImage)))
3322	{
3323	rc = iscsiPDUTxPrepare(pImage, pIScsiCmd);
3324	AssertRC(rc);
3325	}
3326	else
3327	iscsiCmdComplete(pImage, pIScsiCmd, VERR_NET_CONNECTION_REFUSED);
3328	break;
3329	}
3330	case ISCSICMDTYPE_EXEC:
3331	{
3332	rc = pIScsiCmd->CmdType.Exec.pfnExec(pIScsiCmd->CmdType.Exec.pvUser);
3333	iscsiCmdComplete(pImage, pIScsiCmd, rc);
3334	break;
3335	}
3336	default:
3337	AssertMsgFailed(("Invalid command type %d\n", pIScsiCmd->enmCmdType));
3338	}
3339
3340	pIScsiCmd = iscsiCmdGet(pImage);
3341	}
3342	}
3343	else if (rc == VERR_TIMEOUT && pImage->cCmdsWaiting)
3344	{
3345	/*
3346	* We are waiting for a response from the target but
3347	* it didn't answered yet.
3348	* We assume the connection is broken and try to reconnect.
3349	*/
3350	LogFlow(("Timed out while waiting for an answer from the target, reconnecting\n"));
3351	iscsiReattach(pImage);
3352	}
3353	else if (RT_SUCCESS(rc) \|\| rc == VERR_TIMEOUT)
3354	{
3355	Assert(pImage->state == ISCSISTATE_NORMAL);
3356	LogFlow(("Got socket events %#x\n", fEvents));
3357
3358	if (fEvents & VD_INTERFACETCPNET_EVT_READ)
3359	{
3360	/* Continue or start a new PDU receive task */
3361	LogFlow(("There is data on the socket\n"));
3362	rc = iscsiRecvPDUAsync(pImage);
3363	if (rc == VERR_BROKEN_PIPE)
3364	iscsiReattach(pImage);
3365	else if (RT_FAILURE(rc))
3366	iscsiLogRel(pImage, "iSCSI: Handling incoming request failed %Rrc\n", rc);
3367	}
3368
3369	if (fEvents & VD_INTERFACETCPNET_EVT_WRITE)
3370	{
3371	LogFlow(("The socket is writable\n"));
3372	rc = iscsiSendPDUAsync(pImage);
3373	if (RT_FAILURE(rc))
3374	{
3375	/*
3376	* Something unexpected happened, log the error and try to reset everything
3377	* by reattaching to the target.
3378	*/
3379	iscsiLogRel(pImage, "iSCSI: Sending PDU failed %Rrc\n", rc);
3380	iscsiReattach(pImage);
3381	}
3382	}
3383
3384	if (fEvents & VD_INTERFACETCPNET_EVT_ERROR)
3385	{
3386	LogFlow(("An error ocurred\n"));
3387	iscsiReattach(pImage);
3388	}
3389	}
3390	else
3391	iscsiLogRel(pImage, "iSCSI: Waiting for I/O failed rc=%Rrc\n", rc);
3392	}
3393
3394	return VINF_SUCCESS;
3395	}
3396
3397	/**
3398	* Internal. - Enqueues a request asynchronously.
3399	*/
3400	static int iscsiCommandAsync(PISCSIIMAGE pImage, PSCSIREQ pScsiReq,
3401	PFNISCSICMDCOMPLETED pfnComplete, void *pvUser)
3402	{
3403	int rc;
3404
3405	if (pImage->fExtendedSelectSupported)
3406	{
3407	PISCSICMD pIScsiCmd = (PISCSICMD)RTMemAllocZ(sizeof(ISCSICMD));
3408	if (!pIScsiCmd)
3409	return VERR_NO_MEMORY;
3410
3411	/* Init the command structure. */
3412	pIScsiCmd->pNext = NULL;
3413	pIScsiCmd->enmCmdType = ISCSICMDTYPE_REQ;
3414	pIScsiCmd->pfnComplete = pfnComplete;
3415	pIScsiCmd->pvUser = pvUser;
3416	pIScsiCmd->CmdType.ScsiReq.pScsiReq = pScsiReq;
3417
3418	rc = iscsiCmdPut(pImage, pIScsiCmd);
3419	if (RT_FAILURE(rc))
3420	RTMemFree(pIScsiCmd);
3421	}
3422	else
3423	rc = VERR_NOT_SUPPORTED;
3424
3425	return rc;
3426	}
3427
3428	static void iscsiCommandCompleteSync(PISCSIIMAGE pImage, int rcReq, void *pvUser)
3429	{
3430	PISCSICMDSYNC pIScsiCmdSync = (PISCSICMDSYNC)pvUser;
3431
3432	pIScsiCmdSync->rcCmd = rcReq;
3433	int rc = RTSemEventSignal(pIScsiCmdSync->EventSem);
3434	AssertRC(rc);
3435	}
3436
3437	/**
3438	* Internal. - Enqueues a request in a synchronous fashion
3439	* i.e. returns when the request completed.
3440	*/
3441	static int iscsiCommandSync(PISCSIIMAGE pImage, PSCSIREQ pScsiReq, bool fRetry, int rcSense)
3442	{
3443	int rc;
3444
3445	if (pImage->fExtendedSelectSupported)
3446	{
3447	ISCSICMDSYNC IScsiCmdSync;
3448
3449	/* Create event semaphore. */
3450	rc = RTSemEventCreate(&IScsiCmdSync.EventSem);
3451	if (RT_FAILURE(rc))
3452	return rc;
3453
3454	if (fRetry)
3455	{
3456	for (unsigned i = 0; i < 10; i++)
3457	{
3458	rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandCompleteSync, &IScsiCmdSync);
3459	if (RT_FAILURE(rc))
3460	break;
3461
3462	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3463	AssertRC(rc);
3464	rc = IScsiCmdSync.rcCmd;
3465
3466	if ( (RT_SUCCESS(rc) && !pScsiReq->cbSense)
3467	\|\| RT_FAILURE(rc))
3468	break;
3469	rc = rcSense;
3470	}
3471	}
3472	else
3473	{
3474	rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandCompleteSync, &IScsiCmdSync);
3475	if (RT_SUCCESS(rc))
3476	{
3477	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3478	AssertRC(rc);
3479	rc = IScsiCmdSync.rcCmd;
3480
3481	if (RT_FAILURE(rc) \|\| pScsiReq->cbSense > 0)
3482	rc = rcSense;
3483	}
3484	}
3485
3486	RTSemEventDestroy(IScsiCmdSync.EventSem);
3487	}
3488	else
3489	{
3490	if (fRetry)
3491	{
3492	for (unsigned i = 0; i < 10; i++)
3493	{
3494	rc = iscsiCommand(pImage, pScsiReq);
3495	if ( (RT_SUCCESS(rc) && !pScsiReq->cbSense)
3496	\|\| RT_FAILURE(rc))
3497	break;
3498	rc = rcSense;
3499	}
3500	}
3501	else
3502	{
3503	rc = iscsiCommand(pImage, pScsiReq);
3504	if (RT_SUCCESS(rc) && pScsiReq->cbSense > 0)
3505	rc = rcSense;
3506	}
3507	}
3508
3509	return rc;
3510	}
3511
3512
3513	/**
3514	* Internal. - Executes a given function in a synchronous fashion
3515	* on the I/O thread if available.
3516	*/
3517	static int iscsiExecSync(PISCSIIMAGE pImage, PFNISCSIEXEC pfnExec, void *pvUser)
3518	{
3519	int rc;
3520
3521	if (pImage->fExtendedSelectSupported)
3522	{
3523	ISCSICMDSYNC IScsiCmdSync;
3524	PISCSICMD pIScsiCmd = (PISCSICMD)RTMemAllocZ(sizeof(ISCSICMD));
3525	if (!pIScsiCmd)
3526	return VERR_NO_MEMORY;
3527
3528	/* Create event semaphore. */
3529	rc = RTSemEventCreate(&IScsiCmdSync.EventSem);
3530	if (RT_FAILURE(rc))
3531	{
3532	RTMemFree(pIScsiCmd);
3533	return rc;
3534	}
3535
3536	/* Init the command structure. */
3537	pIScsiCmd->pNext = NULL;
3538	pIScsiCmd->enmCmdType = ISCSICMDTYPE_EXEC;
3539	pIScsiCmd->pfnComplete = iscsiCommandCompleteSync;
3540	pIScsiCmd->pvUser = &IScsiCmdSync;
3541	pIScsiCmd->CmdType.Exec.pfnExec = pfnExec;
3542	pIScsiCmd->CmdType.Exec.pvUser = pvUser;
3543
3544	rc = iscsiCmdPut(pImage, pIScsiCmd);
3545	if (RT_FAILURE(rc))
3546	RTMemFree(pIScsiCmd);
3547	else
3548	{
3549	rc = RTSemEventWait(IScsiCmdSync.EventSem, RT_INDEFINITE_WAIT);
3550	AssertRC(rc);
3551	rc = IScsiCmdSync.rcCmd;
3552	}
3553
3554	RTSemEventDestroy(IScsiCmdSync.EventSem);
3555	}
3556	else
3557	{
3558	/* No I/O thread, execute in the current thread. */
3559	rc = pfnExec(pvUser);
3560	}
3561
3562	return rc;
3563	}
3564
3565
3566	static void iscsiCommandAsyncComplete(PISCSIIMAGE pImage, int rcReq, void *pvUser)
3567	{
3568	bool fComplete = true;
3569	size_t cbTransfered = 0;
3570	PSCSIREQASYNC pReqAsync = (PSCSIREQASYNC)pvUser;
3571	PSCSIREQ pScsiReq = pReqAsync->pScsiReq;
3572
3573	if ( RT_SUCCESS(rcReq)
3574	&& pScsiReq->cbSense > 0)
3575	{
3576	/* Try again if possible. */
3577	if (pReqAsync->cSenseRetries > 0)
3578	{
3579	pReqAsync->cSenseRetries--;
3580	pScsiReq->cbSense = sizeof(pReqAsync->abSense);
3581	int rc = iscsiCommandAsync(pImage, pScsiReq, iscsiCommandAsyncComplete, pReqAsync);
3582	if (RT_SUCCESS(rc))
3583	fComplete = false;
3584	else
3585	rcReq = pReqAsync->rcSense;
3586	}
3587	else
3588	rcReq = pReqAsync->rcSense;
3589	}
3590
3591	if (fComplete)
3592	{
3593	if (pScsiReq->enmXfer == SCSIXFER_FROM_TARGET)
3594	cbTransfered = pScsiReq->cbT2IData;
3595	else if (pScsiReq->enmXfer == SCSIXFER_TO_TARGET)
3596	cbTransfered = pScsiReq->cbI2TData;
3597	else
3598	AssertMsg(pScsiReq->enmXfer == SCSIXFER_NONE, ("To/From transfers are not supported yet\n"));
3599
3600	/* Continue I/O context. */
3601	pImage->pIfIo->pfnIoCtxCompleted(pImage->pIfIo->Core.pvUser,
3602	pReqAsync->pIoCtx, rcReq,
3603	cbTransfered);
3604
3605	RTMemFree(pScsiReq);
3606	RTMemFree(pReqAsync);
3607	}
3608	}
3609
3610
3611	/**
3612	* Internal. Free all allocated space for representing an image, and optionally
3613	* delete the image from disk.
3614	*/
3615	static int iscsiFreeImage(PISCSIIMAGE pImage, bool fDelete)
3616	{
3617	int rc = VINF_SUCCESS;
3618	Assert(!fDelete); /* This MUST be false, the flag isn't supported. */
3619
3620	/* Freeing a never allocated image (e.g. because the open failed) is
3621	* not signalled as an error. After all nothing bad happens. */
3622	if (pImage)
3623	{
3624	if (pImage->Mutex != NIL_RTSEMMUTEX)
3625	{
3626	/* Detaching only makes sense when the mutex is there. Otherwise the
3627	* failure happened long before we could attach to the target. */
3628	iscsiExecSync(pImage, iscsiDetach, pImage);
3629	RTSemMutexDestroy(pImage->Mutex);
3630	pImage->Mutex = NIL_RTSEMMUTEX;
3631	}
3632	if (pImage->hThreadIo != NIL_RTTHREAD)
3633	{
3634	ASMAtomicXchgBool(&pImage->fRunning, false);
3635	rc = iscsiIoThreadPoke(pImage);
3636	AssertRC(rc);
3637
3638	/* Wait for the thread to terminate. */
3639	rc = RTThreadWait(pImage->hThreadIo, RT_INDEFINITE_WAIT, NULL);
3640	AssertRC(rc);
3641	}
3642	/* Destroy the socket. */
3643	if (pImage->Socket != NIL_VDSOCKET)
3644	{
3645	pImage->pIfNet->pfnSocketDestroy(pImage->Socket);
3646	}
3647	if (pImage->MutexReqQueue != NIL_RTSEMMUTEX)
3648	{
3649	RTSemMutexDestroy(pImage->MutexReqQueue);
3650	pImage->MutexReqQueue = NIL_RTSEMMUTEX;
3651	}
3652	if (pImage->pszTargetName)
3653	{
3654	RTMemFree(pImage->pszTargetName);
3655	pImage->pszTargetName = NULL;
3656	}
3657	if (pImage->pszInitiatorName)
3658	{
3659	if (pImage->fAutomaticInitiatorName)
3660	RTStrFree(pImage->pszInitiatorName);
3661	else
3662	RTMemFree(pImage->pszInitiatorName);
3663	pImage->pszInitiatorName = NULL;
3664	}
3665	if (pImage->pszInitiatorUsername)
3666	{
3667	RTMemFree(pImage->pszInitiatorUsername);
3668	pImage->pszInitiatorUsername = NULL;
3669	}
3670	if (pImage->pbInitiatorSecret)
3671	{
3672	RTMemFree(pImage->pbInitiatorSecret);
3673	pImage->pbInitiatorSecret = NULL;
3674	}
3675	if (pImage->pszTargetUsername)
3676	{
3677	RTMemFree(pImage->pszTargetUsername);
3678	pImage->pszTargetUsername = NULL;
3679	}
3680	if (pImage->pbTargetSecret)
3681	{
3682	RTMemFree(pImage->pbTargetSecret);
3683	pImage->pbTargetSecret = NULL;
3684	}
3685	if (pImage->pvRecvPDUBuf)
3686	{
3687	RTMemFree(pImage->pvRecvPDUBuf);
3688	pImage->pvRecvPDUBuf = NULL;
3689	}
3690
3691	pImage->cbRecvPDUResidual = 0;
3692	}
3693
3694	LogFlowFunc(("returns %Rrc\n", rc));
3695	return rc;
3696	}
3697
3698	/**
3699	* Internal: Open an image, constructing all necessary data structures.
3700	*/
3701	static int iscsiOpenImage(PISCSIIMAGE pImage, unsigned uOpenFlags)
3702	{
3703	int rc;
3704	char pszLUN = NULL, pszLUNInitial = NULL;
3705	bool fLunEncoded = false;
3706	uint32_t uWriteSplitDef = 0;
3707	uint32_t uTimeoutDef = 0;
3708	uint64_t uHostIPTmp = 0;
3709	bool fHostIPDef = 0;
3710	rc = RTStrToUInt32Full(s_iscsiConfigDefaultWriteSplit, 0, &uWriteSplitDef);
3711	AssertRC(rc);
3712	rc = RTStrToUInt32Full(s_iscsiConfigDefaultTimeout, 0, &uTimeoutDef);
3713	AssertRC(rc);
3714	rc = RTStrToUInt64Full(s_iscsiConfigDefaultHostIPStack, 0, &uHostIPTmp);
3715	AssertRC(rc);
3716	fHostIPDef = !!uHostIPTmp;
3717
3718	pImage->uOpenFlags = uOpenFlags;
3719
3720	/* Get error signalling interface. */
3721	pImage->pIfError = VDIfErrorGet(pImage->pVDIfsDisk);
3722
3723	/* Get TCP network stack interface. */
3724	pImage->pIfNet = VDIfTcpNetGet(pImage->pVDIfsImage);
3725	if (!pImage->pIfNet)
3726	{
3727	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_UNKNOWN_INTERFACE,
3728	RT_SRC_POS, N_("iSCSI: TCP network stack interface missing"));
3729	goto out;
3730	}
3731
3732	/* Get configuration interface. */
3733	pImage->pIfConfig = VDIfConfigGet(pImage->pVDIfsImage);
3734	if (!pImage->pIfConfig)
3735	{
3736	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_UNKNOWN_INTERFACE,
3737	RT_SRC_POS, N_("iSCSI: configuration interface missing"));
3738	goto out;
3739	}
3740
3741	/* Get I/O interface. */
3742	pImage->pIfIo = VDIfIoIntGet(pImage->pVDIfsImage);
3743	if (!pImage->pIfIo)
3744	{
3745	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_UNKNOWN_INTERFACE,
3746	RT_SRC_POS, N_("iSCSI: I/O interface missing"));
3747	goto out;
3748	}
3749
3750	/* This ISID will be adjusted later to make it unique on this host. */
3751	pImage->ISID = 0x800000000000ULL \| 0x001234560000ULL;
3752	pImage->cISCSIRetries = 10;
3753	pImage->state = ISCSISTATE_FREE;
3754	pImage->pvRecvPDUBuf = RTMemAlloc(ISCSI_RECV_PDU_BUFFER_SIZE);
3755	pImage->cbRecvPDUBuf = ISCSI_RECV_PDU_BUFFER_SIZE;
3756	if (pImage->pvRecvPDUBuf == NULL)
3757	{
3758	rc = VERR_NO_MEMORY;
3759	goto out;
3760	}
3761	pImage->Mutex = NIL_RTSEMMUTEX;
3762	pImage->MutexReqQueue = NIL_RTSEMMUTEX;
3763	rc = RTSemMutexCreate(&pImage->Mutex);
3764	if (RT_FAILURE(rc))
3765	goto out;
3766
3767	rc = RTSemMutexCreate(&pImage->MutexReqQueue);
3768	if (RT_FAILURE(rc))
3769	goto out;
3770
3771	/* Validate configuration, detect unknown keys. */
3772	if (!VDCFGAreKeysValid(pImage->pIfConfig,
3773	"TargetName\0InitiatorName\0LUN\0TargetAddress\0InitiatorUsername\0InitiatorSecret\0TargetUsername\0TargetSecret\0WriteSplit\0Timeout\0HostIPStack\0"))
3774	{
3775	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_UNKNOWN_CFG_VALUES, RT_SRC_POS, N_("iSCSI: configuration error: unknown configuration keys present"));
3776	goto out;
3777	}
3778
3779	/* Query the iSCSI upper level configuration. */
3780	rc = VDCFGQueryStringAlloc(pImage->pIfConfig,
3781	"TargetName", &pImage->pszTargetName);
3782	if (RT_FAILURE(rc))
3783	{
3784	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetName as string"));
3785	goto out;
3786	}
3787	rc = VDCFGQueryStringAlloc(pImage->pIfConfig,
3788	"InitiatorName", &pImage->pszInitiatorName);
3789	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
3790	{
3791	pImage->fAutomaticInitiatorName = true;
3792	rc = VINF_SUCCESS;
3793	}
3794	if (RT_FAILURE(rc))
3795	{
3796	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorName as string"));
3797	goto out;
3798	}
3799	rc = VDCFGQueryStringAllocDef(pImage->pIfConfig,
3800	"LUN", &pszLUN, s_iscsiConfigDefaultLUN);
3801	if (RT_FAILURE(rc))
3802	{
3803	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read LUN as string"));
3804	goto out;
3805	}
3806	pszLUNInitial = pszLUN;
3807	if (!strncmp(pszLUN, "enc", 3))
3808	{
3809	fLunEncoded = true;
3810	pszLUN += 3;
3811	}
3812	rc = RTStrToUInt64Full(pszLUN, 0, &pImage->LUN);
3813	if (RT_FAILURE(rc))
3814	{
3815	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to convert LUN to integer"));
3816	goto out;
3817	}
3818	if (!fLunEncoded)
3819	{
3820	if (pImage->LUN <= 255)
3821	{
3822	pImage->LUN = pImage->LUN << 48; /* uses peripheral device addressing method */
3823	}
3824	else if (pImage->LUN <= 16383)
3825	{
3826	pImage->LUN = (pImage->LUN << 48) \| RT_BIT_64(62); /* uses flat space addressing method */
3827	}
3828	else
3829	{
3830	rc = VERR_OUT_OF_RANGE;
3831	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: LUN number out of range (0-16383)"));
3832	goto out;
3833	}
3834	}
3835	rc = VDCFGQueryStringAlloc(pImage->pIfConfig,
3836	"TargetAddress", &pImage->pszTargetAddress);
3837	if (RT_FAILURE(rc))
3838	{
3839	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetAddress as string"));
3840	goto out;
3841	}
3842	pImage->pszInitiatorUsername = NULL;
3843	rc = VDCFGQueryStringAlloc(pImage->pIfConfig,
3844	"InitiatorUsername",
3845	&pImage->pszInitiatorUsername);
3846	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
3847	rc = VINF_SUCCESS;
3848	if (RT_FAILURE(rc))
3849	{
3850	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorUsername as string"));
3851	goto out;
3852	}
3853	pImage->pbInitiatorSecret = NULL;
3854	pImage->cbInitiatorSecret = 0;
3855	rc = VDCFGQueryBytesAlloc(pImage->pIfConfig,
3856	"InitiatorSecret",
3857	(void **)&pImage->pbInitiatorSecret,
3858	&pImage->cbInitiatorSecret);
3859	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
3860	rc = VINF_SUCCESS;
3861	if (RT_FAILURE(rc))
3862	{
3863	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read InitiatorSecret as byte string"));
3864	goto out;
3865	}
3866	pImage->pszTargetUsername = NULL;
3867	rc = VDCFGQueryStringAlloc(pImage->pIfConfig,
3868	"TargetUsername",
3869	&pImage->pszTargetUsername);
3870	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
3871	rc = VINF_SUCCESS;
3872	if (RT_FAILURE(rc))
3873	{
3874	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetUsername as string"));
3875	goto out;
3876	}
3877	pImage->pbTargetSecret = NULL;
3878	pImage->cbTargetSecret = 0;
3879	rc = VDCFGQueryBytesAlloc(pImage->pIfConfig,
3880	"TargetSecret", (void **)&pImage->pbTargetSecret,
3881	&pImage->cbTargetSecret);
3882	if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_NO_PARENT)
3883	rc = VINF_SUCCESS;
3884	if (RT_FAILURE(rc))
3885	{
3886	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read TargetSecret as byte string"));
3887	goto out;
3888	}
3889	rc = VDCFGQueryU32Def(pImage->pIfConfig,
3890	"WriteSplit", &pImage->cbWriteSplit,
3891	uWriteSplitDef);
3892	if (RT_FAILURE(rc))
3893	{
3894	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read WriteSplit as U32"));
3895	goto out;
3896	}
3897
3898	pImage->pszHostname = NULL;
3899	pImage->uPort = 0;
3900	pImage->Socket = NIL_VDSOCKET;
3901	/* Query the iSCSI lower level configuration. */
3902	rc = VDCFGQueryU32Def(pImage->pIfConfig,
3903	"Timeout", &pImage->uReadTimeout,
3904	uTimeoutDef);
3905	if (RT_FAILURE(rc))
3906	{
3907	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read Timeout as U32"));
3908	goto out;
3909	}
3910	rc = VDCFGQueryBoolDef(pImage->pIfConfig,
3911	"HostIPStack", &pImage->fHostIP,
3912	fHostIPDef);
3913	if (RT_FAILURE(rc))
3914	{
3915	rc = vdIfError(pImage->pIfError, rc, RT_SRC_POS, N_("iSCSI: configuration error: failed to read HostIPStack as boolean"));
3916	goto out;
3917	}
3918
3919	/* Don't actually establish iSCSI transport connection if this is just an
3920	* open to query the image information and the host IP stack isn't used.
3921	* Even trying is rather useless, as in this context the InTnet IP stack
3922	* isn't present. Returning dummies is the best possible result anyway. */
3923	if ((uOpenFlags & VD_OPEN_FLAGS_INFO) && !pImage->fHostIP)
3924	{
3925	LogFunc(("Not opening the transport connection as IntNet IP stack is not available. Will return dummies\n"));
3926	goto out;
3927	}
3928
3929	memset(pImage->aCmdsWaiting, 0, sizeof(pImage->aCmdsWaiting));
3930	pImage->cbRecvPDUResidual = 0;
3931
3932	/* Create the socket structure. */
3933	rc = pImage->pIfNet->pfnSocketCreate(VD_INTERFACETCPNET_CONNECT_EXTENDED_SELECT,
3934	&pImage->Socket);
3935	if (RT_SUCCESS(rc))
3936	{
3937	pImage->fExtendedSelectSupported = true;
3938	pImage->fRunning = true;
3939	rc = RTThreadCreate(&pImage->hThreadIo, iscsiIoThreadWorker, pImage, 0,
3940	RTTHREADTYPE_IO, RTTHREADFLAGS_WAITABLE, "iSCSI-Io");
3941	if (RT_FAILURE(rc))
3942	{
3943	LogFunc(("Creating iSCSI I/O thread failed rc=%Rrc\n", rc));
3944	goto out;
3945	}
3946	}
3947	else if (rc == VERR_NOT_SUPPORTED)
3948	{
3949	/* Async I/O is not supported without extended select. */
3950	if ((uOpenFlags & VD_OPEN_FLAGS_ASYNC_IO))
3951	{
3952	LogFunc(("Extended select is not supported by the interface but async I/O is requested -> %Rrc\n", rc));
3953	goto out;
3954	}
3955	else
3956	{
3957	pImage->fExtendedSelectSupported = false;
3958	rc = pImage->pIfNet->pfnSocketCreate(0, &pImage->Socket);
3959	if (RT_FAILURE(rc))
3960	{
3961	LogFunc(("Creating socket failed -> %Rrc\n", rc));
3962	goto out;
3963	}
3964	}
3965	}
3966	else
3967	{
3968	LogFunc(("Creating socket failed -> %Rrc\n", rc));
3969	goto out;
3970	}
3971
3972	/*
3973	* Attach to the iSCSI target. This implicitly establishes the iSCSI
3974	* transport connection.
3975	*/
3976	rc = iscsiExecSync(pImage, iscsiAttach, pImage);
3977	if (RT_FAILURE(rc))
3978	{
3979	LogRel(("iSCSI: could not open target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
3980	goto out;
3981	}
3982	LogFlowFunc(("target '%s' opened successfully\n", pImage->pszTargetName));
3983
3984	SCSIREQ sr;
3985	RTSGSEG DataSeg;
3986	uint8_t sense[96];
3987	uint8_t data8[8];
3988	uint8_t data12[12];
3989
3990	/*
3991	* Inquire available LUNs - purely dummy request.
3992	*/
3993	uint8_t CDB_rlun[12];
3994	uint8_t rlundata[16];
3995	CDB_rlun[0] = SCSI_REPORT_LUNS;
3996	CDB_rlun[1] = 0; /* reserved */
3997	CDB_rlun[2] = 0; /* reserved */
3998	CDB_rlun[3] = 0; /* reserved */
3999	CDB_rlun[4] = 0; /* reserved */
4000	CDB_rlun[5] = 0; /* reserved */
4001	CDB_rlun[6] = sizeof(rlundata) >> 24;
4002	CDB_rlun[7] = (sizeof(rlundata) >> 16) & 0xff;
4003	CDB_rlun[8] = (sizeof(rlundata) >> 8) & 0xff;
4004	CDB_rlun[9] = sizeof(rlundata) & 0xff;
4005	CDB_rlun[10] = 0; /* reserved */
4006	CDB_rlun[11] = 0; /* control */
4007
4008	DataSeg.pvSeg = rlundata;
4009	DataSeg.cbSeg = sizeof(rlundata);
4010
4011	sr.enmXfer = SCSIXFER_FROM_TARGET;
4012	sr.cbCDB = sizeof(CDB_rlun);
4013	sr.pvCDB = CDB_rlun;
4014	sr.cbI2TData = 0;
4015	sr.paI2TSegs = NULL;
4016	sr.cI2TSegs = 0;
4017	sr.cbT2IData = DataSeg.cbSeg;
4018	sr.paT2ISegs = &DataSeg;
4019	sr.cT2ISegs = 1;
4020	sr.cbSense = sizeof(sense);
4021	sr.pvSense = sense;
4022
4023	rc = iscsiCommandSync(pImage, &sr, false, VERR_INVALID_STATE);
4024	if (RT_FAILURE(rc))
4025	{
4026	LogRel(("iSCSI: Could not get LUN info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4027	return rc;
4028	}
4029
4030	/*
4031	* Inquire device characteristics - no tapes, scanners etc., please.
4032	*/
4033	uint8_t CDB_inq[6];
4034	CDB_inq[0] = SCSI_INQUIRY;
4035	CDB_inq[1] = 0; /* reserved */
4036	CDB_inq[2] = 0; /* reserved */
4037	CDB_inq[3] = 0; /* reserved */
4038	CDB_inq[4] = sizeof(data8);
4039	CDB_inq[5] = 0; /* control */
4040
4041	DataSeg.pvSeg = data8;
4042	DataSeg.cbSeg = sizeof(data8);
4043
4044	sr.enmXfer = SCSIXFER_FROM_TARGET;
4045	sr.cbCDB = sizeof(CDB_inq);
4046	sr.pvCDB = CDB_inq;
4047	sr.cbI2TData = 0;
4048	sr.paI2TSegs = NULL;
4049	sr.cI2TSegs = 0;
4050	sr.cbT2IData = DataSeg.cbSeg;
4051	sr.paT2ISegs = &DataSeg;
4052	sr.cT2ISegs = 1;
4053	sr.cbSense = sizeof(sense);
4054	sr.pvSense = sense;
4055
4056	rc = iscsiCommandSync(pImage, &sr, true /* fRetry */, VERR_INVALID_STATE);
4057	if (RT_SUCCESS(rc))
4058	{
4059	uint8_t devType = (sr.cbT2IData > 0) ? data8[0] & SCSI_DEVTYPE_MASK : 255;
4060	if (devType != SCSI_DEVTYPE_DISK)
4061	{
4062	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4063	RT_SRC_POS, N_("iSCSI: target address %s, target name %s, SCSI LUN %lld reports device type=%u"),
4064	pImage->pszTargetAddress, pImage->pszTargetName,
4065	pImage->LUN, devType);
4066	LogRel(("iSCSI: Unsupported SCSI peripheral device type %d for target %s\n", devType & SCSI_DEVTYPE_MASK, pImage->pszTargetName));
4067	goto out;
4068	}
4069	uint8_t uCmdQueue = (sr.cbT2IData >= 8) ? data8[7] & SCSI_INQUIRY_CMDQUE_MASK : 0;
4070	if (uCmdQueue > 0)
4071	pImage->fCmdQueuingSupported = true;
4072	else if (uOpenFlags & VD_OPEN_FLAGS_ASYNC_IO)
4073	{
4074	rc = VERR_NOT_SUPPORTED;
4075	goto out;
4076	}
4077
4078	LogRel(("iSCSI: target address %s, target name %s, %s command queuing\n",
4079	pImage->pszTargetAddress, pImage->pszTargetName,
4080	pImage->fCmdQueuingSupported ? "supports" : "doesn't support"));
4081	}
4082	else
4083	{
4084	LogRel(("iSCSI: Could not get INQUIRY info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4085	goto out;
4086	}
4087
4088	/*
4089	* Query write disable bit in the device specific parameter entry in the
4090	* mode parameter header. Refuse read/write opening of read only disks.
4091	*/
4092
4093	uint8_t CDB_ms[6];
4094	uint8_t data4[4];
4095	CDB_ms[0] = SCSI_MODE_SENSE_6;
4096	CDB_ms[1] = 0; /* dbd=0/reserved */
4097	CDB_ms[2] = 0x3f; /* pc=0/page code=0x3f, ask for all pages */
4098	CDB_ms[3] = 0; /* subpage code=0, return everything in page_0 format */
4099	CDB_ms[4] = sizeof(data4); /* allocation length=4 */
4100	CDB_ms[5] = 0; /* control */
4101
4102	DataSeg.pvSeg = data4;
4103	DataSeg.cbSeg = sizeof(data4);
4104
4105	sr.enmXfer = SCSIXFER_FROM_TARGET;
4106	sr.cbCDB = sizeof(CDB_ms);
4107	sr.pvCDB = CDB_ms;
4108	sr.cbI2TData = 0;
4109	sr.paI2TSegs = NULL;
4110	sr.cI2TSegs = 0;
4111	sr.cbT2IData = DataSeg.cbSeg;
4112	sr.paT2ISegs = &DataSeg;
4113	sr.cT2ISegs = 1;
4114	sr.cbSense = sizeof(sense);
4115	sr.pvSense = sense;
4116
4117	rc = iscsiCommandSync(pImage, &sr, true /* fRetry */, VERR_INVALID_STATE);
4118	if (RT_SUCCESS(rc))
4119	{
4120	if (!(uOpenFlags & VD_OPEN_FLAGS_READONLY) && data4[2] & 0x80)
4121	{
4122	rc = VERR_VD_IMAGE_READ_ONLY;
4123	goto out;
4124	}
4125	}
4126	else
4127	{
4128	LogRel(("iSCSI: Could not get MODE SENSE info for target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4129	goto out;
4130	}
4131
4132	/*
4133	* Determine sector size and capacity of the volume immediately.
4134	*/
4135	uint8_t CDB_cap[16];
4136
4137	RT_ZERO(data12);
4138	RT_ZERO(CDB_cap);
4139	CDB_cap[0] = SCSI_SERVICE_ACTION_IN_16;
4140	CDB_cap[1] = SCSI_SVC_ACTION_IN_READ_CAPACITY_16; /* subcommand */
4141	CDB_cap[10+3] = sizeof(data12); /* allocation length (dword) */
4142
4143	DataSeg.pvSeg = data12;
4144	DataSeg.cbSeg = sizeof(data12);
4145
4146	sr.enmXfer = SCSIXFER_FROM_TARGET;
4147	sr.cbCDB = sizeof(CDB_cap);
4148	sr.pvCDB = CDB_cap;
4149	sr.cbI2TData = 0;
4150	sr.paI2TSegs = NULL;
4151	sr.cI2TSegs = 0;
4152	sr.cbT2IData = DataSeg.cbSeg;
4153	sr.paT2ISegs = &DataSeg;
4154	sr.cT2ISegs = 1;
4155	sr.cbSense = sizeof(sense);
4156	sr.pvSense = sense;
4157
4158	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4159	if ( RT_SUCCESS(rc)
4160	&& sr.status == SCSI_STATUS_OK)
4161	{
4162	pImage->cVolume = RT_BE2H_U64((uint64_t )&data12[0]);
4163	pImage->cVolume++;
4164	pImage->cbSector = RT_BE2H_U32((uint32_t )&data12[8]);
4165	pImage->cbSize = pImage->cVolume * pImage->cbSector;
4166	if (pImage->cVolume == 0 \|\| pImage->cbSector != 512 \|\| pImage->cbSize < pImage->cVolume)
4167	{
4168	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4169	RT_SRC_POS, N_("iSCSI: target address %s, target name %s, SCSI LUN %lld reports media sector count=%llu sector size=%u"),
4170	pImage->pszTargetAddress, pImage->pszTargetName,
4171	pImage->LUN, pImage->cVolume, pImage->cbSector);
4172	}
4173	}
4174	else
4175	{
4176	uint8_t CDB_capfb[10];
4177
4178	RT_ZERO(data8);
4179	CDB_capfb[0] = SCSI_READ_CAPACITY;
4180	CDB_capfb[1] = 0; /* reserved */
4181	CDB_capfb[2] = 0; /* reserved */
4182	CDB_capfb[3] = 0; /* reserved */
4183	CDB_capfb[4] = 0; /* reserved */
4184	CDB_capfb[5] = 0; /* reserved */
4185	CDB_capfb[6] = 0; /* reserved */
4186	CDB_capfb[7] = 0; /* reserved */
4187	CDB_capfb[8] = 0; /* reserved */
4188	CDB_capfb[9] = 0; /* control */
4189
4190	DataSeg.pvSeg = data8;
4191	DataSeg.cbSeg = sizeof(data8);
4192
4193	sr.enmXfer = SCSIXFER_FROM_TARGET;
4194	sr.cbCDB = sizeof(CDB_capfb);
4195	sr.pvCDB = CDB_capfb;
4196	sr.cbI2TData = 0;
4197	sr.paI2TSegs = NULL;
4198	sr.cI2TSegs = 0;
4199	sr.cbT2IData = DataSeg.cbSeg;
4200	sr.paT2ISegs = &DataSeg;
4201	sr.cT2ISegs = 1;
4202	sr.cbSense = sizeof(sense);
4203	sr.pvSense = sense;
4204
4205	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4206	if (RT_SUCCESS(rc))
4207	{
4208	pImage->cVolume = (data8[0] << 24) \| (data8[1] << 16) \| (data8[2] << 8) \| data8[3];
4209	pImage->cVolume++;
4210	pImage->cbSector = (data8[4] << 24) \| (data8[5] << 16) \| (data8[6] << 8) \| data8[7];
4211	pImage->cbSize = pImage->cVolume * pImage->cbSector;
4212	if (pImage->cVolume == 0 \|\| pImage->cbSector != 512)
4213	{
4214	rc = vdIfError(pImage->pIfError, VERR_VD_ISCSI_INVALID_TYPE,
4215	RT_SRC_POS, N_("iSCSI: fallback capacity detectio for target address %s, target name %s, SCSI LUN %lld reports media sector count=%llu sector size=%u"),
4216	pImage->pszTargetAddress, pImage->pszTargetName,
4217	pImage->LUN, pImage->cVolume, pImage->cbSector);
4218	}
4219	}
4220	else
4221	{
4222	LogRel(("iSCSI: Could not determine capacity of target %s, rc=%Rrc\n", pImage->pszTargetName, rc));
4223	goto out;
4224	}
4225	}
4226
4227	/*
4228	* Check the read and write cache bits.
4229	* Try to enable the cache if it is disabled.
4230	*
4231	* We already checked that this is a block access device. No need
4232	* to do it again.
4233	*/
4234	uint8_t aCachingModePage[32];
4235	uint8_t aCDBModeSense6[6];
4236
4237	memset(aCachingModePage, '\0', sizeof(aCachingModePage));
4238	aCDBModeSense6[0] = SCSI_MODE_SENSE_6;
4239	aCDBModeSense6[1] = 0;
4240	aCDBModeSense6[2] = (0x00 << 6) \| (0x08 & 0x3f); /* Current values and caching mode page */
4241	aCDBModeSense6[3] = 0; /* Sub page code. */
4242	aCDBModeSense6[4] = sizeof(aCachingModePage) & 0xff;
4243	aCDBModeSense6[5] = 0;
4244
4245	DataSeg.pvSeg = aCachingModePage;
4246	DataSeg.cbSeg = sizeof(aCachingModePage);
4247
4248	sr.enmXfer = SCSIXFER_FROM_TARGET;
4249	sr.cbCDB = sizeof(aCDBModeSense6);
4250	sr.pvCDB = aCDBModeSense6;
4251	sr.cbI2TData = 0;
4252	sr.paI2TSegs = NULL;
4253	sr.cI2TSegs = 0;
4254	sr.cbT2IData = DataSeg.cbSeg;
4255	sr.paT2ISegs = &DataSeg;
4256	sr.cT2ISegs = 1;
4257	sr.cbSense = sizeof(sense);
4258	sr.pvSense = sense;
4259	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4260	if ( RT_SUCCESS(rc)
4261	&& (sr.status == SCSI_STATUS_OK)
4262	&& (aCachingModePage[0] >= 15)
4263	&& (aCachingModePage[4 + aCachingModePage[3]] & 0x3f) == 0x08
4264	&& (aCachingModePage[4 + aCachingModePage[3] + 1] > 3))
4265	{
4266	uint32_t Offset = 4 + aCachingModePage[3];
4267	/*
4268	* Check if the read and/or the write cache is disabled.
4269	* The write cache is disabled if bit 2 (WCE) is zero and
4270	* the read cache is disabled if bit 0 (RCD) is set.
4271	*/
4272	if (!ASMBitTest(&aCachingModePage[Offset + 2], 2) \|\| ASMBitTest(&aCachingModePage[Offset + 2], 0))
4273	{
4274	/*
4275	* Write Cache Enable (WCE) bit is zero or the Read Cache Disable (RCD) is one
4276	* So one of the caches is disabled. Enable both caches.
4277	* The rest is unchanged.
4278	*/
4279	ASMBitSet(&aCachingModePage[Offset + 2], 2);
4280	ASMBitClear(&aCachingModePage[Offset + 2], 0);
4281
4282	uint8_t aCDBCaching[6];
4283	aCDBCaching[0] = SCSI_MODE_SELECT_6;
4284	aCDBCaching[1] = 0; /* Don't write the page into NV RAM. */
4285	aCDBCaching[2] = 0;
4286	aCDBCaching[3] = 0;
4287	aCDBCaching[4] = sizeof(aCachingModePage) & 0xff;
4288	aCDBCaching[5] = 0;
4289
4290	DataSeg.pvSeg = aCachingModePage;
4291	DataSeg.cbSeg = sizeof(aCachingModePage);
4292
4293	sr.enmXfer = SCSIXFER_TO_TARGET;
4294	sr.cbCDB = sizeof(aCDBCaching);
4295	sr.pvCDB = aCDBCaching;
4296	sr.cbI2TData = DataSeg.cbSeg;
4297	sr.paI2TSegs = &DataSeg;
4298	sr.cI2TSegs = 1;
4299	sr.cbT2IData = 0;
4300	sr.paT2ISegs = NULL;
4301	sr.cT2ISegs = 0;
4302	sr.cbSense = sizeof(sense);
4303	sr.pvSense = sense;
4304	sr.status = 0;
4305	rc = iscsiCommandSync(pImage, &sr, false /* fRetry */, VINF_SUCCESS);
4306	if ( RT_SUCCESS(rc)
4307	&& (sr.status == SCSI_STATUS_OK))
4308	{
4309	LogRel(("iSCSI: Enabled read and write cache of target %s\n", pImage->pszTargetName));
4310	}
4311	else
4312	{
4313	/* Log failures but continue. */
4314	LogRel(("iSCSI: Could not enable read and write cache of target %s, rc=%Rrc status=%#x\n",
4315	pImage->pszTargetName, rc, sr.status));
4316	LogRel(("iSCSI: Sense:\n%.*Rhxd\n", sr.cbSense, sense));
4317	rc = VINF_SUCCESS;
4318	}
4319	}
4320	}
4321	else
4322	{
4323	/* Log errors but continue. */
4324	LogRel(("iSCSI: Could not check write cache of target %s, rc=%Rrc, got mode page %#x\n", pImage->pszTargetName, rc,aCachingModePage[0] & 0x3f));
4325	LogRel(("iSCSI: Sense:\n%.*Rhxd\n", sr.cbSense, sense));
4326	rc = VINF_SUCCESS;
4327	}
4328
4329	out:
4330	if (RT_FAILURE(rc))
4331	iscsiFreeImage(pImage, false);
4332	return rc;
4333	}
4334
4335
4336	/** @copydoc VBOXHDDBACKEND::pfnCheckIfValid */
4337	static int iscsiCheckIfValid(const char *pszFilename, PVDINTERFACE pVDIfsDisk,
4338	PVDINTERFACE pVDIfsImage, VDTYPE *penmType)
4339	{
4340	LogFlowFunc(("pszFilename=\"%s\"\n", pszFilename));
4341
4342	/* iSCSI images can't be checked for validity this way, as the filename
4343	* just can't supply enough configuration information. */
4344	int rc = VERR_VD_ISCSI_INVALID_HEADER;
4345
4346	LogFlowFunc(("returns %Rrc\n", rc));
4347	return rc;
4348	}
4349
4350	/** @copydoc VBOXHDDBACKEND::pfnOpen */
4351	static int iscsiOpen(const char *pszFilename, unsigned uOpenFlags,
4352	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
4353	VDTYPE enmType, void **ppBackendData)
4354	{
4355	LogFlowFunc(("pszFilename=\"%s\" uOpenFlags=%#x pVDIfsDisk=%#p pVDIfsImage=%#p ppBackendData=%#p\n", pszFilename, uOpenFlags, pVDIfsDisk, pVDIfsImage, ppBackendData));
4356	int rc;
4357	PISCSIIMAGE pImage;
4358
4359	/* Check open flags. All valid flags are supported. */
4360	if (uOpenFlags & ~VD_OPEN_FLAGS_MASK)
4361	{
4362	rc = VERR_INVALID_PARAMETER;
4363	goto out;
4364	}
4365
4366	/* Check remaining arguments. */
4367	if ( !VALID_PTR(pszFilename)
4368	\|\| !*pszFilename
4369	\|\| strchr(pszFilename, '"'))
4370	{
4371	rc = VERR_INVALID_PARAMETER;
4372	goto out;
4373	}
4374
4375	pImage = (PISCSIIMAGE)RTMemAllocZ(sizeof(ISCSIIMAGE));
4376	if (!pImage)
4377	{
4378	rc = VERR_NO_MEMORY;
4379	goto out;
4380	}
4381
4382	pImage->pszFilename = pszFilename;
4383	pImage->pszInitiatorName = NULL;
4384	pImage->pszTargetName = NULL;
4385	pImage->pszTargetAddress = NULL;
4386	pImage->pszInitiatorUsername = NULL;
4387	pImage->pbInitiatorSecret = NULL;
4388	pImage->pszTargetUsername = NULL;
4389	pImage->pbTargetSecret = NULL;
4390	pImage->paCurrReq = NULL;
4391	pImage->pvRecvPDUBuf = NULL;
4392	pImage->pszHostname = NULL;
4393	pImage->pVDIfsDisk = pVDIfsDisk;
4394	pImage->pVDIfsImage = pVDIfsImage;
4395	pImage->cLogRelErrors = 0;
4396
4397	rc = iscsiOpenImage(pImage, uOpenFlags);
4398	if (RT_SUCCESS(rc))
4399	{
4400	LogFlowFunc(("target %s cVolume %d, cbSector %d\n", pImage->pszTargetName, pImage->cVolume, pImage->cbSector));
4401	LogRel(("iSCSI: target address %s, target name %s, SCSI LUN %lld\n", pImage->pszTargetAddress, pImage->pszTargetName, pImage->LUN));
4402	*ppBackendData = pImage;
4403	}
4404	else
4405	RTMemFree(pImage);
4406
4407	out:
4408	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
4409	return rc;
4410	}
4411
4412	/** @copydoc VBOXHDDBACKEND::pfnCreate */
4413	static int iscsiCreate(const char *pszFilename, uint64_t cbSize,
4414	unsigned uImageFlags, const char *pszComment,
4415	PCVDGEOMETRY pPCHSGeometry, PCVDGEOMETRY pLCHSGeometry,
4416	PCRTUUID pUuid, unsigned uOpenFlags,
4417	unsigned uPercentStart, unsigned uPercentSpan,
4418	PVDINTERFACE pVDIfsDisk, PVDINTERFACE pVDIfsImage,
4419	PVDINTERFACE pVDIfsOperation, void **ppBackendData)
4420	{
4421	LogFlowFunc(("pszFilename=\"%s\" cbSize=%llu uImageFlags=%#x pszComment=\"%s\" pPCHSGeometry=%#p pLCHSGeometry=%#p Uuid=%RTuuid uOpenFlags=%#x uPercentStart=%u uPercentSpan=%u pVDIfsDisk=%#p pVDIfsImage=%#p pVDIfsOperation=%#p ppBackendData=%#p", pszFilename, cbSize, uImageFlags, pszComment, pPCHSGeometry, pLCHSGeometry, pUuid, uOpenFlags, uPercentStart, uPercentSpan, pVDIfsDisk, pVDIfsImage, pVDIfsOperation, ppBackendData));
4422	int rc = VERR_NOT_SUPPORTED;
4423
4424	LogFlowFunc(("returns %Rrc (pBackendData=%#p)\n", rc, *ppBackendData));
4425	return rc;
4426	}
4427
4428	/** @copydoc VBOXHDDBACKEND::pfnClose */
4429	static int iscsiClose(void *pBackendData, bool fDelete)
4430	{
4431	LogFlowFunc(("pBackendData=%#p fDelete=%d\n", pBackendData, fDelete));
4432	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4433	int rc;
4434
4435	Assert(!fDelete); /* This flag is unsupported. */
4436
4437	rc = iscsiFreeImage(pImage, fDelete);
4438	RTMemFree(pImage);
4439
4440	LogFlowFunc(("returns %Rrc\n", rc));
4441	return rc;
4442	}
4443
4444	/** @copydoc VBOXHDDBACKEND::pfnRead */
4445	static int iscsiRead(void pBackendData, uint64_t uOffset, void pvBuf,
4446	size_t cbToRead, size_t *pcbActuallyRead)
4447	{
4448	/** @todo reinstate logging of the target everywhere - dropped temporarily */
4449	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToRead=%zu pcbActuallyRead=%#p\n", pBackendData, uOffset, pvBuf, cbToRead, pcbActuallyRead));
4450	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4451	uint64_t lba;
4452	uint16_t tls;
4453	int rc;
4454
4455	Assert(pImage);
4456	Assert(uOffset % 512 == 0);
4457	Assert(cbToRead % 512 == 0);
4458
4459	Assert(pImage->cbSector);
4460	AssertPtr(pvBuf);
4461
4462	if ( uOffset + cbToRead > pImage->cbSize
4463	\|\| cbToRead == 0)
4464	{
4465	rc = VERR_INVALID_PARAMETER;
4466	goto out;
4467	}
4468
4469	/*
4470	* Clip read size to a value which is supported by the target.
4471	*/
4472	cbToRead = RT_MIN(cbToRead, pImage->cbRecvDataLength);
4473
4474	lba = uOffset / pImage->cbSector;
4475	tls = (uint16_t)(cbToRead / pImage->cbSector);
4476	SCSIREQ sr;
4477	RTSGSEG T2ISeg;
4478	size_t cbCDB;
4479	uint8_t abCDB[16];
4480	uint8_t sense[96];
4481
4482	if (pImage->cVolume < _4G)
4483	{
4484	cbCDB = 10;
4485	abCDB[0] = SCSI_READ_10;
4486	abCDB[1] = 0; /* reserved */
4487	abCDB[2] = (lba >> 24) & 0xff;
4488	abCDB[3] = (lba >> 16) & 0xff;
4489	abCDB[4] = (lba >> 8) & 0xff;
4490	abCDB[5] = lba & 0xff;
4491	abCDB[6] = 0; /* reserved */
4492	abCDB[7] = (tls >> 8) & 0xff;
4493	abCDB[8] = tls & 0xff;
4494	abCDB[9] = 0; /* control */
4495	}
4496	else
4497	{
4498	cbCDB = 16;
4499	abCDB[0] = SCSI_READ_16;
4500	abCDB[1] = 0; /* reserved */
4501	abCDB[2] = (lba >> 56) & 0xff;
4502	abCDB[3] = (lba >> 48) & 0xff;
4503	abCDB[4] = (lba >> 40) & 0xff;
4504	abCDB[5] = (lba >> 32) & 0xff;
4505	abCDB[6] = (lba >> 24) & 0xff;
4506	abCDB[7] = (lba >> 16) & 0xff;
4507	abCDB[8] = (lba >> 8) & 0xff;
4508	abCDB[9] = lba & 0xff;
4509	abCDB[10] = 0; /* tls unused */
4510	abCDB[11] = 0; /* tls unused */
4511	abCDB[12] = (tls >> 8) & 0xff;
4512	abCDB[13] = tls & 0xff;
4513	abCDB[14] = 0; /* reserved */
4514	abCDB[15] = 0; /* reserved */
4515	}
4516
4517	T2ISeg.pvSeg = pvBuf;
4518	T2ISeg.cbSeg = cbToRead;
4519
4520	sr.enmXfer = SCSIXFER_FROM_TARGET;
4521	sr.cbCDB = cbCDB;
4522	sr.pvCDB = abCDB;
4523	sr.cbI2TData = 0;
4524	sr.paI2TSegs = NULL;
4525	sr.cI2TSegs = 0;
4526	sr.cbT2IData = cbToRead;
4527	sr.paT2ISegs = &T2ISeg;
4528	sr.cT2ISegs = 1;
4529	sr.cbSense = sizeof(sense);
4530	sr.pvSense = sense;
4531
4532	rc = iscsiCommandSync(pImage, &sr, true, VERR_READ_ERROR);
4533	if (RT_FAILURE(rc))
4534	{
4535	LogFlow(("iscsiCommandSync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
4536	*pcbActuallyRead = 0;
4537	}
4538	else
4539	*pcbActuallyRead = sr.cbT2IData;
4540
4541	out:
4542	LogFlowFunc(("returns %Rrc\n", rc));
4543	return rc;
4544	}
4545
4546	/** @copydoc VBOXHDDBACKEND::pfnWrite */
4547	static int iscsiWrite(void pBackendData, uint64_t uOffset, const void pvBuf,
4548	size_t cbToWrite, size_t *pcbWriteProcess,
4549	size_t pcbPreRead, size_t pcbPostRead, unsigned fWrite)
4550	{
4551	LogFlowFunc(("pBackendData=%#p uOffset=%llu pvBuf=%#p cbToWrite=%zu pcbWriteProcess=%#p pcbPreRead=%#p pcbPostRead=%#p\n", pBackendData, uOffset, pvBuf, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead));
4552	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4553	uint64_t lba;
4554	uint16_t tls;
4555	int rc;
4556
4557	Assert(pImage);
4558	Assert(uOffset % 512 == 0);
4559	Assert(cbToWrite % 512 == 0);
4560
4561	Assert(pImage->cbSector);
4562	Assert(pvBuf);
4563
4564	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
4565	{
4566	rc = VERR_VD_IMAGE_READ_ONLY;
4567	goto out;
4568	}
4569
4570	*pcbPreRead = 0;
4571	*pcbPostRead = 0;
4572
4573	/*
4574	* Clip write size to a value which is supported by the target.
4575	*/
4576	cbToWrite = RT_MIN(cbToWrite, pImage->cbSendDataLength);
4577
4578	lba = uOffset / pImage->cbSector;
4579	tls = (uint16_t)(cbToWrite / pImage->cbSector);
4580	SCSIREQ sr;
4581	RTSGSEG I2TSeg;
4582	size_t cbCDB;
4583	uint8_t abCDB[16];
4584	uint8_t sense[96];
4585
4586	if (pImage->cVolume < _4G)
4587	{
4588	cbCDB = 10;
4589	abCDB[0] = SCSI_WRITE_10;
4590	abCDB[1] = 0; /* reserved */
4591	abCDB[2] = (lba >> 24) & 0xff;
4592	abCDB[3] = (lba >> 16) & 0xff;
4593	abCDB[4] = (lba >> 8) & 0xff;
4594	abCDB[5] = lba & 0xff;
4595	abCDB[6] = 0; /* reserved */
4596	abCDB[7] = (tls >> 8) & 0xff;
4597	abCDB[8] = tls & 0xff;
4598	abCDB[9] = 0; /* control */
4599	}
4600	else
4601	{
4602	cbCDB = 16;
4603	abCDB[0] = SCSI_WRITE_16;
4604	abCDB[1] = 0; /* reserved */
4605	abCDB[2] = (lba >> 56) & 0xff;
4606	abCDB[3] = (lba >> 48) & 0xff;
4607	abCDB[4] = (lba >> 40) & 0xff;
4608	abCDB[5] = (lba >> 32) & 0xff;
4609	abCDB[6] = (lba >> 24) & 0xff;
4610	abCDB[7] = (lba >> 16) & 0xff;
4611	abCDB[8] = (lba >> 8) & 0xff;
4612	abCDB[9] = lba & 0xff;
4613	abCDB[10] = 0; /* tls unused */
4614	abCDB[11] = 0; /* tls unused */
4615	abCDB[12] = (tls >> 8) & 0xff;
4616	abCDB[13] = tls & 0xff;
4617	abCDB[14] = 0; /* reserved */
4618	abCDB[15] = 0; /* reserved */
4619	}
4620
4621	I2TSeg.pvSeg = (void *)pvBuf;
4622	I2TSeg.cbSeg = cbToWrite;
4623
4624	sr.enmXfer = SCSIXFER_TO_TARGET;
4625	sr.cbCDB = cbCDB;
4626	sr.pvCDB = abCDB;
4627	sr.cbI2TData = cbToWrite;
4628	sr.paI2TSegs = &I2TSeg;
4629	sr.cI2TSegs = 1;
4630	sr.cbT2IData = 0;
4631	sr.paT2ISegs = NULL;
4632	sr.cT2ISegs = 0;
4633	sr.cbSense = sizeof(sense);
4634	sr.pvSense = sense;
4635
4636	rc = iscsiCommandSync(pImage, &sr, true, VERR_WRITE_ERROR);
4637	if (RT_FAILURE(rc))
4638	{
4639	LogFlow(("iscsiCommandSync(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
4640	*pcbWriteProcess = 0;
4641	}
4642	else
4643	*pcbWriteProcess = cbToWrite;
4644
4645	out:
4646	LogFlowFunc(("returns %Rrc\n", rc));
4647	return rc;
4648	}
4649
4650	/** @copydoc VBOXHDDBACKEND::pfnFlush */
4651	static int iscsiFlush(void *pBackendData)
4652	{
4653	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4654	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4655	int rc;
4656
4657	Assert(pImage);
4658
4659	SCSIREQ sr;
4660	uint8_t abCDB[10];
4661	uint8_t sense[96];
4662
4663	abCDB[0] = SCSI_SYNCHRONIZE_CACHE;
4664	abCDB[1] = 0; /* reserved */
4665	abCDB[2] = 0; /* LBA 0 */
4666	abCDB[3] = 0; /* LBA 0 */
4667	abCDB[4] = 0; /* LBA 0 */
4668	abCDB[5] = 0; /* LBA 0 */
4669	abCDB[6] = 0; /* reserved */
4670	abCDB[7] = 0; /* transfer everything to disk */
4671	abCDB[8] = 0; /* transfer everything to disk */
4672	abCDB[9] = 0; /* control */
4673
4674	sr.enmXfer = SCSIXFER_NONE;
4675	sr.cbCDB = sizeof(abCDB);
4676	sr.pvCDB = abCDB;
4677	sr.cbI2TData = 0;
4678	sr.paI2TSegs = NULL;
4679	sr.cI2TSegs = 0;
4680	sr.cbT2IData = 0;
4681	sr.paT2ISegs = NULL;
4682	sr.cT2ISegs = 0;
4683	sr.cbSense = sizeof(sense);
4684	sr.pvSense = sense;
4685
4686	rc = iscsiCommandSync(pImage, &sr, false, VINF_SUCCESS);
4687	if (RT_FAILURE(rc))
4688	AssertMsgFailed(("iscsiCommand(%s) -> %Rrc\n", pImage->pszTargetName, rc));
4689	LogFlowFunc(("returns %Rrc\n", rc));
4690	return rc;
4691	}
4692
4693	/** @copydoc VBOXHDDBACKEND::pfnGetVersion */
4694	static unsigned iscsiGetVersion(void *pBackendData)
4695	{
4696	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4697	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4698
4699	Assert(pImage);
4700	NOREF(pImage);
4701
4702	return 0;
4703	}
4704
4705	/** @copydoc VBOXHDDBACKEND::pfnGetSize */
4706	static uint64_t iscsiGetSize(void *pBackendData)
4707	{
4708	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4709	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4710
4711	Assert(pImage);
4712
4713	if (pImage)
4714	return pImage->cbSize;
4715	else
4716	return 0;
4717	}
4718
4719	/** @copydoc VBOXHDDBACKEND::pfnGetFileSize */
4720	static uint64_t iscsiGetFileSize(void *pBackendData)
4721	{
4722	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4723	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4724
4725	Assert(pImage);
4726	NOREF(pImage);
4727
4728	if (pImage)
4729	return pImage->cbSize;
4730	else
4731	return 0;
4732	}
4733
4734	/** @copydoc VBOXHDDBACKEND::pfnGetPCHSGeometry */
4735	static int iscsiGetPCHSGeometry(void *pBackendData, PVDGEOMETRY pPCHSGeometry)
4736	{
4737	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p\n", pBackendData, pPCHSGeometry));
4738	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4739	int rc;
4740
4741	Assert(pImage);
4742
4743	if (pImage)
4744	rc = VERR_VD_GEOMETRY_NOT_SET;
4745	else
4746	rc = VERR_VD_NOT_OPENED;
4747
4748	LogFlowFunc(("returns %Rrc (PCHS=%u/%u/%u)\n", rc, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
4749	return rc;
4750	}
4751
4752	/** @copydoc VBOXHDDBACKEND::pfnSetPCHSGeometry */
4753	static int iscsiSetPCHSGeometry(void *pBackendData, PCVDGEOMETRY pPCHSGeometry)
4754	{
4755	LogFlowFunc(("pBackendData=%#p pPCHSGeometry=%#p PCHS=%u/%u/%u\n", pBackendData, pPCHSGeometry, pPCHSGeometry->cCylinders, pPCHSGeometry->cHeads, pPCHSGeometry->cSectors));
4756	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4757	int rc;
4758
4759	Assert(pImage);
4760
4761	if (pImage)
4762	{
4763	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
4764	{
4765	rc = VERR_VD_IMAGE_READ_ONLY;
4766	goto out;
4767	}
4768	rc = VERR_VD_GEOMETRY_NOT_SET;
4769	}
4770	else
4771	rc = VERR_VD_NOT_OPENED;
4772
4773	out:
4774	LogFlowFunc(("returns %Rrc\n", rc));
4775	return rc;
4776	}
4777
4778	/** @copydoc VBOXHDDBACKEND::pfnGetLCHSGeometry */
4779	static int iscsiGetLCHSGeometry(void *pBackendData, PVDGEOMETRY pLCHSGeometry)
4780	{
4781	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p\n", pBackendData, pLCHSGeometry));
4782	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4783	int rc;
4784
4785	Assert(pImage);
4786
4787	if (pImage)
4788	rc = VERR_VD_GEOMETRY_NOT_SET;
4789	else
4790	rc = VERR_VD_NOT_OPENED;
4791
4792	LogFlowFunc(("returns %Rrc (LCHS=%u/%u/%u)\n", rc, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
4793	return rc;
4794	}
4795
4796	/** @copydoc VBOXHDDBACKEND::pfnSetLCHSGeometry */
4797	static int iscsiSetLCHSGeometry(void *pBackendData, PCVDGEOMETRY pLCHSGeometry)
4798	{
4799	LogFlowFunc(("pBackendData=%#p pLCHSGeometry=%#p LCHS=%u/%u/%u\n", pBackendData, pLCHSGeometry, pLCHSGeometry->cCylinders, pLCHSGeometry->cHeads, pLCHSGeometry->cSectors));
4800	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4801	int rc;
4802
4803	Assert(pImage);
4804
4805	if (pImage)
4806	{
4807	if (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY)
4808	{
4809	rc = VERR_VD_IMAGE_READ_ONLY;
4810	goto out;
4811	}
4812	rc = VERR_VD_GEOMETRY_NOT_SET;
4813	}
4814	else
4815	rc = VERR_VD_NOT_OPENED;
4816
4817	out:
4818	LogFlowFunc(("returns %Rrc\n", rc));
4819	return rc;
4820	}
4821
4822	/** @copydoc VBOXHDDBACKEND::pfnGetImageFlags */
4823	static unsigned iscsiGetImageFlags(void *pBackendData)
4824	{
4825	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4826	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4827	unsigned uImageFlags;
4828
4829	Assert(pImage);
4830	NOREF(pImage);
4831
4832	uImageFlags = VD_IMAGE_FLAGS_FIXED;
4833
4834	LogFlowFunc(("returns %#x\n", uImageFlags));
4835	return uImageFlags;
4836	}
4837
4838	/** @copydoc VBOXHDDBACKEND::pfnGetOpenFlags */
4839	static unsigned iscsiGetOpenFlags(void *pBackendData)
4840	{
4841	LogFlowFunc(("pBackendData=%#p\n", pBackendData));
4842	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4843	unsigned uOpenFlags;
4844
4845	Assert(pImage);
4846
4847	if (pImage)
4848	uOpenFlags = pImage->uOpenFlags;
4849	else
4850	uOpenFlags = 0;
4851
4852	LogFlowFunc(("returns %#x\n", uOpenFlags));
4853	return uOpenFlags;
4854	}
4855
4856	/** @copydoc VBOXHDDBACKEND::pfnSetOpenFlags */
4857	static int iscsiSetOpenFlags(void *pBackendData, unsigned uOpenFlags)
4858	{
4859	LogFlowFunc(("pBackendData=%#p\n uOpenFlags=%#x", pBackendData, uOpenFlags));
4860	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4861	int rc;
4862
4863	/* Image must be opened and the new flags must be valid. */
4864	if (!pImage \|\| (uOpenFlags & ~(VD_OPEN_FLAGS_READONLY \| VD_OPEN_FLAGS_INFO \| VD_OPEN_FLAGS_ASYNC_IO \| VD_OPEN_FLAGS_SHAREABLE \| VD_OPEN_FLAGS_SEQUENTIAL)))
4865	{
4866	rc = VERR_INVALID_PARAMETER;
4867	goto out;
4868	}
4869
4870	/* Implement this operation via reopening the image if we actually need
4871	* to do something. A read/write -> readonly transition doesn't need a
4872	* reopen. In the other direction we don't have the necessary information
4873	* as the "disk is readonly" flag is thrown away. Can be optimized too,
4874	* but it's not worth the effort at the moment. */
4875	if ( !(uOpenFlags & VD_OPEN_FLAGS_READONLY)
4876	&& (pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
4877	{
4878	iscsiFreeImage(pImage, false);
4879	rc = iscsiOpenImage(pImage, uOpenFlags);
4880	}
4881	else
4882	{
4883	pImage->uOpenFlags = uOpenFlags;
4884	rc = VINF_SUCCESS;
4885	}
4886	out:
4887	LogFlowFunc(("returns %Rrc\n", rc));
4888	return rc;
4889	}
4890
4891	/** @copydoc VBOXHDDBACKEND::pfnGetComment */
4892	static int iscsiGetComment(void pBackendData, char pszComment,
4893	size_t cbComment)
4894	{
4895	LogFlowFunc(("pBackendData=%#p pszComment=%#p cbComment=%zu\n", pBackendData, pszComment, cbComment));
4896	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4897	int rc;
4898
4899	Assert(pImage);
4900
4901	if (pImage)
4902	rc = VERR_NOT_SUPPORTED;
4903	else
4904	rc = VERR_VD_NOT_OPENED;
4905
4906	LogFlowFunc(("returns %Rrc comment='%s'\n", rc, pszComment));
4907	return rc;
4908	}
4909
4910	/** @copydoc VBOXHDDBACKEND::pfnSetComment */
4911	static int iscsiSetComment(void pBackendData, const char pszComment)
4912	{
4913	LogFlowFunc(("pBackendData=%#p pszComment=\"%s\"\n", pBackendData, pszComment));
4914	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4915	int rc;
4916
4917	Assert(pImage);
4918
4919	if (pImage)
4920	{
4921	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
4922	rc = VERR_NOT_SUPPORTED;
4923	else
4924	rc = VERR_VD_IMAGE_READ_ONLY;
4925	}
4926	else
4927	rc = VERR_VD_NOT_OPENED;
4928
4929	LogFlowFunc(("returns %Rrc\n", rc));
4930	return rc;
4931	}
4932
4933	/** @copydoc VBOXHDDBACKEND::pfnGetUuid */
4934	static int iscsiGetUuid(void *pBackendData, PRTUUID pUuid)
4935	{
4936	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
4937	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4938	int rc;
4939
4940	Assert(pImage);
4941
4942	if (pImage)
4943	rc = VERR_NOT_SUPPORTED;
4944	else
4945	rc = VERR_VD_NOT_OPENED;
4946
4947	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
4948	return rc;
4949	}
4950
4951	/** @copydoc VBOXHDDBACKEND::pfnSetUuid */
4952	static int iscsiSetUuid(void *pBackendData, PCRTUUID pUuid)
4953	{
4954	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
4955	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4956	int rc;
4957
4958	LogFlowFunc(("%RTuuid\n", pUuid));
4959	Assert(pImage);
4960
4961	if (pImage)
4962	{
4963	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
4964	rc = VERR_NOT_SUPPORTED;
4965	else
4966	rc = VERR_VD_IMAGE_READ_ONLY;
4967	}
4968	else
4969	rc = VERR_VD_NOT_OPENED;
4970
4971	LogFlowFunc(("returns %Rrc\n", rc));
4972	return rc;
4973	}
4974
4975	/** @copydoc VBOXHDDBACKEND::pfnGetModificationUuid */
4976	static int iscsiGetModificationUuid(void *pBackendData, PRTUUID pUuid)
4977	{
4978	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
4979	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4980	int rc;
4981
4982	Assert(pImage);
4983
4984	if (pImage)
4985	rc = VERR_NOT_SUPPORTED;
4986	else
4987	rc = VERR_VD_NOT_OPENED;
4988
4989	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
4990	return rc;
4991	}
4992
4993	/** @copydoc VBOXHDDBACKEND::pfnSetModificationUuid */
4994	static int iscsiSetModificationUuid(void *pBackendData, PCRTUUID pUuid)
4995	{
4996	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
4997	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
4998	int rc;
4999
5000	LogFlowFunc(("%RTuuid\n", pUuid));
5001	Assert(pImage);
5002
5003	if (pImage)
5004	{
5005	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
5006	rc = VERR_NOT_SUPPORTED;
5007	else
5008	rc = VERR_VD_IMAGE_READ_ONLY;
5009	}
5010	else
5011	rc = VERR_VD_NOT_OPENED;
5012
5013	LogFlowFunc(("returns %Rrc\n", rc));
5014	return rc;
5015	}
5016
5017	/** @copydoc VBOXHDDBACKEND::pfnGetParentUuid */
5018	static int iscsiGetParentUuid(void *pBackendData, PRTUUID pUuid)
5019	{
5020	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
5021	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5022	int rc;
5023
5024	Assert(pImage);
5025
5026	if (pImage)
5027	rc = VERR_NOT_SUPPORTED;
5028	else
5029	rc = VERR_VD_NOT_OPENED;
5030
5031	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
5032	return rc;
5033	}
5034
5035	/** @copydoc VBOXHDDBACKEND::pfnSetParentUuid */
5036	static int iscsiSetParentUuid(void *pBackendData, PCRTUUID pUuid)
5037	{
5038	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
5039	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5040	int rc;
5041
5042	LogFlowFunc(("%RTuuid\n", pUuid));
5043	Assert(pImage);
5044
5045	if (pImage)
5046	{
5047	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
5048	rc = VERR_NOT_SUPPORTED;
5049	else
5050	rc = VERR_VD_IMAGE_READ_ONLY;
5051	}
5052	else
5053	rc = VERR_VD_NOT_OPENED;
5054
5055	LogFlowFunc(("returns %Rrc\n", rc));
5056	return rc;
5057	}
5058
5059	/** @copydoc VBOXHDDBACKEND::pfnGetParentModificationUuid */
5060	static int iscsiGetParentModificationUuid(void *pBackendData, PRTUUID pUuid)
5061	{
5062	LogFlowFunc(("pBackendData=%#p pUuid=%#p\n", pBackendData, pUuid));
5063	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5064	int rc;
5065
5066	Assert(pImage);
5067
5068	if (pImage)
5069	rc = VERR_NOT_SUPPORTED;
5070	else
5071	rc = VERR_VD_NOT_OPENED;
5072
5073	LogFlowFunc(("returns %Rrc (%RTuuid)\n", rc, pUuid));
5074	return rc;
5075	}
5076
5077	/** @copydoc VBOXHDDBACKEND::pfnSetParentModificationUuid */
5078	static int iscsiSetParentModificationUuid(void *pBackendData, PCRTUUID pUuid)
5079	{
5080	LogFlowFunc(("pBackendData=%#p Uuid=%RTuuid\n", pBackendData, pUuid));
5081	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5082	int rc;
5083
5084	LogFlowFunc(("%RTuuid\n", pUuid));
5085	Assert(pImage);
5086
5087	if (pImage)
5088	{
5089	if (!(pImage->uOpenFlags & VD_OPEN_FLAGS_READONLY))
5090	rc = VERR_NOT_SUPPORTED;
5091	else
5092	rc = VERR_VD_IMAGE_READ_ONLY;
5093	}
5094	else
5095	rc = VERR_VD_NOT_OPENED;
5096
5097	LogFlowFunc(("returns %Rrc\n", rc));
5098	return rc;
5099	}
5100
5101	/** @copydoc VBOXHDDBACKEND::pfnDump */
5102	static void iscsiDump(void *pBackendData)
5103	{
5104	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5105
5106	Assert(pImage);
5107	if (pImage)
5108	{
5109	/** @todo put something useful here */
5110	vdIfErrorMessage(pImage->pIfError, "Header: cVolume=%u\n", pImage->cVolume);
5111	}
5112	}
5113
5114	/** @copydoc VBOXHDDBACKEND::pfnAsyncRead */
5115	static int iscsiAsyncRead(void *pBackendData, uint64_t uOffset, size_t cbToRead,
5116	PVDIOCTX pIoCtx, size_t *pcbActuallyRead)
5117	{
5118	LogFlowFunc(("pBackendData=%p uOffset=%#llx pIoCtx=%#p cbToRead=%u pcbActuallyRead=%p\n",
5119	pBackendData, uOffset, pIoCtx, cbToRead, pcbActuallyRead));
5120	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5121	int rc = VINF_SUCCESS;
5122
5123	if (uOffset + cbToRead > pImage->cbSize)
5124	return VERR_INVALID_PARAMETER;
5125
5126	/*
5127	* Clip read size to a value which is supported by the target.
5128	*/
5129	cbToRead = RT_MIN(cbToRead, pImage->cbRecvDataLength);
5130
5131	unsigned cT2ISegs = 0;
5132	size_t cbSegs = 0;
5133
5134	/* Get the number of segments. */
5135	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5136	NULL, &cT2ISegs, cbToRead);
5137	Assert(cbSegs == cbToRead);
5138
5139	PSCSIREQASYNC pReqAsync = (PSCSIREQASYNC)RTMemAllocZ(RT_OFFSETOF(SCSIREQASYNC, aSegs[cT2ISegs]));
5140	if (RT_LIKELY(pReqAsync))
5141	{
5142	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(sizeof(SCSIREQ));
5143	if (pReq)
5144	{
5145	uint64_t lba;
5146	uint16_t tls;
5147	uint8_t *pbCDB = &pReqAsync->abCDB[0];
5148	size_t cbCDB;
5149
5150	lba = uOffset / pImage->cbSector;
5151	tls = (uint16_t)(cbToRead / pImage->cbSector);
5152
5153	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5154	&pReqAsync->aSegs[0],
5155	&cT2ISegs, cbToRead);
5156	Assert(cbSegs == cbToRead);
5157	pReqAsync->cT2ISegs = cT2ISegs;
5158	pReqAsync->pIoCtx = pIoCtx;
5159	pReqAsync->pScsiReq = pReq;
5160	pReqAsync->cSenseRetries = 10;
5161	pReqAsync->rcSense = VERR_READ_ERROR;
5162
5163	if (pImage->cVolume < _4G)
5164	{
5165	cbCDB = 10;
5166	pbCDB[0] = SCSI_READ_10;
5167	pbCDB[1] = 0; /* reserved */
5168	pbCDB[2] = (lba >> 24) & 0xff;
5169	pbCDB[3] = (lba >> 16) & 0xff;
5170	pbCDB[4] = (lba >> 8) & 0xff;
5171	pbCDB[5] = lba & 0xff;
5172	pbCDB[6] = 0; /* reserved */
5173	pbCDB[7] = (tls >> 8) & 0xff;
5174	pbCDB[8] = tls & 0xff;
5175	pbCDB[9] = 0; /* control */
5176	}
5177	else
5178	{
5179	cbCDB = 16;
5180	pbCDB[0] = SCSI_READ_16;
5181	pbCDB[1] = 0; /* reserved */
5182	pbCDB[2] = (lba >> 56) & 0xff;
5183	pbCDB[3] = (lba >> 48) & 0xff;
5184	pbCDB[4] = (lba >> 40) & 0xff;
5185	pbCDB[5] = (lba >> 32) & 0xff;
5186	pbCDB[6] = (lba >> 24) & 0xff;
5187	pbCDB[7] = (lba >> 16) & 0xff;
5188	pbCDB[8] = (lba >> 8) & 0xff;
5189	pbCDB[9] = lba & 0xff;
5190	pbCDB[10] = 0; /* tls unused */
5191	pbCDB[11] = 0; /* tls unused */
5192	pbCDB[12] = (tls >> 8) & 0xff;
5193	pbCDB[13] = tls & 0xff;
5194	pbCDB[14] = 0; /* reserved */
5195	pbCDB[15] = 0; /* reserved */
5196	}
5197
5198	pReq->enmXfer = SCSIXFER_FROM_TARGET;
5199	pReq->cbCDB = cbCDB;
5200	pReq->pvCDB = pReqAsync->abCDB;
5201	pReq->cbI2TData = 0;
5202	pReq->paI2TSegs = NULL;
5203	pReq->cI2TSegs = 0;
5204	pReq->cbT2IData = cbToRead;
5205	pReq->paT2ISegs = &pReqAsync->aSegs[pReqAsync->cI2TSegs];
5206	pReq->cT2ISegs = pReqAsync->cT2ISegs;
5207	pReq->cbSense = sizeof(pReqAsync->abSense);
5208	pReq->pvSense = pReqAsync->abSense;
5209
5210	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReqAsync);
5211	if (RT_FAILURE(rc))
5212	AssertMsgFailed(("iscsiCommand(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
5213	else
5214	{
5215	*pcbActuallyRead = cbToRead;
5216	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
5217	}
5218
5219	RTMemFree(pReq);
5220	}
5221	else
5222	rc = VERR_NO_MEMORY;
5223
5224	RTMemFree(pReqAsync);
5225	}
5226	else
5227	rc = VERR_NO_MEMORY;
5228
5229	LogFlowFunc(("returns rc=%Rrc\n", rc));
5230	return rc;
5231	}
5232
5233	/** @copydoc VBOXHDDBACKEND::pfnAsyncWrite */
5234	static int iscsiAsyncWrite(void *pBackendData, uint64_t uOffset, size_t cbToWrite,
5235	PVDIOCTX pIoCtx,
5236	size_t pcbWriteProcess, size_t pcbPreRead,
5237	size_t *pcbPostRead, unsigned fWrite)
5238	{
5239	LogFlowFunc(("pBackendData=%p uOffset=%llu pIoCtx=%#p cbToWrite=%u pcbWriteProcess=%p pcbPreRead=%p pcbPostRead=%p fWrite=%u\n",
5240	pBackendData, uOffset, pIoCtx, cbToWrite, pcbWriteProcess, pcbPreRead, pcbPostRead, fWrite));
5241	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5242	int rc = VINF_SUCCESS;
5243
5244	AssertPtr(pImage);
5245	Assert(uOffset % 512 == 0);
5246	Assert(cbToWrite % 512 == 0);
5247
5248	if (uOffset + cbToWrite > pImage->cbSize)
5249	return VERR_INVALID_PARAMETER;
5250
5251	/*
5252	* Clip read size to a value which is supported by the target.
5253	*/
5254	cbToWrite = RT_MIN(cbToWrite, pImage->cbSendDataLength);
5255
5256	unsigned cI2TSegs = 0;
5257	size_t cbSegs = 0;
5258
5259	/* Get the number of segments. */
5260	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5261	NULL, &cI2TSegs, cbToWrite);
5262	Assert(cbSegs == cbToWrite);
5263
5264	PSCSIREQASYNC pReqAsync = (PSCSIREQASYNC)RTMemAllocZ(RT_OFFSETOF(SCSIREQASYNC, aSegs[cI2TSegs]));
5265	if (RT_LIKELY(pReqAsync))
5266	{
5267	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(sizeof(SCSIREQ));
5268	if (pReq)
5269	{
5270	uint64_t lba;
5271	uint16_t tls;
5272	uint8_t *pbCDB = &pReqAsync->abCDB[0];
5273	size_t cbCDB;
5274
5275	lba = uOffset / pImage->cbSector;
5276	tls = (uint16_t)(cbToWrite / pImage->cbSector);
5277
5278	cbSegs = pImage->pIfIo->pfnIoCtxSegArrayCreate(pImage->pIfIo->Core.pvUser, pIoCtx,
5279	&pReqAsync->aSegs[0],
5280	&cI2TSegs, cbToWrite);
5281	Assert(cbSegs == cbToWrite);
5282	pReqAsync->cI2TSegs = cI2TSegs;
5283	pReqAsync->pIoCtx = pIoCtx;
5284	pReqAsync->pScsiReq = pReq;
5285	pReqAsync->cSenseRetries = 10;
5286	pReqAsync->rcSense = VERR_WRITE_ERROR;
5287
5288	if (pImage->cVolume < _4G)
5289	{
5290	cbCDB = 10;
5291	pbCDB[0] = SCSI_WRITE_10;
5292	pbCDB[1] = 0; /* reserved */
5293	pbCDB[2] = (lba >> 24) & 0xff;
5294	pbCDB[3] = (lba >> 16) & 0xff;
5295	pbCDB[4] = (lba >> 8) & 0xff;
5296	pbCDB[5] = lba & 0xff;
5297	pbCDB[6] = 0; /* reserved */
5298	pbCDB[7] = (tls >> 8) & 0xff;
5299	pbCDB[8] = tls & 0xff;
5300	pbCDB[9] = 0; /* control */
5301	}
5302	else
5303	{
5304	cbCDB = 16;
5305	pbCDB[0] = SCSI_WRITE_16;
5306	pbCDB[1] = 0; /* reserved */
5307	pbCDB[2] = (lba >> 56) & 0xff;
5308	pbCDB[3] = (lba >> 48) & 0xff;
5309	pbCDB[4] = (lba >> 40) & 0xff;
5310	pbCDB[5] = (lba >> 32) & 0xff;
5311	pbCDB[6] = (lba >> 24) & 0xff;
5312	pbCDB[7] = (lba >> 16) & 0xff;
5313	pbCDB[8] = (lba >> 8) & 0xff;
5314	pbCDB[9] = lba & 0xff;
5315	pbCDB[10] = 0; /* tls unused */
5316	pbCDB[11] = 0; /* tls unused */
5317	pbCDB[12] = (tls >> 8) & 0xff;
5318	pbCDB[13] = tls & 0xff;
5319	pbCDB[14] = 0; /* reserved */
5320	pbCDB[15] = 0; /* reserved */
5321	}
5322
5323	pReq->enmXfer = SCSIXFER_TO_TARGET;
5324	pReq->cbCDB = cbCDB;
5325	pReq->pvCDB = pReqAsync->abCDB;
5326	pReq->cbI2TData = cbToWrite;
5327	pReq->paI2TSegs = &pReqAsync->aSegs[0];
5328	pReq->cI2TSegs = pReqAsync->cI2TSegs;
5329	pReq->cbT2IData = 0;
5330	pReq->paT2ISegs = NULL;
5331	pReq->cT2ISegs = 0;
5332	pReq->cbSense = sizeof(pReqAsync->abSense);
5333	pReq->pvSense = pReqAsync->abSense;
5334
5335	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReqAsync);
5336	if (RT_FAILURE(rc))
5337	AssertMsgFailed(("iscsiCommand(%s, %#llx) -> %Rrc\n", pImage->pszTargetName, uOffset, rc));
5338	else
5339	{
5340	*pcbWriteProcess = cbToWrite;
5341	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
5342	}
5343
5344	RTMemFree(pReq);
5345	}
5346	else
5347	rc = VERR_NO_MEMORY;
5348
5349	RTMemFree(pReqAsync);
5350	}
5351	else
5352	rc = VERR_NO_MEMORY;
5353
5354	LogFlowFunc(("returns rc=%Rrc\n", rc));
5355	return rc;
5356	}
5357
5358	/** @copydoc VBOXHDDBACKEND::pfnAsyncFlush */
5359	static int iscsiAsyncFlush(void *pBackendData, PVDIOCTX pIoCtx)
5360	{
5361	LogFlowFunc(("pBackendData=%p pIoCtx=%#p\n", pBackendData, pIoCtx));
5362	PISCSIIMAGE pImage = (PISCSIIMAGE)pBackendData;
5363	int rc = VINF_SUCCESS;
5364
5365	PSCSIREQASYNC pReqAsync = (PSCSIREQASYNC)RTMemAllocZ(sizeof(SCSIREQASYNC));
5366	if (RT_LIKELY(pReqAsync))
5367	{
5368	PSCSIREQ pReq = (PSCSIREQ)RTMemAllocZ(sizeof(SCSIREQ));
5369	if (pReq)
5370	{
5371	uint8_t *pbCDB = &pReqAsync->abCDB[0];
5372
5373	pReqAsync->pIoCtx = pIoCtx;
5374	pReqAsync->pScsiReq = pReq;
5375	pReqAsync->cSenseRetries = 0;
5376	pReqAsync->rcSense = VINF_SUCCESS;
5377
5378	pbCDB[0] = SCSI_SYNCHRONIZE_CACHE;
5379	pbCDB[1] = 0; /* reserved */
5380	pbCDB[2] = 0; /* reserved */
5381	pbCDB[3] = 0; /* reserved */
5382	pbCDB[4] = 0; /* reserved */
5383	pbCDB[5] = 0; /* reserved */
5384	pbCDB[6] = 0; /* reserved */
5385	pbCDB[7] = 0; /* reserved */
5386	pbCDB[8] = 0; /* reserved */
5387	pbCDB[9] = 0; /* control */
5388
5389	pReq->enmXfer = SCSIXFER_NONE;
5390	pReq->cbCDB = 10;
5391	pReq->pvCDB = pReqAsync->abCDB;
5392	pReq->cbI2TData = 0;
5393	pReq->paI2TSegs = NULL;
5394	pReq->cI2TSegs = 0;
5395	pReq->cbT2IData = 0;
5396	pReq->paT2ISegs = NULL;
5397	pReq->cT2ISegs = 0;
5398	pReq->cbSense = sizeof(pReqAsync->abSense);
5399	pReq->pvSense = pReqAsync->abSense;
5400
5401	rc = iscsiCommandAsync(pImage, pReq, iscsiCommandAsyncComplete, pReqAsync);
5402	if (RT_FAILURE(rc))
5403	AssertMsgFailed(("iscsiCommand(%s) -> %Rrc\n", pImage->pszTargetName, rc));
5404	else
5405	return VERR_VD_IOCTX_HALT; /* Halt the I/O context until further notification from the I/O thread. */
5406
5407	RTMemFree(pReq);
5408	}
5409	else
5410	rc = VERR_NO_MEMORY;
5411
5412	RTMemFree(pReqAsync);
5413	}
5414	else
5415	rc = VERR_NO_MEMORY;
5416
5417	LogFlowFunc(("returns rc=%Rrc\n", rc));
5418	return rc;
5419	}
5420
5421	/** @copydoc VBOXHDDBACKEND::pfnComposeLocation */
5422	static int iscsiComposeLocation(PVDINTERFACE pConfig, char **pszLocation)
5423	{
5424	char *pszTarget = NULL;
5425	char *pszLUN = NULL;
5426	char *pszAddress = NULL;
5427	int rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetName", &pszTarget);
5428	if (RT_SUCCESS(rc))
5429	{
5430	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "LUN", &pszLUN);
5431	if (RT_SUCCESS(rc))
5432	{
5433	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetAddress", &pszAddress);
5434	if (RT_SUCCESS(rc))
5435	{
5436	if (RTStrAPrintf(pszLocation, "iscsi://%s/%s/%s",
5437	pszAddress, pszTarget, pszLUN) < 0)
5438	rc = VERR_NO_MEMORY;
5439	}
5440	}
5441	}
5442	RTMemFree(pszTarget);
5443	RTMemFree(pszLUN);
5444	RTMemFree(pszAddress);
5445	return rc;
5446	}
5447
5448	/** @copydoc VBOXHDDBACKEND::pfnComposeName */
5449	static int iscsiComposeName(PVDINTERFACE pConfig, char **pszName)
5450	{
5451	char *pszTarget = NULL;
5452	char *pszLUN = NULL;
5453	char *pszAddress = NULL;
5454	int rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetName", &pszTarget);
5455	if (RT_SUCCESS(rc))
5456	{
5457	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "LUN", &pszLUN);
5458	if (RT_SUCCESS(rc))
5459	{
5460	rc = VDCFGQueryStringAlloc(VDIfConfigGet(pConfig), "TargetAddress", &pszAddress);
5461	if (RT_SUCCESS(rc))
5462	{
5463	/** @todo think about a nicer looking location scheme for iSCSI */
5464	if (RTStrAPrintf(pszName, "%s/%s/%s",
5465	pszAddress, pszTarget, pszLUN) < 0)
5466	rc = VERR_NO_MEMORY;
5467	}
5468	}
5469	}
5470	RTMemFree(pszTarget);
5471	RTMemFree(pszLUN);
5472	RTMemFree(pszAddress);
5473
5474	return rc;
5475	}
5476
5477
5478	VBOXHDDBACKEND g_ISCSIBackend =
5479	{
5480	/* pszBackendName */
5481	"iSCSI",
5482	/* cbSize */
5483	sizeof(VBOXHDDBACKEND),
5484	/* uBackendCaps */
5485	VD_CAP_CONFIG \| VD_CAP_TCPNET \| VD_CAP_ASYNC,
5486	/* papszFileExtensions */
5487	NULL,
5488	/* paConfigInfo */
5489	s_iscsiConfigInfo,
5490	/* hPlugin */
5491	NIL_RTLDRMOD,
5492	/* pfnCheckIfValid */
5493	iscsiCheckIfValid,
5494	/* pfnOpen */
5495	iscsiOpen,
5496	/* pfnCreate */
5497	iscsiCreate,
5498	/* pfnRename */
5499	NULL,
5500	/* pfnClose */
5501	iscsiClose,
5502	/* pfnRead */
5503	iscsiRead,
5504	/* pfnWrite */
5505	iscsiWrite,
5506	/* pfnFlush */
5507	iscsiFlush,
5508	/* pfnGetVersion */
5509	iscsiGetVersion,
5510	/* pfnGetSize */
5511	iscsiGetSize,
5512	/* pfnGetFileSize */
5513	iscsiGetFileSize,
5514	/* pfnGetPCHSGeometry */
5515	iscsiGetPCHSGeometry,
5516	/* pfnSetPCHSGeometry */
5517	iscsiSetPCHSGeometry,
5518	/* pfnGetLCHSGeometry */
5519	iscsiGetLCHSGeometry,
5520	/* pfnSetLCHSGeometry */
5521	iscsiSetLCHSGeometry,
5522	/* pfnGetImageFlags */
5523	iscsiGetImageFlags,
5524	/* pfnGetOpenFlags */
5525	iscsiGetOpenFlags,
5526	/* pfnSetOpenFlags */
5527	iscsiSetOpenFlags,
5528	/* pfnGetComment */
5529	iscsiGetComment,
5530	/* pfnSetComment */
5531	iscsiSetComment,
5532	/* pfnGetUuid */
5533	iscsiGetUuid,
5534	/* pfnSetUuid */
5535	iscsiSetUuid,
5536	/* pfnGetModificationUuid */
5537	iscsiGetModificationUuid,
5538	/* pfnSetModificationUuid */
5539	iscsiSetModificationUuid,
5540	/* pfnGetParentUuid */
5541	iscsiGetParentUuid,
5542	/* pfnSetParentUuid */
5543	iscsiSetParentUuid,
5544	/* pfnGetParentModificationUuid */
5545	iscsiGetParentModificationUuid,
5546	/* pfnSetParentModificationUuid */
5547	iscsiSetParentModificationUuid,
5548	/* pfnDump */
5549	iscsiDump,
5550	/* pfnGetTimeStamp */
5551	NULL,
5552	/* pfnGetParentTimeStamp */
5553	NULL,
5554	/* pfnSetParentTimeStamp */
5555	NULL,
5556	/* pfnGetParentFilename */
5557	NULL,
5558	/* pfnSetParentFilename */
5559	NULL,
5560	/* pfnAsyncRead */
5561	iscsiAsyncRead,
5562	/* pfnAsyncWrite */
5563	iscsiAsyncWrite,
5564	/* pfnAsyncFlush */
5565	iscsiAsyncFlush,
5566	/* pfnComposeLocation */
5567	iscsiComposeLocation,
5568	/* pfnComposeName */
5569	iscsiComposeName,
5570	/* pfnCompact */
5571	NULL,
5572	/* pfnResize */
5573	NULL,
5574	/* pfnDiscard */
5575	NULL,
5576	/* pfnAsyncDiscard */
5577	NULL,
5578	/* pfnRepair */
5579	NULL
5580	};

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source: vbox/trunk/src/VBox/Storage/ISCSI.cpp@ 41146

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