tcp.cpp@ 11118

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1	/* $Id: tcp.cpp 8245 2008-04-21 17:24:28Z vboxsync $ */
2	/** @file
3	* IPRT - TCP/IP.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
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	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*
26	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
27	* Clara, CA 95054 USA or visit http://www.sun.com if you need
28	* additional information or have any questions.
29	*/
30
31
32	/*******************************************************************************
33	* Header Files *
34	*******************************************************************************/
35	#ifdef RT_OS_WINDOWS
36	#include <winsock.h>
37	#else /* !RT_OS_WINDOWS */
38	#include <errno.h>
39	#include <sys/stat.h>
40	#include <sys/socket.h>
41	#include <netinet/in.h>
42	#include <netinet/tcp.h>
43	#include <arpa/inet.h>
44	#include <sys/un.h>
45	#include <netdb.h>
46	#include <unistd.h>
47	#endif /* !RT_OS_WINDOWS */
48
49	#include <iprt/tcp.h>
50	#include <iprt/thread.h>
51	#include <iprt/alloc.h>
52	#include <iprt/assert.h>
53	#include <iprt/asm.h>
54	#include <iprt/err.h>
55	#include <iprt/string.h>
56
57
58	/* non-standard linux stuff (it seems). */
59	#ifndef MSG_NOSIGNAL
60	# define MSG_NOSIGNAL 0
61	#endif
62	#ifndef SHUT_RDWR
63	# ifdef SD_BOTH
64	# define SHUT_RDWR SD_BOTH
65	# else
66	# define SHUT_RDWR 2
67	# endif
68	#endif
69
70	/* fixup backlevel OSes. */
71	#if defined(RT_OS_OS2) \|\| defined(RT_OS_WINDOWS)
72	# define socklen_t int
73	#endif
74
75
76	/*******************************************************************************
77	* Defined Constants And Macros *
78	*******************************************************************************/
79	#define BACKLOG 10 /* how many pending connections queue will hold */
80
81
82	/*******************************************************************************
83	* Structures and Typedefs *
84	*******************************************************************************/
85	/**
86	* TCP Server state.
87	*/
88	typedef enum RTTCPSERVERSTATE
89	{
90	/** Invalid. */
91	RTTCPSERVERSTATE_INVALID = 0,
92	/** Created. */
93	RTTCPSERVERSTATE_CREATED,
94	/** Listener thread is starting up. */
95	RTTCPSERVERSTATE_STARTING,
96	/** Accepting client connections. */
97	RTTCPSERVERSTATE_ACCEPTING,
98	/** Serving a client. */
99	RTTCPSERVERSTATE_SERVING,
100	/** Listener terminating. */
101	RTTCPSERVERSTATE_STOPPING,
102	/** Listener terminated. */
103	RTTCPSERVERSTATE_STOPPED,
104	/** Destroying signaling to the listener, listener will wait. */
105	RTTCPSERVERSTATE_SIGNALING,
106	/** Listener cleans up. */
107	RTTCPSERVERSTATE_DESTROYING,
108	/** Freed. */
109	RTTCPSERVERSTATE_FREED
110	} RTTCPSERVERSTATE;
111
112	/*
113	* Internal representation of the TCP Server handle.
114	*/
115	typedef struct RTTCPSERVER
116	{
117	/** The server state. */
118	RTTCPSERVERSTATE volatile enmState;
119	/** The server thread. */
120	RTTHREAD Thread;
121	/** The server socket. */
122	RTSOCKET volatile SockServer;
123	/** The socket to the client currently being serviced.
124	* This is NIL_RTSOCKET when no client is serviced. */
125	RTSOCKET volatile SockClient;
126	/** The connection function. */
127	PFNRTTCPSERVE pfnServe;
128	/** Argument to pfnServer. */
129	void *pvUser;
130	} RTTCPSERVER;
131
132
133	/*******************************************************************************
134	* Internal Functions *
135	*******************************************************************************/
136	static DECLCALLBACK(int) rtTcpServerThread(RTTHREAD ThreadSelf, void *pvServer);
137	static int rtTcpServerListen(PRTTCPSERVER pServer);
138	static void rcTcpServerListenCleanup(PRTTCPSERVER pServer);
139	static void rtTcpServerDestroyServerSock(RTSOCKET SockServer, const char *pszMsg);
140	static int rtTcpClose(RTSOCKET Sock, const char *pszMsg);
141
142
143
144	/**
145	* Get the last error as an iprt status code.
146	* @returns iprt status code.
147	*/
148	DECLINLINE(int) rtTcpError(void)
149	{
150	#ifdef RT_OS_WINDOWS
151	return RTErrConvertFromWin32(WSAGetLastError());
152	#else
153	return RTErrConvertFromErrno(errno);
154	#endif
155	}
156
157
158	/**
159	* Atomicly updates a socket variable.
160	* @returns The old value.
161	* @param pSock The socket variable to update.
162	* @param Sock The new value.
163	*/
164	DECLINLINE(RTSOCKET) rtTcpAtomicXchgSock(RTSOCKET volatile *pSock, const RTSOCKET Sock)
165	{
166	switch (sizeof(RTSOCKET))
167	{
168	case 4: return (RTSOCKET)ASMAtomicXchgS32((int32_t volatile *)pSock, (int32_t)Sock);
169	default:
170	AssertReleaseFailed();
171	return NIL_RTSOCKET;
172	}
173	}
174
175
176	/**
177	* Changes the TCP server state.
178	*/
179	DECLINLINE(bool) rtTcpServerSetState(PRTTCPSERVER pServer, RTTCPSERVERSTATE enmStateNew, RTTCPSERVERSTATE enmStateOld)
180	{
181	bool fRc;
182	ASMAtomicCmpXchgSize(&pServer->enmState, enmStateNew, enmStateOld, fRc);
183	return fRc;
184	}
185
186
187	/**
188	* Create single connection at a time TCP Server in a separate thread.
189	*
190	* The thread will loop accepting connections and call pfnServe for
191	* each of the incoming connections in turn. The pfnServe function can
192	* return VERR_TCP_SERVER_STOP too terminate this loop. RTTcpServerDestroy()
193	* should be used to terminate the server.
194	*
195	* @returns iprt status code.
196	* @param pszAddress The address for creating a listening socket.
197	* If NULL or empty string the server is bound to all interfaces.
198	* @param uPort The port for creating a listening socket.
199	* @param enmType The thread type.
200	* @param pszThrdName The name of the worker thread.
201	* @param pfnServe The function which will serve a new client connection.
202	* @param pvUser User argument passed to pfnServe.
203	* @param ppServer Where to store the serverhandle.
204	*/
205	RTR3DECL(int) RTTcpServerCreate(const char pszAddress, unsigned uPort, RTTHREADTYPE enmType, const char pszThrdName,
206	PFNRTTCPSERVE pfnServe, void *pvUser, PPRTTCPSERVER ppServer)
207	{
208	/*
209	* Do params checking
210	*/
211	if (!uPort \|\| !pfnServe \|\| !pszThrdName \|\| !ppServer)
212	{
213	AssertMsgFailed(("Invalid params\n"));
214	return VERR_INVALID_PARAMETER;
215	}
216
217	/*
218	* Create the server.
219	*/
220	PRTTCPSERVER pServer;
221	int rc = RTTcpServerCreateEx(pszAddress, uPort, &pServer);
222	if (RT_SUCCESS(rc))
223	{
224	/*
225	* Create the listener thread.
226	*/
227	pServer->enmState = RTTCPSERVERSTATE_STARTING;
228	pServer->pvUser = pvUser;
229	pServer->pfnServe = pfnServe;
230	rc = RTThreadCreate(&pServer->Thread, rtTcpServerThread, pServer, 0, enmType, /RTTHREADFLAGS_WAITABLE/0, pszThrdName);
231	if (RT_SUCCESS(rc))
232	{
233	/* done */
234	if (ppServer)
235	*ppServer = pServer;
236	return rc;
237	}
238
239	/*
240	* Destroy the server.
241	*/
242	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_CREATED, RTTCPSERVERSTATE_STARTING);
243	RTTcpServerDestroy(pServer);
244	}
245
246	return rc;
247	}
248
249
250	/**
251	* Server thread, loops accepting connections until it's terminated.
252	*
253	* @returns iprt status code. (ignored).
254	* @param ThreadSelf Thread handle.
255	* @param pvServer Server handle.
256	*/
257	static DECLCALLBACK(int) rtTcpServerThread(RTTHREAD ThreadSelf, void *pvServer)
258	{
259	PRTTCPSERVER pServer = (PRTTCPSERVER)pvServer;
260	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, RTTCPSERVERSTATE_STARTING))
261	return rtTcpServerListen(pServer);
262	rcTcpServerListenCleanup(pServer);
263	NOREF(ThreadSelf);
264	return VINF_SUCCESS;
265	}
266
267
268	/**
269	* Create single connection at a time TCP Server.
270	* The caller must call RTTcpServerListen() to actually start the server.
271	*
272	* @returns iprt status code.
273	* @param pszAddress The address for creating a listening socket.
274	* If NULL the server is bound to all interfaces.
275	* @param uPort The port for creating a listening socket.
276	* @param ppServer Where to store the serverhandle.
277	*/
278	RTR3DECL(int) RTTcpServerCreateEx(const char *pszAddress, uint32_t uPort, PPRTTCPSERVER ppServer)
279	{
280	int rc;
281
282	/*
283	* Do params checking
284	*/
285	if (!uPort \|\| !ppServer)
286	{
287	AssertMsgFailed(("Invalid params\n"));
288	return VERR_INVALID_PARAMETER;
289	}
290
291	#ifdef RT_OS_WINDOWS
292	/*
293	* Initialize WinSock and check version.
294	*/
295	WORD wVersionRequested = MAKEWORD(1, 1);
296	WSADATA wsaData;
297	rc = WSAStartup(wVersionRequested, &wsaData);
298	if (wsaData.wVersion != wVersionRequested)
299	{
300	AssertMsgFailed(("Wrong winsock version\n"));
301	return VERR_NOT_SUPPORTED;
302	}
303	#endif
304
305	/*
306	* Get host listening address.
307	*/
308	struct hostent *pHostEnt = NULL;
309	if (pszAddress != NULL && *pszAddress)
310	{
311	pHostEnt = gethostbyname(pszAddress);
312	if (!pHostEnt)
313	{
314	struct in_addr InAddr;
315	InAddr.s_addr = inet_addr(pszAddress);
316	pHostEnt = gethostbyaddr((char *)&InAddr, 4, AF_INET);
317	if (!pHostEnt)
318	{
319	rc = rtTcpError();
320	AssertMsgFailed(("Could not get host address rc=%Vrc\n", rc));
321	return rc;
322	}
323	}
324	}
325
326	/*
327	* Setting up socket.
328	*/
329	RTSOCKET WaitSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
330	if (WaitSock != -1)
331	{
332	/*
333	* Set socket options.
334	*/
335	int fFlag = 1;
336	if (!setsockopt(WaitSock, SOL_SOCKET, SO_REUSEADDR, (const char *)&fFlag, sizeof(fFlag)))
337	{
338	/*
339	* Set socket family, address and port.
340	*/
341	struct sockaddr_in LocalAddr = {0};
342	LocalAddr.sin_family = AF_INET;
343	LocalAddr.sin_port = htons(uPort);
344	/* if address not specified, use INADDR_ANY. */
345	if (!pHostEnt)
346	LocalAddr.sin_addr.s_addr = INADDR_ANY;
347	else
348	LocalAddr.sin_addr = ((struct in_addr )pHostEnt->h_addr);
349
350	/*
351	* Bind a name to a socket.
352	*/
353	if (bind(WaitSock, (struct sockaddr *)&LocalAddr, sizeof(LocalAddr)) != -1)
354	{
355	/*
356	* Listen for connections on a socket.
357	*/
358	if (listen(WaitSock, BACKLOG) != -1)
359	{
360	/*
361	* Create the server handle.
362	*/
363	PRTTCPSERVER pServer = (PRTTCPSERVER)RTMemAllocZ(sizeof(*pServer));
364	if (pServer)
365	{
366	pServer->SockServer = WaitSock;
367	pServer->SockClient = NIL_RTSOCKET;
368	pServer->Thread = NIL_RTTHREAD;
369	pServer->enmState = RTTCPSERVERSTATE_CREATED;
370	*ppServer = pServer;
371	return VINF_SUCCESS;
372	}
373	else
374	rc = VERR_NO_MEMORY;
375	}
376	else
377	{
378	rc = rtTcpError();
379	AssertMsgFailed(("listen() %Vrc\n", rc));
380	}
381	}
382	else
383	{
384	rc = rtTcpError();
385	}
386	}
387	else
388	{
389	rc = rtTcpError();
390	AssertMsgFailed(("setsockopt() %Vrc\n", rc));
391	}
392	rtTcpClose(WaitSock, "RTServerCreateEx");
393	}
394	else
395	{
396	rc = rtTcpError();
397	AssertMsgFailed(("socket() %Vrc\n", rc));
398	}
399
400	return rc;
401	}
402
403
404	/**
405	* Listen for incoming connections.
406	*
407	* The function will loop accepting connections and call pfnServe for
408	* each of the incoming connections in turn. The pfnServe function can
409	* return VERR_TCP_SERVER_STOP too terminate this loop. A stopped server
410	* can only be destroyed.
411	*
412	* @returns iprt status code.
413	* @param pServer The server handle as returned from RTTcpServerCreateEx().
414	* @param pfnServe The function which will serve a new client connection.
415	* @param pvUser User argument passed to pfnServe.
416	*/
417	RTR3DECL(int) RTTcpServerListen(PRTTCPSERVER pServer, PFNRTTCPSERVE pfnServe, void *pvUser)
418	{
419	/*
420	* Validate input.
421	*/
422	if (!pfnServe \|\| !pServer)
423	{
424	AssertMsgFailed(("pfnServer=%p pServer=%p\n", pfnServe, pServer));
425	return VERR_INVALID_PARAMETER;
426	}
427	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, RTTCPSERVERSTATE_CREATED))
428	{
429	Assert(!pServer->pfnServe);
430	Assert(!pServer->pvUser);
431	Assert(pServer->Thread == NIL_RTTHREAD);
432	Assert(pServer->SockClient == NIL_RTSOCKET);
433
434	pServer->pfnServe = pfnServe;
435	pServer->pvUser = pvUser;
436	pServer->Thread = RTThreadSelf();
437	Assert(pServer->Thread != NIL_RTTHREAD);
438	return rtTcpServerListen(pServer);
439	}
440	AssertMsgFailed(("pServer->enmState=%d\n", pServer->enmState));
441	return VERR_INVALID_PARAMETER;
442	}
443
444
445	/**
446	* Closes the client socket.
447	*/
448	static int rtTcpServerDestroyClientSock(RTSOCKET volatile pSock, const char pszMsg)
449	{
450	RTSOCKET Sock = rtTcpAtomicXchgSock(pSock, NIL_RTSOCKET);
451	if (Sock != NIL_RTSOCKET)
452	shutdown(Sock, SHUT_RDWR);
453	return rtTcpClose(Sock, pszMsg);
454	}
455
456
457	/**
458	* Internal worker common for RTTcpServerListen and the thread created by RTTcpServerCreate().
459	*/
460	static int rtTcpServerListen(PRTTCPSERVER pServer)
461	{
462	/*
463	* Accept connection loop.
464	*/
465	int rc = VINF_SUCCESS;
466	for (;;)
467	{
468	/*
469	* Change state.
470	*/
471	RTTCPSERVERSTATE enmState = pServer->enmState;
472	if ( enmState != RTTCPSERVERSTATE_ACCEPTING
473	&& enmState != RTTCPSERVERSTATE_SERVING)
474	break;
475	if (!rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, enmState))
476	continue;
477
478	/*
479	* Accept connection.
480	*/
481	struct sockaddr_in RemoteAddr = {0};
482	socklen_t Len = sizeof(RemoteAddr);
483	RTSOCKET Socket = accept(pServer->SockServer, (struct sockaddr *)&RemoteAddr, &Len);
484	if (Socket == -1)
485	{
486	#ifndef RT_OS_WINDOWS
487	/* These are typical for what can happen during destruction. */
488	if (errno == EBADF \|\| errno == EINVAL \|\| errno == ENOTSOCK)
489	break;
490	#endif
491	continue;
492	}
493
494	/*
495	* Run a pfnServe callback.
496	*/
497	if (!rtTcpServerSetState(pServer, RTTCPSERVERSTATE_SERVING, RTTCPSERVERSTATE_ACCEPTING))
498	break;
499	rtTcpAtomicXchgSock(&pServer->SockClient, Socket);
500	rc = pServer->pfnServe(Socket, pServer->pvUser);
501	rtTcpServerDestroyClientSock(&pServer->SockClient, "Listener: client");
502
503	/*
504	* Stop the server?
505	*/
506	if (rc == VERR_TCP_SERVER_STOP)
507	{
508	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_STOPPING, RTTCPSERVERSTATE_SERVING))
509	{
510	/*
511	* Reset the server socket and change the state to stopped. After that state change
512	* we cannot safely access the handle so we'll have to return here.
513	*/
514	RTSOCKET SockServer = rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET);
515	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_STOPPED, RTTCPSERVERSTATE_STOPPING);
516	rtTcpClose(SockServer, "Listener: server stopped");
517	return rc;
518	}
519	break;
520	}
521	}
522
523	/*
524	* Perform any pending clean and be gone.
525	*/
526	rcTcpServerListenCleanup(pServer);
527	return rc;
528	}
529
530
531	/**
532	* Clean up after listener.
533	*/
534	static void rcTcpServerListenCleanup(PRTTCPSERVER pServer)
535	{
536	/*
537	* Wait for any destroyers to finish signaling us.
538	*/
539	for (unsigned cTries = 99; cTries > 0; cTries--)
540	{
541	RTTCPSERVERSTATE enmState = pServer->enmState;
542	switch (enmState)
543	{
544	/*
545	* Intermediate state while the destroyer closes the client socket.
546	*/
547	case RTTCPSERVERSTATE_SIGNALING:
548	if (!RTThreadYield())
549	RTThreadSleep(1);
550	break;
551
552	/*
553	* Free the handle.
554	*/
555	case RTTCPSERVERSTATE_DESTROYING:
556	{
557	rtTcpClose(rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET), "Listener-cleanup: server");
558	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_FREED, RTTCPSERVERSTATE_DESTROYING);
559	RTMemFree(pServer);
560	return;
561	}
562
563	/*
564	* Everything else means failure.
565	*/
566	default:
567	AssertMsgFailed(("pServer=%p enmState=%d\n", pServer, enmState));
568	return;
569	}
570	}
571	AssertMsgFailed(("Timed out when trying to clean up after listener. pServer=%p enmState=%d\n", pServer, pServer->enmState));
572	}
573
574
575	/**
576	* Terminate the open connection to the server.
577	*
578	* @returns iprt status code.
579	* @param pServer Handle to the server.
580	*/
581	RTR3DECL(int) RTTcpServerDisconnectClient(PRTTCPSERVER pServer)
582	{
583	/*
584	* Validate input.
585	*/
586	if ( !pServer
587	\|\| pServer->enmState <= RTTCPSERVERSTATE_INVALID
588	\|\| pServer->enmState >= RTTCPSERVERSTATE_FREED)
589	{
590	AssertMsgFailed(("Invalid parameter!\n"));
591	return VERR_INVALID_PARAMETER;
592	}
593
594	return rtTcpServerDestroyClientSock(&pServer->SockClient, "DisconnectClient: client");
595	}
596
597
598	/**
599	* Closes down and frees a TCP Server.
600	* This will also terminate any open connections to the server.
601	*
602	* @returns iprt status code.
603	* @param pServer Handle to the server.
604	*/
605	RTR3DECL(int) RTTcpServerDestroy(PRTTCPSERVER pServer)
606	{
607	/*
608	* Validate input.
609	*/
610	if ( !pServer
611	\|\| pServer->enmState <= RTTCPSERVERSTATE_INVALID
612	\|\| pServer->enmState >= RTTCPSERVERSTATE_FREED)
613	{
614	AssertMsgFailed(("Invalid parameter!\n"));
615	return VERR_INVALID_PARAMETER;
616	}
617
618	/** @todo r=bird: Some of this horrible code can probably be exchanged with a RTThreadWait(). (It didn't exist when this code was written.) */
619
620	/*
621	* Move it to the destroying state.
622	*/
623	RTSOCKET SockServer = rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET);
624	for (unsigned cTries = 99; cTries > 0; cTries--)
625	{
626	RTTCPSERVERSTATE enmState = pServer->enmState;
627	switch (enmState)
628	{
629	/*
630	* Try move it to the destroying state.
631	*/
632	case RTTCPSERVERSTATE_STARTING:
633	case RTTCPSERVERSTATE_ACCEPTING:
634	case RTTCPSERVERSTATE_SERVING:
635	{
636	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_SIGNALING, enmState))
637	{
638	/* client */
639	rtTcpServerDestroyClientSock(&pServer->SockClient, "Destroyer: client");
640
641	bool fRc = rtTcpServerSetState(pServer, RTTCPSERVERSTATE_DESTROYING, RTTCPSERVERSTATE_SIGNALING);
642	Assert(fRc); NOREF(fRc);
643
644	/* server */
645	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server destroying");
646	RTThreadYield();
647
648	return VINF_SUCCESS;
649	}
650	break;
651	}
652
653
654	/*
655	* Intermediate state.
656	*/
657	case RTTCPSERVERSTATE_STOPPING:
658	if (!RTThreadYield())
659	RTThreadSleep(1);
660	break;
661
662	/*
663	* Just release the handle.
664	*/
665	case RTTCPSERVERSTATE_CREATED:
666	case RTTCPSERVERSTATE_STOPPED:
667	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_FREED, enmState))
668	{
669	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server freeing");
670	RTMemFree(pServer);
671	return VINF_TCP_SERVER_STOP;
672	}
673	break;
674
675	/*
676	* Everything else means failure.
677	*/
678	default:
679	AssertMsgFailed(("pServer=%p enmState=%d\n", pServer, enmState));
680	return VERR_INTERNAL_ERROR;
681	}
682	}
683
684	AssertMsgFailed(("Giving up! pServer=%p enmState=%d\n", pServer, pServer->enmState));
685	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server timeout");
686	return VERR_INTERNAL_ERROR;
687	}
688
689
690	/**
691	* Shutdowns the server socket.
692	*/
693	static void rtTcpServerDestroyServerSock(RTSOCKET SockServer, const char *pszMsg)
694	{
695	if (SockServer == NIL_RTSOCKET)
696	return;
697	shutdown(SockServer, SHUT_RDWR);
698	rtTcpClose(SockServer, "Destroyer: server destroying");
699	}
700
701
702
703	RTR3DECL(int) RTTcpRead(RTSOCKET Sock, void pvBuffer, size_t cbBuffer, size_t pcbRead)
704	{
705	/*
706	* Do params checking
707	*/
708	if (!pvBuffer \|\| !cbBuffer)
709	{
710	AssertMsgFailed(("Invalid params\n"));
711	return VERR_INVALID_PARAMETER;
712	}
713
714	/*
715	* Read loop.
716	* If pcbRead is NULL we have to fill the entire buffer!
717	*/
718	size_t cbRead = 0;
719	size_t cbToRead = cbBuffer;
720	for (;;)
721	{
722	ssize_t cbBytesRead = recv(Sock, (char *)pvBuffer + cbRead, cbToRead, MSG_NOSIGNAL);
723	if (cbBytesRead < 0)
724	return rtTcpError();
725	if (cbBytesRead == 0 && rtTcpError())
726	return rtTcpError();
727	if (pcbRead)
728	{
729	/* return partial data */
730	*pcbRead = cbBytesRead;
731	break;
732	}
733
734	/* read more? */
735	cbRead += cbBytesRead;
736	if (cbRead == cbBuffer)
737	break;
738
739	/* next */
740	cbToRead = cbBuffer - cbRead;
741	}
742
743	return VINF_SUCCESS;
744	}
745
746
747	RTR3DECL(int) RTTcpWrite(RTSOCKET Sock, const void *pvBuffer, size_t cbBuffer)
748	{
749	do
750	{
751	ssize_t cbWritten = send(Sock, (const char *)pvBuffer, cbBuffer, MSG_NOSIGNAL);
752	if (cbWritten < 0)
753	return rtTcpError();
754	AssertMsg(cbBuffer >= (size_t)cbWritten, ("Wrote more than we requested!!! cbWritten=%d cbBuffer=%d rtTcpError()=%d\n",
755	cbWritten, cbBuffer, rtTcpError()));
756	cbBuffer -= cbWritten;
757	pvBuffer = (char *)pvBuffer + cbWritten;
758	} while (cbBuffer);
759
760	return VINF_SUCCESS;
761	}
762
763
764	RTR3DECL(int) RTTcpFlush(RTSOCKET Sock)
765	{
766	int fFlag = 1;
767	setsockopt(Sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&fFlag, sizeof(fFlag));
768	fFlag = 0;
769	setsockopt(Sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&fFlag, sizeof(fFlag));
770
771	return VINF_SUCCESS;
772	}
773
774
775	RTR3DECL(int) RTTcpSelectOne(RTSOCKET Sock, unsigned cMillies)
776	{
777	fd_set fdsetR;
778	FD_ZERO(&fdsetR);
779	FD_SET(Sock, &fdsetR);
780
781	fd_set fdsetE = fdsetR;
782
783	int rc;
784	if (cMillies == RT_INDEFINITE_WAIT)
785	rc = select(Sock + 1, &fdsetR, NULL, &fdsetE, NULL);
786	else
787	{
788	struct timeval timeout;
789	timeout.tv_sec = cMillies / 1000;
790	timeout.tv_usec = (cMillies % 1000) * 1000;
791	rc = select(Sock + 1, &fdsetR, NULL, &fdsetE, &timeout);
792	}
793	if (rc > 0)
794	return VINF_SUCCESS;
795	if (rc == 0)
796	return VERR_TIMEOUT;
797	return rtTcpError();
798	}
799
800
801	RTR3DECL(int) RTTcpClientConnect(const char *pszAddress, uint32_t uPort, PRTSOCKET pSock)
802	{
803	int rc;
804
805	/*
806	* Do params checking
807	*/
808	AssertReturn(uPort, VERR_INVALID_PARAMETER);
809	AssertReturn(VALID_PTR(pszAddress), VERR_INVALID_PARAMETER);
810
811	#ifdef RT_OS_WINDOWS
812	/*
813	* Initialize WinSock and check version.
814	*/
815	WORD wVersionRequested = MAKEWORD(1, 1);
816	WSADATA wsaData;
817	rc = WSAStartup(wVersionRequested, &wsaData);
818	if (wsaData.wVersion != wVersionRequested)
819	{
820	AssertMsgFailed(("Wrong winsock version\n"));
821	return VERR_NOT_SUPPORTED;
822	}
823	#endif
824
825	/*
826	* Resolve the address.
827	*/
828	struct hostent *pHostEnt = NULL;
829	pHostEnt = gethostbyname(pszAddress);
830	if (!pHostEnt)
831	{
832	struct in_addr InAddr;
833	InAddr.s_addr = inet_addr(pszAddress);
834	pHostEnt = gethostbyaddr((char *)&InAddr, 4, AF_INET);
835	if (!pHostEnt)
836	{
837	rc = rtTcpError();
838	AssertMsgFailed(("Could not resolve '%s', rc=%Vrc\n", pszAddress, rc));
839	return rc;
840	}
841	}
842
843	/*
844	* Create the socket and connect.
845	*/
846	RTSOCKET Sock = socket(PF_INET, SOCK_STREAM, 0);
847	if (Sock != -1)
848	{
849	struct sockaddr_in InAddr = {0};
850	InAddr.sin_family = AF_INET;
851	InAddr.sin_port = htons(uPort);
852	InAddr.sin_addr = ((struct in_addr )pHostEnt->h_addr);
853	if (!connect(Sock, (struct sockaddr *)&InAddr, sizeof(InAddr)))
854	{
855	*pSock = Sock;
856	return VINF_SUCCESS;
857	}
858	rc = rtTcpError();
859	rtTcpClose(Sock, "RTTcpClientConnect");
860	}
861	else
862	rc = rtTcpError();
863	return rc;
864	}
865
866
867	RTR3DECL(int) RTTcpClientClose(RTSOCKET Sock)
868	{
869	return rtTcpClose(Sock, "RTTcpClientClose");
870	}
871
872
873	/**
874	* Internal close function which does all the proper bitching.
875	*/
876	static int rtTcpClose(RTSOCKET Sock, const char *pszMsg)
877	{
878	/* ignore nil handles. */
879	if (Sock == NIL_RTSOCKET)
880	return VINF_SUCCESS;
881
882	/*
883	* Attempt to close it.
884	*/
885	#ifdef RT_OS_WINDOWS
886	int rc = closesocket(Sock);
887	#else
888	int rc = close(Sock);
889	#endif
890	if (!rc)
891	return VINF_SUCCESS;
892	rc = rtTcpError();
893	AssertMsgFailed(("\"%s\": close(%d) -> %Vrc\n", pszMsg, Sock, rc));
894	return rc;
895	}
896

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source: vbox/trunk/src/VBox/Runtime/r3/tcp.cpp@ 11118

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