tcp.cpp@ 4512

Last change on this file since 4512 was 4071, checked in by vboxsync, 17 years ago
Biggest check-in ever. New source code headers for all (C) innotek files.
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File size: 25.3 KB

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1	/* $Id: tcp.cpp 4071 2007-08-07 17:07:59Z vboxsync $ */
2	/** @file
3	* innotek Portable Runtime - TCP/IP.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 innotek GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#ifdef RT_OS_WINDOWS
23	#include <winsock.h>
24	#else /* !RT_OS_WINDOWS */
25	#include <errno.h>
26	#include <sys/stat.h>
27	#include <sys/socket.h>
28	#include <netinet/in.h>
29	#include <netinet/tcp.h>
30	#include <arpa/inet.h>
31	#include <sys/un.h>
32	#include <netdb.h>
33	#include <unistd.h>
34	#endif /* !RT_OS_WINDOWS */
35
36	#include <iprt/tcp.h>
37	#include <iprt/thread.h>
38	#include <iprt/alloc.h>
39	#include <iprt/assert.h>
40	#include <iprt/asm.h>
41	#include <iprt/err.h>
42	#include <iprt/string.h>
43
44
45	/* non-standard linux stuff (it seems). */
46	#ifndef MSG_NOSIGNAL
47	# define MSG_NOSIGNAL 0
48	#endif
49	#ifndef SHUT_RDWR
50	# ifdef SD_BOTH
51	# define SHUT_RDWR SD_BOTH
52	# else
53	# define SHUT_RDWR 2
54	# endif
55	#endif
56
57	/* fixup backlevel OSes. */
58	#if defined(RT_OS_OS2) \|\| defined(RT_OS_WINDOWS)
59	# define socklen_t int
60	#endif
61
62
63	/*******************************************************************************
64	* Defined Constants And Macros *
65	*******************************************************************************/
66	#define BACKLOG 10 /* how many pending connections queue will hold */
67
68
69	/*******************************************************************************
70	* Structures and Typedefs *
71	*******************************************************************************/
72	/**
73	* TCP Server state.
74	*/
75	typedef enum RTTCPSERVERSTATE
76	{
77	/** Invalid. */
78	RTTCPSERVERSTATE_INVALID = 0,
79	/** Created. */
80	RTTCPSERVERSTATE_CREATED,
81	/** Listener thread is starting up. */
82	RTTCPSERVERSTATE_STARTING,
83	/** Accepting client connections. */
84	RTTCPSERVERSTATE_ACCEPTING,
85	/** Serving a client. */
86	RTTCPSERVERSTATE_SERVING,
87	/** Listener terminating. */
88	RTTCPSERVERSTATE_STOPPING,
89	/** Listener terminated. */
90	RTTCPSERVERSTATE_STOPPED,
91	/** Destroying signaling to the listener, listener will wait. */
92	RTTCPSERVERSTATE_SIGNALING,
93	/** Listener cleans up. */
94	RTTCPSERVERSTATE_DESTROYING,
95	/** Freed. */
96	RTTCPSERVERSTATE_FREED
97	} RTTCPSERVERSTATE;
98
99	/*
100	* Internal representation of the TCP Server handle.
101	*/
102	typedef struct RTTCPSERVER
103	{
104	/** The server state. */
105	RTTCPSERVERSTATE volatile enmState;
106	/** The server thread. */
107	RTTHREAD Thread;
108	/** The server socket. */
109	RTSOCKET volatile SockServer;
110	/** The socket to the client currently being serviced.
111	* This is NIL_RTSOCKET when no client is serviced. */
112	RTSOCKET volatile SockClient;
113	/** The connection function. */
114	PFNRTTCPSERVE pfnServe;
115	/** Argument to pfnServer. */
116	void *pvUser;
117	} RTTCPSERVER;
118
119
120	/*******************************************************************************
121	* Internal Functions *
122	*******************************************************************************/
123	static DECLCALLBACK(int) rtTcpServerThread(RTTHREAD ThreadSelf, void *pvServer);
124	static int rtTcpServerListen(PRTTCPSERVER pServer);
125	static void rcTcpServerListenCleanup(PRTTCPSERVER pServer);
126	static void rtTcpServerDestroyServerSock(RTSOCKET SockServer, const char *pszMsg);
127	static int rtTcpClose(RTSOCKET Sock, const char *pszMsg);
128
129
130
131	/**
132	* Get the last error as an iprt status code.
133	* @returns iprt status code.
134	*/
135	DECLINLINE(int) rtTcpError(void)
136	{
137	#ifdef RT_OS_WINDOWS
138	return RTErrConvertFromWin32(WSAGetLastError());
139	#else
140	return RTErrConvertFromErrno(errno);
141	#endif
142	}
143
144
145	/**
146	* Atomicly updates a socket variable.
147	* @returns The old value.
148	* @param pSock The socket variable to update.
149	* @param Sock The new value.
150	*/
151	DECLINLINE(RTSOCKET) rtTcpAtomicXchgSock(RTSOCKET volatile *pSock, const RTSOCKET Sock)
152	{
153	switch (sizeof(RTSOCKET))
154	{
155	case 4: return (RTSOCKET)ASMAtomicXchgS32((int32_t volatile *)pSock, (int32_t)Sock);
156	default:
157	AssertReleaseFailed();
158	return NIL_RTSOCKET;
159	}
160	}
161
162
163	/**
164	* Changes the TCP server state.
165	*/
166	DECLINLINE(bool) rtTcpServerSetState(PRTTCPSERVER pServer, RTTCPSERVERSTATE enmStateNew, RTTCPSERVERSTATE enmStateOld)
167	{
168	bool fRc;
169	ASMAtomicCmpXchgSize(&pServer->enmState, enmStateNew, enmStateOld, fRc);
170	return fRc;
171	}
172
173
174	/**
175	* Create single connection at a time TCP Server in a separate thread.
176	*
177	* The thread will loop accepting connections and call pfnServe for
178	* each of the incoming connections in turn. The pfnServe function can
179	* return VERR_TCP_SERVER_STOP too terminate this loop. RTTcpServerDestroy()
180	* should be used to terminate the server.
181	*
182	* @returns iprt status code.
183	* @param pszAddress The address for creating a listening socket.
184	* If NULL or empty string the server is bound to all interfaces.
185	* @param uPort The port for creating a listening socket.
186	* @param enmType The thread type.
187	* @param pszThrdName The name of the worker thread.
188	* @param pfnServe The function which will serve a new client connection.
189	* @param pvUser User argument passed to pfnServe.
190	* @param ppServer Where to store the serverhandle.
191	*/
192	RTR3DECL(int) RTTcpServerCreate(const char pszAddress, unsigned uPort, RTTHREADTYPE enmType, const char pszThrdName,
193	PFNRTTCPSERVE pfnServe, void *pvUser, PPRTTCPSERVER ppServer)
194	{
195	/*
196	* Do params checking
197	*/
198	if (!uPort \|\| !pfnServe \|\| !pszThrdName \|\| !ppServer)
199	{
200	AssertMsgFailed(("Invalid params\n"));
201	return VERR_INVALID_PARAMETER;
202	}
203
204	/*
205	* Create the server.
206	*/
207	PRTTCPSERVER pServer;
208	int rc = RTTcpServerCreateEx(pszAddress, uPort, &pServer);
209	if (RT_SUCCESS(rc))
210	{
211	/*
212	* Create the listener thread.
213	*/
214	pServer->enmState = RTTCPSERVERSTATE_STARTING;
215	pServer->pvUser = pvUser;
216	pServer->pfnServe = pfnServe;
217	rc = RTThreadCreate(&pServer->Thread, rtTcpServerThread, pServer, 0, enmType, /RTTHREADFLAGS_WAITABLE/0, pszThrdName);
218	if (RT_SUCCESS(rc))
219	{
220	/* done */
221	if (ppServer)
222	*ppServer = pServer;
223	return rc;
224	}
225
226	/*
227	* Destroy the server.
228	*/
229	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_CREATED, RTTCPSERVERSTATE_STARTING);
230	RTTcpServerDestroy(pServer);
231	}
232
233	return rc;
234	}
235
236
237	/**
238	* Server thread, loops accepting connections until it's terminated.
239	*
240	* @returns iprt status code. (ignored).
241	* @param ThreadSelf Thread handle.
242	* @param pvServer Server handle.
243	*/
244	static DECLCALLBACK(int) rtTcpServerThread(RTTHREAD ThreadSelf, void *pvServer)
245	{
246	PRTTCPSERVER pServer = (PRTTCPSERVER)pvServer;
247	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, RTTCPSERVERSTATE_STARTING))
248	return rtTcpServerListen(pServer);
249	rcTcpServerListenCleanup(pServer);
250	NOREF(ThreadSelf);
251	return VINF_SUCCESS;
252	}
253
254
255	/**
256	* Create single connection at a time TCP Server.
257	* The caller must call RTTcpServerListen() to actually start the server.
258	*
259	* @returns iprt status code.
260	* @param pszAddress The address for creating a listening socket.
261	* If NULL the server is bound to all interfaces.
262	* @param uPort The port for creating a listening socket.
263	* @param ppServer Where to store the serverhandle.
264	*/
265	RTR3DECL(int) RTTcpServerCreateEx(const char *pszAddress, uint32_t uPort, PPRTTCPSERVER ppServer)
266	{
267	int rc;
268
269	/*
270	* Do params checking
271	*/
272	if (!uPort \|\| !ppServer)
273	{
274	AssertMsgFailed(("Invalid params\n"));
275	return VERR_INVALID_PARAMETER;
276	}
277
278	#ifdef RT_OS_WINDOWS
279	/*
280	* Initialize WinSock and check version.
281	*/
282	WORD wVersionRequested = MAKEWORD(1, 1);
283	WSADATA wsaData;
284	rc = WSAStartup(wVersionRequested, &wsaData);
285	if (wsaData.wVersion != wVersionRequested)
286	{
287	AssertMsgFailed(("Wrong winsock version\n"));
288	return VERR_NOT_SUPPORTED;
289	}
290	#endif
291
292	/*
293	* Get host listening address.
294	*/
295	struct hostent *pHostEnt = NULL;
296	if (pszAddress != NULL && *pszAddress)
297	{
298	pHostEnt = gethostbyname(pszAddress);
299	if (!pHostEnt)
300	{
301	struct in_addr InAddr;
302	InAddr.s_addr = inet_addr(pszAddress);
303	pHostEnt = gethostbyaddr((char *)&InAddr, 4, AF_INET);
304	if (!pHostEnt)
305	{
306	rc = rtTcpError();
307	AssertMsgFailed(("Could not get host address rc=%Vrc\n", rc));
308	return rc;
309	}
310	}
311	}
312
313	/*
314	* Setting up socket.
315	*/
316	RTSOCKET WaitSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
317	if (WaitSock != -1)
318	{
319	/*
320	* Set socket options.
321	*/
322	int fFlag = 1;
323	if (!setsockopt(WaitSock, SOL_SOCKET, SO_REUSEADDR, (const char *)&fFlag, sizeof(fFlag)))
324	{
325	/*
326	* Set socket family, address and port.
327	*/
328	struct sockaddr_in LocalAddr = {0};
329	LocalAddr.sin_family = AF_INET;
330	LocalAddr.sin_port = htons(uPort);
331	/* if address not specified, use INADDR_ANY. */
332	if (!pHostEnt)
333	LocalAddr.sin_addr.s_addr = INADDR_ANY;
334	else
335	LocalAddr.sin_addr = ((struct in_addr )pHostEnt->h_addr);
336
337	/*
338	* Bind a name to a socket.
339	*/
340	if (bind(WaitSock, (struct sockaddr *)&LocalAddr, sizeof(LocalAddr)) != -1)
341	{
342	/*
343	* Listen for connections on a socket.
344	*/
345	if (listen(WaitSock, BACKLOG) != -1)
346	{
347	/*
348	* Create the server handle.
349	*/
350	PRTTCPSERVER pServer = (PRTTCPSERVER)RTMemAllocZ(sizeof(*pServer));
351	if (pServer)
352	{
353	pServer->SockServer = WaitSock;
354	pServer->SockClient = NIL_RTSOCKET;
355	pServer->Thread = NIL_RTTHREAD;
356	pServer->enmState = RTTCPSERVERSTATE_CREATED;
357	*ppServer = pServer;
358	return VINF_SUCCESS;
359	}
360	else
361	rc = VERR_NO_MEMORY;
362	}
363	else
364	{
365	rc = rtTcpError();
366	AssertMsgFailed(("listen() %Vrc\n", rc));
367	}
368	}
369	else
370	{
371	rc = rtTcpError();
372	}
373	}
374	else
375	{
376	rc = rtTcpError();
377	AssertMsgFailed(("setsockopt() %Vrc\n", rc));
378	}
379	rtTcpClose(WaitSock, "RTServerCreateEx");
380	}
381	else
382	{
383	rc = rtTcpError();
384	AssertMsgFailed(("socket() %Vrc\n", rc));
385	}
386
387	return rc;
388	}
389
390
391	/**
392	* Listen for incoming connections.
393	*
394	* The function will loop accepting connections and call pfnServe for
395	* each of the incoming connections in turn. The pfnServe function can
396	* return VERR_TCP_SERVER_STOP too terminate this loop. A stopped server
397	* can only be destroyed.
398	*
399	* @returns iprt status code.
400	* @param pServer The server handle as returned from RTTcpServerCreateEx().
401	* @param pfnServe The function which will serve a new client connection.
402	* @param pvUser User argument passed to pfnServe.
403	*/
404	RTR3DECL(int) RTTcpServerListen(PRTTCPSERVER pServer, PFNRTTCPSERVE pfnServe, void *pvUser)
405	{
406	/*
407	* Validate input.
408	*/
409	if (!pfnServe \|\| !pServer)
410	{
411	AssertMsgFailed(("pfnServer=%p pServer=%p\n", pfnServe, pServer));
412	return VERR_INVALID_PARAMETER;
413	}
414	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, RTTCPSERVERSTATE_CREATED))
415	{
416	Assert(!pServer->pfnServe);
417	Assert(!pServer->pvUser);
418	Assert(pServer->Thread == NIL_RTTHREAD);
419	Assert(pServer->SockClient == NIL_RTSOCKET);
420
421	pServer->pfnServe = pfnServe;
422	pServer->pvUser = pvUser;
423	pServer->Thread = RTThreadSelf();
424	Assert(pServer->Thread != NIL_RTTHREAD);
425	return rtTcpServerListen(pServer);
426	}
427	AssertMsgFailed(("pServer->enmState=%d\n", pServer->enmState));
428	return VERR_INVALID_PARAMETER;
429	}
430
431
432	/**
433	* Closes the client socket.
434	*/
435	static int rtTcpServerDestroyClientSock(RTSOCKET volatile pSock, const char pszMsg)
436	{
437	RTSOCKET Sock = rtTcpAtomicXchgSock(pSock, NIL_RTSOCKET);
438	if (Sock != NIL_RTSOCKET)
439	shutdown(Sock, SHUT_RDWR);
440	return rtTcpClose(Sock, pszMsg);
441	}
442
443
444	/**
445	* Internal worker common for RTTcpServerListen and the thread created by RTTcpServerCreate().
446	*/
447	static int rtTcpServerListen(PRTTCPSERVER pServer)
448	{
449	/*
450	* Accept connection loop.
451	*/
452	int rc = VINF_SUCCESS;
453	for (;;)
454	{
455	/*
456	* Change state.
457	*/
458	RTTCPSERVERSTATE enmState = pServer->enmState;
459	if ( enmState != RTTCPSERVERSTATE_ACCEPTING
460	&& enmState != RTTCPSERVERSTATE_SERVING)
461	break;
462	if (!rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, enmState))
463	continue;
464
465	/*
466	* Accept connection.
467	*/
468	struct sockaddr_in RemoteAddr = {0};
469	socklen_t Len = sizeof(RemoteAddr);
470	RTSOCKET Socket = accept(pServer->SockServer, (struct sockaddr *)&RemoteAddr, &Len);
471	if (Socket == -1)
472	{
473	#ifndef RT_OS_WINDOWS
474	/* These are typical for what can happen during destruction. */
475	if (errno == EBADF \|\| errno == EINVAL \|\| errno == ENOTSOCK)
476	break;
477	#endif
478	continue;
479	}
480
481	/*
482	* Run a pfnServe callback.
483	*/
484	if (!rtTcpServerSetState(pServer, RTTCPSERVERSTATE_SERVING, RTTCPSERVERSTATE_ACCEPTING))
485	break;
486	rtTcpAtomicXchgSock(&pServer->SockClient, Socket);
487	rc = pServer->pfnServe(Socket, pServer->pvUser);
488	rtTcpServerDestroyClientSock(&pServer->SockClient, "Listener: client");
489
490	/*
491	* Stop the server?
492	*/
493	if (rc == VERR_TCP_SERVER_STOP)
494	{
495	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_STOPPING, RTTCPSERVERSTATE_SERVING))
496	{
497	/*
498	* Reset the server socket and change the state to stopped. After that state change
499	* we cannot safely access the handle so we'll have to return here.
500	*/
501	RTSOCKET SockServer = rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET);
502	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_STOPPED, RTTCPSERVERSTATE_STOPPING);
503	rtTcpClose(SockServer, "Listener: server stopped");
504	return rc;
505	}
506	break;
507	}
508	}
509
510	/*
511	* Perform any pending clean and be gone.
512	*/
513	rcTcpServerListenCleanup(pServer);
514	return rc;
515	}
516
517
518	/**
519	* Clean up after listener.
520	*/
521	static void rcTcpServerListenCleanup(PRTTCPSERVER pServer)
522	{
523	/*
524	* Wait for any destroyers to finish signaling us.
525	*/
526	for (unsigned cTries = 99; cTries > 0; cTries--)
527	{
528	RTTCPSERVERSTATE enmState = pServer->enmState;
529	switch (enmState)
530	{
531	/*
532	* Intermediate state while the destroyer closes the client socket.
533	*/
534	case RTTCPSERVERSTATE_SIGNALING:
535	if (!RTThreadYield())
536	RTThreadSleep(1);
537	break;
538
539	/*
540	* Free the handle.
541	*/
542	case RTTCPSERVERSTATE_DESTROYING:
543	{
544	rtTcpClose(rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET), "Listener-cleanup: server");
545	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_FREED, RTTCPSERVERSTATE_DESTROYING);
546	RTMemFree(pServer);
547	return;
548	}
549
550	/*
551	* Everything else means failure.
552	*/
553	default:
554	AssertMsgFailed(("pServer=%p enmState=%d\n", pServer, enmState));
555	return;
556	}
557	}
558	AssertMsgFailed(("Timed out when trying to clean up after listener. pServer=%p enmState=%d\n", pServer, pServer->enmState));
559	}
560
561
562	/**
563	* Terminate the open connection to the server.
564	*
565	* @returns iprt status code.
566	* @param pServer Handle to the server.
567	*/
568	RTR3DECL(int) RTTcpServerDisconnectClient(PRTTCPSERVER pServer)
569	{
570	/*
571	* Validate input.
572	*/
573	if ( !pServer
574	\|\| pServer->enmState <= RTTCPSERVERSTATE_INVALID
575	\|\| pServer->enmState >= RTTCPSERVERSTATE_FREED)
576	{
577	AssertMsgFailed(("Invalid parameter!\n"));
578	return VERR_INVALID_PARAMETER;
579	}
580
581	return rtTcpServerDestroyClientSock(&pServer->SockClient, "DisconnectClient: client");
582	}
583
584
585	/**
586	* Closes down and frees a TCP Server.
587	* This will also terminate any open connections to the server.
588	*
589	* @returns iprt status code.
590	* @param pServer Handle to the server.
591	*/
592	RTR3DECL(int) RTTcpServerDestroy(PRTTCPSERVER pServer)
593	{
594	/*
595	* Validate input.
596	*/
597	if ( !pServer
598	\|\| pServer->enmState <= RTTCPSERVERSTATE_INVALID
599	\|\| pServer->enmState >= RTTCPSERVERSTATE_FREED)
600	{
601	AssertMsgFailed(("Invalid parameter!\n"));
602	return VERR_INVALID_PARAMETER;
603	}
604
605	/** @todo r=bird: Some of this horrible code can probably be exchanged with a RTThreadWait(). (It didn't exist when this code was written.) */
606
607	/*
608	* Move it to the destroying state.
609	*/
610	RTSOCKET SockServer = rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET);
611	for (unsigned cTries = 99; cTries > 0; cTries--)
612	{
613	RTTCPSERVERSTATE enmState = pServer->enmState;
614	switch (enmState)
615	{
616	/*
617	* Try move it to the destroying state.
618	*/
619	case RTTCPSERVERSTATE_STARTING:
620	case RTTCPSERVERSTATE_ACCEPTING:
621	case RTTCPSERVERSTATE_SERVING:
622	{
623	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_SIGNALING, enmState))
624	{
625	/* client */
626	rtTcpServerDestroyClientSock(&pServer->SockClient, "Destroyer: client");
627
628	bool fRc = rtTcpServerSetState(pServer, RTTCPSERVERSTATE_DESTROYING, RTTCPSERVERSTATE_SIGNALING);
629	Assert(fRc); NOREF(fRc);
630
631	/* server */
632	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server destroying");
633	RTThreadYield();
634
635	return VINF_SUCCESS;
636	}
637	break;
638	}
639
640
641	/*
642	* Intermediate state.
643	*/
644	case RTTCPSERVERSTATE_STOPPING:
645	if (!RTThreadYield())
646	RTThreadSleep(1);
647	break;
648
649	/*
650	* Just release the handle.
651	*/
652	case RTTCPSERVERSTATE_CREATED:
653	case RTTCPSERVERSTATE_STOPPED:
654	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_FREED, enmState))
655	{
656	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server freeing");
657	RTMemFree(pServer);
658	return VINF_TCP_SERVER_STOP;
659	}
660	break;
661
662	/*
663	* Everything else means failure.
664	*/
665	default:
666	AssertMsgFailed(("pServer=%p enmState=%d\n", pServer, enmState));
667	return VERR_INTERNAL_ERROR;
668	}
669	}
670
671	AssertMsgFailed(("Giving up! pServer=%p enmState=%d\n", pServer, pServer->enmState));
672	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server timeout");
673	return VERR_INTERNAL_ERROR;
674	}
675
676
677	/**
678	* Shutdowns the server socket.
679	*/
680	static void rtTcpServerDestroyServerSock(RTSOCKET SockServer, const char *pszMsg)
681	{
682	if (SockServer == NIL_RTSOCKET)
683	return;
684	shutdown(SockServer, SHUT_RDWR);
685	rtTcpClose(SockServer, "Destroyer: server destroying");
686	}
687
688
689
690	RTR3DECL(int) RTTcpRead(RTSOCKET Sock, void pvBuffer, size_t cbBuffer, size_t pcbRead)
691	{
692	/*
693	* Do params checking
694	*/
695	if (!pvBuffer \|\| !cbBuffer)
696	{
697	AssertMsgFailed(("Invalid params\n"));
698	return VERR_INVALID_PARAMETER;
699	}
700
701	/*
702	* Read loop.
703	* If pcbRead is NULL we have to fill the entire buffer!
704	*/
705	size_t cbRead = 0;
706	size_t cbToRead = cbBuffer;
707	for (;;)
708	{
709	ssize_t cbBytesRead = recv(Sock, (char *)pvBuffer + cbRead, cbToRead, MSG_NOSIGNAL);
710	if (cbBytesRead < 0)
711	return rtTcpError();
712	if (cbBytesRead == 0 && rtTcpError())
713	return rtTcpError();
714	if (pcbRead)
715	{
716	/* return partial data */
717	*pcbRead = cbBytesRead;
718	break;
719	}
720
721	/* read more? */
722	cbRead += cbBytesRead;
723	if (cbRead == cbBuffer)
724	break;
725
726	/* next */
727	cbToRead = cbBuffer - cbRead;
728	}
729
730	return VINF_SUCCESS;
731	}
732
733
734	RTR3DECL(int) RTTcpWrite(RTSOCKET Sock, const void *pvBuffer, size_t cbBuffer)
735	{
736	do
737	{
738	ssize_t cbWritten = send(Sock, (const char *)pvBuffer, cbBuffer, MSG_NOSIGNAL);
739	if (cbWritten < 0)
740	return rtTcpError();
741	AssertMsg(cbBuffer >= (size_t)cbWritten, ("Wrote more than we requested!!! cbWritten=%d cbBuffer=%d rtTcpError()=%d\n",
742	cbWritten, cbBuffer, rtTcpError()));
743	cbBuffer -= cbWritten;
744	pvBuffer = (char *)pvBuffer + cbWritten;
745	} while (cbBuffer);
746
747	return VINF_SUCCESS;
748	}
749
750
751	RTR3DECL(int) RTTcpFlush(RTSOCKET Sock)
752	{
753	int fFlag = 1;
754	setsockopt(Sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&fFlag, sizeof(fFlag));
755	fFlag = 0;
756	setsockopt(Sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&fFlag, sizeof(fFlag));
757
758	return VINF_SUCCESS;
759	}
760
761
762	RTR3DECL(int) RTTcpSelectOne(RTSOCKET Sock, unsigned cMillies)
763	{
764	fd_set fdsetR;
765	FD_ZERO(&fdsetR);
766	FD_SET(Sock, &fdsetR);
767
768	fd_set fdsetE = fdsetR;
769
770	int rc;
771	if (cMillies == RT_INDEFINITE_WAIT)
772	rc = select(FD_SETSIZE, &fdsetR, NULL, &fdsetE, NULL);
773	else
774	{
775	struct timeval timeout;
776	timeout.tv_sec = cMillies / 1000;
777	timeout.tv_usec = (cMillies % 1000) * 1000;
778	rc = select(FD_SETSIZE, &fdsetR, NULL, &fdsetE, &timeout);
779	}
780	if (rc > 0)
781	return VINF_SUCCESS;
782	if (rc == 0)
783	return VERR_TIMEOUT;
784	return rtTcpError();
785	}
786
787
788	RTR3DECL(int) RTTcpClientConnect(const char *pszAddress, uint32_t uPort, PRTSOCKET pSock)
789	{
790	int rc;
791
792	/*
793	* Do params checking
794	*/
795	AssertReturn(uPort, VERR_INVALID_PARAMETER);
796	AssertReturn(VALID_PTR(pszAddress), VERR_INVALID_PARAMETER);
797
798	#ifdef RT_OS_WINDOWS
799	/*
800	* Initialize WinSock and check version.
801	*/
802	WORD wVersionRequested = MAKEWORD(1, 1);
803	WSADATA wsaData;
804	rc = WSAStartup(wVersionRequested, &wsaData);
805	if (wsaData.wVersion != wVersionRequested)
806	{
807	AssertMsgFailed(("Wrong winsock version\n"));
808	return VERR_NOT_SUPPORTED;
809	}
810	#endif
811
812	/*
813	* Resolve the address.
814	*/
815	struct hostent *pHostEnt = NULL;
816	pHostEnt = gethostbyname(pszAddress);
817	if (!pHostEnt)
818	{
819	struct in_addr InAddr;
820	InAddr.s_addr = inet_addr(pszAddress);
821	pHostEnt = gethostbyaddr((char *)&InAddr, 4, AF_INET);
822	if (!pHostEnt)
823	{
824	rc = rtTcpError();
825	AssertMsgFailed(("Could not resolve '%s', rc=%Vrc\n", pszAddress, rc));
826	return rc;
827	}
828	}
829
830	/*
831	* Create the socket and connect.
832	*/
833	RTSOCKET Sock = socket(AF_INET, SOCK_STREAM, 0);
834	if (Sock != -1)
835	{
836	struct sockaddr_in InAddr = {0};
837	InAddr.sin_family = AF_INET;
838	InAddr.sin_port = htons(uPort);
839	InAddr.sin_addr = ((struct in_addr )pHostEnt->h_addr);
840	if (!connect(Sock, (struct sockaddr *)&InAddr, sizeof(InAddr)))
841	{
842	*pSock = Sock;
843	return VINF_SUCCESS;
844	}
845	rc = rtTcpError();
846	rtTcpClose(Sock, "RTTcpClientConnect");
847	}
848	else
849	rc = rtTcpError();
850	return rc;
851	}
852
853
854	RTR3DECL(int) RTTcpClientClose(RTSOCKET Sock)
855	{
856	return rtTcpClose(Sock, "RTTcpClientClose");
857	}
858
859
860	/**
861	* Internal close function which does all the proper bitching.
862	*/
863	static int rtTcpClose(RTSOCKET Sock, const char *pszMsg)
864	{
865	/* ignore nil handles. */
866	if (Sock == NIL_RTSOCKET)
867	return VINF_SUCCESS;
868
869	/*
870	* Attempt to close it.
871	*/
872	#ifdef RT_OS_WINDOWS
873	int rc = closesocket(Sock);
874	#else
875	int rc = close(Sock);
876	#endif
877	if (!rc)
878	return VINF_SUCCESS;
879	rc = rtTcpError();
880	AssertMsgFailed(("\"%s\": close(%d) -> %Vrc\n", pszMsg, Sock, rc));
881	return rc;
882	}
883

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source: vbox/trunk/src/VBox/Runtime/r3/tcp.cpp@ 4512

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