tcp.cpp@ 331

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1	/* $Id: tcp.cpp 1 1970-01-01 00:00:00Z vboxsync $ */
2	/** @file
3	* InnoTek Portable Runtime - TCP/IP.
4	*/
5
6	/*
7	* Copyright (C) 2006 InnoTek Systemberatung 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	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#ifdef __WIN__
27	#include <winsock.h>
28	#else /* !__WIN__ */
29	#include <errno.h>
30	#include <sys/stat.h>
31	#include <sys/socket.h>
32	#include <netinet/in.h>
33	#include <netinet/tcp.h>
34	#include <arpa/inet.h>
35	#include <sys/un.h>
36	#include <netdb.h>
37	#include <unistd.h>
38	#endif /* !__WIN__ */
39
40	#include <iprt/tcp.h>
41	#include <iprt/thread.h>
42	#include <iprt/alloc.h>
43	#include <iprt/assert.h>
44	#include <iprt/asm.h>
45	#include <iprt/err.h>
46	#include <iprt/string.h>
47
48
49	/* non-standard linux stuff (it seems). */
50	#ifndef MSG_NOSIGNAL
51	# define MSG_NOSIGNAL 0
52	#endif
53	#ifndef SHUT_RDWR
54	# ifdef SD_BOTH
55	# define SHUT_RDWR SD_BOTH
56	# else
57	# define SHUT_RDWR 2
58	# endif
59	#endif
60
61	/* fixup backlevel OSes. */
62	#if defined(__OS2__) \|\| defined(__WIN__)
63	# define socklen_t int
64	#endif
65
66
67	/*******************************************************************************
68	* Defined Constants And Macros *
69	*******************************************************************************/
70	#define BACKLOG 10 /* how many pending connections queue will hold */
71
72
73	/*******************************************************************************
74	* Structures and Typedefs *
75	*******************************************************************************/
76	/**
77	* TCP Server state.
78	*/
79	typedef enum RTTCPSERVERSTATE
80	{
81	/** Invalid. */
82	RTTCPSERVERSTATE_INVALID = 0,
83	/** Created. */
84	RTTCPSERVERSTATE_CREATED,
85	/** Listener thread is starting up. */
86	RTTCPSERVERSTATE_STARTING,
87	/** Accepting client connections. */
88	RTTCPSERVERSTATE_ACCEPTING,
89	/** Serving a client. */
90	RTTCPSERVERSTATE_SERVING,
91	/** Listener terminating. */
92	RTTCPSERVERSTATE_STOPPING,
93	/** Listener terminated. */
94	RTTCPSERVERSTATE_STOPPED,
95	/** Destroying signaling to the listener, listener will wait. */
96	RTTCPSERVERSTATE_SIGNALING,
97	/** Listener cleans up. */
98	RTTCPSERVERSTATE_DESTROYING,
99	/** Freed. */
100	RTTCPSERVERSTATE_FREED
101	} RTTCPSERVERSTATE;
102
103	/*
104	* Internal representation of the TCP Server handle.
105	*/
106	typedef struct RTTCPSERVER
107	{
108	/** The server state. */
109	RTTCPSERVERSTATE volatile enmState;
110	/** The server thread. */
111	RTTHREAD Thread;
112	/** The server socket. */
113	RTSOCKET volatile SockServer;
114	/** The socket to the client currently being serviced.
115	* This is NIL_RTSOCKET when no client is serviced. */
116	RTSOCKET volatile SockClient;
117	/** The connection function. */
118	PFNRTTCPSERVE pfnServe;
119	/** Argument to pfnServer. */
120	void *pvUser;
121	} RTTCPSERVER;
122
123
124	/*******************************************************************************
125	* Internal Functions *
126	*******************************************************************************/
127	static DECLCALLBACK(int) rtTcpServerThread(RTTHREAD ThreadSelf, void *pvServer);
128	static int rtTcpServerListen(PRTTCPSERVER pServer);
129	static void rcTcpServerListenCleanup(PRTTCPSERVER pServer);
130	static void rtTcpServerDestroyServerSock(RTSOCKET SockServer, const char *pszMsg);
131	static int rtTcpClose(RTSOCKET Sock, const char *pszMsg);
132
133
134
135	/**
136	* Get the last error as an iprt status code.
137	* @returns iprt status code.
138	*/
139	inline int rtTcpError(void)
140	{
141	#ifdef __WIN__
142	return RTErrConvertFromWin32(WSAGetLastError());
143	#else
144	return RTErrConvertFromErrno(errno);
145	#endif
146	}
147
148
149	/**
150	* Atomicly updates a socket variable.
151	* @returns The old value.
152	* @param pSock The socket variable to update.
153	* @param Sock The new value.
154	*/
155	inline RTSOCKET rtTcpAtomicXchgSock(RTSOCKET volatile *pSock, const RTSOCKET Sock)
156	{
157	switch (sizeof(RTSOCKET))
158	{
159	case 4: return (RTSOCKET)ASMAtomicXchgS32((int32_t volatile *)pSock, (int32_t)Sock);
160	default:
161	AssertReleaseFailed();
162	return NIL_RTSOCKET;
163	}
164	}
165
166
167	/**
168	* Changes the TCP server state.
169	*/
170	inline bool rtTcpServerSetState(PRTTCPSERVER pServer, RTTCPSERVERSTATE enmStateNew, RTTCPSERVERSTATE enmStateOld)
171	{
172	bool fRc;
173	ASMAtomicCmpXchgSize(&pServer->enmState, enmStateNew, enmStateOld, fRc);
174	return fRc;
175	}
176
177
178	/**
179	* Create single connection at a time TCP Server in a separate thread.
180	*
181	* The thread will loop accepting connections and call pfnServe for
182	* each of the incoming connections in turn. The pfnServe function can
183	* return VERR_TCP_SERVER_STOP too terminate this loop. RTTcpServerDestroy()
184	* should be used to terminate the server.
185	*
186	* @returns iprt status code.
187	* @param pszAddress The address for creating a listening socket.
188	* If NULL or empty string the server is bound to all interfaces.
189	* @param uPort The port for creating a listening socket.
190	* @param enmType The thread type.
191	* @param pszThrdName The name of the worker thread.
192	* @param pfnServe The function which will serve a new client connection.
193	* @param pvUser User argument passed to pfnServe.
194	* @param ppServer Where to store the serverhandle.
195	*/
196	RTR3DECL(int) RTTcpServerCreate(const char pszAddress, unsigned uPort, RTTHREADTYPE enmType, const char pszThrdName,
197	PFNRTTCPSERVE pfnServe, void *pvUser, PPRTTCPSERVER ppServer)
198	{
199	/*
200	* Do params checking
201	*/
202	if (!uPort \|\| !pfnServe \|\| !pszThrdName \|\| !ppServer)
203	{
204	AssertMsgFailed(("Invalid params\n"));
205	return VERR_INVALID_PARAMETER;
206	}
207
208	/*
209	* Create the server.
210	*/
211	PRTTCPSERVER pServer;
212	int rc = RTTcpServerCreateEx(pszAddress, uPort, &pServer);
213	if (RT_SUCCESS(rc))
214	{
215	/*
216	* Create the listener thread.
217	*/
218	pServer->enmState = RTTCPSERVERSTATE_STARTING;
219	pServer->pvUser = pvUser;
220	pServer->pfnServe = pfnServe;
221	rc = RTThreadCreate(&pServer->Thread, rtTcpServerThread, pServer, 0, enmType, /RTTHREADFLAGS_WAITABLE/0, pszThrdName);
222	if (RT_SUCCESS(rc))
223	{
224	/* done */
225	if (ppServer)
226	*ppServer = pServer;
227	return rc;
228	}
229
230	/*
231	* Destroy the server.
232	*/
233	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_CREATED, RTTCPSERVERSTATE_STARTING);
234	RTTcpServerDestroy(pServer);
235	}
236
237	return rc;
238	}
239
240
241	/**
242	* Server thread, loops accepting connections until it's terminated.
243	*
244	* @returns iprt status code. (ignored).
245	* @param ThreadSelf Thread handle.
246	* @param pvServer Server handle.
247	*/
248	static DECLCALLBACK(int) rtTcpServerThread(RTTHREAD ThreadSelf, void *pvServer)
249	{
250	PRTTCPSERVER pServer = (PRTTCPSERVER)pvServer;
251	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, RTTCPSERVERSTATE_STARTING))
252	return rtTcpServerListen(pServer);
253	rcTcpServerListenCleanup(pServer);
254	NOREF(ThreadSelf);
255	return VINF_SUCCESS;
256	}
257
258
259	/**
260	* Create single connection at a time TCP Server.
261	* The caller must call RTTcpServerListen() to actually start the server.
262	*
263	* @returns iprt status code.
264	* @param pszAddress The address for creating a listening socket.
265	* If NULL the server is bound to all interfaces.
266	* @param uPort The port for creating a listening socket.
267	* @param ppServer Where to store the serverhandle.
268	*/
269	RTR3DECL(int) RTTcpServerCreateEx(const char *pszAddress, uint32_t uPort, PPRTTCPSERVER ppServer)
270	{
271	int rc;
272
273	/*
274	* Do params checking
275	*/
276	if (!uPort \|\| !ppServer)
277	{
278	AssertMsgFailed(("Invalid params\n"));
279	return VERR_INVALID_PARAMETER;
280	}
281
282	#ifdef __WIN__
283	/*
284	* Initialize WinSock and check version.
285	*/
286	WORD wVersionRequested = MAKEWORD(1, 1);
287	WSADATA wsaData;
288	rc = WSAStartup(wVersionRequested, &wsaData);
289	if (wsaData.wVersion != wVersionRequested)
290	{
291	AssertMsgFailed(("Wrong winsock version\n"));
292	return VERR_NOT_SUPPORTED;
293	}
294	#endif
295
296	/*
297	* Get host listening address.
298	*/
299	struct hostent *pHostEnt = NULL;
300	if (pszAddress != NULL && *pszAddress)
301	{
302	pHostEnt = gethostbyname(pszAddress);
303	if (!pHostEnt)
304	{
305	struct in_addr InAddr;
306	InAddr.s_addr = inet_addr(pszAddress);
307	pHostEnt = gethostbyaddr((char *)&InAddr, 4, AF_INET);
308	if (!pHostEnt)
309	{
310	rc = rtTcpError();
311	AssertMsgFailed(("Could not get host address rc=%Vrc\n", rc));
312	return rc;
313	}
314	}
315	}
316
317	/*
318	* Setting up socket.
319	*/
320	RTSOCKET WaitSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
321	if (WaitSock != -1)
322	{
323	/*
324	* Set socket options.
325	*/
326	int fFlag = 1;
327	if (!setsockopt(WaitSock, SOL_SOCKET, SO_REUSEADDR, (const char *)&fFlag, sizeof(fFlag)))
328	{
329	/*
330	* Set socket family, address and port.
331	*/
332	struct sockaddr_in LocalAddr = {0};
333	LocalAddr.sin_family = AF_INET;
334	LocalAddr.sin_port = htons(uPort);
335	/* if address not specified, use INADDR_ANY. */
336	if (!pHostEnt)
337	LocalAddr.sin_addr.s_addr = INADDR_ANY;
338	else
339	LocalAddr.sin_addr = ((struct in_addr )pHostEnt->h_addr);
340
341	/*
342	* Bind a name to a socket.
343	*/
344	if (bind(WaitSock, (struct sockaddr *)&LocalAddr, sizeof(LocalAddr)) != -1)
345	{
346	/*
347	* Listen for connections on a socket.
348	*/
349	if (listen(WaitSock, BACKLOG) != -1)
350	{
351	/*
352	* Create the server handle.
353	*/
354	PRTTCPSERVER pServer = (PRTTCPSERVER)RTMemAllocZ(sizeof(*pServer));
355	if (pServer)
356	{
357	pServer->SockServer = WaitSock;
358	pServer->SockClient = NIL_RTSOCKET;
359	pServer->Thread = NIL_RTTHREAD;
360	pServer->enmState = RTTCPSERVERSTATE_CREATED;
361	*ppServer = pServer;
362	return VINF_SUCCESS;
363	}
364	else
365	rc = VERR_NO_MEMORY;
366	}
367	else
368	{
369	rc = rtTcpError();
370	AssertMsgFailed(("listen() %Vrc\n", rc));
371	}
372	}
373	else
374	{
375	rc = rtTcpError();
376	}
377	}
378	else
379	{
380	rc = rtTcpError();
381	AssertMsgFailed(("setsockopt() %Vrc\n", rc));
382	}
383	rtTcpClose(WaitSock, "RTServerCreateEx");
384	}
385	else
386	{
387	rc = rtTcpError();
388	AssertMsgFailed(("socket() %Vrc\n", rc));
389	}
390
391	return rc;
392	}
393
394
395	/**
396	* Listen for incoming connections.
397	*
398	* The function will loop accepting connections and call pfnServe for
399	* each of the incoming connections in turn. The pfnServe function can
400	* return VERR_TCP_SERVER_STOP too terminate this loop. A stopped server
401	* can only be destroyed.
402	*
403	* @returns iprt status code.
404	* @param pServer The server handle as returned from RTTcpServerCreateEx().
405	* @param pfnServe The function which will serve a new client connection.
406	* @param pvUser User argument passed to pfnServe.
407	*/
408	RTR3DECL(int) RTTcpServerListen(PRTTCPSERVER pServer, PFNRTTCPSERVE pfnServe, void *pvUser)
409	{
410	/*
411	* Validate input.
412	*/
413	if (!pfnServe \|\| !pServer)
414	{
415	AssertMsgFailed(("pfnServer=%p pServer=%p\n", pfnServe, pServer));
416	return VERR_INVALID_PARAMETER;
417	}
418	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, RTTCPSERVERSTATE_CREATED))
419	{
420	Assert(!pServer->pfnServe);
421	Assert(!pServer->pvUser);
422	Assert(pServer->Thread == NIL_RTTHREAD);
423	Assert(pServer->SockClient == NIL_RTSOCKET);
424
425	pServer->pfnServe = pfnServe;
426	pServer->pvUser = pvUser;
427	pServer->Thread = RTThreadSelf();
428	Assert(pServer->Thread != NIL_RTTHREAD);
429	return rtTcpServerListen(pServer);
430	}
431	AssertMsgFailed(("pServer->enmState=%d\n", pServer->enmState));
432	return VERR_INVALID_PARAMETER;
433	}
434
435
436
437	/**
438	* Internal worker common for RTTcpServerListen and the thread created by RTTcpServerCreate().
439	*/
440	static int rtTcpServerListen(PRTTCPSERVER pServer)
441	{
442	/*
443	* Accept connection loop.
444	*/
445	int rc = VINF_SUCCESS;
446	for (;;)
447	{
448	/*
449	* Change state.
450	*/
451	RTTCPSERVERSTATE enmState = pServer->enmState;
452	if ( enmState != RTTCPSERVERSTATE_ACCEPTING
453	&& enmState != RTTCPSERVERSTATE_SERVING)
454	break;
455	if (!rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, enmState))
456	continue;
457
458	/*
459	* Accept connection.
460	*/
461	struct sockaddr_in RemoteAddr = {0};
462	socklen_t Len = sizeof(RemoteAddr);
463	RTSOCKET Socket = accept(pServer->SockServer, (struct sockaddr *)&RemoteAddr, &Len);
464	if (Socket == -1)
465	{
466	#ifndef __WIN__
467	/* These are typical for what can happen during destruction. */
468	if (errno == EBADF \|\| errno == EINVAL \|\| errno == ENOTSOCK)
469	break;
470	#endif
471	continue;
472	}
473
474	/*
475	* Run a pfnServe callback.
476	*/
477	if (!rtTcpServerSetState(pServer, RTTCPSERVERSTATE_SERVING, RTTCPSERVERSTATE_ACCEPTING))
478	break;
479	rtTcpAtomicXchgSock(&pServer->SockClient, Socket);
480	rc = pServer->pfnServe(Socket, pServer->pvUser);
481	rtTcpClose(rtTcpAtomicXchgSock(&pServer->SockClient, NIL_RTSOCKET), "Listener: client");
482
483	/*
484	* Stop the server?
485	*/
486	if (rc == VERR_TCP_SERVER_STOP)
487	{
488	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_STOPPING, RTTCPSERVERSTATE_SERVING))
489	{
490	/*
491	* Reset the server socket and change the state to stopped. After that state change
492	* we cannot safely access the handle so we'll have to return here.
493	*/
494	RTSOCKET SockServer = rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET);
495	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_STOPPED, RTTCPSERVERSTATE_STOPPING);
496	rtTcpClose(SockServer, "Listener: server stopped");
497	return rc;
498	}
499	break;
500	}
501	}
502
503	/*
504	* Perform any pending clean and be gone.
505	*/
506	rcTcpServerListenCleanup(pServer);
507	return rc;
508	}
509
510
511	/**
512	* Clean up after listener.
513	*/
514	static void rcTcpServerListenCleanup(PRTTCPSERVER pServer)
515	{
516	/*
517	* Wait for any destroyers to finish signaling us.
518	*/
519	for (unsigned cTries = 99; cTries > 0; cTries--)
520	{
521	RTTCPSERVERSTATE enmState = pServer->enmState;
522	switch (enmState)
523	{
524	/*
525	* Intermediate state while the destroyer closes the client socket.
526	*/
527	case RTTCPSERVERSTATE_SIGNALING:
528	if (!RTThreadYield())
529	RTThreadSleep(1);
530	break;
531
532	/*
533	* Free the handle.
534	*/
535	case RTTCPSERVERSTATE_DESTROYING:
536	{
537	rtTcpClose(rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET), "Listener-cleanup: server");
538	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_FREED, RTTCPSERVERSTATE_DESTROYING);
539	RTMemFree(pServer);
540	return;
541	}
542
543	/*
544	* Everything else means failure.
545	*/
546	default:
547	AssertMsgFailed(("pServer=%p enmState=%d\n", pServer, enmState));
548	return;
549	}
550	}
551	AssertMsgFailed(("Timed out when trying to clean up after listener. pServer=%p enmState=%d\n", pServer, pServer->enmState));
552	}
553
554
555	/**
556	* Closes down and frees a TCP Server.
557	* This will also terminate any open connections to the server.
558	*
559	* @returns iprt status code.
560	* @param pServer Handle to the server.
561	*/
562	RTR3DECL(int) RTTcpServerDestroy(PRTTCPSERVER pServer)
563	{
564	/*
565	* Validate input.
566	*/
567	if ( !pServer
568	\|\| pServer->enmState <= RTTCPSERVERSTATE_INVALID
569	\|\| pServer->enmState >= RTTCPSERVERSTATE_FREED)
570	{
571	AssertMsgFailed(("Invalid parameter!\n"));
572	return VERR_INVALID_PARAMETER;
573	}
574
575	/** @todo r=bird: Some of this horrible code can probably be exchanged with a RTThreadWait(). (It didn't exist when this code was written.) */
576
577	/*
578	* Move it to the destroying state.
579	*/
580	RTSOCKET SockServer = rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET);
581	for (unsigned cTries = 99; cTries > 0; cTries--)
582	{
583	RTTCPSERVERSTATE enmState = pServer->enmState;
584	switch (enmState)
585	{
586	/*
587	* Try move it to the destroying state.
588	*/
589	case RTTCPSERVERSTATE_STARTING:
590	case RTTCPSERVERSTATE_ACCEPTING:
591	case RTTCPSERVERSTATE_SERVING:
592	{
593	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_SIGNALING, enmState))
594	{
595	/* client */
596	RTSOCKET SockClient = rtTcpAtomicXchgSock(&pServer->SockClient, NIL_RTSOCKET);
597	if (SockClient != NIL_RTSOCKET)
598	{
599	shutdown(SockClient, SHUT_RDWR);
600	rtTcpClose(SockClient, "Destroyer: client");
601	}
602	bool fRc = rtTcpServerSetState(pServer, RTTCPSERVERSTATE_DESTROYING, RTTCPSERVERSTATE_SIGNALING);
603	Assert(fRc); NOREF(fRc);
604
605	/* server */
606	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server destroying");
607	RTThreadYield();
608
609	return VINF_SUCCESS;
610	}
611	break;
612	}
613
614
615	/*
616	* Intermediate state.
617	*/
618	case RTTCPSERVERSTATE_STOPPING:
619	if (!RTThreadYield())
620	RTThreadSleep(1);
621	break;
622
623	/*
624	* Just release the handle.
625	*/
626	case RTTCPSERVERSTATE_CREATED:
627	case RTTCPSERVERSTATE_STOPPED:
628	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_FREED, enmState))
629	{
630	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server freeing");
631	RTMemFree(pServer);
632	return VINF_TCP_SERVER_STOP;
633	}
634	break;
635
636	/*
637	* Everything else means failure.
638	*/
639	default:
640	AssertMsgFailed(("pServer=%p enmState=%d\n", pServer, enmState));
641	return VERR_INTERNAL_ERROR;
642	}
643	}
644
645	AssertMsgFailed(("Giving up! pServer=%p enmState=%d\n", pServer, pServer->enmState));
646	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server timeout");
647	return VERR_INTERNAL_ERROR;
648	}
649
650
651	/**
652	* Shutdowns the server socket.
653	*/
654	static void rtTcpServerDestroyServerSock(RTSOCKET SockServer, const char *pszMsg)
655	{
656	if (SockServer == NIL_RTSOCKET)
657	return;
658	shutdown(SockServer, SHUT_RDWR);
659	rtTcpClose(SockServer, "Destroyer: server destroying");
660	}
661
662
663
664	RTR3DECL(int) RTTcpRead(RTSOCKET Sock, void pvBuffer, size_t cbBuffer, size_t pcbRead)
665	{
666	/*
667	* Do params checking
668	*/
669	if (!pvBuffer \|\| !cbBuffer)
670	{
671	AssertMsgFailed(("Invalid params\n"));
672	return VERR_INVALID_PARAMETER;
673	}
674
675	/*
676	* Read loop.
677	* If pcbRead is NULL we have to fill the entire buffer!
678	*/
679	size_t cbRead = 0;
680	size_t cbToRead = cbBuffer;
681	for (;;)
682	{
683	ssize_t cbBytesRead = recv(Sock, (char *)pvBuffer + cbRead, cbToRead, MSG_NOSIGNAL);
684	if (cbBytesRead < 0)
685	return rtTcpError();
686	if (cbBytesRead == 0 && rtTcpError())
687	return rtTcpError();
688	if (pcbRead)
689	{
690	/* return partial data */
691	*pcbRead = cbBytesRead;
692	break;
693	}
694
695	/* read more? */
696	cbRead += cbBytesRead;
697	if (cbRead == cbBuffer)
698	break;
699
700	/* next */
701	cbToRead = cbBuffer - cbRead;
702	}
703
704	return VINF_SUCCESS;
705	}
706
707
708	RTR3DECL(int) RTTcpWrite(RTSOCKET Sock, const void *pvBuffer, size_t cbBuffer)
709	{
710	do
711	{
712	ssize_t cbWritten = send(Sock, (const char *)pvBuffer, cbBuffer, MSG_NOSIGNAL);
713	if (cbWritten < 0)
714	return rtTcpError();
715	AssertMsg(cbBuffer >= (size_t)cbWritten, ("Wrote more than we requested!!! cbWritten=%d cbBuffer=%d rtTcpError()=%d\n",
716	cbWritten, cbBuffer, rtTcpError()));
717	cbBuffer -= cbWritten;
718	pvBuffer = (char *)pvBuffer + cbWritten;
719	} while (cbBuffer);
720
721	return VINF_SUCCESS;
722	}
723
724
725	RTR3DECL(int) RTTcpFlush(RTSOCKET Sock)
726	{
727	int fFlag = 1;
728	setsockopt(Sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&fFlag, sizeof(fFlag));
729	fFlag = 0;
730	setsockopt(Sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&fFlag, sizeof(fFlag));
731
732	return VINF_SUCCESS;
733	}
734
735
736	RTR3DECL(int) RTTcpSelectOne(RTSOCKET Sock, unsigned cMillies)
737	{
738	fd_set fdsetR;
739	FD_ZERO(&fdsetR);
740	FD_SET(Sock, &fdsetR);
741
742	fd_set fdsetE = fdsetR;
743
744	int rc;
745	if (cMillies == RT_INDEFINITE_WAIT)
746	rc = select(FD_SETSIZE, &fdsetR, NULL, &fdsetE, NULL);
747	else
748	{
749	struct timeval timeout;
750	timeout.tv_sec = cMillies / 1000;
751	timeout.tv_usec = (cMillies % 1000) * 1000;
752	rc = select(FD_SETSIZE, &fdsetR, NULL, &fdsetE, &timeout);
753	}
754	if (rc > 0)
755	return VINF_SUCCESS;
756	if (rc == 0)
757	return VERR_TIMEOUT;
758	return rtTcpError();
759	}
760
761
762	RTR3DECL(int) RTTcpClientConnect(const char *pszAddress, uint32_t uPort, PRTSOCKET pSock)
763	{
764	int rc;
765
766	/*
767	* Do params checking
768	*/
769	AssertReturn(uPort, VERR_INVALID_PARAMETER);
770	AssertReturn(VALID_PTR(pszAddress), VERR_INVALID_PARAMETER);
771
772	#ifdef __WIN__
773	/*
774	* Initialize WinSock and check version.
775	*/
776	WORD wVersionRequested = MAKEWORD(1, 1);
777	WSADATA wsaData;
778	rc = WSAStartup(wVersionRequested, &wsaData);
779	if (wsaData.wVersion != wVersionRequested)
780	{
781	AssertMsgFailed(("Wrong winsock version\n"));
782	return VERR_NOT_SUPPORTED;
783	}
784	#endif
785
786	/*
787	* Resolve the address.
788	*/
789	struct hostent *pHostEnt = NULL;
790	pHostEnt = gethostbyname(pszAddress);
791	if (!pHostEnt)
792	{
793	struct in_addr InAddr;
794	InAddr.s_addr = inet_addr(pszAddress);
795	pHostEnt = gethostbyaddr((char *)&InAddr, 4, AF_INET);
796	if (!pHostEnt)
797	{
798	rc = rtTcpError();
799	AssertMsgFailed(("Could not resolve '%s', rc=%Vrc\n", pszAddress, rc));
800	return rc;
801	}
802	}
803
804	/*
805	* Create the socket and connect.
806	*/
807	RTSOCKET Sock = socket(AF_INET, SOCK_STREAM, 0);
808	if (Sock != -1)
809	{
810	struct sockaddr_in InAddr = {0};
811	InAddr.sin_family = AF_INET;
812	InAddr.sin_port = htons(uPort);
813	InAddr.sin_addr = ((struct in_addr )pHostEnt->h_addr);
814	if (!connect(Sock, (struct sockaddr *)&InAddr, sizeof(InAddr)))
815	{
816	*pSock = Sock;
817	return VINF_SUCCESS;
818	}
819	rc = rtTcpError();
820	rtTcpClose(Sock, "RTTcpClientConnect");
821	}
822	else
823	rc = rtTcpError();
824	return rc;
825	}
826
827
828	RTR3DECL(int) RTTcpClientClose(RTSOCKET Sock)
829	{
830	return rtTcpClose(Sock, "RTTcpClientClose");
831	}
832
833
834	/**
835	* Internal close function which does all the proper bitching.
836	*/
837	static int rtTcpClose(RTSOCKET Sock, const char *pszMsg)
838	{
839	/* ignore nil handles. */
840	if (Sock == NIL_RTSOCKET)
841	return VINF_SUCCESS;
842
843	/*
844	* Attempt to close it.
845	*/
846	#ifdef __WIN__
847	int rc = closesocket(Sock);
848	#else
849	int rc = close(Sock);
850	#endif
851	if (!rc)
852	return VINF_SUCCESS;
853	rc = rtTcpError();
854	AssertMsgFailed(("\"%s\": close(%d) -> %Vrc\n", pszMsg, Sock, rc));
855	return rc;
856	}
857

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source: vbox/trunk/src/VBox/Runtime/r3/tcp.cpp@ 331

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