tcp.cpp@ 23613

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tcp.cpp: nippicking: No else after return.
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1	/* $Id: tcp.cpp 23613 2009-10-08 10:10:06Z 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.215389.xyz. 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	*
147	* @returns iprt status code.
148	*/
149	DECLINLINE(int) rtTcpError(void)
150	{
151	#ifdef RT_OS_WINDOWS
152	return RTErrConvertFromWin32(WSAGetLastError());
153	#else
154	return RTErrConvertFromErrno(errno);
155	#endif
156	}
157
158
159	/**
160	* Resets the last error.
161	*/
162	DECLINLINE(void) rtTcpErrorReset(void)
163	{
164	#ifdef RT_OS_WINDOWS
165	WSASetLastError(0);
166	#else
167	errno = 0;
168	#endif
169	}
170
171
172	/**
173	* Get the last resolver error as an iprt status code.
174	*
175	* @returns iprt status code.
176	*/
177	DECLINLINE(int) rtTcpResolverError(void)
178	{
179	#ifdef RT_OS_WINDOWS
180	return RTErrConvertFromWin32(WSAGetLastError());
181	#else
182	switch (h_errno)
183	{
184	case HOST_NOT_FOUND:
185	return VERR_NET_HOST_NOT_FOUND;
186	case NO_DATA:
187	return VERR_NET_ADDRESS_NOT_AVAILABLE;
188	case NO_RECOVERY:
189	return VERR_IO_GEN_FAILURE;
190	case TRY_AGAIN:
191	return VERR_TRY_AGAIN;
192
193	default:
194	return VERR_UNRESOLVED_ERROR;
195	}
196	#endif
197	}
198
199
200	/**
201	* Atomicly updates a socket variable.
202	* @returns The old value.
203	* @param pSock The socket variable to update.
204	* @param Sock The new value.
205	*/
206	DECLINLINE(RTSOCKET) rtTcpAtomicXchgSock(RTSOCKET volatile *pSock, const RTSOCKET Sock)
207	{
208	switch (sizeof(RTSOCKET))
209	{
210	case 4: return (RTSOCKET)ASMAtomicXchgS32((int32_t volatile *)pSock, (int32_t)Sock);
211	default:
212	AssertReleaseFailed();
213	return NIL_RTSOCKET;
214	}
215	}
216
217
218	/**
219	* Changes the TCP server state.
220	*/
221	DECLINLINE(bool) rtTcpServerSetState(PRTTCPSERVER pServer, RTTCPSERVERSTATE enmStateNew, RTTCPSERVERSTATE enmStateOld)
222	{
223	bool fRc;
224	ASMAtomicCmpXchgSize(&pServer->enmState, enmStateNew, enmStateOld, fRc);
225	return fRc;
226	}
227
228
229	/**
230	* Create single connection at a time TCP Server in a separate thread.
231	*
232	* The thread will loop accepting connections and call pfnServe for
233	* each of the incoming connections in turn. The pfnServe function can
234	* return VERR_TCP_SERVER_STOP too terminate this loop. RTTcpServerDestroy()
235	* should be used to terminate the server.
236	*
237	* @returns iprt status code.
238	* @param pszAddress The address for creating a listening socket.
239	* If NULL or empty string the server is bound to all interfaces.
240	* @param uPort The port for creating a listening socket.
241	* @param enmType The thread type.
242	* @param pszThrdName The name of the worker thread.
243	* @param pfnServe The function which will serve a new client connection.
244	* @param pvUser User argument passed to pfnServe.
245	* @param ppServer Where to store the serverhandle.
246	*/
247	RTR3DECL(int) RTTcpServerCreate(const char pszAddress, unsigned uPort, RTTHREADTYPE enmType, const char pszThrdName,
248	PFNRTTCPSERVE pfnServe, void *pvUser, PPRTTCPSERVER ppServer)
249	{
250	/*
251	* Do params checking
252	*/
253	if (!uPort \|\| !pfnServe \|\| !pszThrdName \|\| !ppServer)
254	{
255	AssertMsgFailed(("Invalid params\n"));
256	return VERR_INVALID_PARAMETER;
257	}
258
259	/*
260	* Create the server.
261	*/
262	PRTTCPSERVER pServer;
263	int rc = RTTcpServerCreateEx(pszAddress, uPort, &pServer);
264	if (RT_SUCCESS(rc))
265	{
266	/*
267	* Create the listener thread.
268	*/
269	pServer->enmState = RTTCPSERVERSTATE_STARTING;
270	pServer->pvUser = pvUser;
271	pServer->pfnServe = pfnServe;
272	rc = RTThreadCreate(&pServer->Thread, rtTcpServerThread, pServer, 0, enmType, /RTTHREADFLAGS_WAITABLE/0, pszThrdName);
273	if (RT_SUCCESS(rc))
274	{
275	/* done */
276	if (ppServer)
277	*ppServer = pServer;
278	return rc;
279	}
280
281	/*
282	* Destroy the server.
283	*/
284	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_CREATED, RTTCPSERVERSTATE_STARTING);
285	RTTcpServerDestroy(pServer);
286	}
287
288	return rc;
289	}
290
291
292	/**
293	* Server thread, loops accepting connections until it's terminated.
294	*
295	* @returns iprt status code. (ignored).
296	* @param ThreadSelf Thread handle.
297	* @param pvServer Server handle.
298	*/
299	static DECLCALLBACK(int) rtTcpServerThread(RTTHREAD ThreadSelf, void *pvServer)
300	{
301	PRTTCPSERVER pServer = (PRTTCPSERVER)pvServer;
302	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, RTTCPSERVERSTATE_STARTING))
303	return rtTcpServerListen(pServer);
304	rcTcpServerListenCleanup(pServer);
305	NOREF(ThreadSelf);
306	return VINF_SUCCESS;
307	}
308
309
310	/**
311	* Create single connection at a time TCP Server.
312	* The caller must call RTTcpServerListen() to actually start the server.
313	*
314	* @returns iprt status code.
315	* @param pszAddress The address for creating a listening socket.
316	* If NULL the server is bound to all interfaces.
317	* @param uPort The port for creating a listening socket.
318	* @param ppServer Where to store the serverhandle.
319	*/
320	RTR3DECL(int) RTTcpServerCreateEx(const char *pszAddress, uint32_t uPort, PPRTTCPSERVER ppServer)
321	{
322	int rc;
323
324	/*
325	* Do params checking
326	*/
327	if (!uPort \|\| !ppServer)
328	{
329	AssertMsgFailed(("Invalid params\n"));
330	return VERR_INVALID_PARAMETER;
331	}
332
333	#ifdef RT_OS_WINDOWS
334	/*
335	* Initialize WinSock and check version.
336	*/
337	WORD wVersionRequested = MAKEWORD(1, 1);
338	WSADATA wsaData;
339	rc = WSAStartup(wVersionRequested, &wsaData);
340	if (wsaData.wVersion != wVersionRequested)
341	{
342	AssertMsgFailed(("Wrong winsock version\n"));
343	return VERR_NOT_SUPPORTED;
344	}
345	#endif
346
347	/*
348	* Get host listening address.
349	*/
350	struct hostent *pHostEnt = NULL;
351	if (pszAddress != NULL && *pszAddress)
352	{
353	pHostEnt = gethostbyname(pszAddress);
354	if (!pHostEnt)
355	{
356	struct in_addr InAddr;
357	InAddr.s_addr = inet_addr(pszAddress);
358	pHostEnt = gethostbyaddr((char *)&InAddr, 4, AF_INET);
359	if (!pHostEnt)
360	{
361	rc = rtTcpResolverError();
362	AssertMsgFailed(("Could not get host address rc=%Rrc\n", rc));
363	return rc;
364	}
365	}
366	}
367
368	/*
369	* Setting up socket.
370	*/
371	RTSOCKET WaitSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
372	if (WaitSock != -1)
373	{
374	/*
375	* Set socket options.
376	*/
377	int fFlag = 1;
378	if (!setsockopt(WaitSock, SOL_SOCKET, SO_REUSEADDR, (const char *)&fFlag, sizeof(fFlag)))
379	{
380	/*
381	* Set socket family, address and port.
382	*/
383	struct sockaddr_in LocalAddr = {0};
384	LocalAddr.sin_family = AF_INET;
385	LocalAddr.sin_port = htons(uPort);
386	/* if address not specified, use INADDR_ANY. */
387	if (!pHostEnt)
388	LocalAddr.sin_addr.s_addr = INADDR_ANY;
389	else
390	LocalAddr.sin_addr = ((struct in_addr )pHostEnt->h_addr);
391
392	/*
393	* Bind a name to a socket.
394	*/
395	if (bind(WaitSock, (struct sockaddr *)&LocalAddr, sizeof(LocalAddr)) != -1)
396	{
397	/*
398	* Listen for connections on a socket.
399	*/
400	if (listen(WaitSock, BACKLOG) != -1)
401	{
402	/*
403	* Create the server handle.
404	*/
405	PRTTCPSERVER pServer = (PRTTCPSERVER)RTMemAllocZ(sizeof(*pServer));
406	if (pServer)
407	{
408	pServer->SockServer = WaitSock;
409	pServer->SockClient = NIL_RTSOCKET;
410	pServer->Thread = NIL_RTTHREAD;
411	pServer->enmState = RTTCPSERVERSTATE_CREATED;
412	*ppServer = pServer;
413	return VINF_SUCCESS;
414	}
415
416	/* bail out */
417	rc = VERR_NO_MEMORY;
418	}
419	else
420	{
421	rc = rtTcpError();
422	AssertMsgFailed(("listen() %Rrc\n", rc));
423	}
424	}
425	else
426	{
427	rc = rtTcpError();
428	}
429	}
430	else
431	{
432	rc = rtTcpError();
433	AssertMsgFailed(("setsockopt() %Rrc\n", rc));
434	}
435	rtTcpClose(WaitSock, "RTServerCreateEx");
436	}
437	else
438	{
439	rc = rtTcpError();
440	AssertMsgFailed(("socket() %Rrc\n", rc));
441	}
442
443	return rc;
444	}
445
446
447	/**
448	* Listen for incoming connections.
449	*
450	* The function will loop accepting connections and call pfnServe for
451	* each of the incoming connections in turn. The pfnServe function can
452	* return VERR_TCP_SERVER_STOP too terminate this loop. A stopped server
453	* can only be destroyed.
454	*
455	* @returns iprt status code.
456	* @param pServer The server handle as returned from RTTcpServerCreateEx().
457	* @param pfnServe The function which will serve a new client connection.
458	* @param pvUser User argument passed to pfnServe.
459	*/
460	RTR3DECL(int) RTTcpServerListen(PRTTCPSERVER pServer, PFNRTTCPSERVE pfnServe, void *pvUser)
461	{
462	/*
463	* Validate input.
464	*/
465	if (!pfnServe \|\| !pServer)
466	{
467	AssertMsgFailed(("pfnServer=%p pServer=%p\n", pfnServe, pServer));
468	return VERR_INVALID_PARAMETER;
469	}
470	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, RTTCPSERVERSTATE_CREATED))
471	{
472	Assert(!pServer->pfnServe);
473	Assert(!pServer->pvUser);
474	Assert(pServer->Thread == NIL_RTTHREAD);
475	Assert(pServer->SockClient == NIL_RTSOCKET);
476
477	pServer->pfnServe = pfnServe;
478	pServer->pvUser = pvUser;
479	pServer->Thread = RTThreadSelf();
480	Assert(pServer->Thread != NIL_RTTHREAD);
481	return rtTcpServerListen(pServer);
482	}
483	AssertMsgFailed(("pServer->enmState=%d\n", pServer->enmState));
484	return VERR_INVALID_PARAMETER;
485	}
486
487
488	/**
489	* Closes the client socket.
490	*/
491	static int rtTcpServerDestroyClientSock(RTSOCKET volatile pSock, const char pszMsg)
492	{
493	RTSOCKET Sock = rtTcpAtomicXchgSock(pSock, NIL_RTSOCKET);
494	if (Sock != NIL_RTSOCKET)
495	shutdown(Sock, SHUT_RDWR);
496	return rtTcpClose(Sock, pszMsg);
497	}
498
499
500	/**
501	* Internal worker common for RTTcpServerListen and the thread created by RTTcpServerCreate().
502	*/
503	static int rtTcpServerListen(PRTTCPSERVER pServer)
504	{
505	/*
506	* Accept connection loop.
507	*/
508	int rc = VINF_SUCCESS;
509	for (;;)
510	{
511	/*
512	* Change state.
513	*/
514	RTTCPSERVERSTATE enmState = pServer->enmState;
515	if ( enmState != RTTCPSERVERSTATE_ACCEPTING
516	&& enmState != RTTCPSERVERSTATE_SERVING)
517	break;
518	if (!rtTcpServerSetState(pServer, RTTCPSERVERSTATE_ACCEPTING, enmState))
519	continue;
520
521	/*
522	* Accept connection.
523	*/
524	struct sockaddr_in RemoteAddr = {0};
525	socklen_t Len = sizeof(RemoteAddr);
526	RTSOCKET Socket = accept(pServer->SockServer, (struct sockaddr *)&RemoteAddr, &Len);
527	if (Socket == -1)
528	{
529	#ifndef RT_OS_WINDOWS
530	/* These are typical for what can happen during destruction. */
531	if (errno == EBADF \|\| errno == EINVAL \|\| errno == ENOTSOCK)
532	break;
533	#endif
534	continue;
535	}
536
537	/*
538	* Run a pfnServe callback.
539	*/
540	if (!rtTcpServerSetState(pServer, RTTCPSERVERSTATE_SERVING, RTTCPSERVERSTATE_ACCEPTING))
541	break;
542	rtTcpAtomicXchgSock(&pServer->SockClient, Socket);
543	rc = pServer->pfnServe(Socket, pServer->pvUser);
544	rtTcpServerDestroyClientSock(&pServer->SockClient, "Listener: client");
545
546	/*
547	* Stop the server?
548	*/
549	if (rc == VERR_TCP_SERVER_STOP)
550	{
551	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_STOPPING, RTTCPSERVERSTATE_SERVING))
552	{
553	/*
554	* Reset the server socket and change the state to stopped. After that state change
555	* we cannot safely access the handle so we'll have to return here.
556	*/
557	RTSOCKET SockServer = rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET);
558	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_STOPPED, RTTCPSERVERSTATE_STOPPING);
559	rtTcpClose(SockServer, "Listener: server stopped");
560	return rc;
561	}
562	break;
563	}
564	}
565
566	/*
567	* Perform any pending clean and be gone.
568	*/
569	rcTcpServerListenCleanup(pServer);
570	return rc;
571	}
572
573
574	/**
575	* Clean up after listener.
576	*/
577	static void rcTcpServerListenCleanup(PRTTCPSERVER pServer)
578	{
579	/*
580	* Wait for any destroyers to finish signaling us.
581	*/
582	for (unsigned cTries = 99; cTries > 0; cTries--)
583	{
584	RTTCPSERVERSTATE enmState = pServer->enmState;
585	switch (enmState)
586	{
587	/*
588	* Intermediate state while the destroyer closes the client socket.
589	*/
590	case RTTCPSERVERSTATE_SIGNALING:
591	if (!RTThreadYield())
592	RTThreadSleep(1);
593	break;
594
595	/*
596	* Free the handle.
597	*/
598	case RTTCPSERVERSTATE_DESTROYING:
599	{
600	rtTcpClose(rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET), "Listener-cleanup: server");
601	rtTcpServerSetState(pServer, RTTCPSERVERSTATE_FREED, RTTCPSERVERSTATE_DESTROYING);
602	RTMemFree(pServer);
603	return;
604	}
605
606	/*
607	* Everything else means failure.
608	*/
609	default:
610	AssertMsgFailed(("pServer=%p enmState=%d\n", pServer, enmState));
611	return;
612	}
613	}
614	AssertMsgFailed(("Timed out when trying to clean up after listener. pServer=%p enmState=%d\n", pServer, pServer->enmState));
615	}
616
617
618	/**
619	* Terminate the open connection to the server.
620	*
621	* @returns iprt status code.
622	* @param pServer Handle to the server.
623	*/
624	RTR3DECL(int) RTTcpServerDisconnectClient(PRTTCPSERVER pServer)
625	{
626	/*
627	* Validate input.
628	*/
629	if ( !pServer
630	\|\| pServer->enmState <= RTTCPSERVERSTATE_INVALID
631	\|\| pServer->enmState >= RTTCPSERVERSTATE_FREED)
632	{
633	AssertMsgFailed(("Invalid parameter!\n"));
634	return VERR_INVALID_PARAMETER;
635	}
636
637	return rtTcpServerDestroyClientSock(&pServer->SockClient, "DisconnectClient: client");
638	}
639
640
641	/**
642	* Closes down and frees a TCP Server.
643	* This will also terminate any open connections to the server.
644	*
645	* @returns iprt status code.
646	* @param pServer Handle to the server.
647	*/
648	RTR3DECL(int) RTTcpServerDestroy(PRTTCPSERVER pServer)
649	{
650	/*
651	* Validate input.
652	*/
653	if ( !pServer
654	\|\| pServer->enmState <= RTTCPSERVERSTATE_INVALID
655	\|\| pServer->enmState >= RTTCPSERVERSTATE_FREED)
656	{
657	AssertMsgFailed(("Invalid parameter!\n"));
658	return VERR_INVALID_PARAMETER;
659	}
660
661	/** @todo r=bird: Some of this horrible code can probably be exchanged with a RTThreadWait(). (It didn't exist when this code was written.) */
662
663	/*
664	* Move it to the destroying state.
665	*/
666	RTSOCKET SockServer = rtTcpAtomicXchgSock(&pServer->SockServer, NIL_RTSOCKET);
667	for (unsigned cTries = 99; cTries > 0; cTries--)
668	{
669	RTTCPSERVERSTATE enmState = pServer->enmState;
670	switch (enmState)
671	{
672	/*
673	* Try move it to the destroying state.
674	*/
675	case RTTCPSERVERSTATE_STARTING:
676	case RTTCPSERVERSTATE_ACCEPTING:
677	case RTTCPSERVERSTATE_SERVING:
678	{
679	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_SIGNALING, enmState))
680	{
681	/* client */
682	rtTcpServerDestroyClientSock(&pServer->SockClient, "Destroyer: client");
683
684	bool fRc = rtTcpServerSetState(pServer, RTTCPSERVERSTATE_DESTROYING, RTTCPSERVERSTATE_SIGNALING);
685	Assert(fRc); NOREF(fRc);
686
687	/* server */
688	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server destroying");
689	RTThreadYield();
690
691	return VINF_SUCCESS;
692	}
693	break;
694	}
695
696
697	/*
698	* Intermediate state.
699	*/
700	case RTTCPSERVERSTATE_STOPPING:
701	if (!RTThreadYield())
702	RTThreadSleep(1);
703	break;
704
705	/*
706	* Just release the handle.
707	*/
708	case RTTCPSERVERSTATE_CREATED:
709	case RTTCPSERVERSTATE_STOPPED:
710	if (rtTcpServerSetState(pServer, RTTCPSERVERSTATE_FREED, enmState))
711	{
712	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server freeing");
713	RTMemFree(pServer);
714	return VINF_TCP_SERVER_STOP;
715	}
716	break;
717
718	/*
719	* Everything else means failure.
720	*/
721	default:
722	AssertMsgFailed(("pServer=%p enmState=%d\n", pServer, enmState));
723	return VERR_INTERNAL_ERROR;
724	}
725	}
726
727	AssertMsgFailed(("Giving up! pServer=%p enmState=%d\n", pServer, pServer->enmState));
728	rtTcpServerDestroyServerSock(SockServer, "Destroyer: server timeout");
729	return VERR_INTERNAL_ERROR;
730	}
731
732
733	/**
734	* Shutdowns the server socket.
735	*/
736	static void rtTcpServerDestroyServerSock(RTSOCKET SockServer, const char *pszMsg)
737	{
738	if (SockServer == NIL_RTSOCKET)
739	return;
740	shutdown(SockServer, SHUT_RDWR);
741	rtTcpClose(SockServer, "Destroyer: server destroying");
742	}
743
744
745
746	RTR3DECL(int) RTTcpRead(RTSOCKET Sock, void pvBuffer, size_t cbBuffer, size_t pcbRead)
747	{
748	/*
749	* Do params checking
750	*/
751	if (!pvBuffer \|\| !cbBuffer)
752	{
753	AssertMsgFailed(("Invalid params\n"));
754	return VERR_INVALID_PARAMETER;
755	}
756
757	/*
758	* Read loop.
759	* If pcbRead is NULL we have to fill the entire buffer!
760	*/
761	size_t cbRead = 0;
762	size_t cbToRead = cbBuffer;
763	for (;;)
764	{
765	rtTcpErrorReset();
766	ssize_t cbBytesRead = recv(Sock, (char *)pvBuffer + cbRead, cbToRead, MSG_NOSIGNAL);
767	if (cbBytesRead < 0)
768	return rtTcpError();
769	if (cbBytesRead == 0 && rtTcpError())
770	return rtTcpError();
771	if (pcbRead)
772	{
773	/* return partial data */
774	*pcbRead = cbBytesRead;
775	break;
776	}
777
778	/* read more? */
779	cbRead += cbBytesRead;
780	if (cbRead == cbBuffer)
781	break;
782
783	/* next */
784	cbToRead = cbBuffer - cbRead;
785	}
786
787	return VINF_SUCCESS;
788	}
789
790
791	RTR3DECL(int) RTTcpWrite(RTSOCKET Sock, const void *pvBuffer, size_t cbBuffer)
792	{
793	do
794	{
795	ssize_t cbWritten = send(Sock, (const char *)pvBuffer, cbBuffer, MSG_NOSIGNAL);
796	if (cbWritten < 0)
797	return rtTcpError();
798	AssertMsg(cbBuffer >= (size_t)cbWritten, ("Wrote more than we requested!!! cbWritten=%d cbBuffer=%d rtTcpError()=%d\n",
799	cbWritten, cbBuffer, rtTcpError()));
800	cbBuffer -= cbWritten;
801	pvBuffer = (char *)pvBuffer + cbWritten;
802	} while (cbBuffer);
803
804	return VINF_SUCCESS;
805	}
806
807
808	RTR3DECL(int) RTTcpFlush(RTSOCKET Sock)
809	{
810	int fFlag = 1;
811	setsockopt(Sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&fFlag, sizeof(fFlag));
812	fFlag = 0;
813	setsockopt(Sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&fFlag, sizeof(fFlag));
814
815	return VINF_SUCCESS;
816	}
817
818
819	RTR3DECL(int) RTTcpSelectOne(RTSOCKET Sock, unsigned cMillies)
820	{
821	fd_set fdsetR;
822	FD_ZERO(&fdsetR);
823	FD_SET(Sock, &fdsetR);
824
825	fd_set fdsetE = fdsetR;
826
827	int rc;
828	if (cMillies == RT_INDEFINITE_WAIT)
829	rc = select(Sock + 1, &fdsetR, NULL, &fdsetE, NULL);
830	else
831	{
832	struct timeval timeout;
833	timeout.tv_sec = cMillies / 1000;
834	timeout.tv_usec = (cMillies % 1000) * 1000;
835	rc = select(Sock + 1, &fdsetR, NULL, &fdsetE, &timeout);
836	}
837	if (rc > 0)
838	return VINF_SUCCESS;
839	if (rc == 0)
840	return VERR_TIMEOUT;
841	return rtTcpError();
842	}
843
844
845	RTR3DECL(int) RTTcpClientConnect(const char *pszAddress, uint32_t uPort, PRTSOCKET pSock)
846	{
847	int rc;
848
849	/*
850	* Do params checking
851	*/
852	AssertReturn(uPort, VERR_INVALID_PARAMETER);
853	AssertReturn(VALID_PTR(pszAddress), VERR_INVALID_PARAMETER);
854
855	#ifdef RT_OS_WINDOWS
856	/*
857	* Initialize WinSock and check version.
858	*/
859	WORD wVersionRequested = MAKEWORD(1, 1);
860	WSADATA wsaData;
861	rc = WSAStartup(wVersionRequested, &wsaData);
862	if (wsaData.wVersion != wVersionRequested)
863	{
864	AssertMsgFailed(("Wrong winsock version\n"));
865	return VERR_NOT_SUPPORTED;
866	}
867	#endif
868
869	/*
870	* Resolve the address.
871	*/
872	struct hostent *pHostEnt = NULL;
873	pHostEnt = gethostbyname(pszAddress);
874	if (!pHostEnt)
875	{
876	struct in_addr InAddr;
877	InAddr.s_addr = inet_addr(pszAddress);
878	pHostEnt = gethostbyaddr((char *)&InAddr, 4, AF_INET);
879	if (!pHostEnt)
880	{
881	rc = rtTcpError();
882	AssertMsgFailed(("Could not resolve '%s', rc=%Rrc\n", pszAddress, rc));
883	return rc;
884	}
885	}
886
887	/*
888	* Create the socket and connect.
889	*/
890	RTSOCKET Sock = socket(PF_INET, SOCK_STREAM, 0);
891	if (Sock != -1)
892	{
893	struct sockaddr_in InAddr = {0};
894	InAddr.sin_family = AF_INET;
895	InAddr.sin_port = htons(uPort);
896	InAddr.sin_addr = ((struct in_addr )pHostEnt->h_addr);
897	if (!connect(Sock, (struct sockaddr *)&InAddr, sizeof(InAddr)))
898	{
899	*pSock = Sock;
900	return VINF_SUCCESS;
901	}
902	rc = rtTcpError();
903	rtTcpClose(Sock, "RTTcpClientConnect");
904	}
905	else
906	rc = rtTcpError();
907	return rc;
908	}
909
910
911	RTR3DECL(int) RTTcpClientClose(RTSOCKET Sock)
912	{
913	return rtTcpClose(Sock, "RTTcpClientClose");
914	}
915
916
917	/**
918	* Internal close function which does all the proper bitching.
919	*/
920	static int rtTcpClose(RTSOCKET Sock, const char *pszMsg)
921	{
922	/* ignore nil handles. */
923	if (Sock == NIL_RTSOCKET)
924	return VINF_SUCCESS;
925
926	/*
927	* Attempt to close it.
928	*/
929	#ifdef RT_OS_WINDOWS
930	int rc = closesocket(Sock);
931	#else
932	int rc = close(Sock);
933	#endif
934	if (!rc)
935	return VINF_SUCCESS;
936	rc = rtTcpError();
937	AssertMsgFailed(("\"%s\": close(%d) -> %Rrc\n", pszMsg, Sock, rc));
938	return rc;
939	}
940

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source: vbox/trunk/src/VBox/Runtime/r3/tcp.cpp@ 23613

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