udp.cpp@ 99196

Last change on this file since 99196 was 98103, checked in by vboxsync, 23 months ago
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1	/* $Id: udp.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* IPRT - UDP/IP.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#ifdef RT_OS_WINDOWS
42	# include <iprt/win/winsock2.h>
43	#else
44	# include <sys/types.h>
45	# include <sys/socket.h>
46	# include <errno.h>
47	# include <netinet/in.h>
48	# include <netinet/udp.h>
49	# include <arpa/inet.h>
50	# include <netdb.h>
51	#endif
52	#include <limits.h>
53
54	#include "internal/iprt.h"
55	#include <iprt/udp.h>
56
57	#include <iprt/asm.h>
58	#include <iprt/assert.h>
59	#include <iprt/err.h>
60	#include <iprt/mempool.h>
61	#include <iprt/mem.h>
62	#include <iprt/string.h>
63	#include <iprt/socket.h>
64	#include <iprt/thread.h>
65	#include <iprt/time.h>
66
67	#include "internal/magics.h"
68	#include "internal/socket.h"
69
70
71	/*********************************************************************************************************************************
72	* Defined Constants And Macros *
73	*********************************************************************************************************************************/
74	/* fixup backlevel OSes. */
75	#if defined(RT_OS_OS2) \|\| defined(RT_OS_WINDOWS)
76	# define socklen_t int
77	#endif
78
79
80	/*********************************************************************************************************************************
81	* Structures and Typedefs *
82	*********************************************************************************************************************************/
83	/**
84	* UDP Server state.
85	*/
86	typedef enum RTUDPSERVERSTATE
87	{
88	/** Invalid. */
89	RTUDPSERVERSTATE_INVALID = 0,
90	/** Created. */
91	RTUDPSERVERSTATE_CREATED,
92	/** Thread for incoming datagrams is starting up. */
93	RTUDPSERVERSTATE_STARTING,
94	/** Waiting for incoming datagrams. */
95	RTUDPSERVERSTATE_WAITING,
96	/** Handling an incoming datagram. */
97	RTUDPSERVERSTATE_RECEIVING,
98	/** Thread terminating. */
99	RTUDPSERVERSTATE_STOPPING,
100	/** Thread terminated. */
101	RTUDPSERVERSTATE_STOPPED,
102	/** Final cleanup before being unusable. */
103	RTUDPSERVERSTATE_DESTROYING
104	} RTUDPSERVERSTATE;
105
106	/*
107	* Internal representation of the UDP Server handle.
108	*/
109	typedef struct RTUDPSERVER
110	{
111	/** The magic value (RTUDPSERVER_MAGIC). */
112	uint32_t volatile u32Magic;
113	/** The server state. */
114	RTUDPSERVERSTATE volatile enmState;
115	/** The server thread. */
116	RTTHREAD Thread;
117	/** The server socket. */
118	RTSOCKET volatile hSocket;
119	/** The datagram receiver function. */
120	PFNRTUDPSERVE pfnServe;
121	/** Argument to pfnServer. */
122	void *pvUser;
123	} RTUDPSERVER;
124
125
126	/*********************************************************************************************************************************
127	* Internal Functions *
128	*********************************************************************************************************************************/
129	static DECLCALLBACK(int) rtUdpServerThread(RTTHREAD ThreadSelf, void *pvServer);
130	static int rtUdpServerListen(PRTUDPSERVER pServer);
131	static int rtUdpServerListenCleanup(PRTUDPSERVER pServer);
132	static int rtUdpServerDestroySocket(RTSOCKET volatile pSock, const char pszMsg);
133	static int rtUdpClose(RTSOCKET Sock, const char *pszMsg);
134
135
136	/**
137	* Atomicly updates a socket variable.
138	* @returns The old handle value.
139	* @param phSock The socket handle variable to update.
140	* @param hNew The new socket handle value.
141	*/
142	DECLINLINE(RTSOCKET) rtUdpAtomicXchgSock(RTSOCKET volatile *phSock, const RTSOCKET hNew)
143	{
144	RTSOCKET hRet;
145	ASMAtomicXchgHandle(phSock, hNew, &hRet);
146	return hRet;
147	}
148
149
150	/**
151	* Tries to change the UDP server state.
152	*/
153	DECLINLINE(bool) rtUdpServerTrySetState(PRTUDPSERVER pServer, RTUDPSERVERSTATE enmStateNew, RTUDPSERVERSTATE enmStateOld)
154	{
155	bool fRc;
156	ASMAtomicCmpXchgSize(&pServer->enmState, enmStateNew, enmStateOld, fRc);
157	return fRc;
158	}
159
160	/**
161	* Changes the UDP server state.
162	*/
163	DECLINLINE(void) rtUdpServerSetState(PRTUDPSERVER pServer, RTUDPSERVERSTATE enmStateNew, RTUDPSERVERSTATE enmStateOld)
164	{
165	bool fRc;
166	ASMAtomicCmpXchgSize(&pServer->enmState, enmStateNew, enmStateOld, fRc);
167	Assert(fRc); NOREF(fRc);
168	}
169
170
171	/**
172	* Closes a socket.
173	*
174	* @returns IPRT status code.
175	*/
176	static int rtUdpServerDestroySocket(RTSOCKET volatile pSock, const char pszMsg)
177	{
178	RTSOCKET hSocket = rtUdpAtomicXchgSock(pSock, NIL_RTSOCKET);
179	if (hSocket != NIL_RTSOCKET)
180	{
181	return rtUdpClose(hSocket, pszMsg);
182	}
183	return VINF_UDP_SERVER_NO_CLIENT;
184	}
185
186
187	/**
188	* Create single datagram at a time UDP Server in a separate thread.
189	*
190	* The thread will loop waiting for datagrams and call pfnServe for
191	* each of the incoming datagrams in turn. The pfnServe function can
192	* return VERR_UDP_SERVER_STOP too terminate this loop. RTUdpServerDestroy()
193	* should be used to terminate the server.
194	*
195	* @returns iprt status code.
196	* @param pszAddress The address for creating a datagram socket.
197	* If NULL or empty string the server is bound to all interfaces.
198	* @param uPort The port for creating a datagram socket.
199	* @param enmType The thread type.
200	* @param pszThrdName The name of the worker thread.
201	* @param pfnServe The function which will handle incoming datagrams.
202	* @param pvUser User argument passed to pfnServe.
203	* @param ppServer Where to store the serverhandle.
204	*/
205	RTR3DECL(int) RTUdpServerCreate(const char pszAddress, unsigned uPort, RTTHREADTYPE enmType, const char pszThrdName,
206	PFNRTUDPSERVE pfnServe, void *pvUser, PPRTUDPSERVER ppServer)
207	{
208	/*
209	* Validate input.
210	*/
211	AssertReturn(uPort > 0, VERR_INVALID_PARAMETER);
212	AssertPtrReturn(pfnServe, VERR_INVALID_POINTER);
213	AssertPtrReturn(pszThrdName, VERR_INVALID_POINTER);
214	AssertPtrReturn(ppServer, VERR_INVALID_POINTER);
215
216	/*
217	* Create the server.
218	*/
219	PRTUDPSERVER pServer;
220	int rc = RTUdpServerCreateEx(pszAddress, uPort, &pServer);
221	if (RT_SUCCESS(rc))
222	{
223	/*
224	* Create the listener thread.
225	*/
226	RTMemPoolRetain(pServer);
227	pServer->enmState = RTUDPSERVERSTATE_STARTING;
228	pServer->pvUser = pvUser;
229	pServer->pfnServe = pfnServe;
230	rc = RTThreadCreate(&pServer->Thread, rtUdpServerThread, pServer, 0, enmType, /RTTHREADFLAGS_WAITABLE/0, pszThrdName);
231	if (RT_SUCCESS(rc))
232	{
233	/* done */
234	if (ppServer)
235	*ppServer = pServer;
236	else
237	RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
238	return rc;
239	}
240	RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
241
242	/*
243	* Destroy the server.
244	*/
245	rtUdpServerSetState(pServer, RTUDPSERVERSTATE_CREATED, RTUDPSERVERSTATE_STARTING);
246	RTUdpServerDestroy(pServer);
247	}
248
249	return rc;
250	}
251
252
253	/**
254	* Server thread, loops waiting for datagrams until it's terminated.
255	*
256	* @returns iprt status code. (ignored).
257	* @param ThreadSelf Thread handle.
258	* @param pvServer Server handle.
259	*/
260	static DECLCALLBACK(int) rtUdpServerThread(RTTHREAD ThreadSelf, void *pvServer)
261	{
262	PRTUDPSERVER pServer = (PRTUDPSERVER)pvServer;
263	int rc;
264	if (rtUdpServerTrySetState(pServer, RTUDPSERVERSTATE_WAITING, RTUDPSERVERSTATE_STARTING))
265	rc = rtUdpServerListen(pServer);
266	else
267	rc = rtUdpServerListenCleanup(pServer);
268	RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
269	NOREF(ThreadSelf);
270	return VINF_SUCCESS;
271	}
272
273
274	/**
275	* Create single datagram at a time UDP Server.
276	* The caller must call RTUdpServerReceive() to actually start the server.
277	*
278	* @returns iprt status code.
279	* @param pszAddress The address for creating a datagram socket.
280	* If NULL the server is bound to all interfaces.
281	* @param uPort The port for creating a datagram socket.
282	* @param ppServer Where to store the serverhandle.
283	*/
284	RTR3DECL(int) RTUdpServerCreateEx(const char *pszAddress, uint32_t uPort, PPRTUDPSERVER ppServer)
285	{
286
287	/*
288	* Validate input.
289	*/
290	AssertReturn(uPort > 0, VERR_INVALID_PARAMETER);
291	AssertPtrReturn(ppServer, VERR_INVALID_PARAMETER);
292
293	/*
294	* Resolve the address.
295	*/
296	RTNETADDR LocalAddr;
297	int rc = RTSocketParseInetAddress(pszAddress, uPort, &LocalAddr);
298	if (RT_FAILURE(rc))
299	return rc;
300
301	/*
302	* Setting up socket.
303	*/
304	RTSOCKET Sock;
305	rc = rtSocketCreate(&Sock, AF_INET, SOCK_DGRAM, IPPROTO_UDP, false /fInheritable/);
306	if (RT_SUCCESS(rc))
307	{
308	/*
309	* Set socket options.
310	*/
311	int fFlag = 1;
312	if (!rtSocketSetOpt(Sock, SOL_SOCKET, SO_REUSEADDR, &fFlag, sizeof(fFlag)))
313	{
314	/*
315	* Bind a name to the socket.
316	*/
317	rc = rtSocketBind(Sock, &LocalAddr);
318	if (RT_SUCCESS(rc))
319	{
320	/*
321	* Create the server handle.
322	*/
323	PRTUDPSERVER pServer = (PRTUDPSERVER)RTMemPoolAlloc(RTMEMPOOL_DEFAULT, sizeof(*pServer));
324	if (pServer)
325	{
326	pServer->u32Magic = RTUDPSERVER_MAGIC;
327	pServer->enmState = RTUDPSERVERSTATE_CREATED;
328	pServer->Thread = NIL_RTTHREAD;
329	pServer->hSocket = Sock;
330	pServer->pfnServe = NULL;
331	pServer->pvUser = NULL;
332	*ppServer = pServer;
333	return VINF_SUCCESS;
334	}
335
336	/* bail out */
337	rc = VERR_NO_MEMORY;
338	}
339	}
340	else
341	AssertMsgFailed(("rtSocketSetOpt: %Rrc\n", rc));
342	rtUdpClose(Sock, "RTServerCreateEx");
343	}
344
345	return rc;
346	}
347
348
349	/**
350	* Listen for incoming datagrams.
351	*
352	* The function will loop waiting for datagrams and call pfnServe for
353	* each of the incoming datagrams in turn. The pfnServe function can
354	* return VERR_UDP_SERVER_STOP too terminate this loop. A stopped server
355	* can only be destroyed.
356	*
357	* @returns IPRT status code.
358	* @retval VERR_UDP_SERVER_STOP if stopped by pfnServe.
359	* @retval VERR_UDP_SERVER_SHUTDOWN if shut down by RTUdpServerShutdown.
360	*
361	* @param pServer The server handle as returned from RTUdpServerCreateEx().
362	* @param pfnServe The function which will handle incoming datagrams.
363	* @param pvUser User argument passed to pfnServe.
364	*/
365	RTR3DECL(int) RTUdpServerListen(PRTUDPSERVER pServer, PFNRTUDPSERVE pfnServe, void *pvUser)
366	{
367	/*
368	* Validate input and retain the instance.
369	*/
370	AssertPtrReturn(pfnServe, VERR_INVALID_POINTER);
371	AssertPtrReturn(pServer, VERR_INVALID_HANDLE);
372	AssertReturn(pServer->u32Magic == RTUDPSERVER_MAGIC, VERR_INVALID_HANDLE);
373	AssertReturn(RTMemPoolRetain(pServer) != UINT32_MAX, VERR_INVALID_HANDLE);
374
375	int rc = VERR_INVALID_STATE;
376	if (rtUdpServerTrySetState(pServer, RTUDPSERVERSTATE_WAITING, RTUDPSERVERSTATE_CREATED))
377	{
378	Assert(!pServer->pfnServe);
379	Assert(!pServer->pvUser);
380	Assert(pServer->Thread == NIL_RTTHREAD);
381
382	pServer->pfnServe = pfnServe;
383	pServer->pvUser = pvUser;
384	pServer->Thread = RTThreadSelf();
385	Assert(pServer->Thread != NIL_RTTHREAD);
386	rc = rtUdpServerListen(pServer);
387	}
388	else
389	{
390	AssertMsgFailed(("enmState=%d\n", pServer->enmState));
391	rc = VERR_INVALID_STATE;
392	}
393	RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
394	return rc;
395	}
396
397
398	/**
399	* Internal worker common for RTUdpServerListen and the thread created by
400	* RTUdpServerCreate().
401	*
402	* The caller makes sure it has its own memory reference and releases it upon
403	* return.
404	*/
405	static int rtUdpServerListen(PRTUDPSERVER pServer)
406	{
407	/*
408	* Wait for incoming datagrams loop.
409	*/
410	for (;;)
411	{
412	/*
413	* Change state, getting an extra reference to the socket so we can
414	* allow others to close it while we're stuck in rtSocketAccept.
415	*/
416	RTUDPSERVERSTATE enmState = pServer->enmState;
417	RTSOCKET hSocket;
418	ASMAtomicReadHandle(&pServer->hSocket, &hSocket);
419	if (hSocket != NIL_RTSOCKET)
420	RTSocketRetain(hSocket);
421	if ( enmState != RTUDPSERVERSTATE_WAITING
422	&& enmState != RTUDPSERVERSTATE_RECEIVING)
423	{
424	RTSocketRelease(hSocket);
425	return rtUdpServerListenCleanup(pServer);
426	}
427	if (!rtUdpServerTrySetState(pServer, RTUDPSERVERSTATE_WAITING, enmState))
428	{
429	RTSocketRelease(hSocket);
430	continue;
431	}
432
433	/*
434	* Wait for incoming datagrams or errors.
435	*/
436	uint32_t fEvents;
437	int rc = RTSocketSelectOneEx(hSocket, RTSOCKET_EVT_READ \| RTSOCKET_EVT_ERROR, &fEvents, 1000);
438	RTSocketRelease(hSocket);
439	if (rc == VERR_TIMEOUT)
440	continue;
441	if (RT_FAILURE(rc))
442	{
443	/* These are typical for what can happen during destruction. */
444	if ( rc == VERR_INVALID_HANDLE
445	\|\| rc == VERR_INVALID_PARAMETER
446	\|\| rc == VERR_NET_NOT_SOCKET)
447	return rtUdpServerListenCleanup(pServer);
448	continue;
449	}
450	if (fEvents & RTSOCKET_EVT_ERROR)
451	return rtUdpServerListenCleanup(pServer);
452
453	/*
454	* Run a pfnServe callback.
455	*/
456	if (!rtUdpServerTrySetState(pServer, RTUDPSERVERSTATE_RECEIVING, RTUDPSERVERSTATE_WAITING))
457	return rtUdpServerListenCleanup(pServer);
458	rc = pServer->pfnServe(hSocket, pServer->pvUser);
459
460	/*
461	* Stop the server?
462	*/
463	if (rc == VERR_UDP_SERVER_STOP)
464	{
465	if (rtUdpServerTrySetState(pServer, RTUDPSERVERSTATE_STOPPING, RTUDPSERVERSTATE_RECEIVING))
466	{
467	/*
468	* Reset the server socket and change the state to stopped. After that state change
469	* we cannot safely access the handle so we'll have to return here.
470	*/
471	hSocket = rtUdpAtomicXchgSock(&pServer->hSocket, NIL_RTSOCKET);
472	rtUdpServerSetState(pServer, RTUDPSERVERSTATE_STOPPED, RTUDPSERVERSTATE_STOPPING);
473	rtUdpClose(hSocket, "Listener: server stopped");
474	}
475	else
476	rtUdpServerListenCleanup(pServer); /* ignore rc */
477	return rc;
478	}
479	}
480	}
481
482
483	/**
484	* Clean up after listener.
485	*/
486	static int rtUdpServerListenCleanup(PRTUDPSERVER pServer)
487	{
488	/*
489	* Close the server socket.
490	*/
491	rtUdpServerDestroySocket(&pServer->hSocket, "ListenCleanup");
492
493	/*
494	* Figure the return code and make sure the state is OK.
495	*/
496	RTUDPSERVERSTATE enmState = pServer->enmState;
497	switch (enmState)
498	{
499	case RTUDPSERVERSTATE_STOPPING:
500	case RTUDPSERVERSTATE_STOPPED:
501	return VERR_UDP_SERVER_SHUTDOWN;
502
503	case RTUDPSERVERSTATE_WAITING:
504	rtUdpServerTrySetState(pServer, RTUDPSERVERSTATE_STOPPED, enmState);
505	return VERR_UDP_SERVER_DESTROYED;
506
507	case RTUDPSERVERSTATE_DESTROYING:
508	return VERR_UDP_SERVER_DESTROYED;
509
510	case RTUDPSERVERSTATE_STARTING:
511	case RTUDPSERVERSTATE_RECEIVING:
512	default:
513	AssertMsgFailedReturn(("pServer=%p enmState=%d\n", pServer, enmState), VERR_INTERNAL_ERROR_4);
514	}
515	}
516
517
518	/**
519	* Shuts down the server.
520	*
521	* @returns IPRT status code.
522	* @param pServer Handle to the server.
523	*/
524	RTR3DECL(int) RTUdpServerShutdown(PRTUDPSERVER pServer)
525	{
526	/*
527	* Validate input and retain the instance.
528	*/
529	AssertPtrReturn(pServer, VERR_INVALID_HANDLE);
530	AssertReturn(pServer->u32Magic == RTUDPSERVER_MAGIC, VERR_INVALID_HANDLE);
531	AssertReturn(RTMemPoolRetain(pServer) != UINT32_MAX, VERR_INVALID_HANDLE);
532
533	/*
534	* Try change the state to stopping, then replace and destroy the server socket.
535	*/
536	for (;;)
537	{
538	RTUDPSERVERSTATE enmState = pServer->enmState;
539	if ( enmState != RTUDPSERVERSTATE_WAITING
540	&& enmState != RTUDPSERVERSTATE_RECEIVING)
541	{
542	RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
543	switch (enmState)
544	{
545	case RTUDPSERVERSTATE_CREATED:
546	case RTUDPSERVERSTATE_STARTING:
547	default:
548	AssertMsgFailed(("%d\n", enmState));
549	return VERR_INVALID_STATE;
550
551	case RTUDPSERVERSTATE_STOPPING:
552	case RTUDPSERVERSTATE_STOPPED:
553	return VINF_SUCCESS;
554
555	case RTUDPSERVERSTATE_DESTROYING:
556	return VERR_UDP_SERVER_DESTROYED;
557	}
558	}
559	if (rtUdpServerTrySetState(pServer, RTUDPSERVERSTATE_STOPPING, enmState))
560	{
561	rtUdpServerDestroySocket(&pServer->hSocket, "RTUdpServerShutdown");
562	rtUdpServerSetState(pServer, RTUDPSERVERSTATE_STOPPED, RTUDPSERVERSTATE_STOPPING);
563
564	RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
565	return VINF_SUCCESS;
566	}
567	}
568	}
569
570
571	/**
572	* Closes down and frees a UDP Server.
573	*
574	* @returns iprt status code.
575	* @param pServer Handle to the server.
576	*/
577	RTR3DECL(int) RTUdpServerDestroy(PRTUDPSERVER pServer)
578	{
579	/*
580	* Validate input and retain the instance.
581	*/
582	AssertPtrReturn(pServer, VERR_INVALID_HANDLE);
583	AssertReturn(pServer->u32Magic == RTUDPSERVER_MAGIC, VERR_INVALID_HANDLE);
584	AssertReturn(RTMemPoolRetain(pServer) != UINT32_MAX, VERR_INVALID_HANDLE); /* paranoia */
585
586	/*
587	* Move the state along so the listener can figure out what's going on.
588	*/
589	for (;;)
590	{
591	bool fDestroyable;
592	RTUDPSERVERSTATE enmState = pServer->enmState;
593	switch (enmState)
594	{
595	case RTUDPSERVERSTATE_STARTING:
596	case RTUDPSERVERSTATE_WAITING:
597	case RTUDPSERVERSTATE_RECEIVING:
598	case RTUDPSERVERSTATE_CREATED:
599	case RTUDPSERVERSTATE_STOPPED:
600	fDestroyable = rtUdpServerTrySetState(pServer, RTUDPSERVERSTATE_DESTROYING, enmState);
601	break;
602
603	/* destroyable states */
604	case RTUDPSERVERSTATE_STOPPING:
605	fDestroyable = true;
606	break;
607
608	/*
609	* Everything else means user or internal misbehavior.
610	*/
611	default:
612	AssertMsgFailed(("pServer=%p enmState=%d\n", pServer, enmState));
613	RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
614	return VERR_INTERNAL_ERROR;
615	}
616	if (fDestroyable)
617	break;
618	}
619
620	/*
621	* Destroy it.
622	*/
623	ASMAtomicWriteU32(&pServer->u32Magic, ~RTUDPSERVER_MAGIC);
624	rtUdpServerDestroySocket(&pServer->hSocket, "Destroyer: server");
625
626	/*
627	* Release it.
628	*/
629	RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
630	RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
631	return VINF_SUCCESS;
632	}
633
634
635	/**
636	* Internal close function which does all the proper bitching.
637	*/
638	static int rtUdpClose(RTSOCKET Sock, const char *pszMsg)
639	{
640	NOREF(pszMsg); /** @todo drop this parameter? */
641
642	/* ignore nil handles. */
643	if (Sock == NIL_RTSOCKET)
644	return VINF_SUCCESS;
645
646	/*
647	* Close the socket handle (drops our reference to it).
648	*/
649	return RTSocketClose(Sock);
650	}
651
652
653	RTR3DECL(int) RTUdpRead(RTSOCKET Sock, void pvBuffer, size_t cbBuffer, size_t pcbRead, PRTNETADDR pSrcAddr)
654	{
655	if (!RT_VALID_PTR(pcbRead))
656	return VERR_INVALID_POINTER;
657	return RTSocketReadFrom(Sock, pvBuffer, cbBuffer, pcbRead, pSrcAddr);
658	}
659
660
661	RTR3DECL(int) RTUdpWrite(PRTUDPSERVER pServer, const void *pvBuffer, size_t cbBuffer, PCRTNETADDR pDstAddr)
662	{
663	/*
664	* Validate input and retain the instance.
665	*/
666	AssertPtrReturn(pServer, VERR_INVALID_HANDLE);
667	AssertReturn(pServer->u32Magic == RTUDPSERVER_MAGIC, VERR_INVALID_HANDLE);
668	AssertReturn(RTMemPoolRetain(pServer) != UINT32_MAX, VERR_INVALID_HANDLE);
669
670	RTSOCKET hSocket;
671	ASMAtomicReadHandle(&pServer->hSocket, &hSocket);
672	if (hSocket == NIL_RTSOCKET)
673	{
674	RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
675	return VERR_INVALID_HANDLE;
676	}
677	RTSocketRetain(hSocket);
678
679	int rc = VINF_SUCCESS;
680	RTUDPSERVERSTATE enmState = pServer->enmState;
681	if ( enmState != RTUDPSERVERSTATE_CREATED
682	&& enmState != RTUDPSERVERSTATE_STARTING
683	&& enmState != RTUDPSERVERSTATE_WAITING
684	&& enmState != RTUDPSERVERSTATE_RECEIVING
685	&& enmState != RTUDPSERVERSTATE_STOPPING)
686	rc = VERR_INVALID_STATE;
687
688	if (RT_SUCCESS(rc))
689	rc = RTSocketWriteTo(hSocket, pvBuffer, cbBuffer, pDstAddr);
690
691	RTSocketRelease(hSocket);
692	RTMemPoolRelease(RTMEMPOOL_DEFAULT, pServer);
693
694	return rc;
695	}
696
697
698	RTR3DECL(int) RTUdpCreateClientSocket(const char *pszAddress, uint32_t uPort, PRTNETADDR pLocalAddr, PRTSOCKET pSock)
699	{
700	/*
701	* Validate input.
702	*/
703	AssertReturn(uPort > 0, VERR_INVALID_PARAMETER);
704	AssertPtrReturn(pszAddress, VERR_INVALID_POINTER);
705	AssertPtrReturn(pSock, VERR_INVALID_POINTER);
706
707	/*
708	* Resolve the address.
709	*/
710	RTNETADDR Addr;
711	int rc = RTSocketParseInetAddress(pszAddress, uPort, &Addr);
712	if (RT_FAILURE(rc))
713	return rc;
714
715	/*
716	* Create the socket and connect.
717	*/
718	RTSOCKET Sock;
719	rc = rtSocketCreate(&Sock, AF_INET, SOCK_DGRAM, 0, false /fInheritable/);
720	if (RT_SUCCESS(rc))
721	{
722	if (pLocalAddr)
723	rc = rtSocketBind(Sock, pLocalAddr);
724	if (RT_SUCCESS(rc))
725	{
726	rc = rtSocketConnect(Sock, &Addr, RT_SOCKETCONNECT_DEFAULT_WAIT);
727	if (RT_SUCCESS(rc))
728	{
729	*pSock = Sock;
730	return VINF_SUCCESS;
731	}
732	}
733	RTSocketClose(Sock);
734	}
735	return rc;
736	}
737
738
739	RTR3DECL(int) RTUdpCreateServerSocket(const char *pszAddress, uint32_t uPort, PRTSOCKET pSock)
740	{
741	/*
742	* Validate input.
743	*/
744	AssertReturn(uPort > 0, VERR_INVALID_PARAMETER);
745	AssertPtrReturn(pszAddress, VERR_INVALID_POINTER);
746	AssertPtrReturn(pSock, VERR_INVALID_POINTER);
747
748	/*
749	* Resolve the address.
750	*/
751	RTNETADDR LocalAddr;
752	int rc = RTSocketParseInetAddress(pszAddress, uPort, &LocalAddr);
753	if (RT_FAILURE(rc))
754	return rc;
755
756	/*
757	* Setting up socket.
758	*/
759	RTSOCKET Sock;
760	rc = rtSocketCreate(&Sock, AF_INET, SOCK_DGRAM, IPPROTO_UDP, false /fInheritable/);
761	if (RT_SUCCESS(rc))
762	{
763	/*
764	* Set socket options.
765	*/
766	int fFlag = 1;
767	if (!rtSocketSetOpt(Sock, SOL_SOCKET, SO_REUSEADDR, &fFlag, sizeof(fFlag)))
768	{
769	/*
770	* Bind a name to the socket.
771	*/
772	rc = rtSocketBind(Sock, &LocalAddr);
773	if (RT_SUCCESS(rc))
774	{
775	*pSock = Sock;
776	return VINF_SUCCESS;
777	}
778	}
779	RTSocketClose(Sock);
780	}
781	return rc;
782	}

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source: vbox/trunk/src/VBox/Runtime/r3/udp.cpp@ 99196

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