udptcpip.c@ 70836

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1	/* Copyright (c) 2001, Stanford University
2	* All rights reserved
3	*
4	* See the file LICENSE.txt for information on redistributing this software.
5	*/
6
7	#ifdef WINDOWS
8	#define WIN32_LEAN_AND_MEAN
9	#pragma warning( push, 3 )
10	#include <winsock2.h>
11	#include <ws2tcpip.h> /* for ipv6 */
12	#include <time.h>
13	#pragma warning( pop )
14	#pragma warning( disable : 4514 )
15	#pragma warning( disable : 4127 )
16	# ifndef VBOX
17	typedef int ssize_t;
18	# endif
19	#define write(a,b,c) send(a,b,c,0)
20	#else
21	#include <sys/types.h>
22	#if defined(OSF1)
23	typedef int socklen_t;
24	#endif
25	#include <sys/socket.h>
26	#include <sys/time.h>
27	#include <sys/ioctl.h>
28	#ifdef LINUX
29	#define IP_MTU 14
30	#endif
31	#include <netinet/in.h>
32	#if !defined(IRIX) /* ip6.h might not be present on other unix variants either */
33	#include <netinet/ip6.h>
34	#endif
35	#include <netinet/udp.h>
36	#ifndef DARWIN
37	#include <netinet/tcp.h>
38	#endif
39	#include <arpa/inet.h>
40	#include <netdb.h>
41	#include <unistd.h>
42	#endif
43
44	#include <limits.h>
45	#include <stdlib.h>
46	#include <stdio.h>
47	#include <errno.h>
48	#include <signal.h>
49	#include <string.h>
50	#ifdef AIX
51	#include <strings.h>
52	#endif
53
54	#include "cr_error.h"
55	#include "cr_mem.h"
56	#include "cr_string.h"
57	#include "cr_bufpool.h"
58	#include "cr_net.h"
59	#include "cr_endian.h"
60	#include "cr_threads.h"
61	#include "net_internals.h"
62
63	#ifdef ADDRINFO
64	#define PF PF_UNSPEC
65	#endif
66
67	#ifndef MSG_TRUNC
68	#define MSG_TRUNC 0
69	#endif
70
71	#ifdef IRIX
72	/* IRIX defines this token, but appears to be missing the related types
73	* and functions. Turn it off.
74	*/
75	#undef AF_INET6
76	#endif
77
78	#if defined( WINDOWS ) \|\| defined( IRIX ) \|\| defined( IRIX64 )
79	typedef int socklen_t;
80	#endif
81
82	static void
83	crUDPIPWriteExact( CRConnection conn, const void buf, unsigned int len )
84	{
85	int retval;
86	if ( len > conn->mtu + sizeof(conn->seq) )
87	{
88	crWarning( "crUDPIPWriteExact(%d): too big a packet for mtu %d, dropping !", len, (int)(conn->mtu + sizeof(conn->seq)) );
89	return;
90	}
91	retval = sendto( conn->udp_socket, buf, len, 0,
92	(struct sockaddr *) &(conn->remoteaddr), sizeof(conn->remoteaddr));
93	if ( retval <= 0 )
94	{
95	int err = crTCPIPErrno( );
96	crWarning( "crUDPIPWriteExact(%d): %s", len, crTCPIPErrorString( err ) );
97	#ifdef LINUX
98	if ( err == EMSGSIZE )
99	{
100	int opt;
101	socklen_t leno = sizeof(opt);
102	crDebug( "Too big a UDP packet(%d), looking at new MTU...", len );
103	if ( getsockopt( conn->udp_socket, SOL_IP, IP_MTU_DISCOVER, &opt, &leno) == -1)
104	{
105	err = crTCPIPErrno( );
106	crWarning( "Couldn't determine whether PMTU discovery is used : %s", crTCPIPErrorString( err ) );
107	return;
108	}
109	if ( leno != sizeof(opt) )
110	{
111	crWarning( "Unexpected length %d for PMTU_DISCOVERY option length", leno );
112	return;
113	}
114	if ( opt == IP_PMTUDISC_DONT )
115	{
116	crWarning( "Uh, PMTU discovery isn't enabled ?!" );
117	return;
118	}
119	if ( getsockopt( conn->udp_socket, SOL_IP, IP_MTU, &opt, &leno) == -1 )
120	{
121	err = crTCPIPErrno( );
122	crWarning( "Couldn't determine the MTU : %s", crTCPIPErrorString( err ) );
123	return;
124	}
125	if ( leno != sizeof(opt) )
126	{
127	crWarning( "Unexpected length %d for MTU option length", leno );
128	return;
129	}
130	opt -= sizeof(conn->seq) + sizeof(struct udphdr) + sizeof(struct ip6_hdr);
131	if (opt >= (int) conn->mtu)
132	{
133	crWarning( "But MTU discovery is still bigger ! Narrowing it by hand to %d", conn->mtu = (conn->mtu * 2 / 3) & ~0x3 );
134	}
135	else
136	{
137	crDebug( "new MTU is %d", opt );
138	conn->mtu = opt & ~0x3;
139	}
140	}
141	#endif
142	}
143	}
144
145	static void
146	crUDPTCPIPAccept( CRConnection conn, const char hostname, unsigned short port )
147	{
148	int err;
149	socklen_t addr_length;
150	#ifndef ADDRINFO
151	struct sockaddr addr;
152	struct sockaddr_in udpaddr;
153	#else
154	struct sockaddr_storage addr;
155	struct addrinfo res,cur;
156	struct addrinfo hints;
157	#endif
158
159	crTCPIPAccept( conn, hostname, port );
160
161	#ifndef ADDRINFO
162	conn->udp_socket = socket( AF_INET, SOCK_DGRAM, 0 );
163	if ( conn->udp_socket >= 0 )
164	{
165	memset(&udpaddr, 0, sizeof(udpaddr));
166	udpaddr.sin_family = AF_INET;
167	udpaddr.sin_addr.s_addr = INADDR_ANY;
168	udpaddr.sin_port = htons(0);
169	if ( bind( conn->udp_socket, (struct sockaddr *) &udpaddr, sizeof(udpaddr) ) )
170	{
171	err = crTCPIPErrno( );
172	crWarning( "Couldn't bind socket: %s", crTCPIPErrorString( err ) );
173	crCloseSocket( conn->udp_socket );
174	conn->udp_socket = -1;
175	}
176	}
177	#else
178	memset(&hints, 0, sizeof(hints));
179	hints.ai_flags = AI_PASSIVE;
180	hints.ai_family = PF;
181	hints.ai_socktype = SOCK_DGRAM;
182
183	err = getaddrinfo( NULL, "0", &hints, &res);
184	if ( err )
185	crError( "Couldn't find local UDP port: %s", gai_strerror(err));
186
187	conn->udp_socket = -1;
188
189	for (cur=res;cur;cur=cur->ai_next)
190	{
191	conn->udp_socket = socket( cur->ai_family, cur->ai_socktype, cur->ai_protocol );
192	if ( conn->udp_socket == -1 )
193	{
194	err = crTCPIPErrno( );
195	if (err != EAFNOSUPPORT)
196	crWarning( "Couldn't create socket of family %i: %s, trying another one", cur->ai_family, crTCPIPErrorString( err ) );
197	continue;
198	}
199	if ( bind( conn->udp_socket, cur->ai_addr, cur->ai_addrlen ) )
200	{
201	err = crTCPIPErrno( );
202	crWarning( "Couldn't bind socket: %s", crTCPIPErrorString( err ) );
203	crCloseSocket( conn->udp_socket );
204	conn->udp_socket = -1;
205	continue;
206	}
207	break;
208
209	}
210	freeaddrinfo(res);
211	#endif
212
213	if ( conn->udp_socket < 0 )
214	crError( "Couldn't find local UDP port" );
215
216	addr_length = sizeof(addr);
217	err = getsockname( conn->udp_socket, (struct sockaddr *) &addr, &addr_length );
218
219	if ( err == -1 )
220	crError( "Couldn't get our local UDP port: %s", crTCPIPErrorString( crTCPIPErrno( ) ) );
221
222	switch (((struct sockaddr *) &addr)->sa_family) {
223	case AF_INET:
224	crTCPIPWriteExact( conn, &((struct sockaddr_in *)&addr)->sin_port,
225	sizeof(((struct sockaddr_in *)&addr)->sin_port));
226	break;
227	#ifdef AF_INET6
228	case AF_INET6:
229	crTCPIPWriteExact( conn, &((struct sockaddr_in6 *)&addr)->sin6_port,
230	sizeof(((struct sockaddr_in6 *)&addr)->sin6_port));
231	break;
232	#endif
233	default:
234	crError( "Unknown address family: %d", ((struct sockaddr *) &addr)->sa_family);
235	}
236	}
237
238
239	static unsigned int safelen=0;
240	static void crUDPTCPIPSend( CRConnection conn, void *bufp,
241	const void *start, unsigned int len )
242	{
243	static unsigned int safedone=0;
244	CRTCPIPBuffer *udptcpip_buffer;
245	unsigned int *lenp;
246
247	if ( !conn \|\| conn->type == CR_NO_CONNECTION )
248	return;
249
250	if ( safelen+len > safelen )
251	{
252	safelen+=len;
253	if (safelen-safedone>100000)
254	{
255	safedone=safelen;
256	crDebug( "%dKo safe", safelen/1024 );
257	}
258	}
259
260	conn->seq++;
261	if ( bufp == NULL )
262	{
263	unsigned int len_swap = conn->swap ? SWAP32(len) : len;
264	/* we are doing synchronous sends from user memory, so no need
265	* to get fancy. Simply write the length & the payload and
266	* return. */
267	crTCPIPWriteExact( conn, &len_swap, sizeof(len_swap) );
268	if ( conn->type == CR_NO_CONNECTION ) return;
269	crTCPIPWriteExact( conn, start, len );
270	return;
271	}
272
273	udptcpip_buffer = (CRTCPIPBuffer )(bufp) - 1;
274
275	CRASSERT( udptcpip_buffer->magic == CR_TCPIP_BUFFER_MAGIC );
276
277	/* All of the buffers passed to the send function were allocated
278	* with crTCPIPAlloc(), which includes a header with a 4 byte
279	* length field, to insure that we always have a place to write
280	* the length field, even when start == bufp. /
281	lenp = (unsigned int *) start - 1;
282	if (conn->swap)
283	{
284	*lenp = SWAP32(len);
285	}
286	else
287	{
288	*lenp = len;
289	}
290
291	if ( __tcpip_write_exact( conn->tcp_socket, lenp, len + sizeof(*lenp) ) < 0 )
292	{
293	__tcpip_dead_connection( conn );
294	}
295
296	/* reclaim this pointer for reuse and try to keep the client from
297	accidentally reusing it directly */
298	#ifdef CHROMIUM_THREADSAFE
299	crLockMutex(&cr_tcpip.mutex);
300	#endif
301	crBufferPoolPush( cr_tcpip.bufpool, udptcpip_buffer, conn->buffer_size );
302	/* Since the buffer's now in the 'free' buffer pool, the caller can't
303	* use it any more. Setting bufp to NULL will make sure the caller
304	* doesn't try to re-use the buffer.
305	*/
306	*bufp = NULL;
307	#ifdef CHROMIUM_THREADSAFE
308	crUnlockMutex(&cr_tcpip.mutex);
309	#endif
310	}
311
312	static unsigned int barflen=0;
313	static void crUDPTCPIPBarf( CRConnection conn, void *bufp,
314	const void *start, unsigned int len)
315	{
316	static unsigned int barfdone=0;
317	static const unsigned int sizes[]={
318	0,10,50,100,500,1000,5000,10000,UINT_MAX
319	};
320	static unsigned int nbs[sizeof(sizes)/sizeof(int)] = {
321	0, 0, 0, 0, 0, 0, 0, 0, 0
322	};
323	static unsigned int nb;
324	unsigned int *seqp;
325	CRTCPIPBuffer *udptcpip_buffer;
326	int i;
327
328	if (!bufp) {
329	crDebug("writing safely %d bytes because from user memory",len);
330	crUDPTCPIPSend( conn, bufp, start, len);
331	return;
332	}
333	if (len > conn->mtu) {
334	crDebug("writing safely %d bytes because that is too much for MTU %d", len, conn->mtu);
335	crUDPTCPIPSend( conn, bufp, start, len);
336	return;
337	}
338
339	if ( barflen+len > barflen )
340	{
341	barflen+=len;
342	nb++;
343	for(i=0;;i++)
344	if (len > sizes[i] && len <= sizes[i+1]) {
345	nbs[i]++;
346	break;
347	}
348	if (barflen-barfdone>1<<22) {
349	barfdone=barflen;
350	crDebug( "send traffic: %d%sMo barfed %dKo safe", barflen/(1024*1024), barflen?"":".0", safelen/1024 );
351	if (nb) {
352	for (i=0; i < (int) (sizeof(sizes)/sizeof(int)-1); i++)
353	fprintf(stderr,"%u:%u%s%% ",sizes[i],(nbs[i]*100)/nb,nbs[i]==0?".0":"");
354	fprintf(stderr,"\n");
355	}
356	}
357	}
358
359	udptcpip_buffer = (CRTCPIPBuffer )(bufp) - 1;
360
361	CRASSERT( udptcpip_buffer->magic == CR_TCPIP_BUFFER_MAGIC );
362
363	seqp = (unsigned int *) start - 1;
364	if (conn->swap)
365	{
366	*seqp = SWAP32(conn->seq);
367	}
368	else
369	{
370	*seqp = conn->seq;
371	}
372	crUDPIPWriteExact( conn, seqp, len + sizeof(*seqp) );
373
374	/* reclaim this pointer for reuse and try to keep the client from
375	accidentally reusing it directly */
376	#ifdef CHROMIUM_THREADSAFE
377	crLockMutex(&cr_tcpip.mutex);
378	#endif
379	crBufferPoolPush( cr_tcpip.bufpool, udptcpip_buffer, conn->buffer_size );
380	#ifdef CHROMIUM_THREADSAFE
381	crUnlockMutex(&cr_tcpip.mutex);
382	#endif
383	*bufp = NULL;
384	}
385
386	static void
387	crUDPTCPIPReceive( CRConnection conn, CRTCPIPBuffer buf, int len )
388	{
389	CRMessage *msg;
390	CRMessageType cached_type;
391	#if 0
392	crLogRead( len );
393	#endif
394
395	conn->recv_credits -= len;
396
397	conn->total_bytes_recv += len;
398
399	msg = (CRMessage *) (buf + 1);
400	cached_type = msg->header.type;
401	if (conn->swap)
402	{
403	msg->header.type = (CRMessageType) SWAP32( msg->header.type );
404	msg->header.conn_id = (CRMessageType) SWAP32( msg->header.conn_id );
405	}
406
407	crNetDispatchMessage( cr_tcpip.recv_list, conn, msg, len );
408
409	/* CR_MESSAGE_OPCODES is freed in
410	* crserverlib/server_stream.c
411	*
412	* OOB messages are the programmer's problem. -- Humper 12/17/01 */
413	if (cached_type != CR_MESSAGE_OPCODES && cached_type != CR_MESSAGE_OOB)
414	{
415	crTCPIPFree( conn, buf + 1 );
416	}
417	}
418
419	int
420	crUDPTCPIPRecv( void )
421	{
422	int num_ready, max_fd;
423	fd_set read_fds;
424	int i;
425	/* ensure we don't get caught with a new thread connecting */
426	int num_conns = cr_tcpip.num_conns;
427
428	#ifdef CHROMIUM_THREADSAFE
429	crLockMutex(&cr_tcpip.recvmutex);
430	#endif
431
432	max_fd = 0;
433	FD_ZERO( &read_fds );
434	for ( i = 0; i < num_conns; i++ )
435	{
436	CRConnection *conn = cr_tcpip.conns[i];
437	if ( !conn \|\| conn->type == CR_NO_CONNECTION ) continue;
438	if ( conn->recv_credits > 0 \|\| conn->type != CR_UDPTCPIP )
439	{
440	/*
441	* NOTE: may want to always put the FD in the descriptor
442	* set so we'll notice broken connections. Down in the
443	* loop that iterates over the ready sockets only peek
444	* (MSG_PEEK flag to recv()?) if the connection isn't
445	* enabled.
446	*/
447	CRSocket sock = conn->tcp_socket;
448
449	if (conn->type != CR_UDPTCPIP)
450	continue;
451
452	if ( (int) sock + 1 > max_fd )
453	max_fd = (int) sock + 1;
454	FD_SET( sock, &read_fds );
455
456	sock = conn->udp_socket;
457	if ( (int) sock + 1 > max_fd )
458	max_fd = (int) sock + 1;
459	FD_SET( sock, &read_fds );
460	}
461	}
462
463	if (!max_fd) {
464	#ifdef CHROMIUM_THREADSAFE
465	crUnlockMutex(&cr_tcpip.recvmutex);
466	#endif
467	return 0;
468	}
469
470	if ( num_conns )
471	{
472	num_ready = __crSelect( max_fd, &read_fds, 0, 500 );
473	}
474	else
475	{
476	crWarning( "Waiting for first connection..." );
477	num_ready = __crSelect( max_fd, &read_fds, 0, 0 );
478	}
479
480	if ( num_ready == 0 ) {
481	#ifdef CHROMIUM_THREADSAFE
482	crUnlockMutex(&cr_tcpip.recvmutex);
483	#endif
484	return 0;
485	}
486
487	for ( i = 0; i < num_conns; i++ )
488	{
489	CRConnection *conn = cr_tcpip.conns[i];
490	CRTCPIPBuffer *buf;
491	int len;
492	int sock;
493
494	if ( !conn \|\| conn->type == CR_NO_CONNECTION ) continue;
495
496	if ( conn->type != CR_UDPTCPIP )
497	continue;
498
499	if ( conn->udp_packet ) {
500	unsigned int *seq;
501	buf = conn->udp_packet;
502	seq = (unsigned int *)(buf + 1) - 1;
503	if ( *seq == conn->ack )
504	{
505	crUDPTCPIPReceive( conn, buf,
506	conn->udp_packetlen );
507	conn->udp_packet = NULL;
508	i--; /* can now read other packets */
509	continue;
510	}
511	if ( *seq - conn->ack > (~(0U)) >> 1 )
512	{
513	crError( "%u is older than %u ?!", *seq, conn->ack );
514	crTCPIPFree( conn, buf + 1 );
515	conn->udp_packet = NULL;
516	i--; /* can now read other packets */
517	continue;
518	}
519	/* still too early, wait for TCP data */
520	}
521	else if ( FD_ISSET(conn->udp_socket, &read_fds ) )
522	{
523	unsigned int *seq;
524	buf = ((CRTCPIPBuffer *) crTCPIPAlloc( conn )) - 1;
525	seq = ((unsigned int *) (buf + 1)) - 1;
526
527	len = recv( conn->udp_socket, (void *)seq,
528	buf->allocated + sizeof(*seq), MSG_TRUNC );
529
530	CRASSERT( len > 0 );
531	CRASSERT( (unsigned int)len <= buf->allocated + sizeof(*seq) );
532	if ( len < (int) sizeof(*seq) )
533	{
534	crWarning( "too short a UDP packet : %d", len);
535	crTCPIPFree( conn, buf + 1 );
536	continue;
537	}
538
539	buf->len = len;
540
541	if ( *seq == conn->ack)
542	{
543	crUDPTCPIPReceive( conn, buf, len );
544	continue;
545	}
546
547	if ( *seq - conn->ack > (~(0U)) >> 1 )
548	{
549	crWarning( "%u is older than %u, dropping", *seq, conn->ack );
550	crTCPIPFree( conn, buf + 1 );
551	continue;
552	}
553	conn->udp_packet = buf;
554	conn->udp_packetlen = len;
555	}
556
557	sock = conn->tcp_socket;
558	if ( !FD_ISSET( sock, &read_fds ) )
559	continue;
560
561	if ( __tcpip_read_exact( sock, &len, sizeof(len)) <= 0 )
562	{
563	__tcpip_dead_connection( conn );
564	i--;
565	continue;
566	}
567
568	if (conn->swap)
569	{
570	len = SWAP32(len);
571	}
572
573	CRASSERT( len > 0 );
574
575	if ( (unsigned int)len <= conn->buffer_size )
576	{
577	buf = (CRTCPIPBuffer *) crTCPIPAlloc( conn ) - 1;
578	}
579	else
580	{
581	buf = (CRTCPIPBuffer *)
582	crAlloc( sizeof(*buf) + len );
583	buf->magic = CR_TCPIP_BUFFER_MAGIC;
584	buf->kind = CRTCPIPMemoryBig;
585	buf->pad = 0;
586	}
587
588	buf->len = len;
589
590	if ( __tcpip_read_exact( sock, buf + 1, len ) <= 0 )
591	{
592	crWarning( "Bad juju: %d %d", buf->allocated, len );
593	crFree( buf );
594	__tcpip_dead_connection( conn );
595	i--;
596	continue;
597	}
598
599	crUDPTCPIPReceive( conn, buf, len );
600	conn->ack++;
601	}
602
603	#ifdef CHROMIUM_THREADSAFE
604	crUnlockMutex(&cr_tcpip.recvmutex);
605	#endif
606
607	return 1;
608	}
609
610	void crUDPTCPIPInit( CRNetReceiveFuncList rfl, CRNetCloseFuncList cfl, unsigned int mtu )
611	{
612	crTCPIPInit( rfl, cfl, mtu );
613	}
614
615	/* The function that actually connects. This should only be called by clients
616	* Servers have another way to set up the socket. */
617
618	static int crUDPTCPIPDoConnect( CRConnection *conn )
619	{
620	#ifdef WINDOWS
621	unsigned short port;
622	#else
623	in_port_t port;
624	#endif
625	#ifdef LINUX
626	int opt = IP_PMTUDISC_DO;
627	#endif
628	#ifndef ADDRINFO
629	struct hostent *hp;
630	#else
631	int err;
632	char port_s[NI_MAXSERV];
633	struct addrinfo res,cur;
634	struct addrinfo hints;
635	#endif
636
637	/* first connect to its tcp port */
638	if ( !crTCPIPDoConnect( conn ) )
639	return 0;
640
641	/* read its UDP port */
642	crTCPIPReadExact( conn, &port, sizeof( port ) );
643	port = ntohs(port);
644
645	crDebug( "Server's UDP port is %d", port);
646
647	/* and connect to it */
648	#ifndef ADDRINFO
649	hp = gethostbyname( conn->hostname );
650	if ( !hp )
651	{
652	crWarning( "Unknown host: \"%s\"", conn->hostname );
653	return 0;
654	}
655	conn->udp_socket = socket( AF_INET, SOCK_DGRAM, 0 );
656	memset(&conn->remoteaddr, 0, sizeof(conn->remoteaddr));
657	conn->remoteaddr.sin_family = AF_INET;
658	conn->remoteaddr.sin_port = htons( (short) port );
659
660	memcpy( (char *) &conn->remoteaddr.sin_addr, hp->h_addr,
661	sizeof(conn->remoteaddr.sin_addr) );
662	if ( conn->udp_socket >= 0 ) {
663	if ( connect( conn->udp_socket, (struct sockaddr *) &conn->remoteaddr,
664	sizeof(conn->remoteaddr) ) == -1 )
665	crWarning( "Couldn't connect UDP socket : %s", crTCPIPErrorString( crTCPIPErrno( ) ) );
666	} else {
667	#else
668	sprintf(port_s, "%u", port);
669
670	memset(&hints, 0, sizeof(hints));
671	hints.ai_family = PF;
672	hints.ai_socktype = SOCK_DGRAM;
673
674	err = getaddrinfo( conn->hostname, port_s, &hints, &res);
675	if ( err )
676	{
677	crWarning( "Unknown host: \"%s\": %s", conn->hostname, gai_strerror(err) );
678	return 0;
679	}
680
681	for (cur=res;cur;)
682	{
683	conn->udp_socket = socket( cur->ai_family, cur->ai_socktype, cur->ai_protocol );
684	if ( conn->udp_socket >= 0 )
685	{
686	if ( connect( conn->udp_socket, cur->ai_addr, cur->ai_addrlen ) == -1 )
687	crWarning( "Couldn't connect UDP socket : %s", crTCPIPErrorString( crTCPIPErrno( ) ) );
688	break;
689	}
690	err = crTCPIPErrno( );
691	if (err != EAFNOSUPPORT)
692	crWarning( "socket error: %s, trying another way", crTCPIPErrorString( err ) );
693	cur=cur->ai_next;
694	}
695	if (!cur) {
696	freeaddrinfo(res);
697	#endif
698	crWarning( "Couldn't find any suitable way to connect to %s:%d", conn->hostname, port );
699	return 0;
700	}
701
702	#ifdef LINUX
703	if ( setsockopt(conn->udp_socket, SOL_IP, IP_MTU_DISCOVER, &opt, sizeof(opt)) == -1 )
704	{
705	err = crTCPIPErrno( );
706	crWarning( "MTU discovery can't be activated : %s", crTCPIPErrorString( err ) );
707	}
708	else
709	{
710	socklen_t len = sizeof(opt);
711	if ( getsockopt(conn->udp_socket, SOL_IP, IP_MTU, &opt, &len) == -1 )
712	crWarning( "MTU couldn't be got : %s", crTCPIPErrorString( crTCPIPErrno ( ) ) );
713	else
714	if ( len != sizeof(opt) )
715	crWarning( "Unexpected length %d for MTU option length", len );
716	else
717	{
718	opt -= sizeof(conn->seq) + sizeof(struct udphdr) + sizeof(struct ip6_hdr);
719	crDebug( "MTU is (for now) %d", opt );
720	conn->mtu = opt;
721	}
722	}
723	#endif
724	#ifdef ADDRINFO
725	crMemcpy(&conn->remoteaddr, cur->ai_addr, cur->ai_addrlen);
726	freeaddrinfo(res);
727	#endif
728	return 1;
729	}
730
731	static void crUDPTCPIPDoDisconnect( CRConnection *conn )
732	{
733	crCloseSocket( conn->udp_socket );
734	crTCPIPDoDisconnect( conn );
735	}
736
737	void crUDPTCPIPConnection( CRConnection *conn )
738	{
739	crTCPIPConnection( conn );
740
741	conn->type = CR_UDPTCPIP;
742	conn->Send = crUDPTCPIPSend;
743	conn->Barf = crUDPTCPIPBarf;
744	conn->SendExact = NULL;
745	conn->Recv = NULL; /* none for UDP : must multiplex ! */
746	conn->Accept = crUDPTCPIPAccept;
747	conn->Connect = crUDPTCPIPDoConnect;
748	conn->Disconnect = crUDPTCPIPDoDisconnect;
749	conn->seq = 0;
750	conn->ack = 0;
751	conn->udp_packet = NULL;
752	conn->mtu -= sizeof(conn->seq); /* some room for seq */
753	}

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source: vbox/trunk/src/VBox/GuestHost/OpenGL/util/udptcpip.c@ 70836

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