tcpip.c@ 62425

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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	#pragma warning( pop )
12	#pragma warning( disable : 4514 )
13	#pragma warning( disable : 4127 )
14	# ifndef VBOX
15	typedef int ssize_t;
16	# endif
17	#else
18	#include <sys/types.h>
19	#include <sys/wait.h>
20	#ifdef OSF1
21	typedef int socklen_t;
22	#endif
23	#include <sys/socket.h>
24	#include <sys/time.h>
25	#include <netinet/in.h>
26	#include <netinet/tcp.h>
27	#include <arpa/inet.h>
28	#include <netdb.h>
29	#include <unistd.h>
30	#endif
31
32	#include <limits.h>
33	#include <stdlib.h>
34	#include <stdio.h>
35	#include <errno.h>
36	#include <signal.h>
37	#include <string.h>
38	#ifdef AIX
39	#include <strings.h>
40	#endif
41
42	#ifdef LINUX
43	#include <sys/ioctl.h>
44	#include <unistd.h>
45	#endif
46
47	#include "cr_error.h"
48	#include "cr_mem.h"
49	#include "cr_string.h"
50	#include "cr_bufpool.h"
51	#include "cr_net.h"
52	#include "cr_endian.h"
53	#include "cr_threads.h"
54	#include "cr_environment.h"
55	#include "net_internals.h"
56
57	#ifdef ADDRINFO
58	#define PF PF_UNSPEC
59	#endif
60
61	#ifdef WINDOWS
62	#define EADDRINUSE WSAEADDRINUSE
63	#define ECONNREFUSED WSAECONNREFUSED
64	#endif
65
66	#ifdef WINDOWS
67
68	#undef ECONNRESET
69	#define ECONNRESET WSAECONNRESET
70	#undef EINTR
71	#define EINTR WSAEINTR
72
73	int crTCPIPErrno( void )
74	{
75	return WSAGetLastError( );
76	}
77
78	char *crTCPIPErrorString( int err )
79	{
80	static char buf[512], *temp;
81
82	sprintf( buf, "err=%d", err );
83
84	#define X(x) crStrcpy(buf,x); break
85
86	switch ( err )
87	{
88	case WSAECONNREFUSED: X( "connection refused" );
89	case WSAECONNRESET: X( "connection reset" );
90	default:
91	FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER \|
92	FORMAT_MESSAGE_FROM_SYSTEM \|
93	FORMAT_MESSAGE_MAX_WIDTH_MASK, NULL, err,
94	MAKELANGID( LANG_NEUTRAL, SUBLANG_DEFAULT ),
95	(LPTSTR) &temp, 0, NULL );
96	if ( temp )
97	{
98	crStrncpy( buf, temp, sizeof(buf)-1 );
99	buf[sizeof(buf)-1] = 0;
100	}
101	}
102
103	#undef X
104
105	temp = buf + crStrlen(buf) - 1;
106	while ( temp > buf && isspace( *temp ) )
107	{
108	*temp = '\0';
109	temp--;
110	}
111
112	return buf;
113	}
114
115	#else /* WINDOWS */
116
117	int crTCPIPErrno( void )
118	{
119	int err = errno;
120	errno = 0;
121	return err;
122	}
123
124	char *crTCPIPErrorString( int err )
125	{
126	static char buf[512], *temp;
127
128	temp = strerror( err );
129	if ( temp )
130	{
131	crStrncpy( buf, temp, sizeof(buf)-1 );
132	buf[sizeof(buf)-1] = 0;
133	}
134	else
135	{
136	sprintf( buf, "err=%d", err );
137	}
138
139	return buf;
140	}
141
142	#endif /* WINDOWS */
143
144
145	/*
146	* Socket callbacks. When a socket is created or destroyed we will
147	* call these callback functions.
148	* XXX Currently only implemented for TCP/IP.
149	* XXX Maybe have lists of callbacks?
150	*/
151	static CRSocketCallbackProc SocketCreateCallback = NULL;
152	static CRSocketCallbackProc SocketDestroyCallback = NULL;
153
154	void
155	crRegisterSocketCallback(int mode, CRSocketCallbackProc proc)
156	{
157	if (mode == CR_SOCKET_CREATE) {
158	SocketCreateCallback = proc;
159	}
160	else if (mode == CR_SOCKET_DESTROY) {
161	SocketDestroyCallback = proc;
162	}
163	else {
164	crError("Invalid crRegisterSocketCallbac mode=%d", mode);
165	}
166	}
167
168
169
170	void crCloseSocket( CRSocket sock )
171	{
172	int fail;
173
174	if (sock <= 0)
175	return;
176
177	if (SocketDestroyCallback) {
178	SocketDestroyCallback(CR_SOCKET_DESTROY, sock);
179	}
180
181	#ifdef WINDOWS
182	fail = ( closesocket( sock ) != 0 );
183	#else
184	shutdown( sock, 2 /* RDWR */ );
185	fail = ( close( sock ) != 0 );
186	#endif
187	if ( fail )
188	{
189	int err = crTCPIPErrno( );
190	crWarning( "crCloseSocket( sock=%d ): %s",
191	sock, crTCPIPErrorString( err ) );
192	}
193	}
194
195	cr_tcpip_data cr_tcpip;
196
197	/**
198	* Read len bytes from socket, and store in buffer.
199	* \return 1 if success, -1 if error, 0 if sender exited.
200	*/
201	int
202	__tcpip_read_exact( CRSocket sock, void *buf, unsigned int len )
203	{
204	char dst = (char ) buf;
205	/*
206	* Shouldn't write to a non-existent socket, ie when
207	* crTCPIPDoDisconnect has removed it from the pool
208	*/
209	if ( sock <= 0 )
210	return 1;
211
212	while ( len > 0 )
213	{
214	const int num_read = recv( sock, dst, (int) len, 0 );
215
216	#ifdef WINDOWS_XXXX
217	/* MWE: why is this necessary for windows??? Does it return a
218	"good" value for num_bytes despite having a reset
219	connection? */
220	if ( crTCPIPErrno( ) == ECONNRESET )
221	return -1;
222	#endif
223
224	if ( num_read < 0 )
225	{
226	int error = crTCPIPErrno();
227	switch( error )
228	{
229	case EINTR:
230	crWarning( "__tcpip_read_exact(TCPIP): "
231	"caught an EINTR, looping for more data" );
232	continue;
233	case EFAULT:
234	crWarning( "EFAULT" );
235	break;
236	case EINVAL:
237	crWarning( "EINVAL" );
238	break;
239	default:
240	break;
241	}
242	crWarning( "Bad bad bad socket error: %s", crTCPIPErrorString( error ) );
243	return -1;
244	}
245
246	if ( num_read == 0 )
247	{
248	/* client exited gracefully */
249	return 0;
250	}
251
252	dst += num_read;
253	len -= num_read;
254	}
255
256	return 1;
257	}
258
259	void
260	crTCPIPReadExact( CRConnection conn, void buf, unsigned int len )
261	{
262	if ( __tcpip_read_exact( conn->tcp_socket, buf, len ) <= 0 )
263	{
264	__tcpip_dead_connection( conn );
265	}
266	}
267
268	/**
269	* Write the given buffer of len bytes on the socket.
270	* \return 1 if OK, negative value if error.
271	*/
272	int
273	__tcpip_write_exact( CRSocket sock, const void *buf, unsigned int len )
274	{
275	const char src = (const char ) buf;
276
277	/*
278	* Shouldn't write to a non-existent socket, ie when
279	* crTCPIPDoDisconnect has removed it from the pool
280	*/
281	if ( sock <= 0 )
282	return 1;
283
284	while ( len > 0 )
285	{
286	const int num_written = send( sock, src, len, 0 );
287	if ( num_written <= 0 )
288	{
289	int err;
290	if ( (err = crTCPIPErrno( )) == EINTR )
291	{
292	crWarning("__tcpip_write_exact(TCPIP): caught an EINTR, continuing");
293	continue;
294	}
295
296	return -err;
297	}
298
299	len -= num_written;
300	src += num_written;
301	}
302
303	return 1;
304	}
305
306	void
307	crTCPIPWriteExact( CRConnection conn, const void buf, unsigned int len )
308	{
309	if ( __tcpip_write_exact( conn->tcp_socket, buf, len) <= 0 )
310	{
311	__tcpip_dead_connection( conn );
312	}
313	}
314
315
316	/**
317	* Make sockets do what we want:
318	*
319	* 1) Change the size of the send/receive buffers to 64K
320	* 2) Turn off Nagle's algorithm
321	*/
322	static void
323	spankSocket( CRSocket sock )
324	{
325	/* why do we do 1) ? things work much better for me to push the
326	* the buffer size way up -- karl
327	*/
328	#ifdef LINUX
329	int sndbuf = 110241024;
330	#else
331	int sndbuf = 64*1024;
332	#endif
333
334	int rcvbuf = sndbuf;
335	int so_reuseaddr = 1;
336	int tcp_nodelay = 1;
337
338	if ( setsockopt( sock, SOL_SOCKET, SO_SNDBUF,
339	(char *) &sndbuf, sizeof(sndbuf) ) )
340	{
341	int err = crTCPIPErrno( );
342	crWarning( "setsockopt( SO_SNDBUF=%d ) : %s",
343	sndbuf, crTCPIPErrorString( err ) );
344	}
345
346	if ( setsockopt( sock, SOL_SOCKET, SO_RCVBUF,
347	(char *) &rcvbuf, sizeof(rcvbuf) ) )
348	{
349	int err = crTCPIPErrno( );
350	crWarning( "setsockopt( SO_RCVBUF=%d ) : %s",
351	rcvbuf, crTCPIPErrorString( err ) );
352	}
353
354
355	if ( setsockopt( sock, SOL_SOCKET, SO_REUSEADDR,
356	(char *) &so_reuseaddr, sizeof(so_reuseaddr) ) )
357	{
358	int err = crTCPIPErrno( );
359	crWarning( "setsockopt( SO_REUSEADDR=%d ) : %s",
360	so_reuseaddr, crTCPIPErrorString( err ) );
361	}
362
363	if ( setsockopt( sock, IPPROTO_TCP, TCP_NODELAY,
364	(char *) &tcp_nodelay, sizeof(tcp_nodelay) ) )
365	{
366	int err = crTCPIPErrno( );
367	crWarning( "setsockopt( TCP_NODELAY=%d )"
368	" : %s", tcp_nodelay, crTCPIPErrorString( err ) );
369	}
370	}
371
372
373	#if defined( WINDOWS ) \|\| defined( IRIX ) \|\| defined( IRIX64 )
374	typedef int socklen_t;
375	#endif
376
377
378	/**
379	* Create a listening socket using the given port.
380	* Caller can then pass the socket to accept().
381	* If the port is one that's been seen before, we'll reuse/return the
382	* previously create socket.
383	*/
384	static int
385	CreateListeningSocket(int port)
386	{
387	/* XXX should use an unbounded list here instead of parallel arrays... */
388	#define MAX_PORTS 100
389	static int ports[MAX_PORTS];
390	static int sockets[MAX_PORTS];
391	static int count = 0;
392	int i, sock = -1;
393
394	/* search to see if we've seen this port before */
395	for (i = 0; i < count; i++) {
396	if (ports[i] == port) {
397	return sockets[i];
398	}
399	}
400
401	/* new port so create new socket */
402	{
403	int err;
404	#ifndef ADDRINFO
405	struct sockaddr_in servaddr;
406	#endif
407
408	/* with the new OOB stuff, we can have multiple ports being
409	* accepted on, so we need to redo the server socket every time.
410	*/
411	#ifndef ADDRINFO
412	sock = socket( AF_INET, SOCK_STREAM, 0 );
413	if ( sock == -1 )
414	{
415	err = crTCPIPErrno( );
416	crError( "Couldn't create socket: %s", crTCPIPErrorString( err ) );
417	}
418	spankSocket( sock );
419
420	servaddr.sin_family = AF_INET;
421	servaddr.sin_addr.s_addr = INADDR_ANY;
422	servaddr.sin_port = htons( (short) port );
423
424	if ( bind( sock, (struct sockaddr *) &servaddr, sizeof(servaddr) ) )
425	{
426	err = crTCPIPErrno( );
427	crError( "Couldn't bind to socket (port=%d): %s",
428	port, crTCPIPErrorString( err ) );
429	}
430
431	if ( listen( sock, 100 /* max pending connections */ ) )
432	{
433	err = crTCPIPErrno( );
434	crError( "Couldn't listen on socket: %s", crTCPIPErrorString( err ) );
435	}
436	#else
437	char port_s[NI_MAXSERV];
438	struct addrinfo res,cur;
439	struct addrinfo hints;
440
441	sprintf(port_s, "%u", (short unsigned) port);
442
443	crMemset(&hints, 0, sizeof(hints));
444	hints.ai_flags = AI_PASSIVE;
445	hints.ai_family = PF;
446	hints.ai_socktype = SOCK_STREAM;
447
448	err = getaddrinfo( NULL, port_s, &hints, &res );
449	if ( err )
450	crError( "Couldn't find local TCP port %s: %s",
451	port_s, gai_strerror(err) );
452
453	for (cur=res;cur;cur=cur->ai_next)
454	{
455	sock = socket( cur->ai_family, cur->ai_socktype, cur->ai_protocol );
456	if ( sock == -1 )
457	{
458	err = crTCPIPErrno( );
459	if (err != EAFNOSUPPORT)
460	crWarning("Couldn't create socket of family %i: %s, trying another",
461	cur->ai_family, crTCPIPErrorString( err ) );
462	continue;
463	}
464	spankSocket( sock );
465
466	if ( bind( sock, cur->ai_addr, cur->ai_addrlen ) )
467	{
468	err = crTCPIPErrno( );
469	crWarning( "Couldn't bind to socket (port=%d): %s",
470	port, crTCPIPErrorString( err ) );
471	crCloseSocket( sock );
472	continue;
473	}
474
475	if ( listen( sock, 100 /* max pending connections */ ) )
476	{
477	err = crTCPIPErrno( );
478	crWarning("Couldn't listen on socket: %s", crTCPIPErrorString(err));
479	crCloseSocket( sock );
480	continue;
481	}
482	break;
483	}
484	freeaddrinfo(res);
485	if (!cur)
486	crError( "Couldn't find/bind local TCP port %s", port_s);
487	#endif
488	}
489
490	/* save the new port/socket */
491	if (count == MAX_PORTS) {
492	crError("Fatal error in tcpip layer: too many listening ports/sockets");
493	}
494	ports[count] = port;
495	sockets[count] = sock;
496	count++;
497
498	return sock;
499	}
500
501
502
503
504	void
505	crTCPIPAccept( CRConnection conn, const char hostname, unsigned short port )
506	{
507	int err;
508	socklen_t addr_length;
509	#ifndef ADDRINFO
510	struct hostent *host;
511	struct in_addr sin_addr;
512	struct sockaddr addr;
513	#else
514	struct sockaddr_storage addr;
515	char host[NI_MAXHOST];
516	#endif
517
518	cr_tcpip.server_sock = CreateListeningSocket(port);
519
520	/* If brokered, we'll contact the mothership to broker the network
521	* connection. We'll send the mothership our hostname, the port and
522	* our endianness and will get in return a connection ID number.
523	*/
524	if (conn->broker) {
525	crError("There shouldn't be any brokered connections in VirtualBox");
526	}
527
528	addr_length = sizeof( addr );
529	conn->tcp_socket = accept( cr_tcpip.server_sock, (struct sockaddr *) &addr, &addr_length );
530	if (conn->tcp_socket == -1)
531	{
532	err = crTCPIPErrno( );
533	crError( "Couldn't accept client: %s", crTCPIPErrorString( err ) );
534	}
535
536	if (SocketCreateCallback) {
537	SocketCreateCallback(CR_SOCKET_CREATE, conn->tcp_socket);
538	}
539
540	#ifndef ADDRINFO
541	sin_addr = ((struct sockaddr_in *) &addr)->sin_addr;
542	host = gethostbyaddr( (char *) &sin_addr, sizeof( sin_addr), AF_INET );
543	if (host == NULL )
544	{
545	char *temp = inet_ntoa( sin_addr );
546	conn->hostname = crStrdup( temp );
547	}
548	#else
549	err = getnameinfo ( (struct sockaddr *) &addr, addr_length,
550	host, sizeof( host),
551	NULL, 0, NI_NAMEREQD);
552	if ( err )
553	{
554	err = getnameinfo ( (struct sockaddr *) &addr, addr_length,
555	host, sizeof( host),
556	NULL, 0, NI_NUMERICHOST);
557	if ( err ) /* shouldn't ever happen */
558	conn->hostname = crStrdup("unknown ?!");
559	else
560	conn->hostname = crStrdup( host );
561	}
562	#endif
563	else
564	{
565	char *temp;
566	#ifndef ADDRINFO
567	conn->hostname = crStrdup( host->h_name );
568	#else
569	conn->hostname = crStrdup( host );
570	#endif
571
572	temp = conn->hostname;
573	while (temp && temp != '.' )
574	temp++;
575	*temp = '\0';
576	}
577
578	#ifdef RECV_BAIL_OUT
579	err = sizeof(unsigned int);
580	if ( getsockopt( conn->tcp_socket, SOL_SOCKET, SO_RCVBUF,
581	(char *) &conn->krecv_buf_size, &err ) )
582	{
583	conn->krecv_buf_size = 0;
584	}
585	#endif
586
587	crDebug( "Accepted connection from \"%s\".", conn->hostname );
588	}
589
590
591	void *
592	crTCPIPAlloc( CRConnection *conn )
593	{
594	CRTCPIPBuffer *buf;
595
596	#ifdef CHROMIUM_THREADSAFE
597	crLockMutex(&cr_tcpip.mutex);
598	#endif
599
600	buf = (CRTCPIPBuffer *) crBufferPoolPop( cr_tcpip.bufpool, conn->buffer_size );
601
602	if ( buf == NULL )
603	{
604	crDebug("Buffer pool %p was empty; allocated new %d byte buffer.",
605	cr_tcpip.bufpool,
606	(unsigned int)sizeof(CRTCPIPBuffer) + conn->buffer_size);
607	buf = (CRTCPIPBuffer *)
608	crAlloc( sizeof(CRTCPIPBuffer) + conn->buffer_size );
609	buf->magic = CR_TCPIP_BUFFER_MAGIC;
610	buf->kind = CRTCPIPMemory;
611	buf->pad = 0;
612	buf->allocated = conn->buffer_size;
613	}
614
615	#ifdef CHROMIUM_THREADSAFE
616	crUnlockMutex(&cr_tcpip.mutex);
617	#endif
618
619	return (void *)( buf + 1 );
620	}
621
622
623	static void
624	crTCPIPSingleRecv( CRConnection conn, void buf, unsigned int len )
625	{
626	crTCPIPReadExact( conn, buf, len );
627	}
628
629
630	static void
631	crTCPIPSend( CRConnection conn, void *bufp,
632	const void *start, unsigned int len )
633	{
634	if ( !conn \|\| conn->type == CR_NO_CONNECTION )
635	return;
636
637	if (!bufp) {
638	/* We're sending a user-allocated buffer.
639	* Simply write the length & the payload and return.
640	*/
641	const int sendable_len = conn->swap ? SWAP32(len) : len;
642	crTCPIPWriteExact( conn, &sendable_len, sizeof(len) );
643	if (conn->type == CR_NO_CONNECTION)
644	return;
645	crTCPIPWriteExact( conn, start, len );
646	}
647	else {
648	/* The region [start .. start + len + 1] lies within a buffer that
649	* was allocated with crTCPIPAlloc() and can be put into the free
650	* buffer pool when we're done sending it.
651	*/
652	CRTCPIPBuffer *tcpip_buffer;
653	unsigned int *lenp;
654
655	tcpip_buffer = (CRTCPIPBuffer )(bufp) - 1;
656
657	CRASSERT( tcpip_buffer->magic == CR_TCPIP_BUFFER_MAGIC );
658
659	/* All of the buffers passed to the send function were allocated
660	* with crTCPIPAlloc(), which includes a header with a 4 byte
661	* pad field, to insure that we always have a place to write
662	* the length field, even when start == *bufp.
663	*/
664	lenp = (unsigned int *) start - 1;
665	*lenp = conn->swap ? SWAP32(len) : len;
666
667	crTCPIPWriteExact(conn, lenp, len + sizeof(unsigned int));
668
669	/* Reclaim this pointer for reuse */
670	#ifdef CHROMIUM_THREADSAFE
671	crLockMutex(&cr_tcpip.mutex);
672	#endif
673	crBufferPoolPush(cr_tcpip.bufpool, tcpip_buffer, tcpip_buffer->allocated);
674	#ifdef CHROMIUM_THREADSAFE
675	crUnlockMutex(&cr_tcpip.mutex);
676	#endif
677	/* Since the buffer's now in the 'free' buffer pool, the caller can't
678	* use it any more. Setting bufp to NULL will make sure the caller
679	* doesn't try to re-use the buffer.
680	*/
681	*bufp = NULL;
682	}
683	}
684
685
686	void
687	__tcpip_dead_connection( CRConnection *conn )
688	{
689	crDebug( "Dead connection (sock=%d, host=%s), removing from pool",
690	conn->tcp_socket, conn->hostname );
691	/* remove from connection pool */
692	crTCPIPDoDisconnect( conn );
693	}
694
695
696	int
697	__crSelect( int n, fd_set *readfds, int sec, int usec )
698	{
699	for ( ; ; )
700	{
701	int err, num_ready;
702
703	if (sec \|\| usec)
704	{
705	/* We re-init everytime for Linux, as it corrupts
706	* the timeout structure, but other OS's
707	* don't have a problem with it.
708	*/
709	struct timeval timeout;
710	timeout.tv_sec = sec;
711	timeout.tv_usec = usec;
712	num_ready = select( n, readfds, NULL, NULL, &timeout );
713	}
714	else
715	num_ready = select( n, readfds, NULL, NULL, NULL );
716
717	if ( num_ready >= 0 )
718	{
719	return num_ready;
720	}
721
722	err = crTCPIPErrno( );
723	if ( err == EINTR )
724	{
725	crWarning( "select interrupted by an unblocked signal, trying again" );
726	}
727	else
728	{
729	crError( "select failed: %s", crTCPIPErrorString( err ) );
730	}
731	}
732	}
733
734
735	void
736	crTCPIPFree( CRConnection conn, void buf )
737	{
738	CRTCPIPBuffer tcpip_buffer = (CRTCPIPBuffer ) buf - 1;
739
740	CRASSERT( tcpip_buffer->magic == CR_TCPIP_BUFFER_MAGIC );
741	conn->recv_credits += tcpip_buffer->len;
742
743	switch ( tcpip_buffer->kind )
744	{
745	case CRTCPIPMemory:
746	#ifdef CHROMIUM_THREADSAFE
747	crLockMutex(&cr_tcpip.mutex);
748	#endif
749	if (cr_tcpip.bufpool) {
750	/* pool may have been deallocated just a bit earlier in response
751	* to a SIGPIPE (Broken Pipe) signal.
752	*/
753	crBufferPoolPush( cr_tcpip.bufpool, tcpip_buffer, tcpip_buffer->allocated );
754	}
755	#ifdef CHROMIUM_THREADSAFE
756	crUnlockMutex(&cr_tcpip.mutex);
757	#endif
758	break;
759
760	case CRTCPIPMemoryBig:
761	crFree( tcpip_buffer );
762	break;
763
764	default:
765	crError( "Weird buffer kind trying to free in crTCPIPFree: %d", tcpip_buffer->kind );
766	}
767	}
768
769
770	/**
771	* Check if message type is GATHER. If so, process it specially.
772	* \return number of bytes which were consumed
773	*/
774	static int
775	crTCPIPUserbufRecv(CRConnection conn, CRMessage msg)
776	{
777	if (msg->header.type == CR_MESSAGE_GATHER) {
778	/* grab the offset and the length */
779	const int len = 2 * sizeof(unsigned int); /* was unsigned long!!!! */
780	unsigned int buf[2];
781
782	if (__tcpip_read_exact(conn->tcp_socket, buf, len) <= 0)
783	{
784	__tcpip_dead_connection( conn );
785	}
786	msg->gather.offset = buf[0];
787	msg->gather.len = buf[1];
788
789	/* read the rest into the userbuf */
790	if (buf[0] + buf[1] > (unsigned int) conn->userbuf_len)
791	{
792	crDebug("userbuf for Gather Message is too small!");
793	return len;
794	}
795
796	if (__tcpip_read_exact(conn->tcp_socket,
797	conn->userbuf + buf[0], buf[1]) <= 0)
798	{
799	__tcpip_dead_connection( conn );
800	}
801	return len + buf[1];
802	}
803	else {
804	return 0;
805	}
806	}
807
808
809	/**
810	* Receive the next message on the given connection.
811	* If we're being called by crTCPIPRecv(), we already know there's
812	* something to receive.
813	*/
814	static void
815	crTCPIPReceiveMessage(CRConnection *conn)
816	{
817	CRMessage *msg;
818	CRMessageType cached_type;
819	CRTCPIPBuffer *tcpip_buffer;
820	unsigned int len, total, leftover;
821	const int sock = conn->tcp_socket;
822
823	/* Our gigE board is acting odd. If we recv() an amount
824	* less than what is already in the RECVBUF, performance
825	* goes into the toilet (somewhere around a factor of 3).
826	* This is an ugly hack, but seems to get around whatever
827	* funk is being produced
828	*
829	* Remember to set your kernel recv buffers to be bigger
830	* than the framebuffer 'chunk' you are sending (see
831	* sysctl -a \| grep rmem) , or this will really have no
832	* effect. --karl
833	*/
834	#ifdef RECV_BAIL_OUT
835	{
836	int inbuf;
837	(void) recv(sock, &len, sizeof(len), MSG_PEEK);
838	ioctl(conn->tcp_socket, FIONREAD, &inbuf);
839
840	if ((conn->krecv_buf_size > len) && (inbuf < len))
841	return;
842	}
843	#endif
844
845	/* this reads the length of the message */
846	if ( __tcpip_read_exact( sock, &len, sizeof(len)) <= 0 )
847	{
848	__tcpip_dead_connection( conn );
849	return;
850	}
851
852	if (conn->swap)
853	len = SWAP32(len);
854
855	CRASSERT( len > 0 );
856
857	if ( len <= conn->buffer_size )
858	{
859	/* put in pre-allocated buffer */
860	tcpip_buffer = (CRTCPIPBuffer *) crTCPIPAlloc( conn ) - 1;
861	}
862	else
863	{
864	/* allocate new buffer */
865	tcpip_buffer = (CRTCPIPBuffer ) crAlloc( sizeof(tcpip_buffer) + len );
866	tcpip_buffer->magic = CR_TCPIP_BUFFER_MAGIC;
867	tcpip_buffer->kind = CRTCPIPMemoryBig;
868	tcpip_buffer->pad = 0;
869	}
870
871	tcpip_buffer->len = len;
872
873	/* if we have set a userbuf, and there is room in it, we probably
874	* want to stick the message into that, instead of our allocated
875	* buffer.
876	*/
877	leftover = 0;
878	total = len;
879	if ((conn->userbuf != NULL)
880	&& (conn->userbuf_len >= (int) sizeof(CRMessageHeader)))
881	{
882	leftover = len - sizeof(CRMessageHeader);
883	total = sizeof(CRMessageHeader);
884	}
885
886	if ( __tcpip_read_exact( sock, tcpip_buffer + 1, total) <= 0 )
887	{
888	crWarning( "Bad juju: %d %d on socket 0x%x", tcpip_buffer->allocated,
889	total, sock );
890	crFree( tcpip_buffer );
891	__tcpip_dead_connection( conn );
892	return;
893	}
894
895	conn->recv_credits -= total;
896	conn->total_bytes_recv += total;
897
898	msg = (CRMessage *) (tcpip_buffer + 1);
899	cached_type = msg->header.type;
900	if (conn->swap)
901	{
902	msg->header.type = (CRMessageType) SWAP32( msg->header.type );
903	msg->header.conn_id = (CRMessageType) SWAP32( msg->header.conn_id );
904	}
905
906	/* if there is still data pending, it should go into the user buffer */
907	if (leftover)
908	{
909	const unsigned int handled = crTCPIPUserbufRecv(conn, msg);
910
911	/* if there is anything left, plop it into the recv_buffer */
912	if (leftover - handled)
913	{
914	if ( __tcpip_read_exact( sock, tcpip_buffer + 1 + total, leftover-handled) <= 0 )
915	{
916	crWarning( "Bad juju: %d %d", tcpip_buffer->allocated, leftover-handled);
917	crFree( tcpip_buffer );
918	__tcpip_dead_connection( conn );
919	return;
920	}
921	}
922
923	conn->recv_credits -= handled;
924	conn->total_bytes_recv += handled;
925	}
926
927	crNetDispatchMessage( cr_tcpip.recv_list, conn, msg, len );
928	#if 0
929	crLogRead( len );
930	#endif
931
932	/* CR_MESSAGE_OPCODES is freed in crserverlib/server_stream.c with crNetFree.
933	* OOB messages are the programmer's problem. -- Humper 12/17/01
934	*/
935	if (cached_type != CR_MESSAGE_OPCODES
936	&& cached_type != CR_MESSAGE_OOB
937	&& cached_type != CR_MESSAGE_GATHER)
938	{
939	crTCPIPFree( conn, tcpip_buffer + 1 );
940	}
941	}
942
943
944	/**
945	* Loop over all TCP/IP connections, reading incoming data on those
946	* that are ready.
947	*/
948	int
949	crTCPIPRecv( void )
950	{
951	/* ensure we don't get caught with a new thread connecting */
952	const int num_conns = cr_tcpip.num_conns;
953	int num_ready, max_fd, i;
954	fd_set read_fds;
955	int msock = -1; /* assumed mothership socket */
956	#if CRAPPFAKER_SHOULD_DIE
957	int none_left = 1;
958	#endif
959
960	#ifdef CHROMIUM_THREADSAFE
961	crLockMutex(&cr_tcpip.recvmutex);
962	#endif
963
964	/*
965	* Loop over all connections and determine which are TCP/IP connections
966	* that are ready to be read.
967	*/
968	max_fd = 0;
969	FD_ZERO( &read_fds );
970	for ( i = 0; i < num_conns; i++ )
971	{
972	CRConnection *conn = cr_tcpip.conns[i];
973	if ( !conn \|\| conn->type == CR_NO_CONNECTION )
974	continue;
975
976	#if CRAPPFAKER_SHOULD_DIE
977	none_left = 0;
978	#endif
979
980	if ( conn->recv_credits > 0 \|\| conn->type != CR_TCPIP )
981	{
982	/*
983	* NOTE: may want to always put the FD in the descriptor
984	* set so we'll notice broken connections. Down in the
985	* loop that iterates over the ready sockets only peek
986	* (MSG_PEEK flag to recv()?) if the connection isn't
987	* enabled.
988	*/
989	#if 0 /* not used - see below */
990	#ifndef ADDRINFO
991	struct sockaddr s;
992	#else
993	struct sockaddr_storage s;
994	#endif
995	socklen_t slen;
996	#endif
997	fd_set only_fd; /* testing single fd */
998	CRSocket sock = conn->tcp_socket;
999
1000	if ( (int) sock + 1 > max_fd )
1001	max_fd = (int) sock + 1;
1002	FD_SET( sock, &read_fds );
1003
1004	/* KLUDGE CITY......
1005	*
1006	* With threads there's a race condition between
1007	* TCPIPRecv and TCPIPSingleRecv when new
1008	* clients are connecting, thus new mothership
1009	* connections are also being established.
1010	* This code below is to check that we're not
1011	* in a state of accepting the socket without
1012	* connecting to it otherwise we fail with
1013	* ENOTCONN later. But, this is really a side
1014	* effect of this routine catching a motherships
1015	* socket connection and reading data that wasn't
1016	* really meant for us. It was really meant for
1017	* TCPIPSingleRecv. So, if we detect an
1018	* in-progress connection we set the msock id
1019	* so that we can assume the motherships socket
1020	* and skip over them.
1021	*/
1022
1023	FD_ZERO(&only_fd);
1024	FD_SET( sock, &only_fd );
1025
1026	#if 0 /* Disabled on Dec 13 2005 by BrianP - seems to cause trouble */
1027	slen = sizeof( s );
1028	/* Check that the socket is REALLY connected */
1029	/* Doesn't this call introduce some inefficiency??? (BP) */
1030	if (getpeername(sock, (struct sockaddr *) &s, &slen) < 0) {
1031	/* Another kludge.....
1032	* If we disconnect a socket without writing
1033	* anything to it, we end up here. Detect
1034	* the disconnected socket by checking if
1035	* we've ever sent something and then
1036	* disconnect it.
1037	*
1038	* I think the networking layer needs
1039	* a bit of a re-write.... Alan.
1040	*/
1041	if (conn->total_bytes_sent > 0) {
1042	crTCPIPDoDisconnect( conn );
1043	}
1044	FD_CLR(sock, &read_fds);
1045	msock = sock;
1046	}
1047	#endif
1048	/*
1049	* Nope, that last socket we've just caught in
1050	* the connecting phase. We've probably found
1051	* a mothership connection here, and we shouldn't
1052	* process it
1053	*/
1054	if ((int)sock == msock+1)
1055	FD_CLR(sock, &read_fds);
1056	}
1057	}
1058
1059	#if CRAPPFAKER_SHOULD_DIE
1060	if (none_left) {
1061	/*
1062	* Caught no more connections.
1063	* Review this if we want to try
1064	* restarting crserver's dynamically.
1065	*/
1066	#ifdef CHROMIUM_THREADSAFE
1067	crUnlockMutex(&cr_tcpip.recvmutex);
1068	#endif
1069	crError("No more connections to process, terminating...\n");
1070	exit(0); /* shouldn't get here */
1071	}
1072	#endif
1073
1074	if (!max_fd) {
1075	#ifdef CHROMIUM_THREADSAFE
1076	crUnlockMutex(&cr_tcpip.recvmutex);
1077	#endif
1078	return 0;
1079	}
1080
1081	if ( num_conns ) {
1082	num_ready = __crSelect( max_fd, &read_fds, 0, 500 );
1083	}
1084	else {
1085	crWarning( "Waiting for first connection..." );
1086	num_ready = __crSelect( max_fd, &read_fds, 0, 0 );
1087	}
1088
1089	if ( num_ready == 0 ) {
1090	#ifdef CHROMIUM_THREADSAFE
1091	crUnlockMutex(&cr_tcpip.recvmutex);
1092	#endif
1093	return 0;
1094	}
1095
1096	/*
1097	* Loop over connections, receive data on the TCP/IP connections that
1098	* we determined are ready above.
1099	*/
1100	for ( i = 0; i < num_conns; i++ )
1101	{
1102	CRConnection *conn = cr_tcpip.conns[i];
1103	CRSocket sock;
1104
1105	if ( !conn \|\| conn->type == CR_NO_CONNECTION )
1106	continue;
1107
1108	/* Added by Samuel Thibault during TCP/IP / UDP code factorization */
1109	if ( conn->type != CR_TCPIP )
1110	continue;
1111
1112	sock = conn->tcp_socket;
1113	if ( !FD_ISSET( sock, &read_fds ) )
1114	continue;
1115
1116	if (conn->threaded)
1117	continue;
1118
1119	crTCPIPReceiveMessage(conn);
1120	}
1121
1122	#ifdef CHROMIUM_THREADSAFE
1123	crUnlockMutex(&cr_tcpip.recvmutex);
1124	#endif
1125
1126	return 1;
1127	}
1128
1129
1130	static void
1131	crTCPIPHandleNewMessage( CRConnection conn, CRMessage msg, unsigned int len )
1132	{
1133	CRTCPIPBuffer buf = ((CRTCPIPBuffer ) msg) - 1;
1134
1135	/* build a header so we can delete the message later */
1136	buf->magic = CR_TCPIP_BUFFER_MAGIC;
1137	buf->kind = CRTCPIPMemory;
1138	buf->len = len;
1139	buf->pad = 0;
1140
1141	crNetDispatchMessage( cr_tcpip.recv_list, conn, msg, len );
1142	}
1143
1144
1145	static void
1146	crTCPIPInstantReclaim( CRConnection conn, CRMessage mess )
1147	{
1148	crTCPIPFree( conn, mess );
1149	}
1150
1151
1152	void
1153	crTCPIPInit( CRNetReceiveFuncList rfl, CRNetCloseFuncList cfl,
1154	unsigned int mtu )
1155	{
1156	(void) mtu;
1157
1158	cr_tcpip.recv_list = rfl;
1159	cr_tcpip.close_list = cfl;
1160	if ( cr_tcpip.initialized )
1161	{
1162	return;
1163	}
1164
1165	cr_tcpip.initialized = 1;
1166
1167	cr_tcpip.num_conns = 0;
1168	cr_tcpip.conns = NULL;
1169
1170	cr_tcpip.server_sock = -1;
1171
1172	#ifdef CHROMIUM_THREADSAFE
1173	crInitMutex(&cr_tcpip.mutex);
1174	crInitMutex(&cr_tcpip.recvmutex);
1175	#endif
1176	cr_tcpip.bufpool = crBufferPoolInit(16);
1177	}
1178
1179
1180	/**
1181	* The function that actually connects. This should only be called by clients
1182	* Servers have another way to set up the socket.
1183	*/
1184	int
1185	crTCPIPDoConnect( CRConnection *conn )
1186	{
1187	int err;
1188	#ifndef ADDRINFO
1189	struct sockaddr_in servaddr;
1190	struct hostent *hp;
1191	int i;
1192
1193	conn->tcp_socket = socket( AF_INET, SOCK_STREAM, 0 );
1194	if ( conn->tcp_socket < 0 )
1195	{
1196	int err = crTCPIPErrno( );
1197	crWarning( "socket error: %s", crTCPIPErrorString( err ) );
1198	cr_tcpip.conns[conn->index] = NULL; /* remove from table */
1199	return 0;
1200	}
1201
1202	if (SocketCreateCallback) {
1203	SocketCreateCallback(CR_SOCKET_CREATE, conn->tcp_socket);
1204	}
1205
1206	/* Set up the socket the way we want. */
1207	spankSocket( conn->tcp_socket );
1208
1209	/* Standard Berkeley sockets mumbo jumbo */
1210	hp = gethostbyname( conn->hostname );
1211	if ( !hp )
1212	{
1213	crWarning( "Unknown host: \"%s\"", conn->hostname );
1214	cr_tcpip.conns[conn->index] = NULL; /* remove from table */
1215	return 0;
1216	}
1217
1218	crMemset( &servaddr, 0, sizeof(servaddr) );
1219	servaddr.sin_family = AF_INET;
1220	servaddr.sin_port = htons( (short) conn->port );
1221
1222	crMemcpy((char *) &servaddr.sin_addr, hp->h_addr, sizeof(servaddr.sin_addr));
1223	#else
1224	char port_s[NI_MAXSERV];
1225	struct addrinfo res,cur;
1226	struct addrinfo hints;
1227
1228	sprintf(port_s, "%u", (short unsigned) conn->port);
1229
1230	crMemset(&hints, 0, sizeof(hints));
1231	hints.ai_family = PF;
1232	hints.ai_socktype = SOCK_STREAM;
1233
1234	err = getaddrinfo( conn->hostname, port_s, &hints, &res);
1235	if ( err )
1236	{
1237	crWarning( "Unknown host: \"%s\": %s", conn->hostname, gai_strerror(err) );
1238	cr_tcpip.conns[conn->index] = NULL; /* remove from table */
1239	return 0;
1240	}
1241	#endif
1242
1243	/* If brokered, we'll contact the mothership to broker the network
1244	* connection. We'll send the mothership our hostname, the port and
1245	* our endianness and will get in return a connection ID number.
1246	*/
1247	if (conn->broker)
1248	{
1249	crError("There shouldn't be any brokered connections in VirtualBox");
1250	}
1251
1252	#ifndef ADDRINFO
1253	for (i=1;i;)
1254	#else
1255	for (cur=res;cur;)
1256	#endif
1257	{
1258	#ifndef ADDRINFO
1259
1260	#ifdef RECV_BAIL_OUT
1261	err = sizeof(unsigned int);
1262	if ( getsockopt( conn->tcp_socket, SOL_SOCKET, SO_RCVBUF,
1263	(char *) &conn->krecv_buf_size, &err ) )
1264	{
1265	conn->krecv_buf_size = 0;
1266	}
1267	#endif
1268	if ( !connect( conn->tcp_socket, (struct sockaddr *) &servaddr,
1269	sizeof(servaddr) ) )
1270	return 1;
1271	#else
1272
1273	conn->tcp_socket = socket( cur->ai_family, cur->ai_socktype, cur->ai_protocol );
1274	if ( conn->tcp_socket < 0 )
1275	{
1276	int err = crTCPIPErrno( );
1277	if (err != EAFNOSUPPORT)
1278	crWarning( "socket error: %s, trying another way", crTCPIPErrorString( err ) );
1279	cur=cur->ai_next;
1280	continue;
1281	}
1282
1283	if (SocketCreateCallback) {
1284	SocketCreateCallback(CR_SOCKET_CREATE, conn->tcp_socket);
1285	}
1286
1287	err = 1;
1288	setsockopt(conn->tcp_socket, SOL_SOCKET, SO_REUSEADDR, &err, sizeof(int));
1289
1290	/* Set up the socket the way we want. */
1291	spankSocket( conn->tcp_socket );
1292
1293	#if RECV_BAIL_OUT
1294	err = sizeof(unsigned int);
1295	if ( getsockopt( conn->tcp_socket, SOL_SOCKET, SO_RCVBUF,
1296	(char *) &conn->krecv_buf_size, &err ) )
1297	{
1298	conn->krecv_buf_size = 0;
1299	}
1300	#endif
1301
1302	if ( !connect( conn->tcp_socket, cur->ai_addr, cur->ai_addrlen ) ) {
1303	freeaddrinfo(res);
1304	return 1;
1305	}
1306	#endif
1307
1308	err = crTCPIPErrno( );
1309	if ( err == EADDRINUSE \|\| err == ECONNREFUSED )
1310	crWarning( "Connection refused to %s:%d, %s",
1311	conn->hostname, conn->port, crTCPIPErrorString( err ) );
1312
1313	else if ( err == EINTR )
1314	{
1315	crWarning( "connection to %s:%d "
1316	"interrupted, trying again", conn->hostname, conn->port );
1317	continue;
1318	}
1319	else
1320	crWarning( "Couldn't connect to %s:%d, %s",
1321	conn->hostname, conn->port, crTCPIPErrorString( err ) );
1322	crCloseSocket( conn->tcp_socket );
1323	#ifndef ADDRINFO
1324	i=0;
1325	#else
1326	cur=cur->ai_next;
1327	#endif
1328	}
1329	#ifdef ADDRINFO
1330	freeaddrinfo(res);
1331	crWarning( "Couldn't find any suitable way to connect to %s", conn->hostname );
1332	#endif
1333	cr_tcpip.conns[conn->index] = NULL; /* remove from table */
1334	return 0;
1335	}
1336
1337
1338	/**
1339	* Disconnect this connection, but don't free(conn).
1340	*/
1341	void
1342	crTCPIPDoDisconnect( CRConnection *conn )
1343	{
1344	int num_conns = cr_tcpip.num_conns;
1345	int none_left = 1;
1346	int i;
1347
1348	/* If this connection has already been disconnected (e.g.
1349	* if the connection has been lost and disabled through
1350	* a call to __tcpip_dead_connection(), which will then
1351	* call this routine), don't disconnect it again; if we
1352	* do, and if a new valid connection appears in the same
1353	* slot (conn->index), we'll effectively disable the
1354	* valid connection by mistake, leaving us unable to
1355	* receive inbound data on that connection.
1356	*/
1357	if (conn->type == CR_NO_CONNECTION) return;
1358
1359	crCloseSocket( conn->tcp_socket );
1360	if (conn->hostname) {
1361	crFree(conn->hostname);
1362	conn->hostname = NULL;
1363	}
1364	conn->tcp_socket = 0;
1365	conn->type = CR_NO_CONNECTION;
1366	cr_tcpip.conns[conn->index] = NULL;
1367
1368	/* see if any connections remain */
1369	for (i = 0; i < num_conns; i++)
1370	{
1371	if ( cr_tcpip.conns[i] && cr_tcpip.conns[i]->type != CR_NO_CONNECTION )
1372	none_left = 0; /* found a live connection */
1373	}
1374
1375	#if 0 /* disabled on 13 Dec 2005 by BrianP - this prevents future client
1376	* connections after the last one goes away.
1377	*/
1378	if (none_left && cr_tcpip.server_sock != -1)
1379	{
1380	crDebug("Closing master socket (probably quitting).");
1381	crCloseSocket( cr_tcpip.server_sock );
1382	cr_tcpip.server_sock = -1;
1383	#ifdef CHROMIUM_THREADSAFE
1384	crFreeMutex(&cr_tcpip.mutex);
1385	crFreeMutex(&cr_tcpip.recvmutex);
1386	#endif
1387	crBufferPoolFree( cr_tcpip.bufpool );
1388	cr_tcpip.bufpool = NULL;
1389	last_port = 0;
1390	cr_tcpip.initialized = 0;
1391	}
1392	#endif
1393	}
1394
1395
1396	/**
1397	* Initialize a CRConnection for tcp/ip. This is called via the
1398	* InitConnection() function (and from the UDP module).
1399	*/
1400	void
1401	crTCPIPConnection( CRConnection *conn )
1402	{
1403	int i, found = 0;
1404	int n_bytes;
1405
1406	CRASSERT( cr_tcpip.initialized );
1407
1408	conn->type = CR_TCPIP;
1409	conn->Alloc = crTCPIPAlloc;
1410	conn->Send = crTCPIPSend;
1411	conn->SendExact = crTCPIPWriteExact;
1412	conn->Recv = crTCPIPSingleRecv;
1413	conn->RecvMsg = crTCPIPReceiveMessage;
1414	conn->Free = crTCPIPFree;
1415	conn->Accept = crTCPIPAccept;
1416	conn->Connect = crTCPIPDoConnect;
1417	conn->Disconnect = crTCPIPDoDisconnect;
1418	conn->InstantReclaim = crTCPIPInstantReclaim;
1419	conn->HandleNewMessage = crTCPIPHandleNewMessage;
1420	conn->index = cr_tcpip.num_conns;
1421	conn->sizeof_buffer_header = sizeof( CRTCPIPBuffer );
1422	conn->actual_network = 1;
1423
1424	conn->krecv_buf_size = 0;
1425
1426	/* Find a free slot */
1427	for (i = 0; i < cr_tcpip.num_conns; i++) {
1428	if (cr_tcpip.conns[i] == NULL) {
1429	conn->index = i;
1430	cr_tcpip.conns[i] = conn;
1431	found = 1;
1432	break;
1433	}
1434	}
1435
1436	/* Realloc connection stack if we couldn't find a free slot */
1437	if (found == 0) {
1438	n_bytes = ( cr_tcpip.num_conns + 1 ) * sizeof(*cr_tcpip.conns);
1439	crRealloc( (void **) &cr_tcpip.conns, n_bytes );
1440	cr_tcpip.conns[cr_tcpip.num_conns++] = conn;
1441	}
1442	}
1443
1444
1445	int crGetHostname( char *buf, unsigned int len )
1446	{
1447	const char *override;
1448	int ret;
1449
1450	override = crGetenv("CR_HOSTNAME");
1451	if (override)
1452	{
1453	crStrncpy(buf, override, len);
1454	ret = 0;
1455	}
1456	else
1457	ret = gethostname( buf, len );
1458	return ret;
1459	}
1460
1461
1462	CRConnection** crTCPIPDump( int *num )
1463	{
1464	*num = cr_tcpip.num_conns;
1465
1466	return cr_tcpip.conns;
1467	}

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source: vbox/trunk/src/VBox/GuestHost/OpenGL/util/tcpip.c@ 62425

以其他格式下載: