1 /*****************************************************************************
2 * io.c: network I/O functions
3 *****************************************************************************
4 * Copyright (C) 2004-2005, 2007 the VideoLAN team
5 * Copyright © 2005-2006 Rémi Denis-Courmont
8 * Authors: Laurent Aimar <fenrir@videolan.org>
9 * Rémi Denis-Courmont <rem # videolan.org>
10 * Christophe Mutricy <xtophe at videolan dot org>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
43 #ifdef HAVE_SYS_TIME_H
44 # include <sys/time.h>
53 #include <vlc_network.h>
56 # define INADDR_ANY 0x00000000
59 # define INADDR_NONE 0xFFFFFFFF
62 #if defined(WIN32) || defined(UNDER_CE)
64 # define EAFNOSUPPORT WSAEAFNOSUPPORT
67 extern int rootwrap_bind (int family, int socktype, int protocol,
68 const struct sockaddr *addr, size_t alen);
70 int net_SetupSocket (int fd)
72 #if defined (WIN32) || defined (UNDER_CE)
73 ioctlsocket (fd, FIONBIO, &(unsigned long){ 1 });
75 fcntl (fd, F_SETFD, FD_CLOEXEC);
76 fcntl (fd, F_SETFL, fcntl (fd, F_GETFL, 0) | O_NONBLOCK);
79 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
84 int net_Socket (vlc_object_t *p_this, int family, int socktype,
87 int fd = socket (family, socktype, protocol);
90 if (net_errno != EAFNOSUPPORT)
91 msg_Err (p_this, "cannot create socket: %s",
92 net_strerror (net_errno));
100 * Accepts only IPv6 connections on IPv6 sockets
101 * (and open an IPv4 socket later as well if needed).
102 * Only Linux and FreeBSD can map IPv4 connections on IPv6 sockets,
103 * so this allows for more uniform handling across platforms. Besides,
104 * it makes sure that IPv4 addresses will be printed as w.x.y.z rather
105 * than ::ffff:w.x.y.z
107 if (family == AF_INET6)
108 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
111 #if defined (WIN32) || defined (UNDER_CE)
112 # ifndef IPV6_PROTECTION_LEVEL
113 # warning Please update your C library headers.
114 # define IPV6_PROTECTION_LEVEL 23
115 # define PROTECTION_LEVEL_UNRESTRICTED 10
117 if (family == AF_INET6)
118 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
119 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
126 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
127 int i_port, int family, int socktype, int protocol)
129 struct addrinfo hints, *res;
131 memset (&hints, 0, sizeof( hints ));
132 hints.ai_family = family;
133 hints.ai_socktype = socktype;
134 hints.ai_flags = AI_PASSIVE;
136 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
138 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
141 msg_Err (p_this, "Cannot resolve %s port %d : %s", psz_host, i_port,
142 vlc_gai_strerror (i_val));
149 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
151 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
152 protocol ?: ptr->ai_protocol);
155 msg_Dbg (p_this, "socket error: %s", net_strerror (net_errno));
159 /* Bind the socket */
160 #if defined (WIN32) || defined (UNDER_CE)
162 * Under Win32 and for multicasting, we bind to INADDR_ANY.
163 * This is of course a severe bug, since the socket would logically
164 * receive unicast traffic, and multicast traffic of groups subscribed
165 * to via other sockets.
167 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
168 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
170 // This works for IPv4 too - don't worry!
171 struct sockaddr_in6 dumb =
173 .sin6_family = ptr->ai_addr->sa_family,
174 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
177 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
181 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
183 int saved_errno = net_errno;
186 #if !defined(WIN32) && !defined(UNDER_CE)
187 fd = rootwrap_bind (ptr->ai_family, ptr->ai_socktype,
188 protocol ?: ptr->ai_protocol, ptr->ai_addr,
192 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
197 msg_Err (p_this, "socket bind error (%s)",
198 net_strerror( saved_errno ) );
203 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
205 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
213 switch (ptr->ai_socktype)
218 if (listen (fd, INT_MAX))
220 msg_Err (p_this, "socket listen error (%s)",
221 net_strerror (net_errno));
227 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
230 nsockv[sockc++] = fd;
237 vlc_freeaddrinfo (res);
246 int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
247 int family, int socktype, int protocol)
249 int *fdv = net_Listen (obj, host, port, family, socktype, protocol);
253 for (unsigned i = 1; fdv[i] != -1; i++)
255 msg_Warn (obj, "Multiple sockets opened. Dropping extra ones!");
268 /*****************************************************************************
270 *****************************************************************************
271 * Close a network handle
272 *****************************************************************************/
273 void net_Close (int fd)
276 CloseHandle ((HANDLE)fd);
277 #elif defined (WIN32)
286 net_ReadInner( vlc_object_t *restrict p_this, unsigned fdc, const int *fdv,
287 const v_socket_t *const *restrict vsv,
288 uint8_t *restrict p_buf, size_t i_buflen,
289 vlc_bool_t dontwait, vlc_bool_t waitall )
297 struct pollfd ufd[fdc];
299 int delay_ms = dontwait ? 0 : 500;
302 #if defined(WIN32) || defined(UNDER_CE)
303 WSASetLastError(WSAEINTR);
310 memset (ufd, 0, sizeof (ufd));
312 for( i = 0; i < fdc; i++ )
315 ufd[i].events = POLLIN;
318 n = poll( ufd, fdc, delay_ms );
322 assert ((unsigned)n <= fdc);
324 if (n == 0) // timeout
329 if ((i_total > 0) && (ufd[i].revents & POLLERR))
330 return i_total; // error will be dequeued on next run
332 if ((ufd[i].revents & POLLIN) == 0)
343 n = (*vsv)->pf_recv( (*vsv)->p_sys, p_buf, i_buflen );
347 #if defined(WIN32) || defined(UNDER_CE)
348 n = recv( *fdv, p_buf, i_buflen, 0 );
350 n = read( *fdv, p_buf, i_buflen );
356 #if defined(WIN32) || defined(UNDER_CE)
357 switch( WSAGetLastError() )
360 /* only happens with vs != NULL (SSL) - not really an error */
365 /* On Win32, recv() fails if the datagram doesn't fit inside
366 * the passed buffer, even though the buffer will be filled
367 * with the first part of the datagram. */
368 msg_Err( p_this, "Receive error: "
369 "Increase the mtu size (--mtu option)" );
377 if( errno == EAGAIN ) /* spurious wake-up (sucks if fdc > 1) */
390 if (dontwait || !waitall)
396 msg_Err( p_this, "Read error: %s", net_strerror (net_errno) );
397 return i_total ? (ssize_t)i_total : -1;
401 /*****************************************************************************
403 *****************************************************************************
404 * Read from a network socket
405 * If b_retry is true, then we repeat until we have read the right amount of
406 * data; in that case, a short count means EOF has been reached.
407 *****************************************************************************/
408 ssize_t __net_Read( vlc_object_t *restrict p_this, int fd,
409 const v_socket_t *restrict p_vs,
410 uint8_t *restrict buf, size_t len, vlc_bool_t b_retry )
412 return net_ReadInner( p_this, 1, &(int){ fd },
413 &(const v_socket_t *){ p_vs },
414 buf, len, VLC_FALSE, b_retry );
418 /*****************************************************************************
419 * __net_ReadNonBlock:
420 *****************************************************************************
421 * Read from a network socket, non blocking mode.
422 * This function should only be used after a poll() (or select(), but you
423 * should use poll instead of select()) invocation to avoid busy loops.
424 *****************************************************************************/
425 ssize_t __net_ReadNonBlock( vlc_object_t *restrict p_this, int fd,
426 const v_socket_t *restrict p_vs,
427 uint8_t *restrict buf, size_t len )
429 return net_ReadInner (p_this, 1, &(int){ fd },
430 &(const v_socket_t *){ p_vs },
431 buf, len, VLC_TRUE, VLC_FALSE);
435 /*****************************************************************************
437 *****************************************************************************
438 * Read from several sockets. Takes data from the first socket that has some.
439 *****************************************************************************/
440 ssize_t __net_Select( vlc_object_t *restrict p_this,
441 const int *restrict fds, int nfd,
442 uint8_t *restrict buf, size_t len )
444 const v_socket_t *vsv[nfd];
445 memset( vsv, 0, sizeof (vsv) );
447 return net_ReadInner( p_this, nfd, fds, vsv,
448 buf, len, VLC_FALSE, VLC_FALSE );
452 /* Write exact amount requested */
453 ssize_t __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
454 const uint8_t *p_data, size_t i_data )
463 struct pollfd ufd[1];
464 memset (ufd, 0, sizeof (ufd));
466 ufd[0].events = POLLOUT;
468 int val = poll (ufd, 1, 500);
472 msg_Err (p_this, "Write error: %s", net_strerror (net_errno));
479 if ((ufd[0].revents & POLLERR) && (i_total > 0))
480 return i_total; // error will be dequeued separately on next call
483 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
485 #if defined(WIN32) || defined(UNDER_CE)
486 val = send (fd, p_data, i_data, 0);
488 val = write (fd, p_data, i_data);
493 msg_Err (p_this, "Write error: %s", net_strerror (net_errno));
505 if ((i_total > 0) || (i_data == 0))
511 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
513 char *psz_line = NULL, *ptr = NULL;
514 size_t i_line = 0, i_max = 0;
519 if( i_line == i_max )
522 psz_line = realloc( psz_line, i_max );
523 ptr = psz_line + i_line;
526 if( net_Read( p_this, fd, p_vs, (uint8_t *)ptr, 1, VLC_TRUE ) != 1 )
545 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
551 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
552 const char *psz_fmt, ... )
556 va_start( args, psz_fmt );
557 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
563 ssize_t __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
564 const char *psz_fmt, va_list args )
569 i_size = vasprintf( &psz, psz_fmt, args );
570 i_ret = __net_Write( p_this, fd, p_vs, (uint8_t *)psz, i_size ) < i_size
578 /*****************************************************************************
579 * inet_pton replacement for obsolete and/or crap operating systems
580 *****************************************************************************/
581 #ifndef HAVE_INET_PTON
582 int inet_pton(int af, const char *src, void *dst)
585 /* As we already know, Microsoft always go its own way, so even if they do
586 * provide IPv6, they don't provide the API. */
587 struct sockaddr_storage addr;
588 int len = sizeof( addr );
590 /* Damn it, they didn't even put LPCSTR for the firs parameter!!! */
592 wchar_t *workaround_for_ill_designed_api =
593 malloc( MAX_PATH * sizeof(wchar_t) );
594 mbstowcs( workaround_for_ill_designed_api, src, MAX_PATH );
595 workaround_for_ill_designed_api[MAX_PATH-1] = 0;
597 char *workaround_for_ill_designed_api = strdup( src );
600 if( !WSAStringToAddress( workaround_for_ill_designed_api, af, NULL,
601 (LPSOCKADDR)&addr, &len ) )
603 free( workaround_for_ill_designed_api );
606 free( workaround_for_ill_designed_api );
611 memcpy( dst, &((struct sockaddr_in6 *)&addr)->sin6_addr, 16 );
615 memcpy( dst, &((struct sockaddr_in *)&addr)->sin_addr, 4 );
619 WSASetLastError( WSAEAFNOSUPPORT );
623 /* Assume IPv6 is not supported. */
624 /* Would be safer and more simpler to use inet_aton() but it is most
625 * likely not provided either. */
630 errno = EAFNOSUPPORT;
634 ipv4 = inet_addr( src );
635 if( ipv4 == INADDR_NONE )
638 memcpy( dst, &ipv4, 4 );
642 #endif /* HAVE_INET_PTON */
644 #ifndef HAVE_INET_NTOP
646 const char *inet_ntop(int af, const void * src,
647 char * dst, socklen_t cnt)
654 struct sockaddr_in6 addr;
655 memset(&addr, 0, sizeof(addr));
656 addr.sin6_family = AF_INET6;
657 addr.sin6_addr = *((struct in6_addr*)src);
658 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
659 sizeof(struct sockaddr_in6),
665 errno = WSAGetLastError();
673 struct sockaddr_in addr;
674 memset(&addr, 0, sizeof(addr));
675 addr.sin_family = AF_INET;
676 addr.sin_addr = *((struct in_addr*)src);
677 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
678 sizeof(struct sockaddr_in),
684 errno = WSAGetLastError();
689 errno = EAFNOSUPPORT;