1 /*****************************************************************************
2 * io.c: network I/O functions
3 *****************************************************************************
4 * Copyright (C) 2004-2005 the VideoLAN team
5 * Copyright © 2005-2006 Rémi Denis-Courmont
8 * Authors: Laurent Aimar <fenrir@videolan.org>
9 * Rémi Denis-Courmont <rem # videolan.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
42 #ifdef HAVE_SYS_TIME_H
43 # include <sys/time.h>
52 #include <vlc_network.h>
55 # define INADDR_ANY 0x00000000
58 # define INADDR_NONE 0xFFFFFFFF
61 #if defined(WIN32) || defined(UNDER_CE)
63 # define EAFNOSUPPORT WSAEAFNOSUPPORT
66 extern int rootwrap_bind (int family, int socktype, int protocol,
67 const struct sockaddr *addr, size_t alen);
69 int net_Socket (vlc_object_t *p_this, int family, int socktype,
72 int fd = socket (family, socktype, protocol);
75 if (net_errno != EAFNOSUPPORT)
76 msg_Err (p_this, "cannot create socket: %s",
77 net_strerror (net_errno));
81 #if defined (WIN32) || defined (UNDER_CE)
82 ioctlsocket (fd, FIONBIO, &(unsigned long){ 1 });
84 fcntl (fd, F_SETFD, FD_CLOEXEC);
85 fcntl (fd, F_SETFL, fcntl (fd, F_GETFL, 0) | O_NONBLOCK);
88 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
92 * Accepts only IPv6 connections on IPv6 sockets
93 * (and open an IPv4 socket later as well if needed).
94 * Only Linux and FreeBSD can map IPv4 connections on IPv6 sockets,
95 * so this allows for more uniform handling across platforms. Besides,
96 * it makes sure that IPv4 addresses will be printed as w.x.y.z rather
99 if (family == AF_INET6)
100 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
103 #if defined (WIN32) || defined (UNDER_CE)
104 # ifndef IPV6_PROTECTION_LEVEL
105 # warning Please update your C library headers.
106 # define IPV6_PROTECTION_LEVEL 23
107 # define PROTECTION_LEVEL_UNRESTRICTED 10
109 if (family == AF_INET6)
110 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
111 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
118 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
119 int i_port, int family, int socktype, int protocol)
121 struct addrinfo hints, *res;
123 memset (&hints, 0, sizeof( hints ));
124 hints.ai_family = family;
125 hints.ai_socktype = socktype;
126 hints.ai_flags = AI_PASSIVE;
128 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
130 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
133 msg_Err (p_this, "Cannot resolve %s port %d : %s", psz_host, i_port,
134 vlc_gai_strerror (i_val));
141 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
143 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
144 protocol ?: ptr->ai_protocol);
147 msg_Dbg (p_this, "socket error: %s", net_strerror (net_errno));
151 /* Bind the socket */
152 #if defined (WIN32) || defined (UNDER_CE)
154 * Under Win32 and for multicasting, we bind to INADDR_ANY.
155 * This is of course a severe bug, since the socket would logically
156 * receive unicast traffic, and multicast traffic of groups subscribed
157 * to via other sockets.
159 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
160 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
162 // This works for IPv4 too - don't worry!
163 struct sockaddr_in6 dumb =
165 .sin6_family = ptr->ai_addr->sa_family,
166 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
169 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
173 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
175 int saved_errno = net_errno;
178 #if !defined(WIN32) && !defined(UNDER_CE)
179 fd = rootwrap_bind (ptr->ai_family, ptr->ai_socktype,
180 protocol ?: ptr->ai_protocol, ptr->ai_addr,
184 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
189 msg_Err (p_this, "socket bind error (%s)",
190 net_strerror( saved_errno ) );
195 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
197 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
205 switch (ptr->ai_socktype)
210 if (listen (fd, INT_MAX))
212 msg_Err (p_this, "socket listen error (%s)",
213 net_strerror (net_errno));
219 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
222 nsockv[sockc++] = fd;
229 vlc_freeaddrinfo (res);
238 int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
239 int family, int socktype, int protocol)
241 int *fdv = net_Listen (obj, host, port, family, socktype, protocol);
245 for (unsigned i = 1; fdv[i] != -1; i++)
247 msg_Warn (obj, "Multiple sockets opened. Dropping extra ones!");
260 /*****************************************************************************
262 *****************************************************************************
263 * Close a network handle
264 *****************************************************************************/
265 void net_Close (int fd)
268 CloseHandle ((HANDLE)fd);
269 #elif defined (WIN32)
278 net_ReadInner( vlc_object_t *restrict p_this, unsigned fdc, const int *fdv,
279 const v_socket_t *const *restrict vsv,
280 uint8_t *restrict p_buf, size_t i_buflen,
281 int wait_ms, vlc_bool_t waitall )
290 struct pollfd ufd[fdc];
297 if ((wait_ms != -1) && (wait_ms < 500))
307 memset (ufd, 0, sizeof (ufd));
309 for( i = 0; i < fdc; i++ )
312 ufd[i].events = POLLIN;
315 n = poll( ufd, fdc, delay_ms );
319 for( i = 0; i < fdc; i++ )
321 #if !defined(WIN32) && !defined(UNDER_CE)
322 if( fdv[i] >= FD_SETSIZE )
324 /* We don't want to overflow select() fd_set */
325 msg_Err( p_this, "select set overflow" );
329 FD_SET( fdv[i], &set );
334 n = select( maxfd + 1, &set, NULL, NULL,
335 (wait_ms == -1) ? NULL
336 : &(struct timeval){ 0, delay_ms * 1000 } );
341 assert ((unsigned)n <= fdc);
343 if (n == 0) // timeout
349 if ((i_total > 0) && (ufd[i].revents & POLLERR))
350 return i_total; // error will be dequeued on next run
352 if ((ufd[i].revents & POLLIN) == 0)
354 if (!FD_ISSET (fdv[i], &set))
365 n = (*vsv)->pf_recv( (*vsv)->p_sys, p_buf, i_buflen );
369 #if defined(WIN32) || defined(UNDER_CE)
370 n = recv( *fdv, p_buf, i_buflen, 0 );
372 n = read( *fdv, p_buf, i_buflen );
378 #if defined(WIN32) || defined(UNDER_CE)
379 switch( WSAGetLastError() )
382 /* only happens with vs != NULL (SSL) - not really an error */
387 /* On Win32, recv() fails if the datagram doesn't fit inside
388 * the passed buffer, even though the buffer will be filled
389 * with the first part of the datagram. */
390 msg_Err( p_this, "Receive error: "
391 "Increase the mtu size (--mtu option)" );
396 if( errno == EAGAIN ) /* spurious wake-up (sucks if fdc > 1) */
416 return i_total; // time's up!
423 msg_Err( p_this, "Read error: %s", net_strerror (net_errno) );
424 return i_total ? (ssize_t)i_total : -1;
428 /*****************************************************************************
430 *****************************************************************************
431 * Read from a network socket
432 * If b_retry is true, then we repeat until we have read the right amount of
434 *****************************************************************************/
435 int __net_Read( vlc_object_t *restrict p_this, int fd,
436 const v_socket_t *restrict p_vs,
437 uint8_t *restrict p_data, int i_data, vlc_bool_t b_retry )
439 return net_ReadInner( p_this, 1, &(int){ fd },
440 &(const v_socket_t *){ p_vs },
441 p_data, i_data, -1, b_retry );
445 /*****************************************************************************
446 * __net_ReadNonBlock:
447 *****************************************************************************
448 * Read from a network socket, non blocking mode (with timeout)
449 *****************************************************************************/
450 int __net_ReadNonBlock( vlc_object_t *restrict p_this, int fd,
451 const v_socket_t *restrict p_vs,
452 uint8_t *restrict p_data, int i_data, mtime_t i_wait)
454 return net_ReadInner (p_this, 1, &(int){ fd },
455 &(const v_socket_t *){ p_vs },
456 p_data, i_data, i_wait / 1000, VLC_FALSE);
460 /*****************************************************************************
462 *****************************************************************************
463 * Read from several sockets (with timeout). Takes data from the first socket
465 *****************************************************************************/
466 int __net_Select( vlc_object_t *restrict p_this, const int *restrict pi_fd,
467 int i_fd, uint8_t *restrict p_data, int i_data,
470 const v_socket_t *vsv[i_fd];
471 memset( vsv, 0, sizeof (vsv) );
473 return net_ReadInner( p_this, i_fd, pi_fd, vsv, p_data, i_data,
474 i_wait / 1000, VLC_FALSE );
478 /* Write exact amount requested */
479 int __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
480 const uint8_t *p_data, int i_data )
490 struct pollfd ufd[1];
491 memset (ufd, 0, sizeof (ufd));
493 ufd[0].events = POLLOUT;
495 int val = poll (ufd, 1, 500);
496 if ((val > 0) && (ufd[0].revents & POLLERR) && (i_total > 0))
497 return i_total; // error will be dequeued separately on next call
502 #if !defined(WIN32) && !defined(UNDER_CE)
503 if (fd >= FD_SETSIZE)
505 /* We don't want to overflow select() fd_set */
506 msg_Err (p_this, "select set overflow");
512 int val = select (fd + 1, NULL, &set, NULL,
513 &(struct timeval){ 0, 500000 });
520 msg_Err (p_this, "Write error: %s",
521 net_strerror (net_errno));
522 return i_total ? (int)i_total : -1;
530 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
532 #if defined(WIN32) || defined(UNDER_CE)
533 val = send (fd, p_data, i_data, 0);
535 val = write (fd, p_data, i_data);
539 return i_total ? (int)i_total : -1;
551 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
553 char *psz_line = NULL, *ptr = NULL;
554 size_t i_line = 0, i_max = 0;
559 if( i_line == i_max )
562 psz_line = realloc( psz_line, i_max );
563 ptr = psz_line + i_line;
566 if( net_Read( p_this, fd, p_vs, (uint8_t *)ptr, 1, VLC_TRUE ) != 1 )
585 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
591 int net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
592 const char *psz_fmt, ... )
596 va_start( args, psz_fmt );
597 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
603 int __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
604 const char *psz_fmt, va_list args )
609 i_size = vasprintf( &psz, psz_fmt, args );
610 i_ret = __net_Write( p_this, fd, p_vs, (uint8_t *)psz, i_size ) < i_size
618 /*****************************************************************************
619 * inet_pton replacement for obsolete and/or crap operating systems
620 *****************************************************************************/
621 #ifndef HAVE_INET_PTON
622 int inet_pton(int af, const char *src, void *dst)
625 /* As we already know, Microsoft always go its own way, so even if they do
626 * provide IPv6, they don't provide the API. */
627 struct sockaddr_storage addr;
628 int len = sizeof( addr );
630 /* Damn it, they didn't even put LPCSTR for the firs parameter!!! */
632 wchar_t *workaround_for_ill_designed_api =
633 malloc( MAX_PATH * sizeof(wchar_t) );
634 mbstowcs( workaround_for_ill_designed_api, src, MAX_PATH );
635 workaround_for_ill_designed_api[MAX_PATH-1] = 0;
637 char *workaround_for_ill_designed_api = strdup( src );
640 if( !WSAStringToAddress( workaround_for_ill_designed_api, af, NULL,
641 (LPSOCKADDR)&addr, &len ) )
643 free( workaround_for_ill_designed_api );
646 free( workaround_for_ill_designed_api );
651 memcpy( dst, &((struct sockaddr_in6 *)&addr)->sin6_addr, 16 );
655 memcpy( dst, &((struct sockaddr_in *)&addr)->sin_addr, 4 );
659 WSASetLastError( WSAEAFNOSUPPORT );
663 /* Assume IPv6 is not supported. */
664 /* Would be safer and more simpler to use inet_aton() but it is most
665 * likely not provided either. */
670 errno = EAFNOSUPPORT;
674 ipv4 = inet_addr( src );
675 if( ipv4 == INADDR_NONE )
678 memcpy( dst, &ipv4, 4 );
682 #endif /* HAVE_INET_PTON */