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>
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_protocol = protocol;
127 hints.ai_flags = AI_PASSIVE;
129 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
131 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
134 msg_Err (p_this, "Cannot resolve %s port %d : %s", psz_host, i_port,
135 vlc_gai_strerror (i_val));
142 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
144 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
148 msg_Dbg (p_this, "socket error: %s", net_strerror (net_errno));
152 /* Bind the socket */
153 #if defined (WIN32) || defined (UNDER_CE)
155 * Under Win32 and for multicasting, we bind to INADDR_ANY.
156 * This is of course a severe bug, since the socket would logically
157 * receive unicast traffic, and multicast traffic of groups subscribed
158 * to via other sockets.
160 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
161 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
163 // This works for IPv4 too - don't worry!
164 struct sockaddr_in6 dumb =
166 .sin6_family = ptr->ai_addr->sa_family,
167 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
170 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
174 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
176 int saved_errno = net_errno;
179 #if !defined(WIN32) && !defined(UNDER_CE)
180 fd = rootwrap_bind (ptr->ai_family, ptr->ai_socktype,
181 ptr->ai_protocol, ptr->ai_addr,
185 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
190 msg_Err (p_this, "socket bind error (%s)",
191 net_strerror( saved_errno ) );
196 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
198 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
206 switch (ptr->ai_socktype)
211 if (listen (fd, INT_MAX))
213 msg_Err (p_this, "socket listen error (%s)",
214 net_strerror (net_errno));
220 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
223 nsockv[sockc++] = fd;
230 vlc_freeaddrinfo (res);
239 int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
240 int family, int socktype, int protocol)
242 int *fdv = net_Listen (obj, host, port, family, socktype, protocol);
246 for (unsigned i = 1; fdv[i] != -1; i++)
248 msg_Warn (obj, "A socket has been dropped!");
258 struct sockaddr_storage addr;
259 getsockname (fd, (struct sockaddr *)&addr,
260 &(socklen_t){ sizeof (addr) });
261 if ((addr.ss_family == AF_INET6)
262 && setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 0 },
265 msg_Err (obj, "Lame IP dual-stack: IPv4 connections might fail.");
274 /*****************************************************************************
276 *****************************************************************************
277 * Close a network handle
278 *****************************************************************************/
279 void net_Close (int fd)
282 CloseHandle ((HANDLE)fd);
283 #elif defined (WIN32)
292 net_ReadInner( vlc_object_t *restrict p_this, unsigned fdc, const int *fdv,
293 const v_socket_t *const *restrict vsv,
294 uint8_t *restrict p_buf, size_t i_buflen,
295 int wait_ms, vlc_bool_t waitall )
304 struct pollfd ufd[fdc];
311 if ((wait_ms != -1) && (wait_ms < 500))
321 memset (ufd, 0, sizeof (ufd));
323 for( i = 0; i < fdc; i++ )
326 ufd[i].events = POLLIN;
329 n = poll( ufd, fdc, delay_ms );
333 for( i = 0; i < fdc; i++ )
335 #if !defined(WIN32) && !defined(UNDER_CE)
336 if( fdv[i] >= FD_SETSIZE )
338 /* We don't want to overflow select() fd_set */
339 msg_Err( p_this, "select set overflow" );
343 FD_SET( fdv[i], &set );
348 n = select( maxfd + 1, &set, NULL, NULL,
349 (wait_ms == -1) ? NULL
350 : &(struct timeval){ 0, delay_ms * 1000 } );
355 assert ((unsigned)n <= fdc);
357 if (n == 0) // timeout
363 if ((i_total > 0) && (ufd[i].revents & POLLERR))
364 return i_total; // error will be dequeued on next run
366 if ((ufd[i].revents & POLLIN) == 0)
368 if (!FD_ISSET (fdv[i], &set))
379 n = (*vsv)->pf_recv( (*vsv)->p_sys, p_buf, i_buflen );
383 #if defined(WIN32) || defined(UNDER_CE)
384 n = recv( *fdv, p_buf, i_buflen, 0 );
386 n = read( *fdv, p_buf, i_buflen );
392 #if defined(WIN32) || defined(UNDER_CE)
393 switch( WSAGetLastError() )
396 /* only happens with vs != NULL (SSL) - not really an error */
401 /* On Win32, recv() fails if the datagram doesn't fit inside
402 * the passed buffer, even though the buffer will be filled
403 * with the first part of the datagram. */
404 msg_Err( p_this, "Receive error: "
405 "Increase the mtu size (--mtu option)" );
410 if( errno == EAGAIN ) /* spurious wake-up (sucks if fdc > 1) */
430 return i_total; // time's up!
437 msg_Err( p_this, "Read error: %s", net_strerror (net_errno) );
438 return i_total ? (ssize_t)i_total : -1;
442 /*****************************************************************************
444 *****************************************************************************
445 * Read from a network socket
446 * If b_retry is true, then we repeat until we have read the right amount of
448 *****************************************************************************/
449 int __net_Read( vlc_object_t *restrict p_this, int fd,
450 const v_socket_t *restrict p_vs,
451 uint8_t *restrict p_data, int i_data, vlc_bool_t b_retry )
453 return net_ReadInner( p_this, 1, &(int){ fd },
454 &(const v_socket_t *){ p_vs },
455 p_data, i_data, -1, b_retry );
459 /*****************************************************************************
460 * __net_ReadNonBlock:
461 *****************************************************************************
462 * Read from a network socket, non blocking mode (with timeout)
463 *****************************************************************************/
464 int __net_ReadNonBlock( vlc_object_t *restrict p_this, int fd,
465 const v_socket_t *restrict p_vs,
466 uint8_t *restrict p_data, int i_data, mtime_t i_wait)
468 return net_ReadInner (p_this, 1, &(int){ fd },
469 &(const v_socket_t *){ p_vs },
470 p_data, i_data, i_wait / 1000, VLC_FALSE);
474 /*****************************************************************************
476 *****************************************************************************
477 * Read from several sockets (with timeout). Takes data from the first socket
479 *****************************************************************************/
480 int __net_Select( vlc_object_t *restrict p_this, const int *restrict pi_fd,
481 const v_socket_t *const *restrict pp_vs,
482 int i_fd, uint8_t *restrict p_data, int i_data,
487 const v_socket_t *vsv[i_fd];
488 memset( vsv, 0, sizeof (vsv) );
490 return net_ReadInner( p_this, i_fd, pi_fd, vsv, p_data, i_data,
491 i_wait / 1000, VLC_FALSE );
494 return net_ReadInner( p_this, i_fd, pi_fd, pp_vs, p_data, i_data,
495 i_wait / 1000, VLC_FALSE );
499 /* Write exact amount requested */
500 int __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
501 const uint8_t *p_data, int i_data )
511 struct pollfd ufd[1];
512 memset (ufd, 0, sizeof (ufd));
514 ufd[0].events = POLLOUT;
516 int val = poll (ufd, 1, 500);
517 if ((val > 0) && (ufd[0].revents & POLLERR) && (i_total > 0))
518 return i_total; // error will be dequeued separately on next call
523 #if !defined(WIN32) && !defined(UNDER_CE)
524 if (fd >= FD_SETSIZE)
526 /* We don't want to overflow select() fd_set */
527 msg_Err (p_this, "select set overflow");
533 int val = select (fd + 1, NULL, &set, NULL,
534 &(struct timeval){ 0, 500000 });
541 msg_Err (p_this, "Write error: %s",
542 net_strerror (net_errno));
543 return i_total ? (int)i_total : -1;
551 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
553 #if defined(WIN32) || defined(UNDER_CE)
554 val = send (fd, p_data, i_data, 0);
556 val = write (fd, p_data, i_data);
560 return i_total ? (int)i_total : -1;
572 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
574 char *psz_line = NULL, *ptr = NULL;
575 size_t i_line = 0, i_max = 0;
580 if( i_line == i_max )
583 psz_line = realloc( psz_line, i_max );
584 ptr = psz_line + i_line;
587 if( net_Read( p_this, fd, p_vs, (uint8_t *)ptr, 1, VLC_TRUE ) != 1 )
606 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
612 int net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
613 const char *psz_fmt, ... )
617 va_start( args, psz_fmt );
618 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
624 int __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
625 const char *psz_fmt, va_list args )
630 i_size = vasprintf( &psz, psz_fmt, args );
631 i_ret = __net_Write( p_this, fd, p_vs, (uint8_t *)psz, i_size ) < i_size
639 /*****************************************************************************
640 * inet_pton replacement for obsolete and/or crap operating systems
641 *****************************************************************************/
642 #ifndef HAVE_INET_PTON
643 int inet_pton(int af, const char *src, void *dst)
646 /* As we already know, Microsoft always go its own way, so even if they do
647 * provide IPv6, they don't provide the API. */
648 struct sockaddr_storage addr;
649 int len = sizeof( addr );
651 /* Damn it, they didn't even put LPCSTR for the firs parameter!!! */
653 wchar_t *workaround_for_ill_designed_api =
654 malloc( MAX_PATH * sizeof(wchar_t) );
655 mbstowcs( workaround_for_ill_designed_api, src, MAX_PATH );
656 workaround_for_ill_designed_api[MAX_PATH-1] = 0;
658 char *workaround_for_ill_designed_api = strdup( src );
661 if( !WSAStringToAddress( workaround_for_ill_designed_api, af, NULL,
662 (LPSOCKADDR)&addr, &len ) )
664 free( workaround_for_ill_designed_api );
667 free( workaround_for_ill_designed_api );
672 memcpy( dst, &((struct sockaddr_in6 *)&addr)->sin6_addr, 16 );
676 memcpy( dst, &((struct sockaddr_in *)&addr)->sin_addr, 4 );
680 WSASetLastError( WSAEAFNOSUPPORT );
684 /* Assume IPv6 is not supported. */
685 /* Would be safer and more simpler to use inet_aton() but it is most
686 * likely not provided either. */
691 errno = EAFNOSUPPORT;
695 ipv4 = inet_addr( src );
696 if( ipv4 == INADDR_NONE )
699 memcpy( dst, &ipv4, 4 );
703 #endif /* HAVE_INET_PTON */