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_Socket (vlc_object_t *p_this, int family, int socktype,
73 int fd = socket (family, socktype, protocol);
76 if (net_errno != EAFNOSUPPORT)
77 msg_Err (p_this, "cannot create socket: %s",
78 net_strerror (net_errno));
82 #if defined (WIN32) || defined (UNDER_CE)
83 ioctlsocket (fd, FIONBIO, &(unsigned long){ 1 });
85 fcntl (fd, F_SETFD, FD_CLOEXEC);
86 fcntl (fd, F_SETFL, fcntl (fd, F_GETFL, 0) | O_NONBLOCK);
89 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
93 * Accepts only IPv6 connections on IPv6 sockets
94 * (and open an IPv4 socket later as well if needed).
95 * Only Linux and FreeBSD can map IPv4 connections on IPv6 sockets,
96 * so this allows for more uniform handling across platforms. Besides,
97 * it makes sure that IPv4 addresses will be printed as w.x.y.z rather
100 if (family == AF_INET6)
101 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
104 #if defined (WIN32) || defined (UNDER_CE)
105 # ifndef IPV6_PROTECTION_LEVEL
106 # warning Please update your C library headers.
107 # define IPV6_PROTECTION_LEVEL 23
108 # define PROTECTION_LEVEL_UNRESTRICTED 10
110 if (family == AF_INET6)
111 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
112 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
119 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
120 int i_port, int family, int socktype, int protocol)
122 struct addrinfo hints, *res;
124 memset (&hints, 0, sizeof( hints ));
125 hints.ai_family = family;
126 hints.ai_socktype = socktype;
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,
145 protocol ?: ptr->ai_protocol);
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 protocol ?: 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, "Multiple sockets opened. Dropping extra ones!");
261 /*****************************************************************************
263 *****************************************************************************
264 * Close a network handle
265 *****************************************************************************/
266 void net_Close (int fd)
269 CloseHandle ((HANDLE)fd);
270 #elif defined (WIN32)
279 net_ReadInner( vlc_object_t *restrict p_this, unsigned fdc, const int *fdv,
280 const v_socket_t *const *restrict vsv,
281 uint8_t *restrict p_buf, size_t i_buflen,
282 int wait_ms, vlc_bool_t waitall )
290 struct pollfd ufd[fdc];
293 if ((wait_ms != -1) && (wait_ms < 500))
302 memset (ufd, 0, sizeof (ufd));
304 for( i = 0; i < fdc; i++ )
307 ufd[i].events = POLLIN;
310 n = poll( ufd, fdc, delay_ms );
314 assert ((unsigned)n <= fdc);
316 if (n == 0) // timeout
321 if ((i_total > 0) && (ufd[i].revents & POLLERR))
322 return i_total; // error will be dequeued on next run
324 if ((ufd[i].revents & POLLIN) == 0)
335 n = (*vsv)->pf_recv( (*vsv)->p_sys, p_buf, i_buflen );
339 #if defined(WIN32) || defined(UNDER_CE)
340 n = recv( *fdv, p_buf, i_buflen, 0 );
342 n = read( *fdv, p_buf, i_buflen );
348 #if defined(WIN32) || defined(UNDER_CE)
349 switch( WSAGetLastError() )
352 /* only happens with vs != NULL (SSL) - not really an error */
357 /* On Win32, recv() fails if the datagram doesn't fit inside
358 * the passed buffer, even though the buffer will be filled
359 * with the first part of the datagram. */
360 msg_Err( p_this, "Receive error: "
361 "Increase the mtu size (--mtu option)" );
369 if( errno == EAGAIN ) /* spurious wake-up (sucks if fdc > 1) */
385 /* FIXME: This is broken. Do not us this. */
390 return i_total; // time's up!
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, -1, 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, 0, VLC_FALSE);
435 /*****************************************************************************
437 *****************************************************************************
438 * Read from several sockets (with timeout). Takes data from the first socket
440 * NOTE: DO NOT USE this API with a non-zero delay. You were warned.
441 *****************************************************************************/
442 ssize_t __net_Select( vlc_object_t *restrict p_this,
443 const int *restrict fds, int nfd,
444 uint8_t *restrict buf, size_t len, mtime_t i_wait )
446 const v_socket_t *vsv[nfd];
447 memset( vsv, 0, sizeof (vsv) );
449 return net_ReadInner( p_this, nfd, fds, vsv, buf, len,
450 i_wait / 1000, VLC_FALSE );
454 /* Write exact amount requested */
455 ssize_t __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
456 const uint8_t *p_data, size_t i_data )
465 struct pollfd ufd[1];
466 memset (ufd, 0, sizeof (ufd));
468 ufd[0].events = POLLOUT;
470 int val = poll (ufd, 1, 500);
474 msg_Err (p_this, "Write error: %s", net_strerror (net_errno));
481 if ((ufd[0].revents & POLLERR) && (i_total > 0))
482 return i_total; // error will be dequeued separately on next call
485 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
487 #if defined(WIN32) || defined(UNDER_CE)
488 val = send (fd, p_data, i_data, 0);
490 val = write (fd, p_data, i_data);
495 msg_Err (p_this, "Write error: %s", net_strerror (net_errno));
507 if ((i_total > 0) || (i_data == 0))
513 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
515 char *psz_line = NULL, *ptr = NULL;
516 size_t i_line = 0, i_max = 0;
521 if( i_line == i_max )
524 psz_line = realloc( psz_line, i_max );
525 ptr = psz_line + i_line;
528 if( net_Read( p_this, fd, p_vs, (uint8_t *)ptr, 1, VLC_TRUE ) != 1 )
547 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
553 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
554 const char *psz_fmt, ... )
558 va_start( args, psz_fmt );
559 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
565 ssize_t __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
566 const char *psz_fmt, va_list args )
571 i_size = vasprintf( &psz, psz_fmt, args );
572 i_ret = __net_Write( p_this, fd, p_vs, (uint8_t *)psz, i_size ) < i_size
580 /*****************************************************************************
581 * inet_pton replacement for obsolete and/or crap operating systems
582 *****************************************************************************/
583 #ifndef HAVE_INET_PTON
584 int inet_pton(int af, const char *src, void *dst)
587 /* As we already know, Microsoft always go its own way, so even if they do
588 * provide IPv6, they don't provide the API. */
589 struct sockaddr_storage addr;
590 int len = sizeof( addr );
592 /* Damn it, they didn't even put LPCSTR for the firs parameter!!! */
594 wchar_t *workaround_for_ill_designed_api =
595 malloc( MAX_PATH * sizeof(wchar_t) );
596 mbstowcs( workaround_for_ill_designed_api, src, MAX_PATH );
597 workaround_for_ill_designed_api[MAX_PATH-1] = 0;
599 char *workaround_for_ill_designed_api = strdup( src );
602 if( !WSAStringToAddress( workaround_for_ill_designed_api, af, NULL,
603 (LPSOCKADDR)&addr, &len ) )
605 free( workaround_for_ill_designed_api );
608 free( workaround_for_ill_designed_api );
613 memcpy( dst, &((struct sockaddr_in6 *)&addr)->sin6_addr, 16 );
617 memcpy( dst, &((struct sockaddr_in *)&addr)->sin_addr, 4 );
621 WSASetLastError( WSAEAFNOSUPPORT );
625 /* Assume IPv6 is not supported. */
626 /* Would be safer and more simpler to use inet_aton() but it is most
627 * likely not provided either. */
632 errno = EAFNOSUPPORT;
636 ipv4 = inet_addr( src );
637 if( ipv4 == INADDR_NONE )
640 memcpy( dst, &ipv4, 4 );
644 #endif /* HAVE_INET_PTON */
646 #ifndef HAVE_INET_NTOP
648 const char *inet_ntop(int af, const void * src,
649 char * dst, socklen_t cnt)
656 struct sockaddr_in6 addr;
657 memset(&addr, 0, sizeof(addr));
658 addr.sin6_family = AF_INET6;
659 addr.sin6_addr = *((struct in6_addr*)src);
660 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
661 sizeof(struct sockaddr_in6),
667 errno = WSAGetLastError();
675 struct sockaddr_in addr;
676 memset(&addr, 0, sizeof(addr));
677 addr.sin_family = AF_INET;
678 addr.sin_addr = *((struct in_addr*)src);
679 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
680 sizeof(struct sockaddr_in),
686 errno = WSAGetLastError();
691 errno = EAFNOSUPPORT;