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: %m");
99 * Accepts only IPv6 connections on IPv6 sockets.
100 * If possible, we should open two sockets, but it is not always possible.
102 if (family == AF_INET6)
103 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
106 #if defined (WIN32) || defined (UNDER_CE)
107 # ifndef IPV6_PROTECTION_LEVEL
108 # warning Please update your C library headers.
109 # define IPV6_PROTECTION_LEVEL 23
110 # define PROTECTION_LEVEL_UNRESTRICTED 10
112 if (family == AF_INET6)
113 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
114 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
121 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
122 int i_port, int protocol)
124 struct addrinfo hints, *res;
125 int socktype = SOCK_DGRAM;
130 socktype = SOCK_STREAM;
137 socktype = SOCK_DCCP;
142 memset (&hints, 0, sizeof( hints ));
143 /* Since we use port numbers rather than service names, the socket type
144 * does not really matter. */
145 hints.ai_socktype = SOCK_DGRAM;
146 hints.ai_flags = AI_PASSIVE;
148 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
150 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
153 msg_Err (p_this, "Cannot resolve %s port %d : %s", psz_host, i_port,
154 vlc_gai_strerror (i_val));
161 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
163 int fd = net_Socket (p_this, ptr->ai_family, socktype, protocol);
166 msg_Dbg (p_this, "socket error: %m");
170 /* Bind the socket */
171 #if defined (WIN32) || defined (UNDER_CE)
173 * Under Win32 and for multicasting, we bind to INADDR_ANY.
174 * This is of course a severe bug, since the socket would logically
175 * receive unicast traffic, and multicast traffic of groups subscribed
176 * to via other sockets.
178 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
179 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
181 // This works for IPv4 too - don't worry!
182 struct sockaddr_in6 dumb =
184 .sin6_family = ptr->ai_addr->sa_family,
185 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
188 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
192 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
195 #if !defined(WIN32) && !defined(UNDER_CE)
196 fd = rootwrap_bind (ptr->ai_family, ptr->ai_socktype,
197 protocol ?: ptr->ai_protocol, ptr->ai_addr,
201 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
206 msg_Err (p_this, "socket bind error (%m)");
211 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
213 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
229 if (listen (fd, INT_MAX))
231 msg_Err (p_this, "socket listen error (%m)");
237 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
240 nsockv[sockc++] = fd;
247 vlc_freeaddrinfo (res);
257 net_ReadInner (vlc_object_t *restrict p_this, unsigned fdc, const int *fdv,
258 const v_socket_t *const *restrict vsv,
259 uint8_t *restrict p_buf, size_t i_buflen, vlc_bool_t waitall,
266 if( ( p_this->b_die ) || ( p_this->p_libvlc->b_die ) )
268 #if defined(WIN32) || defined(UNDER_CE)
269 WSASetLastError (WSAEINTR);
276 struct pollfd ufd[fdc];
278 for (unsigned i = 0; i < fdc; i++)
281 ufd[i].events = POLLIN;
285 switch (poll (ufd, fdc, timeout ? timeout : 500))
291 if( timeout ) return 0;
295 for (unsigned i = 0;; i++)
297 assert (i < fdc); /* no events found = bug ! */
299 if (ufd[i].revents == 0)
302 #ifndef POLLRDHUP /* This is nice but non-portable */
307 // Errors (-1) and EOF (0) will be returned on next run
308 if (ufd[i].revents & (POLLERR|POLLNVAL|POLLRDHUP))
313 if (ufd[i].revents & POLLRDHUP)
314 return 0; // EOF, read() would yield 0
327 n = (*vsv)->pf_recv ((*vsv)->p_sys, p_buf, i_buflen);
332 n = recv (*fdv, p_buf, i_buflen, 0);
334 n = read (*fdv, p_buf, i_buflen);
339 /* For streams, this means end of file, and there will not be any
340 * further data ever on the stream. For datagram sockets, this
341 * means empty datagram, and there could be more data coming.
342 * However, it makes no sense to set <waitall> with datagrams.
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 /* spurious wake-up or TLS did not yield any actual data */
386 msg_Err (p_this, "Read error: %m");
387 return i_total ? (ssize_t)i_total : -1;
391 /*****************************************************************************
393 *****************************************************************************
394 * Read from a network socket
395 * If b_retry is true, then we repeat until we have read the right amount of
396 * data; in that case, a short count means EOF has been reached.
397 *****************************************************************************/
398 ssize_t __net_Read( vlc_object_t *restrict p_this, int fd,
399 const v_socket_t *restrict p_vs,
400 uint8_t *restrict buf, size_t len, vlc_bool_t b_retry )
402 return net_ReadInner( p_this, 1, &(int){ fd },
403 &(const v_socket_t *){ p_vs },
404 buf, len, b_retry, 0 );
408 /*****************************************************************************
410 *****************************************************************************
411 * Read from several sockets. Takes data from the first socket that has some.
412 * if timeout is zero, net_Select will wait indefinitely. timeout is in
414 *****************************************************************************/
415 ssize_t __net_Select( vlc_object_t *restrict p_this,
416 const int *restrict fds, int nfd,
417 uint8_t *restrict buf, size_t len,
420 const v_socket_t *vsv[nfd];
421 memset( vsv, 0, sizeof (vsv) );
423 return net_ReadInner( p_this, nfd, fds, vsv,
424 buf, len, VLC_FALSE, timeout );
428 /* Write exact amount requested */
429 ssize_t __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
430 const uint8_t *p_data, size_t i_data )
439 struct pollfd ufd[1];
440 memset (ufd, 0, sizeof (ufd));
442 ufd[0].events = POLLOUT;
444 int val = poll (ufd, 1, 500);
448 msg_Err (p_this, "Write error: %m");
455 if ((ufd[0].revents & (POLLERR|POLLNVAL|POLLHUP)) && (i_total > 0))
456 return i_total; // error will be dequeued separately on next call
459 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
462 val = send (fd, p_data, i_data, 0);
464 val = write (fd, p_data, i_data);
469 msg_Err (p_this, "Write error: %m");
479 if ((i_total > 0) || (i_data == 0))
485 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
487 char *psz_line = NULL, *ptr = NULL;
488 size_t i_line = 0, i_max = 0;
493 if( i_line == i_max )
496 psz_line = realloc( psz_line, i_max );
497 ptr = psz_line + i_line;
500 if( net_Read( p_this, fd, p_vs, (uint8_t *)ptr, 1, VLC_TRUE ) != 1 )
519 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
525 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
526 const char *psz_fmt, ... )
530 va_start( args, psz_fmt );
531 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
537 ssize_t __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
538 const char *psz_fmt, va_list args )
543 i_size = vasprintf( &psz, psz_fmt, args );
544 i_ret = __net_Write( p_this, fd, p_vs, (uint8_t *)psz, i_size ) < i_size
552 /*****************************************************************************
553 * inet_pton replacement for obsolete and/or crap operating systems
554 *****************************************************************************/
555 #ifndef HAVE_INET_PTON
556 int inet_pton(int af, const char *src, void *dst)
559 /* As we already know, Microsoft always go its own way, so even if they do
560 * provide IPv6, they don't provide the API. */
561 struct sockaddr_storage addr;
562 int len = sizeof( addr );
564 /* Damn it, they didn't even put LPCSTR for the firs parameter!!! */
566 wchar_t *workaround_for_ill_designed_api =
567 malloc( MAX_PATH * sizeof(wchar_t) );
568 mbstowcs( workaround_for_ill_designed_api, src, MAX_PATH );
569 workaround_for_ill_designed_api[MAX_PATH-1] = 0;
571 char *workaround_for_ill_designed_api = strdup( src );
574 if( !WSAStringToAddress( workaround_for_ill_designed_api, af, NULL,
575 (LPSOCKADDR)&addr, &len ) )
577 free( workaround_for_ill_designed_api );
580 free( workaround_for_ill_designed_api );
585 memcpy( dst, &((struct sockaddr_in6 *)&addr)->sin6_addr, 16 );
589 memcpy( dst, &((struct sockaddr_in *)&addr)->sin_addr, 4 );
593 WSASetLastError( WSAEAFNOSUPPORT );
597 /* Assume IPv6 is not supported. */
598 /* Would be safer and more simpler to use inet_aton() but it is most
599 * likely not provided either. */
604 errno = EAFNOSUPPORT;
608 ipv4 = inet_addr( src );
609 if( ipv4 == INADDR_NONE )
612 memcpy( dst, &ipv4, 4 );
616 #endif /* HAVE_INET_PTON */
618 #ifndef HAVE_INET_NTOP
620 const char *inet_ntop(int af, const void * src,
621 char * dst, socklen_t cnt)
628 struct sockaddr_in6 addr;
629 memset(&addr, 0, sizeof(addr));
630 addr.sin6_family = AF_INET6;
631 addr.sin6_addr = *((struct in6_addr*)src);
632 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
633 sizeof(struct sockaddr_in6),
639 errno = WSAGetLastError();
647 struct sockaddr_in addr;
648 memset(&addr, 0, sizeof(addr));
649 addr.sin_family = AF_INET;
650 addr.sin_addr = *((struct in_addr*)src);
651 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
652 sizeof(struct sockaddr_in),
658 errno = WSAGetLastError();
663 errno = EAFNOSUPPORT;