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 and IPv4 connections on IPv6 sockets.
101 * If possible, we should open two sockets, but it is not always possible.
103 if (family == AF_INET6)
104 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 0 }, sizeof (int));
107 #if defined (WIN32) || defined (UNDER_CE)
108 # ifndef IPV6_PROTECTION_LEVEL
109 # warning Please update your C library headers.
110 # define IPV6_PROTECTION_LEVEL 23
111 # define PROTECTION_LEVEL_UNRESTRICTED 10
113 if (family == AF_INET6)
114 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
115 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
122 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
123 int i_port, int family, int socktype, int protocol)
125 struct addrinfo hints, *res;
127 memset (&hints, 0, sizeof( hints ));
128 hints.ai_family = family;
129 hints.ai_socktype = socktype;
130 hints.ai_flags = AI_PASSIVE;
132 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
134 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
137 msg_Err (p_this, "Cannot resolve %s port %d : %s", psz_host, i_port,
138 vlc_gai_strerror (i_val));
145 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
147 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
148 protocol ?: ptr->ai_protocol);
151 msg_Dbg (p_this, "socket error: %s", net_strerror (net_errno));
155 /* Bind the socket */
156 #if defined (WIN32) || defined (UNDER_CE)
158 * Under Win32 and for multicasting, we bind to INADDR_ANY.
159 * This is of course a severe bug, since the socket would logically
160 * receive unicast traffic, and multicast traffic of groups subscribed
161 * to via other sockets.
163 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
164 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
166 // This works for IPv4 too - don't worry!
167 struct sockaddr_in6 dumb =
169 .sin6_family = ptr->ai_addr->sa_family,
170 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
173 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
177 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
179 int saved_errno = net_errno;
182 #if !defined(WIN32) && !defined(UNDER_CE)
183 fd = rootwrap_bind (ptr->ai_family, ptr->ai_socktype,
184 protocol ?: ptr->ai_protocol, ptr->ai_addr,
188 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
193 msg_Err (p_this, "socket bind error (%s)",
194 net_strerror( saved_errno ) );
199 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
201 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
209 switch (ptr->ai_socktype)
214 if (listen (fd, INT_MAX))
216 msg_Err (p_this, "socket listen error (%s)",
217 net_strerror (net_errno));
223 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
226 nsockv[sockc++] = fd;
233 vlc_freeaddrinfo (res);
242 int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
243 int family, int socktype, int protocol)
245 int *fdv = net_Listen (obj, host, port, family, socktype, protocol);
249 for (unsigned i = 1; fdv[i] != -1; i++)
251 msg_Warn (obj, "Multiple sockets opened. Dropping extra ones!");
265 net_ReadInner (vlc_object_t *restrict p_this, unsigned fdc, const int *fdv,
266 const v_socket_t *const *restrict vsv,
267 uint8_t *restrict p_buf, size_t i_buflen, vlc_bool_t waitall)
275 #if defined(WIN32) || defined(UNDER_CE)
276 WSASetLastError (WSAEINTR);
283 struct pollfd ufd[fdc];
285 for (unsigned i = 0; i < fdc; i++)
288 ufd[i].events = POLLIN;
292 switch (poll (ufd, fdc, 500))
301 for (unsigned i = 0;; i++)
303 assert (i < fdc); /* no events found = bug ! */
305 if (ufd[i].revents == 0)
308 #ifndef POLLRDHUP /* This is nice but non-portable */
313 // Errors (-1) and EOF (0) will be returned on next run
314 if (ufd[i].revents & (POLLERR|POLLNVAL|POLLRDHUP))
319 if (ufd[i].revents & POLLRDHUP)
320 return 0; // EOF, read() would yield 0
333 n = (*vsv)->pf_recv ((*vsv)->p_sys, p_buf, i_buflen);
338 n = recv (*fdv, p_buf, i_buflen, 0);
340 n = read (*fdv, p_buf, i_buflen);
346 #if defined(WIN32) || defined(UNDER_CE)
347 switch (WSAGetLastError ())
350 /* only happens with vs != NULL (SSL) - not really an error */
355 /* On Win32, recv() fails if the datagram doesn't fit inside
356 * the passed buffer, even though the buffer will be filled
357 * with the first part of the datagram. */
358 msg_Err (p_this, "Receive error: "
359 "Increase the mtu size (--mtu option)");
367 /* spurious wake-up or TLS did not yield any actual data */
378 if ((n == 0) || !waitall)
384 msg_Err (p_this, "Read error: %s", net_strerror (net_errno));
385 return i_total ? (ssize_t)i_total : -1;
389 /*****************************************************************************
391 *****************************************************************************
392 * Read from a network socket
393 * If b_retry is true, then we repeat until we have read the right amount of
394 * data; in that case, a short count means EOF has been reached.
395 *****************************************************************************/
396 ssize_t __net_Read( vlc_object_t *restrict p_this, int fd,
397 const v_socket_t *restrict p_vs,
398 uint8_t *restrict buf, size_t len, vlc_bool_t b_retry )
400 return net_ReadInner( p_this, 1, &(int){ fd },
401 &(const v_socket_t *){ p_vs },
406 /*****************************************************************************
408 *****************************************************************************
409 * Read from several sockets. Takes data from the first socket that has some.
410 *****************************************************************************/
411 ssize_t __net_Select( vlc_object_t *restrict p_this,
412 const int *restrict fds, int nfd,
413 uint8_t *restrict buf, size_t len )
415 const v_socket_t *vsv[nfd];
416 memset( vsv, 0, sizeof (vsv) );
418 return net_ReadInner( p_this, nfd, fds, vsv,
419 buf, len, VLC_FALSE );
423 /* Write exact amount requested */
424 ssize_t __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
425 const uint8_t *p_data, size_t i_data )
434 struct pollfd ufd[1];
435 memset (ufd, 0, sizeof (ufd));
437 ufd[0].events = POLLOUT;
439 int val = poll (ufd, 1, 500);
443 msg_Err (p_this, "Write error: %s", net_strerror (net_errno));
450 if ((ufd[0].revents & (POLLERR|POLLNVAL|POLLHUP)) && (i_total > 0))
451 return i_total; // error will be dequeued separately on next call
454 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
457 val = send (fd, p_data, i_data, 0);
459 val = write (fd, p_data, i_data);
464 msg_Err (p_this, "Write error: %s", net_strerror (net_errno));
474 if ((i_total > 0) || (i_data == 0))
480 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
482 char *psz_line = NULL, *ptr = NULL;
483 size_t i_line = 0, i_max = 0;
488 if( i_line == i_max )
491 psz_line = realloc( psz_line, i_max );
492 ptr = psz_line + i_line;
495 if( net_Read( p_this, fd, p_vs, (uint8_t *)ptr, 1, VLC_TRUE ) != 1 )
514 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
520 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
521 const char *psz_fmt, ... )
525 va_start( args, psz_fmt );
526 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
532 ssize_t __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
533 const char *psz_fmt, va_list args )
538 i_size = vasprintf( &psz, psz_fmt, args );
539 i_ret = __net_Write( p_this, fd, p_vs, (uint8_t *)psz, i_size ) < i_size
547 /*****************************************************************************
548 * inet_pton replacement for obsolete and/or crap operating systems
549 *****************************************************************************/
550 #ifndef HAVE_INET_PTON
551 int inet_pton(int af, const char *src, void *dst)
554 /* As we already know, Microsoft always go its own way, so even if they do
555 * provide IPv6, they don't provide the API. */
556 struct sockaddr_storage addr;
557 int len = sizeof( addr );
559 /* Damn it, they didn't even put LPCSTR for the firs parameter!!! */
561 wchar_t *workaround_for_ill_designed_api =
562 malloc( MAX_PATH * sizeof(wchar_t) );
563 mbstowcs( workaround_for_ill_designed_api, src, MAX_PATH );
564 workaround_for_ill_designed_api[MAX_PATH-1] = 0;
566 char *workaround_for_ill_designed_api = strdup( src );
569 if( !WSAStringToAddress( workaround_for_ill_designed_api, af, NULL,
570 (LPSOCKADDR)&addr, &len ) )
572 free( workaround_for_ill_designed_api );
575 free( workaround_for_ill_designed_api );
580 memcpy( dst, &((struct sockaddr_in6 *)&addr)->sin6_addr, 16 );
584 memcpy( dst, &((struct sockaddr_in *)&addr)->sin_addr, 4 );
588 WSASetLastError( WSAEAFNOSUPPORT );
592 /* Assume IPv6 is not supported. */
593 /* Would be safer and more simpler to use inet_aton() but it is most
594 * likely not provided either. */
599 errno = EAFNOSUPPORT;
603 ipv4 = inet_addr( src );
604 if( ipv4 == INADDR_NONE )
607 memcpy( dst, &ipv4, 4 );
611 #endif /* HAVE_INET_PTON */
613 #ifndef HAVE_INET_NTOP
615 const char *inet_ntop(int af, const void * src,
616 char * dst, socklen_t cnt)
623 struct sockaddr_in6 addr;
624 memset(&addr, 0, sizeof(addr));
625 addr.sin6_family = AF_INET6;
626 addr.sin6_addr = *((struct in6_addr*)src);
627 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
628 sizeof(struct sockaddr_in6),
634 errno = WSAGetLastError();
642 struct sockaddr_in addr;
643 memset(&addr, 0, sizeof(addr));
644 addr.sin_family = AF_INET;
645 addr.sin_addr = *((struct in_addr*)src);
646 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
647 sizeof(struct sockaddr_in),
653 errno = WSAGetLastError();
658 errno = EAFNOSUPPORT;