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 *****************************************************************************/
47 #ifdef HAVE_SYS_TIME_H
48 # include <sys/time.h>
57 #include <vlc_network.h>
60 # define INADDR_ANY 0x00000000
63 # define INADDR_NONE 0xFFFFFFFF
66 #if defined(WIN32) || defined(UNDER_CE)
68 # define EAFNOSUPPORT WSAEAFNOSUPPORT
71 extern int rootwrap_bind (int family, int socktype, int protocol,
72 const struct sockaddr *addr, size_t alen);
74 int net_SetupSocket (int fd)
76 #if defined (WIN32) || defined (UNDER_CE)
77 ioctlsocket (fd, FIONBIO, &(unsigned long){ 1 });
79 fcntl (fd, F_SETFD, FD_CLOEXEC);
80 fcntl (fd, F_SETFL, fcntl (fd, F_GETFL, 0) | O_NONBLOCK);
83 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
88 int net_Socket (vlc_object_t *p_this, int family, int socktype,
91 int fd = socket (family, socktype, protocol);
94 if (net_errno != EAFNOSUPPORT)
95 msg_Err (p_this, "cannot create socket: %m");
103 * Accepts only IPv6 connections on IPv6 sockets.
104 * If possible, we should open two sockets, but it is not always possible.
106 if (family == AF_INET6)
107 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
110 #if defined (WIN32) || defined (UNDER_CE)
111 # ifndef IPV6_PROTECTION_LEVEL
112 # warning Please update your C library headers.
113 # define IPV6_PROTECTION_LEVEL 23
114 # define PROTECTION_LEVEL_UNRESTRICTED 10
116 if (family == AF_INET6)
117 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
118 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
125 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
126 int i_port, int protocol)
128 struct addrinfo hints, *res;
129 int socktype = SOCK_DGRAM;
134 socktype = SOCK_STREAM;
141 socktype = SOCK_DCCP;
146 memset (&hints, 0, sizeof( hints ));
147 /* Since we use port numbers rather than service names, the socket type
148 * does not really matter. */
149 hints.ai_socktype = SOCK_DGRAM;
150 hints.ai_flags = AI_PASSIVE;
152 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
154 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
157 msg_Err (p_this, "Cannot resolve %s port %d : %s", psz_host, i_port,
158 vlc_gai_strerror (i_val));
165 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
167 int fd = net_Socket (p_this, ptr->ai_family, socktype, protocol);
170 msg_Dbg (p_this, "socket error: %m");
174 /* Bind the socket */
175 #if defined (WIN32) || defined (UNDER_CE)
177 * Under Win32 and for multicasting, we bind to INADDR_ANY.
178 * This is of course a severe bug, since the socket would logically
179 * receive unicast traffic, and multicast traffic of groups subscribed
180 * to via other sockets.
182 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
183 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
185 // This works for IPv4 too - don't worry!
186 struct sockaddr_in6 dumb =
188 .sin6_family = ptr->ai_addr->sa_family,
189 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
192 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
196 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
199 #if !defined(WIN32) && !defined(UNDER_CE)
200 fd = rootwrap_bind (ptr->ai_family, ptr->ai_socktype,
201 protocol ?: ptr->ai_protocol, ptr->ai_addr,
205 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
210 msg_Err (p_this, "socket bind error (%m)");
215 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
217 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
233 if (listen (fd, INT_MAX))
235 msg_Err (p_this, "socket listen error (%m)");
241 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
244 nsockv[sockc++] = fd;
251 vlc_freeaddrinfo (res);
260 /*****************************************************************************
262 *****************************************************************************
263 * Reads from a network socket.
264 * If waitall is true, then we repeat until we have read the right amount of
265 * data; in that case, a short count means EOF has been reached or the VLC
266 * object has been signaled.
267 *****************************************************************************/
269 __net_Read (vlc_object_t *restrict p_this, int fd, const v_socket_t *vs,
270 uint8_t *restrict p_buf, size_t i_buflen, vlc_bool_t waitall)
273 struct pollfd ufd[2] = {
274 { .fd = fd, .events = POLLIN },
275 { .fd = -1, .events = POLLIN },
282 ufd[1].fd = vlc_object_waitpipe (p_this);
286 ufd[0].revents = ufd[1].revents = 0;
288 val = poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1);
295 msg_Dbg (p_this, "socket %d polling interrupted", fd);
298 #if defined(WIN32) || defined(UNDER_CE)
299 WSASetLastError (WSAEINTR);
308 assert (ufd[0].revents);
310 #ifndef POLLRDHUP /* This is nice but non-portable */
315 /* Errors (-1) and EOF (0) will be returned on next call,
316 * otherwise we'd "hide" the error from the caller, which is a
318 if (ufd[0].revents & (POLLERR|POLLNVAL|POLLRDHUP))
325 n = vs->pf_recv (vs->p_sys, p_buf, i_buflen);
330 n = recv (fd, p_buf, i_buflen, 0);
332 n = read (fd, p_buf, i_buflen);
338 #if defined(WIN32) || defined(UNDER_CE)
339 switch (WSAGetLastError ())
342 /* only happens with vs != NULL (TLS) - not really an error */
347 /* On Win32, recv() fails if the datagram doesn't fit inside
348 * the passed buffer, even though the buffer will be filled
349 * with the first part of the datagram. */
350 msg_Err (p_this, "Receive error: "
351 "Increase the mtu size (--mtu option)");
359 /* spurious wake-up or TLS did not yield any actual data */
367 /* For streams, this means end of file, and there will not be any
368 * further data ever on the stream. For datagram sockets, this
369 * means empty datagram, and there could be more data coming.
370 * However, it makes no sense to set <waitall> with datagrams in the
386 msg_Err (p_this, "Read error: %m");
391 /* Write exact amount requested */
392 ssize_t __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
393 const uint8_t *p_data, size_t i_data )
402 struct pollfd ufd[1];
403 memset (ufd, 0, sizeof (ufd));
405 ufd[0].events = POLLOUT;
407 int val = poll (ufd, 1, 500);
411 msg_Err (p_this, "Write error: %m");
418 if ((ufd[0].revents & (POLLERR|POLLNVAL|POLLHUP)) && (i_total > 0))
419 return i_total; // error will be dequeued separately on next call
422 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
425 val = send (fd, p_data, i_data, 0);
427 val = write (fd, p_data, i_data);
432 msg_Err (p_this, "Write error: %m");
442 if ((i_total > 0) || (i_data == 0))
448 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
450 char *psz_line = NULL, *ptr = NULL;
451 size_t i_line = 0, i_max = 0;
456 if( i_line == i_max )
459 psz_line = realloc( psz_line, i_max );
460 ptr = psz_line + i_line;
463 if( net_Read( p_this, fd, p_vs, (uint8_t *)ptr, 1, VLC_TRUE ) != 1 )
482 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
488 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
489 const char *psz_fmt, ... )
493 va_start( args, psz_fmt );
494 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
500 ssize_t __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
501 const char *psz_fmt, va_list args )
506 i_size = vasprintf( &psz, psz_fmt, args );
507 i_ret = __net_Write( p_this, fd, p_vs, (uint8_t *)psz, i_size ) < i_size
515 /*****************************************************************************
516 * inet_pton replacement for obsolete and/or crap operating systems
517 *****************************************************************************/
518 #ifndef HAVE_INET_PTON
519 int inet_pton(int af, const char *src, void *dst)
522 /* As we already know, Microsoft always go its own way, so even if they do
523 * provide IPv6, they don't provide the API. */
524 struct sockaddr_storage addr;
525 int len = sizeof( addr );
527 /* Damn it, they didn't even put LPCSTR for the firs parameter!!! */
529 wchar_t *workaround_for_ill_designed_api =
530 malloc( MAX_PATH * sizeof(wchar_t) );
531 mbstowcs( workaround_for_ill_designed_api, src, MAX_PATH );
532 workaround_for_ill_designed_api[MAX_PATH-1] = 0;
534 char *workaround_for_ill_designed_api = strdup( src );
537 if( !WSAStringToAddress( workaround_for_ill_designed_api, af, NULL,
538 (LPSOCKADDR)&addr, &len ) )
540 free( workaround_for_ill_designed_api );
543 free( workaround_for_ill_designed_api );
548 memcpy( dst, &((struct sockaddr_in6 *)&addr)->sin6_addr, 16 );
552 memcpy( dst, &((struct sockaddr_in *)&addr)->sin_addr, 4 );
556 WSASetLastError( WSAEAFNOSUPPORT );
560 /* Assume IPv6 is not supported. */
561 /* Would be safer and more simpler to use inet_aton() but it is most
562 * likely not provided either. */
567 errno = EAFNOSUPPORT;
571 ipv4 = inet_addr( src );
572 if( ipv4 == INADDR_NONE )
575 memcpy( dst, &ipv4, 4 );
579 #endif /* HAVE_INET_PTON */
581 #ifndef HAVE_INET_NTOP
583 const char *inet_ntop(int af, const void * src,
584 char * dst, socklen_t cnt)
591 struct sockaddr_in6 addr;
592 memset(&addr, 0, sizeof(addr));
593 addr.sin6_family = AF_INET6;
594 addr.sin6_addr = *((struct in6_addr*)src);
595 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
596 sizeof(struct sockaddr_in6),
602 errno = WSAGetLastError();
610 struct sockaddr_in addr;
611 memset(&addr, 0, sizeof(addr));
612 addr.sin_family = AF_INET;
613 addr.sin_addr = *((struct in_addr*)src);
614 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
615 sizeof(struct sockaddr_in),
621 errno = WSAGetLastError();
626 errno = EAFNOSUPPORT;