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 #ifdef HAVE_LINUX_DCCP_H
72 /* TODO: use glibc instead of linux-kernel headers */
73 # include <linux/dccp.h>
77 extern int rootwrap_bind (int family, int socktype, int protocol,
78 const struct sockaddr *addr, size_t alen);
80 int net_SetupSocket (int fd)
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));
94 int net_Socket (vlc_object_t *p_this, int family, int socktype,
97 int fd = socket (family, socktype, protocol);
100 if (net_errno != EAFNOSUPPORT)
101 msg_Err (p_this, "cannot create socket: %m");
105 net_SetupSocket (fd);
109 * Accepts only IPv6 connections on IPv6 sockets.
110 * If possible, we should open two sockets, but it is not always possible.
112 if (family == AF_INET6)
113 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
116 #if defined (WIN32) || defined (UNDER_CE)
117 # ifndef IPV6_PROTECTION_LEVEL
118 # warning Please update your C library headers.
119 # define IPV6_PROTECTION_LEVEL 23
120 # define PROTECTION_LEVEL_UNRESTRICTED 10
122 if (family == AF_INET6)
123 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
124 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
127 #ifdef DCCP_SOCKOPT_SERVICE
128 char *dccps = var_CreateGetNonEmptyString (p_this, "dccp-service");
131 setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SERVICE, dccps,
132 (strlen (dccps) + 3) & ~3);
141 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
142 int i_port, int protocol)
144 struct addrinfo hints, *res;
145 int socktype = SOCK_DGRAM;
150 socktype = SOCK_STREAM;
157 socktype = SOCK_DCCP;
162 memset (&hints, 0, sizeof( hints ));
163 /* Since we use port numbers rather than service names, the socket type
164 * does not really matter. */
165 hints.ai_socktype = SOCK_DGRAM;
166 hints.ai_flags = AI_PASSIVE;
168 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
170 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
173 msg_Err (p_this, "Cannot resolve %s port %d : %s", psz_host, i_port,
174 vlc_gai_strerror (i_val));
181 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
183 int fd = net_Socket (p_this, ptr->ai_family, socktype, protocol);
186 msg_Dbg (p_this, "socket error: %m");
190 /* Bind the socket */
191 #if defined (WIN32) || defined (UNDER_CE)
193 * Under Win32 and for multicasting, we bind to INADDR_ANY.
194 * This is of course a severe bug, since the socket would logically
195 * receive unicast traffic, and multicast traffic of groups subscribed
196 * to via other sockets.
198 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
199 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
201 // This works for IPv4 too - don't worry!
202 struct sockaddr_in6 dumb =
204 .sin6_family = ptr->ai_addr->sa_family,
205 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
208 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
212 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
215 #if !defined(WIN32) && !defined(UNDER_CE)
216 fd = rootwrap_bind (ptr->ai_family, ptr->ai_socktype,
217 protocol ?: ptr->ai_protocol, ptr->ai_addr,
221 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
226 msg_Err (p_this, "socket bind error (%m)");
231 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
233 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
249 if (listen (fd, INT_MAX))
251 msg_Err (p_this, "socket listen error (%m)");
257 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
260 nsockv[sockc++] = fd;
267 vlc_freeaddrinfo (res);
276 /*****************************************************************************
278 *****************************************************************************
279 * Reads from a network socket.
280 * If waitall is true, then we repeat until we have read the right amount of
281 * data; in that case, a short count means EOF has been reached or the VLC
282 * object has been signaled.
283 *****************************************************************************/
285 __net_Read (vlc_object_t *restrict p_this, int fd, const v_socket_t *vs,
286 uint8_t *restrict p_buf, size_t i_buflen, vlc_bool_t waitall)
289 struct pollfd ufd[2] = {
290 { .fd = fd, .events = POLLIN },
291 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
295 return -1; /* vlc_object_waitpipe() sets errno */
299 ufd[0].revents = ufd[1].revents = 0;
301 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) < 0)
308 #ifndef POLLRDHUP /* This is nice but non-portable */
313 /* Errors (-1) and EOF (0) will be returned on next call,
314 * otherwise we'd "hide" the error from the caller, which is a
316 if (ufd[0].revents & (POLLERR|POLLNVAL|POLLRDHUP))
325 assert (p_this->b_die);
326 msg_Dbg (p_this, "socket %d polling interrupted", fd);
327 #if defined(WIN32) || defined(UNDER_CE)
328 WSASetLastError (WSAEINTR);
336 assert (ufd[0].revents);
341 n = vs->pf_recv (vs->p_sys, p_buf, i_buflen);
346 n = recv (fd, p_buf, i_buflen, 0);
348 n = read (fd, p_buf, i_buflen);
354 #if defined(WIN32) || defined(UNDER_CE)
355 switch (WSAGetLastError ())
358 /* only happens with vs != NULL (TLS) - not really an error */
363 /* On Win32, recv() fails if the datagram doesn't fit inside
364 * the passed buffer, even though the buffer will be filled
365 * with the first part of the datagram. */
366 msg_Err (p_this, "Receive error: "
367 "Increase the mtu size (--mtu option)");
375 /* spurious wake-up or TLS did not yield any actual data */
383 /* For streams, this means end of file, and there will not be any
384 * further data ever on the stream. For datagram sockets, this
385 * means empty datagram, and there could be more data coming.
386 * However, it makes no sense to set <waitall> with datagrams in the
402 msg_Err (p_this, "Read error: %m");
407 /* Write exact amount requested */
408 ssize_t __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
409 const uint8_t *p_data, size_t i_data )
412 struct pollfd ufd[2] = {
413 { .fd = fd, .events = POLLOUT },
414 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
424 ufd[0].revents = ufd[1].revents = 0;
426 if (poll (ufd, 1, -1) == -1)
430 msg_Err (p_this, "Write error: %m");
438 /* Errors will be dequeued separately, upon next call. */
439 if (ufd[0].revents & (POLLERR|POLLNVAL|POLLHUP))
448 assert (p_this->b_die);
455 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
458 val = send (fd, p_data, i_data, 0);
460 val = write (fd, p_data, i_data);
465 msg_Err (p_this, "Write error: %m");
474 if ((i_total > 0) || (i_data == 0))
481 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
483 char *psz_line = NULL, *ptr = NULL;
484 size_t i_line = 0, i_max = 0;
489 if( i_line == i_max )
492 psz_line = realloc( psz_line, i_max );
493 ptr = psz_line + i_line;
496 if( net_Read( p_this, fd, p_vs, (uint8_t *)ptr, 1, VLC_TRUE ) != 1 )
515 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
521 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
522 const char *psz_fmt, ... )
526 va_start( args, psz_fmt );
527 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
533 ssize_t __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
534 const char *psz_fmt, va_list args )
539 i_size = vasprintf( &psz, psz_fmt, args );
540 i_ret = __net_Write( p_this, fd, p_vs, (uint8_t *)psz, i_size ) < i_size
548 /*****************************************************************************
549 * inet_pton replacement for obsolete and/or crap operating systems
550 *****************************************************************************/
551 #ifndef HAVE_INET_PTON
552 int inet_pton(int af, const char *src, void *dst)
555 /* As we already know, Microsoft always go its own way, so even if they do
556 * provide IPv6, they don't provide the API. */
557 struct sockaddr_storage addr;
558 int len = sizeof( addr );
560 /* Damn it, they didn't even put LPCSTR for the firs parameter!!! */
562 wchar_t *workaround_for_ill_designed_api =
563 malloc( MAX_PATH * sizeof(wchar_t) );
564 mbstowcs( workaround_for_ill_designed_api, src, MAX_PATH );
565 workaround_for_ill_designed_api[MAX_PATH-1] = 0;
567 char *workaround_for_ill_designed_api = strdup( src );
570 if( !WSAStringToAddress( workaround_for_ill_designed_api, af, NULL,
571 (LPSOCKADDR)&addr, &len ) )
573 free( workaround_for_ill_designed_api );
576 free( workaround_for_ill_designed_api );
581 memcpy( dst, &((struct sockaddr_in6 *)&addr)->sin6_addr, 16 );
585 memcpy( dst, &((struct sockaddr_in *)&addr)->sin_addr, 4 );
589 WSASetLastError( WSAEAFNOSUPPORT );
593 /* Assume IPv6 is not supported. */
594 /* Would be safer and more simpler to use inet_aton() but it is most
595 * likely not provided either. */
600 errno = EAFNOSUPPORT;
604 ipv4 = inet_addr( src );
605 if( ipv4 == INADDR_NONE )
608 memcpy( dst, &ipv4, 4 );
612 #endif /* HAVE_INET_PTON */
614 #ifndef HAVE_INET_NTOP
616 const char *inet_ntop(int af, const void * src,
617 char * dst, socklen_t cnt)
624 struct sockaddr_in6 addr;
625 memset(&addr, 0, sizeof(addr));
626 addr.sin6_family = AF_INET6;
627 addr.sin6_addr = *((struct in6_addr*)src);
628 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
629 sizeof(struct sockaddr_in6),
635 errno = WSAGetLastError();
643 struct sockaddr_in addr;
644 memset(&addr, 0, sizeof(addr));
645 addr.sin_family = AF_INET;
646 addr.sin_addr = *((struct in_addr*)src);
647 if( 0 == WSAAddressToStringA((LPSOCKADDR)&addr,
648 sizeof(struct sockaddr_in),
654 errno = WSAGetLastError();
659 errno = EAFNOSUPPORT;