1 /*****************************************************************************
2 * io.c: network I/O functions
3 *****************************************************************************
4 * Copyright (C) 2004-2005, 2007 VLC authors and VideoLAN
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 it
13 * under the terms of the GNU Lesser General Public License as published by
14 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
35 #include <vlc_common.h>
52 #include <vlc_network.h>
55 # define INADDR_ANY 0x00000000
58 # define INADDR_NONE 0xFFFFFFFF
63 # define EAFNOSUPPORT WSAEAFNOSUPPORT
66 #ifdef HAVE_LINUX_DCCP_H
67 /* TODO: use glibc instead of linux-kernel headers */
68 # include <linux/dccp.h>
72 #include "libvlc.h" /* vlc_object_waitpipe */
74 extern int rootwrap_bind (int family, int socktype, int protocol,
75 const struct sockaddr *addr, size_t alen);
77 int net_Socket (vlc_object_t *p_this, int family, int socktype,
80 int fd = vlc_socket (family, socktype, protocol, true);
83 if (net_errno != EAFNOSUPPORT)
84 msg_Err (p_this, "cannot create socket: %m");
88 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
92 * Accepts only IPv6 connections on IPv6 sockets.
93 * If possible, we should open two sockets, but it is not always possible.
95 if (family == AF_INET6)
96 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
100 # ifndef IPV6_PROTECTION_LEVEL
101 # warning Please update your C library headers.
102 # define IPV6_PROTECTION_LEVEL 23
103 # define PROTECTION_LEVEL_UNRESTRICTED 10
105 if (family == AF_INET6)
106 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
107 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
110 #ifdef DCCP_SOCKOPT_SERVICE
111 if (socktype == SOL_DCCP)
113 char *dccps = var_InheritString (p_this, "dccp-service");
116 setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SERVICE, dccps,
117 (strlen (dccps) + 3) & ~3);
127 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
128 int i_port, int type, int protocol)
130 struct addrinfo hints = {
132 .ai_protocol = protocol,
133 .ai_flags = AI_PASSIVE | AI_NUMERICSERV | AI_IDN,
136 msg_Dbg (p_this, "net: listening to %s port %d",
137 (psz_host != NULL) ? psz_host : "*", i_port);
139 int i_val = vlc_getaddrinfo (psz_host, i_port, &hints, &res);
142 msg_Err (p_this, "Cannot resolve %s port %d : %s",
143 (psz_host != NULL) ? psz_host : "", i_port,
144 gai_strerror (i_val));
151 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
153 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
157 msg_Dbg (p_this, "socket error: %m");
161 /* Bind the socket */
164 * Under Win32 and for multicasting, we bind to INADDR_ANY.
165 * This is of course a severe bug, since the socket would logically
166 * receive unicast traffic, and multicast traffic of groups subscribed
167 * to via other sockets.
169 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
170 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
172 // This works for IPv4 too - don't worry!
173 struct sockaddr_in6 dumb =
175 .sin6_family = ptr->ai_addr->sa_family,
176 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
179 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
183 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
187 fd = rootwrap_bind (ptr->ai_family, ptr->ai_socktype,
189 ptr->ai_addr, ptr->ai_addrlen);
192 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
197 msg_Err (p_this, "socket bind error (%m)");
202 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
204 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
212 switch (ptr->ai_socktype)
220 if (listen (fd, INT_MAX))
222 msg_Err (p_this, "socket listen error (%m)");
228 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
231 nsockv[sockc++] = fd;
247 /*****************************************************************************
249 *****************************************************************************
250 * Reads from a network socket. Cancellation point.
251 * If waitall is true, then we repeat until we have read the right amount of
252 * data; in that case, a short count means EOF has been reached or the VLC
253 * object has been signaled.
254 *****************************************************************************/
256 net_Read (vlc_object_t *restrict p_this, int fd, const v_socket_t *vs,
257 void *restrict p_buf, size_t i_buflen, bool waitall)
260 struct pollfd ufd[2] = {
261 { .fd = fd, .events = POLLIN },
262 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
266 return -1; /* vlc_object_waitpipe() sets errno */
270 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) < 0)
279 /* Errors (-1) and EOF (0) will be returned on next call,
280 * otherwise we'd "hide" the error from the caller, which is a
282 if (ufd[0].revents & (POLLERR|POLLNVAL))
291 msg_Dbg (p_this, "socket %d polling interrupted", fd);
293 WSASetLastError (WSAEINTR);
301 assert (ufd[0].revents);
309 int canc = vlc_savecancel ();
310 n = vs->pf_recv (vs->p_sys, p_buf, i_buflen);
312 /* We must read last error immediately, because vlc_restorecancel()
313 * access thread local storage, and TlsGetValue() will call
314 * SetLastError() to indicate that the function succeeded, thus
315 * overwriting the error code coming from pf_recv().
316 * WSAGetLastError is just an alias for GetLastError these days.
318 error = WSAGetLastError();
320 vlc_restorecancel (canc);
325 n = recv (fd, p_buf, i_buflen, 0);
326 error = WSAGetLastError();
328 n = read (fd, p_buf, i_buflen);
339 /* only happens with vs != NULL (TLS) - not really an error */
344 /* On Win32, recv() fails if the datagram doesn't fit inside
345 * the passed buffer, even though the buffer will be filled
346 * with the first part of the datagram. */
347 msg_Err (p_this, "Receive error: "
348 "Increase the mtu size (--mtu option)");
355 case EAGAIN: /* spurious wakeup or no TLS data */
356 #if (EAGAIN != EWOULDBLOCK)
359 case EINTR: /* asynchronous signal */
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
376 p_buf = (char *)p_buf + n;
386 msg_Err (p_this, "Read error: %m");
393 * Writes data to a file descriptor.
394 * This blocks until all data is written or an error occurs.
396 * This function is a cancellation point if p_vs is NULL.
397 * This function is not cancellation-safe if p_vs is not NULL.
399 * @return the total number of bytes written, or -1 if an error occurs
400 * before any data is written.
402 ssize_t net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
403 const void *restrict p_data, size_t i_data )
406 struct pollfd ufd[2] = {
407 { .fd = fd, .events = POLLOUT },
408 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
411 if (unlikely(ufd[1].fd == -1))
421 ufd[0].revents = ufd[1].revents = 0;
423 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) == -1)
427 msg_Err (p_this, "Polling error: %m");
432 { /* If POLLHUP resp. POLLERR|POLLNVAL occurs while we have already
433 * read some data, it is important that we first return the number
434 * of bytes read, and then return 0 resp. -1 on the NEXT call. */
435 if (ufd[0].revents & (POLLHUP|POLLERR|POLLNVAL))
437 if (ufd[1].revents) /* VLC object signaled */
450 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
453 val = send (fd, p_data, i_data, 0);
455 val = write (fd, p_data, i_data);
462 msg_Err (p_this, "Write error: %m");
466 p_data = (const char *)p_data + val;
471 if (unlikely(i_data == 0))
472 vlc_testcancel (); /* corner case */
474 if ((i_total > 0) || (i_data == 0))
483 * Reads a line from a file descriptor.
484 * This function is not thread-safe; the same file descriptor I/O cannot be
485 * read by another thread at the same time (although it can be written to).
487 * @return nul-terminated heap-allocated string, or NULL on I/O error.
489 char *net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
491 char *psz_line = NULL, *ptr = NULL;
492 size_t i_line = 0, i_max = 0;
497 if( i_line == i_max )
500 psz_line = xrealloc( psz_line, i_max );
501 ptr = psz_line + i_line;
504 if( net_Read( p_this, fd, p_vs, ptr, 1, true ) != 1 )
523 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
530 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
531 const char *psz_fmt, ... )
535 va_start( args, psz_fmt );
536 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
543 ssize_t net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
544 const char *psz_fmt, va_list args )
549 int i_size = vasprintf( &psz, psz_fmt, args );
552 i_ret = net_Write( p_this, fd, p_vs, psz, i_size ) < i_size