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 *****************************************************************************/
35 #include <vlc_common.h>
54 #include <vlc_network.h>
57 # define INADDR_ANY 0x00000000
60 # define INADDR_NONE 0xFFFFFFFF
63 #if defined(WIN32) || defined(UNDER_CE)
65 # define EAFNOSUPPORT WSAEAFNOSUPPORT
68 #ifdef HAVE_LINUX_DCCP_H
69 /* TODO: use glibc instead of linux-kernel headers */
70 # include <linux/dccp.h>
74 #include "libvlc.h" /* vlc_object_waitpipe */
76 extern int rootwrap_bind (int family, int socktype, int protocol,
77 const struct sockaddr *addr, size_t alen);
79 int net_Socket (vlc_object_t *p_this, int family, int socktype,
82 int fd = vlc_socket (family, socktype, protocol, true);
85 if (net_errno != EAFNOSUPPORT)
86 msg_Err (p_this, "cannot create socket: %m");
90 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
94 * Accepts only IPv6 connections on IPv6 sockets.
95 * If possible, we should open two sockets, but it is not always possible.
97 if (family == AF_INET6)
98 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
101 #if defined (WIN32) || defined (UNDER_CE)
102 # ifndef IPV6_PROTECTION_LEVEL
103 # warning Please update your C library headers.
104 # define IPV6_PROTECTION_LEVEL 23
105 # define PROTECTION_LEVEL_UNRESTRICTED 10
107 if (family == AF_INET6)
108 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
109 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
112 #ifdef DCCP_SOCKOPT_SERVICE
113 if (socktype == SOL_DCCP)
115 char *dccps = var_CreateGetNonEmptyString (p_this, "dccp-service");
118 setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SERVICE, dccps,
119 (strlen (dccps) + 3) & ~3);
129 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
130 int i_port, int protocol)
132 struct addrinfo hints, *res;
134 memset (&hints, 0, sizeof( hints ));
135 hints.ai_protocol = protocol;
136 hints.ai_flags = AI_PASSIVE;
138 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
140 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
143 msg_Err (p_this, "Cannot resolve %s port %d : %s", 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 */
162 #if defined (WIN32) || defined (UNDER_CE)
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))
186 #if !defined(WIN32) && !defined(UNDER_CE)
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 ufd[0].revents = ufd[1].revents = 0;
272 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) < 0)
279 #ifndef POLLRDHUP /* This is nice but non-portable */
284 /* Errors (-1) and EOF (0) will be returned on next call,
285 * otherwise we'd "hide" the error from the caller, which is a
287 if (ufd[0].revents & (POLLERR|POLLNVAL|POLLRDHUP))
296 assert (p_this->b_die);
297 msg_Dbg (p_this, "socket %d polling interrupted", fd);
298 #if defined(WIN32) || defined(UNDER_CE)
299 WSASetLastError (WSAEINTR);
307 assert (ufd[0].revents);
312 int canc = vlc_savecancel ();
313 n = vs->pf_recv (vs->p_sys, p_buf, i_buflen);
314 vlc_restorecancel (canc);
319 n = recv (fd, p_buf, i_buflen, 0);
321 n = read (fd, p_buf, i_buflen);
327 #if defined(WIN32) || defined(UNDER_CE)
328 switch (WSAGetLastError ())
332 /* only happens with vs != NULL (TLS) - not really an error */
337 /* On Win32, recv() fails if the datagram doesn't fit inside
338 * the passed buffer, even though the buffer will be filled
339 * with the first part of the datagram. */
340 msg_Err (p_this, "Receive error: "
341 "Increase the mtu size (--mtu option)");
348 case EAGAIN: /* spurious wakeup or no TLS data */
349 #if (EAGAIN != EWOULDBLOCK)
352 case EINTR: /* asynchronous signal */
360 /* For streams, this means end of file, and there will not be any
361 * further data ever on the stream. For datagram sockets, this
362 * means empty datagram, and there could be more data coming.
363 * However, it makes no sense to set <waitall> with datagrams in the
369 p_buf = (char *)p_buf + n;
379 msg_Err (p_this, "Read error: %m");
386 * Writes data to a file descriptor.
387 * This blocks until all data is written or an error occurs.
389 * This function is a cancellation point if p_vs is NULL.
390 * This function is not cancellation-safe if p_vs is not NULL.
392 * @return the total number of bytes written, or -1 if an error occurs
393 * before any data is written.
395 ssize_t net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
396 const void *restrict p_data, size_t i_data )
399 struct pollfd ufd[2] = {
400 { .fd = fd, .events = POLLOUT },
401 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
404 if (unlikely(ufd[1].fd == -1))
414 ufd[0].revents = ufd[1].revents = 0;
416 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) == -1)
420 msg_Err (p_this, "Polling error: %m");
425 { /* If POLLHUP resp. POLLERR|POLLNVAL occurs while we have already
426 * read some data, it is important that we first return the number
427 * of bytes read, and then return 0 resp. -1 on the NEXT call. */
428 if (ufd[0].revents & (POLLHUP|POLLERR|POLLNVAL))
430 if (ufd[1].revents) /* VLC object signaled */
437 assert (p_this->b_die);
444 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
447 val = send (fd, p_data, i_data, 0);
449 val = write (fd, p_data, i_data);
456 msg_Err (p_this, "Write error: %m");
460 p_data = (const char *)p_data + val;
465 if (unlikely(i_data == 0))
466 vlc_testcancel (); /* corner case */
468 if ((i_total > 0) || (i_data == 0))
477 * Reads a line from a file descriptor.
478 * This function is not thread-safe; the same file descriptor I/O cannot be
479 * read by another thread at the same time (although it can be written to).
481 * @return nul-terminated heap-allocated string, or NULL on I/O error.
483 char *net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
485 char *psz_line = NULL, *ptr = NULL;
486 size_t i_line = 0, i_max = 0;
491 if( i_line == i_max )
494 psz_line = xrealloc( psz_line, i_max );
495 ptr = psz_line + i_line;
498 if( net_Read( p_this, fd, p_vs, ptr, 1, true ) != 1 )
517 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
524 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
525 const char *psz_fmt, ... )
529 va_start( args, psz_fmt );
530 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 int i_size = vasprintf( &psz, psz_fmt, args );
546 i_ret = net_Write( p_this, fd, p_vs, psz, i_size ) < i_size