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>
47 #ifdef HAVE_SYS_TIME_H
48 # include <sys/time.h>
57 #include <vlc_network.h>
58 #include <vlc_memory.h>
61 # define INADDR_ANY 0x00000000
64 # define INADDR_NONE 0xFFFFFFFF
67 #if defined(WIN32) || defined(UNDER_CE)
69 # define EAFNOSUPPORT WSAEAFNOSUPPORT
72 #ifdef HAVE_LINUX_DCCP_H
73 /* TODO: use glibc instead of linux-kernel headers */
74 # include <linux/dccp.h>
78 #include "libvlc.h" /* vlc_object_waitpipe */
80 extern int rootwrap_bind (int family, int socktype, int protocol,
81 const struct sockaddr *addr, size_t alen);
83 int net_SetupSocket (int fd)
85 #if defined (WIN32) || defined (UNDER_CE)
86 ioctlsocket (fd, FIONBIO, &(unsigned long){ 1 });
88 fcntl (fd, F_SETFD, FD_CLOEXEC);
89 fcntl (fd, F_SETFL, fcntl (fd, F_GETFL, 0) | O_NONBLOCK);
92 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
97 int net_Socket (vlc_object_t *p_this, int family, int socktype,
103 fd = socket (family, socktype | SOCK_NONBLOCK | SOCK_CLOEXEC, protocol);
104 if (fd == -1 && errno == EINVAL)
107 fd = socket (family, socktype, protocol);
110 if (net_errno != EAFNOSUPPORT)
111 msg_Err (p_this, "cannot create socket: %m");
115 fcntl (fd, F_SETFD, FD_CLOEXEC);
116 fcntl (fd, F_SETFL, fcntl (fd, F_GETFL, 0) | O_NONBLOCK);
118 ioctlsocket (fd, FIONBIO, &(unsigned long){ 1 });
122 setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &(int){ 1 }, sizeof (int));
126 * Accepts only IPv6 connections on IPv6 sockets.
127 * If possible, we should open two sockets, but it is not always possible.
129 if (family == AF_INET6)
130 setsockopt (fd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){ 1 }, sizeof (int));
133 #if defined (WIN32) || defined (UNDER_CE)
134 # ifndef IPV6_PROTECTION_LEVEL
135 # warning Please update your C library headers.
136 # define IPV6_PROTECTION_LEVEL 23
137 # define PROTECTION_LEVEL_UNRESTRICTED 10
139 if (family == AF_INET6)
140 setsockopt (fd, IPPROTO_IPV6, IPV6_PROTECTION_LEVEL,
141 &(int){ PROTECTION_LEVEL_UNRESTRICTED }, sizeof (int));
144 #ifdef DCCP_SOCKOPT_SERVICE
145 if (socktype == SOL_DCCP)
147 char *dccps = var_CreateGetNonEmptyString (p_this, "dccp-service");
150 setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SERVICE, dccps,
151 (strlen (dccps) + 3) & ~3);
161 int *net_Listen (vlc_object_t *p_this, const char *psz_host,
162 int i_port, int protocol)
164 struct addrinfo hints, *res;
165 int socktype = SOCK_DGRAM;
170 socktype = SOCK_STREAM;
177 socktype = SOCK_DCCP;
182 memset (&hints, 0, sizeof( hints ));
183 /* Since we use port numbers rather than service names, the socket type
184 * does not really matter. */
185 hints.ai_socktype = SOCK_DGRAM;
186 hints.ai_flags = AI_PASSIVE;
188 msg_Dbg (p_this, "net: listening to %s port %d", psz_host, i_port);
190 int i_val = vlc_getaddrinfo (p_this, psz_host, i_port, &hints, &res);
193 msg_Err (p_this, "Cannot resolve %s port %d : %s", psz_host, i_port,
194 vlc_gai_strerror (i_val));
201 for (struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
203 int fd = net_Socket (p_this, ptr->ai_family, socktype, protocol);
206 msg_Dbg (p_this, "socket error: %m");
210 /* Bind the socket */
211 #if defined (WIN32) || defined (UNDER_CE)
213 * Under Win32 and for multicasting, we bind to INADDR_ANY.
214 * This is of course a severe bug, since the socket would logically
215 * receive unicast traffic, and multicast traffic of groups subscribed
216 * to via other sockets.
218 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
219 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
221 // This works for IPv4 too - don't worry!
222 struct sockaddr_in6 dumb =
224 .sin6_family = ptr->ai_addr->sa_family,
225 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
228 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
232 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
235 #if !defined(WIN32) && !defined(UNDER_CE)
236 fd = rootwrap_bind (ptr->ai_family, socktype,
237 protocol ? protocol : ptr->ai_protocol,
238 ptr->ai_addr, ptr->ai_addrlen);
241 msg_Dbg (p_this, "got socket %d from rootwrap", fd);
246 msg_Err (p_this, "socket bind error (%m)");
251 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen))
253 if (net_Subscribe (p_this, fd, ptr->ai_addr, ptr->ai_addrlen))
269 if (listen (fd, INT_MAX))
271 msg_Err (p_this, "socket listen error (%m)");
277 int *nsockv = (int *)realloc (sockv, (sockc + 2) * sizeof (int));
280 nsockv[sockc++] = fd;
287 vlc_freeaddrinfo (res);
296 /*****************************************************************************
298 *****************************************************************************
299 * Reads from a network socket. Cancellation point.
300 * If waitall is true, then we repeat until we have read the right amount of
301 * data; in that case, a short count means EOF has been reached or the VLC
302 * object has been signaled.
303 *****************************************************************************/
305 __net_Read (vlc_object_t *restrict p_this, int fd, const v_socket_t *vs,
306 void *restrict p_buf, size_t i_buflen, bool waitall)
309 struct pollfd ufd[2] = {
310 { .fd = fd, .events = POLLIN },
311 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
315 return -1; /* vlc_object_waitpipe() sets errno */
319 ufd[0].revents = ufd[1].revents = 0;
321 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) < 0)
328 #ifndef POLLRDHUP /* This is nice but non-portable */
333 /* Errors (-1) and EOF (0) will be returned on next call,
334 * otherwise we'd "hide" the error from the caller, which is a
336 if (ufd[0].revents & (POLLERR|POLLNVAL|POLLRDHUP))
345 assert (p_this->b_die);
346 msg_Dbg (p_this, "socket %d polling interrupted", fd);
347 #if defined(WIN32) || defined(UNDER_CE)
348 WSASetLastError (WSAEINTR);
356 assert (ufd[0].revents);
361 int canc = vlc_savecancel ();
362 n = vs->pf_recv (vs->p_sys, p_buf, i_buflen);
363 vlc_restorecancel (canc);
368 n = recv (fd, p_buf, i_buflen, 0);
370 n = read (fd, p_buf, i_buflen);
376 #if defined(WIN32) || defined(UNDER_CE)
377 switch (WSAGetLastError ())
380 /* only happens with vs != NULL (TLS) - not really an error */
385 /* On Win32, recv() fails if the datagram doesn't fit inside
386 * the passed buffer, even though the buffer will be filled
387 * with the first part of the datagram. */
388 msg_Err (p_this, "Receive error: "
389 "Increase the mtu size (--mtu option)");
396 case EAGAIN: /* spurious wakeup or no TLS data */
397 #if (EAGAIN != EWOULDBLOCK)
400 case EINTR: /* asynchronous signal */
408 /* For streams, this means end of file, and there will not be any
409 * further data ever on the stream. For datagram sockets, this
410 * means empty datagram, and there could be more data coming.
411 * However, it makes no sense to set <waitall> with datagrams in the
417 p_buf = (char *)p_buf + n;
427 msg_Err (p_this, "Read error: %m");
433 /* Write exact amount requested */
434 ssize_t __net_Write( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
435 const void *restrict p_data, size_t i_data )
438 struct pollfd ufd[2] = {
439 { .fd = fd, .events = POLLOUT },
440 { .fd = vlc_object_waitpipe (p_this), .events = POLLIN },
450 ufd[0].revents = ufd[1].revents = 0;
452 if (poll (ufd, sizeof (ufd) / sizeof (ufd[0]), -1) == -1)
456 msg_Err (p_this, "Polling error: %m");
461 { /* If POLLHUP resp. POLLERR|POLLNVAL occurs while we have already
462 * read some data, it is important that we first return the number
463 * of bytes read, and then return 0 resp. -1 on the NEXT call. */
464 if (ufd[0].revents & (POLLHUP|POLLERR|POLLNVAL))
466 if (ufd[1].revents) /* VLC object signaled */
473 assert (p_this->b_die);
480 val = p_vs->pf_send (p_vs->p_sys, p_data, i_data);
483 val = send (fd, p_data, i_data, 0);
485 val = write (fd, p_data, i_data);
492 msg_Err (p_this, "Write error: %m");
496 p_data = (const char *)p_data + val;
501 if ((i_total > 0) || (i_data == 0))
509 * Reads a line from a file descriptor.
510 * This function is not thread-safe; the same file descriptor cI/O annot be read
511 * by another thread at the same time (although it can be written to).
513 * @return nul-terminated heap-allocated string, or NULL on I/O error.
515 char *__net_Gets( vlc_object_t *p_this, int fd, const v_socket_t *p_vs )
517 char *psz_line = NULL, *ptr = NULL;
518 size_t i_line = 0, i_max = 0;
523 if( i_line == i_max )
526 psz_line = realloc_or_free( psz_line, i_max );
528 ptr = psz_line + i_line;
531 if( net_Read( p_this, fd, p_vs, ptr, 1, true ) != 1 )
550 if( ( ptr >= psz_line ) && ( *ptr == '\r' ) )
556 ssize_t net_Printf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
557 const char *psz_fmt, ... )
561 va_start( args, psz_fmt );
562 i_ret = net_vaPrintf( p_this, fd, p_vs, psz_fmt, args );
568 ssize_t __net_vaPrintf( vlc_object_t *p_this, int fd, const v_socket_t *p_vs,
569 const char *psz_fmt, va_list args )
574 int i_size = vasprintf( &psz, psz_fmt, args );
577 i_ret = __net_Write( p_this, fd, p_vs, psz, i_size ) < i_size