/src/network/getaddrinfo.c
C | 191 lines | 114 code | 20 blank | 57 comment | 24 complexity | 7533d0a237294168186edfd9a1f54730 MD5 | raw file
- /*****************************************************************************
- * getaddrinfo.c: getaddrinfo/getnameinfo replacement functions
- *****************************************************************************
- * Copyright (C) 2005 VLC authors and VideoLAN
- * Copyright (C) 2002-2007 Rémi Denis-Courmont
- * $Id: 0d5cdf873792f36e0b29574145a777045c73535e $
- *
- * Author: Rémi Denis-Courmont <rem # videolan.org>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published by
- * the Free Software Foundation; either version 2.1 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_charset.h>
- #include <stddef.h> /* size_t */
- #include <string.h> /* strlen(), memcpy(), memset(), strchr() */
- #include <stdlib.h> /* malloc(), free(), strtoul() */
- #include <errno.h>
- #include <assert.h>
- #include <sys/types.h>
- #include <vlc_network.h>
- #ifndef AF_UNSPEC
- # define AF_UNSPEC 0
- #endif
- int vlc_getnameinfo( const struct sockaddr *sa, int salen,
- char *host, int hostlen, int *portnum, int flags )
- {
- char psz_servbuf[6], *psz_serv;
- int i_servlen, i_val;
- flags |= NI_NUMERICSERV;
- if( portnum != NULL )
- {
- psz_serv = psz_servbuf;
- i_servlen = sizeof( psz_servbuf );
- }
- else
- {
- psz_serv = NULL;
- i_servlen = 0;
- }
- i_val = getnameinfo(sa, salen, host, hostlen, psz_serv, i_servlen, flags);
- if( portnum != NULL )
- *portnum = atoi( psz_serv );
- return i_val;
- }
- /**
- * Resolves a host name to a list of socket addresses (like getaddrinfo()).
- *
- * @param p_this a VLC object
- * @param node host name to resolve (encoded as UTF-8), or NULL
- * @param i_port port number for the socket addresses
- * @param p_hints parameters (see getaddrinfo() manual page)
- * @param res pointer set to the resulting chained list.
- * @return 0 on success, a getaddrinfo() error otherwise.
- * On failure, *res is undefined. On success, it must be freed with
- * freeaddrinfo().
- */
- int vlc_getaddrinfo( vlc_object_t *p_this, const char *node,
- int i_port, const struct addrinfo *p_hints,
- struct addrinfo **res )
- {
- struct addrinfo hints;
- char psz_buf[NI_MAXHOST], psz_service[6];
- /*
- * In VLC, we always use port number as integer rather than strings
- * for historical reasons (and portability).
- */
- if( ( i_port > 65535 ) || ( i_port < 0 ) )
- {
- msg_Err( p_this, "invalid port number %d specified", i_port );
- return EAI_SERVICE;
- }
- /* cannot overflow */
- snprintf( psz_service, 6, "%d", i_port );
- /* Check if we have to force ipv4 or ipv6 */
- memset (&hints, 0, sizeof (hints));
- if (p_hints != NULL)
- {
- const int safe_flags =
- AI_PASSIVE |
- AI_CANONNAME |
- AI_NUMERICHOST |
- AI_NUMERICSERV |
- #ifdef AI_ALL
- AI_ALL |
- #endif
- #ifdef AI_ADDRCONFIG
- AI_ADDRCONFIG |
- #endif
- #ifdef AI_V4MAPPED
- AI_V4MAPPED |
- #endif
- 0;
- hints.ai_family = p_hints->ai_family;
- hints.ai_socktype = p_hints->ai_socktype;
- hints.ai_protocol = p_hints->ai_protocol;
- /* Unfortunately, some flags chang the layout of struct addrinfo, so
- * they cannot be copied blindly from p_hints to &hints. Therefore, we
- * only copy flags that we know for sure are "safe".
- */
- hints.ai_flags = p_hints->ai_flags & safe_flags;
- }
- /* We only ever use port *numbers* */
- hints.ai_flags |= AI_NUMERICSERV;
- /*
- * VLC extensions :
- * - accept "" as NULL
- * - ignore square brackets
- */
- if (node != NULL)
- {
- if (node[0] == '[')
- {
- size_t len = strlen (node + 1);
- if ((len <= sizeof (psz_buf)) && (node[len] == ']'))
- {
- assert (len > 0);
- memcpy (psz_buf, node + 1, len - 1);
- psz_buf[len - 1] = '\0';
- node = psz_buf;
- }
- }
- if (node[0] == '\0')
- node = NULL;
- }
- int ret;
- node = ToLocale (node);
- #ifdef WIN32
- /*
- * Winsock tries to resolve numerical IPv4 addresses as AAAA
- * and IPv6 addresses as A... There comes the bug-to-bug fix.
- */
- if ((hints.ai_flags & AI_NUMERICHOST) == 0)
- {
- hints.ai_flags |= AI_NUMERICHOST;
- ret = getaddrinfo (node, psz_service, &hints, res);
- if (ret == 0)
- goto out;
- hints.ai_flags &= ~AI_NUMERICHOST;
- }
- #endif
- #ifdef AI_IDN
- /* Run-time I18n Domain Names support */
- hints.ai_flags |= AI_IDN;
- ret = getaddrinfo (node, psz_service, &hints, res);
- if (ret != EAI_BADFLAGS)
- goto out;
- /* IDN not available: disable and retry without it */
- hints.ai_flags &= ~AI_IDN;
- #endif
- ret = getaddrinfo (node, psz_service, &hints, res);
- #if defined(AI_IDN) || defined(WIN32)
- out:
- #endif
- LocaleFree (node);
- return ret;
- }