src/network/getaddrinfo.c

   1 /*****************************************************************************
   2  * getaddrinfo.c: getaddrinfo/getnameinfo replacement functions
   3  *****************************************************************************
   4  * Copyright (C) 2005 VLC authors and VideoLAN
   5  * Copyright (C) 2002-2007 Rémi Denis-Courmont
   6  * $Id$
   7  *
   8  * Author: Rémi Denis-Courmont <rem # videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 #ifdef HAVE_CONFIG_H
  26 # include "config.h"
  27 #endif
  28
  29 #include <vlc_common.h>
  30
  31 #include <stddef.h> /* size_t */
  32 #include <string.h> /* strlen(), memcpy(), memset(), strchr() */
  33 #include <stdlib.h> /* malloc(), free(), strtoul() */
  34 #include <errno.h>
  35 #include <assert.h>
  36
  37 #include <sys/types.h>
  38 #include <vlc_network.h>
  39
  40 int vlc_getnameinfo( const struct sockaddr *sa, int salen,
  41                      char *host, int hostlen, int *portnum, int flags )
  42 {
  43     char psz_servbuf[6], *psz_serv;
  44     int i_servlen, i_val;
  45
  46     flags |= NI_NUMERICSERV;
  47     if( portnum != NULL )
  48     {
  49         psz_serv = psz_servbuf;
  50         i_servlen = sizeof( psz_servbuf );
  51     }
  52     else
  53     {
  54         psz_serv = NULL;
  55         i_servlen = 0;
  56     }
  57
  58     i_val = getnameinfo(sa, salen, host, hostlen, psz_serv, i_servlen, flags);
  59
  60     if( portnum != NULL )
  61         *portnum = atoi( psz_serv );
  62
  63     return i_val;
  64 }
  65
  66
  67 /**
  68  * Resolves a host name to a list of socket addresses (like getaddrinfo()).
  69  *
  70  * @param node host name to resolve (encoded as UTF-8), or NULL
  71  * @param i_port port number for the socket addresses
  72  * @param p_hints parameters (see getaddrinfo() manual page)
  73  * @param res pointer set to the resulting chained list.
  74  * @return 0 on success, a getaddrinfo() error otherwise.
  75  * On failure, *res is undefined. On success, it must be freed with
  76  * freeaddrinfo().
  77  */
  78 int vlc_getaddrinfo (const char *node, unsigned port,
  79                      const struct addrinfo *hints, struct addrinfo **res)
  80 {
  81     char hostbuf[NI_MAXHOST], portbuf[6], *servname;
  82
  83     /*
  84      * In VLC, we always use port number as integer rather than strings
  85      * for historical reasons (and portability).
  86      */
  87     if (port != 0)
  88     {
  89         if (port > 65535)
  90             return EAI_SERVICE;
  91         /* cannot overflow */
  92         snprintf (portbuf, sizeof (portbuf), "%u", port);
  93         servname = portbuf;
  94     }
  95     else
  96         servname = NULL;
  97
  98     /*
  99      * VLC extensions :
 100      * - accept the empty string as unspecified host (i.e. NULL)
 101      * - ignore square brackets (for IPv6 numerals)
 102      */
 103     if (node != NULL)
 104     {
 105         if (node[0] == '[')
 106         {
 107             size_t len = strlen (node + 1);
 108             if ((len <= sizeof (hostbuf)) && (node[len] == ']'))
 109             {
 110                 assert (len > 0);
 111                 memcpy (hostbuf, node + 1, len - 1);
 112                 hostbuf[len - 1] = '\0';
 113                 node = hostbuf;
 114             }
 115         }
 116         if (node[0] == '\0')
 117             node = NULL;
 118     }
 119
 120     return getaddrinfo (node, servname, hints, res);
 121 }
 122
 123 #if defined (_WIN32) || defined (__OS2__) \
 124  || defined (__ANDROID__) || defined (__APPLE__) \
 125  || defined (__native_client__)
 126 #warning vlc_getaddr_info_i11e() not implemented!
 127 int vlc_getaddrinfo_i11e(const char *node, unsigned port,
 128                          const struct addrinfo *hints, struct addrinfo **res)
 129 {
 130     return vlc_getaddrinfo(node, port, hints, res);
 131 }
 132 #endif