external/gpl2/xcvs/dist/lib/getaddrinfo.c

   1 /* Get address information (partial implementation).
   2    Copyright (C) 1997, 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
   3    Contributed by Simon Josefsson <simon@josefsson.org>.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22
  23 #include "getaddrinfo.h"
  24
  25 /* Get calloc. */
  26 #include <stdlib.h>
  27
  28 /* Get memcpy. */
  29 #include <string.h>
  30
  31 #include <stdbool.h>
  32
  33 #include "gettext.h"
  34 #define _(String) gettext (String)
  35 #define N_(String) String
  36
  37 #include "strdup.h"
  38
  39 static inline bool
  40 validate_family (int family)
  41 {
  42   /* FIXME: Support more families. */
  43 #if HAVE_IPV4
  44      if (family == PF_INET)
  45        return true;
  46 #endif
  47 #if HAVE_IPV6
  48      if (family == PF_INET6)
  49        return true;
  50 #endif
  51      if (family == PF_UNSPEC)
  52        return true;
  53      return false;
  54 }
  55
  56 /* Translate name of a service location and/or a service name to set of
  57    socket addresses. */
  58 int
  59 getaddrinfo (const char *restrict nodename,
  60              const char *restrict servname,
  61              const struct addrinfo *restrict hints,
  62              struct addrinfo **restrict res)
  63 {
  64   struct addrinfo *tmp;
  65   struct servent *se;
  66   struct hostent *he;
  67   size_t sinlen;
  68
  69   if (hints && (hints->ai_flags & ~AI_CANONNAME))
  70     /* FIXME: Support more flags. */
  71     return EAI_BADFLAGS;
  72
  73   if (hints && !validate_family (hints->ai_family))
  74     return EAI_FAMILY;
  75
  76   if (hints &&
  77       hints->ai_socktype != SOCK_STREAM && hints->ai_socktype != SOCK_DGRAM)
  78     /* FIXME: Support other socktype. */
  79     return EAI_SOCKTYPE; /* FIXME: Better return code? */
  80
  81   if (!nodename)
  82     /* FIXME: Support server bind mode. */
  83     return EAI_NONAME;
  84
  85   if (servname)
  86     {
  87       const char *proto =
  88         (hints && hints->ai_socktype == SOCK_DGRAM) ? "udp" : "tcp";
  89
  90       /* FIXME: Use getservbyname_r if available. */
  91       se = getservbyname (servname, proto);
  92
  93       if (!se)
  94         return EAI_SERVICE;
  95     }
  96
  97   /* FIXME: Use gethostbyname_r if available. */
  98   he = gethostbyname (nodename);
  99   if (!he || he->h_addr_list[0] == NULL)
 100     return EAI_NONAME;
 101
 102   switch (he->h_addrtype)
 103     {
 104 #if HAVE_IPV6
 105     case PF_INET6:
 106       sinlen = sizeof (struct sockaddr_in6);
 107       break;
 108 #endif
 109
 110 #if HAVE_IPV4
 111     case PF_INET:
 112       sinlen = sizeof (struct sockaddr_in);
 113       break;
 114 #endif
 115
 116     default:
 117       return EAI_NODATA;
 118     }
 119
 120   tmp = calloc (1, sizeof (*tmp) + sinlen);
 121   if (!tmp)
 122     return EAI_MEMORY;
 123
 124   switch (he->h_addrtype)
 125     {
 126 #if HAVE_IPV6
 127     case PF_INET6:
 128       {
 129         struct sockaddr_in6 *sinp = (char *) tmp + sizeof (*tmp);
 130
 131         if (se)
 132           sinp->sin6_port = se->s_port;
 133
 134         if (he->h_length != sizeof (sinp->sin6_addr))
 135           return EAI_SYSTEM; /* FIXME: Better return code?  Set errno? */
 136
 137         memcpy (&sinp->sin6_addr, he->h_addr_list[0], he->h_length);
 138
 139         tmp->ai_addr = (struct sockaddr *) sinp;
 140         tmp->ai_addrlen = sinlen;
 141       }
 142       break;
 143 #endif
 144
 145 #if HAVE_IPV4
 146     case PF_INET:
 147       {
 148         struct sockaddr_in *sinp = (char *) tmp + sizeof (*tmp);
 149
 150         if (se)
 151           sinp->sin_port = se->s_port;
 152
 153         if (he->h_length != sizeof (sinp->sin_addr))
 154           return EAI_SYSTEM; /* FIXME: Better return code?  Set errno? */
 155
 156         memcpy (&sinp->sin_addr, he->h_addr_list[0], he->h_length);
 157
 158         tmp->ai_addr = (struct sockaddr *) sinp;
 159         tmp->ai_addrlen = sinlen;
 160       }
 161       break;
 162 #endif
 163
 164     default:
 165       free (tmp);
 166       return EAI_NODATA;
 167     }
 168
 169   if (hints && hints->ai_flags & AI_CANONNAME)
 170     {
 171       const char *cn;
 172       if (he->h_name)
 173         cn = he->h_name;
 174       else
 175         cn = nodename;
 176
 177       tmp->ai_canonname = strdup (cn);
 178       if (!tmp->ai_canonname)
 179         {
 180           free (tmp);
 181           return EAI_MEMORY;
 182         }
 183     }
 184
 185   tmp->ai_protocol = (hints) ? hints->ai_protocol : 0;
 186   tmp->ai_socktype = (hints) ? hints->ai_socktype : 0;
 187   tmp->ai_addr->sa_family = he->h_addrtype;
 188
 189   /* FIXME: If more than one address, create linked list of addrinfo's. */
 190
 191   *res = tmp;
 192
 193   return 0;
 194 }
 195
 196 /* Free `addrinfo' structure AI including associated storage.  */
 197 void
 198 freeaddrinfo (struct addrinfo *ai)
 199 {
 200   while (ai)
 201     {
 202       struct addrinfo *cur;
 203
 204       cur = ai;
 205       ai = ai->ai_next;
 206
 207       if (cur->ai_canonname) free (cur->ai_canonname);
 208       free (cur);
 209     }
 210 }