src/nss-myhostname/legacy.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of nss-myhostname.
   5
   6   Copyright 2008-2011 Lennart Poettering
   7   Copyright 2011 Robert millan
   8
   9   nss-myhostname is free software; you can redistribute it and/or
  10   modify it under the terms of the GNU Lesser General Public License
  11   as published by the Free Software Foundation; either version 2.1 of
  12   the License, or (at your option) any later version.
  13
  14   nss-myhostname is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   Lesser General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public
  20   License along with nss-myhostname; If not, see
  21   <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24 #include <sys/types.h>
  25 #include <errno.h>
  26 #include <ifaddrs.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <netinet/in.h>
  30
  31 #include "ifconf.h"
  32
  33 int ifconf_acquire_addresses(struct address **_list, unsigned *_n_list) {
  34         struct address *list = NULL;
  35         unsigned n_list = 0;
  36         struct ifaddrs *ifa = NULL;
  37         int r = 1;
  38         struct ifaddrs *i;
  39         int ifindex = 0;
  40
  41         if (getifaddrs(&ifa) == -1) {
  42                 r = -errno;
  43                 goto finish;
  44         }
  45
  46         for (i = ifa; i != NULL; i = i->ifa_next) {
  47                 int af;
  48                 const void *cp;
  49                 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) i->ifa_addr;
  50                 struct sockaddr_in *in = (struct sockaddr_in *) i->ifa_addr;
  51
  52                 if (! i->ifa_addr)
  53                         continue;
  54
  55                 af = i->ifa_addr->sa_family;
  56
  57                 if (af != AF_INET && af != AF_INET6)
  58                         continue;
  59
  60                 list = realloc(list, (n_list+1) * sizeof(struct address));
  61                 if (!list) {
  62                         r = -ENOMEM;
  63                         goto finish;
  64                 }
  65
  66                 if (af == AF_INET6)
  67                         cp = &in6->sin6_addr;
  68                 else
  69                         cp = &in->sin_addr;
  70
  71                 list[n_list].family = af;
  72                 list[n_list].scope = 0;
  73                 memcpy(list[n_list].address, cp, PROTO_ADDRESS_SIZE(af));
  74                 list[n_list].ifindex = ifindex++;
  75                 n_list++;
  76         }
  77
  78 finish:
  79         if (ifa)
  80                 freeifaddrs(ifa);
  81
  82         if (r < 0)
  83                 free(list);
  84         else {
  85                 qsort(list, n_list, sizeof(struct address), address_compare);
  86
  87                 *_list = list;
  88                 *_n_list = n_list;
  89         }
  90
  91         return r;
  92 }