dabbad/list.c

   1 /**
   2  * \file list.c
   3  * \author written by Emmanuel Roullit emmanuel.roullit@gmail.com (c) 2012
   4  * \date 2012
   5  */
   6
   7 /* __LICENSE_HEADER_BEGIN__ */
   8
   9 /*
  10  * Copyright (C) 2012   Emmanuel Roullit <emmanuel.roullit@gmail.com>
  11  *
  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 (at
  15  * your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  19  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  20  * for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License along
  23  * with this program; if not, write to the Free Software Foundation, Inc.,
  24  * 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
  25  *
  26  */
  27
  28 /* __LICENSE_HEADER_END__ */
  29
  30 #include <stdio.h>
  31 #include <net/if.h>
  32 #include <sys/types.h>
  33 #include <ifaddrs.h>
  34 #include <libdabba/macros.h>
  35 #include <libdabba/strlcpy.h>
  36 #include <dabbad/list.h>
  37
  38 /**
  39  * \brief Get the list of usable interfaces by dabbad and give it to the user
  40  * \param[in,out]       msg             Dabba daemon IPC message
  41  * \return 0 on success, -1 if the interface list could not be fetched.
  42  *
  43  * This function only retrieves interfaces which belong to the packet family.
  44  */
  45
  46 int dabbad_ifconf_get(struct dabba_ipc_msg *msg)
  47 {
  48         size_t a, off, ifconf_size;
  49         struct ifaddrs *ifaddr, *ifa;
  50
  51         if (getifaddrs(&ifaddr) != 0)
  52                 return -1;
  53
  54         ifconf_size = ARRAY_SIZE(msg->msg_body.msg.ifconf);
  55         ifa = ifaddr;
  56
  57         for (off = 0; ifa && off < msg->msg_body.offset; ifa = ifa->ifa_next) {
  58                 if (!ifa->ifa_addr || ifa->ifa_addr->sa_family != AF_PACKET)
  59                         continue;
  60                 off++;
  61         }
  62
  63         for (a = 0; ifa && a < ifconf_size; ifa = ifa->ifa_next) {
  64                 if (!ifa->ifa_addr || ifa->ifa_addr->sa_family != AF_PACKET)
  65                         continue;
  66
  67                 strlcpy(msg->msg_body.msg.ifconf[a].name, ifa->ifa_name,
  68                         IFNAMSIZ);
  69                 a++;
  70         }
  71
  72         msg->msg_body.elem_nr = a;
  73         freeifaddrs(ifaddr);
  74         return 0;
  75 }