src/libnetwork/interface.c

   1 /*#############################################################################
   2 #                                                                             #
   3 # IPFire.org - A linux based firewall                                         #
   4 # Copyright (C) 2018 IPFire Network Development Team                          #
   5 #                                                                             #
   6 # This program is free software: you can redistribute it and/or modify        #
   7 # it under the terms of the GNU General Public License as published by        #
   8 # the Free Software Foundation, either version 3 of the License, or           #
   9 # (at your option) any later version.                                         #
  10 #                                                                             #
  11 # This program is distributed in the hope that it will be useful,             #
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  14 # GNU General Public License for more details.                                #
  15 #                                                                             #
  16 # You should have received a copy of the GNU General Public License           #
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  18 #                                                                             #
  19 #############################################################################*/
  20
  21 #include <errno.h>
  22 #include <net/if.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include <network/interface.h>
  27 #include <network/libnetwork.h>
  28 #include <network/logging.h>
  29 #include "libnetwork-private.h"
  30
  31 struct network_interface {
  32         struct network_ctx* ctx;
  33         int refcount;
  34
  35         unsigned int index;
  36         char* name;
  37 };
  38
  39 NETWORK_EXPORT int network_interface_new(struct network_ctx* ctx,
  40                 struct network_interface** intf, const char* name) {
  41         if (!name)
  42                 return -EINVAL;
  43
  44         unsigned int index = if_nametoindex(name);
  45         if (!index) {
  46                 ERROR(ctx, "Could not find interface %s\n", name);
  47                 return -ENODEV;
  48         }
  49
  50         struct network_interface* i = calloc(1, sizeof(*i));
  51         if (!i)
  52                 return -ENOMEM;
  53
  54         // Initialise object
  55         i->ctx = network_ref(ctx);
  56         i->refcount = 1;
  57         i->index = index;
  58         i->name = strdup(name);
  59
  60         DEBUG(i->ctx, "Allocated network interface at %p\n", i);
  61
  62         *intf = i;
  63         return 0;
  64 }
  65
  66 NETWORK_EXPORT struct network_interface* network_interface_ref(struct network_interface* intf) {
  67         if (!intf)
  68                 return NULL;
  69
  70         intf->refcount++;
  71         return intf;
  72 }
  73
  74 static void network_interface_free(struct network_interface* intf) {
  75         DEBUG(intf->ctx, "Released network interface at %p\n", intf);
  76
  77         if (intf->name)
  78                 free(intf->name);
  79
  80         network_unref(intf->ctx);
  81         free(intf);
  82 }
  83
  84 NETWORK_EXPORT struct network_interface* network_interface_unref(struct network_interface* intf) {
  85         if (!intf)
  86                 return NULL;
  87
  88         if (--intf->refcount > 0)
  89                 return intf;
  90
  91         network_interface_free(intf);
  92         return NULL;
  93 }
  94
  95 NETWORK_EXPORT const char* network_interface_get_name(struct network_interface* intf) {
  96         return intf->name;
  97 }