src/libnetwork/phy.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 <stdio.h>
  23 #include <stdlib.h>
  24
  25 #include <network/libnetwork.h>
  26 #include <network/logging.h>
  27 #include "libnetwork-private.h"
  28
  29 struct network_phy {
  30         struct network_ctx* ctx;
  31         int refcount;
  32
  33         int index;
  34         char* name;
  35 };
  36
  37 static int phy_get_index(const char* name) {
  38         char path[1024];
  39         char index[8];
  40
  41         snprintf(path, sizeof(path), "/sys/class/ieee80211/%s/index", name);
  42
  43         FILE* f = fopen(path, "r");
  44         if (!f)
  45                 return -1;
  46
  47         int p = fread(index, 1, sizeof(index), f);
  48         if (p < 0) {
  49                 fclose(f);
  50                 return -1;
  51         }
  52
  53         // Terminate buffer
  54         index[p] = '\0';
  55         fclose(f);
  56
  57         return atoi(index);
  58 }
  59
  60 NETWORK_EXPORT int network_phy_new(struct network_ctx* ctx, struct network_phy** phy,
  61                 const char* name) {
  62         if (!name)
  63                 return -EINVAL;
  64
  65         int index = phy_get_index(name);
  66         if (index < 0)
  67                 return -ENODEV;
  68
  69         struct network_phy* p = calloc(1, sizeof(*p));
  70         if (!p)
  71                 return -ENOMEM;
  72
  73         // Initalise object
  74         p->ctx = network_ref(ctx);
  75         p->refcount = 1;
  76
  77         DEBUG(p->ctx, "Allocated phy at %p\n", p);
  78         *phy = p;
  79         return 0;
  80 }
  81
  82 NETWORK_EXPORT struct network_phy* network_phy_ref(struct network_phy* phy) {
  83         if (!phy)
  84                 return NULL;
  85
  86         phy->refcount++;
  87         return phy;
  88 }
  89
  90 static void network_phy_free(struct network_phy* phy) {
  91         DEBUG(phy->ctx, "Releasing phy at %p\n", phy);
  92
  93         if (phy->name)
  94                 free(phy->name);
  95
  96         network_unref(phy->ctx);
  97         free(phy);
  98 }
  99
 100 NETWORK_EXPORT struct network_phy* network_phy_unref(struct network_phy* phy) {
 101         if (!phy)
 102                 return NULL;
 103
 104         if (--phy->refcount > 0)
 105                 return phy;
 106
 107         network_phy_free(phy);
 108         return NULL;
 109 }