vcs.maemo.org Git - mtetherd/blob - net.c

   1 /*
   2   mtetherd
   3   (c) 2010 Gregor Riepl <onitake@gmail.com>
   4
   5   Tethering utility for Maemo
   6
   7   This program is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   This program is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include <string.h>
  22 #include <netinet/in.h>
  23 #include "net.h"
  24
  25 #define MTETHERD_DEVICE_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), TYPE_MTETHERD_DEVICE, MTetherDDevicePrivate))
  26
  27 G_DEFINE_TYPE(MTetherDDevice, mtetherd_device, G_TYPE_OBJECT);
  28
  29 // Host order 192.168.255.0
  30 static const in_addr_t HOST_BASE_ADDRESS = 0xc0a8ff00;
  31 // Host order 255.255.255.252
  32 static const in_addr_t HOST_NETMASK = 0xfffffffc;
  33 // Host order 0.0.0.2
  34 static const in_addr_t HOST_ROUTER = 0x00000002;
  35 // Host order 0.0.0.1
  36 static const in_addr_t HOST_DHCP = 0x00000001;
  37
  38 struct _MTetherDDevicePrivate {
  39         gchar *interface;
  40         gchar *udi;
  41         // Network order
  42         in_addr_t addr;
  43         in_addr_t netmask;
  44         in_addr_t dhcp_start;
  45         in_addr_t dhcp_end;
  46 };
  47
  48 static void mtetherd_device_finalize(GObject *object) {
  49         MTetherDDevice *self = MTETHERD_DEVICE(object);
  50
  51         if (self && self->priv) {
  52                 g_free(self->priv->interface);
  53                 g_free(self->priv->udi);
  54         }
  55 }
  56
  57 static void mtetherd_device_class_init(MTetherDDeviceClass *klass) {
  58         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
  59
  60         gobject_class->finalize = mtetherd_device_finalize;
  61         g_type_class_add_private(klass, sizeof(MTetherDDevicePrivate));
  62 }
  63
  64 static void mtetherd_device_init(MTetherDDevice *self) {
  65         self->priv = MTETHERD_DEVICE_GET_PRIVATE(self);
  66
  67         if (self->priv) {
  68                 self->priv->interface = NULL;
  69                 self->priv->udi = NULL;
  70                 self->priv->addr = 0;
  71                 self->priv->netmask = 0;
  72                 self->priv->dhcp_start = 0;
  73                 self->priv->dhcp_end = 0;
  74         }
  75 }
  76
  77 static void mtetherd_device_set_interface(MTetherDDevice *self, const gchar *interface) {
  78         if (self) {
  79                 if (self->priv->interface) {
  80                         g_free(self->priv->interface);
  81                 }
  82                 if (interface) {
  83                         size_t len = strlen(interface);
  84                         self->priv->interface = g_malloc(len + 1);
  85                         size_t i, j;
  86                         for (i = 0, j = 0; i < len; i++) {
  87                                 if (g_ascii_isalnum(interface[i])) {
  88                                         self->priv->interface[j] = interface[i];
  89                                         j++;
  90                                 }
  91                         }
  92                         self->priv->interface[j] = '\0';
  93                 }
  94         }
  95 }
  96
  97 static void mtetherd_device_set_udi(MTetherDDevice *self, const gchar *udi) {
  98         if (self) {
  99                 if (self->priv->udi) {
 100                         g_free(self->priv->udi);
 101                 }
 102                 if (udi) {
 103                         size_t len = strlen(udi);
 104                         self->priv->udi = g_malloc(len + 1);
 105                         size_t i, j;
 106                         for (i = 0, j = 0; i < len; i++) {
 107                                 if (g_ascii_isalnum(udi[i]) || g_ascii_ispunct(udi[i])) {
 108                                         self->priv->udi[j] = udi[i];
 109                                         j++;
 110                                 }
 111                         }
 112                         self->priv->udi[j] = '\0';
 113                 }
 114         }
 115 }
 116
 117 static void mtetherd_device_set_index(MTetherDDevice *self, guint index) {
 118         if (self && self->priv) {
 119                 // Maximum is 63, we need four addresses per subnet
 120                 if (index < 64) {
 121                         in_addr_t subnet = HOST_BASE_ADDRESS | (index << 2);
 122                         in_addr_t addr = subnet | HOST_ROUTER;
 123                         in_addr_t start = subnet | HOST_DHCP;
 124                         self->priv->addr = htonl(addr);
 125                         self->priv->netmask = htonl(HOST_NETMASK);
 126                         self->priv->dhcp_start = htonl(start);
 127                         self->priv->dhcp_end = htonl(addr);
 128                 } else {
 129                         g_warning("Invalid subnet index: %u (0..63 expected)", index);
 130                 }
 131         }
 132 }
 133
 134 MTetherDDevice *mtetherd_device_new(const gchar *interface, const gchar *udi, guint index) {
 135         MTetherDDevice *self = MTETHERD_DEVICE(g_object_new(TYPE_MTETHERD_DEVICE, NULL));
 136
 137         if (self && self->priv) {
 138                 mtetherd_device_set_interface(self, interface);
 139                 mtetherd_device_set_udi(self, udi);
 140                 mtetherd_device_set_index(self, index);
 141         }
 142
 143         return self;
 144 }
 145
 146 static gint mtetherd_device_find_udi(gconstpointer a, gconstpointer b) {
 147         const MTetherDDevice *self = MTETHERD_DEVICE(a);
 148         const gchar *udi = (const gchar *) b;
 149
 150         if (self && udi) {
 151                 if (g_strcmp0(self->priv->udi, udi) == 0) {
 152                         return 0;
 153                 }
 154         }
 155         return -1;
 156 }
 157
 158 MTetherDDevice *mtetherd_device_find(GList *list, const gchar *udi) {
 159         GList *entry = g_list_find_custom(list, udi, mtetherd_device_find_udi);
 160         if (entry) {
 161                 return MTETHERD_DEVICE(entry->data);
 162         }
 163         return NULL;
 164 }
 165