src/vpnsvc-internal.c

   1 /*
   2  * Network Configuration - VPN Service Internal Module
   3  *
   4  * Copyright (c) 2015 Samsung Electronics Co., Ltd. All rights reserved.
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  * http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  */
  19
  20
  21 #include <errno.h>
  22 #include <net/route.h>
  23 #include <glib.h>
  24 #include <gio/gio.h>
  25 #include <sys/socket.h>
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <sys/ioctl.h>
  29 #include <sys/un.h>
  30 #include <arpa/inet.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <linux/if.h>
  34 #include <linux/if_tun.h>
  35
  36 #include "vpnsvc-internal.h"
  37 #include "log.h"
  38 #include "util.h"
  39
  40 #define BUF_SIZE_FOR_CMD 1024
  41 #define BUF_SIZE_FOR_ERR 100
  42
  43 #define CONNMAN_SERVICE "net.connman"
  44 #define CONNMAN_INTERFACE_MANAGER "net.connman.Manager"
  45 #define CONNMAN_INTERFACE_SERVICE "net.connman.Service"
  46
  47
  48 /* for iptables */
  49 static char iptables_cmd[] = "/usr/sbin/iptables";
  50 static char iptables_filter_prefix[] = "CAPI_VPN_SERVICE_";
  51 static char iptables_filter_out[] = "OUTPUT";
  52 static char iptables_filter_in[] = "INPUT";
  53 static char iptables_filter_interface_wlan[] = "wlan0";
  54 static char iptables_nat_chain_name[] = "CAPI_VPN_SERVICE_NAT_OUTPUT";
  55
  56 #define IPTABLES_FMT_CREATE_CHAIN "%s -N %s%s -w"
  57 #define IPTABLES_FMT_APPEND_DROP_RULE "%s -A %s%s -j DROP -w"
  58 #define IPTABLES_FMT_APPEND_RETURN_RULE "%s -A %s%s -j RETURN -w"
  59 #define IPTABLES_FMT_INSERT_RULE "%s -I %s -j %s%s -w"
  60 #define IPTABLES_FMT_DEL_RULE "%s -D %s -j %s%s -w"
  61 #define IPTABLES_FMT_FLUSH_CHAIN "%s -F %s%s -w"
  62 #define IPTABLES_FMT_DEL_CHAIN "%s -X %s%s -w"
  63 #define IPTABLES_FMT_APPEND_ACCEPT_RULE "%s -%c %s%s -%c %s/%d -j ACCEPT -w"
  64 #define IPTABLES_FMT_APPEND_ACCEPT_RULE_WITH_INTF "%s -%c %s%s -%c %s -%c %s/%d -j ACCEPT -w"
  65 #define IPTABLES_FMT_DEL_RULE_FROM_NAT "%s -t nat -D %s -j %s -w"
  66 #define IPTABLES_FMT_FLUSH_CHAIN_FROM_NAT "%s -t nat -F %s -w"
  67 #define IPTABLES_FMT_DEL_CHAIN_FROM_NAT "%s -t nat -X %s -w"
  68
  69 /*static char iptables_usage_fmt[] = "%s -L %s%s -n -v -w;";*/
  70 /* iptables -t nat -A CAPI_VPN_SERVICE_OUTPUT -p udp -d <vpn dns address> --dport 53 -j DNAT --to <vpn defice address:53> */
  71
  72 typedef unsigned long int ipv4; /* Declare variable type for ipv4 net address. */
  73
  74 static GDBusConnection *global_connection = NULL;
  75
  76 static ipv4 make_mask(int prefix)
  77 {
  78         ipv4 mask = 0;
  79         int i = 0;
  80
  81         for (i = prefix; i > 0; i--)
  82                 mask += (ipv4) (1 << (32 - i));
  83         return mask;
  84 }
  85
  86 static in_addr_t host2net(ipv4 host)
  87 {
  88         in_addr_t net;
  89
  90         net = 0;
  91
  92         net |= (host & 0x000000FF) << 24;
  93         net |= (host & 0x0000FF00) <<  8;
  94         net |= (host & 0x00FF0000) >>  8;
  95         net |= (host & 0xFF000000) >> 24;
  96
  97         return net;
  98 }
  99
 100 static void connman_connection_open(void)
 101 {
 102         if (global_connection == NULL) {
 103                 GError *error = NULL;
 104 #if !GLIB_CHECK_VERSION(2, 36, 0)
 105                 g_type_init();
 106 #endif
 107
 108                 global_connection = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error);
 109                 if (global_connection == NULL) {
 110                         if (error != NULL) {
 111                                 ERR("Error connman connection open: %s", error->message);
 112                                 g_error_free(error);
 113                         }
 114                 }
 115         }
 116 }
 117
 118 static void connman_connection_close(GDBusConnection *connection)
 119 {
 120         if (connection)
 121                 g_object_unref(connection);
 122 }
 123
 124 static GVariant *connman_method_call(
 125         GDBusConnection *connection, char *service, char *path,
 126         char *interface, char *method, GVariant *params)
 127 {
 128         GError *error = NULL;
 129         GVariant *message = NULL;
 130
 131         message = g_dbus_connection_call_sync(
 132                 connection, service, path, interface, method, params,
 133                 NULL, G_DBUS_CALL_FLAGS_NONE, -1, NULL, &error);
 134
 135         if (message == NULL) {
 136                 if (error != NULL) {
 137                         ERR("error: g_dbus_connection_call_sync [%d: %s]", error->code, error->message);
 138                         g_error_free(error);
 139                 } else {
 140                         ERR("error: g_dbus_connection_call_sync\n");
 141                 }
 142         }
 143
 144         return message;
 145 }
 146
 147 static char *connman_default_profile(GDBusConnection *connection)
 148 {
 149         gchar *key = NULL;
 150         GVariantIter *value = NULL;
 151         GVariant *message = NULL;
 152         GVariantIter *iter = NULL;
 153         char *profile = NULL;
 154
 155         message = connman_method_call(connection, CONNMAN_SERVICE, "/",
 156                                                                   CONNMAN_INTERFACE_MANAGER, "GetServices", NULL);
 157
 158         if (message) {
 159                 g_variant_get(message, "(a(oa{sv}))", &iter);
 160                 while (g_variant_iter_loop(iter, "(oa{sv})", &key, &value)) {
 161                         profile = strdup(key);
 162                         break;
 163                 }
 164
 165                 if (value)
 166                         g_variant_iter_free(value);
 167                 if (key)
 168                         g_free(key);
 169
 170                 g_variant_iter_free(iter);
 171                 g_variant_unref(message);
 172         }
 173
 174         return profile;
 175 }
 176
 177 #if 0
 178 static char *connman_get_items(GDBusConnection *connection, char *profile, const char *keystr)
 179 {
 180         GVariant *message = NULL;
 181         GVariantIter *iter = NULL;
 182         GVariantIter *next = NULL;
 183         gchar *obj = NULL;
 184         char *items = NULL;
 185
 186         message = connman_method_call(connection, CONNMAN_SERVICE, "/",
 187                                                                   CONNMAN_INTERFACE_MANAGER, "GetServices", NULL);
 188
 189         if (message) {
 190                 g_variant_get(message, "(a(oa{sv}))", &iter);
 191                 while (g_variant_iter_loop(iter, "(oa{sv})", &obj, &next)) {
 192                         if (strcmp(obj, profile) == 0) {
 193                                 GVariant *var;
 194                                 gchar *key;
 195
 196                                 while (g_variant_iter_loop(next, "{sv}", &key, &var)) {
 197                                         if (g_strcmp0(key, keystr) == 0) {
 198                                                 GVariantIter *iter_item;
 199                                                 const gchar *value = NULL;
 200
 201                                                 g_variant_get(var, "as", &iter_item);
 202                                                 while (g_variant_iter_loop(iter_item, "s", &value)) {
 203                                                         if (items) {
 204                                                                 char *tmp_items;
 205
 206                                                                 tmp_items = (char *) malloc(strlen(items) + 1 + strlen(value) + 1);
 207                                                                 if (items) {
 208                                                                         snprintf(tmp_items, strlen(tmp_items), "%s,%s", items, value);
 209                                                                         free(items);
 210                                                                         items = tmp_items;
 211                                                                 }
 212                                                         } else {
 213                                                                 items = strdup(value);
 214                                                         }
 215                                                 }
 216                                                 g_variant_iter_free(iter_item);
 217                                                 break;
 218                                         }
 219                                 }
 220                                 break;
 221                         }
 222                 }
 223                 g_variant_iter_free(iter);
 224                 g_variant_unref(message);
 225         }
 226
 227         return items;
 228 }
 229 #endif
 230
 231 static void connman_set_items(GDBusConnection *connection, char *profile,
 232                                                           const char *keystr, char *items)
 233 {
 234         GVariant *message = NULL;
 235         GVariantBuilder *builder = NULL;
 236         GVariant *params = NULL;
 237         char *strings = strdup(items);
 238         char *addr = NULL;
 239         char *temp = NULL;
 240
 241         builder = g_variant_builder_new(G_VARIANT_TYPE("as"));
 242         if ((addr = strtok_r(strings, ", ", &temp)) != NULL) {
 243                 do {
 244                         g_variant_builder_add(builder, "s", addr);
 245                 } while ((addr = strtok_r(NULL, ", ", &temp)) != NULL);
 246         }
 247         free(strings);
 248         params = g_variant_new("(sv)", keystr,
 249                                                    g_variant_builder_end(builder));
 250         g_variant_builder_unref(builder);
 251
 252         message = connman_method_call(connection, CONNMAN_SERVICE, profile,
 253                                                                   CONNMAN_INTERFACE_SERVICE, "SetProperty", params);
 254         if (message)
 255                 g_variant_unref(message);
 256
 257 }
 258
 259 #if 0
 260 static char *connman_get_nameservers(GDBusConnection *connection, char *profile)
 261 {
 262         return connman_get_items(connection, profile, "Nameservers");
 263 }
 264
 265 static char *connman_get_nameservers_conf(GDBusConnection *connection, char *profile)
 266 {
 267         return connman_get_items(connection, profile, "Nameservers.Configuration");
 268 }
 269 #endif
 270
 271 static void connman_set_nameservers(GDBusConnection *connection, char *profile,
 272                                                                         char *nameservers)
 273 {
 274         return connman_set_items(connection, profile,
 275                                                          "Nameservers.Configuration", nameservers);
 276 }
 277
 278 #if 0
 279 static char *connman_get_domains(GDBusConnection *connection, char *profile)
 280 {
 281         return connman_get_items(connection, profile, "Domains");
 282 }
 283
 284 static char *connman_get_domains_conf(GDBusConnection *connection, char *profile)
 285 {
 286         return connman_get_items(connection, profile, "Domains.Configuration");
 287 }
 288 #endif
 289
 290 static void connman_set_domains(GDBusConnection *connection, char *profile,
 291                                                                         char *domains)
 292 {
 293         return connman_set_items(connection, profile,
 294                                                          "Domains.Configuration", domains);
 295 }
 296
 297 #if 0
 298 static int add_dns_servers(char** dns_servers, size_t nr_dns, size_t total_dns_string_cnt)
 299 {
 300         char *profile = NULL;
 301         char *items = NULL;
 302         char *org_items = NULL;
 303         char *new_items = NULL;
 304         unsigned int i = 0;
 305
 306         connman_connection_open();
 307
 308         profile = connman_default_profile(global_connection);
 309         if (profile == NULL) {
 310                 ERR("connman_default_profile failed");
 311                 connman_connection_close(global_connection);
 312                 return VPNSVC_ERROR_IPC_FAILED;
 313         }
 314
 315         DBG("profile : %s\n", profile);
 316
 317         /* add name servers */
 318         org_items = connman_get_nameservers(global_connection, profile);
 319
 320         if (org_items) {
 321                 DBG("original DNS : %s\n", org_items);
 322                 /* nr_dns = comma(,) count */
 323                 items = (char *) calloc((total_dns_string_cnt + nr_dns + strlen(org_items) + 1), sizeof(char));
 324                 if (items == NULL) {
 325                         ERR("OOM while malloc\n");
 326                         return VPNSVC_ERROR_OUT_OF_MEMORY;
 327                 }
 328                 strncpy(items, org_items, strlen(org_items));
 329                 for (i = 0 ; i < nr_dns ; i++) {
 330                         strncat(items, ",", 1);
 331                         strncat(items, dns_servers[i], strlen(dns_servers[i]));
 332                 }
 333                 free(org_items);
 334                 org_items = NULL;
 335         } else {
 336                 /* nr_dns = comma(,) count + end null char */
 337                 items = (char *) calloc(total_dns_string_cnt + nr_dns, sizeof(char));
 338                 if (items == NULL) {
 339                         ERR("OOM while malloc\n");
 340                         return VPNSVC_ERROR_OUT_OF_MEMORY;
 341                 }
 342                 for (i = 0 ; i < nr_dns ; i++) {
 343                         strncat(items, dns_servers[i], strlen(dns_servers[i]));
 344                         if (i != nr_dns - 1)
 345                                 strncat(items, ",", 1);
 346                 }
 347         }
 348
 349         if (items) {
 350                 DBG("adding DNS : %s\n", items);
 351                 connman_set_nameservers(global_connection, profile, items);
 352                 free(items);
 353                 items = NULL;
 354         }
 355
 356         /* print new DNSs */
 357         new_items = connman_get_nameservers_conf(global_connection, profile);
 358         DBG("new_dns : %s\n", new_items);
 359
 360         if (new_items)
 361                 free(new_items);
 362         free(profile);
 363         return VPNSVC_ERROR_NONE;
 364 }
 365 #endif
 366
 367 static int del_dns_servers()
 368 {
 369         char *profile = NULL;
 370
 371         connman_connection_open();
 372
 373         profile = connman_default_profile(global_connection);
 374         if (profile == NULL) {
 375                 ERR("connman_default_profile failed");
 376                 connman_connection_close(global_connection);
 377                 return VPNSVC_ERROR_IPC_FAILED;
 378         }
 379
 380         DBG("profile : %s", profile);
 381
 382         /* del name servers */
 383         connman_set_nameservers(global_connection, profile, "");
 384
 385         if (profile)
 386                 free(profile);
 387
 388         return VPNSVC_ERROR_NONE;
 389 }
 390
 391 #if 0
 392 static int add_dns_suffix(const char* dns_suffix, size_t dns_suffix_len)
 393 {
 394         char *profile = NULL;
 395         char *items = NULL;
 396         char *org_items = NULL;
 397         char *new_items = NULL;
 398
 399         connman_connection_open();
 400
 401         profile = connman_default_profile(global_connection);
 402         if (profile == NULL) {
 403                 ERR("connman_default_profile failed");
 404                 connman_connection_close(global_connection);
 405                 return VPNSVC_ERROR_IPC_FAILED;
 406         }
 407
 408         DBG("profile : %s", profile);
 409
 410         /* add name servers */
 411         org_items = connman_get_domains(global_connection, profile);
 412
 413         if (org_items) {
 414                 DBG("original DNS suffix : %s", org_items);
 415                 /* comma(,) and end null character included */
 416                 items = (char *) calloc((dns_suffix_len + strlen(org_items) + 2), sizeof(char));
 417                 if (items == NULL) {
 418                         ERR("OOM while malloc");
 419                         return VPNSVC_ERROR_OUT_OF_MEMORY;
 420                 }
 421                 strncpy(items, org_items, strlen(org_items));
 422                 strncat(items, ",", 1);
 423                 strncat(items, dns_suffix, dns_suffix_len);
 424                 free(org_items);
 425                 org_items = NULL;
 426         } else {
 427                 /* nr_dns = comma(,) count + end null char */
 428                 items = (char *) calloc((dns_suffix_len + 1), sizeof(char));
 429                 if (items == NULL) {
 430                         ERR("OOM while malloc");
 431                         return VPNSVC_ERROR_OUT_OF_MEMORY;
 432                 }
 433                 strncat(items, dns_suffix, dns_suffix_len);
 434         }
 435
 436         if (items) {
 437                 DBG("adding DNS suffix : %s\n", items);
 438                 connman_set_domains(global_connection, profile, items);
 439                 free(items);
 440                 items = NULL;
 441         }
 442
 443         /* print new domains */
 444         new_items = connman_get_domains_conf(global_connection, profile);
 445         DBG("new DNS suffix : %s\n", new_items);
 446
 447         if (new_items)
 448                 free(new_items);
 449
 450         if (profile)
 451                 free(profile);
 452
 453         return VPNSVC_ERROR_NONE;
 454 }
 455 #endif
 456
 457 static int del_dns_suffix()
 458 {
 459         char *profile = NULL;
 460
 461         connman_connection_open();
 462
 463         profile = connman_default_profile(global_connection);
 464         if (profile == NULL) {
 465                 ERR("connman_default_profile failed");
 466                 connman_connection_close(global_connection);
 467                 return VPNSVC_ERROR_IPC_FAILED;
 468         }
 469
 470         DBG("profile : %s", profile);
 471
 472         /* del DNS suffix */
 473         connman_set_domains(global_connection, profile, "");
 474
 475         if (profile)
 476                 free(profile);
 477
 478         return VPNSVC_ERROR_NONE;
 479 }
 480
 481 #if 0
 482 static void dns_nat_register(char **vpn_dns_address, size_t nr_dns, char *vpn_device_address)
 483 {
 484         int size = 0, i;
 485         char buf[8192];
 486
 487         snprintf(buf + size, sizeof(buf) - size, iptables_nat_register_init_fmt,
 488                         iptables_cmd, iptables_nat_chain_name,
 489                         iptables_cmd, iptables_nat_chain_name,
 490                         iptables_cmd, iptables_filter_out, iptables_nat_chain_name);
 491         size = strlen(buf);
 492
 493         for (i = 0 ; i < nr_dns ; i++) {
 494                 snprintf(buf + size, sizeof(buf) - size, iptables_nat_register_rule_fmt,
 495                                 iptables_cmd, iptables_nat_chain_name, vpn_dns_address[i], vpn_device_address);
 496                 size = strlen(buf);
 497         }
 498         DBG("iptable dns nat reg cmd : %s", buf);
 499         iptables_exec(buf);
 500 }
 501 #endif
 502
 503 static void dns_nat_unregister(void)
 504 {
 505         char buf[BUF_SIZE_FOR_CMD];
 506
 507         snprintf(buf, sizeof(buf), IPTABLES_FMT_DEL_RULE_FROM_NAT,
 508                         iptables_cmd, iptables_filter_out, iptables_nat_chain_name);
 509         if (netconfig_execute_cmd(buf))
 510                 ERR("Failed to execute command: %s", buf);
 511
 512         memset(buf, '0', sizeof(buf));
 513         snprintf(buf, sizeof(buf), IPTABLES_FMT_FLUSH_CHAIN_FROM_NAT,
 514                         iptables_cmd, iptables_nat_chain_name);
 515         if (netconfig_execute_cmd(buf))
 516                 ERR("Failed to execute command: %s", buf);
 517
 518         memset(buf, '0', sizeof(buf));
 519         snprintf(buf, sizeof(buf), IPTABLES_FMT_DEL_CHAIN_FROM_NAT,
 520                         iptables_cmd, iptables_nat_chain_name);
 521         if (netconfig_execute_cmd(buf))
 522                 ERR("Failed to execute command: %s", buf);
 523 }
 524
 525 static void iptables_register(void)
 526 {
 527         char buf[BUF_SIZE_FOR_CMD] = {0, };
 528         char *filter;
 529
 530         filter = iptables_filter_out;
 531
 532         snprintf(buf, sizeof(buf), IPTABLES_FMT_CREATE_CHAIN,
 533                         iptables_cmd, iptables_filter_prefix, filter);
 534         if (netconfig_execute_cmd(buf))
 535                 ERR("Failed to execute command: %s", buf);
 536
 537         memset(buf, '0', sizeof(buf));
 538         snprintf(buf, sizeof(buf), IPTABLES_FMT_FLUSH_CHAIN,
 539                         iptables_cmd, iptables_filter_prefix, filter);
 540         if (netconfig_execute_cmd(buf))
 541                 ERR("Failed to execute command: %s", buf);
 542
 543         memset(buf, '0', sizeof(buf));
 544         snprintf(buf, sizeof(buf), IPTABLES_FMT_APPEND_DROP_RULE,
 545                         iptables_cmd, iptables_filter_prefix, filter);
 546         if (netconfig_execute_cmd(buf))
 547                 ERR("Failed to execute command: %s", buf);
 548
 549         memset(buf, '0', sizeof(buf));
 550         snprintf(buf, sizeof(buf), IPTABLES_FMT_APPEND_RETURN_RULE,
 551                         iptables_cmd, iptables_filter_prefix, filter);
 552         if (netconfig_execute_cmd(buf))
 553                 ERR("Failed to execute command: %s", buf);
 554
 555         memset(buf, '0', sizeof(buf));
 556         snprintf(buf, sizeof(buf), IPTABLES_FMT_INSERT_RULE,
 557                         iptables_cmd, filter, iptables_filter_prefix, filter);
 558
 559         filter = iptables_filter_in;
 560
 561         memset(buf, '0', sizeof(buf));
 562         snprintf(buf, sizeof(buf), IPTABLES_FMT_CREATE_CHAIN,
 563                         iptables_cmd, iptables_filter_prefix, filter);
 564         if (netconfig_execute_cmd(buf))
 565                 ERR("Failed to execute command: %s", buf);
 566
 567         memset(buf, '0', sizeof(buf));
 568         snprintf(buf, sizeof(buf), IPTABLES_FMT_FLUSH_CHAIN,
 569                         iptables_cmd, iptables_filter_prefix, filter);
 570         if (netconfig_execute_cmd(buf))
 571                 ERR("Failed to execute command: %s", buf);
 572
 573         memset(buf, '0', sizeof(buf));
 574         snprintf(buf, sizeof(buf), IPTABLES_FMT_APPEND_DROP_RULE,
 575                         iptables_cmd, iptables_filter_prefix, filter);
 576         if (netconfig_execute_cmd(buf))
 577                 ERR("Failed to execute command: %s", buf);
 578
 579         memset(buf, '0', sizeof(buf));
 580         snprintf(buf, sizeof(buf), IPTABLES_FMT_APPEND_RETURN_RULE,
 581                         iptables_cmd, iptables_filter_prefix, filter);
 582         if (netconfig_execute_cmd(buf))
 583                 ERR("Failed to execute command: %s", buf);
 584
 585         memset(buf, '0', sizeof(buf));
 586         snprintf(buf, sizeof(buf), IPTABLES_FMT_INSERT_RULE,
 587                         iptables_cmd, filter, iptables_filter_prefix, filter);
 588 }
 589
 590 static void iptables_unregister(void)
 591 {
 592         char buf[BUF_SIZE_FOR_CMD] = {0, };
 593         char *filter;
 594
 595         filter = iptables_filter_out;
 596
 597         snprintf(buf, sizeof(buf), IPTABLES_FMT_DEL_RULE,
 598                         iptables_cmd, filter, iptables_filter_prefix, filter);
 599         if (netconfig_execute_cmd(buf))
 600                 ERR("Failed to execute command: %s", buf);
 601
 602         memset(buf, '0', sizeof(buf));
 603         snprintf(buf, sizeof(buf), IPTABLES_FMT_FLUSH_CHAIN,
 604                         iptables_cmd, iptables_filter_prefix, filter);
 605         if (netconfig_execute_cmd(buf))
 606                 ERR("Failed to execute command: %s", buf);
 607
 608         memset(buf, '0', sizeof(buf));
 609         snprintf(buf, sizeof(buf), IPTABLES_FMT_DEL_CHAIN,
 610                         iptables_cmd, iptables_filter_prefix, filter);
 611         if (netconfig_execute_cmd(buf))
 612                 ERR("Failed to execute command: %s", buf);
 613
 614         filter = iptables_filter_in;
 615
 616         memset(buf, '0', sizeof(buf));
 617         snprintf(buf, sizeof(buf), IPTABLES_FMT_DEL_RULE,
 618                         iptables_cmd, filter, iptables_filter_prefix, filter);
 619         if (netconfig_execute_cmd(buf))
 620                 ERR("Failed to execute command: %s", buf);
 621
 622         memset(buf, '0', sizeof(buf));
 623         snprintf(buf, sizeof(buf), IPTABLES_FMT_FLUSH_CHAIN,
 624                         iptables_cmd, iptables_filter_prefix, filter);
 625         if (netconfig_execute_cmd(buf))
 626                 ERR("Failed to execute command: %s", buf);
 627
 628         memset(buf, '0', sizeof(buf));
 629         snprintf(buf, sizeof(buf), IPTABLES_FMT_DEL_CHAIN,
 630                         iptables_cmd, iptables_filter_prefix, filter);
 631         if (netconfig_execute_cmd(buf))
 632                 ERR("Failed to execute command: %s", buf);
 633 }
 634
 635 static void iptables_rule(const char c, const char *addr, const int mask)
 636 {
 637         char buf[BUF_SIZE_FOR_CMD];
 638
 639         snprintf(buf, sizeof(buf), IPTABLES_FMT_APPEND_ACCEPT_RULE,
 640                         iptables_cmd, c, iptables_filter_prefix,
 641                         iptables_filter_out, 'd', addr, mask);
 642         if (netconfig_execute_cmd(buf))
 643                 ERR("Failed to execute command: %s", buf);
 644
 645         memset(buf, '0', sizeof(buf));
 646         snprintf(buf, sizeof(buf), IPTABLES_FMT_APPEND_ACCEPT_RULE,
 647                         iptables_cmd, c,  iptables_filter_prefix,
 648                         iptables_filter_in, 's', addr, mask);
 649         if (netconfig_execute_cmd(buf))
 650                 ERR("Failed to execute command: %s", buf);
 651 }
 652
 653 static void iptables_rule_interface(const char c, const char *addr, const int mask, const char *interface)
 654 {
 655         char buf[BUF_SIZE_FOR_CMD];
 656
 657         snprintf(buf, sizeof(buf), IPTABLES_FMT_APPEND_ACCEPT_RULE_WITH_INTF,
 658                         iptables_cmd, c, iptables_filter_prefix, iptables_filter_out,
 659                         'o', interface, 'd', addr, mask);
 660         if (netconfig_execute_cmd(buf))
 661                 ERR("Failed to execute command: %s", buf);
 662
 663         memset(buf, '0', sizeof(buf));
 664         snprintf(buf, sizeof(buf), IPTABLES_FMT_APPEND_ACCEPT_RULE_WITH_INTF,
 665                         iptables_cmd, c, iptables_filter_prefix, iptables_filter_in,
 666                         'i', interface, 's', addr, mask);
 667         if (netconfig_execute_cmd(buf))
 668                 ERR("Failed to execute command: %s", buf);
 669 }
 670
 671 void iptables_add_orig(const char *addr, const int mask)
 672 {
 673         iptables_rule_interface('I', addr, mask, iptables_filter_interface_wlan);
 674 }
 675
 676 void iptables_delete_orig(const char *addr, const int mask)
 677 {
 678         iptables_rule_interface('D', addr, mask, iptables_filter_interface_wlan);
 679 }
 680
 681 void iptables_add(const char *addr, const int mask)
 682 {
 683         iptables_rule('I', addr, mask);
 684 }
 685
 686 void iptables_delete(const char *addr, const int mask)
 687 {
 688         iptables_rule('D', addr, mask);
 689 }
 690
 691 static int get_interface_index(const char *iface_name)
 692 {
 693         struct ifreq ifr;
 694         int sk = 0;
 695         char buf[BUF_SIZE_FOR_ERR] = { 0 };
 696
 697         DBG("enter get_interface_index, iface_name : %s", iface_name);
 698
 699         sk = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
 700         if (sk < 0) {
 701                 ERR("socket failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 702                 return VPNSVC_ERROR_IO_ERROR;
 703         }
 704
 705         memset(&ifr, 0, sizeof(ifr));
 706
 707         if (*iface_name)
 708                 strncpy(ifr.ifr_name, iface_name, IFNAMSIZ);
 709
 710         /* get an interface name by ifindex */
 711         if (ioctl(sk, SIOCGIFINDEX, &ifr) < 0) {
 712                 ERR("ioctl SIOCGIFINDEX failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 713                 close(sk);
 714                 return VPNSVC_ERROR_IO_ERROR;
 715         }
 716
 717         close(sk);
 718
 719         return ifr.ifr_ifindex;
 720 }
 721
 722 static int check_interface_precondition(const char *iface_name)
 723 {
 724
 725         int sk;
 726         struct ifreq ifr_tun;
 727         char buf[BUF_SIZE_FOR_ERR] = { 0 };
 728
 729         sk = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
 730         if (sk < 0) {
 731                 ERR("socket failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 732                 return VPNSVC_ERROR_IO_ERROR;
 733         }
 734
 735         memset(&ifr_tun, 0, sizeof(ifr_tun));
 736         g_strlcpy((char *)ifr_tun.ifr_name, iface_name, sizeof(ifr_tun.ifr_name));
 737
 738         /* local ip */
 739         if (ioctl(sk, SIOCGIFADDR, &ifr_tun) < 0) {
 740                 ERR("Fail to get local IP address: %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 741                 close(sk);
 742                 return VPNSVC_ERROR_INVALID_PARAMETER;
 743         }
 744
 745         /* remote ip */
 746         if (ioctl(sk, SIOCGIFDSTADDR, &ifr_tun) < 0) {
 747                 ERR("Fail to get remote IP address: %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 748                 close(sk);
 749                 return VPNSVC_ERROR_INVALID_PARAMETER;
 750         }
 751
 752         close(sk);
 753
 754         return VPNSVC_ERROR_NONE;
 755 }
 756
 757
 758 int vpn_service_init(const char* iface_name, size_t iface_name_len, int fd, vpnsvc_tun_s *handle_s)
 759 {
 760         struct ifreq ifr;
 761         size_t len = 0;
 762         char buf[BUF_SIZE_FOR_ERR] = { 0 };
 763
 764         DBG("enter vpn_daemon_init, iface_name : %s, iface_name_len : %d, fd : %d\n", iface_name, iface_name_len, fd);
 765
 766         memset(&ifr, 0, sizeof(ifr));
 767
 768         /* Flags: IFF_TUN   - TUN device (no Ethernet headers)
 769         *               IFF_TAP   - TAP device
 770         *
 771         *               IFF_NO_PI - Do not provide packet information
 772         */
 773
 774         ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
 775
 776         if (*iface_name)
 777                 strncpy(ifr.ifr_name, iface_name, iface_name_len);
 778
 779         DBG("before init, ifindex : %d", ifr.ifr_ifindex);
 780
 781         if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
 782                 ERR("TUNSETIFF Failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 783                 close(fd);
 784                 return VPNSVC_ERROR_IO_ERROR;
 785         }
 786
 787         if (ioctl(fd, TUNSETOWNER, 5000) < 0) {
 788                 ERR("TUNSETOWNER Failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 789                 close(fd);
 790                 return VPNSVC_ERROR_IO_ERROR;
 791         }
 792
 793         if (ioctl(fd, TUNSETPERSIST, 1) < 0) {
 794                 ERR("TUNSETPERSIST Failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 795                 close(fd);
 796                 return VPNSVC_ERROR_IO_ERROR;
 797         }
 798
 799         handle_s->fd = 0;   /* server fd does not meaning */
 800         handle_s->index = get_interface_index(iface_name);
 801         len = strlen(ifr.ifr_name);
 802         strncpy(handle_s->name, ifr.ifr_name, len);
 803         handle_s->name[len] = '\0';
 804
 805         return VPNSVC_ERROR_NONE;
 806 }
 807
 808 int vpn_service_deinit(const char* dev_name)
 809 {
 810         char buf[100];
 811
 812         snprintf(buf, sizeof(buf), "/usr/sbin/ip link del %s", dev_name);
 813
 814         if (netconfig_execute_cmd(buf)) {
 815                 ERR("Failed to execute command: %s", buf);
 816                 return VPNSVC_ERROR_IO_ERROR;
 817         }
 818
 819         return VPNSVC_ERROR_NONE;
 820 }
 821
 822 int vpn_service_protect(int socket_fd, const char* dev_name)
 823 {
 824         int ret = VPNSVC_ERROR_NONE;
 825         char buf[BUF_SIZE_FOR_ERR] = { 0 };
 826         DBG("enter vpn_daemon_protect, socket : %d, dev_name : %s\n", socket_fd, dev_name);
 827
 828         ret = setsockopt(socket_fd, SOL_SOCKET, SO_BINDTODEVICE,
 829                                         dev_name, strlen(dev_name));
 830
 831         if (ret < 0) {
 832                 DBG("setsockopt failed : %d, %s", ret, strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 833                 ret = VPNSVC_ERROR_IO_ERROR;
 834         } else {
 835                 ret = VPNSVC_ERROR_NONE;
 836         }
 837
 838         return ret;
 839 }
 840
 841 int vpn_service_up(const char *iface_name)
 842 {
 843         struct ifreq ifr_tun;
 844         int sk;
 845         int ret = VPNSVC_ERROR_NONE;
 846         char buf[BUF_SIZE_FOR_ERR] = { 0 };
 847
 848         DBG("enter vpn_daemon_up");
 849         DBG("iface_name : %s", iface_name);
 850
 851
 852         ret = check_interface_precondition(iface_name);
 853         if (ret != VPNSVC_ERROR_NONE)
 854                 return ret;
 855
 856         sk = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
 857         if (sk < 0) {
 858                 ERR("socket failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 859                 return VPNSVC_ERROR_IO_ERROR;
 860         }
 861
 862         memset(&ifr_tun, 0, sizeof(ifr_tun));
 863         g_strlcpy((char *)ifr_tun.ifr_name, iface_name, sizeof(ifr_tun.ifr_name));
 864
 865         /* set the flags for vpn up */
 866         if (ioctl(sk, SIOCGIFFLAGS, &ifr_tun) < 0) {
 867                 ERR("ioctl SIOCGIFFLAGS failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 868                 close(sk);
 869                 return VPNSVC_ERROR_IO_ERROR;
 870         }
 871
 872         ifr_tun.ifr_flags |= IFF_UP;
 873         ifr_tun.ifr_flags |= IFF_RUNNING;
 874
 875         if (ioctl(sk, SIOCSIFFLAGS, &ifr_tun) < 0)  {
 876                 ERR("ioctl SIOCSIFFLAGS failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 877                 close(sk);
 878                 return VPNSVC_ERROR_IO_ERROR;
 879         }
 880
 881         close(sk);
 882
 883 #if 0
 884         /* add DNS servers */
 885         if (nr_dns > 0) {
 886                 ret = add_dns_servers(dns_servers, nr_dns, total_dns_string_cnt);
 887                 if (ret != VPNSVC_ERROR_NONE) {
 888                         ERR("add_dns failed");
 889                         return ret;
 890                 }
 891         }
 892
 893         /* add_dns_suffix */
 894         if (dns_suffix) {
 895                 ret = add_dns_suffix(dns_suffix, strlen(dns_suffix));
 896                 if (ret != VPNSVC_ERROR_NONE) {
 897                         ERR("add_dns_suffix failed");
 898                         return ret;
 899                 }
 900         }
 901
 902         if (nr_dns > 0)
 903                 dns_nat_register(dns_servers, nr_dns, local_ip);
 904 #endif
 905
 906         return ret;
 907 }
 908
 909
 910
 911 int vpn_service_down(const char *iface_name)
 912 {
 913         struct ifreq ifr;
 914         int sk;
 915         char buf[BUF_SIZE_FOR_ERR] = { 0 };
 916
 917         sk = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
 918         if (sk < 0) {
 919                 ERR("socket failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 920                 return VPNSVC_ERROR_IO_ERROR;
 921         }
 922
 923         memset(&ifr, 0, sizeof(ifr));
 924         g_strlcpy((char *)ifr.ifr_name, iface_name, sizeof(ifr.ifr_name));
 925
 926         if (ioctl(sk, SIOCGIFFLAGS, &ifr) < 0) {
 927                 ERR("ioctl SIOCGIFFLAGS failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 928                 close(sk);
 929                 return VPNSVC_ERROR_IO_ERROR;
 930         }
 931
 932         if (!(ifr.ifr_flags & IFF_UP)) {
 933                 DBG("Interface already down");
 934                 close(sk);
 935                 return VPNSVC_ERROR_NONE;
 936         }
 937
 938         ifr.ifr_flags = (ifr.ifr_flags & ~IFF_UP) | IFF_DYNAMIC;
 939         if (ioctl(sk, SIOCSIFFLAGS, &ifr) < 0) {
 940                 ERR("ioctl SIOCSIFFLAGS (interface down) failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 941                 close(sk);
 942                 return VPNSVC_ERROR_IO_ERROR;
 943         }
 944
 945         close(sk);
 946
 947         /* routes are will be removed  automatically while down interfaces */
 948         /* remove dns servers */
 949         del_dns_servers();
 950
 951         /* remove dns suffix */
 952         del_dns_suffix();
 953
 954         /* remove dns filter */
 955         dns_nat_unregister();
 956
 957         return VPNSVC_ERROR_NONE;
 958 }
 959
 960 int vpn_service_block_networks(char* nets_vpn[], int prefix_vpn[], size_t nr_nets_vpn,
 961                 char* nets_orig[], int prefix_orig[], size_t nr_nets_orig) {
 962         unsigned int i;
 963
 964         /* iptable chain regist */
 965         iptables_register();
 966
 967         for (i = 0; i < nr_nets_vpn; i++) {
 968                 DBG("block[%d] ip/mask : %s/%d", i, nets_vpn[i], prefix_vpn[i]);
 969                 iptables_add(nets_vpn[i], prefix_vpn[i]);
 970         }
 971
 972         for (i = 0; i < nr_nets_orig; i++) {
 973                 DBG("allow[%d] ip/mask : %s/%d", i, nets_orig[i], prefix_orig[i]);
 974                 iptables_add_orig(nets_orig[i], prefix_orig[i]);
 975         }
 976
 977         return VPNSVC_ERROR_NONE;
 978 }
 979
 980 int vpn_service_unblock_networks(void)
 981 {
 982         iptables_unregister();
 983
 984         return VPNSVC_ERROR_NONE;
 985 }
 986
 987 int vpn_service_update_settings(int iface_index, const char *local_ip,
 988                 const char *remote_ip, const unsigned int mtu)
 989 {
 990         int sk;
 991         struct ifreq ifr_tun;
 992         struct sockaddr_in local_addr;
 993         struct sockaddr_in remote_addr;
 994         char buf[BUF_SIZE_FOR_ERR] = { 0 };
 995
 996         sk = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
 997         if (sk < 0) {
 998                 ERR("socket failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
 999                 return VPNSVC_ERROR_IO_ERROR;
1000         }
1001
1002         memset(&ifr_tun, 0, sizeof(ifr_tun));
1003         ifr_tun.ifr_ifindex = iface_index;
1004
1005         /* get an interface name by ifindex */
1006         if (ioctl(sk, SIOCGIFNAME, &ifr_tun) < 0) {
1007                 ERR("ioctl SIOCGIFNAME failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1008                 close(sk);
1009                 return VPNSVC_ERROR_IO_ERROR;
1010         }
1011
1012         /* local ip setting */
1013         memset(&local_addr, 0, sizeof(local_addr));
1014         local_addr.sin_addr.s_addr = inet_addr(local_ip); /* network byte order */
1015         local_addr.sin_family = AF_INET;
1016         memcpy(&ifr_tun.ifr_addr, &local_addr, sizeof(ifr_tun.ifr_addr));
1017         if (ioctl(sk, SIOCSIFADDR, &ifr_tun) < 0) {
1018                 ERR("ioctl SIOCSIFADDR failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1019                 close(sk);
1020                 return VPNSVC_ERROR_IO_ERROR;
1021         }
1022
1023         /* remote ip setting */
1024         memset(&remote_addr, 0, sizeof(remote_addr));
1025         remote_addr.sin_addr.s_addr = inet_addr(remote_ip); /*network byte order*/
1026         remote_addr.sin_family = AF_INET;
1027         memcpy(&ifr_tun.ifr_dstaddr, &remote_addr, sizeof(ifr_tun.ifr_dstaddr));
1028         if (ioctl(sk, SIOCSIFDSTADDR, &ifr_tun) < 0) {
1029                 ERR("ioctl SIOCSIFDSTADDR failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1030                 close(sk);
1031                 return VPNSVC_ERROR_IO_ERROR;
1032         }
1033
1034         /* mtu setting */
1035         if (mtu > 0 && ifr_tun.ifr_mtu != (int)mtu) {
1036                 ifr_tun.ifr_mtu = mtu;
1037                 if (ioctl(sk, SIOCSIFMTU, &ifr_tun) < 0) {
1038                         ERR("ioctl SIOCSIFMTU failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1039                         close(sk);
1040                         return VPNSVC_ERROR_IO_ERROR;
1041                 }
1042         }
1043
1044         close(sk);
1045
1046         return VPNSVC_ERROR_NONE;
1047 }
1048
1049 int vpn_service_add_route(char *iface_name, const char *route, int prefix)
1050 {
1051         struct rtentry rt;
1052         struct sockaddr_in addr;
1053         int sk;
1054         char buf[BUF_SIZE_FOR_ERR] = { 0 };
1055
1056         sk = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
1057         if (sk < 0) {
1058                 ERR("socket failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1059                 return VPNSVC_ERROR_IO_ERROR;
1060         }
1061
1062         memset(&rt, 0, sizeof(rt));
1063         rt.rt_flags = RTF_UP;
1064
1065         memset(&addr, 0, sizeof(addr));
1066         addr.sin_family = AF_INET;
1067         addr.sin_addr.s_addr = inet_addr(route);
1068         memcpy(&rt.rt_dst, &addr, sizeof(rt.rt_dst));
1069
1070         memset(&addr, 0, sizeof(addr));
1071         addr.sin_family = AF_INET;
1072         addr.sin_addr.s_addr = INADDR_ANY;
1073         memcpy(&rt.rt_gateway, &addr, sizeof(rt.rt_gateway));
1074
1075         /* set mask using by prefix length */
1076         memset(&addr, 0, sizeof(addr));
1077         addr.sin_family = AF_INET;
1078         addr.sin_addr.s_addr = INADDR_ANY;
1079         addr.sin_addr.s_addr = host2net(make_mask(prefix));
1080         memcpy(&rt.rt_genmask, &addr, sizeof(rt.rt_genmask));
1081
1082         rt.rt_dev = iface_name;
1083
1084         if (ioctl(sk, SIOCADDRT, &rt) < 0) {
1085                 ERR("ioctl SIOCADDRT failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1086                 close(sk);
1087                 return VPNSVC_ERROR_IO_ERROR;
1088         }
1089
1090         close(sk);
1091
1092         return VPNSVC_ERROR_NONE;
1093 }
1094
1095 int vpn_service_remove_route(char *iface_name, const char *route, int prefix)
1096 {
1097         struct rtentry rt;
1098         struct sockaddr_in addr;
1099         int sk;
1100         char buf[BUF_SIZE_FOR_ERR] = { 0 };
1101
1102         sk = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
1103         if (sk < 0) {
1104                 ERR("socket failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1105                 return VPNSVC_ERROR_IO_ERROR;
1106         }
1107
1108         memset(&rt, 0, sizeof(rt));
1109         rt.rt_flags = RTF_UP;
1110
1111         memset(&addr, 0, sizeof(addr));
1112         addr.sin_family = AF_INET;
1113         addr.sin_addr.s_addr = inet_addr(route);
1114         memcpy(&rt.rt_dst, &addr, sizeof(rt.rt_dst));
1115
1116         memset(&addr, 0, sizeof(addr));
1117         addr.sin_family = AF_INET;
1118         addr.sin_addr.s_addr = INADDR_ANY;
1119         memcpy(&rt.rt_gateway, &addr, sizeof(rt.rt_gateway));
1120
1121         /* set mask using by prefix length */
1122         memset(&addr, 0, sizeof(addr));
1123         addr.sin_family = AF_INET;
1124         addr.sin_addr.s_addr = INADDR_ANY;
1125         addr.sin_addr.s_addr = host2net(make_mask(prefix));
1126         memcpy(&rt.rt_genmask, &addr, sizeof(rt.rt_genmask));
1127
1128         rt.rt_dev = iface_name;
1129
1130         if (ioctl(sk, SIOCDELRT, &rt) < 0) {
1131                 ERR("ioctl SIOCDERLT failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1132                 close(sk);
1133                 return VPNSVC_ERROR_IO_ERROR;
1134         }
1135
1136         close(sk);
1137
1138         return VPNSVC_ERROR_NONE;
1139
1140 }
1141
1142 int vpn_service_add_dns_server(char *iface_name, const char *dns_server)
1143 {
1144         struct rtentry rt;
1145         struct sockaddr_in addr;
1146         int sk;
1147         char buf[BUF_SIZE_FOR_ERR] = { 0 };
1148
1149         sk = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
1150         if (sk < 0) {
1151                 ERR("socket failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1152                 return VPNSVC_ERROR_IO_ERROR;
1153         }
1154
1155         memset(&rt, 0, sizeof(rt));
1156         rt.rt_flags = RTF_UP;
1157
1158         memset(&addr, 0, sizeof(addr));
1159         addr.sin_family = AF_INET;
1160         addr.sin_addr.s_addr = inet_addr(dns_server);
1161         memcpy(&rt.rt_dst, &addr, sizeof(rt.rt_dst));
1162
1163         memset(&addr, 0, sizeof(addr));
1164         addr.sin_family = AF_INET;
1165         addr.sin_addr.s_addr = INADDR_ANY;
1166         memcpy(&rt.rt_gateway, &addr, sizeof(rt.rt_gateway));
1167
1168         /* set mask using by prefix length */
1169         memset(&addr, 0, sizeof(addr));
1170         addr.sin_family = AF_INET;
1171         addr.sin_addr.s_addr = INADDR_ANY;
1172         addr.sin_addr.s_addr = host2net(make_mask(32));
1173         memcpy(&rt.rt_genmask, &addr, sizeof(rt.rt_genmask));
1174
1175         rt.rt_dev = iface_name;
1176
1177         if (ioctl(sk, SIOCADDRT, &rt) < 0) {
1178                 ERR("ioctl SIOCADDRT failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1179                 close(sk);
1180                 return VPNSVC_ERROR_IO_ERROR;
1181         }
1182
1183         close(sk);
1184
1185         return VPNSVC_ERROR_NONE;
1186 }
1187
1188 int vpn_service_remove_dns_server(char *iface_name, const char *dns_server)
1189 {
1190         struct rtentry rt;
1191         struct sockaddr_in addr;
1192         int sk;
1193         char buf[BUF_SIZE_FOR_ERR] = { 0 };
1194
1195         sk = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
1196         if (sk < 0) {
1197                 ERR("socket failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1198                 return VPNSVC_ERROR_IO_ERROR;
1199         }
1200
1201         memset(&rt, 0, sizeof(rt));
1202         rt.rt_flags = RTF_UP;
1203
1204         memset(&addr, 0, sizeof(addr));
1205         addr.sin_family = AF_INET;
1206         addr.sin_addr.s_addr = inet_addr(dns_server);
1207         memcpy(&rt.rt_dst, &addr, sizeof(rt.rt_dst));
1208
1209         memset(&addr, 0, sizeof(addr));
1210         addr.sin_family = AF_INET;
1211         addr.sin_addr.s_addr = INADDR_ANY;
1212         memcpy(&rt.rt_gateway, &addr, sizeof(rt.rt_gateway));
1213
1214         /* set mask using by prefix length */
1215         memset(&addr, 0, sizeof(addr));
1216         addr.sin_family = AF_INET;
1217         addr.sin_addr.s_addr = INADDR_ANY;
1218         addr.sin_addr.s_addr = host2net(make_mask(32));
1219         memcpy(&rt.rt_genmask, &addr, sizeof(rt.rt_genmask));
1220
1221         rt.rt_dev = iface_name;
1222
1223         if (ioctl(sk, SIOCDELRT, &rt) < 0) {
1224                 ERR("ioctl SIOCDELRT failed : %s", strerror_r(errno, buf, BUF_SIZE_FOR_ERR));
1225                 close(sk);
1226                 return VPNSVC_ERROR_IO_ERROR;
1227         }
1228
1229         close(sk);
1230
1231         return VPNSVC_ERROR_NONE;
1232 }