tools/iptables-test.c

   1 /*
   2  *  Connection Manager
   3  *
   4  *  Copyright (C) 2007-2010  Intel Corporation. All rights reserved.
   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 version 2 as
   8  *  published by the Free Software Foundation.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #include <getopt.h>
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/errno.h>
  27 #include <sys/socket.h>
  28 #include <xtables.h>
  29
  30 #include <linux/netfilter_ipv4/ip_tables.h>
  31
  32 #include <glib.h>
  33
  34 static const char *hooknames[] = {
  35         [NF_IP_PRE_ROUTING]     = "PREROUTING",
  36         [NF_IP_LOCAL_IN]        = "INPUT",
  37         [NF_IP_FORWARD]         = "FORWARD",
  38         [NF_IP_LOCAL_OUT]       = "OUTPUT",
  39         [NF_IP_POST_ROUTING]    = "POSTROUTING",
  40 };
  41
  42 #define LABEL_ACCEPT  "ACCEPT"
  43 #define LABEL_DROP    "DROP"
  44 #define LABEL_QUEUE   "QUEUE"
  45 #define LABEL_RETURN  "RETURN"
  46
  47 /* fn returns 0 to continue iteration */
  48 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
  49 ({                                                              \
  50         unsigned int __i;                                       \
  51         int __n;                                                \
  52         int __ret = 0;                                          \
  53         type *__entry;                                          \
  54                                                                 \
  55         for (__i = 0, __n = 0; __i < (size);                    \
  56              __i += __entry->next_offset, __n++) {              \
  57                 __entry = (void *)(entries) + __i;              \
  58                 if (__n < n)                                    \
  59                         continue;                               \
  60                                                                 \
  61                 __ret = fn(__entry,  ## args);                  \
  62                 if (__ret != 0)                                 \
  63                         break;                                  \
  64         }                                                       \
  65         __ret;                                                  \
  66 })
  67
  68 /* fn returns 0 to continue iteration */
  69 #define _XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
  70         _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
  71
  72 #define ENTRY_ITERATE(entries, size, fn, args...) \
  73         _XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
  74
  75 #define MIN_ALIGN (__alignof__(struct ipt_entry))
  76
  77 #define ALIGN(s) (((s) + ((MIN_ALIGN)-1)) & ~((MIN_ALIGN)-1))
  78
  79 struct error_target {
  80         struct xt_entry_target t;
  81         char error[IPT_TABLE_MAXNAMELEN];
  82 };
  83
  84 struct connman_iptables_entry {
  85         int offset;
  86         int builtin;
  87
  88         struct ipt_entry *entry;
  89 };
  90
  91 struct connman_iptables {
  92         int ipt_sock;
  93
  94         struct ipt_getinfo *info;
  95         struct ipt_get_entries *blob_entries;
  96
  97         unsigned int num_entries;
  98         unsigned int old_entries;
  99         unsigned int size;
 100
 101         unsigned int underflow[NF_INET_NUMHOOKS];
 102         unsigned int hook_entry[NF_INET_NUMHOOKS];
 103
 104         GList *entries;
 105 };
 106
 107
 108 static struct ipt_entry *get_entry(struct connman_iptables *table,
 109                                         unsigned int offset)
 110 {
 111         return (struct ipt_entry *)((char *)table->blob_entries->entrytable +
 112                                                                         offset);
 113 }
 114
 115 static int is_hook_entry(struct connman_iptables *table,
 116                                 struct ipt_entry *entry)
 117 {
 118         unsigned int i;
 119
 120         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 121                 if ((table->info->valid_hooks & (1 << i))
 122                 && get_entry(table, table->info->hook_entry[i]) == entry)
 123                         return i;
 124         }
 125
 126         return -1;
 127 }
 128
 129 static unsigned long entry_to_offset(struct connman_iptables *table,
 130                                         struct ipt_entry *entry)
 131 {
 132         return (void *)entry - (void *)table->blob_entries->entrytable;
 133 }
 134
 135 static int target_to_verdict(char *target_name)
 136 {
 137         if (!strcmp(target_name, LABEL_ACCEPT))
 138                 return -NF_ACCEPT - 1;
 139
 140         if (!strcmp(target_name, LABEL_DROP))
 141                 return -NF_DROP - 1;
 142
 143         if (!strcmp(target_name, LABEL_QUEUE))
 144                 return -NF_QUEUE - 1;
 145
 146         if (!strcmp(target_name, LABEL_RETURN))
 147                 return XT_RETURN;
 148
 149         return 0;
 150 }
 151
 152 static gboolean is_builtin_target(char *target_name)
 153 {
 154         if (!strcmp(target_name, LABEL_ACCEPT) ||
 155                 !strcmp(target_name, LABEL_DROP) ||
 156                 !strcmp(target_name, LABEL_QUEUE) ||
 157                 !strcmp(target_name, LABEL_RETURN))
 158                 return TRUE;
 159
 160         return FALSE;
 161 }
 162
 163 static gboolean is_jump(struct connman_iptables_entry *e)
 164 {
 165         struct xt_entry_target *target;
 166
 167         target = ipt_get_target(e->entry);
 168
 169         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 170                 struct xt_standard_target *t;
 171
 172                 t = (struct xt_standard_target *)target;
 173
 174                 switch (t->verdict) {
 175                 case XT_RETURN:
 176                 case -NF_ACCEPT - 1:
 177                 case -NF_DROP - 1:
 178                 case -NF_QUEUE - 1:
 179                 case -NF_STOP - 1:
 180                         return false;
 181
 182                 default:
 183                         return true;
 184                 }
 185         }
 186
 187         return false;
 188 }
 189
 190 static gboolean is_chain(struct connman_iptables *table,
 191                                 struct connman_iptables_entry *e)
 192 {
 193         struct ipt_entry *entry;
 194         struct xt_entry_target *target;
 195
 196         entry = e->entry;
 197         if (e->builtin >= 0)
 198                 return TRUE;
 199
 200         target = ipt_get_target(entry);
 201         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET))
 202                 return TRUE;
 203
 204         return FALSE;
 205 }
 206
 207 static GList *find_chain_head(struct connman_iptables *table,
 208                                 char *chain_name)
 209 {
 210         GList *list;
 211         struct connman_iptables_entry *head;
 212         struct ipt_entry *entry;
 213         struct xt_entry_target *target;
 214         int builtin;
 215
 216         for (list = table->entries; list; list = list->next) {
 217                 head = list->data;
 218                 entry = head->entry;
 219
 220                 /* Buit-in chain */
 221                 builtin = head->builtin;
 222                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 223                         break;
 224
 225                 /* User defined chain */
 226                 target = ipt_get_target(entry);
 227                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 228                     !strcmp((char *)target->data, chain_name))
 229                         break;
 230         }
 231
 232         return list;
 233 }
 234
 235 static GList *find_chain_tail(struct connman_iptables *table,
 236                                 char *chain_name)
 237 {
 238         GList *chain_head, *list;
 239         struct connman_iptables_entry *tail;
 240
 241         chain_head = find_chain_head(table, chain_name);
 242         if (chain_head == NULL)
 243                 return NULL;
 244
 245         /* Then we look for the next chain */
 246         for (list = chain_head->next; list; list = list->next) {
 247                 tail = list->data;
 248
 249                 if (is_chain(table, tail))
 250                         return list;
 251         }
 252
 253         /* Nothing found, we return the table end */
 254         return g_list_last(table->entries);
 255 }
 256
 257 static void update_offsets(struct connman_iptables *table)
 258 {
 259         GList *list, *prev;
 260         struct connman_iptables_entry *entry, *prev_entry;
 261
 262         for (list = table->entries; list; list = list->next) {
 263                 entry = list->data;
 264
 265                 if (list == table->entries) {
 266                         entry->offset = 0;
 267
 268                         continue;
 269                 }
 270
 271                 prev = list->prev;
 272                 prev_entry = prev->data;
 273
 274                 entry->offset = prev_entry->offset +
 275                                         prev_entry->entry->next_offset;
 276         }
 277 }
 278
 279 static int connman_add_entry(struct connman_iptables *table,
 280                                 struct ipt_entry *entry, GList *before,
 281                                         int builtin)
 282 {
 283         GList *list;
 284         struct connman_iptables_entry *e, *tmp, *entry_before;
 285         struct xt_standard_target *t;
 286
 287         if (table == NULL)
 288                 return -1;
 289
 290         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 291         if (e == NULL)
 292                 return -1;
 293
 294         e->entry = entry;
 295         e->builtin = builtin;
 296
 297         table->entries = g_list_insert_before(table->entries, before, e);
 298         table->num_entries++;
 299         table->size += entry->next_offset;
 300
 301         if (before == NULL) {
 302                 e->offset = table->size - entry->next_offset;
 303
 304                 return 0;
 305         }
 306
 307         entry_before = before->data;
 308
 309         /*
 310          * We've just insterted a new entry. All references before it
 311          * should be bumped accordingly.
 312          */
 313         for (list = table->entries; list != before; list = list->next) {
 314                 tmp = list->data;
 315
 316                 if (!is_jump(tmp))
 317                         continue;
 318
 319                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 320
 321                 if (t->verdict >= entry_before->offset)
 322                         t->verdict += entry->next_offset;
 323         }
 324
 325         update_offsets(table);
 326
 327         return 0;
 328 }
 329
 330 static int remove_table_entry(struct connman_iptables *table,
 331                                         struct connman_iptables_entry *entry)
 332 {
 333         int removed = 0;
 334
 335         table->num_entries--;
 336         table->size -= entry->entry->next_offset;
 337         removed = entry->entry->next_offset;
 338
 339         g_free(entry->entry);
 340
 341         table->entries = g_list_remove(table->entries, entry);
 342
 343         return removed;
 344 }
 345
 346 static int connman_iptables_flush_chain(struct connman_iptables *table,
 347                                                 char *name)
 348 {
 349         GList *chain_head, *chain_tail, *list, *next;
 350         struct connman_iptables_entry *entry;
 351         int builtin, removed = 0;
 352
 353         chain_head = find_chain_head(table, name);
 354         if (chain_head == NULL)
 355                 return -EINVAL;
 356
 357         chain_tail = find_chain_tail(table, name);
 358         if (chain_tail == NULL)
 359                 return -EINVAL;
 360
 361         entry = chain_head->data;
 362         builtin = entry->builtin;
 363
 364         if (builtin >= 0)
 365                 list = chain_head;
 366         else
 367                 list = chain_head->next;
 368
 369         if (list == chain_tail->prev)
 370                 return 0;
 371
 372         while (list != chain_tail->prev) {
 373                 entry = list->data;
 374                 next = g_list_next(list);
 375
 376                 removed += remove_table_entry(table, entry);
 377
 378                 list = next;
 379         }
 380
 381         if (builtin >= 0) {
 382                 struct connman_iptables_entry *e;
 383
 384                 entry = list->data;
 385
 386                 entry->builtin = builtin;
 387
 388                 table->underflow[builtin] -= removed;
 389
 390                 for (list = chain_tail; list; list = list->next) {
 391                         e = list->data;
 392
 393                         builtin = e->builtin;
 394                         if (builtin < 0)
 395                                 continue;
 396
 397                         table->hook_entry[builtin] -= removed;
 398                         table->underflow[builtin] -= removed;
 399                 }
 400         }
 401
 402         update_offsets(table);
 403
 404         return 0;
 405 }
 406
 407 static int connman_iptables_delete_chain(struct connman_iptables *table,
 408                                                 char *name)
 409 {
 410         GList *chain_head, *chain_tail;
 411         struct connman_iptables_entry *entry;
 412
 413         chain_head = find_chain_head(table, name);
 414         if (chain_head == NULL)
 415                 return -EINVAL;
 416
 417         entry = chain_head->data;
 418
 419         /* We cannot remove builtin chain */
 420         if (entry->builtin >= 0)
 421                 return -EINVAL;
 422
 423         chain_tail = find_chain_tail(table, name);
 424         if (chain_tail == NULL)
 425                 return -EINVAL;
 426
 427         /* Chain must be flushed */
 428         if (chain_head->next != chain_tail->prev)
 429                 return -EINVAL;
 430
 431         remove_table_entry(table, entry);
 432
 433         entry = chain_tail->prev->data;
 434         remove_table_entry(table, entry);
 435
 436         update_offsets(table);
 437
 438         return 0;
 439 }
 440
 441 static int connman_iptables_add_chain(struct connman_iptables *table,
 442                                         char *name)
 443 {
 444         GList *last;
 445         struct ipt_entry *entry_head;
 446         struct ipt_entry *entry_return;
 447         struct error_target *error;
 448         struct ipt_standard_target *standard;
 449         u_int16_t entry_head_size, entry_return_size;
 450
 451         last = g_list_last(table->entries);
 452
 453         /*
 454          * An empty chain is composed of:
 455          * - A head entry, with no match and an error target.
 456          *   The error target data is the chain name.
 457          * - A tail entry, with no match and a standard target.
 458          *   The standard target verdict is XT_RETURN (return to the
 459          *   caller).
 460          */
 461
 462         /* head entry */
 463         entry_head_size = sizeof(struct ipt_entry) +
 464                                 sizeof(struct error_target);
 465         entry_head = g_try_malloc0(entry_head_size);
 466         if (entry_head == NULL)
 467                 goto err_head;
 468
 469         memset(entry_head, 0, entry_head_size);
 470
 471         entry_head->target_offset = sizeof(struct ipt_entry);
 472         entry_head->next_offset = entry_head_size;
 473
 474         error = (struct error_target *) entry_head->elems;
 475         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 476         error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
 477         strcpy(error->error, name);
 478
 479         if (connman_add_entry(table, entry_head, last, -1) < 0)
 480                 goto err_head;
 481
 482         /* tail entry */
 483         entry_return_size = sizeof(struct ipt_entry) +
 484                                 sizeof(struct ipt_standard_target);
 485         entry_return = g_try_malloc0(entry_return_size);
 486         if (entry_return == NULL)
 487                 goto err;
 488
 489         memset(entry_return, 0, entry_return_size);
 490
 491         entry_return->target_offset = sizeof(struct ipt_entry);
 492         entry_return->next_offset = entry_return_size;
 493
 494         standard = (struct ipt_standard_target *) entry_return->elems;
 495         standard->target.u.user.target_size =
 496                                 ALIGN(sizeof(struct ipt_standard_target));
 497         standard->verdict = XT_RETURN;
 498
 499         if (connman_add_entry(table, entry_return, last, -1) < 0)
 500                 goto err;
 501
 502         return 0;
 503
 504 err:
 505         g_free(entry_return);
 506 err_head:
 507         g_free(entry_head);
 508
 509         return -ENOMEM;
 510 }
 511
 512 static struct ipt_entry *
 513 new_rule(struct connman_iptables *table,
 514                 char *target_name, struct xtables_target *xt_t,
 515                 char *match_name, struct xtables_match *xt_m)
 516 {
 517         struct ipt_entry *new_entry;
 518         size_t match_size, target_size;
 519         int is_builtin = is_builtin_target(target_name);
 520
 521         if (xt_m)
 522                 match_size = xt_m->m->u.match_size;
 523         else
 524                 match_size = 0;
 525
 526         if (xt_t)
 527                 target_size = ALIGN(xt_t->t->u.target_size);
 528         else
 529                 target_size = ALIGN(sizeof(struct xt_standard_target));
 530
 531         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 532                                                                 match_size);
 533         if (new_entry == NULL)
 534                 return NULL;
 535
 536         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 537         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 538                                                                 match_size;
 539         if (xt_m) {
 540                 struct xt_entry_match *entry_match;
 541
 542                 entry_match = (struct xt_entry_match *)new_entry->elems;
 543                 memcpy(entry_match, xt_m->m, match_size);
 544         }
 545
 546         if (xt_t) {
 547                 struct xt_entry_target *entry_target;
 548
 549                 if (is_builtin) {
 550                         struct xt_standard_target *target;
 551
 552                         target = (struct xt_standard_target *)(xt_t->t);
 553                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 554                         target->verdict = target_to_verdict(target_name);
 555                 }
 556
 557                 entry_target = ipt_get_target(new_entry);
 558                 memcpy(entry_target, xt_t->t, target_size);
 559         } else {
 560                 struct connman_iptables_entry *target_rule;
 561                 struct xt_standard_target *target;
 562                 GList *chain_head;
 563
 564                 /*
 565                  * This is a user defined target, i.e. a chain jump.
 566                  * We search for the chain head, and the target verdict
 567                  * is the first rule's offset on this chain.
 568                  * The offset is from the beginning of the table.
 569                  */
 570
 571                 chain_head = find_chain_head(table, target_name);
 572                 if (chain_head == NULL || chain_head->next == NULL) {
 573                         g_free(new_entry);
 574                         return NULL;
 575                 }
 576
 577                 target_rule = chain_head->next->data;
 578
 579                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 580                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 581                 target->target.u.user.target_size = target_size;
 582                 target->verdict = target_rule->offset;
 583         }
 584
 585         return new_entry;
 586 }
 587
 588 static void update_hooks(struct connman_iptables *table, GList *chain_head, struct ipt_entry *entry)
 589 {
 590         GList *list;
 591         struct connman_iptables_entry *head, *e;
 592         int builtin;
 593
 594         if (chain_head == NULL)
 595                 return;
 596
 597         head = chain_head->data;
 598
 599         builtin = head->builtin;
 600         if (builtin < 0)
 601                 return;
 602
 603         table->underflow[builtin] += entry->next_offset;
 604
 605         for (list = chain_head->next; list; list = list->next) {
 606                 e = list->data;
 607
 608                 builtin = e->builtin;
 609                 if (builtin < 0)
 610                         continue;
 611
 612                 table->hook_entry[builtin] += entry->next_offset;
 613                 table->underflow[builtin] += entry->next_offset;
 614         }
 615 }
 616
 617 static int
 618 connman_iptables_add_rule(struct connman_iptables *table, char *chain_name,
 619                                 char *target_name, struct xtables_target *xt_t,
 620                                 char *match_name, struct xtables_match *xt_m)
 621 {
 622         GList *chain_tail, *chain_head;
 623         struct ipt_entry *new_entry;
 624         struct connman_iptables_entry *head;
 625         int builtin = -1;
 626
 627         chain_head = find_chain_head(table, chain_name);
 628         if (chain_head == NULL)
 629                 return -EINVAL;
 630
 631         chain_tail = find_chain_tail(table, chain_name);
 632         if (chain_tail == NULL)
 633                 return -EINVAL;
 634
 635         new_entry = new_rule(table,
 636                                 target_name, xt_t,
 637                                 match_name, xt_m);
 638         if (new_entry == NULL)
 639                 return -EINVAL;
 640
 641         update_hooks(table, chain_head, new_entry);
 642
 643         /*
 644          * If the chain is builtin, and does not have any rule,
 645          * then the one that we're inserting is becoming the head
 646          * and thus needs the builtin flag.
 647          */
 648         head = chain_head->data;
 649         if (head->builtin < 0)
 650                 builtin = -1;
 651         else if (chain_head == chain_tail->prev) {
 652                 builtin = head->builtin;
 653                 head->builtin = -1;
 654         }
 655
 656         return connman_add_entry(table, new_entry, chain_tail->prev, builtin);
 657 }
 658
 659 static struct ipt_replace *
 660 connman_iptables_blob(struct connman_iptables *table)
 661 {
 662         struct ipt_replace *r;
 663         GList *list;
 664         struct connman_iptables_entry *e;
 665         unsigned char *entry_index;
 666
 667         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 668         if (r == NULL)
 669                 return NULL;
 670
 671         memset(r, 0, sizeof(*r) + table->size);
 672
 673         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 674                                 * table->old_entries);
 675         if (r->counters == NULL) {
 676                 g_free(r);
 677                 return NULL;
 678         }
 679
 680         strcpy(r->name, table->info->name);
 681         r->num_entries = table->num_entries;
 682         r->size = table->size;
 683
 684         r->num_counters = table->old_entries;
 685         r->valid_hooks  = table->info->valid_hooks;
 686
 687         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 688         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 689
 690         entry_index = (unsigned char *)r->entries;
 691         for (list = table->entries; list; list = list->next) {
 692                 e = list->data;
 693
 694                 memcpy(entry_index, e->entry, e->entry->next_offset);
 695                 entry_index += e->entry->next_offset;
 696         }
 697
 698         return r;
 699 }
 700
 701 static void dump_target(struct connman_iptables *table,
 702                                 struct ipt_entry *entry)
 703
 704 {
 705         struct xtables_target *xt_t;
 706         struct xt_entry_target *target;
 707
 708         target = ipt_get_target(entry);
 709
 710         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 711                 struct xt_standard_target *t;
 712
 713                 t = (struct xt_standard_target *)target;
 714
 715                 switch (t->verdict) {
 716                 case XT_RETURN:
 717                         printf("\ttarget RETURN\n");
 718                         break;
 719
 720                 case -NF_ACCEPT - 1:
 721                         printf("\ttarget ACCEPT\n");
 722                         break;
 723
 724                 case -NF_DROP - 1:
 725                         printf("\ttarget DROP\n");
 726                         break;
 727
 728                 case -NF_QUEUE - 1:
 729                         printf("\ttarget QUEUE\n");
 730                         break;
 731
 732                 case -NF_STOP - 1:
 733                         printf("\ttarget STOP\n");
 734                         break;
 735
 736                 default:
 737                         printf("\tJUMP @%p (0x%x)\n",
 738                                 (char*)table->blob_entries->entrytable +
 739                                 t->verdict, t->verdict);
 740                         break;
 741                 }
 742
 743                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 744                                                 XTF_LOAD_MUST_SUCCEED);
 745
 746                 if(xt_t->print != NULL)
 747                         xt_t->print(NULL, target, 1);
 748         } else {
 749                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 750                 if (xt_t == NULL) {
 751                         printf("\ttarget %s\n", target->u.user.name);
 752                         return;
 753                 }
 754
 755                 if(xt_t->print != NULL) {
 756                         printf("\ttarget ");
 757                         xt_t->print(NULL, target, 1);
 758                         printf("\n");
 759                 }
 760         }
 761 }
 762
 763 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 764 {
 765         struct xtables_match *xt_m;
 766         struct xt_entry_match *match;
 767
 768         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 769                 return;
 770
 771         match = (struct xt_entry_match *) entry->elems;
 772
 773         if (!strlen(match->u.user.name))
 774                 return;
 775
 776         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 777         if (xt_m == NULL)
 778                 goto out;
 779
 780         if(xt_m->print != NULL) {
 781                 printf("\tmatch ");
 782                 xt_m->print(NULL, match, 1);
 783                 printf("\n");
 784
 785                 return;
 786         }
 787
 788 out:
 789         printf("\tmatch %s\n", match->u.user.name);
 790
 791 }
 792
 793 static int connman_iptables_dump_entry(struct ipt_entry *entry,
 794                                         struct connman_iptables *table)
 795 {
 796         struct xt_entry_target *target;
 797         unsigned int offset;
 798         int builtin;
 799
 800         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 801         target = ipt_get_target(entry);
 802         builtin = is_hook_entry(table, entry);
 803
 804         if (entry_to_offset(table, entry) + entry->next_offset ==
 805                                         table->blob_entries->size) {
 806                 printf("End of CHAIN 0x%x\n", offset);
 807                 return 0;
 808         }
 809
 810         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 811                 printf("USER CHAIN (%s) %p  match %p  target %p  size %d\n",
 812                         target->data, entry, entry->elems,
 813                         (char *)entry + entry->target_offset,
 814                                 entry->next_offset);
 815
 816                 return 0;
 817         } else if (builtin >= 0) {
 818                 printf("CHAIN (%s) %p  match %p  target %p  size %d\n",
 819                         hooknames[builtin], entry, entry->elems,
 820                         (char *)entry + entry->target_offset,
 821                                 entry->next_offset);
 822         } else {
 823                 printf("RULE %p  match %p  target %p  size %d\n", entry,
 824                         entry->elems,
 825                         (char *)entry + entry->target_offset,
 826                                 entry->next_offset);
 827         }
 828
 829         dump_match(table, entry);
 830         dump_target(table, entry);
 831
 832         return 0;
 833 }
 834
 835 static void connman_iptables_dump_hook(struct connman_iptables *table)
 836 {
 837         int i;
 838         printf("hooks: \n");
 839         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 840                 if ((table->info->valid_hooks & (1 << i)))
 841                         printf("%s entry %p underflow %p (%#x)\n",
 842                                 hooknames[i],
 843                                 table->blob_entries->entrytable +
 844                                                 table->info->hook_entry[i],
 845                                 table->blob_entries->entrytable +
 846                                                 table->info->underflow[i],
 847                                         table->info->underflow[i]);
 848         }
 849 }
 850
 851 static void connman_iptables_dump(struct connman_iptables *table)
 852 {
 853         printf("%s valid_hooks=0x%08x, num_entries=%u, size=%u\n",
 854                 table->info->name,
 855                 table->info->valid_hooks, table->info->num_entries,
 856                 table->info->size);
 857
 858         connman_iptables_dump_hook(table);
 859
 860         ENTRY_ITERATE(table->blob_entries->entrytable,
 861                         table->blob_entries->size,
 862                         connman_iptables_dump_entry, table);
 863
 864 }
 865
 866 static int connman_iptables_get_entries(struct connman_iptables *table)
 867 {
 868         socklen_t entry_size;
 869
 870         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 871
 872         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 873                                 table->blob_entries, &entry_size);
 874 }
 875
 876 static int connman_iptables_replace(struct connman_iptables *table,
 877                                         struct ipt_replace *r)
 878 {
 879         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 880                          sizeof(*r) + r->size);
 881 }
 882
 883 static void connman_iptables_cleanup(struct connman_iptables *table)
 884 {
 885         GList *list;
 886         struct connman_iptables_entry *entry;
 887
 888         close(table->ipt_sock);
 889
 890         for (list = table->entries; list; list = list->next) {
 891                 entry = list->data;
 892
 893                 g_free(entry->entry);
 894         }
 895
 896         g_free(table->info);
 897         g_free(table->blob_entries);
 898         g_free(table);
 899
 900         xtables_free_opts(1);
 901 }
 902
 903 static int connman_iptables_commit(struct connman_iptables *table)
 904 {
 905         struct ipt_replace *repl;
 906
 907         repl = connman_iptables_blob(table);
 908
 909         return connman_iptables_replace(table, repl);
 910 }
 911
 912 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 913 {
 914         struct ipt_entry *new_entry;
 915         int builtin;
 916
 917         new_entry = g_try_malloc0(entry->next_offset);
 918         if (new_entry == NULL)
 919                 return -ENOMEM;
 920
 921         memcpy(new_entry, entry, entry->next_offset);
 922
 923         builtin = is_hook_entry(table, entry);
 924
 925         return connman_add_entry(table, new_entry, NULL, builtin);
 926 }
 927
 928 static struct connman_iptables *connman_iptables_init(const char *table_name)
 929 {
 930         struct connman_iptables *table;
 931         socklen_t s;
 932
 933         table =  g_try_new0(struct connman_iptables, 1);
 934         if (table == NULL)
 935                 return NULL;
 936
 937         table->info =  g_try_new0(struct ipt_getinfo, 1);
 938         if (table->info == NULL)
 939                 goto err;
 940
 941         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 942         if (table->ipt_sock < 0)
 943                 goto err;
 944
 945         s = sizeof(*table->info);
 946         strcpy(table->info->name, table_name);
 947         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 948                                                 table->info, &s) < 0)
 949                 goto err;
 950
 951         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 952                                                 table->info->size);
 953         if (table->blob_entries == NULL)
 954                 goto err;
 955
 956         strcpy(table->blob_entries->name, table_name);
 957         table->blob_entries->size = table->info->size;
 958
 959         if (connman_iptables_get_entries(table) < 0)
 960                 goto err;
 961
 962         table->num_entries = 0;
 963         table->old_entries = table->info->num_entries;
 964         table->size = 0;
 965
 966         memcpy(table->underflow, table->info->underflow,
 967                                 sizeof(table->info->underflow));
 968         memcpy(table->hook_entry, table->info->hook_entry,
 969                                 sizeof(table->info->hook_entry));
 970
 971         ENTRY_ITERATE(table->blob_entries->entrytable,
 972                         table->blob_entries->size,
 973                                 add_entry, table);
 974
 975
 976         return table;
 977
 978 err:
 979
 980         connman_iptables_cleanup(table);
 981
 982         return NULL;
 983 }
 984
 985
 986 static struct option connman_iptables_opts[] = {
 987         {.name = "append",        .has_arg = 1, .val = 'A'},
 988         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
 989         {.name = "list",          .has_arg = 2, .val = 'L'},
 990         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 991         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
 992         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 993         {.name = "jump",          .has_arg = 1, .val = 'j'},
 994         {.name = "match",         .has_arg = 1, .val = 'm'},
 995         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 996         {.name = "table",         .has_arg = 1, .val = 't'},
 997         {NULL},
 998 };
 999
1000 struct xtables_globals connman_iptables_globals = {
1001         .option_offset = 0,
1002         .opts = connman_iptables_opts,
1003         .orig_opts = connman_iptables_opts,
1004 };
1005
1006 int main(int argc, char *argv[])
1007 {
1008         struct connman_iptables *table;
1009         struct xtables_match *xt_m;
1010         struct xtables_target *xt_t;
1011         char *table_name, *chain, *new_chain, *match_name, *target_name;
1012         char *delete_chain, *flush_chain;
1013         int c;
1014         size_t size;
1015         gboolean dump, invert, delete;
1016
1017         xtables_init_all(&connman_iptables_globals, NFPROTO_IPV4);
1018
1019         dump = FALSE;
1020         invert = FALSE;
1021         delete = FALSE;
1022         table_name = chain = new_chain = match_name = target_name = NULL;
1023         delete_chain = flush_chain = NULL;
1024         table = NULL;
1025         xt_m = NULL;
1026         xt_t = NULL;
1027
1028         while ((c = getopt_long(argc, argv,
1029            "-A:F:L::N:X:j:i:m:o:t:", connman_iptables_globals.opts, NULL)) != -1) {
1030                 switch (c) {
1031                 case 'A':
1032                         chain = optarg;
1033                         break;
1034
1035                 case 'F':
1036                         flush_chain = optarg;
1037                         break;
1038
1039                 case 'L':
1040                         dump = true;
1041                         break;
1042
1043                 case 'N':
1044                         new_chain = optarg;
1045                         break;
1046
1047                 case 'X':
1048                         delete = true;
1049                         delete_chain = optarg;
1050                         break;
1051
1052                 case 'j':
1053                         target_name = optarg;
1054                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1055
1056                         if (xt_t == NULL)
1057                                 break;
1058
1059                         size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1060
1061                         xt_t->t = g_try_malloc0(size);
1062                         if (xt_t->t == NULL)
1063                                 goto out;
1064                         xt_t->t->u.target_size = size;
1065                         strcpy(xt_t->t->u.user.name, target_name);
1066                         xt_t->t->u.user.revision = xt_t->revision;
1067                         if (xt_t->init != NULL)
1068                                 xt_t->init(xt_t->t);
1069                         connman_iptables_globals.opts =
1070                                 xtables_merge_options(
1071 #if XTABLES_VERSION_CODE > 5
1072                                                      connman_iptables_globals.orig_opts,
1073 #endif
1074                                                      connman_iptables_globals.opts,
1075                                                      xt_t->extra_opts,
1076                                                      &xt_t->option_offset);
1077                         if (connman_iptables_globals.opts == NULL)
1078                                 goto out;
1079
1080                         break;
1081
1082                 case 'i':
1083                         break;
1084
1085                 case 'm':
1086                         match_name = optarg;
1087
1088                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1089                         size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1090                         xt_m->m = g_try_malloc0(size);
1091                         if (xt_m == NULL)
1092                                 goto out;
1093                         xt_m->m->u.match_size = size;
1094                         strcpy(xt_m->m->u.user.name, xt_m->name);
1095                         xt_m->m->u.user.revision = xt_m->revision;
1096                         if (xt_m->init != NULL)
1097                                 xt_m->init(xt_m->m);
1098                         if (xt_m != xt_m->next) {
1099                                 connman_iptables_globals.opts =
1100                                         xtables_merge_options(
1101 #if XTABLES_VERSION_CODE > 5
1102                                                 connman_iptables_globals.orig_opts,
1103 #endif
1104                                                 connman_iptables_globals.opts,
1105                                                 xt_m->extra_opts,
1106                                                 &xt_m->option_offset);
1107                                 if (connman_iptables_globals.opts == NULL)
1108                                         goto out;
1109                         }
1110
1111                         break;
1112
1113                 case 'o':
1114                         break;
1115
1116                 case 't':
1117                         table_name = optarg;
1118                         break;
1119
1120                 case 1:
1121                         if (optarg[0] == '!' && optarg[1] == '\0') {
1122                                 if (invert)
1123                                         printf("Consecutive ! not allowed\n");
1124
1125                                 invert = TRUE;
1126                                 optarg[0] = '\0';
1127                                 continue;
1128                         }
1129
1130                         printf("Invalid option\n");
1131
1132                         return -1;
1133
1134                 default:
1135                         if (xt_t == NULL || xt_t->parse == NULL ||
1136                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1137                                         &xt_t->tflags, NULL, &xt_t->t)) {
1138                                 if (xt_m == NULL || xt_m->parse == NULL)
1139                                         break;
1140
1141                                 xt_m->parse(c - xt_m->option_offset, argv,
1142                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1143                         }
1144
1145                         break;
1146                 }
1147         }
1148
1149         if (table_name == NULL)
1150                 table_name = "filter";
1151
1152         table = connman_iptables_init(table_name);
1153         if (table == NULL)
1154                 return -1;
1155
1156         if (delete) {
1157                 if (delete_chain == NULL)
1158                         goto out;
1159
1160                 printf("Delete chain %s\n", delete_chain);
1161
1162                 connman_iptables_delete_chain(table, delete_chain);
1163
1164                 goto commit;
1165         }
1166
1167         if (flush_chain) {
1168                 printf("Flush chain %s\n", flush_chain);
1169
1170                 connman_iptables_flush_chain(table, flush_chain);
1171
1172                 goto commit;
1173         }
1174
1175         if (dump) {
1176                 connman_iptables_dump(table);
1177
1178                 return 0;
1179         }
1180
1181         if (chain && new_chain)
1182                 return -1;
1183
1184         if (new_chain) {
1185                 printf("New chain %s\n", new_chain);
1186
1187                 connman_iptables_add_chain(table, new_chain);
1188
1189                 goto commit;
1190         }
1191
1192         if (chain) {
1193                 if (target_name == NULL)
1194                         return -1;
1195
1196                 printf("Adding %s to %s (match %s)\n", target_name, chain, match_name);
1197
1198                 connman_iptables_add_rule(table, chain, target_name, xt_t,
1199                                         match_name, xt_m);
1200
1201                 goto commit;
1202         }
1203
1204 commit:
1205
1206         connman_iptables_commit(table);
1207
1208 out:
1209         connman_iptables_cleanup(table);
1210
1211         if (xt_t)
1212                 g_free(xt_t->t);
1213
1214         if (xt_m)
1215                 g_free(xt_m->m);
1216
1217         return 0;
1218 }