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 connman_iptables_flush_chain(struct connman_iptables *table,
 331                                                 char *name)
 332 {
 333         GList *chain_head, *chain_tail, *list, *next;
 334         struct connman_iptables_entry *entry;
 335         int builtin, removed = 0;
 336
 337         chain_head = find_chain_head(table, name);
 338         if (chain_head == NULL)
 339                 return -EINVAL;
 340
 341         chain_tail = find_chain_tail(table, name);
 342         if (chain_tail == NULL)
 343                 return -EINVAL;
 344
 345         entry = chain_head->data;
 346         builtin = entry->builtin;
 347
 348         if (builtin >= 0)
 349                 list = chain_head;
 350         else
 351                 list = chain_head->next;
 352
 353         if (list == chain_tail->prev)
 354                 return 0;
 355
 356         while (list != chain_tail->prev) {
 357                 entry = list->data;
 358                 next = g_list_next(list);
 359
 360                 table->num_entries--;
 361                 table->size -= entry->entry->next_offset;
 362                 removed += entry->entry->next_offset;
 363
 364                 table->entries = g_list_remove(table->entries, list->data);
 365
 366                 list = next;
 367         }
 368
 369         if (builtin >= 0) {
 370                 struct connman_iptables_entry *e;
 371
 372                 entry = list->data;
 373
 374                 entry->builtin = builtin;
 375
 376                 table->underflow[builtin] -= removed;
 377
 378                 for (list = chain_tail; list; list = list->next) {
 379                         e = list->data;
 380
 381                         builtin = e->builtin;
 382                         if (builtin < 0)
 383                                 continue;
 384
 385                         table->hook_entry[builtin] -= removed;
 386                         table->underflow[builtin] -= removed;
 387                 }
 388         }
 389
 390         update_offsets(table);
 391
 392         return 0;
 393 }
 394
 395 static int connman_iptables_delete_chain(struct connman_iptables *table,
 396                                                 char *name)
 397 {
 398         GList *chain_head, *chain_tail, *list, *next;
 399         struct connman_iptables_entry *entry;
 400
 401         chain_head = find_chain_head(table, name);
 402         if (chain_head == NULL)
 403                 return -EINVAL;
 404
 405         chain_tail = find_chain_tail(table, name);
 406         if (chain_tail == NULL)
 407                 return -EINVAL;
 408
 409         list = chain_head;
 410
 411         while (list != chain_tail) {
 412                 entry = list->data;
 413                 next = g_list_next(list);
 414
 415                 table->num_entries--;
 416                 table->size -= entry->entry->next_offset;
 417
 418                 table->entries = g_list_remove(table->entries, list->data);
 419
 420                 list = next;
 421         }
 422
 423         update_offsets(table);
 424
 425         return 0;
 426 }
 427
 428 static int connman_iptables_add_chain(struct connman_iptables *table,
 429                                         char *name)
 430 {
 431         GList *last;
 432         struct ipt_entry *entry_head;
 433         struct ipt_entry *entry_return;
 434         struct error_target *error;
 435         struct ipt_standard_target *standard;
 436         u_int16_t entry_head_size, entry_return_size;
 437
 438         last = g_list_last(table->entries);
 439
 440         /*
 441          * An empty chain is composed of:
 442          * - A head entry, with no match and an error target.
 443          *   The error target data is the chain name.
 444          * - A tail entry, with no match and a standard target.
 445          *   The standard target verdict is XT_RETURN (return to the
 446          *   caller).
 447          */
 448
 449         /* head entry */
 450         entry_head_size = sizeof(struct ipt_entry) +
 451                                 sizeof(struct error_target);
 452         entry_head = g_try_malloc0(entry_head_size);
 453         if (entry_head == NULL)
 454                 goto err_head;
 455
 456         memset(entry_head, 0, entry_head_size);
 457
 458         entry_head->target_offset = sizeof(struct ipt_entry);
 459         entry_head->next_offset = entry_head_size;
 460
 461         error = (struct error_target *) entry_head->elems;
 462         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 463         error->t.u.user.target_size = ALIGN(sizeof(struct error_target));
 464         strcpy(error->error, name);
 465
 466         if (connman_add_entry(table, entry_head, last, -1) < 0)
 467                 goto err_head;
 468
 469         /* tail entry */
 470         entry_return_size = sizeof(struct ipt_entry) +
 471                                 sizeof(struct ipt_standard_target);
 472         entry_return = g_try_malloc0(entry_return_size);
 473         if (entry_return == NULL)
 474                 goto err;
 475
 476         memset(entry_return, 0, entry_return_size);
 477
 478         entry_return->target_offset = sizeof(struct ipt_entry);
 479         entry_return->next_offset = entry_return_size;
 480
 481         standard = (struct ipt_standard_target *) entry_return->elems;
 482         standard->target.u.user.target_size =
 483                                 ALIGN(sizeof(struct ipt_standard_target));
 484         standard->verdict = XT_RETURN;
 485
 486         if (connman_add_entry(table, entry_return, last, -1) < 0)
 487                 goto err;
 488
 489         return 0;
 490
 491 err:
 492         g_free(entry_return);
 493 err_head:
 494         g_free(entry_head);
 495
 496         return -ENOMEM;
 497 }
 498
 499 static struct ipt_entry *
 500 new_rule(struct connman_iptables *table,
 501                 char *target_name, struct xtables_target *xt_t,
 502                 char *match_name, struct xtables_match *xt_m)
 503 {
 504         struct ipt_entry *new_entry;
 505         size_t match_size, target_size;
 506         int is_builtin = is_builtin_target(target_name);
 507
 508         if (xt_m)
 509                 match_size = xt_m->m->u.match_size;
 510         else
 511                 match_size = 0;
 512
 513         if (xt_t)
 514                 target_size = ALIGN(xt_t->t->u.target_size);
 515         else
 516                 target_size = ALIGN(sizeof(struct xt_standard_target));
 517
 518         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 519                                                                 match_size);
 520         if (new_entry == NULL)
 521                 return NULL;
 522
 523         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 524         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 525                                                                 match_size;
 526         if (xt_m) {
 527                 struct xt_entry_match *entry_match;
 528
 529                 entry_match = (struct xt_entry_match *)new_entry->elems;
 530                 memcpy(entry_match, xt_m->m, match_size);
 531         }
 532
 533         if (xt_t) {
 534                 struct xt_entry_target *entry_target;
 535
 536                 if (is_builtin) {
 537                         struct xt_standard_target *target;
 538
 539                         target = (struct xt_standard_target *)(xt_t->t);
 540                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 541                         target->verdict = target_to_verdict(target_name);
 542                 }
 543
 544                 entry_target = ipt_get_target(new_entry);
 545                 memcpy(entry_target, xt_t->t, target_size);
 546         } else {
 547                 struct connman_iptables_entry *target_rule;
 548                 struct xt_standard_target *target;
 549                 GList *chain_head;
 550
 551                 /*
 552                  * This is a user defined target, i.e. a chain jump.
 553                  * We search for the chain head, and the target verdict
 554                  * is the first rule's offset on this chain.
 555                  * The offset is from the beginning of the table.
 556                  */
 557
 558                 chain_head = find_chain_head(table, target_name);
 559                 if (chain_head == NULL || chain_head->next == NULL) {
 560                         g_free(new_entry);
 561                         return NULL;
 562                 }
 563
 564                 target_rule = chain_head->next->data;
 565
 566                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 567                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 568                 target->target.u.user.target_size = target_size;
 569                 target->verdict = target_rule->offset;
 570         }
 571
 572         return new_entry;
 573 }
 574
 575 static void update_hooks(struct connman_iptables *table, GList *chain_head, struct ipt_entry *entry)
 576 {
 577         GList *list;
 578         struct connman_iptables_entry *head, *e;
 579         int builtin;
 580
 581         if (chain_head == NULL)
 582                 return;
 583
 584         head = chain_head->data;
 585
 586         builtin = head->builtin;
 587         if (builtin < 0)
 588                 return;
 589
 590         table->underflow[builtin] += entry->next_offset;
 591
 592         for (list = chain_head->next; list; list = list->next) {
 593                 e = list->data;
 594
 595                 builtin = e->builtin;
 596                 if (builtin < 0)
 597                         continue;
 598
 599                 table->hook_entry[builtin] += entry->next_offset;
 600                 table->underflow[builtin] += entry->next_offset;
 601         }
 602 }
 603
 604 static int
 605 connman_iptables_add_rule(struct connman_iptables *table, char *chain_name,
 606                                 char *target_name, struct xtables_target *xt_t,
 607                                 char *match_name, struct xtables_match *xt_m)
 608 {
 609         GList *chain_tail, *chain_head;
 610         struct ipt_entry *new_entry;
 611         struct connman_iptables_entry *head;
 612         int builtin = -1;
 613
 614         chain_head = find_chain_head(table, chain_name);
 615         if (chain_head == NULL)
 616                 return -EINVAL;
 617
 618         chain_tail = find_chain_tail(table, chain_name);
 619         if (chain_tail == NULL)
 620                 return -EINVAL;
 621
 622         new_entry = new_rule(table,
 623                                 target_name, xt_t,
 624                                 match_name, xt_m);
 625         if (new_entry == NULL)
 626                 return -EINVAL;
 627
 628         update_hooks(table, chain_head, new_entry);
 629
 630         /*
 631          * If the chain is builtin, and does not have any rule,
 632          * then the one that we're inserting is becoming the head
 633          * and thus needs the builtin flag.
 634          */
 635         head = chain_head->data;
 636         if (head->builtin < 0)
 637                 builtin = -1;
 638         else if (chain_head == chain_tail->prev) {
 639                 builtin = head->builtin;
 640                 head->builtin = -1;
 641         }
 642
 643         return connman_add_entry(table, new_entry, chain_tail->prev, builtin);
 644 }
 645
 646 static struct ipt_replace *
 647 connman_iptables_blob(struct connman_iptables *table)
 648 {
 649         struct ipt_replace *r;
 650         GList *list;
 651         struct connman_iptables_entry *e;
 652         unsigned char *entry_index;
 653
 654         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 655         if (r == NULL)
 656                 return NULL;
 657
 658         memset(r, 0, sizeof(*r) + table->size);
 659
 660         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 661                                 * table->old_entries);
 662         if (r->counters == NULL) {
 663                 g_free(r);
 664                 return NULL;
 665         }
 666
 667         strcpy(r->name, table->info->name);
 668         r->num_entries = table->num_entries;
 669         r->size = table->size;
 670
 671         r->num_counters = table->old_entries;
 672         r->valid_hooks  = table->info->valid_hooks;
 673
 674         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 675         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 676
 677         entry_index = (unsigned char *)r->entries;
 678         for (list = table->entries; list; list = list->next) {
 679                 e = list->data;
 680
 681                 memcpy(entry_index, e->entry, e->entry->next_offset);
 682                 entry_index += e->entry->next_offset;
 683         }
 684
 685         return r;
 686 }
 687
 688 static void dump_target(struct connman_iptables *table,
 689                                 struct ipt_entry *entry)
 690
 691 {
 692         struct xtables_target *xt_t;
 693         struct xt_entry_target *target;
 694
 695         target = ipt_get_target(entry);
 696
 697         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 698                 struct xt_standard_target *t;
 699
 700                 t = (struct xt_standard_target *)target;
 701
 702                 switch (t->verdict) {
 703                 case XT_RETURN:
 704                         printf("\ttarget RETURN\n");
 705                         break;
 706
 707                 case -NF_ACCEPT - 1:
 708                         printf("\ttarget ACCEPT\n");
 709                         break;
 710
 711                 case -NF_DROP - 1:
 712                         printf("\ttarget DROP\n");
 713                         break;
 714
 715                 case -NF_QUEUE - 1:
 716                         printf("\ttarget QUEUE\n");
 717                         break;
 718
 719                 case -NF_STOP - 1:
 720                         printf("\ttarget STOP\n");
 721                         break;
 722
 723                 default:
 724                         printf("\tJUMP @%p (0x%x)\n",
 725                                 (char*)table->blob_entries->entrytable +
 726                                 t->verdict, t->verdict);
 727                         break;
 728                 }
 729
 730                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 731                                                 XTF_LOAD_MUST_SUCCEED);
 732
 733                 if(xt_t->print != NULL)
 734                         xt_t->print(NULL, target, 1);
 735         } else {
 736                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 737                 if (xt_t == NULL) {
 738                         printf("\ttarget %s\n", target->u.user.name);
 739                         return;
 740                 }
 741
 742                 if(xt_t->print != NULL) {
 743                         printf("\ttarget ");
 744                         xt_t->print(NULL, target, 1);
 745                         printf("\n");
 746                 }
 747         }
 748 }
 749
 750 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 751 {
 752         struct xtables_match *xt_m;
 753         struct xt_entry_match *match;
 754
 755         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 756                 return;
 757
 758         match = (struct xt_entry_match *) entry->elems;
 759
 760         if (!strlen(match->u.user.name))
 761                 return;
 762
 763         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 764         if (xt_m == NULL)
 765                 goto out;
 766
 767         if(xt_m->print != NULL) {
 768                 printf("\tmatch ");
 769                 xt_m->print(NULL, match, 1);
 770                 printf("\n");
 771
 772                 return;
 773         }
 774
 775 out:
 776         printf("\tmatch %s\n", match->u.user.name);
 777
 778 }
 779
 780 static int connman_iptables_dump_entry(struct ipt_entry *entry,
 781                                         struct connman_iptables *table)
 782 {
 783         struct xt_entry_target *target;
 784         unsigned int offset;
 785         int builtin;
 786
 787         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 788         target = ipt_get_target(entry);
 789         builtin = is_hook_entry(table, entry);
 790
 791         if (entry_to_offset(table, entry) + entry->next_offset ==
 792                                         table->blob_entries->size) {
 793                 printf("End of CHAIN 0x%x\n", offset);
 794                 return 0;
 795         }
 796
 797         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 798                 printf("USER CHAIN (%s) %p  match %p  target %p  size %d\n",
 799                         target->data, entry, entry->elems,
 800                         (char *)entry + entry->target_offset,
 801                                 entry->next_offset);
 802
 803                 return 0;
 804         } else if (builtin >= 0) {
 805                 printf("CHAIN (%s) %p  match %p  target %p  size %d\n",
 806                         hooknames[builtin], entry, entry->elems,
 807                         (char *)entry + entry->target_offset,
 808                                 entry->next_offset);
 809         } else {
 810                 printf("RULE %p  match %p  target %p  size %d\n", entry,
 811                         entry->elems,
 812                         (char *)entry + entry->target_offset,
 813                                 entry->next_offset);
 814         }
 815
 816         dump_match(table, entry);
 817         dump_target(table, entry);
 818
 819         return 0;
 820 }
 821
 822 static void connman_iptables_dump_hook(struct connman_iptables *table)
 823 {
 824         int i;
 825         printf("hooks: \n");
 826         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 827                 if ((table->info->valid_hooks & (1 << i)))
 828                         printf("%s entry %p underflow %p (%#x)\n",
 829                                 hooknames[i],
 830                                 table->blob_entries->entrytable +
 831                                                 table->info->hook_entry[i],
 832                                 table->blob_entries->entrytable +
 833                                                 table->info->underflow[i],
 834                                         table->info->underflow[i]);
 835         }
 836 }
 837
 838 static void connman_iptables_dump(struct connman_iptables *table)
 839 {
 840         printf("%s valid_hooks=0x%08x, num_entries=%u, size=%u\n",
 841                 table->info->name,
 842                 table->info->valid_hooks, table->info->num_entries,
 843                 table->info->size);
 844
 845         connman_iptables_dump_hook(table);
 846
 847         ENTRY_ITERATE(table->blob_entries->entrytable,
 848                         table->blob_entries->size,
 849                         connman_iptables_dump_entry, table);
 850
 851 }
 852
 853 static int connman_iptables_get_entries(struct connman_iptables *table)
 854 {
 855         socklen_t entry_size;
 856
 857         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 858
 859         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 860                                 table->blob_entries, &entry_size);
 861 }
 862
 863 static int connman_iptables_replace(struct connman_iptables *table,
 864                                         struct ipt_replace *r)
 865 {
 866         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 867                          sizeof(*r) + r->size);
 868 }
 869
 870 static void connman_iptables_cleanup(struct connman_iptables *table)
 871 {
 872         GList *list;
 873         struct connman_iptables_entry *entry;
 874
 875         close(table->ipt_sock);
 876
 877         for (list = table->entries; list; list = list->next) {
 878                 entry = list->data;
 879
 880                 g_free(entry->entry);
 881         }
 882
 883         g_free(table->info);
 884         g_free(table->blob_entries);
 885         g_free(table);
 886
 887         xtables_free_opts(1);
 888 }
 889
 890 static int connman_iptables_commit(struct connman_iptables *table)
 891 {
 892         struct ipt_replace *repl;
 893
 894         repl = connman_iptables_blob(table);
 895
 896         return connman_iptables_replace(table, repl);
 897 }
 898
 899 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 900 {
 901         struct ipt_entry *new_entry;
 902         int builtin;
 903
 904         new_entry = g_try_malloc0(entry->next_offset);
 905         if (new_entry == NULL)
 906                 return -ENOMEM;
 907
 908         memcpy(new_entry, entry, entry->next_offset);
 909
 910         builtin = is_hook_entry(table, entry);
 911
 912         return connman_add_entry(table, new_entry, NULL, builtin);
 913 }
 914
 915 static struct connman_iptables *connman_iptables_init(const char *table_name)
 916 {
 917         struct connman_iptables *table;
 918         socklen_t s;
 919
 920         table =  g_try_new0(struct connman_iptables, 1);
 921         if (table == NULL)
 922                 return NULL;
 923
 924         table->info =  g_try_new0(struct ipt_getinfo, 1);
 925         if (table->info == NULL)
 926                 goto err;
 927
 928         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 929         if (table->ipt_sock < 0)
 930                 goto err;
 931
 932         s = sizeof(*table->info);
 933         strcpy(table->info->name, table_name);
 934         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 935                                                 table->info, &s) < 0)
 936                 goto err;
 937
 938         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 939                                                 table->info->size);
 940         if (table->blob_entries == NULL)
 941                 goto err;
 942
 943         strcpy(table->blob_entries->name, table_name);
 944         table->blob_entries->size = table->info->size;
 945
 946         if (connman_iptables_get_entries(table) < 0)
 947                 goto err;
 948
 949         table->num_entries = 0;
 950         table->old_entries = table->info->num_entries;
 951         table->size = 0;
 952
 953         memcpy(table->underflow, table->info->underflow,
 954                                 sizeof(table->info->underflow));
 955         memcpy(table->hook_entry, table->info->hook_entry,
 956                                 sizeof(table->info->hook_entry));
 957
 958         ENTRY_ITERATE(table->blob_entries->entrytable,
 959                         table->blob_entries->size,
 960                                 add_entry, table);
 961
 962
 963         return table;
 964
 965 err:
 966
 967         connman_iptables_cleanup(table);
 968
 969         return NULL;
 970 }
 971
 972
 973 static struct option connman_iptables_opts[] = {
 974         {.name = "append",        .has_arg = 1, .val = 'A'},
 975         {.name = "flush-chain",   .has_arg = 1, .val = 'F'},
 976         {.name = "list",          .has_arg = 2, .val = 'L'},
 977         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 978         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
 979         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 980         {.name = "jump",          .has_arg = 1, .val = 'j'},
 981         {.name = "match",         .has_arg = 1, .val = 'm'},
 982         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 983         {.name = "table",         .has_arg = 1, .val = 't'},
 984         {NULL},
 985 };
 986
 987 struct xtables_globals connman_iptables_globals = {
 988         .option_offset = 0,
 989         .opts = connman_iptables_opts,
 990         .orig_opts = connman_iptables_opts,
 991 };
 992
 993 int main(int argc, char *argv[])
 994 {
 995         struct connman_iptables *table;
 996         struct xtables_match *xt_m;
 997         struct xtables_target *xt_t;
 998         char *table_name, *chain, *new_chain, *match_name, *target_name;
 999         char *delete_chain, *flush_chain;
1000         int c;
1001         size_t size;
1002         gboolean dump, invert, delete;
1003
1004         xtables_init_all(&connman_iptables_globals, NFPROTO_IPV4);
1005
1006         dump = FALSE;
1007         invert = FALSE;
1008         delete = FALSE;
1009         table_name = chain = new_chain = match_name = target_name = NULL;
1010         delete_chain = flush_chain = NULL;
1011         table = NULL;
1012         xt_m = NULL;
1013         xt_t = NULL;
1014
1015         while ((c = getopt_long(argc, argv,
1016            "-A:F:L::N:X:j:i:m:o:t:", connman_iptables_globals.opts, NULL)) != -1) {
1017                 switch (c) {
1018                 case 'A':
1019                         chain = optarg;
1020                         break;
1021
1022                 case 'F':
1023                         flush_chain = optarg;
1024                         break;
1025
1026                 case 'L':
1027                         dump = true;
1028                         break;
1029
1030                 case 'N':
1031                         new_chain = optarg;
1032                         break;
1033
1034                 case 'X':
1035                         delete = true;
1036                         delete_chain = optarg;
1037                         break;
1038
1039                 case 'j':
1040                         target_name = optarg;
1041                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
1042
1043                         if (xt_t == NULL)
1044                                 break;
1045
1046                         size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
1047
1048                         xt_t->t = g_try_malloc0(size);
1049                         if (xt_t->t == NULL)
1050                                 goto out;
1051                         xt_t->t->u.target_size = size;
1052                         strcpy(xt_t->t->u.user.name, target_name);
1053                         xt_t->t->u.user.revision = xt_t->revision;
1054                         if (xt_t->init != NULL)
1055                                 xt_t->init(xt_t->t);
1056                         connman_iptables_globals.opts =
1057                                 xtables_merge_options(
1058 #if XTABLES_VERSION_CODE > 5
1059                                                      connman_iptables_globals.orig_opts,
1060 #endif
1061                                                      connman_iptables_globals.opts,
1062                                                      xt_t->extra_opts,
1063                                                      &xt_t->option_offset);
1064                         if (connman_iptables_globals.opts == NULL)
1065                                 goto out;
1066
1067                         break;
1068
1069                 case 'i':
1070                         break;
1071
1072                 case 'm':
1073                         match_name = optarg;
1074
1075                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1076                         size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1077                         xt_m->m = g_try_malloc0(size);
1078                         if (xt_m == NULL)
1079                                 goto out;
1080                         xt_m->m->u.match_size = size;
1081                         strcpy(xt_m->m->u.user.name, xt_m->name);
1082                         xt_m->m->u.user.revision = xt_m->revision;
1083                         if (xt_m->init != NULL)
1084                                 xt_m->init(xt_m->m);
1085                         if (xt_m != xt_m->next) {
1086                                 connman_iptables_globals.opts =
1087                                         xtables_merge_options(
1088 #if XTABLES_VERSION_CODE > 5
1089                                                 connman_iptables_globals.orig_opts,
1090 #endif
1091                                                 connman_iptables_globals.opts,
1092                                                 xt_m->extra_opts,
1093                                                 &xt_m->option_offset);
1094                                 if (connman_iptables_globals.opts == NULL)
1095                                         goto out;
1096                         }
1097
1098                         break;
1099
1100                 case 'o':
1101                         break;
1102
1103                 case 't':
1104                         table_name = optarg;
1105                         break;
1106
1107                 case 1:
1108                         if (optarg[0] == '!' && optarg[1] == '\0') {
1109                                 if (invert)
1110                                         printf("Consecutive ! not allowed\n");
1111
1112                                 invert = TRUE;
1113                                 optarg[0] = '\0';
1114                                 continue;
1115                         }
1116
1117                         printf("Invalid option\n");
1118
1119                         return -1;
1120
1121                 default:
1122                         if (xt_t == NULL || xt_t->parse == NULL ||
1123                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1124                                         &xt_t->tflags, NULL, &xt_t->t)) {
1125                                 if (xt_m == NULL || xt_m->parse == NULL)
1126                                         break;
1127
1128                                 xt_m->parse(c - xt_m->option_offset, argv,
1129                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1130                         }
1131
1132                         break;
1133                 }
1134         }
1135
1136         if (table_name == NULL)
1137                 table_name = "filter";
1138
1139         table = connman_iptables_init(table_name);
1140         if (table == NULL)
1141                 return -1;
1142
1143         if (delete) {
1144                 if (delete_chain == NULL)
1145                         goto out;
1146
1147                 printf("Delete chain %s\n", delete_chain);
1148
1149                 connman_iptables_delete_chain(table, delete_chain);
1150
1151                 goto commit;
1152         }
1153
1154         if (flush_chain) {
1155                 printf("Flush chain %s\n", flush_chain);
1156
1157                 connman_iptables_flush_chain(table, flush_chain);
1158
1159                 goto commit;
1160         }
1161
1162         if (dump) {
1163                 connman_iptables_dump(table);
1164
1165                 return 0;
1166         }
1167
1168         if (chain && new_chain)
1169                 return -1;
1170
1171         if (new_chain) {
1172                 printf("New chain %s\n", new_chain);
1173
1174                 connman_iptables_add_chain(table, new_chain);
1175
1176                 goto commit;
1177         }
1178
1179         if (chain) {
1180                 if (target_name == NULL)
1181                         return -1;
1182
1183                 printf("Adding %s to %s (match %s)\n", target_name, chain, match_name);
1184
1185                 connman_iptables_add_rule(table, chain, target_name, xt_t,
1186                                         match_name, xt_m);
1187
1188                 goto commit;
1189         }
1190
1191 commit:
1192
1193         connman_iptables_commit(table);
1194
1195 out:
1196         connman_iptables_cleanup(table);
1197
1198         if (xt_t)
1199                 g_free(xt_t->t);
1200
1201         if (xt_m)
1202                 g_free(xt_m->m);
1203
1204         return 0;
1205 }