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 ipt_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 *head, *tail;
 240         struct ipt_entry *entry;
 241         struct xt_entry_target *target;
 242         int builtin;
 243
 244         /* First we look for the head */
 245         for (list = table->entries; list; list = list->next) {
 246                 head = list->data;
 247                 entry = head->entry;
 248
 249                 /* Buit-in chain */
 250                 builtin = head->builtin;
 251                 if (builtin >= 0 && !strcmp(hooknames[builtin], chain_name))
 252                         break;
 253
 254                 /* User defined chain */
 255                 target = ipt_get_target(entry);
 256                 if (!strcmp(target->u.user.name, IPT_ERROR_TARGET) &&
 257                     !strcmp((char *)target->data, chain_name))
 258                         break;
 259         }
 260
 261         if (list == NULL)
 262                 return NULL;
 263
 264         chain_head = list;
 265
 266         /* Then we look for the next chain */
 267         for (list = chain_head->next; list; list = list->next) {
 268                 tail = list->data;
 269                 entry = tail->entry;
 270
 271                 if (is_chain(table, tail))
 272                         return list;
 273         }
 274
 275         /* Nothing found, we return the table end */
 276         return g_list_last(table->entries);
 277 }
 278
 279 static void update_offsets(struct connman_iptables *table)
 280 {
 281         GList *list, *prev;
 282         struct connman_iptables_entry *entry, *prev_entry;
 283
 284         for (list = table->entries; list; list = list->next) {
 285                 entry = list->data;
 286
 287                 if (list == table->entries) {
 288                         entry->offset = 0;
 289
 290                         continue;
 291                 }
 292
 293                 prev = list->prev;
 294                 prev_entry = prev->data;
 295
 296                 entry->offset = prev_entry->offset +
 297                                         prev_entry->entry->next_offset;
 298         }
 299 }
 300
 301 static int connman_add_entry(struct connman_iptables *table,
 302                                 struct ipt_entry *entry, GList *before,
 303                                         int builtin)
 304 {
 305         GList *list;
 306         struct connman_iptables_entry *e, *tmp, *entry_before;
 307         struct xt_standard_target *t;
 308
 309         if (table == NULL)
 310                 return -1;
 311
 312         e = g_try_malloc0(sizeof(struct connman_iptables_entry));
 313         if (e == NULL)
 314                 return -1;
 315
 316         e->entry = entry;
 317         e->builtin = builtin;
 318
 319         table->entries = g_list_insert_before(table->entries, before, e);
 320         table->num_entries++;
 321         table->size += entry->next_offset;
 322
 323         if (before == NULL) {
 324                 e->offset = table->size - entry->next_offset;
 325
 326                 return 0;
 327         }
 328
 329         entry_before = before->data;
 330
 331         /*
 332          * We've just insterted a new entry. All references before it
 333          * should be bumped accordingly.
 334          */
 335         for (list = table->entries; list != before; list = list->next) {
 336                 tmp = list->data;
 337
 338                 if (!is_jump(tmp))
 339                         continue;
 340
 341                 t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
 342
 343                 if (t->verdict >= entry_before->offset)
 344                         t->verdict += entry->next_offset;
 345         }
 346
 347         update_offsets(table);
 348
 349         return 0;
 350 }
 351
 352 static int connman_iptables_delete_chain(struct connman_iptables *table,
 353                                                 char *name)
 354 {
 355         GList *chain_head, *chain_tail, *list, *next;
 356         struct connman_iptables_entry *entry;
 357
 358         chain_head = find_chain_head(table, name);
 359         if (chain_head == NULL)
 360                 return -EINVAL;
 361
 362         chain_tail = find_chain_tail(table, name);
 363         if (chain_tail == NULL)
 364                 return -EINVAL;
 365
 366         list = chain_head;
 367
 368         while (list != chain_tail) {
 369                 entry = list->data;
 370                 next = g_list_next(list);
 371
 372                 table->num_entries--;
 373                 table->size -= entry->entry->next_offset;
 374
 375                 table->entries = g_list_remove(table->entries, list->data);
 376
 377                 list = next;
 378         }
 379
 380         update_offsets(table);
 381
 382         return 0;
 383 }
 384
 385 static int connman_iptables_add_chain(struct connman_iptables *table,
 386                                         char *name)
 387 {
 388         GList *last;
 389         struct ipt_entry *entry_head;
 390         struct ipt_entry *entry_return;
 391         struct ipt_error_target *error;
 392         struct ipt_standard_target *standard;
 393         u_int16_t entry_head_size, entry_return_size;
 394
 395         last = g_list_last(table->entries);
 396
 397         /*
 398          * An empty chain is composed of:
 399          * - A head entry, with no match and an error target.
 400          *   The error target data is the chain name.
 401          * - A tail entry, with no match and a standard target.
 402          *   The standard target verdict is XT_RETURN (return to the
 403          *   caller).
 404          */
 405
 406         /* head entry */
 407         entry_head_size = sizeof(struct ipt_entry) +
 408                                 sizeof(struct ipt_error_target);
 409         entry_head = g_try_malloc0(entry_head_size);
 410         if (entry_head == NULL)
 411                 goto err;
 412
 413         memset(entry_head, 0, entry_head_size);
 414
 415         entry_head->target_offset = sizeof(struct ipt_entry);
 416         entry_head->next_offset = entry_head_size;
 417
 418         error = (struct ipt_error_target *) entry_head->elems;
 419         strcpy(error->t.u.user.name, IPT_ERROR_TARGET);
 420         error->t.u.user.target_size = ALIGN(sizeof(struct ipt_error_target));
 421         strcpy(error->error, name);
 422
 423         if (connman_add_entry(table, entry_head, last, -1) < 0)
 424                 goto err;
 425
 426         /* tail entry */
 427         entry_return_size = sizeof(struct ipt_entry) +
 428                                 sizeof(struct ipt_standard_target);
 429         entry_return = g_try_malloc0(entry_return_size);
 430         if (entry_return == NULL)
 431                 goto err;
 432
 433         memset(entry_return, 0, entry_return_size);
 434
 435         entry_return->target_offset = sizeof(struct ipt_entry);
 436         entry_return->next_offset = entry_return_size;
 437
 438         standard = (struct ipt_standard_target *) entry_return->elems;
 439         standard->target.u.user.target_size =
 440                                 ALIGN(sizeof(struct ipt_standard_target));
 441         standard->verdict = XT_RETURN;
 442
 443         if (connman_add_entry(table, entry_return, last, -1) < 0)
 444                 goto err;
 445
 446         return 0;
 447
 448 err:
 449         g_free(entry_head);
 450         g_free(entry_return);
 451
 452         return -ENOMEM;
 453 }
 454
 455 static struct ipt_entry *
 456 new_rule(struct connman_iptables *table,
 457                 char *target_name, struct xtables_target *xt_t,
 458                 char *match_name, struct xtables_match *xt_m)
 459 {
 460         struct ipt_entry *new_entry;
 461         size_t match_size, target_size;
 462         int is_builtin = is_builtin_target(target_name);
 463
 464         if (xt_m)
 465                 match_size = xt_m->m->u.match_size;
 466         else
 467                 match_size = 0;
 468
 469         if (xt_t)
 470                 target_size = ALIGN(xt_t->t->u.target_size);
 471         else
 472                 target_size = ALIGN(sizeof(struct xt_standard_target));
 473
 474         new_entry = g_try_malloc0(sizeof(struct ipt_entry) + target_size +
 475                                                                 match_size);
 476         if (new_entry == NULL)
 477                 return NULL;
 478
 479         new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 480         new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 481                                                                 match_size;
 482         if (xt_m) {
 483                 struct xt_entry_match *entry_match;
 484
 485                 entry_match = (struct xt_entry_match *)new_entry->elems;
 486                 memcpy(entry_match, xt_m->m, match_size);
 487         }
 488
 489         if (xt_t) {
 490                 struct xt_entry_target *entry_target;
 491
 492                 if (is_builtin) {
 493                         struct xt_standard_target *target;
 494
 495                         target = (struct xt_standard_target *)(xt_t->t);
 496                         strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 497                         target->verdict = target_to_verdict(target_name);
 498                 }
 499
 500                 entry_target = ipt_get_target(new_entry);
 501                 memcpy(entry_target, xt_t->t, target_size);
 502         } else {
 503                 struct connman_iptables_entry *target_rule;
 504                 struct xt_standard_target *target;
 505                 GList *chain_head;
 506
 507                 /*
 508                  * This is a user defined target, i.e. a chain jump.
 509                  * We search for the chain head, and the target verdict
 510                  * is the first rule's offset on this chain.
 511                  * The offset is from the beginning of the table.
 512                  */
 513
 514                 chain_head = find_chain_head(table, target_name);
 515                 if (chain_head == NULL || chain_head->next == NULL) {
 516                         g_free(new_entry);
 517                         return NULL;
 518                 }
 519
 520                 target_rule = chain_head->next->data;
 521
 522                 target = (struct xt_standard_target *)ipt_get_target(new_entry);
 523                 strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
 524                 target->target.u.user.target_size = target_size;
 525                 target->verdict = target_rule->offset;
 526         }
 527
 528         return new_entry;
 529 }
 530
 531 static void update_hooks(struct connman_iptables *table, GList *chain_head, struct ipt_entry *entry)
 532 {
 533         GList *list;
 534         struct connman_iptables_entry *head, *e;
 535         int builtin;
 536
 537         if (chain_head == NULL)
 538                 return;
 539
 540         head = chain_head->data;
 541
 542         builtin = head->builtin;
 543         if (builtin < 0)
 544                 return;
 545
 546         table->underflow[builtin] += entry->next_offset;
 547
 548         for (list = chain_head->next; list; list = list->next) {
 549                 e = list->data;
 550
 551                 builtin = e->builtin;
 552                 if (builtin < 0)
 553                         continue;
 554
 555                 table->hook_entry[builtin] += entry->next_offset;
 556         }
 557 }
 558
 559 static int
 560 connman_iptables_add_rule(struct connman_iptables *table, char *chain_name,
 561                                 char *target_name, struct xtables_target *xt_t,
 562                                 char *match_name, struct xtables_match *xt_m)
 563 {
 564         GList *chain_tail, *chain_head;
 565         struct ipt_entry *new_entry;
 566
 567         chain_head = find_chain_head(table, chain_name);
 568         if (chain_head == NULL)
 569                 return -EINVAL;
 570
 571         chain_tail = find_chain_tail(table, chain_name);
 572         if (chain_tail == NULL)
 573                 return -EINVAL;
 574
 575         new_entry = new_rule(table,
 576                                 target_name, xt_t,
 577                                 match_name, xt_m);
 578         if (new_entry == NULL)
 579                 return -EINVAL;
 580
 581         update_hooks(table, chain_head, new_entry);
 582
 583         return connman_add_entry(table, new_entry, chain_tail, -1);
 584 }
 585
 586 static struct ipt_replace *
 587 connman_iptables_blob(struct connman_iptables *table)
 588 {
 589         struct ipt_replace *r;
 590         GList *list;
 591         struct connman_iptables_entry *e;
 592         unsigned char *entry_index;
 593
 594         r = g_try_malloc0(sizeof(struct ipt_replace) + table->size);
 595         if (r == NULL)
 596                 return NULL;
 597
 598         memset(r, 0, sizeof(*r) + table->size);
 599
 600         r->counters = g_try_malloc0(sizeof(struct xt_counters)
 601                                 * table->num_entries);
 602         if (r->counters == NULL) {
 603                 g_free(r);
 604                 return NULL;
 605         }
 606
 607         strcpy(r->name, table->info->name);
 608         r->num_entries = table->num_entries;
 609         r->size = table->size;
 610
 611         r->num_counters = table->old_entries;
 612         r->valid_hooks  = table->info->valid_hooks;
 613
 614         memcpy(r->hook_entry, table->hook_entry, sizeof(table->hook_entry));
 615         memcpy(r->underflow, table->underflow, sizeof(table->underflow));
 616
 617         entry_index = (unsigned char *)r->entries;
 618         for (list = table->entries; list; list = list->next) {
 619                 e = list->data;
 620
 621                 memcpy(entry_index, e->entry, e->entry->next_offset);
 622                 entry_index += e->entry->next_offset;
 623         }
 624
 625         return r;
 626 }
 627
 628 static void dump_target(struct connman_iptables *table,
 629                                 struct ipt_entry *entry)
 630
 631 {
 632         struct xtables_target *xt_t;
 633         struct xt_entry_target *target;
 634
 635         target = ipt_get_target(entry);
 636
 637         if (!strcmp(target->u.user.name, IPT_STANDARD_TARGET)) {
 638                 struct xt_standard_target *t;
 639
 640                 t = (struct xt_standard_target *)target;
 641
 642                 switch (t->verdict) {
 643                 case XT_RETURN:
 644                         printf("\ttarget RETURN\n");
 645                         break;
 646
 647                 case -NF_ACCEPT - 1:
 648                         printf("\ttarget ACCEPT\n");
 649                         break;
 650
 651                 case -NF_DROP - 1:
 652                         printf("\ttarget DROP\n");
 653                         break;
 654
 655                 case -NF_QUEUE - 1:
 656                         printf("\ttarget QUEUE\n");
 657                         break;
 658
 659                 case -NF_STOP - 1:
 660                         printf("\ttarget STOP\n");
 661                         break;
 662
 663                 default:
 664                         printf("\tJUMP @%p (0x%x)\n",
 665                                 (char*)table->blob_entries->entrytable +
 666                                 t->verdict, t->verdict);
 667                         break;
 668                 }
 669
 670                 xt_t = xtables_find_target(IPT_STANDARD_TARGET,
 671                                                 XTF_LOAD_MUST_SUCCEED);
 672
 673                 if(xt_t->print != NULL)
 674                         xt_t->print(NULL, target, 1);
 675         } else {
 676                 xt_t = xtables_find_target(target->u.user.name, XTF_TRY_LOAD);
 677                 if (xt_t == NULL) {
 678                         printf("\ttarget %s\n", target->u.user.name);
 679                         return;
 680                 }
 681
 682                 if(xt_t->print != NULL) {
 683                         printf("\ttarget ");
 684                         xt_t->print(NULL, target, 1);
 685                         printf("\n");
 686                 }
 687         }
 688 }
 689
 690 static void dump_match(struct connman_iptables *table, struct ipt_entry *entry)
 691 {
 692         struct xtables_match *xt_m;
 693         struct xt_entry_match *match;
 694
 695         if (entry->elems == (unsigned char *)entry + entry->target_offset)
 696                 return;
 697
 698         match = (struct xt_entry_match *) entry->elems;
 699
 700         if (!strlen(match->u.user.name))
 701                 return;
 702
 703         xt_m = xtables_find_match(match->u.user.name, XTF_TRY_LOAD, NULL);
 704         if (xt_m == NULL)
 705                 goto out;
 706
 707         if(xt_m->print != NULL) {
 708                 printf("\tmatch ");
 709                 xt_m->print(NULL, match, 1);
 710                 printf("\n");
 711
 712                 return;
 713         }
 714
 715 out:
 716         printf("\tmatch %s\n", match->u.user.name);
 717
 718 }
 719
 720 static int connman_iptables_dump_entry(struct ipt_entry *entry,
 721                                         struct connman_iptables *table)
 722 {
 723         struct xt_entry_target *target;
 724         unsigned int offset;
 725         int builtin;
 726
 727         offset = (char *)entry - (char *)table->blob_entries->entrytable;
 728         target = ipt_get_target(entry);
 729         builtin = is_hook_entry(table, entry);
 730
 731         if (entry_to_offset(table, entry) + entry->next_offset ==
 732                                         table->blob_entries->size) {
 733                 printf("End of CHAIN 0x%x\n", offset);
 734                 return 0;
 735         }
 736
 737         if (!strcmp(target->u.user.name, IPT_ERROR_TARGET)) {
 738                 printf("USER CHAIN (%s) %p  match %p  target %p  size %d\n",
 739                         target->data, entry, entry->elems,
 740                         (char *)entry + entry->target_offset,
 741                                 entry->next_offset);
 742
 743                 return 0;
 744         } else if (builtin >= 0) {
 745                 printf("CHAIN (%s) %p  match %p  target %p  size %d\n",
 746                         hooknames[builtin], entry, entry->elems,
 747                         (char *)entry + entry->target_offset,
 748                                 entry->next_offset);
 749         } else {
 750                 printf("RULE %p  match %p  target %p  size %d\n", entry,
 751                         entry->elems,
 752                         (char *)entry + entry->target_offset,
 753                                 entry->next_offset);
 754         }
 755
 756         dump_match(table, entry);
 757         dump_target(table, entry);
 758
 759         return 0;
 760 }
 761
 762 static void connman_iptables_dump_hook(struct connman_iptables *table)
 763 {
 764         int i;
 765         printf("hooks: \n");
 766         for (i = 0; i < NF_INET_NUMHOOKS; i++) {
 767                 if ((table->info->valid_hooks & (1 << i)))
 768                         printf("%s entry 0x%x underflow 0x%x (0x%x)\n",
 769                                 hooknames[i],
 770                                 (unsigned int)table->blob_entries->entrytable +
 771                                                 table->info->hook_entry[i],
 772                                 (unsigned int)table->blob_entries->entrytable +
 773                                                 table->info->underflow[i],
 774                                         table->info->underflow[i]);
 775         }
 776 }
 777
 778 static void connman_iptables_dump(struct connman_iptables *table)
 779 {
 780         printf("%s valid_hooks=0x%08x, num_entries=%u, size=%u\n",
 781                 table->info->name,
 782                 table->info->valid_hooks, table->info->num_entries,
 783                 table->info->size);
 784
 785         connman_iptables_dump_hook(table);
 786
 787         ENTRY_ITERATE(table->blob_entries->entrytable,
 788                         table->blob_entries->size,
 789                         connman_iptables_dump_entry, table);
 790
 791 }
 792
 793 static int connman_iptables_get_entries(struct connman_iptables *table)
 794 {
 795         socklen_t entry_size;
 796
 797         entry_size = sizeof(struct ipt_get_entries) + table->info->size;
 798
 799         return getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_ENTRIES,
 800                                 table->blob_entries, &entry_size);
 801 }
 802
 803 static int connman_iptables_replace(struct connman_iptables *table,
 804                                         struct ipt_replace *r)
 805 {
 806         return setsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_SET_REPLACE, r,
 807                          sizeof(*r) + r->size);
 808 }
 809
 810 static void connman_iptables_cleanup(struct connman_iptables *table)
 811 {
 812         GList *list;
 813         struct connman_iptables_entry *entry;
 814
 815         close(table->ipt_sock);
 816
 817         for (list = table->entries; list; list = list->next) {
 818                 entry = list->data;
 819
 820                 g_free(entry->entry);
 821         }
 822
 823         g_free(table->info);
 824         g_free(table->blob_entries);
 825         g_free(table);
 826
 827         xtables_free_opts(1);
 828 }
 829
 830 static int connman_iptables_commit(struct connman_iptables *table)
 831 {
 832         struct ipt_replace *repl;
 833
 834         repl = connman_iptables_blob(table);
 835
 836         return connman_iptables_replace(table, repl);
 837 }
 838
 839 static int add_entry(struct ipt_entry *entry, struct connman_iptables *table)
 840 {
 841         struct ipt_entry *new_entry;
 842         int builtin;
 843
 844         new_entry = g_try_malloc0(entry->next_offset);
 845         if (new_entry == NULL)
 846                 return -ENOMEM;
 847
 848         memcpy(new_entry, entry, entry->next_offset);
 849
 850         builtin = is_hook_entry(table, entry);
 851
 852         return connman_add_entry(table, new_entry, NULL, builtin);
 853 }
 854
 855 static struct connman_iptables *connman_iptables_init(const char *table_name)
 856 {
 857         struct connman_iptables *table;
 858         socklen_t s;
 859
 860         table =  g_try_new0(struct connman_iptables, 1);
 861         if (table == NULL)
 862                 return NULL;
 863
 864         table->info =  g_try_new0(struct ipt_getinfo, 1);
 865         if (table->info == NULL)
 866                 goto err;
 867
 868         table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 869         if (table->ipt_sock < 0)
 870                 goto err;
 871
 872         s = sizeof(*table->info);
 873         strcpy(table->info->name, table_name);
 874         if (getsockopt(table->ipt_sock, IPPROTO_IP, IPT_SO_GET_INFO,
 875                                                 table->info, &s) < 0)
 876                 goto err;
 877
 878         table->blob_entries = g_try_malloc0(sizeof(struct ipt_get_entries) +
 879                                                 table->info->size);
 880         if (table->blob_entries == NULL)
 881                 goto err;
 882
 883         strcpy(table->blob_entries->name, table_name);
 884         table->blob_entries->size = table->info->size;
 885
 886         if (connman_iptables_get_entries(table) < 0)
 887                 goto err;
 888
 889         table->num_entries = 0;
 890         table->old_entries = table->info->num_entries;
 891         table->size = 0;
 892
 893         memcpy(table->underflow, table->info->underflow,
 894                                 sizeof(table->info->underflow));
 895         memcpy(table->hook_entry, table->info->hook_entry,
 896                                 sizeof(table->info->hook_entry));
 897
 898         ENTRY_ITERATE(table->blob_entries->entrytable,
 899                         table->blob_entries->size,
 900                                 add_entry, table);
 901
 902
 903         return table;
 904
 905 err:
 906
 907         connman_iptables_cleanup(table);
 908
 909         return NULL;
 910 }
 911
 912
 913 static struct option connman_iptables_opts[] = {
 914         {.name = "append",        .has_arg = 1, .val = 'A'},
 915         {.name = "list",          .has_arg = 2, .val = 'L'},
 916         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 917         {.name = "delete-chain",  .has_arg = 1, .val = 'X'},
 918         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 919         {.name = "jump",          .has_arg = 1, .val = 'j'},
 920         {.name = "match",         .has_arg = 1, .val = 'm'},
 921         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 922         {.name = "table",         .has_arg = 1, .val = 't'},
 923         {NULL},
 924 };
 925
 926 struct xtables_globals connman_iptables_globals = {
 927         .option_offset = 0,
 928         .opts = connman_iptables_opts,
 929         .orig_opts = connman_iptables_opts,
 930 };
 931
 932 int main(int argc, char *argv[])
 933 {
 934         struct connman_iptables *table;
 935         struct xtables_match *xt_m;
 936         struct xtables_target *xt_t;
 937         char *table_name, *chain, *new_chain, *match_name, *target_name;
 938         char *delete_chain;
 939         int c;
 940         size_t size;
 941         gboolean dump, invert, delete;
 942
 943         xtables_init_all(&connman_iptables_globals, NFPROTO_IPV4);
 944
 945         dump = FALSE;
 946         invert = FALSE;
 947         delete = FALSE;
 948         table_name = chain = new_chain = match_name = target_name = NULL;
 949         delete_chain = NULL;
 950         table = NULL;
 951         xt_m = NULL;
 952         xt_t = NULL;
 953
 954         while ((c = getopt_long(argc, argv,
 955            "-A:L::N:X:j:i:m:o:t:", connman_iptables_globals.opts, NULL)) != -1) {
 956                 switch (c) {
 957                 case 'A':
 958                         chain = optarg;
 959                         break;
 960
 961                 case 'L':
 962                         dump = true;
 963                         break;
 964
 965                 case 'N':
 966                         new_chain = optarg;
 967                         break;
 968
 969                 case 'X':
 970                         delete = true;
 971                         delete_chain = optarg;
 972                         break;
 973
 974                 case 'j':
 975                         target_name = optarg;
 976                         xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
 977
 978                         if (xt_t == NULL)
 979                                 break;
 980
 981                         size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
 982
 983                         xt_t->t = g_try_malloc0(size);
 984                         if (xt_t->t == NULL)
 985                                 goto out;
 986                         xt_t->t->u.target_size = size;
 987                         strcpy(xt_t->t->u.user.name, target_name);
 988                         xt_t->t->u.user.revision = xt_t->revision;
 989                         if (xt_t->init != NULL)
 990                                 xt_t->init(xt_t->t);
 991                         connman_iptables_globals.opts =
 992                                 xtables_merge_options(connman_iptables_globals.opts,
 993                                                      xt_t->extra_opts,
 994                                                      &xt_t->option_offset);
 995                         if (connman_iptables_globals.opts == NULL)
 996                                 goto out;
 997
 998                         break;
 999
1000                 case 'i':
1001                         break;
1002
1003                 case 'm':
1004                         match_name = optarg;
1005
1006                         xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
1007                         size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
1008                         xt_m->m = g_try_malloc0(size);
1009                         if (xt_m == NULL)
1010                                 goto out;
1011                         xt_m->m->u.match_size = size;
1012                         strcpy(xt_m->m->u.user.name, xt_m->name);
1013                         xt_m->m->u.user.revision = xt_m->revision;
1014                         if (xt_m->init != NULL)
1015                                 xt_m->init(xt_m->m);
1016                         if (xt_m != xt_m->next) {
1017                                 connman_iptables_globals.opts =
1018                                         xtables_merge_options(connman_iptables_globals.opts,
1019                                                 xt_m->extra_opts,
1020                                                 &xt_m->option_offset);
1021                                 if (connman_iptables_globals.opts == NULL)
1022                                         goto out;
1023                         }
1024
1025                         break;
1026
1027                 case 'o':
1028                         break;
1029
1030                 case 't':
1031                         table_name = optarg;
1032                         break;
1033
1034                 case 1:
1035                         if (optarg[0] == '!' && optarg[1] == '\0') {
1036                                 if (invert)
1037                                         printf("Consecutive ! not allowed\n");
1038
1039                                 invert = TRUE;
1040                                 optarg[0] = '\0';
1041                                 continue;
1042                         }
1043
1044                         printf("Invalid option\n");
1045
1046                         return -1;
1047
1048                 default:
1049                         if (xt_t == NULL || xt_t->parse == NULL ||
1050                             !xt_t->parse(c - xt_t->option_offset, argv, invert,
1051                                         &xt_t->tflags, NULL, &xt_t->t)) {
1052                                 if (xt_m == NULL || xt_m->parse == NULL)
1053                                         break;
1054
1055                                 xt_m->parse(c - xt_m->option_offset, argv,
1056                                         invert, &xt_m->mflags, NULL, &xt_m->m);
1057                         }
1058
1059                         break;
1060                 }
1061         }
1062
1063         if (table_name == NULL)
1064                 table_name = "filter";
1065
1066         table = connman_iptables_init(table_name);
1067         if (table == NULL)
1068                 return -1;
1069
1070         if (delete) {
1071                 if (delete_chain == NULL)
1072                         goto out;
1073
1074                 printf("Delete chain %s\n", delete_chain);
1075
1076                 connman_iptables_delete_chain(table, delete_chain);
1077
1078                 goto commit;
1079         }
1080
1081         if (dump) {
1082                 connman_iptables_dump(table);
1083
1084                 return 0;
1085         }
1086
1087         if (chain && new_chain)
1088                 return -1;
1089
1090         if (new_chain) {
1091                 printf("New chain %s\n", new_chain);
1092
1093                 connman_iptables_add_chain(table, new_chain);
1094
1095                 goto commit;
1096         }
1097
1098         if (chain) {
1099                 if (target_name == NULL)
1100                         return -1;
1101
1102                 printf("Adding %s to %s (match %s)\n", target_name, chain, match_name);
1103
1104                 connman_iptables_add_rule(table, chain, target_name, xt_t,
1105                                         match_name, xt_m);
1106
1107                 goto commit;
1108         }
1109
1110 commit:
1111
1112         connman_iptables_commit(table);
1113
1114 out:
1115         connman_iptables_cleanup(table);
1116
1117         if (xt_t)
1118                 g_free(xt_t->t);
1119
1120         if (xt_m)
1121                 g_free(xt_m->m);
1122
1123         return 0;
1124 }