iptables.c

   1 /* Code to take an iptables-style command line and do it. */
   2
   3 /*
   4  * Author: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au
   5  *
   6  * (C) 2000-2002 by the netfilter coreteam <coreteam@netfilter.org>:
   7  *                  Paul 'Rusty' Russell <rusty@rustcorp.com.au>
   8  *                  Marc Boucher <marc+nf@mbsi.ca>
   9  *                  James Morris <jmorris@intercode.com.au>
  10  *                  Harald Welte <laforge@gnumonks.org>
  11  *                  Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
  12  *
  13  *      This program is free software; you can redistribute it and/or modify
  14  *      it under the terms of the GNU General Public License as published by
  15  *      the Free Software Foundation; either version 2 of the License, or
  16  *      (at your option) any later version.
  17  *
  18  *      This program is distributed in the hope that it will be useful,
  19  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *      GNU General Public License for more details.
  22  *
  23  *      You should have received a copy of the GNU General Public License
  24  *      along with this program; if not, write to the Free Software
  25  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <getopt.h>
  29 #include <string.h>
  30 #include <netdb.h>
  31 #include <errno.h>
  32 #include <stdbool.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <ctype.h>
  36 #include <stdarg.h>
  37 #include <limits.h>
  38 #include <unistd.h>
  39 #include <iptables.h>
  40 #include <xtables.h>
  41 #include <fcntl.h>
  42 #include <sys/utsname.h>
  43 #include "xshared.h"
  44
  45 #ifndef TRUE
  46 #define TRUE 1
  47 #endif
  48 #ifndef FALSE
  49 #define FALSE 0
  50 #endif
  51
  52 #define FMT_NUMERIC     0x0001
  53 #define FMT_NOCOUNTS    0x0002
  54 #define FMT_KILOMEGAGIGA 0x0004
  55 #define FMT_OPTIONS     0x0008
  56 #define FMT_NOTABLE     0x0010
  57 #define FMT_NOTARGET    0x0020
  58 #define FMT_VIA         0x0040
  59 #define FMT_NONEWLINE   0x0080
  60 #define FMT_LINENUMBERS 0x0100
  61
  62 #define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \
  63                         | FMT_NUMERIC | FMT_NOTABLE)
  64 #define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (tab))
  65
  66
  67 #define CMD_NONE                0x0000U
  68 #define CMD_INSERT              0x0001U
  69 #define CMD_DELETE              0x0002U
  70 #define CMD_DELETE_NUM          0x0004U
  71 #define CMD_REPLACE             0x0008U
  72 #define CMD_APPEND              0x0010U
  73 #define CMD_LIST                0x0020U
  74 #define CMD_FLUSH               0x0040U
  75 #define CMD_ZERO                0x0080U
  76 #define CMD_NEW_CHAIN           0x0100U
  77 #define CMD_DELETE_CHAIN        0x0200U
  78 #define CMD_SET_POLICY          0x0400U
  79 #define CMD_RENAME_CHAIN        0x0800U
  80 #define CMD_LIST_RULES          0x1000U
  81 #define CMD_ZERO_NUM            0x2000U
  82 #define NUMBER_OF_CMD   15
  83 static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z',
  84                                  'Z', 'N', 'X', 'P', 'E', 'S' };
  85
  86 #define OPT_NONE        0x00000U
  87 #define OPT_NUMERIC     0x00001U
  88 #define OPT_SOURCE      0x00002U
  89 #define OPT_DESTINATION 0x00004U
  90 #define OPT_PROTOCOL    0x00008U
  91 #define OPT_JUMP        0x00010U
  92 #define OPT_VERBOSE     0x00020U
  93 #define OPT_EXPANDED    0x00040U
  94 #define OPT_VIANAMEIN   0x00080U
  95 #define OPT_VIANAMEOUT  0x00100U
  96 #define OPT_FRAGMENT    0x00200U
  97 #define OPT_LINENUMBERS 0x00400U
  98 #define OPT_COUNTERS    0x00800U
  99 #define NUMBER_OF_OPT   12
 100 static const char optflags[NUMBER_OF_OPT]
 101 = { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', 'f', '0', 'c'};
 102
 103 static struct option original_opts[] = {
 104         {.name = "append",        .has_arg = 1, .val = 'A'},
 105         {.name = "delete",        .has_arg = 1, .val = 'D'},
 106         {.name = "insert",        .has_arg = 1, .val = 'I'},
 107         {.name = "replace",       .has_arg = 1, .val = 'R'},
 108         {.name = "list",          .has_arg = 2, .val = 'L'},
 109         {.name = "list-rules",    .has_arg = 2, .val = 'S'},
 110         {.name = "flush",         .has_arg = 2, .val = 'F'},
 111         {.name = "zero",          .has_arg = 2, .val = 'Z'},
 112         {.name = "new-chain",     .has_arg = 1, .val = 'N'},
 113         {.name = "delete-chain",  .has_arg = 2, .val = 'X'},
 114         {.name = "rename-chain",  .has_arg = 1, .val = 'E'},
 115         {.name = "policy",        .has_arg = 1, .val = 'P'},
 116         {.name = "source",        .has_arg = 1, .val = 's'},
 117         {.name = "destination",   .has_arg = 1, .val = 'd'},
 118         {.name = "src",           .has_arg = 1, .val = 's'}, /* synonym */
 119         {.name = "dst",           .has_arg = 1, .val = 'd'}, /* synonym */
 120         {.name = "protocol",      .has_arg = 1, .val = 'p'},
 121         {.name = "in-interface",  .has_arg = 1, .val = 'i'},
 122         {.name = "jump",          .has_arg = 1, .val = 'j'},
 123         {.name = "table",         .has_arg = 1, .val = 't'},
 124         {.name = "match",         .has_arg = 1, .val = 'm'},
 125         {.name = "numeric",       .has_arg = 0, .val = 'n'},
 126         {.name = "out-interface", .has_arg = 1, .val = 'o'},
 127         {.name = "verbose",       .has_arg = 0, .val = 'v'},
 128         {.name = "exact",         .has_arg = 0, .val = 'x'},
 129         {.name = "fragments",     .has_arg = 0, .val = 'f'},
 130         {.name = "version",       .has_arg = 0, .val = 'V'},
 131         {.name = "help",          .has_arg = 2, .val = 'h'},
 132         {.name = "line-numbers",  .has_arg = 0, .val = '0'},
 133         {.name = "modprobe",      .has_arg = 1, .val = 'M'},
 134         {.name = "set-counters",  .has_arg = 1, .val = 'c'},
 135         {.name = "goto",          .has_arg = 1, .val = 'g'},
 136         {NULL},
 137 };
 138
 139 /* we need this for iptables-restore.  iptables-restore.c sets line to the
 140  * current line of the input file, in order  to give a more precise error
 141  * message.  iptables itself doesn't need this, so it is initialized to the
 142  * magic number of -1 */
 143 int line = -1;
 144
 145 void iptables_exit_error(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3)));
 146
 147 struct xtables_globals iptables_globals = {
 148         .option_offset = 0,
 149         .program_version = IPTABLES_VERSION,
 150         .opts = original_opts,
 151         .orig_opts = original_opts,
 152         .exit_err = iptables_exit_error,
 153 };
 154
 155 /* Table of legal combinations of commands and options.  If any of the
 156  * given commands make an option legal, that option is legal (applies to
 157  * CMD_LIST and CMD_ZERO only).
 158  * Key:
 159  *  +  compulsory
 160  *  x  illegal
 161  *     optional
 162  */
 163
 164 static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
 165 /* Well, it's better than "Re: Linux vs FreeBSD" */
 166 {
 167         /*     -n  -s  -d  -p  -j  -v  -x  -i  -o  -f --line -c */
 168 /*INSERT*/    {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '},
 169 /*DELETE*/    {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x','x'},
 170 /*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x','x'},
 171 /*REPLACE*/   {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '},
 172 /*APPEND*/    {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '},
 173 /*LIST*/      {' ','x','x','x','x',' ',' ','x','x','x',' ','x'},
 174 /*FLUSH*/     {'x','x','x','x','x',' ','x','x','x','x','x','x'},
 175 /*ZERO*/      {'x','x','x','x','x',' ','x','x','x','x','x','x'},
 176 /*ZERO_NUM*/  {'x','x','x','x','x',' ','x','x','x','x','x','x'},
 177 /*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
 178 /*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
 179 /*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x','x',' '},
 180 /*RENAME*/    {'x','x','x','x','x',' ','x','x','x','x','x','x'},
 181 /*LIST_RULES*/{'x','x','x','x','x',' ','x','x','x','x','x','x'}
 182 };
 183
 184 static int inverse_for_options[NUMBER_OF_OPT] =
 185 {
 186 /* -n */ 0,
 187 /* -s */ IPT_INV_SRCIP,
 188 /* -d */ IPT_INV_DSTIP,
 189 /* -p */ IPT_INV_PROTO,
 190 /* -j */ 0,
 191 /* -v */ 0,
 192 /* -x */ 0,
 193 /* -i */ IPT_INV_VIA_IN,
 194 /* -o */ IPT_INV_VIA_OUT,
 195 /* -f */ IPT_INV_FRAG,
 196 /*--line*/ 0,
 197 /* -c */ 0,
 198 };
 199
 200 #define opts iptables_globals.opts
 201 #define prog_name iptables_globals.program_name
 202 #define prog_vers iptables_globals.program_version
 203
 204 int kernel_version;
 205
 206 /* Primitive headers... */
 207 /* defined in netinet/in.h */
 208 #if 0
 209 #ifndef IPPROTO_ESP
 210 #define IPPROTO_ESP 50
 211 #endif
 212 #ifndef IPPROTO_AH
 213 #define IPPROTO_AH 51
 214 #endif
 215 #endif
 216
 217 static const char *
 218 proto_to_name(u_int8_t proto, int nolookup)
 219 {
 220         unsigned int i;
 221
 222         if (proto && !nolookup) {
 223                 struct protoent *pent = getprotobynumber(proto);
 224                 if (pent)
 225                         return pent->p_name;
 226         }
 227
 228         for (i = 0; xtables_chain_protos[i].name != NULL; ++i)
 229                 if (xtables_chain_protos[i].num == proto)
 230                         return xtables_chain_protos[i].name;
 231
 232         return NULL;
 233 }
 234
 235 enum {
 236         IPT_DOTTED_ADDR = 0,
 237         IPT_DOTTED_MASK
 238 };
 239
 240 static void __attribute__((noreturn))
 241 exit_tryhelp(int status)
 242 {
 243         if (line != -1)
 244                 fprintf(stderr, "Error occurred at line: %d\n", line);
 245         fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
 246                         prog_name, prog_name);
 247         xtables_free_opts(1);
 248         exit(status);
 249 }
 250
 251 static void
 252 exit_printhelp(struct xtables_rule_match *matches)
 253 {
 254         printf("%s v%s\n\n"
 255 "Usage: %s -[AD] chain rule-specification [options]\n"
 256 "       %s -I chain [rulenum] rule-specification [options]\n"
 257 "       %s -R chain rulenum rule-specification [options]\n"
 258 "       %s -D chain rulenum [options]\n"
 259 "       %s -[LS] [chain [rulenum]] [options]\n"
 260 "       %s -[FZ] [chain] [options]\n"
 261 "       %s -[NX] chain\n"
 262 "       %s -E old-chain-name new-chain-name\n"
 263 "       %s -P chain target [options]\n"
 264 "       %s -h (print this help information)\n\n",
 265                prog_name, prog_vers, prog_name, prog_name,
 266                prog_name, prog_name, prog_name, prog_name,
 267                prog_name, prog_name, prog_name, prog_name);
 268
 269         printf(
 270 "Commands:\n"
 271 "Either long or short options are allowed.\n"
 272 "  --append  -A chain           Append to chain\n"
 273 "  --delete  -D chain           Delete matching rule from chain\n"
 274 "  --delete  -D chain rulenum\n"
 275 "                               Delete rule rulenum (1 = first) from chain\n"
 276 "  --insert  -I chain [rulenum]\n"
 277 "                               Insert in chain as rulenum (default 1=first)\n"
 278 "  --replace -R chain rulenum\n"
 279 "                               Replace rule rulenum (1 = first) in chain\n"
 280 "  --list    -L [chain [rulenum]]\n"
 281 "                               List the rules in a chain or all chains\n"
 282 "  --list-rules -S [chain [rulenum]]\n"
 283 "                               Print the rules in a chain or all chains\n"
 284 "  --flush   -F [chain]         Delete all rules in  chain or all chains\n"
 285 "  --zero    -Z [chain [rulenum]]\n"
 286 "                               Zero counters in chain or all chains\n"
 287 "  --new     -N chain           Create a new user-defined chain\n"
 288 "  --delete-chain\n"
 289 "            -X [chain]         Delete a user-defined chain\n"
 290 "  --policy  -P chain target\n"
 291 "                               Change policy on chain to target\n"
 292 "  --rename-chain\n"
 293 "            -E old-chain new-chain\n"
 294 "                               Change chain name, (moving any references)\n"
 295
 296 "Options:\n"
 297 "[!] --proto    -p proto        protocol: by number or name, eg. `tcp'\n"
 298 "[!] --source   -s address[/mask][...]\n"
 299 "                               source specification\n"
 300 "[!] --destination -d address[/mask][...]\n"
 301 "                               destination specification\n"
 302 "[!] --in-interface -i input name[+]\n"
 303 "                               network interface name ([+] for wildcard)\n"
 304 " --jump        -j target\n"
 305 "                               target for rule (may load target extension)\n"
 306 #ifdef IPT_F_GOTO
 307 "  --goto      -g chain\n"
 308 "                              jump to chain with no return\n"
 309 #endif
 310 "  --match      -m match\n"
 311 "                               extended match (may load extension)\n"
 312 "  --numeric    -n              numeric output of addresses and ports\n"
 313 "[!] --out-interface -o output name[+]\n"
 314 "                               network interface name ([+] for wildcard)\n"
 315 "  --table      -t table        table to manipulate (default: `filter')\n"
 316 "  --verbose    -v              verbose mode\n"
 317 "  --line-numbers               print line numbers when listing\n"
 318 "  --exact      -x              expand numbers (display exact values)\n"
 319 "[!] --fragment -f              match second or further fragments only\n"
 320 "  --modprobe=<command>         try to insert modules using this command\n"
 321 "  --set-counters PKTS BYTES    set the counter during insert/append\n"
 322 "[!] --version  -V              print package version.\n");
 323
 324         print_extension_helps(xtables_targets, matches);
 325         exit(0);
 326 }
 327
 328 void
 329 iptables_exit_error(enum xtables_exittype status, const char *msg, ...)
 330 {
 331         va_list args;
 332
 333         va_start(args, msg);
 334         fprintf(stderr, "%s v%s: ", prog_name, prog_vers);
 335         vfprintf(stderr, msg, args);
 336         va_end(args);
 337         fprintf(stderr, "\n");
 338         if (status == PARAMETER_PROBLEM)
 339                 exit_tryhelp(status);
 340         if (status == VERSION_PROBLEM)
 341                 fprintf(stderr,
 342                         "Perhaps iptables or your kernel needs to be upgraded.\n");
 343         /* On error paths, make sure that we don't leak memory */
 344         xtables_free_opts(1);
 345         exit(status);
 346 }
 347
 348 static void
 349 generic_opt_check(int command, int options)
 350 {
 351         int i, j, legal = 0;
 352
 353         /* Check that commands are valid with options.  Complicated by the
 354          * fact that if an option is legal with *any* command given, it is
 355          * legal overall (ie. -z and -l).
 356          */
 357         for (i = 0; i < NUMBER_OF_OPT; i++) {
 358                 legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */
 359
 360                 for (j = 0; j < NUMBER_OF_CMD; j++) {
 361                         if (!(command & (1<<j)))
 362                                 continue;
 363
 364                         if (!(options & (1<<i))) {
 365                                 if (commands_v_options[j][i] == '+')
 366                                         xtables_error(PARAMETER_PROBLEM,
 367                                                    "You need to supply the `-%c' "
 368                                                    "option for this command\n",
 369                                                    optflags[i]);
 370                         } else {
 371                                 if (commands_v_options[j][i] != 'x')
 372                                         legal = 1;
 373                                 else if (legal == 0)
 374                                         legal = -1;
 375                         }
 376                 }
 377                 if (legal == -1)
 378                         xtables_error(PARAMETER_PROBLEM,
 379                                    "Illegal option `-%c' with this command\n",
 380                                    optflags[i]);
 381         }
 382 }
 383
 384 static char
 385 opt2char(int option)
 386 {
 387         const char *ptr;
 388         for (ptr = optflags; option > 1; option >>= 1, ptr++);
 389
 390         return *ptr;
 391 }
 392
 393 static char
 394 cmd2char(int option)
 395 {
 396         const char *ptr;
 397         for (ptr = cmdflags; option > 1; option >>= 1, ptr++);
 398
 399         return *ptr;
 400 }
 401
 402 static void
 403 add_command(unsigned int *cmd, const int newcmd, const int othercmds,
 404             int invert)
 405 {
 406         if (invert)
 407                 xtables_error(PARAMETER_PROBLEM, "unexpected ! flag");
 408         if (*cmd & (~othercmds))
 409                 xtables_error(PARAMETER_PROBLEM, "Cannot use -%c with -%c\n",
 410                            cmd2char(newcmd), cmd2char(*cmd & (~othercmds)));
 411         *cmd |= newcmd;
 412 }
 413
 414 /*
 415  *      All functions starting with "parse" should succeed, otherwise
 416  *      the program fails.
 417  *      Most routines return pointers to static data that may change
 418  *      between calls to the same or other routines with a few exceptions:
 419  *      "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask"
 420  *      return global static data.
 421 */
 422
 423 /* Christophe Burki wants `-p 6' to imply `-m tcp'.  */
 424 static struct xtables_match *
 425 find_proto(const char *pname, enum xtables_tryload tryload,
 426            int nolookup, struct xtables_rule_match **matches)
 427 {
 428         unsigned int proto;
 429
 430         if (xtables_strtoui(pname, NULL, &proto, 0, UINT8_MAX)) {
 431                 const char *protoname = proto_to_name(proto, nolookup);
 432
 433                 if (protoname)
 434                         return xtables_find_match(protoname, tryload, matches);
 435         } else
 436                 return xtables_find_match(pname, tryload, matches);
 437
 438         return NULL;
 439 }
 440
 441 /* Can't be zero. */
 442 static int
 443 parse_rulenumber(const char *rule)
 444 {
 445         unsigned int rulenum;
 446
 447         if (!xtables_strtoui(rule, NULL, &rulenum, 1, INT_MAX))
 448                 xtables_error(PARAMETER_PROBLEM,
 449                            "Invalid rule number `%s'", rule);
 450
 451         return rulenum;
 452 }
 453
 454 static const char *
 455 parse_target(const char *targetname)
 456 {
 457         const char *ptr;
 458
 459         if (strlen(targetname) < 1)
 460                 xtables_error(PARAMETER_PROBLEM,
 461                            "Invalid target name (too short)");
 462
 463         if (strlen(targetname) >= XT_EXTENSION_MAXNAMELEN)
 464                 xtables_error(PARAMETER_PROBLEM,
 465                            "Invalid target name `%s' (%u chars max)",
 466                            targetname, XT_EXTENSION_MAXNAMELEN - 1);
 467
 468         for (ptr = targetname; *ptr; ptr++)
 469                 if (isspace(*ptr))
 470                         xtables_error(PARAMETER_PROBLEM,
 471                                    "Invalid target name `%s'", targetname);
 472         return targetname;
 473 }
 474
 475 static void
 476 set_option(unsigned int *options, unsigned int option, u_int8_t *invflg,
 477            int invert)
 478 {
 479         if (*options & option)
 480                 xtables_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed",
 481                            opt2char(option));
 482         *options |= option;
 483
 484         if (invert) {
 485                 unsigned int i;
 486                 for (i = 0; 1 << i != option; i++);
 487
 488                 if (!inverse_for_options[i])
 489                         xtables_error(PARAMETER_PROBLEM,
 490                                    "cannot have ! before -%c",
 491                                    opt2char(option));
 492                 *invflg |= inverse_for_options[i];
 493         }
 494 }
 495
 496 static void
 497 print_num(u_int64_t number, unsigned int format)
 498 {
 499         if (format & FMT_KILOMEGAGIGA) {
 500                 if (number > 99999) {
 501                         number = (number + 500) / 1000;
 502                         if (number > 9999) {
 503                                 number = (number + 500) / 1000;
 504                                 if (number > 9999) {
 505                                         number = (number + 500) / 1000;
 506                                         if (number > 9999) {
 507                                                 number = (number + 500) / 1000;
 508                                                 printf(FMT("%4lluT ","%lluT "), (unsigned long long)number);
 509                                         }
 510                                         else printf(FMT("%4lluG ","%lluG "), (unsigned long long)number);
 511                                 }
 512                                 else printf(FMT("%4lluM ","%lluM "), (unsigned long long)number);
 513                         } else
 514                                 printf(FMT("%4lluK ","%lluK "), (unsigned long long)number);
 515                 } else
 516                         printf(FMT("%5llu ","%llu "), (unsigned long long)number);
 517         } else
 518                 printf(FMT("%8llu ","%llu "), (unsigned long long)number);
 519 }
 520
 521
 522 static void
 523 print_header(unsigned int format, const char *chain, struct iptc_handle *handle)
 524 {
 525         struct ipt_counters counters;
 526         const char *pol = iptc_get_policy(chain, &counters, handle);
 527         printf("Chain %s", chain);
 528         if (pol) {
 529                 printf(" (policy %s", pol);
 530                 if (!(format & FMT_NOCOUNTS)) {
 531                         fputc(' ', stdout);
 532                         print_num(counters.pcnt, (format|FMT_NOTABLE));
 533                         fputs("packets, ", stdout);
 534                         print_num(counters.bcnt, (format|FMT_NOTABLE));
 535                         fputs("bytes", stdout);
 536                 }
 537                 printf(")\n");
 538         } else {
 539                 unsigned int refs;
 540                 if (!iptc_get_references(&refs, chain, handle))
 541                         printf(" (ERROR obtaining refs)\n");
 542                 else
 543                         printf(" (%u references)\n", refs);
 544         }
 545
 546         if (format & FMT_LINENUMBERS)
 547                 printf(FMT("%-4s ", "%s "), "num");
 548         if (!(format & FMT_NOCOUNTS)) {
 549                 if (format & FMT_KILOMEGAGIGA) {
 550                         printf(FMT("%5s ","%s "), "pkts");
 551                         printf(FMT("%5s ","%s "), "bytes");
 552                 } else {
 553                         printf(FMT("%8s ","%s "), "pkts");
 554                         printf(FMT("%10s ","%s "), "bytes");
 555                 }
 556         }
 557         if (!(format & FMT_NOTARGET))
 558                 printf(FMT("%-9s ","%s "), "target");
 559         fputs(" prot ", stdout);
 560         if (format & FMT_OPTIONS)
 561                 fputs("opt", stdout);
 562         if (format & FMT_VIA) {
 563                 printf(FMT(" %-6s ","%s "), "in");
 564                 printf(FMT("%-6s ","%s "), "out");
 565         }
 566         printf(FMT(" %-19s ","%s "), "source");
 567         printf(FMT(" %-19s "," %s "), "destination");
 568         printf("\n");
 569 }
 570
 571
 572 static int
 573 print_match(const struct ipt_entry_match *m,
 574             const struct ipt_ip *ip,
 575             int numeric)
 576 {
 577         struct xtables_match *match =
 578                 xtables_find_match(m->u.user.name, XTF_TRY_LOAD, NULL);
 579
 580         if (match) {
 581                 if (match->print)
 582                         match->print(ip, m, numeric);
 583                 else
 584                         printf("%s ", match->name);
 585         } else {
 586                 if (m->u.user.name[0])
 587                         printf("UNKNOWN match `%s' ", m->u.user.name);
 588         }
 589         /* Don't stop iterating. */
 590         return 0;
 591 }
 592
 593 /* e is called `fw' here for historical reasons */
 594 static void
 595 print_firewall(const struct ipt_entry *fw,
 596                const char *targname,
 597                unsigned int num,
 598                unsigned int format,
 599                struct iptc_handle *const handle)
 600 {
 601         struct xtables_target *target = NULL;
 602         const struct ipt_entry_target *t;
 603         u_int8_t flags;
 604         char buf[BUFSIZ];
 605
 606         if (!iptc_is_chain(targname, handle))
 607                 target = xtables_find_target(targname, XTF_TRY_LOAD);
 608         else
 609                 target = xtables_find_target(IPT_STANDARD_TARGET,
 610                          XTF_LOAD_MUST_SUCCEED);
 611
 612         t = ipt_get_target((struct ipt_entry *)fw);
 613         flags = fw->ip.flags;
 614
 615         if (format & FMT_LINENUMBERS)
 616                 printf(FMT("%-4u ", "%u "), num);
 617
 618         if (!(format & FMT_NOCOUNTS)) {
 619                 print_num(fw->counters.pcnt, format);
 620                 print_num(fw->counters.bcnt, format);
 621         }
 622
 623         if (!(format & FMT_NOTARGET))
 624                 printf(FMT("%-9s ", "%s "), targname);
 625
 626         fputc(fw->ip.invflags & IPT_INV_PROTO ? '!' : ' ', stdout);
 627         {
 628                 const char *pname = proto_to_name(fw->ip.proto, format&FMT_NUMERIC);
 629                 if (pname)
 630                         printf(FMT("%-5s", "%s "), pname);
 631                 else
 632                         printf(FMT("%-5hu", "%hu "), fw->ip.proto);
 633         }
 634
 635         if (format & FMT_OPTIONS) {
 636                 if (format & FMT_NOTABLE)
 637                         fputs("opt ", stdout);
 638                 fputc(fw->ip.invflags & IPT_INV_FRAG ? '!' : '-', stdout);
 639                 fputc(flags & IPT_F_FRAG ? 'f' : '-', stdout);
 640                 fputc(' ', stdout);
 641         }
 642
 643         if (format & FMT_VIA) {
 644                 char iface[IFNAMSIZ+2];
 645
 646                 if (fw->ip.invflags & IPT_INV_VIA_IN) {
 647                         iface[0] = '!';
 648                         iface[1] = '\0';
 649                 }
 650                 else iface[0] = '\0';
 651
 652                 if (fw->ip.iniface[0] != '\0') {
 653                         strcat(iface, fw->ip.iniface);
 654                 }
 655                 else if (format & FMT_NUMERIC) strcat(iface, "*");
 656                 else strcat(iface, "any");
 657                 printf(FMT(" %-6s ","in %s "), iface);
 658
 659                 if (fw->ip.invflags & IPT_INV_VIA_OUT) {
 660                         iface[0] = '!';
 661                         iface[1] = '\0';
 662                 }
 663                 else iface[0] = '\0';
 664
 665                 if (fw->ip.outiface[0] != '\0') {
 666                         strcat(iface, fw->ip.outiface);
 667                 }
 668                 else if (format & FMT_NUMERIC) strcat(iface, "*");
 669                 else strcat(iface, "any");
 670                 printf(FMT("%-6s ","out %s "), iface);
 671         }
 672
 673         fputc(fw->ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout);
 674         if (fw->ip.smsk.s_addr == 0L && !(format & FMT_NUMERIC))
 675                 printf(FMT("%-19s ","%s "), "anywhere");
 676         else {
 677                 if (format & FMT_NUMERIC)
 678                         strcpy(buf, xtables_ipaddr_to_numeric(&fw->ip.src));
 679                 else
 680                         strcpy(buf, xtables_ipaddr_to_anyname(&fw->ip.src));
 681                 strcat(buf, xtables_ipmask_to_numeric(&fw->ip.smsk));
 682                 printf(FMT("%-19s ","%s "), buf);
 683         }
 684
 685         fputc(fw->ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout);
 686         if (fw->ip.dmsk.s_addr == 0L && !(format & FMT_NUMERIC))
 687                 printf(FMT("%-19s ","-> %s"), "anywhere");
 688         else {
 689                 if (format & FMT_NUMERIC)
 690                         strcpy(buf, xtables_ipaddr_to_numeric(&fw->ip.dst));
 691                 else
 692                         strcpy(buf, xtables_ipaddr_to_anyname(&fw->ip.dst));
 693                 strcat(buf, xtables_ipmask_to_numeric(&fw->ip.dmsk));
 694                 printf(FMT("%-19s ","-> %s"), buf);
 695         }
 696
 697         if (format & FMT_NOTABLE)
 698                 fputs("  ", stdout);
 699
 700 #ifdef IPT_F_GOTO
 701         if(fw->ip.flags & IPT_F_GOTO)
 702                 printf("[goto] ");
 703 #endif
 704
 705         IPT_MATCH_ITERATE(fw, print_match, &fw->ip, format & FMT_NUMERIC);
 706
 707         if (target) {
 708                 if (target->print)
 709                         /* Print the target information. */
 710                         target->print(&fw->ip, t, format & FMT_NUMERIC);
 711         } else if (t->u.target_size != sizeof(*t))
 712                 printf("[%u bytes of unknown target data] ",
 713                        (unsigned int)(t->u.target_size - sizeof(*t)));
 714
 715         if (!(format & FMT_NONEWLINE))
 716                 fputc('\n', stdout);
 717 }
 718
 719 static void
 720 print_firewall_line(const struct ipt_entry *fw,
 721                     struct iptc_handle *const h)
 722 {
 723         struct ipt_entry_target *t;
 724
 725         t = ipt_get_target((struct ipt_entry *)fw);
 726         print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h);
 727 }
 728
 729 static int
 730 append_entry(const ipt_chainlabel chain,
 731              struct ipt_entry *fw,
 732              unsigned int nsaddrs,
 733              const struct in_addr saddrs[],
 734              const struct in_addr smasks[],
 735              unsigned int ndaddrs,
 736              const struct in_addr daddrs[],
 737              const struct in_addr dmasks[],
 738              int verbose,
 739              struct iptc_handle *handle)
 740 {
 741         unsigned int i, j;
 742         int ret = 1;
 743
 744         for (i = 0; i < nsaddrs; i++) {
 745                 fw->ip.src.s_addr = saddrs[i].s_addr;
 746                 fw->ip.smsk.s_addr = smasks[i].s_addr;
 747                 for (j = 0; j < ndaddrs; j++) {
 748                         fw->ip.dst.s_addr = daddrs[j].s_addr;
 749                         fw->ip.dmsk.s_addr = dmasks[j].s_addr;
 750                         if (verbose)
 751                                 print_firewall_line(fw, handle);
 752                         ret &= iptc_append_entry(chain, fw, handle);
 753                 }
 754         }
 755
 756         return ret;
 757 }
 758
 759 static int
 760 replace_entry(const ipt_chainlabel chain,
 761               struct ipt_entry *fw,
 762               unsigned int rulenum,
 763               const struct in_addr *saddr, const struct in_addr *smask,
 764               const struct in_addr *daddr, const struct in_addr *dmask,
 765               int verbose,
 766               struct iptc_handle *handle)
 767 {
 768         fw->ip.src.s_addr = saddr->s_addr;
 769         fw->ip.dst.s_addr = daddr->s_addr;
 770         fw->ip.smsk.s_addr = smask->s_addr;
 771         fw->ip.dmsk.s_addr = dmask->s_addr;
 772
 773         if (verbose)
 774                 print_firewall_line(fw, handle);
 775         return iptc_replace_entry(chain, fw, rulenum, handle);
 776 }
 777
 778 static int
 779 insert_entry(const ipt_chainlabel chain,
 780              struct ipt_entry *fw,
 781              unsigned int rulenum,
 782              unsigned int nsaddrs,
 783              const struct in_addr saddrs[],
 784              const struct in_addr smasks[],
 785              unsigned int ndaddrs,
 786              const struct in_addr daddrs[],
 787              const struct in_addr dmasks[],
 788              int verbose,
 789              struct iptc_handle *handle)
 790 {
 791         unsigned int i, j;
 792         int ret = 1;
 793
 794         for (i = 0; i < nsaddrs; i++) {
 795                 fw->ip.src.s_addr = saddrs[i].s_addr;
 796                 fw->ip.smsk.s_addr = smasks[i].s_addr;
 797                 for (j = 0; j < ndaddrs; j++) {
 798                         fw->ip.dst.s_addr = daddrs[j].s_addr;
 799                         fw->ip.dmsk.s_addr = dmasks[j].s_addr;
 800                         if (verbose)
 801                                 print_firewall_line(fw, handle);
 802                         ret &= iptc_insert_entry(chain, fw, rulenum, handle);
 803                 }
 804         }
 805
 806         return ret;
 807 }
 808
 809 static unsigned char *
 810 make_delete_mask(struct xtables_rule_match *matches,
 811                  const struct xtables_target *target)
 812 {
 813         /* Establish mask for comparison */
 814         unsigned int size;
 815         struct xtables_rule_match *matchp;
 816         unsigned char *mask, *mptr;
 817
 818         size = sizeof(struct ipt_entry);
 819         for (matchp = matches; matchp; matchp = matchp->next)
 820                 size += IPT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size;
 821
 822         mask = xtables_calloc(1, size
 823                          + IPT_ALIGN(sizeof(struct ipt_entry_target))
 824                          + target->size);
 825
 826         memset(mask, 0xFF, sizeof(struct ipt_entry));
 827         mptr = mask + sizeof(struct ipt_entry);
 828
 829         for (matchp = matches; matchp; matchp = matchp->next) {
 830                 memset(mptr, 0xFF,
 831                        IPT_ALIGN(sizeof(struct ipt_entry_match))
 832                        + matchp->match->userspacesize);
 833                 mptr += IPT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size;
 834         }
 835
 836         memset(mptr, 0xFF,
 837                IPT_ALIGN(sizeof(struct ipt_entry_target))
 838                + target->userspacesize);
 839
 840         return mask;
 841 }
 842
 843 static int
 844 delete_entry(const ipt_chainlabel chain,
 845              struct ipt_entry *fw,
 846              unsigned int nsaddrs,
 847              const struct in_addr saddrs[],
 848              const struct in_addr smasks[],
 849              unsigned int ndaddrs,
 850              const struct in_addr daddrs[],
 851              const struct in_addr dmasks[],
 852              int verbose,
 853              struct iptc_handle *handle,
 854              struct xtables_rule_match *matches,
 855              const struct xtables_target *target)
 856 {
 857         unsigned int i, j;
 858         int ret = 1;
 859         unsigned char *mask;
 860
 861         mask = make_delete_mask(matches, target);
 862         for (i = 0; i < nsaddrs; i++) {
 863                 fw->ip.src.s_addr = saddrs[i].s_addr;
 864                 fw->ip.smsk.s_addr = smasks[i].s_addr;
 865                 for (j = 0; j < ndaddrs; j++) {
 866                         fw->ip.dst.s_addr = daddrs[j].s_addr;
 867                         fw->ip.dmsk.s_addr = dmasks[j].s_addr;
 868                         if (verbose)
 869                                 print_firewall_line(fw, handle);
 870                         ret &= iptc_delete_entry(chain, fw, mask, handle);
 871                 }
 872         }
 873         free(mask);
 874
 875         return ret;
 876 }
 877
 878 int
 879 for_each_chain(int (*fn)(const ipt_chainlabel, int, struct iptc_handle *),
 880                int verbose, int builtinstoo, struct iptc_handle *handle)
 881 {
 882         int ret = 1;
 883         const char *chain;
 884         char *chains;
 885         unsigned int i, chaincount = 0;
 886
 887         chain = iptc_first_chain(handle);
 888         while (chain) {
 889                 chaincount++;
 890                 chain = iptc_next_chain(handle);
 891         }
 892
 893         chains = xtables_malloc(sizeof(ipt_chainlabel) * chaincount);
 894         i = 0;
 895         chain = iptc_first_chain(handle);
 896         while (chain) {
 897                 strcpy(chains + i*sizeof(ipt_chainlabel), chain);
 898                 i++;
 899                 chain = iptc_next_chain(handle);
 900         }
 901
 902         for (i = 0; i < chaincount; i++) {
 903                 if (!builtinstoo
 904                     && iptc_builtin(chains + i*sizeof(ipt_chainlabel),
 905                                     handle) == 1)
 906                         continue;
 907                 ret &= fn(chains + i*sizeof(ipt_chainlabel), verbose, handle);
 908         }
 909
 910         free(chains);
 911         return ret;
 912 }
 913
 914 int
 915 flush_entries(const ipt_chainlabel chain, int verbose,
 916               struct iptc_handle *handle)
 917 {
 918         if (!chain)
 919                 return for_each_chain(flush_entries, verbose, 1, handle);
 920
 921         if (verbose)
 922                 fprintf(stdout, "Flushing chain `%s'\n", chain);
 923         return iptc_flush_entries(chain, handle);
 924 }
 925
 926 static int
 927 zero_entries(const ipt_chainlabel chain, int verbose,
 928              struct iptc_handle *handle)
 929 {
 930         if (!chain)
 931                 return for_each_chain(zero_entries, verbose, 1, handle);
 932
 933         if (verbose)
 934                 fprintf(stdout, "Zeroing chain `%s'\n", chain);
 935         return iptc_zero_entries(chain, handle);
 936 }
 937
 938 int
 939 delete_chain(const ipt_chainlabel chain, int verbose,
 940              struct iptc_handle *handle)
 941 {
 942         if (!chain)
 943                 return for_each_chain(delete_chain, verbose, 0, handle);
 944
 945         if (verbose)
 946                 fprintf(stdout, "Deleting chain `%s'\n", chain);
 947         return iptc_delete_chain(chain, handle);
 948 }
 949
 950 static int
 951 list_entries(const ipt_chainlabel chain, int rulenum, int verbose, int numeric,
 952              int expanded, int linenumbers, struct iptc_handle *handle)
 953 {
 954         int found = 0;
 955         unsigned int format;
 956         const char *this;
 957
 958         format = FMT_OPTIONS;
 959         if (!verbose)
 960                 format |= FMT_NOCOUNTS;
 961         else
 962                 format |= FMT_VIA;
 963
 964         if (numeric)
 965                 format |= FMT_NUMERIC;
 966
 967         if (!expanded)
 968                 format |= FMT_KILOMEGAGIGA;
 969
 970         if (linenumbers)
 971                 format |= FMT_LINENUMBERS;
 972
 973         for (this = iptc_first_chain(handle);
 974              this;
 975              this = iptc_next_chain(handle)) {
 976                 const struct ipt_entry *i;
 977                 unsigned int num;
 978
 979                 if (chain && strcmp(chain, this) != 0)
 980                         continue;
 981
 982                 if (found) printf("\n");
 983
 984                 if (!rulenum)
 985                         print_header(format, this, handle);
 986                 i = iptc_first_rule(this, handle);
 987
 988                 num = 0;
 989                 while (i) {
 990                         num++;
 991                         if (!rulenum || num == rulenum)
 992                                 print_firewall(i,
 993                                                iptc_get_target(i, handle),
 994                                                num,
 995                                                format,
 996                                                handle);
 997                         i = iptc_next_rule(i, handle);
 998                 }
 999                 found = 1;
1000         }
1001
1002         errno = ENOENT;
1003         return found;
1004 }
1005
1006 static void print_proto(u_int16_t proto, int invert)
1007 {
1008         if (proto) {
1009                 unsigned int i;
1010                 const char *invertstr = invert ? "! " : "";
1011
1012                 struct protoent *pent = getprotobynumber(proto);
1013                 if (pent) {
1014                         printf("%s-p %s ", invertstr, pent->p_name);
1015                         return;
1016                 }
1017
1018                 for (i = 0; xtables_chain_protos[i].name != NULL; ++i)
1019                         if (xtables_chain_protos[i].num == proto) {
1020                                 printf("%s-p %s ",
1021                                        invertstr, xtables_chain_protos[i].name);
1022                                 return;
1023                         }
1024
1025                 printf("%s-p %u ", invertstr, proto);
1026         }
1027 }
1028
1029 #define IP_PARTS_NATIVE(n)                      \
1030 (unsigned int)((n)>>24)&0xFF,                   \
1031 (unsigned int)((n)>>16)&0xFF,                   \
1032 (unsigned int)((n)>>8)&0xFF,                    \
1033 (unsigned int)((n)&0xFF)
1034
1035 #define IP_PARTS(n) IP_PARTS_NATIVE(ntohl(n))
1036
1037 /* This assumes that mask is contiguous, and byte-bounded. */
1038 static void
1039 print_iface(char letter, const char *iface, const unsigned char *mask,
1040             int invert)
1041 {
1042         unsigned int i;
1043
1044         if (mask[0] == 0)
1045                 return;
1046
1047         printf("%s-%c ", invert ? "! " : "", letter);
1048
1049         for (i = 0; i < IFNAMSIZ; i++) {
1050                 if (mask[i] != 0) {
1051                         if (iface[i] != '\0')
1052                                 printf("%c", iface[i]);
1053                 } else {
1054                         /* we can access iface[i-1] here, because
1055                          * a few lines above we make sure that mask[0] != 0 */
1056                         if (iface[i-1] != '\0')
1057                                 printf("+");
1058                         break;
1059                 }
1060         }
1061
1062         printf(" ");
1063 }
1064
1065 static int print_match_save(const struct ipt_entry_match *e,
1066                         const struct ipt_ip *ip)
1067 {
1068         struct xtables_match *match =
1069                 xtables_find_match(e->u.user.name, XTF_TRY_LOAD, NULL);
1070
1071         if (match) {
1072                 printf("-m %s ", e->u.user.name);
1073
1074                 /* some matches don't provide a save function */
1075                 if (match->save)
1076                         match->save(ip, e);
1077         } else {
1078                 if (e->u.match_size) {
1079                         fprintf(stderr,
1080                                 "Can't find library for match `%s'\n",
1081                                 e->u.user.name);
1082                         exit(1);
1083                 }
1084         }
1085         return 0;
1086 }
1087
1088 /* print a given ip including mask if neccessary */
1089 static void print_ip(char *prefix, u_int32_t ip, u_int32_t mask, int invert)
1090 {
1091         u_int32_t bits, hmask = ntohl(mask);
1092         int i;
1093
1094         if (!mask && !ip && !invert)
1095                 return;
1096
1097         printf("%s%s %u.%u.%u.%u",
1098                 invert ? "! " : "",
1099                 prefix,
1100                 IP_PARTS(ip));
1101
1102         if (mask == 0xFFFFFFFFU) {
1103                 printf("/32 ");
1104                 return;
1105         }
1106
1107         i    = 32;
1108         bits = 0xFFFFFFFEU;
1109         while (--i >= 0 && hmask != bits)
1110                 bits <<= 1;
1111         if (i >= 0)
1112                 printf("/%u ", i);
1113         else
1114                 printf("/%u.%u.%u.%u ", IP_PARTS(mask));
1115 }
1116
1117 /* We want this to be readable, so only print out neccessary fields.
1118  * Because that's the kind of world I want to live in.  */
1119 void print_rule(const struct ipt_entry *e,
1120                 struct iptc_handle *h, const char *chain, int counters)
1121 {
1122         struct ipt_entry_target *t;
1123         const char *target_name;
1124
1125         /* print counters for iptables-save */
1126         if (counters > 0)
1127                 printf("[%llu:%llu] ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt);
1128
1129         /* print chain name */
1130         printf("-A %s ", chain);
1131
1132         /* Print IP part. */
1133         print_ip("-s", e->ip.src.s_addr,e->ip.smsk.s_addr,
1134                         e->ip.invflags & IPT_INV_SRCIP);
1135
1136         print_ip("-d", e->ip.dst.s_addr, e->ip.dmsk.s_addr,
1137                         e->ip.invflags & IPT_INV_DSTIP);
1138
1139         print_iface('i', e->ip.iniface, e->ip.iniface_mask,
1140                     e->ip.invflags & IPT_INV_VIA_IN);
1141
1142         print_iface('o', e->ip.outiface, e->ip.outiface_mask,
1143                     e->ip.invflags & IPT_INV_VIA_OUT);
1144
1145         print_proto(e->ip.proto, e->ip.invflags & IPT_INV_PROTO);
1146
1147         if (e->ip.flags & IPT_F_FRAG)
1148                 printf("%s-f ",
1149                        e->ip.invflags & IPT_INV_FRAG ? "! " : "");
1150
1151         /* Print matchinfo part */
1152         if (e->target_offset) {
1153                 IPT_MATCH_ITERATE(e, print_match_save, &e->ip);
1154         }
1155
1156         /* print counters for iptables -R */
1157         if (counters < 0)
1158                 printf("-c %llu %llu ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt);
1159
1160         /* Print target name */
1161         target_name = iptc_get_target(e, h);
1162         if (target_name && (*target_name != '\0'))
1163 #ifdef IPT_F_GOTO
1164                 printf("-%c %s ", e->ip.flags & IPT_F_GOTO ? 'g' : 'j', target_name);
1165 #else
1166                 printf("-j %s ", target_name);
1167 #endif
1168
1169         /* Print targinfo part */
1170         t = ipt_get_target((struct ipt_entry *)e);
1171         if (t->u.user.name[0]) {
1172                 struct xtables_target *target =
1173                         xtables_find_target(t->u.user.name, XTF_TRY_LOAD);
1174
1175                 if (!target) {
1176                         fprintf(stderr, "Can't find library for target `%s'\n",
1177                                 t->u.user.name);
1178                         exit(1);
1179                 }
1180
1181                 if (target->save)
1182                         target->save(&e->ip, t);
1183                 else {
1184                         /* If the target size is greater than ipt_entry_target
1185                          * there is something to be saved, we just don't know
1186                          * how to print it */
1187                         if (t->u.target_size !=
1188                             sizeof(struct ipt_entry_target)) {
1189                                 fprintf(stderr, "Target `%s' is missing "
1190                                                 "save function\n",
1191                                         t->u.user.name);
1192                                 exit(1);
1193                         }
1194                 }
1195         }
1196         printf("\n");
1197 }
1198
1199 static int
1200 list_rules(const ipt_chainlabel chain, int rulenum, int counters,
1201              struct iptc_handle *handle)
1202 {
1203         const char *this = NULL;
1204         int found = 0;
1205
1206         if (counters)
1207             counters = -1;              /* iptables -c format */
1208
1209         /* Dump out chain names first,
1210          * thereby preventing dependency conflicts */
1211         if (!rulenum) for (this = iptc_first_chain(handle);
1212              this;
1213              this = iptc_next_chain(handle)) {
1214                 if (chain && strcmp(this, chain) != 0)
1215                         continue;
1216
1217                 if (iptc_builtin(this, handle)) {
1218                         struct ipt_counters count;
1219                         printf("-P %s %s", this, iptc_get_policy(this, &count, handle));
1220                         if (counters)
1221                             printf(" -c %llu %llu", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt);
1222                         printf("\n");
1223                 } else {
1224                         printf("-N %s\n", this);
1225                 }
1226         }
1227
1228         for (this = iptc_first_chain(handle);
1229              this;
1230              this = iptc_next_chain(handle)) {
1231                 const struct ipt_entry *e;
1232                 int num = 0;
1233
1234                 if (chain && strcmp(this, chain) != 0)
1235                         continue;
1236
1237                 /* Dump out rules */
1238                 e = iptc_first_rule(this, handle);
1239                 while(e) {
1240                         num++;
1241                         if (!rulenum || num == rulenum)
1242                             print_rule(e, handle, this, counters);
1243                         e = iptc_next_rule(e, handle);
1244                 }
1245                 found = 1;
1246         }
1247
1248         errno = ENOENT;
1249         return found;
1250 }
1251
1252 static struct ipt_entry *
1253 generate_entry(const struct ipt_entry *fw,
1254                struct xtables_rule_match *matches,
1255                struct ipt_entry_target *target)
1256 {
1257         unsigned int size;
1258         struct xtables_rule_match *matchp;
1259         struct ipt_entry *e;
1260
1261         size = sizeof(struct ipt_entry);
1262         for (matchp = matches; matchp; matchp = matchp->next)
1263                 size += matchp->match->m->u.match_size;
1264
1265         e = xtables_malloc(size + target->u.target_size);
1266         *e = *fw;
1267         e->target_offset = size;
1268         e->next_offset = size + target->u.target_size;
1269
1270         size = 0;
1271         for (matchp = matches; matchp; matchp = matchp->next) {
1272                 memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size);
1273                 size += matchp->match->m->u.match_size;
1274         }
1275         memcpy(e->elems + size, target, target->u.target_size);
1276
1277         return e;
1278 }
1279
1280 static void clear_rule_matches(struct xtables_rule_match **matches)
1281 {
1282         struct xtables_rule_match *matchp, *tmp;
1283
1284         for (matchp = *matches; matchp;) {
1285                 tmp = matchp->next;
1286                 if (matchp->match->m) {
1287                         free(matchp->match->m);
1288                         matchp->match->m = NULL;
1289                 }
1290                 if (matchp->match == matchp->match->next) {
1291                         free(matchp->match);
1292                         matchp->match = NULL;
1293                 }
1294                 free(matchp);
1295                 matchp = tmp;
1296         }
1297
1298         *matches = NULL;
1299 }
1300
1301 void
1302 get_kernel_version(void) {
1303         static struct utsname uts;
1304         int x = 0, y = 0, z = 0;
1305
1306         if (uname(&uts) == -1) {
1307                 fprintf(stderr, "Unable to retrieve kernel version.\n");
1308                 xtables_free_opts(1);
1309                 exit(1);
1310         }
1311
1312         sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
1313         kernel_version = LINUX_VERSION(x, y, z);
1314 }
1315
1316 int do_command(int argc, char *argv[], char **table, struct iptc_handle **handle)
1317 {
1318         struct ipt_entry fw, *e = NULL;
1319         int invert = 0;
1320         unsigned int nsaddrs = 0, ndaddrs = 0;
1321         struct in_addr *saddrs = NULL, *smasks = NULL;
1322         struct in_addr *daddrs = NULL, *dmasks = NULL;
1323
1324         int c, verbose = 0;
1325         const char *chain = NULL;
1326         const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL;
1327         const char *policy = NULL, *newname = NULL;
1328         unsigned int rulenum = 0, options = 0, command = 0;
1329         const char *pcnt = NULL, *bcnt = NULL;
1330         int ret = 1;
1331         struct xtables_match *m;
1332         struct xtables_rule_match *matches = NULL;
1333         struct xtables_rule_match *matchp;
1334         struct xtables_target *target = NULL;
1335         struct xtables_target *t;
1336         const char *jumpto = "";
1337         char *protocol = NULL;
1338         int proto_used = 0;
1339         unsigned long long cnt;
1340
1341         memset(&fw, 0, sizeof(fw));
1342
1343         /* re-set optind to 0 in case do_command gets called
1344          * a second time */
1345         optind = 0;
1346
1347         /* clear mflags in case do_command gets called a second time
1348          * (we clear the global list of all matches for security)*/
1349         for (m = xtables_matches; m; m = m->next)
1350                 m->mflags = 0;
1351
1352         for (t = xtables_targets; t; t = t->next) {
1353                 t->tflags = 0;
1354                 t->used = 0;
1355         }
1356
1357         /* Suppress error messages: we may add new options if we
1358            demand-load a protocol. */
1359         opterr = 0;
1360
1361         while ((c = getopt_long(argc, argv,
1362            "-A:D:R:I:L::S::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:fbvnt:m:xc:g:",
1363                                            opts, NULL)) != -1) {
1364                 switch (c) {
1365                         /*
1366                          * Command selection
1367                          */
1368                 case 'A':
1369                         add_command(&command, CMD_APPEND, CMD_NONE,
1370                                     invert);
1371                         chain = optarg;
1372                         break;
1373
1374                 case 'D':
1375                         add_command(&command, CMD_DELETE, CMD_NONE,
1376                                     invert);
1377                         chain = optarg;
1378                         if (optind < argc && argv[optind][0] != '-'
1379                             && argv[optind][0] != '!') {
1380                                 rulenum = parse_rulenumber(argv[optind++]);
1381                                 command = CMD_DELETE_NUM;
1382                         }
1383                         break;
1384
1385                 case 'R':
1386                         add_command(&command, CMD_REPLACE, CMD_NONE,
1387                                     invert);
1388                         chain = optarg;
1389                         if (optind < argc && argv[optind][0] != '-'
1390                             && argv[optind][0] != '!')
1391                                 rulenum = parse_rulenumber(argv[optind++]);
1392                         else
1393                                 xtables_error(PARAMETER_PROBLEM,
1394                                            "-%c requires a rule number",
1395                                            cmd2char(CMD_REPLACE));
1396                         break;
1397
1398                 case 'I':
1399                         add_command(&command, CMD_INSERT, CMD_NONE,
1400                                     invert);
1401                         chain = optarg;
1402                         if (optind < argc && argv[optind][0] != '-'
1403                             && argv[optind][0] != '!')
1404                                 rulenum = parse_rulenumber(argv[optind++]);
1405                         else rulenum = 1;
1406                         break;
1407
1408                 case 'L':
1409                         add_command(&command, CMD_LIST,
1410                                     CMD_ZERO | CMD_ZERO_NUM, invert);
1411                         if (optarg) chain = optarg;
1412                         else if (optind < argc && argv[optind][0] != '-'
1413                                  && argv[optind][0] != '!')
1414                                 chain = argv[optind++];
1415                         if (optind < argc && argv[optind][0] != '-'
1416                             && argv[optind][0] != '!')
1417                                 rulenum = parse_rulenumber(argv[optind++]);
1418                         break;
1419
1420                 case 'S':
1421                         add_command(&command, CMD_LIST_RULES,
1422                                     CMD_ZERO|CMD_ZERO_NUM, invert);
1423                         if (optarg) chain = optarg;
1424                         else if (optind < argc && argv[optind][0] != '-'
1425                                  && argv[optind][0] != '!')
1426                                 chain = argv[optind++];
1427                         if (optind < argc && argv[optind][0] != '-'
1428                             && argv[optind][0] != '!')
1429                                 rulenum = parse_rulenumber(argv[optind++]);
1430                         break;
1431
1432                 case 'F':
1433                         add_command(&command, CMD_FLUSH, CMD_NONE,
1434                                     invert);
1435                         if (optarg) chain = optarg;
1436                         else if (optind < argc && argv[optind][0] != '-'
1437                                  && argv[optind][0] != '!')
1438                                 chain = argv[optind++];
1439                         break;
1440
1441                 case 'Z':
1442                         add_command(&command, CMD_ZERO, CMD_LIST|CMD_LIST_RULES,
1443                                     invert);
1444                         if (optarg) chain = optarg;
1445                         else if (optind < argc && argv[optind][0] != '-'
1446                                 && argv[optind][0] != '!')
1447                                 chain = argv[optind++];
1448                         if (optind < argc && argv[optind][0] != '-'
1449                                 && argv[optind][0] != '!') {
1450                                 rulenum = parse_rulenumber(argv[optind++]);
1451                                 command = CMD_ZERO_NUM;
1452                         }
1453                         break;
1454
1455                 case 'N':
1456                         if (optarg && (*optarg == '-' || *optarg == '!'))
1457                                 xtables_error(PARAMETER_PROBLEM,
1458                                            "chain name not allowed to start "
1459                                            "with `%c'\n", *optarg);
1460                         if (xtables_find_target(optarg, XTF_TRY_LOAD))
1461                                 xtables_error(PARAMETER_PROBLEM,
1462                                            "chain name may not clash "
1463                                            "with target name\n");
1464                         add_command(&command, CMD_NEW_CHAIN, CMD_NONE,
1465                                     invert);
1466                         chain = optarg;
1467                         break;
1468
1469                 case 'X':
1470                         add_command(&command, CMD_DELETE_CHAIN, CMD_NONE,
1471                                     invert);
1472                         if (optarg) chain = optarg;
1473                         else if (optind < argc && argv[optind][0] != '-'
1474                                  && argv[optind][0] != '!')
1475                                 chain = argv[optind++];
1476                         break;
1477
1478                 case 'E':
1479                         add_command(&command, CMD_RENAME_CHAIN, CMD_NONE,
1480                                     invert);
1481                         chain = optarg;
1482                         if (optind < argc && argv[optind][0] != '-'
1483                             && argv[optind][0] != '!')
1484                                 newname = argv[optind++];
1485                         else
1486                                 xtables_error(PARAMETER_PROBLEM,
1487                                            "-%c requires old-chain-name and "
1488                                            "new-chain-name",
1489                                             cmd2char(CMD_RENAME_CHAIN));
1490                         break;
1491
1492                 case 'P':
1493                         add_command(&command, CMD_SET_POLICY, CMD_NONE,
1494                                     invert);
1495                         chain = optarg;
1496                         if (optind < argc && argv[optind][0] != '-'
1497                             && argv[optind][0] != '!')
1498                                 policy = argv[optind++];
1499                         else
1500                                 xtables_error(PARAMETER_PROBLEM,
1501                                            "-%c requires a chain and a policy",
1502                                            cmd2char(CMD_SET_POLICY));
1503                         break;
1504
1505                 case 'h':
1506                         if (!optarg)
1507                                 optarg = argv[optind];
1508
1509                         /* iptables -p icmp -h */
1510                         if (!matches && protocol)
1511                                 xtables_find_match(protocol,
1512                                         XTF_TRY_LOAD, &matches);
1513
1514                         exit_printhelp(matches);
1515
1516                         /*
1517                          * Option selection
1518                          */
1519                 case 'p':
1520                         xtables_check_inverse(optarg, &invert, &optind, argc, argv);
1521                         set_option(&options, OPT_PROTOCOL, &fw.ip.invflags,
1522                                    invert);
1523
1524                         /* Canonicalize into lower case */
1525                         for (protocol = optarg; *protocol; protocol++)
1526                                 *protocol = tolower(*protocol);
1527
1528                         protocol = optarg;
1529                         fw.ip.proto = xtables_parse_protocol(protocol);
1530
1531                         if (fw.ip.proto == 0
1532                             && (fw.ip.invflags & IPT_INV_PROTO))
1533                                 xtables_error(PARAMETER_PROBLEM,
1534                                            "rule would never match protocol");
1535                         break;
1536
1537                 case 's':
1538                         xtables_check_inverse(optarg, &invert, &optind, argc, argv);
1539                         set_option(&options, OPT_SOURCE, &fw.ip.invflags,
1540                                    invert);
1541                         shostnetworkmask = optarg;
1542                         break;
1543
1544                 case 'd':
1545                         xtables_check_inverse(optarg, &invert, &optind, argc, argv);
1546                         set_option(&options, OPT_DESTINATION, &fw.ip.invflags,
1547                                    invert);
1548                         dhostnetworkmask = optarg;
1549                         break;
1550
1551 #ifdef IPT_F_GOTO
1552                 case 'g':
1553                         set_option(&options, OPT_JUMP, &fw.ip.invflags,
1554                                    invert);
1555                         fw.ip.flags |= IPT_F_GOTO;
1556                         jumpto = parse_target(optarg);
1557                         break;
1558 #endif
1559
1560                 case 'j':
1561                         set_option(&options, OPT_JUMP, &fw.ip.invflags,
1562                                    invert);
1563                         jumpto = parse_target(optarg);
1564                         /* TRY_LOAD (may be chain name) */
1565                         target = xtables_find_target(jumpto, XTF_TRY_LOAD);
1566
1567                         if (target) {
1568                                 size_t size;
1569
1570                                 size = IPT_ALIGN(sizeof(struct ipt_entry_target))
1571                                         + target->size;
1572
1573                                 target->t = xtables_calloc(1, size);
1574                                 target->t->u.target_size = size;
1575                                 strcpy(target->t->u.user.name, jumpto);
1576                                 target->t->u.user.revision = target->revision;
1577                                 if (target->init != NULL)
1578                                         target->init(target->t);
1579                                 opts = xtables_merge_options(opts,
1580                                                      target->extra_opts,
1581                                                      &target->option_offset);
1582                                 if (opts == NULL)
1583                                         xtables_error(OTHER_PROBLEM,
1584                                                    "can't alloc memory!");
1585                         }
1586                         break;
1587
1588
1589                 case 'i':
1590                         xtables_check_inverse(optarg, &invert, &optind, argc, argv);
1591                         set_option(&options, OPT_VIANAMEIN, &fw.ip.invflags,
1592                                    invert);
1593                         xtables_parse_interface(optarg,
1594                                         fw.ip.iniface,
1595                                         fw.ip.iniface_mask);
1596                         break;
1597
1598                 case 'o':
1599                         xtables_check_inverse(optarg, &invert, &optind, argc, argv);
1600                         set_option(&options, OPT_VIANAMEOUT, &fw.ip.invflags,
1601                                    invert);
1602                         xtables_parse_interface(optarg,
1603                                         fw.ip.outiface,
1604                                         fw.ip.outiface_mask);
1605                         break;
1606
1607                 case 'f':
1608                         set_option(&options, OPT_FRAGMENT, &fw.ip.invflags,
1609                                    invert);
1610                         fw.ip.flags |= IPT_F_FRAG;
1611                         break;
1612
1613                 case 'v':
1614                         if (!verbose)
1615                                 set_option(&options, OPT_VERBOSE,
1616                                            &fw.ip.invflags, invert);
1617                         verbose++;
1618                         break;
1619
1620                 case 'm': {
1621                         size_t size;
1622
1623                         if (invert)
1624                                 xtables_error(PARAMETER_PROBLEM,
1625                                            "unexpected ! flag before --match");
1626
1627                         m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED,
1628                             &matches);
1629                         size = IPT_ALIGN(sizeof(struct ipt_entry_match))
1630                                          + m->size;
1631                         m->m = xtables_calloc(1, size);
1632                         m->m->u.match_size = size;
1633                         strcpy(m->m->u.user.name, m->name);
1634                         m->m->u.user.revision = m->revision;
1635                         if (m->init != NULL)
1636                                 m->init(m->m);
1637                         if (m != m->next) {
1638                                 /* Merge options for non-cloned matches */
1639                                 opts = xtables_merge_options(opts,
1640                                                      m->extra_opts,
1641                                                      &m->option_offset);
1642                                 if (opts == NULL)
1643                                         xtables_error(OTHER_PROBLEM,
1644                                                    "can't alloc memory!");
1645                         }
1646                 }
1647                 break;
1648
1649                 case 'n':
1650                         set_option(&options, OPT_NUMERIC, &fw.ip.invflags,
1651                                    invert);
1652                         break;
1653
1654                 case 't':
1655                         if (invert)
1656                                 xtables_error(PARAMETER_PROBLEM,
1657                                            "unexpected ! flag before --table");
1658                         *table = optarg;
1659                         break;
1660
1661                 case 'x':
1662                         set_option(&options, OPT_EXPANDED, &fw.ip.invflags,
1663                                    invert);
1664                         break;
1665
1666                 case 'V':
1667                         if (invert)
1668                                 printf("Not %s ;-)\n", prog_vers);
1669                         else
1670                                 printf("%s v%s\n",
1671                                        prog_name, prog_vers);
1672                         exit(0);
1673
1674                 case '0':
1675                         set_option(&options, OPT_LINENUMBERS, &fw.ip.invflags,
1676                                    invert);
1677                         break;
1678
1679                 case 'M':
1680                         xtables_modprobe_program = optarg;
1681                         break;
1682
1683                 case 'c':
1684
1685                         set_option(&options, OPT_COUNTERS, &fw.ip.invflags,
1686                                    invert);
1687                         pcnt = optarg;
1688                         bcnt = strchr(pcnt + 1, ',');
1689                         if (bcnt)
1690                             bcnt++;
1691                         if (!bcnt && optind < argc && argv[optind][0] != '-'
1692                             && argv[optind][0] != '!')
1693                                 bcnt = argv[optind++];
1694                         if (!bcnt)
1695                                 xtables_error(PARAMETER_PROBLEM,
1696                                         "-%c requires packet and byte counter",
1697                                         opt2char(OPT_COUNTERS));
1698
1699                         if (sscanf(pcnt, "%llu", &cnt) != 1)
1700                                 xtables_error(PARAMETER_PROBLEM,
1701                                         "-%c packet counter not numeric",
1702                                         opt2char(OPT_COUNTERS));
1703                         fw.counters.pcnt = cnt;
1704
1705                         if (sscanf(bcnt, "%llu", &cnt) != 1)
1706                                 xtables_error(PARAMETER_PROBLEM,
1707                                         "-%c byte counter not numeric",
1708                                         opt2char(OPT_COUNTERS));
1709                         fw.counters.bcnt = cnt;
1710                         break;
1711
1712
1713                 case 1: /* non option */
1714                         if (optarg[0] == '!' && optarg[1] == '\0') {
1715                                 if (invert)
1716                                         xtables_error(PARAMETER_PROBLEM,
1717                                                    "multiple consecutive ! not"
1718                                                    " allowed");
1719                                 invert = TRUE;
1720                                 optarg[0] = '\0';
1721                                 continue;
1722                         }
1723                         fprintf(stderr, "Bad argument `%s'\n", optarg);
1724                         exit_tryhelp(2);
1725
1726                 default:
1727                         if (target == NULL || target->parse == NULL ||
1728                             !target->parse(c - target->option_offset,
1729                                                argv, invert,
1730                                                &target->tflags,
1731                                                &fw, &target->t)) {
1732                                 for (matchp = matches; matchp; matchp = matchp->next) {
1733                                         if (matchp->completed ||
1734                                             matchp->match->parse == NULL)
1735                                                 continue;
1736                                         if (matchp->match->parse(c - matchp->match->option_offset,
1737                                                      argv, invert,
1738                                                      &matchp->match->mflags,
1739                                                      &fw,
1740                                                      &matchp->match->m))
1741                                                 break;
1742                                 }
1743                                 m = matchp ? matchp->match : NULL;
1744
1745                                 /* If you listen carefully, you can
1746                                    actually hear this code suck. */
1747
1748                                 /* some explanations (after four different bugs
1749                                  * in 3 different releases): If we encounter a
1750                                  * parameter, that has not been parsed yet,
1751                                  * it's not an option of an explicitly loaded
1752                                  * match or a target.  However, we support
1753                                  * implicit loading of the protocol match
1754                                  * extension.  '-p tcp' means 'l4 proto 6' and
1755                                  * at the same time 'load tcp protocol match on
1756                                  * demand if we specify --dport'.
1757                                  *
1758                                  * To make this work, we need to make sure:
1759                                  * - the parameter has not been parsed by
1760                                  *   a match (m above)
1761                                  * - a protocol has been specified
1762                                  * - the protocol extension has not been
1763                                  *   loaded yet, or is loaded and unused
1764                                  *   [think of iptables-restore!]
1765                                  * - the protocol extension can be successively
1766                                  *   loaded
1767                                  */
1768                                 if (m == NULL
1769                                     && protocol
1770                                     && (!find_proto(protocol, XTF_DONT_LOAD,
1771                                                    options&OPT_NUMERIC, NULL)
1772                                         || (find_proto(protocol, XTF_DONT_LOAD,
1773                                                         options&OPT_NUMERIC, NULL)
1774                                             && (proto_used == 0))
1775                                        )
1776                                     && (m = find_proto(protocol, XTF_TRY_LOAD,
1777                                                        options&OPT_NUMERIC, &matches))) {
1778                                         /* Try loading protocol */
1779                                         size_t size;
1780
1781                                         proto_used = 1;
1782
1783                                         size = IPT_ALIGN(sizeof(struct ipt_entry_match))
1784                                                          + m->size;
1785
1786                                         m->m = xtables_calloc(1, size);
1787                                         m->m->u.match_size = size;
1788                                         strcpy(m->m->u.user.name, m->name);
1789                                         m->m->u.user.revision = m->revision;
1790                                         if (m->init != NULL)
1791                                                 m->init(m->m);
1792
1793                                         opts = xtables_merge_options(opts,
1794                                                              m->extra_opts,
1795                                                              &m->option_offset);
1796                                         if (opts == NULL)
1797                                                 xtables_error(OTHER_PROBLEM,
1798                                                         "can't alloc memory!");
1799
1800                                         optind--;
1801                                         continue;
1802                                 }
1803                                 if (!m) {
1804                                         if (c == '?') {
1805                                                 if (optopt) {
1806                                                         xtables_error(
1807                                                            PARAMETER_PROBLEM,
1808                                                            "option `%s' "
1809                                                            "requires an "
1810                                                            "argument",
1811                                                            argv[optind-1]);
1812                                                 } else {
1813                                                         xtables_error(
1814                                                            PARAMETER_PROBLEM,
1815                                                            "unknown option "
1816                                                            "`%s'",
1817                                                            argv[optind-1]);
1818                                                 }
1819                                         }
1820                                         xtables_error(PARAMETER_PROBLEM,
1821                                                    "Unknown arg `%s'", optarg);
1822                                 }
1823                         }
1824                 }
1825                 invert = FALSE;
1826         }
1827
1828         if (strcmp(*table, "nat") == 0 &&
1829             ((policy != NULL && strcmp(policy, "DROP") == 0) ||
1830             (jumpto != NULL && strcmp(jumpto, "DROP") == 0)))
1831                 xtables_error(PARAMETER_PROBLEM,
1832                         "\nThe \"nat\" table is not intended for filtering, "
1833                         "the use of DROP is therefore inhibited.\n\n");
1834
1835         for (matchp = matches; matchp; matchp = matchp->next)
1836                 if (matchp->match->final_check != NULL)
1837                         matchp->match->final_check(matchp->match->mflags);
1838
1839         if (target != NULL && target->final_check != NULL)
1840                 target->final_check(target->tflags);
1841
1842         /* Fix me: must put inverse options checking here --MN */
1843
1844         if (optind < argc)
1845                 xtables_error(PARAMETER_PROBLEM,
1846                            "unknown arguments found on commandline");
1847         if (!command)
1848                 xtables_error(PARAMETER_PROBLEM, "no command specified");
1849         if (invert)
1850                 xtables_error(PARAMETER_PROBLEM,
1851                            "nothing appropriate following !");
1852
1853         if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND)) {
1854                 if (!(options & OPT_DESTINATION))
1855                         dhostnetworkmask = "0.0.0.0/0";
1856                 if (!(options & OPT_SOURCE))
1857                         shostnetworkmask = "0.0.0.0/0";
1858         }
1859
1860         if (shostnetworkmask)
1861                 xtables_ipparse_multiple(shostnetworkmask, &saddrs,
1862                                          &smasks, &nsaddrs);
1863
1864         if (dhostnetworkmask)
1865                 xtables_ipparse_multiple(dhostnetworkmask, &daddrs,
1866                                          &dmasks, &ndaddrs);
1867
1868         if ((nsaddrs > 1 || ndaddrs > 1) &&
1869             (fw.ip.invflags & (IPT_INV_SRCIP | IPT_INV_DSTIP)))
1870                 xtables_error(PARAMETER_PROBLEM, "! not allowed with multiple"
1871                            " source or destination IP addresses");
1872
1873         if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1))
1874                 xtables_error(PARAMETER_PROBLEM, "Replacement rule does not "
1875                            "specify a unique address");
1876
1877         generic_opt_check(command, options);
1878
1879         if (chain && strlen(chain) > IPT_FUNCTION_MAXNAMELEN)
1880                 xtables_error(PARAMETER_PROBLEM,
1881                            "chain name `%s' too long (must be under %i chars)",
1882                            chain, IPT_FUNCTION_MAXNAMELEN);
1883
1884         /* only allocate handle if we weren't called with a handle */
1885         if (!*handle)
1886                 *handle = iptc_init(*table);
1887
1888         /* try to insmod the module if iptc_init failed */
1889         if (!*handle && xtables_load_ko(xtables_modprobe_program, false) != -1)
1890                 *handle = iptc_init(*table);
1891
1892         if (!*handle)
1893                 xtables_error(VERSION_PROBLEM,
1894                            "can't initialize iptables table `%s': %s",
1895                            *table, iptc_strerror(errno));
1896
1897         if (command == CMD_APPEND
1898             || command == CMD_DELETE
1899             || command == CMD_INSERT
1900             || command == CMD_REPLACE) {
1901                 if (strcmp(chain, "PREROUTING") == 0
1902                     || strcmp(chain, "INPUT") == 0) {
1903                         /* -o not valid with incoming packets. */
1904                         if (options & OPT_VIANAMEOUT)
1905                                 xtables_error(PARAMETER_PROBLEM,
1906                                            "Can't use -%c with %s\n",
1907                                            opt2char(OPT_VIANAMEOUT),
1908                                            chain);
1909                 }
1910
1911                 if (strcmp(chain, "POSTROUTING") == 0
1912                     || strcmp(chain, "OUTPUT") == 0) {
1913                         /* -i not valid with outgoing packets */
1914                         if (options & OPT_VIANAMEIN)
1915                                 xtables_error(PARAMETER_PROBLEM,
1916                                            "Can't use -%c with %s\n",
1917                                            opt2char(OPT_VIANAMEIN),
1918                                            chain);
1919                 }
1920
1921                 if (target && iptc_is_chain(jumpto, *handle)) {
1922                         fprintf(stderr,
1923                                 "Warning: using chain %s, not extension\n",
1924                                 jumpto);
1925
1926                         if (target->t)
1927                                 free(target->t);
1928
1929                         target = NULL;
1930                 }
1931
1932                 /* If they didn't specify a target, or it's a chain
1933                    name, use standard. */
1934                 if (!target
1935                     && (strlen(jumpto) == 0
1936                         || iptc_is_chain(jumpto, *handle))) {
1937                         size_t size;
1938
1939                         target = xtables_find_target(IPT_STANDARD_TARGET,
1940                                          XTF_LOAD_MUST_SUCCEED);
1941
1942                         size = sizeof(struct ipt_entry_target)
1943                                 + target->size;
1944                         target->t = xtables_calloc(1, size);
1945                         target->t->u.target_size = size;
1946                         strcpy(target->t->u.user.name, jumpto);
1947                         if (!iptc_is_chain(jumpto, *handle))
1948                                 target->t->u.user.revision = target->revision;
1949                         if (target->init != NULL)
1950                                 target->init(target->t);
1951                 }
1952
1953                 if (!target) {
1954                         /* it is no chain, and we can't load a plugin.
1955                          * We cannot know if the plugin is corrupt, non
1956                          * existant OR if the user just misspelled a
1957                          * chain. */
1958 #ifdef IPT_F_GOTO
1959                         if (fw.ip.flags & IPT_F_GOTO)
1960                                 xtables_error(PARAMETER_PROBLEM,
1961                                            "goto '%s' is not a chain\n", jumpto);
1962 #endif
1963                         xtables_find_target(jumpto, XTF_LOAD_MUST_SUCCEED);
1964                 } else {
1965                         e = generate_entry(&fw, matches, target->t);
1966                         free(target->t);
1967                 }
1968         }
1969
1970         switch (command) {
1971         case CMD_APPEND:
1972                 ret = append_entry(chain, e,
1973                                    nsaddrs, saddrs, smasks,
1974                                    ndaddrs, daddrs, dmasks,
1975                                    options&OPT_VERBOSE,
1976                                    *handle);
1977                 break;
1978         case CMD_DELETE:
1979                 ret = delete_entry(chain, e,
1980                                    nsaddrs, saddrs, smasks,
1981                                    ndaddrs, daddrs, dmasks,
1982                                    options&OPT_VERBOSE,
1983                                    *handle, matches, target);
1984                 break;
1985         case CMD_DELETE_NUM:
1986                 ret = iptc_delete_num_entry(chain, rulenum - 1, *handle);
1987                 break;
1988         case CMD_REPLACE:
1989                 ret = replace_entry(chain, e, rulenum - 1,
1990                                     saddrs, smasks, daddrs, dmasks,
1991                                     options&OPT_VERBOSE, *handle);
1992                 break;
1993         case CMD_INSERT:
1994                 ret = insert_entry(chain, e, rulenum - 1,
1995                                    nsaddrs, saddrs, smasks,
1996                                    ndaddrs, daddrs, dmasks,
1997                                    options&OPT_VERBOSE,
1998                                    *handle);
1999                 break;
2000         case CMD_FLUSH:
2001                 ret = flush_entries(chain, options&OPT_VERBOSE, *handle);
2002                 break;
2003         case CMD_ZERO:
2004                 ret = zero_entries(chain, options&OPT_VERBOSE, *handle);
2005                 break;
2006         case CMD_ZERO_NUM:
2007                 ret = iptc_zero_counter(chain, rulenum, *handle);
2008                 break;
2009         case CMD_LIST:
2010         case CMD_LIST|CMD_ZERO:
2011         case CMD_LIST|CMD_ZERO_NUM:
2012                 ret = list_entries(chain,
2013                                    rulenum,
2014                                    options&OPT_VERBOSE,
2015                                    options&OPT_NUMERIC,
2016                                    options&OPT_EXPANDED,
2017                                    options&OPT_LINENUMBERS,
2018                                    *handle);
2019                 if (ret && (command & CMD_ZERO))
2020                         ret = zero_entries(chain,
2021                                            options&OPT_VERBOSE, *handle);
2022                 if (ret && (command & CMD_ZERO_NUM))
2023                         ret = iptc_zero_counter(chain, rulenum, *handle);
2024                 break;
2025         case CMD_LIST_RULES:
2026         case CMD_LIST_RULES|CMD_ZERO:
2027         case CMD_LIST_RULES|CMD_ZERO_NUM:
2028                 ret = list_rules(chain,
2029                                    rulenum,
2030                                    options&OPT_VERBOSE,
2031                                    *handle);
2032                 if (ret && (command & CMD_ZERO))
2033                         ret = zero_entries(chain,
2034                                            options&OPT_VERBOSE, *handle);
2035                 if (ret && (command & CMD_ZERO_NUM))
2036                         ret = iptc_zero_counter(chain, rulenum, *handle);
2037                 break;
2038         case CMD_NEW_CHAIN:
2039                 ret = iptc_create_chain(chain, *handle);
2040                 break;
2041         case CMD_DELETE_CHAIN:
2042                 ret = delete_chain(chain, options&OPT_VERBOSE, *handle);
2043                 break;
2044         case CMD_RENAME_CHAIN:
2045                 ret = iptc_rename_chain(chain, newname, *handle);
2046                 break;
2047         case CMD_SET_POLICY:
2048                 ret = iptc_set_policy(chain, policy, options&OPT_COUNTERS ? &fw.counters : NULL, *handle);
2049                 break;
2050         default:
2051                 /* We should never reach this... */
2052                 exit_tryhelp(2);
2053         }
2054
2055         if (verbose > 1)
2056                 dump_entries(*handle);
2057
2058         clear_rule_matches(&matches);
2059
2060         if (e != NULL) {
2061                 free(e);
2062                 e = NULL;
2063         }
2064
2065         free(saddrs);
2066         free(smasks);
2067         free(daddrs);
2068         free(dmasks);
2069         xtables_free_opts(1);
2070
2071         return ret;
2072 }