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 "xshared.h" 43 44#ifndef TRUE 45#define TRUE 1 46#endif 47#ifndef FALSE 48#define FALSE 0 49#endif 50 51#define CMD_NONE 0x0000U 52#define CMD_INSERT 0x0001U 53#define CMD_DELETE 0x0002U 54#define CMD_DELETE_NUM 0x0004U 55#define CMD_REPLACE 0x0008U 56#define CMD_APPEND 0x0010U 57#define CMD_LIST 0x0020U 58#define CMD_FLUSH 0x0040U 59#define CMD_ZERO 0x0080U 60#define CMD_NEW_CHAIN 0x0100U 61#define CMD_DELETE_CHAIN 0x0200U 62#define CMD_SET_POLICY 0x0400U 63#define CMD_RENAME_CHAIN 0x0800U 64#define CMD_LIST_RULES 0x1000U 65#define CMD_ZERO_NUM 0x2000U 66#define CMD_CHECK 0x4000U 67#define NUMBER_OF_CMD 16 68static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z', 69 'N', 'X', 'P', 'E', 'S', 'Z', 'C' }; 70 71#define OPT_FRAGMENT 0x00800U 72#define NUMBER_OF_OPT ARRAY_SIZE(optflags) 73static const char optflags[] 74= { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', '0', 'c', 'f'}; 75 76static const char unsupported_rev[] = " [unsupported revision]"; 77 78static struct option original_opts[] = { 79 {.name = "append", .has_arg = 1, .val = 'A'}, 80 {.name = "delete", .has_arg = 1, .val = 'D'}, 81 {.name = "check", .has_arg = 1, .val = 'C'}, 82 {.name = "insert", .has_arg = 1, .val = 'I'}, 83 {.name = "replace", .has_arg = 1, .val = 'R'}, 84 {.name = "list", .has_arg = 2, .val = 'L'}, 85 {.name = "list-rules", .has_arg = 2, .val = 'S'}, 86 {.name = "flush", .has_arg = 2, .val = 'F'}, 87 {.name = "zero", .has_arg = 2, .val = 'Z'}, 88 {.name = "new-chain", .has_arg = 1, .val = 'N'}, 89 {.name = "delete-chain", .has_arg = 2, .val = 'X'}, 90 {.name = "rename-chain", .has_arg = 1, .val = 'E'}, 91 {.name = "policy", .has_arg = 1, .val = 'P'}, 92 {.name = "source", .has_arg = 1, .val = 's'}, 93 {.name = "destination", .has_arg = 1, .val = 'd'}, 94 {.name = "src", .has_arg = 1, .val = 's'}, /* synonym */ 95 {.name = "dst", .has_arg = 1, .val = 'd'}, /* synonym */ 96 {.name = "protocol", .has_arg = 1, .val = 'p'}, 97 {.name = "in-interface", .has_arg = 1, .val = 'i'}, 98 {.name = "jump", .has_arg = 1, .val = 'j'}, 99 {.name = "table", .has_arg = 1, .val = 't'}, 100 {.name = "match", .has_arg = 1, .val = 'm'}, 101 {.name = "numeric", .has_arg = 0, .val = 'n'}, 102 {.name = "out-interface", .has_arg = 1, .val = 'o'}, 103 {.name = "verbose", .has_arg = 0, .val = 'v'}, 104 {.name = "wait", .has_arg = 2, .val = 'w'}, 105 {.name = "wait-interval", .has_arg = 2, .val = 'W'}, 106 {.name = "exact", .has_arg = 0, .val = 'x'}, 107 {.name = "fragments", .has_arg = 0, .val = 'f'}, 108 {.name = "version", .has_arg = 0, .val = 'V'}, 109 {.name = "help", .has_arg = 2, .val = 'h'}, 110 {.name = "line-numbers", .has_arg = 0, .val = '0'}, 111 {.name = "modprobe", .has_arg = 1, .val = 'M'}, 112 {.name = "set-counters", .has_arg = 1, .val = 'c'}, 113 {.name = "goto", .has_arg = 1, .val = 'g'}, 114 {.name = "ipv4", .has_arg = 0, .val = '4'}, 115 {.name = "ipv6", .has_arg = 0, .val = '6'}, 116 {NULL}, 117}; 118 119void iptables_exit_error(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3))); 120 121struct xtables_globals iptables_globals = { 122 .option_offset = 0, 123 .program_version = IPTABLES_VERSION, 124 .orig_opts = original_opts, 125 .exit_err = iptables_exit_error, 126 .compat_rev = xtables_compatible_revision, 127}; 128 129/* Table of legal combinations of commands and options. If any of the 130 * given commands make an option legal, that option is legal (applies to 131 * CMD_LIST and CMD_ZERO only). 132 * Key: 133 * + compulsory 134 * x illegal 135 * optional 136 */ 137 138static const char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] = 139/* Well, it's better than "Re: Linux vs FreeBSD" */ 140{ 141 /* -n -s -d -p -j -v -x -i -o --line -c -f */ 142/*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' ',' '}, 143/*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x',' '}, 144/*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x','x'}, 145/*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' ',' '}, 146/*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' ',' '}, 147/*LIST*/ {' ','x','x','x','x',' ',' ','x','x',' ','x','x'}, 148/*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, 149/*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, 150/*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, 151/*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, 152/*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x',' ','x'}, 153/*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, 154/*LIST_RULES*/{'x','x','x','x','x',' ','x','x','x','x','x','x'}, 155/*ZERO_NUM*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, 156/*CHECK*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x',' '}, 157}; 158 159static const int inverse_for_options[NUMBER_OF_OPT] = 160{ 161/* -n */ 0, 162/* -s */ IPT_INV_SRCIP, 163/* -d */ IPT_INV_DSTIP, 164/* -p */ XT_INV_PROTO, 165/* -j */ 0, 166/* -v */ 0, 167/* -x */ 0, 168/* -i */ IPT_INV_VIA_IN, 169/* -o */ IPT_INV_VIA_OUT, 170/*--line*/ 0, 171/* -c */ 0, 172/* -f */ IPT_INV_FRAG, 173}; 174 175#define opts iptables_globals.opts 176#define prog_name iptables_globals.program_name 177#define prog_vers iptables_globals.program_version 178 179static void __attribute__((noreturn)) 180exit_tryhelp(int status) 181{ 182 if (line != -1) 183 fprintf(stderr, "Error occurred at line: %d\n", line); 184 fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n", 185 prog_name, prog_name); 186 xtables_free_opts(1); 187 exit(status); 188} 189 190static void 191exit_printhelp(const struct xtables_rule_match *matches) 192{ 193 printf("%s v%s\n\n" 194"Usage: %s -[ACD] chain rule-specification [options]\n" 195" %s -I chain [rulenum] rule-specification [options]\n" 196" %s -R chain rulenum rule-specification [options]\n" 197" %s -D chain rulenum [options]\n" 198" %s -[LS] [chain [rulenum]] [options]\n" 199" %s -[FZ] [chain] [options]\n" 200" %s -[NX] chain\n" 201" %s -E old-chain-name new-chain-name\n" 202" %s -P chain target [options]\n" 203" %s -h (print this help information)\n\n", 204 prog_name, prog_vers, prog_name, prog_name, 205 prog_name, prog_name, prog_name, prog_name, 206 prog_name, prog_name, prog_name, prog_name); 207 208 printf( 209"Commands:\n" 210"Either long or short options are allowed.\n" 211" --append -A chain Append to chain\n" 212" --check -C chain Check for the existence of a rule\n" 213" --delete -D chain Delete matching rule from chain\n" 214" --delete -D chain rulenum\n" 215" Delete rule rulenum (1 = first) from chain\n" 216" --insert -I chain [rulenum]\n" 217" Insert in chain as rulenum (default 1=first)\n" 218" --replace -R chain rulenum\n" 219" Replace rule rulenum (1 = first) in chain\n" 220" --list -L [chain [rulenum]]\n" 221" List the rules in a chain or all chains\n" 222" --list-rules -S [chain [rulenum]]\n" 223" Print the rules in a chain or all chains\n" 224" --flush -F [chain] Delete all rules in chain or all chains\n" 225" --zero -Z [chain [rulenum]]\n" 226" Zero counters in chain or all chains\n" 227" --new -N chain Create a new user-defined chain\n" 228" --delete-chain\n" 229" -X [chain] Delete a user-defined chain\n" 230" --policy -P chain target\n" 231" Change policy on chain to target\n" 232" --rename-chain\n" 233" -E old-chain new-chain\n" 234" Change chain name, (moving any references)\n" 235 236"Options:\n" 237" --ipv4 -4 Nothing (line is ignored by ip6tables-restore)\n" 238" --ipv6 -6 Error (line is ignored by iptables-restore)\n" 239"[!] --protocol -p proto protocol: by number or name, eg. `tcp'\n" 240"[!] --source -s address[/mask][...]\n" 241" source specification\n" 242"[!] --destination -d address[/mask][...]\n" 243" destination specification\n" 244"[!] --in-interface -i input name[+]\n" 245" network interface name ([+] for wildcard)\n" 246" --jump -j target\n" 247" target for rule (may load target extension)\n" 248#ifdef IPT_F_GOTO 249" --goto -g chain\n" 250" jump to chain with no return\n" 251#endif 252" --match -m match\n" 253" extended match (may load extension)\n" 254" --numeric -n numeric output of addresses and ports\n" 255"[!] --out-interface -o output name[+]\n" 256" network interface name ([+] for wildcard)\n" 257" --table -t table table to manipulate (default: `filter')\n" 258" --verbose -v verbose mode\n" 259" --wait -w [seconds] maximum wait to acquire xtables lock before give up\n" 260" --wait-interval -W [usecs] wait time to try to acquire xtables lock\n" 261" default is 1 second\n" 262" --line-numbers print line numbers when listing\n" 263" --exact -x expand numbers (display exact values)\n" 264"[!] --fragment -f match second or further fragments only\n" 265" --modprobe=<command> try to insert modules using this command\n" 266" --set-counters PKTS BYTES set the counter during insert/append\n" 267"[!] --version -V print package version.\n"); 268 269 print_extension_helps(xtables_targets, matches); 270 exit(0); 271} 272 273void 274iptables_exit_error(enum xtables_exittype status, const char *msg, ...) 275{ 276 va_list args; 277 278 va_start(args, msg); 279 fprintf(stderr, "%s v%s: ", prog_name, prog_vers); 280 vfprintf(stderr, msg, args); 281 va_end(args); 282 fprintf(stderr, "\n"); 283 if (status == PARAMETER_PROBLEM) 284 exit_tryhelp(status); 285 if (status == VERSION_PROBLEM) 286 fprintf(stderr, 287 "Perhaps iptables or your kernel needs to be upgraded.\n"); 288 /* On error paths, make sure that we don't leak memory */ 289 xtables_free_opts(1); 290 exit(status); 291} 292 293static void 294generic_opt_check(int command, int options) 295{ 296 int i, j, legal = 0; 297 298 /* Check that commands are valid with options. Complicated by the 299 * fact that if an option is legal with *any* command given, it is 300 * legal overall (ie. -z and -l). 301 */ 302 for (i = 0; i < NUMBER_OF_OPT; i++) { 303 legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */ 304 305 for (j = 0; j < NUMBER_OF_CMD; j++) { 306 if (!(command & (1<<j))) 307 continue; 308 309 if (!(options & (1<<i))) { 310 if (commands_v_options[j][i] == '+') 311 xtables_error(PARAMETER_PROBLEM, 312 "You need to supply the `-%c' " 313 "option for this command\n", 314 optflags[i]); 315 } else { 316 if (commands_v_options[j][i] != 'x') 317 legal = 1; 318 else if (legal == 0) 319 legal = -1; 320 } 321 } 322 if (legal == -1) 323 xtables_error(PARAMETER_PROBLEM, 324 "Illegal option `-%c' with this command\n", 325 optflags[i]); 326 } 327} 328 329static char 330opt2char(int option) 331{ 332 const char *ptr; 333 for (ptr = optflags; option > 1; option >>= 1, ptr++); 334 335 return *ptr; 336} 337 338static char 339cmd2char(int option) 340{ 341 const char *ptr; 342 for (ptr = cmdflags; option > 1; option >>= 1, ptr++); 343 344 return *ptr; 345} 346 347static void 348add_command(unsigned int *cmd, const int newcmd, const int othercmds, 349 int invert) 350{ 351 if (invert) 352 xtables_error(PARAMETER_PROBLEM, "unexpected ! flag"); 353 if (*cmd & (~othercmds)) 354 xtables_error(PARAMETER_PROBLEM, "Cannot use -%c with -%c\n", 355 cmd2char(newcmd), cmd2char(*cmd & (~othercmds))); 356 *cmd |= newcmd; 357} 358 359/* 360 * All functions starting with "parse" should succeed, otherwise 361 * the program fails. 362 * Most routines return pointers to static data that may change 363 * between calls to the same or other routines with a few exceptions: 364 * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask" 365 * return global static data. 366*/ 367 368/* Christophe Burki wants `-p 6' to imply `-m tcp'. */ 369/* Can't be zero. */ 370static int 371parse_rulenumber(const char *rule) 372{ 373 unsigned int rulenum; 374 375 if (!xtables_strtoui(rule, NULL, &rulenum, 1, INT_MAX)) 376 xtables_error(PARAMETER_PROBLEM, 377 "Invalid rule number `%s'", rule); 378 379 return rulenum; 380} 381 382static void 383parse_chain(const char *chainname) 384{ 385 const char *ptr; 386 387 if (strlen(chainname) >= XT_EXTENSION_MAXNAMELEN) 388 xtables_error(PARAMETER_PROBLEM, 389 "chain name `%s' too long (must be under %u chars)", 390 chainname, XT_EXTENSION_MAXNAMELEN); 391 392 if (*chainname == '-' || *chainname == '!') 393 xtables_error(PARAMETER_PROBLEM, 394 "chain name not allowed to start " 395 "with `%c'\n", *chainname); 396 397 if (xtables_find_target(chainname, XTF_TRY_LOAD)) 398 xtables_error(PARAMETER_PROBLEM, 399 "chain name may not clash " 400 "with target name\n"); 401 402 for (ptr = chainname; *ptr; ptr++) 403 if (isspace(*ptr)) 404 xtables_error(PARAMETER_PROBLEM, 405 "Invalid chain name `%s'", chainname); 406} 407 408static const char * 409parse_target(const char *targetname) 410{ 411 const char *ptr; 412 413 if (strlen(targetname) < 1) 414 xtables_error(PARAMETER_PROBLEM, 415 "Invalid target name (too short)"); 416 417 if (strlen(targetname) >= XT_EXTENSION_MAXNAMELEN) 418 xtables_error(PARAMETER_PROBLEM, 419 "Invalid target name `%s' (%u chars max)", 420 targetname, XT_EXTENSION_MAXNAMELEN - 1); 421 422 for (ptr = targetname; *ptr; ptr++) 423 if (isspace(*ptr)) 424 xtables_error(PARAMETER_PROBLEM, 425 "Invalid target name `%s'", targetname); 426 return targetname; 427} 428 429static void 430set_option(unsigned int *options, unsigned int option, uint8_t *invflg, 431 int invert) 432{ 433 if (*options & option) 434 xtables_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed", 435 opt2char(option)); 436 *options |= option; 437 438 if (invert) { 439 unsigned int i; 440 for (i = 0; 1 << i != option; i++); 441 442 if (!inverse_for_options[i]) 443 xtables_error(PARAMETER_PROBLEM, 444 "cannot have ! before -%c", 445 opt2char(option)); 446 *invflg |= inverse_for_options[i]; 447 } 448} 449 450static void 451print_header(unsigned int format, const char *chain, struct xtc_handle *handle) 452{ 453 struct xt_counters counters; 454 const char *pol = iptc_get_policy(chain, &counters, handle); 455 printf("Chain %s", chain); 456 if (pol) { 457 printf(" (policy %s", pol); 458 if (!(format & FMT_NOCOUNTS)) { 459 fputc(' ', stdout); 460 xtables_print_num(counters.pcnt, (format|FMT_NOTABLE)); 461 fputs("packets, ", stdout); 462 xtables_print_num(counters.bcnt, (format|FMT_NOTABLE)); 463 fputs("bytes", stdout); 464 } 465 printf(")\n"); 466 } else { 467 unsigned int refs; 468 if (!iptc_get_references(&refs, chain, handle)) 469 printf(" (ERROR obtaining refs)\n"); 470 else 471 printf(" (%u references)\n", refs); 472 } 473 474 if (format & FMT_LINENUMBERS) 475 printf(FMT("%-4s ", "%s "), "num"); 476 if (!(format & FMT_NOCOUNTS)) { 477 if (format & FMT_KILOMEGAGIGA) { 478 printf(FMT("%5s ","%s "), "pkts"); 479 printf(FMT("%5s ","%s "), "bytes"); 480 } else { 481 printf(FMT("%8s ","%s "), "pkts"); 482 printf(FMT("%10s ","%s "), "bytes"); 483 } 484 } 485 if (!(format & FMT_NOTARGET)) 486 printf(FMT("%-9s ","%s "), "target"); 487 fputs(" prot ", stdout); 488 if (format & FMT_OPTIONS) 489 fputs("opt", stdout); 490 if (format & FMT_VIA) { 491 printf(FMT(" %-6s ","%s "), "in"); 492 printf(FMT("%-6s ","%s "), "out"); 493 } 494 printf(FMT(" %-19s ","%s "), "source"); 495 printf(FMT(" %-19s "," %s "), "destination"); 496 printf("\n"); 497} 498 499 500static int 501print_match(const struct xt_entry_match *m, 502 const struct ipt_ip *ip, 503 int numeric) 504{ 505 const struct xtables_match *match = 506 xtables_find_match(m->u.user.name, XTF_TRY_LOAD, NULL); 507 508 if (match) { 509 if (match->print && m->u.user.revision == match->revision) 510 match->print(ip, m, numeric); 511 else if (match->print) 512 printf("%s%s ", match->name, unsupported_rev); 513 else 514 printf("%s ", match->name); 515 } else { 516 if (m->u.user.name[0]) 517 printf("UNKNOWN match `%s' ", m->u.user.name); 518 } 519 /* Don't stop iterating. */ 520 return 0; 521} 522 523/* e is called `fw' here for historical reasons */ 524static void 525print_firewall(const struct ipt_entry *fw, 526 const char *targname, 527 unsigned int num, 528 unsigned int format, 529 struct xtc_handle *const handle) 530{ 531 const struct xtables_target *target = NULL; 532 const struct xt_entry_target *t; 533 uint8_t flags; 534 char buf[BUFSIZ]; 535 536 if (!iptc_is_chain(targname, handle)) 537 target = xtables_find_target(targname, XTF_TRY_LOAD); 538 else 539 target = xtables_find_target(XT_STANDARD_TARGET, 540 XTF_LOAD_MUST_SUCCEED); 541 542 t = ipt_get_target((struct ipt_entry *)fw); 543 flags = fw->ip.flags; 544 545 if (format & FMT_LINENUMBERS) 546 printf(FMT("%-4u ", "%u "), num); 547 548 if (!(format & FMT_NOCOUNTS)) { 549 xtables_print_num(fw->counters.pcnt, format); 550 xtables_print_num(fw->counters.bcnt, format); 551 } 552 553 if (!(format & FMT_NOTARGET)) 554 printf(FMT("%-9s ", "%s "), targname); 555 556 fputc(fw->ip.invflags & XT_INV_PROTO ? '!' : ' ', stdout); 557 { 558 const char *pname = proto_to_name(fw->ip.proto, format&FMT_NUMERIC); 559 if (pname) 560 printf(FMT("%-5s", "%s "), pname); 561 else 562 printf(FMT("%-5hu", "%hu "), fw->ip.proto); 563 } 564 565 if (format & FMT_OPTIONS) { 566 if (format & FMT_NOTABLE) 567 fputs("opt ", stdout); 568 fputc(fw->ip.invflags & IPT_INV_FRAG ? '!' : '-', stdout); 569 fputc(flags & IPT_F_FRAG ? 'f' : '-', stdout); 570 fputc(' ', stdout); 571 } 572 573 if (format & FMT_VIA) { 574 char iface[IFNAMSIZ+2]; 575 576 if (fw->ip.invflags & IPT_INV_VIA_IN) { 577 iface[0] = '!'; 578 iface[1] = '\0'; 579 } 580 else iface[0] = '\0'; 581 582 if (fw->ip.iniface[0] != '\0') { 583 strcat(iface, fw->ip.iniface); 584 } 585 else if (format & FMT_NUMERIC) strcat(iface, "*"); 586 else strcat(iface, "any"); 587 printf(FMT(" %-6s ","in %s "), iface); 588 589 if (fw->ip.invflags & IPT_INV_VIA_OUT) { 590 iface[0] = '!'; 591 iface[1] = '\0'; 592 } 593 else iface[0] = '\0'; 594 595 if (fw->ip.outiface[0] != '\0') { 596 strcat(iface, fw->ip.outiface); 597 } 598 else if (format & FMT_NUMERIC) strcat(iface, "*"); 599 else strcat(iface, "any"); 600 printf(FMT("%-6s ","out %s "), iface); 601 } 602 603 fputc(fw->ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout); 604 if (fw->ip.smsk.s_addr == 0L && !(format & FMT_NUMERIC)) 605 printf(FMT("%-19s ","%s "), "anywhere"); 606 else { 607 if (format & FMT_NUMERIC) 608 strcpy(buf, xtables_ipaddr_to_numeric(&fw->ip.src)); 609 else 610 strcpy(buf, xtables_ipaddr_to_anyname(&fw->ip.src)); 611 strcat(buf, xtables_ipmask_to_numeric(&fw->ip.smsk)); 612 printf(FMT("%-19s ","%s "), buf); 613 } 614 615 fputc(fw->ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout); 616 if (fw->ip.dmsk.s_addr == 0L && !(format & FMT_NUMERIC)) 617 printf(FMT("%-19s ","-> %s"), "anywhere"); 618 else { 619 if (format & FMT_NUMERIC) 620 strcpy(buf, xtables_ipaddr_to_numeric(&fw->ip.dst)); 621 else 622 strcpy(buf, xtables_ipaddr_to_anyname(&fw->ip.dst)); 623 strcat(buf, xtables_ipmask_to_numeric(&fw->ip.dmsk)); 624 printf(FMT("%-19s ","-> %s"), buf); 625 } 626 627 if (format & FMT_NOTABLE) 628 fputs(" ", stdout); 629 630#ifdef IPT_F_GOTO 631 if(fw->ip.flags & IPT_F_GOTO) 632 printf("[goto] "); 633#endif 634 635 IPT_MATCH_ITERATE(fw, print_match, &fw->ip, format & FMT_NUMERIC); 636 637 if (target) { 638 if (target->print && t->u.user.revision == target->revision) 639 /* Print the target information. */ 640 target->print(&fw->ip, t, format & FMT_NUMERIC); 641 else if (target->print) 642 printf(" %s%s", target->name, unsupported_rev); 643 } else if (t->u.target_size != sizeof(*t)) 644 printf("[%u bytes of unknown target data] ", 645 (unsigned int)(t->u.target_size - sizeof(*t))); 646 647 if (!(format & FMT_NONEWLINE)) 648 fputc('\n', stdout); 649} 650 651static void 652print_firewall_line(const struct ipt_entry *fw, 653 struct xtc_handle *const h) 654{ 655 struct xt_entry_target *t; 656 657 t = ipt_get_target((struct ipt_entry *)fw); 658 print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h); 659} 660 661static int 662append_entry(const xt_chainlabel chain, 663 struct ipt_entry *fw, 664 unsigned int nsaddrs, 665 const struct in_addr saddrs[], 666 const struct in_addr smasks[], 667 unsigned int ndaddrs, 668 const struct in_addr daddrs[], 669 const struct in_addr dmasks[], 670 int verbose, 671 struct xtc_handle *handle) 672{ 673 unsigned int i, j; 674 int ret = 1; 675 676 for (i = 0; i < nsaddrs; i++) { 677 fw->ip.src.s_addr = saddrs[i].s_addr; 678 fw->ip.smsk.s_addr = smasks[i].s_addr; 679 for (j = 0; j < ndaddrs; j++) { 680 fw->ip.dst.s_addr = daddrs[j].s_addr; 681 fw->ip.dmsk.s_addr = dmasks[j].s_addr; 682 if (verbose) 683 print_firewall_line(fw, handle); 684 ret &= iptc_append_entry(chain, fw, handle); 685 } 686 } 687 688 return ret; 689} 690 691static int 692replace_entry(const xt_chainlabel chain, 693 struct ipt_entry *fw, 694 unsigned int rulenum, 695 const struct in_addr *saddr, const struct in_addr *smask, 696 const struct in_addr *daddr, const struct in_addr *dmask, 697 int verbose, 698 struct xtc_handle *handle) 699{ 700 fw->ip.src.s_addr = saddr->s_addr; 701 fw->ip.dst.s_addr = daddr->s_addr; 702 fw->ip.smsk.s_addr = smask->s_addr; 703 fw->ip.dmsk.s_addr = dmask->s_addr; 704 705 if (verbose) 706 print_firewall_line(fw, handle); 707 return iptc_replace_entry(chain, fw, rulenum, handle); 708} 709 710static int 711insert_entry(const xt_chainlabel chain, 712 struct ipt_entry *fw, 713 unsigned int rulenum, 714 unsigned int nsaddrs, 715 const struct in_addr saddrs[], 716 const struct in_addr smasks[], 717 unsigned int ndaddrs, 718 const struct in_addr daddrs[], 719 const struct in_addr dmasks[], 720 int verbose, 721 struct xtc_handle *handle) 722{ 723 unsigned int i, j; 724 int ret = 1; 725 726 for (i = 0; i < nsaddrs; i++) { 727 fw->ip.src.s_addr = saddrs[i].s_addr; 728 fw->ip.smsk.s_addr = smasks[i].s_addr; 729 for (j = 0; j < ndaddrs; j++) { 730 fw->ip.dst.s_addr = daddrs[j].s_addr; 731 fw->ip.dmsk.s_addr = dmasks[j].s_addr; 732 if (verbose) 733 print_firewall_line(fw, handle); 734 ret &= iptc_insert_entry(chain, fw, rulenum, handle); 735 } 736 } 737 738 return ret; 739} 740 741static unsigned char * 742make_delete_mask(const struct xtables_rule_match *matches, 743 const struct xtables_target *target) 744{ 745 /* Establish mask for comparison */ 746 unsigned int size; 747 const struct xtables_rule_match *matchp; 748 unsigned char *mask, *mptr; 749 750 size = sizeof(struct ipt_entry); 751 for (matchp = matches; matchp; matchp = matchp->next) 752 size += XT_ALIGN(sizeof(struct xt_entry_match)) + matchp->match->size; 753 754 mask = xtables_calloc(1, size 755 + XT_ALIGN(sizeof(struct xt_entry_target)) 756 + target->size); 757 758 memset(mask, 0xFF, sizeof(struct ipt_entry)); 759 mptr = mask + sizeof(struct ipt_entry); 760 761 for (matchp = matches; matchp; matchp = matchp->next) { 762 memset(mptr, 0xFF, 763 XT_ALIGN(sizeof(struct xt_entry_match)) 764 + matchp->match->userspacesize); 765 mptr += XT_ALIGN(sizeof(struct xt_entry_match)) + matchp->match->size; 766 } 767 768 memset(mptr, 0xFF, 769 XT_ALIGN(sizeof(struct xt_entry_target)) 770 + target->userspacesize); 771 772 return mask; 773} 774 775static int 776delete_entry(const xt_chainlabel chain, 777 struct ipt_entry *fw, 778 unsigned int nsaddrs, 779 const struct in_addr saddrs[], 780 const struct in_addr smasks[], 781 unsigned int ndaddrs, 782 const struct in_addr daddrs[], 783 const struct in_addr dmasks[], 784 int verbose, 785 struct xtc_handle *handle, 786 struct xtables_rule_match *matches, 787 const struct xtables_target *target) 788{ 789 unsigned int i, j; 790 int ret = 1; 791 unsigned char *mask; 792 793 mask = make_delete_mask(matches, target); 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_delete_entry(chain, fw, mask, handle); 803 } 804 } 805 free(mask); 806 807 return ret; 808} 809 810static int 811check_entry(const xt_chainlabel chain, struct ipt_entry *fw, 812 unsigned int nsaddrs, const struct in_addr *saddrs, 813 const struct in_addr *smasks, unsigned int ndaddrs, 814 const struct in_addr *daddrs, const struct in_addr *dmasks, 815 bool verbose, struct xtc_handle *handle, 816 struct xtables_rule_match *matches, 817 const struct xtables_target *target) 818{ 819 unsigned int i, j; 820 int ret = 1; 821 unsigned char *mask; 822 823 mask = make_delete_mask(matches, target); 824 for (i = 0; i < nsaddrs; i++) { 825 fw->ip.src.s_addr = saddrs[i].s_addr; 826 fw->ip.smsk.s_addr = smasks[i].s_addr; 827 for (j = 0; j < ndaddrs; j++) { 828 fw->ip.dst.s_addr = daddrs[j].s_addr; 829 fw->ip.dmsk.s_addr = dmasks[j].s_addr; 830 if (verbose) 831 print_firewall_line(fw, handle); 832 ret &= iptc_check_entry(chain, fw, mask, handle); 833 } 834 } 835 836 free(mask); 837 return ret; 838} 839 840int 841for_each_chain4(int (*fn)(const xt_chainlabel, int, struct xtc_handle *), 842 int verbose, int builtinstoo, struct xtc_handle *handle) 843{ 844 int ret = 1; 845 const char *chain; 846 char *chains; 847 unsigned int i, chaincount = 0; 848 849 chain = iptc_first_chain(handle); 850 while (chain) { 851 chaincount++; 852 chain = iptc_next_chain(handle); 853 } 854 855 chains = xtables_malloc(sizeof(xt_chainlabel) * chaincount); 856 i = 0; 857 chain = iptc_first_chain(handle); 858 while (chain) { 859 strcpy(chains + i*sizeof(xt_chainlabel), chain); 860 i++; 861 chain = iptc_next_chain(handle); 862 } 863 864 for (i = 0; i < chaincount; i++) { 865 if (!builtinstoo 866 && iptc_builtin(chains + i*sizeof(xt_chainlabel), 867 handle) == 1) 868 continue; 869 ret &= fn(chains + i*sizeof(xt_chainlabel), verbose, handle); 870 } 871 872 free(chains); 873 return ret; 874} 875 876int 877flush_entries4(const xt_chainlabel chain, int verbose, 878 struct xtc_handle *handle) 879{ 880 if (!chain) 881 return for_each_chain4(flush_entries4, verbose, 1, handle); 882 883 if (verbose) 884 fprintf(stdout, "Flushing chain `%s'\n", chain); 885 return iptc_flush_entries(chain, handle); 886} 887 888static int 889zero_entries(const xt_chainlabel chain, int verbose, 890 struct xtc_handle *handle) 891{ 892 if (!chain) 893 return for_each_chain4(zero_entries, verbose, 1, handle); 894 895 if (verbose) 896 fprintf(stdout, "Zeroing chain `%s'\n", chain); 897 return iptc_zero_entries(chain, handle); 898} 899 900int 901delete_chain4(const xt_chainlabel chain, int verbose, 902 struct xtc_handle *handle) 903{ 904 if (!chain) 905 return for_each_chain4(delete_chain4, verbose, 0, handle); 906 907 if (verbose) 908 fprintf(stdout, "Deleting chain `%s'\n", chain); 909 return iptc_delete_chain(chain, handle); 910} 911 912static int 913list_entries(const xt_chainlabel chain, int rulenum, int verbose, int numeric, 914 int expanded, int linenumbers, struct xtc_handle *handle) 915{ 916 int found = 0; 917 unsigned int format; 918 const char *this; 919 920 format = FMT_OPTIONS; 921 if (!verbose) 922 format |= FMT_NOCOUNTS; 923 else 924 format |= FMT_VIA; 925 926 if (numeric) 927 format |= FMT_NUMERIC; 928 929 if (!expanded) 930 format |= FMT_KILOMEGAGIGA; 931 932 if (linenumbers) 933 format |= FMT_LINENUMBERS; 934 935 for (this = iptc_first_chain(handle); 936 this; 937 this = iptc_next_chain(handle)) { 938 const struct ipt_entry *i; 939 unsigned int num; 940 941 if (chain && strcmp(chain, this) != 0) 942 continue; 943 944 if (found) printf("\n"); 945 946 if (!rulenum) 947 print_header(format, this, handle); 948 i = iptc_first_rule(this, handle); 949 950 num = 0; 951 while (i) { 952 num++; 953 if (!rulenum || num == rulenum) 954 print_firewall(i, 955 iptc_get_target(i, handle), 956 num, 957 format, 958 handle); 959 i = iptc_next_rule(i, handle); 960 } 961 found = 1; 962 } 963 964 errno = ENOENT; 965 return found; 966} 967 968static void print_proto(uint16_t proto, int invert) 969{ 970 if (proto) { 971 unsigned int i; 972 const char *invertstr = invert ? " !" : ""; 973 974 const struct protoent *pent = getprotobynumber(proto); 975 if (pent) { 976 printf("%s -p %s", invertstr, pent->p_name); 977 return; 978 } 979 980 for (i = 0; xtables_chain_protos[i].name != NULL; ++i) 981 if (xtables_chain_protos[i].num == proto) { 982 printf("%s -p %s", 983 invertstr, xtables_chain_protos[i].name); 984 return; 985 } 986 987 printf("%s -p %u", invertstr, proto); 988 } 989} 990 991#define IP_PARTS_NATIVE(n) \ 992(unsigned int)((n)>>24)&0xFF, \ 993(unsigned int)((n)>>16)&0xFF, \ 994(unsigned int)((n)>>8)&0xFF, \ 995(unsigned int)((n)&0xFF) 996 997#define IP_PARTS(n) IP_PARTS_NATIVE(ntohl(n)) 998 999/* This assumes that mask is contiguous, and byte-bounded. */ 1000static void 1001print_iface(char letter, const char *iface, const unsigned char *mask, 1002 int invert) 1003{ 1004 unsigned int i; 1005 1006 if (mask[0] == 0) 1007 return; 1008 1009 printf("%s -%c ", invert ? " !" : "", letter); 1010 1011 for (i = 0; i < IFNAMSIZ; i++) { 1012 if (mask[i] != 0) { 1013 if (iface[i] != '\0') 1014 printf("%c", iface[i]); 1015 } else { 1016 /* we can access iface[i-1] here, because 1017 * a few lines above we make sure that mask[0] != 0 */ 1018 if (iface[i-1] != '\0') 1019 printf("+"); 1020 break; 1021 } 1022 } 1023} 1024 1025static int print_match_save(const struct xt_entry_match *e, 1026 const struct ipt_ip *ip) 1027{ 1028 const struct xtables_match *match = 1029 xtables_find_match(e->u.user.name, XTF_TRY_LOAD, NULL); 1030 1031 if (match) { 1032 printf(" -m %s", 1033 match->alias ? match->alias(e) : e->u.user.name); 1034 1035 /* some matches don't provide a save function */ 1036 if (match->save && e->u.user.revision == match->revision) 1037 match->save(ip, e); 1038 else if (match->save) 1039 printf(unsupported_rev); 1040 } else { 1041 if (e->u.match_size) { 1042 fprintf(stderr, 1043 "Can't find library for match `%s'\n", 1044 e->u.user.name); 1045 exit(1); 1046 } 1047 } 1048 return 0; 1049} 1050 1051/* Print a given ip including mask if necessary. */ 1052static void print_ip(const char *prefix, uint32_t ip, 1053 uint32_t mask, int invert) 1054{ 1055 uint32_t bits, hmask = ntohl(mask); 1056 int i; 1057 1058 if (!mask && !ip && !invert) 1059 return; 1060 1061 printf("%s %s %u.%u.%u.%u", 1062 invert ? " !" : "", 1063 prefix, 1064 IP_PARTS(ip)); 1065 1066 if (mask == 0xFFFFFFFFU) { 1067 printf("/32"); 1068 return; 1069 } 1070 1071 i = 32; 1072 bits = 0xFFFFFFFEU; 1073 while (--i >= 0 && hmask != bits) 1074 bits <<= 1; 1075 if (i >= 0) 1076 printf("/%u", i); 1077 else 1078 printf("/%u.%u.%u.%u", IP_PARTS(mask)); 1079} 1080 1081/* We want this to be readable, so only print out necessary fields. 1082 * Because that's the kind of world I want to live in. 1083 */ 1084void print_rule4(const struct ipt_entry *e, 1085 struct xtc_handle *h, const char *chain, int counters) 1086{ 1087 const struct xt_entry_target *t; 1088 const char *target_name; 1089 1090 /* print counters for iptables-save */ 1091 if (counters > 0) 1092 printf("[%llu:%llu] ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt); 1093 1094 /* print chain name */ 1095 printf("-A %s", chain); 1096 1097 /* Print IP part. */ 1098 print_ip("-s", e->ip.src.s_addr,e->ip.smsk.s_addr, 1099 e->ip.invflags & IPT_INV_SRCIP); 1100 1101 print_ip("-d", e->ip.dst.s_addr, e->ip.dmsk.s_addr, 1102 e->ip.invflags & IPT_INV_DSTIP); 1103 1104 print_iface('i', e->ip.iniface, e->ip.iniface_mask, 1105 e->ip.invflags & IPT_INV_VIA_IN); 1106 1107 print_iface('o', e->ip.outiface, e->ip.outiface_mask, 1108 e->ip.invflags & IPT_INV_VIA_OUT); 1109 1110 print_proto(e->ip.proto, e->ip.invflags & XT_INV_PROTO); 1111 1112 if (e->ip.flags & IPT_F_FRAG) 1113 printf("%s -f", 1114 e->ip.invflags & IPT_INV_FRAG ? " !" : ""); 1115 1116 /* Print matchinfo part */ 1117 if (e->target_offset) { 1118 IPT_MATCH_ITERATE(e, print_match_save, &e->ip); 1119 } 1120 1121 /* print counters for iptables -R */ 1122 if (counters < 0) 1123 printf(" -c %llu %llu", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt); 1124 1125 /* Print target name and targinfo part */ 1126 target_name = iptc_get_target(e, h); 1127 t = ipt_get_target((struct ipt_entry *)e); 1128 if (t->u.user.name[0]) { 1129 const struct xtables_target *target = 1130 xtables_find_target(t->u.user.name, XTF_TRY_LOAD); 1131 1132 if (!target) { 1133 fprintf(stderr, "Can't find library for target `%s'\n", 1134 t->u.user.name); 1135 exit(1); 1136 } 1137 1138 printf(" -j %s", target->alias ? target->alias(t) : target_name); 1139 if (target->save && t->u.user.revision == target->revision) 1140 target->save(&e->ip, t); 1141 else if (target->save) 1142 printf(unsupported_rev); 1143 else { 1144 /* If the target size is greater than xt_entry_target 1145 * there is something to be saved, we just don't know 1146 * how to print it */ 1147 if (t->u.target_size != 1148 sizeof(struct xt_entry_target)) { 1149 fprintf(stderr, "Target `%s' is missing " 1150 "save function\n", 1151 t->u.user.name); 1152 exit(1); 1153 } 1154 } 1155 } else if (target_name && (*target_name != '\0')) 1156#ifdef IPT_F_GOTO 1157 printf(" -%c %s", e->ip.flags & IPT_F_GOTO ? 'g' : 'j', target_name); 1158#else 1159 printf(" -j %s", target_name); 1160#endif 1161 1162 printf("\n"); 1163} 1164 1165static int 1166list_rules(const xt_chainlabel chain, int rulenum, int counters, 1167 struct xtc_handle *handle) 1168{ 1169 const char *this = NULL; 1170 int found = 0; 1171 1172 if (counters) 1173 counters = -1; /* iptables -c format */ 1174 1175 /* Dump out chain names first, 1176 * thereby preventing dependency conflicts */ 1177 if (!rulenum) for (this = iptc_first_chain(handle); 1178 this; 1179 this = iptc_next_chain(handle)) { 1180 if (chain && strcmp(this, chain) != 0) 1181 continue; 1182 1183 if (iptc_builtin(this, handle)) { 1184 struct xt_counters count; 1185 printf("-P %s %s", this, iptc_get_policy(this, &count, handle)); 1186 if (counters) 1187 printf(" -c %llu %llu", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt); 1188 printf("\n"); 1189 } else { 1190 printf("-N %s\n", this); 1191 } 1192 } 1193 1194 for (this = iptc_first_chain(handle); 1195 this; 1196 this = iptc_next_chain(handle)) { 1197 const struct ipt_entry *e; 1198 int num = 0; 1199 1200 if (chain && strcmp(this, chain) != 0) 1201 continue; 1202 1203 /* Dump out rules */ 1204 e = iptc_first_rule(this, handle); 1205 while(e) { 1206 num++; 1207 if (!rulenum || num == rulenum) 1208 print_rule4(e, handle, this, counters); 1209 e = iptc_next_rule(e, handle); 1210 } 1211 found = 1; 1212 } 1213 1214 errno = ENOENT; 1215 return found; 1216} 1217 1218static struct ipt_entry * 1219generate_entry(const struct ipt_entry *fw, 1220 struct xtables_rule_match *matches, 1221 struct xt_entry_target *target) 1222{ 1223 unsigned int size; 1224 struct xtables_rule_match *matchp; 1225 struct ipt_entry *e; 1226 1227 size = sizeof(struct ipt_entry); 1228 for (matchp = matches; matchp; matchp = matchp->next) 1229 size += matchp->match->m->u.match_size; 1230 1231 e = xtables_malloc(size + target->u.target_size); 1232 *e = *fw; 1233 e->target_offset = size; 1234 e->next_offset = size + target->u.target_size; 1235 1236 size = 0; 1237 for (matchp = matches; matchp; matchp = matchp->next) { 1238 memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size); 1239 size += matchp->match->m->u.match_size; 1240 } 1241 memcpy(e->elems + size, target, target->u.target_size); 1242 1243 return e; 1244} 1245 1246static void command_jump(struct iptables_command_state *cs) 1247{ 1248 size_t size; 1249 1250 set_option(&cs->options, OPT_JUMP, &cs->fw.ip.invflags, cs->invert); 1251 cs->jumpto = parse_target(optarg); 1252 /* TRY_LOAD (may be chain name) */ 1253 cs->target = xtables_find_target(cs->jumpto, XTF_TRY_LOAD); 1254 1255 if (cs->target == NULL) 1256 return; 1257 1258 size = XT_ALIGN(sizeof(struct xt_entry_target)) 1259 + cs->target->size; 1260 1261 cs->target->t = xtables_calloc(1, size); 1262 cs->target->t->u.target_size = size; 1263 if (cs->target->real_name == NULL) { 1264 strcpy(cs->target->t->u.user.name, cs->jumpto); 1265 } else { 1266 /* Alias support for userspace side */ 1267 strcpy(cs->target->t->u.user.name, cs->target->real_name); 1268 if (!(cs->target->ext_flags & XTABLES_EXT_ALIAS)) 1269 fprintf(stderr, "Notice: The %s target is converted into %s target " 1270 "in rule listing and saving.\n", 1271 cs->jumpto, cs->target->real_name); 1272 } 1273 cs->target->t->u.user.revision = cs->target->revision; 1274 1275 xs_init_target(cs->target); 1276 1277 if (cs->target->x6_options != NULL) 1278 opts = xtables_options_xfrm(iptables_globals.orig_opts, opts, 1279 cs->target->x6_options, 1280 &cs->target->option_offset); 1281 else 1282 opts = xtables_merge_options(iptables_globals.orig_opts, opts, 1283 cs->target->extra_opts, 1284 &cs->target->option_offset); 1285 if (opts == NULL) 1286 xtables_error(OTHER_PROBLEM, "can't alloc memory!"); 1287} 1288 1289static void command_match(struct iptables_command_state *cs) 1290{ 1291 struct xtables_match *m; 1292 size_t size; 1293 1294 if (cs->invert) 1295 xtables_error(PARAMETER_PROBLEM, 1296 "unexpected ! flag before --match"); 1297 1298 m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, &cs->matches); 1299 size = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size; 1300 m->m = xtables_calloc(1, size); 1301 m->m->u.match_size = size; 1302 if (m->real_name == NULL) { 1303 strcpy(m->m->u.user.name, m->name); 1304 } else { 1305 strcpy(m->m->u.user.name, m->real_name); 1306 if (!(m->ext_flags & XTABLES_EXT_ALIAS)) 1307 fprintf(stderr, "Notice: the %s match is converted into %s match " 1308 "in rule listing and saving.\n", m->name, m->real_name); 1309 } 1310 m->m->u.user.revision = m->revision; 1311 1312 xs_init_match(m); 1313 if (m == m->next) 1314 return; 1315 /* Merge options for non-cloned matches */ 1316 if (m->x6_options != NULL) 1317 opts = xtables_options_xfrm(iptables_globals.orig_opts, opts, 1318 m->x6_options, &m->option_offset); 1319 else if (m->extra_opts != NULL) 1320 opts = xtables_merge_options(iptables_globals.orig_opts, opts, 1321 m->extra_opts, &m->option_offset); 1322 if (opts == NULL) 1323 xtables_error(OTHER_PROBLEM, "can't alloc memory!"); 1324} 1325 1326int do_command4(int argc, char *argv[], char **table, 1327 struct xtc_handle **handle, bool restore) 1328{ 1329 struct iptables_command_state cs; 1330 struct ipt_entry *e = NULL; 1331 unsigned int nsaddrs = 0, ndaddrs = 0; 1332 struct in_addr *saddrs = NULL, *smasks = NULL; 1333 struct in_addr *daddrs = NULL, *dmasks = NULL; 1334 struct timeval wait_interval = { 1335 .tv_sec = 1, 1336 }; 1337 bool wait_interval_set = false; 1338 int verbose = 0; 1339 int wait = 0; 1340 const char *chain = NULL; 1341 const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL; 1342 const char *policy = NULL, *newname = NULL; 1343 unsigned int rulenum = 0, command = 0; 1344 const char *pcnt = NULL, *bcnt = NULL; 1345 int ret = 1; 1346 struct xtables_match *m; 1347 struct xtables_rule_match *matchp; 1348 struct xtables_target *t; 1349 unsigned long long cnt; 1350 1351 memset(&cs, 0, sizeof(cs)); 1352 cs.jumpto = ""; 1353 cs.argv = argv; 1354 1355 /* re-set optind to 0 in case do_command4 gets called 1356 * a second time */ 1357 optind = 0; 1358 1359 /* clear mflags in case do_command4 gets called a second time 1360 * (we clear the global list of all matches for security)*/ 1361 for (m = xtables_matches; m; m = m->next) 1362 m->mflags = 0; 1363 1364 for (t = xtables_targets; t; t = t->next) { 1365 t->tflags = 0; 1366 t->used = 0; 1367 } 1368 1369 /* Suppress error messages: we may add new options if we 1370 demand-load a protocol. */ 1371 opterr = 0; 1372 opts = xt_params->orig_opts; 1373 while ((cs.c = getopt_long(argc, argv, 1374 "-:A:C:D:R:I:L::S::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:fbvw::W::nt:m:xc:g:46", 1375 opts, NULL)) != -1) { 1376 switch (cs.c) { 1377 /* 1378 * Command selection 1379 */ 1380 case 'A': 1381 add_command(&command, CMD_APPEND, CMD_NONE, 1382 cs.invert); 1383 chain = optarg; 1384 break; 1385 1386 case 'C': 1387 add_command(&command, CMD_CHECK, CMD_NONE, 1388 cs.invert); 1389 chain = optarg; 1390 break; 1391 1392 case 'D': 1393 add_command(&command, CMD_DELETE, CMD_NONE, 1394 cs.invert); 1395 chain = optarg; 1396 if (xs_has_arg(argc, argv)) { 1397 rulenum = parse_rulenumber(argv[optind++]); 1398 command = CMD_DELETE_NUM; 1399 } 1400 break; 1401 1402 case 'R': 1403 add_command(&command, CMD_REPLACE, CMD_NONE, 1404 cs.invert); 1405 chain = optarg; 1406 if (xs_has_arg(argc, argv)) 1407 rulenum = parse_rulenumber(argv[optind++]); 1408 else 1409 xtables_error(PARAMETER_PROBLEM, 1410 "-%c requires a rule number", 1411 cmd2char(CMD_REPLACE)); 1412 break; 1413 1414 case 'I': 1415 add_command(&command, CMD_INSERT, CMD_NONE, 1416 cs.invert); 1417 chain = optarg; 1418 if (xs_has_arg(argc, argv)) 1419 rulenum = parse_rulenumber(argv[optind++]); 1420 else rulenum = 1; 1421 break; 1422 1423 case 'L': 1424 add_command(&command, CMD_LIST, 1425 CMD_ZERO | CMD_ZERO_NUM, cs.invert); 1426 if (optarg) chain = optarg; 1427 else if (xs_has_arg(argc, argv)) 1428 chain = argv[optind++]; 1429 if (xs_has_arg(argc, argv)) 1430 rulenum = parse_rulenumber(argv[optind++]); 1431 break; 1432 1433 case 'S': 1434 add_command(&command, CMD_LIST_RULES, 1435 CMD_ZERO|CMD_ZERO_NUM, cs.invert); 1436 if (optarg) chain = optarg; 1437 else if (xs_has_arg(argc, argv)) 1438 chain = argv[optind++]; 1439 if (xs_has_arg(argc, argv)) 1440 rulenum = parse_rulenumber(argv[optind++]); 1441 break; 1442 1443 case 'F': 1444 add_command(&command, CMD_FLUSH, CMD_NONE, 1445 cs.invert); 1446 if (optarg) chain = optarg; 1447 else if (xs_has_arg(argc, argv)) 1448 chain = argv[optind++]; 1449 break; 1450 1451 case 'Z': 1452 add_command(&command, CMD_ZERO, CMD_LIST|CMD_LIST_RULES, 1453 cs.invert); 1454 if (optarg) chain = optarg; 1455 else if (xs_has_arg(argc, argv)) 1456 chain = argv[optind++]; 1457 if (xs_has_arg(argc, argv)) { 1458 rulenum = parse_rulenumber(argv[optind++]); 1459 command = CMD_ZERO_NUM; 1460 } 1461 break; 1462 1463 case 'N': 1464 parse_chain(optarg); 1465 add_command(&command, CMD_NEW_CHAIN, CMD_NONE, 1466 cs.invert); 1467 chain = optarg; 1468 break; 1469 1470 case 'X': 1471 add_command(&command, CMD_DELETE_CHAIN, CMD_NONE, 1472 cs.invert); 1473 if (optarg) chain = optarg; 1474 else if (xs_has_arg(argc, argv)) 1475 chain = argv[optind++]; 1476 break; 1477 1478 case 'E': 1479 add_command(&command, CMD_RENAME_CHAIN, CMD_NONE, 1480 cs.invert); 1481 chain = optarg; 1482 if (xs_has_arg(argc, argv)) 1483 newname = argv[optind++]; 1484 else 1485 xtables_error(PARAMETER_PROBLEM, 1486 "-%c requires old-chain-name and " 1487 "new-chain-name", 1488 cmd2char(CMD_RENAME_CHAIN)); 1489 break; 1490 1491 case 'P': 1492 add_command(&command, CMD_SET_POLICY, CMD_NONE, 1493 cs.invert); 1494 chain = optarg; 1495 if (xs_has_arg(argc, argv)) 1496 policy = argv[optind++]; 1497 else 1498 xtables_error(PARAMETER_PROBLEM, 1499 "-%c requires a chain and a policy", 1500 cmd2char(CMD_SET_POLICY)); 1501 break; 1502 1503 case 'h': 1504 if (!optarg) 1505 optarg = argv[optind]; 1506 1507 /* iptables -p icmp -h */ 1508 if (!cs.matches && cs.protocol) 1509 xtables_find_match(cs.protocol, 1510 XTF_TRY_LOAD, &cs.matches); 1511 1512 exit_printhelp(cs.matches); 1513 1514 /* 1515 * Option selection 1516 */ 1517 case 'p': 1518 set_option(&cs.options, OPT_PROTOCOL, &cs.fw.ip.invflags, 1519 cs.invert); 1520 1521 /* Canonicalize into lower case */ 1522 for (cs.protocol = optarg; *cs.protocol; cs.protocol++) 1523 *cs.protocol = tolower(*cs.protocol); 1524 1525 cs.protocol = optarg; 1526 cs.fw.ip.proto = xtables_parse_protocol(cs.protocol); 1527 1528 if (cs.fw.ip.proto == 0 1529 && (cs.fw.ip.invflags & XT_INV_PROTO)) 1530 xtables_error(PARAMETER_PROBLEM, 1531 "rule would never match protocol"); 1532 break; 1533 1534 case 's': 1535 set_option(&cs.options, OPT_SOURCE, &cs.fw.ip.invflags, 1536 cs.invert); 1537 shostnetworkmask = optarg; 1538 break; 1539 1540 case 'd': 1541 set_option(&cs.options, OPT_DESTINATION, &cs.fw.ip.invflags, 1542 cs.invert); 1543 dhostnetworkmask = optarg; 1544 break; 1545 1546#ifdef IPT_F_GOTO 1547 case 'g': 1548 set_option(&cs.options, OPT_JUMP, &cs.fw.ip.invflags, 1549 cs.invert); 1550 cs.fw.ip.flags |= IPT_F_GOTO; 1551 cs.jumpto = parse_target(optarg); 1552 break; 1553#endif 1554 1555 case 'j': 1556 command_jump(&cs); 1557 break; 1558 1559 1560 case 'i': 1561 if (*optarg == '\0') 1562 xtables_error(PARAMETER_PROBLEM, 1563 "Empty interface is likely to be " 1564 "undesired"); 1565 set_option(&cs.options, OPT_VIANAMEIN, &cs.fw.ip.invflags, 1566 cs.invert); 1567 xtables_parse_interface(optarg, 1568 cs.fw.ip.iniface, 1569 cs.fw.ip.iniface_mask); 1570 break; 1571 1572 case 'o': 1573 if (*optarg == '\0') 1574 xtables_error(PARAMETER_PROBLEM, 1575 "Empty interface is likely to be " 1576 "undesired"); 1577 set_option(&cs.options, OPT_VIANAMEOUT, &cs.fw.ip.invflags, 1578 cs.invert); 1579 xtables_parse_interface(optarg, 1580 cs.fw.ip.outiface, 1581 cs.fw.ip.outiface_mask); 1582 break; 1583 1584 case 'f': 1585 set_option(&cs.options, OPT_FRAGMENT, &cs.fw.ip.invflags, 1586 cs.invert); 1587 cs.fw.ip.flags |= IPT_F_FRAG; 1588 break; 1589 1590 case 'v': 1591 if (!verbose) 1592 set_option(&cs.options, OPT_VERBOSE, 1593 &cs.fw.ip.invflags, cs.invert); 1594 verbose++; 1595 break; 1596 1597 case 'w': 1598 if (restore) { 1599 xtables_error(PARAMETER_PROBLEM, 1600 "You cannot use `-w' from " 1601 "iptables-restore"); 1602 } 1603 wait = parse_wait_time(argc, argv); 1604 break; 1605 1606 case 'W': 1607 if (restore) { 1608 xtables_error(PARAMETER_PROBLEM, 1609 "You cannot use `-W' from " 1610 "iptables-restore"); 1611 } 1612 parse_wait_interval(argc, argv, &wait_interval); 1613 wait_interval_set = true; 1614 break; 1615 1616 case 'm': 1617 command_match(&cs); 1618 break; 1619 1620 case 'n': 1621 set_option(&cs.options, OPT_NUMERIC, &cs.fw.ip.invflags, 1622 cs.invert); 1623 break; 1624 1625 case 't': 1626 if (cs.invert) 1627 xtables_error(PARAMETER_PROBLEM, 1628 "unexpected ! flag before --table"); 1629 *table = optarg; 1630 break; 1631 1632 case 'x': 1633 set_option(&cs.options, OPT_EXPANDED, &cs.fw.ip.invflags, 1634 cs.invert); 1635 break; 1636 1637 case 'V': 1638 if (cs.invert) 1639 printf("Not %s ;-)\n", prog_vers); 1640 else 1641 printf("%s v%s\n", 1642 prog_name, prog_vers); 1643 exit(0); 1644 1645 case '0': 1646 set_option(&cs.options, OPT_LINENUMBERS, &cs.fw.ip.invflags, 1647 cs.invert); 1648 break; 1649 1650 case 'M': 1651 xtables_modprobe_program = optarg; 1652 break; 1653 1654 case 'c': 1655 1656 set_option(&cs.options, OPT_COUNTERS, &cs.fw.ip.invflags, 1657 cs.invert); 1658 pcnt = optarg; 1659 bcnt = strchr(pcnt + 1, ','); 1660 if (bcnt) 1661 bcnt++; 1662 if (!bcnt && xs_has_arg(argc, argv)) 1663 bcnt = argv[optind++]; 1664 if (!bcnt) 1665 xtables_error(PARAMETER_PROBLEM, 1666 "-%c requires packet and byte counter", 1667 opt2char(OPT_COUNTERS)); 1668 1669 if (sscanf(pcnt, "%llu", &cnt) != 1) 1670 xtables_error(PARAMETER_PROBLEM, 1671 "-%c packet counter not numeric", 1672 opt2char(OPT_COUNTERS)); 1673 cs.fw.counters.pcnt = cnt; 1674 1675 if (sscanf(bcnt, "%llu", &cnt) != 1) 1676 xtables_error(PARAMETER_PROBLEM, 1677 "-%c byte counter not numeric", 1678 opt2char(OPT_COUNTERS)); 1679 cs.fw.counters.bcnt = cnt; 1680 break; 1681 1682 case '4': 1683 /* This is indeed the IPv4 iptables */ 1684 break; 1685 1686 case '6': 1687 /* This is not the IPv6 ip6tables */ 1688 if (line != -1) 1689 return 1; /* success: line ignored */ 1690 fprintf(stderr, "This is the IPv4 version of iptables.\n"); 1691 exit_tryhelp(2); 1692 1693 case 1: /* non option */ 1694 if (optarg[0] == '!' && optarg[1] == '\0') { 1695 if (cs.invert) 1696 xtables_error(PARAMETER_PROBLEM, 1697 "multiple consecutive ! not" 1698 " allowed"); 1699 cs.invert = TRUE; 1700 optarg[0] = '\0'; 1701 continue; 1702 } 1703 fprintf(stderr, "Bad argument `%s'\n", optarg); 1704 exit_tryhelp(2); 1705 1706 default: 1707 if (command_default(&cs, &iptables_globals) == 1) 1708 /* cf. ip6tables.c */ 1709 continue; 1710 break; 1711 } 1712 cs.invert = FALSE; 1713 } 1714 1715 if (!wait && wait_interval_set) 1716 xtables_error(PARAMETER_PROBLEM, 1717 "--wait-interval only makes sense with --wait\n"); 1718 1719 if (strcmp(*table, "nat") == 0 && 1720 ((policy != NULL && strcmp(policy, "DROP") == 0) || 1721 (cs.jumpto != NULL && strcmp(cs.jumpto, "DROP") == 0))) 1722 xtables_error(PARAMETER_PROBLEM, 1723 "\nThe \"nat\" table is not intended for filtering, " 1724 "the use of DROP is therefore inhibited.\n\n"); 1725 1726 for (matchp = cs.matches; matchp; matchp = matchp->next) 1727 xtables_option_mfcall(matchp->match); 1728 if (cs.target != NULL) 1729 xtables_option_tfcall(cs.target); 1730 1731 /* Fix me: must put inverse options checking here --MN */ 1732 1733 if (optind < argc) 1734 xtables_error(PARAMETER_PROBLEM, 1735 "unknown arguments found on commandline"); 1736 if (!command) 1737 xtables_error(PARAMETER_PROBLEM, "no command specified"); 1738 if (cs.invert) 1739 xtables_error(PARAMETER_PROBLEM, 1740 "nothing appropriate following !"); 1741 1742 if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND | CMD_CHECK)) { 1743 if (!(cs.options & OPT_DESTINATION)) 1744 dhostnetworkmask = "0.0.0.0/0"; 1745 if (!(cs.options & OPT_SOURCE)) 1746 shostnetworkmask = "0.0.0.0/0"; 1747 } 1748 1749 if (shostnetworkmask) 1750 xtables_ipparse_multiple(shostnetworkmask, &saddrs, 1751 &smasks, &nsaddrs); 1752 1753 if (dhostnetworkmask) 1754 xtables_ipparse_multiple(dhostnetworkmask, &daddrs, 1755 &dmasks, &ndaddrs); 1756 1757 if ((nsaddrs > 1 || ndaddrs > 1) && 1758 (cs.fw.ip.invflags & (IPT_INV_SRCIP | IPT_INV_DSTIP))) 1759 xtables_error(PARAMETER_PROBLEM, "! not allowed with multiple" 1760 " source or destination IP addresses"); 1761 1762 if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1)) 1763 xtables_error(PARAMETER_PROBLEM, "Replacement rule does not " 1764 "specify a unique address"); 1765 1766 generic_opt_check(command, cs.options); 1767 1768 /* Attempt to acquire the xtables lock */ 1769 if (!restore && xtables_lock(wait, &wait_interval) == XT_LOCK_BUSY) { 1770 fprintf(stderr, "Another app is currently holding the xtables lock. "); 1771 if (wait == 0) 1772 fprintf(stderr, "Perhaps you want to use the -w option?\n"); 1773 else 1774 fprintf(stderr, "Stopped waiting after %ds.\n", wait); 1775 xtables_free_opts(1); 1776 exit(RESOURCE_PROBLEM); 1777 } 1778 1779 /* only allocate handle if we weren't called with a handle */ 1780 if (!*handle) 1781 *handle = iptc_init(*table); 1782 1783 /* try to insmod the module if iptc_init failed */ 1784 if (!*handle && xtables_load_ko(xtables_modprobe_program, false) != -1) 1785 *handle = iptc_init(*table); 1786 1787 if (!*handle) 1788 xtables_error(VERSION_PROBLEM, 1789 "can't initialize iptables table `%s': %s", 1790 *table, iptc_strerror(errno)); 1791 1792 if (command == CMD_APPEND 1793 || command == CMD_DELETE 1794 || command == CMD_CHECK 1795 || command == CMD_INSERT 1796 || command == CMD_REPLACE) { 1797 if (strcmp(chain, "PREROUTING") == 0 1798 || strcmp(chain, "INPUT") == 0) { 1799 /* -o not valid with incoming packets. */ 1800 if (cs.options & OPT_VIANAMEOUT) 1801 xtables_error(PARAMETER_PROBLEM, 1802 "Can't use -%c with %s\n", 1803 opt2char(OPT_VIANAMEOUT), 1804 chain); 1805 } 1806 1807 if (strcmp(chain, "POSTROUTING") == 0 1808 || strcmp(chain, "OUTPUT") == 0) { 1809 /* -i not valid with outgoing packets */ 1810 if (cs.options & OPT_VIANAMEIN) 1811 xtables_error(PARAMETER_PROBLEM, 1812 "Can't use -%c with %s\n", 1813 opt2char(OPT_VIANAMEIN), 1814 chain); 1815 } 1816 1817 if (cs.target && iptc_is_chain(cs.jumpto, *handle)) { 1818 fprintf(stderr, 1819 "Warning: using chain %s, not extension\n", 1820 cs.jumpto); 1821 1822 if (cs.target->t) 1823 free(cs.target->t); 1824 1825 cs.target = NULL; 1826 } 1827 1828 /* If they didn't specify a target, or it's a chain 1829 name, use standard. */ 1830 if (!cs.target 1831 && (strlen(cs.jumpto) == 0 1832 || iptc_is_chain(cs.jumpto, *handle))) { 1833 size_t size; 1834 1835 cs.target = xtables_find_target(XT_STANDARD_TARGET, 1836 XTF_LOAD_MUST_SUCCEED); 1837 1838 size = sizeof(struct xt_entry_target) 1839 + cs.target->size; 1840 cs.target->t = xtables_calloc(1, size); 1841 cs.target->t->u.target_size = size; 1842 strcpy(cs.target->t->u.user.name, cs.jumpto); 1843 if (!iptc_is_chain(cs.jumpto, *handle)) 1844 cs.target->t->u.user.revision = cs.target->revision; 1845 xs_init_target(cs.target); 1846 } 1847 1848 if (!cs.target) { 1849 /* It is no chain, and we can't load a plugin. 1850 * We cannot know if the plugin is corrupt, non 1851 * existent OR if the user just misspelled a 1852 * chain. 1853 */ 1854#ifdef IPT_F_GOTO 1855 if (cs.fw.ip.flags & IPT_F_GOTO) 1856 xtables_error(PARAMETER_PROBLEM, 1857 "goto '%s' is not a chain\n", 1858 cs.jumpto); 1859#endif 1860 xtables_find_target(cs.jumpto, XTF_LOAD_MUST_SUCCEED); 1861 } else { 1862 e = generate_entry(&cs.fw, cs.matches, cs.target->t); 1863 free(cs.target->t); 1864 } 1865 } 1866 1867 switch (command) { 1868 case CMD_APPEND: 1869 ret = append_entry(chain, e, 1870 nsaddrs, saddrs, smasks, 1871 ndaddrs, daddrs, dmasks, 1872 cs.options&OPT_VERBOSE, 1873 *handle); 1874 break; 1875 case CMD_DELETE: 1876 ret = delete_entry(chain, e, 1877 nsaddrs, saddrs, smasks, 1878 ndaddrs, daddrs, dmasks, 1879 cs.options&OPT_VERBOSE, 1880 *handle, cs.matches, cs.target); 1881 break; 1882 case CMD_DELETE_NUM: 1883 ret = iptc_delete_num_entry(chain, rulenum - 1, *handle); 1884 break; 1885 case CMD_CHECK: 1886 ret = check_entry(chain, e, 1887 nsaddrs, saddrs, smasks, 1888 ndaddrs, daddrs, dmasks, 1889 cs.options&OPT_VERBOSE, 1890 *handle, cs.matches, cs.target); 1891 break; 1892 case CMD_REPLACE: 1893 ret = replace_entry(chain, e, rulenum - 1, 1894 saddrs, smasks, daddrs, dmasks, 1895 cs.options&OPT_VERBOSE, *handle); 1896 break; 1897 case CMD_INSERT: 1898 ret = insert_entry(chain, e, rulenum - 1, 1899 nsaddrs, saddrs, smasks, 1900 ndaddrs, daddrs, dmasks, 1901 cs.options&OPT_VERBOSE, 1902 *handle); 1903 break; 1904 case CMD_FLUSH: 1905 ret = flush_entries4(chain, cs.options&OPT_VERBOSE, *handle); 1906 break; 1907 case CMD_ZERO: 1908 ret = zero_entries(chain, cs.options&OPT_VERBOSE, *handle); 1909 break; 1910 case CMD_ZERO_NUM: 1911 ret = iptc_zero_counter(chain, rulenum, *handle); 1912 break; 1913 case CMD_LIST: 1914 case CMD_LIST|CMD_ZERO: 1915 case CMD_LIST|CMD_ZERO_NUM: 1916 ret = list_entries(chain, 1917 rulenum, 1918 cs.options&OPT_VERBOSE, 1919 cs.options&OPT_NUMERIC, 1920 cs.options&OPT_EXPANDED, 1921 cs.options&OPT_LINENUMBERS, 1922 *handle); 1923 if (ret && (command & CMD_ZERO)) 1924 ret = zero_entries(chain, 1925 cs.options&OPT_VERBOSE, *handle); 1926 if (ret && (command & CMD_ZERO_NUM)) 1927 ret = iptc_zero_counter(chain, rulenum, *handle); 1928 break; 1929 case CMD_LIST_RULES: 1930 case CMD_LIST_RULES|CMD_ZERO: 1931 case CMD_LIST_RULES|CMD_ZERO_NUM: 1932 ret = list_rules(chain, 1933 rulenum, 1934 cs.options&OPT_VERBOSE, 1935 *handle); 1936 if (ret && (command & CMD_ZERO)) 1937 ret = zero_entries(chain, 1938 cs.options&OPT_VERBOSE, *handle); 1939 if (ret && (command & CMD_ZERO_NUM)) 1940 ret = iptc_zero_counter(chain, rulenum, *handle); 1941 break; 1942 case CMD_NEW_CHAIN: 1943 ret = iptc_create_chain(chain, *handle); 1944 break; 1945 case CMD_DELETE_CHAIN: 1946 ret = delete_chain4(chain, cs.options&OPT_VERBOSE, *handle); 1947 break; 1948 case CMD_RENAME_CHAIN: 1949 ret = iptc_rename_chain(chain, newname, *handle); 1950 break; 1951 case CMD_SET_POLICY: 1952 ret = iptc_set_policy(chain, policy, cs.options&OPT_COUNTERS ? &cs.fw.counters : NULL, *handle); 1953 break; 1954 default: 1955 /* We should never reach this... */ 1956 exit_tryhelp(2); 1957 } 1958 1959 if (verbose > 1) 1960 dump_entries(*handle); 1961 1962 xtables_rule_matches_free(&cs.matches); 1963 1964 if (e != NULL) { 1965 free(e); 1966 e = NULL; 1967 } 1968 1969 free(saddrs); 1970 free(smasks); 1971 free(daddrs); 1972 free(dmasks); 1973 xtables_free_opts(1); 1974 1975 return ret; 1976} 1977