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iptables: refer to dmesg when we hit error
[jleu-iptables.git] / iptables.c
blobb75df871a4e2092b4b258175450c344f57500db6
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 <stdio.h>
33 #include <stdlib.h>
34 #include <ctype.h>
35 #include <stdarg.h>
36 #include <limits.h>
37 #include <unistd.h>
38 #include <iptables.h>
39 #include <xtables.h>
40 #include <fcntl.h>
41 #include <sys/utsname.h>
42
43 #ifndef TRUE
44 #define TRUE 1
45 #endif
46 #ifndef FALSE
47 #define FALSE 0
48 #endif
49
50 #define FMT_NUMERIC 0x0001
51 #define FMT_NOCOUNTS 0x0002
52 #define FMT_KILOMEGAGIGA 0x0004
53 #define FMT_OPTIONS 0x0008
54 #define FMT_NOTABLE 0x0010
55 #define FMT_NOTARGET 0x0020
56 #define FMT_VIA 0x0040
57 #define FMT_NONEWLINE 0x0080
58 #define FMT_LINENUMBERS 0x0100
59
60 #define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \
61 | FMT_NUMERIC | FMT_NOTABLE)
62 #define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (tab))
63
64
65 #define CMD_NONE 0x0000U
66 #define CMD_INSERT 0x0001U
67 #define CMD_DELETE 0x0002U
68 #define CMD_DELETE_NUM 0x0004U
69 #define CMD_REPLACE 0x0008U
70 #define CMD_APPEND 0x0010U
71 #define CMD_LIST 0x0020U
72 #define CMD_FLUSH 0x0040U
73 #define CMD_ZERO 0x0080U
74 #define CMD_NEW_CHAIN 0x0100U
75 #define CMD_DELETE_CHAIN 0x0200U
76 #define CMD_SET_POLICY 0x0400U
77 #define CMD_RENAME_CHAIN 0x0800U
78 #define CMD_LIST_RULES 0x1000U
79 #define NUMBER_OF_CMD 14
80 static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z',
81 'N', 'X', 'P', 'E', 'S' };
82
83 #define OPTION_OFFSET 256
84
85 #define OPT_NONE 0x00000U
86 #define OPT_NUMERIC 0x00001U
87 #define OPT_SOURCE 0x00002U
88 #define OPT_DESTINATION 0x00004U
89 #define OPT_PROTOCOL 0x00008U
90 #define OPT_JUMP 0x00010U
91 #define OPT_VERBOSE 0x00020U
92 #define OPT_EXPANDED 0x00040U
93 #define OPT_VIANAMEIN 0x00080U
94 #define OPT_VIANAMEOUT 0x00100U
95 #define OPT_FRAGMENT 0x00200U
96 #define OPT_LINENUMBERS 0x00400U
97 #define OPT_COUNTERS 0x00800U
98 #define NUMBER_OF_OPT 12
99 static const char optflags[NUMBER_OF_OPT]
100 = { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', 'f', '0', 'c'};
101
102 static struct option original_opts[] = {
103 {.name = "append", .has_arg = 1, .val = 'A'},
104 {.name = "delete", .has_arg = 1, .val = 'D'},
105 {.name = "insert", .has_arg = 1, .val = 'I'},
106 {.name = "replace", .has_arg = 1, .val = 'R'},
107 {.name = "list", .has_arg = 2, .val = 'L'},
108 {.name = "list-rules", .has_arg = 2, .val = 'S'},
109 {.name = "flush", .has_arg = 2, .val = 'F'},
110 {.name = "zero", .has_arg = 2, .val = 'Z'},
111 {.name = "new-chain", .has_arg = 1, .val = 'N'},
112 {.name = "delete-chain", .has_arg = 2, .val = 'X'},
113 {.name = "rename-chain", .has_arg = 1, .val = 'E'},
114 {.name = "policy", .has_arg = 1, .val = 'P'},
115 {.name = "source", .has_arg = 1, .val = 's'},
116 {.name = "destination", .has_arg = 1, .val = 'd'},
117 {.name = "src", .has_arg = 1, .val = 's'}, /* synonym */
118 {.name = "dst", .has_arg = 1, .val = 'd'}, /* synonym */
119 {.name = "protocol", .has_arg = 1, .val = 'p'},
120 {.name = "in-interface", .has_arg = 1, .val = 'i'},
121 {.name = "jump", .has_arg = 1, .val = 'j'},
122 {.name = "table", .has_arg = 1, .val = 't'},
123 {.name = "match", .has_arg = 1, .val = 'm'},
124 {.name = "numeric", .has_arg = 0, .val = 'n'},
125 {.name = "out-interface", .has_arg = 1, .val = 'o'},
126 {.name = "verbose", .has_arg = 0, .val = 'v'},
127 {.name = "exact", .has_arg = 0, .val = 'x'},
128 {.name = "fragments", .has_arg = 0, .val = 'f'},
129 {.name = "version", .has_arg = 0, .val = 'V'},
130 {.name = "help", .has_arg = 2, .val = 'h'},
131 {.name = "line-numbers", .has_arg = 0, .val = '0'},
132 {.name = "modprobe", .has_arg = 1, .val = 'M'},
133 {.name = "set-counters", .has_arg = 1, .val = 'c'},
134 {.name = "goto", .has_arg = 1, .val = 'g'},
135 {NULL},
136 };
137
138 /* we need this for iptables-restore. iptables-restore.c sets line to the
139 * current line of the input file, in order to give a more precise error
140 * message. iptables itself doesn't need this, so it is initialized to the
141 * magic number of -1 */
142 int line = -1;
143
144 static struct option *opts = original_opts;
145 static unsigned int global_option_offset = 0;
146
147 /* Table of legal combinations of commands and options. If any of the
148 * given commands make an option legal, that option is legal (applies to
149 * CMD_LIST and CMD_ZERO only).
150 * Key:
151 * + compulsory
152 * x illegal
153 * optional
154 */
155
156 static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
157 /* Well, it's better than "Re: Linux vs FreeBSD" */
158 {
159 /* -n -s -d -p -j -v -x -i -o -f --line -c */
160 /*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '},
161 /*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x','x'},
162 /*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x','x'},
163 /*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '},
164 /*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '},
165 /*LIST*/ {' ','x','x','x','x',' ',' ','x','x','x',' ','x'},
166 /*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
167 /*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
168 /*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
169 /*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
170 /*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x','x',' '},
171 /*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
172 /*LIST_RULES*/{'x','x','x','x','x',' ','x','x','x','x','x','x'}
173 };
174
175 static int inverse_for_options[NUMBER_OF_OPT] =
176 {
177 /* -n */ 0,
178 /* -s */ IPT_INV_SRCIP,
179 /* -d */ IPT_INV_DSTIP,
180 /* -p */ IPT_INV_PROTO,
181 /* -j */ 0,
182 /* -v */ 0,
183 /* -x */ 0,
184 /* -i */ IPT_INV_VIA_IN,
185 /* -o */ IPT_INV_VIA_OUT,
186 /* -f */ IPT_INV_FRAG,
187 /*--line*/ 0,
188 /* -c */ 0,
189 };
190
191 const char *program_version;
192 const char *program_name;
193
194 int kernel_version;
195
196 /* A few hardcoded protocols for 'all' and in case the user has no
197 /etc/protocols */
198 struct pprot {
199 char *name;
200 u_int8_t num;
201 };
202
203 struct afinfo afinfo = {
204 .family = NFPROTO_IPV4,
205 .libprefix = "libipt_",
206 .ipproto = IPPROTO_IP,
207 .kmod = "ip_tables",
208 .so_rev_match = IPT_SO_GET_REVISION_MATCH,
209 .so_rev_target = IPT_SO_GET_REVISION_TARGET,
210 };
211
212 /* Primitive headers... */
213 /* defined in netinet/in.h */
214 #if 0
215 #ifndef IPPROTO_ESP
216 #define IPPROTO_ESP 50
217 #endif
218 #ifndef IPPROTO_AH
219 #define IPPROTO_AH 51
220 #endif
221 #endif
222
223 static const struct pprot chain_protos[] = {
224 { "tcp", IPPROTO_TCP },
225 { "udp", IPPROTO_UDP },
226 { "udplite", IPPROTO_UDPLITE },
227 { "icmp", IPPROTO_ICMP },
228 { "esp", IPPROTO_ESP },
229 { "ah", IPPROTO_AH },
230 { "sctp", IPPROTO_SCTP },
231 { "all", 0 },
232 };
233
234 static char *
235 proto_to_name(u_int8_t proto, int nolookup)
236 {
237 unsigned int i;
238
239 if (proto && !nolookup) {
240 struct protoent *pent = getprotobynumber(proto);
241 if (pent)
242 return pent->p_name;
243 }
244
245 for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++)
246 if (chain_protos[i].num == proto)
247 return chain_protos[i].name;
248
249 return NULL;
250 }
251
252 enum {
253 IPT_DOTTED_ADDR = 0,
254 IPT_DOTTED_MASK
255 };
256
257 static void free_opts(int reset_offset)
258 {
259 if (opts != original_opts) {
260 free(opts);
261 opts = original_opts;
262 if (reset_offset)
263 global_option_offset = 0;
264 }
265 }
266
267 static void
268 exit_tryhelp(int status)
269 {
270 if (line != -1)
271 fprintf(stderr, "Error occurred at line: %d\n", line);
272 fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
273 program_name, program_name );
274 free_opts(1);
275 exit(status);
276 }
277
278 static void
279 exit_printhelp(struct iptables_rule_match *matches)
280 {
281 struct iptables_rule_match *matchp = NULL;
282 struct xtables_target *t = NULL;
283
284 printf("%s v%s\n\n"
285 "Usage: %s -[AD] chain rule-specification [options]\n"
286 " %s -[RI] chain rulenum rule-specification [options]\n"
287 " %s -D chain rulenum [options]\n"
288 " %s -[LS] [chain [rulenum]] [options]\n"
289 " %s -[FZ] [chain] [options]\n"
290 " %s -[NX] chain\n"
291 " %s -E old-chain-name new-chain-name\n"
292 " %s -P chain target [options]\n"
293 " %s -h (print this help information)\n\n",
294 program_name, program_version, program_name, program_name,
295 program_name, program_name, program_name, program_name,
296 program_name, program_name, program_name);
297
298 printf(
299 "Commands:\n"
300 "Either long or short options are allowed.\n"
301 " --append -A chain Append to chain\n"
302 " --delete -D chain Delete matching rule from chain\n"
303 " --delete -D chain rulenum\n"
304 " Delete rule rulenum (1 = first) from chain\n"
305 " --insert -I chain [rulenum]\n"
306 " Insert in chain as rulenum (default 1=first)\n"
307 " --replace -R chain rulenum\n"
308 " Replace rule rulenum (1 = first) in chain\n"
309 " --list -L [chain [rulenum]]\n"
310 " List the rules in a chain or all chains\n"
311 " --list-rules -S [chain [rulenum]]\n"
312 " Print the rules in a chain or all chains\n"
313 " --flush -F [chain] Delete all rules in chain or all chains\n"
314 " --zero -Z [chain] Zero counters in chain or all chains\n"
315 " --new -N chain Create a new user-defined chain\n"
316 " --delete-chain\n"
317 " -X [chain] Delete a user-defined chain\n"
318 " --policy -P chain target\n"
319 " Change policy on chain to target\n"
320 " --rename-chain\n"
321 " -E old-chain new-chain\n"
322 " Change chain name, (moving any references)\n"
323
324 "Options:\n"
325 "[!] --proto -p proto protocol: by number or name, eg. `tcp'\n"
326 "[!] --source -s address[/mask]\n"
327 " source specification\n"
328 "[!] --destination -d address[/mask]\n"
329 " destination specification\n"
330 "[!] --in-interface -i input name[+]\n"
331 " network interface name ([+] for wildcard)\n"
332 " --jump -j target\n"
333 " target for rule (may load target extension)\n"
334 #ifdef IPT_F_GOTO
335 " --goto -g chain\n"
336 " jump to chain with no return\n"
337 #endif
338 " --match -m match\n"
339 " extended match (may load extension)\n"
340 " --numeric -n numeric output of addresses and ports\n"
341 "[!] --out-interface -o output name[+]\n"
342 " network interface name ([+] for wildcard)\n"
343 " --table -t table table to manipulate (default: `filter')\n"
344 " --verbose -v verbose mode\n"
345 " --line-numbers print line numbers when listing\n"
346 " --exact -x expand numbers (display exact values)\n"
347 "[!] --fragment -f match second or further fragments only\n"
348 " --modprobe=<command> try to insert modules using this command\n"
349 " --set-counters PKTS BYTES set the counter during insert/append\n"
350 "[!] --version -V print package version.\n");
351
352 /* Print out any special helps. A user might like to be able
353 to add a --help to the commandline, and see expected
354 results. So we call help for all specified matches & targets */
355 for (t = xtables_targets; t ;t = t->next) {
356 if (t->used) {
357 printf("\n");
358 t->help();
359 }
360 }
361 for (matchp = matches; matchp; matchp = matchp->next) {
362 printf("\n");
363 matchp->match->help();
364 }
365 exit(0);
366 }
367
368 void
369 exit_error(enum exittype status, const char *msg, ...)
370 {
371 va_list args;
372
373 va_start(args, msg);
374 fprintf(stderr, "%s v%s: ", program_name, program_version);
375 vfprintf(stderr, msg, args);
376 va_end(args);
377 fprintf(stderr, "\n");
378 if (status == PARAMETER_PROBLEM)
379 exit_tryhelp(status);
380 if (status == VERSION_PROBLEM)
381 fprintf(stderr,
382 "Perhaps iptables or your kernel needs to be upgraded.\n");
383 /* On error paths, make sure that we don't leak memory */
384 free_opts(1);
385 exit(status);
386 }
387
388 static void
389 generic_opt_check(int command, int options)
390 {
391 int i, j, legal = 0;
392
393 /* Check that commands are valid with options. Complicated by the
394 * fact that if an option is legal with *any* command given, it is
395 * legal overall (ie. -z and -l).
396 */
397 for (i = 0; i < NUMBER_OF_OPT; i++) {
398 legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */
399
400 for (j = 0; j < NUMBER_OF_CMD; j++) {
401 if (!(command & (1<<j)))
402 continue;
403
404 if (!(options & (1<<i))) {
405 if (commands_v_options[j][i] == '+')
406 exit_error(PARAMETER_PROBLEM,
407 "You need to supply the `-%c' "
408 "option for this command\n",
409 optflags[i]);
410 } else {
411 if (commands_v_options[j][i] != 'x')
412 legal = 1;
413 else if (legal == 0)
414 legal = -1;
415 }
416 }
417 if (legal == -1)
418 exit_error(PARAMETER_PROBLEM,
419 "Illegal option `-%c' with this command\n",
420 optflags[i]);
421 }
422 }
423
424 static char
425 opt2char(int option)
426 {
427 const char *ptr;
428 for (ptr = optflags; option > 1; option >>= 1, ptr++);
429
430 return *ptr;
431 }
432
433 static char
434 cmd2char(int option)
435 {
436 const char *ptr;
437 for (ptr = cmdflags; option > 1; option >>= 1, ptr++);
438
439 return *ptr;
440 }
441
442 static void
443 add_command(unsigned int *cmd, const int newcmd, const int othercmds,
444 int invert)
445 {
446 if (invert)
447 exit_error(PARAMETER_PROBLEM, "unexpected ! flag");
448 if (*cmd & (~othercmds))
449 exit_error(PARAMETER_PROBLEM, "Can't use -%c with -%c\n",
450 cmd2char(newcmd), cmd2char(*cmd & (~othercmds)));
451 *cmd |= newcmd;
452 }
453
454 int
455 check_inverse(const char option[], int *invert, int *my_optind, int argc)
456 {
457 if (option && strcmp(option, "!") == 0) {
458 if (*invert)
459 exit_error(PARAMETER_PROBLEM,
460 "Multiple `!' flags not allowed");
461 *invert = TRUE;
462 if (my_optind != NULL) {
463 ++*my_optind;
464 if (argc && *my_optind > argc)
465 exit_error(PARAMETER_PROBLEM,
466 "no argument following `!'");
467 }
468
469 return TRUE;
470 }
471 return FALSE;
472 }
473
474 /*
475 * All functions starting with "parse" should succeed, otherwise
476 * the program fails.
477 * Most routines return pointers to static data that may change
478 * between calls to the same or other routines with a few exceptions:
479 * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask"
480 * return global static data.
481 */
482
483 /* Christophe Burki wants `-p 6' to imply `-m tcp'. */
484 static struct xtables_match *
485 find_proto(const char *pname, enum ipt_tryload tryload, int nolookup, struct iptables_rule_match **matches)
486 {
487 unsigned int proto;
488
489 if (string_to_number(pname, 0, 255, &proto) != -1) {
490 char *protoname = proto_to_name(proto, nolookup);
491
492 if (protoname)
493 return find_match(protoname, tryload, matches);
494 } else
495 return find_match(pname, tryload, matches);
496
497 return NULL;
498 }
499
500 u_int16_t
501 parse_protocol(const char *s)
502 {
503 unsigned int proto;
504
505 if (string_to_number(s, 0, 255, &proto) == -1) {
506 struct protoent *pent;
507
508 /* first deal with the special case of 'all' to prevent
509 * people from being able to redefine 'all' in nsswitch
510 * and/or provoke expensive [not working] ldap/nis/...
511 * lookups */
512 if (!strcmp(s, "all"))
513 return 0;
514
515 if ((pent = getprotobyname(s)))
516 proto = pent->p_proto;
517 else {
518 unsigned int i;
519 for (i = 0;
520 i < sizeof(chain_protos)/sizeof(struct pprot);
521 i++) {
522 if (strcmp(s, chain_protos[i].name) == 0) {
523 proto = chain_protos[i].num;
524 break;
525 }
526 }
527 if (i == sizeof(chain_protos)/sizeof(struct pprot))
528 exit_error(PARAMETER_PROBLEM,
529 "unknown protocol `%s' specified",
530 s);
531 }
532 }
533
534 return (u_int16_t)proto;
535 }
536
537 /* Can't be zero. */
538 static int
539 parse_rulenumber(const char *rule)
540 {
541 unsigned int rulenum;
542
543 if (string_to_number(rule, 1, INT_MAX, &rulenum) == -1)
544 exit_error(PARAMETER_PROBLEM,
545 "Invalid rule number `%s'", rule);
546
547 return rulenum;
548 }
549
550 static const char *
551 parse_target(const char *targetname)
552 {
553 const char *ptr;
554
555 if (strlen(targetname) < 1)
556 exit_error(PARAMETER_PROBLEM,
557 "Invalid target name (too short)");
558
559 if (strlen(targetname)+1 > sizeof(ipt_chainlabel))
560 exit_error(PARAMETER_PROBLEM,
561 "Invalid target name `%s' (%u chars max)",
562 targetname, (unsigned int)sizeof(ipt_chainlabel)-1);
563
564 for (ptr = targetname; *ptr; ptr++)
565 if (isspace(*ptr))
566 exit_error(PARAMETER_PROBLEM,
567 "Invalid target name `%s'", targetname);
568 return targetname;
569 }
570
571 static void
572 set_option(unsigned int *options, unsigned int option, u_int8_t *invflg,
573 int invert)
574 {
575 if (*options & option)
576 exit_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed",
577 opt2char(option));
578 *options |= option;
579
580 if (invert) {
581 unsigned int i;
582 for (i = 0; 1 << i != option; i++);
583
584 if (!inverse_for_options[i])
585 exit_error(PARAMETER_PROBLEM,
586 "cannot have ! before -%c",
587 opt2char(option));
588 *invflg |= inverse_for_options[i];
589 }
590 }
591
592 static struct option *
593 merge_options(struct option *oldopts, const struct option *newopts,
594 unsigned int *option_offset)
595 {
596 unsigned int num_old, num_new, i;
597 struct option *merge;
598
599 if (newopts == NULL)
600 return oldopts;
601
602 for (num_old = 0; oldopts[num_old].name; num_old++);
603 for (num_new = 0; newopts[num_new].name; num_new++);
604
605 global_option_offset += OPTION_OFFSET;
606 *option_offset = global_option_offset;
607
608 merge = malloc(sizeof(struct option) * (num_new + num_old + 1));
609 if (merge == NULL)
610 return NULL;
611 memcpy(merge, oldopts, num_old * sizeof(struct option));
612 free_opts(0); /* Release previous options merged if any */
613 for (i = 0; i < num_new; i++) {
614 merge[num_old + i] = newopts[i];
615 merge[num_old + i].val += *option_offset;
616 }
617 memset(merge + num_old + num_new, 0, sizeof(struct option));
618
619 return merge;
620 }
621
622 static void
623 print_num(u_int64_t number, unsigned int format)
624 {
625 if (format & FMT_KILOMEGAGIGA) {
626 if (number > 99999) {
627 number = (number + 500) / 1000;
628 if (number > 9999) {
629 number = (number + 500) / 1000;
630 if (number > 9999) {
631 number = (number + 500) / 1000;
632 if (number > 9999) {
633 number = (number + 500) / 1000;
634 printf(FMT("%4lluT ","%lluT "), (unsigned long long)number);
635 }
636 else printf(FMT("%4lluG ","%lluG "), (unsigned long long)number);
637 }
638 else printf(FMT("%4lluM ","%lluM "), (unsigned long long)number);
639 } else
640 printf(FMT("%4lluK ","%lluK "), (unsigned long long)number);
641 } else
642 printf(FMT("%5llu ","%llu "), (unsigned long long)number);
643 } else
644 printf(FMT("%8llu ","%llu "), (unsigned long long)number);
645 }
646
647
648 static void
649 print_header(unsigned int format, const char *chain, struct iptc_handle *handle)
650 {
651 struct ipt_counters counters;
652 const char *pol = iptc_get_policy(chain, &counters, handle);
653 printf("Chain %s", chain);
654 if (pol) {
655 printf(" (policy %s", pol);
656 if (!(format & FMT_NOCOUNTS)) {
657 fputc(' ', stdout);
658 print_num(counters.pcnt, (format|FMT_NOTABLE));
659 fputs("packets, ", stdout);
660 print_num(counters.bcnt, (format|FMT_NOTABLE));
661 fputs("bytes", stdout);
662 }
663 printf(")\n");
664 } else {
665 unsigned int refs;
666 if (!iptc_get_references(&refs, chain, handle))
667 printf(" (ERROR obtaining refs)\n");
668 else
669 printf(" (%u references)\n", refs);
670 }
671
672 if (format & FMT_LINENUMBERS)
673 printf(FMT("%-4s ", "%s "), "num");
674 if (!(format & FMT_NOCOUNTS)) {
675 if (format & FMT_KILOMEGAGIGA) {
676 printf(FMT("%5s ","%s "), "pkts");
677 printf(FMT("%5s ","%s "), "bytes");
678 } else {
679 printf(FMT("%8s ","%s "), "pkts");
680 printf(FMT("%10s ","%s "), "bytes");
681 }
682 }
683 if (!(format & FMT_NOTARGET))
684 printf(FMT("%-9s ","%s "), "target");
685 fputs(" prot ", stdout);
686 if (format & FMT_OPTIONS)
687 fputs("opt", stdout);
688 if (format & FMT_VIA) {
689 printf(FMT(" %-6s ","%s "), "in");
690 printf(FMT("%-6s ","%s "), "out");
691 }
692 printf(FMT(" %-19s ","%s "), "source");
693 printf(FMT(" %-19s "," %s "), "destination");
694 printf("\n");
695 }
696
697
698 static int
699 print_match(const struct ipt_entry_match *m,
700 const struct ipt_ip *ip,
701 int numeric)
702 {
703 struct xtables_match *match = find_match(m->u.user.name, TRY_LOAD, NULL);
704
705 if (match) {
706 if (match->print)
707 match->print(ip, m, numeric);
708 else
709 printf("%s ", match->name);
710 } else {
711 if (m->u.user.name[0])
712 printf("UNKNOWN match `%s' ", m->u.user.name);
713 }
714 /* Don't stop iterating. */
715 return 0;
716 }
717
718 /* e is called `fw' here for historical reasons */
719 static void
720 print_firewall(const struct ipt_entry *fw,
721 const char *targname,
722 unsigned int num,
723 unsigned int format,
724 struct iptc_handle *const handle)
725 {
726 struct xtables_target *target = NULL;
727 const struct ipt_entry_target *t;
728 u_int8_t flags;
729 char buf[BUFSIZ];
730
731 if (!iptc_is_chain(targname, handle))
732 target = find_target(targname, TRY_LOAD);
733 else
734 target = find_target(IPT_STANDARD_TARGET, LOAD_MUST_SUCCEED);
735
736 t = ipt_get_target((struct ipt_entry *)fw);
737 flags = fw->ip.flags;
738
739 if (format & FMT_LINENUMBERS)
740 printf(FMT("%-4u ", "%u "), num);
741
742 if (!(format & FMT_NOCOUNTS)) {
743 print_num(fw->counters.pcnt, format);
744 print_num(fw->counters.bcnt, format);
745 }
746
747 if (!(format & FMT_NOTARGET))
748 printf(FMT("%-9s ", "%s "), targname);
749
750 fputc(fw->ip.invflags & IPT_INV_PROTO ? '!' : ' ', stdout);
751 {
752 char *pname = proto_to_name(fw->ip.proto, format&FMT_NUMERIC);
753 if (pname)
754 printf(FMT("%-5s", "%s "), pname);
755 else
756 printf(FMT("%-5hu", "%hu "), fw->ip.proto);
757 }
758
759 if (format & FMT_OPTIONS) {
760 if (format & FMT_NOTABLE)
761 fputs("opt ", stdout);
762 fputc(fw->ip.invflags & IPT_INV_FRAG ? '!' : '-', stdout);
763 fputc(flags & IPT_F_FRAG ? 'f' : '-', stdout);
764 fputc(' ', stdout);
765 }
766
767 if (format & FMT_VIA) {
768 char iface[IFNAMSIZ+2];
769
770 if (fw->ip.invflags & IPT_INV_VIA_IN) {
771 iface[0] = '!';
772 iface[1] = '\0';
773 }
774 else iface[0] = '\0';
775
776 if (fw->ip.iniface[0] != '\0') {
777 strcat(iface, fw->ip.iniface);
778 }
779 else if (format & FMT_NUMERIC) strcat(iface, "*");
780 else strcat(iface, "any");
781 printf(FMT(" %-6s ","in %s "), iface);
782
783 if (fw->ip.invflags & IPT_INV_VIA_OUT) {
784 iface[0] = '!';
785 iface[1] = '\0';
786 }
787 else iface[0] = '\0';
788
789 if (fw->ip.outiface[0] != '\0') {
790 strcat(iface, fw->ip.outiface);
791 }
792 else if (format & FMT_NUMERIC) strcat(iface, "*");
793 else strcat(iface, "any");
794 printf(FMT("%-6s ","out %s "), iface);
795 }
796
797 fputc(fw->ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout);
798 if (fw->ip.smsk.s_addr == 0L && !(format & FMT_NUMERIC))
799 printf(FMT("%-19s ","%s "), "anywhere");
800 else {
801 if (format & FMT_NUMERIC)
802 sprintf(buf, "%s", ipaddr_to_numeric(&fw->ip.src));
803 else
804 sprintf(buf, "%s", ipaddr_to_anyname(&fw->ip.src));
805 strcat(buf, ipmask_to_numeric(&fw->ip.smsk));
806 printf(FMT("%-19s ","%s "), buf);
807 }
808
809 fputc(fw->ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout);
810 if (fw->ip.dmsk.s_addr == 0L && !(format & FMT_NUMERIC))
811 printf(FMT("%-19s ","-> %s"), "anywhere");
812 else {
813 if (format & FMT_NUMERIC)
814 sprintf(buf, "%s", ipaddr_to_numeric(&fw->ip.dst));
815 else
816 sprintf(buf, "%s", ipaddr_to_anyname(&fw->ip.dst));
817 strcat(buf, ipmask_to_numeric(&fw->ip.dmsk));
818 printf(FMT("%-19s ","-> %s"), buf);
819 }
820
821 if (format & FMT_NOTABLE)
822 fputs(" ", stdout);
823
824 #ifdef IPT_F_GOTO
825 if(fw->ip.flags & IPT_F_GOTO)
826 printf("[goto] ");
827 #endif
828
829 IPT_MATCH_ITERATE(fw, print_match, &fw->ip, format & FMT_NUMERIC);
830
831 if (target) {
832 if (target->print)
833 /* Print the target information. */
834 target->print(&fw->ip, t, format & FMT_NUMERIC);
835 } else if (t->u.target_size != sizeof(*t))
836 printf("[%u bytes of unknown target data] ",
837 (unsigned int)(t->u.target_size - sizeof(*t)));
838
839 if (!(format & FMT_NONEWLINE))
840 fputc('\n', stdout);
841 }
842
843 static void
844 print_firewall_line(const struct ipt_entry *fw,
845 struct iptc_handle *const h)
846 {
847 struct ipt_entry_target *t;
848
849 t = ipt_get_target((struct ipt_entry *)fw);
850 print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h);
851 }
852
853 static int
854 append_entry(const ipt_chainlabel chain,
855 struct ipt_entry *fw,
856 unsigned int nsaddrs,
857 const struct in_addr saddrs[],
858 unsigned int ndaddrs,
859 const struct in_addr daddrs[],
860 int verbose,
861 struct iptc_handle *handle)
862 {
863 unsigned int i, j;
864 int ret = 1;
865
866 for (i = 0; i < nsaddrs; i++) {
867 fw->ip.src.s_addr = saddrs[i].s_addr;
868 for (j = 0; j < ndaddrs; j++) {
869 fw->ip.dst.s_addr = daddrs[j].s_addr;
870 if (verbose)
871 print_firewall_line(fw, handle);
872 ret &= iptc_append_entry(chain, fw, handle);
873 }
874 }
875
876 return ret;
877 }
878
879 static int
880 replace_entry(const ipt_chainlabel chain,
881 struct ipt_entry *fw,
882 unsigned int rulenum,
883 const struct in_addr *saddr,
884 const struct in_addr *daddr,
885 int verbose,
886 struct iptc_handle *handle)
887 {
888 fw->ip.src.s_addr = saddr->s_addr;
889 fw->ip.dst.s_addr = daddr->s_addr;
890
891 if (verbose)
892 print_firewall_line(fw, handle);
893 return iptc_replace_entry(chain, fw, rulenum, handle);
894 }
895
896 static int
897 insert_entry(const ipt_chainlabel chain,
898 struct ipt_entry *fw,
899 unsigned int rulenum,
900 unsigned int nsaddrs,
901 const struct in_addr saddrs[],
902 unsigned int ndaddrs,
903 const struct in_addr daddrs[],
904 int verbose,
905 struct iptc_handle *handle)
906 {
907 unsigned int i, j;
908 int ret = 1;
909
910 for (i = 0; i < nsaddrs; i++) {
911 fw->ip.src.s_addr = saddrs[i].s_addr;
912 for (j = 0; j < ndaddrs; j++) {
913 fw->ip.dst.s_addr = daddrs[j].s_addr;
914 if (verbose)
915 print_firewall_line(fw, handle);
916 ret &= iptc_insert_entry(chain, fw, rulenum, handle);
917 }
918 }
919
920 return ret;
921 }
922
923 static unsigned char *
924 make_delete_mask(struct ipt_entry *fw, struct iptables_rule_match *matches)
925 {
926 /* Establish mask for comparison */
927 unsigned int size;
928 struct iptables_rule_match *matchp;
929 unsigned char *mask, *mptr;
930
931 size = sizeof(struct ipt_entry);
932 for (matchp = matches; matchp; matchp = matchp->next)
933 size += IPT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size;
934
935 mask = fw_calloc(1, size
936 + IPT_ALIGN(sizeof(struct ipt_entry_target))
937 + xtables_targets->size);
938
939 memset(mask, 0xFF, sizeof(struct ipt_entry));
940 mptr = mask + sizeof(struct ipt_entry);
941
942 for (matchp = matches; matchp; matchp = matchp->next) {
943 memset(mptr, 0xFF,
944 IPT_ALIGN(sizeof(struct ipt_entry_match))
945 + matchp->match->userspacesize);
946 mptr += IPT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size;
947 }
948
949 memset(mptr, 0xFF,
950 IPT_ALIGN(sizeof(struct ipt_entry_target))
951 + xtables_targets->userspacesize);
952
953 return mask;
954 }
955
956 static int
957 delete_entry(const ipt_chainlabel chain,
958 struct ipt_entry *fw,
959 unsigned int nsaddrs,
960 const struct in_addr saddrs[],
961 unsigned int ndaddrs,
962 const struct in_addr daddrs[],
963 int verbose,
964 struct iptc_handle *handle,
965 struct iptables_rule_match *matches)
966 {
967 unsigned int i, j;
968 int ret = 1;
969 unsigned char *mask;
970
971 mask = make_delete_mask(fw, matches);
972 for (i = 0; i < nsaddrs; i++) {
973 fw->ip.src.s_addr = saddrs[i].s_addr;
974 for (j = 0; j < ndaddrs; j++) {
975 fw->ip.dst.s_addr = daddrs[j].s_addr;
976 if (verbose)
977 print_firewall_line(fw, handle);
978 ret &= iptc_delete_entry(chain, fw, mask, handle);
979 }
980 }
981 free(mask);
982
983 return ret;
984 }
985
986 int
987 for_each_chain(int (*fn)(const ipt_chainlabel, int, struct iptc_handle *),
988 int verbose, int builtinstoo, struct iptc_handle *handle)
989 {
990 int ret = 1;
991 const char *chain;
992 char *chains;
993 unsigned int i, chaincount = 0;
994
995 chain = iptc_first_chain(handle);
996 while (chain) {
997 chaincount++;
998 chain = iptc_next_chain(handle);
999 }
1000
1001 chains = fw_malloc(sizeof(ipt_chainlabel) * chaincount);
1002 i = 0;
1003 chain = iptc_first_chain(handle);
1004 while (chain) {
1005 strcpy(chains + i*sizeof(ipt_chainlabel), chain);
1006 i++;
1007 chain = iptc_next_chain(handle);
1008 }
1009
1010 for (i = 0; i < chaincount; i++) {
1011 if (!builtinstoo
1012 && iptc_builtin(chains + i*sizeof(ipt_chainlabel),
1013 handle) == 1)
1014 continue;
1015 ret &= fn(chains + i*sizeof(ipt_chainlabel), verbose, handle);
1016 }
1017
1018 free(chains);
1019 return ret;
1020 }
1021
1022 int
1023 flush_entries(const ipt_chainlabel chain, int verbose,
1024 struct iptc_handle *handle)
1025 {
1026 if (!chain)
1027 return for_each_chain(flush_entries, verbose, 1, handle);
1028
1029 if (verbose)
1030 fprintf(stdout, "Flushing chain `%s'\n", chain);
1031 return iptc_flush_entries(chain, handle);
1032 }
1033
1034 static int
1035 zero_entries(const ipt_chainlabel chain, int verbose,
1036 struct iptc_handle *handle)
1037 {
1038 if (!chain)
1039 return for_each_chain(zero_entries, verbose, 1, handle);
1040
1041 if (verbose)
1042 fprintf(stdout, "Zeroing chain `%s'\n", chain);
1043 return iptc_zero_entries(chain, handle);
1044 }
1045
1046 int
1047 delete_chain(const ipt_chainlabel chain, int verbose,
1048 struct iptc_handle *handle)
1049 {
1050 if (!chain)
1051 return for_each_chain(delete_chain, verbose, 0, handle);
1052
1053 if (verbose)
1054 fprintf(stdout, "Deleting chain `%s'\n", chain);
1055 return iptc_delete_chain(chain, handle);
1056 }
1057
1058 static int
1059 list_entries(const ipt_chainlabel chain, int rulenum, int verbose, int numeric,
1060 int expanded, int linenumbers, struct iptc_handle *handle)
1061 {
1062 int found = 0;
1063 unsigned int format;
1064 const char *this;
1065
1066 format = FMT_OPTIONS;
1067 if (!verbose)
1068 format |= FMT_NOCOUNTS;
1069 else
1070 format |= FMT_VIA;
1071
1072 if (numeric)
1073 format |= FMT_NUMERIC;
1074
1075 if (!expanded)
1076 format |= FMT_KILOMEGAGIGA;
1077
1078 if (linenumbers)
1079 format |= FMT_LINENUMBERS;
1080
1081 for (this = iptc_first_chain(handle);
1082 this;
1083 this = iptc_next_chain(handle)) {
1084 const struct ipt_entry *i;
1085 unsigned int num;
1086
1087 if (chain && strcmp(chain, this) != 0)
1088 continue;
1089
1090 if (found) printf("\n");
1091
1092 if (!rulenum)
1093 print_header(format, this, handle);
1094 i = iptc_first_rule(this, handle);
1095
1096 num = 0;
1097 while (i) {
1098 num++;
1099 if (!rulenum || num == rulenum)
1100 print_firewall(i,
1101 iptc_get_target(i, handle),
1102 num,
1103 format,
1104 handle);
1105 i = iptc_next_rule(i, handle);
1106 }
1107 found = 1;
1108 }
1109
1110 errno = ENOENT;
1111 return found;
1112 }
1113
1114 static void print_proto(u_int16_t proto, int invert)
1115 {
1116 if (proto) {
1117 unsigned int i;
1118 const char *invertstr = invert ? "! " : "";
1119
1120 struct protoent *pent = getprotobynumber(proto);
1121 if (pent) {
1122 printf("-p %s%s ", invertstr, pent->p_name);
1123 return;
1124 }
1125
1126 for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++)
1127 if (chain_protos[i].num == proto) {
1128 printf("-p %s%s ",
1129 invertstr, chain_protos[i].name);
1130 return;
1131 }
1132
1133 printf("-p %s%u ", invertstr, proto);
1134 }
1135 }
1136
1137 #define IP_PARTS_NATIVE(n) \
1138 (unsigned int)((n)>>24)&0xFF, \
1139 (unsigned int)((n)>>16)&0xFF, \
1140 (unsigned int)((n)>>8)&0xFF, \
1141 (unsigned int)((n)&0xFF)
1142
1143 #define IP_PARTS(n) IP_PARTS_NATIVE(ntohl(n))
1144
1145 /* This assumes that mask is contiguous, and byte-bounded. */
1146 static void
1147 print_iface(char letter, const char *iface, const unsigned char *mask,
1148 int invert)
1149 {
1150 unsigned int i;
1151
1152 if (mask[0] == 0)
1153 return;
1154
1155 printf("-%c %s", letter, invert ? "! " : "");
1156
1157 for (i = 0; i < IFNAMSIZ; i++) {
1158 if (mask[i] != 0) {
1159 if (iface[i] != '\0')
1160 printf("%c", iface[i]);
1161 } else {
1162 /* we can access iface[i-1] here, because
1163 * a few lines above we make sure that mask[0] != 0 */
1164 if (iface[i-1] != '\0')
1165 printf("+");
1166 break;
1167 }
1168 }
1169
1170 printf(" ");
1171 }
1172
1173 static int print_match_save(const struct ipt_entry_match *e,
1174 const struct ipt_ip *ip)
1175 {
1176 struct xtables_match *match
1177 = find_match(e->u.user.name, TRY_LOAD, NULL);
1178
1179 if (match) {
1180 printf("-m %s ", e->u.user.name);
1181
1182 /* some matches don't provide a save function */
1183 if (match->save)
1184 match->save(ip, e);
1185 } else {
1186 if (e->u.match_size) {
1187 fprintf(stderr,
1188 "Can't find library for match `%s'\n",
1189 e->u.user.name);
1190 exit(1);
1191 }
1192 }
1193 return 0;
1194 }
1195
1196 /* print a given ip including mask if neccessary */
1197 static void print_ip(char *prefix, u_int32_t ip, u_int32_t mask, int invert)
1198 {
1199 u_int32_t bits, hmask = ntohl(mask);
1200 int i;
1201
1202 if (!mask && !ip && !invert)
1203 return;
1204
1205 printf("%s %s%u.%u.%u.%u",
1206 prefix,
1207 invert ? "! " : "",
1208 IP_PARTS(ip));
1209
1210 if (mask == 0xFFFFFFFFU) {
1211 printf("/32 ");
1212 return;
1213 }
1214
1215 i = 32;
1216 bits = 0xFFFFFFFEU;
1217 while (--i >= 0 && hmask != bits)
1218 bits <<= 1;
1219 if (i >= 0)
1220 printf("/%u ", i);
1221 else
1222 printf("/%u.%u.%u.%u ", IP_PARTS(mask));
1223 }
1224
1225 /* We want this to be readable, so only print out neccessary fields.
1226 * Because that's the kind of world I want to live in. */
1227 void print_rule(const struct ipt_entry *e,
1228 struct iptc_handle *h, const char *chain, int counters)
1229 {
1230 struct ipt_entry_target *t;
1231 const char *target_name;
1232
1233 /* print counters for iptables-save */
1234 if (counters > 0)
1235 printf("[%llu:%llu] ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt);
1236
1237 /* print chain name */
1238 printf("-A %s ", chain);
1239
1240 /* Print IP part. */
1241 print_ip("-s", e->ip.src.s_addr,e->ip.smsk.s_addr,
1242 e->ip.invflags & IPT_INV_SRCIP);
1243
1244 print_ip("-d", e->ip.dst.s_addr, e->ip.dmsk.s_addr,
1245 e->ip.invflags & IPT_INV_DSTIP);
1246
1247 print_iface('i', e->ip.iniface, e->ip.iniface_mask,
1248 e->ip.invflags & IPT_INV_VIA_IN);
1249
1250 print_iface('o', e->ip.outiface, e->ip.outiface_mask,
1251 e->ip.invflags & IPT_INV_VIA_OUT);
1252
1253 print_proto(e->ip.proto, e->ip.invflags & IPT_INV_PROTO);
1254
1255 if (e->ip.flags & IPT_F_FRAG)
1256 printf("%s-f ",
1257 e->ip.invflags & IPT_INV_FRAG ? "! " : "");
1258
1259 /* Print matchinfo part */
1260 if (e->target_offset) {
1261 IPT_MATCH_ITERATE(e, print_match_save, &e->ip);
1262 }
1263
1264 /* print counters for iptables -R */
1265 if (counters < 0)
1266 printf("-c %llu %llu ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt);
1267
1268 /* Print target name */
1269 target_name = iptc_get_target(e, h);
1270 if (target_name && (*target_name != '\0'))
1271 #ifdef IPT_F_GOTO
1272 printf("-%c %s ", e->ip.flags & IPT_F_GOTO ? 'g' : 'j', target_name);
1273 #else
1274 printf("-j %s ", target_name);
1275 #endif
1276
1277 /* Print targinfo part */
1278 t = ipt_get_target((struct ipt_entry *)e);
1279 if (t->u.user.name[0]) {
1280 struct xtables_target *target
1281 = find_target(t->u.user.name, TRY_LOAD);
1282
1283 if (!target) {
1284 fprintf(stderr, "Can't find library for target `%s'\n",
1285 t->u.user.name);
1286 exit(1);
1287 }
1288
1289 if (target->save)
1290 target->save(&e->ip, t);
1291 else {
1292 /* If the target size is greater than ipt_entry_target
1293 * there is something to be saved, we just don't know
1294 * how to print it */
1295 if (t->u.target_size !=
1296 sizeof(struct ipt_entry_target)) {
1297 fprintf(stderr, "Target `%s' is missing "
1298 "save function\n",
1299 t->u.user.name);
1300 exit(1);
1301 }
1302 }
1303 }
1304 printf("\n");
1305 }
1306
1307 static int
1308 list_rules(const ipt_chainlabel chain, int rulenum, int counters,
1309 struct iptc_handle *handle)
1310 {
1311 const char *this = NULL;
1312 int found = 0;
1313
1314 if (counters)
1315 counters = -1; /* iptables -c format */
1316
1317 /* Dump out chain names first,
1318 * thereby preventing dependency conflicts */
1319 if (!rulenum) for (this = iptc_first_chain(handle);
1320 this;
1321 this = iptc_next_chain(handle)) {
1322 if (chain && strcmp(this, chain) != 0)
1323 continue;
1324
1325 if (iptc_builtin(this, handle)) {
1326 struct ipt_counters count;
1327 printf("-P %s %s", this, iptc_get_policy(this, &count, handle));
1328 if (counters)
1329 printf(" -c %llu %llu", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt);
1330 printf("\n");
1331 } else {
1332 printf("-N %s\n", this);
1333 }
1334 }
1335
1336 for (this = iptc_first_chain(handle);
1337 this;
1338 this = iptc_next_chain(handle)) {
1339 const struct ipt_entry *e;
1340 int num = 0;
1341
1342 if (chain && strcmp(this, chain) != 0)
1343 continue;
1344
1345 /* Dump out rules */
1346 e = iptc_first_rule(this, handle);
1347 while(e) {
1348 num++;
1349 if (!rulenum || num == rulenum)
1350 print_rule(e, handle, this, counters);
1351 e = iptc_next_rule(e, handle);
1352 }
1353 found = 1;
1354 }
1355
1356 errno = ENOENT;
1357 return found;
1358 }
1359
1360 static struct ipt_entry *
1361 generate_entry(const struct ipt_entry *fw,
1362 struct iptables_rule_match *matches,
1363 struct ipt_entry_target *target)
1364 {
1365 unsigned int size;
1366 struct iptables_rule_match *matchp;
1367 struct ipt_entry *e;
1368
1369 size = sizeof(struct ipt_entry);
1370 for (matchp = matches; matchp; matchp = matchp->next)
1371 size += matchp->match->m->u.match_size;
1372
1373 e = fw_malloc(size + target->u.target_size);
1374 *e = *fw;
1375 e->target_offset = size;
1376 e->next_offset = size + target->u.target_size;
1377
1378 size = 0;
1379 for (matchp = matches; matchp; matchp = matchp->next) {
1380 memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size);
1381 size += matchp->match->m->u.match_size;
1382 }
1383 memcpy(e->elems + size, target, target->u.target_size);
1384
1385 return e;
1386 }
1387
1388 static void clear_rule_matches(struct iptables_rule_match **matches)
1389 {
1390 struct iptables_rule_match *matchp, *tmp;
1391
1392 for (matchp = *matches; matchp;) {
1393 tmp = matchp->next;
1394 if (matchp->match->m) {
1395 free(matchp->match->m);
1396 matchp->match->m = NULL;
1397 }
1398 if (matchp->match == matchp->match->next) {
1399 free(matchp->match);
1400 matchp->match = NULL;
1401 }
1402 free(matchp);
1403 matchp = tmp;
1404 }
1405
1406 *matches = NULL;
1407 }
1408
1409 static void set_revision(char *name, u_int8_t revision)
1410 {
1411 /* Old kernel sources don't have ".revision" field,
1412 but we stole a byte from name. */
1413 name[IPT_FUNCTION_MAXNAMELEN - 2] = '\0';
1414 name[IPT_FUNCTION_MAXNAMELEN - 1] = revision;
1415 }
1416
1417 void
1418 get_kernel_version(void) {
1419 static struct utsname uts;
1420 int x = 0, y = 0, z = 0;
1421
1422 if (uname(&uts) == -1) {
1423 fprintf(stderr, "Unable to retrieve kernel version.\n");
1424 free_opts(1);
1425 exit(1);
1426 }
1427
1428 sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
1429 kernel_version = LINUX_VERSION(x, y, z);
1430 }
1431
1432 int do_command(int argc, char *argv[], char **table, struct iptc_handle **handle)
1433 {
1434 struct ipt_entry fw, *e = NULL;
1435 int invert = 0;
1436 unsigned int nsaddrs = 0, ndaddrs = 0;
1437 struct in_addr *saddrs = NULL, *daddrs = NULL;
1438
1439 int c, verbose = 0;
1440 const char *chain = NULL;
1441 const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL;
1442 const char *policy = NULL, *newname = NULL;
1443 unsigned int rulenum = 0, options = 0, command = 0;
1444 const char *pcnt = NULL, *bcnt = NULL;
1445 int ret = 1;
1446 struct xtables_match *m;
1447 struct iptables_rule_match *matches = NULL;
1448 struct iptables_rule_match *matchp;
1449 struct xtables_target *target = NULL;
1450 struct xtables_target *t;
1451 const char *jumpto = "";
1452 char *protocol = NULL;
1453 int proto_used = 0;
1454 unsigned long long cnt;
1455
1456 memset(&fw, 0, sizeof(fw));
1457
1458 /* re-set optind to 0 in case do_command gets called
1459 * a second time */
1460 optind = 0;
1461
1462 /* clear mflags in case do_command gets called a second time
1463 * (we clear the global list of all matches for security)*/
1464 for (m = xtables_matches; m; m = m->next)
1465 m->mflags = 0;
1466
1467 for (t = xtables_targets; t; t = t->next) {
1468 t->tflags = 0;
1469 t->used = 0;
1470 }
1471
1472 /* Suppress error messages: we may add new options if we
1473 demand-load a protocol. */
1474 opterr = 0;
1475
1476 while ((c = getopt_long(argc, argv,
1477 "-A:D:R:I:L::S::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:fbvnt:m:xc:g:",
1478 opts, NULL)) != -1) {
1479 switch (c) {
1480 /*
1481 * Command selection
1482 */
1483 case 'A':
1484 add_command(&command, CMD_APPEND, CMD_NONE,
1485 invert);
1486 chain = optarg;
1487 break;
1488
1489 case 'D':
1490 add_command(&command, CMD_DELETE, CMD_NONE,
1491 invert);
1492 chain = optarg;
1493 if (optind < argc && argv[optind][0] != '-'
1494 && argv[optind][0] != '!') {
1495 rulenum = parse_rulenumber(argv[optind++]);
1496 command = CMD_DELETE_NUM;
1497 }
1498 break;
1499
1500 case 'R':
1501 add_command(&command, CMD_REPLACE, CMD_NONE,
1502 invert);
1503 chain = optarg;
1504 if (optind < argc && argv[optind][0] != '-'
1505 && argv[optind][0] != '!')
1506 rulenum = parse_rulenumber(argv[optind++]);
1507 else
1508 exit_error(PARAMETER_PROBLEM,
1509 "-%c requires a rule number",
1510 cmd2char(CMD_REPLACE));
1511 break;
1512
1513 case 'I':
1514 add_command(&command, CMD_INSERT, CMD_NONE,
1515 invert);
1516 chain = optarg;
1517 if (optind < argc && argv[optind][0] != '-'
1518 && argv[optind][0] != '!')
1519 rulenum = parse_rulenumber(argv[optind++]);
1520 else rulenum = 1;
1521 break;
1522
1523 case 'L':
1524 add_command(&command, CMD_LIST, CMD_ZERO,
1525 invert);
1526 if (optarg) chain = optarg;
1527 else if (optind < argc && argv[optind][0] != '-'
1528 && argv[optind][0] != '!')
1529 chain = argv[optind++];
1530 if (optind < argc && argv[optind][0] != '-'
1531 && argv[optind][0] != '!')
1532 rulenum = parse_rulenumber(argv[optind++]);
1533 break;
1534
1535 case 'S':
1536 add_command(&command, CMD_LIST_RULES, CMD_ZERO,
1537 invert);
1538 if (optarg) chain = optarg;
1539 else if (optind < argc && argv[optind][0] != '-'
1540 && argv[optind][0] != '!')
1541 chain = argv[optind++];
1542 if (optind < argc && argv[optind][0] != '-'
1543 && argv[optind][0] != '!')
1544 rulenum = parse_rulenumber(argv[optind++]);
1545 break;
1546
1547 case 'F':
1548 add_command(&command, CMD_FLUSH, CMD_NONE,
1549 invert);
1550 if (optarg) chain = optarg;
1551 else if (optind < argc && argv[optind][0] != '-'
1552 && argv[optind][0] != '!')
1553 chain = argv[optind++];
1554 break;
1555
1556 case 'Z':
1557 add_command(&command, CMD_ZERO, CMD_LIST|CMD_LIST_RULES,
1558 invert);
1559 if (optarg) chain = optarg;
1560 else if (optind < argc && argv[optind][0] != '-'
1561 && argv[optind][0] != '!')
1562 chain = argv[optind++];
1563 break;
1564
1565 case 'N':
1566 if (optarg && (*optarg == '-' || *optarg == '!'))
1567 exit_error(PARAMETER_PROBLEM,
1568 "chain name not allowed to start "
1569 "with `%c'\n", *optarg);
1570 if (find_target(optarg, TRY_LOAD))
1571 exit_error(PARAMETER_PROBLEM,
1572 "chain name may not clash "
1573 "with target name\n");
1574 add_command(&command, CMD_NEW_CHAIN, CMD_NONE,
1575 invert);
1576 chain = optarg;
1577 break;
1578
1579 case 'X':
1580 add_command(&command, CMD_DELETE_CHAIN, CMD_NONE,
1581 invert);
1582 if (optarg) chain = optarg;
1583 else if (optind < argc && argv[optind][0] != '-'
1584 && argv[optind][0] != '!')
1585 chain = argv[optind++];
1586 break;
1587
1588 case 'E':
1589 add_command(&command, CMD_RENAME_CHAIN, CMD_NONE,
1590 invert);
1591 chain = optarg;
1592 if (optind < argc && argv[optind][0] != '-'
1593 && argv[optind][0] != '!')
1594 newname = argv[optind++];
1595 else
1596 exit_error(PARAMETER_PROBLEM,
1597 "-%c requires old-chain-name and "
1598 "new-chain-name",
1599 cmd2char(CMD_RENAME_CHAIN));
1600 break;
1601
1602 case 'P':
1603 add_command(&command, CMD_SET_POLICY, CMD_NONE,
1604 invert);
1605 chain = optarg;
1606 if (optind < argc && argv[optind][0] != '-'
1607 && argv[optind][0] != '!')
1608 policy = argv[optind++];
1609 else
1610 exit_error(PARAMETER_PROBLEM,
1611 "-%c requires a chain and a policy",
1612 cmd2char(CMD_SET_POLICY));
1613 break;
1614
1615 case 'h':
1616 if (!optarg)
1617 optarg = argv[optind];
1618
1619 /* iptables -p icmp -h */
1620 if (!matches && protocol)
1621 find_match(protocol, TRY_LOAD, &matches);
1622
1623 exit_printhelp(matches);
1624
1625 /*
1626 * Option selection
1627 */
1628 case 'p':
1629 check_inverse(optarg, &invert, &optind, argc);
1630 set_option(&options, OPT_PROTOCOL, &fw.ip.invflags,
1631 invert);
1632
1633 /* Canonicalize into lower case */
1634 for (protocol = argv[optind-1]; *protocol; protocol++)
1635 *protocol = tolower(*protocol);
1636
1637 protocol = argv[optind-1];
1638 fw.ip.proto = parse_protocol(protocol);
1639
1640 if (fw.ip.proto == 0
1641 && (fw.ip.invflags & IPT_INV_PROTO))
1642 exit_error(PARAMETER_PROBLEM,
1643 "rule would never match protocol");
1644 break;
1645
1646 case 's':
1647 check_inverse(optarg, &invert, &optind, argc);
1648 set_option(&options, OPT_SOURCE, &fw.ip.invflags,
1649 invert);
1650 shostnetworkmask = argv[optind-1];
1651 break;
1652
1653 case 'd':
1654 check_inverse(optarg, &invert, &optind, argc);
1655 set_option(&options, OPT_DESTINATION, &fw.ip.invflags,
1656 invert);
1657 dhostnetworkmask = argv[optind-1];
1658 break;
1659
1660 #ifdef IPT_F_GOTO
1661 case 'g':
1662 set_option(&options, OPT_JUMP, &fw.ip.invflags,
1663 invert);
1664 fw.ip.flags |= IPT_F_GOTO;
1665 jumpto = parse_target(optarg);
1666 break;
1667 #endif
1668
1669 case 'j':
1670 set_option(&options, OPT_JUMP, &fw.ip.invflags,
1671 invert);
1672 jumpto = parse_target(optarg);
1673 /* TRY_LOAD (may be chain name) */
1674 target = find_target(jumpto, TRY_LOAD);
1675
1676 if (target) {
1677 size_t size;
1678
1679 size = IPT_ALIGN(sizeof(struct ipt_entry_target))
1680 + target->size;
1681
1682 target->t = fw_calloc(1, size);
1683 target->t->u.target_size = size;
1684 strcpy(target->t->u.user.name, jumpto);
1685 set_revision(target->t->u.user.name,
1686 target->revision);
1687 if (target->init != NULL)
1688 target->init(target->t);
1689 opts = merge_options(opts,
1690 target->extra_opts,
1691 &target->option_offset);
1692 if (opts == NULL)
1693 exit_error(OTHER_PROBLEM,
1694 "can't alloc memory!");
1695 }
1696 break;
1697
1698
1699 case 'i':
1700 check_inverse(optarg, &invert, &optind, argc);
1701 set_option(&options, OPT_VIANAMEIN, &fw.ip.invflags,
1702 invert);
1703 parse_interface(argv[optind-1],
1704 fw.ip.iniface,
1705 fw.ip.iniface_mask);
1706 break;
1707
1708 case 'o':
1709 check_inverse(optarg, &invert, &optind, argc);
1710 set_option(&options, OPT_VIANAMEOUT, &fw.ip.invflags,
1711 invert);
1712 parse_interface(argv[optind-1],
1713 fw.ip.outiface,
1714 fw.ip.outiface_mask);
1715 break;
1716
1717 case 'f':
1718 set_option(&options, OPT_FRAGMENT, &fw.ip.invflags,
1719 invert);
1720 fw.ip.flags |= IPT_F_FRAG;
1721 break;
1722
1723 case 'v':
1724 if (!verbose)
1725 set_option(&options, OPT_VERBOSE,
1726 &fw.ip.invflags, invert);
1727 verbose++;
1728 break;
1729
1730 case 'm': {
1731 size_t size;
1732
1733 if (invert)
1734 exit_error(PARAMETER_PROBLEM,
1735 "unexpected ! flag before --match");
1736
1737 m = find_match(optarg, LOAD_MUST_SUCCEED, &matches);
1738 size = IPT_ALIGN(sizeof(struct ipt_entry_match))
1739 + m->size;
1740 m->m = fw_calloc(1, size);
1741 m->m->u.match_size = size;
1742 strcpy(m->m->u.user.name, m->name);
1743 set_revision(m->m->u.user.name, m->revision);
1744 if (m->init != NULL)
1745 m->init(m->m);
1746 if (m != m->next) {
1747 /* Merge options for non-cloned matches */
1748 opts = merge_options(opts,
1749 m->extra_opts,
1750 &m->option_offset);
1751 if (opts == NULL)
1752 exit_error(OTHER_PROBLEM,
1753 "can't alloc memory!");
1754 }
1755 }
1756 break;
1757
1758 case 'n':
1759 set_option(&options, OPT_NUMERIC, &fw.ip.invflags,
1760 invert);
1761 break;
1762
1763 case 't':
1764 if (invert)
1765 exit_error(PARAMETER_PROBLEM,
1766 "unexpected ! flag before --table");
1767 *table = optarg;
1768 break;
1769
1770 case 'x':
1771 set_option(&options, OPT_EXPANDED, &fw.ip.invflags,
1772 invert);
1773 break;
1774
1775 case 'V':
1776 if (invert)
1777 printf("Not %s ;-)\n", program_version);
1778 else
1779 printf("%s v%s\n",
1780 program_name, program_version);
1781 exit(0);
1782
1783 case '0':
1784 set_option(&options, OPT_LINENUMBERS, &fw.ip.invflags,
1785 invert);
1786 break;
1787
1788 case 'M':
1789 modprobe_program = optarg;
1790 break;
1791
1792 case 'c':
1793
1794 set_option(&options, OPT_COUNTERS, &fw.ip.invflags,
1795 invert);
1796 pcnt = optarg;
1797 bcnt = strchr(pcnt + 1, ',');
1798 if (bcnt)
1799 bcnt++;
1800 if (!bcnt && optind < argc && argv[optind][0] != '-'
1801 && argv[optind][0] != '!')
1802 bcnt = argv[optind++];
1803 if (!bcnt)
1804 exit_error(PARAMETER_PROBLEM,
1805 "-%c requires packet and byte counter",
1806 opt2char(OPT_COUNTERS));
1807
1808 if (sscanf(pcnt, "%llu", &cnt) != 1)
1809 exit_error(PARAMETER_PROBLEM,
1810 "-%c packet counter not numeric",
1811 opt2char(OPT_COUNTERS));
1812 fw.counters.pcnt = cnt;
1813
1814 if (sscanf(bcnt, "%llu", &cnt) != 1)
1815 exit_error(PARAMETER_PROBLEM,
1816 "-%c byte counter not numeric",
1817 opt2char(OPT_COUNTERS));
1818 fw.counters.bcnt = cnt;
1819 break;
1820
1821
1822 case 1: /* non option */
1823 if (optarg[0] == '!' && optarg[1] == '\0') {
1824 if (invert)
1825 exit_error(PARAMETER_PROBLEM,
1826 "multiple consecutive ! not"
1827 " allowed");
1828 invert = TRUE;
1829 optarg[0] = '\0';
1830 continue;
1831 }
1832 fprintf(stderr, "Bad argument `%s'\n", optarg);
1833 exit_tryhelp(2);
1834
1835 default:
1836 if (!target
1837 || !(target->parse(c - target->option_offset,
1838 argv, invert,
1839 &target->tflags,
1840 &fw, &target->t))) {
1841 for (matchp = matches; matchp; matchp = matchp->next) {
1842 if (matchp->completed)
1843 continue;
1844 if (matchp->match->parse(c - matchp->match->option_offset,
1845 argv, invert,
1846 &matchp->match->mflags,
1847 &fw,
1848 &matchp->match->m))
1849 break;
1850 }
1851 m = matchp ? matchp->match : NULL;
1852
1853 /* If you listen carefully, you can
1854 actually hear this code suck. */
1855
1856 /* some explanations (after four different bugs
1857 * in 3 different releases): If we encounter a
1858 * parameter, that has not been parsed yet,
1859 * it's not an option of an explicitly loaded
1860 * match or a target. However, we support
1861 * implicit loading of the protocol match
1862 * extension. '-p tcp' means 'l4 proto 6' and
1863 * at the same time 'load tcp protocol match on
1864 * demand if we specify --dport'.
1865 *
1866 * To make this work, we need to make sure:
1867 * - the parameter has not been parsed by
1868 * a match (m above)
1869 * - a protocol has been specified
1870 * - the protocol extension has not been
1871 * loaded yet, or is loaded and unused
1872 * [think of iptables-restore!]
1873 * - the protocol extension can be successively
1874 * loaded
1875 */
1876 if (m == NULL
1877 && protocol
1878 && (!find_proto(protocol, DONT_LOAD,
1879 options&OPT_NUMERIC, NULL)
1880 || (find_proto(protocol, DONT_LOAD,
1881 options&OPT_NUMERIC, NULL)
1882 && (proto_used == 0))
1883 )
1884 && (m = find_proto(protocol, TRY_LOAD,
1885 options&OPT_NUMERIC, &matches))) {
1886 /* Try loading protocol */
1887 size_t size;
1888
1889 proto_used = 1;
1890
1891 size = IPT_ALIGN(sizeof(struct ipt_entry_match))
1892 + m->size;
1893
1894 m->m = fw_calloc(1, size);
1895 m->m->u.match_size = size;
1896 strcpy(m->m->u.user.name, m->name);
1897 set_revision(m->m->u.user.name,
1898 m->revision);
1899 if (m->init != NULL)
1900 m->init(m->m);
1901
1902 opts = merge_options(opts,
1903 m->extra_opts,
1904 &m->option_offset);
1905 if (opts == NULL)
1906 exit_error(OTHER_PROBLEM,
1907 "can't alloc memory!");
1908
1909 optind--;
1910 continue;
1911 }
1912 if (!m) {
1913 if (c == '?') {
1914 if (optopt) {
1915 exit_error(
1916 PARAMETER_PROBLEM,
1917 "option `%s' "
1918 "requires an "
1919 "argument",
1920 argv[optind-1]);
1921 } else {
1922 exit_error(
1923 PARAMETER_PROBLEM,
1924 "unknown option "
1925 "`%s'",
1926 argv[optind-1]);
1927 }
1928 }
1929 exit_error(PARAMETER_PROBLEM,
1930 "Unknown arg `%s'", optarg);
1931 }
1932 }
1933 }
1934 invert = FALSE;
1935 }
1936
1937 if (strcmp(*table, "nat") == 0 &&
1938 ((policy != NULL && strcmp(policy, "DROP") == 0) ||
1939 (jumpto != NULL && strcmp(jumpto, "DROP") == 0)))
1940 fprintf(stderr, "\nThe \"nat\" table is not intended for "
1941 "filtering, hence the use of DROP is deprecated and "
1942 "will permanently be disabled in the next iptables "
1943 "release. Please adjust your scripts.\n\n");
1944
1945 for (matchp = matches; matchp; matchp = matchp->next)
1946 if (matchp->match->final_check != NULL)
1947 matchp->match->final_check(matchp->match->mflags);
1948
1949 if (target != NULL && target->final_check != NULL)
1950 target->final_check(target->tflags);
1951
1952 /* Fix me: must put inverse options checking here --MN */
1953
1954 if (optind < argc)
1955 exit_error(PARAMETER_PROBLEM,
1956 "unknown arguments found on commandline");
1957 if (!command)
1958 exit_error(PARAMETER_PROBLEM, "no command specified");
1959 if (invert)
1960 exit_error(PARAMETER_PROBLEM,
1961 "nothing appropriate following !");
1962
1963 if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND)) {
1964 if (!(options & OPT_DESTINATION))
1965 dhostnetworkmask = "0.0.0.0/0";
1966 if (!(options & OPT_SOURCE))
1967 shostnetworkmask = "0.0.0.0/0";
1968 }
1969
1970 if (shostnetworkmask)
1971 ipparse_hostnetworkmask(shostnetworkmask, &saddrs,
1972 &fw.ip.smsk, &nsaddrs);
1973
1974 if (dhostnetworkmask)
1975 ipparse_hostnetworkmask(dhostnetworkmask, &daddrs,
1976 &fw.ip.dmsk, &ndaddrs);
1977
1978 if ((nsaddrs > 1 || ndaddrs > 1) &&
1979 (fw.ip.invflags & (IPT_INV_SRCIP | IPT_INV_DSTIP)))
1980 exit_error(PARAMETER_PROBLEM, "! not allowed with multiple"
1981 " source or destination IP addresses");
1982
1983 if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1))
1984 exit_error(PARAMETER_PROBLEM, "Replacement rule does not "
1985 "specify a unique address");
1986
1987 generic_opt_check(command, options);
1988
1989 if (chain && strlen(chain) > IPT_FUNCTION_MAXNAMELEN)
1990 exit_error(PARAMETER_PROBLEM,
1991 "chain name `%s' too long (must be under %i chars)",
1992 chain, IPT_FUNCTION_MAXNAMELEN);
1993
1994 /* only allocate handle if we weren't called with a handle */
1995 if (!*handle)
1996 *handle = iptc_init(*table);
1997
1998 /* try to insmod the module if iptc_init failed */
1999 if (!*handle && load_xtables_ko(modprobe_program, 0) != -1)
2000 *handle = iptc_init(*table);
2001
2002 if (!*handle)
2003 exit_error(VERSION_PROBLEM,
2004 "can't initialize iptables table `%s': %s",
2005 *table, iptc_strerror(errno));
2006
2007 if (command == CMD_APPEND
2008 || command == CMD_DELETE
2009 || command == CMD_INSERT
2010 || command == CMD_REPLACE) {
2011 if (strcmp(chain, "PREROUTING") == 0
2012 || strcmp(chain, "INPUT") == 0) {
2013 /* -o not valid with incoming packets. */
2014 if (options & OPT_VIANAMEOUT)
2015 exit_error(PARAMETER_PROBLEM,
2016 "Can't use -%c with %s\n",
2017 opt2char(OPT_VIANAMEOUT),
2018 chain);
2019 }
2020
2021 if (strcmp(chain, "POSTROUTING") == 0
2022 || strcmp(chain, "OUTPUT") == 0) {
2023 /* -i not valid with outgoing packets */
2024 if (options & OPT_VIANAMEIN)
2025 exit_error(PARAMETER_PROBLEM,
2026 "Can't use -%c with %s\n",
2027 opt2char(OPT_VIANAMEIN),
2028 chain);
2029 }
2030
2031 if (target && iptc_is_chain(jumpto, *handle)) {
2032 fprintf(stderr,
2033 "Warning: using chain %s, not extension\n",
2034 jumpto);
2035
2036 if (target->t)
2037 free(target->t);
2038
2039 target = NULL;
2040 }
2041
2042 /* If they didn't specify a target, or it's a chain
2043 name, use standard. */
2044 if (!target
2045 && (strlen(jumpto) == 0
2046 || iptc_is_chain(jumpto, *handle))) {
2047 size_t size;
2048
2049 target = find_target(IPT_STANDARD_TARGET,
2050 LOAD_MUST_SUCCEED);
2051
2052 size = sizeof(struct ipt_entry_target)
2053 + target->size;
2054 target->t = fw_calloc(1, size);
2055 target->t->u.target_size = size;
2056 strcpy(target->t->u.user.name, jumpto);
2057 if (!iptc_is_chain(jumpto, *handle))
2058 set_revision(target->t->u.user.name,
2059 target->revision);
2060 if (target->init != NULL)
2061 target->init(target->t);
2062 }
2063
2064 if (!target) {
2065 /* it is no chain, and we can't load a plugin.
2066 * We cannot know if the plugin is corrupt, non
2067 * existant OR if the user just misspelled a
2068 * chain. */
2069 #ifdef IPT_F_GOTO
2070 if (fw.ip.flags & IPT_F_GOTO)
2071 exit_error(PARAMETER_PROBLEM,
2072 "goto '%s' is not a chain\n", jumpto);
2073 #endif
2074 find_target(jumpto, LOAD_MUST_SUCCEED);
2075 } else {
2076 e = generate_entry(&fw, matches, target->t);
2077 free(target->t);
2078 }
2079 }
2080
2081 switch (command) {
2082 case CMD_APPEND:
2083 ret = append_entry(chain, e,
2084 nsaddrs, saddrs, ndaddrs, daddrs,
2085 options&OPT_VERBOSE,
2086 *handle);
2087 break;
2088 case CMD_DELETE:
2089 ret = delete_entry(chain, e,
2090 nsaddrs, saddrs, ndaddrs, daddrs,
2091 options&OPT_VERBOSE,
2092 *handle, matches);
2093 break;
2094 case CMD_DELETE_NUM:
2095 ret = iptc_delete_num_entry(chain, rulenum - 1, *handle);
2096 break;
2097 case CMD_REPLACE:
2098 ret = replace_entry(chain, e, rulenum - 1,
2099 saddrs, daddrs, options&OPT_VERBOSE,
2100 *handle);
2101 break;
2102 case CMD_INSERT:
2103 ret = insert_entry(chain, e, rulenum - 1,
2104 nsaddrs, saddrs, ndaddrs, daddrs,
2105 options&OPT_VERBOSE,
2106 *handle);
2107 break;
2108 case CMD_FLUSH:
2109 ret = flush_entries(chain, options&OPT_VERBOSE, *handle);
2110 break;
2111 case CMD_ZERO:
2112 ret = zero_entries(chain, options&OPT_VERBOSE, *handle);
2113 break;
2114 case CMD_LIST:
2115 case CMD_LIST|CMD_ZERO:
2116 ret = list_entries(chain,
2117 rulenum,
2118 options&OPT_VERBOSE,
2119 options&OPT_NUMERIC,
2120 options&OPT_EXPANDED,
2121 options&OPT_LINENUMBERS,
2122 *handle);
2123 if (ret && (command & CMD_ZERO))
2124 ret = zero_entries(chain,
2125 options&OPT_VERBOSE, *handle);
2126 break;
2127 case CMD_LIST_RULES:
2128 case CMD_LIST_RULES|CMD_ZERO:
2129 ret = list_rules(chain,
2130 rulenum,
2131 options&OPT_VERBOSE,
2132 *handle);
2133 if (ret && (command & CMD_ZERO))
2134 ret = zero_entries(chain,
2135 options&OPT_VERBOSE, *handle);
2136 break;
2137 case CMD_NEW_CHAIN:
2138 ret = iptc_create_chain(chain, *handle);
2139 break;
2140 case CMD_DELETE_CHAIN:
2141 ret = delete_chain(chain, options&OPT_VERBOSE, *handle);
2142 break;
2143 case CMD_RENAME_CHAIN:
2144 ret = iptc_rename_chain(chain, newname, *handle);
2145 break;
2146 case CMD_SET_POLICY:
2147 ret = iptc_set_policy(chain, policy, options&OPT_COUNTERS ? &fw.counters : NULL, *handle);
2148 break;
2149 default:
2150 /* We should never reach this... */
2151 exit_tryhelp(2);
2152 }
2153
2154 if (verbose > 1)
2155 dump_entries(*handle);
2156
2157 clear_rule_matches(&matches);
2158
2159 if (e != NULL) {
2160 free(e);
2161 e = NULL;
2162 }
2163
2164 free(saddrs);
2165 free(daddrs);
2166 free_opts(1);
2167
2168 return ret;
2169 }
Various project for iptables