1 /* Code to take an iptables-style command line and do it. */
2
3 /*
4 * Author: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au
5 *
6 * (C) 2000-2002 by the netfilter coreteam <coreteam@netfilter.org>:
7 * Paul 'Rusty' Russell <rusty@rustcorp.com.au>
8 * Marc Boucher <marc+nf@mbsi.ca>
9 * James Morris <jmorris@intercode.com.au>
10 * Harald Welte <laforge@gnumonks.org>
11 * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 */
27
28 #include <getopt.h>
29 #include <string.h>
30 #include <netdb.h>
31 #include <errno.h>
32 #include <stdbool.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <ctype.h>
36 #include <stdarg.h>
37 #include <limits.h>
38 #include <unistd.h>
39 #include <iptables.h>
40 #include <xtables.h>
41 #include <fcntl.h>
42 #include <sys/utsname.h>
43 #include "xshared.h"
44
45 #ifndef TRUE
46 #define TRUE 1
47 #endif
48 #ifndef FALSE
49 #define FALSE 0
50 #endif
51
52 #define FMT_NUMERIC 0x0001
53 #define FMT_NOCOUNTS 0x0002
54 #define FMT_KILOMEGAGIGA 0x0004
55 #define FMT_OPTIONS 0x0008
56 #define FMT_NOTABLE 0x0010
57 #define FMT_NOTARGET 0x0020
58 #define FMT_VIA 0x0040
59 #define FMT_NONEWLINE 0x0080
60 #define FMT_LINENUMBERS 0x0100
61
62 #define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \
63 | FMT_NUMERIC | FMT_NOTABLE)
64 #define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (tab))
65
66
67 #define CMD_NONE 0x0000U
68 #define CMD_INSERT 0x0001U
69 #define CMD_DELETE 0x0002U
70 #define CMD_DELETE_NUM 0x0004U
71 #define CMD_REPLACE 0x0008U
72 #define CMD_APPEND 0x0010U
73 #define CMD_LIST 0x0020U
74 #define CMD_FLUSH 0x0040U
75 #define CMD_ZERO 0x0080U
76 #define CMD_NEW_CHAIN 0x0100U
77 #define CMD_DELETE_CHAIN 0x0200U
78 #define CMD_SET_POLICY 0x0400U
79 #define CMD_RENAME_CHAIN 0x0800U
80 #define CMD_LIST_RULES 0x1000U
81 #define CMD_ZERO_NUM 0x2000U
82 #define CMD_CHECK 0x4000U
83 #define NUMBER_OF_CMD 16
84 static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z',
85 'Z', 'N', 'X', 'P', 'E', 'S', 'C' };
86
87 #define OPT_FRAGMENT 0x00800U
88 #define NUMBER_OF_OPT ARRAY_SIZE(optflags)
89 static const char optflags[]
90 = { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', '0', 'c', 'f'};
91
92 static struct option original_opts[] = {
93 {.name = "append", .has_arg = 1, .val = 'A'},
94 {.name = "delete", .has_arg = 1, .val = 'D'},
95 {.name = "check", .has_arg = 1, .val = 'C'},
96 {.name = "insert", .has_arg = 1, .val = 'I'},
97 {.name = "replace", .has_arg = 1, .val = 'R'},
98 {.name = "list", .has_arg = 2, .val = 'L'},
99 {.name = "list-rules", .has_arg = 2, .val = 'S'},
100 {.name = "flush", .has_arg = 2, .val = 'F'},
101 {.name = "zero", .has_arg = 2, .val = 'Z'},
102 {.name = "new-chain", .has_arg = 1, .val = 'N'},
103 {.name = "delete-chain", .has_arg = 2, .val = 'X'},
104 {.name = "rename-chain", .has_arg = 1, .val = 'E'},
105 {.name = "policy", .has_arg = 1, .val = 'P'},
106 {.name = "source", .has_arg = 1, .val = 's'},
107 {.name = "destination", .has_arg = 1, .val = 'd'},
108 {.name = "src", .has_arg = 1, .val = 's'}, /* synonym */
109 {.name = "dst", .has_arg = 1, .val = 'd'}, /* synonym */
110 {.name = "protocol", .has_arg = 1, .val = 'p'},
111 {.name = "in-interface", .has_arg = 1, .val = 'i'},
112 {.name = "jump", .has_arg = 1, .val = 'j'},
113 {.name = "table", .has_arg = 1, .val = 't'},
114 {.name = "match", .has_arg = 1, .val = 'm'},
115 {.name = "numeric", .has_arg = 0, .val = 'n'},
116 {.name = "out-interface", .has_arg = 1, .val = 'o'},
117 {.name = "verbose", .has_arg = 0, .val = 'v'},
118 {.name = "exact", .has_arg = 0, .val = 'x'},
119 {.name = "fragments", .has_arg = 0, .val = 'f'},
120 {.name = "version", .has_arg = 0, .val = 'V'},
121 {.name = "help", .has_arg = 2, .val = 'h'},
122 {.name = "line-numbers", .has_arg = 0, .val = '0'},
123 {.name = "modprobe", .has_arg = 1, .val = 'M'},
124 {.name = "set-counters", .has_arg = 1, .val = 'c'},
125 {.name = "goto", .has_arg = 1, .val = 'g'},
126 {.name = "ipv4", .has_arg = 0, .val = '4'},
127 {.name = "ipv6", .has_arg = 0, .val = '6'},
128 {NULL},
129 };
130
131 void iptables_exit_error(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3)));
132
133 struct xtables_globals iptables_globals = {
134 .option_offset = 0,
135 .program_version = IPTABLES_VERSION,
136 .orig_opts = original_opts,
137 .exit_err = iptables_exit_error,
138 };
139
140 /* Table of legal combinations of commands and options. If any of the
141 * given commands make an option legal, that option is legal (applies to
142 * CMD_LIST and CMD_ZERO only).
143 * Key:
144 * + compulsory
145 * x illegal
146 * optional
147 */
148
149 static const char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
150 /* Well, it's better than "Re: Linux vs FreeBSD" */
151 {
152 /* -n -s -d -p -j -v -x -i -o --line -c -f */
153 /*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' ',' '},
154 /*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x',' '},
155 /*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x','x'},
156 /*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' ',' '},
157 /*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' ',' '},
158 /*LIST*/ {' ','x','x','x','x',' ',' ','x','x',' ','x','x'},
159 /*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
160 /*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
161 /*ZERO_NUM*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
162 /*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
163 /*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
164 /*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x',' ','x'},
165 /*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
166 /*LIST_RULES*/{'x','x','x','x','x',' ','x','x','x','x','x','x'},
167 /*CHECK*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x',' '},
168 };
169
170 static const int inverse_for_options[NUMBER_OF_OPT] =
171 {
172 /* -n */ 0,
173 /* -s */ IPT_INV_SRCIP,
174 /* -d */ IPT_INV_DSTIP,
175 /* -p */ IPT_INV_PROTO,
176 /* -j */ 0,
177 /* -v */ 0,
178 /* -x */ 0,
179 /* -i */ IPT_INV_VIA_IN,
180 /* -o */ IPT_INV_VIA_OUT,
181 /* -f */ IPT_INV_FRAG,
182 /*--line*/ 0,
183 /* -c */ 0,
184 };
185
186 #define opts iptables_globals.opts
187 #define prog_name iptables_globals.program_name
188 #define prog_vers iptables_globals.program_version
189
190 int kernel_version;
191
192 /* Primitive headers... */
193 /* defined in netinet/in.h */
194 #if 0
195 #ifndef IPPROTO_ESP
196 #define IPPROTO_ESP 50
197 #endif
198 #ifndef IPPROTO_AH
199 #define IPPROTO_AH 51
200 #endif
201 #endif
202
203 enum {
204 IPT_DOTTED_ADDR = 0,
205 IPT_DOTTED_MASK
206 };
207
208 static void __attribute__((noreturn))
exit_tryhelp(int status)209 exit_tryhelp(int status)
210 {
211 if (line != -1)
212 fprintf(stderr, "Error occurred at line: %d\n", line);
213 fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
214 prog_name, prog_name);
215 xtables_free_opts(1);
216 exit(status);
217 }
218
219 static void
exit_printhelp(const struct xtables_rule_match * matches)220 exit_printhelp(const struct xtables_rule_match *matches)
221 {
222 printf("%s v%s\n\n"
223 "Usage: %s -[ACD] chain rule-specification [options]\n"
224 " %s -I chain [rulenum] rule-specification [options]\n"
225 " %s -R chain rulenum rule-specification [options]\n"
226 " %s -D chain rulenum [options]\n"
227 " %s -[LS] [chain [rulenum]] [options]\n"
228 " %s -[FZ] [chain] [options]\n"
229 " %s -[NX] chain\n"
230 " %s -E old-chain-name new-chain-name\n"
231 " %s -P chain target [options]\n"
232 " %s -h (print this help information)\n\n",
233 prog_name, prog_vers, prog_name, prog_name,
234 prog_name, prog_name, prog_name, prog_name,
235 prog_name, prog_name, prog_name, prog_name);
236
237 printf(
238 "Commands:\n"
239 "Either long or short options are allowed.\n"
240 " --append -A chain Append to chain\n"
241 " --check -C chain Check for the existence of a rule\n"
242 " --delete -D chain Delete matching rule from chain\n"
243 " --delete -D chain rulenum\n"
244 " Delete rule rulenum (1 = first) from chain\n"
245 " --insert -I chain [rulenum]\n"
246 " Insert in chain as rulenum (default 1=first)\n"
247 " --replace -R chain rulenum\n"
248 " Replace rule rulenum (1 = first) in chain\n"
249 " --list -L [chain [rulenum]]\n"
250 " List the rules in a chain or all chains\n"
251 " --list-rules -S [chain [rulenum]]\n"
252 " Print the rules in a chain or all chains\n"
253 " --flush -F [chain] Delete all rules in chain or all chains\n"
254 " --zero -Z [chain [rulenum]]\n"
255 " Zero counters in chain or all chains\n"
256 " --new -N chain Create a new user-defined chain\n"
257 " --delete-chain\n"
258 " -X [chain] Delete a user-defined chain\n"
259 " --policy -P chain target\n"
260 " Change policy on chain to target\n"
261 " --rename-chain\n"
262 " -E old-chain new-chain\n"
263 " Change chain name, (moving any references)\n"
264
265 "Options:\n"
266 " --ipv4 -4 Nothing (line is ignored by ip6tables-restore)\n"
267 " --ipv6 -6 Error (line is ignored by iptables-restore)\n"
268 "[!] --proto -p proto protocol: by number or name, eg. `tcp'\n"
269 "[!] --source -s address[/mask][...]\n"
270 " source specification\n"
271 "[!] --destination -d address[/mask][...]\n"
272 " destination specification\n"
273 "[!] --in-interface -i input name[+]\n"
274 " network interface name ([+] for wildcard)\n"
275 " --jump -j target\n"
276 " target for rule (may load target extension)\n"
277 #ifdef IPT_F_GOTO
278 " --goto -g chain\n"
279 " jump to chain with no return\n"
280 #endif
281 " --match -m match\n"
282 " extended match (may load extension)\n"
283 " --numeric -n numeric output of addresses and ports\n"
284 "[!] --out-interface -o output name[+]\n"
285 " network interface name ([+] for wildcard)\n"
286 " --table -t table table to manipulate (default: `filter')\n"
287 " --verbose -v verbose mode\n"
288 " --line-numbers print line numbers when listing\n"
289 " --exact -x expand numbers (display exact values)\n"
290 "[!] --fragment -f match second or further fragments only\n"
291 " --modprobe=<command> try to insert modules using this command\n"
292 " --set-counters PKTS BYTES set the counter during insert/append\n"
293 "[!] --version -V print package version.\n");
294
295 print_extension_helps(xtables_targets, matches);
296 exit(0);
297 }
298
299 void
iptables_exit_error(enum xtables_exittype status,const char * msg,...)300 iptables_exit_error(enum xtables_exittype status, const char *msg, ...)
301 {
302 va_list args;
303
304 va_start(args, msg);
305 fprintf(stderr, "%s v%s: ", prog_name, prog_vers);
306 vfprintf(stderr, msg, args);
307 va_end(args);
308 fprintf(stderr, "\n");
309 if (status == PARAMETER_PROBLEM)
310 exit_tryhelp(status);
311 if (status == VERSION_PROBLEM)
312 fprintf(stderr,
313 "Perhaps iptables or your kernel needs to be upgraded.\n");
314 /* On error paths, make sure that we don't leak memory */
315 xtables_free_opts(1);
316 exit(status);
317 }
318
319 static void
generic_opt_check(int command,int options)320 generic_opt_check(int command, int options)
321 {
322 int i, j, legal = 0;
323
324 /* Check that commands are valid with options. Complicated by the
325 * fact that if an option is legal with *any* command given, it is
326 * legal overall (ie. -z and -l).
327 */
328 for (i = 0; i < NUMBER_OF_OPT; i++) {
329 legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */
330
331 for (j = 0; j < NUMBER_OF_CMD; j++) {
332 if (!(command & (1<<j)))
333 continue;
334
335 if (!(options & (1<<i))) {
336 if (commands_v_options[j][i] == '+')
337 xtables_error(PARAMETER_PROBLEM,
338 "You need to supply the `-%c' "
339 "option for this command\n",
340 optflags[i]);
341 } else {
342 if (commands_v_options[j][i] != 'x')
343 legal = 1;
344 else if (legal == 0)
345 legal = -1;
346 }
347 }
348 if (legal == -1)
349 xtables_error(PARAMETER_PROBLEM,
350 "Illegal option `-%c' with this command\n",
351 optflags[i]);
352 }
353 }
354
355 static char
opt2char(int option)356 opt2char(int option)
357 {
358 const char *ptr;
359 for (ptr = optflags; option > 1; option >>= 1, ptr++);
360
361 return *ptr;
362 }
363
364 static char
cmd2char(int option)365 cmd2char(int option)
366 {
367 const char *ptr;
368 for (ptr = cmdflags; option > 1; option >>= 1, ptr++);
369
370 return *ptr;
371 }
372
373 static void
add_command(unsigned int * cmd,const int newcmd,const int othercmds,int invert)374 add_command(unsigned int *cmd, const int newcmd, const int othercmds,
375 int invert)
376 {
377 if (invert)
378 xtables_error(PARAMETER_PROBLEM, "unexpected ! flag");
379 if (*cmd & (~othercmds))
380 xtables_error(PARAMETER_PROBLEM, "Cannot use -%c with -%c\n",
381 cmd2char(newcmd), cmd2char(*cmd & (~othercmds)));
382 *cmd |= newcmd;
383 }
384
385 /*
386 * All functions starting with "parse" should succeed, otherwise
387 * the program fails.
388 * Most routines return pointers to static data that may change
389 * between calls to the same or other routines with a few exceptions:
390 * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask"
391 * return global static data.
392 */
393
394 /* Christophe Burki wants `-p 6' to imply `-m tcp'. */
395 /* Can't be zero. */
396 static int
parse_rulenumber(const char * rule)397 parse_rulenumber(const char *rule)
398 {
399 unsigned int rulenum;
400
401 if (!xtables_strtoui(rule, NULL, &rulenum, 1, INT_MAX))
402 xtables_error(PARAMETER_PROBLEM,
403 "Invalid rule number `%s'", rule);
404
405 return rulenum;
406 }
407
408 static const char *
parse_target(const char * targetname)409 parse_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
429 static void
set_option(unsigned int * options,unsigned int option,uint8_t * invflg,int invert)430 set_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
450 static void
print_num(uint64_t number,unsigned int format)451 print_num(uint64_t number, unsigned int format)
452 {
453 if (format & FMT_KILOMEGAGIGA) {
454 if (number > 99999) {
455 number = (number + 500) / 1000;
456 if (number > 9999) {
457 number = (number + 500) / 1000;
458 if (number > 9999) {
459 number = (number + 500) / 1000;
460 if (number > 9999) {
461 number = (number + 500) / 1000;
462 printf(FMT("%4lluT ","%lluT "), (unsigned long long)number);
463 }
464 else printf(FMT("%4lluG ","%lluG "), (unsigned long long)number);
465 }
466 else printf(FMT("%4lluM ","%lluM "), (unsigned long long)number);
467 } else
468 printf(FMT("%4lluK ","%lluK "), (unsigned long long)number);
469 } else
470 printf(FMT("%5llu ","%llu "), (unsigned long long)number);
471 } else
472 printf(FMT("%8llu ","%llu "), (unsigned long long)number);
473 }
474
475
476 static void
print_header(unsigned int format,const char * chain,struct iptc_handle * handle)477 print_header(unsigned int format, const char *chain, struct iptc_handle *handle)
478 {
479 struct ipt_counters counters;
480 const char *pol = iptc_get_policy(chain, &counters, handle);
481 printf("Chain %s", chain);
482 if (pol) {
483 printf(" (policy %s", pol);
484 if (!(format & FMT_NOCOUNTS)) {
485 fputc(' ', stdout);
486 print_num(counters.pcnt, (format|FMT_NOTABLE));
487 fputs("packets, ", stdout);
488 print_num(counters.bcnt, (format|FMT_NOTABLE));
489 fputs("bytes", stdout);
490 }
491 printf(")\n");
492 } else {
493 unsigned int refs;
494 if (!iptc_get_references(&refs, chain, handle))
495 printf(" (ERROR obtaining refs)\n");
496 else
497 printf(" (%u references)\n", refs);
498 }
499
500 if (format & FMT_LINENUMBERS)
501 printf(FMT("%-4s ", "%s "), "num");
502 if (!(format & FMT_NOCOUNTS)) {
503 if (format & FMT_KILOMEGAGIGA) {
504 printf(FMT("%5s ","%s "), "pkts");
505 printf(FMT("%5s ","%s "), "bytes");
506 } else {
507 printf(FMT("%8s ","%s "), "pkts");
508 printf(FMT("%10s ","%s "), "bytes");
509 }
510 }
511 if (!(format & FMT_NOTARGET))
512 printf(FMT("%-9s ","%s "), "target");
513 fputs(" prot ", stdout);
514 if (format & FMT_OPTIONS)
515 fputs("opt", stdout);
516 if (format & FMT_VIA) {
517 printf(FMT(" %-6s ","%s "), "in");
518 printf(FMT("%-6s ","%s "), "out");
519 }
520 printf(FMT(" %-19s ","%s "), "source");
521 printf(FMT(" %-19s "," %s "), "destination");
522 printf("\n");
523 }
524
525
526 static int
print_match(const struct ipt_entry_match * m,const struct ipt_ip * ip,int numeric)527 print_match(const struct ipt_entry_match *m,
528 const struct ipt_ip *ip,
529 int numeric)
530 {
531 const struct xtables_match *match =
532 xtables_find_match(m->u.user.name, XTF_TRY_LOAD, NULL);
533
534 if (match) {
535 if (match->print)
536 match->print(ip, m, numeric);
537 else
538 printf("%s ", match->name);
539 } else {
540 if (m->u.user.name[0])
541 printf("UNKNOWN match `%s' ", m->u.user.name);
542 }
543 /* Don't stop iterating. */
544 return 0;
545 }
546
547 /* e is called `fw' here for historical reasons */
548 static void
print_firewall(const struct ipt_entry * fw,const char * targname,unsigned int num,unsigned int format,struct iptc_handle * const handle)549 print_firewall(const struct ipt_entry *fw,
550 const char *targname,
551 unsigned int num,
552 unsigned int format,
553 struct iptc_handle *const handle)
554 {
555 const struct xtables_target *target = NULL;
556 const struct ipt_entry_target *t;
557 uint8_t flags;
558 char buf[BUFSIZ];
559
560 if (!iptc_is_chain(targname, handle))
561 target = xtables_find_target(targname, XTF_TRY_LOAD);
562 else
563 target = xtables_find_target(IPT_STANDARD_TARGET,
564 XTF_LOAD_MUST_SUCCEED);
565
566 t = ipt_get_target((struct ipt_entry *)fw);
567 flags = fw->ip.flags;
568
569 if (format & FMT_LINENUMBERS)
570 printf(FMT("%-4u ", "%u "), num);
571
572 if (!(format & FMT_NOCOUNTS)) {
573 print_num(fw->counters.pcnt, format);
574 print_num(fw->counters.bcnt, format);
575 }
576
577 if (!(format & FMT_NOTARGET))
578 printf(FMT("%-9s ", "%s "), targname);
579
580 fputc(fw->ip.invflags & IPT_INV_PROTO ? '!' : ' ', stdout);
581 {
582 const char *pname = proto_to_name(fw->ip.proto, format&FMT_NUMERIC);
583 if (pname)
584 printf(FMT("%-5s", "%s "), pname);
585 else
586 printf(FMT("%-5hu", "%hu "), fw->ip.proto);
587 }
588
589 if (format & FMT_OPTIONS) {
590 if (format & FMT_NOTABLE)
591 fputs("opt ", stdout);
592 fputc(fw->ip.invflags & IPT_INV_FRAG ? '!' : '-', stdout);
593 fputc(flags & IPT_F_FRAG ? 'f' : '-', stdout);
594 fputc(' ', stdout);
595 }
596
597 if (format & FMT_VIA) {
598 char iface[IFNAMSIZ+2];
599
600 if (fw->ip.invflags & IPT_INV_VIA_IN) {
601 iface[0] = '!';
602 iface[1] = '\0';
603 }
604 else iface[0] = '\0';
605
606 if (fw->ip.iniface[0] != '\0') {
607 strcat(iface, fw->ip.iniface);
608 }
609 else if (format & FMT_NUMERIC) strcat(iface, "*");
610 else strcat(iface, "any");
611 printf(FMT(" %-6s ","in %s "), iface);
612
613 if (fw->ip.invflags & IPT_INV_VIA_OUT) {
614 iface[0] = '!';
615 iface[1] = '\0';
616 }
617 else iface[0] = '\0';
618
619 if (fw->ip.outiface[0] != '\0') {
620 strcat(iface, fw->ip.outiface);
621 }
622 else if (format & FMT_NUMERIC) strcat(iface, "*");
623 else strcat(iface, "any");
624 printf(FMT("%-6s ","out %s "), iface);
625 }
626
627 fputc(fw->ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout);
628 if (fw->ip.smsk.s_addr == 0L && !(format & FMT_NUMERIC))
629 printf(FMT("%-19s ","%s "), "anywhere");
630 else {
631 if (format & FMT_NUMERIC)
632 strcpy(buf, xtables_ipaddr_to_numeric(&fw->ip.src));
633 else
634 strcpy(buf, xtables_ipaddr_to_anyname(&fw->ip.src));
635 strcat(buf, xtables_ipmask_to_numeric(&fw->ip.smsk));
636 printf(FMT("%-19s ","%s "), buf);
637 }
638
639 fputc(fw->ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout);
640 if (fw->ip.dmsk.s_addr == 0L && !(format & FMT_NUMERIC))
641 printf(FMT("%-19s ","-> %s"), "anywhere");
642 else {
643 if (format & FMT_NUMERIC)
644 strcpy(buf, xtables_ipaddr_to_numeric(&fw->ip.dst));
645 else
646 strcpy(buf, xtables_ipaddr_to_anyname(&fw->ip.dst));
647 strcat(buf, xtables_ipmask_to_numeric(&fw->ip.dmsk));
648 printf(FMT("%-19s ","-> %s"), buf);
649 }
650
651 if (format & FMT_NOTABLE)
652 fputs(" ", stdout);
653
654 #ifdef IPT_F_GOTO
655 if(fw->ip.flags & IPT_F_GOTO)
656 printf("[goto] ");
657 #endif
658
659 IPT_MATCH_ITERATE(fw, print_match, &fw->ip, format & FMT_NUMERIC);
660
661 if (target) {
662 if (target->print)
663 /* Print the target information. */
664 target->print(&fw->ip, t, format & FMT_NUMERIC);
665 } else if (t->u.target_size != sizeof(*t))
666 printf("[%u bytes of unknown target data] ",
667 (unsigned int)(t->u.target_size - sizeof(*t)));
668
669 if (!(format & FMT_NONEWLINE))
670 fputc('\n', stdout);
671 }
672
673 static void
print_firewall_line(const struct ipt_entry * fw,struct iptc_handle * const h)674 print_firewall_line(const struct ipt_entry *fw,
675 struct iptc_handle *const h)
676 {
677 struct ipt_entry_target *t;
678
679 t = ipt_get_target((struct ipt_entry *)fw);
680 print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h);
681 }
682
683 static int
append_entry(const ipt_chainlabel chain,struct ipt_entry * fw,unsigned int nsaddrs,const struct in_addr saddrs[],const struct in_addr smasks[],unsigned int ndaddrs,const struct in_addr daddrs[],const struct in_addr dmasks[],int verbose,struct iptc_handle * handle)684 append_entry(const ipt_chainlabel chain,
685 struct ipt_entry *fw,
686 unsigned int nsaddrs,
687 const struct in_addr saddrs[],
688 const struct in_addr smasks[],
689 unsigned int ndaddrs,
690 const struct in_addr daddrs[],
691 const struct in_addr dmasks[],
692 int verbose,
693 struct iptc_handle *handle)
694 {
695 unsigned int i, j;
696 int ret = 1;
697
698 for (i = 0; i < nsaddrs; i++) {
699 fw->ip.src.s_addr = saddrs[i].s_addr;
700 fw->ip.smsk.s_addr = smasks[i].s_addr;
701 for (j = 0; j < ndaddrs; j++) {
702 fw->ip.dst.s_addr = daddrs[j].s_addr;
703 fw->ip.dmsk.s_addr = dmasks[j].s_addr;
704 if (verbose)
705 print_firewall_line(fw, handle);
706 ret &= iptc_append_entry(chain, fw, handle);
707 }
708 }
709
710 return ret;
711 }
712
713 static int
replace_entry(const ipt_chainlabel chain,struct ipt_entry * fw,unsigned int rulenum,const struct in_addr * saddr,const struct in_addr * smask,const struct in_addr * daddr,const struct in_addr * dmask,int verbose,struct iptc_handle * handle)714 replace_entry(const ipt_chainlabel chain,
715 struct ipt_entry *fw,
716 unsigned int rulenum,
717 const struct in_addr *saddr, const struct in_addr *smask,
718 const struct in_addr *daddr, const struct in_addr *dmask,
719 int verbose,
720 struct iptc_handle *handle)
721 {
722 fw->ip.src.s_addr = saddr->s_addr;
723 fw->ip.dst.s_addr = daddr->s_addr;
724 fw->ip.smsk.s_addr = smask->s_addr;
725 fw->ip.dmsk.s_addr = dmask->s_addr;
726
727 if (verbose)
728 print_firewall_line(fw, handle);
729 return iptc_replace_entry(chain, fw, rulenum, handle);
730 }
731
732 static int
insert_entry(const ipt_chainlabel chain,struct ipt_entry * fw,unsigned int rulenum,unsigned int nsaddrs,const struct in_addr saddrs[],const struct in_addr smasks[],unsigned int ndaddrs,const struct in_addr daddrs[],const struct in_addr dmasks[],int verbose,struct iptc_handle * handle)733 insert_entry(const ipt_chainlabel chain,
734 struct ipt_entry *fw,
735 unsigned int rulenum,
736 unsigned int nsaddrs,
737 const struct in_addr saddrs[],
738 const struct in_addr smasks[],
739 unsigned int ndaddrs,
740 const struct in_addr daddrs[],
741 const struct in_addr dmasks[],
742 int verbose,
743 struct iptc_handle *handle)
744 {
745 unsigned int i, j;
746 int ret = 1;
747
748 for (i = 0; i < nsaddrs; i++) {
749 fw->ip.src.s_addr = saddrs[i].s_addr;
750 fw->ip.smsk.s_addr = smasks[i].s_addr;
751 for (j = 0; j < ndaddrs; j++) {
752 fw->ip.dst.s_addr = daddrs[j].s_addr;
753 fw->ip.dmsk.s_addr = dmasks[j].s_addr;
754 if (verbose)
755 print_firewall_line(fw, handle);
756 ret &= iptc_insert_entry(chain, fw, rulenum, handle);
757 }
758 }
759
760 return ret;
761 }
762
763 static unsigned char *
make_delete_mask(const struct xtables_rule_match * matches,const struct xtables_target * target)764 make_delete_mask(const struct xtables_rule_match *matches,
765 const struct xtables_target *target)
766 {
767 /* Establish mask for comparison */
768 unsigned int size;
769 const struct xtables_rule_match *matchp;
770 unsigned char *mask, *mptr;
771
772 size = sizeof(struct ipt_entry);
773 for (matchp = matches; matchp; matchp = matchp->next)
774 size += XT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size;
775
776 mask = xtables_calloc(1, size
777 + XT_ALIGN(sizeof(struct ipt_entry_target))
778 + target->size);
779
780 memset(mask, 0xFF, sizeof(struct ipt_entry));
781 mptr = mask + sizeof(struct ipt_entry);
782
783 for (matchp = matches; matchp; matchp = matchp->next) {
784 memset(mptr, 0xFF,
785 XT_ALIGN(sizeof(struct ipt_entry_match))
786 + matchp->match->userspacesize);
787 mptr += XT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size;
788 }
789
790 memset(mptr, 0xFF,
791 XT_ALIGN(sizeof(struct ipt_entry_target))
792 + target->userspacesize);
793
794 return mask;
795 }
796
797 static int
delete_entry(const ipt_chainlabel chain,struct ipt_entry * fw,unsigned int nsaddrs,const struct in_addr saddrs[],const struct in_addr smasks[],unsigned int ndaddrs,const struct in_addr daddrs[],const struct in_addr dmasks[],int verbose,struct iptc_handle * handle,struct xtables_rule_match * matches,const struct xtables_target * target)798 delete_entry(const ipt_chainlabel chain,
799 struct ipt_entry *fw,
800 unsigned int nsaddrs,
801 const struct in_addr saddrs[],
802 const struct in_addr smasks[],
803 unsigned int ndaddrs,
804 const struct in_addr daddrs[],
805 const struct in_addr dmasks[],
806 int verbose,
807 struct iptc_handle *handle,
808 struct xtables_rule_match *matches,
809 const struct xtables_target *target)
810 {
811 unsigned int i, j;
812 int ret = 1;
813 unsigned char *mask;
814
815 mask = make_delete_mask(matches, target);
816 for (i = 0; i < nsaddrs; i++) {
817 fw->ip.src.s_addr = saddrs[i].s_addr;
818 fw->ip.smsk.s_addr = smasks[i].s_addr;
819 for (j = 0; j < ndaddrs; j++) {
820 fw->ip.dst.s_addr = daddrs[j].s_addr;
821 fw->ip.dmsk.s_addr = dmasks[j].s_addr;
822 if (verbose)
823 print_firewall_line(fw, handle);
824 ret &= iptc_delete_entry(chain, fw, mask, handle);
825 }
826 }
827 free(mask);
828
829 return ret;
830 }
831
832 static int
check_entry(const ipt_chainlabel chain,struct ipt_entry * fw,unsigned int nsaddrs,const struct in_addr * saddrs,const struct in_addr * smasks,unsigned int ndaddrs,const struct in_addr * daddrs,const struct in_addr * dmasks,bool verbose,struct iptc_handle * handle,struct xtables_rule_match * matches,const struct xtables_target * target)833 check_entry(const ipt_chainlabel chain, struct ipt_entry *fw,
834 unsigned int nsaddrs, const struct in_addr *saddrs,
835 const struct in_addr *smasks, unsigned int ndaddrs,
836 const struct in_addr *daddrs, const struct in_addr *dmasks,
837 bool verbose, struct iptc_handle *handle,
838 struct xtables_rule_match *matches,
839 const struct xtables_target *target)
840 {
841 unsigned int i, j;
842 int ret = 1;
843 unsigned char *mask;
844
845 mask = make_delete_mask(matches, target);
846 for (i = 0; i < nsaddrs; i++) {
847 fw->ip.src.s_addr = saddrs[i].s_addr;
848 fw->ip.smsk.s_addr = smasks[i].s_addr;
849 for (j = 0; j < ndaddrs; j++) {
850 fw->ip.dst.s_addr = daddrs[j].s_addr;
851 fw->ip.dmsk.s_addr = dmasks[j].s_addr;
852 if (verbose)
853 print_firewall_line(fw, handle);
854 ret &= iptc_check_entry(chain, fw, mask, handle);
855 }
856 }
857
858 free(mask);
859 return ret;
860 }
861
862 int
for_each_chain4(int (* fn)(const ipt_chainlabel,int,struct iptc_handle *),int verbose,int builtinstoo,struct iptc_handle * handle)863 for_each_chain4(int (*fn)(const ipt_chainlabel, int, struct iptc_handle *),
864 int verbose, int builtinstoo, struct iptc_handle *handle)
865 {
866 int ret = 1;
867 const char *chain;
868 char *chains;
869 unsigned int i, chaincount = 0;
870
871 chain = iptc_first_chain(handle);
872 while (chain) {
873 chaincount++;
874 chain = iptc_next_chain(handle);
875 }
876
877 chains = xtables_malloc(sizeof(ipt_chainlabel) * chaincount);
878 i = 0;
879 chain = iptc_first_chain(handle);
880 while (chain) {
881 strcpy(chains + i*sizeof(ipt_chainlabel), chain);
882 i++;
883 chain = iptc_next_chain(handle);
884 }
885
886 for (i = 0; i < chaincount; i++) {
887 if (!builtinstoo
888 && iptc_builtin(chains + i*sizeof(ipt_chainlabel),
889 handle) == 1)
890 continue;
891 ret &= fn(chains + i*sizeof(ipt_chainlabel), verbose, handle);
892 }
893
894 free(chains);
895 return ret;
896 }
897
898 int
flush_entries4(const ipt_chainlabel chain,int verbose,struct iptc_handle * handle)899 flush_entries4(const ipt_chainlabel chain, int verbose,
900 struct iptc_handle *handle)
901 {
902 if (!chain)
903 return for_each_chain4(flush_entries4, verbose, 1, handle);
904
905 if (verbose)
906 fprintf(stdout, "Flushing chain `%s'\n", chain);
907 return iptc_flush_entries(chain, handle);
908 }
909
910 static int
zero_entries(const ipt_chainlabel chain,int verbose,struct iptc_handle * handle)911 zero_entries(const ipt_chainlabel chain, int verbose,
912 struct iptc_handle *handle)
913 {
914 if (!chain)
915 return for_each_chain4(zero_entries, verbose, 1, handle);
916
917 if (verbose)
918 fprintf(stdout, "Zeroing chain `%s'\n", chain);
919 return iptc_zero_entries(chain, handle);
920 }
921
922 int
delete_chain4(const ipt_chainlabel chain,int verbose,struct iptc_handle * handle)923 delete_chain4(const ipt_chainlabel chain, int verbose,
924 struct iptc_handle *handle)
925 {
926 if (!chain)
927 return for_each_chain4(delete_chain4, verbose, 0, handle);
928
929 if (verbose)
930 fprintf(stdout, "Deleting chain `%s'\n", chain);
931 return iptc_delete_chain(chain, handle);
932 }
933
934 static int
list_entries(const ipt_chainlabel chain,int rulenum,int verbose,int numeric,int expanded,int linenumbers,struct iptc_handle * handle)935 list_entries(const ipt_chainlabel chain, int rulenum, int verbose, int numeric,
936 int expanded, int linenumbers, struct iptc_handle *handle)
937 {
938 int found = 0;
939 unsigned int format;
940 const char *this;
941
942 format = FMT_OPTIONS;
943 if (!verbose)
944 format |= FMT_NOCOUNTS;
945 else
946 format |= FMT_VIA;
947
948 if (numeric)
949 format |= FMT_NUMERIC;
950
951 if (!expanded)
952 format |= FMT_KILOMEGAGIGA;
953
954 if (linenumbers)
955 format |= FMT_LINENUMBERS;
956
957 for (this = iptc_first_chain(handle);
958 this;
959 this = iptc_next_chain(handle)) {
960 const struct ipt_entry *i;
961 unsigned int num;
962
963 if (chain && strcmp(chain, this) != 0)
964 continue;
965
966 if (found) printf("\n");
967
968 if (!rulenum)
969 print_header(format, this, handle);
970 i = iptc_first_rule(this, handle);
971
972 num = 0;
973 while (i) {
974 num++;
975 if (!rulenum || num == rulenum)
976 print_firewall(i,
977 iptc_get_target(i, handle),
978 num,
979 format,
980 handle);
981 i = iptc_next_rule(i, handle);
982 }
983 found = 1;
984 }
985
986 errno = ENOENT;
987 return found;
988 }
989
print_proto(uint16_t proto,int invert)990 static void print_proto(uint16_t proto, int invert)
991 {
992 if (proto) {
993 unsigned int i;
994 const char *invertstr = invert ? " !" : "";
995
996 const struct protoent *pent = getprotobynumber(proto);
997 if (pent) {
998 printf("%s -p %s", invertstr, pent->p_name);
999 return;
1000 }
1001
1002 for (i = 0; xtables_chain_protos[i].name != NULL; ++i)
1003 if (xtables_chain_protos[i].num == proto) {
1004 printf("%s -p %s",
1005 invertstr, xtables_chain_protos[i].name);
1006 return;
1007 }
1008
1009 printf("%s -p %u", invertstr, proto);
1010 }
1011 }
1012
1013 #define IP_PARTS_NATIVE(n) \
1014 (unsigned int)((n)>>24)&0xFF, \
1015 (unsigned int)((n)>>16)&0xFF, \
1016 (unsigned int)((n)>>8)&0xFF, \
1017 (unsigned int)((n)&0xFF)
1018
1019 #define IP_PARTS(n) IP_PARTS_NATIVE(ntohl(n))
1020
1021 /* This assumes that mask is contiguous, and byte-bounded. */
1022 static void
print_iface(char letter,const char * iface,const unsigned char * mask,int invert)1023 print_iface(char letter, const char *iface, const unsigned char *mask,
1024 int invert)
1025 {
1026 unsigned int i;
1027
1028 if (mask[0] == 0)
1029 return;
1030
1031 printf("%s -%c ", invert ? " !" : "", letter);
1032
1033 for (i = 0; i < IFNAMSIZ; i++) {
1034 if (mask[i] != 0) {
1035 if (iface[i] != '\0')
1036 printf("%c", iface[i]);
1037 } else {
1038 /* we can access iface[i-1] here, because
1039 * a few lines above we make sure that mask[0] != 0 */
1040 if (iface[i-1] != '\0')
1041 printf("+");
1042 break;
1043 }
1044 }
1045 }
1046
print_match_save(const struct ipt_entry_match * e,const struct ipt_ip * ip)1047 static int print_match_save(const struct ipt_entry_match *e,
1048 const struct ipt_ip *ip)
1049 {
1050 const struct xtables_match *match =
1051 xtables_find_match(e->u.user.name, XTF_TRY_LOAD, NULL);
1052
1053 if (match) {
1054 printf(" -m %s", e->u.user.name);
1055
1056 /* some matches don't provide a save function */
1057 if (match->save)
1058 match->save(ip, e);
1059 } else {
1060 if (e->u.match_size) {
1061 fprintf(stderr,
1062 "Can't find library for match `%s'\n",
1063 e->u.user.name);
1064 exit(1);
1065 }
1066 }
1067 return 0;
1068 }
1069
1070 /* print a given ip including mask if neccessary */
print_ip(const char * prefix,uint32_t ip,uint32_t mask,int invert)1071 static void print_ip(const char *prefix, uint32_t ip,
1072 uint32_t mask, int invert)
1073 {
1074 uint32_t bits, hmask = ntohl(mask);
1075 int i;
1076
1077 if (!mask && !ip && !invert)
1078 return;
1079
1080 printf("%s %s %u.%u.%u.%u",
1081 invert ? " !" : "",
1082 prefix,
1083 IP_PARTS(ip));
1084
1085 if (mask == 0xFFFFFFFFU) {
1086 printf("/32");
1087 return;
1088 }
1089
1090 i = 32;
1091 bits = 0xFFFFFFFEU;
1092 while (--i >= 0 && hmask != bits)
1093 bits <<= 1;
1094 if (i >= 0)
1095 printf("/%u", i);
1096 else
1097 printf("/%u.%u.%u.%u", IP_PARTS(mask));
1098 }
1099
1100 /* We want this to be readable, so only print out neccessary fields.
1101 * Because that's the kind of world I want to live in. */
print_rule4(const struct ipt_entry * e,struct iptc_handle * h,const char * chain,int counters)1102 void print_rule4(const struct ipt_entry *e,
1103 struct iptc_handle *h, const char *chain, int counters)
1104 {
1105 const struct ipt_entry_target *t;
1106 const char *target_name;
1107
1108 /* print counters for iptables-save */
1109 if (counters > 0)
1110 printf("[%llu:%llu] ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt);
1111
1112 /* print chain name */
1113 printf("-A %s", chain);
1114
1115 /* Print IP part. */
1116 print_ip("-s", e->ip.src.s_addr,e->ip.smsk.s_addr,
1117 e->ip.invflags & IPT_INV_SRCIP);
1118
1119 print_ip("-d", e->ip.dst.s_addr, e->ip.dmsk.s_addr,
1120 e->ip.invflags & IPT_INV_DSTIP);
1121
1122 print_iface('i', e->ip.iniface, e->ip.iniface_mask,
1123 e->ip.invflags & IPT_INV_VIA_IN);
1124
1125 print_iface('o', e->ip.outiface, e->ip.outiface_mask,
1126 e->ip.invflags & IPT_INV_VIA_OUT);
1127
1128 print_proto(e->ip.proto, e->ip.invflags & IPT_INV_PROTO);
1129
1130 if (e->ip.flags & IPT_F_FRAG)
1131 printf("%s -f",
1132 e->ip.invflags & IPT_INV_FRAG ? " !" : "");
1133
1134 /* Print matchinfo part */
1135 if (e->target_offset) {
1136 IPT_MATCH_ITERATE(e, print_match_save, &e->ip);
1137 }
1138
1139 /* print counters for iptables -R */
1140 if (counters < 0)
1141 printf(" -c %llu %llu", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt);
1142
1143 /* Print target name */
1144 target_name = iptc_get_target(e, h);
1145 if (target_name && (*target_name != '\0'))
1146 #ifdef IPT_F_GOTO
1147 printf(" -%c %s", e->ip.flags & IPT_F_GOTO ? 'g' : 'j', target_name);
1148 #else
1149 printf(" -j %s", target_name);
1150 #endif
1151
1152 /* Print targinfo part */
1153 t = ipt_get_target((struct ipt_entry *)e);
1154 if (t->u.user.name[0]) {
1155 const struct xtables_target *target =
1156 xtables_find_target(t->u.user.name, XTF_TRY_LOAD);
1157
1158 if (!target) {
1159 fprintf(stderr, "Can't find library for target `%s'\n",
1160 t->u.user.name);
1161 exit(1);
1162 }
1163
1164 if (target->save)
1165 target->save(&e->ip, t);
1166 else {
1167 /* If the target size is greater than ipt_entry_target
1168 * there is something to be saved, we just don't know
1169 * how to print it */
1170 if (t->u.target_size !=
1171 sizeof(struct ipt_entry_target)) {
1172 fprintf(stderr, "Target `%s' is missing "
1173 "save function\n",
1174 t->u.user.name);
1175 exit(1);
1176 }
1177 }
1178 }
1179 printf("\n");
1180 }
1181
1182 static int
list_rules(const ipt_chainlabel chain,int rulenum,int counters,struct iptc_handle * handle)1183 list_rules(const ipt_chainlabel chain, int rulenum, int counters,
1184 struct iptc_handle *handle)
1185 {
1186 const char *this = NULL;
1187 int found = 0;
1188
1189 if (counters)
1190 counters = -1; /* iptables -c format */
1191
1192 /* Dump out chain names first,
1193 * thereby preventing dependency conflicts */
1194 if (!rulenum) for (this = iptc_first_chain(handle);
1195 this;
1196 this = iptc_next_chain(handle)) {
1197 if (chain && strcmp(this, chain) != 0)
1198 continue;
1199
1200 if (iptc_builtin(this, handle)) {
1201 struct ipt_counters count;
1202 printf("-P %s %s", this, iptc_get_policy(this, &count, handle));
1203 if (counters)
1204 printf(" -c %llu %llu", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt);
1205 printf("\n");
1206 } else {
1207 printf("-N %s\n", this);
1208 }
1209 }
1210
1211 for (this = iptc_first_chain(handle);
1212 this;
1213 this = iptc_next_chain(handle)) {
1214 const struct ipt_entry *e;
1215 int num = 0;
1216
1217 if (chain && strcmp(this, chain) != 0)
1218 continue;
1219
1220 /* Dump out rules */
1221 e = iptc_first_rule(this, handle);
1222 while(e) {
1223 num++;
1224 if (!rulenum || num == rulenum)
1225 print_rule4(e, handle, this, counters);
1226 e = iptc_next_rule(e, handle);
1227 }
1228 found = 1;
1229 }
1230
1231 errno = ENOENT;
1232 return found;
1233 }
1234
1235 static struct ipt_entry *
generate_entry(const struct ipt_entry * fw,struct xtables_rule_match * matches,struct ipt_entry_target * target)1236 generate_entry(const struct ipt_entry *fw,
1237 struct xtables_rule_match *matches,
1238 struct ipt_entry_target *target)
1239 {
1240 unsigned int size;
1241 struct xtables_rule_match *matchp;
1242 struct ipt_entry *e;
1243
1244 size = sizeof(struct ipt_entry);
1245 for (matchp = matches; matchp; matchp = matchp->next)
1246 size += matchp->match->m->u.match_size;
1247
1248 e = xtables_malloc(size + target->u.target_size);
1249 *e = *fw;
1250 e->target_offset = size;
1251 e->next_offset = size + target->u.target_size;
1252
1253 size = 0;
1254 for (matchp = matches; matchp; matchp = matchp->next) {
1255 memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size);
1256 size += matchp->match->m->u.match_size;
1257 }
1258 memcpy(e->elems + size, target, target->u.target_size);
1259
1260 return e;
1261 }
1262
clear_rule_matches(struct xtables_rule_match ** matches)1263 static void clear_rule_matches(struct xtables_rule_match **matches)
1264 {
1265 struct xtables_rule_match *matchp, *tmp;
1266
1267 for (matchp = *matches; matchp;) {
1268 tmp = matchp->next;
1269 if (matchp->match->m) {
1270 free(matchp->match->m);
1271 matchp->match->m = NULL;
1272 }
1273 if (matchp->match == matchp->match->next) {
1274 free(matchp->match);
1275 matchp->match = NULL;
1276 }
1277 free(matchp);
1278 matchp = tmp;
1279 }
1280
1281 *matches = NULL;
1282 }
1283
1284 void
get_kernel_version(void)1285 get_kernel_version(void) {
1286 static struct utsname uts;
1287 int x = 0, y = 0, z = 0;
1288
1289 if (uname(&uts) == -1) {
1290 fprintf(stderr, "Unable to retrieve kernel version.\n");
1291 xtables_free_opts(1);
1292 exit(1);
1293 }
1294
1295 sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
1296 kernel_version = LINUX_VERSION(x, y, z);
1297 }
1298
command_jump(struct iptables_command_state * cs)1299 static void command_jump(struct iptables_command_state *cs)
1300 {
1301 size_t size;
1302
1303 set_option(&cs->options, OPT_JUMP, &cs->fw.ip.invflags, cs->invert);
1304 cs->jumpto = parse_target(optarg);
1305 /* TRY_LOAD (may be chain name) */
1306 cs->target = xtables_find_target(cs->jumpto, XTF_TRY_LOAD);
1307
1308 if (cs->target == NULL)
1309 return;
1310
1311 size = XT_ALIGN(sizeof(struct ipt_entry_target))
1312 + cs->target->size;
1313
1314 cs->target->t = xtables_calloc(1, size);
1315 cs->target->t->u.target_size = size;
1316 strcpy(cs->target->t->u.user.name, cs->jumpto);
1317 cs->target->t->u.user.revision = cs->target->revision;
1318 if (cs->target->init != NULL)
1319 cs->target->init(cs->target->t);
1320 if (cs->target->x6_options != NULL)
1321 opts = xtables_options_xfrm(iptables_globals.orig_opts, opts,
1322 cs->target->x6_options,
1323 &cs->target->option_offset);
1324 else
1325 opts = xtables_merge_options(iptables_globals.orig_opts, opts,
1326 cs->target->extra_opts,
1327 &cs->target->option_offset);
1328 if (opts == NULL)
1329 xtables_error(OTHER_PROBLEM, "can't alloc memory!");
1330 }
1331
command_match(struct iptables_command_state * cs)1332 static void command_match(struct iptables_command_state *cs)
1333 {
1334 struct xtables_match *m;
1335 size_t size;
1336
1337 if (cs->invert)
1338 xtables_error(PARAMETER_PROBLEM,
1339 "unexpected ! flag before --match");
1340
1341 m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, &cs->matches);
1342 size = XT_ALIGN(sizeof(struct ipt_entry_match)) + m->size;
1343 m->m = xtables_calloc(1, size);
1344 m->m->u.match_size = size;
1345 strcpy(m->m->u.user.name, m->name);
1346 m->m->u.user.revision = m->revision;
1347 if (m->init != NULL)
1348 m->init(m->m);
1349 if (m == m->next)
1350 return;
1351 /* Merge options for non-cloned matches */
1352 if (m->x6_options != NULL)
1353 opts = xtables_options_xfrm(iptables_globals.orig_opts, opts,
1354 m->x6_options, &m->option_offset);
1355 else if (m->extra_opts != NULL)
1356 opts = xtables_merge_options(iptables_globals.orig_opts, opts,
1357 m->extra_opts, &m->option_offset);
1358 if (opts == NULL)
1359 xtables_error(OTHER_PROBLEM, "can't alloc memory!");
1360 }
1361
do_command4(int argc,char * argv[],char ** table,struct iptc_handle ** handle)1362 int do_command4(int argc, char *argv[], char **table, struct iptc_handle **handle)
1363 {
1364 struct iptables_command_state cs;
1365 struct ipt_entry *e = NULL;
1366 unsigned int nsaddrs = 0, ndaddrs = 0;
1367 struct in_addr *saddrs = NULL, *smasks = NULL;
1368 struct in_addr *daddrs = NULL, *dmasks = NULL;
1369
1370 int verbose = 0;
1371 const char *chain = NULL;
1372 const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL;
1373 const char *policy = NULL, *newname = NULL;
1374 unsigned int rulenum = 0, command = 0;
1375 const char *pcnt = NULL, *bcnt = NULL;
1376 int ret = 1;
1377 struct xtables_match *m;
1378 struct xtables_rule_match *matchp;
1379 struct xtables_target *t;
1380 unsigned long long cnt;
1381
1382 memset(&cs, 0, sizeof(cs));
1383 cs.jumpto = "";
1384 cs.argv = argv;
1385
1386 /* re-set optind to 0 in case do_command4 gets called
1387 * a second time */
1388 optind = 0;
1389
1390 /* clear mflags in case do_command4 gets called a second time
1391 * (we clear the global list of all matches for security)*/
1392 for (m = xtables_matches; m; m = m->next)
1393 m->mflags = 0;
1394
1395 for (t = xtables_targets; t; t = t->next) {
1396 t->tflags = 0;
1397 t->used = 0;
1398 }
1399
1400 /* Suppress error messages: we may add new options if we
1401 demand-load a protocol. */
1402 opterr = 0;
1403
1404 opts = xt_params->orig_opts;
1405 while ((cs.c = getopt_long(argc, argv,
1406 "-:A:C:D:R:I:L::S::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:fbvnt:m:xc:g:46",
1407 opts, NULL)) != -1) {
1408 switch (cs.c) {
1409 /*
1410 * Command selection
1411 */
1412 case 'A':
1413 add_command(&command, CMD_APPEND, CMD_NONE,
1414 cs.invert);
1415 chain = optarg;
1416 break;
1417
1418 case 'C':
1419 add_command(&command, CMD_CHECK, CMD_NONE,
1420 cs.invert);
1421 chain = optarg;
1422 break;
1423
1424 case 'D':
1425 add_command(&command, CMD_DELETE, CMD_NONE,
1426 cs.invert);
1427 chain = optarg;
1428 if (optind < argc && argv[optind][0] != '-'
1429 && argv[optind][0] != '!') {
1430 rulenum = parse_rulenumber(argv[optind++]);
1431 command = CMD_DELETE_NUM;
1432 }
1433 break;
1434
1435 case 'R':
1436 add_command(&command, CMD_REPLACE, CMD_NONE,
1437 cs.invert);
1438 chain = optarg;
1439 if (optind < argc && argv[optind][0] != '-'
1440 && argv[optind][0] != '!')
1441 rulenum = parse_rulenumber(argv[optind++]);
1442 else
1443 xtables_error(PARAMETER_PROBLEM,
1444 "-%c requires a rule number",
1445 cmd2char(CMD_REPLACE));
1446 break;
1447
1448 case 'I':
1449 add_command(&command, CMD_INSERT, CMD_NONE,
1450 cs.invert);
1451 chain = optarg;
1452 if (optind < argc && argv[optind][0] != '-'
1453 && argv[optind][0] != '!')
1454 rulenum = parse_rulenumber(argv[optind++]);
1455 else rulenum = 1;
1456 break;
1457
1458 case 'L':
1459 add_command(&command, CMD_LIST,
1460 CMD_ZERO | CMD_ZERO_NUM, cs.invert);
1461 if (optarg) chain = optarg;
1462 else if (optind < argc && argv[optind][0] != '-'
1463 && argv[optind][0] != '!')
1464 chain = argv[optind++];
1465 if (optind < argc && argv[optind][0] != '-'
1466 && argv[optind][0] != '!')
1467 rulenum = parse_rulenumber(argv[optind++]);
1468 break;
1469
1470 case 'S':
1471 add_command(&command, CMD_LIST_RULES,
1472 CMD_ZERO|CMD_ZERO_NUM, cs.invert);
1473 if (optarg) chain = optarg;
1474 else if (optind < argc && argv[optind][0] != '-'
1475 && argv[optind][0] != '!')
1476 chain = argv[optind++];
1477 if (optind < argc && argv[optind][0] != '-'
1478 && argv[optind][0] != '!')
1479 rulenum = parse_rulenumber(argv[optind++]);
1480 break;
1481
1482 case 'F':
1483 add_command(&command, CMD_FLUSH, CMD_NONE,
1484 cs.invert);
1485 if (optarg) chain = optarg;
1486 else if (optind < argc && argv[optind][0] != '-'
1487 && argv[optind][0] != '!')
1488 chain = argv[optind++];
1489 break;
1490
1491 case 'Z':
1492 add_command(&command, CMD_ZERO, CMD_LIST|CMD_LIST_RULES,
1493 cs.invert);
1494 if (optarg) chain = optarg;
1495 else if (optind < argc && argv[optind][0] != '-'
1496 && argv[optind][0] != '!')
1497 chain = argv[optind++];
1498 if (optind < argc && argv[optind][0] != '-'
1499 && argv[optind][0] != '!') {
1500 rulenum = parse_rulenumber(argv[optind++]);
1501 command = CMD_ZERO_NUM;
1502 }
1503 break;
1504
1505 case 'N':
1506 if (optarg && (*optarg == '-' || *optarg == '!'))
1507 xtables_error(PARAMETER_PROBLEM,
1508 "chain name not allowed to start "
1509 "with `%c'\n", *optarg);
1510 if (xtables_find_target(optarg, XTF_TRY_LOAD))
1511 xtables_error(PARAMETER_PROBLEM,
1512 "chain name may not clash "
1513 "with target name\n");
1514 add_command(&command, CMD_NEW_CHAIN, CMD_NONE,
1515 cs.invert);
1516 chain = optarg;
1517 break;
1518
1519 case 'X':
1520 add_command(&command, CMD_DELETE_CHAIN, CMD_NONE,
1521 cs.invert);
1522 if (optarg) chain = optarg;
1523 else if (optind < argc && argv[optind][0] != '-'
1524 && argv[optind][0] != '!')
1525 chain = argv[optind++];
1526 break;
1527
1528 case 'E':
1529 add_command(&command, CMD_RENAME_CHAIN, CMD_NONE,
1530 cs.invert);
1531 chain = optarg;
1532 if (optind < argc && argv[optind][0] != '-'
1533 && argv[optind][0] != '!')
1534 newname = argv[optind++];
1535 else
1536 xtables_error(PARAMETER_PROBLEM,
1537 "-%c requires old-chain-name and "
1538 "new-chain-name",
1539 cmd2char(CMD_RENAME_CHAIN));
1540 break;
1541
1542 case 'P':
1543 add_command(&command, CMD_SET_POLICY, CMD_NONE,
1544 cs.invert);
1545 chain = optarg;
1546 if (optind < argc && argv[optind][0] != '-'
1547 && argv[optind][0] != '!')
1548 policy = argv[optind++];
1549 else
1550 xtables_error(PARAMETER_PROBLEM,
1551 "-%c requires a chain and a policy",
1552 cmd2char(CMD_SET_POLICY));
1553 break;
1554
1555 case 'h':
1556 if (!optarg)
1557 optarg = argv[optind];
1558
1559 /* iptables -p icmp -h */
1560 if (!cs.matches && cs.protocol)
1561 xtables_find_match(cs.protocol,
1562 XTF_TRY_LOAD, &cs.matches);
1563
1564 exit_printhelp(cs.matches);
1565
1566 /*
1567 * Option selection
1568 */
1569 case 'p':
1570 xtables_check_inverse(optarg, &cs.invert, &optind, argc, argv);
1571 set_option(&cs.options, OPT_PROTOCOL, &cs.fw.ip.invflags,
1572 cs.invert);
1573
1574 /* Canonicalize into lower case */
1575 for (cs.protocol = optarg; *cs.protocol; cs.protocol++)
1576 *cs.protocol = tolower(*cs.protocol);
1577
1578 cs.protocol = optarg;
1579 cs.fw.ip.proto = xtables_parse_protocol(cs.protocol);
1580
1581 if (cs.fw.ip.proto == 0
1582 && (cs.fw.ip.invflags & IPT_INV_PROTO))
1583 xtables_error(PARAMETER_PROBLEM,
1584 "rule would never match protocol");
1585 break;
1586
1587 case 's':
1588 xtables_check_inverse(optarg, &cs.invert, &optind, argc, argv);
1589 set_option(&cs.options, OPT_SOURCE, &cs.fw.ip.invflags,
1590 cs.invert);
1591 shostnetworkmask = optarg;
1592 break;
1593
1594 case 'd':
1595 xtables_check_inverse(optarg, &cs.invert, &optind, argc, argv);
1596 set_option(&cs.options, OPT_DESTINATION, &cs.fw.ip.invflags,
1597 cs.invert);
1598 dhostnetworkmask = optarg;
1599 break;
1600
1601 #ifdef IPT_F_GOTO
1602 case 'g':
1603 set_option(&cs.options, OPT_JUMP, &cs.fw.ip.invflags,
1604 cs.invert);
1605 cs.fw.ip.flags |= IPT_F_GOTO;
1606 cs.jumpto = parse_target(optarg);
1607 break;
1608 #endif
1609
1610 case 'j':
1611 command_jump(&cs);
1612 break;
1613
1614
1615 case 'i':
1616 if (*optarg == '\0')
1617 xtables_error(PARAMETER_PROBLEM,
1618 "Empty interface is likely to be "
1619 "undesired");
1620 xtables_check_inverse(optarg, &cs.invert, &optind, argc, argv);
1621 set_option(&cs.options, OPT_VIANAMEIN, &cs.fw.ip.invflags,
1622 cs.invert);
1623 xtables_parse_interface(optarg,
1624 cs.fw.ip.iniface,
1625 cs.fw.ip.iniface_mask);
1626 break;
1627
1628 case 'o':
1629 if (*optarg == '\0')
1630 xtables_error(PARAMETER_PROBLEM,
1631 "Empty interface is likely to be "
1632 "undesired");
1633 xtables_check_inverse(optarg, &cs.invert, &optind, argc, argv);
1634 set_option(&cs.options, OPT_VIANAMEOUT, &cs.fw.ip.invflags,
1635 cs.invert);
1636 xtables_parse_interface(optarg,
1637 cs.fw.ip.outiface,
1638 cs.fw.ip.outiface_mask);
1639 break;
1640
1641 case 'f':
1642 set_option(&cs.options, OPT_FRAGMENT, &cs.fw.ip.invflags,
1643 cs.invert);
1644 cs.fw.ip.flags |= IPT_F_FRAG;
1645 break;
1646
1647 case 'v':
1648 if (!verbose)
1649 set_option(&cs.options, OPT_VERBOSE,
1650 &cs.fw.ip.invflags, cs.invert);
1651 verbose++;
1652 break;
1653
1654 case 'm':
1655 command_match(&cs);
1656 break;
1657
1658 case 'n':
1659 set_option(&cs.options, OPT_NUMERIC, &cs.fw.ip.invflags,
1660 cs.invert);
1661 break;
1662
1663 case 't':
1664 if (cs.invert)
1665 xtables_error(PARAMETER_PROBLEM,
1666 "unexpected ! flag before --table");
1667 *table = optarg;
1668 break;
1669
1670 case 'x':
1671 set_option(&cs.options, OPT_EXPANDED, &cs.fw.ip.invflags,
1672 cs.invert);
1673 break;
1674
1675 case 'V':
1676 if (cs.invert)
1677 printf("Not %s ;-)\n", prog_vers);
1678 else
1679 printf("%s v%s\n",
1680 prog_name, prog_vers);
1681 exit(0);
1682
1683 case '0':
1684 set_option(&cs.options, OPT_LINENUMBERS, &cs.fw.ip.invflags,
1685 cs.invert);
1686 break;
1687
1688 case 'M':
1689 xtables_modprobe_program = optarg;
1690 break;
1691
1692 case 'c':
1693
1694 set_option(&cs.options, OPT_COUNTERS, &cs.fw.ip.invflags,
1695 cs.invert);
1696 pcnt = optarg;
1697 bcnt = strchr(pcnt + 1, ',');
1698 if (bcnt)
1699 bcnt++;
1700 if (!bcnt && optind < argc && argv[optind][0] != '-'
1701 && argv[optind][0] != '!')
1702 bcnt = argv[optind++];
1703 if (!bcnt)
1704 xtables_error(PARAMETER_PROBLEM,
1705 "-%c requires packet and byte counter",
1706 opt2char(OPT_COUNTERS));
1707
1708 if (sscanf(pcnt, "%llu", &cnt) != 1)
1709 xtables_error(PARAMETER_PROBLEM,
1710 "-%c packet counter not numeric",
1711 opt2char(OPT_COUNTERS));
1712 cs.fw.counters.pcnt = cnt;
1713
1714 if (sscanf(bcnt, "%llu", &cnt) != 1)
1715 xtables_error(PARAMETER_PROBLEM,
1716 "-%c byte counter not numeric",
1717 opt2char(OPT_COUNTERS));
1718 cs.fw.counters.bcnt = cnt;
1719 break;
1720
1721 case '4':
1722 /* This is indeed the IPv4 iptables */
1723 break;
1724
1725 case '6':
1726 /* This is not the IPv6 ip6tables */
1727 if (line != -1)
1728 return 1; /* success: line ignored */
1729 fprintf(stderr, "This is the IPv4 version of iptables.\n");
1730 exit_tryhelp(2);
1731
1732 case 1: /* non option */
1733 if (optarg[0] == '!' && optarg[1] == '\0') {
1734 if (cs.invert)
1735 xtables_error(PARAMETER_PROBLEM,
1736 "multiple consecutive ! not"
1737 " allowed");
1738 cs.invert = TRUE;
1739 optarg[0] = '\0';
1740 continue;
1741 }
1742 fprintf(stderr, "Bad argument `%s'\n", optarg);
1743 exit_tryhelp(2);
1744
1745 default:
1746 if (command_default(&cs, &iptables_globals) == 1)
1747 /* cf. ip6tables.c */
1748 continue;
1749 break;
1750 }
1751 cs.invert = FALSE;
1752 }
1753
1754 if (strcmp(*table, "nat") == 0 &&
1755 ((policy != NULL && strcmp(policy, "DROP") == 0) ||
1756 (cs.jumpto != NULL && strcmp(cs.jumpto, "DROP") == 0)))
1757 xtables_error(PARAMETER_PROBLEM,
1758 "\nThe \"nat\" table is not intended for filtering, "
1759 "the use of DROP is therefore inhibited.\n\n");
1760
1761 for (matchp = cs.matches; matchp; matchp = matchp->next)
1762 xtables_option_mfcall(matchp->match);
1763 if (cs.target != NULL)
1764 xtables_option_tfcall(cs.target);
1765
1766 /* Fix me: must put inverse options checking here --MN */
1767
1768 if (optind < argc)
1769 xtables_error(PARAMETER_PROBLEM,
1770 "unknown arguments found on commandline");
1771 if (!command)
1772 xtables_error(PARAMETER_PROBLEM, "no command specified");
1773 if (cs.invert)
1774 xtables_error(PARAMETER_PROBLEM,
1775 "nothing appropriate following !");
1776
1777 if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND | CMD_CHECK)) {
1778 if (!(cs.options & OPT_DESTINATION))
1779 dhostnetworkmask = "0.0.0.0/0";
1780 if (!(cs.options & OPT_SOURCE))
1781 shostnetworkmask = "0.0.0.0/0";
1782 }
1783
1784 if (shostnetworkmask)
1785 xtables_ipparse_multiple(shostnetworkmask, &saddrs,
1786 &smasks, &nsaddrs);
1787
1788 if (dhostnetworkmask)
1789 xtables_ipparse_multiple(dhostnetworkmask, &daddrs,
1790 &dmasks, &ndaddrs);
1791
1792 if ((nsaddrs > 1 || ndaddrs > 1) &&
1793 (cs.fw.ip.invflags & (IPT_INV_SRCIP | IPT_INV_DSTIP)))
1794 xtables_error(PARAMETER_PROBLEM, "! not allowed with multiple"
1795 " source or destination IP addresses");
1796
1797 if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1))
1798 xtables_error(PARAMETER_PROBLEM, "Replacement rule does not "
1799 "specify a unique address");
1800
1801 generic_opt_check(command, cs.options);
1802
1803 if (chain != NULL && strlen(chain) >= XT_EXTENSION_MAXNAMELEN)
1804 xtables_error(PARAMETER_PROBLEM,
1805 "chain name `%s' too long (must be under %u chars)",
1806 chain, XT_EXTENSION_MAXNAMELEN);
1807
1808 /* only allocate handle if we weren't called with a handle */
1809 if (!*handle)
1810 *handle = iptc_init(*table);
1811
1812 /* try to insmod the module if iptc_init failed */
1813 if (!*handle && xtables_load_ko(xtables_modprobe_program, false) != -1)
1814 *handle = iptc_init(*table);
1815
1816 if (!*handle)
1817 xtables_error(VERSION_PROBLEM,
1818 "can't initialize iptables table `%s': %s",
1819 *table, iptc_strerror(errno));
1820
1821 if (command == CMD_APPEND
1822 || command == CMD_DELETE
1823 || command == CMD_CHECK
1824 || command == CMD_INSERT
1825 || command == CMD_REPLACE) {
1826 if (strcmp(chain, "PREROUTING") == 0
1827 || strcmp(chain, "INPUT") == 0) {
1828 /* -o not valid with incoming packets. */
1829 if (cs.options & OPT_VIANAMEOUT)
1830 xtables_error(PARAMETER_PROBLEM,
1831 "Can't use -%c with %s\n",
1832 opt2char(OPT_VIANAMEOUT),
1833 chain);
1834 }
1835
1836 if (strcmp(chain, "POSTROUTING") == 0
1837 || strcmp(chain, "OUTPUT") == 0) {
1838 /* -i not valid with outgoing packets */
1839 if (cs.options & OPT_VIANAMEIN)
1840 xtables_error(PARAMETER_PROBLEM,
1841 "Can't use -%c with %s\n",
1842 opt2char(OPT_VIANAMEIN),
1843 chain);
1844 }
1845
1846 if (cs.target && iptc_is_chain(cs.jumpto, *handle)) {
1847 fprintf(stderr,
1848 "Warning: using chain %s, not extension\n",
1849 cs.jumpto);
1850
1851 if (cs.target->t)
1852 free(cs.target->t);
1853
1854 cs.target = NULL;
1855 }
1856
1857 /* If they didn't specify a target, or it's a chain
1858 name, use standard. */
1859 if (!cs.target
1860 && (strlen(cs.jumpto) == 0
1861 || iptc_is_chain(cs.jumpto, *handle))) {
1862 size_t size;
1863
1864 cs.target = xtables_find_target(IPT_STANDARD_TARGET,
1865 XTF_LOAD_MUST_SUCCEED);
1866
1867 size = sizeof(struct ipt_entry_target)
1868 + cs.target->size;
1869 cs.target->t = xtables_calloc(1, size);
1870 cs.target->t->u.target_size = size;
1871 strcpy(cs.target->t->u.user.name, cs.jumpto);
1872 if (!iptc_is_chain(cs.jumpto, *handle))
1873 cs.target->t->u.user.revision = cs.target->revision;
1874 if (cs.target->init != NULL)
1875 cs.target->init(cs.target->t);
1876 }
1877
1878 if (!cs.target) {
1879 /* it is no chain, and we can't load a plugin.
1880 * We cannot know if the plugin is corrupt, non
1881 * existant OR if the user just misspelled a
1882 * chain. */
1883 #ifdef IPT_F_GOTO
1884 if (cs.fw.ip.flags & IPT_F_GOTO)
1885 xtables_error(PARAMETER_PROBLEM,
1886 "goto '%s' is not a chain\n",
1887 cs.jumpto);
1888 #endif
1889 xtables_find_target(cs.jumpto, XTF_LOAD_MUST_SUCCEED);
1890 } else {
1891 e = generate_entry(&cs.fw, cs.matches, cs.target->t);
1892 free(cs.target->t);
1893 }
1894 }
1895
1896 switch (command) {
1897 case CMD_APPEND:
1898 ret = append_entry(chain, e,
1899 nsaddrs, saddrs, smasks,
1900 ndaddrs, daddrs, dmasks,
1901 cs.options&OPT_VERBOSE,
1902 *handle);
1903 break;
1904 case CMD_DELETE:
1905 ret = delete_entry(chain, e,
1906 nsaddrs, saddrs, smasks,
1907 ndaddrs, daddrs, dmasks,
1908 cs.options&OPT_VERBOSE,
1909 *handle, cs.matches, cs.target);
1910 break;
1911 case CMD_DELETE_NUM:
1912 ret = iptc_delete_num_entry(chain, rulenum - 1, *handle);
1913 break;
1914 case CMD_CHECK:
1915 ret = check_entry(chain, e,
1916 nsaddrs, saddrs, smasks,
1917 ndaddrs, daddrs, dmasks,
1918 cs.options&OPT_VERBOSE,
1919 *handle, cs.matches, cs.target);
1920 break;
1921 case CMD_REPLACE:
1922 ret = replace_entry(chain, e, rulenum - 1,
1923 saddrs, smasks, daddrs, dmasks,
1924 cs.options&OPT_VERBOSE, *handle);
1925 break;
1926 case CMD_INSERT:
1927 ret = insert_entry(chain, e, rulenum - 1,
1928 nsaddrs, saddrs, smasks,
1929 ndaddrs, daddrs, dmasks,
1930 cs.options&OPT_VERBOSE,
1931 *handle);
1932 break;
1933 case CMD_FLUSH:
1934 ret = flush_entries4(chain, cs.options&OPT_VERBOSE, *handle);
1935 break;
1936 case CMD_ZERO:
1937 ret = zero_entries(chain, cs.options&OPT_VERBOSE, *handle);
1938 break;
1939 case CMD_ZERO_NUM:
1940 ret = iptc_zero_counter(chain, rulenum, *handle);
1941 break;
1942 case CMD_LIST:
1943 case CMD_LIST|CMD_ZERO:
1944 case CMD_LIST|CMD_ZERO_NUM:
1945 ret = list_entries(chain,
1946 rulenum,
1947 cs.options&OPT_VERBOSE,
1948 cs.options&OPT_NUMERIC,
1949 cs.options&OPT_EXPANDED,
1950 cs.options&OPT_LINENUMBERS,
1951 *handle);
1952 if (ret && (command & CMD_ZERO))
1953 ret = zero_entries(chain,
1954 cs.options&OPT_VERBOSE, *handle);
1955 if (ret && (command & CMD_ZERO_NUM))
1956 ret = iptc_zero_counter(chain, rulenum, *handle);
1957 break;
1958 case CMD_LIST_RULES:
1959 case CMD_LIST_RULES|CMD_ZERO:
1960 case CMD_LIST_RULES|CMD_ZERO_NUM:
1961 ret = list_rules(chain,
1962 rulenum,
1963 cs.options&OPT_VERBOSE,
1964 *handle);
1965 if (ret && (command & CMD_ZERO))
1966 ret = zero_entries(chain,
1967 cs.options&OPT_VERBOSE, *handle);
1968 if (ret && (command & CMD_ZERO_NUM))
1969 ret = iptc_zero_counter(chain, rulenum, *handle);
1970 break;
1971 case CMD_NEW_CHAIN:
1972 ret = iptc_create_chain(chain, *handle);
1973 break;
1974 case CMD_DELETE_CHAIN:
1975 ret = delete_chain4(chain, cs.options&OPT_VERBOSE, *handle);
1976 break;
1977 case CMD_RENAME_CHAIN:
1978 ret = iptc_rename_chain(chain, newname, *handle);
1979 break;
1980 case CMD_SET_POLICY:
1981 ret = iptc_set_policy(chain, policy, cs.options&OPT_COUNTERS ? &cs.fw.counters : NULL, *handle);
1982 break;
1983 default:
1984 /* We should never reach this... */
1985 exit_tryhelp(2);
1986 }
1987
1988 if (verbose > 1)
1989 dump_entries(*handle);
1990
1991 clear_rule_matches(&cs.matches);
1992
1993 if (e != NULL) {
1994 free(e);
1995 e = NULL;
1996 }
1997
1998 free(saddrs);
1999 free(smasks);
2000 free(daddrs);
2001 free(dmasks);
2002 xtables_free_opts(1);
2003
2004 return ret;
2005 }
2006