1 /* Code to take an iptables-style command line and do it. */
4 * Author: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au
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>
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.
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.
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.
50 #ifndef PROC_SYS_MODPROBE
51 #define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe"
54 #define FMT_NUMERIC 0x0001
55 #define FMT_NOCOUNTS 0x0002
56 #define FMT_KILOMEGAGIGA 0x0004
57 #define FMT_OPTIONS 0x0008
58 #define FMT_NOTABLE 0x0010
59 #define FMT_NOTARGET 0x0020
60 #define FMT_VIA 0x0040
61 #define FMT_NONEWLINE 0x0080
62 #define FMT_LINENUMBERS 0x0100
64 #define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \
65 | FMT_NUMERIC | FMT_NOTABLE)
66 #define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (tab))
69 #define CMD_NONE 0x0000U
70 #define CMD_INSERT 0x0001U
71 #define CMD_DELETE 0x0002U
72 #define CMD_DELETE_NUM 0x0004U
73 #define CMD_REPLACE 0x0008U
74 #define CMD_APPEND 0x0010U
75 #define CMD_LIST 0x0020U
76 #define CMD_FLUSH 0x0040U
77 #define CMD_ZERO 0x0080U
78 #define CMD_NEW_CHAIN 0x0100U
79 #define CMD_DELETE_CHAIN 0x0200U
80 #define CMD_SET_POLICY 0x0400U
81 #define CMD_CHECK 0x0800U
82 #define CMD_RENAME_CHAIN 0x1000U
83 #define NUMBER_OF_CMD 13
84 static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z',
87 #define OPTION_OFFSET 256
89 #define OPT_NONE 0x00000U
90 #define OPT_NUMERIC 0x00001U
91 #define OPT_SOURCE 0x00002U
92 #define OPT_DESTINATION 0x00004U
93 #define OPT_PROTOCOL 0x00008U
94 #define OPT_JUMP 0x00010U
95 #define OPT_VERBOSE 0x00020U
96 #define OPT_EXPANDED 0x00040U
97 #define OPT_VIANAMEIN 0x00080U
98 #define OPT_VIANAMEOUT 0x00100U
99 #define OPT_FRAGMENT 0x00200U
100 #define OPT_LINENUMBERS 0x00400U
101 #define OPT_COUNTERS 0x00800U
102 #define NUMBER_OF_OPT 12
103 static const char optflags[NUMBER_OF_OPT]
104 = { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', 'f', '0', 'c'};
106 static struct option original_opts[] = {
107 { "append", 1, 0, 'A' },
108 { "delete", 1, 0, 'D' },
109 { "insert", 1, 0, 'I' },
110 { "replace", 1, 0, 'R' },
111 { "list", 2, 0, 'L' },
112 { "flush", 2, 0, 'F' },
113 { "zero", 2, 0, 'Z' },
114 { "new-chain", 1, 0, 'N' },
115 { "delete-chain", 2, 0, 'X' },
116 { "rename-chain", 1, 0, 'E' },
117 { "policy", 1, 0, 'P' },
118 { "source", 1, 0, 's' },
119 { "destination", 1, 0, 'd' },
120 { "src", 1, 0, 's' }, /* synonym */
121 { "dst", 1, 0, 'd' }, /* synonym */
122 { "protocol", 1, 0, 'p' },
123 { "in-interface", 1, 0, 'i' },
124 { "jump", 1, 0, 'j' },
125 { "table", 1, 0, 't' },
126 { "match", 1, 0, 'm' },
127 { "numeric", 0, 0, 'n' },
128 { "out-interface", 1, 0, 'o' },
129 { "verbose", 0, 0, 'v' },
130 { "exact", 0, 0, 'x' },
131 { "fragments", 0, 0, 'f' },
132 { "version", 0, 0, 'V' },
133 { "help", 2, 0, 'h' },
134 { "line-numbers", 0, 0, '0' },
135 { "modprobe", 1, 0, 'M' },
136 { "set-counters", 1, 0, 'c' },
140 /* we need this for iptables-restore. iptables-restore.c sets line to the
141 * current line of the input file, in order to give a more precise error
142 * message. iptables itself doesn't need this, so it is initialized to the
143 * magic number of -1 */
146 static struct option *opts = original_opts;
147 static unsigned int global_option_offset = 0;
149 /* Table of legal combinations of commands and options. If any of the
150 * given commands make an option legal, that option is legal (applies to
151 * CMD_LIST and CMD_ZERO only).
158 static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
159 /* Well, it's better than "Re: Linux vs FreeBSD" */
161 /* -n -s -d -p -j -v -x -i -o -f --line */
162 /*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'},
163 /*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'},
164 /*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x'},
165 /*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'},
166 /*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x'},
167 /*LIST*/ {' ','x','x','x','x',' ',' ','x','x','x',' '},
168 /*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
169 /*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
170 /*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
171 /*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
172 /*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x','x'},
173 /*CHECK*/ {'x','+','+','+','x',' ','x',' ',' ',' ','x'},
174 /*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x'}
177 static int inverse_for_options[NUMBER_OF_OPT] =
180 /* -s */ IPT_INV_SRCIP,
181 /* -d */ IPT_INV_DSTIP,
182 /* -p */ IPT_INV_PROTO,
186 /* -i */ IPT_INV_VIA_IN,
187 /* -o */ IPT_INV_VIA_OUT,
188 /* -f */ IPT_INV_FRAG,
192 const char *program_version;
193 const char *program_name;
196 /* Keeping track of external matches and targets: linked lists. */
197 struct iptables_match *iptables_matches = NULL;
198 struct iptables_target *iptables_targets = NULL;
200 /* Extra debugging from libiptc */
201 extern void dump_entries(const iptc_handle_t handle);
203 /* A few hardcoded protocols for 'all' and in case the user has no
210 /* Primitive headers... */
211 /* defined in netinet/in.h */
214 #define IPPROTO_ESP 50
217 #define IPPROTO_AH 51
221 static const struct pprot chain_protos[] = {
222 { "tcp", IPPROTO_TCP },
223 { "udp", IPPROTO_UDP },
224 { "icmp", IPPROTO_ICMP },
225 { "esp", IPPROTO_ESP },
226 { "ah", IPPROTO_AH },
227 { "sctp", IPPROTO_SCTP },
232 proto_to_name(u_int8_t proto, int nolookup)
236 if (proto && !nolookup) {
237 struct protoent *pent = getprotobynumber(proto);
242 for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++)
243 if (chain_protos[i].num == proto)
244 return chain_protos[i].name;
250 dotted_to_addr(const char *dotted)
252 static struct in_addr addr;
253 unsigned char *addrp;
255 unsigned int onebyte;
259 /* copy dotted string, because we need to modify it */
260 strncpy(buf, dotted, sizeof(buf) - 1);
261 buf[sizeof(buf) - 1] = '\0';
262 addrp = (unsigned char *) &(addr.s_addr);
265 for (i = 0; i < 3; i++) {
266 if ((q = strchr(p, '.')) == NULL)
267 return (struct in_addr *) NULL;
270 if (string_to_number(p, 0, 255, &onebyte) == -1)
271 return (struct in_addr *) NULL;
273 addrp[i] = (unsigned char) onebyte;
277 /* we've checked 3 bytes, now we check the last one */
278 if (string_to_number(p, 0, 255, &onebyte) == -1)
279 return (struct in_addr *) NULL;
281 addrp[3] = (unsigned char) onebyte;
286 static struct in_addr *
287 network_to_addr(const char *name)
290 static struct in_addr addr;
292 if ((net = getnetbyname(name)) != NULL) {
293 if (net->n_addrtype != AF_INET)
294 return (struct in_addr *) NULL;
295 addr.s_addr = htonl((unsigned long) net->n_net);
299 return (struct in_addr *) NULL;
303 inaddrcpy(struct in_addr *dst, struct in_addr *src)
305 /* memcpy(dst, src, sizeof(struct in_addr)); */
306 dst->s_addr = src->s_addr;
309 static void free_opts(int reset_offset)
311 if (opts != original_opts) {
313 opts = original_opts;
315 global_option_offset = 0;
320 exit_error(enum exittype status, char *msg, ...)
325 fprintf(stderr, "%s v%s: ", program_name, program_version);
326 vfprintf(stderr, msg, args);
328 fprintf(stderr, "\n");
329 if (status == PARAMETER_PROBLEM)
330 exit_tryhelp(status);
331 if (status == VERSION_PROBLEM)
333 "Perhaps iptables or your kernel needs to be upgraded.\n");
334 /* On error paths, make sure that we don't leak memory */
340 exit_tryhelp(int status)
343 fprintf(stderr, "Error occurred at line: %d\n", line);
344 fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
345 program_name, program_name );
351 exit_printhelp(struct iptables_rule_match *matches)
353 struct iptables_rule_match *matchp = NULL;
354 struct iptables_target *t = NULL;
357 "Usage: %s -[AD] chain rule-specification [options]\n"
358 " %s -[RI] chain rulenum rule-specification [options]\n"
359 " %s -D chain rulenum [options]\n"
360 " %s -[LFZ] [chain] [options]\n"
362 " %s -E old-chain-name new-chain-name\n"
363 " %s -P chain target [options]\n"
364 " %s -h (print this help information)\n\n",
365 program_name, program_version, program_name, program_name,
366 program_name, program_name, program_name, program_name,
367 program_name, program_name);
371 "Either long or short options are allowed.\n"
372 " --append -A chain Append to chain\n"
373 " --delete -D chain Delete matching rule from chain\n"
374 " --delete -D chain rulenum\n"
375 " Delete rule rulenum (1 = first) from chain\n"
376 " --insert -I chain [rulenum]\n"
377 " Insert in chain as rulenum (default 1=first)\n"
378 " --replace -R chain rulenum\n"
379 " Replace rule rulenum (1 = first) in chain\n"
380 " --list -L [chain] List the rules in a chain or all chains\n"
381 " --flush -F [chain] Delete all rules in chain or all chains\n"
382 " --zero -Z [chain] Zero counters in chain or all chains\n"
383 " --new -N chain Create a new user-defined chain\n"
385 " -X [chain] Delete a user-defined chain\n"
386 " --policy -P chain target\n"
387 " Change policy on chain to target\n"
389 " -E old-chain new-chain\n"
390 " Change chain name, (moving any references)\n"
393 " --proto -p [!] proto protocol: by number or name, eg. `tcp'\n"
394 " --source -s [!] address[/mask]\n"
395 " source specification\n"
396 " --destination -d [!] address[/mask]\n"
397 " destination specification\n"
398 " --in-interface -i [!] input name[+]\n"
399 " network interface name ([+] for wildcard)\n"
400 " --jump -j target\n"
401 " target for rule (may load target extension)\n"
402 " --match -m match\n"
403 " extended match (may load extension)\n"
404 " --numeric -n numeric output of addresses and ports\n"
405 " --out-interface -o [!] output name[+]\n"
406 " network interface name ([+] for wildcard)\n"
407 " --table -t table table to manipulate (default: `filter')\n"
408 " --verbose -v verbose mode\n"
409 " --line-numbers print line numbers when listing\n"
410 " --exact -x expand numbers (display exact values)\n"
411 "[!] --fragment -f match second or further fragments only\n"
412 " --modprobe=<command> try to insert modules using this command\n"
413 " --set-counters PKTS BYTES set the counter during insert/append\n"
414 "[!] --version -V print package version.\n");
416 /* Print out any special helps. A user might like to be able
417 to add a --help to the commandline, and see expected
418 results. So we call help for all specified matches & targets */
419 for (t = iptables_targets; t ;t = t->next) {
425 for (matchp = matches; matchp; matchp = matchp->next) {
427 matchp->match->help();
433 generic_opt_check(int command, int options)
437 /* Check that commands are valid with options. Complicated by the
438 * fact that if an option is legal with *any* command given, it is
439 * legal overall (ie. -z and -l).
441 for (i = 0; i < NUMBER_OF_OPT; i++) {
442 legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */
444 for (j = 0; j < NUMBER_OF_CMD; j++) {
445 if (!(command & (1<<j)))
448 if (!(options & (1<<i))) {
449 if (commands_v_options[j][i] == '+')
450 exit_error(PARAMETER_PROBLEM,
451 "You need to supply the `-%c' "
452 "option for this command\n",
455 if (commands_v_options[j][i] != 'x')
462 exit_error(PARAMETER_PROBLEM,
463 "Illegal option `-%c' with this command\n",
472 for (ptr = optflags; option > 1; option >>= 1, ptr++);
481 for (ptr = cmdflags; option > 1; option >>= 1, ptr++);
487 add_command(int *cmd, const int newcmd, const int othercmds, int invert)
490 exit_error(PARAMETER_PROBLEM, "unexpected ! flag");
491 if (*cmd & (~othercmds))
492 exit_error(PARAMETER_PROBLEM, "Can't use -%c with -%c\n",
493 cmd2char(newcmd), cmd2char(*cmd & (~othercmds)));
498 check_inverse(const char option[], int *invert, int *optind, int argc)
500 if (option && strcmp(option, "!") == 0) {
502 exit_error(PARAMETER_PROBLEM,
503 "Multiple `!' flags not allowed");
507 if (argc && *optind > argc)
508 exit_error(PARAMETER_PROBLEM,
509 "no argument following `!'");
518 fw_calloc(size_t count, size_t size)
522 if ((p = calloc(count, size)) == NULL) {
523 perror("iptables: calloc failed");
530 fw_malloc(size_t size)
534 if ((p = malloc(size)) == NULL) {
535 perror("iptables: malloc failed");
541 static struct in_addr *
542 host_to_addr(const char *name, unsigned int *naddr)
544 struct hostent *host;
545 struct in_addr *addr;
549 if ((host = gethostbyname(name)) != NULL) {
550 if (host->h_addrtype != AF_INET ||
551 host->h_length != sizeof(struct in_addr))
552 return (struct in_addr *) NULL;
554 while (host->h_addr_list[*naddr] != (char *) NULL)
556 addr = fw_calloc(*naddr, sizeof(struct in_addr) * *naddr);
557 for (i = 0; i < *naddr; i++)
558 inaddrcpy(&(addr[i]),
559 (struct in_addr *) host->h_addr_list[i]);
563 return (struct in_addr *) NULL;
567 addr_to_host(const struct in_addr *addr)
569 struct hostent *host;
571 if ((host = gethostbyaddr((char *) addr,
572 sizeof(struct in_addr), AF_INET)) != NULL)
573 return (char *) host->h_name;
575 return (char *) NULL;
579 * All functions starting with "parse" should succeed, otherwise
581 * Most routines return pointers to static data that may change
582 * between calls to the same or other routines with a few exceptions:
583 * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask"
584 * return global static data.
587 static struct in_addr *
588 parse_hostnetwork(const char *name, unsigned int *naddrs)
590 struct in_addr *addrp, *addrptmp;
592 if ((addrptmp = dotted_to_addr(name)) != NULL ||
593 (addrptmp = network_to_addr(name)) != NULL) {
594 addrp = fw_malloc(sizeof(struct in_addr));
595 inaddrcpy(addrp, addrptmp);
599 if ((addrp = host_to_addr(name, naddrs)) != NULL)
602 exit_error(PARAMETER_PROBLEM, "host/network `%s' not found", name);
605 static struct in_addr *
606 parse_mask(char *mask)
608 static struct in_addr maskaddr;
609 struct in_addr *addrp;
613 /* no mask at all defaults to 32 bits */
614 maskaddr.s_addr = 0xFFFFFFFF;
617 if ((addrp = dotted_to_addr(mask)) != NULL)
618 /* dotted_to_addr already returns a network byte order addr */
620 if (string_to_number(mask, 0, 32, &bits) == -1)
621 exit_error(PARAMETER_PROBLEM,
622 "invalid mask `%s' specified", mask);
624 maskaddr.s_addr = htonl(0xFFFFFFFF << (32 - bits));
628 maskaddr.s_addr = 0L;
633 parse_hostnetworkmask(const char *name, struct in_addr **addrpp,
634 struct in_addr *maskp, unsigned int *naddrs)
636 struct in_addr *addrp;
641 strncpy(buf, name, sizeof(buf) - 1);
642 buf[sizeof(buf) - 1] = '\0';
643 if ((p = strrchr(buf, '/')) != NULL) {
645 addrp = parse_mask(p + 1);
647 addrp = parse_mask(NULL);
648 inaddrcpy(maskp, addrp);
650 /* if a null mask is given, the name is ignored, like in "any/0" */
651 if (maskp->s_addr == 0L)
652 strcpy(buf, "0.0.0.0");
654 addrp = *addrpp = parse_hostnetwork(buf, naddrs);
656 for (i = 0, j = 0; i < n; i++) {
657 addrp[j++].s_addr &= maskp->s_addr;
658 for (k = 0; k < j - 1; k++) {
659 if (addrp[k].s_addr == addrp[j - 1].s_addr) {
668 struct iptables_match *
669 find_match(const char *name, enum ipt_tryload tryload, struct iptables_rule_match **matches)
671 struct iptables_match *ptr;
673 for (ptr = iptables_matches; ptr; ptr = ptr->next) {
674 if (strcmp(name, ptr->name) == 0)
678 #ifndef NO_SHARED_LIBS
679 if (!ptr && tryload != DONT_LOAD) {
680 char path[strlen(lib_dir) + sizeof("/libipt_.so")
682 sprintf(path, "%s/libipt_%s.so", lib_dir, name);
683 if (dlopen(path, RTLD_NOW)) {
684 /* Found library. If it didn't register itself,
685 maybe they specified target as match. */
686 ptr = find_match(name, DONT_LOAD, NULL);
689 exit_error(PARAMETER_PROBLEM,
690 "Couldn't load match `%s'\n",
692 } else if (tryload == LOAD_MUST_SUCCEED)
693 exit_error(PARAMETER_PROBLEM,
694 "Couldn't load match `%s':%s\n",
698 if (ptr && !ptr->loaded) {
699 if (tryload != DONT_LOAD)
704 if(!ptr && (tryload == LOAD_MUST_SUCCEED)) {
705 exit_error(PARAMETER_PROBLEM,
706 "Couldn't find match `%s'\n", name);
710 if (ptr && matches) {
711 struct iptables_rule_match **i;
712 struct iptables_rule_match *newentry;
714 newentry = fw_malloc(sizeof(struct iptables_rule_match));
716 for (i = matches; *i; i = &(*i)->next);
717 newentry->match = ptr;
718 newentry->next = NULL;
725 /* Christophe Burki wants `-p 6' to imply `-m tcp'. */
726 static struct iptables_match *
727 find_proto(const char *pname, enum ipt_tryload tryload, int nolookup, struct iptables_rule_match **matches)
731 if (string_to_number(pname, 0, 255, &proto) != -1) {
732 char *protoname = proto_to_name(proto, nolookup);
735 return find_match(protoname, tryload, matches);
737 return find_match(pname, tryload, matches);
743 parse_protocol(const char *s)
747 if (string_to_number(s, 0, 255, &proto) == -1) {
748 struct protoent *pent;
750 if ((pent = getprotobyname(s)))
751 proto = pent->p_proto;
755 i < sizeof(chain_protos)/sizeof(struct pprot);
757 if (strcmp(s, chain_protos[i].name) == 0) {
758 proto = chain_protos[i].num;
762 if (i == sizeof(chain_protos)/sizeof(struct pprot))
763 exit_error(PARAMETER_PROBLEM,
764 "unknown protocol `%s' specified",
769 return (u_int16_t)proto;
772 void parse_interface(const char *arg, char *vianame, unsigned char *mask)
774 int vialen = strlen(arg);
777 memset(mask, 0, IFNAMSIZ);
778 memset(vianame, 0, IFNAMSIZ);
780 if (vialen + 1 > IFNAMSIZ)
781 exit_error(PARAMETER_PROBLEM,
782 "interface name `%s' must be shorter than IFNAMSIZ"
783 " (%i)", arg, IFNAMSIZ-1);
785 strcpy(vianame, arg);
786 if ((vialen == 0) || (vialen == 1 && vianame[0] == '+'))
787 memset(mask, 0, IFNAMSIZ);
788 else if (vianame[vialen - 1] == '+') {
789 memset(mask, 0xFF, vialen - 1);
790 memset(mask + vialen - 1, 0, IFNAMSIZ - vialen + 1);
791 /* Don't remove `+' here! -HW */
793 /* Include nul-terminator in match */
794 memset(mask, 0xFF, vialen + 1);
795 memset(mask + vialen + 1, 0, IFNAMSIZ - vialen - 1);
796 for (i = 0; vianame[i]; i++) {
797 if (!isalnum(vianame[i])
799 && vianame[i] != '.') {
800 printf("Warning: wierd character in interface"
801 " `%s' (No aliases, :, ! or *).\n",
811 parse_rulenumber(const char *rule)
813 unsigned int rulenum;
815 if (string_to_number(rule, 1, INT_MAX, &rulenum) == -1)
816 exit_error(PARAMETER_PROBLEM,
817 "Invalid rule number `%s'", rule);
823 parse_target(const char *targetname)
827 if (strlen(targetname) < 1)
828 exit_error(PARAMETER_PROBLEM,
829 "Invalid target name (too short)");
831 if (strlen(targetname)+1 > sizeof(ipt_chainlabel))
832 exit_error(PARAMETER_PROBLEM,
833 "Invalid target name `%s' (%u chars max)",
834 targetname, (unsigned int)sizeof(ipt_chainlabel)-1);
836 for (ptr = targetname; *ptr; ptr++)
838 exit_error(PARAMETER_PROBLEM,
839 "Invalid target name `%s'", targetname);
844 addr_to_network(const struct in_addr *addr)
848 if ((net = getnetbyaddr((long) ntohl(addr->s_addr), AF_INET)) != NULL)
849 return (char *) net->n_name;
851 return (char *) NULL;
855 addr_to_dotted(const struct in_addr *addrp)
858 const unsigned char *bytep;
860 bytep = (const unsigned char *) &(addrp->s_addr);
861 sprintf(buf, "%d.%d.%d.%d", bytep[0], bytep[1], bytep[2], bytep[3]);
866 addr_to_anyname(const struct in_addr *addr)
870 if ((name = addr_to_host(addr)) != NULL ||
871 (name = addr_to_network(addr)) != NULL)
874 return addr_to_dotted(addr);
878 mask_to_dotted(const struct in_addr *mask)
882 u_int32_t maskaddr, bits;
884 maskaddr = ntohl(mask->s_addr);
886 if (maskaddr == 0xFFFFFFFFL)
887 /* we don't want to see "/32" */
892 while (--i >= 0 && maskaddr != bits)
895 sprintf(buf, "/%d", i);
897 /* mask was not a decent combination of 1's and 0's */
898 sprintf(buf, "/%s", addr_to_dotted(mask));
904 string_to_number_ll(const char *s, unsigned long long min, unsigned long long max,
905 unsigned long long *ret)
907 unsigned long long number;
910 /* Handle hex, octal, etc. */
912 number = strtoull(s, &end, 0);
913 if (*end == '\0' && end != s) {
914 /* we parsed a number, let's see if we want this */
915 if (errno != ERANGE && min <= number && (!max || number <= max)) {
924 string_to_number_l(const char *s, unsigned long min, unsigned long max,
928 unsigned long long number;
930 result = string_to_number_ll(s, min, max, &number);
931 *ret = (unsigned long)number;
936 int string_to_number(const char *s, unsigned int min, unsigned int max,
940 unsigned long number;
942 result = string_to_number_l(s, min, max, &number);
943 *ret = (unsigned int)number;
949 set_option(unsigned int *options, unsigned int option, u_int8_t *invflg,
952 if (*options & option)
953 exit_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed",
959 for (i = 0; 1 << i != option; i++);
961 if (!inverse_for_options[i])
962 exit_error(PARAMETER_PROBLEM,
963 "cannot have ! before -%c",
965 *invflg |= inverse_for_options[i];
969 struct iptables_target *
970 find_target(const char *name, enum ipt_tryload tryload)
972 struct iptables_target *ptr;
974 /* Standard target? */
975 if (strcmp(name, "") == 0
976 || strcmp(name, IPTC_LABEL_ACCEPT) == 0
977 || strcmp(name, IPTC_LABEL_DROP) == 0
978 || strcmp(name, IPTC_LABEL_QUEUE) == 0
979 || strcmp(name, IPTC_LABEL_RETURN) == 0)
982 for (ptr = iptables_targets; ptr; ptr = ptr->next) {
983 if (strcmp(name, ptr->name) == 0)
987 #ifndef NO_SHARED_LIBS
988 if (!ptr && tryload != DONT_LOAD) {
989 char path[strlen(lib_dir) + sizeof("/libipt_.so")
991 sprintf(path, "%s/libipt_%s.so", lib_dir, name);
992 if (dlopen(path, RTLD_NOW)) {
993 /* Found library. If it didn't register itself,
994 maybe they specified match as a target. */
995 ptr = find_target(name, DONT_LOAD);
997 exit_error(PARAMETER_PROBLEM,
998 "Couldn't load target `%s'\n",
1000 } else if (tryload == LOAD_MUST_SUCCEED)
1001 exit_error(PARAMETER_PROBLEM,
1002 "Couldn't load target `%s':%s\n",
1006 if (ptr && !ptr->loaded) {
1007 if (tryload != DONT_LOAD)
1012 if(!ptr && (tryload == LOAD_MUST_SUCCEED)) {
1013 exit_error(PARAMETER_PROBLEM,
1014 "Couldn't find target `%s'\n", name);
1024 static struct option *
1025 merge_options(struct option *oldopts, const struct option *newopts,
1026 unsigned int *option_offset)
1028 unsigned int num_old, num_new, i;
1029 struct option *merge;
1031 /* Release previous options merged if any */
1034 for (num_old = 0; oldopts[num_old].name; num_old++);
1035 for (num_new = 0; newopts[num_new].name; num_new++);
1037 global_option_offset += OPTION_OFFSET;
1038 *option_offset = global_option_offset;
1040 merge = malloc(sizeof(struct option) * (num_new + num_old + 1));
1041 memcpy(merge, oldopts, num_old * sizeof(struct option));
1042 for (i = 0; i < num_new; i++) {
1043 merge[num_old + i] = newopts[i];
1044 merge[num_old + i].val += *option_offset;
1046 memset(merge + num_old + num_new, 0, sizeof(struct option));
1051 static int compatible_revision(const char *name, u_int8_t revision, int opt)
1053 struct ipt_get_revision rev;
1054 socklen_t s = sizeof(rev);
1055 int max_rev, sockfd;
1057 sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
1059 fprintf(stderr, "Could not open socket to kernel: %s\n",
1064 strcpy(rev.name, name);
1065 rev.revision = revision;
1067 max_rev = getsockopt(sockfd, IPPROTO_IP, opt, &rev, &s);
1069 /* Definitely don't support this? */
1070 if (errno == EPROTONOSUPPORT) {
1073 } else if (errno == ENOPROTOOPT) {
1075 /* Assume only revision 0 support (old kernel) */
1076 return (revision == 0);
1078 fprintf(stderr, "getsockopt failed strangely: %s\n",
1087 static int compatible_match_revision(const char *name, u_int8_t revision)
1089 return compatible_revision(name, revision, IPT_SO_GET_REVISION_MATCH);
1092 static int compatible_target_revision(const char *name, u_int8_t revision)
1094 return compatible_revision(name, revision, IPT_SO_GET_REVISION_TARGET);
1098 register_match(struct iptables_match *me)
1100 struct iptables_match **i, *old;
1102 if (strcmp(me->version, program_version) != 0) {
1103 fprintf(stderr, "%s: match `%s' v%s (I'm v%s).\n",
1104 program_name, me->name, me->version, program_version);
1108 /* Revision field stole a char from name. */
1109 if (strlen(me->name) >= IPT_FUNCTION_MAXNAMELEN-1) {
1110 fprintf(stderr, "%s: target `%s' has invalid name\n",
1111 program_name, me->name);
1115 old = find_match(me->name, DONT_LOAD, NULL);
1117 if (old->revision == me->revision) {
1119 "%s: match `%s' already registered.\n",
1120 program_name, me->name);
1124 /* Now we have two (or more) options, check compatibility. */
1125 if (compatible_match_revision(old->name, old->revision)
1126 && old->revision > me->revision)
1129 /* Replace if compatible. */
1130 if (!compatible_match_revision(me->name, me->revision))
1133 /* Delete old one. */
1134 for (i = &iptables_matches; *i!=old; i = &(*i)->next);
1138 if (me->size != IPT_ALIGN(me->size)) {
1139 fprintf(stderr, "%s: match `%s' has invalid size %u.\n",
1140 program_name, me->name, (unsigned int)me->size);
1144 /* Append to list. */
1145 for (i = &iptables_matches; *i; i = &(*i)->next);
1154 register_target(struct iptables_target *me)
1156 struct iptables_target *old;
1158 if (strcmp(me->version, program_version) != 0) {
1159 fprintf(stderr, "%s: target `%s' v%s (I'm v%s).\n",
1160 program_name, me->name, me->version, program_version);
1164 /* Revision field stole a char from name. */
1165 if (strlen(me->name) >= IPT_FUNCTION_MAXNAMELEN-1) {
1166 fprintf(stderr, "%s: target `%s' has invalid name\n",
1167 program_name, me->name);
1171 old = find_target(me->name, DONT_LOAD);
1173 struct iptables_target **i;
1175 if (old->revision == me->revision) {
1177 "%s: target `%s' already registered.\n",
1178 program_name, me->name);
1182 /* Now we have two (or more) options, check compatibility. */
1183 if (compatible_target_revision(old->name, old->revision)
1184 && old->revision > me->revision)
1187 /* Replace if compatible. */
1188 if (!compatible_target_revision(me->name, me->revision))
1191 /* Delete old one. */
1192 for (i = &iptables_targets; *i!=old; i = &(*i)->next);
1196 if (me->size != IPT_ALIGN(me->size)) {
1197 fprintf(stderr, "%s: target `%s' has invalid size %u.\n",
1198 program_name, me->name, (unsigned int)me->size);
1202 /* Prepend to list. */
1203 me->next = iptables_targets;
1204 iptables_targets = me;
1210 print_num(u_int64_t number, unsigned int format)
1212 if (format & FMT_KILOMEGAGIGA) {
1213 if (number > 99999) {
1214 number = (number + 500) / 1000;
1215 if (number > 9999) {
1216 number = (number + 500) / 1000;
1217 if (number > 9999) {
1218 number = (number + 500) / 1000;
1219 if (number > 9999) {
1220 number = (number + 500) / 1000;
1221 printf(FMT("%4lluT ","%lluT "), (unsigned long long)number);
1223 else printf(FMT("%4lluG ","%lluG "), (unsigned long long)number);
1225 else printf(FMT("%4lluM ","%lluM "), (unsigned long long)number);
1227 printf(FMT("%4lluK ","%lluK "), (unsigned long long)number);
1229 printf(FMT("%5llu ","%llu "), (unsigned long long)number);
1231 printf(FMT("%8llu ","%llu "), (unsigned long long)number);
1236 print_header(unsigned int format, const char *chain, iptc_handle_t *handle)
1238 struct ipt_counters counters;
1239 const char *pol = iptc_get_policy(chain, &counters, handle);
1240 printf("Chain %s", chain);
1242 printf(" (policy %s", pol);
1243 if (!(format & FMT_NOCOUNTS)) {
1245 print_num(counters.pcnt, (format|FMT_NOTABLE));
1246 fputs("packets, ", stdout);
1247 print_num(counters.bcnt, (format|FMT_NOTABLE));
1248 fputs("bytes", stdout);
1253 if (!iptc_get_references(&refs, chain, handle))
1254 printf(" (ERROR obtaining refs)\n");
1256 printf(" (%u references)\n", refs);
1259 if (format & FMT_LINENUMBERS)
1260 printf(FMT("%-4s ", "%s "), "num");
1261 if (!(format & FMT_NOCOUNTS)) {
1262 if (format & FMT_KILOMEGAGIGA) {
1263 printf(FMT("%5s ","%s "), "pkts");
1264 printf(FMT("%5s ","%s "), "bytes");
1266 printf(FMT("%8s ","%s "), "pkts");
1267 printf(FMT("%10s ","%s "), "bytes");
1270 if (!(format & FMT_NOTARGET))
1271 printf(FMT("%-9s ","%s "), "target");
1272 fputs(" prot ", stdout);
1273 if (format & FMT_OPTIONS)
1274 fputs("opt", stdout);
1275 if (format & FMT_VIA) {
1276 printf(FMT(" %-6s ","%s "), "in");
1277 printf(FMT("%-6s ","%s "), "out");
1279 printf(FMT(" %-19s ","%s "), "source");
1280 printf(FMT(" %-19s "," %s "), "destination");
1286 print_match(const struct ipt_entry_match *m,
1287 const struct ipt_ip *ip,
1290 struct iptables_match *match = find_match(m->u.user.name, TRY_LOAD, NULL);
1294 match->print(ip, m, numeric);
1296 printf("%s ", match->name);
1298 if (m->u.user.name[0])
1299 printf("UNKNOWN match `%s' ", m->u.user.name);
1301 /* Don't stop iterating. */
1305 /* e is called `fw' here for hysterical raisins */
1307 print_firewall(const struct ipt_entry *fw,
1308 const char *targname,
1310 unsigned int format,
1311 const iptc_handle_t handle)
1313 struct iptables_target *target = NULL;
1314 const struct ipt_entry_target *t;
1318 if (!iptc_is_chain(targname, handle))
1319 target = find_target(targname, TRY_LOAD);
1321 target = find_target(IPT_STANDARD_TARGET, LOAD_MUST_SUCCEED);
1323 t = ipt_get_target((struct ipt_entry *)fw);
1324 flags = fw->ip.flags;
1326 if (format & FMT_LINENUMBERS)
1327 printf(FMT("%-4u ", "%u "), num+1);
1329 if (!(format & FMT_NOCOUNTS)) {
1330 print_num(fw->counters.pcnt, format);
1331 print_num(fw->counters.bcnt, format);
1334 if (!(format & FMT_NOTARGET))
1335 printf(FMT("%-9s ", "%s "), targname);
1337 fputc(fw->ip.invflags & IPT_INV_PROTO ? '!' : ' ', stdout);
1339 char *pname = proto_to_name(fw->ip.proto, format&FMT_NUMERIC);
1341 printf(FMT("%-5s", "%s "), pname);
1343 printf(FMT("%-5hu", "%hu "), fw->ip.proto);
1346 if (format & FMT_OPTIONS) {
1347 if (format & FMT_NOTABLE)
1348 fputs("opt ", stdout);
1349 fputc(fw->ip.invflags & IPT_INV_FRAG ? '!' : '-', stdout);
1350 fputc(flags & IPT_F_FRAG ? 'f' : '-', stdout);
1354 if (format & FMT_VIA) {
1355 char iface[IFNAMSIZ+2];
1357 if (fw->ip.invflags & IPT_INV_VIA_IN) {
1361 else iface[0] = '\0';
1363 if (fw->ip.iniface[0] != '\0') {
1364 strcat(iface, fw->ip.iniface);
1366 else if (format & FMT_NUMERIC) strcat(iface, "*");
1367 else strcat(iface, "any");
1368 printf(FMT(" %-6s ","in %s "), iface);
1370 if (fw->ip.invflags & IPT_INV_VIA_OUT) {
1374 else iface[0] = '\0';
1376 if (fw->ip.outiface[0] != '\0') {
1377 strcat(iface, fw->ip.outiface);
1379 else if (format & FMT_NUMERIC) strcat(iface, "*");
1380 else strcat(iface, "any");
1381 printf(FMT("%-6s ","out %s "), iface);
1384 fputc(fw->ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout);
1385 if (fw->ip.smsk.s_addr == 0L && !(format & FMT_NUMERIC))
1386 printf(FMT("%-19s ","%s "), "anywhere");
1388 if (format & FMT_NUMERIC)
1389 sprintf(buf, "%s", addr_to_dotted(&(fw->ip.src)));
1391 sprintf(buf, "%s", addr_to_anyname(&(fw->ip.src)));
1392 strcat(buf, mask_to_dotted(&(fw->ip.smsk)));
1393 printf(FMT("%-19s ","%s "), buf);
1396 fputc(fw->ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout);
1397 if (fw->ip.dmsk.s_addr == 0L && !(format & FMT_NUMERIC))
1398 printf(FMT("%-19s ","-> %s"), "anywhere");
1400 if (format & FMT_NUMERIC)
1401 sprintf(buf, "%s", addr_to_dotted(&(fw->ip.dst)));
1403 sprintf(buf, "%s", addr_to_anyname(&(fw->ip.dst)));
1404 strcat(buf, mask_to_dotted(&(fw->ip.dmsk)));
1405 printf(FMT("%-19s ","-> %s"), buf);
1408 if (format & FMT_NOTABLE)
1411 IPT_MATCH_ITERATE(fw, print_match, &fw->ip, format & FMT_NUMERIC);
1415 /* Print the target information. */
1416 target->print(&fw->ip, t, format & FMT_NUMERIC);
1417 } else if (t->u.target_size != sizeof(*t))
1418 printf("[%u bytes of unknown target data] ",
1419 (unsigned int)(t->u.target_size - sizeof(*t)));
1421 if (!(format & FMT_NONEWLINE))
1422 fputc('\n', stdout);
1426 print_firewall_line(const struct ipt_entry *fw,
1427 const iptc_handle_t h)
1429 struct ipt_entry_target *t;
1431 t = ipt_get_target((struct ipt_entry *)fw);
1432 print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h);
1436 append_entry(const ipt_chainlabel chain,
1437 struct ipt_entry *fw,
1438 unsigned int nsaddrs,
1439 const struct in_addr saddrs[],
1440 unsigned int ndaddrs,
1441 const struct in_addr daddrs[],
1443 iptc_handle_t *handle)
1448 for (i = 0; i < nsaddrs; i++) {
1449 fw->ip.src.s_addr = saddrs[i].s_addr;
1450 for (j = 0; j < ndaddrs; j++) {
1451 fw->ip.dst.s_addr = daddrs[j].s_addr;
1453 print_firewall_line(fw, *handle);
1454 ret &= iptc_append_entry(chain, fw, handle);
1462 replace_entry(const ipt_chainlabel chain,
1463 struct ipt_entry *fw,
1464 unsigned int rulenum,
1465 const struct in_addr *saddr,
1466 const struct in_addr *daddr,
1468 iptc_handle_t *handle)
1470 fw->ip.src.s_addr = saddr->s_addr;
1471 fw->ip.dst.s_addr = daddr->s_addr;
1474 print_firewall_line(fw, *handle);
1475 return iptc_replace_entry(chain, fw, rulenum, handle);
1479 insert_entry(const ipt_chainlabel chain,
1480 struct ipt_entry *fw,
1481 unsigned int rulenum,
1482 unsigned int nsaddrs,
1483 const struct in_addr saddrs[],
1484 unsigned int ndaddrs,
1485 const struct in_addr daddrs[],
1487 iptc_handle_t *handle)
1492 for (i = 0; i < nsaddrs; i++) {
1493 fw->ip.src.s_addr = saddrs[i].s_addr;
1494 for (j = 0; j < ndaddrs; j++) {
1495 fw->ip.dst.s_addr = daddrs[j].s_addr;
1497 print_firewall_line(fw, *handle);
1498 ret &= iptc_insert_entry(chain, fw, rulenum, handle);
1505 static unsigned char *
1506 make_delete_mask(struct ipt_entry *fw, struct iptables_rule_match *matches)
1508 /* Establish mask for comparison */
1510 struct iptables_rule_match *matchp;
1511 unsigned char *mask, *mptr;
1513 size = sizeof(struct ipt_entry);
1514 for (matchp = matches; matchp; matchp = matchp->next)
1515 size += IPT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size;
1517 mask = fw_calloc(1, size
1518 + IPT_ALIGN(sizeof(struct ipt_entry_target))
1519 + iptables_targets->size);
1521 memset(mask, 0xFF, sizeof(struct ipt_entry));
1522 mptr = mask + sizeof(struct ipt_entry);
1524 for (matchp = matches; matchp; matchp = matchp->next) {
1526 IPT_ALIGN(sizeof(struct ipt_entry_match))
1527 + matchp->match->userspacesize);
1528 mptr += IPT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size;
1532 IPT_ALIGN(sizeof(struct ipt_entry_target))
1533 + iptables_targets->userspacesize);
1539 delete_entry(const ipt_chainlabel chain,
1540 struct ipt_entry *fw,
1541 unsigned int nsaddrs,
1542 const struct in_addr saddrs[],
1543 unsigned int ndaddrs,
1544 const struct in_addr daddrs[],
1546 iptc_handle_t *handle,
1547 struct iptables_rule_match *matches)
1551 unsigned char *mask;
1553 mask = make_delete_mask(fw, matches);
1554 for (i = 0; i < nsaddrs; i++) {
1555 fw->ip.src.s_addr = saddrs[i].s_addr;
1556 for (j = 0; j < ndaddrs; j++) {
1557 fw->ip.dst.s_addr = daddrs[j].s_addr;
1559 print_firewall_line(fw, *handle);
1560 ret &= iptc_delete_entry(chain, fw, mask, handle);
1569 for_each_chain(int (*fn)(const ipt_chainlabel, int, iptc_handle_t *),
1570 int verbose, int builtinstoo, iptc_handle_t *handle)
1575 unsigned int i, chaincount = 0;
1577 chain = iptc_first_chain(handle);
1580 chain = iptc_next_chain(handle);
1583 chains = fw_malloc(sizeof(ipt_chainlabel) * chaincount);
1585 chain = iptc_first_chain(handle);
1587 strcpy(chains + i*sizeof(ipt_chainlabel), chain);
1589 chain = iptc_next_chain(handle);
1592 for (i = 0; i < chaincount; i++) {
1594 && iptc_builtin(chains + i*sizeof(ipt_chainlabel),
1597 ret &= fn(chains + i*sizeof(ipt_chainlabel), verbose, handle);
1605 flush_entries(const ipt_chainlabel chain, int verbose,
1606 iptc_handle_t *handle)
1609 return for_each_chain(flush_entries, verbose, 1, handle);
1612 fprintf(stdout, "Flushing chain `%s'\n", chain);
1613 return iptc_flush_entries(chain, handle);
1617 zero_entries(const ipt_chainlabel chain, int verbose,
1618 iptc_handle_t *handle)
1621 return for_each_chain(zero_entries, verbose, 1, handle);
1624 fprintf(stdout, "Zeroing chain `%s'\n", chain);
1625 return iptc_zero_entries(chain, handle);
1629 delete_chain(const ipt_chainlabel chain, int verbose,
1630 iptc_handle_t *handle)
1633 return for_each_chain(delete_chain, verbose, 0, handle);
1636 fprintf(stdout, "Deleting chain `%s'\n", chain);
1637 return iptc_delete_chain(chain, handle);
1641 list_entries(const ipt_chainlabel chain, int verbose, int numeric,
1642 int expanded, int linenumbers, iptc_handle_t *handle)
1645 unsigned int format;
1648 format = FMT_OPTIONS;
1650 format |= FMT_NOCOUNTS;
1655 format |= FMT_NUMERIC;
1658 format |= FMT_KILOMEGAGIGA;
1661 format |= FMT_LINENUMBERS;
1663 for (this = iptc_first_chain(handle);
1665 this = iptc_next_chain(handle)) {
1666 const struct ipt_entry *i;
1669 if (chain && strcmp(chain, this) != 0)
1672 if (found) printf("\n");
1674 print_header(format, this, handle);
1675 i = iptc_first_rule(this, handle);
1680 iptc_get_target(i, handle),
1684 i = iptc_next_rule(i, handle);
1693 static char *get_modprobe(void)
1698 #define PROCFILE_BUFSIZ 1024
1699 procfile = open(PROC_SYS_MODPROBE, O_RDONLY);
1703 ret = (char *) malloc(PROCFILE_BUFSIZ);
1705 memset(ret, 0, PROCFILE_BUFSIZ);
1706 switch (read(procfile, ret, PROCFILE_BUFSIZ)) {
1708 case PROCFILE_BUFSIZ: goto fail; /* Partial read. Wierd */
1710 if (ret[strlen(ret)-1]=='\n')
1711 ret[strlen(ret)-1]=0;
1721 int iptables_insmod(const char *modname, const char *modprobe)
1727 /* If they don't explicitly set it, read out of kernel */
1729 buf = get_modprobe();
1737 argv[0] = (char *)modprobe;
1738 argv[1] = (char *)modname;
1740 execv(argv[0], argv);
1742 /* not usually reached */
1747 default: /* parent */
1752 if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
1757 static struct ipt_entry *
1758 generate_entry(const struct ipt_entry *fw,
1759 struct iptables_rule_match *matches,
1760 struct ipt_entry_target *target)
1763 struct iptables_rule_match *matchp;
1764 struct ipt_entry *e;
1766 size = sizeof(struct ipt_entry);
1767 for (matchp = matches; matchp; matchp = matchp->next)
1768 size += matchp->match->m->u.match_size;
1770 e = fw_malloc(size + target->u.target_size);
1772 e->target_offset = size;
1773 e->next_offset = size + target->u.target_size;
1776 for (matchp = matches; matchp; matchp = matchp->next) {
1777 memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size);
1778 size += matchp->match->m->u.match_size;
1780 memcpy(e->elems + size, target, target->u.target_size);
1785 void clear_rule_matches(struct iptables_rule_match **matches)
1787 struct iptables_rule_match *matchp, *tmp;
1789 for (matchp = *matches; matchp;) {
1791 if (matchp->match->m)
1792 free(matchp->match->m);
1800 static void set_revision(char *name, u_int8_t revision)
1802 /* Old kernel sources don't have ".revision" field,
1803 but we stole a byte from name. */
1804 name[IPT_FUNCTION_MAXNAMELEN - 2] = '\0';
1805 name[IPT_FUNCTION_MAXNAMELEN - 1] = revision;
1808 int do_command(int argc, char *argv[], char **table, iptc_handle_t *handle)
1810 struct ipt_entry fw, *e = NULL;
1812 unsigned int nsaddrs = 0, ndaddrs = 0;
1813 struct in_addr *saddrs = NULL, *daddrs = NULL;
1816 const char *chain = NULL;
1817 const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL;
1818 const char *policy = NULL, *newname = NULL;
1819 unsigned int rulenum = 0, options = 0, command = 0;
1820 const char *pcnt = NULL, *bcnt = NULL;
1822 struct iptables_match *m;
1823 struct iptables_rule_match *matches = NULL;
1824 struct iptables_rule_match *matchp;
1825 struct iptables_target *target = NULL;
1826 struct iptables_target *t;
1827 const char *jumpto = "";
1828 char *protocol = NULL;
1829 const char *modprobe = NULL;
1832 memset(&fw, 0, sizeof(fw));
1834 /* re-set optind to 0 in case do_command gets called
1838 /* clear mflags in case do_command gets called a second time
1839 * (we clear the global list of all matches for security)*/
1840 for (m = iptables_matches; m; m = m->next)
1843 for (t = iptables_targets; t; t = t->next) {
1848 /* Suppress error messages: we may add new options if we
1849 demand-load a protocol. */
1852 while ((c = getopt_long(argc, argv,
1853 "-A:D:R:I:L::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:fbvnt:m:xc:",
1854 opts, NULL)) != -1) {
1860 add_command(&command, CMD_APPEND, CMD_NONE,
1866 add_command(&command, CMD_DELETE, CMD_NONE,
1869 if (optind < argc && argv[optind][0] != '-'
1870 && argv[optind][0] != '!') {
1871 rulenum = parse_rulenumber(argv[optind++]);
1872 command = CMD_DELETE_NUM;
1877 add_command(&command, CMD_REPLACE, CMD_NONE,
1880 if (optind < argc && argv[optind][0] != '-'
1881 && argv[optind][0] != '!')
1882 rulenum = parse_rulenumber(argv[optind++]);
1884 exit_error(PARAMETER_PROBLEM,
1885 "-%c requires a rule number",
1886 cmd2char(CMD_REPLACE));
1890 add_command(&command, CMD_INSERT, CMD_NONE,
1893 if (optind < argc && argv[optind][0] != '-'
1894 && argv[optind][0] != '!')
1895 rulenum = parse_rulenumber(argv[optind++]);
1900 add_command(&command, CMD_LIST, CMD_ZERO,
1902 if (optarg) chain = optarg;
1903 else if (optind < argc && argv[optind][0] != '-'
1904 && argv[optind][0] != '!')
1905 chain = argv[optind++];
1909 add_command(&command, CMD_FLUSH, CMD_NONE,
1911 if (optarg) chain = optarg;
1912 else if (optind < argc && argv[optind][0] != '-'
1913 && argv[optind][0] != '!')
1914 chain = argv[optind++];
1918 add_command(&command, CMD_ZERO, CMD_LIST,
1920 if (optarg) chain = optarg;
1921 else if (optind < argc && argv[optind][0] != '-'
1922 && argv[optind][0] != '!')
1923 chain = argv[optind++];
1927 if (optarg && (*optarg == '-' || *optarg == '!'))
1928 exit_error(PARAMETER_PROBLEM,
1929 "chain name not allowed to start "
1930 "with `%c'\n", *optarg);
1931 if (find_target(optarg, TRY_LOAD))
1932 exit_error(PARAMETER_PROBLEM,
1933 "chain name may not clash "
1934 "with target name\n");
1935 add_command(&command, CMD_NEW_CHAIN, CMD_NONE,
1941 add_command(&command, CMD_DELETE_CHAIN, CMD_NONE,
1943 if (optarg) chain = optarg;
1944 else if (optind < argc && argv[optind][0] != '-'
1945 && argv[optind][0] != '!')
1946 chain = argv[optind++];
1950 add_command(&command, CMD_RENAME_CHAIN, CMD_NONE,
1953 if (optind < argc && argv[optind][0] != '-'
1954 && argv[optind][0] != '!')
1955 newname = argv[optind++];
1957 exit_error(PARAMETER_PROBLEM,
1958 "-%c requires old-chain-name and "
1960 cmd2char(CMD_RENAME_CHAIN));
1964 add_command(&command, CMD_SET_POLICY, CMD_NONE,
1967 if (optind < argc && argv[optind][0] != '-'
1968 && argv[optind][0] != '!')
1969 policy = argv[optind++];
1971 exit_error(PARAMETER_PROBLEM,
1972 "-%c requires a chain and a policy",
1973 cmd2char(CMD_SET_POLICY));
1978 optarg = argv[optind];
1980 /* iptables -p icmp -h */
1981 if (!matches && protocol)
1982 find_match(protocol, TRY_LOAD, &matches);
1984 exit_printhelp(matches);
1990 check_inverse(optarg, &invert, &optind, argc);
1991 set_option(&options, OPT_PROTOCOL, &fw.ip.invflags,
1994 /* Canonicalize into lower case */
1995 for (protocol = argv[optind-1]; *protocol; protocol++)
1996 *protocol = tolower(*protocol);
1998 protocol = argv[optind-1];
1999 fw.ip.proto = parse_protocol(protocol);
2001 if (fw.ip.proto == 0
2002 && (fw.ip.invflags & IPT_INV_PROTO))
2003 exit_error(PARAMETER_PROBLEM,
2004 "rule would never match protocol");
2008 check_inverse(optarg, &invert, &optind, argc);
2009 set_option(&options, OPT_SOURCE, &fw.ip.invflags,
2011 shostnetworkmask = argv[optind-1];
2015 check_inverse(optarg, &invert, &optind, argc);
2016 set_option(&options, OPT_DESTINATION, &fw.ip.invflags,
2018 dhostnetworkmask = argv[optind-1];
2022 set_option(&options, OPT_JUMP, &fw.ip.invflags,
2024 jumpto = parse_target(optarg);
2025 /* TRY_LOAD (may be chain name) */
2026 target = find_target(jumpto, TRY_LOAD);
2031 size = IPT_ALIGN(sizeof(struct ipt_entry_target))
2034 target->t = fw_calloc(1, size);
2035 target->t->u.target_size = size;
2036 strcpy(target->t->u.user.name, jumpto);
2037 set_revision(target->t->u.user.name,
2039 if (target->init != NULL)
2040 target->init(target->t, &fw.nfcache);
2041 opts = merge_options(opts, target->extra_opts, &target->option_offset);
2047 check_inverse(optarg, &invert, &optind, argc);
2048 set_option(&options, OPT_VIANAMEIN, &fw.ip.invflags,
2050 parse_interface(argv[optind-1],
2052 fw.ip.iniface_mask);
2056 check_inverse(optarg, &invert, &optind, argc);
2057 set_option(&options, OPT_VIANAMEOUT, &fw.ip.invflags,
2059 parse_interface(argv[optind-1],
2061 fw.ip.outiface_mask);
2065 set_option(&options, OPT_FRAGMENT, &fw.ip.invflags,
2067 fw.ip.flags |= IPT_F_FRAG;
2072 set_option(&options, OPT_VERBOSE,
2073 &fw.ip.invflags, invert);
2081 exit_error(PARAMETER_PROBLEM,
2082 "unexpected ! flag before --match");
2084 m = find_match(optarg, LOAD_MUST_SUCCEED, &matches);
2085 size = IPT_ALIGN(sizeof(struct ipt_entry_match))
2087 m->m = fw_calloc(1, size);
2088 m->m->u.match_size = size;
2089 strcpy(m->m->u.user.name, m->name);
2090 set_revision(m->m->u.user.name, m->revision);
2091 if (m->init != NULL)
2092 m->init(m->m, &fw.nfcache);
2093 opts = merge_options(opts, m->extra_opts, &m->option_offset);
2098 set_option(&options, OPT_NUMERIC, &fw.ip.invflags,
2104 exit_error(PARAMETER_PROBLEM,
2105 "unexpected ! flag before --table");
2106 *table = argv[optind-1];
2110 set_option(&options, OPT_EXPANDED, &fw.ip.invflags,
2116 printf("Not %s ;-)\n", program_version);
2119 program_name, program_version);
2123 set_option(&options, OPT_LINENUMBERS, &fw.ip.invflags,
2133 set_option(&options, OPT_COUNTERS, &fw.ip.invflags,
2136 if (optind < argc && argv[optind][0] != '-'
2137 && argv[optind][0] != '!')
2138 bcnt = argv[optind++];
2140 exit_error(PARAMETER_PROBLEM,
2141 "-%c requires packet and byte counter",
2142 opt2char(OPT_COUNTERS));
2144 if (sscanf(pcnt, "%llu", (unsigned long long *)&fw.counters.pcnt) != 1)
2145 exit_error(PARAMETER_PROBLEM,
2146 "-%c packet counter not numeric",
2147 opt2char(OPT_COUNTERS));
2149 if (sscanf(bcnt, "%llu", (unsigned long long *)&fw.counters.bcnt) != 1)
2150 exit_error(PARAMETER_PROBLEM,
2151 "-%c byte counter not numeric",
2152 opt2char(OPT_COUNTERS));
2157 case 1: /* non option */
2158 if (optarg[0] == '!' && optarg[1] == '\0') {
2160 exit_error(PARAMETER_PROBLEM,
2161 "multiple consecutive ! not"
2167 printf("Bad argument `%s'\n", optarg);
2171 /* FIXME: This scheme doesn't allow two of the same
2174 || !(target->parse(c - target->option_offset,
2177 &fw, &target->t))) {
2178 for (matchp = matches; matchp; matchp = matchp->next) {
2179 if (matchp->match->parse(c - matchp->match->option_offset,
2181 &matchp->match->mflags,
2187 m = matchp ? matchp->match : NULL;
2189 /* If you listen carefully, you can
2190 actually hear this code suck. */
2192 /* some explanations (after four different bugs
2193 * in 3 different releases): If we encountere a
2194 * parameter, that has not been parsed yet,
2195 * it's not an option of an explicitly loaded
2196 * match or a target. However, we support
2197 * implicit loading of the protocol match
2198 * extension. '-p tcp' means 'l4 proto 6' and
2199 * at the same time 'load tcp protocol match on
2200 * demand if we specify --dport'.
2202 * To make this work, we need to make sure:
2203 * - the parameter has not been parsed by
2205 * - a protocol has been specified
2206 * - the protocol extension has not been
2207 * loaded yet, or is loaded and unused
2208 * [think of iptables-restore!]
2209 * - the protocol extension can be successively
2214 && (!find_proto(protocol, DONT_LOAD,
2215 options&OPT_NUMERIC, NULL)
2216 || (find_proto(protocol, DONT_LOAD,
2217 options&OPT_NUMERIC, NULL)
2218 && (proto_used == 0))
2220 && (m = find_proto(protocol, TRY_LOAD,
2221 options&OPT_NUMERIC, &matches))) {
2222 /* Try loading protocol */
2227 size = IPT_ALIGN(sizeof(struct ipt_entry_match))
2230 m->m = fw_calloc(1, size);
2231 m->m->u.match_size = size;
2232 strcpy(m->m->u.user.name, m->name);
2233 set_revision(m->m->u.user.name,
2235 if (m->init != NULL)
2236 m->init(m->m, &fw.nfcache);
2238 opts = merge_options(opts,
2239 m->extra_opts, &m->option_offset);
2245 exit_error(PARAMETER_PROBLEM,
2253 for (matchp = matches; matchp; matchp = matchp->next)
2254 matchp->match->final_check(matchp->match->mflags);
2257 target->final_check(target->tflags);
2259 /* Fix me: must put inverse options checking here --MN */
2262 exit_error(PARAMETER_PROBLEM,
2263 "unknown arguments found on commandline");
2265 exit_error(PARAMETER_PROBLEM, "no command specified");
2267 exit_error(PARAMETER_PROBLEM,
2268 "nothing appropriate following !");
2270 if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND)) {
2271 if (!(options & OPT_DESTINATION))
2272 dhostnetworkmask = "0.0.0.0/0";
2273 if (!(options & OPT_SOURCE))
2274 shostnetworkmask = "0.0.0.0/0";
2277 if (shostnetworkmask)
2278 parse_hostnetworkmask(shostnetworkmask, &saddrs,
2279 &(fw.ip.smsk), &nsaddrs);
2281 if (dhostnetworkmask)
2282 parse_hostnetworkmask(dhostnetworkmask, &daddrs,
2283 &(fw.ip.dmsk), &ndaddrs);
2285 if ((nsaddrs > 1 || ndaddrs > 1) &&
2286 (fw.ip.invflags & (IPT_INV_SRCIP | IPT_INV_DSTIP)))
2287 exit_error(PARAMETER_PROBLEM, "! not allowed with multiple"
2288 " source or destination IP addresses");
2290 if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1))
2291 exit_error(PARAMETER_PROBLEM, "Replacement rule does not "
2292 "specify a unique address");
2294 generic_opt_check(command, options);
2296 if (chain && strlen(chain) > IPT_FUNCTION_MAXNAMELEN)
2297 exit_error(PARAMETER_PROBLEM,
2298 "chain name `%s' too long (must be under %i chars)",
2299 chain, IPT_FUNCTION_MAXNAMELEN);
2301 /* only allocate handle if we weren't called with a handle */
2303 *handle = iptc_init(*table);
2305 /* try to insmod the module if iptc_init failed */
2306 if (!*handle && iptables_insmod("ip_tables", modprobe) != -1)
2307 *handle = iptc_init(*table);
2310 exit_error(VERSION_PROBLEM,
2311 "can't initialize iptables table `%s': %s",
2312 *table, iptc_strerror(errno));
2314 if (command == CMD_APPEND
2315 || command == CMD_DELETE
2316 || command == CMD_INSERT
2317 || command == CMD_REPLACE) {
2318 if (strcmp(chain, "PREROUTING") == 0
2319 || strcmp(chain, "INPUT") == 0) {
2320 /* -o not valid with incoming packets. */
2321 if (options & OPT_VIANAMEOUT)
2322 exit_error(PARAMETER_PROBLEM,
2323 "Can't use -%c with %s\n",
2324 opt2char(OPT_VIANAMEOUT),
2328 if (strcmp(chain, "POSTROUTING") == 0
2329 || strcmp(chain, "OUTPUT") == 0) {
2330 /* -i not valid with outgoing packets */
2331 if (options & OPT_VIANAMEIN)
2332 exit_error(PARAMETER_PROBLEM,
2333 "Can't use -%c with %s\n",
2334 opt2char(OPT_VIANAMEIN),
2338 if (target && iptc_is_chain(jumpto, *handle)) {
2339 printf("Warning: using chain %s, not extension\n",
2348 /* If they didn't specify a target, or it's a chain
2349 name, use standard. */
2351 && (strlen(jumpto) == 0
2352 || iptc_is_chain(jumpto, *handle))) {
2355 target = find_target(IPT_STANDARD_TARGET,
2358 size = sizeof(struct ipt_entry_target)
2360 target->t = fw_calloc(1, size);
2361 target->t->u.target_size = size;
2362 strcpy(target->t->u.user.name, jumpto);
2363 set_revision(target->t->u.user.name, target->revision);
2364 if (target->init != NULL)
2365 target->init(target->t, &fw.nfcache);
2369 /* it is no chain, and we can't load a plugin.
2370 * We cannot know if the plugin is corrupt, non
2371 * existant OR if the user just misspelled a
2373 find_target(jumpto, LOAD_MUST_SUCCEED);
2375 e = generate_entry(&fw, matches, target->t);
2382 ret = append_entry(chain, e,
2383 nsaddrs, saddrs, ndaddrs, daddrs,
2384 options&OPT_VERBOSE,
2388 ret = delete_entry(chain, e,
2389 nsaddrs, saddrs, ndaddrs, daddrs,
2390 options&OPT_VERBOSE,
2393 case CMD_DELETE_NUM:
2394 ret = iptc_delete_num_entry(chain, rulenum - 1, handle);
2397 ret = replace_entry(chain, e, rulenum - 1,
2398 saddrs, daddrs, options&OPT_VERBOSE,
2402 ret = insert_entry(chain, e, rulenum - 1,
2403 nsaddrs, saddrs, ndaddrs, daddrs,
2404 options&OPT_VERBOSE,
2408 ret = list_entries(chain,
2409 options&OPT_VERBOSE,
2410 options&OPT_NUMERIC,
2411 options&OPT_EXPANDED,
2412 options&OPT_LINENUMBERS,
2416 ret = flush_entries(chain, options&OPT_VERBOSE, handle);
2419 ret = zero_entries(chain, options&OPT_VERBOSE, handle);
2421 case CMD_LIST|CMD_ZERO:
2422 ret = list_entries(chain,
2423 options&OPT_VERBOSE,
2424 options&OPT_NUMERIC,
2425 options&OPT_EXPANDED,
2426 options&OPT_LINENUMBERS,
2429 ret = zero_entries(chain,
2430 options&OPT_VERBOSE, handle);
2433 ret = iptc_create_chain(chain, handle);
2435 case CMD_DELETE_CHAIN:
2436 ret = delete_chain(chain, options&OPT_VERBOSE, handle);
2438 case CMD_RENAME_CHAIN:
2439 ret = iptc_rename_chain(chain, newname, handle);
2441 case CMD_SET_POLICY:
2442 ret = iptc_set_policy(chain, policy, NULL, handle);
2445 /* We should never reach this... */
2450 dump_entries(*handle);
2452 clear_rule_matches(&matches);