| /* Code to take an iptables-style command line and do it. */ |
| |
| /* |
| * Author: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au |
| * |
| * (C) 2000-2002 by the netfilter coreteam <coreteam@netfilter.org>: |
| * Paul 'Rusty' Russell <rusty@rustcorp.com.au> |
| * Marc Boucher <marc+nf@mbsi.ca> |
| * James Morris <jmorris@intercode.com.au> |
| * Harald Welte <laforge@gnumonks.org> |
| * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| #include "config.h" |
| #include <getopt.h> |
| #include <string.h> |
| #include <netdb.h> |
| #include <errno.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <ctype.h> |
| #include <stdarg.h> |
| #include <limits.h> |
| #include <unistd.h> |
| #include <iptables.h> |
| #include <xtables.h> |
| #include <fcntl.h> |
| #include "xshared.h" |
| |
| static const char unsupported_rev[] = " [unsupported revision]"; |
| |
| static struct option original_opts[] = { |
| {.name = "append", .has_arg = 1, .val = 'A'}, |
| {.name = "delete", .has_arg = 1, .val = 'D'}, |
| {.name = "check", .has_arg = 1, .val = 'C'}, |
| {.name = "insert", .has_arg = 1, .val = 'I'}, |
| {.name = "replace", .has_arg = 1, .val = 'R'}, |
| {.name = "list", .has_arg = 2, .val = 'L'}, |
| {.name = "list-rules", .has_arg = 2, .val = 'S'}, |
| {.name = "flush", .has_arg = 2, .val = 'F'}, |
| {.name = "zero", .has_arg = 2, .val = 'Z'}, |
| {.name = "new-chain", .has_arg = 1, .val = 'N'}, |
| {.name = "delete-chain", .has_arg = 2, .val = 'X'}, |
| {.name = "rename-chain", .has_arg = 1, .val = 'E'}, |
| {.name = "policy", .has_arg = 1, .val = 'P'}, |
| {.name = "source", .has_arg = 1, .val = 's'}, |
| {.name = "destination", .has_arg = 1, .val = 'd'}, |
| {.name = "src", .has_arg = 1, .val = 's'}, /* synonym */ |
| {.name = "dst", .has_arg = 1, .val = 'd'}, /* synonym */ |
| {.name = "protocol", .has_arg = 1, .val = 'p'}, |
| {.name = "in-interface", .has_arg = 1, .val = 'i'}, |
| {.name = "jump", .has_arg = 1, .val = 'j'}, |
| {.name = "table", .has_arg = 1, .val = 't'}, |
| {.name = "match", .has_arg = 1, .val = 'm'}, |
| {.name = "numeric", .has_arg = 0, .val = 'n'}, |
| {.name = "out-interface", .has_arg = 1, .val = 'o'}, |
| {.name = "verbose", .has_arg = 0, .val = 'v'}, |
| {.name = "wait", .has_arg = 2, .val = 'w'}, |
| {.name = "wait-interval", .has_arg = 2, .val = 'W'}, |
| {.name = "exact", .has_arg = 0, .val = 'x'}, |
| {.name = "fragments", .has_arg = 0, .val = 'f'}, |
| {.name = "version", .has_arg = 0, .val = 'V'}, |
| {.name = "help", .has_arg = 2, .val = 'h'}, |
| {.name = "line-numbers", .has_arg = 0, .val = '0'}, |
| {.name = "modprobe", .has_arg = 1, .val = 'M'}, |
| {.name = "set-counters", .has_arg = 1, .val = 'c'}, |
| {.name = "goto", .has_arg = 1, .val = 'g'}, |
| {.name = "ipv4", .has_arg = 0, .val = '4'}, |
| {.name = "ipv6", .has_arg = 0, .val = '6'}, |
| {NULL}, |
| }; |
| |
| void iptables_exit_error(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3))); |
| |
| struct xtables_globals iptables_globals = { |
| .option_offset = 0, |
| .program_version = PACKAGE_VERSION, |
| .orig_opts = original_opts, |
| .exit_err = iptables_exit_error, |
| .compat_rev = xtables_compatible_revision, |
| }; |
| |
| static const int inverse_for_options[NUMBER_OF_OPT] = |
| { |
| /* -n */ 0, |
| /* -s */ IPT_INV_SRCIP, |
| /* -d */ IPT_INV_DSTIP, |
| /* -p */ XT_INV_PROTO, |
| /* -j */ 0, |
| /* -v */ 0, |
| /* -x */ 0, |
| /* -i */ IPT_INV_VIA_IN, |
| /* -o */ IPT_INV_VIA_OUT, |
| /*--line*/ 0, |
| /* -c */ 0, |
| /* -f */ IPT_INV_FRAG, |
| }; |
| |
| #define opts iptables_globals.opts |
| #define prog_name iptables_globals.program_name |
| #define prog_vers iptables_globals.program_version |
| |
| static void __attribute__((noreturn)) |
| exit_tryhelp(int status) |
| { |
| if (line != -1) |
| fprintf(stderr, "Error occurred at line: %d\n", line); |
| fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n", |
| prog_name, prog_name); |
| xtables_free_opts(1); |
| exit(status); |
| } |
| |
| static void |
| exit_printhelp(const struct xtables_rule_match *matches) |
| { |
| printf("%s v%s\n\n" |
| "Usage: %s -[ACD] chain rule-specification [options]\n" |
| " %s -I chain [rulenum] rule-specification [options]\n" |
| " %s -R chain rulenum rule-specification [options]\n" |
| " %s -D chain rulenum [options]\n" |
| " %s -[LS] [chain [rulenum]] [options]\n" |
| " %s -[FZ] [chain] [options]\n" |
| " %s -[NX] chain\n" |
| " %s -E old-chain-name new-chain-name\n" |
| " %s -P chain target [options]\n" |
| " %s -h (print this help information)\n\n", |
| prog_name, prog_vers, prog_name, prog_name, |
| prog_name, prog_name, prog_name, prog_name, |
| prog_name, prog_name, prog_name, prog_name); |
| |
| printf( |
| "Commands:\n" |
| "Either long or short options are allowed.\n" |
| " --append -A chain Append to chain\n" |
| " --check -C chain Check for the existence of a rule\n" |
| " --delete -D chain Delete matching rule from chain\n" |
| " --delete -D chain rulenum\n" |
| " Delete rule rulenum (1 = first) from chain\n" |
| " --insert -I chain [rulenum]\n" |
| " Insert in chain as rulenum (default 1=first)\n" |
| " --replace -R chain rulenum\n" |
| " Replace rule rulenum (1 = first) in chain\n" |
| " --list -L [chain [rulenum]]\n" |
| " List the rules in a chain or all chains\n" |
| " --list-rules -S [chain [rulenum]]\n" |
| " Print the rules in a chain or all chains\n" |
| " --flush -F [chain] Delete all rules in chain or all chains\n" |
| " --zero -Z [chain [rulenum]]\n" |
| " Zero counters in chain or all chains\n" |
| " --new -N chain Create a new user-defined chain\n" |
| " --delete-chain\n" |
| " -X [chain] Delete a user-defined chain\n" |
| " --policy -P chain target\n" |
| " Change policy on chain to target\n" |
| " --rename-chain\n" |
| " -E old-chain new-chain\n" |
| " Change chain name, (moving any references)\n" |
| |
| "Options:\n" |
| " --ipv4 -4 Nothing (line is ignored by ip6tables-restore)\n" |
| " --ipv6 -6 Error (line is ignored by iptables-restore)\n" |
| "[!] --protocol -p proto protocol: by number or name, eg. `tcp'\n" |
| "[!] --source -s address[/mask][...]\n" |
| " source specification\n" |
| "[!] --destination -d address[/mask][...]\n" |
| " destination specification\n" |
| "[!] --in-interface -i input name[+]\n" |
| " network interface name ([+] for wildcard)\n" |
| " --jump -j target\n" |
| " target for rule (may load target extension)\n" |
| #ifdef IPT_F_GOTO |
| " --goto -g chain\n" |
| " jump to chain with no return\n" |
| #endif |
| " --match -m match\n" |
| " extended match (may load extension)\n" |
| " --numeric -n numeric output of addresses and ports\n" |
| "[!] --out-interface -o output name[+]\n" |
| " network interface name ([+] for wildcard)\n" |
| " --table -t table table to manipulate (default: `filter')\n" |
| " --verbose -v verbose mode\n" |
| " --wait -w [seconds] maximum wait to acquire xtables lock before give up\n" |
| " --wait-interval -W [usecs] wait time to try to acquire xtables lock\n" |
| " default is 1 second\n" |
| " --line-numbers print line numbers when listing\n" |
| " --exact -x expand numbers (display exact values)\n" |
| "[!] --fragment -f match second or further fragments only\n" |
| " --modprobe=<command> try to insert modules using this command\n" |
| " --set-counters PKTS BYTES set the counter during insert/append\n" |
| "[!] --version -V print package version.\n"); |
| |
| print_extension_helps(xtables_targets, matches); |
| exit(0); |
| } |
| |
| void |
| iptables_exit_error(enum xtables_exittype status, const char *msg, ...) |
| { |
| va_list args; |
| |
| va_start(args, msg); |
| fprintf(stderr, "%s v%s (legacy): ", prog_name, prog_vers); |
| vfprintf(stderr, msg, args); |
| va_end(args); |
| fprintf(stderr, "\n"); |
| if (status == PARAMETER_PROBLEM) |
| exit_tryhelp(status); |
| if (status == VERSION_PROBLEM) |
| fprintf(stderr, |
| "Perhaps iptables or your kernel needs to be upgraded.\n"); |
| /* On error paths, make sure that we don't leak memory */ |
| xtables_free_opts(1); |
| exit(status); |
| } |
| |
| /* |
| * All functions starting with "parse" should succeed, otherwise |
| * the program fails. |
| * Most routines return pointers to static data that may change |
| * between calls to the same or other routines with a few exceptions: |
| * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask" |
| * return global static data. |
| */ |
| |
| /* Christophe Burki wants `-p 6' to imply `-m tcp'. */ |
| |
| static void |
| parse_chain(const char *chainname) |
| { |
| const char *ptr; |
| |
| if (strlen(chainname) >= XT_EXTENSION_MAXNAMELEN) |
| xtables_error(PARAMETER_PROBLEM, |
| "chain name `%s' too long (must be under %u chars)", |
| chainname, XT_EXTENSION_MAXNAMELEN); |
| |
| if (*chainname == '-' || *chainname == '!') |
| xtables_error(PARAMETER_PROBLEM, |
| "chain name not allowed to start " |
| "with `%c'\n", *chainname); |
| |
| if (xtables_find_target(chainname, XTF_TRY_LOAD)) |
| xtables_error(PARAMETER_PROBLEM, |
| "chain name may not clash " |
| "with target name\n"); |
| |
| for (ptr = chainname; *ptr; ptr++) |
| if (isspace(*ptr)) |
| xtables_error(PARAMETER_PROBLEM, |
| "Invalid chain name `%s'", chainname); |
| } |
| |
| static void |
| set_option(unsigned int *options, unsigned int option, uint8_t *invflg, |
| int invert) |
| { |
| if (*options & option) |
| xtables_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed", |
| opt2char(option)); |
| *options |= option; |
| |
| if (invert) { |
| unsigned int i; |
| for (i = 0; 1 << i != option; i++); |
| |
| if (!inverse_for_options[i]) |
| xtables_error(PARAMETER_PROBLEM, |
| "cannot have ! before -%c", |
| opt2char(option)); |
| *invflg |= inverse_for_options[i]; |
| } |
| } |
| |
| static void |
| print_header(unsigned int format, const char *chain, struct xtc_handle *handle) |
| { |
| struct xt_counters counters; |
| const char *pol = iptc_get_policy(chain, &counters, handle); |
| printf("Chain %s", chain); |
| if (pol) { |
| printf(" (policy %s", pol); |
| if (!(format & FMT_NOCOUNTS)) { |
| fputc(' ', stdout); |
| xtables_print_num(counters.pcnt, (format|FMT_NOTABLE)); |
| fputs("packets, ", stdout); |
| xtables_print_num(counters.bcnt, (format|FMT_NOTABLE)); |
| fputs("bytes", stdout); |
| } |
| printf(")\n"); |
| } else { |
| unsigned int refs; |
| if (!iptc_get_references(&refs, chain, handle)) |
| printf(" (ERROR obtaining refs)\n"); |
| else |
| printf(" (%u references)\n", refs); |
| } |
| |
| if (format & FMT_LINENUMBERS) |
| printf(FMT("%-4s ", "%s "), "num"); |
| if (!(format & FMT_NOCOUNTS)) { |
| if (format & FMT_KILOMEGAGIGA) { |
| printf(FMT("%5s ","%s "), "pkts"); |
| printf(FMT("%5s ","%s "), "bytes"); |
| } else { |
| printf(FMT("%8s ","%s "), "pkts"); |
| printf(FMT("%10s ","%s "), "bytes"); |
| } |
| } |
| if (!(format & FMT_NOTARGET)) |
| printf(FMT("%-9s ","%s "), "target"); |
| fputs(" prot ", stdout); |
| if (format & FMT_OPTIONS) |
| fputs("opt", stdout); |
| if (format & FMT_VIA) { |
| printf(FMT(" %-6s ","%s "), "in"); |
| printf(FMT("%-6s ","%s "), "out"); |
| } |
| printf(FMT(" %-19s ","%s "), "source"); |
| printf(FMT(" %-19s "," %s "), "destination"); |
| printf("\n"); |
| } |
| |
| |
| static int |
| print_match(const struct xt_entry_match *m, |
| const struct ipt_ip *ip, |
| int numeric) |
| { |
| const char *name = m->u.user.name; |
| const int revision = m->u.user.revision; |
| struct xtables_match *match, *mt; |
| |
| match = xtables_find_match(name, XTF_TRY_LOAD, NULL); |
| if (match) { |
| mt = xtables_find_match_revision(name, XTF_TRY_LOAD, |
| match, revision); |
| if (mt && mt->print) |
| mt->print(ip, m, numeric); |
| else if (match->print) |
| printf("%s%s ", match->name, unsupported_rev); |
| else |
| printf("%s ", match->name); |
| } else { |
| if (name[0]) |
| printf("UNKNOWN match `%s' ", name); |
| } |
| /* Don't stop iterating. */ |
| return 0; |
| } |
| |
| /* e is called `fw' here for historical reasons */ |
| static void |
| print_firewall(const struct ipt_entry *fw, |
| const char *targname, |
| unsigned int num, |
| unsigned int format, |
| struct xtc_handle *const handle) |
| { |
| struct xtables_target *target, *tg; |
| const struct xt_entry_target *t; |
| uint8_t flags; |
| |
| if (!iptc_is_chain(targname, handle)) |
| target = xtables_find_target(targname, XTF_TRY_LOAD); |
| else |
| target = xtables_find_target(XT_STANDARD_TARGET, |
| XTF_LOAD_MUST_SUCCEED); |
| |
| t = ipt_get_target((struct ipt_entry *)fw); |
| flags = fw->ip.flags; |
| |
| if (format & FMT_LINENUMBERS) |
| printf(FMT("%-4u ", "%u "), num); |
| |
| if (!(format & FMT_NOCOUNTS)) { |
| xtables_print_num(fw->counters.pcnt, format); |
| xtables_print_num(fw->counters.bcnt, format); |
| } |
| |
| if (!(format & FMT_NOTARGET)) |
| printf(FMT("%-9s ", "%s "), targname); |
| |
| fputc(fw->ip.invflags & XT_INV_PROTO ? '!' : ' ', stdout); |
| { |
| const char *pname = proto_to_name(fw->ip.proto, format&FMT_NUMERIC); |
| if (pname) |
| printf(FMT("%-5s", "%s "), pname); |
| else |
| printf(FMT("%-5hu", "%hu "), fw->ip.proto); |
| } |
| |
| if (format & FMT_OPTIONS) { |
| if (format & FMT_NOTABLE) |
| fputs("opt ", stdout); |
| fputc(fw->ip.invflags & IPT_INV_FRAG ? '!' : '-', stdout); |
| fputc(flags & IPT_F_FRAG ? 'f' : '-', stdout); |
| fputc(' ', stdout); |
| } |
| |
| print_ifaces(fw->ip.iniface, fw->ip.outiface, fw->ip.invflags, format); |
| |
| print_ipv4_addresses(fw, format); |
| |
| if (format & FMT_NOTABLE) |
| fputs(" ", stdout); |
| |
| #ifdef IPT_F_GOTO |
| if(fw->ip.flags & IPT_F_GOTO) |
| printf("[goto] "); |
| #endif |
| |
| IPT_MATCH_ITERATE(fw, print_match, &fw->ip, format & FMT_NUMERIC); |
| |
| if (target) { |
| const int revision = t->u.user.revision; |
| |
| tg = xtables_find_target_revision(targname, XTF_TRY_LOAD, |
| target, revision); |
| if (tg && tg->print) |
| /* Print the target information. */ |
| tg->print(&fw->ip, t, format & FMT_NUMERIC); |
| else if (target->print) |
| printf(" %s%s", target->name, unsupported_rev); |
| } else if (t->u.target_size != sizeof(*t)) |
| printf("[%u bytes of unknown target data] ", |
| (unsigned int)(t->u.target_size - sizeof(*t))); |
| |
| if (!(format & FMT_NONEWLINE)) |
| fputc('\n', stdout); |
| } |
| |
| static void |
| print_firewall_line(const struct ipt_entry *fw, |
| struct xtc_handle *const h) |
| { |
| struct xt_entry_target *t; |
| |
| t = ipt_get_target((struct ipt_entry *)fw); |
| print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h); |
| } |
| |
| static int |
| append_entry(const xt_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 xtc_handle *handle) |
| { |
| unsigned int i, j; |
| int ret = 1; |
| |
| for (i = 0; i < nsaddrs; i++) { |
| fw->ip.src.s_addr = saddrs[i].s_addr; |
| fw->ip.smsk.s_addr = smasks[i].s_addr; |
| for (j = 0; j < ndaddrs; j++) { |
| fw->ip.dst.s_addr = daddrs[j].s_addr; |
| fw->ip.dmsk.s_addr = dmasks[j].s_addr; |
| if (verbose) |
| print_firewall_line(fw, handle); |
| ret &= iptc_append_entry(chain, fw, handle); |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int |
| replace_entry(const xt_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 xtc_handle *handle) |
| { |
| fw->ip.src.s_addr = saddr->s_addr; |
| fw->ip.dst.s_addr = daddr->s_addr; |
| fw->ip.smsk.s_addr = smask->s_addr; |
| fw->ip.dmsk.s_addr = dmask->s_addr; |
| |
| if (verbose) |
| print_firewall_line(fw, handle); |
| return iptc_replace_entry(chain, fw, rulenum, handle); |
| } |
| |
| static int |
| insert_entry(const xt_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 xtc_handle *handle) |
| { |
| unsigned int i, j; |
| int ret = 1; |
| |
| for (i = 0; i < nsaddrs; i++) { |
| fw->ip.src.s_addr = saddrs[i].s_addr; |
| fw->ip.smsk.s_addr = smasks[i].s_addr; |
| for (j = 0; j < ndaddrs; j++) { |
| fw->ip.dst.s_addr = daddrs[j].s_addr; |
| fw->ip.dmsk.s_addr = dmasks[j].s_addr; |
| if (verbose) |
| print_firewall_line(fw, handle); |
| ret &= iptc_insert_entry(chain, fw, rulenum, handle); |
| } |
| } |
| |
| return ret; |
| } |
| |
| static unsigned char * |
| make_delete_mask(const struct xtables_rule_match *matches, |
| const struct xtables_target *target) |
| { |
| /* Establish mask for comparison */ |
| unsigned int size; |
| const struct xtables_rule_match *matchp; |
| unsigned char *mask, *mptr; |
| |
| size = sizeof(struct ipt_entry); |
| for (matchp = matches; matchp; matchp = matchp->next) |
| size += XT_ALIGN(sizeof(struct xt_entry_match)) + matchp->match->size; |
| |
| mask = xtables_calloc(1, size |
| + XT_ALIGN(sizeof(struct xt_entry_target)) |
| + target->size); |
| |
| memset(mask, 0xFF, sizeof(struct ipt_entry)); |
| mptr = mask + sizeof(struct ipt_entry); |
| |
| for (matchp = matches; matchp; matchp = matchp->next) { |
| memset(mptr, 0xFF, |
| XT_ALIGN(sizeof(struct xt_entry_match)) |
| + matchp->match->userspacesize); |
| mptr += XT_ALIGN(sizeof(struct xt_entry_match)) + matchp->match->size; |
| } |
| |
| memset(mptr, 0xFF, |
| XT_ALIGN(sizeof(struct xt_entry_target)) |
| + target->userspacesize); |
| |
| return mask; |
| } |
| |
| static int |
| delete_entry(const xt_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 xtc_handle *handle, |
| struct xtables_rule_match *matches, |
| const struct xtables_target *target) |
| { |
| unsigned int i, j; |
| int ret = 1; |
| unsigned char *mask; |
| |
| mask = make_delete_mask(matches, target); |
| for (i = 0; i < nsaddrs; i++) { |
| fw->ip.src.s_addr = saddrs[i].s_addr; |
| fw->ip.smsk.s_addr = smasks[i].s_addr; |
| for (j = 0; j < ndaddrs; j++) { |
| fw->ip.dst.s_addr = daddrs[j].s_addr; |
| fw->ip.dmsk.s_addr = dmasks[j].s_addr; |
| if (verbose) |
| print_firewall_line(fw, handle); |
| ret &= iptc_delete_entry(chain, fw, mask, handle); |
| } |
| } |
| free(mask); |
| |
| return ret; |
| } |
| |
| static int |
| check_entry(const xt_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 xtc_handle *handle, |
| struct xtables_rule_match *matches, |
| const struct xtables_target *target) |
| { |
| unsigned int i, j; |
| int ret = 1; |
| unsigned char *mask; |
| |
| mask = make_delete_mask(matches, target); |
| for (i = 0; i < nsaddrs; i++) { |
| fw->ip.src.s_addr = saddrs[i].s_addr; |
| fw->ip.smsk.s_addr = smasks[i].s_addr; |
| for (j = 0; j < ndaddrs; j++) { |
| fw->ip.dst.s_addr = daddrs[j].s_addr; |
| fw->ip.dmsk.s_addr = dmasks[j].s_addr; |
| if (verbose) |
| print_firewall_line(fw, handle); |
| ret &= iptc_check_entry(chain, fw, mask, handle); |
| } |
| } |
| |
| free(mask); |
| return ret; |
| } |
| |
| int |
| for_each_chain4(int (*fn)(const xt_chainlabel, int, struct xtc_handle *), |
| int verbose, int builtinstoo, struct xtc_handle *handle) |
| { |
| int ret = 1; |
| const char *chain; |
| char *chains; |
| unsigned int i, chaincount = 0; |
| |
| chain = iptc_first_chain(handle); |
| while (chain) { |
| chaincount++; |
| chain = iptc_next_chain(handle); |
| } |
| |
| chains = xtables_malloc(sizeof(xt_chainlabel) * chaincount); |
| i = 0; |
| chain = iptc_first_chain(handle); |
| while (chain) { |
| strcpy(chains + i*sizeof(xt_chainlabel), chain); |
| i++; |
| chain = iptc_next_chain(handle); |
| } |
| |
| for (i = 0; i < chaincount; i++) { |
| if (!builtinstoo |
| && iptc_builtin(chains + i*sizeof(xt_chainlabel), |
| handle) == 1) |
| continue; |
| ret &= fn(chains + i*sizeof(xt_chainlabel), verbose, handle); |
| } |
| |
| free(chains); |
| return ret; |
| } |
| |
| int |
| flush_entries4(const xt_chainlabel chain, int verbose, |
| struct xtc_handle *handle) |
| { |
| if (!chain) |
| return for_each_chain4(flush_entries4, verbose, 1, handle); |
| |
| if (verbose) |
| fprintf(stdout, "Flushing chain `%s'\n", chain); |
| return iptc_flush_entries(chain, handle); |
| } |
| |
| static int |
| zero_entries(const xt_chainlabel chain, int verbose, |
| struct xtc_handle *handle) |
| { |
| if (!chain) |
| return for_each_chain4(zero_entries, verbose, 1, handle); |
| |
| if (verbose) |
| fprintf(stdout, "Zeroing chain `%s'\n", chain); |
| return iptc_zero_entries(chain, handle); |
| } |
| |
| int |
| delete_chain4(const xt_chainlabel chain, int verbose, |
| struct xtc_handle *handle) |
| { |
| if (!chain) |
| return for_each_chain4(delete_chain4, verbose, 0, handle); |
| |
| if (verbose) |
| fprintf(stdout, "Deleting chain `%s'\n", chain); |
| return iptc_delete_chain(chain, handle); |
| } |
| |
| static int |
| list_entries(const xt_chainlabel chain, int rulenum, int verbose, int numeric, |
| int expanded, int linenumbers, struct xtc_handle *handle) |
| { |
| int found = 0; |
| unsigned int format; |
| const char *this; |
| |
| format = FMT_OPTIONS; |
| if (!verbose) |
| format |= FMT_NOCOUNTS; |
| else |
| format |= FMT_VIA; |
| |
| if (numeric) |
| format |= FMT_NUMERIC; |
| |
| if (!expanded) |
| format |= FMT_KILOMEGAGIGA; |
| |
| if (linenumbers) |
| format |= FMT_LINENUMBERS; |
| |
| for (this = iptc_first_chain(handle); |
| this; |
| this = iptc_next_chain(handle)) { |
| const struct ipt_entry *i; |
| unsigned int num; |
| |
| if (chain && strcmp(chain, this) != 0) |
| continue; |
| |
| if (found) printf("\n"); |
| |
| if (!rulenum) |
| print_header(format, this, handle); |
| i = iptc_first_rule(this, handle); |
| |
| num = 0; |
| while (i) { |
| num++; |
| if (!rulenum || num == rulenum) |
| print_firewall(i, |
| iptc_get_target(i, handle), |
| num, |
| format, |
| handle); |
| i = iptc_next_rule(i, handle); |
| } |
| found = 1; |
| } |
| |
| errno = ENOENT; |
| return found; |
| } |
| |
| static void print_proto(uint16_t proto, int invert) |
| { |
| if (proto) { |
| unsigned int i; |
| const char *invertstr = invert ? " !" : ""; |
| |
| const struct protoent *pent = getprotobynumber(proto); |
| if (pent) { |
| printf("%s -p %s", invertstr, pent->p_name); |
| return; |
| } |
| |
| for (i = 0; xtables_chain_protos[i].name != NULL; ++i) |
| if (xtables_chain_protos[i].num == proto) { |
| printf("%s -p %s", |
| invertstr, xtables_chain_protos[i].name); |
| return; |
| } |
| |
| printf("%s -p %u", invertstr, proto); |
| } |
| } |
| |
| #define IP_PARTS_NATIVE(n) \ |
| (unsigned int)((n)>>24)&0xFF, \ |
| (unsigned int)((n)>>16)&0xFF, \ |
| (unsigned int)((n)>>8)&0xFF, \ |
| (unsigned int)((n)&0xFF) |
| |
| #define IP_PARTS(n) IP_PARTS_NATIVE(ntohl(n)) |
| |
| /* This assumes that mask is contiguous, and byte-bounded. */ |
| static void |
| print_iface(char letter, const char *iface, const unsigned char *mask, |
| int invert) |
| { |
| unsigned int i; |
| |
| if (mask[0] == 0) |
| return; |
| |
| printf("%s -%c ", invert ? " !" : "", letter); |
| |
| for (i = 0; i < IFNAMSIZ; i++) { |
| if (mask[i] != 0) { |
| if (iface[i] != '\0') |
| printf("%c", iface[i]); |
| } else { |
| /* we can access iface[i-1] here, because |
| * a few lines above we make sure that mask[0] != 0 */ |
| if (iface[i-1] != '\0') |
| printf("+"); |
| break; |
| } |
| } |
| } |
| |
| static int print_match_save(const struct xt_entry_match *e, |
| const struct ipt_ip *ip) |
| { |
| const char *name = e->u.user.name; |
| const int revision = e->u.user.revision; |
| struct xtables_match *match, *mt, *mt2; |
| |
| match = xtables_find_match(name, XTF_TRY_LOAD, NULL); |
| if (match) { |
| mt = mt2 = xtables_find_match_revision(name, XTF_TRY_LOAD, |
| match, revision); |
| if (!mt2) |
| mt2 = match; |
| printf(" -m %s", mt2->alias ? mt2->alias(e) : name); |
| |
| /* some matches don't provide a save function */ |
| if (mt && mt->save) |
| mt->save(ip, e); |
| else if (match->save) |
| printf(unsupported_rev); |
| } else { |
| if (e->u.match_size) { |
| fprintf(stderr, |
| "Can't find library for match `%s'\n", |
| name); |
| exit(1); |
| } |
| } |
| return 0; |
| } |
| |
| /* Print a given ip including mask if necessary. */ |
| static void print_ip(const char *prefix, uint32_t ip, |
| uint32_t mask, int invert) |
| { |
| uint32_t bits, hmask = ntohl(mask); |
| int i; |
| |
| if (!mask && !ip && !invert) |
| return; |
| |
| printf("%s %s %u.%u.%u.%u", |
| invert ? " !" : "", |
| prefix, |
| IP_PARTS(ip)); |
| |
| if (mask == 0xFFFFFFFFU) { |
| printf("/32"); |
| return; |
| } |
| |
| i = 32; |
| bits = 0xFFFFFFFEU; |
| while (--i >= 0 && hmask != bits) |
| bits <<= 1; |
| if (i >= 0) |
| printf("/%u", i); |
| else |
| printf("/%u.%u.%u.%u", IP_PARTS(mask)); |
| } |
| |
| /* We want this to be readable, so only print out necessary fields. |
| * Because that's the kind of world I want to live in. |
| */ |
| void print_rule4(const struct ipt_entry *e, |
| struct xtc_handle *h, const char *chain, int counters) |
| { |
| const struct xt_entry_target *t; |
| const char *target_name; |
| |
| /* print counters for iptables-save */ |
| if (counters > 0) |
| printf("[%llu:%llu] ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt); |
| |
| /* print chain name */ |
| printf("-A %s", chain); |
| |
| /* Print IP part. */ |
| print_ip("-s", e->ip.src.s_addr,e->ip.smsk.s_addr, |
| e->ip.invflags & IPT_INV_SRCIP); |
| |
| print_ip("-d", e->ip.dst.s_addr, e->ip.dmsk.s_addr, |
| e->ip.invflags & IPT_INV_DSTIP); |
| |
| print_iface('i', e->ip.iniface, e->ip.iniface_mask, |
| e->ip.invflags & IPT_INV_VIA_IN); |
| |
| print_iface('o', e->ip.outiface, e->ip.outiface_mask, |
| e->ip.invflags & IPT_INV_VIA_OUT); |
| |
| print_proto(e->ip.proto, e->ip.invflags & XT_INV_PROTO); |
| |
| if (e->ip.flags & IPT_F_FRAG) |
| printf("%s -f", |
| e->ip.invflags & IPT_INV_FRAG ? " !" : ""); |
| |
| /* Print matchinfo part */ |
| if (e->target_offset) |
| IPT_MATCH_ITERATE(e, print_match_save, &e->ip); |
| |
| /* print counters for iptables -R */ |
| if (counters < 0) |
| printf(" -c %llu %llu", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt); |
| |
| /* Print target name and targinfo part */ |
| target_name = iptc_get_target(e, h); |
| t = ipt_get_target((struct ipt_entry *)e); |
| if (t->u.user.name[0]) { |
| const char *name = t->u.user.name; |
| const int revision = t->u.user.revision; |
| struct xtables_target *target, *tg, *tg2; |
| |
| target = xtables_find_target(name, XTF_TRY_LOAD); |
| if (!target) { |
| fprintf(stderr, "Can't find library for target `%s'\n", |
| name); |
| exit(1); |
| } |
| |
| tg = tg2 = xtables_find_target_revision(name, XTF_TRY_LOAD, |
| target, revision); |
| if (!tg2) |
| tg2 = target; |
| printf(" -j %s", tg2->alias ? tg2->alias(t) : target_name); |
| |
| if (tg && tg->save) |
| tg->save(&e->ip, t); |
| else if (target->save) |
| printf(unsupported_rev); |
| else { |
| /* If the target size is greater than xt_entry_target |
| * there is something to be saved, we just don't know |
| * how to print it */ |
| if (t->u.target_size != |
| sizeof(struct xt_entry_target)) { |
| fprintf(stderr, "Target `%s' is missing " |
| "save function\n", |
| name); |
| exit(1); |
| } |
| } |
| } else if (target_name && (*target_name != '\0')) |
| #ifdef IPT_F_GOTO |
| printf(" -%c %s", e->ip.flags & IPT_F_GOTO ? 'g' : 'j', target_name); |
| #else |
| printf(" -j %s", target_name); |
| #endif |
| |
| printf("\n"); |
| } |
| |
| static int |
| list_rules(const xt_chainlabel chain, int rulenum, int counters, |
| struct xtc_handle *handle) |
| { |
| const char *this = NULL; |
| int found = 0; |
| |
| if (counters) |
| counters = -1; /* iptables -c format */ |
| |
| /* Dump out chain names first, |
| * thereby preventing dependency conflicts */ |
| if (!rulenum) for (this = iptc_first_chain(handle); |
| this; |
| this = iptc_next_chain(handle)) { |
| if (chain && strcmp(this, chain) != 0) |
| continue; |
| |
| if (iptc_builtin(this, handle)) { |
| struct xt_counters count; |
| printf("-P %s %s", this, iptc_get_policy(this, &count, handle)); |
| if (counters) |
| printf(" -c %llu %llu", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt); |
| printf("\n"); |
| } else { |
| printf("-N %s\n", this); |
| } |
| } |
| |
| for (this = iptc_first_chain(handle); |
| this; |
| this = iptc_next_chain(handle)) { |
| const struct ipt_entry *e; |
| int num = 0; |
| |
| if (chain && strcmp(this, chain) != 0) |
| continue; |
| |
| /* Dump out rules */ |
| e = iptc_first_rule(this, handle); |
| while(e) { |
| num++; |
| if (!rulenum || num == rulenum) |
| print_rule4(e, handle, this, counters); |
| e = iptc_next_rule(e, handle); |
| } |
| found = 1; |
| } |
| |
| errno = ENOENT; |
| return found; |
| } |
| |
| static struct ipt_entry * |
| generate_entry(const struct ipt_entry *fw, |
| struct xtables_rule_match *matches, |
| struct xt_entry_target *target) |
| { |
| unsigned int size; |
| struct xtables_rule_match *matchp; |
| struct ipt_entry *e; |
| |
| size = sizeof(struct ipt_entry); |
| for (matchp = matches; matchp; matchp = matchp->next) |
| size += matchp->match->m->u.match_size; |
| |
| e = xtables_malloc(size + target->u.target_size); |
| *e = *fw; |
| e->target_offset = size; |
| e->next_offset = size + target->u.target_size; |
| |
| size = 0; |
| for (matchp = matches; matchp; matchp = matchp->next) { |
| memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size); |
| size += matchp->match->m->u.match_size; |
| } |
| memcpy(e->elems + size, target, target->u.target_size); |
| |
| return e; |
| } |
| |
| int do_command4(int argc, char *argv[], char **table, |
| struct xtc_handle **handle, bool restore) |
| { |
| struct iptables_command_state cs = { |
| .jumpto = "", |
| .argv = argv, |
| }; |
| struct ipt_entry *e = NULL; |
| unsigned int nsaddrs = 0, ndaddrs = 0; |
| struct in_addr *saddrs = NULL, *smasks = NULL; |
| struct in_addr *daddrs = NULL, *dmasks = NULL; |
| struct timeval wait_interval = { |
| .tv_sec = 1, |
| }; |
| bool wait_interval_set = false; |
| int verbose = 0; |
| int wait = 0; |
| const char *chain = NULL; |
| const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL; |
| const char *policy = NULL, *newname = NULL; |
| unsigned int rulenum = 0, command = 0; |
| const char *pcnt = NULL, *bcnt = NULL; |
| int ret = 1; |
| struct xtables_match *m; |
| struct xtables_rule_match *matchp; |
| struct xtables_target *t; |
| unsigned long long cnt; |
| bool table_set = false; |
| |
| /* re-set optind to 0 in case do_command4 gets called |
| * a second time */ |
| optind = 0; |
| |
| /* clear mflags in case do_command4 gets called a second time |
| * (we clear the global list of all matches for security)*/ |
| for (m = xtables_matches; m; m = m->next) |
| m->mflags = 0; |
| |
| for (t = xtables_targets; t; t = t->next) { |
| t->tflags = 0; |
| t->used = 0; |
| } |
| |
| /* Suppress error messages: we may add new options if we |
| demand-load a protocol. */ |
| opterr = 0; |
| opts = xt_params->orig_opts; |
| while ((cs.c = getopt_long(argc, argv, |
| "-:A:C:D:R:I:L::S::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:fbvw::W::nt:m:xc:g:46", |
| opts, NULL)) != -1) { |
| switch (cs.c) { |
| /* |
| * Command selection |
| */ |
| case 'A': |
| add_command(&command, CMD_APPEND, CMD_NONE, |
| cs.invert); |
| chain = optarg; |
| break; |
| |
| case 'C': |
| add_command(&command, CMD_CHECK, CMD_NONE, |
| cs.invert); |
| chain = optarg; |
| break; |
| |
| case 'D': |
| add_command(&command, CMD_DELETE, CMD_NONE, |
| cs.invert); |
| chain = optarg; |
| if (xs_has_arg(argc, argv)) { |
| rulenum = parse_rulenumber(argv[optind++]); |
| command = CMD_DELETE_NUM; |
| } |
| break; |
| |
| case 'R': |
| add_command(&command, CMD_REPLACE, CMD_NONE, |
| cs.invert); |
| chain = optarg; |
| if (xs_has_arg(argc, argv)) |
| rulenum = parse_rulenumber(argv[optind++]); |
| else |
| xtables_error(PARAMETER_PROBLEM, |
| "-%c requires a rule number", |
| cmd2char(CMD_REPLACE)); |
| break; |
| |
| case 'I': |
| add_command(&command, CMD_INSERT, CMD_NONE, |
| cs.invert); |
| chain = optarg; |
| if (xs_has_arg(argc, argv)) |
| rulenum = parse_rulenumber(argv[optind++]); |
| else rulenum = 1; |
| break; |
| |
| case 'L': |
| add_command(&command, CMD_LIST, |
| CMD_ZERO | CMD_ZERO_NUM, cs.invert); |
| if (optarg) chain = optarg; |
| else if (xs_has_arg(argc, argv)) |
| chain = argv[optind++]; |
| if (xs_has_arg(argc, argv)) |
| rulenum = parse_rulenumber(argv[optind++]); |
| break; |
| |
| case 'S': |
| add_command(&command, CMD_LIST_RULES, |
| CMD_ZERO|CMD_ZERO_NUM, cs.invert); |
| if (optarg) chain = optarg; |
| else if (xs_has_arg(argc, argv)) |
| chain = argv[optind++]; |
| if (xs_has_arg(argc, argv)) |
| rulenum = parse_rulenumber(argv[optind++]); |
| break; |
| |
| case 'F': |
| add_command(&command, CMD_FLUSH, CMD_NONE, |
| cs.invert); |
| if (optarg) chain = optarg; |
| else if (xs_has_arg(argc, argv)) |
| chain = argv[optind++]; |
| break; |
| |
| case 'Z': |
| add_command(&command, CMD_ZERO, CMD_LIST|CMD_LIST_RULES, |
| cs.invert); |
| if (optarg) chain = optarg; |
| else if (xs_has_arg(argc, argv)) |
| chain = argv[optind++]; |
| if (xs_has_arg(argc, argv)) { |
| rulenum = parse_rulenumber(argv[optind++]); |
| command = CMD_ZERO_NUM; |
| } |
| break; |
| |
| case 'N': |
| parse_chain(optarg); |
| add_command(&command, CMD_NEW_CHAIN, CMD_NONE, |
| cs.invert); |
| chain = optarg; |
| break; |
| |
| case 'X': |
| add_command(&command, CMD_DELETE_CHAIN, CMD_NONE, |
| cs.invert); |
| if (optarg) chain = optarg; |
| else if (xs_has_arg(argc, argv)) |
| chain = argv[optind++]; |
| break; |
| |
| case 'E': |
| add_command(&command, CMD_RENAME_CHAIN, CMD_NONE, |
| cs.invert); |
| chain = optarg; |
| if (xs_has_arg(argc, argv)) |
| newname = argv[optind++]; |
| else |
| xtables_error(PARAMETER_PROBLEM, |
| "-%c requires old-chain-name and " |
| "new-chain-name", |
| cmd2char(CMD_RENAME_CHAIN)); |
| break; |
| |
| case 'P': |
| add_command(&command, CMD_SET_POLICY, CMD_NONE, |
| cs.invert); |
| chain = optarg; |
| if (xs_has_arg(argc, argv)) |
| policy = argv[optind++]; |
| else |
| xtables_error(PARAMETER_PROBLEM, |
| "-%c requires a chain and a policy", |
| cmd2char(CMD_SET_POLICY)); |
| break; |
| |
| case 'h': |
| if (!optarg) |
| optarg = argv[optind]; |
| |
| /* iptables -p icmp -h */ |
| if (!cs.matches && cs.protocol) |
| xtables_find_match(cs.protocol, |
| XTF_TRY_LOAD, &cs.matches); |
| |
| exit_printhelp(cs.matches); |
| |
| /* |
| * Option selection |
| */ |
| case 'p': |
| set_option(&cs.options, OPT_PROTOCOL, &cs.fw.ip.invflags, |
| cs.invert); |
| |
| /* Canonicalize into lower case */ |
| for (cs.protocol = optarg; *cs.protocol; cs.protocol++) |
| *cs.protocol = tolower(*cs.protocol); |
| |
| cs.protocol = optarg; |
| cs.fw.ip.proto = xtables_parse_protocol(cs.protocol); |
| |
| if (cs.fw.ip.proto == 0 |
| && (cs.fw.ip.invflags & XT_INV_PROTO)) |
| xtables_error(PARAMETER_PROBLEM, |
| "rule would never match protocol"); |
| break; |
| |
| case 's': |
| set_option(&cs.options, OPT_SOURCE, &cs.fw.ip.invflags, |
| cs.invert); |
| shostnetworkmask = optarg; |
| break; |
| |
| case 'd': |
| set_option(&cs.options, OPT_DESTINATION, &cs.fw.ip.invflags, |
| cs.invert); |
| dhostnetworkmask = optarg; |
| break; |
| |
| #ifdef IPT_F_GOTO |
| case 'g': |
| set_option(&cs.options, OPT_JUMP, &cs.fw.ip.invflags, |
| cs.invert); |
| cs.fw.ip.flags |= IPT_F_GOTO; |
| cs.jumpto = xt_parse_target(optarg); |
| break; |
| #endif |
| |
| case 'j': |
| set_option(&cs.options, OPT_JUMP, &cs.fw.ip.invflags, |
| cs.invert); |
| command_jump(&cs, optarg); |
| break; |
| |
| |
| case 'i': |
| if (*optarg == '\0') |
| xtables_error(PARAMETER_PROBLEM, |
| "Empty interface is likely to be " |
| "undesired"); |
| set_option(&cs.options, OPT_VIANAMEIN, &cs.fw.ip.invflags, |
| cs.invert); |
| xtables_parse_interface(optarg, |
| cs.fw.ip.iniface, |
| cs.fw.ip.iniface_mask); |
| break; |
| |
| case 'o': |
| if (*optarg == '\0') |
| xtables_error(PARAMETER_PROBLEM, |
| "Empty interface is likely to be " |
| "undesired"); |
| set_option(&cs.options, OPT_VIANAMEOUT, &cs.fw.ip.invflags, |
| cs.invert); |
| xtables_parse_interface(optarg, |
| cs.fw.ip.outiface, |
| cs.fw.ip.outiface_mask); |
| break; |
| |
| case 'f': |
| set_option(&cs.options, OPT_FRAGMENT, &cs.fw.ip.invflags, |
| cs.invert); |
| cs.fw.ip.flags |= IPT_F_FRAG; |
| break; |
| |
| case 'v': |
| if (!verbose) |
| set_option(&cs.options, OPT_VERBOSE, |
| &cs.fw.ip.invflags, cs.invert); |
| verbose++; |
| break; |
| |
| case 'w': |
| if (restore) { |
| xtables_error(PARAMETER_PROBLEM, |
| "You cannot use `-w' from " |
| "iptables-restore"); |
| } |
| wait = parse_wait_time(argc, argv); |
| break; |
| |
| case 'W': |
| if (restore) { |
| xtables_error(PARAMETER_PROBLEM, |
| "You cannot use `-W' from " |
| "iptables-restore"); |
| } |
| parse_wait_interval(argc, argv, &wait_interval); |
| wait_interval_set = true; |
| break; |
| |
| case 'm': |
| command_match(&cs); |
| break; |
| |
| case 'n': |
| set_option(&cs.options, OPT_NUMERIC, &cs.fw.ip.invflags, |
| cs.invert); |
| break; |
| |
| case 't': |
| if (cs.invert) |
| xtables_error(PARAMETER_PROBLEM, |
| "unexpected ! flag before --table"); |
| if (restore && table_set) |
| xtables_error(PARAMETER_PROBLEM, |
| "The -t option (seen in line %u) cannot be used in %s.\n", |
| line, xt_params->program_name); |
| *table = optarg; |
| table_set = true; |
| break; |
| |
| case 'x': |
| set_option(&cs.options, OPT_EXPANDED, &cs.fw.ip.invflags, |
| cs.invert); |
| break; |
| |
| case 'V': |
| if (cs.invert) |
| printf("Not %s ;-)\n", prog_vers); |
| else |
| printf("%s v%s (legacy)\n", |
| prog_name, prog_vers); |
| exit(0); |
| |
| case '0': |
| set_option(&cs.options, OPT_LINENUMBERS, &cs.fw.ip.invflags, |
| cs.invert); |
| break; |
| |
| case 'M': |
| xtables_modprobe_program = optarg; |
| break; |
| |
| case 'c': |
| |
| set_option(&cs.options, OPT_COUNTERS, &cs.fw.ip.invflags, |
| cs.invert); |
| pcnt = optarg; |
| bcnt = strchr(pcnt + 1, ','); |
| if (bcnt) |
| bcnt++; |
| if (!bcnt && xs_has_arg(argc, argv)) |
| bcnt = argv[optind++]; |
| if (!bcnt) |
| xtables_error(PARAMETER_PROBLEM, |
| "-%c requires packet and byte counter", |
| opt2char(OPT_COUNTERS)); |
| |
| if (sscanf(pcnt, "%llu", &cnt) != 1) |
| xtables_error(PARAMETER_PROBLEM, |
| "-%c packet counter not numeric", |
| opt2char(OPT_COUNTERS)); |
| cs.fw.counters.pcnt = cnt; |
| |
| if (sscanf(bcnt, "%llu", &cnt) != 1) |
| xtables_error(PARAMETER_PROBLEM, |
| "-%c byte counter not numeric", |
| opt2char(OPT_COUNTERS)); |
| cs.fw.counters.bcnt = cnt; |
| break; |
| |
| case '4': |
| /* This is indeed the IPv4 iptables */ |
| break; |
| |
| case '6': |
| /* This is not the IPv6 ip6tables */ |
| if (line != -1) |
| return 1; /* success: line ignored */ |
| fprintf(stderr, "This is the IPv4 version of iptables.\n"); |
| exit_tryhelp(2); |
| |
| case 1: /* non option */ |
| if (optarg[0] == '!' && optarg[1] == '\0') { |
| if (cs.invert) |
| xtables_error(PARAMETER_PROBLEM, |
| "multiple consecutive ! not" |
| " allowed"); |
| cs.invert = true; |
| optarg[0] = '\0'; |
| continue; |
| } |
| fprintf(stderr, "Bad argument `%s'\n", optarg); |
| exit_tryhelp(2); |
| |
| default: |
| if (command_default(&cs, &iptables_globals) == 1) |
| /* cf. ip6tables.c */ |
| continue; |
| break; |
| } |
| cs.invert = false; |
| } |
| |
| if (!wait && wait_interval_set) |
| xtables_error(PARAMETER_PROBLEM, |
| "--wait-interval only makes sense with --wait\n"); |
| |
| if (strcmp(*table, "nat") == 0 && |
| ((policy != NULL && strcmp(policy, "DROP") == 0) || |
| (cs.jumpto != NULL && strcmp(cs.jumpto, "DROP") == 0))) |
| xtables_error(PARAMETER_PROBLEM, |
| "\nThe \"nat\" table is not intended for filtering, " |
| "the use of DROP is therefore inhibited.\n\n"); |
| |
| for (matchp = cs.matches; matchp; matchp = matchp->next) |
| xtables_option_mfcall(matchp->match); |
| if (cs.target != NULL) |
| xtables_option_tfcall(cs.target); |
| |
| /* Fix me: must put inverse options checking here --MN */ |
| |
| if (optind < argc) |
| xtables_error(PARAMETER_PROBLEM, |
| "unknown arguments found on commandline"); |
| if (!command) |
| xtables_error(PARAMETER_PROBLEM, "no command specified"); |
| if (cs.invert) |
| xtables_error(PARAMETER_PROBLEM, |
| "nothing appropriate following !"); |
| |
| if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND | CMD_CHECK)) { |
| if (!(cs.options & OPT_DESTINATION)) |
| dhostnetworkmask = "0.0.0.0/0"; |
| if (!(cs.options & OPT_SOURCE)) |
| shostnetworkmask = "0.0.0.0/0"; |
| } |
| |
| if (shostnetworkmask) |
| xtables_ipparse_multiple(shostnetworkmask, &saddrs, |
| &smasks, &nsaddrs); |
| |
| if (dhostnetworkmask) |
| xtables_ipparse_multiple(dhostnetworkmask, &daddrs, |
| &dmasks, &ndaddrs); |
| |
| if ((nsaddrs > 1 || ndaddrs > 1) && |
| (cs.fw.ip.invflags & (IPT_INV_SRCIP | IPT_INV_DSTIP))) |
| xtables_error(PARAMETER_PROBLEM, "! not allowed with multiple" |
| " source or destination IP addresses"); |
| |
| if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1)) |
| xtables_error(PARAMETER_PROBLEM, "Replacement rule does not " |
| "specify a unique address"); |
| |
| generic_opt_check(command, cs.options); |
| |
| /* Attempt to acquire the xtables lock */ |
| if (!restore) |
| xtables_lock_or_exit(wait, &wait_interval); |
| |
| /* only allocate handle if we weren't called with a handle */ |
| if (!*handle) |
| *handle = iptc_init(*table); |
| |
| /* try to insmod the module if iptc_init failed */ |
| if (!*handle && xtables_load_ko(xtables_modprobe_program, false) != -1) |
| *handle = iptc_init(*table); |
| |
| if (!*handle) |
| xtables_error(VERSION_PROBLEM, |
| "can't initialize iptables table `%s': %s", |
| *table, iptc_strerror(errno)); |
| |
| if (command == CMD_APPEND |
| || command == CMD_DELETE |
| || command == CMD_CHECK |
| || command == CMD_INSERT |
| || command == CMD_REPLACE) { |
| if (strcmp(chain, "PREROUTING") == 0 |
| || strcmp(chain, "INPUT") == 0) { |
| /* -o not valid with incoming packets. */ |
| if (cs.options & OPT_VIANAMEOUT) |
| xtables_error(PARAMETER_PROBLEM, |
| "Can't use -%c with %s\n", |
| opt2char(OPT_VIANAMEOUT), |
| chain); |
| } |
| |
| if (strcmp(chain, "POSTROUTING") == 0 |
| || strcmp(chain, "OUTPUT") == 0) { |
| /* -i not valid with outgoing packets */ |
| if (cs.options & OPT_VIANAMEIN) |
| xtables_error(PARAMETER_PROBLEM, |
| "Can't use -%c with %s\n", |
| opt2char(OPT_VIANAMEIN), |
| chain); |
| } |
| |
| if (cs.target && iptc_is_chain(cs.jumpto, *handle)) { |
| fprintf(stderr, |
| "Warning: using chain %s, not extension\n", |
| cs.jumpto); |
| |
| if (cs.target->t) |
| free(cs.target->t); |
| |
| cs.target = NULL; |
| } |
| |
| /* If they didn't specify a target, or it's a chain |
| name, use standard. */ |
| if (!cs.target |
| && (strlen(cs.jumpto) == 0 |
| || iptc_is_chain(cs.jumpto, *handle))) { |
| size_t size; |
| |
| cs.target = xtables_find_target(XT_STANDARD_TARGET, |
| XTF_LOAD_MUST_SUCCEED); |
| |
| size = sizeof(struct xt_entry_target) |
| + cs.target->size; |
| cs.target->t = xtables_calloc(1, size); |
| cs.target->t->u.target_size = size; |
| strcpy(cs.target->t->u.user.name, cs.jumpto); |
| if (!iptc_is_chain(cs.jumpto, *handle)) |
| cs.target->t->u.user.revision = cs.target->revision; |
| xs_init_target(cs.target); |
| } |
| |
| if (!cs.target) { |
| /* It is no chain, and we can't load a plugin. |
| * We cannot know if the plugin is corrupt, non |
| * existent OR if the user just misspelled a |
| * chain. |
| */ |
| #ifdef IPT_F_GOTO |
| if (cs.fw.ip.flags & IPT_F_GOTO) |
| xtables_error(PARAMETER_PROBLEM, |
| "goto '%s' is not a chain\n", |
| cs.jumpto); |
| #endif |
| xtables_find_target(cs.jumpto, XTF_LOAD_MUST_SUCCEED); |
| } else { |
| e = generate_entry(&cs.fw, cs.matches, cs.target->t); |
| free(cs.target->t); |
| } |
| } |
| |
| switch (command) { |
| case CMD_APPEND: |
| ret = append_entry(chain, e, |
| nsaddrs, saddrs, smasks, |
| ndaddrs, daddrs, dmasks, |
| cs.options&OPT_VERBOSE, |
| *handle); |
| break; |
| case CMD_DELETE: |
| ret = delete_entry(chain, e, |
| nsaddrs, saddrs, smasks, |
| ndaddrs, daddrs, dmasks, |
| cs.options&OPT_VERBOSE, |
| *handle, cs.matches, cs.target); |
| break; |
| case CMD_DELETE_NUM: |
| ret = iptc_delete_num_entry(chain, rulenum - 1, *handle); |
| break; |
| case CMD_CHECK: |
| ret = check_entry(chain, e, |
| nsaddrs, saddrs, smasks, |
| ndaddrs, daddrs, dmasks, |
| cs.options&OPT_VERBOSE, |
| *handle, cs.matches, cs.target); |
| break; |
| case CMD_REPLACE: |
| ret = replace_entry(chain, e, rulenum - 1, |
| saddrs, smasks, daddrs, dmasks, |
| cs.options&OPT_VERBOSE, *handle); |
| break; |
| case CMD_INSERT: |
| ret = insert_entry(chain, e, rulenum - 1, |
| nsaddrs, saddrs, smasks, |
| ndaddrs, daddrs, dmasks, |
| cs.options&OPT_VERBOSE, |
| *handle); |
| break; |
| case CMD_FLUSH: |
| ret = flush_entries4(chain, cs.options&OPT_VERBOSE, *handle); |
| break; |
| case CMD_ZERO: |
| ret = zero_entries(chain, cs.options&OPT_VERBOSE, *handle); |
| break; |
| case CMD_ZERO_NUM: |
| ret = iptc_zero_counter(chain, rulenum, *handle); |
| break; |
| case CMD_LIST: |
| case CMD_LIST|CMD_ZERO: |
| case CMD_LIST|CMD_ZERO_NUM: |
| ret = list_entries(chain, |
| rulenum, |
| cs.options&OPT_VERBOSE, |
| cs.options&OPT_NUMERIC, |
| cs.options&OPT_EXPANDED, |
| cs.options&OPT_LINENUMBERS, |
| *handle); |
| if (ret && (command & CMD_ZERO)) |
| ret = zero_entries(chain, |
| cs.options&OPT_VERBOSE, *handle); |
| if (ret && (command & CMD_ZERO_NUM)) |
| ret = iptc_zero_counter(chain, rulenum, *handle); |
| break; |
| case CMD_LIST_RULES: |
| case CMD_LIST_RULES|CMD_ZERO: |
| case CMD_LIST_RULES|CMD_ZERO_NUM: |
| ret = list_rules(chain, |
| rulenum, |
| cs.options&OPT_VERBOSE, |
| *handle); |
| if (ret && (command & CMD_ZERO)) |
| ret = zero_entries(chain, |
| cs.options&OPT_VERBOSE, *handle); |
| if (ret && (command & CMD_ZERO_NUM)) |
| ret = iptc_zero_counter(chain, rulenum, *handle); |
| break; |
| case CMD_NEW_CHAIN: |
| ret = iptc_create_chain(chain, *handle); |
| break; |
| case CMD_DELETE_CHAIN: |
| ret = delete_chain4(chain, cs.options&OPT_VERBOSE, *handle); |
| break; |
| case CMD_RENAME_CHAIN: |
| ret = iptc_rename_chain(chain, newname, *handle); |
| break; |
| case CMD_SET_POLICY: |
| ret = iptc_set_policy(chain, policy, cs.options&OPT_COUNTERS ? &cs.fw.counters : NULL, *handle); |
| break; |
| default: |
| /* We should never reach this... */ |
| exit_tryhelp(2); |
| } |
| |
| if (verbose > 1) |
| dump_entries(*handle); |
| |
| xtables_rule_matches_free(&cs.matches); |
| |
| if (e != NULL) { |
| free(e); |
| e = NULL; |
| } |
| |
| free(saddrs); |
| free(smasks); |
| free(daddrs); |
| free(dmasks); |
| xtables_free_opts(1); |
| |
| return ret; |
| } |