/* 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 : * Paul 'Rusty' Russell * Marc Boucher * James Morris * Harald Welte * Jozsef Kadlecsik * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "xshared.h" #ifndef TRUE #define TRUE 1 #endif #ifndef FALSE #define FALSE 0 #endif #define FMT_NUMERIC 0x0001 #define FMT_NOCOUNTS 0x0002 #define FMT_KILOMEGAGIGA 0x0004 #define FMT_OPTIONS 0x0008 #define FMT_NOTABLE 0x0010 #define FMT_NOTARGET 0x0020 #define FMT_VIA 0x0040 #define FMT_NONEWLINE 0x0080 #define FMT_LINENUMBERS 0x0100 #define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \ | FMT_NUMERIC | FMT_NOTABLE) #define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (tab)) #define CMD_NONE 0x0000U #define CMD_INSERT 0x0001U #define CMD_DELETE 0x0002U #define CMD_DELETE_NUM 0x0004U #define CMD_REPLACE 0x0008U #define CMD_APPEND 0x0010U #define CMD_LIST 0x0020U #define CMD_FLUSH 0x0040U #define CMD_ZERO 0x0080U #define CMD_NEW_CHAIN 0x0100U #define CMD_DELETE_CHAIN 0x0200U #define CMD_SET_POLICY 0x0400U #define CMD_RENAME_CHAIN 0x0800U #define CMD_LIST_RULES 0x1000U #define CMD_ZERO_NUM 0x2000U #define NUMBER_OF_CMD 15 static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z', 'Z', 'N', 'X', 'P', 'E', 'S' }; #define OPT_NONE 0x00000U #define OPT_NUMERIC 0x00001U #define OPT_SOURCE 0x00002U #define OPT_DESTINATION 0x00004U #define OPT_PROTOCOL 0x00008U #define OPT_JUMP 0x00010U #define OPT_VERBOSE 0x00020U #define OPT_EXPANDED 0x00040U #define OPT_VIANAMEIN 0x00080U #define OPT_VIANAMEOUT 0x00100U #define OPT_FRAGMENT 0x00200U #define OPT_LINENUMBERS 0x00400U #define OPT_COUNTERS 0x00800U #define NUMBER_OF_OPT 12 static const char optflags[NUMBER_OF_OPT] = { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', 'f', '0', 'c'}; static struct option original_opts[] = { {.name = "append", .has_arg = 1, .val = 'A'}, {.name = "delete", .has_arg = 1, .val = 'D'}, {.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 = "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'}, {NULL}, }; /* we need this for iptables-restore. iptables-restore.c sets line to the * current line of the input file, in order to give a more precise error * message. iptables itself doesn't need this, so it is initialized to the * magic number of -1 */ int line = -1; 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 = IPTABLES_VERSION, .orig_opts = original_opts, .exit_err = iptables_exit_error, }; /* Table of legal combinations of commands and options. If any of the * given commands make an option legal, that option is legal (applies to * CMD_LIST and CMD_ZERO only). * Key: * + compulsory * x illegal * optional */ static const char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] = /* Well, it's better than "Re: Linux vs FreeBSD" */ { /* -n -s -d -p -j -v -x -i -o -f --line -c */ /*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '}, /*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x','x'}, /*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x','x'}, /*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '}, /*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '}, /*LIST*/ {' ','x','x','x','x',' ',' ','x','x','x',' ','x'}, /*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, /*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, /*ZERO_NUM*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, /*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, /*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, /*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x','x',' '}, /*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'}, /*LIST_RULES*/{'x','x','x','x','x',' ','x','x','x','x','x','x'} }; static const int inverse_for_options[NUMBER_OF_OPT] = { /* -n */ 0, /* -s */ IPT_INV_SRCIP, /* -d */ IPT_INV_DSTIP, /* -p */ IPT_INV_PROTO, /* -j */ 0, /* -v */ 0, /* -x */ 0, /* -i */ IPT_INV_VIA_IN, /* -o */ IPT_INV_VIA_OUT, /* -f */ IPT_INV_FRAG, /*--line*/ 0, /* -c */ 0, }; #define opts iptables_globals.opts #define prog_name iptables_globals.program_name #define prog_vers iptables_globals.program_version int kernel_version; /* Primitive headers... */ /* defined in netinet/in.h */ #if 0 #ifndef IPPROTO_ESP #define IPPROTO_ESP 50 #endif #ifndef IPPROTO_AH #define IPPROTO_AH 51 #endif #endif static const char * proto_to_name(uint8_t proto, int nolookup) { unsigned int i; if (proto && !nolookup) { struct protoent *pent = getprotobynumber(proto); if (pent) return pent->p_name; } for (i = 0; xtables_chain_protos[i].name != NULL; ++i) if (xtables_chain_protos[i].num == proto) return xtables_chain_protos[i].name; return NULL; } enum { IPT_DOTTED_ADDR = 0, IPT_DOTTED_MASK }; 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 -[AD] 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" " --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" "[!] --proto -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" " --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= 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: ", 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); } static void generic_opt_check(int command, int options) { int i, j, legal = 0; /* Check that commands are valid with options. Complicated by the * fact that if an option is legal with *any* command given, it is * legal overall (ie. -z and -l). */ for (i = 0; i < NUMBER_OF_OPT; i++) { legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */ for (j = 0; j < NUMBER_OF_CMD; j++) { if (!(command & (1< 1; option >>= 1, ptr++); return *ptr; } static char cmd2char(int option) { const char *ptr; for (ptr = cmdflags; option > 1; option >>= 1, ptr++); return *ptr; } static void add_command(unsigned int *cmd, const int newcmd, const int othercmds, int invert) { if (invert) xtables_error(PARAMETER_PROBLEM, "unexpected ! flag"); if (*cmd & (~othercmds)) xtables_error(PARAMETER_PROBLEM, "Cannot use -%c with -%c\n", cmd2char(newcmd), cmd2char(*cmd & (~othercmds))); *cmd |= newcmd; } /* * 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 struct xtables_match * find_proto(const char *pname, enum xtables_tryload tryload, int nolookup, struct xtables_rule_match **matches) { unsigned int proto; if (xtables_strtoui(pname, NULL, &proto, 0, UINT8_MAX)) { const char *protoname = proto_to_name(proto, nolookup); if (protoname) return xtables_find_match(protoname, tryload, matches); } else return xtables_find_match(pname, tryload, matches); return NULL; } /* Can't be zero. */ static int parse_rulenumber(const char *rule) { unsigned int rulenum; if (!xtables_strtoui(rule, NULL, &rulenum, 1, INT_MAX)) xtables_error(PARAMETER_PROBLEM, "Invalid rule number `%s'", rule); return rulenum; } static const char * parse_target(const char *targetname) { const char *ptr; if (strlen(targetname) < 1) xtables_error(PARAMETER_PROBLEM, "Invalid target name (too short)"); if (strlen(targetname) >= XT_EXTENSION_MAXNAMELEN) xtables_error(PARAMETER_PROBLEM, "Invalid target name `%s' (%u chars max)", targetname, XT_EXTENSION_MAXNAMELEN - 1); for (ptr = targetname; *ptr; ptr++) if (isspace(*ptr)) xtables_error(PARAMETER_PROBLEM, "Invalid target name `%s'", targetname); return targetname; } 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_num(uint64_t number, unsigned int format) { if (format & FMT_KILOMEGAGIGA) { if (number > 99999) { number = (number + 500) / 1000; if (number > 9999) { number = (number + 500) / 1000; if (number > 9999) { number = (number + 500) / 1000; if (number > 9999) { number = (number + 500) / 1000; printf(FMT("%4lluT ","%lluT "), (unsigned long long)number); } else printf(FMT("%4lluG ","%lluG "), (unsigned long long)number); } else printf(FMT("%4lluM ","%lluM "), (unsigned long long)number); } else printf(FMT("%4lluK ","%lluK "), (unsigned long long)number); } else printf(FMT("%5llu ","%llu "), (unsigned long long)number); } else printf(FMT("%8llu ","%llu "), (unsigned long long)number); } static void print_header(unsigned int format, const char *chain, struct iptc_handle *handle) { struct ipt_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); print_num(counters.pcnt, (format|FMT_NOTABLE)); fputs("packets, ", stdout); 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 ipt_entry_match *m, const struct ipt_ip *ip, int numeric) { const struct xtables_match *match = xtables_find_match(m->u.user.name, XTF_TRY_LOAD, NULL); if (match) { if (match->print) match->print(ip, m, numeric); else printf("%s ", match->name); } else { if (m->u.user.name[0]) printf("UNKNOWN match `%s' ", m->u.user.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 iptc_handle *const handle) { const struct xtables_target *target = NULL; const struct ipt_entry_target *t; uint8_t flags; char buf[BUFSIZ]; if (!iptc_is_chain(targname, handle)) target = xtables_find_target(targname, XTF_TRY_LOAD); else target = xtables_find_target(IPT_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)) { print_num(fw->counters.pcnt, format); print_num(fw->counters.bcnt, format); } if (!(format & FMT_NOTARGET)) printf(FMT("%-9s ", "%s "), targname); fputc(fw->ip.invflags & IPT_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); } if (format & FMT_VIA) { char iface[IFNAMSIZ+2]; if (fw->ip.invflags & IPT_INV_VIA_IN) { iface[0] = '!'; iface[1] = '\0'; } else iface[0] = '\0'; if (fw->ip.iniface[0] != '\0') { strcat(iface, fw->ip.iniface); } else if (format & FMT_NUMERIC) strcat(iface, "*"); else strcat(iface, "any"); printf(FMT(" %-6s ","in %s "), iface); if (fw->ip.invflags & IPT_INV_VIA_OUT) { iface[0] = '!'; iface[1] = '\0'; } else iface[0] = '\0'; if (fw->ip.outiface[0] != '\0') { strcat(iface, fw->ip.outiface); } else if (format & FMT_NUMERIC) strcat(iface, "*"); else strcat(iface, "any"); printf(FMT("%-6s ","out %s "), iface); } fputc(fw->ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout); if (fw->ip.smsk.s_addr == 0L && !(format & FMT_NUMERIC)) printf(FMT("%-19s ","%s "), "anywhere"); else { if (format & FMT_NUMERIC) strcpy(buf, xtables_ipaddr_to_numeric(&fw->ip.src)); else strcpy(buf, xtables_ipaddr_to_anyname(&fw->ip.src)); strcat(buf, xtables_ipmask_to_numeric(&fw->ip.smsk)); printf(FMT("%-19s ","%s "), buf); } fputc(fw->ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout); if (fw->ip.dmsk.s_addr == 0L && !(format & FMT_NUMERIC)) printf(FMT("%-19s ","-> %s"), "anywhere"); else { if (format & FMT_NUMERIC) strcpy(buf, xtables_ipaddr_to_numeric(&fw->ip.dst)); else strcpy(buf, xtables_ipaddr_to_anyname(&fw->ip.dst)); strcat(buf, xtables_ipmask_to_numeric(&fw->ip.dmsk)); printf(FMT("%-19s ","-> %s"), buf); } 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) { if (target->print) /* Print the target information. */ target->print(&fw->ip, t, format & FMT_NUMERIC); } 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 iptc_handle *const h) { struct ipt_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 ipt_chainlabel chain, struct ipt_entry *fw, unsigned int nsaddrs, const struct in_addr saddrs[], const struct in_addr smasks[], unsigned int ndaddrs, const struct in_addr daddrs[], const struct in_addr dmasks[], int verbose, struct iptc_handle *handle) { 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 ipt_chainlabel chain, struct ipt_entry *fw, unsigned int rulenum, const struct in_addr *saddr, const struct in_addr *smask, const struct in_addr *daddr, const struct in_addr *dmask, int verbose, struct iptc_handle *handle) { 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 ipt_chainlabel chain, struct ipt_entry *fw, unsigned int rulenum, unsigned int nsaddrs, const struct in_addr saddrs[], const struct in_addr smasks[], unsigned int ndaddrs, const struct in_addr daddrs[], const struct in_addr dmasks[], int verbose, struct iptc_handle *handle) { 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 += IPT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size; mask = xtables_calloc(1, size + IPT_ALIGN(sizeof(struct ipt_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, IPT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->userspacesize); mptr += IPT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size; } memset(mptr, 0xFF, IPT_ALIGN(sizeof(struct ipt_entry_target)) + target->userspacesize); return mask; } static int delete_entry(const ipt_chainlabel chain, struct ipt_entry *fw, unsigned int nsaddrs, const struct in_addr saddrs[], const struct in_addr smasks[], unsigned int ndaddrs, const struct in_addr daddrs[], const struct in_addr dmasks[], int verbose, struct iptc_handle *handle, struct xtables_rule_match *matches, const struct xtables_target *target) { 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; } int for_each_chain(int (*fn)(const ipt_chainlabel, int, struct iptc_handle *), int verbose, int builtinstoo, struct iptc_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(ipt_chainlabel) * chaincount); i = 0; chain = iptc_first_chain(handle); while (chain) { strcpy(chains + i*sizeof(ipt_chainlabel), chain); i++; chain = iptc_next_chain(handle); } for (i = 0; i < chaincount; i++) { if (!builtinstoo && iptc_builtin(chains + i*sizeof(ipt_chainlabel), handle) == 1) continue; ret &= fn(chains + i*sizeof(ipt_chainlabel), verbose, handle); } free(chains); return ret; } int flush_entries(const ipt_chainlabel chain, int verbose, struct iptc_handle *handle) { if (!chain) return for_each_chain(flush_entries, verbose, 1, handle); if (verbose) fprintf(stdout, "Flushing chain `%s'\n", chain); return iptc_flush_entries(chain, handle); } static int zero_entries(const ipt_chainlabel chain, int verbose, struct iptc_handle *handle) { if (!chain) return for_each_chain(zero_entries, verbose, 1, handle); if (verbose) fprintf(stdout, "Zeroing chain `%s'\n", chain); return iptc_zero_entries(chain, handle); } int delete_chain(const ipt_chainlabel chain, int verbose, struct iptc_handle *handle) { if (!chain) return for_each_chain(delete_chain, verbose, 0, handle); if (verbose) fprintf(stdout, "Deleting chain `%s'\n", chain); return iptc_delete_chain(chain, handle); } static int list_entries(const ipt_chainlabel chain, int rulenum, int verbose, int numeric, int expanded, int linenumbers, struct iptc_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; } } printf(" "); } static int print_match_save(const struct ipt_entry_match *e, const struct ipt_ip *ip) { const struct xtables_match *match = xtables_find_match(e->u.user.name, XTF_TRY_LOAD, NULL); if (match) { printf("-m %s ", e->u.user.name); /* some matches don't provide a save function */ if (match->save) match->save(ip, e); } else { if (e->u.match_size) { fprintf(stderr, "Can't find library for match `%s'\n", e->u.user.name); exit(1); } } return 0; } /* print a given ip including mask if neccessary */ 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 neccessary fields. * Because that's the kind of world I want to live in. */ void print_rule(const struct ipt_entry *e, struct iptc_handle *h, const char *chain, int counters) { const struct ipt_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 & IPT_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 */ target_name = iptc_get_target(e, h); 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 /* Print targinfo part */ t = ipt_get_target((struct ipt_entry *)e); if (t->u.user.name[0]) { const struct xtables_target *target = xtables_find_target(t->u.user.name, XTF_TRY_LOAD); if (!target) { fprintf(stderr, "Can't find library for target `%s'\n", t->u.user.name); exit(1); } if (target->save) target->save(&e->ip, t); else { /* If the target size is greater than ipt_entry_target * there is something to be saved, we just don't know * how to print it */ if (t->u.target_size != sizeof(struct ipt_entry_target)) { fprintf(stderr, "Target `%s' is missing " "save function\n", t->u.user.name); exit(1); } } } printf("\n"); } static int list_rules(const ipt_chainlabel chain, int rulenum, int counters, struct iptc_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 ipt_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_rule(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 ipt_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; } static void clear_rule_matches(struct xtables_rule_match **matches) { struct xtables_rule_match *matchp, *tmp; for (matchp = *matches; matchp;) { tmp = matchp->next; if (matchp->match->m) { free(matchp->match->m); matchp->match->m = NULL; } if (matchp->match == matchp->match->next) { free(matchp->match); matchp->match = NULL; } free(matchp); matchp = tmp; } *matches = NULL; } void get_kernel_version(void) { static struct utsname uts; int x = 0, y = 0, z = 0; if (uname(&uts) == -1) { fprintf(stderr, "Unable to retrieve kernel version.\n"); xtables_free_opts(1); exit(1); } sscanf(uts.release, "%d.%d.%d", &x, &y, &z); kernel_version = LINUX_VERSION(x, y, z); } int do_command(int argc, char *argv[], char **table, struct iptc_handle **handle) { struct ipt_entry fw, *e = NULL; int invert = 0; unsigned int nsaddrs = 0, ndaddrs = 0; struct in_addr *saddrs = NULL, *smasks = NULL; struct in_addr *daddrs = NULL, *dmasks = NULL; int c, verbose = 0; const char *chain = NULL; const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL; const char *policy = NULL, *newname = NULL; unsigned int rulenum = 0, options = 0, command = 0; const char *pcnt = NULL, *bcnt = NULL; int ret = 1; struct xtables_match *m; struct xtables_rule_match *matches = NULL; struct xtables_rule_match *matchp; struct xtables_target *target = NULL; struct xtables_target *t; const char *jumpto = ""; char *protocol = NULL; int proto_used = 0; unsigned long long cnt; memset(&fw, 0, sizeof(fw)); /* re-set optind to 0 in case do_command gets called * a second time */ optind = 0; /* clear mflags in case do_command 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 ((c = getopt_long(argc, argv, "-A:D:R:I:L::S::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:fbvnt:m:xc:g:", opts, NULL)) != -1) { switch (c) { /* * Command selection */ case 'A': add_command(&command, CMD_APPEND, CMD_NONE, invert); chain = optarg; break; case 'D': add_command(&command, CMD_DELETE, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') { rulenum = parse_rulenumber(argv[optind++]); command = CMD_DELETE_NUM; } break; case 'R': add_command(&command, CMD_REPLACE, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') 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, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') rulenum = parse_rulenumber(argv[optind++]); else rulenum = 1; break; case 'L': add_command(&command, CMD_LIST, CMD_ZERO | CMD_ZERO_NUM, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') rulenum = parse_rulenumber(argv[optind++]); break; case 'S': add_command(&command, CMD_LIST_RULES, CMD_ZERO|CMD_ZERO_NUM, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') rulenum = parse_rulenumber(argv[optind++]); break; case 'F': add_command(&command, CMD_FLUSH, CMD_NONE, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; break; case 'Z': add_command(&command, CMD_ZERO, CMD_LIST|CMD_LIST_RULES, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') { rulenum = parse_rulenumber(argv[optind++]); command = CMD_ZERO_NUM; } break; case 'N': if (optarg && (*optarg == '-' || *optarg == '!')) xtables_error(PARAMETER_PROBLEM, "chain name not allowed to start " "with `%c'\n", *optarg); if (xtables_find_target(optarg, XTF_TRY_LOAD)) xtables_error(PARAMETER_PROBLEM, "chain name may not clash " "with target name\n"); add_command(&command, CMD_NEW_CHAIN, CMD_NONE, invert); chain = optarg; break; case 'X': add_command(&command, CMD_DELETE_CHAIN, CMD_NONE, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; break; case 'E': add_command(&command, CMD_RENAME_CHAIN, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') 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, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') 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 (!matches && protocol) xtables_find_match(protocol, XTF_TRY_LOAD, &matches); exit_printhelp(matches); /* * Option selection */ case 'p': xtables_check_inverse(optarg, &invert, &optind, argc, argv); set_option(&options, OPT_PROTOCOL, &fw.ip.invflags, invert); /* Canonicalize into lower case */ for (protocol = optarg; *protocol; protocol++) *protocol = tolower(*protocol); protocol = optarg; fw.ip.proto = xtables_parse_protocol(protocol); if (fw.ip.proto == 0 && (fw.ip.invflags & IPT_INV_PROTO)) xtables_error(PARAMETER_PROBLEM, "rule would never match protocol"); break; case 's': xtables_check_inverse(optarg, &invert, &optind, argc, argv); set_option(&options, OPT_SOURCE, &fw.ip.invflags, invert); shostnetworkmask = optarg; break; case 'd': xtables_check_inverse(optarg, &invert, &optind, argc, argv); set_option(&options, OPT_DESTINATION, &fw.ip.invflags, invert); dhostnetworkmask = optarg; break; #ifdef IPT_F_GOTO case 'g': set_option(&options, OPT_JUMP, &fw.ip.invflags, invert); fw.ip.flags |= IPT_F_GOTO; jumpto = parse_target(optarg); break; #endif case 'j': set_option(&options, OPT_JUMP, &fw.ip.invflags, invert); jumpto = parse_target(optarg); /* TRY_LOAD (may be chain name) */ target = xtables_find_target(jumpto, XTF_TRY_LOAD); if (target) { size_t size; size = IPT_ALIGN(sizeof(struct ipt_entry_target)) + target->size; target->t = xtables_calloc(1, size); target->t->u.target_size = size; strcpy(target->t->u.user.name, jumpto); target->t->u.user.revision = target->revision; if (target->init != NULL) target->init(target->t); opts = xtables_merge_options( iptables_globals.orig_opts, opts, target->extra_opts, &target->option_offset); if (opts == NULL) xtables_error(OTHER_PROBLEM, "can't alloc memory!"); } break; case 'i': if (*optarg == '\0') xtables_error(PARAMETER_PROBLEM, "Empty interface is likely to be " "undesired"); xtables_check_inverse(optarg, &invert, &optind, argc, argv); set_option(&options, OPT_VIANAMEIN, &fw.ip.invflags, invert); xtables_parse_interface(optarg, fw.ip.iniface, fw.ip.iniface_mask); break; case 'o': if (*optarg == '\0') xtables_error(PARAMETER_PROBLEM, "Empty interface is likely to be " "undesired"); xtables_check_inverse(optarg, &invert, &optind, argc, argv); set_option(&options, OPT_VIANAMEOUT, &fw.ip.invflags, invert); xtables_parse_interface(optarg, fw.ip.outiface, fw.ip.outiface_mask); break; case 'f': set_option(&options, OPT_FRAGMENT, &fw.ip.invflags, invert); fw.ip.flags |= IPT_F_FRAG; break; case 'v': if (!verbose) set_option(&options, OPT_VERBOSE, &fw.ip.invflags, invert); verbose++; break; case 'm': { size_t size; if (invert) xtables_error(PARAMETER_PROBLEM, "unexpected ! flag before --match"); m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, &matches); size = IPT_ALIGN(sizeof(struct ipt_entry_match)) + m->size; m->m = xtables_calloc(1, size); m->m->u.match_size = size; strcpy(m->m->u.user.name, m->name); m->m->u.user.revision = m->revision; if (m->init != NULL) m->init(m->m); if (m != m->next) { /* Merge options for non-cloned matches */ opts = xtables_merge_options( iptables_globals.orig_opts, opts, m->extra_opts, &m->option_offset); if (opts == NULL) xtables_error(OTHER_PROBLEM, "can't alloc memory!"); } } break; case 'n': set_option(&options, OPT_NUMERIC, &fw.ip.invflags, invert); break; case 't': if (invert) xtables_error(PARAMETER_PROBLEM, "unexpected ! flag before --table"); *table = optarg; break; case 'x': set_option(&options, OPT_EXPANDED, &fw.ip.invflags, invert); break; case 'V': if (invert) printf("Not %s ;-)\n", prog_vers); else printf("%s v%s\n", prog_name, prog_vers); exit(0); case '0': set_option(&options, OPT_LINENUMBERS, &fw.ip.invflags, invert); break; case 'M': xtables_modprobe_program = optarg; break; case 'c': set_option(&options, OPT_COUNTERS, &fw.ip.invflags, invert); pcnt = optarg; bcnt = strchr(pcnt + 1, ','); if (bcnt) bcnt++; if (!bcnt && optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') 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)); fw.counters.pcnt = cnt; if (sscanf(bcnt, "%llu", &cnt) != 1) xtables_error(PARAMETER_PROBLEM, "-%c byte counter not numeric", opt2char(OPT_COUNTERS)); fw.counters.bcnt = cnt; break; case 1: /* non option */ if (optarg[0] == '!' && optarg[1] == '\0') { if (invert) xtables_error(PARAMETER_PROBLEM, "multiple consecutive ! not" " allowed"); invert = TRUE; optarg[0] = '\0'; continue; } fprintf(stderr, "Bad argument `%s'\n", optarg); exit_tryhelp(2); default: if (target == NULL || target->parse == NULL || c < target->option_offset || c >= target->option_offset + XT_OPTION_OFFSET_SCALE || !target->parse(c - target->option_offset, argv, invert, &target->tflags, &fw, &target->t)) { for (matchp = matches; matchp; matchp = matchp->next) { if (matchp->completed || matchp->match->parse == NULL) continue; if (c < matchp->match->option_offset || c >= matchp->match->option_offset + XT_OPTION_OFFSET_SCALE) continue; if (matchp->match->parse(c - matchp->match->option_offset, argv, invert, &matchp->match->mflags, &fw, &matchp->match->m)) break; } m = matchp ? matchp->match : NULL; /* If you listen carefully, you can actually hear this code suck. */ /* some explanations (after four different bugs * in 3 different releases): If we encounter a * parameter, that has not been parsed yet, * it's not an option of an explicitly loaded * match or a target. However, we support * implicit loading of the protocol match * extension. '-p tcp' means 'l4 proto 6' and * at the same time 'load tcp protocol match on * demand if we specify --dport'. * * To make this work, we need to make sure: * - the parameter has not been parsed by * a match (m above) * - a protocol has been specified * - the protocol extension has not been * loaded yet, or is loaded and unused * [think of iptables-restore!] * - the protocol extension can be successively * loaded */ if (m == NULL && protocol && (!find_proto(protocol, XTF_DONT_LOAD, options&OPT_NUMERIC, NULL) || (find_proto(protocol, XTF_DONT_LOAD, options&OPT_NUMERIC, NULL) && (proto_used == 0)) ) && (m = find_proto(protocol, XTF_TRY_LOAD, options&OPT_NUMERIC, &matches))) { /* Try loading protocol */ size_t size; proto_used = 1; size = IPT_ALIGN(sizeof(struct ipt_entry_match)) + m->size; m->m = xtables_calloc(1, size); m->m->u.match_size = size; strcpy(m->m->u.user.name, m->name); m->m->u.user.revision = m->revision; if (m->init != NULL) m->init(m->m); opts = xtables_merge_options( iptables_globals.orig_opts, opts, m->extra_opts, &m->option_offset); if (opts == NULL) xtables_error(OTHER_PROBLEM, "can't alloc memory!"); optind--; continue; } if (!m) { if (c == '?') { if (optopt) { xtables_error( PARAMETER_PROBLEM, "option `%s' " "requires an " "argument", argv[optind-1]); } else { xtables_error( PARAMETER_PROBLEM, "unknown option " "`%s'", argv[optind-1]); } } xtables_error(PARAMETER_PROBLEM, "Unknown arg `%s'", optarg); } } } invert = FALSE; } if (strcmp(*table, "nat") == 0 && ((policy != NULL && strcmp(policy, "DROP") == 0) || (jumpto != NULL && strcmp(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 = matches; matchp; matchp = matchp->next) if (matchp->match->final_check != NULL) matchp->match->final_check(matchp->match->mflags); if (target != NULL && target->final_check != NULL) target->final_check(target->tflags); /* 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 (invert) xtables_error(PARAMETER_PROBLEM, "nothing appropriate following !"); if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND)) { if (!(options & OPT_DESTINATION)) dhostnetworkmask = "0.0.0.0/0"; if (!(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) && (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, options); if (chain != NULL && strlen(chain) >= XT_EXTENSION_MAXNAMELEN) xtables_error(PARAMETER_PROBLEM, "chain name `%s' too long (must be under %u chars)", chain, XT_EXTENSION_MAXNAMELEN); /* 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_INSERT || command == CMD_REPLACE) { if (strcmp(chain, "PREROUTING") == 0 || strcmp(chain, "INPUT") == 0) { /* -o not valid with incoming packets. */ if (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 (options & OPT_VIANAMEIN) xtables_error(PARAMETER_PROBLEM, "Can't use -%c with %s\n", opt2char(OPT_VIANAMEIN), chain); } if (target && iptc_is_chain(jumpto, *handle)) { fprintf(stderr, "Warning: using chain %s, not extension\n", jumpto); if (target->t) free(target->t); target = NULL; } /* If they didn't specify a target, or it's a chain name, use standard. */ if (!target && (strlen(jumpto) == 0 || iptc_is_chain(jumpto, *handle))) { size_t size; target = xtables_find_target(IPT_STANDARD_TARGET, XTF_LOAD_MUST_SUCCEED); size = sizeof(struct ipt_entry_target) + target->size; target->t = xtables_calloc(1, size); target->t->u.target_size = size; strcpy(target->t->u.user.name, jumpto); if (!iptc_is_chain(jumpto, *handle)) target->t->u.user.revision = target->revision; if (target->init != NULL) target->init(target->t); } if (!target) { /* it is no chain, and we can't load a plugin. * We cannot know if the plugin is corrupt, non * existant OR if the user just misspelled a * chain. */ #ifdef IPT_F_GOTO if (fw.ip.flags & IPT_F_GOTO) xtables_error(PARAMETER_PROBLEM, "goto '%s' is not a chain\n", jumpto); #endif xtables_find_target(jumpto, XTF_LOAD_MUST_SUCCEED); } else { e = generate_entry(&fw, matches, target->t); free(target->t); } } switch (command) { case CMD_APPEND: ret = append_entry(chain, e, nsaddrs, saddrs, smasks, ndaddrs, daddrs, dmasks, options&OPT_VERBOSE, *handle); break; case CMD_DELETE: ret = delete_entry(chain, e, nsaddrs, saddrs, smasks, ndaddrs, daddrs, dmasks, options&OPT_VERBOSE, *handle, matches, target); break; case CMD_DELETE_NUM: ret = iptc_delete_num_entry(chain, rulenum - 1, *handle); break; case CMD_REPLACE: ret = replace_entry(chain, e, rulenum - 1, saddrs, smasks, daddrs, dmasks, options&OPT_VERBOSE, *handle); break; case CMD_INSERT: ret = insert_entry(chain, e, rulenum - 1, nsaddrs, saddrs, smasks, ndaddrs, daddrs, dmasks, options&OPT_VERBOSE, *handle); break; case CMD_FLUSH: ret = flush_entries(chain, options&OPT_VERBOSE, *handle); break; case CMD_ZERO: ret = zero_entries(chain, 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, options&OPT_VERBOSE, options&OPT_NUMERIC, options&OPT_EXPANDED, options&OPT_LINENUMBERS, *handle); if (ret && (command & CMD_ZERO)) ret = zero_entries(chain, 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, options&OPT_VERBOSE, *handle); if (ret && (command & CMD_ZERO)) ret = zero_entries(chain, 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_chain(chain, 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, options&OPT_COUNTERS ? &fw.counters : NULL, *handle); break; default: /* We should never reach this... */ exit_tryhelp(2); } if (verbose > 1) dump_entries(*handle); clear_rule_matches(&matches); if (e != NULL) { free(e); e = NULL; } free(saddrs); free(smasks); free(daddrs); free(dmasks); xtables_free_opts(1); return ret; }