diff options
Diffstat (limited to 'iptables/xtables.c')
| -rw-r--r-- | iptables/xtables.c | 1251 |
1 files changed, 1251 insertions, 0 deletions
diff --git a/iptables/xtables.c b/iptables/xtables.c new file mode 100644 index 00000000..a6875757 --- /dev/null +++ b/iptables/xtables.c @@ -0,0 +1,1251 @@ +/* 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 <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" +#include "nft.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 CMD_CHECK 0x4000U +#define NUMBER_OF_CMD 16 +static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z', + 'N', 'X', 'P', 'E', 'S', 'Z', 'C' }; + +#define OPT_FRAGMENT 0x00800U +#define NUMBER_OF_OPT ARRAY_SIZE(optflags) +static const char optflags[] += { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', '0', 'c', 'f'}; + +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 = "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 xtables_globals = { + .option_offset = 0, + .program_version = IPTABLES_VERSION, + .orig_opts = original_opts, + .exit_err = iptables_exit_error, + .compat_rev = nft_compatible_revision, +}; + +/* 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 --line -c -f */ +/*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'}, +/*CHECK*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x',' '}, +}; + +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 xtables_globals.opts +#define prog_name xtables_globals.program_name +#define prog_vers xtables_globals.program_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 + +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 -[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" +"[!] --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=<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); +} + +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<<j))) + continue; + + if (!(options & (1<<i))) { + if (commands_v_options[j][i] == '+') + xtables_error(PARAMETER_PROBLEM, + "You need to supply the `-%c' " + "option for this command\n", + optflags[i]); + } else { + if (commands_v_options[j][i] != 'x') + legal = 1; + else if (legal == 0) + legal = -1; + } + } + if (legal == -1) + xtables_error(PARAMETER_PROBLEM, + "Illegal option `-%c' with this command\n", + optflags[i]); + } +} + +static char +opt2char(int option) +{ + const char *ptr; + for (ptr = optflags; option > 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'. */ +/* 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 int +add_entry(const char *chain, + const char *table, + struct iptables_command_state *cs, + 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 nft_handle *h, bool append) +{ + unsigned int i, j; + int ret = 1; + + for (i = 0; i < nsaddrs; i++) { + cs->fw.ip.src.s_addr = saddrs[i].s_addr; + cs->fw.ip.smsk.s_addr = smasks[i].s_addr; + for (j = 0; j < ndaddrs; j++) { + cs->fw.ip.dst.s_addr = daddrs[j].s_addr; + cs->fw.ip.dmsk.s_addr = dmasks[j].s_addr; + + ret = nft_rule_add(h, chain, table, cs, append, verbose); + } + } + + return ret; +} + +static int +replace_entry(const char *chain, const char *table, + struct iptables_command_state *cs, + unsigned int rulenum, + const struct in_addr *saddr, const struct in_addr *smask, + const struct in_addr *daddr, const struct in_addr *dmask, + bool verbose, struct nft_handle *h) +{ + cs->fw.ip.src.s_addr = saddr->s_addr; + cs->fw.ip.dst.s_addr = daddr->s_addr; + cs->fw.ip.smsk.s_addr = smask->s_addr; + cs->fw.ip.dmsk.s_addr = dmask->s_addr; + + return nft_rule_replace(h, chain, table, cs, rulenum, verbose); +} + +static int +delete_entry(const char *chain, const char *table, + struct iptables_command_state *cs, + 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 nft_handle *h) +{ + unsigned int i, j; + int ret = 1; + + for (i = 0; i < nsaddrs; i++) { + cs->fw.ip.src.s_addr = saddrs[i].s_addr; + cs->fw.ip.smsk.s_addr = smasks[i].s_addr; + for (j = 0; j < ndaddrs; j++) { + cs->fw.ip.dst.s_addr = daddrs[j].s_addr; + cs->fw.ip.dmsk.s_addr = dmasks[j].s_addr; + ret = nft_rule_delete(h, chain, table, cs, verbose); + } + } + + return ret; +} + +static int +check_entry(const char *chain, const char *table, + struct iptables_command_state *cs, + 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 nft_handle *h) +{ + unsigned int i, j; + int ret = 1; + + for (i = 0; i < nsaddrs; i++) { + cs->fw.ip.src.s_addr = saddrs[i].s_addr; + cs->fw.ip.smsk.s_addr = smasks[i].s_addr; + for (j = 0; j < ndaddrs; j++) { + cs->fw.ip.dst.s_addr = daddrs[j].s_addr; + cs->fw.ip.dmsk.s_addr = dmasks[j].s_addr; + ret = nft_rule_check(h, chain, table, cs, verbose); + } + } + + return ret; +} + +static int +zero_entries(const xt_chainlabel chain, int verbose, + struct xtc_handle *handle) +{ + /* XXX iterate over chains and reset counters */ + return 1; +} + +static int +list_entries(struct nft_handle *h, const char *chain, const char *table, + int rulenum, int verbose, int numeric, int expanded, + int linenumbers) +{ + unsigned int format; + + 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; + + /* FIXME should return found or not, and errno = ENOENT in such case */ + return nft_rule_list(h, chain, table, rulenum, format); +} + +static int +list_rules(struct nft_handle *h, const char *chain, const char *table, + int rulenum, int counters) +{ + if (counters) + counters = -1; /* iptables -c format */ + + nft_rule_list_save(h, chain, table, rulenum, counters); + + /* FIXME found */ + return 1; +} + +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; +} + +static void command_jump(struct iptables_command_state *cs) +{ + size_t size; + + set_option(&cs->options, OPT_JUMP, &cs->fw.ip.invflags, cs->invert); + cs->jumpto = parse_target(optarg); + /* TRY_LOAD (may be chain name) */ + cs->target = xtables_find_target(cs->jumpto, XTF_TRY_LOAD); + + if (cs->target == NULL) + return; + + size = XT_ALIGN(sizeof(struct xt_entry_target)) + + cs->target->size; + + cs->target->t = xtables_calloc(1, size); + cs->target->t->u.target_size = size; + if (cs->target->real_name == NULL) { + strcpy(cs->target->t->u.user.name, cs->jumpto); + } else { + /* Alias support for userspace side */ + strcpy(cs->target->t->u.user.name, cs->target->real_name); + if (!(cs->target->ext_flags & XTABLES_EXT_ALIAS)) + fprintf(stderr, "Notice: The %s target is converted into %s target " + "in rule listing and saving.\n", + cs->jumpto, cs->target->real_name); + } + cs->target->t->u.user.revision = cs->target->revision; + xs_init_target(cs->target); + + if (cs->target->x6_options != NULL) + opts = xtables_options_xfrm(iptables_globals.orig_opts, opts, + cs->target->x6_options, + &cs->target->option_offset); + else + opts = xtables_merge_options(iptables_globals.orig_opts, opts, + cs->target->extra_opts, + &cs->target->option_offset); + if (opts == NULL) + xtables_error(OTHER_PROBLEM, "can't alloc memory!"); +} + +static void command_match(struct iptables_command_state *cs) +{ + struct xtables_match *m; + size_t size; + + if (cs->invert) + xtables_error(PARAMETER_PROBLEM, + "unexpected ! flag before --match"); + + m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, &cs->matches); + size = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size; + m->m = xtables_calloc(1, size); + m->m->u.match_size = size; + if (m->real_name == NULL) { + strcpy(m->m->u.user.name, m->name); + } else { + strcpy(m->m->u.user.name, m->real_name); + if (!(m->ext_flags & XTABLES_EXT_ALIAS)) + fprintf(stderr, "Notice: the %s match is converted into %s match " + "in rule listing and saving.\n", m->name, m->real_name); + } + m->m->u.user.revision = m->revision; + xs_init_match(m); + if (m == m->next) + return; + /* Merge options for non-cloned matches */ + if (m->x6_options != NULL) + opts = xtables_options_xfrm(iptables_globals.orig_opts, opts, + m->x6_options, &m->option_offset); + else if (m->extra_opts != NULL) + 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!"); +} + +int do_commandx(struct nft_handle *h, int argc, char *argv[], char **table) +{ + struct iptables_command_state cs; + unsigned int nsaddrs = 0, ndaddrs = 0; + struct in_addr *saddrs = NULL, *smasks = NULL; + struct in_addr *daddrs = NULL, *dmasks = NULL; + + int verbose = 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; + + memset(&cs, 0, sizeof(cs)); + cs.jumpto = ""; + cs.argv = argv; + + /* 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:fbvnt: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 (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, + cs.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, + cs.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, cs.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, cs.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, + cs.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, + cs.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, + cs.invert); + chain = optarg; + break; + + case 'X': + add_command(&command, CMD_DELETE_CHAIN, CMD_NONE, + cs.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, + cs.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, + cs.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 (!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 = parse_target(optarg); + break; +#endif + + case 'j': + command_jump(&cs); + 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 '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"); + *table = optarg; + 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\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 && 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)); + cs.counters.pcnt = cnt; + + if (sscanf(bcnt, "%llu", &cnt) != 1) + xtables_error(PARAMETER_PROBLEM, + "-%c byte counter not numeric", + opt2char(OPT_COUNTERS)); + cs.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 (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); + + 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); + + 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); + } + + /* + * Contrary to what iptables does, we assume that any jumpto + * is a custom chain jumps (if no target is found). Later on, + * nf_table will spot the error if the chain does not exists. + */ + } + + switch (command) { + case CMD_APPEND: + ret = add_entry(chain, *table, &cs, + nsaddrs, saddrs, smasks, + ndaddrs, daddrs, dmasks, + cs.options&OPT_VERBOSE, + h, true); + break; + case CMD_DELETE: + ret = delete_entry(chain, *table, &cs, + nsaddrs, saddrs, smasks, + ndaddrs, daddrs, dmasks, + cs.options&OPT_VERBOSE, h); + break; + case CMD_DELETE_NUM: + ret = nft_rule_delete_num(h, chain, *table, rulenum - 1, verbose); + break; + case CMD_CHECK: + ret = check_entry(chain, *table, &cs, + nsaddrs, saddrs, smasks, + ndaddrs, daddrs, dmasks, + cs.options&OPT_VERBOSE, h); + break; + case CMD_REPLACE: + /* FIXME replace at rulenum */ + ret = replace_entry(chain, *table, &cs, rulenum - 1, + saddrs, smasks, daddrs, dmasks, + cs.options&OPT_VERBOSE, h); + break; + case CMD_INSERT: + /* FIXME insert at rulenum */ + ret = add_entry(chain, *table, &cs, + nsaddrs, saddrs, smasks, + ndaddrs, daddrs, dmasks, + cs.options&OPT_VERBOSE, h, false); + break; + case CMD_FLUSH: + ret = nft_rule_flush(h, chain, *table); + break; + case CMD_ZERO: + /* FIXME */ +// ret = zero_entries(chain, cs.options&OPT_VERBOSE, *handle); + break; + case CMD_ZERO_NUM: + /* FIXME */ +// ret = iptc_zero_counter(chain, rulenum, *handle); + break; + case CMD_LIST: + case CMD_LIST|CMD_ZERO: + case CMD_LIST|CMD_ZERO_NUM: + /* FIXME */ + ret = list_entries(h, chain, *table, + rulenum, + cs.options&OPT_VERBOSE, + cs.options&OPT_NUMERIC, + cs.options&OPT_EXPANDED, + cs.options&OPT_LINENUMBERS); +/* 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: + /* FIXME */ + ret = list_rules(h, chain, *table, rulenum, cs.options&OPT_VERBOSE); +/* 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 = nft_chain_user_add(h, chain, *table); + break; + case CMD_DELETE_CHAIN: + ret = nft_chain_user_del(h, chain, *table); + break; + case CMD_RENAME_CHAIN: + /* XXX iptables allows renaming an used chain, we don't */ + ret = nft_chain_user_rename(h, chain, *table, newname); + break; + case CMD_SET_POLICY: + ret = nft_chain_set(h, *table, chain, policy, NULL); + if (ret < 0) + xtables_error(PARAMETER_PROBLEM, "Wrong policy `%s'\n", + policy); + break; + default: + /* We should never reach this... */ + exit_tryhelp(2); + } + +/* if (verbose > 1) + dump_entries(*handle); */ + + clear_rule_matches(&cs.matches); + + free(saddrs); + free(smasks); + free(daddrs); + free(dmasks); + xtables_free_opts(1); + + return ret; +} |