diff options
Diffstat (limited to 'iptables.c')
| -rw-r--r-- | iptables.c | 2072 |
1 files changed, 2072 insertions, 0 deletions
diff --git a/iptables.c b/iptables.c new file mode 100644 index 0000000..19f6d4f --- /dev/null +++ b/iptables.c @@ -0,0 +1,2072 @@ +/* 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 <sys/utsname.h> +#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, + .opts = original_opts, + .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 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 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(u_int8_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(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=<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: ", 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<<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'. */ +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, u_int8_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(u_int64_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) +{ + 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) +{ + struct xtables_target *target = NULL; + const struct ipt_entry_target *t; + u_int8_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(struct xtables_rule_match *matches, + const struct xtables_target *target) +{ + /* Establish mask for comparison */ + unsigned int size; + 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(u_int16_t proto, int invert) +{ + if (proto) { + unsigned int i; + const char *invertstr = invert ? "! " : ""; + + 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) +{ + 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(char *prefix, u_int32_t ip, u_int32_t mask, int invert) +{ + u_int32_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) +{ + 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]) { + 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; + + 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(opts, + target->extra_opts, + &target->option_offset); + if (opts == NULL) + xtables_error(OTHER_PROBLEM, + "can't alloc memory!"); + } + break; + + + case 'i': + 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': + 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(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 || + !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 (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(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 && strlen(chain) > IPT_FUNCTION_MAXNAMELEN) + xtables_error(PARAMETER_PROBLEM, + "chain name `%s' too long (must be under %i chars)", + chain, IPT_FUNCTION_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; +} |