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TP-Link_Archer-XR500v/EN7526G_3.18Kernel_SDK/apps/public/iptables-1.4.10/iptables.c
Matheus Sampaio Queiroga aaca98136a
Add gpl
2024-07-22 01:58:46 -03:00

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/* 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 != 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;
}
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