Git init

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;
+}