iptables/ip6tables-restore.c - maze/iptables - Git at Google

 /* Code to restore the iptables state, from file by ip6tables-save.
  * Author:  Andras Kis-Szabo <kisza@sch.bme.hu>
  *
  * based on iptables-restore
  * Authors:
  *      Harald Welte <laforge@gnumonks.org>
  *      Rusty Russell <rusty@linuxcare.com.au>
  * This code is distributed under the terms of GNU GPL v2
  */

 #include <getopt.h>
 #include <sys/errno.h>
 #include <stdbool.h>
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include "ip6tables.h"
 #include "xtables.h"
 #include "libiptc/libip6tc.h"
 #include "ip6tables-multi.h"

 #ifdef DEBUG
 #define DEBUGP(x, args...) fprintf(stderr, x, ## args)
 #else
 #define DEBUGP(x, args...)
 #endif

 static int counters = 0, verbose = 0, noflush = 0;

 /* Keeping track of external matches and targets.  */
 static const struct option options[] = {
 	{.name = "counters", .has_arg = false, .val = 'c'},
 	{.name = "verbose",  .has_arg = false, .val = 'v'},
 	{.name = "test",     .has_arg = false, .val = 't'},
 	{.name = "help",     .has_arg = false, .val = 'h'},
 	{.name = "noflush",  .has_arg = false, .val = 'n'},
 	{.name = "modprobe", .has_arg = true,  .val = 'M'},
 	{.name = "table",    .has_arg = true,  .val = 'T'},
 	{NULL},
 };

 static void print_usage(const char *name, const char *version) __attribute__((noreturn));

 static void print_usage(const char *name, const char *version)
 {
 	fprintf(stderr, "Usage: %s [-c] [-v] [-t] [-h]\n"
 			"	   [ --counters ]\n"
 			"	   [ --verbose ]\n"
 			"	   [ --test ]\n"
 			"	   [ --help ]\n"
 			"	   [ --noflush ]\n"
 			"          [ --modprobe=<command>]\n", name);

 	exit(1);
 }

 static struct xtc_handle *create_handle(const char *tablename)
 {
 	struct xtc_handle *handle;

 	handle = ip6tc_init(tablename);

 	if (!handle) {
 		/* try to insmod the module if iptc_init failed */
 		xtables_load_ko(xtables_modprobe_program, false);
 		handle = ip6tc_init(tablename);
 	}

 	if (!handle) {
 		xtables_error(PARAMETER_PROBLEM, "%s: unable to initialize "
 			"table '%s'\n", ip6tables_globals.program_name,
 			tablename);
 		exit(1);
 	}
 	return handle;
 }

 static int parse_counters(char *string, struct xt_counters *ctr)
 {
 	unsigned long long pcnt, bcnt;
 	int ret;

 	ret = sscanf(string, "[%llu:%llu]", &pcnt, &bcnt);
 	ctr->pcnt = pcnt;
 	ctr->bcnt = bcnt;
 	return ret == 2;
 }

 /* global new argv and argc */
 static char *newargv[255];
 static int newargc;

 /* function adding one argument to newargv, updating newargc
  * returns true if argument added, false otherwise */
 static int add_argv(char *what) {
 	DEBUGP("add_argv: %s\n", what);
 	if (what && newargc + 1 < ARRAY_SIZE(newargv)) {
 		newargv[newargc] = strdup(what);
 		newargv[++newargc] = NULL;
 		return 1;
 	} else {
 		xtables_error(PARAMETER_PROBLEM,
 			"Parser cannot handle more arguments\n");
 		return 0;
 	}
 }

 static void free_argv(void) {
 	int i;

 	for (i = 0; i < newargc; i++)
 		free(newargv[i]);
 }

 static void add_param_to_argv(char *parsestart)
 {
 	int quote_open = 0, escaped = 0, param_len = 0;
 	char param_buffer[1024], *curchar;

 	/* After fighting with strtok enough, here's now
 	 * a 'real' parser. According to Rusty I'm now no
 	 * longer a real hacker, but I can live with that */

 	for (curchar = parsestart; *curchar; curchar++) {
 		if (quote_open) {
 			if (escaped) {
 				param_buffer[param_len++] = *curchar;
 				escaped = 0;
 				continue;
 			} else if (*curchar == '\\') {
 				escaped = 1;
 				continue;
 			} else if (*curchar == '"') {
 				quote_open = 0;
 				*curchar = ' ';
 			} else {
 				param_buffer[param_len++] = *curchar;
 				continue;
 			}
 		} else {
 			if (*curchar == '"') {
 				quote_open = 1;
 				continue;
 			}
 		}

 		if (*curchar == ' '
 		    || *curchar == '\t'
 		    || * curchar == '\n') {
 			if (!param_len) {
 				/* two spaces? */
 				continue;
 			}

 			param_buffer[param_len] = '\0';

 			/* check if table name specified */
 			if (!strncmp(param_buffer, "-t", 2)
                             || !strncmp(param_buffer, "--table", 8)) {
 				xtables_error(PARAMETER_PROBLEM,
 				"The -t option (seen in line %u) cannot be "
 				"used in ip6tables-restore.\n", line);
 				exit(1);
 			}

 			add_argv(param_buffer);
 			param_len = 0;
 		} else {
 			/* regular character, copy to buffer */
 			param_buffer[param_len++] = *curchar;

 			if (param_len >= sizeof(param_buffer))
 				xtables_error(PARAMETER_PROBLEM,
 				   "Parameter too long!");
 		}
 	}
 }

 int ip6tables_restore_main(int argc, char *argv[])
 {
 	struct xtc_handle *handle = NULL;
 	char buffer[10240];
 	int c;
 	char curtable[XT_TABLE_MAXNAMELEN + 1];
 	FILE *in;
 	int in_table = 0, testing = 0;
 	const char *tablename = NULL;
 	const struct xtc_ops *ops = &ip6tc_ops;

 	line = 0;

 	ip6tables_globals.program_name = "ip6tables-restore";
 	c = xtables_init_all(&ip6tables_globals, NFPROTO_IPV6);
 	if (c < 0) {
 		fprintf(stderr, "%s/%s Failed to initialize xtables\n",
 				ip6tables_globals.program_name,
 				ip6tables_globals.program_version);
 		exit(1);
 	}
 #if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
 	init_extensions();
 	init_extensions6();
 #endif

 	while ((c = getopt_long(argc, argv, "bcvthnM:T:", options, NULL)) != -1) {
 		switch (c) {
 			case 'b':
 				fprintf(stderr, "-b/--binary option is not implemented\n");
 				break;
 			case 'c':
 				counters = 1;
 				break;
 			case 'v':
 				verbose = 1;
 				break;
 			case 't':
 				testing = 1;
 				break;
 			case 'h':
 				print_usage("ip6tables-restore",
 					    IPTABLES_VERSION);
 				break;
 			case 'n':
 				noflush = 1;
 				break;
 			case 'M':
 				xtables_modprobe_program = optarg;
 				break;
 			case 'T':
 				tablename = optarg;
 				break;
 		}
 	}

 	if (optind == argc - 1) {
 		in = fopen(argv[optind], "re");
 		if (!in) {
 			fprintf(stderr, "Can't open %s: %s\n", argv[optind],
 				strerror(errno));
 			exit(1);
 		}
 	}
 	else if (optind < argc) {
 		fprintf(stderr, "Unknown arguments found on commandline\n");
 		exit(1);
 	}
 	else in = stdin;

 	/* Grab standard input. */
 	while (fgets(buffer, sizeof(buffer), in)) {
 		int ret = 0;

 		line++;
 		if (buffer[0] == '\n')
 			continue;
 		else if (buffer[0] == '#') {
 			if (verbose)
 				fputs(buffer, stdout);
 			continue;
 		} else if ((strcmp(buffer, "COMMIT\n") == 0) && (in_table)) {
 			if (!testing) {
 				DEBUGP("Calling commit\n");
 				ret = ops->commit(handle);
 				ops->free(handle);
 				handle = NULL;
 			} else {
 				DEBUGP("Not calling commit, testing\n");
 				ret = 1;
 			}
 			in_table = 0;
 		} else if ((buffer[0] == '*') && (!in_table)) {
 			/* New table */
 			char *table;

 			table = strtok(buffer+1, " \t\n");
 			DEBUGP("line %u, table '%s'\n", line, table);
 			if (!table) {
 				xtables_error(PARAMETER_PROBLEM,
 					"%s: line %u table name invalid\n",
 					xt_params->program_name, line);
 				exit(1);
 			}
 			strncpy(curtable, table, XT_TABLE_MAXNAMELEN);
 			curtable[XT_TABLE_MAXNAMELEN] = '\0';

 			if (tablename != NULL && strcmp(tablename, table) != 0)
 				continue;
 			if (handle)
 				ops->free(handle);

 			handle = create_handle(table);
 			if (noflush == 0) {
 				DEBUGP("Cleaning all chains of table '%s'\n",
 					table);
 				for_each_chain6(flush_entries6, verbose, 1,
 						handle);

 				DEBUGP("Deleting all user-defined chains "
 				       "of table '%s'\n", table);
 				for_each_chain6(delete_chain6, verbose, 0,
 						handle);
 			}

 			ret = 1;
 			in_table = 1;

 		} else if ((buffer[0] == ':') && (in_table)) {
 			/* New chain. */
 			char *policy, *chain;

 			chain = strtok(buffer+1, " \t\n");
 			DEBUGP("line %u, chain '%s'\n", line, chain);
 			if (!chain) {
 				xtables_error(PARAMETER_PROBLEM,
 					   "%s: line %u chain name invalid\n",
 					   xt_params->program_name, line);
 				exit(1);
 			}

 			if (strlen(chain) >= XT_EXTENSION_MAXNAMELEN)
 				xtables_error(PARAMETER_PROBLEM,
 					   "Invalid chain name `%s' "
 					   "(%u chars max)",
 					   chain, XT_EXTENSION_MAXNAMELEN - 1);

 			if (ops->builtin(chain, handle) <= 0) {
 				if (noflush && ops->is_chain(chain, handle)) {
 					DEBUGP("Flushing existing user defined chain '%s'\n", chain);
 					if (!ops->flush_entries(chain, handle))
 						xtables_error(PARAMETER_PROBLEM,
 							   "error flushing chain "
 							   "'%s':%s\n", chain,
 							   strerror(errno));
 				} else {
 					DEBUGP("Creating new chain '%s'\n", chain);
 					if (!ops->create_chain(chain, handle))
 						xtables_error(PARAMETER_PROBLEM,
 							   "error creating chain "
 							   "'%s':%s\n", chain,
 							   strerror(errno));
 				}
 			}

 			policy = strtok(NULL, " \t\n");
 			DEBUGP("line %u, policy '%s'\n", line, policy);
 			if (!policy) {
 				xtables_error(PARAMETER_PROBLEM,
 					   "%s: line %u policy invalid\n",
 					   xt_params->program_name, line);
 				exit(1);
 			}

 			if (strcmp(policy, "-") != 0) {
 				struct xt_counters count;

 				if (counters) {
 					char *ctrs;
 					ctrs = strtok(NULL, " \t\n");

 					if (!ctrs || !parse_counters(ctrs, &count))
 						xtables_error(PARAMETER_PROBLEM,
 							  "invalid policy counters "
 							  "for chain '%s'\n", chain);

 				} else {
 					memset(&count, 0, sizeof(count));
 				}

 				DEBUGP("Setting policy of chain %s to %s\n",
 					chain, policy);

 				if (!ops->set_policy(chain, policy, &count,
 						     handle))
 					xtables_error(OTHER_PROBLEM,
 						"Can't set policy `%s'"
 						" on `%s' line %u: %s\n",
 						policy, chain, line,
 						ops->strerror(errno));
 			}

 			ret = 1;

 		} else if (in_table) {
 			int a;
 			char *ptr = buffer;
 			char *pcnt = NULL;
 			char *bcnt = NULL;
 			char *parsestart;

 			/* reset the newargv */
 			newargc = 0;

 			if (buffer[0] == '[') {
 				/* we have counters in our input */
 				ptr = strchr(buffer, ']');
 				if (!ptr)
 					xtables_error(PARAMETER_PROBLEM,
 						   "Bad line %u: need ]\n",
 						   line);

 				pcnt = strtok(buffer+1, ":");
 				if (!pcnt)
 					xtables_error(PARAMETER_PROBLEM,
 						   "Bad line %u: need :\n",
 						   line);

 				bcnt = strtok(NULL, "]");
 				if (!bcnt)
 					xtables_error(PARAMETER_PROBLEM,
 						   "Bad line %u: need ]\n",
 						   line);

 				/* start command parsing after counter */
 				parsestart = ptr + 1;
 			} else {
 				/* start command parsing at start of line */
 				parsestart = buffer;
 			}

 			add_argv(argv[0]);
 			add_argv("-t");
 			add_argv(curtable);

 			if (counters && pcnt && bcnt) {
 				add_argv("--set-counters");
 				add_argv((char *) pcnt);
 				add_argv((char *) bcnt);
 			}

 			add_param_to_argv(parsestart);

 			DEBUGP("calling do_command6(%u, argv, &%s, handle):\n",
 				newargc, curtable);

 			for (a = 0; a < newargc; a++)
 				DEBUGP("argv[%u]: %s\n", a, newargv[a]);

 			ret = do_command6(newargc, newargv,
 					 &newargv[2], &handle, true);

 			free_argv();
 			fflush(stdout);
 		}
 		if (tablename != NULL && strcmp(tablename, curtable) != 0)
 			continue;
 		if (!ret) {
 			fprintf(stderr, "%s: line %u failed\n",
 					xt_params->program_name, line);
 			exit(1);
 		}
 	}
 	if (in_table) {
 		fprintf(stderr, "%s: COMMIT expected at line %u\n",
 				xt_params->program_name, line + 1);
 		exit(1);
 	}

 	fclose(in);
 	return 0;
 }
	/* Code to restore the iptables state, from file by ip6tables-save.
	* Author: Andras Kis-Szabo <kisza@sch.bme.hu>
	*
	* based on iptables-restore
	* Authors:
	* Harald Welte <laforge@gnumonks.org>
	* Rusty Russell <rusty@linuxcare.com.au>
	* This code is distributed under the terms of GNU GPL v2
	*/

	#include <getopt.h>
	#include <sys/errno.h>
	#include <stdbool.h>
	#include <string.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include "ip6tables.h"
	#include "xtables.h"
	#include "libiptc/libip6tc.h"
	#include "ip6tables-multi.h"

	#ifdef DEBUG
	#define DEBUGP(x, args...) fprintf(stderr, x, ## args)
	#else
	#define DEBUGP(x, args...)
	#endif

	static int counters = 0, verbose = 0, noflush = 0;

	/* Keeping track of external matches and targets. */
	static const struct option options[] = {
	{.name = "counters", .has_arg = false, .val = 'c'},
	{.name = "verbose", .has_arg = false, .val = 'v'},
	{.name = "test", .has_arg = false, .val = 't'},
	{.name = "help", .has_arg = false, .val = 'h'},
	{.name = "noflush", .has_arg = false, .val = 'n'},
	{.name = "modprobe", .has_arg = true, .val = 'M'},
	{.name = "table", .has_arg = true, .val = 'T'},
	{NULL},
	};

	static void print_usage(const char name, const char version) __attribute__((noreturn));

	static void print_usage(const char name, const char version)
	{
	fprintf(stderr, "Usage: %s [-c] [-v] [-t] [-h]\n"
	" [ --counters ]\n"
	" [ --verbose ]\n"
	" [ --test ]\n"
	" [ --help ]\n"
	" [ --noflush ]\n"
	" [ --modprobe=<command>]\n", name);

	exit(1);
	}

	static struct xtc_handle create_handle(const char tablename)
	{
	struct xtc_handle *handle;

	handle = ip6tc_init(tablename);

	if (!handle) {
	/* try to insmod the module if iptc_init failed */
	xtables_load_ko(xtables_modprobe_program, false);
	handle = ip6tc_init(tablename);
	}

	if (!handle) {
	xtables_error(PARAMETER_PROBLEM, "%s: unable to initialize "
	"table '%s'\n", ip6tables_globals.program_name,
	tablename);
	exit(1);
	}
	return handle;
	}

	static int parse_counters(char string, struct xt_counters ctr)
	{
	unsigned long long pcnt, bcnt;
	int ret;

	ret = sscanf(string, "[%llu:%llu]", &pcnt, &bcnt);
	ctr->pcnt = pcnt;
	ctr->bcnt = bcnt;
	return ret == 2;
	}

	/* global new argv and argc */
	static char *newargv[255];
	static int newargc;

	/* function adding one argument to newargv, updating newargc
	* returns true if argument added, false otherwise */
	static int add_argv(char *what) {
	DEBUGP("add_argv: %s\n", what);
	if (what && newargc + 1 < ARRAY_SIZE(newargv)) {
	newargv[newargc] = strdup(what);
	newargv[++newargc] = NULL;
	return 1;
	} else {
	xtables_error(PARAMETER_PROBLEM,
	"Parser cannot handle more arguments\n");
	return 0;
	}
	}

	static void free_argv(void) {
	int i;

	for (i = 0; i < newargc; i++)
	free(newargv[i]);
	}

	static void add_param_to_argv(char *parsestart)
	{
	int quote_open = 0, escaped = 0, param_len = 0;
	char param_buffer[1024], *curchar;

	/* After fighting with strtok enough, here's now
	* a 'real' parser. According to Rusty I'm now no
	* longer a real hacker, but I can live with that */

	for (curchar = parsestart; *curchar; curchar++) {
	if (quote_open) {
	if (escaped) {
	param_buffer[param_len++] = *curchar;
	escaped = 0;
	continue;
	} else if (*curchar == '\\') {
	escaped = 1;
	continue;
	} else if (*curchar == '"') {
	quote_open = 0;
	*curchar = ' ';
	} else {
	param_buffer[param_len++] = *curchar;
	continue;
	}
	} else {
	if (*curchar == '"') {
	quote_open = 1;
	continue;
	}
	}

	if (*curchar == ' '
	\|\| *curchar == '\t'
	\|\| * curchar == '\n') {
	if (!param_len) {
	/* two spaces? */
	continue;
	}

	param_buffer[param_len] = '\0';

	/* check if table name specified */
	if (!strncmp(param_buffer, "-t", 2)
	\|\| !strncmp(param_buffer, "--table", 8)) {
	xtables_error(PARAMETER_PROBLEM,
	"The -t option (seen in line %u) cannot be "
	"used in ip6tables-restore.\n", line);
	exit(1);
	}

	add_argv(param_buffer);
	param_len = 0;
	} else {
	/* regular character, copy to buffer */
	param_buffer[param_len++] = *curchar;

	if (param_len >= sizeof(param_buffer))
	xtables_error(PARAMETER_PROBLEM,
	"Parameter too long!");
	}
	}
	}

	int ip6tables_restore_main(int argc, char *argv[])
	{
	struct xtc_handle *handle = NULL;
	char buffer[10240];
	int c;
	char curtable[XT_TABLE_MAXNAMELEN + 1];
	FILE *in;
	int in_table = 0, testing = 0;
	const char *tablename = NULL;
	const struct xtc_ops *ops = &ip6tc_ops;

	line = 0;

	ip6tables_globals.program_name = "ip6tables-restore";
	c = xtables_init_all(&ip6tables_globals, NFPROTO_IPV6);
	if (c < 0) {
	fprintf(stderr, "%s/%s Failed to initialize xtables\n",
	ip6tables_globals.program_name,
	ip6tables_globals.program_version);
	exit(1);
	}
	#if defined(ALL_INCLUSIVE) \|\| defined(NO_SHARED_LIBS)
	init_extensions();
	init_extensions6();
	#endif

	while ((c = getopt_long(argc, argv, "bcvthnM:T:", options, NULL)) != -1) {
	switch (c) {
	case 'b':
	fprintf(stderr, "-b/--binary option is not implemented\n");
	break;
	case 'c':
	counters = 1;
	break;
	case 'v':
	verbose = 1;
	break;
	case 't':
	testing = 1;
	break;
	case 'h':
	print_usage("ip6tables-restore",
	IPTABLES_VERSION);
	break;
	case 'n':
	noflush = 1;
	break;
	case 'M':
	xtables_modprobe_program = optarg;
	break;
	case 'T':
	tablename = optarg;
	break;
	}
	}

	if (optind == argc - 1) {
	in = fopen(argv[optind], "re");
	if (!in) {
	fprintf(stderr, "Can't open %s: %s\n", argv[optind],
	strerror(errno));
	exit(1);
	}
	}
	else if (optind < argc) {
	fprintf(stderr, "Unknown arguments found on commandline\n");
	exit(1);
	}
	else in = stdin;

	/* Grab standard input. */
	while (fgets(buffer, sizeof(buffer), in)) {
	int ret = 0;

	line++;
	if (buffer[0] == '\n')
	continue;
	else if (buffer[0] == '#') {
	if (verbose)
	fputs(buffer, stdout);
	continue;
	} else if ((strcmp(buffer, "COMMIT\n") == 0) && (in_table)) {
	if (!testing) {
	DEBUGP("Calling commit\n");
	ret = ops->commit(handle);
	ops->free(handle);
	handle = NULL;
	} else {
	DEBUGP("Not calling commit, testing\n");
	ret = 1;
	}
	in_table = 0;
	} else if ((buffer[0] == '*') && (!in_table)) {
	/* New table */
	char *table;

	table = strtok(buffer+1, " \t\n");
	DEBUGP("line %u, table '%s'\n", line, table);
	if (!table) {
	xtables_error(PARAMETER_PROBLEM,
	"%s: line %u table name invalid\n",
	xt_params->program_name, line);
	exit(1);
	}
	strncpy(curtable, table, XT_TABLE_MAXNAMELEN);
	curtable[XT_TABLE_MAXNAMELEN] = '\0';

	if (tablename != NULL && strcmp(tablename, table) != 0)
	continue;
	if (handle)
	ops->free(handle);

	handle = create_handle(table);
	if (noflush == 0) {
	DEBUGP("Cleaning all chains of table '%s'\n",
	table);
	for_each_chain6(flush_entries6, verbose, 1,
	handle);

	DEBUGP("Deleting all user-defined chains "
	"of table '%s'\n", table);
	for_each_chain6(delete_chain6, verbose, 0,
	handle);
	}

	ret = 1;
	in_table = 1;

	} else if ((buffer[0] == ':') && (in_table)) {
	/* New chain. */
	char policy, chain;

	chain = strtok(buffer+1, " \t\n");
	DEBUGP("line %u, chain '%s'\n", line, chain);
	if (!chain) {
	xtables_error(PARAMETER_PROBLEM,
	"%s: line %u chain name invalid\n",
	xt_params->program_name, line);
	exit(1);
	}

	if (strlen(chain) >= XT_EXTENSION_MAXNAMELEN)
	xtables_error(PARAMETER_PROBLEM,
	"Invalid chain name `%s' "
	"(%u chars max)",
	chain, XT_EXTENSION_MAXNAMELEN - 1);

	if (ops->builtin(chain, handle) <= 0) {
	if (noflush && ops->is_chain(chain, handle)) {
	DEBUGP("Flushing existing user defined chain '%s'\n", chain);
	if (!ops->flush_entries(chain, handle))
	xtables_error(PARAMETER_PROBLEM,
	"error flushing chain "
	"'%s':%s\n", chain,
	strerror(errno));
	} else {
	DEBUGP("Creating new chain '%s'\n", chain);
	if (!ops->create_chain(chain, handle))
	xtables_error(PARAMETER_PROBLEM,
	"error creating chain "
	"'%s':%s\n", chain,
	strerror(errno));
	}
	}

	policy = strtok(NULL, " \t\n");
	DEBUGP("line %u, policy '%s'\n", line, policy);
	if (!policy) {
	xtables_error(PARAMETER_PROBLEM,
	"%s: line %u policy invalid\n",
	xt_params->program_name, line);
	exit(1);
	}

	if (strcmp(policy, "-") != 0) {
	struct xt_counters count;

	if (counters) {
	char *ctrs;
	ctrs = strtok(NULL, " \t\n");

	if (!ctrs \|\| !parse_counters(ctrs, &count))
	xtables_error(PARAMETER_PROBLEM,
	"invalid policy counters "
	"for chain '%s'\n", chain);

	} else {
	memset(&count, 0, sizeof(count));
	}

	DEBUGP("Setting policy of chain %s to %s\n",
	chain, policy);

	if (!ops->set_policy(chain, policy, &count,
	handle))
	xtables_error(OTHER_PROBLEM,
	"Can't set policy `%s'"
	" on `%s' line %u: %s\n",
	policy, chain, line,
	ops->strerror(errno));
	}

	ret = 1;

	} else if (in_table) {
	int a;
	char *ptr = buffer;
	char *pcnt = NULL;
	char *bcnt = NULL;
	char *parsestart;

	/* reset the newargv */
	newargc = 0;

	if (buffer[0] == '[') {
	/* we have counters in our input */
	ptr = strchr(buffer, ']');
	if (!ptr)
	xtables_error(PARAMETER_PROBLEM,
	"Bad line %u: need ]\n",
	line);

	pcnt = strtok(buffer+1, ":");
	if (!pcnt)
	xtables_error(PARAMETER_PROBLEM,
	"Bad line %u: need :\n",
	line);

	bcnt = strtok(NULL, "]");
	if (!bcnt)
	xtables_error(PARAMETER_PROBLEM,
	"Bad line %u: need ]\n",
	line);

	/* start command parsing after counter */
	parsestart = ptr + 1;
	} else {
	/* start command parsing at start of line */
	parsestart = buffer;
	}

	add_argv(argv[0]);
	add_argv("-t");
	add_argv(curtable);

	if (counters && pcnt && bcnt) {
	add_argv("--set-counters");
	add_argv((char *) pcnt);
	add_argv((char *) bcnt);
	}

	add_param_to_argv(parsestart);

	DEBUGP("calling do_command6(%u, argv, &%s, handle):\n",
	newargc, curtable);

	for (a = 0; a < newargc; a++)
	DEBUGP("argv[%u]: %s\n", a, newargv[a]);

	ret = do_command6(newargc, newargv,
	&newargv[2], &handle, true);

	free_argv();
	fflush(stdout);
	}
	if (tablename != NULL && strcmp(tablename, curtable) != 0)
	continue;
	if (!ret) {
	fprintf(stderr, "%s: line %u failed\n",
	xt_params->program_name, line);
	exit(1);
	}
	}
	if (in_table) {
	fprintf(stderr, "%s: COMMIT expected at line %u\n",
	xt_params->program_name, line + 1);
	exit(1);
	}

	fclose(in);
	return 0;
	}