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/* Code to restore the iptables state, from file by iptables-save.
* (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
* based on previous code from Rusty Russell <rusty@linuxcare.com.au>
*
* This code is distributed under the terms of GNU GPL v2
*
* $Id$
*/
#include <getopt.h>
#include <sys/errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "iptables.h"
#include "libiptc/libiptc.h"
#ifdef DEBUG
#define DEBUGP(x, args...) fprintf(stderr, x, ## args)
#else
#define DEBUGP(x, args...)
#endif
static int binary = 0, counters = 0, verbose = 0, noflush = 0;
/* Keeping track of external matches and targets. */
static struct option options[] = {
{ "binary", 0, 0, 'b' },
{ "counters", 0, 0, 'c' },
{ "verbose", 0, 0, 'v' },
{ "test", 0, 0, 't' },
{ "help", 0, 0, 'h' },
{ "noflush", 0, 0, 'n'},
{ "modprobe", 1, 0, 'M'},
{ 0 }
};
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 [-b] [-c] [-v] [-t] [-h]\n"
" [ --binary ]\n"
" [ --counters ]\n"
" [ --verbose ]\n"
" [ --test ]\n"
" [ --help ]\n"
" [ --noflush ]\n"
" [ --modprobe=<command>]\n", name);
exit(1);
}
iptc_handle_t create_handle(const char *tablename, const char* modprobe )
{
iptc_handle_t handle;
handle = iptc_init(tablename);
if (!handle) {
/* try to insmod the module if iptc_init failed */
iptables_insmod("ip_tables", modprobe);
handle = iptc_init(tablename);
}
if (!handle) {
exit_error(PARAMETER_PROBLEM, "%s: unable to initialize"
"table '%s'\n", program_name, tablename);
exit(1);
}
return handle;
}
int parse_counters(char *string, struct ipt_counters *ctr)
{
return (sscanf(string, "[%llu:%llu]", (unsigned long long *)&ctr->pcnt, (unsigned long long *)&ctr->bcnt) == 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) < sizeof(newargv)/sizeof(char *))) {
newargv[newargc] = strdup(what);
newargc++;
return 1;
} else
return 0;
}
static void free_argv(void) {
int i;
for (i = 0; i < newargc; i++)
free(newargv[i]);
}
#ifdef IPTABLES_MULTI
int
iptables_restore_main(int argc, char *argv[])
#else
int
main(int argc, char *argv[])
#endif
{
iptc_handle_t handle = NULL;
char buffer[10240];
int c;
char curtable[IPT_TABLE_MAXNAMELEN + 1];
FILE *in;
const char *modprobe = 0;
int in_table = 0, testing = 0;
program_name = "iptables-restore";
program_version = IPTABLES_VERSION;
line = 0;
lib_dir = getenv("IPTABLES_LIB_DIR");
if (!lib_dir)
lib_dir = IPT_LIB_DIR;
#ifdef NO_SHARED_LIBS
init_extensions();
#endif
while ((c = getopt_long(argc, argv, "bcvthnM:", options, NULL)) != -1) {
switch (c) {
case 'b':
binary = 1;
break;
case 'c':
counters = 1;
break;
case 'v':
verbose = 1;
break;
case 't':
testing = 1;
break;
case 'h':
print_usage("iptables-restore",
IPTABLES_VERSION);
break;
case 'n':
noflush = 1;
break;
case 'M':
modprobe = optarg;
break;
}
}
if (optind == argc - 1) {
in = fopen(argv[optind], "r");
if (!in) {
fprintf(stderr, "Can't open %s: %s", argv[optind],
strerror(errno));
exit(1);
}
}
else if (optind < argc) {
fprintf(stderr, "Unknown arguments found on commandline");
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 = iptc_commit(&handle);
} 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) {
exit_error(PARAMETER_PROBLEM,
"%s: line %u table name invalid\n",
program_name, line);
exit(1);
}
strncpy(curtable, table, IPT_TABLE_MAXNAMELEN);
curtable[IPT_TABLE_MAXNAMELEN] = '\0';
if (handle)
iptc_free(&handle);
handle = create_handle(table, modprobe);
if (noflush == 0) {
DEBUGP("Cleaning all chains of table '%s'\n",
table);
for_each_chain(flush_entries, verbose, 1,
&handle);
DEBUGP("Deleting all user-defined chains "
"of table '%s'\n", table);
for_each_chain(delete_chain, 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) {
exit_error(PARAMETER_PROBLEM,
"%s: line %u chain name invalid\n",
program_name, line);
exit(1);
}
if (iptc_builtin(chain, handle) <= 0) {
if (noflush && iptc_is_chain(chain, handle)) {
DEBUGP("Flushing existing user defined chain '%s'\n", chain);
if (!iptc_flush_entries(chain, &handle))
exit_error(PARAMETER_PROBLEM,
"error flushing chain "
"'%s':%s\n", chain,
strerror(errno));
} else {
DEBUGP("Creating new chain '%s'\n", chain);
if (!iptc_create_chain(chain, &handle))
exit_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) {
exit_error(PARAMETER_PROBLEM,
"%s: line %u policy invalid\n",
program_name, line);
exit(1);
}
if (strcmp(policy, "-") != 0) {
struct ipt_counters count;
if (counters) {
char *ctrs;
ctrs = strtok(NULL, " \t\n");
if (!ctrs || !parse_counters(ctrs, &count))
exit_error(PARAMETER_PROBLEM,
"invalid policy counters "
"for chain '%s'\n", chain);
} else {
memset(&count, 0,
sizeof(struct ipt_counters));
}
DEBUGP("Setting policy of chain %s to %s\n",
chain, policy);
if (!iptc_set_policy(chain, policy, &count,
&handle))
exit_error(OTHER_PROBLEM,
"Can't set policy `%s'"
" on `%s' line %u: %s\n",
chain, policy, line,
iptc_strerror(errno));
}
ret = 1;
} else if (in_table) {
int a;
char *ptr = buffer;
char *pcnt = NULL;
char *bcnt = NULL;
char *parsestart;
/* the parser */
char *param_start, *curchar;
int quote_open;
/* reset the newargv */
newargc = 0;
if (buffer[0] == '[') {
/* we have counters in our input */
ptr = strchr(buffer, ']');
if (!ptr)
exit_error(PARAMETER_PROBLEM,
"Bad line %u: need ]\n",
line);
pcnt = strtok(buffer+1, ":");
if (!pcnt)
exit_error(PARAMETER_PROBLEM,
"Bad line %u: need :\n",
line);
bcnt = strtok(NULL, "]");
if (!bcnt)
exit_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((char *) &curtable);
if (counters && pcnt && bcnt) {
add_argv("--set-counters");
add_argv((char *) pcnt);
add_argv((char *) bcnt);
}
/* 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 */
quote_open = 0;
param_start = parsestart;
for (curchar = parsestart; *curchar; curchar++) {
if (*curchar == '"') {
/* quote_open cannot be true if there
* was no previous character. Thus,
* curchar-1 has to be within bounds */
if (quote_open &&
*(curchar-1) != '\\') {
quote_open = 0;
*curchar = ' ';
} else {
quote_open = 1;
param_start++;
}
}
if (*curchar == ' '
|| *curchar == '\t'
|| * curchar == '\n') {
char param_buffer[1024];
int param_len = curchar-param_start;
if (quote_open)
continue;
if (!param_len) {
/* two spaces? */
param_start++;
continue;
}
/* end of one parameter */
strncpy(param_buffer, param_start,
param_len);
*(param_buffer+param_len) = '\0';
/* check if table name specified */
if (!strncmp(param_buffer, "-t", 3)
|| !strncmp(param_buffer, "--table", 8)) {
exit_error(PARAMETER_PROBLEM,
"Line %u seems to have a "
"-t table option.\n", line);
exit(1);
}
add_argv(param_buffer);
param_start += param_len + 1;
} else {
/* regular character, skip */
}
}
DEBUGP("calling do_command(%u, argv, &%s, handle):\n",
newargc, curtable);
for (a = 0; a < newargc; a++)
DEBUGP("argv[%u]: %s\n", a, newargv[a]);
ret = do_command(newargc, newargv,
&newargv[2], &handle);
free_argv();
}
if (!ret) {
fprintf(stderr, "%s: line %u failed\n",
program_name, line);
exit(1);
}
}
if (in_table) {
fprintf(stderr, "%s: COMMIT expected at line %u\n",
program_name, line + 1);
exit(1);
}
return 0;
}
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