blob: 415f1e4d35152401d118dd2c0c8d9adbbd2404f2 [file] [log] [blame]
/* 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>
*
*/
#include <getopt.h>
#include <sys/errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "ip6tables.h"
#include "libiptc/libip6tc.h"
#ifdef DEBUG
#define DEBUGP(x, args...) fprintf(stderr, x, ## args)
#else
#define DEBUGP(x, args...)
#endif
extern int for_each_chain(int (*fn)(const ip6t_chainlabel, int, ip6tc_handle_t *), int verbose, int builtinstoo, ip6tc_handle_t *handle);
extern int flush_entries(const ip6t_chainlabel chain, int verbose, ip6tc_handle_t *handle);
extern int delete_chain(const ip6t_chainlabel chain, int verbose, ip6tc_handle_t *handle);
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", 1, 0, 'v' }, */
{ "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] [-h]\n"
" [ --binary ]\n"
" [ --counters ]\n"
" [ --verbose ]\n"
" [ --help ]\n"
" [ --noflush ]\n"
" [ --modprobe=<command>]\n", name);
exit(1);
}
ip6tc_handle_t create_handle(const char *tablename, const char* modprobe)
{
ip6tc_handle_t handle;
handle = ip6tc_init(tablename);
if (!handle) {
/* try to insmod the module if iptc_init failed */
ip6tables_insmod("ip6_tables", modprobe);
handle = ip6tc_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 ip6t_counters *ctr)
{
return (sscanf(string, "[%llu:%llu]", &ctr->pcnt, &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) {
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]);
}
int main(int argc, char *argv[])
{
ip6tc_handle_t handle;
char buffer[10240];
unsigned int line = 0;
int c;
char curtable[IP6T_TABLE_MAXNAMELEN + 1];
FILE *in;
const char *modprobe = 0;
program_name = "ip6tables-restore";
program_version = NETFILTER_VERSION;
#ifdef NO_SHARED_LIBS
init_extensions();
#endif
while ((c = getopt_long(argc, argv, "bcvhnM:", options, NULL)) != -1) {
switch (c) {
case 'b':
binary = 1;
break;
case 'c':
counters = 1;
break;
case 'h':
print_usage("ip6tables-restore",
NETFILTER_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;
line++;
if (buffer[0] == '\n') continue;
else if (buffer[0] == '#') {
if (verbose) fputs(buffer, stdout);
continue;
} else if (strcmp(buffer, "COMMIT\n") == 0) {
DEBUGP("Calling commit\n");
ret = ip6tc_commit(&handle);
} else if (buffer[0] == '*') {
/* 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, IP6T_TABLE_MAXNAMELEN);
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;
} else if (buffer[0] == ':') {
/* 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 (!ip6tc_builtin(chain, handle)) {
DEBUGP("Creating new chain '%s'\n", curchain);
if (!ip6tc_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 ip6t_counters count;
if (counters) {
char *ctrs;
ctrs = strtok(NULL, " \t\n");
parse_counters(ctrs, &count);
} else {
memset(&count, 0,
sizeof(struct ip6t_counters));
}
DEBUGP("Setting policy of chain %s to %s\n",
chain, policy);
if (!ip6tc_set_policy(chain, policy, &count,
&handle))
exit_error(OTHER_PROBLEM,
"Can't set policy `%s'"
" on `%s' line %u: %s\n",
chain, policy, line,
ip6tc_strerror(errno));
}
ret = 1;
} else {
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);
/* IP6TABLES doesn't support this
if (counters && pcnt && bcnt) {
newargv[5] = "--set-counters";
newargv[6] = (char *) pcnt;
newargv[7] = (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 == '"') {
if (quote_open) {
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';
if (!strncmp(param_buffer, "-t", 3)) {
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_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);
free_argv();
}
if (!ret) {
fprintf(stderr, "%s: line %u failed\n",
program_name, line);
exit(1);
}
}
return 0;
}