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/*
* ebtables-restore.c, October 2005
*
* Author: Bart De Schuymer
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <getopt.h>
#include "include/ebtables_u.h"
static const struct option options[] = {
{.name = "noflush", .has_arg = 0, .val = 'n'},
{ 0 }
};
static struct ebt_u_replace replace[3];
void ebt_early_init_once();
#define OPT_KERNELDATA 0x800 /* Also defined in ebtables.c */
static void print_usage()
{
fprintf(stderr, "Usage: ebtables-restore [ --noflush ]\n");
exit(1);
}
static void copy_table_names()
{
strcpy(replace[0].name, "filter");
strcpy(replace[1].name, "nat");
strcpy(replace[2].name, "broute");
}
#define ebtrest_print_error(format, args...) do {fprintf(stderr, "ebtables-restore: "\
"line %d: "format".\n", line, ##args); exit(-1);} while (0)
int main(int argc_, char *argv_[])
{
char *argv[EBTD_ARGC_MAX], cmdline[EBTD_CMDLINE_MAXLN];
int i, offset, quotemode = 0, argc, table_nr = -1, line = 0, whitespace, c, flush = 1;
char ebtables_str[] = "ebtables";
while ((c = getopt_long(argc_, argv_, "n", options, NULL)) != -1) {
switch(c) {
case 'n':
flush = 0;
break;
default:
print_usage();
break;
}
}
ebt_silent = 0;
copy_table_names();
ebt_early_init_once();
argv[0] = ebtables_str;
while (fgets(cmdline, EBTD_CMDLINE_MAXLN, stdin)) {
line++;
if (*cmdline == '#' || *cmdline == '\n')
continue;
*strchr(cmdline, '\n') = '\0';
if (*cmdline == '*') {
if (table_nr != -1) {
ebt_deliver_table(&replace[table_nr]);
ebt_deliver_counters(&replace[table_nr]);
}
for (i = 0; i < 3; i++)
if (!strcmp(replace[i].name, cmdline+1))
break;
if (i == 3)
ebtrest_print_error("table '%s' was not recognized", cmdline+1);
table_nr = i;
replace[table_nr].command = 11;
ebt_get_kernel_table(&replace[table_nr], flush);
replace[table_nr].command = 0;
replace[table_nr].flags = OPT_KERNELDATA; /* Prevent do_command from initialising replace */
continue;
} else if (table_nr == -1)
ebtrest_print_error("no table specified");
if (*cmdline == ':') {
int policy, chain_nr;
char *ch;
if (!(ch = strchr(cmdline, ' ')))
ebtrest_print_error("no policy specified");
*ch = '\0';
for (i = 0; i < NUM_STANDARD_TARGETS; i++)
if (!strcmp(ch+1, ebt_standard_targets[i])) {
policy = -i -1;
if (policy == EBT_CONTINUE)
i = NUM_STANDARD_TARGETS;
break;
}
if (i == NUM_STANDARD_TARGETS)
ebtrest_print_error("invalid policy specified");
/* No need to check chain name for consistency, since
* we're supposed to be reading an automatically generated
* file. */
if ((chain_nr = ebt_get_chainnr(&replace[table_nr], cmdline+1)) == -1)
ebt_new_chain(&replace[table_nr], cmdline+1, policy);
else
replace[table_nr].chains[chain_nr]->policy = policy;
continue;
}
argv[1] = cmdline;
offset = whitespace = 0;
argc = 2;
while (cmdline[offset] != '\0') {
if (cmdline[offset] == '\"') {
whitespace = 0;
quotemode ^= 1;
if (quotemode)
argv[argc++] = &cmdline[offset+1];
else if (cmdline[offset+1] != ' ' && cmdline[offset+1] != '\0')
ebtrest_print_error("syntax error at \"");
cmdline[offset] = '\0';
} else if (!quotemode && cmdline[offset] == ' ') {
whitespace = 1;
cmdline[offset] = '\0';
} else if (whitespace == 1) {
argv[argc++] = &cmdline[offset];
whitespace = 0;
}
offset++;
}
if (quotemode)
ebtrest_print_error("wrong use of '\"'");
optind = 0; /* Setting optind = 1 causes serious annoyances */
do_command(argc, argv, EXEC_STYLE_DAEMON, &replace[table_nr]);
ebt_reinit_extensions();
}
if (table_nr != -1) {
ebt_deliver_table(&replace[table_nr]);
ebt_deliver_counters(&replace[table_nr]);
}
return 0;
}
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