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/* Shared library add-on to iptables to add realm matching support. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#if defined(__GLIBC__) && __GLIBC__ == 2
#include <net/ethernet.h>
#else
#include <linux/if_ether.h>
#endif
#include <iptables.h>
#include <linux/netfilter_ipv4/ipt_realm.h>
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"REALM v%s options:\n"
" --realm [!] value[/mask]\n"
" Match realm\n"
"\n", IPTABLES_VERSION);
}
static struct option opts[] = {
{ "realm", 1, 0, '1' },
{0}
};
/* Function which parses command options; returns true if it
ate an option */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const struct ipt_entry *entry,
unsigned int *nfcache,
struct ipt_entry_match **match)
{
struct ipt_realm_info *realminfo = (struct ipt_realm_info *)(*match)->data;
switch (c) {
char *end;
case '1':
check_inverse(argv[optind-1], &invert, &optind, 0);
optarg = argv[optind-1];
realminfo->id = strtoul(optarg, &end, 0);
if (*end == '/') {
realminfo->mask = strtoul(end+1, &end, 0);
} else
realminfo->mask = 0xffffffff;
if (*end != '\0' || end == optarg)
exit_error(PARAMETER_PROBLEM, "Bad REALM value `%s'", optarg);
if (invert)
realminfo->invert = 1;
*flags = 1;
break;
default:
return 0;
}
return 1;
}
static void
print_realm(unsigned long id, unsigned long mask)
{
if (mask != 0xffffffff)
printf("0x%lx/0x%lx ", id, mask);
else
printf("0x%lx ", id);
}
/* Prints out the matchinfo. */
static void
print(const struct ipt_ip *ip,
const struct ipt_entry_match *match,
int numeric)
{
struct ipt_realm_info *ri = (struct ipt_realm_info *) match->data;
if (ri->invert)
printf("! ");
printf("REALM match ");
print_realm(ri->id, ri->mask);
}
/* Saves the union ipt_matchinfo in parsable form to stdout. */
static void
save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
{
struct ipt_realm_info *ri = (struct ipt_realm_info *) match->data;
if (ri->invert)
printf("! ");
printf("--realm ");
print_realm(ri->id, ri->mask);
}
/* Final check; must have specified --mark. */
static void
final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"REALM match: You must specify `--realm'");
}
static struct iptables_match realm = { NULL,
.name = "realm",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_realm_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_realm_info)),
.help = &help,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_match(&realm);
}
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