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/* Shared library add-on to iptables to add IP range matching support. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ipt_iprange.h>
/* Function which prints out usage message. */
static void iprange_help(void)
{
printf(
"iprange match v%s options:\n"
"[!] --src-range ip-ip Match source IP in the specified range\n"
"[!] --dst-range ip-ip Match destination IP in the specified range\n"
"\n",
IPTABLES_VERSION);
}
static const struct option iprange_opts[] = {
{ "src-range", 1, NULL, '1' },
{ "dst-range", 1, NULL, '2' },
{ }
};
static void
parse_iprange(char *arg, struct ipt_iprange *range)
{
char *dash;
struct in_addr *ip;
dash = strchr(arg, '-');
if (dash)
*dash = '\0';
ip = dotted_to_addr(arg);
if (!ip)
exit_error(PARAMETER_PROBLEM, "iprange match: Bad IP address `%s'\n",
arg);
range->min_ip = ip->s_addr;
if (dash) {
ip = dotted_to_addr(dash+1);
if (!ip)
exit_error(PARAMETER_PROBLEM, "iprange match: Bad IP address `%s'\n",
dash+1);
range->max_ip = ip->s_addr;
} else
range->max_ip = range->min_ip;
}
/* Function which parses command options; returns true if it
ate an option */
static int iprange_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct ipt_iprange_info *info = (struct ipt_iprange_info *)(*match)->data;
switch (c) {
case '1':
if (*flags & IPRANGE_SRC)
exit_error(PARAMETER_PROBLEM,
"iprange match: Only use --src-range ONCE!");
*flags |= IPRANGE_SRC;
info->flags |= IPRANGE_SRC;
check_inverse(optarg, &invert, &optind, 0);
if (invert) {
info->flags |= IPRANGE_SRC_INV;
}
parse_iprange(optarg, &info->src);
break;
case '2':
if (*flags & IPRANGE_DST)
exit_error(PARAMETER_PROBLEM,
"iprange match: Only use --dst-range ONCE!");
*flags |= IPRANGE_DST;
info->flags |= IPRANGE_DST;
check_inverse(optarg, &invert, &optind, 0);
if (invert)
info->flags |= IPRANGE_DST_INV;
parse_iprange(optarg, &info->dst);
break;
default:
return 0;
}
return 1;
}
/* Final check; must have specified --src-range or --dst-range. */
static void iprange_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"iprange match: You must specify `--src-range' or `--dst-range'");
}
static void
print_iprange(const struct ipt_iprange *range)
{
const unsigned char *byte_min, *byte_max;
byte_min = (const unsigned char *) &(range->min_ip);
byte_max = (const unsigned char *) &(range->max_ip);
printf("%d.%d.%d.%d-%d.%d.%d.%d ",
byte_min[0], byte_min[1], byte_min[2], byte_min[3],
byte_max[0], byte_max[1], byte_max[2], byte_max[3]);
}
/* Prints out the info. */
static void iprange_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
struct ipt_iprange_info *info = (struct ipt_iprange_info *)match->data;
if (info->flags & IPRANGE_SRC) {
printf("source IP range ");
if (info->flags & IPRANGE_SRC_INV)
printf("! ");
print_iprange(&info->src);
}
if (info->flags & IPRANGE_DST) {
printf("destination IP range ");
if (info->flags & IPRANGE_DST_INV)
printf("! ");
print_iprange(&info->dst);
}
}
/* Saves the union ipt_info in parsable form to stdout. */
static void iprange_save(const void *ip, const struct xt_entry_match *match)
{
struct ipt_iprange_info *info = (struct ipt_iprange_info *)match->data;
if (info->flags & IPRANGE_SRC) {
if (info->flags & IPRANGE_SRC_INV)
printf("! ");
printf("--src-range ");
print_iprange(&info->src);
if (info->flags & IPRANGE_DST)
fputc(' ', stdout);
}
if (info->flags & IPRANGE_DST) {
if (info->flags & IPRANGE_DST_INV)
printf("! ");
printf("--dst-range ");
print_iprange(&info->dst);
}
}
static struct iptables_match iprange_match = {
.name = "iprange",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_iprange_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_iprange_info)),
.help = iprange_help,
.parse = iprange_parse,
.final_check = iprange_check,
.print = iprange_print,
.save = iprange_save,
.extra_opts = iprange_opts,
};
void _init(void)
{
register_match(&iprange_match);
}
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