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path: root/polux/application/iptables/extensions/libipt_realm.c
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Diffstat (limited to 'polux/application/iptables/extensions/libipt_realm.c')
-rw-r--r--polux/application/iptables/extensions/libipt_realm.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/polux/application/iptables/extensions/libipt_realm.c b/polux/application/iptables/extensions/libipt_realm.c
new file mode 100644
index 0000000000..90e6089709
--- /dev/null
+++ b/polux/application/iptables/extensions/libipt_realm.c
@@ -0,0 +1,129 @@
+/* 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);
+}
+
+