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authorlaforge <laforge>2001-07-30 13:30:14 +0000
committerlaforge <laforge>2001-07-30 13:30:14 +0000
commiteec407cc981fac8fb481c5d5aee6ee85c996886d (patch)
tree3aa8d75e82e178ac06af2c087e1fdae1fa6fcde3 /extensions
parent9a11770d645c313697cd3953f81aacc9b80990d6 (diff)
added realm match from Sampsa Ranta
Diffstat (limited to 'extensions')
-rwxr-xr-xextensions/.realm-test3
-rw-r--r--extensions/libipt_realm.c136
2 files changed, 139 insertions, 0 deletions
diff --git a/extensions/.realm-test b/extensions/.realm-test
new file mode 100755
index 0000000..9eae97d
--- /dev/null
+++ b/extensions/.realm-test
@@ -0,0 +1,3 @@
+#!/bin/sh
+# True if nth is applied.
+[ -f $KERNEL_DIR/include/linux/netfilter_ipv4/ipt_realm.h ] && echo realm
diff --git a/extensions/libipt_realm.c b/extensions/libipt_realm.c
new file mode 100644
index 0000000..54bcb9a
--- /dev/null
+++ b/extensions/libipt_realm.c
@@ -0,0 +1,136 @@
+/* Shared library add-on to iptables to add MAC address 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", NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+ { "realm", 1, 0, '1' },
+ {0}
+};
+
+/* Initialize the match. */
+static void
+init(struct ipt_entry_match *m, unsigned int *nfcache)
+{
+ /* Can't cache this */
+ *nfcache |= NFC_UNKNOWN;
+}
+
+/* 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':
+ if (check_inverse(optarg, &invert))
+ optind++;
+ 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, int invert, int numeric)
+{
+ if (invert)
+ fputc('!', stdout);
+
+ 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)
+{
+ printf("REALM match ");
+ print_realm(((struct ipt_realm_info *)match->data)->id,
+ ((struct ipt_realm_info *)match->data)->mask,
+ ((struct ipt_realm_info *)match->data)->invert, numeric);
+}
+
+
+/* Saves the union ipt_matchinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
+{
+ printf("--realm ");
+ print_realm(((struct ipt_realm_info *)match->data)->id,
+ ((struct ipt_realm_info *)match->data)->mask,
+ ((struct ipt_realm_info *)match->data)->invert, 0);
+}
+
+/* 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'");
+}
+
+struct iptables_match realm
+= { NULL,
+ "realm",
+ NETFILTER_VERSION,
+ IPT_ALIGN(sizeof(struct ipt_realm_info)),
+ IPT_ALIGN(sizeof(struct ipt_realm_info)),
+ &help,
+ &init,
+ &parse,
+ &final_check,
+ &print,
+ &save,
+ opts
+};
+
+void _init(void)
+{
+ register_match(&realm);
+}
+
+