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authorYasuyuki KOZAKAI <yasuyuki@netfilter.org>2007-08-04 08:26:59 +0000
committerYasuyuki KOZAKAI <yasuyuki@netfilter.org>2007-08-04 08:26:59 +0000
commitf8137b1b4cc18d4ff528ac40b83345260bb644ae (patch)
tree886b69b0a9c28ad4acf84aea5024982ff7519359 /extensions/libxt_helper.c
parent6aac50010e50aa42b42089110c8cf4d80b224f14 (diff)
Add IPv6 support to helper match
Diffstat (limited to 'extensions/libxt_helper.c')
-rw-r--r--extensions/libxt_helper.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/extensions/libxt_helper.c b/extensions/libxt_helper.c
new file mode 100644
index 00000000..ca3cb21f
--- /dev/null
+++ b/extensions/libxt_helper.c
@@ -0,0 +1,115 @@
+/* Shared library add-on to iptables to add related packet matching support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <xtables.h>
+#include <linux/netfilter/xt_helper.h>
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+ printf(
+"helper match v%s options:\n"
+"[!] --helper string Match helper identified by string\n"
+"\n",
+IPTABLES_VERSION);
+}
+
+static const struct option opts[] = {
+ { "helper", 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 void *entry,
+ unsigned int *nfcache,
+ struct xt_entry_match **match)
+{
+ struct xt_helper_info *info = (struct xt_helper_info *)(*match)->data;
+
+ switch (c) {
+ case '1':
+ if (*flags)
+ exit_error(PARAMETER_PROBLEM,
+ "helper match: Only use --helper ONCE!");
+ check_inverse(optarg, &invert, &invert, 0);
+ strncpy(info->name, optarg, 29);
+ info->name[29] = '\0';
+ if (invert)
+ info->invert = 1;
+ *flags = 1;
+ break;
+
+ default:
+ return 0;
+ }
+ return 1;
+}
+
+/* Final check; must have specified --helper. */
+static void
+final_check(unsigned int flags)
+{
+ if (!flags)
+ exit_error(PARAMETER_PROBLEM,
+ "helper match: You must specify `--helper'");
+}
+
+/* Prints out the info. */
+static void
+print(const void *ip,
+ const struct xt_entry_match *match,
+ int numeric)
+{
+ struct xt_helper_info *info = (struct xt_helper_info *)match->data;
+
+ printf("helper match %s\"%s\" ", info->invert ? "! " : "", info->name);
+}
+
+/* Saves the union ipt_info in parsable form to stdout. */
+static void
+save(const void *ip, const struct xt_entry_match *match)
+{
+ struct xt_helper_info *info = (struct xt_helper_info *)match->data;
+
+ printf("%s--helper \"%s\" ",info->invert ? "! " : "", info->name);
+}
+
+static struct xtables_match helper = {
+ .family = AF_INET,
+ .name = "helper",
+ .version = IPTABLES_VERSION,
+ .size = XT_ALIGN(sizeof(struct xt_helper_info)),
+ .help = &help,
+ .parse = &parse,
+ .final_check = &final_check,
+ .print = &print,
+ .save = &save,
+ .extra_opts = opts,
+};
+
+static struct xtables_match helper6 = {
+ .family = AF_INET6,
+ .name = "helper",
+ .version = IPTABLES_VERSION,
+ .size = XT_ALIGN(sizeof(struct xt_helper_info)),
+ .help = &help,
+ .parse = &parse,
+ .final_check = &final_check,
+ .print = &print,
+ .save = &save,
+ .extra_opts = opts,
+};
+
+void _init(void)
+{
+ xtables_register_match(&helper);
+ xtables_register_match(&helper6);
+}