Merge commit 'origin/trunk@12184' into fedora

[iptables.git] / trunk / extensions / libxt_helper.c

diff --git a/trunk/extensions/libxt_helper.c b/trunk/extensions/libxt_helper.c
new file mode 100644 (file)
index 0000000..ba0b996
--- /dev/null
+++ b/trunk/extensions/libxt_helper.c
@@ -0,0 +1,107 @@
+/* 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 helper_help(void)
+{
+       printf(
+"helper match options:\n"
+"[!] --helper string        Match helper identified by string\n");
+}
+
+static const struct option helper_opts[] = {
+       { "helper", 1, NULL, '1' },
+       { .name = NULL }
+};
+
+/* Function which parses command options; returns true if it
+   ate an option */
+static int
+helper_parse(int c, char **argv, int invert, unsigned int *flags,
+             const void *entry, 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 helper_check(unsigned int flags)
+{
+       if (!flags)
+               exit_error(PARAMETER_PROBLEM,
+                          "helper match: You must specify `--helper'");
+}
+
+/* Prints out the info. */
+static void
+helper_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 helper_save(const void *ip, const struct xt_entry_match *match)
+{
+       struct xt_helper_info *info = (struct xt_helper_info *)match->data;
+
+       printf("%s--helper ",info->invert ? "! " : "");
+       save_string(info->name);
+}
+
+static struct xtables_match helper_match = {
+       .family         = AF_INET,
+       .name           = "helper",
+       .version        = XTABLES_VERSION,
+       .size           = XT_ALIGN(sizeof(struct xt_helper_info)),
+       .help           = helper_help,
+       .parse          = helper_parse,
+       .final_check    = helper_check,
+       .print          = helper_print,
+       .save           = helper_save,
+       .extra_opts     = helper_opts,
+};
+
+static struct xtables_match helper_match6 = {
+       .family         = AF_INET6,
+       .name           = "helper",
+       .version        = XTABLES_VERSION,
+       .size           = XT_ALIGN(sizeof(struct xt_helper_info)),
+       .help           = helper_help,
+       .parse          = helper_parse,
+       .final_check    = helper_check,
+       .print          = helper_print,
+       .save           = helper_save,
+       .extra_opts     = helper_opts,
+};
+
+void _init(void)
+{
+       xtables_register_match(&helper_match);
+       xtables_register_match(&helper_match6);
+}