iptables-1.3.2-20050720

[iptables.git] / extensions / libipt_childlevel.c

diff --git a/extensions/libipt_childlevel.c b/extensions/libipt_childlevel.c
new file mode 100644 (file)
index 0000000..1018c9e
--- /dev/null
+++ b/extensions/libipt_childlevel.c
@@ -0,0 +1,115 @@
+/* 
+   Shared library add-on to iptables to add layer 7 matching support. 
+
+   http://l7-filter.sf.net
+  
+   By Matthew Strait <quadong@users.sf.net>, Dec 2003.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version
+   2 of the License, or (at your option) any later version.
+   http://www.gnu.org/licenses/gpl.txt
+*/
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ctype.h>
+#include <dirent.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ipt_childlevel.h>
+
+/* Function which prints out usage message. */
+static void help(void)
+{
+       printf(
+       "CHILDLEVEL match v%s options:\n"
+       "--level <n>  : Match childlevel n (0 == master)\n",
+       IPTABLES_VERSION);
+       fputc('\n', stdout);
+}
+
+static struct option opts[] = {
+       { .name = "level", .has_arg = 1, .flag = 0, .val = '1' },
+       { .name = 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_childlevel_info *childlevelinfo = 
+               (struct ipt_childlevel_info *)(*match)->data;
+
+       switch (c) {
+       case '1':
+               check_inverse(optarg, &invert, &optind, 0);
+               childlevelinfo->childlevel = atoi(argv[optind-1]);
+               if (invert)
+                       childlevelinfo->invert = 1;
+               *flags = 1;
+               break;
+       default:
+               return 0;
+       }
+
+       return 1;
+}
+
+/* Final check; must have specified --level. */
+static void final_check(unsigned int flags)
+{
+       if (!flags)
+               exit_error(PARAMETER_PROBLEM,
+                          "CHILDLEVEL match: You must specify `--level'");
+}
+
+static void print_protocol(int n, int invert, int numeric)
+{
+       fputs("childlevel ", stdout);
+       if (invert) fputc('!', stdout);
+       printf("%d ", n);
+}
+
+/* Prints out the matchinfo. */
+static void print(const struct ipt_ip *ip,
+      const struct ipt_entry_match *match,
+      int numeric)
+{
+       printf("CHILDLEVEL ");
+
+       print_protocol(((struct ipt_childlevel_info *)match->data)->childlevel,
+                 ((struct ipt_childlevel_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)
+{
+        const struct ipt_childlevel_info *info =
+            (const struct ipt_childlevel_info*) match->data;
+
+        printf("--childlevel %s%d ", (info->invert) ? "! ": "", info->childlevel);
+}
+
+static struct iptables_match childlevel = { 
+       .name           = "childlevel",
+       .version        = IPTABLES_VERSION,
+       .size           = IPT_ALIGN(sizeof(struct ipt_childlevel_info)),
+       .userspacesize  = IPT_ALIGN(sizeof(struct ipt_childlevel_info)),
+       .help           = &help,
+       .parse          = &parse,
+       .final_check    = &final_check,
+       .print          = &print,
+       .save           = &save,
+       .extra_opts     = opts
+};
+
+void _init(void)
+{
+       register_match(&childlevel);
+}