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-rw-r--r--extensions/libipt_childlevel.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/extensions/libipt_childlevel.c b/extensions/libipt_childlevel.c
new file mode 100644
index 0000000..bc9f0ad
--- /dev/null
+++ b/extensions/libipt_childlevel.c
@@ -0,0 +1,122 @@
+/*
+ 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 }
+};
+
+/* Initialize the match. */
+static void init(struct ipt_entry_match *m, unsigned int *nfcache)
+{
+ *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_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,
+ .init = &init,
+ .parse = &parse,
+ .final_check = &final_check,
+ .print = &print,
+ .save = &save,
+ .extra_opts = opts
+};
+
+void _init(void)
+{
+ register_match(&childlevel);
+}