iptables-1.3.2-20050720

[iptables.git] / extensions / libipt_SET.c

diff --git a/extensions/libipt_SET.c b/extensions/libipt_SET.c
new file mode 100644 (file)
index 0000000..d11a9f0
--- /dev/null
+++ b/extensions/libipt_SET.c
@@ -0,0 +1,180 @@
+/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
+ *                         Patrick Schaaf <bof@bof.de>
+ *                         Martin Josefsson <gandalf@wlug.westbo.se>
+ * Copyright (C) 2003-2004 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.  
+ */
+
+/* Shared library add-on to iptables to add IP set mangling target. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ctype.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_set.h>
+#include <linux/netfilter_ipv4/ipt_set.h>
+#include "libipt_set.h"
+
+/* Function which prints out usage message. */
+static void help(void)
+{
+       printf("SET v%s options:\n"
+              " --add-set name flags\n"
+              " --del-set name flags\n"
+              "                add/del src/dst IP/port from/to named sets,\n"
+              "                where flags are the comma separated list of\n"
+              "                'src' and 'dst'.\n"
+              "\n", IPTABLES_VERSION);
+}
+
+static struct option opts[] = {
+       {"add-set",   1, 0, '1'},
+       {"del-set",   1, 0, '2'},
+       {0}
+};
+
+/* Initialize the target. */
+static void init(struct ipt_entry_target *target, unsigned int *nfcache)
+{
+       struct ipt_set_info_target *info =
+           (struct ipt_set_info_target *) target->data;
+
+       memset(info, 0, sizeof(struct ipt_set_info_target));
+       info->add_set.index =
+       info->del_set.index = IP_SET_INVALID_ID;
+
+}
+
+static void
+parse_target(char **argv, int invert, unsigned int *flags,
+             struct ipt_set_info *info, const char *what)
+{
+       if (info->flags[0])
+               exit_error(PARAMETER_PROBLEM,
+                          "--%s can be specified only once", what);
+
+       if (check_inverse(optarg, &invert, NULL, 0))
+               exit_error(PARAMETER_PROBLEM,
+                          "Unexpected `!' after --%s", what);
+
+       if (!argv[optind]
+           || argv[optind][0] == '-' || argv[optind][0] == '!')
+               exit_error(PARAMETER_PROBLEM,
+                          "--%s requires two args.", what);
+
+       if (strlen(argv[optind-1]) > IP_SET_MAXNAMELEN - 1)
+               exit_error(PARAMETER_PROBLEM,
+                          "setname `%s' too long, max %d characters.",
+                          argv[optind-1], IP_SET_MAXNAMELEN - 1);
+
+       get_set_byname(argv[optind - 1], info);
+       parse_bindings(argv[optind], info);
+       optind++;
+       
+       *flags = 1;
+}
+
+/* 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, struct ipt_entry_target **target)
+{
+       struct ipt_set_info_target *myinfo =
+           (struct ipt_set_info_target *) (*target)->data;
+
+       switch (c) {
+       case '1':               /* --add-set <set> <flags> */
+               parse_target(argv, invert, flags,
+                            &myinfo->add_set, "add-set");
+               break;
+       case '2':               /* --del-set <set>[:<flags>] <flags> */
+               parse_target(argv, invert, flags,
+                            &myinfo->del_set, "del-set");
+               break;
+
+       default:
+               return 0;
+       }
+       return 1;
+}
+
+/* Final check; must specify at least one. */
+static void final_check(unsigned int flags)
+{
+       if (!flags)
+               exit_error(PARAMETER_PROBLEM,
+                          "You must specify either `--add-set' or `--del-set'");
+}
+
+static void
+print_target(const char *prefix, const struct ipt_set_info *info)
+{
+       int i;
+       char setname[IP_SET_MAXNAMELEN];
+
+       if (info->index == IP_SET_INVALID_ID)
+               return;
+       get_set_byid(setname, info->index);
+       printf("%s %s", prefix, setname);
+       for (i = 0; i < IP_SET_MAX_BINDINGS; i++) {
+               if (!info->flags[i])
+                       break;          
+               printf("%s%s",
+                      i == 0 ? " " : ",",
+                      info->flags[i] & IPSET_SRC ? "src" : "dst");
+       }
+       printf(" ");
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target, int numeric)
+{
+       struct ipt_set_info_target *info =
+           (struct ipt_set_info_target *) target->data;
+
+       print_target("add-set", &info->add_set);
+       print_target("del-set", &info->del_set);
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+       struct ipt_set_info_target *info =
+           (struct ipt_set_info_target *) target->data;
+
+       print_target("--add-set", &info->add_set);
+       print_target("--del-set", &info->del_set);
+}
+
+static
+struct iptables_target ipt_set_target 
+= {
+       .name           = "SET",
+       .version        = IPTABLES_VERSION,
+       .size           = IPT_ALIGN(sizeof(struct ipt_set_info_target)),
+       .userspacesize  = IPT_ALIGN(sizeof(struct ipt_set_info_target)),
+       .help           = &help,
+       .init           = &init,
+       .parse          = &parse,
+       .final_check    = &final_check,
+       .print          = &print,
+       .save           = &save,
+       .extra_opts     = opts
+};
+
+void _init(void)
+{
+       register_target(&ipt_set_target);
+}