From 5c306289b8a78a060a12eba5cd86e0efc3533da0 Mon Sep 17 00:00:00 2001
From: marc <marc>
Date: Mon, 20 Mar 2000 06:03:29 +0000
Subject: reorganized tree after kernel merge

---
 extensions/libipt_REJECT.c | 159 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 extensions/libipt_REJECT.c

(limited to 'extensions/libipt_REJECT.c')

diff --git a/extensions/libipt_REJECT.c b/extensions/libipt_REJECT.c
new file mode 100644
index 0000000..e336587
--- /dev/null
+++ b/extensions/libipt_REJECT.c
@@ -0,0 +1,159 @@
+/* Shared library add-on to iptables to add customized REJECT support.
+ *
+ * (C) 2000 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_REJECT.h>
+
+struct reject_names {
+	const char *name;
+	const char *alias;
+	enum ipt_reject_with with;
+	const char *desc;
+};
+
+static const struct reject_names reject_table[] = {
+	{"icmp-net-unreachable", "net-unreach", 
+		IPT_ICMP_NET_UNREACHABLE, "ICMP network unreachable"},
+	{"icmp-host-unreachable", "host-unreach",
+		IPT_ICMP_HOST_UNREACHABLE, "ICMP host unreachable"},
+	{"icmp-port-unreachable", "port-unreach",
+		IPT_ICMP_PORT_UNREACHABLE, "ICMP port unreachable (default)"},
+	{"icmp-proto-unreachable", "proto-unreach",
+		IPT_ICMP_PROT_UNREACHABLE, "ICMP protocol unreachable"},
+	{"tcp-reset", "rst", 
+		IPT_TCP_RESET, "for TCP only: faked TCP RST"},
+	{"echo-reply", "echoreply",
+		IPT_ICMP_ECHOREPLY, "for ICMP echo only: faked ICMP echo reply"},
+};
+
+static void 
+print_reject_types()
+{
+	unsigned int i;
+	
+	printf("Valid reject types:\n");
+
+	for (i = 0; i < sizeof(reject_table)/sizeof(struct reject_names); i++) {
+		printf("    %-25s\t%s\n", reject_table[i].name, reject_table[i].desc);
+		printf("    %-25s\talias\n", reject_table[i].alias);
+	}
+	printf("\n");
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+
+/* Function which prints out usage message. */
+static void 
+help(void)
+{
+	printf(
+"REJECT options:\n"
+"--reject-with type              drop input packet and send back\n"
+"                                a reply packet according to type:\n");
+
+	print_reject_types();
+}
+
+static struct option opts[] = {
+	{ "reject-with", 1, 0, '1' },
+	{ 0 }
+};
+
+/* Allocate and initialize the target. */
+static void
+init(struct ipt_entry_target *t, unsigned int *nfcache)
+{
+	struct ipt_reject_info *reject = (struct ipt_reject_info *)t->data;
+	
+	/* default */
+	reject->with = IPT_ICMP_PORT_UNREACHABLE;
+	
+	/* Can't cache this */
+	*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,
+      struct ipt_entry_target **target)
+{	
+	struct ipt_reject_info *reject = (struct ipt_reject_info *)(*target)->data;
+	unsigned int limit = sizeof(reject_table)/sizeof(struct reject_names);
+	unsigned int i;
+		
+	switch(c) {
+	case '1':
+		if (check_inverse(optarg, &invert))
+			exit_error(PARAMETER_PROBLEM, 
+				   "Unexpected `!' after --reject-with");
+		for (i = 0; i < limit; i++) {
+			if ((strncasecmp(reject_table[i].name, optarg, strlen(optarg)) == 0)
+			    || (strncasecmp(reject_table[i].alias, optarg, strlen(optarg)) == 0)) {
+				reject->with = reject_table[i].with;
+				return 1;
+			}
+		}
+		exit_error(PARAMETER_PROBLEM, "unknown reject type `%s'",optarg);
+	default:
+		/* Fall through */
+	}
+	return 0;
+}	
+
+/* Final check; nothing. */
+static void final_check(unsigned int flags)
+{
+}
+
+/* Prints out ipt_reject_info. */
+static void 
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target, 
+      int numeric)
+{
+	const struct ipt_reject_info *reject 
+		= (const struct ipt_reject_info *)target->data;
+	unsigned int i;
+	
+	for (i = 0; i < sizeof(reject_table)/sizeof(struct reject_names); i++) {
+		if (reject_table[i].with == reject->with)
+			break;
+	}
+	printf("reject-with %s ", reject_table[i].name);
+}
+
+/* Saves ipt_reject in parsable form to stdout. */
+static void save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+	const struct ipt_reject_info *reject 
+		= (const struct ipt_reject_info *)target->data;
+	
+	printf("--reject-with %s ", reject_table[reject->with].name);
+}
+
+struct iptables_target reject
+= { NULL,
+    "REJECT",
+    NETFILTER_VERSION,
+    sizeof(struct ipt_reject_info),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+	register_target(&reject);
+}
-- 
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