From a733daccce972d7d8ca3701b810032abc4a6daea Mon Sep 17 00:00:00 2001
From: rusty <rusty>
Date: Sun, 27 Aug 2000 07:47:46 +0000
Subject: Patch-o-matic! now included.

---
 extensions/libipt_pool.c | 143 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 extensions/libipt_pool.c

(limited to 'extensions/libipt_pool.c')

diff --git a/extensions/libipt_pool.c b/extensions/libipt_pool.c
new file mode 100644
index 0000000..23e2922
--- /dev/null
+++ b/extensions/libipt_pool.c
@@ -0,0 +1,143 @@
+/* Shared library add-on to iptables to add IP address pool matching. */
+#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_conntrack.h>
+#include <linux/netfilter_ipv4/ipt_pool.h>
+
+#include <libippool/ip_pool_support.h>
+
+/* FIXME --RR */
+#include "../ippool/libippool.c"
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+	printf(
+"pool v%s options:\n"
+" [!] --srcpool NAME|INDEX\n"
+" [!] --dstpool NAME|INDEX\n"
+"			Pool index (or name from %s) to match\n"
+"\n", NETFILTER_VERSION, IPPOOL_CONF);
+}
+
+static struct option opts[] = {
+	{ "srcpool", 1, 0, '1' },
+	{ "dstpool", 1, 0, '2' },
+	{0}
+};
+
+/* Initialize the match. */
+static void
+init(struct ipt_entry_match *match, unsigned int *nfcache)
+{
+	struct ipt_pool_info *info =
+		(struct ipt_pool_info *)match->data;
+
+	info->src = IP_POOL_NONE;
+	info->dst = IP_POOL_NONE;
+	info->flags = 0;
+	/* Can't cache this - XXX */
+	*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_pool_info *info =
+		(struct ipt_pool_info *)(*match)->data;
+
+	switch (c) {
+	case '1':
+		if (check_inverse(optarg, &invert)) optind++;
+		info->src = ip_pool_get_index(argv[optind-1]);
+		if (invert) info->flags |= IPT_POOL_INV_SRC;
+		*flags = 1;
+		break;
+	case '2':
+		if (check_inverse(optarg, &invert)) optind++;
+		info->dst = ip_pool_get_index(argv[optind-1]);
+		if (invert) info->flags |= IPT_POOL_INV_DST;
+		*flags = 1;
+		break;
+
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+/* Final check; must have specified --srcpool or --dstpool. */
+static void final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM, "You must specify either `--srcpool or --dstpool'");
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_match *match,
+      int numeric)
+{
+	char buf[256];
+	struct ipt_pool_info *info =
+		(struct ipt_pool_info *)match->data;
+
+	if (info->src != IP_POOL_NONE)
+		printf("%ssrcpool %s ",
+			(info->flags & IPT_POOL_INV_SRC) ? "!" : "",
+			ip_pool_get_name(buf, sizeof(buf), info->src, 0));
+	if (info->dst != IP_POOL_NONE)
+		printf("%sdstpool %s ",
+			(info->flags & IPT_POOL_INV_DST) ? "!" : "",
+			ip_pool_get_name(buf, sizeof(buf), info->dst, 0));
+}
+
+/* Saves the matchinfo in parsable form to stdout. */
+static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
+{
+	char buf[256];
+	struct ipt_pool_info *info =
+		(struct ipt_pool_info *)match->data;
+
+	if (info->src != IP_POOL_NONE)
+		printf("%s--srcpool %s",
+			(info->flags & IPT_POOL_INV_SRC) ? "! " : "",
+			ip_pool_get_name(buf, sizeof(buf), info->src, 0));
+	if (info->dst != IP_POOL_NONE)
+		printf("%s--dstpool %s",
+			(info->flags & IPT_POOL_INV_DST) ? "! " : "",
+			ip_pool_get_name(buf, sizeof(buf), info->dst, 0));
+}
+
+struct iptables_match pool
+= { NULL,
+    "pool",
+    NETFILTER_VERSION,
+    IPT_ALIGN(sizeof(struct ipt_pool_info)),
+    IPT_ALIGN(sizeof(struct ipt_pool_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+	register_match(&pool);
+}
-- 
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