add fuzzy support (Hime Junior)

2 files changed, 159 insertions, 0 deletions

diff --git a/extensions/.fuzzy-test b/extensions/.fuzzy-test
new file mode 100755
index 00000000..f6575a99
--- /dev/null
+++ b/extensions/.fuzzy-test
@@ -0,0 +1,2 @@
+#! /bin/sh
+[ -f $KERNEL_DIR/include/linux/netfilter_ipv4/ipt_fuzzy.h ] && echo fuzzy 
diff --git a/extensions/libipt_fuzzy.c b/extensions/libipt_fuzzy.c
new file mode 100644
index 00000000..745d159c
--- /dev/null
+++ b/extensions/libipt_fuzzy.c
@@ -0,0 +1,157 @@
+/* 
+   Shared library add-on to iptables to add match support for the fuzzy match.
+   
+   This file is distributed under the terms of the GNU General Public
+   License (GPL). Copies of the GPL can be obtained from:
+   ftp://prep.ai.mit.edu/pub/gnu/GPL
+
+2002-08-07 Hime Aguiar e Oliveira Jr. <hime@engineer.com> : Initial version.
+
+*/
+
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <getopt.h>
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_fuzzy.h>
+
+
+static void
+help(void)
+{
+	printf(
+"fuzzy v%s options:\n"
+"                      --lower-limit number (in packets per second)\n"
+"                      --upper-limit number\n"
+,IPTABLES_VERSION);
+};
+
+static struct option opts[] = {
+	{ "lower-limit", 1 , 0 , '1' } ,
+	{ "upper-limit", 1 , 0 , '2' } ,
+	{ 0 }
+};
+
+/* Initialize data structures */
+static void
+init(struct ipt_entry_match *m, unsigned int *nfcache)
+{
+	struct ipt_fuzzy_info *presentinfo = (struct ipt_fuzzy_info *)(m)->data;
+	*nfcache |= NFC_UNKNOWN;
+
+	/*
+	 * Default rates ( I'll improve this very soon with something based 
+	 * on real statistics of the running machine ) .
+	*/
+
+	presentinfo->minimum_rate = 1000;
+	presentinfo->maximum_rate = 2000;
+}
+
+#define IPT_FUZZY_OPT_MINIMUM	0x01
+#define IPT_FUZZY_OPT_MAXIMUM	0x02
+
+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_fuzzy_info *fuzzyinfo = (struct ipt_fuzzy_info *)(*match)->data;
+
+	u_int32_t num;
+
+	switch (c) {
+
+	case '1':
+		
+	if (invert)
+	       	exit_error(PARAMETER_PROBLEM,"Can't specify ! --lower-limit");
+
+	if (*flags & IPT_FUZZY_OPT_MINIMUM)
+       	      exit_error(PARAMETER_PROBLEM,"Can't specify --lower-limit twice");
+	
+	if (string_to_number(optarg,1,MAXFUZZYRATE,&num) == -1 || num < 1)
+			exit_error(PARAMETER_PROBLEM,"BAD --lower-limit");
+
+		fuzzyinfo->minimum_rate = num ;
+
+		*flags |= IPT_FUZZY_OPT_MINIMUM;
+		
+		break;
+
+	case '2':
+
+	if (invert)
+		exit_error(PARAMETER_PROBLEM,"Can't specify ! --upper-limit");
+
+	if (*flags & IPT_FUZZY_OPT_MAXIMUM)
+	   exit_error(PARAMETER_PROBLEM,"Can't specify --upper-limit twice");
+
+	if (string_to_number(optarg,1,MAXFUZZYRATE,&num) == -1 || num < 1)
+		exit_error(PARAMETER_PROBLEM,"BAD --upper-limit");
+
+		fuzzyinfo->maximum_rate = num ;
+
+		*flags |= IPT_FUZZY_OPT_MAXIMUM;
+
+		break ;
+
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static void final_check(unsigned int flags)
+{
+}
+
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_match *match,
+      int numeric)
+{
+	const struct ipt_fuzzy_info *fuzzyinfo
+		= (const struct ipt_fuzzy_info *)match->data;
+
+	printf(" fuzzy: lower limit = %u pps - upper limit = %u pps ",fuzzyinfo->minimum_rate,fuzzyinfo->maximum_rate);
+
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
+{
+	const struct ipt_fuzzy_info *fuzzyinfo
+		= (const struct ipt_fuzzy_info *)match->data;
+
+	printf("--upper-limit %u ",fuzzyinfo->minimum_rate);
+	printf("--lower-limit %u ",fuzzyinfo->maximum_rate);
+
+}
+
+struct iptables_match fuzzy_match
+= { NULL,
+    "fuzzy",
+    IPTABLES_VERSION,
+    IPT_ALIGN(sizeof(struct ipt_fuzzy_info)),
+    IPT_ALIGN(sizeof(struct ipt_fuzzy_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+	register_match(&fuzzy_match);
+}