psd match fix. Due to a typo in the pathname not all files have been applied.

diff --git a/extensions/.psd-test b/extensions/.psd-test
new file mode 100755 (executable)
index 0000000..9d05088
--- /dev/null
+++ b/extensions/.psd-test
@@ -0,0 +1,3 @@
+#!/bin/sh
+# True if psd is applied.
+[ -f $KERNEL_DIR/include/linux/netfilter_ipv4/ipt_psd.h ] && echo psd

diff --git a/extensions/libipt_psd.c b/extensions/libipt_psd.c
new file mode 100644 (file)
index 0000000..f688502
--- /dev/null
+++ b/extensions/libipt_psd.c
@@ -0,0 +1,199 @@
+/* 
+  Shared library add-on to iptables to add PSD support 
+   
+  Copyright (C) 2000,2001 astaro AG
+
+  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
+
+  2000-05-04 Markus Hennig <hennig@astaro.de> : initial
+  2000-08-18 Dennis Koslowski <koslowski@astaro.de> : first release
+  2000-12-01 Dennis Koslowski <koslowski@astaro.de> : UDP scans detection added
+  2001-02-04 Jan Rekorajski <baggins@pld.org.pl> : converted from target to match
+*/
+
+#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_psd.h>
+
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+       printf(
+"psd v%s options:\n"
+" --psd-weight-threshold threshhold  Portscan detection weight threshold\n\n"
+" --psd-delay-threshold  delay       Portscan detection delay threshold\n\n"
+" --psd-lo-ports-weight  lo          Privileged ports weight\n\n"
+" --psd-hi-ports-weight  hi          High ports weight\n\n",
+NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+       { "psd-weight-threshold", 1, 0, '1' },
+       { "psd-delay-threshold", 1, 0, '2' },
+       { "psd-lo-ports-weight", 1, 0, '3' },
+       { "psd-hi-ports-weight", 1, 0, '4' },
+       { 0 }
+};
+
+/* Initialize the target. */
+static void
+init(struct ipt_entry_match *m, unsigned int *nfcache)
+{
+       struct ipt_psd_info *psdinfo = (struct ipt_psd_info *)m->data;
+
+       psdinfo->weight_threshold = SCAN_WEIGHT_THRESHOLD;  
+       psdinfo->delay_threshold = SCAN_DELAY_THRESHOLD;
+       psdinfo->lo_ports_weight = PORT_WEIGHT_PRIV;
+       psdinfo->hi_ports_weight = PORT_WEIGHT_HIGH;
+       /* Can't cache this */
+       *nfcache |= NFC_UNKNOWN;
+}
+
+
+typedef struct _code {
+       char    *c_name;
+       int     c_val;
+} CODE;
+
+
+
+#define IPT_PSD_OPT_CTRESH 0x01
+#define IPT_PSD_OPT_DTRESH 0x02
+#define IPT_PSD_OPT_LPWEIGHT 0x04
+#define IPT_PSD_OPT_HPWEIGHT 0x08
+
+/* 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_psd_info *psdinfo = (struct ipt_psd_info *)(*match)->data;
+       int num;
+
+       switch (c) {
+       /* PSD-weight-threshold */
+       case '1':
+               if (*flags & IPT_PSD_OPT_CTRESH)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Can't specify --psd-weight-threshold "
+                                  "twice");
+                num = string_to_number(optarg, 0, 10000);
+                if (num <= 0)
+                        exit_error(PARAMETER_PROBLEM,
+                                   "bad --psd-weight-threshold `%s'", optarg);
+               psdinfo->weight_threshold = num;
+               *flags |= IPT_PSD_OPT_CTRESH;
+               break;
+
+       /* PSD-delay-threshold */
+       case '2':
+               if (*flags & IPT_PSD_OPT_DTRESH)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Can't specify --psd-delay-threshold twice");
+                num = string_to_number(optarg, 0, 10000);
+                if (num <= 0)
+                        exit_error(PARAMETER_PROBLEM,
+                                   "bad --psd-delay-threshold `%s'", optarg);
+               psdinfo->delay_threshold = num;
+               *flags |= IPT_PSD_OPT_DTRESH;
+               break;
+
+       /* PSD-lo-ports-weight */
+       case '3':
+               if (*flags & IPT_PSD_OPT_LPWEIGHT)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Can't specify --psd-lo-ports-weight twice");
+                num = string_to_number(optarg, 0, 10000);
+                if (num <= 0)
+                        exit_error(PARAMETER_PROBLEM,
+                                   "bad --psd-lo-ports-weight `%s'", optarg);
+               psdinfo->lo_ports_weight = num;
+               *flags |= IPT_PSD_OPT_LPWEIGHT;
+               break;
+
+       /* PSD-hi-ports-weight */
+       case '4':
+               if (*flags & IPT_PSD_OPT_HPWEIGHT)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Can't specify --psd-hi-ports-weight twice");
+                num = string_to_number(optarg, 0, 10000);
+                if (num <= 0)
+                        exit_error(PARAMETER_PROBLEM,
+                                   "bad --psd-hi-ports-weight `%s'", optarg);
+               psdinfo->hi_ports_weight = num;
+               *flags |= IPT_PSD_OPT_HPWEIGHT;
+               break;
+
+       default:
+               return 0;
+       }
+
+       return 1;
+}
+
+/* Final check; nothing. */
+static void final_check(unsigned int flags)
+{
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_match *match,
+      int numeric)
+{
+       const struct ipt_psd_info *psdinfo
+               = (const struct ipt_psd_info *)match->data;
+
+       printf("psd ");
+       printf("weight-threshold: %u ",psdinfo->weight_threshold);
+       printf("delay-threshold: %u ",psdinfo->delay_threshold);
+       printf("lo-ports-weight: %u ",psdinfo->lo_ports_weight);
+       printf("hi-ports-weight: %u ",psdinfo->hi_ports_weight);
+}
+
+/* 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_psd_info *psdinfo
+               = (const struct ipt_psd_info *)match->data;
+
+       printf("--psd-weight-threshold %u ", psdinfo->weight_threshold);
+       printf("--psd-delay-threshold %u ", psdinfo->delay_threshold);
+       printf("--psd-lo-ports-weight %u ",psdinfo->lo_ports_weight);
+       printf("--psd-hi-ports-weight %u ",psdinfo->hi_ports_weight);
+}
+
+struct iptables_match psd
+= { NULL,
+    "psd",
+    NETFILTER_VERSION,
+    IPT_ALIGN(sizeof(struct ipt_psd_info)),
+    IPT_ALIGN(sizeof(struct ipt_psd_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+       register_match(&psd);
+}