From 08d7e58fdfc8d5007af0d60b846c50b743d75921 Mon Sep 17 00:00:00 2001
From: rusty <rusty>
Date: Mon, 31 Jul 2000 14:24:57 +0000
Subject: Harald Welte's other file (which Rusty forgot).

---
 extensions/libipt_ULOG.c | 163 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 extensions/libipt_ULOG.c

(limited to 'extensions')

diff --git a/extensions/libipt_ULOG.c b/extensions/libipt_ULOG.c
new file mode 100644
index 0000000..f4d39fc
--- /dev/null
+++ b/extensions/libipt_ULOG.c
@@ -0,0 +1,163 @@
+/* Shared library add-on to iptables to add ULOG support. */
+#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_ULOG.h>
+
+#define ULOG_DEFAULT_NLGROUP 1
+
+
+void print_groups(unsigned int gmask)
+{
+	int b;
+	unsigned int test;
+
+	for (b = 31; b >= 0; b--)
+	{
+		test = (1 << b);
+		if (gmask & test)
+			printf("%d ", b + 1);
+	}
+}
+
+/* Function which prints out usage message. */
+static void help(void)
+{
+	printf(
+"ULOG v%s options:\n"
+" --ulog-nlgroup nlgroup		NETLINK grouo used for logging\n"
+" --ulog-prefix prefix		Prefix log messages with this prefix.\n\n",
+NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+	{ "ulog-nlgroup", 1, 0, '!' },
+	{ "ulog-prefix", 1, 0, '#' },
+	{ 0 }
+};
+
+/* Initialize the target. */
+static void init(struct ipt_entry_target *t, unsigned int *nfcache)
+{
+	struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *)t->data;
+
+	loginfo->nl_group = ULOG_DEFAULT_NLGROUP;
+
+	/* Can't cache this */
+	*nfcache |= NFC_UNKNOWN;
+}
+
+#define IPT_LOG_OPT_NLGROUP 0x01
+#define IPT_LOG_OPT_PREFIX 0x02
+
+/* 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_ulog_info *loginfo = (struct ipt_ulog_info *)(*target)->data;
+	int group_d;
+
+	switch (c) {
+	case '!':
+		if (*flags & IPT_LOG_OPT_NLGROUP)
+			exit_error(PARAMETER_PROBLEM,
+				   "Can't specify --ulog-nlgroup twice");
+
+		if (check_inverse(optarg, &invert))
+			exit_error(PARAMETER_PROBLEM,
+				   "Unexpected `!' after --ulog-nlgroup");
+		group_d = atoi(optarg);
+		if (group_d > 32 || group_d < 1)
+			exit_error(PARAMETER_PROBLEM,
+				"--ulog-nlgroup has to be between 1 and 32");
+
+		loginfo->nl_group = (1 << (group_d -1));
+
+		*flags |= IPT_LOG_OPT_NLGROUP;
+		break;
+
+	case '#':
+		if (*flags & IPT_LOG_OPT_PREFIX)
+			exit_error(PARAMETER_PROBLEM,
+				   "Can't specify --ulog-prefix twice");
+
+		if (check_inverse(optarg, &invert))
+			exit_error(PARAMETER_PROBLEM,
+				   "Unexpected `!' after --ulog-prefix");
+
+		if (strlen(optarg) > sizeof(loginfo->prefix) - 1)
+			exit_error(PARAMETER_PROBLEM,
+				   "Maximum prefix length %u for --ulog-prefix",
+				   sizeof(loginfo->prefix) - 1);
+
+		strcpy(loginfo->prefix, optarg);
+		*flags |= IPT_LOG_OPT_PREFIX;
+		break;
+	}
+	return 1;
+}
+
+/* Final check; nothing. */
+static void final_check(unsigned int flags)
+{
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+        const struct ipt_ulog_info *loginfo
+                = (const struct ipt_ulog_info *)target->data;
+
+        if (strcmp(loginfo->prefix, "") != 0)
+                printf("--ulog-prefix %s ", loginfo->prefix);
+
+        if (loginfo->nl_group != ULOG_DEFAULT_NLGROUP)
+	{
+                printf("--ulog-nlgroup ");
+		print_groups(loginfo->nl_group);
+		printf("\n");
+	}
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target,
+      int numeric)
+{
+	const struct ipt_ulog_info *loginfo
+		= (const struct ipt_ulog_info *)target->data;
+
+	printf("ULOG ");
+	printf("nlgroup ");
+	print_groups(loginfo->nl_group);
+	if (strcmp(loginfo->prefix, "") != 0)
+		printf("prefix `%s' ", loginfo->prefix);
+}
+
+struct iptables_target ulog
+= { NULL,
+    "ULOG",
+    NETFILTER_VERSION,
+    IPT_ALIGN(sizeof(struct ipt_ulog_info)),
+    IPT_ALIGN(sizeof(struct ipt_ulog_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+	register_target(&ulog);
+}
-- 
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