Git init

1 files changed, 158 insertions, 0 deletions

diff --git a/extensions/libxt_NFLOG.c b/extensions/libxt_NFLOG.c
new file mode 100644
index 0000000..e2185d5
--- /dev/null
+++ b/extensions/libxt_NFLOG.c
@@ -0,0 +1,158 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <getopt.h>
+#include <xtables.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_NFLOG.h>
+
+enum {
+	NFLOG_GROUP	= 0x1,
+	NFLOG_PREFIX	= 0x2,
+	NFLOG_RANGE	= 0x4,
+	NFLOG_THRESHOLD	= 0x8,
+};
+
+static const struct option NFLOG_opts[] = {
+	{ "nflog-group",     1, NULL, NFLOG_GROUP },
+	{ "nflog-prefix",    1, NULL, NFLOG_PREFIX },
+	{ "nflog-range",     1, NULL, NFLOG_RANGE },
+	{ "nflog-threshold", 1, NULL, NFLOG_THRESHOLD },
+	{ .name = NULL }
+};
+
+static void NFLOG_help(void)
+{
+	printf("NFLOG target options:\n"
+	       " --nflog-group NUM		NETLINK group used for logging\n"
+	       " --nflog-range NUM		Number of byte to copy\n"
+	       " --nflog-threshold NUM		Message threshold of in-kernel queue\n"
+	       " --nflog-prefix STRING		Prefix string for log messages\n");
+}
+
+static void NFLOG_init(struct xt_entry_target *t)
+{
+	struct xt_nflog_info *info = (struct xt_nflog_info *)t->data;
+
+	info->group	= 0;
+	info->threshold	= XT_NFLOG_DEFAULT_THRESHOLD;
+}
+
+static int NFLOG_parse(int c, char **argv, int invert, unsigned int *flags,
+                       const void *entry, struct xt_entry_target **target)
+{
+	struct xt_nflog_info *info = (struct xt_nflog_info *)(*target)->data;
+	int n;
+	size_t length;
+
+	switch (c) {
+	case NFLOG_GROUP:
+		if (*flags & NFLOG_GROUP)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Can't specify --nflog-group twice");
+		if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
+			xtables_error(PARAMETER_PROBLEM,
+				   "Unexpected `!' after --nflog-group");
+
+		n = atoi(optarg);
+		if (n < 0)
+			xtables_error(PARAMETER_PROBLEM,
+				   "--nflog-group can not be negative");
+		info->group = n;
+		break;
+	case NFLOG_PREFIX:
+		if (*flags & NFLOG_PREFIX)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Can't specify --nflog-prefix twice");
+		if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
+			xtables_error(PARAMETER_PROBLEM,
+				   "Unexpected `!' after --nflog-prefix");
+
+		length = strlen(optarg);
+		if (length == 0)
+			xtables_error(PARAMETER_PROBLEM,
+				   "No prefix specified for --nflog-prefix");
+		if (length >= sizeof(info->prefix))
+			xtables_error(PARAMETER_PROBLEM,
+				   "--nflog-prefix too long, max %Zu characters",
+				   sizeof(info->prefix) - 1);
+		if (length != strlen(strtok(optarg, "\n")))
+			xtables_error(PARAMETER_PROBLEM,
+				   "Newlines are not allowed in --nflog-prefix");
+		strcpy(info->prefix, optarg);
+		break;
+	case NFLOG_RANGE:
+		if (*flags & NFLOG_RANGE)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Can't specify --nflog-range twice");
+		n = atoi(optarg);
+		if (n < 0)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Invalid --nflog-range, must be >= 0");
+		info->len = n;
+		break;
+	case NFLOG_THRESHOLD:
+		if (*flags & NFLOG_THRESHOLD)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Can't specify --nflog-threshold twice");
+		n = atoi(optarg);
+		if (n < 1)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Invalid --nflog-threshold, must be >= 1");
+		info->threshold = n;
+		break;
+	default:
+		return 0;
+	}
+	*flags |= c;
+	return 1;
+}
+
+static void nflog_print(const struct xt_nflog_info *info, char *prefix)
+{
+	if (info->prefix[0] != '\0') {
+		printf("%snflog-prefix ", prefix);
+		xtables_save_string(info->prefix);
+	}
+	if (info->group)
+		printf("%snflog-group %u ", prefix, info->group);
+	if (info->len)
+		printf("%snflog-range %u ", prefix, info->len);
+	if (info->threshold != XT_NFLOG_DEFAULT_THRESHOLD)
+		printf("%snflog-threshold %u ", prefix, info->threshold);
+}
+
+static void NFLOG_print(const void *ip, const struct xt_entry_target *target,
+                        int numeric)
+{
+	const struct xt_nflog_info *info = (struct xt_nflog_info *)target->data;
+
+	nflog_print(info, "");
+}
+
+static void NFLOG_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct xt_nflog_info *info = (struct xt_nflog_info *)target->data;
+
+	nflog_print(info, "--");
+}
+
+static struct xtables_target nflog_target = {
+	.family		= NFPROTO_UNSPEC,
+	.name		= "NFLOG",
+	.version	= XTABLES_VERSION,
+	.size		= XT_ALIGN(sizeof(struct xt_nflog_info)),
+	.userspacesize	= XT_ALIGN(sizeof(struct xt_nflog_info)),
+	.help		= NFLOG_help,
+	.init		= NFLOG_init,
+	.parse		= NFLOG_parse,
+	.print		= NFLOG_print,
+	.save		= NFLOG_save,
+	.extra_opts	= NFLOG_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&nflog_target);
+}