1 files changed, 108 insertions, 0 deletions
diff --git a/extensions/libxt_comment.c b/extensions/libxt_comment.c
new file mode 100644
index 0000000..0068a6e
--- /dev/null
+++ b/extensions/libxt_comment.c
@@ -0,0 +1,108 @@
+/* Shared library add-on to iptables to add comment match support.
+ *
+ * ChangeLog
+ *     2003-05-13: Brad Fisher <brad@info-link.net>
+ *         Initial comment match
+ *     2004-05-12: Brad Fisher <brad@info-link.net>
+ *         Port to patch-o-matic-ng
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <xtables.h>
+#include <linux/netfilter/xt_comment.h>
+
+static void comment_help(void)
+{
+	printf(
+		"comment match options:\n"
+		"--comment COMMENT             Attach a comment to a rule\n");
+}
+
+static const struct option comment_opts[] = {
+	{ "comment", 1, NULL, '1' },
+	{ .name = NULL }
+};
+
+static void
+parse_comment(const char *s, struct xt_comment_info *info)
+{	
+	int slen = strlen(s);
+
+	if (slen >= XT_MAX_COMMENT_LEN) {
+		xtables_error(PARAMETER_PROBLEM,
+			"COMMENT must be shorter than %i characters", XT_MAX_COMMENT_LEN);
+	}
+	strcpy((char *)info->comment, s);
+}
+
+static int
+comment_parse(int c, char **argv, int invert, unsigned int *flags,
+              const void *entry, struct xt_entry_match **match)
+{
+	struct xt_comment_info *commentinfo = (struct xt_comment_info *)(*match)->data;
+
+	switch (c) {
+	case '1':
+		xtables_check_inverse(optarg, &invert, &optind, 0, argv);
+		if (invert) {
+			xtables_error(PARAMETER_PROBLEM,
+					"Sorry, you can't have an inverted comment");
+		}
+		parse_comment(optarg, commentinfo);
+		*flags = 1;
+		break;
+
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static void comment_check(unsigned int flags)
+{
+	if (!flags)
+		xtables_error(PARAMETER_PROBLEM,
+			   "COMMENT match: You must specify `--comment'");
+}
+
+static void
+comment_print(const void *ip, const struct xt_entry_match *match, int numeric)
+{
+	struct xt_comment_info *commentinfo = (void *)match->data;
+
+	commentinfo->comment[XT_MAX_COMMENT_LEN-1] = '\0';
+	printf("/* %s */ ", commentinfo->comment);
+}
+
+/* Saves the union ipt_matchinfo in parsable form to stdout. */
+static void
+comment_save(const void *ip, const struct xt_entry_match *match)
+{
+	struct xt_comment_info *commentinfo = (void *)match->data;
+
+	commentinfo->comment[XT_MAX_COMMENT_LEN-1] = '\0';
+	printf("--comment ");
+	xtables_save_string((const char *)commentinfo->comment);
+}
+
+static struct xtables_match comment_match = {
+	.family		= NFPROTO_UNSPEC,
+	.name		= "comment",
+	.version	= XTABLES_VERSION,
+	.size		= XT_ALIGN(sizeof(struct xt_comment_info)),
+	.userspacesize	= XT_ALIGN(sizeof(struct xt_comment_info)),
+	.help		= comment_help,
+	.parse		= comment_parse,
+	.final_check	= comment_check,
+	.print 		= comment_print,
+	.save 		= comment_save,
+	.extra_opts	= comment_opts,
+};
+
+void _init(void)
+{
+	xtables_register_match(&comment_match);
+}