iptables-1.3.2-20050720

[iptables.git] / extensions / libipt_comment.c

diff --git a/extensions/libipt_comment.c b/extensions/libipt_comment.c
new file mode 100644 (file)
index 0000000..c543fc6
--- /dev/null
+++ b/extensions/libipt_comment.c
@@ -0,0 +1,119 @@
+/* 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 <iptables.h>
+#include <linux/netfilter_ipv4/ipt_comment.h>
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+       printf(
+               "COMMENT match options:\n"
+               "--comment COMMENT             Attach a comment to a rule\n\n"
+               );
+}
+
+static struct option opts[] = {
+       { "comment", 1, 0, '1' },
+       {0}
+};
+
+static void
+parse_comment(const unsigned char *s, struct ipt_comment_info *info)
+{      
+       int slen = strlen(s);
+
+       if (slen >= IPT_MAX_COMMENT_LEN) {
+               exit_error(PARAMETER_PROBLEM,
+                       "COMMENT must be shorter than %i characters", IPT_MAX_COMMENT_LEN);
+       }
+       strcpy(info->comment, s);
+}
+
+/* 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_comment_info *commentinfo = (struct ipt_comment_info *)(*match)->data;
+
+       switch (c) {
+       case '1':
+               check_inverse(argv[optind-1], &invert, &optind, 0);
+               if (invert) {
+                       exit_error(PARAMETER_PROBLEM,
+                                       "Sorry, you can't have an inverted comment");
+               }
+               parse_comment(argv[optind-1], commentinfo);
+               *flags = 1;
+               break;
+
+       default:
+               return 0;
+       }
+       return 1;
+}
+
+/* Final check; must have specified --comment. */
+static void
+final_check(unsigned int flags)
+{
+       if (!flags)
+               exit_error(PARAMETER_PROBLEM,
+                          "COMMENT match: You must specify `--comment'");
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_match *match,
+      int numeric)
+{
+       struct ipt_comment_info *commentinfo = (struct ipt_comment_info *)match->data;
+
+       commentinfo->comment[IPT_MAX_COMMENT_LEN-1] = '\0';
+       printf("/* %s */ ", commentinfo->comment);
+}
+
+/* Saves the union ipt_matchinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
+{
+       struct ipt_comment_info *commentinfo = (struct ipt_comment_info *)match->data;
+
+       commentinfo->comment[IPT_MAX_COMMENT_LEN-1] = '\0';
+       printf("--comment \"%s\" ", commentinfo->comment);
+}
+
+static struct iptables_match comment = {
+    .next              = NULL,
+    .name              = "comment",
+    .version           = IPTABLES_VERSION,
+    .size              = IPT_ALIGN(sizeof(struct ipt_comment_info)),
+    .userspacesize     = IPT_ALIGN(sizeof(struct ipt_comment_info)),
+    .help              = &help,
+    .parse             = &parse,
+    .final_check       = &final_check,
+    .print             = &print,
+    .save              = &save,
+    .extra_opts                = opts
+};
+
+void _init(void)
+{
+       register_match(&comment);
+}