Merge commit 'origin/trunk@12184' into fedora

[iptables.git] / trunk / extensions / libxt_comment.c

diff --git a/trunk/extensions/libxt_comment.c b/trunk/extensions/libxt_comment.c
new file mode 100644 (file)
index 0000000..abbb6cb
--- /dev/null
+++ b/trunk/extensions/libxt_comment.c
@@ -0,0 +1,127 @@
+/* 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>
+
+/* Function which prints out usage message. */
+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) {
+               exit_error(PARAMETER_PROBLEM,
+                       "COMMENT must be shorter than %i characters", XT_MAX_COMMENT_LEN);
+       }
+       strcpy((char *)info->comment, s);
+}
+
+/* Function which parses command options; returns true if it
+   ate an option */
+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':
+               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 comment_check(unsigned int flags)
+{
+       if (!flags)
+               exit_error(PARAMETER_PROBLEM,
+                          "COMMENT match: You must specify `--comment'");
+}
+
+/* Prints out the matchinfo. */
+static void
+comment_print(const void *ip, const struct xt_entry_match *match, int numeric)
+{
+       struct xt_comment_info *commentinfo = (struct xt_comment_info *)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 = (struct xt_comment_info *)match->data;
+
+       commentinfo->comment[XT_MAX_COMMENT_LEN-1] = '\0';
+       printf("--comment \"%s\" ", commentinfo->comment);
+}
+
+static struct xtables_match comment_match = {
+       .family         = AF_INET,
+       .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,
+};
+
+static struct xtables_match comment_match6 = {
+       .family         = AF_INET6,
+       .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);
+       xtables_register_match(&comment_match6);
+}