condition: import 20080125 code base

extensions/libxt_condition.c

@@ -0,0 +1,90 @@
+/* Shared library add-on to iptables for condition match */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include <xtables.h>
+#include "xt_condition.h"
+
+static void condition_help(void)
+{
+	printf("condition match options:\n"
+	       "--condition [!] filename       "
+	       "Match on boolean value stored in /proc file\n");
+}
+
+static const struct option condition_opts[] = {
+	{ .name = "condition", .has_arg = 1, .flag = 0, .val = 'X' },
+	{ .name = 0 }
+};
+
+static int condition_parse(int c, char **argv, int invert, unsigned int *flags,
+                           const void *entry, struct xt_entry_match **match)
+{
+	struct condition_info *info =
+	    (struct condition_info *) (*match)->data;
+
+	if (c == 'X') {
+		if (*flags)
+			exit_error(PARAMETER_PROBLEM,
+				   "Can't specify multiple conditions");
+
+		check_inverse(optarg, &invert, &optind, 0);
+
+		if (strlen(argv[optind - 1]) < CONDITION_NAME_LEN)
+			strcpy(info->name, argv[optind - 1]);
+		else
+			exit_error(PARAMETER_PROBLEM,
+				   "File name too long");
+
+		info->invert = invert;
+		*flags = 1;
+		return 1;
+	}
+
+	return 0;
+}
+
+static void condition_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM,
+			   "Condition match: must specify --condition");
+}
+
+static void condition_print(const void *ip, const struct xt_entry_match *match,
+                            int numeric)
+{
+	const struct condition_info *info =
+	    (const struct condition_info *) match->data;
+
+	printf("condition %s%s ", (info->invert) ? "!" : "", info->name);
+}
+
+
+static void condition_save(const void *ip, const struct xt_entry_match *match)
+{
+	const struct condition_info *info =
+	    (const struct condition_info *) match->data;
+
+	printf("--condition %s\"%s\" ", (info->invert) ? "! " : "", info->name);
+}
+
+static struct xtables_match condition_match = {
+	.name 		= "condition",
+	.version 	= XTABLES_VERSION,
+	.size 		= XT_ALIGN(sizeof(struct condition_info)),
+	.userspacesize 	= XT_ALIGN(sizeof(struct condition_info)),
+	.help 		= condition_help,
+	.parse 		= condition_parse,
+	.final_check	= condition_check,
+	.print 		= condition_print,
+	.save 		= condition_save,
+	.extra_opts 	= condition_opts,
+};
+
+void _init(void);
+void _init(void)
+{
+	xtables_register_match(&condition_match);
+}