Harald Welte's other file (which Rusty forgot).

diff --git a/extensions/libipt_ULOG.c b/extensions/libipt_ULOG.c
new file mode 100644 (file)
index 0000000..f4d39fc
--- /dev/null
+++ b/extensions/libipt_ULOG.c
@@ -0,0 +1,163 @@
+/* Shared library add-on to iptables to add ULOG support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <getopt.h>
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ULOG.h>
+
+#define ULOG_DEFAULT_NLGROUP 1
+
+
+void print_groups(unsigned int gmask)
+{
+       int b;
+       unsigned int test;
+
+       for (b = 31; b >= 0; b--)
+       {
+               test = (1 << b);
+               if (gmask & test)
+                       printf("%d ", b + 1);
+       }
+}
+
+/* Function which prints out usage message. */
+static void help(void)
+{
+       printf(
+"ULOG v%s options:\n"
+" --ulog-nlgroup nlgroup               NETLINK grouo used for logging\n"
+" --ulog-prefix prefix         Prefix log messages with this prefix.\n\n",
+NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+       { "ulog-nlgroup", 1, 0, '!' },
+       { "ulog-prefix", 1, 0, '#' },
+       { 0 }
+};
+
+/* Initialize the target. */
+static void init(struct ipt_entry_target *t, unsigned int *nfcache)
+{
+       struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *)t->data;
+
+       loginfo->nl_group = ULOG_DEFAULT_NLGROUP;
+
+       /* Can't cache this */
+       *nfcache |= NFC_UNKNOWN;
+}
+
+#define IPT_LOG_OPT_NLGROUP 0x01
+#define IPT_LOG_OPT_PREFIX 0x02
+
+/* 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,
+      struct ipt_entry_target **target)
+{
+       struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *)(*target)->data;
+       int group_d;
+
+       switch (c) {
+       case '!':
+               if (*flags & IPT_LOG_OPT_NLGROUP)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Can't specify --ulog-nlgroup twice");
+
+               if (check_inverse(optarg, &invert))
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Unexpected `!' after --ulog-nlgroup");
+               group_d = atoi(optarg);
+               if (group_d > 32 || group_d < 1)
+                       exit_error(PARAMETER_PROBLEM,
+                               "--ulog-nlgroup has to be between 1 and 32");
+
+               loginfo->nl_group = (1 << (group_d -1));
+
+               *flags |= IPT_LOG_OPT_NLGROUP;
+               break;
+
+       case '#':
+               if (*flags & IPT_LOG_OPT_PREFIX)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Can't specify --ulog-prefix twice");
+
+               if (check_inverse(optarg, &invert))
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Unexpected `!' after --ulog-prefix");
+
+               if (strlen(optarg) > sizeof(loginfo->prefix) - 1)
+                       exit_error(PARAMETER_PROBLEM,
+                                  "Maximum prefix length %u for --ulog-prefix",
+                                  sizeof(loginfo->prefix) - 1);
+
+               strcpy(loginfo->prefix, optarg);
+               *flags |= IPT_LOG_OPT_PREFIX;
+               break;
+       }
+       return 1;
+}
+
+/* Final check; nothing. */
+static void final_check(unsigned int flags)
+{
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+        const struct ipt_ulog_info *loginfo
+                = (const struct ipt_ulog_info *)target->data;
+
+        if (strcmp(loginfo->prefix, "") != 0)
+                printf("--ulog-prefix %s ", loginfo->prefix);
+
+        if (loginfo->nl_group != ULOG_DEFAULT_NLGROUP)
+       {
+                printf("--ulog-nlgroup ");
+               print_groups(loginfo->nl_group);
+               printf("\n");
+       }
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target,
+      int numeric)
+{
+       const struct ipt_ulog_info *loginfo
+               = (const struct ipt_ulog_info *)target->data;
+
+       printf("ULOG ");
+       printf("nlgroup ");
+       print_groups(loginfo->nl_group);
+       if (strcmp(loginfo->prefix, "") != 0)
+               printf("prefix `%s' ", loginfo->prefix);
+}
+
+struct iptables_target ulog
+= { NULL,
+    "ULOG",
+    NETFILTER_VERSION,
+    IPT_ALIGN(sizeof(struct ipt_ulog_info)),
+    IPT_ALIGN(sizeof(struct ipt_ulog_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+       register_target(&ulog);
+}