--- /dev/null
+/* Shared library add-on to iptables to add ULOG support.
+ *
+ * (C) 2000 by Harald Welte <laforge@gnumonks.org>
+ *
+ * multipart netlink support based on ideas by Sebastian Zander
+ * <zander@fokus.gmd.de>
+ *
+ * This software is released under the terms of GNU GPL
+ *
+ * libipt_ULOG.c,v 1.7 2001/01/30 11:55:02 laforge Exp
+ */
+#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>
+/* For 64bit kernel / 32bit userspace */
+#include "../include/linux/netfilter_ipv4/ipt_ULOG.h"
+
+
+static 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 ULOG_help(void)
+{
+ printf("ULOG target options:\n"
+ " --ulog-nlgroup nlgroup NETLINK group used for logging\n"
+ " --ulog-cprange size Bytes of each packet to be passed\n"
+ " --ulog-qthreshold Threshold of in-kernel queue\n"
+ " --ulog-prefix prefix Prefix log messages with this prefix.\n");
+}
+
+static const struct option ULOG_opts[] = {
+ {"ulog-nlgroup", 1, NULL, '!'},
+ {"ulog-prefix", 1, NULL, '#'},
+ {"ulog-cprange", 1, NULL, 'A'},
+ {"ulog-qthreshold", 1, NULL, 'B'},
+ { .name = NULL }
+};
+
+/* Initialize the target. */
+static void ULOG_init(struct xt_entry_target *t)
+{
+ struct ipt_ulog_info *loginfo = (struct ipt_ulog_info *) t->data;
+
+ loginfo->nl_group = ULOG_DEFAULT_NLGROUP;
+ loginfo->qthreshold = ULOG_DEFAULT_QTHRESHOLD;
+
+}
+
+#define IPT_LOG_OPT_NLGROUP 0x01
+#define IPT_LOG_OPT_PREFIX 0x02
+#define IPT_LOG_OPT_CPRANGE 0x04
+#define IPT_LOG_OPT_QTHRESHOLD 0x08
+
+/* Function which parses command options; returns true if it
+ ate an option */
+static int ULOG_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_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, NULL, 0))
+ 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, NULL, 0))
+ 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",
+ (unsigned int)sizeof(loginfo->prefix) - 1);
+
+ if (strlen(optarg) == 0)
+ exit_error(PARAMETER_PROBLEM,
+ "No prefix specified for --ulog-prefix");
+
+ if (strlen(optarg) != strlen(strtok(optarg, "\n")))
+ exit_error(PARAMETER_PROBLEM,
+ "Newlines not allowed in --ulog-prefix");
+
+ strcpy(loginfo->prefix, optarg);
+ *flags |= IPT_LOG_OPT_PREFIX;
+ break;
+ case 'A':
+ if (*flags & IPT_LOG_OPT_CPRANGE)
+ exit_error(PARAMETER_PROBLEM,
+ "Can't specify --ulog-cprange twice");
+ if (atoi(optarg) < 0)
+ exit_error(PARAMETER_PROBLEM,
+ "Negative copy range?");
+ loginfo->copy_range = atoi(optarg);
+ *flags |= IPT_LOG_OPT_CPRANGE;
+ break;
+ case 'B':
+ if (*flags & IPT_LOG_OPT_QTHRESHOLD)
+ exit_error(PARAMETER_PROBLEM,
+ "Can't specify --ulog-qthreshold twice");
+ if (atoi(optarg) < 1)
+ exit_error(PARAMETER_PROBLEM,
+ "Negative or zero queue threshold ?");
+ if (atoi(optarg) > ULOG_MAX_QLEN)
+ exit_error(PARAMETER_PROBLEM,
+ "Maximum queue length exceeded");
+ loginfo->qthreshold = atoi(optarg);
+ *flags |= IPT_LOG_OPT_QTHRESHOLD;
+ break;
+ default:
+ return 0;
+ }
+ return 1;
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void ULOG_save(const void *ip, const struct xt_entry_target *target)
+{
+ const struct ipt_ulog_info *loginfo
+ = (const struct ipt_ulog_info *) target->data;
+
+ if (strcmp(loginfo->prefix, "") != 0) {
+ fputs("--ulog-prefix ", stdout);
+ save_string(loginfo->prefix);
+ }
+
+ if (loginfo->nl_group != ULOG_DEFAULT_NLGROUP) {
+ printf("--ulog-nlgroup ");
+ print_groups(loginfo->nl_group);
+ }
+ if (loginfo->copy_range)
+ printf("--ulog-cprange %u ", (unsigned int)loginfo->copy_range);
+
+ if (loginfo->qthreshold != ULOG_DEFAULT_QTHRESHOLD)
+ printf("--ulog-qthreshold %u ", (unsigned int)loginfo->qthreshold);
+}
+
+/* Prints out the targinfo. */
+static void ULOG_print(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ const struct ipt_ulog_info *loginfo
+ = (const struct ipt_ulog_info *) target->data;
+
+ printf("ULOG ");
+ printf("copy_range %u nlgroup ", (unsigned int)loginfo->copy_range);
+ print_groups(loginfo->nl_group);
+ if (strcmp(loginfo->prefix, "") != 0)
+ printf("prefix `%s' ", loginfo->prefix);
+ printf("queue_threshold %u ", (unsigned int)loginfo->qthreshold);
+}
+
+static struct xtables_target ulog_tg_reg = {
+ .name = "ULOG",
+ .version = XTABLES_VERSION,
+ .family = PF_INET,
+ .size = XT_ALIGN(sizeof(struct ipt_ulog_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct ipt_ulog_info)),
+ .help = ULOG_help,
+ .init = ULOG_init,
+ .parse = ULOG_parse,
+ .print = ULOG_print,
+ .save = ULOG_save,
+ .extra_opts = ULOG_opts,
+};
+
+void _init(void)
+{
+ xtables_register_target(&ulog_tg_reg);
+}
git://git.onelab.eu / iptables.git / blobdiff