This patch adds the log 'watcher' extension.
The work was started by Giuseppe Longo <giuseppelng@xxxxxxxxx> and finised
by me.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@xxxxxxxxx>
---
extensions/libebt_log.c | 197 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 197 insertions(+)
create mode 100644 extensions/libebt_log.c
diff --git a/extensions/libebt_log.c b/extensions/libebt_log.c
new file mode 100644
index 0000000..0799185
--- /dev/null
+++ b/extensions/libebt_log.c
@@ -0,0 +1,197 @@
+/*
+ * Bart De Schuymer <bdschuym@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Giuseppe Longo <giuseppelng@xxxxxxxxx> adapted the original code to the
+ * xtables-compat environment in 2015.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <string.h>
+#include <getopt.h>
+#include <xtables.h>
+#include <linux/netfilter_bridge/ebt_log.h>
+
+#define LOG_DEFAULT_LEVEL LOG_INFO
+
+#define LOG_PREFIX '1'
+#define LOG_LEVEL '2'
+#define LOG_ARP '3'
+#define LOG_IP '4'
+#define LOG_LOG '5'
+#define LOG_IP6 '6'
+
+typedef struct _code {
+ char *c_name;
+ int c_val;
+} CODE;
+
+static CODE eight_priority[] = {
+ { "emerg", LOG_EMERG },
+ { "alert", LOG_ALERT },
+ { "crit", LOG_CRIT },
+ { "error", LOG_ERR },
+ { "warning", LOG_WARNING },
+ { "notice", LOG_NOTICE },
+ { "info", LOG_INFO },
+ { "debug", LOG_DEBUG }
+};
+
+static int name_to_loglevel(const char *arg)
+{
+ int i;
+
+ for (i = 0; i < 8; i++)
+ if (!strcmp(arg, eight_priority[i].c_name))
+ return eight_priority[i].c_val;
+
+ /* return bad loglevel */
+ return 9;
+}
+
+static const struct option brlog_opts[] = {
+ { .name = "log-prefix", .has_arg = true, .val = LOG_PREFIX },
+ { .name = "log-level", .has_arg = true, .val = LOG_LEVEL },
+ { .name = "log-arp", .has_arg = false, .val = LOG_ARP },
+ { .name = "log-ip", .has_arg = false, .val = LOG_IP },
+ { .name = "log", .has_arg = false, .val = LOG_LOG },
+ { .name = "log-ip6", .has_arg = false, .val = LOG_IP6 },
+ XT_GETOPT_TABLEEND,
+};
+
+static void brlog_help(void)
+{
+ int i;
+
+ printf(
+"log options:\n"
+"--log : use this if you're not specifying anything\n"
+"--log-level level : level = [1-8] or a string\n"
+"--log-prefix prefix : max. %d chars.\n"
+"--log-ip : put ip info. in the log for ip packets\n"
+"--log-arp : put (r)arp info. in the log for (r)arp packets\n"
+"--log-ip6 : put ip6 info. in the log for ip6 packets\n"
+ , EBT_LOG_PREFIX_SIZE - 1);
+ for (i = 0; i < 8; i++)
+ printf("%d = %s\n", eight_priority[i].c_val,
+ eight_priority[i].c_name);
+}
+
+static void brlog_init(struct xt_entry_target *t)
+{
+ struct ebt_log_info *loginfo = (struct ebt_log_info *)t->data;
+
+ loginfo->bitmask = 0;
+ loginfo->prefix[0] = '\0';
+ loginfo->loglevel = LOG_NOTICE;
+}
+
+static int brlog_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_target **target)
+{
+ struct ebt_log_info *loginfo = (struct ebt_log_info *)(*target)->data;
+ long int i;
+ char *end;
+
+ switch (c) {
+ case LOG_PREFIX:
+ if (invert)
+ xtables_error(PARAMETER_PROBLEM,
+ "Unexpected `!` after --log-prefix");
+ if (strlen(optarg) > sizeof(loginfo->prefix) - 1)
+ xtables_error(PARAMETER_PROBLEM,
+ "Prefix too long");
+ if (strchr(optarg, '\"'))
+ xtables_error(PARAMETER_PROBLEM,
+ "Use of \\\" is not allowed"
+ " in the prefix");
+ strcpy((char *)loginfo->prefix, (char *)optarg);
+ break;
+ case LOG_LEVEL:
+ i = strtol(optarg, &end, 16);
+ if (*end != '\0' || i < 0 || i > 7)
+ loginfo->loglevel = name_to_loglevel(optarg);
+ else
+ loginfo->loglevel = i;
+
+ if (loginfo->loglevel == 9)
+ xtables_error(PARAMETER_PROBLEM,
+ "Problem with the log-level");
+ break;
+ case LOG_IP:
+ if (invert)
+ xtables_error(PARAMETER_PROBLEM,
+ "Unexpected `!' after --log-ip");
+ loginfo->bitmask |= EBT_LOG_IP;
+ break;
+ case LOG_ARP:
+ if (invert)
+ xtables_error(PARAMETER_PROBLEM,
+ "Unexpected `!' after --log-arp");
+ loginfo->bitmask |= EBT_LOG_ARP;
+ case LOG_LOG:
+ if (invert)
+ xtables_error(PARAMETER_PROBLEM,
+ "Unexpected `!' after --log");
+ break;
+ case LOG_IP6:
+ if (invert)
+ xtables_error(PARAMETER_PROBLEM,
+ "Unexpected `!' after --log-ip6");
+ loginfo->bitmask |= EBT_LOG_IP6;
+ break;
+ default:
+ return 0;
+ }
+
+ *flags |= loginfo->bitmask;
+ return 1;
+}
+
+static void brlog_final_check(unsigned int flags)
+{
+}
+
+static void brlog_print(const void *ip, const struct xt_entry_target *target,
+ int numeric)
+{
+ struct ebt_log_info *loginfo = (struct ebt_log_info *)target->data;
+
+ printf("--log-level %s --log-prefix \"%s\"",
+ eight_priority[loginfo->loglevel].c_name,
+ loginfo->prefix);
+
+ if (loginfo->bitmask & EBT_LOG_IP)
+ printf(" --log-ip");
+ if (loginfo->bitmask & EBT_LOG_ARP)
+ printf(" --log-arp");
+ if (loginfo->bitmask & EBT_LOG_IP6)
+ printf(" --log-ip6");
+ printf(" ");
+}
+
+static struct xtables_target brlog_target = {
+ .name = "log",
+ .revision = 0,
+ .version = XTABLES_VERSION,
+ .family = NFPROTO_BRIDGE,
+ .size = XT_ALIGN(sizeof(struct ebt_log_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct ebt_log_info)),
+ .init = brlog_init,
+ .help = brlog_help,
+ .parse = brlog_parse,
+ .final_check = brlog_final_check,
+ .print = brlog_print,
+ .extra_opts = brlog_opts,
+};
+
+void _init(void)
+{
+ xtables_register_target(&brlog_target);
+}
--
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