Initial import from SVN

1 files changed, 130 insertions, 0 deletions

diff --git a/src/lib/protocols/syslog.c b/src/lib/protocols/syslog.c
new file mode 100644
index 000000000..b4732bfca
--- /dev/null
+++ b/src/lib/protocols/syslog.c
@@ -0,0 +1,130 @@
+/*
+ * syslog.c
+ *
+ * Copyright (C) 2009-2011 by ipoque GmbH
+ * Copyright (C) 2011-15 - ntop.org
+ *
+ * This file is part of nDPI, an open source deep packet inspection
+ * library based on the OpenDPI and PACE technology by ipoque GmbH
+ *
+ * nDPI is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * nDPI is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with nDPI.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+
+#include "ndpi_protocols.h"
+#ifdef NDPI_PROTOCOL_SYSLOG
+
+static void ndpi_int_syslog_add_connection(struct ndpi_detection_module_struct
+											 *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+	ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_SYSLOG, NDPI_REAL_PROTOCOL);
+}
+
+void ndpi_search_syslog(struct ndpi_detection_module_struct
+						  *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+	struct ndpi_packet_struct *packet = &flow->packet;
+	
+//      struct ndpi_id_struct         *src=ndpi_struct->src;
+//      struct ndpi_id_struct         *dst=ndpi_struct->dst;
+
+	u_int8_t i;
+
+	NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG, "search syslog\n");
+
+	if (packet->payload_packet_len > 20 && packet->payload_packet_len <= 1024 && packet->payload[0] == '<') {
+		NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG, "checked len>20 and <1024 and first symbol=<.\n");
+		i = 1;
+
+		for (;;) {
+			if (packet->payload[i] < '0' || packet->payload[i] > '9' || i++ > 3) {
+				NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG,
+						"read symbols while the symbol is a number.\n");
+				break;
+			}
+		}
+
+		if (packet->payload[i++] != '>') {
+			NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG, "there is no > following the number.\n");
+			NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SYSLOG);
+			return;
+		} else {
+			NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG, "a > following the number.\n");
+		}
+
+		if (packet->payload[i] == 0x20) {
+			NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG, "a blank following the >: increment i.\n");
+			i++;
+		} else {
+			NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG, "no blank following the >: do nothing.\n");
+		}
+
+		/* check for "last message repeated" */
+		if (i + sizeof("last message") - 1 <= packet->payload_packet_len &&
+			memcmp(packet->payload + i, "last message", sizeof("last message") - 1) == 0) {
+
+			NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG, "found syslog by 'last message' string.\n");
+
+			ndpi_int_syslog_add_connection(ndpi_struct, flow);
+
+			return;
+		} else if (i + sizeof("snort: ") - 1 <= packet->payload_packet_len &&
+				   memcmp(packet->payload + i, "snort: ", sizeof("snort: ") - 1) == 0) {
+
+			/* snort events */
+
+			NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG, "found syslog by 'snort: ' string.\n");
+
+			ndpi_int_syslog_add_connection(ndpi_struct, flow);
+
+			return;
+		}
+
+		if (memcmp(&packet->payload[i], "Jan", 3) != 0
+			&& memcmp(&packet->payload[i], "Feb", 3) != 0
+			&& memcmp(&packet->payload[i], "Mar", 3) != 0
+			&& memcmp(&packet->payload[i], "Apr", 3) != 0
+			&& memcmp(&packet->payload[i], "May", 3) != 0
+			&& memcmp(&packet->payload[i], "Jun", 3) != 0
+			&& memcmp(&packet->payload[i], "Jul", 3) != 0
+			&& memcmp(&packet->payload[i], "Aug", 3) != 0
+			&& memcmp(&packet->payload[i], "Sep", 3) != 0
+			&& memcmp(&packet->payload[i], "Oct", 3) != 0
+			&& memcmp(&packet->payload[i], "Nov", 3) != 0 && memcmp(&packet->payload[i], "Dec", 3) != 0) {
+
+
+			NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG,
+					"no month-shortname following: syslog excluded.\n");
+
+			NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SYSLOG);
+
+			return;
+
+		} else {
+
+			NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG,
+					"a month-shortname following: syslog detected.\n");
+
+			ndpi_int_syslog_add_connection(ndpi_struct, flow);
+
+			return;
+		}
+	}
+	NDPI_LOG(NDPI_PROTOCOL_SYSLOG, ndpi_struct, NDPI_LOG_DEBUG, "no syslog detected.\n");
+
+	NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SYSLOG);
+}
+
+#endif