Create quic.c

1 files changed, 100 insertions, 0 deletions

diff --git a/src/lib/protocols/quic.c b/src/lib/protocols/quic.c
new file mode 100644
index 000000000..6a9fd48b8
--- /dev/null
+++ b/src/lib/protocols/quic.c
@@ -0,0 +1,100 @@
+/*
+ * quic.c
+ *
+ * Copyright (C) 2015 - Andrea Buscarinu <andrea.buscarinu@gmail.com>
+ * Copyright (C) 2015 - Michele Campus <fci1908@gmail.com>
+ * Copyright (C) 2012-15 - ntop.org
+ *
+ * This module 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.
+ *
+ * This module 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.
+ * If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+#include "ndpi_api.h"
+
+#define SEQ_CID_MASK_ALL 0x3c // 0011 1100
+#define QUIC_VER_MASK 0x01    // 0000 0001
+#define CID_LEN_8 0x0C        // 0000 1100
+#define CID_LEN_4 0x08        // 0000 1000
+#define CID_LEN_1 0x04        // 0000 0100
+#define CID_LEN_0 0x00        // 0000 0000
+#define CID_MASK 0x0C         // 0000 1100
+
+
+#ifdef NDPI_PROTOCOL_QUIC
+static void ndpi_int_quic_add_connection(struct ndpi_detection_module_struct
+                                         *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+    ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_QUIC, NDPI_REAL_PROTOCOL);
+}
+
+void ndpi_search_quic(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+    struct ndpi_packet_struct *packet = &flow->packet;
+    u_int16_t dport = 0, sport = 0;
+    u_int ver_offset;
+    u_int cid_len;
+
+     if(packet->udp != NULL) {
+        sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
+        NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "calculating quic over udp.\n");
+
+        // Settings without version. First check if PUBLIC FLAGS & SEQ bytes are 0x0. SEQ must be 1 at least.
+        if ((sport == 443 || dport == 443) && (((packet->payload[0] == 0x00 && packet->payload[1] != 0x00) ||
+                                                (packet->payload[0] == 0x10)  || (packet->payload[0] == 0x0c)  ||
+                                                (packet->payload[0] == 0x1c)) || (packet->payload[0] & SEQ_CID_MASK_ALL)))
+        {
+            NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found quic.\n");
+            ndpi_int_quic_add_connection(ndpi_struct, flow);
+
+        // Check if version, than the CID length.
+        } else if (packet->payload[0] & QUIC_VER_MASK)
+        {
+            // Has version, check CID length.
+            switch (packet->payload[0] & CID_MASK)
+            {
+               case CID_LEN_8: cid_len = 8; break;
+               case CID_LEN_4: cid_len = 4; break;
+               case CID_LEN_1: cid_len = 1; break;
+               case CID_LEN_0: cid_len = 0; break;
+               default:
+                   NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n");
+                   NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC);
+            }
+
+            // Version offset.
+            ver_offset = 1 + cid_len;
+            unsigned char vers[] = { packet->payload[ver_offset + 1], packet->payload[ver_offset + 2],
+                                     packet->payload[ver_offset + 3], packet->payload[ver_offset + 4]};
+            // Check version match.
+            if (vers[0] == 'Q' && vers[1] == '0' &&
+                (vers[2] == '2' && (vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' ||
+                                    vers[3] == '1' || vers[3] == '0')) ||
+                (vers[2] == '1' && (vers[3] == '9' || vers[3] == '8' || vers[3] == '7' || vers[3] == '6' ||
+                                    vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' ||
+                                    vers[3] == '1' || vers[3] == '0')) ||
+                (vers[2] == '0' && vers[3] == '9'))
+
+            {
+                NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found quic.\n");
+                ndpi_int_quic_add_connection(ndpi_struct, flow);
+            }
+        } else
+        {
+            NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n");
+            NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC);
+        }
+     }
+}
+#endif