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-rw-r--r--src/lib/protocols/quic.c182
1 files changed, 88 insertions, 94 deletions
diff --git a/src/lib/protocols/quic.c b/src/lib/protocols/quic.c
index 3180ef28b..d363760b7 100644
--- a/src/lib/protocols/quic.c
+++ b/src/lib/protocols/quic.c
@@ -23,21 +23,21 @@
#include "ndpi_api.h"
-#define QUIC_NO_V_RES_RSV 0xC3 // 1100 0011
+#define QUIC_NO_V_RES_RSV 0xC3
-#define QUIC_CID_MASK 0x0C // 0000 1100
-#define QUIC_VER_MASK 0x01 // 0000 0001
-#define QUIC_SEQ_MASK 0x30 // 0011 0000
+#define QUIC_CID_MASK 0x0C
+#define QUIC_VER_MASK 0x01
+#define QUIC_SEQ_MASK 0x30
-#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_LEN_8 0x0C
+#define CID_LEN_4 0x08
+#define CID_LEN_1 0x04
+#define CID_LEN_0 0x00
-#define SEQ_LEN_6 0x30 // 0011 0000
-#define SEQ_LEN_4 0x20 // 0010 0000
-#define SEQ_LEN_2 0x10 // 0001 0000
-#define SEQ_LEN_1 0x00 // 0000 0000
+#define SEQ_LEN_6 0x30
+#define SEQ_LEN_4 0x20
+#define SEQ_LEN_2 0x10
+#define SEQ_LEN_1 0x00
#define SEQ_CONV(ARR) (ARR[0] | ARR[1] | ARR[2] | ARR[3] | ARR[4] | ARR[5] << 8)
@@ -46,118 +46,112 @@
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);
+ ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_QUIC, NDPI_REAL_PROTOCOL);
}
static int connect_id(const unsigned char pflags)
{
- u_int cid_len;
-
- // Check CID length.
- switch (pflags & QUIC_CID_MASK)
+ u_int cid_len;
+
+ switch (pflags & QUIC_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:
- return -1;
+ return -1;
}
- // Return offset.
- return cid_len + 1;
+
+ return cid_len + 1;
}
static int sequence(const unsigned char *payload)
{
- unsigned char conv[6] = {0};
- u_int seq_value = -1;
- int seq_lens;
- int cid_offs;
- int i;
-
- // Search SEQ bytes length.
- switch (payload[0] & QUIC_SEQ_MASK)
+ unsigned char conv[6] = {0};
+ u_int seq_value = -1;
+ int seq_lens;
+ int cid_offs;
+ int i;
+
+ switch (payload[0] & QUIC_SEQ_MASK)
{
case SEQ_LEN_6: seq_lens = 6; break;
case SEQ_LEN_4: seq_lens = 4; break;
case SEQ_LEN_2: seq_lens = 2; break;
case SEQ_LEN_1: seq_lens = 1; break;
default:
- return -1;
+ return -1;
}
- // Retrieve SEQ offset.
- cid_offs = connect_id(payload[0]);
- if (cid_offs >= 0 && seq_lens > 0)
+ cid_offs = connect_id(payload[0]);
+
+ if (cid_offs != -1 && seq_lens > 0)
{
- for (i = 0; i < seq_lens; i++)
- conv[i] = payload[cid_offs + i];
+ for (i = 0; i < seq_lens; i++)
+ conv[i] = payload[cid_offs + i];
- seq_value = SEQ_CONV(conv);
+ seq_value = SEQ_CONV(conv);
}
- // Return SEQ dec value;
- return seq_value;
+
+ return seq_value;
}
void ndpi_search_quic(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
- struct ndpi_packet_struct *packet = &flow->packet;
- int ver_offs;
-
- if(packet->udp != NULL) {
- u_int16_t 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");
-
- if(((packet->payload[0] & 0xF0) != 0)
- || (!(sport == 80 || dport == 80 || sport == 443 || dport == 443)))
- goto exclude_quic;
-
- // Settings without version. First check if PUBLIC FLAGS & SEQ bytes are 0x0. SEQ must be 1 at least.
- if ((packet->payload[0] == 0x00 && packet->payload[1] != 0x00) || ((packet->payload[0] & QUIC_NO_V_RES_RSV) == 0))
- {
- if (sequence(packet->payload) < 1)
- {
-
- 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);
- }
-
- 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)
- {
- // Skip CID length.
- ver_offs = connect_id(packet->payload[0]);
-
- if (ver_offs >= 0){
- unsigned char vers[] = {packet->payload[ver_offs], packet->payload[ver_offs + 1],
- packet->payload[ver_offs + 2], packet->payload[ver_offs + 3]};
-
- // 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
- {
- exclude_quic:
- 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);
- }
- }
+ struct ndpi_packet_struct *packet = &flow->packet;
+ unsigned char *vers;
+ int ver_offs;
+
+ if(packet->udp != NULL)
+ {
+ u_int16_t 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");
+
+ if(((packet->payload[0] & 0xC2) != 0) || (!(sport == 80 || dport == 80 || sport == 443 || dport == 443)))
+ goto exclude_quic;
+
+ /* Quic without version. First check if PUBLIC FLAGS & SEQ bytes are 0x0, SEQ must be greater than zero */
+ if (((packet->payload[0] == 0x00) && (packet->payload[1] != 0x00)) || ((packet->payload[0] & QUIC_NO_V_RES_RSV) == 0))
+ {
+ if (sequence(packet->payload) < 1)
+ {
+ 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);
+ }
+
+ NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found quic.\n");
+ ndpi_int_quic_add_connection(ndpi_struct, flow);
+ }
+
+ else if (packet->payload[0] & QUIC_VER_MASK)
+ {
+ ver_offs = connect_id(packet->payload[0]);
+
+ if (ver_offs != -1){
+ vers = packet->payload + ver_offs;
+
+ 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
+ {
+ exclude_quic:
+ 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
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