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https://github.com/vel21ripn/nDPI.git
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Update quic.c
Added more SEQ and CID controls.
This commit is contained in:
Andrea Buscarinu
parent
77999ce733
commit
bbb7091a58
1 changed files with 110 additions and 68 deletions
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@ -23,14 +23,26 @@
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#include "ndpi_api.h"
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#define SEQ_CID_MASK_ALL 0x3c // 0011 1100
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#define QUIC_VER_MASK 0x01 // 0000 0001
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#define CID_LEN_8 0x0C // 0000 1100
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#define CID_LEN_4 0x08 // 0000 1000
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#define CID_LEN_1 0x04 // 0000 0100
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#define CID_LEN_0 0x00 // 0000 0000
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#define SEQ_MASK 0xf3 // 1111 0011
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#define CID_MASK 0x0C // 0000 1100
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#define QUIC_NO_V_RES_RSV 0xf3 // 1100 0011
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#define QUIC_CID_MASK 0x0C // 0000 1100
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#define QUIC_VER_MASK 0x01 // 0000 0001
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#define QUIC_SEQ_MASK 0x30 // 0011 0000
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#define CID_LEN_8 0x0C // 0000 1100
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#define CID_LEN_4 0x08 // 0000 1000
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#define CID_LEN_1 0x04 // 0000 0100
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#define CID_LEN_0 0x00 // 0000 0000
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#define SEQ_LEN_6 0x30 // 0011 0000
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#define SEQ_LEN_4 0x20 // 0010 0000
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#define SEQ_LEN_2 0x10 // 0001 0000
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#define SEQ_LEN_1 0x00 // 0000 0000
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#define SEQ_CONV_6(ARR) (ARR[0] | ARR[1] | ARR[2] | ARR[3] | ARR[4] | ARR[5] << 8)
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#define SEQ_CONV_4(ARR) (ARR[0] | ARR[1] | ARR[2] | ARR[3] << 8)
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#define SEQ_CONV_2(ARR) (ARR[0] | ARR[1] << 8)
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#define SEQ_CONV_1(ARR) (ARR[0] << 8)
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#ifdef NDPI_PROTOCOL_QUIC
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@ -40,89 +52,119 @@ static void ndpi_int_quic_add_connection(struct ndpi_detection_module_struct
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ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_QUIC, NDPI_REAL_PROTOCOL);
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}
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int connect_id(const unsigned char pflags)
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{
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u_int cid_len;
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// Check CID length.
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switch (pflags & QUIC_CID_MASK)
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{
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case CID_LEN_8: cid_len = 8; break;
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case CID_LEN_4: cid_len = 4; break;
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case CID_LEN_1: cid_len = 1; break;
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case CID_LEN_0: cid_len = 0; break;
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default:
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return -1;
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}
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// Return offset.
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return cid_len + 1;
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}
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int sequence(const unsigned char *payload)
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{
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unsigned char* conv;
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u_int seq_len;
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u_int cid_offs;
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u_int seq_value;
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int i;
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switch (payload[0] & QUIC_SEQ_MASK)
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{
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case SEQ_LEN_6: seq_len = 6; break;
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case SEQ_LEN_4: seq_len = 4; break;
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case SEQ_LEN_2: seq_len = 2; break;
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case SEQ_LEN_1: seq_len = 1; break;
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default:
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return -1;
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}
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if (seq_len > 0) calloc(seq_len, sizeof(unsigned char));
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cid_offs = connect_id(payload[0]);
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if (cid_offs >= 0)
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{
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for (i = cid_offs; i < seq_len; i++)
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conv[i] = payload[i];
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switch (seq_len)
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{
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case 6: seq_value = SEQ_CONV_6(conv); break;
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case 4: seq_value = SEQ_CONV_4(conv); break;
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case 2: seq_value = SEQ_CONV_2(conv); break;
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case 1: seq_value = SEQ_CONV_1(conv); break;
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default:
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return -1;
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}
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// Return SEQ int value;
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return seq_value;
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}
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}
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void ndpi_search_quic(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
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{
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struct ndpi_packet_struct *packet = &flow->packet;
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u_int16_t dport = 0, sport = 0;
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u_int ver_offs;
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u_int seq_offs;
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u_int cid_len;
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if(packet->udp != NULL) {
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if(packet->udp != NULL) {
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sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
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NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "calculating quic over udp.\n");
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// Settings without version. First check if 0x00 PUBLIC FLAGS and SEQ != 0x00. SEQ must be 1 at least.
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// Settings without version. First check if PUBLIC FLAGS & SEQ bytes are 0x0. SEQ must be 1 at least.
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if ((sport == 80 || dport == 80 || sport == 443 || dport == 443) && ((packet->payload[0] == 0x00 && packet->payload[1] != 0x00) ||
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(packet->payload[0] & SEQ_CID_MASK_ALL)))
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(packet->payload[0] & (QUIC_NO_V_RES_RSV) == 0)))
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{
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// Filter packets with 1 byte SEQ.
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if (packet->payload[0] & SEQ_MASK == 0)
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if (sequence(packet->payload) < 1)
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{
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// Has no version, 1 byte SEQ.
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// Check CID length.
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switch (packet->payload[0] & CID_MASK)
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{
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case CID_LEN_8: cid_len = 8; break;
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case CID_LEN_4: cid_len = 4; break;
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case CID_LEN_1: cid_len = 1; break;
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case CID_LEN_0: cid_len = 0; break;
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default:
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NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n");
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NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC);
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}
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seq_offs = cid_len + 1;
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// SEQ must be 1 at least.
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if(packet->payload[seq_offs] == 0)
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{
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NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n");
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NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC);
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}
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NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n");
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NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC);
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}
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NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found quic.\n");
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ndpi_int_quic_add_connection(ndpi_struct, flow);
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}
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// Check if version, than the CID length.
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} else if (packet->payload[0] & QUIC_VER_MASK)
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else if (packet->payload[0] & QUIC_VER_MASK)
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{
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// Has version, check CID length.
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switch (packet->payload[0] & CID_MASK)
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{
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case CID_LEN_8: cid_len = 8; break;
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case CID_LEN_4: cid_len = 4; break;
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case CID_LEN_1: cid_len = 1; break;
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case CID_LEN_0: cid_len = 0; break;
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default:
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NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n");
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NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC);
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}
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// Skip CID length.
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ver_offs = cid_len + 1;
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unsigned char vers[] = {packet->payload[ver_offs], packet->payload[ver_offs + 1],
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packet->payload[ver_offs + 2], packet->payload[ver_offs + 3]};
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ver_offs = connect_id(packet->payload[0]);
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// Check version match.
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if (vers[0] == 'Q' && vers[1] == '0' &&
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(vers[2] == '2' && (vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' ||
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vers[3] == '1' || vers[3] == '0')) ||
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(vers[2] == '1' && (vers[3] == '9' || vers[3] == '8' || vers[3] == '7' || vers[3] == '6' ||
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vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' ||
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vers[3] == '1' || vers[3] == '0')) ||
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(vers[2] == '0' && vers[3] == '9'))
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if (ver_offs >= 0){
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unsigned char vers[] = {packet->payload[ver_offs], packet->payload[ver_offs + 1],
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packet->payload[ver_offs + 2], packet->payload[ver_offs + 3]};
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{
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NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found quic.\n");
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ndpi_int_quic_add_connection(ndpi_struct, flow);
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}
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} else
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{
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NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n");
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NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC);
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// Version Match.
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if (vers[0] == 'Q' && vers[1] == '0' &&
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(vers[2] == '2' && (vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' ||
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vers[3] == '1' || vers[3] == '0')) ||
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(vers[2] == '1' && (vers[3] == '9' || vers[3] == '8' || vers[3] == '7' || vers[3] == '6' ||
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vers[3] == '5' || vers[3] == '4' || vers[3] == '3' || vers[3] == '2' ||
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vers[3] == '1' || vers[3] == '0')) ||
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(vers[2] == '0' && vers[3] == '9'))
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{
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NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "found quic.\n");
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ndpi_int_quic_add_connection(ndpi_struct, flow);
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}
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}
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} else
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{
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NDPI_LOG(NDPI_PROTOCOL_QUIC, ndpi_struct, NDPI_LOG_DEBUG, "exclude quic.\n");
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NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_QUIC);
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}
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}
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}
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}
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#endif
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