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/*
* git.c
*
* Copyright (C) 2012-22 - 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_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_GIT
#include "ndpi_api.h"
#define GIT_PORT 9418
void ndpi_search_git(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct * packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search Git\n");
if((packet->tcp != NULL) && (packet->payload_packet_len > 4)) {
if((ntohs(packet->tcp->source) == GIT_PORT)
|| (ntohs(packet->tcp->dest) == GIT_PORT)) {
const u_int8_t * pp = packet->payload;
u_int16_t payload_len = packet->payload_packet_len;
u_int8_t found_git = 1;
u_int16_t offset = 0;
while((offset+4) < payload_len) {
char len[5];
u_int32_t git_pkt_len;
memcpy(&len, &pp[offset], 4), len[4] = 0;
if(sscanf(len, "%x", &git_pkt_len) != 1) {
found_git = 0;
break;
}
if((payload_len < git_pkt_len) || (git_pkt_len == 0 /* Bad */)) {
found_git = 0;
break;
} else
offset += git_pkt_len, payload_len -= git_pkt_len;
}
if(found_git) {
NDPI_LOG_INFO(ndpi_struct, "found Git\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_GIT, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
return;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
/* ***************************************************************** */
void init_git_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id,
NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("Git", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_GIT,
ndpi_search_git,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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