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/*
* git.c
*
* Copyright (C) 2012-16 - 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 <stdlib.h>
#include "ndpi_api.h"
#ifdef NDPI_PROTOCOL_GIT
#define GIT_PORT 9418
/* read all the length even if there is a null byte inside */
u_int16_t read_all_len(char * s, u_int16_t git_len)
{
char * p = s;
int c = 0;
while(*p && c < git_len-4) {
c++;
p++;
if(!*p) {
if(c < git_len-4) {
p++;
c++;
}
}
}
return c;
}
void ndpi_search_git(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct * packet = &flow->packet;
const u_int8_t * pp = packet->payload;
u_int16_t payload_len = packet->payload_packet_len;
u_int8_t * git_pkt_len_buff = NULL;
u_int8_t * git_pkt_data = NULL;
u_int16_t git_len = 0, count = 0;
if(packet->tcp != NULL) {
if((ntohs(packet->tcp->source) == GIT_PORT ||
ntohs(packet->tcp->dest) == GIT_PORT)) {
git_pkt_len_buff = malloc(4 * sizeof(u_int8_t));
do {
memcpy(git_pkt_len_buff, pp, 4);
git_len = (int)strtol(git_pkt_len_buff, NULL, 16);
if(git_pkt_len_buff[0] == 48 &&
git_pkt_len_buff[1] == 48 &&
git_pkt_len_buff[2] == 48 &&
git_pkt_len_buff[3] == 48)
/* Terminator packet */
count += 4;
else {
git_pkt_data = malloc((git_len-4) * sizeof(u_int8_t));
memcpy(git_pkt_data, pp+4, git_len-4);
u_int16_t data_len = read_all_len(git_pkt_data, git_len);
free(git_pkt_data);
if(git_len != data_len+4)
goto no_git;
else {
count += git_len;
pp += git_len;
}
}
} while(count < payload_len);
}
else goto no_git;
}
else goto no_git;
NDPI_LOG(NDPI_PROTOCOL_GIT, ndpi_struct, NDPI_LOG_DEBUG, "found Git.\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_GIT, NDPI_PROTOCOL_UNKNOWN);
return;
no_git:
NDPI_LOG(NDPI_PROTOCOL_GIT, ndpi_struct, NDPI_LOG_DEBUG, "exclude Git.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_GIT);
}
/* ***************************************************************** */
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_TCP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
#endif /* NDPI_PROTOCOL_GIT */
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