analyzer-d4-pibs/bin/libpibs.c

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/*
* pibs - Passive Identification of BackScatter
*
* Copyright (C) 2019 Gerard Wagener
* Copyright (C) 2019 CIRCL Computer Incident Response Center Luxembourg
* (SMILE gie).
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
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#include "pibs.h"
void process_frame(pibs_t* pibs, wtap *wth,
uint8_t *eth)
{
struct ip* ipv4;
struct tcphdr* tcp;
unsigned char* buf;
size_t length;
buf = eth+14;
length = wth->rec.rec_header.packet_header.caplen-14;
if (length < sizeof(struct ip)) {
return;
}
ipv4 = (struct ip*)buf;
// Focus only on TCP packets
if (ipv4->ip_p != 6)
return;
tcp = (struct tcphdr*)(buf+sizeof(struct ip));
synseen_process_frame(pibs, wth, eth, ipv4, tcp);
//Put other frame processing activities here
}
void process_file(pibs_t* pibs)
{
wtap *wth;
int err;
char *errinfo;
gint64 data_offset;
int ethertype;
guint8 *buf;
fprintf(stderr,"Processing %s\n",pibs->filename);
wth = wtap_open_offline ( pibs->filename, WTAP_TYPE_AUTO, (int*)&err,
(char**)&errinfo, FALSE);
if (wth) {
/* Loop over the packets and adjust the headers */
while (wtap_read(wth, &err, &errinfo, &data_offset)) {
if (wth->rec.rec_type == REC_TYPE_PACKET) {
if (wth->rec.tsprec == WTAP_TSPREC_USEC){
if (wth->rec.rec_header.packet_header.caplen < 14) {
fprintf(stderr,"Packet too small, skip\n");
continue;
}
}
buf = wth->rec_data->data;
ethertype = buf[12] << 8 | buf[13];
// TODO Focus on IPv4 only
if (ethertype == 0x0800) {
process_frame(pibs, wth, buf);
}
}
}
wtap_close(wth);
fprintf(stderr,"[INFO] Processing of filename %s done\n",pibs->filename);
}else{
fprintf(stderr, "[ERROR] Could not open filename %s,cause=%s\n",pibs->filename,
wtap_strerror(err));
}
}
pibs_t* init(void)
{
pibs_t *pibs;
wtap_init(FALSE);
pibs=calloc(sizeof(pibs_t),1);
//TODO error handling
//TODO check if size is correct
pibs->filename = calloc(FILENAME_MAX,1);
pibs->uuid = calloc(SZUUID,1);
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pibs->key = calloc(SZKEY,1);
pibs->server = calloc(SZSERVER,1);
// Initialize the various processors
synseen_init(pibs);
return pibs;
}
void process_redis_list(pibs_t* pibs)
{
redisReply *reply;
int rtype;
snprintf(pibs->key, SZKEY, "analyzer:1:%s",pibs->uuid);
pibs->ctx = redisConnect(pibs->server, pibs->port);
if (pibs->ctx != NULL) {
if (pibs->redisdb >0) {
printf("[INFO] Select redis database %d\n", pibs->redisdb);
reply = redisCommand(pibs->ctx, "SELECT %d", pibs->redisdb);
if (reply) {
rtype = reply->type;
freeReplyObject(reply);
if (rtype != REDIS_REPLY_STATUS) {
printf("[ERROR] Cannot switch to database %d. Abort.",
pibs->redisdb);
return;
}
}
}
do {
reply = redisCommand(pibs->ctx,"RPOP %s", pibs->key);
if (reply) {
rtype = reply->type;
if (rtype == REDIS_REPLY_STRING ) {
printf("#Need to proces file %s\n", reply->str);
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strncpy(pibs->filename, reply->str, FILENAME_MAX);
process_file(pibs);
}
freeReplyObject(reply);
}
} while (rtype != REDIS_REPLY_NIL);
} else {
if (pibs->ctx->errstr) {
fprintf(stderr, "Cannot connect to redis. Cause=%s\n",pibs->ctx->errstr);
}
}
}