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/*
* btlib.h
*
* Copyright (C) 2011-15 - ntop.org
* Contributed by Vitaly Lavrov <vel21ripn@gmail.com>
*
* This file is part of nDPI, an open source deep packet inspection
* library based on the OpenDPI and PACE technology by ipoque GmbH
*
* nDPI 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.
*
* nDPI 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
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#define BDEC_MAXDEPT 8
#ifdef WIN32
#include "ndpi_win32.h"
#endif
typedef struct b_elem_s {
const u_int8_t *s;
size_t l;
} b_elem_s_t;
#ifdef WIN32
// enable 1 byte packing on Windows
#include <pshpack1.h>
#endif
struct
#ifndef WIN32
__attribute__((__packed__))
#endif
bt_nodes_data {
u_int8_t id[20];
u_int32_t ip;
u_int16_t port;
};
struct
#ifndef WIN32
__attribute__((__packed__))
#endif
bt_ipv4p {
u_int32_t ip;
u_int16_t port;
};
struct
#ifndef WIN32
__attribute__((__packed__))
#endif
bt_ipv4p2 {
struct bt_ipv4p d;
u_int8_t pad[2];
};
struct
#ifndef WIN32
__attribute__((__packed__))
#endif
bt_nodes6_data {
u_int8_t id[20];
u_int32_t ip[4];
u_int16_t port;
};
struct
#ifndef WIN32
__attribute__((__packed__))
#endif
bt_ipv6p {
u_int32_t ip[4];
u_int16_t port;
};
struct
#ifndef WIN32
__attribute__((__packed__))
#endif
bt_ipv6p2 {
struct bt_ipv6p d;
u_int8_t pad[3];
};
#ifdef WIN32
// disable 1 byte packing
#include <poppack.h>
#endif
/*
a.id S r.id S
a.info_hash S r.ip ipv4
a.name S r.nodes x(id,ipv4,port)
-a.noseed 0|1 r.n S name of file
a.port N r.p port
-a.scrape 0|1 r.token S
-a.seed 0|1 r.values x(ipv4,port)
a.target S
a.token S -a.vote N
-a.want n4|n6
q announce_peer q find_node
q get_peers q ping
-q vote
ip ipv4+port interval N
min interval N peers x(ipv4,port)
t 2/4/8b v 4/6b
e S y e y r y q
*/
struct bt_parse_protocol {
u_int16_t y_e:1, y_r:1, y_q:1,
q_a_peer:1,q_f_node:1,
q_g_peers:1,q_ping:1,
h_int:1,h_mint:1,h_ip:1;
struct {
const u_int8_t *id, // 20
*info_hash, // 20
*target, // 20
*token, // 20|8
*name; // varlen
u_int16_t name_len;
u_int16_t port;
u_int16_t t_len;
} a;
struct {
const u_int8_t *id, // 20
*token, // 20|8
*values, // (6+2)*x
*values6, // (18_3)*x
*name; // varlen
struct bt_ipv4p *ip;
struct bt_nodes_data *nodes;
struct bt_nodes6_data *nodes6;
u_int16_t name_len;
u_int16_t nn; // nodes num
u_int16_t nv; // values num
u_int16_t nn6; // nodes6 num
u_int16_t nv6; // values6 num
u_int16_t port;
u_int16_t t_len;
} r;
int interval,min_interval;
struct bt_ipv4p *peers;
int n_peers;
struct bt_ipv4p *ip;
const u_int8_t *e_msg;
u_int16_t e_len;
u_int64_t t,v;
};
typedef struct bt_parse_data_cb {
struct bt_parse_protocol p;
char buf[64];
int level;
int t;
union {
int64_t i;
b_elem_s_t s;
} v;
} bt_parse_data_cb_t;
extern int bt_parse_debug;
void dump_bt_proto_struct(struct bt_parse_protocol *p);
const u_int8_t *bt_decode(const u_int8_t *b, size_t *l, int *ret, bt_parse_data_cb_t *cbd);
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