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toxcore/toxcore/TCP_client.c
irungentoo efea858c91
Make it possible to port clients to the new api by just replacing 
proxy_enabled with proxy_type.
2014-12-26 20:33:34 -05:00

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/*
* TCP_client.c -- Implementation of the TCP relay client part of Tox.
*
* Copyright (C) 2014 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Tox 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "TCP_client.h"
#if !defined(_WIN32) && !defined(__WIN32__) && !defined (WIN32)
#include <sys/ioctl.h>
#endif
#include "util.h"
/* return 1 on success
* return 0 on failure
*/
static int connect_sock_to(sock_t sock, IP_Port ip_port, TCP_Proxy_Info *proxy_info)
{
if (proxy_info->proxy_type != TCP_PROXY_NONE) {
ip_port = proxy_info->ip_port;
}
struct sockaddr_storage addr = {0};
size_t addrsize;
if (ip_port.ip.family == AF_INET) {
struct sockaddr_in *addr4 = (struct sockaddr_in *)&addr;
addrsize = sizeof(struct sockaddr_in);
addr4->sin_family = AF_INET;
addr4->sin_addr = ip_port.ip.ip4.in_addr;
addr4->sin_port = ip_port.port;
} else if (ip_port.ip.family == AF_INET6) {
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&addr;
addrsize = sizeof(struct sockaddr_in6);
addr6->sin6_family = AF_INET6;
addr6->sin6_addr = ip_port.ip.ip6.in6_addr;
addr6->sin6_port = ip_port.port;
} else {
return 0;
}
/* nonblocking socket, connect will never return success */
connect(sock, (struct sockaddr *)&addr, addrsize);
return 1;
}
/* return 1 on success.
* return 0 on failure.
*/
static int proxy_http_generate_connection_request(TCP_Client_Connection *TCP_conn)
{
char one[] = "CONNECT ";
char two[] = " HTTP/1.1\nHost: ";
char three[] = "\r\n\r\n";
char ip[INET6_ADDRSTRLEN];
if (!ip_parse_addr(&TCP_conn->ip_port.ip, ip, sizeof(ip))) {
return 0;
}
const uint16_t port = ntohs(TCP_conn->ip_port.port);
const int written = snprintf((char *)TCP_conn->last_packet, MAX_PACKET_SIZE, "%s%s:%hu%s%s:%hu%s", one, ip, port, two,
ip, port, three);
if (written < 0) {
return 0;
}
TCP_conn->last_packet_length = written;
TCP_conn->last_packet_sent = 0;
return 1;
}
/* return 1 on success.
* return 0 if no data received.
* return -1 on failure (connection refused).
*/
static int proxy_http_read_connection_response(TCP_Client_Connection *TCP_conn)
{
char success[] = "200";
uint8_t data[16]; // draining works the best if the length is a power of 2
int ret = read_TCP_packet(TCP_conn->sock, data, sizeof(data) - 1);
if (ret == -1) {
return 0;
}
data[sizeof(data) - 1] = 0;
if (strstr((char *)data, success)) {
// drain all data
unsigned int data_left = TCP_socket_data_recv_buffer(TCP_conn->sock);
if (data_left) {
uint8_t temp_data[data_left];
read_TCP_packet(TCP_conn->sock, temp_data, data_left);
}
return 1;
}
return -1;
}
static void proxy_socks5_generate_handshake(TCP_Client_Connection *TCP_conn)
{
TCP_conn->last_packet[0] = 5; /* SOCKSv5 */
TCP_conn->last_packet[1] = 1; /* number of authentication methods supported */
TCP_conn->last_packet[2] = 0; /* No authentication */
TCP_conn->last_packet_length = 3;
TCP_conn->last_packet_sent = 0;
}
/* return 1 on success.
* return 0 if no data received.
* return -1 on failure (connection refused).
*/
static int socks5_read_handshake_response(TCP_Client_Connection *TCP_conn)
{
uint8_t data[2];
int ret = read_TCP_packet(TCP_conn->sock, data, sizeof(data));
if (ret == -1)
return 0;
if (data[0] == 5 && data[1] == 0)
return 1;
return -1;
}
static void proxy_socks5_generate_connection_request(TCP_Client_Connection *TCP_conn)
{
TCP_conn->last_packet[0] = 5; /* SOCKSv5 */
TCP_conn->last_packet[1] = 1; /* command code: establish a TCP/IP stream connection */
TCP_conn->last_packet[2] = 0; /* reserved, must be 0 */
uint16_t length = 3;
if (TCP_conn->ip_port.ip.family == AF_INET) {
TCP_conn->last_packet[3] = 1; /* IPv4 address */
++length;
memcpy(TCP_conn->last_packet + length, TCP_conn->ip_port.ip.ip4.uint8, sizeof(IP4));
length += sizeof(IP4);
} else {
TCP_conn->last_packet[3] = 4; /* IPv6 address */
++length;
memcpy(TCP_conn->last_packet + length, TCP_conn->ip_port.ip.ip6.uint8, sizeof(IP6));
length += sizeof(IP6);
}
memcpy(TCP_conn->last_packet + length, &TCP_conn->ip_port.port, sizeof(uint16_t));
length += sizeof(uint16_t);
TCP_conn->last_packet_length = length;
TCP_conn->last_packet_sent = 0;
}
/* return 1 on success.
* return 0 if no data received.
* return -1 on failure (connection refused).
*/
static int proxy_socks5_read_connection_response(TCP_Client_Connection *TCP_conn)
{
if (TCP_conn->ip_port.ip.family == AF_INET) {
uint8_t data[4 + sizeof(IP4) + sizeof(uint16_t)];
int ret = read_TCP_packet(TCP_conn->sock, data, sizeof(data));
if (ret == -1)
return 0;
if (data[0] == 5 && data[1] == 0)
return 1;
} else {
uint8_t data[4 + sizeof(IP6) + sizeof(uint16_t)];
int ret = read_TCP_packet(TCP_conn->sock, data, sizeof(data));
if (ret == -1)
return 0;
if (data[0] == 5 && data[1] == 0)
return 1;
}
return -1;
}
/* return 0 on success.
* return -1 on failure.
*/
static int generate_handshake(TCP_Client_Connection *TCP_conn)
{
uint8_t plain[crypto_box_PUBLICKEYBYTES + crypto_box_NONCEBYTES];
crypto_box_keypair(plain, TCP_conn->temp_secret_key);
random_nonce(TCP_conn->sent_nonce);
memcpy(plain + crypto_box_PUBLICKEYBYTES, TCP_conn->sent_nonce, crypto_box_NONCEBYTES);
memcpy(TCP_conn->last_packet, TCP_conn->self_public_key, crypto_box_PUBLICKEYBYTES);
new_nonce(TCP_conn->last_packet + crypto_box_PUBLICKEYBYTES);
int len = encrypt_data_symmetric(TCP_conn->shared_key, TCP_conn->last_packet + crypto_box_PUBLICKEYBYTES, plain,
sizeof(plain), TCP_conn->last_packet + crypto_box_PUBLICKEYBYTES + crypto_box_NONCEBYTES);
if (len != sizeof(plain) + crypto_box_MACBYTES)
return -1;
TCP_conn->last_packet_length = crypto_box_PUBLICKEYBYTES + crypto_box_NONCEBYTES + sizeof(plain) + crypto_box_MACBYTES;
TCP_conn->last_packet_sent = 0;
return 0;
}
/* data must be of length TCP_SERVER_HANDSHAKE_SIZE
*
* return 0 on success.
* return -1 on failure.
*/
static int handle_handshake(TCP_Client_Connection *TCP_conn, const uint8_t *data)
{
uint8_t plain[crypto_box_PUBLICKEYBYTES + crypto_box_NONCEBYTES];
int len = decrypt_data_symmetric(TCP_conn->shared_key, data, data + crypto_box_NONCEBYTES,
TCP_SERVER_HANDSHAKE_SIZE - crypto_box_NONCEBYTES, plain);
if (len != sizeof(plain))
return -1;
memcpy(TCP_conn->recv_nonce, plain + crypto_box_PUBLICKEYBYTES, crypto_box_NONCEBYTES);
encrypt_precompute(plain, TCP_conn->temp_secret_key, TCP_conn->shared_key);
memset(TCP_conn->temp_secret_key, 0, crypto_box_SECRETKEYBYTES);
return 0;
}
/* return 0 if pending data was sent completely
* return -1 if it wasn't
*/
static int send_pending_data_nonpriority(TCP_Client_Connection *con)
{
if (con->last_packet_length == 0) {
return 0;
}
uint16_t left = con->last_packet_length - con->last_packet_sent;
int len = send(con->sock, con->last_packet + con->last_packet_sent, left, MSG_NOSIGNAL);
if (len <= 0)
return -1;
if (len == left) {
con->last_packet_length = 0;
con->last_packet_sent = 0;
return 0;
}
con->last_packet_sent += len;
return -1;
}
/* return 0 if pending data was sent completely
* return -1 if it wasn't
*/
static int send_pending_data(TCP_Client_Connection *con)
{
/* finish sending current non-priority packet */
if (send_pending_data_nonpriority(con) == -1) {
return -1;
}
TCP_Priority_List *p = con->priority_queue_start;
while (p) {
uint16_t left = p->size - p->sent;
int len = send(con->sock, p->data + p->sent, left, MSG_NOSIGNAL);
if (len != left) {
if (len > 0) {
p->sent += len;
}
break;
}
TCP_Priority_List *pp = p;
p = p->next;
free(pp);
}
con->priority_queue_start = p;
if (!p) {
con->priority_queue_end = NULL;
return 0;
}
return -1;
}
/* return 0 on failure (only if malloc fails)
* return 1 on success
*/
static _Bool add_priority(TCP_Client_Connection *con, const uint8_t *packet, uint16_t size, uint16_t sent)
{
TCP_Priority_List *p = con->priority_queue_end, *new;
new = malloc(sizeof(TCP_Priority_List) + size);
if (!new) {
return 0;
}
new->next = NULL;
new->size = size;
new->sent = sent;
memcpy(new->data, packet, size);
if (p) {
p->next = new;
} else {
con->priority_queue_start = new;
}
con->priority_queue_end = new;
return 1;
}
/* return 1 on success.
* return 0 if could not send packet.
* return -1 on failure (connection must be killed).
*/
static int write_packet_TCP_secure_connection(TCP_Client_Connection *con, const uint8_t *data, uint16_t length,
_Bool priority)
{
if (length + crypto_box_MACBYTES > MAX_PACKET_SIZE)
return -1;
_Bool sendpriority = 1;
if (send_pending_data(con) == -1) {
if (priority) {
sendpriority = 0;
} else {
return 0;
}
}
uint8_t packet[sizeof(uint16_t) + length + crypto_box_MACBYTES];
uint16_t c_length = htons(length + crypto_box_MACBYTES);
memcpy(packet, &c_length, sizeof(uint16_t));
int len = encrypt_data_symmetric(con->shared_key, con->sent_nonce, data, length, packet + sizeof(uint16_t));
if ((unsigned int)len != (sizeof(packet) - sizeof(uint16_t)))
return -1;
if (priority) {
len = sendpriority ? send(con->sock, packet, sizeof(packet), MSG_NOSIGNAL) : 0;
if (len <= 0) {
len = 0;
}
increment_nonce(con->sent_nonce);
if ((unsigned int)len == sizeof(packet)) {
return 1;
}
return add_priority(con, packet, sizeof(packet), len);
}
len = send(con->sock, packet, sizeof(packet), MSG_NOSIGNAL);
if (len <= 0)
return 0;
increment_nonce(con->sent_nonce);
if ((unsigned int)len == sizeof(packet))
return 1;
memcpy(con->last_packet, packet, sizeof(packet));
con->last_packet_length = sizeof(packet);
con->last_packet_sent = len;
return 1;
}
/* return 1 on success.
* return 0 if could not send packet.
* return -1 on failure (connection must be killed).
*/
int send_routing_request(TCP_Client_Connection *con, uint8_t *public_key)
{
uint8_t packet[1 + crypto_box_PUBLICKEYBYTES];
packet[0] = TCP_PACKET_ROUTING_REQUEST;
memcpy(packet + 1, public_key, crypto_box_PUBLICKEYBYTES);
return write_packet_TCP_secure_connection(con, packet, sizeof(packet), 1);
}
void routing_response_handler(TCP_Client_Connection *con, int (*response_callback)(void *object, uint8_t connection_id,
const uint8_t *public_key), void *object)
{
con->response_callback = response_callback;
con->response_callback_object = object;
}
void routing_status_handler(TCP_Client_Connection *con, int (*status_callback)(void *object, uint32_t number,
uint8_t connection_id, uint8_t status), void *object)
{
con->status_callback = status_callback;
con->status_callback_object = object;
}
static int send_ping_response(TCP_Client_Connection *con);
static int send_ping_request(TCP_Client_Connection *con);
/* return 1 on success.
* return 0 if could not send packet.
* return -1 on failure.
*/
int send_data(TCP_Client_Connection *con, uint8_t con_id, const uint8_t *data, uint16_t length)
{
if (con_id >= NUM_CLIENT_CONNECTIONS)
return -1;
if (con->connections[con_id].status != 2)
return -1;
if (send_ping_response(con) == 0 || send_ping_request(con) == 0)
return 0;
uint8_t packet[1 + length];
packet[0] = con_id + NUM_RESERVED_PORTS;
memcpy(packet + 1, data, length);
return write_packet_TCP_secure_connection(con, packet, sizeof(packet), 0);
}
/* return 1 on success.
* return 0 if could not send packet.
* return -1 on failure.
*/
int send_oob_packet(TCP_Client_Connection *con, const uint8_t *public_key, const uint8_t *data, uint16_t length)
{
if (length == 0 || length > TCP_MAX_OOB_DATA_LENGTH)
return -1;
uint8_t packet[1 + crypto_box_PUBLICKEYBYTES + length];
packet[0] = TCP_PACKET_OOB_SEND;
memcpy(packet + 1, public_key, crypto_box_PUBLICKEYBYTES);
memcpy(packet + 1 + crypto_box_PUBLICKEYBYTES, data, length);
return write_packet_TCP_secure_connection(con, packet, sizeof(packet), 0);
}
/* Set the number that will be used as an argument in the callbacks related to con_id.
*
* When not set by this function, the number is ~0.
*
* return 0 on success.
* return -1 on failure.
*/
int set_tcp_connection_number(TCP_Client_Connection *con, uint8_t con_id, uint32_t number)
{
if (con_id >= NUM_CLIENT_CONNECTIONS)
return -1;
if (con->connections[con_id].status == 0)
return -1;
con->connections[con_id].number = number;
return 0;
}
void routing_data_handler(TCP_Client_Connection *con, int (*data_callback)(void *object, uint32_t number,
uint8_t connection_id, const uint8_t *data, uint16_t length), void *object)
{
con->data_callback = data_callback;
con->data_callback_object = object;
}
void oob_data_handler(TCP_Client_Connection *con, int (*oob_data_callback)(void *object, const uint8_t *public_key,
const uint8_t *data, uint16_t length), void *object)
{
con->oob_data_callback = oob_data_callback;
con->oob_data_callback_object = object;
}
/* return 1 on success.
* return 0 if could not send packet.
* return -1 on failure (connection must be killed).
*/
static int send_disconnect_notification(TCP_Client_Connection *con, uint8_t id)
{
uint8_t packet[1 + 1];
packet[0] = TCP_PACKET_DISCONNECT_NOTIFICATION;
packet[1] = id;
return write_packet_TCP_secure_connection(con, packet, sizeof(packet), 1);
}
/* return 1 on success.
* return 0 if could not send packet.
* return -1 on failure (connection must be killed).
*/
static int send_ping_request(TCP_Client_Connection *con)
{
if (!con->ping_request_id)
return 1;
uint8_t packet[1 + sizeof(uint64_t)];
packet[0] = TCP_PACKET_PING;
memcpy(packet + 1, &con->ping_request_id, sizeof(uint64_t));
int ret;
if ((ret = write_packet_TCP_secure_connection(con, packet, sizeof(packet), 1)) == 1) {
con->ping_request_id = 0;
}
return ret;
}
/* return 1 on success.
* return 0 if could not send packet.
* return -1 on failure (connection must be killed).
*/
static int send_ping_response(TCP_Client_Connection *con)
{
if (!con->ping_response_id)
return 1;
uint8_t packet[1 + sizeof(uint64_t)];
packet[0] = TCP_PACKET_PONG;
memcpy(packet + 1, &con->ping_response_id, sizeof(uint64_t));
int ret;
if ((ret = write_packet_TCP_secure_connection(con, packet, sizeof(packet), 1)) == 1) {
con->ping_response_id = 0;
}
return ret;
}
/* return 1 on success.
* return 0 if could not send packet.
* return -1 on failure (connection must be killed).
*/
int send_disconnect_request(TCP_Client_Connection *con, uint8_t con_id)
{
if (con_id >= NUM_CLIENT_CONNECTIONS)
return -1;
con->connections[con_id].status = 0;
con->connections[con_id].number = 0;
return send_disconnect_notification(con, con_id + NUM_RESERVED_PORTS);
}
/* return 1 on success.
* return 0 if could not send packet.
* return -1 on failure (connection must be killed).
*/
int send_onion_request(TCP_Client_Connection *con, const uint8_t *data, uint16_t length)
{
uint8_t packet[1 + length];
packet[0] = TCP_PACKET_ONION_REQUEST;
memcpy(packet + 1, data, length);
return write_packet_TCP_secure_connection(con, packet, sizeof(packet), 0);
}
void onion_response_handler(TCP_Client_Connection *con, int (*onion_callback)(void *object, const uint8_t *data,
uint16_t length), void *object)
{
con->onion_callback = onion_callback;
con->onion_callback_object = object;
}
/* Create new TCP connection to ip_port/public_key
*/
TCP_Client_Connection *new_TCP_connection(IP_Port ip_port, const uint8_t *public_key, const uint8_t *self_public_key,
const uint8_t *self_secret_key, TCP_Proxy_Info *proxy_info)
{
if (networking_at_startup() != 0) {
return NULL;
}
if (ip_port.ip.family != AF_INET && ip_port.ip.family != AF_INET6)
return NULL;
uint8_t family = ip_port.ip.family;
TCP_Proxy_Info default_proxyinfo;
if (proxy_info == NULL) {
default_proxyinfo.proxy_type = TCP_PROXY_NONE;
proxy_info = &default_proxyinfo;
}
if (proxy_info->proxy_type != TCP_PROXY_NONE) {
family = proxy_info->ip_port.ip.family;
}
sock_t sock = socket(family, SOCK_STREAM, IPPROTO_TCP);
if (!sock_valid(sock)) {
return NULL;
}
if (!set_socket_nosigpipe(sock)) {
kill_sock(sock);
return 0;
}
if (!(set_socket_nonblock(sock) && connect_sock_to(sock, ip_port, proxy_info))) {
kill_sock(sock);
return NULL;
}
TCP_Client_Connection *temp = calloc(sizeof(TCP_Client_Connection), 1);
if (temp == NULL) {
kill_sock(sock);
return NULL;
}
temp->sock = sock;
memcpy(temp->public_key, public_key, crypto_box_PUBLICKEYBYTES);
memcpy(temp->self_public_key, self_public_key, crypto_box_PUBLICKEYBYTES);
encrypt_precompute(temp->public_key, self_secret_key, temp->shared_key);
temp->ip_port = ip_port;
temp->proxy_info = *proxy_info;
switch (proxy_info->proxy_type) {
case TCP_PROXY_HTTP:
temp->status = TCP_CLIENT_PROXY_HTTP_CONNECTING;
proxy_http_generate_connection_request(temp);
break;
case TCP_PROXY_SOCKS5:
temp->status = TCP_CLIENT_PROXY_SOCKS5_CONNECTING;
proxy_socks5_generate_handshake(temp);
break;
case TCP_PROXY_NONE:
temp->status = TCP_CLIENT_CONNECTING;
if (generate_handshake(temp) == -1) {
kill_sock(sock);
free(temp);
return NULL;
}
break;
}
temp->kill_at = unix_time() + TCP_CONNECTION_TIMEOUT;
return temp;
}
/* return 0 on success
* return -1 on failure
*/
static int handle_TCP_packet(TCP_Client_Connection *conn, const uint8_t *data, uint16_t length)
{
if (length <= 1)
return -1;
switch (data[0]) {
case TCP_PACKET_ROUTING_RESPONSE: {
if (length != 1 + 1 + crypto_box_PUBLICKEYBYTES)
return -1;
if (data[1] < NUM_RESERVED_PORTS)
return 0;
uint8_t con_id = data[1] - NUM_RESERVED_PORTS;
if (conn->connections[con_id].status != 0)
return 0;
conn->connections[con_id].status = 1;
conn->connections[con_id].number = ~0;
memcpy(conn->connections[con_id].public_key, data + 2, crypto_box_PUBLICKEYBYTES);
if (conn->response_callback)
conn->response_callback(conn->response_callback_object, con_id, conn->connections[con_id].public_key);
return 0;
}
case TCP_PACKET_CONNECTION_NOTIFICATION: {
if (length != 1 + 1)
return -1;
if (data[1] < NUM_RESERVED_PORTS)
return -1;
uint8_t con_id = data[1] - NUM_RESERVED_PORTS;
if (conn->connections[con_id].status != 1)
return 0;
conn->connections[con_id].status = 2;
if (conn->status_callback)
conn->status_callback(conn->status_callback_object, conn->connections[con_id].number, con_id,
conn->connections[con_id].status);
return 0;
}
case TCP_PACKET_DISCONNECT_NOTIFICATION: {
if (length != 1 + 1)
return -1;
if (data[1] < NUM_RESERVED_PORTS)
return -1;
uint8_t con_id = data[1] - NUM_RESERVED_PORTS;
if (conn->connections[con_id].status == 0)
return 0;
if (conn->connections[con_id].status != 2)
return 0;
conn->connections[con_id].status = 1;
if (conn->status_callback)
conn->status_callback(conn->status_callback_object, conn->connections[con_id].number, con_id,
conn->connections[con_id].status);
return 0;
}
case TCP_PACKET_PING: {
if (length != 1 + sizeof(uint64_t))
return -1;
uint64_t ping_id;
memcpy(&ping_id, data + 1, sizeof(uint64_t));
conn->ping_response_id = ping_id;
send_ping_response(conn);
return 0;
}
case TCP_PACKET_PONG: {
if (length != 1 + sizeof(uint64_t))
return -1;
uint64_t ping_id;
memcpy(&ping_id, data + 1, sizeof(uint64_t));
if (ping_id) {
if (ping_id == conn->ping_id) {
conn->ping_id = 0;
}
return 0;
} else {
return -1;
}
}
case TCP_PACKET_OOB_RECV: {
if (length <= 1 + crypto_box_PUBLICKEYBYTES)
return -1;
if (conn->oob_data_callback)
conn->oob_data_callback(conn->oob_data_callback_object, data + 1, data + 1 + crypto_box_PUBLICKEYBYTES,
length - (1 + crypto_box_PUBLICKEYBYTES));
return 0;
}
case TCP_PACKET_ONION_RESPONSE: {
conn->onion_callback(conn->onion_callback_object, data + 1, length - 1);
return 0;
}
default: {
if (data[0] < NUM_RESERVED_PORTS)
return -1;
uint8_t con_id = data[0] - NUM_RESERVED_PORTS;
if (conn->data_callback)
conn->data_callback(conn->data_callback_object, conn->connections[con_id].number, con_id, data + 1, length - 1);
}
}
return 0;
}
static int do_confirmed_TCP(TCP_Client_Connection *conn)
{
send_pending_data(conn);
send_ping_response(conn);
send_ping_request(conn);
uint8_t packet[MAX_PACKET_SIZE];
int len;
if (is_timeout(conn->last_pinged, TCP_PING_FREQUENCY)) {
uint64_t ping_id = random_64b();
if (!ping_id)
++ping_id;
conn->ping_request_id = conn->ping_id = ping_id;
send_ping_request(conn);
conn->last_pinged = unix_time();
}
if (conn->ping_id && is_timeout(conn->last_pinged, TCP_PING_TIMEOUT)) {
conn->status = TCP_CLIENT_DISCONNECTED;
return 0;
}
while ((len = read_packet_TCP_secure_connection(conn->sock, &conn->next_packet_length, conn->shared_key,
conn->recv_nonce, packet, sizeof(packet)))) {
if (len == -1) {
conn->status = TCP_CLIENT_DISCONNECTED;
break;
}
if (handle_TCP_packet(conn, packet, len) == -1) {
conn->status = TCP_CLIENT_DISCONNECTED;
break;
}
}
return 0;
}
/* Run the TCP connection
*/
void do_TCP_connection(TCP_Client_Connection *TCP_connection)
{
unix_time_update();
if (TCP_connection->status == TCP_CLIENT_DISCONNECTED) {
return;
}
if (TCP_connection->status == TCP_CLIENT_PROXY_HTTP_CONNECTING) {
if (send_pending_data(TCP_connection) == 0) {
int ret = proxy_http_read_connection_response(TCP_connection);
if (ret == -1) {
TCP_connection->kill_at = 0;
TCP_connection->status = TCP_CLIENT_DISCONNECTED;
}
if (ret == 1) {
generate_handshake(TCP_connection);
TCP_connection->status = TCP_CLIENT_CONNECTING;
}
}
}
if (TCP_connection->status == TCP_CLIENT_PROXY_SOCKS5_CONNECTING) {
if (send_pending_data(TCP_connection) == 0) {
int ret = socks5_read_handshake_response(TCP_connection);
if (ret == -1) {
TCP_connection->kill_at = 0;
TCP_connection->status = TCP_CLIENT_DISCONNECTED;
}
if (ret == 1) {
proxy_socks5_generate_connection_request(TCP_connection);
TCP_connection->status = TCP_CLIENT_PROXY_SOCKS5_UNCONFIRMED;
}
}
}
if (TCP_connection->status == TCP_CLIENT_PROXY_SOCKS5_UNCONFIRMED) {
if (send_pending_data(TCP_connection) == 0) {
int ret = proxy_socks5_read_connection_response(TCP_connection);
if (ret == -1) {
TCP_connection->kill_at = 0;
TCP_connection->status = TCP_CLIENT_DISCONNECTED;
}
if (ret == 1) {
generate_handshake(TCP_connection);
TCP_connection->status = TCP_CLIENT_CONNECTING;
}
}
}
if (TCP_connection->status == TCP_CLIENT_CONNECTING) {
if (send_pending_data(TCP_connection) == 0) {
TCP_connection->status = TCP_CLIENT_UNCONFIRMED;
}
}
if (TCP_connection->status == TCP_CLIENT_UNCONFIRMED) {
uint8_t data[TCP_SERVER_HANDSHAKE_SIZE];
int len = read_TCP_packet(TCP_connection->sock, data, sizeof(data));
if (sizeof(data) == len) {
if (handle_handshake(TCP_connection, data) == 0) {
TCP_connection->kill_at = ~0;
TCP_connection->status = TCP_CLIENT_CONFIRMED;
} else {
TCP_connection->kill_at = 0;
TCP_connection->status = TCP_CLIENT_DISCONNECTED;
}
}
}
if (TCP_connection->status == TCP_CLIENT_CONFIRMED) {
do_confirmed_TCP(TCP_connection);
}
if (TCP_connection->kill_at <= unix_time()) {
TCP_connection->status = TCP_CLIENT_DISCONNECTED;
}
}
/* Kill the TCP connection
*/
void kill_TCP_connection(TCP_Client_Connection *TCP_connection)
{
if (TCP_connection == NULL)
return;
kill_sock(TCP_connection->sock);
memset(TCP_connection, 0, sizeof(TCP_Client_Connection));
free(TCP_connection);
}
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