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#include <ccan/io/io.h>
#include <ccan/short_types/short_types.h>
#include <ccan/tal/str/str.h>
#include <common/status.h>
#include <common/utils.h>
#include <common/wireaddr.h>
#include <connectd/connect.h>
#include <connectd/tor.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#define SOCKS_NOAUTH 0
#define SOCKS_ERROR 0xff
#define SOCKS_CONNECT 1
#define SOCKS_TYP_IPV4 1
#define SOCKS_DOMAIN 3
#define SOCKS_TYP_IPV6 4
#define SOCKS_V5 5
#define MAX_SIZE_OF_SOCKS5_REQ_OR_RESP 255
#define SIZE_OF_RESPONSE 4
#define SIZE_OF_REQUEST 3
#define SIZE_OF_IPV4_RESPONSE 6
#define SIZE_OF_IPV6_RESPONSE 18
#define SOCK_REQ_METH_LEN 3
#define SOCK_REQ_V5_LEN 5
#define SOCK_REQ_V5_HEADER_LEN 7
/* some crufts can not forward ipv6*/
#undef BIND_FIRST_TO_IPV6
struct reaching_socks {
u8 buffer[MAX_SIZE_OF_SOCKS5_REQ_OR_RESP];
size_t hlen;
in_port_t port;
char *host;
struct reaching *reach;
};
static struct io_plan *connect_finish2(struct io_conn *conn,
struct reaching_socks *reach)
{
status_io(LOG_IO_IN, "proxy",
(reach->buffer + SIZE_OF_RESPONSE - SIZE_OF_IPV4_RESPONSE),
SIZE_OF_IPV6_RESPONSE - SIZE_OF_RESPONSE - SIZE_OF_IPV4_RESPONSE);
status_trace("Now try LN connect out for host %s", reach->host);
return connection_out(conn, reach->reach);
}
static struct io_plan *connect_finish(struct io_conn *conn,
struct reaching_socks *reach)
{
status_io(LOG_IO_IN, "proxy",
reach->buffer, SIZE_OF_IPV4_RESPONSE + SIZE_OF_RESPONSE);
if ( reach->buffer[1] == '\0') {
if ( reach->buffer[3] == SOCKS_TYP_IPV6) {
return io_read(conn,
(reach->buffer + SIZE_OF_RESPONSE -
SIZE_OF_IPV4_RESPONSE),
SIZE_OF_IPV6_RESPONSE -
SIZE_OF_RESPONSE - SIZE_OF_IPV4_RESPONSE,
&connect_finish2, reach);
} else if ( reach->buffer[3] == SOCKS_TYP_IPV4) {
status_trace("Now try LN connect out for host %s",
reach->host);
return connection_out(conn, reach->reach);
} else {
status_trace
("Tor connect out for host %s error invalid type return ",
reach->host);
return io_close(conn);
}
} else {
status_trace("Tor connect out for host %s error: %x ",
reach->host, reach->buffer[1]);
return io_close(conn);
}
}
/* called when TOR responds */
static struct io_plan *connect_out(struct io_conn *conn,
struct reaching_socks *reach)
{
return io_read(conn, reach->buffer,
SIZE_OF_IPV4_RESPONSE + SIZE_OF_RESPONSE,
&connect_finish, reach);
}
static struct io_plan *io_tor_connect_after_resp_to_connect(struct io_conn
*conn,
struct
reaching_socks
*reach)
{
status_io(LOG_IO_IN, "proxy", reach->buffer, 2);
if (reach->buffer[1] == SOCKS_ERROR) {
status_trace("Connected out for %s error", reach->host);
return io_close(conn);
}
/* make the V5 request */
reach->hlen = strlen(reach->host);
reach->buffer[0] = SOCKS_V5;
reach->buffer[1] = SOCKS_CONNECT;
reach->buffer[2] = 0;
reach->buffer[3] = SOCKS_DOMAIN;
reach->buffer[4] = reach->hlen;
memcpy(reach->buffer + SOCK_REQ_V5_LEN, reach->host, reach->hlen);
memcpy(reach->buffer + SOCK_REQ_V5_LEN + strlen(reach->host),
&(reach->port), sizeof reach->port);
status_io(LOG_IO_OUT, "proxy", reach->buffer,
SOCK_REQ_V5_HEADER_LEN + reach->hlen);
return io_write(conn, reach->buffer,
SOCK_REQ_V5_HEADER_LEN + reach->hlen,
connect_out, reach);
}
static struct io_plan *io_tor_connect_after_req_to_connect(struct io_conn *conn,
struct reaching_socks
*reach)
{
return io_read(conn, reach->buffer, 2,
&io_tor_connect_after_resp_to_connect, reach);
}
static struct io_plan *io_tor_connect_do_req(struct io_conn *conn,
struct reaching_socks *reach)
{
/* make the init request */
reach->buffer[0] = SOCKS_V5;
reach->buffer[1] = 1;
reach->buffer[2] = SOCKS_NOAUTH;
status_io(LOG_IO_OUT, "proxy", reach->buffer, SOCK_REQ_METH_LEN);
return io_write(conn, reach->buffer, SOCK_REQ_METH_LEN,
&io_tor_connect_after_req_to_connect, reach);
}
// called when we want to connect to TOR SOCKS5
struct io_plan *io_tor_connect(struct io_conn *conn,
const struct addrinfo *tor_proxyaddr,
const char *host, u16 port,
struct reaching *reach)
{
struct reaching_socks *reach_tor = tal(reach, struct reaching_socks);
reach_tor->port = htons(port);
reach_tor->host = tal_strdup(reach_tor, host);
reach_tor->reach = reach;
return io_connect(conn, tor_proxyaddr,
&io_tor_connect_do_req, reach_tor);
}