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04b79f91e8
glib/gio/gsocks5proxy.c
Philip Withnall e7aa0039b9
gsocks5proxy: Rework functions to separate length and success/failure 
The previous approach was to return a length as a `gssize`, with
negative values indicating failure. That works fine, but causes a lot of
signed/unsigned comparisons or assignments.

Tidy the code up by splitting success from length, returning success as
a boolean, and length as a `size_t*` out argument. This introduces no
functional changes, but does tidy the code up and fix some compiler
integer warnings.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>
2024-04-25 00:39:13 +01:00

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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2008, 2010 Collabora, Ltd.
* Copyright (C) 2008 Nokia Corporation. All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Youness Alaoui <youness.alaoui@collabora.co.uk
*
* Contributors:
* Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
*/
#include "config.h"
#include "gsocks5proxy.h"
#include <string.h>
#include "giomodule.h"
#include "giomodule-priv.h"
#include "giostream.h"
#include "ginetaddress.h"
#include "ginputstream.h"
#include "glibintl.h"
#include "goutputstream.h"
#include "gproxy.h"
#include "gproxyaddress.h"
#include "gtask.h"
#define SOCKS5_VERSION 0x05
#define SOCKS5_CMD_CONNECT 0x01
#define SOCKS5_CMD_BIND 0x02
#define SOCKS5_CMD_UDP_ASSOCIATE 0x03
#define SOCKS5_ATYP_IPV4 0x01
#define SOCKS5_ATYP_DOMAINNAME 0x03
#define SOCKS5_ATYP_IPV6 0x04
#define SOCKS5_AUTH_VERSION 0x01
#define SOCKS5_AUTH_NONE 0x00
#define SOCKS5_AUTH_GSSAPI 0x01
#define SOCKS5_AUTH_USR_PASS 0x02
#define SOCKS5_AUTH_NO_ACCEPT 0xff
#define SOCKS5_MAX_LEN 255
#define SOCKS5_RESERVED 0x00
#define SOCKS5_REP_SUCCEEDED 0x00
#define SOCKS5_REP_SRV_FAILURE 0x01
#define SOCKS5_REP_NOT_ALLOWED 0x02
#define SOCKS5_REP_NET_UNREACH 0x03
#define SOCKS5_REP_HOST_UNREACH 0x04
#define SOCKS5_REP_REFUSED 0x05
#define SOCKS5_REP_TTL_EXPIRED 0x06
#define SOCKS5_REP_CMD_NOT_SUP 0x07
#define SOCKS5_REP_ATYPE_NOT_SUP 0x08
struct _GSocks5Proxy
{
GObject parent;
};
struct _GSocks5ProxyClass
{
GObjectClass parent_class;
};
static void g_socks5_proxy_iface_init (GProxyInterface *proxy_iface);
#define g_socks5_proxy_get_type _g_socks5_proxy_get_type
G_DEFINE_TYPE_WITH_CODE (GSocks5Proxy, g_socks5_proxy, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_PROXY,
g_socks5_proxy_iface_init)
_g_io_modules_ensure_extension_points_registered ();
g_io_extension_point_implement (G_PROXY_EXTENSION_POINT_NAME,
g_define_type_id,
"socks5",
0))
static void
g_socks5_proxy_finalize (GObject *object)
{
/* must chain up */
G_OBJECT_CLASS (g_socks5_proxy_parent_class)->finalize (object);
}
static void
g_socks5_proxy_init (GSocks5Proxy *proxy)
{
}
/*
* +----+----------+----------+
* |VER | NMETHODS | METHODS |
* +----+----------+----------+
* | 1 | 1 | 1 to 255 |
* +----+----------+----------+
*/
#define SOCKS5_NEGO_MSG_LEN 4
static size_t
set_nego_msg (guint8 *msg, gboolean has_auth)
{
size_t len = 3;
msg[0] = SOCKS5_VERSION;
msg[1] = 0x01; /* number of methods supported */
msg[2] = SOCKS5_AUTH_NONE;
/* add support for authentication method */
if (has_auth)
{
msg[1] = 0x02; /* number of methods supported */
msg[3] = SOCKS5_AUTH_USR_PASS;
len++;
}
return len;
}
/*
* +----+--------+
* |VER | METHOD |
* +----+--------+
* | 1 | 1 |
* +----+--------+
*/
#define SOCKS5_NEGO_REP_LEN 2
static gboolean
parse_nego_reply (const guint8 *data,
gboolean has_auth,
gboolean *must_auth,
GError **error)
{
if (data[0] != SOCKS5_VERSION)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("The server is not a SOCKSv5 proxy server."));
return FALSE;
}
switch (data[1])
{
case SOCKS5_AUTH_NONE:
*must_auth = FALSE;
break;
case SOCKS5_AUTH_USR_PASS:
if (!has_auth)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_NEED_AUTH,
_("The SOCKSv5 proxy requires authentication."));
return FALSE;
}
*must_auth = TRUE;
break;
case SOCKS5_AUTH_NO_ACCEPT:
if (!has_auth)
{
/* The server has said it accepts none of our authentication methods,
* but given the slightly odd implementation of set_nego_msg(), we
* actually only gave it the choice of %SOCKS5_AUTH_NONE, since the
* caller specified no username or password.
* Return %G_IO_ERROR_PROXY_NEED_AUTH so the caller knows that if
* they specify a username and password and try again, authentication
* might succeed (since we’ll send %SOCKS5_AUTH_USR_PASS next time). */
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_NEED_AUTH,
_("The SOCKSv5 proxy requires authentication."));
return FALSE;
}
G_GNUC_FALLTHROUGH;
case SOCKS5_AUTH_GSSAPI:
default:
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_AUTH_FAILED,
_("The SOCKSv5 proxy requires an authentication "
"method that is not supported by GLib."));
return FALSE;
break;
}
return TRUE;
}
#define SOCKS5_AUTH_MSG_LEN 515
static gboolean
set_auth_msg (guint8 *msg,
const gchar *username,
const gchar *password,
size_t *out_len,
GError **error)
{
size_t len = 0;
size_t ulen = 0; /* username length */
size_t plen = 0; /* Password length */
/* Clear output first */
if (out_len != NULL)
*out_len = 0;
if (username)
ulen = strlen (username);
if (password)
plen = strlen (password);
if (ulen > SOCKS5_MAX_LEN || plen > SOCKS5_MAX_LEN)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("Username or password is too long for SOCKSv5 "
"protocol."));
return FALSE;
}
msg[len++] = SOCKS5_AUTH_VERSION;
msg[len++] = ulen;
if (ulen > 0)
memcpy (msg + len, username, ulen);
len += ulen;
msg[len++] = plen;
if (plen > 0)
memcpy (msg + len, password, plen);
len += plen;
if (out_len != NULL)
*out_len = len;
return TRUE;
}
static gboolean
check_auth_status (const guint8 *data, GError **error)
{
if (data[0] != SOCKS5_AUTH_VERSION
|| data[1] != SOCKS5_REP_SUCCEEDED)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_AUTH_FAILED,
_("SOCKSv5 authentication failed due to wrong "
"username or password."));
return FALSE;
}
return TRUE;
}
/*
* +----+-----+-------+------+----------+----------+
* |VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
* +----+-----+-------+------+----------+----------+
* | 1 | 1 | X'00' | 1 | Variable | 2 |
* +----+-----+-------+------+----------+----------+
* DST.ADDR is a string with first byte being the size. So DST.ADDR may not be
* longer then 256 bytes.
*/
#define SOCKS5_CONN_MSG_LEN 262
static gboolean
set_connect_msg (guint8 *msg,
const gchar *hostname,
guint16 port,
size_t *out_len,
GError **error)
{
size_t len = 0;
/* Clear output first */
if (out_len != NULL)
*out_len = 0;
msg[len++] = SOCKS5_VERSION;
msg[len++] = SOCKS5_CMD_CONNECT;
msg[len++] = SOCKS5_RESERVED;
if (g_hostname_is_ip_address (hostname))
{
GInetAddress *addr = g_inet_address_new_from_string (hostname);
gsize addr_len = g_inet_address_get_native_size (addr);
/* We are cheating for simplicity, here's the logic:
* 1 = IPV4 = 4 bytes / 4
* 4 = IPV6 = 16 bytes / 4 */
msg[len++] = addr_len / 4;
memcpy (msg + len, g_inet_address_to_bytes (addr), addr_len);
len += addr_len;
g_object_unref (addr);
}
else
{
gsize host_len = strlen (hostname);
if (host_len > SOCKS5_MAX_LEN)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("Hostname “%s” is too long for SOCKSv5 protocol"),
hostname);
return FALSE;
}
msg[len++] = SOCKS5_ATYP_DOMAINNAME;
msg[len++] = (guint8) host_len;
memcpy (msg + len, hostname, host_len);
len += host_len;
}
{
guint16 hp = g_htons (port);
memcpy (msg + len, &hp, 2);
len += 2;
}
if (out_len != NULL)
*out_len = len;
return TRUE;
}
/*
* +----+-----+-------+------+----------+----------+
* |VER | REP | RSV | ATYP | BND.ADDR | BND.PORT |
* +----+-----+-------+------+----------+----------+
* | 1 | 1 | X'00' | 1 | Variable | 2 |
* +----+-----+-------+------+----------+----------+
* This reply need to be read by small part to determine size. Buffer
* size is determined in function of the biggest part to read.
*
* The parser only requires 4 bytes.
*/
#define SOCKS5_CONN_REP_LEN 257
static gboolean
parse_connect_reply (const guint8 *data, gint *atype, GError **error)
{
if (data[0] != SOCKS5_VERSION)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("The server is not a SOCKSv5 proxy server."));
return FALSE;
}
switch (data[1])
{
case SOCKS5_REP_SUCCEEDED:
if (data[2] != SOCKS5_RESERVED)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("The server is not a SOCKSv5 proxy server."));
return FALSE;
}
switch (data[3])
{
case SOCKS5_ATYP_IPV4:
case SOCKS5_ATYP_IPV6:
case SOCKS5_ATYP_DOMAINNAME:
*atype = data[3];
break;
default:
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("The SOCKSv5 proxy server uses unknown address type."));
return FALSE;
}
break;
case SOCKS5_REP_SRV_FAILURE:
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("Internal SOCKSv5 proxy server error."));
return FALSE;
break;
case SOCKS5_REP_NOT_ALLOWED:
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_NOT_ALLOWED,
_("SOCKSv5 connection not allowed by ruleset."));
return FALSE;
break;
case SOCKS5_REP_TTL_EXPIRED:
case SOCKS5_REP_HOST_UNREACH:
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_HOST_UNREACHABLE,
_("Host unreachable through SOCKSv5 server."));
return FALSE;
break;
case SOCKS5_REP_NET_UNREACH:
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NETWORK_UNREACHABLE,
_("Network unreachable through SOCKSv5 proxy."));
return FALSE;
break;
case SOCKS5_REP_REFUSED:
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CONNECTION_REFUSED,
_("Connection refused through SOCKSv5 proxy."));
return FALSE;
break;
case SOCKS5_REP_CMD_NOT_SUP:
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("SOCKSv5 proxy does not support “connect” command."));
return FALSE;
break;
case SOCKS5_REP_ATYPE_NOT_SUP:
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("SOCKSv5 proxy does not support provided address type."));
return FALSE;
break;
default: /* Unknown error */
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("Unknown SOCKSv5 proxy error."));
return FALSE;
break;
}
return TRUE;
}
static GIOStream *
g_socks5_proxy_connect (GProxy *proxy,
GIOStream *io_stream,
GProxyAddress *proxy_address,
GCancellable *cancellable,
GError **error)
{
gboolean has_auth;
GInputStream *in;
GOutputStream *out;
const gchar *hostname;
guint16 port;
const gchar *username;
const gchar *password;
hostname = g_proxy_address_get_destination_hostname (proxy_address);
port = g_proxy_address_get_destination_port (proxy_address);
username = g_proxy_address_get_username (proxy_address);
password = g_proxy_address_get_password (proxy_address);
has_auth = username || password;
in = g_io_stream_get_input_stream (io_stream);
out = g_io_stream_get_output_stream (io_stream);
/* Send SOCKS5 handshake */
{
guint8 msg[SOCKS5_NEGO_MSG_LEN];
size_t len;
len = set_nego_msg (msg, has_auth);
if (!g_output_stream_write_all (out, msg, len, NULL,
cancellable, error))
goto error;
}
/* Receive SOCKS5 response and reply with authentication if required */
{
guint8 data[SOCKS5_NEGO_REP_LEN];
gboolean must_auth = FALSE;
if (!g_input_stream_read_all (in, data, sizeof (data), NULL,
cancellable, error))
goto error;
if (!parse_nego_reply (data, has_auth, &must_auth, error))
goto error;
if (must_auth)
{
guint8 msg[SOCKS5_AUTH_MSG_LEN];
size_t len;
if (!set_auth_msg (msg, username, password, &len, error))
goto error;
if (!g_output_stream_write_all (out, msg, len, NULL,
cancellable, error))
goto error;
if (!g_input_stream_read_all (in, data, sizeof (data), NULL,
cancellable, error))
goto error;
if (!check_auth_status (data, error))
goto error;
}
}
/* Send SOCKS5 connection request */
{
guint8 msg[SOCKS5_CONN_MSG_LEN];
size_t len;
if (!set_connect_msg (msg, hostname, port, &len, error))
goto error;
if (!g_output_stream_write_all (out, msg, len, NULL,
cancellable, error))
goto error;
}
/* Read SOCKS5 response */
{
guint8 data[SOCKS5_CONN_REP_LEN];
gint atype;
if (!g_input_stream_read_all (in, data, 4 /* VER, REP, RSV, ATYP */, NULL,
cancellable, error))
goto error;
if (!parse_connect_reply (data, &atype, error))
goto error;
switch (atype)
{
case SOCKS5_ATYP_IPV4:
if (!g_input_stream_read_all (in, data,
4 /* IPv4 length */ + 2 /* port */,
NULL, cancellable, error))
goto error;
break;
case SOCKS5_ATYP_IPV6:
if (!g_input_stream_read_all (in, data,
16 /* IPv6 length */ + 2 /* port */,
NULL, cancellable, error))
goto error;
break;
case SOCKS5_ATYP_DOMAINNAME:
if (!g_input_stream_read_all (in, data, 1 /* domain name length */,
NULL, cancellable, error))
goto error;
if (!g_input_stream_read_all (in, data,
data[0] /* domain name length */ + 2 /* port */,
NULL, cancellable, error))
goto error;
break;
}
}
return g_object_ref (io_stream);
error:
return NULL;
}
typedef struct
{
GIOStream *io_stream;
gchar *hostname;
guint16 port;
gchar *username;
gchar *password;
guint8 *buffer;
size_t length;
size_t offset;
} ConnectAsyncData;
static void nego_msg_write_cb (GObject *source,
GAsyncResult *res,
gpointer user_data);
static void nego_reply_read_cb (GObject *source,
GAsyncResult *res,
gpointer user_data);
static void auth_msg_write_cb (GObject *source,
GAsyncResult *res,
gpointer user_data);
static void auth_reply_read_cb (GObject *source,
GAsyncResult *result,
gpointer user_data);
static void send_connect_msg (GTask *task);
static void connect_msg_write_cb (GObject *source,
GAsyncResult *result,
gpointer user_data);
static void connect_reply_read_cb (GObject *source,
GAsyncResult *result,
gpointer user_data);
static void connect_addr_len_read_cb (GObject *source,
GAsyncResult *result,
gpointer user_data);
static void connect_addr_read_cb (GObject *source,
GAsyncResult *result,
gpointer user_data);
static void
free_connect_data (ConnectAsyncData *data)
{
g_object_unref (data->io_stream);
g_free (data->hostname);
g_free (data->username);
g_free (data->password);
g_free (data->buffer);
g_slice_free (ConnectAsyncData, data);
}
static void
do_read (GAsyncReadyCallback callback, GTask *task, ConnectAsyncData *data)
{
GInputStream *in;
in = g_io_stream_get_input_stream (data->io_stream);
g_input_stream_read_async (in,
data->buffer + data->offset,
data->length - data->offset,
g_task_get_priority (task),
g_task_get_cancellable (task),
callback, task);
}
static void
do_write (GAsyncReadyCallback callback, GTask *task, ConnectAsyncData *data)
{
GOutputStream *out;
out = g_io_stream_get_output_stream (data->io_stream);
g_output_stream_write_async (out,
data->buffer + data->offset,
data->length - data->offset,
g_task_get_priority (task),
g_task_get_cancellable (task),
callback, task);
}
static void
g_socks5_proxy_connect_async (GProxy *proxy,
GIOStream *io_stream,
GProxyAddress *proxy_address,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GTask *task;
ConnectAsyncData *data;
data = g_slice_new0 (ConnectAsyncData);
data->io_stream = g_object_ref (io_stream);
task = g_task_new (proxy, cancellable, callback, user_data);
g_task_set_source_tag (task, g_socks5_proxy_connect_async);
g_task_set_task_data (task, data, (GDestroyNotify) free_connect_data);
g_object_get (G_OBJECT (proxy_address),
"destination-hostname", &data->hostname,
"destination-port", &data->port,
"username", &data->username,
"password", &data->password,
NULL);
data->buffer = g_malloc0 (SOCKS5_NEGO_MSG_LEN);
data->length = set_nego_msg (data->buffer,
data->username || data->password);
data->offset = 0;
do_write (nego_msg_write_cb, task, data);
}
static void
nego_msg_write_cb (GObject *source,
GAsyncResult *res,
gpointer user_data)
{
GTask *task = user_data;
ConnectAsyncData *data = g_task_get_task_data (task);
GError *error = NULL;
gssize written;
written = g_output_stream_write_finish (G_OUTPUT_STREAM (source),
res, &error);
if (written < 0)
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
data->offset += written;
if (data->offset == data->length)
{
g_free (data->buffer);
data->buffer = g_malloc0 (SOCKS5_NEGO_REP_LEN);
data->length = SOCKS5_NEGO_REP_LEN;
data->offset = 0;
do_read (nego_reply_read_cb, task, data);
}
else
{
do_write (nego_msg_write_cb, task, data);
}
}
static void
nego_reply_read_cb (GObject *source,
GAsyncResult *res,
gpointer user_data)
{
GTask *task = user_data;
ConnectAsyncData *data = g_task_get_task_data (task);
GError *error = NULL;
gssize read;
read = g_input_stream_read_finish (G_INPUT_STREAM (source),
res, &error);
if (read < 0)
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
if (read == 0)
{
g_task_return_new_error_literal (task,
G_IO_ERROR,
G_IO_ERROR_CONNECTION_CLOSED,
"Connection to SOCKSv5 proxy server lost");
g_object_unref (task);
return;
}
data->offset += read;
if (data->offset == data->length)
{
gboolean must_auth = FALSE;
gboolean has_auth = data->username || data->password;
if (!parse_nego_reply (data->buffer, has_auth, &must_auth, &error))
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
if (must_auth)
{
g_free (data->buffer);
data->buffer = g_malloc0 (SOCKS5_AUTH_MSG_LEN);
data->offset = 0;
if (!set_auth_msg (data->buffer,
data->username,
data->password,
&data->length,
&error))
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
do_write (auth_msg_write_cb, task, data);
}
else
{
send_connect_msg (task);
}
}
else
{
do_read (nego_reply_read_cb, task, data);
}
}
static void
auth_msg_write_cb (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GTask *task = user_data;
ConnectAsyncData *data = g_task_get_task_data (task);
GError *error = NULL;
gssize written;
written = g_output_stream_write_finish (G_OUTPUT_STREAM (source),
result, &error);
if (written < 0)
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
data->offset += written;
if (data->offset == data->length)
{
g_free (data->buffer);
data->buffer = g_malloc0 (SOCKS5_NEGO_REP_LEN);
data->length = SOCKS5_NEGO_REP_LEN;
data->offset = 0;
do_read (auth_reply_read_cb, task, data);
}
else
{
do_write (auth_msg_write_cb, task, data);
}
}
static void
auth_reply_read_cb (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GTask *task = user_data;
ConnectAsyncData *data = g_task_get_task_data (task);
GError *error = NULL;
gssize read;
read = g_input_stream_read_finish (G_INPUT_STREAM (source),
result, &error);
if (read < 0)
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
if (read == 0)
{
g_task_return_new_error_literal (task,
G_IO_ERROR,
G_IO_ERROR_CONNECTION_CLOSED,
"Connection to SOCKSv5 proxy server lost");
g_object_unref (task);
return;
}
data->offset += read;
if (data->offset == data->length)
{
if (!check_auth_status (data->buffer, &error))
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
send_connect_msg (task);
}
else
{
do_read (auth_reply_read_cb, task, data);
}
}
static void
send_connect_msg (GTask *task)
{
ConnectAsyncData *data = g_task_get_task_data (task);
GError *error = NULL;
g_free (data->buffer);
data->buffer = g_malloc0 (SOCKS5_CONN_MSG_LEN);
data->offset = 0;
if (!set_connect_msg (data->buffer,
data->hostname,
data->port,
&data->length,
&error))
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
do_write (connect_msg_write_cb, task, data);
}
static void
connect_msg_write_cb (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GTask *task = user_data;
ConnectAsyncData *data = g_task_get_task_data (task);
GError *error = NULL;
gssize written;
written = g_output_stream_write_finish (G_OUTPUT_STREAM (source),
result, &error);
if (written < 0)
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
data->offset += written;
if (data->offset == data->length)
{
g_free (data->buffer);
data->buffer = g_malloc0 (SOCKS5_CONN_REP_LEN);
data->length = 4;
data->offset = 0;
do_read (connect_reply_read_cb, task, data);
}
else
{
do_write (connect_msg_write_cb, task, data);
}
}
static void
connect_reply_read_cb (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GTask *task = user_data;
ConnectAsyncData *data = g_task_get_task_data (task);
GError *error = NULL;
gssize read;
read = g_input_stream_read_finish (G_INPUT_STREAM (source),
result, &error);
if (read < 0)
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
if (read == 0)
{
g_task_return_new_error_literal (task,
G_IO_ERROR,
G_IO_ERROR_CONNECTION_CLOSED,
"Connection to SOCKSv5 proxy server lost");
g_object_unref (task);
return;
}
data->offset += read;
if (data->offset == data->length)
{
gint atype;
if (!parse_connect_reply (data->buffer, &atype, &error))
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
switch (atype)
{
case SOCKS5_ATYP_IPV4:
data->length = 6;
data->offset = 0;
do_read (connect_addr_read_cb, task, data);
break;
case SOCKS5_ATYP_IPV6:
data->length = 18;
data->offset = 0;
do_read (connect_addr_read_cb, task, data);
break;
case SOCKS5_ATYP_DOMAINNAME:
data->length = 1;
data->offset = 0;
do_read (connect_addr_len_read_cb, task, data);
break;
}
}
else
{
do_read (connect_reply_read_cb, task, data);
}
}
static void
connect_addr_len_read_cb (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GTask *task = user_data;
ConnectAsyncData *data = g_task_get_task_data (task);
GError *error = NULL;
gssize read;
read = g_input_stream_read_finish (G_INPUT_STREAM (source),
result, &error);
if (read < 0)
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
if (read == 0)
{
g_task_return_new_error_literal (task,
G_IO_ERROR,
G_IO_ERROR_CONNECTION_CLOSED,
"Connection to SOCKSv5 proxy server lost");
g_object_unref (task);
return;
}
data->length = data->buffer[0] + 2;
data->offset = 0;
do_read (connect_addr_read_cb, task, data);
}
static void
connect_addr_read_cb (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GTask *task = user_data;
ConnectAsyncData *data = g_task_get_task_data (task);
GError *error = NULL;
gssize read;
read = g_input_stream_read_finish (G_INPUT_STREAM (source),
result, &error);
if (read < 0)
{
g_task_return_error (task, error);
g_object_unref (task);
return;
}
if (read == 0)
{
g_task_return_new_error_literal (task,
G_IO_ERROR,
G_IO_ERROR_CONNECTION_CLOSED,
"Connection to SOCKSv5 proxy server lost");
g_object_unref (task);
return;
}
data->offset += read;
if (data->offset == data->length)
{
g_task_return_pointer (task, g_object_ref (data->io_stream), g_object_unref);
g_object_unref (task);
return;
}
else
{
do_read (connect_reply_read_cb, task, data);
}
}
static GIOStream *
g_socks5_proxy_connect_finish (GProxy *proxy,
GAsyncResult *result,
GError **error)
{
return g_task_propagate_pointer (G_TASK (result), error);
}
static gboolean
g_socks5_proxy_supports_hostname (GProxy *proxy)
{
return TRUE;
}
static void
g_socks5_proxy_class_init (GSocks5ProxyClass *class)
{
GObjectClass *object_class;
object_class = (GObjectClass *) class;
object_class->finalize = g_socks5_proxy_finalize;
}
static void
g_socks5_proxy_iface_init (GProxyInterface *proxy_iface)
{
proxy_iface->connect = g_socks5_proxy_connect;
proxy_iface->connect_async = g_socks5_proxy_connect_async;
proxy_iface->connect_finish = g_socks5_proxy_connect_finish;
proxy_iface->supports_hostname = g_socks5_proxy_supports_hostname;
}
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