148 lines
4.9 KiB
C
148 lines
4.9 KiB
C
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/**
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* @file BSocksClient.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* SOCKS5 client. TCP only, no authentication.
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*/
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#ifndef BADVPN_SOCKS_BSOCKSCLIENT_H
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#define BADVPN_SOCKS_BSOCKSCLIENT_H
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#include <stdint.h>
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#include <misc/debug.h>
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#include <misc/debugerror.h>
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#include <misc/socks_proto.h>
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#include <misc/packed.h>
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#include <base/DebugObject.h>
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#include <system/BConnection.h>
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#include <flow/PacketStreamSender.h>
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#define BSOCKSCLIENT_EVENT_ERROR 1
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#define BSOCKSCLIENT_EVENT_UP 2
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#define BSOCKSCLIENT_EVENT_ERROR_CLOSED 3
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/**
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* Handler for events generated by the SOCKS client.
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*
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* @param user as in {@link BSocksClient_Init}
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* @param event event type. One of BSOCKSCLIENT_EVENT_ERROR, BSOCKSCLIENT_EVENT_UP
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* and BSOCKSCLIENT_EVENT_ERROR_CLOSED.
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* If event is BSOCKSCLIENT_EVENT_UP, the object was previously in down
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* state and has transitioned to up state; I/O can be done from this point on.
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* If event is BSOCKSCLIENT_EVENT_ERROR or BSOCKSCLIENT_EVENT_ERROR_CLOSED,
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* the object must be freed from within the job closure of this handler,
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* and no further I/O must be attempted.
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*/
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typedef void (*BSocksClient_handler) (void *user, int event);
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struct BSocksClient_auth_info {
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int auth_type;
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union {
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struct {
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const char *username;
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size_t username_len;
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const char *password;
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size_t password_len;
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} password;
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};
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};
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typedef struct {
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const struct BSocksClient_auth_info *auth_info;
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size_t num_auth_info;
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BAddr dest_addr;
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BSocksClient_handler handler;
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void *user;
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BReactor *reactor;
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int state;
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char *buffer;
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BConnector connector;
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BConnection con;
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union {
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struct {
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PacketPassInterface *send_if;
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PacketStreamSender send_sender;
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StreamRecvInterface *recv_if;
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uint8_t *recv_dest;
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int recv_len;
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int recv_total;
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} control;
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};
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DebugError d_err;
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DebugObject d_obj;
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} BSocksClient;
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struct BSocksClient_auth_info BSocksClient_auth_none (void);
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struct BSocksClient_auth_info BSocksClient_auth_password (const char *username, size_t username_len, const char *password, size_t password_len);
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/**
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* Initializes the object.
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* The object is initialized in down state. The object must transition to up
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* state before the user may begin any I/O.
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*
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* @param o the object
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* @param server_addr SOCKS5 server address
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* @param dest_addr remote address
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* @param handler handler for up and error events
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* @param user value passed to handler
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* @param reactor reactor we live in
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* @return 1 on success, 0 on failure
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*/
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int BSocksClient_Init (BSocksClient *o,
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BAddr server_addr, const struct BSocksClient_auth_info *auth_info, size_t num_auth_info,
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BAddr dest_addr, BSocksClient_handler handler, void *user, BReactor *reactor) WARN_UNUSED;
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/**
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* Frees the object.
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*
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* @param o the object
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*/
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void BSocksClient_Free (BSocksClient *o);
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/**
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* Returns the send interface.
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* The object must be in up state.
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*
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* @param o the object
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* @return send interface
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*/
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StreamPassInterface * BSocksClient_GetSendInterface (BSocksClient *o);
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/**
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* Returns the receive interface.
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* The object must be in up state.
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*
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* @param o the object
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* @return receive interface
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*/
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StreamRecvInterface * BSocksClient_GetRecvInterface (BSocksClient *o);
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#endif
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