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/*
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
xrdp: A Remote Desktop Protocol server.
Copyright (C) Jay Sorg 2005-2007
*/
/**
*
* @file libscp_v0.c
* @brief libscp version 0 code
* @author Simone Fedele
*
*/
#include "libscp_v0.h"
#include "os_calls.h"
/* client API */
/******************************************************************************/
enum SCP_CLIENT_STATES_E scp_v0c_connect(struct SCP_CONNECTION* c, struct SCP_SESSION* s)
{
tui32 version;
tui32 size;
tui16 sz;
init_stream(c->in_s, c->in_s->size);
init_stream(c->out_s, c->in_s->size);
g_tcp_set_non_blocking(c->in_sck);
g_tcp_set_no_delay(c->in_sck);
s_push_layer(c->out_s, channel_hdr, 8);
if (s->type==SCP_SESSION_TYPE_XVNC)
{
out_uint16_be(c->out_s, 0); // code
}
else if (s->type==SCP_SESSION_TYPE_XRDP)
{
out_uint16_be(c->out_s, 10); // code
}
else
{
return SCP_CLIENT_STATE_INTERNAL_ERR;
}
sz = g_strlen(s->username);
out_uint16_be(c->out_s, sz);
out_uint8a(c->out_s, s->username, sz);
sz = g_strlen(s->password);
out_uint16_be(c->out_s,sz);
out_uint8a(c->out_s, s->password, sz);
out_uint16_be(c->out_s, s->width);
out_uint16_be(c->out_s, s->height);
out_uint16_be(c->out_s, s->bpp);
s_mark_end(c->out_s);
s_pop_layer(c->out_s, channel_hdr);
out_uint32_be(c->out_s, 0); // version
out_uint32_be(c->out_s, c->out_s->end - c->out_s->data); // size
if (0!=scp_tcp_force_send(c->in_sck, c->out_s->data, c->out_s->end - c->out_s->data))
{
return SCP_CLIENT_STATE_NETWORK_ERR;
}
if (0!=scp_tcp_force_recv(c->in_sck, c->in_s->data, 8))
{
return SCP_CLIENT_STATE_NETWORK_ERR;
}
in_uint32_be(c->in_s, version);
if (0 != version)
{
return SCP_CLIENT_STATE_VERSION_ERR;
}
in_uint32_be(c->in_s, size);
if (size < 14)
{
return SCP_CLIENT_STATE_SIZE_ERR;
}
init_stream(c->in_s, c->in_s->size);
if (0!=scp_tcp_force_recv(c->in_sck, c->in_s->data, size - 8))
{
return SCP_CLIENT_STATE_NETWORK_ERR;
}
in_uint16_be(c->in_s, sz);
if (3!=sz)
{
return SCP_CLIENT_STATE_SEQUENCE_ERR;
}
in_uint16_be(c->in_s, sz);
if (1!=sz)
{
return SCP_CLIENT_STATE_CONNECTION_DENIED;
}
in_uint16_be(c->in_s, sz);
s->display=sz;
return SCP_CLIENT_STATE_END;
}
/* server API */
/******************************************************************************/
enum SCP_SERVER_STATES_E scp_v0s_accept(struct SCP_CONNECTION* c, struct SCP_SESSION** s, int skipVchk)
{
tui32 version=0;
tui32 size;
struct SCP_SESSION* session=0;
tui16 sz;
tui32 code=0;
if (!skipVchk)
{
if (0==scp_tcp_force_recv(c->in_sck, c->in_s->data, 8))
{
in_uint32_be(c->in_s, version);
if (version != 0)
{
return SCP_SERVER_STATE_VERSION_ERR;
}
}
else
{
return SCP_SERVER_STATE_NETWORK_ERR;
}
}
in_uint32_be(c->in_s, size);
init_stream(c->in_s, 8196);
if (0!=scp_tcp_force_recv(c->in_sck, c->in_s->data, size-8))
{
return SCP_SERVER_STATE_NETWORK_ERR;
}
in_uint16_be(c->in_s, code);
if (code == 0 || code == 10)
{
session = g_malloc(sizeof(struct SCP_SESSION),1);
if (0 == session)
{
return SCP_SERVER_STATE_INTERNAL_ERR;
}
session->version=version;
if (code == 0)
{
session->type=SCP_SESSION_TYPE_XVNC;
}
else
{
session->type=SCP_SESSION_TYPE_XRDP;
}
/* reading username */
in_uint16_be(c->in_s, sz);
session->username=g_malloc(sz+1,0);
if (0==session->username)
{
g_free(session);
return SCP_SERVER_STATE_INTERNAL_ERR;
}
session->username[sz]='\0';
in_uint8a(c->in_s, session->username, sz);
/* reading password */
in_uint16_be(c->in_s, sz);
session->password=g_malloc(sz+1,0);
if (0==session->password)
{
g_free(session->username);
g_free(session);
return SCP_SERVER_STATE_INTERNAL_ERR;
}
session->password[sz]='\0';
in_uint8a(c->in_s, session->password, sz);
in_uint16_be(c->in_s, session->width);
in_uint16_be(c->in_s, session->height);
in_uint16_be(c->in_s, sz);
session->bpp=(unsigned char)sz;
}
else
{
return SCP_SERVER_STATE_SEQUENCE_ERR;
}
(*s)=session;
return SCP_SERVER_STATE_OK;
}
/******************************************************************************/
enum SCP_SERVER_STATES_E scp_v0s_allow_connection(struct SCP_CONNECTION* c, SCP_DISPLAY d)
{
out_uint32_be(c->out_s, 0); /* version */
out_uint32_be(c->out_s, 14); /* size */
out_uint16_be(c->out_s, 3); /* cmd */
out_uint16_be(c->out_s, 1); /* data */
out_uint16_be(c->out_s, d); /* data */
s_mark_end(c->out_s);
if (0!=scp_tcp_force_send(c->in_sck, c->out_s->data, c->out_s->end - c->out_s->data))
{
return SCP_SERVER_STATE_NETWORK_ERR;
}
return SCP_SERVER_STATE_OK;
}
/******************************************************************************/
enum SCP_SERVER_STATES_E scp_v0s_deny_connection(struct SCP_CONNECTION* c)
{
out_uint32_be(c->out_s, 0); /* version */
out_uint32_be(c->out_s, 14); /* size */
out_uint16_be(c->out_s, 3); /* cmd */
out_uint16_be(c->out_s, 0); /* data */
out_uint16_be(c->out_s, 0); /* data */
s_mark_end(c->out_s);
if (0!=scp_tcp_force_send(c->in_sck, c->out_s->data, c->out_s->end - c->out_s->data))
{
return SCP_SERVER_STATE_NETWORK_ERR;
}
return SCP_SERVER_STATE_OK;
}
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