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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 2005-2010
*/
/**
*
* @file libscp_v0.c
* @brief libscp version 0 code
* @author Simone Fedele
*
*/
#include "libscp_v0.h"
#include "os_calls.h"
extern struct log_config* s_log;
/* 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);
LOG_DBG(s_log, "[v0:%d] starting connection", __LINE__);
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);
/* code */
if (s->type == SCP_SESSION_TYPE_XVNC)
{
out_uint16_be(c->out_s, 0);
}
else if (s->type == SCP_SESSION_TYPE_XRDP)
{
out_uint16_be(c->out_s, 10);
}
else
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: network error", __LINE__);
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);
/* version */
out_uint32_be(c->out_s, 0);
/* size */
out_uint32_be(c->out_s, c->out_s->end - c->out_s->data);
if (0!=scp_tcp_force_send(c->in_sck, c->out_s->data, c->out_s->end - c->out_s->data))
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: network error", __LINE__);
return SCP_CLIENT_STATE_NETWORK_ERR;
}
if (0!=scp_tcp_force_recv(c->in_sck, c->in_s->data, 8))
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: network error", __LINE__);
return SCP_CLIENT_STATE_NETWORK_ERR;
}
in_uint32_be(c->in_s, version);
if (0 != version)
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: version error", __LINE__);
return SCP_CLIENT_STATE_VERSION_ERR;
}
in_uint32_be(c->in_s, size);
if (size < 14)
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: packet size error", __LINE__);
return SCP_CLIENT_STATE_SIZE_ERR;
}
/* getting payload */
init_stream(c->in_s, c->in_s->size);
if (0!=scp_tcp_force_recv(c->in_sck, c->in_s->data, size - 8))
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: network error", __LINE__);
return SCP_CLIENT_STATE_NETWORK_ERR;
}
/* check code */
in_uint16_be(c->in_s, sz);
if (3 != sz)
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: sequence error", __LINE__);
return SCP_CLIENT_STATE_SEQUENCE_ERR;
}
/* message payload */
in_uint16_be(c->in_s, sz);
if (1 != sz)
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: connection denied", __LINE__);
return SCP_CLIENT_STATE_CONNECTION_DENIED;
}
in_uint16_be(c->in_s, sz);
s->display = sz;
LOG_DBG(s_log, "[v0:%d] connection terminated", __LINE__);
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;
char buf[257];
if (!skipVchk)
{
LOG_DBG(s_log, "[v0:%d] starting connection", __LINE__);
if (0 == scp_tcp_force_recv(c->in_sck, c->in_s->data, 8))
{
c->in_s->end = c->in_s->data + 8;
in_uint32_be(c->in_s, version);
if (version != 0)
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: version error", __LINE__);
return SCP_SERVER_STATE_VERSION_ERR;
}
}
else
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: network error", __LINE__);
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))
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
c->in_s->end = c->in_s->data + (size - 8);
in_uint16_be(c->in_s, code);
if (code == 0 || code == 10)
{
session = scp_session_create();
if (0 == session)
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_INTERNAL_ERR;
}
scp_session_set_version(session, version);
if (code == 0)
{
scp_session_set_type(session, SCP_SESSION_TYPE_XVNC);
}
else
{
scp_session_set_type(session, SCP_SESSION_TYPE_XRDP);
}
/* reading username */
in_uint16_be(c->in_s, sz);
buf[sz]='\0';
in_uint8a(c->in_s, buf, sz);
if (0 != scp_session_set_username(session, buf))
{
scp_session_destroy(session);
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: error setting username", __LINE__);
return SCP_SERVER_STATE_INTERNAL_ERR;
}
/* reading password */
in_uint16_be(c->in_s, sz);
buf[sz]='\0';
in_uint8a(c->in_s, buf, sz);
if (0 != scp_session_set_password(session, buf))
{
scp_session_destroy(session);
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: error setting password", __LINE__);
return SCP_SERVER_STATE_INTERNAL_ERR;
}
/* width */
in_uint16_be(c->in_s, sz);
scp_session_set_width(session, sz);
/* height */
in_uint16_be(c->in_s, sz);
scp_session_set_height(session, sz);
/* bpp */
in_uint16_be(c->in_s, sz);
scp_session_set_bpp(session, (tui8)sz);
if (s_check_rem(c->in_s, 2))
{
/* reading domain */
in_uint16_be(c->in_s, sz);
if (sz > 0)
{
in_uint8a(c->in_s, buf, sz);
buf[sz] = '\0';
scp_session_set_domain(session, buf);
}
}
if (s_check_rem(c->in_s, 2))
{
/* reading program */
in_uint16_be(c->in_s, sz);
if (sz > 0)
{
in_uint8a(c->in_s, buf, sz);
buf[sz] = '\0';
scp_session_set_program(session, buf);
}
}
if (s_check_rem(c->in_s, 2))
{
/* reading directory */
in_uint16_be(c->in_s, sz);
if (sz > 0)
{
in_uint8a(c->in_s, buf, sz);
buf[sz] = '\0';
scp_session_set_directory(session, buf);
}
}
if (s_check_rem(c->in_s, 2))
{
/* reading client IP address */
in_uint16_be(c->in_s, sz);
if (sz > 0)
{
in_uint8a(c->in_s, buf, sz);
buf[sz] = '\0';
scp_session_set_client_ip(session, buf);
}
}
}
else
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: sequence error", __LINE__);
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))
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
LOG_DBG(s_log, "[v0:%d] connection terminated (allowed)", __LINE__);
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))
{
log_message(s_log, LOG_LEVEL_WARNING, "[v0:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
LOG_DBG(s_log, "[v0:%d] connection terminated (denied)", __LINE__);
return SCP_SERVER_STATE_OK;
}
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