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xrdp/sesman/libscp/libscp_v1s.c
Pavel Roskin 5de1d31a75 Change an unconditional #warning to a comment 
Notes about software design should not be shown as warnings to everybody
who compiles the code. Warnings should be about unexpected conditions
detected at the compile time.
2016-01-31 23:42:16 -08:00

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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2012
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*
* @file libscp_v1s.c
* @brief libscp version 1 server api code
* @author Simone Fedele
*
*/
#ifndef LIBSCP_V1S_C
#define LIBSCP_V1S_C
#include "libscp_v1s.h"
//extern struct log_config* s_log;
/* server API */
enum SCP_SERVER_STATES_E scp_v1s_accept(struct SCP_CONNECTION *c, struct SCP_SESSION **s, int skipVchk)
{
struct SCP_SESSION *session;
tui32 version;
tui32 size;
tui16 cmdset;
tui16 cmd;
tui8 sz;
char buf[257];
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 != 1)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: version error", __LINE__);
return SCP_SERVER_STATE_VERSION_ERR;
}
}
else
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
}
in_uint32_be(c->in_s, size);
if (size < 12)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: size error", __LINE__);
return SCP_SERVER_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)))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
/* reading command set */
in_uint16_be(c->in_s, cmdset);
/* if we are starting a management session */
if (cmdset == SCP_COMMAND_SET_MANAGE)
{
log_message(LOG_LEVEL_DEBUG, "[v1s:%d] requested management connection", __LINE__);
/* should return SCP_SERVER_STATE_START_MANAGE */
return scp_v1s_mng_accept(c, s);
}
/* if we started with resource sharing... */
if (cmdset == SCP_COMMAND_SET_RSR)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: sequence error", __LINE__);
return SCP_SERVER_STATE_SEQUENCE_ERR;
}
/* reading command */
in_uint16_be(c->in_s, cmd);
if (cmd != 1)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: sequence error", __LINE__);
return SCP_SERVER_STATE_SEQUENCE_ERR;
}
session = scp_session_create();
if (0 == session)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: internal error (malloc returned NULL)", __LINE__);
return SCP_SERVER_STATE_INTERNAL_ERR;
}
scp_session_set_version(session, 1);
in_uint8(c->in_s, sz);
if ((sz != SCP_SESSION_TYPE_XVNC) && (sz != SCP_SESSION_TYPE_XRDP))
{
scp_session_destroy(session);
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: unknown session type", __LINE__);
return SCP_SERVER_STATE_SESSION_TYPE_ERR;
}
scp_session_set_type(session, sz);
in_uint16_be(c->in_s, cmd);
scp_session_set_height(session, cmd);
in_uint16_be(c->in_s, cmd);
scp_session_set_height(session, cmd);
in_uint8(c->in_s, sz);
scp_session_set_bpp(session, sz);
in_uint8(c->in_s, sz);
scp_session_set_rsr(session, sz);
in_uint8a(c->in_s, buf, 17);
buf[17] = '\0';
scp_session_set_locale(session, buf);
in_uint8(c->in_s, sz);
if (sz == SCP_ADDRESS_TYPE_IPV4)
{
in_uint32_be(c->in_s, size);
scp_session_set_addr(session, SCP_ADDRESS_TYPE_IPV4_BIN, &size);
}
else if (sz == SCP_ADDRESS_TYPE_IPV6)
{
in_uint8a(c->in_s, buf, 16);
scp_session_set_addr(session, SCP_ADDRESS_TYPE_IPV6_BIN, buf);
}
buf[256] = '\0';
/* reading hostname */
in_uint8(c->in_s, sz);
buf[sz] = '\0';
in_uint8a(c->in_s, buf, sz);
if (0 != scp_session_set_hostname(session, buf))
{
scp_session_destroy(session);
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: internal error", __LINE__);
return SCP_SERVER_STATE_INTERNAL_ERR;
}
/* reading username */
in_uint8(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(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: internal error", __LINE__);
return SCP_SERVER_STATE_INTERNAL_ERR;
}
/* reading password */
in_uint8(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(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: internal error", __LINE__);
return SCP_SERVER_STATE_INTERNAL_ERR;
}
/* returning the struct */
(*s) = session;
return SCP_SERVER_STATE_OK;
}
enum SCP_SERVER_STATES_E
scp_v1s_deny_connection(struct SCP_CONNECTION *c, char *reason)
{
int rlen;
init_stream(c->out_s, c->out_s->size);
/* forcing message not to exceed 64k */
rlen = g_strlen(reason);
if (rlen > 65535)
{
rlen = 65535;
}
out_uint32_be(c->out_s, 1);
/* packet size: 4 + 4 + 2 + 2 + 2 + strlen(reason)*/
/* version + size + cmdset + cmd + msglen + msg */
out_uint32_be(c->out_s, rlen + 14);
out_uint16_be(c->out_s, SCP_COMMAND_SET_DEFAULT);
out_uint16_be(c->out_s, 2);
out_uint16_be(c->out_s, rlen);
out_uint8p(c->out_s, reason, rlen);
if (0 != scp_tcp_force_send(c->in_sck, c->out_s->data, rlen + 14))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
return SCP_SERVER_STATE_END;
}
enum SCP_SERVER_STATES_E
scp_v1s_request_password(struct SCP_CONNECTION *c, struct SCP_SESSION *s, char *reason)
{
tui8 sz;
tui32 version;
tui32 size;
tui16 cmdset;
tui16 cmd;
int rlen;
char buf[257];
init_stream(c->in_s, c->in_s->size);
init_stream(c->out_s, c->out_s->size);
/* forcing message not to exceed 64k */
rlen = g_strlen(reason);
if (rlen > 65535)
{
rlen = 65535;
}
/* send password request */
version = 1;
cmd = 3;
out_uint32_be(c->out_s, version); /* version */
out_uint32_be(c->out_s, 14 + rlen); /* size */
out_uint16_be(c->out_s, SCP_COMMAND_SET_DEFAULT); /* cmdset */
out_uint16_be(c->out_s, cmd); /* cmd */
out_uint16_be(c->out_s, rlen);
out_uint8p(c->out_s, reason, rlen);
if (0 != scp_tcp_force_send(c->in_sck, c->out_s->data, 14 + rlen))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
/* receive password & username */
if (0 != scp_tcp_force_recv(c->in_sck, c->in_s->data, 8))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
in_uint32_be(c->in_s, version);
if (version != 1)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: version error", __LINE__);
return SCP_SERVER_STATE_VERSION_ERR;
}
in_uint32_be(c->in_s, size);
if (size < 12)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: size error", __LINE__);
return SCP_SERVER_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)))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
in_uint16_be(c->in_s, cmdset);
if (cmdset != SCP_COMMAND_SET_DEFAULT)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: sequence error", __LINE__);
return SCP_SERVER_STATE_SEQUENCE_ERR;
}
in_uint16_be(c->in_s, cmd);
if (cmd != 4)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: sequence error", __LINE__);
return SCP_SERVER_STATE_SEQUENCE_ERR;
}
buf[256] = '\0';
/* reading username */
in_uint8(c->in_s, sz);
buf[sz] = '\0';
in_uint8a(c->in_s, buf, sz);
if (0 != scp_session_set_username(s, buf))
{
scp_session_destroy(s);
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: internal error", __LINE__);
return SCP_SERVER_STATE_INTERNAL_ERR;
}
/* reading password */
in_uint8(c->in_s, sz);
buf[sz] = '\0';
in_uint8a(c->in_s, buf, sz);
if (0 != scp_session_set_password(s, buf))
{
scp_session_destroy(s);
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: internal error", __LINE__);
return SCP_SERVER_STATE_INTERNAL_ERR;
}
return SCP_SERVER_STATE_OK;
}
/* 020 */
enum SCP_SERVER_STATES_E
scp_v1s_request_pwd_change(struct SCP_CONNECTION *c, char *reason, char *npw)
{
return SCP_SERVER_STATE_INTERNAL_ERR;
}
/* 023 */
enum SCP_SERVER_STATES_E
scp_v1s_pwd_change_error(struct SCP_CONNECTION *c, char *error, int retry, char *npw)
{
return SCP_SERVER_STATE_INTERNAL_ERR;
}
/* 030 */
enum SCP_SERVER_STATES_E
scp_v1s_connect_new_session(struct SCP_CONNECTION *c, SCP_DISPLAY d)
{
/* send password request */
tui32 version = 1;
tui32 size = 14;
tui16 cmd = 30;
init_stream(c->out_s, c->out_s->size);
out_uint32_be(c->out_s, version); /* version */
out_uint32_be(c->out_s, size); /* size */
out_uint16_be(c->out_s, SCP_COMMAND_SET_DEFAULT); /* cmdset */
out_uint16_be(c->out_s, cmd); /* cmd */
out_uint16_be(c->out_s, d); /* display */
if (0 != scp_tcp_force_send(c->in_sck, c->out_s->data, 14))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
return SCP_SERVER_STATE_OK;
}
/* 032 */
enum SCP_SERVER_STATES_E
scp_v1s_connection_error(struct SCP_CONNECTION *c, char *error)
{
tui16 len;
len = g_strlen(error);
init_stream(c->out_s, c->out_s->size);
out_uint32_be(c->out_s, 1);
/* packet size: 4 + 4 + 2 + 2 + len */
/* version + size + cmdset + cmd */
out_uint32_be(c->out_s, (12 + len));
out_uint16_be(c->out_s, SCP_COMMAND_SET_DEFAULT);
out_uint16_be(c->out_s, SCP_CMD_CONN_ERROR);
if (0 != scp_tcp_force_send(c->in_sck, c->out_s->data, (12 + len)))
{
return SCP_SERVER_STATE_NETWORK_ERR;
}
return SCP_SERVER_STATE_END;
}
/* 040 */
enum SCP_SERVER_STATES_E
scp_v1s_list_sessions(struct SCP_CONNECTION *c, int sescnt, struct SCP_DISCONNECTED_SESSION *ds, SCP_SID *sid)
{
tui32 version = 1;
tui32 size = 12;
tui16 cmd = 40;
int pktcnt;
int idx;
int sidx;
int pidx;
struct SCP_DISCONNECTED_SESSION *cds;
/* first we send a notice that we have some disconnected sessions */
init_stream(c->out_s, c->out_s->size);
out_uint32_be(c->out_s, version); /* version */
out_uint32_be(c->out_s, size); /* size */
out_uint16_be(c->out_s, SCP_COMMAND_SET_DEFAULT); /* cmdset */
out_uint16_be(c->out_s, cmd); /* cmd */
if (0 != scp_tcp_force_send(c->in_sck, c->out_s->data, size))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
/* then we wait for client ack */
/*
* Maybe this message could say if the session should be resized on
* server side or client side.
*/
init_stream(c->in_s, c->in_s->size);
if (0 != scp_tcp_force_recv(c->in_sck, c->in_s->data, 8))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
in_uint32_be(c->in_s, version);
if (version != 1)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: version error", __LINE__);
return SCP_SERVER_STATE_VERSION_ERR;
}
in_uint32_be(c->in_s, size);
if (size < 12)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: size error", __LINE__);
return SCP_SERVER_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)))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
in_uint16_be(c->in_s, cmd);
if (cmd != SCP_COMMAND_SET_DEFAULT)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: sequence error", __LINE__);
return SCP_SERVER_STATE_SEQUENCE_ERR;
}
in_uint16_be(c->in_s, cmd);
if (cmd != 41)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: sequence error", __LINE__);
return SCP_SERVER_STATE_SEQUENCE_ERR;
}
/* calculating the number of packets to send */
pktcnt = sescnt / SCP_SERVER_MAX_LIST_SIZE;
if ((sescnt % SCP_SERVER_MAX_LIST_SIZE) != 0)
{
pktcnt++;
}
for (idx = 0; idx < pktcnt; idx++)
{
/* ok, we send session session list */
init_stream(c->out_s, c->out_s->size);
/* size: ver+size+cmdset+cmd+sescnt+continue+count */
size = 4 + 4 + 2 + 2 + 4 + 1 + 1;
/* header */
cmd = 42;
s_push_layer(c->out_s, channel_hdr, 8);
out_uint16_be(c->out_s, SCP_COMMAND_SET_DEFAULT);
out_uint16_be(c->out_s, cmd);
/* session count */
out_uint32_be(c->out_s, sescnt);
/* setting the continue flag */
if ((idx + 1)*SCP_SERVER_MAX_LIST_SIZE >= sescnt)
{
out_uint8(c->out_s, 0);
/* setting session count for this packet */
pidx = sescnt - (idx * SCP_SERVER_MAX_LIST_SIZE);
out_uint8(c->out_s, pidx);
}
else
{
out_uint8(c->out_s, 1);
/* setting session count for this packet */
pidx = SCP_SERVER_MAX_LIST_SIZE;
out_uint8(c->out_s, pidx);
}
/* adding session descriptors */
for (sidx = 0; sidx < pidx; sidx++)
{
/* shortcut to the current session to send */
cds = ds + ((idx) * SCP_SERVER_MAX_LIST_SIZE) + sidx;
/* session data */
out_uint32_be(c->out_s, cds->SID); /* session id */
out_uint8(c->out_s, cds->type);
out_uint16_be(c->out_s, cds->height);
out_uint16_be(c->out_s, cds->width);
out_uint8(c->out_s, cds->bpp);
out_uint8(c->out_s, cds->idle_days);
out_uint8(c->out_s, cds->idle_hours);
out_uint8(c->out_s, cds->idle_minutes);
size += 13;
out_uint16_be(c->out_s, cds->conn_year);
out_uint8(c->out_s, cds->conn_month);
out_uint8(c->out_s, cds->conn_day);
out_uint8(c->out_s, cds->conn_hour);
out_uint8(c->out_s, cds->conn_minute);
out_uint8(c->out_s, cds->addr_type);
size += 7;
if (cds->addr_type == SCP_ADDRESS_TYPE_IPV4)
{
in_uint32_be(c->out_s, cds->ipv4addr);
size += 4;
}
else if (cds->addr_type == SCP_ADDRESS_TYPE_IPV6)
{
in_uint8a(c->out_s, cds->ipv6addr, 16);
size += 16;
}
}
s_pop_layer(c->out_s, channel_hdr);
out_uint32_be(c->out_s, version);
out_uint32_be(c->out_s, size);
if (0 != scp_tcp_force_send(c->in_sck, c->out_s->data, size))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
}
/* we get the response */
init_stream(c->in_s, c->in_s->size);
if (0 != scp_tcp_force_recv(c->in_sck, c->in_s->data, (8)))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
in_uint32_be(c->in_s, version);
if (version != 1)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: version error", __LINE__);
return SCP_SERVER_STATE_VERSION_ERR;
}
in_uint32_be(c->in_s, size);
if (size < 12)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: size error", __LINE__);
return SCP_SERVER_STATE_SIZE_ERR;
}
/* rest of the packet */
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(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
in_uint16_be(c->in_s, cmd);
if (cmd != SCP_COMMAND_SET_DEFAULT)
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: sequence error", __LINE__);
return SCP_SERVER_STATE_SEQUENCE_ERR;
}
in_uint16_be(c->in_s, cmd);
if (cmd == 43)
{
/* select session */
in_uint32_be(c->in_s, (*sid));
/* checking sid value */
for (idx = 0; idx < sescnt; idx++)
{
/* the sid is valid */
if (ds[idx].SID == (*sid))
{
/* ok, session selected */
return SCP_SERVER_STATE_OK;
}
}
/* if we got here, the requested sid wasn't one from the list we sent */
/* we should kill the connection */
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: internal error (no such session in list)", __LINE__);
return SCP_CLIENT_STATE_INTERNAL_ERR;
}
else if (cmd == 44)
{
/* cancel connection */
return SCP_SERVER_STATE_SELECTION_CANCEL;
}
// else if (cmd == 45)
// {
// /* force new connection */
// return SCP_SERVER_STATE_FORCE_NEW;
// }
else
{
/* wrong response */
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: sequence error", __LINE__);
return SCP_SERVER_STATE_SEQUENCE_ERR;
}
return SCP_SERVER_STATE_OK;
}
/* 046 was: 031 struct SCP_DISCONNECTED_SESSION* ds, */
enum SCP_SERVER_STATES_E
scp_v1s_reconnect_session(struct SCP_CONNECTION *c, SCP_DISPLAY d)
{
tui32 version = 1;
tui32 size = 14;
tui16 cmd = 46;
/* ok, we send session data and display */
init_stream(c->out_s, c->out_s->size);
/* header */
out_uint32_be(c->out_s, version);
out_uint32_be(c->out_s, size);
out_uint16_be(c->out_s, SCP_COMMAND_SET_DEFAULT);
out_uint16_be(c->out_s, cmd);
/* session data */
out_uint16_be(c->out_s, d); /* session display */
/*out_uint8(c->out_s, ds->type);
out_uint16_be(c->out_s, ds->height);
out_uint16_be(c->out_s, ds->width);
out_uint8(c->out_s, ds->bpp);
out_uint8(c->out_s, ds->idle_days);
out_uint8(c->out_s, ds->idle_hours);
out_uint8(c->out_s, ds->idle_minutes);*/
/* these last three are not really needed... */
if (0 != scp_tcp_force_send(c->in_sck, c->out_s->data, size))
{
log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: network error", __LINE__);
return SCP_SERVER_STATE_NETWORK_ERR;
}
return SCP_SERVER_STATE_OK;
}
#endif
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