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xrdp/sesman/chansrv/chansrv.c
matt335672 4d8f2b5a31 Significant remote file system improvements 
- Reimplemented inode store in separate module chansrv_xfs.[hc]
- Allowed atimes and mtimes to be written to Windows side
- Mapped file user write bit to (inverted) Windows FILE_ATTRIBUTE_READONLY bit
- Mapped file user execute bit to Windows FILE_ATTRIBUTE_SYSTEM bit
- Implemented improved security for remotely mounted drives
- Implemented USB device removal, allowing hot-plug/remove of memory sticks
- Fixed pagefile.sys breaking Ubuntu file browser
- Fixed write offset bug
- Allowed renaming of open files
- Improved reported error codes
- Fixed various memory leaks
- Addressed valgrind errors related to struct fuse_file_info pointers.
2019-12-05 11:41:32 +00:00

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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2009-2013
* Copyright (C) Laxmikant Rashinkar 2009-2012
*
* 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.
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include "arch.h"
#include "os_calls.h"
#include "thread_calls.h"
#include "trans.h"
#include "chansrv.h"
#include "defines.h"
#include "sound.h"
#include "clipboard.h"
#include "devredir.h"
#include "list.h"
#include "file.h"
#include "log.h"
#include "rail.h"
#include "xcommon.h"
#include "chansrv_fuse.h"
#include "xrdp_sockets.h"
#include "audin.h"
static struct trans *g_lis_trans = 0;
static struct trans *g_con_trans = 0;
static struct trans *g_api_lis_trans = 0;
static struct list *g_api_con_trans_list = 0; /* list of apps using api functions */
static struct chan_item g_chan_items[32];
static int g_num_chan_items = 0;
static int g_cliprdr_index = -1;
static int g_rdpsnd_index = -1;
static int g_rdpdr_index = -1;
static int g_rail_index = -1;
static tbus g_term_event = 0;
static tbus g_thread_done_event = 0;
static int g_use_unix_socket = 0;
int g_display_num = 0;
int g_cliprdr_chan_id = -1; /* cliprdr */
int g_rdpsnd_chan_id = -1; /* rdpsnd */
int g_rdpdr_chan_id = -1; /* rdpdr */
int g_rail_chan_id = -1; /* rail */
int g_restrict_outbound_clipboard = 0;
char *g_exec_name;
tbus g_exec_event;
tbus g_exec_mutex;
tbus g_exec_sem;
int g_exec_pid = 0;
#define ARRAYSIZE(x) (sizeof(x)/sizeof(*(x)))
/* max total channel bytes size */
#define MAX_CHANNEL_BYTES (1 * 1024 * 1024 * 1024) /* 1 GB */
#define MAX_CHANNEL_FRAG_BYTES 1600
#define CHANSRV_DRDYNVC_STATUS_CLOSED 0
#define CHANSRV_DRDYNVC_STATUS_OPEN_SENT 1
#define CHANSRV_DRDYNVC_STATUS_OPEN 2
#define CHANSRV_DRDYNVC_STATUS_CLOSE_SENT 3
struct chansrv_drdynvc
{
int chan_id;
int status; /* see CHANSRV_DRDYNVC_STATUS_* */
int flags;
int pad0;
int (*open_response)(int chan_id, int creation_status);
int (*close_response)(int chan_id);
int (*data_first)(int chan_id, char *data, int bytes, int total_bytes);
int (*data)(int chan_id, char *data, int bytes);
struct trans *xrdp_api_trans;
};
static struct chansrv_drdynvc g_drdynvcs[256];
/* data in struct trans::callback_data */
struct xrdp_api_data
{
int chan_flags;
int chan_id;
};
struct timeout_obj
{
tui32 mstime;
void *data;
void (*callback)(void *data);
struct timeout_obj *next;
};
static struct timeout_obj *g_timeout_head = 0;
static struct timeout_obj *g_timeout_tail = 0;
/*****************************************************************************/
int
add_timeout(int msoffset, void (*callback)(void *data), void *data)
{
struct timeout_obj *tobj;
tui32 now;
LOG(10, ("add_timeout:"));
now = g_time3();
tobj = g_new0(struct timeout_obj, 1);
tobj->mstime = now + msoffset;
tobj->callback = callback;
tobj->data = data;
if (g_timeout_tail == 0)
{
g_timeout_head = tobj;
g_timeout_tail = tobj;
}
else
{
g_timeout_tail->next = tobj;
g_timeout_tail = tobj;
}
return 0;
}
/*****************************************************************************/
static int
get_timeout(int *timeout)
{
struct timeout_obj *tobj;
tui32 now;
int ltimeout;
LOG(10, ("get_timeout:"));
ltimeout = *timeout;
if (ltimeout < 1)
{
ltimeout = 0;
}
tobj = g_timeout_head;
if (tobj != 0)
{
now = g_time3();
while (tobj != 0)
{
LOG(10, (" now %u tobj->mstime %u", now, tobj->mstime));
if (now < tobj->mstime)
{
ltimeout = tobj->mstime - now;
}
tobj = tobj->next;
}
}
if (ltimeout > 0)
{
LOG(10, (" ltimeout %d", ltimeout));
if (*timeout < 1)
{
*timeout = ltimeout;
}
else
{
if (*timeout > ltimeout)
{
*timeout = ltimeout;
}
}
}
return 0;
}
/*****************************************************************************/
static int
check_timeout(void)
{
struct timeout_obj *tobj;
struct timeout_obj *last_tobj;
struct timeout_obj *temp_tobj;
int count;
tui32 now;
LOG(10, ("check_timeout:"));
count = 0;
tobj = g_timeout_head;
if (tobj != 0)
{
last_tobj = 0;
while (tobj != 0)
{
count++;
now = g_time3();
if (now >= tobj->mstime)
{
tobj->callback(tobj->data);
if (last_tobj == 0)
{
g_timeout_head = tobj->next;
if (g_timeout_head == 0)
{
g_timeout_tail = 0;
}
}
else
{
last_tobj->next = tobj->next;
if (g_timeout_tail == tobj)
{
g_timeout_tail = last_tobj;
}
}
temp_tobj = tobj;
tobj = tobj->next;
g_free(temp_tobj);
}
else
{
last_tobj = tobj;
tobj = tobj->next;
}
}
}
LOG(10, (" count %d", count));
return 0;
}
/*****************************************************************************/
int
g_is_term(void)
{
return g_is_wait_obj_set(g_term_event);
}
/*****************************************************************************/
/* send data to a static virtual channel
size can be > MAX_CHANNEL_FRAG_BYTES, in which case, > 1 message
will be sent*/
/* returns error */
int
send_channel_data(int chan_id, const char *data, int size)
{
int sending_bytes;
int chan_flags;
int error;
int total_size;
struct stream *s;
if ((chan_id < 0) || (chan_id > 31) ||
(data == NULL) ||
(size < 1) || (size > MAX_CHANNEL_BYTES))
{
/* bad param */
return 1;
}
total_size = size;
chan_flags = 1; /* first */
while (size > 0)
{
sending_bytes = MIN(MAX_CHANNEL_FRAG_BYTES, size);
if (sending_bytes >= size)
{
chan_flags |= 2; /* last */
}
s = trans_get_out_s(g_con_trans, 26 + sending_bytes);
if (s == NULL)
{
return 2;
}
out_uint32_le(s, 0); /* version */
out_uint32_le(s, 26 + sending_bytes);
out_uint32_le(s, 8); /* msg id */
out_uint32_le(s, 18 + sending_bytes);
out_uint16_le(s, chan_id);
out_uint16_le(s, chan_flags);
out_uint16_le(s, sending_bytes);
out_uint32_le(s, total_size);
out_uint8a(s, data, sending_bytes);
s_mark_end(s);
size -= sending_bytes;
data += sending_bytes;
error = trans_write_copy(g_con_trans);
if (error != 0)
{
return 3;
}
chan_flags = 0;
}
return 0;
}
/*****************************************************************************/
/* returns error */
int
send_rail_drawing_orders(char* data, int size)
{
LOGM((LOG_LEVEL_DEBUG, "chansrv::send_rail_drawing_orders: size %d", size));
struct stream* s;
int error;
s = trans_get_out_s(g_con_trans, 8192);
out_uint32_le(s, 0); /* version */
out_uint32_le(s, 8 + 8 + size); /* size */
out_uint32_le(s, 10); /* msg id */
out_uint32_le(s, 8 + size); /* size */
out_uint8a(s, data, size);
s_mark_end(s);
error = trans_force_write(g_con_trans);
if (error != 0)
{
return 1;
}
return 0;
}
/*****************************************************************************/
/* returns error */
static int
process_message_channel_setup(struct stream *s)
{
int num_chans;
int index;
int rv;
struct chan_item *ci;
g_num_chan_items = 0;
g_cliprdr_index = -1;
g_rdpsnd_index = -1;
g_rdpdr_index = -1;
g_rail_index = -1;
g_cliprdr_chan_id = -1;
g_rdpsnd_chan_id = -1;
g_rdpdr_chan_id = -1;
g_rail_chan_id = -1;
LOGM((LOG_LEVEL_DEBUG, "process_message_channel_setup:"));
in_uint16_le(s, num_chans);
LOGM((LOG_LEVEL_DEBUG, "process_message_channel_setup: num_chans %d",
num_chans));
for (index = 0; index < num_chans; index++)
{
ci = &(g_chan_items[g_num_chan_items]);
g_memset(ci->name, 0, sizeof(ci->name));
in_uint8a(s, ci->name, 8);
in_uint16_le(s, ci->id);
in_uint16_le(s, ci->flags);
LOGM((LOG_LEVEL_DEBUG, "process_message_channel_setup: chan name '%s' "
"id %d flags %8.8x", ci->name, ci->id, ci->flags));
g_writeln("process_message_channel_setup: chan name '%s' "
"id %d flags %8.8x", ci->name, ci->id, ci->flags);
if (g_strcasecmp(ci->name, "cliprdr") == 0)
{
g_cliprdr_index = g_num_chan_items;
g_cliprdr_chan_id = ci->id;
}
else if (g_strcasecmp(ci->name, "rdpsnd") == 0)
{
g_rdpsnd_index = g_num_chan_items;
g_rdpsnd_chan_id = ci->id;
}
else if (g_strcasecmp(ci->name, "rdpdr") == 0)
{
g_rdpdr_index = g_num_chan_items;
g_rdpdr_chan_id = ci->id;
}
/* disabled for now */
else if (g_strcasecmp(ci->name, "rail") == 0)
{
g_rail_index = g_num_chan_items;
g_rail_chan_id = ci->id;
}
else
{
LOG(10, ("other %s", ci->name));
}
g_num_chan_items++;
}
rv = 0;
if (g_cliprdr_index >= 0)
{
clipboard_init();
xfuse_init();
}
if (g_rdpsnd_index >= 0)
{
sound_init();
}
if (g_rdpdr_index >= 0)
{
devredir_init();
xfuse_init();
}
if (g_rail_index >= 0)
{
rail_init();
}
audin_init();
return rv;
}
/*****************************************************************************/
/* returns error */
static int
process_message_channel_data(struct stream *s)
{
int chan_id;
int chan_flags;
int rv;
int length;
int total_length;
int index;
int found;
struct stream *ls;
struct trans *ltran;
struct xrdp_api_data *api_data;
in_uint16_le(s, chan_id);
in_uint16_le(s, chan_flags);
in_uint16_le(s, length);
in_uint32_le(s, total_length);
LOGM((LOG_LEVEL_DEBUG, "process_message_channel_data: chan_id %d "
"chan_flags %d", chan_id, chan_flags));
LOG(10, ("process_message_channel_data"));
rv = 0;
if (rv == 0)
{
if (chan_id == g_cliprdr_chan_id)
{
rv = clipboard_data_in(s, chan_id, chan_flags, length, total_length);
}
else if (chan_id == g_rdpsnd_chan_id)
{
rv = sound_data_in(s, chan_id, chan_flags, length, total_length);
}
else if (chan_id == g_rdpdr_chan_id)
{
rv = devredir_data_in(s, chan_id, chan_flags, length, total_length);
}
else if (chan_id == g_rail_chan_id)
{
rv = rail_data_in(s, chan_id, chan_flags, length, total_length);
}
else
{
found = 0;
for (index = 0; index < g_api_con_trans_list->count; index++)
{
ltran = (struct trans *) list_get_item(g_api_con_trans_list, index);
if (ltran != NULL)
{
api_data = (struct xrdp_api_data *) (ltran->callback_data);
if (api_data != NULL)
{
if (api_data->chan_id == chan_id)
{
found = 1;
ls = ltran->out_s;
if (chan_flags & 1) /* first */
{
init_stream(ls, total_length);
}
out_uint8a(ls, s->p, length);
if (chan_flags & 2) /* last */
{
s_mark_end(ls);
rv = trans_write_copy(ltran);
}
break;
}
}
}
}
if (found == 0)
{
LOG(0, ("process_message_channel_data: not found channel %d", chan_id));
}
}
}
return rv;
}
/*****************************************************************************/
/* returns error */
/* open response from client */
static int
process_message_drdynvc_open_response(struct stream *s)
{
struct chansrv_drdynvc *drdynvc;
int chan_id;
int creation_status;
LOG(10, ("process_message_drdynvc_open_response:"));
if (!s_check_rem(s, 8))
{
return 1;
}
in_uint32_le(s, chan_id);
in_uint32_le(s, creation_status);
if ((chan_id < 0) || (chan_id > 255))
{
return 1;
}
drdynvc = g_drdynvcs + chan_id;
if (drdynvc->status != CHANSRV_DRDYNVC_STATUS_OPEN_SENT)
{
g_writeln("process_message_drdynvc_open_response: status not right");
return 1;
}
if (creation_status == 0)
{
drdynvc->status = CHANSRV_DRDYNVC_STATUS_OPEN;
}
else
{
drdynvc->status = CHANSRV_DRDYNVC_STATUS_CLOSED;
}
if (drdynvc->open_response != NULL)
{
if (drdynvc->open_response(chan_id, creation_status) != 0)
{
return 1;
}
}
return 0;
}
/*****************************************************************************/
/* returns error */
/* close response from client */
static int
process_message_drdynvc_close_response(struct stream *s)
{
struct chansrv_drdynvc *drdynvc;
int chan_id;
LOG(10, ("process_message_drdynvc_close_response:"));
if (!s_check_rem(s, 4))
{
return 1;
}
in_uint32_le(s, chan_id);
if ((chan_id < 0) || (chan_id > 255))
{
return 1;
}
drdynvc = g_drdynvcs + chan_id;
if (drdynvc->status != CHANSRV_DRDYNVC_STATUS_CLOSE_SENT)
{
g_writeln("process_message_drdynvc_close_response: status not right");
return 0;
}
drdynvc->status = CHANSRV_DRDYNVC_STATUS_CLOSED;
if (drdynvc->close_response != NULL)
{
if (drdynvc->close_response(chan_id) != 0)
{
return 1;
}
}
return 0;
}
/*****************************************************************************/
/* returns error */
/* data from client */
static int
process_message_drdynvc_data_first(struct stream *s)
{
struct chansrv_drdynvc *drdynvc;
int chan_id;
int bytes;
int total_bytes;
char *data;
LOG(10, ("process_message_drdynvc_data_first:"));
if (!s_check_rem(s, 12))
{
return 1;
}
in_uint32_le(s, chan_id);
in_uint32_le(s, bytes);
in_uint32_le(s, total_bytes);
if (!s_check_rem(s, bytes))
{
return 1;
}
in_uint8p(s, data, bytes);
if ((chan_id < 0) || (chan_id > 255))
{
return 1;
}
drdynvc = g_drdynvcs + chan_id;
if (drdynvc->data_first != NULL)
{
if (drdynvc->data_first(chan_id, data, bytes, total_bytes) != 0)
{
return 1;
}
}
return 0;
}
/*****************************************************************************/
/* returns error */
/* data from client */
static int
process_message_drdynvc_data(struct stream *s)
{
struct chansrv_drdynvc *drdynvc;
int chan_id;
int bytes;
char *data;
LOG(10, ("process_message_drdynvc_data:"));
if (!s_check_rem(s, 8))
{
return 1;
}
in_uint32_le(s, chan_id);
in_uint32_le(s, bytes);
if (!s_check_rem(s, bytes))
{
return 1;
}
in_uint8p(s, data, bytes);
drdynvc = g_drdynvcs + chan_id;
if (drdynvc->data != NULL)
{
if (drdynvc->data(chan_id, data, bytes) != 0)
{
return 1;
}
}
return 0;
}
/*****************************************************************************/
/* open call from chansrv */
int
chansrv_drdynvc_open(const char *name, int flags,
struct chansrv_drdynvc_procs *procs, int *chan_id)
{
struct stream *s;
int name_bytes;
int lchan_id;
int error;
lchan_id = 1;
while (g_drdynvcs[lchan_id].status != CHANSRV_DRDYNVC_STATUS_CLOSED)
{
lchan_id++;
if (lchan_id > 255)
{
return 1;
}
}
s = trans_get_out_s(g_con_trans, 8192);
if (s == NULL)
{
return 1;
}
name_bytes = g_strlen(name);
out_uint32_le(s, 0); /* version */
out_uint32_le(s, 8 + 8 + 4 + name_bytes + 4 + 4);
out_uint32_le(s, 12); /* msg id */
out_uint32_le(s, 8 + 4 + name_bytes + 4 + 4);
out_uint32_le(s, name_bytes);
out_uint8a(s, name, name_bytes);
out_uint32_le(s, flags);
out_uint32_le(s, lchan_id);
s_mark_end(s);
error = trans_write_copy(g_con_trans);
if (error == 0)
{
if (chan_id != NULL)
{
*chan_id = lchan_id;
g_drdynvcs[lchan_id].open_response = procs->open_response;
g_drdynvcs[lchan_id].close_response = procs->close_response;
g_drdynvcs[lchan_id].data_first = procs->data_first;
g_drdynvcs[lchan_id].data = procs->data;
g_drdynvcs[lchan_id].status = CHANSRV_DRDYNVC_STATUS_OPEN_SENT;
}
}
return error;
}
/*****************************************************************************/
/* close call from chansrv */
int
chansrv_drdynvc_close(int chan_id)
{
struct stream *s;
int error;
s = trans_get_out_s(g_con_trans, 8192);
if (s == NULL)
{
return 1;
}
out_uint32_le(s, 0); /* version */
out_uint32_le(s, 20);
out_uint32_le(s, 14); /* msg id */
out_uint32_le(s, 12);
out_uint32_le(s, chan_id);
s_mark_end(s);
error = trans_write_copy(g_con_trans);
g_drdynvcs[chan_id].status = CHANSRV_DRDYNVC_STATUS_CLOSE_SENT;
return error;
}
/*****************************************************************************/
int
chansrv_drdynvc_data_first(int chan_id, const char *data, int data_bytes,
int total_data_bytes)
{
struct stream *s;
int error;
//g_writeln("chansrv_drdynvc_data_first: data_bytes %d total_data_bytes %d",
// data_bytes, total_data_bytes);
s = trans_get_out_s(g_con_trans, 8192);
if (s == NULL)
{
return 1;
}
out_uint32_le(s, 0); /* version */
out_uint32_le(s, 28 + data_bytes);
out_uint32_le(s, 16); /* msg id */
out_uint32_le(s, 20 + data_bytes);
out_uint32_le(s, chan_id);
out_uint32_le(s, data_bytes);
out_uint32_le(s, total_data_bytes);
out_uint8a(s, data, data_bytes);
s_mark_end(s);
error = trans_write_copy(g_con_trans);
return error;
}
/*****************************************************************************/
int
chansrv_drdynvc_data(int chan_id, const char *data, int data_bytes)
{
struct stream *s;
int error;
//g_writeln("chansrv_drdynvc_data: data_bytes %d", data_bytes);
s = trans_get_out_s(g_con_trans, 8192);
if (s == NULL)
{
return 1;
}
out_uint32_le(s, 0); /* version */
out_uint32_le(s, 24 + data_bytes);
out_uint32_le(s, 18); /* msg id */
out_uint32_le(s, 16 + data_bytes);
out_uint32_le(s, chan_id);
out_uint32_le(s, data_bytes);
out_uint8a(s, data, data_bytes);
s_mark_end(s);
error = trans_write_copy(g_con_trans);
return error;
}
/*****************************************************************************/
int
chansrv_drdynvc_send_data(int chan_id, const char *data, int data_bytes)
{
int this_send_bytes;
//g_writeln("chansrv_drdynvc_send_data: data_bytes %d", data_bytes);
if (data_bytes > 1590)
{
if (chansrv_drdynvc_data_first(chan_id, data, 1590, data_bytes) != 0)
{
return 1;
}
data_bytes -= 1590;
data += 1590;
}
while (data_bytes > 0)
{
this_send_bytes = MIN(1590, data_bytes);
if (chansrv_drdynvc_data(chan_id, data, this_send_bytes) != 0)
{
return 1;
}
data_bytes -= this_send_bytes;
data += this_send_bytes;
}
return 0;
}
/*****************************************************************************/
/* returns error */
static int
process_message(void)
{
struct stream *s = (struct stream *)NULL;
int size = 0;
int id = 0;
int rv = 0;
char *next_msg = (char *)NULL;
if (g_con_trans == 0)
{
return 1;
}
s = trans_get_in_s(g_con_trans);
if (s == 0)
{
return 1;
}
rv = 0;
while (s_check_rem(s, 8))
{
next_msg = s->p;
in_uint32_le(s, id);
in_uint32_le(s, size);
next_msg += size;
switch (id)
{
case 3: /* channel setup */
rv = process_message_channel_setup(s);
break;
case 5: /* channel data */
rv = process_message_channel_data(s);
break;
case 13: /* drdynvc open response */
rv = process_message_drdynvc_open_response(s);
break;
case 15: /* drdynvc close response */
rv = process_message_drdynvc_close_response(s);
break;
case 17: /* drdynvc data first */
rv = process_message_drdynvc_data_first(s);
break;
case 19: /* drdynvc data */
rv = process_message_drdynvc_data(s);
break;
default:
LOGM((LOG_LEVEL_ERROR, "process_message: unknown msg %d", id));
break;
}
if (rv != 0)
{
g_writeln("process_message: error rv %d id %d", rv, id);
rv = 0;
}
s->p = next_msg;
}
return rv;
}
/*****************************************************************************/
/* returns error */
int
my_trans_data_in(struct trans *trans)
{
struct stream *s = (struct stream *)NULL;
int size = 0;
int error = 0;
if (trans == 0)
{
return 0;
}
if (trans != g_con_trans)
{
return 1;
}
LOGM((LOG_LEVEL_DEBUG, "my_trans_data_in:"));
s = trans_get_in_s(trans);
in_uint8s(s, 4); /* id */
in_uint32_le(s, size);
error = trans_force_read(trans, size - 8);
if (error == 0)
{
/* here, the entire message block is read in, process it */
error = process_message();
if (error == 0)
{
}
else
{
g_writeln("my_trans_data_in: process_message failed");
}
}
else
{
g_writeln("my_trans_data_in: trans_force_read failed");
}
return error;
}
/*****************************************************************************/
struct trans *
get_api_trans_from_chan_id(int chan_id)
{
return g_drdynvcs[chan_id].xrdp_api_trans;
}
/*****************************************************************************/
static int
my_api_open_response(int chan_id, int creation_status)
{
struct trans *trans;
struct stream *s;
//g_writeln("my_api_open_response: chan_id %d creation_status %d",
// chan_id, creation_status);
trans = get_api_trans_from_chan_id(chan_id);
if (trans == NULL)
{
return 1;
}
s = trans_get_out_s(trans, 8192);
if (s == NULL)
{
return 1;
}
out_uint32_le(s, creation_status);
s_mark_end(s);
if (trans_write_copy(trans) != 0)
{
return 1;
}
return 0;
}
/*****************************************************************************/
static int
my_api_close_response(int chan_id)
{
//g_writeln("my_api_close_response:");
return 0;
}
/*****************************************************************************/
static int
my_api_data_first(int chan_id, char *data, int bytes, int total_bytes)
{
struct trans *trans;
struct stream *s;
//g_writeln("my_api_data_first: bytes %d total_bytes %d", bytes, total_bytes);
trans = get_api_trans_from_chan_id(chan_id);
if (trans == NULL)
{
return 1;
}
s = trans_get_out_s(trans, bytes);
if (s == NULL)
{
return 1;
}
out_uint8a(s, data, bytes);
s_mark_end(s);
if (trans_write_copy(trans) != 0)
{
return 1;
}
return 0;
}
/*****************************************************************************/
static int
my_api_data(int chan_id, char *data, int bytes)
{
struct trans *trans;
struct stream *s;
//g_writeln("my_api_data: bytes %d", bytes);
trans = get_api_trans_from_chan_id(chan_id);
if (trans == NULL)
{
return 1;
}
s = trans_get_out_s(trans, bytes);
if (s == NULL)
{
return 1;
}
out_uint8a(s, data, bytes);
s_mark_end(s);
if (trans_write_copy(trans) != 0)
{
return 1;
}
return 0;
}
/*
* called when WTSVirtualChannelWrite() is invoked in xrdpapi.c
*
******************************************************************************/
int
my_api_trans_data_in(struct trans *trans)
{
struct stream *s;
struct stream *out_s;
struct xrdp_api_data *ad;
int index;
int rv;
int bytes;
int ver;
int channel_name_bytes;
struct chansrv_drdynvc_procs procs;
char *chan_name;
//g_writeln("my_api_trans_data_in: extra_flags %d", trans->extra_flags);
rv = 0;
ad = (struct xrdp_api_data *) (trans->callback_data);
s = trans_get_in_s(trans);
if (trans->extra_flags == 0)
{
in_uint32_le(s, bytes);
in_uint32_le(s, ver);
//g_writeln("my_api_trans_data_in: bytes %d ver %d", bytes, ver);
if (ver != 0)
{
return 1;
}
trans->header_size = bytes;
trans->extra_flags = 1;
}
else if (trans->extra_flags == 1)
{
rv = 1;
in_uint32_le(s, channel_name_bytes);
//g_writeln("my_api_trans_data_in: channel_name_bytes %d", channel_name_bytes);
chan_name = g_new0(char, channel_name_bytes + 1);
if (chan_name == NULL)
{
return 1;
}
in_uint8a(s, chan_name, channel_name_bytes);
in_uint32_le(s, ad->chan_flags);
//g_writeln("my_api_trans_data_in: chan_name %s chan_flags 0x%8.8x", chan_name, ad->chan_flags);
if (ad->chan_flags == 0)
{
/* SVC */
for (index = 0; index < g_num_chan_items; index++)
{
if (g_strcasecmp(g_chan_items[index].name, chan_name) == 0)
{
ad->chan_id = g_chan_items[index].id;
rv = 0;
break;
}
}
if (rv == 0)
{
/* open ok */
out_s = trans_get_out_s(trans, 8192);
if (out_s == NULL)
{
return 1;
}
out_uint32_le(out_s, 0);
s_mark_end(out_s);
if (trans_write_copy(trans) != 0)
{
return 1;
}
}
else
{
/* open failed */
out_s = trans_get_out_s(trans, 8192);
if (out_s == NULL)
{
return 1;
}
out_uint32_le(out_s, 1);
s_mark_end(out_s);
if (trans_write_copy(trans) != 0)
{
return 1;
}
}
}
else
{
/* DVS */
g_memset(&procs, 0, sizeof(procs));
procs.open_response = my_api_open_response;
procs.close_response = my_api_close_response;
procs.data_first = my_api_data_first;
procs.data = my_api_data;
rv = chansrv_drdynvc_open(chan_name, ad->chan_flags,
&procs, &(ad->chan_id));
//g_writeln("my_api_trans_data_in: chansrv_drdynvc_open rv %d "
// "chan_id %d", rv, ad->chan_id);
g_drdynvcs[ad->chan_id].xrdp_api_trans = trans;
}
g_free(chan_name);
init_stream(s, 0);
trans->extra_flags = 2;
trans->header_size = 0;
}
else
{
bytes = g_sck_recv(trans->sck, s->data, s->size, 0);
if (bytes < 1)
{
//g_writeln("my_api_trans_data_in: disconnect");
return 1;
}
if (ad->chan_flags == 0)
{
/* SVC */
rv = send_channel_data(ad->chan_id, s->data, bytes);
}
else
{
/* DVS */
//g_writeln("my_api_trans_data_in: s->size %d bytes %d", s->size, bytes);
rv = chansrv_drdynvc_send_data(ad->chan_id, s->data, bytes);
}
init_stream(s, 0);
}
return rv;
}
/*****************************************************************************/
int
my_trans_conn_in(struct trans *trans, struct trans *new_trans)
{
if (trans == 0)
{
return 1;
}
if (trans != g_lis_trans)
{
return 1;
}
if (g_con_trans != 0) /* if already set, error */
{
return 1;
}
if (new_trans == 0)
{
return 1;
}
LOGM((LOG_LEVEL_DEBUG, "my_trans_conn_in:"));
g_con_trans = new_trans;
g_con_trans->trans_data_in = my_trans_data_in;
g_con_trans->header_size = 8;
/* stop listening */
trans_delete(g_lis_trans);
g_lis_trans = 0;
return 0;
}
/*
* called when WTSVirtualChannelOpenEx is invoked in xrdpapi.c
*
******************************************************************************/
int
my_api_trans_conn_in(struct trans *trans, struct trans *new_trans)
{
struct xrdp_api_data *ad;
//g_writeln("my_api_trans_conn_in:");
if ((trans == NULL) || (trans != g_api_lis_trans) || (new_trans == NULL))
{
g_writeln("my_api_trans_conn_in: error");
return 1;
}
new_trans->trans_data_in = my_api_trans_data_in;
new_trans->header_size = 8;
new_trans->no_stream_init_on_data_in = 1;
ad = g_new0(struct xrdp_api_data, 1);
if (ad == NULL)
{
g_writeln("my_api_trans_conn_in: error");
return 1;
}
new_trans->callback_data = ad;
list_add_item(g_api_con_trans_list, (intptr_t) new_trans);
return 0;
}
/*****************************************************************************/
static int
setup_listen(void)
{
char port[256];
int error = 0;
if (g_lis_trans != 0)
{
trans_delete(g_lis_trans);
}
if (g_use_unix_socket)
{
g_lis_trans = trans_create(TRANS_MODE_UNIX, 8192, 8192);
g_lis_trans->is_term = g_is_term;
g_snprintf(port, 255, XRDP_CHANSRV_STR, g_display_num);
}
else
{
g_lis_trans = trans_create(TRANS_MODE_TCP, 8192, 8192);
g_lis_trans->is_term = g_is_term;
g_snprintf(port, 255, "%d", 7200 + g_display_num);
}
g_lis_trans->trans_conn_in = my_trans_conn_in;
error = trans_listen(g_lis_trans, port);
if (error != 0)
{
LOGM((LOG_LEVEL_ERROR, "setup_listen: trans_listen failed for port %s",
port));
return 1;
}
return 0;
}
/*****************************************************************************/
static int
setup_api_listen(void)
{
char port[256];
int error = 0;
g_api_lis_trans = trans_create(TRANS_MODE_UNIX, 8192 * 4, 8192 * 4);
g_api_lis_trans->is_term = g_is_term;
g_snprintf(port, 255, CHANSRV_API_STR, g_display_num);
g_api_lis_trans->trans_conn_in = my_api_trans_conn_in;
error = trans_listen(g_api_lis_trans, port);
if (error != 0)
{
LOGM((LOG_LEVEL_ERROR, "setup_api_listen: trans_listen failed for port %s",
port));
return 1;
}
return 0;
}
/*****************************************************************************/
static int
api_con_trans_list_get_wait_objs_rw(intptr_t *robjs, int *rcount,
intptr_t *wobjs, int *wcount,
int *timeout)
{
int api_con_index;
struct trans *ltran;
for (api_con_index = g_api_con_trans_list->count - 1;
api_con_index >= 0;
api_con_index--)
{
ltran = (struct trans *)
list_get_item(g_api_con_trans_list, api_con_index);
if (ltran != NULL)
{
trans_get_wait_objs_rw(ltran, robjs, rcount, wobjs, wcount,
timeout);
}
}
return 0;
}
/*****************************************************************************/
static int
api_con_trans_list_check_wait_objs(void)
{
int api_con_index;
int drdynvc_index;
struct trans *ltran;
struct xrdp_api_data *ad;
for (api_con_index = g_api_con_trans_list->count - 1;
api_con_index >= 0;
api_con_index--)
{
ltran = (struct trans *)
list_get_item(g_api_con_trans_list, api_con_index);
if (ltran != NULL)
{
if (trans_check_wait_objs(ltran) != 0)
{
/* disconnect */
list_remove_item(g_api_con_trans_list, api_con_index);
ad = (struct xrdp_api_data *) (ltran->callback_data);
if (ad->chan_flags != 0)
{
chansrv_drdynvc_close(ad->chan_id);
}
for (drdynvc_index = 0;
drdynvc_index < (int) ARRAYSIZE(g_drdynvcs);
drdynvc_index++)
{
if (g_drdynvcs[drdynvc_index].xrdp_api_trans == ltran)
{
g_drdynvcs[drdynvc_index].xrdp_api_trans = NULL;
}
}
g_free(ad);
trans_delete(ltran);
}
}
}
return 0;
}
/*****************************************************************************/
static int
api_con_trans_list_remove_all(void)
{
int api_con_index;
struct trans *ltran;
for (api_con_index = g_api_con_trans_list->count - 1;
api_con_index >= 0;
api_con_index--)
{
ltran = (struct trans *)
list_get_item(g_api_con_trans_list, api_con_index);
if (ltran != NULL)
{
list_remove_item(g_api_con_trans_list, api_con_index);
g_free(ltran->callback_data);
trans_delete(ltran);
}
}
return 0;
}
/*****************************************************************************/
THREAD_RV THREAD_CC
channel_thread_loop(void *in_val)
{
tbus objs[32];
tbus wobjs[32];
int num_objs;
int num_wobjs;
int timeout;
int error;
THREAD_RV rv;
LOGM((LOG_LEVEL_INFO, "channel_thread_loop: thread start"));
rv = 0;
g_api_con_trans_list = list_create();
setup_api_listen();
error = setup_listen();
if (error == 0)
{
timeout = -1;
num_objs = 0;
num_wobjs = 0;
objs[num_objs] = g_term_event;
num_objs++;
trans_get_wait_objs(g_lis_trans, objs, &num_objs);
trans_get_wait_objs(g_api_lis_trans, objs, &num_objs);
//g_writeln("timeout %d", timeout);
while (g_obj_wait(objs, num_objs, wobjs, num_wobjs, timeout) == 0)
{
check_timeout();
if (g_is_wait_obj_set(g_term_event))
{
LOGM((LOG_LEVEL_INFO, "channel_thread_loop: g_term_event set"));
clipboard_deinit();
sound_deinit();
devredir_deinit();
rail_deinit();
break;
}
if (g_lis_trans != 0)
{
if (trans_check_wait_objs(g_lis_trans) != 0)
{
LOGM((LOG_LEVEL_INFO, "channel_thread_loop: "
"trans_check_wait_objs error"));
}
}
if (g_con_trans != 0)
{
if (trans_check_wait_objs(g_con_trans) != 0)
{
LOGM((LOG_LEVEL_INFO, "channel_thread_loop: "
"trans_check_wait_objs error resetting"));
clipboard_deinit();
sound_deinit();
devredir_deinit();
rail_deinit();
/* delete g_con_trans */
trans_delete(g_con_trans);
g_con_trans = 0;
/* create new listener */
error = setup_listen();
if (error != 0)
{
break;
}
}
}
if (g_api_lis_trans != 0)
{
if (trans_check_wait_objs(g_api_lis_trans) != 0)
{
LOG(0, ("channel_thread_loop: trans_check_wait_objs failed"));
}
}
/* check the wait_objs in g_api_con_trans_list */
api_con_trans_list_check_wait_objs();
xcommon_check_wait_objs();
sound_check_wait_objs();
devredir_check_wait_objs();
xfuse_check_wait_objs();
timeout = -1;
num_objs = 0;
num_wobjs = 0;
objs[num_objs] = g_term_event;
num_objs++;
trans_get_wait_objs_rw(g_lis_trans, objs, &num_objs,
wobjs, &num_wobjs, &timeout);
trans_get_wait_objs_rw(g_con_trans, objs, &num_objs,
wobjs, &num_wobjs, &timeout);
trans_get_wait_objs_rw(g_api_lis_trans, objs, &num_objs,
wobjs, &num_wobjs, &timeout);
/* get the wait_objs from in g_api_con_trans_list */
api_con_trans_list_get_wait_objs_rw(objs, &num_objs,
wobjs, &num_wobjs,
&timeout);
xcommon_get_wait_objs(objs, &num_objs, &timeout);
sound_get_wait_objs(objs, &num_objs, &timeout);
devredir_get_wait_objs(objs, &num_objs, &timeout);
xfuse_get_wait_objs(objs, &num_objs, &timeout);
get_timeout(&timeout);
} /* end while (g_obj_wait(objs, num_objs, 0, 0, timeout) == 0) */
}
trans_delete(g_lis_trans);
g_lis_trans = 0;
trans_delete(g_con_trans);
g_con_trans = 0;
trans_delete(g_api_lis_trans);
g_api_lis_trans = 0;
api_con_trans_list_remove_all();
list_delete(g_api_con_trans_list);
LOGM((LOG_LEVEL_INFO, "channel_thread_loop: thread stop"));
g_set_wait_obj(g_thread_done_event);
return rv;
}
/*****************************************************************************/
void
term_signal_handler(int sig)
{
LOGM((LOG_LEVEL_INFO, "term_signal_handler: got signal %d", sig));
g_set_wait_obj(g_term_event);
}
/*****************************************************************************/
void
nil_signal_handler(int sig)
{
LOGM((LOG_LEVEL_INFO, "nil_signal_handler: got signal %d", sig));
}
/*****************************************************************************/
void
child_signal_handler(int sig)
{
int pid;
LOG(0, ("child_signal_handler:"));
do
{
pid = g_waitchild();
LOG(0, ("child_signal_handler: child pid %d", pid));
if ((pid == g_exec_pid) && (pid > 0))
{
LOG(0, ("child_signal_handler: found pid %d", pid));
//shutdownx();
}
}
while (pid >= 0);
}
/*****************************************************************************/
void
segfault_signal_handler(int sig)
{
LOG(0, ("segfault_signal_handler: entered......."));
xfuse_deinit();
exit(0);
}
/*****************************************************************************/
static void
x_server_fatal_handler(void)
{
LOGM((LOG_LEVEL_INFO, "xserver_fatal_handler: entered......."));
/* At this point the X server has gone away. Dont make any X calls. */
xfuse_deinit();
exit(0);
}
/*****************************************************************************/
static int
get_display_num_from_display(char *display_text)
{
int index;
int mode;
int host_index;
int disp_index;
int scre_index;
char host[256];
char disp[256];
char scre[256];
g_memset(host, 0, 256);
g_memset(disp, 0, 256);
g_memset(scre, 0, 256);
index = 0;
host_index = 0;
disp_index = 0;
scre_index = 0;
mode = 0;
while (display_text[index] != 0)
{
if (display_text[index] == ':')
{
mode = 1;
}
else if (display_text[index] == '.')
{
mode = 2;
}
else if (mode == 0)
{
host[host_index] = display_text[index];
host_index++;
}
else if (mode == 1)
{
disp[disp_index] = display_text[index];
disp_index++;
}
else if (mode == 2)
{
scre[scre_index] = display_text[index];
scre_index++;
}
index++;
}
host[host_index] = 0;
disp[disp_index] = 0;
scre[scre_index] = 0;
g_display_num = g_atoi(disp);
return 0;
}
/*****************************************************************************/
int
main_cleanup(void)
{
g_delete_wait_obj(g_term_event);
g_delete_wait_obj(g_thread_done_event);
g_delete_wait_obj(g_exec_event);
tc_mutex_delete(g_exec_mutex);
g_deinit(); /* os_calls */
return 0;
}
/*****************************************************************************/
static int
read_ini(void)
{
char filename[256];
struct list *names;
struct list *values;
char *name;
char *value;
int index;
g_memset(filename, 0, (sizeof(char) * 256));
names = list_create();
names->auto_free = 1;
values = list_create();
values->auto_free = 1;
g_use_unix_socket = 0;
g_snprintf(filename, 255, "%s/sesman.ini", XRDP_CFG_PATH);
if (file_by_name_read_section(filename, "Globals", names, values) == 0)
{
for (index = 0; index < names->count; index++)
{
name = (char *)list_get_item(names, index);
value = (char *)list_get_item(values, index);
if (g_strcasecmp(name, "ListenAddress") == 0)
{
if (g_strcasecmp(value, "127.0.0.1") == 0)
{
g_use_unix_socket = 1;
}
}
}
}
list_delete(names);
list_delete(values);
return 0;
}
/*****************************************************************************/
static int
get_log_path(char *path, int bytes)
{
char* log_path;
int rv;
rv = 1;
log_path = g_getenv("CHANSRV_LOG_PATH");
if (log_path == 0)
{
log_path = g_getenv("XDG_DATA_HOME");
if (log_path != 0)
{
g_snprintf(path, bytes, "%s%s", log_path, "/xrdp");
if (g_directory_exist(path) || (g_mkdir(path) == 0))
{
rv = 0;
}
}
}
else
{
g_snprintf(path, bytes, "%s", log_path);
if (g_directory_exist(path) || (g_mkdir(path) == 0))
{
rv = 0;
}
}
if (rv != 0)
{
log_path = g_getenv("HOME");
if (log_path != 0)
{
g_snprintf(path, bytes, "%s%s", log_path, "/.local");
if (g_directory_exist(path) || (g_mkdir(path) == 0))
{
g_snprintf(path, bytes, "%s%s", log_path, "/.local/share");
if (g_directory_exist(path) || (g_mkdir(path) == 0))
{
g_snprintf(path, bytes, "%s%s", log_path, "/.local/share/xrdp");
if (g_directory_exist(path) || (g_mkdir(path) == 0))
{
rv = 0;
}
}
}
}
}
return rv;
}
/*****************************************************************************/
static enum logLevels
get_log_level(const char* level_str, enum logLevels default_level)
{
static const char* levels[] = {
"LOG_LEVEL_ALWAYS",
"LOG_LEVEL_ERROR",
"LOG_LEVEL_WARNING",
"LOG_LEVEL_INFO",
"LOG_LEVEL_DEBUG",
"LOG_LEVEL_TRACE"
};
unsigned int i;
if (level_str == NULL || level_str[0] == 0)
{
return default_level;
}
for (i = 0; i < ARRAYSIZE(levels); ++i)
{
if (g_strcasecmp(levels[i], level_str) == 0)
{
return (enum logLevels) i;
}
}
return default_level;
}
/*****************************************************************************/
static int
run_exec(void)
{
int pid;
LOG(10, ("run_exec:"));
pid = g_fork();
if (pid == 0)
{
trans_delete(g_con_trans);
g_close_wait_obj(g_term_event);
g_close_wait_obj(g_thread_done_event);
g_close_wait_obj(g_exec_event);
tc_mutex_delete(g_exec_mutex);
tc_sem_delete(g_exec_sem);
g_execlp3(g_exec_name, g_exec_name, 0);
g_exit(0);
}
g_exec_pid = pid;
tc_sem_inc(g_exec_sem);
return 0;
}
/*****************************************************************************/
int
main(int argc, char **argv)
{
tbus waiters[4];
int pid = 0;
char text[256];
char log_path[256];
char *display_text;
char log_file[256];
enum logReturns error;
struct log_config logconfig;
enum logLevels log_level;
char *restrict_outbound_clipboard_env;
g_init("xrdp-chansrv"); /* os_calls */
log_path[255] = 0;
if (get_log_path(log_path, 255) != 0)
{
g_writeln("error reading CHANSRV_LOG_PATH and HOME environment variable");
g_deinit();
return 1;
}
restrict_outbound_clipboard_env = g_getenv("CHANSRV_RESTRICT_OUTBOUND_CLIPBOARD");
if (restrict_outbound_clipboard_env != 0)
{
if (g_strcmp(restrict_outbound_clipboard_env, "1") == 0)
{
g_restrict_outbound_clipboard = 1;
}
}
read_ini();
pid = g_getpid();
display_text = g_getenv("DISPLAY");
if (display_text)
get_display_num_from_display(display_text);
log_level = get_log_level(g_getenv("CHANSRV_LOG_LEVEL"), LOG_LEVEL_INFO);
/* starting logging subsystem */
g_memset(&logconfig, 0, sizeof(struct log_config));
logconfig.program_name = "xrdp-chansrv";
g_snprintf(log_file, 255, "%s/xrdp-chansrv.%d.log", log_path, g_display_num);
g_writeln("chansrv::main: using log file [%s]", log_file);
if (g_file_exist(log_file))
{
g_file_delete(log_file);
}
g_memset(g_drdynvcs, 0, sizeof(g_drdynvcs));
logconfig.log_file = log_file;
logconfig.fd = -1;
logconfig.log_level = log_level;
logconfig.enable_syslog = 0;
logconfig.syslog_level = LOG_LEVEL_ALWAYS;
error = log_start_from_param(&logconfig);
if (error != LOG_STARTUP_OK)
{
switch (error)
{
case LOG_ERROR_MALLOC:
g_writeln("error on malloc. cannot start logging. quitting.");
break;
case LOG_ERROR_FILE_OPEN:
g_writeln("error opening log file [%s]. quitting.",
getLogFile(text, 255));
break;
default:
g_writeln("log_start error");
break;
}
g_deinit();
return 1;
}
LOGM((LOG_LEVEL_ALWAYS, "main: app started pid %d(0x%8.8x)", pid, pid));
/* set up signal handler */
g_signal_terminate(term_signal_handler); /* SIGTERM */
g_signal_user_interrupt(term_signal_handler); /* SIGINT */
g_signal_pipe(nil_signal_handler); /* SIGPIPE */
g_signal_child_stop(child_signal_handler); /* SIGCHLD */
g_signal_segfault(segfault_signal_handler);
/* Cater for the X server exiting unexpectedly */
xcommon_set_x_server_fatal_handler(x_server_fatal_handler);
LOGM((LOG_LEVEL_INFO, "main: DISPLAY env var set to %s", display_text));
if (g_display_num == 0)
{
LOGM((LOG_LEVEL_ERROR, "main: error, display is zero"));
g_deinit();
return 1;
}
LOGM((LOG_LEVEL_INFO, "main: using DISPLAY %d", g_display_num));
g_snprintf(text, 255, "xrdp_chansrv_%8.8x_main_term", pid);
g_term_event = g_create_wait_obj(text);
g_snprintf(text, 255, "xrdp_chansrv_%8.8x_thread_done", pid);
g_thread_done_event = g_create_wait_obj(text);
g_snprintf(text, 255, "xrdp_chansrv_%8.8x_exec", pid);
g_exec_event = g_create_wait_obj(text);
g_exec_mutex = tc_mutex_create();
g_exec_sem = tc_sem_create(0);
tc_thread_create(channel_thread_loop, 0);
while (g_term_event > 0 && !g_is_wait_obj_set(g_term_event))
{
waiters[0] = g_term_event;
waiters[1] = g_exec_event;
if (g_obj_wait(waiters, 2, 0, 0, 0) != 0)
{
LOGM((LOG_LEVEL_ERROR, "main: error, g_obj_wait failed"));
break;
}
if (g_is_wait_obj_set(g_term_event))
{
break;
}
if (g_is_wait_obj_set(g_exec_event))
{
g_reset_wait_obj(g_exec_event);
run_exec();
}
}
while (g_thread_done_event > 0 && !g_is_wait_obj_set(g_thread_done_event))
{
/* wait for thread to exit */
if (g_obj_wait(&g_thread_done_event, 1, 0, 0, 0) != 0)
{
LOGM((LOG_LEVEL_ERROR, "main: error, g_obj_wait failed"));
break;
}
}
/* cleanup */
main_cleanup();
LOGM((LOG_LEVEL_INFO, "main: app exiting pid %d(0x%8.8x)", pid, pid));
g_deinit();
return 0;
}
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