549 lines
15 KiB
C++
Executable File
549 lines
15 KiB
C++
Executable File
/* cygserver.cc
|
|
|
|
Copyright 2001 Red Hat Inc.
|
|
|
|
Written by Egor Duda <deo@logos-m.ru>
|
|
|
|
This file is part of Cygwin.
|
|
|
|
This software is a copyrighted work licensed under the terms of the
|
|
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
|
|
details. */
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <windows.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netdb.h>
|
|
#include <signal.h>
|
|
#include "wincap.h"
|
|
#include "cygwin_version.h"
|
|
|
|
#include "getopt.h"
|
|
|
|
#include "cygwin/cygserver_transport.h"
|
|
#include "cygwin/cygserver_transport_pipes.h"
|
|
#include "cygwin/cygserver_transport_sockets.h"
|
|
#include "threaded_queue.h"
|
|
#include "cygwin/cygserver_process.h"
|
|
#include "cygwin/cygserver.h"
|
|
#include "cygserver_shm.h"
|
|
|
|
/* for quieter operation, set to 0 */
|
|
#define DEBUG 0
|
|
#define debug_printf if (DEBUG) printf
|
|
|
|
GENERIC_MAPPING access_mapping;
|
|
static class transport_layer_base *transport;
|
|
|
|
DWORD request_count = 0;
|
|
|
|
BOOL
|
|
setup_privileges ()
|
|
{
|
|
BOOL rc, ret_val;
|
|
HANDLE hToken = NULL;
|
|
TOKEN_PRIVILEGES sPrivileges;
|
|
|
|
rc = OpenProcessToken ( GetCurrentProcess() , TOKEN_ALL_ACCESS , &hToken ) ;
|
|
if ( !rc )
|
|
{
|
|
printf ( "error opening process token (%lu)\n", GetLastError () );
|
|
ret_val = FALSE;
|
|
goto out;
|
|
}
|
|
rc = LookupPrivilegeValue ( NULL, SE_DEBUG_NAME, &sPrivileges.Privileges[0].Luid );
|
|
if ( !rc )
|
|
{
|
|
printf ( "error getting prigilege luid (%lu)\n", GetLastError () );
|
|
ret_val = FALSE;
|
|
goto out;
|
|
}
|
|
sPrivileges.PrivilegeCount = 1 ;
|
|
sPrivileges.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED ;
|
|
rc = AdjustTokenPrivileges ( hToken, FALSE, &sPrivileges, 0, NULL, NULL ) ;
|
|
if ( !rc )
|
|
{
|
|
printf ( "error adjusting prigilege level. (%lu)\n", GetLastError () );
|
|
ret_val = FALSE;
|
|
goto out;
|
|
}
|
|
|
|
access_mapping.GenericRead = FILE_READ_DATA;
|
|
access_mapping.GenericWrite = FILE_WRITE_DATA;
|
|
access_mapping.GenericExecute = 0;
|
|
access_mapping.GenericAll = FILE_READ_DATA | FILE_WRITE_DATA;
|
|
|
|
ret_val = TRUE;
|
|
|
|
out:
|
|
CloseHandle ( hToken );
|
|
return ret_val;
|
|
}
|
|
|
|
int
|
|
check_and_dup_handle (HANDLE from_process, HANDLE to_process,
|
|
HANDLE from_process_token,
|
|
DWORD access,
|
|
HANDLE from_handle,
|
|
HANDLE* to_handle_ptr, BOOL bInheritHandle = FALSE)
|
|
{
|
|
HANDLE local_handle = NULL;
|
|
int ret_val = EACCES;
|
|
char sd_buf [1024];
|
|
PSECURITY_DESCRIPTOR sd = (PSECURITY_DESCRIPTOR) &sd_buf;
|
|
DWORD bytes_needed;
|
|
PRIVILEGE_SET ps;
|
|
DWORD ps_len = sizeof (ps);
|
|
BOOL status;
|
|
|
|
if (from_process != GetCurrentProcess ())
|
|
{
|
|
|
|
if (!DuplicateHandle (from_process, from_handle,
|
|
GetCurrentProcess (), &local_handle,
|
|
0, bInheritHandle,
|
|
DUPLICATE_SAME_ACCESS))
|
|
{
|
|
printf ( "error getting handle(%u) to server (%lu)\n", (unsigned int)from_handle, GetLastError ());
|
|
goto out;
|
|
}
|
|
} else
|
|
local_handle = from_handle;
|
|
|
|
if (!GetKernelObjectSecurity (local_handle,
|
|
OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION,
|
|
sd, sizeof (sd_buf), &bytes_needed))
|
|
{
|
|
printf ( "error getting handle SD (%lu)\n", GetLastError ());
|
|
goto out;
|
|
}
|
|
|
|
MapGenericMask (&access, &access_mapping);
|
|
|
|
if (!AccessCheck (sd, from_process_token, access, &access_mapping,
|
|
&ps, &ps_len, &access, &status))
|
|
{
|
|
printf ( "error checking access rights (%lu)\n", GetLastError ());
|
|
goto out;
|
|
}
|
|
|
|
if (!status)
|
|
{
|
|
printf ( "access to object denied\n");
|
|
goto out;
|
|
}
|
|
|
|
if (!DuplicateHandle (from_process, from_handle,
|
|
to_process, to_handle_ptr,
|
|
access, bInheritHandle, 0))
|
|
{
|
|
printf ( "error getting handle to client (%lu)\n", GetLastError ());
|
|
goto out;
|
|
}
|
|
debug_printf ("Duplicated %p to %p\n", from_handle, *to_handle_ptr);
|
|
|
|
ret_val = 0;
|
|
|
|
out:
|
|
if (local_handle && from_process != GetCurrentProcess ())
|
|
CloseHandle (local_handle);
|
|
|
|
return (ret_val);
|
|
}
|
|
|
|
void
|
|
client_request::serve (transport_layer_base *conn, class process_cache *cache)
|
|
{
|
|
printf ("*****************************************\n"
|
|
"A call to the base client_request class has occured\n"
|
|
"This indicates a mismatch in a virtual function definition somewhere\n");
|
|
exit (1);
|
|
}
|
|
|
|
void
|
|
client_request_attach_tty::serve(transport_layer_base *conn, class process_cache *cache)
|
|
{
|
|
HANDLE from_process_handle = NULL;
|
|
HANDLE to_process_handle = NULL;
|
|
HANDLE token_handle = NULL;
|
|
DWORD rc;
|
|
|
|
if (header.cb != sizeof (req))
|
|
{
|
|
header.error_code = EINVAL;
|
|
return;
|
|
}
|
|
|
|
debug_printf ("pid %ld:(%p,%p) -> pid %ld\n", req.master_pid,
|
|
req.from_master, req.to_master,
|
|
req.pid);
|
|
|
|
debug_printf ("opening process %ld\n", req.master_pid);
|
|
from_process_handle = OpenProcess (PROCESS_DUP_HANDLE, FALSE, req.master_pid);
|
|
debug_printf ("opening process %ld\n", req.pid);
|
|
to_process_handle = OpenProcess (PROCESS_DUP_HANDLE, FALSE, req.pid);
|
|
if (!from_process_handle || !to_process_handle)
|
|
{
|
|
printf ("error opening process (%lu)\n", GetLastError ());
|
|
header.error_code = EACCES;
|
|
goto out;
|
|
}
|
|
|
|
debug_printf ("Impersonating client\n");
|
|
conn->impersonate_client ();
|
|
|
|
debug_printf ("about to open thread token\n");
|
|
rc = OpenThreadToken (GetCurrentThread (),
|
|
TOKEN_QUERY,
|
|
TRUE,
|
|
&token_handle);
|
|
|
|
debug_printf ("opened thread token, rc=%lu\n", rc);
|
|
conn->revert_to_self ();
|
|
|
|
if (!rc)
|
|
{
|
|
printf ("error opening thread token (%lu)\n", GetLastError ());
|
|
header.error_code = EACCES;
|
|
goto out;
|
|
}
|
|
|
|
if (check_and_dup_handle (from_process_handle, to_process_handle,
|
|
token_handle,
|
|
GENERIC_READ,
|
|
req.from_master,
|
|
&req.from_master, TRUE) != 0)
|
|
{
|
|
printf ("error duplicating from_master handle (%lu)\n", GetLastError ());
|
|
header.error_code = EACCES;
|
|
goto out;
|
|
}
|
|
|
|
if (req.to_master)
|
|
{
|
|
if (check_and_dup_handle (from_process_handle, to_process_handle,
|
|
token_handle,
|
|
GENERIC_WRITE,
|
|
req.to_master,
|
|
&req.to_master, TRUE) != 0)
|
|
{
|
|
printf ("error duplicating to_master handle (%lu)\n", GetLastError ());
|
|
header.error_code = EACCES;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
#if DEBUG
|
|
printf ("%ld -> %ld(%p,%p)\n", req.master_pid, req.pid,
|
|
req.from_master, req.to_master);
|
|
#endif
|
|
|
|
header.error_code = 0;
|
|
|
|
out:
|
|
if (from_process_handle)
|
|
CloseHandle (from_process_handle);
|
|
if (to_process_handle)
|
|
CloseHandle (to_process_handle);
|
|
if (token_handle)
|
|
CloseHandle (token_handle);
|
|
}
|
|
|
|
void
|
|
client_request_get_version::serve(transport_layer_base *conn, class process_cache *cache)
|
|
{
|
|
if (header.cb != sizeof (version))
|
|
{
|
|
header.error_code = EINVAL;
|
|
return;
|
|
}
|
|
header.error_code = 0;
|
|
version.major = CYGWIN_SERVER_VERSION_MAJOR;
|
|
version.api = CYGWIN_SERVER_VERSION_API;
|
|
version.minor = CYGWIN_SERVER_VERSION_MINOR;
|
|
version.patch = CYGWIN_SERVER_VERSION_PATCH;
|
|
}
|
|
|
|
class server_request : public queue_request
|
|
{
|
|
public:
|
|
server_request (transport_layer_base *newconn, class process_cache *newcache);
|
|
virtual void process ();
|
|
private:
|
|
char request_buffer [MAX_REQUEST_SIZE];
|
|
transport_layer_base *conn;
|
|
class process_cache *cache;
|
|
};
|
|
|
|
class server_process_param : public queue_process_param
|
|
{
|
|
public:
|
|
transport_layer_base *transport;
|
|
server_process_param () : queue_process_param (false) {};
|
|
};
|
|
|
|
class server_request_queue : public threaded_queue
|
|
{
|
|
public:
|
|
class process_cache *cache;
|
|
void process_requests (transport_layer_base *transport);
|
|
virtual void add (transport_layer_base *conn);
|
|
};
|
|
class server_request_queue request_queue;
|
|
|
|
static DWORD WINAPI
|
|
request_loop (LPVOID LpParam)
|
|
{
|
|
class server_process_param *params = (server_process_param *) LpParam;
|
|
class server_request_queue *queue = (server_request_queue *) params->queue;
|
|
class transport_layer_base * transport = params->transport;
|
|
while (queue->active)
|
|
{
|
|
transport_layer_base * new_conn = transport->accept ();
|
|
/* FIXME: this is a little ugly. What we really want is to wait on two objects:
|
|
* one for the pipe/socket, and one for being told to shutdown. Otherwise
|
|
* this will stay a problem (we won't actually shutdown until the request
|
|
* _AFTER_ the shutdown request. And sending ourselves a request is ugly
|
|
*/
|
|
if (new_conn && queue->active)
|
|
queue->add (new_conn);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* TODO: check we are not being asked to service a already serviced transport */
|
|
void
|
|
server_request_queue::process_requests (transport_layer_base *transport)
|
|
{
|
|
class server_process_param *params = new server_process_param;
|
|
params->transport = transport;
|
|
threaded_queue::process_requests (params, request_loop);
|
|
}
|
|
|
|
void
|
|
client_request_shutdown::serve (transport_layer_base *conn, class process_cache *cache)
|
|
{
|
|
/* FIXME: link upwards, and then this becomes a trivial method call to
|
|
* only shutdown _this queue_
|
|
*/
|
|
/* tell the main thread to shutdown */
|
|
request_queue.active=false;
|
|
}
|
|
|
|
server_request::server_request (transport_layer_base *newconn, class process_cache *newcache)
|
|
{
|
|
conn = newconn;
|
|
cache = newcache;
|
|
}
|
|
|
|
void
|
|
server_request::process ()
|
|
{
|
|
ssize_t bytes_read, bytes_written;
|
|
struct request_header* req_ptr = (struct request_header*) &request_buffer;
|
|
client_request *req = NULL;
|
|
debug_printf ("about to read\n");
|
|
|
|
bytes_read = conn->read (request_buffer, sizeof (struct request_header));
|
|
if (bytes_read != sizeof (struct request_header))
|
|
{
|
|
printf ("error reading from connection (%lu)\n", GetLastError ());
|
|
goto out;
|
|
}
|
|
debug_printf ("got header (%ld)\n", bytes_read);
|
|
|
|
switch (req_ptr->req_id)
|
|
{
|
|
case CYGSERVER_REQUEST_GET_VERSION:
|
|
req = new client_request_get_version (); break;
|
|
case CYGSERVER_REQUEST_ATTACH_TTY:
|
|
req = new client_request_attach_tty (); break;
|
|
case CYGSERVER_REQUEST_SHUTDOWN:
|
|
req = new client_request_shutdown (); break;
|
|
case CYGSERVER_REQUEST_SHM_GET:
|
|
req = new client_request_shm (); break;
|
|
default:
|
|
req = new client_request (CYGSERVER_REQUEST_INVALID, 0);
|
|
req->header.error_code = ENOSYS;
|
|
debug_printf ("Bad client request - returning ENOSYS\n");
|
|
}
|
|
|
|
if (req->header.cb != req_ptr->cb)
|
|
{
|
|
debug_printf ("Mismatch in request buffer sizes\n");
|
|
goto out;
|
|
}
|
|
|
|
if (req->header.cb)
|
|
{
|
|
|
|
bytes_read = conn->read (req->buffer, req->header.cb);
|
|
if (bytes_read != req->header.cb)
|
|
{
|
|
debug_printf ("error reading from connection (%lu)\n", GetLastError ());
|
|
goto out;
|
|
}
|
|
debug_printf ("got body (%ld)\n",bytes_read);
|
|
}
|
|
|
|
/* this is not allowed to fail. We must return ENOSYS at a minimum to the client */
|
|
req->serve (conn, cache);
|
|
|
|
if ((bytes_written = conn->write ((char *)&req->header, sizeof (req->header)))
|
|
!= sizeof(req->header) || (req->header.cb &&
|
|
(bytes_written = conn->write (req->buffer, req->header.cb)) != req->header.cb))
|
|
{
|
|
req->header.error_code = -1;
|
|
printf ("error writing to connection (%lu)\n", GetLastError ());
|
|
goto out;
|
|
}
|
|
|
|
debug_printf("Sent reply, size (%ld)\n",bytes_written);
|
|
printf (".");
|
|
|
|
out:
|
|
conn->close ();
|
|
delete conn;
|
|
if (req)
|
|
delete (req);
|
|
}
|
|
|
|
void
|
|
server_request_queue::add (transport_layer_base *conn)
|
|
{
|
|
/* safe to not "Try" because workers don't hog this, they wait on the event
|
|
*/
|
|
/* every derived ::add must enter the section! */
|
|
EnterCriticalSection (&queuelock);
|
|
if (!running)
|
|
{
|
|
conn->close ();
|
|
delete conn;
|
|
LeaveCriticalSection (&queuelock);
|
|
return;
|
|
}
|
|
queue_request * listrequest = new server_request (conn, cache);
|
|
threaded_queue::add (listrequest);
|
|
LeaveCriticalSection (&queuelock);
|
|
}
|
|
|
|
void
|
|
handle_signal (int signal)
|
|
{
|
|
/* any signal makes us die :} */
|
|
/* FIXME: link upwards, and then this becomes a trivial method call to
|
|
* only shutdown _this queue_
|
|
*/
|
|
/* tell the main thread to shutdown */
|
|
request_queue.active=false;
|
|
}
|
|
|
|
struct option longopts[] = {
|
|
{"shutdown", no_argument, NULL, 's'},
|
|
{0, no_argument, NULL, 0}
|
|
};
|
|
|
|
char opts[] = "s";
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
int shutdown=0;
|
|
char i;
|
|
|
|
while ((i = getopt_long (argc, argv, opts, longopts, NULL)) != EOF)
|
|
switch (i)
|
|
{
|
|
case 's':
|
|
shutdown = 1;
|
|
break;
|
|
default:
|
|
break;
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
wincap.init();
|
|
if (wincap.has_security ())
|
|
setup_privileges ();
|
|
transport = create_server_transport ();
|
|
|
|
if (shutdown)
|
|
{
|
|
if (!transport->connect())
|
|
{
|
|
printf ("couldn't establish connection with server\n");
|
|
exit (1);
|
|
}
|
|
client_request_shutdown *request =
|
|
new client_request_shutdown ();
|
|
request->send (transport);
|
|
transport->close();
|
|
delete transport;
|
|
delete request;
|
|
exit(0);
|
|
}
|
|
|
|
char version[200];
|
|
/* Cygwin dll release */
|
|
snprintf (version, 200, "%d.%d.%d(%d.%d/%d/%d)-(%d.%d.%d.%d) %s",
|
|
cygwin_version.dll_major / 1000,
|
|
cygwin_version.dll_major % 1000,
|
|
cygwin_version.dll_minor,
|
|
cygwin_version.api_major,
|
|
cygwin_version.api_minor,
|
|
cygwin_version.shared_data,
|
|
CYGWIN_SERVER_VERSION_MAJOR,
|
|
CYGWIN_SERVER_VERSION_API,
|
|
CYGWIN_SERVER_VERSION_MINOR,
|
|
CYGWIN_SERVER_VERSION_PATCH,
|
|
cygwin_version.mount_registry,
|
|
cygwin_version.dll_build_date);
|
|
setbuf (stdout, NULL);
|
|
printf ("daemon version %s starting up", version);
|
|
if (signal (SIGQUIT, handle_signal) == SIG_ERR)
|
|
{
|
|
printf ("\ncould not install signal handler (%d)- aborting startup\n", errno);
|
|
exit (1);
|
|
}
|
|
printf (".");
|
|
transport->listen ();
|
|
printf (".");
|
|
class process_cache cache (2);
|
|
request_queue.initial_workers = 10;
|
|
request_queue.cache = &cache;
|
|
request_queue.create_workers ();
|
|
printf (".");
|
|
request_queue.process_requests (transport);
|
|
printf (".");
|
|
cache.create_workers ();
|
|
printf (".");
|
|
cache.process_requests ();
|
|
printf (".complete\n");
|
|
/* TODO: wait on multiple objects - the thread handle for each request loop +
|
|
* all the process handles. This should be done by querying the request_queue and
|
|
* the process cache for all their handles, and then waiting for (say) 30 seconds.
|
|
* after that we recreate the list of handles to wait on, and wait again.
|
|
* the point of all this abstraction is that we can trivially server both sockets
|
|
* and pipes simply by making a new transport, and then calling
|
|
* request_queue.process_requests (transport2);
|
|
*/
|
|
/* WaitForMultipleObjects abort && request_queue && process_queue && signal
|
|
-- if signal event then retrigger it
|
|
*/
|
|
while (1 && request_queue.active)
|
|
{
|
|
sleep (1);
|
|
}
|
|
printf ("\nShutdown request recieved - new requests will be denied\n");
|
|
request_queue.cleanup ();
|
|
printf ("All pending requests processed\n");
|
|
transport->close ();
|
|
printf ("No longer accepting requests - cygwin will operate in daemonless mode\n");
|
|
cache.cleanup ();
|
|
printf ("All outstanding process-cache activities completed\n");
|
|
printf ("daemon shutdown\n");
|
|
}
|