server/request.c

   1 /*
   2  * Server-side request handling
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #ifdef HAVE_PWD_H
  28 #include <pwd.h>
  29 #endif
  30 #include <signal.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <stdarg.h>
  34 #include <string.h>
  35 #include <sys/stat.h>
  36 #include <sys/time.h>
  37 #include <sys/types.h>
  38 #ifdef HAVE_SYS_SOCKET_H
  39 # include <sys/socket.h>
  40 #endif
  41 #ifdef HAVE_SYS_WAIT_H
  42 # include <sys/wait.h>
  43 #endif
  44 #ifdef HAVE_SYS_UIO_H
  45 #include <sys/uio.h>
  46 #endif
  47 #ifdef HAVE_SYS_UN_H
  48 #include <sys/un.h>
  49 #endif
  50 #include <unistd.h>
  51 #ifdef HAVE_POLL_H
  52 #include <poll.h>
  53 #endif
  54 #ifdef __APPLE__
  55 # include <mach/mach_time.h>
  56 #endif
  57
  58 #include "ntstatus.h"
  59 #define WIN32_NO_STATUS
  60 #include "windef.h"
  61 #include "winbase.h"
  62 #include "wincon.h"
  63 #include "winternl.h"
  64
  65 #include "file.h"
  66 #include "process.h"
  67 #include "thread.h"
  68 #include "security.h"
  69 #include "handle.h"
  70 #define WANT_REQUEST_HANDLERS
  71 #include "request.h"
  72
  73 /* Some versions of glibc don't define this */
  74 #ifndef SCM_RIGHTS
  75 #define SCM_RIGHTS 1
  76 #endif
  77
  78 /* path names for server master Unix socket */
  79 static const char * const server_socket_name = "socket";   /* name of the socket file */
  80 static const char * const server_lock_name = "lock";       /* name of the server lock file */
  81
  82 struct master_socket
  83 {
  84     struct object        obj;        /* object header */
  85     struct fd           *fd;         /* file descriptor of the master socket */
  86 };
  87
  88 static void master_socket_dump( struct object *obj, int verbose );
  89 static void master_socket_destroy( struct object *obj );
  90 static void master_socket_poll_event( struct fd *fd, int event );
  91
  92 static const struct object_ops master_socket_ops =
  93 {
  94     sizeof(struct master_socket),  /* size */
  95     &no_type,                      /* type */
  96     master_socket_dump,            /* dump */
  97     no_add_queue,                  /* add_queue */
  98     NULL,                          /* remove_queue */
  99     NULL,                          /* signaled */
 100     NULL,                          /* satisfied */
 101     no_signal,                     /* signal */
 102     no_get_fd,                     /* get_fd */
 103     default_map_access,            /* map_access */
 104     default_get_sd,                /* get_sd */
 105     default_set_sd,                /* set_sd */
 106     no_get_full_name,              /* get_full_name */
 107     no_lookup_name,                /* lookup_name */
 108     no_link_name,                  /* link_name */
 109     NULL,                          /* unlink_name */
 110     no_open_file,                  /* open_file */
 111     no_kernel_obj_list,            /* get_kernel_obj_list */
 112     no_close_handle,               /* close_handle */
 113     master_socket_destroy          /* destroy */
 114 };
 115
 116 static const struct fd_ops master_socket_fd_ops =
 117 {
 118     NULL,                          /* get_poll_events */
 119     master_socket_poll_event,      /* poll_event */
 120     NULL,                          /* flush */
 121     NULL,                          /* get_fd_type */
 122     NULL,                          /* ioctl */
 123     NULL,                          /* queue_async */
 124     NULL                           /* reselect_async */
 125 };
 126
 127
 128 struct thread *current = NULL;  /* thread handling the current request */
 129 unsigned int global_error = 0;  /* global error code for when no thread is current */
 130 timeout_t server_start_time = 0;  /* server startup time */
 131 char *server_dir = NULL;   /* server directory */
 132 int server_dir_fd = -1;    /* file descriptor for the server dir */
 133 int config_dir_fd = -1;    /* file descriptor for the config dir */
 134
 135 static struct master_socket *master_socket;  /* the master socket object */
 136 static struct timeout_user *master_timeout;
 137
 138 /* complain about a protocol error and terminate the client connection */
 139 void fatal_protocol_error( struct thread *thread, const char *err, ... )
 140 {
 141     va_list args;
 142
 143     va_start( args, err );
 144     fprintf( stderr, "Protocol error:%04x: ", thread->id );
 145     vfprintf( stderr, err, args );
 146     va_end( args );
 147     thread->exit_code = 1;
 148     kill_thread( thread, 1 );
 149 }
 150
 151 /* die on a fatal error */
 152 void fatal_error( const char *err, ... )
 153 {
 154     va_list args;
 155
 156     va_start( args, err );
 157     fprintf( stderr, "wineserver: " );
 158     vfprintf( stderr, err, args );
 159     va_end( args );
 160     exit(1);
 161 }
 162
 163 /* allocate the reply data */
 164 void *set_reply_data_size( data_size_t size )
 165 {
 166     assert( size <= get_reply_max_size() );
 167     if (size && !(current->reply_data = mem_alloc( size ))) size = 0;
 168     current->reply_size = size;
 169     return current->reply_data;
 170 }
 171
 172 static const struct object_attributes empty_attributes;
 173
 174 /* return object attributes from the current request */
 175 const struct object_attributes *get_req_object_attributes( const struct security_descriptor **sd,
 176                                                            struct unicode_str *name,
 177                                                            struct object **root )
 178 {
 179     const struct object_attributes *attr = get_req_data();
 180     data_size_t size = get_req_data_size();
 181
 182     if (root) *root = NULL;
 183
 184     if (!size)
 185     {
 186         *sd = NULL;
 187         name->len = 0;
 188         return &empty_attributes;
 189     }
 190
 191     if ((size < sizeof(*attr)) || (size - sizeof(*attr) < attr->sd_len) ||
 192         (size - sizeof(*attr) - attr->sd_len < attr->name_len))
 193     {
 194         set_error( STATUS_ACCESS_VIOLATION );
 195         return NULL;
 196     }
 197     if (attr->sd_len && !sd_is_valid( (const struct security_descriptor *)(attr + 1), attr->sd_len ))
 198     {
 199         set_error( STATUS_INVALID_SECURITY_DESCR );
 200         return NULL;
 201     }
 202     if ((attr->name_len & (sizeof(WCHAR) - 1)) || attr->name_len >= 65534)
 203     {
 204         set_error( STATUS_OBJECT_NAME_INVALID );
 205         return NULL;
 206     }
 207     if (root && attr->rootdir && attr->name_len)
 208     {
 209         if (!(*root = get_handle_obj( current->process, attr->rootdir, 0, NULL ))) return NULL;
 210     }
 211     *sd = attr->sd_len ? (const struct security_descriptor *)(attr + 1) : NULL;
 212     name->len = attr->name_len;
 213     name->str = (const WCHAR *)(attr + 1) + attr->sd_len / sizeof(WCHAR);
 214     return attr;
 215 }
 216
 217 /* return a pointer to the request data following an object attributes structure */
 218 const void *get_req_data_after_objattr( const struct object_attributes *attr, data_size_t *len )
 219 {
 220     data_size_t size = (sizeof(*attr) + (attr->sd_len & ~1) + (attr->name_len & ~1) + 3) & ~3;
 221
 222     if (attr == &empty_attributes || size >= get_req_data_size())
 223     {
 224         *len = 0;
 225         return NULL;
 226     }
 227     *len = get_req_data_size() - size;
 228     return (const char *)get_req_data() + size;
 229 }
 230
 231 /* write the remaining part of the reply */
 232 void write_reply( struct thread *thread )
 233 {
 234     int ret;
 235
 236     if ((ret = write( get_unix_fd( thread->reply_fd ),
 237                       (char *)thread->reply_data + thread->reply_size - thread->reply_towrite,
 238                       thread->reply_towrite )) >= 0)
 239     {
 240         if (!(thread->reply_towrite -= ret))
 241         {
 242             free( thread->reply_data );
 243             thread->reply_data = NULL;
 244             /* sent everything, can go back to waiting for requests */
 245             set_fd_events( thread->request_fd, POLLIN );
 246             set_fd_events( thread->reply_fd, 0 );
 247         }
 248         return;
 249     }
 250     if (errno == EPIPE)
 251         kill_thread( thread, 0 );  /* normal death */
 252     else if (errno != EWOULDBLOCK && (EWOULDBLOCK == EAGAIN || errno != EAGAIN))
 253         fatal_protocol_error( thread, "reply write: %s\n", strerror( errno ));
 254 }
 255
 256 /* send a reply to the current thread */
 257 static void send_reply( union generic_reply *reply )
 258 {
 259     int ret;
 260
 261     if (!current->reply_size)
 262     {
 263         if ((ret = write( get_unix_fd( current->reply_fd ),
 264                           reply, sizeof(*reply) )) != sizeof(*reply)) goto error;
 265     }
 266     else
 267     {
 268         struct iovec vec[2];
 269
 270         vec[0].iov_base = (void *)reply;
 271         vec[0].iov_len  = sizeof(*reply);
 272         vec[1].iov_base = current->reply_data;
 273         vec[1].iov_len  = current->reply_size;
 274
 275         if ((ret = writev( get_unix_fd( current->reply_fd ), vec, 2 )) < sizeof(*reply)) goto error;
 276
 277         if ((current->reply_towrite = current->reply_size - (ret - sizeof(*reply))))
 278         {
 279             /* couldn't write it all, wait for POLLOUT */
 280             set_fd_events( current->reply_fd, POLLOUT );
 281             set_fd_events( current->request_fd, 0 );
 282             return;
 283         }
 284     }
 285     free( current->reply_data );
 286     current->reply_data = NULL;
 287     return;
 288
 289  error:
 290     if (ret >= 0)
 291         fatal_protocol_error( current, "partial write %d\n", ret );
 292     else if (errno == EPIPE)
 293         kill_thread( current, 0 );  /* normal death */
 294     else
 295         fatal_protocol_error( current, "reply write: %s\n", strerror( errno ));
 296 }
 297
 298 /* call a request handler */
 299 static void call_req_handler( struct thread *thread )
 300 {
 301     union generic_reply reply;
 302     enum request req = thread->req.request_header.req;
 303
 304     current = thread;
 305     current->reply_size = 0;
 306     clear_error();
 307     memset( &reply, 0, sizeof(reply) );
 308
 309     if (debug_level) trace_request();
 310
 311     if (req < REQ_NB_REQUESTS)
 312         req_handlers[req]( &current->req, &reply );
 313     else
 314         set_error( STATUS_NOT_IMPLEMENTED );
 315
 316     if (current)
 317     {
 318         if (current->reply_fd)
 319         {
 320             reply.reply_header.error = current->error;
 321             reply.reply_header.reply_size = current->reply_size;
 322             if (debug_level) trace_reply( req, &reply );
 323             send_reply( &reply );
 324         }
 325         else
 326         {
 327             current->exit_code = 1;
 328             kill_thread( current, 1 );  /* no way to continue without reply fd */
 329         }
 330     }
 331     current = NULL;
 332 }
 333
 334 /* read a request from a thread */
 335 void read_request( struct thread *thread )
 336 {
 337     int ret;
 338
 339     if (!thread->req_toread)  /* no pending request */
 340     {
 341         if ((ret = read( get_unix_fd( thread->request_fd ), &thread->req,
 342                          sizeof(thread->req) )) != sizeof(thread->req)) goto error;
 343         if (!(thread->req_toread = thread->req.request_header.request_size))
 344         {
 345             /* no data, handle request at once */
 346             call_req_handler( thread );
 347             return;
 348         }
 349         if (!(thread->req_data = malloc( thread->req_toread )))
 350         {
 351             fatal_protocol_error( thread, "no memory for %u bytes request %d\n",
 352                                   thread->req_toread, thread->req.request_header.req );
 353             return;
 354         }
 355     }
 356
 357     /* read the variable sized data */
 358     for (;;)
 359     {
 360         ret = read( get_unix_fd( thread->request_fd ),
 361                     (char *)thread->req_data + thread->req.request_header.request_size
 362                       - thread->req_toread,
 363                     thread->req_toread );
 364         if (ret <= 0) break;
 365         if (!(thread->req_toread -= ret))
 366         {
 367             call_req_handler( thread );
 368             free( thread->req_data );
 369             thread->req_data = NULL;
 370             return;
 371         }
 372     }
 373
 374 error:
 375     if (!ret)  /* closed pipe */
 376         kill_thread( thread, 0 );
 377     else if (ret > 0)
 378         fatal_protocol_error( thread, "partial read %d\n", ret );
 379     else if (errno != EWOULDBLOCK && (EWOULDBLOCK == EAGAIN || errno != EAGAIN))
 380         fatal_protocol_error( thread, "read: %s\n", strerror( errno ));
 381 }
 382
 383 /* receive a file descriptor on the process socket */
 384 int receive_fd( struct process *process )
 385 {
 386     struct iovec vec;
 387     struct send_fd data;
 388     struct msghdr msghdr;
 389     int fd = -1, ret;
 390
 391 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 392     msghdr.msg_accrightslen = sizeof(int);
 393     msghdr.msg_accrights = (void *)&fd;
 394 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 395     char cmsg_buffer[256];
 396     msghdr.msg_control    = cmsg_buffer;
 397     msghdr.msg_controllen = sizeof(cmsg_buffer);
 398     msghdr.msg_flags      = 0;
 399 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 400
 401     msghdr.msg_name    = NULL;
 402     msghdr.msg_namelen = 0;
 403     msghdr.msg_iov     = &vec;
 404     msghdr.msg_iovlen  = 1;
 405     vec.iov_base = (void *)&data;
 406     vec.iov_len  = sizeof(data);
 407
 408     ret = recvmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 409
 410 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 411     if (ret > 0)
 412     {
 413         struct cmsghdr *cmsg;
 414         for (cmsg = CMSG_FIRSTHDR( &msghdr ); cmsg; cmsg = CMSG_NXTHDR( &msghdr, cmsg ))
 415         {
 416             if (cmsg->cmsg_level != SOL_SOCKET) continue;
 417             if (cmsg->cmsg_type == SCM_RIGHTS) fd = *(int *)CMSG_DATA(cmsg);
 418         }
 419     }
 420 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 421
 422     if (ret == sizeof(data))
 423     {
 424         struct thread *thread;
 425
 426         if (data.tid) thread = get_thread_from_id( data.tid );
 427         else thread = (struct thread *)grab_object( get_process_first_thread( process ));
 428
 429         if (!thread || thread->process != process || thread->state == TERMINATED)
 430         {
 431             if (debug_level)
 432                 fprintf( stderr, "%04x: *fd* %d <- %d bad thread id\n",
 433                          data.tid, data.fd, fd );
 434             close( fd );
 435         }
 436         else
 437         {
 438             if (debug_level)
 439                 fprintf( stderr, "%04x: *fd* %d <- %d\n",
 440                          thread->id, data.fd, fd );
 441             thread_add_inflight_fd( thread, data.fd, fd );
 442         }
 443         if (thread) release_object( thread );
 444         return 0;
 445     }
 446
 447     if (!ret)
 448     {
 449         kill_process( process, 0 );
 450     }
 451     else if (ret > 0)
 452     {
 453         fprintf( stderr, "Protocol error: process %04x: partial recvmsg %d for fd\n",
 454                  process->id, ret );
 455         if (fd != -1) close( fd );
 456         kill_process( process, 1 );
 457     }
 458     else
 459     {
 460         if (errno != EWOULDBLOCK && (EWOULDBLOCK == EAGAIN || errno != EAGAIN))
 461         {
 462             fprintf( stderr, "Protocol error: process %04x: ", process->id );
 463             perror( "recvmsg" );
 464             kill_process( process, 1 );
 465         }
 466     }
 467     return -1;
 468 }
 469
 470 /* send an fd to a client */
 471 int send_client_fd( struct process *process, int fd, obj_handle_t handle )
 472 {
 473     struct iovec vec;
 474     struct msghdr msghdr;
 475     int ret;
 476
 477 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 478     msghdr.msg_accrightslen = sizeof(fd);
 479     msghdr.msg_accrights = (void *)&fd;
 480 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 481     char cmsg_buffer[256];
 482     struct cmsghdr *cmsg;
 483     msghdr.msg_control    = cmsg_buffer;
 484     msghdr.msg_controllen = sizeof(cmsg_buffer);
 485     msghdr.msg_flags      = 0;
 486     cmsg = CMSG_FIRSTHDR( &msghdr );
 487     cmsg->cmsg_len   = CMSG_LEN( sizeof(fd) );
 488     cmsg->cmsg_level = SOL_SOCKET;
 489     cmsg->cmsg_type  = SCM_RIGHTS;
 490     *(int *)CMSG_DATA(cmsg) = fd;
 491     msghdr.msg_controllen = cmsg->cmsg_len;
 492 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 493
 494     msghdr.msg_name    = NULL;
 495     msghdr.msg_namelen = 0;
 496     msghdr.msg_iov     = &vec;
 497     msghdr.msg_iovlen  = 1;
 498
 499     vec.iov_base = (void *)&handle;
 500     vec.iov_len  = sizeof(handle);
 501
 502     if (debug_level)
 503         fprintf( stderr, "%04x: *fd* %04x -> %d\n", current ? current->id : process->id, handle, fd );
 504
 505     ret = sendmsg( get_unix_fd( process->msg_fd ), &msghdr, 0 );
 506
 507     if (ret == sizeof(handle)) return 0;
 508
 509     if (ret >= 0)
 510     {
 511         fprintf( stderr, "Protocol error: process %04x: partial sendmsg %d\n", process->id, ret );
 512         kill_process( process, 1 );
 513     }
 514     else if (errno == EPIPE)
 515     {
 516         kill_process( process, 0 );
 517     }
 518     else
 519     {
 520         fprintf( stderr, "Protocol error: process %04x: ", process->id );
 521         perror( "sendmsg" );
 522         kill_process( process, 1 );
 523     }
 524     return -1;
 525 }
 526
 527 /* return a monotonic time counter */
 528 timeout_t monotonic_counter(void)
 529 {
 530 #ifdef __APPLE__
 531     static mach_timebase_info_data_t timebase;
 532
 533     if (!timebase.denom) mach_timebase_info( &timebase );
 534 #ifdef HAVE_MACH_CONTINUOUS_TIME
 535     if (&mach_continuous_time != NULL)
 536         return mach_continuous_time() * timebase.numer / timebase.denom / 100;
 537 #endif
 538     return mach_absolute_time() * timebase.numer / timebase.denom / 100;
 539 #elif defined(HAVE_CLOCK_GETTIME)
 540     struct timespec ts;
 541 #ifdef CLOCK_MONOTONIC_RAW
 542     if (!clock_gettime( CLOCK_MONOTONIC_RAW, &ts ))
 543         return (timeout_t)ts.tv_sec * TICKS_PER_SEC + ts.tv_nsec / 100;
 544 #endif
 545     if (!clock_gettime( CLOCK_MONOTONIC, &ts ))
 546         return (timeout_t)ts.tv_sec * TICKS_PER_SEC + ts.tv_nsec / 100;
 547 #endif
 548     return current_time - server_start_time;
 549 }
 550
 551 static void master_socket_dump( struct object *obj, int verbose )
 552 {
 553     struct master_socket *sock = (struct master_socket *)obj;
 554     assert( obj->ops == &master_socket_ops );
 555     fprintf( stderr, "Master socket fd=%p\n", sock->fd );
 556 }
 557
 558 static void master_socket_destroy( struct object *obj )
 559 {
 560     struct master_socket *sock = (struct master_socket *)obj;
 561     assert( obj->ops == &master_socket_ops );
 562     release_object( sock->fd );
 563 }
 564
 565 /* handle a socket event */
 566 static void master_socket_poll_event( struct fd *fd, int event )
 567 {
 568     struct master_socket *sock = get_fd_user( fd );
 569     assert( master_socket->obj.ops == &master_socket_ops );
 570
 571     assert( sock == master_socket );  /* there is only one master socket */
 572
 573     if (event & (POLLERR | POLLHUP))
 574     {
 575         /* this is not supposed to happen */
 576         fprintf( stderr, "wineserver: Error on master socket\n" );
 577         set_fd_events( sock->fd, -1 );
 578     }
 579     else if (event & POLLIN)
 580     {
 581         struct process *process;
 582         struct sockaddr_un dummy;
 583         socklen_t len = sizeof(dummy);
 584         int client = accept( get_unix_fd( master_socket->fd ), (struct sockaddr *) &dummy, &len );
 585         if (client == -1) return;
 586         fcntl( client, F_SETFL, O_NONBLOCK );
 587         if ((process = create_process( client, NULL, 0, NULL, NULL, NULL, 0, NULL )))
 588         {
 589             create_thread( -1, process, NULL );
 590             release_object( process );
 591         }
 592     }
 593 }
 594
 595 /* remove the socket upon exit */
 596 static void socket_cleanup(void)
 597 {
 598     static int do_it_once;
 599     if (!do_it_once++) unlink( server_socket_name );
 600 }
 601
 602 /* create a directory and check its permissions */
 603 static void create_dir( const char *name, struct stat *st )
 604 {
 605     if (lstat( name, st ) == -1)
 606     {
 607         if (errno != ENOENT)
 608             fatal_error( "lstat %s: %s\n", name, strerror( errno ));
 609         if (mkdir( name, 0700 ) == -1 && errno != EEXIST)
 610             fatal_error( "mkdir %s: %s\n", name, strerror( errno ));
 611         if (lstat( name, st ) == -1)
 612             fatal_error( "lstat %s: %s\n", name, strerror( errno ));
 613     }
 614     if (!S_ISDIR(st->st_mode)) fatal_error( "%s is not a directory\n", name );
 615     if (st->st_uid != getuid()) fatal_error( "%s is not owned by you\n", name );
 616     if (st->st_mode & 077) fatal_error( "%s must not be accessible by other users\n", name );
 617 }
 618
 619 /* create the server directory and chdir to it */
 620 static char *create_server_dir( int force )
 621 {
 622     const char *prefix = getenv( "WINEPREFIX" );
 623     char *p, *config_dir;
 624     struct stat st, st2;
 625     size_t len = sizeof("/server-") + 2 * sizeof(st.st_dev) + 2 * sizeof(st.st_ino) + 2;
 626
 627     /* open the configuration directory */
 628
 629     if (prefix)
 630     {
 631         if (!(config_dir = strdup( prefix ))) fatal_error( "out of memory\n" );
 632         for (p = config_dir + strlen(config_dir); p > config_dir; p--) if (p[-1] != '/') break;
 633         if (p > config_dir) *p = 0;
 634         if (config_dir[0] != '/')
 635             fatal_error( "invalid directory %s in WINEPREFIX: not an absolute path\n", prefix );
 636     }
 637     else
 638     {
 639         const char *home = getenv( "HOME" );
 640         if (!home)
 641         {
 642             struct passwd *pwd = getpwuid( getuid() );
 643             if (pwd) home = pwd->pw_dir;
 644         }
 645         if (!home) fatal_error( "could not determine your home directory\n" );
 646         if (home[0] != '/') fatal_error( "your home directory %s is not an absolute path\n", home );
 647         if (!(config_dir = malloc( strlen(home) + sizeof("/.wine") ))) fatal_error( "out of memory\n" );
 648         strcpy( config_dir, home );
 649         for (p = config_dir + strlen(config_dir); p > config_dir; p--) if (p[-1] != '/') break;
 650         strcpy( p, "/.wine" );
 651     }
 652
 653     if (chdir( config_dir ) == -1)
 654     {
 655         if (errno != ENOENT || force) fatal_error( "chdir to %s: %s\n", config_dir, strerror( errno ));
 656         return NULL;
 657     }
 658     if ((config_dir_fd = open( ".", O_RDONLY )) == -1)
 659         fatal_error( "open %s: %s\n", config_dir, strerror( errno ));
 660     if (fstat( config_dir_fd, &st ) == -1)
 661         fatal_error( "stat %s: %s\n", config_dir, strerror( errno ));
 662     if (st.st_uid != getuid())
 663         fatal_error( "%s is not owned by you\n", config_dir );
 664
 665     /* create the base directory if needed */
 666
 667 #ifdef __ANDROID__  /* there's no /tmp dir on Android */
 668     len += strlen( config_dir ) + sizeof("/.wineserver");
 669     if (!(server_dir = malloc( len ))) fatal_error( "out of memory\n" );
 670     strcpy( server_dir, config_dir );
 671     strcat( server_dir, "/.wineserver" );
 672 #else
 673     len += sizeof("/tmp/.wine-") + 12;
 674     if (!(server_dir = malloc( len ))) fatal_error( "out of memory\n" );
 675     sprintf( server_dir, "/tmp/.wine-%u", getuid() );
 676 #endif
 677     create_dir( server_dir, &st2 );
 678
 679     /* now create the server directory */
 680
 681     strcat( server_dir, "/server-" );
 682     p = server_dir + strlen(server_dir);
 683
 684     if (st.st_dev != (unsigned long)st.st_dev)
 685         p += sprintf( p, "%lx%08lx-", (unsigned long)((unsigned long long)st.st_dev >> 32),
 686                       (unsigned long)st.st_dev );
 687     else
 688         p += sprintf( p, "%lx-", (unsigned long)st.st_dev );
 689
 690     if (st.st_ino != (unsigned long)st.st_ino)
 691         sprintf( p, "%lx%08lx", (unsigned long)((unsigned long long)st.st_ino >> 32),
 692                  (unsigned long)st.st_ino );
 693     else
 694         sprintf( p, "%lx", (unsigned long)st.st_ino );
 695
 696     create_dir( server_dir, &st );
 697
 698     if (chdir( server_dir ) == -1)
 699         fatal_error( "chdir %s: %s\n", server_dir, strerror( errno ));
 700     if ((server_dir_fd = open( ".", O_RDONLY )) == -1)
 701         fatal_error( "open %s: %s\n", server_dir, strerror( errno ));
 702     if (fstat( server_dir_fd, &st2 ) == -1)
 703         fatal_error( "stat %s: %s\n", server_dir, strerror( errno ));
 704     if (st.st_dev != st2.st_dev || st.st_ino != st2.st_ino)
 705         fatal_error( "chdir did not end up in %s\n", server_dir );
 706
 707     free( config_dir );
 708     return server_dir;
 709 }
 710
 711 /* create the lock file and return its file descriptor */
 712 static int create_server_lock(void)
 713 {
 714     struct stat st;
 715     int fd;
 716
 717     if (lstat( server_lock_name, &st ) == -1)
 718     {
 719         if (errno != ENOENT)
 720             fatal_error( "lstat %s/%s: %s\n", server_dir, server_lock_name, strerror( errno ));
 721     }
 722     else
 723     {
 724         if (!S_ISREG(st.st_mode))
 725             fatal_error( "%s/%s is not a regular file\n", server_dir, server_lock_name );
 726     }
 727
 728     if ((fd = open( server_lock_name, O_CREAT|O_TRUNC|O_WRONLY, 0600 )) == -1)
 729         fatal_error( "error creating %s/%s: %s\n", server_dir, server_lock_name, strerror( errno ));
 730     return fd;
 731 }
 732
 733 /* wait for the server lock */
 734 int wait_for_lock(void)
 735 {
 736     int fd, r;
 737     struct flock fl;
 738
 739     server_dir = create_server_dir( 0 );
 740     if (!server_dir) return 0;  /* no server dir, so no lock to wait on */
 741
 742     fd = create_server_lock();
 743
 744     fl.l_type   = F_WRLCK;
 745     fl.l_whence = SEEK_SET;
 746     fl.l_start  = 0;
 747     fl.l_len    = 1;
 748     r = fcntl( fd, F_SETLKW, &fl );
 749     close(fd);
 750
 751     return r;
 752 }
 753
 754 /* kill the wine server holding the lock */
 755 int kill_lock_owner( int sig )
 756 {
 757     int fd, i, ret = 0;
 758     pid_t pid = 0;
 759     struct flock fl;
 760
 761     server_dir = create_server_dir( 0 );
 762     if (!server_dir) return 0;  /* no server dir, nothing to do */
 763
 764     fd = create_server_lock();
 765
 766     for (i = 1; i <= 20; i++)
 767     {
 768         fl.l_type   = F_WRLCK;
 769         fl.l_whence = SEEK_SET;
 770         fl.l_start  = 0;
 771         fl.l_len    = 1;
 772         if (fcntl( fd, F_GETLK, &fl ) == -1) goto done;
 773         if (fl.l_type != F_WRLCK) goto done;  /* the file is not locked */
 774         if (!pid)  /* first time around */
 775         {
 776             if (!(pid = fl.l_pid)) goto done;  /* shouldn't happen */
 777             if (sig == -1)
 778             {
 779                 if (kill( pid, SIGINT ) == -1) goto done;
 780                 kill( pid, SIGCONT );
 781                 ret = 1;
 782             }
 783             else  /* just send the specified signal and return */
 784             {
 785                 ret = (kill( pid, sig ) != -1);
 786                 goto done;
 787             }
 788         }
 789         else if (fl.l_pid != pid) goto done;  /* no longer the same process */
 790         usleep( 50000 * i );
 791     }
 792     /* waited long enough, now kill it */
 793     kill( pid, SIGKILL );
 794
 795  done:
 796     close( fd );
 797     return ret;
 798 }
 799
 800 /* acquire the main server lock */
 801 static void acquire_lock(void)
 802 {
 803     struct sockaddr_un addr;
 804     struct stat st;
 805     struct flock fl;
 806     int fd, slen, got_lock = 0;
 807
 808     fd = create_server_lock();
 809
 810     fl.l_type   = F_WRLCK;
 811     fl.l_whence = SEEK_SET;
 812     fl.l_start  = 0;
 813     fl.l_len    = 1;
 814     if (fcntl( fd, F_SETLK, &fl ) != -1)
 815     {
 816         /* check for crashed server */
 817         if (stat( server_socket_name, &st ) != -1 &&   /* there is a leftover socket */
 818             stat( "core", &st ) != -1 && st.st_size)   /* and there is a non-empty core file */
 819         {
 820             fprintf( stderr,
 821                      "Warning: a previous instance of the wine server seems to have crashed.\n"
 822                      "Please run 'gdb %s %s/core',\n"
 823                      "type 'backtrace' at the gdb prompt and report the results. Thanks.\n\n",
 824                      server_argv0, server_dir );
 825         }
 826         unlink( server_socket_name ); /* we got the lock, we can safely remove the socket */
 827         got_lock = 1;
 828         /* in that case we reuse fd without closing it, this ensures
 829          * that we hold the lock until the process exits */
 830     }
 831     else
 832     {
 833         switch(errno)
 834         {
 835         case ENOLCK:
 836             break;
 837         case EACCES:
 838             /* check whether locks work at all on this file system */
 839             if (fcntl( fd, F_GETLK, &fl ) == -1) break;
 840             /* fall through */
 841         case EAGAIN:
 842             exit(2); /* we didn't get the lock, exit with special status */
 843         default:
 844             fatal_error( "fcntl %s/%s: %s\n", server_dir, server_lock_name, strerror( errno ));
 845         }
 846         /* it seems we can't use locks on this fs, so we will use the socket existence as lock */
 847         close( fd );
 848     }
 849
 850     if ((fd = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_error( "socket: %s\n", strerror( errno ));
 851     addr.sun_family = AF_UNIX;
 852     strcpy( addr.sun_path, server_socket_name );
 853     slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 854 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 855     addr.sun_len = slen;
 856 #endif
 857     if (bind( fd, (struct sockaddr *)&addr, slen ) == -1)
 858     {
 859         if ((errno == EEXIST) || (errno == EADDRINUSE))
 860         {
 861             if (got_lock)
 862                 fatal_error( "couldn't bind to the socket even though we hold the lock\n" );
 863             exit(2); /* we didn't get the lock, exit with special status */
 864         }
 865         fatal_error( "bind: %s\n", strerror( errno ));
 866     }
 867     atexit( socket_cleanup );
 868     chmod( server_socket_name, 0600 );  /* make sure no other user can connect */
 869     if (listen( fd, 5 ) == -1) fatal_error( "listen: %s\n", strerror( errno ));
 870
 871     if (!(master_socket = alloc_object( &master_socket_ops )) ||
 872         !(master_socket->fd = create_anonymous_fd( &master_socket_fd_ops, fd, &master_socket->obj, 0 )))
 873         fatal_error( "out of memory\n" );
 874     set_fd_events( master_socket->fd, POLLIN );
 875     make_object_permanent( &master_socket->obj );
 876 }
 877
 878 /* open the master server socket and start waiting for new clients */
 879 void open_master_socket(void)
 880 {
 881     int fd, pid, status, sync_pipe[2];
 882     char dummy;
 883
 884     /* make sure no request is larger than the maximum size */
 885     assert( sizeof(union generic_request) == sizeof(struct request_max_size) );
 886     assert( sizeof(union generic_reply) == sizeof(struct request_max_size) );
 887
 888     /* make sure the stdio fds are open */
 889     fd = open( "/dev/null", O_RDWR );
 890     while (fd >= 0 && fd <= 2) fd = dup( fd );
 891
 892     server_dir = create_server_dir( 1 );
 893
 894     if (!foreground)
 895     {
 896         if (pipe( sync_pipe ) == -1) fatal_error( "pipe: %s\n", strerror( errno ));
 897         pid = fork();
 898         switch( pid )
 899         {
 900         case 0:  /* child */
 901             setsid();
 902             close( sync_pipe[0] );
 903
 904             acquire_lock();
 905
 906             /* close stdin and stdout */
 907             dup2( fd, 0 );
 908             dup2( fd, 1 );
 909
 910             /* signal parent */
 911             dummy = 0;
 912             write( sync_pipe[1], &dummy, 1 );
 913             close( sync_pipe[1] );
 914             break;
 915
 916         case -1:
 917             fatal_error( "fork: %s\n", strerror( errno ));
 918             break;
 919
 920         default:  /* parent */
 921             close( sync_pipe[1] );
 922
 923             /* wait for child to signal us and then exit */
 924             if (read( sync_pipe[0], &dummy, 1 ) == 1) _exit(0);
 925
 926             /* child terminated, propagate exit status */
 927             waitpid( pid, &status, 0 );
 928             if (WIFEXITED(status)) _exit( WEXITSTATUS(status) );
 929             _exit(1);
 930         }
 931     }
 932     else  /* remain in the foreground */
 933     {
 934         acquire_lock();
 935     }
 936
 937     /* init the process tracing mechanism */
 938     init_tracing_mechanism();
 939     close( fd );
 940 }
 941
 942 /* master socket timer expiration handler */
 943 static void close_socket_timeout( void *arg )
 944 {
 945     master_timeout = NULL;
 946     flush_registry();
 947     if (debug_level) fprintf( stderr, "wineserver: exiting (pid=%ld)\n", (long) getpid() );
 948
 949 #ifdef DEBUG_OBJECTS
 950     close_objects();  /* shut down everything properly */
 951 #endif
 952     exit( 0 );
 953 }
 954
 955 /* close the master socket and stop waiting for new clients */
 956 void close_master_socket( timeout_t timeout )
 957 {
 958     if (master_socket)
 959     {
 960         release_object( master_socket );
 961         master_socket = NULL;
 962     }
 963     if (master_timeout)  /* cancel previous timeout */
 964         remove_timeout_user( master_timeout );
 965
 966     master_timeout = add_timeout_user( timeout, close_socket_timeout, NULL );
 967 }