dlls/ntdll/server.c

   1 /*
   2  * Wine server communication
   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 <ctype.h>
  26 #ifdef HAVE_DIRENT_H
  27 # include <dirent.h>
  28 #endif
  29 #include <errno.h>
  30 #include <fcntl.h>
  31 #include <signal.h>
  32 #include <stdarg.h>
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <sys/types.h>
  36 #ifdef HAVE_SYS_SOCKET_H
  37 # include <sys/socket.h>
  38 #endif
  39 #ifdef HAVE_SYS_WAIT_H
  40 #include <sys/wait.h>
  41 #endif
  42 #ifdef HAVE_SYS_UN_H
  43 #include <sys/un.h>
  44 #endif
  45 #ifdef HAVE_SYS_MMAN_H
  46 #include <sys/mman.h>
  47 #endif
  48 #ifdef HAVE_SYS_STAT_H
  49 # include <sys/stat.h>
  50 #endif
  51 #ifdef HAVE_SYS_UIO_H
  52 #include <sys/uio.h>
  53 #endif
  54 #ifdef HAVE_SYS_THR_H
  55 #include <sys/ucontext.h>
  56 #include <sys/thr.h>
  57 #endif
  58 #ifdef HAVE_UNISTD_H
  59 # include <unistd.h>
  60 #endif
  61
  62 #include "ntstatus.h"
  63 #define WIN32_NO_STATUS
  64 #include "wine/library.h"
  65 #include "wine/pthread.h"
  66 #include "wine/server.h"
  67 #include "wine/debug.h"
  68 #include "ntdll_misc.h"
  69
  70 WINE_DEFAULT_DEBUG_CHANNEL(server);
  71
  72 /* Some versions of glibc don't define this */
  73 #ifndef SCM_RIGHTS
  74 #define SCM_RIGHTS 1
  75 #endif
  76
  77 #define SOCKETNAME "socket"        /* name of the socket file */
  78 #define LOCKNAME   "lock"          /* name of the lock file */
  79
  80 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
  81 /* data structure used to pass an fd with sendmsg/recvmsg */
  82 struct cmsg_fd
  83 {
  84     struct
  85     {
  86         size_t len;   /* size of structure */
  87         int    level; /* SOL_SOCKET */
  88         int    type;  /* SCM_RIGHTS */
  89     } header;
  90     int fd;          /* fd to pass */
  91 };
  92 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
  93
  94 timeout_t server_start_time = 0;  /* time of server startup */
  95
  96 extern struct wine_pthread_functions pthread_functions;
  97
  98 sigset_t server_block_set;  /* signals to block during server calls */
  99 static int fd_socket = -1;  /* socket to exchange file descriptors with the server */
 100
 101 static RTL_CRITICAL_SECTION fd_cache_section;
 102 static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
 103 {
 104     0, 0, &fd_cache_section,
 105     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
 106       0, 0, { (DWORD_PTR)(__FILE__ ": fd_cache_section") }
 107 };
 108 static RTL_CRITICAL_SECTION fd_cache_section = { &critsect_debug, -1, 0, 0, 0, 0 };
 109
 110
 111 #ifdef __GNUC__
 112 static void fatal_error( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
 113 static void fatal_perror( const char *err, ... ) __attribute__((noreturn, format(printf,1,2)));
 114 static void server_connect_error( const char *serverdir ) __attribute__((noreturn));
 115 #endif
 116
 117 /* die on a fatal error; use only during initialization */
 118 static void fatal_error( const char *err, ... )
 119 {
 120     va_list args;
 121
 122     va_start( args, err );
 123     fprintf( stderr, "wine: " );
 124     vfprintf( stderr, err, args );
 125     va_end( args );
 126     exit(1);
 127 }
 128
 129 /* die on a fatal error; use only during initialization */
 130 static void fatal_perror( const char *err, ... )
 131 {
 132     va_list args;
 133
 134     va_start( args, err );
 135     fprintf( stderr, "wine: " );
 136     vfprintf( stderr, err, args );
 137     perror( " " );
 138     va_end( args );
 139     exit(1);
 140 }
 141
 142
 143 /***********************************************************************
 144  *           server_exit_thread
 145  */
 146 void server_exit_thread( int status )
 147 {
 148     struct wine_pthread_thread_info info;
 149     int fds[4];
 150
 151     RtlAcquirePebLock();
 152     RemoveEntryList( &NtCurrentTeb()->TlsLinks );
 153     RtlReleasePebLock();
 154     RtlFreeHeap( GetProcessHeap(), 0, NtCurrentTeb()->FlsSlots );
 155     RtlFreeHeap( GetProcessHeap(), 0, NtCurrentTeb()->TlsExpansionSlots );
 156
 157     info.stack_base  = NtCurrentTeb()->DeallocationStack;
 158     info.teb_base    = NtCurrentTeb();
 159     info.teb_sel     = wine_get_fs();
 160     info.exit_status = status;
 161
 162     fds[0] = ntdll_get_thread_data()->wait_fd[0];
 163     fds[1] = ntdll_get_thread_data()->wait_fd[1];
 164     fds[2] = ntdll_get_thread_data()->reply_fd;
 165     fds[3] = ntdll_get_thread_data()->request_fd;
 166     pthread_sigmask( SIG_BLOCK, &server_block_set, NULL );
 167
 168     info.stack_size = virtual_free_system_view( &info.stack_base );
 169     info.teb_size = virtual_free_system_view( &info.teb_base );
 170
 171     close( fds[0] );
 172     close( fds[1] );
 173     close( fds[2] );
 174     close( fds[3] );
 175     pthread_functions.exit_thread( &info );
 176 }
 177
 178
 179 /***********************************************************************
 180  *           server_abort_thread
 181  */
 182 void server_abort_thread( int status )
 183 {
 184     pthread_sigmask( SIG_BLOCK, &server_block_set, NULL );
 185     close( ntdll_get_thread_data()->wait_fd[0] );
 186     close( ntdll_get_thread_data()->wait_fd[1] );
 187     close( ntdll_get_thread_data()->reply_fd );
 188     close( ntdll_get_thread_data()->request_fd );
 189     pthread_functions.abort_thread( status );
 190 }
 191
 192
 193 /***********************************************************************
 194  *           server_protocol_error
 195  */
 196 void server_protocol_error( const char *err, ... )
 197 {
 198     va_list args;
 199
 200     va_start( args, err );
 201     fprintf( stderr, "wine client error:%x: ", GetCurrentThreadId() );
 202     vfprintf( stderr, err, args );
 203     va_end( args );
 204     server_abort_thread(1);
 205 }
 206
 207
 208 /***********************************************************************
 209  *           server_protocol_perror
 210  */
 211 void server_protocol_perror( const char *err )
 212 {
 213     fprintf( stderr, "wine client error:%x: ", GetCurrentThreadId() );
 214     perror( err );
 215     server_abort_thread(1);
 216 }
 217
 218
 219 /***********************************************************************
 220  *           send_request
 221  *
 222  * Send a request to the server.
 223  */
 224 static unsigned int send_request( const struct __server_request_info *req )
 225 {
 226     unsigned int i;
 227     int ret;
 228
 229     if (!req->u.req.request_header.request_size)
 230     {
 231         if ((ret = write( ntdll_get_thread_data()->request_fd, &req->u.req,
 232                           sizeof(req->u.req) )) == sizeof(req->u.req)) return STATUS_SUCCESS;
 233
 234     }
 235     else
 236     {
 237         struct iovec vec[__SERVER_MAX_DATA+1];
 238
 239         vec[0].iov_base = (void *)&req->u.req;
 240         vec[0].iov_len = sizeof(req->u.req);
 241         for (i = 0; i < req->data_count; i++)
 242         {
 243             vec[i+1].iov_base = (void *)req->data[i].ptr;
 244             vec[i+1].iov_len = req->data[i].size;
 245         }
 246         if ((ret = writev( ntdll_get_thread_data()->request_fd, vec, i+1 )) ==
 247             req->u.req.request_header.request_size + sizeof(req->u.req)) return STATUS_SUCCESS;
 248     }
 249
 250     if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
 251     if (errno == EPIPE) server_abort_thread(0);
 252     if (errno == EFAULT) return STATUS_ACCESS_VIOLATION;
 253     server_protocol_perror( "write" );
 254 }
 255
 256
 257 /***********************************************************************
 258  *           read_reply_data
 259  *
 260  * Read data from the reply buffer; helper for wait_reply.
 261  */
 262 static void read_reply_data( void *buffer, size_t size )
 263 {
 264     int ret;
 265
 266     for (;;)
 267     {
 268         if ((ret = read( ntdll_get_thread_data()->reply_fd, buffer, size )) > 0)
 269         {
 270             if (!(size -= ret)) return;
 271             buffer = (char *)buffer + ret;
 272             continue;
 273         }
 274         if (!ret) break;
 275         if (errno == EINTR) continue;
 276         if (errno == EPIPE) break;
 277         server_protocol_perror("read");
 278     }
 279     /* the server closed the connection; time to die... */
 280     server_abort_thread(0);
 281 }
 282
 283
 284 /***********************************************************************
 285  *           wait_reply
 286  *
 287  * Wait for a reply from the server.
 288  */
 289 static inline unsigned int wait_reply( struct __server_request_info *req )
 290 {
 291     read_reply_data( &req->u.reply, sizeof(req->u.reply) );
 292     if (req->u.reply.reply_header.reply_size)
 293         read_reply_data( req->reply_data, req->u.reply.reply_header.reply_size );
 294     return req->u.reply.reply_header.error;
 295 }
 296
 297
 298 /***********************************************************************
 299  *           wine_server_call (NTDLL.@)
 300  *
 301  * Perform a server call.
 302  *
 303  * PARAMS
 304  *     req_ptr [I/O] Function dependent data
 305  *
 306  * RETURNS
 307  *     Depends on server function being called, but usually an NTSTATUS code.
 308  *
 309  * NOTES
 310  *     Use the SERVER_START_REQ and SERVER_END_REQ to help you fill out the
 311  *     server request structure for the particular call. E.g:
 312  *|     SERVER_START_REQ( event_op )
 313  *|     {
 314  *|         req->handle = handle;
 315  *|         req->op     = SET_EVENT;
 316  *|         ret = wine_server_call( req );
 317  *|     }
 318  *|     SERVER_END_REQ;
 319  */
 320 unsigned int wine_server_call( void *req_ptr )
 321 {
 322     struct __server_request_info * const req = req_ptr;
 323     sigset_t old_set;
 324     unsigned int ret;
 325
 326     pthread_sigmask( SIG_BLOCK, &server_block_set, &old_set );
 327     ret = send_request( req );
 328     if (!ret) ret = wait_reply( req );
 329     pthread_sigmask( SIG_SETMASK, &old_set, NULL );
 330     return ret;
 331 }
 332
 333
 334 /***********************************************************************
 335  *           server_enter_uninterrupted_section
 336  */
 337 void server_enter_uninterrupted_section( RTL_CRITICAL_SECTION *cs, sigset_t *sigset )
 338 {
 339     pthread_sigmask( SIG_BLOCK, &server_block_set, sigset );
 340     RtlEnterCriticalSection( cs );
 341 }
 342
 343
 344 /***********************************************************************
 345  *           server_leave_uninterrupted_section
 346  */
 347 void server_leave_uninterrupted_section( RTL_CRITICAL_SECTION *cs, sigset_t *sigset )
 348 {
 349     RtlLeaveCriticalSection( cs );
 350     pthread_sigmask( SIG_SETMASK, sigset, NULL );
 351 }
 352
 353
 354 /***********************************************************************
 355  *           wine_server_send_fd   (NTDLL.@)
 356  *
 357  * Send a file descriptor to the server.
 358  *
 359  * PARAMS
 360  *     fd [I] file descriptor to send
 361  *
 362  * RETURNS
 363  *     nothing
 364  */
 365 void CDECL wine_server_send_fd( int fd )
 366 {
 367 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 368     struct cmsg_fd cmsg;
 369 #endif
 370     struct send_fd data;
 371     struct msghdr msghdr;
 372     struct iovec vec;
 373     int ret;
 374
 375     vec.iov_base = (void *)&data;
 376     vec.iov_len  = sizeof(data);
 377
 378     msghdr.msg_name    = NULL;
 379     msghdr.msg_namelen = 0;
 380     msghdr.msg_iov     = &vec;
 381     msghdr.msg_iovlen  = 1;
 382
 383 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 384     msghdr.msg_accrights    = (void *)&fd;
 385     msghdr.msg_accrightslen = sizeof(fd);
 386 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 387     cmsg.header.len   = sizeof(cmsg.header) + sizeof(fd);
 388     cmsg.header.level = SOL_SOCKET;
 389     cmsg.header.type  = SCM_RIGHTS;
 390     cmsg.fd           = fd;
 391     msghdr.msg_control    = &cmsg;
 392     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 393     msghdr.msg_flags      = 0;
 394 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 395
 396     data.tid = GetCurrentThreadId();
 397     data.fd  = fd;
 398
 399     for (;;)
 400     {
 401         if ((ret = sendmsg( fd_socket, &msghdr, 0 )) == sizeof(data)) return;
 402         if (ret >= 0) server_protocol_error( "partial write %d\n", ret );
 403         if (errno == EINTR) continue;
 404         if (errno == EPIPE) server_abort_thread(0);
 405         server_protocol_perror( "sendmsg" );
 406     }
 407 }
 408
 409
 410 /***********************************************************************
 411  *           receive_fd
 412  *
 413  * Receive a file descriptor passed from the server.
 414  */
 415 static int receive_fd( obj_handle_t *handle )
 416 {
 417     struct iovec vec;
 418     int ret, fd;
 419
 420 #ifdef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 421     struct msghdr msghdr;
 422
 423     fd = -1;
 424     msghdr.msg_accrights    = (void *)&fd;
 425     msghdr.msg_accrightslen = sizeof(fd);
 426 #else  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 427     struct msghdr msghdr;
 428     struct cmsg_fd cmsg;
 429
 430     cmsg.header.len   = sizeof(cmsg.header) + sizeof(fd);
 431     cmsg.header.level = SOL_SOCKET;
 432     cmsg.header.type  = SCM_RIGHTS;
 433     cmsg.fd           = -1;
 434     msghdr.msg_control    = &cmsg;
 435     msghdr.msg_controllen = sizeof(cmsg.header) + sizeof(fd);
 436     msghdr.msg_flags      = 0;
 437 #endif  /* HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS */
 438
 439     msghdr.msg_name    = NULL;
 440     msghdr.msg_namelen = 0;
 441     msghdr.msg_iov     = &vec;
 442     msghdr.msg_iovlen  = 1;
 443     vec.iov_base = (void *)handle;
 444     vec.iov_len  = sizeof(*handle);
 445
 446     for (;;)
 447     {
 448         if ((ret = recvmsg( fd_socket, &msghdr, 0 )) > 0)
 449         {
 450 #ifndef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 451             fd = cmsg.fd;
 452 #endif
 453             if (fd != -1) fcntl( fd, F_SETFD, 1 ); /* set close on exec flag */
 454             return fd;
 455         }
 456         if (!ret) break;
 457         if (errno == EINTR) continue;
 458         if (errno == EPIPE) break;
 459         server_protocol_perror("recvmsg");
 460     }
 461     /* the server closed the connection; time to die... */
 462     server_abort_thread(0);
 463 }
 464
 465
 466 /***********************************************************************/
 467 /* fd cache support */
 468
 469 struct fd_cache_entry
 470 {
 471     int fd;
 472     enum server_fd_type type : 6;
 473     unsigned int        access : 2;
 474     unsigned int        options : 24;
 475 };
 476
 477 #define FD_CACHE_BLOCK_SIZE  (65536 / sizeof(struct fd_cache_entry))
 478 #define FD_CACHE_ENTRIES     128
 479
 480 static struct fd_cache_entry *fd_cache[FD_CACHE_ENTRIES];
 481 static struct fd_cache_entry fd_cache_initial_block[FD_CACHE_BLOCK_SIZE];
 482
 483 static inline unsigned int handle_to_index( HANDLE handle, unsigned int *entry )
 484 {
 485     unsigned int idx = (wine_server_obj_handle(handle) >> 2) - 1;
 486     *entry = idx / FD_CACHE_BLOCK_SIZE;
 487     return idx % FD_CACHE_BLOCK_SIZE;
 488 }
 489
 490
 491 /***********************************************************************
 492  *           add_fd_to_cache
 493  *
 494  * Caller must hold fd_cache_section.
 495  */
 496 static int add_fd_to_cache( HANDLE handle, int fd, enum server_fd_type type,
 497                             unsigned int access, unsigned int options )
 498 {
 499     unsigned int entry, idx = handle_to_index( handle, &entry );
 500     int prev_fd;
 501
 502     if (entry >= FD_CACHE_ENTRIES)
 503     {
 504         FIXME( "too many allocated handles, not caching %p\n", handle );
 505         return 0;
 506     }
 507
 508     if (!fd_cache[entry])  /* do we need to allocate a new block of entries? */
 509     {
 510         if (!entry) fd_cache[0] = fd_cache_initial_block;
 511         else
 512         {
 513             void *ptr = wine_anon_mmap( NULL, FD_CACHE_BLOCK_SIZE * sizeof(struct fd_cache_entry),
 514                                         PROT_READ | PROT_WRITE, 0 );
 515             if (ptr == MAP_FAILED) return 0;
 516             fd_cache[entry] = ptr;
 517         }
 518     }
 519     /* store fd+1 so that 0 can be used as the unset value */
 520     prev_fd = interlocked_xchg( &fd_cache[entry][idx].fd, fd + 1 ) - 1;
 521     fd_cache[entry][idx].type = type;
 522     fd_cache[entry][idx].access = access;
 523     fd_cache[entry][idx].options = options;
 524     if (prev_fd != -1) close( prev_fd );
 525     return 1;
 526 }
 527
 528
 529 /***********************************************************************
 530  *           get_cached_fd
 531  *
 532  * Caller must hold fd_cache_section.
 533  */
 534 static inline int get_cached_fd( HANDLE handle, enum server_fd_type *type,
 535                                  unsigned int *access, unsigned int *options )
 536 {
 537     unsigned int entry, idx = handle_to_index( handle, &entry );
 538     int fd = -1;
 539
 540     if (entry < FD_CACHE_ENTRIES && fd_cache[entry])
 541     {
 542         fd = fd_cache[entry][idx].fd - 1;
 543         if (type) *type = fd_cache[entry][idx].type;
 544         if (access) *access = fd_cache[entry][idx].access;
 545         if (options) *options = fd_cache[entry][idx].options;
 546     }
 547     return fd;
 548 }
 549
 550
 551 /***********************************************************************
 552  *           server_remove_fd_from_cache
 553  */
 554 int server_remove_fd_from_cache( HANDLE handle )
 555 {
 556     unsigned int entry, idx = handle_to_index( handle, &entry );
 557     int fd = -1;
 558
 559     if (entry < FD_CACHE_ENTRIES && fd_cache[entry])
 560         fd = interlocked_xchg( &fd_cache[entry][idx].fd, 0 ) - 1;
 561
 562     return fd;
 563 }
 564
 565
 566 /***********************************************************************
 567  *           server_get_unix_fd
 568  *
 569  * The returned unix_fd should be closed iff needs_close is non-zero.
 570  */
 571 int server_get_unix_fd( HANDLE handle, unsigned int wanted_access, int *unix_fd,
 572                         int *needs_close, enum server_fd_type *type, unsigned int *options )
 573 {
 574     sigset_t sigset;
 575     obj_handle_t fd_handle;
 576     int ret = 0, fd;
 577     unsigned int access = 0;
 578
 579     *unix_fd = -1;
 580     *needs_close = 0;
 581     wanted_access &= FILE_READ_DATA | FILE_WRITE_DATA;
 582
 583     server_enter_uninterrupted_section( &fd_cache_section, &sigset );
 584
 585     fd = get_cached_fd( handle, type, &access, options );
 586     if (fd != -1) goto done;
 587
 588     SERVER_START_REQ( get_handle_fd )
 589     {
 590         req->handle = wine_server_obj_handle( handle );
 591         if (!(ret = wine_server_call( req )))
 592         {
 593             if (type) *type = reply->type;
 594             if (options) *options = reply->options;
 595             access = reply->access;
 596             if ((fd = receive_fd( &fd_handle )) != -1)
 597             {
 598                 assert( wine_server_ptr_handle(fd_handle) == handle );
 599                 *needs_close = (reply->removable ||
 600                                 !add_fd_to_cache( handle, fd, reply->type,
 601                                                   reply->access, reply->options ));
 602             }
 603             else ret = STATUS_TOO_MANY_OPENED_FILES;
 604         }
 605     }
 606     SERVER_END_REQ;
 607
 608 done:
 609     server_leave_uninterrupted_section( &fd_cache_section, &sigset );
 610     if (!ret && ((access & wanted_access) != wanted_access))
 611     {
 612         ret = STATUS_ACCESS_DENIED;
 613         if (*needs_close) close( fd );
 614     }
 615     if (!ret) *unix_fd = fd;
 616     return ret;
 617 }
 618
 619
 620 /***********************************************************************
 621  *           wine_server_fd_to_handle   (NTDLL.@)
 622  *
 623  * Allocate a file handle for a Unix file descriptor.
 624  *
 625  * PARAMS
 626  *     fd      [I] Unix file descriptor.
 627  *     access  [I] Win32 access flags.
 628  *     attributes [I] Object attributes.
 629  *     handle  [O] Address where Wine file handle will be stored.
 630  *
 631  * RETURNS
 632  *     NTSTATUS code
 633  */
 634 int CDECL wine_server_fd_to_handle( int fd, unsigned int access, unsigned int attributes, HANDLE *handle )
 635 {
 636     int ret;
 637
 638     *handle = 0;
 639     wine_server_send_fd( fd );
 640
 641     SERVER_START_REQ( alloc_file_handle )
 642     {
 643         req->access     = access;
 644         req->attributes = attributes;
 645         req->fd         = fd;
 646         if (!(ret = wine_server_call( req ))) *handle = wine_server_ptr_handle( reply->handle );
 647     }
 648     SERVER_END_REQ;
 649     return ret;
 650 }
 651
 652
 653 /***********************************************************************
 654  *           wine_server_handle_to_fd   (NTDLL.@)
 655  *
 656  * Retrieve the file descriptor corresponding to a file handle.
 657  *
 658  * PARAMS
 659  *     handle  [I] Wine file handle.
 660  *     access  [I] Win32 file access rights requested.
 661  *     unix_fd [O] Address where Unix file descriptor will be stored.
 662  *     options [O] Address where the file open options will be stored. Optional.
 663  *
 664  * RETURNS
 665  *     NTSTATUS code
 666  */
 667 int CDECL wine_server_handle_to_fd( HANDLE handle, unsigned int access, int *unix_fd,
 668                               unsigned int *options )
 669 {
 670     int needs_close, ret = server_get_unix_fd( handle, access, unix_fd, &needs_close, NULL, options );
 671
 672     if (!ret && !needs_close)
 673     {
 674         if ((*unix_fd = dup(*unix_fd)) == -1) ret = FILE_GetNtStatus();
 675     }
 676     return ret;
 677 }
 678
 679
 680 /***********************************************************************
 681  *           wine_server_release_fd   (NTDLL.@)
 682  *
 683  * Release the Unix file descriptor returned by wine_server_handle_to_fd.
 684  *
 685  * PARAMS
 686  *     handle  [I] Wine file handle.
 687  *     unix_fd [I] Unix file descriptor to release.
 688  *
 689  * RETURNS
 690  *     nothing
 691  */
 692 void CDECL wine_server_release_fd( HANDLE handle, int unix_fd )
 693 {
 694     close( unix_fd );
 695 }
 696
 697
 698 /***********************************************************************
 699  *           start_server
 700  *
 701  * Start a new wine server.
 702  */
 703 static void start_server(void)
 704 {
 705     static int started;  /* we only try once */
 706     char *argv[3];
 707     static char wineserver[] = "server/wineserver";
 708     static char debug[] = "-d";
 709
 710     if (!started)
 711     {
 712         int status;
 713         int pid = fork();
 714         if (pid == -1) fatal_perror( "fork" );
 715         if (!pid)
 716         {
 717             argv[0] = wineserver;
 718             argv[1] = TRACE_ON(server) ? debug : NULL;
 719             argv[2] = NULL;
 720             wine_exec_wine_binary( argv[0], argv, getenv("WINESERVER") );
 721             fatal_error( "could not exec wineserver\n" );
 722         }
 723         waitpid( pid, &status, 0 );
 724         status = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
 725         if (status == 2) return;  /* server lock held by someone else, will retry later */
 726         if (status) exit(status);  /* server failed */
 727         started = 1;
 728     }
 729 }
 730
 731
 732 /***********************************************************************
 733  *           setup_config_dir
 734  *
 735  * Setup the wine configuration dir.
 736  */
 737 static void setup_config_dir(void)
 738 {
 739     const char *p, *config_dir = wine_get_config_dir();
 740
 741     if (chdir( config_dir ) == -1)
 742     {
 743         if (errno != ENOENT) fatal_perror( "chdir to %s\n", config_dir );
 744
 745         if ((p = strrchr( config_dir, '/' )) && p != config_dir)
 746         {
 747             struct stat st;
 748             char *tmp_dir;
 749
 750             if (!(tmp_dir = malloc( p + 1 - config_dir ))) fatal_error( "out of memory\n" );
 751             memcpy( tmp_dir, config_dir, p - config_dir );
 752             tmp_dir[p - config_dir] = 0;
 753             if (!stat( tmp_dir, &st ) && st.st_uid != getuid())
 754                 fatal_error( "'%s' is not owned by you, refusing to create a configuration directory there\n",
 755                              tmp_dir );
 756             free( tmp_dir );
 757         }
 758
 759         mkdir( config_dir, 0777 );
 760         if (chdir( config_dir ) == -1) fatal_perror( "chdir to %s\n", config_dir );
 761         MESSAGE( "wine: created the configuration directory '%s'\n", config_dir );
 762     }
 763
 764     if (mkdir( "dosdevices", 0777 ) == -1)
 765     {
 766         if (errno == EEXIST) return;
 767         fatal_perror( "cannot create %s/dosdevices\n", config_dir );
 768     }
 769
 770     /* create the drive symlinks */
 771
 772     mkdir( "drive_c", 0777 );
 773     symlink( "../drive_c", "dosdevices/c:" );
 774     symlink( "/", "dosdevices/z:" );
 775 }
 776
 777
 778 /***********************************************************************
 779  *           server_connect_error
 780  *
 781  * Try to display a meaningful explanation of why we couldn't connect
 782  * to the server.
 783  */
 784 static void server_connect_error( const char *serverdir )
 785 {
 786     int fd;
 787     struct flock fl;
 788
 789     if ((fd = open( LOCKNAME, O_WRONLY )) == -1)
 790         fatal_error( "for some mysterious reason, the wine server never started.\n" );
 791
 792     fl.l_type   = F_WRLCK;
 793     fl.l_whence = SEEK_SET;
 794     fl.l_start  = 0;
 795     fl.l_len    = 1;
 796     if (fcntl( fd, F_GETLK, &fl ) != -1)
 797     {
 798         if (fl.l_type == F_WRLCK)  /* the file is locked */
 799             fatal_error( "a wine server seems to be running, but I cannot connect to it.\n"
 800                          "   You probably need to kill that process (it might be pid %d).\n",
 801                          (int)fl.l_pid );
 802         fatal_error( "for some mysterious reason, the wine server failed to run.\n" );
 803     }
 804     fatal_error( "the file system of '%s' doesn't support locks,\n"
 805           "   and there is a 'socket' file in that directory that prevents wine from starting.\n"
 806           "   You should make sure no wine server is running, remove that file and try again.\n",
 807                  serverdir );
 808 }
 809
 810
 811 /***********************************************************************
 812  *           server_connect
 813  *
 814  * Attempt to connect to an existing server socket.
 815  * We need to be in the server directory already.
 816  */
 817 static int server_connect(void)
 818 {
 819     const char *serverdir;
 820     struct sockaddr_un addr;
 821     struct stat st;
 822     int s, slen, retry, fd_cwd;
 823
 824     /* retrieve the current directory */
 825     fd_cwd = open( ".", O_RDONLY );
 826     if (fd_cwd != -1) fcntl( fd_cwd, F_SETFD, 1 ); /* set close on exec flag */
 827
 828     setup_config_dir();
 829     serverdir = wine_get_server_dir();
 830
 831     /* chdir to the server directory */
 832     if (chdir( serverdir ) == -1)
 833     {
 834         if (errno != ENOENT) fatal_perror( "chdir to %s", serverdir );
 835         start_server();
 836         if (chdir( serverdir ) == -1) fatal_perror( "chdir to %s", serverdir );
 837     }
 838
 839     /* make sure we are at the right place */
 840     if (stat( ".", &st ) == -1) fatal_perror( "stat %s", serverdir );
 841     if (st.st_uid != getuid()) fatal_error( "'%s' is not owned by you\n", serverdir );
 842     if (st.st_mode & 077) fatal_error( "'%s' must not be accessible by other users\n", serverdir );
 843
 844     for (retry = 0; retry < 6; retry++)
 845     {
 846         /* if not the first try, wait a bit to leave the previous server time to exit */
 847         if (retry)
 848         {
 849             usleep( 100000 * retry * retry );
 850             start_server();
 851             if (lstat( SOCKETNAME, &st ) == -1) continue;  /* still no socket, wait a bit more */
 852         }
 853         else if (lstat( SOCKETNAME, &st ) == -1) /* check for an already existing socket */
 854         {
 855             if (errno != ENOENT) fatal_perror( "lstat %s/%s", serverdir, SOCKETNAME );
 856             start_server();
 857             if (lstat( SOCKETNAME, &st ) == -1) continue;  /* still no socket, wait a bit more */
 858         }
 859
 860         /* make sure the socket is sane (ISFIFO needed for Solaris) */
 861         if (!S_ISSOCK(st.st_mode) && !S_ISFIFO(st.st_mode))
 862             fatal_error( "'%s/%s' is not a socket\n", serverdir, SOCKETNAME );
 863         if (st.st_uid != getuid())
 864             fatal_error( "'%s/%s' is not owned by you\n", serverdir, SOCKETNAME );
 865
 866         /* try to connect to it */
 867         addr.sun_family = AF_UNIX;
 868         strcpy( addr.sun_path, SOCKETNAME );
 869         slen = sizeof(addr) - sizeof(addr.sun_path) + strlen(addr.sun_path) + 1;
 870 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 871         addr.sun_len = slen;
 872 #endif
 873         if ((s = socket( AF_UNIX, SOCK_STREAM, 0 )) == -1) fatal_perror( "socket" );
 874         if (connect( s, (struct sockaddr *)&addr, slen ) != -1)
 875         {
 876             /* switch back to the starting directory */
 877             if (fd_cwd != -1)
 878             {
 879                 fchdir( fd_cwd );
 880                 close( fd_cwd );
 881             }
 882             fcntl( s, F_SETFD, 1 ); /* set close on exec flag */
 883             return s;
 884         }
 885         close( s );
 886     }
 887     server_connect_error( serverdir );
 888 }
 889
 890
 891 #ifdef __APPLE__
 892 #include <mach/mach.h>
 893 #include <mach/mach_error.h>
 894 #include <servers/bootstrap.h>
 895
 896 /* send our task port to the server */
 897 static void send_server_task_port(void)
 898 {
 899     mach_port_t bootstrap_port, wineserver_port;
 900     kern_return_t kret;
 901
 902     struct {
 903         mach_msg_header_t           header;
 904         mach_msg_body_t             body;
 905         mach_msg_port_descriptor_t  task_port;
 906     } msg;
 907
 908     if (task_get_bootstrap_port(mach_task_self(), &bootstrap_port) != KERN_SUCCESS) return;
 909
 910     kret = bootstrap_look_up(bootstrap_port, (char*)wine_get_server_dir(), &wineserver_port);
 911     if (kret != KERN_SUCCESS)
 912         fatal_error( "cannot find the server port: 0x%08x\n", kret );
 913
 914     mach_port_deallocate(mach_task_self(), bootstrap_port);
 915
 916     msg.header.msgh_bits        = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0) | MACH_MSGH_BITS_COMPLEX;
 917     msg.header.msgh_size        = sizeof(msg);
 918     msg.header.msgh_remote_port = wineserver_port;
 919     msg.header.msgh_local_port  = MACH_PORT_NULL;
 920
 921     msg.body.msgh_descriptor_count  = 1;
 922     msg.task_port.name              = mach_task_self();
 923     msg.task_port.disposition       = MACH_MSG_TYPE_COPY_SEND;
 924     msg.task_port.type              = MACH_MSG_PORT_DESCRIPTOR;
 925
 926     kret = mach_msg_send(&msg.header);
 927     if (kret != KERN_SUCCESS)
 928         server_protocol_error( "mach_msg_send failed: 0x%08x\n", kret );
 929
 930     mach_port_deallocate(mach_task_self(), wineserver_port);
 931 }
 932 #endif  /* __APPLE__ */
 933
 934
 935 /***********************************************************************
 936  *           get_unix_tid
 937  *
 938  * Retrieve the Unix tid to use on the server side for the current thread.
 939  */
 940 static int get_unix_tid(void)
 941 {
 942     int ret = -1;
 943 #if defined(linux) && defined(__i386__)
 944     __asm__("int $0x80" : "=a" (ret) : "0" (224) /* SYS_gettid */);
 945 #elif defined(linux) && defined(__x86_64__)
 946     __asm__("syscall" : "=a" (ret) : "0" (186) /* SYS_gettid */);
 947 #elif defined(__sun)
 948     ret = pthread_self();
 949 #elif defined(__APPLE__)
 950     ret = mach_thread_self();
 951 #elif defined(__FreeBSD__)
 952     long lwpid;
 953     thr_self( &lwpid );
 954     ret = lwpid;
 955 #endif
 956     return ret;
 957 }
 958
 959
 960 /***********************************************************************
 961  *           server_init_process
 962  *
 963  * Start the server and create the initial socket pair.
 964  */
 965 void server_init_process(void)
 966 {
 967     obj_handle_t version;
 968     const char *env_socket = getenv( "WINESERVERSOCKET" );
 969
 970     if (env_socket)
 971     {
 972         fd_socket = atoi( env_socket );
 973         if (fcntl( fd_socket, F_SETFD, 1 ) == -1)
 974             fatal_perror( "Bad server socket %d", fd_socket );
 975         unsetenv( "WINESERVERSOCKET" );
 976     }
 977     else fd_socket = server_connect();
 978
 979     /* setup the signal mask */
 980     sigemptyset( &server_block_set );
 981     sigaddset( &server_block_set, SIGALRM );
 982     sigaddset( &server_block_set, SIGIO );
 983     sigaddset( &server_block_set, SIGINT );
 984     sigaddset( &server_block_set, SIGHUP );
 985     sigaddset( &server_block_set, SIGUSR1 );
 986     sigaddset( &server_block_set, SIGUSR2 );
 987     sigaddset( &server_block_set, SIGCHLD );
 988     pthread_sigmask( SIG_BLOCK, &server_block_set, NULL );
 989
 990     /* receive the first thread request fd on the main socket */
 991     ntdll_get_thread_data()->request_fd = receive_fd( &version );
 992
 993     if (version != SERVER_PROTOCOL_VERSION)
 994         server_protocol_error( "version mismatch %d/%d.\n"
 995                                "Your %s binary was not upgraded correctly,\n"
 996                                "or you have an older one somewhere in your PATH.\n"
 997                                "Or maybe the wrong wineserver is still running?\n",
 998                                version, SERVER_PROTOCOL_VERSION,
 999                                (version > SERVER_PROTOCOL_VERSION) ? "wine" : "wineserver" );
1000 #ifdef __APPLE__
1001     send_server_task_port();
1002 #endif
1003 }
1004
1005
1006 /***********************************************************************
1007  *           server_init_process_done
1008  */
1009 NTSTATUS server_init_process_done(void)
1010 {
1011     PEB *peb = NtCurrentTeb()->Peb;
1012     IMAGE_NT_HEADERS *nt = RtlImageNtHeader( peb->ImageBaseAddress );
1013     NTSTATUS status;
1014
1015     /* Install signal handlers; this cannot be done earlier, since we cannot
1016      * send exceptions to the debugger before the create process event that
1017      * is sent by REQ_INIT_PROCESS_DONE.
1018      * We do need the handlers in place by the time the request is over, so
1019      * we set them up here. If we segfault between here and the server call
1020      * something is very wrong... */
1021     signal_init_process();
1022
1023     /* Signal the parent process to continue */
1024     SERVER_START_REQ( init_process_done )
1025     {
1026         req->module   = wine_server_client_ptr( peb->ImageBaseAddress );
1027 #ifdef __i386__
1028         req->ldt_copy = wine_server_client_ptr( &wine_ldt_copy );
1029 #endif
1030         req->entry    = wine_server_client_ptr( (char *)peb->ImageBaseAddress + nt->OptionalHeader.AddressOfEntryPoint );
1031         req->gui      = (nt->OptionalHeader.Subsystem != IMAGE_SUBSYSTEM_WINDOWS_CUI);
1032         status = wine_server_call( req );
1033     }
1034     SERVER_END_REQ;
1035
1036     return status;
1037 }
1038
1039
1040 /***********************************************************************
1041  *           server_init_thread
1042  *
1043  * Send an init thread request. Return 0 if OK.
1044  */
1045 size_t server_init_thread( void *entry_point )
1046 {
1047     int ret;
1048     int reply_pipe[2];
1049     struct sigaction sig_act;
1050     size_t info_size;
1051
1052     sig_act.sa_handler = SIG_IGN;
1053     sig_act.sa_flags   = 0;
1054     sigemptyset( &sig_act.sa_mask );
1055
1056     /* ignore SIGPIPE so that we get an EPIPE error instead  */
1057     sigaction( SIGPIPE, &sig_act, NULL );
1058     /* automatic child reaping to avoid zombies */
1059 #ifdef SA_NOCLDWAIT
1060     sig_act.sa_flags |= SA_NOCLDWAIT;
1061 #endif
1062     sigaction( SIGCHLD, &sig_act, NULL );
1063
1064     /* create the server->client communication pipes */
1065     if (pipe( reply_pipe ) == -1) server_protocol_perror( "pipe" );
1066     if (pipe( ntdll_get_thread_data()->wait_fd ) == -1) server_protocol_perror( "pipe" );
1067     wine_server_send_fd( reply_pipe[1] );
1068     wine_server_send_fd( ntdll_get_thread_data()->wait_fd[1] );
1069     ntdll_get_thread_data()->reply_fd = reply_pipe[0];
1070     close( reply_pipe[1] );
1071
1072     /* set close on exec flag */
1073     fcntl( ntdll_get_thread_data()->reply_fd, F_SETFD, 1 );
1074     fcntl( ntdll_get_thread_data()->wait_fd[0], F_SETFD, 1 );
1075     fcntl( ntdll_get_thread_data()->wait_fd[1], F_SETFD, 1 );
1076
1077     SERVER_START_REQ( init_thread )
1078     {
1079         req->unix_pid    = getpid();
1080         req->unix_tid    = get_unix_tid();
1081         req->teb         = wine_server_client_ptr( NtCurrentTeb() );
1082         req->peb         = wine_server_client_ptr( NtCurrentTeb()->Peb );
1083         req->entry       = wine_server_client_ptr( entry_point );
1084         req->reply_fd    = reply_pipe[1];
1085         req->wait_fd     = ntdll_get_thread_data()->wait_fd[1];
1086         req->debug_level = (TRACE_ON(server) != 0);
1087         ret = wine_server_call( req );
1088         NtCurrentTeb()->ClientId.UniqueProcess = ULongToHandle(reply->pid);
1089         NtCurrentTeb()->ClientId.UniqueThread  = ULongToHandle(reply->tid);
1090         info_size         = reply->info_size;
1091         server_start_time = reply->server_start;
1092     }
1093     SERVER_END_REQ;
1094
1095     if (ret) server_protocol_error( "init_thread failed with status %x\n", ret );
1096     return info_size;
1097 }