server/mapping.c

   1 /*
   2  * Server-side file mapping management
   3  *
   4  * Copyright (C) 1999 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28
  29 #include "winnt.h"
  30 #include "winbase.h"
  31
  32 #include "handle.h"
  33 #include "thread.h"
  34 #include "request.h"
  35
  36 struct mapping
  37 {
  38     struct object   obj;             /* object header */
  39     int             size_high;       /* mapping size */
  40     int             size_low;        /* mapping size */
  41     int             protect;         /* protection flags */
  42     struct file    *file;            /* file mapped */
  43     int             header_size;     /* size of headers (for PE image mapping) */
  44     void           *base;            /* default base addr (for PE image mapping) */
  45     struct file    *shared_file;     /* temp file for shared PE mapping */
  46     int             shared_size;     /* shared mapping total size */
  47     struct mapping *shared_next;     /* next in shared PE mapping list */
  48     struct mapping *shared_prev;     /* prev in shared PE mapping list */
  49 };
  50
  51 static int mapping_get_fd( struct object *obj );
  52 static int mapping_get_info( struct object *obj, struct get_file_info_reply *reply, int *flags );
  53 static void mapping_dump( struct object *obj, int verbose );
  54 static void mapping_destroy( struct object *obj );
  55
  56 static const struct object_ops mapping_ops =
  57 {
  58     sizeof(struct mapping),      /* size */
  59     mapping_dump,                /* dump */
  60     no_add_queue,                /* add_queue */
  61     NULL,                        /* remove_queue */
  62     NULL,                        /* signaled */
  63     NULL,                        /* satisfied */
  64     NULL,                        /* get_poll_events */
  65     NULL,                        /* poll_event */
  66     mapping_get_fd,              /* get_fd */
  67     no_flush,                    /* flush */
  68     mapping_get_info,            /* get_file_info */
  69     NULL,                        /* queue_async */
  70     mapping_destroy              /* destroy */
  71 };
  72
  73 static struct mapping *shared_first;
  74
  75 #ifdef __i386__
  76
  77 /* These are always the same on an i386, and it will be faster this way */
  78 # define page_mask  0xfff
  79 # define page_shift 12
  80 # define init_page_size() do { /* nothing */ } while(0)
  81
  82 #else  /* __i386__ */
  83
  84 static int page_shift, page_mask;
  85
  86 static void init_page_size(void)
  87 {
  88     int page_size;
  89 # ifdef HAVE_GETPAGESIZE
  90     page_size = getpagesize();
  91 # else
  92 #  ifdef __svr4__
  93     page_size = sysconf(_SC_PAGESIZE);
  94 #  else
  95 #   error Cannot get the page size on this platform
  96 #  endif
  97 # endif
  98     page_mask = page_size - 1;
  99     /* Make sure we have a power of 2 */
 100     assert( !(page_size & page_mask) );
 101     page_shift = 0;
 102     while ((1 << page_shift) != page_size) page_shift++;
 103 }
 104 #endif  /* __i386__ */
 105
 106 #define ROUND_ADDR(addr) \
 107    ((int)(addr) & ~page_mask)
 108
 109 #define ROUND_SIZE(addr,size) \
 110    (((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask)
 111
 112 /* get the fd to use for mmaping a file */
 113 inline static int get_mmap_fd( struct file *file )
 114 {
 115     struct object *obj;
 116     if (!(obj = (struct object *)file))
 117     {
 118         set_error( STATUS_INVALID_HANDLE );
 119         return -1;
 120     }
 121     return obj->ops->get_fd( obj );
 122 }
 123
 124 /* find the shared PE mapping for a given mapping */
 125 static struct file *get_shared_file( struct mapping *mapping )
 126 {
 127     struct mapping *ptr;
 128
 129     for (ptr = shared_first; ptr; ptr = ptr->shared_next)
 130         if (is_same_file( ptr->file, mapping->file ))
 131             return (struct file *)grab_object( ptr->shared_file );
 132     return NULL;
 133 }
 134
 135 /* allocate and fill the temp file for a shared PE image mapping */
 136 static int build_shared_mapping( struct mapping *mapping, int fd,
 137                                  IMAGE_SECTION_HEADER *sec, int nb_sec )
 138 {
 139     int i, max_size, total_size, pos;
 140     char *buffer = NULL;
 141     int shared_fd;
 142     long toread;
 143
 144     /* compute the total size of the shared mapping */
 145
 146     total_size = max_size = 0;
 147     for (i = 0; i < nb_sec; i++)
 148     {
 149         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 150             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 151         {
 152             int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
 153             if (size > max_size) max_size = size;
 154             total_size += size;
 155         }
 156     }
 157     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 158
 159     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 160
 161     /* create a temp file for the mapping */
 162
 163     if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
 164     if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
 165     if ((shared_fd = get_mmap_fd( mapping->shared_file )) == -1) goto error;
 166
 167     if (!(buffer = malloc( max_size ))) goto error;
 168
 169     /* copy the shared sections data into the temp file */
 170
 171     for (i = pos = 0; i < nb_sec; i++)
 172     {
 173         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
 174         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
 175         if (lseek( shared_fd, pos, SEEK_SET ) != pos) goto error;
 176         pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
 177         if (sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) continue;
 178         if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
 179         if (lseek( fd, sec[i].PointerToRawData, SEEK_SET ) != sec[i].PointerToRawData) goto error;
 180         toread = sec[i].SizeOfRawData;
 181         while (toread)
 182         {
 183             long res = read( fd, buffer + sec[i].SizeOfRawData - toread, toread );
 184             if (res <= 0) goto error;
 185             toread -= res;
 186         }
 187         if (write( shared_fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) goto error;
 188     }
 189     free( buffer );
 190     return 1;
 191
 192  error:
 193     release_object( mapping->shared_file );
 194     mapping->shared_file = NULL;
 195     if (buffer) free( buffer );
 196     return 0;
 197 }
 198
 199 /* retrieve the mapping parameters for an executable (PE) image */
 200 static int get_image_params( struct mapping *mapping )
 201 {
 202     IMAGE_DOS_HEADER dos;
 203     IMAGE_NT_HEADERS nt;
 204     IMAGE_SECTION_HEADER *sec = NULL;
 205     int fd, filepos, size;
 206
 207     /* load the headers */
 208
 209     if ((fd = get_mmap_fd( mapping->file )) == -1) return 0;
 210     filepos = lseek( fd, 0, SEEK_SET );
 211     if (read( fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
 212     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 213     if (lseek( fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
 214     if (read( fd, &nt, sizeof(nt) ) != sizeof(nt)) goto error;
 215     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 216
 217     /* load the section headers */
 218
 219     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 220     if (!(sec = malloc( size ))) goto error;
 221     if (read( fd, sec, size ) != size) goto error;
 222
 223     if (!build_shared_mapping( mapping, fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 224
 225     if (mapping->shared_file)  /* link it in the list */
 226     {
 227         if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
 228         mapping->shared_prev = NULL;
 229         shared_first = mapping;
 230     }
 231
 232     mapping->size_low    = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
 233     mapping->size_high   = 0;
 234     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 235     mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
 236     mapping->protect     = VPROT_IMAGE;
 237
 238     /* sanity check */
 239     if (mapping->header_size > mapping->size_low) goto error;
 240
 241     lseek( fd, filepos, SEEK_SET );
 242     free( sec );
 243     return 1;
 244
 245  error:
 246     lseek( fd, filepos, SEEK_SET );
 247     if (sec) free( sec );
 248     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 249     return 0;
 250 }
 251
 252
 253 static struct object *create_mapping( int size_high, int size_low, int protect,
 254                                       obj_handle_t handle, const WCHAR *name, size_t len )
 255 {
 256     struct mapping *mapping;
 257     int access = 0;
 258
 259     if (!page_mask) init_page_size();
 260
 261     if (!(mapping = create_named_object( &mapping_ops, name, len )))
 262         return NULL;
 263     if (get_error() == STATUS_OBJECT_NAME_COLLISION)
 264         return &mapping->obj;  /* Nothing else to do */
 265
 266     mapping->header_size = 0;
 267     mapping->base        = NULL;
 268     mapping->shared_file = NULL;
 269     mapping->shared_size = 0;
 270
 271     if (protect & VPROT_READ) access |= GENERIC_READ;
 272     if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
 273
 274     if (handle)
 275     {
 276         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 277         if (protect & VPROT_IMAGE)
 278         {
 279             if (!get_image_params( mapping )) goto error;
 280             return &mapping->obj;
 281         }
 282         if (!size_high && !size_low)
 283         {
 284             int flags;
 285             struct get_file_info_reply reply;
 286             struct object *obj = (struct object *)mapping->file;
 287             obj->ops->get_file_info( obj, &reply, &flags );
 288             size_high = reply.size_high;
 289             size_low  = ROUND_SIZE( 0, reply.size_low );
 290         }
 291         else if (!grow_file( mapping->file, size_high, size_low )) goto error;
 292     }
 293     else  /* Anonymous mapping (no associated file) */
 294     {
 295         if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
 296         {
 297             set_error( STATUS_INVALID_PARAMETER );
 298             mapping->file = NULL;
 299             goto error;
 300         }
 301         if (!(mapping->file = create_temp_file( access ))) goto error;
 302         if (!grow_file( mapping->file, size_high, size_low )) goto error;
 303     }
 304     mapping->size_high = size_high;
 305     mapping->size_low  = ROUND_SIZE( 0, size_low );
 306     mapping->protect   = protect;
 307     return &mapping->obj;
 308
 309  error:
 310     release_object( mapping );
 311     return NULL;
 312 }
 313
 314 static void mapping_dump( struct object *obj, int verbose )
 315 {
 316     struct mapping *mapping = (struct mapping *)obj;
 317     assert( obj->ops == &mapping_ops );
 318     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 319              "shared_file=%p shared_size=%08x ",
 320              mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
 321              mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
 322     dump_object_name( &mapping->obj );
 323     fputc( '\n', stderr );
 324 }
 325
 326 static int mapping_get_fd( struct object *obj )
 327 {
 328     struct mapping *mapping = (struct mapping *)obj;
 329     assert( obj->ops == &mapping_ops );
 330     return get_mmap_fd( mapping->file );
 331 }
 332
 333 static int mapping_get_info( struct object *obj, struct get_file_info_reply *reply, int *flags )
 334 {
 335     struct mapping *mapping = (struct mapping *)obj;
 336     struct object *file = (struct object *)mapping->file;
 337
 338     assert( obj->ops == &mapping_ops );
 339     assert( file );
 340     return file->ops->get_file_info( file, reply, flags );
 341 }
 342
 343 static void mapping_destroy( struct object *obj )
 344 {
 345     struct mapping *mapping = (struct mapping *)obj;
 346     assert( obj->ops == &mapping_ops );
 347     if (mapping->file) release_object( mapping->file );
 348     if (mapping->shared_file)
 349     {
 350         release_object( mapping->shared_file );
 351         if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
 352         if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
 353         else shared_first = mapping->shared_next;
 354     }
 355 }
 356
 357 int get_page_size(void)
 358 {
 359     if (!page_mask) init_page_size();
 360     return page_mask + 1;
 361 }
 362
 363 /* create a file mapping */
 364 DECL_HANDLER(create_mapping)
 365 {
 366     struct object *obj;
 367
 368     reply->handle = 0;
 369     if ((obj = create_mapping( req->size_high, req->size_low,
 370                                req->protect, req->file_handle,
 371                                get_req_data(), get_req_data_size() )))
 372     {
 373         int access = FILE_MAP_ALL_ACCESS;
 374         if (!(req->protect & VPROT_WRITE)) access &= ~FILE_MAP_WRITE;
 375         reply->handle = alloc_handle( current->process, obj, access, req->inherit );
 376         release_object( obj );
 377     }
 378 }
 379
 380 /* open a handle to a mapping */
 381 DECL_HANDLER(open_mapping)
 382 {
 383     reply->handle = open_object( get_req_data(), get_req_data_size(),
 384                                  &mapping_ops, req->access, req->inherit );
 385 }
 386
 387 /* get a mapping information */
 388 DECL_HANDLER(get_mapping_info)
 389 {
 390     struct mapping *mapping;
 391
 392     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 393                                                      0, &mapping_ops )))
 394     {
 395         reply->size_high   = mapping->size_high;
 396         reply->size_low    = mapping->size_low;
 397         reply->protect     = mapping->protect;
 398         reply->header_size = mapping->header_size;
 399         reply->base        = mapping->base;
 400         reply->shared_file = 0;
 401         reply->shared_size = mapping->shared_size;
 402         reply->drive_type  = get_file_drive_type( mapping->file );
 403         if (mapping->shared_file)
 404             reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 405                                                GENERIC_READ|GENERIC_WRITE, 0 );
 406         release_object( mapping );
 407     }
 408 }