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