libs/wine/config.c

   1 /*
   2  * Configuration parameters shared between Wine server and clients
   3  *
   4  * Copyright 2002 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 <stdio.h>
  25 #include <stdarg.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <sys/stat.h>
  30 #ifdef HAVE_UNISTD_H
  31 # include <unistd.h>
  32 #endif
  33 #ifdef HAVE_PWD_H
  34 #include <pwd.h>
  35 #endif
  36 #include "wine/library.h"
  37
  38 static const char server_config_dir[] = "/.wine";        /* config dir relative to $HOME */
  39 static const char server_root_prefix[] = "/tmp/.wine-";  /* prefix for server root dir */
  40 static const char server_dir_prefix[] = "/server-";      /* prefix for server dir */
  41
  42 static char *bindir;
  43 static char *dlldir;
  44 static char *datadir;
  45 static char *config_dir;
  46 static char *server_dir;
  47 static char *build_dir;
  48 static char *user_name;
  49 static char *argv0_name;
  50
  51 #ifdef __GNUC__
  52 static void fatal_error( const char *err, ... )  __attribute__((noreturn,format(printf,1,2)));
  53 static void fatal_perror( const char *err, ... )  __attribute__((noreturn,format(printf,1,2)));
  54 #endif
  55
  56 #if defined(__linux__) || defined(__FreeBSD_kernel__ )
  57 #define EXE_LINK "/proc/self/exe"
  58 #elif defined (__FreeBSD__) || defined(__DragonFly__)
  59 #define EXE_LINK "/proc/curproc/file"
  60 #endif
  61
  62 /* die on a fatal error */
  63 static void fatal_error( const char *err, ... )
  64 {
  65     va_list args;
  66
  67     va_start( args, err );
  68     fprintf( stderr, "wine: " );
  69     vfprintf( stderr, err, args );
  70     va_end( args );
  71     exit(1);
  72 }
  73
  74 /* die on a fatal error */
  75 static void fatal_perror( const char *err, ... )
  76 {
  77     va_list args;
  78
  79     va_start( args, err );
  80     fprintf( stderr, "wine: " );
  81     vfprintf( stderr, err, args );
  82     perror( " " );
  83     va_end( args );
  84     exit(1);
  85 }
  86
  87 /* malloc wrapper */
  88 static void *xmalloc( size_t size )
  89 {
  90     void *res;
  91
  92     if (!size) size = 1;
  93     if (!(res = malloc( size ))) fatal_error( "virtual memory exhausted\n");
  94     return res;
  95 }
  96
  97 /* strdup wrapper */
  98 static char *xstrdup( const char *str )
  99 {
 100     size_t len = strlen(str) + 1;
 101     char *res = xmalloc( len );
 102     memcpy( res, str, len );
 103     return res;
 104 }
 105
 106 /* check if a string ends in a given substring */
 107 static inline int strendswith( const char* str, const char* end )
 108 {
 109     size_t len = strlen( str );
 110     size_t tail = strlen( end );
 111     return len >= tail && !strcmp( str + len - tail, end );
 112 }
 113
 114 /* remove all trailing slashes from a path name */
 115 static inline void remove_trailing_slashes( char *path )
 116 {
 117     int len = strlen( path );
 118     while (len > 1 && path[len-1] == '/') path[--len] = 0;
 119 }
 120
 121 /* build a path from the specified dir and name */
 122 static char *build_path( const char *dir, const char *name )
 123 {
 124     size_t len = strlen(dir);
 125     char *ret = xmalloc( len + strlen(name) + 2 );
 126
 127     memcpy( ret, dir, len );
 128     if (len && ret[len-1] != '/') ret[len++] = '/';
 129     strcpy( ret + len, name );
 130     return ret;
 131 }
 132
 133 /* return the directory that contains the library at run-time */
 134 static char *get_runtime_libdir(void)
 135 {
 136 #ifdef HAVE_DLADDR
 137     Dl_info info;
 138     char *libdir;
 139
 140     if (dladdr( get_runtime_libdir, &info ) && info.dli_fname[0] == '/')
 141     {
 142         const char *p = strrchr( info.dli_fname, '/' );
 143         unsigned int len = p - info.dli_fname;
 144         if (!len) len++;  /* include initial slash */
 145         libdir = xmalloc( len + 1 );
 146         memcpy( libdir, info.dli_fname, len );
 147         libdir[len] = 0;
 148         return libdir;
 149     }
 150 #endif /* HAVE_DLADDR */
 151     return NULL;
 152 }
 153
 154 /* return the directory that contains the main exe at run-time */
 155 static char *get_runtime_bindir( const char *argv0 )
 156 {
 157     char *p, *bindir, *cwd;
 158     int len, size;
 159
 160 #ifdef EXE_LINK
 161     for (size = 256; ; size *= 2)
 162     {
 163         int ret;
 164         if (!(bindir = malloc( size ))) break;
 165         if ((ret = readlink( EXE_LINK, bindir, size )) == -1) break;
 166         if (ret != size)
 167         {
 168             bindir[ret] = 0;
 169             if (!(p = strrchr( bindir, '/' ))) break;
 170             if (p == bindir) p++;
 171             *p = 0;
 172             return bindir;
 173         }
 174         free( bindir );
 175     }
 176     free( bindir );
 177 #endif
 178
 179     if (!(p = strrchr( argv0, '/' ))) return NULL;
 180
 181     len = p - argv0;
 182     if (!len) len++;  /* include leading slash */
 183
 184     if (argv0[0] == '/')  /* absolute path */
 185     {
 186         bindir = xmalloc( len + 1 );
 187         memcpy( bindir, argv0, len );
 188         bindir[len] = 0;
 189     }
 190     else
 191     {
 192         /* relative path, make it absolute */
 193         for (size = 256 + len; ; size *= 2)
 194         {
 195             if (!(cwd = malloc( size ))) return NULL;
 196             if (getcwd( cwd, size - len ))
 197             {
 198                 bindir = cwd;
 199                 cwd += strlen(cwd);
 200                 *cwd++ = '/';
 201                 memcpy( cwd, argv0, len );
 202                 cwd[len] = 0;
 203                 break;
 204             }
 205             free( cwd );
 206             if (errno != ERANGE) return NULL;
 207         }
 208     }
 209     return bindir;
 210 }
 211
 212 /* initialize the server directory value */
 213 static void init_server_dir( dev_t dev, ino_t ino )
 214 {
 215     char *p;
 216 #ifdef HAVE_GETUID
 217     const unsigned int uid = getuid();
 218 #else
 219     const unsigned int uid = 0;
 220 #endif
 221
 222     server_dir = xmalloc( sizeof(server_root_prefix) + 32 + sizeof(server_dir_prefix) +
 223                           2*sizeof(dev) + 2*sizeof(ino) );
 224     sprintf( server_dir, "%s%u%s", server_root_prefix, uid, server_dir_prefix );
 225     p = server_dir + strlen(server_dir);
 226
 227     if (dev != (unsigned long)dev)
 228         p += sprintf( p, "%lx%08lx-", (unsigned long)((unsigned long long)dev >> 32), (unsigned long)dev );
 229     else
 230         p += sprintf( p, "%lx-", (unsigned long)dev );
 231
 232     if (ino != (unsigned long)ino)
 233         sprintf( p, "%lx%08lx", (unsigned long)((unsigned long long)ino >> 32), (unsigned long)ino );
 234     else
 235         sprintf( p, "%lx", (unsigned long)ino );
 236 }
 237
 238 /* retrieve the default dll dir */
 239 const char *get_dlldir( const char **default_dlldir )
 240 {
 241     *default_dlldir = DLLDIR;
 242     return dlldir;
 243 }
 244
 245 /* initialize all the paths values */
 246 static void init_paths(void)
 247 {
 248     struct stat st;
 249
 250     const char *home = getenv( "HOME" );
 251     const char *user = NULL;
 252     const char *prefix = getenv( "WINEPREFIX" );
 253
 254 #ifdef HAVE_GETPWUID
 255     char uid_str[32];
 256     struct passwd *pwd = getpwuid( getuid() );
 257
 258     if (pwd)
 259     {
 260         user = pwd->pw_name;
 261         if (!home) home = pwd->pw_dir;
 262     }
 263     if (!user)
 264     {
 265         sprintf( uid_str, "%lu", (unsigned long)getuid() );
 266         user = uid_str;
 267     }
 268 #else  /* HAVE_GETPWUID */
 269     if (!(user = getenv( "USER" )))
 270         fatal_error( "cannot determine your user name, set the USER environment variable\n" );
 271 #endif  /* HAVE_GETPWUID */
 272     user_name = xstrdup( user );
 273
 274     /* build config_dir */
 275
 276     if (prefix)
 277     {
 278         config_dir = xstrdup( prefix );
 279         remove_trailing_slashes( config_dir );
 280         if (config_dir[0] != '/')
 281             fatal_error( "invalid directory %s in WINEPREFIX: not an absolute path\n", prefix );
 282         if (stat( config_dir, &st ) == -1)
 283         {
 284             if (errno == ENOENT) return;  /* will be created later on */
 285             fatal_perror( "cannot open %s as specified in WINEPREFIX", config_dir );
 286         }
 287     }
 288     else
 289     {
 290         if (!home) fatal_error( "could not determine your home directory\n" );
 291         if (home[0] != '/') fatal_error( "your home directory %s is not an absolute path\n", home );
 292         config_dir = xmalloc( strlen(home) + sizeof(server_config_dir) );
 293         strcpy( config_dir, home );
 294         remove_trailing_slashes( config_dir );
 295         strcat( config_dir, server_config_dir );
 296         if (stat( config_dir, &st ) == -1)
 297         {
 298             if (errno == ENOENT) return;  /* will be created later on */
 299             fatal_perror( "cannot open %s", config_dir );
 300         }
 301     }
 302     if (!S_ISDIR(st.st_mode)) fatal_error( "%s is not a directory\n", config_dir );
 303 #ifdef HAVE_GETUID
 304     if (st.st_uid != getuid()) fatal_error( "%s is not owned by you\n", config_dir );
 305 #endif
 306
 307     init_server_dir( st.st_dev, st.st_ino );
 308 }
 309
 310 /* check if bindir is valid by checking for wineserver */
 311 static int is_valid_bindir( const char *bindir )
 312 {
 313     struct stat st;
 314     char *path = build_path( bindir, "wineserver" );
 315     int ret = (stat( path, &st ) != -1);
 316     free( path );
 317     return ret;
 318 }
 319
 320 /* check if basedir is a valid build dir by checking for wineserver and ntdll */
 321 /* helper for running_from_build_dir */
 322 static inline int is_valid_build_dir( char *basedir, int baselen )
 323 {
 324     struct stat st;
 325
 326     strcpy( basedir + baselen, "/server/wineserver" );
 327     if (stat( basedir, &st ) == -1) return 0;  /* no wineserver found */
 328     /* check for ntdll too to make sure */
 329     strcpy( basedir + baselen, "/dlls/ntdll/ntdll.dll.so" );
 330     if (stat( basedir, &st ) == -1) return 0;  /* no ntdll found */
 331
 332     basedir[baselen] = 0;
 333     return 1;
 334 }
 335
 336 /* check if we are running from the build directory */
 337 static char *running_from_build_dir( const char *basedir )
 338 {
 339     const char *p;
 340     char *path;
 341
 342     /* remove last component from basedir */
 343     p = basedir + strlen(basedir) - 1;
 344     while (p > basedir && *p == '/') p--;
 345     while (p > basedir && *p != '/') p--;
 346     if (p == basedir) return NULL;
 347     path = xmalloc( p - basedir + sizeof("/dlls/ntdll/ntdll.dll.so") );
 348     memcpy( path, basedir, p - basedir );
 349
 350     if (!is_valid_build_dir( path, p - basedir ))
 351     {
 352         /* remove another component */
 353         while (p > basedir && *p == '/') p--;
 354         while (p > basedir && *p != '/') p--;
 355         if (p == basedir || !is_valid_build_dir( path, p - basedir ))
 356         {
 357             free( path );
 358             return NULL;
 359         }
 360     }
 361     return path;
 362 }
 363
 364 /* initialize the argv0 path */
 365 void wine_init_argv0_path( const char *argv0 )
 366 {
 367     const char *basename;
 368     char *libdir;
 369
 370     if (!(basename = strrchr( argv0, '/' ))) basename = argv0;
 371     else basename++;
 372
 373     bindir = get_runtime_bindir( argv0 );
 374     libdir = get_runtime_libdir();
 375
 376     if (bindir && !is_valid_bindir( bindir ))
 377     {
 378         build_dir = running_from_build_dir( bindir );
 379         free( bindir );
 380         bindir = NULL;
 381     }
 382     if (libdir && !bindir && !build_dir)
 383     {
 384         build_dir = running_from_build_dir( libdir );
 385         if (!build_dir) bindir = build_path( libdir, LIB_TO_BINDIR );
 386     }
 387
 388     if (build_dir)
 389     {
 390         argv0_name = build_path( "loader/", basename );
 391     }
 392     else
 393     {
 394         if (libdir) dlldir = build_path( libdir, LIB_TO_DLLDIR );
 395         else if (bindir) dlldir = build_path( bindir, BIN_TO_DLLDIR );
 396
 397         if (bindir) datadir = build_path( bindir, BIN_TO_DATADIR );
 398         argv0_name = xstrdup( basename );
 399     }
 400     free( libdir );
 401 }
 402
 403 /* return the configuration directory ($WINEPREFIX or $HOME/.wine) */
 404 const char *wine_get_config_dir(void)
 405 {
 406     if (!config_dir) init_paths();
 407     return config_dir;
 408 }
 409
 410 /* retrieve the wine data dir */
 411 const char *wine_get_data_dir(void)
 412 {
 413     return datadir;
 414 }
 415
 416 /* retrieve the wine build dir (if we are running from there) */
 417 const char *wine_get_build_dir(void)
 418 {
 419     return build_dir;
 420 }
 421
 422 /* return the full name of the server directory (the one containing the socket) */
 423 const char *wine_get_server_dir(void)
 424 {
 425     if (!server_dir)
 426     {
 427         if (!config_dir) init_paths();
 428         else
 429         {
 430             struct stat st;
 431
 432             if (stat( config_dir, &st ) == -1)
 433             {
 434                 if (errno != ENOENT) fatal_error( "cannot stat %s\n", config_dir );
 435                 return NULL;  /* will have to try again once config_dir has been created */
 436             }
 437             init_server_dir( st.st_dev, st.st_ino );
 438         }
 439     }
 440     return server_dir;
 441 }
 442
 443 /* return the current user name */
 444 const char *wine_get_user_name(void)
 445 {
 446     if (!user_name) init_paths();
 447     return user_name;
 448 }
 449
 450 /* return the standard version string */
 451 const char *wine_get_version(void)
 452 {
 453     return PACKAGE_VERSION;
 454 }
 455
 456 /* return the build id string */
 457 const char *wine_get_build_id(void)
 458 {
 459     extern const char wine_build[];
 460     return wine_build;
 461 }
 462
 463 /* exec a binary using the preloader if requested; helper for wine_exec_wine_binary */
 464 static void preloader_exec( char **argv, int use_preloader )
 465 {
 466     if (use_preloader)
 467     {
 468         static const char preloader[] = "wine-preloader";
 469         static const char preloader64[] = "wine64-preloader";
 470         char *p, *full_name;
 471         char **last_arg = argv, **new_argv;
 472
 473         if (!(p = strrchr( argv[0], '/' ))) p = argv[0];
 474         else p++;
 475
 476         full_name = xmalloc( p - argv[0] + sizeof(preloader64) );
 477         memcpy( full_name, argv[0], p - argv[0] );
 478         if (strendswith( p, "64" ))
 479             memcpy( full_name + (p - argv[0]), preloader64, sizeof(preloader64) );
 480         else
 481             memcpy( full_name + (p - argv[0]), preloader, sizeof(preloader) );
 482
 483         /* make a copy of argv */
 484         while (*last_arg) last_arg++;
 485         new_argv = xmalloc( (last_arg - argv + 2) * sizeof(*argv) );
 486         memcpy( new_argv + 1, argv, (last_arg - argv + 1) * sizeof(*argv) );
 487         new_argv[0] = full_name;
 488         execv( full_name, new_argv );
 489         free( new_argv );
 490         free( full_name );
 491     }
 492     execv( argv[0], argv );
 493 }
 494
 495 /* exec a wine internal binary (either the wine loader or the wine server) */
 496 void wine_exec_wine_binary( const char *name, char **argv, const char *env_var )
 497 {
 498     const char *path, *pos, *ptr;
 499     int use_preloader;
 500
 501     if (!name) name = argv0_name;  /* no name means default loader */
 502
 503 #ifdef linux
 504     use_preloader = !strendswith( name, "wineserver" );
 505 #else
 506     use_preloader = 0;
 507 #endif
 508
 509     if ((ptr = strrchr( name, '/' )))
 510     {
 511         /* if we are in build dir and name contains a path, try that */
 512         if (build_dir)
 513         {
 514             argv[0] = build_path( build_dir, name );
 515             preloader_exec( argv, use_preloader );
 516             free( argv[0] );
 517         }
 518         name = ptr + 1;  /* get rid of path */
 519     }
 520
 521     /* first, bin directory from the current libdir or argv0 */
 522     if (bindir)
 523     {
 524         argv[0] = build_path( bindir, name );
 525         preloader_exec( argv, use_preloader );
 526         free( argv[0] );
 527     }
 528
 529     /* then specified environment variable */
 530     if (env_var)
 531     {
 532         argv[0] = (char *)env_var;
 533         preloader_exec( argv, use_preloader );
 534     }
 535
 536     /* now search in the Unix path */
 537     if ((path = getenv( "PATH" )))
 538     {
 539         argv[0] = xmalloc( strlen(path) + strlen(name) + 2 );
 540         pos = path;
 541         for (;;)
 542         {
 543             while (*pos == ':') pos++;
 544             if (!*pos) break;
 545             if (!(ptr = strchr( pos, ':' ))) ptr = pos + strlen(pos);
 546             memcpy( argv[0], pos, ptr - pos );
 547             strcpy( argv[0] + (ptr - pos), "/" );
 548             strcat( argv[0] + (ptr - pos), name );
 549             preloader_exec( argv, use_preloader );
 550             pos = ptr;
 551         }
 552         free( argv[0] );
 553     }
 554
 555     /* and finally try BINDIR */
 556     argv[0] = build_path( BINDIR, name );
 557     preloader_exec( argv, use_preloader );
 558     free( argv[0] );
 559 }