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_exedir(void)
 156 {
 157 #ifdef EXE_LINK
 158     char *p, *bindir;
 159     int size;
 160
 161     for (size = 256; ; size *= 2)
 162     {
 163         int ret;
 164         if (!(bindir = malloc( size ))) return NULL;
 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     return NULL;
 179 }
 180
 181 /* return the base directory from argv0 */
 182 static char *get_runtime_argvdir( const char *argv0 )
 183 {
 184     char *p, *bindir, *cwd;
 185     int len, size;
 186
 187     if (!(p = strrchr( argv0, '/' ))) return NULL;
 188
 189     len = p - argv0;
 190     if (!len) len++;  /* include leading slash */
 191
 192     if (argv0[0] == '/')  /* absolute path */
 193     {
 194         bindir = xmalloc( len + 1 );
 195         memcpy( bindir, argv0, len );
 196         bindir[len] = 0;
 197     }
 198     else
 199     {
 200         /* relative path, make it absolute */
 201         for (size = 256 + len; ; size *= 2)
 202         {
 203             if (!(cwd = malloc( size ))) return NULL;
 204             if (getcwd( cwd, size - len ))
 205             {
 206                 bindir = cwd;
 207                 cwd += strlen(cwd);
 208                 *cwd++ = '/';
 209                 memcpy( cwd, argv0, len );
 210                 cwd[len] = 0;
 211                 break;
 212             }
 213             free( cwd );
 214             if (errno != ERANGE) return NULL;
 215         }
 216     }
 217     return bindir;
 218 }
 219
 220 /* initialize the server directory value */
 221 static void init_server_dir( dev_t dev, ino_t ino )
 222 {
 223     char *p, *root;
 224
 225 #ifdef __ANDROID__  /* there's no /tmp dir on Android */
 226     root = build_path( config_dir, ".wineserver" );
 227 #elif defined(HAVE_GETUID)
 228     root = xmalloc( sizeof(server_root_prefix) + 12 );
 229     sprintf( root, "%s-%u", server_root_prefix, getuid() );
 230 #else
 231     root = xstrdup( server_root_prefix );
 232 #endif
 233
 234     server_dir = xmalloc( strlen(root) + sizeof(server_dir_prefix) + 2*sizeof(dev) + 2*sizeof(ino) + 2 );
 235     strcpy( server_dir, root );
 236     strcat( server_dir, server_dir_prefix );
 237     p = server_dir + strlen(server_dir);
 238
 239     if (dev != (unsigned long)dev)
 240         p += sprintf( p, "%lx%08lx-", (unsigned long)((unsigned long long)dev >> 32), (unsigned long)dev );
 241     else
 242         p += sprintf( p, "%lx-", (unsigned long)dev );
 243
 244     if (ino != (unsigned long)ino)
 245         sprintf( p, "%lx%08lx", (unsigned long)((unsigned long long)ino >> 32), (unsigned long)ino );
 246     else
 247         sprintf( p, "%lx", (unsigned long)ino );
 248     free( root );
 249 }
 250
 251 /* retrieve the default dll dir */
 252 const char *get_dlldir( const char **default_dlldir, const char **dll_prefix )
 253 {
 254     *default_dlldir = DLLDIR;
 255     *dll_prefix = "/" DLLPREFIX;
 256     return dlldir;
 257 }
 258
 259 /* initialize all the paths values */
 260 static void init_paths(void)
 261 {
 262     struct stat st;
 263
 264     const char *home = getenv( "HOME" );
 265     const char *user = NULL;
 266     const char *prefix = getenv( "WINEPREFIX" );
 267
 268 #ifdef HAVE_GETPWUID
 269     char uid_str[32];
 270     struct passwd *pwd = getpwuid( getuid() );
 271
 272     if (pwd)
 273     {
 274         user = pwd->pw_name;
 275         if (!home) home = pwd->pw_dir;
 276     }
 277     if (!user)
 278     {
 279         sprintf( uid_str, "%lu", (unsigned long)getuid() );
 280         user = uid_str;
 281     }
 282 #else  /* HAVE_GETPWUID */
 283     if (!(user = getenv( "USER" )))
 284         fatal_error( "cannot determine your user name, set the USER environment variable\n" );
 285 #endif  /* HAVE_GETPWUID */
 286     user_name = xstrdup( user );
 287
 288     /* build config_dir */
 289
 290     if (prefix)
 291     {
 292         config_dir = xstrdup( prefix );
 293         remove_trailing_slashes( config_dir );
 294         if (config_dir[0] != '/')
 295             fatal_error( "invalid directory %s in WINEPREFIX: not an absolute path\n", prefix );
 296         if (stat( config_dir, &st ) == -1)
 297         {
 298             if (errno == ENOENT) return;  /* will be created later on */
 299             fatal_perror( "cannot open %s as specified in WINEPREFIX", config_dir );
 300         }
 301     }
 302     else
 303     {
 304         if (!home) fatal_error( "could not determine your home directory\n" );
 305         if (home[0] != '/') fatal_error( "your home directory %s is not an absolute path\n", home );
 306         config_dir = xmalloc( strlen(home) + sizeof(server_config_dir) );
 307         strcpy( config_dir, home );
 308         remove_trailing_slashes( config_dir );
 309         strcat( config_dir, server_config_dir );
 310         if (stat( config_dir, &st ) == -1)
 311         {
 312             if (errno == ENOENT) return;  /* will be created later on */
 313             fatal_perror( "cannot open %s", config_dir );
 314         }
 315     }
 316     if (!S_ISDIR(st.st_mode)) fatal_error( "%s is not a directory\n", config_dir );
 317 #ifdef HAVE_GETUID
 318     if (st.st_uid != getuid()) fatal_error( "%s is not owned by you\n", config_dir );
 319 #endif
 320
 321     init_server_dir( st.st_dev, st.st_ino );
 322 }
 323
 324 /* check if bindir is valid by checking for wineserver */
 325 static int is_valid_bindir( const char *bindir )
 326 {
 327     struct stat st;
 328     char *path = build_path( bindir, "wineserver" );
 329     int ret = (stat( path, &st ) != -1);
 330     free( path );
 331     return ret;
 332 }
 333
 334 /* check if basedir is a valid build dir by checking for wineserver and ntdll */
 335 /* helper for running_from_build_dir */
 336 static inline int is_valid_build_dir( char *basedir, int baselen )
 337 {
 338     struct stat st;
 339
 340     strcpy( basedir + baselen, "/server/wineserver" );
 341     if (stat( basedir, &st ) == -1) return 0;  /* no wineserver found */
 342     /* check for ntdll too to make sure */
 343     strcpy( basedir + baselen, "/dlls/ntdll/ntdll.dll.so" );
 344     if (stat( basedir, &st ) == -1) return 0;  /* no ntdll found */
 345
 346     basedir[baselen] = 0;
 347     return 1;
 348 }
 349
 350 /* check if we are running from the build directory */
 351 static char *running_from_build_dir( const char *basedir )
 352 {
 353     const char *p;
 354     char *path;
 355
 356     /* remove last component from basedir */
 357     p = basedir + strlen(basedir) - 1;
 358     while (p > basedir && *p == '/') p--;
 359     while (p > basedir && *p != '/') p--;
 360     if (p == basedir) return NULL;
 361     path = xmalloc( p - basedir + sizeof("/dlls/ntdll/ntdll.dll.so") );
 362     memcpy( path, basedir, p - basedir );
 363
 364     if (!is_valid_build_dir( path, p - basedir ))
 365     {
 366         /* remove another component */
 367         while (p > basedir && *p == '/') p--;
 368         while (p > basedir && *p != '/') p--;
 369         if (p == basedir || !is_valid_build_dir( path, p - basedir ))
 370         {
 371             free( path );
 372             return NULL;
 373         }
 374     }
 375     return path;
 376 }
 377
 378 /* initialize the argv0 path */
 379 void wine_init_argv0_path( const char *argv0 )
 380 {
 381     const char *basename;
 382     char *libdir;
 383
 384     if (!(basename = strrchr( argv0, '/' ))) basename = argv0;
 385     else basename++;
 386
 387     bindir = get_runtime_exedir();
 388     if (bindir && !is_valid_bindir( bindir ))
 389     {
 390         build_dir = running_from_build_dir( bindir );
 391         free( bindir );
 392         bindir = NULL;
 393     }
 394
 395     libdir = get_runtime_libdir();
 396     if (libdir && !bindir && !build_dir)
 397     {
 398         build_dir = running_from_build_dir( libdir );
 399         if (!build_dir) bindir = build_path( libdir, LIB_TO_BINDIR );
 400     }
 401
 402     if (!libdir && !bindir && !build_dir)
 403     {
 404         bindir = get_runtime_argvdir( argv0 );
 405         if (bindir && !is_valid_bindir( bindir ))
 406         {
 407             build_dir = running_from_build_dir( bindir );
 408             free( bindir );
 409             bindir = NULL;
 410         }
 411     }
 412
 413     if (build_dir)
 414     {
 415         argv0_name = build_path( "loader/", basename );
 416     }
 417     else
 418     {
 419         if (libdir) dlldir = build_path( libdir, LIB_TO_DLLDIR );
 420         else if (bindir) dlldir = build_path( bindir, BIN_TO_DLLDIR );
 421
 422         if (bindir) datadir = build_path( bindir, BIN_TO_DATADIR );
 423         argv0_name = xstrdup( basename );
 424     }
 425     free( libdir );
 426 }
 427
 428 /* return the configuration directory ($WINEPREFIX or $HOME/.wine) */
 429 const char *wine_get_config_dir(void)
 430 {
 431     if (!config_dir) init_paths();
 432     return config_dir;
 433 }
 434
 435 /* retrieve the wine data dir */
 436 const char *wine_get_data_dir(void)
 437 {
 438     return datadir;
 439 }
 440
 441 /* retrieve the wine build dir (if we are running from there) */
 442 const char *wine_get_build_dir(void)
 443 {
 444     return build_dir;
 445 }
 446
 447 /* return the full name of the server directory (the one containing the socket) */
 448 const char *wine_get_server_dir(void)
 449 {
 450     if (!server_dir)
 451     {
 452         if (!config_dir) init_paths();
 453         else
 454         {
 455             struct stat st;
 456
 457             if (stat( config_dir, &st ) == -1)
 458             {
 459                 if (errno != ENOENT) fatal_error( "cannot stat %s\n", config_dir );
 460                 return NULL;  /* will have to try again once config_dir has been created */
 461             }
 462             init_server_dir( st.st_dev, st.st_ino );
 463         }
 464     }
 465     return server_dir;
 466 }
 467
 468 /* return the current user name */
 469 const char *wine_get_user_name(void)
 470 {
 471     if (!user_name) init_paths();
 472     return user_name;
 473 }
 474
 475 /* return the standard version string */
 476 const char *wine_get_version(void)
 477 {
 478     return PACKAGE_VERSION;
 479 }
 480
 481 /* return the build id string */
 482 const char *wine_get_build_id(void)
 483 {
 484     extern const char wine_build[];
 485     return wine_build;
 486 }
 487
 488 /* exec a binary using the preloader if requested; helper for wine_exec_wine_binary */
 489 static void preloader_exec( char **argv, int use_preloader )
 490 {
 491     if (use_preloader)
 492     {
 493         static const char preloader[] = "wine-preloader";
 494         static const char preloader64[] = "wine64-preloader";
 495         char *p, *full_name;
 496         char **last_arg = argv, **new_argv;
 497
 498         if (!(p = strrchr( argv[0], '/' ))) p = argv[0];
 499         else p++;
 500
 501         full_name = xmalloc( p - argv[0] + sizeof(preloader64) );
 502         memcpy( full_name, argv[0], p - argv[0] );
 503         if (strendswith( p, "64" ))
 504             memcpy( full_name + (p - argv[0]), preloader64, sizeof(preloader64) );
 505         else
 506             memcpy( full_name + (p - argv[0]), preloader, sizeof(preloader) );
 507
 508         /* make a copy of argv */
 509         while (*last_arg) last_arg++;
 510         new_argv = xmalloc( (last_arg - argv + 2) * sizeof(*argv) );
 511         memcpy( new_argv + 1, argv, (last_arg - argv + 1) * sizeof(*argv) );
 512         new_argv[0] = full_name;
 513         execv( full_name, new_argv );
 514         free( new_argv );
 515         free( full_name );
 516     }
 517     execv( argv[0], argv );
 518 }
 519
 520 /* exec a wine internal binary (either the wine loader or the wine server) */
 521 void wine_exec_wine_binary( const char *name, char **argv, const char *env_var )
 522 {
 523     const char *path, *pos, *ptr;
 524     int use_preloader;
 525
 526     if (!name) name = argv0_name;  /* no name means default loader */
 527
 528 #ifdef linux
 529     use_preloader = !strendswith( name, "wineserver" );
 530 #else
 531     use_preloader = 0;
 532 #endif
 533
 534     if ((ptr = strrchr( name, '/' )))
 535     {
 536         /* if we are in build dir and name contains a path, try that */
 537         if (build_dir)
 538         {
 539             argv[0] = build_path( build_dir, name );
 540             preloader_exec( argv, use_preloader );
 541             free( argv[0] );
 542         }
 543         name = ptr + 1;  /* get rid of path */
 544     }
 545
 546     /* first, bin directory from the current libdir or argv0 */
 547     if (bindir)
 548     {
 549         argv[0] = build_path( bindir, name );
 550         preloader_exec( argv, use_preloader );
 551         free( argv[0] );
 552     }
 553
 554     /* then specified environment variable */
 555     if (env_var)
 556     {
 557         argv[0] = (char *)env_var;
 558         preloader_exec( argv, use_preloader );
 559     }
 560
 561     /* now search in the Unix path */
 562     if ((path = getenv( "PATH" )))
 563     {
 564         argv[0] = xmalloc( strlen(path) + strlen(name) + 2 );
 565         pos = path;
 566         for (;;)
 567         {
 568             while (*pos == ':') pos++;
 569             if (!*pos) break;
 570             if (!(ptr = strchr( pos, ':' ))) ptr = pos + strlen(pos);
 571             memcpy( argv[0], pos, ptr - pos );
 572             strcpy( argv[0] + (ptr - pos), "/" );
 573             strcat( argv[0] + (ptr - pos), name );
 574             preloader_exec( argv, use_preloader );
 575             pos = ptr;
 576         }
 577         free( argv[0] );
 578     }
 579
 580     /* and finally try BINDIR */
 581     argv[0] = build_path( BINDIR, name );
 582     preloader_exec( argv, use_preloader );
 583     free( argv[0] );
 584 }