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 /* die on a fatal error */
  57 static void fatal_error( const char *err, ... )
  58 {
  59     va_list args;
  60
  61     va_start( args, err );
  62     fprintf( stderr, "wine: " );
  63     vfprintf( stderr, err, args );
  64     va_end( args );
  65     exit(1);
  66 }
  67
  68 /* die on a fatal error */
  69 static void fatal_perror( const char *err, ... )
  70 {
  71     va_list args;
  72
  73     va_start( args, err );
  74     fprintf( stderr, "wine: " );
  75     vfprintf( stderr, err, args );
  76     perror( " " );
  77     va_end( args );
  78     exit(1);
  79 }
  80
  81 /* malloc wrapper */
  82 static void *xmalloc( size_t size )
  83 {
  84     void *res;
  85
  86     if (!size) size = 1;
  87     if (!(res = malloc( size ))) fatal_error( "virtual memory exhausted\n");
  88     return res;
  89 }
  90
  91 /* strdup wrapper */
  92 static char *xstrdup( const char *str )
  93 {
  94     size_t len = strlen(str) + 1;
  95     char *res = xmalloc( len );
  96     memcpy( res, str, len );
  97     return res;
  98 }
  99
 100 /* remove all trailing slashes from a path name */
 101 static inline void remove_trailing_slashes( char *path )
 102 {
 103     int len = strlen( path );
 104     while (len > 1 && path[len-1] == '/') path[--len] = 0;
 105 }
 106
 107 /* build a path from the specified dir and name */
 108 static char *build_path( const char *dir, const char *name )
 109 {
 110     size_t len = strlen(dir);
 111     char *ret = xmalloc( len + strlen(name) + 2 );
 112
 113     memcpy( ret, dir, len );
 114     if (len && ret[len-1] != '/') ret[len++] = '/';
 115     strcpy( ret + len, name );
 116     return ret;
 117 }
 118
 119 /* return the directory that contains the library at run-time */
 120 static char *get_runtime_libdir(void)
 121 {
 122 #ifdef HAVE_DLADDR
 123     Dl_info info;
 124     char *libdir;
 125
 126     if (dladdr( get_runtime_libdir, &info ) && info.dli_fname[0] == '/')
 127     {
 128         const char *p = strrchr( info.dli_fname, '/' );
 129         unsigned int len = p - info.dli_fname;
 130         if (!len) len++;  /* include initial slash */
 131         libdir = xmalloc( len + 1 );
 132         memcpy( libdir, info.dli_fname, len );
 133         libdir[len] = 0;
 134         return libdir;
 135     }
 136 #endif /* HAVE_DLADDR */
 137     return NULL;
 138 }
 139
 140 /* return the directory that contains the main exe at run-time */
 141 static char *get_runtime_bindir( const char *argv0 )
 142 {
 143     char *p, *bindir, *cwd;
 144     size_t len, size;
 145
 146 #ifdef linux
 147     for (size = 256; ; size *= 2)
 148     {
 149         int ret;
 150         if (!(bindir = malloc( size ))) break;
 151         if ((ret = readlink( "/proc/self/exe", bindir, size )) == -1) break;
 152         if (ret != size)
 153         {
 154             if (!(p = memrchr( bindir, '/', ret ))) break;
 155             if (p == bindir) p++;
 156             *p = 0;
 157             return bindir;
 158         }
 159         free( bindir );
 160     }
 161     free( bindir );
 162 #endif
 163
 164     if (!(p = strrchr( argv0, '/' ))) return NULL;
 165
 166     len = p - argv0;
 167     if (!len) len++;  /* include leading slash */
 168
 169     if (argv0[0] == '/')  /* absolute path */
 170     {
 171         bindir = xmalloc( len + 1 );
 172         memcpy( bindir, argv0, len );
 173         bindir[len] = 0;
 174     }
 175     else
 176     {
 177         /* relative path, make it absolute */
 178         for (size = 256 + len; ; size *= 2)
 179         {
 180             if (!(cwd = malloc( size ))) return NULL;
 181             if (getcwd( cwd, size - len ))
 182             {
 183                 bindir = cwd;
 184                 cwd += strlen(cwd);
 185                 *cwd++ = '/';
 186                 memcpy( cwd, argv0, len );
 187                 cwd[len] = 0;
 188                 break;
 189             }
 190             free( cwd );
 191             if (errno != ERANGE) return NULL;
 192         }
 193     }
 194     return bindir;
 195 }
 196
 197 /* initialize the server directory value */
 198 static void init_server_dir( dev_t dev, ino_t ino )
 199 {
 200     char *p;
 201 #ifdef HAVE_GETUID
 202     const unsigned int uid = getuid();
 203 #else
 204     const unsigned int uid = 0;
 205 #endif
 206
 207     server_dir = xmalloc( sizeof(server_root_prefix) + 32 + sizeof(server_dir_prefix) +
 208                           2*sizeof(dev) + 2*sizeof(ino) );
 209     sprintf( server_dir, "%s%u%s", server_root_prefix, uid, server_dir_prefix );
 210     p = server_dir + strlen(server_dir);
 211
 212     if (sizeof(dev) > sizeof(unsigned long) && dev > ~0UL)
 213         p += sprintf( p, "%lx%08lx-", (unsigned long)((unsigned long long)dev >> 32), (unsigned long)dev );
 214     else
 215         p += sprintf( p, "%lx-", (unsigned long)dev );
 216
 217     if (sizeof(ino) > sizeof(unsigned long) && ino > ~0UL)
 218         sprintf( p, "%lx%08lx", (unsigned long)((unsigned long long)ino >> 32), (unsigned long)ino );
 219     else
 220         sprintf( p, "%lx", (unsigned long)ino );
 221 }
 222
 223 /* retrieve the default dll dir */
 224 const char *get_dlldir( const char **default_dlldir )
 225 {
 226     *default_dlldir = DLLDIR;
 227     return dlldir;
 228 }
 229
 230 /* initialize all the paths values */
 231 static void init_paths(void)
 232 {
 233     struct stat st;
 234
 235     const char *home = getenv( "HOME" );
 236     const char *user = NULL;
 237     const char *prefix = getenv( "WINEPREFIX" );
 238
 239 #ifdef HAVE_GETPWUID
 240     char uid_str[32];
 241     struct passwd *pwd = getpwuid( getuid() );
 242
 243     if (pwd)
 244     {
 245         user = pwd->pw_name;
 246         if (!home) home = pwd->pw_dir;
 247     }
 248     if (!user)
 249     {
 250         sprintf( uid_str, "%lu", (unsigned long)getuid() );
 251         user = uid_str;
 252     }
 253 #else  /* HAVE_GETPWUID */
 254     if (!(user = getenv( "USER" )))
 255         fatal_error( "cannot determine your user name, set the USER environment variable\n" );
 256 #endif  /* HAVE_GETPWUID */
 257     user_name = xstrdup( user );
 258
 259     /* build config_dir */
 260
 261     if (prefix)
 262     {
 263         config_dir = xstrdup( prefix );
 264         remove_trailing_slashes( config_dir );
 265         if (config_dir[0] != '/')
 266             fatal_error( "invalid directory %s in WINEPREFIX: not an absolute path\n", prefix );
 267         if (stat( config_dir, &st ) == -1)
 268         {
 269             if (errno == ENOENT) return;  /* will be created later on */
 270             fatal_perror( "cannot open %s as specified in WINEPREFIX", config_dir );
 271         }
 272     }
 273     else
 274     {
 275         if (!home) fatal_error( "could not determine your home directory\n" );
 276         if (home[0] != '/') fatal_error( "your home directory %s is not an absolute path\n", home );
 277         config_dir = xmalloc( strlen(home) + sizeof(server_config_dir) );
 278         strcpy( config_dir, home );
 279         remove_trailing_slashes( config_dir );
 280         strcat( config_dir, server_config_dir );
 281         if (stat( config_dir, &st ) == -1)
 282         {
 283             if (errno == ENOENT) return;  /* will be created later on */
 284             fatal_perror( "cannot open %s", config_dir );
 285         }
 286     }
 287     if (!S_ISDIR(st.st_mode)) fatal_error( "%s is not a directory\n", config_dir );
 288 #ifdef HAVE_GETUID
 289     if (st.st_uid != getuid()) fatal_error( "%s is not owned by you\n", config_dir );
 290 #endif
 291
 292     init_server_dir( st.st_dev, st.st_ino );
 293 }
 294
 295 /* check if bindir is valid by checking for wineserver */
 296 static int is_valid_bindir( const char *bindir )
 297 {
 298     struct stat st;
 299     char *path = build_path( bindir, "wineserver" );
 300     int ret = (stat( path, &st ) != -1);
 301     free( path );
 302     return ret;
 303 }
 304
 305 /* check if basedir is a valid build dir by checking for wineserver and ntdll */
 306 /* helper for running_from_build_dir */
 307 static inline int is_valid_build_dir( char *basedir, int baselen )
 308 {
 309     struct stat st;
 310
 311     strcpy( basedir + baselen, "/server/wineserver" );
 312     if (stat( basedir, &st ) == -1) return 0;  /* no wineserver found */
 313     /* check for ntdll too to make sure */
 314     strcpy( basedir + baselen, "/dlls/ntdll/ntdll.dll.so" );
 315     if (stat( basedir, &st ) == -1) return 0;  /* no ntdll found */
 316
 317     basedir[baselen] = 0;
 318     return 1;
 319 }
 320
 321 /* check if we are running from the build directory */
 322 static char *running_from_build_dir( const char *basedir )
 323 {
 324     const char *p;
 325     char *path;
 326
 327     /* remove last component from basedir */
 328     p = basedir + strlen(basedir) - 1;
 329     while (p > basedir && *p == '/') p--;
 330     while (p > basedir && *p != '/') p--;
 331     if (p == basedir) return NULL;
 332     path = xmalloc( p - basedir + sizeof("/dlls/ntdll/ntdll.dll.so") );
 333     memcpy( path, basedir, p - basedir );
 334
 335     if (!is_valid_build_dir( path, p - basedir ))
 336     {
 337         /* remove another component */
 338         while (p > basedir && *p == '/') p--;
 339         while (p > basedir && *p != '/') p--;
 340         if (p == basedir || !is_valid_build_dir( path, p - basedir ))
 341         {
 342             free( path );
 343             return NULL;
 344         }
 345     }
 346     return path;
 347 }
 348
 349 /* initialize the argv0 path */
 350 void wine_init_argv0_path( const char *argv0 )
 351 {
 352     const char *basename;
 353     char *libdir;
 354
 355     if (!(basename = strrchr( argv0, '/' ))) basename = argv0;
 356     else basename++;
 357
 358     bindir = get_runtime_bindir( argv0 );
 359     libdir = get_runtime_libdir();
 360
 361     if (bindir && !is_valid_bindir( bindir ))
 362     {
 363         build_dir = running_from_build_dir( bindir );
 364         free( bindir );
 365         bindir = NULL;
 366     }
 367     if (libdir && !bindir && !build_dir)
 368     {
 369         build_dir = running_from_build_dir( libdir );
 370         if (!build_dir) bindir = build_path( libdir, LIB_TO_BINDIR );
 371     }
 372
 373     if (build_dir)
 374     {
 375         argv0_name = build_path( "loader/", basename );
 376     }
 377     else
 378     {
 379         if (libdir) dlldir = build_path( libdir, LIB_TO_DLLDIR );
 380         else if (bindir) dlldir = build_path( bindir, BIN_TO_DLLDIR );
 381
 382         if (bindir) datadir = build_path( bindir, BIN_TO_DATADIR );
 383         argv0_name = xstrdup( basename );
 384     }
 385     free( libdir );
 386 }
 387
 388 /* return the configuration directory ($WINEPREFIX or $HOME/.wine) */
 389 const char *wine_get_config_dir(void)
 390 {
 391     if (!config_dir) init_paths();
 392     return config_dir;
 393 }
 394
 395 /* retrieve the wine data dir */
 396 const char *wine_get_data_dir(void)
 397 {
 398     return datadir;
 399 }
 400
 401 /* retrieve the wine build dir (if we are running from there) */
 402 const char *wine_get_build_dir(void)
 403 {
 404     return build_dir;
 405 }
 406
 407 /* return the full name of the server directory (the one containing the socket) */
 408 const char *wine_get_server_dir(void)
 409 {
 410     if (!server_dir)
 411     {
 412         if (!config_dir) init_paths();
 413         else
 414         {
 415             struct stat st;
 416
 417             if (stat( config_dir, &st ) == -1)
 418             {
 419                 if (errno != ENOENT) fatal_error( "cannot stat %s\n", config_dir );
 420                 return NULL;  /* will have to try again once config_dir has been created */
 421             }
 422             init_server_dir( st.st_dev, st.st_ino );
 423         }
 424     }
 425     return server_dir;
 426 }
 427
 428 /* return the current user name */
 429 const char *wine_get_user_name(void)
 430 {
 431     if (!user_name) init_paths();
 432     return user_name;
 433 }
 434
 435 /* return the standard version string */
 436 const char *wine_get_version(void)
 437 {
 438     return PACKAGE_VERSION;
 439 }
 440
 441 /* return the build id string */
 442 const char *wine_get_build_id(void)
 443 {
 444     extern const char wine_build[];
 445     return wine_build;
 446 }
 447
 448 /* exec a binary using the preloader if requested; helper for wine_exec_wine_binary */
 449 static void preloader_exec( char **argv, int use_preloader )
 450 {
 451 #if defined(linux) && defined(__i386__)
 452     if (use_preloader)
 453     {
 454         static const char preloader[] = "wine-preloader";
 455         char *p, *full_name;
 456         char **last_arg = argv, **new_argv;
 457
 458         if (!(p = strrchr( argv[0], '/' ))) p = argv[0];
 459         else p++;
 460
 461         full_name = xmalloc( p - argv[0] + sizeof(preloader) );
 462         memcpy( full_name, argv[0], p - argv[0] );
 463         memcpy( full_name + (p - argv[0]), preloader, sizeof(preloader) );
 464
 465         /* make a copy of argv */
 466         while (*last_arg) last_arg++;
 467         new_argv = xmalloc( (last_arg - argv + 2) * sizeof(*argv) );
 468         memcpy( new_argv + 1, argv, (last_arg - argv + 1) * sizeof(*argv) );
 469         new_argv[0] = full_name;
 470         execv( full_name, new_argv );
 471         free( new_argv );
 472         free( full_name );
 473         return;
 474     }
 475 #endif
 476     execv( argv[0], argv );
 477 }
 478
 479 /* exec a wine internal binary (either the wine loader or the wine server) */
 480 void wine_exec_wine_binary( const char *name, char **argv, const char *env_var )
 481 {
 482     const char *path, *pos, *ptr;
 483     int use_preloader = 0;
 484
 485     if (!name)  /* no name means default loader */
 486     {
 487         name = argv0_name;
 488         use_preloader = 1;
 489     }
 490
 491     if ((ptr = strrchr( name, '/' )))
 492     {
 493         /* if we are in build dir and name contains a path, try that */
 494         if (build_dir)
 495         {
 496             argv[0] = build_path( build_dir, name );
 497             preloader_exec( argv, use_preloader );
 498             free( argv[0] );
 499         }
 500         name = ptr + 1;  /* get rid of path */
 501     }
 502
 503     /* first, bin directory from the current libdir or argv0 */
 504     if (bindir)
 505     {
 506         argv[0] = build_path( bindir, name );
 507         preloader_exec( argv, use_preloader );
 508         free( argv[0] );
 509     }
 510
 511     /* then specified environment variable */
 512     if (env_var)
 513     {
 514         argv[0] = (char *)env_var;
 515         preloader_exec( argv, use_preloader );
 516     }
 517
 518     /* now search in the Unix path */
 519     if ((path = getenv( "PATH" )))
 520     {
 521         argv[0] = xmalloc( strlen(path) + strlen(name) + 2 );
 522         pos = path;
 523         for (;;)
 524         {
 525             while (*pos == ':') pos++;
 526             if (!*pos) break;
 527             if (!(ptr = strchr( pos, ':' ))) ptr = pos + strlen(pos);
 528             memcpy( argv[0], pos, ptr - pos );
 529             strcpy( argv[0] + (ptr - pos), "/" );
 530             strcat( argv[0] + (ptr - pos), name );
 531             preloader_exec( argv, use_preloader );
 532             pos = ptr;
 533         }
 534         free( argv[0] );
 535     }
 536
 537     /* and finally try BINDIR */
 538     argv[0] = build_path( BINDIR, name );
 539     preloader_exec( argv, use_preloader );
 540     free( argv[0] );
 541 }