library/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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 <sys/stat.h>
  29 #ifdef HAVE_UNISTD_H
  30 # include <unistd.h>
  31 #endif
  32 #ifdef HAVE_PWD_H
  33 #include <pwd.h>
  34 #endif
  35
  36 static const char * const server_config_dir = "/.wine";        /* config dir relative to $HOME */
  37 static const char * const server_root_prefix = "/tmp/.wine-";  /* prefix for server root dir */
  38 static const char * const server_dir_prefix = "/server-";      /* prefix for server dir */
  39
  40 static char *config_dir;
  41 static char *server_dir;
  42 static char *user_name;
  43
  44 #ifdef __GNUC__
  45 static void fatal_error( const char *err, ... )  __attribute__((noreturn,format(printf,1,2)));
  46 static void fatal_perror( const char *err, ... )  __attribute__((noreturn,format(printf,1,2)));
  47 #endif
  48
  49 /* die on a fatal error */
  50 static void fatal_error( const char *err, ... )
  51 {
  52     va_list args;
  53
  54     va_start( args, err );
  55     fprintf( stderr, "wine: " );
  56     vfprintf( stderr, err, args );
  57     va_end( args );
  58     exit(1);
  59 }
  60
  61 /* die on a fatal error */
  62 static void fatal_perror( const char *err, ... )
  63 {
  64     va_list args;
  65
  66     va_start( args, err );
  67     fprintf( stderr, "wine: " );
  68     vfprintf( stderr, err, args );
  69     perror( " " );
  70     va_end( args );
  71     exit(1);
  72 }
  73
  74 /* malloc wrapper */
  75 static void *xmalloc( size_t size )
  76 {
  77     void *res;
  78
  79     if (!size) size = 1;
  80     if (!(res = malloc( size ))) fatal_error( "virtual memory exhausted\n");
  81     return res;
  82 }
  83
  84 /* strdup wrapper */
  85 static char *xstrdup( const char *str )
  86 {
  87     size_t len = strlen(str) + 1;
  88     char *res = xmalloc( len );
  89     memcpy( res, str, len );
  90     return res;
  91 }
  92
  93 /* remove all trailing slashes from a path name */
  94 inline static void remove_trailing_slashes( char *path )
  95 {
  96     int len = strlen( path );
  97     while (len > 1 && path[len-1] == '/') path[--len] = 0;
  98 }
  99
 100 /* initialize all the paths values */
 101 static void init_paths(void)
 102 {
 103     struct stat st;
 104     char *p;
 105
 106     const char *home = getenv( "HOME" );
 107     const char *user = NULL;
 108     const char *prefix = getenv( "WINEPREFIX" );
 109
 110 #ifdef HAVE_GETPWUID
 111     char uid_str[32];
 112     struct passwd *pwd = getpwuid( getuid() );
 113
 114     if (pwd)
 115     {
 116         user = pwd->pw_name;
 117         if (!home) home = pwd->pw_dir;
 118     }
 119     if (!user)
 120     {
 121         sprintf( uid_str, "%d", getuid() );
 122         user = uid_str;
 123     }
 124 #else  /* HAVE_GETPWUID */
 125     if (!(user = getenv( "USER" )))
 126         fatal_error( "cannot determine your user name, set the USER environment variable\n" );
 127 #endif  /* HAVE_GETPWUID */
 128     user_name = xstrdup( user );
 129
 130     /* build config_dir */
 131
 132     if (prefix)
 133     {
 134         if (!(config_dir = strdup( prefix ))) fatal_error( "virtual memory exhausted\n");
 135         remove_trailing_slashes( config_dir );
 136         if (config_dir[0] != '/')
 137             fatal_error( "invalid directory %s in WINEPREFIX: not an absolute path\n", prefix );
 138         if (stat( config_dir, &st ) == -1)
 139             fatal_perror( "cannot open %s as specified in WINEPREFIX", config_dir );
 140     }
 141     else
 142     {
 143         if (!home) fatal_error( "could not determine your home directory\n" );
 144         if (home[0] != '/') fatal_error( "your home directory %s is not an absolute path\n", home );
 145         config_dir = xmalloc( strlen(home) + strlen(server_config_dir) + 1 );
 146         strcpy( config_dir, home );
 147         remove_trailing_slashes( config_dir );
 148         strcat( config_dir, server_config_dir );
 149         if (stat( config_dir, &st ) == -1)
 150             fatal_perror( "cannot open %s", config_dir );
 151     }
 152     if (!S_ISDIR(st.st_mode)) fatal_error( "%s is not a directory\n", config_dir );
 153
 154     /* build server_dir */
 155
 156     server_dir = xmalloc( strlen(server_root_prefix) + strlen(user) + strlen( server_dir_prefix ) +
 157                           2*sizeof(st.st_dev) + 2*sizeof(st.st_ino) + 2 );
 158     strcpy( server_dir, server_root_prefix );
 159     p = server_dir + strlen(server_dir);
 160     strcpy( p, user );
 161     while (*p)
 162     {
 163         if (*p == '/') *p = '!';
 164         p++;
 165     }
 166     strcpy( p, server_dir_prefix );
 167
 168     if (sizeof(st.st_dev) > sizeof(unsigned long) && st.st_dev > ~0UL)
 169         sprintf( server_dir + strlen(server_dir), "%lx%08lx-",
 170                  (unsigned long)(st.st_dev >> 32), (unsigned long)st.st_dev );
 171     else
 172         sprintf( server_dir + strlen(server_dir), "%lx-", (unsigned long)st.st_dev );
 173
 174     if (sizeof(st.st_ino) > sizeof(unsigned long) && st.st_ino > ~0UL)
 175         sprintf( server_dir + strlen(server_dir), "%lx%08lx",
 176                  (unsigned long)(st.st_ino >> 32), (unsigned long)st.st_ino );
 177     else
 178         sprintf( server_dir + strlen(server_dir), "%lx", (unsigned long)st.st_ino );
 179 }
 180
 181 /* return the configuration directory ($WINEPREFIX or $HOME/.wine) */
 182 const char *wine_get_config_dir(void)
 183 {
 184     if (!config_dir) init_paths();
 185     return config_dir;
 186 }
 187
 188 /* return the full name of the server directory (the one containing the socket) */
 189 const char *wine_get_server_dir(void)
 190 {
 191     if (!server_dir) init_paths();
 192     return server_dir;
 193 }
 194
 195 /* return the current user name */
 196 const char *wine_get_user_name(void)
 197 {
 198     if (!user_name) init_paths();
 199     return user_name;
 200 }