D-Bus  1.4.18
dbus-sysdeps-util-unix.c
00001 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
00002 /* dbus-sysdeps-util-unix.c Would be in dbus-sysdeps-unix.c, but not used in libdbus
00003  * 
00004  * Copyright (C) 2002, 2003, 2004, 2005  Red Hat, Inc.
00005  * Copyright (C) 2003 CodeFactory AB
00006  *
00007  * Licensed under the Academic Free License version 2.1
00008  * 
00009  * This program is free software; you can redistribute it and/or modify
00010  * it under the terms of the GNU General Public License as published by
00011  * the Free Software Foundation; either version 2 of the License, or
00012  * (at your option) any later version.
00013  *
00014  * This program is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00017  * GNU General Public License for more details.
00018  * 
00019  * You should have received a copy of the GNU General Public License
00020  * along with this program; if not, write to the Free Software
00021  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
00022  *
00023  */
00024 
00025 #include <config.h>
00026 #include "dbus-sysdeps.h"
00027 #include "dbus-sysdeps-unix.h"
00028 #include "dbus-internals.h"
00029 #include "dbus-pipe.h"
00030 #include "dbus-protocol.h"
00031 #include "dbus-string.h"
00032 #define DBUS_USERDB_INCLUDES_PRIVATE 1
00033 #include "dbus-userdb.h"
00034 #include "dbus-test.h"
00035 
00036 #include <sys/types.h>
00037 #include <stdlib.h>
00038 #include <string.h>
00039 #include <signal.h>
00040 #include <unistd.h>
00041 #include <stdio.h>
00042 #include <errno.h>
00043 #include <fcntl.h>
00044 #include <sys/stat.h>
00045 #ifdef HAVE_SYS_RESOURCE_H
00046 #include <sys/resource.h>
00047 #endif
00048 #include <grp.h>
00049 #include <sys/socket.h>
00050 #include <dirent.h>
00051 #include <sys/un.h>
00052 #include <syslog.h>
00053 
00054 #ifdef HAVE_SYS_SYSLIMITS_H
00055 #include <sys/syslimits.h>
00056 #endif
00057 
00058 #ifndef O_BINARY
00059 #define O_BINARY 0
00060 #endif
00061 
00077 dbus_bool_t
00078 _dbus_become_daemon (const DBusString *pidfile,
00079                      DBusPipe         *print_pid_pipe,
00080                      DBusError        *error,
00081                      dbus_bool_t       keep_umask)
00082 {
00083   const char *s;
00084   pid_t child_pid;
00085   int dev_null_fd;
00086 
00087   _dbus_verbose ("Becoming a daemon...\n");
00088 
00089   _dbus_verbose ("chdir to /\n");
00090   if (chdir ("/") < 0)
00091     {
00092       dbus_set_error (error, DBUS_ERROR_FAILED,
00093                       "Could not chdir() to root directory");
00094       return FALSE;
00095     }
00096 
00097   _dbus_verbose ("forking...\n");
00098   switch ((child_pid = fork ()))
00099     {
00100     case -1:
00101       _dbus_verbose ("fork failed\n");
00102       dbus_set_error (error, _dbus_error_from_errno (errno),
00103                       "Failed to fork daemon: %s", _dbus_strerror (errno));
00104       return FALSE;
00105       break;
00106 
00107     case 0:
00108       _dbus_verbose ("in child, closing std file descriptors\n");
00109 
00110       /* silently ignore failures here, if someone
00111        * doesn't have /dev/null we may as well try
00112        * to continue anyhow
00113        */
00114       
00115       dev_null_fd = open ("/dev/null", O_RDWR);
00116       if (dev_null_fd >= 0)
00117         {
00118           dup2 (dev_null_fd, 0);
00119           dup2 (dev_null_fd, 1);
00120           
00121           s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
00122           if (s == NULL || *s == '\0')
00123             dup2 (dev_null_fd, 2);
00124           else
00125             _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
00126         }
00127 
00128       if (!keep_umask)
00129         {
00130           /* Get a predictable umask */
00131           _dbus_verbose ("setting umask\n");
00132           umask (022);
00133         }
00134 
00135       _dbus_verbose ("calling setsid()\n");
00136       if (setsid () == -1)
00137         _dbus_assert_not_reached ("setsid() failed");
00138       
00139       break;
00140 
00141     default:
00142       if (!_dbus_write_pid_to_file_and_pipe (pidfile, print_pid_pipe,
00143                                              child_pid, error))
00144         {
00145           _dbus_verbose ("pid file or pipe write failed: %s\n",
00146                          error->message);
00147           kill (child_pid, SIGTERM);
00148           return FALSE;
00149         }
00150 
00151       _dbus_verbose ("parent exiting\n");
00152       _exit (0);
00153       break;
00154     }
00155   
00156   return TRUE;
00157 }
00158 
00159 
00168 static dbus_bool_t
00169 _dbus_write_pid_file (const DBusString *filename,
00170                       unsigned long     pid,
00171                       DBusError        *error)
00172 {
00173   const char *cfilename;
00174   int fd;
00175   FILE *f;
00176 
00177   cfilename = _dbus_string_get_const_data (filename);
00178   
00179   fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
00180   
00181   if (fd < 0)
00182     {
00183       dbus_set_error (error, _dbus_error_from_errno (errno),
00184                       "Failed to open \"%s\": %s", cfilename,
00185                       _dbus_strerror (errno));
00186       return FALSE;
00187     }
00188 
00189   if ((f = fdopen (fd, "w")) == NULL)
00190     {
00191       dbus_set_error (error, _dbus_error_from_errno (errno),
00192                       "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
00193       _dbus_close (fd, NULL);
00194       return FALSE;
00195     }
00196   
00197   if (fprintf (f, "%lu\n", pid) < 0)
00198     {
00199       dbus_set_error (error, _dbus_error_from_errno (errno),
00200                       "Failed to write to \"%s\": %s", cfilename,
00201                       _dbus_strerror (errno));
00202       
00203       fclose (f);
00204       return FALSE;
00205     }
00206 
00207   if (fclose (f) == EOF)
00208     {
00209       dbus_set_error (error, _dbus_error_from_errno (errno),
00210                       "Failed to close \"%s\": %s", cfilename,
00211                       _dbus_strerror (errno));
00212       return FALSE;
00213     }
00214   
00215   return TRUE;
00216 }
00217 
00229 dbus_bool_t
00230 _dbus_write_pid_to_file_and_pipe (const DBusString *pidfile,
00231                                   DBusPipe         *print_pid_pipe,
00232                                   dbus_pid_t        pid_to_write,
00233                                   DBusError        *error)
00234 {
00235   if (pidfile)
00236     {
00237       _dbus_verbose ("writing pid file %s\n", _dbus_string_get_const_data (pidfile));
00238       if (!_dbus_write_pid_file (pidfile,
00239                                  pid_to_write,
00240                                  error))
00241         {
00242           _dbus_verbose ("pid file write failed\n");
00243           _DBUS_ASSERT_ERROR_IS_SET(error);
00244           return FALSE;
00245         }
00246     }
00247   else
00248     {
00249       _dbus_verbose ("No pid file requested\n");
00250     }
00251 
00252   if (print_pid_pipe != NULL && _dbus_pipe_is_valid (print_pid_pipe))
00253     {
00254       DBusString pid;
00255       int bytes;
00256 
00257       _dbus_verbose ("writing our pid to pipe %"PRIuPTR"\n",
00258                      print_pid_pipe->fd_or_handle);
00259       
00260       if (!_dbus_string_init (&pid))
00261         {
00262           _DBUS_SET_OOM (error);
00263           return FALSE;
00264         }
00265           
00266       if (!_dbus_string_append_int (&pid, pid_to_write) ||
00267           !_dbus_string_append (&pid, "\n"))
00268         {
00269           _dbus_string_free (&pid);
00270           _DBUS_SET_OOM (error);
00271           return FALSE;
00272         }
00273           
00274       bytes = _dbus_string_get_length (&pid);
00275       if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
00276         {
00277           /* _dbus_pipe_write sets error only on failure, not short write */
00278           if (error != NULL && !dbus_error_is_set(error))
00279             {
00280               dbus_set_error (error, DBUS_ERROR_FAILED,
00281                               "Printing message bus PID: did not write enough bytes\n");
00282             }
00283           _dbus_string_free (&pid);
00284           return FALSE;
00285         }
00286           
00287       _dbus_string_free (&pid);
00288     }
00289   else
00290     {
00291       _dbus_verbose ("No pid pipe to write to\n");
00292     }
00293 
00294   return TRUE;
00295 }
00296 
00303 dbus_bool_t
00304 _dbus_verify_daemon_user (const char *user)
00305 {
00306   DBusString u;
00307 
00308   _dbus_string_init_const (&u, user);
00309 
00310   return _dbus_get_user_id_and_primary_group (&u, NULL, NULL);
00311 }
00312 
00313 
00314 /* The HAVE_LIBAUDIT case lives in selinux.c */
00315 #ifndef HAVE_LIBAUDIT
00316 
00323 dbus_bool_t
00324 _dbus_change_to_daemon_user  (const char    *user,
00325                               DBusError     *error)
00326 {
00327   dbus_uid_t uid;
00328   dbus_gid_t gid;
00329   DBusString u;
00330 
00331   _dbus_string_init_const (&u, user);
00332 
00333   if (!_dbus_get_user_id_and_primary_group (&u, &uid, &gid))
00334     {
00335       dbus_set_error (error, DBUS_ERROR_FAILED,
00336                       "User '%s' does not appear to exist?",
00337                       user);
00338       return FALSE;
00339     }
00340 
00341   /* setgroups() only works if we are a privileged process,
00342    * so we don't return error on failure; the only possible
00343    * failure is that we don't have perms to do it.
00344    *
00345    * not sure this is right, maybe if setuid()
00346    * is going to work then setgroups() should also work.
00347    */
00348   if (setgroups (0, NULL) < 0)
00349     _dbus_warn ("Failed to drop supplementary groups: %s\n",
00350                 _dbus_strerror (errno));
00351 
00352   /* Set GID first, or the setuid may remove our permission
00353    * to change the GID
00354    */
00355   if (setgid (gid) < 0)
00356     {
00357       dbus_set_error (error, _dbus_error_from_errno (errno),
00358                       "Failed to set GID to %lu: %s", gid,
00359                       _dbus_strerror (errno));
00360       return FALSE;
00361     }
00362 
00363   if (setuid (uid) < 0)
00364     {
00365       dbus_set_error (error, _dbus_error_from_errno (errno),
00366                       "Failed to set UID to %lu: %s", uid,
00367                       _dbus_strerror (errno));
00368       return FALSE;
00369     }
00370 
00371   return TRUE;
00372 }
00373 #endif /* !HAVE_LIBAUDIT */
00374 
00375 
00386 void
00387 _dbus_request_file_descriptor_limit (unsigned int limit)
00388 {
00389 #ifdef HAVE_SETRLIMIT
00390   struct rlimit lim;
00391   struct rlimit target_lim;
00392   unsigned int current_limit;
00393 
00394   /* No point to doing this practically speaking
00395    * if we're not uid 0.  We expect the system
00396    * bus to use this before we change UID, and
00397    * the session bus takes the Linux default
00398    * of 1024 for both cur and max.
00399    */
00400   if (getuid () != 0)
00401     return;
00402 
00403   if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
00404     return;
00405 
00406   if (lim.rlim_cur >= limit)
00407     return;
00408 
00409   /* Ignore "maximum limit", assume we have the "superuser"
00410    * privileges.  On Linux this is CAP_SYS_RESOURCE.
00411    */
00412   target_lim.rlim_cur = target_lim.rlim_max = limit;
00413   /* Also ignore errors; if we fail, we will at least work
00414    * up to whatever limit we had, which seems better than
00415    * just outright aborting.
00416    *
00417    * However, in the future we should probably log this so OS builders
00418    * have a chance to notice any misconfiguration like dbus-daemon
00419    * being started without CAP_SYS_RESOURCE.
00420    */
00421   setrlimit (RLIMIT_NOFILE, &target_lim);
00422 #endif
00423 }
00424 
00425 void
00426 _dbus_init_system_log (void)
00427 {
00428 #ifdef HAVE_DECL_LOG_PERROR
00429   openlog ("dbus", LOG_PID | LOG_PERROR, LOG_DAEMON);
00430 #else
00431   openlog ("dbus", LOG_PID, LOG_DAEMON);
00432 #endif
00433 }
00434 
00443 void
00444 _dbus_system_log (DBusSystemLogSeverity severity, const char *msg, ...)
00445 {
00446   va_list args;
00447 
00448   va_start (args, msg);
00449 
00450   _dbus_system_logv (severity, msg, args);
00451 
00452   va_end (args);
00453 }
00454 
00465 void
00466 _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args)
00467 {
00468   int flags;
00469   switch (severity)
00470     {
00471       case DBUS_SYSTEM_LOG_INFO:
00472         flags =  LOG_DAEMON | LOG_NOTICE;
00473         break;
00474       case DBUS_SYSTEM_LOG_SECURITY:
00475         flags = LOG_AUTH | LOG_NOTICE;
00476         break;
00477       case DBUS_SYSTEM_LOG_FATAL:
00478         flags = LOG_DAEMON|LOG_CRIT;
00479         break;
00480       default:
00481         return;
00482     }
00483 
00484 #ifndef HAVE_DECL_LOG_PERROR
00485     {
00486       /* vsyslog() won't write to stderr, so we'd better do it */
00487       va_list tmp;
00488 
00489       DBUS_VA_COPY (tmp, args);
00490       fprintf (stderr, "dbus[" DBUS_PID_FORMAT "]: ", _dbus_getpid ());
00491       vfprintf (stderr, msg, tmp);
00492       fputc ('\n', stderr);
00493       va_end (tmp);
00494     }
00495 #endif
00496 
00497   vsyslog (flags, msg, args);
00498 
00499   if (severity == DBUS_SYSTEM_LOG_FATAL)
00500     exit (1);
00501 }
00502 
00508 void
00509 _dbus_set_signal_handler (int               sig,
00510                           DBusSignalHandler handler)
00511 {
00512   struct sigaction act;
00513   sigset_t empty_mask;
00514   
00515   sigemptyset (&empty_mask);
00516   act.sa_handler = handler;
00517   act.sa_mask    = empty_mask;
00518   act.sa_flags   = 0;
00519   sigaction (sig,  &act, NULL);
00520 }
00521 
00527 dbus_bool_t 
00528 _dbus_file_exists (const char *file)
00529 {
00530   return (access (file, F_OK) == 0);
00531 }
00532 
00539 dbus_bool_t 
00540 _dbus_user_at_console (const char *username,
00541                        DBusError  *error)
00542 {
00543 
00544   DBusString f;
00545   dbus_bool_t result;
00546 
00547   result = FALSE;
00548   if (!_dbus_string_init (&f))
00549     {
00550       _DBUS_SET_OOM (error);
00551       return FALSE;
00552     }
00553 
00554   if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR))
00555     {
00556       _DBUS_SET_OOM (error);
00557       goto out;
00558     }
00559 
00560 
00561   if (!_dbus_string_append (&f, username))
00562     {
00563       _DBUS_SET_OOM (error);
00564       goto out;
00565     }
00566 
00567   result = _dbus_file_exists (_dbus_string_get_const_data (&f));
00568 
00569  out:
00570   _dbus_string_free (&f);
00571 
00572   return result;
00573 }
00574 
00575 
00582 dbus_bool_t
00583 _dbus_path_is_absolute (const DBusString *filename)
00584 {
00585   if (_dbus_string_get_length (filename) > 0)
00586     return _dbus_string_get_byte (filename, 0) == '/';
00587   else
00588     return FALSE;
00589 }
00590 
00599 dbus_bool_t
00600 _dbus_stat (const DBusString *filename,
00601             DBusStat         *statbuf,
00602             DBusError        *error)
00603 {
00604   const char *filename_c;
00605   struct stat sb;
00606 
00607   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00608   
00609   filename_c = _dbus_string_get_const_data (filename);
00610 
00611   if (stat (filename_c, &sb) < 0)
00612     {
00613       dbus_set_error (error, _dbus_error_from_errno (errno),
00614                       "%s", _dbus_strerror (errno));
00615       return FALSE;
00616     }
00617 
00618   statbuf->mode = sb.st_mode;
00619   statbuf->nlink = sb.st_nlink;
00620   statbuf->uid = sb.st_uid;
00621   statbuf->gid = sb.st_gid;
00622   statbuf->size = sb.st_size;
00623   statbuf->atime = sb.st_atime;
00624   statbuf->mtime = sb.st_mtime;
00625   statbuf->ctime = sb.st_ctime;
00626 
00627   return TRUE;
00628 }
00629 
00630 
00634 struct DBusDirIter
00635 {
00636   DIR *d; 
00638 };
00639 
00647 DBusDirIter*
00648 _dbus_directory_open (const DBusString *filename,
00649                       DBusError        *error)
00650 {
00651   DIR *d;
00652   DBusDirIter *iter;
00653   const char *filename_c;
00654 
00655   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00656   
00657   filename_c = _dbus_string_get_const_data (filename);
00658 
00659   d = opendir (filename_c);
00660   if (d == NULL)
00661     {
00662       dbus_set_error (error, _dbus_error_from_errno (errno),
00663                       "Failed to read directory \"%s\": %s",
00664                       filename_c,
00665                       _dbus_strerror (errno));
00666       return NULL;
00667     }
00668   iter = dbus_new0 (DBusDirIter, 1);
00669   if (iter == NULL)
00670     {
00671       closedir (d);
00672       dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
00673                       "Could not allocate memory for directory iterator");
00674       return NULL;
00675     }
00676 
00677   iter->d = d;
00678 
00679   return iter;
00680 }
00681 
00695 dbus_bool_t
00696 _dbus_directory_get_next_file (DBusDirIter      *iter,
00697                                DBusString       *filename,
00698                                DBusError        *error)
00699 {
00700   struct dirent *ent;
00701   int err;
00702 
00703   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00704 
00705  again:
00706   errno = 0;
00707   ent = readdir (iter->d);
00708 
00709   if (!ent)
00710     {
00711       err = errno;
00712 
00713       if (err != 0)
00714         dbus_set_error (error,
00715                         _dbus_error_from_errno (err),
00716                         "%s", _dbus_strerror (err));
00717 
00718       return FALSE;
00719     }
00720   else if (ent->d_name[0] == '.' &&
00721            (ent->d_name[1] == '\0' ||
00722             (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
00723     goto again;
00724   else
00725     {
00726       _dbus_string_set_length (filename, 0);
00727       if (!_dbus_string_append (filename, ent->d_name))
00728         {
00729           dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
00730                           "No memory to read directory entry");
00731           return FALSE;
00732         }
00733       else
00734         {
00735           return TRUE;
00736         }
00737     }
00738 }
00739 
00743 void
00744 _dbus_directory_close (DBusDirIter *iter)
00745 {
00746   closedir (iter->d);
00747   dbus_free (iter);
00748 }
00749 
00750 static dbus_bool_t
00751 fill_user_info_from_group (struct group  *g,
00752                            DBusGroupInfo *info,
00753                            DBusError     *error)
00754 {
00755   _dbus_assert (g->gr_name != NULL);
00756   
00757   info->gid = g->gr_gid;
00758   info->groupname = _dbus_strdup (g->gr_name);
00759 
00760   /* info->members = dbus_strdupv (g->gr_mem) */
00761   
00762   if (info->groupname == NULL)
00763     {
00764       dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00765       return FALSE;
00766     }
00767 
00768   return TRUE;
00769 }
00770 
00771 static dbus_bool_t
00772 fill_group_info (DBusGroupInfo    *info,
00773                  dbus_gid_t        gid,
00774                  const DBusString *groupname,
00775                  DBusError        *error)
00776 {
00777   const char *group_c_str;
00778 
00779   _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
00780   _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
00781 
00782   if (groupname)
00783     group_c_str = _dbus_string_get_const_data (groupname);
00784   else
00785     group_c_str = NULL;
00786   
00787   /* For now assuming that the getgrnam() and getgrgid() flavors
00788    * always correspond to the pwnam flavors, if not we have
00789    * to add more configure checks.
00790    */
00791   
00792 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
00793   {
00794     struct group *g;
00795     int result;
00796     size_t buflen;
00797     char *buf;
00798     struct group g_str;
00799     dbus_bool_t b;
00800 
00801     /* retrieve maximum needed size for buf */
00802     buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
00803 
00804     /* sysconf actually returns a long, but everything else expects size_t,
00805      * so just recast here.
00806      * https://bugs.freedesktop.org/show_bug.cgi?id=17061
00807      */
00808     if ((long) buflen <= 0)
00809       buflen = 1024;
00810 
00811     result = -1;
00812     while (1)
00813       {
00814         buf = dbus_malloc (buflen);
00815         if (buf == NULL)
00816           {
00817             dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00818             return FALSE;
00819           }
00820 
00821         g = NULL;
00822 #ifdef HAVE_POSIX_GETPWNAM_R
00823         if (group_c_str)
00824           result = getgrnam_r (group_c_str, &g_str, buf, buflen,
00825                                &g);
00826         else
00827           result = getgrgid_r (gid, &g_str, buf, buflen,
00828                                &g);
00829 #else
00830         g = getgrnam_r (group_c_str, &g_str, buf, buflen);
00831         result = 0;
00832 #endif /* !HAVE_POSIX_GETPWNAM_R */
00833         /* Try a bigger buffer if ERANGE was returned:
00834            https://bugs.freedesktop.org/show_bug.cgi?id=16727
00835         */
00836         if (result == ERANGE && buflen < 512 * 1024)
00837           {
00838             dbus_free (buf);
00839             buflen *= 2;
00840           }
00841         else
00842           {
00843             break;
00844           }
00845       }
00846 
00847     if (result == 0 && g == &g_str)
00848       {
00849         b = fill_user_info_from_group (g, info, error);
00850         dbus_free (buf);
00851         return b;
00852       }
00853     else
00854       {
00855         dbus_set_error (error, _dbus_error_from_errno (errno),
00856                         "Group %s unknown or failed to look it up\n",
00857                         group_c_str ? group_c_str : "???");
00858         dbus_free (buf);
00859         return FALSE;
00860       }
00861   }
00862 #else /* ! HAVE_GETPWNAM_R */
00863   {
00864     /* I guess we're screwed on thread safety here */
00865     struct group *g;
00866 
00867     g = getgrnam (group_c_str);
00868 
00869     if (g != NULL)
00870       {
00871         return fill_user_info_from_group (g, info, error);
00872       }
00873     else
00874       {
00875         dbus_set_error (error, _dbus_error_from_errno (errno),
00876                         "Group %s unknown or failed to look it up\n",
00877                         group_c_str ? group_c_str : "???");
00878         return FALSE;
00879       }
00880   }
00881 #endif  /* ! HAVE_GETPWNAM_R */
00882 }
00883 
00893 dbus_bool_t
00894 _dbus_group_info_fill (DBusGroupInfo    *info,
00895                        const DBusString *groupname,
00896                        DBusError        *error)
00897 {
00898   return fill_group_info (info, DBUS_GID_UNSET,
00899                           groupname, error);
00900 
00901 }
00902 
00912 dbus_bool_t
00913 _dbus_group_info_fill_gid (DBusGroupInfo *info,
00914                            dbus_gid_t     gid,
00915                            DBusError     *error)
00916 {
00917   return fill_group_info (info, gid, NULL, error);
00918 }
00919 
00928 dbus_bool_t
00929 _dbus_parse_unix_user_from_config (const DBusString  *username,
00930                                    dbus_uid_t        *uid_p)
00931 {
00932   return _dbus_get_user_id (username, uid_p);
00933 
00934 }
00935 
00944 dbus_bool_t
00945 _dbus_parse_unix_group_from_config (const DBusString  *groupname,
00946                                     dbus_gid_t        *gid_p)
00947 {
00948   return _dbus_get_group_id (groupname, gid_p);
00949 }
00950 
00961 dbus_bool_t
00962 _dbus_unix_groups_from_uid (dbus_uid_t            uid,
00963                             dbus_gid_t          **group_ids,
00964                             int                  *n_group_ids)
00965 {
00966   return _dbus_groups_from_uid (uid, group_ids, n_group_ids);
00967 }
00968 
00978 dbus_bool_t
00979 _dbus_unix_user_is_at_console (dbus_uid_t         uid,
00980                                DBusError         *error)
00981 {
00982   return _dbus_is_console_user (uid, error);
00983 
00984 }
00985 
00993 dbus_bool_t
00994 _dbus_unix_user_is_process_owner (dbus_uid_t uid)
00995 {
00996   return uid == _dbus_geteuid ();
00997 }
00998 
01006 dbus_bool_t
01007 _dbus_windows_user_is_process_owner (const char *windows_sid)
01008 {
01009   return FALSE;
01010 }
01011  /* End of DBusInternalsUtils functions */
01013 
01025 dbus_bool_t
01026 _dbus_string_get_dirname  (const DBusString *filename,
01027                            DBusString       *dirname)
01028 {
01029   int sep;
01030   
01031   _dbus_assert (filename != dirname);
01032   _dbus_assert (filename != NULL);
01033   _dbus_assert (dirname != NULL);
01034 
01035   /* Ignore any separators on the end */
01036   sep = _dbus_string_get_length (filename);
01037   if (sep == 0)
01038     return _dbus_string_append (dirname, "."); /* empty string passed in */
01039     
01040   while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
01041     --sep;
01042 
01043   _dbus_assert (sep >= 0);
01044   
01045   if (sep == 0)
01046     return _dbus_string_append (dirname, "/");
01047   
01048   /* Now find the previous separator */
01049   _dbus_string_find_byte_backward (filename, sep, '/', &sep);
01050   if (sep < 0)
01051     return _dbus_string_append (dirname, ".");
01052   
01053   /* skip multiple separators */
01054   while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
01055     --sep;
01056 
01057   _dbus_assert (sep >= 0);
01058   
01059   if (sep == 0 &&
01060       _dbus_string_get_byte (filename, 0) == '/')
01061     return _dbus_string_append (dirname, "/");
01062   else
01063     return _dbus_string_copy_len (filename, 0, sep - 0,
01064                                   dirname, _dbus_string_get_length (dirname));
01065 } /* DBusString stuff */
01067 
01068 static void
01069 string_squash_nonprintable (DBusString *str)
01070 {
01071   unsigned char *buf;
01072   int i, len; 
01073   
01074   buf = _dbus_string_get_data (str);
01075   len = _dbus_string_get_length (str);
01076   
01077   for (i = 0; i < len; i++)
01078     {
01079       unsigned char c = (unsigned char) buf[i];
01080       if (c == '\0')
01081         buf[i] = ' ';
01082       else if (c < 0x20 || c > 127)
01083         buf[i] = '?';
01084     }
01085 }
01086 
01101 dbus_bool_t 
01102 _dbus_command_for_pid (unsigned long  pid,
01103                        DBusString    *str,
01104                        int            max_len,
01105                        DBusError     *error)
01106 {
01107   /* This is all Linux-specific for now */
01108   DBusString path;
01109   DBusString cmdline;
01110   int fd;
01111   
01112   if (!_dbus_string_init (&path)) 
01113     {
01114       _DBUS_SET_OOM (error);
01115       return FALSE;
01116     }
01117   
01118   if (!_dbus_string_init (&cmdline))
01119     {
01120       _DBUS_SET_OOM (error);
01121       _dbus_string_free (&path);
01122       return FALSE;
01123     }
01124   
01125   if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid))
01126     goto oom;
01127   
01128   fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
01129   if (fd < 0) 
01130     {
01131       dbus_set_error (error,
01132                       _dbus_error_from_errno (errno),
01133                       "Failed to open \"%s\": %s",
01134                       _dbus_string_get_const_data (&path),
01135                       _dbus_strerror (errno));
01136       goto fail;
01137     }
01138   
01139   if (!_dbus_read (fd, &cmdline, max_len))
01140     {
01141       dbus_set_error (error,
01142                       _dbus_error_from_errno (errno),
01143                       "Failed to read from \"%s\": %s",
01144                       _dbus_string_get_const_data (&path),
01145                       _dbus_strerror (errno));      
01146       goto fail;
01147     }
01148   
01149   if (!_dbus_close (fd, error))
01150     goto fail;
01151   
01152   string_squash_nonprintable (&cmdline);  
01153 
01154   if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str)))
01155     goto oom;
01156 
01157   _dbus_string_free (&cmdline);  
01158   _dbus_string_free (&path);
01159   return TRUE;
01160 oom:
01161   _DBUS_SET_OOM (error);
01162 fail:
01163   _dbus_string_free (&cmdline);
01164   _dbus_string_free (&path);
01165   return FALSE;
01166 }