2006-08-29 Havoc Pennington <hp@redhat.com>

	* dbus/dbus-sysdeps-util.c, dbus/dbus-sysdeps-util-unix.c: change
	from Ralf Habacker to move UNIX-specific sysdeps into a separate file.

4 files changed, 747 insertions, 714 deletions

diff --git a/ChangeLog b/ChangeLog
index 4cf48b71..203584c9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2006-08-29  Havoc Pennington  <hp@redhat.com>
+
+	* dbus/dbus-sysdeps-util.c, dbus/dbus-sysdeps-util-unix.c: change
+	from Ralf Habacker to move UNIX-specific sysdeps into a separate file.
+
 2006-08-25  John (J5) Palmieri  <johnp@redhat.com>
 
 	* test/Makefile.am: change find to use syntax that works with non
diff --git a/dbus/Makefile.am b/dbus/Makefile.am
index c3aab810..2fdcf385 100644
--- a/dbus/Makefile.am
+++ b/dbus/Makefile.am
@@ -129,6 +129,7 @@ DBUS_UTIL_SOURCES=				\
 	dbus-spawn.h				\
 	dbus-string-util.c			\
 	dbus-sysdeps-util.c			\
+	dbus-sysdeps-util-unix.c		\
 	dbus-test.c				\
 	dbus-test.h				\
 	dbus-userdb-util.c
diff --git a/dbus/dbus-sysdeps-util-unix.c b/dbus/dbus-sysdeps-util-unix.c
new file mode 100644
index 00000000..404be44b
--- /dev/null
+++ b/dbus/dbus-sysdeps-util-unix.c
@@ -0,0 +1,740 @@
+/* -*- mode: C; c-file-style: "gnu" -*- */
+/* dbus-sysdeps-util-unix.c Would be in dbus-sysdeps-unix.c, but not used in libdbus
+ * 
+ * Copyright (C) 2002, 2003, 2004, 2005  Red Hat, Inc.
+ * Copyright (C) 2003 CodeFactory AB
+ *
+ * Licensed under the Academic Free License version 2.1
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+#include "dbus-sysdeps.h"
+#include "dbus-internals.h"
+#include "dbus-protocol.h"
+#include "dbus-string.h"
+#define DBUS_USERDB_INCLUDES_PRIVATE 1
+#include "dbus-userdb.h"
+#include "dbus-test.h"
+
+#include <sys/types.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <grp.h>
+#include <sys/socket.h>
+#include <dirent.h>
+#include <sys/un.h>
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+/**
+ * @addtogroup DBusInternalsUtils
+ * @{
+ */
+
+/**
+ * Does the chdir, fork, setsid, etc. to become a daemon process.
+ *
+ * @param pidfile #NULL, or pidfile to create
+ * @param print_pid_fd file descriptor to print daemon's pid to, or -1 for none
+ * @param error return location for errors
+ * @returns #FALSE on failure
+ */
+dbus_bool_t
+_dbus_become_daemon (const DBusString *pidfile,
+		     int               print_pid_fd,
+                     DBusError        *error)
+{
+  const char *s;
+  pid_t child_pid;
+  int dev_null_fd;
+
+  _dbus_verbose ("Becoming a daemon...\n");
+
+  _dbus_verbose ("chdir to /\n");
+  if (chdir ("/") < 0)
+    {
+      dbus_set_error (error, DBUS_ERROR_FAILED,
+                      "Could not chdir() to root directory");
+      return FALSE;
+    }
+
+  _dbus_verbose ("forking...\n");
+  switch ((child_pid = fork ()))
+    {
+    case -1:
+      _dbus_verbose ("fork failed\n");
+      dbus_set_error (error, _dbus_error_from_errno (errno),
+                      "Failed to fork daemon: %s", _dbus_strerror (errno));
+      return FALSE;
+      break;
+
+    case 0:
+      _dbus_verbose ("in child, closing std file descriptors\n");
+
+      /* silently ignore failures here, if someone
+       * doesn't have /dev/null we may as well try
+       * to continue anyhow
+       */
+      
+      dev_null_fd = open ("/dev/null", O_RDWR);
+      if (dev_null_fd >= 0)
+        {
+          dup2 (dev_null_fd, 0);
+          dup2 (dev_null_fd, 1);
+          
+          s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
+          if (s == NULL || *s == '\0')
+            dup2 (dev_null_fd, 2);
+          else
+            _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
+        }
+
+      /* Get a predictable umask */
+      _dbus_verbose ("setting umask\n");
+      umask (022);
+      break;
+
+    default:
+      if (pidfile)
+        {
+          _dbus_verbose ("parent writing pid file\n");
+          if (!_dbus_write_pid_file (pidfile,
+                                     child_pid,
+                                     error))
+            {
+              _dbus_verbose ("pid file write failed, killing child\n");
+              kill (child_pid, SIGTERM);
+              return FALSE;
+            }
+        }
+
+      /* Write PID if requested */
+      if (print_pid_fd >= 0)
+	{
+	  DBusString pid;
+	  int bytes;
+	  
+	  if (!_dbus_string_init (&pid))
+	    {
+	      _DBUS_SET_OOM (error);
+              kill (child_pid, SIGTERM);
+	      return FALSE;
+	    }
+	  
+	  if (!_dbus_string_append_int (&pid, child_pid) ||
+	      !_dbus_string_append (&pid, "\n"))
+	    {
+	      _dbus_string_free (&pid);
+	      _DBUS_SET_OOM (error);
+              kill (child_pid, SIGTERM);
+	      return FALSE;
+	    }
+	  
+	  bytes = _dbus_string_get_length (&pid);
+	  if (_dbus_write (print_pid_fd, &pid, 0, bytes) != bytes)
+	    {
+	      dbus_set_error (error, DBUS_ERROR_FAILED,
+			      "Printing message bus PID: %s\n",
+			      _dbus_strerror (errno));
+	      _dbus_string_free (&pid);
+              kill (child_pid, SIGTERM);
+	      return FALSE;
+	    }
+	  
+	  _dbus_string_free (&pid);
+	}
+      _dbus_verbose ("parent exiting\n");
+      _exit (0);
+      break;
+    }
+
+  _dbus_verbose ("calling setsid()\n");
+  if (setsid () == -1)
+    _dbus_assert_not_reached ("setsid() failed");
+  
+  return TRUE;
+}
+
+
+/**
+ * Creates a file containing the process ID.
+ *
+ * @param filename the filename to write to
+ * @param pid our process ID
+ * @param error return location for errors
+ * @returns #FALSE on failure
+ */
+dbus_bool_t
+_dbus_write_pid_file (const DBusString *filename,
+                      unsigned long     pid,
+		      DBusError        *error)
+{
+  const char *cfilename;
+  int fd;
+  FILE *f;
+
+  cfilename = _dbus_string_get_const_data (filename);
+  
+  fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
+  
+  if (fd < 0)
+    {
+      dbus_set_error (error, _dbus_error_from_errno (errno),
+                      "Failed to open \"%s\": %s", cfilename,
+                      _dbus_strerror (errno));
+      return FALSE;
+    }
+
+  if ((f = fdopen (fd, "w")) == NULL)
+    {
+      dbus_set_error (error, _dbus_error_from_errno (errno),
+                      "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
+      close (fd);
+      return FALSE;
+    }
+  
+  if (fprintf (f, "%lu\n", pid) < 0)
+    {
+      dbus_set_error (error, _dbus_error_from_errno (errno),
+                      "Failed to write to \"%s\": %s", cfilename,
+                      _dbus_strerror (errno));
+      
+      fclose (f);
+      return FALSE;
+    }
+
+  if (fclose (f) == EOF)
+    {
+      dbus_set_error (error, _dbus_error_from_errno (errno),
+                      "Failed to close \"%s\": %s", cfilename,
+                      _dbus_strerror (errno));
+      return FALSE;
+    }
+  
+  return TRUE;
+}
+
+
+/**
+ * Changes the user and group the bus is running as.
+ *
+ * @param uid the new user ID
+ * @param gid the new group ID
+ * @param error return location for errors
+ * @returns #FALSE on failure
+ */
+dbus_bool_t
+_dbus_change_identity  (dbus_uid_t     uid,
+                        dbus_gid_t     gid,
+                        DBusError     *error)
+{
+  /* setgroups() only works if we are a privileged process,
+   * so we don't return error on failure; the only possible
+   * failure is that we don't have perms to do it.
+   * FIXME not sure this is right, maybe if setuid()
+   * is going to work then setgroups() should also work.
+   */
+  if (setgroups (0, NULL) < 0)
+    _dbus_warn ("Failed to drop supplementary groups: %s\n",
+                _dbus_strerror (errno));
+  
+  /* Set GID first, or the setuid may remove our permission
+   * to change the GID
+   */
+  if (setgid (gid) < 0)
+    {
+      dbus_set_error (error, _dbus_error_from_errno (errno),
+                      "Failed to set GID to %lu: %s", gid,
+                      _dbus_strerror (errno));
+      return FALSE;
+    }
+  
+  if (setuid (uid) < 0)
+    {
+      dbus_set_error (error, _dbus_error_from_errno (errno),
+                      "Failed to set UID to %lu: %s", uid,
+                      _dbus_strerror (errno));
+      return FALSE;
+    }
+  
+  return TRUE;
+}
+
+/** Installs a UNIX signal handler
+ *
+ * @param sig the signal to handle
+ * @param handler the handler
+ */
+void
+_dbus_set_signal_handler (int               sig,
+                          DBusSignalHandler handler)
+{
+  struct sigaction act;
+  sigset_t empty_mask;
+  
+  sigemptyset (&empty_mask);
+  act.sa_handler = handler;
+  act.sa_mask    = empty_mask;
+  act.sa_flags   = 0;
+  sigaction (sig,  &act, NULL);
+}
+
+
+/**
+ * Removes a directory; Directory must be empty
+ * 
+ * @param filename directory filename
+ * @param error initialized error object
+ * @returns #TRUE on success
+ */
+dbus_bool_t
+_dbus_delete_directory (const DBusString *filename,
+			DBusError        *error)
+{
+  const char *filename_c;
+  
+  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+
+  filename_c = _dbus_string_get_const_data (filename);
+
+  if (rmdir (filename_c) != 0)
+    {
+      dbus_set_error (error, DBUS_ERROR_FAILED,
+		      "Failed to remove directory %s: %s\n",
+		      filename_c, _dbus_strerror (errno));
+      return FALSE;
+    }
+  
+  return TRUE;
+}
+
+/** Checks if a file exists
+*
+* @param file full path to the file
+* @returns #TRUE if file exists
+*/
+dbus_bool_t 
+_dbus_file_exists (const char *file)
+{
+  return (access (file, F_OK) == 0);
+}
+
+/** Checks if user is at the console
+*
+* @param username user to check
+* @param error return location for errors
+* @returns #TRUE is the user is at the consolei and there are no errors
+*/
+dbus_bool_t 
+_dbus_user_at_console (const char *username,
+                       DBusError  *error)
+{
+
+  DBusString f;
+  dbus_bool_t result;
+
+  result = FALSE;
+  if (!_dbus_string_init (&f))
+    {
+      _DBUS_SET_OOM (error);
+      return FALSE;
+    }
+
+  if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR))
+    {
+      _DBUS_SET_OOM (error);
+      goto out;
+    }
+
+
+  if (!_dbus_string_append (&f, username))
+    {
+      _DBUS_SET_OOM (error);
+      goto out;
+    }
+
+  result = _dbus_file_exists (_dbus_string_get_const_data (&f));
+
+ out:
+  _dbus_string_free (&f);
+
+  return result;
+}
+
+
+/**
+ * Checks whether the filename is an absolute path
+ *
+ * @param filename the filename
+ * @returns #TRUE if an absolute path
+ */
+dbus_bool_t
+_dbus_path_is_absolute (const DBusString *filename)
+{
+  if (_dbus_string_get_length (filename) > 0)
+    return _dbus_string_get_byte (filename, 0) == '/';
+  else
+    return FALSE;
+}
+
+/**
+ * stat() wrapper.
+ *
+ * @param filename the filename to stat
+ * @param statbuf the stat info to fill in
+ * @param error return location for error
+ * @returns #FALSE if error was set
+ */
+dbus_bool_t
+_dbus_stat (const DBusString *filename,
+            DBusStat         *statbuf,
+            DBusError        *error)
+{
+  const char *filename_c;
+  struct stat sb;
+
+  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+  
+  filename_c = _dbus_string_get_const_data (filename);
+
+  if (stat (filename_c, &sb) < 0)
+    {
+      dbus_set_error (error, _dbus_error_from_errno (errno),
+                      "%s", _dbus_strerror (errno));
+      return FALSE;
+    }
+
+  statbuf->mode = sb.st_mode;
+  statbuf->nlink = sb.st_nlink;
+  statbuf->uid = sb.st_uid;
+  statbuf->gid = sb.st_gid;
+  statbuf->size = sb.st_size;
+  statbuf->atime = sb.st_atime;
+  statbuf->mtime = sb.st_mtime;
+  statbuf->ctime = sb.st_ctime;
+
+  return TRUE;
+}
+
+
+/**
+ * Internals of directory iterator
+ */
+struct DBusDirIter
+{
+  DIR *d; /**< The DIR* from opendir() */
+  
+};
+
+/**
+ * Open a directory to iterate over.
+ *
+ * @param filename the directory name
+ * @param error exception return object or #NULL
+ * @returns new iterator, or #NULL on error
+ */
+DBusDirIter*
+_dbus_directory_open (const DBusString *filename,
+                      DBusError        *error)
+{
+  DIR *d;
+  DBusDirIter *iter;
+  const char *filename_c;
+
+  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+  
+  filename_c = _dbus_string_get_const_data (filename);
+
+  d = opendir (filename_c);
+  if (d == NULL)
+    {
+      dbus_set_error (error, _dbus_error_from_errno (errno),
+                      "Failed to read directory \"%s\": %s",
+                      filename_c,
+                      _dbus_strerror (errno));
+      return NULL;
+    }
+  iter = dbus_new0 (DBusDirIter, 1);
+  if (iter == NULL)
+    {
+      closedir (d);
+      dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
+                      "Could not allocate memory for directory iterator");
+      return NULL;
+    }
+
+  iter->d = d;
+
+  return iter;
+}
+
+/**
+ * Get next file in the directory. Will not return "." or ".."  on
+ * UNIX. If an error occurs, the contents of "filename" are
+ * undefined. The error is never set if the function succeeds.
+ *
+ * @todo for thread safety, I think we have to use
+ * readdir_r(). (GLib has the same issue, should file a bug.)
+ *
+ * @param iter the iterator
+ * @param filename string to be set to the next file in the dir
+ * @param error return location for error
+ * @returns #TRUE if filename was filled in with a new filename
+ */
+dbus_bool_t
+_dbus_directory_get_next_file (DBusDirIter      *iter,
+                               DBusString       *filename,
+                               DBusError        *error)
+{
+  struct dirent *ent;
+
+  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
+  
+ again:
+  errno = 0;
+  ent = readdir (iter->d);
+  if (ent == NULL)
+    {
+      if (errno != 0)
+        dbus_set_error (error,
+                        _dbus_error_from_errno (errno),
+                        "%s", _dbus_strerror (errno));
+      return FALSE;
+    }
+  else if (ent->d_name[0] == '.' &&
+           (ent->d_name[1] == '\0' ||
+            (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
+    goto again;
+  else
+    {
+      _dbus_string_set_length (filename, 0);
+      if (!_dbus_string_append (filename, ent->d_name))
+        {
+          dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
+                          "No memory to read directory entry");
+          return FALSE;
+        }
+      else
+        return TRUE;
+    }
+}
+
+/**
+ * Closes a directory iteration.
+ */
+void
+_dbus_directory_close (DBusDirIter *iter)
+{
+  closedir (iter->d);
+  dbus_free (iter);
+}
+
+static dbus_bool_t
+fill_user_info_from_group (struct group  *g,
+                           DBusGroupInfo *info,
+                           DBusError     *error)
+{
+  _dbus_assert (g->gr_name != NULL);
+  
+  info->gid = g->gr_gid;
+  info->groupname = _dbus_strdup (g->gr_name);
+
+  /* info->members = dbus_strdupv (g->gr_mem) */
+  
+  if (info->groupname == NULL)
+    {
+      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
+      return FALSE;
+    }
+
+  return TRUE;
+}
+
+static dbus_bool_t
+fill_group_info (DBusGroupInfo    *info,
+                 dbus_gid_t        gid,
+                 const DBusString *groupname,
+                 DBusError        *error)
+{
+  const char *group_c_str;
+
+  _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
+  _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
+
+  if (groupname)
+    group_c_str = _dbus_string_get_const_data (groupname);
+  else
+    group_c_str = NULL;
+  
+  /* For now assuming that the getgrnam() and getgrgid() flavors
+   * always correspond to the pwnam flavors, if not we have
+   * to add more configure checks.
+   */
+  
+#if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
+  {
+    struct group *g;
+    int result;
+    char buf[1024];
+    struct group g_str;
+
+    g = NULL;
+#ifdef HAVE_POSIX_GETPWNAM_R
+
+    if (group_c_str)
+      result = getgrnam_r (group_c_str, &g_str, buf, sizeof (buf),
+                           &g);
+    else
+      result = getgrgid_r (gid, &g_str, buf, sizeof (buf),
+                           &g);
+#else
+    g = getgrnam_r (group_c_str, &g_str, buf, sizeof (buf));
+    result = 0;
+#endif /* !HAVE_POSIX_GETPWNAM_R */
+    if (result == 0 && g == &g_str)
+      {
+        return fill_user_info_from_group (g, info, error);
+      }
+    else
+      {
+        dbus_set_error (error, _dbus_error_from_errno (errno),
+                        "Group %s unknown or failed to look it up\n",
+                        group_c_str ? group_c_str : "???");
+        return FALSE;
+      }
+  }
+#else /* ! HAVE_GETPWNAM_R */
+  {
+    /* I guess we're screwed on thread safety here */
+    struct group *g;
+
+    g = getgrnam (group_c_str);
+
+    if (g != NULL)
+      {
+        return fill_user_info_from_group (g, info, error);
+      }
+    else
+      {
+        dbus_set_error (error, _dbus_error_from_errno (errno),
+                        "Group %s unknown or failed to look it up\n",
+                        group_c_str ? group_c_str : "???");
+        return FALSE;
+      }
+  }
+#endif  /* ! HAVE_GETPWNAM_R */
+}
+
+/**
+ * Initializes the given DBusGroupInfo struct
+ * with information about the given group name.
+ *
+ * @param info the group info struct
+ * @param groupname name of group
+ * @param error the error return
+ * @returns #FALSE if error is set
+ */
+dbus_bool_t
+_dbus_group_info_fill (DBusGroupInfo    *info,
+                       const DBusString *groupname,
+                       DBusError        *error)
+{
+  return fill_group_info (info, DBUS_GID_UNSET,
+                          groupname, error);
+
+}
+
+/**
+ * Initializes the given DBusGroupInfo struct
+ * with information about the given group ID.
+ *
+ * @param info the group info struct
+ * @param gid group ID
+ * @param error the error return
+ * @returns #FALSE if error is set
+ */
+dbus_bool_t
+_dbus_group_info_fill_gid (DBusGroupInfo *info,
+                           dbus_gid_t     gid,
+                           DBusError     *error)
+{
+  return fill_group_info (info, gid, NULL, error);
+}
+
+/** @} */ /* End of DBusInternalsUtils functions */
+
+/**
+ * @addtogroup DBusString
+ *
+ * @{
+ */
+/**
+ * Get the directory name from a complete filename
+ * @param filename the filename
+ * @param dirname string to append directory name to
+ * @returns #FALSE if no memory
+ */
+dbus_bool_t
+_dbus_string_get_dirname  (const DBusString *filename,
+                           DBusString       *dirname)
+{
+  int sep;
+  
+  _dbus_assert (filename != dirname);
+  _dbus_assert (filename != NULL);
+  _dbus_assert (dirname != NULL);
+
+  /* Ignore any separators on the end */
+  sep = _dbus_string_get_length (filename);
+  if (sep == 0)
+    return _dbus_string_append (dirname, "."); /* empty string passed in */
+    
+  while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
+    --sep;
+
+  _dbus_assert (sep >= 0);
+  
+  if (sep == 0)
+    return _dbus_string_append (dirname, "/");
+  
+  /* Now find the previous separator */
+  _dbus_string_find_byte_backward (filename, sep, '/', &sep);
+  if (sep < 0)
+    return _dbus_string_append (dirname, ".");
+  
+  /* skip multiple separators */
+  while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
+    --sep;
+
+  _dbus_assert (sep >= 0);
+  
+  if (sep == 0 &&
+      _dbus_string_get_byte (filename, 0) == '/')
+    return _dbus_string_append (dirname, "/");
+  else
+    return _dbus_string_copy_len (filename, 0, sep - 0,
+                                  dirname, _dbus_string_get_length (dirname));
+}
+/** @} */ /* DBusString stuff */
+
diff --git a/dbus/dbus-sysdeps-util.c b/dbus/dbus-sysdeps-util.c
index ebe20b4a..698b893e 100644
--- a/dbus/dbus-sysdeps-util.c
+++ b/dbus/dbus-sysdeps-util.c
@@ -1,5 +1,5 @@
 /* -*- mode: C; c-file-style: "gnu" -*- */
-/* dbus-sysdeps-util.c Would be in dbus-sysdeps.c, but not used in libdbus
+/* dbus-sysdeps-util.c Tests for dbus-sysdeps.h API
  * 
  * Copyright (C) 2002, 2003, 2004, 2005  Red Hat, Inc.
  * Copyright (C) 2003 CodeFactory AB
@@ -23,722 +23,9 @@
  */
 #include "dbus-sysdeps.h"
 #include "dbus-internals.h"
-#include "dbus-protocol.h"
 #include "dbus-string.h"
-#define DBUS_USERDB_INCLUDES_PRIVATE 1
-#include "dbus-userdb.h"
 #include "dbus-test.h"
 
-#include <sys/types.h>
-#include <stdlib.h>
-#include <string.h>
-#include <signal.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <grp.h>
-#include <sys/socket.h>
-#include <dirent.h>
-#include <sys/un.h>
-
-#ifndef O_BINARY
-#define O_BINARY 0
-#endif
-
-/**
- * @addtogroup DBusInternalsUtils
- * @{
- */
-
-/**
- * Does the chdir, fork, setsid, etc. to become a daemon process.
- *
- * @param pidfile #NULL, or pidfile to create
- * @param print_pid_fd file descriptor to print daemon's pid to, or -1 for none
- * @param error return location for errors
- * @returns #FALSE on failure
- */
-dbus_bool_t
-_dbus_become_daemon (const DBusString *pidfile,
-		     int               print_pid_fd,
-                     DBusError        *error)
-{
-  const char *s;
-  pid_t child_pid;
-  int dev_null_fd;
-
-  _dbus_verbose ("Becoming a daemon...\n");
-
-  _dbus_verbose ("chdir to /\n");
-  if (chdir ("/") < 0)
-    {
-      dbus_set_error (error, DBUS_ERROR_FAILED,
-                      "Could not chdir() to root directory");
-      return FALSE;
-    }
-
-  _dbus_verbose ("forking...\n");
-  switch ((child_pid = fork ()))
-    {
-    case -1:
-      _dbus_verbose ("fork failed\n");
-      dbus_set_error (error, _dbus_error_from_errno (errno),
-                      "Failed to fork daemon: %s", _dbus_strerror (errno));
-      return FALSE;
-      break;
-
-    case 0:
-      _dbus_verbose ("in child, closing std file descriptors\n");
-
-      /* silently ignore failures here, if someone
-       * doesn't have /dev/null we may as well try
-       * to continue anyhow
-       */
-      
-      dev_null_fd = open ("/dev/null", O_RDWR);
-      if (dev_null_fd >= 0)
-        {
-          dup2 (dev_null_fd, 0);
-          dup2 (dev_null_fd, 1);
-          
-          s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
-          if (s == NULL || *s == '\0')
-            dup2 (dev_null_fd, 2);
-          else
-            _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
-        }
-
-      /* Get a predictable umask */
-      _dbus_verbose ("setting umask\n");
-      umask (022);
-      break;
-
-    default:
-      if (pidfile)
-        {
-          _dbus_verbose ("parent writing pid file\n");
-          if (!_dbus_write_pid_file (pidfile,
-                                     child_pid,
-                                     error))
-            {
-              _dbus_verbose ("pid file write failed, killing child\n");
-              kill (child_pid, SIGTERM);
-              return FALSE;
-            }
-        }
-
-      /* Write PID if requested */
-      if (print_pid_fd >= 0)
-	{
-	  DBusString pid;
-	  int bytes;
-	  
-	  if (!_dbus_string_init (&pid))
-	    {
-	      _DBUS_SET_OOM (error);
-              kill (child_pid, SIGTERM);
-	      return FALSE;
-	    }
-	  
-	  if (!_dbus_string_append_int (&pid, child_pid) ||
-	      !_dbus_string_append (&pid, "\n"))
-	    {
-	      _dbus_string_free (&pid);
-	      _DBUS_SET_OOM (error);
-              kill (child_pid, SIGTERM);
-	      return FALSE;
-	    }
-	  
-	  bytes = _dbus_string_get_length (&pid);
-	  if (_dbus_write (print_pid_fd, &pid, 0, bytes) != bytes)
-	    {
-	      dbus_set_error (error, DBUS_ERROR_FAILED,
-			      "Printing message bus PID: %s\n",
-			      _dbus_strerror (errno));
-	      _dbus_string_free (&pid);
-              kill (child_pid, SIGTERM);
-	      return FALSE;
-	    }
-	  
-	  _dbus_string_free (&pid);
-	}
-      _dbus_verbose ("parent exiting\n");
-      _exit (0);
-      break;
-    }
-
-  _dbus_verbose ("calling setsid()\n");
-  if (setsid () == -1)
-    _dbus_assert_not_reached ("setsid() failed");
-  
-  return TRUE;
-}
-
-
-/**
- * Creates a file containing the process ID.
- *
- * @param filename the filename to write to
- * @param pid our process ID
- * @param error return location for errors
- * @returns #FALSE on failure
- */
-dbus_bool_t
-_dbus_write_pid_file (const DBusString *filename,
-                      unsigned long     pid,
-		      DBusError        *error)
-{
-  const char *cfilename;
-  int fd;
-  FILE *f;
-
-  cfilename = _dbus_string_get_const_data (filename);
-  
-  fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
-  
-  if (fd < 0)
-    {
-      dbus_set_error (error, _dbus_error_from_errno (errno),
-                      "Failed to open \"%s\": %s", cfilename,
-                      _dbus_strerror (errno));
-      return FALSE;
-    }
-
-  if ((f = fdopen (fd, "w")) == NULL)
-    {
-      dbus_set_error (error, _dbus_error_from_errno (errno),
-                      "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
-      close (fd);
-      return FALSE;
-    }
-  
-  if (fprintf (f, "%lu\n", pid) < 0)
-    {
-      dbus_set_error (error, _dbus_error_from_errno (errno),
-                      "Failed to write to \"%s\": %s", cfilename,
-                      _dbus_strerror (errno));
-      
-      fclose (f);
-      return FALSE;
-    }
-
-  if (fclose (f) == EOF)
-    {
-      dbus_set_error (error, _dbus_error_from_errno (errno),
-                      "Failed to close \"%s\": %s", cfilename,
-                      _dbus_strerror (errno));
-      return FALSE;
-    }
-  
-  return TRUE;
-}
-
-
-/**
- * Changes the user and group the bus is running as.
- *
- * @param uid the new user ID
- * @param gid the new group ID
- * @param error return location for errors
- * @returns #FALSE on failure
- */
-dbus_bool_t
-_dbus_change_identity  (dbus_uid_t     uid,
-                        dbus_gid_t     gid,
-                        DBusError     *error)
-{
-  /* setgroups() only works if we are a privileged process,
-   * so we don't return error on failure; the only possible
-   * failure is that we don't have perms to do it.
-   * FIXME not sure this is right, maybe if setuid()
-   * is going to work then setgroups() should also work.
-   */
-  if (setgroups (0, NULL) < 0)
-    _dbus_warn ("Failed to drop supplementary groups: %s\n",
-                _dbus_strerror (errno));
-  
-  /* Set GID first, or the setuid may remove our permission
-   * to change the GID
-   */
-  if (setgid (gid) < 0)
-    {
-      dbus_set_error (error, _dbus_error_from_errno (errno),
-                      "Failed to set GID to %lu: %s", gid,
-                      _dbus_strerror (errno));
-      return FALSE;
-    }
-  
-  if (setuid (uid) < 0)
-    {
-      dbus_set_error (error, _dbus_error_from_errno (errno),
-                      "Failed to set UID to %lu: %s", uid,
-                      _dbus_strerror (errno));
-      return FALSE;
-    }
-  
-  return TRUE;
-}
-
-/** Installs a UNIX signal handler
- *
- * @param sig the signal to handle
- * @param handler the handler
- */
-void
-_dbus_set_signal_handler (int               sig,
-                          DBusSignalHandler handler)
-{
-  struct sigaction act;
-  sigset_t empty_mask;
-  
-  sigemptyset (&empty_mask);
-  act.sa_handler = handler;
-  act.sa_mask    = empty_mask;
-  act.sa_flags   = 0;
-  sigaction (sig,  &act, NULL);
-}
-
-
-/**
- * Removes a directory; Directory must be empty
- * 
- * @param filename directory filename
- * @param error initialized error object
- * @returns #TRUE on success
- */
-dbus_bool_t
-_dbus_delete_directory (const DBusString *filename,
-			DBusError        *error)
-{
-  const char *filename_c;
-  
-  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-
-  filename_c = _dbus_string_get_const_data (filename);
-
-  if (rmdir (filename_c) != 0)
-    {
-      dbus_set_error (error, DBUS_ERROR_FAILED,
-		      "Failed to remove directory %s: %s\n",
-		      filename_c, _dbus_strerror (errno));
-      return FALSE;
-    }
-  
-  return TRUE;
-}
-
-/** Checks if a file exists
-*
-* @param file full path to the file
-* @returns #TRUE if file exists
-*/
-dbus_bool_t 
-_dbus_file_exists (const char *file)
-{
-  return (access (file, F_OK) == 0);
-}
-
-/** Checks if user is at the console
-*
-* @param username user to check
-* @param error return location for errors
-* @returns #TRUE is the user is at the consolei and there are no errors
-*/
-dbus_bool_t 
-_dbus_user_at_console (const char *username,
-                       DBusError  *error)
-{
-
-  DBusString f;
-  dbus_bool_t result;
-
-  result = FALSE;
-  if (!_dbus_string_init (&f))
-    {
-      _DBUS_SET_OOM (error);
-      return FALSE;
-    }
-
-  if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR))
-    {
-      _DBUS_SET_OOM (error);
-      goto out;
-    }
-
-
-  if (!_dbus_string_append (&f, username))
-    {
-      _DBUS_SET_OOM (error);
-      goto out;
-    }
-
-  result = _dbus_file_exists (_dbus_string_get_const_data (&f));
-
- out:
-  _dbus_string_free (&f);
-
-  return result;
-}
-
-
-/**
- * Checks whether the filename is an absolute path
- *
- * @param filename the filename
- * @returns #TRUE if an absolute path
- */
-dbus_bool_t
-_dbus_path_is_absolute (const DBusString *filename)
-{
-  if (_dbus_string_get_length (filename) > 0)
-    return _dbus_string_get_byte (filename, 0) == '/';
-  else
-    return FALSE;
-}
-
-/**
- * stat() wrapper.
- *
- * @param filename the filename to stat
- * @param statbuf the stat info to fill in
- * @param error return location for error
- * @returns #FALSE if error was set
- */
-dbus_bool_t
-_dbus_stat (const DBusString *filename,
-            DBusStat         *statbuf,
-            DBusError        *error)
-{
-  const char *filename_c;
-  struct stat sb;
-
-  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-  
-  filename_c = _dbus_string_get_const_data (filename);
-
-  if (stat (filename_c, &sb) < 0)
-    {
-      dbus_set_error (error, _dbus_error_from_errno (errno),
-                      "%s", _dbus_strerror (errno));
-      return FALSE;
-    }
-
-  statbuf->mode = sb.st_mode;
-  statbuf->nlink = sb.st_nlink;
-  statbuf->uid = sb.st_uid;
-  statbuf->gid = sb.st_gid;
-  statbuf->size = sb.st_size;
-  statbuf->atime = sb.st_atime;
-  statbuf->mtime = sb.st_mtime;
-  statbuf->ctime = sb.st_ctime;
-
-  return TRUE;
-}
-
-
-/**
- * Internals of directory iterator
- */
-struct DBusDirIter
-{
-  DIR *d; /**< The DIR* from opendir() */
-  
-};
-
-/**
- * Open a directory to iterate over.
- *
- * @param filename the directory name
- * @param error exception return object or #NULL
- * @returns new iterator, or #NULL on error
- */
-DBusDirIter*
-_dbus_directory_open (const DBusString *filename,
-                      DBusError        *error)
-{
-  DIR *d;
-  DBusDirIter *iter;
-  const char *filename_c;
-
-  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-  
-  filename_c = _dbus_string_get_const_data (filename);
-
-  d = opendir (filename_c);
-  if (d == NULL)
-    {
-      dbus_set_error (error, _dbus_error_from_errno (errno),
-                      "Failed to read directory \"%s\": %s",
-                      filename_c,
-                      _dbus_strerror (errno));
-      return NULL;
-    }
-  iter = dbus_new0 (DBusDirIter, 1);
-  if (iter == NULL)
-    {
-      closedir (d);
-      dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
-                      "Could not allocate memory for directory iterator");
-      return NULL;
-    }
-
-  iter->d = d;
-
-  return iter;
-}
-
-/**
- * Get next file in the directory. Will not return "." or ".."  on
- * UNIX. If an error occurs, the contents of "filename" are
- * undefined. The error is never set if the function succeeds.
- *
- * @todo for thread safety, I think we have to use
- * readdir_r(). (GLib has the same issue, should file a bug.)
- *
- * @param iter the iterator
- * @param filename string to be set to the next file in the dir
- * @param error return location for error
- * @returns #TRUE if filename was filled in with a new filename
- */
-dbus_bool_t
-_dbus_directory_get_next_file (DBusDirIter      *iter,
-                               DBusString       *filename,
-                               DBusError        *error)
-{
-  struct dirent *ent;
-
-  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
-  
- again:
-  errno = 0;
-  ent = readdir (iter->d);
-  if (ent == NULL)
-    {
-      if (errno != 0)
-        dbus_set_error (error,
-                        _dbus_error_from_errno (errno),
-                        "%s", _dbus_strerror (errno));
-      return FALSE;
-    }
-  else if (ent->d_name[0] == '.' &&
-           (ent->d_name[1] == '\0' ||
-            (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
-    goto again;
-  else
-    {
-      _dbus_string_set_length (filename, 0);
-      if (!_dbus_string_append (filename, ent->d_name))
-        {
-          dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
-                          "No memory to read directory entry");
-          return FALSE;
-        }
-      else
-        return TRUE;
-    }
-}
-
-/**
- * Closes a directory iteration.
- */
-void
-_dbus_directory_close (DBusDirIter *iter)
-{
-  closedir (iter->d);
-  dbus_free (iter);
-}
-
-static dbus_bool_t
-fill_user_info_from_group (struct group  *g,
-                           DBusGroupInfo *info,
-                           DBusError     *error)
-{
-  _dbus_assert (g->gr_name != NULL);
-  
-  info->gid = g->gr_gid;
-  info->groupname = _dbus_strdup (g->gr_name);
-
-  /* info->members = dbus_strdupv (g->gr_mem) */
-  
-  if (info->groupname == NULL)
-    {
-      dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
-      return FALSE;
-    }
-
-  return TRUE;
-}
-
-static dbus_bool_t
-fill_group_info (DBusGroupInfo    *info,
-                 dbus_gid_t        gid,
-                 const DBusString *groupname,
-                 DBusError        *error)
-{
-  const char *group_c_str;
-
-  _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
-  _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
-
-  if (groupname)
-    group_c_str = _dbus_string_get_const_data (groupname);
-  else
-    group_c_str = NULL;
-  
-  /* For now assuming that the getgrnam() and getgrgid() flavors
-   * always correspond to the pwnam flavors, if not we have
-   * to add more configure checks.
-   */
-  
-#if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
-  {
-    struct group *g;
-    int result;
-    char buf[1024];
-    struct group g_str;
-
-    g = NULL;
-#ifdef HAVE_POSIX_GETPWNAM_R
-
-    if (group_c_str)
-      result = getgrnam_r (group_c_str, &g_str, buf, sizeof (buf),
-                           &g);
-    else
-      result = getgrgid_r (gid, &g_str, buf, sizeof (buf),
-                           &g);
-#else
-    g = getgrnam_r (group_c_str, &g_str, buf, sizeof (buf));
-    result = 0;
-#endif /* !HAVE_POSIX_GETPWNAM_R */
-    if (result == 0 && g == &g_str)
-      {
-        return fill_user_info_from_group (g, info, error);
-      }
-    else
-      {
-        dbus_set_error (error, _dbus_error_from_errno (errno),
-                        "Group %s unknown or failed to look it up\n",
-                        group_c_str ? group_c_str : "???");
-        return FALSE;
-      }
-  }
-#else /* ! HAVE_GETPWNAM_R */
-  {
-    /* I guess we're screwed on thread safety here */
-    struct group *g;
-
-    g = getgrnam (group_c_str);
-
-    if (g != NULL)
-      {
-        return fill_user_info_from_group (g, info, error);
-      }
-    else
-      {
-        dbus_set_error (error, _dbus_error_from_errno (errno),
-                        "Group %s unknown or failed to look it up\n",
-                        group_c_str ? group_c_str : "???");
-        return FALSE;
-      }
-  }
-#endif  /* ! HAVE_GETPWNAM_R */
-}
-
-/**
- * Initializes the given DBusGroupInfo struct
- * with information about the given group name.
- *
- * @param info the group info struct
- * @param groupname name of group
- * @param error the error return
- * @returns #FALSE if error is set
- */
-dbus_bool_t
-_dbus_group_info_fill (DBusGroupInfo    *info,
-                       const DBusString *groupname,
-                       DBusError        *error)
-{
-  return fill_group_info (info, DBUS_GID_UNSET,
-                          groupname, error);
-
-}
-
-/**
- * Initializes the given DBusGroupInfo struct
- * with information about the given group ID.
- *
- * @param info the group info struct
- * @param gid group ID
- * @param error the error return
- * @returns #FALSE if error is set
- */
-dbus_bool_t
-_dbus_group_info_fill_gid (DBusGroupInfo *info,
-                           dbus_gid_t     gid,
-                           DBusError     *error)
-{
-  return fill_group_info (info, gid, NULL, error);
-}
-
-/** @} */ /* End of DBusInternalsUtils functions */
-
-/**
- * @addtogroup DBusString
- *
- * @{
- */
-/**
- * Get the directory name from a complete filename
- * @param filename the filename
- * @param dirname string to append directory name to
- * @returns #FALSE if no memory
- */
-dbus_bool_t
-_dbus_string_get_dirname  (const DBusString *filename,
-                           DBusString       *dirname)
-{
-  int sep;
-  
-  _dbus_assert (filename != dirname);
-  _dbus_assert (filename != NULL);
-  _dbus_assert (dirname != NULL);
-
-  /* Ignore any separators on the end */
-  sep = _dbus_string_get_length (filename);
-  if (sep == 0)
-    return _dbus_string_append (dirname, "."); /* empty string passed in */
-    
-  while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
-    --sep;
-
-  _dbus_assert (sep >= 0);
-  
-  if (sep == 0)
-    return _dbus_string_append (dirname, "/");
-  
-  /* Now find the previous separator */
-  _dbus_string_find_byte_backward (filename, sep, '/', &sep);
-  if (sep < 0)
-    return _dbus_string_append (dirname, ".");
-  
-  /* skip multiple separators */
-  while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
-    --sep;
-
-  _dbus_assert (sep >= 0);
-  
-  if (sep == 0 &&
-      _dbus_string_get_byte (filename, 0) == '/')
-    return _dbus_string_append (dirname, "/");
-  else
-    return _dbus_string_copy_len (filename, 0, sep - 0,
-                                  dirname, _dbus_string_get_length (dirname));
-}
-/** @} */ /* DBusString stuff */
-
-
 #ifdef DBUS_BUILD_TESTS
 #include <stdlib.h>
 static void