26 #include "dbus-sysdeps.h"    27 #include "dbus-sysdeps-unix.h"    28 #include "dbus-internals.h"    29 #include "dbus-pipe.h"    30 #include "dbus-protocol.h"    31 #include "dbus-string.h"    32 #define DBUS_USERDB_INCLUDES_PRIVATE 1    33 #include "dbus-userdb.h"    34 #include "dbus-test.h"    36 #include <sys/types.h>    45 #ifdef HAVE_SYS_RESOURCE_H    46 #include <sys/resource.h>    49 #include <sys/socket.h>    57 #ifdef HAVE_SYS_SYSLIMITS_H    58 #include <sys/syslimits.h>    62 #include <systemd/sd-daemon.h>    94   _dbus_verbose (
"Becoming a daemon...\n");
    96   _dbus_verbose (
"chdir to /\n");
   100                       "Could not chdir() to root directory");
   104   _dbus_verbose (
"forking...\n");
   105   switch ((child_pid = fork ()))
   108       _dbus_verbose (
"fork failed\n");
   110                       "Failed to fork daemon: %s", _dbus_strerror (errno));
   115       _dbus_verbose (
"in child, closing std file descriptors\n");
   122       dev_null_fd = open (
"/dev/null", O_RDWR);
   123       if (dev_null_fd >= 0)
   125           dup2 (dev_null_fd, 0);
   126           dup2 (dev_null_fd, 1);
   129           if (s == 
NULL || *s == 
'\0')
   130             dup2 (dev_null_fd, 2);
   132             _dbus_verbose (
"keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
   139           _dbus_verbose (
"setting umask\n");
   143       _dbus_verbose (
"calling setsid()\n");
   153           _dbus_verbose (
"pid file or pipe write failed: %s\n",
   155           kill (child_pid, SIGTERM);
   159       _dbus_verbose (
"parent exiting\n");
   177 _dbus_write_pid_file (
const DBusString *filename,
   181   const char *cfilename;
   185   cfilename = _dbus_string_get_const_data (filename);
   187   fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
   192                       "Failed to open \"%s\": %s", cfilename,
   193                       _dbus_strerror (errno));
   197   if ((f = fdopen (fd, 
"w")) == 
NULL)
   200                       "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
   205   if (fprintf (f, 
"%lu\n", pid) < 0)
   208                       "Failed to write to \"%s\": %s", cfilename,
   209                       _dbus_strerror (errno));
   215   if (fclose (f) == EOF)
   218                       "Failed to close \"%s\": %s", cfilename,
   219                       _dbus_strerror (errno));
   245       _dbus_verbose (
"writing pid file %s\n", _dbus_string_get_const_data (pidfile));
   246       if (!_dbus_write_pid_file (pidfile,
   250           _dbus_verbose (
"pid file write failed\n");
   251           _DBUS_ASSERT_ERROR_IS_SET(error);
   257       _dbus_verbose (
"No pid file requested\n");
   260   if (print_pid_pipe != 
NULL && _dbus_pipe_is_valid (print_pid_pipe))
   265       _dbus_verbose (
"writing our pid to pipe %d\n",
   270           _DBUS_SET_OOM (error);
   278           _DBUS_SET_OOM (error);
   282       bytes = _dbus_string_get_length (&pid);
   283       if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
   289                               "Printing message bus PID: did not write enough bytes\n");
   299       _dbus_verbose (
"No pid pipe to write to\n");
   323 #ifndef HAVE_LIBAUDIT   344                       "User '%s' does not appear to exist?",
   356   if (setgroups (0, 
NULL) < 0)
   357     _dbus_warn (
"Failed to drop supplementary groups: %s\n",
   358                 _dbus_strerror (errno));
   363   if (setgid (gid) < 0)
   366                       "Failed to set GID to %lu: %s", gid,
   367                       _dbus_strerror (errno));
   371   if (setuid (uid) < 0)
   374                       "Failed to set UID to %lu: %s", uid,
   375                       _dbus_strerror (errno));
   383 #ifdef HAVE_SETRLIMIT   394 _dbus_rlimit_save_fd_limit (
DBusError *error)
   402       _DBUS_SET_OOM (error);
   406   if (getrlimit (RLIMIT_NOFILE, &self->lim) < 0)
   409                       "Failed to get fd limit: %s", _dbus_strerror (errno));
   418 _dbus_rlimit_raise_fd_limit_if_privileged (
unsigned int  desired,
   435   if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
   438                       "Failed to get fd limit: %s", _dbus_strerror (errno));
   442   if (lim.rlim_cur == RLIM_INFINITY || lim.rlim_cur >= desired)
   451   lim.rlim_cur = lim.rlim_max = desired;
   453   if (setrlimit (RLIMIT_NOFILE, &lim) < 0)
   456                       "Failed to set fd limit to %u: %s",
   457                       desired, _dbus_strerror (errno));
   465 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
   468   if (setrlimit (RLIMIT_NOFILE, &saved->lim) < 0)
   471                       "Failed to restore old fd limit: %s",
   472                       _dbus_strerror (errno));
   482 fd_limit_not_supported (
DBusError *error)
   485                   "cannot change fd limit on this platform");
   489 _dbus_rlimit_save_fd_limit (
DBusError *error)
   491   fd_limit_not_supported (error);
   496 _dbus_rlimit_raise_fd_limit_if_privileged (
unsigned int  desired,
   499   fd_limit_not_supported (error);
   504 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
   507   fd_limit_not_supported (error);
   514 _dbus_rlimit_free (DBusRLimit *lim)
   523   int logopts = LOG_PID;
   525 #if HAVE_DECL_LOG_PERROR   527   if (!is_daemon || sd_booted () <= 0)
   529     logopts |= LOG_PERROR;
   532   openlog (
"dbus", logopts, LOG_DAEMON);
   547   va_start (args, msg);
   572       case DBUS_SYSTEM_LOG_INFO:
   573         flags =  LOG_DAEMON | LOG_NOTICE;
   575       case DBUS_SYSTEM_LOG_WARNING:
   576         flags =  LOG_DAEMON | LOG_WARNING;
   578       case DBUS_SYSTEM_LOG_SECURITY:
   579         flags = LOG_AUTH | LOG_NOTICE;
   581       case DBUS_SYSTEM_LOG_FATAL:
   582         flags = LOG_DAEMON|LOG_CRIT;
   588   DBUS_VA_COPY (tmp, args);
   589   vsyslog (flags, msg, tmp);
   593 #if !defined(HAVE_SYSLOG_H) || !HAVE_DECL_LOG_PERROR   596       DBUS_VA_COPY (tmp, args);
   598       vfprintf (stderr, msg, tmp);
   599       fputc (
'\n', stderr);
   604   if (severity == DBUS_SYSTEM_LOG_FATAL)
   617   struct sigaction act;
   620   sigemptyset (&empty_mask);
   621   act.sa_handler = handler;
   622   act.sa_mask    = empty_mask;
   624   sigaction (sig,  &act, 
NULL);
   635   return (access (file, F_OK) == 0);
   655       _DBUS_SET_OOM (error);
   661       _DBUS_SET_OOM (error);
   669       _DBUS_SET_OOM (error);
   691   if (_dbus_string_get_length (filename) > 0)
   692     return _dbus_string_get_byte (filename, 0) == 
'/';
   710   const char *filename_c;
   713   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
   715   filename_c = _dbus_string_get_const_data (filename);
   717   if (stat (filename_c, &sb) < 0)
   720                       "%s", _dbus_strerror (errno));
   724   statbuf->
mode = sb.st_mode;
   725   statbuf->
nlink = sb.st_nlink;
   726   statbuf->
uid = sb.st_uid;
   727   statbuf->
gid = sb.st_gid;
   728   statbuf->
size = sb.st_size;
   729   statbuf->
atime = sb.st_atime;
   730   statbuf->
mtime = sb.st_mtime;
   731   statbuf->
ctime = sb.st_ctime;
   759   const char *filename_c;
   761   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
   763   filename_c = _dbus_string_get_const_data (filename);
   765   d = opendir (filename_c);
   769                       "Failed to read directory \"%s\": %s",
   771                       _dbus_strerror (errno));
   779                       "Could not allocate memory for directory iterator");
   809   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
   813   ent = readdir (iter->
d);
   822                         "%s", _dbus_strerror (err));
   826   else if (ent->d_name[0] == 
'.' &&
   827            (ent->d_name[1] == 
'\0' ||
   828             (ent->d_name[1] == 
'.' && ent->d_name[2] == 
'\0')))
   836                           "No memory to read directory entry");
   857 fill_user_info_from_group (
struct group  *g,
   863   info->
gid = g->gr_gid;
   883   const char *group_c_str;
   889     group_c_str = _dbus_string_get_const_data (groupname);
   898 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)   908     buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
   914     if ((
long) buflen <= 0)
   928 #ifdef HAVE_POSIX_GETPWNAM_R   930           result = getgrnam_r (group_c_str, &g_str, buf, buflen,
   933           result = getgrgid_r (gid, &g_str, buf, buflen,
   936         g = getgrnam_r (group_c_str, &g_str, buf, buflen);
   942         if (result == ERANGE && buflen < 512 * 1024)
   953     if (result == 0 && g == &g_str)
   955         b = fill_user_info_from_group (g, info, error);
   962                         "Group %s unknown or failed to look it up\n",
   963                         group_c_str ? group_c_str : 
"???");
   973     g = getgrnam (group_c_str);
   977         return fill_user_info_from_group (g, info, error);
   982                         "Group %s unknown or failed to look it up\n",
   983                         group_c_str ? group_c_str : 
"???");
  1023   return fill_group_info (info, gid, 
NULL, error);
  1142   sep = _dbus_string_get_length (filename);
  1146   while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == 
'/')
  1160   while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == 
'/')
  1166       _dbus_string_get_byte (filename, 0) == 
'/')
  1170                                   dirname, _dbus_string_get_length (dirname));
  1180   buf = _dbus_string_get_data (str);
  1181   len = _dbus_string_get_length (str);
  1183   for (i = 0; i < len; i++)
  1185       unsigned char c = (
unsigned char) buf[i];
  1188       else if (c < 0x20 || c > 127)
  1220       _DBUS_SET_OOM (error);
  1226       _DBUS_SET_OOM (error);
  1234   fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
  1239                       "Failed to open \"%s\": %s",
  1240                       _dbus_string_get_const_data (&path),
  1241                       _dbus_strerror (errno));
  1249                       "Failed to read from \"%s\": %s",
  1250                       _dbus_string_get_const_data (&path),
  1251                       _dbus_strerror (errno));      
  1259   string_squash_nonprintable (&cmdline);  
  1268   _DBUS_SET_OOM (error);
  1283 _dbus_replace_install_prefix (
const char *configure_time_path)
  1285   return configure_time_path;
  1288 #define DBUS_UNIX_STANDARD_SESSION_SERVICEDIR "/dbus-1/services"  1289 #define DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR "/dbus-1/system-services"  1311   const char *xdg_data_home;
  1312   const char *xdg_data_dirs;
  1321   if (xdg_data_home != 
NULL)
  1345   if (xdg_data_dirs != 
NULL)
  1369                                      DBUS_UNIX_STANDARD_SESSION_SERVICEDIR,
  1412   static const char standard_search_path[] =
  1422                                        DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR,
 dbus_bool_t _dbus_string_append(DBusString *str, const char *buffer)
Appends a nul-terminated C-style string to a DBusString. 
dbus_bool_t _dbus_split_paths_and_append(DBusString *dirs, const char *suffix, DBusList **dir_list)
Split paths into a list of char strings. 
const char * message
public error message field 
#define NULL
A null pointer, defined appropriately for C or C++. 
dbus_bool_t _dbus_append_system_config_file(DBusString *str)
Append the absolute path of the system.conf file (there is no system bus on Windows so this can just ...
dbus_bool_t _dbus_become_daemon(const DBusString *pidfile, DBusPipe *print_pid_pipe, DBusError *error, dbus_bool_t keep_umask)
Does the chdir, fork, setsid, etc. 
dbus_bool_t _dbus_unix_user_is_at_console(dbus_uid_t uid, DBusError *error)
Checks to see if the UNIX user ID is at the console. 
dbus_bool_t _dbus_group_info_fill_gid(DBusGroupInfo *info, dbus_gid_t gid, DBusError *error)
Initializes the given DBusGroupInfo struct with information about the given group ID...
dbus_bool_t _dbus_string_get_dirname(const DBusString *filename, DBusString *dirname)
Get the directory name from a complete filename. 
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0(). 
dbus_bool_t _dbus_path_is_absolute(const DBusString *filename)
Checks whether the filename is an absolute path. 
void _dbus_system_log(DBusSystemLogSeverity severity, const char *msg,...)
Log a message to the system log file (e.g. 
Portable struct with stat() results. 
#define DBUS_ERROR_NOT_SUPPORTED
Requested operation isn't supported (like ENOSYS on UNIX). 
DBUS_PRIVATE_EXPORT dbus_bool_t _dbus_string_append_int(DBusString *str, long value)
Appends an integer to a DBusString. 
dbus_bool_t _dbus_groups_from_uid(dbus_uid_t uid, dbus_gid_t **group_ids, int *n_group_ids)
Gets all groups corresponding to the given UID. 
#define DBUS_PID_FORMAT
an appropriate printf format for dbus_pid_t 
dbus_bool_t _dbus_parse_unix_group_from_config(const DBusString *groupname, dbus_gid_t *gid_p)
Parse a UNIX group from the bus config file. 
void _dbus_directory_close(DBusDirIter *iter)
Closes a directory iteration. 
dbus_bool_t _dbus_is_console_user(dbus_uid_t uid, DBusError *error)
Checks to see if the UID sent in is the console user. 
#define _dbus_assert(condition)
Aborts with an error message if the condition is false. 
dbus_bool_t _dbus_directory_get_next_file(DBusDirIter *iter, DBusString *filename, DBusError *error)
Get next file in the directory. 
unsigned long atime
Access time. 
dbus_bool_t _dbus_get_standard_session_servicedirs(DBusList **dirs)
Returns the standard directories for a session bus to look for service activation files...
dbus_pid_t _dbus_getpid(void)
Gets our process ID. 
dbus_bool_t _dbus_concat_dir_and_file(DBusString *dir, const DBusString *next_component)
Appends the given filename to the given directory. 
DBusDirIter * _dbus_directory_open(const DBusString *filename, DBusError *error)
Open a directory to iterate over. 
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string. 
dbus_bool_t _dbus_command_for_pid(unsigned long pid, DBusString *str, int max_len, DBusError *error)
Get a printable string describing the command used to execute the process with pid. 
dbus_bool_t _dbus_string_copy(const DBusString *source, int start, DBusString *dest, int insert_at)
Like _dbus_string_move(), but does not delete the section of the source string that's copied to the d...
char * groupname
Group name. 
void(* DBusSignalHandler)(int sig)
A UNIX signal handler. 
const char * _dbus_error_from_errno(int error_number)
Converts a UNIX errno, or Windows errno or WinSock error value into a DBusError name. 
Internals of directory iterator. 
unsigned long mode
File mode. 
unsigned long dbus_pid_t
A process ID. 
dbus_bool_t _dbus_get_user_id_and_primary_group(const DBusString *username, dbus_uid_t *uid_p, dbus_gid_t *gid_p)
Gets user ID and primary group given username. 
dbus_bool_t _dbus_change_to_daemon_user(const char *user, DBusError *error)
Changes the user and group the bus is running as. 
DIR * d
The DIR* from opendir() 
void * dbus_malloc(size_t bytes)
Allocates the given number of bytes, as with standard malloc(). 
dbus_gid_t gid
Group owning file. 
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0(). 
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE. 
void _dbus_string_init_const(DBusString *str, const char *value)
Initializes a constant string. 
void _dbus_warn(const char *format,...)
Prints a warning message to stderr. 
int _dbus_read(int fd, DBusString *buffer, int count)
Thin wrapper around the read() system call that appends the data it reads to the DBusString buffer...
dbus_bool_t _dbus_string_append_printf(DBusString *str, const char *format,...)
Appends a printf-style formatted string to the DBusString. 
dbus_bool_t _dbus_group_info_fill(DBusGroupInfo *info, const DBusString *groupname, DBusError *error)
Initializes the given DBusGroupInfo struct with information about the given group name...
dbus_bool_t _dbus_get_group_id(const DBusString *groupname, dbus_gid_t *gid)
Gets group ID given groupname. 
Object representing an exception. 
void dbus_set_error(DBusError *error, const char *name, const char *format,...)
Assigns an error name and message to a DBusError. 
dbus_bool_t _dbus_unix_groups_from_uid(dbus_uid_t uid, dbus_gid_t **group_ids, int *n_group_ids)
Gets all groups corresponding to the given UNIX user ID. 
unsigned long ctime
Creation time. 
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init(). 
#define DBUS_GID_UNSET
an invalid GID used to represent an uninitialized dbus_gid_t field 
dbus_uid_t _dbus_geteuid(void)
Gets our effective UID. 
dbus_bool_t _dbus_file_exists(const char *file)
Checks if a file exists. 
#define TRUE
Expands to "1". 
unsigned long nlink
Number of hard links. 
#define _dbus_assert_not_reached(explanation)
Aborts with an error message if called. 
dbus_bool_t _dbus_write_pid_to_file_and_pipe(const DBusString *pidfile, DBusPipe *print_pid_pipe, dbus_pid_t pid_to_write, DBusError *error)
Writes the given pid_to_write to a pidfile (if non-NULL) and/or to a pipe (if non-NULL). 
dbus_uid_t uid
User owning file. 
void _dbus_system_logv(DBusSystemLogSeverity severity, const char *msg, va_list args)
Log a message to the system log file (e.g. 
#define DBUS_ERROR_FAILED
A generic error; "something went wrong" - see the error message for more. 
dbus_bool_t _dbus_verify_daemon_user(const char *user)
Verify that after the fork we can successfully change to this user. 
dbus_bool_t _dbus_string_find_byte_backward(const DBusString *str, int start, unsigned char byte, int *found)
Find the given byte scanning backward from the given start. 
dbus_bool_t _dbus_homedir_from_current_process(const DBusString **homedir)
Gets homedir of user owning current process. 
Information about a UNIX group. 
dbus_bool_t _dbus_stat(const DBusString *filename, DBusStat *statbuf, DBusError *error)
stat() wrapper. 
dbus_bool_t _dbus_get_user_id(const DBusString *username, dbus_uid_t *uid)
Gets user ID given username. 
void _dbus_set_signal_handler(int sig, DBusSignalHandler handler)
Installs a UNIX signal handler. 
dbus_bool_t _dbus_unix_user_is_process_owner(dbus_uid_t uid)
Checks to see if the UNIX user ID matches the UID of the process. 
dbus_bool_t _dbus_user_at_console(const char *username, DBusError *error)
Checks if user is at the console. 
dbus_bool_t _dbus_windows_user_is_process_owner(const char *windows_sid)
Checks to see if the Windows user SID matches the owner of the process. 
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation. 
dbus_bool_t _dbus_close(int fd, DBusError *error)
Closes a file descriptor. 
#define FALSE
Expands to "0". 
unsigned long mtime
Modify time. 
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string. 
dbus_bool_t _dbus_string_copy_len(const DBusString *source, int start, int len, DBusString *dest, int insert_at)
Like _dbus_string_copy(), but can copy a segment from the middle of the source string. 
unsigned long dbus_gid_t
A group ID. 
unsigned long size
Size of file. 
dbus_bool_t _dbus_parse_unix_user_from_config(const DBusString *username, dbus_uid_t *uid_p)
Parse a UNIX user from the bus config file. 
char * _dbus_strdup(const char *str)
Duplicates a string. 
dbus_bool_t _dbus_append_session_config_file(DBusString *str)
Append the absolute path of the session.conf file. 
const char * _dbus_getenv(const char *varname)
Wrapper for getenv(). 
unsigned long dbus_uid_t
A user ID. 
dbus_bool_t _dbus_get_standard_system_servicedirs(DBusList **dirs)
Returns the standard directories for a system bus to look for service activation files. 
dbus_bool_t dbus_error_is_set(const DBusError *error)
Checks whether an error occurred (the error is set).