/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ /* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * */ #include #include "dbus-sysdeps.h" #include "dbus-sysdeps-unix.h" #include "dbus-internals.h" #include "dbus-pipe.h" #include "dbus-protocol.h" #include "dbus-string.h" #define DBUS_USERDB_INCLUDES_PRIVATE 1 #include "dbus-userdb.h" #include "dbus-test.h" #include #include #include #include #include #include #include #include #include #ifdef HAVE_SYS_RESOURCE_H #include #endif #include #include #include #include #ifdef HAVE_SYSLOG_H #include #endif #ifdef HAVE_SYS_SYSLIMITS_H #include #endif #ifdef HAVE_SYSTEMD #include #endif #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_pipe pipe to print daemon's pid to, or -1 for none * @param error return location for errors * @param keep_umask #TRUE to keep the original umask * @returns #FALSE on failure */ dbus_bool_t _dbus_become_daemon (const DBusString *pidfile, DBusPipe *print_pid_pipe, DBusError *error, dbus_bool_t keep_umask) { 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"); close (dev_null_fd); } if (!keep_umask) { /* Get a predictable umask */ _dbus_verbose ("setting umask\n"); umask (022); } _dbus_verbose ("calling setsid()\n"); if (setsid () == -1) _dbus_assert_not_reached ("setsid() failed"); break; default: if (!_dbus_write_pid_to_file_and_pipe (pidfile, print_pid_pipe, child_pid, error)) { _dbus_verbose ("pid file or pipe write failed: %s\n", error->message); kill (child_pid, SIGTERM); return FALSE; } _dbus_verbose ("parent exiting\n"); _exit (0); break; } 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 */ static 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)); _dbus_close (fd, NULL); 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; } /** * Writes the given pid_to_write to a pidfile (if non-NULL) and/or to a * pipe (if non-NULL). Does nothing if pidfile and print_pid_pipe are both * NULL. * * @param pidfile the file to write to or #NULL * @param print_pid_pipe the pipe to write to or #NULL * @param pid_to_write the pid to write out * @param error error on failure * @returns FALSE if error is set */ 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) { if (pidfile) { _dbus_verbose ("writing pid file %s\n", _dbus_string_get_const_data (pidfile)); if (!_dbus_write_pid_file (pidfile, pid_to_write, error)) { _dbus_verbose ("pid file write failed\n"); _DBUS_ASSERT_ERROR_IS_SET(error); return FALSE; } } else { _dbus_verbose ("No pid file requested\n"); } if (print_pid_pipe != NULL && _dbus_pipe_is_valid (print_pid_pipe)) { DBusString pid; int bytes; _dbus_verbose ("writing our pid to pipe %d\n", print_pid_pipe->fd); if (!_dbus_string_init (&pid)) { _DBUS_SET_OOM (error); return FALSE; } if (!_dbus_string_append_int (&pid, pid_to_write) || !_dbus_string_append (&pid, "\n")) { _dbus_string_free (&pid); _DBUS_SET_OOM (error); return FALSE; } bytes = _dbus_string_get_length (&pid); if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes) { /* _dbus_pipe_write sets error only on failure, not short write */ if (error != NULL && !dbus_error_is_set(error)) { dbus_set_error (error, DBUS_ERROR_FAILED, "Printing message bus PID: did not write enough bytes\n"); } _dbus_string_free (&pid); return FALSE; } _dbus_string_free (&pid); } else { _dbus_verbose ("No pid pipe to write to\n"); } return TRUE; } /** * Verify that after the fork we can successfully change to this user. * * @param user the username given in the daemon configuration * @returns #TRUE if username is valid */ dbus_bool_t _dbus_verify_daemon_user (const char *user) { DBusString u; _dbus_string_init_const (&u, user); return _dbus_get_user_id_and_primary_group (&u, NULL, NULL); } /* The HAVE_LIBAUDIT case lives in selinux.c */ #ifndef HAVE_LIBAUDIT /** * Changes the user and group the bus is running as. * * @param user the user to become * @param error return location for errors * @returns #FALSE on failure */ dbus_bool_t _dbus_change_to_daemon_user (const char *user, DBusError *error) { dbus_uid_t uid; dbus_gid_t gid; DBusString u; _dbus_string_init_const (&u, user); if (!_dbus_get_user_id_and_primary_group (&u, &uid, &gid)) { dbus_set_error (error, DBUS_ERROR_FAILED, "User '%s' does not appear to exist?", user); return FALSE; } /* 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. * * 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; } #endif /* !HAVE_LIBAUDIT */ #ifdef HAVE_SETRLIMIT /* We assume that if we have setrlimit, we also have getrlimit and * struct rlimit. */ struct DBusRLimit { struct rlimit lim; }; DBusRLimit * _dbus_rlimit_save_fd_limit (DBusError *error) { DBusRLimit *self; self = dbus_new0 (DBusRLimit, 1); if (self == NULL) { _DBUS_SET_OOM (error); return NULL; } if (getrlimit (RLIMIT_NOFILE, &self->lim) < 0) { dbus_set_error (error, _dbus_error_from_errno (errno), "Failed to get fd limit: %s", _dbus_strerror (errno)); dbus_free (self); return NULL; } return self; } dbus_bool_t _dbus_rlimit_raise_fd_limit_if_privileged (unsigned int desired, DBusError *error) { struct rlimit lim; /* No point to doing this practically speaking * if we're not uid 0. We expect the system * bus to use this before we change UID, and * the session bus takes the Linux default, * currently 1024 for cur and 4096 for max. */ if (getuid () != 0) { /* not an error, we're probably the session bus */ return TRUE; } if (getrlimit (RLIMIT_NOFILE, &lim) < 0) { dbus_set_error (error, _dbus_error_from_errno (errno), "Failed to get fd limit: %s", _dbus_strerror (errno)); return FALSE; } if (lim.rlim_cur == RLIM_INFINITY || lim.rlim_cur >= desired) { /* not an error, everything is fine */ return TRUE; } /* Ignore "maximum limit", assume we have the "superuser" * privileges. On Linux this is CAP_SYS_RESOURCE. */ lim.rlim_cur = lim.rlim_max = desired; if (setrlimit (RLIMIT_NOFILE, &lim) < 0) { dbus_set_error (error, _dbus_error_from_errno (errno), "Failed to set fd limit to %u: %s", desired, _dbus_strerror (errno)); return FALSE; } return TRUE; } dbus_bool_t _dbus_rlimit_restore_fd_limit (DBusRLimit *saved, DBusError *error) { if (setrlimit (RLIMIT_NOFILE, &saved->lim) < 0) { dbus_set_error (error, _dbus_error_from_errno (errno), "Failed to restore old fd limit: %s", _dbus_strerror (errno)); return FALSE; } return TRUE; } #else /* !HAVE_SETRLIMIT */ static void fd_limit_not_supported (DBusError *error) { dbus_set_error (error, DBUS_ERROR_NOT_SUPPORTED, "cannot change fd limit on this platform"); } DBusRLimit * _dbus_rlimit_save_fd_limit (DBusError *error) { fd_limit_not_supported (error); return NULL; } dbus_bool_t _dbus_rlimit_raise_fd_limit_if_privileged (unsigned int desired, DBusError *error) { fd_limit_not_supported (error); return FALSE; } dbus_bool_t _dbus_rlimit_restore_fd_limit (DBusRLimit *saved, DBusError *error) { fd_limit_not_supported (error); return FALSE; } #endif void _dbus_rlimit_free (DBusRLimit *lim) { dbus_free (lim); } void _dbus_init_system_log (dbus_bool_t is_daemon) { #ifdef HAVE_SYSLOG_H int logopts = LOG_PID; #if HAVE_DECL_LOG_PERROR #ifdef HAVE_SYSTEMD if (!is_daemon || sd_booted () <= 0) #endif logopts |= LOG_PERROR; #endif openlog ("dbus", logopts, LOG_DAEMON); #endif } /** * Log a message to the system log file (e.g. syslog on Unix). * * @param severity a severity value * @param msg a printf-style format string */ void _dbus_system_log (DBusSystemLogSeverity severity, const char *msg, ...) { va_list args; va_start (args, msg); _dbus_system_logv (severity, msg, args); va_end (args); } /** * Log a message to the system log file (e.g. syslog on Unix). * * @param severity a severity value * @param msg a printf-style format string * @param args arguments for the format string * * If the FATAL severity is given, this function will terminate the program * with an error code. */ void _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args) { va_list tmp; #ifdef HAVE_SYSLOG_H int flags; switch (severity) { case DBUS_SYSTEM_LOG_INFO: flags = LOG_DAEMON | LOG_NOTICE; break; case DBUS_SYSTEM_LOG_WARNING: flags = LOG_DAEMON | LOG_WARNING; break; case DBUS_SYSTEM_LOG_SECURITY: flags = LOG_AUTH | LOG_NOTICE; break; case DBUS_SYSTEM_LOG_FATAL: flags = LOG_DAEMON|LOG_CRIT; break; default: return; } DBUS_VA_COPY (tmp, args); vsyslog (flags, msg, tmp); va_end (tmp); #endif #if !defined(HAVE_SYSLOG_H) || !HAVE_DECL_LOG_PERROR { /* vsyslog() won't write to stderr, so we'd better do it */ DBUS_VA_COPY (tmp, args); fprintf (stderr, "dbus[" DBUS_PID_FORMAT "]: ", _dbus_getpid ()); vfprintf (stderr, msg, tmp); fputc ('\n', stderr); va_end (tmp); } #endif if (severity == DBUS_SYSTEM_LOG_FATAL) exit (1); } /** 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); } /** 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 u, 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; } _dbus_string_init_const (&u, username); if (!_dbus_concat_dir_and_file (&f, &u)) { _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. * * This function is not re-entrant, and not necessarily thread-safe. * Only use it for test code or single-threaded utilities. * * @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; int err; _DBUS_ASSERT_ERROR_IS_CLEAR (error); again: errno = 0; ent = readdir (iter->d); if (!ent) { err = errno; if (err != 0) dbus_set_error (error, _dbus_error_from_errno (err), "%s", _dbus_strerror (err)); 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; size_t buflen; char *buf; struct group g_str; dbus_bool_t b; /* retrieve maximum needed size for buf */ buflen = sysconf (_SC_GETGR_R_SIZE_MAX); /* sysconf actually returns a long, but everything else expects size_t, * so just recast here. * https://bugs.freedesktop.org/show_bug.cgi?id=17061 */ if ((long) buflen <= 0) buflen = 1024; result = -1; while (1) { buf = dbus_malloc (buflen); if (buf == NULL) { dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); return FALSE; } g = NULL; #ifdef HAVE_POSIX_GETPWNAM_R if (group_c_str) result = getgrnam_r (group_c_str, &g_str, buf, buflen, &g); else result = getgrgid_r (gid, &g_str, buf, buflen, &g); #else g = getgrnam_r (group_c_str, &g_str, buf, buflen); result = 0; #endif /* !HAVE_POSIX_GETPWNAM_R */ /* Try a bigger buffer if ERANGE was returned: https://bugs.freedesktop.org/show_bug.cgi?id=16727 */ if (result == ERANGE && buflen < 512 * 1024) { dbus_free (buf); buflen *= 2; } else { break; } } if (result == 0 && g == &g_str) { b = fill_user_info_from_group (g, info, error); dbus_free (buf); return b; } 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 : "???"); dbus_free (buf); 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); } /** * Parse a UNIX user from the bus config file. On Windows, this should * simply always fail (just return #FALSE). * * @param username the username text * @param uid_p place to return the uid * @returns #TRUE on success */ dbus_bool_t _dbus_parse_unix_user_from_config (const DBusString *username, dbus_uid_t *uid_p) { return _dbus_get_user_id (username, uid_p); } /** * Parse a UNIX group from the bus config file. On Windows, this should * simply always fail (just return #FALSE). * * @param groupname the groupname text * @param gid_p place to return the gid * @returns #TRUE on success */ dbus_bool_t _dbus_parse_unix_group_from_config (const DBusString *groupname, dbus_gid_t *gid_p) { return _dbus_get_group_id (groupname, gid_p); } /** * Gets all groups corresponding to the given UNIX user ID. On UNIX, * just calls _dbus_groups_from_uid(). On Windows, should always * fail since we don't know any UNIX groups. * * @param uid the UID * @param group_ids return location for array of group IDs * @param n_group_ids return location for length of returned array * @returns #TRUE if the UID existed and we got some credentials */ dbus_bool_t _dbus_unix_groups_from_uid (dbus_uid_t uid, dbus_gid_t **group_ids, int *n_group_ids) { return _dbus_groups_from_uid (uid, group_ids, n_group_ids); } /** * Checks to see if the UNIX user ID is at the console. * Should always fail on Windows (set the error to * #DBUS_ERROR_NOT_SUPPORTED). * * @param uid UID of person to check * @param error return location for errors * @returns #TRUE if the UID is the same as the console user and there are no errors */ dbus_bool_t _dbus_unix_user_is_at_console (dbus_uid_t uid, DBusError *error) { return _dbus_is_console_user (uid, error); } /** * Checks to see if the UNIX user ID matches the UID of * the process. Should always return #FALSE on Windows. * * @param uid the UNIX user ID * @returns #TRUE if this uid owns the process. */ dbus_bool_t _dbus_unix_user_is_process_owner (dbus_uid_t uid) { return uid == _dbus_geteuid (); } /** * Checks to see if the Windows user SID matches the owner of * the process. Should always return #FALSE on UNIX. * * @param windows_sid the Windows user SID * @returns #TRUE if this user owns the process. */ dbus_bool_t _dbus_windows_user_is_process_owner (const char *windows_sid) { return FALSE; } /** @} */ /* 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 */ static void string_squash_nonprintable (DBusString *str) { unsigned char *buf; int i, len; buf = _dbus_string_get_data (str); len = _dbus_string_get_length (str); for (i = 0; i < len; i++) { unsigned char c = (unsigned char) buf[i]; if (c == '\0') buf[i] = ' '; else if (c < 0x20 || c > 127) buf[i] = '?'; } } /** * Get a printable string describing the command used to execute * the process with pid. This string should only be used for * informative purposes such as logging; it may not be trusted. * * The command is guaranteed to be printable ASCII and no longer * than max_len. * * @param pid Process id * @param str Append command to this string * @param max_len Maximum length of returned command * @param error return location for errors * @returns #FALSE on error */ dbus_bool_t _dbus_command_for_pid (unsigned long pid, DBusString *str, int max_len, DBusError *error) { /* This is all Linux-specific for now */ DBusString path; DBusString cmdline; int fd; if (!_dbus_string_init (&path)) { _DBUS_SET_OOM (error); return FALSE; } if (!_dbus_string_init (&cmdline)) { _DBUS_SET_OOM (error); _dbus_string_free (&path); return FALSE; } if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid)) goto oom; fd = open (_dbus_string_get_const_data (&path), O_RDONLY); if (fd < 0) { dbus_set_error (error, _dbus_error_from_errno (errno), "Failed to open \"%s\": %s", _dbus_string_get_const_data (&path), _dbus_strerror (errno)); goto fail; } if (!_dbus_read (fd, &cmdline, max_len)) { dbus_set_error (error, _dbus_error_from_errno (errno), "Failed to read from \"%s\": %s", _dbus_string_get_const_data (&path), _dbus_strerror (errno)); _dbus_close (fd, NULL); goto fail; } if (!_dbus_close (fd, error)) goto fail; string_squash_nonprintable (&cmdline); if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str))) goto oom; _dbus_string_free (&cmdline); _dbus_string_free (&path); return TRUE; oom: _DBUS_SET_OOM (error); fail: _dbus_string_free (&cmdline); _dbus_string_free (&path); return FALSE; } /* * replaces the term DBUS_PREFIX in configure_time_path by the * current dbus installation directory. On unix this function is a noop * * @param configure_time_path * @return real path */ const char * _dbus_replace_install_prefix (const char *configure_time_path) { return configure_time_path; } #define DBUS_UNIX_STANDARD_SESSION_SERVICEDIR "/dbus-1/services" #define DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR "/dbus-1/system-services" /** * Returns the standard directories for a session bus to look for service * activation files * * On UNIX this should be the standard xdg freedesktop.org data directories: * * XDG_DATA_HOME=${XDG_DATA_HOME-$HOME/.local/share} * XDG_DATA_DIRS=${XDG_DATA_DIRS-/usr/local/share:/usr/share} * * and * * DBUS_DATADIR * * @param dirs the directory list we are returning * @returns #FALSE on OOM */ dbus_bool_t _dbus_get_standard_session_servicedirs (DBusList **dirs) { const char *xdg_data_home; const char *xdg_data_dirs; DBusString servicedir_path; if (!_dbus_string_init (&servicedir_path)) return FALSE; xdg_data_home = _dbus_getenv ("XDG_DATA_HOME"); xdg_data_dirs = _dbus_getenv ("XDG_DATA_DIRS"); if (xdg_data_home != NULL) { if (!_dbus_string_append (&servicedir_path, xdg_data_home)) goto oom; } else { const DBusString *homedir; DBusString local_share; if (!_dbus_homedir_from_current_process (&homedir)) goto oom; if (!_dbus_string_append (&servicedir_path, _dbus_string_get_const_data (homedir))) goto oom; _dbus_string_init_const (&local_share, "/.local/share"); if (!_dbus_concat_dir_and_file (&servicedir_path, &local_share)) goto oom; } if (!_dbus_string_append (&servicedir_path, ":")) goto oom; if (xdg_data_dirs != NULL) { if (!_dbus_string_append (&servicedir_path, xdg_data_dirs)) goto oom; if (!_dbus_string_append (&servicedir_path, ":")) goto oom; } else { if (!_dbus_string_append (&servicedir_path, "/usr/local/share:/usr/share:")) goto oom; } /* * add configured datadir to defaults * this may be the same as an xdg dir * however the config parser should take * care of duplicates */ if (!_dbus_string_append (&servicedir_path, DBUS_DATADIR)) goto oom; if (!_dbus_split_paths_and_append (&servicedir_path, DBUS_UNIX_STANDARD_SESSION_SERVICEDIR, dirs)) goto oom; _dbus_string_free (&servicedir_path); return TRUE; oom: _dbus_string_free (&servicedir_path); return FALSE; } /** * Returns the standard directories for a system bus to look for service * activation files * * On UNIX this should be the standard xdg freedesktop.org data directories: * * XDG_DATA_DIRS=${XDG_DATA_DIRS-/usr/local/share:/usr/share} * * and * * DBUS_DATADIR * * On Windows there is no system bus and this function can return nothing. * * @param dirs the directory list we are returning * @returns #FALSE on OOM */ dbus_bool_t _dbus_get_standard_system_servicedirs (DBusList **dirs) { /* * DBUS_DATADIR may be the same as one of the standard directories. However, * the config parser should take care of the duplicates. * * Also, append /lib as counterpart of /usr/share on the root * directory (the root directory does not know /share), in order to * facilitate early boot system bus activation where /usr might not * be available. */ static const char standard_search_path[] = "/usr/local/share:" "/usr/share:" DBUS_DATADIR ":" "/lib"; DBusString servicedir_path; _dbus_string_init_const (&servicedir_path, standard_search_path); return _dbus_split_paths_and_append (&servicedir_path, DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR, dirs); } /** * Append the absolute path of the system.conf file * (there is no system bus on Windows so this can just * return FALSE and print a warning or something) * * @param str the string to append to * @returns #FALSE if no memory */ dbus_bool_t _dbus_append_system_config_file (DBusString *str) { return _dbus_string_append (str, DBUS_SYSTEM_CONFIG_FILE); } /** * Append the absolute path of the session.conf file. * * @param str the string to append to * @returns #FALSE if no memory */ dbus_bool_t _dbus_append_session_config_file (DBusString *str) { return _dbus_string_append (str, DBUS_SESSION_CONFIG_FILE); }