D-Bus 1.4.6
|
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 openlog ("dbus", LOG_PID, LOG_DAEMON); 00429 } 00438 void 00439 _dbus_system_log (DBusSystemLogSeverity severity, const char *msg, ...) 00440 { 00441 va_list args; 00442 00443 va_start (args, msg); 00444 00445 _dbus_system_logv (severity, msg, args); 00446 00447 va_end (args); 00448 } 00449 00460 void 00461 _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args) 00462 { 00463 int flags; 00464 switch (severity) 00465 { 00466 case DBUS_SYSTEM_LOG_INFO: 00467 flags = LOG_DAEMON | LOG_NOTICE; 00468 break; 00469 case DBUS_SYSTEM_LOG_SECURITY: 00470 flags = LOG_AUTH | LOG_NOTICE; 00471 break; 00472 case DBUS_SYSTEM_LOG_FATAL: 00473 flags = LOG_DAEMON|LOG_CRIT; 00474 break; 00475 default: 00476 return; 00477 } 00478 00479 vsyslog (flags, msg, args); 00480 00481 if (severity == DBUS_SYSTEM_LOG_FATAL) 00482 exit (1); 00483 } 00484 00490 void 00491 _dbus_set_signal_handler (int sig, 00492 DBusSignalHandler handler) 00493 { 00494 struct sigaction act; 00495 sigset_t empty_mask; 00496 00497 sigemptyset (&empty_mask); 00498 act.sa_handler = handler; 00499 act.sa_mask = empty_mask; 00500 act.sa_flags = 0; 00501 sigaction (sig, &act, NULL); 00502 } 00503 00509 dbus_bool_t 00510 _dbus_file_exists (const char *file) 00511 { 00512 return (access (file, F_OK) == 0); 00513 } 00514 00521 dbus_bool_t 00522 _dbus_user_at_console (const char *username, 00523 DBusError *error) 00524 { 00525 00526 DBusString f; 00527 dbus_bool_t result; 00528 00529 result = FALSE; 00530 if (!_dbus_string_init (&f)) 00531 { 00532 _DBUS_SET_OOM (error); 00533 return FALSE; 00534 } 00535 00536 if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR)) 00537 { 00538 _DBUS_SET_OOM (error); 00539 goto out; 00540 } 00541 00542 00543 if (!_dbus_string_append (&f, username)) 00544 { 00545 _DBUS_SET_OOM (error); 00546 goto out; 00547 } 00548 00549 result = _dbus_file_exists (_dbus_string_get_const_data (&f)); 00550 00551 out: 00552 _dbus_string_free (&f); 00553 00554 return result; 00555 } 00556 00557 00564 dbus_bool_t 00565 _dbus_path_is_absolute (const DBusString *filename) 00566 { 00567 if (_dbus_string_get_length (filename) > 0) 00568 return _dbus_string_get_byte (filename, 0) == '/'; 00569 else 00570 return FALSE; 00571 } 00572 00581 dbus_bool_t 00582 _dbus_stat (const DBusString *filename, 00583 DBusStat *statbuf, 00584 DBusError *error) 00585 { 00586 const char *filename_c; 00587 struct stat sb; 00588 00589 _DBUS_ASSERT_ERROR_IS_CLEAR (error); 00590 00591 filename_c = _dbus_string_get_const_data (filename); 00592 00593 if (stat (filename_c, &sb) < 0) 00594 { 00595 dbus_set_error (error, _dbus_error_from_errno (errno), 00596 "%s", _dbus_strerror (errno)); 00597 return FALSE; 00598 } 00599 00600 statbuf->mode = sb.st_mode; 00601 statbuf->nlink = sb.st_nlink; 00602 statbuf->uid = sb.st_uid; 00603 statbuf->gid = sb.st_gid; 00604 statbuf->size = sb.st_size; 00605 statbuf->atime = sb.st_atime; 00606 statbuf->mtime = sb.st_mtime; 00607 statbuf->ctime = sb.st_ctime; 00608 00609 return TRUE; 00610 } 00611 00612 00616 struct DBusDirIter 00617 { 00618 DIR *d; 00620 }; 00621 00629 DBusDirIter* 00630 _dbus_directory_open (const DBusString *filename, 00631 DBusError *error) 00632 { 00633 DIR *d; 00634 DBusDirIter *iter; 00635 const char *filename_c; 00636 00637 _DBUS_ASSERT_ERROR_IS_CLEAR (error); 00638 00639 filename_c = _dbus_string_get_const_data (filename); 00640 00641 d = opendir (filename_c); 00642 if (d == NULL) 00643 { 00644 dbus_set_error (error, _dbus_error_from_errno (errno), 00645 "Failed to read directory \"%s\": %s", 00646 filename_c, 00647 _dbus_strerror (errno)); 00648 return NULL; 00649 } 00650 iter = dbus_new0 (DBusDirIter, 1); 00651 if (iter == NULL) 00652 { 00653 closedir (d); 00654 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, 00655 "Could not allocate memory for directory iterator"); 00656 return NULL; 00657 } 00658 00659 iter->d = d; 00660 00661 return iter; 00662 } 00663 00677 dbus_bool_t 00678 _dbus_directory_get_next_file (DBusDirIter *iter, 00679 DBusString *filename, 00680 DBusError *error) 00681 { 00682 struct dirent *ent; 00683 int err; 00684 00685 _DBUS_ASSERT_ERROR_IS_CLEAR (error); 00686 00687 again: 00688 errno = 0; 00689 ent = readdir (iter->d); 00690 00691 if (!ent) 00692 { 00693 err = errno; 00694 00695 if (err != 0) 00696 dbus_set_error (error, 00697 _dbus_error_from_errno (err), 00698 "%s", _dbus_strerror (err)); 00699 00700 return FALSE; 00701 } 00702 else if (ent->d_name[0] == '.' && 00703 (ent->d_name[1] == '\0' || 00704 (ent->d_name[1] == '.' && ent->d_name[2] == '\0'))) 00705 goto again; 00706 else 00707 { 00708 _dbus_string_set_length (filename, 0); 00709 if (!_dbus_string_append (filename, ent->d_name)) 00710 { 00711 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, 00712 "No memory to read directory entry"); 00713 return FALSE; 00714 } 00715 else 00716 { 00717 return TRUE; 00718 } 00719 } 00720 } 00721 00725 void 00726 _dbus_directory_close (DBusDirIter *iter) 00727 { 00728 closedir (iter->d); 00729 dbus_free (iter); 00730 } 00731 00732 static dbus_bool_t 00733 fill_user_info_from_group (struct group *g, 00734 DBusGroupInfo *info, 00735 DBusError *error) 00736 { 00737 _dbus_assert (g->gr_name != NULL); 00738 00739 info->gid = g->gr_gid; 00740 info->groupname = _dbus_strdup (g->gr_name); 00741 00742 /* info->members = dbus_strdupv (g->gr_mem) */ 00743 00744 if (info->groupname == NULL) 00745 { 00746 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); 00747 return FALSE; 00748 } 00749 00750 return TRUE; 00751 } 00752 00753 static dbus_bool_t 00754 fill_group_info (DBusGroupInfo *info, 00755 dbus_gid_t gid, 00756 const DBusString *groupname, 00757 DBusError *error) 00758 { 00759 const char *group_c_str; 00760 00761 _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET); 00762 _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET); 00763 00764 if (groupname) 00765 group_c_str = _dbus_string_get_const_data (groupname); 00766 else 00767 group_c_str = NULL; 00768 00769 /* For now assuming that the getgrnam() and getgrgid() flavors 00770 * always correspond to the pwnam flavors, if not we have 00771 * to add more configure checks. 00772 */ 00773 00774 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R) 00775 { 00776 struct group *g; 00777 int result; 00778 size_t buflen; 00779 char *buf; 00780 struct group g_str; 00781 dbus_bool_t b; 00782 00783 /* retrieve maximum needed size for buf */ 00784 buflen = sysconf (_SC_GETGR_R_SIZE_MAX); 00785 00786 /* sysconf actually returns a long, but everything else expects size_t, 00787 * so just recast here. 00788 * https://bugs.freedesktop.org/show_bug.cgi?id=17061 00789 */ 00790 if ((long) buflen <= 0) 00791 buflen = 1024; 00792 00793 result = -1; 00794 while (1) 00795 { 00796 buf = dbus_malloc (buflen); 00797 if (buf == NULL) 00798 { 00799 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); 00800 return FALSE; 00801 } 00802 00803 g = NULL; 00804 #ifdef HAVE_POSIX_GETPWNAM_R 00805 if (group_c_str) 00806 result = getgrnam_r (group_c_str, &g_str, buf, buflen, 00807 &g); 00808 else 00809 result = getgrgid_r (gid, &g_str, buf, buflen, 00810 &g); 00811 #else 00812 g = getgrnam_r (group_c_str, &g_str, buf, buflen); 00813 result = 0; 00814 #endif /* !HAVE_POSIX_GETPWNAM_R */ 00815 /* Try a bigger buffer if ERANGE was returned: 00816 https://bugs.freedesktop.org/show_bug.cgi?id=16727 00817 */ 00818 if (result == ERANGE && buflen < 512 * 1024) 00819 { 00820 dbus_free (buf); 00821 buflen *= 2; 00822 } 00823 else 00824 { 00825 break; 00826 } 00827 } 00828 00829 if (result == 0 && g == &g_str) 00830 { 00831 b = fill_user_info_from_group (g, info, error); 00832 dbus_free (buf); 00833 return b; 00834 } 00835 else 00836 { 00837 dbus_set_error (error, _dbus_error_from_errno (errno), 00838 "Group %s unknown or failed to look it up\n", 00839 group_c_str ? group_c_str : "???"); 00840 dbus_free (buf); 00841 return FALSE; 00842 } 00843 } 00844 #else /* ! HAVE_GETPWNAM_R */ 00845 { 00846 /* I guess we're screwed on thread safety here */ 00847 struct group *g; 00848 00849 g = getgrnam (group_c_str); 00850 00851 if (g != NULL) 00852 { 00853 return fill_user_info_from_group (g, info, error); 00854 } 00855 else 00856 { 00857 dbus_set_error (error, _dbus_error_from_errno (errno), 00858 "Group %s unknown or failed to look it up\n", 00859 group_c_str ? group_c_str : "???"); 00860 return FALSE; 00861 } 00862 } 00863 #endif /* ! HAVE_GETPWNAM_R */ 00864 } 00865 00875 dbus_bool_t 00876 _dbus_group_info_fill (DBusGroupInfo *info, 00877 const DBusString *groupname, 00878 DBusError *error) 00879 { 00880 return fill_group_info (info, DBUS_GID_UNSET, 00881 groupname, error); 00882 00883 } 00884 00894 dbus_bool_t 00895 _dbus_group_info_fill_gid (DBusGroupInfo *info, 00896 dbus_gid_t gid, 00897 DBusError *error) 00898 { 00899 return fill_group_info (info, gid, NULL, error); 00900 } 00901 00910 dbus_bool_t 00911 _dbus_parse_unix_user_from_config (const DBusString *username, 00912 dbus_uid_t *uid_p) 00913 { 00914 return _dbus_get_user_id (username, uid_p); 00915 00916 } 00917 00926 dbus_bool_t 00927 _dbus_parse_unix_group_from_config (const DBusString *groupname, 00928 dbus_gid_t *gid_p) 00929 { 00930 return _dbus_get_group_id (groupname, gid_p); 00931 } 00932 00943 dbus_bool_t 00944 _dbus_unix_groups_from_uid (dbus_uid_t uid, 00945 dbus_gid_t **group_ids, 00946 int *n_group_ids) 00947 { 00948 return _dbus_groups_from_uid (uid, group_ids, n_group_ids); 00949 } 00950 00960 dbus_bool_t 00961 _dbus_unix_user_is_at_console (dbus_uid_t uid, 00962 DBusError *error) 00963 { 00964 return _dbus_is_console_user (uid, error); 00965 00966 } 00967 00975 dbus_bool_t 00976 _dbus_unix_user_is_process_owner (dbus_uid_t uid) 00977 { 00978 return uid == _dbus_geteuid (); 00979 } 00980 00988 dbus_bool_t 00989 _dbus_windows_user_is_process_owner (const char *windows_sid) 00990 { 00991 return FALSE; 00992 } 00993 /* End of DBusInternalsUtils functions */ 00995 01007 dbus_bool_t 01008 _dbus_string_get_dirname (const DBusString *filename, 01009 DBusString *dirname) 01010 { 01011 int sep; 01012 01013 _dbus_assert (filename != dirname); 01014 _dbus_assert (filename != NULL); 01015 _dbus_assert (dirname != NULL); 01016 01017 /* Ignore any separators on the end */ 01018 sep = _dbus_string_get_length (filename); 01019 if (sep == 0) 01020 return _dbus_string_append (dirname, "."); /* empty string passed in */ 01021 01022 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/') 01023 --sep; 01024 01025 _dbus_assert (sep >= 0); 01026 01027 if (sep == 0) 01028 return _dbus_string_append (dirname, "/"); 01029 01030 /* Now find the previous separator */ 01031 _dbus_string_find_byte_backward (filename, sep, '/', &sep); 01032 if (sep < 0) 01033 return _dbus_string_append (dirname, "."); 01034 01035 /* skip multiple separators */ 01036 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/') 01037 --sep; 01038 01039 _dbus_assert (sep >= 0); 01040 01041 if (sep == 0 && 01042 _dbus_string_get_byte (filename, 0) == '/') 01043 return _dbus_string_append (dirname, "/"); 01044 else 01045 return _dbus_string_copy_len (filename, 0, sep - 0, 01046 dirname, _dbus_string_get_length (dirname)); 01047 } /* DBusString stuff */ 01049 01050 static void 01051 string_squash_nonprintable (DBusString *str) 01052 { 01053 unsigned char *buf; 01054 int i, len; 01055 01056 buf = _dbus_string_get_data (str); 01057 len = _dbus_string_get_length (str); 01058 01059 for (i = 0; i < len; i++) 01060 { 01061 unsigned char c = (unsigned char) buf[i]; 01062 if (c == '\0') 01063 buf[i] = ' '; 01064 else if (c < 0x20 || c > 127) 01065 buf[i] = '?'; 01066 } 01067 } 01068 01083 dbus_bool_t 01084 _dbus_command_for_pid (unsigned long pid, 01085 DBusString *str, 01086 int max_len, 01087 DBusError *error) 01088 { 01089 /* This is all Linux-specific for now */ 01090 DBusString path; 01091 DBusString cmdline; 01092 int fd; 01093 01094 if (!_dbus_string_init (&path)) 01095 { 01096 _DBUS_SET_OOM (error); 01097 return FALSE; 01098 } 01099 01100 if (!_dbus_string_init (&cmdline)) 01101 { 01102 _DBUS_SET_OOM (error); 01103 _dbus_string_free (&path); 01104 return FALSE; 01105 } 01106 01107 if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid)) 01108 goto oom; 01109 01110 fd = open (_dbus_string_get_const_data (&path), O_RDONLY); 01111 if (fd < 0) 01112 { 01113 dbus_set_error (error, 01114 _dbus_error_from_errno (errno), 01115 "Failed to open \"%s\": %s", 01116 _dbus_string_get_const_data (&path), 01117 _dbus_strerror (errno)); 01118 goto fail; 01119 } 01120 01121 if (!_dbus_read (fd, &cmdline, max_len)) 01122 { 01123 dbus_set_error (error, 01124 _dbus_error_from_errno (errno), 01125 "Failed to read from \"%s\": %s", 01126 _dbus_string_get_const_data (&path), 01127 _dbus_strerror (errno)); 01128 goto fail; 01129 } 01130 01131 if (!_dbus_close (fd, error)) 01132 goto fail; 01133 01134 string_squash_nonprintable (&cmdline); 01135 01136 if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str))) 01137 goto oom; 01138 01139 _dbus_string_free (&cmdline); 01140 _dbus_string_free (&path); 01141 return TRUE; 01142 oom: 01143 _DBUS_SET_OOM (error); 01144 fail: 01145 _dbus_string_free (&cmdline); 01146 _dbus_string_free (&path); 01147 return FALSE; 01148 }