D-Bus
1.6.8
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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 %d\n", 00258 print_pid_pipe->fd); 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 00393 /* No point to doing this practically speaking 00394 * if we're not uid 0. We expect the system 00395 * bus to use this before we change UID, and 00396 * the session bus takes the Linux default 00397 * of 1024 for both cur and max. 00398 */ 00399 if (getuid () != 0) 00400 return; 00401 00402 if (getrlimit (RLIMIT_NOFILE, &lim) < 0) 00403 return; 00404 00405 if (lim.rlim_cur >= limit) 00406 return; 00407 00408 /* Ignore "maximum limit", assume we have the "superuser" 00409 * privileges. On Linux this is CAP_SYS_RESOURCE. 00410 */ 00411 target_lim.rlim_cur = target_lim.rlim_max = limit; 00412 /* Also ignore errors; if we fail, we will at least work 00413 * up to whatever limit we had, which seems better than 00414 * just outright aborting. 00415 * 00416 * However, in the future we should probably log this so OS builders 00417 * have a chance to notice any misconfiguration like dbus-daemon 00418 * being started without CAP_SYS_RESOURCE. 00419 */ 00420 setrlimit (RLIMIT_NOFILE, &target_lim); 00421 #endif 00422 } 00423 00424 void 00425 _dbus_init_system_log (void) 00426 { 00427 #if HAVE_DECL_LOG_PERROR 00428 openlog ("dbus", LOG_PID | LOG_PERROR, LOG_DAEMON); 00429 #else 00430 openlog ("dbus", LOG_PID, LOG_DAEMON); 00431 #endif 00432 } 00433 00442 void 00443 _dbus_system_log (DBusSystemLogSeverity severity, const char *msg, ...) 00444 { 00445 va_list args; 00446 00447 va_start (args, msg); 00448 00449 _dbus_system_logv (severity, msg, args); 00450 00451 va_end (args); 00452 } 00453 00464 void 00465 _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args) 00466 { 00467 int flags; 00468 switch (severity) 00469 { 00470 case DBUS_SYSTEM_LOG_INFO: 00471 flags = LOG_DAEMON | LOG_NOTICE; 00472 break; 00473 case DBUS_SYSTEM_LOG_SECURITY: 00474 flags = LOG_AUTH | LOG_NOTICE; 00475 break; 00476 case DBUS_SYSTEM_LOG_FATAL: 00477 flags = LOG_DAEMON|LOG_CRIT; 00478 break; 00479 default: 00480 return; 00481 } 00482 00483 #ifndef HAVE_DECL_LOG_PERROR 00484 { 00485 /* vsyslog() won't write to stderr, so we'd better do it */ 00486 va_list tmp; 00487 00488 DBUS_VA_COPY (tmp, args); 00489 fprintf (stderr, "dbus[" DBUS_PID_FORMAT "]: ", _dbus_getpid ()); 00490 vfprintf (stderr, msg, tmp); 00491 fputc ('\n', stderr); 00492 va_end (tmp); 00493 } 00494 #endif 00495 00496 vsyslog (flags, msg, args); 00497 00498 if (severity == DBUS_SYSTEM_LOG_FATAL) 00499 exit (1); 00500 } 00501 00507 void 00508 _dbus_set_signal_handler (int sig, 00509 DBusSignalHandler handler) 00510 { 00511 struct sigaction act; 00512 sigset_t empty_mask; 00513 00514 sigemptyset (&empty_mask); 00515 act.sa_handler = handler; 00516 act.sa_mask = empty_mask; 00517 act.sa_flags = 0; 00518 sigaction (sig, &act, NULL); 00519 } 00520 00526 dbus_bool_t 00527 _dbus_file_exists (const char *file) 00528 { 00529 return (access (file, F_OK) == 0); 00530 } 00531 00538 dbus_bool_t 00539 _dbus_user_at_console (const char *username, 00540 DBusError *error) 00541 { 00542 00543 DBusString u, f; 00544 dbus_bool_t result; 00545 00546 result = FALSE; 00547 if (!_dbus_string_init (&f)) 00548 { 00549 _DBUS_SET_OOM (error); 00550 return FALSE; 00551 } 00552 00553 if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR)) 00554 { 00555 _DBUS_SET_OOM (error); 00556 goto out; 00557 } 00558 00559 _dbus_string_init_const (&u, username); 00560 00561 if (!_dbus_concat_dir_and_file (&f, &u)) 00562 { 00563 _DBUS_SET_OOM (error); 00564 goto out; 00565 } 00566 00567 result = _dbus_file_exists (_dbus_string_get_const_data (&f)); 00568 00569 out: 00570 _dbus_string_free (&f); 00571 00572 return result; 00573 } 00574 00575 00582 dbus_bool_t 00583 _dbus_path_is_absolute (const DBusString *filename) 00584 { 00585 if (_dbus_string_get_length (filename) > 0) 00586 return _dbus_string_get_byte (filename, 0) == '/'; 00587 else 00588 return FALSE; 00589 } 00590 00599 dbus_bool_t 00600 _dbus_stat (const DBusString *filename, 00601 DBusStat *statbuf, 00602 DBusError *error) 00603 { 00604 const char *filename_c; 00605 struct stat sb; 00606 00607 _DBUS_ASSERT_ERROR_IS_CLEAR (error); 00608 00609 filename_c = _dbus_string_get_const_data (filename); 00610 00611 if (stat (filename_c, &sb) < 0) 00612 { 00613 dbus_set_error (error, _dbus_error_from_errno (errno), 00614 "%s", _dbus_strerror (errno)); 00615 return FALSE; 00616 } 00617 00618 statbuf->mode = sb.st_mode; 00619 statbuf->nlink = sb.st_nlink; 00620 statbuf->uid = sb.st_uid; 00621 statbuf->gid = sb.st_gid; 00622 statbuf->size = sb.st_size; 00623 statbuf->atime = sb.st_atime; 00624 statbuf->mtime = sb.st_mtime; 00625 statbuf->ctime = sb.st_ctime; 00626 00627 return TRUE; 00628 } 00629 00630 00634 struct DBusDirIter 00635 { 00636 DIR *d; 00638 }; 00639 00647 DBusDirIter* 00648 _dbus_directory_open (const DBusString *filename, 00649 DBusError *error) 00650 { 00651 DIR *d; 00652 DBusDirIter *iter; 00653 const char *filename_c; 00654 00655 _DBUS_ASSERT_ERROR_IS_CLEAR (error); 00656 00657 filename_c = _dbus_string_get_const_data (filename); 00658 00659 d = opendir (filename_c); 00660 if (d == NULL) 00661 { 00662 dbus_set_error (error, _dbus_error_from_errno (errno), 00663 "Failed to read directory \"%s\": %s", 00664 filename_c, 00665 _dbus_strerror (errno)); 00666 return NULL; 00667 } 00668 iter = dbus_new0 (DBusDirIter, 1); 00669 if (iter == NULL) 00670 { 00671 closedir (d); 00672 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, 00673 "Could not allocate memory for directory iterator"); 00674 return NULL; 00675 } 00676 00677 iter->d = d; 00678 00679 return iter; 00680 } 00681 00695 dbus_bool_t 00696 _dbus_directory_get_next_file (DBusDirIter *iter, 00697 DBusString *filename, 00698 DBusError *error) 00699 { 00700 struct dirent *ent; 00701 int err; 00702 00703 _DBUS_ASSERT_ERROR_IS_CLEAR (error); 00704 00705 again: 00706 errno = 0; 00707 ent = readdir (iter->d); 00708 00709 if (!ent) 00710 { 00711 err = errno; 00712 00713 if (err != 0) 00714 dbus_set_error (error, 00715 _dbus_error_from_errno (err), 00716 "%s", _dbus_strerror (err)); 00717 00718 return FALSE; 00719 } 00720 else if (ent->d_name[0] == '.' && 00721 (ent->d_name[1] == '\0' || 00722 (ent->d_name[1] == '.' && ent->d_name[2] == '\0'))) 00723 goto again; 00724 else 00725 { 00726 _dbus_string_set_length (filename, 0); 00727 if (!_dbus_string_append (filename, ent->d_name)) 00728 { 00729 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, 00730 "No memory to read directory entry"); 00731 return FALSE; 00732 } 00733 else 00734 { 00735 return TRUE; 00736 } 00737 } 00738 } 00739 00743 void 00744 _dbus_directory_close (DBusDirIter *iter) 00745 { 00746 closedir (iter->d); 00747 dbus_free (iter); 00748 } 00749 00750 static dbus_bool_t 00751 fill_user_info_from_group (struct group *g, 00752 DBusGroupInfo *info, 00753 DBusError *error) 00754 { 00755 _dbus_assert (g->gr_name != NULL); 00756 00757 info->gid = g->gr_gid; 00758 info->groupname = _dbus_strdup (g->gr_name); 00759 00760 /* info->members = dbus_strdupv (g->gr_mem) */ 00761 00762 if (info->groupname == NULL) 00763 { 00764 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); 00765 return FALSE; 00766 } 00767 00768 return TRUE; 00769 } 00770 00771 static dbus_bool_t 00772 fill_group_info (DBusGroupInfo *info, 00773 dbus_gid_t gid, 00774 const DBusString *groupname, 00775 DBusError *error) 00776 { 00777 const char *group_c_str; 00778 00779 _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET); 00780 _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET); 00781 00782 if (groupname) 00783 group_c_str = _dbus_string_get_const_data (groupname); 00784 else 00785 group_c_str = NULL; 00786 00787 /* For now assuming that the getgrnam() and getgrgid() flavors 00788 * always correspond to the pwnam flavors, if not we have 00789 * to add more configure checks. 00790 */ 00791 00792 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R) 00793 { 00794 struct group *g; 00795 int result; 00796 size_t buflen; 00797 char *buf; 00798 struct group g_str; 00799 dbus_bool_t b; 00800 00801 /* retrieve maximum needed size for buf */ 00802 buflen = sysconf (_SC_GETGR_R_SIZE_MAX); 00803 00804 /* sysconf actually returns a long, but everything else expects size_t, 00805 * so just recast here. 00806 * https://bugs.freedesktop.org/show_bug.cgi?id=17061 00807 */ 00808 if ((long) buflen <= 0) 00809 buflen = 1024; 00810 00811 result = -1; 00812 while (1) 00813 { 00814 buf = dbus_malloc (buflen); 00815 if (buf == NULL) 00816 { 00817 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL); 00818 return FALSE; 00819 } 00820 00821 g = NULL; 00822 #ifdef HAVE_POSIX_GETPWNAM_R 00823 if (group_c_str) 00824 result = getgrnam_r (group_c_str, &g_str, buf, buflen, 00825 &g); 00826 else 00827 result = getgrgid_r (gid, &g_str, buf, buflen, 00828 &g); 00829 #else 00830 g = getgrnam_r (group_c_str, &g_str, buf, buflen); 00831 result = 0; 00832 #endif /* !HAVE_POSIX_GETPWNAM_R */ 00833 /* Try a bigger buffer if ERANGE was returned: 00834 https://bugs.freedesktop.org/show_bug.cgi?id=16727 00835 */ 00836 if (result == ERANGE && buflen < 512 * 1024) 00837 { 00838 dbus_free (buf); 00839 buflen *= 2; 00840 } 00841 else 00842 { 00843 break; 00844 } 00845 } 00846 00847 if (result == 0 && g == &g_str) 00848 { 00849 b = fill_user_info_from_group (g, info, error); 00850 dbus_free (buf); 00851 return b; 00852 } 00853 else 00854 { 00855 dbus_set_error (error, _dbus_error_from_errno (errno), 00856 "Group %s unknown or failed to look it up\n", 00857 group_c_str ? group_c_str : "???"); 00858 dbus_free (buf); 00859 return FALSE; 00860 } 00861 } 00862 #else /* ! HAVE_GETPWNAM_R */ 00863 { 00864 /* I guess we're screwed on thread safety here */ 00865 struct group *g; 00866 00867 g = getgrnam (group_c_str); 00868 00869 if (g != NULL) 00870 { 00871 return fill_user_info_from_group (g, info, error); 00872 } 00873 else 00874 { 00875 dbus_set_error (error, _dbus_error_from_errno (errno), 00876 "Group %s unknown or failed to look it up\n", 00877 group_c_str ? group_c_str : "???"); 00878 return FALSE; 00879 } 00880 } 00881 #endif /* ! HAVE_GETPWNAM_R */ 00882 } 00883 00893 dbus_bool_t 00894 _dbus_group_info_fill (DBusGroupInfo *info, 00895 const DBusString *groupname, 00896 DBusError *error) 00897 { 00898 return fill_group_info (info, DBUS_GID_UNSET, 00899 groupname, error); 00900 00901 } 00902 00912 dbus_bool_t 00913 _dbus_group_info_fill_gid (DBusGroupInfo *info, 00914 dbus_gid_t gid, 00915 DBusError *error) 00916 { 00917 return fill_group_info (info, gid, NULL, error); 00918 } 00919 00928 dbus_bool_t 00929 _dbus_parse_unix_user_from_config (const DBusString *username, 00930 dbus_uid_t *uid_p) 00931 { 00932 return _dbus_get_user_id (username, uid_p); 00933 00934 } 00935 00944 dbus_bool_t 00945 _dbus_parse_unix_group_from_config (const DBusString *groupname, 00946 dbus_gid_t *gid_p) 00947 { 00948 return _dbus_get_group_id (groupname, gid_p); 00949 } 00950 00961 dbus_bool_t 00962 _dbus_unix_groups_from_uid (dbus_uid_t uid, 00963 dbus_gid_t **group_ids, 00964 int *n_group_ids) 00965 { 00966 return _dbus_groups_from_uid (uid, group_ids, n_group_ids); 00967 } 00968 00978 dbus_bool_t 00979 _dbus_unix_user_is_at_console (dbus_uid_t uid, 00980 DBusError *error) 00981 { 00982 return _dbus_is_console_user (uid, error); 00983 00984 } 00985 00993 dbus_bool_t 00994 _dbus_unix_user_is_process_owner (dbus_uid_t uid) 00995 { 00996 return uid == _dbus_geteuid (); 00997 } 00998 01006 dbus_bool_t 01007 _dbus_windows_user_is_process_owner (const char *windows_sid) 01008 { 01009 return FALSE; 01010 } 01011 /* End of DBusInternalsUtils functions */ 01013 01025 dbus_bool_t 01026 _dbus_string_get_dirname (const DBusString *filename, 01027 DBusString *dirname) 01028 { 01029 int sep; 01030 01031 _dbus_assert (filename != dirname); 01032 _dbus_assert (filename != NULL); 01033 _dbus_assert (dirname != NULL); 01034 01035 /* Ignore any separators on the end */ 01036 sep = _dbus_string_get_length (filename); 01037 if (sep == 0) 01038 return _dbus_string_append (dirname, "."); /* empty string passed in */ 01039 01040 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/') 01041 --sep; 01042 01043 _dbus_assert (sep >= 0); 01044 01045 if (sep == 0) 01046 return _dbus_string_append (dirname, "/"); 01047 01048 /* Now find the previous separator */ 01049 _dbus_string_find_byte_backward (filename, sep, '/', &sep); 01050 if (sep < 0) 01051 return _dbus_string_append (dirname, "."); 01052 01053 /* skip multiple separators */ 01054 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/') 01055 --sep; 01056 01057 _dbus_assert (sep >= 0); 01058 01059 if (sep == 0 && 01060 _dbus_string_get_byte (filename, 0) == '/') 01061 return _dbus_string_append (dirname, "/"); 01062 else 01063 return _dbus_string_copy_len (filename, 0, sep - 0, 01064 dirname, _dbus_string_get_length (dirname)); 01065 } /* DBusString stuff */ 01067 01068 static void 01069 string_squash_nonprintable (DBusString *str) 01070 { 01071 unsigned char *buf; 01072 int i, len; 01073 01074 buf = _dbus_string_get_data (str); 01075 len = _dbus_string_get_length (str); 01076 01077 for (i = 0; i < len; i++) 01078 { 01079 unsigned char c = (unsigned char) buf[i]; 01080 if (c == '\0') 01081 buf[i] = ' '; 01082 else if (c < 0x20 || c > 127) 01083 buf[i] = '?'; 01084 } 01085 } 01086 01101 dbus_bool_t 01102 _dbus_command_for_pid (unsigned long pid, 01103 DBusString *str, 01104 int max_len, 01105 DBusError *error) 01106 { 01107 /* This is all Linux-specific for now */ 01108 DBusString path; 01109 DBusString cmdline; 01110 int fd; 01111 01112 if (!_dbus_string_init (&path)) 01113 { 01114 _DBUS_SET_OOM (error); 01115 return FALSE; 01116 } 01117 01118 if (!_dbus_string_init (&cmdline)) 01119 { 01120 _DBUS_SET_OOM (error); 01121 _dbus_string_free (&path); 01122 return FALSE; 01123 } 01124 01125 if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid)) 01126 goto oom; 01127 01128 fd = open (_dbus_string_get_const_data (&path), O_RDONLY); 01129 if (fd < 0) 01130 { 01131 dbus_set_error (error, 01132 _dbus_error_from_errno (errno), 01133 "Failed to open \"%s\": %s", 01134 _dbus_string_get_const_data (&path), 01135 _dbus_strerror (errno)); 01136 goto fail; 01137 } 01138 01139 if (!_dbus_read (fd, &cmdline, max_len)) 01140 { 01141 dbus_set_error (error, 01142 _dbus_error_from_errno (errno), 01143 "Failed to read from \"%s\": %s", 01144 _dbus_string_get_const_data (&path), 01145 _dbus_strerror (errno)); 01146 goto fail; 01147 } 01148 01149 if (!_dbus_close (fd, error)) 01150 goto fail; 01151 01152 string_squash_nonprintable (&cmdline); 01153 01154 if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str))) 01155 goto oom; 01156 01157 _dbus_string_free (&cmdline); 01158 _dbus_string_free (&path); 01159 return TRUE; 01160 oom: 01161 _DBUS_SET_OOM (error); 01162 fail: 01163 _dbus_string_free (&cmdline); 01164 _dbus_string_free (&path); 01165 return FALSE; 01166 }