00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022
00023
00024 #include "dbus-sysdeps.h"
00025 #include "dbus-sysdeps-unix.h"
00026 #include "dbus-internals.h"
00027 #include "dbus-protocol.h"
00028 #include "dbus-string.h"
00029 #define DBUS_USERDB_INCLUDES_PRIVATE 1
00030 #include "dbus-userdb.h"
00031 #include "dbus-test.h"
00032
00033 #include <sys/types.h>
00034 #include <stdlib.h>
00035 #include <string.h>
00036 #include <signal.h>
00037 #include <unistd.h>
00038 #include <stdio.h>
00039 #include <errno.h>
00040 #include <fcntl.h>
00041 #include <sys/stat.h>
00042 #include <grp.h>
00043 #include <sys/socket.h>
00044 #include <dirent.h>
00045 #include <sys/un.h>
00046 #include <syslog.h>
00047
00048 #ifdef HAVE_SYS_SYSLIMITS_H
00049 #include <sys/syslimits.h>
00050 #endif
00051
00052 #ifndef O_BINARY
00053 #define O_BINARY 0
00054 #endif
00055
00071 dbus_bool_t
00072 _dbus_become_daemon (const DBusString *pidfile,
00073 DBusPipe *print_pid_pipe,
00074 DBusError *error,
00075 dbus_bool_t keep_umask)
00076 {
00077 const char *s;
00078 pid_t child_pid;
00079 int dev_null_fd;
00080
00081 _dbus_verbose ("Becoming a daemon...\n");
00082
00083 _dbus_verbose ("chdir to /\n");
00084 if (chdir ("/") < 0)
00085 {
00086 dbus_set_error (error, DBUS_ERROR_FAILED,
00087 "Could not chdir() to root directory");
00088 return FALSE;
00089 }
00090
00091 _dbus_verbose ("forking...\n");
00092 switch ((child_pid = fork ()))
00093 {
00094 case -1:
00095 _dbus_verbose ("fork failed\n");
00096 dbus_set_error (error, _dbus_error_from_errno (errno),
00097 "Failed to fork daemon: %s", _dbus_strerror (errno));
00098 return FALSE;
00099 break;
00100
00101 case 0:
00102 _dbus_verbose ("in child, closing std file descriptors\n");
00103
00104
00105
00106
00107
00108
00109 dev_null_fd = open ("/dev/null", O_RDWR);
00110 if (dev_null_fd >= 0)
00111 {
00112 dup2 (dev_null_fd, 0);
00113 dup2 (dev_null_fd, 1);
00114
00115 s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
00116 if (s == NULL || *s == '\0')
00117 dup2 (dev_null_fd, 2);
00118 else
00119 _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
00120 }
00121
00122 if (!keep_umask)
00123 {
00124
00125 _dbus_verbose ("setting umask\n");
00126 umask (022);
00127 }
00128
00129 _dbus_verbose ("calling setsid()\n");
00130 if (setsid () == -1)
00131 _dbus_assert_not_reached ("setsid() failed");
00132
00133 break;
00134
00135 default:
00136 if (!_dbus_write_pid_to_file_and_pipe (pidfile, print_pid_pipe,
00137 child_pid, error))
00138 {
00139 _dbus_verbose ("pid file or pipe write failed: %s\n",
00140 error->message);
00141 kill (child_pid, SIGTERM);
00142 return FALSE;
00143 }
00144
00145 _dbus_verbose ("parent exiting\n");
00146 _exit (0);
00147 break;
00148 }
00149
00150 return TRUE;
00151 }
00152
00153
00162 static dbus_bool_t
00163 _dbus_write_pid_file (const DBusString *filename,
00164 unsigned long pid,
00165 DBusError *error)
00166 {
00167 const char *cfilename;
00168 int fd;
00169 FILE *f;
00170
00171 cfilename = _dbus_string_get_const_data (filename);
00172
00173 fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
00174
00175 if (fd < 0)
00176 {
00177 dbus_set_error (error, _dbus_error_from_errno (errno),
00178 "Failed to open \"%s\": %s", cfilename,
00179 _dbus_strerror (errno));
00180 return FALSE;
00181 }
00182
00183 if ((f = fdopen (fd, "w")) == NULL)
00184 {
00185 dbus_set_error (error, _dbus_error_from_errno (errno),
00186 "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
00187 _dbus_close (fd, NULL);
00188 return FALSE;
00189 }
00190
00191 if (fprintf (f, "%lu\n", pid) < 0)
00192 {
00193 dbus_set_error (error, _dbus_error_from_errno (errno),
00194 "Failed to write to \"%s\": %s", cfilename,
00195 _dbus_strerror (errno));
00196
00197 fclose (f);
00198 return FALSE;
00199 }
00200
00201 if (fclose (f) == EOF)
00202 {
00203 dbus_set_error (error, _dbus_error_from_errno (errno),
00204 "Failed to close \"%s\": %s", cfilename,
00205 _dbus_strerror (errno));
00206 return FALSE;
00207 }
00208
00209 return TRUE;
00210 }
00211
00223 dbus_bool_t
00224 _dbus_write_pid_to_file_and_pipe (const DBusString *pidfile,
00225 DBusPipe *print_pid_pipe,
00226 dbus_pid_t pid_to_write,
00227 DBusError *error)
00228 {
00229 if (pidfile)
00230 {
00231 _dbus_verbose ("writing pid file %s\n", _dbus_string_get_const_data (pidfile));
00232 if (!_dbus_write_pid_file (pidfile,
00233 pid_to_write,
00234 error))
00235 {
00236 _dbus_verbose ("pid file write failed\n");
00237 _DBUS_ASSERT_ERROR_IS_SET(error);
00238 return FALSE;
00239 }
00240 }
00241 else
00242 {
00243 _dbus_verbose ("No pid file requested\n");
00244 }
00245
00246 if (print_pid_pipe != NULL && _dbus_pipe_is_valid (print_pid_pipe))
00247 {
00248 DBusString pid;
00249 int bytes;
00250
00251 _dbus_verbose ("writing our pid to pipe %d\n", print_pid_pipe->fd_or_handle);
00252
00253 if (!_dbus_string_init (&pid))
00254 {
00255 _DBUS_SET_OOM (error);
00256 return FALSE;
00257 }
00258
00259 if (!_dbus_string_append_int (&pid, pid_to_write) ||
00260 !_dbus_string_append (&pid, "\n"))
00261 {
00262 _dbus_string_free (&pid);
00263 _DBUS_SET_OOM (error);
00264 return FALSE;
00265 }
00266
00267 bytes = _dbus_string_get_length (&pid);
00268 if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
00269 {
00270
00271 if (error != NULL && !dbus_error_is_set(error))
00272 {
00273 dbus_set_error (error, DBUS_ERROR_FAILED,
00274 "Printing message bus PID: did not write enough bytes\n");
00275 }
00276 _dbus_string_free (&pid);
00277 return FALSE;
00278 }
00279
00280 _dbus_string_free (&pid);
00281 }
00282 else
00283 {
00284 _dbus_verbose ("No pid pipe to write to\n");
00285 }
00286
00287 return TRUE;
00288 }
00289
00296 dbus_bool_t
00297 _dbus_verify_daemon_user (const char *user)
00298 {
00299 DBusString u;
00300
00301 _dbus_string_init_const (&u, user);
00302
00303 return _dbus_get_user_id_and_primary_group (&u, NULL, NULL);
00304 }
00305
00306
00307
00308 #ifndef HAVE_LIBAUDIT
00309
00316 dbus_bool_t
00317 _dbus_change_to_daemon_user (const char *user,
00318 DBusError *error)
00319 {
00320 dbus_uid_t uid;
00321 dbus_gid_t gid;
00322 DBusString u;
00323
00324 _dbus_string_init_const (&u, user);
00325
00326 if (!_dbus_get_user_id_and_primary_group (&u, &uid, &gid))
00327 {
00328 dbus_set_error (error, DBUS_ERROR_FAILED,
00329 "User '%s' does not appear to exist?",
00330 user);
00331 return FALSE;
00332 }
00333
00334
00335
00336
00337
00338
00339
00340
00341 if (setgroups (0, NULL) < 0)
00342 _dbus_warn ("Failed to drop supplementary groups: %s\n",
00343 _dbus_strerror (errno));
00344
00345
00346
00347
00348 if (setgid (gid) < 0)
00349 {
00350 dbus_set_error (error, _dbus_error_from_errno (errno),
00351 "Failed to set GID to %lu: %s", gid,
00352 _dbus_strerror (errno));
00353 return FALSE;
00354 }
00355
00356 if (setuid (uid) < 0)
00357 {
00358 dbus_set_error (error, _dbus_error_from_errno (errno),
00359 "Failed to set UID to %lu: %s", uid,
00360 _dbus_strerror (errno));
00361 return FALSE;
00362 }
00363
00364 return TRUE;
00365 }
00366 #endif
00367
00368 void
00369 _dbus_init_system_log (void)
00370 {
00371 openlog ("dbus", LOG_PID, LOG_DAEMON);
00372 }
00381 void
00382 _dbus_system_log (DBusSystemLogSeverity severity, const char *msg, ...)
00383 {
00384 va_list args;
00385
00386 va_start (args, msg);
00387
00388 _dbus_system_logv (severity, msg, args);
00389
00390 va_end (args);
00391 }
00392
00403 void
00404 _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args)
00405 {
00406 int flags;
00407 switch (severity)
00408 {
00409 case DBUS_SYSTEM_LOG_INFO:
00410 flags = LOG_DAEMON | LOG_NOTICE;
00411 break;
00412 case DBUS_SYSTEM_LOG_SECURITY:
00413 flags = LOG_AUTH | LOG_NOTICE;
00414 break;
00415 case DBUS_SYSTEM_LOG_FATAL:
00416 flags = LOG_DAEMON|LOG_CRIT;
00417 default:
00418 return;
00419 }
00420
00421 vsyslog (flags, msg, args);
00422
00423 if (severity == DBUS_SYSTEM_LOG_FATAL)
00424 exit (1);
00425 }
00426
00432 void
00433 _dbus_set_signal_handler (int sig,
00434 DBusSignalHandler handler)
00435 {
00436 struct sigaction act;
00437 sigset_t empty_mask;
00438
00439 sigemptyset (&empty_mask);
00440 act.sa_handler = handler;
00441 act.sa_mask = empty_mask;
00442 act.sa_flags = 0;
00443 sigaction (sig, &act, NULL);
00444 }
00445
00446
00454 dbus_bool_t
00455 _dbus_delete_directory (const DBusString *filename,
00456 DBusError *error)
00457 {
00458 const char *filename_c;
00459
00460 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00461
00462 filename_c = _dbus_string_get_const_data (filename);
00463
00464 if (rmdir (filename_c) != 0)
00465 {
00466 dbus_set_error (error, DBUS_ERROR_FAILED,
00467 "Failed to remove directory %s: %s\n",
00468 filename_c, _dbus_strerror (errno));
00469 return FALSE;
00470 }
00471
00472 return TRUE;
00473 }
00474
00480 dbus_bool_t
00481 _dbus_file_exists (const char *file)
00482 {
00483 return (access (file, F_OK) == 0);
00484 }
00485
00492 dbus_bool_t
00493 _dbus_user_at_console (const char *username,
00494 DBusError *error)
00495 {
00496
00497 DBusString f;
00498 dbus_bool_t result;
00499
00500 result = FALSE;
00501 if (!_dbus_string_init (&f))
00502 {
00503 _DBUS_SET_OOM (error);
00504 return FALSE;
00505 }
00506
00507 if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR))
00508 {
00509 _DBUS_SET_OOM (error);
00510 goto out;
00511 }
00512
00513
00514 if (!_dbus_string_append (&f, username))
00515 {
00516 _DBUS_SET_OOM (error);
00517 goto out;
00518 }
00519
00520 result = _dbus_file_exists (_dbus_string_get_const_data (&f));
00521
00522 out:
00523 _dbus_string_free (&f);
00524
00525 return result;
00526 }
00527
00528
00535 dbus_bool_t
00536 _dbus_path_is_absolute (const DBusString *filename)
00537 {
00538 if (_dbus_string_get_length (filename) > 0)
00539 return _dbus_string_get_byte (filename, 0) == '/';
00540 else
00541 return FALSE;
00542 }
00543
00552 dbus_bool_t
00553 _dbus_stat (const DBusString *filename,
00554 DBusStat *statbuf,
00555 DBusError *error)
00556 {
00557 const char *filename_c;
00558 struct stat sb;
00559
00560 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00561
00562 filename_c = _dbus_string_get_const_data (filename);
00563
00564 if (stat (filename_c, &sb) < 0)
00565 {
00566 dbus_set_error (error, _dbus_error_from_errno (errno),
00567 "%s", _dbus_strerror (errno));
00568 return FALSE;
00569 }
00570
00571 statbuf->mode = sb.st_mode;
00572 statbuf->nlink = sb.st_nlink;
00573 statbuf->uid = sb.st_uid;
00574 statbuf->gid = sb.st_gid;
00575 statbuf->size = sb.st_size;
00576 statbuf->atime = sb.st_atime;
00577 statbuf->mtime = sb.st_mtime;
00578 statbuf->ctime = sb.st_ctime;
00579
00580 return TRUE;
00581 }
00582
00583
00587 struct DBusDirIter
00588 {
00589 DIR *d;
00591 };
00592
00600 DBusDirIter*
00601 _dbus_directory_open (const DBusString *filename,
00602 DBusError *error)
00603 {
00604 DIR *d;
00605 DBusDirIter *iter;
00606 const char *filename_c;
00607
00608 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00609
00610 filename_c = _dbus_string_get_const_data (filename);
00611
00612 d = opendir (filename_c);
00613 if (d == NULL)
00614 {
00615 dbus_set_error (error, _dbus_error_from_errno (errno),
00616 "Failed to read directory \"%s\": %s",
00617 filename_c,
00618 _dbus_strerror (errno));
00619 return NULL;
00620 }
00621 iter = dbus_new0 (DBusDirIter, 1);
00622 if (iter == NULL)
00623 {
00624 closedir (d);
00625 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
00626 "Could not allocate memory for directory iterator");
00627 return NULL;
00628 }
00629
00630 iter->d = d;
00631
00632 return iter;
00633 }
00634
00635
00636
00637
00638
00639
00640
00641
00642
00643 static dbus_bool_t
00644 dirent_buf_size(DIR * dirp, size_t *size)
00645 {
00646 long name_max;
00647 # if defined(HAVE_FPATHCONF) && defined(_PC_NAME_MAX)
00648 # if defined(HAVE_DIRFD)
00649 name_max = fpathconf(dirfd(dirp), _PC_NAME_MAX);
00650 # elif defined(HAVE_DDFD)
00651 name_max = fpathconf(dirp->dd_fd, _PC_NAME_MAX);
00652 # else
00653 name_max = fpathconf(dirp->__dd_fd, _PC_NAME_MAX);
00654 # endif
00655 if (name_max == -1)
00656 # if defined(NAME_MAX)
00657 name_max = NAME_MAX;
00658 # else
00659 return FALSE;
00660 # endif
00661 # elif defined(MAXNAMELEN)
00662 name_max = MAXNAMELEN;
00663 # else
00664 # if defined(NAME_MAX)
00665 name_max = NAME_MAX;
00666 # else
00667 # error "buffer size for readdir_r cannot be determined"
00668 # endif
00669 # endif
00670 if (size)
00671 *size = (size_t)offsetof(struct dirent, d_name) + name_max + 1;
00672 else
00673 return FALSE;
00674
00675 return TRUE;
00676 }
00677
00688 dbus_bool_t
00689 _dbus_directory_get_next_file (DBusDirIter *iter,
00690 DBusString *filename,
00691 DBusError *error)
00692 {
00693 struct dirent *d, *ent;
00694 size_t buf_size;
00695 int err;
00696
00697 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00698
00699 if (!dirent_buf_size (iter->d, &buf_size))
00700 {
00701 dbus_set_error (error, DBUS_ERROR_FAILED,
00702 "Can't calculate buffer size when reading directory");
00703 return FALSE;
00704 }
00705
00706 d = (struct dirent *)dbus_malloc (buf_size);
00707 if (!d)
00708 {
00709 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
00710 "No memory to read directory entry");
00711 return FALSE;
00712 }
00713
00714 again:
00715 err = readdir_r (iter->d, d, &ent);
00716 if (err || !ent)
00717 {
00718 if (err != 0)
00719 dbus_set_error (error,
00720 _dbus_error_from_errno (err),
00721 "%s", _dbus_strerror (err));
00722
00723 dbus_free (d);
00724 return FALSE;
00725 }
00726 else if (ent->d_name[0] == '.' &&
00727 (ent->d_name[1] == '\0' ||
00728 (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
00729 goto again;
00730 else
00731 {
00732 _dbus_string_set_length (filename, 0);
00733 if (!_dbus_string_append (filename, ent->d_name))
00734 {
00735 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
00736 "No memory to read directory entry");
00737 dbus_free (d);
00738 return FALSE;
00739 }
00740 else
00741 {
00742 dbus_free (d);
00743 return TRUE;
00744 }
00745 }
00746 }
00747
00751 void
00752 _dbus_directory_close (DBusDirIter *iter)
00753 {
00754 closedir (iter->d);
00755 dbus_free (iter);
00756 }
00757
00758 static dbus_bool_t
00759 fill_user_info_from_group (struct group *g,
00760 DBusGroupInfo *info,
00761 DBusError *error)
00762 {
00763 _dbus_assert (g->gr_name != NULL);
00764
00765 info->gid = g->gr_gid;
00766 info->groupname = _dbus_strdup (g->gr_name);
00767
00768
00769
00770 if (info->groupname == NULL)
00771 {
00772 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00773 return FALSE;
00774 }
00775
00776 return TRUE;
00777 }
00778
00779 static dbus_bool_t
00780 fill_group_info (DBusGroupInfo *info,
00781 dbus_gid_t gid,
00782 const DBusString *groupname,
00783 DBusError *error)
00784 {
00785 const char *group_c_str;
00786
00787 _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
00788 _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
00789
00790 if (groupname)
00791 group_c_str = _dbus_string_get_const_data (groupname);
00792 else
00793 group_c_str = NULL;
00794
00795
00796
00797
00798
00799
00800 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
00801 {
00802 struct group *g;
00803 int result;
00804 size_t buflen;
00805 char *buf;
00806 struct group g_str;
00807 dbus_bool_t b;
00808
00809
00810 buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
00811
00812
00813
00814
00815
00816 if ((long) buflen <= 0)
00817 buflen = 1024;
00818
00819 result = -1;
00820 while (1)
00821 {
00822 buf = dbus_malloc (buflen);
00823 if (buf == NULL)
00824 {
00825 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00826 return FALSE;
00827 }
00828
00829 g = NULL;
00830 #ifdef HAVE_POSIX_GETPWNAM_R
00831 if (group_c_str)
00832 result = getgrnam_r (group_c_str, &g_str, buf, buflen,
00833 &g);
00834 else
00835 result = getgrgid_r (gid, &g_str, buf, buflen,
00836 &g);
00837 #else
00838 g = getgrnam_r (group_c_str, &g_str, buf, buflen);
00839 result = 0;
00840 #endif
00841
00842
00843
00844 if (result == ERANGE && buflen < 512 * 1024)
00845 {
00846 dbus_free (buf);
00847 buflen *= 2;
00848 }
00849 else
00850 {
00851 break;
00852 }
00853 }
00854
00855 if (result == 0 && g == &g_str)
00856 {
00857 b = fill_user_info_from_group (g, info, error);
00858 dbus_free (buf);
00859 return b;
00860 }
00861 else
00862 {
00863 dbus_set_error (error, _dbus_error_from_errno (errno),
00864 "Group %s unknown or failed to look it up\n",
00865 group_c_str ? group_c_str : "???");
00866 dbus_free (buf);
00867 return FALSE;
00868 }
00869 }
00870 #else
00871 {
00872
00873 struct group *g;
00874
00875 g = getgrnam (group_c_str);
00876
00877 if (g != NULL)
00878 {
00879 return fill_user_info_from_group (g, info, error);
00880 }
00881 else
00882 {
00883 dbus_set_error (error, _dbus_error_from_errno (errno),
00884 "Group %s unknown or failed to look it up\n",
00885 group_c_str ? group_c_str : "???");
00886 return FALSE;
00887 }
00888 }
00889 #endif
00890 }
00891
00901 dbus_bool_t
00902 _dbus_group_info_fill (DBusGroupInfo *info,
00903 const DBusString *groupname,
00904 DBusError *error)
00905 {
00906 return fill_group_info (info, DBUS_GID_UNSET,
00907 groupname, error);
00908
00909 }
00910
00920 dbus_bool_t
00921 _dbus_group_info_fill_gid (DBusGroupInfo *info,
00922 dbus_gid_t gid,
00923 DBusError *error)
00924 {
00925 return fill_group_info (info, gid, NULL, error);
00926 }
00927
00936 dbus_bool_t
00937 _dbus_parse_unix_user_from_config (const DBusString *username,
00938 dbus_uid_t *uid_p)
00939 {
00940 return _dbus_get_user_id (username, uid_p);
00941
00942 }
00943
00952 dbus_bool_t
00953 _dbus_parse_unix_group_from_config (const DBusString *groupname,
00954 dbus_gid_t *gid_p)
00955 {
00956 return _dbus_get_group_id (groupname, gid_p);
00957 }
00958
00969 dbus_bool_t
00970 _dbus_unix_groups_from_uid (dbus_uid_t uid,
00971 dbus_gid_t **group_ids,
00972 int *n_group_ids)
00973 {
00974 return _dbus_groups_from_uid (uid, group_ids, n_group_ids);
00975 }
00976
00986 dbus_bool_t
00987 _dbus_unix_user_is_at_console (dbus_uid_t uid,
00988 DBusError *error)
00989 {
00990 return _dbus_is_console_user (uid, error);
00991
00992 }
00993
01001 dbus_bool_t
01002 _dbus_unix_user_is_process_owner (dbus_uid_t uid)
01003 {
01004 return uid == _dbus_geteuid ();
01005 }
01006
01014 dbus_bool_t
01015 _dbus_windows_user_is_process_owner (const char *windows_sid)
01016 {
01017 return FALSE;
01018 }
01019
01021
01033 dbus_bool_t
01034 _dbus_string_get_dirname (const DBusString *filename,
01035 DBusString *dirname)
01036 {
01037 int sep;
01038
01039 _dbus_assert (filename != dirname);
01040 _dbus_assert (filename != NULL);
01041 _dbus_assert (dirname != NULL);
01042
01043
01044 sep = _dbus_string_get_length (filename);
01045 if (sep == 0)
01046 return _dbus_string_append (dirname, ".");
01047
01048 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
01049 --sep;
01050
01051 _dbus_assert (sep >= 0);
01052
01053 if (sep == 0)
01054 return _dbus_string_append (dirname, "/");
01055
01056
01057 _dbus_string_find_byte_backward (filename, sep, '/', &sep);
01058 if (sep < 0)
01059 return _dbus_string_append (dirname, ".");
01060
01061
01062 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
01063 --sep;
01064
01065 _dbus_assert (sep >= 0);
01066
01067 if (sep == 0 &&
01068 _dbus_string_get_byte (filename, 0) == '/')
01069 return _dbus_string_append (dirname, "/");
01070 else
01071 return _dbus_string_copy_len (filename, 0, sep - 0,
01072 dirname, _dbus_string_get_length (dirname));
01073 }
01075
01076 static void
01077 string_squash_nonprintable (DBusString *str)
01078 {
01079 char *buf;
01080 int i, len;
01081
01082 buf = _dbus_string_get_data (str);
01083 len = _dbus_string_get_length (str);
01084
01085 for (i = 0; i < len; i++)
01086 {
01087 unsigned char c = (unsigned char) buf[i];
01088 if (c == '\0')
01089 c = ' ';
01090 else if (c < 0x20 || c > 127)
01091 c = '?';
01092 }
01093 }
01094
01109 dbus_bool_t
01110 _dbus_command_for_pid (unsigned long pid,
01111 DBusString *str,
01112 int max_len,
01113 DBusError *error)
01114 {
01115
01116 DBusString path;
01117 DBusString cmdline;
01118 int fd;
01119
01120 if (!_dbus_string_init (&path))
01121 {
01122 _DBUS_SET_OOM (error);
01123 return FALSE;
01124 }
01125
01126 if (!_dbus_string_init (&cmdline))
01127 {
01128 _DBUS_SET_OOM (error);
01129 _dbus_string_free (&path);
01130 return FALSE;
01131 }
01132
01133 if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid))
01134 goto oom;
01135
01136 fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
01137 if (fd < 0)
01138 {
01139 dbus_set_error (error,
01140 _dbus_error_from_errno (errno),
01141 "Failed to open \"%s\": %s",
01142 _dbus_string_get_const_data (&path),
01143 _dbus_strerror (errno));
01144 goto fail;
01145 }
01146
01147 if (!_dbus_read (fd, &cmdline, max_len))
01148 {
01149 dbus_set_error (error,
01150 _dbus_error_from_errno (errno),
01151 "Failed to read from \"%s\": %s",
01152 _dbus_string_get_const_data (&path),
01153 _dbus_strerror (errno));
01154 _dbus_close (fd, NULL);
01155 goto fail;
01156 }
01157
01158 if (!_dbus_close (fd, error))
01159 goto fail;
01160
01161 string_squash_nonprintable (&cmdline);
01162
01163 if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str)))
01164 goto oom;
01165
01166 _dbus_string_free (&cmdline);
01167 _dbus_string_free (&path);
01168 return TRUE;
01169 oom:
01170 _DBUS_SET_OOM (error);
01171 fail:
01172 _dbus_string_free (&cmdline);
01173 _dbus_string_free (&path);
01174 return FALSE;
01175 }
01176