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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 }
00373
00381 void
00382 _dbus_log_info (const char *msg, va_list args)
00383 {
00384 vsyslog (LOG_DAEMON|LOG_NOTICE, msg, args);
00385 }
00386
00394 void
00395 _dbus_log_security (const char *msg, va_list args)
00396 {
00397 vsyslog (LOG_AUTH|LOG_NOTICE, msg, args);
00398 }
00399
00405 void
00406 _dbus_set_signal_handler (int sig,
00407 DBusSignalHandler handler)
00408 {
00409 struct sigaction act;
00410 sigset_t empty_mask;
00411
00412 sigemptyset (&empty_mask);
00413 act.sa_handler = handler;
00414 act.sa_mask = empty_mask;
00415 act.sa_flags = 0;
00416 sigaction (sig, &act, NULL);
00417 }
00418
00419
00427 dbus_bool_t
00428 _dbus_delete_directory (const DBusString *filename,
00429 DBusError *error)
00430 {
00431 const char *filename_c;
00432
00433 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00434
00435 filename_c = _dbus_string_get_const_data (filename);
00436
00437 if (rmdir (filename_c) != 0)
00438 {
00439 dbus_set_error (error, DBUS_ERROR_FAILED,
00440 "Failed to remove directory %s: %s\n",
00441 filename_c, _dbus_strerror (errno));
00442 return FALSE;
00443 }
00444
00445 return TRUE;
00446 }
00447
00453 dbus_bool_t
00454 _dbus_file_exists (const char *file)
00455 {
00456 return (access (file, F_OK) == 0);
00457 }
00458
00465 dbus_bool_t
00466 _dbus_user_at_console (const char *username,
00467 DBusError *error)
00468 {
00469
00470 DBusString f;
00471 dbus_bool_t result;
00472
00473 result = FALSE;
00474 if (!_dbus_string_init (&f))
00475 {
00476 _DBUS_SET_OOM (error);
00477 return FALSE;
00478 }
00479
00480 if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR))
00481 {
00482 _DBUS_SET_OOM (error);
00483 goto out;
00484 }
00485
00486
00487 if (!_dbus_string_append (&f, username))
00488 {
00489 _DBUS_SET_OOM (error);
00490 goto out;
00491 }
00492
00493 result = _dbus_file_exists (_dbus_string_get_const_data (&f));
00494
00495 out:
00496 _dbus_string_free (&f);
00497
00498 return result;
00499 }
00500
00501
00508 dbus_bool_t
00509 _dbus_path_is_absolute (const DBusString *filename)
00510 {
00511 if (_dbus_string_get_length (filename) > 0)
00512 return _dbus_string_get_byte (filename, 0) == '/';
00513 else
00514 return FALSE;
00515 }
00516
00525 dbus_bool_t
00526 _dbus_stat (const DBusString *filename,
00527 DBusStat *statbuf,
00528 DBusError *error)
00529 {
00530 const char *filename_c;
00531 struct stat sb;
00532
00533 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00534
00535 filename_c = _dbus_string_get_const_data (filename);
00536
00537 if (stat (filename_c, &sb) < 0)
00538 {
00539 dbus_set_error (error, _dbus_error_from_errno (errno),
00540 "%s", _dbus_strerror (errno));
00541 return FALSE;
00542 }
00543
00544 statbuf->mode = sb.st_mode;
00545 statbuf->nlink = sb.st_nlink;
00546 statbuf->uid = sb.st_uid;
00547 statbuf->gid = sb.st_gid;
00548 statbuf->size = sb.st_size;
00549 statbuf->atime = sb.st_atime;
00550 statbuf->mtime = sb.st_mtime;
00551 statbuf->ctime = sb.st_ctime;
00552
00553 return TRUE;
00554 }
00555
00556
00560 struct DBusDirIter
00561 {
00562 DIR *d;
00564 };
00565
00573 DBusDirIter*
00574 _dbus_directory_open (const DBusString *filename,
00575 DBusError *error)
00576 {
00577 DIR *d;
00578 DBusDirIter *iter;
00579 const char *filename_c;
00580
00581 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00582
00583 filename_c = _dbus_string_get_const_data (filename);
00584
00585 d = opendir (filename_c);
00586 if (d == NULL)
00587 {
00588 dbus_set_error (error, _dbus_error_from_errno (errno),
00589 "Failed to read directory \"%s\": %s",
00590 filename_c,
00591 _dbus_strerror (errno));
00592 return NULL;
00593 }
00594 iter = dbus_new0 (DBusDirIter, 1);
00595 if (iter == NULL)
00596 {
00597 closedir (d);
00598 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
00599 "Could not allocate memory for directory iterator");
00600 return NULL;
00601 }
00602
00603 iter->d = d;
00604
00605 return iter;
00606 }
00607
00608
00609
00610
00611
00612
00613
00614
00615
00616 static dbus_bool_t
00617 dirent_buf_size(DIR * dirp, size_t *size)
00618 {
00619 long name_max;
00620 # if defined(HAVE_FPATHCONF) && defined(_PC_NAME_MAX)
00621 # if defined(HAVE_DIRFD)
00622 name_max = fpathconf(dirfd(dirp), _PC_NAME_MAX);
00623 # elif defined(HAVE_DDFD)
00624 name_max = fpathconf(dirp->dd_fd, _PC_NAME_MAX);
00625 # else
00626 name_max = fpathconf(dirp->__dd_fd, _PC_NAME_MAX);
00627 # endif
00628 if (name_max == -1)
00629 # if defined(NAME_MAX)
00630 name_max = NAME_MAX;
00631 # else
00632 return FALSE;
00633 # endif
00634 # elif defined(MAXNAMELEN)
00635 name_max = MAXNAMELEN;
00636 # else
00637 # if defined(NAME_MAX)
00638 name_max = NAME_MAX;
00639 # else
00640 # error "buffer size for readdir_r cannot be determined"
00641 # endif
00642 # endif
00643 if (size)
00644 *size = (size_t)offsetof(struct dirent, d_name) + name_max + 1;
00645 else
00646 return FALSE;
00647
00648 return TRUE;
00649 }
00650
00661 dbus_bool_t
00662 _dbus_directory_get_next_file (DBusDirIter *iter,
00663 DBusString *filename,
00664 DBusError *error)
00665 {
00666 struct dirent *d, *ent;
00667 size_t buf_size;
00668 int err;
00669
00670 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00671
00672 if (!dirent_buf_size (iter->d, &buf_size))
00673 {
00674 dbus_set_error (error, DBUS_ERROR_FAILED,
00675 "Can't calculate buffer size when reading directory");
00676 return FALSE;
00677 }
00678
00679 d = (struct dirent *)dbus_malloc (buf_size);
00680 if (!d)
00681 {
00682 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
00683 "No memory to read directory entry");
00684 return FALSE;
00685 }
00686
00687 again:
00688 err = readdir_r (iter->d, d, &ent);
00689 if (err || !ent)
00690 {
00691 if (err != 0)
00692 dbus_set_error (error,
00693 _dbus_error_from_errno (err),
00694 "%s", _dbus_strerror (err));
00695
00696 dbus_free (d);
00697 return FALSE;
00698 }
00699 else if (ent->d_name[0] == '.' &&
00700 (ent->d_name[1] == '\0' ||
00701 (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
00702 goto again;
00703 else
00704 {
00705 _dbus_string_set_length (filename, 0);
00706 if (!_dbus_string_append (filename, ent->d_name))
00707 {
00708 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
00709 "No memory to read directory entry");
00710 dbus_free (d);
00711 return FALSE;
00712 }
00713 else
00714 {
00715 dbus_free (d);
00716 return TRUE;
00717 }
00718 }
00719 }
00720
00724 void
00725 _dbus_directory_close (DBusDirIter *iter)
00726 {
00727 closedir (iter->d);
00728 dbus_free (iter);
00729 }
00730
00731 static dbus_bool_t
00732 fill_user_info_from_group (struct group *g,
00733 DBusGroupInfo *info,
00734 DBusError *error)
00735 {
00736 _dbus_assert (g->gr_name != NULL);
00737
00738 info->gid = g->gr_gid;
00739 info->groupname = _dbus_strdup (g->gr_name);
00740
00741
00742
00743 if (info->groupname == NULL)
00744 {
00745 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00746 return FALSE;
00747 }
00748
00749 return TRUE;
00750 }
00751
00752 static dbus_bool_t
00753 fill_group_info (DBusGroupInfo *info,
00754 dbus_gid_t gid,
00755 const DBusString *groupname,
00756 DBusError *error)
00757 {
00758 const char *group_c_str;
00759
00760 _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
00761 _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
00762
00763 if (groupname)
00764 group_c_str = _dbus_string_get_const_data (groupname);
00765 else
00766 group_c_str = NULL;
00767
00768
00769
00770
00771
00772
00773 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
00774 {
00775 struct group *g;
00776 int result;
00777 size_t buflen;
00778 char *buf;
00779 struct group g_str;
00780 dbus_bool_t b;
00781
00782
00783 buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
00784
00785
00786
00787
00788
00789 if ((long) buflen <= 0)
00790 buflen = 1024;
00791
00792 result = -1;
00793 while (1)
00794 {
00795 buf = dbus_malloc (buflen);
00796 if (buf == NULL)
00797 {
00798 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00799 return FALSE;
00800 }
00801
00802 g = NULL;
00803 #ifdef HAVE_POSIX_GETPWNAM_R
00804 if (group_c_str)
00805 result = getgrnam_r (group_c_str, &g_str, buf, buflen,
00806 &g);
00807 else
00808 result = getgrgid_r (gid, &g_str, buf, buflen,
00809 &g);
00810 #else
00811 g = getgrnam_r (group_c_str, &g_str, buf, buflen);
00812 result = 0;
00813 #endif
00814
00815
00816
00817 if (result == ERANGE && buflen < 512 * 1024)
00818 {
00819 dbus_free (buf);
00820 buflen *= 2;
00821 }
00822 else
00823 {
00824 break;
00825 }
00826 }
00827
00828 if (result == 0 && g == &g_str)
00829 {
00830 b = fill_user_info_from_group (g, info, error);
00831 dbus_free (buf);
00832 return b;
00833 }
00834 else
00835 {
00836 dbus_set_error (error, _dbus_error_from_errno (errno),
00837 "Group %s unknown or failed to look it up\n",
00838 group_c_str ? group_c_str : "???");
00839 dbus_free (buf);
00840 return FALSE;
00841 }
00842 }
00843 #else
00844 {
00845
00846 struct group *g;
00847
00848 g = getgrnam (group_c_str);
00849
00850 if (g != NULL)
00851 {
00852 return fill_user_info_from_group (g, info, error);
00853 }
00854 else
00855 {
00856 dbus_set_error (error, _dbus_error_from_errno (errno),
00857 "Group %s unknown or failed to look it up\n",
00858 group_c_str ? group_c_str : "???");
00859 return FALSE;
00860 }
00861 }
00862 #endif
00863 }
00864
00874 dbus_bool_t
00875 _dbus_group_info_fill (DBusGroupInfo *info,
00876 const DBusString *groupname,
00877 DBusError *error)
00878 {
00879 return fill_group_info (info, DBUS_GID_UNSET,
00880 groupname, error);
00881
00882 }
00883
00893 dbus_bool_t
00894 _dbus_group_info_fill_gid (DBusGroupInfo *info,
00895 dbus_gid_t gid,
00896 DBusError *error)
00897 {
00898 return fill_group_info (info, gid, NULL, error);
00899 }
00900
00909 dbus_bool_t
00910 _dbus_parse_unix_user_from_config (const DBusString *username,
00911 dbus_uid_t *uid_p)
00912 {
00913 return _dbus_get_user_id (username, uid_p);
00914
00915 }
00916
00925 dbus_bool_t
00926 _dbus_parse_unix_group_from_config (const DBusString *groupname,
00927 dbus_gid_t *gid_p)
00928 {
00929 return _dbus_get_group_id (groupname, gid_p);
00930 }
00931
00942 dbus_bool_t
00943 _dbus_unix_groups_from_uid (dbus_uid_t uid,
00944 dbus_gid_t **group_ids,
00945 int *n_group_ids)
00946 {
00947 return _dbus_groups_from_uid (uid, group_ids, n_group_ids);
00948 }
00949
00959 dbus_bool_t
00960 _dbus_unix_user_is_at_console (dbus_uid_t uid,
00961 DBusError *error)
00962 {
00963 return _dbus_is_console_user (uid, error);
00964
00965 }
00966
00974 dbus_bool_t
00975 _dbus_unix_user_is_process_owner (dbus_uid_t uid)
00976 {
00977 return uid == _dbus_geteuid ();
00978 }
00979
00987 dbus_bool_t
00988 _dbus_windows_user_is_process_owner (const char *windows_sid)
00989 {
00990 return FALSE;
00991 }
00992
00994
01006 dbus_bool_t
01007 _dbus_string_get_dirname (const DBusString *filename,
01008 DBusString *dirname)
01009 {
01010 int sep;
01011
01012 _dbus_assert (filename != dirname);
01013 _dbus_assert (filename != NULL);
01014 _dbus_assert (dirname != NULL);
01015
01016
01017 sep = _dbus_string_get_length (filename);
01018 if (sep == 0)
01019 return _dbus_string_append (dirname, ".");
01020
01021 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
01022 --sep;
01023
01024 _dbus_assert (sep >= 0);
01025
01026 if (sep == 0)
01027 return _dbus_string_append (dirname, "/");
01028
01029
01030 _dbus_string_find_byte_backward (filename, sep, '/', &sep);
01031 if (sep < 0)
01032 return _dbus_string_append (dirname, ".");
01033
01034
01035 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
01036 --sep;
01037
01038 _dbus_assert (sep >= 0);
01039
01040 if (sep == 0 &&
01041 _dbus_string_get_byte (filename, 0) == '/')
01042 return _dbus_string_append (dirname, "/");
01043 else
01044 return _dbus_string_copy_len (filename, 0, sep - 0,
01045 dirname, _dbus_string_get_length (dirname));
01046 }
01048
01049 static void
01050 string_squash_nonprintable (DBusString *str)
01051 {
01052 char *buf;
01053 int i, len;
01054
01055 buf = _dbus_string_get_data (str);
01056 len = _dbus_string_get_length (str);
01057
01058 for (i = 0; i < len; i++)
01059 {
01060 unsigned char c = (unsigned char) buf[i];
01061 if (c == '\0')
01062 c = ' ';
01063 else if (c < 0x20 || c > 127)
01064 c = '?';
01065 }
01066 }
01067
01082 dbus_bool_t
01083 _dbus_command_for_pid (unsigned long pid,
01084 DBusString *str,
01085 int max_len,
01086 DBusError *error)
01087 {
01088
01089 DBusString path;
01090 DBusString cmdline;
01091 int fd;
01092
01093 if (!_dbus_string_init (&path))
01094 {
01095 _DBUS_SET_OOM (error);
01096 return FALSE;
01097 }
01098
01099 if (!_dbus_string_init (&cmdline))
01100 {
01101 _DBUS_SET_OOM (error);
01102 _dbus_string_free (&path);
01103 return FALSE;
01104 }
01105
01106 if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid))
01107 goto oom;
01108
01109 fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
01110 if (fd < 0)
01111 {
01112 dbus_set_error (error,
01113 _dbus_error_from_errno (errno),
01114 "Failed to open \"%s\": %s",
01115 _dbus_string_get_const_data (&path),
01116 _dbus_strerror (errno));
01117 goto fail;
01118 }
01119
01120 if (!_dbus_read (fd, &cmdline, max_len))
01121 {
01122 dbus_set_error (error,
01123 _dbus_error_from_errno (errno),
01124 "Failed to read from \"%s\": %s",
01125 _dbus_string_get_const_data (&path),
01126 _dbus_strerror (errno));
01127 goto fail;
01128 }
01129
01130 if (!_dbus_close (fd, error))
01131 goto fail;
01132
01133 string_squash_nonprintable (&cmdline);
01134
01135 if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str)))
01136 goto oom;
01137
01138 _dbus_string_free (&cmdline);
01139 _dbus_string_free (&path);
01140 return TRUE;
01141 oom:
01142 _DBUS_SET_OOM (error);
01143 fail:
01144 _dbus_string_free (&cmdline);
01145 _dbus_string_free (&path);
01146 return FALSE;
01147 }
01148