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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 #include <grp.h>
00046 #include <sys/socket.h>
00047 #include <dirent.h>
00048 #include <sys/un.h>
00049 #include <syslog.h>
00050
00051 #ifdef HAVE_SYS_SYSLIMITS_H
00052 #include <sys/syslimits.h>
00053 #endif
00054
00055 #ifndef O_BINARY
00056 #define O_BINARY 0
00057 #endif
00058
00074 dbus_bool_t
00075 _dbus_become_daemon (const DBusString *pidfile,
00076 DBusPipe *print_pid_pipe,
00077 DBusError *error,
00078 dbus_bool_t keep_umask)
00079 {
00080 const char *s;
00081 pid_t child_pid;
00082 int dev_null_fd;
00083
00084 _dbus_verbose ("Becoming a daemon...\n");
00085
00086 _dbus_verbose ("chdir to /\n");
00087 if (chdir ("/") < 0)
00088 {
00089 dbus_set_error (error, DBUS_ERROR_FAILED,
00090 "Could not chdir() to root directory");
00091 return FALSE;
00092 }
00093
00094 _dbus_verbose ("forking...\n");
00095 switch ((child_pid = fork ()))
00096 {
00097 case -1:
00098 _dbus_verbose ("fork failed\n");
00099 dbus_set_error (error, _dbus_error_from_errno (errno),
00100 "Failed to fork daemon: %s", _dbus_strerror (errno));
00101 return FALSE;
00102 break;
00103
00104 case 0:
00105 _dbus_verbose ("in child, closing std file descriptors\n");
00106
00107
00108
00109
00110
00111
00112 dev_null_fd = open ("/dev/null", O_RDWR);
00113 if (dev_null_fd >= 0)
00114 {
00115 dup2 (dev_null_fd, 0);
00116 dup2 (dev_null_fd, 1);
00117
00118 s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
00119 if (s == NULL || *s == '\0')
00120 dup2 (dev_null_fd, 2);
00121 else
00122 _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
00123 }
00124
00125 if (!keep_umask)
00126 {
00127
00128 _dbus_verbose ("setting umask\n");
00129 umask (022);
00130 }
00131
00132 _dbus_verbose ("calling setsid()\n");
00133 if (setsid () == -1)
00134 _dbus_assert_not_reached ("setsid() failed");
00135
00136 break;
00137
00138 default:
00139 if (!_dbus_write_pid_to_file_and_pipe (pidfile, print_pid_pipe,
00140 child_pid, error))
00141 {
00142 _dbus_verbose ("pid file or pipe write failed: %s\n",
00143 error->message);
00144 kill (child_pid, SIGTERM);
00145 return FALSE;
00146 }
00147
00148 _dbus_verbose ("parent exiting\n");
00149 _exit (0);
00150 break;
00151 }
00152
00153 return TRUE;
00154 }
00155
00156
00165 static dbus_bool_t
00166 _dbus_write_pid_file (const DBusString *filename,
00167 unsigned long pid,
00168 DBusError *error)
00169 {
00170 const char *cfilename;
00171 int fd;
00172 FILE *f;
00173
00174 cfilename = _dbus_string_get_const_data (filename);
00175
00176 fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
00177
00178 if (fd < 0)
00179 {
00180 dbus_set_error (error, _dbus_error_from_errno (errno),
00181 "Failed to open \"%s\": %s", cfilename,
00182 _dbus_strerror (errno));
00183 return FALSE;
00184 }
00185
00186 if ((f = fdopen (fd, "w")) == NULL)
00187 {
00188 dbus_set_error (error, _dbus_error_from_errno (errno),
00189 "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
00190 _dbus_close (fd, NULL);
00191 return FALSE;
00192 }
00193
00194 if (fprintf (f, "%lu\n", pid) < 0)
00195 {
00196 dbus_set_error (error, _dbus_error_from_errno (errno),
00197 "Failed to write to \"%s\": %s", cfilename,
00198 _dbus_strerror (errno));
00199
00200 fclose (f);
00201 return FALSE;
00202 }
00203
00204 if (fclose (f) == EOF)
00205 {
00206 dbus_set_error (error, _dbus_error_from_errno (errno),
00207 "Failed to close \"%s\": %s", cfilename,
00208 _dbus_strerror (errno));
00209 return FALSE;
00210 }
00211
00212 return TRUE;
00213 }
00214
00226 dbus_bool_t
00227 _dbus_write_pid_to_file_and_pipe (const DBusString *pidfile,
00228 DBusPipe *print_pid_pipe,
00229 dbus_pid_t pid_to_write,
00230 DBusError *error)
00231 {
00232 if (pidfile)
00233 {
00234 _dbus_verbose ("writing pid file %s\n", _dbus_string_get_const_data (pidfile));
00235 if (!_dbus_write_pid_file (pidfile,
00236 pid_to_write,
00237 error))
00238 {
00239 _dbus_verbose ("pid file write failed\n");
00240 _DBUS_ASSERT_ERROR_IS_SET(error);
00241 return FALSE;
00242 }
00243 }
00244 else
00245 {
00246 _dbus_verbose ("No pid file requested\n");
00247 }
00248
00249 if (print_pid_pipe != NULL && _dbus_pipe_is_valid (print_pid_pipe))
00250 {
00251 DBusString pid;
00252 int bytes;
00253
00254 _dbus_verbose ("writing our pid to pipe %"PRIuPTR"\n",
00255 print_pid_pipe->fd_or_handle);
00256
00257 if (!_dbus_string_init (&pid))
00258 {
00259 _DBUS_SET_OOM (error);
00260 return FALSE;
00261 }
00262
00263 if (!_dbus_string_append_int (&pid, pid_to_write) ||
00264 !_dbus_string_append (&pid, "\n"))
00265 {
00266 _dbus_string_free (&pid);
00267 _DBUS_SET_OOM (error);
00268 return FALSE;
00269 }
00270
00271 bytes = _dbus_string_get_length (&pid);
00272 if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
00273 {
00274
00275 if (error != NULL && !dbus_error_is_set(error))
00276 {
00277 dbus_set_error (error, DBUS_ERROR_FAILED,
00278 "Printing message bus PID: did not write enough bytes\n");
00279 }
00280 _dbus_string_free (&pid);
00281 return FALSE;
00282 }
00283
00284 _dbus_string_free (&pid);
00285 }
00286 else
00287 {
00288 _dbus_verbose ("No pid pipe to write to\n");
00289 }
00290
00291 return TRUE;
00292 }
00293
00300 dbus_bool_t
00301 _dbus_verify_daemon_user (const char *user)
00302 {
00303 DBusString u;
00304
00305 _dbus_string_init_const (&u, user);
00306
00307 return _dbus_get_user_id_and_primary_group (&u, NULL, NULL);
00308 }
00309
00310
00311
00312 #ifndef HAVE_LIBAUDIT
00313
00320 dbus_bool_t
00321 _dbus_change_to_daemon_user (const char *user,
00322 DBusError *error)
00323 {
00324 dbus_uid_t uid;
00325 dbus_gid_t gid;
00326 DBusString u;
00327
00328 _dbus_string_init_const (&u, user);
00329
00330 if (!_dbus_get_user_id_and_primary_group (&u, &uid, &gid))
00331 {
00332 dbus_set_error (error, DBUS_ERROR_FAILED,
00333 "User '%s' does not appear to exist?",
00334 user);
00335 return FALSE;
00336 }
00337
00338
00339
00340
00341
00342
00343
00344
00345 if (setgroups (0, NULL) < 0)
00346 _dbus_warn ("Failed to drop supplementary groups: %s\n",
00347 _dbus_strerror (errno));
00348
00349
00350
00351
00352 if (setgid (gid) < 0)
00353 {
00354 dbus_set_error (error, _dbus_error_from_errno (errno),
00355 "Failed to set GID to %lu: %s", gid,
00356 _dbus_strerror (errno));
00357 return FALSE;
00358 }
00359
00360 if (setuid (uid) < 0)
00361 {
00362 dbus_set_error (error, _dbus_error_from_errno (errno),
00363 "Failed to set UID to %lu: %s", uid,
00364 _dbus_strerror (errno));
00365 return FALSE;
00366 }
00367
00368 return TRUE;
00369 }
00370 #endif
00371
00372 void
00373 _dbus_init_system_log (void)
00374 {
00375 openlog ("dbus", LOG_PID, LOG_DAEMON);
00376 }
00385 void
00386 _dbus_system_log (DBusSystemLogSeverity severity, const char *msg, ...)
00387 {
00388 va_list args;
00389
00390 va_start (args, msg);
00391
00392 _dbus_system_logv (severity, msg, args);
00393
00394 va_end (args);
00395 }
00396
00407 void
00408 _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args)
00409 {
00410 int flags;
00411 switch (severity)
00412 {
00413 case DBUS_SYSTEM_LOG_INFO:
00414 flags = LOG_DAEMON | LOG_NOTICE;
00415 break;
00416 case DBUS_SYSTEM_LOG_SECURITY:
00417 flags = LOG_AUTH | LOG_NOTICE;
00418 break;
00419 case DBUS_SYSTEM_LOG_FATAL:
00420 flags = LOG_DAEMON|LOG_CRIT;
00421 default:
00422 return;
00423 }
00424
00425 vsyslog (flags, msg, args);
00426
00427 if (severity == DBUS_SYSTEM_LOG_FATAL)
00428 exit (1);
00429 }
00430
00436 void
00437 _dbus_set_signal_handler (int sig,
00438 DBusSignalHandler handler)
00439 {
00440 struct sigaction act;
00441 sigset_t empty_mask;
00442
00443 sigemptyset (&empty_mask);
00444 act.sa_handler = handler;
00445 act.sa_mask = empty_mask;
00446 act.sa_flags = 0;
00447 sigaction (sig, &act, NULL);
00448 }
00449
00455 dbus_bool_t
00456 _dbus_file_exists (const char *file)
00457 {
00458 return (access (file, F_OK) == 0);
00459 }
00460
00467 dbus_bool_t
00468 _dbus_user_at_console (const char *username,
00469 DBusError *error)
00470 {
00471
00472 DBusString f;
00473 dbus_bool_t result;
00474
00475 result = FALSE;
00476 if (!_dbus_string_init (&f))
00477 {
00478 _DBUS_SET_OOM (error);
00479 return FALSE;
00480 }
00481
00482 if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR))
00483 {
00484 _DBUS_SET_OOM (error);
00485 goto out;
00486 }
00487
00488
00489 if (!_dbus_string_append (&f, username))
00490 {
00491 _DBUS_SET_OOM (error);
00492 goto out;
00493 }
00494
00495 result = _dbus_file_exists (_dbus_string_get_const_data (&f));
00496
00497 out:
00498 _dbus_string_free (&f);
00499
00500 return result;
00501 }
00502
00503
00510 dbus_bool_t
00511 _dbus_path_is_absolute (const DBusString *filename)
00512 {
00513 if (_dbus_string_get_length (filename) > 0)
00514 return _dbus_string_get_byte (filename, 0) == '/';
00515 else
00516 return FALSE;
00517 }
00518
00527 dbus_bool_t
00528 _dbus_stat (const DBusString *filename,
00529 DBusStat *statbuf,
00530 DBusError *error)
00531 {
00532 const char *filename_c;
00533 struct stat sb;
00534
00535 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00536
00537 filename_c = _dbus_string_get_const_data (filename);
00538
00539 if (stat (filename_c, &sb) < 0)
00540 {
00541 dbus_set_error (error, _dbus_error_from_errno (errno),
00542 "%s", _dbus_strerror (errno));
00543 return FALSE;
00544 }
00545
00546 statbuf->mode = sb.st_mode;
00547 statbuf->nlink = sb.st_nlink;
00548 statbuf->uid = sb.st_uid;
00549 statbuf->gid = sb.st_gid;
00550 statbuf->size = sb.st_size;
00551 statbuf->atime = sb.st_atime;
00552 statbuf->mtime = sb.st_mtime;
00553 statbuf->ctime = sb.st_ctime;
00554
00555 return TRUE;
00556 }
00557
00558
00562 struct DBusDirIter
00563 {
00564 DIR *d;
00566 };
00567
00575 DBusDirIter*
00576 _dbus_directory_open (const DBusString *filename,
00577 DBusError *error)
00578 {
00579 DIR *d;
00580 DBusDirIter *iter;
00581 const char *filename_c;
00582
00583 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00584
00585 filename_c = _dbus_string_get_const_data (filename);
00586
00587 d = opendir (filename_c);
00588 if (d == NULL)
00589 {
00590 dbus_set_error (error, _dbus_error_from_errno (errno),
00591 "Failed to read directory \"%s\": %s",
00592 filename_c,
00593 _dbus_strerror (errno));
00594 return NULL;
00595 }
00596 iter = dbus_new0 (DBusDirIter, 1);
00597 if (iter == NULL)
00598 {
00599 closedir (d);
00600 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
00601 "Could not allocate memory for directory iterator");
00602 return NULL;
00603 }
00604
00605 iter->d = d;
00606
00607 return iter;
00608 }
00609
00610
00611
00612
00613
00614
00615
00616
00617
00618 static dbus_bool_t
00619 dirent_buf_size(DIR * dirp, size_t *size)
00620 {
00621 long name_max;
00622 # if defined(HAVE_FPATHCONF) && defined(_PC_NAME_MAX)
00623 # if defined(HAVE_DIRFD)
00624 name_max = fpathconf(dirfd(dirp), _PC_NAME_MAX);
00625 # elif defined(HAVE_DDFD)
00626 name_max = fpathconf(dirp->dd_fd, _PC_NAME_MAX);
00627 # else
00628 name_max = fpathconf(dirp->__dd_fd, _PC_NAME_MAX);
00629 # endif
00630 if (name_max == -1)
00631 # if defined(NAME_MAX)
00632 name_max = NAME_MAX;
00633 # else
00634 return FALSE;
00635 # endif
00636 # elif defined(MAXNAMELEN)
00637 name_max = MAXNAMELEN;
00638 # else
00639 # if defined(NAME_MAX)
00640 name_max = NAME_MAX;
00641 # else
00642 # error "buffer size for readdir_r cannot be determined"
00643 # endif
00644 # endif
00645 if (size)
00646 *size = (size_t)offsetof(struct dirent, d_name) + name_max + 1;
00647 else
00648 return FALSE;
00649
00650 return TRUE;
00651 }
00652
00663 dbus_bool_t
00664 _dbus_directory_get_next_file (DBusDirIter *iter,
00665 DBusString *filename,
00666 DBusError *error)
00667 {
00668 struct dirent *d, *ent;
00669 size_t buf_size;
00670 int err;
00671
00672 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
00673
00674 if (!dirent_buf_size (iter->d, &buf_size))
00675 {
00676 dbus_set_error (error, DBUS_ERROR_FAILED,
00677 "Can't calculate buffer size when reading directory");
00678 return FALSE;
00679 }
00680
00681 d = (struct dirent *)dbus_malloc (buf_size);
00682 if (!d)
00683 {
00684 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
00685 "No memory to read directory entry");
00686 return FALSE;
00687 }
00688
00689 again:
00690 err = readdir_r (iter->d, d, &ent);
00691 if (err || !ent)
00692 {
00693 if (err != 0)
00694 dbus_set_error (error,
00695 _dbus_error_from_errno (err),
00696 "%s", _dbus_strerror (err));
00697
00698 dbus_free (d);
00699 return FALSE;
00700 }
00701 else if (ent->d_name[0] == '.' &&
00702 (ent->d_name[1] == '\0' ||
00703 (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
00704 goto again;
00705 else
00706 {
00707 _dbus_string_set_length (filename, 0);
00708 if (!_dbus_string_append (filename, ent->d_name))
00709 {
00710 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
00711 "No memory to read directory entry");
00712 dbus_free (d);
00713 return FALSE;
00714 }
00715 else
00716 {
00717 dbus_free (d);
00718 return TRUE;
00719 }
00720 }
00721 }
00722
00726 void
00727 _dbus_directory_close (DBusDirIter *iter)
00728 {
00729 closedir (iter->d);
00730 dbus_free (iter);
00731 }
00732
00733 static dbus_bool_t
00734 fill_user_info_from_group (struct group *g,
00735 DBusGroupInfo *info,
00736 DBusError *error)
00737 {
00738 _dbus_assert (g->gr_name != NULL);
00739
00740 info->gid = g->gr_gid;
00741 info->groupname = _dbus_strdup (g->gr_name);
00742
00743
00744
00745 if (info->groupname == NULL)
00746 {
00747 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00748 return FALSE;
00749 }
00750
00751 return TRUE;
00752 }
00753
00754 static dbus_bool_t
00755 fill_group_info (DBusGroupInfo *info,
00756 dbus_gid_t gid,
00757 const DBusString *groupname,
00758 DBusError *error)
00759 {
00760 const char *group_c_str;
00761
00762 _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
00763 _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
00764
00765 if (groupname)
00766 group_c_str = _dbus_string_get_const_data (groupname);
00767 else
00768 group_c_str = NULL;
00769
00770
00771
00772
00773
00774
00775 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
00776 {
00777 struct group *g;
00778 int result;
00779 size_t buflen;
00780 char *buf;
00781 struct group g_str;
00782 dbus_bool_t b;
00783
00784
00785 buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
00786
00787
00788
00789
00790
00791 if ((long) buflen <= 0)
00792 buflen = 1024;
00793
00794 result = -1;
00795 while (1)
00796 {
00797 buf = dbus_malloc (buflen);
00798 if (buf == NULL)
00799 {
00800 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00801 return FALSE;
00802 }
00803
00804 g = NULL;
00805 #ifdef HAVE_POSIX_GETPWNAM_R
00806 if (group_c_str)
00807 result = getgrnam_r (group_c_str, &g_str, buf, buflen,
00808 &g);
00809 else
00810 result = getgrgid_r (gid, &g_str, buf, buflen,
00811 &g);
00812 #else
00813 g = getgrnam_r (group_c_str, &g_str, buf, buflen);
00814 result = 0;
00815 #endif
00816
00817
00818
00819 if (result == ERANGE && buflen < 512 * 1024)
00820 {
00821 dbus_free (buf);
00822 buflen *= 2;
00823 }
00824 else
00825 {
00826 break;
00827 }
00828 }
00829
00830 if (result == 0 && g == &g_str)
00831 {
00832 b = fill_user_info_from_group (g, info, error);
00833 dbus_free (buf);
00834 return b;
00835 }
00836 else
00837 {
00838 dbus_set_error (error, _dbus_error_from_errno (errno),
00839 "Group %s unknown or failed to look it up\n",
00840 group_c_str ? group_c_str : "???");
00841 dbus_free (buf);
00842 return FALSE;
00843 }
00844 }
00845 #else
00846 {
00847
00848 struct group *g;
00849
00850 g = getgrnam (group_c_str);
00851
00852 if (g != NULL)
00853 {
00854 return fill_user_info_from_group (g, info, error);
00855 }
00856 else
00857 {
00858 dbus_set_error (error, _dbus_error_from_errno (errno),
00859 "Group %s unknown or failed to look it up\n",
00860 group_c_str ? group_c_str : "???");
00861 return FALSE;
00862 }
00863 }
00864 #endif
00865 }
00866
00876 dbus_bool_t
00877 _dbus_group_info_fill (DBusGroupInfo *info,
00878 const DBusString *groupname,
00879 DBusError *error)
00880 {
00881 return fill_group_info (info, DBUS_GID_UNSET,
00882 groupname, error);
00883
00884 }
00885
00895 dbus_bool_t
00896 _dbus_group_info_fill_gid (DBusGroupInfo *info,
00897 dbus_gid_t gid,
00898 DBusError *error)
00899 {
00900 return fill_group_info (info, gid, NULL, error);
00901 }
00902
00911 dbus_bool_t
00912 _dbus_parse_unix_user_from_config (const DBusString *username,
00913 dbus_uid_t *uid_p)
00914 {
00915 return _dbus_get_user_id (username, uid_p);
00916
00917 }
00918
00927 dbus_bool_t
00928 _dbus_parse_unix_group_from_config (const DBusString *groupname,
00929 dbus_gid_t *gid_p)
00930 {
00931 return _dbus_get_group_id (groupname, gid_p);
00932 }
00933
00944 dbus_bool_t
00945 _dbus_unix_groups_from_uid (dbus_uid_t uid,
00946 dbus_gid_t **group_ids,
00947 int *n_group_ids)
00948 {
00949 return _dbus_groups_from_uid (uid, group_ids, n_group_ids);
00950 }
00951
00961 dbus_bool_t
00962 _dbus_unix_user_is_at_console (dbus_uid_t uid,
00963 DBusError *error)
00964 {
00965 return _dbus_is_console_user (uid, error);
00966
00967 }
00968
00976 dbus_bool_t
00977 _dbus_unix_user_is_process_owner (dbus_uid_t uid)
00978 {
00979 return uid == _dbus_geteuid ();
00980 }
00981
00989 dbus_bool_t
00990 _dbus_windows_user_is_process_owner (const char *windows_sid)
00991 {
00992 return FALSE;
00993 }
00994
00996
01008 dbus_bool_t
01009 _dbus_string_get_dirname (const DBusString *filename,
01010 DBusString *dirname)
01011 {
01012 int sep;
01013
01014 _dbus_assert (filename != dirname);
01015 _dbus_assert (filename != NULL);
01016 _dbus_assert (dirname != NULL);
01017
01018
01019 sep = _dbus_string_get_length (filename);
01020 if (sep == 0)
01021 return _dbus_string_append (dirname, ".");
01022
01023 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
01024 --sep;
01025
01026 _dbus_assert (sep >= 0);
01027
01028 if (sep == 0)
01029 return _dbus_string_append (dirname, "/");
01030
01031
01032 _dbus_string_find_byte_backward (filename, sep, '/', &sep);
01033 if (sep < 0)
01034 return _dbus_string_append (dirname, ".");
01035
01036
01037 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
01038 --sep;
01039
01040 _dbus_assert (sep >= 0);
01041
01042 if (sep == 0 &&
01043 _dbus_string_get_byte (filename, 0) == '/')
01044 return _dbus_string_append (dirname, "/");
01045 else
01046 return _dbus_string_copy_len (filename, 0, sep - 0,
01047 dirname, _dbus_string_get_length (dirname));
01048 }
01050
01051 static void
01052 string_squash_nonprintable (DBusString *str)
01053 {
01054 unsigned char *buf;
01055 int i, len;
01056
01057 buf = _dbus_string_get_data (str);
01058 len = _dbus_string_get_length (str);
01059
01060 for (i = 0; i < len; i++)
01061 {
01062 unsigned char c = (unsigned char) buf[i];
01063 if (c == '\0')
01064 c = ' ';
01065 else if (c < 0x20 || c > 127)
01066 c = '?';
01067 }
01068 }
01069
01084 dbus_bool_t
01085 _dbus_command_for_pid (unsigned long pid,
01086 DBusString *str,
01087 int max_len,
01088 DBusError *error)
01089 {
01090
01091 DBusString path;
01092 DBusString cmdline;
01093 int fd;
01094
01095 if (!_dbus_string_init (&path))
01096 {
01097 _DBUS_SET_OOM (error);
01098 return FALSE;
01099 }
01100
01101 if (!_dbus_string_init (&cmdline))
01102 {
01103 _DBUS_SET_OOM (error);
01104 _dbus_string_free (&path);
01105 return FALSE;
01106 }
01107
01108 if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid))
01109 goto oom;
01110
01111 fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
01112 if (fd < 0)
01113 {
01114 dbus_set_error (error,
01115 _dbus_error_from_errno (errno),
01116 "Failed to open \"%s\": %s",
01117 _dbus_string_get_const_data (&path),
01118 _dbus_strerror (errno));
01119 goto fail;
01120 }
01121
01122 if (!_dbus_read (fd, &cmdline, max_len))
01123 {
01124 dbus_set_error (error,
01125 _dbus_error_from_errno (errno),
01126 "Failed to read from \"%s\": %s",
01127 _dbus_string_get_const_data (&path),
01128 _dbus_strerror (errno));
01129 goto fail;
01130 }
01131
01132 if (!_dbus_close (fd, error))
01133 goto fail;
01134
01135 string_squash_nonprintable (&cmdline);
01136
01137 if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str)))
01138 goto oom;
01139
01140 _dbus_string_free (&cmdline);
01141 _dbus_string_free (&path);
01142 return TRUE;
01143 oom:
01144 _DBUS_SET_OOM (error);
01145 fail:
01146 _dbus_string_free (&cmdline);
01147 _dbus_string_free (&path);
01148 return FALSE;
01149 }