26 #include "dbus-sysdeps.h"
27 #include "dbus-sysdeps-unix.h"
28 #include "dbus-internals.h"
29 #include "dbus-pipe.h"
30 #include "dbus-protocol.h"
31 #include "dbus-string.h"
32 #define DBUS_USERDB_INCLUDES_PRIVATE 1
33 #include "dbus-userdb.h"
34 #include "dbus-test.h"
36 #include <sys/types.h>
45 #ifdef HAVE_SYS_RESOURCE_H
46 #include <sys/resource.h>
49 #include <sys/socket.h>
54 #ifdef HAVE_SYS_SYSLIMITS_H
55 #include <sys/syslimits.h>
87 _dbus_verbose (
"Becoming a daemon...\n");
89 _dbus_verbose (
"chdir to /\n");
93 "Could not chdir() to root directory");
97 _dbus_verbose (
"forking...\n");
98 switch ((child_pid = fork ()))
101 _dbus_verbose (
"fork failed\n");
103 "Failed to fork daemon: %s", _dbus_strerror (errno));
108 _dbus_verbose (
"in child, closing std file descriptors\n");
115 dev_null_fd = open (
"/dev/null", O_RDWR);
116 if (dev_null_fd >= 0)
118 dup2 (dev_null_fd, 0);
119 dup2 (dev_null_fd, 1);
122 if (s ==
NULL || *s ==
'\0')
123 dup2 (dev_null_fd, 2);
125 _dbus_verbose (
"keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
131 _dbus_verbose (
"setting umask\n");
135 _dbus_verbose (
"calling setsid()\n");
145 _dbus_verbose (
"pid file or pipe write failed: %s\n",
147 kill (child_pid, SIGTERM);
151 _dbus_verbose (
"parent exiting\n");
169 _dbus_write_pid_file (
const DBusString *filename,
173 const char *cfilename;
179 fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
184 "Failed to open \"%s\": %s", cfilename,
185 _dbus_strerror (errno));
189 if ((f = fdopen (fd,
"w")) ==
NULL)
192 "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
197 if (fprintf (f,
"%lu\n", pid) < 0)
200 "Failed to write to \"%s\": %s", cfilename,
201 _dbus_strerror (errno));
207 if (fclose (f) == EOF)
210 "Failed to close \"%s\": %s", cfilename,
211 _dbus_strerror (errno));
238 if (!_dbus_write_pid_file (pidfile,
242 _dbus_verbose (
"pid file write failed\n");
243 _DBUS_ASSERT_ERROR_IS_SET(error);
249 _dbus_verbose (
"No pid file requested\n");
252 if (print_pid_pipe !=
NULL && _dbus_pipe_is_valid (print_pid_pipe))
257 _dbus_verbose (
"writing our pid to pipe %d\n",
262 _DBUS_SET_OOM (error);
270 _DBUS_SET_OOM (error);
275 if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
281 "Printing message bus PID: did not write enough bytes\n");
291 _dbus_verbose (
"No pid pipe to write to\n");
315 #ifndef HAVE_LIBAUDIT
336 "User '%s' does not appear to exist?",
348 if (setgroups (0,
NULL) < 0)
349 _dbus_warn (
"Failed to drop supplementary groups: %s\n",
350 _dbus_strerror (errno));
355 if (setgid (gid) < 0)
358 "Failed to set GID to %lu: %s", gid,
359 _dbus_strerror (errno));
363 if (setuid (uid) < 0)
366 "Failed to set UID to %lu: %s", uid,
367 _dbus_strerror (errno));
375 #ifdef HAVE_SETRLIMIT
386 _dbus_rlimit_save_fd_limit (
DBusError *error)
394 _DBUS_SET_OOM (error);
398 if (getrlimit (RLIMIT_NOFILE, &self->lim) < 0)
401 "Failed to get fd limit: %s", _dbus_strerror (errno));
410 _dbus_rlimit_raise_fd_limit_if_privileged (
unsigned int desired,
427 if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
430 "Failed to get fd limit: %s", _dbus_strerror (errno));
434 if (lim.rlim_cur == RLIM_INFINITY || lim.rlim_cur >= desired)
443 lim.rlim_cur = lim.rlim_max = desired;
445 if (setrlimit (RLIMIT_NOFILE, &lim) < 0)
448 "Failed to set fd limit to %u: %s",
449 desired, _dbus_strerror (errno));
457 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
460 if (setrlimit (RLIMIT_NOFILE, &saved->lim) < 0)
463 "Failed to restore old fd limit: %s",
464 _dbus_strerror (errno));
474 fd_limit_not_supported (
DBusError *error)
477 "cannot change fd limit on this platform");
481 _dbus_rlimit_save_fd_limit (
DBusError *error)
483 fd_limit_not_supported (error);
488 _dbus_rlimit_raise_fd_limit_if_privileged (
unsigned int desired,
491 fd_limit_not_supported (error);
496 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
499 fd_limit_not_supported (error);
506 _dbus_rlimit_free (DBusRLimit *lim)
512 _dbus_init_system_log (
void)
514 #if HAVE_DECL_LOG_PERROR
515 openlog (
"dbus", LOG_PID | LOG_PERROR, LOG_DAEMON);
517 openlog (
"dbus", LOG_PID, LOG_DAEMON);
534 va_start (args, msg);
557 case DBUS_SYSTEM_LOG_INFO:
558 flags = LOG_DAEMON | LOG_NOTICE;
560 case DBUS_SYSTEM_LOG_SECURITY:
561 flags = LOG_AUTH | LOG_NOTICE;
563 case DBUS_SYSTEM_LOG_FATAL:
564 flags = LOG_DAEMON|LOG_CRIT;
570 #ifndef HAVE_DECL_LOG_PERROR
575 DBUS_VA_COPY (tmp, args);
577 vfprintf (stderr, msg, tmp);
578 fputc (
'\n', stderr);
583 vsyslog (flags, msg, args);
585 if (severity == DBUS_SYSTEM_LOG_FATAL)
598 struct sigaction act;
601 sigemptyset (&empty_mask);
602 act.sa_handler = handler;
603 act.sa_mask = empty_mask;
605 sigaction (sig, &act,
NULL);
616 return (access (file, F_OK) == 0);
636 _DBUS_SET_OOM (error);
642 _DBUS_SET_OOM (error);
650 _DBUS_SET_OOM (error);
691 const char *filename_c;
694 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
698 if (stat (filename_c, &sb) < 0)
701 "%s", _dbus_strerror (errno));
705 statbuf->
mode = sb.st_mode;
706 statbuf->
nlink = sb.st_nlink;
707 statbuf->
uid = sb.st_uid;
708 statbuf->
gid = sb.st_gid;
709 statbuf->
size = sb.st_size;
710 statbuf->
atime = sb.st_atime;
711 statbuf->
mtime = sb.st_mtime;
712 statbuf->
ctime = sb.st_ctime;
740 const char *filename_c;
742 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
746 d = opendir (filename_c);
750 "Failed to read directory \"%s\": %s",
752 _dbus_strerror (errno));
760 "Could not allocate memory for directory iterator");
790 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
794 ent = readdir (iter->
d);
803 "%s", _dbus_strerror (err));
807 else if (ent->d_name[0] ==
'.' &&
808 (ent->d_name[1] ==
'\0' ||
809 (ent->d_name[1] ==
'.' && ent->d_name[2] ==
'\0')))
817 "No memory to read directory entry");
838 fill_user_info_from_group (
struct group *g,
844 info->
gid = g->gr_gid;
864 const char *group_c_str;
879 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
889 buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
895 if ((
long) buflen <= 0)
909 #ifdef HAVE_POSIX_GETPWNAM_R
911 result = getgrnam_r (group_c_str, &g_str, buf, buflen,
914 result = getgrgid_r (gid, &g_str, buf, buflen,
917 g = getgrnam_r (group_c_str, &g_str, buf, buflen);
923 if (result == ERANGE && buflen < 512 * 1024)
934 if (result == 0 && g == &g_str)
936 b = fill_user_info_from_group (g, info, error);
943 "Group %s unknown or failed to look it up\n",
944 group_c_str ? group_c_str :
"???");
954 g = getgrnam (group_c_str);
958 return fill_user_info_from_group (g, info, error);
963 "Group %s unknown or failed to look it up\n",
964 group_c_str ? group_c_str :
"???");
1004 return fill_group_info (info, gid,
NULL, error);
1164 for (i = 0; i < len; i++)
1166 unsigned char c = (
unsigned char) buf[i];
1169 else if (c < 0x20 || c > 127)
1201 _DBUS_SET_OOM (error);
1207 _DBUS_SET_OOM (error);
1220 "Failed to open \"%s\": %s",
1222 _dbus_strerror (errno));
1230 "Failed to read from \"%s\": %s",
1232 _dbus_strerror (errno));
1239 string_squash_nonprintable (&cmdline);
1248 _DBUS_SET_OOM (error);