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");
132 _dbus_verbose (
"setting umask\n");
136 _dbus_verbose (
"calling setsid()\n");
146 _dbus_verbose (
"pid file or pipe write failed: %s\n",
148 kill (child_pid, SIGTERM);
152 _dbus_verbose (
"parent exiting\n");
170 _dbus_write_pid_file (
const DBusString *filename,
174 const char *cfilename;
180 fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
185 "Failed to open \"%s\": %s", cfilename,
186 _dbus_strerror (errno));
190 if ((f = fdopen (fd,
"w")) ==
NULL)
193 "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
198 if (fprintf (f,
"%lu\n", pid) < 0)
201 "Failed to write to \"%s\": %s", cfilename,
202 _dbus_strerror (errno));
208 if (fclose (f) == EOF)
211 "Failed to close \"%s\": %s", cfilename,
212 _dbus_strerror (errno));
239 if (!_dbus_write_pid_file (pidfile,
243 _dbus_verbose (
"pid file write failed\n");
244 _DBUS_ASSERT_ERROR_IS_SET(error);
250 _dbus_verbose (
"No pid file requested\n");
253 if (print_pid_pipe !=
NULL && _dbus_pipe_is_valid (print_pid_pipe))
258 _dbus_verbose (
"writing our pid to pipe %d\n",
263 _DBUS_SET_OOM (error);
271 _DBUS_SET_OOM (error);
276 if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
282 "Printing message bus PID: did not write enough bytes\n");
292 _dbus_verbose (
"No pid pipe to write to\n");
316 #ifndef HAVE_LIBAUDIT
337 "User '%s' does not appear to exist?",
349 if (setgroups (0,
NULL) < 0)
350 _dbus_warn (
"Failed to drop supplementary groups: %s\n",
351 _dbus_strerror (errno));
356 if (setgid (gid) < 0)
359 "Failed to set GID to %lu: %s", gid,
360 _dbus_strerror (errno));
364 if (setuid (uid) < 0)
367 "Failed to set UID to %lu: %s", uid,
368 _dbus_strerror (errno));
376 #ifdef HAVE_SETRLIMIT
387 _dbus_rlimit_save_fd_limit (
DBusError *error)
395 _DBUS_SET_OOM (error);
399 if (getrlimit (RLIMIT_NOFILE, &self->lim) < 0)
402 "Failed to get fd limit: %s", _dbus_strerror (errno));
411 _dbus_rlimit_raise_fd_limit_if_privileged (
unsigned int desired,
428 if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
431 "Failed to get fd limit: %s", _dbus_strerror (errno));
435 if (lim.rlim_cur == RLIM_INFINITY || lim.rlim_cur >= desired)
444 lim.rlim_cur = lim.rlim_max = desired;
446 if (setrlimit (RLIMIT_NOFILE, &lim) < 0)
449 "Failed to set fd limit to %u: %s",
450 desired, _dbus_strerror (errno));
458 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
461 if (setrlimit (RLIMIT_NOFILE, &saved->lim) < 0)
464 "Failed to restore old fd limit: %s",
465 _dbus_strerror (errno));
475 fd_limit_not_supported (
DBusError *error)
478 "cannot change fd limit on this platform");
482 _dbus_rlimit_save_fd_limit (
DBusError *error)
484 fd_limit_not_supported (error);
489 _dbus_rlimit_raise_fd_limit_if_privileged (
unsigned int desired,
492 fd_limit_not_supported (error);
497 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
500 fd_limit_not_supported (error);
507 _dbus_rlimit_free (DBusRLimit *lim)
513 _dbus_init_system_log (
void)
515 #if HAVE_DECL_LOG_PERROR
516 openlog (
"dbus", LOG_PID | LOG_PERROR, LOG_DAEMON);
518 openlog (
"dbus", LOG_PID, LOG_DAEMON);
535 va_start (args, msg);
558 case DBUS_SYSTEM_LOG_INFO:
559 flags = LOG_DAEMON | LOG_NOTICE;
561 case DBUS_SYSTEM_LOG_SECURITY:
562 flags = LOG_AUTH | LOG_NOTICE;
564 case DBUS_SYSTEM_LOG_FATAL:
565 flags = LOG_DAEMON|LOG_CRIT;
571 #ifndef HAVE_DECL_LOG_PERROR
576 DBUS_VA_COPY (tmp, args);
578 vfprintf (stderr, msg, tmp);
579 fputc (
'\n', stderr);
584 vsyslog (flags, msg, args);
586 if (severity == DBUS_SYSTEM_LOG_FATAL)
599 struct sigaction act;
602 sigemptyset (&empty_mask);
603 act.sa_handler = handler;
604 act.sa_mask = empty_mask;
606 sigaction (sig, &act,
NULL);
617 return (access (file, F_OK) == 0);
637 _DBUS_SET_OOM (error);
643 _DBUS_SET_OOM (error);
651 _DBUS_SET_OOM (error);
692 const char *filename_c;
695 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
699 if (stat (filename_c, &sb) < 0)
702 "%s", _dbus_strerror (errno));
706 statbuf->
mode = sb.st_mode;
707 statbuf->
nlink = sb.st_nlink;
708 statbuf->
uid = sb.st_uid;
709 statbuf->
gid = sb.st_gid;
710 statbuf->
size = sb.st_size;
711 statbuf->
atime = sb.st_atime;
712 statbuf->
mtime = sb.st_mtime;
713 statbuf->
ctime = sb.st_ctime;
741 const char *filename_c;
743 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
747 d = opendir (filename_c);
751 "Failed to read directory \"%s\": %s",
753 _dbus_strerror (errno));
761 "Could not allocate memory for directory iterator");
791 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
795 ent = readdir (iter->
d);
804 "%s", _dbus_strerror (err));
808 else if (ent->d_name[0] ==
'.' &&
809 (ent->d_name[1] ==
'\0' ||
810 (ent->d_name[1] ==
'.' && ent->d_name[2] ==
'\0')))
818 "No memory to read directory entry");
839 fill_user_info_from_group (
struct group *g,
845 info->
gid = g->gr_gid;
865 const char *group_c_str;
880 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
890 buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
896 if ((
long) buflen <= 0)
910 #ifdef HAVE_POSIX_GETPWNAM_R
912 result = getgrnam_r (group_c_str, &g_str, buf, buflen,
915 result = getgrgid_r (gid, &g_str, buf, buflen,
918 g = getgrnam_r (group_c_str, &g_str, buf, buflen);
924 if (result == ERANGE && buflen < 512 * 1024)
935 if (result == 0 && g == &g_str)
937 b = fill_user_info_from_group (g, info, error);
944 "Group %s unknown or failed to look it up\n",
945 group_c_str ? group_c_str :
"???");
955 g = getgrnam (group_c_str);
959 return fill_user_info_from_group (g, info, error);
964 "Group %s unknown or failed to look it up\n",
965 group_c_str ? group_c_str :
"???");
1005 return fill_group_info (info, gid,
NULL, error);
1165 for (i = 0; i < len; i++)
1167 unsigned char c = (
unsigned char) buf[i];
1170 else if (c < 0x20 || c > 127)
1202 _DBUS_SET_OOM (error);
1208 _DBUS_SET_OOM (error);
1221 "Failed to open \"%s\": %s",
1223 _dbus_strerror (errno));
1231 "Failed to read from \"%s\": %s",
1233 _dbus_strerror (errno));
1241 string_squash_nonprintable (&cmdline);
1250 _DBUS_SET_OOM (error);