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/* Setup and start system message bus, D-Bus
*
* Copyright (c) 2012-2025 Joachim Wiberg <troglobit@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <sys/types.h>
#ifdef _LIBITE_LITE
# include <libite/lite.h>
#else
# include <lite/lite.h>
#endif
#include "finit.h"
#include "config.h"
#include "helpers.h"
#include "plugin.h"
#include "service.h"
#include "util.h"
#include "conf.h"
#include "log.h"
#define DBUS_DAEMON "dbus-daemon"
#define DBUS_ARGS "--nofork --system --syslog-only"
#define DBUS_DESC "D-Bus message bus daemon"
#ifndef DBUS_DAEMONUSER
#define DBUS_DAEMONUSER "messagebus"
#endif
#ifndef DBUS_DAEMONGROUP
#define DBUS_DAEMONGROUP "messagebus"
#endif
/*
* Dumnpster diving for the D-Bus main configuration file
* where <pidfile> is defined.
*/
static char *dbus_pidfn(void)
{
char *alt[] = {
"/usr/share/dbus-1/system.conf",
"/etc/dbus-1/system.conf",
NULL
};
int i;
for (i = 0; alt[i]; i++) {
char *fn = alt[i];
char buf[256];
FILE *fp;
fp = fopen(fn, "r");
if (!fp)
continue;
fn = NULL;
while (fgets(buf, sizeof(buf), fp)) {
char *pos;
pos = strstr(buf, "<pidfile>");
if (!pos)
continue;
fn = pos + strlen("<pidfile>");
pos = strstr(fn, "</pidfile>");
if (!pos) {
fn = NULL;
break;
}
*pos = 0;
break;
}
fclose(fp);
if (fn)
return strdup(fn);
}
return NULL;
}
static void setup(void *arg)
{
char *group = DBUS_DAEMONGROUP;
char *user = DBUS_DAEMONUSER;
char line[256];
char *pidfn;
mode_t prev;
char *cmd;
if (rescue) {
dbg("Skipping %s plugin in rescue mode.", __FILE__);
return;
}
cmd = which(DBUS_DAEMON);
if (!cmd) {
dbg("Skipping plugin, %s is not installed.", DBUS_DAEMON);
return;
}
if (getuser(user, NULL) == -1) {
if (getuser("dbus", NULL) == -1)
user = "root"; /* fallback */
else
user = "dbus"; /* e.g., Buildroot */
}
if (getgroup(group) == -1) {
if (getgroup("dbus") == -1)
group = "root"; /* fallback */
else
group = "dbus"; /* e.g., Buildroot */
}
/* Clean up from any previous pre-bootstrap run */
pidfn = dbus_pidfn();
if (pidfn)
remove(pidfn);
dbg("Creating D-Bus Required Directories ...");
prev = umask(0);
mksubsys("/var/run/dbus", 0755, user, group);
mksubsys("/var/run/lock/subsys", 0755, user, group);
mksubsys("/var/lib/dbus", 0755, user, group);
mksubsys("/tmp/dbus", 0755, user, group);
umask(prev);
/* Generate machine id for dbus */
if (whichp("dbus-uuidgen"))
run_interactive("dbus-uuidgen --ensure", "Verifying D-Bus machine UUID");
/*
* Register service with Finit
* Note: dbus drops privs after starting up.
*/
if (pidfn) {
snprintf(line, sizeof(line), "[S123456789] cgroup.system notify:none name:dbus pid:!%s %s %s -- %s",
pidfn, cmd, DBUS_ARGS, DBUS_DESC);
free(pidfn);
} else
snprintf(line, sizeof(line), "[S123456789] cgroup.system notify:none name:dbus %s %s -- %s",
cmd, DBUS_ARGS, DBUS_DESC);
conf_save_service(SVC_TYPE_SERVICE, line, "dbus.conf");
free(cmd);
}
static plugin_t plugin = {
.name = __FILE__,
.hook[HOOK_SVC_PLUGIN] = { .cb = setup },
};
PLUGIN_INIT(__init)
{
plugin_register(&plugin);
}
PLUGIN_EXIT(__exit)
{
plugin_unregister(&plugin);
}
/**
* Local Variables:
* indent-tabs-mode: t
* c-file-style: "linux"
* End:
*/
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