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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* bridged - bridging control daemon.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <string.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <syslog.h>
#include <locale.h>
#include <stropts.h>
#include "global.h"
boolean_t debugging;
uint32_t tablemax;
const char *instance_name = "default";
struct pollfd *fdarray;
dladm_handle_t dlhandle;
boolean_t shutting_down;
static pthread_t sighand;
/*
* engine_lock is held while the main loop is busy calling librstp functions.
* Door threads take the lock to protect the library from reentrancy.
*/
static pthread_mutex_t engine_lock = PTHREAD_MUTEX_INITIALIZER;
/*
* These wrapper functions allow the other components in the daemon to remain
* ignorant of pthreads details.
*/
int
lock_engine(void)
{
return (pthread_mutex_lock(&engine_lock));
}
void
unlock_engine(void)
{
(void) pthread_mutex_unlock(&engine_lock);
}
/*
* Utility function for STREAMS ioctls.
*/
ssize_t
strioctl(int fd, int cmd, void *buf, size_t buflen)
{
int retv;
struct strioctl ic;
ic.ic_cmd = cmd;
ic.ic_timout = 0;
ic.ic_dp = buf;
ic.ic_len = buflen;
if ((retv = ioctl(fd, I_STR, &ic)) != 0)
return (retv);
else
return (ic.ic_len);
}
static void
daemonize(void)
{
pid_t pid;
/*
* A little bit of magic here. By the first fork+setsid, we
* disconnect from our current controlling terminal and become
* a session group leader. By forking again without calling
* setsid again, we make certain that we are not the session
* group leader and can never reacquire a controlling terminal.
*/
if ((pid = fork()) == (pid_t)-1) {
syslog(LOG_ERR, "fork 1 failed");
exit(EXIT_FAILURE);
}
if (pid != 0) {
(void) wait(NULL);
_exit(EXIT_SUCCESS);
}
if (setsid() == (pid_t)-1) {
syslog(LOG_ERR, "setsid");
exit(EXIT_FAILURE);
}
if ((pid = fork()) == (pid_t)-1) {
syslog(LOG_ERR, "fork 2 failed");
exit(EXIT_FAILURE);
}
if (pid != 0)
_exit(EXIT_SUCCESS);
(void) chdir("/");
(void) umask(022);
}
static void *
sighandler(void *arg)
{
sigset_t sigset;
int sig;
int sigfd = (int)(uintptr_t)arg;
(void) sigfillset(&sigset);
for (;;) {
sig = sigwait(&sigset);
switch (sig) {
case SIGHUP:
(void) write(sigfd, "", 1);
break;
default:
if (debugging)
syslog(LOG_NOTICE, "%s signal, shutting down",
strsignal(sig));
shutting_down = B_TRUE;
break;
}
/* if we're shutting down, exit this thread */
if (shutting_down)
return (NULL);
}
}
static void
init_signalhandling(void)
{
pthread_attr_t attr;
int err;
sigset_t new;
int fildes[2];
if ((fdarray = malloc(FDOFFSET * sizeof (struct pollfd))) == NULL) {
syslog(LOG_ERR, "unable to allocate fdarray: %m");
exit(EXIT_FAILURE);
}
if (pipe(fildes) != 0) {
syslog(LOG_ERR, "unable to create signal pipe: %m");
exit(EXIT_FAILURE);
}
fdarray[0].fd = fildes[0];
fdarray[0].events = POLLIN;
assert(control_fd != -1);
fdarray[1].fd = control_fd;
fdarray[1].events = POLLIN;
(void) sigfillset(&new);
(void) pthread_sigmask(SIG_BLOCK, &new, NULL);
(void) pthread_attr_init(&attr);
(void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
err = pthread_create(&sighand, &attr, sighandler,
(void *)(uintptr_t)fildes[1]);
if (err != 0) {
syslog(LOG_ERR, "cannot create signal handling thread: %s",
strerror(err));
exit(EXIT_FAILURE);
}
(void) pthread_attr_destroy(&attr);
}
int
main(int argc, char **argv)
{
dladm_status_t status;
char buf[DLADM_STRSIZE];
(void) setlocale(LC_ALL, "");
(void) textdomain(TEXT_DOMAIN);
shutting_down = B_FALSE;
openlog("bridged", LOG_PID | LOG_NDELAY, LOG_DAEMON);
if (argc != 2) {
syslog(LOG_ERR, "instance name is required");
exit(EXIT_FAILURE);
}
instance_name = argv[1];
if ((status = dladm_open(&dlhandle)) != DLADM_STATUS_OK) {
syslog(LOG_ERR, "%s: unable to open datalink control: %s",
instance_name, dladm_status2str(status, buf));
exit(EXIT_FAILURE);
}
status = dladm_bridge_get_privprop(instance_name, &debugging,
&tablemax);
if (status != DLADM_STATUS_OK) {
syslog(LOG_ERR, "%s: unable to read properties: %s",
instance_name, dladm_status2str(status, buf));
exit(EXIT_FAILURE);
}
/* Get the properties once so that we have the right initial values */
rstp_init();
open_bridge_control();
daemonize();
init_signalhandling();
init_door();
if (debugging)
syslog(LOG_INFO, "bridged started: instance %s", instance_name);
event_loop();
(void) pthread_cancel(sighand);
(void) pthread_join(sighand, NULL);
return (0);
}
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