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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 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* netcfgd - network configuration daemon. At present, this daemon implements
* the configuration backend for libnwam (via calls to nwam_backend_init()
* and nwam_backend_fini()). Initialization of the backend creates a door
* that libnwam calls use to read, update and destroy persistent configuration.
*
* More long-term, netcfgd will be used to manage other sources of configuration
* data and the backend functionality currently contained in libnwam will be
* generalized.
*/
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <wait.h>
#include <libnwam_priv.h>
#include <libnwam.h>
static const char *progname;
static boolean_t fg = B_FALSE;
/*
* This function allows you to drop a dtrace probe here and trace
* complete strings (not just those containing formatting). It's
* important that we actually format the strings so we could trace them
* even if we choose not to log them.
*/
static void
log_out(int severity, const char *str)
{
if (fg) {
(void) fprintf(stderr, "%s: %s\n", progname, str);
} else {
syslog(severity, str);
}
}
/* PRINTFLIKE2 */
void
nlog(int severity, const char *fmt, ...)
{
va_list ap;
char *vbuf;
va_start(ap, fmt);
if (vasprintf(&vbuf, fmt, ap) != -1) {
log_out(severity, vbuf);
free(vbuf);
}
va_end(ap);
}
static void
start_logging(void)
{
if (!fg)
openlog(progname, LOG_PID, LOG_DAEMON);
nlog(LOG_DEBUG, "%s started", progname);
}
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()) == -1) {
nlog(LOG_ERR, "fork 1 failed");
exit(EXIT_FAILURE);
}
if (pid != 0) {
(void) wait(NULL);
nlog(LOG_DEBUG, "child %ld exited, daemonizing", pid);
_exit(0);
}
if (setsid() == (pid_t)-1) {
nlog(LOG_ERR, "setsid");
exit(EXIT_FAILURE);
}
if ((pid = fork()) == -1) {
nlog(LOG_ERR, "fork 2 failed");
exit(EXIT_FAILURE);
}
if (pid != 0) {
_exit(0);
}
(void) chdir("/");
(void) umask(022);
}
/* ARGSUSED */
static void
graceful_shutdown(int signo)
{
nwam_backend_fini();
exit(EXIT_SUCCESS);
}
int
main(int argc, char *argv[])
{
int c;
nwam_error_t err;
if ((progname = strrchr(argv[0], '/')) == NULL)
progname = argv[0];
else
progname++;
while ((c = getopt(argc, argv, "f")) != -1) {
switch (c) {
case 'f':
fg = B_TRUE;
break;
default:
(void) fprintf(stderr, "%s: unrecognized option %c\n",
progname, optopt);
exit(EXIT_FAILURE);
}
}
start_logging();
if (!fg)
daemonize();
(void) signal(SIGTERM, graceful_shutdown);
(void) signal(SIGQUIT, graceful_shutdown);
(void) signal(SIGPIPE, SIG_IGN);
(void) signal(SIGCHLD, SIG_IGN);
(void) atexit(nwam_backend_fini);
if ((err = nwam_backend_init()) != NWAM_SUCCESS) {
nlog(LOG_ERR,
"couldn't initialize libnwam backend: %s",
nwam_strerror(err));
exit(EXIT_FAILURE);
}
for (;;)
(void) pause();
/* NOTREACHED */
return (EXIT_SUCCESS);
}
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