lib/netcfgd/netcfgd.c

6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey/*
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * CDDL HEADER START
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey *
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * The contents of this file are subject to the terms of the
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * Common Development and Distribution License (the "License").
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * You may not use this file except in compliance with the License.
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey *
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * or http://www.opensolaris.org/os/licensing.
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * See the License for the specific language governing permissions
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * and limitations under the License.
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey *
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * When distributing Covered Code, include this CDDL HEADER in each
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * If applicable, add the following below this CDDL HEADER, with the
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * fields enclosed by brackets "[]" replaced with your own identifying
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * information: Portions Copyright [yyyy] [name of copyright owner]
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey *
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * CDDL HEADER END
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey */
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey/*
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * Use is subject to license terms.
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey */
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey/*
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * netcfgd - network configuration daemon.  At present, this daemon implements
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * the configuration backend for libnwam (via calls to nwam_backend_init()
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * and nwam_backend_fini()).  Initialization of the backend creates a  door
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * that libnwam calls use to read, update and destroy persistent configuration.
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey *
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * More long-term, netcfgd will be used to manage other sources of configuration
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * data and the backend functionality currently contained in libnwam will be
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * generalized.
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey */
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <errno.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <signal.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <stdio.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <stdarg.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <stdlib.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <string.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <syslog.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <sys/types.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <sys/stat.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <unistd.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <wait.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <libnwam_priv.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey#include <libnwam.h>
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeystatic const char *progname;
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeystatic boolean_t fg = B_FALSE;
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey/*
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * This function allows you to drop a dtrace probe here and trace
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * complete strings (not just those containing formatting).  It's
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * important that we actually format the strings so we could trace them
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey * even if we choose not to log them.
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey */
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeystatic void
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeylog_out(int severity, const char *str)
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey{
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    if (fg) {
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        (void) fprintf(stderr, "%s: %s\n", progname, str);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    } else {
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        syslog(severity, str);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    }
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey}
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey/* PRINTFLIKE2 */
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeyvoid
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeynlog(int severity, const char *fmt, ...)
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey{
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    va_list ap;
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    char *vbuf;
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    va_start(ap, fmt);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    if (vasprintf(&vbuf, fmt, ap) != -1) {
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        log_out(severity, vbuf);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        free(vbuf);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    }
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    va_end(ap);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey}
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeystatic void
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeystart_logging(void)
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey{
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    if (!fg)
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        openlog(progname, LOG_PID, LOG_DAEMON);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    nlog(LOG_DEBUG, "%s started", progname);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey}
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeystatic void
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeydaemonize(void)
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey{
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    pid_t pid;
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    /*
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey     * A little bit of magic here.  By the first fork+setsid, we
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey     * disconnect from our current controlling terminal and become
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey     * a session group leader.  By forking again without calling
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey     * setsid again, we make certain that we are not the session
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey     * group leader and can never reacquire a controlling terminal.
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey     */
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    if ((pid = fork()) == -1) {
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        nlog(LOG_ERR, "fork 1 failed");
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        exit(EXIT_FAILURE);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    }
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    if (pid != 0) {
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        (void) wait(NULL);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        nlog(LOG_DEBUG, "child %ld exited, daemonizing", pid);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        _exit(0);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    }
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    if (setsid() == (pid_t)-1) {
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        nlog(LOG_ERR, "setsid");
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        exit(EXIT_FAILURE);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    }
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    if ((pid = fork()) == -1) {
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        nlog(LOG_ERR, "fork 2 failed");
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        exit(EXIT_FAILURE);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    }
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    if (pid != 0) {
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        _exit(0);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    }
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    (void) chdir("/");
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    (void) umask(022);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey}
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey/* ARGSUSED */
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeystatic void
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeygraceful_shutdown(int signo)
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey{
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    nwam_backend_fini();
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    exit(EXIT_SUCCESS);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey}
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeyint
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskeymain(int argc, char *argv[])
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey{
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    int c;
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    nwam_error_t err;
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    if ((progname = strrchr(argv[0], '/')) == NULL)
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        progname = argv[0];
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    else
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        progname++;
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    while ((c = getopt(argc, argv, "f")) != -1) {
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        switch (c) {
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        case 'f':
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey            fg = B_TRUE;
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey            break;
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        default:
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey            (void) fprintf(stderr, "%s: unrecognized option %c\n",
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey                progname, optopt);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey            exit(EXIT_FAILURE);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        }
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    }
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    start_logging();
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    if (!fg)
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        daemonize();
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    (void) signal(SIGTERM, graceful_shutdown);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    (void) signal(SIGQUIT, graceful_shutdown);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    (void) signal(SIGPIPE, SIG_IGN);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    (void) signal(SIGCHLD, SIG_IGN);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    (void) atexit(nwam_backend_fini);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    if ((err = nwam_backend_init()) != NWAM_SUCCESS) {
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        nlog(LOG_ERR,
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey            "couldn't initialize libnwam backend: %s",
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey            nwam_strerror(err));
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        exit(EXIT_FAILURE);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    }
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    for (;;)
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey        (void) pause();
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    /* NOTREACHED */
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey    return (EXIT_SUCCESS);
6ba597c56d749c61b4f783157f63196d7b2445f0Anurag S. Maskey}