/*
 * 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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*
 * rpcbind.c
 * Implements the program, version to address mapping for rpc.
 *
 */

#include <dlfcn.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <rpc/rpc.h>
#include <netconfig.h>
#include <netdir.h>
#include <errno.h>
#include <sys/wait.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <thread.h>
#include <synch.h>
#include <deflt.h>
#include <stdarg.h>
#ifdef PORTMAP
#include <netinet/in.h>
#endif
#include <arpa/inet.h>
#include <sys/termios.h>
#include "rpcbind.h"
#include <sys/syslog.h>
#include <sys/stat.h>
#include <syslog.h>
#include <string.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <rpcsvc/daemon_utils.h>
#include <priv_utils.h>
#include <libscf.h>

#ifdef PORTMAP
extern void pmap_service(struct svc_req *, SVCXPRT *xprt);
#endif
extern void rpcb_service_3(struct svc_req *, SVCXPRT *xprt);
extern void rpcb_service_4(struct svc_req *, SVCXPRT *xprt);
extern void read_warmstart(void);
extern void write_warmstart(void);
extern int Is_ipv6present(void);

#define	MAX_FILEDESC_LIMIT	1023

static void terminate(int);
static void detachfromtty(void);
static void parseargs(int, char *[]);
static void rbllist_add(ulong_t, ulong_t, struct netconfig *, struct netbuf *);
static int init_transport(struct netconfig *);
static int check_netconfig(void);

static boolean_t check_hostserv(struct netconfig *, const char *, const char *);
static void rpcb_check_init(void);
static int setopt_reuseaddr(int);
static int setopt_anon_mlp(int);
static int setup_callit(int);

/* Global variables */
#ifdef ND_DEBUG
int debugging = 1;	/* Tell me what's going on */
#else
int debugging = 0;	/* Tell me what's going on */
#endif
static int ipv6flag = 0;
int doabort = 0;	/* When debugging, do an abort on errors */
static int listen_backlog = 64;
rpcblist_ptr list_rbl;	/* A list of version 3/4 rpcbind services */
char *loopback_dg;	/* Datagram loopback transport, for set and unset */
char *loopback_vc;	/* COTS loopback transport, for set and unset */
char *loopback_vc_ord;	/* COTS_ORD loopback transport, for set and unset */

boolean_t verboselog = B_FALSE;
boolean_t wrap_enabled = B_FALSE;
boolean_t allow_indirect = B_TRUE;

/* Local Variable */
static int warmstart = 0;	/* Grab a old copy of registrations */

#ifdef PORTMAP
PMAPLIST *list_pml;	/* A list of version 2 rpcbind services */
char *udptrans;		/* Name of UDP transport */
char *tcptrans;		/* Name of TCP transport */
char *udp_uaddr;	/* Universal UDP address */
char *tcp_uaddr;	/* Universal TCP address */
#endif
static char servname[] = "rpcbind";
static char superuser[] = "superuser";

static const char daemon_dir[] = DAEMON_DIR;

int
main(int argc, char *argv[])
{
	struct netconfig *nconf;
	void *nc_handle;	/* Net config handle */
	struct rlimit rl;
	int maxrecsz = RPC_MAXDATASIZE;
	boolean_t can_do_mlp;

	parseargs(argc, argv);

	getrlimit(RLIMIT_NOFILE, &rl);

	if (rl.rlim_cur < MAX_FILEDESC_LIMIT) {
		if (rl.rlim_max <= MAX_FILEDESC_LIMIT)
			rl.rlim_cur = rl.rlim_max;
		else
			rl.rlim_cur = MAX_FILEDESC_LIMIT;
		setrlimit(RLIMIT_NOFILE, &rl);
	}
	(void) enable_extended_FILE_stdio(-1, -1);

	openlog("rpcbind", LOG_CONS, LOG_DAEMON);

	/*
	 * Create the daemon directory in /var/run
	 */
	if (mkdir(daemon_dir, DAEMON_DIR_MODE) == 0 || errno == EEXIST) {
		chmod(daemon_dir, DAEMON_DIR_MODE);
		chown(daemon_dir, DAEMON_UID, DAEMON_GID);
	} else {
		syslog(LOG_ERR, "failed to create \"%s\": %m", daemon_dir);
	}

	/*
	 * These privileges are required for the t_bind check rpcbind uses
	 * to determine whether a service is still live or not.
	 */
	can_do_mlp = priv_ineffect(PRIV_NET_BINDMLP);
	if (__init_daemon_priv(PU_RESETGROUPS|PU_CLEARLIMITSET, DAEMON_UID,
	    DAEMON_GID, PRIV_NET_PRIVADDR, PRIV_SYS_NFS,
	    can_do_mlp ? PRIV_NET_BINDMLP : NULL, NULL) == -1) {
		fprintf(stderr, "Insufficient privileges\n");
		exit(1);
	}

	/*
	 * Enable non-blocking mode and maximum record size checks for
	 * connection oriented transports.
	 */
	if (!rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrecsz)) {
		syslog(LOG_INFO, "unable to set RPC max record size");
	}

	nc_handle = setnetconfig(); 	/* open netconfig file */
	if (nc_handle == NULL) {
		syslog(LOG_ERR, "could not read /etc/netconfig");
		exit(1);
	}
	loopback_dg = "";
	loopback_vc = "";
	loopback_vc_ord = "";
#ifdef PORTMAP
	udptrans = "";
	tcptrans = "";
#endif

	{
		/*
		 * rpcbind is the first application to encounter the
		 * various netconfig files.  check_netconfig() verifies
		 * that they are set up correctly and complains loudly
		 * if not.
		 */
		int trouble;

		trouble = check_netconfig();
		if (trouble) {
			syslog(LOG_ERR,
	"%s: found %d errors with network configuration files. Exiting.",
				argv[0], trouble);
			fprintf(stderr,
	"%s: found %d errors with network configuration files. Exiting.\n",
				argv[0], trouble);
			exit(1);
		}
	}
	ipv6flag = Is_ipv6present();
	rpcb_check_init();
	while (nconf = getnetconfig(nc_handle)) {
		if (nconf->nc_flag & NC_VISIBLE)
			init_transport(nconf);
	}
	endnetconfig(nc_handle);

	if ((loopback_dg[0] == NULL) && (loopback_vc[0] == NULL) &&
		(loopback_vc_ord[0] == NULL)) {
		syslog(LOG_ERR, "could not find loopback transports");
		exit(1);
	}

	/* catch the usual termination signals for graceful exit */
	(void) signal(SIGINT, terminate);
	(void) signal(SIGTERM, terminate);
	(void) signal(SIGQUIT, terminate);
	/* ignore others that could get sent */
	(void) signal(SIGHUP, SIG_IGN);
	(void) signal(SIGUSR1, SIG_IGN);
	(void) signal(SIGUSR2, SIG_IGN);
	if (warmstart) {
		read_warmstart();
	}
	if (debugging) {
		printf("rpcbind debugging enabled.");
		if (doabort) {
			printf("  Will abort on errors!\n");
		} else {
			printf("\n");
		}
	} else {
		detachfromtty();
	}

	/* These are basic privileges we do not need */
	__fini_daemon_priv(PRIV_PROC_EXEC, PRIV_PROC_SESSION,
	    PRIV_FILE_LINK_ANY, PRIV_PROC_INFO, (char *)NULL);

	my_svc_run();
	syslog(LOG_ERR, "svc_run returned unexpectedly");
	rpcbind_abort();
	/* NOTREACHED */
}

/*
 * Increments a counter each time a problem is found with the network
 * configuration information.
 */
static int
check_netconfig(void)
{
	void	*nc;
	void	*dlcookie;
	int	busted = 0;
	int	i;
	int	lo_clts_found = 0, lo_cots_found = 0, lo_cotsord_found = 0;
	struct netconfig	*nconf, *np;
	struct stat	sb;

	nc = setnetconfig();
	if (nc == NULL) {
		if (debugging)
			fprintf(stderr,
				"setnetconfig() failed:  %s\n", nc_sperror());
		syslog(LOG_ALERT, "setnetconfig() failed:  %s", nc_sperror());
		return (1);
	}
	while (np = getnetconfig(nc)) {
		if ((np->nc_flag & NC_VISIBLE) == 0)
			continue;
		if (debugging)
			fprintf(stderr, "checking netid \"%s\"\n",
				np->nc_netid);
		if (strcmp(np->nc_protofmly, NC_LOOPBACK) == 0)
			switch (np->nc_semantics) {
			case NC_TPI_CLTS:
				lo_clts_found = 1;
				break;

			case NC_TPI_COTS:
				lo_cots_found = 1;
				break;

			case NC_TPI_COTS_ORD:
				lo_cotsord_found = 1;
				break;
			}
		if (stat(np->nc_device, &sb) == -1 && errno == ENOENT) {
			if (debugging)
				fprintf(stderr, "\tdevice %s does not exist\n",
					np->nc_device);
			syslog(LOG_ERR, "netid %s:  device %s does not exist",
				np->nc_netid, np->nc_device);
			busted++;
		} else
			if (debugging)
				fprintf(stderr, "\tdevice %s present\n",
					np->nc_device);
		for (i = 0; i < np->nc_nlookups; i++) {
			char	*libname = np->nc_lookups[i];

			if ((dlcookie = dlopen(libname, RTLD_LAZY)) == NULL) {
				char *dlerrstr;

				dlerrstr = dlerror();
				if (debugging) {
					fprintf(stderr,
	"\tnetid %s: dlopen of name-to-address library %s failed\ndlerror: %s",
	np->nc_netid, libname, dlerrstr ? dlerrstr : "");
				}
				syslog(LOG_ERR,
	"netid %s:  dlopen of name-to-address library %s failed",
						np->nc_netid, libname);
				if (dlerrstr)
					syslog(LOG_ERR, "%s", dlerrstr);
				busted++;
			} else {
				if (debugging)
					fprintf(stderr,
	"\tdlopen of name-to-address library %s succeeded\n", libname);
				(void) dlclose(dlcookie);
			}
		}
		nconf = getnetconfigent(np->nc_netid);

		if (!check_hostserv(nconf, HOST_SELF, ""))
			busted++;
		if (!check_hostserv(nconf, HOST_SELF_CONNECT, ""))
			busted++;
		if (!check_hostserv(nconf, HOST_SELF, "rpcbind"))
			busted++;
		if (!check_hostserv(nconf, HOST_SELF_CONNECT, "rpcbind"))
			busted++;

		freenetconfigent(nconf);
	}
	endnetconfig(nc);

	if (lo_clts_found) {
		if (debugging)
			fprintf(stderr, "Found CLTS loopback transport\n");
	} else {
		syslog(LOG_ALERT, "no CLTS loopback transport found\n");
		if (debugging)
			fprintf(stderr, "no CLTS loopback transport found\n");
	}
	if (lo_cots_found) {
		if (debugging)
			fprintf(stderr, "Found COTS loopback transport\n");
	} else {
		syslog(LOG_ALERT, "no COTS loopback transport found\n");
		if (debugging)
			fprintf(stderr, "no COTS loopback transport found\n");
	}
	if (lo_cotsord_found) {
		if (debugging)
			fprintf(stderr, "Found COTS ORD loopback transport\n");
	} else {
		syslog(LOG_ALERT, "no COTS ORD loopback transport found\n");
		if (debugging)
			fprintf(stderr,
				"no COTS ORD loopback transport found\n");
	}

	return (busted);
}

/*
 * Adds the entry into the rpcbind database.
 * If PORTMAP, then for UDP and TCP, it adds the entries for version 2 also
 * Returns 0 if succeeds, else fails
 */
static int
init_transport(struct netconfig *nconf)
{
	int fd;
	struct t_bind *taddr, *baddr;
	SVCXPRT	*my_xprt;
	struct nd_addrlist *nas;
	struct nd_hostserv hs;
	int status;	/* bound checking ? */
	static int msgprt = 0;

	if ((nconf->nc_semantics != NC_TPI_CLTS) &&
		(nconf->nc_semantics != NC_TPI_COTS) &&
		(nconf->nc_semantics != NC_TPI_COTS_ORD))
		return (1);	/* not my type */

	if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0) && !ipv6flag) {
		if (!msgprt)
			syslog(LOG_DEBUG,
"/etc/netconfig has IPv6 entries but IPv6 is not configured");
		msgprt++;
		return (1);
	}
#ifdef ND_DEBUG
	{
	int i;
	char **s;

	(void) fprintf(stderr, "%s: %d lookup routines :\n",
		nconf->nc_netid, nconf->nc_nlookups);
	for (i = 0, s = nconf->nc_lookups; i < nconf->nc_nlookups; i++, s++)
		fprintf(stderr, "[%d] - %s\n", i, *s);
	}
#endif

	if ((fd = t_open(nconf->nc_device, O_RDWR, NULL)) < 0) {
		syslog(LOG_ERR, "%s: cannot open connection: %s",
				nconf->nc_netid, t_errlist[t_errno]);
		return (1);
	}

	if (is_system_labeled() &&
	    (strcmp(nconf->nc_protofmly, NC_INET) == 0 ||
	    strcmp(nconf->nc_protofmly, NC_INET6) == 0) &&
	    setopt_anon_mlp(fd) == -1) {
		syslog(LOG_ERR, "%s: couldn't set SO_ANON_MLP option",
		    nconf->nc_netid);
	}

	/*
	 * Negotiate for returning the ucred of the caller. This should
	 * done before enabling the endpoint for service via
	 * t_bind() so that requests to rpcbind contain the uid.
	 */
	svc_fd_negotiate_ucred(fd);

	taddr = (struct t_bind *)t_alloc(fd, T_BIND, T_ADDR);
	baddr = (struct t_bind *)t_alloc(fd, T_BIND, T_ADDR);
	if ((baddr == NULL) || (taddr == NULL)) {
		syslog(LOG_ERR, "%s: cannot allocate netbuf: %s",
				nconf->nc_netid, t_errlist[t_errno]);
		exit(1);
	}

	/* Get rpcbind's address on this transport */
	hs.h_host = HOST_SELF;
	hs.h_serv = servname;
	if (netdir_getbyname(nconf, &hs, &nas))
		goto error;

	/* Copy the address */
	taddr->addr.len = nas->n_addrs->len;
	memcpy(taddr->addr.buf, nas->n_addrs->buf, (int)nas->n_addrs->len);
#ifdef ND_DEBUG
	{
	/* for debugging print out our universal address */
	char *uaddr;

	uaddr = taddr2uaddr(nconf, nas->n_addrs);
	(void) fprintf(stderr, "rpcbind : my address is %s\n", uaddr);
	(void) free(uaddr);
	}
#endif
	netdir_free((char *)nas, ND_ADDRLIST);

	if (nconf->nc_semantics == NC_TPI_CLTS)
		taddr->qlen = 0;
	else
		taddr->qlen = listen_backlog;

	if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
		/*
		 * Sm: If we are running then set SO_REUSEADDR option
		 * so that we can bind to our preferred address even if
		 * previous connections are in FIN_WAIT state
		 */
#ifdef ND_DEBUG
		fprintf(stdout, "Setting SO_REUSEADDR.\n");
#endif
		if (setopt_reuseaddr(fd) == -1) {
			syslog(LOG_ERR, "Couldn't set SO_REUSEADDR option");
		}
	}

	if (t_bind(fd, taddr, baddr) != 0) {
		syslog(LOG_ERR, "%s: cannot bind: %s",
			nconf->nc_netid, t_errlist[t_errno]);
		goto error;
	}


	if (memcmp(taddr->addr.buf, baddr->addr.buf, (int)baddr->addr.len)) {
		syslog(LOG_ERR, "%s: address in use", nconf->nc_netid);
		goto error;
	}

	my_xprt = (SVCXPRT *)svc_tli_create(fd, nconf, baddr, 0, 0);
	if (my_xprt == (SVCXPRT *)NULL) {
		syslog(LOG_ERR, "%s: could not create service",
				nconf->nc_netid);
		goto error;
	}

	/* set up multicast address for RPC CALL_IT, IPv6 */

	if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0) &&
	    (strcmp(nconf->nc_proto, NC_UDP) == 0)) {
		if (setup_callit(fd) < 0) {
			syslog(LOG_ERR, "Unable to join IPv6 multicast group \
for rpc broadcast %s", RPCB_MULTICAST_ADDR);
		}
	}

	if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
			svc_control(my_xprt, SVCSET_KEEPALIVE, (void *) TRUE);
	}

#ifdef PORTMAP
	/*
	 * Register both the versions for tcp/ip and udp/ip
	 */
	if ((strcmp(nconf->nc_protofmly, NC_INET) == 0) &&
		((strcmp(nconf->nc_proto, NC_TCP) == 0) ||
		(strcmp(nconf->nc_proto, NC_UDP) == 0))) {
		PMAPLIST *pml;

		if (!svc_register(my_xprt, PMAPPROG, PMAPVERS,
			pmap_service, NULL)) {
			syslog(LOG_ERR, "could not register on %s",
					nconf->nc_netid);
			goto error;
		}
		pml = (PMAPLIST *)malloc((uint_t)sizeof (PMAPLIST));
		if (pml == (PMAPLIST *)NULL) {
			syslog(LOG_ERR, "no memory!");
			exit(1);
		}
		pml->pml_map.pm_prog = PMAPPROG;
		pml->pml_map.pm_vers = PMAPVERS;
		pml->pml_map.pm_port = PMAPPORT;
		if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
			if (tcptrans[0]) {
				syslog(LOG_ERR,
				"cannot have more than one TCP transport");
				goto error;
			}
			tcptrans = strdup(nconf->nc_netid);
			pml->pml_map.pm_prot = IPPROTO_TCP;

			/* Let's snarf the universal address */
			/* "h1.h2.h3.h4.p1.p2" */
			tcp_uaddr = taddr2uaddr(nconf, &baddr->addr);
		} else {
			if (udptrans[0]) {
				syslog(LOG_ERR,
				"cannot have more than one UDP transport");
				goto error;
			}
			udptrans = strdup(nconf->nc_netid);
			pml->pml_map.pm_prot = IPPROTO_UDP;

			/* Let's snarf the universal address */
			/* "h1.h2.h3.h4.p1.p2" */
			udp_uaddr = taddr2uaddr(nconf, &baddr->addr);
		}
		pml->pml_next = list_pml;
		list_pml = pml;

		/* Add version 3 information */
		pml = (PMAPLIST *)malloc((uint_t)sizeof (PMAPLIST));
		if (pml == (PMAPLIST *)NULL) {
			syslog(LOG_ERR, "no memory!");
			exit(1);
		}
		pml->pml_map = list_pml->pml_map;
		pml->pml_map.pm_vers = RPCBVERS;
		pml->pml_next = list_pml;
		list_pml = pml;

		/* Add version 4 information */
		pml = (PMAPLIST *)malloc((uint_t)sizeof (PMAPLIST));
		if (pml == (PMAPLIST *)NULL) {
			syslog(LOG_ERR, "no memory!");
			exit(1);
		}
		pml->pml_map = list_pml->pml_map;
		pml->pml_map.pm_vers = RPCBVERS4;
		pml->pml_next = list_pml;
		list_pml = pml;

		/* Also add version 2 stuff to rpcbind list */
		rbllist_add(PMAPPROG, PMAPVERS, nconf, &baddr->addr);
	}
#endif

	/* version 3 registration */
	if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS, rpcb_service_3, NULL)) {
		syslog(LOG_ERR, "could not register %s version 3",
				nconf->nc_netid);
		goto error;
	}
	rbllist_add(RPCBPROG, RPCBVERS, nconf, &baddr->addr);

	/* version 4 registration */
	if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS4, rpcb_service_4, NULL)) {
		syslog(LOG_ERR, "could not register %s version 4",
				nconf->nc_netid);
		goto error;
	}
	rbllist_add(RPCBPROG, RPCBVERS4, nconf, &baddr->addr);

	if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
		if (nconf->nc_semantics == NC_TPI_CLTS)
			loopback_dg = strdup(nconf->nc_netid);
		else if (nconf->nc_semantics == NC_TPI_COTS)
			loopback_vc = strdup(nconf->nc_netid);
		else if (nconf->nc_semantics == NC_TPI_COTS_ORD)
			loopback_vc_ord = strdup(nconf->nc_netid);
	}

	/* decide if bound checking works for this transport */
	status = add_bndlist(nconf, taddr, baddr);
#ifdef BIND_DEBUG
	if (status < 0) {
		fprintf(stderr, "Error in finding bind status for %s\n",
			nconf->nc_netid);
	} else if (status == 0) {
		fprintf(stderr, "check binding for %s\n",
			nconf->nc_netid);
	} else if (status > 0) {
		fprintf(stderr, "No check binding for %s\n",
			nconf->nc_netid);
	}
#endif
	/*
	 * rmtcall only supported on CLTS transports for now.
	 * only needed when we are allowing indirect calls
	 */
	if (allow_indirect && nconf->nc_semantics == NC_TPI_CLTS) {
		status = create_rmtcall_fd(nconf);

#ifdef BIND_DEBUG
		if (status < 0) {
			fprintf(stderr, "Could not create rmtcall fd for %s\n",
				nconf->nc_netid);
		} else {
			fprintf(stderr, "rmtcall fd for %s is %d\n",
				nconf->nc_netid, status);
		}
#endif
	}
	(void) t_free((char *)taddr, T_BIND);
	(void) t_free((char *)baddr, T_BIND);
	return (0);
error:
	(void) t_free((char *)taddr, T_BIND);
	(void) t_free((char *)baddr, T_BIND);
	(void) t_close(fd);
	return (1);
}

static void
rbllist_add(ulong_t prog, ulong_t vers, struct netconfig *nconf,
	struct netbuf *addr)
{
	rpcblist_ptr rbl;

	rbl = (rpcblist_ptr)malloc((uint_t)sizeof (rpcblist));
	if (rbl == (rpcblist_ptr)NULL) {
		syslog(LOG_ERR, "no memory!");
		exit(1);
	}

	rbl->rpcb_map.r_prog = prog;
	rbl->rpcb_map.r_vers = vers;
	rbl->rpcb_map.r_netid = strdup(nconf->nc_netid);
	rbl->rpcb_map.r_addr = taddr2uaddr(nconf, addr);
	rbl->rpcb_map.r_owner = strdup(superuser);
	rbl->rpcb_next = list_rbl;	/* Attach to global list */
	list_rbl = rbl;
}

/*
 * Catch the signal and die
 */
/* ARGSUSED */
static void
terminate(int sig)
{
	syslog(LOG_ERR, "rpcbind terminating on signal.");
	write_warmstart();	/* Dump yourself */
	exit(2);
}

void
rpcbind_abort(void)
{
	write_warmstart();	/* Dump yourself */
	abort();
}

/*
 * detach from tty
 */
static void
detachfromtty(void)
{
	close(0);
	close(1);
	close(2);
	switch (forkall()) {
	case (pid_t)-1:
		perror("fork");
		break;
	case 0:
		break;
	default:
		exit(0);
	}
	setsid();
	(void) open("/dev/null", O_RDWR, 0);
	dup(0);
	dup(0);
}

/* get command line options */
static void
parseargs(int argc, char *argv[])
{
	int c;
	int tmp;

	while ((c = getopt(argc, argv, "dwal:")) != EOF) {
		switch (c) {
		case 'd':
			debugging = 1;
			break;
		case 'a':
			doabort = 1;	/* when debugging, do an abort on */
			break;		/* errors; for rpcbind developers */
					/* only! */
		case 'w':
			warmstart = 1;
			break;

		case 'l':
			if (sscanf(optarg, "%d", &tmp)) {
				if (tmp > listen_backlog) {
					listen_backlog = tmp;
				}
			}
			break;
		default:	/* error */
			fprintf(stderr,
			"usage: rpcbind [-d] [-w] [-l listen_backlog]\n");
			exit(1);
		}
	}
	if (doabort && !debugging) {
	    fprintf(stderr,
		"-a (abort) specified without -d (debugging) -- ignored.\n");
	    doabort = 0;
	}
}

static int
setopt_int(int fd, int level, int name, int value)
{
	struct t_optmgmt req, resp;
	struct {
		struct opthdr opt;
		int value;
	} optdata;

	optdata.opt.level = level;
	optdata.opt.name = name;
	optdata.opt.len = sizeof (int);

	optdata.value = value;

	req.flags = T_NEGOTIATE;
	req.opt.len = sizeof (optdata);
	req.opt.buf = (char *)&optdata;

	resp.flags = 0;
	resp.opt.buf = (char *)&optdata;
	resp.opt.maxlen = sizeof (optdata);

	if (t_optmgmt(fd, &req, &resp) < 0 || resp.flags != T_SUCCESS) {
		t_error("t_optmgmt");
		return (-1);
	}
	return (0);
}

static int
setopt_reuseaddr(int fd)
{
	return (setopt_int(fd, SOL_SOCKET, SO_REUSEADDR, 1));
}

static int
setopt_anon_mlp(int fd)
{
	return (setopt_int(fd, SOL_SOCKET, SO_ANON_MLP, 1));
}

static int
setup_callit(int fd)
{
	struct ipv6_mreq mreq;
	struct t_optmgmt req, resp;
	struct opthdr *opt;
	char reqbuf[ sizeof (struct ipv6_mreq) + 24];
	struct ipv6_mreq *pmreq;

	opt = (struct opthdr *)reqbuf;

	opt->level = IPPROTO_IPV6;
	opt->name = IPV6_ADD_MEMBERSHIP;
	opt->len = sizeof (struct ipv6_mreq);

	/* multicast address */
	(void) inet_pton(AF_INET6, RPCB_MULTICAST_ADDR,
		mreq.ipv6mr_multiaddr.s6_addr);
	mreq.ipv6mr_interface = 0;

	/* insert it into opt */
	pmreq = (struct ipv6_mreq *)&reqbuf[sizeof (struct opthdr)];
	memcpy(pmreq, &mreq, sizeof (struct ipv6_mreq));

	req.flags = T_NEGOTIATE;
	req.opt.len = sizeof (struct opthdr) + opt->len;
	req.opt.buf = (char *)opt;

	resp.flags = 0;
	resp.opt.buf = reqbuf;
	resp.opt.maxlen = sizeof (reqbuf);

	if (t_optmgmt(fd, &req, &resp) < 0 || resp.flags != T_SUCCESS) {
		t_error("t_optmgmt");
		return (-1);
	}
	return (0);
}

static boolean_t
check_hostserv(struct netconfig *nconf, const char *host, const char *serv)
{
	struct nd_hostserv nh;
	struct nd_addrlist *na;
	const char *hostname = host;
	const char *servname = serv;
	int retval;

	if (strcmp(host, HOST_SELF) == 0)
		hostname = "HOST_SELF";
	else if (strcmp(host, HOST_SELF_CONNECT) == 0)
		hostname = "HOST_SELF_CONNECT";

	if (serv[0] == '\0')
		servname = "<any>";

	nh.h_host = (char *)host;
	nh.h_serv = (char *)serv;

	retval = netdir_getbyname(nconf, &nh, &na);
	if (retval != ND_OK || na->n_cnt == 0) {
		if (retval == ND_OK)
			netdir_free(na, ND_ADDRLIST);

		syslog(LOG_ALERT, "netid %s: cannot find an address for host "
		    "%s, service \"%s\"", nconf->nc_netid, hostname, servname);
		if (debugging) {
			(void) fprintf(stderr, "\tnetdir_getbyname for %s, "
			    "service \"%s\" failed\n", hostname, servname);
		}
		return (B_FALSE);
	}
	netdir_free(na, ND_ADDRLIST);

	if (debugging) {
		(void) fprintf(stderr, "\tnetdir_getbyname for %s, service "
		    "service \"%s\" succeeded\n", hostname, servname);
	}
	return (B_TRUE);
}

#define	DEFRPCBIND	"/etc/default/rpcbind"

/* Maximum outstanding syslog requests */
#define	MAXLOG		100
/* Maximum length: the messages generated are fairly short; no hostnames. */
#define	MAXMSG		128

typedef struct logmsg {
	struct logmsg	*log_next;
	int		log_pri;
	char		log_msg[MAXMSG];
} logmsg;

static logmsg *loghead = NULL;
static logmsg **logtailp = &loghead;
static mutex_t logmutex = DEFAULTMUTEX;
static cond_t logcond = DEFAULTCV;
static int logcount = 0;

/*ARGSUSED*/
static void *
logthread(void *arg)
{
	while (1) {
		logmsg *msg;
		(void) mutex_lock(&logmutex);
		while ((msg = loghead) == NULL)
			(void) cond_wait(&logcond, &logmutex);

		loghead = msg->log_next;
		logcount--;
		if (loghead == NULL) {
			logtailp = &loghead;
			logcount = 0;
		}
		(void) mutex_unlock(&logmutex);
		syslog(msg->log_pri, "%s", msg->log_msg);
		free(msg);
	}
	/* NOTREACHED */
}

/*
 * Initialize: read the configuration parameters from the default file.
 */
static void
rpcb_check_init(void)
{
	thread_t tid;
	scf_simple_prop_t *prop;
	uint8_t	*bool;

	if ((prop = scf_simple_prop_get(NULL, NULL, "config",
	    "enable_tcpwrappers")) != NULL) {

		if ((bool = scf_simple_prop_next_boolean(prop)) != NULL) {
			wrap_enabled = (*bool == 0) ? B_FALSE : B_TRUE;
		} else {
			syslog(LOG_ALERT, "enable_tcpwrappers no value %s",
			    scf_strerror(scf_error()));
		}
		scf_simple_prop_free(prop);
	} else {
		syslog(LOG_ALERT, "unable to get enable_tcpwrappers %s",
		    scf_strerror(scf_error()));
	}
	if ((prop = scf_simple_prop_get(NULL, NULL, "config",
	    "verbose_logging")) != NULL) {

		if ((bool = scf_simple_prop_next_boolean(prop)) != NULL) {
			verboselog = (*bool == 0) ? B_FALSE : B_TRUE;
		} else {
			syslog(LOG_ALERT, "verboselog no value %s",
			    scf_strerror(scf_error()));
		}
		scf_simple_prop_free(prop);
	} else {
		syslog(LOG_ALERT, "unable to get verbose_logging %s",
		    scf_strerror(scf_error()));
	}
	if ((prop = scf_simple_prop_get(NULL, NULL, "config",
	    "allow_indirect")) != NULL) {

		if ((bool = scf_simple_prop_next_boolean(prop)) != NULL) {
			allow_indirect = (*bool == 0) ? B_FALSE : B_TRUE;
		} else {
			syslog(LOG_ALERT, "allow_indirect no value %s",
			    scf_strerror(scf_error()));
		}
		scf_simple_prop_free(prop);
	} else {
		syslog(LOG_ALERT, "unable to get allow_indirect %s",
		    scf_strerror(scf_error()));
	}

	if (wrap_enabled)
		(void) thr_create(NULL, 0, logthread, NULL, THR_DETACHED, &tid);
}

/*
 * qsyslog() - queue a request for syslog(); if syslog blocks, the other
 * thread blocks; we make sure we don't run out of memory by allowing
 * only a limited number of outstandig syslog() requests.
 */
void
qsyslog(int pri, const char *fmt, ...)
{
	logmsg *msg = malloc(sizeof (*msg));
	int oldcount;
	va_list ap;

	if (msg == NULL)
		return;

	msg->log_pri = pri;

	va_start(ap, fmt);
	(void) vsnprintf(msg->log_msg, sizeof (msg->log_msg), fmt, ap);
	va_end(ap);

	msg->log_next = NULL;

	(void) mutex_lock(&logmutex);
	oldcount = logcount;
	if (logcount < MAXLOG) {
		logcount++;
		*logtailp = msg;
		logtailp = &msg->log_next;
	} else {
		free(msg);
	}
	(void) mutex_unlock(&logmutex);
	if (oldcount == 0)
		(void) cond_signal(&logcond);
}