/*
 * 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 2014 Nexenta Systems, Inc.  All rights reserved.
 */
/* 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.
 */

/*
 * This is an implementation of RCPBIND according the RFC 1833: Binding
 * Protocols for ONC RPC Version 2.  The RFC specifies three versions of the
 * binding protocol:
 *
 * 1) RPCBIND Version 3 (Section 2.2.1 of the RFC)
 * 2) RPCBIND, Version 4 (Section 2.2.2 of the RFC)
 * 3) Port Mapper Program Protocol (Section 3 of the RFC)
 *
 * Where the "Port Mapper Program Protocol" is refered as Version 2 of the
 * binding protocol.  The implementation of the Version 2 of the binding
 * protocol is compiled in only in a case the PORTMAP macro is defined (by
 * default it is defined).
 *
 * The implementation is based on top of the networking services library -
 * libnsl(3lib) and uses Automatic MT mode (see rcp_control(3nsl) and
 * svc_run(3nsl) for more details).
 *
 * Usually, when a thread handles an RPCBIND procedure (one that arrived from a
 * client), it obtains the data for the response internally, and immediately
 * sends the response back to the client.  The only exception to this rule are
 * remote (aka indirect) RPC calls, for example RPCBPROC_INDIRECT.  Such
 * procedures are designed to forward the RPC request from the client to some
 * other RPC service specified by the client, wait for the result, and forward
 * the result back to the client.  This is implemented in rpcbproc_callit_com().
 *
 * The response from the other (remote) RPC service is handled in
 * handle_reply(), where the thread waiting in rpcbproc_callit_com() is woken
 * up to finish the handling and to send (forward) the response back to the
 * client.
 *
 * The thread implementing the indirect RPC call might be blocked in the
 * rpcbproc_callit_com() waiting for the response from the other RPC service
 * for very long time.  During this time the thread is unable to handle other
 * RPCBIND requests.  To avoid a case when all threads are waiting in
 * rpcbproc_callit_com() and there is no free thread able to handle other
 * RPCBIND requests, the implementation has reserved eight threads to never be
 * used for the remote RPC calls.  The number of active remote RPC calls is in
 * rpcb_rmtcalls, the upper limit of such calls is in rpcb_rmtcalls_max.
 *
 * In addition to the worker threads described above, there are two other
 * threads.  The logthread() thread is responsible for asynchronous logging to
 * syslog.  The terminate() thread is signal handler responsible for reload of
 * the rpcbind configuration (on SIGHUP), or for gracefully shutting down
 * rpcbind (otherwise).
 *
 * There are two global lists used for holding the information about the
 * registered services: list_rbl is for Version 3 and 4 of the binding
 * protocol, and list_pml is for Version 2.  To protect these lists, two global
 * readers/writer locks are defined and heavily used across the rpcbind
 * implementation: list_rbl_lock protecting list_rbl, and list_pml_lock,
 * protecting list_pml.
 *
 * The defined locking order is: list_rbl_lock first, list_pml_lock second.
 */

#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 <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>
#include <sys/ccompile.h>
#include <zone.h>
#include <ctype.h>
#include <limits.h>
#include <assert.h>

static sigset_t sigwaitset;

static void terminate(void);
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 int setopt_reuseaddr(int);
static int setopt_anon_mlp(int);
static int setup_callit(int);

static void rpcb_check_init(void);

/* Global variables */
int debugging = 0;	/* Tell me what's going on */
static int ipv6flag = 0;
int doabort = 0;	/* When debugging, do an abort on errors */
static int listen_backlog;
static const int reserved_threads = 8;

/*
 * list_rbl_lock protects list_rbl
 * lock order: list_rbl_lock, list_pml_lock
 */
rwlock_t list_rbl_lock = DEFAULTRWLOCK;
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 */

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

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

#ifdef PORTMAP
/*
 * list_pml_lock protects list_pml
 * lock order: list_rbl_lock, list_pml_lock
 */
rwlock_t list_pml_lock = DEFAULTRWLOCK;
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;

static void
block_signals(void)
{
	(void) sigemptyset(&sigwaitset);
	(void) sigaddset(&sigwaitset, SIGINT);
	(void) sigaddset(&sigwaitset, SIGTERM);
	(void) sigaddset(&sigwaitset, SIGQUIT);
	(void) sigaddset(&sigwaitset, SIGHUP);
	(void) sigprocmask(SIG_BLOCK, &sigwaitset, NULL);

	/* ignore other signals that could get sent */
	(void) signal(SIGUSR1, SIG_IGN);
	(void) signal(SIGUSR2, SIG_IGN);
}

int
main(int argc, char *argv[])
{
	struct netconfig *nconf;
	void *nc_handle;	/* Net config handle */
	struct rlimit rl;
	int rpc_svc_fdunlim = 1;
	int rpc_svc_mode = RPC_SVC_MT_AUTO;
	int maxrecsz = RPC_MAXDATASIZE;
	boolean_t can_do_mlp;

	block_signals();

	parseargs(argc, argv);

	if (getrlimit(RLIMIT_NOFILE, &rl) != 0) {
		syslog(LOG_ERR, "getrlimit failed");
	} else {
		rl.rlim_cur = rl.rlim_max;
		if (setrlimit(RLIMIT_NOFILE, &rl) != 0)
			syslog(LOG_ERR, "setrlimit failed");
	}
	(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);
	}

	myzone = getzoneid();

	/*
	 * Set number of file descriptors to unlimited
	 */
	if (!rpc_control(RPC_SVC_USE_POLLFD, &rpc_svc_fdunlim)) {
		syslog(LOG_INFO, "unable to set number of FD to unlimited");
	}

	/*
	 * Tell RPC that we want automatic thread mode.
	 * A new thread will be spawned for each request.
	 */
	if (!rpc_control(RPC_SVC_MTMODE_SET, &rpc_svc_mode)) {
		syslog(LOG_ERR, "unable to set automatic MT mode");
		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");
	}

	{
		/*
		 * 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);
		}
	}

	loopback_dg = "";
	loopback_vc = "";
	loopback_vc_ord = "";
#ifdef PORTMAP
	udptrans = "";
	tcptrans = "";
#endif

	ipv6flag = Is_ipv6present();
	rpcb_check_init();

	nc_handle = setnetconfig(); 	/* open netconfig file */
	if (nc_handle == NULL) {
		syslog(LOG_ERR, "could not read /etc/netconfig");
		exit(1);
	}
	while ((nconf = getnetconfig(nc_handle)) != NULL) {
		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);
	}

	if (warmstart) {
		read_warmstart();
	}

	/* Create terminate signal handler for graceful exit */
	if (thr_create(NULL, 0, (void *(*)(void *))terminate, NULL, 0, NULL)) {
		syslog(LOG_ERR, "Failed to create terminate thread");
		exit(1);
	}

	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);

	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)) != NULL) {
		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;
	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);
	}

	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);
	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
		 */
		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 (nconf->nc_semantics != NC_TPI_CLTS && taddr->qlen != baddr->qlen)
		syslog(LOG_NOTICE, "%s: unable to set listen backlog to %d "
		    "(negotiated: %d)", nconf->nc_netid, taddr->qlen,
		    baddr->qlen);

	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 = svc_tli_create(fd, nconf, baddr, 0, 0);
	if (my_xprt == 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 = malloc(sizeof (PMAPLIST));
		if (pml == 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 = malloc(sizeof (PMAPLIST));
		if (pml == 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 = malloc(sizeof (PMAPLIST));
		if (pml == 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 */
	(void) add_bndlist(nconf, taddr, baddr);

	/*
	 * rmtcall only supported on CLTS transports for now.
	 */
	if (nconf->nc_semantics == NC_TPI_CLTS)
		(void) create_rmtcall_fd(nconf);

	(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 = malloc(sizeof (rpcblist));
	if (rbl == 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);
	if (rbl->rpcb_map.r_addr == NULL)
		rbl->rpcb_map.r_addr = strdup("");
	rbl->rpcb_map.r_owner = strdup(superuser);

	if (rbl->rpcb_map.r_netid == NULL || rbl->rpcb_map.r_addr == NULL ||
	    rbl->rpcb_map.r_owner == NULL) {
		syslog(LOG_ERR, "no memory!");
		exit(1);
	}

	rbl->rpcb_next = list_rbl;	/* Attach to global list */
	list_rbl = rbl;
}

/*
 * Catch the signal and die, if not SIGHUP
 */
static void
terminate(void)
{
	int sig;

	for (;;) {
		sig = sigwait(&sigwaitset);
		if (sig == SIGHUP) {
			rpcb_check_init();
			continue;
		}
		if (sig != -1 || errno != EINTR)
			break;
	}

	syslog(LOG_ERR, "rpcbind terminating on signal %d.", sig);

	rw_wrlock(&list_rbl_lock);
#ifdef PORTMAP
	rw_wrlock(&list_pml_lock);
#endif
	write_warmstart();	/* Dump yourself */

	exit(2);
}

void
rpcbind_abort(void)
{
	/*
	 * We need to hold write locks to make sure
	 * write_warmstart() is executed exactly once
	 */
	rw_wrlock(&list_rbl_lock);
#ifdef PORTMAP
	rw_wrlock(&list_pml_lock);
#endif
	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);
}

static int
convert_int(int *val, char *str)
{
	long lval;

	if (str == NULL || !isdigit(*str))
		return (-1);

	lval = strtol(str, &str, 10);
	if (*str != '\0' || lval > INT_MAX)
		return (-2);

	*val = (int)lval;
	return (0);
}

static int get_smf_iprop(const char *, int, int, int);

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

	listen_backlog = get_smf_iprop("listen_backlog", 64, 1, INT_MAX);

	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 (convert_int(&tmp, optarg) != 0 || tmp < 1) {
				(void) fprintf(stderr, "%s: invalid "
				    "listen_backlog option, using defaults\n",
				    argv[0]);
				break;
			}
			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);
}

/* 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 * __NORETURN
logthread(void *arg)
{
	for (;;) {
		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 */
}

static boolean_t
get_smf_prop(const char *var, boolean_t def_val)
{
	scf_simple_prop_t *prop;
	uint8_t *val;
	boolean_t res = def_val;

	prop = scf_simple_prop_get(NULL, NULL, "config", var);
	if (prop != NULL) {
		if ((val = scf_simple_prop_next_boolean(prop)) != NULL)
			res = (*val == 0) ? B_FALSE : B_TRUE;
		scf_simple_prop_free(prop);
	}

	if (prop == NULL || val == NULL) {
		syslog(LOG_ALERT, "no value for config/%s (%s). "
		    "Using default \"%s\"", var, scf_strerror(scf_error()),
		    def_val ? "true" : "false");
	}

	return (res);
}

static int
get_smf_iprop(const char *var, int def_val, int min, int max)
{
	scf_simple_prop_t *prop;
	int64_t *val;
	int res = def_val;

	prop = scf_simple_prop_get(NULL, NULL, "config", var);
	if (prop != NULL) {
		if ((val = scf_simple_prop_next_integer(prop)) != NULL) {
			if (*val < min || *val > max)
				syslog(LOG_ALERT, "value for config/%s out of "
				    "range. Using default %d", var, def_val);
			else
				res = (int)*val;
		}
		scf_simple_prop_free(prop);
	}

	if (prop == NULL || val == NULL) {
		syslog(LOG_ALERT, "no value for config/%s (%s). "
		    "Using default %d", var, scf_strerror(scf_error()),
		    def_val);
	}

	return (res);
}

/*
 * Initialize: read the configuration parameters from SMF.
 * This function must be idempotent because it can be called from the
 * signal handler.
 */
static void
rpcb_check_init(void)
{
	thread_t tid;
	int max_threads;
	static int thr_running;

	wrap_enabled = get_smf_prop("enable_tcpwrappers", B_FALSE);
	verboselog = get_smf_prop("verbose_logging", B_FALSE);
	allow_indirect = get_smf_prop("allow_indirect", B_TRUE);
	local_only = get_smf_prop("local_only", B_TRUE);

	if (wrap_enabled && !thr_running) {
		(void) thr_create(NULL, 0, logthread, NULL, THR_DETACHED, &tid);
		thr_running = 1;
	}

	/*
	 * Set the maximum number of threads.
	 */
	max_threads = get_smf_iprop("max_threads", 72, 1, INT_MAX);
	if (!rpc_control(RPC_SVC_THRMAX_SET, &max_threads)) {
		int tmp;

		/*
		 * The following rpc_control() call cannot fail
		 */
		if (!rpc_control(RPC_SVC_THRMAX_GET, &tmp))
			assert(0);

		if (tmp != max_threads) {
			syslog(LOG_ERR, "setting max_threads to %d failed, "
			    "using %d worker threads", max_threads, tmp);
			max_threads = tmp;
		}
	}

	/*
	 * Set rpcb_rmtcalls_max.
	 */
	if (max_threads < reserved_threads)
		set_rpcb_rmtcalls_max(0);
	else
		set_rpcb_rmtcalls_max(max_threads - reserved_threads);
}

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