cmd/rpcbind/rpcbind.c

	rpcbind.c revision ff904c117f0def740594af26b7201cd392dc8411
/*
 * 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 = NULL;
    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 = NULL;
    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);
    }
}