/*      $NetBSD: lockd.c,v 1.7 2000/08/12 18:08:44 thorpej Exp $        */

/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 1995
 *      A.R. Gordon (andrew.gordon@net-tel.co.uk).  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the FreeBSD project
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: lockd.c,v 1.7 2000/08/12 18:08:44 thorpej Exp $");
#endif

/*
 * main() function for NFS lock daemon.  Most of the code in this
 * file was generated by running rpcgen /usr/include/rpcsvc/nlm_prot.x.
 *
 * The actual program logic is in the file lock_proc.c
 */

#include <sys/param.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/stat.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <syslog.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <libutil.h>
#include <netconfig.h>
#include <netdb.h>

#include <rpc/rpc.h>
#include <rpc/rpc_com.h>
#include <rpcsvc/sm_inter.h>

#include "lockd.h"
#include <rpcsvc/nlm_prot.h>

#define GETPORT_MAXTRY  20      /* Max tries to get a port # */

int             debug_level = 0;        /* 0 = no debugging syslog() calls */
int             _rpcsvcdirty = 0;

int grace_expired;
int nsm_state;
int kernel_lockd;
int kernel_lockd_client;
pid_t client_pid;
struct mon mon_host;
char **hosts, *svcport_str = NULL;
static int      mallocd_svcport = 0;
static int      *sock_fd;
static int      sock_fdcnt;
static int      sock_fdpos;
int nhosts = 0;
int xcreated = 0;
char **addrs;                   /* actually (netid, uaddr) pairs */
int naddrs;                     /* count of how many (netid, uaddr) pairs */
char localhost[] = "localhost";

static int      create_service(struct netconfig *nconf);
static void     complete_service(struct netconfig *nconf, char *port_str);
static void     clearout_service(void);
static void     out_of_mem(void) __dead2;
void    init_nsm(void);
void    usage(void);

void sigalarm_handler(void);

/*
 * XXX move to some header file.
 */
#define _PATH_RPCLOCKDSOCK      "/var/run/rpclockd.sock"

int
main(int argc, char **argv)
{
        int ch, i, s;
        void *nc_handle;
        char *endptr, **hosts_bak;
        struct sigaction sigalarm;
        int grace_period = 30;
        int foreground = 0;
        struct netconfig *nconf;
        int have_v6 = 1;
        int maxrec = RPC_MAXDATASIZE;
        in_port_t svcport = 0;
        int attempt_cnt, port_len, port_pos, ret;
        char **port_list;

        while ((ch = getopt(argc, argv, "d:Fg:h:p:")) != (-1)) {
                switch (ch) {
                case 'd':
                        debug_level = atoi(optarg);
                        if (!debug_level) {
                                usage();
                                /* NOTREACHED */
                        }
                        break;
                case 'F':
                        foreground = 1;
                        break;
                case 'g':
                        grace_period = atoi(optarg);
                        if (!grace_period) {
                                usage();
                                /* NOTREACHED */
                        }
                        break;
                case 'h':
                        ++nhosts;
                        hosts_bak = realloc(hosts, nhosts * sizeof(char *));
                        if (hosts_bak == NULL) {
                                if (hosts != NULL) {
                                        for (i = 0; i < nhosts; i++) 
                                                free(hosts[i]);
                                        free(hosts);
                                        out_of_mem();
                                }
                        }
                        hosts = hosts_bak;
                        hosts[nhosts - 1] = strdup(optarg);
                        if (hosts[nhosts - 1] == NULL) {
                                for (i = 0; i < (nhosts - 1); i++) 
                                        free(hosts[i]);
                                free(hosts);
                                out_of_mem();
                        }
                        break;
                case 'p':
                        endptr = NULL;
                        svcport = (in_port_t)strtoul(optarg, &endptr, 10);
                        if (endptr == NULL || *endptr != '\0' ||
                            svcport == 0 || svcport >= IPPORT_MAX)
                                usage();
                        svcport_str = strdup(optarg);
                        break;
                default:
                        usage();
                        /* NOTREACHED */
                }
        }
        if (geteuid()) { /* This command allowed only to root */
                fprintf(stderr, "Sorry. You are not superuser\n");
                exit(1);
        }

        kernel_lockd = FALSE;
        kernel_lockd_client = FALSE;
        if (modfind("nfslockd") < 0) {
                if (kldload("nfslockd") < 0) {
                        fprintf(stderr, "Unable to load nfslockd(4), "
                            "using userland implementation\n");
                } else {
                        kernel_lockd = TRUE;
                }
        } else {
                kernel_lockd = TRUE;
        }
        if (kernel_lockd) {
                if (getosreldate() >= 800040)
                        kernel_lockd_client = TRUE;
        }

        (void)rpcb_unset(NLM_PROG, NLM_SM, NULL);
        (void)rpcb_unset(NLM_PROG, NLM_VERS, NULL);
        (void)rpcb_unset(NLM_PROG, NLM_VERSX, NULL);
        (void)rpcb_unset(NLM_PROG, NLM_VERS4, NULL);

        /*
         * Check if IPv6 support is present.
         */
        s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
        if (s < 0)
                have_v6 = 0;
        else 
                close(s);

        rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);

        /*
         * If no hosts were specified, add a wildcard entry to bind to
         * INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
         * list.
         */
        if (nhosts == 0) {
                hosts = malloc(sizeof(char *));
                if (hosts == NULL)
                        out_of_mem();

                hosts[0] = strdup("*");
                nhosts = 1;
        } else {
                if (have_v6) {
                        hosts_bak = realloc(hosts, (nhosts + 2) *
                            sizeof(char *));
                        if (hosts_bak == NULL) {
                                for (i = 0; i < nhosts; i++)
                                        free(hosts[i]);
                                free(hosts);
                                out_of_mem();
                        } else
                                hosts = hosts_bak;

                        nhosts += 2;
                        hosts[nhosts - 2] = strdup("::1");
                } else {
                        hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
                        if (hosts_bak == NULL) {
                                for (i = 0; i < nhosts; i++)
                                        free(hosts[i]);

                                free(hosts);
                                out_of_mem();
                        } else {
                                nhosts += 1;
                                hosts = hosts_bak;
                        }
                }
                hosts[nhosts - 1] = strdup("127.0.0.1");
        }

        if (kernel_lockd) {
                if (!kernel_lockd_client) {
                        /*
                         * For the case where we have a kernel lockd but it
                         * doesn't provide client locking, we run a cut-down
                         * RPC service on a local-domain socket. The kernel's
                         * RPC server will pass what it can't handle (mainly
                         * client replies) down to us.
                         */
                        struct sockaddr_un sun;
                        int fd, oldmask;
                        SVCXPRT *xprt;

                        memset(&sun, 0, sizeof sun);
                        sun.sun_family = AF_LOCAL;
                        unlink(_PATH_RPCLOCKDSOCK);
                        strcpy(sun.sun_path, _PATH_RPCLOCKDSOCK);
                        sun.sun_len = SUN_LEN(&sun);
                        fd = socket(AF_LOCAL, SOCK_STREAM, 0);
                        if (!fd) {
                                err(1, "Can't create local lockd socket");
                        }
                        oldmask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
                        if (bind(fd, (struct sockaddr *) &sun, sun.sun_len) < 0) {
                                err(1, "Can't bind local lockd socket");
                        }
                        umask(oldmask);
                        if (listen(fd, SOMAXCONN) < 0) {
                                err(1, "Can't listen on local lockd socket");
                        }
                        xprt = svc_vc_create(fd, RPC_MAXDATASIZE, RPC_MAXDATASIZE);
                        if (!xprt) {
                                err(1, "Can't create transport for local lockd socket");
                        }
                        if (!svc_reg(xprt, NLM_PROG, NLM_VERS4, nlm_prog_4, NULL)) {
                                err(1, "Can't register service for local lockd socket");
                        }
                }

                /*
                 * We need to look up the addresses so that we can
                 * hand uaddrs (ascii encoded address+port strings) to
                 * the kernel.
                 */
                nc_handle = setnetconfig();
                while ((nconf = getnetconfig(nc_handle))) {
                        /* We want to listen only on udp6, tcp6, udp, tcp transports */
                        if (nconf->nc_flag & NC_VISIBLE) {
                                /* Skip if there's no IPv6 support */
                                if (have_v6 == 0 && strcmp(nconf->nc_protofmly, "inet6") == 0) {
                                        /* DO NOTHING */
                                } else {
                                        create_service(nconf);
                                }
                        }
                }
                endnetconfig(nc_handle);
        } else {
                attempt_cnt = 1;
                sock_fdcnt = 0;
                sock_fd = NULL;
                port_list = NULL;
                port_len = 0;
                nc_handle = setnetconfig();
                while ((nconf = getnetconfig(nc_handle))) {
                        /* We want to listen only on udp6, tcp6, udp, tcp transports */
                        if (nconf->nc_flag & NC_VISIBLE) {
                                /* Skip if there's no IPv6 support */
                                if (have_v6 == 0 && strcmp(nconf->nc_protofmly, "inet6") == 0) {
                                        /* DO NOTHING */
                                } else {
                                        ret = create_service(nconf);
                                        if (ret == 1)
                                                /* Ignore this call */
                                                continue;
                                        if (ret < 0) {
                                                /*
                                                 * Failed to bind port, so close
                                                 * off all sockets created and
                                                 * try again if the port# was
                                                 * dynamically assigned via
                                                 * bind(2).
                                                 */
                                                clearout_service();
                                                if (mallocd_svcport != 0 &&
                                                    attempt_cnt <
                                                    GETPORT_MAXTRY) {
                                                        free(svcport_str);
                                                        svcport_str = NULL;
                                                        mallocd_svcport = 0;
                                                } else {
                                                        errno = EADDRINUSE;
                                                        syslog(LOG_ERR,
                                                         "bindresvport_sa: %m");
                                                        exit(1);
                                                }
        
                                                /*
                                                 * Start over at the first
                                                 * service.
                                                 */
                                                free(sock_fd);
                                                sock_fdcnt = 0;
                                                sock_fd = NULL;
                                                nc_handle = setnetconfig();
                                                attempt_cnt++;
                                        } else if (mallocd_svcport != 0 &&
                                            attempt_cnt == GETPORT_MAXTRY) {
                                                /*
                                                 * For the last attempt, allow
                                                 * different port #s for each
                                                 * nconf by saving the
                                                 * svcport_str and setting it
                                                 * back to NULL.
                                                 */
                                                port_list = realloc(port_list,
                                                    (port_len + 1) *
                                                    sizeof(char *));
                                                if (port_list == NULL)
                                                        out_of_mem();
                                                port_list[port_len++] =
                                                    svcport_str;
                                                svcport_str = NULL;
                                                mallocd_svcport = 0;
                                        }
                                }
                        }
                }

                /*
                 * Successfully bound the ports, so call complete_service() to
                 * do the rest of the setup on the service(s).
                 */
                sock_fdpos = 0;
                port_pos = 0;
                nc_handle = setnetconfig();
                while ((nconf = getnetconfig(nc_handle))) {
                        /* We want to listen only on udp6, tcp6, udp, tcp transports */
                        if (nconf->nc_flag & NC_VISIBLE) {
                                /* Skip if there's no IPv6 support */
                                if (have_v6 == 0 && strcmp(nconf->nc_protofmly, "inet6") == 0) {
                                        /* DO NOTHING */
                                } else if (port_list != NULL) {
                                        if (port_pos >= port_len) {
                                                syslog(LOG_ERR,
                                                    "too many port#s");
                                                exit(1);
                                        }
                                        complete_service(nconf,
                                            port_list[port_pos++]);
                                } else
                                        complete_service(nconf, svcport_str);
                        }
                }
                endnetconfig(nc_handle);
                free(sock_fd);
                if (port_list != NULL) {
                        for (port_pos = 0; port_pos < port_len; port_pos++)
                                free(port_list[port_pos]);
                        free(port_list);
                }
        }

        /*
         * Note that it is NOT sensible to run this program from inetd - the
         * protocol assumes that it will run immediately at boot time.
         */
        if ((foreground == 0) && daemon(0, 0)) {
                err(1, "cannot fork");
                /* NOTREACHED */
        }

        openlog("rpc.lockd", 0, LOG_DAEMON);
        if (debug_level)
                syslog(LOG_INFO, "Starting, debug level %d", debug_level);
        else
                syslog(LOG_INFO, "Starting");

        sigalarm.sa_handler = (sig_t) sigalarm_handler;
        sigemptyset(&sigalarm.sa_mask);
        sigalarm.sa_flags = SA_RESETHAND; /* should only happen once */
        sigalarm.sa_flags |= SA_RESTART;
        if (sigaction(SIGALRM, &sigalarm, NULL) != 0) {
                syslog(LOG_WARNING, "sigaction(SIGALRM) failed: %s",
                    strerror(errno));
                exit(1);
        }

        if (kernel_lockd) {
                if (!kernel_lockd_client) {
                        init_nsm();
                        client_pid = client_request();

                        /*
                         * Create a child process to enter the kernel and then
                         * wait for RPCs on our local domain socket.
                         */
                        if (!fork())
                                nlm_syscall(debug_level, grace_period,
                                    naddrs, addrs);
                        else
                                svc_run();
                } else {
                        /*
                         * The kernel lockd implementation provides
                         * both client and server so we don't need to
                         * do anything else.
                         */
                        nlm_syscall(debug_level, grace_period, naddrs, addrs);
                }
        } else {
                grace_expired = 0;
                alarm(grace_period);

                init_nsm();

                client_pid = client_request();

                svc_run();              /* Should never return */
        }
        exit(1);
}

/*
 * This routine creates and binds sockets on the appropriate
 * addresses if lockd for user NLM, or perform a lookup of
 * addresses for the kernel to create transports.
 *
 * It gets called one time for each transport.
 *
 * It returns 0 upon success, 1 for ignore the call and -1 to indicate
 * bind failed with EADDRINUSE.
 *
 * Any file descriptors that have been created are stored in sock_fd and
 * the total count of them is maintained in sock_fdcnt.
 */
static int
create_service(struct netconfig *nconf)
{
        struct addrinfo hints, *res = NULL;
        struct sockaddr_in *sin;
        struct sockaddr_in6 *sin6;
        struct __rpc_sockinfo si;
        int aicode;
        int fd;
        int nhostsbak;
        int r;
        u_int32_t host_addr[4];  /* IPv4 or IPv6 */
        int mallocd_res;

        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 */

        /*
         * XXX - using RPC library internal functions.
         */
        if (!__rpc_nconf2sockinfo(nconf, &si)) {
                syslog(LOG_ERR, "cannot get information for %s",
                    nconf->nc_netid);
                return (1);
        }

        /* Get rpc.statd's address on this transport */
        memset(&hints, 0, sizeof hints);
        hints.ai_family = si.si_af;
        hints.ai_socktype = si.si_socktype;
        hints.ai_protocol = si.si_proto;

        /*
         * Bind to specific IPs if asked to
         */
        nhostsbak = nhosts;
        while (nhostsbak > 0) {
                --nhostsbak;
                mallocd_res = 0;
                hints.ai_flags = AI_PASSIVE;

                if (!kernel_lockd) {
                        sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int));
                        if (sock_fd == NULL)
                                out_of_mem();
                        sock_fd[sock_fdcnt++] = -1;     /* Set invalid for now. */

                        /*      
                        * XXX - using RPC library internal functions.
                        */
                        if ((fd = __rpc_nconf2fd(nconf)) < 0) {
                                syslog(LOG_ERR, "cannot create socket for %s",
                                        nconf->nc_netid);
                                continue;
                        }
                }

                switch (hints.ai_family) {
                        case AF_INET:
                                if (inet_pton(AF_INET, hosts[nhostsbak],
                                    host_addr) == 1) {
                                        hints.ai_flags |= AI_NUMERICHOST;
                                } else {
                                        /*
                                         * Skip if we have an AF_INET6 address.
                                         */
                                        if (inet_pton(AF_INET6, hosts[nhostsbak],
                                            host_addr) == 1) {
                                                if (!kernel_lockd)
                                                        close(fd);
                                                continue;
                                        }
                                }
                                break;
                        case AF_INET6:
                                if (inet_pton(AF_INET6, hosts[nhostsbak],
                                    host_addr) == 1) {
                                        hints.ai_flags |= AI_NUMERICHOST;
                                } else {
                                        /*
                                         * Skip if we have an AF_INET address.
                                         */
                                        if (inet_pton(AF_INET, hosts[nhostsbak],
                                            host_addr) == 1) {
                                                if (!kernel_lockd)
                                                        close(fd);
                                                continue;
                                        }
                                }
                                break;
                        default:
                                break;
                }

                /*
                 * If no hosts were specified, just bind to INADDR_ANY
                 */
                if (strcmp("*", hosts[nhostsbak]) == 0) {
                        if (svcport_str == NULL) {
                                if ((res = malloc(sizeof(struct addrinfo))) == NULL)
                                        out_of_mem();
                                mallocd_res = 1;
                                res->ai_flags = hints.ai_flags;
                                res->ai_family = hints.ai_family;
                                res->ai_protocol = hints.ai_protocol;
                                switch (res->ai_family) {
                                        case AF_INET:
                                                sin = malloc(sizeof(struct sockaddr_in));
                                                if (sin == NULL) 
                                                        out_of_mem();
                                                sin->sin_family = AF_INET;
                                                sin->sin_port = htons(0);
                                                sin->sin_addr.s_addr = htonl(INADDR_ANY);
                                                res->ai_addr = (struct sockaddr*) sin;
                                                res->ai_addrlen = (socklen_t)
                                                    sizeof(struct sockaddr_in);
                                                break;
                                        case AF_INET6:
                                                sin6 = malloc(sizeof(struct sockaddr_in6));
                                                if (sin6 == NULL)
                                                        out_of_mem();
                                                sin6->sin6_family = AF_INET6;
                                                sin6->sin6_port = htons(0);
                                                sin6->sin6_addr = in6addr_any;
                                                res->ai_addr = (struct sockaddr*) sin6;
                                                res->ai_addrlen = (socklen_t)
                                                    sizeof(struct sockaddr_in6);
                                                break;
                                        default:
                                                syslog(LOG_ERR,
                                                    "bad address family %d",
                                                    res->ai_family);
                                                exit(1);
                                }
                        } else { 
                                if ((aicode = getaddrinfo(NULL, svcport_str,
                                    &hints, &res)) != 0) {
                                        syslog(LOG_ERR,
                                            "cannot get local address for %s: %s",
                                            nconf->nc_netid,
                                            gai_strerror(aicode));
                                        if (!kernel_lockd)
                                                close(fd);
                                        continue;
                                }
                        }
                } else {
                        if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
                            &hints, &res)) != 0) {
                                syslog(LOG_ERR,
                                    "cannot get local address for %s: %s",
                                    nconf->nc_netid, gai_strerror(aicode));
                                if (!kernel_lockd)
                                        close(fd);
                                continue;
                        }
                }

                if (kernel_lockd) {
                        struct netbuf servaddr;
                        char *uaddr;

                        /*
                         * Look up addresses for the kernel to create transports for.
                         */
                        servaddr.len = servaddr.maxlen = res->ai_addrlen;
                        servaddr.buf = res->ai_addr;
                        uaddr = taddr2uaddr(nconf, &servaddr);

                        addrs = realloc(addrs, 2 * (naddrs + 1) * sizeof(char *));
                        if (!addrs)
                                out_of_mem();
                        addrs[2 * naddrs] = strdup(nconf->nc_netid);
                        addrs[2 * naddrs + 1] = uaddr;
                        naddrs++;
                } else {
                        /* Store the fd. */
                        sock_fd[sock_fdcnt - 1] = fd;

                        /* Now, attempt the bind. */
                        r = bindresvport_sa(fd, res->ai_addr);
                        if (r != 0) {
                                if (errno == EADDRINUSE && mallocd_svcport != 0) {
                                        if (mallocd_res != 0) {
                                                free(res->ai_addr);
                                                free(res);
                                        } else
                                                freeaddrinfo(res);
                                        return (-1);
                                }
                                syslog(LOG_ERR, "bindresvport_sa: %m");
                                exit(1);
                        }

                        if (svcport_str == NULL) {
                                svcport_str = malloc(NI_MAXSERV * sizeof(char));
                                if (svcport_str == NULL)
                                        out_of_mem();
                                mallocd_svcport = 1;

                                if (getnameinfo(res->ai_addr,
                                res->ai_addr->sa_len, NULL, NI_MAXHOST,
                                svcport_str, NI_MAXSERV * sizeof(char),
                                NI_NUMERICHOST | NI_NUMERICSERV))
                                        errx(1, "Cannot get port number");
                        }
                }

                if (mallocd_res != 0) {
                        free(res->ai_addr);
                        free(res);
                } else
                        freeaddrinfo(res);
                res = NULL;
        }
        return (0);
}

/*
 * Called after all the create_service() calls have succeeded, to complete
 * the setup and registration.
 */
static void
complete_service(struct netconfig *nconf, char *port_str)
{
        struct addrinfo hints, *res = NULL;
        struct __rpc_sockinfo si;
        struct netbuf servaddr;
        SVCXPRT *transp = NULL;
        int aicode, fd, nhostsbak;
        int registered = 0;

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

        /*
         * XXX - using RPC library internal functions.
         */
        if (!__rpc_nconf2sockinfo(nconf, &si)) {
                syslog(LOG_ERR, "cannot get information for %s",
                    nconf->nc_netid);
                return;
        }

        nhostsbak = nhosts;
        while (nhostsbak > 0) {
                --nhostsbak;
                if (sock_fdpos >= sock_fdcnt) {
                        /* Should never happen. */
                        syslog(LOG_ERR, "Ran out of socket fd's");
                        return;
                }
                fd = sock_fd[sock_fdpos++];
                if (fd < 0)
                        continue;

                if (nconf->nc_semantics != NC_TPI_CLTS)
                    listen(fd, SOMAXCONN);

                transp = svc_tli_create(fd, nconf, NULL,
                    RPC_MAXDATASIZE, RPC_MAXDATASIZE);

                if (transp != (SVCXPRT *) NULL) {
                        if (!svc_reg(transp, NLM_PROG, NLM_SM, nlm_prog_0,
                            NULL)) 
                                syslog(LOG_ERR,
                                    "can't register %s NLM_PROG, NLM_SM service",
                                    nconf->nc_netid);
                        
                        if (!svc_reg(transp, NLM_PROG, NLM_VERS, nlm_prog_1,
                            NULL)) 
                                syslog(LOG_ERR,
                                    "can't register %s NLM_PROG, NLM_VERS service",
                                    nconf->nc_netid);
                        
                        if (!svc_reg(transp, NLM_PROG, NLM_VERSX, nlm_prog_3,
                            NULL)) 
                                syslog(LOG_ERR,
                                    "can't register %s NLM_PROG, NLM_VERSX service",
                                    nconf->nc_netid);
                        
                        if (!svc_reg(transp, NLM_PROG, NLM_VERS4, nlm_prog_4,
                            NULL)) 
                                syslog(LOG_ERR,
                                    "can't register %s NLM_PROG, NLM_VERS4 service",
                                    nconf->nc_netid);
                        
                } else 
                        syslog(LOG_WARNING, "can't create %s services",
                            nconf->nc_netid);

                if (registered == 0) {
                        registered = 1;
                        memset(&hints, 0, sizeof hints);
                        hints.ai_flags = AI_PASSIVE;
                        hints.ai_family = si.si_af;
                        hints.ai_socktype = si.si_socktype;
                        hints.ai_protocol = si.si_proto;

                        if ((aicode = getaddrinfo(NULL, port_str, &hints,
                            &res)) != 0) {
                                syslog(LOG_ERR, "cannot get local address: %s",
                                    gai_strerror(aicode));
                                exit(1);
                        }

                        servaddr.buf = malloc(res->ai_addrlen);
                        memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
                        servaddr.len = res->ai_addrlen;

                        rpcb_set(NLM_PROG, NLM_SM, nconf, &servaddr);
                        rpcb_set(NLM_PROG, NLM_VERS, nconf, &servaddr);
                        rpcb_set(NLM_PROG, NLM_VERSX, nconf, &servaddr);
                        rpcb_set(NLM_PROG, NLM_VERS4, nconf, &servaddr);

                        xcreated++;
                        freeaddrinfo(res);
                }
        } /* end while */
}

/*
 * Clear out sockets after a failure to bind one of them, so that the
 * cycle of socket creation/binding can start anew.
 */
static void
clearout_service(void)
{
        int i;

        for (i = 0; i < sock_fdcnt; i++) {
                if (sock_fd[i] >= 0) {
                        shutdown(sock_fd[i], SHUT_RDWR);
                        close(sock_fd[i]);
                }
        }
}

void
sigalarm_handler(void)
{

        grace_expired = 1;
}

void
usage(void)
{
        errx(1, "usage: rpc.lockd [-d <debuglevel>]"
            " [-F] [-g <grace period>] [-h <bindip>] [-p <port>]");
}

/*
 * init_nsm --
 *      Reset the NSM state-of-the-world and acquire its state.
 */
void
init_nsm(void)
{
        enum clnt_stat ret;
        my_id id;
        sm_stat stat;
        char name[] = "NFS NLM";

        /*
         * !!!
         * The my_id structure isn't used by the SM_UNMON_ALL call, as far
         * as I know.  Leave it empty for now.
         */
        memset(&id, 0, sizeof(id));
        id.my_name = name;

        /*
         * !!!
         * The statd program must already be registered when lockd runs.
         */
        do {
                ret = callrpc("localhost", SM_PROG, SM_VERS, SM_UNMON_ALL,
                    (xdrproc_t)xdr_my_id, &id, (xdrproc_t)xdr_sm_stat, &stat);
                if (ret == RPC_PROGUNAVAIL) {
                        syslog(LOG_WARNING, "%lu %s", SM_PROG,
                            clnt_sperrno(ret));
                        sleep(2);
                        continue;
                }
                break;
        } while (0);

        if (ret != 0) {
                syslog(LOG_ERR, "%lu %s", SM_PROG, clnt_sperrno(ret));
                exit(1);
        }

        nsm_state = stat.state;

        /* setup constant data for SM_MON calls */
        mon_host.mon_id.my_id.my_name = localhost;
        mon_host.mon_id.my_id.my_prog = NLM_PROG;
        mon_host.mon_id.my_id.my_vers = NLM_SM;
        mon_host.mon_id.my_id.my_proc = NLM_SM_NOTIFY;  /* bsdi addition */
}

/*
 * Out of memory, fatal
 */
void
out_of_mem(void)
{
        syslog(LOG_ERR, "out of memory");
        exit(2);
}