8322 nl: misleading-indentation

[unleashed/tickless.git] / usr / src / cmd / fs.d / nfs / statd / sm_proc.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2015 Nexenta Systems, Inc.  All rights reserved.
 */

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/*
 * Copyright (c) 2012 by Delphix. All rights reserved.
 */

/*      Copyright (c) 1984, 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.
 */

#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <syslog.h>
#include <rpc/rpc.h>
#include <rpcsvc/sm_inter.h>
#include <rpcsvc/nsm_addr.h>
#include <memory.h>
#include <net/if.h>
#include <sys/sockio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netdir.h>
#include <synch.h>
#include <thread.h>
#include <ifaddrs.h>
#include <errno.h>
#include <assert.h>
#include "sm_statd.h"

static int local_state;         /* fake local sm state */
                                /* client name-to-address translation table */
static name_addr_entry_t *name_addr = NULL;


#define LOGHOST "loghost"

static void delete_mon(char *mon_name, my_id *my_idp);
static void insert_mon(mon *monp);
static void pr_mon(char *);
static int statd_call_lockd(mon *monp, int state);
static int hostname_eq(char *host1, char *host2);
static char *get_system_id(char *hostname);
static void add_aliases(struct hostent *phost);
static void *thr_send_notice(void *);
static void delete_onemon(char *mon_name, my_id *my_idp,
                                mon_entry **monitor_q);
static void send_notice(char *mon_name, int state);
static void add_to_host_array(char *host);
static int in_host_array(char *host);
static void pr_name_addr(name_addr_entry_t *name_addr);

extern int self_check(char *hostname);
extern struct lifconf *getmyaddrs(void);

/* ARGSUSED */
void
sm_stat_svc(sm_name *namep, sm_stat_res *resp)
{

        if (debug)
                (void) printf("proc sm_stat: mon_name = %s\n",
                    namep->mon_name);

        resp->res_stat = stat_succ;
        resp->state = LOCAL_STATE;
}

/* ARGSUSED */
void
sm_mon_svc(mon *monp, sm_stat_res *resp)
{
        mon_id *monidp;
        monidp = &monp->mon_id;

        rw_rdlock(&thr_rwlock);
        if (debug) {
                (void) printf("proc sm_mon: mon_name = %s, id = %d\n",
                    monidp->mon_name, *((int *)monp->priv));
                pr_mon(monp->mon_id.mon_name);
        }

        /* only monitor other hosts */
        if (self_check(monp->mon_id.mon_name) == 0) {
                /* store monitor request into monitor_q */
                insert_mon(monp);
        }

        pr_mon(monp->mon_id.mon_name);
        resp->res_stat = stat_succ;
        resp->state = local_state;
        rw_unlock(&thr_rwlock);
}

/* ARGSUSED */
void
sm_unmon_svc(mon_id *monidp, sm_stat *resp)
{
        rw_rdlock(&thr_rwlock);
        if (debug) {
                (void) printf(
                    "proc sm_unmon: mon_name = %s, [%s, %d, %d, %d]\n",
                    monidp->mon_name, monidp->my_id.my_name,
                    monidp->my_id.my_prog, monidp->my_id.my_vers,
                    monidp->my_id.my_proc);
                pr_mon(monidp->mon_name);
        }

        delete_mon(monidp->mon_name, &monidp->my_id);
        pr_mon(monidp->mon_name);
        resp->state = local_state;
        rw_unlock(&thr_rwlock);
}

/* ARGSUSED */
void
sm_unmon_all_svc(my_id *myidp, sm_stat *resp)
{
        rw_rdlock(&thr_rwlock);
        if (debug)
                (void) printf("proc sm_unmon_all: [%s, %d, %d, %d]\n",
                    myidp->my_name,
                    myidp->my_prog, myidp->my_vers,
                    myidp->my_proc);
        delete_mon(NULL, myidp);
        pr_mon(NULL);
        resp->state = local_state;
        rw_unlock(&thr_rwlock);
}

/*
 * Notifies lockd specified by name that state has changed for this server.
 */
void
sm_notify_svc(stat_chge *ntfp)
{
        rw_rdlock(&thr_rwlock);
        if (debug)
                (void) printf("sm_notify: %s state =%d\n",
                    ntfp->mon_name, ntfp->state);
        send_notice(ntfp->mon_name, ntfp->state);
        rw_unlock(&thr_rwlock);
}

/* ARGSUSED */
void
sm_simu_crash_svc(void *myidp)
{
        int i;
        struct mon_entry *monitor_q;
        int found = 0;

        if (debug)
                (void) printf("proc sm_simu_crash\n");

        /* Only one crash should be running at a time. */
        mutex_lock(&crash_lock);
        if (in_crash != 0) {
                mutex_unlock(&crash_lock);
                return;
        }
        in_crash = 1;
        mutex_unlock(&crash_lock);

        for (i = 0; i < MAX_HASHSIZE; i++) {
                mutex_lock(&mon_table[i].lock);
                monitor_q = mon_table[i].sm_monhdp;
                if (monitor_q != NULL) {
                        mutex_unlock(&mon_table[i].lock);
                        found = 1;
                        break;
                }
                mutex_unlock(&mon_table[i].lock);
        }
        /*
         * If there are entries found in the monitor table,
         * initiate a crash, else zero out the in_crash variable.
         */
        if (found) {
                mutex_lock(&crash_lock);
                die = 1;
                /* Signal sm_try() thread if sleeping. */
                cond_signal(&retrywait);
                mutex_unlock(&crash_lock);
                rw_wrlock(&thr_rwlock);
                sm_crash();
                rw_unlock(&thr_rwlock);
        } else {
                mutex_lock(&crash_lock);
                in_crash = 0;
                mutex_unlock(&crash_lock);
        }
}

/* ARGSUSED */
void
nsmaddrproc1_reg(reg1args *regargs, reg1res *regresp)
{
        nsm_addr_res status;
        name_addr_entry_t *entry;
        char *tmp_n_bytes;
        addr_entry_t *addr;

        rw_rdlock(&thr_rwlock);
        if (debug) {
                int i;

                (void) printf("nap1_reg: fam= %d, name= %s, len= %d\n",
                    regargs->family, regargs->name, regargs->address.n_len);
                (void) printf("address is: ");
                for (i = 0; i < regargs->address.n_len; i++) {
                        (void) printf("%d.",
                            (unsigned char)regargs->address.n_bytes[i]);
                }
                (void) printf("\n");
        }

        /*
         * Locate the entry with the name in the NSM_ADDR_REG request if
         * it exists.  If it doesn't, create a new entry to hold this name.
         * The first time through this code, name_addr starts out as NULL.
         */
        mutex_lock(&name_addrlock);
        for (entry = name_addr; entry; entry = entry->next) {
                if (strcmp(regargs->name, entry->name) == 0) {
                        if (debug) {
                                (void) printf("nap1_reg: matched name %s\n",
                                    entry->name);
                        }
                        break;
                }
        }

        if (entry == NULL) {
                entry = (name_addr_entry_t *)malloc(sizeof (*entry));
                if (entry == NULL) {
                        if (debug) {
                                (void) printf(
                                "nsmaddrproc1_reg: no memory for entry\n");
                        }
                        status = nsm_addr_fail;
                        goto done;
                }

                entry->name = strdup(regargs->name);
                if (entry->name == NULL) {
                        if (debug) {
                                (void) printf(
                                "nsmaddrproc1_reg: no memory for name\n");
                        }
                        free(entry);
                        status = nsm_addr_fail;
                        goto done;
                }
                entry->addresses = NULL;

                /*
                 * Link the new entry onto the *head* of the name_addr
                 * table.
                 *
                 * Note: there is code below in the address maintenance
                 * section that assumes this behavior.
                 */
                entry->next = name_addr;
                name_addr = entry;
        }

        /*
         * Try to match the address in the request; if it doesn't match,
         * add it to the entry's address list.
         */
        for (addr = entry->addresses; addr; addr = addr->next) {
                if (addr->family == (sa_family_t)regargs->family &&
                    addr->ah.n_len == regargs->address.n_len &&
                    memcmp(addr->ah.n_bytes, regargs->address.n_bytes,
                    addr->ah.n_len) == 0) {
                        if (debug) {
                                int i;

                                (void) printf("nap1_reg: matched addr ");
                                for (i = 0; i < addr->ah.n_len; i++) {
                                        (void) printf("%d.",
                                            (unsigned char)addr->ah.n_bytes[i]);
                                }
                                (void) printf(" family %d for name %s\n",
                                    addr->family, entry->name);
                        }
                        break;
                }
        }

        if (addr == NULL) {
                addr = (addr_entry_t *)malloc(sizeof (*addr));
                tmp_n_bytes = (char *)malloc(regargs->address.n_len);
                if (addr == NULL || tmp_n_bytes == NULL) {
                        if (debug) {
                                (void) printf("nap1_reg: no memory for addr\n");
                        }

                        /*
                         * If this name entry was just newly made in the
                         * table, back it out now that we can't register
                         * an address with it anyway.
                         *
                         * Note: we are making an assumption about how
                         * names are added to (the head of) name_addr here.
                         */
                        if (entry == name_addr && entry->addresses == NULL) {
                                name_addr = name_addr->next;
                                free(entry->name);
                                free(entry);
                                if (tmp_n_bytes)
                                        free(tmp_n_bytes);
                                if (addr)
                                        free(addr);
                                status = nsm_addr_fail;
                                goto done;
                        }
                }

                /*
                 * Note:  this check for address family assumes that we
                 *        will get something different here someday for
                 *        other supported address types, such as IPv6.
                 */
                addr->ah.n_len = regargs->address.n_len;
                addr->ah.n_bytes = tmp_n_bytes;
                addr->family = regargs->family;
                if (debug) {
                        if ((addr->family != AF_INET) &&
                            (addr->family != AF_INET6)) {
                                (void) printf(
                                    "nap1_reg: unknown addr family %d\n",
                                    addr->family);
                        }
                }
                (void) memcpy(addr->ah.n_bytes, regargs->address.n_bytes,
                    addr->ah.n_len);

                addr->next = entry->addresses;
                entry->addresses = addr;
        }

        status = nsm_addr_succ;

done:
        regresp->status = status;
        if (debug) {
                pr_name_addr(name_addr);
        }
        mutex_unlock(&name_addrlock);
        rw_unlock(&thr_rwlock);
}

/*
 * Insert an entry into the monitor_q.  Space for the entry is allocated
 * here.  It is then filled in from the information passed in.
 */
static void
insert_mon(mon *monp)
{
        mon_entry *new, *found;
        my_id *my_idp, *nl_idp;
        mon_entry *monitor_q;
        unsigned int hash;
        name_addr_entry_t *entry;
        addr_entry_t *addr;

        /* Allocate entry for new */
        if ((new = (mon_entry *) malloc(sizeof (mon_entry))) == 0) {
                syslog(LOG_ERR,
                    "statd: insert_mon: malloc error on mon %s (id=%d)\n",
                    monp->mon_id.mon_name, *((int *)monp->priv));
                return;
        }

        /* Initialize and copy contents of monp to new */
        (void) memset(new, 0, sizeof (mon_entry));
        (void) memcpy(&new->id, monp, sizeof (mon));

        /* Allocate entry for new mon_name */
        if ((new->id.mon_id.mon_name = strdup(monp->mon_id.mon_name)) == 0) {
                syslog(LOG_ERR,
                    "statd: insert_mon: malloc error on mon %s (id=%d)\n",
                    monp->mon_id.mon_name, *((int *)monp->priv));
                free(new);
                return;
        }


        /* Allocate entry for new my_name */
        if ((new->id.mon_id.my_id.my_name =
            strdup(monp->mon_id.my_id.my_name)) == 0) {
                syslog(LOG_ERR,
                    "statd: insert_mon: malloc error on mon %s (id=%d)\n",
                    monp->mon_id.mon_name, *((int *)monp->priv));
                free(new->id.mon_id.mon_name);
                free(new);
                return;
        }

        if (debug)
                (void) printf("add_mon(%x) %s (id=%d)\n",
                    (int)new, new->id.mon_id.mon_name, *((int *)new->id.priv));

        /*
         * Record the name, and all addresses which have been registered
         * for this name, in the filesystem name space.
         */
        record_name(new->id.mon_id.mon_name, 1);
        if (regfiles_only == 0) {
                mutex_lock(&name_addrlock);
                for (entry = name_addr; entry; entry = entry->next) {
                        if (strcmp(new->id.mon_id.mon_name, entry->name) != 0) {
                                continue;
                        }

                        for (addr = entry->addresses; addr; addr = addr->next) {
                                record_addr(new->id.mon_id.mon_name,
                                    addr->family, &addr->ah);
                        }
                        break;
                }
                mutex_unlock(&name_addrlock);
        }

        SMHASH(new->id.mon_id.mon_name, hash);
        mutex_lock(&mon_table[hash].lock);
        monitor_q = mon_table[hash].sm_monhdp;

        /* If mon_table hash list is empty. */
        if (monitor_q == NULL) {
                if (debug)
                        (void) printf("\nAdding to monitor_q hash %d\n", hash);
                new->nxt = new->prev = NULL;
                mon_table[hash].sm_monhdp = new;
                mutex_unlock(&mon_table[hash].lock);
                return;
        } else {
                found = 0;
                my_idp = &new->id.mon_id.my_id;
                while (monitor_q != NULL)  {
                        /*
                         * This list is searched sequentially for the
                         * tuple (hostname, prog, vers, proc). The tuples
                         * are inserted in the beginning of the monitor_q,
                         * if the hostname is not already present in the list.
                         * If the hostname is found in the list, the incoming
                         * tuple is inserted just after all the tuples with the
                         * same hostname. However, if the tuple matches exactly
                         * with an entry in the list, space allocated for the
                         * new entry is released and nothing is inserted in the
                         * list.
                         */

                        if (str_cmp_unqual_hostname(
                            monitor_q->id.mon_id.mon_name,
                            new->id.mon_id.mon_name) == 0) {
                                /* found */
                                nl_idp = &monitor_q->id.mon_id.my_id;
                                if ((str_cmp_unqual_hostname(my_idp->my_name,
                                    nl_idp->my_name) == 0) &&
                                    my_idp->my_prog == nl_idp->my_prog &&
                                    my_idp->my_vers == nl_idp->my_vers &&
                                    my_idp->my_proc == nl_idp->my_proc) {
                                        /*
                                         * already exists an identical one,
                                         * release the space allocated for the
                                         * mon_entry
                                         */
                                        free(new->id.mon_id.mon_name);
                                        free(new->id.mon_id.my_id.my_name);
                                        free(new);
                                        mutex_unlock(&mon_table[hash].lock);
                                        return;
                                } else {
                                        /*
                                         * mark the last callback that is
                                         * not matching; new is inserted
                                         * after this
                                         */
                                        found = monitor_q;
                                }
                        } else if (found)
                                break;
                        monitor_q = monitor_q->nxt;
                }
                if (found) {
                        /*
                         * insert just after the entry having matching tuple.
                         */
                        new->nxt = found->nxt;
                        new->prev = found;
                        if (found->nxt != NULL)
                                found->nxt->prev = new;
                        found->nxt = new;
                } else {
                        /*
                         * not found, insert in front of list.
                         */
                        new->nxt = mon_table[hash].sm_monhdp;
                        new->prev = (mon_entry *) NULL;
                        if (new->nxt != (mon_entry *) NULL)
                                new->nxt->prev = new;
                        mon_table[hash].sm_monhdp = new;
                }
                mutex_unlock(&mon_table[hash].lock);
                return;
        }
}

/*
 * Deletes a specific monitor name or deletes all monitors with same id
 * in hash table.
 */
static void
delete_mon(char *mon_name, my_id *my_idp)
{
        unsigned int hash;

        if (mon_name != NULL) {
                record_name(mon_name, 0);
                SMHASH(mon_name, hash);
                mutex_lock(&mon_table[hash].lock);
                delete_onemon(mon_name, my_idp, &mon_table[hash].sm_monhdp);
                mutex_unlock(&mon_table[hash].lock);
        } else {
                for (hash = 0; hash < MAX_HASHSIZE; hash++) {
                        mutex_lock(&mon_table[hash].lock);
                        delete_onemon(mon_name, my_idp,
                            &mon_table[hash].sm_monhdp);
                        mutex_unlock(&mon_table[hash].lock);
                }
        }
}

/*
 * Deletes a monitor in list.
 * IF mon_name is NULL, delete all mon_names that have the same id,
 * else delete specific monitor.
 */
void
delete_onemon(char *mon_name, my_id *my_idp, mon_entry **monitor_q)
{

        mon_entry *next, *nl;
        my_id *nl_idp;

        next = *monitor_q;
        while ((nl = next) != NULL) {
                next = next->nxt;
                if (mon_name == NULL || (mon_name != NULL &&
                    str_cmp_unqual_hostname(nl->id.mon_id.mon_name,
                    mon_name) == 0)) {
                        nl_idp = &nl->id.mon_id.my_id;
                        if ((str_cmp_unqual_hostname(my_idp->my_name,
                            nl_idp->my_name) == 0) &&
                            my_idp->my_prog == nl_idp->my_prog &&
                            my_idp->my_vers == nl_idp->my_vers &&
                            my_idp->my_proc == nl_idp->my_proc) {
                                /* found */
                                if (debug)
                                        (void) printf("delete_mon(%x): %s\n",
                                            (int)nl, mon_name ?
                                            mon_name : "<NULL>");
                                /*
                                 * Remove the monitor name from the
                                 * record_q, if id matches.
                                 */
                                record_name(nl->id.mon_id.mon_name, 0);
                                /* if nl is not the first entry on list */
                                if (nl->prev != NULL)
                                        nl->prev->nxt = nl->nxt;
                                else {
                                        *monitor_q = nl->nxt;
                                }
                                if (nl->nxt != NULL)
                                        nl->nxt->prev = nl->prev;
                                free(nl->id.mon_id.mon_name);
                                free(nl_idp->my_name);
                                free(nl);
                        }
                } /* end of if mon */
        }

}
/*
 * Notify lockd of host specified by mon_name that the specified state
 * has changed.
 */
static void
send_notice(char *mon_name, int state)
{
        struct mon_entry *next;
        mon_entry *monitor_q;
        unsigned int hash;
        moninfo_t *minfop;
        mon *monp;

        SMHASH(mon_name, hash);
        mutex_lock(&mon_table[hash].lock);
        monitor_q = mon_table[hash].sm_monhdp;

        next = monitor_q;
        while (next != NULL) {
                if (hostname_eq(next->id.mon_id.mon_name, mon_name)) {
                        monp = &next->id;
                        /*
                         * Prepare the minfop structure to pass to
                         * thr_create(). This structure is a copy of
                         * mon info and state.
                         */
                        if ((minfop =
                            (moninfo_t *)xmalloc(sizeof (moninfo_t))) != NULL) {
                                (void) memcpy(&minfop->id, monp, sizeof (mon));
                                /* Allocate entry for mon_name */
                                if ((minfop->id.mon_id.mon_name =
                                    strdup(monp->mon_id.mon_name)) == 0) {
                                        syslog(LOG_ERR, "statd: send_notice: "
                                            "malloc error on mon %s (id=%d)\n",
                                            monp->mon_id.mon_name,
                                            *((int *)monp->priv));
                                        free(minfop);
                                        continue;
                                }
                                /* Allocate entry for my_name */
                                if ((minfop->id.mon_id.my_id.my_name =
                                    strdup(monp->mon_id.my_id.my_name)) == 0) {
                                        syslog(LOG_ERR, "statd: send_notice: "
                                            "malloc error on mon %s (id=%d)\n",
                                            monp->mon_id.mon_name,
                                            *((int *)monp->priv));
                                        free(minfop->id.mon_id.mon_name);
                                        free(minfop);
                                        continue;
                                }
                                minfop->state = state;
                                /*
                                 * Create detached threads to process each host
                                 * to notify.  If error, print out msg, free
                                 * resources and continue.
                                 */
                                if (thr_create(NULL, NULL, thr_send_notice,
                                    minfop, THR_DETACHED, NULL)) {
                                        syslog(LOG_ERR, "statd: unable to "
                                            "create thread to send_notice to "
                                            "%s.\n", mon_name);
                                        free(minfop->id.mon_id.mon_name);
                                        free(minfop->id.mon_id.my_id.my_name);
                                        free(minfop);
                                        continue;
                                }
                        }
                }
                next = next->nxt;
        }
        mutex_unlock(&mon_table[hash].lock);
}

/*
 * Work thread created to do the actual statd_call_lockd
 */
static void *
thr_send_notice(void *arg)
{
        moninfo_t *minfop;

        minfop = (moninfo_t *)arg;
        if (statd_call_lockd(&minfop->id, minfop->state) == -1) {
                if (debug && minfop->id.mon_id.mon_name)
                        (void) printf("problem with notifying %s failure, "
                            "give up\n", minfop->id.mon_id.mon_name);
        } else {
                if (debug)
                        (void) printf("send_notice: %s, %d notified.\n",
                            minfop->id.mon_id.mon_name, minfop->state);
        }

        free(minfop->id.mon_id.mon_name);
        free(minfop->id.mon_id.my_id.my_name);
        free(minfop);

        thr_exit((void *) 0);
#ifdef lint
        /*NOTREACHED*/
        return ((void *)0);
#endif
}

/*
 * Contact lockd specified by monp.
 */
static int
statd_call_lockd(mon *monp, int state)
{
        enum clnt_stat clnt_stat;
        struct timeval tottimeout;
        struct sm_status stat;
        my_id *my_idp;
        char *mon_name;
        int i;
        int rc = 0;
        CLIENT *clnt;

        mon_name = monp->mon_id.mon_name;
        my_idp = &monp->mon_id.my_id;
        (void) memset(&stat, 0, sizeof (stat));
        stat.mon_name = mon_name;
        stat.state = state;
        for (i = 0; i < 16; i++) {
                stat.priv[i] = monp->priv[i];
        }
        if (debug)
                (void) printf("statd_call_lockd: %s state = %d\n",
                    stat.mon_name, stat.state);

        tottimeout.tv_sec = SM_RPC_TIMEOUT;
        tottimeout.tv_usec = 0;

        clnt = create_client(my_idp->my_name, my_idp->my_prog, my_idp->my_vers,
            "ticotsord", &tottimeout);
        if (clnt == NULL) {
                return (-1);
        }

        clnt_stat = clnt_call(clnt, my_idp->my_proc, xdr_sm_status,
            (char *)&stat, xdr_void, NULL, tottimeout);
        if (debug) {
                (void) printf("clnt_stat=%s(%d)\n",
                    clnt_sperrno(clnt_stat), clnt_stat);
        }
        if (clnt_stat != (int)RPC_SUCCESS) {
                syslog(LOG_WARNING,
                    "statd: cannot talk to lockd at %s, %s(%d)\n",
                    my_idp->my_name, clnt_sperrno(clnt_stat), clnt_stat);
                rc = -1;
        }

        clnt_destroy(clnt);
        return (rc);

}

/*
 * Client handle created.
 */
CLIENT *
create_client(char *host, int prognum, int versnum, char *netid,
    struct timeval *utimeout)
{
        int             fd;
        struct timeval  timeout;
        CLIENT          *client;
        struct t_info   tinfo;

        if (netid == NULL) {
                client = clnt_create_timed(host, prognum, versnum,
                    "netpath", utimeout);
        } else {
                struct netconfig *nconf;

                nconf = getnetconfigent(netid);
                if (nconf == NULL) {
                        return (NULL);
                }

                client = clnt_tp_create_timed(host, prognum, versnum, nconf,
                    utimeout);

                freenetconfigent(nconf);
        }

        if (client == NULL) {
                return (NULL);
        }

        (void) CLNT_CONTROL(client, CLGET_FD, (caddr_t)&fd);
        if (t_getinfo(fd, &tinfo) != -1) {
                if (tinfo.servtype == T_CLTS) {
                        /*
                         * Set time outs for connectionless case
                         */
                        timeout.tv_usec = 0;
                        timeout.tv_sec = SM_CLTS_TIMEOUT;
                        (void) CLNT_CONTROL(client,
                            CLSET_RETRY_TIMEOUT, (caddr_t)&timeout);
                }
        } else
                return (NULL);

        return (client);
}

/*
 * ONLY for debugging.
 * Debug messages which prints out the monitor table information.
 * If name is specified, just print out the hash list corresponding
 * to name, otherwise print out the entire monitor table.
 */
static void
pr_mon(char *name)
{
        mon_entry *nl;
        int hash;

        if (!debug)
                return;

        /* print all */
        if (name == NULL) {
                for (hash = 0; hash < MAX_HASHSIZE; hash++) {
                        mutex_lock(&mon_table[hash].lock);
                        nl = mon_table[hash].sm_monhdp;
                        if (nl == NULL) {
                                (void) printf(
                                    "*****monitor_q = NULL hash %d\n", hash);
                                mutex_unlock(&mon_table[hash].lock);
                                continue;
                        }
                        (void) printf("*****monitor_q:\n ");
                        while (nl != NULL) {
                                (void) printf("%s:(%x), ",
                                    nl->id.mon_id.mon_name, (int)nl);
                                nl = nl->nxt;
                        }
                        mutex_unlock(&mon_table[hash].lock);
                        (void) printf("\n");
                }
        } else { /* print one hash list */
                SMHASH(name, hash);
                mutex_lock(&mon_table[hash].lock);
                nl = mon_table[hash].sm_monhdp;
                if (nl == NULL) {
                        (void) printf("*****monitor_q = NULL hash %d\n", hash);
                } else {
                        (void) printf("*****monitor_q:\n ");
                        while (nl != NULL) {
                                (void) printf("%s:(%x), ",
                                    nl->id.mon_id.mon_name, (int)nl);
                                nl = nl->nxt;
                        }
                        (void) printf("\n");
                }
                mutex_unlock(&mon_table[hash].lock);
        }
}

/*
 * Only for debugging.
 * Dump the host name-to-address translation table passed in `name_addr'.
 */
static void
pr_name_addr(name_addr_entry_t *name_addr)
{
        name_addr_entry_t *entry;
        addr_entry_t *addr;
        struct in_addr ipv4_addr;
        char *ipv6_addr;
        char abuf[INET6_ADDRSTRLEN];

        assert(MUTEX_HELD(&name_addrlock));
        (void) printf("name-to-address translation table:\n");
        for (entry = name_addr; entry != NULL; entry = entry->next) {
                (void) printf("\t%s: ",
                    (entry->name ? entry->name : "(null)"));
                for (addr = entry->addresses; addr; addr = addr->next) {
                        switch (addr->family) {
                        case AF_INET:
                                ipv4_addr = *(struct in_addr *)addr->ah.n_bytes;
                                (void) printf(" %s (fam %d)",
                                    inet_ntoa(ipv4_addr), addr->family);
                                break;
                        case AF_INET6:
                                ipv6_addr = (char *)addr->ah.n_bytes;
                                (void) printf(" %s (fam %d)",
                                    inet_ntop(addr->family, ipv6_addr, abuf,
                                    sizeof (abuf)), addr->family);
                                break;
                        default:
                                return;
                        }
                }
                printf("\n");
        }
}

/*
 * First, try to compare the hostnames as strings.  If the hostnames does not
 * match we might deal with the hostname aliases.  In this case two different
 * aliases for the same machine don't match each other when using strcmp.  To
 * deal with this, the hostnames must be translated into some sort of universal
 * identifier.  These identifiers can be compared.  Universal network addresses
 * are currently used for this identifier because it is general and easy to do.
 * Other schemes are possible and this routine could be converted if required.
 *
 * If it can't find an address for some reason, 0 is returned.
 */
static int
hostname_eq(char *host1, char *host2)
{
        char *sysid1;
        char *sysid2;
        int rv;

        /* Compare hostnames as strings */
        if (host1 != NULL && host2 != NULL && strcmp(host1, host2) == 0)
                return (1);

        /* Try harder if hostnames do not match */
        sysid1 = get_system_id(host1);
        sysid2 = get_system_id(host2);
        if ((sysid1 == NULL) || (sysid2 == NULL))
                rv = 0;
        else
                rv = (strcmp(sysid1, sysid2) == 0);
        free(sysid1);
        free(sysid2);
        return (rv);
}

/*
 * Convert a hostname character string into its network address.
 * A network address is found by searching through all the entries
 * in /etc/netconfig and doing a netdir_getbyname() for each inet
 * entry found.  The netbuf structure returned is converted into
 * a universal address format.
 *
 * If a NULL hostname is given, then the name of the current host
 * is used.  If the hostname doesn't map to an address, a NULL
 * pointer is returned.
 *
 * N.B. the character string returned is allocated in taddr2uaddr()
 * and should be freed by the caller using free().
 */
static char *
get_system_id(char *hostname)
{
        void *hp;
        struct netconfig *ncp;
        struct nd_hostserv service;
        struct nd_addrlist *addrs;
        char *uaddr;
        int rv;

        if (hostname == NULL)
                service.h_host = HOST_SELF;
        else
                service.h_host = hostname;
        service.h_serv = NULL;
        hp = setnetconfig();
        if (hp == (void *) NULL) {
                return (NULL);
        }
        while ((ncp = getnetconfig(hp)) != NULL) {
                if ((strcmp(ncp->nc_protofmly, NC_INET) == 0) ||
                    (strcmp(ncp->nc_protofmly, NC_INET6) == 0)) {
                        addrs = NULL;
                        rv = netdir_getbyname(ncp, &service, &addrs);
                        if (rv != 0) {
                                continue;
                        }
                        if (addrs) {
                                uaddr = taddr2uaddr(ncp, addrs->n_addrs);
                                netdir_free(addrs, ND_ADDRLIST);
                                endnetconfig(hp);
                                return (uaddr);
                        }
                }
                else
                        continue;
        }
        endnetconfig(hp);
        return (NULL);
}

void
merge_hosts(void)
{
        struct lifconf *lifc = NULL;
        int sock = -1;
        struct lifreq *lifrp;
        struct lifreq lifr;
        int n;
        struct sockaddr_in *sin;
        struct sockaddr_in6 *sin6;
        struct sockaddr_storage *sa;
        int af;
        struct hostent *phost;
        char *addr;
        size_t alen;
        int errnum;

        /*
         * This function will enumerate all the interfaces for
         * this platform, then get the hostent for each i/f.
         * With the hostent structure, we can get all of the
         * aliases for the i/f. Then we'll merge all the aliases
         * with the existing host_name[] list to come up with
         * all of the known names for each interface. This solves
         * the problem of a multi-homed host not knowing which
         * name to publish when statd is started. All the aliases
         * will be stored in the array, host_name.
         *
         * NOTE: Even though we will use all of the aliases we
         * can get from the i/f hostent, the receiving statd
         * will still need to handle aliases with hostname_eq.
         * This is because the sender's aliases may not match
         * those of the receiver.
         */
        lifc = getmyaddrs();
        if (lifc == NULL) {
                goto finish;
        }
        lifrp = lifc->lifc_req;
        for (n = lifc->lifc_len / sizeof (struct lifreq); n > 0; n--, lifrp++) {

                (void) strncpy(lifr.lifr_name, lifrp->lifr_name,
                    sizeof (lifr.lifr_name));

                af = lifrp->lifr_addr.ss_family;
                sock = socket(af, SOCK_DGRAM, 0);
                if (sock == -1) {
                        syslog(LOG_ERR, "statd: socket failed\n");
                        goto finish;
                }

                /* If it's the loopback interface, ignore */
                if (ioctl(sock, SIOCGLIFFLAGS, (caddr_t)&lifr) < 0) {
                        syslog(LOG_ERR,
                            "statd: SIOCGLIFFLAGS failed, error: %m\n");
                        goto finish;
                }
                if (lifr.lifr_flags & IFF_LOOPBACK)
                        continue;

                if (ioctl(sock, SIOCGLIFADDR, (caddr_t)&lifr) < 0) {
                        syslog(LOG_ERR,
                            "statd: SIOCGLIFADDR failed, error: %m\n");
                        goto finish;
                }
                sa = (struct sockaddr_storage *)&(lifr.lifr_addr);

                if (sa->ss_family == AF_INET) {
                        sin = (struct sockaddr_in *)&lifr.lifr_addr;
                        addr = (char *)(&sin->sin_addr);
                        alen = sizeof (struct in_addr);
                } else if (sa->ss_family == AF_INET6) {
                        sin6 = (struct sockaddr_in6 *)&lifr.lifr_addr;
                        addr = (char *)(&sin6->sin6_addr);
                        alen = sizeof (struct in6_addr);
                } else {
                        syslog(LOG_WARNING,
                            "unexpected address family (%d)",
                            sa->ss_family);
                        continue;
                }

                phost = getipnodebyaddr(addr, alen, sa->ss_family, &errnum);

                if (phost)
                        add_aliases(phost);
        }
        /*
         * Now, just in case we didn't get them all byaddr,
         * let's look by name.
         */
        phost = getipnodebyname(hostname, AF_INET6, AI_ALL, &errnum);

        if (phost)
                add_aliases(phost);

finish:
        if (sock != -1)
                (void) close(sock);
        if (lifc) {
                free(lifc->lifc_buf);
                free(lifc);
        }
}

/*
 * add_aliases traverses a hostent alias list, compares
 * the aliases to the contents of host_name, and if an
 * alias is not already present, adds it to host_name[].
 */

static void
add_aliases(struct hostent *phost)
{
        char **aliases;

        if (!in_host_array(phost->h_name)) {
                add_to_host_array(phost->h_name);
        }

        if (phost->h_aliases == NULL)
                return;                 /* no aliases to register */

        for (aliases = phost->h_aliases; *aliases != NULL; aliases++) {
                if (!in_host_array(*aliases)) {
                        add_to_host_array(*aliases);
                }
        }
}

/*
 * in_host_array checks if the given hostname exists in the host_name
 * array. Returns 0 if the host doesn't exist, and 1 if it does exist
 */
static int
in_host_array(char *host)
{
        int i;

        if (debug)
                (void) printf("%s ", host);

        if ((strcmp(hostname, host) == 0) || (strcmp(LOGHOST, host) == 0))
                return (1);

        for (i = 0; i < addrix; i++) {
                if (strcmp(host_name[i], host) == 0)
                        return (1);
        }

        return (0);
}

/*
 * add_to_host_array adds a hostname to the host_name array. But if
 * the array is already full, then it first reallocates the array with
 * HOST_NAME_INCR extra elements. If the realloc fails, then it does
 * nothing and leaves host_name the way it was previous to the call.
 */
static void
add_to_host_array(char *host) {

        void *new_block = NULL;

        /* Make sure we don't overrun host_name. */
        if (addrix >= host_name_count) {
                host_name_count += HOST_NAME_INCR;
                new_block = realloc((void *)host_name,
                                    host_name_count*sizeof (char *));
                if (new_block != NULL)
                        host_name = new_block;
                else {
                        host_name_count -= HOST_NAME_INCR;
                        return;
                }
        }

        if ((host_name[addrix] = strdup(host)) != NULL)
                addrix++;
}

/*
 * Compares the unqualified hostnames for hosts. Returns 0 if the
 * names match, and 1 if the names fail to match.
 */
int
str_cmp_unqual_hostname(char *rawname1, char *rawname2)
{
        size_t unq_len1, unq_len2;
        char *domain;

        if (debug) {
                (void) printf("str_cmp_unqual: rawname1= %s, rawname2= %s\n",
                    rawname1, rawname2);
        }

        unq_len1 = strcspn(rawname1, ".");
        unq_len2 = strcspn(rawname2, ".");
        domain = strchr(rawname1, '.');
        if (domain != NULL) {
                if ((strncmp(rawname1, SM_ADDR_IPV4, unq_len1) == 0) ||
                    (strncmp(rawname1, SM_ADDR_IPV6, unq_len1) == 0))
                return (1);
        }

        if ((unq_len1 == unq_len2) &&
            (strncmp(rawname1, rawname2, unq_len1) == 0)) {
                return (0);
        }

        return (1);
}

/*
 * Compares <family>.<address-specifier> ASCII names for hosts.  Returns
 * 0 if the addresses match, and 1 if the addresses fail to match.
 * If the args are indeed specifiers, they should look like this:
 *
 *      ipv4.192.9.200.1 or ipv6.::C009:C801
 */
int
str_cmp_address_specifier(char *specifier1, char *specifier2)
{
        size_t unq_len1, unq_len2;
        char *rawaddr1, *rawaddr2;
        int af1, af2, len;

        if (debug) {
                (void) printf("str_cmp_addr: specifier1= %s, specifier2= %s\n",
                    specifier1, specifier2);
        }

        /*
         * Verify that:
         *      1. The family tokens match;
         *      2. The IP addresses following the `.' are legal; and
         *      3. These addresses match.
         */
        unq_len1 = strcspn(specifier1, ".");
        unq_len2 = strcspn(specifier2, ".");
        rawaddr1 = strchr(specifier1, '.');
        rawaddr2 = strchr(specifier2, '.');

        if (strncmp(specifier1, SM_ADDR_IPV4, unq_len1) == 0) {
                af1 = AF_INET;
                len = 4;
        } else if (strncmp(specifier1, SM_ADDR_IPV6, unq_len1) == 0) {
                af1 = AF_INET6;
                len = 16;
        }
        else
                return (1);

        if (strncmp(specifier2, SM_ADDR_IPV4, unq_len2) == 0)
                af2 = AF_INET;
        else if (strncmp(specifier2, SM_ADDR_IPV6, unq_len2) == 0)
                af2 = AF_INET6;
        else
                return (1);

        if (af1 != af2)
                return (1);

        if (rawaddr1 != NULL && rawaddr2 != NULL) {
                char dst1[16];
                char dst2[16];
                ++rawaddr1;
                ++rawaddr2;

                if (inet_pton(af1, rawaddr1, dst1) == 1 &&
                    inet_pton(af2, rawaddr1, dst2) == 1 &&
                    memcmp(dst1, dst2, len) == 0) {
                        return (0);
                }
        }
        return (1);
}

/*
 * Add IP address strings to the host_name list.
 */
void
merge_ips(void)
{
        struct ifaddrs *ifap, *cifap;
        int error;

        error = getifaddrs(&ifap);
        if (error) {
                syslog(LOG_WARNING, "getifaddrs error: '%s'",
                    strerror(errno));
                return;
        }

        for (cifap = ifap; cifap != NULL; cifap = cifap->ifa_next) {
                struct sockaddr *sa = cifap->ifa_addr;
                char addr_str[INET6_ADDRSTRLEN];
                void *addr = NULL;

                switch (sa->sa_family) {
                case AF_INET: {
                        struct sockaddr_in *sin = (struct sockaddr_in *)sa;

                        /* Skip loopback addresses. */
                        if (sin->sin_addr.s_addr == htonl(INADDR_LOOPBACK)) {
                                continue;
                        }

                        addr = &sin->sin_addr;
                        break;
                }

                case AF_INET6: {
                        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;

                        /* Skip loopback addresses. */
                        if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) {
                                continue;
                        }

                        addr = &sin6->sin6_addr;
                        break;
                }

                default:
                        syslog(LOG_WARNING, "Unknown address family %d for "
                            "interface %s", sa->sa_family, cifap->ifa_name);
                        continue;
                }

                if (inet_ntop(sa->sa_family, addr, addr_str, sizeof (addr_str))
                    == NULL) {
                        syslog(LOG_WARNING, "Failed to convert address into "
                            "string representation for interface '%s' "
                            "address family %d", cifap->ifa_name,
                            sa->sa_family);
                        continue;
                }

                if (!in_host_array(addr_str)) {
                        add_to_host_array(addr_str);
                }
        }

        freeifaddrs(ifap);
}