cmd/ypcmd/yppush.c

	yppush.c revision ace1a5f11236a072fca1b5e0ea1416a083a9f2aa
/*
 * 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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T
 * All Rights Reserved
 *
 * Portions of this source code were derived from Berkeley
 * 4.3 BSD under license from the Regents of the University of
 * California.
 */

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

#define _SVID_GETTOD
#include    <sys/time.h>
extern int gettimeofday(struct timeval *);

#include    <sys/types.h>
#include    <stdio.h>
#include    <string.h>
#include    <malloc.h>
#include    <errno.h>
#include    <signal.h>
#include    <limits.h>
#include    <stdlib.h>
#include    <unistd.h>
#include    <sys/types.h>
#include    <sys/wait.h>
#include    <sys/stat.h>
#include    <ctype.h>
#include    <dirent.h>
#include    <rpc/rpc.h>
#include    <rpc/nettype.h>
#include    <rpc/rpcb_prot.h>
#include    <rpc/rpcb_clnt.h>
#include    <sys/systeminfo.h>
#include    <sys/select.h>
#include    "ypsym.h"
#include    "ypdefs.h"
#include    "yp_b.h"
#include    "shim.h"
#include    "yptol.h"


#ifdef DEBUG
#undef YPPROG
#define YPPROG ((ulong_t)109999)
#undef YPBINDPROG
#define YPBINDPROG ((ulong_t)109998)
#endif

#define INTER_TRY 12            /* Seconds between tries */
#define PORTMAP_TIME 30         /* Seconds before decide its down */
#define TIMEOUT INTER_TRY*4     /* Total time for timeout */
#define CUR_PAR 4           /* Total  parallal yppushes */
#define MIN_GRACE 25            /* select timeout and minimum grace */
#define GRACE_PERIOD 800        /* Total seconds we'll wait for */
                    /* responses from ypxfrs, yes   */
                    /* virginia yp map transfers    */
                    /* can take a long time, we */
                    /* only worry if the slave  */
                    /* crashes ...          */

USE_YPDBPATH
static char *pusage;
static char *domain = NULL;
static char *host = NULL;
static char my_name[YPMAXPEER +1];
static char default_domain_name[YPMAXDOMAIN];
static char domain_alias[MAXNAMLEN];    /* nickname for domain -    */
                    /*  used in sysv filesystems */
static char map_alias[MAXNAMLEN];   /* nickname for map -       */
                    /*  used in sysv filesystems */
static char *map = NULL;
static bool verbose = FALSE;
static bool onehost = FALSE;
static bool oldxfr = FALSE;
static bool callback_timeout = FALSE;   /* set when a callback times out */
int grace_period = GRACE_PERIOD;
int curpar = CUR_PAR;           /* should be set by other stuff */
static char ypmapname[1024];        /* Used to check for map's existence */

static struct timeval intertry = {
    INTER_TRY,          /* Seconds */
    0               /* Microseconds */
};
static struct timeval timeout = {
    TIMEOUT,            /* Seconds */
    0               /* Microseconds */
};
static SVCXPRT *transport4;
static SVCXPRT *transport6;
struct server {
    struct server *pnext;
    struct dom_binding domb;
    char svc_name[YPMAXPEER+1];
    unsigned long xactid;
    unsigned short state;
    unsigned long status;
    bool oldvers;
    int start_time;
};
#define n_conf dom_binding->ypbind_nconf
#define svc_addr dom_binding->ypbind_svcaddr
static struct server *server_list = (struct server *)NULL;
static struct server *active_list = (struct server *)NULL;

/*  State values for server.state field */

#define SSTAT_INIT 0
#define SSTAT_CALLED 1
#define SSTAT_RESPONDED 2
#define SSTAT_PROGNOTREG 3
#define SSTAT_RPC 4
#define SSTAT_RSCRC 5
#define SSTAT_SYSTEM 6

static char err_usage[] =
"Usage:\n\typpush [-p <par>] [-d <domainname>] [-h <hostname>] [-v] map\n";
static char err_bad_args[] =
    "The %s argument is bad.\n";
static char err_cant_get_kname[] =
    "Can't get %s from system call.\n";
static char err_null_kname[] =
    "The %s hasn't been set on this machine.\n";
static char err_bad_domainname[] = "domainname";
static char err_cant_bind[] =
    "Can't find a yp server for domain %s.  Reason:  %s.\n";
static char err_cant_build_serverlist[] =
    "Can't build server list from map \"ypservers\".  Reason:  %s.\n";
static char err_cant_find_host[] =
    "Can't find host %s in map \"ypservers\".\n";
/*
 * State_duple table.  All messages should take 1 arg - the node name.
 */
struct state_duple {
    int state;
    char *state_msg;
};
static struct state_duple state_duples[] = {
    {SSTAT_INIT, "Internal error trying to talk to %s."},
    {SSTAT_CALLED, "%s has been called."},
    {SSTAT_RESPONDED, "%s (v1 ypserv) sent an old-style request."},
    {SSTAT_PROGNOTREG, "nis server not registered at %s."},
    {SSTAT_RPC, "RPC error to %s:  "},
    {SSTAT_RSCRC, "Local resource allocation failure - can't talk to %s."},
    {SSTAT_SYSTEM, "System error talking to %s:  "},
    {0, (char *)NULL}
};
/*
 * Status_duple table.  No messages should require any args.
 */
static struct status_duple {
    long status;
    char *status_msg;
};
static struct status_duple status_duples[] = {
    {YPPUSH_SUCC, "Map successfully transferred."},
    {YPPUSH_AGE,
        "Transfer not done:  master's version isn't newer."},
    {YPPUSH_NOMAP, "Failed - ypxfr there can't find a server for map."},
    {YPPUSH_NODOM, "Failed - domain isn't supported."},
    {YPPUSH_RSRC, "Failed - local resource allocation failure."},
    {YPPUSH_RPC, "Failed - ypxfr had an RPC failure"},
    {YPPUSH_MADDR, "Failed - ypxfr couldn't get the map master's address."},
    {YPPUSH_YPERR, "Failed - nis server or map format error."},
    {YPPUSH_BADARGS, "Failed - args to ypxfr were bad."},
    {YPPUSH_DBM, "Failed - dbm operation on map failed."},
    {YPPUSH_FILE, "Failed - file I/O operation on map failed"},
    {YPPUSH_SKEW, "Failed - map version skew during transfer."},
    {YPPUSH_CLEAR,
        "Map successfully transferred, but ypxfr \
        couldn't send \"Clear map\" to ypserv "},
    {YPPUSH_FORCE,
        "Failed - no local order number in map - use -f flag to ypxfr."},
    {YPPUSH_XFRERR, "Failed - ypxfr internal error."},
    {YPPUSH_REFUSED, "Failed - Transfer request refused."},
    {YPPUSH_NOALIAS,
        "Failed - System V domain/map alias not in alias file."},
    {0, (char *)NULL}
};
/*
 * rpcerr_duple table
 */
static struct rpcerr_duple {
    enum clnt_stat rpc_stat;
    char *rpc_msg;
};
static struct rpcerr_duple rpcerr_duples[] = {
    {RPC_SUCCESS, "RPC success"},
    {RPC_CANTENCODEARGS, "RPC Can't encode args"},
    {RPC_CANTDECODERES, "RPC Can't decode results"},
    {RPC_CANTSEND, "RPC Can't send"},
    {RPC_CANTRECV, "RPC Can't recv"},
    {RPC_TIMEDOUT, "NIS server registered, but does not respond"},
    {RPC_VERSMISMATCH, "RPC version mismatch"},
    {RPC_AUTHERROR, "RPC auth error"},
    {RPC_PROGUNAVAIL, "RPC remote program unavailable"},
    {RPC_PROGVERSMISMATCH, "RPC program mismatch"},
    {RPC_PROCUNAVAIL, "RPC unknown procedure"},
    {RPC_CANTDECODEARGS, "RPC Can't decode args"},
    {RPC_UNKNOWNHOST, "unknown host"},
    {RPC_RPCBFAILURE, "rpcbind failure (host is down?)"},
    {RPC_PROGNOTREGISTERED, "RPC prog not registered"},
    {RPC_SYSTEMERROR, "RPC system error"},
    {RPC_SUCCESS, (char *)NULL}     /* Duplicate rpc_stat   */
                        /* unused in list-end   */
                        /* entry */
};

static void get_default_domain_name(void);
static void get_command_line_args(int argc, char **argv);
static unsigned short send_message(struct server *ps,
                    unsigned long program, long *err);
static void make_server_list(void);
static void one_host_list(void);
static void add_server(char *sname, int namelen);
static int  generate_callback(unsigned long *program);
static void xactid_seed(unsigned long *xactid);
static void main_loop(unsigned long program);
static void listener_exit(unsigned long program, int stat);
static void listener_dispatch(struct svc_req *rqstp, SVCXPRT *transp);
static void print_state_msg(struct server *s, long e);
static void print_callback_msg(struct server *s);
static void rpcerr_msg(enum clnt_stat e);
static void get_xfr_response(SVCXPRT *transp);

#ifdef SYSVCONFIG
extern void sysvconfig(void);
#endif
extern int yp_getalias(char *key, char *key_alias, int maxlen);
extern int getdomainname(char *, int);

extern struct rpc_createerr rpc_createerr;
extern CLIENT *__yp_clnt_create_rsvdport();

int
main(int argc, char **argv)
{
    unsigned long program;
    struct stat sbuf;

    get_command_line_args(argc, argv);

    if (!domain) {
        get_default_domain_name();
    }

#ifdef SYSVCONFIG
    sysvconfig();
#endif

    if (yp_getalias(domain, domain_alias, NAME_MAX) != 0)
        fprintf(stderr, "domain alias for %s not found\n", domain);
    if (yp_getalias(map, map_alias, MAXALIASLEN) != 0)
        fprintf(stderr, "map alias for %s not found\n", map);

    /* check to see if the map exists in this domain */
    if (is_yptol_mode())
        sprintf(ypmapname, "%s/%s/%s%s.dir", ypdbpath, domain_alias,
                        NTOL_PREFIX, map_alias);
    else
        sprintf(ypmapname, "%s/%s/%s.dir", ypdbpath, domain_alias,
                                map_alias);
    if (stat(ypmapname, &sbuf) < 0) {
        fprintf(stderr, "yppush: Map does not exist.\n");
        exit(1);
    }

    if (onehost) {
        one_host_list();
    } else {
        make_server_list();
    }

    /*
     * All process exits after the call to generate_callback should be
     * through listener_exit(program, status), not exit(status), so the
     * transient server can get unregistered with the portmapper.
     */

    if (!generate_callback(&program)) {
        fprintf(stderr, "Can't set up transient callback server.\n");
    }

    main_loop(program);

    listener_exit(program, 0);

    /* NOTREACHED */
    return (0);
}

/*
 * This does the command line parsing.
 */
static void
get_command_line_args(int argc, char **argv)
{
    pusage = err_usage;
    argv++;

    if (argc < 2) {
        fprintf(stderr, pusage);
        exit(1);
    }

    while (--argc) {
        if ((*argv)[0] == '-') {
            switch ((*argv)[1]) {
            case 'v':
                verbose = TRUE;
                argv++;
                break;
            case 'd':
                if (argc > 1) {
                    argv++;
                    argc--;
                    domain = *argv;
                    argv++;
                    if (((int)strlen(domain)) >
                                YPMAXDOMAIN) {
                        fprintf(stderr,
                            err_bad_args,
                            err_bad_domainname);
                        exit(1);
                    }
                } else {
                    fprintf(stderr, pusage);
                    exit(1);
                }
                break;
            case 'h':
                if (argc > 1) {
                    onehost = TRUE;
                    argv++;
                    argc--;
                    host = *argv;
                    argv++;
                } else {
                    fprintf(stderr, pusage);
                    exit(1);
                }
                break;

            case 'p':

                if (argc > 1) {
                    argv++;
                    argc--;
                    if (sscanf(*argv, "%d", &curpar) != 1) {
                        (void) fprintf(stderr, pusage);
                        exit(1);
                    }
                    argv++;
                    if (curpar < 1) {
                        (void) fprintf(stderr, pusage);
                        exit(1);
                    }
                } else {
                    (void) fprintf(stderr, pusage);
                    exit(1);
                }
                break;

            default:
                fprintf(stderr, pusage);
                exit(1);
            }
        } else {
            if (!map) {
                map = *argv;
            } else {
                fprintf(stderr, pusage);
                exit(1);
            }
            argv++;
        }
    }

    if (!map) {
        fprintf(stderr, pusage);
        exit(1);
    }
}

/*
 *  This gets the local kernel domainname, and sets the global domain to it.
 */
static void
get_default_domain_name(void)
{
    if (!getdomainname(default_domain_name, YPMAXDOMAIN)) {
        domain = default_domain_name;
    } else {
        fprintf(stderr, err_cant_get_kname, err_bad_domainname);
        exit(1);
    }

    if ((int)strlen(domain) == 0) {
        fprintf(stderr, err_null_kname, err_bad_domainname);
        exit(1);
    }
}

/*
 * This verifies that the hostname supplied by the user is in the map
 * "ypservers" then calls add_server to make it the only entry on the
 * list of servers.
 */
static void
one_host_list(void)
{
    char *key;
    int keylen;
    char *val;
    int vallen;
    int err;
    char *ypservers = "ypservers";

    if (verbose) {
        printf("Verifying YP server: %s\n", host);
        fflush(stdout);
    }

    if (err = yp_bind(domain_alias)) {
        fprintf(stderr, err_cant_bind, domain, yperr_string(err));
        exit(1);
    }

    keylen = strlen(host);

    if (yp_match(domain_alias, ypservers, host, keylen,
            &val, &vallen)) {
        fprintf(stderr, err_cant_find_host, host);
        exit(1);
    }

    add_server(host, keylen);
}

/*
 * This uses yp operations to retrieve each server name in the map
 *  "ypservers".  add_server is called for each one to add it to the list of
 *  servers.
 */
static void
make_server_list(void)
{
    char *key;
    int keylen;
    char *outkey;
    int outkeylen;
    char *val;
    int vallen;
    int err;
    char *ypservers = "ypservers";
    int count;

    if (verbose) {
        printf("Finding YP servers: ");
        fflush(stdout);
        count = 4;
    }

    if (err = yp_bind(domain_alias)) {
        fprintf(stderr, err_cant_bind, domain, yperr_string(err));
        exit(1);
    }

    if (err = yp_first(domain_alias, ypservers, &outkey, &outkeylen,
                &val, &vallen)) {
        fprintf(stderr, err_cant_build_serverlist, yperr_string(err));
        exit(1);
    }

    for (;;) {
        add_server(outkey, outkeylen);
        if (verbose) {
            printf(" %s", outkey);
            fflush(stdout);
            if (count++ == 8) {
                printf("\n");
                count = 0;
            }
        }
        free(val);
        key = outkey;
        keylen = outkeylen;

        if (err = yp_next(domain_alias, ypservers, key, keylen,
                &outkey, &outkeylen, &val, &vallen)) {

            if (err == YPERR_NOMORE) {
            break;
            } else {
            fprintf(stderr, err_cant_build_serverlist,
                yperr_string(err));
            exit(1);
            }
        }

        free(key);
    }
    if (count != 0) {
        if (verbose)
            printf("\n");
    }
}

/*
 *  This adds a single server to the server list.
 */
static void
add_server(char *sname, int namelen)
{
    struct server *ps;
    static unsigned long seq;
    static unsigned long xactid = 0;

    if (strcmp(sname, my_name) == 0)
        return;

    if (xactid == 0) {
        xactid_seed(&xactid);
    }

    if ((ps = (struct server *)malloc((unsigned)sizeof (struct server)))
        == (struct server *)NULL) {
        perror("yppush: malloc failure");
        exit(1);
    }

    sname[namelen] = '\0';
    strcpy(ps->svc_name, sname);
    ps->state = SSTAT_INIT;
    ps->status = 0;
    ps->oldvers = FALSE;
    ps->xactid = xactid + seq++;
    ps->pnext = server_list;
    server_list = ps;
}

/*
 * This sets the base range for the transaction ids used in speaking the the
 *  server ypxfr processes.
 */
static void
xactid_seed(unsigned long *xactid)
{
    struct timeval t;

    if (gettimeofday(&t) == -1) {
        perror("yppush gettimeofday failure");
        *xactid = 1234567;
    } else {
        *xactid = t.tv_sec;
    }
}

/*
 *  This generates the channel which will be used as the listener process'
 *  service rendezvous point, and comes up with a transient program number
 *  for the use of the RPC messages from the ypxfr processes.
 */
static int
generate_callback(unsigned long *program)
{
    unsigned long prognum = 0x40000000, maxprognum;
    union {
        unsigned long   p;
        unsigned char   b[sizeof (unsigned long)];
    } u;
    int ret, i;
    struct netconfig *nc4, *nc6, *nc;
    SVCXPRT *trans;

    nc4 = getnetconfigent("udp");
    nc6 = getnetconfigent("udp6");
    if (nc4 == 0 && nc6 == 0) {
        fprintf(stderr,
            "yppush: Could not get udp or udp6 netconfig entry\n");
        exit(1);
    }

    transport4 = (nc4 == 0) ? 0 : svc_tli_create(RPC_ANYFD, nc4, 0, 0, 0);
    transport6 = (nc6 == 0) ? 0 : svc_tli_create(RPC_ANYFD, nc6, 0, 0, 0);
    if (transport4 == 0 && transport6 == 0) {
        fprintf(stderr, "yppush: Could not create server handle(s)\n");
        exit(1);
    }

    /* Find the maximum possible program number using an unsigned long */
    for (i = 0; i < sizeof (u.b); i++)
        u.b[i] = 0xff;
    maxprognum = u.p;

    if (transport4 != 0) {
        trans = transport4;
        nc = nc4;
    } else {
        trans = transport6;
        nc = nc6;
    }
    while (prognum < maxprognum && (ret =
        rpcb_set(prognum, YPPUSHVERS, nc, &trans->xp_ltaddr)) == 0)
        prognum++;

    if (ret == 0) {
        fprintf(stderr, "yppush: Could not create callback service\n");
        exit(1);
    } else {
        if (trans == transport4 && transport6 != 0) {
            ret = rpcb_set(prognum, YPPUSHVERS, nc6,
                    &transport6->xp_ltaddr);
            if (ret == 0) {
                fprintf(stderr,
            "yppush: Could not create udp6 callback service\n");
                exit(1);
            }
        }
        *program = prognum;
    }

    return (ret);
}

/*
 * This is the main loop. Send messages to each server,
 * and then wait for a response.
 */


add_to_active()
{
    struct server  *ps;
    ps = server_list;
    if (ps == NULL)
        return (0);
    server_list = server_list->pnext;   /* delete from server_list */
    ps->pnext = active_list;
    active_list = ps;
    return (1);
}

delete_active(in)
    struct server  *in;
{
    struct server  *p;
    struct server  *n;
    if (in == active_list) {
        active_list = active_list->pnext;
        return (1);
    }
    p = active_list;
    for (n = active_list; n; n = n->pnext) {
        if (in == n) {
            p->pnext = n->pnext;
            return (0);

        }
        p = n;
    }
    return (-1);
}

void
main_loop(program)
    unsigned long   program;
{
    pollfd_t    *pollset = NULL;
    int     npollfds = 0;
    int     pollret;
    struct server   *ps;
    long        error;
    int     hpar;   /* this times par count */
    int     i;
    int     j;
    int     time_now;
    int     docb;
    int     actives = 0;
    int     dead = 0;

    if (grace_period < MIN_GRACE)
        grace_period = MIN_GRACE;
    if (transport4 != 0) {
        if (!svc_reg(transport4, program, YPPUSHVERS,
                listener_dispatch, 0)) {
            fprintf(stderr,
            "Can't set up transient udp callback server.\n");
        }
    }
    if (transport6 != 0) {
        if (!svc_reg(transport6, program, YPPUSHVERS,
                listener_dispatch, 0)) {
            fprintf(stderr,
            "Can't set up transient udp6 callback server.\n");
        }
    }
    for (;;) {
        time_now = time(0);
        if (server_list == NULL) {
            actives = 0;
            dead = 0;
            for (ps = active_list; ps; ps = ps->pnext)
                if (ps->state == SSTAT_CALLED) {
                    if ((time_now - ps->start_time) <
                                grace_period)
                        actives++;
                    else
                        dead++;
                }
            if (actives == 0) {
                if (verbose) {
                    printf("terminating %d dead\n", dead);
                    fflush(stdout);
                }

                for (ps = active_list; ps; ps = ps->pnext)
                    if (ps->state == SSTAT_CALLED) {
                        if ((time_now - ps->start_time)
                            >= grace_period) {
                            if (verbose) {
                                printf(
            "no response from %s -- grace of %d seconds expired.\n",
            ps->svc_name, grace_period);
                                fflush(stdout);
                            }
                            fprintf(stderr,
            "No response from ypxfr on %s\n", ps->svc_name);
                        }
                    }
                break;
            }
        }
        actives = 0;
        for (ps = active_list; ps; ps = ps->pnext) {
            if (ps->state == SSTAT_CALLED) {
                if ((time_now - ps->start_time)
                        < grace_period) {
                    actives++;

                    if (verbose) {
                        printf(
            "No response yet from ypxfr on %s\n", ps->svc_name);
                        fflush(stdout);
                    }
                }
            } else {
                if (verbose) {
                    printf("Deactivating  %s\n",
                        ps->svc_name);
                    fflush(stdout);
                }
                delete_active(ps);
            }
        }

        /* add someone to the active list keep up with curpar */
        for (i = 0; i < (curpar - actives); i++) {
            if (add_to_active()) {
                ps = active_list;
                ps->state = send_message(ps, program, &error);
                print_state_msg(ps, error);
                if (ps->state != SSTAT_CALLED)
                    delete_active(ps);  /* zorch it */
                else
                    ps->start_time = time(0); /* set time */
            }
        }
        docb = 0;
        for (ps = active_list; ps; ps = ps->pnext)
            if (ps->state == SSTAT_CALLED) {
                docb = 1;
                break;
            }
        if (docb == 0) {
            if (verbose) {
                printf("No one to wait for this pass.\n");
                fflush(stdout);
            }
            continue;   /* try curpar more */
        }

        if (npollfds != svc_max_pollfd) {
            pollset = realloc(pollset,
                    sizeof (pollfd_t) * svc_max_pollfd);
            npollfds = svc_max_pollfd;
        }

        /*
         * Get existing array of pollfd's, should really compress
         * this but it shouldn't get very large (or sparse).
         */
        (void) memcpy(pollset, svc_pollfd,
                    sizeof (pollfd_t) * svc_max_pollfd);

        errno = 0;
        switch (pollret = poll(pollset, npollfds, MIN_GRACE * 1000)) {
            case -1:
            if (errno != EINTR) {
                (void) perror("main loop select");
            }
            break;

            case 0:
            if (verbose) {
                (void) printf("timeout in main loop select.\n");
                fflush(stdout);
            }
            break;

            default:
            svc_getreq_poll(pollset, pollret);
            break;
        }       /* switch */
    }           /* for */
}

/*
 * This does the listener process cleanup and process exit.
 */
static void
listener_exit(unsigned long program, int stat)
{
    svc_unreg(program, YPPUSHVERS);
    exit(stat);
}

/*
 * This is the listener process' RPC service dispatcher.
 */
static void
listener_dispatch(struct svc_req *rqstp, SVCXPRT *transp)
{
    switch (rqstp->rq_proc) {

    case YPPUSHPROC_NULL:
        if (!svc_sendreply(transp, xdr_void, 0)) {
            fprintf(stderr, "Can't reply to rpc call.\n");
        }
        break;

    case YPPUSHPROC_XFRRESP:
        get_xfr_response(transp);
        break;

    default:
        svcerr_noproc(transp);
        break;
    }
}


/*
 *  This dumps a server state message to stdout.  It is called in cases where
 *  we have no expectation of receiving a callback from the remote ypxfr.
 */
static void
print_state_msg(struct server *s, long e)
{
    struct state_duple *sd;

    if (s->state == SSTAT_SYSTEM)
        return;         /* already printed */

    if (!verbose && (s->state == SSTAT_RESPONDED ||
                s->state == SSTAT_CALLED))
        return;

    for (sd = state_duples; sd->state_msg; sd++) {
        if (sd->state == s->state) {
            printf(sd->state_msg, s->svc_name);

            if (s->state == SSTAT_RPC) {
                rpcerr_msg((enum clnt_stat) e);
            }

            printf("\n");
            fflush(stdout);
            return;
        }
    }

    fprintf(stderr, "yppush: Bad server state value %d.\n", s->state);
}

/*
 *  This dumps a transfer status message to stdout.  It is called in
 *  response to a received RPC message from the called ypxfr.
 */
static void
print_callback_msg(struct server *s)
{
    register struct status_duple *sd;

    if (!verbose &&
        (s->status == YPPUSH_AGE) ||
        (s->status == YPPUSH_SUCC))

        return;

    for (sd = status_duples; sd->status_msg; sd++) {

        if (sd->status == s->status) {
            printf("Status received from ypxfr on %s:\n\t%s\n",
                s->svc_name, sd->status_msg);
            fflush(stdout);
            return;
        }
    }

    fprintf(stderr, "yppush listener: Garbage transaction "
            "status (value %d) from ypxfr on %s.\n",
            (int)s->status, s->svc_name);
}

/*
 *  This dumps an RPC error message to stdout.  This is basically a rewrite
 *  of clnt_perrno, but writes to stdout instead of stderr.
 */
static void
rpcerr_msg(enum clnt_stat e)
{
    struct rpcerr_duple *rd;

    for (rd = rpcerr_duples; rd->rpc_msg; rd++) {

        if (rd->rpc_stat == e) {
            printf(rd->rpc_msg);
            return;
        }
    }

    fprintf(stderr, "Bad error code passed to rpcerr_msg: %d.\n", e);
}

/*
 * This picks up the response from the ypxfr process which has been started
 * up on the remote node.  The response status must be non-zero, otherwise
 * the status will be set to "ypxfr error".
 */
static void
get_xfr_response(SVCXPRT *transp)
{
    struct yppushresp_xfr resp;
    register struct server *s;

    if (!svc_getargs(transp, (xdrproc_t)xdr_yppushresp_xfr,
            (caddr_t)&resp)) {
        svcerr_decode(transp);
        return;
    }

    if (!svc_sendreply(transp, xdr_void, 0)) {
        (void) fprintf(stderr, "Can't reply to rpc call.\n");
    }

    for (s = active_list; s; s = s->pnext) {

        if (s->xactid == resp.transid) {
            s->status  = resp.status ? resp.status: YPPUSH_XFRERR;
            print_callback_msg(s);
            s->state = SSTAT_RESPONDED;
            return;
        }
    }
}

/*
 * This sends a message to a single ypserv process.  The return value is
 * a state value.  If the RPC call fails because of a version
 * mismatch, we'll assume that we're talking to a version 1 ypserv process,
 * and will send him an old "YPPROC_GET" request, as was defined in the
 * earlier version of yp_prot.h
 */
static unsigned short
send_message(struct server *ps, unsigned long program, long *err)
{
    struct ypreq_newxfr req;
    struct ypreq_xfr oldreq;
    enum clnt_stat s;
    struct rpc_err rpcerr;

    if ((ps->domb.dom_client = __yp_clnt_create_rsvdport(ps->svc_name,
                            YPPROG, YPVERS,
                            (char *)NULL,
                            0, 0))  == NULL) {

        if (rpc_createerr.cf_stat == RPC_PROGNOTREGISTERED) {
            return (SSTAT_PROGNOTREG);
        } else {
            printf("Error talking to %s: ", ps->svc_name);
            rpcerr_msg(rpc_createerr.cf_stat);
            printf("\n");
            fflush(stdout);
            return (SSTAT_SYSTEM);
        }
    }

    if (sysinfo(SI_HOSTNAME, my_name, sizeof (my_name)) == -1) {
        return (SSTAT_RSCRC);
    }

    if (!oldxfr) {
        req.ypxfr_domain = domain;
        req.ypxfr_map = map;
        req.ypxfr_ordernum = 0;
        req.ypxfr_owner = my_name;
        req.name = ps->svc_name;
        /*
         * the creation of field req.name, instead of ypreq_xfr (old)
         * req.port, does not make any sense. it doesn't give any
         * information to receiving ypserv except its own name !!
         * new ypserv duplicates work for YPPROC_XFR and YPPROC_NEWXFR
         */
        req.transid = ps->xactid;
        req.proto = program;
        s = (enum clnt_stat) clnt_call(ps->domb.dom_client,
                        YPPROC_NEWXFR,
                        (xdrproc_t)xdr_ypreq_newxfr,
                        (caddr_t)&req,
                        xdr_void, 0, timeout);
    }

    clnt_geterr(ps->domb.dom_client, &rpcerr);

    if (s == RPC_PROCUNAVAIL) {
        oldreq.ypxfr_domain = domain;
        oldreq.ypxfr_map = map;
        oldreq.ypxfr_ordernum = 0;
        oldreq.ypxfr_owner = my_name;
        oldreq.transid = ps->xactid;
        oldreq.proto = program;
        oldreq.port = 0;
        s = (enum clnt_stat) clnt_call(ps->domb.dom_client,
                        YPPROC_XFR,
                        (xdrproc_t)xdr_ypreq_xfr,
                        (caddr_t)&oldreq,
                        xdr_void, 0, timeout);
        clnt_geterr(ps->domb.dom_client, &rpcerr);
    }

    clnt_destroy(ps->domb.dom_client);

    if (s == RPC_SUCCESS) {
        return (SSTAT_CALLED);
    } else {
        *err = (long)rpcerr.re_status;
        return (SSTAT_RPC);
    }
    /*NOTREACHED*/
}

/*
 * FUNCTION:    is_yptol_mode();
 *
 * DESCRIPTION: Determines if we should run in N2L or traditional mode based
 *              on the presence of the N2L mapping file.
 *
 *      This is a copy of a function from libnisdb. If more than this
 *      one function become required it may be worth linking the
 *      entire lib.
 *
 * INPUTS:      Nothing
 *
 * OUTPUTS:     TRUE = Run in N2L mode
 *              FALSE = Run in traditional mode.
 */
bool_t
is_yptol_mode()
{
    struct stat filestat;

    if (stat(NTOL_MAP_FILE, &filestat) != -1)
        return (TRUE);

    return (FALSE);
}