8322 nl: misleading-indentation

[unleashed/tickless.git] / usr / src / cmd / ypcmd / yppush.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 * Copyright 2008 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.
 */
/*
 * Copyright (c) 2016 by Delphix. All rights reserved.
 */
#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.
 */
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
 */
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 stat64 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 (stat64(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.
 */


int
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);
}

int
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 it 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);
}