xref: /titanic_50/usr/src/cmd/ypcmd/yppush.c (revision 2449e17f82f6097fd2c665b64723e31ceecbeca6)

/*
 * 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.
 */
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 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.
 */


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 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);
}