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

#include <sys/cdefs.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/param.h>
#include <rpc/rpc.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include "ypxfr_extern.h"

const char *
ypxfrerr_string(ypxfrstat code)
{
        switch (code) {
        case YPXFR_SUCC:
                return ("Map successfully transferred");
                break;
        case YPXFR_AGE:
                return ("Master's version not newer");
                break;
        case YPXFR_NOMAP:
                return ("No such map in server's domain");
                break;
        case YPXFR_NODOM:
                return ("Domain not supported by server");
                break;
        case YPXFR_RSRC:
                return ("Local resource allocation failure");
                break;
        case YPXFR_RPC:
                return ("RPC failure talking to server");
                break;
        case YPXFR_MADDR:
                return ("Could not get master server address");
                break;
        case YPXFR_YPERR:
                return ("NIS server/map database error");
                break;
        case YPXFR_BADARGS:
                return ("Request arguments bad");
                break;
        case YPXFR_DBM:
                return ("Local database operation failed");
                break;
        case YPXFR_FILE:
                return ("Local file I/O operation failed");
                break;
        case YPXFR_SKEW:
                return ("Map version skew during transfer");
                break;
        case YPXFR_CLEAR:
                return ("Couldn't send \"clear\" request to local ypserv");
                break;
        case YPXFR_FORCE:
                return ("No local order number in map -- use -f flag");
                break;
        case YPXFR_XFRERR:
                return ("General ypxfr error");
                break;
        case YPXFR_REFUSED:
                return ("Transfer request refused by ypserv");
                break;
        default:
                return ("Unknown error code");
                break;
        }
}

/*
 * These are wrappers for the usual yp_master() and yp_order() functions.
 * They can use either local yplib functions (the real yp_master() and
 * yp_order()) or do direct RPCs to a specified server. The latter is
 * necessary if ypxfr is run on a machine that isn't configured as an
 * NIS client (this can happen very easily: a given machine need not be
 * an NIS client in order to be an NIS server).
 */

/*
 * Careful: yp_master() returns a pointer to a dynamically allocated
 * buffer. Calling ypproc_master_2() ourselves also returns a pointer
 * to dynamically allocated memory, though this time it's memory
 * allocated by the XDR routines. We have to rememver to free() or
 * xdr_free() the memory as required to avoid leaking memory.
 */
char *
ypxfr_get_master(char *domain, char *map, char *source, const int yplib)
{
        static char mastername[MAXPATHLEN + 2];

        bzero((char *)&mastername, sizeof(mastername));

        if (yplib) {
                int res;
                char *master;
                if ((res = yp_master(domain, map, &master))) {
                        switch (res) {
                        case YPERR_DOMAIN:
                                yp_errno = (enum ypstat)YPXFR_NODOM;
                                break;
                        case YPERR_MAP:
                                yp_errno = (enum ypstat)YPXFR_NOMAP;
                                break;
                        case YPERR_YPERR:
                        default:
                                yp_errno = (enum ypstat)YPXFR_YPERR;
                                break;
                        }
                        return(NULL);
                } else {
                        snprintf(mastername, sizeof(mastername), "%s", master);
                        free(master);
                        return((char *)&mastername);
                }
        } else {
                CLIENT *clnt;
                ypresp_master *resp;
                ypreq_nokey req;

                if ((clnt = clnt_create(source,YPPROG,YPVERS,"udp")) == NULL) {
                        yp_error("%s",clnt_spcreateerror("failed to \
create udp handle to ypserv"));
                        yp_errno = (enum ypstat)YPXFR_RPC;
                        return(NULL);
                }

                req.map = map;
                req.domain = domain;
                if ((resp = ypproc_master_2(&req, clnt)) == NULL) {
                        yp_error("%s",clnt_sperror(clnt,"YPPROC_MASTER \
failed"));
                        clnt_destroy(clnt);
                        yp_errno = (enum ypstat)YPXFR_RPC;
                        return(NULL);
                }
                clnt_destroy(clnt);
                if (resp->stat != YP_TRUE) {
                        switch (resp->stat) {
                        case YP_NODOM:
                                yp_errno = (enum ypstat)YPXFR_NODOM;
                                break;
                        case YP_NOMAP:
                                yp_errno = (enum ypstat)YPXFR_NOMAP;
                                break;
                        case YP_YPERR:
                        default:
                                yp_errno = (enum ypstat)YPXFR_YPERR;
                                break;
                        }
                        return(NULL);
                }
                snprintf(mastername, sizeof(mastername), "%s", resp->peer);
/*              xdr_free(xdr_ypresp_master, (char *)&resp); */
                return((char *)&mastername);
        }
}

unsigned long
ypxfr_get_order(char *domain, char *map, char *source, const int yplib)
{
        if (yplib) {
                unsigned int order;
                int res;
                if ((res = yp_order(domain, map, &order))) {
                        switch (res) {
                        case YPERR_DOMAIN:
                                yp_errno = (enum ypstat)YPXFR_NODOM;
                                break;
                        case YPERR_MAP:
                                yp_errno = (enum ypstat)YPXFR_NOMAP;
                                break;
                        case YPERR_YPERR:
                        default:
                                yp_errno = (enum ypstat)YPXFR_YPERR;
                                break;
                        }
                        return(0);
                } else
                        return(order);
        } else {
                CLIENT *clnt;
                ypresp_order *resp;
                ypreq_nokey req;

                if ((clnt = clnt_create(source,YPPROG,YPVERS,"udp")) == NULL) {
                        yp_error("%s",clnt_spcreateerror("couldn't create \
udp handle to ypserv"));
                        yp_errno = (enum ypstat)YPXFR_RPC;
                        return(0);
                }
                req.map = map;
                req.domain = domain;
                if ((resp = ypproc_order_2(&req, clnt)) == NULL) {
                        yp_error("%s", clnt_sperror(clnt, "YPPROC_ORDER \
failed"));
                        clnt_destroy(clnt);
                        yp_errno = (enum ypstat)YPXFR_RPC;
                        return(0);
                }
                clnt_destroy(clnt);
                if (resp->stat != YP_TRUE) {
                        switch (resp->stat) {
                        case YP_NODOM:
                                yp_errno = (enum ypstat)YPXFR_NODOM;
                                break;
                        case YP_NOMAP:
                                yp_errno = (enum ypstat)YPXFR_NOMAP;
                                break;
                        case YP_YPERR:
                        default:
                                yp_errno = (enum ypstat)YPXFR_YPERR;
                                break;
                        }
                        return(0);
                }
                return(resp->ordernum);
        }
}

int
ypxfr_match(char *server, char *domain, char *map, char *key,
    unsigned long keylen)
{
        ypreq_key ypkey;
        ypresp_val *ypval;
        CLIENT *clnt;
        static char buf[YPMAXRECORD + 2];

        bzero(buf, sizeof(buf));

        if ((clnt = clnt_create(server, YPPROG,YPVERS,"udp")) == NULL) {
                yp_error("failed to create UDP handle: %s",
                                        clnt_spcreateerror(server));
                return(0);
        }

        ypkey.domain = domain;
        ypkey.map = map;
        ypkey.key.keydat_len = keylen;
        ypkey.key.keydat_val = key;

        if ((ypval = ypproc_match_2(&ypkey, clnt)) == NULL) {
                clnt_destroy(clnt);
                yp_error("%s: %s", server,
                                clnt_sperror(clnt,"YPPROC_MATCH failed"));
                return(0);
        }

        clnt_destroy(clnt);

        if (ypval->stat != YP_TRUE) {
                xdr_free((xdrproc_t)xdr_ypresp_val, ypval);
                return(0);
        }

        xdr_free((xdrproc_t)xdr_ypresp_val, ypval);

        return(1);
}