/*      $OpenBSD: yplib_host.c,v 1.18 2015/01/16 06:40:22 deraadt Exp $ */

/*
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1992, 1993 Theo de Raadt <deraadt@theos.com>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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/param.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/file.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>

#include "yplib_host.h"

extern bool_t xdr_ypresp_all_seq(XDR *, unsigned long *);

extern int (*ypresp_allfn)(u_long, char *, int, char *, int, void *);
extern void *ypresp_data;

static int _yplib_host_timeout = 10;

CLIENT *
yp_bind_host(char *server, u_long program, u_long version, u_short port,
    int usetcp)
{
        struct sockaddr_in rsrv_sin;
        static CLIENT *client;
        struct hostent *h;
        struct timeval tv;
        int rsrv_sock;

        memset(&rsrv_sin, 0, sizeof rsrv_sin);
        rsrv_sin.sin_len = sizeof rsrv_sin;
        rsrv_sin.sin_family = AF_INET;
        rsrv_sock = RPC_ANYSOCK;
        if (port != 0)
                rsrv_sin.sin_port = htons(port);

        if (*server >= '0' && *server <= '9') {
                if (inet_aton(server, &rsrv_sin.sin_addr) == 0) {
                        errx(1, "inet_aton: invalid address %s.",
                            server);
                }
        } else {
                h = gethostbyname(server);
                if (h == NULL) {
                        errx(1, "gethostbyname: unknown host %s.",
                            server);
                }
                rsrv_sin.sin_addr.s_addr = *(u_int32_t *)h->h_addr;
        }

        tv.tv_sec = 10;
        tv.tv_usec = 0;

        if (usetcp)
                client = clnttcp_create(&rsrv_sin, program, version,
                    &rsrv_sock, 0, 0);
        else
                client = clntudp_create(&rsrv_sin, program, version, tv,
                    &rsrv_sock);

        if (client == NULL) {
                errx(1, "clntudp_create: no contact with host %s.",
                    server);
        }

        return (client);
}

CLIENT *
yp_bind_local(u_long program, u_long version)
{
        struct sockaddr_in rsrv_sin;
        static CLIENT *client;
        struct timeval tv;
        int rsrv_sock;

        memset(&rsrv_sin, 0, sizeof rsrv_sin);
        rsrv_sin.sin_len = sizeof rsrv_sin;
        rsrv_sin.sin_family = AF_INET;
        rsrv_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
        rsrv_sock = RPC_ANYSOCK;

        tv.tv_sec = 10;
        tv.tv_usec = 0;

        client = clntudp_create(&rsrv_sin, program, version, tv, &rsrv_sock);
        if (client == NULL) {
                errx(1, "clntudp_create: no contact with localhost.");
        }

        return (client);
}

int
yp_match_host(CLIENT *client, char *indomain, char *inmap, const char *inkey,
    int inkeylen, char **outval, int *outvallen)
{
        struct ypresp_val yprv;
        struct ypreq_key yprk;
        struct timeval tv;
        int r;

        *outval = NULL;
        *outvallen = 0;

        tv.tv_sec = _yplib_host_timeout;
        tv.tv_usec = 0;

        yprk.domain = indomain;
        yprk.map = inmap;
        yprk.key.keydat_val = (char *)inkey;
        yprk.key.keydat_len = inkeylen;

        memset(&yprv, 0, sizeof yprv);

        r = clnt_call(client, YPPROC_MATCH,
            (xdrproc_t)xdr_ypreq_key, &yprk,
            (xdrproc_t)xdr_ypresp_val, &yprv, tv);
        if (r != RPC_SUCCESS)
                clnt_perror(client, "yp_match_host: clnt_call");
        if ( !(r = ypprot_err(yprv.stat)) ) {
                *outvallen = yprv.val.valdat_len;
                *outval = malloc(*outvallen + 1);
                memcpy(*outval, yprv.val.valdat_val, *outvallen);
                (*outval)[*outvallen] = '\0';
        }
        xdr_free((xdrproc_t)xdr_ypresp_val, (char *)&yprv);

        return (r);
}

int
yp_first_host(CLIENT *client, char *indomain, char *inmap, char **outkey,
    int *outkeylen, char **outval, int *outvallen)
{
        struct ypresp_key_val yprkv;
        struct ypreq_nokey yprnk;
        struct timeval tv;
        int r;

        *outkey = *outval = NULL;
        *outkeylen = *outvallen = 0;

        tv.tv_sec = _yplib_host_timeout;
        tv.tv_usec = 0;

        yprnk.domain = indomain;
        yprnk.map = inmap;
        memset(&yprkv, 0, sizeof yprkv);

        r = clnt_call(client, YPPROC_FIRST,
            (xdrproc_t)xdr_ypreq_nokey, &yprnk,
            (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
        if (r != RPC_SUCCESS)
                clnt_perror(client, "yp_first_host: clnt_call");
        if ( !(r = ypprot_err(yprkv.stat)) ) {
                *outkeylen = yprkv.key.keydat_len;
                *outkey = malloc(*outkeylen+1);
                memcpy(*outkey, yprkv.key.keydat_val, *outkeylen);
                (*outkey)[*outkeylen] = '\0';
                *outvallen = yprkv.val.valdat_len;
                *outval = malloc(*outvallen+1);
                memcpy(*outval, yprkv.val.valdat_val, *outvallen);
                (*outval)[*outvallen] = '\0';
        }
        xdr_free((xdrproc_t)xdr_ypresp_key_val, (char *)&yprkv);

        return (r);
}

int
yp_next_host(CLIENT *client, char *indomain, char *inmap, char *inkey,
    int inkeylen, char **outkey, int *outkeylen, char **outval, int *outvallen)
{
        struct ypresp_key_val yprkv;
        struct ypreq_key yprk;
        struct timeval tv;
        int r;

        *outkey = *outval = NULL;
        *outkeylen = *outvallen = 0;

        tv.tv_sec = _yplib_host_timeout;
        tv.tv_usec = 0;

        yprk.domain = indomain;
        yprk.map = inmap;
        yprk.key.keydat_val = inkey;
        yprk.key.keydat_len = inkeylen;
        memset(&yprkv, 0, sizeof yprkv);

        r = clnt_call(client, YPPROC_NEXT,
            (xdrproc_t)xdr_ypreq_key, &yprk,
            (xdrproc_t)xdr_ypresp_key_val, &yprkv, tv);
        if (r != RPC_SUCCESS)
                clnt_perror(client, "yp_next_host: clnt_call");
        if ( !(r = ypprot_err(yprkv.stat)) ) {
                *outkeylen = yprkv.key.keydat_len;
                *outkey = malloc(*outkeylen+1);
                memcpy(*outkey, yprkv.key.keydat_val, *outkeylen);
                (*outkey)[*outkeylen] = '\0';
                *outvallen = yprkv.val.valdat_len;
                *outval = malloc(*outvallen+1);
                memcpy(*outval, yprkv.val.valdat_val, *outvallen);
                (*outval)[*outvallen] = '\0';
        }
        xdr_free((xdrproc_t)xdr_ypresp_key_val, (char *)&yprkv);

        return (r);
}

int
yp_all_host(CLIENT *client, char *indomain, char *inmap,
    struct ypall_callback *incallback)
{
        struct ypreq_nokey yprnk;
        struct timeval tv;
        u_long status;

        tv.tv_sec = _yplib_host_timeout;
        tv.tv_usec = 0;

        yprnk.domain = indomain;
        yprnk.map = inmap;
        ypresp_allfn = incallback->foreach;
        ypresp_data = (void *)incallback->data;

        (void) clnt_call(client, YPPROC_ALL,
            (xdrproc_t)xdr_ypreq_nokey, &yprnk,
            (xdrproc_t)xdr_ypresp_all_seq, &status, tv);
        if (status != YP_FALSE)
                return ypprot_err(status);

        return (0);
}

int
yp_order_host(CLIENT *client, char *indomain, char *inmap, u_int32_t *outorder)
{
        struct ypresp_order ypro;
        struct ypreq_nokey yprnk;
        struct timeval tv;
        int r;

        tv.tv_sec = _yplib_host_timeout;
        tv.tv_usec = 0;

        yprnk.domain = indomain;
        yprnk.map = inmap;

        memset(&ypro, 0, sizeof ypro);

        r = clnt_call(client, YPPROC_ORDER,
            (xdrproc_t)xdr_ypreq_nokey, &yprnk,
            (xdrproc_t)xdr_ypresp_order, &ypro, tv);
        if (r != RPC_SUCCESS)
                clnt_perror(client, "yp_order_host: clnt_call");
        *outorder = ypro.ordernum;
        xdr_free((xdrproc_t)xdr_ypresp_order, (char *)&ypro);

        return ypprot_err(ypro.stat);
}

int
yp_master_host(CLIENT *client, char *indomain, char *inmap, char **outname)
{
        struct ypresp_master yprm;
        struct ypreq_nokey yprnk;
        struct timeval tv;
        int r;

        tv.tv_sec = _yplib_host_timeout;
        tv.tv_usec = 0;
        yprnk.domain = indomain;
        yprnk.map = inmap;

        memset(&yprm, 0, sizeof yprm);

        r = clnt_call(client, YPPROC_MASTER,
            (xdrproc_t)xdr_ypreq_nokey, &yprnk,
            (xdrproc_t)xdr_ypresp_master, &yprm, tv);
        if (r != RPC_SUCCESS)
                clnt_perror(client, "yp_master: clnt_call");
        if (!(r = ypprot_err(yprm.stat)))
                *outname = strdup(yprm.peer);
        xdr_free((xdrproc_t)xdr_ypresp_master, (char *)&yprm);

        return (r);
}

int
yp_maplist_host(CLIENT *client, char *indomain, struct ypmaplist **outmaplist)
{
        struct ypresp_maplist ypml;
        struct timeval tv;
        int r;

        tv.tv_sec = _yplib_host_timeout;
        tv.tv_usec = 0;

        memset(&ypml, 0, sizeof ypml);

        r = clnt_call(client, YPPROC_MAPLIST,
            (xdrproc_t)xdr_domainname, &indomain,
            (xdrproc_t)xdr_ypresp_maplist, &ypml, tv);
        if (r != RPC_SUCCESS)
                clnt_perror(client, "yp_maplist: clnt_call");
        *outmaplist = ypml.maps;
        /* NO: xdr_free(xdr_ypresp_maplist, &ypml);*/

        return ypprot_err(ypml.stat);
}