rpcb_clnt.c

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/*
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - 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.
 * - Neither the name of Sun Microsystems, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT HOLDER 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.
 */
/*
 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 
 */
 
/*
 * rpcb_clnt.c
 * interface to rpcbind rpc service.
 *
 * Copyright (C) 1988, Sun Microsystems, Inc.
 */
#include <wintirpc.h>
//#include <pthread.h>
#include <reentrant.h>
#include <sys/types.h>
//#include <sys/socket.h>
//#include <sys/un.h>
//#include <sys/utsname.h>
#include <rpc/rpc.h>
#include <rpc/rpcb_prot.h>
#include <rpc/nettype.h>
#include <netconfig.h>
#ifdef PORTMAP
//#include <netinet/in.h>       /* FOR IPPROTO_TCP/UDP definitions */
#include <rpc/pmap_prot.h>
#endif              /* PORTMAP */
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
//#include <unistd.h>
//#include <netdb.h>
//#include <syslog.h>
 
#include "rpc_com.h"
 
static struct timeval tottimeout = { 60, 0 };
static const struct timeval rmttimeout = { 3, 0 };
static struct timeval rpcbrmttime = { 15, 0 };
 
extern bool_t xdr_wrapstring(XDR *, char **);
 
static const char nullstring[] = "\000";
 
#define RPCB_OWNER_STRING "libtirpc"
 
#define CACHESIZE 6
 
struct address_cache {
    char *ac_host;
    char *ac_netid;
    char *ac_uaddr;
    struct netbuf *ac_taddr;
    struct address_cache *ac_next;
};
 
static struct address_cache *front;
static int cachesize;
 
#define CLCR_GET_RPCB_TIMEOUT   1
#define CLCR_SET_RPCB_TIMEOUT   2
 
 
extern int __rpc_lowvers;
 
static struct address_cache *check_cache(const char *, const char *);
static void delete_cache(struct netbuf *);
static void add_cache(const char *, const char *, struct netbuf *, char *);
static CLIENT *getclnthandle(const char *, const struct netconfig *, char **);
static CLIENT *local_rpcb(void);
#ifdef NOTUSED
static struct netbuf *got_entry(rpcb_entry_list_ptr, const struct netconfig *);
#endif
 
/*
 * This routine adjusts the timeout used for calls to the remote rpcbind.
 * Also, this routine can be used to set the use of portmapper version 2
 * only when doing rpc_broadcasts
 * These are private routines that may not be provided in future releases.
 */
bool_t
__rpc_control(request, info)
    int request;
    void    *info;
{
    switch (request) {
    case CLCR_GET_RPCB_TIMEOUT:
        *(struct timeval *)info = tottimeout;
        break;
    case CLCR_SET_RPCB_TIMEOUT:
        tottimeout = *(struct timeval *)info;
        break;
    case CLCR_SET_LOWVERS:
        __rpc_lowvers = *(int *)info;
        break;
    case CLCR_GET_LOWVERS:
        *(int *)info = __rpc_lowvers;
        break;
    default:
        return (FALSE);
    }
    return (TRUE);
}
 
/*
 *  It might seem that a reader/writer lock would be more reasonable here.
 *  However because getclnthandle(), the only user of the cache functions,
 *  may do a delete_cache() operation if a check_cache() fails to return an
 *  address useful to clnt_tli_create(), we may as well use a mutex.
 */
/*
 * As it turns out, if the cache lock is *not* a reader/writer lock, we will
 * block all clnt_create's if we are trying to connect to a host that's down,
 * since the lock will be held all during that time.
 */
extern rwlock_t rpcbaddr_cache_lock;
 
/*
 * The routines check_cache(), add_cache(), delete_cache() manage the
 * cache of rpcbind addresses for (host, netid).
 */
 
static struct address_cache *
check_cache(host, netid)
    const char *host, *netid;
{
    struct address_cache *cptr;
 
    /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
 
    for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
        if (!strcmp(cptr->ac_host, host) &&
            !strcmp(cptr->ac_netid, netid)) {
#ifdef ND_DEBUG
            fprintf(stderr, "Found cache entry for %s: %s\n",
                host, netid);
#endif
            return (cptr);
        }
    }
    return ((struct address_cache *) NULL);
}
 
static void
delete_cache(addr)
    struct netbuf *addr;
{
    struct address_cache *cptr, *prevptr = NULL;
 
    /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
    for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
        if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) {
            free(cptr->ac_host);
            free(cptr->ac_netid);
            free(cptr->ac_taddr->buf);
            free(cptr->ac_taddr);
            if (cptr->ac_uaddr)
                free(cptr->ac_uaddr);
            if (prevptr)
                prevptr->ac_next = cptr->ac_next;
            else
                front = cptr->ac_next;
            free(cptr);
            cachesize--;
            break;
        }
        prevptr = cptr;
    }
}
 
static void
add_cache(host, netid, taddr, uaddr)
    const char *host, *netid;
    char *uaddr;
    struct netbuf *taddr;
{
    struct address_cache  *ad_cache, *cptr, *prevptr;
 
    ad_cache = (struct address_cache *)
            malloc(sizeof (struct address_cache));
    if (!ad_cache) {
        return;
    }
    ad_cache->ac_host = strdup(host);
    ad_cache->ac_netid = strdup(netid);
    ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL;
    ad_cache->ac_taddr = (struct netbuf *)malloc(sizeof (struct netbuf));
    if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr ||
        (uaddr && !ad_cache->ac_uaddr)) {
        return;
    }
    ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len;
    ad_cache->ac_taddr->buf = (char *) malloc(taddr->len);
    if (ad_cache->ac_taddr->buf == NULL) {
        return;
    }
    memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len);
#ifdef ND_DEBUG
    fprintf(stderr, "Added to cache: %s : %s\n", host, netid);
#endif
 
/* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  cptr */
 
    rwlock_wrlock(&rpcbaddr_cache_lock);
    if (cachesize < CACHESIZE) {
        ad_cache->ac_next = front;
        front = ad_cache;
        cachesize++;
    } else {
        /* Free the last entry */
        cptr = front;
        prevptr = NULL;
        while (cptr->ac_next) {
            prevptr = cptr;
            cptr = cptr->ac_next;
        }
 
#ifdef ND_DEBUG
        fprintf(stderr, "Deleted from cache: %s : %s\n",
            cptr->ac_host, cptr->ac_netid);
#endif
        free(cptr->ac_host);
        free(cptr->ac_netid);
        free(cptr->ac_taddr->buf);
        free(cptr->ac_taddr);
        if (cptr->ac_uaddr)
            free(cptr->ac_uaddr);
 
        if (prevptr) {
            prevptr->ac_next = NULL;
            ad_cache->ac_next = front;
            front = ad_cache;
        } else {
            front = ad_cache;
            ad_cache->ac_next = NULL;
        }
        free(cptr);
    }
    rwlock_unlock(&rpcbaddr_cache_lock);
}
 
/*
 * This routine will return a client handle that is connected to the
 * rpcbind. If targaddr is non-NULL, the "universal address" of the
 * host will be stored in *targaddr; the caller is responsible for
 * freeing this string.
 * On error, returns NULL and free's everything.
 */
static CLIENT *
getclnthandle(host, nconf, targaddr)
    const char *host;
    const struct netconfig *nconf;
    char **targaddr;
{
    CLIENT *client;
    struct netbuf *addr, taddr;
    struct netbuf addr_to_delete;
    struct __rpc_sockinfo si;
    struct addrinfo hints, *res, *tres;
    struct address_cache *ad_cache;
    char *tmpaddr;
 
/* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  ad_cache */
 
    /* Get the address of the rpcbind.  Check cache first */
    client = NULL;
    addr_to_delete.len = 0;
    rwlock_rdlock(&rpcbaddr_cache_lock);
    ad_cache = NULL;
    if (host != NULL)
        ad_cache = check_cache(host, nconf->nc_netid);
    if (ad_cache != NULL) {
        addr = ad_cache->ac_taddr;
        client = clnt_tli_create(RPC_ANYFD, nconf, addr,
            (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0, NULL, NULL, NULL);
        if (client != NULL) {
            if (targaddr)
                *targaddr = strdup(ad_cache->ac_uaddr);
            rwlock_unlock(&rpcbaddr_cache_lock);
            return (client);
        }
        addr_to_delete.len = addr->len;
        addr_to_delete.buf = (char *)malloc(addr->len);
        if (addr_to_delete.buf == NULL) {
            addr_to_delete.len = 0;
        } else {
            memcpy(addr_to_delete.buf, addr->buf, addr->len);
        }
    }
    rwlock_unlock(&rpcbaddr_cache_lock);
    if (addr_to_delete.len != 0) {
        /*
         * Assume this may be due to cache data being
         *  outdated
         */
        rwlock_wrlock(&rpcbaddr_cache_lock);
        delete_cache(&addr_to_delete);
        rwlock_unlock(&rpcbaddr_cache_lock);
        free(addr_to_delete.buf);
    }
    if (!__rpc_nconf2sockinfo(nconf, &si)) {
        rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        return NULL;
    }
 
    memset(&hints, 0, sizeof hints);
    hints.ai_family = si.si_af;
    hints.ai_socktype = si.si_socktype;
    hints.ai_protocol = si.si_proto;
 
#ifdef CLNT_DEBUG
    printf("trying netid %s family %d proto %d socktype %d\n",
        nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype);
#endif
 
    if (nconf->nc_protofmly != NULL && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
        client = local_rpcb();
        if (! client) {
#ifdef ND_DEBUG
            clnt_pcreateerror("rpcbind clnt interface");
#endif
            return (NULL);
        } else {
            struct sockaddr_un sun;
 
            *targaddr = malloc(sizeof(sun.sun_path));
            strncpy(*targaddr, _PATH_RPCBINDSOCK,
                sizeof(sun.sun_path));
            return (client);
        }
    } else {
        if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) {
            rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
            return NULL;
        }
    }
 
    for (tres = res; tres != NULL; tres = tres->ai_next) {
        taddr.buf = tres->ai_addr;
        taddr.len = taddr.maxlen = tres->ai_addrlen;
 
#ifdef ND_DEBUG
        {
            char *ua;
 
            ua = taddr2uaddr(nconf, &taddr);
            fprintf(stderr, "Got it [%s]\n", ua);
            free(ua);
        }
#endif
 
#ifdef ND_DEBUG
        {
            int i;
 
            fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n",
                taddr.len, taddr.maxlen);
            fprintf(stderr, "\tAddress is ");
            for (i = 0; i < taddr.len; i++)
                fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]);
            fprintf(stderr, "\n");
        }
#endif
        client = clnt_tli_create(RPC_ANYFD, nconf, &taddr,
            (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0, NULL, NULL, NULL);
#ifdef ND_DEBUG
        if (! client) {
            clnt_pcreateerror("rpcbind clnt interface");
        }
#endif
 
        if (client) {
            tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL;
            add_cache(host, nconf->nc_netid, &taddr, tmpaddr);
            if (targaddr)
                *targaddr = tmpaddr;
            break;
        }
    }
    if (res)
        freeaddrinfo(res);
    return (client);
}
 
/* XXX */
#define IN4_LOCALHOST_STRING    "127.0.0.1"
#define IN6_LOCALHOST_STRING    "::1"
 
/*
 * This routine will return a client handle that is connected to the local
 * rpcbind. Returns NULL on error and free's everything.
 */
static CLIENT *
local_rpcb()
{
    CLIENT *client;
    static struct netconfig *loopnconf;
    static char *hostname;
    extern mutex_t loopnconf_lock;
    SOCKET sock;
    size_t tsize;
    struct netbuf nbuf;
    struct sockaddr_un sun;
 
    /*
     * Try connecting to the local rpcbind through a local socket
     * first. If this doesn't work, try all transports defined in
     * the netconfig file.
     */
    memset(&sun, 0, sizeof sun);
    sock = socket(AF_UNIX, SOCK_STREAM, 0);
    if (sock == INVALID_SOCKET)
        goto try_nconf;
    sun.sun_family = AF_UNIX;
    strcpy(sun.sun_path, _PATH_RPCBINDSOCK);
    nbuf.len = SUN_LEN(&sun);
    nbuf.maxlen = sizeof (struct sockaddr_un);
    nbuf.buf = &sun;
 
    tsize = __rpc_get_t_size(AF_UNIX, 0, 0);
    client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG,
        (rpcvers_t)RPCBVERS, (u_int)tsize, (u_int)tsize, 
        NULL, NULL, NULL);
 
    if (client != NULL) {
        /* Mark the socket to be closed in destructor */
        (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL);
        return client;
    }
 
    /* Nobody needs this socket anymore; free the descriptor. */
    closesocket(sock);
 
try_nconf:
 
/* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */
    mutex_lock(&loopnconf_lock);
    if (loopnconf == NULL) {
        struct netconfig *nconf, *tmpnconf = NULL;
        void *nc_handle;
        SOCKET fd;
 
        nc_handle = setnetconfig();
        if (nc_handle == NULL) {
            /* fails to open netconfig file */
            //syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
            rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
            mutex_unlock(&loopnconf_lock);
            return (NULL);
        }
        while ((nconf = getnetconfig(nc_handle)) != NULL) {
#ifdef INET6
            if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 ||
#else
            if ((
#endif
                 strcmp(nconf->nc_protofmly, NC_INET) == 0) &&
                (nconf->nc_semantics == NC_TPI_COTS ||
                 nconf->nc_semantics == NC_TPI_COTS_ORD)) {
                fd = __rpc_nconf2fd(nconf);
                /*
                 * Can't create a socket, assume that
                 * this family isn't configured in the kernel.
                 */
                if (fd == SOCKET_ERROR)
                    continue;
                closesocket(fd);
                tmpnconf = nconf;
                if (!strcmp(nconf->nc_protofmly, NC_INET))
                    hostname = IN4_LOCALHOST_STRING;
                else
                    hostname = IN6_LOCALHOST_STRING;
            }
        }
        if (tmpnconf == NULL) {
            rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
            mutex_unlock(&loopnconf_lock);
            return (NULL);
        }
        loopnconf = getnetconfigent(tmpnconf->nc_netid);
        /* loopnconf is never freed */
        endnetconfig(nc_handle);
    }
    mutex_unlock(&loopnconf_lock);
    client = getclnthandle(hostname, loopnconf, NULL);
    return (client);
}
 
/*
 * Set a mapping between program, version and address.
 * Calls the rpcbind service to do the mapping.
 */
bool_t
rpcb_set(program, version, nconf, address)
    rpcprog_t program;
    rpcvers_t version;
    const struct netconfig *nconf;  /* Network structure of transport */
    const struct netbuf *address;       /* Services netconfig address */
{
    CLIENT *client;
    bool_t rslt = FALSE;
    RPCB parms;
    char uidbuf[32];
 
    /* parameter checking */
    if (nconf == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        return (FALSE);
    }
    if (address == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
        return (FALSE);
    }
    client = local_rpcb();
    if (! client) {
        return (FALSE);
    }
 
    /* convert to universal */
    /*LINTED const castaway*/
    parms.r_addr = taddr2uaddr((struct netconfig *) nconf,
                   (struct netbuf *)address);
    if (!parms.r_addr) {
        CLNT_DESTROY(client);
        rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
        return (FALSE); /* no universal address */
    }
    parms.r_prog = program;
    parms.r_vers = version;
    parms.r_netid = nconf->nc_netid;
    /*
     * Though uid is not being used directly, we still send it for
     * completeness.  For non-unix platforms, perhaps some other
     * string or an empty string can be sent.
     */
    (void) snprintf(uidbuf, sizeof uidbuf, "%d", 20010 /*geteuid()*/);
    parms.r_owner = uidbuf;
 
    CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb,
        (char *)&parms, (xdrproc_t) xdr_bool,
        (char *)&rslt, tottimeout);
 
    CLNT_DESTROY(client);
    free(parms.r_addr);
    return (rslt);
}
 
/*
 * Remove the mapping between program, version and netbuf address.
 * Calls the rpcbind service to do the un-mapping.
 * If netbuf is NULL, unset for all the transports, otherwise unset
 * only for the given transport.
 */
bool_t
rpcb_unset(program, version, nconf)
    rpcprog_t program;
    rpcvers_t version;
    const struct netconfig *nconf;
{
    CLIENT *client;
    bool_t rslt = FALSE;
    RPCB parms;
    char uidbuf[32];
 
    client = local_rpcb();
    if (! client) {
        return (FALSE);
    }
 
    parms.r_prog = program;
    parms.r_vers = version;
    if (nconf)
        parms.r_netid = nconf->nc_netid;
    else {
        /*LINTED const castaway*/
        parms.r_netid = (char *) &nullstring[0]; /* unsets  all */
    }
    /*LINTED const castaway*/
    parms.r_addr = (char *) &nullstring[0];
    (void) snprintf(uidbuf, sizeof uidbuf, "%d", 20010 /*geteuid()*/);
    parms.r_owner = uidbuf;
 
    CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb,
        (char *)(void *)&parms, (xdrproc_t) xdr_bool,
        (char *)(void *)&rslt, tottimeout);
 
    CLNT_DESTROY(client);
    return (rslt);
}
#ifdef NOTUSED
/*
 * From the merged list, find the appropriate entry
 */
static struct netbuf *
got_entry(relp, nconf)
    rpcb_entry_list_ptr relp;
    const struct netconfig *nconf;
{
    struct netbuf *na = NULL;
    rpcb_entry_list_ptr sp;
    rpcb_entry *rmap;
 
    for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) {
        rmap = &sp->rpcb_entry_map;
        if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) &&
            (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) &&
            (nconf->nc_semantics == rmap->r_nc_semantics) &&
            (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) {
            na = uaddr2taddr(nconf, rmap->r_maddr);
#ifdef ND_DEBUG
            fprintf(stderr, "\tRemote address is [%s].\n",
                rmap->r_maddr);
            if (!na)
                fprintf(stderr,
                    "\tCouldn't resolve remote address!\n");
#endif
            break;
        }
    }
    return (na);
}
#endif
 
/*
 * Quick check to see if rpcbind is up.  Tries to connect over
 * local transport.
 */
bool_t
__rpcbind_is_up()
{
    struct netconfig *nconf;
    struct sockaddr_un sun;
    void *localhandle;
    SOCKET sock;
 
    nconf = NULL;
    localhandle = setnetconfig();
    while ((nconf = getnetconfig(localhandle)) != NULL) {
        if (nconf->nc_protofmly != NULL &&
            strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
             break;
    }
    if (nconf == NULL)
        return (FALSE);
 
    endnetconfig(localhandle);
 
    memset(&sun, 0, sizeof sun);
    sock = socket(AF_UNIX, SOCK_STREAM, 0);
    if (sock == INVALID_SOCKET)
        return (FALSE);
    sun.sun_family = AF_UNIX;
    strncpy(sun.sun_path, _PATH_RPCBINDSOCK, sizeof(sun.sun_path));
 
    if (connect(sock, (struct sockaddr *)&sun, sizeof(sun)) == SOCKET_ERROR) {
        closesocket(sock);
        return (FALSE);
    }
 
    closesocket(sock);
    return (TRUE);
}
 
/*
 * An internal function which optimizes rpcb_getaddr function.  It also
 * returns the client handle that it uses to contact the remote rpcbind.
 *
 * The algorithm used: If the transports is TCP or UDP, it first tries
 * version 2 (portmap), 4 and then 3 (svr4).  This order should be
 * changed in the next OS release to 4, 2 and 3.  We are assuming that by
 * that time, version 4 would be available on many machines on the network.
 * With this algorithm, we get performance as well as a plan for
 * obsoleting version 2.
 *
 * For all other transports, the algorithm remains as 4 and then 3.
 *
 * XXX: Due to some problems with t_connect(), we do not reuse the same client
 * handle for COTS cases and hence in these cases we do not return the
 * client handle.  This code will change if t_connect() ever
 * starts working properly.  Also look under clnt_vc.c.
 */
struct netbuf *
__rpcb_findaddr_timed(program, version, nconf, host, clpp, tp)
    rpcprog_t program;
    rpcvers_t version;
    const struct netconfig *nconf;
    const char *host;
    CLIENT **clpp;
    struct timeval *tp;
{
#ifdef NOTUSED
    static bool_t check_rpcbind = TRUE;
#endif
    CLIENT *client = NULL;
    RPCB parms;
    enum clnt_stat clnt_st;
    char *ua = NULL;
    rpcvers_t vers;
    struct netbuf *address = NULL;
    rpcvers_t start_vers = RPCBVERS4;
    struct netbuf servaddr;
 
    /* parameter checking */
    if (nconf == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        return (NULL);
    }
 
    parms.r_addr = NULL;
 
    /*
     * Use default total timeout if no timeout is specified.
     */
    if (tp == NULL)
        tp = &tottimeout;
    
#ifdef PORTMAP
    /* Try version 2 for TCP or UDP */
    if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
        u_short port = 0;
        struct netbuf remote;
        rpcvers_t pmapvers = 2;
        struct pmap pmapparms;
 
        /*
         * Try UDP only - there are some portmappers out
         * there that use UDP only.
         */
        if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
            struct netconfig *newnconf;
 
            if ((newnconf = getnetconfigent("udp")) == NULL) {
                rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
                return (NULL);
            }
            client = getclnthandle(host, newnconf, &parms.r_addr);
            freenetconfigent(newnconf);
        } else if (strcmp(nconf->nc_proto, NC_UDP) == 0)
            client = getclnthandle(host, nconf, &parms.r_addr);
        else
            goto try_rpcbind;
        if (client == NULL)
            return (NULL);
 
        /*
         * Set version and retry timeout.
         */
        CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);
        CLNT_CONTROL(client, CLSET_VERS, (char *)&pmapvers);
 
        pmapparms.pm_prog = program;
        pmapparms.pm_vers = version;
        pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ?
                    IPPROTO_UDP : IPPROTO_TCP;
        pmapparms.pm_port = 0;  /* not needed */
        clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT,
            (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms,
            (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port,
            *tp);
        if (clnt_st != RPC_SUCCESS) {
            if ((clnt_st == RPC_PROGVERSMISMATCH) ||
                (clnt_st == RPC_PROGUNAVAIL))
                goto try_rpcbind;
            rpc_createerr.cf_stat = RPC_PMAPFAILURE;
            clnt_geterr(client, &rpc_createerr.cf_error);
            goto error;
        } else if (port == 0) {
            address = NULL;
            rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
            goto error;
        }
        port = htons(port);
        CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)&remote);
        if (((address = (struct netbuf *)
            malloc(sizeof (struct netbuf))) == NULL) ||
            ((address->buf = (char *)
            malloc(remote.len)) == NULL)) {
            rpc_createerr.cf_stat = RPC_SYSTEMERROR;
            clnt_geterr(client, &rpc_createerr.cf_error);
            if (address) {
                free(address);
                address = NULL;
            }
            goto error;
        }
        memcpy(address->buf, remote.buf, remote.len);
        memcpy(&((char *)address->buf)[sizeof (short)],
                (char *)(void *)&port, sizeof (short));
        address->len = address->maxlen = remote.len;
        goto done;
    }
 
try_rpcbind:
#endif              /* PORTMAP */
 
    parms.r_prog = program;
    parms.r_vers = version;
    parms.r_netid = nconf->nc_netid;
 
    /*
     * rpcbind ignores the r_owner field in GETADDR requests, but we
     * need to give xdr_rpcb something to gnaw on. Might as well make
     * it something human readable for when we see these in captures.
     */
    parms.r_owner = RPCB_OWNER_STRING;
 
    /* Now the same transport is to be used to get the address */
    if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) ||
            (nconf->nc_semantics == NC_TPI_COTS))) {
        /* A CLTS type of client - destroy it */
        CLNT_DESTROY(client);
        client = NULL;
        free(parms.r_addr);
        parms.r_addr = NULL;
    }
 
    if (client == NULL) {
        client = getclnthandle(host, nconf, &parms.r_addr);
        if (client == NULL) {
            goto error;
        }
    }
    if (parms.r_addr == NULL) {
        /*LINTED const castaway*/
        parms.r_addr = (char *) &nullstring[0];
    }
 
    /* First try from start_vers(4) and then version 3 (RPCBVERS) */
 
    CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *) &rpcbrmttime);
    for (vers = start_vers;  vers >= RPCBVERS; vers--) {
        /* Set the version */
        CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
        clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR,
            (xdrproc_t) xdr_rpcb, (char *)(void *)&parms,
            (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, *tp);
        if (clnt_st == RPC_SUCCESS) {
            if ((ua == NULL) || (ua[0] == 0)) {
                /* address unknown */
                rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
                goto error;
            }
            address = uaddr2taddr(nconf, ua);
#ifdef ND_DEBUG
            fprintf(stderr, "\tRemote address is [%s]\n", ua);
            if (!address)
                fprintf(stderr,
                    "\tCouldn't resolve remote address!\n");
#endif
            xdr_free((xdrproc_t)xdr_wrapstring,
                (char *)(void *)&ua);
 
            if (! address) {
                /* We don't know about your universal address */
                rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
                goto error;
            }
            CLNT_CONTROL(client, CLGET_SVC_ADDR,
                (char *)(void *)&servaddr);
            __rpc_fixup_addr(address, &servaddr);
            goto done;
        } else if (clnt_st == RPC_PROGVERSMISMATCH) {
            struct rpc_err rpcerr;
            clnt_geterr(client, &rpcerr);
            if (rpcerr.re_vers.low > RPCBVERS4)
                goto error;  /* a new version, can't handle */
        } else if (clnt_st != RPC_PROGUNAVAIL) {
            /* Cant handle this error */
            rpc_createerr.cf_stat = clnt_st;
            clnt_geterr(client, &rpc_createerr.cf_error);
            goto error;
        }
    }
 
    if ((address == NULL) || (address->len == 0)) {
      rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
      clnt_geterr(client, &rpc_createerr.cf_error);
    }
 
error:
    if (client) {
        CLNT_DESTROY(client);
        client = NULL;
    }
done:
    if (nconf->nc_semantics != NC_TPI_CLTS) {
        /* This client is the connectionless one */
        if (client) {
            CLNT_DESTROY(client);
            client = NULL;
        }
    }
    if (clpp) {
        *clpp = client;
    } else if (client) {
        CLNT_DESTROY(client);
    }
    if (parms.r_addr != NULL && parms.r_addr != nullstring)
        free(parms.r_addr);
    return (address);
}
 
 
/*
 * Find the mapped address for program, version.
 * Calls the rpcbind service remotely to do the lookup.
 * Uses the transport specified in nconf.
 * Returns FALSE (0) if no map exists, else returns 1.
 *
 * Assuming that the address is all properly allocated
 */
int
rpcb_getaddr(program, version, nconf, address, host)
    rpcprog_t program;
    rpcvers_t version;
    const struct netconfig *nconf;
    struct netbuf *address;
    const char *host;
{
    struct netbuf *na;
 
    if ((na = __rpcb_findaddr_timed(program, version,
        (struct netconfig *) nconf, (char *) host,
        (CLIENT **) NULL, (struct timeval *) NULL)) == NULL)
        return (FALSE);
 
    if (na->len > address->maxlen) {
        /* Too long address */
        free(na->buf);
        free(na);
        rpc_createerr.cf_stat = RPC_FAILED;
        return (FALSE);
    }
    memcpy(address->buf, na->buf, (size_t)na->len);
    address->len = na->len;
    free(na->buf);
    free(na);
    return (TRUE);
}
 
/*
 * Get a copy of the current maps.
 * Calls the rpcbind service remotely to get the maps.
 *
 * It returns only a list of the services
 * It returns NULL on failure.
 */
rpcblist *
rpcb_getmaps(nconf, host)
    const struct netconfig *nconf;
    const char *host;
{
    rpcblist_ptr head = NULL;
    CLIENT *client;
    enum clnt_stat clnt_st;
    rpcvers_t vers = 0;
 
    client = getclnthandle(host, nconf, NULL);
    if (client == NULL) {
        return (head);
    }
    clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP,
        (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr,
        (char *)(void *)&head, tottimeout);
    if (clnt_st == RPC_SUCCESS)
        goto done;
 
    if ((clnt_st != RPC_PROGVERSMISMATCH) &&
        (clnt_st != RPC_PROGUNAVAIL)) {
        rpc_createerr.cf_stat = RPC_RPCBFAILURE;
        clnt_geterr(client, &rpc_createerr.cf_error);
        goto done;
    }
 
    /* fall back to earlier version */
    CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers);
    if (vers == RPCBVERS4) {
        vers = RPCBVERS;
        CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
        if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP,
            (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr,
            (char *)(void *)&head, tottimeout) == RPC_SUCCESS)
            goto done;
    }
    rpc_createerr.cf_stat = RPC_RPCBFAILURE;
    clnt_geterr(client, &rpc_createerr.cf_error);
 
done:
    CLNT_DESTROY(client);
    return (head);
}
 
/*
 * rpcbinder remote-call-service interface.
 * This routine is used to call the rpcbind remote call service
 * which will look up a service program in the address maps, and then
 * remotely call that routine with the given parameters. This allows
 * programs to do a lookup and call in one step.
*/
enum clnt_stat
rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp,
        xdrres, resp, tout, addr_ptr)
    const struct netconfig *nconf;  /* Netconfig structure */
    const char *host;           /* Remote host name */
    rpcprog_t prog;
    rpcvers_t vers;
    rpcproc_t proc;         /* Remote proc identifiers */
    xdrproc_t xdrargs, xdrres;  /* XDR routines */
    caddr_t argsp, resp;        /* Argument and Result */
    struct timeval tout;        /* Timeout value for this call */
    const struct netbuf *addr_ptr;  /* Preallocated netbuf address */
{
    CLIENT *client;
    enum clnt_stat stat;
    struct r_rpcb_rmtcallargs a;
    struct r_rpcb_rmtcallres r;
    rpcvers_t rpcb_vers;
 
    stat = 0;
    client = getclnthandle(host, nconf, NULL);
    if (client == NULL) {
        return (RPC_FAILED);
    }
    /*LINTED const castaway*/
    CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)(void *)&rmttimeout);
    a.prog = prog;
    a.vers = vers;
    a.proc = proc;
    a.args.args_val = argsp;
    a.xdr_args = xdrargs;
    r.addr = NULL;
    r.results.results_val = resp;
    r.xdr_res = xdrres;
 
    for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) {
        CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers);
        stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT,
            (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a,
            (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout);
        if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) {
            struct netbuf *na;
            /*LINTED const castaway*/
            na = uaddr2taddr((struct netconfig *) nconf, r.addr);
            if (!na) {
                stat = RPC_N2AXLATEFAILURE;
                /*LINTED const castaway*/
                ((struct netbuf *) addr_ptr)->len = 0;
                goto error;
            }
            if (na->len > addr_ptr->maxlen) {
                /* Too long address */
                stat = RPC_FAILED; /* XXX A better error no */
                free(na->buf);
                free(na);
                /*LINTED const castaway*/
                ((struct netbuf *) addr_ptr)->len = 0;
                goto error;
            }
            memcpy(addr_ptr->buf, na->buf, (size_t)na->len);
            /*LINTED const castaway*/
            ((struct netbuf *)addr_ptr)->len = na->len;
            free(na->buf);
            free(na);
            break;
        } else if ((stat != RPC_PROGVERSMISMATCH) &&
                (stat != RPC_PROGUNAVAIL)) {
            goto error;
        }
    }
error:
    CLNT_DESTROY(client);
    if (r.addr)
        xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr);
    return (stat);
}
 
#ifndef _WIN32
/*
 * Gets the time on the remote host.
 * Returns 1 if succeeds else 0.
 */
bool_t
rpcb_gettime(host, timep)
    const char *host;
    time_t *timep;
{
    CLIENT *client = NULL;
    void *handle;
    struct netconfig *nconf;
    rpcvers_t vers;
    enum clnt_stat st;
 
    if ((host == NULL) || (host[0] == 0)) {
        time(timep);
        return (TRUE);
    }
 
    if ((handle = __rpc_setconf("netpath")) == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        return (FALSE);
    }
    rpc_createerr.cf_stat = RPC_SUCCESS;
    while (client == NULL) {
        if ((nconf = __rpc_getconf(handle)) == NULL) {
            if (rpc_createerr.cf_stat == RPC_SUCCESS)
                rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
            break;
        }
        client = getclnthandle(host, nconf, NULL);
        if (client)
            break;
    }
    __rpc_endconf(handle);
    if (client == (CLIENT *) NULL) {
        return (FALSE);
    }
 
    st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME,
        (xdrproc_t) xdr_void, NULL,
        (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout);
 
    if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) {
        CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers);
        if (vers == RPCBVERS4) {
            /* fall back to earlier version */
            vers = RPCBVERS;
            CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers);
            st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME,
                (xdrproc_t) xdr_void, NULL,
                (xdrproc_t) xdr_int, (char *)(void *)timep,
                tottimeout);
        }
    }
    CLNT_DESTROY(client);
    return (st == RPC_SUCCESS? TRUE: FALSE);
}
#endif
 
/*
 * Converts taddr to universal address.  This routine should never
 * really be called because local n2a libraries are always provided.
 */
char *
rpcb_taddr2uaddr(nconf, taddr)
    struct netconfig *nconf;
    struct netbuf *taddr;
{
    CLIENT *client;
    char *uaddr = NULL;
 
 
    /* parameter checking */
    if (nconf == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        return (NULL);
    }
    if (taddr == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
        return (NULL);
    }
    client = local_rpcb();
    if (! client) {
        return (NULL);
    }
 
    CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR,
        (xdrproc_t) xdr_netbuf, (char *)(void *)taddr,
        (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout);
    CLNT_DESTROY(client);
    return (uaddr);
}
 
/*
 * Converts universal address to netbuf.  This routine should never
 * really be called because local n2a libraries are always provided.
 */
struct netbuf *
rpcb_uaddr2taddr(nconf, uaddr)
    struct netconfig *nconf;
    char *uaddr;
{
    CLIENT *client;
    struct netbuf *taddr;
 
 
    /* parameter checking */
    if (nconf == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        return (NULL);
    }
    if (uaddr == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
        return (NULL);
    }
    client = local_rpcb();
    if (! client) {
        return (NULL);
    }
 
    taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf));
    if (taddr == NULL) {
        CLNT_DESTROY(client);
        return (NULL);
    }
    if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR,
        (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr,
        (xdrproc_t) xdr_netbuf, (char *)(void *)taddr,
        tottimeout) != RPC_SUCCESS) {
        free(taddr);
        taddr = NULL;
    }
    CLNT_DESTROY(client);
    return (taddr);
}