/*
 * Copyright (c) 1992/3 Theo de Raadt <deraadt@fsa.ca>
 * 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. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * 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.
 */

/*
 *  Modifications for linux by Swen Thuemmler <swen@uni-paderborn.de>
 */

#ifndef LINT
static char *rcsid = "yplib.c,v 2.6 1994/05/27 14:34:43 swen Exp";
#endif

#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "yp.h"
#include <rpcsvc/ypclnt.h>

#ifndef BINDINGDIR
#define BINDINGDIR "/var/yp/binding"
#endif
#define YPMATCHCACHE
#define USE_BINDINGDIR 0 /* We don't want it */

static void ypmatch_add (char *, char *, int, char *, int);
static bool_t ypmatch_find (char *, char *, int, char **, int *);
int __yp_dobind (char *, struct dom_binding **);
static void __yp_unbind (struct dom_binding *);
int __yp_check (char **);
int yp_maplist (char *, struct ypmaplist **);
int (*ypresp_allfn)(int, char *, int, char *, int, char *);
void *ypresp_data;

struct dom_binding *__ypbindlist;
static char __yp_domain[MAXHOSTNAMELEN];
int __yplib_timeout = 10;

#ifdef YPMATCHCACHE
int __yplib_cache = 5;

static struct ypmatch_ent
{
  struct ypmatch_ent *next;
  char *map, *key, *val;
  int keylen, vallen;
  time_t expire_t;
} *ypmc;

static void
ypmatch_add (char *map, char *key, int keylen, char *val, int vallen)
{
  struct ypmatch_ent *ep;
  time_t t;
  
  time (&t);
  
  for (ep = ypmc; ep; ep = ep->next)
    if (ep->expire_t < t)
      break;
  if (NULL == ep)
    {
      ep = (struct ypmatch_ent *) malloc (sizeof *ep);
      bzero ((char *) ep, sizeof *ep);
      if (ypmc)
        ep->next = ypmc;
      ypmc = ep;
    }
  
  if (ep->key)
    free (ep->key);
  if (ep->val)
    free (ep->val);
  
  ep->key = NULL;
  ep->val = NULL;
  
  ep->key = (char *) malloc (keylen);
  if (NULL == ep->key)
    return;
  
  ep->val = (char *) malloc (vallen);
  if (NULL == ep->key)
    {
      free (ep->key);
      ep->key = NULL;
      return;
    }
  ep->keylen = keylen;
  ep->vallen = vallen;
  
  bcopy (key, ep->key, ep->keylen);
  bcopy (val, ep->val, ep->vallen);
  
  if (ep->map)
    {
      if (strcmp (ep->map, map))
        {
          free (ep->map);
          ep->map = strdup (map);
        }
    }
  else
    {
      ep->map = strdup (map);
    }
  
  ep->expire_t = t + __yplib_cache;
}

static bool_t
ypmatch_find (char *map, char *key, int keylen, char **val, int *vallen)
{
  struct ypmatch_ent *ep;
  time_t t;
  
  if (NULL == ypmc)
    return 0;
  
  time (&t);
  
  for (ep = ypmc; ep; ep = ep->next)
    {
      if (ep->keylen != keylen)
        continue;
      if (strcmp (ep->map, map))
        continue;
      if (bcmp (ep->key, key, keylen))
        continue;
      if (t > ep->expire_t)
        continue;
      
      *val = ep->val;
      *vallen = ep->vallen;
      return 1;
    }
  return 0;
}

#endif

int
__yp_dobind (char *dom, struct dom_binding **ypdb)
{
  static int pid = -1;
  struct dom_binding *ysd, *ysd2;
  struct ypbind_resp ypbr;
  struct timeval tv;
  struct sockaddr_in clnt_sin;
  int clnt_sock, gpid;
#if USE_BINDINGDIR
  char path[MAXPATHLEN];
  int fd;
#endif  
  CLIENT *client;
  int new = 0, r;
  
  gpid = getpid ();
  if (!(-1 == pid || gpid == pid))
    {
      ysd = __ypbindlist;
      while (ysd)
        {
          if (ysd->dom_client)
            clnt_destroy (ysd->dom_client);
          ysd2 = ysd->dom_pnext;
          free (ysd);
          ysd = ysd2;
        }
      __ypbindlist = NULL;
    }
  pid = gpid;
  
  if (NULL != ypdb)
    *ypdb = NULL;
  
  if (NULL == dom || 0 == strlen (dom))
    return YPERR_BADARGS;
  
  for (ysd = __ypbindlist; ysd; ysd = ysd->dom_pnext)
    if (strcmp (dom, ysd->dom_domain) == 0)
      break;
  if (NULL == ysd)
    {
      ysd = (struct dom_binding *) malloc (sizeof *ysd);
      bzero ((char *) ysd, sizeof *ysd);
      ysd->dom_socket = -1;
      ysd->dom_vers = 0;
      new = 1;
    }
  again:
#if USE_BINDINGDIR
  if (0 == ysd->dom_vers)
    {
      sprintf (path, "%s/%s.%d", BINDINGDIR, dom, 2);
      if ((fd = open (path, O_RDONLY)) == -1)
        {
              /* no binding file, YP is dead. */
          if (new)
            free (ysd);
          return YPERR_YPBIND;
        }
      if (flock (fd, LOCK_EX | LOCK_NB) == -1 && errno == EWOULDBLOCK)
        {
          struct iovec iov[2];
          struct ypbind_resp ybr;
          u_short ypb_port;
          
          iov[0].iov_base = (caddr_t) & ypb_port;
          iov[0].iov_len = sizeof ypb_port;
          iov[1].iov_base = (caddr_t) & ybr;
          iov[1].iov_len = sizeof ybr;
          
          r = readv (fd, iov, 2);
          if (r != iov[0].iov_len + iov[1].iov_len)
            {
              close (fd);
              ysd->dom_vers = -1;
              goto again;
            }
          
          bzero (&ysd->dom_server_addr, sizeof ysd->dom_server_addr);
          ysd->dom_server_addr.sin_family = AF_INET;
          ysd->dom_server_addr.sin_addr.s_addr =
            ybr.ypbind_respbody.ypbind_bindinfo.ypbind_binding_addr.s_addr;
          ysd->dom_server_addr.sin_port =
            ybr.ypbind_respbody.ypbind_bindinfo.ypbind_binding_port;
          ysd->dom_server_port = ysd->dom_server_addr.sin_port;
          close (fd);
          goto gotit;
        }
      else
        {
              /* no lock on binding file, YP is dead. */
          close (fd);
          if (new)
            free (ysd);
          return YPERR_YPBIND;
        }
    }
#endif
  if (-1 == ysd->dom_vers || 0 == ysd->dom_vers)
    {
      bzero ((char *) &clnt_sin, sizeof clnt_sin);
      clnt_sin.sin_family = AF_INET;
      clnt_sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
      clnt_sock = RPC_ANYSOCK;
      client = clnttcp_create (&clnt_sin,
                               YPBINDPROG, YPBINDVERS,
                               &clnt_sock, 0, 0);
      if (NULL == client)
        {
#if 0
          clnt_pcreateerror ("clnttcp_create");
#endif
          if (new)
            free (ysd);
          return YPERR_YPBIND;
        }
      tv.tv_sec = __yplib_timeout;
      tv.tv_usec = 0;
      r = clnt_call (client,
                     YPBINDPROC_DOMAIN,
                     xdr_domainname, dom,
                     xdr_ypbind_resp, &ypbr,
                     tv);
      if (r != RPC_SUCCESS)
        {
          fprintf (stderr,
                   "YP: server for domain %s not responding, still trying\n",
                   dom);
          clnt_destroy (client);
          ysd->dom_vers = -1;
          goto again;
        }
      clnt_destroy (client);
      switch (ypbr.ypbind_status)
        {
        case YPBIND_FAIL_VAL:
          switch(ypbr.ypbind_respbody.ypbind_error)
            {
            case YPBIND_ERR_ERR:
              fprintf(stderr, "YPBINDPROC_DOMAIN: Internal error\n");
              break;
            case YPBIND_ERR_NOSERV:
              fprintf(stderr,
                      "YPBINDPROC_DOMAIN: No bound server for domain %s\n",

                      dom);
              break;
            case YPBIND_ERR_RESC:
              fprintf(stderr, "YPBINDPROC_DOMAIN: Resource allocation failure\n");
              break;
            default:
              fprintf(stderr, "YPBINDPROC_DOMAIN: Unknown error\n");
              break;
            }
          return YPERR_DOMAIN;
        case YPBIND_SUCC_VAL:
          {
            bzero ((char *) &ysd->dom_server_addr, sizeof ysd->dom_server_addr);
            ysd->dom_server_addr.sin_family = AF_INET;
            ysd->dom_server_addr.sin_port = 
              ypbr.ypbind_respbody.ypbind_bindinfo.ypbind_binding_port;
            ysd->dom_server_addr.sin_addr.s_addr =
              ypbr.ypbind_respbody.ypbind_bindinfo.ypbind_binding_addr.s_addr;
            ysd->dom_server_port = 
              ypbr.ypbind_respbody.ypbind_bindinfo.ypbind_binding_port;
          }
        }
      gotit:
      ysd->dom_vers = YPVERS;
      strcpy (ysd->dom_domain, dom);
    }
  tv.tv_sec = __yplib_timeout / 2;
  tv.tv_usec = 0;
  if (ysd->dom_client)
    clnt_destroy (ysd->dom_client);
  ysd->dom_socket = RPC_ANYSOCK;
  ysd->dom_client = clntudp_create (&ysd->dom_server_addr,
                                    YPPROG, YPVERS,
                                    tv, &ysd->dom_socket);
  if (NULL == ysd->dom_client)
    {
#if 0
      clnt_pcreateerror ("clntudp_create");
#endif
      ysd->dom_vers = -1;
      goto again;
    }
  if (-1 == fcntl (ysd->dom_socket, F_SETFD, 1))
    perror ("fcntl: F_SETFD");
  
  if (new)
    {
      ysd->dom_pnext = __ypbindlist;
      __ypbindlist = ysd;
    }
  
  if (NULL != ypdb)
    *ypdb = ysd;
  return 0;
}

static void
__yp_unbind (struct dom_binding *ypb)
{
  clnt_destroy (ypb->dom_client);
  ypb->dom_client = NULL;
  ypb->dom_socket = -1;
}

int
yp_bind (char *dom)
{
  return __yp_dobind (dom, NULL);
}

void
yp_unbind (char *dom)
{
  struct dom_binding *ypb, *ypbp;
  
  ypbp = NULL;
  for (ypb = __ypbindlist; ypb; ypb = ypb->dom_pnext)
    {
      if (strcmp (dom, ypb->dom_domain) == 0)
        {
          clnt_destroy (ypb->dom_client);
          if (ypbp)
            ypbp->dom_pnext = ypb->dom_pnext;
          else
            __ypbindlist = ypb->dom_pnext;
          free (ypb);
          return;
        }
      ypbp = ypb;
    }
  return;
}

int
yp_match (char *indomain, char *inmap, char *inkey, int inkeylen, char **outval, int *outvallen)
{
  struct dom_binding *ysd;
  struct ypresp_val yprv;
  struct timeval tv;
  struct ypreq_key yprk;
  int r;
  
  *outval = NULL;
  *outvallen = 0;
  
  again:
  if (__yp_dobind (indomain, &ysd) != 0)
    return YPERR_DOMAIN;
  
#ifdef YPMATCHCACHE
  if (!strcmp (__yp_domain, indomain)
      && ypmatch_find (inmap, inkey,
                       inkeylen, &yprv.valdat.dptr, &yprv.valdat.dsize))
    {
      *outvallen = yprv.valdat.dsize;
      *outval = (char *) malloc (*outvallen + 2);
      bcopy (yprv.valdat.dptr, *outval, *outvallen);
      (*outval)[*outvallen] = '\n';
      (*outval)[*outvallen + 1] = '\0';
      return 0;
    }
#endif
  
  tv.tv_sec = __yplib_timeout;
  tv.tv_usec = 0;
  
  yprk.domain = indomain;
  yprk.map = inmap;
  yprk.keydat.dptr = inkey;
  yprk.keydat.dsize = inkeylen;
  
  bzero ((char *) &yprv, sizeof yprv);
  
  r = clnt_call (ysd->dom_client, YPPROC_MATCH,
                 xdr_ypreq_key, &yprk,
                 xdr_ypresp_val, &yprv,
                 tv);
  if (r != RPC_SUCCESS)
    {
      clnt_perror (ysd->dom_client, "yp_match: clnt_call");
      ysd->dom_vers = -1;
      goto again;
    }
  if (!(r = ypprot_err (yprv.status)))
    {
      *outvallen = yprv.valdat.dsize;
      *outval = (char *) malloc (*outvallen + 2);
      bcopy (yprv.valdat.dptr, *outval, *outvallen);
      (*outval)[*outvallen] = '\n';
      (*outval)[*outvallen + 1] = '\0';
#ifdef YPMATCHCACHE
      if (strcmp (__yp_domain, indomain) == 0)
        ypmatch_add (inmap, inkey, inkeylen, *outval, *outvallen);
#endif
    }
  xdr_free (xdr_ypresp_val, (char *) &yprv);
  __yp_unbind (ysd);
  return r;
}

int
yp_get_default_domain (char **domp)
{
  *domp = NULL;
  if ('\0' == __yp_domain[0])
    if (getdomainname (__yp_domain, sizeof __yp_domain))
      return YPERR_NODOM;
  *domp = __yp_domain;
  return 0;
}

int
yp_first (char *indomain, char *inmap, char **outkey, int *outkeylen, char **outval, int *outvallen)
{
  struct ypresp_key_val yprkv;
  struct ypreq_nokey yprnk;
  struct dom_binding *ysd;
  struct timeval tv;
  int r;

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

  again:
  if (__yp_dobind (indomain, &ysd) != 0)
    return YPERR_DOMAIN;
  
  tv.tv_sec = __yplib_timeout;
  tv.tv_usec = 0;
  
  yprnk.domain = indomain;
  yprnk.map = inmap;
  bzero ((char *) &yprkv, sizeof yprkv);
  
  r = clnt_call (ysd->dom_client, YPPROC_FIRST,
                 xdr_ypreq_nokey, &yprnk,
                 xdr_ypresp_key_val, &yprkv,
                 tv);
  if (r != RPC_SUCCESS)
    {
      clnt_perror (ysd->dom_client, "yp_first: clnt_call");
      ysd->dom_vers = -1;
      goto again;
    }
  if (!(r = ypprot_err (yprkv.status)))
    {
      *outkeylen = yprkv.keydat.dsize;
      *outkey = (char *) malloc (*outkeylen + 2);
      bcopy (yprkv.keydat.dptr, *outkey, *outkeylen);
      (*outkey)[*outkeylen] = '\n';
      (*outkey)[*outkeylen + 1] = '\0';
      *outvallen = yprkv.valdat.dsize;
      *outval = (char *) malloc (*outvallen + 2);
      bcopy (yprkv.valdat.dptr, *outval, *outvallen);
      (*outval)[*outvallen] = '\n';
      (*outval)[*outvallen + 1] = '\0';
    }
  xdr_free (xdr_ypresp_key_val, (char *) &yprkv);
  __yp_unbind (ysd);
  return r;
}

int
yp_next (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 dom_binding *ysd;
  struct timeval tv;
  int r;
  
  *outkey = *outval = NULL;
  *outkeylen = *outvallen = 0;
  
  again:
  if (__yp_dobind (indomain, &ysd) != 0)
    return YPERR_DOMAIN;
  
  tv.tv_sec = __yplib_timeout;
  tv.tv_usec = 0;
  
  yprk.domain = indomain;
  yprk.map = inmap;
  yprk.keydat.dptr = inkey;
  yprk.keydat.dsize = inkeylen;
  bzero ((char *) &yprkv, sizeof yprkv);
  
  r = clnt_call (ysd->dom_client, YPPROC_NEXT,
                 xdr_ypreq_key, &yprk, xdr_ypresp_key_val, &yprkv, tv);
  if (r != RPC_SUCCESS)
    {
      clnt_perror (ysd->dom_client, "yp_next: clnt_call");
      ysd->dom_vers = -1;
      goto again;
    }
  if (!(r = ypprot_err (yprkv.status)))
    {
      *outkeylen = yprkv.keydat.dsize;
      *outkey = (char *) malloc (*outkeylen + 2);
      bcopy (yprkv.keydat.dptr, *outkey, *outkeylen);
      (*outkey)[*outkeylen] = '\n';
      (*outkey)[*outkeylen + 1] = '\0';
      *outvallen = yprkv.valdat.dsize;
      *outval = (char *) malloc (*outvallen + 2);
      bcopy (yprkv.valdat.dptr, *outval, *outvallen);
      (*outval)[*outvallen] = '\n';
      (*outval)[*outvallen + 1] = '\0';
    }
  xdr_free (xdr_ypresp_key_val, (char *) &yprkv);
  __yp_unbind (ysd);
  return r;
}

int
yp_all (char *indomain, char *inmap, struct ypall_callback *incallback)
{
  struct ypreq_nokey yprnk;
  struct dom_binding *ysd;
  struct timeval tv;
  struct sockaddr_in clnt_sin;
  CLIENT *clnt;
  u_long status;
  int clnt_sock;
  
  if (__yp_dobind (indomain, &ysd) != 0)
    return YPERR_DOMAIN;
  
  tv.tv_sec = __yplib_timeout;
  tv.tv_usec = 0;
  clnt_sock = RPC_ANYSOCK;
  clnt_sin = ysd->dom_server_addr;
  clnt_sin.sin_port = 0;
  clnt = clnttcp_create (&clnt_sin, YPPROG, YPVERS, &clnt_sock, 0, 0);
  if (NULL == clnt)
    {
      printf ("clnttcp_create failed\n");
      return YPERR_PMAP;
    }
  
  yprnk.domain = indomain;
  yprnk.map = inmap;
  ypresp_allfn = incallback->foreach;
  ypresp_data = (void *) incallback->data;
  
  (void) clnt_call (clnt, YPPROC_ALL,
		  xdr_ypreq_nokey, &yprnk, xdr_ypresp_all_seq, &status, tv);
  clnt_destroy (clnt);
  xdr_free (xdr_ypresp_all_seq, (char *) &status);	/* not really needed... */
  __yp_unbind (ysd);
  
  if (status != YP_FALSE)
    return ypprot_err (status);
  return 0;
}

int
yp_order (char *indomain, char *inmap, int *outorder)
{
  struct dom_binding *ysd;
  struct ypresp_order ypro;
  struct ypreq_nokey yprnk;
  struct timeval tv;
  int r;
  
  again:
  if (__yp_dobind (indomain, &ysd) != 0)
    return YPERR_DOMAIN;
  
  tv.tv_sec = __yplib_timeout;
  tv.tv_usec = 0;
  
  yprnk.domain = indomain;
  yprnk.map = inmap;
  
  bzero ((char *) (char *) &ypro, sizeof ypro);
  
  r = clnt_call (ysd->dom_client, YPPROC_ORDER,
                 xdr_ypreq_nokey, &yprnk, xdr_ypresp_order, &ypro, tv);
  if (r != RPC_SUCCESS)
    {
      clnt_perror (ysd->dom_client, "yp_order: clnt_call");
      ysd->dom_vers = -1;
      goto again;
    }

  *outorder = ypro.ordernum;
  xdr_free (xdr_ypresp_order, (char *) &ypro);
  __yp_unbind (ysd);
  return ypprot_err (ypro.status);
}

int
yp_master (char *indomain, char *inmap, char **outname)
{
  struct dom_binding *ysd;
  struct ypresp_master yprm;
  struct ypreq_nokey yprnk;
  struct timeval tv;
  int r;
  
  again:
  if (__yp_dobind (indomain, &ysd) != 0)
    return YPERR_DOMAIN;
  
  tv.tv_sec = __yplib_timeout;
  tv.tv_usec = 0;

  yprnk.domain = indomain;
  yprnk.map = inmap;
  
  bzero ((char *) &yprm, sizeof yprm);

  r = clnt_call (ysd->dom_client, YPPROC_MASTER,
                 xdr_ypreq_nokey, &yprnk, xdr_ypresp_master, &yprm, tv);
  if (r != RPC_SUCCESS)
    {
      clnt_perror (ysd->dom_client, "yp_master: clnt_call");
      ysd->dom_vers = -1;
      goto again;
    }
  if (!(r = ypprot_err (yprm.status)))
    {
      *outname = (char *) strdup (yprm.master);
    }
  xdr_free (xdr_ypresp_master, (char *) &yprm);
  __yp_unbind (ysd);
  return r;
}

int
yp_maplist (char *indomain, struct ypmaplist **outmaplist)
{
  struct dom_binding *ysd;
  struct ypresp_maplist ypml;
  struct timeval tv;
  int r;
  
  again:
  if (__yp_dobind (indomain, &ysd) != 0)
    return YPERR_DOMAIN;
  
  tv.tv_sec = __yplib_timeout;
  tv.tv_usec = 0;
  
  bzero ((char *) &ypml, sizeof ypml);
  
  r = clnt_call (ysd->dom_client, YPPROC_MAPLIST,
                 xdr_domainname, indomain, xdr_ypresp_maplist, &ypml, tv);
  if (r != RPC_SUCCESS)
    {
      clnt_perror (ysd->dom_client, "yp_maplist: clnt_call");
      ysd->dom_vers = -1;
      goto again;
    }
  *outmaplist = ypml.list;
      /* NO: xdr_free(xdr_ypresp_maplist, &ypml);*/
  __yp_unbind (ysd);
  return ypprot_err (ypml.status);
}

char *
yperr_string (int incode)
{
  static char err[80];
  
  switch (incode)
    {
    case 0:
      return "Success";
    case YPERR_BADARGS:
      return "Request arguments bad";
    case YPERR_RPC:
      return "RPC failure";
    case YPERR_DOMAIN:
      return "Can't bind to server which serves this domain";
    case YPERR_MAP:
      return "No such map in server's domain";
    case YPERR_KEY:
      return "No such key in map";
    case YPERR_YPERR:
      return "YP server error";
    case YPERR_RESRC:
      return "Local resource allocation failure";
    case YPERR_NOMORE:
      return "No more records in map database";
    case YPERR_PMAP:
      return "Can't communicate with portmapper";
    case YPERR_YPBIND:
      return "Can't communicate with ypbind";
    case YPERR_YPSERV:
      return "Can't communicate with ypserv";
    case YPERR_NODOM:
      return "Local domain name not set";
    case YPERR_BADDB:
      return "Server data base is bad";
    case YPERR_VERS:
      return "YP server version mismatch - server can't supply service.";
    case YPERR_ACCESS:
      return "Access violation";
    case YPERR_BUSY:
      return "Database is busy";
    }
  sprintf (err, "YP unknown error %d\n", incode);
  return err;
}

int
ypprot_err (long int incode)
{
  switch (incode)
    {
    case YP_TRUE:
      return 0;
    case YP_FALSE:
      return YPERR_YPBIND;
    case YP_NOMORE:
      return YPERR_NOMORE;
    case YP_NOMAP:
      return YPERR_MAP;
    case YP_NODOM:
      return YPERR_NODOM;
    case YP_NOKEY:
      return YPERR_KEY;
    case YP_BADOP:
      return YPERR_YPERR;
    case YP_BADDB:
      return YPERR_BADDB;
    case YP_YPERR:
      return YPERR_YPERR;
    case YP_BADARGS:
      return YPERR_BADARGS;
    case YP_VERS:
      return YPERR_VERS;
    }
  return YPERR_YPERR;
}

int
__yp_check (char **dom)
{
  char *unused;
  
  if ('\0' == __yp_domain[0])
    if (yp_get_default_domain (&unused))
      return 0;
#ifdef __linux__
  /* If you didn't specify the domain name while building the Linux
   * kernel, your domain name will be set to "(none)".
   */
    else
      if (strcmp(__yp_domain,"(none)") == 0)
	return 0;
#endif
  
  if (dom)
    *dom = __yp_domain;
  
  if (yp_bind (__yp_domain) == 0)
    return 1;
  return 0;
}