usr/src/lib/libc/port/nsl/yp_master.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22
  23 /*
  24  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  25  * Use is subject to license terms.
  26  * Copyright (c) 2016 by Delphix. All rights reserved.
  27  */
  28
  29 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
  30 /*        All Rights Reserved   */
  31
  32 /*
  33  * Portions of this source code were derived from Berkeley
  34  * under license from the Regents of the University of
  35  * California.
  36  */
  37
  38 #pragma ident   "%Z%%M% %I%     %E% SMI"
  39
  40 #include "mt.h"
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <rpc/rpc.h>
  44 #include <sys/types.h>
  45 #include "yp_b.h"
  46 #include <rpcsvc/yp_prot.h>
  47 #include <rpcsvc/ypclnt.h>
  48 #include <string.h>
  49
  50 static int domaster(char *, char *, struct dom_binding *, struct timeval,
  51     char **);
  52 extern int __yp_master_rsvdport(char *, char *, char **);
  53
  54 /*
  55  * This checks parameters, and implements the outer "until binding success"
  56  * loop.
  57  */
  58 int
  59 yp_master(char *domain, char *map, char **master)
  60 {
  61         size_t domlen;
  62         size_t maplen;
  63         int reason;
  64         struct dom_binding *pdomb;
  65
  66         if ((map == NULL) || (domain == NULL))
  67                 return (YPERR_BADARGS);
  68
  69         domlen = strlen(domain);
  70         maplen = strlen(map);
  71
  72         if ((domlen == 0) || (domlen > YPMAXDOMAIN) ||
  73             (maplen == 0) || (maplen > YPMAXMAP) ||
  74             (master == NULL))
  75                 return (YPERR_BADARGS);
  76
  77         for (;;) {
  78
  79                 if (reason = __yp_dobind(domain, &pdomb))
  80                         return (reason);
  81
  82                 if (pdomb->dom_binding->ypbind_hi_vers >= YPVERS) {
  83
  84                         reason = domaster(domain, map, pdomb, _ypserv_timeout,
  85                             master);
  86
  87                         __yp_rel_binding(pdomb);
  88                         if (reason == YPERR_RPC) {
  89                                 yp_unbind(domain);
  90                                 (void) sleep(_ypsleeptime);
  91                         } else {
  92                                 break;
  93                         }
  94                 } else {
  95                         __yp_rel_binding(pdomb);
  96                         return (YPERR_VERS);
  97                 }
  98         }
  99
 100         if (reason == YPERR_MAP && geteuid() == 0) {
 101                 /*
 102                  * Lookup could be for a secure map; fail over to retry
 103                  * from a reserved port. Only useful to try this if we're
 104                  * the super user.
 105                  */
 106                 int rsvdreason;
 107                 rsvdreason = __yp_master_rsvdport(domain, map, master);
 108                 if (rsvdreason == 0)
 109                         reason = rsvdreason;
 110         }
 111
 112         return (reason);
 113 }
 114
 115
 116 /*
 117  * This function is identical to 'yp_master' with the exception that it calls
 118  * '__yp_dobind_rsvdport' rather than '__yp_dobind'
 119  */
 120 int
 121 __yp_master_rsvdport(char *domain, char *map, char **master)
 122 {
 123         size_t domlen;
 124         size_t maplen;
 125         int reason;
 126         struct dom_binding *pdomb;
 127
 128         if ((map == NULL) || (domain == NULL))
 129                 return (YPERR_BADARGS);
 130
 131         domlen = strlen(domain);
 132         maplen = strlen(map);
 133
 134         if ((domlen == 0) || (domlen > YPMAXDOMAIN) ||
 135             (maplen == 0) || (maplen > YPMAXMAP) ||
 136             (master == NULL))
 137                 return (YPERR_BADARGS);
 138
 139         for (;;) {
 140
 141                 if (reason = __yp_dobind_rsvdport(domain, &pdomb))
 142                         return (reason);
 143
 144                 if (pdomb->dom_binding->ypbind_hi_vers >= YPVERS) {
 145
 146                         reason = domaster(domain, map, pdomb, _ypserv_timeout,
 147                             master);
 148
 149                         /*
 150                          * Have to free the binding since the reserved
 151                          * port bindings are not cached.
 152                          */
 153                         __yp_rel_binding(pdomb);
 154                         free_dom_binding(pdomb);
 155                         if (reason == YPERR_RPC) {
 156                                 yp_unbind(domain);
 157                                 (void) sleep(_ypsleeptime);
 158                         } else {
 159                                 break;
 160                         }
 161                 } else {
 162                         /*
 163                          * Have to free the binding since the reserved
 164                          * port bindings are not cached.
 165                          */
 166                         __yp_rel_binding(pdomb);
 167                         free_dom_binding(pdomb);
 168                         return (YPERR_VERS);
 169                 }
 170         }
 171         return (reason);
 172 }
 173
 174 /*
 175  * This talks v2 to ypserv
 176  */
 177 static int
 178 domaster(char *domain, char *map, struct dom_binding *pdomb,
 179                                         struct timeval timeout, char **master)
 180 {
 181         struct ypreq_nokey req;
 182         struct ypresp_master resp;
 183         unsigned int retval = 0;
 184
 185         req.domain = domain;
 186         req.map = map;
 187         (void) memset(&resp, 0, sizeof (struct ypresp_master));
 188
 189         /*
 190          * Do the get_master request.  If the rpc call failed, return with
 191          * status from this point.
 192          */
 193
 194         if (clnt_call(pdomb->dom_client,
 195                         YPPROC_MASTER, (xdrproc_t)xdr_ypreq_nokey,
 196                     (char *)&req, (xdrproc_t)xdr_ypresp_master, (char *)&resp,
 197                     timeout) != RPC_SUCCESS)
 198                 return (YPERR_RPC);
 199
 200         /* See if the request succeeded */
 201
 202         if (resp.status != YP_TRUE)
 203                 retval = ypprot_err(resp.status);
 204
 205         /* Get some memory which the user can get rid of as they like */
 206
 207         if (!retval && ((*master = malloc(strlen(resp.master) + 1)) == NULL))
 208                 retval = YPERR_RESRC;
 209
 210         if (!retval)
 211                 (void) strcpy(*master, resp.master);
 212
 213         CLNT_FREERES(pdomb->dom_client,
 214                 (xdrproc_t)xdr_ypresp_master, (char *)&resp);
 215         return (retval);
 216 }