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 #include "mt.h"
39 #include <stdlib.h>
40 #include <unistd.h>
41 #include <rpc/rpc.h>
42 #include <sys/types.h>
43 #include "yp_b.h"
44 #include <rpcsvc/yp_prot.h>
45 #include <rpcsvc/ypclnt.h>
46 #include <string.h>
47
48 static int domaster(char *, char *, struct dom_binding *, struct timeval,
49 char **);
50 extern int __yp_master_rsvdport(char *, char *, char **);
51
52 /*
53 * This checks parameters, and implements the outer "until binding success"
54 * loop.
55 */
56 int
yp_master(char * domain,char * map,char ** master)57 yp_master(char *domain, char *map, char **master)
58 {
59 size_t domlen;
60 size_t maplen;
61 int reason;
62 struct dom_binding *pdomb;
63
64 if ((map == NULL) || (domain == NULL))
65 return (YPERR_BADARGS);
66
67 domlen = strlen(domain);
68 maplen = strlen(map);
69
70 if ((domlen == 0) || (domlen > YPMAXDOMAIN) ||
71 (maplen == 0) || (maplen > YPMAXMAP) ||
72 (master == NULL))
73 return (YPERR_BADARGS);
74
75 for (;;) {
76
77 if (reason = __yp_dobind(domain, &pdomb))
78 return (reason);
79
80 if (pdomb->dom_binding->ypbind_hi_vers >= YPVERS) {
81
82 reason = domaster(domain, map, pdomb, _ypserv_timeout,
83 master);
84
85 __yp_rel_binding(pdomb);
86 if (reason == YPERR_RPC) {
87 yp_unbind(domain);
88 (void) sleep(_ypsleeptime);
89 } else {
90 break;
91 }
92 } else {
93 __yp_rel_binding(pdomb);
94 return (YPERR_VERS);
95 }
96 }
97
98 if (reason == YPERR_MAP && geteuid() == 0) {
99 /*
100 * Lookup could be for a secure map; fail over to retry
101 * from a reserved port. Only useful to try this if we're
102 * the super user.
103 */
104 int rsvdreason;
105 rsvdreason = __yp_master_rsvdport(domain, map, master);
106 if (rsvdreason == 0)
107 reason = rsvdreason;
108 }
109
110 return (reason);
111 }
112
113
114 /*
115 * This function is identical to 'yp_master' with the exception that it calls
116 * '__yp_dobind_rsvdport' rather than '__yp_dobind'
117 */
118 int
__yp_master_rsvdport(char * domain,char * map,char ** master)119 __yp_master_rsvdport(char *domain, char *map, char **master)
120 {
121 size_t domlen;
122 size_t maplen;
123 int reason;
124 struct dom_binding *pdomb;
125
126 if ((map == NULL) || (domain == NULL))
127 return (YPERR_BADARGS);
128
129 domlen = strlen(domain);
130 maplen = strlen(map);
131
132 if ((domlen == 0) || (domlen > YPMAXDOMAIN) ||
133 (maplen == 0) || (maplen > YPMAXMAP) ||
134 (master == NULL))
135 return (YPERR_BADARGS);
136
137 for (;;) {
138
139 if (reason = __yp_dobind_rsvdport(domain, &pdomb))
140 return (reason);
141
142 if (pdomb->dom_binding->ypbind_hi_vers >= YPVERS) {
143
144 reason = domaster(domain, map, pdomb, _ypserv_timeout,
145 master);
146
147 /*
148 * Have to free the binding since the reserved
149 * port bindings are not cached.
150 */
151 __yp_rel_binding(pdomb);
152 free_dom_binding(pdomb);
153 if (reason == YPERR_RPC) {
154 yp_unbind(domain);
155 (void) sleep(_ypsleeptime);
156 } else {
157 break;
158 }
159 } else {
160 /*
161 * Have to free the binding since the reserved
162 * port bindings are not cached.
163 */
164 __yp_rel_binding(pdomb);
165 free_dom_binding(pdomb);
166 return (YPERR_VERS);
167 }
168 }
169 return (reason);
170 }
171
172 /*
173 * This talks v2 to ypserv
174 */
175 static int
domaster(char * domain,char * map,struct dom_binding * pdomb,struct timeval timeout,char ** master)176 domaster(char *domain, char *map, struct dom_binding *pdomb,
177 struct timeval timeout, char **master)
178 {
179 struct ypreq_nokey req;
180 struct ypresp_master resp;
181 unsigned int retval = 0;
182
183 req.domain = domain;
184 req.map = map;
185 (void) memset(&resp, 0, sizeof (struct ypresp_master));
186
187 /*
188 * Do the get_master request. If the rpc call failed, return with
189 * status from this point.
190 */
191
192 if (clnt_call(pdomb->dom_client,
193 YPPROC_MASTER, (xdrproc_t)xdr_ypreq_nokey,
194 (char *)&req, (xdrproc_t)xdr_ypresp_master, (char *)&resp,
195 timeout) != RPC_SUCCESS)
196 return (YPERR_RPC);
197
198 /* See if the request succeeded */
199
200 if (resp.status != YP_TRUE)
201 retval = ypprot_err(resp.status);
202
203 /* Get some memory which the user can get rid of as they like */
204
205 if (!retval && ((*master = malloc(strlen(resp.master) + 1)) == NULL))
206 retval = YPERR_RESRC;
207
208 if (!retval)
209 (void) strcpy(*master, resp.master);
210
211 CLNT_FREERES(pdomb->dom_client,
212 (xdrproc_t)xdr_ypresp_master, (char *)&resp);
213 return (retval);
214 }
215