xref: /illumos-gate/usr/src/lib/libnsl/yp/yp_master.c (revision 48bbca81)
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
yp_master(char * domain,char * map,char ** master)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
__yp_master_rsvdport(char * domain,char * map,char ** master)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
domaster(char * domain,char * map,struct dom_binding * pdomb,struct timeval timeout,char ** master)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 }
217