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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * gethostbyname_r() is defined in this file. It is implemented on top of
31 * _get_hostserv_inetnetdir_byname() which is also used to implement
32 * netdir_getbyname() for inet family transports. In turn the common code
33 * uses the name service switch policy for "hosts" and "services" unless
34 * the administrator chooses to bypass the name service switch by
35 * specifying third-party supplied nametoaddr libs for inet transports
36 * in /etc/netconfig.
37 *
38 * gethostbyaddr_r() is similarly related to _get_hostserv_inetnetdir_byaddr()
39 * and netdir_getbyaddr();
40 *
41 * The common code lives in netdir_inet.c.
42 *
43 * gethostent_r(), sethostent() and endhostent() are *not* implemented on top
44 * of the common interface; they go straight to the switch and are
45 * defined in gethostent_r.c.
46 *
47 * There is absolutely no data sharing, not even the stayopen flag or
48 * enumeration state, between gethostbyYY_r() and gethostent_r();
49 */
50
51 #include "mt.h"
52 #include <netdb.h>
53 #include <netdir.h>
54 #include <sys/types.h>
55 #include <nss_netdir.h>
56 #include <string.h>
57
58 extern struct netconfig *__rpc_getconfip();
59
60 /*
61 * h_errno POLICY: The frontends expect the name service
62 * backends to modify the h_errno in "arg"; _switch_gethostbyYY_r()
63 * will copy that over onto user's h_errnop pointer. This h_errno is
64 * never used for "switching" -- status from nss_search serves
65 * the purpose. There is no explicit zeroing in the case of success.
66 */
67
68 extern struct hostent *
69 _switch_gethostbyname_r(const char *nam, struct hostent *result, char *buffer,
70 int buflen, int *h_errnop);
71
72 extern struct hostent *
73 _switch_gethostbyaddr_r(const char *addr, int length, int type,
74 struct hostent *result, char *buffer, int buflen, int *h_errnop);
75
76 #ifdef PIC
77 struct hostent *
_uncached_gethostbyname_r(const char * nam,struct hostent * result,char * buffer,int buflen,int * h_errnop)78 _uncached_gethostbyname_r(const char *nam, struct hostent *result,
79 char *buffer, int buflen, int *h_errnop)
80 {
81 return (_switch_gethostbyname_r(nam, result,
82 buffer, buflen, h_errnop));
83 }
84
85 struct hostent *
_uncached_gethostbyaddr_r(const char * addr,int length,int type,struct hostent * result,char * buffer,int buflen,int * h_errnop)86 _uncached_gethostbyaddr_r(const char *addr, int length, int type,
87 struct hostent *result, char *buffer, int buflen, int *h_errnop)
88 {
89 return (_switch_gethostbyaddr_r(addr, length, type,
90 result, buffer, buflen, h_errnop));
91 }
92
93 #endif
94
95 extern struct hostent *
96 gethostbyname_r(const char *nam, struct hostent *result, char *buffer,
97 int buflen, int *h_errnop);
98
99 extern struct hostent *
100 gethostbyaddr_r(const char *addr, int length, int type,
101 struct hostent *result, char *buffer, int buflen, int *h_errnop);
102
103 struct hostent *
gethostbyname_r(const char * nam,struct hostent * result,char * buffer,int buflen,int * h_errnop)104 gethostbyname_r(const char *nam, struct hostent *result, char *buffer,
105 int buflen, int *h_errnop)
106 {
107 struct netconfig *nconf;
108 struct nss_netdirbyname_in nssin;
109 union nss_netdirbyname_out nssout;
110 int neterr, dummy;
111
112 if (h_errnop == NULL)
113 h_errnop = &dummy;
114
115 if (strlen(nam) == 0) {
116 *h_errnop = HOST_NOT_FOUND;
117 return (NULL);
118 }
119
120 if ((nconf = __rpc_getconfip("udp")) == NULL &&
121 (nconf = __rpc_getconfip("tcp")) == NULL) {
122 *h_errnop = NO_RECOVERY;
123 return (NULL);
124 }
125
126 nssin.op_t = NSS_HOST;
127 nssin.arg.nss.host.name = nam;
128 nssin.arg.nss.host.buf = buffer;
129 nssin.arg.nss.host.buflen = buflen;
130
131 nssout.nss.host.hent = result;
132 nssout.nss.host.herrno_p = h_errnop;
133
134 /*
135 * We pass in nconf and let the implementation of the long-named func
136 * decide whether to use the switch based on nc_nlookups.
137 */
138 neterr = _get_hostserv_inetnetdir_byname(nconf, &nssin, &nssout);
139
140 (void) freenetconfigent(nconf);
141 if (neterr != ND_OK)
142 return (NULL);
143 return (nssout.nss.host.hent);
144 }
145
146 struct hostent *
gethostbyaddr_r(const char * addr,int length,int type,struct hostent * result,char * buffer,int buflen,int * h_errnop)147 gethostbyaddr_r(const char *addr, int length, int type,
148 struct hostent *result, char *buffer, int buflen, int *h_errnop)
149 {
150 struct netconfig *nconf;
151 struct nss_netdirbyaddr_in nssin;
152 union nss_netdirbyaddr_out nssout;
153 int neterr, dummy;
154
155 if (h_errnop == NULL)
156 h_errnop = &dummy;
157
158 if (type != AF_INET) {
159 *h_errnop = HOST_NOT_FOUND;
160 return (NULL);
161 }
162
163 if ((nconf = __rpc_getconfip("udp")) == NULL &&
164 (nconf = __rpc_getconfip("tcp")) == NULL) {
165 *h_errnop = NO_RECOVERY;
166 return (NULL);
167 }
168
169 nssin.op_t = NSS_HOST;
170 nssin.arg.nss.host.addr = addr;
171 nssin.arg.nss.host.len = length;
172 nssin.arg.nss.host.type = type;
173 nssin.arg.nss.host.buf = buffer;
174 nssin.arg.nss.host.buflen = buflen;
175
176 nssout.nss.host.hent = result;
177 nssout.nss.host.herrno_p = h_errnop;
178
179 /*
180 * We pass in nconf and let the implementation of this long-named func
181 * decide whether to use the switch based on nc_nlookups.
182 */
183 neterr = _get_hostserv_inetnetdir_byaddr(nconf, &nssin, &nssout);
184
185 (void) freenetconfigent(nconf);
186 if (neterr != ND_OK)
187 return (NULL);
188 return (nssout.nss.host.hent);
189 }
190