1 /*
2 * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <unistd.h>
29 #include <errno.h>
30
31 #ifdef __solaris__
32 #include <sys/systeminfo.h>
33 #endif
34
35 #include <string.h>
36
37 #include "jni.h"
38
39 #ifndef MAXDNAME
40 #define MAXDNAME 1025
41 #endif
42
43
44 /*
45 * Class: sun_net_dns_ResolverConfigurationImpl
46 * Method: localDomain0
47 * Signature: ()Ljava/lang/String;
48 */
49 JNIEXPORT jstring JNICALL
Java_sun_net_dns_ResolverConfigurationImpl_localDomain0(JNIEnv * env,jclass cls)50 Java_sun_net_dns_ResolverConfigurationImpl_localDomain0(JNIEnv *env, jclass cls)
51 {
52 /*
53 * On Solaris the LOCALDOMAIN environment variable has absolute
54 * priority.
55 */
56 #ifdef __solaris__
57 {
58 char *cp = getenv("LOCALDOMAIN");
59 if (cp != NULL) {
60 jstring s = (*env)->NewStringUTF(env, cp);
61 return s;
62 }
63 }
64 #endif
65 return (jstring)NULL;
66 }
67
68 /*
69 * Class: sun_net_dns_ResolverConfigurationImpl
70 * Method: loadConfig0
71 * Signature: ()Ljava/lang/String;
72 */
73 JNIEXPORT jstring JNICALL
Java_sun_net_dns_ResolverConfigurationImpl_fallbackDomain0(JNIEnv * env,jclass cls)74 Java_sun_net_dns_ResolverConfigurationImpl_fallbackDomain0(JNIEnv *env, jclass cls)
75 {
76 char buf[MAXDNAME];
77
78 /*
79 * On Solaris if domain or search directives aren't specified
80 * in /etc/resolv.conf then sysinfo or gethostname is used to
81 * determine the domain name.
82 *
83 * On Linux if domain or search directives aren't specified
84 * then gethostname is used.
85 */
86
87 #ifdef __solaris__
88 {
89 int ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf));
90
91 if ((ret > 0) && (ret<sizeof(buf))) {
92 char *cp;
93 jstring s;
94
95 if (buf[0] == '+') {
96 buf[0] = '.';
97 }
98 cp = strchr(buf, '.');
99 if (cp == NULL) {
100 s = (*env)->NewStringUTF(env, buf);
101 } else {
102 s = (*env)->NewStringUTF(env, cp+1);
103 }
104 return s;
105 }
106 }
107 #endif
108
109 if (gethostname(buf, sizeof(buf)) == 0) {
110 char *cp;
111
112 /* gethostname doesn't null terminate if insufficient space */
113 buf[sizeof(buf)-1] = '\0';
114
115 cp = strchr(buf, '.');
116 if (cp != NULL) {
117 jstring s = (*env)->NewStringUTF(env, cp+1);
118 return s;
119 }
120 }
121
122 return (jstring)NULL;
123 }
124