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 #include <strings.h>
34 #endif
35
36 #if defined(__linux__) || defined(_ALLBSD_SOURCE)
37 #include <string.h>
38 #endif
39
40 #include "jni.h"
41
42 #ifndef MAXDNAME
43 #define MAXDNAME 1025
44 #endif
45
46
47 /*
48 * Class: sun_net_dns_ResolverConfgurationImpl
49 * Method: localDomain0
50 * Signature: ()Ljava/lang/String;
51 */
52 JNIEXPORT jstring JNICALL
Java_sun_net_dns_ResolverConfigurationImpl_localDomain0(JNIEnv * env,jclass cls)53 Java_sun_net_dns_ResolverConfigurationImpl_localDomain0(JNIEnv *env, jclass cls)
54 {
55 /*
56 * On Solaris the LOCALDOMAIN environment variable has absolute
57 * priority.
58 */
59 #ifdef __solaris__
60 {
61 char *cp = getenv("LOCALDOMAIN");
62 if (cp != NULL) {
63 jstring s = (*env)->NewStringUTF(env, cp);
64 return s;
65 }
66 }
67 #endif
68 return (jstring)NULL;
69 }
70
71 /*
72 * Class: sun_net_dns_ResolverConfgurationImpl
73 * Method: loadConfig0
74 * Signature: ()Ljava/lang/String;
75 */
76 JNIEXPORT jstring JNICALL
Java_sun_net_dns_ResolverConfigurationImpl_fallbackDomain0(JNIEnv * env,jclass cls)77 Java_sun_net_dns_ResolverConfigurationImpl_fallbackDomain0(JNIEnv *env, jclass cls)
78 {
79 char buf[MAXDNAME];
80
81 /*
82 * On Solaris if domain or search directives aren't specified
83 * in /etc/resolv.conf then sysinfo or gethostname is used to
84 * determine the domain name.
85 *
86 * On Linux if domain or search directives aren't specified
87 * then gethostname is used.
88 */
89
90 #ifdef __solaris__
91 {
92 int ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf));
93
94 if ((ret > 0) && (ret<sizeof(buf))) {
95 char *cp;
96 jstring s;
97
98 if (buf[0] == '+') {
99 buf[0] = '.';
100 }
101 cp = strchr(buf, '.');
102 if (cp == NULL) {
103 s = (*env)->NewStringUTF(env, buf);
104 } else {
105 s = (*env)->NewStringUTF(env, cp+1);
106 }
107 return s;
108 }
109 }
110 #endif
111
112 if (gethostname(buf, sizeof(buf)) == 0) {
113 char *cp;
114
115 /* gethostname doesn't null terminate if insufficient space */
116 buf[sizeof(buf)-1] = '\0';
117
118 cp = strchr(buf, '.');
119 if (cp != NULL) {
120 jstring s = (*env)->NewStringUTF(env, cp+1);
121 return s;
122 }
123 }
124
125 return (jstring)NULL;
126 }
127