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_ResolverConfgurationImpl
46 * Method:    localDomain0
47 * Signature: ()Ljava/lang/String;
48 */
49JNIEXPORT jstring JNICALL
50Java_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_ResolverConfgurationImpl
70 * Method:    loadConfig0
71 * Signature: ()Ljava/lang/String;
72 */
73JNIEXPORT jstring JNICALL
74Java_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