1 /*

     2  * Copyright (c) 2019, 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:     jdk_dns_conf_ResolverConfiguration

    46  * Method:    localDomain0

    47  * Signature: ()Ljava/lang/String;

    48  */

    49 JNIEXPORT jstring JNICALL

    50 Java_jdk_dns_conf_DnsResolverConfiguration_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:     jdk_dns_conf_DnsResolverConfiguration

    70  * Method:    loadConfig0

    71  * Signature: ()Ljava/lang/String;

    72  */

    73 JNIEXPORT jstring JNICALL

    74 Java_jdk_dns_conf_DnsResolverConfiguration_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 }