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 #include <string.h> 32 33 #include "jni.h" 34 35 #ifndef MAXDNAME 36 #define MAXDNAME 1025 37 #endif 38 39 40 /* 41 * Class: sun_net_dns_ResolverConfigurationImpl 42 * Method: loadConfig0 43 * Signature: ()Ljava/lang/String; 44 */ 45 JNIEXPORT jstring JNICALL 46 Java_sun_net_dns_ResolverConfigurationImpl_fallbackDomain0(JNIEnv *env, jclass cls) 47 { 48 char buf[MAXDNAME]; 49 50 /* 51 * If domain or search directives aren't specified 52 * then gethostname is used. 53 */ 54 55 if (gethostname(buf, sizeof(buf)) == 0) { 56 char *cp; 57 58 /* gethostname doesn't null terminate if insufficient space */ 59 buf[sizeof(buf)-1] = '\0'; 60 61 cp = strchr(buf, '.'); 62 if (cp != NULL) { 63 jstring s = (*env)->NewStringUTF(env, cp+1); 64 return s; 65 } 66 } 67 68 return (jstring)NULL; 69 }