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Merge pull request #872 from matthiasblaesing/hostname_utils
Improve hostname functions
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81 changes: 81 additions & 0 deletions
81
contrib/platform/src/com/sun/jna/platform/win32/Winsock2.java
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| /* Copyright (c) 2017 Matthias Bläsing, All Rights Reserved | ||
| * | ||
| * The contents of this file is dual-licensed under 2 | ||
| * alternative Open Source/Free licenses: LGPL 2.1 or later and | ||
| * Apache License 2.0. (starting with JNA version 4.0.0). | ||
| * | ||
| * You can freely decide which license you want to apply to | ||
| * the project. | ||
| * | ||
| * You may obtain a copy of the LGPL License at: | ||
| * | ||
| * http://www.gnu.org/licenses/licenses.html | ||
| * | ||
| * A copy is also included in the downloadable source code package | ||
| * containing JNA, in file "LGPL2.1". | ||
| * | ||
| * You may obtain a copy of the Apache License at: | ||
| * | ||
| * http://www.apache.org/licenses/ | ||
| * | ||
| * A copy is also included in the downloadable source code package | ||
| * containing JNA, in file "AL2.0". | ||
| */ | ||
| package com.sun.jna.platform.win32; | ||
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| import com.sun.jna.Library; | ||
| import com.sun.jna.Native; | ||
| import com.sun.jna.win32.W32APIOptions; | ||
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| public interface Winsock2 extends Library { | ||
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| Winsock2 INSTANCE = (Winsock2) Native.loadLibrary("ws2_32", Winsock2.class, W32APIOptions.ASCII_OPTIONS); | ||
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| /** | ||
| * The gethostname function retrieves the standard host name for the local | ||
| * computer. | ||
| * | ||
| * <p> | ||
| * <strong>Remarks</strong></p> | ||
| * | ||
| * <p> | ||
| * The gethostname function returns the name of the local host into the | ||
| * buffer specified by the name parameter. The host name is returned as a | ||
| * null-terminated string. The form of the host name is dependent on the | ||
| * Windows Sockets provider—it can be a simple host name, or it can be a | ||
| * fully qualified domain name. However, it is guaranteed that the name | ||
| * returned will be successfully parsed by gethostbyname and | ||
| * WSAAsyncGetHostByName.</p> | ||
| * | ||
| * <p> | ||
| * The maximum length of the name returned in the buffer pointed to by the | ||
| * name parameter is dependent on the namespace provider.</p> | ||
| * | ||
| * <p> | ||
| * If the gethostname function is used on a cluster resource on Windows | ||
| * Server 2008, Windows Server 2003, or Windows 2000 Server and the | ||
| * _CLUSTER_NETWORK_NAME_ environment variable is defined, then the value in | ||
| * this environment variable overrides the actual hostname and is returned. | ||
| * On a cluster resource, the _CLUSTER_NETWORK_NAME_ environment variable | ||
| * contains the name of the cluster.</p> | ||
| * | ||
| * <p> | ||
| * The gethostname function queries namespace providers to determine the | ||
| * local host name using the SVCID_HOSTNAME GUID defined in the Svgguid.h | ||
| * header file. If no namespace provider responds, then the gethostname | ||
| * function returns the NetBIOS name of the local computer.</p> | ||
| * | ||
| * <p> | ||
| * The maximum length, in bytes, of the string returned in the buffer | ||
| * pointed to by the name parameter is dependent on the namespace provider, | ||
| * but this string must be 256 bytes or less. So if a buffer of 256 bytes is | ||
| * passed in the name parameter and the namelen parameter is set to 256, the | ||
| * buffer size will always be adequate.</p> | ||
| * | ||
| * @param name A bytearray that receives the local host name. | ||
| * @param namelen The length, in bytes, of the buffer pointed to by the name parameter. | ||
| * @return If no error occurs, gethostname returns zero. Otherwise, it returns SOCKET_ERROR and a specific error code can be retrieved by calling WSAGetLastError. | ||
| */ | ||
| public int gethostname(byte[] name, int namelen); | ||
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| } |
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41
contrib/platform/test/com/sun/jna/platform/win32/Winsock2Test.java
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| /* Copyright (c) 2017 Matthias Bläsing, All Rights Reserved | ||
| * | ||
| * The contents of this file is dual-licensed under 2 | ||
| * alternative Open Source/Free licenses: LGPL 2.1 or later and | ||
| * Apache License 2.0. (starting with JNA version 4.0.0). | ||
| * | ||
| * You can freely decide which license you want to apply to | ||
| * the project. | ||
| * | ||
| * You may obtain a copy of the LGPL License at: | ||
| * | ||
| * http://www.gnu.org/licenses/licenses.html | ||
| * | ||
| * A copy is also included in the downloadable source code package | ||
| * containing JNA, in file "LGPL2.1". | ||
| * | ||
| * You may obtain a copy of the Apache License at: | ||
| * | ||
| * http://www.apache.org/licenses/ | ||
| * | ||
| * A copy is also included in the downloadable source code package | ||
| * containing JNA, in file "AL2.0". | ||
| */ | ||
| package com.sun.jna.platform.win32; | ||
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| import com.sun.jna.Native; | ||
| import org.junit.Test; | ||
| import static org.junit.Assert.*; | ||
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| public class Winsock2Test { | ||
| @Test | ||
| public void testGethostname() { | ||
| // This needs visual inspection ... | ||
| byte[] buffer = new byte[256]; | ||
| Winsock2.INSTANCE.gethostname(buffer, buffer.length); | ||
| String hostname = Native.toString(buffer); | ||
| System.out.println("Hostname: " + hostname); | ||
| assertTrue(hostname.length() > 0); | ||
| } | ||
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| } |