com.github.dockerjava.transport.BsdDomainSocket Maven / Gradle / Ivy
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/*
* Copyright 2012-2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.github.dockerjava.transport;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.List;
import com.sun.jna.LastErrorException;
import com.sun.jna.Native;
import com.sun.jna.Platform;
import com.sun.jna.Structure;
/**
* {@link DomainSocket} implementation for BSD based platforms.
*
* @author Phillip Webb
*/
class BsdDomainSocket extends DomainSocket {
private static final int MAX_PATH_LENGTH = 104;
static {
Native.register(Platform.C_LIBRARY_NAME);
}
BsdDomainSocket(String path) throws IOException {
super(path);
}
@Override
protected void connect(String path, int handle) {
SockaddrUn address = new SockaddrUn(AF_LOCAL, path.getBytes(StandardCharsets.UTF_8));
connect(handle, address, address.size());
}
private native int connect(int fd, SockaddrUn address, int addressLen) throws LastErrorException;
/**
* Native {@code sockaddr_un} structure as defined in {@code sys/un.h}.
*/
public static class SockaddrUn extends Structure implements Structure.ByReference {
public byte sunLen;
public byte sunFamily;
public byte[] sunPath = new byte[MAX_PATH_LENGTH];
private SockaddrUn(byte sunFamily, byte[] path) {
if (path.length > MAX_PATH_LENGTH) {
throw new IllegalArgumentException("Path cannot exceed " + MAX_PATH_LENGTH + " bytes");
}
System.arraycopy(path, 0, this.sunPath, 0, path.length);
this.sunPath[path.length] = 0;
this.sunLen = (byte) (fieldOffset("sunPath") + path.length);
this.sunFamily = sunFamily;
allocateMemory();
}
@Override
protected List getFieldOrder() {
return Arrays.asList("sunLen", "sunFamily", "sunPath");
}
}
}