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全网第一篇SIP协议之GB28181注册(JAVA版本)

日期：2018-11-22点击：650收藏

鉴于网上大部分关于SIP注册服务器编写都是C/C++/python，故开此贴，JAVA实现也贴出分享

GB28181定义了了基于SIP架构的视频监控互联规范，而对于多数私有协议实现的监控系统如果想接入SIP架构，就要借助网关，GB28181 规范了实现 SIP 监控域与非SIP 监控域互联。

以下是我在实际使用过程中总结的一些问题：
1. 当客户端第一次接入时，客户端将持续向Server端发送REGISTER消息，直到Server端回复"200 OK"后结束；
2. GB28181的注册流程牵扯用户认证，所以相对比较复杂，不过这也是安防通讯安全方面的一个亮点；
它的注册流程如下图：

用抓包工具看，如下图所示

注册流程：
1. 客户端向服务器无限期发送Register消息：
这里客户端期初发送的Register消息为最简单的消息

2.当服务器接收到消息后，回送一个 401 消息“Unauthorized”，并在消息包头添加如下字段：

如下所示,这就是客户端接到401-Unauthorized之后再次发来的REGISTER消息，并且还附带了Auth字段, 而第一次REGISTER消息是没有这个字段的：

完整的401回复如下（通过抓包工具Wireshark抓到的）：

Via: SIP/2.0/UDP 172.24.20.109:5060;rport=5060;received=172.24.20.109;branch=z9hG4bK352707374
From: <sip:34020000001320000002@172.24.20.109:5060>;tag=2109371333
To: <sip:34020000001320000002@172.24.20.109:5060>;tag=888
Call-ID: 545122524@172.24.20.109
CSeq: 1 REGISTER
WWW-Authenticate: Digest realm="3402000000",nonce="1677f194104d46aea6c9f8aebe507017"
Content-Length: 0

第二次REGISTER，也就是附带了Auth字段的报文：

ìKC8¯)à¯Eóßz@@×Ç¬m¬ÄÄßyÁREGISTER sip:34020000002000000001@172.24.20.26:5060 SIP/2.0
Via: SIP/2.0/UDP 172.24.20.109:5060;rport;branch=z9hG4bK742316145
Route: <sip:34020000001320000002@172.24.20.26:5060;lr>
From: <sip:34020000001320000002@172.24.20.109:5060>;tag=2109371333
To: <sip:34020000001320000002@172.24.20.109:5060>
Call-ID: 545122524@172.24.20.109
CSeq: 2 REGISTER
Contact: <sip:34020000001320000002@172.24.20.109:5060>
Authorization: Digest username="34020000001320000002", realm="3402000000", nonce="1677f194104d46aea6c9f8aebe507017", uri="sip:34020000002000000001@172.24.20.26:5060", response="dca920f418cecae456bc1566c5ac7da5", algorithm=MD5
Max-Forwards: 70
User-Agent: SIP UAS V2.1.2.438058
Expires: 3600
Content-Length: 0

验证算法如下：
HA1=MD5(username:realm:passwd) #username和realm在字段“Authorization”中可以找到，passwd这个是由客户端和服务器协商得到的，一般情况下UAC端存一个UAS也知道的密码就行了
HA2=MD5(Method:Uri) #Method一般有INVITE, ACK, OPTIONS, BYE, CANCEL, REGISTER；Uri可以在字段“Authorization”找到
response = MD5(HA1:nonce:HA2)

算法来源：http://tools.ietf.org/html/rfc2069 [Page 6]

关键认证算法的JAVA实现（注意冒号是必须要的）：

public static void main(String[] args) throws Exception {
	String ha1 = md5("34020000001320000002" + ":" + "3402000000" + ":" + "admin123", "");  //HA1=MD5(username:realm:passwd) 
	String ha2 = md5("REGISTER" + ":" + "sip:34020000002000000001@172.24.20.26:5060", ""); //HA2=MD5(Method:Uri) 

	String response = ha1 + ":" + "326d59f91b6e448fa461fcacd9161abe" + ":" + ha2;
	System.out.println("MD5加密后的字符串为:encodeStr="+md5(response, ""));
}

MD5工具类

import org.apache.commons.codec.digest.DigestUtils;

public class MD5Utils {
	/**
     * MD5方法
     * 
     * @param text 明文
     * @param key 密钥
     * @return 密文
     * @throws Exception
     */
    public static String md5(String text, String key) {
        //加密后的字符串
        String encodeStr=DigestUtils.md5Hex(text + key);
        return encodeStr;
    }

    /**
     * MD5验证方法
     * 
     * @param text 明文
     * @param key 密钥
     * @param md5 密文
     * @return true/false
     * @throws Exception
     */
    public static boolean verify(String text, String key, String md5) throws Exception {
        //根据传入的密钥进行验证
        String md5Text = md5(text, key);
        if(md5Text.equalsIgnoreCase(md5)) {
            System.out.println("MD5验证通过");
            return true;
        }
        return false;
    }
    
    
}

最后运行流程如下：

注册服务器核心代码：

import java.text.ParseException;
import java.util.TooManyListenersException;

import javax.sip.InvalidArgumentException;
import javax.sip.ObjectInUseException;
import javax.sip.PeerUnavailableException;
import javax.sip.SipException;
import javax.sip.TransportNotSupportedException;

import org.apache.commons.lang.exception.ExceptionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SIPMain {
	
	protected Logger logger = LoggerFactory.getLogger(SIPMain.class);

	public void run() {
		//用户名,IP地址,端口
		try {
			int port = 5060;
			SipLayer sipLayer = new SipLayer("admin" , "172.24.20.26" , port);  //本地
			//SipLayer sipLayer = new SipLayer("admin","xx.xx.xx.xx",port); //阿里云上的IP  VECS01532
			sipLayer.setMessageProcessor(new MessageProcessorImpl());
			System.out.println("服务启动完毕, 已经在"+port+"端口监听消息\n\n");
		} catch (PeerUnavailableException e) {
			e.printStackTrace();
			logger.error(ExceptionUtils.getFullStackTrace(e));
		} catch (TransportNotSupportedException e) {
			e.printStackTrace();
			logger.error(ExceptionUtils.getFullStackTrace(e));
		} catch (ObjectInUseException e) {
			e.printStackTrace();
			logger.error(ExceptionUtils.getFullStackTrace(e));
		} catch (InvalidArgumentException e) {
			e.printStackTrace();
			logger.error(ExceptionUtils.getFullStackTrace(e));
		} catch (TooManyListenersException e) {
			e.printStackTrace();
			logger.error(ExceptionUtils.getFullStackTrace(e));
		} 
	}
	
	
	/**
	 * 这个方法暂时用不上，目前系统没有需要主动发送消息给SIP终端设备的业务场景
	 * @throws InvalidArgumentException
	 * @throws TooManyListenersException
	 * @throws ParseException
	 * @throws SipException
	 */
	public void sendMsg() throws InvalidArgumentException, TooManyListenersException, ParseException, SipException{
		SipLayer sipLayer = new SipLayer("admin","127.0.0.1",5060);
		sipLayer.sendMessage(sipLayer.getUsername(), sipLayer.getHost(), "test message");
	}

}

SipLayer.java代码:

import java.text.ParseException;
import java.util.ArrayList;
import java.util.Properties;
import java.util.TooManyListenersException;

import javax.sip.DialogTerminatedEvent;
import javax.sip.IOExceptionEvent;
import javax.sip.InvalidArgumentException;
import javax.sip.ListeningPoint;
import javax.sip.ObjectInUseException;
import javax.sip.PeerUnavailableException;
import javax.sip.RequestEvent;
import javax.sip.ResponseEvent;
import javax.sip.SipException;
import javax.sip.SipFactory;
import javax.sip.SipListener;
import javax.sip.SipProvider;
import javax.sip.SipStack;
import javax.sip.TimeoutEvent;
import javax.sip.TransactionTerminatedEvent;
import javax.sip.TransportNotSupportedException;
import javax.sip.address.Address;
import javax.sip.address.AddressFactory;
import javax.sip.address.SipURI;
import javax.sip.header.CSeqHeader;
import javax.sip.header.CallIdHeader;
import javax.sip.header.ContactHeader;
import javax.sip.header.ContentTypeHeader;
import javax.sip.header.FromHeader;
import javax.sip.header.HeaderFactory;
import javax.sip.header.MaxForwardsHeader;
import javax.sip.header.ToHeader;
import javax.sip.header.ViaHeader;
import javax.sip.message.MessageFactory;
import javax.sip.message.Request;
import javax.sip.message.Response;


public class SipLayer implements SipListener {
	
	private MessageProcessor messageProcessor;

	private String username;

	private SipStack sipStack;

	private SipFactory sipFactory;

	private AddressFactory addressFactory;

	private HeaderFactory headerFactory;

	private MessageFactory messageFactory;

	private SipProvider sipProvider;

	/** Here we initialize the SIP stack. */
	@SuppressWarnings("deprecation")
	public SipLayer(String username, String ip, int port) throws PeerUnavailableException,
			TransportNotSupportedException, InvalidArgumentException, ObjectInUseException, TooManyListenersException {
		setUsername(username);
		sipFactory = SipFactory.getInstance();
		sipFactory.setPathName("gov.nist");
		Properties properties = new Properties();
		properties.setProperty("javax.sip.STACK_NAME", "cameraReg");
		properties.setProperty("javax.sip.IP_ADDRESS", ip);

		/**
		 * sip_server_log.log 和 sip_debug_log.log
		 * 	public static final int TRACE_NONE = 0;
			public static final int TRACE_MESSAGES = 16;
			public static final int TRACE_EXCEPTION = 17;
			public static final int TRACE_DEBUG = 32;
		 */
		properties.setProperty("gov.nist.javax.sip.TRACE_LEVEL", "16"); 
		properties.setProperty("gov.nist.javax.sip.SERVER_LOG", "sip_server_log");
		properties.setProperty("gov.nist.javax.sip.DEBUG_LOG", "sip_debug_log");

		sipStack = sipFactory.createSipStack(properties);
		headerFactory = sipFactory.createHeaderFactory();
		addressFactory = sipFactory.createAddressFactory();
		messageFactory = sipFactory.createMessageFactory();

		ListeningPoint tcp = sipStack.createListeningPoint(port, "tcp");
		ListeningPoint udp = sipStack.createListeningPoint(port, "udp");

		sipProvider = sipStack.createSipProvider(tcp);
		sipProvider.addSipListener(this);
		sipProvider = sipStack.createSipProvider(udp);
		sipProvider.addSipListener(this);
	}

	/**
	 * This method uses the SIP stack to send a message. 第一个参数：用户名 第二个参数：IP地址
	 * 第三个参数：消息内容
	 */
	public void sendMessage(String username, String address, String message)
			throws ParseException, InvalidArgumentException, SipException {

		SipURI from = addressFactory.createSipURI(getUsername(), getHost() + ":" + getPort());
		Address fromNameAddress = addressFactory.createAddress(from);
		fromNameAddress.setDisplayName(getUsername());
		FromHeader fromHeader = headerFactory.createFromHeader(fromNameAddress, "cameraReg1.0");

		SipURI toAddress = addressFactory.createSipURI(username, address);
		Address toNameAddress = addressFactory.createAddress(toAddress);
		toNameAddress.setDisplayName(username);
		ToHeader toHeader = headerFactory.createToHeader(toNameAddress, null);

		SipURI requestURI = addressFactory.createSipURI(username, address);
		requestURI.setTransportParam("udp");

		ArrayList<ViaHeader> viaHeaders = new ArrayList<ViaHeader>();
		ViaHeader viaHeader = headerFactory.createViaHeader(getHost(), getPort(), "udp", "branch1");
		viaHeaders.add(viaHeader);

		CallIdHeader callIdHeader = sipProvider.getNewCallId();

		@SuppressWarnings("deprecation")
		CSeqHeader cSeqHeader = headerFactory.createCSeqHeader(1, Request.MESSAGE);

		MaxForwardsHeader maxForwards = headerFactory.createMaxForwardsHeader(70);

		Request request = messageFactory.createRequest(requestURI, Request.MESSAGE, callIdHeader, cSeqHeader,
				fromHeader, toHeader, viaHeaders, maxForwards);

		SipURI contactURI = addressFactory.createSipURI(getUsername(), getHost());
		contactURI.setPort(getPort());
		Address contactAddress = addressFactory.createAddress(contactURI);
		contactAddress.setDisplayName(getUsername());
		ContactHeader contactHeader = headerFactory.createContactHeader(contactAddress);
		request.addHeader(contactHeader);

		ContentTypeHeader contentTypeHeader = headerFactory.createContentTypeHeader("text", "plain");
		request.setContent(message, contentTypeHeader);

		sipProvider.sendRequest(request);
	}

	/** This method is called by the SIP stack when a response arrives. */
	public void processResponse(ResponseEvent evt) {
		Response response = evt.getResponse();
		int status = response.getStatusCode();

		if ((status >= 200) && (status < 300)) { // Success!
			messageProcessor.processInfo("--Sent");
			return;
		}

		messageProcessor.processError("Previous message not sent: " + status);
	}

	/**
	 * SIP服务端接收消息的方法
	 * Content 里面是GBK编码
	 * This method is called by the SIP stack when a new request arrives.
	 */
	public void processRequest(RequestEvent evt) {
		Request req = evt.getRequest();
		messageProcessor.processMessage(req,messageFactory,sipProvider);
	}
	

	/**
	 * This method is called by the SIP stack when there's no answer to a
	 * message. Note that this is treated differently from an error message.
	 */
	public void processTimeout(TimeoutEvent evt) {
		messageProcessor.processError("Previous message not sent: " + "timeout");
	}

	/**
	 * This method is called by the SIP stack when there's an asynchronous
	 * message transmission error.
	 */
	public void processIOException(IOExceptionEvent evt) {
		messageProcessor.processError("Previous message not sent: " + "I/O Exception");
	}

	/**
	 * This method is called by the SIP stack when a dialog (session) ends.
	 */
	public void processDialogTerminated(DialogTerminatedEvent evt) {
	}

	/**
	 * This method is called by the SIP stack when a transaction ends.
	 */
	public void processTransactionTerminated(TransactionTerminatedEvent evt) {
	}

	@SuppressWarnings("deprecation")
	public String getHost() {
		String host = sipStack.getIPAddress();
		return host;
	}

	@SuppressWarnings("deprecation")
	public int getPort() {
		int port = sipProvider.getListeningPoint().getPort();
		return port;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String newUsername) {
		username = newUsername;
	}

	public MessageProcessor getMessageProcessor() {
		return messageProcessor;
	}

	public void setMessageProcessor(MessageProcessor newMessageProcessor) {
		messageProcessor = newMessageProcessor;
	}

}

MessageProcessor接口：

import javax.sip.SipProvider;
import javax.sip.message.MessageFactory;
import javax.sip.message.Request;

/**
 *  消息处理回调函数接口
 */
public interface MessageProcessor {
	
	/**
	 * 接收IPCamera发来的SIP协议消息的时候产生的回调函数
	 */
	public void processMessage(Request req,MessageFactory messageFactory, SipProvider sipProvider);

    public void processError(String errorMessage);

    public void processInfo(String infoMessage);
    
}

MessageProcessor实现类这里不给出，因为里面包含了很多本公司SIP注册业务的具体细节

需要提示的一点是，需要安装一个反编译工具去阅读Request源码里面的属性和方法，以获取SIP报文里面的内容

比如获取我想获取sender和method字段

FromHeader fromHeader = (FromHeader) req.getHeader("From");
String sender = fromHeader.getAddress().toString();
String method = req.getMethod();

再比如我想获取Contact字段

Contact contact = (Contact) req.getHeader("Contact");

类似于这样，关键是去通过eclipse点进去看一下这个Request的源码

最后，给出JAVA SIP协议的支持包MAVEN POM依赖：

<!-- SPI协议相关的包 -->
<dependency>
    <groupId>javax.sip</groupId>
    <artifactId>jain-sip-api</artifactId>
    <version>1.2</version>
</dependency>

<dependency>
    <groupId>javax.sip</groupId>
    <artifactId>jain-sip-ri</artifactId>
    <version>1.2</version>
</dependency>

原文链接：https://my.oschina.net/u/2338224/blog/2907136

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