请问这个类的源码大概是什么意思？java的

ppgjx 发表于 2023-1-20 22:38

package socks;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import server.RemoteServer;

import java.util.Arrays;

public class SocksConnectionRequest {
   /*
      * Data VER CMD RSV ATYP DST.ADDR       SDT.PORT
      *    1 1 1 1Variable          2
      *    0501000100000000          1010
      *    050100030962616964752E636F6D 0050
      * */

   private final static Logger logger = LoggerFactory.getLogger(SocksConnectionRequest.class);

   private final byte[] data;

   private byte version;
   private byte cmd;
   private byte rsv;
   private byte atyp;
   private String addr;
   private int port;

   private SocksConnectionRequest(byte[] data) {
         this.data = data;
         this.version = data;
         this.cmd = data;
         this.rsv = data;
         this.atyp = data;

         if (atyp == 0x01) { //ipv4
            addr = bytesToIpv4(Arrays.copyOfRange(data, 4, data.length - 2));
         } else if (atyp == 0x03) { //domain
            addr = bytesToDomain(Arrays.copyOfRange(data, 5, data.length - 2));
         } else if (atyp == 0x04) { //ipv6
            addr = bytesToIpv6(Arrays.copyOfRange(data, 4, data.length - 2));
         } else {
            logger.error("unknown atyp: " + atyp);
         }

         port = (data & 0xFF) * 256 + (data & 0xFF);
   }

   private static boolean validate(byte[] data) {
         if (data.length < 7) return false;
         if (data != 0x05) return false;
         if (data != 0x00) return false;
         return data == 0x01 || data == 0x03 || data == 0x04;
   }

   public static SocksConnectionRequest fromBytes(byte[] data) {
         if(validate(data)) {
            return new SocksConnectionRequest(data);
         } else {
            return null;
         }
   }

   public String getAddress() {
         return addr;
   }

   public int getDstPort() {
         return port;
   }

   private String bytesToIpv4(byte[] addrBytes) {
         String ipv4AddrString = "";
         for (byte addrByte : addrBytes) {
            ipv4AddrString = ipv4AddrString.concat((addrByte & 0xFF) + ".");
         }
         return ipv4AddrString.substring(0, ipv4AddrString.length() - 1);
   }

   private String bytesToDomain(byte[] addrBytes) {
         StringBuilder domainString = new StringBuilder(addrBytes.length);
         for (byte addrByte : addrBytes) {
            domainString.append((char) addrByte);
         }
         return domainString.toString();
   }

   private String bytesToIpv6(byte[] addrBytes) {
         String ipv6AddrString = "";
         for (byte addrByte : addrBytes) {
            ipv6AddrString = ipv6AddrString.concat(String.valueOf(addrByte) + ":");
         }
         return ipv6AddrString.substring(0, ipv6AddrString.length() - 1);
   }

}

一点都看不懂为啥还有十六进制。。。

天心阁下 发表于 2023-1-24 03:54

处理socks5的请求阶段

+----+-----+-------+-------+------------+-----------+
|VER | CMD |RSV |ATYP| DST.ADDR | DST.PORT |
+----+-----+-------+-------+------------+-----------+
| 1 | 1 |X'00'| 1 | Variable| 2 |
+----+-----+-------+-------+------------+-----------+

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请问这个类的源码大概是什么意思？java的