How to decode undecoded packet which we get from getPayload method from PcapPacket?

As long as the protocol header you are trying to decode is supported or you have one written it can be done quiet easily. All you need to do is encapsulate your buffer (retrieved as payload) in a JMemoryPacket and provide the proper first header in the buffer numerical ID.

Hai Mark,

Thaks a lot for your quick reply.
I have encapsulated the JBuffer which contains payload in a JMemoryPacket.

JMemoryPacket jMPacket=new JMemoryPacket(jBuffer);

Further how to decode? can you please give me some line of code how to do that.

Regards,
Gomathi.K

You can use JMemoryPacket constructor that takes the ID of the first protocol (what there that is in the payload) or you can call JPacket.scan(int) that takes the ID.

Hai Mark,

Thank you for your reply.
byte[] payload = jNSPacket.getDataValue();

(jNSPacket---jNetStream Packet)

JMemoryPacket jMPacket = new JMemoryPacket(Ethernet.ID,payload);
System.out.println(jMPacket);

When i print jMPacket the ouput is:
Frame:
Frame: number = 185
Frame: timestamp = 2010-06-24 23:27:06.888
Frame: wire length = 252 bytes
Frame: captured length = 252 bytes
Frame:
Eth: ******* Ethernet - "Ethernet" - offset=0 (0x0) length=14
Eth:
Eth: destination = 80:8:26:3a:0:0
Eth: .... ..0. .... .... = [2] LG bit
Eth: .... ...0 .... .... = [0] IG bit
Eth: source = af:50:f3:cb:20:1
Eth: .... ..0. .... .... = [2] LG bit
Eth: .... ...0 .... .... = [0] IG bit
Eth: type = 0xE6E4 (59108)
Eth:
Data: ******* Payload offset=14 (0xE) length=238
Data:
000e: e6 de 76 54 5f 64 66 7e 7c 7e 79 79 7e 76 74 7d ..vT_df~|~yy~vt}
001e: 7d 70 77 7d 7c 74 41 c5 5e 67 df fc 76 53 f6 c0 }pw}|tA.^g..vS..
002e: cd f1 f9 ff ed e8 e7 eb 87 81 e6 f7 98 90 6f 17 ..............o.

From this i have extracted only payload (packet CONTENT),from this Data payload how to get .au sound file.

Can u please help me to save .au file from payload raw data.

Regards,
Gomathi.K

I think you are on the wrong track here. The ".au" files do not contain packets, therefore you can not use libpcap to read it like an offline pcap capture file. Ethernet is a network protocol that is also not stored in actual .au files. jNetPcap or jNetStream will not be able to read the .au file structure.

Sorry.

Hai Mark,

Thank you for your quick reply.

Regards,
Gomathi.K