Update README with sample invocations

Author: tuxuser

README.md

@@ -11,6 +11,73 @@ cargo test
 
 ## Usage
 
-```text
-cargo run
+### PCAP Parser
+
+To simply decrypt communication and print to terminal:
+
+```sh
+$ cargo run --bin pcap_parser -- --srtp-key <SRTP KEY BASE64> <PATH TO PCAP>
+Using SRTP key: Some("<SRTP KEY>")
+PCAP Decrypt path: None
+STUN Packet: Binding request l=76 attrs=4 id=hvRAX7bbtFhz4GZP
+STUN Packet: Binding request l=76 attrs=4 id=Q/ZCmawz/1kmzU2P
+STUN Packet: Binding request l=76 attrs=4 id=nv5JP7xN12fgbyXu
+STUN Packet: Binding request l=76 attrs=4 id=hvRAX7bbtFhz4GZP
+STUN Packet: Binding request l=76 attrs=4 id=OuJFwaMs+G7QrfBu
+STUN Packet: Binding success response l=48 attrs=3 id=OuJFwaMs+G7QrfBu
+STUN Packet: Binding request l=80 attrs=5 id=cyFG476hFBbaeza+
+STUN Packet: Binding success response l=48 attrs=3 id=cyFG476hFBbaeza+
+ConnectionProbingPacket::Syn(DataLen=1434)
+ConnectionProbingPacket::Syn(DataLen=1434)
+ConnectionProbingPacket::Syn(DataLen=1418)
+ConnectionProbingPacket::Syn(DataLen=1402)
+ConnectionProbingPacket::Syn(DataLen=1386)
+ConnectionProbingPacket::Syn(DataLen=1370)
+ConnectionProbingPacket::Syn(DataLen=1354)
+STUN Packet: Binding request l=76 attrs=4 id=nv5JP7xN12fgbyXu
+STUN Packet: Binding request l=76 attrs=4 id=hvRAX7bbtFhz4GZP
+STUN Packet: Binding success response l=48 attrs=3 id=hvRAX7bbtFhz4GZP
+STUN Packet: Binding request l=76 attrs=4 id=BXVF8Y8k7Bex1R5Y
+STUN Packet: Binding success response l=48 attrs=3 id=BXVF8Y8k7Bex1R5Y
+ConnectionProbingPacket::Syn(DataLen=1334)
+ConnectionProbingPacket::Syn(DataLen=1318)
+ConnectionProbingPacket::Syn(DataLen=1302)
+ConnectionProbingPacket::Syn(DataLen=1286)
+ConnectionProbingPacket::Syn(DataLen=1270)
+ConnectionProbingPacket::Syn(DataLen=1254)
+ConnectionProbingPacket::Syn(DataLen=1434)
+ConnectionProbingPacket::Ack(AcceptedSize=1434, Appendix=0)
+ConnectionProbingPacket::Ack(AcceptedSize=1334, Appendix=0)
+RTP: UDPKeepAlive Seq: 2, ts: 0, ssrc: 0
+|00000000 09000000 64000000 00000000| ........d....... 00000000
+|401f0000 00000000 0a000000 58020000| @...........X... 00000010
+|88130000 00000000 0000|              ..........       00000020
+...
+RTP: MuxDCTControl Seq: 5, ts: 0, ssrc: 1024
+|14c10af4 01640064 00020000 002e004d| .....d.d.......M 00000000
+|6963726f 736f6674 3a3a4261 7369783a| icrosoft::Basix: 00000010
+|3a446374 3a3a4368 616e6e65 6c3a3a43| :Dct::Channel::C 00000020
+|6c617373 3a3a436f 6e74726f 6c000000| lass::Control... 00000030
+|00020000 00020000 00|
+```
+
+To decrypt into new PCAP file
+
+```sh
+$ cargo run --bin pcap_parser -- --srtp-key <SRTP KEY BASE64> --decrypt-pcap <TARGET PLAINTEXT PCAP> <PATH TO PCAP>
+Using SRTP key: Some("<SRTP KEY>")
+PCAP Decrypt path: Some("plaintext.pcap")
+STUN Packet: Binding request l=76 attrs=4 id=hvRAX7bbtFhz4GZP
+STUN Packet: Binding request l=76 attrs=4 id=Q/ZCmawz/1kmzU2P
+STUN Packet: Binding request l=76 attrs=4 id=nv5JP7xN12fgbyXu
+STUN Packet: Binding request l=76 attrs=4 id=hvRAX7bbtFhz4GZP
+STUN Packet: Binding request l=76 attrs=4 id=OuJFwaMs+G7QrfBu
+STUN Packet: Binding success response l=48 attrs=3 id=OuJFwaMs+G7QrfBu
+STUN Packet: Binding request l=80 attrs=5 id=cyFG476hFBbaeza+
+STUN Packet: Binding success response l=48 attrs=3 id=cyFG476hFBbaeza+
+STUN Packet: Binding request l=76 attrs=4 id=nv5JP7xN12fgbyXu
+STUN Packet: Binding request l=76 attrs=4 id=hvRAX7bbtFhz4GZP
+STUN Packet: Binding success response l=48 attrs=3 id=hvRAX7bbtFhz4GZP
+STUN Packet: Binding request l=76 attrs=4 id=BXVF8Y8k7Bex1R5Y
+STUN Packet: Binding success response l=48 attrs=3 id=BXVF8Y8k7Bex1R5Y
 ```

pcap_parser/src/main.rs

@@ -203,6 +203,7 @@ fn main() {
     let opt = Opt::from_args();
 
     println!("Using SRTP key: {:?}", opt.srtp_key);
+    println!("PCAP Decrypt path: {:?}", opt.decrypt_pcap);
 
     let mut cap = Capture::from_file(opt.input_file)
         .expect("Failed to open input file");