Modified to receive SEQ and ACK numbers as command-line parameters

src/args.rs

@@ -10,6 +10,8 @@ pub struct Arguments {
     pub interface: String,
     pub src: SocketAddrV4,
     pub dst: SocketAddrV4,
+    pub seq: u32,
+    pub ack: u32,
     pub reset: bool,
     pub send_null: bool,
     pub quiet: u8,
@@ -35,6 +37,14 @@ shijack credited cyclozine for inspiration."#)
                 .required(true)
                 .help("The destination of the connection")
             )
+            .arg(Arg::with_name("seq")
+                .required(true)
+                .help("Initial seq number")
+            )
+            .arg(Arg::with_name("ack")
+                .required(true)
+                .help("Initial ack number")
+            )
             .arg(Arg::with_name("reset")
                 .short("r")
                 .long("reset")
@@ -56,6 +66,8 @@ shijack credited cyclozine for inspiration."#)
         let interface = matches.value_of("interface").unwrap();
         let src = matches.value_of("src").unwrap();
         let dst = matches.value_of("dst").unwrap();
+        let seq = matches.value_of("seq").unwrap().parse::<u32>().unwrap();
+        let ack = matches.value_of("ack").unwrap().parse::<u32>().unwrap();
         let reset = matches.occurrences_of("reset") > 0;
         let send_null = matches.occurrences_of("send-null") > 0;
         let quiet = matches.occurrences_of("quiet") as u8;
@@ -67,6 +79,8 @@ shijack credited cyclozine for inspiration."#)
             interface: interface.into(),
             src,
             dst,
+            seq,
+            ack,
             reset,
             send_null,
             quiet,

src/main.rs

@@ -30,6 +30,7 @@ use std::thread;
 use args::Arguments;
 use net::TcpFlags;
 
+use std::net::SocketAddrV4;
 
 fn run() -> Result<()> {
     let arguments = Arguments::parse().chain_err(|| "failed to parse arguments")?;
@@ -45,7 +46,12 @@ fn run() -> Result<()> {
     eprintln!("Waiting for SEQ/ACK to arrive from the srcip to the dstip.");
     eprintln!("(To speed things up, try making some traffic between the two, /msg person asdf)");
 
-    let mut connection = net::getseqack(&arguments.interface, &arguments.src, &arguments.dst)?;
+    let mut connection = net::Connection::new(
+        SocketAddrV4::new(*arguments.src.ip(), arguments.src.port()),
+        SocketAddrV4::new(*arguments.dst.ip(), arguments.dst.port()),
+        arguments.seq,
+        arguments.ack,
+    );
     eprintln!("[+] Got packet! SEQ = 0x{:x}, ACK = 0x{:x}", connection.get_seq(), connection.get_ack());
 
     let (mut tx, _rx) = net::create_socket()?;