feat: added modified TCP packet parser

checksum generation code is different, to allow for
some sneaky tricks with regards to identifying the sparse
session but binding to the same port multiple times

tcp-test/client/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2021"
 
 [dependencies]
 pcap-sys = { path = "../../pcap-sys" }
+packets = { path = "../../packets" }
 nl-sys = { path = "../../nl-sys" }
 rand = "0.8.5"
 tokio = { version = "1.32.0", features = ["full"] }

tcp-test/client/src/main.rs

@@ -3,6 +3,11 @@ use std::net::Ipv4Addr;
 use anyhow::anyhow;
 
 use nl_sys::{netlink, route};
+use packets::EthernetPacket;
+
+struct TcpConnection {
+    packets_to_ack: Vec<EthernetPacket>,
+}
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
@@ -27,7 +32,7 @@ async fn main() -> anyhow::Result<()> {
         (ifname, srcip, srcmac, dstmac)
     };
 
-    let mut interface = pcap_sys::new_aggregate_interface(false)?;
+    let mut interface = pcap_sys::Interface::<pcap_sys::DevDisabled>::new(&ifname)?;
 
     interface.set_buffer_size(8192)?;
     interface.set_non_blocking(true)?;
@@ -36,9 +41,14 @@ async fn main() -> anyhow::Result<()> {
 
     let mut interface = interface.activate()?;
 
-    interface.set_filter("inbound and tcp port 54249", true, None)?;
+    let port: u16 = loop {
+        let port = rand::random();
+        if port > 30_000 {
+            break port;
+        }
+    };
 
-    interface.prune(|_, interface| interface.datalink() != pcap_sys::consts::DLT_EN10MB);
+    interface.set_filter(&format!("inbound and tcp port {}", port), true, None)?;
 
     Ok(())
 }