add dns field and check

1 files changed, 16 insertions, 6 deletions

diff --git a/src/sniffing/headers.rs b/src/sniffing/headers.rs
index 644a6b2..050f2d3 100644
--- a/src/sniffing/headers.rs
+++ b/src/sniffing/headers.rs
@@ -20,7 +20,8 @@ pub enum PacketInfo {
         src_port: Port,
         dst_ip: Ipv4,
         dst_port: Port,
-        protocol: Protocol
+        protocol: Protocol,
+        dns: bool
     },
     // <https://www.geeksforgeeks.org/computer-networks/internet-protocol-version-6-ipv6-header/>
     V6 {
@@ -28,7 +29,8 @@ pub enum PacketInfo {
         src_port: Port,
         dst_ip: Ipv6,
         dst_port: Port,
-        protocol: Protocol
+        protocol: Protocol,
+        dns: bool
     }
 }
 
@@ -49,17 +51,21 @@ pub fn sniff_raw_packets(packet: &[u8]) -> SniffedPacket {
     dbg!(ver);
     match ver {
         4 => {
+            let dst_port = Port::from_be_bytes([packet[22], packet[23]]);
+            let dns;
+            if dst_port == 53 { dns = true; } else { dns = false; };
             // FIXME: hardcoded IPv4 port offset
             let v4 = PacketInfo::V4{
                 src_ip: <Ipv4>::try_from(&packet[12..16])?,
                 src_port: Port::from_be_bytes([packet[20], packet[21]]),
                 dst_ip: <Ipv4>::try_from(&packet[16..20])?,
-                dst_port: Port::from_be_bytes([packet[22], packet[23]]),
+                dst_port,
                 protocol: match packet[9] {
                     6 => Protocol::TCP,
                     17 => Protocol::UDP,
                     p => Protocol::Unsupported(p)
-                }
+                },
+                dns
             };
         if !matches!(v4.protocol(), Protocol::Unsupported(_)) {
             println!("{v4:?}");
@@ -70,16 +76,20 @@ pub fn sniff_raw_packets(packet: &[u8]) -> SniffedPacket {
         },
         6 => {
     println!("im in 6!");
+            let dst_port = Port::from_be_bytes([packet[22], packet[23]]);
+            let dns;
+            if dst_port == 53 { dns = true; } else { dns = false; };
             let v6 = PacketInfo::V6{
                 src_ip: <Ipv6>::try_from(&packet[8..24])?,
                 src_port: Port::from_be_bytes([packet[40], packet[41]]),
                 dst_ip: <Ipv6>::try_from(&packet[24..40])?,
-                dst_port: Port::from_be_bytes([packet[42], packet[43]]),
+                dst_port,
                 protocol: match packet[6] {
                     6 => Protocol::TCP,
                     17 => Protocol::UDP,
                     p => Protocol::Unsupported(p)
-                }
+                },
+                dns
             };
         if !matches!(v6.protocol(), Protocol::Unsupported(_)) {
             println!("{v6:?}");