1 files changed, 147 insertions, 0 deletions
diff --git a/src/protocol/icmp.rs b/src/protocol/icmp.rs
new file mode 100644
index 0000000..c1352d5
--- /dev/null
+++ b/src/protocol/icmp.rs
@@ -0,0 +1,147 @@
+use crate::protocol::codec::Decode;
+use nom::number;
+use nom::IResult;
+
+/******************************************************************************
+ * Struct
+ ******************************************************************************/
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum IcmpType {
+    EchoReply,
+    DestinationUnreachable,
+    SourceQuench,
+    Redirect,
+    EchoRequest,
+    RouterAdvertisement,
+    RouterSolicitation,
+    TimeExceeded,
+    ParameterProblem,
+    Timestamp,
+    TimestampReply,
+    InformationRequest,
+    InformationReply,
+    AddressMaskRequest,
+    AddressMaskReply,
+    Traceroute,
+    Other(u8),
+}
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct IcmpHeader {
+    pub icmp_type: IcmpType,
+    pub icmp_code: u8,
+    pub icmp_checksum: u16,
+    pub icmp_payload: Vec<u8>,
+}
+
+/******************************************************************************
+ * API
+ ******************************************************************************/
+
+impl From<u8> for IcmpType {
+    fn from(raw: u8) -> Self {
+        match raw {
+            0 => IcmpType::EchoReply,
+            3 => IcmpType::DestinationUnreachable,
+            4 => IcmpType::SourceQuench,
+            5 => IcmpType::Redirect,
+            8 => IcmpType::EchoRequest,
+            9 => IcmpType::RouterAdvertisement,
+            10 => IcmpType::RouterSolicitation,
+            11 => IcmpType::TimeExceeded,
+            12 => IcmpType::ParameterProblem,
+            13 => IcmpType::Timestamp,
+            14 => IcmpType::TimestampReply,
+            15 => IcmpType::InformationRequest,
+            16 => IcmpType::InformationReply,
+            17 => IcmpType::AddressMaskRequest,
+            18 => IcmpType::AddressMaskReply,
+            30 => IcmpType::Traceroute,
+            other => IcmpType::Other(other),
+        }
+    }
+}
+
+impl Decode for IcmpHeader {
+    type Iterm = IcmpHeader;
+    fn decode(input: &[u8]) -> IResult<&[u8], IcmpHeader> {
+        let (input, icmp_type) = number::streaming::be_u8(input)?;
+        let (input, icmp_code) = number::streaming::be_u8(input)?;
+        let (input, icmp_checksum) = number::streaming::be_u16(input)?;
+        let (input, icmp_payload) = nom::bytes::streaming::take(4u8)(input)?;
+
+        Ok((
+            input,
+            IcmpHeader {
+                icmp_type: icmp_type.into(),
+                icmp_code,
+                icmp_checksum,
+                icmp_payload: icmp_payload.to_vec(),
+            },
+        ))
+    }
+}
+
+/******************************************************************************
+ * TEST
+ ******************************************************************************/
+
+#[cfg(test)]
+mod tests {
+    use super::IcmpHeader;
+    use crate::protocol::{codec::Decode, icmp::IcmpType};
+    const LAST_SLICE: &'static [u8] = &[
+        0x96, 0xb5, 0xe9, 0x5e, 0x00, 0x00, 0x00, 0x00, 0xac, 0xe6, 0x02, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d,
+        0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
+        0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+    ];
+
+    #[test]
+    fn icmp_header_decode() {
+        /*
+         * Internet Control Message Protocol
+         *     Type: 8 (Echo (ping) request)
+         *     Code: 0
+         *     Checksum: 0xab05 [correct]
+         *     [Checksum Status: Good]
+         *     Identifier (BE): 24363 (0x5f2b)
+         *     Identifier (LE): 11103 (0x2b5f)
+         *     Sequence Number (BE): 1 (0x0001)
+         *     Sequence Number (LE): 256 (0x0100)
+         *     [Response frame: 2]
+         *     Timestamp from icmp data: Jun 17, 2020 14:17:58.000000000 CST
+         *     [Timestamp from icmp data (relative): 0.055548000 seconds]
+         *     Data (48 bytes)
+         *         Data: ace6020000000000101112131415161718191a1b1c1d1e1f202122232425262728292a2b…
+         *         [Length: 48]
+         */
+        let bytes = [
+            0x08, 0x00, 0xab, 0x05, 0x5f, 0x2b, 0x00, 0x01, /* Payload */
+            0x96, 0xb5, 0xe9, 0x5e, 0x00, 0x00, 0x00, 0x00, 0xac, 0xe6, 0x02, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b,
+            0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29,
+            0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+        ];
+
+        let expectation = IcmpHeader {
+            icmp_type: IcmpType::EchoRequest,
+            icmp_code: 0,
+            icmp_checksum: 0xab05,
+            icmp_payload: vec![0x5f, 0x2b, 0x00, 0x01],
+        };
+
+        assert_eq!(IcmpHeader::decode(&bytes), Ok((LAST_SLICE, expectation)));
+
+        // example
+        let vlan = IcmpHeader::decode(&bytes);
+        if let Ok((payload, header)) = vlan {
+            println!("return: {:?}, payload: {}", header, payload.len());
+        } else {
+            println!("return: Incomplete data");
+        }
+
+        // assert_eq!(1, 0);
+    }
+}