52 lines
1.4 KiB
Rust
52 lines
1.4 KiB
Rust
use bytes::{Bytes, Buf, BufMut};
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use errors::*;
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use std::io::Cursor;
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mod std_impls;
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mod write;
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pub use self::write::*;
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pub trait DnsPacketData: Sized {
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fn deserialize(data: &mut Cursor<Bytes>) -> Result<Self>;
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fn serialize(&self, context: &mut DnsPacketWriteContext, packet: &mut Vec<u8>) -> Result<()>;
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}
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pub fn deserialize_with<F, O>(data: Bytes, parser: F) -> Result<O>
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where
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F: FnOnce(&mut Cursor<Bytes>) -> Result<O>,
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{
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let mut c = Cursor::new(data);
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let result = parser(&mut c)?;
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if c.remaining() != 0 {
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bail!("data remaining: {} bytes", c.remaining())
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}
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Ok(result)
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}
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pub fn remaining_bytes(data: &mut Cursor<Bytes>) -> Bytes {
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let pos = data.position() as usize;
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let len = data.remaining();
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let result = data.get_ref().slice(pos, pos + len);
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data.advance(len);
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result
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}
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pub fn short_blob(data: &mut Cursor<Bytes>) -> Result<Bytes> {
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check_enough_data!(data, 1, "short blob length");
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let blob_len = data.get_u8() as usize;
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check_enough_data!(data, blob_len, "short blob content");
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let pos = data.position() as usize;
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let blob = data.get_ref().slice(pos, pos + blob_len);
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data.advance(blob_len);
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Ok(blob)
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}
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pub fn write_short_blob(data: &[u8], packet: &mut Vec<u8>) -> Result<()> {
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ensure!(data.len() < 256, "short blob must be at most 255 bytes long");
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packet.reserve(data.len() + 1);
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packet.put_u8(data.len() as u8);
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packet.put_slice(data);
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Ok(())
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}
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