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Padding PRR fix

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This commit is contained in:
Frank Denis 2019-12-24 14:19:35 +01:00
parent aaf0d50726
commit a9397bc33e
1 changed files with 3 additions and 3 deletions
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6
src/libdoh/src/dns.rs
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@ -244,9 +244,9 @@ pub fn add_edns_padding(packet: &mut Vec<u8>, block_size: usize) -> Result<(), E
};
ensure!(packet_len < DNS_MAX_PACKET_SIZE, "Large packet");
let pad_len = (block_size - 1) - ((packet_len + (block_size - 1)) & (block_size - 1));
let mut edns_padding_prr = vec![b'X'; 2 + pad_len];
edns_padding_prr[0] = (DNS_PTYPE_PADDING >> 8) as u8;
edns_padding_prr[1] = DNS_PTYPE_PADDING as u8;
let mut edns_padding_prr = vec![b'X'; 4 + pad_len];
BigEndian::write_u16(&mut edns_padding_prr[0..], DNS_PTYPE_PADDING);
BigEndian::write_u16(&mut edns_padding_prr[2..], pad_len as u16);
let edns_padding_prr_len = edns_padding_prr.len();
let edns_rdlen_offset: usize = edns_offset + 8;
ensure!(packet_len - edns_rdlen_offset >= 2, "Short packet");