Stefan Bühler
4 years ago
commit
63cd9196f9
31 changed files with 3303 additions and 0 deletions
@ -0,0 +1,2 @@ |
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/target/ |
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**/*.rs.bk |
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@ -0,0 +1,217 @@ |
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[[package]] |
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name = "backtrace" |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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dependencies = [ |
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"cfg-if 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)", |
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"dbghelp-sys 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)", |
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"kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)", |
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"libc 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)", |
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"winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)", |
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] |
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|
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[[package]] |
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name = "backtrace-sys" |
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version = "0.1.14" |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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dependencies = [ |
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"cc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)", |
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"libc 0.2.31 (registry+https://github.com/rust-lang/crates.io-index)", |
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] |
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|
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[[package]] |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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|
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[[package]] |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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[[package]] |
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[[package]] |
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[[package]] |
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[[package]] |
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version = "0.1.0" |
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dependencies = [ |
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"dnsbox-base 0.1.0", |
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] |
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[[package]] |
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[[package]] |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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[[package]] |
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[[package]] |
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|
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[[package]] |
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[[package]] |
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[[package]] |
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[[package]] |
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[[package]] |
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[[package]] |
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[[package]] |
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[[package]] |
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source = "registry+https://github.com/rust-lang/crates.io-index" |
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[metadata] |
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@ -0,0 +1,9 @@ |
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[package] |
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name = "dnsbox" |
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version = "0.1.0" |
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authors = ["Stefan Bühler <stbuehler@web.de>"] |
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|
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[dependencies] |
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dnsbox-base = { path = "lib/dnsbox-base" } |
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|
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[workspace] |
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@ -0,0 +1,13 @@ |
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[package] |
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name = "dnsbox-base" |
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version = "0.1.0" |
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authors = ["Stefan Bühler <stbuehler@web.de>"] |
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|
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[dependencies] |
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byteorder = "1.1.0" |
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bytes = "0.4" |
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dnsbox-derive = { path = "../dnsbox-derive" } |
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failure = "0.1.1" |
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lazy_static = "1.0.0" |
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log = "0.3" |
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smallvec = "0.4.4" |
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@ -0,0 +1,90 @@ |
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use bytes::{Bytes, Buf}; |
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use std::io::Cursor; |
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|
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use ser::DnsPacketData; |
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use errors::*; |
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|
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#[derive(Clone, Debug)] |
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pub struct HexShortBlob(Bytes); |
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|
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// Similar to `ShortText`, but uses (unquoted, no spaces allowed) hex
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// for text representation; "-" when empty
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impl DnsPacketData for HexShortBlob { |
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fn deserialize(data: &mut Cursor<Bytes>) -> Result<Self> { |
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check_enough_data!(data, 1, "HexShortBlob length"); |
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let label_len = data.get_u8() as usize; |
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check_enough_data!(data, label_len, "HexShortBlob content"); |
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let pos = data.position() as usize; |
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let text = data.get_ref().slice(pos, pos + label_len); |
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data.advance(label_len); |
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Ok(HexShortBlob(text)) |
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} |
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} |
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|
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#[derive(Clone, Debug)] |
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pub struct Base32ShortBlob(Bytes); |
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|
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// Similar to `ShortText`, but uses (unquoted, no spaces allowed) base32
|
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// for text representation; "-" when empty
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impl DnsPacketData for Base32ShortBlob { |
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fn deserialize(data: &mut Cursor<Bytes>) -> Result<Self> { |
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check_enough_data!(data, 1, "Base32ShortBlob length"); |
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let label_len = data.get_u8() as usize; |
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check_enough_data!(data, label_len, "Base32ShortBlob content"); |
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let pos = data.position() as usize; |
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let text = data.get_ref().slice(pos, pos + label_len); |
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data.advance(label_len); |
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Ok(Base32ShortBlob(text)) |
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} |
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} |
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|
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#[derive(Clone, Debug)] |
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pub struct LongText(Vec<Bytes>); |
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|
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// RFC 1035 names this `One or more <character-string>`. No following
|
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// field allowed.
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impl DnsPacketData for LongText { |
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fn deserialize(data: &mut Cursor<Bytes>) -> Result<Self> { |
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let mut texts = Vec::new(); |
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loop { |
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check_enough_data!(data, 1, "LongText length"); |
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let label_len = data.get_u8() as usize; |
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check_enough_data!(data, label_len, "LongText content"); |
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let pos = data.position() as usize; |
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texts.push(data.get_ref().slice(pos, pos + label_len)); |
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data.advance(label_len); |
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if !data.has_remaining() { break; } |
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} |
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Ok(LongText(texts)) |
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} |
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} |
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|
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#[derive(Clone, Debug)] |
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pub struct RemainingText(Bytes); |
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|
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// No length byte, just all data to end of record. uses base64 encoding
|
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// for text representation
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impl DnsPacketData for RemainingText { |
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fn deserialize(data: &mut Cursor<Bytes>) -> Result<Self> { |
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let pos = data.position() as usize; |
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let len = data.remaining(); |
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let text = data.get_ref().slice(pos, pos + len); |
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data.advance(len); |
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Ok(RemainingText(text)) |
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} |
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} |
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|
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#[derive(Clone, Debug)] |
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pub struct HexRemainingBlob(Bytes); |
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|
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// No length byte, just all data to end of record. uses hex encoding for
|
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// text representation (spaces are ignored - last field in record).
|
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impl DnsPacketData for HexRemainingBlob { |
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fn deserialize(data: &mut Cursor<Bytes>) -> Result<Self> { |
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let pos = data.position() as usize; |
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let len = data.remaining(); |
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let text = data.get_ref().slice(pos, pos + len); |
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data.advance(len); |
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Ok(HexRemainingBlob(text)) |
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} |
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} |
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@ -0,0 +1,9 @@ |
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pub mod name; |
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pub mod text; |
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pub mod binary; |
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mod rr_type; |
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|
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pub use self::name::{DnsName, DnsCompressedName}; |
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pub use self::text::{ShortText}; |
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pub use self::binary::{HexShortBlob, Base32ShortBlob, LongText, RemainingText, HexRemainingBlob}; |
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pub use self::rr_type::Type; |
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@ -0,0 +1,79 @@ |
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use std::fmt; |
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use super::DnsLabelRef; |
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|
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/// Customize formatting of DNS labels
|
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///
|
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/// The default uses "." as separator and adds a trailing separator.
|
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///
|
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/// The `Debug` formatters just format as `Display` to a String and then
|
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/// format that string as `Debug`.
|
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#[derive(Clone,Copy,PartialEq,Eq,PartialOrd,Ord,Hash,Debug)] |
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pub struct DisplayLabelsOptions { |
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/// separator to insert between (escaped) labels
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pub separator: &'static str, |
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/// whether a trailing separator is added.
|
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///
|
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/// without a trailing separator the root zone is represented as
|
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/// empty string!
|
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pub trailing: bool, |
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} |
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|
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impl Default for DisplayLabelsOptions { |
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fn default() -> Self { |
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DisplayLabelsOptions{ |
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separator: ".", |
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trailing: true, |
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} |
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} |
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} |
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|
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/// Wrap anything representing a collection of labels (`DnsLabelRef`) to
|
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/// format using the given `options`.
|
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///
|
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/// As name you can pass any cloneable `(Into)Iterator` with
|
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/// `DnsLabelRef` items, e.g:
|
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///
|
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/// * `&DnsName`
|
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/// * `DnsNameIterator`
|
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#[derive(Clone)] |
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pub struct DisplayLabels<'a, I> |
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where |
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I: IntoIterator<Item=DnsLabelRef<'a>>+Clone |
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{ |
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/// Label collection to iterate over
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pub labels: I, |
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/// Options
|
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pub options: DisplayLabelsOptions, |
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} |
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|
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impl<'a, I> fmt::Debug for DisplayLabels<'a, I> |
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where |
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I: IntoIterator<Item=DnsLabelRef<'a>>+Clone |
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{ |
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fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result { |
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// just escape the display version1
|
|||
format!("{}", self).fmt(w) |
|||
} |
|||
} |
|||
|
|||
impl<'a, I> fmt::Display for DisplayLabels<'a, I> |
|||
where |
|||
I: IntoIterator<Item=DnsLabelRef<'a>>+Clone |
|||
{ |
|||
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result { |
|||
let mut i = self.labels.clone().into_iter(); |
|||
if let Some(first_label) = i.next() { |
|||
// first label
|
|||
fmt::Display::fmt(&first_label, w)?; |
|||
// remaining labels
|
|||
while let Some(label) = i.next() { |
|||
w.write_str(self.options.separator)?; |
|||
fmt::Display::fmt(&label, w)?; |
|||
} |
|||
} |
|||
if self.options.trailing { |
|||
w.write_str(self.options.separator)?; |
|||
} |
|||
Ok(()) |
|||
} |
|||
} |
|||
@ -0,0 +1,240 @@ |
|||
use bytes::Bytes; |
|||
use errors::*; |
|||
use std::fmt; |
|||
use std::cmp::Ordering; |
|||
|
|||
#[inline] |
|||
fn check_label(label: &[u8]) -> Result<()> { |
|||
if label.len() == 0 { |
|||
bail!("label must not be empty") |
|||
} |
|||
if label.len() > 63 { |
|||
bail!("label must not be longer than 63 bytes") |
|||
} |
|||
Ok(()) |
|||
} |
|||
|
|||
/// A DNS label (any binary string with `0 < length < 64`)
|
|||
#[derive(Clone)] |
|||
pub struct DnsLabel { |
|||
pub(super) label: Bytes, // 0 < len < 64
|
|||
} |
|||
|
|||
impl DnsLabel { |
|||
/// Create new label from existing storage
|
|||
///
|
|||
/// Fails when the length doesn't match the requirement `0 < length < 64`.
|
|||
pub fn new(label: Bytes) -> Result<Self> { |
|||
check_label(&label)?; |
|||
Ok(DnsLabel{label}) |
|||
} |
|||
|
|||
/// Convert to a representation without storage
|
|||
pub fn as_ref<'a>(&'a self) -> DnsLabelRef<'a> { |
|||
DnsLabelRef{label: self.label.as_ref()} |
|||
} |
|||
|
|||
/// Access as raw bytes
|
|||
pub fn as_bytes(&self) -> &Bytes { |
|||
&self.label |
|||
} |
|||
|
|||
/// Access as raw bytes
|
|||
pub fn as_raw(&self) -> &[u8] { |
|||
&self.label |
|||
} |
|||
|
|||
/// Length of label (0 < len < 64)
|
|||
pub fn len(&self) -> u8 { |
|||
self.label.len() as u8 |
|||
} |
|||
|
|||
/// compares two labels (ASCII case insensitive)
|
|||
#[inline] |
|||
pub fn compare<'a, L: Into<DnsLabelRef<'a>>>(&self, rhs: L) -> Ordering { |
|||
compare_ascii_lc(self.as_raw(), rhs.into().as_raw()) |
|||
} |
|||
} |
|||
|
|||
impl<'a> From<DnsLabelRef<'a>> for DnsLabel { |
|||
fn from(label_ref: DnsLabelRef<'a>) -> Self { |
|||
DnsLabel{ |
|||
label: Bytes::from(label_ref.label), |
|||
} |
|||
} |
|||
} |
|||
|
|||
impl PartialEq<DnsLabel> for DnsLabel { |
|||
#[inline] |
|||
fn eq(&self, rhs: &DnsLabel) -> bool { |
|||
self.as_ref().eq(&rhs.as_ref()) |
|||
} |
|||
} |
|||
|
|||
impl<'a> PartialEq<DnsLabelRef<'a>> for DnsLabel { |
|||
#[inline] |
|||
fn eq(&self, rhs: &DnsLabelRef<'a>) -> bool { |
|||
self.as_ref().eq(rhs) |
|||
} |
|||
} |
|||
|
|||
impl Eq for DnsLabel{} |
|||
|
|||
impl PartialOrd<DnsLabel> for DnsLabel { |
|||
#[inline] |
|||
fn partial_cmp(&self, rhs: &DnsLabel) -> Option<Ordering> { |
|||
Some(self.compare(rhs)) |
|||
} |
|||
} |
|||
|
|||
impl<'a> PartialOrd<DnsLabelRef<'a>> for DnsLabel { |
|||
#[inline] |
|||
fn partial_cmp(&self, rhs: &DnsLabelRef<'a>) -> Option<Ordering> { |
|||
Some(self.compare(*rhs)) |
|||
} |
|||
} |
|||
|
|||
impl Ord for DnsLabel { |
|||
#[inline] |
|||
fn cmp(&self, rhs: &Self) -> Ordering { |
|||
self.compare(rhs) |
|||
} |
|||
} |
|||
|
|||
impl fmt::Debug for DnsLabel { |
|||
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result { |
|||
self.as_ref().fmt(w) |
|||
} |
|||
} |
|||
|
|||
impl fmt::Display for DnsLabel { |
|||
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result { |
|||
self.as_ref().fmt(w) |
|||
} |
|||
} |
|||
|
|||
/// A DNS label (any binary string with `0 < length < 64`)
|
|||
///
|
|||
/// Storage is provided through lifetime.
|
|||
#[derive(Clone,Copy)] |
|||
pub struct DnsLabelRef<'a> { |
|||
pub(super) label: &'a [u8], // 0 < len < 64
|
|||
} |
|||
|
|||
impl<'a> DnsLabelRef<'a> { |
|||
/// Create new label from existing storage
|
|||
///
|
|||
/// Fails when the length doesn't match the requirement `0 < length < 64`.
|
|||
pub fn new(label: &'a [u8]) -> Result<Self> { |
|||
check_label(label)?; |
|||
Ok(DnsLabelRef{label}) |
|||
} |
|||
|
|||
/// Access as raw bytes
|
|||
pub fn as_raw(&self) -> &'a [u8] { |
|||
self.label |
|||
} |
|||
|
|||
/// Length of label (0 < len < 64)
|
|||
pub fn len(&self) -> u8 { |
|||
self.label.len() as u8 |
|||
} |
|||
|
|||
/// compares two labels (ASCII case insensitive)
|
|||
#[inline] |
|||
pub fn compare<'b, L: Into<DnsLabelRef<'b>>>(&self, rhs: L) -> Ordering { |
|||
compare_ascii_lc(self.as_raw(), rhs.into().as_raw()) |
|||
} |
|||
} |
|||
|
|||
fn compare_ascii_lc(lhs: &[u8], rhs: &[u8]) -> Ordering { |
|||
use std::ascii::AsciiExt; |
|||
use std::cmp::min; |
|||
let l = min(lhs.len(), rhs.len()); |
|||
for i in 0..l { |
|||
let a : u8 = AsciiExt::to_ascii_lowercase(&lhs[i]); |
|||
let b : u8 = AsciiExt::to_ascii_lowercase(&rhs[i]); |
|||
match Ord::cmp(&a, &b) { |
|||
Ordering::Equal => continue, |
|||
c => return c, |
|||
} |
|||
} |
|||
Ord::cmp(&lhs.len(), &rhs.len()) |
|||
} |
|||
|
|||
impl<'a> From<&'a DnsLabel> for DnsLabelRef<'a> { |
|||
fn from(label: &'a DnsLabel) -> Self { |
|||
label.as_ref() |
|||
} |
|||
} |
|||
|
|||
impl<'a, 'b> PartialEq<DnsLabelRef<'a>> for DnsLabelRef<'b> { |
|||
fn eq(&self, rhs: &DnsLabelRef<'a>) -> bool { |
|||
use std::ascii::AsciiExt; |
|||
AsciiExt::eq_ignore_ascii_case(self.as_raw(), rhs.as_raw()) |
|||
} |
|||
} |
|||
|
|||
impl<'a> PartialEq<DnsLabel> for DnsLabelRef<'a> { |
|||
#[inline] |
|||
fn eq(&self, rhs: &DnsLabel) -> bool { |
|||
self.eq(&rhs.as_ref()) |
|||
} |
|||
} |
|||
|
|||
impl<'a> Eq for DnsLabelRef<'a>{} |
|||
|
|||
impl<'a, 'b> PartialOrd<DnsLabelRef<'a>> for DnsLabelRef<'b> { |
|||
#[inline] |
|||
fn partial_cmp(&self, rhs: &DnsLabelRef<'a>) -> Option<Ordering> { |
|||
Some(self.compare(*rhs)) |
|||
} |
|||
} |
|||
|
|||
impl<'a> PartialOrd<DnsLabel> for DnsLabelRef<'a> { |
|||
#[inline] |
|||
fn partial_cmp(&self, rhs: &DnsLabel) -> Option<Ordering> { |
|||
Some(self.compare(rhs)) |
|||
} |
|||
} |
|||
|
|||
impl<'a> Ord for DnsLabelRef<'a> { |
|||
#[inline] |
|||
fn cmp(&self, rhs: &Self) -> Ordering { |
|||
self.compare(*rhs) |
|||
} |
|||
} |
|||
|
|||
impl<'a> fmt::Debug for DnsLabelRef<'a> { |
|||
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result { |
|||
// just escape the display version
|
|||
format!("{}", self).fmt(w) |
|||
} |
|||
} |
|||
|
|||
impl<'a> fmt::Display for DnsLabelRef<'a> { |
|||
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result { |
|||
use std::str; |
|||
let mut done = 0; |
|||
for pos in 0..self.label.len() { |
|||
let c = self.label[pos]; |
|||
if c <= 0x21 || c >= 0x7e || b'.' == c || b'\\' == c { |
|||
// flush
|
|||
if done < pos { |
|||
w.write_str(unsafe {str::from_utf8_unchecked(&self.label[done..pos])})?; |
|||
} |
|||
match c { |
|||
b'.' => w.write_str(r#"\."#)?, |
|||
b'\\' => w.write_str(r#"\\"#)?, |
|||
_ => write!(w, r"\{:03o}", c)?, |
|||
} |
|||
done = pos + 1; |
|||
} |
|||
} |
|||
// final flush
|
|||
if done < self.label.len() { |
|||
w.write_str(unsafe {str::from_utf8_unchecked(&self.label[done..])})?; |
|||
} |
|||
Ok(()) |
|||
} |
|||
} |
|||
@ -0,0 +1,509 @@ |
|||
#![deny(missing_docs)] |
|||
//! Various structs to represents DNS names and labels
|
|||
|
|||
use bytes::Bytes; |
|||
use errors::*; |
|||
use ser::DnsPacketData; |
|||
use smallvec::SmallVec; |
|||
use std::fmt; |
|||
use std::io::Cursor; |
|||
use std::ops::{Deref, DerefMut}; |
|||
|
|||
pub use self::display::*; |
|||
pub use self::label::*; |
|||
|
|||
mod display; |
|||
mod label; |
|||
mod name_mutations; |
|||
mod name_parser; |
|||
|
|||
#[derive(Clone,Copy,PartialEq,Eq,PartialOrd,Ord,Hash,Debug)] |
|||
enum LabelOffset { |
|||
LabelStart(u8), |
|||
PacketStart(u8), |
|||
} |
|||
|
|||
// the heap meta data is usually at least 2*usize big; assuming 64-bit
|
|||
// platforms it should be ok to use 16 bytes in the smallvec.
|
|||
#[derive(Clone,PartialEq,Eq,PartialOrd,Ord,Hash,Debug)] |
|||
enum LabelOffsets { |
|||
Uncompressed(SmallVec<[u8;16]>), |
|||
Compressed(usize, SmallVec<[LabelOffset;8]>), |
|||
} |
|||
|
|||
impl LabelOffsets { |
|||
fn len(&self) -> u8 { |
|||
let l = match *self { |
|||
LabelOffsets::Uncompressed(ref offs) => offs.len(), |
|||
LabelOffsets::Compressed(_, ref offs) => offs.len(), |
|||
}; |
|||
debug_assert!(l < 128); |
|||
l as u8 |
|||
} |
|||
|
|||
fn label_pos(&self, ndx: u8) -> usize { |
|||
debug_assert!(ndx < 127); |
|||
match *self { |
|||
LabelOffsets::Uncompressed(ref offs) => offs[ndx as usize] as usize, |
|||
LabelOffsets::Compressed(start, ref offs) => match offs[ndx as usize] { |
|||
LabelOffset::LabelStart(o) => start + (o as usize), |
|||
LabelOffset::PacketStart(o) => o as usize, |
|||
} |
|||
} |
|||
} |
|||
|
|||
fn is_compressed(&self) -> bool { |
|||
match *self { |
|||
LabelOffsets::Uncompressed(_) => false, |
|||
LabelOffsets::Compressed(_, _) => true, |
|||
} |
|||
} |
|||
} |
|||
|
|||
/// A DNS name
|
|||
///
|
|||
/// Uses the "original" raw representation for storage (i.e. can share
|
|||
/// memory with a parsed packet)
|
|||
#[derive(Clone,Hash)] |
|||
pub struct DnsName { |
|||
// in uncompressed form always includes terminating null octect;
|
|||
// but even in uncompressed form can include unused bytes at the
|
|||
// beginning
|
|||
//
|
|||
// may be empty for the root name (".", no labels)
|
|||
data: Bytes, |
|||
// either uncompressed or compressed offsets
|
|||
label_offsets: LabelOffsets, |
|||
// length of encoded form
|
|||
total_len: u8, |
|||
} |
|||
|
|||
impl DnsName { |
|||
/// Create new name representing the DNS root (".")
|
|||
pub fn new_root() -> Self { |
|||
DnsName{ |
|||
data: Bytes::new(), |
|||
label_offsets: LabelOffsets::Uncompressed(SmallVec::new()), |
|||
total_len: 1, |
|||
} |
|||
} |
|||
|
|||
/// Create new name representing the DNS root (".") and pre-allocate
|
|||
/// storage
|
|||
pub fn with_capacity(labels: u8, total_len: u8) -> Self { |
|||
DnsName{ |
|||
data: Bytes::with_capacity(total_len as usize), |
|||
label_offsets: LabelOffsets::Uncompressed(SmallVec::with_capacity(labels as usize)), |
|||
total_len: 1, |
|||
} |
|||
} |
|||
|
|||
/// Returns whether name represents the DNS root (".")
|
|||
pub fn is_root(&self) -> bool { |
|||
0 == self.label_count() |
|||
} |
|||
|
|||
/// How many labels the name has (without the trailing empty label,
|
|||
/// at most 127)
|
|||
pub fn label_count(&self) -> u8 { |
|||
self.label_offsets.len() |
|||
} |
|||
|
|||
/// Iterator over the labels (in the order they are stored in memory,
|
|||
/// i.e. top-level name last).
|
|||
pub fn labels<'a>(&'a self) -> DnsNameIterator<'a> { |
|||
DnsNameIterator{ |
|||
name: &self, |
|||
front_label: 0, |
|||
back_label: self.label_offsets.len(), |
|||
} |
|||
} |
|||
|
|||
/// Return label at index `ndx`
|
|||
///
|
|||
/// # Panics
|
|||
///
|
|||
/// panics if `ndx >= self.label_count()`.
|
|||
pub fn label_ref<'a>(&'a self, ndx: u8) -> DnsLabelRef<'a> { |
|||
let pos = self.label_offsets.label_pos(ndx); |
|||
let label_len = self.data[pos]; |
|||
debug_assert!(label_len < 64); |
|||
let end = pos + 1 + label_len as usize; |
|||
DnsLabelRef{label: &self.data[pos + 1..end]} |
|||
} |
|||
|
|||
/// Return label at index `ndx`
|
|||
///
|
|||
/// # Panics
|
|||
///
|
|||
/// panics if `ndx >= self.label_count()`.
|
|||
pub fn label(&self, ndx: u8) -> DnsLabel { |
|||
let pos = self.label_offsets.label_pos(ndx); |
|||
let label_len = self.data[pos]; |
|||
debug_assert!(label_len < 64); |
|||
let end = pos + 1 + label_len as usize; |
|||
DnsLabel{label: self.data.slice(pos + 1, end) } |
|||
} |
|||
} |
|||
|
|||
impl<'a> IntoIterator for &'a DnsName { |
|||
type Item = DnsLabelRef<'a>; |
|||
type IntoIter = DnsNameIterator<'a>; |
|||
|
|||
fn into_iter(self) -> Self::IntoIter { |
|||
self.labels() |
|||
} |
|||
} |
|||
|
|||
impl PartialEq<DnsName> for DnsName { |
|||
fn eq(&self, rhs: &DnsName) -> bool { |
|||
let a_labels = self.labels(); |
|||
let b_labels = rhs.labels(); |
|||
if a_labels.len() != b_labels.len() { return false; } |
|||
a_labels.zip(b_labels).all(|(a,b)| a == b) |
|||
} |
|||
} |
|||
|
|||
impl Eq for DnsName{} |
|||
|
|||
impl fmt::Debug for DnsName { |
|||
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result { |
|||
DisplayLabels{ |
|||
labels: self, |
|||
options: Default::default(), |
|||
}.fmt(w) |
|||
} |
|||
} |
|||
|
|||
impl fmt::Display for DnsName { |
|||
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result { |
|||
DisplayLabels{ |
|||
labels: self, |
|||
options: Default::default(), |
|||
}.fmt(w) |
|||
} |
|||
} |
|||
|
|||
impl DnsPacketData for DnsName { |
|||
fn deserialize(data: &mut Cursor<Bytes>) -> Result<Self> { |
|||
DnsName::parse_name(data, false) |
|||
} |
|||
} |
|||
|
|||
/// Similar to `DnsName`, but allows using compressed labels in the
|
|||
/// serialized form
|
|||
#[derive(Clone)] |
|||
pub struct DnsCompressedName(pub DnsName); |
|||
|
|||
impl Deref for DnsCompressedName { |
|||
type Target = DnsName; |
|||
|
|||
fn deref(&self) -> &Self::Target { |
|||
&self.0 |
|||
} |
|||
} |
|||
|
|||
impl DerefMut for DnsCompressedName { |
|||
fn deref_mut(&mut self) -> &mut Self::Target { |
|||
&mut self.0 |
|||
} |
|||
} |
|||
|
|||
impl<'a> IntoIterator for &'a DnsCompressedName { |
|||
type Item = DnsLabelRef<'a>; |
|||
type IntoIter = DnsNameIterator<'a>; |
|||
|
|||
fn into_iter(self) -> Self::IntoIter { |
|||
self.labels() |
|||
} |
|||
} |
|||
|
|||
impl PartialEq<DnsCompressedName> for DnsCompressedName { |
|||
fn eq(&self, rhs: &DnsCompressedName) -> bool { |
|||
self.0 == rhs.0 |
|||
} |
|||
} |
|||
|
|||
impl PartialEq<DnsName> for DnsCompressedName { |
|||
fn eq(&self, rhs: &DnsName) -> bool { |
|||
&self.0 == rhs |
|||
} |
|||
} |
|||
|
|||
impl PartialEq<DnsCompressedName> for DnsName { |
|||
fn eq(&self, rhs: &DnsCompressedName) -> bool { |
|||
self == &rhs.0 |
|||
} |
|||
} |
|||
|
|||
impl Eq for DnsCompressedName{} |
|||
|
|||
impl fmt::Debug for DnsCompressedName { |
|||
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result { |
|||
self.0.fmt(w) |
|||
} |
|||
} |
|||
|
|||
impl fmt::Display for DnsCompressedName { |
|||
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result { |
|||
self.0.fmt(w) |
|||
} |
|||
} |
|||
|
|||
impl DnsPacketData for DnsCompressedName { |
|||
fn deserialize(data: &mut Cursor<Bytes>) -> Result<Self> { |
|||
Ok(DnsCompressedName(DnsName::parse_name(data, true)?)) |
|||
} |
|||
} |
|||
|
|||
/// Iterator type for [`DnsName::labels`]
|
|||
///
|
|||
/// [`DnsName::labels`]: struct.DnsName.html#method.labels
|
|||
#[derive(Clone)] |
|||
pub struct DnsNameIterator<'a> { |
|||
name: &'a DnsName, |
|||
front_label: u8, |
|||
back_label: u8, |
|||
} |
|||
|
|||
impl<'a> Iterator for DnsNameIterator<'a> { |
|||
type Item = DnsLabelRef<'a>; |
|||
|
|||
fn next(&mut self) -> Option<Self::Item> { |
|||
if self.front_label >= self.back_label { return None } |
|||
let label = self.name.label_ref(self.front_label); |
|||
self.front_label += 1; |
|||
Some(label) |
|||
} |
|||
|
|||
fn size_hint(&self) -> (usize, Option<usize>) { |
|||
let count = self.len(); |
|||
(count, Some(count)) |
|||
} |
|||
|
|||
fn count(self) -> usize { |
|||
self.len() |
|||
} |
|||
} |
|||
|
|||
impl<'a> ExactSizeIterator for DnsNameIterator<'a> { |
|||
fn len(&self) -> usize { |
|||
(self.back_label - self.front_label) as usize |
|||
} |
|||
} |
|||
|
|||
impl<'a> DoubleEndedIterator for DnsNameIterator<'a> { |
|||
fn next_back(&mut self) -> Option<Self::Item> { |
|||
if self.front_label >= self.back_label { return None } |
|||
self.back_label -= 1; |
|||
let label = self.name.label_ref(self.back_label); |
|||
Some(label) |
|||
} |
|||
} |
|||
|
|||
#[cfg(test)] |
|||
mod tests { |
|||
use ser::packet; |
|||
use super::*; |
|||
|
|||
/* |
|||
fn deserialize(bytes: &'static [u8]) -> Result<DnsName> { |
|||
let result = packet::deserialize::<DnsName>(Bytes::from_static(bytes))?; |
|||
{ |
|||
let check_result = packet::deserialize::<DnsName>(result.clone().encode()).unwrap(); |
|||
assert_eq!(check_result, result); |
|||
} |
|||
Ok(result) |
|||
} |
|||
*/ |
|||
|
|||
fn de_uncompressed(bytes: &'static [u8]) -> Result<DnsName> { |
|||
let result = packet::deserialize::<DnsName>(Bytes::from_static(bytes))?; |
|||
assert_eq!(bytes, result.clone().encode()); |
|||
Ok(result) |
|||
} |
|||
|
|||
fn check_uncompressed_display(bytes: &'static [u8], txt: &str, label_count: u8) { |
|||
let name = de_uncompressed(bytes).unwrap(); |
|||
assert_eq!( |
|||
name.labels().count(), |
|||
label_count as usize |
|||
); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
txt |
|||
); |
|||
} |
|||
|
|||
fn check_uncompressed_debug(bytes: &'static [u8], txt: &str) { |
|||
let name = de_uncompressed(bytes).unwrap(); |
|||
assert_eq!( |
|||
format!("{:?}", name), |
|||
txt |
|||
); |
|||
} |
|||
|
|||
#[test] |
|||
fn parse_and_display_name() { |
|||
check_uncompressed_display( |
|||
b"\x07example\x03com\x00", |
|||
"example.com.", |
|||
2, |
|||
); |
|||
check_uncompressed_display( |
|||
b"\x07e!am.l\\\x03com\x00", |
|||
"e\\041am\\.l\\\\.com.", |
|||
2, |
|||
); |
|||
check_uncompressed_debug( |
|||
b"\x07e!am.l\\\x03com\x00", |
|||
r#""e\\041am\\.l\\\\.com.""#, |
|||
); |
|||
} |
|||
|
|||
#[test] |
|||
fn parse_and_reverse_name() { |
|||
let name = de_uncompressed(b"\x03www\x07example\x03com\x00").unwrap(); |
|||
assert_eq!( |
|||
format!( |
|||
"{}", |
|||
DisplayLabels{ |
|||
labels: name.labels().rev(), |
|||
options: DisplayLabelsOptions{ |
|||
separator: " ", |
|||
trailing: false, |
|||
}, |
|||
} |
|||
), |
|||
"com example www" |
|||
); |
|||
} |
|||
|
|||
#[test] |
|||
fn modifications() { |
|||
let mut name = de_uncompressed(b"\x07example\x03com\x00").unwrap(); |
|||
|
|||
name.push_front(DnsLabelRef::new(b"www").unwrap()).unwrap(); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
"www.example.com." |
|||
); |
|||
|
|||
name.push_back(DnsLabelRef::new(b"org").unwrap()).unwrap(); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
"www.example.com.org." |
|||
); |
|||
|
|||
name.pop_front(); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
"example.com.org." |
|||
); |
|||
|
|||
name.push_front(DnsLabelRef::new(b"mx").unwrap()).unwrap(); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
"mx.example.com.org." |
|||
); |
|||
// the "mx" label should fit into the place "www" used before,
|
|||
// make sure the buffer was reused and the name not moved within
|
|||
assert_eq!(1, name.label_offsets.label_pos(0)); |
|||
|
|||
name.push_back(DnsLabelRef::new(b"com").unwrap()).unwrap(); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
"mx.example.com.org.com." |
|||
); |
|||
} |
|||
|
|||
|
|||
|
|||
fn de_compressed(bytes: &'static [u8], offset: usize) -> Result<DnsCompressedName> { |
|||
use bytes::Buf; |
|||
|
|||
let mut c = Cursor::new(Bytes::from_static(bytes)); |
|||
c.set_position(offset as u64); |
|||
let result = DnsPacketData::deserialize(&mut c)?; |
|||
if c.remaining() != 0 { |
|||
bail!("data remaining: {}", c.remaining()) |
|||
} |
|||
Ok(result) |
|||
} |
|||
|
|||
fn check_compressed_display(bytes: &'static [u8], offset: usize, txt: &str, label_count: u8) { |
|||
let name = de_compressed(bytes, offset).unwrap(); |
|||
assert_eq!( |
|||
name.labels().count(), |
|||
label_count as usize |
|||
); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
txt |
|||
); |
|||
} |
|||
|
|||
fn check_compressed_debug(bytes: &'static [u8], offset: usize, txt: &str) { |
|||
let name = de_compressed(bytes, offset).unwrap(); |
|||
assert_eq!( |
|||
format!("{:?}", name), |
|||
txt |
|||
); |
|||
} |
|||
|
|||
#[test] |
|||
fn parse_and_display_compressed_name() { |
|||
check_compressed_display( |
|||
b"\x03com\x00\x07example\xc0", 5, |
|||
"example.com.", |
|||
2, |
|||
); |
|||
check_compressed_display( |
|||
b"\x03com\x00\x07e!am.l\\\xc0", 5, |
|||
"e\\041am\\.l\\\\.com.", |
|||
2, |
|||
); |
|||
check_compressed_debug( |
|||
b"\x03com\x00\x07e!am.l\\\xc0", 5, |
|||
r#""e\\041am\\.l\\\\.com.""#, |
|||
); |
|||
} |
|||
|
|||
#[test] |
|||
fn modifications_compressed() { |
|||
let mut name = de_compressed(b"\x03com\x00\x07example\xc0", 5).unwrap(); |
|||
|
|||
name.push_front(DnsLabelRef::new(b"www").unwrap()).unwrap(); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
"www.example.com." |
|||
); |
|||
|
|||
name.push_back(DnsLabelRef::new(b"org").unwrap()).unwrap(); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
"www.example.com.org." |
|||
); |
|||
|
|||
name.pop_front(); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
"example.com.org." |
|||
); |
|||
|
|||
name.push_front(DnsLabelRef::new(b"mx").unwrap()).unwrap(); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
"mx.example.com.org." |
|||
); |
|||
// the "mx" label should fit into the place "www" used before,
|
|||
// make sure the buffer was reused and the name not moved within
|
|||
assert_eq!(1, name.label_offsets.label_pos(0)); |
|||
|
|||
name.push_back(DnsLabelRef::new(b"com").unwrap()).unwrap(); |
|||
assert_eq!( |
|||
format!("{}", name), |
|||
"mx.example.com.org.com." |
|||
); |
|||
} |
|||
} |
|||
@ -0,0 +1,265 @@ |
|||
use bytes::{BytesMut,BufMut}; |
|||
use super::*; |
|||
|
|||
impl DnsName { |
|||
/// Remove the front label
|
|||
///
|
|||
/// Returns `false` if the name was the root (".")
|
|||
pub fn try_pop_front(&mut self) -> bool { |
|||
match self.label_offsets { |
|||
LabelOffsets::Uncompressed(ref mut offs) => { |
|||
if offs.is_empty() { return false; } |
|||
self.total_len -= self.data[offs[0] as usize] + 1; |
|||
offs.remove(0); |
|||
}, |
|||
LabelOffsets::Compressed(ref mut start_pos, ref mut offs) => { |
|||
if offs.is_empty() { return false; } |
|||
match offs[0] { |
|||
LabelOffset::LabelStart(o) => { |
|||
let label_space = self.data[*start_pos + o as usize] + 1; |
|||
self.total_len -= label_space; |
|||
*start_pos += label_space as usize; |
|||
}, |
|||
LabelOffset::PacketStart(o) => { |
|||
self.total_len -= self.data[o as usize] + 1; |
|||
}, |
|||
} |
|||
offs.remove(0); |
|||
}, |
|||
} |
|||
true |
|||
} |
|||
|
|||
/// Remove the front label
|
|||
///
|
|||
/// # Panics
|
|||
///
|
|||
/// Panics if the name was the root (".")
|
|||
pub fn pop_front(&mut self) { |
|||
if !self.try_pop_front() { panic!("Cannot pop label from root name") } |
|||
} |
|||
|
|||
/// Insert a new label at the front
|
|||
///
|
|||
/// Returns an error if the resulting name would be too long
|
|||
pub fn push_front<'a, L: Into<DnsLabelRef<'a>>>(&mut self, label: L) -> Result<()> { |
|||
let label = label.into(); |
|||
if label.len() > 254 - self.total_len { bail!("Cannot append label, resulting name too long") } |
|||
let (mut data, start) = self.reserve(label.len() as usize + 1, 0); |
|||
|
|||
let new_label_pos = start - (label.len() + 1) as usize; |
|||
data[new_label_pos] = label.len(); |
|||
data[new_label_pos+1..new_label_pos+1+label.len() as usize].copy_from_slice(label.as_raw()); |
|||
self.data = data.freeze(); |
|||
self.total_len += label.len() + 1; |
|||
match self.label_offsets { |
|||
LabelOffsets::Uncompressed(ref mut offs) => { |
|||
offs.insert(0, new_label_pos as u8); |
|||
}, |
|||
LabelOffsets::Compressed(_, _) => unreachable!(), |
|||
} |
|||
|
|||
Ok(()) |
|||
} |
|||
|
|||
/// Remove the back label
|
|||
///
|
|||
/// Returns `false` if the name was the root (".")
|
|||
pub fn try_pop_back(&mut self) -> bool { |
|||
match self.label_offsets { |
|||
LabelOffsets::Uncompressed(ref mut offs) => { |
|||
if offs.is_empty() { return false; } |
|||
self.total_len -= self.data[offs[offs.len()-1] as usize] + 1; |
|||
offs.pop(); |
|||
}, |
|||
LabelOffsets::Compressed(ref mut start_pos, ref mut offs) => { |
|||
if offs.is_empty() { return false; } |
|||
match offs[offs.len()-1] { |
|||
LabelOffset::LabelStart(o) => { |
|||
self.total_len -= self.data[*start_pos + o as usize] + 1; |
|||
}, |
|||
LabelOffset::PacketStart(o) => { |
|||
self.total_len -= self.data[o as usize] + 1; |
|||
}, |
|||
} |
|||
offs.pop(); |
|||
}, |
|||
} |
|||
true |
|||
} |
|||
|
|||
/// Remove the back label
|
|||
///
|
|||
/// # Panics
|
|||
///
|
|||
/// Panics if the name was the root (".")
|
|||
pub fn pop_back(&mut self) { |
|||
if !self.try_pop_back() { panic!("Cannot pop label from root name") } |
|||
} |
|||
|
|||
/// Insert a new label at the back
|
|||
///
|
|||
/// Returns an error if the resulting name would be too long
|
|||
pub fn push_back<'a, L: Into<DnsLabelRef<'a>>>(&mut self, label: L) -> Result<()> { |
|||
let label = label.into(); |
|||
if label.len() > 254 - self.total_len { bail!("Cannot append label, resulting name too long") } |
|||
let (mut data, start) = self.reserve(0, label.len() as usize + 1); |
|||
|
|||
let new_label_pos = start + self.total_len as usize - 1; |
|||
data[new_label_pos] = label.len(); |
|||
data[new_label_pos+1..new_label_pos+1+label.len() as usize].copy_from_slice(label.as_raw()); |
|||
data[new_label_pos+1+label.len() as usize] = 0; |
|||
self.data = data.freeze(); |
|||
self.total_len += label.len() + 1; |
|||
match self.label_offsets { |
|||
LabelOffsets::Uncompressed(ref mut offs) => { |
|||
offs.push(new_label_pos as u8); |
|||
}, |
|||
LabelOffsets::Compressed(_, _) => unreachable!(), |
|||
} |
|||
|
|||
Ok(()) |
|||
} |
|||
|
|||
// returns mutable buffer and position of the start of the current
|
|||
// name (null terminated).
|
|||
//
|
|||
// adjusts self.label_offsets accordingly
|
|||
fn reserve(&mut self, prefix: usize, suffix: usize) -> (BytesMut, usize) { |
|||
use std::ptr; |
|||
|
|||
let new_len = self.total_len as usize + prefix + suffix; |
|||
assert!(new_len < 256); |
|||
self.uncompress(prefix, suffix); |
|||
let label_offsets = match self.label_offsets { |
|||
LabelOffsets::Uncompressed(ref mut offs) => offs, |
|||
LabelOffsets::Compressed(_, _) => unreachable!(), |
|||
}; |
|||
// steal buffer from self (so it has a change to be owned)
|
|||
let data = self.data.split_off(0).try_mut(); |
|||
|
|||
if label_offsets.is_empty() { |
|||
// root name
|
|||
let mut data = data.unwrap_or_else(|_| BytesMut::with_capacity(new_len)); |
|||
data.put_u8(0); |
|||
return (data, 0) |
|||
} |
|||
|
|||
let old_start = label_offsets[0] as usize; |
|||
// if current "prefix" space (old_start) is bigger than
|
|||
// requested but fits, just increase the prefix
|
|||
let (prefix, new_len) = if old_start > prefix && self.total_len as usize + old_start + suffix < 256 { |
|||
(old_start, self.total_len as usize + old_start + suffix) |
|||
} else { |
|||
(prefix, new_len) |
|||
}; |
|||
|
|||
// check if we need to reallocate
|
|||
let data = match data { |
|||
Ok(data) => { |
|||
if data.capacity() < new_len { |
|||
// need a new allocation anyway, pretend we couldn't
|
|||
// own the buffer
|
|||
Err(data.freeze()) |
|||
} else { |
|||
Ok(data) |
|||
} |
|||
}, |
|||
Err(data) => Err(data), |
|||
}; |
|||
|
|||
|
|||
match data { |
|||
Ok(mut data) => { |
|||
if data.len() < new_len { |
|||
let add = new_len - data.len(); |
|||
data.reserve(add); |
|||
unsafe { data.set_len(new_len); } |
|||
} |
|||
if old_start < prefix { |
|||
// need more space in front, move back
|
|||
let p_old = &data[old_start as usize] as *const u8; |
|||
let p_new = &mut data[prefix] as *mut u8; |
|||
unsafe { |
|||
ptr::copy(p_old, p_new, self.total_len as usize); |
|||
} |
|||
// adjust labels
|
|||
for o in label_offsets.iter_mut() { |
|||
*o = *o + (prefix - old_start) as u8; |
|||
} |
|||
return (data, prefix); |
|||
} else if old_start > prefix { |
|||
// too much space in front, (suffix didn't fit into
|
|||
// length restriction, see check above), move to
|
|||
// front
|
|||
let p_old = &data[old_start as usize] as *const u8; |
|||
let p_new = &mut data[prefix] as *mut u8; |
|||
unsafe { |
|||
ptr::copy(p_old, p_new, self.total_len as usize); |
|||
} |
|||
// adjust labels
|
|||
for o in label_offsets.iter_mut() { |
|||
*o = *o - (old_start - prefix) as u8; |
|||
} |
|||
return (data, prefix); |
|||
} else { |
|||
return (data, old_start); |
|||
} |
|||
}, |
|||
Err(data) => { |
|||
let mut new_data = BytesMut::with_capacity(new_len); |
|||
unsafe { new_data.set_len(new_len); } |
|||
// copy old data
|
|||
new_data[prefix..prefix + self.total_len as usize].copy_from_slice(&data[old_start..old_start+self.total_len as usize]); |
|||
// adjust labels
|
|||
for o in label_offsets.iter_mut() { |
|||
*o = (*o - old_start as u8) + prefix as u8; |
|||
} |
|||
return (new_data, prefix); |
|||
}, |
|||
} |
|||
} |
|||
|
|||
/// return encoded (uncompressed) representation
|
|||
///
|
|||
/// might uncompress the inner representation.
|
|||
pub fn encode(&mut self) -> Bytes { |
|||
self.uncompress(0, 0); |
|||
if self.is_root() { |
|||
return Bytes::from_static(b"\x00"); |
|||
} |
|||
// at least one label, find first one
|
|||
let from = self.label_offsets.label_pos(0); |
|||
self.data.slice(from, from + self.total_len as usize) |
|||
} |
|||
|
|||
fn uncompress(&mut self, prefix_capacity: usize, suffix_capacity: usize) { |
|||
if self.label_offsets.is_compressed() { |
|||
let name = { |
|||
let labels = self.labels(); |
|||
let label_count = labels.len(); |
|||
let new_len = self.total_len as usize + prefix_capacity + suffix_capacity; |
|||
assert!(new_len < 256); |
|||
let mut data = BytesMut::with_capacity(new_len); |
|||
let mut offsets = SmallVec::<[u8;16]>::with_capacity(label_count); |
|||
unsafe { data.set_len(prefix_capacity) } |
|||
let mut pos = prefix_capacity as u8; |
|||
|
|||
for label in labels { |
|||
offsets.push(pos); |
|||
pos += label.len() + 1; |
|||
data.put_u8(label.len()); |
|||
data.put_slice(label.as_raw()); |
|||
} |
|||
data.put_u8(0); |
|||
|
|||
DnsName{ |
|||
data: data.freeze(), |
|||
label_offsets: LabelOffsets::Uncompressed(offsets), |
|||
total_len: self.total_len, |
|||
} |
|||
}; |
|||
*self = name |
|||
} |
|||
} |
|||
} |
|||
@ -0,0 +1,81 @@ |
|||
use bytes::Buf; |
|||
use super::*; |
|||
|
|||
impl DnsName { |
|||
/// `data`: bytes of packet from beginning until at least the end of the name
|
|||
/// `start_pos`: position of first byte of the name
|
|||
/// `uncmpr_offsets`: offsets of uncompressed labels so far
|
|||
/// `label_len`: first compressed label length (`0xc0 | offset`)
|
|||
/// `total_len`: length of (uncompressed) label encoding so far
|
|||
fn parse_name_compressed_cont(data: Bytes, start_pos: usize, uncmpr_offsets: SmallVec<[u8;16]>, mut total_len: usize, mut label_len: u8) -> Result<Self> { |
|||
let mut label_offsets = uncmpr_offsets.into_iter() |
|||
.map(LabelOffset::LabelStart) |
|||
.collect::<SmallVec<_>>(); |
|||
|
|||
let mut pos = start_pos + total_len; |
|||
'next_compressed: loop { |
|||
{ |
|||
let new_pos = (label_len & 0x3f) as usize; |
|||
if new_pos >= pos { bail!("Compressed label offset to big") } |
|||
pos = new_pos; |
|||
} |
|||
|
|||
loop { |
|||
label_len = data[pos]; |
|||
|
|||
if 0 == label_len { |
|||
return Ok(DnsName{ |
|||
data: data, |
|||
label_offsets: LabelOffsets::Compressed(start_pos, label_offsets), |
|||
total_len: total_len as u8 + 1, |
|||
}) |
|||
} |
|||
|
|||
if label_len & 0xc == 0xc { continue 'next_compressed; } |
|||
if label_len > 63 { bail!("Invalid label length {}", label_len) } |
|||
|
|||
total_len += 1 + label_len as usize; |
|||
// max len 255, but there also needs to be an empty label at the end
|
|||
if total_len > 254 { bail!("DNS name too long") } |
|||
|
|||
label_offsets.push(LabelOffset::PacketStart(pos as u8)); |
|||
pos += 1 + label_len as usize; |
|||
} |
|||
} |
|||
} |
|||
|
|||
pub(super) fn parse_name(data: &mut Cursor<Bytes>, accept_compressed: bool) -> Result<Self> { |
|||
check_enough_data!(data, 1, "DnsName"); |
|||
let start_pos = data.position() as usize; |
|||
let mut total_len : usize = 0; |
|||
let mut label_offsets = SmallVec::new(); |
|||
loop { |
|||
check_enough_data!(data, 1, "DnsName label len"); |
|||
let label_len = data.get_u8() as usize; |
|||
if 0 == label_len { |
|||
let end_pos = data.position() as usize; |
|||
return Ok(DnsName{ |
|||
data: data.get_ref().slice(start_pos, end_pos), |
|||
label_offsets: LabelOffsets::Uncompressed(label_offsets), |
|||
total_len: total_len as u8 + 1, |
|||
}) |
|||
} |
|||
if label_len & 0xc0 == 0xc0 { |
|||
// compressed label
|
|||
if !accept_compressed { bail!("Invalid label compression {}", label_len) } |
|||
|
|||
let end_pos = data.position() as usize; |
|||
let data = data.get_ref().slice(0, end_pos); |
|||
|
|||
return Self::parse_name_compressed_cont(data, start_pos, label_offsets, total_len, label_len as u8); |
|||
} |
|||
label_offsets.push(total_len as u8); |
|||
if label_len > 63 { bail!("Invalid label length {}", label_len) } |
|||
total_len += 1 + label_len; |
|||
// max len 255, but there also needs to be an empty label at the end
|
|||
if total_len > 254 { bail!{"DNS name too long"} } |
|||