trust-dns 0.11.0

TRust-DNS is a safe and secure DNS library. This is the Client library with DNSec support. DNSSec with NSEC validation for negative records, is complete. The client supports dynamic DNS with SIG0 authenticated requests, implementing easy to use high level funtions. TRust-DNS is based on the Tokio and Futures libraries, which means it should be easily integrated into other software that also use those libraries.
Documentation 
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/*
 * Copyright (C) 2015 Benjamin Fry <benjaminfry@me.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
use std::num;
use std::io;
use std::net::AddrParseError;

use super::decode_error;
use super::lexer_error;
use serialize::txt::Token;

error_chain! {
    // The type defined for this error. These are the conventional
    // and recommended names, but they can be arbitrarily chosen.
    types {
        Error, ErrorKind, ChainErr, Result;
    }

    // Automatic conversions between this error chain and other
    // error chains. In this case, it will e.g. generate an
    // `ErrorKind` variant called `Dist` which in turn contains
    // the `rustup_dist::ErrorKind`, with conversions from
    // `rustup_dist::Error`.
    //
    // This section can be empty.
    links {
      decode_error::Error, decode_error::ErrorKind, Decode;
      lexer_error::Error, lexer_error::ErrorKind, Lexer;
    }

    // Automatic conversions between this error chain and other
    // error types not defined by the `error_chain!`. These will be
    // boxed as the error cause and wrapped in a new error with,
    // in this case, the `ErrorKind::Temp` variant.
    //
    // This section can be empty.
    foreign_links {
      io::Error, Io, "io error";
      num::ParseIntError, ParseInt, "parse int error";
      AddrParseError, AddrParse, "address parse error";
    }

    // Define additional `ErrorKind` variants. The syntax here is
    // the same as `quick_error!`, but the `from()` and `cause()`
    // syntax is not supported.
    errors {
      Message(msg: &'static str) {
        description(msg)
        display("{}", msg)
      }

      UnexpectedToken(token: Token) {
        description("unrecognized token in stream")
        display("unrecognized token in stream: {:?}", token)
      }

      MissingToken(string: String) {
        description("token is missing")
        display("token is missing: {}", string)
      }

      CharToIntError(ch: char) {
        description("invalid numerical character")
        display("invalid numerical character: {}", ch)
      }

      ParseTimeError(string: String) {
        description("invalid time string")
        display("invalid time string: {}", string)
      }
    }
}

impl From<Error> for io::Error {
    fn from(e: Error) -> Self {
        io::Error::new(io::ErrorKind::Other, format!("DNS ParseError: {}", e))
    }
}