kea/src/lib/dns/rdata/generic/sshfp_44.cc

// Copyright (C) 2012  Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.

#include <config.h>

#include <string>

#include <boost/lexical_cast.hpp>

#include <exceptions/exceptions.h>

#include <util/buffer.h>
#include <util/encode/hex.h>
#include <dns/name.h>
#include <dns/messagerenderer.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>

using namespace std;
using namespace boost;
using namespace isc::util;
using namespace isc::util::encode;

// BEGIN_ISC_NAMESPACE
// BEGIN_RDATA_NAMESPACE

SSHFP::SSHFP(InputBuffer& buffer, size_t rdata_len)
{
    if (rdata_len < 2) {
      isc_throw(InvalidRdataLength, "SSHFP record too short");
    }

    algorithm_ = buffer.readUint8();
    fingerprint_type_ = buffer.readUint8();

    rdata_len -= 2;
    fingerprint_.resize(rdata_len);
    buffer.readData(&fingerprint_[0], rdata_len);
}

SSHFP::SSHFP(const std::string& sshfp_str)
{
    std::istringstream iss(sshfp_str);
    // peekc should be of iss's char_type for isspace to work
    std::istringstream::char_type peekc;
    std::stringbuf fingerprintbuf;
    uint32_t algorithm, fingerprint_type;

    iss >> algorithm >> fingerprint_type;
    if (iss.bad() || iss.fail()) {
      isc_throw(InvalidRdataText, "Invalid SSHFP text");
    }
    if ((algorithm < 1) || (algorithm > 2)) {
      isc_throw(InvalidRdataText, "SSHFP algorithm number out of range");
    }
    if (fingerprint_type != 1) {
      isc_throw(InvalidRdataText, "SSHFP fingerprint type out of range");
    }

    iss.read(&peekc, 1);
    if (!iss.good() || !isspace(peekc, iss.getloc())) {
      isc_throw(InvalidRdataText, "SSHFP presentation format error");
    }

    iss >> &fingerprintbuf;

    algorithm_ = algorithm;
    fingerprint_type_ = fingerprint_type;
    decodeHex(fingerprintbuf.str(), fingerprint_);
}

SSHFP::SSHFP(uint8_t algorithm, uint8_t fingerprint_type, const std::string& fingerprint)
{
    if ((algorithm < 1) || (algorithm > 2)) {
      isc_throw(InvalidRdataText, "SSHFP algorithm number out of range");
    }
    if (fingerprint_type != 1) {
      isc_throw(InvalidRdataText, "SSHFP fingerprint type out of range");
    }

    algorithm_ = algorithm;
    fingerprint_type_ = fingerprint_type;
    decodeHex(fingerprint, fingerprint_);
}

SSHFP::SSHFP(const SSHFP& other) :
  Rdata(), algorithm_(other.algorithm_), fingerprint_type_(other.fingerprint_type_), fingerprint_(other.fingerprint_)
{}

void
SSHFP::toWire(OutputBuffer& buffer) const {
    buffer.writeUint8(algorithm_);
    buffer.writeUint8(fingerprint_type_);
    buffer.writeData(&fingerprint_[0], fingerprint_.size());
}

void
SSHFP::toWire(AbstractMessageRenderer& renderer) const {
    renderer.writeUint8(algorithm_);
    renderer.writeUint8(fingerprint_type_);
    renderer.writeData(&fingerprint_[0], fingerprint_.size());
}

string
SSHFP::toText() const {
    return (lexical_cast<string>(static_cast<int>(algorithm_)) +
            " " + lexical_cast<string>(static_cast<int>(fingerprint_type_)) +
            " " + encodeHex(fingerprint_));
}

int
SSHFP::compare(const Rdata& other) const {
    const SSHFP& other_sshfp = dynamic_cast<const SSHFP&>(other);

    /* This doesn't really make any sort of sense, but in the name of
       consistency... */

    if (algorithm_ < other_sshfp.algorithm_) {
        return (-1);
    } else if (algorithm_ > other_sshfp.algorithm_) {
        return (1);
    }

    if (fingerprint_type_ < other_sshfp.fingerprint_type_) {
        return (-1);
    } else if (fingerprint_type_ > other_sshfp.fingerprint_type_) {
        return (1);
    }

    size_t this_len = fingerprint_.size();
    size_t other_len = other_sshfp.fingerprint_.size();
    size_t cmplen = min(this_len, other_len);
    int cmp = memcmp(&fingerprint_[0], &other_sshfp.fingerprint_[0], cmplen);
    if (cmp != 0) {
      return (cmp);
    } else {
      return ((this_len == other_len)
	      ? 0 : (this_len < other_len) ? -1 : 1);
    }
}

uint8_t
SSHFP::getSSHFPAlgorithmNumber() const {
    return (algorithm_);
}

uint8_t
SSHFP::getSSHFPFingerprintType() const {
    return (fingerprint_type_);
}

// END_RDATA_NAMESPACE
// END_ISC_NAMESPACE