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// Copyright (C) 2010-2015 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <iostream>
#include <string>
#include <sstream>
#include <vector>
#include <util/encode/base64.h>
#include <util/buffer.h>
#include <dns/exceptions.h>
#include <dns/messagerenderer.h>
#include <dns/name.h>
#include <dns/rrtype.h>
#include <dns/rrttl.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>
#include <dns/rdata/generic/detail/nsec_bitmap.h>
#include <dns/rdata/generic/detail/lexer_util.h>
#include <stdio.h>
#include <time.h>
using namespace std;
using namespace isc::util;
using namespace isc::util::encode;
using namespace isc::dns::rdata::generic::detail::nsec;
using isc::dns::rdata::generic::detail::createNameFromLexer;
// BEGIN_ISC_NAMESPACE
// BEGIN_RDATA_NAMESPACE
struct NSECImpl {
// straightforward representation of NSEC RDATA fields
NSECImpl(const Name& next, vector<uint8_t> typebits) :
nextname_(next), typebits_(typebits)
{}
Name nextname_;
vector<uint8_t> typebits_;
};
/// \brief Constructor from string.
///
/// The given string must represent a valid NSEC RDATA. There
/// can be extra space characters at the beginning or end of the
/// text (which are simply ignored), but other extra text, including
/// a new line, will make the construction fail with an exception.
///
/// The Next Domain Name field must be absolute since there's no
/// parameter that specifies the origin name; if it is not absolute,
/// \c MissingNameOrigin exception will be thrown. This must not be
/// represented as a quoted string.
///
/// The type mnemonics must be valid, and separated by whitespace. If
/// any invalid mnemonics are found, InvalidRdataText exception is
/// thrown.
///
/// \throw MissingNameOrigin Thrown when the Next Domain Name is not absolute.
/// \throw InvalidRdataText if any fields are out of their valid range.
///
/// \param nsec_str A string containing the RDATA to be created
NSEC::NSEC(const std::string& nsec_str) :
impl_(NULL)
{
try {
std::istringstream ss(nsec_str);
MasterLexer lexer;
lexer.pushSource(ss);
const Name origin_name(createNameFromLexer(lexer, NULL));
vector<uint8_t> typebits;
buildBitmapsFromLexer("NSEC", lexer, typebits);
impl_ = new NSECImpl(origin_name, typebits);
if (lexer.getNextToken().getType() != MasterToken::END_OF_FILE) {
isc_throw(InvalidRdataText,
"Extra input text for NSEC: " << nsec_str);
}
} catch (const MasterLexer::LexerError& ex) {
isc_throw(InvalidRdataText,
"Failed to construct NSEC from '" << nsec_str << "': "
<< ex.what());
}
}
NSEC::NSEC(InputBuffer& buffer, size_t rdata_len) {
const size_t pos = buffer.getPosition();
const Name nextname(buffer);
// rdata_len must be sufficiently large to hold non empty bitmap.
if (rdata_len <= buffer.getPosition() - pos) {
isc_throw(DNSMessageFORMERR,
"NSEC RDATA from wire too short: " << rdata_len << "bytes");
}
rdata_len -= (buffer.getPosition() - pos);
vector<uint8_t> typebits(rdata_len);
buffer.readData(&typebits[0], rdata_len);
checkRRTypeBitmaps("NSEC", typebits);
impl_ = new NSECImpl(nextname, typebits);
}
/// \brief Constructor with a context of MasterLexer.
///
/// The \c lexer should point to the beginning of valid textual
/// representation of an NSEC RDATA.
///
/// The Next Domain Name field can be non-absolute if \c origin is
/// non-NULL, in which case \c origin is used to make it absolute. It
/// must not be represented as a quoted string.
///
/// The type mnemonics must be valid, and separated by whitespace. If
/// any invalid mnemonics are found, InvalidRdataText exception is
/// thrown.
///
/// \throw MasterLexer::LexerError General parsing error such as
/// missing field.
/// \throw MissingNameOrigin Thrown when the Next Domain Name is not
/// absolute and \c origin is NULL.
/// \throw InvalidRdataText if any fields are out of their valid range.
///
/// \param lexer A \c MasterLexer object parsing a master file for the
/// RDATA to be created
/// \param origin The origin to use with a relative Next Domain Name
/// field
NSEC::NSEC(MasterLexer& lexer, const Name* origin, MasterLoader::Options,
MasterLoaderCallbacks&)
{
const Name next_name(createNameFromLexer(lexer, origin));
vector<uint8_t> typebits;
buildBitmapsFromLexer("NSEC", lexer, typebits);
impl_ = new NSECImpl(next_name, typebits);
}
NSEC::NSEC(const NSEC& source) :
Rdata(), impl_(new NSECImpl(*source.impl_))
{}
NSEC&
NSEC::operator=(const NSEC& source) {
if (this == &source) {
return (*this);
}
NSECImpl* newimpl = new NSECImpl(*source.impl_);
delete impl_;
impl_ = newimpl;
return (*this);
}
NSEC::~NSEC() {
delete impl_;
}
string
NSEC::toText() const {
ostringstream s;
s << impl_->nextname_;
bitmapsToText(impl_->typebits_, s);
return (s.str());
}
void
NSEC::toWire(OutputBuffer& buffer) const {
impl_->nextname_.toWire(buffer);
buffer.writeData(&impl_->typebits_[0], impl_->typebits_.size());
}
void
NSEC::toWire(AbstractMessageRenderer& renderer) const {
// Type NSEC is not "well-known", and name compression must be disabled
// per RFC3597.
renderer.writeName(impl_->nextname_, false);
renderer.writeData(&impl_->typebits_[0], impl_->typebits_.size());
}
const Name&
NSEC::getNextName() const {
return (impl_->nextname_);
}
int
NSEC::compare(const Rdata& other) const {
const NSEC& other_nsec = dynamic_cast<const NSEC&>(other);
int cmp = compareNames(impl_->nextname_, other_nsec.impl_->nextname_);
if (cmp != 0) {
return (cmp);
}
const size_t this_len = impl_->typebits_.size();
const size_t other_len = other_nsec.impl_->typebits_.size();
const size_t cmplen = min(this_len, other_len);
cmp = memcmp(&impl_->typebits_[0], &other_nsec.impl_->typebits_[0],
cmplen);
if (cmp != 0) {
return (cmp);
} else {
return ((this_len == other_len) ? 0 : (this_len < other_len) ? -1 : 1);
}
}
// END_RDATA_NAMESPACE
// END_ISC_NAMESPACE
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