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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "syncres.hh"
#include "reczones-helpers.hh"
template <typename T>
static SyncRes::AuthDomain makeSOAAndNSNodes(DNSRecord& dr, T content)
{
dr.d_class = 1;
dr.d_place = DNSResourceRecord::ANSWER;
dr.d_ttl = 86400;
dr.d_type = QType::SOA;
dr.d_content = DNSRecordContent::mastermake(QType::SOA, 1, "localhost. root 1 604800 86400 2419200 604800");
SyncRes::AuthDomain ad;
ad.d_rdForward = false;
ad.d_records.insert(dr);
dr.d_type = QType::NS;
dr.d_content = std::make_shared<NSRecordContent>(content);
ad.d_records.insert(dr);
return ad;
}
static void addToDomainMap(SyncRes::domainmap_t& newMap,
SyncRes::AuthDomain ad,
DNSName& name,
Logr::log_t log,
const bool partial = false,
const bool reverse = false)
{
if (newMap.count(name) != 0) {
SLOG(g_log << Logger::Warning << "Will not overwrite zone '" << name << "' already loaded" << endl,
log->info(Logr::Warning, "Will not overwrite already loaded zone", "zone",
Logging::Loggable(name)));
}
else {
if (!partial) {
const auto direction = reverse ? std::string{"reverse"} : std::string{"forward"};
SLOG(g_log << Logger::Warning << "Inserting " << direction << " zone '" << name << "' based on hosts file" << endl,
log->info(Logr::Notice, "Inserting " + direction + " zone based on hosts file", "zone", Logging::Loggable(name)));
}
ad.d_name = name;
newMap[ad.d_name] = ad;
}
}
static void makeNameToIPZone(SyncRes::domainmap_t& newMap,
const DNSName& hostname,
const ComboAddress& address,
Logr::log_t log)
{
DNSRecord dr;
dr.d_name = hostname;
SyncRes::AuthDomain ad = makeSOAAndNSNodes(dr, "localhost.");
auto recType = address.isIPv6() ? QType::AAAA : QType::A;
dr.d_type = recType;
dr.d_content = DNSRecordContent::mastermake(recType, 1, address.toStringNoInterface());
ad.d_records.insert(dr);
addToDomainMap(newMap, ad, dr.d_name, log);
}
static void makeIPToNamesZone(SyncRes::domainmap_t& newMap,
const ComboAddress& address,
const std::string& canonicalHostname,
Logr::log_t log)
{
DNSRecord dr;
dr.d_name = DNSName(address.toStringReversed());
dr.d_name.appendRawLabel(address.isIPv4() ? "in-addr" : "ip6");
dr.d_name.appendRawLabel("arpa");
SyncRes::AuthDomain ad = makeSOAAndNSNodes(dr, DNSName("localhost."));
// Add a PTR entry for the primary name for reverse lookups.
dr.d_type = QType::PTR;
dr.d_content = DNSRecordContent::mastermake(QType::PTR, 1, DNSName(canonicalHostname).toString());
ad.d_records.insert(dr);
addToDomainMap(newMap, ad, dr.d_name, log, false, true);
}
void makePartialIPZone(SyncRes::domainmap_t& newMap,
std::initializer_list<const char*> labels,
Logr::log_t log)
{
DNSRecord dr;
for (auto label = std::rbegin(labels); label != std::rend(labels); ++label) {
dr.d_name.appendRawLabel(*label);
}
dr.d_name.appendRawLabel("in-addr");
dr.d_name.appendRawLabel("arpa");
SyncRes::AuthDomain ad = makeSOAAndNSNodes(dr, DNSName("localhost."));
addToDomainMap(newMap, ad, dr.d_name, log, true, true);
}
void addForwardAndReverseLookupEntries(SyncRes::domainmap_t& newMap,
const std::string& searchSuffix,
const std::vector<std::string>& parts,
Logr::log_t log)
{
const ComboAddress address{parts[0]};
// Go over the hostname and aliases (parts[1], parts[2], etc...) and add entries
// for forward lookups.
for (auto name = parts.cbegin() + 1; name != parts.cend(); ++name) {
if (searchSuffix.empty() || name->find('.') != string::npos) {
makeNameToIPZone(newMap, DNSName(*name), address, log);
}
else {
DNSName canonical = toCanonic(DNSName(searchSuffix), *name);
if (canonical != DNSName(*name)) {
makeNameToIPZone(newMap, canonical, address, log);
}
}
}
// Add entries for the primary name for reverse lookups.
makeIPToNamesZone(newMap, address, parts[1], log);
}
bool parseEtcHostsLine(std::vector<std::string>& parts, std::string& line)
{
const string::size_type pos = line.find('#');
if (pos != string::npos) {
line.resize(pos);
}
boost::trim(line);
if (line.empty()) {
return false;
}
parts.clear();
stringtok(parts, line, "\t\r\n ");
return parts.size() >= 2;
}
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