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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.
*/
#include "config.h"
#ifdef HAVE_NGHTTP2
#include <nghttp2/nghttp2.h>
#endif /* HAVE_NGHTTP2 */
#include "dnsdist-nghttp2.hh"
#include "dnsdist-tcp.hh"
#include "dnsdist-tcp-downstream.hh"
#include "dolog.hh"
#include "iputils.hh"
#include "libssl.hh"
#include "noinitvector.hh"
#include "tcpiohandler.hh"
#include "threadname.hh"
#include "sstuff.hh"
std::atomic<uint64_t> g_dohStatesDumpRequested{0};
std::unique_ptr<DoHClientCollection> g_dohClientThreads{nullptr};
std::optional<uint16_t> g_outgoingDoHWorkerThreads{std::nullopt};
#ifdef HAVE_NGHTTP2
class DoHConnectionToBackend : public ConnectionToBackend
{
public:
DoHConnectionToBackend(const std::shared_ptr<DownstreamState>& ds, std::unique_ptr<FDMultiplexer>& mplexer, const struct timeval& now, std::string&& proxyProtocolPayload);
void handleTimeout(const struct timeval& now, bool write) override;
void queueQuery(std::shared_ptr<TCPQuerySender>& sender, TCPQuery&& query) override;
std::string toString() const override
{
ostringstream o;
o << "DoH connection to backend " << (d_ds ? d_ds->getName() : "empty") << " over FD " << (d_handler ? std::to_string(d_handler->getDescriptor()) : "no socket") << ", " << getConcurrentStreamsCount() << " streams";
return o.str();
}
void setHealthCheck(bool h)
{
d_healthCheckQuery = h;
}
void stopIO() override;
bool reachedMaxConcurrentQueries() const override;
bool reachedMaxStreamID() const override;
bool isIdle() const override;
void release() override
{
}
private:
static ssize_t send_callback(nghttp2_session* session, const uint8_t* data, size_t length, int flags, void* user_data);
static int on_frame_recv_callback(nghttp2_session* session, const nghttp2_frame* frame, void* user_data);
static int on_data_chunk_recv_callback(nghttp2_session* session, uint8_t flags, int32_t stream_id, const uint8_t* data, size_t len, void* user_data);
static int on_stream_close_callback(nghttp2_session* session, int32_t stream_id, uint32_t error_code, void* user_data);
static int on_header_callback(nghttp2_session* session, const nghttp2_frame* frame, const uint8_t* name, size_t namelen, const uint8_t* value, size_t valuelen, uint8_t flags, void* user_data);
static int on_error_callback(nghttp2_session* session, int lib_error_code, const char* msg, size_t len, void* user_data);
static void handleReadableIOCallback(int fd, FDMultiplexer::funcparam_t& param);
static void handleWritableIOCallback(int fd, FDMultiplexer::funcparam_t& param);
static void addStaticHeader(std::vector<nghttp2_nv>& headers, const std::string& nameKey, const std::string& valueKey);
static void addDynamicHeader(std::vector<nghttp2_nv>& headers, const std::string& nameKey, const std::string& value);
class PendingRequest
{
public:
std::shared_ptr<TCPQuerySender> d_sender{nullptr};
TCPQuery d_query;
PacketBuffer d_buffer;
size_t d_queryPos{0};
uint16_t d_responseCode{0};
bool d_finished{false};
};
void addToIOState(IOState state, FDMultiplexer::callbackfunc_t callback);
void updateIO(IOState newState, FDMultiplexer::callbackfunc_t callback, bool noTTD = false);
void watchForRemoteHostClosingConnection();
void handleResponse(PendingRequest&& request);
void handleResponseError(PendingRequest&& request, const struct timeval& now);
void handleIOError();
uint32_t getConcurrentStreamsCount() const;
size_t getUsageCount() const
{
auto ref = shared_from_this();
return ref.use_count();
}
static const std::unordered_map<std::string, std::string> s_constants;
std::unordered_map<int32_t, PendingRequest> d_currentStreams;
std::string d_proxyProtocolPayload;
PacketBuffer d_out;
PacketBuffer d_in;
std::unique_ptr<nghttp2_session, void (*)(nghttp2_session*)> d_session{nullptr, nghttp2_session_del};
size_t d_outPos{0};
size_t d_inPos{0};
bool d_healthCheckQuery{false};
bool d_firstWrite{true};
};
using DownstreamDoHConnectionsManager = DownstreamConnectionsManager<DoHConnectionToBackend>;
thread_local DownstreamDoHConnectionsManager t_downstreamDoHConnectionsManager;
uint32_t DoHConnectionToBackend::getConcurrentStreamsCount() const
{
return d_currentStreams.size();
}
void DoHConnectionToBackend::handleResponse(PendingRequest&& request)
{
struct timeval now;
gettimeofday(&now, nullptr);
try {
request.d_sender->handleResponse(now, TCPResponse(std::move(request.d_buffer), std::move(request.d_query.d_idstate), shared_from_this()));
}
catch (const std::exception& e) {
vinfolog("Got exception while handling response for cross-protocol DoH: %s", e.what());
}
}
void DoHConnectionToBackend::handleResponseError(PendingRequest&& request, const struct timeval& now)
{
try {
request.d_sender->notifyIOError(std::move(request.d_query.d_idstate), now);
}
catch (const std::exception& e) {
vinfolog("Got exception while handling response for cross-protocol DoH: %s", e.what());
}
}
void DoHConnectionToBackend::handleIOError()
{
d_connectionDied = true;
nghttp2_session_terminate_session(d_session.get(), NGHTTP2_PROTOCOL_ERROR);
struct timeval now;
gettimeofday(&now, nullptr);
for (auto& request : d_currentStreams) {
handleResponseError(std::move(request.second), now);
}
d_currentStreams.clear();
stopIO();
}
void DoHConnectionToBackend::handleTimeout(const struct timeval& now, bool write)
{
if (write) {
if (d_firstWrite) {
++d_ds->tcpConnectTimeouts;
}
else {
++d_ds->tcpWriteTimeouts;
}
}
else {
++d_ds->tcpReadTimeouts;
}
handleIOError();
}
bool DoHConnectionToBackend::reachedMaxStreamID() const
{
const uint32_t maximumStreamID = (static_cast<uint32_t>(1) << 31) - 1;
return d_highestStreamID == maximumStreamID;
}
bool DoHConnectionToBackend::reachedMaxConcurrentQueries() const
{
//cerr<<"Got "<<getConcurrentStreamsCount()<<" concurrent streams, max is "<<nghttp2_session_get_remote_settings(d_session.get(), NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS)<<endl;
if (nghttp2_session_get_remote_settings(d_session.get(), NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS) <= getConcurrentStreamsCount()) {
return true;
}
return false;
}
bool DoHConnectionToBackend::isIdle() const
{
return getConcurrentStreamsCount() == 0;
}
const std::unordered_map<std::string, std::string> DoHConnectionToBackend::s_constants = {
{"method-name", ":method"},
{"method-value", "POST"},
{"scheme-name", ":scheme"},
{"scheme-value", "https"},
{"accept-name", "accept"},
{"accept-value", "application/dns-message"},
{"content-type-name", "content-type"},
{"content-type-value", "application/dns-message"},
{"user-agent-name", "user-agent"},
{"user-agent-value", "nghttp2-" NGHTTP2_VERSION "/dnsdist"},
{"authority-name", ":authority"},
{"path-name", ":path"},
{"content-length-name", "content-length"},
{"x-forwarded-for-name", "x-forwarded-for"},
{"x-forwarded-port-name", "x-forwarded-port"},
{"x-forwarded-proto-name", "x-forwarded-proto"},
{"x-forwarded-proto-value-dns-over-udp", "dns-over-udp"},
{"x-forwarded-proto-value-dns-over-tcp", "dns-over-tcp"},
{"x-forwarded-proto-value-dns-over-tls", "dns-over-tls"},
{"x-forwarded-proto-value-dns-over-http", "dns-over-http"},
{"x-forwarded-proto-value-dns-over-https", "dns-over-https"},
};
void DoHConnectionToBackend::addStaticHeader(std::vector<nghttp2_nv>& headers, const std::string& nameKey, const std::string& valueKey)
{
const auto& name = s_constants.at(nameKey);
const auto& value = s_constants.at(valueKey);
headers.push_back({const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(name.c_str())), const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(value.c_str())), name.size(), value.size(), NGHTTP2_NV_FLAG_NO_COPY_NAME | NGHTTP2_NV_FLAG_NO_COPY_VALUE});
}
void DoHConnectionToBackend::addDynamicHeader(std::vector<nghttp2_nv>& headers, const std::string& nameKey, const std::string& value)
{
const auto& name = s_constants.at(nameKey);
headers.push_back({const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(name.c_str())), const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(value.c_str())), name.size(), value.size(), NGHTTP2_NV_FLAG_NO_COPY_NAME | NGHTTP2_NV_FLAG_NO_COPY_VALUE});
}
void DoHConnectionToBackend::queueQuery(std::shared_ptr<TCPQuerySender>& sender, TCPQuery&& query)
{
auto payloadSize = std::to_string(query.d_buffer.size());
bool addXForwarded = d_ds->d_addXForwardedHeaders;
/* We use nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_NAME and nghttp2_nv_flag.NGHTTP2_NV_FLAG_NO_COPY_VALUE
to avoid a copy and lowercasing but we need to make sure that the data will outlive the request (nghttp2_on_frame_send_callback called), and that it is already lowercased. */
std::vector<nghttp2_nv> headers;
// these need to live until after the request headers have been processed
std::string remote;
std::string remotePort;
headers.reserve(8 + (addXForwarded ? 3 : 0));
/* Pseudo-headers need to come first (rfc7540 8.1.2.1) */
addStaticHeader(headers, "method-name", "method-value");
addStaticHeader(headers, "scheme-name", "scheme-value");
addDynamicHeader(headers, "authority-name", d_ds->d_tlsSubjectName);
addDynamicHeader(headers, "path-name", d_ds->d_dohPath);
addStaticHeader(headers, "accept-name", "accept-value");
addStaticHeader(headers, "content-type-name", "content-type-value");
addStaticHeader(headers, "user-agent-name", "user-agent-value");
addDynamicHeader(headers, "content-length-name", payloadSize);
/* no need to add these headers for health-check queries */
if (addXForwarded && query.d_idstate.origRemote.getPort() != 0) {
remote = query.d_idstate.origRemote.toString();
remotePort = std::to_string(query.d_idstate.origRemote.getPort());
addDynamicHeader(headers, "x-forwarded-for-name", remote);
addDynamicHeader(headers, "x-forwarded-port-name", remotePort);
if (query.d_idstate.cs != nullptr) {
if (query.d_idstate.cs->isUDP()) {
addStaticHeader(headers, "x-forwarded-proto-name", "x-forwarded-proto-value-dns-over-udp");
}
else if (query.d_idstate.cs->isDoH()) {
if (query.d_idstate.cs->hasTLS()) {
addStaticHeader(headers, "x-forwarded-proto-name", "x-forwarded-proto-value-dns-over-https");
}
else {
addStaticHeader(headers, "x-forwarded-proto-name", "x-forwarded-proto-value-dns-over-http");
}
}
else if (query.d_idstate.cs->hasTLS()) {
addStaticHeader(headers, "x-forwarded-proto-name", "x-forwarded-proto-value-dns-over-tls");
}
else {
addStaticHeader(headers, "x-forwarded-proto-name", "x-forwarded-proto-value-dns-over-tcp");
}
}
}
PendingRequest pending;
pending.d_query = std::move(query);
pending.d_sender = std::move(sender);
uint32_t streamId = nghttp2_session_get_next_stream_id(d_session.get());
auto insertPair = d_currentStreams.insert({streamId, std::move(pending)});
if (!insertPair.second) {
/* there is a stream ID collision, something is very wrong! */
d_connectionDied = true;
nghttp2_session_terminate_session(d_session.get(), NGHTTP2_NO_ERROR);
throw std::runtime_error("Stream ID collision");
}
/* if data_prd is not NULL, it provides data which will be sent in subsequent DATA frames. In this case, a method that allows request message bodies (https://tools.ietf.org/html/rfc7231#section-4) must be specified with :method key (e.g. POST). This function does not take ownership of the data_prd. The function copies the members of the data_prd. If data_prd is NULL, HEADERS have END_STREAM set.
*/
nghttp2_data_provider data_provider;
/* we will not use this pointer */
data_provider.source.ptr = this;
data_provider.read_callback = [](nghttp2_session* session, int32_t stream_id, uint8_t* buf, size_t length, uint32_t* data_flags, nghttp2_data_source* source, void* user_data) -> ssize_t {
auto conn = reinterpret_cast<DoHConnectionToBackend*>(user_data);
auto& request = conn->d_currentStreams.at(stream_id);
size_t toCopy = 0;
if (request.d_queryPos < request.d_query.d_buffer.size()) {
size_t remaining = request.d_query.d_buffer.size() - request.d_queryPos;
toCopy = length > remaining ? remaining : length;
memcpy(buf, &request.d_query.d_buffer.at(request.d_queryPos), toCopy);
request.d_queryPos += toCopy;
}
if (request.d_queryPos >= request.d_query.d_buffer.size()) {
*data_flags |= NGHTTP2_DATA_FLAG_EOF;
}
return toCopy;
};
auto newStreamId = nghttp2_submit_request(d_session.get(), nullptr, headers.data(), headers.size(), &data_provider, this);
if (newStreamId < 0) {
d_connectionDied = true;
++d_ds->tcpDiedSendingQuery;
d_currentStreams.erase(streamId);
throw std::runtime_error("Error submitting HTTP request:" + std::string(nghttp2_strerror(newStreamId)));
}
auto rv = nghttp2_session_send(d_session.get());
if (rv != 0) {
d_connectionDied = true;
++d_ds->tcpDiedSendingQuery;
d_currentStreams.erase(streamId);
throw std::runtime_error("Error in nghttp2_session_send:" + std::to_string(rv));
}
d_highestStreamID = newStreamId;
}
class DoHClientThreadData
{
public:
DoHClientThreadData() :
mplexer(std::unique_ptr<FDMultiplexer>(FDMultiplexer::getMultiplexerSilent()))
{
}
std::unique_ptr<FDMultiplexer> mplexer{nullptr};
};
void DoHConnectionToBackend::handleReadableIOCallback(int fd, FDMultiplexer::funcparam_t& param)
{
auto conn = boost::any_cast<std::shared_ptr<DoHConnectionToBackend>>(param);
if (fd != conn->getHandle()) {
throw std::runtime_error("Unexpected socket descriptor " + std::to_string(fd) + " received in " + std::string(__PRETTY_FUNCTION__) + ", expected " + std::to_string(conn->getHandle()));
}
IOStateGuard ioGuard(conn->d_ioState);
do {
conn->d_inPos = 0;
conn->d_in.resize(conn->d_in.size() + 512);
// cerr<<"trying to read "<<conn->d_in.size()<<endl;
try {
IOState newState = conn->d_handler->tryRead(conn->d_in, conn->d_inPos, conn->d_in.size(), true);
// cerr<<"got a "<<(int)newState<<" state and "<<conn->d_inPos<<" bytes"<<endl;
conn->d_in.resize(conn->d_inPos);
if (conn->d_inPos > 0) {
/* we got something */
auto readlen = nghttp2_session_mem_recv(conn->d_session.get(), conn->d_in.data(), conn->d_inPos);
// cerr<<"nghttp2_session_mem_recv returned "<<readlen<<endl;
/* as long as we don't require a pause by returning nghttp2_error.NGHTTP2_ERR_PAUSE from a CB,
all data should be consumed before returning */
if (readlen > 0 && static_cast<size_t>(readlen) < conn->d_inPos) {
throw std::runtime_error("Fatal error while passing received data to nghttp2: " + std::string(nghttp2_strerror((int)readlen)));
}
struct timeval now;
gettimeofday(&now, nullptr);
conn->d_lastDataReceivedTime = now;
// cerr<<"after read send"<<endl;
nghttp2_session_send(conn->d_session.get());
}
if (newState == IOState::Done) {
if (conn->isIdle()) {
conn->stopIO();
conn->watchForRemoteHostClosingConnection();
ioGuard.release();
break;
}
}
else {
if (newState == IOState::NeedWrite) {
// cerr<<"need write"<<endl;
conn->updateIO(IOState::NeedWrite, handleReadableIOCallback);
}
ioGuard.release();
break;
}
}
catch (const std::exception& e) {
vinfolog("Exception while trying to read from HTTP backend connection: %s", e.what());
++conn->d_ds->tcpDiedReadingResponse;
conn->handleIOError();
break;
}
} while (conn->getConcurrentStreamsCount() > 0);
}
void DoHConnectionToBackend::handleWritableIOCallback(int fd, FDMultiplexer::funcparam_t& param)
{
auto conn = boost::any_cast<std::shared_ptr<DoHConnectionToBackend>>(param);
if (fd != conn->getHandle()) {
throw std::runtime_error("Unexpected socket descriptor " + std::to_string(fd) + " received in " + std::string(__PRETTY_FUNCTION__) + ", expected " + std::to_string(conn->getHandle()));
}
IOStateGuard ioGuard(conn->d_ioState);
// cerr<<"in "<<__PRETTY_FUNCTION__<<" trying to write "<<conn->d_out.size()-conn->d_outPos<<endl;
try {
IOState newState = conn->d_handler->tryWrite(conn->d_out, conn->d_outPos, conn->d_out.size());
// cerr<<"got a "<<(int)newState<<" state, "<<conn->d_out.size()-conn->d_outPos<<" bytes remaining"<<endl;
if (newState == IOState::NeedRead) {
conn->updateIO(IOState::NeedRead, handleWritableIOCallback);
}
else if (newState == IOState::Done) {
// cerr<<"done, buffer size was "<<conn->d_out.size()<<", pos was "<<conn->d_outPos<<endl;
conn->d_firstWrite = false;
conn->d_out.clear();
conn->d_outPos = 0;
conn->stopIO();
if (!conn->isIdle()) {
conn->updateIO(IOState::NeedRead, handleReadableIOCallback);
}
else {
conn->watchForRemoteHostClosingConnection();
}
}
ioGuard.release();
}
catch (const std::exception& e) {
vinfolog("Exception while trying to write (ready) to HTTP backend connection: %s", e.what());
++conn->d_ds->tcpDiedSendingQuery;
conn->handleIOError();
}
}
void DoHConnectionToBackend::stopIO()
{
d_ioState->reset();
auto shared = std::dynamic_pointer_cast<DoHConnectionToBackend>(shared_from_this());
if (!willBeReusable(false)) {
/* remove ourselves from the connection cache, this might mean that our
reference count drops to zero after that, so we need to be careful */
t_downstreamDoHConnectionsManager.removeDownstreamConnection(shared);
}
else {
t_downstreamDoHConnectionsManager.moveToIdle(shared);
}
}
void DoHConnectionToBackend::updateIO(IOState newState, FDMultiplexer::callbackfunc_t callback, bool noTTD)
{
struct timeval now;
gettimeofday(&now, nullptr);
boost::optional<struct timeval> ttd{boost::none};
if (!noTTD) {
if (d_healthCheckQuery) {
ttd = getBackendHealthCheckTTD(now);
}
else if (newState == IOState::NeedRead) {
ttd = getBackendReadTTD(now);
}
else if (isFresh() && d_firstWrite) {
/* first write just after the non-blocking connect */
ttd = getBackendConnectTTD(now);
}
else {
ttd = getBackendWriteTTD(now);
}
}
auto shared = std::dynamic_pointer_cast<DoHConnectionToBackend>(shared_from_this());
if (shared) {
if (newState == IOState::NeedRead) {
d_ioState->update(newState, callback, shared, ttd);
}
else if (newState == IOState::NeedWrite) {
d_ioState->update(newState, callback, shared, ttd);
}
}
}
void DoHConnectionToBackend::watchForRemoteHostClosingConnection()
{
if (willBeReusable(false) && !d_healthCheckQuery) {
updateIO(IOState::NeedRead, handleReadableIOCallback, false);
}
}
void DoHConnectionToBackend::addToIOState(IOState state, FDMultiplexer::callbackfunc_t callback)
{
struct timeval now;
gettimeofday(&now, nullptr);
boost::optional<struct timeval> ttd{boost::none};
if (state == IOState::NeedRead) {
ttd = getBackendReadTTD(now);
}
else if (isFresh() && d_firstWrite == 0) {
/* first write just after the non-blocking connect */
ttd = getBackendConnectTTD(now);
}
else {
ttd = getBackendWriteTTD(now);
}
auto shared = std::dynamic_pointer_cast<DoHConnectionToBackend>(shared_from_this());
if (shared) {
if (state == IOState::NeedRead) {
d_ioState->add(state, callback, shared, ttd);
}
else if (state == IOState::NeedWrite) {
d_ioState->add(state, callback, shared, ttd);
}
}
}
ssize_t DoHConnectionToBackend::send_callback(nghttp2_session* session, const uint8_t* data, size_t length, int flags, void* user_data)
{
DoHConnectionToBackend* conn = reinterpret_cast<DoHConnectionToBackend*>(user_data);
bool bufferWasEmpty = conn->d_out.empty();
if (!conn->d_proxyProtocolPayloadSent && !conn->d_proxyProtocolPayload.empty()) {
conn->d_out.insert(conn->d_out.end(), conn->d_proxyProtocolPayload.begin(), conn->d_proxyProtocolPayload.end());
conn->d_proxyProtocolPayloadSent = true;
}
conn->d_out.insert(conn->d_out.end(), data, data + length);
if (bufferWasEmpty) {
try {
// cerr<<"in "<<__PRETTY_FUNCTION__<<" trying to write "<<conn->d_out.size()-conn->d_outPos<<endl;
auto state = conn->d_handler->tryWrite(conn->d_out, conn->d_outPos, conn->d_out.size());
// cerr<<"got a "<<(int)state<<" state, "<<conn->d_out.size()-conn->d_outPos<<" bytes remaining"<<endl;
if (state == IOState::Done) {
conn->d_firstWrite = false;
conn->d_out.clear();
conn->d_outPos = 0;
conn->stopIO();
if (!conn->isIdle()) {
conn->updateIO(IOState::NeedRead, handleReadableIOCallback);
}
else {
conn->watchForRemoteHostClosingConnection();
}
}
else {
conn->updateIO(state, handleWritableIOCallback);
}
}
catch (const std::exception& e) {
vinfolog("Exception while trying to write (send) to HTTP backend connection: %s", e.what());
conn->handleIOError();
++conn->d_ds->tcpDiedSendingQuery;
}
}
return length;
}
int DoHConnectionToBackend::on_frame_recv_callback(nghttp2_session* session, const nghttp2_frame* frame, void* user_data)
{
DoHConnectionToBackend* conn = reinterpret_cast<DoHConnectionToBackend*>(user_data);
// cerr<<"Frame type is "<<std::to_string(frame->hd.type)<<endl;
#if 0
switch (frame->hd.type) {
case NGHTTP2_HEADERS:
cerr<<"got headers"<<endl;
if (frame->headers.cat == NGHTTP2_HCAT_RESPONSE) {
cerr<<"All headers received"<<endl;
}
break;
case NGHTTP2_WINDOW_UPDATE:
cerr<<"got window update"<<endl;
break;
case NGHTTP2_SETTINGS:
cerr<<"got settings"<<endl;
cerr<<frame->settings.niv<<endl;
for (size_t idx = 0; idx < frame->settings.niv; idx++) {
cerr<<"- "<<frame->settings.iv[idx].settings_id<<" "<<frame->settings.iv[idx].value<<endl;
}
break;
case NGHTTP2_DATA:
cerr<<"got data"<<endl;
break;
}
#endif
if (frame->hd.type == NGHTTP2_GOAWAY) {
conn->d_connectionDied = true;
}
/* is this the last frame for this stream? */
else if ((frame->hd.type == NGHTTP2_HEADERS || frame->hd.type == NGHTTP2_DATA) && frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
auto stream = conn->d_currentStreams.find(frame->hd.stream_id);
if (stream != conn->d_currentStreams.end()) {
// cerr<<"Stream "<<frame->hd.stream_id<<" is now finished"<<endl;
stream->second.d_finished = true;
++conn->d_queries;
auto request = std::move(stream->second);
conn->d_currentStreams.erase(stream->first);
if (request.d_responseCode == 200U) {
conn->handleResponse(std::move(request));
}
else {
vinfolog("HTTP response has a non-200 status code: %d", request.d_responseCode);
struct timeval now;
gettimeofday(&now, nullptr);
conn->handleResponseError(std::move(request), now);
}
if (conn->isIdle()) {
conn->stopIO();
conn->watchForRemoteHostClosingConnection();
}
}
else {
vinfolog("Stream %d NOT FOUND", frame->hd.stream_id);
conn->d_connectionDied = true;
++conn->d_ds->tcpDiedReadingResponse;
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
}
return 0;
}
int DoHConnectionToBackend::on_data_chunk_recv_callback(nghttp2_session* session, uint8_t flags, int32_t stream_id, const uint8_t* data, size_t len, void* user_data)
{
DoHConnectionToBackend* conn = reinterpret_cast<DoHConnectionToBackend*>(user_data);
// cerr<<"Got data of size "<<len<<" for stream "<<stream_id<<endl;
auto stream = conn->d_currentStreams.find(stream_id);
if (stream == conn->d_currentStreams.end()) {
vinfolog("Unable to match the stream ID %d to a known one!", stream_id);
conn->d_connectionDied = true;
++conn->d_ds->tcpDiedReadingResponse;
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
if (len > std::numeric_limits<uint16_t>::max() || (std::numeric_limits<uint16_t>::max() - stream->second.d_buffer.size()) < len) {
vinfolog("Data frame of size %d is too large for a DNS response (we already have %d)", len, stream->second.d_buffer.size());
conn->d_connectionDied = true;
++conn->d_ds->tcpDiedReadingResponse;
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
stream->second.d_buffer.insert(stream->second.d_buffer.end(), data, data + len);
if (stream->second.d_finished) {
// cerr<<"we now have the full response!"<<endl;
// cerr<<std::string(reinterpret_cast<const char*>(data), len)<<endl;
auto request = std::move(stream->second);
conn->d_currentStreams.erase(stream->first);
if (request.d_responseCode == 200U) {
conn->handleResponse(std::move(request));
}
else {
vinfolog("HTTP response has a non-200 status code: %d", request.d_responseCode);
struct timeval now;
gettimeofday(&now, nullptr);
conn->handleResponseError(std::move(request), now);
}
if (conn->isIdle()) {
conn->stopIO();
conn->watchForRemoteHostClosingConnection();
}
}
return 0;
}
int DoHConnectionToBackend::on_stream_close_callback(nghttp2_session* session, int32_t stream_id, uint32_t error_code, void* user_data)
{
DoHConnectionToBackend* conn = reinterpret_cast<DoHConnectionToBackend*>(user_data);
if (error_code == 0) {
return 0;
}
// cerr << "Stream " << stream_id << " closed with error_code=" << error_code << endl;
conn->d_connectionDied = true;
++conn->d_ds->tcpDiedReadingResponse;
auto stream = conn->d_currentStreams.find(stream_id);
if (stream == conn->d_currentStreams.end()) {
/* we don't care, then */
return 0;
}
struct timeval now;
gettimeofday(&now, nullptr);
auto request = std::move(stream->second);
conn->d_currentStreams.erase(stream->first);
// cerr<<"Query has "<<request.d_query.d_downstreamFailures<<" failures, backend limit is "<<conn->d_ds->d_retries<<endl;
if (request.d_query.d_downstreamFailures < conn->d_ds->d_retries) {
// cerr<<"in "<<__PRETTY_FUNCTION__<<", looking for a connection to send a query of size "<<request.d_query.d_buffer.size()<<endl;
++request.d_query.d_downstreamFailures;
auto downstream = t_downstreamDoHConnectionsManager.getConnectionToDownstream(conn->d_mplexer, conn->d_ds, now, std::string(conn->d_proxyProtocolPayload));
downstream->queueQuery(request.d_sender, std::move(request.d_query));
}
else {
conn->handleResponseError(std::move(request), now);
}
//cerr<<"we now have "<<conn->getConcurrentStreamsCount()<<" concurrent connections"<<endl;
if (conn->isIdle()) {
//cerr<<"stopping IO"<<endl;
conn->stopIO();
conn->watchForRemoteHostClosingConnection();
}
return 0;
}
int DoHConnectionToBackend::on_header_callback(nghttp2_session* session, const nghttp2_frame* frame, const uint8_t* name, size_t namelen, const uint8_t* value, size_t valuelen, uint8_t flags, void* user_data)
{
DoHConnectionToBackend* conn = reinterpret_cast<DoHConnectionToBackend*>(user_data);
const std::string status(":status");
if (frame->hd.type == NGHTTP2_HEADERS && frame->headers.cat == NGHTTP2_HCAT_RESPONSE) {
//cerr<<"got header for "<<frame->hd.stream_id<<":"<<endl;
//cerr<<"- "<<std::string(reinterpret_cast<const char*>(name), namelen)<<endl;
//cerr<<"- "<<std::string(reinterpret_cast<const char*>(value), valuelen)<<endl;
if (namelen == status.size() && memcmp(status.data(), name, status.size()) == 0) {
auto stream = conn->d_currentStreams.find(frame->hd.stream_id);
if (stream == conn->d_currentStreams.end()) {
vinfolog("Unable to match the stream ID %d to a known one!", frame->hd.stream_id);
conn->d_connectionDied = true;
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
try {
stream->second.d_responseCode = pdns_stou(std::string(reinterpret_cast<const char*>(value), valuelen));
}
catch (...) {
vinfolog("Error parsing the status header for stream ID %d", frame->hd.stream_id);
conn->d_connectionDied = true;
++conn->d_ds->tcpDiedReadingResponse;
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
}
}
return 0;
}
int DoHConnectionToBackend::on_error_callback(nghttp2_session* session, int lib_error_code, const char* msg, size_t len, void* user_data)
{
vinfolog("Error in HTTP/2 connection: %s", std::string(msg, len));
DoHConnectionToBackend* conn = reinterpret_cast<DoHConnectionToBackend*>(user_data);
conn->d_connectionDied = true;
++conn->d_ds->tcpDiedReadingResponse;
return 0;
}
DoHConnectionToBackend::DoHConnectionToBackend(const std::shared_ptr<DownstreamState>& ds, std::unique_ptr<FDMultiplexer>& mplexer, const struct timeval& now, std::string&& proxyProtocolPayload) :
ConnectionToBackend(ds, mplexer, now), d_proxyProtocolPayload(std::move(proxyProtocolPayload))
{
// inherit most of the stuff from the ConnectionToBackend()
d_ioState = make_unique<IOStateHandler>(*d_mplexer, d_handler->getDescriptor());
nghttp2_session_callbacks* cbs = nullptr;
if (nghttp2_session_callbacks_new(&cbs) != 0) {
d_connectionDied = true;
++d_ds->tcpDiedSendingQuery;
vinfolog("Unable to create a callback object for a new HTTP/2 session");
return;
}
std::unique_ptr<nghttp2_session_callbacks, void (*)(nghttp2_session_callbacks*)> callbacks(cbs, nghttp2_session_callbacks_del);
cbs = nullptr;
nghttp2_session_callbacks_set_send_callback(callbacks.get(), send_callback);
nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks.get(), on_frame_recv_callback);
nghttp2_session_callbacks_set_on_data_chunk_recv_callback(callbacks.get(), on_data_chunk_recv_callback);
nghttp2_session_callbacks_set_on_stream_close_callback(callbacks.get(), on_stream_close_callback);
nghttp2_session_callbacks_set_on_header_callback(callbacks.get(), on_header_callback);
nghttp2_session_callbacks_set_error_callback2(callbacks.get(), on_error_callback);
nghttp2_session* sess = nullptr;
if (nghttp2_session_client_new(&sess, callbacks.get(), this) != 0) {
d_connectionDied = true;
++d_ds->tcpDiedSendingQuery;
vinfolog("Coult not allocate a new HTTP/2 session");
return;
}
d_session = std::unique_ptr<nghttp2_session, void (*)(nghttp2_session*)>(sess, nghttp2_session_del);
sess = nullptr;
callbacks.reset();
nghttp2_settings_entry iv[] = {
/* rfc7540 section-8.2.2:
"Advertising a SETTINGS_MAX_CONCURRENT_STREAMS value of zero disables
server push by preventing the server from creating the necessary
streams."
*/
{NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 0},
{NGHTTP2_SETTINGS_ENABLE_PUSH, 0},
/* we might want to make the initial window size configurable, but 16M is a large enough default */
{NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE, 16 * 1024 * 1024}};
/* client 24 bytes magic string will be sent by nghttp2 library */
int rv = nghttp2_submit_settings(d_session.get(), NGHTTP2_FLAG_NONE, iv, sizeof(iv) / sizeof(*iv));
if (rv != 0) {
d_connectionDied = true;
++d_ds->tcpDiedSendingQuery;
vinfolog("Could not submit SETTINGS: %s", nghttp2_strerror(rv));
return;
}
}
static void handleCrossProtocolQuery(int pipefd, FDMultiplexer::funcparam_t& param)
{
auto threadData = boost::any_cast<DoHClientThreadData*>(param);
CrossProtocolQuery* tmp{nullptr};
ssize_t got = read(pipefd, &tmp, sizeof(tmp));
if (got == 0) {
throw std::runtime_error("EOF while reading from the DoH cross-protocol pipe (" + std::to_string(pipefd) + ") in " + std::string(isNonBlocking(pipefd) ? "non-blocking" : "blocking") + " mode");
}
else if (got == -1) {
if (errno == EAGAIN || errno == EINTR) {
return;
}
throw std::runtime_error("Error while reading from the DoH cross-protocol pipe (" + std::to_string(pipefd) + ") in " + std::string(isNonBlocking(pipefd) ? "non-blocking" : "blocking") + " mode:" + stringerror());
}
else if (got != sizeof(tmp)) {
throw std::runtime_error("Partial read while reading from the DoH cross-protocol pipe (" + std::to_string(pipefd) + ") in " + std::string(isNonBlocking(pipefd) ? "non-blocking" : "blocking") + " mode");
}
try {
struct timeval now;
gettimeofday(&now, nullptr);
std::shared_ptr<TCPQuerySender> tqs = tmp->getTCPQuerySender();
auto query = std::move(tmp->query);
auto downstreamServer = std::move(tmp->downstream);
delete tmp;
tmp = nullptr;
try {
auto downstream = t_downstreamDoHConnectionsManager.getConnectionToDownstream(threadData->mplexer, downstreamServer, now, std::move(query.d_proxyProtocolPayload));
downstream->queueQuery(tqs, std::move(query));
}
catch (...) {
tqs->notifyIOError(std::move(query.d_idstate), now);
}
}
catch (...) {
delete tmp;
tmp = nullptr;
}
}
static void dohClientThread(int crossProtocolPipeFD)
{
setThreadName("dnsdist/dohClie");
try {
DoHClientThreadData data;
data.mplexer->addReadFD(crossProtocolPipeFD, handleCrossProtocolQuery, &data);
struct timeval now;
gettimeofday(&now, nullptr);
time_t lastTimeoutScan = now.tv_sec;
for (;;) {
data.mplexer->run(&now);
if (now.tv_sec > lastTimeoutScan) {
lastTimeoutScan = now.tv_sec;
try {
t_downstreamDoHConnectionsManager.cleanupClosedConnections(now);
handleH2Timeouts(*data.mplexer, now);
if (g_dohStatesDumpRequested > 0) {
/* just to keep things clean in the output, debug only */
static std::mutex s_lock;
std::lock_guard<decltype(s_lock)> lck(s_lock);
if (g_dohStatesDumpRequested > 0) {
/* no race here, we took the lock so it can only be increased in the meantime */
--g_dohStatesDumpRequested;
errlog("Dumping the DoH client states, as requested:");
data.mplexer->runForAllWatchedFDs([](bool isRead, int fd, const FDMultiplexer::funcparam_t& param, struct timeval ttd) {
struct timeval lnow;
gettimeofday(&lnow, nullptr);
if (ttd.tv_sec > 0) {
errlog("- Descriptor %d is in %s state, TTD in %d", fd, (isRead ? "read" : "write"), (ttd.tv_sec - lnow.tv_sec));
}
else {
errlog("- Descriptor %d is in %s state, no TTD set", fd, (isRead ? "read" : "write"));
}
if (param.type() == typeid(std::shared_ptr<DoHConnectionToBackend>)) {
auto conn = boost::any_cast<std::shared_ptr<DoHConnectionToBackend>>(param);
errlog(" - %s", conn->toString());
}
else if (param.type() == typeid(DoHClientThreadData*)) {
errlog(" - Worker thread pipe");
}
});
errlog("The DoH client cache has %d active and %d idle outgoing connections cached", t_downstreamDoHConnectionsManager.getActiveCount(), t_downstreamDoHConnectionsManager.getIdleCount());
}
}
}
catch (const std::exception& e) {
errlog("Error in outgoing DoH thread: %s", e.what());
}
}
}
}
catch (const std::exception& e) {
errlog("Fatal error in outgoing DoH thread: %s", e.what());
}
}
static bool select_next_proto_callback(unsigned char** out, unsigned char* outlen, const unsigned char* in, unsigned int inlen)
{
if (nghttp2_select_next_protocol(out, outlen, in, inlen) <= 0) {
vinfolog("The remote DoH backend did not advertise " NGHTTP2_PROTO_VERSION_ID);
return false;
}
return true;
}
#endif /* HAVE_NGHTTP2 */
struct DoHClientCollection::DoHWorkerThread
{
DoHWorkerThread()
{
}
DoHWorkerThread(int crossProtocolPipe) :
d_crossProtocolQueryPipe(crossProtocolPipe)
{
}
DoHWorkerThread(DoHWorkerThread&& rhs) :
d_crossProtocolQueryPipe(rhs.d_crossProtocolQueryPipe)
{
rhs.d_crossProtocolQueryPipe = -1;
}
DoHWorkerThread& operator=(DoHWorkerThread&& rhs)
{
if (d_crossProtocolQueryPipe != -1) {
close(d_crossProtocolQueryPipe);
}
d_crossProtocolQueryPipe = rhs.d_crossProtocolQueryPipe;
rhs.d_crossProtocolQueryPipe = -1;
return *this;
}
DoHWorkerThread(const DoHWorkerThread& rhs) = delete;
DoHWorkerThread& operator=(const DoHWorkerThread&) = delete;
~DoHWorkerThread()
{
if (d_crossProtocolQueryPipe != -1) {
close(d_crossProtocolQueryPipe);
}
}
int d_crossProtocolQueryPipe{-1};
};
DoHClientCollection::DoHClientCollection(size_t numberOfThreads) :
d_clientThreads(numberOfThreads)
{
}
bool DoHClientCollection::passCrossProtocolQueryToThread(std::unique_ptr<CrossProtocolQuery>&& cpq)
{
if (d_numberOfThreads == 0) {
throw std::runtime_error("No DoH worker thread yet");
}
uint64_t pos = d_pos++;
auto pipe = d_clientThreads.at(pos % d_numberOfThreads).d_crossProtocolQueryPipe;
auto tmp = cpq.release();
if (write(pipe, &tmp, sizeof(tmp)) != sizeof(tmp)) {
delete tmp;
++g_stats.outgoingDoHQueryPipeFull;
tmp = nullptr;
return false;
}
return true;
}
void DoHClientCollection::addThread()
{
#ifdef HAVE_NGHTTP2
auto preparePipe = [](int fds[2], const std::string& type) -> bool {
if (pipe(fds) < 0) {
errlog("Error creating the DoH thread %s pipe: %s", type, stringerror());
return false;
}
if (!setNonBlocking(fds[0])) {
int err = errno;
close(fds[0]);
close(fds[1]);
errlog("Error setting the DoH thread %s pipe non-blocking: %s", type, stringerror(err));
return false;
}
if (!setNonBlocking(fds[1])) {
int err = errno;
close(fds[0]);
close(fds[1]);
errlog("Error setting the DoH thread %s pipe non-blocking: %s", type, stringerror(err));
return false;
}
if (g_tcpInternalPipeBufferSize > 0 && getPipeBufferSize(fds[0]) < g_tcpInternalPipeBufferSize) {
setPipeBufferSize(fds[0], g_tcpInternalPipeBufferSize);
}
return true;
};
int crossProtocolFDs[2] = {-1, -1};
if (!preparePipe(crossProtocolFDs, "cross-protocol")) {
return;
}
vinfolog("Adding DoH Client thread");
{
std::lock_guard<std::mutex> lock(d_mutex);
if (d_numberOfThreads >= d_clientThreads.size()) {
vinfolog("Adding a new DoH client thread would exceed the vector size (%d/%d), skipping. Consider increasing the maximum amount of DoH client threads with setMaxDoHClientThreads() in the configuration.", d_numberOfThreads, d_clientThreads.size());
close(crossProtocolFDs[0]);
close(crossProtocolFDs[1]);
return;
}
/* from now on this side of the pipe will be managed by that object,
no need to worry about it */
DoHWorkerThread worker(crossProtocolFDs[1]);
try {
std::thread t1(dohClientThread, crossProtocolFDs[0]);
t1.detach();
}
catch (const std::runtime_error& e) {
/* the thread creation failed, don't leak */
errlog("Error creating a DoH thread: %s", e.what());
close(crossProtocolFDs[0]);
return;
}
d_clientThreads.at(d_numberOfThreads) = std::move(worker);
++d_numberOfThreads;
}
#else /* HAVE_NGHTTP2 */
throw std::runtime_error("DoHClientCollection::addThread() called but nghttp2 support is not available");
#endif /* HAVE_NGHTTP2 */
}
bool initDoHWorkers()
{
#ifdef HAVE_NGHTTP2
if (!g_outgoingDoHWorkerThreads) {
/* Unless the value has been set to 0 explicitly, always start at least one outgoing DoH worker thread, in case a DoH backend
is added at a later time. */
g_outgoingDoHWorkerThreads = 1;
}
if (g_outgoingDoHWorkerThreads && *g_outgoingDoHWorkerThreads > 0) {
g_dohClientThreads = std::make_unique<DoHClientCollection>(*g_outgoingDoHWorkerThreads);
for (size_t idx = 0; idx < *g_outgoingDoHWorkerThreads; idx++) {
g_dohClientThreads->addThread();
}
}
return true;
#else
return false;
#endif /* HAVE_NGHTTP2 */
}
bool setupDoHClientProtocolNegotiation(std::shared_ptr<TLSCtx>& ctx)
{
if (ctx == nullptr) {
return false;
}
#ifdef HAVE_NGHTTP2
/* we want to set the ALPN to h2, if only to mitigate the ALPACA attack */
const std::vector<std::vector<uint8_t>> h2Alpns = {{'h', '2'}};
ctx->setALPNProtos(h2Alpns);
ctx->setNextProtocolSelectCallback(select_next_proto_callback);
return true;
#else /* HAVE_NGHTTP2 */
return false;
#endif /* HAVE_NGHTTP2 */
}
bool sendH2Query(const std::shared_ptr<DownstreamState>& ds, std::unique_ptr<FDMultiplexer>& mplexer, std::shared_ptr<TCPQuerySender>& sender, InternalQuery&& query, bool healthCheck)
{
#ifdef HAVE_NGHTTP2
struct timeval now;
gettimeofday(&now, nullptr);
if (healthCheck) {
/* always do health-checks over a new connection */
auto newConnection = std::make_shared<DoHConnectionToBackend>(ds, mplexer, now, std::move(query.d_proxyProtocolPayload));
newConnection->setHealthCheck(healthCheck);
newConnection->queueQuery(sender, std::move(query));
}
else {
auto connection = t_downstreamDoHConnectionsManager.getConnectionToDownstream(mplexer, ds, now, std::move(query.d_proxyProtocolPayload));
connection->queueQuery(sender, std::move(query));
}
return true;
#else /* HAVE_NGHTTP2 */
return false;
#endif /* HAVE_NGHTTP2 */
}
size_t clearH2Connections()
{
size_t cleared = 0;
#ifdef HAVE_NGHTTP2
cleared = t_downstreamDoHConnectionsManager.clear();
#endif /* HAVE_NGHTTP2 */
return cleared;
}
size_t handleH2Timeouts(FDMultiplexer& mplexer, const struct timeval& now)
{
size_t got = 0;
#ifdef HAVE_NGHTTP2
auto expiredReadConns = mplexer.getTimeouts(now, false);
for (const auto& cbData : expiredReadConns) {
if (cbData.second.type() == typeid(std::shared_ptr<DoHConnectionToBackend>)) {
auto conn = boost::any_cast<std::shared_ptr<DoHConnectionToBackend>>(cbData.second);
vinfolog("Timeout (read) from remote DoH backend %s", conn->getBackendName());
conn->handleTimeout(now, false);
++got;
}
}
auto expiredWriteConns = mplexer.getTimeouts(now, true);
for (const auto& cbData : expiredWriteConns) {
if (cbData.second.type() == typeid(std::shared_ptr<DoHConnectionToBackend>)) {
auto conn = boost::any_cast<std::shared_ptr<DoHConnectionToBackend>>(cbData.second);
vinfolog("Timeout (write) from remote DoH backend %s", conn->getBackendName());
conn->handleTimeout(now, true);
++got;
}
}
#endif /* HAVE_NGHTTP2 */
return got;
}
void setDoHDownstreamCleanupInterval(uint16_t max)
{
#ifdef HAVE_NGHTTP2
DownstreamDoHConnectionsManager::setCleanupInterval(max);
#endif /* HAVE_NGHTTP2 */
}
void setDoHDownstreamMaxIdleTime(uint16_t max)
{
#ifdef HAVE_NGHTTP2
DownstreamDoHConnectionsManager::setMaxIdleTime(max);
#endif /* HAVE_NGHTTP2 */
}
void setDoHDownstreamMaxIdleConnectionsPerBackend(size_t max)
{
#ifdef HAVE_NGHTTP2
DownstreamDoHConnectionsManager::setMaxIdleConnectionsPerDownstream(max);
#endif /* HAVE_NGHTTP2 */
}
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