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FwdState.cc
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FwdState.cc
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/*
* Copyright (C) 1996-2018 The Squid Software Foundation and contributors
*
* Squid software is distributed under GPLv2+ license and includes
* contributions from numerous individuals and organizations.
* Please see the COPYING and CONTRIBUTORS files for details.
*/
/* DEBUG: section 17 Request Forwarding */
#include "squid.h"
#include "AccessLogEntry.h"
#include "acl/AclAddress.h"
#include "acl/FilledChecklist.h"
#include "acl/Gadgets.h"
#include "anyp/PortCfg.h"
#include "CacheManager.h"
#include "CachePeer.h"
#include "client_side.h"
#include "clients/forward.h"
#include "comm/Connection.h"
#include "comm/ConnOpener.h"
#include "comm/Loops.h"
#include "CommCalls.h"
#include "errorpage.h"
#include "event.h"
#include "fd.h"
#include "fde.h"
#include "FwdState.h"
#include "globals.h"
#include "gopher.h"
#include "hier_code.h"
#include "http.h"
#include "HttpReply.h"
#include "HttpRequest.h"
#include "icmp/net_db.h"
#include "internal.h"
#include "ip/Intercept.h"
#include "ip/QosConfig.h"
#include "ip/tools.h"
#include "MemObject.h"
#include "mgr/Registration.h"
#include "neighbors.h"
#include "pconn.h"
#include "PeerPoolMgr.h"
#include "PeerSelectState.h"
#include "SquidConfig.h"
#include "SquidTime.h"
#include "Store.h"
#include "StoreClient.h"
#include "urn.h"
#include "whois.h"
#if USE_OPENSSL
#include "ssl/cert_validate_message.h"
#include "ssl/Config.h"
#include "ssl/ErrorDetail.h"
#include "ssl/helper.h"
#include "ssl/PeerConnector.h"
#include "ssl/ServerBump.h"
#include "ssl/support.h"
#endif
#include <cerrno>
static PSC fwdPeerSelectionCompleteWrapper;
static CLCB fwdServerClosedWrapper;
static CNCB fwdConnectDoneWrapper;
static OBJH fwdStats;
#define MAX_FWD_STATS_IDX 9
static int FwdReplyCodes[MAX_FWD_STATS_IDX + 1][Http::scInvalidHeader + 1];
static PconnPool *fwdPconnPool = new PconnPool("server-peers", NULL);
CBDATA_CLASS_INIT(FwdState);
#if USE_OPENSSL
class FwdStatePeerAnswerDialer: public CallDialer, public Ssl::PeerConnector::CbDialer
{
public:
typedef void (FwdState::*Method)(Ssl::PeerConnectorAnswer &);
FwdStatePeerAnswerDialer(Method method, FwdState *fwd):
method_(method), fwd_(fwd), answer_() {}
/* CallDialer API */
virtual bool canDial(AsyncCall &call) { return fwd_.valid(); }
void dial(AsyncCall &call) { ((&(*fwd_))->*method_)(answer_); }
virtual void print(std::ostream &os) const {
os << '(' << fwd_.get() << ", " << answer_ << ')';
}
/* Ssl::PeerConnector::CbDialer API */
virtual Ssl::PeerConnectorAnswer &answer() { return answer_; }
private:
Method method_;
CbcPointer<FwdState> fwd_;
Ssl::PeerConnectorAnswer answer_;
};
#endif
void
FwdState::abort(void* d)
{
FwdState* fwd = (FwdState*)d;
Pointer tmp = fwd; // Grab a temporary pointer to keep the object alive during our scope.
if (Comm::IsConnOpen(fwd->serverConnection())) {
fwd->closeServerConnection("store entry aborted");
} else {
debugs(17, 7, HERE << "store entry aborted; no connection to close");
}
fwd->serverDestinations.clear();
fwd->self = NULL;
}
void
FwdState::closeServerConnection(const char *reason)
{
debugs(17, 3, "because " << reason << "; " << serverConn);
comm_remove_close_handler(serverConn->fd, closeHandler);
closeHandler = NULL;
fwdPconnPool->noteUses(fd_table[serverConn->fd].pconn.uses);
serverConn->close();
}
/**** PUBLIC INTERFACE ********************************************************/
FwdState::FwdState(const Comm::ConnectionPointer &client, StoreEntry * e, HttpRequest * r, const AccessLogEntryPointer &alp):
al(alp)
{
debugs(17, 2, HERE << "Forwarding client request " << client << ", url=" << e->url() );
entry = e;
clientConn = client;
request = r;
HTTPMSGLOCK(request);
pconnRace = raceImpossible;
start_t = squid_curtime;
serverDestinations.reserve(Config.forward_max_tries);
e->lock("FwdState");
EBIT_SET(e->flags, ENTRY_FWD_HDR_WAIT);
}
// Called once, right after object creation, when it is safe to set self
void FwdState::start(Pointer aSelf)
{
// Protect ourselves from being destroyed when the only Server pointing
// to us is gone (while we expect to talk to more Servers later).
// Once we set self, we are responsible for clearing it when we do not
// expect to talk to any servers.
self = aSelf; // refcounted
// We hope that either the store entry aborts or peer is selected.
// Otherwise we are going to leak our object.
// Ftp::Relay needs to preserve control connection on data aborts
// so it registers its own abort handler that calls ours when needed.
if (!request->flags.ftpNative)
entry->registerAbort(FwdState::abort, this);
#if STRICT_ORIGINAL_DST
// Bug 3243: CVE 2009-0801
// Bypass of browser same-origin access control in intercepted communication
// To resolve this we must force DIRECT and only to the original client destination.
const bool isIntercepted = request && !request->flags.redirected && (request->flags.intercepted || request->flags.interceptTproxy);
const bool useOriginalDst = Config.onoff.client_dst_passthru || (request && !request->flags.hostVerified);
if (isIntercepted && useOriginalDst) {
selectPeerForIntercepted();
// 3.2 does not suppro re-wrapping inside CONNECT.
// our only alternative is to fake destination "found" and continue with the forwarding.
startConnectionOrFail();
return;
}
#endif
// do full route options selection
peerSelect(&serverDestinations, request, al, entry, fwdPeerSelectionCompleteWrapper, this);
}
#if STRICT_ORIGINAL_DST
/// bypasses peerSelect() when dealing with intercepted requests
void
FwdState::selectPeerForIntercepted()
{
// use pinned connection if available
Comm::ConnectionPointer p;
if (ConnStateData *client = request->pinnedConnection()) {
p = client->validatePinnedConnection(request, NULL);
if (Comm::IsConnOpen(p)) {
/* duplicate peerSelectPinned() effects */
p->peerType = PINNED;
entry->ping_status = PING_DONE; /* Skip ICP */
debugs(17, 3, "reusing a pinned conn: " << *p);
serverDestinations.push_back(p);
} else {
debugs(17,2, "Pinned connection is not valid: " << p);
ErrorState *anErr = new ErrorState(ERR_ZERO_SIZE_OBJECT, Http::scServiceUnavailable, request);
fail(anErr);
}
// Either use the valid pinned connection or fail if it is invalid.
return;
}
// use client original destination as second preferred choice
p = new Comm::Connection();
p->peerType = ORIGINAL_DST;
p->remote = clientConn->local;
getOutgoingAddress(request, p);
debugs(17, 3, HERE << "using client original destination: " << *p);
serverDestinations.push_back(p);
}
#endif
void
FwdState::completed()
{
if (flags.forward_completed) {
debugs(17, DBG_IMPORTANT, HERE << "FwdState::completed called on a completed request! Bad!");
return;
}
flags.forward_completed = true;
request->hier.stopPeerClock(false);
if (EBIT_TEST(entry->flags, ENTRY_ABORTED)) {
debugs(17, 3, HERE << "entry aborted");
return ;
}
#if URL_CHECKSUM_DEBUG
entry->mem_obj->checkUrlChecksum();
#endif
if (entry->store_status == STORE_PENDING) {
if (entry->isEmpty()) {
if (!err) // we quit (e.g., fd closed) before an error or content
fail(new ErrorState(ERR_READ_ERROR, Http::scBadGateway, request));
assert(err);
errorAppendEntry(entry, err);
err = NULL;
#if USE_OPENSSL
if (request->flags.sslPeek && request->clientConnectionManager.valid()) {
CallJobHere1(17, 4, request->clientConnectionManager, ConnStateData,
ConnStateData::httpsPeeked, ConnStateData::PinnedIdleContext(Comm::ConnectionPointer(nullptr), request));
}
#endif
} else {
EBIT_CLR(entry->flags, ENTRY_FWD_HDR_WAIT);
entry->complete();
entry->releaseRequest();
}
}
if (storePendingNClients(entry) > 0)
assert(!EBIT_TEST(entry->flags, ENTRY_FWD_HDR_WAIT));
}
FwdState::~FwdState()
{
debugs(17, 3, HERE << "FwdState destructor starting");
if (! flags.forward_completed)
completed();
doneWithRetries();
HTTPMSGUNLOCK(request);
delete err;
entry->unregisterAbort();
entry->unlock("FwdState");
entry = NULL;
if (calls.connector != NULL) {
calls.connector->cancel("FwdState destructed");
calls.connector = NULL;
}
if (Comm::IsConnOpen(serverConn))
closeServerConnection("~FwdState");
serverDestinations.clear();
debugs(17, 3, HERE << "FwdState destructor done");
}
/**
* This is the entry point for client-side to start forwarding
* a transaction. It is a static method that may or may not
* allocate a FwdState.
*/
void
FwdState::Start(const Comm::ConnectionPointer &clientConn, StoreEntry *entry, HttpRequest *request, const AccessLogEntryPointer &al)
{
/** \note
* client_addr == no_addr indicates this is an "internal" request
* from peer_digest.c, asn.c, netdb.c, etc and should always
* be allowed. yuck, I know.
*/
if ( Config.accessList.miss && !request->client_addr.isNoAddr() &&
!request->flags.internal && request->url.getScheme() != AnyP::PROTO_CACHE_OBJECT) {
/**
* Check if this host is allowed to fetch MISSES from us (miss_access).
* Intentionally replace the src_addr automatically selected by the checklist code
* we do NOT want the indirect client address to be tested here.
*/
ACLFilledChecklist ch(Config.accessList.miss, request, NULL);
ch.src_addr = request->client_addr;
if (ch.fastCheck() == ACCESS_DENIED) {
err_type page_id;
page_id = aclGetDenyInfoPage(&Config.denyInfoList, AclMatchedName, 1);
if (page_id == ERR_NONE)
page_id = ERR_FORWARDING_DENIED;
ErrorState *anErr = new ErrorState(page_id, Http::scForbidden, request);
errorAppendEntry(entry, anErr); // frees anErr
return;
}
}
debugs(17, 3, HERE << "'" << entry->url() << "'");
/*
* This seems like an odd place to bind mem_obj and request.
* Might want to assert that request is NULL at this point
*/
entry->mem_obj->request = request;
HTTPMSGLOCK(entry->mem_obj->request);
#if URL_CHECKSUM_DEBUG
entry->mem_obj->checkUrlChecksum();
#endif
if (shutting_down) {
/* more yuck */
ErrorState *anErr = new ErrorState(ERR_SHUTTING_DOWN, Http::scServiceUnavailable, request);
errorAppendEntry(entry, anErr); // frees anErr
return;
}
if (request->flags.internal) {
debugs(17, 2, "calling internalStart() due to request flag");
internalStart(clientConn, request, entry);
return;
}
switch (request->url.getScheme()) {
case AnyP::PROTO_CACHE_OBJECT:
debugs(17, 2, "calling CacheManager due to request scheme " << request->url.getScheme());
CacheManager::GetInstance()->Start(clientConn, request, entry);
return;
case AnyP::PROTO_URN:
urnStart(request, entry);
return;
default:
FwdState::Pointer fwd = new FwdState(clientConn, entry, request, al);
fwd->start(fwd);
return;
}
/* NOTREACHED */
}
void
FwdState::fwdStart(const Comm::ConnectionPointer &clientConn, StoreEntry *entry, HttpRequest *request)
{
// Hides AccessLogEntry.h from code that does not supply ALE anyway.
Start(clientConn, entry, request, NULL);
}
void
FwdState::startConnectionOrFail()
{
debugs(17, 3, HERE << entry->url());
if (serverDestinations.size() > 0) {
// Ditch error page if it was created before.
// A new one will be created if there's another problem
delete err;
err = NULL;
// Update the logging information about this new server connection.
// Done here before anything else so the errors get logged for
// this server link regardless of what happens when connecting to it.
// IF sucessfuly connected this top destination will become the serverConnection().
request->hier.note(serverDestinations[0], request->GetHost());
request->clearError();
connectStart();
} else {
debugs(17, 3, HERE << "Connection failed: " << entry->url());
if (!err) {
ErrorState *anErr = new ErrorState(ERR_CANNOT_FORWARD, Http::scInternalServerError, request);
fail(anErr);
} // else use actual error from last connection attempt
self = NULL; // refcounted
}
}
void
FwdState::fail(ErrorState * errorState)
{
debugs(17, 3, err_type_str[errorState->type] << " \"" << Http::StatusCodeString(errorState->httpStatus) << "\"\n\t" << entry->url());
delete err;
err = errorState;
if (!errorState->request) {
errorState->request = request;
HTTPMSGLOCK(errorState->request);
}
if (err->type != ERR_ZERO_SIZE_OBJECT)
return;
if (pconnRace == racePossible) {
debugs(17, 5, HERE << "pconn race happened");
pconnRace = raceHappened;
}
if (ConnStateData *pinned_connection = request->pinnedConnection()) {
pinned_connection->pinning.zeroReply = true;
flags.dont_retry = true; // we want to propagate failure to the client
debugs(17, 4, "zero reply on pinned connection");
}
}
/**
* Frees fwdState without closing FD or generating an abort
*/
void
FwdState::unregister(Comm::ConnectionPointer &conn)
{
debugs(17, 3, HERE << entry->url() );
assert(serverConnection() == conn);
assert(Comm::IsConnOpen(conn));
comm_remove_close_handler(conn->fd, closeHandler);
closeHandler = NULL;
serverConn = NULL;
}
// \deprecated use unregister(Comm::ConnectionPointer &conn) instead
void
FwdState::unregister(int fd)
{
debugs(17, 3, HERE << entry->url() );
assert(fd == serverConnection()->fd);
unregister(serverConn);
}
/**
* FooClient modules call fwdComplete() when they are done
* downloading an object. Then, we either 1) re-forward the
* request somewhere else if needed, or 2) call storeComplete()
* to finish it off
*/
void
FwdState::complete()
{
debugs(17, 3, HERE << entry->url() << "\n\tstatus " << entry->getReply()->sline.status());
#if URL_CHECKSUM_DEBUG
entry->mem_obj->checkUrlChecksum();
#endif
logReplyStatus(n_tries, entry->getReply()->sline.status());
if (reforward()) {
debugs(17, 3, HERE << "re-forwarding " << entry->getReply()->sline.status() << " " << entry->url());
if (Comm::IsConnOpen(serverConn))
unregister(serverConn);
entry->reset();
// drop the last path off the selection list. try the next one.
serverDestinations.erase(serverDestinations.begin());
startConnectionOrFail();
} else {
if (Comm::IsConnOpen(serverConn))
debugs(17, 3, HERE << "server FD " << serverConnection()->fd << " not re-forwarding status " << entry->getReply()->sline.status());
else
debugs(17, 3, HERE << "server (FD closed) not re-forwarding status " << entry->getReply()->sline.status());
EBIT_CLR(entry->flags, ENTRY_FWD_HDR_WAIT);
entry->complete();
if (!Comm::IsConnOpen(serverConn))
completed();
self = NULL; // refcounted
}
}
/**** CALLBACK WRAPPERS ************************************************************/
static void
fwdPeerSelectionCompleteWrapper(Comm::ConnectionList * unused, ErrorState *err, void *data)
{
FwdState *fwd = (FwdState *) data;
if (err)
fwd->fail(err);
fwd->startConnectionOrFail();
}
static void
fwdServerClosedWrapper(const CommCloseCbParams ¶ms)
{
FwdState *fwd = (FwdState *)params.data;
fwd->serverClosed(params.fd);
}
void
fwdConnectDoneWrapper(const Comm::ConnectionPointer &conn, Comm::Flag status, int xerrno, void *data)
{
FwdState *fwd = (FwdState *) data;
fwd->connectDone(conn, status, xerrno);
}
/**** PRIVATE *****************************************************************/
/*
* FwdState::checkRetry
*
* Return TRUE if the request SHOULD be retried. This method is
* called when the HTTP connection fails, or when the connection
* is closed before reading the end of HTTP headers from the server.
*/
bool
FwdState::checkRetry()
{
if (shutting_down)
return false;
if (!self) { // we have aborted before the server called us back
debugs(17, 5, HERE << "not retrying because of earlier abort");
// we will be destroyed when the server clears its Pointer to us
return false;
}
if (entry->store_status != STORE_PENDING)
return false;
if (!entry->isEmpty())
return false;
if (n_tries > Config.forward_max_tries)
return false;
if (squid_curtime - start_t > Config.Timeout.forward)
return false;
if (flags.dont_retry)
return false;
if (request->bodyNibbled())
return false;
// NP: not yet actually connected anywhere. retry is safe.
if (!flags.connected_okay)
return true;
if (!checkRetriable())
return false;
return true;
}
/*
* FwdState::checkRetriable
*
* Return TRUE if this is the kind of request that can be retried
* after a failure. If the request is not retriable then we don't
* want to risk sending it on a persistent connection. Instead we'll
* force it to go on a new HTTP connection.
*/
bool
FwdState::checkRetriable()
{
// Optimize: A compliant proxy may retry PUTs, but Squid lacks the [rather
// complicated] code required to protect the PUT request body from being
// nibbled during the first try. Thus, Squid cannot retry some PUTs today.
if (request->body_pipe != NULL)
return false;
// RFC2616 9.1 Safe and Idempotent Methods
return (request->method.isHttpSafe() || request->method.isIdempotent());
}
void
FwdState::serverClosed(int fd)
{
// XXX: fd is often -1 here
debugs(17, 2, "FD " << fd << " " << entry->url() << " after " <<
(fd >= 0 ? fd_table[fd].pconn.uses : -1) << " requests");
if (fd >= 0 && serverConnection()->fd == fd)
fwdPconnPool->noteUses(fd_table[fd].pconn.uses);
retryOrBail();
}
void
FwdState::retryOrBail()
{
if (checkRetry()) {
debugs(17, 3, HERE << "re-forwarding (" << n_tries << " tries, " << (squid_curtime - start_t) << " secs)");
// we should retry the same destination if it failed due to pconn race
if (pconnRace == raceHappened)
debugs(17, 4, HERE << "retrying the same destination");
else
serverDestinations.erase(serverDestinations.begin()); // last one failed. try another.
startConnectionOrFail();
return;
}
// TODO: should we call completed() here and move doneWithRetries there?
doneWithRetries();
request->hier.stopPeerClock(false);
if (self != NULL && !err && shutting_down && entry->isEmpty()) {
ErrorState *anErr = new ErrorState(ERR_SHUTTING_DOWN, Http::scServiceUnavailable, request);
errorAppendEntry(entry, anErr);
}
self = NULL; // refcounted
}
// If the Server quits before nibbling at the request body, the body sender
// will not know (so that we can retry). Call this if we will not retry. We
// will notify the sender so that it does not get stuck waiting for space.
void
FwdState::doneWithRetries()
{
if (request && request->body_pipe != NULL)
request->body_pipe->expectNoConsumption();
}
// called by the server that failed after calling unregister()
void
FwdState::handleUnregisteredServerEnd()
{
debugs(17, 2, HERE << "self=" << self << " err=" << err << ' ' << entry->url());
assert(!Comm::IsConnOpen(serverConn));
retryOrBail();
}
void
FwdState::connectDone(const Comm::ConnectionPointer &conn, Comm::Flag status, int xerrno)
{
if (status != Comm::OK) {
ErrorState *const anErr = makeConnectingError(ERR_CONNECT_FAIL);
anErr->xerrno = xerrno;
fail(anErr);
/* it might have been a timeout with a partially open link */
if (conn != NULL) {
if (conn->getPeer())
peerConnectFailed(conn->getPeer());
conn->close();
}
retryOrBail();
return;
}
serverConn = conn;
debugs(17, 3, HERE << serverConnection() << ": '" << entry->url() << "'" );
closeHandler = comm_add_close_handler(serverConnection()->fd, fwdServerClosedWrapper, this);
#if USE_OPENSSL
if (!request->flags.pinned) {
const CachePeer *p = serverConnection()->getPeer();
const bool peerWantsTls = p && p->use_ssl;
// userWillTlsToPeerForUs assumes CONNECT == HTTPS
const bool userWillTlsToPeerForUs = p && p->options.originserver &&
request->method == Http::METHOD_CONNECT;
const bool needTlsToPeer = peerWantsTls && !userWillTlsToPeerForUs;
const bool needTlsToOrigin = !p && request->url.getScheme() == AnyP::PROTO_HTTPS;
if (needTlsToPeer || needTlsToOrigin || request->flags.sslPeek) {
HttpRequest::Pointer requestPointer = request;
AsyncCall::Pointer callback = asyncCall(17,4,
"FwdState::ConnectedToPeer",
FwdStatePeerAnswerDialer(&FwdState::connectedToPeer, this));
// Use positive timeout when less than one second is left.
const time_t sslNegotiationTimeout = max(static_cast<time_t>(1), timeLeft());
Ssl::PeerConnector *connector =
new Ssl::PeerConnector(requestPointer, serverConnection(), clientConn, callback, sslNegotiationTimeout);
AsyncJob::Start(connector); // will call our callback
return;
}
}
#endif
// should reach ConnStateData before the dispatched Client job starts
CallJobHere1(17, 4, request->clientConnectionManager, ConnStateData,
ConnStateData::notePeerConnection, serverConnection());
dispatch();
}
#if USE_OPENSSL
void
FwdState::connectedToPeer(Ssl::PeerConnectorAnswer &answer)
{
if (ErrorState *error = answer.error.get()) {
fail(error);
answer.error.clear(); // preserve error for errorSendComplete()
if (CachePeer *p = serverConnection()->getPeer())
peerConnectFailed(p);
serverConnection()->close();
return;
}
if (serverConnection()->getPeer())
peerConnectSucceded(serverConnection()->getPeer());
flags.connected_okay = true;
dispatch();
}
#endif
void
FwdState::connectTimeout(int fd)
{
debugs(17, 2, "fwdConnectTimeout: FD " << fd << ": '" << entry->url() << "'" );
assert(serverDestinations[0] != NULL);
assert(fd == serverDestinations[0]->fd);
if (entry->isEmpty()) {
ErrorState *anErr = new ErrorState(ERR_CONNECT_FAIL, Http::scGatewayTimeout, request);
anErr->xerrno = ETIMEDOUT;
fail(anErr);
/* This marks the peer DOWN ... */
if (serverDestinations[0]->getPeer())
peerConnectFailed(serverDestinations[0]->getPeer());
}
if (Comm::IsConnOpen(serverDestinations[0])) {
serverDestinations[0]->close();
}
}
time_t
FwdState::timeLeft() const
{
/* connection timeout */
int ctimeout;
if (serverDestinations[0]->getPeer()) {
ctimeout = serverDestinations[0]->getPeer()->connect_timeout > 0 ?
serverDestinations[0]->getPeer()->connect_timeout : Config.Timeout.peer_connect;
} else {
ctimeout = Config.Timeout.connect;
}
/* calculate total forwarding timeout ??? */
int ftimeout = Config.Timeout.forward - (squid_curtime - start_t);
if (ftimeout < 0)
ftimeout = 5;
if (ftimeout < ctimeout)
return (time_t)ftimeout;
else
return (time_t)ctimeout;
}
/// called when serverConn is set to an _open_ to-peer connection
void
FwdState::syncWithServerConn(const char *host)
{
if (Ip::Qos::TheConfig.isAclTosActive())
Ip::Qos::setSockTos(serverConn, GetTosToServer(request));
#if SO_MARK
if (Ip::Qos::TheConfig.isAclNfmarkActive())
Ip::Qos::setSockNfmark(serverConn, GetNfmarkToServer(request));
#endif
request->hier.note(serverConn, host);
}
/**
* Called after forwarding path selection (via peer select) has taken place
* and whenever forwarding needs to attempt a new connection (routing failover).
* We have a vector of possible localIP->remoteIP paths now ready to start being connected.
*/
void
FwdState::connectStart()
{
assert(serverDestinations.size() > 0);
debugs(17, 3, "fwdConnectStart: " << entry->url());
request->hier.startPeerClock();
// Do not fowrward bumped connections to parent proxy unless it is an
// origin server
if (serverDestinations[0]->getPeer() && !serverDestinations[0]->getPeer()->options.originserver && request->flags.sslBumped) {
debugs(50, 4, "fwdConnectStart: Ssl bumped connections through parent proxy are not allowed");
ErrorState *anErr = new ErrorState(ERR_CANNOT_FORWARD, Http::scServiceUnavailable, request);
fail(anErr);
self = NULL; // refcounted
return;
}
request->flags.pinned = false; // XXX: what if the ConnStateData set this to flag existing credentials?
// XXX: answer: the peer selection *should* catch it and give us only the pinned peer. so we reverse the =0 step below.
// XXX: also, logs will now lie if pinning is broken and leads to an error message.
if (serverDestinations[0]->peerType == PINNED) {
ConnStateData *pinned_connection = request->pinnedConnection();
debugs(17,7, "pinned peer connection: " << pinned_connection);
// pinned_connection may become nil after a pconn race
if (pinned_connection)
serverConn = pinned_connection->borrowPinnedConnection(request, serverDestinations[0]->getPeer());
else
serverConn = NULL;
if (Comm::IsConnOpen(serverConn)) {
pinned_connection->stopPinnedConnectionMonitoring();
flags.connected_okay = true;
++n_tries;
request->flags.pinned = true;
if (pinned_connection->pinnedAuth())
request->flags.auth = true;
closeHandler = comm_add_close_handler(serverConn->fd, fwdServerClosedWrapper, this);
syncWithServerConn(pinned_connection->pinning.host);
// the server may close the pinned connection before this request
pconnRace = racePossible;
dispatch();
return;
}
// Pinned connection failure.
debugs(17,2,HERE << "Pinned connection failed: " << pinned_connection);
ErrorState *anErr = new ErrorState(ERR_ZERO_SIZE_OBJECT, Http::scServiceUnavailable, request);
fail(anErr);
self = NULL; // refcounted
return;
}
// Use pconn to avoid opening a new connection.
const char *host = NULL;
if (!serverDestinations[0]->getPeer())
host = request->GetHost();
Comm::ConnectionPointer temp;
// Avoid pconns after races so that the same client does not suffer twice.
// This does not increase the total number of connections because we just
// closed the connection that failed the race. And re-pinning assumes this.
if (pconnRace != raceHappened)
temp = pconnPop(serverDestinations[0], host);
const bool openedPconn = Comm::IsConnOpen(temp);
pconnRace = openedPconn ? racePossible : raceImpossible;
// if we found an open persistent connection to use. use it.
if (openedPconn) {
serverConn = temp;
flags.connected_okay = true;
debugs(17, 3, HERE << "reusing pconn " << serverConnection());
++n_tries;
closeHandler = comm_add_close_handler(serverConnection()->fd, fwdServerClosedWrapper, this);
syncWithServerConn(request->GetHost());
dispatch();
return;
}
// We will try to open a new connection, possibly to the same destination.
// We reset serverDestinations[0] in case we are using it again because
// ConnOpener modifies its destination argument.
serverDestinations[0]->local.port(0);
serverConn = NULL;
#if URL_CHECKSUM_DEBUG
entry->mem_obj->checkUrlChecksum();
#endif
GetMarkingsToServer(request, *serverDestinations[0]);
calls.connector = commCbCall(17,3, "fwdConnectDoneWrapper", CommConnectCbPtrFun(fwdConnectDoneWrapper, this));
Comm::ConnOpener *cs = new Comm::ConnOpener(serverDestinations[0], calls.connector, timeLeft());
if (host)
cs->setHost(host);
AsyncJob::Start(cs);
}
void
FwdState::dispatch()
{
debugs(17, 3, clientConn << ": Fetching " << request->method << ' ' << entry->url());
/*
* Assert that server_fd is set. This is to guarantee that fwdState
* is attached to something and will be deallocated when server_fd
* is closed.
*/
assert(Comm::IsConnOpen(serverConn));
fd_note(serverConnection()->fd, entry->url());
fd_table[serverConnection()->fd].noteUse();
/*assert(!EBIT_TEST(entry->flags, ENTRY_DISPATCHED)); */
assert(entry->ping_status != PING_WAITING);
assert(entry->locked());
EBIT_SET(entry->flags, ENTRY_DISPATCHED);
netdbPingSite(request->GetHost());
/* Retrieves remote server TOS or MARK value, and stores it as part of the
* original client request FD object. It is later used to forward
* remote server's TOS/MARK in the response to the client in case of a MISS.
*/
if (Ip::Qos::TheConfig.isHitNfmarkActive()) {
if (Comm::IsConnOpen(clientConn) && Comm::IsConnOpen(serverConnection())) {
fde * clientFde = &fd_table[clientConn->fd]; // XXX: move the fd_table access into Ip::Qos
/* Get the netfilter mark for the connection */
Ip::Qos::getNfmarkFromServer(serverConnection(), clientFde);
}
}
#if _SQUID_LINUX_
/* Bug 2537: The TOS forward part of QOS only applies to patched Linux kernels. */
if (Ip::Qos::TheConfig.isHitTosActive()) {
if (Comm::IsConnOpen(clientConn)) {
fde * clientFde = &fd_table[clientConn->fd]; // XXX: move the fd_table access into Ip::Qos
/* Get the TOS value for the packet */
Ip::Qos::getTosFromServer(serverConnection(), clientFde);
}
}
#endif
#if USE_OPENSSL
if (request->flags.sslPeek) {
CallJobHere1(17, 4, request->clientConnectionManager, ConnStateData,
ConnStateData::httpsPeeked, ConnStateData::PinnedIdleContext(serverConnection(), request));
unregister(serverConn); // async call owns it now
complete(); // destroys us
return;
}
#endif
if (serverConnection()->getPeer() != NULL) {
++ serverConnection()->getPeer()->stats.fetches;
request->peer_login = serverConnection()->getPeer()->login;
request->peer_domain = serverConnection()->getPeer()->domain;
httpStart(this);
} else {
assert(!request->flags.sslPeek);
request->peer_login = NULL;
request->peer_domain = NULL;
switch (request->url.getScheme()) {
#if USE_OPENSSL
case AnyP::PROTO_HTTPS:
httpStart(this);
break;
#endif
case AnyP::PROTO_HTTP:
httpStart(this);
break;
case AnyP::PROTO_GOPHER:
gopherStart(this);
break;
case AnyP::PROTO_FTP:
if (request->flags.ftpNative)
Ftp::StartRelay(this);
else
Ftp::StartGateway(this);
break;
case AnyP::PROTO_CACHE_OBJECT:
case AnyP::PROTO_URN:
fatal_dump("Should never get here");
break;