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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/dns_blackhole_checker.h"
#include "base/callback_helpers.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_request_context_getter.h"
#include "remoting/base/logging.h"
#include "url/gurl.h"
namespace remoting {
// Default prefix added to the base talkgadget URL.
const char kDefaultHostTalkGadgetPrefix[] = "chromoting-host";
// The base talkgadget URL.
const char kTalkGadgetUrl[] = ".talkgadget.google.com/talkgadget/"
"oauth/chrome-remote-desktop-host";
DnsBlackholeChecker::DnsBlackholeChecker(
const scoped_refptr<net::URLRequestContextGetter>& request_context_getter,
std::string talkgadget_prefix)
: url_request_context_getter_(request_context_getter),
talkgadget_prefix_(talkgadget_prefix) {
}
DnsBlackholeChecker::~DnsBlackholeChecker() {
}
// This is called in response to the TalkGadget http request initiated from
// CheckStatus().
void DnsBlackholeChecker::OnURLFetchComplete(const net::URLFetcher* source) {
int response = source->GetResponseCode();
bool allow = false;
if (source->GetResponseCode() == 200) {
HOST_LOG << "Successfully connected to host talkgadget.";
allow = true;
} else {
HOST_LOG << "Unable to connect to host talkgadget (" << response << ")";
}
url_fetcher_.reset(nullptr);
base::ResetAndReturn(&callback_).Run(allow);
}
void DnsBlackholeChecker::CheckForDnsBlackhole(
const base::Callback<void(bool)>& callback) {
// Make sure we're not currently in the middle of a connection check.
if (!url_fetcher_.get()) {
DCHECK(callback_.is_null());
callback_ = callback;
std::string talkgadget_url("https://");
if (talkgadget_prefix_.empty()) {
talkgadget_url += kDefaultHostTalkGadgetPrefix;
} else {
talkgadget_url += talkgadget_prefix_;
}
talkgadget_url += kTalkGadgetUrl;
HOST_LOG << "Verifying connection to " << talkgadget_url;
url_fetcher_ = net::URLFetcher::Create(GURL(talkgadget_url),
net::URLFetcher::GET, this);
url_fetcher_->SetRequestContext(url_request_context_getter_.get());
url_fetcher_->Start();
} else {
HOST_LOG << "Pending connection check";
}
}
} // namespace remoting
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