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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/components/firewall_hole/firewall_hole.h"
#include <fcntl.h>
#include <stdint.h>
#include <unistd.h>
#include <utility>
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/task/single_thread_task_runner.h"
#include "chromeos/dbus/permission_broker/permission_broker_client.h"
namespace chromeos {
namespace {
const char* PortTypeToString(FirewallHole::PortType type) {
switch (type) {
case FirewallHole::PortType::kTcp:
return "TCP";
case FirewallHole::PortType::kUdp:
return "UDP";
}
NOTREACHED();
}
void PortReleased(FirewallHole::PortType type,
uint16_t port,
const std::string& interface,
base::ScopedFD lifeline_fd,
bool success) {
if (!success) {
LOG(WARNING) << "Failed to release firewall hole for "
<< PortTypeToString(type) << " port " << port << " on "
<< interface << ".";
}
}
} // namespace
// static
void FirewallHole::Open(PortType type,
uint16_t port,
const std::string& interface,
OpenCallback callback) {
int lifeline[2] = {-1, -1};
if (pipe2(lifeline, O_CLOEXEC) < 0) {
PLOG(ERROR) << "Failed to create a lifeline pipe";
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(std::move(callback), nullptr));
return;
}
base::ScopedFD lifeline_local(lifeline[1]);
base::ScopedFD lifeline_remote(lifeline[0]);
base::OnceCallback<void(bool)> access_granted_closure =
base::BindOnce(&FirewallHole::PortAccessGranted, type, port, interface,
std::move(lifeline_local), std::move(callback));
chromeos::PermissionBrokerClient* client =
chromeos::PermissionBrokerClient::Get();
DCHECK(client) << "Could not get permission broker client.";
switch (type) {
case PortType::kTcp:
client->RequestTcpPortAccess(port, interface, lifeline_remote.get(),
std::move(access_granted_closure));
return;
case PortType::kUdp:
client->RequestUdpPortAccess(port, interface, lifeline_remote.get(),
std::move(access_granted_closure));
return;
}
}
FirewallHole::~FirewallHole() {
base::OnceCallback<void(bool)> port_released_closure = base::BindOnce(
&PortReleased, type_, port_, interface_, std::move(lifeline_fd_));
chromeos::PermissionBrokerClient* client =
chromeos::PermissionBrokerClient::Get();
// See crbug.com/1429368: sometimes the shutdown routine for
// PermissionBrokerClient takes place before firewall holes are released.
if (!client) {
LOG(ERROR) << "Could not get permission broker client.";
return;
}
switch (type_) {
case PortType::kTcp:
client->ReleaseTcpPort(port_, interface_,
std::move(port_released_closure));
return;
case PortType::kUdp:
client->ReleaseUdpPort(port_, interface_,
std::move(port_released_closure));
return;
}
}
void FirewallHole::PortAccessGranted(PortType type,
uint16_t port,
const std::string& interface,
base::ScopedFD lifeline_fd,
FirewallHole::OpenCallback callback,
bool success) {
if (success) {
std::move(callback).Run(base::WrapUnique(
new FirewallHole(type, port, interface, std::move(lifeline_fd))));
} else {
std::move(callback).Run(nullptr);
}
}
FirewallHole::FirewallHole(PortType type,
uint16_t port,
const std::string& interface,
base::ScopedFD lifeline_fd)
: type_(type),
port_(port),
interface_(interface),
lifeline_fd_(std::move(lifeline_fd)) {}
} // namespace chromeos
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