gecko-dev/ipc/netd/Netd.cpp

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "Netd.h"
#include <android/log.h>
#include <cutils/sockets.h>
#include <fcntl.h>
#include <sys/socket.h>
#include "cutils/properties.h"
#include "android/log.h"
#include "nsWhitespaceTokenizer.h"
#include "nsXULAppAPI.h"
#include "nsAutoPtr.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#define LOG(args...) __android_log_print(ANDROID_LOG_INFO, "Gonk", args)
#define ICS_SYS_USB_RNDIS_MAC "/sys/class/android_usb/android0/f_rndis/ethaddr"
#define INVALID_SOCKET -1
#define MAX_RECONNECT_TIMES 10
namespace {
mozilla::RefPtr<mozilla::ipc::NetdClient> gNetdClient;
mozilla::RefPtr<mozilla::ipc::NetdConsumer> gNetdConsumer;
class StopNetdConsumer : public nsRunnable {
public:
NS_IMETHOD Run()
{
MOZ_ASSERT(NS_IsMainThread());
gNetdConsumer = nullptr;
return NS_OK;
}
};
bool
InitRndisAddress()
{
char mac[20];
char serialno[] = "1234567890ABCDEF";
static const int kEthernetAddressLength = 6;
char address[kEthernetAddressLength];
int i = 0;
int ret = 0;
int length = 0;
mozilla::ScopedClose fd;
fd.rwget() = open(ICS_SYS_USB_RNDIS_MAC, O_WRONLY);
if (fd.rwget() == -1) {
LOG("Unable to open file %s.", ICS_SYS_USB_RNDIS_MAC);
return false;
}
property_get("ro.serialno", serialno, "1234567890ABCDEF");
// First byte is 0x02 to signify a locally administered address.
address[0] = 0x02;
length = strlen(serialno);
for (i = 0; i < length; i++) {
address[i % (kEthernetAddressLength - 1) + 1] ^= serialno[i];
}
sprintf(mac, "%02x:%02x:%02x:%02x:%02x:%02x",
address[0], address[1], address[2],
address[3], address[4], address[5]);
length = strlen(mac);
ret = write(fd.get(), mac, length);
if (ret != length) {
LOG("Fail to write file %s.", ICS_SYS_USB_RNDIS_MAC);
return false;
}
return true;
}
} // anonymous namespace
namespace mozilla {
namespace ipc {
NetdClient::NetdClient()
: mSocket(INVALID_SOCKET)
, mIOLoop(MessageLoopForIO::current())
, mCurrentWriteOffset(0)
, mReceivedIndex(0)
, mReConnectTimes(0)
{
MOZ_COUNT_CTOR(NetdClient);
}
NetdClient::~NetdClient()
{
MOZ_COUNT_DTOR(NetdClient);
}
bool
NetdClient::OpenSocket()
{
mSocket.rwget() = socket_local_client("netd",
ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_STREAM);
if (mSocket.rwget() < 0) {
LOG("Error connecting to : netd (%s) - will retry", strerror(errno));
return false;
}
// Add FD_CLOEXEC flag.
int flags = fcntl(mSocket.get(), F_GETFD);
if (flags == -1) {
LOG("Error doing fcntl with F_GETFD command(%s)", strerror(errno));
return false;
}
flags |= FD_CLOEXEC;
if (fcntl(mSocket.get(), F_SETFD, flags) == -1) {
LOG("Error doing fcntl with F_SETFD command(%s)", strerror(errno));
return false;
}
// Set non-blocking.
if (fcntl(mSocket.get(), F_SETFL, O_NONBLOCK) == -1) {
LOG("Error set non-blocking socket(%s)", strerror(errno));
return false;
}
if (!MessageLoopForIO::current()->
WatchFileDescriptor(mSocket.get(),
true,
MessageLoopForIO::WATCH_READ,
&mReadWatcher,
this)) {
LOG("Error set socket read watcher(%s)", strerror(errno));
return false;
}
if (!mOutgoingQ.empty()) {
MessageLoopForIO::current()->
WatchFileDescriptor(mSocket.get(),
false,
MessageLoopForIO::WATCH_WRITE,
&mWriteWatcher,
this);
}
LOG("Connected to netd");
return true;
}
void
NetdClient::OnFileCanReadWithoutBlocking(int aFd)
{
ssize_t length = 0;
MOZ_ASSERT(aFd == mSocket.get());
while (true) {
errno = 0;
MOZ_ASSERT(mReceivedIndex < MAX_COMMAND_SIZE);
length = read(aFd, &mReceiveBuffer[mReceivedIndex], MAX_COMMAND_SIZE - mReceivedIndex);
MOZ_ASSERT(length <= ssize_t(MAX_COMMAND_SIZE - mReceivedIndex));
if (length <= 0) {
if (length == -1) {
if (errno == EINTR) {
continue; // retry system call when interrupted
}
if (errno == EAGAIN || errno == EWOULDBLOCK) {
return; // no data available: return and re-poll
}
}
LOG("Can't read from netd error: %d (%s) length: %d", errno, strerror(errno), length);
// At this point, assume that we can't actually access
// the socket anymore, and start a reconnect loop.
Restart();
return;
}
while (length-- > 0) {
MOZ_ASSERT(mReceivedIndex < MAX_COMMAND_SIZE);
if (mReceiveBuffer[mReceivedIndex] == '\0') {
// We found a line terminator. Each line is formatted as an
// integer response code followed by the rest of the line.
// Fish out the response code.
errno = 0;
int responseCode = strtol(mReceiveBuffer, nullptr, 10);
// TODO, Bug 783966, handle InterfaceChange(600) and BandwidthControl(601).
if (!errno && responseCode < 600) {
NetdCommand* response = new NetdCommand();
// Passing all the response message, including the line terminator.
response->mSize = mReceivedIndex + 1;
memcpy(response->mData, mReceiveBuffer, mReceivedIndex + 1);
gNetdConsumer->MessageReceived(response);
}
if (!responseCode || errno) {
LOG("Can't parse netd's response: %d (%s)", errno, strerror(errno));
}
// There is data in the receive buffer beyond the current line.
// Shift it down to the beginning.
if (length > 0) {
MOZ_ASSERT(mReceivedIndex < (MAX_COMMAND_SIZE - 1));
memmove(&mReceiveBuffer[0], &mReceiveBuffer[mReceivedIndex + 1], length);
}
mReceivedIndex = 0;
} else {
mReceivedIndex++;
}
}
}
}
void
NetdClient::OnFileCanWriteWithoutBlocking(int aFd)
{
MOZ_ASSERT(aFd == mSocket.get());
WriteNetdCommand();
}
void
NetdClient::Restart()
{
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
mReadWatcher.StopWatchingFileDescriptor();
mWriteWatcher.StopWatchingFileDescriptor();
mSocket.dispose();
mReceivedIndex = 0;
mCurrentWriteOffset = 0;
mCurrentNetdCommand = nullptr;
while (!mOutgoingQ.empty()) {
delete mOutgoingQ.front();
mOutgoingQ.pop();
}
Start();
}
// static
void
NetdClient::Start()
{
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
if (!gNetdClient) {
LOG("Netd Client is not initialized");
return;
}
if (!gNetdClient->OpenSocket()) {
// Socket open failed, try again in a second.
LOG("Fail to connect to Netd");
if (++gNetdClient->mReConnectTimes > MAX_RECONNECT_TIMES) {
LOG("Fail to connect to Netd after retry %d times", MAX_RECONNECT_TIMES);
return;
}
MessageLoopForIO::current()->
PostDelayedTask(FROM_HERE,
NewRunnableFunction(NetdClient::Start),
1000);
return;
}
gNetdClient->mReConnectTimes = 0;
}
// static
void
NetdClient::SendNetdCommandIOThread(NetdCommand* aMessage)
{
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
MOZ_ASSERT(aMessage);
if (!gNetdClient) {
LOG("Netd Client is not initialized");
return;
}
gNetdClient->mOutgoingQ.push(aMessage);
if (gNetdClient->mSocket.get() == INVALID_SOCKET) {
LOG("Netd connection is not established, push the message to queue");
return;
}
gNetdClient->WriteNetdCommand();
}
void
NetdClient::WriteNetdCommand()
{
if (!mCurrentNetdCommand) {
mCurrentWriteOffset = 0;
mCurrentNetdCommand = mOutgoingQ.front();
mOutgoingQ.pop();
}
while (mCurrentWriteOffset < mCurrentNetdCommand->mSize) {
ssize_t write_amount = mCurrentNetdCommand->mSize - mCurrentWriteOffset;
ssize_t written = write(mSocket.get(),
mCurrentNetdCommand->mData + mCurrentWriteOffset,
write_amount);
if (written < 0) {
LOG("Cannot write to network, error %d\n", (int) written);
Restart();
return;
}
if (written > 0) {
mCurrentWriteOffset += written;
}
if (written != write_amount) {
LOG("WriteNetdCommand fail !!! Write is not completed");
break;
}
}
if (mCurrentWriteOffset != mCurrentNetdCommand->mSize) {
MessageLoopForIO::current()->
WatchFileDescriptor(mSocket.get(),
false,
MessageLoopForIO::WATCH_WRITE,
&mWriteWatcher,
this);
return;
}
mCurrentNetdCommand = nullptr;
}
static void
InitNetdIOThread()
{
bool result;
char propValue[PROPERTY_VALUE_MAX];
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
MOZ_ASSERT(!gNetdClient);
property_get("ro.build.version.sdk", propValue, "0");
// Assign rndis address for usb tethering in ICS.
if (atoi(propValue) >= 15) {
result = InitRndisAddress();
// We don't return here because InitRnsisAddress() function is related to
// usb tethering only. Others service such as wifi tethering still need
// to use ipc to communicate with netd.
if (!result) {
LOG("fail to give rndis interface an address");
}
}
gNetdClient = new NetdClient();
gNetdClient->Start();
}
static void
ShutdownNetdIOThread()
{
MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
nsCOMPtr<nsIRunnable> shutdownEvent = new StopNetdConsumer();
gNetdClient = nullptr;
NS_DispatchToMainThread(shutdownEvent);
}
void
StartNetd(NetdConsumer* aNetdConsumer)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aNetdConsumer);
MOZ_ASSERT(gNetdConsumer == nullptr);
gNetdConsumer = aNetdConsumer;
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(InitNetdIOThread));
}
void
StopNetd()
{
MOZ_ASSERT(NS_IsMainThread());
nsIThread* currentThread = NS_GetCurrentThread();
NS_ASSERTION(currentThread, "This should never be null!");
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(ShutdownNetdIOThread));
while (gNetdConsumer) {
if (!NS_ProcessNextEvent(currentThread)) {
NS_WARNING("Something bad happened!");
break;
}
}
}
/**************************************************************************
*
* This function runs in net worker Thread context. The net worker thread
* is created in dom/system/gonk/NetworkManager.js
*
**************************************************************************/
void
SendNetdCommand(NetdCommand* aMessage)
{
MOZ_ASSERT(aMessage);
XRE_GetIOMessageLoop()->PostTask(
FROM_HERE,
NewRunnableFunction(NetdClient::SendNetdCommandIOThread, aMessage));
}
} // namespace ipc
} // namespace mozilla