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//===-- PlatformAndroidRemoteGDBServer.cpp ----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Other libraries and framework includes
#include "lldb/Core/Error.h"
#include "lldb/Core/Log.h"
#include "lldb/Host/common/TCPSocket.h"
#include "AdbClient.h"
#include "PlatformAndroidRemoteGDBServer.h"
#include "Utility/UriParser.h"
#include <sstream>
using namespace lldb;
using namespace lldb_private;
using namespace platform_android;
static const lldb::pid_t g_remote_platform_pid = 0; // Alias for the process id of lldb-platform
static Error
ForwardPortWithAdb (const uint16_t local_port, const uint16_t remote_port, std::string& device_id)
{
Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_PLATFORM));
AdbClient adb;
auto error = AdbClient::CreateByDeviceID(device_id, adb);
if (error.Fail ())
return error;
device_id = adb.GetDeviceID();
if (log)
log->Printf("Connected to Android device \"%s\"", device_id.c_str ());
return adb.SetPortForwarding(local_port, remote_port);
}
static Error
DeleteForwardPortWithAdb (uint16_t local_port, const std::string& device_id)
{
AdbClient adb (device_id);
return adb.DeletePortForwarding (local_port);
}
static Error
FindUnusedPort (uint16_t& port)
{
Error error;
std::unique_ptr<TCPSocket> tcp_socket(new TCPSocket(false, error));
if (error.Fail())
return error;
error = tcp_socket->Listen("127.0.0.1:0", 1);
if (error.Success())
port = tcp_socket->GetLocalPortNumber();
return error;
}
PlatformAndroidRemoteGDBServer::PlatformAndroidRemoteGDBServer ()
{
}
PlatformAndroidRemoteGDBServer::~PlatformAndroidRemoteGDBServer ()
{
for (const auto& it : m_port_forwards)
DeleteForwardPortWithAdb(it.second, m_device_id);
}
uint16_t
PlatformAndroidRemoteGDBServer::LaunchGDBserverAndGetPort (lldb::pid_t &pid)
{
uint16_t remote_port = m_gdb_client.LaunchGDBserverAndGetPort (pid, "127.0.0.1");
if (remote_port == 0)
return remote_port;
uint16_t local_port = 0;
auto error = SetPortForwarding (pid, remote_port, local_port);
return error.Success() ? local_port : 0;
}
bool
PlatformAndroidRemoteGDBServer::KillSpawnedProcess (lldb::pid_t pid)
{
DeleteForwardPort (pid);
return m_gdb_client.KillSpawnedProcess (pid);
}
Error
PlatformAndroidRemoteGDBServer::ConnectRemote (Args& args)
{
m_device_id.clear();
if (args.GetArgumentCount() != 1)
return Error("\"platform connect\" takes a single argument: <connect-url>");
int remote_port;
std::string scheme, host, path;
const char *url = args.GetArgumentAtIndex (0);
if (!url)
return Error("URL is null.");
if (!UriParser::Parse (url, scheme, host, remote_port, path))
return Error("Invalid URL: %s", url);
if (scheme == "adb")
m_device_id = host;
uint16_t local_port = 0;
auto error = SetPortForwarding (g_remote_platform_pid, remote_port, local_port);
if (error.Fail ())
return error;
const std::string new_url = MakeUrl(
scheme.c_str(), host.c_str(), local_port, path.c_str());
args.ReplaceArgumentAtIndex (0, new_url.c_str ());
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PLATFORM));
if (log)
log->Printf("Rewritten URL: %s", new_url.c_str());
error = PlatformRemoteGDBServer::ConnectRemote(args);
if (error.Fail ())
DeleteForwardPort (g_remote_platform_pid);
return error;
}
Error
PlatformAndroidRemoteGDBServer::DisconnectRemote ()
{
DeleteForwardPort (g_remote_platform_pid);
return PlatformRemoteGDBServer::DisconnectRemote ();
}
void
PlatformAndroidRemoteGDBServer::DeleteForwardPort (lldb::pid_t pid)
{
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PLATFORM));
auto it = m_port_forwards.find(pid);
if (it == m_port_forwards.end())
return;
const auto port = it->second;
const auto error = DeleteForwardPortWithAdb(port, m_device_id);
if (error.Fail()) {
if (log)
log->Printf("Failed to delete port forwarding (pid=%" PRIu64 ", port=%d, device=%s): %s",
pid, port, m_device_id.c_str(), error.AsCString());
}
m_port_forwards.erase(it);
}
Error
PlatformAndroidRemoteGDBServer::SetPortForwarding(const lldb::pid_t pid,
const uint16_t remote_port,
uint16_t &local_port)
{
static const int kAttempsNum = 5;
Error error;
// There is a race possibility that somebody will occupy
// a port while we're in between FindUnusedPort and ForwardPortWithAdb -
// adding the loop to mitigate such problem.
for (auto i = 0; i < kAttempsNum; ++i)
{
error = FindUnusedPort(local_port);
if (error.Fail())
return error;
error = ForwardPortWithAdb(local_port, remote_port, m_device_id);
if (error.Success())
{
m_port_forwards[pid] = local_port;
break;
}
}
return error;
}
std::string
PlatformAndroidRemoteGDBServer::MakeUrl(const char* scheme,
const char* hostname,
uint16_t port,
const char* path)
{
std::ostringstream hostname_str;
if (!strcmp(scheme, "adb"))
hostname_str << "[" << hostname << "]";
else
hostname_str << hostname;
return PlatformRemoteGDBServer::MakeUrl(scheme,
hostname_str.str().c_str(),
port,
path);
}
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