path: root/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.cpp

//===-- GDBRemoteCommunicationServer.cpp ------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//


#include "GDBRemoteCommunicationServer.h"

// C Includes
// C++ Includes
// Other libraries and framework includes
#include "llvm/ADT/Triple.h"
#include "lldb/Interpreter/Args.h"
#include "lldb/Core/ConnectionFileDescriptor.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/State.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Host/Endian.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/TimeValue.h"
#include "lldb/Target/Process.h"

// Project includes
#include "Utility/StringExtractorGDBRemote.h"
#include "ProcessGDBRemote.h"
#include "ProcessGDBRemoteLog.h"

using namespace lldb;
using namespace lldb_private;

//----------------------------------------------------------------------
// GDBRemoteCommunicationServer constructor
//----------------------------------------------------------------------
GDBRemoteCommunicationServer::GDBRemoteCommunicationServer(bool is_platform) :
    GDBRemoteCommunication ("gdb-remote.server", "gdb-remote.server.rx_packet", is_platform),
    m_async_thread (LLDB_INVALID_HOST_THREAD),
    m_process_launch_info (),
    m_process_launch_error (),
    m_proc_infos (),
    m_proc_infos_index (0),
    m_lo_port_num (0),
    m_hi_port_num (0)
{
}

//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
GDBRemoteCommunicationServer::~GDBRemoteCommunicationServer()
{
}


//void *
//GDBRemoteCommunicationServer::AsyncThread (void *arg)
//{
//    GDBRemoteCommunicationServer *server = (GDBRemoteCommunicationServer*) arg;
//
//    Log *log;// (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PROCESS));
//    if (log)
//        log->Printf ("ProcessGDBRemote::%s (arg = %p, pid = %i) thread starting...", __FUNCTION__, arg, process->GetID());
//
//    StringExtractorGDBRemote packet;
//    
//    while ()
//    {
//        if (packet.
//    }
//
//    if (log)
//        log->Printf ("ProcessGDBRemote::%s (arg = %p, pid = %i) thread exiting...", __FUNCTION__, arg, process->GetID());
//
//    process->m_async_thread = LLDB_INVALID_HOST_THREAD;
//    return NULL;
//}
//
bool
GDBRemoteCommunicationServer::GetPacketAndSendResponse (uint32_t timeout_usec, 
                                                        Error &error,
                                                        bool &interrupt, 
                                                        bool &quit)
{
    StringExtractorGDBRemote packet;
    if (WaitForPacketWithTimeoutMicroSecondsNoLock (packet, timeout_usec))
    {
        const StringExtractorGDBRemote::ServerPacketType packet_type = packet.GetServerPacketType ();
        switch (packet_type)
        {
            case StringExtractorGDBRemote::eServerPacketType_nack:
            case StringExtractorGDBRemote::eServerPacketType_ack:
                break;

            case StringExtractorGDBRemote::eServerPacketType_invalid:
                error.SetErrorString("invalid packet");
                quit = true;
                break;

            case StringExtractorGDBRemote::eServerPacketType_interrupt:
                error.SetErrorString("interrupt received");
                interrupt = true;
                break;
            
            case StringExtractorGDBRemote::eServerPacketType_unimplemented:
                return SendUnimplementedResponse (packet.GetStringRef().c_str()) > 0;

            case StringExtractorGDBRemote::eServerPacketType_A:
                return Handle_A (packet);

            case StringExtractorGDBRemote::eServerPacketType_qfProcessInfo:
                return Handle_qfProcessInfo (packet);
                
            case StringExtractorGDBRemote::eServerPacketType_qsProcessInfo:
                return Handle_qsProcessInfo (packet);
                
            case StringExtractorGDBRemote::eServerPacketType_qC:
                return Handle_qC (packet);
                
            case StringExtractorGDBRemote::eServerPacketType_qHostInfo:
                return Handle_qHostInfo (packet);
                
            case StringExtractorGDBRemote::eServerPacketType_qLaunchGDBServer:
                return Handle_qLaunchGDBServer (packet);
                
            case StringExtractorGDBRemote::eServerPacketType_qLaunchSuccess:
                return Handle_qLaunchSuccess (packet);
                
            case StringExtractorGDBRemote::eServerPacketType_qGroupName:
                return Handle_qGroupName (packet);

            case StringExtractorGDBRemote::eServerPacketType_qProcessInfoPID:
                return Handle_qProcessInfoPID (packet);

            case StringExtractorGDBRemote::eServerPacketType_qSpeedTest:
                return Handle_qSpeedTest (packet);

            case StringExtractorGDBRemote::eServerPacketType_qUserName:
                return Handle_qUserName (packet);

            case StringExtractorGDBRemote::eServerPacketType_QEnvironment:
                return Handle_QEnvironment (packet);
            
            case StringExtractorGDBRemote::eServerPacketType_QSetDisableASLR:
                return Handle_QSetDisableASLR (packet);
            
            case StringExtractorGDBRemote::eServerPacketType_QSetSTDIN:
                return Handle_QSetSTDIN (packet);
            
            case StringExtractorGDBRemote::eServerPacketType_QSetSTDOUT:
                return Handle_QSetSTDOUT (packet);
            
            case StringExtractorGDBRemote::eServerPacketType_QSetSTDERR:
                return Handle_QSetSTDERR (packet);
            
            case StringExtractorGDBRemote::eServerPacketType_QSetWorkingDir:
                return Handle_QSetWorkingDir (packet);

            case StringExtractorGDBRemote::eServerPacketType_QStartNoAckMode:
                return Handle_QStartNoAckMode (packet);
        }
        return true;
    }
    else
    {
        if (!IsConnected())
            error.SetErrorString("lost connection");
        else
            error.SetErrorString("timeout");
    }

    return false;
}

size_t
GDBRemoteCommunicationServer::SendUnimplementedResponse (const char *)
{
    // TODO: Log the packet we aren't handling...
    return SendPacketNoLock ("", 0);
}

size_t
GDBRemoteCommunicationServer::SendErrorResponse (uint8_t err)
{
    char packet[16];
    int packet_len = ::snprintf (packet, sizeof(packet), "E%2.2x", err);
    assert (packet_len < (int)sizeof(packet));
    return SendPacketNoLock (packet, packet_len);
}


size_t
GDBRemoteCommunicationServer::SendOKResponse ()
{
    return SendPacketNoLock ("OK", 2);
}

bool
GDBRemoteCommunicationServer::HandshakeWithClient(Error *error_ptr)
{
    return GetAck();
}

bool
GDBRemoteCommunicationServer::Handle_qHostInfo (StringExtractorGDBRemote &packet)
{
    StreamString response;
    
    // $cputype:16777223;cpusubtype:3;ostype:Darwin;vendor:apple;endian:little;ptrsize:8;#00

    ArchSpec host_arch (Host::GetArchitecture ());
    const llvm::Triple &host_triple = host_arch.GetTriple();
    response.PutCString("triple:");
    response.PutCStringAsRawHex8(host_triple.getTriple().c_str());
    response.Printf (";ptrsize:%u;",host_arch.GetAddressByteSize());

    uint32_t cpu = host_arch.GetMachOCPUType();
    uint32_t sub = host_arch.GetMachOCPUSubType();
    if (cpu != LLDB_INVALID_CPUTYPE)
        response.Printf ("cputype:%u;", cpu);
    if (sub != LLDB_INVALID_CPUTYPE)
        response.Printf ("cpusubtype:%u;", sub);
    
    if (cpu == ArchSpec::kCore_arm_any)
        response.Printf("watchpoint_exceptions_received:before;");   // On armv7 we use "synchronous" watchpoints which means the exception is delivered before the instruction executes.
    else
        response.Printf("watchpoint_exceptions_received:after;");
    
    switch (lldb::endian::InlHostByteOrder())
    {
    case eByteOrderBig:     response.PutCString ("endian:big;"); break;
    case eByteOrderLittle:  response.PutCString ("endian:little;"); break;
    case eByteOrderPDP:     response.PutCString ("endian:pdp;"); break;
    default:                response.PutCString ("endian:unknown;"); break;
    }
    
    uint32_t major = UINT32_MAX;
    uint32_t minor = UINT32_MAX;
    uint32_t update = UINT32_MAX;
    if (Host::GetOSVersion (major, minor, update))
    {
        if (major != UINT32_MAX)
        {
            response.Printf("os_version:%u", major);
            if (minor != UINT32_MAX)
            {
                response.Printf(".%u", minor);
                if (update != UINT32_MAX)
                    response.Printf(".%u", update);
            }
            response.PutChar(';');
        }
    }

    std::string s;
    if (Host::GetOSBuildString (s))
    {
        response.PutCString ("os_build:");
        response.PutCStringAsRawHex8(s.c_str());
        response.PutChar(';');
    }
    if (Host::GetOSKernelDescription (s))
    {
        response.PutCString ("os_kernel:");
        response.PutCStringAsRawHex8(s.c_str());
        response.PutChar(';');
    }
    if (Host::GetHostname (s))
    {
        response.PutCString ("hostname:");
        response.PutCStringAsRawHex8(s.c_str());
        response.PutChar(';');
    }
    
    return SendPacketNoLock (response.GetData(), response.GetSize()) > 0;
}

static void
CreateProcessInfoResponse (const ProcessInstanceInfo &proc_info, StreamString &response)
{
    response.Printf ("pid:%" PRIu64 ";ppid:%" PRIu64 ";uid:%i;gid:%i;euid:%i;egid:%i;",
                     proc_info.GetProcessID(),
                     proc_info.GetParentProcessID(),
                     proc_info.GetUserID(),
                     proc_info.GetGroupID(),
                     proc_info.GetEffectiveUserID(),
                     proc_info.GetEffectiveGroupID());
    response.PutCString ("name:");
    response.PutCStringAsRawHex8(proc_info.GetName());
    response.PutChar(';');
    const ArchSpec &proc_arch = proc_info.GetArchitecture();
    if (proc_arch.IsValid())
    {
        const llvm::Triple &proc_triple = proc_arch.GetTriple();
        response.PutCString("triple:");
        response.PutCStringAsRawHex8(proc_triple.getTriple().c_str());
        response.PutChar(';');
    }
}

bool
GDBRemoteCommunicationServer::Handle_qProcessInfoPID (StringExtractorGDBRemote &packet)
{
    // Packet format: "qProcessInfoPID:%i" where %i is the pid
    packet.SetFilePos(::strlen ("qProcessInfoPID:"));
    lldb::pid_t pid = packet.GetU32 (LLDB_INVALID_PROCESS_ID);
    if (pid != LLDB_INVALID_PROCESS_ID)
    {
        ProcessInstanceInfo proc_info;
        if (Host::GetProcessInfo(pid, proc_info))
        {
            StreamString response;
            CreateProcessInfoResponse (proc_info, response);
            return SendPacketNoLock (response.GetData(), response.GetSize());
        }
    }
    return SendErrorResponse (1);
}

bool 
GDBRemoteCommunicationServer::Handle_qfProcessInfo (StringExtractorGDBRemote &packet)
{
    m_proc_infos_index = 0;
    m_proc_infos.Clear();

    ProcessInstanceInfoMatch match_info;
    packet.SetFilePos(::strlen ("qfProcessInfo"));
    if (packet.GetChar() == ':')
    {
    
        std::string key;
        std::string value;
        while (packet.GetNameColonValue(key, value))
        {
            bool success = true;
            if (key.compare("name") == 0)
            {
                StringExtractor extractor;
                extractor.GetStringRef().swap(value);
                extractor.GetHexByteString (value);
                match_info.GetProcessInfo().GetExecutableFile().SetFile(value.c_str(), false);
            }
            else if (key.compare("name_match") == 0)
            {
                if (value.compare("equals") == 0)
                {
                    match_info.SetNameMatchType (eNameMatchEquals);
                }
                else if (value.compare("starts_with") == 0)
                {
                    match_info.SetNameMatchType (eNameMatchStartsWith);
                }
                else if (value.compare("ends_with") == 0)
                {
                    match_info.SetNameMatchType (eNameMatchEndsWith);
                }
                else if (value.compare("contains") == 0)
                {
                    match_info.SetNameMatchType (eNameMatchContains);
                }
                else if (value.compare("regex") == 0)       
                {
                    match_info.SetNameMatchType (eNameMatchRegularExpression);
                }
                else 
                {
                    success = false;
                }
            }
            else if (key.compare("pid") == 0)
            {
                match_info.GetProcessInfo().SetProcessID (Args::StringToUInt32(value.c_str(), LLDB_INVALID_PROCESS_ID, 0, &success));
            }
            else if (key.compare("parent_pid") == 0)
            {
                match_info.GetProcessInfo().SetParentProcessID (Args::StringToUInt32(value.c_str(), LLDB_INVALID_PROCESS_ID, 0, &success));
            }
            else if (key.compare("uid") == 0)
            {
                match_info.GetProcessInfo().SetUserID (Args::StringToUInt32(value.c_str(), UINT32_MAX, 0, &success));
            }
            else if (key.compare("gid") == 0)
            {
                match_info.GetProcessInfo().SetGroupID (Args::StringToUInt32(value.c_str(), UINT32_MAX, 0, &success));
            }
            else if (key.compare("euid") == 0)
            {
                match_info.GetProcessInfo().SetEffectiveUserID (Args::StringToUInt32(value.c_str(), UINT32_MAX, 0, &success));
            }
            else if (key.compare("egid") == 0)
            {
                match_info.GetProcessInfo().SetEffectiveGroupID (Args::StringToUInt32(value.c_str(), UINT32_MAX, 0, &success));
            }
            else if (key.compare("all_users") == 0)
            {
                match_info.SetMatchAllUsers(Args::StringToBoolean(value.c_str(), false, &success));
            }
            else if (key.compare("triple") == 0)
            {
                match_info.GetProcessInfo().GetArchitecture().SetTriple (value.c_str(), NULL);
            }
            else
            {
                success = false;
            }
            
            if (!success)
                return SendErrorResponse (2);
        }
    }

    if (Host::FindProcesses (match_info, m_proc_infos))
    {
        // We found something, return the first item by calling the get
        // subsequent process info packet handler...
        return Handle_qsProcessInfo (packet);
    }
    return SendErrorResponse (3);
}

bool 
GDBRemoteCommunicationServer::Handle_qsProcessInfo (StringExtractorGDBRemote &packet)
{
    if (m_proc_infos_index < m_proc_infos.GetSize())
    {
        StreamString response;
        CreateProcessInfoResponse (m_proc_infos.GetProcessInfoAtIndex(m_proc_infos_index), response);
        ++m_proc_infos_index;
        return SendPacketNoLock (response.GetData(), response.GetSize());
    }
    return SendErrorResponse (4);
}

bool 
GDBRemoteCommunicationServer::Handle_qUserName (StringExtractorGDBRemote &packet)
{
    // Packet format: "qUserName:%i" where %i is the uid
    packet.SetFilePos(::strlen ("qUserName:"));
    uint32_t uid = packet.GetU32 (UINT32_MAX);
    if (uid != UINT32_MAX)
    {
        std::string name;
        if (Host::GetUserName (uid, name))
        {
            StreamString response;
            response.PutCStringAsRawHex8 (name.c_str());
            return SendPacketNoLock (response.GetData(), response.GetSize());
        }
    }
    return SendErrorResponse (5);
    
}

bool 
GDBRemoteCommunicationServer::Handle_qGroupName (StringExtractorGDBRemote &packet)
{
    // Packet format: "qGroupName:%i" where %i is the gid
    packet.SetFilePos(::strlen ("qGroupName:"));
    uint32_t gid = packet.GetU32 (UINT32_MAX);
    if (gid != UINT32_MAX)
    {
        std::string name;
        if (Host::GetGroupName (gid, name))
        {
            StreamString response;
            response.PutCStringAsRawHex8 (name.c_str());
            return SendPacketNoLock (response.GetData(), response.GetSize());
        }
    }
    return SendErrorResponse (6);
}

bool
GDBRemoteCommunicationServer::Handle_qSpeedTest (StringExtractorGDBRemote &packet)
{
    packet.SetFilePos(::strlen ("qSpeedTest:"));

    std::string key;
    std::string value;
    bool success = packet.GetNameColonValue(key, value);
    if (success && key.compare("response_size") == 0)
    {
        uint32_t response_size = Args::StringToUInt32(value.c_str(), 0, 0, &success);
        if (success)
        {
            if (response_size == 0)
                return SendOKResponse();
            StreamString response;
            uint32_t bytes_left = response_size;
            response.PutCString("data:");
            while (bytes_left > 0)
            {
                if (bytes_left >= 26)
                {
                    response.PutCString("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
                    bytes_left -= 26;
                }
                else
                {
                    response.Printf ("%*.*s;", bytes_left, bytes_left, "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
                    bytes_left = 0;
                }
            }
            return SendPacketNoLock (response.GetData(), response.GetSize());
        }
    }
    return SendErrorResponse (7);
}


static void *
AcceptPortFromInferior (void *arg)
{
    const char *connect_url = (const char *)arg;
    ConnectionFileDescriptor file_conn;
    Error error;
    if (file_conn.Connect (connect_url, &error) == eConnectionStatusSuccess)
    {
        char pid_str[256];
        ::memset (pid_str, 0, sizeof(pid_str));
        ConnectionStatus status;
        const size_t pid_str_len = file_conn.Read (pid_str, sizeof(pid_str), 0, status, NULL);
        if (pid_str_len > 0)
        {
            int pid = atoi (pid_str);
            return (void *)(intptr_t)pid;
        }
    }
    return NULL;
}
//
//static bool
//WaitForProcessToSIGSTOP (const lldb::pid_t pid, const int timeout_in_seconds)
//{
//    const int time_delta_usecs = 100000;
//    const int num_retries = timeout_in_seconds/time_delta_usecs;
//    for (int i=0; i<num_retries; i++)
//    {
//        struct proc_bsdinfo bsd_info;
//        int error = ::proc_pidinfo (pid, PROC_PIDTBSDINFO, 
//                                    (uint64_t) 0, 
//                                    &bsd_info, 
//                                    PROC_PIDTBSDINFO_SIZE);
//        
//        switch (error)
//        {
//            case EINVAL:
//            case ENOTSUP:
//            case ESRCH:
//            case EPERM:
//                return false;
//                
//            default:
//                break;
//                
//            case 0:
//                if (bsd_info.pbi_status == SSTOP)
//                    return true;
//        }
//        ::usleep (time_delta_usecs);
//    }
//    return false;
//}

bool
GDBRemoteCommunicationServer::Handle_A (StringExtractorGDBRemote &packet)
{
    // The 'A' packet is the most over designed packet ever here with 
    // redundant argument indexes, redundant argument lengths and needed hex 
    // encoded argument string values. Really all that is needed is a comma 
    // separated hex encoded argument value list, but we will stay true to the
    // documented version of the 'A' packet here...

    packet.SetFilePos(1); // Skip the 'A'
    bool success = true;
    while (success && packet.GetBytesLeft() > 0)
    {
        // Decode the decimal argument string length. This length is the
        // number of hex nibbles in the argument string value.
        const uint32_t arg_len = packet.GetU32(UINT32_MAX);
        if (arg_len == UINT32_MAX)
            success = false;
        else
        {
            // Make sure the argument hex string length is followed by a comma
            if (packet.GetChar() != ',')
                success = false;
            else
            {
                // Decode the argument index. We ignore this really becuase
                // who would really send down the arguments in a random order???
                const uint32_t arg_idx = packet.GetU32(UINT32_MAX);
                if (arg_idx == UINT32_MAX)
                    success = false;
                else
                {
                    // Make sure the argument index is followed by a comma
                    if (packet.GetChar() != ',')
                        success = false;
                    else
                    {
                        // Decode the argument string value from hex bytes
                        // back into a UTF8 string and make sure the length
                        // matches the one supplied in the packet
                        std::string arg;
                        if (packet.GetHexByteString(arg) != (arg_len / 2))
                            success = false;
                        else
                        {
                            // If there are any bytes lft
                            if (packet.GetBytesLeft())
                            {
                                if (packet.GetChar() != ',')
                                    success = false;
                            }
                            
                            if (success)
                            {
                                if (arg_idx == 0)
                                    m_process_launch_info.GetExecutableFile().SetFile(arg.c_str(), false);
                                m_process_launch_info.GetArguments().AppendArgument(arg.c_str());
                            }
                        }
                    }
                }
            }
        }
    }

    if (success)
    {
        m_process_launch_info.GetFlags().Set (eLaunchFlagDebug);
        m_process_launch_error = Host::LaunchProcess (m_process_launch_info);
        if (m_process_launch_info.GetProcessID() != LLDB_INVALID_PROCESS_ID)
        {
            return SendOKResponse ();
        }
    }
    return SendErrorResponse (8);
}

bool
GDBRemoteCommunicationServer::Handle_qC (StringExtractorGDBRemote &packet)
{
    lldb::pid_t pid = m_process_launch_info.GetProcessID();
    StreamString response;
    response.Printf("QC%" PRIx64, pid);
    if (m_is_platform)
    {
        // If we launch a process and this GDB server is acting as a platform, 
        // then we need to clear the process launch state so we can start 
        // launching another process. In order to launch a process a bunch or
        // packets need to be sent: environment packets, working directory,
        // disable ASLR, and many more settings. When we launch a process we 
        // then need to know when to clear this information. Currently we are
        // selecting the 'qC' packet as that packet which seems to make the most
        // sense.
        if (pid != LLDB_INVALID_PROCESS_ID)
        {
            m_process_launch_info.Clear();
        }
    }
    return SendPacketNoLock (response.GetData(), response.GetSize());
}

bool
GDBRemoteCommunicationServer::Handle_qLaunchGDBServer (StringExtractorGDBRemote &packet)
{
#ifdef _WIN32
    // No unix sockets on windows
    return false;
#else
    // Spawn a local debugserver as a platform so we can then attach or launch
    // a process...

    if (m_is_platform)
    {
        // Sleep and wait a bit for debugserver to start to listen...
        ConnectionFileDescriptor file_conn;
        char connect_url[PATH_MAX];
        Error error;
        char unix_socket_name[PATH_MAX] = "/tmp/XXXXXX";    
        if (::mktemp (unix_socket_name) == NULL)
        {
            error.SetErrorString ("failed to make temporary path for a unix socket");
        }
        else
        {
            ::snprintf (connect_url, sizeof(connect_url), "unix-accept://%s", unix_socket_name);
            // Spawn a new thread to accept the port that gets bound after
            // binding to port 0 (zero).
            lldb::thread_t accept_thread = Host::ThreadCreate (unix_socket_name,
                                                               AcceptPortFromInferior,
                                                               connect_url,
                                                               &error);
            
            if (IS_VALID_LLDB_HOST_THREAD(accept_thread))
            {
                // Spawn a debugserver and try to get
                ProcessLaunchInfo debugserver_launch_info;
                error = StartDebugserverProcess ("localhost:0", 
                                                 unix_socket_name, 
                                                 debugserver_launch_info);
                
                lldb::pid_t debugserver_pid = debugserver_launch_info.GetProcessID();
                if (error.Success())
                {
                    bool success = false;
                    
                    thread_result_t accept_thread_result = NULL;
                    if (Host::ThreadJoin (accept_thread, &accept_thread_result, &error))
                    {
                        if (accept_thread_result)
                        {
                            uint16_t port = (intptr_t)accept_thread_result;
                            char response[256];
                            const int response_len = ::snprintf (response, sizeof(response), "pid:%" PRIu64 ";port:%u;", debugserver_pid, port);
                            assert (response_len < (int)sizeof(response));
                            //m_port_to_pid_map[port] = debugserver_launch_info.GetProcessID();
                            success = SendPacketNoLock (response, response_len) > 0;
                        }
                    }
                    ::unlink (unix_socket_name);
                    
                    if (!success)
                    {
                        if (debugserver_pid != LLDB_INVALID_PROCESS_ID)
                            ::kill (debugserver_pid, SIGINT);
                    }
                    return success;
                }
            }
        }
    }
    return SendErrorResponse (13);
#endif
}

bool
GDBRemoteCommunicationServer::Handle_qLaunchSuccess (StringExtractorGDBRemote &packet)
{
    if (m_process_launch_error.Success())
        return SendOKResponse();
    StreamString response;    
    response.PutChar('E');
    response.PutCString(m_process_launch_error.AsCString("<unknown error>"));
    return SendPacketNoLock (response.GetData(), response.GetSize());
}

bool
GDBRemoteCommunicationServer::Handle_QEnvironment  (StringExtractorGDBRemote &packet)
{
    packet.SetFilePos(::strlen ("QEnvironment:"));
    const uint32_t bytes_left = packet.GetBytesLeft();
    if (bytes_left > 0)
    {
        m_process_launch_info.GetEnvironmentEntries ().AppendArgument (packet.Peek());
        return SendOKResponse ();
    }
    return SendErrorResponse (9);
}

bool
GDBRemoteCommunicationServer::Handle_QSetDisableASLR (StringExtractorGDBRemote &packet)
{
    packet.SetFilePos(::strlen ("QSetDisableASLR:"));
    if (packet.GetU32(0))
        m_process_launch_info.GetFlags().Set (eLaunchFlagDisableASLR);
    else
        m_process_launch_info.GetFlags().Clear (eLaunchFlagDisableASLR);
    return SendOKResponse ();
}

bool
GDBRemoteCommunicationServer::Handle_QSetWorkingDir (StringExtractorGDBRemote &packet)
{
    packet.SetFilePos(::strlen ("QSetWorkingDir:"));
    std::string path;
    packet.GetHexByteString(path);
    m_process_launch_info.SwapWorkingDirectory (path);
    return SendOKResponse ();
}

bool
GDBRemoteCommunicationServer::Handle_QSetSTDIN (StringExtractorGDBRemote &packet)
{
    packet.SetFilePos(::strlen ("QSetSTDIN:"));
    ProcessLaunchInfo::FileAction file_action;
    std::string path;
    packet.GetHexByteString(path);
    const bool read = false;
    const bool write = true;
    if (file_action.Open(STDIN_FILENO, path.c_str(), read, write))
    {
        m_process_launch_info.AppendFileAction(file_action);
        return SendOKResponse ();
    }
    return SendErrorResponse (10);
}

bool
GDBRemoteCommunicationServer::Handle_QSetSTDOUT (StringExtractorGDBRemote &packet)
{
    packet.SetFilePos(::strlen ("QSetSTDOUT:"));
    ProcessLaunchInfo::FileAction file_action;
    std::string path;
    packet.GetHexByteString(path);
    const bool read = true;
    const bool write = false;
    if (file_action.Open(STDOUT_FILENO, path.c_str(), read, write))
    {
        m_process_launch_info.AppendFileAction(file_action);
        return SendOKResponse ();
    }
    return SendErrorResponse (11);
}

bool
GDBRemoteCommunicationServer::Handle_QSetSTDERR (StringExtractorGDBRemote &packet)
{
    packet.SetFilePos(::strlen ("QSetSTDERR:"));
    ProcessLaunchInfo::FileAction file_action;
    std::string path;
    packet.GetHexByteString(path);
    const bool read = true;
    const bool write = false;
    if (file_action.Open(STDERR_FILENO, path.c_str(), read, write))
    {
        m_process_launch_info.AppendFileAction(file_action);
        return SendOKResponse ();
    }
    return SendErrorResponse (12);
}

bool
GDBRemoteCommunicationServer::Handle_QStartNoAckMode (StringExtractorGDBRemote &packet)
{
    // Send response first before changing m_send_acks to we ack this packet
    SendOKResponse ();
    m_send_acks = false;
    return true;
}