| //===-- GDBRemoteCommunication.cpp ----------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "GDBRemoteCommunication.h" |
| |
| #include <climits> |
| #include <cstring> |
| #include <future> |
| #include <sys/stat.h> |
| |
| #include "lldb/Core/StreamFile.h" |
| #include "lldb/Host/Config.h" |
| #include "lldb/Host/ConnectionFileDescriptor.h" |
| #include "lldb/Host/FileSystem.h" |
| #include "lldb/Host/Host.h" |
| #include "lldb/Host/HostInfo.h" |
| #include "lldb/Host/Pipe.h" |
| #include "lldb/Host/ProcessLaunchInfo.h" |
| #include "lldb/Host/Socket.h" |
| #include "lldb/Host/ThreadLauncher.h" |
| #include "lldb/Host/common/TCPSocket.h" |
| #include "lldb/Host/posix/ConnectionFileDescriptorPosix.h" |
| #include "lldb/Target/Platform.h" |
| #include "lldb/Utility/Event.h" |
| #include "lldb/Utility/FileSpec.h" |
| #include "lldb/Utility/Log.h" |
| #include "lldb/Utility/RegularExpression.h" |
| #include "lldb/Utility/Reproducer.h" |
| #include "lldb/Utility/StreamString.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "llvm/Support/ScopedPrinter.h" |
| |
| #include "ProcessGDBRemoteLog.h" |
| |
| #if defined(__APPLE__) |
| #define DEBUGSERVER_BASENAME "debugserver" |
| #elif defined(_WIN32) |
| #define DEBUGSERVER_BASENAME "lldb-server.exe" |
| #else |
| #define DEBUGSERVER_BASENAME "lldb-server" |
| #endif |
| |
| #if defined(HAVE_LIBCOMPRESSION) |
| #include <compression.h> |
| #endif |
| |
| #if LLVM_ENABLE_ZLIB |
| #include <zlib.h> |
| #endif |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| using namespace lldb_private::process_gdb_remote; |
| |
| // GDBRemoteCommunication constructor |
| GDBRemoteCommunication::GDBRemoteCommunication(const char *comm_name, |
| const char *listener_name) |
| : Communication(comm_name), |
| #ifdef LLDB_CONFIGURATION_DEBUG |
| m_packet_timeout(1000), |
| #else |
| m_packet_timeout(1), |
| #endif |
| m_echo_number(0), m_supports_qEcho(eLazyBoolCalculate), m_history(512), |
| m_send_acks(true), m_compression_type(CompressionType::None), |
| m_listen_url() { |
| } |
| |
| // Destructor |
| GDBRemoteCommunication::~GDBRemoteCommunication() { |
| if (IsConnected()) { |
| Disconnect(); |
| } |
| |
| #if defined(HAVE_LIBCOMPRESSION) |
| if (m_decompression_scratch) |
| free (m_decompression_scratch); |
| #endif |
| } |
| |
| char GDBRemoteCommunication::CalculcateChecksum(llvm::StringRef payload) { |
| int checksum = 0; |
| |
| for (char c : payload) |
| checksum += c; |
| |
| return checksum & 255; |
| } |
| |
| size_t GDBRemoteCommunication::SendAck() { |
| Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS)); |
| ConnectionStatus status = eConnectionStatusSuccess; |
| char ch = '+'; |
| const size_t bytes_written = WriteAll(&ch, 1, status, nullptr); |
| LLDB_LOGF(log, "<%4" PRIu64 "> send packet: %c", (uint64_t)bytes_written, ch); |
| m_history.AddPacket(ch, GDBRemotePacket::ePacketTypeSend, bytes_written); |
| return bytes_written; |
| } |
| |
| size_t GDBRemoteCommunication::SendNack() { |
| Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS)); |
| ConnectionStatus status = eConnectionStatusSuccess; |
| char ch = '-'; |
| const size_t bytes_written = WriteAll(&ch, 1, status, nullptr); |
| LLDB_LOGF(log, "<%4" PRIu64 "> send packet: %c", (uint64_t)bytes_written, ch); |
| m_history.AddPacket(ch, GDBRemotePacket::ePacketTypeSend, bytes_written); |
| return bytes_written; |
| } |
| |
| GDBRemoteCommunication::PacketResult |
| GDBRemoteCommunication::SendPacketNoLock(llvm::StringRef payload) { |
| StreamString packet(0, 4, eByteOrderBig); |
| packet.PutChar('$'); |
| packet.Write(payload.data(), payload.size()); |
| packet.PutChar('#'); |
| packet.PutHex8(CalculcateChecksum(payload)); |
| std::string packet_str = std::string(packet.GetString()); |
| |
| return SendRawPacketNoLock(packet_str); |
| } |
| |
| GDBRemoteCommunication::PacketResult |
| GDBRemoteCommunication::SendRawPacketNoLock(llvm::StringRef packet, |
| bool skip_ack) { |
| if (IsConnected()) { |
| Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS)); |
| ConnectionStatus status = eConnectionStatusSuccess; |
| const char *packet_data = packet.data(); |
| const size_t packet_length = packet.size(); |
| size_t bytes_written = WriteAll(packet_data, packet_length, status, nullptr); |
| if (log) { |
| size_t binary_start_offset = 0; |
| if (strncmp(packet_data, "$vFile:pwrite:", strlen("$vFile:pwrite:")) == |
| 0) { |
| const char *first_comma = strchr(packet_data, ','); |
| if (first_comma) { |
| const char *second_comma = strchr(first_comma + 1, ','); |
| if (second_comma) |
| binary_start_offset = second_comma - packet_data + 1; |
| } |
| } |
| |
| // If logging was just enabled and we have history, then dump out what we |
| // have to the log so we get the historical context. The Dump() call that |
| // logs all of the packet will set a boolean so that we don't dump this |
| // more than once |
| if (!m_history.DidDumpToLog()) |
| m_history.Dump(log); |
| |
| if (binary_start_offset) { |
| StreamString strm; |
| // Print non binary data header |
| strm.Printf("<%4" PRIu64 "> send packet: %.*s", (uint64_t)bytes_written, |
| (int)binary_start_offset, packet_data); |
| const uint8_t *p; |
| // Print binary data exactly as sent |
| for (p = (const uint8_t *)packet_data + binary_start_offset; *p != '#'; |
| ++p) |
| strm.Printf("\\x%2.2x", *p); |
| // Print the checksum |
| strm.Printf("%*s", (int)3, p); |
| log->PutString(strm.GetString()); |
| } else |
| LLDB_LOGF(log, "<%4" PRIu64 "> send packet: %.*s", |
| (uint64_t)bytes_written, (int)packet_length, packet_data); |
| } |
| |
| m_history.AddPacket(packet.str(), packet_length, |
| GDBRemotePacket::ePacketTypeSend, bytes_written); |
| |
| if (bytes_written == packet_length) { |
| if (!skip_ack && GetSendAcks()) |
| return GetAck(); |
| else |
| return PacketResult::Success; |
| } else { |
| LLDB_LOGF(log, "error: failed to send packet: %.*s", (int)packet_length, |
| packet_data); |
| } |
| } |
| return PacketResult::ErrorSendFailed; |
| } |
| |
| GDBRemoteCommunication::PacketResult GDBRemoteCommunication::GetAck() { |
| StringExtractorGDBRemote packet; |
| PacketResult result = WaitForPacketNoLock(packet, GetPacketTimeout(), false); |
| if (result == PacketResult::Success) { |
| if (packet.GetResponseType() == |
| StringExtractorGDBRemote::ResponseType::eAck) |
| return PacketResult::Success; |
| else |
| return PacketResult::ErrorSendAck; |
| } |
| return result; |
| } |
| |
| GDBRemoteCommunication::PacketResult |
| GDBRemoteCommunication::ReadPacketWithOutputSupport( |
| StringExtractorGDBRemote &response, Timeout<std::micro> timeout, |
| bool sync_on_timeout, |
| llvm::function_ref<void(llvm::StringRef)> output_callback) { |
| auto result = ReadPacket(response, timeout, sync_on_timeout); |
| while (result == PacketResult::Success && response.IsNormalResponse() && |
| response.PeekChar() == 'O') { |
| response.GetChar(); |
| std::string output; |
| if (response.GetHexByteString(output)) |
| output_callback(output); |
| result = ReadPacket(response, timeout, sync_on_timeout); |
| } |
| return result; |
| } |
| |
| GDBRemoteCommunication::PacketResult |
| GDBRemoteCommunication::ReadPacket(StringExtractorGDBRemote &response, |
| Timeout<std::micro> timeout, |
| bool sync_on_timeout) { |
| using ResponseType = StringExtractorGDBRemote::ResponseType; |
| |
| Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS)); |
| for (;;) { |
| PacketResult result = |
| WaitForPacketNoLock(response, timeout, sync_on_timeout); |
| if (result != PacketResult::Success || |
| (response.GetResponseType() != ResponseType::eAck && |
| response.GetResponseType() != ResponseType::eNack)) |
| return result; |
| LLDB_LOG(log, "discarding spurious `{0}` packet", response.GetStringRef()); |
| } |
| } |
| |
| GDBRemoteCommunication::PacketResult |
| GDBRemoteCommunication::WaitForPacketNoLock(StringExtractorGDBRemote &packet, |
| Timeout<std::micro> timeout, |
| bool sync_on_timeout) { |
| uint8_t buffer[8192]; |
| Status error; |
| |
| Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS)); |
| |
| // Check for a packet from our cache first without trying any reading... |
| if (CheckForPacket(nullptr, 0, packet) != PacketType::Invalid) |
| return PacketResult::Success; |
| |
| bool timed_out = false; |
| bool disconnected = false; |
| while (IsConnected() && !timed_out) { |
| lldb::ConnectionStatus status = eConnectionStatusNoConnection; |
| size_t bytes_read = Read(buffer, sizeof(buffer), timeout, status, &error); |
| |
| LLDB_LOGV(log, |
| "Read(buffer, sizeof(buffer), timeout = {0}, " |
| "status = {1}, error = {2}) => bytes_read = {3}", |
| timeout, Communication::ConnectionStatusAsString(status), error, |
| bytes_read); |
| |
| if (bytes_read > 0) { |
| if (CheckForPacket(buffer, bytes_read, packet) != PacketType::Invalid) |
| return PacketResult::Success; |
| } else { |
| switch (status) { |
| case eConnectionStatusTimedOut: |
| case eConnectionStatusInterrupted: |
| if (sync_on_timeout) { |
| /// Sync the remote GDB server and make sure we get a response that |
| /// corresponds to what we send. |
| /// |
| /// Sends a "qEcho" packet and makes sure it gets the exact packet |
| /// echoed back. If the qEcho packet isn't supported, we send a qC |
| /// packet and make sure we get a valid thread ID back. We use the |
| /// "qC" packet since its response if very unique: is responds with |
| /// "QC%x" where %x is the thread ID of the current thread. This |
| /// makes the response unique enough from other packet responses to |
| /// ensure we are back on track. |
| /// |
| /// This packet is needed after we time out sending a packet so we |
| /// can ensure that we are getting the response for the packet we |
| /// are sending. There are no sequence IDs in the GDB remote |
| /// protocol (there used to be, but they are not supported anymore) |
| /// so if you timeout sending packet "abc", you might then send |
| /// packet "cde" and get the response for the previous "abc" packet. |
| /// Many responses are "OK" or "" (unsupported) or "EXX" (error) so |
| /// many responses for packets can look like responses for other |
| /// packets. So if we timeout, we need to ensure that we can get |
| /// back on track. If we can't get back on track, we must |
| /// disconnect. |
| bool sync_success = false; |
| bool got_actual_response = false; |
| // We timed out, we need to sync back up with the |
| char echo_packet[32]; |
| int echo_packet_len = 0; |
| RegularExpression response_regex; |
| |
| if (m_supports_qEcho == eLazyBoolYes) { |
| echo_packet_len = ::snprintf(echo_packet, sizeof(echo_packet), |
| "qEcho:%u", ++m_echo_number); |
| std::string regex_str = "^"; |
| regex_str += echo_packet; |
| regex_str += "$"; |
| response_regex = RegularExpression(regex_str); |
| } else { |
| echo_packet_len = |
| ::snprintf(echo_packet, sizeof(echo_packet), "qC"); |
| response_regex = |
| RegularExpression(llvm::StringRef("^QC[0-9A-Fa-f]+$")); |
| } |
| |
| PacketResult echo_packet_result = |
| SendPacketNoLock(llvm::StringRef(echo_packet, echo_packet_len)); |
| if (echo_packet_result == PacketResult::Success) { |
| const uint32_t max_retries = 3; |
| uint32_t successful_responses = 0; |
| for (uint32_t i = 0; i < max_retries; ++i) { |
| StringExtractorGDBRemote echo_response; |
| echo_packet_result = |
| WaitForPacketNoLock(echo_response, timeout, false); |
| if (echo_packet_result == PacketResult::Success) { |
| ++successful_responses; |
| if (response_regex.Execute(echo_response.GetStringRef())) { |
| sync_success = true; |
| break; |
| } else if (successful_responses == 1) { |
| // We got something else back as the first successful |
| // response, it probably is the response to the packet we |
| // actually wanted, so copy it over if this is the first |
| // success and continue to try to get the qEcho response |
| packet = echo_response; |
| got_actual_response = true; |
| } |
| } else if (echo_packet_result == PacketResult::ErrorReplyTimeout) |
| continue; // Packet timed out, continue waiting for a response |
| else |
| break; // Something else went wrong getting the packet back, we |
| // failed and are done trying |
| } |
| } |
| |
| // We weren't able to sync back up with the server, we must abort |
| // otherwise all responses might not be from the right packets... |
| if (sync_success) { |
| // We timed out, but were able to recover |
| if (got_actual_response) { |
| // We initially timed out, but we did get a response that came in |
| // before the successful reply to our qEcho packet, so lets say |
| // everything is fine... |
| return PacketResult::Success; |
| } |
| } else { |
| disconnected = true; |
| Disconnect(); |
| } |
| } |
| timed_out = true; |
| break; |
| case eConnectionStatusSuccess: |
| // printf ("status = success but error = %s\n", |
| // error.AsCString("<invalid>")); |
| break; |
| |
| case eConnectionStatusEndOfFile: |
| case eConnectionStatusNoConnection: |
| case eConnectionStatusLostConnection: |
| case eConnectionStatusError: |
| disconnected = true; |
| Disconnect(); |
| break; |
| } |
| } |
| } |
| packet.Clear(); |
| if (disconnected) |
| return PacketResult::ErrorDisconnected; |
| if (timed_out) |
| return PacketResult::ErrorReplyTimeout; |
| else |
| return PacketResult::ErrorReplyFailed; |
| } |
| |
| bool GDBRemoteCommunication::DecompressPacket() { |
| Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS)); |
| |
| if (!CompressionIsEnabled()) |
| return true; |
| |
| size_t pkt_size = m_bytes.size(); |
| |
| // Smallest possible compressed packet is $N#00 - an uncompressed empty |
| // reply, most commonly indicating an unsupported packet. Anything less than |
| // 5 characters, it's definitely not a compressed packet. |
| if (pkt_size < 5) |
| return true; |
| |
| if (m_bytes[0] != '$' && m_bytes[0] != '%') |
| return true; |
| if (m_bytes[1] != 'C' && m_bytes[1] != 'N') |
| return true; |
| |
| size_t hash_mark_idx = m_bytes.find('#'); |
| if (hash_mark_idx == std::string::npos) |
| return true; |
| if (hash_mark_idx + 2 >= m_bytes.size()) |
| return true; |
| |
| if (!::isxdigit(m_bytes[hash_mark_idx + 1]) || |
| !::isxdigit(m_bytes[hash_mark_idx + 2])) |
| return true; |
| |
| size_t content_length = |
| pkt_size - |
| 5; // not counting '$', 'C' | 'N', '#', & the two hex checksum chars |
| size_t content_start = 2; // The first character of the |
| // compressed/not-compressed text of the packet |
| size_t checksum_idx = |
| hash_mark_idx + |
| 1; // The first character of the two hex checksum characters |
| |
| // Normally size_of_first_packet == m_bytes.size() but m_bytes may contain |
| // multiple packets. size_of_first_packet is the size of the initial packet |
| // which we'll replace with the decompressed version of, leaving the rest of |
| // m_bytes unmodified. |
| size_t size_of_first_packet = hash_mark_idx + 3; |
| |
| // Compressed packets ("$C") start with a base10 number which is the size of |
| // the uncompressed payload, then a : and then the compressed data. e.g. |
| // $C1024:<binary>#00 Update content_start and content_length to only include |
| // the <binary> part of the packet. |
| |
| uint64_t decompressed_bufsize = ULONG_MAX; |
| if (m_bytes[1] == 'C') { |
| size_t i = content_start; |
| while (i < hash_mark_idx && isdigit(m_bytes[i])) |
| i++; |
| if (i < hash_mark_idx && m_bytes[i] == ':') { |
| i++; |
| content_start = i; |
| content_length = hash_mark_idx - content_start; |
| std::string bufsize_str(m_bytes.data() + 2, i - 2 - 1); |
| errno = 0; |
| decompressed_bufsize = ::strtoul(bufsize_str.c_str(), nullptr, 10); |
| if (errno != 0 || decompressed_bufsize == ULONG_MAX) { |
| m_bytes.erase(0, size_of_first_packet); |
| return false; |
| } |
| } |
| } |
| |
| if (GetSendAcks()) { |
| char packet_checksum_cstr[3]; |
| packet_checksum_cstr[0] = m_bytes[checksum_idx]; |
| packet_checksum_cstr[1] = m_bytes[checksum_idx + 1]; |
| packet_checksum_cstr[2] = '\0'; |
| long packet_checksum = strtol(packet_checksum_cstr, nullptr, 16); |
| |
| long actual_checksum = CalculcateChecksum( |
| llvm::StringRef(m_bytes).substr(1, hash_mark_idx - 1)); |
| bool success = packet_checksum == actual_checksum; |
| if (!success) { |
| LLDB_LOGF(log, |
| "error: checksum mismatch: %.*s expected 0x%2.2x, got 0x%2.2x", |
| (int)(pkt_size), m_bytes.c_str(), (uint8_t)packet_checksum, |
| (uint8_t)actual_checksum); |
| } |
| // Send the ack or nack if needed |
| if (!success) { |
| SendNack(); |
| m_bytes.erase(0, size_of_first_packet); |
| return false; |
| } else { |
| SendAck(); |
| } |
| } |
| |
| if (m_bytes[1] == 'N') { |
| // This packet was not compressed -- delete the 'N' character at the start |
| // and the packet may be processed as-is. |
| m_bytes.erase(1, 1); |
| return true; |
| } |
| |
| // Reverse the gdb-remote binary escaping that was done to the compressed |
| // text to guard characters like '$', '#', '}', etc. |
| std::vector<uint8_t> unescaped_content; |
| unescaped_content.reserve(content_length); |
| size_t i = content_start; |
| while (i < hash_mark_idx) { |
| if (m_bytes[i] == '}') { |
| i++; |
| unescaped_content.push_back(m_bytes[i] ^ 0x20); |
| } else { |
| unescaped_content.push_back(m_bytes[i]); |
| } |
| i++; |
| } |
| |
| uint8_t *decompressed_buffer = nullptr; |
| size_t decompressed_bytes = 0; |
| |
| if (decompressed_bufsize != ULONG_MAX) { |
| decompressed_buffer = (uint8_t *)malloc(decompressed_bufsize); |
| if (decompressed_buffer == nullptr) { |
| m_bytes.erase(0, size_of_first_packet); |
| return false; |
| } |
| } |
| |
| #if defined(HAVE_LIBCOMPRESSION) |
| if (m_compression_type == CompressionType::ZlibDeflate || |
| m_compression_type == CompressionType::LZFSE || |
| m_compression_type == CompressionType::LZ4 || |
| m_compression_type == CompressionType::LZMA) { |
| compression_algorithm compression_type; |
| if (m_compression_type == CompressionType::LZFSE) |
| compression_type = COMPRESSION_LZFSE; |
| else if (m_compression_type == CompressionType::ZlibDeflate) |
| compression_type = COMPRESSION_ZLIB; |
| else if (m_compression_type == CompressionType::LZ4) |
| compression_type = COMPRESSION_LZ4_RAW; |
| else if (m_compression_type == CompressionType::LZMA) |
| compression_type = COMPRESSION_LZMA; |
| |
| if (m_decompression_scratch_type != m_compression_type) { |
| if (m_decompression_scratch) { |
| free (m_decompression_scratch); |
| m_decompression_scratch = nullptr; |
| } |
| size_t scratchbuf_size = 0; |
| if (m_compression_type == CompressionType::LZFSE) |
| scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_LZFSE); |
| else if (m_compression_type == CompressionType::LZ4) |
| scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_LZ4_RAW); |
| else if (m_compression_type == CompressionType::ZlibDeflate) |
| scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_ZLIB); |
| else if (m_compression_type == CompressionType::LZMA) |
| scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_LZMA); |
| else if (m_compression_type == CompressionType::LZFSE) |
| scratchbuf_size = compression_decode_scratch_buffer_size (COMPRESSION_LZFSE); |
| if (scratchbuf_size > 0) { |
| m_decompression_scratch = (void*) malloc (scratchbuf_size); |
| m_decompression_scratch_type = m_compression_type; |
| } |
| } |
| |
| if (decompressed_bufsize != ULONG_MAX && decompressed_buffer != nullptr) { |
| decompressed_bytes = compression_decode_buffer( |
| decompressed_buffer, decompressed_bufsize, |
| (uint8_t *)unescaped_content.data(), unescaped_content.size(), |
| m_decompression_scratch, compression_type); |
| } |
| } |
| #endif |
| |
| #if LLVM_ENABLE_ZLIB |
| if (decompressed_bytes == 0 && decompressed_bufsize != ULONG_MAX && |
| decompressed_buffer != nullptr && |
| m_compression_type == CompressionType::ZlibDeflate) { |
| z_stream stream; |
| memset(&stream, 0, sizeof(z_stream)); |
| stream.next_in = (Bytef *)unescaped_content.data(); |
| stream.avail_in = (uInt)unescaped_content.size(); |
| stream.total_in = 0; |
| stream.next_out = (Bytef *)decompressed_buffer; |
| stream.avail_out = decompressed_bufsize; |
| stream.total_out = 0; |
| stream.zalloc = Z_NULL; |
| stream.zfree = Z_NULL; |
| stream.opaque = Z_NULL; |
| |
| if (inflateInit2(&stream, -15) == Z_OK) { |
| int status = inflate(&stream, Z_NO_FLUSH); |
| inflateEnd(&stream); |
| if (status == Z_STREAM_END) { |
| decompressed_bytes = stream.total_out; |
| } |
| } |
| } |
| #endif |
| |
| if (decompressed_bytes == 0 || decompressed_buffer == nullptr) { |
| if (decompressed_buffer) |
| free(decompressed_buffer); |
| m_bytes.erase(0, size_of_first_packet); |
| return false; |
| } |
| |
| std::string new_packet; |
| new_packet.reserve(decompressed_bytes + 6); |
| new_packet.push_back(m_bytes[0]); |
| new_packet.append((const char *)decompressed_buffer, decompressed_bytes); |
| new_packet.push_back('#'); |
| if (GetSendAcks()) { |
| uint8_t decompressed_checksum = CalculcateChecksum( |
| llvm::StringRef((const char *)decompressed_buffer, decompressed_bytes)); |
| char decompressed_checksum_str[3]; |
| snprintf(decompressed_checksum_str, 3, "%02x", decompressed_checksum); |
| new_packet.append(decompressed_checksum_str); |
| } else { |
| new_packet.push_back('0'); |
| new_packet.push_back('0'); |
| } |
| |
| m_bytes.replace(0, size_of_first_packet, new_packet.data(), |
| new_packet.size()); |
| |
| free(decompressed_buffer); |
| return true; |
| } |
| |
| GDBRemoteCommunication::PacketType |
| GDBRemoteCommunication::CheckForPacket(const uint8_t *src, size_t src_len, |
| StringExtractorGDBRemote &packet) { |
| // Put the packet data into the buffer in a thread safe fashion |
| std::lock_guard<std::recursive_mutex> guard(m_bytes_mutex); |
| |
| Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PACKETS)); |
| |
| if (src && src_len > 0) { |
| if (log && log->GetVerbose()) { |
| StreamString s; |
| LLDB_LOGF(log, "GDBRemoteCommunication::%s adding %u bytes: %.*s", |
| __FUNCTION__, (uint32_t)src_len, (uint32_t)src_len, src); |
| } |
| m_bytes.append((const char *)src, src_len); |
| } |
| |
| bool isNotifyPacket = false; |
| |
| // Parse up the packets into gdb remote packets |
| if (!m_bytes.empty()) { |
| // end_idx must be one past the last valid packet byte. Start it off with |
| // an invalid value that is the same as the current index. |
| size_t content_start = 0; |
| size_t content_length = 0; |
| size_t total_length = 0; |
| size_t checksum_idx = std::string::npos; |
| |
| // Size of packet before it is decompressed, for logging purposes |
| size_t original_packet_size = m_bytes.size(); |
| if (CompressionIsEnabled()) { |
| if (!DecompressPacket()) { |
| packet.Clear(); |
| return GDBRemoteCommunication::PacketType::Standard; |
| } |
| } |
| |
| switch (m_bytes[0]) { |
| case '+': // Look for ack |
| case '-': // Look for cancel |
| case '\x03': // ^C to halt target |
| content_length = total_length = 1; // The command is one byte long... |
| break; |
| |
| case '%': // Async notify packet |
| isNotifyPacket = true; |
| LLVM_FALLTHROUGH; |
| |
| case '$': |
| // Look for a standard gdb packet? |
| { |
| size_t hash_pos = m_bytes.find('#'); |
| if (hash_pos != std::string::npos) { |
| if (hash_pos + 2 < m_bytes.size()) { |
| checksum_idx = hash_pos + 1; |
| // Skip the dollar sign |
| content_start = 1; |
| // Don't include the # in the content or the $ in the content |
| // length |
| content_length = hash_pos - 1; |
| |
| total_length = |
| hash_pos + 3; // Skip the # and the two hex checksum bytes |
| } else { |
| // Checksum bytes aren't all here yet |
| content_length = std::string::npos; |
| } |
| } |
| } |
| break; |
| |
| default: { |
| // We have an unexpected byte and we need to flush all bad data that is |
| // in m_bytes, so we need to find the first byte that is a '+' (ACK), '-' |
| // (NACK), \x03 (CTRL+C interrupt), or '$' character (start of packet |
| // header) or of course, the end of the data in m_bytes... |
| const size_t bytes_len = m_bytes.size(); |
| bool done = false; |
| uint32_t idx; |
| for (idx = 1; !done && idx < bytes_len; ++idx) { |
| switch (m_bytes[idx]) { |
| case '+': |
| case '-': |
| case '\x03': |
| case '%': |
| case '$': |
| done = true; |
| break; |
| |
| default: |
| break; |
| } |
| } |
| LLDB_LOGF(log, "GDBRemoteCommunication::%s tossing %u junk bytes: '%.*s'", |
| __FUNCTION__, idx - 1, idx - 1, m_bytes.c_str()); |
| m_bytes.erase(0, idx - 1); |
| } break; |
| } |
| |
| if (content_length == std::string::npos) { |
| packet.Clear(); |
| return GDBRemoteCommunication::PacketType::Invalid; |
| } else if (total_length > 0) { |
| |
| // We have a valid packet... |
| assert(content_length <= m_bytes.size()); |
| assert(total_length <= m_bytes.size()); |
| assert(content_length <= total_length); |
| size_t content_end = content_start + content_length; |
| |
| bool success = true; |
| if (log) { |
| // If logging was just enabled and we have history, then dump out what |
| // we have to the log so we get the historical context. The Dump() call |
| // that logs all of the packet will set a boolean so that we don't dump |
| // this more than once |
| if (!m_history.DidDumpToLog()) |
| m_history.Dump(log); |
| |
| bool binary = false; |
| // Only detect binary for packets that start with a '$' and have a |
| // '#CC' checksum |
| if (m_bytes[0] == '$' && total_length > 4) { |
| for (size_t i = 0; !binary && i < total_length; ++i) { |
| unsigned char c = m_bytes[i]; |
| if (!llvm::isPrint(c) && !llvm::isSpace(c)) { |
| binary = true; |
| } |
| } |
| } |
| if (binary) { |
| StreamString strm; |
| // Packet header... |
| if (CompressionIsEnabled()) |
| strm.Printf("<%4" PRIu64 ":%" PRIu64 "> read packet: %c", |
| (uint64_t)original_packet_size, (uint64_t)total_length, |
| m_bytes[0]); |
| else |
| strm.Printf("<%4" PRIu64 "> read packet: %c", |
| (uint64_t)total_length, m_bytes[0]); |
| for (size_t i = content_start; i < content_end; ++i) { |
| // Remove binary escaped bytes when displaying the packet... |
| const char ch = m_bytes[i]; |
| if (ch == 0x7d) { |
| // 0x7d is the escape character. The next character is to be |
| // XOR'd with 0x20. |
| const char escapee = m_bytes[++i] ^ 0x20; |
| strm.Printf("%2.2x", escapee); |
| } else { |
| strm.Printf("%2.2x", (uint8_t)ch); |
| } |
| } |
| // Packet footer... |
| strm.Printf("%c%c%c", m_bytes[total_length - 3], |
| m_bytes[total_length - 2], m_bytes[total_length - 1]); |
| log->PutString(strm.GetString()); |
| } else { |
| if (CompressionIsEnabled()) |
| LLDB_LOGF(log, "<%4" PRIu64 ":%" PRIu64 "> read packet: %.*s", |
| (uint64_t)original_packet_size, (uint64_t)total_length, |
| (int)(total_length), m_bytes.c_str()); |
| else |
| LLDB_LOGF(log, "<%4" PRIu64 "> read packet: %.*s", |
| (uint64_t)total_length, (int)(total_length), |
| m_bytes.c_str()); |
| } |
| } |
| |
| m_history.AddPacket(m_bytes, total_length, |
| GDBRemotePacket::ePacketTypeRecv, total_length); |
| |
| // Copy the packet from m_bytes to packet_str expanding the run-length |
| // encoding in the process. |
| std ::string packet_str = |
| ExpandRLE(m_bytes.substr(content_start, content_end - content_start)); |
| packet = StringExtractorGDBRemote(packet_str); |
| |
| if (m_bytes[0] == '$' || m_bytes[0] == '%') { |
| assert(checksum_idx < m_bytes.size()); |
| if (::isxdigit(m_bytes[checksum_idx + 0]) || |
| ::isxdigit(m_bytes[checksum_idx + 1])) { |
| if (GetSendAcks()) { |
| const char *packet_checksum_cstr = &m_bytes[checksum_idx]; |
| char packet_checksum = strtol(packet_checksum_cstr, nullptr, 16); |
| char actual_checksum = CalculcateChecksum( |
| llvm::StringRef(m_bytes).slice(content_start, content_end)); |
| success = packet_checksum == actual_checksum; |
| if (!success) { |
| LLDB_LOGF(log, |
| "error: checksum mismatch: %.*s expected 0x%2.2x, " |
| "got 0x%2.2x", |
| (int)(total_length), m_bytes.c_str(), |
| (uint8_t)packet_checksum, (uint8_t)actual_checksum); |
| } |
| // Send the ack or nack if needed |
| if (!success) |
| SendNack(); |
| else |
| SendAck(); |
| } |
| } else { |
| success = false; |
| LLDB_LOGF(log, "error: invalid checksum in packet: '%s'\n", |
| m_bytes.c_str()); |
| } |
| } |
| |
| m_bytes.erase(0, total_length); |
| packet.SetFilePos(0); |
| |
| if (isNotifyPacket) |
| return GDBRemoteCommunication::PacketType::Notify; |
| else |
| return GDBRemoteCommunication::PacketType::Standard; |
| } |
| } |
| packet.Clear(); |
| return GDBRemoteCommunication::PacketType::Invalid; |
| } |
| |
| Status GDBRemoteCommunication::StartListenThread(const char *hostname, |
| uint16_t port) { |
| if (m_listen_thread.IsJoinable()) |
| return Status("listen thread already running"); |
| |
| char listen_url[512]; |
| if (hostname && hostname[0]) |
| snprintf(listen_url, sizeof(listen_url), "listen://%s:%i", hostname, port); |
| else |
| snprintf(listen_url, sizeof(listen_url), "listen://%i", port); |
| m_listen_url = listen_url; |
| SetConnection(std::make_unique<ConnectionFileDescriptor>()); |
| llvm::Expected<HostThread> listen_thread = ThreadLauncher::LaunchThread( |
| listen_url, GDBRemoteCommunication::ListenThread, this); |
| if (!listen_thread) |
| return Status(listen_thread.takeError()); |
| m_listen_thread = *listen_thread; |
| |
| return Status(); |
| } |
| |
| bool GDBRemoteCommunication::JoinListenThread() { |
| if (m_listen_thread.IsJoinable()) |
| m_listen_thread.Join(nullptr); |
| return true; |
| } |
| |
| lldb::thread_result_t |
| GDBRemoteCommunication::ListenThread(lldb::thread_arg_t arg) { |
| GDBRemoteCommunication *comm = (GDBRemoteCommunication *)arg; |
| Status error; |
| ConnectionFileDescriptor *connection = |
| (ConnectionFileDescriptor *)comm->GetConnection(); |
| |
| if (connection) { |
| // Do the listen on another thread so we can continue on... |
| if (connection->Connect( |
| comm->m_listen_url.c_str(), [comm](llvm::StringRef port_str) { |
| uint16_t port = 0; |
| llvm::to_integer(port_str, port, 10); |
| comm->m_port_promise.set_value(port); |
| }, |
| &error) != eConnectionStatusSuccess) |
| comm->SetConnection(nullptr); |
| } |
| return {}; |
| } |
| |
| Status GDBRemoteCommunication::StartDebugserverProcess( |
| const char *url, Platform *platform, ProcessLaunchInfo &launch_info, |
| uint16_t *port, const Args *inferior_args, int pass_comm_fd) { |
| Log *log(ProcessGDBRemoteLog::GetLogIfAllCategoriesSet(GDBR_LOG_PROCESS)); |
| LLDB_LOGF(log, "GDBRemoteCommunication::%s(url=%s, port=%" PRIu16 ")", |
| __FUNCTION__, url ? url : "<empty>", port ? *port : uint16_t(0)); |
| |
| Status error; |
| // If we locate debugserver, keep that located version around |
| static FileSpec g_debugserver_file_spec; |
| |
| char debugserver_path[PATH_MAX]; |
| FileSpec &debugserver_file_spec = launch_info.GetExecutableFile(); |
| |
| Environment host_env = Host::GetEnvironment(); |
| |
| // Always check to see if we have an environment override for the path to the |
| // debugserver to use and use it if we do. |
| std::string env_debugserver_path = host_env.lookup("LLDB_DEBUGSERVER_PATH"); |
| if (!env_debugserver_path.empty()) { |
| debugserver_file_spec.SetFile(env_debugserver_path, |
| FileSpec::Style::native); |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s() gdb-remote stub exe path set " |
| "from environment variable: %s", |
| __FUNCTION__, env_debugserver_path.c_str()); |
| } else |
| debugserver_file_spec = g_debugserver_file_spec; |
| bool debugserver_exists = |
| FileSystem::Instance().Exists(debugserver_file_spec); |
| if (!debugserver_exists) { |
| // The debugserver binary is in the LLDB.framework/Resources directory. |
| debugserver_file_spec = HostInfo::GetSupportExeDir(); |
| if (debugserver_file_spec) { |
| debugserver_file_spec.AppendPathComponent(DEBUGSERVER_BASENAME); |
| debugserver_exists = FileSystem::Instance().Exists(debugserver_file_spec); |
| if (debugserver_exists) { |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s() found gdb-remote stub exe '%s'", |
| __FUNCTION__, debugserver_file_spec.GetPath().c_str()); |
| |
| g_debugserver_file_spec = debugserver_file_spec; |
| } else { |
| if (platform) |
| debugserver_file_spec = |
| platform->LocateExecutable(DEBUGSERVER_BASENAME); |
| else |
| debugserver_file_spec.Clear(); |
| if (debugserver_file_spec) { |
| // Platform::LocateExecutable() wouldn't return a path if it doesn't |
| // exist |
| debugserver_exists = true; |
| } else { |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s() could not find " |
| "gdb-remote stub exe '%s'", |
| __FUNCTION__, debugserver_file_spec.GetPath().c_str()); |
| } |
| // Don't cache the platform specific GDB server binary as it could |
| // change from platform to platform |
| g_debugserver_file_spec.Clear(); |
| } |
| } |
| } |
| |
| if (debugserver_exists) { |
| debugserver_file_spec.GetPath(debugserver_path, sizeof(debugserver_path)); |
| |
| Args &debugserver_args = launch_info.GetArguments(); |
| debugserver_args.Clear(); |
| |
| // Start args with "debugserver /file/path -r --" |
| debugserver_args.AppendArgument(llvm::StringRef(debugserver_path)); |
| |
| #if !defined(__APPLE__) |
| // First argument to lldb-server must be mode in which to run. |
| debugserver_args.AppendArgument(llvm::StringRef("gdbserver")); |
| #endif |
| |
| // If a url is supplied then use it |
| if (url) |
| debugserver_args.AppendArgument(llvm::StringRef(url)); |
| |
| if (pass_comm_fd >= 0) { |
| StreamString fd_arg; |
| fd_arg.Printf("--fd=%i", pass_comm_fd); |
| debugserver_args.AppendArgument(fd_arg.GetString()); |
| // Send "pass_comm_fd" down to the inferior so it can use it to |
| // communicate back with this process |
| launch_info.AppendDuplicateFileAction(pass_comm_fd, pass_comm_fd); |
| } |
| |
| // use native registers, not the GDB registers |
| debugserver_args.AppendArgument(llvm::StringRef("--native-regs")); |
| |
| if (launch_info.GetLaunchInSeparateProcessGroup()) { |
| debugserver_args.AppendArgument(llvm::StringRef("--setsid")); |
| } |
| |
| llvm::SmallString<128> named_pipe_path; |
| // socket_pipe is used by debug server to communicate back either |
| // TCP port or domain socket name which it listens on. |
| // The second purpose of the pipe to serve as a synchronization point - |
| // once data is written to the pipe, debug server is up and running. |
| Pipe socket_pipe; |
| |
| // port is null when debug server should listen on domain socket - we're |
| // not interested in port value but rather waiting for debug server to |
| // become available. |
| if (pass_comm_fd == -1) { |
| if (url) { |
| // Create a temporary file to get the stdout/stderr and redirect the output of |
| // the command into this file. We will later read this file if all goes well |
| // and fill the data into "command_output_ptr" |
| #if defined(__APPLE__) |
| // Binding to port zero, we need to figure out what port it ends up |
| // using using a named pipe... |
| error = socket_pipe.CreateWithUniqueName("debugserver-named-pipe", |
| false, named_pipe_path); |
| if (error.Fail()) { |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s() " |
| "named pipe creation failed: %s", |
| __FUNCTION__, error.AsCString()); |
| return error; |
| } |
| debugserver_args.AppendArgument(llvm::StringRef("--named-pipe")); |
| debugserver_args.AppendArgument(named_pipe_path); |
| #else |
| // Binding to port zero, we need to figure out what port it ends up |
| // using using an unnamed pipe... |
| error = socket_pipe.CreateNew(true); |
| if (error.Fail()) { |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s() " |
| "unnamed pipe creation failed: %s", |
| __FUNCTION__, error.AsCString()); |
| return error; |
| } |
| pipe_t write = socket_pipe.GetWritePipe(); |
| debugserver_args.AppendArgument(llvm::StringRef("--pipe")); |
| debugserver_args.AppendArgument(llvm::to_string(write)); |
| launch_info.AppendCloseFileAction(socket_pipe.GetReadFileDescriptor()); |
| #endif |
| } else { |
| // No host and port given, so lets listen on our end and make the |
| // debugserver connect to us.. |
| error = StartListenThread("127.0.0.1", 0); |
| if (error.Fail()) { |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s() unable to start listen " |
| "thread: %s", |
| __FUNCTION__, error.AsCString()); |
| return error; |
| } |
| |
| // Wait for 10 seconds to resolve the bound port |
| std::future<uint16_t> port_future = m_port_promise.get_future(); |
| uint16_t port_ = port_future.wait_for(std::chrono::seconds(10)) == |
| std::future_status::ready |
| ? port_future.get() |
| : 0; |
| if (port_ > 0) { |
| char port_cstr[32]; |
| snprintf(port_cstr, sizeof(port_cstr), "127.0.0.1:%i", port_); |
| // Send the host and port down that debugserver and specify an option |
| // so that it connects back to the port we are listening to in this |
| // process |
| debugserver_args.AppendArgument(llvm::StringRef("--reverse-connect")); |
| debugserver_args.AppendArgument(llvm::StringRef(port_cstr)); |
| if (port) |
| *port = port_; |
| } else { |
| error.SetErrorString("failed to bind to port 0 on 127.0.0.1"); |
| LLDB_LOGF(log, "GDBRemoteCommunication::%s() failed: %s", |
| __FUNCTION__, error.AsCString()); |
| return error; |
| } |
| } |
| } |
| std::string env_debugserver_log_file = |
| host_env.lookup("LLDB_DEBUGSERVER_LOG_FILE"); |
| if (!env_debugserver_log_file.empty()) { |
| debugserver_args.AppendArgument( |
| llvm::formatv("--log-file={0}", env_debugserver_log_file).str()); |
| } |
| |
| #if defined(__APPLE__) |
| const char *env_debugserver_log_flags = |
| getenv("LLDB_DEBUGSERVER_LOG_FLAGS"); |
| if (env_debugserver_log_flags) { |
| debugserver_args.AppendArgument( |
| llvm::formatv("--log-flags={0}", env_debugserver_log_flags).str()); |
| } |
| #else |
| std::string env_debugserver_log_channels = |
| host_env.lookup("LLDB_SERVER_LOG_CHANNELS"); |
| if (!env_debugserver_log_channels.empty()) { |
| debugserver_args.AppendArgument( |
| llvm::formatv("--log-channels={0}", env_debugserver_log_channels) |
| .str()); |
| } |
| #endif |
| |
| // Add additional args, starting with LLDB_DEBUGSERVER_EXTRA_ARG_1 until an |
| // env var doesn't come back. |
| uint32_t env_var_index = 1; |
| bool has_env_var; |
| do { |
| char env_var_name[64]; |
| snprintf(env_var_name, sizeof(env_var_name), |
| "LLDB_DEBUGSERVER_EXTRA_ARG_%" PRIu32, env_var_index++); |
| std::string extra_arg = host_env.lookup(env_var_name); |
| has_env_var = !extra_arg.empty(); |
| |
| if (has_env_var) { |
| debugserver_args.AppendArgument(llvm::StringRef(extra_arg)); |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s adding env var %s contents " |
| "to stub command line (%s)", |
| __FUNCTION__, env_var_name, extra_arg.c_str()); |
| } |
| } while (has_env_var); |
| |
| if (inferior_args && inferior_args->GetArgumentCount() > 0) { |
| debugserver_args.AppendArgument(llvm::StringRef("--")); |
| debugserver_args.AppendArguments(*inferior_args); |
| } |
| |
| // Copy the current environment to the gdbserver/debugserver instance |
| launch_info.GetEnvironment() = host_env; |
| |
| // Close STDIN, STDOUT and STDERR. |
| launch_info.AppendCloseFileAction(STDIN_FILENO); |
| launch_info.AppendCloseFileAction(STDOUT_FILENO); |
| launch_info.AppendCloseFileAction(STDERR_FILENO); |
| |
| // Redirect STDIN, STDOUT and STDERR to "/dev/null". |
| launch_info.AppendSuppressFileAction(STDIN_FILENO, true, false); |
| launch_info.AppendSuppressFileAction(STDOUT_FILENO, false, true); |
| launch_info.AppendSuppressFileAction(STDERR_FILENO, false, true); |
| |
| if (log) { |
| StreamString string_stream; |
| Platform *const platform = nullptr; |
| launch_info.Dump(string_stream, platform); |
| LLDB_LOGF(log, "launch info for gdb-remote stub:\n%s", |
| string_stream.GetData()); |
| } |
| error = Host::LaunchProcess(launch_info); |
| |
| if (error.Success() && |
| (launch_info.GetProcessID() != LLDB_INVALID_PROCESS_ID) && |
| pass_comm_fd == -1) { |
| if (named_pipe_path.size() > 0) { |
| error = socket_pipe.OpenAsReader(named_pipe_path, false); |
| if (error.Fail()) |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s() " |
| "failed to open named pipe %s for reading: %s", |
| __FUNCTION__, named_pipe_path.c_str(), error.AsCString()); |
| } |
| |
| if (socket_pipe.CanWrite()) |
| socket_pipe.CloseWriteFileDescriptor(); |
| if (socket_pipe.CanRead()) { |
| char port_cstr[PATH_MAX] = {0}; |
| port_cstr[0] = '\0'; |
| size_t num_bytes = sizeof(port_cstr); |
| // Read port from pipe with 10 second timeout. |
| error = socket_pipe.ReadWithTimeout( |
| port_cstr, num_bytes, std::chrono::seconds{10}, num_bytes); |
| if (error.Success() && (port != nullptr)) { |
| assert(num_bytes > 0 && port_cstr[num_bytes - 1] == '\0'); |
| uint16_t child_port = 0; |
| // FIXME: improve error handling |
| llvm::to_integer(port_cstr, child_port); |
| if (*port == 0 || *port == child_port) { |
| *port = child_port; |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s() " |
| "debugserver listens %u port", |
| __FUNCTION__, *port); |
| } else { |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s() " |
| "debugserver listening on port " |
| "%d but requested port was %d", |
| __FUNCTION__, (uint32_t)child_port, (uint32_t)(*port)); |
| } |
| } else { |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s() " |
| "failed to read a port value from pipe %s: %s", |
| __FUNCTION__, named_pipe_path.c_str(), error.AsCString()); |
| } |
| socket_pipe.Close(); |
| } |
| |
| if (named_pipe_path.size() > 0) { |
| const auto err = socket_pipe.Delete(named_pipe_path); |
| if (err.Fail()) { |
| LLDB_LOGF(log, |
| "GDBRemoteCommunication::%s failed to delete pipe %s: %s", |
| __FUNCTION__, named_pipe_path.c_str(), err.AsCString()); |
| } |
| } |
| |
| // Make sure we actually connect with the debugserver... |
| JoinListenThread(); |
| } |
| } else { |
| error.SetErrorStringWithFormat("unable to locate " DEBUGSERVER_BASENAME); |
| } |
| |
| if (error.Fail()) { |
| LLDB_LOGF(log, "GDBRemoteCommunication::%s() failed: %s", __FUNCTION__, |
| error.AsCString()); |
| } |
| |
| return error; |
| } |
| |
| void GDBRemoteCommunication::DumpHistory(Stream &strm) { m_history.Dump(strm); } |
| |
| void GDBRemoteCommunication::SetPacketRecorder( |
| repro::PacketRecorder *recorder) { |
| m_history.SetRecorder(recorder); |
| } |
| |
| llvm::Error |
| GDBRemoteCommunication::ConnectLocally(GDBRemoteCommunication &client, |
| GDBRemoteCommunication &server) { |
| const bool child_processes_inherit = false; |
| const int backlog = 5; |
| TCPSocket listen_socket(true, child_processes_inherit); |
| if (llvm::Error error = |
| listen_socket.Listen("localhost:0", backlog).ToError()) |
| return error; |
| |
| Socket *accept_socket; |
| std::future<Status> accept_status = std::async( |
| std::launch::async, [&] { return listen_socket.Accept(accept_socket); }); |
| |
| llvm::SmallString<32> remote_addr; |
| llvm::raw_svector_ostream(remote_addr) |
| << "connect://localhost:" << listen_socket.GetLocalPortNumber(); |
| |
| std::unique_ptr<ConnectionFileDescriptor> conn_up( |
| new ConnectionFileDescriptor()); |
| Status status; |
| if (conn_up->Connect(remote_addr, &status) != lldb::eConnectionStatusSuccess) |
| return llvm::createStringError(llvm::inconvertibleErrorCode(), |
| "Unable to connect: %s", status.AsCString()); |
| |
| client.SetConnection(std::move(conn_up)); |
| if (llvm::Error error = accept_status.get().ToError()) |
| return error; |
| |
| server.SetConnection( |
| std::make_unique<ConnectionFileDescriptor>(accept_socket)); |
| return llvm::Error::success(); |
| } |
| |
| GDBRemoteCommunication::ScopedTimeout::ScopedTimeout( |
| GDBRemoteCommunication &gdb_comm, std::chrono::seconds timeout) |
| : m_gdb_comm(gdb_comm), m_timeout_modified(false) { |
| auto curr_timeout = gdb_comm.GetPacketTimeout(); |
| // Only update the timeout if the timeout is greater than the current |
| // timeout. If the current timeout is larger, then just use that. |
| if (curr_timeout < timeout) { |
| m_timeout_modified = true; |
| m_saved_timeout = m_gdb_comm.SetPacketTimeout(timeout); |
| } |
| } |
| |
| GDBRemoteCommunication::ScopedTimeout::~ScopedTimeout() { |
| // Only restore the timeout if we set it in the constructor. |
| if (m_timeout_modified) |
| m_gdb_comm.SetPacketTimeout(m_saved_timeout); |
| } |
| |
| void llvm::format_provider<GDBRemoteCommunication::PacketResult>::format( |
| const GDBRemoteCommunication::PacketResult &result, raw_ostream &Stream, |
| StringRef Style) { |
| using PacketResult = GDBRemoteCommunication::PacketResult; |
| |
| switch (result) { |
| case PacketResult::Success: |
| Stream << "Success"; |
| break; |
| case PacketResult::ErrorSendFailed: |
| Stream << "ErrorSendFailed"; |
| break; |
| case PacketResult::ErrorSendAck: |
| Stream << "ErrorSendAck"; |
| break; |
| case PacketResult::ErrorReplyFailed: |
| Stream << "ErrorReplyFailed"; |
| break; |
| case PacketResult::ErrorReplyTimeout: |
| Stream << "ErrorReplyTimeout"; |
| break; |
| case PacketResult::ErrorReplyInvalid: |
| Stream << "ErrorReplyInvalid"; |
| break; |
| case PacketResult::ErrorReplyAck: |
| Stream << "ErrorReplyAck"; |
| break; |
| case PacketResult::ErrorDisconnected: |
| Stream << "ErrorDisconnected"; |
| break; |
| case PacketResult::ErrorNoSequenceLock: |
| Stream << "ErrorNoSequenceLock"; |
| break; |
| } |
| } |
| |
| std::string GDBRemoteCommunication::ExpandRLE(std::string packet) { |
| // Reserve enough byte for the most common case (no RLE used). |
| std::string decoded; |
| decoded.reserve(packet.size()); |
| for (std::string::const_iterator c = packet.begin(); c != packet.end(); ++c) { |
| if (*c == '*') { |
| // '*' indicates RLE. Next character will give us the repeat count and |
| // previous character is what is to be repeated. |
| char char_to_repeat = decoded.back(); |
| // Number of time the previous character is repeated. |
| int repeat_count = *++c + 3 - ' '; |
| // We have the char_to_repeat and repeat_count. Now push it in the |
| // packet. |
| for (int i = 0; i < repeat_count; ++i) |
| decoded.push_back(char_to_repeat); |
| } else if (*c == 0x7d) { |
| // 0x7d is the escape character. The next character is to be XOR'd with |
| // 0x20. |
| char escapee = *++c ^ 0x20; |
| decoded.push_back(escapee); |
| } else { |
| decoded.push_back(*c); |
| } |
| } |
| return decoded; |
| } |
