1 //===-- GDBRemoteCommunication.cpp ------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 11 #include "GDBRemoteCommunication.h" 12 13 // C Includes 14 #include <limits.h> 15 #include <string.h> 16 #include <sys/stat.h> 17 18 // C++ Includes 19 // Other libraries and framework includes 20 #include "lldb/Core/Log.h" 21 #include "lldb/Core/StreamFile.h" 22 #include "lldb/Core/StreamString.h" 23 #include "lldb/Host/ConnectionFileDescriptor.h" 24 #include "lldb/Host/FileSpec.h" 25 #include "lldb/Host/Host.h" 26 #include "lldb/Host/HostInfo.h" 27 #include "lldb/Host/Pipe.h" 28 #include "lldb/Host/Socket.h" 29 #include "lldb/Host/StringConvert.h" 30 #include "lldb/Host/ThreadLauncher.h" 31 #include "lldb/Host/TimeValue.h" 32 #include "lldb/Target/Process.h" 33 #include "llvm/ADT/SmallString.h" 34 35 // Project includes 36 #include "ProcessGDBRemoteLog.h" 37 38 #if defined(__APPLE__) 39 # define DEBUGSERVER_BASENAME "debugserver" 40 #else 41 # define DEBUGSERVER_BASENAME "lldb-server" 42 #endif 43 44 using namespace lldb; 45 using namespace lldb_private; 46 using namespace lldb_private::process_gdb_remote; 47 48 GDBRemoteCommunication::History::History (uint32_t size) : 49 m_packets(), 50 m_curr_idx (0), 51 m_total_packet_count (0), 52 m_dumped_to_log (false) 53 { 54 m_packets.resize(size); 55 } 56 57 GDBRemoteCommunication::History::~History () 58 { 59 } 60 61 void 62 GDBRemoteCommunication::History::AddPacket (char packet_char, 63 PacketType type, 64 uint32_t bytes_transmitted) 65 { 66 const size_t size = m_packets.size(); 67 if (size > 0) 68 { 69 const uint32_t idx = GetNextIndex(); 70 m_packets[idx].packet.assign (1, packet_char); 71 m_packets[idx].type = type; 72 m_packets[idx].bytes_transmitted = bytes_transmitted; 73 m_packets[idx].packet_idx = m_total_packet_count; 74 m_packets[idx].tid = Host::GetCurrentThreadID(); 75 } 76 } 77 78 void 79 GDBRemoteCommunication::History::AddPacket (const std::string &src, 80 uint32_t src_len, 81 PacketType type, 82 uint32_t bytes_transmitted) 83 { 84 const size_t size = m_packets.size(); 85 if (size > 0) 86 { 87 const uint32_t idx = GetNextIndex(); 88 m_packets[idx].packet.assign (src, 0, src_len); 89 m_packets[idx].type = type; 90 m_packets[idx].bytes_transmitted = bytes_transmitted; 91 m_packets[idx].packet_idx = m_total_packet_count; 92 m_packets[idx].tid = Host::GetCurrentThreadID(); 93 } 94 } 95 96 void 97 GDBRemoteCommunication::History::Dump (Stream &strm) const 98 { 99 const uint32_t size = GetNumPacketsInHistory (); 100 const uint32_t first_idx = GetFirstSavedPacketIndex (); 101 const uint32_t stop_idx = m_curr_idx + size; 102 for (uint32_t i = first_idx; i < stop_idx; ++i) 103 { 104 const uint32_t idx = NormalizeIndex (i); 105 const Entry &entry = m_packets[idx]; 106 if (entry.type == ePacketTypeInvalid || entry.packet.empty()) 107 break; 108 strm.Printf ("history[%u] tid=0x%4.4" PRIx64 " <%4u> %s packet: %s\n", 109 entry.packet_idx, 110 entry.tid, 111 entry.bytes_transmitted, 112 (entry.type == ePacketTypeSend) ? "send" : "read", 113 entry.packet.c_str()); 114 } 115 } 116 117 void 118 GDBRemoteCommunication::History::Dump (Log *log) const 119 { 120 if (log && !m_dumped_to_log) 121 { 122 m_dumped_to_log = true; 123 const uint32_t size = GetNumPacketsInHistory (); 124 const uint32_t first_idx = GetFirstSavedPacketIndex (); 125 const uint32_t stop_idx = m_curr_idx + size; 126 for (uint32_t i = first_idx; i < stop_idx; ++i) 127 { 128 const uint32_t idx = NormalizeIndex (i); 129 const Entry &entry = m_packets[idx]; 130 if (entry.type == ePacketTypeInvalid || entry.packet.empty()) 131 break; 132 log->Printf ("history[%u] tid=0x%4.4" PRIx64 " <%4u> %s packet: %s", 133 entry.packet_idx, 134 entry.tid, 135 entry.bytes_transmitted, 136 (entry.type == ePacketTypeSend) ? "send" : "read", 137 entry.packet.c_str()); 138 } 139 } 140 } 141 142 //---------------------------------------------------------------------- 143 // GDBRemoteCommunication constructor 144 //---------------------------------------------------------------------- 145 GDBRemoteCommunication::GDBRemoteCommunication(const char *comm_name, 146 const char *listener_name) : 147 Communication(comm_name), 148 #ifdef LLDB_CONFIGURATION_DEBUG 149 m_packet_timeout (1000), 150 #else 151 m_packet_timeout (1), 152 #endif 153 m_sequence_mutex (Mutex::eMutexTypeRecursive), 154 m_public_is_running (false), 155 m_private_is_running (false), 156 m_history (512), 157 m_send_acks (true), 158 m_listen_url () 159 { 160 } 161 162 //---------------------------------------------------------------------- 163 // Destructor 164 //---------------------------------------------------------------------- 165 GDBRemoteCommunication::~GDBRemoteCommunication() 166 { 167 if (IsConnected()) 168 { 169 Disconnect(); 170 } 171 } 172 173 char 174 GDBRemoteCommunication::CalculcateChecksum (const char *payload, size_t payload_length) 175 { 176 int checksum = 0; 177 178 for (size_t i = 0; i < payload_length; ++i) 179 checksum += payload[i]; 180 181 return checksum & 255; 182 } 183 184 size_t 185 GDBRemoteCommunication::SendAck () 186 { 187 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS)); 188 ConnectionStatus status = eConnectionStatusSuccess; 189 char ch = '+'; 190 const size_t bytes_written = Write (&ch, 1, status, NULL); 191 if (log) 192 log->Printf ("<%4" PRIu64 "> send packet: %c", (uint64_t)bytes_written, ch); 193 m_history.AddPacket (ch, History::ePacketTypeSend, bytes_written); 194 return bytes_written; 195 } 196 197 size_t 198 GDBRemoteCommunication::SendNack () 199 { 200 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS)); 201 ConnectionStatus status = eConnectionStatusSuccess; 202 char ch = '-'; 203 const size_t bytes_written = Write (&ch, 1, status, NULL); 204 if (log) 205 log->Printf("<%4" PRIu64 "> send packet: %c", (uint64_t)bytes_written, ch); 206 m_history.AddPacket (ch, History::ePacketTypeSend, bytes_written); 207 return bytes_written; 208 } 209 210 GDBRemoteCommunication::PacketResult 211 GDBRemoteCommunication::SendPacket (const char *payload, size_t payload_length) 212 { 213 Mutex::Locker locker(m_sequence_mutex); 214 return SendPacketNoLock (payload, payload_length); 215 } 216 217 GDBRemoteCommunication::PacketResult 218 GDBRemoteCommunication::SendPacketNoLock (const char *payload, size_t payload_length) 219 { 220 if (IsConnected()) 221 { 222 StreamString packet(0, 4, eByteOrderBig); 223 224 packet.PutChar('$'); 225 packet.Write (payload, payload_length); 226 packet.PutChar('#'); 227 packet.PutHex8(CalculcateChecksum (payload, payload_length)); 228 229 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS)); 230 ConnectionStatus status = eConnectionStatusSuccess; 231 const char *packet_data = packet.GetData(); 232 const size_t packet_length = packet.GetSize(); 233 size_t bytes_written = Write (packet_data, packet_length, status, NULL); 234 if (log) 235 { 236 size_t binary_start_offset = 0; 237 if (strncmp(packet_data, "$vFile:pwrite:", strlen("$vFile:pwrite:")) == 0) 238 { 239 const char *first_comma = strchr(packet_data, ','); 240 if (first_comma) 241 { 242 const char *second_comma = strchr(first_comma + 1, ','); 243 if (second_comma) 244 binary_start_offset = second_comma - packet_data + 1; 245 } 246 } 247 248 // If logging was just enabled and we have history, then dump out what 249 // we have to the log so we get the historical context. The Dump() call that 250 // logs all of the packet will set a boolean so that we don't dump this more 251 // than once 252 if (!m_history.DidDumpToLog ()) 253 m_history.Dump (log); 254 255 if (binary_start_offset) 256 { 257 StreamString strm; 258 // Print non binary data header 259 strm.Printf("<%4" PRIu64 "> send packet: %.*s", (uint64_t)bytes_written, (int)binary_start_offset, packet_data); 260 const uint8_t *p; 261 // Print binary data exactly as sent 262 for (p = (uint8_t*)packet_data + binary_start_offset; *p != '#'; ++p) 263 strm.Printf("\\x%2.2x", *p); 264 // Print the checksum 265 strm.Printf("%*s", (int)3, p); 266 log->PutCString(strm.GetString().c_str()); 267 } 268 else 269 log->Printf("<%4" PRIu64 "> send packet: %.*s", (uint64_t)bytes_written, (int)packet_length, packet_data); 270 } 271 272 m_history.AddPacket (packet.GetString(), packet_length, History::ePacketTypeSend, bytes_written); 273 274 275 if (bytes_written == packet_length) 276 { 277 if (GetSendAcks ()) 278 return GetAck (); 279 else 280 return PacketResult::Success; 281 } 282 else 283 { 284 if (log) 285 log->Printf ("error: failed to send packet: %.*s", (int)packet_length, packet_data); 286 } 287 } 288 return PacketResult::ErrorSendFailed; 289 } 290 291 GDBRemoteCommunication::PacketResult 292 GDBRemoteCommunication::GetAck () 293 { 294 StringExtractorGDBRemote packet; 295 PacketResult result = WaitForPacketWithTimeoutMicroSecondsNoLock (packet, GetPacketTimeoutInMicroSeconds ()); 296 if (result == PacketResult::Success) 297 { 298 if (packet.GetResponseType() == StringExtractorGDBRemote::ResponseType::eAck) 299 return PacketResult::Success; 300 else 301 return PacketResult::ErrorSendAck; 302 } 303 return result; 304 } 305 306 bool 307 GDBRemoteCommunication::GetSequenceMutex (Mutex::Locker& locker, const char *failure_message) 308 { 309 if (IsRunning()) 310 return locker.TryLock (m_sequence_mutex, failure_message); 311 312 locker.Lock (m_sequence_mutex); 313 return true; 314 } 315 316 317 bool 318 GDBRemoteCommunication::WaitForNotRunningPrivate (const TimeValue *timeout_ptr) 319 { 320 return m_private_is_running.WaitForValueEqualTo (false, timeout_ptr, NULL); 321 } 322 323 GDBRemoteCommunication::PacketResult 324 GDBRemoteCommunication::WaitForPacketWithTimeoutMicroSecondsNoLock (StringExtractorGDBRemote &packet, uint32_t timeout_usec) 325 { 326 uint8_t buffer[8192]; 327 Error error; 328 329 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS | GDBR_LOG_VERBOSE)); 330 331 // Check for a packet from our cache first without trying any reading... 332 if (CheckForPacket (NULL, 0, packet)) 333 return PacketResult::Success; 334 335 bool timed_out = false; 336 bool disconnected = false; 337 while (IsConnected() && !timed_out) 338 { 339 lldb::ConnectionStatus status = eConnectionStatusNoConnection; 340 size_t bytes_read = Read (buffer, sizeof(buffer), timeout_usec, status, &error); 341 342 if (log) 343 log->Printf ("%s: Read (buffer, (sizeof(buffer), timeout_usec = 0x%x, status = %s, error = %s) => bytes_read = %" PRIu64, 344 __PRETTY_FUNCTION__, 345 timeout_usec, 346 Communication::ConnectionStatusAsCString (status), 347 error.AsCString(), 348 (uint64_t)bytes_read); 349 350 if (bytes_read > 0) 351 { 352 if (CheckForPacket (buffer, bytes_read, packet)) 353 return PacketResult::Success; 354 } 355 else 356 { 357 switch (status) 358 { 359 case eConnectionStatusTimedOut: 360 case eConnectionStatusInterrupted: 361 timed_out = true; 362 break; 363 case eConnectionStatusSuccess: 364 //printf ("status = success but error = %s\n", error.AsCString("<invalid>")); 365 break; 366 367 case eConnectionStatusEndOfFile: 368 case eConnectionStatusNoConnection: 369 case eConnectionStatusLostConnection: 370 case eConnectionStatusError: 371 disconnected = true; 372 Disconnect(); 373 break; 374 } 375 } 376 } 377 packet.Clear (); 378 if (disconnected) 379 return PacketResult::ErrorDisconnected; 380 if (timed_out) 381 return PacketResult::ErrorReplyTimeout; 382 else 383 return PacketResult::ErrorReplyFailed; 384 } 385 386 bool 387 GDBRemoteCommunication::CheckForPacket (const uint8_t *src, size_t src_len, StringExtractorGDBRemote &packet) 388 { 389 // Put the packet data into the buffer in a thread safe fashion 390 Mutex::Locker locker(m_bytes_mutex); 391 392 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS)); 393 394 if (src && src_len > 0) 395 { 396 if (log && log->GetVerbose()) 397 { 398 StreamString s; 399 log->Printf ("GDBRemoteCommunication::%s adding %u bytes: %.*s", 400 __FUNCTION__, 401 (uint32_t)src_len, 402 (uint32_t)src_len, 403 src); 404 } 405 m_bytes.append ((const char *)src, src_len); 406 } 407 408 // Parse up the packets into gdb remote packets 409 if (!m_bytes.empty()) 410 { 411 // end_idx must be one past the last valid packet byte. Start 412 // it off with an invalid value that is the same as the current 413 // index. 414 size_t content_start = 0; 415 size_t content_length = 0; 416 size_t total_length = 0; 417 size_t checksum_idx = std::string::npos; 418 419 switch (m_bytes[0]) 420 { 421 case '+': // Look for ack 422 case '-': // Look for cancel 423 case '\x03': // ^C to halt target 424 content_length = total_length = 1; // The command is one byte long... 425 break; 426 427 case '$': 428 // Look for a standard gdb packet? 429 { 430 size_t hash_pos = m_bytes.find('#'); 431 if (hash_pos != std::string::npos) 432 { 433 if (hash_pos + 2 < m_bytes.size()) 434 { 435 checksum_idx = hash_pos + 1; 436 // Skip the dollar sign 437 content_start = 1; 438 // Don't include the # in the content or the $ in the content length 439 content_length = hash_pos - 1; 440 441 total_length = hash_pos + 3; // Skip the # and the two hex checksum bytes 442 } 443 else 444 { 445 // Checksum bytes aren't all here yet 446 content_length = std::string::npos; 447 } 448 } 449 } 450 break; 451 452 default: 453 { 454 // We have an unexpected byte and we need to flush all bad 455 // data that is in m_bytes, so we need to find the first 456 // byte that is a '+' (ACK), '-' (NACK), \x03 (CTRL+C interrupt), 457 // or '$' character (start of packet header) or of course, 458 // the end of the data in m_bytes... 459 const size_t bytes_len = m_bytes.size(); 460 bool done = false; 461 uint32_t idx; 462 for (idx = 1; !done && idx < bytes_len; ++idx) 463 { 464 switch (m_bytes[idx]) 465 { 466 case '+': 467 case '-': 468 case '\x03': 469 case '$': 470 done = true; 471 break; 472 473 default: 474 break; 475 } 476 } 477 if (log) 478 log->Printf ("GDBRemoteCommunication::%s tossing %u junk bytes: '%.*s'", 479 __FUNCTION__, idx - 1, idx - 1, m_bytes.c_str()); 480 m_bytes.erase(0, idx - 1); 481 } 482 break; 483 } 484 485 if (content_length == std::string::npos) 486 { 487 packet.Clear(); 488 return false; 489 } 490 else if (total_length > 0) 491 { 492 493 // We have a valid packet... 494 assert (content_length <= m_bytes.size()); 495 assert (total_length <= m_bytes.size()); 496 assert (content_length <= total_length); 497 const size_t content_end = content_start + content_length; 498 499 bool success = true; 500 std::string &packet_str = packet.GetStringRef(); 501 502 503 if (log) 504 { 505 // If logging was just enabled and we have history, then dump out what 506 // we have to the log so we get the historical context. The Dump() call that 507 // logs all of the packet will set a boolean so that we don't dump this more 508 // than once 509 if (!m_history.DidDumpToLog ()) 510 m_history.Dump (log); 511 512 bool binary = false; 513 // Only detect binary for packets that start with a '$' and have a '#CC' checksum 514 if (m_bytes[0] == '$' && total_length > 4) 515 { 516 for (size_t i=0; !binary && i<total_length; ++i) 517 { 518 if (isprint(m_bytes[i]) == 0) 519 binary = true; 520 } 521 } 522 if (binary) 523 { 524 StreamString strm; 525 // Packet header... 526 strm.Printf("<%4" PRIu64 "> read packet: %c", (uint64_t)total_length, m_bytes[0]); 527 for (size_t i=content_start; i<content_end; ++i) 528 { 529 // Remove binary escaped bytes when displaying the packet... 530 const char ch = m_bytes[i]; 531 if (ch == 0x7d) 532 { 533 // 0x7d is the escape character. The next character is to 534 // be XOR'd with 0x20. 535 const char escapee = m_bytes[++i] ^ 0x20; 536 strm.Printf("%2.2x", escapee); 537 } 538 else 539 { 540 strm.Printf("%2.2x", (uint8_t)ch); 541 } 542 } 543 // Packet footer... 544 strm.Printf("%c%c%c", m_bytes[total_length-3], m_bytes[total_length-2], m_bytes[total_length-1]); 545 log->PutCString(strm.GetString().c_str()); 546 } 547 else 548 { 549 log->Printf("<%4" PRIu64 "> read packet: %.*s", (uint64_t)total_length, (int)(total_length), m_bytes.c_str()); 550 } 551 } 552 553 m_history.AddPacket (m_bytes.c_str(), total_length, History::ePacketTypeRecv, total_length); 554 555 // Clear packet_str in case there is some existing data in it. 556 packet_str.clear(); 557 // Copy the packet from m_bytes to packet_str expanding the 558 // run-length encoding in the process. 559 // Reserve enough byte for the most common case (no RLE used) 560 packet_str.reserve(m_bytes.length()); 561 for (std::string::const_iterator c = m_bytes.begin() + content_start; c != m_bytes.begin() + content_end; ++c) 562 { 563 if (*c == '*') 564 { 565 // '*' indicates RLE. Next character will give us the 566 // repeat count and previous character is what is to be 567 // repeated. 568 char char_to_repeat = packet_str.back(); 569 // Number of time the previous character is repeated 570 int repeat_count = *++c + 3 - ' '; 571 // We have the char_to_repeat and repeat_count. Now push 572 // it in the packet. 573 for (int i = 0; i < repeat_count; ++i) 574 packet_str.push_back(char_to_repeat); 575 } 576 else if (*c == 0x7d) 577 { 578 // 0x7d is the escape character. The next character is to 579 // be XOR'd with 0x20. 580 char escapee = *++c ^ 0x20; 581 packet_str.push_back(escapee); 582 } 583 else 584 { 585 packet_str.push_back(*c); 586 } 587 } 588 589 if (m_bytes[0] == '$') 590 { 591 assert (checksum_idx < m_bytes.size()); 592 if (::isxdigit (m_bytes[checksum_idx+0]) || 593 ::isxdigit (m_bytes[checksum_idx+1])) 594 { 595 if (GetSendAcks ()) 596 { 597 const char *packet_checksum_cstr = &m_bytes[checksum_idx]; 598 char packet_checksum = strtol (packet_checksum_cstr, NULL, 16); 599 char actual_checksum = CalculcateChecksum (packet_str.c_str(), packet_str.size()); 600 success = packet_checksum == actual_checksum; 601 if (!success) 602 { 603 if (log) 604 log->Printf ("error: checksum mismatch: %.*s expected 0x%2.2x, got 0x%2.2x", 605 (int)(total_length), 606 m_bytes.c_str(), 607 (uint8_t)packet_checksum, 608 (uint8_t)actual_checksum); 609 } 610 // Send the ack or nack if needed 611 if (!success) 612 SendNack(); 613 else 614 SendAck(); 615 } 616 } 617 else 618 { 619 success = false; 620 if (log) 621 log->Printf ("error: invalid checksum in packet: '%s'\n", m_bytes.c_str()); 622 } 623 } 624 625 m_bytes.erase(0, total_length); 626 packet.SetFilePos(0); 627 return success; 628 } 629 } 630 packet.Clear(); 631 return false; 632 } 633 634 Error 635 GDBRemoteCommunication::StartListenThread (const char *hostname, uint16_t port) 636 { 637 Error error; 638 if (m_listen_thread.IsJoinable()) 639 { 640 error.SetErrorString("listen thread already running"); 641 } 642 else 643 { 644 char listen_url[512]; 645 if (hostname && hostname[0]) 646 snprintf(listen_url, sizeof(listen_url), "listen://%s:%i", hostname, port); 647 else 648 snprintf(listen_url, sizeof(listen_url), "listen://%i", port); 649 m_listen_url = listen_url; 650 SetConnection(new ConnectionFileDescriptor()); 651 m_listen_thread = ThreadLauncher::LaunchThread(listen_url, GDBRemoteCommunication::ListenThread, this, &error); 652 } 653 return error; 654 } 655 656 bool 657 GDBRemoteCommunication::JoinListenThread () 658 { 659 if (m_listen_thread.IsJoinable()) 660 m_listen_thread.Join(nullptr); 661 return true; 662 } 663 664 lldb::thread_result_t 665 GDBRemoteCommunication::ListenThread (lldb::thread_arg_t arg) 666 { 667 GDBRemoteCommunication *comm = (GDBRemoteCommunication *)arg; 668 Error error; 669 ConnectionFileDescriptor *connection = (ConnectionFileDescriptor *)comm->GetConnection (); 670 671 if (connection) 672 { 673 // Do the listen on another thread so we can continue on... 674 if (connection->Connect(comm->m_listen_url.c_str(), &error) != eConnectionStatusSuccess) 675 comm->SetConnection(NULL); 676 } 677 return NULL; 678 } 679 680 Error 681 GDBRemoteCommunication::StartDebugserverProcess (const char *hostname, 682 uint16_t in_port, 683 ProcessLaunchInfo &launch_info, 684 uint16_t &out_port) 685 { 686 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PROCESS)); 687 if (log) 688 log->Printf ("GDBRemoteCommunication::%s(hostname=%s, in_port=%" PRIu16 ", out_port=%" PRIu16, __FUNCTION__, hostname ? hostname : "<empty>", in_port, out_port); 689 690 out_port = in_port; 691 Error error; 692 // If we locate debugserver, keep that located version around 693 static FileSpec g_debugserver_file_spec; 694 695 char debugserver_path[PATH_MAX]; 696 FileSpec &debugserver_file_spec = launch_info.GetExecutableFile(); 697 698 // Always check to see if we have an environment override for the path 699 // to the debugserver to use and use it if we do. 700 const char *env_debugserver_path = getenv("LLDB_DEBUGSERVER_PATH"); 701 if (env_debugserver_path) 702 { 703 debugserver_file_spec.SetFile (env_debugserver_path, false); 704 if (log) 705 log->Printf ("GDBRemoteCommunication::%s() gdb-remote stub exe path set from environment variable: %s", __FUNCTION__, env_debugserver_path); 706 } 707 else 708 debugserver_file_spec = g_debugserver_file_spec; 709 bool debugserver_exists = debugserver_file_spec.Exists(); 710 if (!debugserver_exists) 711 { 712 // The debugserver binary is in the LLDB.framework/Resources 713 // directory. 714 if (HostInfo::GetLLDBPath(ePathTypeSupportExecutableDir, debugserver_file_spec)) 715 { 716 debugserver_file_spec.AppendPathComponent (DEBUGSERVER_BASENAME); 717 debugserver_exists = debugserver_file_spec.Exists(); 718 if (debugserver_exists) 719 { 720 if (log) 721 log->Printf ("GDBRemoteCommunication::%s() found gdb-remote stub exe '%s'", __FUNCTION__, debugserver_file_spec.GetPath ().c_str ()); 722 723 g_debugserver_file_spec = debugserver_file_spec; 724 } 725 else 726 { 727 if (log) 728 log->Printf ("GDBRemoteCommunication::%s() could not find gdb-remote stub exe '%s'", __FUNCTION__, debugserver_file_spec.GetPath ().c_str ()); 729 730 g_debugserver_file_spec.Clear(); 731 debugserver_file_spec.Clear(); 732 } 733 } 734 } 735 736 if (debugserver_exists) 737 { 738 debugserver_file_spec.GetPath (debugserver_path, sizeof(debugserver_path)); 739 740 Args &debugserver_args = launch_info.GetArguments(); 741 debugserver_args.Clear(); 742 char arg_cstr[PATH_MAX]; 743 744 // Start args with "debugserver /file/path -r --" 745 debugserver_args.AppendArgument(debugserver_path); 746 747 #if !defined(__APPLE__) 748 // First argument to lldb-server must be mode in which to run. 749 debugserver_args.AppendArgument("gdbserver"); 750 #endif 751 752 // If a host and port is supplied then use it 753 char host_and_port[128]; 754 if (hostname) 755 { 756 snprintf (host_and_port, sizeof(host_and_port), "%s:%u", hostname, in_port); 757 debugserver_args.AppendArgument(host_and_port); 758 } 759 else 760 { 761 host_and_port[0] = '\0'; 762 } 763 764 // use native registers, not the GDB registers 765 debugserver_args.AppendArgument("--native-regs"); 766 767 if (launch_info.GetLaunchInSeparateProcessGroup()) 768 { 769 debugserver_args.AppendArgument("--setsid"); 770 } 771 772 llvm::SmallString<PATH_MAX> named_pipe_path; 773 Pipe port_named_pipe; 774 775 bool listen = false; 776 if (host_and_port[0]) 777 { 778 // Create a temporary file to get the stdout/stderr and redirect the 779 // output of the command into this file. We will later read this file 780 // if all goes well and fill the data into "command_output_ptr" 781 782 if (in_port == 0) 783 { 784 // Binding to port zero, we need to figure out what port it ends up 785 // using using a named pipe... 786 error = port_named_pipe.CreateWithUniqueName("debugserver-named-pipe", false, named_pipe_path); 787 if (error.Fail()) 788 return error; 789 debugserver_args.AppendArgument("--named-pipe"); 790 debugserver_args.AppendArgument(named_pipe_path.c_str()); 791 } 792 else 793 { 794 listen = true; 795 } 796 } 797 else 798 { 799 // No host and port given, so lets listen on our end and make the debugserver 800 // connect to us.. 801 error = StartListenThread ("127.0.0.1", 0); 802 if (error.Fail()) 803 return error; 804 805 ConnectionFileDescriptor *connection = (ConnectionFileDescriptor *)GetConnection (); 806 // Wait for 10 seconds to resolve the bound port 807 out_port = connection->GetListeningPort(10); 808 if (out_port > 0) 809 { 810 char port_cstr[32]; 811 snprintf(port_cstr, sizeof(port_cstr), "127.0.0.1:%i", out_port); 812 // Send the host and port down that debugserver and specify an option 813 // so that it connects back to the port we are listening to in this process 814 debugserver_args.AppendArgument("--reverse-connect"); 815 debugserver_args.AppendArgument(port_cstr); 816 } 817 else 818 { 819 error.SetErrorString ("failed to bind to port 0 on 127.0.0.1"); 820 return error; 821 } 822 } 823 824 const char *env_debugserver_log_file = getenv("LLDB_DEBUGSERVER_LOG_FILE"); 825 if (env_debugserver_log_file) 826 { 827 ::snprintf (arg_cstr, sizeof(arg_cstr), "--log-file=%s", env_debugserver_log_file); 828 debugserver_args.AppendArgument(arg_cstr); 829 } 830 831 const char *env_debugserver_log_flags = getenv("LLDB_DEBUGSERVER_LOG_FLAGS"); 832 if (env_debugserver_log_flags) 833 { 834 ::snprintf (arg_cstr, sizeof(arg_cstr), "--log-flags=%s", env_debugserver_log_flags); 835 debugserver_args.AppendArgument(arg_cstr); 836 } 837 838 // Add additional args, starting with LLDB_DEBUGSERVER_EXTRA_ARG_1 until an env var doesn't come back. 839 uint32_t env_var_index = 1; 840 bool has_env_var; 841 do 842 { 843 char env_var_name[64]; 844 snprintf (env_var_name, sizeof (env_var_name), "LLDB_DEBUGSERVER_EXTRA_ARG_%" PRIu32, env_var_index++); 845 const char *extra_arg = getenv(env_var_name); 846 has_env_var = extra_arg != nullptr; 847 848 if (has_env_var) 849 { 850 debugserver_args.AppendArgument (extra_arg); 851 if (log) 852 log->Printf ("GDBRemoteCommunication::%s adding env var %s contents to stub command line (%s)", __FUNCTION__, env_var_name, extra_arg); 853 } 854 } while (has_env_var); 855 856 // Close STDIN, STDOUT and STDERR. 857 launch_info.AppendCloseFileAction (STDIN_FILENO); 858 launch_info.AppendCloseFileAction (STDOUT_FILENO); 859 launch_info.AppendCloseFileAction (STDERR_FILENO); 860 861 // Redirect STDIN, STDOUT and STDERR to "/dev/null". 862 launch_info.AppendSuppressFileAction (STDIN_FILENO, true, false); 863 launch_info.AppendSuppressFileAction (STDOUT_FILENO, false, true); 864 launch_info.AppendSuppressFileAction (STDERR_FILENO, false, true); 865 866 error = Host::LaunchProcess(launch_info); 867 868 if (error.Success() && launch_info.GetProcessID() != LLDB_INVALID_PROCESS_ID) 869 { 870 if (named_pipe_path.size() > 0) 871 { 872 error = port_named_pipe.OpenAsReader(named_pipe_path, false); 873 if (error.Success()) 874 { 875 char port_cstr[256]; 876 port_cstr[0] = '\0'; 877 size_t num_bytes = sizeof(port_cstr); 878 // Read port from pipe with 10 second timeout. 879 error = port_named_pipe.ReadWithTimeout(port_cstr, num_bytes, std::chrono::microseconds(10 * 1000000), num_bytes); 880 if (error.Success()) 881 { 882 assert (num_bytes > 0 && port_cstr[num_bytes-1] == '\0'); 883 out_port = StringConvert::ToUInt32(port_cstr, 0); 884 if (log) 885 log->Printf("GDBRemoteCommunication::%s() debugserver listens %u port", __FUNCTION__, out_port); 886 } 887 else 888 { 889 if (log) 890 log->Printf("GDBRemoteCommunication::%s() failed to read a port value from named pipe %s: %s", __FUNCTION__, named_pipe_path.c_str(), error.AsCString()); 891 892 } 893 port_named_pipe.Close(); 894 } 895 else 896 { 897 if (log) 898 log->Printf("GDBRemoteCommunication::%s() failed to open named pipe %s for reading: %s", __FUNCTION__, named_pipe_path.c_str(), error.AsCString()); 899 } 900 const auto err = port_named_pipe.Delete(named_pipe_path); 901 if (err.Fail()) 902 { 903 if (log) 904 log->Printf ("GDBRemoteCommunication::%s failed to delete pipe %s: %s", __FUNCTION__, named_pipe_path.c_str(), err.AsCString()); 905 } 906 } 907 else if (listen) 908 { 909 910 } 911 else 912 { 913 // Make sure we actually connect with the debugserver... 914 JoinListenThread(); 915 } 916 } 917 } 918 else 919 { 920 error.SetErrorStringWithFormat ("unable to locate " DEBUGSERVER_BASENAME ); 921 } 922 return error; 923 } 924 925 void 926 GDBRemoteCommunication::DumpHistory(Stream &strm) 927 { 928 m_history.Dump (strm); 929 } 930 931 GDBRemoteCommunication::ScopedTimeout::ScopedTimeout (GDBRemoteCommunication& gdb_comm, 932 uint32_t timeout) : 933 m_gdb_comm (gdb_comm) 934 { 935 m_saved_timeout = m_gdb_comm.SetPacketTimeout (timeout); 936 } 937 938 GDBRemoteCommunication::ScopedTimeout::~ScopedTimeout () 939 { 940 m_gdb_comm.SetPacketTimeout (m_saved_timeout); 941 } 942