1 //===-- lldb-gdbserver.cpp --------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
26 #include "LLDBServerUtilities.h"
27 #include "Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h"
28 #include "Plugins/Process/gdb-remote/ProcessGDBRemoteLog.h"
29 #include "lldb/Core/PluginManager.h"
30 #include "lldb/Host/ConnectionFileDescriptor.h"
31 #include "lldb/Host/HostGetOpt.h"
32 #include "lldb/Host/OptionParser.h"
33 #include "lldb/Host/Pipe.h"
34 #include "lldb/Host/Socket.h"
35 #include "lldb/Host/StringConvert.h"
36 #include "lldb/Host/common/NativeProcessProtocol.h"
37 #include "lldb/Utility/Status.h"
38 #include "llvm/ADT/StringRef.h"
39 #include "llvm/Support/Errno.h"
41 #if defined(__linux__)
42 #include "Plugins/Process/Linux/NativeProcessLinux.h"
43 #elif defined(__NetBSD__)
44 #include "Plugins/Process/NetBSD/NativeProcessNetBSD.h"
47 #ifndef LLGS_PROGRAM_NAME
48 #define LLGS_PROGRAM_NAME "lldb-server"
51 #ifndef LLGS_VERSION_STR
52 #define LLGS_VERSION_STR "local_build"
57 using namespace lldb_private;
58 using namespace lldb_private::lldb_server;
59 using namespace lldb_private::process_gdb_remote;
62 #if defined(__linux__)
63 typedef process_linux::NativeProcessLinux::Factory NativeProcessFactory;
64 #elif defined(__NetBSD__)
65 typedef process_netbsd::NativeProcessNetBSD::Factory NativeProcessFactory;
67 // Dummy implementation to make sure the code compiles
68 class NativeProcessFactory : public NativeProcessProtocol::Factory {
70 llvm::Expected<NativeProcessProtocolSP>
71 Launch(ProcessLaunchInfo &launch_info,
72 NativeProcessProtocol::NativeDelegate &delegate,
73 MainLoop &mainloop) const override {
74 llvm_unreachable("Not implemented");
76 llvm::Expected<NativeProcessProtocolSP>
77 Attach(lldb::pid_t pid, NativeProcessProtocol::NativeDelegate &delegate,
78 MainLoop &mainloop) const override {
79 llvm_unreachable("Not implemented");
85 //----------------------------------------------------------------------
86 // option descriptors for getopt_long_only()
87 //----------------------------------------------------------------------
89 static int g_debug = 0;
90 static int g_verbose = 0;
92 static struct option g_long_options[] = {
93 {"debug", no_argument, &g_debug, 1},
94 {"verbose", no_argument, &g_verbose, 1},
95 {"log-file", required_argument, NULL, 'l'},
96 {"log-channels", required_argument, NULL, 'c'},
97 {"attach", required_argument, NULL, 'a'},
98 {"named-pipe", required_argument, NULL, 'N'},
99 {"pipe", required_argument, NULL, 'U'},
100 {"native-regs", no_argument, NULL,
101 'r'}, // Specify to use the native registers instead of the gdb defaults
102 // for the architecture. NOTE: this is a do-nothing arg as it's
103 // behavior is default now. FIXME remove call from lldb-platform.
104 {"reverse-connect", no_argument, NULL,
105 'R'}, // Specifies that llgs attaches to the client address:port rather
106 // than llgs listening for a connection from address on port.
107 {"setsid", no_argument, NULL,
108 'S'}, // Call setsid() to make llgs run in its own session.
111 //----------------------------------------------------------------------
113 //----------------------------------------------------------------------
114 static int g_sighup_received_count = 0;
117 static void sighup_handler(MainLoopBase &mainloop) {
118 ++g_sighup_received_count;
120 Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PROCESS));
122 log->Printf("lldb-server:%s swallowing SIGHUP (receive count=%d)",
123 __FUNCTION__, g_sighup_received_count);
125 if (g_sighup_received_count >= 2)
126 mainloop.RequestTermination();
128 #endif // #ifndef _WIN32
130 static void display_usage(const char *progname, const char *subcommand) {
131 fprintf(stderr, "Usage:\n %s %s "
132 "[--log-file log-file-name] "
133 "[--log-channels log-channel-list] "
135 "[--named-pipe named-pipe-path] "
139 "[-- PROGRAM ARG1 ARG2 ...]\n",
140 progname, subcommand);
144 void handle_attach_to_pid(GDBRemoteCommunicationServerLLGS &gdb_server,
146 Status error = gdb_server.AttachToProcess(pid);
148 fprintf(stderr, "error: failed to attach to pid %" PRIu64 ": %s\n", pid,
154 void handle_attach_to_process_name(GDBRemoteCommunicationServerLLGS &gdb_server,
155 const std::string &process_name) {
159 void handle_attach(GDBRemoteCommunicationServerLLGS &gdb_server,
160 const std::string &attach_target) {
161 assert(!attach_target.empty() && "attach_target cannot be empty");
163 // First check if the attach_target is convertible to a long. If so, we'll use
165 char *end_p = nullptr;
166 const long int pid = strtol(attach_target.c_str(), &end_p, 10);
168 // We'll call it a match if the entire argument is consumed.
170 static_cast<size_t>(end_p - attach_target.c_str()) ==
171 attach_target.size())
172 handle_attach_to_pid(gdb_server, static_cast<lldb::pid_t>(pid));
174 handle_attach_to_process_name(gdb_server, attach_target);
177 void handle_launch(GDBRemoteCommunicationServerLLGS &gdb_server, int argc,
178 const char *const argv[]) {
180 error = gdb_server.SetLaunchArguments(argv, argc);
182 fprintf(stderr, "error: failed to set launch args for '%s': %s\n", argv[0],
187 unsigned int launch_flags = eLaunchFlagStopAtEntry | eLaunchFlagDebug;
189 error = gdb_server.SetLaunchFlags(launch_flags);
191 fprintf(stderr, "error: failed to set launch flags for '%s': %s\n", argv[0],
196 error = gdb_server.LaunchProcess();
198 fprintf(stderr, "error: failed to launch '%s': %s\n", argv[0],
204 Status writeSocketIdToPipe(Pipe &port_pipe, const std::string &socket_id) {
205 size_t bytes_written = 0;
206 // Write the port number as a C string with the NULL terminator.
207 return port_pipe.Write(socket_id.c_str(), socket_id.size() + 1,
211 Status writeSocketIdToPipe(const char *const named_pipe_path,
212 const std::string &socket_id) {
214 // Wait for 10 seconds for pipe to be opened.
215 auto error = port_name_pipe.OpenAsWriterWithTimeout(named_pipe_path, false,
216 std::chrono::seconds{10});
219 return writeSocketIdToPipe(port_name_pipe, socket_id);
222 Status writeSocketIdToPipe(int unnamed_pipe_fd, const std::string &socket_id) {
224 return Status("Unnamed pipes are not supported on Windows.");
226 Pipe port_pipe{Pipe::kInvalidDescriptor, unnamed_pipe_fd};
227 return writeSocketIdToPipe(port_pipe, socket_id);
231 void ConnectToRemote(MainLoop &mainloop,
232 GDBRemoteCommunicationServerLLGS &gdb_server,
233 bool reverse_connect, const char *const host_and_port,
234 const char *const progname, const char *const subcommand,
235 const char *const named_pipe_path, int unnamed_pipe_fd) {
238 if (host_and_port && host_and_port[0]) {
239 // Parse out host and port.
240 std::string final_host_and_port;
241 std::string connection_host;
242 std::string connection_port;
243 uint32_t connection_portno = 0;
245 // If host_and_port starts with ':', default the host to be "localhost" and
246 // expect the remainder to be the port.
247 if (host_and_port[0] == ':')
248 final_host_and_port.append("localhost");
249 final_host_and_port.append(host_and_port);
251 const std::string::size_type colon_pos = final_host_and_port.find(':');
252 if (colon_pos != std::string::npos) {
253 connection_host = final_host_and_port.substr(0, colon_pos);
254 connection_port = final_host_and_port.substr(colon_pos + 1);
255 connection_portno = StringConvert::ToUInt32(connection_port.c_str(), 0);
258 std::unique_ptr<Connection> connection_up;
260 if (reverse_connect) {
261 // llgs will connect to the gdb-remote client.
263 // Ensure we have a port number for the connection.
264 if (connection_portno == 0) {
265 fprintf(stderr, "error: port number must be specified on when using "
270 // Build the connection string.
271 char connection_url[512];
272 snprintf(connection_url, sizeof(connection_url), "connect://%s",
273 final_host_and_port.c_str());
275 // Create the connection.
276 connection_up.reset(new ConnectionFileDescriptor);
277 auto connection_result = connection_up->Connect(connection_url, &error);
278 if (connection_result != eConnectionStatusSuccess) {
279 fprintf(stderr, "error: failed to connect to client at '%s' "
280 "(connection status: %d)",
281 connection_url, static_cast<int>(connection_result));
285 fprintf(stderr, "error: failed to connect to client at '%s': %s",
286 connection_url, error.AsCString());
290 std::unique_ptr<Acceptor> acceptor_up(
291 Acceptor::Create(final_host_and_port, false, error));
293 fprintf(stderr, "failed to create acceptor: %s", error.AsCString());
296 error = acceptor_up->Listen(1);
298 fprintf(stderr, "failed to listen: %s\n", error.AsCString());
301 const std::string socket_id = acceptor_up->GetLocalSocketId();
302 if (!socket_id.empty()) {
303 // If we have a named pipe to write the socket id back to, do that now.
304 if (named_pipe_path && named_pipe_path[0]) {
305 error = writeSocketIdToPipe(named_pipe_path, socket_id);
307 fprintf(stderr, "failed to write to the named pipe \'%s\': %s",
308 named_pipe_path, error.AsCString());
310 // If we have an unnamed pipe to write the socket id back to, do that
312 else if (unnamed_pipe_fd >= 0) {
313 error = writeSocketIdToPipe(unnamed_pipe_fd, socket_id);
315 fprintf(stderr, "failed to write to the unnamed pipe: %s",
320 "unable to get the socket id for the listening connection\n");
323 Connection *conn = nullptr;
324 error = acceptor_up->Accept(false, conn);
326 printf("failed to accept new connection: %s\n", error.AsCString());
329 connection_up.reset(conn);
331 error = gdb_server.InitializeConnection(std::move(connection_up));
333 fprintf(stderr, "Failed to initialize connection: %s\n",
337 printf("Connection established.\n");
341 //----------------------------------------------------------------------
343 //----------------------------------------------------------------------
344 int main_gdbserver(int argc, char *argv[]) {
348 // Setup signal handlers first thing.
349 signal(SIGPIPE, SIG_IGN);
350 MainLoop::SignalHandleUP sighup_handle =
351 mainloop.RegisterSignal(SIGHUP, sighup_handler, error);
354 const char *progname = argv[0];
355 const char *subcommand = argv[1];
358 int long_option_index = 0;
360 std::string attach_target;
361 std::string named_pipe_path;
362 std::string log_file;
364 log_channels; // e.g. "lldb process threads:gdb-remote default:linux all"
365 int unnamed_pipe_fd = -1;
366 bool reverse_connect = false;
368 // ProcessLaunchInfo launch_info;
369 ProcessAttachInfo attach_info;
371 bool show_usage = false;
372 int option_error = 0;
380 std::string short_options(OptionParser::GetShortOptionString(g_long_options));
382 while ((ch = getopt_long_only(argc, argv, short_options.c_str(),
383 g_long_options, &long_option_index)) != -1) {
385 case 0: // Any optional that auto set themselves will return 0
388 case 'l': // Set Log File
389 if (optarg && optarg[0])
390 log_file.assign(optarg);
393 case 'c': // Log Channels
394 if (optarg && optarg[0])
395 log_channels = StringRef(optarg);
398 case 'N': // named pipe
399 if (optarg && optarg[0])
400 named_pipe_path = optarg;
403 case 'U': // unnamed pipe
404 if (optarg && optarg[0])
405 unnamed_pipe_fd = StringConvert::ToUInt32(optarg, -1);
409 // Do nothing, native regs is the default these days
413 reverse_connect = true;
418 // Put llgs into a new session. Terminals group processes
419 // into sessions and when a special terminal key sequences
420 // (like control+c) are typed they can cause signals to go out to
421 // all processes in a session. Using this --setsid (-S) option
422 // will cause debugserver to run in its own sessions and be free
425 // This is useful when llgs is spawned from a command
426 // line application that uses llgs to do the debugging,
427 // yet that application doesn't want llgs receiving the
428 // signals sent to the session (i.e. dying when anyone hits ^C).
430 const ::pid_t new_sid = setsid();
432 llvm::errs() << llvm::formatv(
433 "failed to set new session id for {0} ({1})\n", LLGS_PROGRAM_NAME,
434 llvm::sys::StrError());
440 case 'a': // attach {pid|process_name}
441 if (optarg && optarg[0])
442 attach_target = optarg;
445 case 'h': /* fall-through is intentional */
452 if (show_usage || option_error) {
453 display_usage(progname, subcommand);
457 if (!LLDBServerUtilities::SetupLogging(
458 log_file, log_channels,
459 LLDB_LOG_OPTION_PREPEND_TIMESTAMP |
460 LLDB_LOG_OPTION_PREPEND_FILE_FUNCTION))
463 Log *log(lldb_private::GetLogIfAnyCategoriesSet(GDBR_LOG_PROCESS));
465 log->Printf("lldb-server launch");
466 for (int i = 0; i < argc; i++) {
467 log->Printf("argv[%i] = '%s'", i, argv[i]);
471 // Skip any options we consumed with getopt_long_only.
476 display_usage(progname, subcommand);
480 NativeProcessFactory factory;
481 GDBRemoteCommunicationServerLLGS gdb_server(mainloop, factory);
483 const char *const host_and_port = argv[0];
487 // Any arguments left over are for the program that we need to launch. If
489 // are no arguments, then the GDB server will start up and wait for an 'A'
491 // to launch a program, or a vAttach packet to attach to an existing process,
493 // explicitly asked to attach with the --attach={pid|program_name} form.
494 if (!attach_target.empty())
495 handle_attach(gdb_server, attach_target);
497 handle_launch(gdb_server, argc, argv);
499 // Print version info.
500 printf("%s-%s", LLGS_PROGRAM_NAME, LLGS_VERSION_STR);
502 ConnectToRemote(mainloop, gdb_server, reverse_connect, host_and_port,
503 progname, subcommand, named_pipe_path.c_str(),
506 if (!gdb_server.IsConnected()) {
507 fprintf(stderr, "no connection information provided, unable to run\n");
508 display_usage(progname, subcommand);
513 fprintf(stderr, "lldb-server exiting...\n");