386 lines
12 KiB
C++
386 lines
12 KiB
C++
//===-- lldb-platform.cpp ---------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// C Includes
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#include <errno.h>
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#if defined(__APPLE__)
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#include <netinet/in.h>
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#endif
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#include <signal.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/wait.h>
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// C++ Includes
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#include <fstream>
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// Other libraries and framework includes
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/FileUtilities.h"
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#include "Acceptor.h"
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#include "LLDBServerUtilities.h"
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#include "Plugins/Process/gdb-remote/GDBRemoteCommunicationServerPlatform.h"
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#include "Plugins/Process/gdb-remote/ProcessGDBRemoteLog.h"
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#include "lldb/Core/Error.h"
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#include "lldb/Host/ConnectionFileDescriptor.h"
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#include "lldb/Host/FileSpec.h"
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#include "lldb/Host/FileSystem.h"
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#include "lldb/Host/HostGetOpt.h"
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#include "lldb/Host/OptionParser.h"
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#include "lldb/Host/common/TCPSocket.h"
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private::lldb_server;
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using namespace lldb_private::process_gdb_remote;
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using namespace llvm;
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//----------------------------------------------------------------------
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// option descriptors for getopt_long_only()
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//----------------------------------------------------------------------
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static int g_debug = 0;
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static int g_verbose = 0;
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static int g_server = 0;
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static struct option g_long_options[] = {
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{"debug", no_argument, &g_debug, 1},
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{"verbose", no_argument, &g_verbose, 1},
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{"log-file", required_argument, NULL, 'l'},
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{"log-channels", required_argument, NULL, 'c'},
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{"listen", required_argument, NULL, 'L'},
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{"port-offset", required_argument, NULL, 'p'},
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{"gdbserver-port", required_argument, NULL, 'P'},
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{"min-gdbserver-port", required_argument, NULL, 'm'},
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{"max-gdbserver-port", required_argument, NULL, 'M'},
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{"socket-file", required_argument, NULL, 'f'},
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{"server", no_argument, &g_server, 1},
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{NULL, 0, NULL, 0}};
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#if defined(__APPLE__)
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#define LOW_PORT (IPPORT_RESERVED)
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#define HIGH_PORT (IPPORT_HIFIRSTAUTO)
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#else
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#define LOW_PORT (1024u)
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#define HIGH_PORT (49151u)
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#endif
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//----------------------------------------------------------------------
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// Watch for signals
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//----------------------------------------------------------------------
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static void signal_handler(int signo) {
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switch (signo) {
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case SIGHUP:
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// Use SIGINT first, if that does not work, use SIGHUP as a last resort.
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// And we should not call exit() here because it results in the global
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// destructors
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// to be invoked and wreaking havoc on the threads still running.
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Host::SystemLog(Host::eSystemLogWarning,
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"SIGHUP received, exiting lldb-server...\n");
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abort();
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break;
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}
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}
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static void display_usage(const char *progname, const char *subcommand) {
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fprintf(stderr, "Usage:\n %s %s [--log-file log-file-name] [--log-channels "
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"log-channel-list] [--port-file port-file-path] --server "
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"--listen port\n",
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progname, subcommand);
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exit(0);
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}
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static Error save_socket_id_to_file(const std::string &socket_id,
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const FileSpec &file_spec) {
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FileSpec temp_file_spec(file_spec.GetDirectory().AsCString(), false);
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auto error = FileSystem::MakeDirectory(temp_file_spec,
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eFilePermissionsDirectoryDefault);
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if (error.Fail())
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return Error("Failed to create directory %s: %s",
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temp_file_spec.GetCString(), error.AsCString());
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llvm::SmallString<PATH_MAX> temp_file_path;
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temp_file_spec.AppendPathComponent("port-file.%%%%%%");
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auto err_code = llvm::sys::fs::createUniqueFile(temp_file_spec.GetCString(),
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temp_file_path);
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if (err_code)
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return Error("Failed to create temp file: %s", err_code.message().c_str());
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llvm::FileRemover tmp_file_remover(temp_file_path.c_str());
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{
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std::ofstream temp_file(temp_file_path.c_str(), std::ios::out);
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if (!temp_file.is_open())
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return Error("Failed to open temp file %s", temp_file_path.c_str());
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temp_file << socket_id;
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}
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err_code = llvm::sys::fs::rename(temp_file_path.c_str(), file_spec.GetPath());
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if (err_code)
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return Error("Failed to rename file %s to %s: %s", temp_file_path.c_str(),
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file_spec.GetPath().c_str(), err_code.message().c_str());
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tmp_file_remover.releaseFile();
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return Error();
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}
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//----------------------------------------------------------------------
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// main
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//----------------------------------------------------------------------
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int main_platform(int argc, char *argv[]) {
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const char *progname = argv[0];
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const char *subcommand = argv[1];
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argc--;
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argv++;
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signal(SIGPIPE, SIG_IGN);
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signal(SIGHUP, signal_handler);
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int long_option_index = 0;
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Error error;
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std::string listen_host_port;
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int ch;
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std::string log_file;
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StringRef
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log_channels; // e.g. "lldb process threads:gdb-remote default:linux all"
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GDBRemoteCommunicationServerPlatform::PortMap gdbserver_portmap;
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int min_gdbserver_port = 0;
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int max_gdbserver_port = 0;
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uint16_t port_offset = 0;
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FileSpec socket_file;
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bool show_usage = false;
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int option_error = 0;
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int socket_error = -1;
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std::string short_options(OptionParser::GetShortOptionString(g_long_options));
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#if __GLIBC__
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optind = 0;
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#else
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optreset = 1;
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optind = 1;
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#endif
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while ((ch = getopt_long_only(argc, argv, short_options.c_str(),
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g_long_options, &long_option_index)) != -1) {
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switch (ch) {
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case 0: // Any optional that auto set themselves will return 0
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break;
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case 'L':
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listen_host_port.append(optarg);
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break;
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case 'l': // Set Log File
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if (optarg && optarg[0])
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log_file.assign(optarg);
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break;
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case 'c': // Log Channels
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if (optarg && optarg[0])
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log_channels = StringRef(optarg);
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break;
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case 'f': // Socket file
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if (optarg && optarg[0])
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socket_file.SetFile(optarg, false);
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break;
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case 'p': {
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char *end = NULL;
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long tmp_port_offset = strtoul(optarg, &end, 0);
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if (end && *end == '\0') {
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if (LOW_PORT <= tmp_port_offset && tmp_port_offset <= HIGH_PORT) {
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port_offset = (uint16_t)tmp_port_offset;
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} else {
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fprintf(stderr, "error: port offset %li is not in the valid user "
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"port range of %u - %u\n",
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tmp_port_offset, LOW_PORT, HIGH_PORT);
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option_error = 5;
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}
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} else {
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fprintf(stderr, "error: invalid port offset string %s\n", optarg);
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option_error = 4;
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}
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} break;
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case 'P':
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case 'm':
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case 'M': {
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char *end = NULL;
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long portnum = strtoul(optarg, &end, 0);
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if (end && *end == '\0') {
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if (LOW_PORT <= portnum && portnum <= HIGH_PORT) {
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if (ch == 'P')
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gdbserver_portmap[(uint16_t)portnum] = LLDB_INVALID_PROCESS_ID;
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else if (ch == 'm')
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min_gdbserver_port = portnum;
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else
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max_gdbserver_port = portnum;
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} else {
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fprintf(stderr, "error: port number %li is not in the valid user "
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"port range of %u - %u\n",
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portnum, LOW_PORT, HIGH_PORT);
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option_error = 1;
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}
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} else {
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fprintf(stderr, "error: invalid port number string %s\n", optarg);
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option_error = 2;
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}
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} break;
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case 'h': /* fall-through is intentional */
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case '?':
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show_usage = true;
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break;
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}
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}
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if (!LLDBServerUtilities::SetupLogging(log_file, log_channels, 0))
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return -1;
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// Make a port map for a port range that was specified.
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if (min_gdbserver_port < max_gdbserver_port) {
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for (uint16_t port = min_gdbserver_port; port < max_gdbserver_port; ++port)
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gdbserver_portmap[port] = LLDB_INVALID_PROCESS_ID;
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} else if (min_gdbserver_port != max_gdbserver_port) {
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fprintf(stderr, "error: --min-gdbserver-port (%u) is greater than "
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"--max-gdbserver-port (%u)\n",
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min_gdbserver_port, max_gdbserver_port);
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option_error = 3;
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}
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// Print usage and exit if no listening port is specified.
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if (listen_host_port.empty())
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show_usage = true;
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if (show_usage || option_error) {
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display_usage(progname, subcommand);
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exit(option_error);
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}
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// Skip any options we consumed with getopt_long_only.
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argc -= optind;
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argv += optind;
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lldb_private::Args inferior_arguments;
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inferior_arguments.SetArguments(argc, const_cast<const char **>(argv));
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const bool children_inherit_listen_socket = false;
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// the test suite makes many connections in parallel, let's not miss any.
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// The highest this should get reasonably is a function of the number
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// of target CPUs. For now, let's just use 100.
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const int backlog = 100;
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std::unique_ptr<Acceptor> acceptor_up(Acceptor::Create(
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listen_host_port, children_inherit_listen_socket, error));
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if (error.Fail()) {
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fprintf(stderr, "failed to create acceptor: %s", error.AsCString());
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exit(socket_error);
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}
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error = acceptor_up->Listen(backlog);
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if (error.Fail()) {
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printf("failed to listen: %s\n", error.AsCString());
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exit(socket_error);
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}
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if (socket_file) {
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error =
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save_socket_id_to_file(acceptor_up->GetLocalSocketId(), socket_file);
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if (error.Fail()) {
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fprintf(stderr, "failed to write socket id to %s: %s\n",
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socket_file.GetPath().c_str(), error.AsCString());
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return 1;
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}
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}
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do {
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GDBRemoteCommunicationServerPlatform platform(
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acceptor_up->GetSocketProtocol(), acceptor_up->GetSocketScheme());
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if (port_offset > 0)
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platform.SetPortOffset(port_offset);
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if (!gdbserver_portmap.empty()) {
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platform.SetPortMap(std::move(gdbserver_portmap));
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}
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const bool children_inherit_accept_socket = true;
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Connection *conn = nullptr;
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error = acceptor_up->Accept(children_inherit_accept_socket, conn);
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if (error.Fail()) {
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printf("error: %s\n", error.AsCString());
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exit(socket_error);
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}
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printf("Connection established.\n");
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if (g_server) {
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// Collect child zombie processes.
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while (waitpid(-1, nullptr, WNOHANG) > 0)
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;
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if (fork()) {
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// Parent doesn't need a connection to the lldb client
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delete conn;
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// Parent will continue to listen for new connections.
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continue;
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} else {
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// Child process will handle the connection and exit.
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g_server = 0;
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// Listening socket is owned by parent process.
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acceptor_up.release();
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}
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} else {
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// If not running as a server, this process will not accept
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// connections while a connection is active.
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acceptor_up.reset();
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}
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platform.SetConnection(conn);
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if (platform.IsConnected()) {
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if (inferior_arguments.GetArgumentCount() > 0) {
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lldb::pid_t pid = LLDB_INVALID_PROCESS_ID;
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uint16_t port = 0;
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std::string socket_name;
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Error error = platform.LaunchGDBServer(inferior_arguments,
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"", // hostname
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pid, port, socket_name);
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if (error.Success())
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platform.SetPendingGdbServer(pid, port, socket_name);
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else
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fprintf(stderr, "failed to start gdbserver: %s\n", error.AsCString());
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}
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// After we connected, we need to get an initial ack from...
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if (platform.HandshakeWithClient()) {
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bool interrupt = false;
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bool done = false;
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while (!interrupt && !done) {
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if (platform.GetPacketAndSendResponse(llvm::None, error, interrupt,
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done) !=
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GDBRemoteCommunication::PacketResult::Success)
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break;
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}
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if (error.Fail()) {
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fprintf(stderr, "error: %s\n", error.AsCString());
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}
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} else {
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fprintf(stderr, "error: handshake with client failed\n");
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}
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}
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} while (g_server);
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fprintf(stderr, "lldb-server exiting...\n");
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return 0;
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}
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