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Diffstat (limited to 'lib/cli/consolecommand.cpp')
| -rw-r--r-- | lib/cli/consolecommand.cpp | 723 |
1 files changed, 723 insertions, 0 deletions
diff --git a/lib/cli/consolecommand.cpp b/lib/cli/consolecommand.cpp new file mode 100644 index 0000000..b54966e --- /dev/null +++ b/lib/cli/consolecommand.cpp @@ -0,0 +1,723 @@ +/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */ + +#include "cli/consolecommand.hpp" +#include "config/configcompiler.hpp" +#include "remote/consolehandler.hpp" +#include "remote/url.hpp" +#include "base/configwriter.hpp" +#include "base/serializer.hpp" +#include "base/json.hpp" +#include "base/console.hpp" +#include "base/application.hpp" +#include "base/objectlock.hpp" +#include "base/unixsocket.hpp" +#include "base/utility.hpp" +#include "base/networkstream.hpp" +#include "base/defer.hpp" +#include "base/io-engine.hpp" +#include "base/stream.hpp" +#include "base/tcpsocket.hpp" /* include global icinga::Connect */ +#include <base/base64.hpp> +#include "base/exception.hpp" +#include <boost/asio/ssl/context.hpp> +#include <boost/beast/core/flat_buffer.hpp> +#include <boost/beast/http/field.hpp> +#include <boost/beast/http/message.hpp> +#include <boost/beast/http/parser.hpp> +#include <boost/beast/http/read.hpp> +#include <boost/beast/http/status.hpp> +#include <boost/beast/http/string_body.hpp> +#include <boost/beast/http/verb.hpp> +#include <boost/beast/http/write.hpp> +#include <iostream> +#include <fstream> + + +#ifdef HAVE_EDITLINE +#include "cli/editline.hpp" +#endif /* HAVE_EDITLINE */ + +using namespace icinga; +namespace po = boost::program_options; + +static ScriptFrame *l_ScriptFrame; +static Url::Ptr l_Url; +static Shared<AsioTlsStream>::Ptr l_TlsStream; +static String l_Session; + +REGISTER_CLICOMMAND("console", ConsoleCommand); + +INITIALIZE_ONCE(&ConsoleCommand::StaticInitialize); + +extern "C" void dbg_spawn_console() +{ + ScriptFrame frame(true); + ConsoleCommand::RunScriptConsole(frame); +} + +extern "C" void dbg_inspect_value(const Value& value) +{ + ConfigWriter::EmitValue(std::cout, 1, Serialize(value, 0)); + std::cout << std::endl; +} + +extern "C" void dbg_inspect_object(Object *obj) +{ + Object::Ptr objr = obj; + dbg_inspect_value(objr); +} + +extern "C" void dbg_eval(const char *text) +{ + std::unique_ptr<Expression> expr; + + try { + ScriptFrame frame(true); + expr = ConfigCompiler::CompileText("<dbg>", text); + Value result = Serialize(expr->Evaluate(frame), 0); + dbg_inspect_value(result); + } catch (const std::exception& ex) { + std::cout << "Error: " << DiagnosticInformation(ex) << "\n"; + } +} + +extern "C" void dbg_eval_with_value(const Value& value, const char *text) +{ + std::unique_ptr<Expression> expr; + + try { + ScriptFrame frame(true); + frame.Locals = new Dictionary({ + { "arg", value } + }); + expr = ConfigCompiler::CompileText("<dbg>", text); + Value result = Serialize(expr->Evaluate(frame), 0); + dbg_inspect_value(result); + } catch (const std::exception& ex) { + std::cout << "Error: " << DiagnosticInformation(ex) << "\n"; + } +} + +extern "C" void dbg_eval_with_object(Object *object, const char *text) +{ + std::unique_ptr<Expression> expr; + + try { + ScriptFrame frame(true); + frame.Locals = new Dictionary({ + { "arg", object } + }); + expr = ConfigCompiler::CompileText("<dbg>", text); + Value result = Serialize(expr->Evaluate(frame), 0); + dbg_inspect_value(result); + } catch (const std::exception& ex) { + std::cout << "Error: " << DiagnosticInformation(ex) << "\n"; + } +} + +void ConsoleCommand::BreakpointHandler(ScriptFrame& frame, ScriptError *ex, const DebugInfo& di) +{ + static std::mutex mutex; + std::unique_lock<std::mutex> lock(mutex); + + if (!Application::GetScriptDebuggerEnabled()) + return; + + if (ex && ex->IsHandledByDebugger()) + return; + + std::cout << "Breakpoint encountered.\n"; + + if (ex) { + std::cout << "Exception: " << DiagnosticInformation(*ex) << "\n"; + ex->SetHandledByDebugger(true); + } else + ShowCodeLocation(std::cout, di); + + std::cout << "You can inspect expressions (such as variables) by entering them at the prompt.\n" + << "To leave the debugger and continue the program use \"$continue\".\n" + << "For further commands see \"$help\".\n"; + +#ifdef HAVE_EDITLINE + rl_completion_entry_function = ConsoleCommand::ConsoleCompleteHelper; + rl_completion_append_character = '\0'; +#endif /* HAVE_EDITLINE */ + + ConsoleCommand::RunScriptConsole(frame); +} + +void ConsoleCommand::StaticInitialize() +{ + Expression::OnBreakpoint.connect(&ConsoleCommand::BreakpointHandler); +} + +String ConsoleCommand::GetDescription() const +{ + return "Interprets Icinga script expressions."; +} + +String ConsoleCommand::GetShortDescription() const +{ + return "Icinga console"; +} + +ImpersonationLevel ConsoleCommand::GetImpersonationLevel() const +{ + return ImpersonateNone; +} + +void ConsoleCommand::InitParameters(boost::program_options::options_description& visibleDesc, + boost::program_options::options_description& hiddenDesc) const +{ + visibleDesc.add_options() + ("connect,c", po::value<std::string>(), "connect to an Icinga 2 instance") + ("eval,e", po::value<std::string>(), "evaluate expression and terminate") + ("file,r", po::value<std::string>(), "evaluate a file and terminate") + ("syntax-only", "only validate syntax (requires --eval or --file)") + ("sandbox", "enable sandbox mode") + ; +} + +#ifdef HAVE_EDITLINE +char *ConsoleCommand::ConsoleCompleteHelper(const char *word, int state) +{ + static std::vector<String> matches; + + if (state == 0) { + if (!l_Url) + matches = ConsoleHandler::GetAutocompletionSuggestions(word, *l_ScriptFrame); + else { + Array::Ptr suggestions; + + /* Remote debug console. */ + try { + suggestions = AutoCompleteScript(l_Session, word, l_ScriptFrame->Sandboxed); + } catch (...) { + return nullptr; //Errors are just ignored here. + } + + matches.clear(); + + ObjectLock olock(suggestions); + std::copy(suggestions->Begin(), suggestions->End(), std::back_inserter(matches)); + } + } + + if (state >= static_cast<int>(matches.size())) + return nullptr; + + return strdup(matches[state].CStr()); +} +#endif /* HAVE_EDITLINE */ + +/** + * The entry point for the "console" CLI command. + * + * @returns An exit status. + */ +int ConsoleCommand::Run(const po::variables_map& vm, const std::vector<std::string>& ap) const +{ +#ifdef HAVE_EDITLINE + rl_completion_entry_function = ConsoleCommand::ConsoleCompleteHelper; + rl_completion_append_character = '\0'; +#endif /* HAVE_EDITLINE */ + + String addr, session; + ScriptFrame scriptFrame(true); + + session = Utility::NewUniqueID(); + + if (vm.count("sandbox")) + scriptFrame.Sandboxed = true; + + scriptFrame.Self = scriptFrame.Locals; + + if (!vm.count("eval") && !vm.count("file")) + std::cout << "Icinga 2 (version: " << Application::GetAppVersion() << ")\n" + << "Type $help to view available commands.\n"; + + String addrEnv = Utility::GetFromEnvironment("ICINGA2_API_URL"); + if (!addrEnv.IsEmpty()) + addr = addrEnv; + + /* Initialize remote connect parameters. */ + if (vm.count("connect")) { + addr = vm["connect"].as<std::string>(); + + try { + l_Url = new Url(addr); + } catch (const std::exception& ex) { + Log(LogCritical, "ConsoleCommand", ex.what()); + return EXIT_FAILURE; + } + + String usernameEnv = Utility::GetFromEnvironment("ICINGA2_API_USERNAME"); + String passwordEnv = Utility::GetFromEnvironment("ICINGA2_API_PASSWORD"); + + if (!usernameEnv.IsEmpty()) + l_Url->SetUsername(usernameEnv); + if (!passwordEnv.IsEmpty()) + l_Url->SetPassword(passwordEnv); + + if (l_Url->GetPort().IsEmpty()) + l_Url->SetPort("5665"); + + /* User passed --connect and wants to run the expression via REST API. + * Evaluate this now before any user input happens. + */ + try { + l_TlsStream = ConsoleCommand::Connect(); + } catch (const std::exception& ex) { + return EXIT_FAILURE; + } + } + + String command; + bool syntaxOnly = false; + + if (vm.count("syntax-only")) { + if (vm.count("eval") || vm.count("file")) + syntaxOnly = true; + else { + std::cerr << "The option --syntax-only can only be used in combination with --eval or --file." << std::endl; + return EXIT_FAILURE; + } + } + + String commandFileName; + + if (vm.count("eval")) + command = vm["eval"].as<std::string>(); + else if (vm.count("file")) { + commandFileName = vm["file"].as<std::string>(); + + try { + std::ifstream fp(commandFileName.CStr()); + fp.exceptions(std::ifstream::failbit | std::ifstream::badbit); + command = String(std::istreambuf_iterator<char>(fp), std::istreambuf_iterator<char>()); + } catch (const std::exception&) { + std::cerr << "Could not read file '" << commandFileName << "'." << std::endl; + return EXIT_FAILURE; + } + } + + return RunScriptConsole(scriptFrame, addr, session, command, commandFileName, syntaxOnly); +} + +int ConsoleCommand::RunScriptConsole(ScriptFrame& scriptFrame, const String& connectAddr, const String& session, + const String& commandOnce, const String& commandOnceFileName, bool syntaxOnly) +{ + std::map<String, String> lines; + int next_line = 1; + +#ifdef HAVE_EDITLINE + String homeEnv = Utility::GetFromEnvironment("HOME"); + + String historyPath; + std::fstream historyfp; + + if (!homeEnv.IsEmpty()) { + historyPath = String(homeEnv) + "/.icinga2_history"; + + historyfp.open(historyPath.CStr(), std::fstream::in); + + String line; + while (std::getline(historyfp, line.GetData())) + add_history(line.CStr()); + + historyfp.close(); + } +#endif /* HAVE_EDITLINE */ + + l_ScriptFrame = &scriptFrame; + l_Session = session; + + while (std::cin.good()) { + String fileName; + + if (commandOnceFileName.IsEmpty()) + fileName = "<" + Convert::ToString(next_line) + ">"; + else + fileName = commandOnceFileName; + + next_line++; + + bool continuation = false; + std::string command; + +incomplete: + std::string line; + + if (commandOnce.IsEmpty()) { +#ifdef HAVE_EDITLINE + std::ostringstream promptbuf; + std::ostream& os = promptbuf; +#else /* HAVE_EDITLINE */ + std::ostream& os = std::cout; +#endif /* HAVE_EDITLINE */ + + os << fileName; + + if (!continuation) + os << " => "; + else + os << " .. "; + +#ifdef HAVE_EDITLINE + String prompt = promptbuf.str(); + + char *cline; + cline = readline(prompt.CStr()); + + if (!cline) + break; + + if (commandOnce.IsEmpty() && cline[0] != '\0') { + add_history(cline); + + if (!historyPath.IsEmpty()) { + historyfp.open(historyPath.CStr(), std::fstream::out | std::fstream::app); + historyfp << cline << "\n"; + historyfp.close(); + } + } + + line = cline; + + free(cline); +#else /* HAVE_EDITLINE */ + std::getline(std::cin, line); +#endif /* HAVE_EDITLINE */ + } else + line = commandOnce; + + if (!line.empty() && line[0] == '$') { + if (line == "$continue" || line == "$quit" || line == "$exit") + break; + else if (line == "$help") + std::cout << "Welcome to the Icinga 2 debug console.\n" + "Usable commands:\n" + " $continue Continue running Icinga 2 (script debugger).\n" + " $quit, $exit Stop debugging and quit the console.\n" + " $help Print this help.\n\n" + "For more information on how to use this console, please consult the documentation at https://icinga.com/docs\n"; + else + std::cout << "Unknown debugger command: " << line << "\n"; + + continue; + } + + if (!command.empty()) + command += "\n"; + + command += line; + + std::unique_ptr<Expression> expr; + + try { + lines[fileName] = command; + + Value result; + + /* Local debug console. */ + if (connectAddr.IsEmpty()) { + expr = ConfigCompiler::CompileText(fileName, command); + + /* This relies on the fact that - for syntax errors - CompileText() + * returns an AST where the top-level expression is a 'throw'. */ + if (!syntaxOnly || dynamic_cast<ThrowExpression *>(expr.get())) { + if (syntaxOnly) + std::cerr << " => " << command << std::endl; + result = Serialize(expr->Evaluate(scriptFrame), 0); + } else + result = true; + } else { + /* Remote debug console. */ + try { + result = ExecuteScript(l_Session, command, scriptFrame.Sandboxed); + } catch (const ScriptError&) { + /* Re-throw the exception for the outside try-catch block. */ + boost::rethrow_exception(boost::current_exception()); + } catch (const std::exception& ex) { + Log(LogCritical, "ConsoleCommand") + << "HTTP query failed: " << ex.what(); + +#ifdef HAVE_EDITLINE + /* Ensures that the terminal state is reset */ + rl_deprep_terminal(); +#endif /* HAVE_EDITLINE */ + + return EXIT_FAILURE; + } + } + + if (commandOnce.IsEmpty()) { + std::cout << ConsoleColorTag(Console_ForegroundCyan); + ConfigWriter::EmitValue(std::cout, 1, result); + std::cout << ConsoleColorTag(Console_Normal) << "\n"; + } else { + std::cout << JsonEncode(result) << "\n"; + break; + } + } catch (const ScriptError& ex) { + if (ex.IsIncompleteExpression() && commandOnce.IsEmpty()) { + continuation = true; + goto incomplete; + } + + DebugInfo di = ex.GetDebugInfo(); + + if (commandOnceFileName.IsEmpty() && lines.find(di.Path) != lines.end()) { + String text = lines[di.Path]; + + std::vector<String> ulines = text.Split("\n"); + + for (decltype(ulines.size()) i = 1; i <= ulines.size(); i++) { + int start, len; + + if (i == (decltype(i))di.FirstLine) + start = di.FirstColumn; + else + start = 0; + + if (i == (decltype(i))di.LastLine) + len = di.LastColumn - di.FirstColumn + 1; + else + len = ulines[i - 1].GetLength(); + + int offset; + + if (di.Path != fileName) { + std::cout << di.Path << ": " << ulines[i - 1] << "\n"; + offset = 2; + } else + offset = 4; + + if (i >= (decltype(i))di.FirstLine && i <= (decltype(i))di.LastLine) { + std::cout << String(di.Path.GetLength() + offset, ' '); + std::cout << String(start, ' ') << String(len, '^') << "\n"; + } + } + } else { + ShowCodeLocation(std::cout, di); + } + + std::cout << ex.what() << "\n"; + + if (!commandOnce.IsEmpty()) + return EXIT_FAILURE; + } catch (const std::exception& ex) { + std::cout << "Error: " << DiagnosticInformation(ex) << "\n"; + + if (!commandOnce.IsEmpty()) + return EXIT_FAILURE; + } + } + + return EXIT_SUCCESS; +} + +/** + * Connects to host:port and performs a TLS shandshake + * + * @returns AsioTlsStream pointer for future HTTP connections. + */ +Shared<AsioTlsStream>::Ptr ConsoleCommand::Connect() +{ + Shared<boost::asio::ssl::context>::Ptr sslContext; + + try { + sslContext = MakeAsioSslContext(Empty, Empty, Empty); //TODO: Add support for cert, key, ca parameters + } catch(const std::exception& ex) { + Log(LogCritical, "DebugConsole") + << "Cannot make SSL context: " << ex.what(); + throw; + } + + String host = l_Url->GetHost(); + String port = l_Url->GetPort(); + + Shared<AsioTlsStream>::Ptr stream = Shared<AsioTlsStream>::Make(IoEngine::Get().GetIoContext(), *sslContext, host); + + try { + icinga::Connect(stream->lowest_layer(), host, port); + } catch (const std::exception& ex) { + Log(LogWarning, "DebugConsole") + << "Cannot connect to REST API on host '" << host << "' port '" << port << "': " << ex.what(); + throw; + } + + auto& tlsStream (stream->next_layer()); + + try { + tlsStream.handshake(tlsStream.client); + } catch (const std::exception& ex) { + Log(LogWarning, "DebugConsole") + << "TLS handshake with host '" << host << "' failed: " << ex.what(); + throw; + } + + return std::move(stream); +} + +/** + * Sends the request via REST API and returns the parsed response. + * + * @param tlsStream Caller must prepare TLS stream/handshake. + * @param url Fully prepared Url object. + * @return A dictionary decoded from JSON. + */ +Dictionary::Ptr ConsoleCommand::SendRequest() +{ + namespace beast = boost::beast; + namespace http = beast::http; + + l_TlsStream = ConsoleCommand::Connect(); + + Defer s ([&]() { + l_TlsStream->next_layer().shutdown(); + }); + + http::request<http::string_body> request(http::verb::post, std::string(l_Url->Format(false)), 10); + + request.set(http::field::user_agent, "Icinga/DebugConsole/" + Application::GetAppVersion()); + request.set(http::field::host, l_Url->GetHost() + ":" + l_Url->GetPort()); + + request.set(http::field::accept, "application/json"); + request.set(http::field::authorization, "Basic " + Base64::Encode(l_Url->GetUsername() + ":" + l_Url->GetPassword())); + + try { + http::write(*l_TlsStream, request); + l_TlsStream->flush(); + } catch (const std::exception &ex) { + Log(LogWarning, "DebugConsole") + << "Cannot write HTTP request to REST API at URL '" << l_Url->Format(true) << "': " << ex.what(); + throw; + } + + http::parser<false, http::string_body> parser; + beast::flat_buffer buf; + + try { + http::read(*l_TlsStream, buf, parser); + } catch (const std::exception &ex) { + Log(LogWarning, "DebugConsole") + << "Failed to parse HTTP response from REST API at URL '" << l_Url->Format(true) << "': " << ex.what(); + throw; + } + + auto &response(parser.get()); + + /* Handle HTTP errors first. */ + if (response.result() != http::status::ok) { + String message = "HTTP request failed; Code: " + Convert::ToString(response.result()) + + "; Body: " + response.body(); + BOOST_THROW_EXCEPTION(ScriptError(message)); + } + + Dictionary::Ptr jsonResponse; + auto &body(response.body()); + + //Log(LogWarning, "Console") + // << "Got response: " << response.body(); + + try { + jsonResponse = JsonDecode(body); + } catch (...) { + String message = "Cannot parse JSON response body: " + response.body(); + BOOST_THROW_EXCEPTION(ScriptError(message)); + } + + return jsonResponse; +} + +/** + * Executes the DSL script via HTTP and returns HTTP and user errors. + * + * @param session Local session handler. + * @param command The DSL string. + * @param sandboxed Whether to run this sandboxed. + * @return Result value, also contains user errors. + */ +Value ConsoleCommand::ExecuteScript(const String& session, const String& command, bool sandboxed) +{ + /* Extend the url parameters for the request. */ + l_Url->SetPath({"v1", "console", "execute-script"}); + + l_Url->SetQuery({ + {"session", session}, + {"command", command}, + {"sandboxed", sandboxed ? "1" : "0"} + }); + + Dictionary::Ptr jsonResponse = SendRequest(); + + /* Extract the result, and handle user input errors too. */ + Array::Ptr results = jsonResponse->Get("results"); + Value result; + + if (results && results->GetLength() > 0) { + Dictionary::Ptr resultInfo = results->Get(0); + + if (resultInfo->Get("code") >= 200 && resultInfo->Get("code") <= 299) { + result = resultInfo->Get("result"); + } else { + String errorMessage = resultInfo->Get("status"); + + DebugInfo di; + Dictionary::Ptr debugInfo = resultInfo->Get("debug_info"); + + if (debugInfo) { + di.Path = debugInfo->Get("path"); + di.FirstLine = debugInfo->Get("first_line"); + di.FirstColumn = debugInfo->Get("first_column"); + di.LastLine = debugInfo->Get("last_line"); + di.LastColumn = debugInfo->Get("last_column"); + } + + bool incompleteExpression = resultInfo->Get("incomplete_expression"); + BOOST_THROW_EXCEPTION(ScriptError(errorMessage, di, incompleteExpression)); + } + } + + return result; +} + +/** + * Executes the auto completion script via HTTP and returns HTTP and user errors. + * + * @param session Local session handler. + * @param command The auto completion string. + * @param sandboxed Whether to run this sandboxed. + * @return Result value, also contains user errors. + */ +Array::Ptr ConsoleCommand::AutoCompleteScript(const String& session, const String& command, bool sandboxed) +{ + /* Extend the url parameters for the request. */ + l_Url->SetPath({ "v1", "console", "auto-complete-script" }); + + l_Url->SetQuery({ + {"session", session}, + {"command", command}, + {"sandboxed", sandboxed ? "1" : "0"} + }); + + Dictionary::Ptr jsonResponse = SendRequest(); + + /* Extract the result, and handle user input errors too. */ + Array::Ptr results = jsonResponse->Get("results"); + Array::Ptr suggestions; + + if (results && results->GetLength() > 0) { + Dictionary::Ptr resultInfo = results->Get(0); + + if (resultInfo->Get("code") >= 200 && resultInfo->Get("code") <= 299) { + suggestions = resultInfo->Get("suggestions"); + } else { + String errorMessage = resultInfo->Get("status"); + BOOST_THROW_EXCEPTION(ScriptError(errorMessage)); + } + } + + return suggestions; +} |