mirror of
https://github.com/zeek/zeek.git
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656 lines
20 KiB
C++
656 lines
20 KiB
C++
//
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// See the file "COPYING" in the main distribution directory for copyright.
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//
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#include "zeek/Reporter.h"
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#include <syslog.h>
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#include <unistd.h>
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#include "zeek/Conn.h"
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#include "zeek/Desc.h"
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#include "zeek/Event.h"
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#include "zeek/EventHandler.h"
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#include "zeek/Expr.h"
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#include "zeek/Frame.h"
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#include "zeek/ID.h"
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#include "zeek/RunState.h"
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#include "zeek/Timer.h"
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#include "zeek/file_analysis/File.h"
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#include "zeek/input.h"
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#include "zeek/plugin/Manager.h"
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#include "zeek/plugin/Plugin.h"
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#include "zeek/3rdparty/doctest.h"
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#ifdef SYSLOG_INT
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extern "C" {
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int openlog(const char* ident, int logopt, int facility);
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int syslog(int priority, const char* message_fmt, ...);
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int closelog();
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}
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#endif
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zeek::Reporter* zeek::reporter = nullptr;
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zeek::Reporter*& reporter = zeek::reporter;
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namespace zeek {
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Reporter::Reporter(bool arg_abort_on_scripting_errors) {
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abort_on_scripting_errors = arg_abort_on_scripting_errors;
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errors = 0;
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via_events = false;
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in_error_handler = 0;
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// Always use stderr at startup/init before scripts have been fully parsed
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// and zeek_init() processed.
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// Messages may otherwise be missed if an error occurs that prevents events
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// from ever being dispatched.
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info_to_stderr = true;
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warnings_to_stderr = true;
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errors_to_stderr = true;
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weird_count = 0;
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weird_sampling_rate = 0;
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weird_sampling_duration = 0;
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weird_sampling_threshold = 0;
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ignore_deprecations = false;
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syslog_open = false;
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}
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Reporter::~Reporter() { closelog(); }
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void Reporter::InitOptions() {
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info_to_stderr = id::find_val("Reporter::info_to_stderr")->AsBool();
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warnings_to_stderr = id::find_val("Reporter::warnings_to_stderr")->AsBool();
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errors_to_stderr = id::find_val("Reporter::errors_to_stderr")->AsBool();
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weird_sampling_rate = id::find_val("Weird::sampling_rate")->AsCount();
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weird_sampling_threshold = id::find_val("Weird::sampling_threshold")->AsCount();
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weird_sampling_duration = id::find_val("Weird::sampling_duration")->AsInterval();
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auto init_weird_set = [](WeirdSet* set, const char* name) {
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auto wl_val = id::find_val(name)->AsTableVal();
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auto wl_table = wl_val->AsTable();
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for ( const auto& wle : *wl_table ) {
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auto k = wle.GetHashKey();
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auto index = wl_val->RecreateIndex(*k);
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std::string key = index->Idx(0)->AsString()->CheckString();
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set->emplace(std::move(key));
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}
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};
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init_weird_set(&weird_sampling_whitelist, "Weird::sampling_whitelist");
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init_weird_set(&weird_sampling_global_list, "Weird::sampling_global_list");
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}
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void Reporter::Info(const char* fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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FILE* out = EmitToStderr(info_to_stderr) ? stderr : nullptr;
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DoLog("", reporter_info, out, nullptr, nullptr, true, true, nullptr, fmt, ap);
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va_end(ap);
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}
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void Reporter::Warning(const char* fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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FILE* out = EmitToStderr(warnings_to_stderr) ? stderr : nullptr;
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DoLog("warning", reporter_warning, out, nullptr, nullptr, true, true, nullptr, fmt, ap);
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va_end(ap);
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}
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void Reporter::Error(const char* fmt, ...) {
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++errors;
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va_list ap;
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va_start(ap, fmt);
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FILE* out = EmitToStderr(errors_to_stderr) ? stderr : nullptr;
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DoLog("error", reporter_error, out, nullptr, nullptr, true, true, nullptr, fmt, ap);
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va_end(ap);
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}
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void Reporter::FatalError(const char* fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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// Always log to stderr.
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DoLog("fatal error", nullptr, stderr, nullptr, nullptr, true, false, nullptr, fmt, ap);
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va_end(ap);
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util::detail::set_processing_status("TERMINATED", "fatal_error");
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fflush(stderr);
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fflush(stdout);
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_exit(1);
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}
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void Reporter::FatalErrorWithCore(const char* fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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// Always log to stderr.
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DoLog("fatal error", nullptr, stderr, nullptr, nullptr, true, false, nullptr, fmt, ap);
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va_end(ap);
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util::detail::set_processing_status("TERMINATED", "fatal_error");
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abort();
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}
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void Reporter::ExprRuntimeError(const detail::Expr* expr, const char* fmt, ...) {
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++errors;
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ODesc d;
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expr->Describe(&d);
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PushLocation(expr->GetLocationInfo());
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va_list ap;
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va_start(ap, fmt);
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FILE* out = EmitToStderr(errors_to_stderr) ? stderr : nullptr;
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DoLog("expression error", reporter_error, out, nullptr, nullptr, true, true, d.Description(), fmt, ap);
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va_end(ap);
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PopLocation();
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if ( abort_on_scripting_errors )
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abort();
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throw InterpreterException();
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}
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void Reporter::ExprRuntimeWarning(const detail::Expr* expr, const char* fmt, ...) {
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ODesc d;
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expr->Describe(&d);
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PushLocation(expr->GetLocationInfo());
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va_list ap;
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va_start(ap, fmt);
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FILE* out = EmitToStderr(warnings_to_stderr) ? stderr : nullptr;
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DoLog("expression warning", reporter_warning, out, nullptr, nullptr, true, true, d.Description(), fmt, ap);
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va_end(ap);
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PopLocation();
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}
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void Reporter::RuntimeError(const detail::Location* location, const char* fmt, ...) {
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++errors;
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PushLocation(location);
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va_list ap;
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va_start(ap, fmt);
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FILE* out = EmitToStderr(errors_to_stderr) ? stderr : nullptr;
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DoLog("runtime error", reporter_error, out, nullptr, nullptr, true, true, "", fmt, ap);
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va_end(ap);
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PopLocation();
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if ( abort_on_scripting_errors )
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abort();
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throw InterpreterException();
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}
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void Reporter::CPPRuntimeError(const char* fmt, ...) {
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++errors;
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va_list ap;
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va_start(ap, fmt);
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FILE* out = EmitToStderr(errors_to_stderr) ? stderr : nullptr;
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DoLog("runtime error in compiled code", reporter_error, out, nullptr, nullptr, true, true, "", fmt, ap);
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va_end(ap);
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if ( abort_on_scripting_errors )
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abort();
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throw InterpreterException();
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}
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void Reporter::CPPRuntimeWarning(const char* fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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FILE* out = EmitToStderr(warnings_to_stderr) ? stderr : nullptr;
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DoLog("runtime warning in compiled code", reporter_error, out, nullptr, nullptr, true, true, "", fmt, ap);
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va_end(ap);
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}
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void Reporter::InternalError(const char* fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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// Always log to stderr.
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DoLog("internal error", nullptr, stderr, nullptr, nullptr, true, false, nullptr, fmt, ap);
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va_end(ap);
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util::detail::set_processing_status("TERMINATED", "internal_error");
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abort();
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}
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void Reporter::AnalyzerError(analyzer::Analyzer* a, const char* fmt, ...) {
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if ( a )
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a->SetSkip(true);
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va_list ap;
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va_start(ap, fmt);
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// Always log to stderr.
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// TODO: would be nice to also log a call stack.
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DoLog("analyzer error", reporter_error, stderr, nullptr, nullptr, true, true, nullptr, fmt, ap);
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va_end(ap);
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}
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void Reporter::InternalWarning(const char* fmt, ...) {
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va_list ap;
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va_start(ap, fmt);
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FILE* out = EmitToStderr(warnings_to_stderr) ? stderr : nullptr;
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// TODO: would be nice to also log a call stack.
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DoLog("internal warning", reporter_warning, out, nullptr, nullptr, true, true, nullptr, fmt, ap);
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va_end(ap);
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}
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void Reporter::Syslog(const char* fmt, ...) {
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if ( run_state::reading_traces )
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return;
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if ( ! syslog_open ) {
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openlog("bro", 0, LOG_LOCAL5);
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syslog_open = true;
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}
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va_list ap;
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va_start(ap, fmt);
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vsyslog(LOG_NOTICE, fmt, ap);
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va_end(ap);
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}
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void Reporter::WeirdHelper(EventHandlerPtr event, ValPList vl, const char* fmt_name, ...) {
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va_list ap;
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va_start(ap, fmt_name);
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DoLog("weird", event, nullptr, nullptr, &vl, false, false, nullptr, fmt_name, ap);
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va_end(ap);
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}
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void Reporter::UpdateWeirdStats(const char* name) {
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++weird_count;
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++weird_count_by_type[name];
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}
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class NetWeirdTimer final : public detail::Timer {
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public:
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NetWeirdTimer(double t, const char* name, double timeout)
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: detail::Timer(t + timeout, detail::TIMER_NET_WEIRD_EXPIRE), weird_name(name) {}
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void Dispatch(double t, bool is_expire) override { reporter->ResetNetWeird(weird_name); }
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std::string weird_name;
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};
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class FlowWeirdTimer final : public detail::Timer {
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public:
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using IPPair = std::pair<IPAddr, IPAddr>;
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FlowWeirdTimer(double t, IPPair p, double timeout)
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: detail::Timer(t + timeout, detail::TIMER_FLOW_WEIRD_EXPIRE), endpoints(std::move(p)) {}
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void Dispatch(double t, bool is_expire) override { reporter->ResetFlowWeird(endpoints.first, endpoints.second); }
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IPPair endpoints;
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};
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class ConnTupleWeirdTimer final : public detail::Timer {
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public:
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using ConnTuple = Reporter::ConnTuple;
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ConnTupleWeirdTimer(double t, ConnTuple id, double timeout)
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: detail::Timer(t + timeout, detail::TIMER_CONN_TUPLE_WEIRD_EXPIRE), conn_id(std::move(id)) {}
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void Dispatch(double t, bool is_expire) override { reporter->ResetExpiredConnWeird(conn_id); }
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ConnTuple conn_id;
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};
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void Reporter::ResetNetWeird(const std::string& name) { net_weird_state.erase(name); }
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void Reporter::ResetFlowWeird(const IPAddr& orig, const IPAddr& resp) {
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flow_weird_state.erase(std::make_pair(orig, resp));
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}
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void Reporter::ResetExpiredConnWeird(const ConnTuple& id) { expired_conn_weird_state.erase(id); }
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Reporter::PermitWeird Reporter::CheckGlobalWeirdLists(const char* name) {
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if ( WeirdOnSamplingWhiteList(name) )
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return PermitWeird::Allow;
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if ( WeirdOnGlobalList(name) )
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// We track weirds on the global list through the "net_weird" table.
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return PermitNetWeird(name) ? PermitWeird::Allow : PermitWeird::Deny;
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return PermitWeird::Unknown;
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}
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bool Reporter::PermitNetWeird(const char* name) {
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auto& count = net_weird_state[name];
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++count;
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if ( count == 1 )
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detail::timer_mgr->Add(new NetWeirdTimer(run_state::network_time, name, weird_sampling_duration));
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if ( count <= weird_sampling_threshold )
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return true;
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auto num_above_threshold = count - weird_sampling_threshold;
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if ( weird_sampling_rate )
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return num_above_threshold % weird_sampling_rate == 0;
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else
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return false;
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}
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bool Reporter::PermitFlowWeird(const char* name, const IPAddr& orig, const IPAddr& resp) {
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auto endpoints = std::make_pair(orig, resp);
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auto& map = flow_weird_state[endpoints];
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if ( map.empty() )
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detail::timer_mgr->Add(new FlowWeirdTimer(run_state::network_time, endpoints, weird_sampling_duration));
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auto& count = map[name];
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++count;
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if ( count <= weird_sampling_threshold )
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return true;
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auto num_above_threshold = count - weird_sampling_threshold;
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if ( weird_sampling_rate )
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return num_above_threshold % weird_sampling_rate == 0;
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else
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return false;
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}
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bool Reporter::PermitExpiredConnWeird(const char* name, const RecordVal& conn_id) {
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if ( ! conn_id.HasField("orig_h") || ! conn_id.HasField("resp_h") || ! conn_id.HasField("orig_p") ||
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! conn_id.HasField("resp_p") )
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return false;
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auto conn_tuple =
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std::make_tuple(conn_id.GetFieldAs<AddrVal>("orig_h"), conn_id.GetFieldAs<AddrVal>("resp_h"),
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conn_id.GetFieldAs<PortVal>("orig_p")->Port(), conn_id.GetFieldAs<PortVal>("resp_p")->Port(),
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conn_id.GetFieldAs<PortVal>("resp_p")->PortType());
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auto& map = expired_conn_weird_state[conn_tuple];
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if ( map.empty() )
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detail::timer_mgr->Add(
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new ConnTupleWeirdTimer(run_state::network_time, std::move(conn_tuple), weird_sampling_duration));
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auto& count = map[name];
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++count;
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if ( count <= weird_sampling_threshold )
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return true;
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auto num_above_threshold = count - weird_sampling_threshold;
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if ( weird_sampling_rate )
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return num_above_threshold % weird_sampling_rate == 0;
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else
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return false;
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}
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void Reporter::Weird(const char* name, const char* addl, const char* source) {
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UpdateWeirdStats(name);
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if ( ! WeirdOnSamplingWhiteList(name) ) {
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if ( ! PermitNetWeird(name) )
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return;
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}
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WeirdHelper(net_weird, {new StringVal(addl), new StringVal(source)}, "%s", name);
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}
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void Reporter::Weird(file_analysis::File* f, const char* name, const char* addl, const char* source) {
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UpdateWeirdStats(name);
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switch ( CheckGlobalWeirdLists(name) ) {
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case PermitWeird::Allow: break;
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case PermitWeird::Deny: return;
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case PermitWeird::Unknown:
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if ( ! f->PermitWeird(name, weird_sampling_threshold, weird_sampling_rate, weird_sampling_duration) )
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return;
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}
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WeirdHelper(file_weird, {f->ToVal()->Ref(), new StringVal(addl), new StringVal(source)}, "%s", name);
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}
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void Reporter::Weird(Connection* conn, const char* name, const char* addl, const char* source) {
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UpdateWeirdStats(name);
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switch ( CheckGlobalWeirdLists(name) ) {
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case PermitWeird::Allow: break;
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case PermitWeird::Deny: return;
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case PermitWeird::Unknown:
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if ( ! conn->PermitWeird(name, weird_sampling_threshold, weird_sampling_rate, weird_sampling_duration) )
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return;
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}
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WeirdHelper(conn_weird, {conn->GetVal()->Ref(), new StringVal(addl), new StringVal(source)}, "%s", name);
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}
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void Reporter::Weird(RecordValPtr conn_id, StringValPtr uid, const char* name, const char* addl, const char* source) {
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UpdateWeirdStats(name);
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switch ( CheckGlobalWeirdLists(name) ) {
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case PermitWeird::Allow: break;
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case PermitWeird::Deny: return;
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case PermitWeird::Unknown:
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if ( ! PermitExpiredConnWeird(name, *conn_id) )
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return;
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}
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WeirdHelper(expired_conn_weird, {conn_id.release(), uid.release(), new StringVal(addl), new StringVal(source)},
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"%s", name);
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}
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void Reporter::Weird(const IPAddr& orig, const IPAddr& resp, const char* name, const char* addl, const char* source) {
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UpdateWeirdStats(name);
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switch ( CheckGlobalWeirdLists(name) ) {
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case PermitWeird::Allow: break;
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case PermitWeird::Deny: return;
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case PermitWeird::Unknown:
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if ( ! PermitFlowWeird(name, orig, resp) )
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return;
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}
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WeirdHelper(flow_weird, {new AddrVal(orig), new AddrVal(resp), new StringVal(addl), new StringVal(source)}, "%s",
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name);
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}
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void Reporter::Deprecation(std::string_view msg, const detail::Location* loc1, const detail::Location* loc2) {
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if ( ignore_deprecations )
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return;
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if ( loc1 || loc2 )
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PushLocation(loc1, loc2);
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Warning("%s", msg.data());
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if ( loc1 || loc2 )
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PopLocation();
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}
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void Reporter::DoLog(const char* prefix, EventHandlerPtr event, FILE* out, Connection* conn, ValPList* addl,
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bool location, bool time, const char* postfix, const char* fmt, va_list ap) {
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static char tmp[512];
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int size = sizeof(tmp);
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char* buffer = tmp;
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char* allocated = nullptr;
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std::string loc_str;
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if ( location ) {
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std::string loc_file = "";
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int loc_line = 0;
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if ( locations.size() ) {
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ODesc d;
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std::pair<const detail::Location*, const detail::Location*> locs = locations.back();
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if ( locs.first ) {
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if ( locs.first != &detail::no_location )
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locs.first->Describe(&d);
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else
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d.Add("<no location>");
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if ( locs.second ) {
|
|
d.Add(" and ");
|
|
|
|
if ( locs.second != &detail::no_location )
|
|
locs.second->Describe(&d);
|
|
|
|
else
|
|
d.Add("<no location>");
|
|
}
|
|
}
|
|
|
|
loc_str = d.Description();
|
|
}
|
|
|
|
else if ( filename && *filename ) {
|
|
// Take from globals.
|
|
loc_str = filename;
|
|
char tmp[32];
|
|
snprintf(tmp, 32, "%d", line_number);
|
|
loc_str += std::string(", line ") + std::string(tmp);
|
|
}
|
|
}
|
|
|
|
while ( true ) {
|
|
va_list aq;
|
|
va_copy(aq, ap);
|
|
int n = vsnprintf(buffer, size, fmt, aq);
|
|
va_end(aq);
|
|
|
|
if ( postfix )
|
|
n += strlen(postfix) + 10; // Add a bit of slack.
|
|
|
|
if ( n > -1 && n < size )
|
|
// We had enough space;
|
|
break;
|
|
|
|
// Enlarge buffer;
|
|
size *= 2;
|
|
buffer = allocated = (char*)realloc(allocated, size);
|
|
|
|
if ( ! buffer )
|
|
FatalError("out of memory in Reporter");
|
|
}
|
|
|
|
if ( postfix && *postfix )
|
|
// Note, if you change this fmt string, adjust the additional
|
|
// buffer size above.
|
|
snprintf(buffer + strlen(buffer), size - strlen(buffer), " (%s)", postfix);
|
|
|
|
bool raise_event = true;
|
|
|
|
if ( via_events && ! in_error_handler ) {
|
|
if ( locations.size() ) {
|
|
auto locs = locations.back();
|
|
raise_event = PLUGIN_HOOK_WITH_RESULT(HOOK_REPORTER,
|
|
HookReporter(prefix, event, conn, addl, location, locs.first,
|
|
locs.second, time, buffer),
|
|
true);
|
|
}
|
|
else
|
|
raise_event = PLUGIN_HOOK_WITH_RESULT(HOOK_REPORTER,
|
|
HookReporter(prefix, event, conn, addl, location, nullptr, nullptr,
|
|
time, buffer),
|
|
true);
|
|
}
|
|
|
|
if ( raise_event && event && via_events && ! in_error_handler ) {
|
|
auto vl_size = 1 + (bool)time + (bool)location + (bool)conn + (addl ? addl->length() : 0);
|
|
|
|
Args vl;
|
|
vl.reserve(vl_size);
|
|
|
|
if ( time )
|
|
vl.emplace_back(
|
|
make_intrusive<TimeVal>(run_state::network_time ? run_state::network_time : util::current_time()));
|
|
|
|
vl.emplace_back(make_intrusive<StringVal>(buffer));
|
|
|
|
if ( location )
|
|
vl.emplace_back(make_intrusive<StringVal>(loc_str.c_str()));
|
|
|
|
if ( conn )
|
|
vl.emplace_back(conn->GetVal());
|
|
|
|
if ( addl )
|
|
for ( auto v : *addl )
|
|
vl.emplace_back(AdoptRef{}, v);
|
|
|
|
if ( conn )
|
|
conn->EnqueueEvent(event, nullptr, std::move(vl));
|
|
else
|
|
event_mgr.Enqueue(event, std::move(vl));
|
|
}
|
|
else {
|
|
if ( addl ) {
|
|
for ( const auto& av : *addl )
|
|
Unref(av);
|
|
}
|
|
}
|
|
|
|
if ( out ) {
|
|
std::string s = "";
|
|
|
|
if ( run_state::zeek_start_network_time != 0.0 ) {
|
|
char tmp[32];
|
|
snprintf(tmp, 32, "%.6f", run_state::network_time);
|
|
s += std::string(tmp) + " ";
|
|
}
|
|
|
|
if ( prefix && *prefix ) {
|
|
if ( loc_str != "" )
|
|
s += std::string(prefix) + " in " + loc_str + ": ";
|
|
else
|
|
s += std::string(prefix) + ": ";
|
|
}
|
|
|
|
else {
|
|
if ( loc_str != "" )
|
|
s += loc_str + ": ";
|
|
}
|
|
|
|
s += buffer;
|
|
|
|
#ifdef ENABLE_ZEEK_UNIT_TESTS
|
|
if ( doctest::is_running_in_test ) {
|
|
try {
|
|
MESSAGE(s);
|
|
} catch ( const doctest::detail::TestFailureException& e ) {
|
|
// If doctest throws an exception, just write the string out to stdout
|
|
// like normal, just so it's captured somewhere.
|
|
fprintf(out, "%s\n", s.c_str());
|
|
}
|
|
}
|
|
else {
|
|
#endif
|
|
s += "\n";
|
|
fprintf(out, "%s", s.c_str());
|
|
#ifdef ENABLE_ZEEK_UNIT_TESTS
|
|
}
|
|
#endif
|
|
}
|
|
|
|
if ( allocated )
|
|
free(allocated);
|
|
}
|
|
|
|
bool Reporter::EmitToStderr(bool flag) { return flag || ! run_state::detail::zeek_init_done; }
|
|
|
|
ScriptLocationScope::ScriptLocationScope(const zeek::detail::Frame* frame) {
|
|
zeek::reporter->PushLocation(frame->GetCallLocation());
|
|
}
|
|
|
|
ScriptLocationScope::~ScriptLocationScope() { zeek::reporter->PopLocation(); }
|
|
|
|
} // namespace zeek
|