337 lines
11 KiB
C++
337 lines
11 KiB
C++
// Copyright 2014 The Crashpad Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <fcntl.h>
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#include <getopt.h>
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#include <libgen.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <algorithm>
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#include <string>
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#include <vector>
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#include "base/apple/mach_logging.h"
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#include "base/files/scoped_file.h"
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#include "base/logging.h"
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#include "tools/tool_support.h"
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#include "util/mach/bootstrap.h"
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#include "util/mach/exc_server_variants.h"
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#include "util/mach/exception_behaviors.h"
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#include "util/mach/exception_types.h"
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#include "util/mach/mach_extensions.h"
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#include "util/mach/mach_message.h"
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#include "util/mach/mach_message_server.h"
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#include "util/mach/symbolic_constants_mach.h"
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#include "util/posix/symbolic_constants_posix.h"
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#include "util/stdlib/string_number_conversion.h"
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namespace crashpad {
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namespace {
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struct Options {
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std::string file_path;
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std::string mach_service;
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FILE* file;
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int timeout_secs;
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bool has_timeout;
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MachMessageServer::Persistent persistent;
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};
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class ExceptionServer final : public UniversalMachExcServer::Interface {
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public:
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ExceptionServer(const Options& options,
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const std::string& me,
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int* exceptions_handled)
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: UniversalMachExcServer::Interface(),
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options_(options),
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me_(me),
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exceptions_handled_(exceptions_handled) {}
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// UniversalMachExcServer::Interface:
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virtual kern_return_t CatchMachException(
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exception_behavior_t behavior,
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exception_handler_t exception_port,
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thread_t thread,
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task_t task,
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exception_type_t exception,
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const mach_exception_data_type_t* code,
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mach_msg_type_number_t code_count,
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thread_state_flavor_t* flavor,
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ConstThreadState old_state,
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mach_msg_type_number_t old_state_count,
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thread_state_t new_state,
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mach_msg_type_number_t* new_state_count,
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const mach_msg_trailer_t* trailer,
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bool* destroy_complex_request) override {
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*destroy_complex_request = true;
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++*exceptions_handled_;
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fprintf(options_.file,
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"%s: behavior %s",
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me_.c_str(),
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ExceptionBehaviorToString(
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behavior, kUseFullName | kUnknownIsNumeric | kUseOr).c_str());
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kern_return_t kr;
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if (ExceptionBehaviorHasIdentity(behavior)) {
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// It’s not possible to call pid_for_task() once EXC_CORPSE_NOTIFY has
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// been generated. It is possible to obtain the process ID by mapping the
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// corpse kcdata area from the task’s address space at code[0] (size
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// code[1]) and locating TASK_CRASHINFO_PID within that area. This area
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// also includes TASK_CRASHINFO_CRASHED_THREADID which could be used
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// instead of thread_info() below, and TASK_CRASHINFO_EXCEPTION_CODES
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// which could be used to recover the exception codes passed to the
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// EXC_CRASH handler. None of this is currently done because corpses are a
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// new 10.11-only feature. See 10.11 <corpses/task_corpse.h> and
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// <kern/kern_cdata.h>.
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if (exception != EXC_CORPSE_NOTIFY) {
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pid_t pid;
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kr = pid_for_task(task, &pid);
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if (kr != KERN_SUCCESS) {
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fprintf(options_.file, "\n");
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fflush(options_.file);
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MACH_LOG(ERROR, kr) << "pid_for_task";
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return KERN_FAILURE;
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}
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fprintf(options_.file, ", pid %d", pid);
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}
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thread_identifier_info identifier_info;
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mach_msg_type_number_t count = THREAD_IDENTIFIER_INFO_COUNT;
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kr = thread_info(thread,
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THREAD_IDENTIFIER_INFO,
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reinterpret_cast<thread_info_t>(&identifier_info),
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&count);
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if (kr != KERN_SUCCESS) {
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fprintf(options_.file, "\n");
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fflush(options_.file);
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MACH_LOG(ERROR, kr) << "thread_info";
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return KERN_FAILURE;
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}
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fprintf(options_.file, ", thread %lld", identifier_info.thread_id);
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}
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fprintf(
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options_.file,
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", exception %s, codes[%d]",
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ExceptionToString(exception, kUseFullName | kUnknownIsNumeric).c_str(),
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code_count);
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for (size_t index = 0; index < code_count; ++index) {
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fprintf(options_.file,
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"%s %#llx",
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index != 0 ? "," : "",
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code[index]);
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}
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if (exception == EXC_CRASH) {
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mach_exception_code_t original_code_0;
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int signal;
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exception_type_t original_exception =
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ExcCrashRecoverOriginalException(code[0], &original_code_0, &signal);
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fprintf(options_.file,
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", original exception %s, original code[0] %lld, signal %s",
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ExceptionToString(original_exception,
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kUseFullName | kUnknownIsNumeric).c_str(),
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original_code_0,
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SignalToString(signal, kUseFullName | kUnknownIsNumeric).c_str());
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}
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if (ExceptionBehaviorHasState(behavior)) {
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std::string flavor_string =
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ThreadStateFlavorToString(*flavor, kUseFullName | kUnknownIsNumeric);
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fprintf(options_.file,
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", flavor %s, old_state_count %d",
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flavor_string.c_str(),
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old_state_count);
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}
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fprintf(options_.file, "\n");
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fflush(options_.file);
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if (exception != EXC_CRASH && exception != kMachExceptionSimulated) {
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// Find another handler.
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return KERN_FAILURE;
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}
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ExcServerCopyState(
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behavior, old_state, old_state_count, new_state, new_state_count);
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return ExcServerSuccessfulReturnValue(exception, behavior, false);
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}
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private:
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const Options& options_;
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const std::string& me_;
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int* exceptions_handled_;
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};
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void Usage(const std::string& me) {
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// clang-format off
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fprintf(stderr,
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"Usage: %s -m SERVICE [OPTION]...\n"
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"Catch Mach exceptions and display information about them.\n"
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"\n"
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" -f, --file=FILE append information to FILE instead of stdout\n"
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" -m, --mach-service=SERVICE register SERVICE with the bootstrap server\n"
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" -p, --persistent continue processing exceptions after the first\n"
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" -t, --timeout=TIMEOUT run for a maximum of TIMEOUT seconds\n"
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" --help display this help and exit\n"
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" --version output version information and exit\n",
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me.c_str());
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// clang-format on
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ToolSupport::UsageTail(me);
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}
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int CatchExceptionToolMain(int argc, char* argv[]) {
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const std::string me(basename(argv[0]));
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enum OptionFlags {
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// “Short” (single-character) options.
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kOptionFile = 'f',
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kOptionMachService = 'm',
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kOptionPersistent = 'p',
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kOptionTimeout = 't',
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// Long options without short equivalents.
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kOptionLastChar = 255,
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// Standard options.
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kOptionHelp = -2,
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kOptionVersion = -3,
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};
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Options options = {};
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static constexpr option long_options[] = {
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{"file", required_argument, nullptr, kOptionFile},
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{"mach-service", required_argument, nullptr, kOptionMachService},
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{"persistent", no_argument, nullptr, kOptionPersistent},
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{"timeout", required_argument, nullptr, kOptionTimeout},
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{"help", no_argument, nullptr, kOptionHelp},
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{"version", no_argument, nullptr, kOptionVersion},
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{nullptr, 0, nullptr, 0},
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};
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int opt;
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while ((opt = getopt_long(argc, argv, "f:m:pt:", long_options, nullptr)) !=
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-1) {
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switch (opt) {
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case kOptionFile:
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options.file_path = optarg;
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break;
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case kOptionMachService:
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options.mach_service = optarg;
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break;
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case kOptionPersistent:
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options.persistent = MachMessageServer::kPersistent;
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break;
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case kOptionTimeout:
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if (!StringToNumber(optarg, &options.timeout_secs) ||
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options.timeout_secs < 0) {
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ToolSupport::UsageHint(me, "-t requires a zero or positive TIMEOUT");
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return EXIT_FAILURE;
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}
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options.has_timeout = true;
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break;
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case kOptionHelp:
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Usage(me);
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return EXIT_SUCCESS;
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case kOptionVersion:
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ToolSupport::Version(me);
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return EXIT_SUCCESS;
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default:
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ToolSupport::UsageHint(me, nullptr);
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return EXIT_FAILURE;
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}
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}
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argc -= optind;
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argv += optind;
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if (options.mach_service.empty()) {
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ToolSupport::UsageHint(me, "-m is required");
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return EXIT_FAILURE;
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}
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base::apple::ScopedMachReceiveRight service_port(
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BootstrapCheckIn(options.mach_service));
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if (service_port == kMachPortNull) {
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return EXIT_FAILURE;
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}
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base::ScopedFILE file_owner;
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if (options.file_path.empty()) {
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options.file = stdout;
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} else {
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file_owner.reset(fopen(options.file_path.c_str(), "a"));
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if (!file_owner.get()) {
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PLOG(ERROR) << "fopen " << options.file_path;
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return EXIT_FAILURE;
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}
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options.file = file_owner.get();
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if (fcntl(fileno(options.file), F_SETFD, FD_CLOEXEC) == -1) {
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PLOG(ERROR) << "fcntl " << options.file_path;
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return EXIT_FAILURE;
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}
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}
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int exceptions_handled = 0;
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ExceptionServer exception_server(options, me, &exceptions_handled);
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UniversalMachExcServer universal_mach_exc_server(&exception_server);
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// Assume that if persistent mode has been requested, it’s desirable to ignore
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// large messages and keep running.
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MachMessageServer::ReceiveLarge receive_large =
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(options.persistent == MachMessageServer::kPersistent)
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? MachMessageServer::kReceiveLargeIgnore
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: MachMessageServer::kReceiveLargeError;
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mach_msg_timeout_t timeout_ms;
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if (!options.has_timeout) {
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timeout_ms = kMachMessageTimeoutWaitIndefinitely;
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} else if (options.timeout_secs == 0) {
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timeout_ms = kMachMessageTimeoutNonblocking;
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} else {
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timeout_ms = options.timeout_secs * 1000;
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}
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mach_msg_return_t mr = MachMessageServer::Run(&universal_mach_exc_server,
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service_port.get(),
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MACH_MSG_OPTION_NONE,
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options.persistent,
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receive_large,
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timeout_ms);
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if (mr == MACH_RCV_TIMED_OUT && options.has_timeout && options.persistent &&
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exceptions_handled) {
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// This is not an error: when exiting on timeout during persistent
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// processing and at least one exception was handled, it’s considered a
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// success.
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} else if (mr != MACH_MSG_SUCCESS) {
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MACH_LOG(ERROR, mr) << "MachMessageServer::Run";
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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} // namespace
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} // namespace crashpad
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int main(int argc, char* argv[]) {
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return crashpad::CatchExceptionToolMain(argc, argv);
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}
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