main.cc - platform/system/linkerconfig - Gitiles

 /*
  * Copyright (C) 2019 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <climits>
 #include <cstdlib>
 #include <cstring>
 #include <fstream>
 #include <iostream>
 #include <string>

 #include <errno.h>
 #include <fcntl.h>
 #include <getopt.h>
 #include <sys/stat.h>
 #include <sys/types.h>

 #include <android-base/result.h>

 #include "linkerconfig/apex.h"
 #include "linkerconfig/apexconfig.h"
 #include "linkerconfig/baseconfig.h"
 #include "linkerconfig/context.h"
 #include "linkerconfig/environment.h"
 #include "linkerconfig/legacy.h"
 #include "linkerconfig/log.h"
 #include "linkerconfig/namespacebuilder.h"
 #include "linkerconfig/recovery.h"
 #include "linkerconfig/variableloader.h"
 #include "linkerconfig/variables.h"

 using android::base::ErrnoError;
 using android::base::Error;
 using android::base::Result;
 using android::linkerconfig::contents::Context;
 using android::linkerconfig::modules::ApexInfo;
 using android::linkerconfig::modules::Configuration;

 namespace {
 const static struct option program_options[] = {
     {"target", required_argument, 0, 't'},
     {"strict", no_argument, 0, 's'},
 #ifndef __ANDROID__
     {"root", required_argument, 0, 'r'},
     {"vndk", required_argument, 0, 'v'},
     {"recovery", no_argument, 0, 'y'},
     {"legacy", no_argument, 0, 'l'},
 #endif
     {"help", no_argument, 0, 'h'},
     {0, 0, 0, 0}};

 struct ProgramArgs {
   std::string target_directory;
   bool strict;
   std::string root;
   std::string vndk_version;
   bool is_recovery;
   bool is_legacy;
 };

 [[noreturn]] void PrintUsage(int status = EXIT_SUCCESS) {
   std::cerr << "Usage : linkerconfig [--target <target_directory>]"
                " [--strict]"
 #ifndef __ANDROID__
                " --root <root dir>"
                " --vndk <vndk version>"
                " --recovery"
                " --legacy"
 #endif
                " [--help]"
             << std::endl;
   exit(status);
 }

 std::string RealPath(std::string_view path) {
   char resolved_path[PATH_MAX];
   if (realpath(path.data(), resolved_path) != nullptr) {
     return resolved_path;
   }
   PrintUsage(-1);
 }

 bool ParseArgs(int argc, char* argv[], ProgramArgs* args) {
   int parse_result;
   while ((parse_result = getopt_long(
               argc, argv, "t:sr:v:hyl", program_options, NULL)) != -1) {
     switch (parse_result) {
       case 't':
         args->target_directory = optarg;
         break;
       case 's':
         args->strict = true;
         break;
       case 'r':
         args->root = RealPath(optarg);
         break;
       case 'v':
         args->vndk_version = optarg;
         break;
       case 'y':
         args->is_recovery = true;
         break;
       case 'l':
         args->is_legacy = true;
         break;
       case 'h':
         PrintUsage();
       default:
         return false;
     }
   }

   if (optind < argc) {
     return false;
   }

   return true;
 }

 void LoadVariables(ProgramArgs args) {
 #ifndef __ANDROID__
   if (!args.is_recovery && (args.root == "" || args.vndk_version == "")) {
     PrintUsage();
   }
   android::linkerconfig::modules::Variables::AddValue("ro.vndk.version",
                                                       args.vndk_version);
 #endif

   if (!args.is_recovery) {
     android::linkerconfig::generator::LoadVariables(args.root);
   }
 }

 Result<void> WriteConfigurationToFile(Configuration& conf,
                                       std::string file_path) {
   std::ostream* out = &std::cout;
   std::ofstream file_out;

   if (file_path != "") {
     file_out.open(file_path);
     if (file_out.fail()) {
       return ErrnoError() << "Failed to open file " << file_path;
     }
     out = &file_out;
   }

   android::linkerconfig::modules::ConfigWriter config_writer;

   conf.WriteConfig(config_writer);
   *out << config_writer.ToString();
   if (!out->good()) {
     return ErrnoError() << "Failed to write content to " << file_path;
   }

   return {};
 }

 Result<void> UpdatePermission([[maybe_unused]] const std::string& file_path) {
 #ifdef __ANDROID__
   if (fchmodat(AT_FDCWD,
                file_path.c_str(),
                S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH,
                AT_SYMLINK_NOFOLLOW) < 0) {
     return ErrnoError() << "Failed to update permission of " << file_path;
   }
 #endif

   return {};
 }

 Context GetContext(ProgramArgs args) {
   auto apex_list = android::linkerconfig::modules::ScanActiveApexes(args.root);
   Context ctx;
   for (auto const& apex_item : apex_list) {
     auto apex_info = apex_item.second;
     if (apex_info.has_bin || apex_info.has_lib) {
       ctx.AddApexModule(std::move(apex_info));
     }
   }
   if (args.strict) {
     ctx.SetStrictMode(true);
   }
   android::linkerconfig::contents::RegisterApexNamespaceBuilders(ctx);
   return ctx;
 }

 Configuration GetConfiguration(Context& ctx) {
   if (android::linkerconfig::modules::IsRecoveryMode()) {
     return android::linkerconfig::contents::CreateRecoveryConfiguration(ctx);
   }

   if (android::linkerconfig::modules::IsLegacyDevice()) {
     return android::linkerconfig::contents::CreateLegacyConfiguration(ctx);
   }

   // Use base configuration in default
   return android::linkerconfig::contents::CreateBaseConfiguration(ctx);
 }

 Result<void> GenerateConfiguration(Configuration config, std::string dir_path,
                                    bool update_permission) {
   std::string file_path = "";
   if (dir_path != "") {
     file_path = dir_path + "/ld.config.txt";
   }

   auto write_config = WriteConfigurationToFile(config, file_path);
   if (!write_config.ok()) {
     return write_config;
   } else if (update_permission && file_path != "") {
     return UpdatePermission(file_path);
   }

   return {};
 }

 Result<void> GenerateBaseLinkerConfiguration(Context& ctx,
                                              const std::string& dir_path) {
   return GenerateConfiguration(GetConfiguration(ctx), dir_path, true);
 }

 Result<void> GenerateRecoveryLinkerConfiguration(Context& ctx,
                                                  const std::string& dir_path) {
   return GenerateConfiguration(
       android::linkerconfig::contents::CreateRecoveryConfiguration(ctx),
       dir_path,
       false);
 }

 Result<void> GenerateLegacyLinkerConfiguration(Context& ctx,
                                                const std::string& dir_path) {
   return GenerateConfiguration(
       android::linkerconfig::contents::CreateLegacyConfiguration(ctx),
       dir_path,
       false);
 }

 Result<void> GenerateApexConfiguration(
     const std::string& base_dir, android::linkerconfig::contents::Context& ctx,
     const android::linkerconfig::modules::ApexInfo& target_apex) {
   std::string dir_path = base_dir + "/" + target_apex.name;
   if (auto ret = mkdir(dir_path.c_str(), 0755); ret != 0 && errno != EEXIST) {
     return ErrnoError() << "Failed to create directory " << dir_path;
   }

   return GenerateConfiguration(
       android::linkerconfig::contents::CreateApexConfiguration(ctx, target_apex),
       dir_path,
       true);
 }

 void GenerateApexConfigurations(Context& ctx, const std::string& dir_path) {
   for (auto const& apex_item : ctx.GetApexModules()) {
     if (apex_item.has_bin) {
       auto result = GenerateApexConfiguration(dir_path, ctx, apex_item);
       if (!result.ok()) {
         LOG(WARNING) << result.error();
       }
     }
   }
 }

 void ExitOnFailure(Result<void> task) {
   if (!task.ok()) {
     LOG(FATAL) << task.error();
     exit(EXIT_FAILURE);
   }
 }

 #ifdef __ANDROID__
 struct CombinedLogger {
   android::base::LogdLogger logd;

   void operator()(android::base::LogId id, android::base::LogSeverity severity,
                   const char* tag, const char* file, unsigned int line,
                   const char* message) {
     logd(id, severity, tag, file, line, message);
     KernelLogger(id, severity, tag, file, line, message);
   }
 };
 #endif
 }  // namespace

 int main(int argc, char* argv[]) {
   android::base::InitLogging(argv
 #ifdef __ANDROID__
                              ,
                              CombinedLogger()
 #endif
   );

   ProgramArgs args = {};

   if (!ParseArgs(argc, argv, &args)) {
     PrintUsage(EXIT_FAILURE);
   }

   LoadVariables(args);
   Context ctx = GetContext(args);

   // when exec'ed from init, this is 0x0077, which makes the subdirectories
   // inaccessible for others. set umask to 0x0022 so that they can be
   // accessible.
   umask(0x0022);

   if (args.is_recovery) {
     ExitOnFailure(
         GenerateRecoveryLinkerConfiguration(ctx, args.target_directory));
   } else if (args.is_legacy) {
     ExitOnFailure(GenerateLegacyLinkerConfiguration(ctx, args.target_directory));
   } else {
     ExitOnFailure(GenerateBaseLinkerConfiguration(ctx, args.target_directory));
     GenerateApexConfigurations(ctx, args.target_directory);
   }

   return EXIT_SUCCESS;
 }
	/*
	* Copyright (C) 2019 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <climits>
	#include <cstdlib>
	#include <cstring>
	#include <fstream>
	#include <iostream>
	#include <string>

	#include <errno.h>
	#include <fcntl.h>
	#include <getopt.h>
	#include <sys/stat.h>
	#include <sys/types.h>

	#include <android-base/result.h>

	#include "linkerconfig/apex.h"
	#include "linkerconfig/apexconfig.h"
	#include "linkerconfig/baseconfig.h"
	#include "linkerconfig/context.h"
	#include "linkerconfig/environment.h"
	#include "linkerconfig/legacy.h"
	#include "linkerconfig/log.h"
	#include "linkerconfig/namespacebuilder.h"
	#include "linkerconfig/recovery.h"
	#include "linkerconfig/variableloader.h"
	#include "linkerconfig/variables.h"

	using android::base::ErrnoError;
	using android::base::Error;
	using android::base::Result;
	using android::linkerconfig::contents::Context;
	using android::linkerconfig::modules::ApexInfo;
	using android::linkerconfig::modules::Configuration;

	namespace {
	const static struct option program_options[] = {
	{"target", required_argument, 0, 't'},
	{"strict", no_argument, 0, 's'},
	#ifndef __ANDROID__
	{"root", required_argument, 0, 'r'},
	{"vndk", required_argument, 0, 'v'},
	{"recovery", no_argument, 0, 'y'},
	{"legacy", no_argument, 0, 'l'},
	#endif
	{"help", no_argument, 0, 'h'},
	{0, 0, 0, 0}};

	struct ProgramArgs {
	std::string target_directory;
	bool strict;
	std::string root;
	std::string vndk_version;
	bool is_recovery;
	bool is_legacy;
	};

	[[noreturn]] void PrintUsage(int status = EXIT_SUCCESS) {
	std::cerr << "Usage : linkerconfig [--target <target_directory>]"
	" [--strict]"
	#ifndef __ANDROID__
	" --root <root dir>"
	" --vndk <vndk version>"
	" --recovery"
	" --legacy"
	#endif
	" [--help]"
	<< std::endl;
	exit(status);
	}

	std::string RealPath(std::string_view path) {
	char resolved_path[PATH_MAX];
	if (realpath(path.data(), resolved_path) != nullptr) {
	return resolved_path;
	}
	PrintUsage(-1);
	}

	bool ParseArgs(int argc, char* argv[], ProgramArgs* args) {
	int parse_result;
	while ((parse_result = getopt_long(
	argc, argv, "t:sr:v:hyl", program_options, NULL)) != -1) {
	switch (parse_result) {
	case 't':
	args->target_directory = optarg;
	break;
	case 's':
	args->strict = true;
	break;
	case 'r':
	args->root = RealPath(optarg);
	break;
	case 'v':
	args->vndk_version = optarg;
	break;
	case 'y':
	args->is_recovery = true;
	break;
	case 'l':
	args->is_legacy = true;
	break;
	case 'h':
	PrintUsage();
	default:
	return false;
	}
	}

	if (optind < argc) {
	return false;
	}

	return true;
	}

	void LoadVariables(ProgramArgs args) {
	#ifndef __ANDROID__
	if (!args.is_recovery && (args.root == "" \|\| args.vndk_version == "")) {
	PrintUsage();
	}
	android::linkerconfig::modules::Variables::AddValue("ro.vndk.version",
	args.vndk_version);
	#endif

	if (!args.is_recovery) {
	android::linkerconfig::generator::LoadVariables(args.root);
	}
	}

	Result<void> WriteConfigurationToFile(Configuration& conf,
	std::string file_path) {
	std::ostream* out = &std::cout;
	std::ofstream file_out;

	if (file_path != "") {
	file_out.open(file_path);
	if (file_out.fail()) {
	return ErrnoError() << "Failed to open file " << file_path;
	}
	out = &file_out;
	}

	android::linkerconfig::modules::ConfigWriter config_writer;

	conf.WriteConfig(config_writer);
	*out << config_writer.ToString();
	if (!out->good()) {
	return ErrnoError() << "Failed to write content to " << file_path;
	}

	return {};
	}

	Result<void> UpdatePermission([[maybe_unused]] const std::string& file_path) {
	#ifdef __ANDROID__
	if (fchmodat(AT_FDCWD,
	file_path.c_str(),
	S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IROTH,
	AT_SYMLINK_NOFOLLOW) < 0) {
	return ErrnoError() << "Failed to update permission of " << file_path;
	}
	#endif

	return {};
	}

	Context GetContext(ProgramArgs args) {
	auto apex_list = android::linkerconfig::modules::ScanActiveApexes(args.root);
	Context ctx;
	for (auto const& apex_item : apex_list) {
	auto apex_info = apex_item.second;
	if (apex_info.has_bin \|\| apex_info.has_lib) {
	ctx.AddApexModule(std::move(apex_info));
	}
	}
	if (args.strict) {
	ctx.SetStrictMode(true);
	}
	android::linkerconfig::contents::RegisterApexNamespaceBuilders(ctx);
	return ctx;
	}

	Configuration GetConfiguration(Context& ctx) {
	if (android::linkerconfig::modules::IsRecoveryMode()) {
	return android::linkerconfig::contents::CreateRecoveryConfiguration(ctx);
	}

	if (android::linkerconfig::modules::IsLegacyDevice()) {
	return android::linkerconfig::contents::CreateLegacyConfiguration(ctx);
	}

	// Use base configuration in default
	return android::linkerconfig::contents::CreateBaseConfiguration(ctx);
	}

	Result<void> GenerateConfiguration(Configuration config, std::string dir_path,
	bool update_permission) {
	std::string file_path = "";
	if (dir_path != "") {
	file_path = dir_path + "/ld.config.txt";
	}

	auto write_config = WriteConfigurationToFile(config, file_path);
	if (!write_config.ok()) {
	return write_config;
	} else if (update_permission && file_path != "") {
	return UpdatePermission(file_path);
	}

	return {};
	}

	Result<void> GenerateBaseLinkerConfiguration(Context& ctx,
	const std::string& dir_path) {
	return GenerateConfiguration(GetConfiguration(ctx), dir_path, true);
	}

	Result<void> GenerateRecoveryLinkerConfiguration(Context& ctx,
	const std::string& dir_path) {
	return GenerateConfiguration(
	android::linkerconfig::contents::CreateRecoveryConfiguration(ctx),
	dir_path,
	false);
	}

	Result<void> GenerateLegacyLinkerConfiguration(Context& ctx,
	const std::string& dir_path) {
	return GenerateConfiguration(
	android::linkerconfig::contents::CreateLegacyConfiguration(ctx),
	dir_path,
	false);
	}

	Result<void> GenerateApexConfiguration(
	const std::string& base_dir, android::linkerconfig::contents::Context& ctx,
	const android::linkerconfig::modules::ApexInfo& target_apex) {
	std::string dir_path = base_dir + "/" + target_apex.name;
	if (auto ret = mkdir(dir_path.c_str(), 0755); ret != 0 && errno != EEXIST) {
	return ErrnoError() << "Failed to create directory " << dir_path;
	}

	return GenerateConfiguration(
	android::linkerconfig::contents::CreateApexConfiguration(ctx, target_apex),
	dir_path,
	true);
	}

	void GenerateApexConfigurations(Context& ctx, const std::string& dir_path) {
	for (auto const& apex_item : ctx.GetApexModules()) {
	if (apex_item.has_bin) {
	auto result = GenerateApexConfiguration(dir_path, ctx, apex_item);
	if (!result.ok()) {
	LOG(WARNING) << result.error();
	}
	}
	}
	}

	void ExitOnFailure(Result<void> task) {
	if (!task.ok()) {
	LOG(FATAL) << task.error();
	exit(EXIT_FAILURE);
	}
	}

	#ifdef __ANDROID__
	struct CombinedLogger {
	android::base::LogdLogger logd;

	void operator()(android::base::LogId id, android::base::LogSeverity severity,
	const char* tag, const char* file, unsigned int line,
	const char* message) {
	logd(id, severity, tag, file, line, message);
	KernelLogger(id, severity, tag, file, line, message);
	}
	};
	#endif
	} // namespace

	int main(int argc, char* argv[]) {
	android::base::InitLogging(argv
	#ifdef __ANDROID__
	,
	CombinedLogger()
	#endif
	);

	ProgramArgs args = {};

	if (!ParseArgs(argc, argv, &args)) {
	PrintUsage(EXIT_FAILURE);
	}

	LoadVariables(args);
	Context ctx = GetContext(args);

	// when exec'ed from init, this is 0x0077, which makes the subdirectories
	// inaccessible for others. set umask to 0x0022 so that they can be
	// accessible.
	umask(0x0022);

	if (args.is_recovery) {
	ExitOnFailure(
	GenerateRecoveryLinkerConfiguration(ctx, args.target_directory));
	} else if (args.is_legacy) {
	ExitOnFailure(GenerateLegacyLinkerConfiguration(ctx, args.target_directory));
	} else {
	ExitOnFailure(GenerateBaseLinkerConfiguration(ctx, args.target_directory));
	GenerateApexConfigurations(ctx, args.target_directory);
	}

	return EXIT_SUCCESS;
	}