/*
* Copyright (C) 2015 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 "Utils.h"
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <fcntl.h>
#include <linux/fs.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/statvfs.h>
#include <selinux/android.h>
using android::base::ReadFileToString;
using android::base::StringPrintf;
namespace android {
namespace vold {
static const char* kKeyPath = "/data/misc/vold";
status_t ForkExecvp(const std::vector<std::string>& args) {
return ForkExecvp(args, nullptr);
}
status_t ForkExecvp(const std::vector<std::string>& args, security_context_t context) {
size_t argc = args.size();
char** argv = (char**) calloc(argc, sizeof(char*));
for (size_t i = 0; i < argc; i++) {
argv[i] = (char*) args[i].c_str();
if (i == 0) {
LOG(VERBOSE) << args[i];
} else {
LOG(VERBOSE) << " " << args[i];
}
}
if (setexeccon(context)) {
LOG(ERROR) << "Failed to setexeccon";
abort();
}
abort();
status_t res = 1;//android_fork_execvp(argc, argv, NULL, false, true);
if (setexeccon(nullptr)) {
LOG(ERROR) << "Failed to setexeccon";
abort();
}
free(argv);
return res;
}
status_t ForkExecvp(const std::vector<std::string>& args,
std::vector<std::string>& output) {
return ForkExecvp(args, output, nullptr);
}
status_t ForkExecvp(const std::vector<std::string>& args,
std::vector<std::string>& output, security_context_t context) {
std::string cmd;
for (size_t i = 0; i < args.size(); i++) {
cmd += args[i] + " ";
if (i == 0) {
LOG(VERBOSE) << args[i];
} else {
LOG(VERBOSE) << " " << args[i];
}
}
output.clear();
if (setexeccon(context)) {
LOG(ERROR) << "Failed to setexeccon";
abort();
}
FILE* fp = popen(cmd.c_str(), "r");
if (setexeccon(nullptr)) {
LOG(ERROR) << "Failed to setexeccon";
abort();
}
if (!fp) {
PLOG(ERROR) << "Failed to popen " << cmd;
return -errno;
}
char line[1024];
while (fgets(line, sizeof(line), fp) != nullptr) {
LOG(VERBOSE) << line;
output.push_back(std::string(line));
}
if (pclose(fp) != 0) {
PLOG(ERROR) << "Failed to pclose " << cmd;
return -errno;
}
return OK;
}
pid_t ForkExecvpAsync(const std::vector<std::string>& args) {
size_t argc = args.size();
char** argv = (char**) calloc(argc + 1, sizeof(char*));
for (size_t i = 0; i < argc; i++) {
argv[i] = (char*) args[i].c_str();
if (i == 0) {
LOG(VERBOSE) << args[i];
} else {
LOG(VERBOSE) << " " << args[i];
}
}
pid_t pid = fork();
if (pid == 0) {
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
if (execvp(argv[0], argv)) {
PLOG(ERROR) << "Failed to exec";
}
_exit(1);
}
if (pid == -1) {
PLOG(ERROR) << "Failed to exec";
}
free(argv);
return pid;
}
status_t ReadRandomBytes(size_t bytes, std::string& out) {
out.clear();
int fd = TEMP_FAILURE_RETRY(open("/dev/urandom", O_RDONLY | O_CLOEXEC | O_NOFOLLOW));
if (fd == -1) {
return -errno;
}
char buf[BUFSIZ];
size_t n;
while ((n = TEMP_FAILURE_RETRY(read(fd, &buf[0], std::min(sizeof(buf), bytes)))) > 0) {
out.append(buf, n);
bytes -= n;
}
close(fd);
if (bytes == 0) {
return OK;
} else {
return -EIO;
}
}
status_t HexToStr(const std::string& hex, std::string& str) {
str.clear();
bool even = true;
char cur = 0;
for (size_t i = 0; i < hex.size(); i++) {
int val = 0;
switch (hex[i]) {
case ' ': case '-': case ':': continue;
case 'f': case 'F': val = 15; break;
case 'e': case 'E': val = 14; break;
case 'd': case 'D': val = 13; break;
case 'c': case 'C': val = 12; break;
case 'b': case 'B': val = 11; break;
case 'a': case 'A': val = 10; break;
case '9': val = 9; break;
case '8': val = 8; break;
case '7': val = 7; break;
case '6': val = 6; break;
case '5': val = 5; break;
case '4': val = 4; break;
case '3': val = 3; break;
case '2': val = 2; break;
case '1': val = 1; break;
case '0': val = 0; break;
default: return -EINVAL;
}
if (even) {
cur = val << 4;
} else {
cur += val;
str.push_back(cur);
cur = 0;
}
even = !even;
}
return even ? OK : -EINVAL;
}
static bool isValidFilename(const std::string& name) {
if (name.empty() || (name == ".") || (name == "..")
|| (name.find('/') != std::string::npos)) {
return false;
} else {
return true;
}
}
std::string BuildKeyPath(const std::string& partGuid) {
return StringPrintf("%s/expand_%s.key", kKeyPath, partGuid.c_str());
}
std::string BuildDataSystemLegacyPath(userid_t userId) {
return StringPrintf("%s/system/users/%u", BuildDataPath(nullptr).c_str(), userId);
}
std::string BuildDataSystemCePath(userid_t userId) {
return StringPrintf("%s/system_ce/%u", BuildDataPath(nullptr).c_str(), userId);
}
std::string BuildDataSystemDePath(userid_t userId) {
return StringPrintf("%s/system_de/%u", BuildDataPath(nullptr).c_str(), userId);
}
std::string BuildDataMiscLegacyPath(userid_t userId) {
return StringPrintf("%s/misc/user/%u", BuildDataPath(nullptr).c_str(), userId);
}
std::string BuildDataMiscCePath(userid_t userId) {
return StringPrintf("%s/misc_ce/%u", BuildDataPath(nullptr).c_str(), userId);
}
std::string BuildDataMiscDePath(userid_t userId) {
return StringPrintf("%s/misc_de/%u", BuildDataPath(nullptr).c_str(), userId);
}
// Keep in sync with installd (frameworks/native/cmds/installd/utils.h)
std::string BuildDataProfilesDePath(userid_t userId) {
return StringPrintf("%s/misc/profiles/cur/%u", BuildDataPath(nullptr).c_str(), userId);
}
std::string BuildDataProfilesForeignDexDePath(userid_t userId) {
std::string profiles_path = BuildDataProfilesDePath(userId);
return StringPrintf("%s/foreign-dex", profiles_path.c_str());
}
std::string BuildDataPath(const char* volumeUuid) {
// TODO: unify with installd path generation logic
if (volumeUuid == nullptr) {
return "/data";
} else {
CHECK(isValidFilename(volumeUuid));
return StringPrintf("/mnt/expand/%s", volumeUuid);
}
}
std::string BuildDataMediaCePath(const char* volumeUuid, userid_t userId) {
// TODO: unify with installd path generation logic
std::string data(BuildDataPath(volumeUuid));
return StringPrintf("%s/media/%u", data.c_str(), userId);
}
std::string BuildDataUserCePath(const char* volumeUuid, userid_t userId) {
// TODO: unify with installd path generation logic
std::string data(BuildDataPath(volumeUuid));
if (volumeUuid == nullptr) {
if (userId == 0) {
return StringPrintf("%s/data", data.c_str());
} else {
return StringPrintf("%s/user/%u", data.c_str(), userId);
}
} else {
return StringPrintf("%s/user/%u", data.c_str(), userId);
}
}
std::string BuildDataUserDePath(const char* volumeUuid, userid_t userId) {
// TODO: unify with installd path generation logic
std::string data(BuildDataPath(volumeUuid));
return StringPrintf("%s/user_de/%u", data.c_str(), userId);
}
} // namespace vold
} // namespace android
