304793a811
stdout and stderr are macros in musl, which causes build failures when they are used as field names. Rename the fields to stdout_str and stderr_str. Test: builds Merged-In: I04770d2d6e82ca8393308ab12a304838a80f0ae5 Change-Id: I04770d2d6e82ca8393308ab12a304838a80f0ae5
129 lines
3.0 KiB
C++
129 lines
3.0 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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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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*/
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#ifdef _WIN32
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// nothing to see here
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#else
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#include <memory>
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#include <string>
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#include <vector>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "android-base/logging.h"
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#include "androidfw/PosixUtils.h"
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namespace {
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std::unique_ptr<std::string> ReadFile(int fd) {
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std::unique_ptr<std::string> str(new std::string());
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char buf[1024];
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ssize_t r;
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while ((r = read(fd, buf, sizeof(buf))) > 0) {
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str->append(buf, r);
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}
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if (r != 0) {
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return nullptr;
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}
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return str;
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}
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}
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namespace android {
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namespace util {
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std::unique_ptr<ProcResult> ExecuteBinary(const std::vector<std::string>& argv) {
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int stdout[2]; // stdout[0] read, stdout[1] write
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if (pipe(stdout) != 0) {
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PLOG(ERROR) << "pipe";
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return nullptr;
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}
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int stderr[2]; // stdout[0] read, stdout[1] write
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if (pipe(stderr) != 0) {
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PLOG(ERROR) << "pipe";
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close(stdout[0]);
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close(stdout[1]);
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return nullptr;
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}
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auto gid = getgid();
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auto uid = getuid();
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char const** argv0 = (char const**)malloc(sizeof(char*) * (argv.size() + 1));
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for (size_t i = 0; i < argv.size(); i++) {
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argv0[i] = argv[i].c_str();
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}
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argv0[argv.size()] = nullptr;
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int pid = fork();
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switch (pid) {
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case -1: // error
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free(argv0);
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PLOG(ERROR) << "fork";
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return nullptr;
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case 0: // child
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if (setgid(gid) != 0) {
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PLOG(ERROR) << "setgid";
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exit(1);
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}
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if (setuid(uid) != 0) {
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PLOG(ERROR) << "setuid";
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exit(1);
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}
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close(stdout[0]);
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if (dup2(stdout[1], STDOUT_FILENO) == -1) {
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abort();
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}
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close(stderr[0]);
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if (dup2(stderr[1], STDERR_FILENO) == -1) {
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abort();
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}
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execvp(argv0[0], const_cast<char* const*>(argv0));
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PLOG(ERROR) << "execv";
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abort();
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default: // parent
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free(argv0);
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close(stdout[1]);
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close(stderr[1]);
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int status;
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waitpid(pid, &status, 0);
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if (!WIFEXITED(status)) {
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close(stdout[0]);
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close(stderr[0]);
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return nullptr;
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}
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std::unique_ptr<ProcResult> result(new ProcResult());
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result->status = status;
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const auto out = ReadFile(stdout[0]);
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result->stdout_str = out ? *out : "";
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close(stdout[0]);
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const auto err = ReadFile(stderr[0]);
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result->stderr_str = err ? *err : "";
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close(stderr[0]);
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return result;
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}
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}
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} // namespace util
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} // namespace android
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#endif
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