62767fe29f
Solve one more issue where privilege is required to open a file and we do not want to grant such to the service. This is the service side of the picture, android_get_control_file() in libcutils is the client. The file's descriptor is placed into the environment as "ANDROID_FILE_<path>". For socket and files where non-alpha and non-numeric characters in the <name/path> are replaced with _. There was an accompanying change in android_get_control_socket() to match in commit 'libcutils: add android_get_control_socket() test' Add a gTest unit test for this that tests create_file and android_get_control_file(). Test: gTest init_tests --gtest_filter=util.create_file Bug: 32450474 Change-Id: I96eb970c707db6d51a9885873329ba1cb1f23140
104 lines
3.4 KiB
C++
104 lines
3.4 KiB
C++
/*
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* Copyright (C) 2016 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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#include "descriptors.h"
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#include <ctype.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <android-base/stringprintf.h>
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#include <cutils/files.h>
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#include <cutils/sockets.h>
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#include "init.h"
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#include "log.h"
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#include "util.h"
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DescriptorInfo::DescriptorInfo(const std::string& name, const std::string& type, uid_t uid,
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gid_t gid, int perm, const std::string& context)
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: name_(name), type_(type), uid_(uid), gid_(gid), perm_(perm), context_(context) {
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}
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DescriptorInfo::~DescriptorInfo() {
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}
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std::ostream& operator<<(std::ostream& os, const DescriptorInfo& info) {
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return os << " descriptors " << info.name_ << " " << info.type_ << " " << std::oct << info.perm_;
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}
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bool DescriptorInfo::operator==(const DescriptorInfo& other) const {
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return name_ == other.name_ && type_ == other.type_ && key() == other.key();
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}
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void DescriptorInfo::CreateAndPublish(const std::string& globalContext) const {
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// Create
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const std::string& contextStr = context_.empty() ? globalContext : context_;
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int fd = Create(contextStr);
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if (fd < 0) return;
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// Publish
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std::string publishedName = key() + name_;
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std::for_each(publishedName.begin(), publishedName.end(),
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[] (char& c) { c = isalnum(c) ? c : '_'; });
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std::string val = android::base::StringPrintf("%d", fd);
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add_environment(publishedName.c_str(), val.c_str());
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// make sure we don't close on exec
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fcntl(fd, F_SETFD, 0);
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}
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void DescriptorInfo::Clean() const {
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}
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SocketInfo::SocketInfo(const std::string& name, const std::string& type, uid_t uid,
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gid_t gid, int perm, const std::string& context)
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: DescriptorInfo(name, type, uid, gid, perm, context) {
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}
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void SocketInfo::Clean() const {
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unlink(android::base::StringPrintf(ANDROID_SOCKET_DIR "/%s", name().c_str()).c_str());
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}
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int SocketInfo::Create(const std::string& context) const {
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int flags = ((type() == "stream" ? SOCK_STREAM :
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(type() == "dgram" ? SOCK_DGRAM :
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SOCK_SEQPACKET)));
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return create_socket(name().c_str(), flags, perm(), uid(), gid(), context.c_str());
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}
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const std::string SocketInfo::key() const {
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return ANDROID_SOCKET_ENV_PREFIX;
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}
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FileInfo::FileInfo(const std::string& name, const std::string& type, uid_t uid,
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gid_t gid, int perm, const std::string& context)
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: DescriptorInfo(name, type, uid, gid, perm, context) {
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}
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int FileInfo::Create(const std::string& context) const {
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int flags = ((type() == "r" ? O_RDONLY :
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(type() == "w" ? (O_WRONLY | O_CREAT) :
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(O_RDWR | O_CREAT))));
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return create_file(name().c_str(), flags, perm(), uid(), gid(), context.c_str());
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}
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const std::string FileInfo::key() const {
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return ANDROID_FILE_ENV_PREFIX;
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}
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