1 /*
2 * Copyright (c) 2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "hook_service.h"
17
18 #include <cinttypes>
19 #include <unistd.h>
20
21 #include "logging.h"
22 #include "parameter.h"
23 #include "socket_context.h"
24
25 namespace {
26 const int BUF_MAX_LEN = 10;
27 } // namespace
28
HookService(int smbFd,int eventFd,int pid,std::string processName,uint64_t config)29 HookService::HookService(int smbFd,
30 int eventFd,
31 int pid,
32 std::string processName,
33 uint64_t config)
34 : smbFd_(smbFd), eventFd_(eventFd), hookConfig_(config), pid_(pid), processName_(processName)
35 {
36 serviceName_ = "HookService";
37 if (getuid() == 0) {
38 StartService(DEFAULT_UNIX_SOCKET_HOOK_FULL_PATH);
39 } else {
40 StartService(DEFAULT_UNIX_SOCKET_HOOK_PATH);
41 }
42 }
43
~HookService()44 HookService::~HookService()
45 {
46 serviceEntry_ = nullptr;
47 }
48
StartService(const std::string & unixSocketName)49 bool HookService::StartService(const std::string& unixSocketName)
50 {
51 serviceEntry_ = std::make_shared<ServiceEntry>();
52 if (!serviceEntry_->StartServer(unixSocketName)) {
53 serviceEntry_ = nullptr;
54 HILOG_DEBUG(LOG_CORE, "Start IPC Service FAIL");
55 return false;
56 }
57 serviceEntry_->RegisterService(*this);
58 return true;
59 }
60
ProtocolProc(SocketContext & context,uint32_t pnum,const int8_t * buf,const uint32_t size)61 bool HookService::ProtocolProc(SocketContext &context, uint32_t pnum, const int8_t *buf, const uint32_t size)
62 {
63 if (size != sizeof(uint64_t)) {
64 HILOG_ERROR(LOG_CORE, "ProtocolProc hook config error");
65 }
66 uint64_t peerConfig = *const_cast<uint64_t *>(reinterpret_cast<const uint64_t *>(buf));
67 if (peerConfig == -1u) {
68 return true;
69 }
70 if (pid_ == 0) {
71 printf("Process %" PRIu64 " hook started.\n", peerConfig);
72 pid_ = static_cast<int>(peerConfig);
73 } else if (peerConfig != (uint64_t)pid_) {
74 HILOG_ERROR(LOG_CORE, "ProtocolProc receive peerConfig:%" PRIu64 " not expected", peerConfig);
75 return false;
76 }
77 HILOG_DEBUG(LOG_CORE, "ProtocolProc, receive message from hook client, and send hook config to process %d", pid_);
78 context.SendHookConfig(hookConfig_);
79 context.SendFileDescriptor(smbFd_);
80 context.SendFileDescriptor(eventFd_);
81 return true;
82 }
83