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
20 #include "logging.h"
21 #include "socket_context.h"
22
23 namespace {
24 const int BUF_MAX_LEN = 10;
25 const int MOVE_BIT = 32;
26 } // namespace
27
HookService(int smbFd,int eventFd,uint32_t filterSize,uint32_t smbSize,int pid,std::string processName)28 HookService::HookService(int smbFd,
29 int eventFd,
30 uint32_t filterSize,
31 uint32_t smbSize,
32 int pid,
33 std::string processName)
34 : smbFd_(smbFd), eventFd_(eventFd), filterSize_(filterSize), smbSize_(smbSize), pid_(pid), processName_(processName)
35 {
36 serviceName_ = "HookService";
37 StartService(DEFAULT_UNIX_SOCKET_HOOK_PATH);
38 }
39
~HookService()40 HookService::~HookService()
41 {
42 serviceEntry_ = nullptr;
43 }
44
StartService(const std::string & unixSocketName)45 bool HookService::StartService(const std::string& unixSocketName)
46 {
47 serviceEntry_ = std::make_shared<ServiceEntry>();
48 if (!serviceEntry_->StartServer(unixSocketName)) {
49 serviceEntry_ = nullptr;
50 HILOG_DEBUG(LOG_CORE, "Start IPC Service FAIL");
51 return false;
52 }
53 serviceEntry_->RegisterService(*this);
54 return true;
55 }
56
ProtocolProc(SocketContext & context,uint32_t pnum,const int8_t * buf,const uint32_t size)57 bool HookService::ProtocolProc(SocketContext &context, uint32_t pnum, const int8_t *buf, const uint32_t size)
58 {
59 if (size != sizeof(uint64_t)) {
60 HILOG_ERROR(LOG_CORE, "ProtocolProc hook config error");
61 }
62 uint64_t peerconfig = *const_cast<uint64_t *>(reinterpret_cast<const uint64_t *>(buf));
63 if (pid_ == -1) {
64 // check if the pid and process name is consistency
65 std::string findpid = "pidof " + processName_;
66 std::unique_ptr<char []> buffer {new (std::nothrow) char[BUF_MAX_LEN]};
67 HILOG_INFO(LOG_CORE, "find pid command : %s", findpid.c_str());
68 std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(findpid.c_str(), "r"), pclose);
69
70 char line[LINE_SIZE];
71 do {
72 if (fgets(line, sizeof(line), pipe.get()) == nullptr) {
73 return false;
74 } else if (strlen(line) > 0 && isdigit((unsigned char)(line[0]))) {
75 pid_ = (int)atoi(line);
76 if (peerconfig != (uint64_t)pid_) {
77 return false;
78 }
79 printf("Process %" PRIu64 " hook started.\n", peerconfig);
80 break;
81 }
82 } while (1);
83 } else if (peerconfig != (uint64_t)pid_) {
84 HILOG_ERROR(LOG_CORE, "ProtocolProc receive peerconfig %" PRIu64 " not expected", peerconfig);
85 return false;
86 }
87
88 HILOG_DEBUG(LOG_CORE, "ProtocolProc, receive message from hook client, and send hook config to process %d", pid_);
89 uint64_t config = filterSize_;
90 config <<= MOVE_BIT;
91 config |= smbSize_;
92 context.SendHookConfig(config);
93 context.SendFileDescriptor(smbFd_);
94 context.SendFileDescriptor(eventFd_);
95 return true;
96 }
97