1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "host/libs/allocd/utils.h"
18
19 #include <cstdint>
20 #include <optional>
21
22 #include "common/libs/fs/shared_buf.h"
23 #include "common/libs/fs/shared_fd.h"
24 #include "host/libs/allocd/request.h"
25
26 namespace cuttlefish {
27
28 // While the JSON schema and payload structure are designed to be extensible,
29 // and avoid version incompatibility. However, should project requirements
30 // change, it is necessary that we have a mechanism to handle incompatibilities
31 // that arise over time. If an incompatibility should come about, the
32 // kMinHeaderVersion constant should be increased to match the new minimal set
33 // of features that are supported.
34
35 /// Current supported Header version number
36 constexpr uint16_t kCurHeaderVersion = 1;
37
38 /// Oldest compatible header version number
39 constexpr uint16_t kMinHeaderVersion = 1;
40
41 const std::map<RequestType, const char*> RequestTyToStrMap = {
42 {RequestType::ID, "alloc_id"},
43 {RequestType::CreateInterface, "create_interface"},
44 {RequestType::DestroyInterface, "destroy_interface"},
45 {RequestType::StopSession, "stop_session"},
46 {RequestType::Shutdown, "shutdown"},
47 {RequestType::Invalid, "invalid"}};
48
49 const std::map<std::string, RequestType> StrToRequestTyMap = {
50 {"alloc_id", RequestType::ID},
51 {"create_interface", RequestType::CreateInterface},
52 {"destroy_interface", RequestType::DestroyInterface},
53 {"stop_session", RequestType::StopSession},
54 {"shutdown", RequestType::Shutdown},
55 {"invalid", RequestType::Invalid}};
56
57 const std::map<std::string, IfaceType> StrToIfaceTyMap = {
58 {"invalid", IfaceType::Invalid},
59 {"mtap", IfaceType::mtap},
60 {"wtap", IfaceType::wtap},
61 {"etap", IfaceType::etap},
62 {"wbr", IfaceType::wbr},
63 {"ebr", IfaceType::ebr}};
64
65 const std::map<IfaceType, std::string> IfaceTyToStrMap = {
66 {IfaceType::Invalid, "invalid"},
67 {IfaceType::mtap, "mtap"},
68 {IfaceType::wtap, "wtap"},
69 {IfaceType::etap, "etap"},
70 {IfaceType::wbr, "wbr"},
71 {IfaceType::ebr, "ebr"}};
72
73 const std::map<RequestStatus, std::string> ReqStatusToStrMap = {
74 {RequestStatus::Invalid, "invalid"},
75 {RequestStatus::Pending, "pending"},
76 {RequestStatus::Failure, "failure"},
77 {RequestStatus::Success, "success"}};
78
79 const std::map<std::string, RequestStatus> StrToReqStatusMap = {
80 {"invalid", RequestStatus::Invalid},
81 {"pending", RequestStatus::Pending},
82 {"failure", RequestStatus::Failure},
83 {"success", RequestStatus::Success}};
84
SendJsonMsg(SharedFD client_socket,const Json::Value & resp)85 bool SendJsonMsg(SharedFD client_socket, const Json::Value& resp) {
86 LOG(INFO) << "Sending JSON message";
87 Json::StreamWriterBuilder factory;
88 auto resp_str = Json::writeString(factory, resp);
89
90 std::string header_buff(sizeof(RequestHeader), 0);
91
92 // fill in header
93 RequestHeader* header = reinterpret_cast<RequestHeader*>(header_buff.data());
94 header->len = resp_str.size();
95 header->version = kCurHeaderVersion;
96
97 auto payload = header_buff + resp_str;
98
99 return SendAll(client_socket, payload);
100 }
101
RecvJsonMsg(SharedFD client_socket)102 std::optional<Json::Value> RecvJsonMsg(SharedFD client_socket) {
103 LOG(INFO) << "Receiving JSON message";
104 RequestHeader header;
105 client_socket->Recv(&header, sizeof(header), kRecvFlags);
106
107 if (header.version < kMinHeaderVersion) {
108 LOG(WARNING) << "bad request header version: " << header.version;
109 return std::nullopt;
110 }
111
112 std::string payload = RecvAll(client_socket, header.len);
113
114 JsonRequestReader reader;
115 return reader.parse(payload);
116 }
117
ReqTyToStr(RequestType req_ty)118 std::string ReqTyToStr(RequestType req_ty) {
119 switch (req_ty) {
120 case RequestType::Invalid:
121 return "invalid";
122 case RequestType::Shutdown:
123 return "shutdown";
124 case RequestType::StopSession:
125 return "stop_session";
126 case RequestType::DestroyInterface:
127 return "destroy_interface";
128 case RequestType::CreateInterface:
129 return "create_interface";
130 case RequestType::ID:
131 return "id";
132 }
133 }
134
StrToReqTy(const std::string & req)135 RequestType StrToReqTy(const std::string& req) {
136 auto it = StrToRequestTyMap.find(req);
137 if (it == StrToRequestTyMap.end()) {
138 return RequestType::Invalid;
139 } else {
140 return it->second;
141 }
142 }
143
StrToStatus(const std::string & st)144 RequestStatus StrToStatus(const std::string& st) {
145 auto it = StrToReqStatusMap.find(st);
146 if (it == StrToReqStatusMap.end()) {
147 return RequestStatus::Invalid;
148 } else {
149 return it->second;
150 }
151 }
152
StatusToStr(RequestStatus st)153 std::string StatusToStr(RequestStatus st) {
154 switch (st) {
155 case RequestStatus::Invalid:
156 return "invalid";
157 case RequestStatus::Pending:
158 return "pending";
159 case RequestStatus::Success:
160 return "success";
161 case RequestStatus::Failure:
162 return "failure";
163 }
164 }
165
IfaceTyToStr(IfaceType iface)166 std::string IfaceTyToStr(IfaceType iface) {
167 switch (iface) {
168 case IfaceType::Invalid:
169 return "invalid";
170 case IfaceType::mtap:
171 return "mtap";
172 case IfaceType::wtap:
173 return "wtap";
174 case IfaceType::etap:
175 return "etap";
176 case IfaceType::wbr:
177 return "wbr";
178 case IfaceType::ebr:
179 return "ebr";
180 }
181 }
182
StrToIfaceTy(const std::string & iface)183 IfaceType StrToIfaceTy(const std::string& iface) {
184 auto it = StrToIfaceTyMap.find(iface);
185 if (it == StrToIfaceTyMap.end()) {
186 return IfaceType::Invalid;
187 } else {
188 return it->second;
189 }
190 }
191
192 } // namespace cuttlefish
193