1 /*
2  * Copyright 2020 Google Inc.
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 "machine_name.hpp"
18 
19 #include "errors.hpp"
20 
21 #include <cstddef>
22 #include <cstdio>
23 #include <cstring>
24 #include <optional>
25 #include <string>
26 
27 namespace google
28 {
29 namespace ipmi
30 {
31 
32 struct GetMachineNameRequest
33 {
34     uint8_t subcommand;
35 } __attribute__((packed));
36 
37 struct GetMachineNameReply
38 {
39     uint8_t subcommand;
40     uint8_t machineNameLength;
41 } __attribute__((packed));
42 
43 ipmi_ret_t getMachineName(const uint8_t* reqBuf, uint8_t* replyBuf,
44                           size_t* dataLen, HandlerInterface* handler)
45 {
46     GetMachineNameRequest request;
47     if (*dataLen < sizeof(request))
48     {
49         std::fprintf(stderr, "Invalid command length: %zu\n", *dataLen);
50         return IPMI_CC_REQ_DATA_LEN_INVALID;
51     }
52     std::memcpy(&request, reqBuf, sizeof(request));
53 
54     static std::optional<std::string> machineName;
55     if (!machineName)
56     {
57         try
58         {
59             machineName = handler->getMachineName();
60         }
61         catch (const IpmiException& e)
62         {
63             return e.getIpmiError();
64         }
65     }
66 
67     GetMachineNameReply reply;
68     size_t len = sizeof(reply) + machineName->size();
69     if (len > MAX_IPMI_BUFFER)
70     {
71         std::fprintf(stderr, "Response would overflow response buffer\n");
72         return IPMI_CC_INVALID;
73     }
74     reply.subcommand = request.subcommand;
75     reply.machineNameLength = machineName->size();
76     std::memcpy(replyBuf, &reply, sizeof(reply));
77     std::memcpy(replyBuf + sizeof(reply), machineName->data(),
78                 machineName->size());
79     (*dataLen) = len;
80     return IPMI_CC_OK;
81 }
82 
83 } // namespace ipmi
84 } // namespace google
85