1 // Copyright 2022 Google LLC
2 //
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 #include <sdeventplus/event.hpp>
16 #include <sdeventplus/source/io.hpp>
17 #include <stdplus/fd/create.hpp>
18 #include <stdplus/fd/ops.hpp>
19 #include <stdplus/print.hpp>
20 
21 using namespace std::string_view_literals;
22 
23 // A privileged port that is reserved for querying BMC DHCP completion.
24 // This is well known by the clients querying the status.
25 constexpr uint16_t kListenPort = 23;
26 enum : uint8_t
27 {
28     DONE = 0,
29     POWERCYCLE = 1,
30 };
31 
32 stdplus::ManagedFd createListener()
33 {
34     using namespace stdplus::fd;
35     auto sock = socket(SocketDomain::INet6, SocketType::Stream,
36                        SocketProto::TCP);
37     setFileFlags(sock, getFileFlags(sock).set(stdplus::fd::FileFlag::NonBlock));
38     sockaddr_in6 addr = {};
39     addr.sin6_family = AF_INET6;
40     addr.sin6_port = htons(kListenPort);
41     bind(sock, addr);
42     listen(sock, 10);
43     return sock;
44 }
45 
46 int main(int argc, char* argv[])
47 {
48     if (argc != 2)
49     {
50         stdplus::println(stderr, "Invalid parameter count");
51         return 1;
52     }
53 
54     std::vector<uint8_t> data;
55 
56     if (argv[1] == "POWERCYCLE"sv)
57     {
58         data.push_back(POWERCYCLE);
59     }
60     else if (argv[1] == "DONE"sv)
61     {
62         data.push_back(DONE);
63     }
64     else
65     {
66         stdplus::println(stderr, "Invalid parameter");
67         return 1;
68     }
69 
70     try
71     {
72         auto listener = createListener();
73         auto event = sdeventplus::Event::get_default();
74         sdeventplus::source::IO do_accept(
75             event, listener.get(), EPOLLIN | EPOLLET,
76             [&](sdeventplus::source::IO&, int, uint32_t) {
77             while (auto fd = stdplus::fd::accept(listener))
78             {
79                 stdplus::fd::sendExact(*fd, data, stdplus::fd::SendFlags(0));
80             }
81         });
82         return event.loop();
83     }
84     catch (const std::exception& e)
85     {
86         stdplus::println(stderr, "Failed: {}", e.what());
87         return 1;
88     }
89 }
90