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EchoServer: Add a simple echo server

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Brendan Coles 2020-12-16 02:42:01 +00:00 • committed by Andreas Kling
parent a46e48089d
commit 3c9a3a9405
Notes: sideshowbarker 2024-07-19 00:47:43 +09:00
6 changed files with 237 additions and 0 deletions
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23
Base/usr/share/man/man1/EchoServer.md Normal file
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## Name
EchoServer - Serenity echo server
## Synopsis
```**sh
$ EchoServer [options]
```
## Description
EchoServer is a basic echo server for Serenity. By default, it runs on port 7.
## Options
* `-p`: Choose different port for EchoServer to attach to.
## Examples
```sh
$ EchoServer -p 1234
```

1
Services/CMakeLists.txt
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@ -2,6 +2,7 @@ add_subdirectory(AudioServer)
add_subdirectory(ChessEngine)
add_subdirectory(Clipboard)
add_subdirectory(DHCPClient)
add_subdirectory(EchoServer)
add_subdirectory(ImageDecoder)
add_subdirectory(LaunchServer)
add_subdirectory(LookupServer)

7
Services/EchoServer/CMakeLists.txt Normal file
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set(SOURCES
Client.cpp
main.cpp
)
serenity_bin(EchoServer)
target_link_libraries(EchoServer LibCore)

58
Services/EchoServer/Client.cpp Normal file
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/*
* Copyright (c) 2020, the SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Client.h"
Client::Client(int id, RefPtr<Core::TCPSocket> socket)
: m_id(id)
, m_socket(move(socket))
{
m_socket->on_ready_to_read = [this] { drain_socket(); };
}
void Client::drain_socket()
{
NonnullRefPtr<Client> protect(*this);
while (m_socket->can_read()) {
auto buf = m_socket->read(1024);
dbg() << "Read " << buf.size() << " bytes: " << buf;
if (m_socket->eof()) {
quit();
break;
}
m_socket->write(buf);
}
}
void Client::quit()
{
m_socket->close();
if (on_exit)
on_exit();
}

49
Services/EchoServer/Client.h Normal file
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/*
* Copyright (c) 2020, the SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <LibCore/TCPSocket.h>
class Client : public RefCounted<Client> {
public:
static NonnullRefPtr<Client> create(int id, RefPtr<Core::TCPSocket> socket)
{
return adopt(*new Client(id, move(socket)));
}
Function<void()> on_exit;
protected:
Client(int id, RefPtr<Core::TCPSocket> socket);
void drain_socket();
void quit();
private:
int m_id { 0 };
RefPtr<Core::TCPSocket> m_socket;
};

99
Services/EchoServer/main.cpp Normal file
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/*
* Copyright (c) 2020, the SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Client.h"
#include <AK/HashMap.h>
#include <AK/IPv4Address.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/EventLoop.h>
#include <LibCore/TCPServer.h>
#include <LibCore/TCPSocket.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char** argv)
{
if (pledge("stdio cpath unix fattr inet id accept", nullptr) < 0) {
perror("pledge");
return 1;
}
if (unveil("/tmp/rpc", "rwc") < 0) {
perror("unveil");
return 1;
}
if (unveil(nullptr, nullptr) < 0) {
perror("unveil");
return 1;
}
int port = 7;
Core::ArgsParser args_parser;
args_parser.add_option(port, "Port to listen on", "port", 'p', "port");
args_parser.parse(argc, argv);
if ((u16)port != port) {
warnln("Invalid port number: {}", port);
exit(1);
}
Core::EventLoop event_loop;
auto server = Core::TCPServer::construct();
if (!server->listen({}, port)) {
warnln("Listening on 0.0.0.0:{} failed", port);
exit(1);
}
HashMap<int, NonnullRefPtr<Client>> clients;
int next_id = 0;
server->on_ready_to_accept = [&next_id, &clients, &server] {
int id = next_id++;
auto client_socket = server->accept();
if (!client_socket) {
perror("accept");
return;
}
outln("Client {} connected", id);
auto client = Client::create(id, move(client_socket));
client->on_exit = [&clients, id] {
clients.remove(id);
outln("Client {} disconnected", id);
};
clients.set(id, client);
};
outln("Listening on 0.0.0.0:{}", port);
return event_loop.exec();
}