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Serenity Operating System
1/*
2 * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <AK/IPv4Address.h>
28#include <AK/Types.h>
29#include <LibCore/Notifier.h>
30#include <LibCore/UdpServer.h>
31#include <LibCore/UdpSocket.h>
32#include <stdio.h>
33#include <sys/socket.h>
34
35namespace Core {
36
37UdpServer::UdpServer(Object* parent)
38 : Object(parent)
39{
40 m_fd = socket(AF_INET, SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
41 ASSERT(m_fd >= 0);
42}
43
44UdpServer::~UdpServer()
45{
46}
47
48bool UdpServer::listen(const IPv4Address& address, u16 port)
49{
50 if (m_listening)
51 return false;
52
53 int rc;
54 auto socket_address = SocketAddress(address, port);
55 auto in = socket_address.to_sockaddr_in();
56 rc = ::bind(m_fd, (const sockaddr*)&in, sizeof(in));
57 ASSERT(rc == 0);
58
59 rc = ::listen(m_fd, 5);
60 ASSERT(rc == 0);
61 m_listening = true;
62
63 m_notifier = Notifier::construct(m_fd, Notifier::Event::Read, this);
64 m_notifier->on_ready_to_read = [this] {
65 if (on_ready_to_accept)
66 on_ready_to_accept();
67 };
68 return true;
69}
70
71RefPtr<UdpSocket> UdpServer::accept()
72{
73 ASSERT(m_listening);
74 sockaddr_in in;
75 socklen_t in_size = sizeof(in);
76 int accepted_fd = ::accept(m_fd, (sockaddr*)&in, &in_size);
77 if (accepted_fd < 0) {
78 perror("accept");
79 return nullptr;
80 }
81
82 return UdpSocket::construct(accepted_fd);
83}
84
85Optional<IPv4Address> UdpServer::local_address() const
86{
87 if (m_fd == -1)
88 return {};
89
90 sockaddr_in address;
91 socklen_t len = sizeof(address);
92 if (getsockname(m_fd, (sockaddr*)&address, &len) != 0)
93 return {};
94
95 return IPv4Address(address.sin_addr.s_addr);
96}
97
98Optional<u16> UdpServer::local_port() const
99{
100 if (m_fd == -1)
101 return {};
102
103 sockaddr_in address;
104 socklen_t len = sizeof(address);
105 if (getsockname(m_fd, (sockaddr*)&address, &len) != 0)
106 return {};
107
108 return ntohs(address.sin_port);
109}
110
111}