mirror of
https://github.com/SerenityOS/serenity
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767529ebf5
This is a first step towards handling OOM errors instead of just crashing the program. Now UDPServer's method `receive()` return memory allocation errors explicitly with help of ErrorOr. This removes one FIXME and make a bunch of new ones. :(
116 lines
2.6 KiB
C++
116 lines
2.6 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Alexander Narsudinov <a.narsudinov@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/IPv4Address.h>
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#include <AK/Types.h>
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#include <LibCore/Notifier.h>
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#include <LibCore/System.h>
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#include <LibCore/UDPServer.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#ifndef SOCK_NONBLOCK
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# include <fcntl.h>
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# include <sys/ioctl.h>
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#endif
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namespace Core {
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UDPServer::UDPServer(Object* parent)
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: Object(parent)
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{
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#ifdef SOCK_NONBLOCK
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m_fd = socket(AF_INET, SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
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#else
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m_fd = socket(AF_INET, SOCK_DGRAM, 0);
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int option = 1;
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ioctl(m_fd, FIONBIO, &option);
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fcntl(m_fd, F_SETFD, FD_CLOEXEC);
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#endif
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VERIFY(m_fd >= 0);
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}
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UDPServer::~UDPServer()
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{
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::close(m_fd);
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}
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bool UDPServer::bind(IPv4Address const& address, u16 port)
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{
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if (m_bound)
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return false;
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auto saddr = SocketAddress(address, port);
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auto in = saddr.to_sockaddr_in();
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if (::bind(m_fd, (sockaddr const*)&in, sizeof(in)) != 0) {
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perror("UDPServer::bind");
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return false;
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}
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m_bound = true;
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m_notifier = Notifier::construct(m_fd, Notifier::Event::Read, this);
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m_notifier->on_ready_to_read = [this] {
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if (on_ready_to_receive)
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on_ready_to_receive();
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};
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return true;
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}
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ErrorOr<ByteBuffer> UDPServer::receive(size_t size, sockaddr_in& in)
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{
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auto buf = TRY(ByteBuffer::create_uninitialized(size));
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socklen_t in_len = sizeof(in);
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auto bytes_received = TRY(Core::System::recvfrom(m_fd, buf.data(), size, 0, (sockaddr*)&in, &in_len));
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buf.resize(bytes_received);
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return buf;
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}
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Optional<IPv4Address> UDPServer::local_address() const
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{
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if (m_fd == -1)
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return {};
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sockaddr_in address;
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socklen_t len = sizeof(address);
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if (getsockname(m_fd, (sockaddr*)&address, &len) != 0)
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return {};
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return IPv4Address(address.sin_addr.s_addr);
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}
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Optional<u16> UDPServer::local_port() const
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{
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if (m_fd == -1)
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return {};
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sockaddr_in address;
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socklen_t len = sizeof(address);
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if (getsockname(m_fd, (sockaddr*)&address, &len) != 0)
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return {};
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return ntohs(address.sin_port);
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}
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ErrorOr<size_t> UDPServer::send(ReadonlyBytes buffer, sockaddr_in const& to)
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{
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if (m_fd < 0) {
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return Error::from_errno(EBADF);
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}
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auto result = ::sendto(m_fd, buffer.data(), buffer.size(), 0, (sockaddr const*)&to, sizeof(to));
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if (result < 0) {
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return Error::from_errno(errno);
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}
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return result;
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}
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}
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