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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/IPv4Address.h>
#include <AK/Types.h>
#include <LibCore/Notifier.h>
#include <LibCore/UDPServer.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#ifndef SOCK_NONBLOCK
# include <fcntl.h>
# include <sys/ioctl.h>
#endif
namespace Core {
UDPServer::UDPServer(Object* parent)
: Object(parent)
{
#ifdef SOCK_NONBLOCK
m_fd = socket(AF_INET, SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
#else
m_fd = socket(AF_INET, SOCK_DGRAM, 0);
int option = 1;
ioctl(m_fd, FIONBIO, &option);
fcntl(m_fd, F_SETFD, FD_CLOEXEC);
#endif
VERIFY(m_fd >= 0);
}
UDPServer::~UDPServer()
{
::close(m_fd);
}
bool UDPServer::bind(IPv4Address const& address, u16 port)
{
if (m_bound)
return false;
auto saddr = SocketAddress(address, port);
auto in = saddr.to_sockaddr_in();
if (::bind(m_fd, (sockaddr const*)&in, sizeof(in)) != 0) {
perror("UDPServer::bind");
return false;
}
m_bound = true;
m_notifier = Notifier::construct(m_fd, Notifier::Event::Read, this);
m_notifier->on_ready_to_read = [this] {
if (on_ready_to_receive)
on_ready_to_receive();
};
return true;
}
ByteBuffer UDPServer::receive(size_t size, sockaddr_in& in)
{
// FIXME: Handle possible OOM situation.
auto buf = ByteBuffer::create_uninitialized(size).release_value_but_fixme_should_propagate_errors();
socklen_t in_len = sizeof(in);
ssize_t rlen = ::recvfrom(m_fd, buf.data(), size, 0, (sockaddr*)&in, &in_len);
if (rlen < 0) {
dbgln("recvfrom: {}", strerror(errno));
return {};
}
buf.resize(rlen);
return buf;
}
Optional<IPv4Address> UDPServer::local_address() const
{
if (m_fd == -1)
return {};
sockaddr_in address;
socklen_t len = sizeof(address);
if (getsockname(m_fd, (sockaddr*)&address, &len) != 0)
return {};
return IPv4Address(address.sin_addr.s_addr);
}
Optional<u16> UDPServer::local_port() const
{
if (m_fd == -1)
return {};
sockaddr_in address;
socklen_t len = sizeof(address);
if (getsockname(m_fd, (sockaddr*)&address, &len) != 0)
return {};
return ntohs(address.sin_port);
}
ErrorOr<size_t> UDPServer::send(ReadonlyBytes buffer, sockaddr_in const& to)
{
if (m_fd < 0) {
return Error::from_errno(EBADF);
}
auto result = ::sendto(m_fd, buffer.data(), buffer.size(), 0, (sockaddr const*)&to, sizeof(to));
if (result < 0) {
return Error::from_errno(errno);
}
return result;
}
}
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