mirror of
https://github.com/SerenityOS/serenity
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42435ce5e4
Instead of temporary changing the open file description's "blocking" flag while doing a non-waiting recvfrom, we instead plumb the currently wanted blocking behavior all the way through to the underlying socket.
302 lines
9.8 KiB
C++
302 lines
9.8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringView.h>
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#include <Kernel/API/POSIX/errno.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Net/IPv4Socket.h>
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#include <Kernel/Net/LocalSocket.h>
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#include <Kernel/Net/NetworkingManagement.h>
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#include <Kernel/Net/Socket.h>
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#include <Kernel/Process.h>
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#include <Kernel/UnixTypes.h>
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namespace Kernel {
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ErrorOr<NonnullLockRefPtr<Socket>> Socket::create(int domain, int type, int protocol)
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{
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switch (domain) {
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case AF_LOCAL:
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return TRY(LocalSocket::try_create(type & SOCK_TYPE_MASK));
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case AF_INET:
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return IPv4Socket::create(type & SOCK_TYPE_MASK, protocol);
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default:
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return EAFNOSUPPORT;
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}
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}
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Socket::Socket(int domain, int type, int protocol)
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: m_domain(domain)
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, m_type(type)
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, m_protocol(protocol)
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{
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set_origin(Process::current());
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}
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Socket::~Socket() = default;
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void Socket::set_setup_state(SetupState new_setup_state)
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{
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dbgln_if(SOCKET_DEBUG, "Socket({}) setup state moving from {} to {}", this, to_string(m_setup_state), to_string(new_setup_state));
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m_setup_state = new_setup_state;
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evaluate_block_conditions();
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}
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LockRefPtr<Socket> Socket::accept()
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{
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MutexLocker locker(mutex());
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if (m_pending.is_empty())
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return nullptr;
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dbgln_if(SOCKET_DEBUG, "Socket({}) de-queueing connection", this);
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auto client = m_pending.take_first();
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VERIFY(!client->is_connected());
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auto& process = Process::current();
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client->set_acceptor(process);
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client->m_connected = true;
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client->set_role(Role::Accepted);
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if (!m_pending.is_empty())
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evaluate_block_conditions();
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return client;
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}
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ErrorOr<void> Socket::queue_connection_from(NonnullLockRefPtr<Socket> peer)
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{
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dbgln_if(SOCKET_DEBUG, "Socket({}) queueing connection", this);
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MutexLocker locker(mutex());
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if (m_pending.size() >= m_backlog)
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return set_so_error(ECONNREFUSED);
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SOCKET_TRY(m_pending.try_append(move(peer)));
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evaluate_block_conditions();
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return {};
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}
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ErrorOr<void> Socket::setsockopt(int level, int option, Userspace<void const*> user_value, socklen_t user_value_size)
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{
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MutexLocker locker(mutex());
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if (level != SOL_SOCKET)
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return ENOPROTOOPT;
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VERIFY(level == SOL_SOCKET);
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switch (option) {
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case SO_SNDTIMEO:
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if (user_value_size != sizeof(timeval))
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return EINVAL;
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m_send_timeout = TRY(copy_time_from_user(static_ptr_cast<timeval const*>(user_value)));
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return {};
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case SO_RCVTIMEO:
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if (user_value_size != sizeof(timeval))
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return EINVAL;
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m_receive_timeout = TRY(copy_time_from_user(static_ptr_cast<timeval const*>(user_value)));
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return {};
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case SO_BINDTODEVICE: {
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if (user_value_size != IFNAMSIZ)
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return EINVAL;
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auto user_string = static_ptr_cast<char const*>(user_value);
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auto ifname = TRY(try_copy_kstring_from_user(user_string, user_value_size));
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auto device = NetworkingManagement::the().lookup_by_name(ifname->view());
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if (!device)
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return ENODEV;
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m_bound_interface = move(device);
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return {};
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}
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case SO_DEBUG:
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// NOTE: This is supposed to toggle collection of debugging information on/off, we don't have any right now, so this is a no-op.
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return {};
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case SO_KEEPALIVE:
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// FIXME: Obviously, this is not a real keepalive.
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return {};
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case SO_TIMESTAMP:
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if (user_value_size != sizeof(int))
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return EINVAL;
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m_timestamp = TRY(copy_typed_from_user(static_ptr_cast<int const*>(user_value)));
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if (m_timestamp != 0 && (domain() != AF_INET || type() == SOCK_STREAM)) {
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// FIXME: Support SO_TIMESTAMP for more protocols?
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m_timestamp = 0;
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return ENOTSUP;
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}
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return {};
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case SO_DONTROUTE: {
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if (user_value_size != sizeof(int))
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return EINVAL;
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m_routing_disabled = TRY(copy_typed_from_user(static_ptr_cast<int const*>(user_value))) != 0;
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return {};
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}
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case SO_REUSEADDR:
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dbgln("FIXME: SO_REUSEADDR requested, but not implemented.");
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return {};
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default:
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dbgln("setsockopt({}) at SOL_SOCKET not implemented.", option);
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return ENOPROTOOPT;
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}
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}
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ErrorOr<void> Socket::getsockopt(OpenFileDescription&, int level, int option, Userspace<void*> value, Userspace<socklen_t*> value_size)
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{
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MutexLocker locker(mutex());
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socklen_t size;
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TRY(copy_from_user(&size, value_size.unsafe_userspace_ptr()));
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// FIXME: Add TCP_NODELAY, IPPROTO_TCP and IPPROTO_IP (used in OpenSSH)
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if (level != SOL_SOCKET) {
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// Not sure if this is the correct error code, but it's only temporary until other levels are implemented.
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return ENOPROTOOPT;
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}
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switch (option) {
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case SO_SNDTIMEO:
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if (size < sizeof(timeval))
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return EINVAL;
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{
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timeval tv = m_send_timeout.to_timeval();
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TRY(copy_to_user(static_ptr_cast<timeval*>(value), &tv));
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}
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size = sizeof(timeval);
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return copy_to_user(value_size, &size);
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case SO_RCVTIMEO:
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if (size < sizeof(timeval))
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return EINVAL;
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{
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timeval tv = m_receive_timeout.to_timeval();
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TRY(copy_to_user(static_ptr_cast<timeval*>(value), &tv));
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}
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size = sizeof(timeval);
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return copy_to_user(value_size, &size);
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case SO_ERROR: {
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if (size < sizeof(int))
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return EINVAL;
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int errno;
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if (so_error().is_error())
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errno = so_error().error().code();
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else
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errno = 0;
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TRY(copy_to_user(static_ptr_cast<int*>(value), &errno));
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size = sizeof(int);
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TRY(copy_to_user(value_size, &size));
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clear_so_error();
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return {};
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}
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case SO_BINDTODEVICE:
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if (size < IFNAMSIZ)
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return EINVAL;
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if (m_bound_interface) {
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auto name = m_bound_interface->name();
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auto length = name.length() + 1;
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auto characters = name.characters_without_null_termination();
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TRY(copy_to_user(static_ptr_cast<char*>(value), characters, length));
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size = length;
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return copy_to_user(value_size, &size);
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} else {
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size = 0;
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TRY(copy_to_user(value_size, &size));
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// FIXME: This return value looks suspicious.
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return EFAULT;
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}
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case SO_TIMESTAMP:
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if (size < sizeof(int))
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return EINVAL;
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TRY(copy_to_user(static_ptr_cast<int*>(value), &m_timestamp));
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size = sizeof(int);
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return copy_to_user(value_size, &size);
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case SO_TYPE:
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if (size < sizeof(int))
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return EINVAL;
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TRY(copy_to_user(static_ptr_cast<int*>(value), &m_type));
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size = sizeof(int);
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return copy_to_user(value_size, &size);
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case SO_DEBUG:
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// NOTE: This is supposed to toggle collection of debugging information on/off, we don't have any right now, so we just claim it's always off.
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if (size < sizeof(int))
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return EINVAL;
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TRY(memset_user(value.unsafe_userspace_ptr(), 0, sizeof(int)));
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size = sizeof(int);
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return copy_to_user(value_size, &size);
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case SO_ACCEPTCONN: {
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int accepting_connections = (m_role == Role::Listener) ? 1 : 0;
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if (size < sizeof(accepting_connections))
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return EINVAL;
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TRY(copy_to_user(static_ptr_cast<int*>(value), &accepting_connections));
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size = sizeof(accepting_connections);
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return copy_to_user(value_size, &size);
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}
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case SO_DONTROUTE: {
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int routing_disabled = m_routing_disabled ? 1 : 0;
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if (size < sizeof(routing_disabled))
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return EINVAL;
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TRY(copy_to_user(static_ptr_cast<int*>(value), &routing_disabled));
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size = sizeof(routing_disabled);
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return copy_to_user(value_size, &size);
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}
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default:
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dbgln("getsockopt({}) at SOL_SOCKET not implemented.", option);
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return ENOPROTOOPT;
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}
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}
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ErrorOr<size_t> Socket::read(OpenFileDescription& description, u64, UserOrKernelBuffer& buffer, size_t size)
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{
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if (is_shut_down_for_reading())
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return 0;
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Time t {};
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return recvfrom(description, buffer, size, 0, {}, 0, t, description.is_blocking());
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}
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ErrorOr<size_t> Socket::write(OpenFileDescription& description, u64, UserOrKernelBuffer const& data, size_t size)
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{
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if (is_shut_down_for_writing())
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return set_so_error(EPIPE);
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return sendto(description, data, size, 0, {}, 0);
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}
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ErrorOr<void> Socket::shutdown(int how)
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{
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MutexLocker locker(mutex());
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if (type() == SOCK_STREAM && !is_connected())
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return set_so_error(ENOTCONN);
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if (m_role == Role::Listener)
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return set_so_error(ENOTCONN);
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if (!m_shut_down_for_writing && (how == SHUT_WR || how == SHUT_RDWR)) {
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shut_down_for_writing();
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m_shut_down_for_writing = true;
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}
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if (!m_shut_down_for_reading && (how == SHUT_RD || how == SHUT_RDWR)) {
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shut_down_for_reading();
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m_shut_down_for_reading = true;
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}
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return {};
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}
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ErrorOr<struct stat> Socket::stat() const
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{
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struct stat st = {};
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st.st_mode = S_IFSOCK;
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return st;
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}
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void Socket::set_connected(bool connected)
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{
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MutexLocker locker(mutex());
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if (m_connected == connected)
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return;
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m_connected = connected;
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evaluate_block_conditions();
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}
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void Socket::set_origin(Process const& process)
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{
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auto credentials = process.credentials();
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m_origin = { process.pid().value(), credentials->uid().value(), credentials->gid().value() };
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}
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void Socket::set_acceptor(Process const& process)
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{
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auto credentials = process.credentials();
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m_acceptor = { process.pid().value(), credentials->uid().value(), credentials->gid().value() };
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}
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}
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