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#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Net/LocalSocket.h>
#include <Kernel/Process.h>
#include <Kernel/UnixTypes.h>
#include <LibC/errno_numbers.h>
//#define DEBUG_LOCAL_SOCKET
Retained<LocalSocket> LocalSocket::create(int type)
{
return adopt(*new LocalSocket(type));
}
LocalSocket::LocalSocket(int type)
: Socket(AF_LOCAL, type, 0)
{
#ifdef DEBUG_LOCAL_SOCKET
kprintf("%s(%u) LocalSocket{%p} created with type=%u\n", current->process().name().characters(), current->pid(), this, type);
#endif
}
LocalSocket::~LocalSocket()
{
}
bool LocalSocket::get_local_address(sockaddr* address, socklen_t* address_size)
{
// FIXME: Look into what fallback behavior we should have here.
if (*address_size != sizeof(sockaddr_un))
return false;
memcpy(address, &m_address, sizeof(sockaddr_un));
*address_size = sizeof(sockaddr_un);
return true;
}
bool LocalSocket::get_peer_address(sockaddr* address, socklen_t* address_size)
{
return get_local_address(address, address_size);
}
KResult LocalSocket::bind(const sockaddr* address, socklen_t address_size)
{
ASSERT(!is_connected());
if (address_size != sizeof(sockaddr_un))
return KResult(-EINVAL);
if (address->sa_family != AF_LOCAL)
return KResult(-EINVAL);
const sockaddr_un& local_address = *reinterpret_cast<const sockaddr_un*>(address);
char safe_address[sizeof(local_address.sun_path) + 1];
memcpy(safe_address, local_address.sun_path, sizeof(local_address.sun_path));
#ifdef DEBUG_LOCAL_SOCKET
kprintf("%s(%u) LocalSocket{%p} bind(%s)\n", current->process().name().characters(), current->pid(), this, safe_address);
#endif
auto result = VFS::the().open(safe_address, O_CREAT | O_EXCL, S_IFSOCK | 0666, current->process().current_directory());
if (result.is_error()) {
if (result.error() == -EEXIST)
return KResult(-EADDRINUSE);
return result.error();
}
m_file = move(result.value());
ASSERT(m_file->inode());
m_file->inode()->bind_socket(*this);
m_address = local_address;
m_bound = true;
return KSuccess;
}
KResult LocalSocket::connect(FileDescription& description, const sockaddr* address, socklen_t address_size, ShouldBlock)
{
ASSERT(!m_bound);
if (address_size != sizeof(sockaddr_un))
return KResult(-EINVAL);
if (address->sa_family != AF_LOCAL)
return KResult(-EINVAL);
const sockaddr_un& local_address = *reinterpret_cast<const sockaddr_un*>(address);
char safe_address[sizeof(local_address.sun_path) + 1];
memcpy(safe_address, local_address.sun_path, sizeof(local_address.sun_path));
#ifdef DEBUG_LOCAL_SOCKET
kprintf("%s(%u) LocalSocket{%p} connect(%s)\n", current->process().name().characters(), current->pid(), this, safe_address);
#endif
auto description_or_error = VFS::the().open(safe_address, 0, 0, current->process().current_directory());
if (description_or_error.is_error())
return KResult(-ECONNREFUSED);
m_file = move(description_or_error.value());
ASSERT(m_file->inode());
if (!m_file->inode()->socket())
return KResult(-ECONNREFUSED);
m_address = local_address;
auto peer = m_file->inode()->socket();
auto result = peer->queue_connection_from(*this);
if (result.is_error())
return result;
return current->wait_for_connect(description);
}
void LocalSocket::attach(FileDescription& description)
{
switch (description.socket_role()) {
case SocketRole::Accepted:
++m_accepted_fds_open;
break;
case SocketRole::Connected:
++m_connected_fds_open;
break;
case SocketRole::Connecting:
++m_connecting_fds_open;
break;
default:
break;
}
}
void LocalSocket::detach(FileDescription& description)
{
switch (description.socket_role()) {
case SocketRole::Accepted:
ASSERT(m_accepted_fds_open);
--m_accepted_fds_open;
break;
case SocketRole::Connected:
ASSERT(m_connected_fds_open);
--m_connected_fds_open;
break;
case SocketRole::Connecting:
ASSERT(m_connecting_fds_open);
--m_connecting_fds_open;
break;
default:
break;
}
}
bool LocalSocket::can_read(FileDescription& description) const
{
auto role = description.socket_role();
if (role == SocketRole::Listener)
return can_accept();
if (role == SocketRole::Accepted)
return !has_attached_peer(description) || !m_for_server.is_empty();
if (role == SocketRole::Connected)
return !has_attached_peer(description) || !m_for_client.is_empty();
ASSERT_NOT_REACHED();
}
ssize_t LocalSocket::read(FileDescription& description, byte* buffer, ssize_t size)
{
auto role = description.socket_role();
if (role == SocketRole::Accepted) {
if (!description.is_blocking()) {
if (m_for_server.is_empty())
return -EAGAIN;
}
return m_for_server.read(buffer, size);
}
if (role == SocketRole::Connected) {
if (!description.is_blocking()) {
if (m_for_client.is_empty())
return -EAGAIN;
}
return m_for_client.read(buffer, size);
}
ASSERT_NOT_REACHED();
}
bool LocalSocket::has_attached_peer(const FileDescription& description) const
{
if (description.socket_role() == SocketRole::Accepted)
return m_connected_fds_open || m_connecting_fds_open;
if (description.socket_role() == SocketRole::Connected)
return m_accepted_fds_open;
ASSERT_NOT_REACHED();
}
ssize_t LocalSocket::write(FileDescription& description, const byte* data, ssize_t size)
{
if (!has_attached_peer(description))
return -EPIPE;
if (description.socket_role() == SocketRole::Accepted)
return m_for_client.write(data, size);
if (description.socket_role() == SocketRole::Connected)
return m_for_server.write(data, size);
ASSERT_NOT_REACHED();
}
bool LocalSocket::can_write(FileDescription& description) const
{
if (description.socket_role() == SocketRole::Accepted)
return !has_attached_peer(description) || m_for_client.bytes_in_write_buffer() < 16384;
if (description.socket_role() == SocketRole::Connected)
return !has_attached_peer(description) || m_for_server.bytes_in_write_buffer() < 16384;
ASSERT_NOT_REACHED();
}
ssize_t LocalSocket::sendto(FileDescription& description, const void* data, size_t data_size, int, const sockaddr*, socklen_t)
{
return write(description, (const byte*)data, data_size);
}
ssize_t LocalSocket::recvfrom(FileDescription& description, void* buffer, size_t buffer_size, int, sockaddr*, socklen_t*)
{
return read(description, (byte*)buffer, buffer_size);
}
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