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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/Net/IPv4Socket.h>
#include <Kernel/Net/LocalSocket.h>
#include <Kernel/Process.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
#define REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(domain) \
do { \
if (domain == AF_INET) \
REQUIRE_PROMISE(inet); \
else if (domain == AF_LOCAL) \
REQUIRE_PROMISE(unix); \
} while (0)
int Process::sys$socket(int domain, int type, int protocol)
{
REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(domain);
if ((type & SOCK_TYPE_MASK) == SOCK_RAW && !is_superuser())
return -EACCES;
int fd = alloc_fd();
if (fd < 0)
return fd;
auto result = Socket::create(domain, type, protocol);
if (result.is_error())
return result.error();
auto description_result = FileDescription::create(*result.value());
if (description_result.is_error())
return description_result.error();
description_result.value()->set_readable(true);
description_result.value()->set_writable(true);
unsigned flags = 0;
if (type & SOCK_CLOEXEC)
flags |= FD_CLOEXEC;
if (type & SOCK_NONBLOCK)
description_result.value()->set_blocking(false);
m_fds[fd].set(description_result.release_value(), flags);
return fd;
}
int Process::sys$bind(int sockfd, Userspace<const sockaddr*> address, socklen_t address_length)
{
auto description = file_description(sockfd);
if (!description)
return -EBADF;
if (!description->is_socket())
return -ENOTSOCK;
auto& socket = *description->socket();
REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
return socket.bind(address, address_length);
}
int Process::sys$listen(int sockfd, int backlog)
{
if (backlog < 0)
return -EINVAL;
auto description = file_description(sockfd);
if (!description)
return -EBADF;
if (!description->is_socket())
return -ENOTSOCK;
auto& socket = *description->socket();
REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
if (socket.is_connected())
return -EINVAL;
return socket.listen(backlog);
}
int Process::sys$accept(int accepting_socket_fd, Userspace<sockaddr*> user_address, Userspace<socklen_t*> user_address_size)
{
REQUIRE_PROMISE(accept);
socklen_t address_size = 0;
if (user_address && !copy_from_user(&address_size, static_ptr_cast<const socklen_t*>(user_address_size)))
return -EFAULT;
int accepted_socket_fd = alloc_fd();
if (accepted_socket_fd < 0)
return accepted_socket_fd;
auto accepting_socket_description = file_description(accepting_socket_fd);
if (!accepting_socket_description)
return -EBADF;
if (!accepting_socket_description->is_socket())
return -ENOTSOCK;
auto& socket = *accepting_socket_description->socket();
if (!socket.can_accept()) {
if (accepting_socket_description->is_blocking()) {
auto unblock_flags = Thread::FileBlocker::BlockFlags::None;
if (Thread::current()->block<Thread::AcceptBlocker>({}, *accepting_socket_description, unblock_flags).was_interrupted())
return -EINTR;
} else {
return -EAGAIN;
}
}
auto accepted_socket = socket.accept();
ASSERT(accepted_socket);
if (user_address) {
u8 address_buffer[sizeof(sockaddr_un)];
address_size = min(sizeof(sockaddr_un), static_cast<size_t>(address_size));
accepted_socket->get_peer_address((sockaddr*)address_buffer, &address_size);
if (!copy_to_user(user_address, address_buffer, address_size))
return -EFAULT;
if (!copy_to_user(user_address_size, &address_size))
return -EFAULT;
}
auto accepted_socket_description_result = FileDescription::create(*accepted_socket);
if (accepted_socket_description_result.is_error())
return accepted_socket_description_result.error();
accepted_socket_description_result.value()->set_readable(true);
accepted_socket_description_result.value()->set_writable(true);
// NOTE: The accepted socket inherits fd flags from the accepting socket.
// I'm not sure if this matches other systems but it makes sense to me.
accepted_socket_description_result.value()->set_blocking(accepting_socket_description->is_blocking());
m_fds[accepted_socket_fd].set(accepted_socket_description_result.release_value(), m_fds[accepting_socket_fd].flags());
// NOTE: Moving this state to Completed is what causes connect() to unblock on the client side.
accepted_socket->set_setup_state(Socket::SetupState::Completed);
return accepted_socket_fd;
}
int Process::sys$connect(int sockfd, Userspace<const sockaddr*> user_address, socklen_t user_address_size)
{
int fd = alloc_fd();
if (fd < 0)
return fd;
auto description = file_description(sockfd);
if (!description)
return -EBADF;
if (!description->is_socket())
return -ENOTSOCK;
auto& socket = *description->socket();
REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
return socket.connect(*description, user_address, user_address_size, description->is_blocking() ? ShouldBlock::Yes : ShouldBlock::No);
}
int Process::sys$shutdown(int sockfd, int how)
{
REQUIRE_PROMISE(stdio);
if (how & ~SHUT_RDWR)
return -EINVAL;
auto description = file_description(sockfd);
if (!description)
return -EBADF;
if (!description->is_socket())
return -ENOTSOCK;
auto& socket = *description->socket();
REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
return socket.shutdown(how);
}
ssize_t Process::sys$sendmsg(int sockfd, Userspace<const struct msghdr*> user_msg, int flags)
{
REQUIRE_PROMISE(stdio);
struct msghdr msg;
if (!copy_from_user(&msg, user_msg))
return -EFAULT;
if (msg.msg_iovlen != 1)
return -ENOTSUP; // FIXME: Support this :)
Vector<iovec, 1> iovs;
iovs.resize(msg.msg_iovlen);
if (!copy_n_from_user(iovs.data(), msg.msg_iov, msg.msg_iovlen))
return -EFAULT;
Userspace<const sockaddr*> user_addr((FlatPtr)msg.msg_name);
socklen_t addr_length = msg.msg_namelen;
auto description = file_description(sockfd);
if (!description)
return -EBADF;
if (!description->is_socket())
return -ENOTSOCK;
auto& socket = *description->socket();
if (socket.is_shut_down_for_writing())
return -EPIPE;
auto data_buffer = UserOrKernelBuffer::for_user_buffer((u8*)iovs[0].iov_base, iovs[0].iov_len);
if (!data_buffer.has_value())
return -EFAULT;
auto result = socket.sendto(*description, data_buffer.value(), iovs[0].iov_len, flags, user_addr, addr_length);
if (result.is_error())
return result.error();
return result.value();
}
ssize_t Process::sys$recvmsg(int sockfd, Userspace<struct msghdr*> user_msg, int flags)
{
REQUIRE_PROMISE(stdio);
struct msghdr msg;
if (!copy_from_user(&msg, user_msg))
return -EFAULT;
if (msg.msg_iovlen != 1)
return -ENOTSUP; // FIXME: Support this :)
Vector<iovec, 1> iovs;
iovs.resize(msg.msg_iovlen);
if (!copy_n_from_user(iovs.data(), msg.msg_iov, msg.msg_iovlen))
return -EFAULT;
Userspace<sockaddr*> user_addr((FlatPtr)msg.msg_name);
Userspace<socklen_t*> user_addr_length(msg.msg_name ? (FlatPtr)&user_msg.unsafe_userspace_ptr()->msg_namelen : 0);
auto description = file_description(sockfd);
if (!description)
return -EBADF;
if (!description->is_socket())
return -ENOTSOCK;
auto& socket = *description->socket();
if (socket.is_shut_down_for_reading())
return 0;
bool original_blocking = description->is_blocking();
if (flags & MSG_DONTWAIT)
description->set_blocking(false);
auto data_buffer = UserOrKernelBuffer::for_user_buffer((u8*)iovs[0].iov_base, iovs[0].iov_len);
if (!data_buffer.has_value())
return -EFAULT;
timeval timestamp = { 0, 0 };
auto result = socket.recvfrom(*description, data_buffer.value(), iovs[0].iov_len, flags, user_addr, user_addr_length, timestamp);
if (flags & MSG_DONTWAIT)
description->set_blocking(original_blocking);
if (result.is_error())
return result.error();
int msg_flags = 0;
if (result.value() > iovs[0].iov_len) {
ASSERT(socket.type() != SOCK_STREAM);
msg_flags |= MSG_TRUNC;
}
if (socket.wants_timestamp()) {
struct {
cmsghdr cmsg;
timeval timestamp;
} cmsg_timestamp;
socklen_t control_length = sizeof(cmsg_timestamp);
if (msg.msg_controllen < control_length) {
msg_flags |= MSG_CTRUNC;
} else {
cmsg_timestamp = { { control_length, SOL_SOCKET, SCM_TIMESTAMP }, timestamp };
if (!copy_to_user(msg.msg_control, &cmsg_timestamp, control_length))
return -EFAULT;
}
if (!copy_to_user(&user_msg.unsafe_userspace_ptr()->msg_controllen, &control_length))
return -EFAULT;
}
if (!copy_to_user(&user_msg.unsafe_userspace_ptr()->msg_flags, &msg_flags))
return -EFAULT;
return result.value();
}
template<bool sockname, typename Params>
int Process::get_sock_or_peer_name(const Params& params)
{
socklen_t addrlen_value;
if (!copy_from_user(&addrlen_value, params.addrlen, sizeof(socklen_t)))
return -EFAULT;
if (addrlen_value <= 0)
return -EINVAL;
auto description = file_description(params.sockfd);
if (!description)
return -EBADF;
if (!description->is_socket())
return -ENOTSOCK;
auto& socket = *description->socket();
REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
u8 address_buffer[sizeof(sockaddr_un)];
addrlen_value = min(sizeof(sockaddr_un), static_cast<size_t>(addrlen_value));
if constexpr (sockname)
socket.get_local_address((sockaddr*)address_buffer, &addrlen_value);
else
socket.get_peer_address((sockaddr*)address_buffer, &addrlen_value);
if (!copy_to_user(params.addr, address_buffer, addrlen_value))
return -EFAULT;
if (!copy_to_user(params.addrlen, &addrlen_value))
return -EFAULT;
return 0;
}
int Process::sys$getsockname(Userspace<const Syscall::SC_getsockname_params*> user_params)
{
Syscall::SC_getsockname_params params;
if (!copy_from_user(¶ms, user_params))
return -EFAULT;
return get_sock_or_peer_name<true>(params);
}
int Process::sys$getpeername(Userspace<const Syscall::SC_getpeername_params*> user_params)
{
Syscall::SC_getpeername_params params;
if (!copy_from_user(¶ms, user_params))
return -EFAULT;
return get_sock_or_peer_name<false>(params);
}
int Process::sys$getsockopt(Userspace<const Syscall::SC_getsockopt_params*> user_params)
{
Syscall::SC_getsockopt_params params;
if (!copy_from_user(¶ms, user_params))
return -EFAULT;
int sockfd = params.sockfd;
int level = params.level;
int option = params.option;
Userspace<void*> user_value((FlatPtr)params.value);
Userspace<socklen_t*> user_value_size((FlatPtr)params.value_size);
socklen_t value_size;
if (!copy_from_user(&value_size, params.value_size, sizeof(socklen_t)))
return -EFAULT;
auto description = file_description(sockfd);
if (!description)
return -EBADF;
if (!description->is_socket())
return -ENOTSOCK;
auto& socket = *description->socket();
if (has_promised(Pledge::accept) && socket.is_local() && level == SOL_SOCKET && option == SO_PEERCRED) {
// We make an exception for SOL_SOCKET::SO_PEERCRED on local sockets if you've pledged "accept"
} else {
REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
}
return socket.getsockopt(*description, level, option, user_value, user_value_size);
}
int Process::sys$setsockopt(Userspace<const Syscall::SC_setsockopt_params*> user_params)
{
Syscall::SC_setsockopt_params params;
if (!copy_from_user(¶ms, user_params))
return -EFAULT;
Userspace<const void*> user_value((FlatPtr)params.value);
auto description = file_description(params.sockfd);
if (!description)
return -EBADF;
if (!description->is_socket())
return -ENOTSOCK;
auto& socket = *description->socket();
REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
return socket.setsockopt(params.level, params.option, user_value, params.value_size);
}
}
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