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//
// detail/impl/socket_ops_ext.ipp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
// Copyright (C) 2016-2019 Bayerische Motoren Werke Aktiengesellschaft (BMW AG)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_boost or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_ASIO_DETAIL_SOCKET_OPS_EXT_IPP
#define BOOST_ASIO_DETAIL_SOCKET_OPS_EXT_IPP
#include <boost/asio/detail/impl/socket_ops.ipp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
namespace socket_ops {
signed_size_type recvfrom(socket_type s, buf* bufs, size_t count,
int flags, socket_addr_type* addr, std::size_t* addrlen,
boost::system::error_code& ec, boost::asio::ip::address& da)
{
clear_last_error();
#if defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
GUID WSARecvMsg_GUID = WSAID_WSARECVMSG;
LPFN_WSARECVMSG WSARecvMsg;
DWORD NumberOfBytes;
error_wrapper(WSAIoctl(s, SIO_GET_EXTENSION_FUNCTION_POINTER,
&WSARecvMsg_GUID, sizeof WSARecvMsg_GUID,
&WSARecvMsg, sizeof WSARecvMsg,
&NumberOfBytes, NULL, NULL), ec);
if (ec.value() == SOCKET_ERROR) {
WSARecvMsg = NULL;
return 0;
}
WSABUF wsaBuf;
WSAMSG msg;
char controlBuffer[1024];
msg.name = addr;
msg.namelen = *addrlen;
wsaBuf.buf = bufs->buf;
wsaBuf.len = bufs->len;
msg.lpBuffers = &wsaBuf;
msg.dwBufferCount = count;
msg.Control.len = sizeof controlBuffer;
msg.Control.buf = controlBuffer;
msg.dwFlags = flags;
DWORD dwNumberOfBytesRecvd;
signed_size_type result = error_wrapper(WSARecvMsg(s, &msg, &dwNumberOfBytesRecvd, NULL, NULL), ec);
if (result >= 0) {
ec = boost::system::error_code();
// Find destination address
for (LPWSACMSGHDR cmsg = WSA_CMSG_FIRSTHDR(&msg);
cmsg != NULL;
cmsg = WSA_CMSG_NXTHDR(&msg, cmsg))
{
if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_PKTINFO)
{
struct in_pktinfo *pi = (struct in_pktinfo *) WSA_CMSG_DATA(cmsg);
if (pi)
{
da = boost::asio::ip::address_v4(ntohl(pi->ipi_addr.s_addr));
}
} else
if (cmsg->cmsg_level == IPPROTO_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO)
{
struct in6_pktinfo *pi = (struct in6_pktinfo *) WSA_CMSG_DATA(cmsg);
if (pi)
{
boost::asio::ip::address_v6::bytes_type b;
memcpy(b.data(), pi->ipi6_addr.s6_addr, sizeof(pi->ipi6_addr.s6_addr));
da = boost::asio::ip::address_v6(b);
}
}
}
} else {
dwNumberOfBytesRecvd = -1;
}
return dwNumberOfBytesRecvd;
#else // defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
char cmbuf[0x100];
msghdr msg = msghdr();
init_msghdr_msg_name(msg.msg_name, addr);
msg.msg_namelen = static_cast<int>(*addrlen);
msg.msg_iov = bufs;
msg.msg_iovlen = static_cast<int>(count);
msg.msg_control = cmbuf;
msg.msg_controllen = sizeof(cmbuf);
signed_size_type result = error_wrapper(::recvmsg(s, &msg, flags), ec);
*addrlen = msg.msg_namelen;
if (result >= 0) {
ec = boost::system::error_code();
// Find destination address
for (struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
cmsg != NULL;
cmsg = CMSG_NXTHDR(&msg, cmsg))
{
if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_PKTINFO)
{
struct in_pktinfo *pi = (struct in_pktinfo *) CMSG_DATA(cmsg);
if (pi)
{
da = boost::asio::ip::address_v4(ntohl(pi->ipi_addr.s_addr));
}
} else
if (cmsg->cmsg_level == IPPROTO_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO)
{
struct in6_pktinfo *pi = (struct in6_pktinfo *) CMSG_DATA(cmsg);
if (pi)
{
boost::asio::ip::address_v6::bytes_type b;
memcpy(b.data(), pi->ipi6_addr.s6_addr, sizeof(pi->ipi6_addr.s6_addr));
da = boost::asio::ip::address_v6(b);
}
}
}
}
return result;
#endif // defined(BOOST_ASIO_WINDOWS) || defined(__CYGWIN__)
}
size_t sync_recvfrom(socket_type s, state_type state, buf* bufs,
size_t count, int flags, socket_addr_type* addr,
std::size_t* addrlen, boost::system::error_code& ec, boost::asio::ip::address& da)
{
if (s == invalid_socket)
{
ec = boost::asio::error::bad_descriptor;
return 0;
}
// Read some data.
for (;;)
{
// Try to complete the operation without blocking.
signed_size_type bytes = socket_ops::recvfrom(
s, bufs, count, flags, addr, addrlen, ec, da);
// Check if operation succeeded.
if (bytes >= 0)
return bytes;
// Operation failed.
if ((state & user_set_non_blocking)
|| (ec != boost::asio::error::would_block
&& ec != boost::asio::error::try_again))
return 0;
// Wait for socket to become ready.
if (socket_ops::poll_read(s, 0, -1, ec) < 0)
return 0;
}
}
#if defined(BOOST_ASIO_HAS_IOCP)
void complete_iocp_recvfrom(
const weak_cancel_token_type& cancel_token,
boost::system::error_code& ec, boost::asio::ip::address& da)
{
// Map non-portable errors to their portable counterparts.
if (ec.value() == ERROR_NETNAME_DELETED)
{
if (cancel_token.expired())
ec = boost::asio::error::operation_aborted;
else
ec = boost::asio::error::connection_reset;
}
else if (ec.value() == ERROR_PORT_UNREACHABLE)
{
ec = boost::asio::error::connection_refused;
}
}
#else // defined(BOOST_ASIO_HAS_IOCP)
bool non_blocking_recvfrom(socket_type s,
buf* bufs, size_t count, int flags,
socket_addr_type* addr, std::size_t* addrlen,
boost::system::error_code& ec, size_t& bytes_transferred, boost::asio::ip::address& da)
{
for (;;)
{
// Read some data.
signed_size_type bytes = socket_ops::recvfrom(
s, bufs, count, flags, addr, addrlen, ec, da);
// Retry operation if interrupted by signal.
if (ec == boost::asio::error::interrupted)
continue;
// Check if we need to run the operation again.
if (ec == boost::asio::error::would_block
|| ec == boost::asio::error::try_again)
return false;
// Operation is complete.
if (bytes >= 0)
{
ec = boost::system::error_code();
bytes_transferred = bytes;
}
else
bytes_transferred = 0;
return true;
}
}
#endif // defined(BOOST_ASIO_HAS_IOCP)
} // namespace socket_ops
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_SOCKET_OPS_EXT_IPP
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