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// Copyright (c) 2020-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <compat.h>
#include <logging.h>
#include <tinyformat.h>
#include <util/sock.h>
#include <util/system.h>
#include <util/time.h>
#include <codecvt>
#include <cwchar>
#include <locale>
#include <string>
#ifdef USE_POLL
#include <poll.h>
#endif
Sock::Sock() : m_socket(INVALID_SOCKET) {}
Sock::Sock(SOCKET s) : m_socket(s) {}
Sock::Sock(Sock&& other)
{
m_socket = other.m_socket;
other.m_socket = INVALID_SOCKET;
}
Sock::~Sock() { Reset(); }
Sock& Sock::operator=(Sock&& other)
{
Reset();
m_socket = other.m_socket;
other.m_socket = INVALID_SOCKET;
return *this;
}
SOCKET Sock::Get() const { return m_socket; }
SOCKET Sock::Release()
{
const SOCKET s = m_socket;
m_socket = INVALID_SOCKET;
return s;
}
void Sock::Reset() { CloseSocket(m_socket); }
ssize_t Sock::Send(const void* data, size_t len, int flags) const
{
return send(m_socket, static_cast<const char*>(data), len, flags);
}
ssize_t Sock::Recv(void* buf, size_t len, int flags) const
{
return recv(m_socket, static_cast<char*>(buf), len, flags);
}
bool Sock::Wait(std::chrono::milliseconds timeout, Event requested) const
{
#ifdef USE_POLL
pollfd fd;
fd.fd = m_socket;
fd.events = 0;
if (requested & RECV) {
fd.events |= POLLIN;
}
if (requested & SEND) {
fd.events |= POLLOUT;
}
return poll(&fd, 1, count_milliseconds(timeout)) != SOCKET_ERROR;
#else
if (!IsSelectableSocket(m_socket)) {
return false;
}
fd_set fdset_recv;
fd_set fdset_send;
FD_ZERO(&fdset_recv);
FD_ZERO(&fdset_send);
if (requested & RECV) {
FD_SET(m_socket, &fdset_recv);
}
if (requested & SEND) {
FD_SET(m_socket, &fdset_send);
}
timeval timeout_struct = MillisToTimeval(timeout);
return select(m_socket + 1, &fdset_recv, &fdset_send, nullptr, &timeout_struct) != SOCKET_ERROR;
#endif /* USE_POLL */
}
#ifdef WIN32
std::string NetworkErrorString(int err)
{
wchar_t buf[256];
buf[0] = 0;
if(FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_MAX_WIDTH_MASK,
nullptr, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
buf, ARRAYSIZE(buf), nullptr))
{
return strprintf("%s (%d)", std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>,wchar_t>().to_bytes(buf), err);
}
else
{
return strprintf("Unknown error (%d)", err);
}
}
#else
std::string NetworkErrorString(int err)
{
char buf[256];
buf[0] = 0;
/* Too bad there are two incompatible implementations of the
* thread-safe strerror. */
const char *s;
#ifdef STRERROR_R_CHAR_P /* GNU variant can return a pointer outside the passed buffer */
s = strerror_r(err, buf, sizeof(buf));
#else /* POSIX variant always returns message in buffer */
s = buf;
if (strerror_r(err, buf, sizeof(buf)))
buf[0] = 0;
#endif
return strprintf("%s (%d)", s, err);
}
#endif
bool CloseSocket(SOCKET& hSocket)
{
if (hSocket == INVALID_SOCKET)
return false;
#ifdef WIN32
int ret = closesocket(hSocket);
#else
int ret = close(hSocket);
#endif
if (ret) {
LogPrintf("Socket close failed: %d. Error: %s\n", hSocket, NetworkErrorString(WSAGetLastError()));
}
hSocket = INVALID_SOCKET;
return ret != SOCKET_ERROR;
}
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