mirror of
https://github.com/wpilibsuite/allwpilib
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152 lines
3.5 KiB
C++
152 lines
3.5 KiB
C++
/*
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TCPStream.h
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TCPStream class definition. TCPStream provides methods to trasnfer
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data between peers over a TCP/IP connection.
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------------------------------------------
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Copyright © 2013 [Vic Hargrave - http://vichargrave.com]
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "TCPStream.h"
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#ifdef _WIN32
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#include <WinSock2.h>
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#else
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#include <arpa/inet.h>
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#include <unistd.h>
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#endif
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TCPStream::TCPStream(int sd, struct sockaddr_in* address) : m_sd(sd) {
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char ip[50];
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#ifdef _WIN32
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unsigned long size = sizeof(ip) - 1;
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WSAAddressToString((struct sockaddr*)address, sizeof sockaddr_in, nullptr, ip, &size);
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#else
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inet_ntop(PF_INET, (struct in_addr*)&(address->sin_addr.s_addr), ip,
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sizeof(ip) - 1);
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#endif
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m_peerIP = ip;
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m_peerPort = ntohs(address->sin_port);
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}
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TCPStream::~TCPStream() { close(); }
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std::size_t TCPStream::send(const char* buffer, std::size_t len, Error* err) {
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if (m_sd < 0) {
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*err = kConnectionClosed;
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return 0;
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}
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#ifdef _WIN32
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WSABUF wsaBuf;
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wsaBuf.buf = const_cast<char*>(buffer);
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wsaBuf.len = (ULONG)len;
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DWORD rv;
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bool result = true;
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while (WSASend(m_sd, &wsaBuf, 1, &rv, 0, nullptr, nullptr) == SOCKET_ERROR) {
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if (WSAGetLastError() != WSAEWOULDBLOCK) {
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result = false;
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break;
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}
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Sleep(1);
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}
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if (!result) {
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char Buffer[128];
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#ifdef _MSC_VER
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sprintf_s(Buffer, "Send() failed: WSA error=%d\n", WSAGetLastError());
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#else
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std::snprintf(Buffer, 128, "Send() failed: WSA error=%d\n", WSAGetLastError());
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#endif
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OutputDebugStringA(Buffer);
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*err = kConnectionReset;
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return 0;
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}
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#else
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ssize_t rv = write(m_sd, buffer, len);
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if (rv < 0) {
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*err = kConnectionReset;
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return 0;
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}
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#endif
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return static_cast<std::size_t>(rv);
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}
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std::size_t TCPStream::receive(char* buffer, std::size_t len, Error* err,
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int timeout) {
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if (m_sd < 0) {
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*err = kConnectionClosed;
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return 0;
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}
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#ifdef _WIN32
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int rv;
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#else
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ssize_t rv;
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#endif
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if (timeout <= 0) {
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#ifdef _WIN32
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rv = recv(m_sd, buffer, len, 0);
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#else
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rv = read(m_sd, buffer, len);
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#endif
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}
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else if (WaitForReadEvent(timeout)) {
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#ifdef _WIN32
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rv = recv(m_sd, buffer, len, 0);
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#else
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rv = read(m_sd, buffer, len);
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#endif
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} else {
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*err = kConnectionTimedOut;
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return 0;
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}
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if (rv < 0) {
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*err = kConnectionReset;
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return 0;
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}
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return static_cast<std::size_t>(rv);
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}
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void TCPStream::close() {
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if (m_sd >= 0) {
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#ifdef _WIN32
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::shutdown(m_sd, SD_BOTH);
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closesocket(m_sd);
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#else
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::shutdown(m_sd, SHUT_RDWR);
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::close(m_sd);
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#endif
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}
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m_sd = -1;
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}
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llvm::StringRef TCPStream::getPeerIP() const { return m_peerIP; }
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int TCPStream::getPeerPort() const { return m_peerPort; }
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bool TCPStream::WaitForReadEvent(int timeout) {
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fd_set sdset;
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struct timeval tv;
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tv.tv_sec = timeout;
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tv.tv_usec = 0;
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FD_ZERO(&sdset);
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FD_SET(m_sd, &sdset);
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if (select(m_sd + 1, &sdset, NULL, NULL, &tv) > 0) {
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return true;
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}
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return false;
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}
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