159 lines
3.8 KiB
C++
159 lines
3.8 KiB
C++
/*
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U2FDevice - A program to allow Raspberry Pi Zeros to act as U2F tokens
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Copyright (C) 2018 Michael Kuc
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "IO.hpp"
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#include "Macro.hpp"
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#include "Streams.hpp"
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#include "U2FDevice.hpp"
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#include "u2f.hpp"
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#include <android/log.h>
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#include <array>
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#include <chrono>
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#include <cstdio>
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#include <ctime>
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#include <fcntl.h>
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#include <iostream>
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#include <memory>
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#include <poll.h>
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#include <ratio>
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#include <stdexcept>
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#include <string>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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using namespace std;
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bool bytesAvailable(size_t count);
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vector<uint8_t>& getBuffer();
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#ifdef DEBUG_STREAMS
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string cacheDirectory{ DEBUG_STREAMS };
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#endif
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#ifdef HID_SOCKET
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string clientSocket{};
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#endif
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vector<uint8_t> readNonBlock(const size_t count) {
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if (!bytesAvailable(count))
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return vector<uint8_t>{};
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auto& buffer = getBuffer();
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auto buffStart = buffer.begin(), buffEnd = buffer.begin() + count;
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vector<uint8_t> bytes{ buffStart, buffEnd };
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buffer.erase(buffStart, buffEnd);
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errno = 0;
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return bytes;
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}
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void write(const vector<uint8_t>& bytes) {
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size_t totalBytes = 0;
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auto hostDescriptor = *getHostDescriptor();
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while (totalBytes < bytes.size()) {
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auto writtenBytes =
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send(hostDescriptor, bytes.data() + totalBytes, bytes.size() - totalBytes, 0);
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if (writtenBytes > 0)
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totalBytes += writtenBytes;
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else if (errno != 0 && errno != EAGAIN &&
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errno != EWOULDBLOCK) // Expect file blocking behaviour
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ERR();
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}
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errno = 0;
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}
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bool bytesAvailable(const size_t count) {
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auto startTime = std::chrono::high_resolution_clock::now();
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chrono::duration<double, milli> delay{ 0 };
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while (delay.count() < U2FHID_TRANS_TIMEOUT) {
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if (getBuffer().size() >= count) {
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#ifdef DEBUG_MSGS
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clog << "Requested " << count << " bytes" << endl;
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#endif
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return true;
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}
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delay = chrono::high_resolution_clock::now() - startTime;
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}
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#ifdef DEBUG_MSGS
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cerr << "Failed to obtain " << count << " bytes, having " << getBuffer().size() << endl;
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#endif
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return false;
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}
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vector<uint8_t>& bufferVar() {
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static vector<uint8_t> buffer{};
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return buffer;
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}
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vector<uint8_t>& getBuffer() {
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const timespec delay{ 0, 10'000'000 };
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auto& buff = bufferVar();
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array<uint8_t, HID_RPT_SIZE> bytes{};
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auto hostDescriptor = *getHostDescriptor();
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pollfd pFD{ hostDescriptor, POLLIN };
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while (true) {
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ppoll(&pFD, 1, &delay, 0);
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if (pFD.revents & POLLIN) {
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auto readByteCount = recv(hostDescriptor, bytes.data(), HID_RPT_SIZE, 0);
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if (readByteCount > 0 && readByteCount != HID_RPT_SIZE) {
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// Failed to copy an entire packet in, so log this packet
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#ifdef DEBUG_MSGS
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cerr << "Only retrieved " << readByteCount << " bytes from expected full packet."
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<< endl;
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#endif
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}
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if (readByteCount > 0) {
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copy(bytes.begin(), bytes.begin() + readByteCount, back_inserter(buff));
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#ifdef DEBUG_STREAMS
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fwrite(bytes.data(), 1, readByteCount, getComHostStream().get());
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#endif
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} else if (errno != EAGAIN && errno != EWOULDBLOCK) // Expect read would block
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{
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ERR();
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#ifdef DEBUG_MSGS
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cerr << "Unknown stream error: " << errno << endl;
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#endif
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break;
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} else {
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errno = 0;
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break; // Escape loop if blocking would occur
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}
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} else
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break;
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}
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return buff;
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}
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