David Baird
353 lines
13 KiB
C++
353 lines
13 KiB
C++
#ifndef EASYWSCLIENT_HPP_20120819_MIOFVASDTNUASZDQPLFD
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#define EASYWSCLIENT_HPP_20120819_MIOFVASDTNUASZDQPLFD
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// This code comes from,
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// https://github.com/dhbaird/easywsclient
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// To get the latest version,
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// wget https://raw.github.com/dhbaird/easywsclient/master/easywsclient.hpp
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#include <fcntl.h>
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#include <netdb.h>
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#include <netinet/tcp.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <vector>
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#include <string>
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namespace easywsclient {
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struct WebSocket {
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typedef WebSocket * pointer;
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struct Callback { virtual void operator()(const std::string & message) = 0; };
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// Factories (in the spirit of PIMPL):
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static pointer create_dummy();
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static pointer from_url(std::string url);
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static int hostname_connect(std::string hostname, int port); // <-- convenience function
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// Interfaces:
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virtual ~WebSocket() { }
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virtual void poll() = 0;
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virtual void send(std::string message) = 0;
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template<class Callable>
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void dispatch(Callable callable) {
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// ...don't you just want to love C++, right about here?
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// (N.B. this is why the C++11 lambda syntax was invented)
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struct _Callback : public Callback {
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Callable & callable;
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_Callback(Callable & callable) : callable(callable) { }
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void operator()(const std::string & message) { callable(message); }
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};
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_Callback callback(callable);
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_dispatch(callback);
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}
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private:
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virtual void _dispatch(Callback & callable) = 0;
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};
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// Everything in this #if block could be separated out into a .cpp file, if you
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// so desired,
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#if defined(EASYWSCLIENT_COMPILATION_UNIT)
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struct _DummyWebSocket : public WebSocket
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{
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void poll() { }
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void send(std::string message) { }
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void _dispatch(Callback & callable) { }
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};
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struct _RealWebSocket : public WebSocket
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{
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#if 0
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http://tools.ietf.org/html/rfc6455#section-5.2 Base Framing Protocol
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-------+-+-------------+-------------------------------+
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|F|R|R|R| opcode|M| Payload len | Extended payload length |
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|I|S|S|S| (4) |A| (7) | (16/64) |
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|N|V|V|V| |S| | (if payload len==126/127) |
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| |1|2|3| |K| | |
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+-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
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| Extended payload length continued, if payload len == 127 |
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+ - - - - - - - - - - - - - - - +-------------------------------+
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| |Masking-key, if MASK set to 1 |
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+-------------------------------+-------------------------------+
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| Masking-key (continued) | Payload Data |
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+-------------------------------- - - - - - - - - - - - - - - - +
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: Payload Data continued ... :
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+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
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| Payload Data continued ... |
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+---------------------------------------------------------------+
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#endif
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struct wsheader_type {
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int header_size;
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bool fin;
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bool mask;
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enum opcode_type {
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CONTINUATION = 0x0,
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TEXT_FRAME = 0x1,
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BINARY_FRAME = 0x2,
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CLOSE = 8,
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PING = 9,
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PONG = 0xa,
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} opcode;
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int N0;
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uint64_t N;
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uint8_t masking_key[4];
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};
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std::vector<char> rxbuf;
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std::vector<char> txbuf;
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int sockfd;
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bool closed;
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_RealWebSocket(int sockfd) : sockfd(sockfd), closed(false) {
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}
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void poll() {
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if (closed) { return; }
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while (true) {
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// FD_ISSET(0, &rfds) will be true
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int N = rxbuf.size();
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ssize_t ret;
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rxbuf.resize(N + 1500);
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ret = recv(sockfd, &rxbuf[0] + N, 1500, 0);
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if (false) { }
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else if (ret < 0) {
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rxbuf.resize(N);
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break;
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}
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else if (ret == 0) {
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rxbuf.resize(N);
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closed = true;
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close(sockfd);
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break;
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}
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else {
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rxbuf.resize(N + ret);
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}
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}
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while (txbuf.size()) {
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int ret;
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ret = ::send(sockfd, &txbuf[0], txbuf.size(), 0);
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if (ret > 0) { txbuf.erase(txbuf.begin(), txbuf.begin() + ret); }
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else { break; }
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}
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}
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// Callable must have signature: void(const std::string & message).
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// Should work with C functions, C++ functors, and C++11 std::function and
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// lambda:
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//template<class Callable>
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//void dispatch(Callable callable) {
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virtual void _dispatch(WebSocket::Callback & callable) {
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// TODO: consider acquiring a lock on rxbuf...
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while (true) {
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wsheader_type ws;
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if (rxbuf.size() < 2) { return; /* Need at least 2 */ }
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const uint8_t * data = (uint8_t *) &rxbuf[0]; // peek, but don't consume
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ws.fin = (data[0] & 0x80) == 0x80;
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ws.opcode = (wsheader_type::opcode_type) (data[0] & 0x0f);
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ws.mask = (data[1] & 0x80) == 0x80;
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ws.N0 = (data[1] & 0x7f);
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ws.header_size = 2 + (ws.N0 == 126? 2 : 0) + (ws.N0 == 127? 6 : 0) + (ws.mask? 4 : 0);
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if (rxbuf.size() < ws.header_size) { return; /* Need: ws.header_size - rxbuf.size() */ }
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int i;
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if (ws.N0 < 126) {
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ws.N = ws.N0;
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i = 2;
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}
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else if (ws.N0 == 126) {
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ws.N = 0;
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ws.N |= ((uint64_t) data[2]) << 8;
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ws.N |= ((uint64_t) data[3]) << 0;
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i = 4;
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}
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else if (ws.N0 == 127) {
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ws.N = 0;
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ws.N |= ((uint64_t) data[2]) << 56;
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ws.N |= ((uint64_t) data[3]) << 48;
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ws.N |= ((uint64_t) data[4]) << 40;
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ws.N |= ((uint64_t) data[5]) << 32;
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ws.N |= ((uint64_t) data[6]) << 24;
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ws.N |= ((uint64_t) data[7]) << 16;
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ws.N |= ((uint64_t) data[8]) << 8;
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ws.N |= ((uint64_t) data[9]) << 0;
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i = 10;
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}
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if (ws.mask) {
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ws.masking_key[0] = ((uint8_t) data[i+0]) << 0;
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ws.masking_key[1] = ((uint8_t) data[i+1]) << 0;
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ws.masking_key[2] = ((uint8_t) data[i+2]) << 0;
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ws.masking_key[3] = ((uint8_t) data[i+3]) << 0;
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}
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else {
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ws.masking_key[0] = 0;
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ws.masking_key[1] = 0;
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ws.masking_key[2] = 0;
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ws.masking_key[3] = 0;
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}
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if (rxbuf.size() < ws.header_size+ws.N) { return; /* Need: ws.header_size+ws.N - rxbuf.size() */ }
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// We got a whole message, now do something with it:
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if (false) { }
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else if (ws.opcode == wsheader_type::TEXT_FRAME && ws.fin) {
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if (ws.mask) { for (size_t i = 0; i != ws.N; ++i) { rxbuf[i+ws.header_size] ^= ws.masking_key[i&0x3]; } }
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std::string data(rxbuf.begin()+ws.header_size, rxbuf.begin()+ws.header_size+ws.N);
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callable((const std::string) data);
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}
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else if (ws.opcode == wsheader_type::PING) { }
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else if (ws.opcode == wsheader_type::PONG) { }
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else if (ws.opcode == wsheader_type::CLOSE) { closed = true; close(sockfd); }
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else { fprintf(stderr, "ERROR: Got unexpected WebSocket message.\n"); closed = true; close(sockfd); }
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rxbuf.erase(rxbuf.begin(), rxbuf.begin() + ws.header_size+ws.N);
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}
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}
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void send(std::string message) {
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// TODO: consider acquiring a lock on txbuf...
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std::vector<uint8_t> header;
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header.assign(2 + (message.size() >= 126 ? 2 : 0) + (message.size() >= 65536 ? 6 : 0), 0);
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header[0] = 0x80 | wsheader_type::TEXT_FRAME;
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if (false) { }
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else if (message.size() < 126) {
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header[1] = message.size();
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}
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else if (message.size() < 65536) {
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header[1] = 126;
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header[2] = (message.size() >> 8) & 0xff;
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header[3] = (message.size() >> 0) & 0xff;
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}
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else { // TODO: run coverage testing here
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header[1] = 127;
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header[2] = (message.size() >> 56) & 0xff;
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header[3] = (message.size() >> 48) & 0xff;
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header[4] = (message.size() >> 40) & 0xff;
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header[5] = (message.size() >> 32) & 0xff;
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header[6] = (message.size() >> 24) & 0xff;
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header[7] = (message.size() >> 16) & 0xff;
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header[8] = (message.size() >> 8) & 0xff;
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header[9] = (message.size() >> 0) & 0xff;
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}
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txbuf.insert(txbuf.end(), header.begin(), header.end());
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txbuf.insert(txbuf.end(), message.begin(), message.end());
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}
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};
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int WebSocket::hostname_connect(std::string hostname, int port) {
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struct addrinfo hints;
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struct addrinfo *result;
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struct addrinfo *p;
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int ret;
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int sockfd = -1;
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char sport[16];
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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snprintf(sport, 16, "%d", port);
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if ((ret = getaddrinfo(hostname.c_str(), sport, &hints, &result)) != 0)
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{
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fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ret));
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return 1;
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}
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for(p = result; p != NULL; p = p->ai_next)
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{
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sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
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if (sockfd == -1) { continue; }
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if (connect(sockfd, p->ai_addr, p->ai_addrlen) != -1) {
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break;
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}
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close(sockfd);
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sockfd = -1;
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}
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freeaddrinfo(result);
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return sockfd;
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}
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WebSocket::pointer WebSocket::create_dummy() {
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static pointer dummy = pointer(new _DummyWebSocket);
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return dummy;
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}
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WebSocket::pointer WebSocket::from_url(std::string url) {
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char host[128];
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int port;
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char path[128];
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if (false) { }
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else if (sscanf(url.c_str(), "ws://%[^:]:%d/%s", host, &port, path) == 3) {
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}
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else if (sscanf(url.c_str(), "ws://%[^/]/%s", host, path) == 2) {
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port = 80;
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}
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else {
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fprintf(stderr, "ERROR: Could not parse WebSocket url: %s\n", url.c_str());
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return NULL;
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}
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int sockfd = hostname_connect(host, port);
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if (sockfd == -1) {
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fprintf(stderr, "Unable to connect to %s:%d\n", host, port);
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return NULL;
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}
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{
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// XXX: this should be done non-blocking,
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char line[256];
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int status;
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int i;
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snprintf(line, 256, "GET /%s HTTP/1.1\r\n", path); ::send(sockfd, line, strlen(line), 0);
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snprintf(line, 256, "Host: %s:%d\r\n", host, port); ::send(sockfd, line, strlen(line), 0);
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snprintf(line, 256, "Upgrade: websocket\r\n", host, port); ::send(sockfd, line, strlen(line), 0);
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snprintf(line, 256, "Connection: Upgrade\r\n", host, port); ::send(sockfd, line, strlen(line), 0);
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snprintf(line, 256, "Sec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw==\r\n", host, port); ::send(sockfd, line, strlen(line), 0);
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snprintf(line, 256, "Sec-WebSocket-Version: 13\r\n", host, port); ::send(sockfd, line, strlen(line), 0);
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snprintf(line, 256, "\r\n", host, port); ::send(sockfd, line, strlen(line), 0);
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for (i = 0; i < 2 || i < 255 && line[i-2] != '\r' && line[i-1] != '\n'; ++i) { if (recv(sockfd, line+i, 1, 0) == 0) { return NULL; } }
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line[i] = 0;
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if (i == 255) { fprintf(stderr, "ERROR: Got invalid status line connecting to: %s\n", url.c_str()); return NULL; }
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if (sscanf(line, "HTTP/1.1 %d", &status) != 1 || status != 101) { fprintf(stderr, "ERROR: Got bad status connecting to %s: %s", url.c_str(), line); return NULL; }
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// TODO: verify response headers,
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while (true) {
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for (i = 0; i < 2 || i < 255 && line[i-2] != '\r' && line[i-1] != '\n'; ++i) { if (recv(sockfd, line+i, 1, 0) == 0) { return NULL; } }
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if (line[0] == '\r' && line[1] == '\n') { break; }
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}
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}
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int flag = 1;
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setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, (char*) &flag, sizeof(flag)); // Disable Nagle's algorithm
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fcntl(sockfd, F_SETFL, O_NONBLOCK);
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fprintf(stderr, "Connected to: %s\n", url.c_str());
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return pointer(new _RealWebSocket(sockfd));
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}
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#endif // defined(EASYWSCLIENT_COMPILATION_UNIT)
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} // namespace easywsclient
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#endif /* EASYWSCLIENT_HPP_20120819_MIOFVASDTNUASZDQPLFD */
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