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#include "BWebSocket.h"
#include "SHA1.h"
#include "Base64.h"
#include "TaskMan.h"
#define rotate(value) (((value) << 8) | ((value) >> 24))
void Balau::WebSocketWorker::Do() {
uint8_t c;
try {
while (!m_socket->isClosed()) {
switch (m_state) {
case READ_H:
m_socket->read(&c, 1);
if (m_socket->isClosed()) return;
m_fin = c & 0x80;
if ((c >> 4) & 7) goto error;
c &= 15;
if (!m_firstFragment && c) goto error;
if (m_firstFragment)
m_opcode = c;
m_state = READ_PLB;
case READ_PLB:
m_socket->read(&c, 1);
if (m_socket->isClosed()) return;
m_hasMask = c & 0x80;
if (m_enforceServer && !m_hasMask)
goto error;
if (m_enforceClient && m_hasMask)
goto error;
m_payloadLen = c & 0x7f;
m_state = READ_PLL;
if (m_payloadLen == 126) {
m_payloadLen = 0;
m_remainingBytes = 2;
} else if (m_payloadLen == 127) {
m_payloadLen = 0;
m_remainingBytes = 8;
} else {
m_remainingBytes = 0;
}
case READ_PLL:
while (m_remainingBytes) {
m_socket->read(&c, 1);
if (m_socket->isClosed()) return;
m_payloadLen <<= 8;
m_payloadLen += c;
m_remainingBytes--;
}
m_state = READ_MK;
if (m_firstFragment)
m_totalLen = m_payloadLen;
else
m_totalLen += m_payloadLen;
if (m_hasMask) m_remainingBytes = 4;
case READ_MK:
while (m_remainingBytes) {
m_socket->read(&c, 1);
if (m_socket->isClosed()) return;
m_mask <<= 8;
m_mask += c;
m_remainingBytes--;
}
m_state = READ_PL;
m_remainingBytes = m_payloadLen;
if (m_totalLen >= MAX_WEBSOCKET_LIMIT)
goto error;
m_payload = (uint8_t *)realloc(m_payload, m_totalLen + (m_opcode == OPCODE_TEXT ? 1 : 0));
case READ_PL:
while (m_remainingBytes) {
int r = m_socket->read(m_payload + m_totalLen - m_remainingBytes, m_remainingBytes);
if (m_socket->isClosed()) return;
if (r < 0)
goto error;
m_remainingBytes -= r;
}
m_firstFragment = m_fin;
if (m_fin) {
if (m_hasMask) {
for (int i = 0; i < m_totalLen; i++) {
m_payload[i] ^= m_mask >> 24;
m_mask = rotate(m_mask);
}
}
if (m_opcode == OPCODE_TEXT)
m_payload[m_payloadLen] = 0;
processMessage();
}
m_state = READ_H;
}
}
error:
disconnect();
}
catch (Balau::EAgain & e) {
taskSwitch();
}
}
void Balau::WebSocketWorker::processMessage() {
switch (m_opcode) {
case OPCODE_PING:
processPing();
break;
case OPCODE_PONG:
processPong();
break;
case OPCODE_TEXT:
case OPCODE_BIN:
receiveMessage(m_payload, m_payloadLen, m_opcode == OPCODE_BIN);
break;
default:
disconnect();
}
}
void Balau::WebSocketWorker::processPing() {
}
void Balau::WebSocketWorker::processPong() {
}
void Balau::WebSocketServerBase::sendError(IO<Handle> out, const char * serverName) {
const char * status = Http::getStatusMsg(400);
String errorMsg;
errorMsg.set(
"HTTP/1.0 400 %s\r\n"
"Content-Type: text/plain; charset=UTF-8\r\n"
"Connection: close\r\n"
"Server: %s\r\n"
"\r\n"
"400 - %s",
status, serverName, status);
out->writeString(errorMsg);
}
static const Balau::String magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
bool Balau::WebSocketServerBase::Do(HttpServer * server, Http::Request & req, HttpServer::Action::ActionMatch & match, IO<Handle> out) throw (GeneralException) {
WebSocketWorker * worker = NULL;
if (!req.upgrade)
goto error;
if (req.headers["Upgrade"] != "websocket")
goto error;
if (req.headers["Sec-WebSocket-Key"] == "")
goto error;
worker = spawnWorker(out, req.uri);
if (!worker->parse(req))
goto error;
TaskMan::registerTask(worker);
{
HttpServer::Response response(server, req, out);
String & key = req.headers["Sec-WebSocket-Key"];
uint8_t * toHash = (uint8_t *)alloca(key.strlen() + magic.strlen());
memcpy(toHash, key.to_charp(), key.strlen());
memcpy(toHash + key.strlen(), magic.to_charp(), magic.strlen());
SHA1 h;
uint8_t digest[20];
h.update(toHash, key.strlen() + magic.strlen());
h.final(digest);
String accept = Base64::encode(digest, 20);
response.SetResponseCode(101);
response.AddHeader("Upgrade: websocket");
response.AddHeader("Connection: Upgrade");
response.AddHeader("Sec-WebSocket-Accept", accept);
response.AddHeader("Sec-WebSocket-Version: 13");
response.SetContentType("");
response.Flush();
}
return false;
error:
if (worker)
TaskMan::registerTask(worker);
sendError(out, server->getServerName().to_charp());
return false;
}
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