Diff: HTTPD_ws.cpp

Revision:

0:d18dff347122

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HTTPD_ws.cpp	Wed Nov 13 01:58:04 2013 +0000
@@ -0,0 +1,198 @@
+/* Copyright (C) 2013 Hiroshi Suga, MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "HTTPD.h"
+#include "sha1.h"
+
+void HTTPD::recvWS (int id, char c) {
+
+    switch (_state[id].mode) {
+    case MODE_WEBSOCKET:
+        if (_state[id].n == 0) {
+            // flag
+            _state[id].websocket_opcode = c & 0x0f;
+            _state[id].websocket_flg = c << 8;
+            _state[id].n ++;
+        } else
+        if (_state[id].n == 1) {
+            // length 7bit
+            _state[id].websocket_flg |= c;
+            _state[id].length = c & 0x7f;
+            _state[id].n ++;
+            if (_state[id].length < 126) {
+                _state[id].n = 0;
+                if (_state[id].length) {
+                    if (_state[id].websocket_flg & 0x0080) {
+                        _state[id].mode = MODE_WEBSOCKET_MASK;
+                    } else {
+                        _state[id].mode = MODE_WEBSOCKET_BODY;
+                    }
+                } else {
+                    _state[id].mode = MODE_WEBSOCKET_ENTER;
+                }
+                DBG("ws length %d\r\n", _state[id].length);
+            }
+        } else {
+            // length 16bit,64bit
+            if (_state[id].n == 2) {
+                _state[id].length = c;
+                _state[id].n ++;
+            } else
+            if (_state[id].n < 9 && (_state[id].websocket_flg & 0x7f) == 127) {
+                // 64bit
+                _state[id].length = (_state[id].length << 8) | c;
+                _state[id].n ++;
+            } else {
+                // end
+                _state[id].length = (_state[id].length << 8) | c;
+                _state[id].n = 0;
+                if (_state[id].websocket_flg & 0x0080) {
+                    _state[id].mode = MODE_WEBSOCKET_MASK;
+                } else {
+                    _state[id].mode = MODE_WEBSOCKET_BODY;
+                }
+                DBG("ws length2 %d\r\n", _state[id].length);
+            }
+        }
+        break;
+    case MODE_WEBSOCKET_MASK:
+        // masking key
+        _state[id].websocket_mask[_state[id].n] = c;
+        _state[id].n ++;
+        if (_state[id].n >= 4) {
+            _state[id].n = 0;
+            _state[id].mode = MODE_WEBSOCKET_BODY;
+            DBG("ws mask\r\n");
+        }
+        break;
+    case MODE_WEBSOCKET_BODY:
+        // payload
+        if (_state[id].websocket_flg & 0x0080) {
+            // un-mask
+            _state[id].buf->queue(c ^ _state[id].websocket_mask[_state[id].n & 0x03]); 
+        } else {
+            _state[id].buf->queue(c); 
+        }
+        _state[id].n ++;
+        if (_state[id].n >= _state[id].length) {
+            _state[id].mode = MODE_WEBSOCKET_ENTER;
+        }
+        break;
+    }
+}
+
+int HTTPD::parseWebsocket (int id) {
+    int i;
+
+    DBG("ws opcode %d\r\n", _state[id].websocket_opcode);
+    switch (_state[id].websocket_opcode) {
+    case 0x00: // continuation
+        break;
+    case 0x01: // text
+    case 0x02: // binary
+        i = getHandler(_state[id].uri);
+        if (i >= 0) {
+            if (_handler[i].funcCgi) {
+                // cgi
+                _handler[i].funcCgi(id);
+            }
+        }
+        break;
+    case 0x08: // close
+        _state[id].client->close();
+        break;
+    case 0x09: // ping
+        {
+        char pong[_state[id].n + 2];
+        pong[0] = 0x8a;
+        pong[1] = 0x04;
+        for (i = 0; i < _state[id].length; i ++) {
+            if (_state[id].buf->dequeue(&pong[i + 2]) == false) break;
+        }
+        _state[id].client->send_all(pong, _state[id].length + 2);
+        }
+        break;
+    case 0x0a: // pong
+        break;
+    default:
+        break;
+    }
+    _state[id].n = 0;
+    _state[id].length = 0;
+    return 0;
+}
+
+int HTTPD::acceptWebsocket (int id) {
+    char buf[HTTPD_CMD_SIZE], buf2[HTTPD_CMD_SIZE];
+    
+    DBG("websocket accept: %d\r\n", id);
+
+    strcpy(buf, "HTTP/1.1 101 Switching Protocols\r\n");
+    _state[id].client->send_all(buf, strlen(buf));
+    strcpy(buf, "Upgrade: websocket\r\n");
+    _state[id].client->send_all(buf, strlen(buf));
+    strcpy(buf, "Connection: Upgrade\r\n");
+    _state[id].client->send_all(buf, strlen(buf));
+
+    strcpy(buf, "Sec-WebSocket-Accept: ");
+    _state[id].client->send_all(buf, strlen(buf));
+    strcpy(buf, _state[id].websocket_key);
+    strcat(buf, "258EAFA5-E914-47DA-95CA-C5AB0DC85B11");
+    sha1(buf, strlen(buf), buf2);
+    base64encode(buf2, 20, buf, sizeof(buf));
+    _state[id].client->send_all(buf, strlen(buf));
+    strcpy(buf, "\r\n\r\n");
+    _state[id].client->send_all(buf, strlen(buf));
+    _state[id].client->set_blocking(true, HTTPD_TIMEOUT * 100);
+    return 0;
+}
+
+int HTTPD::sendWebsocket (int id, const char *buf, int len, const char *mask) {
+    HTTPD *httpd = HTTPD::getInstance();
+    int i = 0, r;
+    char tmp[10];
+
+    tmp[i++] = 0x81; // single, text frame
+    if (len < 126) {
+        tmp[i++] = (mask == NULL ? 0 : 0x80) | len;
+    } else {
+        tmp[i++] = (mask == NULL ? 0 : 0x80) | 126;
+        tmp[i++] = (len >> 8) & 0xff;
+        tmp[i++] = len & 0xff;
+    }
+    if (mask) {
+        memcpy(&tmp[i], mask, 4);
+        i += 4;
+    }
+    r = httpd->_state[id].client->send_all(tmp, i);
+
+    if (r >= 0) {
+        if (mask) {
+            char tmp2[len];
+            for (i = 0; i < len; i ++) {
+                tmp2[i] = buf[i] ^ mask[i & 0x03];
+            }
+            r = httpd->_state[id].client->send_all(tmp2, len);
+        } else {
+            r = httpd->_state[id].client->send_all((char*)buf, len);
+        }
+    }
+    return r;
+}
+
+