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TCPServer.cpp
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TCPServer.cpp
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#include "TCPServer.h"
#include "Array.h"
#include "Misc.h"
#include "DataStream.h"
#include <SAL/Cryptography.h>
#define WS_HEADER_LINES 25
#define WS_MASK_BYTES 4
#define WS_CLOSE_OPCODE 0x8
#define WS_BINARY_OPCODE 0x2
#define WS_PONG_OPCODE 0xA
#define WS_PING_OPCODE 0x9
#define WS_TEXT_OPCODE 0x1
#define WS_CONTINUATION_OPCODE 0x0
static void TCPServer_WebSocket_DoHandshake(TCPServer_Client* client, SAL_Socket* socket);
static void TCPServer_WebSocket_OnReceive(TCPServer_Client* client, SAL_Socket* socket);
static boolean TCPServer_WebSocket_Send(TCPServer_Client* client, uint8* data, uint16 length, uint8 opCode);
static void TCPServer_WebSocket_Close(TCPServer_Client* client, uint16 code);
static void TCPServer_WebSocket_DoHandshake(TCPServer_Client* client, SAL_Socket* socket) {
int32 i;
int32 lastOffset;
int32 nextHeaderLine;
Array* headerLines[WS_HEADER_LINES];
Array* keyAndMagic;
DataStream* response;
uint8* hash;
int8* base64;
uint32 base64Length;
client->BytesReceived = SAL_Socket_Read(socket, client->Buffer + client->BytesReceived, MESSAGE_MAXSIZE - client->BytesReceived);
if (client->BytesReceived == 0) {
client->Server->DisconnectCallback(client, client->State);
TCPServer_DisconnectClient(client);
return;
}
for (i = 0, lastOffset = 0, nextHeaderLine = 0; i < client->BytesReceived && nextHeaderLine < WS_HEADER_LINES; i++) {
if (client->Buffer[i] == 13 && client->Buffer[i + 1] == 10) {
headerLines[nextHeaderLine] = Array_NewFromExisting(client->Buffer + lastOffset, i - lastOffset);
nextHeaderLine++;
lastOffset = i + 2;
}
}
keyAndMagic = Array_New(60);
for (i = 0; i < nextHeaderLine; i++)
if (headerLines[i] != NULL)
if (headerLines[i]->Size >= 17 && Memory_Compare((uint8*)"Sec-WebSocket-Key", headerLines[i]->Data, 17, 17))
keyAndMagic = Array_NewFromExisting(headerLines[i]->Data + 19, 24);
Array_Write(keyAndMagic, (uint8*)"258EAFA5-E914-47DA-95CA-C5AB0DC85B11", 24, 36);
hash = SAL_Cryptography_SHA1(keyAndMagic->Data, 60);
Base64Encode(hash, 20, &base64, &base64Length);
response = DataStream_New(97 + 4 + base64Length);
DataStream_WriteBytes(response, (uint8*)"HTTP/1.1 101 Switching Protocols\r\nUpgrade: WebSocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: ", 97, false);
DataStream_WriteBytes(response, (uint8*)base64, base64Length, false);
DataStream_WriteBytes(response, (uint8*)"\r\n\r\n", 4, false);
if (SAL_Socket_EnsureWrite(client->Socket, response->Data.Data, 97 + 4 + base64Length, 10) != 97 + 4 + base64Length) {
TCPServer_DisconnectClient(client);
return;
}
client->WebSocketReady = true;
client->BytesReceived = 0;
DataStream_Free(response);
Array_Free(keyAndMagic);
Free(base64);
Free(hash);
for (i = 0; i < nextHeaderLine; i++)
if (headerLines[i] != NULL)
Array_Free(headerLines[i]);
}
static void TCPServer_WebSocket_OnReceive(TCPServer_Client* client, SAL_Socket* socket) {
uint8 bytes[2];
uint8 FIN;
uint8 RSV1;
uint8 RSV2;
uint8 RSV3;
uint16 opCode;
uint8 mask;
uint16 length;
uint32 i;
uint32 received;
uint8 headerEnd;
uint8 maskBuffer[WS_MASK_BYTES];
uint8* payloadBuffer;
uint8* dataBuffer; //used for websocket's framing. The unmasked data from the current frame is copied to the start of Client.Buffer. Client.MessageLength is then used to point to the end of the data copied to the start of Client.Buffer.
if (client->WebSocketReady == false) {
TCPServer_WebSocket_DoHandshake(client, socket);
return;
}
dataBuffer = client->Buffer + client->MessageLength;
received = SAL_Socket_Read(client->Socket, dataBuffer + client->BytesReceived, MESSAGE_MAXSIZE - client->BytesReceived - client->MessageLength);
client->BytesReceived += received;
if (client->BytesReceived == 0) {
client->Server->DisconnectCallback(client, client->State);
TCPServer_DisconnectClient(client);
return;
}
while (client->BytesReceived > 0) {
if (client->BytesReceived >= 2) {
bytes[0] = dataBuffer[0];
bytes[1] = dataBuffer[1];
headerEnd = 2;
FIN = bytes[0] >> 7 & 0x1;
RSV1 = bytes[0] >> 6 & 0x1;
RSV2 = bytes[0] >> 5 & 0x1;
RSV3 = bytes[0] >> 4 & 0x1;
opCode = bytes[0] & 0xF;
mask = bytes[1] >> 7 & 0x1;
length = bytes[1] & 0x7F;
if (mask == false || RSV1 || RSV2 || RSV3) {
TCPServer_WebSocket_Close(client, 1002);
return;
}
if (length == 126) {
if (client->BytesReceived < 4)
return;
length = SAL_Socket_NetworkToHostShort((uint16)*dataBuffer + 2);
headerEnd += 2;
}
else if (length == 127) { //we don't support messages this big
TCPServer_WebSocket_Close(client, 1009);
return;
}
switch (opCode) { //ping is handled by the application, not websocket
case WS_TEXT_OPCODE:
TCPServer_WebSocket_Close(client, 1003);
return;
case WS_CLOSE_OPCODE:
TCPServer_WebSocket_Close(client, 1000);
return;
case WS_PONG_OPCODE:
headerEnd += mask ? WS_MASK_BYTES : 0;
client->BytesReceived -= headerEnd;
dataBuffer = client->Buffer + headerEnd;
continue;
case WS_PING_OPCODE:
if (length <= 125) {
bytes[0] = 128 | WS_PONG_OPCODE;
if (SAL_Socket_EnsureWrite(client->Socket, bytes, 2, 10) != 2 || SAL_Socket_EnsureWrite(client->Socket, dataBuffer + headerEnd, length + 4, 10) != length + 4) {
TCPServer_DisconnectClient(client);
return;
}
headerEnd += mask ? WS_MASK_BYTES : 0;
client->BytesReceived -= headerEnd;
dataBuffer = client->Buffer + headerEnd;
continue;
}
else {
TCPServer_WebSocket_Close(client, 1009);
return;
}
case WS_CONTINUATION_OPCODE:
case WS_BINARY_OPCODE:
Memory_BlockCopy(dataBuffer + headerEnd, maskBuffer, WS_MASK_BYTES);
headerEnd += WS_MASK_BYTES;
payloadBuffer = dataBuffer + headerEnd;
client->BytesReceived -= length + headerEnd;
for (i = 0; i < length; i++)
dataBuffer[i] = payloadBuffer[i] ^ maskBuffer[i % WS_MASK_BYTES];
if (FIN) {
if (*(uint16*)client->Buffer == client->MessageLength + length - MESSAGE_LENGTHBYTES) {
client->Server->ReceiveCallback(client, client->State, client->Buffer + MESSAGE_LENGTHBYTES, client->MessageLength + length - MESSAGE_LENGTHBYTES);
}
Memory_BlockCopy(client->Buffer + length + headerEnd, client->Buffer, client->BytesReceived);
dataBuffer = client->Buffer;
client->MessageLength = 0;
}
else {
client->MessageLength += length;
dataBuffer = client->Buffer + client->MessageLength;
Memory_BlockCopy(payloadBuffer + length, dataBuffer, client->BytesReceived);
}
continue;
default:
TCPServer_WebSocket_Close(client, 1002);
return;
}
}
}
}
static boolean TCPServer_WebSocket_Send(TCPServer_Client* client, uint8* data, uint16 length, uint8 opCode) {
uint8 bytes[4];
uint8 sendLength;
bytes[0] = 128 | opCode;
sendLength = 2;
if (length <= 125) {
bytes[1] = (uint8)length;
*(uint16*)(bytes + 2) = 0;
}
else if (length <= 65536) {
bytes[1] = 126;
sendLength += 2;
*(uint16*)(bytes + 2) = SAL_Socket_HostToNetworkShort(length);
}
else { /* we dont support longer messages */
TCPServer_WebSocket_Close(client, 1004);
return false;
}
if (SAL_Socket_EnsureWrite(client->Socket, bytes, sendLength, 10) != sendLength)
goto sendFailed;
if (SAL_Socket_EnsureWrite(client->Socket, data, length, 10) != length)
goto sendFailed;
return true;
sendFailed:
client->WebSocketCloseSent = true;
TCPServer_DisconnectClient(client);
return false;
}
static void TCPServer_WebSocket_Close(TCPServer_Client* client, uint16 code) {
client->WebSocketCloseSent = true;
TCPServer_WebSocket_Send(client, (uint8*)&code, sizeof(uint16), WS_CLOSE_OPCODE);
if (client->Server->IsWebSocket)
TCPServer_DisconnectClient(client);
}
static void TCPServer_ClientSocketReadCallback(SAL_Socket* socket, void* state) {
TCPServer* server;
TCPServer_Client* client;
uint32 received;
uint32 excess;
uint32 messageLength;
client = (TCPServer_Client*)state;
server = client->Server;
if (server->IsWebSocket) {
TCPServer_WebSocket_OnReceive(client, socket);
return;
}
received = SAL_Socket_Read(socket, client->Buffer + client->BytesReceived, MESSAGE_MAXSIZE - client->BytesReceived);
client->BytesReceived += received;
if (received == 0) {
TCPServer_DisconnectClient(client);
return;
}
if (received > MESSAGE_LENGTHBYTES) {
messageLength = *(uint16*)client->Buffer;
excess = received - MESSAGE_LENGTHBYTES - messageLength;
while (excess >= 0 && messageLength != 0) {
server->ReceiveCallback(client, client->State, client->Buffer + MESSAGE_LENGTHBYTES, messageLength);
if (excess > 0) {
Memory_BlockCopy(client->Buffer + client->BytesReceived - excess, client->Buffer, excess);
client->BytesReceived = excess;
if (excess > MESSAGE_LENGTHBYTES) {
messageLength = *(uint16*)client->Buffer;
excess -= MESSAGE_LENGTHBYTES + messageLength;
}
else {
messageLength = 0;
}
}
else {
client->BytesReceived = 0;
messageLength = 0;
}
}
if (messageLength == 0)
client->BytesReceived = 0;
}
}
static SAL_Thread_Start(TCPServer_AcceptWorkerRun) {
TCPServer* server;
SAL_Socket* acceptedSocket;
TCPServer_Client* newClient;
server = (TCPServer*)startupArgument;
server->Active = true;
while (server->Active) {
acceptedSocket = SAL_Socket_Accept(server->Listener);
if (acceptedSocket) {
newClient = Allocate(TCPServer_Client);
newClient->Server = server;
newClient->State = server->ConnectCallback(newClient, acceptedSocket->RemoteEndpointAddress);
newClient->Socket = acceptedSocket;
newClient->BytesReceived = 0;
newClient->MessageLength = 0;
newClient->WebSocketReady = false;
newClient->WebSocketCloseSent = false;
AsyncLinkedList_Append(&server->ClientList, newClient);
SAL_Socket_SetReadCallback(acceptedSocket, TCPServer_ClientSocketReadCallback, newClient);
}
}
return 0;
}
TCPServer* TCPServer_Listen(int8* port, boolean isWebSocket, TCPServer_OnConnect connectCallback, TCPServer_OnReceive receiveCallback, TCPServer_OnDisconnect disconnectCallback) {
TCPServer* server;
server = Allocate(TCPServer);
server->IsWebSocket = isWebSocket;
server->ReceiveCallback = receiveCallback;
server->DisconnectCallback = disconnectCallback;
server->ConnectCallback = connectCallback;
server->Active = false;
server->Listener = SAL_Socket_Listen(port, SAL_Socket_Families_IPAny, SAL_Socket_Types_TCP);
if (server->Listener) {
AsyncLinkedList_Initialize(&server->ClientList, NULL);
server->AcceptWorker = SAL_Thread_Create(TCPServer_AcceptWorkerRun, server);
}
else {
Free(server);
server = NULL;
}
return server;
}
boolean TCPServer_Send(TCPServer_Client* client, uint8* buffer, uint16 length) {
assert(client != NULL);
assert(client->Server != NULL);
if (client->Server->Active) {
if (client->Server->IsWebSocket) {
return TCPServer_WebSocket_Send(client, buffer, length, WS_BINARY_OPCODE);
}
else {
if ( SAL_Socket_EnsureWrite(client->Socket, buffer, length, 10) != length) {
TCPServer_DisconnectClient(client);
return false;
}
}
}
return true;
}
void TCPServer_DisconnectClient(TCPServer_Client* client) {
assert(client != NULL);
assert(client->Server != NULL);
if (!client->WebSocketCloseSent)
TCPServer_WebSocket_Close(client, 1001);
client->Server->DisconnectCallback(client, client->State);
SAL_Socket_Close(client->Socket);
AsyncLinkedList_Remove(&client->Server->ClientList, client);
Free(client);
}
void TCPServer_Shutdown(TCPServer* server) {
TCPServer_Client* client;
assert(server != NULL);
assert(server->Active == true);
server->Active = false;
server->IsWebSocket = false;
server->ReceiveCallback = NULL;
server->DisconnectCallback = NULL;
server->ConnectCallback = NULL;
AsyncLinkedList_ForEach(client, &server->ClientList, TCPServer_Client*) {
TCPServer_DisconnectClient(client);
}
SAL_Socket_Close(server->Listener);
SAL_Thread_Join(server->AcceptWorker);
AsyncLinkedList_Uninitialize(&server->ClientList);
Free(server);
}