Help understand SocketIO

cocos2d-x
1

Hi, I have made a server using netty and a java client (it works).
Now I’d like to make a connection with SocketIO copying from ccp tests (cocos 3.8.1) but I have this result:

SIOClientImpl::handshake() failed
error buffer: The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.
SocketIOTest::onError received: The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.

the only thing I have written is:

SIOClient *sio = SocketIO::connect(*this, "ws://localhost:8992");
sio->send("Hello Socket.IO");

Should I implement something particular in server side?
any help is appreciated
thanks

2

As the result indicates:

the App Transport Security policy requires the use of a secure connection

So, a secure connection is required, using wss instead of ws to resolve this issue.

3

Why is a secure connection required?

4

Hi I have tryed with:

wss://localhost:8992
localhost:8992
http://localhost:8992

always gives me the same error

5

Does the server support wss? If you want to use wss to access the server, the server is required to configure with SSL support.

Does the client support wss? I don’t know whether the ssl is support by SocketIO in cocos2d-x, as I know, libwebsockets in cocos2d-x isn’t compiled with ssl support, please check this issue.

6

thanks for response. I have tryed with supporting ssl and not.
It is a game server that listen for connection
I can connect with this code in plain c without problems and I receive the message from server “Hello!”:

int sockfd, portno, n;
    struct sockaddr_in serv_addr;
    struct hostent *server;
    
    char buffer[1024];
    portno = 8992;
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0)
        perror("ERROR opening socket");
    server = gethostbyname("localhost");
    if (server == NULL) {
        fprintf(stderr,"ERROR, no such host\n");
        exit(0);
    }
    bzero((char *) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr,
          (char *)&serv_addr.sin_addr.s_addr,
          server->h_length);
    serv_addr.sin_port = htons(portno);
    if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
        perror("ERROR connecting");
    /*
     printf("Please enter the message: ");
     bzero(buffer,256);
     fgets(buffer,255,stdin);
     n = write(sockfd,buffer,strlen(buffer));
     if (n < 0)
     perror("ERROR writing to socket");
     */
    while (true) {
        bzero(buffer,1024);
        n = read(sockfd,buffer,1024);
        if (n < 0)
            perror("ERROR reading from socket");
        printf("leggo: %s\n",buffer);
        if (buffer[0]=='{') {
            rapidjson::Document document;
            document.Parse<0>(buffer);
            const char *tipo = document["type"].GetString();
            printf("**** %s *****",tipo);
            
        }
    }
    close(sockfd);
7

Please refer to ios - The resource could not be loaded because the App Transport Security policy requires the use of a secure connection - Stack Overflow.

It’s an iOS 9 specific issue. Hope this helps you.

8

Good question. Maybe it’s about iOS 9.

9

You have to use a SocketIO implementation, which supports >= TLS 1.2, as this is the minimum required version for iOS with ATS enabled by default.

This has one reason. iOS 9 uses App Transport Security (ATS) as default, and because of 1. and 2. you get this error:

  1. cocos2d-x client does not support SSL or TLS
  2. cocos2d-x dropped the usage of curl in favor of the platform functions

See this link to allow unsecured connections, which is something you should NEVER do:

1 Like
10

I have tryed to disable ssl using plist:

<key>NSAppTransportSecurity</key>
<dict>
  <!--Include to allow all connections (DANGER)-->
  <key>NSAllowsArbitraryLoads</key>
      <true/>
</dict>

but I have received this error now:

In the constructor of HttpClient!
2015-12-18 19:58:03.531 PPA-mobile[3356:105281] Starting to load http://localhost:8992/socket.io/1/?EIO=2&transport=polling&b64=true
SIOClientImpl::handshake() failed
error buffer: The network connection was lost.
SocketIOTest::onError received: The network connection was lost.

So I can not use SocketIO for now right?
Can I use some other library?
Or where should I modify SocketIO to reflect iOS9 ATS?
thanks

11

The SocketIO client is using WebSockets internally only. You cannot use a transport other than that.

Beats me. I don’t use SocketIO so I don’t know of any except Socket.IO C++ | Socket.IO.
It’s based on Boost and WebSocket++(which supports TLS).

You would have to adopt the SocketIO client and the WebSocket client, as it is used internally. cocos2d-x uses libwebsocket, which is not compiled with TLS support. There are third party WebSocket libs out there, which can be used on it’s own or have to be integrated into the client implementations of cocos2d-x.

12

thank you, I’ll try…
it seems that the server MUST be their kind of server Node.js
am I right?

https://github.com/socketio/socket.io-client-cpp
void OnMessage(sio::event &)
{

}
h.socket()->on("new message", &OnMessage)

I’m not able to find anything that send some bytes.

Should I rewrite the server I have already written to extend Node.js?
thanks

13

It’s compatible with the socket.io 1.0+ protocol. So every server implementing it should work.

The code you posted is just an event handler. There are various message types for sending different data types like integer, double, strings,…

Scroll to the end:

If it’s already supporting the socket.io 1.0+ protocol, then there is no need in that. Socket.io and WebSockets are just protocols.