Apple

On Apr 13, 2015, at 10:12 AM, Jeff Johnson <email@hidden> wrote:

I want the host and port is to send a "Host" header. I might be able to get away without it, but I'd prefer to adhere to standards.

I ended up having to implement this earlier today; here’s the code I came up with. “_inputStream” is an NSInputStream opened on a TCP socket. Disclaimer: I haven’t tested it much yet, and not at all with IPv6 addresses.

- (NSString*) remoteHost {

    // First recover the socket handle from the stream:

    NSData* handleData = CFBridgingRelease(CFReadStreamCopyProperty(

                                                  (__bridge CFReadStreamRef)_inputStream,

                                                  kCFStreamPropertySocketNativeHandle));

    if (!handleData || handleData.length != sizeof(CFSocketNativeHandle))

        return nil;

    CFSocketNativeHandle socketHandle = *(const CFSocketNativeHandle*)handleData.bytes;

    // Get the remote/peer address in binary form:

    struct sockaddr_in addr;

    unsigned addrLen = sizeof(addr);

    if (getpeername(socketHandle, (struct sockaddr*)&addr,&addrLen) < 0)

        return nil;

    // Format it in readable (e.g. dotted-quad) form, with the port number:

    char nameBuf[INET6_ADDRSTRLEN];

    if (inet_ntop(addr.sin_family, &addr.sin_addr, nameBuf, (socklen_t)sizeof(nameBuf)) == NULL)

        return nil;

    return [NSString stringWithFormat: @"%s:%hu", nameBuf, ntohs(addr.sin_port)];

}