Listen Callback Provides a Stream ID without Length. Can't Properly Handle NULL Characters.

[maxsharabayko]

The listen callback function (srt_listen_callback_fn) expects the following prototype:

int f(void* opaq, SRTSOCKET ns, int hsversion, const struct sockaddr* peeraddr, const char* streamid)

The SRTO_STREAMID is not yet set on a socket, hence it is provided via the streamid argument. However no notion of length is provided, meaning there is no safe way to properly handle StreamID values with NUL characters.

See related issue #2284 for get/set socket option.

Rework the function prototype to provide the length of the streamID sequence of chars.

Note other related FRs:

• [FR] A callback for rejected connection attempts on a listener.  #2621
• [FR] Listener callback: provide group ID #2728