SSL shutdown for rtmps.

While rtmp module does not support SSL, starting from nginx 1.25.5 an SSL
connection can be passed from nginx stream pass module.  Such connections
should be shut down on connection closure.

An rtmps example:

rtmp {
    server {
        listen 1935; # rtmp
        application foo {
            live on;
        }
    }
}

stream {
    server {
        listen 1936 ssl; # rtmps
        ssl_certificate example.com.crt;
        ssl_certificate_key example.com.key;
        pass 127.0.0.1:1935;
    }
}

Author: arut

ngx_rtmp_init.c

@@ -258,6 +258,17 @@ ngx_rtmp_close_connection(ngx_connection_t *c)
 
     ngx_log_debug0(NGX_LOG_DEBUG_RTMP, c->log, 0, "close connection");
 
+#if (NGX_SSL)
+
+    if (c->ssl) {
+        if (ngx_ssl_shutdown(c) == NGX_AGAIN) {
+            c->ssl->handler = ngx_rtmp_close_connection;
+            return;
+        }
+    }
+
+#endif
+
 #if (NGX_STAT_STUB)
     (void) ngx_atomic_fetch_add(ngx_stat_active, -1);
 #endif