set is_tls at mg_listen and mg_connect level

src/sock.c

@@ -361,6 +361,7 @@ static void connect_conn(struct mg_connection *c) {
     mg_call(c, MG_EV_CONNECT, NULL);
     MG_EPOLL_MOD(c, 0);
     if (c->is_tls_hs) mg_tls_handshake(c);
+    if (!c->is_tls_hs) c->is_tls = 0; // user did not call mg_tls_init()
   } else {
     mg_error(c, "socket error");
   }
@@ -413,6 +414,7 @@ void mg_connect_resolved(struct mg_connection *c) {
     if (rc == 0) {                       // Success
       setlocaddr(FD(c), &c->loc);
       mg_call(c, MG_EV_CONNECT, NULL);  // Send MG_EV_CONNECT to the user
+      if (!c->is_tls_hs) c->is_tls = 0; // user did not call mg_tls_init()
     } else if (MG_SOCK_PENDING(rc)) {   // Need to wait for TCP handshake
       MG_DEBUG(("%lu %ld -> %M pend", c->id, c->fd, mg_print_ip_port, &c->rem));
       c->is_connecting = 1;
@@ -468,10 +470,12 @@ static void accept_conn(struct mg_mgr *mgr, struct mg_connection *lsn) {
     c->pfn_data = lsn->pfn_data;
     c->fn = lsn->fn;
     c->fn_data = lsn->fn_data;
+    c->is_tls = lsn->is_tls;
     MG_DEBUG(("%lu %ld accepted %M -> %M", c->id, c->fd, mg_print_ip_port,
               &c->rem, mg_print_ip_port, &c->loc));
     mg_call(c, MG_EV_OPEN, NULL);
     mg_call(c, MG_EV_ACCEPT, NULL);
+    if (!c->is_tls_hs) c->is_tls = 0; // user did not call mg_tls_init()
   }
 }