client: iterate connection attempts through addrinfo list

lib/core-net/private-lib-core-net.h

@@ -751,6 +751,7 @@ struct lws {
 #endif
 #if defined(LWS_WITH_CLIENT)
 	char chunk_parser; /* enum lws_chunk_parser */
+	uint8_t addrinfo_idx;
 #endif
 #if defined(LWS_WITH_CGI) || defined(LWS_WITH_CLIENT)
 	char reason_bf; /* internal writeable callback reason bitfield */

lib/roles/http/client/client-handshake.c

@@ -260,6 +260,7 @@ lws_client_connect_3_connect(struct lws *wsi, const char *ads,
 #endif
 #endif
 
+
 	/*
 	 * async dns calls back here for everybody who cares when it gets a
 	 * result... but if we are piggybacking, we do not want to connect
@@ -554,6 +555,7 @@ ads_known:
 	m = connect(wsi->desc.sockfd, (const struct sockaddr *)psa, n);
 	if (m == -1) {
 
+
 		lwsl_debug("%s: connect says errno: %d\n", __func__, LWS_ERRNO);
 
 		if (LWS_ERRNO != LWS_EALREADY &&
@@ -597,7 +599,6 @@ conn_good:
 
 	return lws_client_connect_4_established(wsi, NULL, plen);
 
-
 oom4:
 	if (lwsi_role_client(wsi) && wsi->protocol /* && lwsi_state_est(wsi) */)
 		lws_inform_client_conn_fail(wsi,(void *)cce, strlen(cce));
@@ -623,6 +624,7 @@ oom4:
 
 	return NULL;
 
+
 try_next_result_fds:
 	wsi->oom4 = 0;
 	__remove_wsi_socket_from_fds(wsi);
@@ -763,6 +765,8 @@ lws_client_connect_2_dnsreq(struct lws *wsi)
 create_new_conn:
 #endif
 
+	wsi->addrinfo_idx = 0;
+
 	/*
 	 * clients who will create their own fresh connection keep a copy of
 	 * the hostname they originally connected to, in case other connections