TUN-7259: Add warning for missing ingress rules

Providing no ingress rules in the configuration file or via the CLI will now provide a warning and return 502 for all incoming HTTP requests.

component-tests/test_tunnel.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+import requests
+from conftest import CfdModes
+from constants import METRICS_PORT, MAX_RETRIES, BACKOFF_SECS
+from retrying import retry
+from util import LOGGER, start_cloudflared, wait_tunnel_ready, send_requests
+
+class TestTunnel:
+    '''Test tunnels with no ingress rules from config.yaml but ingress rules from CLI only'''
+
+    def test_tunnel_hello_world(self, tmp_path, component_tests_config):
+        config = component_tests_config(cfd_mode=CfdModes.NAMED, run_proxy_dns=False, provide_ingress=False)
+        LOGGER.debug(config)
+        with start_cloudflared(tmp_path, config, cfd_args=["run", "--hello-world"], new_process=True):
+            wait_tunnel_ready(tunnel_url=config.get_url(),
+                              require_min_connections=4)
+    
+    def test_tunnel_url(self, tmp_path, component_tests_config):
+        config = component_tests_config(cfd_mode=CfdModes.NAMED, run_proxy_dns=False, provide_ingress=False)
+        LOGGER.debug(config)
+        with start_cloudflared(tmp_path, config, cfd_args=["run", "--url", f"http://localhost:{METRICS_PORT}/"], new_process=True):
+            wait_tunnel_ready(require_min_connections=4)
+            send_requests(config.get_url()+"/ready", 3, True)
+
+    def test_tunnel_no_ingress(self, tmp_path, component_tests_config):
+        '''
+        Running a tunnel with no ingress rules provided from either config.yaml or CLI will still work but return 502
+        for all incoming requests.
+        '''
+        config = component_tests_config(cfd_mode=CfdModes.NAMED, run_proxy_dns=False, provide_ingress=False)
+        LOGGER.debug(config)
+        with start_cloudflared(tmp_path, config, cfd_args=["run"], new_process=True):
+            wait_tunnel_ready(require_min_connections=4)
+            resp = send_request(config.get_url()+"/")
+            assert resp.status_code == 502, "Expected cloudflared to return 502 for all requests with no ingress defined"
+            resp = send_request(config.get_url()+"/test")
+            assert resp.status_code == 502, "Expected cloudflared to return 502 for all requests with no ingress defined"
+
+
+@retry(stop_max_attempt_number=MAX_RETRIES, wait_fixed=BACKOFF_SECS * 1000)
+def send_request(url):
+    with requests.Session() as s:
+        return s.get(url, timeout=BACKOFF_SECS)