Check that user has supplied at least one URL argument to quic_client

net/tools/quic/quic_client_bin.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A binary wrapper for QuicClient.  Connects to --hostname via --address
 // on --port and requests URLs specified on the command line.
 // Pass --secure to check the certificates using proof verifier.
 // Pass --initial_stream_flow_control_window to specify the size of the initial
 // stream flow control receive window to advertise to server.
 // Pass --initial_session_flow_control_window to specify the size of the initial
@@ skipping 26 matching lines @@
 int32 FLAGS_initial_stream_flow_control_window = 100 * net::kMaxPacketSize;
 // Size of the initial session flow control receive window to advertise to
 // server.
 int32 FLAGS_initial_session_flow_control_window = 200 * net::kMaxPacketSize;
 // Check the certificates using proof verifier.
 bool FLAGS_secure = false;
 
 int main(int argc, char *argv[]) {
   base::CommandLine::Init(argc, argv);
   base::CommandLine* line = base::CommandLine::ForCurrentProcess();
+  const base::CommandLine::StringVector& urls = line->GetArgs();
 
   logging::LoggingSettings settings;
   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
   CHECK(logging::InitLogging(settings));
 
-  if (line->HasSwitch("h") || line->HasSwitch("help")) {
+  if (line->HasSwitch("h") || line->HasSwitch("help") || urls.empty()) {
     const char* help_str =
-        "Usage: quic_client [options]\n"
+        "Usage: quic_client [options] <url> ...\n"
         "\n"
+        "At least one <url> with scheme must be provided "
+        "(e.g. http://www.google.com/)\n\n"
         "Options:\n"
         "-h, --help                  show this help message and exit\n"
         "--port=<port>               specify the port to connect to\n"
         "--address=<address>         specify the IP address to connect to\n"
         "--host=<host>               specify the SNI hostname to use\n"
         "--secure                    check certificates\n";
     std::cout << help_str;
     exit(0);
   }
   if (line->HasSwitch("port")) {
@@ skipping 35 matching lines @@
   net::tools::QuicClient client(
       net::IPEndPoint(addr, FLAGS_port),
       net::QuicServerId(FLAGS_hostname, FLAGS_port, FLAGS_secure,
                         net::PRIVACY_MODE_DISABLED),
       net::QuicSupportedVersions(), true, config, &epoll_server);
 
   client.Initialize();
 
   if (!client.Connect()) return 1;
 
-  client.SendRequestsAndWaitForResponse(line->GetArgs());
+  client.SendRequestsAndWaitForResponse(urls);
   return 0;
 }