text: /*
   *
   * Copyright 2015, Google Inc.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   */
  
  #include "src/core/iomgr/socket_utils_posix.h"
  #include <grpc/grpc.h>
  #include <grpc/support/alloc.h>
  #include <grpc/support/host_port.h>
  #include <grpc/support/log.h>
  #include "test/core/end2end/cq_verifier.h"
  #include "test/core/util/port.h"
  #include "test/core/util/test_config.h"
  
  /* This test exercises IPv4, IPv6, and dualstack sockets in various ways. */
  
  static void *tag(gpr_intptr i) { return (void *)i; }
  
  static gpr_timespec ms_from_now(int ms) {
    return GRPC_TIMEOUT_MILLIS_TO_DEADLINE(ms);
  }
  
  static void drain_cq(grpc_completion_queue *cq) {
    grpc_event *ev;
    grpc_completion_type type;
    do {
      ev = grpc_completion_queue_next(cq, ms_from_now(5000));
      GPR_ASSERT(ev);
      type = ev->type;
      grpc_event_finish(ev);
      gpr_log(GPR_INFO, "Drained event type %d", type);
    } while (type != GRPC_QUEUE_SHUTDOWN);
  }
  
  void test_connect(const char *server_host, const char *client_host, int port,
                    int expect_ok) {
    char *client_hostport;
    char *server_hostport;
    grpc_channel *client;
    grpc_server *server;
    grpc_completion_queue *client_cq;
    grpc_completion_queue *server_cq;
    grpc_call *c;
    grpc_call *s;
    cq_verifier *v_client;
    cq_verifier *v_server;
    gpr_timespec deadline;
    int got_port;
  
    if (port == 0) {
      port = grpc_pick_unused_port_or_die();
    }
  
    gpr_join_host_port(&server_hostport, server_host, port);
  
    /* Create server. */
    server_cq = grpc_completion_queue_create();
    server = grpc_server_create(server_cq, NULL);
    GPR_ASSERT((got_port = grpc_server_add_http2_port(server, server_hostport)) >
               0);
    if (port == 0) {
      port = got_port;
    } else {
      GPR_ASSERT(port == got_port);
    }
    grpc_server_start(server);
    v_server = cq_verifier_create(server_cq);
  
    /* Create client. */
    gpr_join_host_port(&client_hostport, client_host, port);
    client_cq = grpc_completion_queue_create();
    client = grpc_channel_create(client_hostport, NULL);
    v_client = cq_verifier_create(client_cq);
  
    gpr_log(GPR_INFO, "Testing with server=%s client=%s (expecting %s)",
            server_hostport, client_hostport, expect_ok ? "success" : "failure");
  
    gpr_free(client_hostport);
    gpr_free(server_hostport);
  
    if (expect_ok) {
      /* Normal deadline, shouldn't be reached. */
      deadline = ms_from_now(60000);
    } else {
      /* Give up faster when failure is expected.
         BUG: Setting this to 1000 reveals a memory leak (b/18608927). */
      deadline = ms_from_now(1500);
    }
  
    /* Send a trivial request. */
    c = grpc_channel_create_call_old(client, "/foo", "foo.test.google.fr",
                                     deadline);
    GPR_ASSERT(c);
  
    GPR_ASSERT(GRPC_CALL_OK ==
               grpc_call_invoke_old(c, client_cq, tag(2), tag(3), 0));
    GPR_ASSERT(GRPC_CALL_OK == grpc_call_writes_done_old(c, tag(4)));
    if (expect_ok) {
      /* Check for a successful request. */
      cq_expect_finish_accepted(v_client, tag(4), GRPC_OP_OK);
      cq_verify(v_client);
  
      GPR_ASSERT(GRPC_CALL_OK == grpc_server_request_call_old(server, tag(100)));
      cq_expect_server_rpc_new(v_server, &s, tag(100), "/foo",
                               "foo.test.google.fr", deadline, NULL);
      cq_verify(v_server);
  
      GPR_ASSERT(GRPC_CALL_OK ==
                 grpc_call_server_accept_old(s, server_cq, tag(102)));
      GPR_ASSERT(GRPC_CALL_OK == grpc_call_server_end_initial_metadata_old(s, 0));
      cq_expect_client_metadata_read(v_client, tag(2), NULL);
      cq_verify(v_client);
  
      GPR_ASSERT(GRPC_CALL_OK ==
                 grpc_call_start_write_status_old(s, GRPC_STATUS_UNIMPLEMENTED,
                                                  "xyz", tag(5)));
      cq_expect_finished_with_status(v_client, tag(3), GRPC_STATUS_UNIMPLEMENTED,
                                     "xyz", NULL);
      cq_verify(v_client);
  
      cq_expect_finish_accepted(v_server, tag(5), GRPC_OP_OK);
      cq_expect_finished(v_server, tag(102), NULL);
      cq_verify(v_server);
  
      grpc_call_destroy(c);
      grpc_call_destroy(s);
    } else {
      /* Check for a failed connection. */
      cq_expect_client_metadata_read(v_client, tag(2), NULL);
      cq_expect_finished_with_status(v_client, tag(3),
                                     GRPC_STATUS_DEADLINE_EXCEEDED,
                                     "Deadline Exceeded", NULL);
      cq_expect_finish_accepted(v_client, tag(4), GRPC_OP_ERROR);
      cq_verify(v_client);
  
      grpc_call_destroy(c);
    }
  
    cq_verifier_destroy(v_client);
    cq_verifier_destroy(v_server);
  
    /* Destroy client. */
    grpc_channel_destroy(client);
    grpc_completion_queue_shutdown(client_cq);
    drain_cq(client_cq);
    grpc_completion_queue_destroy(client_cq);
  
    /* Destroy server. */
    grpc_server_shutdown(server);
    grpc_server_destroy(server);
    grpc_completion_queue_shutdown(server_cq);
    drain_cq(server_cq);
    grpc_completion_queue_destroy(server_cq);
  }
  
  int main(int argc, char **argv) {
    int do_ipv6 = 1;
  
    grpc_test_init(argc, argv);
    grpc_init();
  
    if (!grpc_ipv6_loopback_available()) {
      gpr_log(GPR_INFO, "Can't bind to ::1.  Skipping IPv6 tests.");
      do_ipv6 = 0;
    }
  
      /* For coverage, test with and without dualstack sockets. */
    for (grpc_forbid_dualstack_sockets_for_testing = 0;
         grpc_forbid_dualstack_sockets_for_testing <= 1;
         grpc_forbid_dualstack_sockets_for_testing++) {
      /* :: and 0.0.0.0 are handled identically. */
      test_connect("::", "127.0.0.1", 0, 1);
      test_connect("::", "::ffff:127.0.0.1", 0, 1);
      test_connect("::", "localhost", 0, 1);
      test_connect("0.0.0.0", "127.0.0.1", 0, 1);
      test_connect("0.0.0.0", "::ffff:127.0.0.1", 0, 1);
      test_connect("0.0.0.0", "localhost", 0, 1);
      if (do_ipv6) {
        test_connect("::", "::1", 0, 1);
        test_connect("0.0.0.0", "::1", 0, 1);
      }
  
      /* These only work when the families agree. */
      test_connect("127.0.0.1", "127.0.0.1", 0, 1);
      if (do_ipv6) {
        test_connect("::1", "::1", 0, 1);
        test_connect("::1", "127.0.0.1", 0, 0);
        test_connect("127.0.0.1", "::1", 0, 0);
      }
    }
  
    grpc_shutdown();
  
    return 0;
  }
  