/* Copyright libuv project and contributors. All rights reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to

 * deal in the Software without restriction, including without limitation the

 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 */

#include "uv.h"

#include "task.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define CHECK_HANDLE(handle) \

  ASSERT((uv_udp_t*)(handle) == &server || (uv_udp_t*)(handle) == &client)

static uv_udp_t server;

static uv_udp_t client;

static uv_buf_t buf;

static struct sockaddr_in lo_addr;

static int cl_send_cb_called;

static int sv_recv_cb_called;

static int close_cb_called;

static void alloc_cb(uv_handle_t* handle,

                     size_t suggested_size,

                     uv_buf_t* buf) {

  static char slab[65536];

  CHECK_HANDLE(handle);

  ASSERT(suggested_size <= sizeof(slab));

  buf->base = slab;

  buf->len = sizeof(slab);

}

static void close_cb(uv_handle_t* handle) {

  CHECK_HANDLE(handle);

  ASSERT(uv_is_closing(handle));

  close_cb_called++;

}

static void cl_send_cb(uv_udp_send_t* req, int status) {

  int r;

  ASSERT(req != NULL);

  ASSERT(status == 0);

  CHECK_HANDLE(req->handle);

  if (++cl_send_cb_called == 1) {

    uv_udp_connect(&client, NULL);

    r = uv_udp_send(req, &client, &buf, 1, NULL, cl_send_cb);

    ASSERT(r == UV_EDESTADDRREQ);

    r = uv_udp_send(req,

                    &client,

                    &buf,

                    1,

                    (const struct sockaddr*) &lo_addr,

                    cl_send_cb);

    ASSERT(r == 0);

  }

}

static void sv_recv_cb(uv_udp_t* handle,

                       ssize_t nread,

                       const uv_buf_t* rcvbuf,

                       const struct sockaddr* addr,

                       unsigned flags) {

  if (nread > 0) {

    ASSERT(nread == 4);

    ASSERT(addr != NULL);

    ASSERT(memcmp("EXIT", rcvbuf->base, nread) == 0);

    if (++sv_recv_cb_called == 4) {

      uv_close((uv_handle_t*) &server, close_cb);

      uv_close((uv_handle_t*) &client, close_cb);

    }

  }

}

TEST_IMPL(udp_connect) {

#if defined(__PASE__)

  RETURN_SKIP(

      "IBMi PASE's UDP connection can not be disconnected with AF_UNSPEC.");

#endif

  uv_udp_send_t req;

  struct sockaddr_in ext_addr;

  struct sockaddr_in tmp_addr;

  int r;

  int addrlen;

  ASSERT(0 == uv_ip4_addr("0.0.0.0", TEST_PORT, &lo_addr));

  r = uv_udp_init(uv_default_loop(), &server);

  ASSERT(r == 0);

  r = uv_udp_bind(&server, (const struct sockaddr*) &lo_addr, 0);

  ASSERT(r == 0);

  r = uv_udp_recv_start(&server, alloc_cb, sv_recv_cb);

  ASSERT(r == 0);

  r = uv_udp_init(uv_default_loop(), &client);

  ASSERT(r == 0);

  buf = uv_buf_init("EXIT", 4);

  // connect() to INADDR_ANY fails on Windows wih WSAEADDRNOTAVAIL

  ASSERT_EQ(0, uv_ip4_addr("0.0.0.0", TEST_PORT, &tmp_addr));

  r = uv_udp_connect(&client, (const struct sockaddr*) &tmp_addr);

#ifdef _WIN32

  ASSERT_EQ(r, UV_EADDRNOTAVAIL);

#else

  ASSERT_EQ(r, 0);

  r = uv_udp_connect(&client, NULL);

  ASSERT_EQ(r, 0);

#endif

  ASSERT(0 == uv_ip4_addr("8.8.8.8", TEST_PORT, &ext_addr));

  ASSERT(0 == uv_ip4_addr("127.0.0.1", TEST_PORT, &lo_addr));

  r = uv_udp_connect(&client, (const struct sockaddr*) &lo_addr);

  ASSERT(r == 0);

  r = uv_udp_connect(&client, (const struct sockaddr*) &ext_addr);

  ASSERT(r == UV_EISCONN);

  addrlen = sizeof(tmp_addr);

  r = uv_udp_getpeername(&client, (struct sockaddr*) &tmp_addr, &addrlen);

  ASSERT(r == 0);

  /* To send messages in connected UDP sockets addr must be NULL */

  r = uv_udp_try_send(&client, &buf, 1, (const struct sockaddr*) &lo_addr);

  ASSERT(r == UV_EISCONN);

  r = uv_udp_try_send(&client, &buf, 1, NULL);

  ASSERT(r == 4);

  r = uv_udp_try_send(&client, &buf, 1, (const struct sockaddr*) &ext_addr);

  ASSERT(r == UV_EISCONN);

  r = uv_udp_connect(&client, NULL);

  ASSERT(r == 0);

  r = uv_udp_connect(&client, NULL);

  ASSERT(r == UV_ENOTCONN);

  addrlen = sizeof(tmp_addr);

  r = uv_udp_getpeername(&client, (struct sockaddr*) &tmp_addr, &addrlen);

  ASSERT(r == UV_ENOTCONN);

  /* To send messages in disconnected UDP sockets addr must be set */

  r = uv_udp_try_send(&client, &buf, 1, (const struct sockaddr*) &lo_addr);

  ASSERT(r == 4);

  r = uv_udp_try_send(&client, &buf, 1, NULL);

  ASSERT(r == UV_EDESTADDRREQ);

  r = uv_udp_connect(&client, (const struct sockaddr*) &lo_addr);

  ASSERT(r == 0);

  r = uv_udp_send(&req,

                  &client,

                  &buf,

                  1,

                  (const struct sockaddr*) &lo_addr,

                  cl_send_cb);

  ASSERT(r == UV_EISCONN);

  r = uv_udp_send(&req, &client, &buf, 1, NULL, cl_send_cb);

  ASSERT(r == 0);

  uv_run(uv_default_loop(), UV_RUN_DEFAULT);

  ASSERT(close_cb_called == 2);

  ASSERT(sv_recv_cb_called == 4);

  ASSERT(cl_send_cb_called == 2);

  ASSERT(client.send_queue_size == 0);

  ASSERT(server.send_queue_size == 0);

  MAKE_VALGRIND_HAPPY();

  return 0;

}