/* Copyright libuv project and other Node 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 int cl_send_cb_called;

static int cl_recv_cb_called;

static int sv_send_cb_called;

static int sv_recv_cb_called;

static int close_cb_called;

static void sv_alloc_cb(uv_handle_t* handle,

                        size_t suggested_size,

                        uv_buf_t* buf) {

  static char slab[65536];

  CHECK_HANDLE(handle);

  buf->base = slab;

  buf->len = sizeof(slab);

}

static void cl_alloc_cb(uv_handle_t* handle,

                        size_t suggested_size,

                        uv_buf_t* buf) {

  /* Do nothing, recv_cb should be called with UV_ENOBUFS. */

}

static void close_cb(uv_handle_t* handle) {

  CHECK_HANDLE(handle);

  ASSERT(1 == uv_is_closing(handle));

  close_cb_called++;

}

static void cl_recv_cb(uv_udp_t* handle,

                       ssize_t nread,

                       const uv_buf_t* buf,

                       const struct sockaddr* addr,

                       unsigned flags) {

  CHECK_HANDLE(handle);

  ASSERT(flags == 0);

  ASSERT(nread == UV_ENOBUFS);

  cl_recv_cb_called++;

  uv_close((uv_handle_t*) handle, close_cb);

}

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

  int r;

  ASSERT(req != NULL);

  ASSERT(status == 0);

  CHECK_HANDLE(req->handle);

  r = uv_udp_recv_start(req->handle, cl_alloc_cb, cl_recv_cb);

  ASSERT(r == 0);

  cl_send_cb_called++;

}

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

  ASSERT(req != NULL);

  ASSERT(status == 0);

  CHECK_HANDLE(req->handle);

  uv_close((uv_handle_t*) req->handle, close_cb);

  free(req);

  sv_send_cb_called++;

}

static void sv_recv_cb(uv_udp_t* handle,

                       ssize_t nread,

                       const uv_buf_t* rcvbuf,

                       const struct sockaddr* addr,

                       unsigned flags) {

  uv_udp_send_t* req;

  uv_buf_t sndbuf;

  int r;

  if (nread < 0) {

    ASSERT(0 && "unexpected error");

  }

  if (nread == 0) {

    /* Returning unused buffer. Don't count towards sv_recv_cb_called */

    ASSERT(addr == NULL);

    return;

  }

  CHECK_HANDLE(handle);

  ASSERT(flags == 0);

  ASSERT(addr != NULL);

  ASSERT(nread == 4);

  ASSERT(!memcmp("PING", rcvbuf->base, nread));

  r = uv_udp_recv_stop(handle);

  ASSERT(r == 0);

  req = malloc(sizeof *req);

  ASSERT(req != NULL);

  sndbuf = uv_buf_init("PONG", 4);

  r = uv_udp_send(req, handle, &sndbuf, 1, addr, sv_send_cb);

  ASSERT(r == 0);

  sv_recv_cb_called++;

}

TEST_IMPL(udp_alloc_cb_fail) {

  struct sockaddr_in addr;

  uv_udp_send_t req;

  uv_buf_t buf;

  int r;

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

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

  ASSERT(r == 0);

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

  ASSERT(r == 0);

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

  ASSERT(r == 0);

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

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

  ASSERT(r == 0);

  buf = uv_buf_init("PING", 4);

  r = uv_udp_send(&req,

                  &client,

                  &buf,

                  1,

                  (const struct sockaddr*) &addr,

                  cl_send_cb);

  ASSERT(r == 0);

  ASSERT(close_cb_called == 0);

  ASSERT(cl_send_cb_called == 0);

  ASSERT(cl_recv_cb_called == 0);

  ASSERT(sv_send_cb_called == 0);

  ASSERT(sv_recv_cb_called == 0);

  uv_run(uv_default_loop(), UV_RUN_DEFAULT);

  ASSERT(cl_send_cb_called == 1);

  ASSERT(cl_recv_cb_called == 1);

  ASSERT(sv_send_cb_called == 1);

  ASSERT(sv_recv_cb_called == 1);

  ASSERT(close_cb_called == 2);

  MAKE_VALGRIND_HAPPY();

  return 0;

}