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/* Copyright Joyent, Inc. 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>

#if defined(__FreeBSD__) || defined(__NetBSD__)
#include <sys/sysctl.h>
#endif

#define CHECK_HANDLE(handle)                   \
  ASSERT_NE((uv_udp_t*)(handle) == &server     \
         || (uv_udp_t*)(handle) == &client     \
         || (uv_timer_t*)(handle) == &timeout, 0)

#define CHECK_REQ(req) \
  ASSERT_PTR_EQ((req), &req_);

static uv_udp_t client;
static uv_udp_t server;
static uv_udp_send_t req_;
static char data[10];
static uv_timer_t timeout;

static int send_cb_called;
static int recv_cb_called;
static int close_cb_called;
static uint16_t client_port;

#if defined(__FreeBSD__) || defined(__NetBSD__)
static int can_ipv6_ipv4_dual(void) {
  int v6only;
  size_t size = sizeof(int);

  if (sysctlbyname("net.inet6.ip6.v6only", &v6only, &size, NULL, 0))
    return 0;

  return v6only != 1;
}
#endif


static void 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 close_cb(uv_handle_t* handle) {
  CHECK_HANDLE(handle);
  close_cb_called++;
}


static void send_cb(uv_udp_send_t* req, int status) {
  CHECK_REQ(req);
  CHECK_HANDLE(req->handle);
  ASSERT_OK(status);
  send_cb_called++;
}

static int is_from_client(const struct sockaddr* addr) {
  const struct sockaddr_in6* addr6;
  char dst[256];
  int r;

  /* Debugging output, and filter out unwanted network traffic */
  if (addr != NULL) {
    ASSERT_EQ(addr->sa_family, AF_INET6);
    addr6 = (struct sockaddr_in6*) addr;
    r = uv_inet_ntop(addr->sa_family, &addr6->sin6_addr, dst, sizeof(dst));
    if (r == 0)
      printf("from [%.*s]:%d\n", (int) sizeof(dst), dst, addr6->sin6_port);
    if (addr6->sin6_port != client_port)
      return 0;
    if (r != 0 || strcmp(dst, "::ffff:127.0.0.1"))
      return 0;
  }
  return 1;
}


static void ipv6_recv_fail(uv_udp_t* handle,
                           ssize_t nread,
                           const uv_buf_t* buf,
                           const struct sockaddr* addr,
                           unsigned flags) {
  printf("got %d %.*s\n", (int) nread, nread > 0 ? (int) nread : 0, buf->base);
  if (!is_from_client(addr) || (nread == 0 && addr == NULL))
    return;
  ASSERT(0 && "this function should not have been called");