/* 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(__FreeBSD_kernel__) || defined(__NetBSD__)

#include <sys/sysctl.h>

#endif

#define CHECK_HANDLE(handle)                \

  ASSERT((uv_udp_t*)(handle) == &server     \

      || (uv_udp_t*)(handle) == &client     \

      || (uv_timer_t*)(handle) == &timeout)

#define CHECK_REQ(req) \

  ASSERT((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(__FreeBSD_kernel__) || 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(status == 0);

  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(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");

}

static void ipv6_recv_ok(uv_udp_t* handle,

                         ssize_t nread,

                         const uv_buf_t* buf,

                         const struct sockaddr* addr,

                         unsigned flags) {

  CHECK_HANDLE(handle);

  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(nread == 9);

  ASSERT(!memcmp(buf->base, data, 9));

  recv_cb_called++;

}

static void timeout_cb(uv_timer_t* timer) {

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

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

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

}

static void do_test(uv_udp_recv_cb recv_cb, int bind_flags) {

  struct sockaddr_in6 addr6;

  struct sockaddr_in addr;

  int addr6_len;

  int addr_len;

  uv_buf_t buf;

  char dst[256];

  int r;

  ASSERT(0 == uv_ip6_addr("::0", TEST_PORT, &addr6));

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

  ASSERT(r == 0);

  r = uv_udp_bind(&server, (const struct sockaddr*) &addr6, bind_flags);

  ASSERT(r == 0);

  addr6_len = sizeof(addr6);

  ASSERT(uv_udp_getsockname(&server, (struct sockaddr*) &addr6, &addr6_len) == 0);

  ASSERT(uv_inet_ntop(addr6.sin6_family, &addr6.sin6_addr, dst, sizeof(dst)) == 0);

  printf("on [%.*s]:%d\n", (int) sizeof(dst), dst, addr6.sin6_port);

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

  ASSERT(r == 0);

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

  ASSERT(r == 0);

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

  ASSERT(uv_inet_ntop(addr.sin_family, &addr.sin_addr, dst, sizeof(dst)) == 0);

  printf("to [%.*s]:%d\n", (int) sizeof(dst), dst, addr.sin_port);

  /* Create some unique data to send */

  ASSERT(9 == snprintf(data, sizeof(data), "PING%5u", uv_os_getpid() & 0xFFFF));

  buf = uv_buf_init(data, 9);

  printf("sending %s\n", data);

  r = uv_udp_send(&req_,

                  &client,

                  &buf,

                  1,

                  (const struct sockaddr*) &addr,

                  send_cb);

  ASSERT(r == 0);

  addr_len = sizeof(addr);

  ASSERT(uv_udp_getsockname(&client, (struct sockaddr*) &addr, &addr_len) == 0);

  ASSERT(uv_inet_ntop(addr.sin_family, &addr.sin_addr, dst, sizeof(dst)) == 0);

  printf("from [%.*s]:%d\n", (int) sizeof(dst), dst, addr.sin_port);

  client_port = addr.sin_port;

  r = uv_timer_init(uv_default_loop(), &timeout);

  ASSERT(r == 0);

  r = uv_timer_start(&timeout, timeout_cb, 500, 0);

  ASSERT(r == 0);

  ASSERT(close_cb_called == 0);

  ASSERT(send_cb_called == 0);

  ASSERT(recv_cb_called == 0);

  uv_run(uv_default_loop(), UV_RUN_DEFAULT);

  ASSERT(close_cb_called == 3);

  MAKE_VALGRIND_HAPPY();

}

TEST_IMPL(udp_dual_stack) {

#if defined(__CYGWIN__) || defined(__MSYS__)

  /* FIXME: Does Cygwin support this?  */

  RETURN_SKIP("FIXME: This test needs more investigation on Cygwin");

#endif

  if (!can_ipv6())

    RETURN_SKIP("IPv6 not supported");

#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__)

  if (!can_ipv6_ipv4_dual())

    RETURN_SKIP("IPv6-IPv4 dual stack not supported");

#elif defined(__OpenBSD__)

  RETURN_SKIP("IPv6-IPv4 dual stack not supported");

#endif

  do_test(ipv6_recv_ok, 0);

  printf("recv_cb_called %d\n", recv_cb_called);

  printf("send_cb_called %d\n", send_cb_called);

  ASSERT(recv_cb_called == 1);

  ASSERT(send_cb_called == 1);

  return 0;

}

TEST_IMPL(udp_ipv6_only) {

  if (!can_ipv6())

    RETURN_SKIP("IPv6 not supported");

  do_test(ipv6_recv_fail, UV_UDP_IPV6ONLY);

  ASSERT(recv_cb_called == 0);

  ASSERT(send_cb_called == 1);

  return 0;

}