#include <netinet/in.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/types.h>

#include "byte.h"
#include "ip.h"
#include "socket_if.h"

/**
  @file socket_setup.c
  @authors djb, feh
  @ref ucspi-tcp6
  @brief setup listening socket
*/

int socket_accept(int s, char ip[16], uint16 *port, uint32 *scope_id)
{
  struct sockaddr_in6 sa;
  unsigned int dummy = sizeof(sa);
  int fd;

  fd = accept(s, (struct sockaddr *)&sa, &dummy);
  if (fd == -1) return -1;

  if (sa.sin6_family == AF_INET) {
    struct sockaddr_in *sa4 = (struct sockaddr_in *)&sa;
    byte_copy(ip, 12, V4mappedprefix);
    byte_copy(ip + 12, 4, (char *)&sa4->sin_addr);
    uint16_unpack_big((char *)&sa4->sin_port, port);
    if (scope_id) *scope_id = 0;
  } else {
    byte_copy(ip, 16, (char *)&sa.sin6_addr);
    uint16_unpack_big((char *)&sa.sin6_port, port);
    if (scope_id) *scope_id = sa.sin6_scope_id;
  }

  return fd;
}

int socket_accept4(int s, char ip[4], uint16 *port)
{
  struct sockaddr_in sa;
  unsigned int dummy = sizeof(sa);
  int fd;

  fd = accept(s, (struct sockaddr *)&sa, &dummy);
  if (fd == -1) return -1;

  byte_copy(ip, 4, (char *)&sa.sin_addr);
  uint16_unpack_big((char *)&sa.sin_port, port);

  return fd;
}

int socket_listen(int s, int backlog)
{
  return listen(s, backlog);
}

int socket_ipoptionskill(int s)
{
  int r;

  r = setsockopt(s, IPPROTO_IP, 1, (char *)0, 0); /* 1 == IP_OPTIONS */
  r = setsockopt(s, IPPROTO_IPV6, 1, (char *)0, 0);

  return r;
}

int socket_ip6anycast(int s)
{
  int opt = 1;
  int r;

#ifdef GEN_IP_PKTINFO /* Linux */
  r = setsockopt(s, IPPROTO_IP, GEN_IP_PKTINFO, &opt, sizeof(opt));
#elif IP_PKTINFO     /* Solaris */
  r = setsockopt(s, IPPROTO_IP, IP_PKTINFO, &opt, sizeof(opt));
#elif IP_RECVDSTADDR /* BSD */
  r = setsockopt(s, IPPROTO_IP, IP_RECVDSTADDR, &opt, sizeof(opt));
#elif IPV6_RECVDSTADDR
  r = setsockopt(s, IPPROTO_IPV6, IP_RECVDSTADDR, &opt, sizeof(opt));
#endif
  return r;
}

int socket_dualstack(int s)
{
  int opt = 0;

  return setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &opt, sizeof(opt));
}

int socket_nodualstack(int s)
{
  int opt = 1;

  return setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &opt, sizeof(opt));
}