#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_bind.c
  @author djb, fefe, feh
  @ref qmail, djbdns, ucspi-tcp6
  @brief binding a socket to a local resource
*/

int socket_bind4(int s, const char ip[4], uint16 port)
{
  struct sockaddr_in sa;

  byte_zero(&sa, sizeof(sa));
  sa.sin_family = AF_INET;
  uint16_pack_big((char *)&sa.sin_port, port);
  byte_copy((char *)&sa.sin_addr, 4, ip);

  return bind(s, (struct sockaddr *)&sa, sizeof(sa));
}

int socket_bind4_reuse(int s, const char ip[4], uint16 port)
{
  int opt = 1;
  setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
  return socket_bind4(s, ip, port);
}

/* seems not to be used here -- djbdns requires it */
void socket_tryreservein(int s, int size)
{
  while (size >= 1024) {
    if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)) == 0) return;
    size -= (size >> 5);
  }
}

int socket_bind6(int s, const char ip[16], uint16 port, uint32 scope_id)
{
  struct sockaddr_in6 sa;

  byte_zero(&sa, sizeof(sa));
  sa.sin6_family = AF_INET6;
  uint16_pack_big((char *)&sa.sin6_port, port);
  /*  implicit: sa.sin6_flowinfo = 0; */
  byte_copy((char *)&sa.sin6_addr, 16, ip);
  sa.sin6_scope_id = scope_id;

  return bind(s, (struct sockaddr *)&sa, sizeof(sa));
}

int socket_bind6_reuse(int s, const char ip[16], uint16 port, uint32 scope_id)
{
  int opt = 1;
  setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
  return socket_bind6(s, ip, port, scope_id);
}

int socket_bind(int s, const char ip[16], uint16 port, uint32 scope_id)
{
  if (ip6_isv4mapped(ip)) return socket_bind4(s, ip + 12, port);

  return socket_bind6(s, ip, port, scope_id);
}

int socket_bind_reuse(int s, const char ip[16], uint16 port, uint32 scope_id)
{
  if (ip6_isv4mapped(ip)) return socket_bind4_reuse(s, ip + 12, port);

  return socket_bind6_reuse(s, ip, port, scope_id);
}