#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "byte.h"
#include "socket_if.h"
#include "ip.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));
}