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

/**
  * @file socket_recv.c
  * @authors djb, fefe
  * @ref ucspi-tcp6
  * @brief setup receiving socket
  */

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

  byte_zero(&sa,dummy);
  r = recvfrom(s,buf,len,0,(struct sockaddr *)&sa,&dummy);
  if (r == -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 r;
}