socket_send6.c

It support IPv4 and IPv6 unicast and multicast and contains a trivial sender and a trivial receiver

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "byte.h"
#include "socket.h"
#include "ip6.h"
#include "haveip6.h"
#include "error.h"

int socket_send6(int s,const char *buf,unsigned int len,const char ip[16],uint16 port,uint32 scope_id)
{
#ifdef LIBC_HAS_IP6
  struct sockaddr_in6 sa;
#else
  struct sockaddr_in sa;
#endif

  byte_zero(&sa,sizeof sa);
#ifdef LIBC_HAS_IP6
  if (noipv6) {
#endif
    if (ip6_isv4mapped(ip))
      return socket_send4(s,buf,len,ip+12,port);
    if (byte_equal(ip,16,V6loopback))
      return socket_send4(s,buf,len,ip4loopback,port);
#ifdef LIBC_HAS_IP6
    errno=error_proto;
    return -1;
  }
  sa.sin6_family = AF_INET6;
  uint16_pack_big((char *) &sa.sin6_port,port);
  byte_copy((char *) &sa.sin6_addr,16,ip);
  return sendto(s,buf,len,0,(struct sockaddr *) &sa,sizeof sa);
#else
  errno=error_proto;
  return -1;
#endif
}