socket_send.c

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#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"
#include "error.h"
 
#define WHO "socket_send"
 
int socket_send4(int s,const char *buf,unsigned int len,const char ip[4],uint16 port)
{
  struct sockaddr_in sa;
 
  byte_zero((char *)&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 sendto(s,buf,len,0,(struct sockaddr *)&sa,sizeof(sa));
}
 
int socket_send6(int s,const char *buf,unsigned int len,const char ip[16],uint16 port,uint32 scope_id)
{
  struct sockaddr_in6 sa;
 
  byte_zero((char *)&sa,sizeof(sa));
 
  sa.sin6_family = AF_INET6;
  sa.sin6_scope_id = scope_id;
  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));
}
 
int socket_send(int s,const char *buf,unsigned int len,const char ip[16],uint16 port,uint32 scope_id)
{ 
  struct sockaddr_storage addr;
  socklen_t len_sas = sizeof(addr);
 
  if (getsockname(s,(struct sockaddr *)&addr,&len_sas) == -1) {
    errno = EPROTO;
    return -1;
  }
  
  if (addr.ss_family == AF_INET)
    return socket_send4(s,buf,len,ip + 12,port);
  else 
    return socket_send6(s,buf,len,ip,port,scope_id);
} 
 
int socket_broadcast4(int s,const char *buf,unsigned int len,uint16 port)
{
  struct sockaddr_in sa;
 
  byte_zero((char *)&sa,sizeof(sa));
 
  sa.sin_family = AF_INET;
  uint16_pack_big((char *)&sa.sin_port,port);
  byte_copy((char *)&sa.sin_addr,4,V4broadcast);
 
  return sendto(s,buf,len,0,(struct sockaddr *)&sa,sizeof(sa));
}