data_link.cpp

#include "data_link.h"
#include <cstring>
#include <pcap.h>

int datalink2off(int dl_id)
{
	int dl_size = 0;
	switch(dl_id) {

#ifdef DLT_NULL /* not tested */
	case DLT_NULL:
		dl_size = 4;
		break;
#endif
#ifdef DLT_EN10MB
	case DLT_EN10MB:
		dl_size = 14;
		break;
#endif
#ifdef DLT_RAW
	case DLT_RAW:
		dl_size = 0;
		break;
#endif
#ifdef DLT_IEEE802_11 /* not tested */
	case DLT_IEEE802_11:
		dl_size = 24;
		break;
#endif
#ifdef DLT_LOOP /* not tested */
	case DLT_LOOP:
		dl_size = 4;
		break;
#endif
#ifdef DLT_PPP_ETHER
	case DLT_PPP_ETHER:
		dl_size = 8;
		break;
#endif
#ifdef DLT_LINUX_SLL
	case DLT_LINUX_SLL:
		dl_size = 16;
		break;
#endif
#ifdef DLT_PFLOG
	case DLT_PFLOG:
		dl_size = 48;
		break;
#endif

/* credits for DLT_PPP, DLT_SLIP, DLT_SLIP_BSDOS
   and DLT_PPP_BSDOS offsets:
   SNiFf v0.3 by uLiX
   http://www.s0ftpj.org/bfi/online/bfi10/BFi10-05.html
*/
#ifdef DLT_PPP
	case DLT_PPP:
		dl_size = 4;
		break;
#endif
#ifdef DLT_SLIP
	case DLT_SLIP:
		dl_size = 16;
		break;
#endif
#ifdef DLT_SLIP_BSDOS
	case DLT_SLIP_BSDOS:
		dl_size = 24;
		break;
#endif
#ifdef DLT_PPP_BSDOS
	case DLT_PPP_BSDOS:
		dl_size = 24;
		break;
#endif

	default:
		break;
	}
	return dl_size;
}

std::string datalink2str(int dl_id)
{
	char str[128];

	switch(dl_id) {
#ifdef DLT_NULL
	case DLT_NULL:
		strcpy(str, "DLT_NULL");
		break;
#endif
#ifdef DLT_EN10MB
	case DLT_EN10MB:
		strcpy(str, "DLT_EN10MB");
		break;
#endif
#ifdef DLT_IEEE802
	case DLT_IEEE802:
		strcpy(str, "DLT_IEEE802");
		break;
#endif
#ifdef DLT_ARCNET
	case DLT_ARCNET:
		strcpy(str, "DLT_ARCNET");
		break;
#endif
#ifdef DLT_FDDI
	case DLT_FDDI:
		strcpy(str, "DLT_FDDI");
		break;
#endif
#ifdef DLT_ATM_RFC1483
	case DLT_ATM_RFC1483:
		strcpy(str, "DLT_ATM_RFC1483");
		break;
#endif
#ifdef DLT_RAW
	case DLT_RAW:
		strcpy(str, "DLT_RAW");
		break;
#endif
#ifdef DLT_PPP_SERIAL
	case DLT_PPP_SERIAL:
		strcpy(str, "DLT_PPP_SERIAL");
		break;
#endif
#ifdef DLT_PPP_ETHER
	case DLT_PPP_ETHER:
		strcpy(str, "DLT_PPP_ETHER");
		break;
#endif
#ifdef DLT_C_HDLC
	case DLT_C_HDLC:
		strcpy(str, "DLT_C_HDLC");
		break;
#endif
#ifdef DLT_IEEE802_11
	case DLT_IEEE802_11:
		strcpy(str, "DLT_IEEE802_11");
		break;
#endif
#ifdef DLT_LOOP
	case DLT_LOOP:
		strcpy(str, "DLT_LOOP");
		break;
#endif
#ifdef DLT_LINUX_SLL
	case DLT_LINUX_SLL:
		strcpy(str, "DLT_LINUX_SLL");
		break;
#endif
#ifdef DLT_LTALK
	case DLT_LTALK:
		strcpy(str, "DLT_LTALK");
		break;
#endif
#ifdef DLT_PFLOG
	case DLT_PFLOG:
		strcpy(str, "DLT_PFLOG");
		break;
#endif
#ifdef DLT_PPP
	case DLT_PPP:
		strcpy(str, "DLT_PPP");
		break;
#endif
#ifdef DLT_SLIP
	case DLT_SLIP:
		strcpy(str, "DLT_SLIP");
		break;
#endif
#ifdef DLT_SLIP_BSDOS
	case DLT_SLIP_BSDOS:
		strcpy(str, "DLT_SLIP_BSDOS");
		break;
#endif
#ifdef DLT_PPP_BSDOS
	case DLT_PPP_BSDOS:
		strcpy(str, "DLT_PPP_BSDOS");
		break;
#endif

	default:
		sprintf(str, "UNKNOWN(0x%x)(%d)" , dl_id , dl_id);
		break;

	}
	return std::string(str);
}