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/* Decoder for CHDLC frames */
#include <sys/types.h>
#include <netinet/in.h>
#include <stdio.h>
#include <inttypes.h>
#include <dlfcn.h>
#include "libtrace.h"
#include "libpacketdump.h"
typedef struct libtrace_chdlc_t {
uint8_t address; /** 0xF0 for unicast, 0xF8 for multicast */
uint8_t control; /** Always 0x00 */
uint16_t ethertype;
} libtrace_chdlc_t;
DLLEXPORT void decode(int link_type UNUSED,const char *packet,unsigned len)
{
libtrace_chdlc_t *frame = (libtrace_chdlc_t *)packet;
printf(" CHDLC:");
if (len >= 1)
printf(" Address: 0x%02x", frame->address);
else {
printf("[|Truncated]\n");
return;
}
if (len >= 2)
printf(" Control: 0x%02x", frame->control);
else {
printf("[|Truncated]\n");
return;
}
if (len >= 4) {
printf(" Ethertype: 0x%04x\n", ntohs(frame->ethertype));
decode_next(packet + 4, len - 4, "eth",
ntohs(frame->ethertype));
}
else {
printf("[|Truncated]\n");
return;
}
return;
}
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