void
ahcp_print(netdissect_options *ndo, const u_char *cp, const u_int len)
{
const u_char *ep = cp + len;
uint8_t version;
ND_PRINT((ndo, "AHCP"));
if (len < 2)
goto invalid;
/* Magic */
ND_TCHECK2(*cp, 1);
if (*cp != AHCP_MAGIC_NUMBER)
goto invalid;
cp += 1;
/* Version */
ND_TCHECK2(*cp, 1);
version = *cp;
cp += 1;
switch (version) {
case AHCP_VERSION_1: {
ND_PRINT((ndo, " Version 1"));
if (len < AHCP1_HEADER_FIX_LEN)
goto invalid;
if (!ndo->ndo_vflag) {
ND_TCHECK2(*cp, AHCP1_HEADER_FIX_LEN - 2);
cp += AHCP1_HEADER_FIX_LEN - 2;
} else {
/* Hopcount */
ND_TCHECK2(*cp, 1);
ND_PRINT((ndo, "\n\tHopcount %u", *cp));
cp += 1;
/* Original Hopcount */
ND_TCHECK2(*cp, 1);
ND_PRINT((ndo, ", Original Hopcount %u", *cp));
cp += 1;
/* Nonce */
ND_TCHECK2(*cp, 4);
ND_PRINT((ndo, ", Nonce 0x%08x", EXTRACT_32BITS(cp)));
cp += 4;
/* Source Id */
ND_TCHECK2(*cp, 8);
ND_PRINT((ndo, ", Source Id %s", linkaddr_string(ndo, cp, 0, 8)));
cp += 8;
/* Destination Id */
ND_TCHECK2(*cp, 8);
ND_PRINT((ndo, ", Destination Id %s", linkaddr_string(ndo, cp, 0, 8)));
cp += 8;
}
/* Body */
ahcp1_body_print(ndo, cp, ep);
break;
}
default:
ND_PRINT((ndo, " Version %u (unknown)", version));
break;
}
return;
invalid:
ND_PRINT((ndo, "%s", istr));
ND_TCHECK2(*cp, ep - cp);
return;
trunc:
ND_PRINT((ndo, "%s", tstr));
}
void
ahcp_print(netdissect_options *ndo, const u_char *cp, const u_int len)
{
const u_char *ep = ndo->ndo_snapend;
uint8_t version;
ndo->ndo_protocol = "ahcp";
ND_PRINT("AHCP");
if (len < 2)
goto invalid;
/* Magic */
ND_TCHECK_1(cp);
if (EXTRACT_U_1(cp) != AHCP_MAGIC_NUMBER)
goto invalid;
cp += 1;
/* Version */
ND_TCHECK_1(cp);
version = EXTRACT_U_1(cp);
cp += 1;
switch (version) {
case AHCP_VERSION_1: {
ND_PRINT(" Version 1");
if (len < AHCP1_HEADER_FIX_LEN)
goto invalid;
if (!ndo->ndo_vflag) {
ND_TCHECK_LEN(cp, AHCP1_HEADER_FIX_LEN - 2);
cp += AHCP1_HEADER_FIX_LEN - 2;
} else {
/* Hopcount */
ND_TCHECK_1(cp);
ND_PRINT("\n\tHopcount %u", EXTRACT_U_1(cp));
cp += 1;
/* Original Hopcount */
ND_TCHECK_1(cp);
ND_PRINT(", Original Hopcount %u", EXTRACT_U_1(cp));
cp += 1;
/* Nonce */
ND_TCHECK_4(cp);
ND_PRINT(", Nonce 0x%08x", EXTRACT_BE_U_4(cp));
cp += 4;
/* Source Id */
ND_TCHECK_8(cp);
ND_PRINT(", Source Id %s", linkaddr_string(ndo, cp, 0, 8));
cp += 8;
/* Destination Id */
ND_TCHECK_8(cp);
ND_PRINT(", Destination Id %s", linkaddr_string(ndo, cp, 0, 8));
cp += 8;
}
/* Body */
ahcp1_body_print(ndo, cp, ep);
break;
}
default:
ND_PRINT(" Version %u (unknown)", version);
break;
}
return;
invalid:
ND_PRINT("%s", istr);
ND_TCHECK_LEN(cp, ep - cp);
return;
trunc:
nd_print_trunc(ndo);
}