PDU::metadata EAPOL::extract_metadata(const uint8_t *buffer, uint32_t total_sz) {
if (TINS_UNLIKELY(total_sz < sizeof(eapol_header))) {
throw malformed_packet();
}
const eapol_header* header = (const eapol_header*)buffer;
uint32_t advertised_size = Endian::be_to_host<uint16_t>(header->length) + 4;
return metadata(min(total_sz, advertised_size), pdu_flag, PDU::UNKNOWN);
}
EAPOL* EAPOL::from_bytes(const uint8_t* buffer, uint32_t total_sz) {
if (TINS_UNLIKELY(total_sz < sizeof(eapol_header))) {
throw malformed_packet();
}
const eapol_header* ptr = (const eapol_header*)buffer;
uint32_t data_len = Endian::be_to_host<uint16_t>(ptr->length);
// at least 4 for fields always present
total_sz = min(
total_sz,
data_len + 4
);
switch(ptr->type) {
case RC4:
return new Tins::RC4EAPOL(buffer, total_sz);
break;
case RSN:
case EAPOL_WPA:
return new Tins::RSNEAPOL(buffer, total_sz);
break;
}
return 0;
}
PDU::metadata ARP::extract_metadata(const uint8_t* /*buffer*/, uint32_t total_sz) {
if (TINS_UNLIKELY(total_sz < sizeof(arp_header))) {
throw malformed_packet();
}
return metadata(sizeof(arp_header), pdu_flag, PDU::UNKNOWN);
}
