source: libpacketdump/eth_34958.c @ eade363

#include <stdio.h>
#include "libpacketdump.h"

#define POPBYTE(x)                              \
                do {                            \
                        if (len<1) return;      \
                        x=*(packet++);          \
                } while(0)                      

#define POPWORD(x)                              \
                do {                            \
                        if (len<2) return;      \
                        x=htons(*(uint16_t*)packet);    \
                        packet+=2;              \
                } while(0)

static void decode_eap_request(const char *packet, unsigned len)
{
        int v;
        POPBYTE(v);
        printf(" 802.1x: EAP: Identifier: %u\n",v);
        POPWORD(v);
        printf(" 802.1x: EAP: Length: %u\n",v);
        POPBYTE(v);
        printf(" 802.1x: EAP: Type: ");
        switch(v) {
                case 1: printf(" Identity (1)\n"); break;
                case 2: printf(" Notification (2)\n"); break;
                case 3: printf(" NAK (3)\n"); break;
                case 4: printf(" MD5-Challenge (4)\n"); break;
                case 5: printf(" One-Time Password (5)\n"); break;
                case 6: printf(" Generic Token Card (6)\n"); break;
        }
}

static void decode_eap(const char *packet, unsigned len)
{
        int v;
        POPWORD(v);
        printf(" 802.1x: Length: %d\n",v);
        POPBYTE(v);
        printf(" 802.1x: EAP: ");
        switch(v) {
                case 1: 
                        printf("Request (1)\n");
                        decode_eap_request(packet,len);
                        break;
                case 2: printf("Response (2)\n"); break;
                case 3: printf("Success (3)\n"); break;
                case 4: printf("Failure (4)\n"); break;
                default: printf("#0x%02x\n",v); break;
        }
        
}

static void decode_eapol_start(const char *packet, unsigned len)
{
        int v;
        POPWORD(v);
        printf(" 802.1x: Length: %d\n",v);
}

static void decode_eapol_logoff(const char *packet, unsigned len)
{
        int v;
        POPWORD(v);
        printf(" 802.1x: Length: %d\n",v);
}

struct key_descriptor {
                uint8_t descriptor_type;
                uint16_t key_length;
                uint64_t replay_counter;
                uint8_t key_iv[27-12];
                uint8_t kevy_index;
                uint8_t key_signature[44-29];
};

static void decode_eapol_key(const char *packet, unsigned len)
{
        int v;
        POPWORD(v);
        printf(" 802.1x: Length: %d\n",v);
}

static void decode_eapol_encapsulated_asf_alert(const char *packet, unsigned len)
{
        int v;
        POPWORD(v);
        printf(" 802.1x: Length: %d\n",v);
}

void decode(int link_type UNUSED,const char *packet,unsigned len)
{
        int v;
        int type;
        POPBYTE(v);
        printf(" 802.1x: Version: %u\n",v);
        POPBYTE(type);
        printf(" 802.1x: Type: ");
        switch (type) {
                case 0: 
                        printf(" EAP-Packet (0)\n"); 
                        decode_eap(packet,len);
                        break;
                case 1: printf(" EAPOL-Start (1)\n"); 
                        decode_eapol_start(packet,len);
                        break;
                case 2: 
                        printf(" EAPOL-Logoff (2)\n"); 
                        decode_eapol_logoff(packet,len);
                        break;
                case 3: 
                        printf(" EAPOL-Key (3)\n");
                        decode_eapol_key(packet,len);
                        break;
                case 4: 
                        printf(" EAPOL-Encasulated-ASF-Alert (4)\n");
                        decode_eapol_encapsulated_asf_alert(packet,len);
                        break;
                default:
                        printf(" Unknown #0x%02x\n",v);
                        decode_next(packet,len,"eapol",type);
                        break;
        }

        return;
}