print-eigrp.c

来自「TCPDUMP的C语言源代码,是在数据链路层的应用」· C语言 代码 · 共 481 行 · 第 1/2 页

    }

    /* in non-verbose mode just lets print the basic Message Type*/
    if (vflag < 1) {
        printf("EIGRP %s, length: %u",
               tok2str(eigrp_opcode_values, "unknown (%u)",eigrp_com_header->opcode),
               len);
        return;
    }

    /* ok they seem to want to know everything - lets fully decode it */

    tlen=len-sizeof(struct eigrp_common_header);

    /* FIXME print other header info */
    printf("\n\tEIGRP v%u, opcode: %s (%u), chksum: 0x%04x, Flags: [%s]\n\tseq: 0x%08x, ack: 0x%08x, AS: %u, length: %u",
           eigrp_com_header->version,
           tok2str(eigrp_opcode_values, "unknown, type: %u",eigrp_com_header->opcode),
           eigrp_com_header->opcode,
           EXTRACT_16BITS(&eigrp_com_header->checksum),
           tok2str(eigrp_common_header_flag_values,
                   "none",
                   EXTRACT_32BITS(&eigrp_com_header->flags)),
           EXTRACT_32BITS(&eigrp_com_header->seq),
           EXTRACT_32BITS(&eigrp_com_header->ack),
           EXTRACT_32BITS(&eigrp_com_header->asn),
           tlen);

    tptr+=sizeof(const struct eigrp_common_header);

    while(tlen>0) {
        /* did we capture enough for fully decoding the object header ? */
        TCHECK2(*tptr, sizeof(struct eigrp_tlv_header));

        eigrp_tlv_header = (const struct eigrp_tlv_header *)tptr;
        eigrp_tlv_len=EXTRACT_16BITS(&eigrp_tlv_header->length);
        eigrp_tlv_type=EXTRACT_16BITS(&eigrp_tlv_header->type);


        if (eigrp_tlv_len < sizeof(struct eigrp_tlv_header) ||
            eigrp_tlv_len > tlen) {
            print_unknown_data(tptr+sizeof(sizeof(struct eigrp_tlv_header)),"\n\t    ",tlen);
            return;
        }

        printf("\n\t  %s TLV (0x%04x), length: %u",
               tok2str(eigrp_tlv_values,
                       "Unknown",
                       eigrp_tlv_type),
               eigrp_tlv_type,
               eigrp_tlv_len);

        tlv_tptr=tptr+sizeof(struct eigrp_tlv_header);
        tlv_tlen=eigrp_tlv_len-sizeof(struct eigrp_tlv_header);

        /* did we capture enough for fully decoding the object ? */
        TCHECK2(*tptr, eigrp_tlv_len);

        switch(eigrp_tlv_type) {

        case EIGRP_TLV_GENERAL_PARM:
            tlv_ptr.eigrp_tlv_general_parm = (const struct eigrp_tlv_general_parm_t *)tlv_tptr;

            printf("\n\t    holdtime: %us, k1 %u, k2 %u, k3 %u, k4 %u, k5 %u",
                   EXTRACT_16BITS(tlv_ptr.eigrp_tlv_general_parm->holdtime),
                   tlv_ptr.eigrp_tlv_general_parm->k1,
                   tlv_ptr.eigrp_tlv_general_parm->k2,
                   tlv_ptr.eigrp_tlv_general_parm->k3,
                   tlv_ptr.eigrp_tlv_general_parm->k4,
                   tlv_ptr.eigrp_tlv_general_parm->k5);
            break;

        case EIGRP_TLV_SW_VERSION:
            tlv_ptr.eigrp_tlv_sw_version = (const struct eigrp_tlv_sw_version_t *)tlv_tptr;

            printf("\n\t    IOS version: %u.%u, EIGRP version %u.%u",
                   tlv_ptr.eigrp_tlv_sw_version->ios_major,
                   tlv_ptr.eigrp_tlv_sw_version->ios_minor,
                   tlv_ptr.eigrp_tlv_sw_version->eigrp_major,
                   tlv_ptr.eigrp_tlv_sw_version->eigrp_minor);
            break;

        case EIGRP_TLV_IP_INT:
            tlv_ptr.eigrp_tlv_ip_int = (const struct eigrp_tlv_ip_int_t *)tlv_tptr;

            bit_length = tlv_ptr.eigrp_tlv_ip_int->plen;
            if (bit_length > 32) {
                printf("\n\t    illegal prefix length %u",bit_length);
                break;
            }
            byte_length = (bit_length + 7) / 8; /* variable length encoding */
            memset(prefix, 0, 4);
            memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_int->destination,byte_length);

            printf("\n\t    IPv4 prefix: %15s/%u, nexthop: ",
                   ipaddr_string(prefix),
                   bit_length);
            if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->nexthop) == 0)
                printf("self");
            else
                printf("%s",ipaddr_string(&tlv_ptr.eigrp_tlv_ip_int->nexthop));

            printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
                   (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->delay)/100),
                   EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->bandwidth),
                   EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_ip_int->mtu),
                   tlv_ptr.eigrp_tlv_ip_int->hopcount,
                   tlv_ptr.eigrp_tlv_ip_int->reliability,
                   tlv_ptr.eigrp_tlv_ip_int->load);
            break;

        case EIGRP_TLV_IP_EXT:
            tlv_ptr.eigrp_tlv_ip_ext = (const struct eigrp_tlv_ip_ext_t *)tlv_tptr;

            bit_length = tlv_ptr.eigrp_tlv_ip_ext->plen;
            if (bit_length > 32) {
                printf("\n\t    illegal prefix length %u",bit_length);
                break;
            }
            byte_length = (bit_length + 7) / 8; /* variable length encoding */
            memset(prefix, 0, 4);
            memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_ext->destination,byte_length);

            printf("\n\t    IPv4 prefix: %15s/%u, nexthop: ",
                   ipaddr_string(prefix),
                   bit_length);
            if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->nexthop) == 0)
                printf("self");
            else
                printf("%s",ipaddr_string(&tlv_ptr.eigrp_tlv_ip_ext->nexthop));

            printf("\n\t      origin-router %s, origin-as %u, origin-proto %s, flags [0x%02x], tag 0x%08x, metric %u",
                   ipaddr_string(tlv_ptr.eigrp_tlv_ip_ext->origin_router),
                   EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->origin_as),
                   tok2str(eigrp_ext_proto_id_values,"unknown",tlv_ptr.eigrp_tlv_ip_ext->proto_id),
                   tlv_ptr.eigrp_tlv_ip_ext->flags,
                   EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->tag),
                   EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->metric));

            printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
                   (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->delay)/100),
                   EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->bandwidth),
                   EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_ip_ext->mtu),
                   tlv_ptr.eigrp_tlv_ip_ext->hopcount,
                   tlv_ptr.eigrp_tlv_ip_ext->reliability,
                   tlv_ptr.eigrp_tlv_ip_ext->load);
            break;

        case EIGRP_TLV_AT_CABLE_SETUP:
            tlv_ptr.eigrp_tlv_at_cable_setup = (const struct eigrp_tlv_at_cable_setup_t *)tlv_tptr;

            printf("\n\t    Cable-range: %u-%u, Router-ID %u",
                   EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->cable_start),
                   EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->cable_end),
                   EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->router_id));
            break;

        case EIGRP_TLV_AT_INT:
            tlv_ptr.eigrp_tlv_at_int = (const struct eigrp_tlv_at_int_t *)tlv_tptr;

            printf("\n\t     Cable-Range: %u-%u, nexthop: ",
                   EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->cable_start),
                   EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->cable_end));

            if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop) == 0)
                printf("self");
            else
                printf("%u.%u",
                       EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop),
                       EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop[2]));

            printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
                   (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->delay)/100),
                   EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->bandwidth),
                   EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_at_int->mtu),
                   tlv_ptr.eigrp_tlv_at_int->hopcount,
                   tlv_ptr.eigrp_tlv_at_int->reliability,
                   tlv_ptr.eigrp_tlv_at_int->load);
            break;

        case EIGRP_TLV_AT_EXT:
            tlv_ptr.eigrp_tlv_at_ext = (const struct eigrp_tlv_at_ext_t *)tlv_tptr;

            printf("\n\t     Cable-Range: %u-%u, nexthop: ",
                   EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->cable_start),
                   EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->cable_end));

            if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop) == 0)
                printf("self");
            else
                printf("%u.%u",
                       EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop),
                       EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop[2]));

            printf("\n\t      origin-router %u, origin-as %u, origin-proto %s, flags [0x%02x], tag 0x%08x, metric %u",
                   EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->origin_router),
                   EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->origin_as),
                   tok2str(eigrp_ext_proto_id_values,"unknown",tlv_ptr.eigrp_tlv_at_ext->proto_id),
                   tlv_ptr.eigrp_tlv_at_ext->flags,
                   EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->tag),
                   EXTRACT_16BITS(tlv_ptr.eigrp_tlv_at_ext->metric));

            printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
                   (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->delay)/100),
                   EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->bandwidth),
                   EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_at_ext->mtu),
                   tlv_ptr.eigrp_tlv_at_ext->hopcount,
                   tlv_ptr.eigrp_tlv_at_ext->reliability,
                   tlv_ptr.eigrp_tlv_at_ext->load);
            break;

            /*
             * FIXME those are the defined TLVs that lack a decoder
             * you are welcome to contribute code ;-)
             */

        case EIGRP_TLV_AUTH:
        case EIGRP_TLV_SEQ:
        case EIGRP_TLV_MCAST_SEQ:
        case EIGRP_TLV_IPX_INT:
        case EIGRP_TLV_IPX_EXT:

        default:
            if (vflag <= 1)
                print_unknown_data(tlv_tptr,"\n\t    ",tlv_tlen);
            break;
        }
        /* do we want to see an additionally hexdump ? */
        if (vflag > 1)
            print_unknown_data(tptr+sizeof(sizeof(struct eigrp_tlv_header)),"\n\t    ",
                               eigrp_tlv_len-sizeof(struct eigrp_tlv_header));

        tptr+=eigrp_tlv_len;
        tlen-=eigrp_tlv_len;
    }
    return;
trunc:
    printf("\n\t\t packet exceeded snapshot");
}