/*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code
 * distributions retain the above copyright notice and this paragraph
 * in its entirety, and (2) distributions including binary code include
 * the above copyright notice and this paragraph in its entirety in
 * the documentation or other materials provided with the distribution.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE.
 *
 * Original code by Hannes Gredler (hannes@juniper.net)
 *  and Steinar Haug (sthaug@nethelp.no)
 */


#include <unistd.h>
#include <stdlib.h>

#include <argus_compat.h>

#include <rabins.h>
#include <argus_util.h>
#include <argus_client.h>
#include <argus_main.h>
#include <argus_filter.h>

#include <signal.h>
#include <ctype.h>
#include <argus/extract.h>

extern u_char *snapend;

#include "interface.h"
#include "l2vpn.h"

extern char ArgusBuf[];

/*
 * ldp common header
 *
 *  0                   1                   2                   3
 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |  Version                      |         PDU Length            |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                         LDP Identifier                        |
 * +                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                               |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 */

struct ldp_common_header {
    u_int8_t version[2];
    u_int8_t pdu_length[2];
    u_int8_t lsr_id[4];
    u_int8_t label_space[2];
};

#define LDP_VERSION 1

/*
 * ldp message header
 *
 *  0                   1                   2                   3
 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |U|   Message Type              |      Message Length           |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                     Message ID                                |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                                                               |
 * +                                                               +
 * |                     Mandatory Parameters                      |
 * +                                                               +
 * |                                                               |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                                                               |
 * +                                                               +
 * |                     Optional Parameters                       |
 * +                                                               +
 * |                                                               |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 */

struct ldp_msg_header {
    u_int8_t type[2];
    u_int8_t length[2];
    u_int8_t id[4];
};

#define   LDP_MASK_MSG_TYPE(x)  ((x)&0x7fff) 
#define   LDP_MASK_U_BIT(x)     ((x)&0x8000) 

#define   LDP_MSG_NOTIF                0x0001
#define   LDP_MSG_HELLO                0x0100
#define   LDP_MSG_INIT                 0x0200
#define   LDP_MSG_KEEPALIVE            0x0201
#define   LDP_MSG_ADDRESS              0x0300
#define   LDP_MSG_ADDRESS_WITHDRAW     0x0301
#define   LDP_MSG_LABEL_MAPPING        0x0400
#define   LDP_MSG_LABEL_REQUEST        0x0401
#define   LDP_MSG_LABEL_WITHDRAW       0x0402
#define   LDP_MSG_LABEL_RELEASE        0x0403
#define   LDP_MSG_LABEL_ABORT_REQUEST  0x0404

#define   LDP_VENDOR_PRIVATE_MIN       0x3e00
#define   LDP_VENDOR_PRIVATE_MAX       0x3eff
#define   LDP_EXPERIMENTAL_MIN         0x3f00
#define   LDP_EXPERIMENTAL_MAX         0x3fff

static const struct tok ldp_msg_values[] = {
    { LDP_MSG_NOTIF,                "Notification" },
    { LDP_MSG_HELLO,                "Hello" },
    { LDP_MSG_INIT,                "Initialization" },
    { LDP_MSG_KEEPALIVE,             "Keepalive" },
    { LDP_MSG_ADDRESS,                "Address" },
    { LDP_MSG_ADDRESS_WITHDRAW,        "Address Widthdraw" },
    { LDP_MSG_LABEL_MAPPING,        "Label Mapping" },
    { LDP_MSG_LABEL_REQUEST,        "Label Request" },
    { LDP_MSG_LABEL_WITHDRAW,        "Label Withdraw" },
    { LDP_MSG_LABEL_RELEASE,        "Label Release" },
    { LDP_MSG_LABEL_ABORT_REQUEST,   "Label Abort Request" },
    { 0, NULL}
};

#define   LDP_MASK_TLV_TYPE(x)  ((x)&0x3fff) 
#define   LDP_MASK_F_BIT(x) ((x)&0x4000) 

#define   LDP_TLV_FEC                  0x0100
#define   LDP_TLV_ADDRESS_LIST         0x0101
#define   LDP_TLV_HOP_COUNT            0x0103
#define   LDP_TLV_PATH_VECTOR          0x0104
#define   LDP_TLV_GENERIC_LABEL        0x0200
#define   LDP_TLV_ATM_LABEL            0x0201
#define   LDP_TLV_FR_LABEL             0x0202
#define   LDP_TLV_STATUS               0x0300
#define   LDP_TLV_EXTD_STATUS          0x0301
#define   LDP_TLV_RETURNED_PDU         0x0302
#define   LDP_TLV_RETURNED_MSG         0x0303
#define   LDP_TLV_COMMON_HELLO         0x0400
#define   LDP_TLV_IPV4_TRANSPORT_ADDR  0x0401
#define   LDP_TLV_CONFIG_SEQ_NUMBER    0x0402
#define   LDP_TLV_IPV6_TRANSPORT_ADDR  0x0403
#define   LDP_TLV_COMMON_SESSION       0x0500
#define   LDP_TLV_ATM_SESSION_PARM     0x0501
#define   LDP_TLV_FR_SESSION_PARM      0x0502
#define LDP_TLV_FT_SESSION        0x0503
#define   LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600

static const struct tok ldp_tlv_values[] = {
    { LDP_TLV_FEC,                "FEC" },
    { LDP_TLV_ADDRESS_LIST,          "Address List" },
    { LDP_TLV_HOP_COUNT,             "Hop Count" },
    { LDP_TLV_PATH_VECTOR,           "Path Vector" },
    { LDP_TLV_GENERIC_LABEL,         "Generic Label" },
    { LDP_TLV_ATM_LABEL,             "ATM Label" },
    { LDP_TLV_FR_LABEL,              "Frame-Relay Label" },
    { LDP_TLV_STATUS,                "Status" },
    { LDP_TLV_EXTD_STATUS,           "Extended Status" },
    { LDP_TLV_RETURNED_PDU,          "Returned PDU" },
    { LDP_TLV_RETURNED_MSG,          "Returned Message" },
    { LDP_TLV_COMMON_HELLO,          "Common Hello Parameters" },
    { LDP_TLV_IPV4_TRANSPORT_ADDR,   "IPv4 Transport Address" },
    { LDP_TLV_CONFIG_SEQ_NUMBER,     "Configuration Sequence Number" },
    { LDP_TLV_IPV6_TRANSPORT_ADDR,   "IPv6 Transport Address" },
    { LDP_TLV_COMMON_SESSION,        "Common Session Parameters" },
    { LDP_TLV_ATM_SESSION_PARM,      "ATM Session Parameters" },
    { LDP_TLV_FR_SESSION_PARM,       "Frame-Relay Session Parameters" },
    { LDP_TLV_FT_SESSION,            "Fault-Tolerant Session Parameters" },
    { LDP_TLV_LABEL_REQUEST_MSG_ID,  "Label Request Message ID" },
    { 0, NULL}
};

#define LDP_FEC_WILDCARD   0x01
#define LDP_FEC_PREFIX      0x02
#define LDP_FEC_HOSTADDRESS   0x03
/* From draft-martini-l2circuit-trans-mpls-13.txt */
#define LDP_FEC_MARTINI_VC   0x80

static const struct tok ldp_fec_values[] = {
    { LDP_FEC_WILDCARD,      "Wildcard" },
    { LDP_FEC_PREFIX,      "Prefix" },
    { LDP_FEC_HOSTADDRESS,   "Host address" },
    { LDP_FEC_MARTINI_VC,   "Martini VC" },
    { 0, NULL}
};

#define LDP_FEC_MARTINI_IFPARM_MTU  0x01
#define LDP_FEC_MARTINI_IFPARM_DESC 0x03
#define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c

static const struct tok ldp_fec_martini_ifparm_values[] = {
    { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
    { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
    { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
    { 0, NULL}
};

/* draft-ietf-pwe3-vccv-04.txt */
static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
    { 0x01, "PWE3 control word" },
    { 0x02, "MPLS Router Alert Label" },
    { 0x04, "MPLS inner label TTL = 1" },
    { 0, NULL}
};

/* draft-ietf-pwe3-vccv-04.txt */
static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
    { 0x01, "ICMP Ping" },
    { 0x02, "LSP Ping" },
    { 0x04, "BFD" },
    { 0, NULL}
};

/* RFC1700 address family numbers, same definition in print-bgp.c */
#define AFNUM_INET   1
#define AFNUM_INET6   2

#define FALSE 0
#define TRUE  1

int ldp_msg_print(register const u_char *);
int ldp_tlv_print(register const u_char *);
   
/* 
 * ldp tlv header
 *
 *  0                   1                   2                   3
 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |U|F|        Type               |            Length             |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                                                               |
 * |                             Value                             |
 * ~                                                               ~
 * |                                                               |
 * |                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                               |
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 */

int
ldp_tlv_print(register const u_char *tptr) {

    struct ldp_tlv_header {
        u_int8_t type[2];
        u_int8_t length[2];
    };

    const struct ldp_tlv_header *ldp_tlv_header;
    u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
    u_char fec_type;
    u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
    char buf[100];
    int i;

    ldp_tlv_header = (const struct ldp_tlv_header *)tptr;    
    tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
    tlv_tlen=tlv_len;
    tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));

    /* FIXME vendor private / experimental check */
    sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t    %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
           tok2str(ldp_tlv_values,
                   "Unknown",
                   tlv_type),
           tlv_type,
           tlv_len,
           LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore",
           LDP_MASK_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't");

    tptr+=sizeof(struct ldp_tlv_header);

    switch(tlv_type) {

    case LDP_TLV_COMMON_HELLO:
        sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t      Hold Time: %us, Flags: [%s Hello%s]",
               EXTRACT_16BITS(tptr),
               (EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
               (EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : "");
        break;

    case LDP_TLV_IPV4_TRANSPORT_ADDR:
        sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t      IPv4 Transport Address: %s", ipaddr_string(tptr));
        break;
#ifdef INET6
    case LDP_TLV_IPV6_TRANSPORT_ADDR:
        sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t      IPv6 Transport Address: %s", ip6addr_string(tptr));
        break;
#endif
    case LDP_TLV_CONFIG_SEQ_NUMBER:
        sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t      Sequence Number: %u", EXTRACT_32BITS(tptr));
        break;

    case LDP_TLV_ADDRESS_LIST:
   af = EXTRACT_16BITS(tptr);
   tptr+=2;
   sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t      Adress Family: ");
   if (af == AFNUM_INET) {
       sprintf(&ArgusBuf[strlen(ArgusBuf)],"IPv4, addresses:");
       for (i=0; i<(tlv_tlen-2)/4; i++) {
      sprintf(&ArgusBuf[strlen(ArgusBuf)]," %s",ipaddr_string(tptr));
      tptr+=sizeof(struct in_addr);
       }
   }
#ifdef INET6
   else if (af == AFNUM_INET6) {
       sprintf(&ArgusBuf[strlen(ArgusBuf)],"IPv6, addresses:");
       for (i=0; i<(tlv_tlen-2)/16; i++) {
      sprintf(&ArgusBuf[strlen(ArgusBuf)]," %s",ip6addr_string(tptr));
      tptr+=sizeof(struct in6_addr);
       }
   }
#endif
   break;

    case LDP_TLV_COMMON_SESSION:
   sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t      Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
          EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
          (EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
          (EXTRACT_16BITS(tptr+6)&0x4000) ? "Enabled" : "Disabled"
          );
   break;

    case LDP_TLV_FEC:
        fec_type = *tptr;
   sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t      %s FEC (0x%02x)",
          tok2str(ldp_fec_values, "Unknown", fec_type),
          fec_type);

   tptr+=1;
   switch(fec_type) {

   case LDP_FEC_WILDCARD:
       break;
   case LDP_FEC_PREFIX:
       af = EXTRACT_16BITS(tptr);
       tptr+=2;
       if (af == AFNUM_INET) {
      i=decode_prefix4(tptr,buf,sizeof(buf));
      sprintf(&ArgusBuf[strlen(ArgusBuf)],": IPv4 prefix %s",buf);
       }
#ifdef INET6
       else if (af == AFNUM_INET6) {
      i=decode_prefix6(tptr,buf,sizeof(buf));
      sprintf(&ArgusBuf[strlen(ArgusBuf)],": IPv6 prefix %s",buf);
       }
#endif
       break;
   case LDP_FEC_HOSTADDRESS:
       break;
   case LDP_FEC_MARTINI_VC:
            if (!TTEST2(*tptr, 11))
                goto trunc;
            vc_info_len = *(tptr+2);

       sprintf(&ArgusBuf[strlen(ArgusBuf)],": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
         tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
         EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
                   EXTRACT_32BITS(tptr+3),
         EXTRACT_32BITS(tptr+7),
                   vc_info_len);

            if (vc_info_len == 0) /* infinite loop protection */
                break;

            tptr+=11;
            if (!TTEST2(*tptr, vc_info_len))
                goto trunc;

            while (vc_info_len > 2) {
                vc_info_tlv_type = *tptr;
                vc_info_tlv_len = *(tptr+1);
                if (vc_info_tlv_len < 2)
                    break;
                if (vc_info_len < vc_info_tlv_len)
                    break;

                sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t\tInterface Parameter: %s (0x%02x), len %u",
                       tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
                       vc_info_tlv_type,
                       vc_info_tlv_len);

                switch(vc_info_tlv_type) {
                case LDP_FEC_MARTINI_IFPARM_MTU:
                    sprintf(&ArgusBuf[strlen(ArgusBuf)],": %u",EXTRACT_16BITS(tptr+2));
                    break;

                case LDP_FEC_MARTINI_IFPARM_DESC:
                    sprintf(&ArgusBuf[strlen(ArgusBuf)],": ");
                    for (idx = 2; idx < vc_info_tlv_len; idx++)
                       sprintf(&ArgusBuf[strlen(ArgusBuf)],"%c", *(tptr+idx));
                    break;

                case LDP_FEC_MARTINI_IFPARM_VCCV:
                    sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t\t  Control Channels (0x%02x) = [%s]",
                           *(tptr+2),
                           bittok2str(ldp_fec_martini_ifparm_vccv_cc_values,"none",*(tptr+2)));
                    sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t\t  CV Types (0x%02x) = [%s]",
                           *(tptr+3),
                           bittok2str(ldp_fec_martini_ifparm_vccv_cv_values,"none",*(tptr+3)));
                    break;

                default:
                    print_unknown_data(tptr+2,"\n\t\t  ",vc_info_tlv_len-2);
                    break;
                }

                vc_info_len -= vc_info_tlv_len;
                tptr += vc_info_tlv_len;
            }
       break;
   }

   break;

    case LDP_TLV_GENERIC_LABEL:
   sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t      Label: %u", EXTRACT_32BITS(tptr) & 0xfffff);
   break;

    case LDP_TLV_STATUS:
   ui = EXTRACT_32BITS(tptr);
   tptr+=4;
   sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t      Status: 0x%02x, Flags: [%s and %s forward]",
          ui&0x3fffffff,
          ui&0x80000000 ? "Fatal error" : "Advisory Notification",
          ui&0x40000000 ? "do" : "don't");
   ui = EXTRACT_32BITS(tptr);
   tptr+=4;
   if (ui)
       sprintf(&ArgusBuf[strlen(ArgusBuf)],", causing Message ID: 0x%08x", ui);
   break;

    case LDP_TLV_FT_SESSION:
   ft_flags = EXTRACT_16BITS(tptr);
   sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t      Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
          ft_flags&0x8000 ? "" : "No ",
          ft_flags&0x8 ? "" : "Don't ",
          ft_flags&0x4 ? "" : "No ",
          ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
          ft_flags&0x1 ? "" : "Don't ");
   tptr+=4;
   ui = EXTRACT_32BITS(tptr);
   if (ui)
       sprintf(&ArgusBuf[strlen(ArgusBuf)],", Reconnect Timeout: %ums", ui);
   tptr+=4;
   ui = EXTRACT_32BITS(tptr);
   if (ui)
       sprintf(&ArgusBuf[strlen(ArgusBuf)],", Recovery Time: %ums", ui);
   break;


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

    case LDP_TLV_HOP_COUNT:
    case LDP_TLV_PATH_VECTOR:
    case LDP_TLV_ATM_LABEL:
    case LDP_TLV_FR_LABEL:
    case LDP_TLV_EXTD_STATUS:
    case LDP_TLV_RETURNED_PDU:
    case LDP_TLV_RETURNED_MSG:
    case LDP_TLV_ATM_SESSION_PARM:
    case LDP_TLV_FR_SESSION_PARM:
    case LDP_TLV_LABEL_REQUEST_MSG_ID:

    default:
        if (ArgusParser->vflag <= 1)
            print_unknown_data(tptr,"\n\t      ",tlv_tlen);
        break;
    }
    return(tlv_len+4); /* Type & Length fields not included */
 
trunc:
    sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t\t packet exceeded snapshot");
    return 0;
}

char *
ldp_print(register const u_char *pptr, register u_int len) {

    int processed;
    while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
        processed = ldp_msg_print(pptr);
        if (processed == 0)
            return ArgusBuf;
        len -= processed;
        pptr += processed;
    }

    return ArgusBuf;
}


int
ldp_msg_print(register const u_char *pptr) {

    const struct ldp_common_header *ldp_com_header;
    const struct ldp_msg_header *ldp_msg_header;
    const u_char *tptr,*msg_tptr;
    u_short tlen;
    u_short pdu_len,msg_len,msg_type,msg_tlen;
    int hexdump,processed;

    tptr=pptr;
    ldp_com_header = (const struct ldp_common_header *)pptr;
    TCHECK(*ldp_com_header);

    /*
     * Sanity checking of the header.
     */
    if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
   sprintf(&ArgusBuf[strlen(ArgusBuf)],"%sLDP version %u packet not supported",
               (ArgusParser->vflag < 1) ? "" : "\n\t",
               EXTRACT_16BITS(&ldp_com_header->version));
   return 0;
    }

    /* print the LSR-ID, label-space & length */
    pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
    sprintf(&ArgusBuf[strlen(ArgusBuf)],"%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
           (ArgusParser->vflag < 1) ? "" : "\n\t",
           ipaddr_string(&ldp_com_header->lsr_id),
           EXTRACT_16BITS(&ldp_com_header->label_space),
           pdu_len);

    /* bail out if non-verbose */ 
    if (ArgusParser->vflag < 1)
        return 0;

    /* ok they seem to want to know everything - lets fully decode it */
    tlen=pdu_len;

    tptr += sizeof(const struct ldp_common_header);
    tlen -= sizeof(const struct ldp_common_header)-4;   /* Type & Length fields not included */

    while(tlen>0) {
        /* did we capture enough for fully decoding the msg header ? */
        if (!TTEST2(*tptr, sizeof(struct ldp_msg_header)))
            goto trunc;

        ldp_msg_header = (const struct ldp_msg_header *)tptr;
        msg_len=EXTRACT_16BITS(ldp_msg_header->length);
        msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));

        /* FIXME vendor private / experimental check */
        sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t  %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
               tok2str(ldp_msg_values,
                       "Unknown",
                       msg_type),
               msg_type,
               msg_len,
               EXTRACT_32BITS(&ldp_msg_header->id),
               LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore");

        if (msg_len == 0) /* infinite loop protection */
            return 0;

        msg_tptr=tptr+sizeof(struct ldp_msg_header);
        msg_tlen=msg_len-sizeof(struct ldp_msg_header)+4; /* Type & Length fields not included */

        /* did we capture enough for fully decoding the message ? */
        if (!TTEST2(*tptr, msg_len))
            goto trunc;
        hexdump=FALSE;

        switch(msg_type) {
 
        case LDP_MSG_NOTIF:
        case LDP_MSG_HELLO:
        case LDP_MSG_INIT:
        case LDP_MSG_KEEPALIVE:
        case LDP_MSG_ADDRESS:
        case LDP_MSG_LABEL_MAPPING:
            while(msg_tlen >= 4) {
                processed = ldp_tlv_print(msg_tptr);
                if (processed == 0)
                    break;
                msg_tlen-=processed;
                msg_tptr+=processed;
            }
            break;

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

        case LDP_MSG_ADDRESS_WITHDRAW:
        case LDP_MSG_LABEL_REQUEST:
        case LDP_MSG_LABEL_WITHDRAW:
        case LDP_MSG_LABEL_RELEASE:
        case LDP_MSG_LABEL_ABORT_REQUEST:

        default:
            if (ArgusParser->vflag <= 1)
                print_unknown_data(msg_tptr,"\n\t  ",msg_tlen);
            break;
        }
        /* do we want to see an additionally hexdump ? */
        if (ArgusParser->vflag > 1 || hexdump==TRUE)
            print_unknown_data(tptr+sizeof(sizeof(struct ldp_msg_header)),"\n\t  ",
                               msg_len);

        tptr += msg_len+4;
        tlen -= msg_len+4;
    }
    return pdu_len+4;
trunc:
    sprintf(&ArgusBuf[strlen(ArgusBuf)],"\n\t\t packet exceeded snapshot");
    return 0;
}

