* Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997

/*
* Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* 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, (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, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* 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.
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-decnet.c,v 1.12 2024/09/02 16:15:31 christos Exp $");
#endif

/* \summary: DECnet printer */

#include <config.h>

#include "netdissect-stdinc.h"

#include <stdio.h>
#include <stdlib.h>

#define ND_LONGJMP_FROM_TCHECK
#include "netdissect.h"
#include "extract.h"
#include "addrtoname.h"

#ifndef _WIN32
typedef nd_uint8_t byte; /* single byte field */
#else
/*
* the keyword 'byte' generates conflicts in Windows
*/
typedef nd_uint8_t Byte; /* single byte field */
#define byte Byte
#endif /* _WIN32 */
typedef nd_uint16_t word; /* 2 byte field */
typedef nd_uint32_t longword; /* 4 bytes field */

/*
* Definitions for DECNET Phase IV protocol headers
*/
typedef union {
nd_mac_addr dne_addr; /* full Ethernet address */
struct {
nd_byte dne_hiord[4]; /* DECnet HIORD prefix */
nd_byte dne_nodeaddr[2]; /* DECnet node address */
} dne_remote;
} etheraddr; /* Ethernet address */

#define HIORD 0x000400aa /* high 32-bits of address (swapped) */

#define AREAMASK 0176000 /* mask for area field */
#define AREASHIFT 10 /* bit-offset for area field */
#define NODEMASK 01777 /* mask for node address field */

/*
* Define long and short header formats.
*/
struct shorthdr
{
byte sh_flags; /* route flags */
word sh_dst; /* destination node address */
word sh_src; /* source node address */
byte sh_visits; /* visit count */
};

struct longhdr
{
byte lg_flags; /* route flags */
byte lg_darea; /* destination area (reserved) */
byte lg_dsarea; /* destination subarea (reserved) */
etheraddr lg_dst; /* destination id */
byte lg_sarea; /* source area (reserved) */
byte lg_ssarea; /* source subarea (reserved) */
etheraddr lg_src; /* source id */
byte lg_nextl2; /* next level 2 router (reserved) */
byte lg_visits; /* visit count */
byte lg_service; /* service class (reserved) */
byte lg_pt; /* protocol type (reserved) */
};

union routehdr
{
struct shorthdr rh_short; /* short route header */
struct longhdr rh_long; /* long route header */
};

/*
* Define the values of various fields in the protocol messages.
*
* 1. Data packet formats.
*/
#define RMF_MASK 7 /* mask for message type */
#define RMF_SHORT 2 /* short message format */
#define RMF_LONG 6 /* long message format */
#ifndef RMF_RQR
#define RMF_RQR 010 /* request return to sender */
#define RMF_RTS 020 /* returning to sender */
#define RMF_IE 040 /* intra-ethernet packet */
#endif /* RMR_RQR */
#define RMF_FVER 0100 /* future version flag */
#define RMF_PAD 0200 /* pad field */
#define RMF_PADMASK 0177 /* pad field mask */

#define VIS_MASK 077 /* visit field mask */

/*
* 2. Control packet formats.
*/
#define RMF_CTLMASK 017 /* mask for message type */
#define RMF_CTLMSG 01 /* control message indicator */
#define RMF_INIT 01 /* initialization message */
#define RMF_VER 03 /* verification message */
#define RMF_TEST 05 /* hello and test message */
#define RMF_L1ROUT 07 /* level 1 routing message */
#define RMF_L2ROUT 011 /* level 2 routing message */
#define RMF_RHELLO 013 /* router hello message */
#define RMF_EHELLO 015 /* endnode hello message */

#define TI_L2ROUT 01 /* level 2 router */
#define TI_L1ROUT 02 /* level 1 router */
#define TI_ENDNODE 03 /* endnode */
#define TI_VERIF 04 /* verification required */
#define TI_BLOCK 010 /* blocking requested */

#define VE_VERS 2 /* version number (2) */
#define VE_ECO 0 /* ECO number */
#define VE_UECO 0 /* user ECO number (0) */

#define P3_VERS 1 /* phase III version number (1) */
#define P3_ECO 3 /* ECO number (3) */
#define P3_UECO 0 /* user ECO number (0) */

#define II_L2ROUT 01 /* level 2 router */
#define II_L1ROUT 02 /* level 1 router */
#define II_ENDNODE 03 /* endnode */
#define II_VERIF 04 /* verification required */
#define II_NOMCAST 040 /* no multicast traffic accepted */
#define II_BLOCK 0100 /* blocking requested */
#define II_TYPEMASK 03 /* mask for node type */

#define TESTDATA 0252 /* test data bytes */
#define TESTLEN 1 /* length of transmitted test data */

/*
* Define control message formats.
*/
struct initmsg /* initialization message */
{
byte in_flags; /* route flags */
word in_src; /* source node address */
byte in_info; /* routing layer information */
word in_blksize; /* maximum data link block size */
byte in_vers; /* version number */
byte in_eco; /* ECO number */
byte in_ueco; /* user ECO number */
word in_hello; /* hello timer */
byte in_rsvd; /* reserved image field */
};

struct verifmsg /* verification message */
{
byte ve_flags; /* route flags */
word ve_src; /* source node address */
byte ve_fcnval; /* function value image field */
};

struct testmsg /* hello and test message */
{
byte te_flags; /* route flags */
word te_src; /* source node address */
byte te_data; /* test data image field */
};

struct l1rout /* level 1 routing message */
{
byte r1_flags; /* route flags */
word r1_src; /* source node address */
byte r1_rsvd; /* reserved field */
};

struct l2rout /* level 2 routing message */
{
byte r2_flags; /* route flags */
word r2_src; /* source node address */
byte r2_rsvd; /* reserved field */
};

struct rhellomsg /* router hello message */
{
byte rh_flags; /* route flags */
byte rh_vers; /* version number */
byte rh_eco; /* ECO number */
byte rh_ueco; /* user ECO number */
etheraddr rh_src; /* source id */
byte rh_info; /* routing layer information */
word rh_blksize; /* maximum data link block size */
byte rh_priority; /* router's priority */
byte rh_area; /* reserved */
word rh_hello; /* hello timer */
byte rh_mpd; /* reserved */
};

struct ehellomsg /* endnode hello message */
{
byte eh_flags; /* route flags */
byte eh_vers; /* version number */
byte eh_eco; /* ECO number */
byte eh_ueco; /* user ECO number */
etheraddr eh_src; /* source id */
byte eh_info; /* routing layer information */
word eh_blksize; /* maximum data link block size */
byte eh_area; /* area (reserved) */
byte eh_seed[8]; /* verification seed */
etheraddr eh_router; /* designated router */
word eh_hello; /* hello timer */
byte eh_mpd; /* (reserved) */
byte eh_data; /* test data image field */
};

union controlmsg
{
struct initmsg cm_init; /* initialization message */
struct verifmsg cm_ver; /* verification message */
struct testmsg cm_test; /* hello and test message */
struct l1rout cm_l1rou; /* level 1 routing message */
struct l2rout cm_l2rout; /* level 2 routing message */
struct rhellomsg cm_rhello; /* router hello message */
struct ehellomsg cm_ehello; /* endnode hello message */
};

/* Macros for decoding routing-info fields */
#define RI_COST(x) ((x)&0777)
#define RI_HOPS(x) (((x)>>10)&037)

/*
* NSP protocol fields and values.
*/

#define NSP_TYPEMASK 014 /* mask to isolate type code */
#define NSP_SUBMASK 0160 /* mask to isolate subtype code */
#define NSP_SUBSHFT 4 /* shift to move subtype code */

#define MFT_DATA 0 /* data message */
#define MFT_ACK 04 /* acknowledgement message */
#define MFT_CTL 010 /* control message */

#define MFS_ILS 020 /* data or I/LS indicator */
#define MFS_BOM 040 /* beginning of message (data) */
#define MFS_MOM 0 /* middle of message (data) */
#define MFS_EOM 0100 /* end of message (data) */
#define MFS_INT 040 /* interrupt message */

#define MFS_DACK 0 /* data acknowledgement */
#define MFS_IACK 020 /* I/LS acknowledgement */
#define MFS_CACK 040 /* connect acknowledgement */

#define MFS_NOP 0 /* no operation */
#define MFS_CI 020 /* connect initiate */
#define MFS_CC 040 /* connect confirm */
#define MFS_DI 060 /* disconnect initiate */
#define MFS_DC 0100 /* disconnect confirm */
#define MFS_RCI 0140 /* retransmitted connect initiate */

#define SGQ_ACK 0100000 /* ack */
#define SGQ_NAK 0110000 /* negative ack */
#define SGQ_OACK 0120000 /* other channel ack */
#define SGQ_ONAK 0130000 /* other channel negative ack */
#define SGQ_MASK 07777 /* mask to isolate seq # */
#define SGQ_OTHER 020000 /* other channel qualifier */
#define SGQ_DELAY 010000 /* ack delay flag */

#define SGQ_EOM 0100000 /* pseudo flag for end-of-message */

#define LSM_MASK 03 /* mask for modifier field */
#define LSM_NOCHANGE 0 /* no change */
#define LSM_DONOTSEND 1 /* do not send data */
#define LSM_SEND 2 /* send data */

#define LSI_MASK 014 /* mask for interpretation field */
#define LSI_DATA 0 /* data segment or message count */
#define LSI_INTR 4 /* interrupt request count */
#define LSI_INTM 0377 /* funny marker for int. message */

#define COS_MASK 014 /* mask for flow control field */
#define COS_NONE 0 /* no flow control */
#define COS_SEGMENT 04 /* segment flow control */
#define COS_MESSAGE 010 /* message flow control */
#define COS_DEFAULT 1 /* default value for field */

#define COI_MASK 3 /* mask for version field */
#define COI_32 0 /* version 3.2 */
#define COI_31 1 /* version 3.1 */
#define COI_40 2 /* version 4.0 */
#define COI_41 3 /* version 4.1 */

#define MNU_MASK 140 /* mask for session control version */
#define MNU_10 000 /* session V1.0 */
#define MNU_20 040 /* session V2.0 */
#define MNU_ACCESS 1 /* access control present */
#define MNU_USRDATA 2 /* user data field present */
#define MNU_INVKPROXY 4 /* invoke proxy field present */
#define MNU_UICPROXY 8 /* use uic-based proxy */

#define DC_NORESOURCES 1 /* no resource reason code */
#define DC_NOLINK 41 /* no link terminate reason code */
#define DC_COMPLETE 42 /* disconnect complete reason code */

#define DI_NOERROR 0 /* user disconnect */
#define DI_SHUT 3 /* node is shutting down */
#define DI_NOUSER 4 /* destination end user does not exist */
#define DI_INVDEST 5 /* invalid end user destination */
#define DI_REMRESRC 6 /* insufficient remote resources */
#define DI_TPA 8 /* third party abort */
#define DI_PROTOCOL 7 /* protocol error discovered */
#define DI_ABORT 9 /* user abort */
#define DI_LOCALRESRC 32 /* insufficient local resources */
#define DI_REMUSERRESRC 33 /* insufficient remote user resources */
#define DI_BADACCESS 34 /* bad access control information */
#define DI_BADACCNT 36 /* bad ACCOUNT information */
#define DI_CONNECTABORT 38 /* connect request cancelled */
#define DI_TIMEDOUT 38 /* remote node or user crashed */
#define DI_UNREACHABLE 39 /* local timers expired due to ... */
#define DI_BADIMAGE 43 /* bad image data in connect */
#define DI_SERVMISMATCH 54 /* cryptographic service mismatch */

#define UC_OBJREJECT 0 /* object rejected connect */
#define UC_USERDISCONNECT 0 /* user disconnect */
#define UC_RESOURCES 1 /* insufficient resources (local or remote) */
#define UC_NOSUCHNODE 2 /* unrecognized node name */
#define UC_REMOTESHUT 3 /* remote node shutting down */
#define UC_NOSUCHOBJ 4 /* unrecognized object */
#define UC_INVOBJFORMAT 5 /* invalid object name format */
#define UC_OBJTOOBUSY 6 /* object too busy */
#define UC_NETWORKABORT 8 /* network abort */
#define UC_USERABORT 9 /* user abort */
#define UC_INVNODEFORMAT 10 /* invalid node name format */
#define UC_LOCALSHUT 11 /* local node shutting down */
#define UC_ACCESSREJECT 34 /* invalid access control information */
#define UC_NORESPONSE 38 /* no response from object */
#define UC_UNREACHABLE 39 /* node unreachable */

/*
* NSP message formats.
*/
struct nsphdr /* general nsp header */
{
byte nh_flags; /* message flags */
word nh_dst; /* destination link address */
word nh_src; /* source link address */
};

struct seghdr /* data segment header */
{
byte sh_flags; /* message flags */
word sh_dst; /* destination link address */
word sh_src; /* source link address */
word sh_seq[3]; /* sequence numbers */
};

struct minseghdr /* minimum data segment header */
{
byte ms_flags; /* message flags */
word ms_dst; /* destination link address */
word ms_src; /* source link address */
word ms_seq; /* sequence number */
};

struct lsmsg /* link service message (after hdr) */
{
byte ls_lsflags; /* link service flags */
byte ls_fcval; /* flow control value */
};

struct ackmsg /* acknowledgement message */
{
byte ak_flags; /* message flags */
word ak_dst; /* destination link address */
word ak_src; /* source link address */
word ak_acknum[2]; /* acknowledgement numbers */
};

struct minackmsg /* minimum acknowledgement message */
{
byte mk_flags; /* message flags */
word mk_dst; /* destination link address */
word mk_src; /* source link address */
word mk_acknum; /* acknowledgement number */
};

struct ciackmsg /* connect acknowledgement message */
{
byte ck_flags; /* message flags */
word ck_dst; /* destination link address */
};

struct cimsg /* connect initiate message */
{
byte ci_flags; /* message flags */
word ci_dst; /* destination link address (0) */
word ci_src; /* source link address */
byte ci_services; /* requested services */
byte ci_info; /* information */
word ci_segsize; /* maximum segment size */
};

struct ccmsg /* connect confirm message */
{
byte cc_flags; /* message flags */
word cc_dst; /* destination link address */
word cc_src; /* source link address */
byte cc_services; /* requested services */
byte cc_info; /* information */
word cc_segsize; /* maximum segment size */
byte cc_optlen; /* optional data length */
};

struct cnmsg /* generic connect message */
{
byte cn_flags; /* message flags */
word cn_dst; /* destination link address */
word cn_src; /* source link address */
byte cn_services; /* requested services */
byte cn_info; /* information */
word cn_segsize; /* maximum segment size */
};

struct dimsg /* disconnect initiate message */
{
byte di_flags; /* message flags */
word di_dst; /* destination link address */
word di_src; /* source link address */
word di_reason; /* reason code */
byte di_optlen; /* optional data length */
};

struct dcmsg /* disconnect confirm message */
{
byte dc_flags; /* message flags */
word dc_dst; /* destination link address */
word dc_src; /* source link address */
word dc_reason; /* reason code */
};

/* Forwards */
static int print_decnet_ctlmsg(netdissect_options *, const union routehdr *, u_int, u_int);
static void print_t_info(netdissect_options *, u_int);
static void print_l1_routes(netdissect_options *, const u_char *, u_int);
static void print_l2_routes(netdissect_options *, const u_char *, u_int);
static void print_i_info(netdissect_options *, u_int);
static void print_elist(const u_char *, u_int);
static int print_nsp(netdissect_options *, const u_char *, u_int);
static void print_reason(netdissect_options *, u_int);

void
decnet_print(netdissect_options *ndo,
const u_char *ap, u_int length,
u_int caplen)
{
const union routehdr *rhp;
u_int mflags;
uint16_t dst, src;
u_int hops;
u_int nsplen, pktlen;
const u_char *nspp;

ndo->ndo_protocol = "decnet";
if (length < sizeof(struct shorthdr)) {
ND_PRINT(" (length %u < %zu)", length, sizeof(struct shorthdr));
goto invalid;
}

pktlen = GET_LE_U_2(ap);
if (pktlen < sizeof(struct shorthdr)) {
ND_PRINT(" (pktlen %u < %zu)", pktlen, sizeof(struct shorthdr));
goto invalid;
}
if (pktlen > length) {
ND_PRINT(" (pktlen %u > %u)", pktlen, length);
goto invalid;
}
length = pktlen;

rhp = (const union routehdr *)(ap + sizeof(short));
mflags = GET_U_1(rhp->rh_short.sh_flags);

if (mflags & RMF_PAD) {
/* pad bytes of some sort in front of message */
u_int padlen = mflags & RMF_PADMASK;
if (ndo->ndo_vflag)
ND_PRINT("[pad:%u] ", padlen);
if (length < padlen + 2) {
ND_PRINT(" (length %u < %u)", length, padlen + 2);
goto invalid;
}
ND_TCHECK_LEN(ap + sizeof(short), padlen);
ap += padlen;
length -= padlen;
caplen -= padlen;
rhp = (const union routehdr *)(ap + sizeof(short));
mflags = GET_U_1(rhp->rh_short.sh_flags);
}

if (mflags & RMF_FVER) {
ND_PRINT("future-version-decnet");
ND_DEFAULTPRINT(ap, ND_MIN(length, caplen));
return;
}

/* is it a control message? */
if (mflags & RMF_CTLMSG) {
if (!print_decnet_ctlmsg(ndo, rhp, length, caplen))
goto invalid;
return;
}

switch (mflags & RMF_MASK) {
case RMF_LONG:
if (length < sizeof(struct longhdr)) {
ND_PRINT(" (length %u < %zu)", length, sizeof(struct longhdr));
goto invalid;
}
ND_TCHECK_SIZE(&rhp->rh_long);
dst =
GET_LE_U_2(rhp->rh_long.lg_dst.dne_remote.dne_nodeaddr);
src =
GET_LE_U_2(rhp->rh_long.lg_src.dne_remote.dne_nodeaddr);
hops = GET_U_1(rhp->rh_long.lg_visits);
nspp = ap + sizeof(short) + sizeof(struct longhdr);
nsplen = length - sizeof(struct longhdr);
break;
case RMF_SHORT:
dst = GET_LE_U_2(rhp->rh_short.sh_dst);
src = GET_LE_U_2(rhp->rh_short.sh_src);
hops = (GET_U_1(rhp->rh_short.sh_visits) & VIS_MASK)+1;
nspp = ap + sizeof(short) + sizeof(struct shorthdr);
nsplen = length - sizeof(struct shorthdr);
break;
default:
ND_PRINT("unknown message flags under mask");
ND_DEFAULTPRINT((const u_char *)ap, ND_MIN(length, caplen));
return;
}

ND_PRINT("%s > %s %u ",
dnaddr_string(ndo, src), dnaddr_string(ndo, dst), pktlen);
if (ndo->ndo_vflag) {
if (mflags & RMF_RQR)
ND_PRINT("RQR ");
if (mflags & RMF_RTS)
ND_PRINT("RTS ");
if (mflags & RMF_IE)
ND_PRINT("IE ");
ND_PRINT("%u hops ", hops);
}

if (!print_nsp(ndo, nspp, nsplen))
goto invalid;
return;

invalid:
nd_print_invalid(ndo);
}

static int
print_decnet_ctlmsg(netdissect_options *ndo,
const union routehdr *rhp, u_int length,
u_int caplen)
{
/* Our caller has already checked for mflags */
u_int mflags = GET_U_1(rhp->rh_short.sh_flags);
const union controlmsg *cmp = (const union controlmsg *)rhp;
uint16_t src, dst;
u_int info, blksize, eco, ueco, hello, other, vers;
u_int priority;
const u_char *rhpx = (const u_char *)rhp;

switch (mflags & RMF_CTLMASK) {
case RMF_INIT:
ND_PRINT("init ");
if (length < sizeof(struct initmsg))
goto invalid;
ND_TCHECK_SIZE(&cmp->cm_init);
src = GET_LE_U_2(cmp->cm_init.in_src);
info = GET_U_1(cmp->cm_init.in_info);
blksize = GET_LE_U_2(cmp->cm_init.in_blksize);
vers = GET_U_1(cmp->cm_init.in_vers);
eco = GET_U_1(cmp->cm_init.in_eco);
ueco = GET_U_1(cmp->cm_init.in_ueco);
hello = GET_LE_U_2(cmp->cm_init.in_hello);
print_t_info(ndo, info);
ND_PRINT("src %sblksize %u vers %u eco %u ueco %u hello %u",
dnaddr_string(ndo, src), blksize, vers, eco, ueco,
hello);
break;
case RMF_VER:
ND_PRINT("verification ");
if (length < sizeof(struct verifmsg))
goto invalid;
src = GET_LE_U_2(cmp->cm_ver.ve_src);
other = GET_U_1(cmp->cm_ver.ve_fcnval);
ND_PRINT("src %s fcnval %o", dnaddr_string(ndo, src), other);
break;
case RMF_TEST:
ND_PRINT("test ");
if (length < sizeof(struct testmsg))
goto invalid;
src = GET_LE_U_2(cmp->cm_test.te_src);
other = GET_U_1(cmp->cm_test.te_data);
ND_PRINT("src %s data %o", dnaddr_string(ndo, src), other);
break;
case RMF_L1ROUT:
ND_PRINT("lev-1-routing ");
if (length < sizeof(struct l1rout))
goto invalid;
ND_TCHECK_SIZE(&cmp->cm_l1rou);
src = GET_LE_U_2(cmp->cm_l1rou.r1_src);
ND_PRINT("src %s ", dnaddr_string(ndo, src));
print_l1_routes(ndo, &(rhpx[sizeof(struct l1rout)]),
length - sizeof(struct l1rout));
break;
case RMF_L2ROUT:
ND_PRINT("lev-2-routing ");
if (length < sizeof(struct l2rout))
goto invalid;
ND_TCHECK_SIZE(&cmp->cm_l2rout);
src = GET_LE_U_2(cmp->cm_l2rout.r2_src);
ND_PRINT("src %s ", dnaddr_string(ndo, src));
print_l2_routes(ndo, &(rhpx[sizeof(struct l2rout)]),
length - sizeof(struct l2rout));
break;
case RMF_RHELLO:
ND_PRINT("router-hello ");
if (length < sizeof(struct rhellomsg))
goto invalid;
ND_TCHECK_SIZE(&cmp->cm_rhello);
vers = GET_U_1(cmp->cm_rhello.rh_vers);
eco = GET_U_1(cmp->cm_rhello.rh_eco);
ueco = GET_U_1(cmp->cm_rhello.rh_ueco);
src =
GET_LE_U_2(cmp->cm_rhello.rh_src.dne_remote.dne_nodeaddr);
info = GET_U_1(cmp->cm_rhello.rh_info);
blksize = GET_LE_U_2(cmp->cm_rhello.rh_blksize);
priority = GET_U_1(cmp->cm_rhello.rh_priority);
hello = GET_LE_U_2(cmp->cm_rhello.rh_hello);
print_i_info(ndo, info);
ND_PRINT("vers %u eco %u ueco %u src %s blksize %u pri %u hello %u",
vers, eco, ueco, dnaddr_string(ndo, src),
blksize, priority, hello);
print_elist(&(rhpx[sizeof(struct rhellomsg)]),
length - sizeof(struct rhellomsg));
break;
case RMF_EHELLO:
ND_PRINT("endnode-hello ");
if (length < sizeof(struct ehellomsg))
goto invalid;
vers = GET_U_1(cmp->cm_ehello.eh_vers);
eco = GET_U_1(cmp->cm_ehello.eh_eco);
ueco = GET_U_1(cmp->cm_ehello.eh_ueco);
src =
GET_LE_U_2(cmp->cm_ehello.eh_src.dne_remote.dne_nodeaddr);
info = GET_U_1(cmp->cm_ehello.eh_info);
blksize = GET_LE_U_2(cmp->cm_ehello.eh_blksize);
/*seed*/
dst =
GET_LE_U_2(cmp->cm_ehello.eh_router.dne_remote.dne_nodeaddr);
hello = GET_LE_U_2(cmp->cm_ehello.eh_hello);
other = GET_U_1(cmp->cm_ehello.eh_data);
print_i_info(ndo, info);
ND_PRINT("vers %u eco %u ueco %u src %s blksize %u rtr %s hello %u data %o",
vers, eco, ueco, dnaddr_string(ndo, src),
blksize, dnaddr_string(ndo, dst), hello, other);
break;

default:
ND_PRINT("unknown control message");
ND_DEFAULTPRINT((const u_char *)rhp, ND_MIN(length, caplen));
break;
}
return (1);

invalid:
return (0);
}

static void
print_t_info(netdissect_options *ndo,
u_int info)
{
u_int ntype = info & 3;
switch (ntype) {
case 0: ND_PRINT("reserved-ntype? "); break;
case TI_L2ROUT: ND_PRINT("l2rout "); break;
case TI_L1ROUT: ND_PRINT("l1rout "); break;
case TI_ENDNODE: ND_PRINT("endnode "); break;
}
if (info & TI_VERIF)
ND_PRINT("verif ");
if (info & TI_BLOCK)
ND_PRINT("blo ");
}

static void
print_l1_routes(netdissect_options *ndo,
const u_char *rp, u_int len)
{
u_int count;
u_int id;
u_int info;

/* The last short is a checksum */
while (len > (3 * sizeof(short))) {
ND_TCHECK_LEN(rp, 3 * sizeof(short));
count = GET_LE_U_2(rp);
if (count > 1024)
return; /* seems to be bogus from here on */
rp += sizeof(short);
len -= sizeof(short);
id = GET_LE_U_2(rp);
rp += sizeof(short);
len -= sizeof(short);
info = GET_LE_U_2(rp);
rp += sizeof(short);
len -= sizeof(short);
ND_PRINT("{ids %u-%u cost %u hops %u} ", id, id + count,
RI_COST(info), RI_HOPS(info));
}
}

static void
print_l2_routes(netdissect_options *ndo,
const u_char *rp, u_int len)
{
u_int count;
u_int area;
u_int info;

/* The last short is a checksum */
while (len > (3 * sizeof(short))) {
ND_TCHECK_LEN(rp, 3 * sizeof(short));
count = GET_LE_U_2(rp);
if (count > 1024)
return; /* seems to be bogus from here on */
rp += sizeof(short);
len -= sizeof(short);
area = GET_LE_U_2(rp);
rp += sizeof(short);
len -= sizeof(short);
info = GET_LE_U_2(rp);
rp += sizeof(short);
len -= sizeof(short);
ND_PRINT("{areas %u-%u cost %u hops %u} ", area, area + count,
RI_COST(info), RI_HOPS(info));
}
}

static void
print_i_info(netdissect_options *ndo,
u_int info)
{
u_int ntype = info & II_TYPEMASK;
switch (ntype) {
case 0: ND_PRINT("reserved-ntype? "); break;
case II_L2ROUT: ND_PRINT("l2rout "); break;
case II_L1ROUT: ND_PRINT("l1rout "); break;
case II_ENDNODE: ND_PRINT("endnode "); break;
}
if (info & II_VERIF)
ND_PRINT("verif ");
if (info & II_NOMCAST)
ND_PRINT("nomcast ");
if (info & II_BLOCK)
ND_PRINT("blo ");
}

static void
print_elist(const u_char *elp _U_, u_int len _U_)
{
/* Not enough examples available for me to debug this */
}

static int
print_nsp(netdissect_options *ndo,
const u_char *nspp, u_int nsplen)
{
const struct nsphdr *nsphp = (const struct nsphdr *)nspp;
u_int dst, src, flags;

if (nsplen < sizeof(struct nsphdr)) {
ND_PRINT(" (nsplen %u < %zu)", nsplen, sizeof(struct nsphdr));
goto invalid;
}
flags = GET_U_1(nsphp->nh_flags);
dst = GET_LE_U_2(nsphp->nh_dst);
src = GET_LE_U_2(nsphp->nh_src);

switch (flags & NSP_TYPEMASK) {
case MFT_DATA:
switch (flags & NSP_SUBMASK) {
case MFS_BOM:
case MFS_MOM:
case MFS_EOM:
case MFS_BOM+MFS_EOM:
ND_PRINT("data %u>%u ", src, dst);
{
const struct seghdr *shp = (const struct seghdr *)nspp;
u_int ack;
u_int data_off = sizeof(struct minseghdr);

if (nsplen < data_off)
goto invalid;
ack = GET_LE_U_2(shp->sh_seq[0]);
if (ack & SGQ_ACK) { /* acknum field */
if ((ack & SGQ_NAK) == SGQ_NAK)
ND_PRINT("nak %u ", ack & SGQ_MASK);
else
ND_PRINT("ack %u ", ack & SGQ_MASK);
data_off += sizeof(short);
if (nsplen < data_off)
goto invalid;
ack = GET_LE_U_2(shp->sh_seq[1]);
if (ack & SGQ_OACK) { /* ackoth field */
if ((ack & SGQ_ONAK) == SGQ_ONAK)
ND_PRINT("onak %u ", ack & SGQ_MASK);
else
ND_PRINT("oack %u ", ack & SGQ_MASK);
data_off += sizeof(short);
if (nsplen < data_off)
goto invalid;
ack = GET_LE_U_2(shp->sh_seq[2]);
}
}
ND_PRINT("seg %u ", ack & SGQ_MASK);
}
break;
case MFS_ILS+MFS_INT:
ND_PRINT("intr ");
{
const struct seghdr *shp = (const struct seghdr *)nspp;
u_int ack;
u_int data_off = sizeof(struct minseghdr);

if (nsplen < data_off)
goto invalid;
ack = GET_LE_U_2(shp->sh_seq[0]);
if (ack & SGQ_ACK) { /* acknum field */
if ((ack & SGQ_NAK) == SGQ_NAK)
ND_PRINT("nak %u ", ack & SGQ_MASK);
else
ND_PRINT("ack %u ", ack & SGQ_MASK);
data_off += sizeof(short);
if (nsplen < data_off)
goto invalid;
ack = GET_LE_U_2(shp->sh_seq[1]);
if (ack & SGQ_OACK) { /* ackdat field */
if ((ack & SGQ_ONAK) == SGQ_ONAK)
ND_PRINT("nakdat %u ", ack & SGQ_MASK);
else
ND_PRINT("ackdat %u ", ack & SGQ_MASK);
data_off += sizeof(short);
if (nsplen < data_off)
goto invalid;
ack = GET_LE_U_2(shp->sh_seq[2]);
}
}
ND_PRINT("seg %u ", ack & SGQ_MASK);
}
break;
case MFS_ILS:
ND_PRINT("link-service %u>%u ", src, dst);
{
const struct seghdr *shp = (const struct seghdr *)nspp;
const struct lsmsg *lsmp =
(const struct lsmsg *)(nspp + sizeof(struct seghdr));
u_int ack;
u_int lsflags, fcval;

if (nsplen < sizeof(struct seghdr) + sizeof(struct lsmsg))
goto invalid;
ack = GET_LE_U_2(shp->sh_seq[0]);
if (ack & SGQ_ACK) { /* acknum field */
if ((ack & SGQ_NAK) == SGQ_NAK)
ND_PRINT("nak %u ", ack & SGQ_MASK);
else
ND_PRINT("ack %u ", ack & SGQ_MASK);
ack = GET_LE_U_2(shp->sh_seq[1]);
if (ack & SGQ_OACK) { /* ackdat field */
if ((ack & SGQ_ONAK) == SGQ_ONAK)
ND_PRINT("nakdat %u ", ack & SGQ_MASK);
else
ND_PRINT("ackdat %u ", ack & SGQ_MASK);
ack = GET_LE_U_2(shp->sh_seq[2]);
}
}
ND_PRINT("seg %u ", ack & SGQ_MASK);
lsflags = GET_U_1(lsmp->ls_lsflags);
fcval = GET_U_1(lsmp->ls_fcval);
switch (lsflags & LSI_MASK) {
case LSI_DATA:
ND_PRINT("dat seg count %u ", fcval);
switch (lsflags & LSM_MASK) {
case LSM_NOCHANGE:
break;
case LSM_DONOTSEND:
ND_PRINT("donotsend-data ");
break;
case LSM_SEND:
ND_PRINT("send-data ");
break;
default:
ND_PRINT("reserved-fcmod? %x", lsflags);
break;
}
break;
case LSI_INTR:
ND_PRINT("intr req count %u ", fcval);
break;
default:
ND_PRINT("reserved-fcval-int? %x", lsflags);
break;
}
}
break;
default:
ND_PRINT("reserved-subtype? %x %u > %u", flags, src, dst);
break;
}
break;
case MFT_ACK:
switch (flags & NSP_SUBMASK) {
case MFS_DACK:
ND_PRINT("data-ack %u>%u ", src, dst);
{
const struct ackmsg *amp = (const struct ackmsg *)nspp;
u_int ack;

if (nsplen < sizeof(struct ackmsg))
goto invalid;
ND_TCHECK_SIZE(amp);
ack = GET_LE_U_2(amp->ak_acknum[0]);
if (ack & SGQ_ACK) { /* acknum field */
if ((ack & SGQ_NAK) == SGQ_NAK)
ND_PRINT("nak %u ", ack & SGQ_MASK);
else
ND_PRINT("ack %u ", ack & SGQ_MASK);
ack = GET_LE_U_2(amp->ak_acknum[1]);
if (ack & SGQ_OACK) { /* ackoth field */
if ((ack & SGQ_ONAK) == SGQ_ONAK)
ND_PRINT("onak %u ", ack & SGQ_MASK);
else
ND_PRINT("oack %u ", ack & SGQ_MASK);
}
}
}
break;
case MFS_IACK:
ND_PRINT("ils-ack %u>%u ", src, dst);
{
const struct ackmsg *amp = (const struct ackmsg *)nspp;
u_int ack;

if (nsplen < sizeof(struct ackmsg))
goto invalid;
ND_TCHECK_SIZE(amp);
ack = GET_LE_U_2(amp->ak_acknum[0]);
if (ack & SGQ_ACK) { /* acknum field */
if ((ack & SGQ_NAK) == SGQ_NAK)
ND_PRINT("nak %u ", ack & SGQ_MASK);
else
ND_PRINT("ack %u ", ack & SGQ_MASK);
ack = GET_LE_U_2(amp->ak_acknum[1]);
if (ack & SGQ_OACK) { /* ackdat field */
if ((ack & SGQ_ONAK) == SGQ_ONAK)
ND_PRINT("nakdat %u ", ack & SGQ_MASK);
else
ND_PRINT("ackdat %u ", ack & SGQ_MASK);
}
}
}
break;
case MFS_CACK:
ND_PRINT("conn-ack %u", dst);
break;
default:
ND_PRINT("reserved-acktype? %x %u > %u", flags, src, dst);
break;
}
break;
case MFT_CTL:
switch (flags & NSP_SUBMASK) {
case MFS_CI:
case MFS_RCI:
if ((flags & NSP_SUBMASK) == MFS_CI)
ND_PRINT("conn-initiate ");
else
ND_PRINT("retrans-conn-initiate ");
ND_PRINT("%u>%u ", src, dst);
{
const struct cimsg *cimp = (const struct cimsg *)nspp;
u_int services, info, segsize;

if (nsplen < sizeof(struct cimsg))
goto invalid;
services = GET_U_1(cimp->ci_services);
info = GET_U_1(cimp->ci_info);
segsize = GET_LE_U_2(cimp->ci_segsize);

switch (services & COS_MASK) {
case COS_NONE:
break;
case COS_SEGMENT:
ND_PRINT("seg ");
break;
case COS_MESSAGE:
ND_PRINT("msg ");
break;
}
switch (info & COI_MASK) {
case COI_32:
ND_PRINT("ver 3.2 ");
break;
case COI_31:
ND_PRINT("ver 3.1 ");
break;
case COI_40:
ND_PRINT("ver 4.0 ");
break;
case COI_41:
ND_PRINT("ver 4.1 ");
break;
}
ND_PRINT("segsize %u ", segsize);
}
break;
case MFS_CC:
ND_PRINT("conn-confirm %u>%u ", src, dst);
{
const struct ccmsg *ccmp = (const struct ccmsg *)nspp;
u_int services, info;
u_int segsize, optlen;

if (nsplen < sizeof(struct ccmsg))
goto invalid;
services = GET_U_1(ccmp->cc_services);
info = GET_U_1(ccmp->cc_info);
segsize = GET_LE_U_2(ccmp->cc_segsize);
optlen = GET_U_1(ccmp->cc_optlen);

switch (services & COS_MASK) {
case COS_NONE:
break;
case COS_SEGMENT:
ND_PRINT("seg ");
break;
case COS_MESSAGE:
ND_PRINT("msg ");
break;
}
switch (info & COI_MASK) {
case COI_32:
ND_PRINT("ver 3.2 ");
break;
case COI_31:
ND_PRINT("ver 3.1 ");
break;
case COI_40:
ND_PRINT("ver 4.0 ");
break;
case COI_41:
ND_PRINT("ver 4.1 ");
break;
}
ND_PRINT("segsize %u ", segsize);
if (optlen) {
ND_PRINT("optlen %u ", optlen);
}
}
break;
case MFS_DI:
ND_PRINT("disconn-initiate %u>%u ", src, dst);
{
const struct dimsg *dimp = (const struct dimsg *)nspp;
u_int reason;
u_int optlen;

if (nsplen < sizeof(struct dimsg))
goto invalid;
reason = GET_LE_U_2(dimp->di_reason);
optlen = GET_U_1(dimp->di_optlen);

print_reason(ndo, reason);
if (optlen) {
ND_PRINT("optlen %u ", optlen);
}
}
break;
case MFS_DC:
ND_PRINT("disconn-confirm %u>%u ", src, dst);
{
const struct dcmsg *dcmp = (const struct dcmsg *)nspp;
u_int reason;

reason = GET_LE_U_2(dcmp->dc_reason);

print_reason(ndo, reason);
}
break;
default:
ND_PRINT("reserved-ctltype? %x %u > %u", flags, src, dst);
break;
}
break;
default:
ND_PRINT("reserved-type? %x %u > %u", flags, src, dst);
break;
}
return (1);

invalid:
return (0);
}

static const struct tok reason2str[] = {
{ UC_OBJREJECT, "object rejected connect" },
{ UC_RESOURCES, "insufficient resources" },
{ UC_NOSUCHNODE, "unrecognized node name" },
{ DI_SHUT, "node is shutting down" },
{ UC_NOSUCHOBJ, "unrecognized object" },
{ UC_INVOBJFORMAT, "invalid object name format" },
{ UC_OBJTOOBUSY, "object too busy" },
{ DI_PROTOCOL, "protocol error discovered" },
{ DI_TPA, "third party abort" },
{ UC_USERABORT, "user abort" },
{ UC_INVNODEFORMAT, "invalid node name format" },
{ UC_LOCALSHUT, "local node shutting down" },
{ DI_LOCALRESRC, "insufficient local resources" },
{ DI_REMUSERRESRC, "insufficient remote user resources" },
{ UC_ACCESSREJECT, "invalid access control information" },
{ DI_BADACCNT, "bad ACCOUNT information" },
{ UC_NORESPONSE, "no response from object" },
{ UC_UNREACHABLE, "node unreachable" },
{ DC_NOLINK, "no link terminate" },
{ DC_COMPLETE, "disconnect complete" },
{ DI_BADIMAGE, "bad image data in connect" },
{ DI_SERVMISMATCH, "cryptographic service mismatch" },
{ 0, NULL }
};

static void
print_reason(netdissect_options *ndo,
u_int reason)
{
ND_PRINT("%s ", tok2str(reason2str, "reason-%u", reason));
}

const char *
dnnum_string(netdissect_options *ndo, u_short dnaddr)
{
char *str;
size_t siz;
u_int area = (u_short)(dnaddr & AREAMASK) >> AREASHIFT;
u_int node = dnaddr & NODEMASK;

/* malloc() return used by the 'dnaddrtable' hash table: do not free() */
str = (char *)malloc(siz = sizeof("00.0000"));
if (str == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC, "%s: malloc", __func__);
snprintf(str, siz, "%u.%u", area, node);
return(str);
}