nexmon – Rev 1
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/*
* Copyright (c) 1988, 1989, 1990, 1991, 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.
*
* Format and print AppleTalk packets.
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h" /* must come after interface.h */
#include "appletalk.h"
static const char tstr[] = "[|atalk]";
static const struct tok type2str[] = {
{ ddpRTMP, "rtmp" },
{ ddpRTMPrequest, "rtmpReq" },
{ ddpECHO, "echo" },
{ ddpIP, "IP" },
{ ddpARP, "ARP" },
{ ddpKLAP, "KLAP" },
{ 0, NULL }
};
struct aarp {
uint16_t htype, ptype;
uint8_t halen, palen;
uint16_t op;
uint8_t hsaddr[6];
uint8_t psaddr[4];
uint8_t hdaddr[6];
uint8_t pdaddr[4];
};
static void atp_print(netdissect_options *, const struct atATP *, u_int);
static void atp_bitmap_print(netdissect_options *, u_char);
static void nbp_print(netdissect_options *, const struct atNBP *, u_int, u_short, u_char, u_char);
static const struct atNBPtuple *nbp_tuple_print(netdissect_options *ndo, const struct atNBPtuple *,
const u_char *,
u_short, u_char, u_char);
static const struct atNBPtuple *nbp_name_print(netdissect_options *, const struct atNBPtuple *,
const u_char *);
static const char *ataddr_string(netdissect_options *, u_short, u_char);
static void ddp_print(netdissect_options *, const u_char *, u_int, int, u_short, u_char, u_char);
static const char *ddpskt_string(netdissect_options *, int);
/*
* Print LLAP packets received on a physical LocalTalk interface.
*/
u_int
ltalk_if_print(netdissect_options *ndo,
const struct pcap_pkthdr *h, const u_char *p)
{
return (llap_print(ndo, p, h->caplen));
}
/*
* Print AppleTalk LLAP packets.
*/
u_int
llap_print(netdissect_options *ndo,
register const u_char *bp, u_int length)
{
register const struct LAP *lp;
register const struct atDDP *dp;
register const struct atShortDDP *sdp;
u_short snet;
u_int hdrlen;
if (length < sizeof(*lp)) {
ND_PRINT((ndo, " [|llap %u]", length));
return (length);
}
lp = (const struct LAP *)bp;
bp += sizeof(*lp);
length -= sizeof(*lp);
hdrlen = sizeof(*lp);
switch (lp->type) {
case lapShortDDP:
if (length < ddpSSize) {
ND_PRINT((ndo, " [|sddp %u]", length));
return (length);
}
sdp = (const struct atShortDDP *)bp;
ND_PRINT((ndo, "%s.%s",
ataddr_string(ndo, 0, lp->src), ddpskt_string(ndo, sdp->srcSkt)));
ND_PRINT((ndo, " > %s.%s:",
ataddr_string(ndo, 0, lp->dst), ddpskt_string(ndo, sdp->dstSkt)));
bp += ddpSSize;
length -= ddpSSize;
hdrlen += ddpSSize;
ddp_print(ndo, bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
break;
case lapDDP:
if (length < ddpSize) {
ND_PRINT((ndo, " [|ddp %u]", length));
return (length);
}
dp = (const struct atDDP *)bp;
snet = EXTRACT_16BITS(&dp->srcNet);
ND_PRINT((ndo, "%s.%s", ataddr_string(ndo, snet, dp->srcNode),
ddpskt_string(ndo, dp->srcSkt)));
ND_PRINT((ndo, " > %s.%s:",
ataddr_string(ndo, EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
ddpskt_string(ndo, dp->dstSkt)));
bp += ddpSize;
length -= ddpSize;
hdrlen += ddpSize;
ddp_print(ndo, bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
break;
#ifdef notdef
case lapKLAP:
klap_print(bp, length);
break;
#endif
default:
ND_PRINT((ndo, "%d > %d at-lap#%d %u",
lp->src, lp->dst, lp->type, length));
break;
}
return (hdrlen);
}
/*
* Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
* when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
* packets in them).
*/
void
atalk_print(netdissect_options *ndo,
register const u_char *bp, u_int length)
{
register const struct atDDP *dp;
u_short snet;
if(!ndo->ndo_eflag)
ND_PRINT((ndo, "AT "));
if (length < ddpSize) {
ND_PRINT((ndo, " [|ddp %u]", length));
return;
}
dp = (const struct atDDP *)bp;
snet = EXTRACT_16BITS(&dp->srcNet);
ND_PRINT((ndo, "%s.%s", ataddr_string(ndo, snet, dp->srcNode),
ddpskt_string(ndo, dp->srcSkt)));
ND_PRINT((ndo, " > %s.%s: ",
ataddr_string(ndo, EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
ddpskt_string(ndo, dp->dstSkt)));
bp += ddpSize;
length -= ddpSize;
ddp_print(ndo, bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
}
/* XXX should probably pass in the snap header and do checks like arp_print() */
void
aarp_print(netdissect_options *ndo,
register const u_char *bp, u_int length)
{
register const struct aarp *ap;
#define AT(member) ataddr_string(ndo, (ap->member[1]<<8)|ap->member[2],ap->member[3])
ND_PRINT((ndo, "aarp "));
ap = (const struct aarp *)bp;
if (EXTRACT_16BITS(&ap->htype) == 1 &&
EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
ap->halen == 6 && ap->palen == 4 )
switch (EXTRACT_16BITS(&ap->op)) {
case 1: /* request */
ND_PRINT((ndo, "who-has %s tell %s", AT(pdaddr), AT(psaddr)));
return;
case 2: /* response */
ND_PRINT((ndo, "reply %s is-at %s", AT(psaddr), etheraddr_string(ndo, ap->hsaddr)));
return;
case 3: /* probe (oy!) */
ND_PRINT((ndo, "probe %s tell %s", AT(pdaddr), AT(psaddr)));
return;
}
ND_PRINT((ndo, "len %u op %u htype %u ptype %#x halen %u palen %u",
length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen));
}
/*
* Print AppleTalk Datagram Delivery Protocol packets.
*/
static void
ddp_print(netdissect_options *ndo,
register const u_char *bp, register u_int length, register int t,
register u_short snet, register u_char snode, u_char skt)
{
switch (t) {
case ddpNBP:
nbp_print(ndo, (const struct atNBP *)bp, length, snet, snode, skt);
break;
case ddpATP:
atp_print(ndo, (const struct atATP *)bp, length);
break;
case ddpEIGRP:
eigrp_print(ndo, bp, length);
break;
default:
ND_PRINT((ndo, " at-%s %d", tok2str(type2str, NULL, t), length));
break;
}
}
static void
atp_print(netdissect_options *ndo,
register const struct atATP *ap, u_int length)
{
char c;
uint32_t data;
if ((const u_char *)(ap + 1) > ndo->ndo_snapend) {
/* Just bail if we don't have the whole chunk. */
ND_PRINT((ndo, "%s", tstr));
return;
}
if (length < sizeof(*ap)) {
ND_PRINT((ndo, " [|atp %u]", length));
return;
}
length -= sizeof(*ap);
switch (ap->control & 0xc0) {
case atpReqCode:
ND_PRINT((ndo, " atp-req%s %d",
ap->control & atpXO? " " : "*",
EXTRACT_16BITS(&ap->transID)));
atp_bitmap_print(ndo, ap->bitmap);
if (length != 0)
ND_PRINT((ndo, " [len=%u]", length));
switch (ap->control & (atpEOM|atpSTS)) {
case atpEOM:
ND_PRINT((ndo, " [EOM]"));
break;
case atpSTS:
ND_PRINT((ndo, " [STS]"));
break;
case atpEOM|atpSTS:
ND_PRINT((ndo, " [EOM,STS]"));
break;
}
break;
case atpRspCode:
ND_PRINT((ndo, " atp-resp%s%d:%d (%u)",
ap->control & atpEOM? "*" : " ",
EXTRACT_16BITS(&ap->transID), ap->bitmap, length));
switch (ap->control & (atpXO|atpSTS)) {
case atpXO:
ND_PRINT((ndo, " [XO]"));
break;
case atpSTS:
ND_PRINT((ndo, " [STS]"));
break;
case atpXO|atpSTS:
ND_PRINT((ndo, " [XO,STS]"));
break;
}
break;
case atpRelCode:
ND_PRINT((ndo, " atp-rel %d", EXTRACT_16BITS(&ap->transID)));
atp_bitmap_print(ndo, ap->bitmap);
/* length should be zero */
if (length)
ND_PRINT((ndo, " [len=%u]", length));
/* there shouldn't be any control flags */
if (ap->control & (atpXO|atpEOM|atpSTS)) {
c = '[';
if (ap->control & atpXO) {
ND_PRINT((ndo, "%cXO", c));
c = ',';
}
if (ap->control & atpEOM) {
ND_PRINT((ndo, "%cEOM", c));
c = ',';
}
if (ap->control & atpSTS) {
ND_PRINT((ndo, "%cSTS", c));
c = ',';
}
ND_PRINT((ndo, "]"));
}
break;
default:
ND_PRINT((ndo, " atp-0x%x %d (%u)", ap->control,
EXTRACT_16BITS(&ap->transID), length));
break;
}
data = EXTRACT_32BITS(&ap->userData);
if (data != 0)
ND_PRINT((ndo, " 0x%x", data));
}
static void
atp_bitmap_print(netdissect_options *ndo,
register u_char bm)
{
register char c;
register int i;
/*
* The '& 0xff' below is needed for compilers that want to sign
* extend a u_char, which is the case with the Ultrix compiler.
* (gcc is smart enough to eliminate it, at least on the Sparc).
*/
if ((bm + 1) & (bm & 0xff)) {
c = '<';
for (i = 0; bm; ++i) {
if (bm & 1) {
ND_PRINT((ndo, "%c%d", c, i));
c = ',';
}
bm >>= 1;
}
ND_PRINT((ndo, ">"));
} else {
for (i = 0; bm; ++i)
bm >>= 1;
if (i > 1)
ND_PRINT((ndo, "<0-%d>", i - 1));
else
ND_PRINT((ndo, "<0>"));
}
}
static void
nbp_print(netdissect_options *ndo,
register const struct atNBP *np, u_int length, register u_short snet,
register u_char snode, register u_char skt)
{
register const struct atNBPtuple *tp =
(const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
int i;
const u_char *ep;
if (length < nbpHeaderSize) {
ND_PRINT((ndo, " truncated-nbp %u", length));
return;
}
length -= nbpHeaderSize;
if (length < 8) {
/* must be room for at least one tuple */
ND_PRINT((ndo, " truncated-nbp %u", length + nbpHeaderSize));
return;
}
/* ep points to end of available data */
ep = ndo->ndo_snapend;
if ((const u_char *)tp > ep) {
ND_PRINT((ndo, "%s", tstr));
return;
}
switch (i = np->control & 0xf0) {
case nbpBrRq:
case nbpLkUp:
ND_PRINT((ndo, i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:", np->id));
if ((const u_char *)(tp + 1) > ep) {
ND_PRINT((ndo, "%s", tstr));
return;
}
(void)nbp_name_print(ndo, tp, ep);
/*
* look for anomalies: the spec says there can only
* be one tuple, the address must match the source
* address and the enumerator should be zero.
*/
if ((np->control & 0xf) != 1)
ND_PRINT((ndo, " [ntup=%d]", np->control & 0xf));
if (tp->enumerator)
ND_PRINT((ndo, " [enum=%d]", tp->enumerator));
if (EXTRACT_16BITS(&tp->net) != snet ||
tp->node != snode || tp->skt != skt)
ND_PRINT((ndo, " [addr=%s.%d]",
ataddr_string(ndo, EXTRACT_16BITS(&tp->net),
tp->node), tp->skt));
break;
case nbpLkUpReply:
ND_PRINT((ndo, " nbp-reply %d:", np->id));
/* print each of the tuples in the reply */
for (i = np->control & 0xf; --i >= 0 && tp; )
tp = nbp_tuple_print(ndo, tp, ep, snet, snode, skt);
break;
default:
ND_PRINT((ndo, " nbp-0x%x %d (%u)", np->control, np->id, length));
break;
}
}
/* print a counted string */
static const char *
print_cstring(netdissect_options *ndo,
register const char *cp, register const u_char *ep)
{
register u_int length;
if (cp >= (const char *)ep) {
ND_PRINT((ndo, "%s", tstr));
return (0);
}
length = *cp++;
/* Spec says string can be at most 32 bytes long */
if (length > 32) {
ND_PRINT((ndo, "[len=%u]", length));
return (0);
}
while ((int)--length >= 0) {
if (cp >= (const char *)ep) {
ND_PRINT((ndo, "%s", tstr));
return (0);
}
ND_PRINT((ndo, "%c", *cp++));
}
return (cp);
}
static const struct atNBPtuple *
nbp_tuple_print(netdissect_options *ndo,
register const struct atNBPtuple *tp, register const u_char *ep,
register u_short snet, register u_char snode, register u_char skt)
{
register const struct atNBPtuple *tpn;
if ((const u_char *)(tp + 1) > ep) {
ND_PRINT((ndo, "%s", tstr));
return 0;
}
tpn = nbp_name_print(ndo, tp, ep);
/* if the enumerator isn't 1, print it */
if (tp->enumerator != 1)
ND_PRINT((ndo, "(%d)", tp->enumerator));
/* if the socket doesn't match the src socket, print it */
if (tp->skt != skt)
ND_PRINT((ndo, " %d", tp->skt));
/* if the address doesn't match the src address, it's an anomaly */
if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
ND_PRINT((ndo, " [addr=%s]",
ataddr_string(ndo, EXTRACT_16BITS(&tp->net), tp->node)));
return (tpn);
}
static const struct atNBPtuple *
nbp_name_print(netdissect_options *ndo,
const struct atNBPtuple *tp, register const u_char *ep)
{
register const char *cp = (const char *)tp + nbpTupleSize;
ND_PRINT((ndo, " "));
/* Object */
ND_PRINT((ndo, "\""));
if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
/* Type */
ND_PRINT((ndo, ":"));
if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
/* Zone */
ND_PRINT((ndo, "@"));
if ((cp = print_cstring(ndo, cp, ep)) != NULL)
ND_PRINT((ndo, "\""));
}
}
return ((const struct atNBPtuple *)cp);
}
#define HASHNAMESIZE 4096
struct hnamemem {
int addr;
char *name;
struct hnamemem *nxt;
};
static struct hnamemem hnametable[HASHNAMESIZE];
static const char *
ataddr_string(netdissect_options *ndo,
u_short atnet, u_char athost)
{
register struct hnamemem *tp, *tp2;
register int i = (atnet << 8) | athost;
char nambuf[256+1];
static int first = 1;
FILE *fp;
/*
* if this is the first call, see if there's an AppleTalk
* number to name map file.
*/
if (first && (first = 0, !ndo->ndo_nflag)
&& (fp = fopen("/etc/atalk.names", "r"))) {
char line[256];
int i1, i2;
while (fgets(line, sizeof(line), fp)) {
if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
continue;
if (sscanf(line, "%d.%d %256s", &i1, &i2, nambuf) == 3)
/* got a hostname. */
i2 |= (i1 << 8);
else if (sscanf(line, "%d %256s", &i1, nambuf) == 2)
/* got a net name */
i2 = (i1 << 8) | 255;
else
continue;
for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
tp->nxt; tp = tp->nxt)
;
tp->addr = i2;
tp->nxt = newhnamemem();
tp->name = strdup(nambuf);
}
fclose(fp);
}
for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
if (tp->addr == i)
return (tp->name);
/* didn't have the node name -- see if we've got the net name */
i |= 255;
for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
if (tp2->addr == i) {
tp->addr = (atnet << 8) | athost;
tp->nxt = newhnamemem();
(void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
tp2->name, athost);
tp->name = strdup(nambuf);
return (tp->name);
}
tp->addr = (atnet << 8) | athost;
tp->nxt = newhnamemem();
if (athost != 255)
(void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet, athost);
else
(void)snprintf(nambuf, sizeof(nambuf), "%d", atnet);
tp->name = strdup(nambuf);
return (tp->name);
}
static const struct tok skt2str[] = {
{ rtmpSkt, "rtmp" }, /* routing table maintenance */
{ nbpSkt, "nis" }, /* name info socket */
{ echoSkt, "echo" }, /* AppleTalk echo protocol */
{ zipSkt, "zip" }, /* zone info protocol */
{ 0, NULL }
};
static const char *
ddpskt_string(netdissect_options *ndo,
register int skt)
{
static char buf[8];
if (ndo->ndo_nflag) {
(void)snprintf(buf, sizeof(buf), "%d", skt);
return (buf);
}
return (tok2str(skt2str, "%d", skt));
}