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print-atalk.c

/*
 * 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.
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-atalk.c,v 1.78.2.2 2003/11/16 08:51:11 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

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

#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h"                /* must come after interface.h */
#include "appletalk.h"

static struct tok type2str[] = {
      { ddpRTMP,        "rtmp" },
      { ddpRTMPrequest, "rtmpReq" },
      { ddpECHO,        "echo" },
      { ddpIP,          "IP" },
      { ddpARP,         "ARP" },
      { ddpKLAP,        "KLAP" },
      { 0,              NULL }
};

struct aarp {
      u_int16_t   htype, ptype;
      u_int8_t    halen, palen;
      u_int16_t   op;
      u_int8_t    hsaddr[6];
      u_int8_t    psaddr[4];
      u_int8_t    hdaddr[6];
      u_int8_t    pdaddr[4];
};

static char tstr[] = "[|atalk]";

static void atp_print(const struct atATP *, u_int);
static void atp_bitmap_print(u_char);
static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
static const char *print_cstring(const char *, const u_char *);
static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
                                    const u_char *,
                                    u_short, u_char, u_char);
static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
                                     const u_char *);
static const char *ataddr_string(u_short, u_char);
static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
static const char *ddpskt_string(int);

/*
 * Print LLAP packets received on a physical LocalTalk interface.
 */
u_int
ltalk_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
      return (llap_print(p, h->caplen));
}

/*
 * Print AppleTalk LLAP packets.
 */
u_int
llap_print(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;

      /*
       * Our packet is on a 4-byte boundary, as we're either called
       * directly from a top-level link-layer printer (ltalk_if_print)
       * or from the UDP printer.  The LLAP+DDP header is a multiple
       * of 4 bytes in length, so the DDP payload is also on a 4-byte
       * boundary, and we don't need to align it before calling
       * "ddp_print()".
       */
      lp = (const struct LAP *)bp;
      bp += sizeof(*lp);
      length -= sizeof(*lp);
      hdrlen = sizeof(*lp);
      switch (lp->type) {

      case lapShortDDP:
            if (length < ddpSSize) {
                  (void)printf(" [|sddp %d]", length);
                  return (length);
            }
            sdp = (const struct atShortDDP *)bp;
            printf("%s.%s",
                ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
            printf(" > %s.%s:",
                ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
            bp += ddpSSize;
            length -= ddpSSize;
            hdrlen += ddpSSize;
            ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
            break;

      case lapDDP:
            if (length < ddpSize) {
                  (void)printf(" [|ddp %d]", length);
                  return (length);
            }
            dp = (const struct atDDP *)bp;
            snet = EXTRACT_16BITS(&dp->srcNet);
            printf("%s.%s", ataddr_string(snet, dp->srcNode),
                ddpskt_string(dp->srcSkt));
            printf(" > %s.%s:",
                ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
                ddpskt_string(dp->dstSkt));
            bp += ddpSize;
            length -= ddpSize;
            hdrlen += ddpSize;
            ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
            break;

#ifdef notdef
      case lapKLAP:
            klap_print(bp, length);
            break;
#endif

      default:
            printf("%d > %d at-lap#%d %d",
                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(register const u_char *bp, u_int length)
{
      register const struct atDDP *dp;
      u_short snet;

      if (length < ddpSize) {
            (void)printf(" [|ddp %d]", length);
            return;
      }
      dp = (const struct atDDP *)bp;
      snet = EXTRACT_16BITS(&dp->srcNet);
      printf("%s.%s", ataddr_string(snet, dp->srcNode),
             ddpskt_string(dp->srcSkt));
      printf(" > %s.%s:",
             ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
             ddpskt_string(dp->dstSkt));
      bp += ddpSize;
      length -= ddpSize;
      ddp_print(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(register const u_char *bp, u_int length)
{
      register const struct aarp *ap;

#define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])

      printf("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 */
                  (void)printf("who-has %s tell %s",
                      AT(pdaddr), AT(psaddr));
                  return;

            case 2:                       /* response */
                  (void)printf("reply %s is-at %s",
                      AT(pdaddr), etheraddr_string(ap->hdaddr));
                  return;

            case 3:                       /* probe (oy!) */
                  (void)printf("probe %s tell %s",
                      AT(pdaddr), AT(psaddr));
                  return;
            }
      (void)printf("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(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((const struct atNBP *)bp, length, snet, snode, skt);
            break;

      case ddpATP:
            atp_print((const struct atATP *)bp, length);
            break;

      default:
            (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
            break;
      }
}

static void
atp_print(register const struct atATP *ap, u_int length)
{
      char c;
      u_int32_t data;

      if ((const u_char *)(ap + 1) > snapend) {
            /* Just bail if we don't have the whole chunk. */
            fputs(tstr, stdout);
            return;
      }
      length -= sizeof(*ap);
      switch (ap->control & 0xc0) {

      case atpReqCode:
            (void)printf(" atp-req%s %d",
                       ap->control & atpXO? " " : "*",
                       EXTRACT_16BITS(&ap->transID));

            atp_bitmap_print(ap->bitmap);

            if (length != 0)
                  (void)printf(" [len=%d]", length);

            switch (ap->control & (atpEOM|atpSTS)) {
            case atpEOM:
                  (void)printf(" [EOM]");
                  break;
            case atpSTS:
                  (void)printf(" [STS]");
                  break;
            case atpEOM|atpSTS:
                  (void)printf(" [EOM,STS]");
                  break;
            }
            break;

      case atpRspCode:
            (void)printf(" atp-resp%s%d:%d (%d)",
                       ap->control & atpEOM? "*" : " ",
                       EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
            switch (ap->control & (atpXO|atpSTS)) {
            case atpXO:
                  (void)printf(" [XO]");
                  break;
            case atpSTS:
                  (void)printf(" [STS]");
                  break;
            case atpXO|atpSTS:
                  (void)printf(" [XO,STS]");
                  break;
            }
            break;

      case atpRelCode:
            (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));

            atp_bitmap_print(ap->bitmap);

            /* length should be zero */
            if (length)
                  (void)printf(" [len=%d]", length);

            /* there shouldn't be any control flags */
            if (ap->control & (atpXO|atpEOM|atpSTS)) {
                  c = '[';
                  if (ap->control & atpXO) {
                        (void)printf("%cXO", c);
                        c = ',';
                  }
                  if (ap->control & atpEOM) {
                        (void)printf("%cEOM", c);
                        c = ',';
                  }
                  if (ap->control & atpSTS) {
                        (void)printf("%cSTS", c);
                        c = ',';
                  }
                  (void)printf("]");
            }
            break;

      default:
            (void)printf(" atp-0x%x  %d (%d)", ap->control,
                       EXTRACT_16BITS(&ap->transID), length);
            break;
      }
      data = EXTRACT_32BITS(&ap->userData);
      if (data != 0)
            (void)printf(" 0x%x", data);
}

static void
atp_bitmap_print(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) {
                        (void)printf("%c%d", c, i);
                        c = ',';
                  }
                  bm >>= 1;
            }
            (void)printf(">");
      } else {
            for (i = 0; bm; ++i)
                  bm >>= 1;
            if (i > 1)
                  (void)printf("<0-%d>", i - 1);
            else
                  (void)printf("<0>");
      }
}

static void
nbp_print(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) {
            (void)printf(" truncated-nbp %d", length);
            return;
      }

      length -= nbpHeaderSize;
      if (length < 8) {
            /* must be room for at least one tuple */
            (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
            return;
      }
      /* ep points to end of available data */
      ep = snapend;
      if ((const u_char *)tp > ep) {
            fputs(tstr, stdout);
            return;
      }
      switch (i = np->control & 0xf0) {

      case nbpBrRq:
      case nbpLkUp:
            (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
                       np->id);
            if ((const u_char *)(tp + 1) > ep) {
                  fputs(tstr, stdout);
                  return;
            }
            (void)nbp_name_print(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)
                  (void)printf(" [ntup=%d]", np->control & 0xf);
            if (tp->enumerator)
                  (void)printf(" [enum=%d]", tp->enumerator);
            if (EXTRACT_16BITS(&tp->net) != snet ||
                tp->node != snode || tp->skt != skt)
                  (void)printf(" [addr=%s.%d]",
                      ataddr_string(EXTRACT_16BITS(&tp->net),
                      tp->node), tp->skt);
            break;

      case nbpLkUpReply:
            (void)printf(" 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(tp, ep, snet, snode, skt);
            break;

      default:
            (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
                        length);
            break;
      }
}

/* print a counted string */
static const char *
print_cstring(register const char *cp, register const u_char *ep)
{
      register u_int length;

      if (cp >= (const char *)ep) {
            fputs(tstr, stdout);
            return (0);
      }
      length = *cp++;

      /* Spec says string can be at most 32 bytes long */
      if (length > 32) {
            (void)printf("[len=%u]", length);
            return (0);
      }
      while ((int)--length >= 0) {
            if (cp >= (const char *)ep) {
                  fputs(tstr, stdout);
                  return (0);
            }
            putchar(*cp++);
      }
      return (cp);
}

static const struct atNBPtuple *
nbp_tuple_print(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) {
            fputs(tstr, stdout);
            return 0;
      }
      tpn = nbp_name_print(tp, ep);

      /* if the enumerator isn't 1, print it */
      if (tp->enumerator != 1)
            (void)printf("(%d)", tp->enumerator);

      /* if the socket doesn't match the src socket, print it */
      if (tp->skt != skt)
            (void)printf(" %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)
            (void)printf(" [addr=%s]",
                ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));

      return (tpn);
}

static const struct atNBPtuple *
nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
{
      register const char *cp = (const char *)tp + nbpTupleSize;

      putchar(' ');

      /* Object */
      putchar('"');
      if ((cp = print_cstring(cp, ep)) != NULL) {
            /* Type */
            putchar(':');
            if ((cp = print_cstring(cp, ep)) != NULL) {
                  /* Zone */
                  putchar('@');
                  if ((cp = print_cstring(cp, ep)) != NULL)
                        putchar('"');
            }
      }
      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(u_short atnet, u_char athost)
{
      register struct hnamemem *tp, *tp2;
      register int i = (atnet << 8) | athost;
      char nambuf[MAXHOSTNAMELEN + 20];
      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, !nflag)
          && (fp = fopen("/etc/atalk.names", "r"))) {
            char line[256];
            int i1, i2, i3;

            while (fgets(line, sizeof(line), fp)) {
                  if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
                        continue;
                  if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
                             nambuf) == 4)
                        /* got a hostname. */
                        i3 |= ((i1 << 8) | i2) << 8;
                  else if (sscanf(line, "%d.%d %256s", &i1, &i2,
                              nambuf) == 3)
                        /* got a net name */
                        i3 = (((i1 << 8) | i2) << 8) | 255;
                  else
                        continue;

                  for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
                       tp->nxt; tp = tp->nxt)
                        ;
                  tp->addr = i3;
                  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.%d",
                atnet >> 8, atnet & 0xff, athost);
      else
            (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
                atnet & 0xff);
      tp->name = strdup(nambuf);

      return (tp->name);
}

static 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(register int skt)
{
      static char buf[8];

      if (nflag) {
            (void)snprintf(buf, sizeof(buf), "%d", skt);
            return (buf);
      }
      return (tok2str(skt2str, "%d", skt));
}

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