text: /*	$OpenBSD: print-atalk.c,v 1.33 2017/08/30 09:23:00 otto Exp $	*/
  
  /*
   * 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.
   */
  
  #include <sys/time.h>
  #include <sys/socket.h>
  
  struct mbuf;
  struct rtentry;
  #include <net/if.h>
  
  #include <netinet/in.h>
  #include <netinet/ip.h>
  #include <netinet/ip_var.h>
  #include <netinet/if_ether.h>
  #include <netinet/udp.h>
  #include <netinet/udp_var.h>
  #include <netinet/tcp.h>
  
  #include <inttypes.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <limits.h>
  
  #include "interface.h"
  #include "addrtoname.h"
  #include "ethertype.h"
  #include "extract.h"			/* must come after interface.h */
  #include "appletalk.h"
  #include "savestr.h"
  #include "privsep.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 AppleTalk Datagram Delivery Protocol packets
   * without the LLAP encapsulating header (i.e.
   * from Ethertalk)
   */
  void
  atalk_print(const u_char *bp, u_int length)
  {
  	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);
  }
  
  /*
   * Print AppleTalk Datagram Delivery Protocol packets
   * from localtalk (i.e. the 230 Kbps net built into
   * every Macintosh). We can get these from a localtalk
   * interface if we have one, or from UDP encapsulated tunnels.
   */
  void
  atalk_print_llap(const u_char *bp, u_int length)
  {
  	const struct LAP *lp;
  	const struct atDDP *dp;
  	const struct atShortDDP *sdp;
  	u_short snet;
  
  	if (length < sizeof(*lp)) {
  		(void)printf(" [|llap %d]", length);
  		return;
  	}
  
  	lp = (struct LAP *)bp;
  	bp += sizeof(*lp);
  	length -= sizeof(*lp);
  	switch (lp->type) {
  
  	case lapShortDDP:
  		if (length < ddpSSize) {
  			(void)printf(" [|sddp %d]", length);
  			return;
  		}
  		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;
  		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
  		break;
  
  	case lapDDP:
  		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);
  		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;
  	}
  }
  
  /* XXX should probably pass in the snap header and do checks like arp_print() */
  void
  aarp_print(const u_char *bp, u_int length)
  {
  	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 (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
  	    ap->halen == 6 && ap->palen == 4 )
  		switch (ntohs(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, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
  	    ap->halen, ap->palen);
  }
  
  static void
  ddp_print(const u_char *bp, u_int length, int t,
  	  u_short snet, u_char snode, u_char skt)
  {
  
  	if ((intptr_t)bp & (sizeof(long)-1)) {
  		static u_char *abuf = NULL;
  		int clen = snapend - bp;
  		if (clen > snaplen)
  			clen = snaplen;
  
  		if (abuf == NULL) {
  			abuf = malloc(snaplen);
  			if (abuf == NULL)
  				error("ddp_print: malloc");
  		}
  		memmove((char *)abuf, (char *)bp, min(length, clen));
  		snapend = abuf + clen;
  		packetp = abuf;
  		bp = abuf;
  	}
  
  	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(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(u_char bm)
  {
  	char c;
  	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(const struct atNBP *np, u_int length, u_short snet,
  	  u_char snode, u_char skt)
  {
  	const struct atNBPtuple *tp =
  			(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 */
  		if (np->control == nbpNATLKerr) {
  			(void)printf(" nbp-netatalk_err");
  			return;
  		} else if (np->control == nbpNATLKok) {
  			(void)printf(" nbp-netatalk_ok");
  			return;
  		}
  		(void)printf(" truncated-nbp nbp-0x%x  %d (%d)",
  			np->control, np->id, 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;
  
  	case nbpNATLKrgstr:
  	case nbpNATLKunrgstr:
  		(void)printf((i == nbpNATLKrgstr) ?
  			" nbp-netatalk_rgstr %d:" :
  			" nbp-netatalk_unrgstr %d:",
  			np->id);
  		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(const char *cp, const u_char *ep)
  {
  	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=%d]", length);
  		return (0);
  	}
  	while ((int)--length >= 0) {
  		if (cp >= (char *)ep) {
  			fputs(tstr, stdout);
  			return (0);
  		}
  		putchar(*cp++);
  	}
  	return (cp);
  }
  
  static const struct atNBPtuple *
  nbp_tuple_print(const struct atNBPtuple *tp,
  		const u_char *ep,
  		u_short snet, u_char snode,
  		u_char skt)
  {
  	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, const u_char *ep)
  {
  	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)
  {
  	struct hnamemem *tp, *tp2;
  	int i = (atnet << 8) | athost;
  	char nambuf[HOST_NAME_MAX+1 + 20];
  
  	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 = savestr(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 = savestr(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(int skt)
  {
  	static char buf[12];
  
  	if (nflag) {
  		(void)snprintf(buf, sizeof buf, "%d", skt);
  		return (buf);
  	}
  	return (tok2str(skt2str, "%d", skt));
  }
  