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addrtoname.c

/*
 * Copyright (c) 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.
 *
 *  Internet, ethernet, port, and protocol string to address
 *  and address to string conversion routines
 */
#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/addrtoname.c,v 1.96.2.6 2004/03/24 04:14:31 guy Exp $ (LBL)";
#endif

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

#include <tcpdump-stdinc.h>

#ifdef USE_ETHER_NTOHOST
#ifdef HAVE_NETINET_IF_ETHER_H
struct mbuf;            /* Squelch compiler warnings on some platforms for */
struct rtentry;         /* declarations in <net/if.h> */
#include <net/if.h>     /* for "struct ifnet" in "struct arpcom" on Solaris */
#include <netinet/if_ether.h>
#endif /* HAVE_NETINET_IF_ETHER_H */
#ifdef HAVE_NETINET_ETHER_H
#include <netinet/ether.h>  /* ether_ntohost on linux */
#endif /* HAVE_NETINET_ETHER_H */
#endif /* USE_ETHER_NTOHOST */

#include <pcap.h>
#include <pcap-namedb.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "interface.h"
#include "addrtoname.h"
#include "llc.h"
#include "setsignal.h"

/*
 * hash tables for whatever-to-name translations
 *
 * XXX there has to be error checks against strdup(3) failure
 */

#define HASHNAMESIZE 4096

struct hnamemem {
      u_int32_t addr;
      const char *name;
      struct hnamemem *nxt;
};

struct hnamemem hnametable[HASHNAMESIZE];
struct hnamemem tporttable[HASHNAMESIZE];
struct hnamemem uporttable[HASHNAMESIZE];
struct hnamemem eprototable[HASHNAMESIZE];
struct hnamemem dnaddrtable[HASHNAMESIZE];
struct hnamemem llcsaptable[HASHNAMESIZE];
struct hnamemem ipxsaptable[HASHNAMESIZE];

#if defined(INET6) && defined(WIN32)
/*
 * fake gethostbyaddr for Win2k/XP
 * gethostbyaddr() returns incorrect value when AF_INET6 is passed
 * to 3rd argument.
 *
 * h_name in struct hostent is only valid.
 */
static struct hostent *
win32_gethostbyaddr(const char *addr, int len, int type)
{
      static struct hostent host;
      static char hostbuf[NI_MAXHOST];
      char hname[NI_MAXHOST];
      struct sockaddr_in6 addr6;

      host.h_name = hostbuf;
      switch (type) {
      case AF_INET:
            return gethostbyaddr(addr, len, type);
            break;
      case AF_INET6:
            memset(&addr6, 0, sizeof(addr6));
            addr6.sin6_family = AF_INET6;
            memcpy(&addr6.sin6_addr, addr, len);
#ifdef __MINGW32__
            /* MinGW doesn't provide getnameinfo */
            return NULL;
#else
            if (getnameinfo((struct sockaddr *)&addr6, sizeof(addr6),
                  hname, sizeof(hname), NULL, 0, 0)) {
                return NULL;
            } else {
                  strcpy(host.h_name, hname);
                  return &host;
            }
#endif /* __MINGW32__ */
            break;
      default:
            return NULL;
      }
}
#define gethostbyaddr win32_gethostbyaddr
#endif /* INET6 & WIN32*/

#ifdef INET6
struct h6namemem {
      struct in6_addr addr;
      char *name;
      struct h6namemem *nxt;
};

struct h6namemem h6nametable[HASHNAMESIZE];
#endif /* INET6 */

struct enamemem {
      u_short e_addr0;
      u_short e_addr1;
      u_short e_addr2;
      const char *e_name;
      u_char *e_nsap;               /* used only for nsaptable[] */
#define e_bs e_nsap                 /* for bytestringtable */
      struct enamemem *e_nxt;
};

struct enamemem enametable[HASHNAMESIZE];
struct enamemem nsaptable[HASHNAMESIZE];
struct enamemem bytestringtable[HASHNAMESIZE];

struct protoidmem {
      u_int32_t p_oui;
      u_short p_proto;
      const char *p_name;
      struct protoidmem *p_nxt;
};

struct protoidmem protoidtable[HASHNAMESIZE];

/*
 * A faster replacement for inet_ntoa().
 */
const char *
intoa(u_int32_t addr)
{
      register char *cp;
      register u_int byte;
      register int n;
      static char buf[sizeof(".xxx.xxx.xxx.xxx")];

      NTOHL(addr);
      cp = &buf[sizeof buf];
      *--cp = '\0';

      n = 4;
      do {
            byte = addr & 0xff;
            *--cp = byte % 10 + '0';
            byte /= 10;
            if (byte > 0) {
                  *--cp = byte % 10 + '0';
                  byte /= 10;
                  if (byte > 0)
                        *--cp = byte + '0';
            }
            *--cp = '.';
            addr >>= 8;
      } while (--n > 0);

      return cp + 1;
}

static u_int32_t f_netmask;
static u_int32_t f_localnet;

/*
 * Return a name for the IP address pointed to by ap.  This address
 * is assumed to be in network byte order.
 *
 * NOTE: ap is *NOT* necessarily part of the packet data (not even if
 * this is being called with the "ipaddr_string()" macro), so you
 * *CANNOT* use the TCHECK{2}/TTEST{2} macros on it.  Furthermore,
 * even in cases where it *is* part of the packet data, the caller
 * would still have to check for a null return value, even if it's
 * just printing the return value with "%s" - not all versions of
 * printf print "(null)" with "%s" and a null pointer, some of them
 * don't check for a null pointer and crash in that case.
 *
 * The callers of this routine should, before handing this routine
 * a pointer to packet data, be sure that the data is present in
 * the packet buffer.  They should probably do those checks anyway,
 * as other data at that layer might not be IP addresses, and it
 * also needs to check whether they're present in the packet buffer.
 */
const char *
getname(const u_char *ap)
{
      register struct hostent *hp;
      u_int32_t addr;
      static struct hnamemem *p;          /* static for longjmp() */

      memcpy(&addr, ap, sizeof(addr));
      p = &hnametable[addr & (HASHNAMESIZE-1)];
      for (; p->nxt; p = p->nxt) {
            if (p->addr == addr)
                  return (p->name);
      }
      p->addr = addr;
      p->nxt = newhnamemem();

      /*
       * Print names unless:
       *    (1) -n was given.
       *      (2) Address is foreign and -f was given. (If -f was not
       *        given, f_netmask and f_localnet are 0 and the test
       *        evaluates to true)
       */
      if (!nflag &&
          (addr & f_netmask) == f_localnet) {
            hp = gethostbyaddr((char *)&addr, 4, AF_INET);
            if (hp) {
                  char *dotp;

                  p->name = strdup(hp->h_name);
                  if (Nflag) {
                        /* Remove domain qualifications */
                        dotp = strchr(p->name, '.');
                        if (dotp)
                              *dotp = '\0';
                  }
                  return (p->name);
            }
      }
      p->name = strdup(intoa(addr));
      return (p->name);
}

#ifdef INET6
/*
 * Return a name for the IP6 address pointed to by ap.  This address
 * is assumed to be in network byte order.
 */
const char *
getname6(const u_char *ap)
{
      register struct hostent *hp;
      struct in6_addr addr;
      static struct h6namemem *p;         /* static for longjmp() */
      register const char *cp;
      char ntop_buf[INET6_ADDRSTRLEN];

      memcpy(&addr, ap, sizeof(addr));
      p = &h6nametable[*(u_int16_t *)&addr.s6_addr[14] & (HASHNAMESIZE-1)];
      for (; p->nxt; p = p->nxt) {
            if (memcmp(&p->addr, &addr, sizeof(addr)) == 0)
                  return (p->name);
      }
      p->addr = addr;
      p->nxt = newh6namemem();

      /*
       * Do not print names if -n was given.
       */
      if (!nflag) {
            hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET6);
            if (hp) {
                  char *dotp;

                  p->name = strdup(hp->h_name);
                  if (Nflag) {
                        /* Remove domain qualifications */
                        dotp = strchr(p->name, '.');
                        if (dotp)
                              *dotp = '\0';
                  }
                  return (p->name);
            }
      }
      cp = inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf));
      p->name = strdup(cp);
      return (p->name);
}
#endif /* INET6 */

static char hex[] = "0123456789abcdef";


/* Find the hash node that corresponds the ether address 'ep' */

static inline struct enamemem *
lookup_emem(const u_char *ep)
{
      register u_int i, j, k;
      struct enamemem *tp;

      k = (ep[0] << 8) | ep[1];
      j = (ep[2] << 8) | ep[3];
      i = (ep[4] << 8) | ep[5];

      tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)];
      while (tp->e_nxt)
            if (tp->e_addr0 == i &&
                tp->e_addr1 == j &&
                tp->e_addr2 == k)
                  return tp;
            else
                  tp = tp->e_nxt;
      tp->e_addr0 = i;
      tp->e_addr1 = j;
      tp->e_addr2 = k;
      tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
      if (tp->e_nxt == NULL)
            error("lookup_emem: calloc");

      return tp;
}

/*
 * Find the hash node that corresponds to the bytestring 'bs'
 * with length 'nlen'
 */

static inline struct enamemem *
lookup_bytestring(register const u_char *bs, const unsigned int nlen)
{
      struct enamemem *tp;
      register u_int i, j, k;

      if (nlen >= 6) {
            k = (bs[0] << 8) | bs[1];
            j = (bs[2] << 8) | bs[3];
            i = (bs[4] << 8) | bs[5];
      } else if (nlen >= 4) {
            k = (bs[0] << 8) | bs[1];
            j = (bs[2] << 8) | bs[3];
            i = 0;
      } else
            i = j = k = 0;

      tp = &bytestringtable[(i ^ j) & (HASHNAMESIZE-1)];
      while (tp->e_nxt)
            if (tp->e_addr0 == i &&
                tp->e_addr1 == j &&
                tp->e_addr2 == k &&
                memcmp((const char *)bs, (const char *)(tp->e_bs), nlen) == 0)
                  return tp;
            else
                  tp = tp->e_nxt;

      tp->e_addr0 = i;
      tp->e_addr1 = j;
      tp->e_addr2 = k;

      tp->e_bs = (u_char *) calloc(1, nlen + 1);
      memcpy(tp->e_bs, bs, nlen);
      tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
      if (tp->e_nxt == NULL)
            error("lookup_bytestring: calloc");

      return tp;
}

/* Find the hash node that corresponds the NSAP 'nsap' */

static inline struct enamemem *
lookup_nsap(register const u_char *nsap)
{
      register u_int i, j, k;
      unsigned int nlen = *nsap;
      struct enamemem *tp;
      const u_char *ensap = nsap + nlen - 6;

      if (nlen > 6) {
            k = (ensap[0] << 8) | ensap[1];
            j = (ensap[2] << 8) | ensap[3];
            i = (ensap[4] << 8) | ensap[5];
      }
      else
            i = j = k = 0;

      tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)];
      while (tp->e_nxt)
            if (tp->e_addr0 == i &&
                tp->e_addr1 == j &&
                tp->e_addr2 == k &&
                tp->e_nsap[0] == nlen &&
                memcmp((const char *)&(nsap[1]),
                  (char *)&(tp->e_nsap[1]), nlen) == 0)
                  return tp;
            else
                  tp = tp->e_nxt;
      tp->e_addr0 = i;
      tp->e_addr1 = j;
      tp->e_addr2 = k;
      tp->e_nsap = (u_char *)malloc(nlen + 1);
      if (tp->e_nsap == NULL)
            error("lookup_nsap: malloc");
      memcpy((char *)tp->e_nsap, (const char *)nsap, nlen + 1);
      tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
      if (tp->e_nxt == NULL)
            error("lookup_nsap: calloc");

      return tp;
}

/* Find the hash node that corresponds the protoid 'pi'. */

static inline struct protoidmem *
lookup_protoid(const u_char *pi)
{
      register u_int i, j;
      struct protoidmem *tp;

      /* 5 octets won't be aligned */
      i = (((pi[0] << 8) + pi[1]) << 8) + pi[2];
      j =   (pi[3] << 8) + pi[4];
      /* XXX should be endian-insensitive, but do big-endian testing  XXX */

      tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)];
      while (tp->p_nxt)
            if (tp->p_oui == i && tp->p_proto == j)
                  return tp;
            else
                  tp = tp->p_nxt;
      tp->p_oui = i;
      tp->p_proto = j;
      tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp));
      if (tp->p_nxt == NULL)
            error("lookup_protoid: calloc");

      return tp;
}

const char *
etheraddr_string(register const u_char *ep)
{
      register u_int i;
      register char *cp;
      register struct enamemem *tp;
      char buf[sizeof("00:00:00:00:00:00")];

      tp = lookup_emem(ep);
      if (tp->e_name)
            return (tp->e_name);
#ifdef USE_ETHER_NTOHOST
      if (!nflag) {
            char buf2[128];
            if (ether_ntohost(buf2, (const struct ether_addr *)ep) == 0) {
                  tp->e_name = strdup(buf2);
                  return (tp->e_name);
            }
      }
#endif
      cp = buf;
        *cp++ = hex[*ep >> 4 ];
      *cp++ = hex[*ep++ & 0xf];
      for (i = 5; (int)--i >= 0;) {
            *cp++ = ':';
                *cp++ = hex[*ep >> 4 ];
            *cp++ = hex[*ep++ & 0xf];
      }
      *cp = '\0';
      tp->e_name = strdup(buf);
      return (tp->e_name);
}

const char *
linkaddr_string(const u_char *ep, const unsigned int len)
{
      register u_int i, j;
      register char *cp;
      register struct enamemem *tp;

      if (len == 6)     /* XXX not totally correct... */
            return etheraddr_string(ep);

      tp = lookup_bytestring(ep, len);
      if (tp->e_name)
            return (tp->e_name);

      tp->e_name = cp = (char *)malloc(len*3);
      if (tp->e_name == NULL)
            error("linkaddr_string: malloc");
      if ((j = *ep >> 4) != 0)
            *cp++ = hex[j];
      *cp++ = hex[*ep++ & 0xf];
      for (i = len-1; i > 0 ; --i) {
            *cp++ = ':';
            if ((j = *ep >> 4) != 0)
                  *cp++ = hex[j];
            *cp++ = hex[*ep++ & 0xf];
      }
      *cp = '\0';
      return (tp->e_name);
}

const char *
etherproto_string(u_short port)
{
      register char *cp;
      register struct hnamemem *tp;
      register u_int32_t i = port;
      char buf[sizeof("0000")];

      for (tp = &eprototable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
            if (tp->addr == i)
                  return (tp->name);

      tp->addr = i;
      tp->nxt = newhnamemem();

      cp = buf;
      NTOHS(port);
      *cp++ = hex[port >> 12 & 0xf];
      *cp++ = hex[port >> 8 & 0xf];
      *cp++ = hex[port >> 4 & 0xf];
      *cp++ = hex[port & 0xf];
      *cp++ = '\0';
      tp->name = strdup(buf);
      return (tp->name);
}

const char *
protoid_string(register const u_char *pi)
{
      register u_int i, j;
      register char *cp;
      register struct protoidmem *tp;
      char buf[sizeof("00:00:00:00:00")];

      tp = lookup_protoid(pi);
      if (tp->p_name)
            return tp->p_name;

      cp = buf;
      if ((j = *pi >> 4) != 0)
            *cp++ = hex[j];
      *cp++ = hex[*pi++ & 0xf];
      for (i = 4; (int)--i >= 0;) {
            *cp++ = ':';
            if ((j = *pi >> 4) != 0)
                  *cp++ = hex[j];
            *cp++ = hex[*pi++ & 0xf];
      }
      *cp = '\0';
      tp->p_name = strdup(buf);
      return (tp->p_name);
}

const char *
llcsap_string(u_char sap)
{
      register struct hnamemem *tp;
      register u_int32_t i = sap;
      char buf[sizeof("sap 00")];

      for (tp = &llcsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
            if (tp->addr == i)
                  return (tp->name);

      tp->addr = i;
      tp->nxt = newhnamemem();

      snprintf(buf, sizeof(buf), "sap %02x", sap & 0xff);
      tp->name = strdup(buf);
      return (tp->name);
}

const char *
isonsap_string(const u_char *nsap)
{
      register u_int i, nlen = nsap[0];
      register char *cp;
      register struct enamemem *tp;

      tp = lookup_nsap(nsap);
      if (tp->e_name)
            return tp->e_name;

      tp->e_name = cp = (char *)malloc(nlen * 2 + 2);
      if (cp == NULL)
            error("isonsap_string: malloc");

      nsap++;
      *cp++ = '/';
      for (i = nlen; (int)--i >= 0;) {
            *cp++ = hex[*nsap >> 4];
            *cp++ = hex[*nsap++ & 0xf];
      }
      *cp = '\0';
      return (tp->e_name);
}

const char *
tcpport_string(u_short port)
{
      register struct hnamemem *tp;
      register u_int32_t i = port;
      char buf[sizeof("00000")];

      for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
            if (tp->addr == i)
                  return (tp->name);

      tp->addr = i;
      tp->nxt = newhnamemem();

      (void)snprintf(buf, sizeof(buf), "%u", i);
      tp->name = strdup(buf);
      return (tp->name);
}

const char *
udpport_string(register u_short port)
{
      register struct hnamemem *tp;
      register u_int32_t i = port;
      char buf[sizeof("00000")];

      for (tp = &uporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
            if (tp->addr == i)
                  return (tp->name);

      tp->addr = i;
      tp->nxt = newhnamemem();

      (void)snprintf(buf, sizeof(buf), "%u", i);
      tp->name = strdup(buf);
      return (tp->name);
}

const char *
ipxsap_string(u_short port)
{
      register char *cp;
      register struct hnamemem *tp;
      register u_int32_t i = port;
      char buf[sizeof("0000")];

      for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
            if (tp->addr == i)
                  return (tp->name);

      tp->addr = i;
      tp->nxt = newhnamemem();

      cp = buf;
      NTOHS(port);
      *cp++ = hex[port >> 12 & 0xf];
      *cp++ = hex[port >> 8 & 0xf];
      *cp++ = hex[port >> 4 & 0xf];
      *cp++ = hex[port & 0xf];
      *cp++ = '\0';
      tp->name = strdup(buf);
      return (tp->name);
}

static void
init_servarray(void)
{
      struct servent *sv;
      register struct hnamemem *table;
      register int i;
      char buf[sizeof("0000000000")];

      while ((sv = getservent()) != NULL) {
            int port = ntohs(sv->s_port);
            i = port & (HASHNAMESIZE-1);
            if (strcmp(sv->s_proto, "tcp") == 0)
                  table = &tporttable[i];
            else if (strcmp(sv->s_proto, "udp") == 0)
                  table = &uporttable[i];
            else
                  continue;

            while (table->name)
                  table = table->nxt;
            if (nflag) {
                  (void)snprintf(buf, sizeof(buf), "%d", port);
                  table->name = strdup(buf);
            } else
                  table->name = strdup(sv->s_name);
            table->addr = port;
            table->nxt = newhnamemem();
      }
      endservent();
}

/*XXX from libbpfc.a */
#ifndef WIN32
extern struct eproto {
#else
__declspec( dllimport) struct eproto {
#endif
      char *s;
      u_short p;
} eproto_db[];

static void
init_eprotoarray(void)
{
      register int i;
      register struct hnamemem *table;

      for (i = 0; eproto_db[i].s; i++) {
            int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1);
            table = &eprototable[j];
            while (table->name)
                  table = table->nxt;
            table->name = eproto_db[i].s;
            table->addr = htons(eproto_db[i].p);
            table->nxt = newhnamemem();
      }
}

static struct protoidlist {
      const u_char protoid[5];
      const char *name;
} protoidlist[] = {
      {{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" },
      {{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" },
      {{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" },
      {{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" },
      {{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" },
      {{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
};

/*
 * SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet
 * types.
 */
static void
init_protoidarray(void)
{
      register int i;
      register struct protoidmem *tp;
      struct protoidlist *pl;
      u_char protoid[5];

      protoid[0] = 0;
      protoid[1] = 0;
      protoid[2] = 0;
      for (i = 0; eproto_db[i].s; i++) {
            u_short etype = htons(eproto_db[i].p);

            memcpy((char *)&protoid[3], (char *)&etype, 2);
            tp = lookup_protoid(protoid);
            tp->p_name = strdup(eproto_db[i].s);
      }
      /* Hardwire some SNAP proto ID names */
      for (pl = protoidlist; pl->name != NULL; ++pl) {
            tp = lookup_protoid(pl->protoid);
            /* Don't override existing name */
            if (tp->p_name != NULL)
                  continue;

            tp->p_name = pl->name;
      }
}

static struct etherlist {
      const u_char addr[6];
      const char *name;
} etherlist[] = {
      {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
      {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
};

/*
 * Initialize the ethers hash table.  We take two different approaches
 * depending on whether or not the system provides the ethers name
 * service.  If it does, we just wire in a few names at startup,
 * and etheraddr_string() fills in the table on demand.  If it doesn't,
 * then we suck in the entire /etc/ethers file at startup.  The idea
 * is that parsing the local file will be fast, but spinning through
 * all the ethers entries via NIS & next_etherent might be very slow.
 *
 * XXX pcap_next_etherent doesn't belong in the pcap interface, but
 * since the pcap module already does name-to-address translation,
 * it's already does most of the work for the ethernet address-to-name
 * translation, so we just pcap_next_etherent as a convenience.
 */
static void
init_etherarray(void)
{
      register struct etherlist *el;
      register struct enamemem *tp;
#ifdef USE_ETHER_NTOHOST
      char name[256];
#else
      register struct pcap_etherent *ep;
      register FILE *fp;

      /* Suck in entire ethers file */
      fp = fopen(PCAP_ETHERS_FILE, "r");
      if (fp != NULL) {
            while ((ep = pcap_next_etherent(fp)) != NULL) {
                  tp = lookup_emem(ep->addr);
                  tp->e_name = strdup(ep->name);
            }
            (void)fclose(fp);
      }
#endif

      /* Hardwire some ethernet names */
      for (el = etherlist; el->name != NULL; ++el) {
            tp = lookup_emem(el->addr);
            /* Don't override existing name */
            if (tp->e_name != NULL)
                  continue;

#ifdef USE_ETHER_NTOHOST
                /* Use yp/nis version of name if available */
                if (ether_ntohost(name, (const struct ether_addr *)el->addr) == 0) {
                        tp->e_name = strdup(name);
                  continue;
            }
#endif
            tp->e_name = el->name;
      }
}

static struct tok llcsap_db[] = {
      { LLCSAP_NULL,          "null" },
      { LLCSAP_8021B_I, "802.1b-gsap" },
      { LLCSAP_8021B_G, "802.1b-isap" },
      { LLCSAP_IP,            "ip-sap" },
      { LLCSAP_PROWAYNM,      "proway-nm" },
      { LLCSAP_8021D,         "802.1d" },
      { LLCSAP_RS511,         "eia-rs511" },
      { LLCSAP_ISO8208, "x.25/llc2" },
      { LLCSAP_PROWAY,  "proway" },
      { LLCSAP_SNAP,          "snap" },
      { LLCSAP_IPX,           "IPX" },
      { LLCSAP_NETBEUI, "netbeui" },
      { LLCSAP_ISONS,         "iso-clns" },
      { LLCSAP_GLOBAL,  "global" },
      { 0,              NULL }
};

static void
init_llcsaparray(void)
{
      register int i;
      register struct hnamemem *table;

      for (i = 0; llcsap_db[i].s != NULL; i++) {
            table = &llcsaptable[llcsap_db[i].v];
            while (table->name)
                  table = table->nxt;
            table->name = llcsap_db[i].s;
            table->addr = llcsap_db[i].v;
            table->nxt = newhnamemem();
      }
}

static struct tok ipxsap_db[] = {
      { 0x0000, "Unknown" },
      { 0x0001, "User" },
      { 0x0002, "User Group" },
      { 0x0003, "PrintQueue" },
      { 0x0004, "FileServer" },
      { 0x0005, "JobServer" },
      { 0x0006, "Gateway" },
      { 0x0007, "PrintServer" },
      { 0x0008, "ArchiveQueue" },
      { 0x0009, "ArchiveServer" },
      { 0x000a, "JobQueue" },
      { 0x000b, "Administration" },
      { 0x000F, "Novell TI-RPC" },
      { 0x0017, "Diagnostics" },
      { 0x0020, "NetBIOS" },
      { 0x0021, "NAS SNA Gateway" },
      { 0x0023, "NACS AsyncGateway" },
      { 0x0024, "RemoteBridge/RoutingService" },
      { 0x0026, "BridgeServer" },
      { 0x0027, "TCP/IP Gateway" },
      { 0x0028, "Point-to-point X.25 BridgeServer" },
      { 0x0029, "3270 Gateway" },
      { 0x002a, "CHI Corp" },
      { 0x002c, "PC Chalkboard" },
      { 0x002d, "TimeSynchServer" },
      { 0x002e, "ARCserve5.0/PalindromeBackup" },
      { 0x0045, "DI3270 Gateway" },
      { 0x0047, "AdvertisingPrintServer" },
      { 0x004a, "NetBlazerModems" },
      { 0x004b, "BtrieveVAP" },
      { 0x004c, "NetwareSQL" },
      { 0x004d, "XtreeNetwork" },
      { 0x0050, "BtrieveVAP4.11" },
      { 0x0052, "QuickLink" },
      { 0x0053, "PrintQueueUser" },
      { 0x0058, "Multipoint X.25 Router" },
      { 0x0060, "STLB/NLM" },
      { 0x0064, "ARCserve" },
      { 0x0066, "ARCserve3.0" },
      { 0x0072, "WAN CopyUtility" },
      { 0x007a, "TES-NetwareVMS" },
      { 0x0092, "WATCOM Debugger/EmeraldTapeBackupServer" },
      { 0x0095, "DDA OBGYN" },
      { 0x0098, "NetwareAccessServer" },
      { 0x009a, "Netware for VMS II/NamedPipeServer" },
      { 0x009b, "NetwareAccessServer" },
      { 0x009e, "PortableNetwareServer/SunLinkNVT" },
      { 0x00a1, "PowerchuteAPC UPS" },
      { 0x00aa, "LAWserve" },
      { 0x00ac, "CompaqIDA StatusMonitor" },
      { 0x0100, "PIPE STAIL" },
      { 0x0102, "LAN ProtectBindery" },
      { 0x0103, "OracleDataBaseServer" },
      { 0x0107, "Netware386/RSPX RemoteConsole" },
      { 0x010f, "NovellSNA Gateway" },
      { 0x0111, "TestServer" },
      { 0x0112, "HP PrintServer" },
      { 0x0114, "CSA MUX" },
      { 0x0115, "CSA LCA" },
      { 0x0116, "CSA CM" },
      { 0x0117, "CSA SMA" },
      { 0x0118, "CSA DBA" },
      { 0x0119, "CSA NMA" },
      { 0x011a, "CSA SSA" },
      { 0x011b, "CSA STATUS" },
      { 0x011e, "CSA APPC" },
      { 0x0126, "SNA TEST SSA Profile" },
      { 0x012a, "CSA TRACE" },
      { 0x012b, "NetwareSAA" },
      { 0x012e, "IKARUS VirusScan" },
      { 0x0130, "CommunicationsExecutive" },
      { 0x0133, "NNS DomainServer/NetwareNamingServicesDomain" },
      { 0x0135, "NetwareNamingServicesProfile" },
      { 0x0137, "Netware386 PrintQueue/NNS PrintQueue" },
      { 0x0141, "LAN SpoolServer" },
      { 0x0152, "IRMALAN Gateway" },
      { 0x0154, "NamedPipeServer" },
      { 0x0166, "NetWareManagement" },
      { 0x0168, "Intel PICKIT CommServer/Intel CAS TalkServer" },
      { 0x0173, "Compaq" },
      { 0x0174, "Compaq SNMP Agent" },
      { 0x0175, "Compaq" },
      { 0x0180, "XTreeServer/XTreeTools" },
      { 0x018A, "NASI ServicesBroadcastServer" },
      { 0x01b0, "GARP Gateway" },
      { 0x01b1, "Binfview" },
      { 0x01bf, "IntelLanDeskManager" },
      { 0x01ca, "AXTEC" },
      { 0x01cb, "ShivaNetModem/E" },
      { 0x01cc, "ShivaLanRover/E" },
      { 0x01cd, "ShivaLanRover/T" },
      { 0x01ce, "ShivaUniversal" },
      { 0x01d8, "CastelleFAXPressServer" },
      { 0x01da, "CastelleLANPressPrintServer" },
      { 0x01dc, "CastelleFAX/Xerox7033 FaxServer/ExcelLanFax" },
      { 0x01f0, "LEGATO" },
      { 0x01f5, "LEGATO" },
      { 0x0233, "NMS Agent/NetwareManagementAgent" },
      { 0x0237, "NMS IPX Discovery/LANternReadWriteChannel" },
      { 0x0238, "NMS IP Discovery/LANternTrapAlarmChannel" },
      { 0x023a, "LANtern" },
      { 0x023c, "MAVERICK" },
      { 0x023f, "NovellSMDR" },
      { 0x024e, "NetwareConnect" },
      { 0x024f, "NASI ServerBroadcast Cisco" },
      { 0x026a, "NMS ServiceConsole" },
      { 0x026b, "TimeSynchronizationServer Netware 4.x" },
      { 0x0278, "DirectoryServer Netware 4.x" },
      { 0x027b, "NetwareManagementAgent" },
      { 0x0280, "Novell File and Printer Sharing Service for PC" },
      { 0x0304, "NovellSAA Gateway" },
      { 0x0308, "COM/VERMED" },
      { 0x030a, "GalacticommWorldgroupServer" },
      { 0x030c, "IntelNetport2/HP JetDirect/HP Quicksilver" },
      { 0x0320, "AttachmateGateway" },
      { 0x0327, "MicrosoftDiagnostiocs" },
      { 0x0328, "WATCOM SQL Server" },
      { 0x0335, "MultiTechSystems MultisynchCommServer" },
      { 0x0343, "Xylogics RemoteAccessServer/LANModem" },
      { 0x0355, "ArcadaBackupExec" },
      { 0x0358, "MSLCD1" },
      { 0x0361, "NETINELO" },
      { 0x037e, "Powerchute UPS Monitoring" },
      { 0x037f, "ViruSafeNotify" },
      { 0x0386, "HP Bridge" },
      { 0x0387, "HP Hub" },
      { 0x0394, "NetWare SAA Gateway" },
      { 0x039b, "LotusNotes" },
      { 0x03b7, "CertusAntiVirus" },
      { 0x03c4, "ARCserve4.0" },
      { 0x03c7, "LANspool3.5" },
      { 0x03d7, "LexmarkPrinterServer" },
      { 0x03d8, "LexmarkXLE PrinterServer" },
      { 0x03dd, "BanyanENS NetwareClient" },
      { 0x03de, "GuptaSequelBaseServer/NetWareSQL" },
      { 0x03e1, "UnivelUnixware" },
      { 0x03e4, "UnivelUnixware" },
      { 0x03fc, "IntelNetport" },
      { 0x03fd, "PrintServerQueue" },
      { 0x040A, "ipnServer" },
      { 0x040D, "LVERRMAN" },
      { 0x040E, "LVLIC" },
      { 0x0414, "NET Silicon (DPI)/Kyocera" },
      { 0x0429, "SiteLockVirus" },
      { 0x0432, "UFHELPR???" },
      { 0x0433, "Synoptics281xAdvancedSNMPAgent" },
      { 0x0444, "MicrosoftNT SNA Server" },
      { 0x0448, "Oracle" },
      { 0x044c, "ARCserve5.01" },
      { 0x0457, "CanonGP55" },
      { 0x045a, "QMS Printers" },
      { 0x045b, "DellSCSI Array" },
      { 0x0491, "NetBlazerModems" },
      { 0x04ac, "OnTimeScheduler" },
      { 0x04b0, "CD-Net" },
      { 0x0513, "EmulexNQA" },
      { 0x0520, "SiteLockChecks" },
      { 0x0529, "SiteLockChecks" },
      { 0x052d, "CitrixOS2 AppServer" },
      { 0x0535, "Tektronix" },
      { 0x0536, "Milan" },
      { 0x055d, "Attachmate SNA gateway" },
      { 0x056b, "IBM8235 ModemServer" },
      { 0x056c, "ShivaLanRover/E PLUS" },
      { 0x056d, "ShivaLanRover/T PLUS" },
      { 0x0580, "McAfeeNetShield" },
      { 0x05B8, "NLM to workstation communication (Revelation Software)" },
      { 0x05BA, "CompatibleSystemsRouters" },
      { 0x05BE, "CheyenneHierarchicalStorageManager" },
      { 0x0606, "JCWatermarkImaging" },
      { 0x060c, "AXISNetworkPrinter" },
      { 0x0610, "AdaptecSCSIManagement" },
      { 0x0621, "IBM AntiVirus" },
      { 0x0640, "Windows95 RemoteRegistryService" },
      { 0x064e, "MicrosoftIIS" },
      { 0x067b, "Microsoft Win95/98 File and Print Sharing for NetWare" },
      { 0x067c, "Microsoft Win95/98 File and Print Sharing for NetWare" },
      { 0x076C, "Xerox" },
      { 0x079b, "ShivaLanRover/E 115" },
      { 0x079c, "ShivaLanRover/T 115" },
      { 0x07B4, "CubixWorldDesk" },
      { 0x07c2, "Quarterdeck IWare Connect V2.x NLM" },
      { 0x07c1, "Quarterdeck IWare Connect V3.x NLM" },
      { 0x0810, "ELAN License Server Demo" },
      { 0x0824, "ShivaLanRoverAccessSwitch/E" },
      { 0x086a, "ISSC Collector" },
      { 0x087f, "ISSC DAS AgentAIX" },
      { 0x0880, "Intel Netport PRO" },
      { 0x0881, "Intel Netport PRO" },
      { 0x0b29, "SiteLock" },
      { 0x0c29, "SiteLockApplications" },
      { 0x0c2c, "LicensingServer" },
      { 0x2101, "PerformanceTechnologyInstantInternet" },
      { 0x2380, "LAI SiteLock" },
      { 0x238c, "MeetingMaker" },
      { 0x4808, "SiteLockServer/SiteLockMetering" },
      { 0x5555, "SiteLockUser" },
      { 0x6312, "Tapeware" },
      { 0x6f00, "RabbitGateway" },
      { 0x7703, "MODEM" },
      { 0x8002, "NetPortPrinters" },
      { 0x8008, "WordPerfectNetworkVersion" },
      { 0x85BE, "Cisco EIGRP" },
      { 0x8888, "WordPerfectNetworkVersion/QuickNetworkManagement" },
      { 0x9000, "McAfeeNetShield" },
      { 0x9604, "CSA-NT_MON" },
      { 0xb6a8, "OceanIsleReachoutRemoteControl" },
      { 0xf11f, "SiteLockMetering" },
      { 0xf1ff, "SiteLock" },
      { 0xf503, "Microsoft SQL Server" },
      { 0xF905, "IBM TimeAndPlace" },
      { 0xfbfb, "TopCallIII FaxServer" },
      { 0xffff, "AnyService/Wildcard" },
      { 0, (char *)0 }
};

static void
init_ipxsaparray(void)
{
      register int i;
      register struct hnamemem *table;

      for (i = 0; ipxsap_db[i].s != NULL; i++) {
            int j = htons(ipxsap_db[i].v) & (HASHNAMESIZE-1);
            table = &ipxsaptable[j];
            while (table->name)
                  table = table->nxt;
            table->name = ipxsap_db[i].s;
            table->addr = htons(ipxsap_db[i].v);
            table->nxt = newhnamemem();
      }
}

/*
 * Initialize the address to name translation machinery.  We map all
 * non-local IP addresses to numeric addresses if fflag is true (i.e.,
 * to prevent blocking on the nameserver).  localnet is the IP address
 * of the local network.  mask is its subnet mask.
 */
void
init_addrtoname(u_int32_t localnet, u_int32_t mask)
{
      if (fflag) {
            f_localnet = localnet;
            f_netmask = mask;
      }
      if (nflag)
            /*
             * Simplest way to suppress names.
             */
            return;

      init_etherarray();
      init_servarray();
      init_eprotoarray();
      init_llcsaparray();
      init_protoidarray();
      init_ipxsaparray();
}

const char *
dnaddr_string(u_short dnaddr)
{
      register struct hnamemem *tp;

      for (tp = &dnaddrtable[dnaddr & (HASHNAMESIZE-1)]; tp->nxt != 0;
           tp = tp->nxt)
            if (tp->addr == dnaddr)
                  return (tp->name);

      tp->addr = dnaddr;
      tp->nxt = newhnamemem();
      if (nflag)
            tp->name = dnnum_string(dnaddr);
      else
            tp->name = dnname_string(dnaddr);

      return(tp->name);
}

/* Return a zero'ed hnamemem struct and cuts down on calloc() overhead */
struct hnamemem *
newhnamemem(void)
{
      register struct hnamemem *p;
      static struct hnamemem *ptr = NULL;
      static u_int num = 0;

      if (num  <= 0) {
            num = 64;
            ptr = (struct hnamemem *)calloc(num, sizeof (*ptr));
            if (ptr == NULL)
                  error("newhnamemem: calloc");
      }
      --num;
      p = ptr++;
      return (p);
}

#ifdef INET6
/* Return a zero'ed h6namemem struct and cuts down on calloc() overhead */
struct h6namemem *
newh6namemem(void)
{
      register struct h6namemem *p;
      static struct h6namemem *ptr = NULL;
      static u_int num = 0;

      if (num  <= 0) {
            num = 64;
            ptr = (struct h6namemem *)calloc(num, sizeof (*ptr));
            if (ptr == NULL)
                  error("newh6namemem: calloc");
      }
      --num;
      p = ptr++;
      return (p);
}
#endif /* INET6 */

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