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res_debug.c

/*
 * Copyright (c) 1985
 *    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 the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies, and that
 * the name of Digital Equipment Corporation not be used in advertising or
 * publicity pertaining to distribution of the document or software without
 * specific, written prior permission.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/*
 * Portions Copyright (c) 1995 by International Business Machines, Inc.
 *
 * International Business Machines, Inc. (hereinafter called IBM) grants
 * permission under its copyrights to use, copy, modify, and distribute this
 * Software with or without fee, provided that the above copyright notice and
 * all paragraphs of this notice appear in all copies, and that the name of IBM
 * not be used in connection with the marketing of any product incorporating
 * the Software or modifications thereof, without specific, written prior
 * permission.
 *
 * To the extent it has a right to do so, IBM grants an immunity from suit
 * under its patents, if any, for the use, sale or manufacture of products to
 * the extent that such products are used for performing Domain Name System
 * dynamic updates in TCP/IP networks by means of the Software.  No immunity is
 * granted for any product per se or for any other function of any product.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE.  IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL,
 * DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN
 * IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.
 */

/*
 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)res_debug.c   8.1 (Berkeley) 6/4/93";
static const char rcsid[] = "$BINDId: res_debug.c,v 8.34 2000/02/29 05:30:55 vixie Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>

#include <ctype.h>
#include <errno.h>
#include <math.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) sprintf x
#endif

extern const char *_res_opcodes[];
extern const char *_res_sectioncodes[];

/*
 * Print the current options.
 */
void
fp_resstat(const res_state statp, FILE *file) {
      u_long mask;

      fprintf(file, ";; res options:");
      for (mask = 1;  mask != 0;  mask <<= 1)
            if (statp->options & mask)
                  fprintf(file, " %s", p_option(mask));
      putc('\n', file);
}

static void
do_section(const res_state statp,
         ns_msg *handle, ns_sect section,
         int pflag, FILE *file)
{
      int n, sflag, rrnum;
      static int buflen = 2048;
      char *buf;
      ns_opcode opcode;
      ns_rr rr;

      /*
       * Print answer records.
       */
      sflag = (statp->pfcode & pflag);
      if (statp->pfcode && !sflag)
            return;

      buf = malloc(buflen);
      if (buf == NULL) {
            fprintf(file, ";; memory allocation failure\n");
            return;
      }

      opcode = (ns_opcode) ns_msg_getflag(*handle, ns_f_opcode);
      rrnum = 0;
      for (;;) {
            if (ns_parserr(handle, section, rrnum, &rr)) {
                  if (errno != ENODEV)
                        fprintf(file, ";; ns_parserr: %s\n",
                              strerror(errno));
                  else if (rrnum > 0 && sflag != 0 &&
                         (statp->pfcode & RES_PRF_HEAD1))
                        putc('\n', file);
                  goto cleanup;
            }
            if (rrnum == 0 && sflag != 0 && (statp->pfcode & RES_PRF_HEAD1))
                  fprintf(file, ";; %s SECTION:\n",
                        p_section(section, opcode));
            if (section == ns_s_qd)
                  fprintf(file, ";;\t%s, type = %s, class = %s\n",
                        ns_rr_name(rr),
                        p_type(ns_rr_type(rr)),
                        p_class(ns_rr_class(rr)));
            else {
                  n = ns_sprintrr(handle, &rr, NULL, NULL,
                              buf, buflen);
                  if (n < 0) {
                        if (errno == ENOSPC) {
                              free(buf);
                              buf = NULL;
                              if (buflen < 131072)
                                    buf = malloc(buflen += 1024);
                              if (buf == NULL) {
                                    fprintf(file,
                                      ";; memory allocation failure\n");
                                    return;
                              }
                              continue;
                        }
                        fprintf(file, ";; ns_sprintrr: %s\n",
                              strerror(errno));
                        goto cleanup;
                  }
                  fputs(buf, file);
                  fputc('\n', file);
            }
            rrnum++;
      }
 cleanup:
      if (buf != NULL)
            free(buf);
}

/*
 * Print the contents of a query.
 * This is intended to be primarily a debugging routine.
 */
void
res_pquery(const res_state statp, const u_char *msg, int len, FILE *file) {
      ns_msg handle;
      int qdcount, ancount, nscount, arcount;
      u_int opcode, rcode, id;

      if (ns_initparse(msg, len, &handle) < 0) {
            fprintf(file, ";; ns_initparse: %s\n", strerror(errno));
            return;
      }
      opcode = ns_msg_getflag(handle, ns_f_opcode);
      rcode = ns_msg_getflag(handle, ns_f_rcode);
      id = ns_msg_id(handle);
      qdcount = ns_msg_count(handle, ns_s_qd);
      ancount = ns_msg_count(handle, ns_s_an);
      nscount = ns_msg_count(handle, ns_s_ns);
      arcount = ns_msg_count(handle, ns_s_ar);

      /*
       * Print header fields.
       */
      if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEADX) || rcode)
            fprintf(file,
                  ";; ->>HEADER<<- opcode: %s, status: %s, id: %d\n",
                  _res_opcodes[opcode], p_rcode(rcode), id);
      if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEADX))
            putc(';', file);
      if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEAD2)) {
            fprintf(file, "; flags:");
            if (ns_msg_getflag(handle, ns_f_qr))
                  fprintf(file, " qr");
            if (ns_msg_getflag(handle, ns_f_aa))
                  fprintf(file, " aa");
            if (ns_msg_getflag(handle, ns_f_tc))
                  fprintf(file, " tc");
            if (ns_msg_getflag(handle, ns_f_rd))
                  fprintf(file, " rd");
            if (ns_msg_getflag(handle, ns_f_ra))
                  fprintf(file, " ra");
            if (ns_msg_getflag(handle, ns_f_z))
                  fprintf(file, " ??");
            if (ns_msg_getflag(handle, ns_f_ad))
                  fprintf(file, " ad");
            if (ns_msg_getflag(handle, ns_f_cd))
                  fprintf(file, " cd");
      }
      if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEAD1)) {
            fprintf(file, "; %s: %d",
                  p_section(ns_s_qd, opcode), qdcount);
            fprintf(file, ", %s: %d",
                  p_section(ns_s_an, opcode), ancount);
            fprintf(file, ", %s: %d",
                  p_section(ns_s_ns, opcode), nscount);
            fprintf(file, ", %s: %d",
                  p_section(ns_s_ar, opcode), arcount);
      }
      if ((!statp->pfcode) || (statp->pfcode &
            (RES_PRF_HEADX | RES_PRF_HEAD2 | RES_PRF_HEAD1))) {
            putc('\n',file);
      }
      /*
       * Print the various sections.
       */
      do_section(statp, &handle, ns_s_qd, RES_PRF_QUES, file);
      do_section(statp, &handle, ns_s_an, RES_PRF_ANS, file);
      do_section(statp, &handle, ns_s_ns, RES_PRF_AUTH, file);
      do_section(statp, &handle, ns_s_ar, RES_PRF_ADD, file);
      if (qdcount == 0 && ancount == 0 &&
          nscount == 0 && arcount == 0)
            putc('\n', file);
}

const u_char *
p_cdnname(const u_char *cp, const u_char *msg, int len, FILE *file) {
      char name[MAXDNAME];
      int n;

      if ((n = dn_expand(msg, msg + len, cp, name, sizeof name)) < 0)
            return (NULL);
      if (name[0] == '\0')
            putc('.', file);
      else
            fputs(name, file);
      return (cp + n);
}

const u_char *
p_cdname(const u_char *cp, const u_char *msg, FILE *file) {
      return (p_cdnname(cp, msg, PACKETSZ, file));
}

/* Return a fully-qualified domain name from a compressed name (with
   length supplied).  */

const u_char *
p_fqnname(cp, msg, msglen, name, namelen)
      const u_char *cp, *msg;
      int msglen;
      char *name;
      int namelen;
{
      int n, newlen;

      if ((n = dn_expand(msg, cp + msglen, cp, name, namelen)) < 0)
            return (NULL);
      newlen = strlen(name);
      if (newlen == 0 || name[newlen - 1] != '.') {
            if (newlen + 1 >= namelen)    /* Lack space for final dot */
                  return (NULL);
            else
                  strcpy(name + newlen, ".");
      }
      return (cp + n);
}

/* XXX:     the rest of these functions need to become length-limited, too. */

const u_char *
p_fqname(const u_char *cp, const u_char *msg, FILE *file) {
      char name[MAXDNAME];
      const u_char *n;

      n = p_fqnname(cp, msg, MAXCDNAME, name, sizeof name);
      if (n == NULL)
            return (NULL);
      fputs(name, file);
      return (n);
}

/*
 * Names of RR classes and qclasses.  Classes and qclasses are the same, except
 * that C_ANY is a qclass but not a class.  (You can ask for records of class
 * C_ANY, but you can't have any records of that class in the database.)
 */
const struct res_sym __p_class_syms[] = {
      {C_IN,            "IN"},
      {C_CHAOS,   "CHAOS"},
      {C_HS,            "HS"},
      {C_HS,            "HESIOD"},
      {C_ANY,           "ANY"},
      {C_NONE,    "NONE"},
      {C_IN,            (char *)0}
};

/*
 * Names of message sections.
 */
const struct res_sym __p_default_section_syms[] = {
      {ns_s_qd,   "QUERY"},
      {ns_s_an,   "ANSWER"},
      {ns_s_ns,   "AUTHORITY"},
      {ns_s_ar,   "ADDITIONAL"},
      {0,             (char *)0}
};

const struct res_sym __p_update_section_syms[] = {
      {S_ZONE,    "ZONE"},
      {S_PREREQ,  "PREREQUISITE"},
      {S_UPDATE,  "UPDATE"},
      {S_ADDT,    "ADDITIONAL"},
      {0,             (char *)0}
};

const struct res_sym __p_key_syms[] = {
      {NS_ALG_MD5RSA,         "RSA",            "RSA KEY with MD5 hash"},
      {NS_ALG_DH,       "DH",       "Diffie Hellman"},
      {NS_ALG_DSA,            "DSA",            "Digital Signature Algorithm"},
      {NS_ALG_EXPIRE_ONLY,    "EXPIREONLY",     "No algorithm"},
      {NS_ALG_PRIVATE_OID,    "PRIVATE",  "Algorithm obtained from OID"},
      {0,               NULL,       NULL}
};

const struct res_sym __p_cert_syms[] = {
      {cert_t_pkix,     "PKIX",           "PKIX (X.509v3) Certificate"},
      {cert_t_spki,     "SPKI",           "SPKI certificate"},
      {cert_t_pgp,      "PGP",            "PGP certificate"},
      {cert_t_url,      "URL",            "URL Private"},
      {cert_t_oid,      "OID",            "OID Private"},
      {0,         NULL,       NULL}
};

/*
 * Names of RR types and qtypes.  Types and qtypes are the same, except
 * that T_ANY is a qtype but not a type.  (You can ask for records of type
 * T_ANY, but you can't have any records of that type in the database.)
 */
const struct res_sym __p_type_syms[] = {
      {ns_t_a,    "A",        "address"},
      {ns_t_ns,   "NS",       "name server"},
      {ns_t_md,   "MD",       "mail destination (deprecated)"},
      {ns_t_mf,   "MF",       "mail forwarder (deprecated)"},
      {ns_t_cname,      "CNAME",    "canonical name"},
      {ns_t_soa,  "SOA",            "start of authority"},
      {ns_t_mb,   "MB",       "mailbox"},
      {ns_t_mg,   "MG",       "mail group member"},
      {ns_t_mr,   "MR",       "mail rename"},
      {ns_t_null, "NULL",           "null"},
      {ns_t_wks,  "WKS",            "well-known service (deprecated)"},
      {ns_t_ptr,  "PTR",            "domain name pointer"},
      {ns_t_hinfo,      "HINFO",    "host information"},
      {ns_t_minfo,      "MINFO",    "mailbox information"},
      {ns_t_mx,   "MX",       "mail exchanger"},
      {ns_t_txt,  "TXT",            "text"},
      {ns_t_rp,   "RP",       "responsible person"},
      {ns_t_afsdb,      "AFSDB",    "DCE or AFS server"},
      {ns_t_x25,  "X25",            "X25 address"},
      {ns_t_isdn, "ISDN",           "ISDN address"},
      {ns_t_rt,   "RT",       "router"},
      {ns_t_nsap, "NSAP",           "nsap address"},
      {ns_t_nsap_ptr,   "NSAP_PTR", "domain name pointer"},
      {ns_t_sig,  "SIG",            "signature"},
      {ns_t_key,  "KEY",            "key"},
      {ns_t_px,   "PX",       "mapping information"},
      {ns_t_gpos, "GPOS",           "geographical position (withdrawn)"},
      {ns_t_aaaa, "AAAA",           "IPv6 address"},
      {ns_t_loc,  "LOC",            "location"},
      {ns_t_nxt,  "NXT",            "next valid name (unimplemented)"},
      {ns_t_eid,  "EID",            "endpoint identifier (unimplemented)"},
      {ns_t_nimloc,     "NIMLOC",   "NIMROD locator (unimplemented)"},
      {ns_t_srv,  "SRV",            "server selection"},
      {ns_t_atma, "ATMA",           "ATM address (unimplemented)"},
      {ns_t_tsig, "TSIG",           "transaction signature"},
      {ns_t_ixfr, "IXFR",           "incremental zone transfer"},
      {ns_t_axfr, "AXFR",           "zone transfer"},
      {ns_t_zxfr, "ZXFR",           "compressed zone transfer"},
      {ns_t_mailb,      "MAILB",    "mailbox-related data (deprecated)"},
      {ns_t_maila,      "MAILA",    "mail agent (deprecated)"},
      {ns_t_naptr,      "NAPTR",    "URN Naming Authority"},
      {ns_t_kx,   "KX",       "Key Exchange"},
      {ns_t_cert, "CERT",           "Certificate"},
      {ns_t_any,  "ANY",            "\"any\""},
      {0,         NULL,       NULL}
};

/*
 * Names of DNS rcodes.
 */
const struct res_sym __p_rcode_syms[] = {
      {ns_r_noerror,    "NOERROR",        "no error"},
      {ns_r_formerr,    "FORMERR",        "format error"},
      {ns_r_servfail,   "SERVFAIL",       "server failed"},
      {ns_r_nxdomain,   "NXDOMAIN",       "no such domain name"},
      {ns_r_notimpl,    "NOTIMP",         "not implemented"},
      {ns_r_refused,    "REFUSED",        "refused"},
      {ns_r_yxdomain,   "YXDOMAIN",       "domain name exists"},
      {ns_r_yxrrset,    "YXRRSET",        "rrset exists"},
      {ns_r_nxrrset,    "NXRRSET",        "rrset doesn't exist"},
      {ns_r_notauth,    "NOTAUTH",        "not authoritative"},
      {ns_r_notzone,    "NOTZONE",        "Not in zone"},
      {ns_r_max,  "",               ""},
      {ns_r_badsig,     "BADSIG",         "bad signature"},
      {ns_r_badkey,     "BADKEY",         "bad key"},
      {ns_r_badtime,    "BADTIME",        "bad time"},
      {0,         NULL,             NULL}
};

int
sym_ston(const struct res_sym *syms, const char *name, int *success) {
      for ((void)NULL; syms->name != 0; syms++) {
            if (strcasecmp (name, syms->name) == 0) {
                  if (success)
                        *success = 1;
                  return (syms->number);
            }
      }
      if (success)
            *success = 0;
      return (syms->number);        /* The default value. */
}

const char *
sym_ntos(const struct res_sym *syms, int number, int *success) {
      static char unname[20];

      for ((void)NULL; syms->name != 0; syms++) {
            if (number == syms->number) {
                  if (success)
                        *success = 1;
                  return (syms->name);
            }
      }

      sprintf(unname, "%d", number);            /* XXX nonreentrant */
      if (success)
            *success = 0;
      return (unname);
}

const char *
sym_ntop(const struct res_sym *syms, int number, int *success) {
      static char unname[20];

      for ((void)NULL; syms->name != 0; syms++) {
            if (number == syms->number) {
                  if (success)
                        *success = 1;
                  return (syms->humanname);
            }
      }
      sprintf(unname, "%d", number);            /* XXX nonreentrant */
      if (success)
            *success = 0;
      return (unname);
}

/*
 * Return a string for the type.
 */
const char *
p_type(int type) {
      return (sym_ntos(__p_type_syms, type, (int *)0));
}

/*
 * Return a string for the type.
 */
const char *
p_section(int section, int opcode) {
      const struct res_sym *symbols;

      switch (opcode) {
      case ns_o_update:
            symbols = __p_update_section_syms;
            break;
      default:
            symbols = __p_default_section_syms;
            break;
      }
      return (sym_ntos(symbols, section, (int *)0));
}

/*
 * Return a mnemonic for class.
 */
const char *
p_class(int class) {
      return (sym_ntos(__p_class_syms, class, (int *)0));
}

/*
 * Return a mnemonic for an option
 */
const char *
p_option(u_long option) {
      static char nbuf[40];

      switch (option) {
      case RES_INIT:          return "init";
      case RES_DEBUG:         return "debug";
      case RES_AAONLY:  return "aaonly(unimpl)";
      case RES_USEVC:         return "usevc";
      case RES_PRIMARY: return "primry(unimpl)";
      case RES_IGNTC:         return "igntc";
      case RES_RECURSE: return "recurs";
      case RES_DEFNAMES:      return "defnam";
      case RES_STAYOPEN:      return "styopn";
      case RES_DNSRCH:  return "dnsrch";
      case RES_INSECURE1:     return "insecure1";
      case RES_INSECURE2:     return "insecure2";
                        /* XXX nonreentrant */
      default:          sprintf(nbuf, "?0x%lx?", (u_long)option);
                        return (nbuf);
      }
}

/*
 * Return a mnemonic for a time to live.
 */
const char *
p_time(u_int32_t value) {
      static char nbuf[40];         /* XXX nonreentrant */

      if (ns_format_ttl(value, nbuf, sizeof nbuf) < 0)
            sprintf(nbuf, "%u", value);
      return (nbuf);
}

/*
 * Return a string for the rcode.
 */
const char *
p_rcode(int rcode) {
      return (sym_ntos(__p_rcode_syms, rcode, (int *)0));
}

/*
 * routines to convert between on-the-wire RR format and zone file format.
 * Does not contain conversion to/from decimal degrees; divide or multiply
 * by 60*60*1000 for that.
 */

static unsigned int poweroften[10] = {1, 10, 100, 1000, 10000, 100000,
                              1000000,10000000,100000000,1000000000};

/* takes an XeY precision/size value, returns a string representation. */
static const char *
precsize_ntoa(prec)
      u_int8_t prec;
{
      static char retbuf[sizeof "90000000.00"]; /* XXX nonreentrant */
      unsigned long val;
      int mantissa, exponent;

      mantissa = (int)((prec >> 4) & 0x0f) % 10;
      exponent = (int)((prec >> 0) & 0x0f) % 10;

      val = mantissa * poweroften[exponent];

      (void) sprintf(retbuf, "%ld.%.2ld", val/100, val%100);
      return (retbuf);
}

/* converts ascii size/precision X * 10**Y(cm) to 0xXY.  moves pointer. */
static u_int8_t
precsize_aton(strptr)
      const char **strptr;
{
      unsigned int mval = 0, cmval = 0;
      u_int8_t retval = 0;
      const char *cp;
      int exponent;
      int mantissa;

      cp = *strptr;

      while (isdigit(*cp))
            mval = mval * 10 + (*cp++ - '0');

      if (*cp == '.') {       /* centimeters */
            cp++;
            if (isdigit(*cp)) {
                  cmval = (*cp++ - '0') * 10;
                  if (isdigit(*cp)) {
                        cmval += (*cp++ - '0');
                  }
            }
      }
      cmval = (mval * 100) + cmval;

      for (exponent = 0; exponent < 9; exponent++)
            if (cmval < poweroften[exponent+1])
                  break;

      mantissa = cmval / poweroften[exponent];
      if (mantissa > 9)
            mantissa = 9;

      retval = (mantissa << 4) | exponent;

      *strptr = cp;

      return (retval);
}

/* converts ascii lat/lon to unsigned encoded 32-bit number.  moves pointer. */
static u_int32_t
latlon2ul(latlonstrptr,which)
      const char **latlonstrptr;
      int *which;
{
      const char *cp;
      u_int32_t retval;
      int deg = 0, min = 0, secs = 0, secsfrac = 0;

      cp = *latlonstrptr;

      while (isdigit(*cp))
            deg = deg * 10 + (*cp++ - '0');

      while (isspace(*cp))
            cp++;

      if (!(isdigit(*cp)))
            goto fndhemi;

      while (isdigit(*cp))
            min = min * 10 + (*cp++ - '0');

      while (isspace(*cp))
            cp++;

      if (!(isdigit(*cp)))
            goto fndhemi;

      while (isdigit(*cp))
            secs = secs * 10 + (*cp++ - '0');

      if (*cp == '.') {       /* decimal seconds */
            cp++;
            if (isdigit(*cp)) {
                  secsfrac = (*cp++ - '0') * 100;
                  if (isdigit(*cp)) {
                        secsfrac += (*cp++ - '0') * 10;
                        if (isdigit(*cp)) {
                              secsfrac += (*cp++ - '0');
                        }
                  }
            }
      }

      while (!isspace(*cp))   /* if any trailing garbage */
            cp++;

      while (isspace(*cp))
            cp++;

 fndhemi:
      switch (*cp) {
      case 'N': case 'n':
      case 'E': case 'e':
            retval = ((unsigned)1<<31)
                  + (((((deg * 60) + min) * 60) + secs) * 1000)
                  + secsfrac;
            break;
      case 'S': case 's':
      case 'W': case 'w':
            retval = ((unsigned)1<<31)
                  - (((((deg * 60) + min) * 60) + secs) * 1000)
                  - secsfrac;
            break;
      default:
            retval = 0; /* invalid value -- indicates error */
            break;
      }

      switch (*cp) {
      case 'N': case 'n':
      case 'S': case 's':
            *which = 1; /* latitude */
            break;
      case 'E': case 'e':
      case 'W': case 'w':
            *which = 2; /* longitude */
            break;
      default:
            *which = 0; /* error */
            break;
      }

      cp++;             /* skip the hemisphere */

      while (!isspace(*cp))   /* if any trailing garbage */
            cp++;

      while (isspace(*cp))    /* move to next field */
            cp++;

      *latlonstrptr = cp;

      return (retval);
}

/* converts a zone file representation in a string to an RDATA on-the-wire
 * representation. */
int
loc_aton(ascii, binary)
      const char *ascii;
      u_char *binary;
{
      const char *cp, *maxcp;
      u_char *bcp;

      u_int32_t latit = 0, longit = 0, alt = 0;
      u_int32_t lltemp1 = 0, lltemp2 = 0;
      int altmeters = 0, altfrac = 0, altsign = 1;
      u_int8_t hp = 0x16;     /* default = 1e6 cm = 10000.00m = 10km */
      u_int8_t vp = 0x13;     /* default = 1e3 cm = 10.00m */
      u_int8_t siz = 0x12;    /* default = 1e2 cm = 1.00m */
      int which1 = 0, which2 = 0;

      cp = ascii;
      maxcp = cp + strlen(ascii);

      lltemp1 = latlon2ul(&cp, &which1);

      lltemp2 = latlon2ul(&cp, &which2);

      switch (which1 + which2) {
      case 3:                 /* 1 + 2, the only valid combination */
            if ((which1 == 1) && (which2 == 2)) { /* normal case */
                  latit = lltemp1;
                  longit = lltemp2;
            } else if ((which1 == 2) && (which2 == 1)) { /* reversed */
                  longit = lltemp1;
                  latit = lltemp2;
            } else {    /* some kind of brokenness */
                  return (0);
            }
            break;
      default:          /* we didn't get one of each */
            return (0);
      }

      /* altitude */
      if (*cp == '-') {
            altsign = -1;
            cp++;
      }

      if (*cp == '+')
            cp++;

      while (isdigit(*cp))
            altmeters = altmeters * 10 + (*cp++ - '0');

      if (*cp == '.') {       /* decimal meters */
            cp++;
            if (isdigit(*cp)) {
                  altfrac = (*cp++ - '0') * 10;
                  if (isdigit(*cp)) {
                        altfrac += (*cp++ - '0');
                  }
            }
      }

      alt = (10000000 + (altsign * (altmeters * 100 + altfrac)));

      while (!isspace(*cp) && (cp < maxcp)) /* if trailing garbage or m */
            cp++;

      while (isspace(*cp) && (cp < maxcp))
            cp++;

      if (cp >= maxcp)
            goto defaults;

      siz = precsize_aton(&cp);

      while (!isspace(*cp) && (cp < maxcp))     /* if trailing garbage or m */
            cp++;

      while (isspace(*cp) && (cp < maxcp))
            cp++;

      if (cp >= maxcp)
            goto defaults;

      hp = precsize_aton(&cp);

      while (!isspace(*cp) && (cp < maxcp))     /* if trailing garbage or m */
            cp++;

      while (isspace(*cp) && (cp < maxcp))
            cp++;

      if (cp >= maxcp)
            goto defaults;

      vp = precsize_aton(&cp);

 defaults:

      bcp = binary;
      *bcp++ = (u_int8_t) 0;  /* version byte */
      *bcp++ = siz;
      *bcp++ = hp;
      *bcp++ = vp;
      PUTLONG(latit,bcp);
      PUTLONG(longit,bcp);
      PUTLONG(alt,bcp);

      return (16);            /* size of RR in octets */
}

/* takes an on-the-wire LOC RR and formats it in a human readable format. */
const char *
loc_ntoa(binary, ascii)
      const u_char *binary;
      char *ascii;
{
      static char *error = "?";
      static char tmpbuf[sizeof
"1000 60 60.000 N 1000 60 60.000 W -12345678.00m 90000000.00m 90000000.00m 90000000.00m"];
      const u_char *cp = binary;

      int latdeg, latmin, latsec, latsecfrac;
      int longdeg, longmin, longsec, longsecfrac;
      char northsouth, eastwest;
      int altmeters, altfrac, altsign;

      const u_int32_t referencealt = 100000 * 100;

      int32_t latval, longval, altval;
      u_int32_t templ;
      u_int8_t sizeval, hpval, vpval, versionval;

      char *sizestr, *hpstr, *vpstr;

      versionval = *cp++;

      if (ascii == NULL)
            ascii = tmpbuf;

      if (versionval) {
            (void) sprintf(ascii, "; error: unknown LOC RR version");
            return (ascii);
      }

      sizeval = *cp++;

      hpval = *cp++;
      vpval = *cp++;

      GETLONG(templ, cp);
      latval = (templ - ((unsigned)1<<31));

      GETLONG(templ, cp);
      longval = (templ - ((unsigned)1<<31));

      GETLONG(templ, cp);
      if (templ < referencealt) { /* below WGS 84 spheroid */
            altval = referencealt - templ;
            altsign = -1;
      } else {
            altval = templ - referencealt;
            altsign = 1;
      }

      if (latval < 0) {
            northsouth = 'S';
            latval = -latval;
      } else
            northsouth = 'N';

      latsecfrac = latval % 1000;
      latval = latval / 1000;
      latsec = latval % 60;
      latval = latval / 60;
      latmin = latval % 60;
      latval = latval / 60;
      latdeg = latval;

      if (longval < 0) {
            eastwest = 'W';
            longval = -longval;
      } else
            eastwest = 'E';

      longsecfrac = longval % 1000;
      longval = longval / 1000;
      longsec = longval % 60;
      longval = longval / 60;
      longmin = longval % 60;
      longval = longval / 60;
      longdeg = longval;

      altfrac = altval % 100;
      altmeters = (altval / 100) * altsign;

      if ((sizestr = strdup(precsize_ntoa(sizeval))) == NULL)
            sizestr = error;
      if ((hpstr = strdup(precsize_ntoa(hpval))) == NULL)
            hpstr = error;
      if ((vpstr = strdup(precsize_ntoa(vpval))) == NULL)
            vpstr = error;

      sprintf(ascii,
            "%d %.2d %.2d.%.3d %c %d %.2d %.2d.%.3d %c %d.%.2dm %sm %sm %sm",
            latdeg, latmin, latsec, latsecfrac, northsouth,
            longdeg, longmin, longsec, longsecfrac, eastwest,
            altmeters, altfrac, sizestr, hpstr, vpstr);

      if (sizestr != error)
            free(sizestr);
      if (hpstr != error)
            free(hpstr);
      if (vpstr != error)
            free(vpstr);

      return (ascii);
}


/* Return the number of DNS hierarchy levels in the name. */
int
dn_count_labels(const char *name) {
      int i, len, count;

      len = strlen(name);
      for (i = 0, count = 0; i < len; i++) {
            /* XXX need to check for \. or use named's nlabels(). */
            if (name[i] == '.')
                  count++;
      }

      /* don't count initial wildcard */
      if (name[0] == '*')
            if (count)
                  count--;

      /* don't count the null label for root. */
      /* if terminating '.' not found, must adjust */
      /* count to include last label */
      if (len > 0 && name[len-1] != '.')
            count++;
      return (count);
}


/*
 * Make dates expressed in seconds-since-Jan-1-1970 easy to read.
 * SIG records are required to be printed like this, by the Secure DNS RFC.
 */
char *
p_secstodate (u_long secs) {
      /* XXX nonreentrant */
      static char output[15];       /* YYYYMMDDHHMMSS and null */
      time_t clock = secs;
      struct tm *time;

#ifdef HAVE_TIME_R
      struct tm timebuf;

      time = gmtime_r(&clock, &timebuf);
#else
      time = gmtime(&clock);
#endif
      time->tm_year += 1900;
      time->tm_mon += 1;
      sprintf(output, "%04d%02d%02d%02d%02d%02d",
            time->tm_year, time->tm_mon, time->tm_mday,
            time->tm_hour, time->tm_min, time->tm_sec);
      return (output);
}

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