[glibc.git] / resolv / 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.
 */

/*
 * Copyright (c) 1995 IBM Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * 'Software'), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * 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.
 */

#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/resolv-internal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <shlib-compat.h>
#include <libc-diag.h>

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

extern const char *_res_sectioncodes[] attribute_hidden;

/* _res_opcodes was exported by accident as a variable.  */
#if SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_26)
static const char *res_opcodes[] =
#else
static const char res_opcodes[][9] =
#endif
  {
    "QUERY",
    "IQUERY",
    "CQUERYM",
    "CQUERYU",  /* experimental */
    "NOTIFY",   /* experimental */
    "UPDATE",
    "6",
    "7",
    "8",
    "9",
    "10",
    "11",
    "12",
    "13",
    "ZONEINIT",
    "ZONEREF",
  };
#if SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_26)
strong_alias (res_opcodes, _res_opcodes)
compat_symbol (libresolv, _res_opcodes, _res_opcodes, GLIBC_2_0);
#endif

static const char *p_section(int section, int opcode);

/*
 * 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 (int pfcode, 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 = (pfcode & pflag);
        if (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 &&
                                 (pfcode & RES_PRF_HEAD1))
                                putc('\n', file);
                        goto cleanup;
                }
                if (rrnum == 0 && sflag != 0 && (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:
        free(buf);
}

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

        /* There is no need to initialize _res: If _res is not yet
           initialized, _res.pfcode is zero.  But initialization will
           leave it at zero, too.  _res.pfcode is an unsigned long,
           but the code here assumes that the flags fit into an int,
           so use that.  */
        int pfcode = _res.pfcode;

        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 ((!pfcode) || (pfcode & RES_PRF_HEADX) || rcode)
                fprintf(file,
                        ";; ->>HEADER<<- opcode: %s, status: %s, id: %d\n",
                        res_opcodes[opcode], p_rcode(rcode), id);
        if ((!pfcode) || (pfcode & RES_PRF_HEADX))
                putc(';', file);
        if ((!pfcode) || (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 ((!pfcode) || (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 ((!pfcode) || (pfcode &
                (RES_PRF_HEADX | RES_PRF_HEAD2 | RES_PRF_HEAD1))) {
                putc('\n',file);
        }
        /*
         * Print the various sections.
         */
        do_section (pfcode, &handle, ns_s_qd, RES_PRF_QUES, file);
        do_section (pfcode, &handle, ns_s_an, RES_PRF_ANS, file);
        do_section (pfcode, &handle, ns_s_ns, RES_PRF_AUTH, file);
        do_section (pfcode, &handle, ns_s_ar, RES_PRF_ADD, file);
        if (qdcount == 0 && ancount == 0 &&
            nscount == 0 && arcount == 0)
                putc('\n', file);
}
libresolv_hidden_def (fp_nquery)

void
fp_query (const unsigned char *msg, FILE *file)
{
  fp_nquery (msg, PACKETSZ, file);
}
libresolv_hidden_def (fp_query)

void
p_query (const unsigned char *msg)
{
  fp_query (msg, stdout);
}

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

        if ((n = __libc_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);
}
libresolv_hidden_def (p_cdnname)

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

        if ((n = __libc_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);
}
libresolv_hidden_def (p_fqnname)

/* 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.)
 */
extern const struct res_sym __p_class_syms[];
libresolv_hidden_proto (__p_class_syms)
const struct res_sym __p_class_syms[] = {
  {C_IN,    (char *) "IN"},
  {C_CHAOS, (char *) "CHAOS"},
  {C_HS,    (char *) "HS"},
  {C_HS,    (char *) "HESIOD"},
  {C_ANY,   (char *) "ANY"},
  {C_NONE,  (char *) "NONE"},
  {C_IN, NULL, NULL}
};
libresolv_hidden_data_def (__p_class_syms)

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

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

/*
 * Names of RR types and qtypes.  The list is incomplete because its
 * size is part of the ABI.
 */
extern const struct res_sym __p_type_syms[];
libresolv_hidden_proto (__p_type_syms)
const struct res_sym __p_type_syms[] = {
  {ns_t_a,      (char *) "A",     (char *) "address"},
  {ns_t_ns,     (char *) "NS",    (char *) "name server"},
  {ns_t_md,     (char *) "MD",    (char *) "mail destination (deprecated)"},
  {ns_t_mf,     (char *) "MF",    (char *) "mail forwarder (deprecated)"},
  {ns_t_cname,  (char *) "CNAME", (char *) "canonical name"},
  {ns_t_soa,    (char *) "SOA",   (char *) "start of authority"},
  {ns_t_mb,     (char *) "MB",    (char *) "mailbox"},
  {ns_t_mg,     (char *) "MG",    (char *) "mail group member"},
  {ns_t_mr,     (char *) "MR",    (char *) "mail rename"},
  {ns_t_null,   (char *) "NULL",  (char *) "null"},
  {ns_t_wks,    (char *) "WKS",   (char *) "well-known service (deprecated)"},
  {ns_t_ptr,    (char *) "PTR",   (char *) "domain name pointer"},
  {ns_t_hinfo,  (char *) "HINFO", (char *) "host information"},
  {ns_t_minfo,  (char *) "MINFO", (char *) "mailbox information"},
  {ns_t_mx,     (char *) "MX",    (char *) "mail exchanger"},
  {ns_t_txt,    (char *) "TXT",   (char *) "text"},
  {ns_t_rp,     (char *) "RP",    (char *) "responsible person"},
  {ns_t_afsdb,  (char *) "AFSDB", (char *) "DCE or AFS server"},
  {ns_t_x25,    (char *) "X25",   (char *) "X25 address"},
  {ns_t_isdn,   (char *) "ISDN",  (char *) "ISDN address"},
  {ns_t_rt,     (char *) "RT",    (char *) "router"},
  {ns_t_nsap,   (char *) "NSAP",  (char *) "nsap address"},
  {ns_t_nsap_ptr, (char *) "NSAP_PTR", (char *) "domain name pointer"},
  {ns_t_sig,    (char *) "SIG",   (char *) "signature"},
  {ns_t_key,    (char *) "KEY",   (char *) "key"},
  {ns_t_px,     (char *) "PX",    (char *) "mapping information"},
  {ns_t_gpos,   (char *) "GPOS",
   (char *) "geographical position (withdrawn)"},
  {ns_t_aaaa,   (char *) "AAAA",  (char *) "IPv6 address"},
  {ns_t_loc,    (char *) "LOC",   (char *) "location"},
  {ns_t_nxt,    (char *) "NXT",   (char *) "next valid name (unimplemented)"},
  {ns_t_eid,    (char *) "EID",   (char *) "endpoint identifier (unimplemented)"},
  {ns_t_nimloc, (char *) "NIMLOC", (char *) "NIMROD locator (unimplemented)"},
  {ns_t_srv,    (char *) "SRV",   (char *) "server selection"},
  {ns_t_atma,   (char *) "ATMA",  (char *) "ATM address (unimplemented)"},
  {ns_t_dname,  (char *) "DNAME", (char *) "Non-terminal DNAME (for IPv6)"},
  {ns_t_tsig,   (char *) "TSIG",  (char *) "transaction signature"},
  {ns_t_ixfr,   (char *) "IXFR",  (char *) "incremental zone transfer"},
  {ns_t_axfr,   (char *) "AXFR",  (char *) "zone transfer"},
  {ns_t_mailb,  (char *) "MAILB", (char *) "mailbox-related data (deprecated)"},
  {ns_t_maila,  (char *) "MAILA", (char *) "mail agent (deprecated)"},
  {ns_t_naptr,  (char *) "NAPTR", (char *) "URN Naming Authority"},
  {ns_t_kx,     (char *) "KX",    (char *) "Key Exchange"},
  {ns_t_cert,   (char *) "CERT",  (char *) "Certificate"},
  {ns_t_any,    (char *) "ANY",   (char *) "\"any\""},
  {0, NULL, NULL},              /* Padding to preserve ABI.  */
  {0, NULL, NULL}
};
libresolv_hidden_data_def (__p_type_syms)

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

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));
}
libresolv_hidden_def (p_type)

/*
 * Return a string for the type.
 */
static 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));
}
libresolv_hidden_def (p_class)

/*
 * 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_USEVC:         return "use-vc";
        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_NOALIASES:     return "noaliases";
        case RES_ROTATE:        return "rotate";
        case RES_USE_EDNS0:     return "edns0";
        case RES_SNGLKUP:       return "single-request";
        case RES_SNGLKUPREOP:   return "single-request-reopen";
        case RES_USE_DNSSEC:    return "dnssec";
        case RES_NOTLDQUERY:    return "no-tld-query";
        case RES_NORELOAD:      return "no-reload";
        case RES_TRUSTAD:       return "trust-ad";
        case RES_NOAAAA:        return "no-aaaa";
                                /* XXX nonreentrant */
        default:                sprintf(nbuf, "?0x%lx?", (u_long)option);
                                return (nbuf);
        }
}
libresolv_hidden_def (p_option)

/*
 * Return a mnemonic for a time to live.
 */
const char *
p_time(uint32_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));
}
libresolv_hidden_def (p_rcode)

/*
 * 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 const 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 (uint8_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 uint8_t
precsize_aton (const char **strptr)
{
        unsigned int mval = 0, cmval = 0;
        uint8_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 uint32_t
latlon2ul (const char **latlonstrptr, int *which)
{
        const char *cp;
        uint32_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 (const char *ascii, u_char *binary)
{
        const char *cp, *maxcp;
        u_char *bcp;

        uint32_t latit = 0, longit = 0, alt = 0;
        uint32_t lltemp1 = 0, lltemp2 = 0;
        int altmeters = 0, altfrac = 0, altsign = 1;
        uint8_t hp = 0x16;      /* default = 1e6 cm = 10000.00m = 10km */
        uint8_t vp = 0x13;      /* default = 1e3 cm = 10.00m */
        uint8_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++ = (uint8_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 (const u_char *binary, char *ascii)
{
        static const 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 uint32_t referencealt = 100000 * 100;

        int32_t latval, longval, altval;
        uint32_t templ;
        uint8_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 = (char *) error;
        if ((hpstr = strdup(precsize_ntoa(hpval))) == NULL)
                hpstr = (char *) error;
        if ((vpstr = strdup(precsize_ntoa(vpval))) == NULL)
                vpstr = (char *) 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 != (char *) error)
                free(sizestr);
        if (hpstr != (char *) error)
                free(hpstr);
        if (vpstr != (char *) error)
                free(vpstr);

        return (ascii);
}
libresolv_hidden_def (loc_ntoa)


/* 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);
}
libresolv_hidden_def (__dn_count_labels)


#if SHLIB_COMPAT (libresolv, GLIBC_2_0, GLIBC_2_27)
/*
 * 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.
 * This is an obsolescent function and does not handle dates outside the
 * signed 32-bit range.
 */
char *
__p_secstodate (u_long secs) {
        /* XXX nonreentrant */
        static char output[15];         /* YYYYMMDDHHMMSS and null */
        time_t clock = secs;
        struct tm *time;

        struct tm timebuf;
        /* The call to __gmtime_r can never produce a year overflowing
           the range of int, given the check on SECS, but check for a
           NULL return anyway to avoid a null pointer dereference in
           case there are any other unspecified errors.  */
        if (secs > 0x7fffffff
            || (time = __gmtime_r (&clock, &timebuf)) == NULL) {
                strcpy (output, "<overflow>");
                __set_errno (EOVERFLOW);
                return output;
        }
        time->tm_year += 1900;
        time->tm_mon += 1;
        /* The struct tm fields, given the above range check,
           must have values that mean this sprintf exactly fills the
           buffer.  But as of GCC 8 of 2017-11-21, GCC cannot tell
           that, even given range checks on all fields with
           __builtin_unreachable called for out-of-range values.  */
        DIAG_PUSH_NEEDS_COMMENT;
# if __GNUC_PREREQ (7, 0)
        DIAG_IGNORE_NEEDS_COMMENT (8, "-Wformat-overflow=");
# endif
        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);
        DIAG_POP_NEEDS_COMMENT;
        return (output);
}
compat_symbol (libresolv, __p_secstodate, __p_secstodate, GLIBC_2_0);
#endif