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/*

 * Copyright (c) 1995-1999 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 rcsid[] = "$BINDId: res_data.c,v 8.17 1999/10/13 17:11:31 vixie Exp $";

#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>

#include <sys/param.h>

#include <sys/socket.h>

#include <sys/time.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <arpa/nameser.h>

#include <ctype.h>

#include <netdb.h>

#include <resolv.h>

#ifdef BIND_UPDATE

#include <res_update.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include "libc-symbols.h"

const char *_res_opcodes[] = {

        "QUERY",

        "IQUERY",

        "CQUERYM",

        "CQUERYU",      /* experimental */

        "NOTIFY",       /* experimental */

        "UPDATE",

        "6",

        "7",

        "8",

        "9",

        "10",

        "11",

        "12",

        "13",

        "ZONEINIT",

        "ZONEREF",

};

libresolv_hidden_data_def (_res_opcodes)

#ifdef BIND_UPDATE

const char *_res_sectioncodes[] attribute_hidden = {

        "ZONE",

        "PREREQUISITES",

        "UPDATE",

        "ADDITIONAL",

};

#endif

#ifndef __BIND_NOSTATIC

#ifdef _LIBC

/* The definition has been moved to res_libc.c.  */

#else

#undef _res

struct __res_state _res

# if defined(__BIND_RES_TEXT)

        = { RES_TIMEOUT, }      /* Motorola, et al. */

# endif

        ;

#endif

/* Proto. */

#ifndef _LIBC

int  res_ourserver_p(const res_state, const struct sockaddr_in *);

void res_pquery(const res_state, const u_char *, int, FILE *);

#endif

#ifndef _LIBC

/* Moved to res_libc.c since res_init() should go into libc.so but the

   rest of this file not.  */

int

res_init(void) {

        extern int __res_vinit(res_state, int);

        /*

         * These three fields used to be statically initialized.  This made

         * it hard to use this code in a shared library.  It is necessary,

         * now that we're doing dynamic initialization here, that we preserve

         * the old semantics: if an application modifies one of these three

         * fields of _res before res_init() is called, res_init() will not

         * alter them.  Of course, if an application is setting them to

         * _zero_ before calling res_init(), hoping to override what used

         * to be the static default, we can't detect it and unexpected results

         * will follow.  Zero for any of these fields would make no sense,

         * so one can safely assume that the applications were already getting

         * unexpected results.

         *

         * _res.options is tricky since some apps were known to diddle the bits

         * before res_init() was first called. We can't replicate that semantic

         * with dynamic initialization (they may have turned bits off that are

         * set in RES_DEFAULT).  Our solution is to declare such applications

         * "broken".  They could fool us by setting RES_INIT but none do (yet).

         */

        if (!_res.retrans)

                _res.retrans = RES_TIMEOUT;

        if (!_res.retry)

                _res.retry = 4;

        if (!(_res.options & RES_INIT))

                _res.options = RES_DEFAULT;

        /*

         * This one used to initialize implicitly to zero, so unless the app

         * has set it to something in particular, we can randomize it now.

         */

        if (!_res.id)

                _res.id = res_randomid();

        return (__res_vinit(&_res, 1));

}

#endif

void

p_query(const u_char *msg) {

        fp_query(msg, stdout);

}

void

fp_query(const u_char *msg, FILE *file) {

        fp_nquery(msg, PACKETSZ, file);

}

libresolv_hidden_def (fp_query)

void

fp_nquery(const u_char *msg, int len, FILE *file) {

        if (__res_maybe_init (&_res, 0) == -1)

                return;

        res_pquery(&_res, msg, len, file);

}

libresolv_hidden_def (fp_nquery)

int

res_mkquery(int op,                     /* opcode of query */

            const char *dname,          /* domain name */

            int class, int type,        /* class and type of query */

            const u_char *data,         /* resource record data */

            int datalen,                /* length of data */

            const u_char *newrr_in,     /* new rr for modify or append */

            u_char *buf,                /* buffer to put query */

            int buflen)                 /* size of buffer */

{

        if (__res_maybe_init (&_res, 1) == -1) {

                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);

                return (-1);

        }

        return (res_nmkquery(&_res, op, dname, class, type,

                             data, datalen,

                             newrr_in, buf, buflen));

}

#ifdef BIND_UPDATE

int

res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {

        if (__res_maybe_init (&_res, 1) == -1) {

                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);

                return (-1);

        }

        return (res_nmkupdate(&_res, rrecp_in, buf, buflen));

}

#endif

int

res_query(const char *name,     /* domain name */

          int class, int type,  /* class and type of query */

          u_char *answer,       /* buffer to put answer */

          int anslen)           /* size of answer buffer */

{

        if (__res_maybe_init (&_res, 1) == -1) {

                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);

                return (-1);

        }

        return (res_nquery(&_res, name, class, type, answer, anslen));

}

void

res_send_setqhook(res_send_qhook hook) {

        _res.qhook = hook;

}

void

res_send_setrhook(res_send_rhook hook) {

        _res.rhook = hook;

}

int

res_isourserver(const struct sockaddr_in *inp) {

        return (res_ourserver_p(&_res, (const struct sockaddr_in6 *) inp));

}

int

res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {

        if (__res_maybe_init (&_res, 1) == -1) {

                /* errno should have been set by res_init() in this case. */

                return (-1);

        }

        return (res_nsend(&_res, buf, buflen, ans, anssiz));

}

#ifndef _LIBC

int

res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,

               u_char *ans, int anssiz)

{

        if (__res_maybe_init (&_res, 1) == -1) {

                /* errno should have been set by res_init() in this case. */

                return (-1);

        }

        return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz));

}

#endif

void

res_close(void) {

#ifdef _LIBC

        /*

         * Some stupid programs out there call res_close() before res_init().

         * Since _res._vcsock isn't explicitly initialized, these means that

         * we could do a close(0), which might lead to some security problems.

         * Therefore we check if res_init() was called before by looking at

         * the RES_INIT bit in _res.options.  If it hasn't been set we bail out

         * early.  */

        if ((_res.options & RES_INIT) == 0)

          return;

#endif

        res_nclose(&_res);

}

#ifdef BIND_UPDATE

int

res_update(ns_updrec *rrecp_in) {

        if (__res_maybe_init (&_res, 1) == -1) {

                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);

                return (-1);

        }

        return (res_nupdate(&_res, rrecp_in, NULL));

}

#endif

int

res_search(const char *name,    /* domain name */

           int class, int type, /* class and type of query */

           u_char *answer,      /* buffer to put answer */

           int anslen)          /* size of answer */

{

        if (__res_maybe_init (&_res, 1) == -1) {

                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);

                return (-1);

        }

        return (res_nsearch(&_res, name, class, type, answer, anslen));

}

int

res_querydomain(const char *name,

                const char *domain,

                int class, int type,    /* class and type of query */

                u_char *answer,         /* buffer to put answer */

                int anslen)             /* size of answer */

{

        if (__res_maybe_init (&_res, 1) == -1) {

                RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);

                return (-1);

        }

        return (res_nquerydomain(&_res, name, domain,

                                 class, type,

                                 answer, anslen));

}

const char *

hostalias(const char *name) {

        static char abuf[MAXDNAME];

        return (res_hostalias(&_res, name, abuf, sizeof abuf));

}

libresolv_hidden_def (hostalias)

#ifdef ultrix

int

local_hostname_length(const char *hostname) {

        int len_host, len_domain;

        if (!*_res.defdname)

                res_init();

        len_host = strlen(hostname);

        len_domain = strlen(_res.defdname);

        if (len_host > len_domain &&

            !strcasecmp(hostname + len_host - len_domain, _res.defdname) &&

            hostname[len_host - len_domain - 1] == '.')

                return (len_host - len_domain - 1);

        return (0);

}

#endif /*ultrix*/

#endif

#include <shlib-compat.h>

#if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2)

# undef res_mkquery

# undef res_query

# undef res_querydomain

# undef res_search

weak_alias (__res_mkquery, res_mkquery);

weak_alias (__res_query, res_query);

weak_alias (__res_querydomain, res_querydomain);

weak_alias (__res_search, res_search);

#endif