+/* Miscellaneous definitions for libresolv.
+ Copyright (C) 1995-2019 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
/*
* Copyright (c) 1995-1999 by Internet Software Consortium.
*
* 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>
-
-#undef _res
-
-const char *_res_opcodes[] = {
- "QUERY",
- "IQUERY",
- "CQUERYM",
- "CQUERYU", /* experimental */
- "NOTIFY", /* experimental */
- "UPDATE",
- "6",
- "7",
- "8",
- "9",
- "10",
- "11",
- "12",
- "13",
- "ZONEINIT",
- "ZONEREF",
-};
-
-#ifdef BIND_UPDATE
-const char *_res_sectioncodes[] = {
- "ZONE",
- "PREREQUISITES",
- "UPDATE",
- "ADDITIONAL",
-};
-#endif
-
-#ifndef __BIND_NOSTATIC
-#ifdef _LIBC
-extern struct __res_state _res;
-#else
-/* The definition has been moved to res_libc.c. */
-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);
-}
-
-void
-fp_nquery(const u_char *msg, int len, FILE *file) {
- if ((_res.options & RES_INIT) == 0 && res_init() == -1)
- return;
-
- res_pquery(&_res, msg, len, file);
-}
-
-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.options & RES_INIT) == 0 && res_init() == -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.options & RES_INIT) == 0 && res_init() == -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.options & RES_INIT) == 0 && res_init() == -1) {
- RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
- return (-1);
- }
- return (res_nquery(&_res, name, class, type, answer, anslen));
-}
+/* This function belongs to libresolv, which is why it is not included
+ in res-close.c. */
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, inp));
-}
-
-int
-res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
- if ((_res.options & RES_INIT) == 0 && res_init() == -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)
+__res_close (void)
{
- if ((_res.options & RES_INIT) == 0 && res_init() == -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.options & RES_INIT) == 0 && res_init() == -1) {
- RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
- return (-1);
- }
-
- return (res_nupdate(&_res, rrecp_in, NULL));
+ /* Some programs call res_close before res_init. Since _res._vcsock
+ isn't explicitly initialized, these means that we could call
+ 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;
+ /* We don't free the name server addresses because we never did it
+ and it would be done implicitly on shutdown. */
+ __res_iclose (&_res, false);
}
-#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.options & RES_INIT) == 0 && res_init() == -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.options & RES_INIT) == 0 && res_init() == -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));
-}
-
-#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
-\f
-
-#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
projects / thirdparty / glibc.git / blobdiff