minix/lib/libc/resolv/res_data.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

363 lines
9.2 KiB
C

/* $NetBSD: res_data.c,v 1.14 2009/10/24 05:35:37 christos Exp $ */
/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* 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 ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#ifdef notdef
static const char rcsid[] = "Id: res_data.c,v 1.7 2008/12/11 09:59:00 marka Exp";
#else
__RCSID("$NetBSD: res_data.c,v 1.14 2009/10/24 05:35:37 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "port_before.h"
#include "namespace.h"
#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>
#include <res_update.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "port_after.h"
#include "res_private.h"
#ifdef __weak_alias
__weak_alias(res_init,_res_init)
__weak_alias(res_mkquery,_res_mkquery)
__weak_alias(res_query,_res_query)
__weak_alias(res_search,_res_search)
__weak_alias(res_send,__res_send)
__weak_alias(res_close,__res_close)
/* XXX: these leaked in the old bind8 libc */
__weak_alias(res_querydomain,__res_querydomain)
__weak_alias(res_send_setqhook,__res_send_setqhook)
__weak_alias(res_send_setrhook,__res_send_setrhook)
#if 0
__weak_alias(p_query,__p_query)
__weak_alias(fp_query,__fp_query)
__weak_alias(fp_nquery,__fp_nquery)
__weak_alias(res_isourserver,__res_isourserver)
__weak_alias(res_opt,_res_opt)
__weak_alias(hostalias,__hostalias)
#endif
#endif
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
extern struct __res_state _nres;
/* Proto. */
int res_ourserver_p(const res_state, const struct sockaddr *);
int
res_init(void) {
int rv;
#ifdef COMPAT__RES
/*
* Compatibility with program that were accessing _res directly
* to set options. We keep another struct res that is the same
* size as the original res structure, and then copy fields to
* it so that we achieve the same initialization
*/
extern void *__res_get_old_state(void);
extern void __res_put_old_state(void *);
res_state ores = __res_get_old_state();
if (ores->options != 0)
_nres.options = ores->options;
if (ores->retrans != 0)
_nres.retrans = ores->retrans;
if (ores->retry != 0)
_nres.retry = ores->retry;
#endif
/*
* 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.
*
* _nres.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 (!_nres.retrans)
_nres.retrans = RES_TIMEOUT;
if (!_nres.retry)
_nres.retry = 4;
if (!(_nres.options & RES_INIT))
_nres.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 (!_nres.id)
_nres.id = res_nrandomid(&_nres);
rv = __res_vinit(&_nres, 1);
#ifdef COMPAT__RES
__res_put_old_state(&_nres);
#endif
return rv;
}
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 ((_nres.options & RES_INIT) == 0U && res_init() == -1)
return;
res_pquery(&_nres, 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 ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nmkquery(&_nres, op, dname, class, type,
data, datalen,
newrr_in, buf, buflen));
}
#ifdef _LIBRESOLV
int
res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nmkupdate(&_nres, 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 ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nquery(&_nres, name, class, type, answer, anslen));
}
void
res_send_setqhook(res_send_qhook hook) {
_nres.qhook = hook;
}
void
res_send_setrhook(res_send_rhook hook) {
_nres.rhook = hook;
}
int
res_isourserver(const struct sockaddr_in *inp) {
return (res_ourserver_p(&_nres, (const struct sockaddr *)(const void *)inp));
}
int
res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
/* errno should have been set by res_init() in this case. */
return (-1);
}
return (res_nsend(&_nres, buf, buflen, ans, anssiz));
}
#ifdef _LIBRESOLV
int
res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
u_char *ans, int anssiz)
{
if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
/* errno should have been set by res_init() in this case. */
return (-1);
}
return (res_nsendsigned(&_nres, buf, buflen, key, ans, anssiz));
}
#endif
void
res_close(void) {
res_nclose(&_nres);
}
#ifdef _LIBRESOLV
int
res_update(ns_updrec *rrecp_in) {
if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nupdate(&_nres, 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 ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nsearch(&_nres, 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 ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nquerydomain(&_nres, name, domain,
class, type,
answer, anslen));
}
int
res_opt(int a, u_char *b, int c, int d)
{
return res_nopt(&_nres, a, b, c, d);
}
u_int
res_randomid(void) {
if ((_nres.options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
return (u_int)-1;
}
return (res_nrandomid(&_nres));
}
const char *
hostalias(const char *name) {
static char abuf[MAXDNAME];
return (res_hostalias(&_nres, name, abuf, sizeof abuf));
}
#ifdef ultrix
int
local_hostname_length(const char *hostname) {
int len_host, len_domain;
if (!*_nres.defdname)
res_init();
len_host = strlen(hostname);
len_domain = strlen(_nres.defdname);
if (len_host > len_domain &&
!strcasecmp(hostname + len_host - len_domain, _nres.defdname) &&
hostname[len_host - len_domain - 1] == '.')
return (len_host - len_domain - 1);
return (0);
}
#endif /*ultrix*/
#endif
/*! \file */