freebsd-dev/lib/libc/resolv/res_data.c
Andriy Voskoboinyk 2cf5e9365d libc: do not include <sys/types.h> where <sys/param.h> was already included
According to style(9):
> normally, include <sys/types.h> OR <sys/param.h>, but not both.
(<sys/param.h> already includes <sys/types.h> when LOCORE is not defined).
2016-04-18 21:05:15 +00:00

336 lines
8.4 KiB
C

/*
* 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$Id: res_data.c,v 1.7 2008/12/11 09:59:00 marka Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "port_before.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"
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
/* Proto. */
int res_ourserver_p(const res_state, const struct sockaddr_in *);
__noinline int
res_init(void) {
extern int __res_vinit(res_state, int);
res_state statp = &_res;
/*
* 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 (!statp->retrans)
statp->retrans = RES_TIMEOUT;
if (!statp->retry)
statp->retry = RES_DFLRETRY;
if (!(statp->options & RES_INIT))
statp->options = RES_DEFAULT;
return (__res_vinit(statp, 1));
}
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) {
res_state statp = &_res;
if ((statp->options & RES_INIT) == 0U && res_init() == -1)
return;
res_pquery(statp, 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 */
{
res_state statp = &_res;
if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
return (-1);
}
return (res_nmkquery(statp, op, dname, class, type,
data, datalen,
newrr_in, buf, buflen));
}
int
res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
res_state statp = &_res;
if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
return (-1);
}
return (res_nmkupdate(statp, rrecp_in, buf, buflen));
}
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 */
{
res_state statp = &_res;
if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
return (-1);
}
return (res_nquery(statp, name, class, type, answer, anslen));
}
#ifndef _LIBC
void
res_send_setqhook(res_send_qhook hook) {
_res.qhook = hook;
}
void
res_send_setrhook(res_send_rhook hook) {
_res.rhook = hook;
}
#endif
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) {
res_state statp = &_res;
if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
/* errno should have been set by res_init() in this case. */
return (-1);
}
return (res_nsend(statp, 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_state statp = &_res;
if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
/* errno should have been set by res_init() in this case. */
return (-1);
}
return (res_nsendsigned(statp, buf, buflen, key, ans, anssiz));
}
#endif
void
res_close(void) {
res_nclose(&_res);
}
int
res_update(ns_updrec *rrecp_in) {
res_state statp = &_res;
if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
return (-1);
}
return (res_nupdate(statp, rrecp_in, NULL));
}
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 */
{
res_state statp = &_res;
if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
return (-1);
}
return (res_nsearch(statp, 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 */
{
res_state statp = &_res;
if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
return (-1);
}
return (res_nquerydomain(statp, name, domain,
class, type,
answer, anslen));
}
u_int
res_randomid(void) {
res_state statp = &_res;
if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
return (-1);
}
return (res_nrandomid(statp));
}
int
res_opt(int n0, u_char *buf, int buflen, int anslen)
{
return (res_nopt(&_res, n0, buf, buflen, 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;
res_state statp;
statp = &_res;
if (!*statp->defdname)
res_init();
len_host = strlen(hostname);
len_domain = strlen(statp->defdname);
if (len_host > len_domain &&
!strcasecmp(hostname + len_host - len_domain, statp->defdname) &&
hostname[len_host - len_domain - 1] == '.')
return (len_host - len_domain - 1);
return (0);
}
#endif /*ultrix*/
/*
* Weak aliases for applications that use certain private entry points,
* and fail to include <resolv.h>.
*/
#undef res_init
__weak_reference(__res_init, res_init);
#undef p_query
__weak_reference(__p_query, p_query);
#undef res_mkquery
__weak_reference(__res_mkquery, res_mkquery);
#undef res_query
__weak_reference(__res_query, res_query);
#undef res_send
__weak_reference(__res_send, res_send);
#undef res_close
__weak_reference(__res_close, _res_close);
#undef res_search
__weak_reference(__res_search, res_search);
#undef res_querydomain
__weak_reference(__res_querydomain, res_querydomain);
#endif
/*! \file */