00b67f09dd
Also known as ISC bind. This import adds utilities such as host(1), dig(1), and nslookup(1), as well as many other tools and libraries. Change-Id: I035ca46e64f1965d57019e773f4ff0ef035e4aa3
295 lines
8.9 KiB
C
295 lines
8.9 KiB
C
/* $NetBSD: getrrset.c,v 1.6 2014/12/10 04:38:02 christos Exp $ */
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/*
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* Copyright (C) 2004, 2005, 2007, 2012, 2014 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 2000-2003 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: getrrset.c,v 1.18 2007/06/19 23:47:22 tbox Exp */
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/*! \file */
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/**
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* DESCRIPTION
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*
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* lwres_getrrsetbyname() gets a set of resource records associated with
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* a hostname, class, and type. hostname is a pointer a to
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* null-terminated string. The flags field is currently unused and must
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* be zero.
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*
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* After a successful call to lwres_getrrsetbyname(), *res is a pointer
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* to an #rrsetinfo structure, containing a list of one or more #rdatainfo
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* structures containing resource records and potentially another list of
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* rdatainfo structures containing SIG resource records associated with
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* those records. The members #rri_rdclass and #rri_rdtype are copied from
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* the parameters. #rri_ttl and #rri_name are properties of the obtained
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* rrset. The resource records contained in #rri_rdatas and #rri_sigs are
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* in uncompressed DNS wire format. Properties of the rdataset are
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* represented in the #rri_flags bitfield. If the #RRSET_VALIDATED bit is
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* set, the data has been DNSSEC validated and the signatures verified.
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*
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* All of the information returned by lwres_getrrsetbyname() is
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* dynamically allocated: the rrsetinfo and rdatainfo structures, and the
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* canonical host name strings pointed to by the rrsetinfostructure.
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* Memory allocated for the dynamically allocated structures created by a
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* successful call to lwres_getrrsetbyname() is released by
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* lwres_freerrset(). rrset is a pointer to a struct rrset created by a
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* call to lwres_getrrsetbyname().
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*
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* The following structures are used:
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*
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* \code
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* struct rdatainfo {
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* unsigned int rdi_length; // length of data
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* unsigned char *rdi_data; // record data
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* };
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*
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* struct rrsetinfo {
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* unsigned int rri_flags; // RRSET_VALIDATED...
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* unsigned int rri_rdclass; // class number
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* unsigned int rri_rdtype; // RR type number
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* unsigned int rri_ttl; // time to live
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* unsigned int rri_nrdatas; // size of rdatas array
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* unsigned int rri_nsigs; // size of sigs array
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* char *rri_name; // canonical name
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* struct rdatainfo *rri_rdatas; // individual records
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* struct rdatainfo *rri_sigs; // individual signatures
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* };
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* \endcode
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*
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* \section getrrset_return Return Values
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*
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* lwres_getrrsetbyname() returns zero on success, and one of the
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* following error codes if an error occurred:
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*
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* \li #ERRSET_NONAME: the name does not exist
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*
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* \li #ERRSET_NODATA:
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* the name exists, but does not have data of the desired type
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*
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* \li #ERRSET_NOMEMORY:
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* memory could not be allocated
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*
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* \li #ERRSET_INVAL:
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* a parameter is invalid
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*
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* \li #ERRSET_FAIL:
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* other failure
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*/
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#include <config.h>
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <lwres/lwres.h>
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#include <lwres/net.h>
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#include <lwres/netdb.h> /* XXX #include <netdb.h> */
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#include "assert_p.h"
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/*!
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* Structure to map results
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*/
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static unsigned int
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lwresult_to_result(lwres_result_t lwresult) {
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switch (lwresult) {
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case LWRES_R_SUCCESS: return (ERRSET_SUCCESS);
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case LWRES_R_NOMEMORY: return (ERRSET_NOMEMORY);
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case LWRES_R_NOTFOUND: return (ERRSET_NONAME);
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case LWRES_R_TYPENOTFOUND: return (ERRSET_NODATA);
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default: return (ERRSET_FAIL);
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}
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}
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/*@{*/
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/*!
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* malloc / calloc functions that guarantee to only
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* return NULL if there is an error, like they used
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* to before the ANSI C committee broke them.
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*/
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static void *
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sane_malloc(size_t size) {
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if (size == 0U)
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size = 1;
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return (malloc(size));
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}
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static void *
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sane_calloc(size_t number, size_t size) {
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size_t len = number * size;
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void *mem = sane_malloc(len);
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if (mem != NULL)
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memset(mem, 0, len);
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return (mem);
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}
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/*@}*/
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/*% Returns a set of resource records associated with a hostname, class, and type. hostname is a pointer a to null-terminated string. */
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int
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lwres_getrrsetbyname(const char *hostname, unsigned int rdclass,
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unsigned int rdtype, unsigned int flags,
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struct rrsetinfo **res)
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{
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lwres_context_t *lwrctx = NULL;
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lwres_result_t lwresult;
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lwres_grbnresponse_t *response = NULL;
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struct rrsetinfo *rrset = NULL;
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unsigned int i;
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unsigned int lwflags;
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unsigned int result;
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if (rdclass > 0xffff || rdtype > 0xffff) {
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result = ERRSET_INVAL;
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goto fail;
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}
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/*
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* Don't allow queries of class or type ANY
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*/
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if (rdclass == 0xff || rdtype == 0xff) {
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result = ERRSET_INVAL;
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goto fail;
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}
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lwresult = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
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if (lwresult != LWRES_R_SUCCESS) {
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result = lwresult_to_result(lwresult);
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goto fail;
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}
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(void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
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/*
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* If any input flags were defined, lwflags would be set here
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* based on them
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*/
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UNUSED(flags);
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lwflags = 0;
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lwresult = lwres_getrdatabyname(lwrctx, hostname,
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(lwres_uint16_t)rdclass,
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(lwres_uint16_t)rdtype,
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lwflags, &response);
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if (lwresult != LWRES_R_SUCCESS) {
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result = lwresult_to_result(lwresult);
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goto fail;
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}
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rrset = sane_malloc(sizeof(struct rrsetinfo));
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if (rrset == NULL) {
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result = ERRSET_NOMEMORY;
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goto fail;
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}
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rrset->rri_name = NULL;
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rrset->rri_rdclass = response->rdclass;
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rrset->rri_rdtype = response->rdtype;
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rrset->rri_ttl = response->ttl;
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rrset->rri_flags = 0;
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rrset->rri_nrdatas = 0;
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rrset->rri_rdatas = NULL;
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rrset->rri_nsigs = 0;
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rrset->rri_sigs = NULL;
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rrset->rri_name = sane_malloc(response->realnamelen + 1);
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if (rrset->rri_name == NULL) {
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result = ERRSET_NOMEMORY;
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goto fail;
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}
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strncpy(rrset->rri_name, response->realname, response->realnamelen);
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rrset->rri_name[response->realnamelen] = 0;
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if ((response->flags & LWRDATA_VALIDATED) != 0)
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rrset->rri_flags |= RRSET_VALIDATED;
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rrset->rri_nrdatas = response->nrdatas;
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rrset->rri_rdatas = sane_calloc(rrset->rri_nrdatas,
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sizeof(struct rdatainfo));
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if (rrset->rri_rdatas == NULL) {
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result = ERRSET_NOMEMORY;
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goto fail;
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}
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for (i = 0; i < rrset->rri_nrdatas; i++) {
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rrset->rri_rdatas[i].rdi_length = response->rdatalen[i];
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rrset->rri_rdatas[i].rdi_data =
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sane_malloc(rrset->rri_rdatas[i].rdi_length);
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if (rrset->rri_rdatas[i].rdi_data == NULL) {
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result = ERRSET_NOMEMORY;
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goto fail;
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}
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memmove(rrset->rri_rdatas[i].rdi_data, response->rdatas[i],
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rrset->rri_rdatas[i].rdi_length);
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}
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rrset->rri_nsigs = response->nsigs;
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rrset->rri_sigs = sane_calloc(rrset->rri_nsigs,
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sizeof(struct rdatainfo));
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if (rrset->rri_sigs == NULL) {
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result = ERRSET_NOMEMORY;
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goto fail;
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}
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for (i = 0; i < rrset->rri_nsigs; i++) {
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rrset->rri_sigs[i].rdi_length = response->siglen[i];
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rrset->rri_sigs[i].rdi_data =
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sane_malloc(rrset->rri_sigs[i].rdi_length);
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if (rrset->rri_sigs[i].rdi_data == NULL) {
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result = ERRSET_NOMEMORY;
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goto fail;
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}
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memmove(rrset->rri_sigs[i].rdi_data, response->sigs[i],
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rrset->rri_sigs[i].rdi_length);
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}
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lwres_grbnresponse_free(lwrctx, &response);
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lwres_conf_clear(lwrctx);
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lwres_context_destroy(&lwrctx);
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*res = rrset;
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return (ERRSET_SUCCESS);
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fail:
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if (rrset != NULL)
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lwres_freerrset(rrset);
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if (response != NULL)
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lwres_grbnresponse_free(lwrctx, &response);
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if (lwrctx != NULL) {
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lwres_conf_clear(lwrctx);
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lwres_context_destroy(&lwrctx);
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}
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return (result);
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}
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/*% Releases memory allocated for the dynamically allocated structures created by a successful call to lwres_getrrsetbyname(). */
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void
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lwres_freerrset(struct rrsetinfo *rrset) {
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unsigned int i;
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if (rrset->rri_rdatas != NULL) {
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for (i = 0; i < rrset->rri_nrdatas; i++) {
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if (rrset->rri_rdatas[i].rdi_data == NULL)
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break;
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free(rrset->rri_rdatas[i].rdi_data);
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}
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free(rrset->rri_rdatas);
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}
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if (rrset->rri_sigs != NULL) {
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for (i = 0; i < rrset->rri_nsigs; i++) {
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if (rrset->rri_sigs[i].rdi_data == NULL)
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break;
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free(rrset->rri_sigs[i].rdi_data);
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}
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free(rrset->rri_sigs);
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}
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free(rrset->rri_name);
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free(rrset);
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}
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