6b6ac9438f
package does have BXA export approval, but the licensing strings on the dnssafe code are a bit unpleasant. The crypto is easy to restore and bind will run without it - just without full dnssec support. Obtained from: The Internet Software Consortium (www.isc.org)
561 lines
13 KiB
C
561 lines
13 KiB
C
/*
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* Copyright (c) 1996-1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static const char rcsid[] = "$Id: dns_nw.c,v 1.19 1999/10/15 19:49:10 vixie Exp $";
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#endif /* LIBC_SCCS and not lint */
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/* Imports. */
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#include "port_before.h"
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <isc/memcluster.h>
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#include <irs.h>
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#include "port_after.h"
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#include "irs_p.h"
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#include "dns_p.h"
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#ifdef SPRINTF_CHAR
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# define SPRINTF(x) strlen(sprintf/**/x)
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#else
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# define SPRINTF(x) sprintf x
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#endif
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/* Definitions. */
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#define MAXALIASES 35
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#if PACKETSZ > 1024
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#define MAXPACKET PACKETSZ
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#else
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#define MAXPACKET 1024
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#endif
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struct pvt {
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struct nwent net;
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char * ali[MAXALIASES];
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char buf[BUFSIZ+1];
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struct __res_state * res;
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void (*free_res)(void *);
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};
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typedef union {
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long al;
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char ac;
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} align;
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enum by_what { by_addr, by_name };
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/* Forwards. */
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static void nw_close(struct irs_nw *);
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static struct nwent * nw_byname(struct irs_nw *, const char *, int);
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static struct nwent * nw_byaddr(struct irs_nw *, void *, int, int);
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static struct nwent * nw_next(struct irs_nw *);
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static void nw_rewind(struct irs_nw *);
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static void nw_minimize(struct irs_nw *);
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static struct __res_state * nw_res_get(struct irs_nw *this);
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static void nw_res_set(struct irs_nw *this,
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struct __res_state *res,
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void (*free_res)(void *));
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static struct nwent * get1101byaddr(struct irs_nw *, u_char *, int);
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static struct nwent * get1101byname(struct irs_nw *, const char *);
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static struct nwent * get1101answer(struct irs_nw *,
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u_char *ansbuf, int anslen,
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enum by_what by_what,
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int af, const char *name,
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const u_char *addr, int addrlen);
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static struct nwent * get1101mask(struct irs_nw *this, struct nwent *);
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static int make1101inaddr(const u_char *, int, char *, int);
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static void normalize_name(char *name);
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static int init(struct irs_nw *this);
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/* Exports. */
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struct irs_nw *
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irs_dns_nw(struct irs_acc *this) {
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struct irs_nw *nw;
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struct pvt *pvt;
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if (!(pvt = memget(sizeof *pvt))) {
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errno = ENOMEM;
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return (NULL);
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}
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memset(pvt, 0, sizeof *pvt);
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if (!(nw = memget(sizeof *nw))) {
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memput(pvt, sizeof *pvt);
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errno = ENOMEM;
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return (NULL);
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}
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memset(nw, 0x5e, sizeof *nw);
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nw->private = pvt;
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nw->close = nw_close;
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nw->byname = nw_byname;
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nw->byaddr = nw_byaddr;
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nw->next = nw_next;
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nw->rewind = nw_rewind;
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nw->minimize = nw_minimize;
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nw->res_get = nw_res_get;
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nw->res_set = nw_res_set;
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return (nw);
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}
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/* Methods. */
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static void
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nw_close(struct irs_nw *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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nw_minimize(this);
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if (pvt->res && pvt->free_res)
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(*pvt->free_res)(pvt->res);
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memput(pvt, sizeof *pvt);
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memput(this, sizeof *this);
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}
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static struct nwent *
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nw_byname(struct irs_nw *this, const char *name, int af) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (init(this) == -1)
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return (NULL);
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switch (af) {
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case AF_INET:
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return (get1101byname(this, name));
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default:
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(void)NULL;
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}
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RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
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errno = EAFNOSUPPORT;
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return (NULL);
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}
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static struct nwent *
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nw_byaddr(struct irs_nw *this, void *net, int len, int af) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (init(this) == -1)
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return (NULL);
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switch (af) {
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case AF_INET:
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return (get1101byaddr(this, net, len));
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default:
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(void)NULL;
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}
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RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
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errno = EAFNOSUPPORT;
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return (NULL);
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}
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static struct nwent *
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nw_next(struct irs_nw *this) {
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return (NULL);
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}
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static void
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nw_rewind(struct irs_nw *this) {
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/* NOOP */
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}
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static void
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nw_minimize(struct irs_nw *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (pvt->res)
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res_nclose(pvt->res);
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}
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static struct __res_state *
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nw_res_get(struct irs_nw *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (!pvt->res) {
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struct __res_state *res;
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res = (struct __res_state *)malloc(sizeof *res);
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if (!res) {
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errno = ENOMEM;
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return (NULL);
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}
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memset(res, 0, sizeof *res);
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nw_res_set(this, res, free);
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}
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return (pvt->res);
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}
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static void
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nw_res_set(struct irs_nw *this, struct __res_state *res,
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void (*free_res)(void *)) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (pvt->res && pvt->free_res) {
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res_nclose(pvt->res);
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(*pvt->free_res)(pvt->res);
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}
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pvt->res = res;
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pvt->free_res = free_res;
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}
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/* Private. */
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static struct nwent *
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get1101byname(struct irs_nw *this, const char *name) {
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struct pvt *pvt = (struct pvt *)this->private;
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u_char ansbuf[MAXPACKET];
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int anslen;
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anslen = res_nsearch(pvt->res, name, C_IN, T_PTR,
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ansbuf, sizeof ansbuf);
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if (anslen < 0)
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return (NULL);
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return (get1101mask(this, get1101answer(this, ansbuf, anslen, by_name,
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AF_INET, name, NULL, 0)));
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}
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static struct nwent *
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get1101byaddr(struct irs_nw *this, u_char *net, int len) {
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struct pvt *pvt = (struct pvt *)this->private;
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char qbuf[sizeof "255.255.255.255.in-addr.arpa"];
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u_char ansbuf[MAXPACKET];
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int anslen;
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if (len < 1 || len > 32) {
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errno = EINVAL;
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RES_SET_H_ERRNO(pvt->res, NETDB_INTERNAL);
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return (NULL);
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}
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if (make1101inaddr(net, len, qbuf, sizeof qbuf) < 0)
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return (NULL);
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anslen = res_nquery(pvt->res, qbuf, C_IN, T_PTR,
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ansbuf, sizeof ansbuf);
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if (anslen < 0)
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return (NULL);
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return (get1101mask(this, get1101answer(this, ansbuf, anslen, by_addr,
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AF_INET, NULL, net, len)));
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}
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static struct nwent *
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get1101answer(struct irs_nw *this,
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u_char *ansbuf, int anslen, enum by_what by_what,
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int af, const char *name, const u_char *addr, int addrlen)
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{
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struct pvt *pvt = (struct pvt *)this->private;
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int type, class, buflen, ancount, qdcount, haveanswer;
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char *bp, **ap;
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u_char *cp, *eom;
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HEADER *hp;
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/* Initialize, and parse header. */
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eom = ansbuf + anslen;
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if (ansbuf + HFIXEDSZ > eom) {
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RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
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return (NULL);
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}
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hp = (HEADER *)ansbuf;
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cp = ansbuf + HFIXEDSZ;
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qdcount = ntohs(hp->qdcount);
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while (qdcount-- > 0) {
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int n = dn_skipname(cp, eom);
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cp += n + QFIXEDSZ;
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if (n < 0 || cp > eom) {
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RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
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return (NULL);
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}
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}
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ancount = ntohs(hp->ancount);
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if (!ancount) {
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if (hp->aa)
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RES_SET_H_ERRNO(pvt->res, HOST_NOT_FOUND);
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else
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RES_SET_H_ERRNO(pvt->res, TRY_AGAIN);
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return (NULL);
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}
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/* Prepare a return structure. */
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bp = pvt->buf;
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buflen = sizeof pvt->buf;
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pvt->net.n_name = NULL;
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pvt->net.n_aliases = pvt->ali;
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pvt->net.n_addrtype = af;
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pvt->net.n_addr = NULL;
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pvt->net.n_length = addrlen;
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/* Save input key if given. */
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switch (by_what) {
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case by_name:
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if (name != NULL) {
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int n = strlen(name) + 1;
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if (n > buflen) {
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RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
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return (NULL);
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}
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pvt->net.n_name = strcpy(bp, name);
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bp += n;
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buflen -= n;
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}
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break;
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case by_addr:
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if (addr != NULL && addrlen != 0) {
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int n = addrlen / 8 + ((addrlen % 8) != 0);
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if (INADDRSZ > buflen) {
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RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
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return (NULL);
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}
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memset(bp, 0, INADDRSZ);
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memcpy(bp, addr, n);
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pvt->net.n_addr = bp;
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bp += INADDRSZ;
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buflen -= INADDRSZ;
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}
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break;
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default:
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abort();
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}
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/* Parse the answer, collect aliases. */
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ap = pvt->ali;
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haveanswer = 0;
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while (--ancount >= 0 && cp < eom) {
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int n = dn_expand(ansbuf, eom, cp, bp, buflen);
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cp += n; /* Owner */
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if (n < 0 || !maybe_dnok(pvt->res, bp) ||
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cp + 3 * INT16SZ + INT32SZ > eom) {
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RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
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return (NULL);
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}
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GETSHORT(type, cp); /* Type */
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GETSHORT(class, cp); /* Class */
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cp += INT32SZ; /* TTL */
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GETSHORT(n, cp); /* RDLENGTH */
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if (class == C_IN && type == T_PTR) {
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int nn;
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nn = dn_expand(ansbuf, eom, cp, bp, buflen);
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if (nn < 0 || !maybe_hnok(pvt->res, bp) || nn != n) {
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RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
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return (NULL);
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}
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normalize_name(bp);
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switch (by_what) {
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case by_addr: {
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if (pvt->net.n_name == NULL)
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pvt->net.n_name = bp;
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else if (ns_samename(pvt->net.n_name, bp) == 1)
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break;
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else
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*ap++ = bp;
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nn = strlen(bp) + 1;
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bp += nn;
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buflen -= nn;
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haveanswer++;
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break;
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}
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case by_name: {
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u_int b1, b2, b3, b4;
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if (pvt->net.n_addr != NULL ||
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sscanf(bp, "%u.%u.%u.%u.in-addr.arpa",
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&b1, &b2, &b3, &b4) != 4)
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break;
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if (buflen < INADDRSZ) {
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RES_SET_H_ERRNO(pvt->res, NO_RECOVERY);
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return (NULL);
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}
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pvt->net.n_addr = bp;
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*bp++ = b4;
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*bp++ = b3;
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*bp++ = b2;
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*bp++ = b1;
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buflen -= INADDRSZ;
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pvt->net.n_length = INADDRSZ * 8;
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haveanswer++;
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}
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}
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}
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cp += n; /* RDATA */
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}
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if (!haveanswer) {
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RES_SET_H_ERRNO(pvt->res, TRY_AGAIN);
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return (NULL);
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}
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*ap = NULL;
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return (&pvt->net);
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}
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static struct nwent *
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get1101mask(struct irs_nw *this, struct nwent *nwent) {
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struct pvt *pvt = (struct pvt *)this->private;
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char qbuf[sizeof "255.255.255.255.in-addr.arpa"], owner[MAXDNAME];
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int anslen, type, class, ancount, qdcount;
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u_char ansbuf[MAXPACKET], *cp, *eom;
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HEADER *hp;
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if (!nwent)
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return (NULL);
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if (make1101inaddr(nwent->n_addr, nwent->n_length, qbuf, sizeof qbuf)
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< 0) {
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/* "First, do no harm." */
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return (nwent);
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}
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/* Query for the A RR that would hold this network's mask. */
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anslen = res_nquery(pvt->res, qbuf, C_IN, T_A, ansbuf, sizeof ansbuf);
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if (anslen < HFIXEDSZ)
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return (nwent);
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/* Initialize, and parse header. */
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hp = (HEADER *)ansbuf;
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cp = ansbuf + HFIXEDSZ;
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eom = ansbuf + anslen;
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qdcount = ntohs(hp->qdcount);
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while (qdcount-- > 0) {
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int n = dn_skipname(cp, eom);
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cp += n + QFIXEDSZ;
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if (n < 0 || cp > eom)
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return (nwent);
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}
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ancount = ntohs(hp->ancount);
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/* Parse the answer, collect aliases. */
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while (--ancount >= 0 && cp < eom) {
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int n = dn_expand(ansbuf, eom, cp, owner, sizeof owner);
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if (n < 0 || !maybe_dnok(pvt->res, owner))
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break;
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cp += n; /* Owner */
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if (cp + 3 * INT16SZ + INT32SZ > eom)
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break;
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GETSHORT(type, cp); /* Type */
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GETSHORT(class, cp); /* Class */
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cp += INT32SZ; /* TTL */
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GETSHORT(n, cp); /* RDLENGTH */
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if (cp + n > eom)
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break;
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if (n == INADDRSZ && class == C_IN && type == T_A &&
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ns_samename(qbuf, owner) == 1) {
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/* This A RR indicates the actual netmask. */
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int nn, mm;
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nwent->n_length = 0;
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for (nn = 0; nn < INADDRSZ; nn++)
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for (mm = 7; mm >= 0; mm--)
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if (cp[nn] & (1 << mm))
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nwent->n_length++;
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else
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break;
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}
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cp += n; /* RDATA */
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}
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return (nwent);
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}
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static int
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make1101inaddr(const u_char *net, int bits, char *name, int size) {
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int n, m;
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/* Zero fill any whole bytes left out of the prefix. */
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for (n = (32 - bits) / 8; n > 0; n--) {
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if (size < (int)(sizeof "0."))
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goto emsgsize;
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m = SPRINTF((name, "0."));
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name += m;
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size -= m;
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}
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/* Format the partial byte, if any, within the prefix. */
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if ((n = bits % 8) != 0) {
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if (size < (int)(sizeof "255."))
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goto emsgsize;
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m = SPRINTF((name, "%u.",
|
|
net[bits / 8] & ~((1 << (8 - n)) - 1)));
|
|
name += m;
|
|
size -= m;
|
|
}
|
|
|
|
/* Format the whole bytes within the prefix. */
|
|
for (n = bits / 8; n > 0; n--) {
|
|
if (size < (int)(sizeof "255."))
|
|
goto emsgsize;
|
|
m = SPRINTF((name, "%u.", net[n - 1]));
|
|
name += m;
|
|
size -= m;
|
|
}
|
|
|
|
/* Add the static text. */
|
|
if (size < (int)(sizeof "in-addr.arpa"))
|
|
goto emsgsize;
|
|
(void) SPRINTF((name, "in-addr.arpa"));
|
|
return (0);
|
|
|
|
emsgsize:
|
|
errno = EMSGSIZE;
|
|
return (-1);
|
|
}
|
|
|
|
static void
|
|
normalize_name(char *name) {
|
|
char *t;
|
|
|
|
/* Make lower case. */
|
|
for (t = name; *t; t++)
|
|
if (isascii(*t) && isupper(*t))
|
|
*t = tolower(*t);
|
|
|
|
/* Remove trailing dots. */
|
|
while (t > name && t[-1] == '.')
|
|
*--t = '\0';
|
|
}
|
|
|
|
static int
|
|
init(struct irs_nw *this) {
|
|
struct pvt *pvt = (struct pvt *)this->private;
|
|
|
|
if (!pvt->res && !nw_res_get(this))
|
|
return (-1);
|
|
if (((pvt->res->options & RES_INIT) == 0) &&
|
|
res_ninit(pvt->res) == -1)
|
|
return (-1);
|
|
return (0);
|
|
}
|