404 lines
9.8 KiB
C
404 lines
9.8 KiB
C
/*
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* Copyright (c) 1985, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Portions Copyright (c) 1996 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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/* from gethostnamadr.c 8.1 (Berkeley) 6/4/93 */
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/* BIND Id: gethnamaddr.c,v 8.15 1996/05/22 04:56:30 vixie Exp $ */
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#if defined(LIBC_SCCS) && !defined(lint)
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static char rcsid[] = "$Id: lcl_ho.c,v 1.15 1997/12/04 04:57:56 halley 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/types.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 <fcntl.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 <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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extern int h_errno;
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/* Definitions. */
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#define MAXALIASES 35
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#define MAXADDRS 35
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#define Max(a,b) ((a) > (b) ? (a) : (b))
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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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FILE * fp;
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struct hostent host;
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char * h_addr_ptrs[MAXADDRS + 1];
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char * host_aliases[MAXALIASES];
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char hostbuf[8*1024];
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u_char host_addr[16]; /* IPv4 or IPv6 */
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};
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typedef union {
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int32_t al;
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char ac;
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} align;
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static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
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static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
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/* Forward. */
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static void ho_close(struct irs_ho *this);
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static struct hostent * ho_byname(struct irs_ho *this, const char *name);
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static struct hostent * ho_byname2(struct irs_ho *this, const char *name,
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int af);
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static struct hostent * ho_byaddr(struct irs_ho *this, const void *addr,
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int len, int af);
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static struct hostent * ho_next(struct irs_ho *this);
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static void ho_rewind(struct irs_ho *this);
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static void ho_minimize(struct irs_ho *this);
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static size_t ns_namelen(const char *);
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/* Portability. */
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#ifndef SEEK_SET
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# define SEEK_SET 0
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#endif
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/* Public. */
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struct irs_ho *
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irs_lcl_ho(struct irs_acc *this) {
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struct irs_ho *ho;
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struct pvt *pvt;
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if (!(pvt = (struct pvt *)malloc(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 (!(ho = malloc(sizeof *ho))) {
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errno = ENOMEM;
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return (NULL);
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}
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memset(ho, 0x5e, sizeof *ho);
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ho->private = pvt;
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ho->close = ho_close;
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ho->byname = ho_byname;
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ho->byname2 = ho_byname2;
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ho->byaddr = ho_byaddr;
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ho->next = ho_next;
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ho->rewind = ho_rewind;
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ho->minimize = ho_minimize;
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return (ho);
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}
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/* Methods. */
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static void
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ho_close(struct irs_ho *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (pvt->fp)
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(void) fclose(pvt->fp);
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free(pvt);
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free(this);
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}
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static struct hostent *
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ho_byname(struct irs_ho *this, const char *name) {
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struct hostent *hp;
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if ((_res.options & RES_INIT) == 0 && res_init() == -1)
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return (NULL);
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if (_res.options & RES_USE_INET6) {
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hp = ho_byname2(this, name, AF_INET6);
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if (hp)
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return (hp);
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}
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return (ho_byname2(this, name, AF_INET));
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}
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static struct hostent *
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ho_byname2(struct irs_ho *this, const char *name, int af) {
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struct hostent *hp;
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char **hap;
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size_t n;
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if ((_res.options & RES_INIT) == 0 && res_init() == -1)
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return (NULL);
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ho_rewind(this);
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n = ns_namelen(name);
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while ((hp = ho_next(this)) != NULL) {
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size_t nn;
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if (hp->h_addrtype != af)
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continue;
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nn = ns_namelen(hp->h_name);
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if (strncasecmp(hp->h_name, name, Max(n, nn)) == 0)
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goto found;
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for (hap = hp->h_aliases; *hap; hap++) {
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nn = ns_namelen(*hap);
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if (strncasecmp(*hap, name, Max(n, nn)) == 0)
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goto found;
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}
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}
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found:
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if (!hp) {
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h_errno = HOST_NOT_FOUND;
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return (NULL);
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}
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h_errno = NETDB_SUCCESS;
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return (hp);
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}
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static struct hostent *
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ho_byaddr(struct irs_ho *this, const void *addr, int len, int af) {
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const u_char *uaddr = addr;
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struct hostent *hp;
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int size;
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if ((_res.options & RES_INIT) == 0 && res_init() == -1)
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return (NULL);
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if (af == AF_INET6 && len == IN6ADDRSZ &&
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(!memcmp(uaddr, mapped, sizeof mapped) ||
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!memcmp(uaddr, tunnelled, sizeof tunnelled))) {
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/* Unmap. */
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addr = (u_char *)addr + sizeof mapped;
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uaddr += sizeof mapped;
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af = AF_INET;
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len = INADDRSZ;
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}
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switch (af) {
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case AF_INET:
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size = INADDRSZ;
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break;
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case AF_INET6:
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size = IN6ADDRSZ;
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break;
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default:
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errno = EAFNOSUPPORT;
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h_errno = NETDB_INTERNAL;
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return (NULL);
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}
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if (size > len) {
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errno = EINVAL;
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h_errno = NETDB_INTERNAL;
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return (NULL);
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}
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/*
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* Do the search.
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*/
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ho_rewind(this);
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while ((hp = ho_next(this)) != NULL) {
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char **hap;
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for (hap = hp->h_addr_list; *hap; hap++) {
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const u_char *taddr = (const u_char *)*hap;
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int taf = hp->h_addrtype;
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int tlen = hp->h_length;
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if (taf == AF_INET6 && tlen == IN6ADDRSZ &&
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(!memcmp(taddr, mapped, sizeof mapped) ||
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!memcmp(taddr, tunnelled, sizeof tunnelled))) {
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/* Unmap. */
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taddr += sizeof mapped;
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taf = AF_INET;
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tlen = INADDRSZ;
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}
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if (taf == af && tlen == len &&
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!memcmp(taddr, uaddr, tlen))
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goto found;
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}
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}
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found:
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if (!hp) {
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h_errno = HOST_NOT_FOUND;
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return (NULL);
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}
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h_errno = NETDB_SUCCESS;
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return (hp);
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}
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static struct hostent *
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ho_next(struct irs_ho *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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char *cp, **q, *p;
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int af, len;
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if (!pvt->fp)
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ho_rewind(this);
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if (!pvt->fp) {
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h_errno = NETDB_INTERNAL;
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return (NULL);
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}
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again:
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if (!(p = fgets(pvt->hostbuf, sizeof pvt->hostbuf, pvt->fp))) {
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h_errno = HOST_NOT_FOUND;
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return (NULL);
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}
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if (*p == '#')
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goto again;
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if (!(cp = strpbrk(p, "#\n")))
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goto again;
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*cp = '\0';
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if (!(cp = strpbrk(p, " \t")))
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goto again;
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*cp++ = '\0';
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if ((_res.options & RES_USE_INET6) &&
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inet_pton(AF_INET6, p, pvt->host_addr) > 0) {
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af = AF_INET6;
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len = IN6ADDRSZ;
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} else if (inet_aton(p, (struct in_addr *)pvt->host_addr) > 0) {
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if (_res.options & RES_USE_INET6) {
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map_v4v6_address((char*)pvt->host_addr,
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(char*)pvt->host_addr);
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af = AF_INET6;
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len = IN6ADDRSZ;
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} else {
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af = AF_INET;
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len = INADDRSZ;
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}
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} else {
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goto again;
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}
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pvt->h_addr_ptrs[0] = (char *)pvt->host_addr;
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pvt->h_addr_ptrs[1] = NULL;
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pvt->host.h_addr_list = pvt->h_addr_ptrs;
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pvt->host.h_length = len;
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pvt->host.h_addrtype = af;
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while (*cp == ' ' || *cp == '\t')
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cp++;
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pvt->host.h_name = cp;
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q = pvt->host.h_aliases = pvt->host_aliases;
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if ((cp = strpbrk(cp, " \t")) != NULL)
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*cp++ = '\0';
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while (cp && *cp) {
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if (*cp == ' ' || *cp == '\t') {
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cp++;
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continue;
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}
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if (q < &pvt->host_aliases[MAXALIASES - 1])
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*q++ = cp;
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if ((cp = strpbrk(cp, " \t")) != NULL)
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*cp++ = '\0';
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}
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*q = NULL;
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h_errno = NETDB_SUCCESS;
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return (&pvt->host);
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}
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static void
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ho_rewind(struct irs_ho *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (pvt->fp) {
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if (fseek(pvt->fp, 0L, SEEK_SET) == 0)
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return;
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(void)fclose(pvt->fp);
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}
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if (!(pvt->fp = fopen(_PATH_HOSTS, "r")))
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return;
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if (fcntl(fileno(pvt->fp), F_SETFD, 1) < 0) {
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(void)fclose(pvt->fp);
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pvt->fp = NULL;
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}
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}
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static void
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ho_minimize(struct irs_ho *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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if (pvt->fp != NULL) {
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(void)fclose(pvt->fp);
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pvt->fp = NULL;
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}
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}
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/* Private. */
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static size_t
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ns_namelen(const char *s) {
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int i;
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for (i = strlen(s); i > 0 && s[i-1] == '.'; i--)
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(void)NULL;
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return ((size_t) i);
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}
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