233 lines
6.5 KiB
C
233 lines
6.5 KiB
C
/* $NetBSD: gethost.c,v 1.12 2013/12/21 20:10:02 christos Exp $ */
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/*-
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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. 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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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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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, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION 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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* --Copyright--
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*/
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/* Provide just /etc/hosts lookup support */
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#include <sys/cdefs.h>
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#ifdef __weak_alias
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#define gethostbyaddr _gethostbyaddr
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#define gethostbyname _gethostbyname
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#endif
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#include <netdb.h>
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#include <string.h>
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#include <nsswitch.h>
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#include <errno.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include "hostent.h"
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#ifdef __weak_alias
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__weak_alias(gethostbyaddr,_gethostbyaddr);
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__weak_alias(gethostbyname,_gethostbyname);
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#endif
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int h_errno;
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FILE *_h_file;
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static struct hostent h_ent;
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static char h_buf[4096];
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static struct hostent *
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getby(int (*f)(void *, void *, va_list), struct getnamaddr *info, ...)
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{
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va_list ap;
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int e;
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va_start(ap, info);
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e = (*f)(info, NULL, ap);
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va_end(ap);
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switch (e) {
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case NS_SUCCESS:
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return info->hp;
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default:
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return NULL;
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}
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}
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struct hostent *
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gethostbyname_r(const char *name, struct hostent *hp, char *buf, size_t bufsiz,
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int *he)
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{
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struct getnamaddr info;
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info.hp = hp;
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info.buf = buf;
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info.buflen = bufsiz;
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info.he = he;
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return getby(_hf_gethtbyname, &info, name, 0, AF_INET);
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}
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struct hostent *
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gethostbyname(const char *name)
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{
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return gethostbyname_r(name, &h_ent, h_buf, sizeof(h_buf), &h_errno);
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}
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struct hostent *
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gethostbyaddr_r(const void *addr, socklen_t len, int type, struct hostent *hp,
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char *buf, size_t bufsiz, int *he)
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{
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struct getnamaddr info;
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info.hp = hp;
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info.buf = buf;
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info.buflen = bufsiz;
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info.he = he;
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return getby(_hf_gethtbyaddr, &info, addr, len, type);
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}
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struct hostent *
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gethostbyaddr(const void *addr, socklen_t len, int type)
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{
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return gethostbyaddr_r(addr, len, type, &h_ent, h_buf, sizeof(h_buf),
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&h_errno);
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}
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struct hostent *
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gethostent_r(FILE *hf, struct hostent *hent, char *buf, size_t buflen, int *he)
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{
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char *p, *name;
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char *cp, **q;
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int af, len;
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size_t llen, anum;
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char *aliases[MAXALIASES];
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struct in6_addr host_addr;
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if (hf == NULL) {
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*he = NETDB_INTERNAL;
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errno = EINVAL;
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return NULL;
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}
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again:
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if ((p = fgetln(hf, &llen)) == NULL) {
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*he = HOST_NOT_FOUND;
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return NULL;
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}
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if (llen < 1)
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goto again;
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if (*p == '#')
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goto again;
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p[llen] = '\0';
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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 (inet_pton(AF_INET6, p, &host_addr) > 0) {
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af = AF_INET6;
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len = NS_IN6ADDRSZ;
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} else if (inet_pton(AF_INET, p, &host_addr) > 0) {
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#if 0
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res_state res = __res_get_state();
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if (res == NULL)
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return NULL;
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if (res->options & RES_USE_INET6) {
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map_v4v6_address(buf, buf);
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af = AF_INET6;
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len = NS_IN6ADDRSZ;
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} else {
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#endif
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af = AF_INET;
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len = NS_INADDRSZ;
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#if 0
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}
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__res_put_state(res);
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#endif
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} else {
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goto again;
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}
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/* if this is not something we're looking for, skip it. */
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if (hent->h_addrtype != 0 && hent->h_addrtype != af)
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goto again;
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if (hent->h_length != 0 && hent->h_length != len)
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goto again;
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while (*cp == ' ' || *cp == '\t')
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cp++;
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if ((cp = strpbrk(name = cp, " \t")) != NULL)
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*cp++ = '\0';
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q = aliases;
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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 >= &aliases[__arraycount(aliases)])
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goto nospc;
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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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hent->h_length = len;
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hent->h_addrtype = af;
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HENT_ARRAY(hent->h_addr_list, 1, buf, buflen);
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anum = (size_t)(q - aliases);
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HENT_ARRAY(hent->h_aliases, anum, buf, buflen);
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HENT_COPY(hent->h_addr_list[0], &host_addr, hent->h_length, buf,
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buflen);
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hent->h_addr_list[1] = NULL;
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HENT_SCOPY(hent->h_name, name, buf, buflen);
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for (size_t i = 0; i < anum; i++)
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HENT_SCOPY(hent->h_aliases[i], aliases[i], buf, buflen);
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hent->h_aliases[anum] = NULL;
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*he = NETDB_SUCCESS;
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return hent;
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nospc:
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errno = ENOSPC;
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*he = NETDB_INTERNAL;
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return NULL;
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}
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