286 lines
7.8 KiB
C
286 lines
7.8 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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* 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.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 <netdb.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdarg.h>
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#include <nsswitch.h>
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#include <arpa/nameser.h> /* XXX */
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#include <resolv.h> /* XXX */
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#include <dirent.h>
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#include <stdlib.h>
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#include <errno.h>
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static FILE *hostf = NULL;
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static int stayopen = 0;
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__LOCK_INIT(static, host_lock);
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void
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_sethosthtent_r(int f, FILE **hostfile, int *hstayopen)
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{
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if (!*hostfile)
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*hostfile = fopen(_PATH_HOSTS, "r" );
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else
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rewind(*hostfile);
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*hstayopen = f;
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}
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void
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_endhosthtent_r(FILE **hostfile, int *hstayopen)
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{
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if (*hostfile && !*hstayopen) {
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(void) fclose(*hostfile);
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*hostfile = NULL;
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}
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}
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void
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_sethosthtent(f)
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int f;
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{
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_sethosthtent_r(f, &hostf, &stayopen);
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}
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void
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_endhosthtent()
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{
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_endhosthtent_r(&hostf, &stayopen);
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}
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struct hostent *
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gethostent()
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{
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static struct hostent hp;
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static char buffer[BUFSIZ+1];
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static int len = BUFSIZ;
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static int herr;
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#ifdef HAVE_DD_LOCK
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__lock_acquire(host_lock);
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#endif
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gethostent_r(&hp, buffer, len, &herr, &hostf);
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#ifdef HAVE_DD_LOCK
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__lock_release(host_lock);
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#endif
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return &hp;
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}
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int
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gethostent_r(struct hostent *hp, char *buffer, int buflen, int *herr, FILE **hostfile)
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{
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char *p;
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char *cp, **q;
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int af, len;
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if (!*hostfile && !(*hostfile = fopen(_PATH_HOSTS, "r" ))) {
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*herr = NETDB_INTERNAL;
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return -1;
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}
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again:
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if (!(p = fgets(buffer, buflen, *hostfile))) {
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*herr = HOST_NOT_FOUND;
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return -1;
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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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hp->h_addr_list = hp->__host_addrs;
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hp->__host_addrs[0] = (char *)hp->__host_addr;
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if (inet_pton(AF_INET6, p, hp->h_addr_list[0]) > 0) {
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af = AF_INET6;
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len = IN6ADDRSZ;
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} else if (inet_pton(AF_INET, p, hp->h_addr_list[0]) > 0) {
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if (_res.options & RES_USE_INET6) {
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_map_v4v6_address(hp->h_addr_list[0], hp->h_addr_list[0]);
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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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hp->h_addr_list[1] = NULL;
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hp->h_addr = hp->__host_addrs[0];
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hp->h_length = len;
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hp->h_addrtype = af;
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while (*cp == ' ' || *cp == '\t')
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cp++;
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hp->h_name = cp;
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q = hp->h_aliases = hp->__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 < &hp->h_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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*herr = NETDB_SUCCESS;
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return 0;
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}
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int
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_ht_gethostbyname(void *rval, void *cb_data, va_list ap)
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{
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char **cp;
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const char *name;
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int af;
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struct hostent *resultbuf;
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char *buf;
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int buflen;
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int *herr;
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FILE *hostfile = NULL;
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int stayopen;
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int p;
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name = va_arg(ap, const char *);
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af = va_arg(ap, int);
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resultbuf = va_arg(ap, struct hostent *);
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buf = va_arg(ap, char *);
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buflen = va_arg(ap, int);
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herr = va_arg(ap, int *);
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sethostent_r(0, &hostfile, &stayopen);
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while ((p = gethostent_r(resultbuf, buf, buflen, herr, &hostfile)) != -1) {
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if (resultbuf->h_addrtype != af)
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continue;
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if (strcasecmp(resultbuf->h_name, name) == 0)
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break;
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for (cp = resultbuf->h_aliases; *cp != 0; cp++)
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if (strcasecmp(*cp, name) == 0)
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goto found;
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}
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found:
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endhostent_r(&hostfile, &stayopen);
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if (p == -1)
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{
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*(struct hostent **)rval = NULL;
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return NS_NOTFOUND;
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}
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else
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{
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*(struct hostent **)rval = resultbuf;
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return NS_SUCCESS;
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}
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}
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int
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_ht_gethostbyaddr(void *rval, void *cb_data, va_list ap)
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{
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const char *addr;
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int len, af;
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struct hostent *resultbuf;
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char *buf;
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int buflen;
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int *herr;
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FILE *hostfile = NULL;
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int stayopen;
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int p;
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addr = va_arg(ap, const char *);
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len = va_arg(ap, int);
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af = va_arg(ap, int);
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resultbuf = va_arg(ap, struct hostent *);
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buf = va_arg(ap, char *);
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buflen = va_arg(ap, int);
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herr = va_arg(ap, int *);
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sethostent_r(0, &hostfile, &stayopen);
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while ((p = gethostent_r(resultbuf, buf, buflen, herr, &hostfile)) != -1)
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if (resultbuf->h_addrtype == af && !memcmp(resultbuf->h_addr, addr, len))
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break;
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endhostent_r(&hostfile, &stayopen);
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if (p == -1)
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{
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*(struct hostent **)rval = NULL;
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return NS_NOTFOUND;
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}
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else
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{
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*(struct hostent **)rval = resultbuf;
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return NS_SUCCESS;
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}
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}
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