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332 lines
8.8 KiB
C
332 lines
8.8 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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* 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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__FBSDID("$FreeBSD$");
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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 "netdb_private.h"
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void
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_sethosthtent(int f, struct hostent_data *hed)
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{
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if (!hed->hostf)
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hed->hostf = fopen(_PATH_HOSTS, "r");
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else
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rewind(hed->hostf);
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hed->stayopen = f;
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}
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void
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_endhosthtent(struct hostent_data *hed)
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{
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if (hed->hostf && !hed->stayopen) {
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(void) fclose(hed->hostf);
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hed->hostf = NULL;
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}
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}
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static int
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gethostent_p(struct hostent *he, struct hostent_data *hed, int mapped,
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res_state statp)
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{
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char *p, *bp, *ep;
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char *cp, **q;
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int af, len;
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char hostbuf[BUFSIZ + 1];
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if (!hed->hostf && !(hed->hostf = fopen(_PATH_HOSTS, "r"))) {
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RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
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return (-1);
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}
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again:
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if (!(p = fgets(hostbuf, sizeof hostbuf, hed->hostf))) {
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RES_SET_H_ERRNO(statp, 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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cp = strpbrk(p, "#\n");
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if (cp != NULL)
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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, hed->host_addr) > 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, hed->host_addr) > 0) {
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if (mapped) {
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_map_v4v6_address((char *)hed->host_addr,
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(char *)hed->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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hed->h_addr_ptrs[0] = (char *)hed->host_addr;
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hed->h_addr_ptrs[1] = NULL;
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he->h_addr_list = hed->h_addr_ptrs;
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he->h_length = len;
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he->h_addrtype = af;
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while (*cp == ' ' || *cp == '\t')
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cp++;
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bp = hed->hostbuf;
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ep = hed->hostbuf + sizeof hed->hostbuf;
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he->h_name = bp;
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q = he->h_aliases = hed->host_aliases;
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if ((p = strpbrk(cp, " \t")) != NULL)
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*p++ = '\0';
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len = strlen(cp) + 1;
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if (ep - bp < len) {
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RES_SET_H_ERRNO(statp, NO_RECOVERY);
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return (-1);
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}
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strlcpy(bp, cp, ep - bp);
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bp += len;
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cp = p;
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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 >= &hed->host_aliases[_MAXALIASES - 1])
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break;
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if ((p = strpbrk(cp, " \t")) != NULL)
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*p++ = '\0';
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len = strlen(cp) + 1;
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if (ep - bp < len)
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break;
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strlcpy(bp, cp, ep - bp);
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*q++ = bp;
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bp += len;
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cp = p;
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}
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*q = NULL;
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RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
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return (0);
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}
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int
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gethostent_r(struct hostent *hptr, char *buffer, size_t buflen,
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struct hostent **result, int *h_errnop)
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{
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struct hostent_data *hed;
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struct hostent he;
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res_state statp;
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statp = __res_state();
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if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
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RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
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*h_errnop = statp->res_h_errno;
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return (-1);
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}
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if ((hed = __hostent_data_init()) == NULL) {
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RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
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*h_errnop = statp->res_h_errno;
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return (-1);
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}
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if (gethostent_p(&he, hed, statp->options & RES_USE_INET6, statp) != 0)
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return (-1);
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if (__copy_hostent(&he, hptr, buffer, buflen) != 0)
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return (-1);
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*result = hptr;
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return (0);
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}
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struct hostent *
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gethostent(void)
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{
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struct hostdata *hd;
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struct hostent *rval;
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int ret_h_errno;
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if ((hd = __hostdata_init()) == NULL)
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return (NULL);
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if (gethostent_r(&hd->host, hd->data, sizeof(hd->data), &rval,
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&ret_h_errno) != 0)
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return (NULL);
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return (rval);
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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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const char *name;
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int af;
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char *buffer;
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size_t buflen;
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int *errnop, *h_errnop;
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struct hostent *hptr, he;
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struct hostent_data *hed;
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char **cp;
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res_state statp;
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int error;
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name = va_arg(ap, const char *);
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af = va_arg(ap, int);
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hptr = va_arg(ap, struct hostent *);
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buffer = va_arg(ap, char *);
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buflen = va_arg(ap, size_t);
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errnop = va_arg(ap, int *);
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h_errnop = va_arg(ap, int *);
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*((struct hostent **)rval) = NULL;
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statp = __res_state();
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if ((hed = __hostent_data_init()) == NULL) {
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RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
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*h_errnop = statp->res_h_errno;
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return (NS_NOTFOUND);
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}
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_sethosthtent(0, hed);
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while ((error = gethostent_p(&he, hed, 0, statp)) == 0) {
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if (he.h_addrtype != af)
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continue;
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if (he.h_addrtype == AF_INET &&
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statp->options & RES_USE_INET6) {
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_map_v4v6_address(he.h_addr, he.h_addr);
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he.h_length = IN6ADDRSZ;
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he.h_addrtype = AF_INET6;
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}
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if (strcasecmp(he.h_name, name) == 0)
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break;
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for (cp = he.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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_endhosthtent(hed);
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if (error != 0) {
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*h_errnop = statp->res_h_errno;
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return (NS_NOTFOUND);
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}
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if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
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*h_errnop = statp->res_h_errno;
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return (NS_NOTFOUND);
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}
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*((struct hostent **)rval) = hptr;
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return (NS_SUCCESS);
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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 void *addr;
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socklen_t len;
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int af;
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char *buffer;
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size_t buflen;
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int *errnop, *h_errnop;
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struct hostent *hptr, he;
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struct hostent_data *hed;
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res_state statp;
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int error;
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addr = va_arg(ap, const void *);
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len = va_arg(ap, socklen_t);
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af = va_arg(ap, int);
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hptr = va_arg(ap, struct hostent *);
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buffer = va_arg(ap, char *);
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buflen = va_arg(ap, size_t);
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errnop = va_arg(ap, int *);
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h_errnop = va_arg(ap, int *);
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*((struct hostent **)rval) = NULL;
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statp = __res_state();
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if ((hed = __hostent_data_init()) == NULL) {
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RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
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*h_errnop = statp->res_h_errno;
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return (NS_NOTFOUND);
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}
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_sethosthtent(0, hed);
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while ((error = gethostent_p(&he, hed, 0, statp)) == 0)
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if (he.h_addrtype == af && !bcmp(he.h_addr, addr, len)) {
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if (he.h_addrtype == AF_INET &&
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statp->options & RES_USE_INET6) {
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_map_v4v6_address(he.h_addr, he.h_addr);
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he.h_length = IN6ADDRSZ;
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he.h_addrtype = AF_INET6;
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}
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break;
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}
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_endhosthtent(hed);
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if (error != 0)
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return (NS_NOTFOUND);
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if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
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*h_errnop = statp->res_h_errno;
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return (NS_NOTFOUND);
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}
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*((struct hostent **)rval) = hptr;
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return (NS_SUCCESS);
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}
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