792fd42d78
Since YP protocol definition uses the constant to declare variable-size opaque byte strings, the change should be binary compatible with existing installations which do not expose keys or values larger than 1024 bytes. All uses of local variables with YPMAXRECORD sizes were removed to avoid insane stack use. On the other hand, variables with static lifetime should be fine and only result in increased VA use. Glibc made same change, increasing the allowed length for keys and values in YP to 16M, in 2013. Reviewed by: markj Discussed with: ian Sponsored by: Mellanox Technologies MFC after: 3 weeks Differential revision: https://reviews.freebsd.org/D20900
301 lines
6.9 KiB
C
301 lines
6.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1994, Garrett Wollman
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE 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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#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 <arpa/nameser.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.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 <resolv.h> /* XXX */
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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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#endif
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#include "netdb_private.h"
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#ifdef YP
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static int
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_gethostbynis(const char *name, char *map, int af, struct hostent *he,
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struct hostent_data *hed)
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{
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char *p, *bp, *ep;
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char *cp, **q;
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char *result;
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int resultlen, size, addrok = 0;
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char *ypbuf;
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res_state statp;
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statp = __res_state();
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switch(af) {
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case AF_INET:
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size = NS_INADDRSZ;
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break;
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case AF_INET6:
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size = NS_IN6ADDRSZ;
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break;
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default:
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errno = EAFNOSUPPORT;
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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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if (hed->yp_domain == (char *)NULL)
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if (yp_get_default_domain (&hed->yp_domain)) {
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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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if (yp_match(hed->yp_domain, map, name, strlen(name), &result,
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&resultlen)) {
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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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/* avoid potential memory leak */
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ypbuf = alloca(resultlen + 2);
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bcopy(result, ypbuf, resultlen);
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ypbuf[resultlen] = '\0';
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free(result);
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result = ypbuf;
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if ((cp = strchr(result, '\n')))
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*cp = '\0';
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cp = strpbrk(result, " \t");
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*cp++ = '\0';
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he->h_addr_list = hed->h_addr_ptrs;
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he->h_addr = (char *)hed->host_addr;
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switch (af) {
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case AF_INET:
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addrok = inet_aton(result, (struct in_addr *)hed->host_addr);
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if (addrok != 1)
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break;
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if (statp->options & RES_USE_INET6) {
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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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size = NS_IN6ADDRSZ;
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}
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break;
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case AF_INET6:
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addrok = inet_pton(af, result, hed->host_addr);
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break;
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}
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if (addrok != 1) {
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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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he->h_addr_list[1] = NULL;
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he->h_length = size;
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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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p = strpbrk(cp, " \t");
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if (p != NULL)
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*p++ = '\0';
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size = strlen(cp) + 1;
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if (ep - bp < size) {
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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 += size;
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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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p = strpbrk(cp, " \t");
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if (p != NULL)
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*p++ = '\0';
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size = strlen(cp) + 1;
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if (ep - bp < size)
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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 += size;
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cp = p;
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}
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*q = NULL;
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return (0);
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}
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static int
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_gethostbynisname_r(const char *name, int af, struct hostent *he,
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struct hostent_data *hed)
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{
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char *map;
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switch (af) {
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case AF_INET:
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map = "hosts.byname";
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break;
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default:
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map = "ipnodes.byname";
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break;
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}
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return (_gethostbynis(name, map, af, he, hed));
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}
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static int
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_gethostbynisaddr_r(const void *addr, socklen_t len, int af,
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struct hostent *he, struct hostent_data *hed)
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{
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char *map;
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char numaddr[46];
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switch (af) {
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case AF_INET:
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map = "hosts.byaddr";
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break;
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default:
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map = "ipnodes.byaddr";
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break;
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}
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if (inet_ntop(af, addr, numaddr, sizeof(numaddr)) == NULL)
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return (-1);
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return (_gethostbynis(numaddr, map, af, he, hed));
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}
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#endif /* YP */
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int
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_nis_gethostbyname(void *rval, void *cb_data, va_list ap)
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{
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#ifdef YP
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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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res_state statp;
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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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if (_gethostbynisname_r(name, af, &he, hed) != 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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*errnop = errno;
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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_RETURN);
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}
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*((struct hostent **)rval) = hptr;
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return (NS_SUCCESS);
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#else
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*((struct hostent **)rval) = NULL;
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return (NS_UNAVAIL);
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#endif
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}
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int
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_nis_gethostbyaddr(void *rval, void *cb_data, va_list ap)
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{
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#ifdef YP
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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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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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if (_gethostbynisaddr_r(addr, len, af, &he, hed) != 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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*errnop = errno;
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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_RETURN);
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}
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*((struct hostent **)rval) = hptr;
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return (NS_SUCCESS);
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#else
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*((struct hostent **)rval) = NULL;
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return (NS_UNAVAIL);
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#endif
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}
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