616 lines
14 KiB
C
616 lines
14 KiB
C
/* $NetBSD: getnetnamadr.c,v 1.35 2006/10/15 16:14:46 christos Exp $ */
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/* Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
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* Dep. Matematica Universidade de Coimbra, Portugal, Europe
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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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/*
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* Copyright (c) 1983, 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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)getnetbyaddr.c 8.1 (Berkeley) 6/4/93";
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static char sccsid_[] = "from getnetnamadr.c 1.4 (Coimbra) 93/06/03";
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static char rcsid[] = "Id: getnetnamadr.c,v 8.8 1997/06/01 20:34:37 vixie Exp ";
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#else
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__RCSID("$NetBSD: getnetnamadr.c,v 1.35 2006/10/15 16:14:46 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.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 <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <nsswitch.h>
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#include <resolv.h>
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#include <stdarg.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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#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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#ifdef __weak_alias
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__weak_alias(getnetbyaddr,_getnetbyaddr)
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__weak_alias(getnetbyname,_getnetbyname)
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#endif
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extern int _net_stayopen;
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#define BYADDR 0
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#define BYNAME 1
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#define MAXALIASES 35
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#define MAXPACKET (64*1024)
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typedef union {
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HEADER hdr;
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u_char buf[MAXPACKET];
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} querybuf;
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typedef union {
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long al;
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char ac;
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} align;
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#ifdef YP
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static char *__ypdomain;
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static char *__ypcurrent;
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static int __ypcurrentlen;
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#endif
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static struct netent net_entry;
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static char *net_aliases[MAXALIASES];
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static struct netent *getnetanswer(querybuf *, int, int);
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int _files_getnetbyaddr(void *, void *, va_list);
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int _files_getnetbyname(void *, void *, va_list);
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int _dns_getnetbyaddr(void *, void *, va_list);
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int _dns_getnetbyname(void *, void *, va_list);
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#ifdef YP
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int _yp_getnetbyaddr(void *, void *, va_list);
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int _yp_getnetbyname(void *, void *, va_list);
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struct netent *_ypnetent(char *);
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#endif
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static struct netent *
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getnetanswer(querybuf *answer, int anslen, int net_i)
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{
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HEADER *hp;
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u_char *cp;
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int n;
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u_char *eom;
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int type, class, ancount, qdcount, haveanswer, i, nchar;
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char aux1[MAXDNAME], aux2[MAXDNAME], ans[MAXDNAME];
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char *in, *st, *pauxt, *bp, **ap;
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char *paux1 = &aux1[0], *paux2 = &aux2[0], *ep;
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static char netbuf[PACKETSZ];
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_DIAGASSERT(answer != NULL);
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/*
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* find first satisfactory answer
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*
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* answer --> +------------+ ( MESSAGE )
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* | Header |
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* +------------+
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* | Question | the question for the name server
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* +------------+
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* | Answer | RRs answering the question
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* +------------+
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* | Authority | RRs pointing toward an authority
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* | Additional | RRs holding additional information
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* +------------+
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*/
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eom = answer->buf + anslen;
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hp = &answer->hdr;
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ancount = ntohs(hp->ancount); /* #/records in the answer section */
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qdcount = ntohs(hp->qdcount); /* #/entries in the question section */
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bp = netbuf;
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ep = netbuf + sizeof(netbuf);
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cp = answer->buf + HFIXEDSZ;
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if (!qdcount) {
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if (hp->aa)
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h_errno = HOST_NOT_FOUND;
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else
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h_errno = TRY_AGAIN;
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return NULL;
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}
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while (qdcount-- > 0) {
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n = __dn_skipname(cp, eom);
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if (n < 0 || (cp + n + QFIXEDSZ) > eom) {
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h_errno = NO_RECOVERY;
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return(NULL);
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}
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cp += n + QFIXEDSZ;
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}
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ap = net_aliases;
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*ap = NULL;
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net_entry.n_aliases = net_aliases;
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haveanswer = 0;
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while (--ancount >= 0 && cp < eom) {
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n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
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if ((n < 0) || !res_dnok(bp))
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break;
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cp += n;
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ans[0] = '\0';
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(void)strlcpy(ans, bp, sizeof(ans));
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GETSHORT(type, cp);
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GETSHORT(class, cp);
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cp += INT32SZ; /* TTL */
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GETSHORT(n, cp);
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if (class == C_IN && type == T_PTR) {
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n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
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if ((n < 0) || !res_hnok(bp)) {
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cp += n;
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return NULL;
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}
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cp += n;
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*ap++ = bp;
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bp += strlen(bp) + 1;
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net_entry.n_addrtype =
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(class == C_IN) ? AF_INET : AF_UNSPEC;
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haveanswer++;
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}
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}
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if (haveanswer) {
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*ap = NULL;
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switch (net_i) {
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case BYADDR:
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net_entry.n_name = *net_entry.n_aliases;
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net_entry.n_net = 0L;
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break;
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case BYNAME:
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ap = net_entry.n_aliases;
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next_alias:
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in = *ap++;
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if (in == NULL) {
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h_errno = HOST_NOT_FOUND;
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return NULL;
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}
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net_entry.n_name = ans;
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aux2[0] = '\0';
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for (i = 0; i < 4; i++) {
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for (st = in, nchar = 0;
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isdigit((unsigned char)*st);
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st++, nchar++)
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;
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if (*st != '.' || nchar == 0 || nchar > 3)
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goto next_alias;
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if (i != 0)
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nchar++;
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(void)strlcpy(paux1, in, (size_t)nchar);
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paux1[nchar] = '\0';
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pauxt = paux2;
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paux2 = strcat(paux1, paux2);
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paux1 = pauxt;
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in = ++st;
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}
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if (strcasecmp(in, "IN-ADDR.ARPA") != 0)
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goto next_alias;
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net_entry.n_net = inet_network(paux2);
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break;
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}
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net_entry.n_aliases++;
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#if (defined(__sparc__) && defined(_LP64)) || \
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defined(__alpha__) || \
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(defined(__i386__) && defined(_LP64)) || \
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(defined(__sh__) && defined(_LP64))
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net_entry.__n_pad0 = 0;
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#endif
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return &net_entry;
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}
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h_errno = TRY_AGAIN;
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return NULL;
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}
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/*ARGSUSED*/
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int
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_files_getnetbyaddr(void *rv, void *cb_data, va_list ap)
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{
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struct netent *p;
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uint32_t net;
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int type;
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_DIAGASSERT(rv != NULL);
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net = va_arg(ap, uint32_t);
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type = va_arg(ap, int);
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setnetent(_net_stayopen);
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while ((p = getnetent()) != NULL)
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if (p->n_addrtype == type && p->n_net == net)
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break;
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if (!_net_stayopen)
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endnetent();
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*((struct netent **)rv) = p;
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if (p==NULL) {
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h_errno = HOST_NOT_FOUND;
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return NS_NOTFOUND;
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}
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return NS_SUCCESS;
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}
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/*ARGSUSED*/
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int
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_dns_getnetbyaddr(void *rv, void *cb_data, va_list ap)
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{
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unsigned int netbr[4];
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int nn, anslen;
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querybuf *buf;
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char qbuf[MAXDNAME];
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uint32_t net2;
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struct netent *np;
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uint32_t net;
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int type;
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res_state res;
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_DIAGASSERT(rv != NULL);
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net = va_arg(ap, uint32_t);
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type = va_arg(ap, int);
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if (type != AF_INET)
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return NS_UNAVAIL;
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for (nn = 4, net2 = net; net2; net2 >>= 8)
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netbr[--nn] = (unsigned int)(net2 & 0xff);
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switch (nn) {
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default:
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return NS_UNAVAIL;
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case 3: /* Class A */
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snprintf(qbuf, sizeof(qbuf), "0.0.0.%u.in-addr.arpa", netbr[3]);
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break;
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case 2: /* Class B */
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snprintf(qbuf, sizeof(qbuf), "0.0.%u.%u.in-addr.arpa",
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netbr[3], netbr[2]);
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break;
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case 1: /* Class C */
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snprintf(qbuf, sizeof(qbuf), "0.%u.%u.%u.in-addr.arpa",
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netbr[3], netbr[2], netbr[1]);
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break;
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case 0: /* Class D - E */
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snprintf(qbuf, sizeof(qbuf), "%u.%u.%u.%u.in-addr.arpa",
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netbr[3], netbr[2], netbr[1], netbr[0]);
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break;
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}
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buf = malloc(sizeof(*buf));
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if (buf == NULL) {
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h_errno = NETDB_INTERNAL;
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return NS_NOTFOUND;
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}
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res = __res_get_state();
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if (res == NULL)
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return NS_NOTFOUND;
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anslen = res_nquery(res, qbuf, C_IN, T_PTR, buf->buf, sizeof(buf->buf));
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if (anslen < 0) {
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free(buf);
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#ifdef DEBUG
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if (res->options & RES_DEBUG)
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printf("res_query failed\n");
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#endif
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__res_put_state(res);
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return NS_NOTFOUND;
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}
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__res_put_state(res);
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np = getnetanswer(buf, anslen, BYADDR);
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free(buf);
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if (np) {
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/* maybe net should be unsigned? */
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uint32_t u_net = net;
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/* Strip trailing zeros */
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while ((u_net & 0xff) == 0 && u_net != 0)
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u_net >>= 8;
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np->n_net = u_net;
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}
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*((struct netent **)rv) = np;
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if (np == NULL) {
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h_errno = HOST_NOT_FOUND;
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return NS_NOTFOUND;
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}
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return NS_SUCCESS;
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}
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struct netent *
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getnetbyaddr(uint32_t net, int net_type)
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{
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struct netent *np;
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_files_getnetbyaddr, NULL)
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{ NSSRC_DNS, _dns_getnetbyaddr, NULL }, /* force -DHESIOD */
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NS_NIS_CB(_yp_getnetbyaddr, NULL)
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NS_NULL_CB
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};
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np = NULL;
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h_errno = NETDB_INTERNAL;
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if (nsdispatch(&np, dtab, NSDB_NETWORKS, "getnetbyaddr", __nsdefaultsrc,
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net, net_type) != NS_SUCCESS)
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return NULL;
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h_errno = NETDB_SUCCESS;
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return np;
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}
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/*ARGSUSED*/
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int
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_files_getnetbyname(void *rv, void *cb_data, va_list ap)
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{
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struct netent *p;
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char **cp;
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const char *name;
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_DIAGASSERT(rv != NULL);
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name = va_arg(ap, const char *);
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setnetent(_net_stayopen);
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while ((p = getnetent()) != NULL) {
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if (strcasecmp(p->n_name, name) == 0)
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break;
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for (cp = p->n_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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if (!_net_stayopen)
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endnetent();
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*((struct netent **)rv) = p;
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if (p==NULL) {
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h_errno = HOST_NOT_FOUND;
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return NS_NOTFOUND;
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}
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return NS_SUCCESS;
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}
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/*ARGSUSED*/
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int
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_dns_getnetbyname(void *rv, void *cb_data, va_list ap)
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{
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int anslen;
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querybuf *buf;
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char qbuf[MAXDNAME];
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struct netent *np;
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const char *net;
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res_state res;
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_DIAGASSERT(rv != NULL);
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net = va_arg(ap, const char *);
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strlcpy(&qbuf[0], net, sizeof(qbuf));
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buf = malloc(sizeof(*buf));
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if (buf == NULL) {
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h_errno = NETDB_INTERNAL;
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return NS_NOTFOUND;
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}
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res = __res_get_state();
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if (res == NULL) {
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free(buf);
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return NS_NOTFOUND;
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}
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anslen = res_nsearch(res, qbuf, C_IN, T_PTR, buf->buf,
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sizeof(buf->buf));
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if (anslen < 0) {
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free(buf);
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#ifdef DEBUG
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if (res->options & RES_DEBUG)
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printf("res_search failed\n");
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#endif
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__res_put_state(res);
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return NS_NOTFOUND;
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}
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__res_put_state(res);
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np = getnetanswer(buf, anslen, BYNAME);
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free(buf);
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*((struct netent **)rv) = np;
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if (np == NULL) {
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h_errno = HOST_NOT_FOUND;
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return NS_NOTFOUND;
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}
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return NS_SUCCESS;
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}
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struct netent *
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getnetbyname(const char *net)
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{
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struct netent *np;
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_files_getnetbyname, NULL)
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{ NSSRC_DNS, _dns_getnetbyname, NULL }, /* force -DHESIOD */
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NS_NIS_CB(_yp_getnetbyname, NULL)
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NS_NULL_CB
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};
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_DIAGASSERT(net != NULL);
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np = NULL;
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h_errno = NETDB_INTERNAL;
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if (nsdispatch(&np, dtab, NSDB_NETWORKS, "getnetbyname", __nsdefaultsrc,
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net) != NS_SUCCESS)
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return NULL;
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h_errno = NETDB_SUCCESS;
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return np;
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}
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#ifdef YP
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/*ARGSUSED*/
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int
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_yp_getnetbyaddr(void *rv, void *cb_data, va_list ap)
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{
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struct netent *np;
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char qbuf[MAXDNAME];
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unsigned int netbr[4];
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uint32_t net, net2;
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int type, r;
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_DIAGASSERT(rv != NULL);
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net = va_arg(ap, uint32_t);
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type = va_arg(ap, int);
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if (type != AF_INET)
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return NS_UNAVAIL;
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if (!__ypdomain) {
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if (_yp_check(&__ypdomain) == 0)
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return NS_UNAVAIL;
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}
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np = NULL;
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if (__ypcurrent)
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free(__ypcurrent);
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__ypcurrent = NULL;
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for (r = 4, net2 = net; net2; net2 >>= 8)
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netbr[--r] = (unsigned int)(net2 & 0xff);
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switch (r) {
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default:
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return NS_UNAVAIL;
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case 3: /* Class A */
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snprintf(qbuf, sizeof(qbuf), "%u", netbr[3]);
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break;
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case 2: /* Class B */
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snprintf(qbuf, sizeof(qbuf), "%u.%u", netbr[2], netbr[3]);
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break;
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case 1: /* Class C */
|
|
snprintf(qbuf, sizeof(qbuf), "%u.%u.%u", netbr[1], netbr[2],
|
|
netbr[3]);
|
|
break;
|
|
case 0: /* Class D - E */
|
|
snprintf(qbuf, sizeof(qbuf), "%u.%u.%u.%u", netbr[0], netbr[1],
|
|
netbr[2], netbr[3]);
|
|
break;
|
|
}
|
|
r = yp_match(__ypdomain, "networks.byaddr", qbuf, (int)strlen(qbuf),
|
|
&__ypcurrent, &__ypcurrentlen);
|
|
if (r == 0)
|
|
np = _ypnetent(__ypcurrent);
|
|
|
|
*((struct netent **)rv) = np;
|
|
if (np == NULL) {
|
|
h_errno = HOST_NOT_FOUND;
|
|
return NS_NOTFOUND;
|
|
}
|
|
return NS_SUCCESS;
|
|
|
|
}
|
|
|
|
int
|
|
/*ARGSUSED*/
|
|
_yp_getnetbyname(void *rv, void *cb_data, va_list ap)
|
|
{
|
|
struct netent *np;
|
|
const char *name;
|
|
int r;
|
|
|
|
_DIAGASSERT(rv != NULL);
|
|
|
|
name = va_arg(ap, const char *);
|
|
|
|
if (!__ypdomain) {
|
|
if (_yp_check(&__ypdomain) == 0)
|
|
return NS_UNAVAIL;
|
|
}
|
|
np = NULL;
|
|
if (__ypcurrent)
|
|
free(__ypcurrent);
|
|
__ypcurrent = NULL;
|
|
r = yp_match(__ypdomain, "networks.byname", name, (int)strlen(name),
|
|
&__ypcurrent, &__ypcurrentlen);
|
|
if (r == 0)
|
|
np = _ypnetent(__ypcurrent);
|
|
|
|
*((struct netent **)rv) = np;
|
|
if (np == NULL) {
|
|
h_errno = HOST_NOT_FOUND;
|
|
return NS_NOTFOUND;
|
|
}
|
|
return NS_SUCCESS;
|
|
}
|
|
|
|
struct netent *
|
|
_ypnetent(char *line)
|
|
{
|
|
char *cp, *p, **q;
|
|
|
|
_DIAGASSERT(line != NULL);
|
|
|
|
net_entry.n_name = line;
|
|
cp = strpbrk(line, " \t");
|
|
if (cp == NULL)
|
|
return NULL;
|
|
*cp++ = '\0';
|
|
while (*cp == ' ' || *cp == '\t')
|
|
cp++;
|
|
p = strpbrk(cp, " \t");
|
|
if (p != NULL)
|
|
*p++ = '\0';
|
|
net_entry.n_net = inet_network(cp);
|
|
#if (defined(__sparc__) && defined(_LP64)) || \
|
|
defined(__alpha__) || \
|
|
(defined(__i386__) && defined(_LP64)) || \
|
|
(defined(__sh__) && defined(_LP64))
|
|
net_entry.__n_pad0 = 0;
|
|
#endif
|
|
net_entry.n_addrtype = AF_INET;
|
|
q = net_entry.n_aliases = net_aliases;
|
|
if (p != NULL) {
|
|
cp = p;
|
|
while (cp && *cp) {
|
|
if (*cp == ' ' || *cp == '\t') {
|
|
cp++;
|
|
continue;
|
|
}
|
|
if (q < &net_aliases[MAXALIASES - 1])
|
|
*q++ = cp;
|
|
cp = strpbrk(cp, " \t");
|
|
if (cp != NULL)
|
|
*cp++ = '\0';
|
|
}
|
|
}
|
|
*q = NULL;
|
|
|
|
return &net_entry;
|
|
}
|
|
#endif
|