NetBSD/lib/libc/net/getnetnamadr.c

611 lines
14 KiB
C

/* $NetBSD: getnetnamadr.c,v 1.19 2000/01/22 22:19:14 mycroft Exp $ */
/* Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
* Dep. Matematica Universidade de Coimbra, Portugal, Europe
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getnetbyaddr.c 8.1 (Berkeley) 6/4/93";
static char sccsid_[] = "from getnetnamadr.c 1.4 (Coimbra) 93/06/03";
static char rcsid[] = "Id: getnetnamadr.c,v 8.8 1997/06/01 20:34:37 vixie Exp ";
#else
__RCSID("$NetBSD: getnetnamadr.c,v 1.19 2000/01/22 22:19:14 mycroft Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <nsswitch.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#ifdef YP
#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#endif
#ifdef __weak_alias
__weak_alias(getnetbyaddr,_getnetbyaddr)
__weak_alias(getnetbyname,_getnetbyname)
#endif
extern int h_errno;
extern int _net_stayopen;
#define BYADDR 0
#define BYNAME 1
#define MAXALIASES 35
#if PACKETSZ > 1024
#define MAXPACKET PACKETSZ
#else
#define MAXPACKET 1024
#endif
typedef union {
HEADER hdr;
u_char buf[MAXPACKET];
} querybuf;
typedef union {
long al;
char ac;
} align;
#ifdef YP
static char *__ypdomain;
static char *__ypcurrent;
static int __ypcurrentlen;
#endif
static struct netent net_entry;
static char *net_aliases[MAXALIASES];
static struct netent *getnetanswer __P((querybuf *, int, int));
int _files_getnetbyaddr __P((void *, void *, va_list));
int _files_getnetbyname __P((void *, void *, va_list));
int _dns_getnetbyaddr __P((void *, void *, va_list));
int _dns_getnetbyname __P((void *, void *, va_list));
#ifdef YP
int _yp_getnetbyaddr __P((void *, void *, va_list));
int _yp_getnetbyname __P((void *, void *, va_list));
struct netent *_ypnetent __P((char *));
#endif
static struct netent *
getnetanswer(answer, anslen, net_i)
querybuf *answer;
int anslen;
int net_i;
{
HEADER *hp;
u_char *cp;
int n;
u_char *eom;
int type, class, buflen, ancount, qdcount, haveanswer, i, nchar;
char aux1[30], aux2[30], ans[30], *in, *st, *pauxt, *bp, **ap,
*paux1 = &aux1[0], *paux2 = &aux2[0], flag = 0;
static char netbuf[PACKETSZ];
_DIAGASSERT(answer != NULL);
/*
* find first satisfactory answer
*
* answer --> +------------+ ( MESSAGE )
* | Header |
* +------------+
* | Question | the question for the name server
* +------------+
* | Answer | RRs answering the question
* +------------+
* | Authority | RRs pointing toward an authority
* | Additional | RRs holding additional information
* +------------+
*/
eom = answer->buf + anslen;
hp = &answer->hdr;
ancount = ntohs(hp->ancount); /* #/records in the answer section */
qdcount = ntohs(hp->qdcount); /* #/entries in the question section */
bp = netbuf;
buflen = sizeof(netbuf);
cp = answer->buf + HFIXEDSZ;
if (!qdcount) {
if (hp->aa)
h_errno = HOST_NOT_FOUND;
else
h_errno = TRY_AGAIN;
return (NULL);
}
while (qdcount-- > 0)
cp += __dn_skipname(cp, eom) + QFIXEDSZ;
ap = net_aliases;
*ap = NULL;
net_entry.n_aliases = net_aliases;
haveanswer = 0;
while (--ancount >= 0 && cp < eom) {
n = dn_expand(answer->buf, eom, cp, bp, buflen);
if ((n < 0) || !res_dnok(bp))
break;
cp += n;
ans[0] = '\0';
(void)strcpy(&ans[0], bp);
GETSHORT(type, cp);
GETSHORT(class, cp);
cp += INT32SZ; /* TTL */
GETSHORT(n, cp);
if (class == C_IN && type == T_PTR) {
n = dn_expand(answer->buf, eom, cp, bp, buflen);
if ((n < 0) || !res_hnok(bp)) {
cp += n;
return (NULL);
}
cp += n;
*ap++ = bp;
bp += strlen(bp) + 1;
net_entry.n_addrtype =
(class == C_IN) ? AF_INET : AF_UNSPEC;
haveanswer++;
}
}
if (haveanswer) {
*ap = NULL;
switch (net_i) {
case BYADDR:
net_entry.n_name = *net_entry.n_aliases;
net_entry.n_net = 0L;
break;
case BYNAME:
in = *net_entry.n_aliases;
net_entry.n_name = &ans[0];
aux2[0] = '\0';
for (i = 0; i < 4; i++) {
for (st = in, nchar = 0;
*st != '.';
st++, nchar++)
;
if (nchar != 1 || *in != '0' || flag) {
flag = 1;
(void)strncpy(paux1,
(i==0) ? in : in-1,
(size_t)((i==0) ? nchar : nchar+1));
paux1[(i==0) ? nchar : nchar+1] = '\0';
pauxt = paux2;
paux2 = strcat(paux1, paux2);
paux1 = pauxt;
}
in = ++st;
}
net_entry.n_net = inet_network(paux2);
break;
}
net_entry.n_aliases++;
return (&net_entry);
}
h_errno = TRY_AGAIN;
return (NULL);
}
/*ARGSUSED*/
int
_files_getnetbyaddr(rv, cb_data, ap)
void *rv;
void *cb_data;
va_list ap;
{
struct netent *p;
unsigned long net;
int type;
_DIAGASSERT(rv != NULL);
net = va_arg(ap, unsigned long);
type = va_arg(ap, int);
setnetent(_net_stayopen);
while ((p = getnetent()) != NULL)
if (p->n_addrtype == type && p->n_net == net)
break;
if (!_net_stayopen)
endnetent();
*((struct netent **)rv) = p;
if (p==NULL) {
h_errno = HOST_NOT_FOUND;
return NS_NOTFOUND;
}
return NS_SUCCESS;
}
/*ARGSUSED*/
int
_dns_getnetbyaddr(rv, cb_data, ap)
void *rv;
void *cb_data;
va_list ap;
{
unsigned int netbr[4];
int nn, anslen;
querybuf buf;
char qbuf[MAXDNAME];
unsigned long net2;
struct netent *np;
unsigned long net;
int type;
_DIAGASSERT(rv != NULL);
net = va_arg(ap, unsigned long);
type = va_arg(ap, int);
if (type != AF_INET)
return NS_UNAVAIL;
for (nn = 4, net2 = net; net2; net2 >>= 8)
netbr[--nn] = (unsigned int)(net2 & 0xff);
switch (nn) {
default:
return NS_UNAVAIL;
case 3: /* Class A */
sprintf(qbuf, "0.0.0.%u.in-addr.arpa", netbr[3]);
break;
case 2: /* Class B */
sprintf(qbuf, "0.0.%u.%u.in-addr.arpa", netbr[3], netbr[2]);
break;
case 1: /* Class C */
sprintf(qbuf, "0.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2],
netbr[1]);
break;
case 0: /* Class D - E */
sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2],
netbr[1], netbr[0]);
break;
}
anslen = res_query(qbuf, C_IN, T_PTR, (u_char *)(void *)&buf,
sizeof(buf));
if (anslen < 0) {
#ifdef DEBUG
if (_res.options & RES_DEBUG)
printf("res_query failed\n");
#endif
return NS_NOTFOUND;
}
np = getnetanswer(&buf, anslen, BYADDR);
if (np) {
/* maybe net should be unsigned? */
unsigned long u_net = net;
/* Strip trailing zeros */
while ((u_net & 0xff) == 0 && u_net != 0)
u_net >>= 8;
np->n_net = u_net;
}
*((struct netent **)rv) = np;
if (np == NULL) {
h_errno = HOST_NOT_FOUND;
return NS_NOTFOUND;
}
return NS_SUCCESS;
}
struct netent *
getnetbyaddr(net, net_type)
u_long net;
int net_type;
{
struct netent *np;
static const ns_dtab dtab[] = {
NS_FILES_CB(_files_getnetbyaddr, NULL)
{ NSSRC_DNS, _dns_getnetbyaddr, NULL }, /* force -DHESIOD */
NS_NIS_CB(_yp_getnetbyaddr, NULL)
{ 0 }
};
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
h_errno = NETDB_INTERNAL;
return (NULL);
}
np = NULL;
h_errno = NETDB_INTERNAL;
if (nsdispatch(&np, dtab, NSDB_NETWORKS, "getnetbyaddr", __nsdefaultsrc,
net, net_type) != NS_SUCCESS)
return (NULL);
h_errno = NETDB_SUCCESS;
return (np);
}
/*ARGSUSED*/
int
_files_getnetbyname(rv, cb_data, ap)
void *rv;
void *cb_data;
va_list ap;
{
struct netent *p;
char **cp;
const char *name;
_DIAGASSERT(rv != NULL);
name = va_arg(ap, const char *);
setnetent(_net_stayopen);
while ((p = getnetent()) != NULL) {
if (strcasecmp(p->n_name, name) == 0)
break;
for (cp = p->n_aliases; *cp != 0; cp++)
if (strcasecmp(*cp, name) == 0)
goto found;
}
found:
if (!_net_stayopen)
endnetent();
*((struct netent **)rv) = p;
if (p==NULL) {
h_errno = HOST_NOT_FOUND;
return NS_NOTFOUND;
}
return NS_SUCCESS;
}
/*ARGSUSED*/
int
_dns_getnetbyname(rv, cb_data, ap)
void *rv;
void *cb_data;
va_list ap;
{
int anslen;
querybuf buf;
char qbuf[MAXDNAME];
struct netent *np;
const char *net;
_DIAGASSERT(rv != NULL);
net = va_arg(ap, const char *);
strcpy(&qbuf[0], net);
anslen = res_search(qbuf, C_IN, T_PTR, (u_char *)(void *)&buf,
sizeof(buf));
if (anslen < 0) {
#ifdef DEBUG
if (_res.options & RES_DEBUG)
printf("res_query failed\n");
#endif
return NS_NOTFOUND;
}
np = getnetanswer(&buf, anslen, BYNAME);
*((struct netent **)rv) = np;
if (np == NULL) {
h_errno = HOST_NOT_FOUND;
return NS_NOTFOUND;
}
return NS_SUCCESS;
}
struct netent *
getnetbyname(net)
const char *net;
{
struct netent *np;
static const ns_dtab dtab[] = {
NS_FILES_CB(_files_getnetbyname, NULL)
{ NSSRC_DNS, _dns_getnetbyname, NULL }, /* force -DHESIOD */
NS_NIS_CB(_yp_getnetbyname, NULL)
{ 0 }
};
_DIAGASSERT(net != NULL);
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
h_errno = NETDB_INTERNAL;
return (NULL);
}
np = NULL;
h_errno = NETDB_INTERNAL;
if (nsdispatch(&np, dtab, NSDB_NETWORKS, "getnetbyname", __nsdefaultsrc,
net) != NS_SUCCESS)
return (NULL);
h_errno = NETDB_SUCCESS;
return (np);
}
#ifdef YP
/*ARGSUSED*/
int
_yp_getnetbyaddr(rv, cb_data, ap)
void *rv;
void *cb_data;
va_list ap;
{
struct netent *np;
char qbuf[MAXDNAME];
unsigned int netbr[4];
unsigned long net, net2;
int type, r;
_DIAGASSERT(rv != NULL);
net = va_arg(ap, unsigned long);
type = va_arg(ap, int);
if (type != AF_INET)
return NS_UNAVAIL;
if (!__ypdomain) {
if (_yp_check(&__ypdomain) == 0)
return NS_UNAVAIL;
}
np = NULL;
if (__ypcurrent)
free(__ypcurrent);
__ypcurrent = NULL;
for (r = 4, net2 = net; net2; net2 >>= 8)
netbr[--r] = (unsigned int)(net2 & 0xff);
switch (r) {
default:
return NS_UNAVAIL;
case 3: /* Class A */
sprintf(qbuf, "%u", netbr[0]);
break;
case 2: /* Class B */
sprintf(qbuf, "%u.%u", netbr[0], netbr[1]);
break;
case 1: /* Class C */
sprintf(qbuf, "%u.%u.%u", netbr[0], netbr[1], netbr[2]);
break;
case 0: /* Class D - E */
sprintf(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(rv, cb_data, ap)
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(line)
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);
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