mirror of
https://sourceware.org/git/glibc.git
synced 2025-08-01 10:06:57 +03:00
initial import
This commit is contained in:
Roland McGrath
294
resolv/getnetnamadr.c
Normal file
294
resolv/getnetnamadr.c
Normal file
@ -0,0 +1,294 @@
|
||||
/* 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.
|
||||
*/
|
||||
|
||||
#if defined(LIBC_SCCS) && !defined(lint)
|
||||
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[] = "$Id$";
|
||||
#endif /* LIBC_SCCS and not lint */
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/socket.h>
|
||||
#include <netinet/in.h>
|
||||
#include <arpa/inet.h>
|
||||
#include <arpa/nameser.h>
|
||||
|
||||
#include <stdio.h>
|
||||
#include <netdb.h>
|
||||
#include <resolv.h>
|
||||
#include <ctype.h>
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
#include "conf/portability.h"
|
||||
|
||||
extern int h_errno;
|
||||
|
||||
#if defined(mips) && defined(SYSTYPE_BSD43)
|
||||
extern int errno;
|
||||
#endif
|
||||
|
||||
struct netent *_getnetbyaddr __P((long net, int type));
|
||||
#if defined(sun)
|
||||
struct netent *_getnetbyname __P((char *name));
|
||||
#else
|
||||
struct netent *_getnetbyname __P((const char *name));
|
||||
#endif
|
||||
|
||||
#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;
|
||||
|
||||
static struct netent *
|
||||
getnetanswer(answer, anslen, net_i)
|
||||
querybuf *answer;
|
||||
int anslen;
|
||||
int net_i;
|
||||
{
|
||||
|
||||
register HEADER *hp;
|
||||
register u_char *cp;
|
||||
register int n;
|
||||
u_char *eom;
|
||||
int type, class, buflen, ancount, qdcount, haveanswer, i, nchar,
|
||||
getclass = C_ANY, net_length = 0;
|
||||
char aux1[30], aux2[30], ans[30], *in, *st, *pauxt, *bp, **ap,
|
||||
*paux1 = &aux1[0], *paux2 = &aux2[0], flag = 0;
|
||||
static struct netent net_entry;
|
||||
static char *net_aliases[MAXALIASES], netbuf[BUFSIZ+1];
|
||||
|
||||
/*
|
||||
* 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)
|
||||
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) {
|
||||
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,
|
||||
(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);
|
||||
}
|
||||
|
||||
struct netent *
|
||||
getnetbyaddr(net, net_type)
|
||||
register long net;
|
||||
register int net_type;
|
||||
{
|
||||
unsigned int netbr[4];
|
||||
int nn, anslen;
|
||||
querybuf buf;
|
||||
char qbuf[MAXDNAME];
|
||||
unsigned long net2;
|
||||
struct netent *net_entry;
|
||||
|
||||
if (net_type != AF_INET)
|
||||
return (_getnetbyaddr(net, net_type));
|
||||
|
||||
for (nn = 4, net2 = net; net2; net2 >>= 8)
|
||||
netbr[--nn] = net2 & 0xff;
|
||||
switch (nn) {
|
||||
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 *)&buf, sizeof(buf));
|
||||
if (anslen < 0) {
|
||||
#ifdef DEBUG
|
||||
if (_res.options & RES_DEBUG)
|
||||
printf("res_query failed\n");
|
||||
#endif
|
||||
if (errno == ECONNREFUSED)
|
||||
return (_getnetbyaddr(net, net_type));
|
||||
return (NULL);
|
||||
}
|
||||
net_entry = getnetanswer(&buf, anslen, BYADDR);
|
||||
if (net_entry) {
|
||||
unsigned u_net = net; /* maybe net should be unsigned ? */
|
||||
|
||||
/* Strip trailing zeros */
|
||||
while ((u_net & 0xff) == 0 && u_net != 0)
|
||||
u_net >>= 8;
|
||||
net_entry->n_net = u_net;
|
||||
return (net_entry);
|
||||
}
|
||||
return (_getnetbyaddr(net, net_type));
|
||||
}
|
||||
|
||||
struct netent *
|
||||
getnetbyname(net)
|
||||
#if defined(sun)
|
||||
register char *net;
|
||||
#else
|
||||
register const char *net;
|
||||
#endif
|
||||
{
|
||||
unsigned int netbr[4];
|
||||
int anslen;
|
||||
querybuf buf;
|
||||
char qbuf[MAXDNAME];
|
||||
struct netent *net_entry;
|
||||
|
||||
strcpy(&qbuf[0],net);
|
||||
anslen = res_search(qbuf, C_IN, T_PTR, (u_char *)&buf, sizeof(buf));
|
||||
if (anslen < 0) {
|
||||
#ifdef DEBUG
|
||||
if (_res.options & RES_DEBUG)
|
||||
printf("res_query failed\n");
|
||||
#endif
|
||||
if (errno == ECONNREFUSED)
|
||||
return (_getnetbyname(net));
|
||||
return (_getnetbyname(net));
|
||||
}
|
||||
net_entry = getnetanswer(&buf, anslen, BYNAME);
|
||||
if (net_entry)
|
||||
return (net_entry);
|
||||
return (_getnetbyname(net));
|
||||
}
|
||||
Reference in New Issue
Block a user