bind 4.9.6 resolver files.
This commit is contained in:
mrg
parent
59b1c9add9
commit
d507e9e46d
|
|
@ -0,0 +1,971 @@
|
|||
/*
|
||||
* ++Copyright++ 1985, 1988, 1993
|
||||
* -
|
||||
* Copyright (c) 1985, 1988, 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.
|
||||
* -
|
||||
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
|
||||
*
|
||||
* 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, and that
|
||||
* the name of Digital Equipment Corporation not be used in advertising or
|
||||
* publicity pertaining to distribution of the document or software without
|
||||
* specific, written prior permission.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
|
||||
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
|
||||
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
|
||||
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
|
||||
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
||||
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
|
||||
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
|
||||
* SOFTWARE.
|
||||
* -
|
||||
* --Copyright--
|
||||
*/
|
||||
|
||||
#if defined(LIBC_SCCS) && !defined(lint)
|
||||
static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
|
||||
static char rcsid[] = "$Id: gethnamaddr.c,v 8.21 1997/06/01 20:34:37 vixie Exp ";
|
||||
#endif /* LIBC_SCCS and not lint */
|
||||
|
||||
#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 <stdio.h>
|
||||
#include <netdb.h>
|
||||
#include <resolv.h>
|
||||
#include <ctype.h>
|
||||
#include <errno.h>
|
||||
#include <syslog.h>
|
||||
|
||||
#ifndef LOG_AUTH
|
||||
# define LOG_AUTH 0
|
||||
#endif
|
||||
|
||||
#define MULTI_PTRS_ARE_ALIASES 1 /* XXX - experimental */
|
||||
|
||||
#if defined(BSD) && (BSD >= 199103) && defined(AF_INET6)
|
||||
# include <stdlib.h>
|
||||
# include <string.h>
|
||||
#else
|
||||
# include "../conf/portability.h"
|
||||
#endif
|
||||
|
||||
#if defined(USE_OPTIONS_H)
|
||||
# include <../conf/options.h>
|
||||
#endif
|
||||
|
||||
#ifdef SPRINTF_CHAR
|
||||
# define SPRINTF(x) strlen(sprintf/**/x)
|
||||
#else
|
||||
# define SPRINTF(x) ((size_t)sprintf x)
|
||||
#endif
|
||||
|
||||
#define MAXALIASES 35
|
||||
#define MAXADDRS 35
|
||||
|
||||
static const char AskedForGot[] =
|
||||
"gethostby*.getanswer: asked for \"%s\", got \"%s\"";
|
||||
|
||||
static char *h_addr_ptrs[MAXADDRS + 1];
|
||||
|
||||
static struct hostent host;
|
||||
static char *host_aliases[MAXALIASES];
|
||||
static char hostbuf[8*1024];
|
||||
static u_char host_addr[16]; /* IPv4 or IPv6 */
|
||||
static FILE *hostf = NULL;
|
||||
static int stayopen = 0;
|
||||
|
||||
static void map_v4v6_address __P((const char *src, char *dst));
|
||||
static void map_v4v6_hostent __P((struct hostent *hp, char **bp, int *len));
|
||||
|
||||
#ifdef RESOLVSORT
|
||||
static void addrsort __P((char **, int));
|
||||
#endif
|
||||
|
||||
#if PACKETSZ > 1024
|
||||
#define MAXPACKET PACKETSZ
|
||||
#else
|
||||
#define MAXPACKET 1024
|
||||
#endif
|
||||
|
||||
typedef union {
|
||||
HEADER hdr;
|
||||
u_char buf[MAXPACKET];
|
||||
} querybuf;
|
||||
|
||||
typedef union {
|
||||
int32_t al;
|
||||
char ac;
|
||||
} align;
|
||||
|
||||
extern int h_errno;
|
||||
|
||||
#ifdef DEBUG
|
||||
static void
|
||||
dprintf(msg, num)
|
||||
char *msg;
|
||||
int num;
|
||||
{
|
||||
if (_res.options & RES_DEBUG) {
|
||||
int save = errno;
|
||||
|
||||
printf(msg, num);
|
||||
errno = save;
|
||||
}
|
||||
}
|
||||
#else
|
||||
# define dprintf(msg, num) /*nada*/
|
||||
#endif
|
||||
|
||||
static struct hostent *
|
||||
getanswer(answer, anslen, qname, qtype)
|
||||
const querybuf *answer;
|
||||
int anslen;
|
||||
const char *qname;
|
||||
int qtype;
|
||||
{
|
||||
register const HEADER *hp;
|
||||
register const u_char *cp;
|
||||
register int n;
|
||||
const u_char *eom;
|
||||
char *bp, **ap, **hap;
|
||||
int type, class, buflen, ancount, qdcount;
|
||||
int haveanswer, had_error;
|
||||
int toobig = 0;
|
||||
char tbuf[MAXDNAME];
|
||||
const char *tname;
|
||||
int (*name_ok) __P((const char *));
|
||||
|
||||
tname = qname;
|
||||
host.h_name = NULL;
|
||||
eom = answer->buf + anslen;
|
||||
switch (qtype) {
|
||||
case T_A:
|
||||
case T_AAAA:
|
||||
name_ok = res_hnok;
|
||||
break;
|
||||
case T_PTR:
|
||||
name_ok = res_dnok;
|
||||
break;
|
||||
default:
|
||||
return (NULL); /* XXX should be abort(); */
|
||||
}
|
||||
/*
|
||||
* find first satisfactory answer
|
||||
*/
|
||||
hp = &answer->hdr;
|
||||
ancount = ntohs(hp->ancount);
|
||||
qdcount = ntohs(hp->qdcount);
|
||||
bp = hostbuf;
|
||||
buflen = sizeof hostbuf;
|
||||
cp = answer->buf + HFIXEDSZ;
|
||||
if (qdcount != 1) {
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
}
|
||||
n = dn_expand(answer->buf, eom, cp, bp, buflen);
|
||||
if ((n < 0) || !(*name_ok)(bp)) {
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
}
|
||||
cp += n + QFIXEDSZ;
|
||||
if (qtype == T_A || qtype == T_AAAA) {
|
||||
/* res_send() has already verified that the query name is the
|
||||
* same as the one we sent; this just gets the expanded name
|
||||
* (i.e., with the succeeding search-domain tacked on).
|
||||
*/
|
||||
n = strlen(bp) + 1; /* for the \0 */
|
||||
if (n >= MAXHOSTNAMELEN) {
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
}
|
||||
host.h_name = bp;
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
/* The qname can be abbreviated, but h_name is now absolute. */
|
||||
qname = host.h_name;
|
||||
}
|
||||
ap = host_aliases;
|
||||
*ap = NULL;
|
||||
host.h_aliases = host_aliases;
|
||||
hap = h_addr_ptrs;
|
||||
*hap = NULL;
|
||||
host.h_addr_list = h_addr_ptrs;
|
||||
haveanswer = 0;
|
||||
had_error = 0;
|
||||
while (ancount-- > 0 && cp < eom && !had_error) {
|
||||
n = dn_expand(answer->buf, eom, cp, bp, buflen);
|
||||
if ((n < 0) || !(*name_ok)(bp)) {
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
cp += n; /* name */
|
||||
type = _getshort(cp);
|
||||
cp += INT16SZ; /* type */
|
||||
class = _getshort(cp);
|
||||
cp += INT16SZ + INT32SZ; /* class, TTL */
|
||||
n = _getshort(cp);
|
||||
cp += INT16SZ; /* len */
|
||||
if (class != C_IN) {
|
||||
/* XXX - debug? syslog? */
|
||||
cp += n;
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
|
||||
if ((qtype == T_A || qtype == T_AAAA) && type == T_CNAME) {
|
||||
if (ap >= &host_aliases[MAXALIASES-1])
|
||||
continue;
|
||||
n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
|
||||
if ((n < 0) || !(*name_ok)(tbuf)) {
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
cp += n;
|
||||
/* Store alias. */
|
||||
*ap++ = bp;
|
||||
n = strlen(bp) + 1; /* for the \0 */
|
||||
if (n >= MAXHOSTNAMELEN) {
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
/* Get canonical name. */
|
||||
n = strlen(tbuf) + 1; /* for the \0 */
|
||||
if (n > buflen || n >= MAXHOSTNAMELEN) {
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
strcpy(bp, tbuf);
|
||||
host.h_name = bp;
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
continue;
|
||||
}
|
||||
if (qtype == T_PTR && type == T_CNAME) {
|
||||
n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
|
||||
if (n < 0 || !res_dnok(tbuf)) {
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
cp += n;
|
||||
/* Get canonical name. */
|
||||
n = strlen(tbuf) + 1; /* for the \0 */
|
||||
if (n > buflen || n >= MAXHOSTNAMELEN) {
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
strcpy(bp, tbuf);
|
||||
tname = bp;
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
continue;
|
||||
}
|
||||
if (type != qtype) {
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
"gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
|
||||
qname, p_class(C_IN), p_type(qtype),
|
||||
p_type(type));
|
||||
cp += n;
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
|
||||
switch (type) {
|
||||
case T_PTR:
|
||||
if (strcasecmp(tname, bp) != 0) {
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
AskedForGot, qname, bp);
|
||||
cp += n;
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
|
||||
n = dn_expand(answer->buf, eom, cp, bp, buflen);
|
||||
if ((n < 0) || !res_hnok(bp)) {
|
||||
had_error++;
|
||||
break;
|
||||
}
|
||||
#if MULTI_PTRS_ARE_ALIASES
|
||||
cp += n;
|
||||
if (!haveanswer)
|
||||
host.h_name = bp;
|
||||
else if (ap < &host_aliases[MAXALIASES-1])
|
||||
*ap++ = bp;
|
||||
else
|
||||
n = -1;
|
||||
if (n != -1) {
|
||||
n = strlen(bp) + 1; /* for the \0 */
|
||||
if (n >= MAXHOSTNAMELEN) {
|
||||
had_error++;
|
||||
break;
|
||||
}
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
}
|
||||
break;
|
||||
#else
|
||||
host.h_name = bp;
|
||||
if (_res.options & RES_USE_INET6) {
|
||||
n = strlen(bp) + 1; /* for the \0 */
|
||||
if (n >= MAXHOSTNAMELEN) {
|
||||
had_error++;
|
||||
break;
|
||||
}
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
map_v4v6_hostent(&host, &bp, &buflen);
|
||||
}
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
#endif
|
||||
case T_A:
|
||||
case T_AAAA:
|
||||
if (strcasecmp(host.h_name, bp) != 0) {
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
AskedForGot, host.h_name, bp);
|
||||
cp += n;
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
|
||||
if (n != host.h_length) {
|
||||
cp += n;
|
||||
continue;
|
||||
}
|
||||
if (!haveanswer) {
|
||||
register int nn;
|
||||
|
||||
host.h_name = bp;
|
||||
nn = strlen(bp) + 1; /* for the \0 */
|
||||
bp += nn;
|
||||
buflen -= nn;
|
||||
}
|
||||
|
||||
bp += sizeof(align) - ((u_long)bp % sizeof(align));
|
||||
|
||||
if (bp + n >= &hostbuf[sizeof hostbuf]) {
|
||||
dprintf("size (%d) too big\n", n);
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
if (hap >= &h_addr_ptrs[MAXADDRS-1]) {
|
||||
if (!toobig++)
|
||||
dprintf("Too many addresses (%d)\n",
|
||||
MAXADDRS);
|
||||
cp += n;
|
||||
continue;
|
||||
}
|
||||
bcopy(cp, *hap++ = bp, n);
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
cp += n;
|
||||
break;
|
||||
default:
|
||||
abort();
|
||||
}
|
||||
if (!had_error)
|
||||
haveanswer++;
|
||||
}
|
||||
if (haveanswer) {
|
||||
*ap = NULL;
|
||||
*hap = NULL;
|
||||
# if defined(RESOLVSORT)
|
||||
/*
|
||||
* Note: we sort even if host can take only one address
|
||||
* in its return structures - should give it the "best"
|
||||
* address in that case, not some random one
|
||||
*/
|
||||
if (_res.nsort && haveanswer > 1 && qtype == T_A)
|
||||
addrsort(h_addr_ptrs, haveanswer);
|
||||
# endif /*RESOLVSORT*/
|
||||
if (!host.h_name) {
|
||||
n = strlen(qname) + 1; /* for the \0 */
|
||||
if (n > buflen || n >= MAXHOSTNAMELEN)
|
||||
goto no_recovery;
|
||||
strcpy(bp, qname);
|
||||
host.h_name = bp;
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
}
|
||||
if (_res.options & RES_USE_INET6)
|
||||
map_v4v6_hostent(&host, &bp, &buflen);
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
}
|
||||
no_recovery:
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
gethostbyname(name)
|
||||
const char *name;
|
||||
{
|
||||
struct hostent *hp;
|
||||
|
||||
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
if (_res.options & RES_USE_INET6) {
|
||||
hp = gethostbyname2(name, AF_INET6);
|
||||
if (hp)
|
||||
return (hp);
|
||||
}
|
||||
return (gethostbyname2(name, AF_INET));
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
gethostbyname2(name, af)
|
||||
const char *name;
|
||||
int af;
|
||||
{
|
||||
querybuf buf;
|
||||
register const char *cp;
|
||||
char *bp;
|
||||
int n, size, type, len;
|
||||
extern struct hostent *_gethtbyname2();
|
||||
|
||||
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
switch (af) {
|
||||
case AF_INET:
|
||||
size = INADDRSZ;
|
||||
type = T_A;
|
||||
break;
|
||||
case AF_INET6:
|
||||
size = IN6ADDRSZ;
|
||||
type = T_AAAA;
|
||||
break;
|
||||
default:
|
||||
h_errno = NETDB_INTERNAL;
|
||||
errno = EAFNOSUPPORT;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
host.h_addrtype = af;
|
||||
host.h_length = size;
|
||||
|
||||
/*
|
||||
* if there aren't any dots, it could be a user-level alias.
|
||||
* this is also done in res_query() since we are not the only
|
||||
* function that looks up host names.
|
||||
*/
|
||||
if (!strchr(name, '.') && (cp = __hostalias(name)))
|
||||
name = cp;
|
||||
|
||||
/*
|
||||
* disallow names consisting only of digits/dots, unless
|
||||
* they end in a dot.
|
||||
*/
|
||||
if (isdigit(name[0]))
|
||||
for (cp = name;; ++cp) {
|
||||
if (!*cp) {
|
||||
if (*--cp == '.')
|
||||
break;
|
||||
/*
|
||||
* All-numeric, no dot at the end.
|
||||
* Fake up a hostent as if we'd actually
|
||||
* done a lookup.
|
||||
*/
|
||||
if (inet_pton(af, name, host_addr) <= 0) {
|
||||
h_errno = HOST_NOT_FOUND;
|
||||
return (NULL);
|
||||
}
|
||||
strncpy(hostbuf, name, MAXDNAME);
|
||||
hostbuf[MAXDNAME] = '\0';
|
||||
bp = hostbuf + MAXDNAME;
|
||||
len = sizeof hostbuf - MAXDNAME;
|
||||
host.h_name = hostbuf;
|
||||
host.h_aliases = host_aliases;
|
||||
host_aliases[0] = NULL;
|
||||
h_addr_ptrs[0] = (char *)host_addr;
|
||||
h_addr_ptrs[1] = NULL;
|
||||
host.h_addr_list = h_addr_ptrs;
|
||||
if (_res.options & RES_USE_INET6)
|
||||
map_v4v6_hostent(&host, &bp, &len);
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
}
|
||||
if (!isdigit(*cp) && *cp != '.')
|
||||
break;
|
||||
}
|
||||
if ((isxdigit(name[0]) && strchr(name, ':') != NULL) ||
|
||||
name[0] == ':')
|
||||
for (cp = name;; ++cp) {
|
||||
if (!*cp) {
|
||||
if (*--cp == '.')
|
||||
break;
|
||||
/*
|
||||
* All-IPv6-legal, no dot at the end.
|
||||
* Fake up a hostent as if we'd actually
|
||||
* done a lookup.
|
||||
*/
|
||||
if (inet_pton(af, name, host_addr) <= 0) {
|
||||
h_errno = HOST_NOT_FOUND;
|
||||
return (NULL);
|
||||
}
|
||||
strncpy(hostbuf, name, MAXDNAME);
|
||||
hostbuf[MAXDNAME] = '\0';
|
||||
bp = hostbuf + MAXDNAME;
|
||||
len = sizeof hostbuf - MAXDNAME;
|
||||
host.h_name = hostbuf;
|
||||
host.h_aliases = host_aliases;
|
||||
host_aliases[0] = NULL;
|
||||
h_addr_ptrs[0] = (char *)host_addr;
|
||||
h_addr_ptrs[1] = NULL;
|
||||
host.h_addr_list = h_addr_ptrs;
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
}
|
||||
if (!isxdigit(*cp) && *cp != ':' && *cp != '.')
|
||||
break;
|
||||
}
|
||||
|
||||
if ((n = res_search(name, C_IN, type, buf.buf, sizeof(buf))) < 0) {
|
||||
dprintf("res_search failed (%d)\n", n);
|
||||
if (errno == ECONNREFUSED)
|
||||
return (_gethtbyname2(name, af));
|
||||
return (NULL);
|
||||
}
|
||||
return (getanswer(&buf, n, name, type));
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
gethostbyaddr(addr, len, af)
|
||||
const char *addr; /* XXX should have been def'd as u_char! */
|
||||
int len, af;
|
||||
{
|
||||
const u_char *uaddr = (const u_char *)addr;
|
||||
static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
|
||||
static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
|
||||
int n, size;
|
||||
querybuf buf;
|
||||
register struct hostent *hp;
|
||||
char qbuf[MAXDNAME+1], *qp;
|
||||
#ifdef SUNSECURITY
|
||||
register struct hostent *rhp;
|
||||
char **haddr;
|
||||
u_long old_options;
|
||||
char hname2[MAXDNAME+1];
|
||||
#endif /*SUNSECURITY*/
|
||||
extern struct hostent *_gethtbyaddr();
|
||||
|
||||
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
if (af == AF_INET6 && len == IN6ADDRSZ &&
|
||||
(!bcmp(uaddr, mapped, sizeof mapped) ||
|
||||
!bcmp(uaddr, tunnelled, sizeof tunnelled))) {
|
||||
/* Unmap. */
|
||||
addr += sizeof mapped;
|
||||
uaddr += sizeof mapped;
|
||||
af = AF_INET;
|
||||
len = INADDRSZ;
|
||||
}
|
||||
switch (af) {
|
||||
case AF_INET:
|
||||
size = INADDRSZ;
|
||||
break;
|
||||
case AF_INET6:
|
||||
size = IN6ADDRSZ;
|
||||
break;
|
||||
default:
|
||||
errno = EAFNOSUPPORT;
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
if (size != len) {
|
||||
errno = EINVAL;
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
switch (af) {
|
||||
case AF_INET:
|
||||
(void) sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
|
||||
(uaddr[3] & 0xff),
|
||||
(uaddr[2] & 0xff),
|
||||
(uaddr[1] & 0xff),
|
||||
(uaddr[0] & 0xff));
|
||||
break;
|
||||
case AF_INET6:
|
||||
qp = qbuf;
|
||||
for (n = IN6ADDRSZ - 1; n >= 0; n--) {
|
||||
qp += SPRINTF((qp, "%x.%x.",
|
||||
uaddr[n] & 0xf,
|
||||
(uaddr[n] >> 4) & 0xf));
|
||||
}
|
||||
strcpy(qp, "ip6.int");
|
||||
break;
|
||||
default:
|
||||
abort();
|
||||
}
|
||||
n = res_query(qbuf, C_IN, T_PTR, (u_char *)buf.buf, sizeof buf.buf);
|
||||
if (n < 0) {
|
||||
dprintf("res_query failed (%d)\n", n);
|
||||
if (errno == ECONNREFUSED)
|
||||
return (_gethtbyaddr(addr, len, af));
|
||||
return (NULL);
|
||||
}
|
||||
if (!(hp = getanswer(&buf, n, qbuf, T_PTR)))
|
||||
return (NULL); /* h_errno was set by getanswer() */
|
||||
#ifdef SUNSECURITY
|
||||
if (af == AF_INET) {
|
||||
/*
|
||||
* turn off search as the name should be absolute,
|
||||
* 'localhost' should be matched by defnames
|
||||
*/
|
||||
strncpy(hname2, hp->h_name, MAXDNAME);
|
||||
hname2[MAXDNAME] = '\0';
|
||||
old_options = _res.options;
|
||||
_res.options &= ~RES_DNSRCH;
|
||||
_res.options |= RES_DEFNAMES;
|
||||
if (!(rhp = gethostbyname(hname2))) {
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
"gethostbyaddr: No A record for %s (verifying [%s])",
|
||||
hname2, inet_ntoa(*((struct in_addr *)addr)));
|
||||
_res.options = old_options;
|
||||
h_errno = HOST_NOT_FOUND;
|
||||
return (NULL);
|
||||
}
|
||||
_res.options = old_options;
|
||||
for (haddr = rhp->h_addr_list; *haddr; haddr++)
|
||||
if (!memcmp(*haddr, addr, INADDRSZ))
|
||||
break;
|
||||
if (!*haddr) {
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
"gethostbyaddr: A record of %s != PTR record [%s]",
|
||||
hname2, inet_ntoa(*((struct in_addr *)addr)));
|
||||
h_errno = HOST_NOT_FOUND;
|
||||
return (NULL);
|
||||
}
|
||||
}
|
||||
#endif /*SUNSECURITY*/
|
||||
hp->h_addrtype = af;
|
||||
hp->h_length = len;
|
||||
bcopy(addr, host_addr, len);
|
||||
h_addr_ptrs[0] = (char *)host_addr;
|
||||
h_addr_ptrs[1] = NULL;
|
||||
if (af == AF_INET && (_res.options & RES_USE_INET6)) {
|
||||
map_v4v6_address((char*)host_addr, (char*)host_addr);
|
||||
hp->h_addrtype = AF_INET6;
|
||||
hp->h_length = IN6ADDRSZ;
|
||||
}
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (hp);
|
||||
}
|
||||
|
||||
void
|
||||
_sethtent(f)
|
||||
int f;
|
||||
{
|
||||
if (!hostf)
|
||||
hostf = fopen(_PATH_HOSTS, "r" );
|
||||
else
|
||||
rewind(hostf);
|
||||
stayopen = f;
|
||||
}
|
||||
|
||||
void
|
||||
_endhtent()
|
||||
{
|
||||
if (hostf && !stayopen) {
|
||||
(void) fclose(hostf);
|
||||
hostf = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
_gethtent()
|
||||
{
|
||||
char *p;
|
||||
register char *cp, **q;
|
||||
int af, len;
|
||||
|
||||
if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" ))) {
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
again:
|
||||
if (!(p = fgets(hostbuf, sizeof hostbuf, hostf))) {
|
||||
h_errno = HOST_NOT_FOUND;
|
||||
return (NULL);
|
||||
}
|
||||
if (*p == '#')
|
||||
goto again;
|
||||
if (!(cp = strpbrk(p, "#\n")))
|
||||
goto again;
|
||||
*cp = '\0';
|
||||
if (!(cp = strpbrk(p, " \t")))
|
||||
goto again;
|
||||
*cp++ = '\0';
|
||||
if (inet_pton(AF_INET6, p, host_addr) > 0) {
|
||||
af = AF_INET6;
|
||||
len = IN6ADDRSZ;
|
||||
} else if (inet_pton(AF_INET, p, host_addr) > 0) {
|
||||
if (_res.options & RES_USE_INET6) {
|
||||
map_v4v6_address((char*)host_addr, (char*)host_addr);
|
||||
af = AF_INET6;
|
||||
len = IN6ADDRSZ;
|
||||
} else {
|
||||
af = AF_INET;
|
||||
len = INADDRSZ;
|
||||
}
|
||||
} else {
|
||||
goto again;
|
||||
}
|
||||
h_addr_ptrs[0] = (char *)host_addr;
|
||||
h_addr_ptrs[1] = NULL;
|
||||
host.h_addr_list = h_addr_ptrs;
|
||||
host.h_length = len;
|
||||
host.h_addrtype = af;
|
||||
while (*cp == ' ' || *cp == '\t')
|
||||
cp++;
|
||||
host.h_name = cp;
|
||||
q = host.h_aliases = host_aliases;
|
||||
if (cp = strpbrk(cp, " \t"))
|
||||
*cp++ = '\0';
|
||||
while (cp && *cp) {
|
||||
if (*cp == ' ' || *cp == '\t') {
|
||||
cp++;
|
||||
continue;
|
||||
}
|
||||
if (q < &host_aliases[MAXALIASES - 1])
|
||||
*q++ = cp;
|
||||
if (cp = strpbrk(cp, " \t"))
|
||||
*cp++ = '\0';
|
||||
}
|
||||
*q = NULL;
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
_gethtbyname(name)
|
||||
const char *name;
|
||||
{
|
||||
extern struct hostent *_gethtbyname2();
|
||||
struct hostent *hp;
|
||||
|
||||
if (_res.options & RES_USE_INET6) {
|
||||
hp = _gethtbyname2(name, AF_INET6);
|
||||
if (hp)
|
||||
return (hp);
|
||||
}
|
||||
return (_gethtbyname2(name, AF_INET));
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
_gethtbyname2(name, af)
|
||||
const char *name;
|
||||
int af;
|
||||
{
|
||||
register struct hostent *p;
|
||||
register char **cp;
|
||||
|
||||
_sethtent(0);
|
||||
while (p = _gethtent()) {
|
||||
if (p->h_addrtype != af)
|
||||
continue;
|
||||
if (strcasecmp(p->h_name, name) == 0)
|
||||
break;
|
||||
for (cp = p->h_aliases; *cp != 0; cp++)
|
||||
if (strcasecmp(*cp, name) == 0)
|
||||
goto found;
|
||||
}
|
||||
found:
|
||||
_endhtent();
|
||||
return (p);
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
_gethtbyaddr(addr, len, af)
|
||||
const char *addr;
|
||||
int len, af;
|
||||
{
|
||||
register struct hostent *p;
|
||||
|
||||
_sethtent(0);
|
||||
while (p = _gethtent())
|
||||
if (p->h_addrtype == af && !bcmp(p->h_addr, addr, len))
|
||||
break;
|
||||
_endhtent();
|
||||
return (p);
|
||||
}
|
||||
|
||||
static void
|
||||
map_v4v6_address(src, dst)
|
||||
const char *src;
|
||||
char *dst;
|
||||
{
|
||||
u_char *p = (u_char *)dst;
|
||||
char tmp[INADDRSZ];
|
||||
int i;
|
||||
|
||||
/* Stash a temporary copy so our caller can update in place. */
|
||||
bcopy(src, tmp, INADDRSZ);
|
||||
/* Mark this ipv6 addr as a mapped ipv4. */
|
||||
for (i = 0; i < 10; i++)
|
||||
*p++ = 0x00;
|
||||
*p++ = 0xff;
|
||||
*p++ = 0xff;
|
||||
/* Retrieve the saved copy and we're done. */
|
||||
bcopy(tmp, (void*)p, INADDRSZ);
|
||||
}
|
||||
|
||||
static void
|
||||
map_v4v6_hostent(hp, bpp, lenp)
|
||||
struct hostent *hp;
|
||||
char **bpp;
|
||||
int *lenp;
|
||||
{
|
||||
char **ap;
|
||||
|
||||
if (hp->h_addrtype != AF_INET || hp->h_length != INADDRSZ)
|
||||
return;
|
||||
hp->h_addrtype = AF_INET6;
|
||||
hp->h_length = IN6ADDRSZ;
|
||||
for (ap = hp->h_addr_list; *ap; ap++) {
|
||||
int i = sizeof(align) - ((u_long)*bpp % sizeof(align));
|
||||
|
||||
if (*lenp < (i + IN6ADDRSZ)) {
|
||||
/* Out of memory. Truncate address list here. XXX */
|
||||
*ap = NULL;
|
||||
return;
|
||||
}
|
||||
*bpp += i;
|
||||
*lenp -= i;
|
||||
map_v4v6_address(*ap, *bpp);
|
||||
*ap = *bpp;
|
||||
*bpp += IN6ADDRSZ;
|
||||
*lenp -= IN6ADDRSZ;
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef RESOLVSORT
|
||||
static void
|
||||
addrsort(ap, num)
|
||||
char **ap;
|
||||
int num;
|
||||
{
|
||||
int i, j;
|
||||
char **p;
|
||||
short aval[MAXADDRS];
|
||||
int needsort = 0;
|
||||
|
||||
p = ap;
|
||||
for (i = 0; i < num; i++, p++) {
|
||||
for (j = 0 ; (unsigned)j < _res.nsort; j++)
|
||||
if (_res.sort_list[j].addr.s_addr ==
|
||||
(((struct in_addr *)(*p))->s_addr & _res.sort_list[j].mask))
|
||||
break;
|
||||
aval[i] = j;
|
||||
if (needsort == 0 && i > 0 && j < aval[i-1])
|
||||
needsort = i;
|
||||
}
|
||||
if (!needsort)
|
||||
return;
|
||||
|
||||
while (needsort < num) {
|
||||
for (j = needsort - 1; j >= 0; j--) {
|
||||
if (aval[j] > aval[j+1]) {
|
||||
char *hp;
|
||||
|
||||
i = aval[j];
|
||||
aval[j] = aval[j+1];
|
||||
aval[j+1] = i;
|
||||
|
||||
hp = ap[j];
|
||||
ap[j] = ap[j+1];
|
||||
ap[j+1] = hp;
|
||||
|
||||
} else
|
||||
break;
|
||||
}
|
||||
needsort++;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
#if defined(BSD43_BSD43_NFS) || defined(sun)
|
||||
/* some libc's out there are bound internally to these names (UMIPS) */
|
||||
void
|
||||
ht_sethostent(stayopen)
|
||||
int stayopen;
|
||||
{
|
||||
_sethtent(stayopen);
|
||||
}
|
||||
|
||||
void
|
||||
ht_endhostent()
|
||||
{
|
||||
_endhtent();
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
ht_gethostbyname(name)
|
||||
char *name;
|
||||
{
|
||||
return (_gethtbyname(name));
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
ht_gethostbyaddr(addr, len, af)
|
||||
const char *addr;
|
||||
int len, af;
|
||||
{
|
||||
return (_gethtbyaddr(addr, len, af));
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
gethostent()
|
||||
{
|
||||
return (_gethtent());
|
||||
}
|
||||
|
||||
void
|
||||
dns_service()
|
||||
{
|
||||
return;
|
||||
}
|
||||
|
||||
#undef dn_skipname
|
||||
dn_skipname(comp_dn, eom)
|
||||
const u_char *comp_dn, *eom;
|
||||
{
|
||||
return (__dn_skipname(comp_dn, eom));
|
||||
}
|
||||
#endif /*old-style libc with yp junk in it*/
|
||||
|
|
@ -0,0 +1,288 @@
|
|||
/* 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: getnetnamadr.c,v 8.8 1997/06/01 20:34:37 vixie Exp ";
|
||||
#endif /* LIBC_SCCS and not lint */
|
||||
|
||||
#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 <stdio.h>
|
||||
#include <netdb.h>
|
||||
#include <resolv.h>
|
||||
#include <ctype.h>
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
|
||||
extern int h_errno;
|
||||
|
||||
#if defined(mips) && defined(SYSTYPE_BSD43)
|
||||
extern int errno;
|
||||
#endif
|
||||
|
||||
struct netent *_getnetbyaddr __P((long net, int type));
|
||||
struct netent *_getnetbyname __P((const char *name));
|
||||
|
||||
#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;
|
||||
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[PACKETSZ];
|
||||
|
||||
/*
|
||||
* 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,
|
||||
(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 u_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)
|
||||
register const char *net;
|
||||
{
|
||||
int anslen;
|
||||
querybuf buf;
|
||||
char qbuf[MAXDNAME];
|
||||
struct netent *net_entry;
|
||||
|
||||
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
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));
|
||||
}
|
||||
Loading…
Reference in New Issue