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
736
resolv/gethnamaddr.c
Normal file
736
resolv/gethnamaddr.c
Normal file
@ -0,0 +1,736 @@
|
||||
/*
|
||||
* ++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[] = "$Id$";
|
||||
#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 <syslog.h>
|
||||
|
||||
#ifndef LOG_AUTH
|
||||
# define LOG_AUTH 0
|
||||
#endif
|
||||
|
||||
#define MULTI_PTRS_ARE_ALIASES 1 /* XXX - experimental */
|
||||
|
||||
#if defined(BSD) && (BSD >= 199103)
|
||||
# include <string.h>
|
||||
#else
|
||||
# include "../conf/portability.h"
|
||||
#endif
|
||||
#if defined(USE_OPTIONS_H)
|
||||
# include <../conf/options.h>
|
||||
#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 struct in_addr host_addr;
|
||||
static FILE *hostf = NULL;
|
||||
static int stayopen = 0;
|
||||
|
||||
#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, qclass, qtype)
|
||||
const querybuf *answer;
|
||||
int anslen;
|
||||
const char *qname;
|
||||
int qclass, 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+1];
|
||||
|
||||
host.h_name = NULL;
|
||||
eom = answer->buf + anslen;
|
||||
/*
|
||||
* 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);
|
||||
}
|
||||
if ((n = dn_expand(answer->buf, eom, cp, bp, buflen)) < 0) {
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
}
|
||||
cp += n + QFIXEDSZ;
|
||||
if (qtype == T_A) {
|
||||
/* 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 */
|
||||
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;
|
||||
#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
|
||||
host.h_addr_list = h_addr_ptrs;
|
||||
#endif
|
||||
haveanswer = 0;
|
||||
had_error = 0;
|
||||
while (ancount-- > 0 && cp < eom && !had_error) {
|
||||
n = dn_expand(answer->buf, eom, cp, bp, buflen);
|
||||
if (n < 0) {
|
||||
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 != qclass) {
|
||||
/* XXX - debug? syslog? */
|
||||
cp += n;
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
|
||||
if (qtype == T_A && type == T_CNAME) {
|
||||
if (ap >= &host_aliases[MAXALIASES-1])
|
||||
continue;
|
||||
n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
|
||||
if (n < 0) {
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
cp += n;
|
||||
if (host.h_name && strcasecmp(host.h_name, bp) != 0) {
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
"gethostby*.getanswer: asked for \"%s\", got CNAME for \"%s\"",
|
||||
host.h_name, bp);
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
|
||||
/* Store alias. */
|
||||
*ap++ = bp;
|
||||
n = strlen(bp) + 1; /* for the \0 */
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
/* Get canonical name. */
|
||||
n = strlen(tbuf) + 1; /* for the \0 */
|
||||
if (n > buflen) {
|
||||
had_error++;
|
||||
continue;
|
||||
}
|
||||
strcpy(bp, tbuf);
|
||||
host.h_name = 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(qclass), p_type(qtype),
|
||||
p_type(type));
|
||||
cp += n;
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
|
||||
switch (type) {
|
||||
case T_PTR:
|
||||
if (strcasecmp(qname, 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) {
|
||||
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 */
|
||||
bp += n;
|
||||
buflen -= n;
|
||||
}
|
||||
break;
|
||||
#else
|
||||
host.h_name = bp;
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
#endif
|
||||
case T_A:
|
||||
if (strcasecmp(host.h_name, bp) != 0) {
|
||||
syslog(LOG_NOTICE|LOG_AUTH,
|
||||
AskedForGot, host.h_name, bp);
|
||||
cp += n;
|
||||
continue; /* XXX - had_error++ ? */
|
||||
}
|
||||
if (haveanswer) {
|
||||
if (n != host.h_length) {
|
||||
cp += n;
|
||||
continue;
|
||||
}
|
||||
} else {
|
||||
register int nn;
|
||||
|
||||
host.h_length = n;
|
||||
host.h_addrtype = (class == C_IN)
|
||||
? AF_INET
|
||||
: AF_UNSPEC;
|
||||
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;
|
||||
cp += n;
|
||||
break;
|
||||
default:
|
||||
dprintf("Impossible condition (type=%d)\n", type);
|
||||
h_errno = NO_RECOVERY;
|
||||
return (NULL);
|
||||
} /*switch*/
|
||||
if (!had_error)
|
||||
haveanswer++;
|
||||
} /*while*/
|
||||
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 &&
|
||||
qclass == C_IN && qtype == T_A)
|
||||
addrsort(h_addr_ptrs, haveanswer);
|
||||
# endif /*RESOLVSORT*/
|
||||
#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
|
||||
/* nothing */
|
||||
#else
|
||||
host.h_addr = h_addr_ptrs[0];
|
||||
#endif /*BSD*/
|
||||
if (!host.h_name) {
|
||||
n = strlen(qname) + 1; /* for the \0 */
|
||||
strcpy(bp, qname);
|
||||
host.h_name = bp;
|
||||
}
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
} else {
|
||||
h_errno = TRY_AGAIN;
|
||||
return (NULL);
|
||||
}
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
gethostbyname(name)
|
||||
const char *name;
|
||||
{
|
||||
querybuf buf;
|
||||
register const char *cp;
|
||||
int n;
|
||||
extern struct hostent *_gethtbyname();
|
||||
|
||||
/*
|
||||
* 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_aton(name, &host_addr)) {
|
||||
h_errno = HOST_NOT_FOUND;
|
||||
return (NULL);
|
||||
}
|
||||
host.h_name = (char *)name;
|
||||
host.h_aliases = host_aliases;
|
||||
host_aliases[0] = NULL;
|
||||
host.h_addrtype = AF_INET;
|
||||
host.h_length = INT32SZ;
|
||||
h_addr_ptrs[0] = (char *)&host_addr;
|
||||
h_addr_ptrs[1] = NULL;
|
||||
#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
|
||||
host.h_addr_list = h_addr_ptrs;
|
||||
#else
|
||||
host.h_addr = h_addr_ptrs[0];
|
||||
#endif
|
||||
h_errno = NETDB_SUCCESS;
|
||||
return (&host);
|
||||
}
|
||||
if (!isdigit(*cp) && *cp != '.')
|
||||
break;
|
||||
}
|
||||
|
||||
if ((n = res_search(name, C_IN, T_A, buf.buf, sizeof(buf))) < 0) {
|
||||
dprintf("res_search failed (%d)\n", n);
|
||||
if (errno == ECONNREFUSED)
|
||||
return (_gethtbyname(name));
|
||||
return (NULL);
|
||||
}
|
||||
return (getanswer(&buf, n, name, C_IN, T_A));
|
||||
}
|
||||
|
||||
struct hostent *
|
||||
gethostbyaddr(addr, len, type)
|
||||
const char *addr;
|
||||
int len, type;
|
||||
{
|
||||
int n;
|
||||
querybuf buf;
|
||||
register struct hostent *hp;
|
||||
char qbuf[MAXDNAME+1];
|
||||
#ifdef SUNSECURITY
|
||||
register struct hostent *rhp;
|
||||
char **haddr;
|
||||
u_long old_options;
|
||||
char hname2[MAXDNAME+1];
|
||||
#endif /*SUNSECURITY*/
|
||||
extern struct hostent *_gethtbyaddr();
|
||||
|
||||
if (type != AF_INET) {
|
||||
errno = EAFNOSUPPORT;
|
||||
h_errno = NETDB_INTERNAL;
|
||||
return (NULL);
|
||||
}
|
||||
(void)sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa",
|
||||
((unsigned)addr[3] & 0xff),
|
||||
((unsigned)addr[2] & 0xff),
|
||||
((unsigned)addr[1] & 0xff),
|
||||
((unsigned)addr[0] & 0xff));
|
||||
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, type));
|
||||
return (NULL);
|
||||
}
|
||||
if (!(hp = getanswer(&buf, n, qbuf, C_IN, T_PTR)))
|
||||
return (NULL); /* h_errno was set by getanswer() */
|
||||
#ifdef SUNSECURITY
|
||||
/*
|
||||
* 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(hp->h_name))) {
|
||||
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 = type;
|
||||
hp->h_length = len;
|
||||
h_addr_ptrs[0] = (char *)&host_addr;
|
||||
h_addr_ptrs[1] = NULL;
|
||||
host_addr = *(struct in_addr *)addr;
|
||||
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;
|
||||
|
||||
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';
|
||||
/* THIS STUFF IS INTERNET SPECIFIC */
|
||||
if (!inet_aton(p, &host_addr))
|
||||
goto again;
|
||||
h_addr_ptrs[0] = (char *)&host_addr;
|
||||
h_addr_ptrs[1] = NULL;
|
||||
#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
|
||||
host.h_addr_list = h_addr_ptrs;
|
||||
#else
|
||||
host.h_addr = h_addr_ptrs[0];
|
||||
#endif
|
||||
host.h_length = INT32SZ;
|
||||
host.h_addrtype = AF_INET;
|
||||
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)
|
||||
char *name;
|
||||
{
|
||||
register struct hostent *p;
|
||||
register char **cp;
|
||||
|
||||
_sethtent(0);
|
||||
while (p = _gethtent()) {
|
||||
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, type)
|
||||
const char *addr;
|
||||
int len, type;
|
||||
{
|
||||
register struct hostent *p;
|
||||
|
||||
_sethtent(0);
|
||||
while (p = _gethtent())
|
||||
if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len))
|
||||
break;
|
||||
_endhtent();
|
||||
return (p);
|
||||
}
|
||||
|
||||
#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, type)
|
||||
const char *addr;
|
||||
int len, type;
|
||||
{
|
||||
return (_gethtbyaddr(addr, len, type));
|
||||
}
|
||||
|
||||
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*/
|
||||
|
||||
#ifdef ultrix
|
||||
/* more icky libc packaging in ultrix */
|
||||
int
|
||||
local_hostname_length(hostname)
|
||||
const char *hostname;
|
||||
{
|
||||
int len_host, len_domain;
|
||||
|
||||
if (!*_res.defdname)
|
||||
res_init();
|
||||
len_host = strlen(hostname);
|
||||
len_domain = strlen(_res.defdname);
|
||||
if (len_host > len_domain &&
|
||||
!strcasecmp(hostname + len_host - len_domain, _res.defdname) &&
|
||||
hostname[len_host - len_domain - 1] == '.')
|
||||
return (len_host - len_domain - 1);
|
||||
return (0);
|
||||
}
|
||||
#endif
|
||||
Reference in New Issue
Block a user