mirror of https://github.com/GnoConsortium/gno.git
428 lines
10 KiB
C
428 lines
10 KiB
C
/*
|
|
* Copyright (c) 1985, 1988 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[] = "@(#)gethostnamadr.c 6.48 (Berkeley) 1/10/93";
|
|
#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 <netdb.h>
|
|
#include <resolv.h>
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
#include "protos.h"
|
|
|
|
#define MAXALIASES 35
|
|
#define MAXADDRS 35
|
|
|
|
static char *h_addr_ptrs[MAXADDRS + 1];
|
|
|
|
static struct hostent host;
|
|
static char *host_aliases[MAXALIASES];
|
|
static char hostbuf[BUFSIZ+1];
|
|
static struct in_addr host_addr;
|
|
static FILE *hostf = NULL;
|
|
static char hostaddr[MAXADDRS];
|
|
static char *host_addrs[2];
|
|
static int stayopen = 0;
|
|
|
|
#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;
|
|
|
|
extern int h_errno;
|
|
|
|
static struct hostent *
|
|
getanswer(querybuf *answer, int anslen, int iquery)
|
|
{
|
|
register HEADER *hp;
|
|
register u_char *cp;
|
|
register int n;
|
|
u_char *eom;
|
|
char *bp, **ap;
|
|
int type, class, buflen, ancount, qdcount;
|
|
int haveanswer, getclass = C_ANY;
|
|
char **hap;
|
|
|
|
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 + sizeof(HEADER);
|
|
if (qdcount) {
|
|
if (iquery) {
|
|
if ((n = dn_expand((u_char *)answer->buf,
|
|
(u_char *)eom, (u_char *)cp, (u_char *)bp,
|
|
buflen)) < 0) {
|
|
h_errno = NO_RECOVERY;
|
|
return ((struct hostent *) NULL);
|
|
}
|
|
cp += n + QFIXEDSZ;
|
|
host.h_name = bp;
|
|
n = strlen(bp) + 1;
|
|
bp += n;
|
|
buflen -= n;
|
|
} else
|
|
cp += __dn_skipname(cp, eom) + QFIXEDSZ;
|
|
while (--qdcount > 0)
|
|
cp += __dn_skipname(cp, eom) + QFIXEDSZ;
|
|
} else if (iquery) {
|
|
if (hp->aa)
|
|
h_errno = HOST_NOT_FOUND;
|
|
else
|
|
h_errno = TRY_AGAIN;
|
|
return ((struct hostent *) NULL);
|
|
}
|
|
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;
|
|
while (--ancount >= 0 && cp < eom) {
|
|
if ((n = dn_expand((u_char *)answer->buf, (u_char *)eom,
|
|
(u_char *)cp, (u_char *)bp, buflen)) < 0)
|
|
break;
|
|
cp += n;
|
|
type = _getshort(cp);
|
|
cp += sizeof(u_short);
|
|
class = _getshort(cp);
|
|
cp += sizeof(u_short) + sizeof(u_long);
|
|
n = _getshort(cp);
|
|
cp += sizeof(u_short);
|
|
if (type == T_CNAME) {
|
|
cp += n;
|
|
if (ap >= &host_aliases[MAXALIASES-1])
|
|
continue;
|
|
*ap++ = bp;
|
|
n = strlen(bp) + 1;
|
|
bp += n;
|
|
buflen -= n;
|
|
continue;
|
|
}
|
|
if (iquery && type == T_PTR) {
|
|
if ((n = dn_expand((u_char *)answer->buf,
|
|
(u_char *)eom, (u_char *)cp, (u_char *)bp,
|
|
buflen)) < 0)
|
|
break;
|
|
cp += n;
|
|
host.h_name = bp;
|
|
return(&host);
|
|
}
|
|
if (iquery || type != T_A) {
|
|
#ifdef DEBUG
|
|
if (_res.options & RES_DEBUG)
|
|
printf("unexpected answer type %d, size %d\n",
|
|
type, n);
|
|
#endif
|
|
cp += n;
|
|
continue;
|
|
}
|
|
if (haveanswer) {
|
|
if (n != host.h_length) {
|
|
cp += n;
|
|
continue;
|
|
}
|
|
if (class != getclass) {
|
|
cp += n;
|
|
continue;
|
|
}
|
|
} else {
|
|
host.h_length = n;
|
|
getclass = class;
|
|
host.h_addrtype = (class == C_IN) ? AF_INET : AF_UNSPEC;
|
|
if (!iquery) {
|
|
host.h_name = bp;
|
|
bp += strlen(bp) + 1;
|
|
}
|
|
}
|
|
|
|
bp += sizeof(align) - ((u_long)bp % sizeof(align));
|
|
|
|
if (bp + n >= &hostbuf[sizeof(hostbuf)]) {
|
|
#ifdef DEBUG
|
|
if (_res.options & RES_DEBUG)
|
|
printf("size (%d) too big\n", n);
|
|
#endif
|
|
break;
|
|
}
|
|
bcopy(cp, *hap++ = bp, n);
|
|
bp +=n;
|
|
cp += n;
|
|
haveanswer++;
|
|
}
|
|
if (haveanswer) {
|
|
*ap = NULL;
|
|
#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
|
|
*hap = NULL;
|
|
#else
|
|
host.h_addr = h_addr_ptrs[0];
|
|
#endif
|
|
return (&host);
|
|
} else {
|
|
h_errno = TRY_AGAIN;
|
|
return ((struct hostent *) NULL);
|
|
}
|
|
}
|
|
|
|
struct hostent *
|
|
gethostbyname(const char *name)
|
|
{
|
|
static querybuf buf;
|
|
register const char *cp;
|
|
int n;
|
|
extern struct hostent *_gethtbyname(char *name);
|
|
struct hostent *local_ht;
|
|
|
|
/*
|
|
* 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((struct hostent *) NULL);
|
|
}
|
|
host.h_name = (char *)name;
|
|
host.h_aliases = host_aliases;
|
|
host_aliases[0] = NULL;
|
|
host.h_addrtype = AF_INET;
|
|
host.h_length = sizeof(u_long);
|
|
h_addr_ptrs[0] = (char *)&host_addr;
|
|
h_addr_ptrs[1] = (char *)0;
|
|
#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
|
|
return (&host);
|
|
}
|
|
if (!isdigit(*cp) && *cp != '.')
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* GSTCP NOTE: I move this around so it checks /etc/hosts first.
|
|
*/
|
|
if (local_ht = _gethtbyname(name))
|
|
return local_ht;
|
|
|
|
if ((n = res_search(name, C_IN, T_A, buf.buf, sizeof(buf))) < 0) {
|
|
#ifdef DEBUG
|
|
if (_res.options & RES_DEBUG)
|
|
printf("res_search failed\n");
|
|
#endif
|
|
return ((struct hostent *) NULL);
|
|
}
|
|
return (getanswer(&buf, n, 0));
|
|
}
|
|
|
|
struct hostent *
|
|
gethostbyaddr(const char *addr, int len, int type)
|
|
{
|
|
static char qbuf[MAXDNAME];
|
|
static querybuf buf;
|
|
int n;
|
|
register struct hostent *hp;
|
|
extern struct hostent *_gethtbyaddr(const char *addr, int len, int type);
|
|
|
|
if (type != AF_INET)
|
|
return ((struct hostent *) 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, (char *)&buf, sizeof(buf));
|
|
if (n < 0) {
|
|
#ifdef DEBUG
|
|
if (_res.options & RES_DEBUG)
|
|
printf("res_query failed\n");
|
|
#endif
|
|
if (errno == ECONNREFUSED)
|
|
return (_gethtbyaddr(addr, len, type));
|
|
return ((struct hostent *) NULL);
|
|
}
|
|
hp = getanswer(&buf, n, 1);
|
|
if (hp == NULL)
|
|
return ((struct hostent *) NULL);
|
|
hp->h_addrtype = type;
|
|
hp->h_length = len;
|
|
h_addr_ptrs[0] = (char *)&host_addr;
|
|
h_addr_ptrs[1] = (char *)0;
|
|
host_addr = *(struct in_addr *)addr;
|
|
#if BSD < 43 && !defined(h_addr) /* new-style hostent structure */
|
|
hp->h_addr = h_addr_ptrs[0];
|
|
#endif
|
|
return(hp);
|
|
}
|
|
|
|
void _sethtent(int f)
|
|
{
|
|
if (hostf == NULL)
|
|
hostf = fopen(_PATH_HOSTS, "r" );
|
|
else
|
|
rewind(hostf);
|
|
stayopen |= f;
|
|
}
|
|
|
|
void _endhtent(void)
|
|
{
|
|
if (hostf && !stayopen) {
|
|
(void) fclose(hostf);
|
|
hostf = NULL;
|
|
}
|
|
}
|
|
|
|
struct hostent *
|
|
_gethtent(void)
|
|
{
|
|
char *p;
|
|
register char *cp, **q;
|
|
|
|
if (hostf == NULL && (hostf = fopen(_PATH_HOSTS, "r" )) == NULL)
|
|
return (NULL);
|
|
again:
|
|
if ((p = fgets(hostbuf, BUFSIZ, hostf)) == NULL)
|
|
return (NULL);
|
|
if (*p == '#')
|
|
goto again;
|
|
cp = strpbrk(p, "#\n");
|
|
if (cp == NULL)
|
|
goto again;
|
|
*cp = '\0';
|
|
cp = strpbrk(p, " \t");
|
|
if (cp == NULL)
|
|
goto again;
|
|
*cp++ = '\0';
|
|
/* THIS STUFF IS INTERNET SPECIFIC */
|
|
#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
|
|
host.h_addr_list = host_addrs;
|
|
#endif
|
|
host.h_addr = hostaddr;
|
|
*((u_long *)host.h_addr) = inet_addr(p);
|
|
host.h_length = sizeof (u_long);
|
|
host.h_addrtype = AF_INET;
|
|
while (*cp == ' ' || *cp == '\t')
|
|
cp++;
|
|
host.h_name = cp;
|
|
q = host.h_aliases = host_aliases;
|
|
cp = strpbrk(cp, " \t");
|
|
if (cp != NULL)
|
|
*cp++ = '\0';
|
|
while (cp && *cp) {
|
|
if (*cp == ' ' || *cp == '\t') {
|
|
cp++;
|
|
continue;
|
|
}
|
|
if (q < &host_aliases[MAXALIASES - 1])
|
|
*q++ = cp;
|
|
cp = strpbrk(cp, " \t");
|
|
if (cp != NULL)
|
|
*cp++ = '\0';
|
|
}
|
|
*q = NULL;
|
|
return (&host);
|
|
}
|
|
|
|
struct hostent *
|
|
_gethtbyname(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(const char *addr, int len, int type)
|
|
{
|
|
register struct hostent *p;
|
|
|
|
#ifdef __GNO__
|
|
#define bcmp(__a, __b, __l) memcmp(__a, __b, __l)
|
|
#endif
|
|
_sethtent(0);
|
|
while (p = _gethtent())
|
|
if (p->h_addrtype == type && !bcmp(p->h_addr, addr, len))
|
|
break;
|
|
_endhtent();
|
|
return (p);
|
|
}
|