#include <machine/rtems-bsd-user-space.h>
/*
* ++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--
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/cdefs.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 <stdio.h>
#include <unistd.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include <netdb.h>
#include <rtems/rtems_netdb.h>
#include <resolv.h>
#include <ctype.h>
#include <errno.h>
#include <syslog.h>
#include "res_config.h"
void abort(void); /* to avoid warning */
#define SPRINTF(x) ((size_t)sprintf x)
#define MAXALIASES 35
#define MAXADDRS 35
static const char AskedForGot[] =
"gethostby*.gethostanswer: 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 */
#ifdef RESOLVSORT
static void addrsort(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;
int _dns_ttl_;
#ifdef DEBUG
static void
debugprintf(
char *msg,
int num)
{
if (_res.options & RES_DEBUG) {
int save = errno;
printf(msg, num);
errno = save;
}
}
#else
#define debugprintf(msg, num) /*nada*/
#endif
#define BOUNDED_INCR(x) \
do { \
cp += x; \
if (cp > eom) { \
h_errno = NO_RECOVERY; \
return (NULL); \
} \
} while (0)
#define BOUNDS_CHECK(ptr, count) \
do { \
if ((ptr) + (count) > eom) { \
h_errno = NO_RECOVERY; \
return (NULL); \
} \
} while (0)
static struct hostent *
gethostanswer(
const querybuf *answer,
int anslen,
const char *qname,
int qtype)
{
const HEADER *hp;
const u_char *cp;
int n;
const u_char *eom, *erdata;
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)(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:
h_errno = NO_RECOVERY;
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;
BOUNDED_INCR(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);
}
BOUNDED_INCR(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;
_dns_ttl_ = -1;
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 */
BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
type = _getshort(cp);
cp += INT16SZ; /* type */
class = _getshort(cp);
cp += INT16SZ; /* class */
if (qtype == T_A && type == T_A)
_dns_ttl_ = _getlong(cp);
cp += INT32SZ; /* TTL */
n = _getshort(cp);
cp += INT16SZ; /* len */
BOUNDS_CHECK(cp, n);
erdata = cp + n;
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;
if (cp != erdata) {
h_errno = NO_RECOVERY;
return (NULL);
}
/* 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;
if (cp != erdata) {
h_errno = NO_RECOVERY;
return (NULL);
}
/* 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*.gethostanswer: 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 (cp != erdata) {
h_errno = NO_RECOVERY;
return (NULL);
}
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) - ((uintptr_t)bp % sizeof(align));
if (bp + n >= &hostbuf[sizeof hostbuf]) {
debugprintf("size (%d) too big\n", n);
had_error++;
continue;
}
if (hap >= &h_addr_ptrs[MAXADDRS-1]) {
if (!toobig++)
debugprintf("Too many addresses (%d)\n",
MAXADDRS);
cp += n;
continue;
}
memcpy(*hap++ = bp, cp, n);
bp += n;
buflen -= n;
cp += n;
if (cp != erdata) {
h_errno = NO_RECOVERY;
return (NULL);
}
break;
default:
debugprintf("Impossible condition (type=%d)\n", type);
h_errno = NO_RECOVERY;
return (NULL);
/* BIND has abort() here, too risky on bad data */
}
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);
}
#if 0
struct hostent *
__dns_getanswer(const char *answer, int anslen, const char *qname, int qtype)
{
switch(qtype) {
case T_AAAA:
host.h_addrtype = AF_INET6;
host.h_length = IN6ADDRSZ;
break;
case T_A:
default:
host.h_addrtype = AF_INET;
host.h_length = INADDRSZ;
break;
}
return(gethostanswer((const querybuf *)answer, anslen, qname, qtype));
}
#endif
struct hostent *
_gethostbydnsname(
const char *name,
int af)
{
querybuf buf;
register const char *cp;
char *bp;
int n, size, type, len;
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((unsigned char)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((unsigned char)*cp) && *cp != '.')
break;
}
if ((isxdigit((unsigned char)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((unsigned char)*cp) && *cp != ':' && *cp != '.')
break;
}
if ((n = res_search(name, C_IN, type, buf.buf, sizeof(buf))) < 0) {
debugprintf("res_search failed (%d)\n", n);
return (NULL);
}
return (gethostanswer(&buf, n, name, type));
}
struct hostent *
_gethostbydnsaddr(
const char *addr, /* XXX should have been def'd as u_char! */
int len,
int 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*/
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) {
debugprintf("res_query failed (%d)\n", n);
return (NULL);
}
if (!(hp = gethostanswer(&buf, n, qbuf, T_PTR)))
return (NULL); /* h_errno was set by gethostanswer() */
#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;
memcpy(host_addr, 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);
}
#ifdef RESOLVSORT
static void
addrsort(
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
void
_sethostdnsent(int stayopen)
{
if ((_res.options & RES_INIT) == 0 && res_init() == -1)
return;
if (stayopen)
_res.options |= RES_STAYOPEN | RES_USEVC;
}
void
_endhostdnsent(void)
{
_res.options &= ~(RES_STAYOPEN | RES_USEVC);
res_close();
}
