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-rw-r--r--lib/libc/net/gethostnamadr.c522
1 files changed, 37 insertions, 485 deletions
diff --git a/lib/libc/net/gethostnamadr.c b/lib/libc/net/gethostnamadr.c
index cbb7d74..1e8672a 100644
--- a/lib/libc/net/gethostnamadr.c
+++ b/lib/libc/net/gethostnamadr.c
@@ -1,6 +1,5 @@
/*-
- * Copyright (c) 1985, 1988, 1993
- * The Regents of the University of California. All rights reserved.
+ * Copyright (c) 1994, Garrett Wollman
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -10,15 +9,8 @@
* 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
+ * THIS SOFTWARE IS PROVIDED BY THE 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
@@ -29,49 +21,29 @@
* 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[] = "From: @(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
-/*static char rcsid[] = "From: Id: gethnamaddr.c,v 4.9.1.1 1993/05/02 22:43:03 vixie Rel ";*/
-static const char rcsid[] =
- "$Id: gethostnamadr.c,v 1.3 1994/08/09 22:44:12 wollman Exp $";
+static char sccsid[] = "@(#)$Id$";
+static char rcsid[] = "$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 <netdb.h>
-#include <resolv.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
-#define MAXALIASES 35
-#define MAXADDRS 35
+extern struct hostent * _gethostbyhtname __P((const char *));
+extern struct hostent * _gethostbydnsname __P((const char *));
+extern struct hostent * _gethostbynisname __P((const char *));
+extern struct hostent * _gethostbyhtaddr __P((const char *, int, int));
+extern struct hostent * _gethostbydnsaddr __P((const char *, int, int));
+extern struct hostent * _gethostbynisaddr __P((const char *, int, int));
#define _PATH_HOSTCONF "/etc/host.conf"
@@ -102,35 +74,6 @@ static struct {
static enum service_type service_order[SERVICE_MAX + 1];
static int service_done = 0;
-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 {
- int32_t al;
- char ac;
-} align;
-
-extern int h_errno;
-
static enum service_type
get_service_name(const char *name) {
int i;
@@ -174,429 +117,27 @@ init_services()
service_done = 1;
}
-static struct hostent *
-getanswer(answer, anslen, iquery)
- 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_int16_t);
- class = _getshort(cp);
- cp += sizeof(u_int16_t) + sizeof(u_int32_t);
- n = _getshort(cp);
- cp += sizeof(u_int16_t);
- 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_int32_t)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 *
-_getdnsbyname(name)
- const char *name;
-{
- querybuf buf;
- register const char *cp;
- int n;
- extern struct hostent *_gethtbyname();
-
- /*
- * 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_int32_t);
- 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;
- }
-
- 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 *
-_getdnsbyaddr(addr, len, type)
- const char *addr;
- int len, type;
-{
- int n;
- querybuf buf;
- register struct hostent *hp;
- char qbuf[MAXDNAME];
- extern struct hostent *_gethtbyaddr();
-
- 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
- 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(f)
- int f;
-{
- if (hostf == NULL)
- 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 == 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_int32_t *)host.h_addr) = inet_addr(p);
- host.h_length = sizeof (u_int32_t);
- 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(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 YP
-struct hostent *
-_getnishost(name, map)
- char *name, *map;
-{
- register char *cp, *dp, **q;
- char *result;
- int resultlen;
- static struct hostent h;
- static char *domain = (char *)NULL;
-
- if (domain == (char *)NULL)
- if (yp_get_default_domain (&domain))
- return ((struct hostent *)NULL);
-
- if (yp_match(domain, map, name, strlen(name), &result, &resultlen))
- return ((struct hostent *)NULL);
-
- if (cp = index(result, '\n'))
- *cp = '\0';
-
- cp = strpbrk(result, " \t");
- *cp++ = '\0';
-#if BSD >= 43 || defined(h_addr) /* new-style hostent structure */
- h.h_addr_list = host_addrs;
-#endif
- h.h_addr = hostaddr;
- *((u_long *)h.h_addr) = inet_addr(result);
- h.h_length = sizeof(u_long);
- h.h_addrtype = AF_INET;
- while (*cp == ' ' || *cp == '\t')
- cp++;
- h.h_name = cp;
- q = h.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 (&h);
-}
-#endif /* YP */
-
struct hostent *
gethostbyname(const char *name)
{
struct hostent *hp = 0;
int nserv = 0;
- if(!service_done) {
+ if (!service_done)
init_services();
- }
- while(!hp) {
- switch(service_order[nserv]) {
+ while (!hp) {
+ switch (service_order[nserv]) {
case SERVICE_NONE:
- return 0;
+ return NULL;
case SERVICE_HOSTS:
- hp = _gethtbyname(name);
+ hp = _gethostbyhtname(name);
break;
case SERVICE_BIND:
- hp = _getdnsbyname(name);
+ hp = _gethostbydnsname(name);
break;
case SERVICE_NIS:
-#ifdef YP
- hp = _getnishost(name, "hosts.byname");
-#endif
+ hp = _gethostbynisname(name);
break;
}
nserv++;
@@ -610,24 +151,21 @@ gethostbyaddr(const char *addr, int len, int type)
struct hostent *hp = 0;
int nserv = 0;
- if(!service_done) {
+ if (!service_done)
init_services();
- }
- while(!hp) {
- switch(service_order[nserv]) {
+ while (!hp) {
+ switch (service_order[nserv]) {
case SERVICE_NONE:
return 0;
case SERVICE_HOSTS:
- hp = _gethtbyaddr(addr, len, type);
+ hp = _gethostbyhtaddr(addr, len, type);
break;
case SERVICE_BIND:
- hp = _getdnsbyaddr(addr, len, type);
+ hp = _gethostbydnsaddr(addr, len, type);
break;
case SERVICE_NIS:
-#ifdef YP
- hp = _getnishost(addr, "hosts.byaddr");
-#endif
+ hp = _gethostbynisaddr(addr, len, type);
break;
}
nserv++;
@@ -635,3 +173,17 @@ gethostbyaddr(const char *addr, int len, int type)
return hp;
}
+void
+sethostent(stayopen)
+ int stayopen;
+{
+ _sethosthtent(stayopen);
+ _sethostdnsent(stayopen);
+}
+
+void
+endhostent()
+{
+ _endhosthtent();
+ _endhostdnsent();
+}
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