Update.

1999-12-03  Andreas Jaeger  <aj@suse.de>

	* nss/getXXbyYY.c: Include <resolv.h>
	(FUNCTION_NAME): Use res_ninit instead of res_init.

	* nss/getXXbyYY_r.c [NEED__RES]: Include <resolv.h> for _res
	declaration and prototypes.
	Remove extra _res declaration.
	(INTERNAL): Use thread aware res_ninit function.

	* inet/gethstbyad_r.c: Include <resolv.h>.

	* resolv/res_data.c: Update from Bind 8.2.2-P5.  Moved res_init to
	res_libc.c.  Disabled unneeded functions.

	* resolv/res_libc.c: New file.

	* Versions.def: Add version GLIBC_2.2 for libpthread.
	Add versions GLIBC_2.1 and GLIBC_2.2 for libresolv.

	* include/resolv.h: Add internal interfaces.

	* resolv/Makefile (routines): Add new files.
	(libresolv-routines): Likewise.
	(distribute): Likewise.

	* resolv/gethnamaddr.c: Use thread safe resolver functions.
	* resolv/nss_dns/dns-host.c: Likewise.
	* resolv/nss_dns/dns-network.c: Likewise.

	* resolv/arpa/nameser.h: Update from Bind 8.2.2-P5.
	* resolv/nsap_addr.c: Likewise.
	* resolv/res_comp.c: Likewise.
	* resolv/res_debug.c: Likewise.
	* resolv/res_init.c: Likewise.
	* resolv/res_mkquery.c: Likewise.
	* resolv/res_query.c: Likewise.
	* resolv/res_send.c: Likewise.
	* resolv/resolv.h: Likewise.

	* resolv/Versions: Add __res_state and __res_ninit with version
	GLIBC_2.2 to libc.
	Add new interfaces with version GLIBC_2.2 to libresolv.

	* resolv/Banner: Update.

	* include/arpa/nameser_compat.h: New file.

	* resolv/ns_name.c: New file from Bind 8.2.2-P5.
	* resolv/ns_netint.c: Likewise.
	* resolv/ns_parse.c: Likewise.
	* resolv/ns_print.c: Likewise.
	* resolv/ns_samedomain.c: Likewise.
	* resolv/ns_ttl.c: Likewise.
	* resolv/arpa/nameser_compat.h: Likewise.
	* resolv/res_debug.h: Likewise.

	Some patches are based on work done by Adam D. Bradley
	<artdodge@cs.bu.edu>.

	* sysdeps/unix/sysv/linux/configure.in: Remove check for ldconfig,
	set always use_ldconfig instead.

1 files changed, 131 insertions, 130 deletions

diff --git a/resolv/res_query.c b/resolv/res_query.c
index 80c10344f9..deebf4c62b 100644
--- a/resolv/res_query.c
+++ b/resolv/res_query.c
@@ -1,6 +1,4 @@
 /*
- * ++Copyright++ 1988, 1993
- * -
  * Copyright (c) 1988, 1993
  *    The Regents of the University of California.  All rights reserved.
  *
@@ -27,7 +25,9 @@
  * 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
@@ -45,13 +45,28 @@
  * 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--
+ */
+
+/*
+ * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
+ *
+ * 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.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM 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.
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char sccsid[] = "@(#)res_query.c	8.1 (Berkeley) 6/4/93";
-static char rcsid[] = "$Id$";
+static const char sccsid[] = "@(#)res_query.c	8.1 (Berkeley) 6/4/93";
+static const char rcsid[] = "$Id$";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/types.h>
@@ -59,22 +74,16 @@ static char rcsid[] = "$Id$";
 #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>
-#if defined(BSD) && (BSD >= 199306)
-# include <stdlib.h>
-# include <string.h>
-#else
-# include "../conf/portability.h"
-#endif
+#include <netdb.h>
+#include <resolv.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
-#if defined(USE_OPTIONS_H)
-# include <../conf/options.h>
-#endif
+/* Options.  Leave them on. */
+/* #undef DEBUG */
 
 #if PACKETSZ > 1024
 #define MAXPACKET	PACKETSZ
@@ -82,82 +91,75 @@ static char rcsid[] = "$Id$";
 #define MAXPACKET	1024
 #endif
 
-const char *hostalias __P((const char *));
-
-
 /*
  * Formulate a normal query, send, and await answer.
  * Returned answer is placed in supplied buffer "answer".
  * Perform preliminary check of answer, returning success only
  * if no error is indicated and the answer count is nonzero.
  * Return the size of the response on success, -1 on error.
- * Error number is left in h_errno.
+ * Error number is left in H_ERRNO.
  *
  * Caller must parse answer and determine whether it answers the question.
  */
 int
-res_query(name, class, type, answer, anslen)
-	const char *name;	/* domain name */
-	int class, type;	/* class and type of query */
-	u_char *answer;		/* buffer to put answer */
-	int anslen;		/* size of answer buffer */
+res_nquery(res_state statp,
+	   const char *name,	/* domain name */
+	   int class, int type,	/* class and type of query */
+	   u_char *answer,	/* buffer to put answer */
+	   int anslen)		/* size of answer buffer */
 {
 	u_char buf[MAXPACKET];
-	register HEADER *hp = (HEADER *) answer;
+	HEADER *hp = (HEADER *) answer;
 	int n;
 
 	hp->rcode = NOERROR;	/* default */
 
-	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
-		__set_h_errno (NETDB_INTERNAL);
-		return (-1);
-	}
 #ifdef DEBUG
-	if (_res.options & RES_DEBUG)
+	if (statp->options & RES_DEBUG)
 		printf(";; res_query(%s, %d, %d)\n", name, class, type);
 #endif
 
-	n = res_mkquery(QUERY, name, class, type, NULL, 0, NULL,
-			buf, sizeof(buf));
+	n = res_nmkquery(statp, QUERY, name, class, type, NULL, 0, NULL,
+			 buf, sizeof(buf));
 	if (n <= 0) {
 #ifdef DEBUG
-		if (_res.options & RES_DEBUG)
+		if (statp->options & RES_DEBUG)
 			printf(";; res_query: mkquery failed\n");
 #endif
-		__set_h_errno (NO_RECOVERY);
+		RES_SET_H_ERRNO(statp, NO_RECOVERY);
 		return (n);
 	}
-	n = res_send(buf, n, answer, anslen);
+	n = res_nsend(statp, buf, n, answer, anslen);
 	if (n < 0) {
 #ifdef DEBUG
-		if (_res.options & RES_DEBUG)
+		if (statp->options & RES_DEBUG)
 			printf(";; res_query: send error\n");
 #endif
-		__set_h_errno (TRY_AGAIN);
+		RES_SET_H_ERRNO(statp, TRY_AGAIN);
 		return (n);
 	}
 
 	if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
 #ifdef DEBUG
-		if (_res.options & RES_DEBUG)
+		if (statp->options & RES_DEBUG)
 			printf(";; rcode = %d, ancount=%d\n", hp->rcode,
 			    ntohs(hp->ancount));
 #endif
 		switch (hp->rcode) {
 		case NXDOMAIN:
-			__set_h_errno (HOST_NOT_FOUND);
+			RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
 			break;
 		case SERVFAIL:
-			__set_h_errno (TRY_AGAIN);
+			RES_SET_H_ERRNO(statp, TRY_AGAIN);
 			break;
 		case NOERROR:
-			__set_h_errno (NO_DATA);
+			RES_SET_H_ERRNO(statp, NO_DATA);
 			break;
 		case FORMERR:
 		case NOTIMP:
 		case REFUSED:
 		default:
-			__set_h_errno (NO_RECOVERY);
+			RES_SET_H_ERRNO(statp, NO_RECOVERY);
 			break;
 		}
 		return (-1);
@@ -169,52 +171,43 @@ res_query(name, class, type, answer, anslen)
  * Formulate a normal query, send, and retrieve answer in supplied buffer.
  * Return the size of the response on success, -1 on error.
  * If enabled, implement search rules until answer or unrecoverable failure
- * is detected.  Error code, if any, is left in h_errno.
+ * is detected.  Error code, if any, is left in H_ERRNO.
  */
 int
-res_search(name, class, type, answer, anslen)
-	const char *name;	/* domain name */
-	int class, type;	/* class and type of query */
-	u_char *answer;		/* buffer to put answer */
-	int anslen;		/* size of answer */
+res_nsearch(res_state statp,
+	    const char *name,	/* domain name */
+	    int class, int type,	/* class and type of query */
+	    u_char *answer,	/* buffer to put answer */
+	    int anslen)		/* size of answer */
 {
-	register const char *cp, * const *domain;
+	const char *cp, * const *domain;
 	HEADER *hp = (HEADER *) answer;
+	char tmp[NS_MAXDNAME];
 	u_int dots;
-	int trailing_dot, ret, saved_herrno;
-	int got_nodata = 0, got_servfail = 0, tried_as_is = 0;
+	int trailing_dot, ret;
+	int got_nodata = 0, got_servfail = 0, root_on_list = 0;
 
-	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
-		__set_h_errno (NETDB_INTERNAL);
-		return (-1);
-	}
 	__set_errno (0);
-	__set_h_errno (HOST_NOT_FOUND);	/* default, if we never query */
+	RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);  /* True if we never query. */
+
 	dots = 0;
-	for (cp = name; *cp; cp++)
+	for (cp = name; *cp != '\0'; cp++)
 		dots += (*cp == '.');
 	trailing_dot = 0;
 	if (cp > name && *--cp == '.')
 		trailing_dot++;
 
-	/*
-	 * if there aren't any dots, it could be a user-level alias
-	 */
-	if (!dots && (cp = __hostalias(name)) != NULL)
-		return (res_query(cp, class, type, answer, anslen));
+	/* If there aren't any dots, it could be a user-level alias. */
+	if (!dots && (cp = res_hostalias(statp, name, tmp, sizeof tmp))!= NULL)
+		return (res_nquery(statp, cp, class, type, answer, anslen));
 
 	/*
-	 * If there are dots in the name already, let's just give it a try
-	 * 'as is'.  The threshold can be set with the "ndots" option.
+	 * If there are enough dots in the name, do no searching.
+	 * (The threshold can be set with the "ndots" option.)
 	 */
-	saved_herrno = -1;
-	if (dots >= _res.ndots) {
-		ret = res_querydomain(name, NULL, class, type, answer, anslen);
-		if (ret > 0)
-			return (ret);
-		saved_herrno = h_errno;
-		tried_as_is++;
-	}
+	if (dots >= statp->ndots || trailing_dot)
+		return (res_nquerydomain(statp, name, NULL, class, type,
+					 answer, anslen));
 
 	/*
 	 * We do at least one level of search if
@@ -222,16 +215,21 @@ res_search(name, class, type, answer, anslen)
 	 *	- there is at least one dot, there is no trailing dot,
 	 *	  and RES_DNSRCH is set.
 	 */
-	if ((!dots && (_res.options & RES_DEFNAMES)) ||
-	    (dots && !trailing_dot && (_res.options & RES_DNSRCH))) {
+	if ((!dots && (statp->options & RES_DEFNAMES) != 0) ||
+	    (dots && !trailing_dot && (statp->options & RES_DNSRCH) != 0)) {
 		int done = 0;
 
-		for (domain = (const char * const *)_res.dnsrch;
+		for (domain = (const char * const *)statp->dnsrch;
 		     *domain && !done;
 		     domain++) {
 
-			ret = res_querydomain(name, *domain, class, type,
-					      answer, anslen);
+			if (domain[0][0] == '\0' ||
+			    (domain[0][0] == '.' && domain[0][1] == '\0'))
+				root_on_list++;
+
+			ret = res_nquerydomain(statp, name, *domain,
+					       class, type,
+					       answer, anslen);
 			if (ret > 0)
 				return (ret);
 
@@ -249,11 +247,11 @@ res_search(name, class, type, answer, anslen)
 			 * fully-qualified.
 			 */
 			if (errno == ECONNREFUSED) {
-				__set_h_errno (TRY_AGAIN);
+				RES_SET_H_ERRNO(statp, TRY_AGAIN);
 				return (-1);
 			}
 
-			switch (h_errno) {
+			switch (statp->res_h_errno) {
 			case NO_DATA:
 				got_nodata++;
 				/* FALLTHROUGH */
@@ -275,34 +273,33 @@ res_search(name, class, type, answer, anslen)
 			/* if we got here for some reason other than DNSRCH,
 			 * we only wanted one iteration of the loop, so stop.
 			 */
-			if (!(_res.options & RES_DNSRCH))
+			if ((statp->options & RES_DNSRCH) == 0)
 				done++;
 		}
 	}
 
-	/* if we have not already tried the name "as is", do that now.
-	 * note that we do this regardless of how many dots were in the
-	 * name or whether it ends with a dot.
+	/*
+	 * If the name has any dots at all, and "." is not on the search
+	 * list, then try an as-is query now.
 	 */
-	if (!tried_as_is) {
-		ret = res_querydomain(name, NULL, class, type, answer, anslen);
+	if (statp->ndots) {
+		ret = res_nquerydomain(statp, name, NULL, class, type,
+				       answer, anslen);
 		if (ret > 0)
 			return (ret);
 	}
 
 	/* if we got here, we didn't satisfy the search.
-	 * if we did an initial full query, return that query's h_errno
+	 * if we did an initial full query, return that query's H_ERRNO
 	 * (note that we wouldn't be here if that query had succeeded).
 	 * else if we ever got a nodata, send that back as the reason.
-	 * else send back meaningless h_errno, that being the one from
+	 * else send back meaningless H_ERRNO, that being the one from
 	 * the last DNSRCH we did.
 	 */
-	if (saved_herrno != -1)
-		__set_h_errno (saved_herrno);
-	else if (got_nodata)
-		__set_h_errno (NO_DATA);
+	if (got_nodata)
+		RES_SET_H_ERRNO(statp, NO_DATA);
 	else if (got_servfail)
-		__set_h_errno (TRY_AGAIN);
+		RES_SET_H_ERRNO(statp, TRY_AGAIN);
 	return (-1);
 }
 
@@ -311,23 +308,20 @@ res_search(name, class, type, answer, anslen)
  * removing a trailing dot from name if domain is NULL.
  */
 int
-res_querydomain(name, domain, class, type, answer, anslen)
-	const char *name, *domain;
-	int class, type;	/* class and type of query */
-	u_char *answer;		/* buffer to put answer */
-	int anslen;		/* size of answer */
+res_nquerydomain(res_state statp,
+	    const char *name,
+	    const char *domain,
+	    int class, int type,	/* class and type of query */
+	    u_char *answer,		/* buffer to put answer */
+	    int anslen)		/* size of answer */
 {
-	char nbuf[MAXDNAME * 2 + 2];
+	char nbuf[MAXDNAME];
 	const char *longname = nbuf;
-	int n;
+	int n, d;
 
-	if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
-		__set_h_errno (NETDB_INTERNAL);
-		return (-1);
-	}
 #ifdef DEBUG
-	if (_res.options & RES_DEBUG)
-		printf(";; res_querydomain(%s, %s, %d, %d)\n",
+	if (statp->options & RES_DEBUG)
+		printf(";; res_nquerydomain(%s, %s, %d, %d)\n",
 		       name, domain?domain:"<Nil>", class, type);
 #endif
 	if (domain == NULL) {
@@ -335,30 +329,36 @@ res_querydomain(name, domain, class, type, answer, anslen)
 		 * Check for trailing '.';
 		 * copy without '.' if present.
 		 */
-		n = strlen(name) - 1;
-		if (n != (0 - 1) && name[n] == '.'
-		    && n < (int) (sizeof(nbuf) - 1)) {
-			bcopy(name, nbuf, n);
+		n = strlen(name);
+		if (n >= MAXDNAME) {
+			RES_SET_H_ERRNO(statp, NO_RECOVERY);
+			return (-1);
+		}
+		n--;
+		if (n >= 0 && name[n] == '.') {
+			strncpy(nbuf, name, n);
 			nbuf[n] = '\0';
 		} else
 			longname = name;
-	} else
-		sprintf(nbuf, "%.*s.%.*s", MAXDNAME, name, MAXDNAME, domain);
-
-	return (res_query(longname, class, type, answer, anslen));
+	} else {
+		n = strlen(name);
+		d = strlen(domain);
+		if (n + d + 1 >= MAXDNAME) {
+			RES_SET_H_ERRNO(statp, NO_RECOVERY);
+			return (-1);
+		}
+		sprintf(nbuf, "%s.%s", name, domain);
+	}
+	return (res_nquery(statp, longname, class, type, answer, anslen));
 }
 
 const char *
-hostalias(name)
-	register const char *name;
-{
-	register char *cp1, *cp2;
-	FILE *fp;
-	char *file;
+res_hostalias(const res_state statp, const char *name, char *dst, size_t siz) {
+	char *file, *cp1, *cp2;
 	char buf[BUFSIZ];
-	static char abuf[MAXDNAME];
+	FILE *fp;
 
-	if (_res.options & RES_NOALIASES)
+	if (statp->options & RES_NOALIASES)
 		return (NULL);
 	file = __secure_getenv("HOSTALIASES");
 	if (file == NULL || (fp = fopen(file, "r")) == NULL)
@@ -371,17 +371,18 @@ hostalias(name)
 		if (!*cp1)
 			break;
 		*cp1 = '\0';
-		if (!strcasecmp(buf, name)) {
+		if (ns_samename(buf, name) == 1) {
 			while (isspace(*++cp1))
 				;
 			if (!*cp1)
 				break;
 			for (cp2 = cp1 + 1; *cp2 && !isspace(*cp2); ++cp2)
 				;
-			abuf[sizeof(abuf) - 1] = *cp2 = '\0';
-			strncpy(abuf, cp1, sizeof(abuf) - 1);
+			*cp2 = '\0';
+			strncpy(dst, cp1, siz - 1);
+			dst[siz - 1] = '\0';
 			fclose(fp);
-			return (abuf);
+			return (dst);
 		}
 	}
 	fclose(fp);