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authorUlrich Drepper <drepper@redhat.com>1999-12-04 18:05:55 +0000
committerUlrich Drepper <drepper@redhat.com>1999-12-04 18:05:55 +0000
commitb43b13ac2544b11f35be301d1589b51a8473e32b (patch)
tree6520da2e17c933ebc29b4572cdcc27410b10a4c4 /resolv/res_query.c
parent591e1ffbf8db5e059b9bcf3bde6d7758f018a46d (diff)
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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.
Diffstat (limited to 'resolv/res_query.c')
-rw-r--r--resolv/res_query.c261
1 files changed, 131 insertions, 130 deletions
diff --git a/resolv/res_query.c b/resolv/res_query.c
index 80c1034..deebf4c 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);