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-rw-r--r--include/resolv.h3
-rw-r--r--resolv/Makefile1
-rw-r--r--resolv/Versions1
-rw-r--r--resolv/res_queriesmatch.c129
-rw-r--r--resolv/res_send.c65
-rw-r--r--resolv/resolv-deprecated.c7
6 files changed, 146 insertions, 60 deletions
diff --git a/include/resolv.h b/include/resolv.h
index 4d328fe..3590b6f 100644
--- a/include/resolv.h
+++ b/include/resolv.h
@@ -54,7 +54,6 @@ libresolv_hidden_proto (__p_type)
libresolv_hidden_proto (__loc_ntoa)
libresolv_hidden_proto (__fp_nquery)
libresolv_hidden_proto (__fp_query)
-libresolv_hidden_proto (__res_queriesmatch)
libresolv_hidden_proto (__b64_ntop)
libresolv_hidden_proto (__dn_count_labels)
@@ -68,6 +67,8 @@ extern __typeof (res_hnok) __libc_res_hnok;
libc_hidden_proto (__libc_res_hnok)
extern __typeof (__res_nameinquery) __libc_res_nameinquery;
libc_hidden_proto (__libc_res_nameinquery)
+extern __typeof (__res_queriesmatch) __libc_res_queriesmatch;
+libc_hidden_proto (__libc_res_queriesmatch)
# endif /* _RESOLV_H_ && !_ISOMAC */
#endif
diff --git a/resolv/Makefile b/resolv/Makefile
index c4c59dc..83ba39c 100644
--- a/resolv/Makefile
+++ b/resolv/Makefile
@@ -53,6 +53,7 @@ routines := \
res_init \
res_libc \
res_nameinquery \
+ res_queriesmatch \
res_randomid \
resolv_conf \
resolv_context \
diff --git a/resolv/Versions b/resolv/Versions
index f348279..5bbda96 100644
--- a/resolv/Versions
+++ b/resolv/Versions
@@ -77,6 +77,7 @@ libc {
__libc_res_dnok;
__libc_res_hnok;
__libc_res_nameinquery;
+ __libc_res_queriesmatch;
__ns_name_compress;
__ns_name_ntop;
__ns_name_pack;
diff --git a/resolv/res_queriesmatch.c b/resolv/res_queriesmatch.c
new file mode 100644
index 0000000..4b56d33
--- /dev/null
+++ b/resolv/res_queriesmatch.c
@@ -0,0 +1,129 @@
+/* Check if two DNS packets contain the same query.
+ Copyright (C) 2016-2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/*
+ * Copyright (c) 1985, 1989, 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.
+ * 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.
+ */
+
+/*
+ * 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.
+ */
+
+#include <resolv.h>
+
+/* Author: paul vixie, 29may94. */
+int
+__libc_res_queriesmatch (const unsigned char *buf1, const unsigned char *eom1,
+ const unsigned char *buf2, const unsigned char *eom2)
+{
+ if (eom1 - buf1 < HFIXEDSZ || eom2 - buf2 < HFIXEDSZ)
+ return -1;
+
+ /* Only header section present in replies to dynamic update
+ packets. */
+ if ((((HEADER *) buf1)->opcode == ns_o_update) &&
+ (((HEADER *) buf2)->opcode == ns_o_update))
+ return 1;
+
+ /* Note that we initially do not convert QDCOUNT to the host byte
+ order. We can compare it with the second buffer's QDCOUNT
+ value without doing this. */
+ int qdcount = ((HEADER *) buf1)->qdcount;
+ if (qdcount != ((HEADER *) buf2)->qdcount)
+ return 0;
+
+ qdcount = htons (qdcount);
+ const unsigned char *cp = buf1 + HFIXEDSZ;
+
+ while (qdcount-- > 0)
+ {
+ char tname[MAXDNAME+1];
+ int n, ttype, tclass;
+
+ n = __libc_dn_expand (buf1, eom1, cp, tname, sizeof tname);
+ if (n < 0)
+ return -1;
+ cp += n;
+ if (eom1 - cp < 4)
+ return -1;
+ NS_GET16 (ttype, cp);
+ NS_GET16 (tclass, cp);
+ if (!__libc_res_nameinquery (tname, ttype, tclass, buf2, eom2))
+ return 0;
+ }
+ return 1;
+}
+libc_hidden_def (__libc_res_queriesmatch)
diff --git a/resolv/res_send.c b/resolv/res_send.c
index a5a33e6..b502ef5 100644
--- a/resolv/res_send.c
+++ b/resolv/res_send.c
@@ -248,61 +248,6 @@ mask_ad_bit (struct resolv_context *ctx, void *buf)
((HEADER *) buf)->ad = 0;
}
-/* int
- * res_queriesmatch(buf1, eom1, buf2, eom2)
- * is there a 1:1 mapping of (name,type,class)
- * in (buf1,eom1) and (buf2,eom2)?
- * returns:
- * -1 : format error
- * 0 : not a 1:1 mapping
- * >0 : is a 1:1 mapping
- * author:
- * paul vixie, 29may94
- */
-int
-res_queriesmatch(const u_char *buf1, const u_char *eom1,
- const u_char *buf2, const u_char *eom2)
-{
- if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2)
- return (-1);
-
- /*
- * Only header section present in replies to
- * dynamic update packets.
- */
- if ((((HEADER *)buf1)->opcode == ns_o_update) &&
- (((HEADER *)buf2)->opcode == ns_o_update))
- return (1);
-
- /* Note that we initially do not convert QDCOUNT to the host byte
- order. We can compare it with the second buffer's QDCOUNT
- value without doing this. */
- int qdcount = ((HEADER*)buf1)->qdcount;
- if (qdcount != ((HEADER*)buf2)->qdcount)
- return (0);
-
- qdcount = htons (qdcount);
- const u_char *cp = buf1 + HFIXEDSZ;
-
- while (qdcount-- > 0) {
- char tname[MAXDNAME+1];
- int n, ttype, tclass;
-
- n = __libc_dn_expand (buf1, eom1, cp, tname, sizeof tname);
- if (n < 0)
- return (-1);
- cp += n;
- if (cp + 2 * INT16SZ > eom1)
- return (-1);
- NS_GET16(ttype, cp);
- NS_GET16(tclass, cp);
- if (!__libc_res_nameinquery (tname, ttype, tclass, buf2, eom2))
- return (0);
- }
- return (1);
-}
-libresolv_hidden_def (res_queriesmatch)
-
int
__res_context_send (struct resolv_context *ctx,
const unsigned char *buf, int buflen,
@@ -1239,13 +1184,15 @@ send_dg(res_state statp,
int matching_query = 0; /* Default to no matching query. */
if (!recvresp1
&& anhp->id == hp->id
- && res_queriesmatch (buf, buf + buflen,
- *thisansp, *thisansp + *thisanssizp))
+ && __libc_res_queriesmatch (buf, buf + buflen,
+ *thisansp,
+ *thisansp + *thisanssizp))
matching_query = 1;
if (!recvresp2
&& anhp->id == hp2->id
- && res_queriesmatch (buf2, buf2 + buflen2,
- *thisansp, *thisansp + *thisanssizp))
+ && __libc_res_queriesmatch (buf2, buf2 + buflen2,
+ *thisansp,
+ *thisansp + *thisanssizp))
matching_query = 2;
if (matching_query == 0)
/* Spurious UDP packet. Drop it and continue
diff --git a/resolv/resolv-deprecated.c b/resolv/resolv-deprecated.c
index 0fe9e4f..a2953db9 100644
--- a/resolv/resolv-deprecated.c
+++ b/resolv/resolv-deprecated.c
@@ -47,3 +47,10 @@ res_nameinquery (const char *name, int type, int class,
{
return __libc_res_nameinquery (name, type, class, buf, eom);
}
+
+int
+res_queriesmatch (const unsigned char *buf1, const unsigned char *eom1,
+ const unsigned char *buf2, const unsigned char *eom2)
+{
+ return __libc_res_queriesmatch (buf1, eom1, buf2, eom2);
+}