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authorFlorian Weimer <fweimer@redhat.com>2021-07-19 07:55:27 +0200
committerFlorian Weimer <fweimer@redhat.com>2021-07-19 07:56:21 +0200
commit7131727c6ba451e1c5bf075194c7adc9292906c4 (patch)
tree97631b5bb76c074351e9d4278b7eeb290835b152 /resolv/res_queriesmatch.c
parent72a51ac647b2fc33a44434d3d125a844801609ae (diff)
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resolv: Move res_queriesmatch to its own file and into libc
And reformat it to GNU style. The treatment of this function matches res_nameinquery, for the reasons stated there. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'resolv/res_queriesmatch.c')
-rw-r--r--resolv/res_queriesmatch.c129
1 files changed, 129 insertions, 0 deletions
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)