diff options
Diffstat (limited to 'resolv')
| -rw-r--r-- | resolv/Makefile | 1 | ||||
| -rw-r--r-- | resolv/Versions | 1 | ||||
| -rw-r--r-- | resolv/res_queriesmatch.c | 129 | ||||
| -rw-r--r-- | resolv/res_send.c | 65 | ||||
| -rw-r--r-- | resolv/resolv-deprecated.c | 7 |
5 files changed, 144 insertions, 59 deletions
diff --git a/resolv/Makefile b/resolv/Makefile index c4c59dcac0..83ba39cb52 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 f3482793dd..5bbda96230 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 0000000000..4b56d33193 --- /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 a5a33e6f3b..b502ef5132 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 0fe9e4fda6..a2953db963 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); +} |