From patchwork Thu Jul 8 15:05:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Weimer X-Patchwork-Id: 44241 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id CB9CD384F003 for ; Thu, 8 Jul 2021 15:18:30 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CB9CD384F003 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1625757510; bh=k5bS59jYJCHeefdaiuty2Ss84zxBhdjebIwixYf+xJs=; h=To:Subject:In-Reply-To:References:Date:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=ggLY0FhvlMUD7srxyQoBLx//TYBd7X2I5WtlAptVX4JKJ9Tik3+y8ArG0gtooz/dX 9ZU03ikceIPuQxV3YETXPPP9NRkfNAuldBtFYaOQrmGOKr0TotR6Tq/dqEZmx5jyKk 7YOcK9ubi8K0acLzly+3GoAPTjPsfmAvAt1+SCm8= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by sourceware.org (Postfix) with ESMTP id 2AF00398D040 for ; Thu, 8 Jul 2021 15:05:33 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 2AF00398D040 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-575-CNuNA-9-OY2DsknfgEyJ9Q-1; Thu, 08 Jul 2021 11:05:31 -0400 X-MC-Unique: CNuNA-9-OY2DsknfgEyJ9Q-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5088E18A0735 for ; Thu, 8 Jul 2021 15:05:30 +0000 (UTC) Received: from oldenburg.str.redhat.com (ovpn-115-5.ams2.redhat.com [10.36.115.5]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 71B225D6D1 for ; Thu, 8 Jul 2021 15:05:29 +0000 (UTC) To: libc-alpha@sourceware.org Subject: [PATCH 20/30] resolv: Move ns_makecanon into its own file, and into libc In-Reply-To: References: X-From-Line: 363804ea0b68d8f90d9be5e7e9fbf0757188d176 Mon Sep 17 00:00:00 2001 Message-Id: <363804ea0b68d8f90d9be5e7e9fbf0757188d176.1625755446.git.fweimer@redhat.com> Date: Thu, 08 Jul 2021 17:05:27 +0200 User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-12.8 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Florian Weimer via Libc-alpha From: Florian Weimer Reply-To: Florian Weimer Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" But only as an internal symbol, __libc_ns_makecanon. The libresolv ABI is preserved. This is because the function is deprecated, and it does not make sense to add new symbol versions for deprecated functions. Also reformat the implementation to GNU style. Reviewed-by: Carlos O'Donell Tested-by: Carlos O'Donell --- include/arpa/nameser.h | 3 ++- resolv/Makefile | 2 ++ resolv/Versions | 1 + resolv/ns_makecanon.c | 50 ++++++++++++++++++++++++++++++++++++++ resolv/ns_samedomain.c | 38 ++--------------------------- resolv/resolv-deprecated.c | 35 ++++++++++++++++++++++++++ 6 files changed, 92 insertions(+), 37 deletions(-) create mode 100644 resolv/ns_makecanon.c create mode 100644 resolv/resolv-deprecated.c diff --git a/include/arpa/nameser.h b/include/arpa/nameser.h index eff25178c8..a529cc86d3 100644 --- a/include/arpa/nameser.h +++ b/include/arpa/nameser.h @@ -69,9 +69,10 @@ libresolv_hidden_proto (ns_sprintrr) libresolv_hidden_proto (ns_sprintrrf) libresolv_hidden_proto (ns_samedomain) libresolv_hidden_proto (ns_samename) -libresolv_hidden_proto (ns_makecanon) libresolv_hidden_proto (ns_format_ttl) +extern __typeof (ns_makecanon) __libc_ns_makecanon; +libc_hidden_proto (__libc_ns_makecanon) extern __typeof (ns_name_compress) __ns_name_compress; libc_hidden_proto (__ns_name_compress) extern __typeof (ns_name_ntop) __ns_name_ntop; diff --git a/resolv/Makefile b/resolv/Makefile index 221bdc153d..d1ad5e4cba 100644 --- a/resolv/Makefile +++ b/resolv/Makefile @@ -35,6 +35,7 @@ routines := \ inet_addr \ inet_ntop \ inet_pton \ + ns_makecanon \ ns_name_compress \ ns_name_ntop \ ns_name_pack \ @@ -151,6 +152,7 @@ libresolv-routines := \ res_mkquery \ res_query \ res_send \ + resolv-deprecated \ # libresolv-routines $(libanl-routines-var) += \ diff --git a/resolv/Versions b/resolv/Versions index fc14cdb701..93078de25c 100644 --- a/resolv/Versions +++ b/resolv/Versions @@ -72,6 +72,7 @@ libc { __inet_pton_length; __libc_dn_expand; __libc_dn_skipname; + __libc_ns_makecanon; __libc_res_dnok; __libc_res_hnok; __ns_name_compress; diff --git a/resolv/ns_makecanon.c b/resolv/ns_makecanon.c new file mode 100644 index 0000000000..a6c3c2737d --- /dev/null +++ b/resolv/ns_makecanon.c @@ -0,0 +1,50 @@ +/* Add missing "." to domain names. + * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") + * Copyright (c) 1995,1999 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 +#include +#include + +/* Make a canonical copy of domain name SRC in DST. Behavior: + foo -> foo. + foo. -> foo. + foo.. -> foo. + foo\. -> foo\.. + foo\\. -> foo\\. */ +int +__libc_ns_makecanon (const char *src, char *dst, size_t dstsize) +{ + size_t n = strlen (src); + + if (n + sizeof "." > dstsize) /* sizeof == 2. */ + { + __set_errno (EMSGSIZE); + return -1; + } + strcpy (dst, src); + while (n >= 1U && dst[n - 1] == '.') /* Ends in ".". */ + if (n >= 2U && dst[n - 2] == '\\' && /* Ends in "\.". */ + (n < 3U || dst[n - 3] != '\\')) /* But not "\\.". */ + break; + else + dst[--n] = '\0'; + dst[n++] = '.'; + dst[n] = '\0'; + return 0; +} +libc_hidden_def (__libc_ns_makecanon) diff --git a/resolv/ns_samedomain.c b/resolv/ns_samedomain.c index 5d1bf39fc7..cfff2516b0 100644 --- a/resolv/ns_samedomain.c +++ b/resolv/ns_samedomain.c @@ -143,40 +143,6 @@ ns_subdomain(const char *a, const char *b) { return (ns_samename(a, b) != 1 && ns_samedomain(a, b)); } -/*% - * make a canonical copy of domain name "src" - * - * notes: - * \code - * foo -> foo. - * foo. -> foo. - * foo.. -> foo. - * foo\. -> foo\.. - * foo\\. -> foo\\. - * \endcode - */ - -int -ns_makecanon(const char *src, char *dst, size_t dstsize) { - size_t n = strlen(src); - - if (n + sizeof "." > dstsize) { /*%< Note: sizeof == 2 */ - __set_errno (EMSGSIZE); - return (-1); - } - strcpy(dst, src); - while (n >= 1U && dst[n - 1] == '.') /*%< Ends in "." */ - if (n >= 2U && dst[n - 2] == '\\' && /*%< Ends in "\." */ - (n < 3U || dst[n - 3] != '\\')) /*%< But not "\\." */ - break; - else - dst[--n] = '\0'; - dst[n++] = '.'; - dst[n] = '\0'; - return (0); -} -libresolv_hidden_def (ns_makecanon) - /*% * determine whether domain name "a" is the same as domain name "b" * @@ -190,8 +156,8 @@ int ns_samename(const char *a, const char *b) { char ta[NS_MAXDNAME], tb[NS_MAXDNAME]; - if (ns_makecanon(a, ta, sizeof ta) < 0 || - ns_makecanon(b, tb, sizeof tb) < 0) + if (__libc_ns_makecanon(a, ta, sizeof ta) < 0 || + __libc_ns_makecanon(b, tb, sizeof tb) < 0) return (-1); if (strcasecmp(ta, tb) == 0) return (1); diff --git a/resolv/resolv-deprecated.c b/resolv/resolv-deprecated.c new file mode 100644 index 0000000000..cbd1078dc2 --- /dev/null +++ b/resolv/resolv-deprecated.c @@ -0,0 +1,35 @@ +/* Forwarders for deprecated libresolv functions which are implemented in libc. + Copyright (C) 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 + . */ + +/* Some functions are used by the stub resolver implementation + internally and thus have to be located in libc. They have been + historially exported for application use as well. However, the + stub resolver dependency on those functions is not intrinsic to + what the stub resolver does, and it is possible that a future + version of the stub resolver will not need them anymore. The + public symbols for these functions remain in libresolv, and are not + moved to libc, to avoid adding new symbol versions for legacy + functions. */ + +#include + +int +ns_makecanon (const char *src, char *dst, size_t dstsize) +{ + return __libc_ns_makecanon (src, dst, dstsize); +}