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hesiod: Always use thread-local resolver state [BZ #19573]
The Hesiod implementation imported into glibc was enhanced to support caller-supplied resolver states. But its only consumer is nss_hesiod, and it supplies the thread-local resolver state. Therefore, this commit changes the Hesiod implementation to use the thread-local resolver state (_res) directly. This fixes bug 19573 because the Hesiod implementation no longer has to initialize and free any resolver state. To avoid any risk of interposition of ABI-incompatible Hesiod function implementations, this commit marks the Hesiod functions as hidden. (They were already hidden using a linker version script.)
This commit is contained in:
Florian Weimer
parent
46cb402c6d
commit
5018f16c62
25
ChangeLog
25
ChangeLog
@ -1,3 +1,28 @@
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2016-05-02 Florian Weimer <fweimer@redhat.com>
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[BZ #19573]
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* hesiod/Makefile (libnss_hesiod-routines): Remove hesiod-init.
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* hesiod/nss_hesiod/hesiod-init.c: Remove file.
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* hesiod/nss_hesiod/nss_hesiod.h: Likewise.
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* hesiod/hesiod.h (__hesiod_res_get, __hesiod_res_set): Remove.
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(hesiod_init, hesiod_end, hesiod_to_bind, hesiod_resolve)
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(hesiod_free_list): Mark as hidden.
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* hesiod/hesiod_p (struct hesiod_p): Remove res, free_res,
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res_set, res_get.
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* hesiod/hesiod.c: Remove unnecessary forward declarations.
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(init, __hesiod_res_get, __hesiod_res_set): Remove.
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(hesiod_init): Remove obsolete res_ninit call.
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(hesiod_end): Do not free resolver state. Do not invoke callback.
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(hesiod_bind): Do not call init.
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(get_txt_records): Use res_mkquery, res_send instead of
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res_nmkquery, res_nsend.
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* hesiod/nss_hesiod/hesiod-grp.c (lookup): Call hesiod_init
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instead of _nss_hesiod_init.
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(_nss_hesiod_initgroups_dyn): Likewise.
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* hesiod/nss_hesiod/hesiod-proto.c (lookup): Likewise.
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* hesiod/nss_hesiod/hesiod-pwd.c (lookup): Likewise.
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* hesiod/nss_hesiod/hesiod-service.c (lookup): Likewise.
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2016-05-02 Florian Weimer <fweimer@redhat.com>
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* hesiod/hesiod_p.h (DEF_RHS): Remove.
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@ -28,7 +28,7 @@ extra-libs-others = $(extra-libs)
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subdir-dirs = nss_hesiod
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vpath %.c nss_hesiod
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libnss_hesiod-routines := hesiod hesiod-grp hesiod-init hesiod-proto \
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libnss_hesiod-routines := hesiod hesiod-grp hesiod-proto \
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hesiod-pwd hesiod-service
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# Build only shared library
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libnss_hesiod-inhibit-o = $(filter-out .os,$(object-suffixes))
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@ -1,3 +1,20 @@
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/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/*
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* Copyright (c) 1996,1999 by Internet Software Consortium.
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*
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@ -47,18 +64,9 @@
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/* Forward */
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int hesiod_init(void **context);
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void hesiod_end(void *context);
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char * hesiod_to_bind(void *context, const char *name,
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const char *type);
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char ** hesiod_resolve(void *context, const char *name,
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const char *type);
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void hesiod_free_list(void *context, char **list);
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static int parse_config_file(struct hesiod_p *ctx, const char *filename);
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static char ** get_txt_records(struct hesiod_p *ctx, int class,
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const char *name);
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static int init(struct hesiod_p *ctx);
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/* Public */
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@ -77,7 +85,6 @@ hesiod_init(void **context) {
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ctx->LHS = NULL;
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ctx->RHS = NULL;
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ctx->res = NULL;
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/* Set default query classes. */
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ctx->classes[0] = C_IN;
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ctx->classes[1] = C_HS;
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@ -114,11 +121,6 @@ hesiod_init(void **context) {
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goto cleanup;
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}
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#if 0
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if (res_ninit(ctx->res) < 0)
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goto cleanup;
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#endif
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*context = ctx;
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return (0);
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@ -135,12 +137,8 @@ hesiod_end(void *context) {
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struct hesiod_p *ctx = (struct hesiod_p *) context;
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int save_errno = errno;
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if (ctx->res)
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res_nclose(ctx->res);
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free(ctx->RHS);
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free(ctx->LHS);
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if (ctx->res && ctx->free_res)
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(*ctx->free_res)(ctx->res);
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free(ctx);
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__set_errno(save_errno);
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}
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@ -215,10 +213,6 @@ hesiod_resolve(void *context, const char *name, const char *type) {
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if (bindname == NULL)
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return (NULL);
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if (init(ctx) == -1) {
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free(bindname);
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return (NULL);
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}
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retvec = get_txt_records(ctx, ctx->classes[0], bindname);
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@ -348,13 +342,13 @@ get_txt_records(struct hesiod_p *ctx, int class, const char *name) {
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/*
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* Construct the query and send it.
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*/
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n = res_nmkquery(ctx->res, QUERY, name, class, T_TXT, NULL, 0,
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n = res_mkquery(QUERY, name, class, T_TXT, NULL, 0,
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NULL, qbuf, MAX_HESRESP);
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if (n < 0) {
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__set_errno(EMSGSIZE);
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return (NULL);
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}
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n = res_nsend(ctx->res, qbuf, n, abuf, MAX_HESRESP);
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n = res_send(qbuf, n, abuf, MAX_HESRESP);
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if (n < 0) {
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__set_errno(ECONNREFUSED);
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return (NULL);
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@ -447,44 +441,3 @@ get_txt_records(struct hesiod_p *ctx, int class, const char *name) {
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free(list);
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return (NULL);
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}
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struct __res_state *
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__hesiod_res_get(void *context) {
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struct hesiod_p *ctx = context;
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if (!ctx->res) {
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struct __res_state *res;
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res = (struct __res_state *)calloc(1, sizeof *res);
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if (res == NULL)
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return (NULL);
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__hesiod_res_set(ctx, res, free);
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}
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return (ctx->res);
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}
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void
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__hesiod_res_set(void *context, struct __res_state *res,
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void (*free_res)(void *)) {
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struct hesiod_p *ctx = context;
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if (ctx->res && ctx->free_res) {
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res_nclose(ctx->res);
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(*ctx->free_res)(ctx->res);
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}
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ctx->res = res;
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ctx->free_res = free_res;
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}
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static int
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init(struct hesiod_p *ctx) {
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if (!ctx->res && !__hesiod_res_get(ctx))
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return (-1);
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if (__res_maybe_init (ctx->res, 0) == -1)
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return (-1);
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return (0);
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}
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@ -1,3 +1,20 @@
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/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/*
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* Copyright (c) 1996,1999 by Internet Software Consortium.
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*
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@ -22,15 +39,12 @@
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#ifndef _HESIOD_H_INCLUDED
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#define _HESIOD_H_INCLUDED
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int hesiod_init (void **context);
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void hesiod_end (void *context);
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int hesiod_init (void **context) attribute_hidden;
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void hesiod_end (void *context) attribute_hidden;
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char * hesiod_to_bind (void *context, const char *name,
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const char *type);
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const char *type) attribute_hidden;
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char ** hesiod_resolve (void *context, const char *name,
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const char *type);
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void hesiod_free_list (void *context, char **list);
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struct __res_state * __hesiod_res_get (void *context);
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void __hesiod_res_set (void *context, struct __res_state *,
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void (*)(void *));
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const char *type) attribute_hidden;
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void hesiod_free_list (void *context, char **list) attribute_hidden;
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#endif /*_HESIOD_H_INCLUDED*/
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@ -1,3 +1,20 @@
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/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/*
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* Copyright (c) 1996,1999 by Internet Software Consortium.
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*
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@ -31,11 +48,6 @@
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struct hesiod_p {
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char * LHS; /* normally ".ns" */
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char * RHS; /* AKA the default hesiod domain */
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struct __res_state * res; /* resolver context */
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void (*free_res)(void *);
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void (*res_set)(struct hesiod_p *, struct __res_state *,
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void (*)(void *));
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struct __res_state * (*res_get)(struct hesiod_p *);
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int classes[2]; /* The class search order. */
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};
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@ -26,8 +26,6 @@
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#include <string.h>
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#include <sys/param.h>
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#include "nss_hesiod.h"
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/* Get the declaration of the parser function. */
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#define ENTNAME grent
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#define STRUCTURE group
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@ -58,8 +56,7 @@ lookup (const char *name, const char *type, struct group *grp,
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size_t len;
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int olderr = errno;
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context = _nss_hesiod_init ();
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if (context == NULL)
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if (hesiod_init (&context) < 0)
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return NSS_STATUS_UNAVAIL;
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list = hesiod_resolve (context, name, type);
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@ -179,8 +176,7 @@ _nss_hesiod_initgroups_dyn (const char *user, gid_t group, long int *start,
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gid_t *groups = *groupsp;
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int save_errno;
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context = _nss_hesiod_init ();
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if (context == NULL)
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if (hesiod_init (&context) < 0)
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return NSS_STATUS_UNAVAIL;
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list = hesiod_resolve (context, user, "grplist");
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@ -1,38 +0,0 @@
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/* Copyright (C) 2000-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 2000.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sys/cdefs.h> /* Needs to come before <hesiod.h>. */
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#include <hesiod.h>
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#include <resolv.h>
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#include <stddef.h>
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#include "nss_hesiod.h"
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void *
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_nss_hesiod_init (void)
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{
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void *context;
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if (hesiod_init (&context) == -1)
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return NULL;
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/* Use the default (per-thread) resolver state. */
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__hesiod_res_set (context, &_res, NULL);
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return context;
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}
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@ -25,8 +25,6 @@
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#include <stdlib.h>
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#include <string.h>
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#include "nss_hesiod.h"
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/* Declare a parser for Hesiod protocol entries. Although the format
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of the entries is identical to those in /etc/protocols, here is no
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predefined parser for us to use. */
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@ -68,8 +66,7 @@ lookup (const char *name, const char *type, struct protoent *proto,
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int found;
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int olderr = errno;
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context = _nss_hesiod_init ();
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if (context == NULL)
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if (hesiod_init (&context) < 0)
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return NSS_STATUS_UNAVAIL;
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list = hesiod_resolve (context, name, type);
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@ -24,8 +24,6 @@
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#include <stdlib.h>
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#include <string.h>
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#include "nss_hesiod.h"
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/* Get the declaration of the parser function. */
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#define ENTNAME pwent
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#define STRUCTURE passwd
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@ -56,8 +54,7 @@ lookup (const char *name, const char *type, struct passwd *pwd,
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size_t len;
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int olderr = errno;
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context = _nss_hesiod_init ();
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if (context == NULL)
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if (hesiod_init (&context) < 0)
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return NSS_STATUS_UNAVAIL;
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list = hesiod_resolve (context, name, type);
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@ -25,8 +25,6 @@
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#include <stdlib.h>
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#include <string.h>
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#include "nss_hesiod.h"
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/* Hesiod uses a format for service entries that differs from the
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traditional format. We therefore declare our own parser. */
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@ -69,8 +67,7 @@ lookup (const char *name, const char *type, const char *protocol,
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int found;
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int olderr = errno;
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context = _nss_hesiod_init ();
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if (context == NULL)
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if (hesiod_init (&context) < 0)
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return NSS_STATUS_UNAVAIL;
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list = hesiod_resolve (context, name, type);
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@ -1,20 +0,0 @@
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/* Copyright (C) 2000-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 2000.
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|
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The GNU C Library is free software; you can redistribute it and/or
|
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modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
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version 2.1 of the License, or (at your option) any later version.
|
||||
|
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The GNU C Library is distributed in the hope that it will be useful,
|
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
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You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
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<http://www.gnu.org/licenses/>. */
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/* Initialize a Hesiod context. */
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extern void *_nss_hesiod_init (void);
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