forked from rpms/glibc
97 lines
3.6 KiB
Diff
97 lines
3.6 KiB
Diff
From: Florian Weimer <fweimer@redhat.com>
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Date: Tue, 21 Jan 2020 16:25:39 +0000 (+0100)
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Subject: resolv: Enhance __resolv_conf_load to capture file change data
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X-Git-Url: https://sourceware.org/git/?p=glibc.git;a=commitdiff_plain;h=dd0b4df329ff7ff2a656404db271c8ee8379ff9d
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resolv: Enhance __resolv_conf_load to capture file change data
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The data is captured after reading the file. This allows callers
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to check the change data against an earlier measurement.
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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---
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diff --git a/resolv/res_init.c b/resolv/res_init.c
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index 09345718cd..98d84f264d 100644
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--- a/resolv/res_init.c
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+++ b/resolv/res_init.c
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@@ -103,6 +103,7 @@
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#include <inet/net-internal.h>
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#include <errno.h>
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#include <resolv_conf.h>
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+#include <file_change_detection.h>
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static uint32_t net_mask (struct in_addr);
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@@ -549,7 +550,8 @@ res_vinit_1 (FILE *fp, struct resolv_conf_parser *parser)
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}
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struct resolv_conf *
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-__resolv_conf_load (struct __res_state *preinit)
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+__resolv_conf_load (struct __res_state *preinit,
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+ struct file_change_detection *change)
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{
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/* Ensure that /etc/hosts.conf has been loaded (once). */
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_res_hconf_init ();
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@@ -577,7 +579,13 @@ __resolv_conf_load (struct __res_state *preinit)
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resolv_conf_parser_init (&parser, preinit);
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struct resolv_conf *conf = NULL;
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- if (res_vinit_1 (fp, &parser))
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+ bool ok = res_vinit_1 (fp, &parser);
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+ if (ok && change != NULL)
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+ /* Update the file change information if the configuration was
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+ loaded successfully. */
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+ ok = file_change_detection_for_fp (change, fp);
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+
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+ if (ok)
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{
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parser.template.nameserver_list
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= nameserver_list_begin (&parser.nameserver_list);
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@@ -615,7 +623,7 @@ __res_vinit (res_state statp, int preinit)
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if (preinit && has_preinit_values (statp))
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/* For the preinit case, we cannot use the cached configuration
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because some settings could be different. */
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- conf = __resolv_conf_load (statp);
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+ conf = __resolv_conf_load (statp, NULL);
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else
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conf = __resolv_conf_get_current ();
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if (conf == NULL)
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diff --git a/resolv/resolv_conf.c b/resolv/resolv_conf.c
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index d954ba9a5a..bdd2ebb909 100644
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--- a/resolv/resolv_conf.c
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+++ b/resolv/resolv_conf.c
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@@ -136,7 +136,7 @@ __resolv_conf_get_current (void)
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{
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/* Parse configuration while holding the lock. This avoids
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duplicate work. */
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- conf = __resolv_conf_load (NULL);
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+ conf = __resolv_conf_load (NULL, NULL);
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if (conf != NULL)
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{
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if (global_copy->conf_current != NULL)
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diff --git a/resolv/resolv_conf.h b/resolv/resolv_conf.h
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index 01cbff9111..101e14bfe5 100644
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--- a/resolv/resolv_conf.h
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+++ b/resolv/resolv_conf.h
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@@ -63,12 +63,16 @@ struct resolv_conf
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and the struct resolv_context facility. */
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struct __res_state;
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+struct file_change_detection;
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/* Read /etc/resolv.conf and return a configuration object, or NULL if
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/etc/resolv.conf cannot be read due to memory allocation errors.
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- If PREINIT is not NULL, some configuration values are taken from the
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- struct __res_state object. */
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-struct resolv_conf *__resolv_conf_load (struct __res_state *preinit)
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+ If PREINIT is not NULL, some configuration values are taken from
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+ the struct __res_state object. If CHANGE is not null, file change
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+ detection data is written to *CHANGE, based on the state of the
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+ file after reading it. */
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+struct resolv_conf *__resolv_conf_load (struct __res_state *preinit,
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+ struct file_change_detection *change)
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attribute_hidden __attribute__ ((warn_unused_result));
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/* Return a configuration object for the current /etc/resolv.conf
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