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resolv: Automatically reload a changed /etc/resolv.conf file [BZ #984]
This commit enhances the stub resolver to reload the configuration in the per-thread _res object if the /etc/resolv.conf file has changed. The resolver checks whether the application has modified _res and will not overwrite the _res object in that case. The struct resolv_context mechanism is used to check the configuration file only once per name lookup.
This commit is contained in:
parent
a1c4eb8794
commit
aef16cc8a4
33
ChangeLog
33
ChangeLog
@ -1,3 +1,36 @@
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2017-06-30 Florian Weimer <fweimer@redhat.com>
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[BZ #984]
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Reload /etc/resolv.conf if has been changed on disk.
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* resolv/resolv_conf.h (resolv_conf): Remove initstamp member.
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(__resolv_conf_load, __resolv_conf_get_current): Declare.
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* resolv/resolv_conf.c (struct resolv_conf_global): Add
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conf_current, conf_mtime, conf_ctime, conf_size, conf_ino members.
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(__resolv_conf_get_current): New function.
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(__resolv_conf_allocate): Do not initialize initstamp.
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(freeres): Deallocate global->conf_current.
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* resolv/resolv.h (RES_NORELOAD): Define.
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* resolv/res_debug.c (p_option): Add RES_NORELOAD.
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* resolv/resolv-internal.h (__res_initstamp): Remove declaration.
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* resolv/resolv_context.c (replicated_configuration_matches): New.
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(maybe_init): Call it. Use __resolv_conf_get_current to obtain
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the current configration.
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* resolv/res_init.c (__res_initstamp): Remove variable definition.
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(has_preinit_values): New function.
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(__resolv_conf_load): Renamed from __res_vinit. Drop res_state
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parameter and do not call __resolv_conf_attach.
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(__res_vinit): Reimplement based __resolv_conf_load.
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(res_options): Handle no-reload.
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* resolv/res_libc.c (atomicinclock, atomicincunlock, atomicinc)
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(lock): Remove.
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(res_int): Do not update __res_initstamp.
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* resolv/tst-resolv-res_init-skeleton.c (print_resp): Handle
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RES_NORELOAD.
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(test_cases): Test no-reload.
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(special_test_call_res_init): Remove.
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(special_test_callback): Rely on automated reloading. Add tests
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for no-reload.
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2017-06-30 Florian Weimer <fweimer@redhat.com>
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Mirror the entire resolver configuration in struct resolv_conf.
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4
NEWS
4
NEWS
@ -245,6 +245,10 @@ Version 2.26
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array, which is limited to six entries) will only use the first six search
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domains, as before.
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* The glibc DNS stub resolver now automatically reloads /etc/resolv.conf,
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to pick up changed configuration settings. The new “no-reload”
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(RES_NORELOAD) resolver option disables this behavior.
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Security related changes:
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* The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
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@ -613,6 +613,7 @@ p_option(u_long option) {
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case RES_SNGLKUPREOP: return "single-request-reopen";
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case RES_USE_DNSSEC: return "dnssec";
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case RES_NOTLDQUERY: return "no-tld-query";
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case RES_NORELOAD: return "no-reload";
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/* XXX nonreentrant */
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default: sprintf(nbuf, "?0x%lx?", (u_long)option);
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return (nbuf);
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@ -106,8 +106,6 @@
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static uint32_t net_mask (struct in_addr);
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unsigned long long int __res_initstamp;
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int
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res_ninit (res_state statp)
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{
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@ -164,6 +162,16 @@ struct resolv_conf_parser
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struct resolv_conf template;
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};
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/* Return true if *PREINIT contains actual preinitialization. */
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static bool
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has_preinit_values (const struct __res_state *preinit)
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{
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return (preinit->retrans != 0 && preinit->retrans != RES_TIMEOUT)
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|| (preinit->retry != 0 && preinit->retry != RES_DFLRETRY)
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|| (preinit->options != 0
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&& (preinit->options & ~RES_INIT) != RES_DEFAULT);
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}
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static void
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resolv_conf_parser_init (struct resolv_conf_parser *parser,
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const struct __res_state *preinit)
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@ -531,14 +539,8 @@ res_vinit_1 (FILE *fp, struct resolv_conf_parser *parser)
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return true;
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}
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/* Set up default settings. If the /etc/resolv.conf configuration
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file exist, the values there will have precedence. Otherwise, the
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server address is set to INADDR_LOOPBACK and the default domain
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name comes from gethostname. The RES_OPTIONS and LOCALDOMAIN
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environment variables can be used to override some settings.
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Return 0 if completes successfully, -1 on error. */
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int
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__res_vinit (res_state statp, int preinit)
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struct resolv_conf *
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__resolv_conf_load (struct __res_state *preinit)
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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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@ -559,20 +561,14 @@ __res_vinit (res_state statp, int preinit)
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default:
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/* Other errors refer to resource allocation problems and
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need to be handled by the application. */
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return -1;
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return NULL;
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}
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struct resolv_conf_parser parser;
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if (preinit)
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{
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resolv_conf_parser_init (&parser, statp);
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statp->id = res_randomid ();
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}
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else
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resolv_conf_parser_init (&parser, NULL);
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resolv_conf_parser_init (&parser, preinit);
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bool ok = res_vinit_1 (fp, &parser);
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if (ok)
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struct resolv_conf *conf = NULL;
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if (res_vinit_1 (fp, &parser))
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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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@ -583,21 +579,42 @@ __res_vinit (res_state statp, int preinit)
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= search_list_size (&parser.search_list);
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parser.template.sort_list = sort_list_begin (&parser.sort_list);
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parser.template.sort_list_size = sort_list_size (&parser.sort_list);
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struct resolv_conf *conf = __resolv_conf_allocate (&parser.template);
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if (conf == NULL)
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ok = false;
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else
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{
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ok = __resolv_conf_attach (statp, conf);
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__resolv_conf_put (conf);
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}
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conf = __resolv_conf_allocate (&parser.template);
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}
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resolv_conf_parser_free (&parser);
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if (!ok)
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return -1;
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return conf;
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}
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/* Set up default settings. If the /etc/resolv.conf configuration
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file exist, the values there will have precedence. Otherwise, the
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server address is set to INADDR_LOOPBACK and the default domain
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name comes from gethostname. The RES_OPTIONS and LOCALDOMAIN
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environment variables can be used to override some settings.
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Return 0 if completes successfully, -1 on error. */
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int
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__res_vinit (res_state statp, int preinit)
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{
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struct resolv_conf *conf;
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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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else
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return 0;
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conf = __resolv_conf_get_current ();
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if (conf == NULL)
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return -1;
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bool ok = __resolv_conf_attach (statp, conf);
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__resolv_conf_put (conf);
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if (ok)
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{
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if (preinit)
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statp->id = res_randomid ();
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return 0;
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}
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else
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return -1;
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}
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static void
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@ -652,6 +669,7 @@ res_setoptions (struct resolv_conf_parser *parser, const char *options)
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{ STRnLEN ("single-request"), 0, RES_SNGLKUP },
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{ STRnLEN ("no_tld_query"), 0, RES_NOTLDQUERY },
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{ STRnLEN ("no-tld-query"), 0, RES_NOTLDQUERY },
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{ STRnLEN ("no-reload"), 0, RES_NORELOAD },
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{ STRnLEN ("use-vc"), 0, RES_USEVC }
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};
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#define noptions (sizeof (options) / sizeof (options[0]))
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@ -42,18 +42,6 @@
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#include <libc-lock.h>
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#include <resolv-internal.h>
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/* We have atomic increment operations on 64-bit platforms. */
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#if __WORDSIZE == 64
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# define atomicinclock(lock) (void) 0
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# define atomicincunlock(lock) (void) 0
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# define atomicinc(var) catomic_increment (&(var))
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#else
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__libc_lock_define_initialized (static, lock);
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# define atomicinclock(lock) __libc_lock_lock (lock)
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# define atomicincunlock(lock) __libc_lock_unlock (lock)
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# define atomicinc(var) ++var
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#endif
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int
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res_init (void)
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{
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@ -90,12 +78,6 @@ res_init (void)
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if (!_res.id)
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_res.id = res_randomid ();
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atomicinclock (lock);
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/* Request all threads to re-initialize their resolver states,
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resolv.conf might have changed. */
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atomicinc (__res_initstamp);
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atomicincunlock (lock);
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return __res_vinit (&_res, 1);
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}
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@ -97,7 +97,4 @@ int __res_nopt (struct resolv_context *, int n0,
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int __inet_pton_length (int af, const char *src, size_t srclen, void *);
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libc_hidden_proto (__inet_pton_length)
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/* Used to propagate the effect of res_init calls across threads. */
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extern unsigned long long int __res_initstamp attribute_hidden;
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#endif /* _RESOLV_INTERNAL_H */
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@ -134,6 +134,7 @@ struct res_sym {
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#define RES_USE_DNSSEC 0x00800000 /* use DNSSEC using OK bit in OPT */
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#define RES_NOTLDQUERY 0x01000000 /* Do not look up unqualified name
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as a TLD. */
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#define RES_NORELOAD 0x02000000 /* No automatic configuration reload. */
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#define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH)
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@ -22,6 +22,7 @@
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#include <assert.h>
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#include <libc-lock.h>
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#include <resolv-internal.h>
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#include <sys/stat.h>
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/* _res._u._ext.__glibc_extension_index is used as an index into a
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struct resolv_conf_array object. The intent of this construction
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@ -54,6 +55,15 @@ struct resolv_conf_global
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the array element is overwritten with NULL. */
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struct resolv_conf_array array;
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/* Cached current configuration object for /etc/resolv.conf. */
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struct resolv_conf *conf_current;
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/* These properties of /etc/resolv.conf are used to check if the
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configuration needs reloading. */
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struct timespec conf_mtime;
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struct timespec conf_ctime;
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off64_t conf_size;
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ino64_t conf_ino;
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};
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/* Lazily allocated storage for struct resolv_conf_global. */
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@ -100,6 +110,75 @@ conf_decrement (struct resolv_conf *conf)
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free (conf);
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}
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struct resolv_conf *
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__resolv_conf_get_current (void)
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{
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struct stat64 st;
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if (stat64 (_PATH_RESCONF, &st) != 0)
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{
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switch (errno)
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{
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case EACCES:
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case EISDIR:
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case ELOOP:
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case ENOENT:
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case ENOTDIR:
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case EPERM:
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/* Ignore errors due to file system contents. */
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memset (&st, 0, sizeof (st));
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break;
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default:
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/* Other errors are fatal. */
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return NULL;
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}
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}
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struct resolv_conf_global *global_copy = get_locked_global ();
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if (global_copy == NULL)
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return NULL;
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struct resolv_conf *conf;
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if (global_copy->conf_current != NULL
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&& (global_copy->conf_mtime.tv_sec == st.st_mtim.tv_sec
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&& global_copy->conf_mtime.tv_nsec == st.st_mtim.tv_nsec
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&& global_copy->conf_ctime.tv_sec == st.st_ctim.tv_sec
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&& global_copy->conf_ctime.tv_nsec == st.st_ctim.tv_nsec
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&& global_copy->conf_ino == st.st_ino
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&& global_copy->conf_size == st.st_size))
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/* We can reuse the cached configuration object. */
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conf = global_copy->conf_current;
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else
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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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if (conf != NULL)
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{
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if (global_copy->conf_current != NULL)
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conf_decrement (global_copy->conf_current);
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global_copy->conf_current = conf; /* Takes ownership. */
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/* Update file modification stamps. The configuration we
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read could be a newer version of the file, but this does
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not matter because this will lead to an extraneous reload
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later. */
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global_copy->conf_mtime = st.st_mtim;
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global_copy->conf_ctime = st.st_ctim;
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global_copy->conf_ino = st.st_ino;
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global_copy->conf_size = st.st_size;
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}
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}
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if (conf != NULL)
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{
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/* Return an additional reference. */
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assert (conf->__refcount > 0);
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++conf->__refcount;
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assert (conf->__refcount > 0);
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}
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put_locked_global (global_copy);
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return conf;
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}
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/* Internal implementation of __resolv_conf_get, without validation
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against *RESP. */
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static struct resolv_conf *
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@ -320,7 +399,6 @@ __resolv_conf_allocate (const struct resolv_conf *init)
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conf->retry = init->retry;
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conf->options = init->options;
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conf->ndots = init->ndots;
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conf->initstamp = __res_initstamp;
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/* Allocate the arrays with pointers. These must come first because
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they have the highets alignment. */
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@ -580,6 +658,12 @@ freeres (void)
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if (global == NULL)
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return;
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if (global->conf_current != NULL)
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{
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conf_decrement (global->conf_current);
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global->conf_current = NULL;
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}
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/* Note that this frees only the array itself. The pointed-to
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configuration objects should have been deallocated by res_nclose
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and per-thread cleanup functions. */
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@ -35,11 +35,6 @@ struct resolv_sortlist_entry
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object. */
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struct resolv_conf
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{
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/* Used to propagate the effect of res_init across threads. This
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member is mutable and prevents sharing of the same struct
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resolv_conf object among multiple struct __res_state objects. */
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unsigned long long int initstamp;
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/* Reference counter. The object is deallocated once it reaches
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zero. For internal use within resolv_conf only. */
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size_t __refcount;
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@ -69,6 +64,18 @@ struct resolv_conf
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struct __res_state;
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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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attribute_hidden __attribute__ ((warn_unused_result));
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/* Return a configuration object for the current /etc/resolv.conf
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settings, or NULL on failure. The object is cached. */
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struct resolv_conf *__resolv_conf_get_current (void)
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attribute_hidden __attribute__ ((warn_unused_result));
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/* Return the extended resolver state for *RESP, or NULL if it cannot
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be determined. A call to this function must be paired with a call
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to __resolv_conf_put. */
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@ -51,6 +51,20 @@
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resolver state. */
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static __thread struct resolv_context *current attribute_tls_model_ie;
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/* The resolv_conf handling will gives us a ctx->conf pointer even if
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these fields do not match because a mis-match does not cause a loss
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of state (_res objects can store the full information). This
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function checks to ensure that there is a full patch, to prevent
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overwriting a patched configuration. */
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static bool
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replicated_configuration_matches (const struct resolv_context *ctx)
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{
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return ctx->resp->options == ctx->conf->options
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&& ctx->resp->retrans == ctx->conf->retrans
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&& ctx->resp->retry == ctx->conf->retry
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&& ctx->resp->ndots == ctx->conf->ndots;
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}
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/* Initialize *RESP if RES_INIT is not yet set in RESP->options, or if
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res_init in some other thread requested re-initializing. */
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static __attribute__ ((warn_unused_result)) bool
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@ -59,27 +73,36 @@ maybe_init (struct resolv_context *ctx, bool preinit)
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struct __res_state *resp = ctx->resp;
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if (resp->options & RES_INIT)
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{
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if (resp->options & RES_NORELOAD)
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/* Configuration reloading was explicitly disabled. */
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return true;
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/* If there is no associated resolv_conf object despite the
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initialization, something modified *ctx->resp. Do not
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override those changes. */
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if (ctx->conf != NULL && ctx->conf->initstamp != __res_initstamp)
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if (ctx->conf != NULL && replicated_configuration_matches (ctx))
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{
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if (resp->nscount > 0)
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/* This call will detach the extended resolver state. */
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__res_iclose (resp, true);
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/* And this call will attach it again. */
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if (__res_vinit (resp, 1) < 0)
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struct resolv_conf *current = __resolv_conf_get_current ();
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if (current == NULL)
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return false;
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|
||||
/* Check if the configuration changed. */
|
||||
if (current != ctx->conf)
|
||||
{
|
||||
/* The configuration no longer matches after failed
|
||||
initialization. */
|
||||
__resolv_conf_put (ctx->conf);
|
||||
ctx->conf = NULL;
|
||||
return false;
|
||||
/* This call will detach the extended resolver state. */
|
||||
if (resp->nscount > 0)
|
||||
__res_iclose (resp, true);
|
||||
/* Reattach the current configuration. */
|
||||
if (__resolv_conf_attach (ctx->resp, current))
|
||||
{
|
||||
__resolv_conf_put (ctx->conf);
|
||||
/* ctx takes ownership, so we do not release current. */
|
||||
ctx->conf = current;
|
||||
}
|
||||
}
|
||||
/* Delay the release of the old configuration until this
|
||||
point, so that __res_vinit can reuse it if possible. */
|
||||
__resolv_conf_put (ctx->conf);
|
||||
ctx->conf = __resolv_conf_get (ctx->resp);
|
||||
else
|
||||
/* No change. Drop the reference count for current. */
|
||||
__resolv_conf_put (current);
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
@ -151,6 +151,7 @@ print_resp (FILE *fp, res_state resp)
|
||||
print_option_flag (fp, &options, RES_SNGLKUPREOP,
|
||||
"single-request-reopen");
|
||||
print_option_flag (fp, &options, RES_NOTLDQUERY, "no-tld-query");
|
||||
print_option_flag (fp, &options, RES_NORELOAD, "no-reload");
|
||||
fputc ('\n', fp);
|
||||
if (options != 0)
|
||||
fprintf (fp, "; error: unresolved option bits: 0x%x\n", options);
|
||||
@ -470,6 +471,28 @@ struct test_case test_cases[] =
|
||||
"nameserver 192.0.2.1\n"
|
||||
"; nameserver[0]: [192.0.2.1]:53\n"
|
||||
},
|
||||
{.name = "basic no-reload",
|
||||
.conf = "options no-reload\n"
|
||||
"search corp.example.com example.com\n"
|
||||
"nameserver 192.0.2.1\n",
|
||||
.expected = "options no-reload\n"
|
||||
"search corp.example.com example.com\n"
|
||||
"; search[0]: corp.example.com\n"
|
||||
"; search[1]: example.com\n"
|
||||
"nameserver 192.0.2.1\n"
|
||||
"; nameserver[0]: [192.0.2.1]:53\n"
|
||||
},
|
||||
{.name = "basic no-reload via RES_OPTIONS",
|
||||
.conf = "search corp.example.com example.com\n"
|
||||
"nameserver 192.0.2.1\n",
|
||||
.expected = "options no-reload\n"
|
||||
"search corp.example.com example.com\n"
|
||||
"; search[0]: corp.example.com\n"
|
||||
"; search[1]: example.com\n"
|
||||
"nameserver 192.0.2.1\n"
|
||||
"; nameserver[0]: [192.0.2.1]:53\n",
|
||||
.res_options = "no-reload"
|
||||
},
|
||||
{.name = "whitespace",
|
||||
.conf = "# This test covers comment and whitespace processing "
|
||||
" (trailing whitespace,\n"
|
||||
@ -722,18 +745,7 @@ test_file_contents (const struct test_case *t)
|
||||
}
|
||||
|
||||
/* Special tests which do not follow the general pattern. */
|
||||
enum { special_tests_count = 7 };
|
||||
|
||||
#if TEST_THREAD
|
||||
/* Called from test number 3-6 to trigger reloading of the
|
||||
configuration. */
|
||||
static void *
|
||||
special_test_call_res_init (void *closure)
|
||||
{
|
||||
TEST_VERIFY (res_init () == 0);
|
||||
return NULL;
|
||||
}
|
||||
#endif
|
||||
enum { special_tests_count = 11 };
|
||||
|
||||
/* Implementation of special tests. */
|
||||
static void
|
||||
@ -800,20 +812,29 @@ special_test_callback (void *closure)
|
||||
case 4:
|
||||
case 5:
|
||||
case 6:
|
||||
/* Test res_init change broadcast. This requires a second
|
||||
thread to trigger the reload. */
|
||||
#if TEST_THREAD
|
||||
support_write_file_string (_PATH_RESCONF,
|
||||
"options edns0\n"
|
||||
"nameserver 192.0.2.1\n");
|
||||
goto reload_tests;
|
||||
case 7: /* 7 and the following tests are with no-reload. */
|
||||
case 8:
|
||||
case 9:
|
||||
case 10:
|
||||
support_write_file_string (_PATH_RESCONF,
|
||||
"options edns0 no-reload\n"
|
||||
"nameserver 192.0.2.1\n");
|
||||
/* Fall through. */
|
||||
reload_tests:
|
||||
for (int iteration = 0; iteration < 2; ++iteration)
|
||||
{
|
||||
switch (test_index)
|
||||
{
|
||||
case 3:
|
||||
case 7:
|
||||
TEST_VERIFY (res_init () == 0);
|
||||
break;
|
||||
case 4:
|
||||
case 8:
|
||||
{
|
||||
unsigned char buf[512];
|
||||
TEST_VERIFY
|
||||
@ -822,37 +843,44 @@ special_test_callback (void *closure)
|
||||
}
|
||||
break;
|
||||
case 5:
|
||||
case 9:
|
||||
gethostbyname (test_hostname);
|
||||
break;
|
||||
case 6:
|
||||
case 10:
|
||||
{
|
||||
struct addrinfo *ai;
|
||||
(void) getaddrinfo (test_hostname, NULL, NULL, &ai);
|
||||
}
|
||||
break;
|
||||
}
|
||||
if (iteration == 0)
|
||||
/* test_index == 7 is res_init and performs a reload even
|
||||
with no-reload. */
|
||||
if (iteration == 0 || test_index > 7)
|
||||
{
|
||||
TEST_VERIFY (_res.options & RES_USE_EDNS0);
|
||||
TEST_VERIFY (!(_res.options & RES_ROTATE));
|
||||
if (test_index < 7)
|
||||
TEST_VERIFY (!(_res.options & RES_NORELOAD));
|
||||
else
|
||||
TEST_VERIFY (_res.options & RES_NORELOAD);
|
||||
TEST_VERIFY (_res.nscount == 1);
|
||||
/* File change triggers automatic reloading. */
|
||||
support_write_file_string (_PATH_RESCONF,
|
||||
"options rotate\n"
|
||||
"nameserver 192.0.2.1\n"
|
||||
"nameserver 192.0.2.2\n");
|
||||
xpthread_join (xpthread_create
|
||||
(NULL, special_test_call_res_init, NULL));
|
||||
}
|
||||
else
|
||||
{
|
||||
/* edns0 was dropped, but the flag is not cleared. See
|
||||
bug 21701. */
|
||||
/* TEST_VERIFY (!(_res.options & RES_USE_EDNS0)); */
|
||||
if (test_index != 3 && test_index != 7)
|
||||
/* test_index 3, 7 are res_init; this function does
|
||||
not reset flags. See bug 21701. */
|
||||
TEST_VERIFY (!(_res.options & RES_USE_EDNS0));
|
||||
TEST_VERIFY (_res.options & RES_ROTATE);
|
||||
TEST_VERIFY (_res.nscount == 2);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user