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copying cups-resolv_reload.patch from RHEL

This commit is contained in:
Zdenek Dohnal 2017-04-27 10:44:02 +02:00
parent 2b168451b0
commit f8a15d6ee4
2 changed files with 171 additions and 86 deletions
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252
cups-resolv_reload.patch
View File

@ -1,7 +1,7 @@
diff -up cups-2.1.4/cups/auth.c.resolv_reload cups-2.1.4/cups/auth.c
--- cups-2.1.4/cups/auth.c.resolv_reload 2016-06-14 19:45:32.000000000 +0200
+++ cups-2.1.4/cups/auth.c 2017-04-05 17:36:21.812611389 +0200
@@ -522,6 +522,16 @@ cups_gss_getname(
+++ cups-2.1.4/cups/auth.c 2017-04-27 10:31:13.430082002 +0200
@@ -522,6 +522,18 @@ cups_gss_getname(
DEBUG_printf(("7cups_gss_getname(http=%p, service_name=\"%s\")", http,
service_name));
@ -11,17 +11,19 @@ diff -up cups-2.1.4/cups/auth.c.resolv_reload cups-2.1.4/cups/auth.c
+ * If so, reload resolver.
+ */
+
+ http_resolv_check_t status;
+ dns_resolver_reload_rv retval;
+
+ status = httpCheckResolv();
+ retval = dnsReloadResolver();
+ if (retval.status == DNS_RESOLVER_RELOAD_ERROR)
+ DEBUG_printf(("1cups_gss_getname: dnsReloadResolver() failed - %s.", strerror(retval.errnum)));
+#endif /* HAVE_RES_INIT */
/*
* Get the hostname...
diff -up cups-2.1.4/cups/http-addr.c.resolv_reload cups-2.1.4/cups/http-addr.c
--- cups-2.1.4/cups/http-addr.c.resolv_reload 2017-04-05 17:36:21.798611527 +0200
+++ cups-2.1.4/cups/http-addr.c 2017-04-05 17:36:21.812611389 +0200
@@ -364,6 +364,17 @@ httpAddrLookup(
--- cups-2.1.4/cups/http-addr.c.resolv_reload 2017-04-27 10:31:13.415082133 +0200
+++ cups-2.1.4/cups/http-addr.c 2017-04-27 10:31:13.431081993 +0200
@@ -364,6 +364,20 @@ httpAddrLookup(
#ifdef HAVE_RES_INIT
/*
@ -29,20 +31,23 @@ diff -up cups-2.1.4/cups/http-addr.c.resolv_reload cups-2.1.4/cups/http-addr.c
+ * If so, reload resolver and set need_res_init to 0.
+ */
+
+ http_resolv_check_t status;
+ dns_resolver_reload_rv retval;
+
+ status = httpCheckResolv();
+ retval = dnsReloadResolver();
+
+ if (status == HTTP_RESOLV_CHECK_RELOADED && cg->need_res_init == 1)
+ if (retval.status == DNS_RESOLVER_RELOAD_RELOADED && cg->need_res_init == 1)
+ cg->need_res_init = 0;
+
+ if (retval.status == DNS_RESOLVER_RELOAD_ERROR)
+ DEBUG_printf(("1httpAddrLookup: dnsReloadResolver() failed - %s.", strerror(retval.errnum)));
+ /*
* STR #2920: Initialize resolver after failure in cups-polld
*
* If the previous lookup failed, re-initialize the resolver to prevent
diff -up cups-2.1.4/cups/http-addrlist.c.resolv_reload cups-2.1.4/cups/http-addrlist.c
--- cups-2.1.4/cups/http-addrlist.c.resolv_reload 2017-04-05 17:36:21.781611694 +0200
+++ cups-2.1.4/cups/http-addrlist.c 2017-04-05 17:36:21.813611379 +0200
@@ -414,6 +414,17 @@ httpAddrGetList(const char *hostname, /*
--- cups-2.1.4/cups/http-addrlist.c.resolv_reload 2017-04-27 10:31:13.400082264 +0200
+++ cups-2.1.4/cups/http-addrlist.c 2017-04-27 10:31:13.431081993 +0200
@@ -414,6 +414,20 @@ httpAddrGetList(const char *hostname, /*
#ifdef HAVE_RES_INIT
/*
@ -50,78 +55,136 @@ diff -up cups-2.1.4/cups/http-addrlist.c.resolv_reload cups-2.1.4/cups/http-addr
+ * If so, reload resolver and set cg->need_res_init to 0
+ */
+
+ http_resolv_check_t status;
+ dns_resolver_reload_rv retval;
+
+ status = httpCheckResolv();
+ retval = dnsReloadResolver();
+
+ if (status == HTTP_RESOLV_CHECK_RELOADED && cg->need_res_init == 1)
+ if (retval.status == DNS_RESOLVER_RELOAD_RELOADED && cg->need_res_init == 1)
+ cg->need_res_init = 0;
+
+ if (retval.status == DNS_RESOLVER_RELOAD_ERROR)
+ DEBUG_printf(("1httpAddrGetList: dnsReloadResolver() failed - %s.", strerror(retval.errnum)));
+ /*
* STR #2920: Initialize resolver after failure in cups-polld
*
* If the previous lookup failed, re-initialize the resolver to prevent
diff -up cups-2.1.4/cups/http.c.resolv_reload cups-2.1.4/cups/http.c
--- cups-2.1.4/cups/http.c.resolv_reload 2016-06-14 19:45:32.000000000 +0200
+++ cups-2.1.4/cups/http.c 2017-04-05 17:53:16.856712660 +0200
@@ -109,6 +109,9 @@ static const char * const http_fields[]
"Allow",
"Server"
};
+#ifdef HAVE_RES_INIT
+time_t resolv_conf_modtime = 0;
+#endif /* HAVE_RES_INIT */
/*
@@ -4848,6 +4851,45 @@ http_write_chunk(http_t *http, /* I
return (bytes);
--- cups-2.1.4/cups/http.c.resolv_reload 2017-04-27 10:31:13.433081976 +0200
+++ cups-2.1.4/cups/http.c 2017-04-27 10:32:39.450330261 +0200
@@ -4849,6 +4849,110 @@ http_write_chunk(http_t *http, /* I
}
+#ifdef HAVE_RES_INIT
+/*
+ * Function to check modification time of resolv.conf.
+ * If time is changed, it reloads resolver.
+ * If /etc/resolv.conf doesn't exist, it tries to reload local resolver.
+ * If even reloading local resolver doesn't work, it ends with error.
+ * If /etc/resolv.conf doesn't exist, it tries to reload resolver with local nameserver, if it wasn't reloaded before
+ * If even reloading resolver with local nameserver doesn't work, it ends with error.
+ * Global variable resolv_conf_modtime is set to -1 before the first call of this function - this is for prevention of resolver's reloading when cupsd is just started and resolv.conf exists - cupsd has current configuration in that case.
+ */
+
+http_resolv_check_t
+httpCheckResolv()
+dns_resolver_reload_rv
+dnsReloadResolver()
+{
+ http_resolv_check_t status = HTTP_RESOLV_CHECK_OK;
+ struct stat resolv_conf_status;
+ dns_resolver_reload_rv retval, lstat_retval, stat_retval, res_init_retval;
+ struct stat resolv_conf_stat, resolv_conf_lstat, resolv_conf_status;
+ retval.status = DNS_RESOLVER_RELOAD_OK;
+ retval.errnum = 0;
+ stat_retval.errnum = 0;
+ lstat_retval.errnum = 0;
+ res_init_retval.errnum = 0;
+
+ status = stat(HTTP_RESOLV_CONF_PATH, &resolv_conf_status);
+ /* Variable to store /etc/resolv.conf modification time - initialized by actual time*/
+ static time_t resolv_conf_modtime = -1;
+
+ /* /etc/resolv.conf couldn't be stated because it doesn't exist, try resolver on localhost */
+ if (status == HTTP_RESOLV_CHECK_ERROR && errno == ENOENT)
+ /* This part of code is to ensure we get modification time of symlink and original file - we will decide which is newer later */
+ stat_retval.status = stat(DNS_RESOLV_CONF_PATH, &resolv_conf_stat);
+ stat_retval.errnum = errno;
+ lstat_retval.status = lstat(DNS_RESOLV_CONF_PATH, &resolv_conf_lstat);
+ lstat_retval.errnum = errno;
+
+ /* symlink /etc/resolv.conf or original file couldn't be stated because it doesn't exist, try resolver on localhost
+ * Covers cases:
+ * - resolv.conf and original file existed and it doesn't now - resolv_conf_modtime has different value than 0 - reload resolver with local nameserver
+ * - resolv.conf and original file didn't exist and still doesn't exist - resolv_conf_modtime is set to 0 - do nothing
+ */
+ if (stat_retval.status == -1 && lstat_retval.status == -1 && stat_retval.errnum == ENOENT && lstat_retval.errnum == ENOENT)
+ {
+ status = res_init();
+ return(status);
+ /* if resolv_conf_modtime is set to 0, it means previous reload was for resolver with local nameserver - no need to reload again */
+ if (resolv_conf_modtime != 0)
+ {
+ res_init_retval.status = res_init();
+ res_init_retval.errnum = errno;
+ if (res_init_retval.status == 0)
+ {
+ resolv_conf_modtime = 0;
+ retval.status = DNS_RESOLVER_RELOAD_RELOADED;
+ }
+ else
+ retval.status = res_init_retval.status;
+
+ retval.errnum = res_init_retval.errnum;
+ }
+ else
+ {
+ retval.status = DNS_RESOLVER_RELOAD_OK;
+ retval.errnum = ENOENT;
+ }
+
+ return (retval);
+ }
+
+ /* If stat ends with different errno, return status */
+ if (status == HTTP_RESOLV_CHECK_ERROR)
+ return (status);
+
+ if (resolv_conf_modtime != 0 && resolv_conf_status.st_mtime != resolv_conf_modtime)
+ /* If stat ends with different errno, return status - it should return both statuses and errnos, but for simplification it returns only stat */
+ if (stat_retval.status == -1 && lstat_retval.status == -1)
+ {
+ res_init();
+ retval.errnum = stat_retval.errnum;
+ retval.status = stat_retval.status;
+ return (retval);
+ }
+
+ status = HTTP_RESOLV_CHECK_RELOADED;
+ /* Here we compare modification times from lstat and stat to decide which is newer - if they are equal, lstat modification time is used. We are checking only stat() errno, because case with errors in both lstat() and stat() functions is checked before */
+ if (stat_retval.errnum == 0)
+ if (resolv_conf_stat.st_mtime > resolv_conf_lstat.st_mtime)
+ resolv_conf_status = resolv_conf_stat;
+ else
+ resolv_conf_status = resolv_conf_lstat;
+ else
+ resolv_conf_status = resolv_conf_lstat;
+
+ /* If /etc/resolv.conf exists and modification times are different, reload resolver.
+ * Covers cases:
+ * - resolv.conf or original file exists and it was modified - resolv_conf_modtime has different value than resolv_conf_status.st_mtime - reload resolver with nameserver from /etc/resolv.conf
+ * - resolv.conf or original file didn't exist and it does now - resolv_conf_modtime is set to 0 and resolv_conf_status.st_mtime has value - reload resolver with nameserver form /etc/resolv.conf
+ * - resolv.conf or original file exists and it wasn't modified - resolv_conf_modtime is equal to resolv_conf_status.st_mtime - do nothing
+ */
+ if (resolv_conf_status.st_mtime != resolv_conf_modtime)
+ {
+ res_init_retval.status = res_init();
+ res_init_retval.errnum = errno;
+ if (res_init_retval.status == 0)
+ {
+ retval.status = DNS_RESOLVER_RELOAD_RELOADED;
+ }
+ else
+ retval.status = res_init_retval.status;
+
+ retval.errnum = res_init_retval.errnum;
+ }
+
+ resolv_conf_modtime = resolv_conf_status.st_mtime;
+
+ return (status);
+ return (retval);
+}
+#endif /* HAVE_RES_INIT */
+
+
/*
* End of "$Id: http.c 12970 2015-11-13 20:02:51Z msweet $".
*/
diff -up cups-2.1.4/cups/http.h.resolv_reload cups-2.1.4/cups/http.h
--- cups-2.1.4/cups/http.h.resolv_reload 2016-06-14 19:45:32.000000000 +0200
+++ cups-2.1.4/cups/http.h 2017-04-05 17:36:21.814611369 +0200
+++ cups-2.1.4/cups/http.h 2017-04-27 10:35:32.279819884 +0200
@@ -57,6 +57,12 @@ typedef off_t ssize_t; /* @private@ */
# define SO_PEERCRED LOCAL_PEERCRED
# endif /* LOCAL_PEERCRED && !SO_PEERCRED */
@ -154,7 +217,7 @@ diff -up cups-2.1.4/cups/http.h.resolv_reload cups-2.1.4/cups/http.h
# define HTTP_MAX_BUFFER 2048 /* Max length of data buffer */
# define HTTP_MAX_VALUE 256 /* Max header field value length */
+# ifdef HAVE_RES_INIT
+# define HTTP_RESOLV_CONF_PATH "/etc/resolv.conf" /* Path to resolv.conf */
+# define DNS_RESOLV_CONF_PATH "/etc/resolv.conf" /* Path to resolv.conf */
+# endif /* HAVE_RES_INIT */
@ -164,80 +227,99 @@ diff -up cups-2.1.4/cups/http.h.resolv_reload cups-2.1.4/cups/http.h
} http_version_t;
+#ifdef HAVE_RES_INIT
+typedef enum http_resolv_check_e
+typedef enum dns_resolver_reload_e
+{
+ HTTP_RESOLV_CHECK_ERROR = -1,
+ HTTP_RESOLV_CHECK_OK = 0,
+ HTTP_RESOLV_CHECK_RELOADED = 1
+} http_resolv_check_t;
+ DNS_RESOLVER_RELOAD_ERROR = -1,
+ DNS_RESOLVER_RELOAD_OK = 0,
+ DNS_RESOLVER_RELOAD_RELOADED = 1
+} dns_resolver_reload_t;
+#endif /* HAVE_RES_INIT */
+
typedef union _http_addr_u /**** Socket address union, which
**** makes using IPv6 and other
**** address types easier and
@@ -646,6 +671,11 @@ extern void httpShutdown(http_t *http)
extern const char *httpStateString(http_state_t state) _CUPS_API_2_0;
extern const char *httpURIStatusString(http_uri_status_t status) _CUPS_API_2_0;
@@ -446,6 +471,13 @@ typedef struct http_credential_s /**** H
typedef int (*http_timeout_cb_t)(http_t *http, void *user_data);
/**** HTTP timeout callback @since CUPS 1.5/OS X 10.7@ ****/
+#ifdef HAVE_RES_INIT
+typedef struct dns_resolver_reload_retval
+{
+ dns_resolver_reload_t status;
+ int errnum;
+} dns_resolver_reload_rv;
+#endif /* HAVE_RES_INIT */
/*
@@ -592,6 +624,11 @@ extern http_version_t httpGetVersion(htt
extern int httpReconnect2(http_t *http, int msec, int *cancel)
_CUPS_API_1_6;
+/**** Prototype of function to check modification time of /etc/resolv.conf ****/
+#ifdef HAVE_RES_INIT
+extern http_resolv_check_t httpCheckResolv();
+extern dns_resolver_reload_rv dnsReloadResolver();
+#endif /* HAVE_RES_INIT */
+
/*
* C++ magic...
*/
/**** New in CUPS 1.7/OS X 10.9 ****/
extern http_t *httpAcceptConnection(int fd, int blocking)
diff -up cups-2.1.4/cups/http-support.c.resolv_reload cups-2.1.4/cups/http-support.c
--- cups-2.1.4/cups/http-support.c.resolv_reload 2017-04-05 17:36:21.795611556 +0200
+++ cups-2.1.4/cups/http-support.c 2017-04-05 17:36:21.814611369 +0200
@@ -2266,6 +2266,16 @@ http_resolve_cb(
--- cups-2.1.4/cups/http-support.c.resolv_reload 2017-04-27 10:31:13.411082168 +0200
+++ cups-2.1.4/cups/http-support.c 2017-04-27 10:31:13.434081967 +0200
@@ -2266,6 +2266,18 @@ http_resolve_cb(
http_addrlist_t *addrlist, /* List of addresses */
*addr; /* Current address */
+#ifdef HAVE_RES_INIT
+ /*
+ * Check if resolv.conf is modified, if so, reload resolver
+ */
+ * Check if resolv.conf is modified, if so, reload resolver
+ */
+
+ http_resolv_check_t status;
+ dns_resolver_reload_rv retval;
+
+ status = httpCheckResolv();
+ retval = dnsReloadResolver();
+ if (retval.status == DNS_RESOLVER_RELOAD_ERROR)
+ DEBUG_printf(("1http_resolve_cb: dnsReloadResolver() failed - %s.", strerror(retval.errnum)));
+#endif /* HAVE_RES_INIT */
+
DEBUG_printf(("8http_resolve_cb: Looking up \"%s\".", hostTarget));
snprintf(fqdn, sizeof(fqdn), "%d", ntohs(port));
diff -up cups-2.1.4/scheduler/conf.c.resolv_reload cups-2.1.4/scheduler/conf.c
--- cups-2.1.4/scheduler/conf.c.resolv_reload 2017-04-05 17:36:21.810611409 +0200
+++ cups-2.1.4/scheduler/conf.c 2017-04-05 17:36:21.815611359 +0200
@@ -939,6 +939,12 @@ cupsdReadConfiguration(void)
--- cups-2.1.4/scheduler/conf.c.resolv_reload 2017-04-27 10:31:13.429082011 +0200
+++ cups-2.1.4/scheduler/conf.c 2017-04-27 10:31:13.435081958 +0200
@@ -939,6 +939,15 @@ cupsdReadConfiguration(void)
if (!RemotePort)
BrowseLocalProtocols = 0; /* Disable sharing - no remote access */
+#ifdef HAVE_RES_INIT
+ http_resolv_check_t res_status; /* Return status of httpCheckResolv() */
+ dns_resolver_reload_rv retval; /* Return status of dnsReloadResolver() */
+
+ res_status = httpCheckResolv();
+ retval = dnsReloadResolver();
+
+ if (retval.status == DNS_RESOLVER_RELOAD_ERROR)
+ syslog(LOG_LPR, "1cupsdReadConfiguration: dnsReloadResolver() failed - %s.", strerror(retval.errnum));
+#endif /* HAVE_RES_INIT */
+
/*
* See if the ServerName is an IP address...
*/
diff -up cups-2.1.4/scheduler/main.c.resolv_reload cups-2.1.4/scheduler/main.c
--- cups-2.1.4/scheduler/main.c.resolv_reload 2017-04-05 17:36:21.805611458 +0200
+++ cups-2.1.4/scheduler/main.c 2017-04-05 17:39:05.278005085 +0200
@@ -141,6 +141,14 @@ main(int argc, /* I - Number of comm
--- cups-2.1.4/scheduler/main.c.resolv_reload 2017-04-27 10:31:13.421082081 +0200
+++ cups-2.1.4/scheduler/main.c 2017-04-27 10:31:13.435081958 +0200
@@ -140,6 +140,14 @@ main(int argc, /* I - Number of comm
long tmo_delay; /* Time before it must be called */
#endif /* HAVE_AVAHI */
+#ifdef HAVE_RES_INIT
+ http_resolv_check_t status; /* Return status from httpCheckResolv() */
+ dns_resolver_reload_rv retval; /* Return status from dnsReloadResolver() */
+
+ status = httpCheckResolv();
+ if (status == HTTP_RESOLV_CHECK_ERROR)
+ fputs("cupsd: Cannot reload a resolver, using old configuration now.\n", stderr);
+ retval = dnsReloadResolver();
+ if (retval.status == DNS_RESOLVER_RELOAD_ERROR)
+ fprintf(stderr, "cupsd: Cannot reload a resolver - %s , using old configuration now.\n", strerror(retval.errnum));
+#endif /* HAVE_RES_INIT */
+
#ifdef HAVE_GETEUID
/*
* Check for setuid invocation, which we do not support!

5
cups.spec
View File

@ -15,7 +15,7 @@ Summary: CUPS printing system
Name: cups
Epoch: 1
Version: 2.1.4
Release: 6%{?dist}
Release: 7%{?dist}
License: GPLv2
Url: http://www.cups.org/
Source0: http://www.cups.org/software/%{VERSION}/cups-%{VERSION}-source.tar.gz
@ -623,6 +623,9 @@ rm -f %{cups_serverbin}/backend/smb
%{_mandir}/man5/ipptoolfile.5.gz
%changelog
* Thu Apr 27 2017 Zdenek Dohnal <zdohnal@redhat.com> - 1:2.1.4-7
- copying cups-resolv_reload.patch from RHEL
* Wed Apr 05 2017 Zdenek Dohnal <zdohnal@redhat.com> - 1:2.1.4-6
- fixing issue with #1437065 - makes res_init() call to local resolver and keeps error message, but no hard exit for cupsd