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On 06.09.2013. 21:56, hyc@symas.com wrote:
ian@uns.ac.rs wrote:
If a minimal chaining configuration is dynamically added to a consumer server in
a provider/consumer pair running delta-syncrepl, it will stop working when the
consumer is restarted. The configuration is modelled after the one used in
test022 in the OpenLDAP source distribution:
Sorry this report was neglected for so long, and thanks for the excellent test
case. This is now fixed in git master.
Tested against git master (721e46fe6695077d63a3df6ea2e397920a72308d) with the original
use case and it works, thanks. However, slapd now segfaults if started with cn=config
obtained by converting an existing chaining configuration from slapd.conf. Steps to
reproduce, using the scripts from the archive attached to the original report:
$ make clean-all replica-chaining
$ ./start-replica.sh # segfault
The crash is in chain_ldadd, and occurs because the first back-ldap instance in the
converted configuration lacks an olcDbURI. I have attached a patch which inserts a
dummy URI in the common parameter structure when it's allocated. This URI
(ldap://0.0.0.0) should never match any actual referral, so the instance can only
serve to initialize common parameters (which happens with the first instance anyway,
if I understood the code correctly.)
--
Ivan Nejgebauer
Glavni sistem inženjer CIT-UNS/ARMUNS
Univerzitet u Novom Sadu
Trg Dositeja Obradovića 5
21000 Novi Sad +381 21 485 2025
ian@uns.ac.rs
www.uns.ac.rs
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>From 49dc118a97cc5b7e0723905faf08480facb78912 Mon Sep 17 00:00:00 2001
From: Ivan Nejgebauer
ian@uns.ac.rs
Date: Mon, 9 Sep 2013 11:33:02 +0200
Subject: [PATCH] Fix crash w/converted chain config
As a result of the fix for ITS#7381 (4d02a43ec9a4be422d83094e8d39b7ef3bc290c5)
slapd segfaults if started with dynamic configuration after converting
a slapd.conf chaining setup to cn=config. This is because the common
back-ldap parameters, emitted as the first olcDatabase entry, lack an
olcDbURI attribute. This patch adds a dummy LDAP URI which should never
match a real one (ldap://0.0.0.0) to the common parameter structure.
---
servers/slapd/back-ldap/chain.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/servers/slapd/back-ldap/chain.c b/servers/slapd/back-ldap/chain.c
index a7c53ed..ab71b21 100644
--- a/servers/slapd/back-ldap/chain.c
+++ b/servers/slapd/back-ldap/chain.c
@@ -2019,6 +2019,7 @@ ldap_chain_db_init_common(
BackendInfo *bi = be->bd_info;
ldapinfo_t *li;
int rc;
+ char *dummy_uri = "ldap://0.0.0.0";
be->bd_info = lback;
be->be_private = NULL;
@@ -2029,6 +2030,8 @@ ldap_chain_db_init_common(
li = (ldapinfo_t *)be->be_private;
li->li_urllist_f = NULL;
li->li_urllist_p = NULL;
+ li->li_uri = ch_strdup( dummy_uri );
+ li->li_bvuri = ch_calloc( sizeof( struct berval ), 1 );
be->bd_info = bi;
--
1.8.1.2
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