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-rw-r--r--source3/include/ads.h7
-rw-r--r--source3/libads/ldap.c62
2 files changed, 60 insertions, 9 deletions
diff --git a/source3/include/ads.h b/source3/include/ads.h
index 49dcdd9a43..36351c1c2b 100644
--- a/source3/include/ads.h
+++ b/source3/include/ads.h
@@ -11,9 +11,16 @@ typedef struct {
char *kdc_server;
int ldap_port;
char *bind_path;
+ time_t last_attempt;
} ADS_STRUCT;
+/* time between reconnect attempts */
+#define ADS_RECONNECT_TIME 5
+
+/* timeout on searches */
+#define ADS_SEARCH_TIMEOUT 10
+
#define UF_DONT_EXPIRE_PASSWD 0x10000
#define UF_MNS_LOGON_ACCOUNT 0x20000
#define UF_SMARTCARD_REQUIRED 0x40000
diff --git a/source3/libads/ldap.c b/source3/libads/ldap.c
index b18e7927ae..14fd716058 100644
--- a/source3/libads/ldap.c
+++ b/source3/libads/ldap.c
@@ -62,6 +62,8 @@ int ads_connect(ADS_STRUCT *ads)
int version = LDAP_VERSION3;
int rc;
+ ads->last_attempt = time(NULL);
+
ads->ld = ldap_open(ads->ldap_server, ads->ldap_port);
if (!ads->ld) {
return errno;
@@ -75,6 +77,50 @@ int ads_connect(ADS_STRUCT *ads)
return rc;
}
+/*
+ a wrapper around ldap_search_s that retries depending on the error code
+ this is supposed to catch dropped connections and auto-reconnect
+*/
+int ads_search_retry(ADS_STRUCT *ads, const char *bind_path, int scope, const char *exp,
+ const char **attrs, void **res)
+{
+ struct timeval timeout;
+ int rc = -1, rc2;
+ int count = 3;
+
+ if (!ads->ld &&
+ time(NULL) - ads->last_attempt < ADS_RECONNECT_TIME) {
+ return LDAP_SERVER_DOWN;
+ }
+
+ while (count--) {
+ *res = NULL;
+ timeout.tv_sec = ADS_SEARCH_TIMEOUT;
+ timeout.tv_usec = 0;
+ if (ads->ld) {
+ rc = ldap_search_ext_s(ads->ld, bind_path, scope, exp, attrs, 0, NULL, NULL,
+ &timeout, LDAP_NO_LIMIT, (LDAPMessage **)res);
+ if (rc == 0) return rc;
+ }
+
+ if (*res) ads_msgfree(ads, *res);
+ *res = NULL;
+ DEBUG(1,("Reopening ads connection after error %s\n", ads_errstr(rc)));
+ if (ads->ld) {
+ /* we should unbind here, but that seems to trigger openldap bugs :(
+ ldap_unbind(ads->ld);
+ */
+ }
+ ads->ld = NULL;
+ rc2 = ads_connect(ads);
+ if (rc2) {
+ DEBUG(1,("ads_search_retry: failed to reconnect (%s)\n", ads_errstr(rc)));
+ return rc2;
+ }
+ }
+ DEBUG(1,("ads reopen failed after error %s\n", ads_errstr(rc)));
+ return rc;
+}
/*
do a general ADS search
@@ -83,9 +129,7 @@ int ads_search(ADS_STRUCT *ads, void **res,
const char *exp,
const char **attrs)
{
- *res = NULL;
- return ldap_search_s(ads->ld, ads->bind_path,
- LDAP_SCOPE_SUBTREE, exp, (char **)attrs, 0, (LDAPMessage **)res);
+ return ads_search_retry(ads, ads->bind_path, LDAP_SCOPE_SUBTREE, exp, attrs, res);
}
/*
@@ -95,9 +139,7 @@ int ads_search_dn(ADS_STRUCT *ads, void **res,
const char *dn,
const char **attrs)
{
- *res = NULL;
- return ldap_search_s(ads->ld, dn,
- LDAP_SCOPE_BASE, "(objectclass=*)", (char **)attrs, 0, (LDAPMessage **)res);
+ return ads_search_retry(ads, dn, LDAP_SCOPE_BASE, "(objectclass=*)", attrs, res);
}
/*
@@ -535,11 +577,13 @@ BOOL ads_USN(ADS_STRUCT *ads, uint32 *usn)
const char *attrs[] = {"highestCommittedUSN", NULL};
int rc;
void *res;
+ BOOL ret;
- rc = ldap_search_s(ads->ld, "",
- LDAP_SCOPE_BASE, "(objectclass=*)", attrs, 0, (LDAPMessage **)&res);
+ rc = ads_search_retry(ads, "", LDAP_SCOPE_BASE, "(objectclass=*)", attrs, &res);
if (rc || ads_count_replies(ads, res) != 1) return False;
- return ads_pull_uint32(ads, res, "highestCommittedUSN", usn);
+ ret = ads_pull_uint32(ads, res, "highestCommittedUSN", usn);
+ ads_msgfree(ads, res);
+ return ret;
}