[fedfs-utils] [PATCH 09/11] plug-in: Follow LDAP referrals when resolving FSNs
Chuck Lever
chuck.lever at oracle.com
Fri Dec 14 14:38:36 PST 2012
FSN resolution is allowed to follow LDAP referrals if the NSDB's
"follow referrals" flag is on.
Signed-off-by: Chuck Lever <chuck.lever at oracle.com>
---
src/plug-ins/nfs-plugin.c | 53 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/src/plug-ins/nfs-plugin.c b/src/plug-ins/nfs-plugin.c
index 71f0cda..c50c648 100644
--- a/src/plug-ins/nfs-plugin.c
+++ b/src/plug-ins/nfs-plugin.c
@@ -327,6 +327,52 @@ nfs_jp_convert_fedfs_fsls(struct fedfs_fsl *fsls, nfs_fsloc_set_t new)
}
/**
+ * Attempt to follow an LDAP referral to another NSDB
+ *
+ * @param host OUT: pointer to an initialized nsdb_t that may be replaced
+ * @return a FedFsStatus code
+ */
+static FedFsStatus
+nfs_jp_follow_ldap_referral(nsdb_t *host)
+{
+ static unsigned int nest = 0;
+ FedFsStatus retval;
+ nsdb_t old, refer;
+
+ old = *host;
+ if (!nsdb_follow_referrals(old)) {
+ nfs_jp_debug("LDAP referrals for NSDB %s:%u disallowed\n",
+ nsdb_hostname(old), nsdb_port(old));
+ return FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED;
+ }
+
+ if (nest++ > 10) {
+ nfs_jp_debug("Possible referral loop for NSDB %s:%u\n",
+ nsdb_hostname(old), nsdb_port(old));
+ return FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED;
+ }
+
+ retval = nsdb_lookup_nsdb_by_uri(nsdb_referred_to(old), &refer);
+ switch (retval) {
+ case FEDFS_OK:
+ break;
+ case FEDFS_ERR_NSDB_PARAMS:
+ nfs_jp_debug("Encountered referral to unrecognized NSDB %s\n",
+ nsdb_referred_to(old));
+ return FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED;
+ default:
+ nfs_jp_debug("Problem following referral: %s\n",
+ nsdb_display_fedfsstatus(retval));
+ return retval;
+ }
+
+ nsdb_close_nsdb(old);
+ nsdb_free_nsdb(old);
+ *host = refer;
+ return FEDFS_OK;
+}
+
+/**
* Resolve a FedFS fileset name into a set of NFS locations
*
* @param fsn_uuid NUL-terminated C string containing FSN UUID to resolve
@@ -348,6 +394,7 @@ nfs_jp_resolve_fsn(const char *fsn_uuid, nsdb_t host,
FedFsStatus retval;
int fsn_ttl;
+again:
if (nsdb_open_nsdb(host, NULL, NULL, &ldap_err) != FEDFS_OK)
return JP_NSDBLOCAL;
@@ -394,6 +441,12 @@ nfs_jp_resolve_fsn(const char *fsn_uuid, nsdb_t host,
__func__, fsn_uuid);
break;
case FEDFS_ERR_NSDB_LDAP_VAL:
+ if (ldap_err == LDAP_REFERRAL) {
+ retval = nfs_jp_follow_ldap_referral(&host);
+ if (retval != FEDFS_OK)
+ break;
+ goto again;
+ }
nfs_jp_debug("%s: NSDB operation failed with %s\n",
__func__, ldap_err2string(ldap_err));
break;
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