From c0490482d6ed3e065e30b906385d523bab39974b Mon Sep 17 00:00:00 2001
From: Pierangelo Masarati <ando@openldap.org>
Date: Sat, 12 Jun 2004 17:37:37 +0000
Subject: [PATCH] ignore the control if page is larger than requested sizelimit
 (as per RFC)

---
 servers/slapd/controls.c | 37 ++++++++++++++++++++++++++++++++++---
 servers/slapd/slap.h     |  3 ++-
 2 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/servers/slapd/controls.c b/servers/slapd/controls.c
index 20ae28a052..43e95ec0ec 100644
--- a/servers/slapd/controls.c
+++ b/servers/slapd/controls.c
@@ -598,6 +598,7 @@ int get_ctrls(
 
 			if (( sc->sc_mask & tagmask ) == tagmask ) {
 				/* available extension */
+				int	rc;
 
 				if( !sc->sc_parse ) {
 					rs->sr_err = LDAP_OTHER;
@@ -605,9 +606,24 @@ int get_ctrls(
 					goto return_results;
 				}
 
-				rs->sr_err = sc->sc_parse( op, rs, c );
-				assert( rs->sr_err != LDAP_UNAVAILABLE_CRITICAL_EXTENSION );
-				if( rs->sr_err != LDAP_SUCCESS ) goto return_results;
+				rc = sc->sc_parse( op, rs, c );
+				assert( rc != LDAP_UNAVAILABLE_CRITICAL_EXTENSION );
+				switch ( rc ) {
+				/* for some reason, the control should be ignored */
+				case SLAP_CTRL_IGNORE:
+					op->o_tmpfree( c, op->o_tmpmemctx );
+					op->o_ctrls[--nctrls] = NULL;
+					goto next_ctrl;
+				
+				/* the control was successfully parsed */
+				case LDAP_SUCCESS:
+					break;
+
+				/* something happened... */
+				default:
+					rs->sr_err = rc;
+					goto return_results;
+				}
 
 				if ( sc->sc_mask & SLAP_CTRL_FRONTEND ) {
 					/* kludge to disable backend_control() check */
@@ -633,6 +649,7 @@ int get_ctrls(
 			rs->sr_text = "critical extension is not recognized";
 			goto return_results;
 		}
+next_ctrl:;
 	}
 
 return_results:
@@ -885,6 +902,20 @@ static int parsePagedResults (
 		return LDAP_PROTOCOL_ERROR;
 	}
 
+	/*
+	 * NOTE: according to RFC 2696 3.:
+	 *
+	     If the page size is greater than or equal to the sizeLimit value, the
+	     server should ignore the control as the request can be satisfied in a
+	     single page.
+	 *
+	 * NOTE: this assumes that the op->ors_slimit be set before the controls
+	 * are parsed.
+	 */
+	if ( op->ors_slimit > 0 && size >= op->ors_slimit ) {
+		return SLAP_CTRL_IGNORE;
+	}
+
 	if( cookie.bv_len ) {
 		PagedResultsCookie reqcookie;
 		if( cookie.bv_len != sizeof( reqcookie ) ) {
diff --git a/servers/slapd/slap.h b/servers/slapd/slap.h
index 0a36d8da30..0a51ee120a 100644
--- a/servers/slapd/slap.h
+++ b/servers/slapd/slap.h
@@ -2376,7 +2376,8 @@ enum {
 #endif
 
 #define SLAP_CTRL_FRONTEND			0x00800000U
-#define SLAP_CTRL_FRONTEND_SEARCH	0x00010000U	/* for NOOP */
+#define SLAP_CTRL_FRONTEND_SEARCH		0x00010000U	/* for NOOP */
+#define SLAP_CTRL_IGNORE			0x00020000U
 
 #define SLAP_CTRL_OPFLAGS			0x0000FFFFU
 #define SLAP_CTRL_ABANDON			0x00000001U
-- 
2.39.5