ITS#7513 added TCP keepalive support to back-meta

Author: Ted C. Cheng

doc/man/man5/slapd-meta.5

@@ -546,6 +546,25 @@ minutes and seconds.
 If set before any target specification, it affects all targets, unless
 overridden by any per-target directive.
 
+.TP
+.B keepalive  <idle>:<probes>:<interval>
+The
+.B keepalive
+parameter sets the values of \fIidle\fP, \fIprobes\fP, and \fIinterval\fP
+used to check whether a socket is alive;
+.I idle
+is the number of seconds a connection needs to remain idle before TCP
+starts sending keepalive probes;
+.I probes
+is the maximum number of keepalive probes TCP should send before dropping
+the connection;
+.I interval
+is interval in seconds between individual keepalive probes.
+Only some systems support the customization of these values;
+the
+.B keepalive
+parameter is ignored otherwise, and system-wide settings are used.
+
 .TP
 .B map "{attribute|objectclass} [<local name>|*] {<foreign name>|*}"
 This maps object classes and attributes as in the LDAP backend.

servers/slapd/back-meta/config.c

@@ -100,6 +100,7 @@ enum {
 	LDAP_BACK_CFG_SUBTREE_IN,
 	LDAP_BACK_CFG_PSEUDOROOTDN,
 	LDAP_BACK_CFG_PSEUDOROOTPW,
+	LDAP_BACK_CFG_KEEPALIVE,
 
 	LDAP_BACK_CFG_LAST
 };
@@ -407,6 +408,15 @@ static ConfigTable metacfg[] = {
 			"SYNTAX OMsDirectoryString "
 			"SINGLE-VALUE X-ORDERED 'SIBLINGS' )", NULL, NULL },
 
+	{ "keepalive", "keepalive", 2, 2, 0,
+		ARG_MAGIC|LDAP_BACK_CFG_KEEPALIVE,
+		meta_back_cf_gen, "( OLcfgDbAt:3.29 "
+			"NAME 'olcDbKeepalive' "
+			"DESC 'TCP keepalive' "
+			"SYNTAX OMsDirectoryString "
+			"SINGLE-VALUE )",
+		NULL, NULL },
+
 	{ NULL, NULL, 0, 0, 0, ARG_IGNORED,
 		NULL, NULL, NULL, NULL }
 };
@@ -466,6 +476,7 @@ static ConfigOCs metaocs[] = {
 			"$ olcDbSubtreeExclude "
 			"$ olcDbSubtreeInclude "
 			"$ olcDbTimeout "
+			"$ olcDbKeepalive "
 
 			/* defaults may be inherited */
 			COMMON_ATTRS
@@ -1589,6 +1600,16 @@ meta_back_cf_gen( ConfigArgs *c )
 			rc = 1;
 			break;
 
+		case LDAP_BACK_CFG_KEEPALIVE: {
+				struct berval bv;
+				char buf[AC_LINE_MAX];
+				bv.bv_len = AC_LINE_MAX;
+				bv.bv_val = &buf[0];
+				slap_keepalive_parse(&bv, &mt->mt_tls.sb_keepalive, 0, 0, 1);
+				value_add_one( &c->rvalue_vals, &bv );
+				break;
+			}
+
 		default:
 			rc = 1;
 		}
@@ -1803,6 +1824,12 @@ meta_back_cf_gen( ConfigArgs *c )
 			}
 			break;
 
+		case LDAP_BACK_CFG_KEEPALIVE:
+			mt->mt_tls.sb_keepalive.sk_idle = 0;
+			mt->mt_tls.sb_keepalive.sk_probes = 0;
+			mt->mt_tls.sb_keepalive.sk_interval = 0;
+			break;
+
 		default:
 			rc = 1;
 			break;
@@ -2809,6 +2836,11 @@ map_fail:;
 		break;
 #endif /* SLAPD_META_CLIENT_PR */
 
+	case LDAP_BACK_CFG_KEEPALIVE:
+		slap_keepalive_parse( ber_bvstrdup(c->argv[1]),
+				 &mt->mt_tls.sb_keepalive, 0, 0, 0);
+		break;
+
 	/* anything else */
 	default:
 		return SLAP_CONF_UNKNOWN;

servers/slapd/back-meta/conn.c

@@ -421,6 +421,8 @@ retry_lock:;
 	ldap_set_option( msc->msc_ld, LDAP_OPT_REFERRALS,
 		META_BACK_TGT_CHASE_REFERRALS( mt ) ? LDAP_OPT_ON : LDAP_OPT_OFF );
 
+	slap_client_keepalive(msc->msc_ld, &mt->mt_tls.sb_keepalive);
+
 #ifdef HAVE_TLS
 	if ( !is_ldaps ) {
 		slap_bindconf *sb = NULL;