From 222a1a48e8af33b5bc9cadbaa1579d28d9061736 Mon Sep 17 00:00:00 2001
From: krw <krw@openbsd.org>
Date: Mon, 18 Dec 2017 14:17:58 +0000
Subject: [PATCH] Stop inserting and paying attention to 'interface <if>;'
 inside 'lease {}' declarations. We don't keep leases from multiple interfaces
 in dhclient.leases.<if> files.

One less thing to parse and keep in memory. More rope for
those wanting to do unspeakable things with their lease files.
---
 sbin/dhclient/clparse.c         | 18 +++++-------------
 sbin/dhclient/dhclient.c        |  8 +-------
 sbin/dhclient/dhclient.leases.5 | 10 ++--------
 sbin/dhclient/dhcpd.h           |  3 +--
 4 files changed, 9 insertions(+), 30 deletions(-)

diff --git a/sbin/dhclient/clparse.c b/sbin/dhclient/clparse.c
index db82ae7de12..722b7aee15b 100644
--- a/sbin/dhclient/clparse.c
+++ b/sbin/dhclient/clparse.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: clparse.c,v 1.158 2017/12/17 14:24:04 krw Exp $	*/
+/*	$OpenBSD: clparse.c,v 1.159 2017/12/18 14:17:58 krw Exp $	*/
 
 /* Parser for dhclient config and lease files. */
 
@@ -543,13 +543,7 @@ parse_lease(FILE *cfile, char *name,
 		}
 		if (token == '}') {
 			token = next_token(NULL, cfile);
-			if (lease->interface != NULL &&
-			    strcmp(name, lease->interface) == 0)
-				*lp = lease;
-			else {
-				*lp = NULL;
-				free_client_lease(lease);
-			}
+			*lp = lease;
 			return 1;
 		}
 		parse_lease_declaration(cfile, lease, name);
@@ -607,11 +601,9 @@ parse_lease_declaration(FILE *cfile, struct client_lease *lease,
 			return;
 		break;
 	case TOK_INTERFACE:
-		if (parse_string(cfile, NULL, &val) == 0)
-			return;
-		free(lease->interface);
-		lease->interface = val;
-		break;
+		/* 'interface' is just a comment. */
+		skip_to_semi(cfile);
+		return;
 	case TOK_NEXT_SERVER:
 		if (parse_ip_addr(cfile, &lease->next_server) == 0)
 			return;
diff --git a/sbin/dhclient/dhclient.c b/sbin/dhclient/dhclient.c
index fce081c919a..d193457758a 100644
--- a/sbin/dhclient/dhclient.c
+++ b/sbin/dhclient/dhclient.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dhclient.c,v 1.541 2017/12/16 20:47:53 krw Exp $	*/
+/*	$OpenBSD: dhclient.c,v 1.542 2017/12/18 14:17:58 krw Exp $	*/
 
 /*
  * Copyright 2004 Henning Brauer <henning@openbsd.org>
@@ -1683,7 +1683,6 @@ free_client_lease(struct client_lease *lease)
 	if (lease == NULL)
 		return;
 
-	free(lease->interface);
 	free(lease->server_name);
 	free(lease->filename);
 	for (i = 0; i < DHO_COUNT; i++)
@@ -1883,11 +1882,6 @@ lease_as_string(char *ifname, char *type, struct client_lease *lease)
 	strlcat(string, " {\n", sizeof(string));
 	strlcat(string, BOOTP_LEASE(lease) ? "  bootp;\n" : "", sizeof(string));
 
-	buf = pretty_print_string(ifname, strlen(ifname), 1);
-	if (buf == NULL)
-		return NULL;
-	append_statement(string, sizeof(string), "  interface ", buf);
-
 	append_statement(string, sizeof(string), "  fixed-address ",
 	    inet_ntoa(lease->address));
 	append_statement(string, sizeof(string), "  next-server ",
diff --git a/sbin/dhclient/dhclient.leases.5 b/sbin/dhclient/dhclient.leases.5
index 430b3930bf4..782f71f3ad0 100644
--- a/sbin/dhclient/dhclient.leases.5
+++ b/sbin/dhclient/dhclient.leases.5
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: dhclient.leases.5,v 1.13 2017/11/09 17:30:22 jmc Exp $
+.\"	$OpenBSD: dhclient.leases.5,v 1.14 2017/12/18 14:17:58 krw Exp $
 .\"
 .\" Copyright (c) 1997 The Internet Software Consortium.
 .\" All rights reserved.
@@ -36,7 +36,7 @@
 .\" see ``http://www.isc.org/isc''.  To learn more about Vixie
 .\" Enterprises, see ``http://www.vix.com''.
 .\"
-.Dd $Mdocdate: November 9 2017 $
+.Dd $Mdocdate: December 18 2017 $
 .Dt DHCLIENT.LEASES 5
 .Os
 .Sh NAME
@@ -140,12 +140,6 @@ The IPv4 address of the lease.
 This is required for all lease statements.
 The IPv4 address is specified as a dotted quad (e.g. 12.34.56.78).
 .Pp
-.It Ic interface Qq Ar string
-The interface on which the lease is valid.
-Every lease must contain an
-.Ic interface
-declaration.
-.Pp
 .It Ic next-server Ar ip-address
 The IPv4 address of the boot server.
 The IPv4 address is specified as a dotted quad (e.g. 12.34.56.78).
diff --git a/sbin/dhclient/dhcpd.h b/sbin/dhclient/dhcpd.h
index 2cd04e1bf7b..19782e52554 100644
--- a/sbin/dhclient/dhcpd.h
+++ b/sbin/dhclient/dhcpd.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dhcpd.h,v 1.242 2017/12/16 20:47:53 krw Exp $	*/
+/*	$OpenBSD: dhcpd.h,v 1.243 2017/12/18 14:17:58 krw Exp $	*/
 
 /*
  * Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
@@ -56,7 +56,6 @@ struct reject_elem {
 
 struct client_lease {
 	TAILQ_ENTRY(client_lease) next;
-	char			*interface;
 	time_t			 epoch;
 	struct in_addr		 address;
 	struct in_addr		 next_server;
-- 
2.20.1