File dhcp-4.2.3-P1-dhclient-zero-length-options.patch of Package dhcp

From 70330e5cb91616dd235b63e54b9fe0dc15f3d61b Mon Sep 17 00:00:00 2001
From: Marius Tomaschewski <mt@suse.de>
Date: Thu, 5 Jan 2012 16:28:50 +0100
Subject: [PATCH] zero-length option lease parse error in dhclient6

common/parse.c:
Use peek_token only or the next_token call behind the while loop
will cause two warnings / errors in the log:
   lease line XX: semicolon expected.
   lease line XX: Unexpected end of file.
   [there is a } behind the semicolon as the next token in my case]
and the option (lease?) gets discarded.
To reproduce, use "send dhcp6.rapid-commit;" to /etc/dhclient6.conf,
remove the lease file and start the client. When the lease is bound,
kill the client and start it again.

client/dhclient.c:
More of cosmetic nature - do not print zero-length options like there
would be a value missed, e.g. "  option dhcp6.rapid-commit ;".

Signed-off-by: Marius Tomaschewski <mt@suse.de>
---
 client/dhclient.c |   11 ++++++++---
 common/parse.c    |    2 +-
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/client/dhclient.c b/client/dhclient.c
index bee8e1d..ee87aa6 100644
--- a/client/dhclient.c
+++ b/client/dhclient.c
@@ -2769,10 +2769,15 @@ void write_lease_option (struct option_cache *oc,
 	}
 	if (evaluate_option_cache (&ds, packet, lease, client_state,
 				   in_options, cfg_options, scope, oc, MDL)) {
-		fprintf(leaseFile, "%soption %s%s%s %s;\n", preamble,
-			name, dot, oc->option->name,
-			pretty_print_option(oc->option, ds.data, ds.len,
+		if(oc->option->format && oc->option->format[0] == 'Z' && ds.len == 0) {
+			fprintf(leaseFile, "%soption %s%s%s;\n", preamble,
+					name, dot, oc->option->name);
+		} else {
+			fprintf(leaseFile, "%soption %s%s%s %s;\n", preamble,
+				name, dot, oc->option->name,
+				pretty_print_option(oc->option, ds.data, ds.len,
 					    1, 1));
+		}
 		data_string_forget (&ds, MDL);
 	}
 }
diff --git a/common/parse.c b/common/parse.c
index 0fca63c..fe661d5 100644
--- a/common/parse.c
+++ b/common/parse.c
@@ -5715,7 +5715,7 @@ int parse_option_decl (oc, cfile)
 				goto alloc;
 
 			      case 'Z':	/* Zero-length option */
-				token = next_token(&val, (unsigned *)0, cfile);
+				token = peek_token(&val, (unsigned *)0, cfile);
 				if (token != SEMI) {
 					parse_warn(cfile,
 						   "semicolon expected.");
-- 
1.7.7