From c48092b666373785780a33898a3df0e88fe7ab6e Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@leeloo.lan.home.verplant.org>
Date: Tue, 29 Sep 2009 18:09:27 +0200
Subject: [PATCH] =?utf8?q?oping:=20Allow=20=E2=80=9C-f=20-=E2=80=9D=20even?=
 =?utf8?q?=20if=20uid=20and=20euid=20differ.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

Thanks to Sebastian for the idea :)
---
 src/mans/oping.pod | 7 ++++---
 src/oping.c        | 2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/mans/oping.pod b/src/mans/oping.pod
index fc8911d..12c3a65 100644
--- a/src/mans/oping.pod
+++ b/src/mans/oping.pod
@@ -58,9 +58,10 @@ Set the outgoing network device to use.
 Instead of specifying hostnames on the command line, read them from
 I<filename>. If I<filename> is B<->, read from C<STDIN>.
 
-This option is only available if the real user ID (as returned by L<getuid(2)>)
-and the effective user ID (as returned by L<geteuid(2)>) match. This is meant
-to avoid security issues when I<oping> is installed with the SUID-bit.
+If the real user ID (as returned by L<getuid(2)>) and the effective user ID (as
+returned by L<geteuid(2)>) differ, the only argument allowed for this option is
+"-" (i.E<nbsp>e. standard input). This is meant to avoid security issues when
+I<oping> is installed with the SUID-bit.
 
 =back
 
diff --git a/src/oping.c b/src/oping.c
index 8419710..3d1eddd 100644
--- a/src/oping.c
+++ b/src/oping.c
@@ -170,7 +170,7 @@ static int read_options (int argc, char **argv)
 				break;
 
 			case 'f':
-				if (is_setuid ())
+				if (is_setuid () && (strcmp ("-", optarg) != 0))
 				{
 					fprintf (stderr, "For security reasons the `-f' option "
 							"is disabled if real and effective "
-- 
2.11.0