101_close-fds.diff from the Debian package version 20080615-8:

  "wide-dhcpv6 binaries should close inherited fds."

3 files changed, 17 insertions, 1 deletions

diff --git a/dhcp6c.c b/dhcp6c.c
index 1caaaa5..b5f5ed7 100644
--- a/dhcp6c.c
+++ b/dhcp6c.c
@@ -159,6 +159,7 @@ main(argc, argv)
 	char *progname;
 	FILE *pidfp;
 	struct dhcp6_if *ifp;
+	int fd;
 
 #ifndef HAVE_ARC4RANDOM
 	srandom(time(NULL) & getpid());
@@ -205,8 +206,12 @@ main(argc, argv)
 		exit(0);
 	}
 
-	if (foreground == 0)
+	if (foreground == 0) {
+		for (fd = 3; fd < 1024; fd++)
+			close(fd);
+
 		openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
+	}
 
 	setloglevel(debug);
 
diff --git a/dhcp6relay.c b/dhcp6relay.c
index fb84ce3..eb0bce9 100644
--- a/dhcp6relay.c
+++ b/dhcp6relay.c
@@ -207,8 +207,14 @@ main(argc, argv)
 	}
 
 	if (foreground == 0) {
+		int fd;
+
 		if (daemon(0, 0) < 0)
 			err(1, "daemon");
+
+		for (fd = 3; fd < 1024; fd++)
+			close(fd);
+
 		openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
 	}
 	setloglevel(debug);
diff --git a/dhcp6s.c b/dhcp6s.c
index 544afff..494e571 100644
--- a/dhcp6s.c
+++ b/dhcp6s.c
@@ -316,8 +316,13 @@ main(argc, argv)
 	}
 
 	if (foreground == 0) {
+		int fd;
+
 		if (daemon(0, 0) < 0)
 			err(1, "daemon");
+
+		for (fd = 3; fd < 1024; fd++)
+			close(fd);
 	}
 
 	/* dump current PID */