From 713db1e1e2298be19e152f011824d36d57c28f38 Mon Sep 17 00:00:00 2001 From: kaber Date: Tue, 27 Jul 2004 21:46:21 +0000 Subject: Check that TTL is between 0 and 255 (Nicolas Bouliane) --- extensions/libipt_TTL.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) (limited to 'extensions/libipt_TTL.c') diff --git a/extensions/libipt_TTL.c b/extensions/libipt_TTL.c index e6f8a0c..cdf1f88 100644 --- a/extensions/libipt_TTL.c +++ b/extensions/libipt_TTL.c @@ -1,7 +1,7 @@ /* Shared library add-on to iptables for the TTL target * (C) 2000 by Harald Welte * - * $Id: libipt_TTL.c,v 1.5 2002/03/14 11:35:58 laforge Exp $ + * $Id: libipt_TTL.c,v 1.6 2002/05/29 13:08:16 laforge Exp $ * * This program is distributed under the terms of GNU GPL */ @@ -24,9 +24,9 @@ static void help(void) { printf( "TTL target v%s options\n" -" --ttl-set value Set TTL to \n" -" --ttl-dec value Decrement TTL by \n" -" --ttl-inc value Increment TTL by \n" +" --ttl-set value Set TTL to \n" +" --ttl-dec value Decrement TTL by \n" +" --ttl-inc value Increment TTL by \n" , IPTABLES_VERSION); } @@ -35,7 +35,7 @@ static int parse(int c, char **argv, int invert, unsigned int *flags, struct ipt_entry_target **target) { struct ipt_TTL_info *info = (struct ipt_TTL_info *) (*target)->data; - u_int8_t value; + unsigned int value; if (*flags & IPT_TTL_USED) { exit_error(PARAMETER_PROBLEM, @@ -50,7 +50,9 @@ static int parse(int c, char **argv, int invert, unsigned int *flags, exit_error(PARAMETER_PROBLEM, "TTL: unexpected `!'"); - value = atoi(optarg); + if (string_to_number(optarg, 0, 255, &value) == -1) + exit_error(PARAMETER_PROBLEM, + "TTL: Expected value between 0 and 255"); switch (c) { -- cgit v1.2.3