From c9c3cc03bfec664f7386011f3fc608d1c0844836 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@tinc-vpn.org>
Date: Thu, 30 May 2013 16:43:20 +0200
Subject: [PATCH] Better optional argument handling.

Some options can take an optional argument. However, in this case GNU getopt
requires that the optional argument is right next to the option without
whitespace inbetween. If there is whitespace, getopt will treat it as a
non-option argument, but tinc ignored those without a warning. Now tinc will
allow optional arguments with whitespace inbetween, and will give an error when
it encounters any other non-option arguments.
---
 src/tincd.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/tincd.c b/src/tincd.c
index aaad1da6..7416d11b 100644
--- a/src/tincd.c
+++ b/src/tincd.c
@@ -178,7 +178,9 @@ static bool parse_options(int argc, char **argv) {
 				break;
 #endif
 
-			case 'd':				/* inc debug level */
+			case 'd':				/* increase debug level */
+				if(!optarg && optind < argc && *argv[optind] != '-')
+					optarg = argv[optind++];
 				if(optarg)
 					debug_level = atoi(optarg);
 				else
@@ -187,6 +189,8 @@ static bool parse_options(int argc, char **argv) {
 
 			case 'k':				/* kill old tincds */
 #ifndef HAVE_MINGW
+				if(!optarg && optind < argc && *argv[optind] != '-')
+					optarg = argv[optind++];
 				if(optarg) {
 					if(!strcasecmp(optarg, "HUP"))
 						kill_tincd = SIGHUP;
@@ -225,8 +229,7 @@ static bool parse_options(int argc, char **argv) {
 
 			case 'n':				/* net name given */
 				/* netname "." is special: a "top-level name" */
-				netname = strcmp(optarg, ".") != 0 ?
-						xstrdup(optarg) : NULL;
+				netname = strcmp(optarg, ".") != 0 ? xstrdup(optarg) : NULL;
 				break;
 
 			case 'o':				/* option */
@@ -237,6 +240,8 @@ static bool parse_options(int argc, char **argv) {
 				break;
 
 			case 'K':				/* generate public/private keypair */
+				if(!optarg && optind < argc && *argv[optind] != '-')
+					optarg = argv[optind++];
 				if(optarg) {
 					generate_keys = atoi(optarg);
 
@@ -274,6 +279,8 @@ static bool parse_options(int argc, char **argv) {
 
 			case 4:					/* write log entries to a file */
 				use_logfile = true;
+				if(!optarg && optind < argc && *argv[optind] != '-')
+					optarg = argv[optind++];
 				if(optarg)
 					logfilename = xstrdup(optarg);
 				break;
@@ -291,6 +298,12 @@ static bool parse_options(int argc, char **argv) {
 		}
 	}
 
+	if(optind < argc) {
+		fprintf(stderr, "%s: unrecognized argument '%s'\n", argv[0], argv[optind]);
+		usage(true);
+		return false;
+	}
+
 	return true;
 }
 
-- 
2.20.1