From: Guus Sliepen <guus@tinc-vpn.org>
Date: Fri, 27 Sep 2013 09:36:46 +0000 (+0200)
Subject: Fix segfault when Name = $HOST but $HOST is not set.
X-Git-Tag: import-tinc-1.1~54
X-Git-Url: https://git.meshlink.io/?a=commitdiff_plain;h=68e3efe34980cc82ffc143fc33d3c11b69ec8e2b;p=meshlink

Fix segfault when Name = $HOST but $HOST is not set.

Conflicts:
	src/net_setup.c
---

diff --git a/src/net_setup.c b/src/net_setup.c
index b9c5df7a..601a3258 100644
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -411,17 +411,18 @@ char *get_name(void) {
 
 	if(*name == '$') {
 		char *envname = getenv(name + 1);
+		char hostname[32] = "";
 		if(!envname) {
 			if(strcmp(name + 1, "HOST")) {
 				logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
 				return false;
 			}
-			char envname[32];
-			if(gethostname(envname, 32)) {
+			if(gethostname(hostname, sizeof hostname) || !*hostname) {
 				logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", strerror(errno));
 				return false;
 			}
-			envname[31] = 0;
+			hostname[31] = 0;
+			envname = hostname;
 		}
 		free(name);
 		name = xstrdup(envname);