X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Futils.c;h=fadfd05fd7d96946fe77a8118d45ca4a7b451efb;hp=65ba4b90402bc0df2df50fccf2f3e618c6e37597;hb=c2dc3784f127ef6db6e9960a4abecc1aab6f4e31;hpb=04fc19112da5e7fcefefcf6e490987cdcfb6f620

diff --git a/src/utils.c b/src/utils.c
index 65ba4b90..fadfd05f 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -158,7 +158,7 @@ int b64encode_urlsafe(const void *src, char *dst, int length) {
 const char *winerror(int err) {
 	static char buf[1024], *ptr;
 
-	ptr = buf + sprintf(buf, "(%d) ", err);
+	ptr = buf + snprintf(buf, sizeof buf, "(%d) ", err);
 
 	if (!FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
 		NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), ptr, sizeof(buf) - (ptr - buf), NULL)) {
@@ -191,6 +191,22 @@ bool check_id(const char *id) {
 	return true;
 }
 
+bool check_netname(const char *netname, bool strict) {
+	if(!netname || !*netname || *netname == '.')
+		return false;
+
+	for(const char *c = netname; *c; c++) {
+		if(iscntrl(*c))
+			return false;
+		if(*c == '/' || *c == '\\')
+			return false;
+		if(strict && strchr(" $%<>:`\"|?*", *c))
+			return false;
+	}
+
+	return true;
+}
+
 /* Windows doesn't define HOST_NAME_MAX. */
 #ifndef HOST_NAME_MAX
 #define HOST_NAME_MAX 255