int
tor_inet_aton(const char *str, struct in_addr *addr)
{
- unsigned a,b,c,d;
+ unsigned a, b, c, d;
char more;
+ bool is_octal = false;
+ smartlist_t *sl = NULL;
+
if (tor_sscanf(str, "%3u.%3u.%3u.%3u%c", &a, &b, &c, &d, &more) != 4)
return 0;
+
+ /* Parse the octets and check them for leading zeros. */
+ sl = smartlist_new();
+ smartlist_split_string(sl, str, ".", 0, 0);
+ SMARTLIST_FOREACH(sl, const char *, octet, {
+ is_octal = (strlen(octet) > 1 && octet[0] == '0');
+ if (is_octal) {
+ break;
+ }
+ });
+ SMARTLIST_FOREACH(sl, char *, octet, tor_free(octet));
+ smartlist_free(sl);
+
+ if (is_octal)
+ return 0;
+
if (a > 255) return 0;
if (b > 255) return 0;
if (c > 255) return 0;