diff options
| -rw-r--r-- | ares_expand_name.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/ares_expand_name.c b/ares_expand_name.c index 7fe025f..ffa26e6 100644 --- a/ares_expand_name.c +++ b/ares_expand_name.c @@ -74,6 +74,14 @@ int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf, return ARES_ENOMEM; q = *s; + if (len == 0) { + // RFC2181 says this should be ".": the root of the DNS tree. + // Since this function strips trailing dots though, it becomes "" + q[0] = '\0'; + *enclen = 1; // the caller should move one byte to get past this + return ARES_SUCCESS; + } + /* No error-checking necessary; it was all done by name_length(). */ p = encoded; while (*p) |