noip.c (present_sockaddr): Handle a null address pointer.

We'll want this functionality soon.

diff --git a/noip.c b/noip.c
index 12c9f9ca23de1d99959cc86d0d72622530b9282d..e7f13cd6e1a4d19d45c8b56d263ad6d63285576a 100644 (file)
--- a/noip.c
+++ b/noip.c
@@ -409,6 +409,7 @@ static char *present_sockaddr(const struct sockaddr *sa, socklen_t len,
 #define WANT(n_) do { if (sz < (n_)) goto nospace; } while (0)
 #define PUTC(c_) do { *buf++ = (c_); sz--; } while (0)
 
+  if (!sa) return "<null-address>";
   if (!sz) return "<no-space-in-buffer>";
   if (!len) len = family_socklen(sa->sa_family);