special error for EMSGSIZ

Azure and other things cause issues, so we make the error message
clearer.  Not use "too long", but "UDP fragmentation is broken"

diff --git a/src/lib/radius.c b/src/lib/radius.c
index c381b72e94dcdb7ed5eb95737238e6eaa6bd46c3..959815cf1a733ca32621a6fa6da10227c6b759d9 100644 (file)
--- a/src/lib/radius.c
+++ b/src/lib/radius.c
@@ -325,7 +325,11 @@ static int rad_sendto(int sockfd, void *data, size_t data_len, int flags,
 done:
 #endif
        if (rcode < 0) {
-               fr_strerror_printf("sendto failed: %s", fr_syserror(errno));
+               if (errno == EMSGSIZ) {
+                       fr_strerror_printf("sendto failed - destination does not support UDP fragmentation: %s", fr_syserror(errno));
+               } else {
+                       fr_strerror_printf("sendto failed: %s", fr_syserror(errno));
+               }
        }
 
        return rcode;