From: Alan T. DeKok <aland@freeradius.org>
Date: Tue, 22 Jul 2025 11:45:51 +0000 (+0200)
Subject: special error for EMSGSIZ
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c7f7309b0af1aaccc207d56e8787d6e5814e8ff8;p=thirdparty%2Ffreeradius-server.git

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 c381b72e94..959815cf1a 100644
--- 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;