Add tests with non-blocking I/O
Make sure we behave properly when f_send() or f_recv() return
MBEDTLS_ERR_SSL_WANT_{WRITE,READ}.
@@ -5134,6 +5134,26 @@ run_test "DTLS fragmenting: proxy MTU, simple handshake" \
-c "found fragmented DTLS handshake message" \
-C "error"
+not_with_valgrind # spurious resend due to timeout
+requires_config_enabled MBEDTLS_SSL_PROTO_DTLS
+requires_config_enabled MBEDTLS_RSA_C
+requires_config_enabled MBEDTLS_ECDSA_C
+run_test "DTLS fragmenting: proxy MTU, simple handshake, nbio" \
+ -p "$P_PXY mtu=512" \
+ "$P_SRV dtls=1 debug_level=2 auth_mode=required \
+ crt_file=data_files/server7_int-ca.crt \
+ key_file=data_files/server7.key \
+ mtu=512 nbio=2" \
+ "$P_CLI dtls=1 debug_level=2 \
+ crt_file=data_files/server8_int-ca2.crt \
+ key_file=data_files/server8.key \
+ mtu=512 nbio=2" \
+ 0 \
+ -S "resend" \
+ -s "found fragmented DTLS handshake message" \
+ -c "found fragmented DTLS handshake message" \
+ -C "error"
+
# This ensures things still work after session_reset(),
# for example it would have caught #1941.
# It also exercises the "resumed hanshake" flow.
@@ -5321,6 +5341,25 @@ run_test "DTLS fragmenting: proxy MTU + 3d" \
-c "found fragmented DTLS handshake message" \
-C "error"
+requires_config_enabled MBEDTLS_SSL_PROTO_DTLS
+requires_config_enabled MBEDTLS_RSA_C
+requires_config_enabled MBEDTLS_ECDSA_C
+client_needs_more_time 2
+run_test "DTLS fragmenting: proxy MTU + 3d, nbio" \
+ -p "$P_PXY mtu=512 drop=8 delay=8 duplicate=8" \
+ "$P_SRV dtls=1 debug_level=2 auth_mode=required \
+ crt_file=data_files/server7_int-ca.crt \
+ key_file=data_files/server7.key \
+ hs_timeout=250-10000 mtu=512 nbio=2" \
+ "$P_CLI dtls=1 debug_level=2 \
+ crt_file=data_files/server8_int-ca2.crt \
+ key_file=data_files/server8.key \
+ hs_timeout=250-10000 mtu=512 nbio=2" \
+ 0 \
+ -s "found fragmented DTLS handshake message" \
+ -c "found fragmented DTLS handshake message" \
+ -C "error"
+
# interop tests for DTLS fragmentating with reliable connection
#
# here and below we just want to test that the we fragment in a way that
