From 40eb6b19a33f1261168e5d64ba162d6f7d80e5a1 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Fri, 10 Jul 2020 13:14:33 -0400
Subject: NSS: Tell NSS that our SSL sockets are nonblocking.

Closes ticket 40035.
---
 src/lib/tls/tortls_nss.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src')

diff --git a/src/lib/tls/tortls_nss.c b/src/lib/tls/tortls_nss.c
index 1436442e1c..6f6c47674e 100644
--- a/src/lib/tls/tortls_nss.c
+++ b/src/lib/tls/tortls_nss.c
@@ -418,6 +418,16 @@ tor_tls_new(tor_socket_t sock, int is_server)
     return NULL;
   }
 
+  /* even if though the socket is already nonblocking, we need to tell NSS
+   * about the fact, so that it knows what to do when it says EAGAIN. */
+  PRSocketOptionData data;
+  data.option = PR_SockOpt_Nonblocking;
+  data.value.non_blocking = 1;
+  if (PR_SetSocketOption(ssl, &data) != PR_SUCCESS) {
+    PR_Close(ssl);
+    return NULL;
+  }
+
   tor_tls_t *tls = tor_malloc_zero(sizeof(tor_tls_t));
   tls->magic = TOR_TLS_MAGIC;
   tls->context = ctx;
-- 
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