Retry SSL_read on ERROR_WANT_READ.

This resolves the retry issue in general, but also the specific case where a TLS 1.3 server sends a post-handshake NewSessionTicket message prior to appdata.

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3925)

diff --git a/apps/s_time.c b/apps/s_time.c
index 998ef72b88224ea7ec441d823de713ede9b492b9..a7a25229a93844657a1728a9b317fd58cf3d2069 100644 (file)
--- a/apps/s_time.c
+++ b/apps/s_time.c
@@ -234,8 +234,8 @@ int s_time_main(int argc, char **argv)
                                    fmt_http_get_cmd, www_path);
             if (SSL_write(scon, buf, buf_len) <= 0)
                 goto end;
-            while ((i = SSL_read(scon, buf, sizeof(buf))) > 0)
-                bytes_read += i;
+            while ((i = SSL_read(scon, buf, sizeof(buf))) > 0 || SSL_get_error(scon, i) == SSL_ERROR_WANT_READ)
+                if (i > 0) bytes_read += i;
         }
 #ifdef NO_SHUTDOWN
         SSL_set_shutdown(scon, SSL_SENT_SHUTDOWN | SSL_RECEIVED_SHUTDOWN);
@@ -292,7 +292,7 @@ int s_time_main(int argc, char **argv)
                                fmt_http_get_cmd, www_path);
         if (SSL_write(scon, buf, buf_len) <= 0)
             goto end;
-        while (SSL_read(scon, buf, sizeof(buf)) > 0)
+        while ((i = SSL_read(scon, buf, sizeof(buf))) > 0 || SSL_get_error(scon, i) == SSL_ERROR_WANT_READ)
             continue;
     }
 #ifdef NO_SHUTDOWN
@@ -323,8 +323,8 @@ int s_time_main(int argc, char **argv)
                          www_path);
             if (SSL_write(scon, buf, strlen(buf)) <= 0)
                 goto end;
-            while ((i = SSL_read(scon, buf, sizeof(buf))) > 0)
-                bytes_read += i;
+            while ((i = SSL_read(scon, buf, sizeof(buf))) > 0 || SSL_get_error(scon, i) == SSL_ERROR_WANT_READ)
+                if (i > 0) bytes_read += i;
         }
 #ifdef NO_SHUTDOWN
         SSL_set_shutdown(scon, SSL_SENT_SHUTDOWN | SSL_RECEIVED_SHUTDOWN);