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 b10c7e1da7ae0c5422a1110167580defbe448006..6976c3ce9c8cc859ca717c80a15a90f5e7a4ef11 100644 (file)
--- a/apps/s_time.c
+++ b/apps/s_time.c
@@ -240,8 +240,8 @@ int s_time_main(int argc, char **argv)
                                    www_path);
             if (buf_len <= 0 || 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);
@@ -297,7 +297,7 @@ int s_time_main(int argc, char **argv)
         buf_len = BIO_snprintf(buf, sizeof(buf), fmt_http_get_cmd, www_path);
         if (buf_len <= 0 || 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
@@ -328,8 +328,8 @@ int s_time_main(int argc, char **argv)
                                    www_path);
             if (buf_len <= 0 || 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);