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-rw-r--r--lib/gtls.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/gtls.c b/lib/gtls.c
index ee7612028..bbd87161d 100644
--- a/lib/gtls.c
+++ b/lib/gtls.c
@@ -67,6 +67,23 @@ static void tls_log_func(int level, const char *str)
}
#endif
+/*
+ * Custom push and pull callback functions used by GNU TLS to read and write
+ * to the socket. These functions are simple wrappers to send() and recv()
+ * (although here using the sread/swrite macros as defined by setup_once.h).
+ * We use custom functions rather than the GNU TLS defaults because it allows
+ * us to get specific about the fourth "flags" argument, and to use arbitrary
+ * private data with gnutls_transport_set_ptr if we wish.
+ */
+static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len)
+{
+ return swrite(s, buf, len);
+}
+
+static ssize_t Curl_gtls_pull(void *s, void *buf, size_t len)
+{
+ return sread(s, buf, len);
+}
/* Global GnuTLS init, called from Curl_ssl_init() */
int Curl_gtls_init(void)
@@ -285,6 +302,13 @@ Curl_gtls_connect(struct connectdata *conn,
gnutls_transport_set_ptr(session,
(gnutls_transport_ptr)conn->sock[sockindex]);
+ /* register callback functions to send and receive data. */
+ gnutls_transport_set_push_function(session, Curl_gtls_push);
+ gnutls_transport_set_pull_function(session, Curl_gtls_pull);
+
+ /* lowat must be set to zero when using custom push and pull functions. */
+ gnutls_transport_set_lowat(session, 0);
+
/* This might be a reconnect, so we check for a session ID in the cache
to speed up things */