[spice-gtk v2 2/3] ssl: Rework our custom BIO type

[Christophe Fergeau <cfergeau@xxxxxxxxxx>]

From: Sebastian Andrzej Siewior <sebastian@xxxxxxxxxxxxx>

This commit changes to an actual new BIO method rather than reusing an
existing BIO method, and overriding only the fields that we need.
The approach before this commit would be causing issues with OpenSSL
1.1.0 as some of the fields we access have become opaque.
---
 src/bio-gio.c | 57 ++++++++++++++++++++++++++++-----------------------------
 1 file changed, 28 insertions(+), 29 deletions(-)

diff --git a/src/bio-gio.c b/src/bio-gio.c
index b310c97..0f8b415 100644
--- a/src/bio-gio.c
+++ b/src/bio-gio.c
@@ -23,21 +23,22 @@
 #include "spice-util.h"
 #include "bio-gio.h"
 
-typedef struct bio_gsocket_method {
-    BIO_METHOD method;
-    GIOStream *stream;
-} bio_gsocket_method;
-
-#define BIO_GET_GSOCKET(bio)  (((bio_gsocket_method*)bio->method)->gsocket)
-#define BIO_GET_ISTREAM(bio)  (g_io_stream_get_input_stream(((bio_gsocket_method*)bio->method)->stream))
-#define BIO_GET_OSTREAM(bio)  (g_io_stream_get_output_stream(((bio_gsocket_method*)bio->method)->stream))
+static long bio_gio_ctrl(G_GNUC_UNUSED BIO *b,
+                         int cmd,
+                         G_GNUC_UNUSED long num,
+                         G_GNUC_UNUSED void *ptr)
+{
+    return (cmd == BIO_CTRL_FLUSH);
+}
 
 static int bio_gio_write(BIO *bio, const char *in, int inl)
 {
+    GOutputStream *stream;
     gssize ret;
     GError *error = NULL;
 
-    ret = g_pollable_output_stream_write_nonblocking(G_POLLABLE_OUTPUT_STREAM(BIO_GET_OSTREAM(bio)),
+    stream = g_io_stream_get_output_stream(bio->ptr);
+    ret = g_pollable_output_stream_write_nonblocking(G_POLLABLE_OUTPUT_STREAM(stream),
                                                      in, inl, NULL, &error);
     BIO_clear_retry_flags(bio);
 
@@ -53,10 +54,12 @@ static int bio_gio_write(BIO *bio, const char *in, int inl)
 
 static int bio_gio_read(BIO *bio, char *out, int outl)
 {
+    GInputStream *stream;
     gssize ret;
     GError *error = NULL;
 
-    ret = g_pollable_input_stream_read_nonblocking(G_POLLABLE_INPUT_STREAM(BIO_GET_ISTREAM(bio)),
+    stream = g_io_stream_get_input_stream(bio->ptr);
+    ret = g_pollable_input_stream_read_nonblocking(G_POLLABLE_INPUT_STREAM(stream),
                                                    out, outl, NULL, &error);
     BIO_clear_retry_flags(bio);
 
@@ -70,17 +73,6 @@ static int bio_gio_read(BIO *bio, char *out, int outl)
     return ret;
 }
 
-static int bio_gio_destroy(BIO *bio)
-{
-    if (bio == NULL || bio->method == NULL)
-        return 0;
-
-    SPICE_DEBUG("bio gsocket destroy");
-    g_clear_pointer(&bio->method, g_free);
-
-    return 1;
-}
-
 static int bio_gio_puts(BIO *bio, const char *str)
 {
     int n, ret;
@@ -91,23 +83,30 @@ static int bio_gio_puts(BIO *bio, const char *str)
     return ret;
 }
 
+#define BIO_TYPE_START 128
+
 G_GNUC_INTERNAL
 BIO* bio_new_giostream(GIOStream *stream)
 {
-    // TODO: make an actual new BIO type, or just switch to GTls already...
-    BIO *bio = BIO_new_socket(-1, BIO_NOCLOSE);
+    BIO *bio;
+    static BIO_METHOD bio_gio_method;
 
-    bio_gsocket_method *bio_method = g_new(bio_gsocket_method, 1);
-    bio_method->method = *bio->method;
-    bio_method->stream = stream;
+    if (bio_gio_method.name == NULL) {
+        bio_gio_method.type = BIO_TYPE_START | BIO_TYPE_SOURCE_SINK;
+        bio_gio_method.name = "gio stream";
+    }
 
-    bio->method->destroy(bio);
-    bio->method = (BIO_METHOD*)bio_method;
+    bio = BIO_new(&bio_gio_method);
+    if (!bio)
+        return NULL;
 
     bio->method->bwrite = bio_gio_write;
     bio->method->bread = bio_gio_read;
     bio->method->bputs = bio_gio_puts;
-    bio->method->destroy = bio_gio_destroy;
+    bio->method->ctrl = bio_gio_ctrl;
+
+    bio->init = 1;
+    bio->ptr = stream;
 
     return bio;
 }
-- 
2.9.3

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