Add a packet splitting BIO

Provide a BIO filter that can split QUIC datagrams containing multiple
packets, such that each packet is in its own datagram.

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22157)

1 files changed, 61 insertions, 0 deletions

diff --git a/test/helpers/quictestlib.c b/test/helpers/quictestlib.c
index 28791267ed..6381d720ff 100644
--- a/test/helpers/quictestlib.c
+++ b/test/helpers/quictestlib.c
@@ -1044,3 +1044,64 @@ int qtest_fault_resize_datagram(QTEST_FAULT *fault, size_t newlen)
 
     return 1;
 }
+
+/* There isn't a public function to do BIO_ADDR_copy() so we create one */
+int bio_addr_copy(BIO_ADDR *dst, BIO_ADDR *src)
+{
+    size_t len;
+    void *data = NULL;
+    int res = 0;
+    int family;
+
+    if (src == NULL || dst == NULL)
+        return 0;
+
+    family = BIO_ADDR_family(src);
+    if (family == AF_UNSPEC) {
+        BIO_ADDR_clear(dst);
+        return 1;
+    }
+
+    if (!BIO_ADDR_rawaddress(src, NULL, &len))
+        return 0;
+
+    if (len > 0) {
+        data = OPENSSL_malloc(len);
+        if (!TEST_ptr(data))
+            return 0;
+    }
+
+    if (!BIO_ADDR_rawaddress(src, data, &len))
+        goto err;
+
+    if (!BIO_ADDR_rawmake(src, family, data, len, BIO_ADDR_rawport(src)))
+        goto err;
+
+    res = 1;
+ err:
+    OPENSSL_free(data);
+    return res;
+}
+
+int bio_msg_copy(BIO_MSG *dst, BIO_MSG *src)
+{
+    /*
+     * Note it is assumed that the originally allocated data sizes for dst and
+     * src are the same
+     */
+    memcpy(dst->data, src->data, src->data_len);
+    dst->data_len = src->data_len;
+    dst->flags = src->flags;
+    if (dst->local != NULL) {
+        if (src->local != NULL) {
+            if (!TEST_true(bio_addr_copy(dst->local, src->local)))
+                return 0;
+        } else {
+            BIO_ADDR_clear(dst->local);
+        }
+    }
+    if (!TEST_true(bio_addr_copy(dst->peer, src->peer)))
+        return 0;
+
+    return 1;
+}