OpenSSL::X509::StoreContext#chain

static VALUE
ossl_x509stctx_get_chain(VALUE self)
{
    X509_STORE_CTX *ctx;
    const STACK_OF(X509) *chain;

    GetX509StCtx(self, ctx);
    chain = X509_STORE_CTX_get0_chain(ctx);
    if (!chain)
        return Qnil; /* Could be an empty array instead? */
    return ossl_x509_sk2ary(chain);
}