tests: add sftp server test

Signed-off-by: tatataeki <shengzeyu19_98@163.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>

tests/server/test_server/CMakeLists.txt

@@ -10,7 +10,8 @@ set(server_SRCS
 
 add_library(testserver STATIC
             test_server.c
-            default_cb.c)
+            default_cb.c
+            sftpserver_cb.c)
 
 set(LIBSSH_SERVER_TESTS
 #    torture_server_kbdint

tests/server/test_server/default_cb.h

@@ -24,6 +24,7 @@
 #include "config.h"
 
 #include <libssh/libssh.h>
+#include <libssh/sftp.h>
 #include <libssh/callbacks.h>
 
 #define SSHD_DEFAULT_USER "libssh"
@@ -70,6 +71,7 @@ struct channel_data_st {
     void *server_state;
     /* This pointer is useful to set data for custom callbacks */
     void *extra_data;
+    sftp_session sftp;
 };
 
 /* A userdata struct for session. */