+int
+ssh_update_card(AuthenticationConnection *auth, int add,
+ const char *reader_id, const char *pin, u_int life, u_int confirm)
+{
+ Buffer msg;
+ int type, constrained = (life || confirm);
+
+ if (add) {
+ type = constrained ?
+ SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED :
+ SSH_AGENTC_ADD_SMARTCARD_KEY;
+ } else
+ type = SSH_AGENTC_REMOVE_SMARTCARD_KEY;
+
+ buffer_init(&msg);
+ buffer_put_char(&msg, type);
+ buffer_put_cstring(&msg, reader_id);
+ buffer_put_cstring(&msg, pin);
+
+ if (constrained) {
+ if (life != 0) {
+ buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME);
+ buffer_put_int(&msg, life);
+ }
+ if (confirm != 0)
+ buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM);
+ }
+
+ if (ssh_request_reply(auth, &msg, &msg) == 0) {
+ buffer_free(&msg);
+ return 0;
+ }
+ type = buffer_get_char(&msg);
+ buffer_free(&msg);
+ return decode_reply(type);
+}
+