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.. highlightlang:: c
.. _krb5-pre-send-fn-struct:
krb5_pre_send_fn
================
..
.. c:type:: krb5_pre_send_fn
..
Hook function for inspecting or modifying messages sent to KDCs.
If the hook function sets *reply_out* , *message* will not be sent to the KDC, and the given reply will used instead.
If the hook function sets *new_message_out* , the given message will be sent to the KDC in place of *message* .
If the hook function returns successfully without setting either output, *message* will be sent to the KDC normally.
The hook function should use :c:func:`krb5_copy_data()` to construct the value for *new_message_out* or *reply_out* , to ensure that it can be freed correctly by the library.
Declaration
------------
typedef krb5_error_code( \* krb5_pre_send_fn)(krb5_context context, void \*data, const krb5_data \*realm, const krb5_data \*message, krb5_data \*\*new_message_out, krb5_data \*\*new_reply_out)
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