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krb5_tkt_creds_step - Get the next KDC request in a TGS exchange.
===================================================================
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.. c:function:: krb5_error_code krb5_tkt_creds_step(krb5_context context, krb5_tkt_creds_context ctx, krb5_data * in, krb5_data * out, krb5_data * realm, unsigned int * flags)
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:param:
**[in]** **context** - Library context
**[in]** **ctx** - TGS request context
**[in]** **in** - KDC response (empty on the first call)
**[out]** **out** - Next KDC request
**[out]** **realm** - Realm for next KDC request
**[out]** **flags** - Output flags
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:retval:
- 0 Success; otherwise - Kerberos error codes
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This function constructs the next KDC request for a TGS exchange, allowing the caller to control the transport of KDC requests and replies. On the first call, *in* should be set to an empty buffer; on subsequent calls, it should be set to the KDC's reply to the previous request.
If more requests are needed, *flags* will be set to :data:`KRB5_TKT_CREDS_STEP_FLAG_CONTINUE` and the next request will be placed in *out* . If no more requests are needed, *flags* will not contain :data:`KRB5_TKT_CREDS_STEP_FLAG_CONTINUE` and *out* will be empty.
If this function returns **KRB5KRB_ERR_RESPONSE_TOO_BIG** , the caller should transmit the next request using TCP rather than UDP. If this function returns any other error, the TGS exchange has failed.
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.. note::
New in 1.9
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