# MIT Kerberos Documentation

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# krb5_tkt_creds_step - Get the next KDC request in a TGS exchange.

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)

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

retval: | 0 Success; otherwise - Kerberos error codes

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 `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 `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.

Note

New in 1.9