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/* header.c - Create pre-filled header for TACACS+ request.
*
* Copyright (C) 2010, Pawel Krawczyk <pawel.krawczyk@hush.com> and
* Jeroen Nijhof <jeroen@nijhofnet.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program - see the file COPYING.
*
* See `CHANGES' file for revision history.
*/
#include "tacplus.h"
#include "libtac.h"
#include "xalloc.h"
#include "magic.h"
/* Miscellaneous variables that are global, because we need
* store their values between different functions and connections.
*/
/* Session identifier. */
int session_id;
/* Encryption flag. */
int tac_encryption = 0;
/* Pointer to TACACS+ shared secret string. */
char *tac_secret = "";
/* Pointer to TACACS+ shared login string. */
char *tac_login = "pap";
/* priv_lvl */
int tac_priv_lvl = TAC_PLUS_PRIV_LVL_MIN;
/* Authentication Method */
int tac_authen_method = TAC_PLUS_AUTHEN_METH_TACACSPLUS;
/* Service requesting authentication */
int tac_authen_service = TAC_PLUS_AUTHEN_SVC_PPP;
/* additional runtime flags */
int tac_debug_enable = 0;
int tac_readtimeout_enable = 0;
/* Returns pre-filled TACACS+ packet header of given type.
* 1. you MUST fill th->datalength and th->version
* 2. you MAY fill th->encryption
* 3. you are responsible for freeing allocated header
* By default packet encryption is enabled. The version
* field depends on the TACACS+ request type and thus it
* cannot be predefined.
*/
HDR *_tac_req_header(u_char type, int cont_session) {
HDR *th;
th=(HDR *) xcalloc(1, TAC_PLUS_HDR_SIZE);
/* preset some packet options in header */
th->type=type;
th->seq_no=1; /* always 1 for request */
th->encryption=TAC_PLUS_ENCRYPTED_FLAG;
/* make session_id from pseudo-random number */
if (!cont_session)
session_id = magic();
th->session_id = htonl(session_id);
return(th);
}
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