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/* acct_r.c - Read accounting reply from server.
*
* Copyright (C) 2010, Pawel Krawczyk <pawel.krawczyk@hush.com> and
* Jeroen Nijhof <jeroen@jeroennijhof.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 "xalloc.h"
#include "libtac.h"
#include "messages.h"
/*
* return value:
* < 0 : error status code, see LIBTAC_STATUS_...
* LIBTAC_STATUS_READ_TIMEOUT
* LIBTAC_STATUS_SHORT_HDR
* LIBTAC_STATUS_SHORT_BODY
* LIBTAC_STATUS_PROTOCOL_ERR
* >= 0 : server response, see TAC_PLUS_AUTHEN_STATUS_...
*/
int tac_acct_read(int fd, struct areply *re) {
HDR th;
struct acct_reply *tb = NULL;
int len_from_header, r, len_from_body;
char *msg = NULL;
int timeleft;
re->attr = NULL; /* unused */
re->msg = NULL;
if (tac_readtimeout_enable &&
tac_read_wait(fd,tac_timeout*1000, TAC_PLUS_HDR_SIZE,&timeleft) < 0 ) {
TACSYSLOG((LOG_ERR,\
"%s: reply timeout after %d secs", __FUNCTION__, tac_timeout))
re->msg = xstrdup(acct_syserr_msg);
re->status = LIBTAC_STATUS_READ_TIMEOUT;
free(tb);
return re->status;
}
r=read(fd, &th, TAC_PLUS_HDR_SIZE);
if(r < TAC_PLUS_HDR_SIZE) {
TACSYSLOG((LOG_ERR,\
"%s: short reply header, read %d of %d: %m", __FUNCTION__,\
r, TAC_PLUS_HDR_SIZE))
re->msg = xstrdup(acct_syserr_msg);
re->status = LIBTAC_STATUS_SHORT_HDR;
free(tb);
return re->status;
}
/* check the reply fields in header */
msg = _tac_check_header(&th, TAC_PLUS_ACCT);
if(msg != NULL) {
re->msg = xstrdup(msg);
re->status = LIBTAC_STATUS_PROTOCOL_ERR;
free(tb);
TACDEBUG((LOG_DEBUG, "%s: exit status=%d, status message \"%s\"",\
__FUNCTION__, re->status, re->msg != NULL ? re->msg : ""))
return re->status;
}
len_from_header=ntohl(th.datalength);
tb=(struct acct_reply *) xcalloc(1, len_from_header);
/* read reply packet body */
if (tac_readtimeout_enable &&
tac_read_wait(fd,timeleft,len_from_header,NULL) < 0 ) {
TACSYSLOG((LOG_ERR,\
"%s: reply timeout after %d secs", __FUNCTION__, tac_timeout))
re->msg = xstrdup(acct_syserr_msg);
re->status = LIBTAC_STATUS_READ_TIMEOUT;
free(tb);
return re->status;
}
r=read(fd, tb, len_from_header);
if(r < len_from_header) {
TACSYSLOG((LOG_ERR,\
"%s: short reply body, read %d of %d: %m",\
__FUNCTION__,\
r, len_from_header))
re->msg = xstrdup(acct_syserr_msg);
re->status = LIBTAC_STATUS_SHORT_BODY;
free(tb);
return re->status;
}
/* decrypt the body */
_tac_crypt((u_char *) tb, &th, len_from_header);
/* Convert network byte order to host byte order */
tb->msg_len = ntohs(tb->msg_len);
tb->data_len = ntohs(tb->data_len);
/* check the length fields */
len_from_body=sizeof(tb->msg_len) + sizeof(tb->data_len) +
sizeof(tb->status) + tb->msg_len + tb->data_len;
if(len_from_header != len_from_body) {
TACSYSLOG((LOG_ERR,\
"%s: inconsistent reply body, incorrect key?",\
__FUNCTION__))
re->msg = xstrdup(acct_syserr_msg);
re->status = LIBTAC_STATUS_PROTOCOL_ERR;
free(tb);
return re->status;
}
/* save status and clean up */
r=tb->status;
if(tb->msg_len) {
msg=(char *) xcalloc(1, tb->msg_len+1);
bcopy((u_char *) tb+TAC_ACCT_REPLY_FIXED_FIELDS_SIZE, msg, tb->msg_len);
msg[(int)tb->msg_len] = '\0';
re->msg = msg; // Freed by caller
}
/* server logged our request successfully */
if (tb->status == TAC_PLUS_ACCT_STATUS_SUCCESS) {
TACDEBUG((LOG_DEBUG, "%s: accounted ok", __FUNCTION__))
if (!re->msg) re->msg = xstrdup(acct_ok_msg);
re->status = tb->status;
free(tb);
return re->status;
}
TACDEBUG((LOG_DEBUG, "%s: accounting failed, server reply status=%d",\
__FUNCTION__, tb->status))
switch(tb->status) {
case TAC_PLUS_ACCT_STATUS_FOLLOW:
re->status = tb->status;
if (!re->msg) re->msg=xstrdup(acct_fail_msg);
break;
case TAC_PLUS_ACCT_STATUS_ERROR:
default:
re->status = tb->status;
if (!re->msg) re->msg=xstrdup(acct_err_msg);
break;
}
free(tb);
return re->status;
}
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