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/* seterror.c - sasl_seterror split out because glue libraries
* can't pass varargs lists
* Rob Siemborski
* Tim Martin
* split from common.c by Rolf Braun
*/
/*
* Copyright (c) 1998-2016 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any other legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#ifdef HAVE_SYSLOG
#include <syslog.h>
#endif
#include <stdarg.h>
#include <ctype.h>
#include <sasl.h>
#include <saslutil.h>
#include <saslplug.h>
#include "saslint.h"
#ifdef WIN32
/* need to handle the fact that errno has been defined as a function
in a dll, not an extern int */
# ifdef errno
# undef errno
# endif /* errno */
#endif /* WIN32 */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
/* this is apparently no longer a user function */
static int _sasl_seterror_usererr(int saslerr)
{
/* Hide the difference in a username failure and a password failure */
if (saslerr == SASL_NOUSER)
return SASL_BADAUTH;
/* otherwise return the error given; no transform necessary */
return saslerr;
}
/* set the error string which will be returned by sasl_errdetail() using
* syslog()-style formatting (e.g. printf-style with %m as the string form
* of an errno error)
*
* primarily for use by server callbacks such as the sasl_authorize_t
* callback and internally to plug-ins
*
* This will also trigger a call to the SASL logging callback (if any)
* with a level of SASL_LOG_FAIL unless the SASL_NOLOG flag is set.
*
* Messages should be sensitive to the current language setting. If there
* is no SASL_CB_LANGUAGE callback messages MUST be US-ASCII otherwise UTF-8
* is used and use of RFC 2482 for mixed-language text is encouraged.
*
* if conn is NULL, function does nothing
*/
void sasl_seterror(sasl_conn_t *conn,
unsigned flags,
const char *fmt, ...)
{
size_t outlen=0; /* current length of output buffer */
size_t pos = 0; /* current position in format string */
size_t formatlen;
int result;
sasl_log_t *log_cb = NULL;
void *log_ctx;
int ival;
char *cval;
va_list ap; /* varargs thing */
char **error_buf;
size_t *error_buf_len;
if(!conn) {
#ifndef SASL_OSX_CFMGLUE
if(!(flags & SASL_NOLOG)) {
/* See if we have a logging callback... */
result = _sasl_getcallback(NULL, SASL_CB_LOG, (sasl_callback_ft *)&log_cb, &log_ctx);
if (result == SASL_OK && ! log_cb)
result = SASL_FAIL;
if (result != SASL_OK)
return;
log_cb(log_ctx, SASL_LOG_FAIL,
"No sasl_conn_t passed to sasl_seterror");
}
#endif /* SASL_OSX_CFMGLUE */
return;
} else if(!fmt) return;
/* we need to use a back end function to get the buffer because the
cfm glue can't be rooting around in the internal structs */
_sasl_get_errorbuf(conn, &error_buf, &error_buf_len);
formatlen = strlen(fmt);
va_start(ap, fmt); /* start varargs */
while(pos<formatlen)
{
if (fmt[pos]!='%') /* regular character */
{
result = _buf_alloc(error_buf, error_buf_len, outlen+1);
if (result != SASL_OK)
goto done;
(*error_buf)[outlen]=fmt[pos];
outlen++;
pos++;
} else { /* formating thing */
int done=0;
char frmt[10];
int frmtpos=1;
char tempbuf[21];
frmt[0]='%';
pos++;
while (done==0)
{
switch(fmt[pos])
{
case 's': /* need to handle this */
cval = va_arg(ap, char *); /* get the next arg */
result = _sasl_add_string(error_buf, error_buf_len,
&outlen, cval);
if (result != SASL_OK) /* add the string */
goto done;
done=1;
break;
case '%': /* double % output the '%' character */
result = _buf_alloc(error_buf, error_buf_len, outlen+1);
if (result != SASL_OK)
goto done;
(*error_buf)[outlen]='%';
outlen++;
done=1;
break;
case 'm': /* insert the errno string */
result = _sasl_add_string(error_buf, error_buf_len,
&outlen,
strerror(va_arg(ap, int)));
if (result != SASL_OK)
goto done;
done=1;
break;
case 'z': /* insert the sasl error string */
result = _sasl_add_string(error_buf, error_buf_len, &outlen,
(char *)sasl_errstring(_sasl_seterror_usererr(
va_arg(ap, int)),NULL,NULL));
if (result != SASL_OK)
goto done;
done=1;
break;
case 'c':
frmt[frmtpos++]=fmt[pos];
frmt[frmtpos]=0;
tempbuf[0] = (char) va_arg(ap, int); /* get the next arg */
tempbuf[1]='\0';
/* now add the character */
result = _sasl_add_string(error_buf, error_buf_len,
&outlen, tempbuf);
if (result != SASL_OK)
goto done;
done=1;
break;
case 'd':
case 'i':
frmt[frmtpos++]=fmt[pos];
frmt[frmtpos]=0;
ival = va_arg(ap, int); /* get the next arg */
snprintf(tempbuf,20,frmt,ival); /* have snprintf do the work */
/* now add the string */
result = _sasl_add_string(error_buf, error_buf_len,
&outlen, tempbuf);
if (result != SASL_OK)
goto done;
done=1;
break;
default:
frmt[frmtpos++]=fmt[pos]; /* add to the formating */
frmt[frmtpos]=0;
if (frmtpos>9)
done=1;
}
pos++;
if (pos>formatlen)
done=1;
}
}
}
(*error_buf)[outlen]='\0'; /* put 0 at end */
#ifndef SASL_OSX_CFMGLUE
if(!(flags & SASL_NOLOG)) {
/* See if we have a logging callback... */
result = _sasl_getcallback(conn, SASL_CB_LOG, (sasl_callback_ft *)&log_cb, &log_ctx);
if (result == SASL_OK && ! log_cb)
result = SASL_FAIL;
if (result != SASL_OK)
goto done;
result = log_cb(log_ctx, SASL_LOG_FAIL, conn->error_buf);
}
#endif /* SASL_OSX_CFMGLUE */
done:
va_end(ap);
}
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