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/* $Id$
*
* Error handling for Kerberos v5.
*
* Provides versions of die and warn that take a Kerberos context and a
* Kerberos error code and append the Kerberos error message to the provided
* formatted message.
*
* Written by Russ Allbery <rra@stanford.edu>
* Copyright 2006, 2007, 2008
* Board of Trustees, Leland Stanford Jr. University
*
* See LICENSE for licensing terms.
*/
#include <config.h>
#include <portable/system.h>
#include <krb5.h>
#if !defined(HAVE_KRB5_GET_ERROR_MESSAGE) && !defined(HAVE_KRB5_GET_ERR_TEXT)
# if defined(HAVE_IBM_SVC_KRB5_SVC_H)
# include <ibm_svc/krb5_svc.h>
# elif defined(HAVE_ET_COM_ERR_H)
# include <et/com_err.h>
# else
# include <com_err.h>
# endif
#endif
#include <util/util.h>
/*
* This string is returned for unknown error messages. We use a static
* variable so that we can be sure not to free it.
*/
static const char error_unknown[] = "unknown error";
/*
* Given a Kerberos error code, return the corresponding error. Prefer the
* Kerberos interface if available since it will provide context-specific
* error information, whereas the error_message() call will only provide a
* fixed message.
*/
static const char *
get_error(krb5_context ctx UNUSED, krb5_error_code code)
{
const char *msg = NULL;
#if defined(HAVE_KRB5_GET_ERROR_MESSAGE)
msg = krb5_get_error_message(ctx, code);
#elif defined(HAVE_KRB5_GET_ERR_TEXT)
msg = krb5_get_err_text(ctx, code);
#elif defined(HAVE_KRB5_SVC_GET_MSG)
krb5_svc_get_msg(code, &msg);
#else
msg = error_message(code);
#endif
if (msg == NULL)
return error_unknown;
else
return msg;
}
/*
* Free an error string if necessary.
*/
static void
free_error(krb5_context ctx UNUSED, const char *msg)
{
if (msg == error_unknown)
return;
#if defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
krb5_free_error_message(ctx, msg);
#elif defined(HAVE_KRB5_SVC_GET_MSG)
krb5_free_string((char *) msg);
#endif
}
/*
* Report a Kerberos error and exit.
*/
void
die_krb5(krb5_context ctx, krb5_error_code code, const char *format, ...)
{
const char *k5_msg = NULL;
char *message;
va_list args;
k5_msg = get_error(ctx, code);
va_start(args, format);
if (xvasprintf(&message, format, args) < 0)
die("internal error: unable to format error message");
va_end(args);
die("%s: %s", message, k5_msg);
}
/*
* Report a Kerberos error.
*/
void
warn_krb5(krb5_context ctx, krb5_error_code code, const char *format, ...)
{
const char *k5_msg = NULL;
char *message;
va_list args;
k5_msg = get_error(ctx, code);
va_start(args, format);
if (xvasprintf(&message, format, args) < 0)
die("internal error: unable to format error message");
va_end(args);
warn("%s: %s", message, k5_msg);
free(message);
free_error(ctx, k5_msg);
}
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