lib/krb5/error_string.c

   1 /*
   2  * Copyright (c) 2001, 2003, 2005 - 2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "krb5_locl.h"
  35
  36 RCSID("$Id$");
  37
  38 #undef __attribute__
  39 #define __attribute__(X)
  40
  41 void KRB5_LIB_FUNCTION
  42 krb5_free_error_string(krb5_context context, char *str)
  43 {
  44     HEIMDAL_MUTEX_lock(context->mutex);
  45     if (str != context->error_buf)
  46         free(str);
  47     HEIMDAL_MUTEX_unlock(context->mutex);
  48 }
  49
  50 void KRB5_LIB_FUNCTION
  51 krb5_clear_error_string(krb5_context context)
  52 {
  53     HEIMDAL_MUTEX_lock(context->mutex);
  54     if (context->error_string != NULL
  55         && context->error_string != context->error_buf)
  56         free(context->error_string);
  57     context->error_string = NULL;
  58     HEIMDAL_MUTEX_unlock(context->mutex);
  59 }
  60
  61 krb5_error_code KRB5_LIB_FUNCTION
  62 krb5_set_error_string(krb5_context context, const char *fmt, ...)
  63     __attribute__((format (printf, 2, 3)))
  64 {
  65     krb5_error_code ret;
  66     va_list ap;
  67
  68     va_start(ap, fmt);
  69     ret = krb5_vset_error_string (context, fmt, ap);
  70     va_end(ap);
  71     return ret;
  72 }
  73
  74 krb5_error_code KRB5_LIB_FUNCTION
  75 krb5_vset_error_string(krb5_context context, const char *fmt, va_list args)
  76     __attribute__ ((format (printf, 2, 0)))
  77 {
  78     krb5_clear_error_string(context);
  79     HEIMDAL_MUTEX_lock(context->mutex);
  80     vasprintf(&context->error_string, fmt, args);
  81     if(context->error_string == NULL) {
  82         vsnprintf (context->error_buf, sizeof(context->error_buf), fmt, args);
  83         context->error_string = context->error_buf;
  84     }
  85     HEIMDAL_MUTEX_unlock(context->mutex);
  86     return 0;
  87 }
  88
  89 /**
  90  * Return the error message in context. On error or no error string,
  91  * the function returns NULL.
  92  *
  93  * @param context Kerberos 5 context
  94  *
  95  * @return an error string, needs to be freed with
  96  * krb5_free_error_string(). The functions return NULL on error.
  97  *
  98  * @ingroup krb5_error
  99  */
 100
 101 char * KRB5_LIB_FUNCTION
 102 krb5_get_error_string(krb5_context context)
 103 {
 104     char *ret = NULL;
 105
 106     HEIMDAL_MUTEX_lock(context->mutex);
 107     if (context->error_string)
 108         ret = strdup(context->error_string);
 109     HEIMDAL_MUTEX_unlock(context->mutex);
 110     return ret;
 111 }
 112
 113 krb5_boolean KRB5_LIB_FUNCTION
 114 krb5_have_error_string(krb5_context context)
 115 {
 116     char *str;
 117     HEIMDAL_MUTEX_lock(context->mutex);
 118     str = context->error_string;
 119     HEIMDAL_MUTEX_unlock(context->mutex);
 120     return str != NULL;
 121 }
 122
 123 /**
 124  * Return the error message for `code' in context. On error the
 125  * function returns NULL.
 126  *
 127  * @param context Kerberos 5 context
 128  * @param code Error code related to the error
 129  *
 130  * @return an error string, needs to be freed with
 131  * krb5_free_error_string(). The functions return NULL on error.
 132  *
 133  * @ingroup krb5_error
 134  */
 135
 136 char * KRB5_LIB_FUNCTION
 137 krb5_get_error_message(krb5_context context, krb5_error_code code)
 138 {
 139     const char *cstr;
 140     char *str;
 141
 142     str = krb5_get_error_string(context);
 143     if (str)
 144         return str;
 145
 146     cstr = krb5_get_err_text(context, code);
 147     if (cstr)
 148         return strdup(cstr);
 149
 150     if (asprintf(&str, "<unknown error: %d>", (int)code) == -1)
 151         return NULL;
 152
 153     return str;
 154 }
 155