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 #undef __attribute__
  37 #define __attribute__(x)
  38
  39 /**
  40  * Clears the error message from the Kerberos 5 context.
  41  *
  42  * @param context The Kerberos 5 context to clear
  43  *
  44  * @ingroup krb5_error
  45  */
  46
  47 void KRB5_LIB_FUNCTION
  48 krb5_clear_error_message(krb5_context context)
  49 {
  50     HEIMDAL_MUTEX_lock(context->mutex);
  51     if (context->error_string)
  52         free(context->error_string);
  53     context->error_code = 0;
  54     context->error_string = NULL;
  55     HEIMDAL_MUTEX_unlock(context->mutex);
  56 }
  57
  58 /**
  59  * Set the context full error string for a specific error code.
  60  * The error that is stored should be internationalized.
  61  *
  62  * @param context Kerberos 5 context
  63  * @param ret The error code
  64  * @param fmt Error string for the error code
  65  * @param ... printf(3) style parameters.
  66  *
  67  * @ingroup krb5_error
  68  */
  69
  70 void KRB5_LIB_FUNCTION
  71 krb5_set_error_message(krb5_context context, krb5_error_code ret,
  72                        const char *fmt, ...)
  73     __attribute__ ((format (printf, 3, 4)))
  74 {
  75     va_list ap;
  76
  77     va_start(ap, fmt);
  78     krb5_vset_error_message (context, ret, fmt, ap);
  79     va_end(ap);
  80 }
  81
  82 /**
  83  * Set the context full error string for a specific error code.
  84  *
  85  * @param context Kerberos 5 context
  86  * @param ret The error code
  87  * @param fmt Error string for the error code
  88  * @param args printf(3) style parameters.
  89  *
  90  * @ingroup krb5_error
  91  */
  92
  93
  94 void KRB5_LIB_FUNCTION
  95 krb5_vset_error_message (krb5_context context, krb5_error_code ret,
  96                          const char *fmt, va_list args)
  97     __attribute__ ((format (printf, 3, 0)))
  98 {
  99
 100     krb5_clear_error_message(context);
 101     HEIMDAL_MUTEX_lock(context->mutex);
 102     context->error_code = ret;
 103     vasprintf(&context->error_string, fmt, args);
 104     HEIMDAL_MUTEX_unlock(context->mutex);
 105 }
 106
 107
 108 /**
 109  * Return the error message in context. On error or no error string,
 110  * the function returns NULL.
 111  *
 112  * @param context Kerberos 5 context
 113  *
 114  * @return an error string, needs to be freed with
 115  * krb5_free_error_message(). The functions return NULL on error.
 116  *
 117  * @ingroup krb5_error
 118  */
 119
 120 char * KRB5_LIB_FUNCTION
 121 krb5_get_error_string(krb5_context context)
 122 {
 123     char *ret = NULL;
 124
 125     HEIMDAL_MUTEX_lock(context->mutex);
 126     if (context->error_string)
 127         ret = strdup(context->error_string);
 128     HEIMDAL_MUTEX_unlock(context->mutex);
 129     return ret;
 130 }
 131
 132 krb5_boolean KRB5_LIB_FUNCTION
 133 krb5_have_error_string(krb5_context context)
 134 {
 135     char *str;
 136     HEIMDAL_MUTEX_lock(context->mutex);
 137     str = context->error_string;
 138     HEIMDAL_MUTEX_unlock(context->mutex);
 139     return str != NULL;
 140 }
 141
 142 /**
 143  * Return the error message for `code' in context. On memory
 144  * allocation error the function returns NULL.
 145  *
 146  * @param context Kerberos 5 context
 147  * @param code Error code related to the error
 148  *
 149  * @return an error string, needs to be freed with
 150  * krb5_free_error_message(). The functions return NULL on error.
 151  *
 152  * @ingroup krb5_error
 153  */
 154
 155 const char * KRB5_LIB_FUNCTION
 156 krb5_get_error_message(krb5_context context, krb5_error_code code)
 157 {
 158     const char *cstr;
 159     char *str;
 160
 161     HEIMDAL_MUTEX_lock(context->mutex);
 162     if (context->error_string &&
 163         (code == context->error_code || context->error_code == 0))
 164     {
 165         str = strdup(context->error_string);
 166         if (str) {
 167             HEIMDAL_MUTEX_unlock(context->mutex);
 168             return str;
 169         }
 170     }
 171     HEIMDAL_MUTEX_unlock(context->mutex);
 172
 173     if (code == 0)
 174         return strdup("Success");
 175
 176     cstr = krb5_get_err_text(context, code);
 177     if (cstr)
 178         return strdup(cstr);
 179
 180     if (asprintf(&str, "<unknown error: %d>", (int)code) == -1)
 181         return NULL;
 182
 183     return str;
 184 }
 185
 186
 187 /**
 188  * Free the error message returned by krb5_get_error_message().
 189  *
 190  * @param context Kerberos context
 191  * @param msg error message to free, returned byg
 192  *        krb5_get_error_message().
 193  *
 194  * @ingroup krb5_error
 195  */
 196
 197 void KRB5_LIB_FUNCTION
 198 krb5_free_error_message(krb5_context context, const char *msg)
 199 {
 200     free(rk_UNCONST(msg));
 201 }