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 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
  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 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
  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 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
  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     int r;
 100
 101     HEIMDAL_MUTEX_lock(context->mutex);
 102     if (context->error_string) {
 103         free(context->error_string);
 104         context->error_string = NULL;
 105     }
 106     context->error_code = ret;
 107     r = vasprintf(&context->error_string, fmt, args);
 108     if (r < 0)
 109         context->error_string = NULL;
 110     HEIMDAL_MUTEX_unlock(context->mutex);
 111 }
 112
 113 /**
 114  * Prepend the context full error string for a specific error code.
 115  * The error that is stored should be internationalized.
 116  *
 117  * @param context Kerberos 5 context
 118  * @param ret The error code
 119  * @param fmt Error string for the error code
 120  * @param ... printf(3) style parameters.
 121  *
 122  * @ingroup krb5_error
 123  */
 124
 125 void KRB5_LIB_FUNCTION
 126 krb5_prepend_error_message(krb5_context context, krb5_error_code ret,
 127                            const char *fmt, ...)
 128     __attribute__ ((format (printf, 3, 4)))
 129 {
 130     va_list ap;
 131
 132     va_start(ap, fmt);
 133     krb5_vprepend_error_message(context, ret, fmt, ap);
 134     va_end(ap);
 135 }
 136
 137 /**
 138  * Prepend the contexts's full error string for a specific error code.
 139  *
 140  * @param context Kerberos 5 context
 141  * @param ret The error code
 142  * @param fmt Error string for the error code
 143  * @param args printf(3) style parameters.
 144  *
 145  * @ingroup krb5_error
 146  */
 147
 148 void KRB5_LIB_FUNCTION
 149 krb5_vprepend_error_message(krb5_context context, krb5_error_code ret,
 150                             const char *fmt, va_list args)
 151     __attribute__ ((format (printf, 3, 0)))
 152 {
 153     char *str = NULL, *str2 = NULL;
 154     HEIMDAL_MUTEX_lock(context->mutex);
 155     if (context->error_code != ret) {
 156         HEIMDAL_MUTEX_unlock(context->mutex);
 157         return;
 158     }
 159     if (vasprintf(&str, fmt, args) < 0 || str == NULL) {
 160         HEIMDAL_MUTEX_unlock(context->mutex);
 161         return;
 162     }
 163     if (context->error_string) {
 164         int e;
 165
 166         e = asprintf(&str2, "%s: %s", str, context->error_string);
 167         free(context->error_string);
 168         if (e < 0 || str2 == NULL)
 169             context->error_string = NULL;
 170         else
 171             context->error_string = str2;
 172         free(str);
 173     } else
 174         context->error_string = str;
 175     HEIMDAL_MUTEX_unlock(context->mutex);
 176 }
 177
 178
 179 /**
 180  * Return the error message in context. On error or no error string,
 181  * the function returns NULL.
 182  *
 183  * @param context Kerberos 5 context
 184  *
 185  * @return an error string, needs to be freed with
 186  * krb5_free_error_message(). The functions return NULL on error.
 187  *
 188  * @ingroup krb5_error
 189  */
 190
 191 KRB5_LIB_FUNCTION char * KRB5_LIB_CALL
 192 krb5_get_error_string(krb5_context context)
 193 {
 194     char *ret = NULL;
 195
 196     HEIMDAL_MUTEX_lock(context->mutex);
 197     if (context->error_string)
 198         ret = strdup(context->error_string);
 199     HEIMDAL_MUTEX_unlock(context->mutex);
 200     return ret;
 201 }
 202
 203 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
 204 krb5_have_error_string(krb5_context context)
 205 {
 206     char *str;
 207     HEIMDAL_MUTEX_lock(context->mutex);
 208     str = context->error_string;
 209     HEIMDAL_MUTEX_unlock(context->mutex);
 210     return str != NULL;
 211 }
 212
 213 /**
 214  * Return the error message for `code' in context. On memory
 215  * allocation error the function returns NULL.
 216  *
 217  * @param context Kerberos 5 context
 218  * @param code Error code related to the error
 219  *
 220  * @return an error string, needs to be freed with
 221  * krb5_free_error_message(). The functions return NULL on error.
 222  *
 223  * @ingroup krb5_error
 224  */
 225
 226 KRB5_LIB_FUNCTION const char * KRB5_LIB_CALL
 227 krb5_get_error_message(krb5_context context, krb5_error_code code)
 228 {
 229     char *str;
 230
 231     HEIMDAL_MUTEX_lock(context->mutex);
 232     if (context->error_string &&
 233         (code == context->error_code || context->error_code == 0))
 234     {
 235         str = strdup(context->error_string);
 236         if (str) {
 237             HEIMDAL_MUTEX_unlock(context->mutex);
 238             return str;
 239         }
 240     }
 241     HEIMDAL_MUTEX_unlock(context->mutex);
 242
 243     if (code == 0)
 244         return strdup("Success");
 245     {
 246         const char *msg;
 247         char buf[128];
 248         msg = com_right_r(context->et_list, code, buf, sizeof(buf));
 249         if (msg)
 250             return strdup(msg);
 251     }
 252
 253     if (asprintf(&str, "<unknown error: %d>", (int)code) == -1 || str == NULL)
 254         return NULL;
 255
 256     return str;
 257 }
 258
 259
 260 /**
 261  * Free the error message returned by krb5_get_error_message().
 262  *
 263  * @param context Kerberos context
 264  * @param msg error message to free, returned byg
 265  *        krb5_get_error_message().
 266  *
 267  * @ingroup krb5_error
 268  */
 269
 270 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
 271 krb5_free_error_message(krb5_context context, const char *msg)
 272 {
 273     free(rk_UNCONST(msg));
 274 }
 275
 276
 277 /**
 278  * Return the error string for the error code. The caller must not
 279  * free the string.
 280  *
 281  * This function is deprecated since its not threadsafe.
 282  *
 283  * @param context Kerberos 5 context.
 284  * @param code Kerberos error code.
 285  *
 286  * @return the error message matching code
 287  *
 288  * @ingroup krb5
 289  */
 290
 291 KRB5_DEPRECATED
 292 KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
 293 krb5_get_err_text(krb5_context context, krb5_error_code code)
 294 {
 295     const char *p = NULL;
 296     if(context != NULL)
 297         p = com_right(context->et_list, code);
 298     if(p == NULL)
 299         p = strerror(code);
 300     if (p == NULL)
 301         p = "Unknown error";
 302     return p;
 303 }