lib/hx509/error.c

   1 /*
   2  * Copyright (c) 2006 - 2007 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 "hx_locl.h"
  35 RCSID("$Id$");
  36
  37 /**
  38  * @page page_error Hx509 error reporting functions
  39  *
  40  * See the library functions here: @ref hx509_error
  41  */
  42
  43 struct hx509_error_data {
  44     hx509_error next;
  45     int code;
  46     char *msg;
  47 };
  48
  49 static void
  50 free_error_string(hx509_error msg)
  51 {
  52     while(msg) {
  53         hx509_error m2 = msg->next;
  54         free(msg->msg);
  55         free(msg);
  56         msg = m2;
  57     }
  58 }
  59
  60 /**
  61  * Resets the error strings the hx509 context.
  62  *
  63  * @param context A hx509 context.
  64  *
  65  * @ingroup hx509_error
  66  */
  67
  68 void
  69 hx509_clear_error_string(hx509_context context)
  70 {
  71     free_error_string(context->error);
  72     context->error = NULL;
  73 }
  74
  75 /**
  76  * Add an error message to the hx509 context.
  77  *
  78  * @param context A hx509 context.
  79  * @param flags
  80  * - HX509_ERROR_APPEND appends the error string to the old messages
  81      (code is updated).
  82  * @param code error code related to error message
  83  * @param fmt error message format
  84  * @param ap arguments to error message format
  85  *
  86  * @ingroup hx509_error
  87  */
  88
  89 void
  90 hx509_set_error_stringv(hx509_context context, int flags, int code,
  91                         const char *fmt, va_list ap)
  92 {
  93     hx509_error msg;
  94
  95     msg = calloc(1, sizeof(*msg));
  96     if (msg == NULL) {
  97         hx509_clear_error_string(context);
  98         return;
  99     }
 100
 101     if (vasprintf(&msg->msg, fmt, ap) == -1) {
 102         hx509_clear_error_string(context);
 103         free(msg);
 104         return;
 105     }
 106     msg->code = code;
 107
 108     if (flags & HX509_ERROR_APPEND) {
 109         msg->next = context->error;
 110         context->error = msg;
 111     } else  {
 112         free_error_string(context->error);
 113         context->error = msg;
 114     }
 115 }
 116
 117 /**
 118  * See hx509_set_error_stringv().
 119  *
 120  * @param context A hx509 context.
 121  * @param flags
 122  * - HX509_ERROR_APPEND appends the error string to the old messages
 123      (code is updated).
 124  * @param code error code related to error message
 125  * @param fmt error message format
 126  * @param ... arguments to error message format
 127  *
 128  * @ingroup hx509_error
 129  */
 130
 131 void
 132 hx509_set_error_string(hx509_context context, int flags, int code,
 133                        const char *fmt, ...)
 134 {
 135     va_list ap;
 136
 137     va_start(ap, fmt);
 138     hx509_set_error_stringv(context, flags, code, fmt, ap);
 139     va_end(ap);
 140 }
 141
 142 /**
 143  * Get an error string from context associated with error_code.
 144  *
 145  * @param context A hx509 context.
 146  * @param error_code Get error message for this error code.
 147  *
 148  * @return error string, free with hx509_free_error_string().
 149  *
 150  * @ingroup hx509_error
 151  */
 152
 153 char *
 154 hx509_get_error_string(hx509_context context, int error_code)
 155 {
 156     struct rk_strpool *p = NULL;
 157     hx509_error msg = context->error;
 158
 159     if (msg == NULL || msg->code != error_code) {
 160         const char *cstr;
 161         char *str;
 162
 163         cstr = com_right(context->et_list, error_code);
 164         if (cstr)
 165             return strdup(cstr);
 166         cstr = strerror(error_code);
 167         if (cstr)
 168             return strdup(cstr);
 169         if (asprintf(&str, "<unknown error: %d>", error_code) == -1)
 170             return NULL;
 171         return str;
 172     }
 173
 174     for (msg = context->error; msg; msg = msg->next)
 175         p = rk_strpoolprintf(p, "%s%s", msg->msg,
 176                              msg->next != NULL ? "; " : "");
 177
 178     return rk_strpoolcollect(p);
 179 }
 180
 181 /**
 182  * Free error string returned by hx509_get_error_string().
 183  *
 184  * @param str error string to free.
 185  *
 186  * @ingroup hx509_error
 187  */
 188
 189 void
 190 hx509_free_error_string(char *str)
 191 {
 192     free(str);
 193 }
 194
 195 /**
 196  * Print error message and fatally exit from error code
 197  *
 198  * @param context A hx509 context.
 199  * @param exit_code exit() code from process.
 200  * @param error_code Error code for the reason to exit.
 201  * @param fmt format string with the exit message.
 202  * @param ... argument to format string.
 203  *
 204  * @ingroup hx509_error
 205  */
 206
 207 void
 208 hx509_err(hx509_context context, int exit_code,
 209           int error_code, const char *fmt, ...)
 210 {
 211     va_list ap;
 212     const char *msg;
 213     char *str;
 214
 215     va_start(ap, fmt);
 216     vasprintf(&str, fmt, ap);
 217     va_end(ap);
 218     msg = hx509_get_error_string(context, error_code);
 219     if (msg == NULL)
 220         msg = "no error";
 221
 222     errx(exit_code, "%s: %s", str, msg);
 223 }