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 struct hx509_error_data {
  38     hx509_error next;
  39     int code;
  40     char *msg;
  41 };
  42
  43 static void
  44 free_error_string(hx509_error msg)
  45 {
  46     while(msg) {
  47         hx509_error m2 = msg->next;
  48         free(msg->msg);
  49         free(msg);
  50         msg = m2;
  51     }
  52 }
  53
  54 void
  55 hx509_clear_error_string(hx509_context context)
  56 {
  57     free_error_string(context->error);
  58     context->error = NULL;
  59 }
  60
  61 void
  62 hx509_set_error_stringv(hx509_context context, int flags, int code,
  63                         const char *fmt, va_list ap)
  64 {
  65     hx509_error msg;
  66
  67     msg = calloc(1, sizeof(*msg));
  68     if (msg == NULL) {
  69         hx509_clear_error_string(context);
  70         return;
  71     }
  72
  73     if (vasprintf(&msg->msg, fmt, ap) == -1) {
  74         hx509_clear_error_string(context);
  75         free(msg);
  76         return;
  77     }
  78     msg->code = code;
  79
  80     if (flags & HX509_ERROR_APPEND) {
  81         msg->next = context->error;
  82         context->error = msg;
  83     } else  {
  84         free_error_string(context->error);
  85         context->error = msg;
  86     }
  87 }
  88
  89 void
  90 hx509_set_error_string(hx509_context context, int flags, int code,
  91                        const char *fmt, ...)
  92 {
  93     va_list ap;
  94
  95     va_start(ap, fmt);
  96     hx509_set_error_stringv(context, flags, code, fmt, ap);
  97     va_end(ap);
  98 }
  99
 100 char *
 101 hx509_get_error_string(hx509_context context, int error_code)
 102 {
 103     struct rk_strpool *p = NULL;
 104     hx509_error msg = context->error;
 105
 106     if (msg == NULL || msg->code != error_code) {
 107         const char *cstr;
 108         char *str;
 109
 110         cstr = com_right(context->et_list, error_code);
 111         if (cstr)
 112             return strdup(cstr);
 113         cstr = strerror(error_code);
 114         if (cstr)
 115             return strdup(cstr);
 116         if (asprintf(&str, "<unknown error: %d>", error_code) == -1)
 117             return NULL;
 118         return str;
 119     }
 120
 121     for (msg = context->error; msg; msg = msg->next)
 122         p = rk_strpoolprintf(p, "%s%s", msg->msg,
 123                              msg->next != NULL ? "; " : "");
 124
 125     return rk_strpoolcollect(p);
 126 }
 127
 128 void
 129 hx509_err(hx509_context context, int exit_code,
 130           int error_code, const char *fmt, ...)
 131 {
 132     va_list ap;
 133     const char *msg;
 134     char *str;
 135
 136     va_start(ap, fmt);
 137     vasprintf(&str, fmt, ap);
 138     va_end(ap);
 139     msg = hx509_get_error_string(context, error_code);
 140     if (msg == NULL)
 141         msg = "no error";
 142
 143     errx(exit_code, "%s: %s", str, msg);
 144 }