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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/kerrs.c - Error message functions */
/*
* Copyright 2006 Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "k5-int.h"
#include "int-proto.h"
#ifdef DEBUG
static int error_message_debug = 0;
#ifndef ERROR_MESSAGE_DEBUG
#define ERROR_MESSAGE_DEBUG() (error_message_debug != 0)
#endif
#endif
void KRB5_CALLCONV_C
krb5_set_error_message(krb5_context ctx, krb5_error_code code,
const char *fmt, ...)
{
va_list args;
if (ctx == NULL)
return;
va_start(args, fmt);
#ifdef DEBUG
if (ERROR_MESSAGE_DEBUG()) {
fprintf(stderr,
"krb5_set_error_message(ctx=%p/err=%p, code=%ld, ...)\n",
ctx, &ctx->err, (long)code);
}
#endif
k5_vset_error(&ctx->err, code, fmt, args);
#ifdef DEBUG
if (ERROR_MESSAGE_DEBUG())
fprintf(stderr, "->%s\n", ctx->err.msg);
#endif
va_end(args);
}
void KRB5_CALLCONV
krb5_vset_error_message(krb5_context ctx, krb5_error_code code,
const char *fmt, va_list args)
{
#ifdef DEBUG
if (ERROR_MESSAGE_DEBUG()) {
fprintf(stderr, "krb5_vset_error_message(ctx=%p, code=%ld, ...)\n",
ctx, (long)code);
}
#endif
if (ctx == NULL)
return;
k5_vset_error(&ctx->err, code, fmt, args);
#ifdef DEBUG
if (ERROR_MESSAGE_DEBUG())
fprintf(stderr, "->%s\n", ctx->err.msg);
#endif
}
void KRB5_CALLCONV
krb5_prepend_error_message(krb5_context ctx, krb5_error_code code,
const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
krb5_vwrap_error_message(ctx, code, code, fmt, ap);
va_end(ap);
}
void KRB5_CALLCONV
krb5_vprepend_error_message(krb5_context ctx, krb5_error_code code,
const char *fmt, va_list ap)
{
krb5_wrap_error_message(ctx, code, code, fmt, ap);
}
void KRB5_CALLCONV
krb5_wrap_error_message(krb5_context ctx, krb5_error_code old_code,
krb5_error_code code, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
krb5_vwrap_error_message(ctx, old_code, code, fmt, ap);
va_end(ap);
}
void KRB5_CALLCONV
krb5_vwrap_error_message(krb5_context ctx, krb5_error_code old_code,
krb5_error_code code, const char *fmt, va_list ap)
{
const char *prev_msg;
char *prepend;
if (ctx == NULL || vasprintf(&prepend, fmt, ap) < 0)
return;
prev_msg = k5_get_error(&ctx->err, old_code);
k5_set_error(&ctx->err, code, "%s: %s", prepend, prev_msg);
k5_free_error(&ctx->err, prev_msg);
free(prepend);
}
/* Set the error message state of dest_ctx to that of src_ctx. */
void KRB5_CALLCONV
krb5_copy_error_message(krb5_context dest_ctx, krb5_context src_ctx)
{
if (dest_ctx == src_ctx)
return;
if (src_ctx->err.msg != NULL) {
k5_set_error(&dest_ctx->err, src_ctx->err.code, "%s",
src_ctx->err.msg);
} else {
k5_clear_error(&dest_ctx->err);
}
}
/* Re-format msg using the format string err_fmt. Return an allocated result,
* or NULL if err_fmt is NULL or on allocation failure. */
static char *
err_fmt_fmt(const char *err_fmt, long code, const char *msg)
{
struct k5buf buf;
const char *p, *s;
if (err_fmt == NULL)
return NULL;
k5_buf_init_dynamic(&buf);
s = err_fmt;
while ((p = strchr(s, '%')) != NULL) {
k5_buf_add_len(&buf, s, p - s);
s = p;
if (p[1] == '\0')
break;
else if (p[1] == 'M')
k5_buf_add(&buf, msg);
else if (p[1] == 'C')
k5_buf_add_fmt(&buf, "%ld", code);
else if (p[1] == '%')
k5_buf_add(&buf, "%");
else
k5_buf_add_fmt(&buf, "%%%c", p[1]);
s += 2;
}
k5_buf_add(&buf, s); /* Remainder after last token */
return k5_buf_cstring(&buf);
}
const char * KRB5_CALLCONV
krb5_get_error_message(krb5_context ctx, krb5_error_code code)
{
const char *std, *custom;
#ifdef DEBUG
if (ERROR_MESSAGE_DEBUG())
fprintf(stderr, "krb5_get_error_message(%p, %ld)\n", ctx, (long)code);
#endif
if (ctx == NULL)
return error_message(code);
std = k5_get_error(&ctx->err, code);
custom = err_fmt_fmt(ctx->err_fmt, code, std);
if (custom != NULL) {
free((char *)std);
return custom;
}
return std;
}
void KRB5_CALLCONV
krb5_free_error_message(krb5_context ctx, const char *msg)
{
#ifdef DEBUG
if (ERROR_MESSAGE_DEBUG())
fprintf(stderr, "krb5_free_error_message(%p, %p)\n", ctx, msg);
#endif
if (ctx == NULL)
return;
k5_free_error(&ctx->err, msg);
}
void KRB5_CALLCONV
krb5_clear_error_message(krb5_context ctx)
{
#ifdef DEBUG
if (ERROR_MESSAGE_DEBUG())
fprintf(stderr, "krb5_clear_error_message(%p)\n", ctx);
#endif
if (ctx == NULL)
return;
k5_clear_error(&ctx->err);
}
void
k5_save_ctx_error(krb5_context ctx, krb5_error_code code, struct errinfo *out)
{
out->code = code;
out->msg = NULL;
if (ctx != NULL && ctx->err.code == code) {
out->msg = ctx->err.msg;
ctx->err.code = 0;
ctx->err.msg = NULL;
}
}
krb5_error_code
k5_restore_ctx_error(krb5_context ctx, struct errinfo *in)
{
krb5_error_code code = in->code;
if (ctx != NULL) {
k5_clear_error(&ctx->err);
ctx->err.code = in->code;
ctx->err.msg = in->msg;
in->msg = NULL;
} else {
k5_clear_error(in);
}
return code;
}
/* If ctx contains an extended error message for oldcode, change it to be an
* extended error message for newcode. */
void
k5_change_error_message_code(krb5_context ctx, krb5_error_code oldcode,
krb5_error_code newcode)
{
if (ctx != NULL && ctx->err.msg != NULL && ctx->err.code == oldcode)
ctx->err.code = newcode;
}
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