kcm/cursor.c

   1 /*
   2  * Copyright (c) 2005, PADL Software Pty Ltd.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of PADL Software nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include "kcm_locl.h"
  34
  35 RCSID("$Id$");
  36
  37 krb5_error_code
  38 kcm_cursor_new(krb5_context context,
  39                pid_t pid,
  40                kcm_ccache ccache,
  41                uint32_t *cursor)
  42 {
  43     kcm_cursor **p;
  44     krb5_error_code ret;
  45
  46     *cursor = 0;
  47
  48     KCM_ASSERT_VALID(ccache);
  49
  50     HEIMDAL_MUTEX_lock(&ccache->mutex);
  51     for (p = &ccache->cursors; *p != NULL; p = &(*p)->next)
  52         ;
  53
  54     *p = (kcm_cursor *)malloc(sizeof(kcm_cursor));
  55     if (*p == NULL) {
  56         ret = KRB5_CC_NOMEM;
  57         goto out;
  58     }
  59
  60     (*p)->pid = pid;
  61     (*p)->key = ++ccache->n_cursor;
  62     (*p)->credp = ccache->creds;
  63     (*p)->next = NULL;
  64
  65     *cursor = (*p)->key;
  66
  67     ret = 0;
  68
  69 out:
  70     HEIMDAL_MUTEX_unlock(&ccache->mutex);
  71
  72     return ret;
  73 }
  74
  75 krb5_error_code
  76 kcm_cursor_find(krb5_context context,
  77                 pid_t pid,
  78                 kcm_ccache ccache,
  79                 uint32_t key,
  80                 kcm_cursor **cursor)
  81 {
  82     kcm_cursor *p;
  83     krb5_error_code ret;
  84
  85     KCM_ASSERT_VALID(ccache);
  86
  87     if (key == 0)
  88         return KRB5_CC_NOTFOUND;
  89
  90     ret = KRB5_CC_END;
  91
  92     HEIMDAL_MUTEX_lock(&ccache->mutex);
  93
  94     for (p = ccache->cursors; p != NULL; p = p->next) {
  95         if (p->key == key) {
  96             if (p->pid != pid)
  97                 ret = KRB5_FCC_PERM;
  98             else
  99                 ret = 0;
 100             break;
 101         }
 102     }
 103
 104     if (ret == 0)
 105         *cursor = p;
 106
 107     HEIMDAL_MUTEX_unlock(&ccache->mutex);
 108
 109     return ret;
 110 }
 111
 112 krb5_error_code
 113 kcm_cursor_delete(krb5_context context,
 114                   pid_t pid,
 115                   kcm_ccache ccache,
 116                   uint32_t key)
 117 {
 118     kcm_cursor **p;
 119     krb5_error_code ret;
 120
 121     KCM_ASSERT_VALID(ccache);
 122
 123     if (key == 0)
 124         return KRB5_CC_NOTFOUND;
 125
 126     ret = KRB5_CC_END;
 127
 128     HEIMDAL_MUTEX_lock(&ccache->mutex);
 129
 130     for (p = &ccache->cursors; *p != NULL; p = &(*p)->next) {
 131         if ((*p)->key == key) {
 132             if ((*p)->pid != pid)
 133                 ret = KRB5_FCC_PERM;
 134             else
 135                 ret = 0;
 136             break;
 137         }
 138     }
 139
 140     if (ret == 0) {
 141         kcm_cursor *x = *p;
 142
 143         *p = x->next;
 144         free(x);
 145     }
 146
 147     HEIMDAL_MUTEX_unlock(&ccache->mutex);
 148
 149     return ret;
 150 }
 151