lib/krb5/store_fd.c

   1 /*
   2  * Copyright (c) 1997 - 2004 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 #include "store-int.h"
  36
  37 RCSID("$Id$");
  38
  39 typedef struct fd_storage {
  40     int fd;
  41 } fd_storage;
  42
  43 #define FD(S) (((fd_storage*)(S)->data)->fd)
  44
  45 static ssize_t
  46 fd_fetch(krb5_storage * sp, void *data, size_t size)
  47 {
  48     return net_read(FD(sp), data, size);
  49 }
  50
  51 static ssize_t
  52 fd_store(krb5_storage * sp, const void *data, size_t size)
  53 {
  54     return net_write(FD(sp), data, size);
  55 }
  56
  57 static off_t
  58 fd_seek(krb5_storage * sp, off_t offset, int whence)
  59 {
  60     return lseek(FD(sp), offset, whence);
  61 }
  62
  63 static void
  64 fd_free(krb5_storage * sp)
  65 {
  66     close(FD(sp));
  67 }
  68
  69 krb5_storage * KRB5_LIB_FUNCTION
  70 krb5_storage_from_fd(int fd)
  71 {
  72     krb5_storage *sp;
  73
  74     fd = dup(fd);
  75     if (fd < 0)
  76         return NULL;
  77
  78     sp = malloc(sizeof(krb5_storage));
  79     if (sp == NULL) {
  80         close(fd);
  81         return NULL;
  82     }
  83
  84     sp->data = malloc(sizeof(fd_storage));
  85     if (sp->data == NULL) {
  86         close(fd);
  87         free(sp);
  88         return NULL;
  89     }
  90     sp->flags = 0;
  91     sp->eof_code = HEIM_ERR_EOF;
  92     FD(sp) = fd;
  93     sp->fetch = fd_fetch;
  94     sp->store = fd_store;
  95     sp->seek = fd_seek;
  96     sp->free = fd_free;
  97     return sp;
  98 }