crypto/external/bsd/heimdal/dist/lib/krb5/store_fd.c

   1 /*      $NetBSD: store_fd.c,v 1.1.1.2 2014/04/24 12:45:51 pettai Exp $  */
   2
   3 /*
   4  * Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "krb5_locl.h"
  37 #include "store-int.h"
  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 int
  64 fd_trunc(krb5_storage * sp, off_t offset)
  65 {
  66     if (ftruncate(FD(sp), offset) == -1)
  67         return errno;
  68     return 0;
  69 }
  70
  71 static void
  72 fd_free(krb5_storage * sp)
  73 {
  74     close(FD(sp));
  75 }
  76
  77 /**
  78  *
  79  *
  80  * @return A krb5_storage on success, or NULL on out of memory error.
  81  *
  82  * @ingroup krb5_storage
  83  *
  84  * @sa krb5_storage_emem()
  85  * @sa krb5_storage_from_mem()
  86  * @sa krb5_storage_from_readonly_mem()
  87  * @sa krb5_storage_from_data()
  88  */
  89
  90 KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
  91 krb5_storage_from_fd(krb5_socket_t fd_in)
  92 {
  93     krb5_storage *sp;
  94     int fd;
  95
  96 #ifdef SOCKET_IS_NOT_AN_FD
  97 #ifdef _MSC_VER
  98     if (_get_osfhandle(fd_in) != -1) {
  99         fd = dup(fd_in);
 100     } else {
 101         fd = _open_osfhandle(fd_in, 0);
 102     }
 103 #else
 104 #error Dont know how to deal with fd that may or may not be a socket.
 105 #endif
 106 #else  /* SOCKET_IS_NOT_AN_FD */
 107     fd = dup(fd_in);
 108 #endif
 109
 110     if (fd < 0)
 111         return NULL;
 112
 113     sp = malloc(sizeof(krb5_storage));
 114     if (sp == NULL) {
 115         close(fd);
 116         return NULL;
 117     }
 118
 119     sp->data = malloc(sizeof(fd_storage));
 120     if (sp->data == NULL) {
 121         close(fd);
 122         free(sp);
 123         return NULL;
 124     }
 125     sp->flags = 0;
 126     sp->eof_code = HEIM_ERR_EOF;
 127     FD(sp) = fd;
 128     sp->fetch = fd_fetch;
 129     sp->store = fd_store;
 130     sp->seek = fd_seek;
 131     sp->trunc = fd_trunc;
 132     sp->free = fd_free;
 133     sp->max_alloc = UINT_MAX/8;
 134     return sp;
 135 }