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
37typedef struct fd_storage {
38    int fd;
39} fd_storage;
40
41#define FD(S) (((fd_storage*)(S)->data)->fd)
42
43static ssize_t
44fd_fetch(krb5_storage * sp, void *data, size_t size)
45{
46    return net_read(FD(sp), data, size);
47}
48
49static ssize_t
50fd_store(krb5_storage * sp, const void *data, size_t size)
51{
52    return net_write(FD(sp), data, size);
53}
54
55static off_t
56fd_seek(krb5_storage * sp, off_t offset, int whence)
57{
58    return lseek(FD(sp), offset, whence);
59}
60
61static int
62fd_trunc(krb5_storage * sp, off_t offset)
63{
64    if (ftruncate(FD(sp), offset) == -1)
65	return errno;
66    return 0;
67}
68
69static void
70fd_free(krb5_storage * sp)
71{
72    close(FD(sp));
73}
74
75/**
76 *
77 *
78 * @return A krb5_storage on success, or NULL on out of memory error.
79 *
80 * @ingroup krb5_storage
81 *
82 * @sa krb5_storage_emem()
83 * @sa krb5_storage_from_mem()
84 * @sa krb5_storage_from_readonly_mem()
85 * @sa krb5_storage_from_data()
86 */
87
88KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
89krb5_storage_from_fd(krb5_socket_t fd_in)
90{
91    krb5_storage *sp;
92    int fd;
93
94#ifdef SOCKET_IS_NOT_AN_FD
95#ifdef _MSC_VER
96    if (_get_osfhandle(fd_in) != -1) {
97	fd = dup(fd_in);
98    } else {
99	fd = _open_osfhandle(fd_in, 0);
100    }
101#else
102#error Dont know how to deal with fd that may or may not be a socket.
103#endif
104#else  /* SOCKET_IS_NOT_AN_FD */
105    fd = dup(fd_in);
106#endif
107
108    if (fd < 0)
109	return NULL;
110
111    sp = malloc(sizeof(krb5_storage));
112    if (sp == NULL) {
113	close(fd);
114	return NULL;
115    }
116
117    sp->data = malloc(sizeof(fd_storage));
118    if (sp->data == NULL) {
119	close(fd);
120	free(sp);
121	return NULL;
122    }
123    sp->flags = 0;
124    sp->eof_code = HEIM_ERR_EOF;
125    FD(sp) = fd;
126    sp->fetch = fd_fetch;
127    sp->store = fd_store;
128    sp->seek = fd_seek;
129    sp->trunc = fd_trunc;
130    sp->free = fd_free;
131    sp->max_alloc = UINT_MAX/8;
132    return sp;
133}
134