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 typedef struct fd_storage {
38 int fd;
39 } fd_storage;
40
41 #define FD(S) (((fd_storage*)(S)->data)->fd)
42
43 static ssize_t
fd_fetch(krb5_storage * sp,void * data,size_t size)44 fd_fetch(krb5_storage * sp, void *data, size_t size)
45 {
46 return net_read(FD(sp), data, size);
47 }
48
49 static ssize_t
fd_store(krb5_storage * sp,const void * data,size_t size)50 fd_store(krb5_storage * sp, const void *data, size_t size)
51 {
52 return net_write(FD(sp), data, size);
53 }
54
55 static off_t
fd_seek(krb5_storage * sp,off_t offset,int whence)56 fd_seek(krb5_storage * sp, off_t offset, int whence)
57 {
58 return lseek(FD(sp), offset, whence);
59 }
60
61 static int
fd_trunc(krb5_storage * sp,off_t offset)62 fd_trunc(krb5_storage * sp, off_t offset)
63 {
64 if (ftruncate(FD(sp), offset) == -1)
65 return errno;
66 return 0;
67 }
68
69 static void
fd_free(krb5_storage * sp)70 fd_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
88 KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
krb5_storage_from_fd(krb5_socket_t fd_in)89 krb5_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