Line data Source code
1 : /*
2 : * Copyright (c) 1997 - 2000, 2002 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 mem_storage{
38 : unsigned char *base;
39 : size_t size;
40 : unsigned char *ptr;
41 : }mem_storage;
42 :
43 : static ssize_t
44 7580026 : mem_fetch(krb5_storage *sp, void *data, size_t size)
45 : {
46 7580026 : mem_storage *s = (mem_storage*)sp->data;
47 7580026 : if(size > (size_t)(s->base + s->size - s->ptr))
48 23086 : size = s->base + s->size - s->ptr;
49 7580026 : memmove(data, s->ptr, size);
50 7580026 : sp->seek(sp, size, SEEK_CUR);
51 7580026 : return size;
52 : }
53 :
54 : static ssize_t
55 4439 : mem_store(krb5_storage *sp, const void *data, size_t size)
56 : {
57 4439 : mem_storage *s = (mem_storage*)sp->data;
58 4439 : if(size > (size_t)(s->base + s->size - s->ptr))
59 0 : size = s->base + s->size - s->ptr;
60 4439 : memmove(s->ptr, data, size);
61 4439 : sp->seek(sp, size, SEEK_CUR);
62 4439 : return size;
63 : }
64 :
65 : static ssize_t
66 0 : mem_no_store(krb5_storage *sp, const void *data, size_t size)
67 : {
68 0 : return -1;
69 : }
70 :
71 : static off_t
72 17864534 : mem_seek(krb5_storage *sp, off_t offset, int whence)
73 : {
74 17864534 : mem_storage *s = (mem_storage*)sp->data;
75 17864534 : switch(whence){
76 9346735 : case SEEK_SET:
77 9346735 : if((size_t)offset > s->size)
78 0 : offset = s->size;
79 9346735 : if(offset < 0)
80 0 : offset = 0;
81 9346735 : s->ptr = s->base + offset;
82 9346735 : break;
83 8103331 : case SEEK_CUR:
84 8103331 : return sp->seek(sp, s->ptr - s->base + offset, SEEK_SET);
85 414468 : case SEEK_END:
86 414468 : return sp->seek(sp, s->size + offset, SEEK_SET);
87 0 : default:
88 0 : errno = EINVAL;
89 0 : return -1;
90 : }
91 9346735 : return s->ptr - s->base;
92 : }
93 :
94 : static int
95 0 : mem_trunc(krb5_storage *sp, off_t offset)
96 : {
97 0 : mem_storage *s = (mem_storage*)sp->data;
98 0 : if((size_t)offset > s->size)
99 0 : return ERANGE;
100 0 : s->size = offset;
101 0 : if ((s->ptr - s->base) > offset)
102 0 : s->ptr = s->base + offset;
103 0 : return 0;
104 : }
105 :
106 : static int
107 0 : mem_no_trunc(krb5_storage *sp, off_t offset)
108 : {
109 0 : return EINVAL;
110 : }
111 :
112 : /**
113 : * Create a fixed size memory storage block
114 : *
115 : * @return A krb5_storage on success, or NULL on out of memory error.
116 : *
117 : * @ingroup krb5_storage
118 : *
119 : * @sa krb5_storage_mem()
120 : * @sa krb5_storage_from_readonly_mem()
121 : * @sa krb5_storage_from_data()
122 : * @sa krb5_storage_from_fd()
123 : * @sa krb5_storage_from_socket()
124 : */
125 :
126 : KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
127 294173 : krb5_storage_from_mem(void *buf, size_t len)
128 : {
129 294173 : krb5_storage *sp = malloc(sizeof(krb5_storage));
130 6913 : mem_storage *s;
131 294173 : if(sp == NULL)
132 0 : return NULL;
133 294173 : s = malloc(sizeof(*s));
134 294173 : if(s == NULL) {
135 0 : free(sp);
136 0 : return NULL;
137 : }
138 294173 : sp->data = s;
139 294173 : sp->flags = 0;
140 294173 : sp->eof_code = HEIM_ERR_EOF;
141 294173 : s->base = buf;
142 294173 : s->size = len;
143 294173 : s->ptr = buf;
144 294173 : sp->fetch = mem_fetch;
145 294173 : sp->store = mem_store;
146 294173 : sp->seek = mem_seek;
147 294173 : sp->trunc = mem_trunc;
148 294173 : sp->fsync = NULL;
149 294173 : sp->free = NULL;
150 294173 : sp->max_alloc = UINT32_MAX/64;
151 294173 : return sp;
152 : }
153 :
154 : /**
155 : * Create a fixed size memory storage block
156 : *
157 : * @return A krb5_storage on success, or NULL on out of memory error.
158 : *
159 : * @ingroup krb5_storage
160 : *
161 : * @sa krb5_storage_mem()
162 : * @sa krb5_storage_from_mem()
163 : * @sa krb5_storage_from_readonly_mem()
164 : * @sa krb5_storage_from_fd()
165 : */
166 :
167 : KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
168 0 : krb5_storage_from_data(krb5_data *data)
169 : {
170 0 : return krb5_storage_from_mem(data->data, data->length);
171 : }
172 :
173 : /**
174 : * Create a fixed size memory storage block that is read only
175 : *
176 : * @return A krb5_storage on success, or NULL on out of memory error.
177 : *
178 : * @ingroup krb5_storage
179 : *
180 : * @sa krb5_storage_mem()
181 : * @sa krb5_storage_from_mem()
182 : * @sa krb5_storage_from_data()
183 : * @sa krb5_storage_from_fd()
184 : */
185 :
186 : KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
187 436979 : krb5_storage_from_readonly_mem(const void *buf, size_t len)
188 : {
189 436979 : krb5_storage *sp = malloc(sizeof(krb5_storage));
190 10242 : mem_storage *s;
191 436979 : if(sp == NULL)
192 0 : return NULL;
193 436979 : s = malloc(sizeof(*s));
194 436979 : if(s == NULL) {
195 0 : free(sp);
196 0 : return NULL;
197 : }
198 436979 : sp->data = s;
199 436979 : sp->flags = 0;
200 436979 : sp->eof_code = HEIM_ERR_EOF;
201 436979 : s->base = rk_UNCONST(buf);
202 436979 : s->size = len;
203 436979 : s->ptr = rk_UNCONST(buf);
204 436979 : sp->fetch = mem_fetch;
205 436979 : sp->store = mem_no_store;
206 436979 : sp->seek = mem_seek;
207 436979 : sp->trunc = mem_no_trunc;
208 436979 : sp->fsync = NULL;
209 436979 : sp->free = NULL;
210 436979 : sp->max_alloc = UINT32_MAX/64;
211 436979 : return sp;
212 : }
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