2 * Copyright (c) 2017 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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.
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.
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
34 #include "krb5_locl.h"
35 #include "store-int.h"
42 typedef struct stdio_storage {
47 #define F(S) (((stdio_storage*)(S)->data)->f)
48 #define POS(S) (((stdio_storage*)(S)->data)->pos)
51 stdio_fetch(krb5_storage * sp, void *data, size_t size)
53 char *cbuf = (char *)data;
57 /* similar pattern to net_read() to support pipes */
59 count = fread(cbuf, 1, rem, F(sp));
66 } else if (count == 0) {
68 POS(sp) += size - rem;
80 stdio_store(krb5_storage * sp, const void *data, size_t size)
82 const char *cbuf = (const char *)data;
86 /* similar pattern to net_write() to support pipes */
88 count = fwrite(cbuf, 1, rem, F(sp));
93 * What does it mean to have a short write when using stdio?
95 * It can't mean much. After all stdio is buffering, so
96 * earlier writes that appeared complete may have failed,
97 * and so we don't know how much we really failed to write.
115 stdio_seek(krb5_storage * sp, off_t offset, int whence)
117 int save_errno = errno;
119 if (whence == SEEK_SET && POS(sp) == offset)
122 if (whence == SEEK_CUR && POS(sp) >= 0 && offset == 0)
125 if (fseeko(F(sp), offset, whence) != 0)
128 return POS(sp) = ftello(F(sp));
132 stdio_trunc(krb5_storage * sp, off_t offset)
135 int save_errno = errno;
137 if (fflush(F(sp)) == EOF)
139 tmpoff = ftello(F(sp));
142 if (ftruncate(fileno(F(sp)), offset) == -1)
144 if (fseeko(F(sp), 0, SEEK_END) == -1)
146 if (fseeko(F(sp), tmpoff, SEEK_SET) == -1)
154 stdio_sync(krb5_storage * sp)
156 if (fflush(F(sp)) == EOF)
158 if (fsync(fileno(F(sp))) == -1)
164 stdio_free(krb5_storage * sp)
166 int save_errno = errno;
168 if (F(sp) != NULL && fclose(F(sp)) == 0)
174 * Open a krb5_storage using stdio for buffering.
176 * @return A krb5_storage on success, or NULL on out of memory error.
178 * @ingroup krb5_storage
180 * @sa krb5_storage_emem()
181 * @sa krb5_storage_from_fd()
182 * @sa krb5_storage_from_mem()
183 * @sa krb5_storage_from_readonly_mem()
184 * @sa krb5_storage_from_data()
185 * @sa krb5_storage_from_socket()
188 KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
189 krb5_storage_stdio_from_fd(int fd_in, const char *mode)
194 int saved_errno = errno;
197 off = lseek(fd_in, 0, SEEK_CUR);
203 * This function used to try to pass the input to
204 * _get_osfhandle() to test if the value is a HANDLE
205 * but this doesn't work because doing so throws an
206 * exception that will result in Watson being triggered
207 * to file a Windows Error Report.
217 f = fdopen(fd, mode);
225 if (fseeko(f, off, SEEK_SET) == -1) {
233 sp = malloc(sizeof(krb5_storage));
242 sp->data = malloc(sizeof(stdio_storage));
243 if (sp->data == NULL) {
251 sp->eof_code = HEIM_ERR_EOF;
254 sp->fetch = stdio_fetch;
255 sp->store = stdio_store;
256 sp->seek = stdio_seek;
257 sp->trunc = stdio_trunc;
258 sp->fsync = stdio_sync;
259 sp->free = stdio_free;
260 sp->max_alloc = UINT_MAX/8;