1 /* crypto/bio/bss_fd.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include <errno.h>
61 #define USE_SOCKETS
62 #include "cryptlib.h"
63
64 #if defined(OPENSSL_NO_POSIX_IO)
65 /*
66 * One can argue that one should implement dummy placeholder for
67 * BIO_s_fd here...
68 */
69 #else
70 /*
71 * As for unconditional usage of "UPLINK" interface in this module.
72 * Trouble is that unlike Unix file descriptors [which are indexes
73 * in kernel-side per-process table], corresponding descriptors on
74 * platforms which require "UPLINK" interface seem to be indexes
75 * in a user-land, non-global table. Well, in fact they are indexes
76 * in stdio _iob[], and recall that _iob[] was the very reason why
77 * "UPLINK" interface was introduced in first place. But one way on
78 * another. Neither libcrypto or libssl use this BIO meaning that
79 * file descriptors can only be provided by application. Therefore
80 * "UPLINK" calls are due...
81 */
82 # include "bio_lcl.h"
83
84 static int fd_write(BIO *h, const char *buf, int num);
85 static int fd_read(BIO *h, char *buf, int size);
86 static int fd_puts(BIO *h, const char *str);
87 static int fd_gets(BIO *h, char *buf, int size);
88 static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2);
89 static int fd_new(BIO *h);
90 static int fd_free(BIO *data);
91 int BIO_fd_should_retry(int s);
92
93 static BIO_METHOD methods_fdp = {
94 BIO_TYPE_FD, "file descriptor",
95 fd_write,
96 fd_read,
97 fd_puts,
98 fd_gets,
99 fd_ctrl,
100 fd_new,
101 fd_free,
102 NULL,
103 };
104
BIO_s_fd(void)105 BIO_METHOD *BIO_s_fd(void)
106 {
107 return (&methods_fdp);
108 }
109
BIO_new_fd(int fd,int close_flag)110 BIO *BIO_new_fd(int fd, int close_flag)
111 {
112 BIO *ret;
113 ret = BIO_new(BIO_s_fd());
114 if (ret == NULL)
115 return (NULL);
116 BIO_set_fd(ret, fd, close_flag);
117 return (ret);
118 }
119
fd_new(BIO * bi)120 static int fd_new(BIO *bi)
121 {
122 bi->init = 0;
123 bi->num = -1;
124 bi->ptr = NULL;
125 bi->flags = BIO_FLAGS_UPLINK; /* essentially redundant */
126 return (1);
127 }
128
fd_free(BIO * a)129 static int fd_free(BIO *a)
130 {
131 if (a == NULL)
132 return (0);
133 if (a->shutdown) {
134 if (a->init) {
135 UP_close(a->num);
136 }
137 a->init = 0;
138 a->flags = BIO_FLAGS_UPLINK;
139 }
140 return (1);
141 }
142
fd_read(BIO * b,char * out,int outl)143 static int fd_read(BIO *b, char *out, int outl)
144 {
145 int ret = 0;
146
147 if (out != NULL) {
148 clear_sys_error();
149 ret = UP_read(b->num, out, outl);
150 BIO_clear_retry_flags(b);
151 if (ret <= 0) {
152 if (BIO_fd_should_retry(ret))
153 BIO_set_retry_read(b);
154 }
155 }
156 return (ret);
157 }
158
fd_write(BIO * b,const char * in,int inl)159 static int fd_write(BIO *b, const char *in, int inl)
160 {
161 int ret;
162 clear_sys_error();
163 ret = UP_write(b->num, in, inl);
164 BIO_clear_retry_flags(b);
165 if (ret <= 0) {
166 if (BIO_fd_should_retry(ret))
167 BIO_set_retry_write(b);
168 }
169 return (ret);
170 }
171
fd_ctrl(BIO * b,int cmd,long num,void * ptr)172 static long fd_ctrl(BIO *b, int cmd, long num, void *ptr)
173 {
174 long ret = 1;
175 int *ip;
176
177 switch (cmd) {
178 case BIO_CTRL_RESET:
179 num = 0;
180 case BIO_C_FILE_SEEK:
181 ret = (long)UP_lseek(b->num, num, 0);
182 break;
183 case BIO_C_FILE_TELL:
184 case BIO_CTRL_INFO:
185 ret = (long)UP_lseek(b->num, 0, 1);
186 break;
187 case BIO_C_SET_FD:
188 fd_free(b);
189 b->num = *((int *)ptr);
190 b->shutdown = (int)num;
191 b->init = 1;
192 break;
193 case BIO_C_GET_FD:
194 if (b->init) {
195 ip = (int *)ptr;
196 if (ip != NULL)
197 *ip = b->num;
198 ret = b->num;
199 } else
200 ret = -1;
201 break;
202 case BIO_CTRL_GET_CLOSE:
203 ret = b->shutdown;
204 break;
205 case BIO_CTRL_SET_CLOSE:
206 b->shutdown = (int)num;
207 break;
208 case BIO_CTRL_PENDING:
209 case BIO_CTRL_WPENDING:
210 ret = 0;
211 break;
212 case BIO_CTRL_DUP:
213 case BIO_CTRL_FLUSH:
214 ret = 1;
215 break;
216 default:
217 ret = 0;
218 break;
219 }
220 return (ret);
221 }
222
fd_puts(BIO * bp,const char * str)223 static int fd_puts(BIO *bp, const char *str)
224 {
225 int n, ret;
226
227 n = strlen(str);
228 ret = fd_write(bp, str, n);
229 return (ret);
230 }
231
fd_gets(BIO * bp,char * buf,int size)232 static int fd_gets(BIO *bp, char *buf, int size)
233 {
234 int ret = 0;
235 char *ptr = buf;
236 char *end = buf + size - 1;
237
238 while ((ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n'))
239 ptr++;
240
241 ptr[0] = '\0';
242
243 if (buf[0] != '\0')
244 ret = strlen(buf);
245 return (ret);
246 }
247
BIO_fd_should_retry(int i)248 int BIO_fd_should_retry(int i)
249 {
250 int err;
251
252 if ((i == 0) || (i == -1)) {
253 err = get_last_sys_error();
254
255 # if defined(OPENSSL_SYS_WINDOWS) && 0/* more microsoft stupidity? perhaps
256 * not? Ben 4/1/99 */
257 if ((i == -1) && (err == 0))
258 return (1);
259 # endif
260
261 return (BIO_fd_non_fatal_error(err));
262 }
263 return (0);
264 }
265
BIO_fd_non_fatal_error(int err)266 int BIO_fd_non_fatal_error(int err)
267 {
268 switch (err) {
269
270 # ifdef EWOULDBLOCK
271 # ifdef WSAEWOULDBLOCK
272 # if WSAEWOULDBLOCK != EWOULDBLOCK
273 case EWOULDBLOCK:
274 # endif
275 # else
276 case EWOULDBLOCK:
277 # endif
278 # endif
279
280 # if defined(ENOTCONN)
281 case ENOTCONN:
282 # endif
283
284 # ifdef EINTR
285 case EINTR:
286 # endif
287
288 # ifdef EAGAIN
289 # if EWOULDBLOCK != EAGAIN
290 case EAGAIN:
291 # endif
292 # endif
293
294 # ifdef EPROTO
295 case EPROTO:
296 # endif
297
298 # ifdef EINPROGRESS
299 case EINPROGRESS:
300 # endif
301
302 # ifdef EALREADY
303 case EALREADY:
304 # endif
305 return (1);
306 /* break; */
307 default:
308 break;
309 }
310 return (0);
311 }
312 #endif
313