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 {
95 BIO_TYPE_FD,"file descriptor",
96 fd_write,
97 fd_read,
98 fd_puts,
99 fd_gets,
100 fd_ctrl,
101 fd_new,
102 fd_free,
103 NULL,
104 };
105
106 BIO_METHOD *BIO_s_fd(void)
107 {
108 return(&methods_fdp);
109 }
110
111 BIO *BIO_new_fd(int fd,int close_flag)
112 {
113 BIO *ret;
114 ret=BIO_new(BIO_s_fd());
115 if (ret == NULL) return(NULL);
116 BIO_set_fd(ret,fd,close_flag);
117 return(ret);
118 }
119
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
129 static int fd_free(BIO *a)
130 {
131 if (a == NULL) return(0);
132 if (a->shutdown)
133 {
134 if (a->init)
135 {
136 UP_close(a->num);
137 }
138 a->init=0;
139 a->flags=BIO_FLAGS_UPLINK;
140 }
141 return(1);
142 }
143
144 static int fd_read(BIO *b, char *out,int outl)
145 {
146 int ret=0;
147
148 if (out != NULL)
149 {
150 clear_sys_error();
151 ret=UP_read(b->num,out,outl);
152 BIO_clear_retry_flags(b);
153 if (ret <= 0)
154 {
155 if (BIO_fd_should_retry(ret))
156 BIO_set_retry_read(b);
157 }
158 }
159 return(ret);
160 }
161
162 static int fd_write(BIO *b, const char *in, int inl)
163 {
164 int ret;
165 clear_sys_error();
166 ret=UP_write(b->num,in,inl);
167 BIO_clear_retry_flags(b);
168 if (ret <= 0)
169 {
170 if (BIO_fd_should_retry(ret))
171 BIO_set_retry_write(b);
172 }
173 return(ret);
174 }
175
176 static long fd_ctrl(BIO *b, int cmd, long num, void *ptr)
177 {
178 long ret=1;
179 int *ip;
180
181 switch (cmd)
182 {
183 case BIO_CTRL_RESET:
184 num=0;
185 case BIO_C_FILE_SEEK:
186 ret=(long)UP_lseek(b->num,num,0);
187 break;
188 case BIO_C_FILE_TELL:
189 case BIO_CTRL_INFO:
190 ret=(long)UP_lseek(b->num,0,1);
191 break;
192 case BIO_C_SET_FD:
193 fd_free(b);
194 b->num= *((int *)ptr);
195 b->shutdown=(int)num;
196 b->init=1;
197 break;
198 case BIO_C_GET_FD:
199 if (b->init)
200 {
201 ip=(int *)ptr;
202 if (ip != NULL) *ip=b->num;
203 ret=b->num;
204 }
205 else
206 ret= -1;
207 break;
208 case BIO_CTRL_GET_CLOSE:
209 ret=b->shutdown;
210 break;
211 case BIO_CTRL_SET_CLOSE:
212 b->shutdown=(int)num;
213 break;
214 case BIO_CTRL_PENDING:
215 case BIO_CTRL_WPENDING:
216 ret=0;
217 break;
218 case BIO_CTRL_DUP:
219 case BIO_CTRL_FLUSH:
220 ret=1;
221 break;
222 default:
223 ret=0;
224 break;
225 }
226 return(ret);
227 }
228
229 static int fd_puts(BIO *bp, const char *str)
230 {
231 int n,ret;
232
233 n=strlen(str);
234 ret=fd_write(bp,str,n);
235 return(ret);
236 }
237
238 static int fd_gets(BIO *bp, char *buf, int size)
239 {
240 int ret=0;
241 char *ptr=buf;
242 char *end=buf+size-1;
243
244 while ( (ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n') )
245 ptr++;
246
247 ptr[0]='\0';
248
249 if (buf[0] != '\0')
250 ret=strlen(buf);
251 return(ret);
252 }
253
254 int BIO_fd_should_retry(int i)
255 {
256 int err;
257
258 if ((i == 0) || (i == -1))
259 {
260 err=get_last_sys_error();
261
262 #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */
263 if ((i == -1) && (err == 0))
264 return(1);
265 #endif
266
267 return(BIO_fd_non_fatal_error(err));
268 }
269 return(0);
270 }
271
272 int BIO_fd_non_fatal_error(int err)
273 {
274 switch (err)
275 {
276
277 #ifdef EWOULDBLOCK
278 # ifdef WSAEWOULDBLOCK
279 # if WSAEWOULDBLOCK != EWOULDBLOCK
280 case EWOULDBLOCK:
281 # endif
282 # else
283 case EWOULDBLOCK:
284 # endif
285 #endif
286
287 #if defined(ENOTCONN)
288 case ENOTCONN:
289 #endif
290
291 #ifdef EINTR
292 case EINTR:
293 #endif
294
295 #ifdef EAGAIN
296 #if EWOULDBLOCK != EAGAIN
297 case EAGAIN:
298 # endif
299 #endif
300
301 #ifdef EPROTO
302 case EPROTO:
303 #endif
304
305 #ifdef EINPROGRESS
306 case EINPROGRESS:
307 #endif
308
309 #ifdef EALREADY
310 case EALREADY:
311 #endif
312 return(1);
313 /* break; */
314 default:
315 break;
316 }
317 return(0);
318 }
319 #endif