1 /* $OpenBSD: bss_fd.c,v 1.21 2023/07/05 21:23:37 beck Exp $ */
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 <errno.h>
60 #include <stdio.h>
61 #include <string.h>
62 #include <unistd.h>
63
64 #include <openssl/opensslconf.h>
65
66 #include <openssl/bio.h>
67
68 #include "bio_local.h"
69
70 static int fd_write(BIO *h, const char *buf, int num);
71 static int fd_read(BIO *h, char *buf, int size);
72 static int fd_puts(BIO *h, const char *str);
73 static int fd_gets(BIO *h, char *buf, int size);
74 static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2);
75 static int fd_new(BIO *h);
76 static int fd_free(BIO *data);
77 int BIO_fd_should_retry(int s);
78
79 static const BIO_METHOD methods_fdp = {
80 .type = BIO_TYPE_FD,
81 .name = "file descriptor",
82 .bwrite = fd_write,
83 .bread = fd_read,
84 .bputs = fd_puts,
85 .bgets = fd_gets,
86 .ctrl = fd_ctrl,
87 .create = fd_new,
88 .destroy = fd_free
89 };
90
91 const BIO_METHOD *
BIO_s_fd(void)92 BIO_s_fd(void)
93 {
94 return (&methods_fdp);
95 }
96 LCRYPTO_ALIAS(BIO_s_fd);
97
98 BIO *
BIO_new_fd(int fd,int close_flag)99 BIO_new_fd(int fd, int close_flag)
100 {
101 BIO *ret;
102 ret = BIO_new(BIO_s_fd());
103 if (ret == NULL)
104 return (NULL);
105 BIO_set_fd(ret, fd, close_flag);
106 return (ret);
107 }
108 LCRYPTO_ALIAS(BIO_new_fd);
109
110 static int
fd_new(BIO * bi)111 fd_new(BIO *bi)
112 {
113 bi->init = 0;
114 bi->num = -1;
115 bi->ptr = NULL;
116 bi->flags=0;
117 return (1);
118 }
119
120 static int
fd_free(BIO * a)121 fd_free(BIO *a)
122 {
123 if (a == NULL)
124 return (0);
125 if (a->shutdown) {
126 if (a->init) {
127 close(a->num);
128 }
129 a->init = 0;
130 a->flags = 0;
131 }
132 return (1);
133 }
134
135 static int
fd_read(BIO * b,char * out,int outl)136 fd_read(BIO *b, char *out, int outl)
137 {
138 int ret = 0;
139
140 if (out != NULL) {
141 errno = 0;
142 ret = read(b->num, out, outl);
143 BIO_clear_retry_flags(b);
144 if (ret <= 0) {
145 if (BIO_fd_should_retry(ret))
146 BIO_set_retry_read(b);
147 }
148 }
149 return (ret);
150 }
151
152 static int
fd_write(BIO * b,const char * in,int inl)153 fd_write(BIO *b, const char *in, int inl)
154 {
155 int ret;
156 errno = 0;
157 ret = write(b->num, in, inl);
158 BIO_clear_retry_flags(b);
159 if (ret <= 0) {
160 if (BIO_fd_should_retry(ret))
161 BIO_set_retry_write(b);
162 }
163 return (ret);
164 }
165
166 static long
fd_ctrl(BIO * b,int cmd,long num,void * ptr)167 fd_ctrl(BIO *b, int cmd, long num, void *ptr)
168 {
169 long ret = 1;
170 int *ip;
171
172 switch (cmd) {
173 case BIO_CTRL_RESET:
174 num = 0;
175 case BIO_C_FILE_SEEK:
176 ret = (long)lseek(b->num, num, 0);
177 break;
178 case BIO_C_FILE_TELL:
179 case BIO_CTRL_INFO:
180 ret = (long)lseek(b->num, 0, 1);
181 break;
182 case BIO_C_SET_FD:
183 fd_free(b);
184 b->num= *((int *)ptr);
185 b->shutdown = (int)num;
186 b->init = 1;
187 break;
188 case BIO_C_GET_FD:
189 if (b->init) {
190 ip = (int *)ptr;
191 if (ip != NULL)
192 *ip = b->num;
193 ret = b->num;
194 } else
195 ret = -1;
196 break;
197 case BIO_CTRL_GET_CLOSE:
198 ret = b->shutdown;
199 break;
200 case BIO_CTRL_SET_CLOSE:
201 b->shutdown = (int)num;
202 break;
203 case BIO_CTRL_PENDING:
204 case BIO_CTRL_WPENDING:
205 ret = 0;
206 break;
207 case BIO_CTRL_DUP:
208 case BIO_CTRL_FLUSH:
209 ret = 1;
210 break;
211 default:
212 ret = 0;
213 break;
214 }
215 return (ret);
216 }
217
218 static int
fd_puts(BIO * bp,const char * str)219 fd_puts(BIO *bp, const char *str)
220 {
221 int n, ret;
222
223 n = strlen(str);
224 ret = fd_write(bp, str, n);
225 return (ret);
226 }
227
228 static int
fd_gets(BIO * bp,char * buf,int size)229 fd_gets(BIO *bp, char *buf, int size)
230 {
231 int ret = 0;
232 char *ptr = buf;
233 char *end = buf + size - 1;
234
235 while ((ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n'))
236 ptr++;
237
238 ptr[0] = '\0';
239
240 if (buf[0] != '\0')
241 ret = strlen(buf);
242 return (ret);
243 }
244
245 int
BIO_fd_should_retry(int i)246 BIO_fd_should_retry(int i)
247 {
248 int err;
249
250 if ((i == 0) || (i == -1)) {
251 err = errno;
252 return (BIO_fd_non_fatal_error(err));
253 }
254 return (0);
255 }
256 LCRYPTO_ALIAS(BIO_fd_should_retry);
257
258 int
BIO_fd_non_fatal_error(int err)259 BIO_fd_non_fatal_error(int err)
260 {
261 switch (err) {
262 case ENOTCONN:
263 case EINTR:
264 case EAGAIN:
265 case EINPROGRESS:
266 case EALREADY:
267 return (1);
268 default:
269 break;
270 }
271 return (0);
272 }
273 LCRYPTO_ALIAS(BIO_fd_non_fatal_error);
274