1 /* $OpenBSD: bss_fd.c,v 1.20 2022/01/07 09:02:17 tb 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
97 BIO *
BIO_new_fd(int fd,int close_flag)98 BIO_new_fd(int fd, int close_flag)
99 {
100 BIO *ret;
101 ret = BIO_new(BIO_s_fd());
102 if (ret == NULL)
103 return (NULL);
104 BIO_set_fd(ret, fd, close_flag);
105 return (ret);
106 }
107
108 static int
fd_new(BIO * bi)109 fd_new(BIO *bi)
110 {
111 bi->init = 0;
112 bi->num = -1;
113 bi->ptr = NULL;
114 bi->flags=0;
115 return (1);
116 }
117
118 static int
fd_free(BIO * a)119 fd_free(BIO *a)
120 {
121 if (a == NULL)
122 return (0);
123 if (a->shutdown) {
124 if (a->init) {
125 close(a->num);
126 }
127 a->init = 0;
128 a->flags = 0;
129 }
130 return (1);
131 }
132
133 static int
fd_read(BIO * b,char * out,int outl)134 fd_read(BIO *b, char *out, int outl)
135 {
136 int ret = 0;
137
138 if (out != NULL) {
139 errno = 0;
140 ret = read(b->num, out, outl);
141 BIO_clear_retry_flags(b);
142 if (ret <= 0) {
143 if (BIO_fd_should_retry(ret))
144 BIO_set_retry_read(b);
145 }
146 }
147 return (ret);
148 }
149
150 static int
fd_write(BIO * b,const char * in,int inl)151 fd_write(BIO *b, const char *in, int inl)
152 {
153 int ret;
154 errno = 0;
155 ret = write(b->num, in, inl);
156 BIO_clear_retry_flags(b);
157 if (ret <= 0) {
158 if (BIO_fd_should_retry(ret))
159 BIO_set_retry_write(b);
160 }
161 return (ret);
162 }
163
164 static long
fd_ctrl(BIO * b,int cmd,long num,void * ptr)165 fd_ctrl(BIO *b, int cmd, long num, void *ptr)
166 {
167 long ret = 1;
168 int *ip;
169
170 switch (cmd) {
171 case BIO_CTRL_RESET:
172 num = 0;
173 case BIO_C_FILE_SEEK:
174 ret = (long)lseek(b->num, num, 0);
175 break;
176 case BIO_C_FILE_TELL:
177 case BIO_CTRL_INFO:
178 ret = (long)lseek(b->num, 0, 1);
179 break;
180 case BIO_C_SET_FD:
181 fd_free(b);
182 b->num= *((int *)ptr);
183 b->shutdown = (int)num;
184 b->init = 1;
185 break;
186 case BIO_C_GET_FD:
187 if (b->init) {
188 ip = (int *)ptr;
189 if (ip != NULL)
190 *ip = b->num;
191 ret = b->num;
192 } else
193 ret = -1;
194 break;
195 case BIO_CTRL_GET_CLOSE:
196 ret = b->shutdown;
197 break;
198 case BIO_CTRL_SET_CLOSE:
199 b->shutdown = (int)num;
200 break;
201 case BIO_CTRL_PENDING:
202 case BIO_CTRL_WPENDING:
203 ret = 0;
204 break;
205 case BIO_CTRL_DUP:
206 case BIO_CTRL_FLUSH:
207 ret = 1;
208 break;
209 default:
210 ret = 0;
211 break;
212 }
213 return (ret);
214 }
215
216 static int
fd_puts(BIO * bp,const char * str)217 fd_puts(BIO *bp, const char *str)
218 {
219 int n, ret;
220
221 n = strlen(str);
222 ret = fd_write(bp, str, n);
223 return (ret);
224 }
225
226 static int
fd_gets(BIO * bp,char * buf,int size)227 fd_gets(BIO *bp, char *buf, int size)
228 {
229 int ret = 0;
230 char *ptr = buf;
231 char *end = buf + size - 1;
232
233 while ((ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n'))
234 ptr++;
235
236 ptr[0] = '\0';
237
238 if (buf[0] != '\0')
239 ret = strlen(buf);
240 return (ret);
241 }
242
243 int
BIO_fd_should_retry(int i)244 BIO_fd_should_retry(int i)
245 {
246 int err;
247
248 if ((i == 0) || (i == -1)) {
249 err = errno;
250 return (BIO_fd_non_fatal_error(err));
251 }
252 return (0);
253 }
254
255 int
BIO_fd_non_fatal_error(int err)256 BIO_fd_non_fatal_error(int err)
257 {
258 switch (err) {
259 case ENOTCONN:
260 case EINTR:
261 case EAGAIN:
262 case EINPROGRESS:
263 case EALREADY:
264 return (1);
265 default:
266 break;
267 }
268 return (0);
269 }
270