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 * 92 BIO_s_fd(void) 93 { 94 return (&methods_fdp); 95 } 96 97 BIO * 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 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 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 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 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 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 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 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 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 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