1 /* $OpenBSD: bss_fd.c,v 1.17 2014/07/11 08:44:47 jsing 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 #if defined(OPENSSL_NO_POSIX_IO) 67 /* 68 * One can argue that one should implement dummy placeholder for 69 * BIO_s_fd here... 70 */ 71 #else 72 #include <openssl/bio.h> 73 74 static int fd_write(BIO *h, const char *buf, int num); 75 static int fd_read(BIO *h, char *buf, int size); 76 static int fd_puts(BIO *h, const char *str); 77 static int fd_gets(BIO *h, char *buf, int size); 78 static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2); 79 static int fd_new(BIO *h); 80 static int fd_free(BIO *data); 81 int BIO_fd_should_retry(int s); 82 83 static BIO_METHOD methods_fdp = { 84 .type = BIO_TYPE_FD, 85 .name = "file descriptor", 86 .bwrite = fd_write, 87 .bread = fd_read, 88 .bputs = fd_puts, 89 .bgets = fd_gets, 90 .ctrl = fd_ctrl, 91 .create = fd_new, 92 .destroy = fd_free 93 }; 94 95 BIO_METHOD * 96 BIO_s_fd(void) 97 { 98 return (&methods_fdp); 99 } 100 101 BIO * 102 BIO_new_fd(int fd, int close_flag) 103 { 104 BIO *ret; 105 ret = BIO_new(BIO_s_fd()); 106 if (ret == NULL) 107 return (NULL); 108 BIO_set_fd(ret, fd, close_flag); 109 return (ret); 110 } 111 112 static int 113 fd_new(BIO *bi) 114 { 115 bi->init = 0; 116 bi->num = -1; 117 bi->ptr = NULL; 118 bi->flags=0; 119 return (1); 120 } 121 122 static int 123 fd_free(BIO *a) 124 { 125 if (a == NULL) 126 return (0); 127 if (a->shutdown) { 128 if (a->init) { 129 close(a->num); 130 } 131 a->init = 0; 132 a->flags = 0; 133 } 134 return (1); 135 } 136 137 static int 138 fd_read(BIO *b, char *out, int outl) 139 { 140 int ret = 0; 141 142 if (out != NULL) { 143 errno = 0; 144 ret = read(b->num, out, outl); 145 BIO_clear_retry_flags(b); 146 if (ret <= 0) { 147 if (BIO_fd_should_retry(ret)) 148 BIO_set_retry_read(b); 149 } 150 } 151 return (ret); 152 } 153 154 static int 155 fd_write(BIO *b, const char *in, int inl) 156 { 157 int ret; 158 errno = 0; 159 ret = write(b->num, in, inl); 160 BIO_clear_retry_flags(b); 161 if (ret <= 0) { 162 if (BIO_fd_should_retry(ret)) 163 BIO_set_retry_write(b); 164 } 165 return (ret); 166 } 167 168 static long 169 fd_ctrl(BIO *b, int cmd, long num, void *ptr) 170 { 171 long ret = 1; 172 int *ip; 173 174 switch (cmd) { 175 case BIO_CTRL_RESET: 176 num = 0; 177 case BIO_C_FILE_SEEK: 178 ret = (long)lseek(b->num, num, 0); 179 break; 180 case BIO_C_FILE_TELL: 181 case BIO_CTRL_INFO: 182 ret = (long)lseek(b->num, 0, 1); 183 break; 184 case BIO_C_SET_FD: 185 fd_free(b); 186 b->num= *((int *)ptr); 187 b->shutdown = (int)num; 188 b->init = 1; 189 break; 190 case BIO_C_GET_FD: 191 if (b->init) { 192 ip = (int *)ptr; 193 if (ip != NULL) 194 *ip = b->num; 195 ret = b->num; 196 } else 197 ret = -1; 198 break; 199 case BIO_CTRL_GET_CLOSE: 200 ret = b->shutdown; 201 break; 202 case BIO_CTRL_SET_CLOSE: 203 b->shutdown = (int)num; 204 break; 205 case BIO_CTRL_PENDING: 206 case BIO_CTRL_WPENDING: 207 ret = 0; 208 break; 209 case BIO_CTRL_DUP: 210 case BIO_CTRL_FLUSH: 211 ret = 1; 212 break; 213 default: 214 ret = 0; 215 break; 216 } 217 return (ret); 218 } 219 220 static int 221 fd_puts(BIO *bp, const char *str) 222 { 223 int n, ret; 224 225 n = strlen(str); 226 ret = fd_write(bp, str, n); 227 return (ret); 228 } 229 230 static int 231 fd_gets(BIO *bp, char *buf, int size) 232 { 233 int ret = 0; 234 char *ptr = buf; 235 char *end = buf + size - 1; 236 237 while ((ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n')) 238 ptr++; 239 240 ptr[0] = '\0'; 241 242 if (buf[0] != '\0') 243 ret = strlen(buf); 244 return (ret); 245 } 246 247 int 248 BIO_fd_should_retry(int i) 249 { 250 int err; 251 252 if ((i == 0) || (i == -1)) { 253 err = errno; 254 return (BIO_fd_non_fatal_error(err)); 255 } 256 return (0); 257 } 258 259 int 260 BIO_fd_non_fatal_error(int err) 261 { 262 switch (err) { 263 case ENOTCONN: 264 case EINTR: 265 case EAGAIN: 266 case EINPROGRESS: 267 case EALREADY: 268 return (1); 269 default: 270 break; 271 } 272 return (0); 273 } 274 #endif 275