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