Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/bio/bss_fd.c */ |
| 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 <stdio.h> |
| 60 | #include <errno.h> |
| 61 | #define USE_SOCKETS |
| 62 | #include "cryptlib.h" |
| 63 | |
| 64 | #if defined(OPENSSL_NO_POSIX_IO) |
| 65 | /* |
| 66 | * One can argue that one should implement dummy placeholder for |
| 67 | * BIO_s_fd here... |
| 68 | */ |
| 69 | #else |
| 70 | /* |
| 71 | * As for unconditional usage of "UPLINK" interface in this module. |
| 72 | * Trouble is that unlike Unix file descriptors [which are indexes |
| 73 | * in kernel-side per-process table], corresponding descriptors on |
| 74 | * platforms which require "UPLINK" interface seem to be indexes |
| 75 | * in a user-land, non-global table. Well, in fact they are indexes |
| 76 | * in stdio _iob[], and recall that _iob[] was the very reason why |
| 77 | * "UPLINK" interface was introduced in first place. But one way on |
| 78 | * another. Neither libcrypto or libssl use this BIO meaning that |
| 79 | * file descriptors can only be provided by application. Therefore |
| 80 | * "UPLINK" calls are due... |
| 81 | */ |
| 82 | #include "bio_lcl.h" |
| 83 | |
| 84 | static int fd_write(BIO *h, const char *buf, int num); |
| 85 | static int fd_read(BIO *h, char *buf, int size); |
| 86 | static int fd_puts(BIO *h, const char *str); |
| 87 | static int fd_gets(BIO *h, char *buf, int size); |
| 88 | static long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2); |
| 89 | static int fd_new(BIO *h); |
| 90 | static int fd_free(BIO *data); |
| 91 | int BIO_fd_should_retry(int s); |
| 92 | |
| 93 | static BIO_METHOD methods_fdp= |
| 94 | { |
| 95 | BIO_TYPE_FD,"file descriptor", |
| 96 | fd_write, |
| 97 | fd_read, |
| 98 | fd_puts, |
| 99 | fd_gets, |
| 100 | fd_ctrl, |
| 101 | fd_new, |
| 102 | fd_free, |
| 103 | NULL, |
| 104 | }; |
| 105 | |
| 106 | BIO_METHOD *BIO_s_fd(void) |
| 107 | { |
| 108 | return(&methods_fdp); |
| 109 | } |
| 110 | |
| 111 | BIO *BIO_new_fd(int fd,int close_flag) |
| 112 | { |
| 113 | BIO *ret; |
| 114 | ret=BIO_new(BIO_s_fd()); |
| 115 | if (ret == NULL) return(NULL); |
| 116 | BIO_set_fd(ret,fd,close_flag); |
| 117 | return(ret); |
| 118 | } |
| 119 | |
| 120 | static int fd_new(BIO *bi) |
| 121 | { |
| 122 | bi->init=0; |
| 123 | bi->num=-1; |
| 124 | bi->ptr=NULL; |
| 125 | bi->flags=BIO_FLAGS_UPLINK; /* essentially redundant */ |
| 126 | return(1); |
| 127 | } |
| 128 | |
| 129 | static int fd_free(BIO *a) |
| 130 | { |
| 131 | if (a == NULL) return(0); |
| 132 | if (a->shutdown) |
| 133 | { |
| 134 | if (a->init) |
| 135 | { |
| 136 | UP_close(a->num); |
| 137 | } |
| 138 | a->init=0; |
| 139 | a->flags=BIO_FLAGS_UPLINK; |
| 140 | } |
| 141 | return(1); |
| 142 | } |
| 143 | |
| 144 | static int fd_read(BIO *b, char *out,int outl) |
| 145 | { |
| 146 | int ret=0; |
| 147 | |
| 148 | if (out != NULL) |
| 149 | { |
| 150 | clear_sys_error(); |
| 151 | ret=UP_read(b->num,out,outl); |
| 152 | BIO_clear_retry_flags(b); |
| 153 | if (ret <= 0) |
| 154 | { |
| 155 | if (BIO_fd_should_retry(ret)) |
| 156 | BIO_set_retry_read(b); |
| 157 | } |
| 158 | } |
| 159 | return(ret); |
| 160 | } |
| 161 | |
| 162 | static int fd_write(BIO *b, const char *in, int inl) |
| 163 | { |
| 164 | int ret; |
| 165 | clear_sys_error(); |
| 166 | ret=UP_write(b->num,in,inl); |
| 167 | BIO_clear_retry_flags(b); |
| 168 | if (ret <= 0) |
| 169 | { |
| 170 | if (BIO_fd_should_retry(ret)) |
| 171 | BIO_set_retry_write(b); |
| 172 | } |
| 173 | return(ret); |
| 174 | } |
| 175 | |
| 176 | static long fd_ctrl(BIO *b, int cmd, long num, void *ptr) |
| 177 | { |
| 178 | long ret=1; |
| 179 | int *ip; |
| 180 | |
| 181 | switch (cmd) |
| 182 | { |
| 183 | case BIO_CTRL_RESET: |
| 184 | num=0; |
| 185 | case BIO_C_FILE_SEEK: |
| 186 | ret=(long)UP_lseek(b->num,num,0); |
| 187 | break; |
| 188 | case BIO_C_FILE_TELL: |
| 189 | case BIO_CTRL_INFO: |
| 190 | ret=(long)UP_lseek(b->num,0,1); |
| 191 | break; |
| 192 | case BIO_C_SET_FD: |
| 193 | fd_free(b); |
| 194 | b->num= *((int *)ptr); |
| 195 | b->shutdown=(int)num; |
| 196 | b->init=1; |
| 197 | break; |
| 198 | case BIO_C_GET_FD: |
| 199 | if (b->init) |
| 200 | { |
| 201 | ip=(int *)ptr; |
| 202 | if (ip != NULL) *ip=b->num; |
| 203 | ret=b->num; |
| 204 | } |
| 205 | else |
| 206 | ret= -1; |
| 207 | break; |
| 208 | case BIO_CTRL_GET_CLOSE: |
| 209 | ret=b->shutdown; |
| 210 | break; |
| 211 | case BIO_CTRL_SET_CLOSE: |
| 212 | b->shutdown=(int)num; |
| 213 | break; |
| 214 | case BIO_CTRL_PENDING: |
| 215 | case BIO_CTRL_WPENDING: |
| 216 | ret=0; |
| 217 | break; |
| 218 | case BIO_CTRL_DUP: |
| 219 | case BIO_CTRL_FLUSH: |
| 220 | ret=1; |
| 221 | break; |
| 222 | default: |
| 223 | ret=0; |
| 224 | break; |
| 225 | } |
| 226 | return(ret); |
| 227 | } |
| 228 | |
| 229 | static int fd_puts(BIO *bp, const char *str) |
| 230 | { |
| 231 | int n,ret; |
| 232 | |
| 233 | n=strlen(str); |
| 234 | ret=fd_write(bp,str,n); |
| 235 | return(ret); |
| 236 | } |
| 237 | |
| 238 | static int fd_gets(BIO *bp, char *buf, int size) |
| 239 | { |
| 240 | int ret=0; |
| 241 | char *ptr=buf; |
| 242 | char *end=buf+size-1; |
| 243 | |
| 244 | while ( (ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n') ) |
| 245 | ptr++; |
| 246 | |
| 247 | ptr[0]='\0'; |
| 248 | |
| 249 | if (buf[0] != '\0') |
| 250 | ret=strlen(buf); |
| 251 | return(ret); |
| 252 | } |
| 253 | |
| 254 | int BIO_fd_should_retry(int i) |
| 255 | { |
| 256 | int err; |
| 257 | |
| 258 | if ((i == 0) || (i == -1)) |
| 259 | { |
| 260 | err=get_last_sys_error(); |
| 261 | |
| 262 | #if defined(OPENSSL_SYS_WINDOWS) && 0 /* more microsoft stupidity? perhaps not? Ben 4/1/99 */ |
| 263 | if ((i == -1) && (err == 0)) |
| 264 | return(1); |
| 265 | #endif |
| 266 | |
| 267 | return(BIO_fd_non_fatal_error(err)); |
| 268 | } |
| 269 | return(0); |
| 270 | } |
| 271 | |
| 272 | int BIO_fd_non_fatal_error(int err) |
| 273 | { |
| 274 | switch (err) |
| 275 | { |
| 276 | |
| 277 | #ifdef EWOULDBLOCK |
| 278 | # ifdef WSAEWOULDBLOCK |
| 279 | # if WSAEWOULDBLOCK != EWOULDBLOCK |
| 280 | case EWOULDBLOCK: |
| 281 | # endif |
| 282 | # else |
| 283 | case EWOULDBLOCK: |
| 284 | # endif |
| 285 | #endif |
| 286 | |
| 287 | #if defined(ENOTCONN) |
| 288 | case ENOTCONN: |
| 289 | #endif |
| 290 | |
| 291 | #ifdef EINTR |
| 292 | case EINTR: |
| 293 | #endif |
| 294 | |
| 295 | #ifdef EAGAIN |
| 296 | #if EWOULDBLOCK != EAGAIN |
| 297 | case EAGAIN: |
| 298 | # endif |
| 299 | #endif |
| 300 | |
| 301 | #ifdef EPROTO |
| 302 | case EPROTO: |
| 303 | #endif |
| 304 | |
| 305 | #ifdef EINPROGRESS |
| 306 | case EINPROGRESS: |
| 307 | #endif |
| 308 | |
| 309 | #ifdef EALREADY |
| 310 | case EALREADY: |
| 311 | #endif |
| 312 | return(1); |
| 313 | /* break; */ |
| 314 | default: |
| 315 | break; |
| 316 | } |
| 317 | return(0); |
| 318 | } |
| 319 | #endif |