lib/libcrypto/bio/bss_fd.c

   1 /* $OpenBSD: bss_fd.c,v 1.18 2015/02/12 03:54:07 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 }