crypto/bio/bss_file.c

   1 /*
   2  * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #ifndef HEADER_BSS_FILE_C
  11 # define HEADER_BSS_FILE_C
  12
  13 # if defined(__linux) || defined(__sun) || defined(__hpux)
  14 /*
  15  * Following definition aliases fopen to fopen64 on above mentioned
  16  * platforms. This makes it possible to open and sequentially access files
  17  * larger than 2GB from 32-bit application. It does not allow to traverse
  18  * them beyond 2GB with fseek/ftell, but on the other hand *no* 32-bit
  19  * platform permits that, not with fseek/ftell. Not to mention that breaking
  20  * 2GB limit for seeking would require surgery to *our* API. But sequential
  21  * access suffices for practical cases when you can run into large files,
  22  * such as fingerprinting, so we can let API alone. For reference, the list
  23  * of 32-bit platforms which allow for sequential access of large files
  24  * without extra "magic" comprise *BSD, Darwin, IRIX...
  25  */
  26 #  ifndef _FILE_OFFSET_BITS
  27 #   define _FILE_OFFSET_BITS 64
  28 #  endif
  29 # endif
  30
  31 # include <stdio.h>
  32 # include <errno.h>
  33 # include "bio_lcl.h"
  34 # include <openssl/err.h>
  35
  36 # if !defined(OPENSSL_NO_STDIO)
  37
  38 static int file_write(BIO *h, const char *buf, int num);
  39 static int file_read(BIO *h, char *buf, int size);
  40 static int file_puts(BIO *h, const char *str);
  41 static int file_gets(BIO *h, char *str, int size);
  42 static long file_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  43 static int file_new(BIO *h);
  44 static int file_free(BIO *data);
  45 static const BIO_METHOD methods_filep = {
  46     BIO_TYPE_FILE,
  47     "FILE pointer",
  48     /* TODO: Convert to new style write function */
  49     bwrite_conv,
  50     file_write,
  51     /* TODO: Convert to new style read function */
  52     bread_conv,
  53     file_read,
  54     file_puts,
  55     file_gets,
  56     file_ctrl,
  57     file_new,
  58     file_free,
  59     NULL,
  60 };
  61
  62 BIO *BIO_new_file(const char *filename, const char *mode)
  63 {
  64     BIO  *ret;
  65     FILE *file = openssl_fopen(filename, mode);
  66     int fp_flags = BIO_CLOSE;
  67
  68     if (strchr(mode, 'b') == NULL)
  69         fp_flags |= BIO_FP_TEXT;
  70
  71     if (file == NULL) {
  72         SYSerr(SYS_F_FOPEN, get_last_sys_error());
  73         ERR_add_error_data(5, "fopen('", filename, "','", mode, "')");
  74         if (errno == ENOENT
  75 # ifdef ENXIO
  76             || errno == ENXIO
  77 # endif
  78             )
  79             BIOerr(BIO_F_BIO_NEW_FILE, BIO_R_NO_SUCH_FILE);
  80         else
  81             BIOerr(BIO_F_BIO_NEW_FILE, ERR_R_SYS_LIB);
  82         return NULL;
  83     }
  84     if ((ret = BIO_new(BIO_s_file())) == NULL) {
  85         fclose(file);
  86         return NULL;
  87     }
  88
  89     BIO_clear_flags(ret, BIO_FLAGS_UPLINK); /* we did fopen -> we disengage
  90                                              * UPLINK */
  91     BIO_set_fp(ret, file, fp_flags);
  92     return ret;
  93 }
  94
  95 BIO *BIO_new_fp(FILE *stream, int close_flag)
  96 {
  97     BIO *ret;
  98
  99     if ((ret = BIO_new(BIO_s_file())) == NULL)
 100         return NULL;
 101
 102     /* redundant flag, left for documentation purposes */
 103     BIO_set_flags(ret, BIO_FLAGS_UPLINK);
 104     BIO_set_fp(ret, stream, close_flag);
 105     return ret;
 106 }
 107
 108 const BIO_METHOD *BIO_s_file(void)
 109 {
 110     return &methods_filep;
 111 }
 112
 113 static int file_new(BIO *bi)
 114 {
 115     bi->init = 0;
 116     bi->num = 0;
 117     bi->ptr = NULL;
 118     bi->flags = BIO_FLAGS_UPLINK; /* default to UPLINK */
 119     return 1;
 120 }
 121
 122 static int file_free(BIO *a)
 123 {
 124     if (a == NULL)
 125         return 0;
 126     if (a->shutdown) {
 127         if ((a->init) && (a->ptr != NULL)) {
 128             if (a->flags & BIO_FLAGS_UPLINK)
 129                 UP_fclose(a->ptr);
 130             else
 131                 fclose(a->ptr);
 132             a->ptr = NULL;
 133             a->flags = BIO_FLAGS_UPLINK;
 134         }
 135         a->init = 0;
 136     }
 137     return 1;
 138 }
 139
 140 static int file_read(BIO *b, char *out, int outl)
 141 {
 142     int ret = 0;
 143
 144     if (b->init && (out != NULL)) {
 145         if (b->flags & BIO_FLAGS_UPLINK)
 146             ret = UP_fread(out, 1, (int)outl, b->ptr);
 147         else
 148             ret = fread(out, 1, (int)outl, (FILE *)b->ptr);
 149         if (ret == 0
 150             && (b->flags & BIO_FLAGS_UPLINK) ? UP_ferror((FILE *)b->ptr) :
 151                                                ferror((FILE *)b->ptr)) {
 152             SYSerr(SYS_F_FREAD, get_last_sys_error());
 153             BIOerr(BIO_F_FILE_READ, ERR_R_SYS_LIB);
 154             ret = -1;
 155         }
 156     }
 157     return ret;
 158 }
 159
 160 static int file_write(BIO *b, const char *in, int inl)
 161 {
 162     int ret = 0;
 163
 164     if (b->init && (in != NULL)) {
 165         if (b->flags & BIO_FLAGS_UPLINK)
 166             ret = UP_fwrite(in, (int)inl, 1, b->ptr);
 167         else
 168             ret = fwrite(in, (int)inl, 1, (FILE *)b->ptr);
 169         if (ret)
 170             ret = inl;
 171         /* ret=fwrite(in,1,(int)inl,(FILE *)b->ptr); */
 172         /*
 173          * according to Tim Hudson <tjh@openssl.org>, the commented out
 174          * version above can cause 'inl' write calls under some stupid stdio
 175          * implementations (VMS)
 176          */
 177     }
 178     return ret;
 179 }
 180
 181 static long file_ctrl(BIO *b, int cmd, long num, void *ptr)
 182 {
 183     long ret = 1;
 184     FILE *fp = (FILE *)b->ptr;
 185     FILE **fpp;
 186     char p[4];
 187     int st;
 188
 189     switch (cmd) {
 190     case BIO_C_FILE_SEEK:
 191     case BIO_CTRL_RESET:
 192         if (b->flags & BIO_FLAGS_UPLINK)
 193             ret = (long)UP_fseek(b->ptr, num, 0);
 194         else
 195             ret = (long)fseek(fp, num, 0);
 196         break;
 197     case BIO_CTRL_EOF:
 198         if (b->flags & BIO_FLAGS_UPLINK)
 199             ret = (long)UP_feof(fp);
 200         else
 201             ret = (long)feof(fp);
 202         break;
 203     case BIO_C_FILE_TELL:
 204     case BIO_CTRL_INFO:
 205         if (b->flags & BIO_FLAGS_UPLINK)
 206             ret = UP_ftell(b->ptr);
 207         else
 208             ret = ftell(fp);
 209         break;
 210     case BIO_C_SET_FILE_PTR:
 211         file_free(b);
 212         b->shutdown = (int)num & BIO_CLOSE;
 213         b->ptr = ptr;
 214         b->init = 1;
 215 #  if BIO_FLAGS_UPLINK!=0
 216 #   if defined(__MINGW32__) && defined(__MSVCRT__) && !defined(_IOB_ENTRIES)
 217 #    define _IOB_ENTRIES 20
 218 #   endif
 219         /* Safety net to catch purely internal BIO_set_fp calls */
 220 #   if defined(_MSC_VER) && _MSC_VER>=1900
 221         if (ptr == stdin || ptr == stdout || ptr == stderr)
 222             BIO_clear_flags(b, BIO_FLAGS_UPLINK);
 223 #   elif defined(_IOB_ENTRIES)
 224         if ((size_t)ptr >= (size_t)stdin &&
 225             (size_t)ptr < (size_t)(stdin + _IOB_ENTRIES))
 226             BIO_clear_flags(b, BIO_FLAGS_UPLINK);
 227 #   endif
 228 #  endif
 229 #  ifdef UP_fsetmod
 230         if (b->flags & BIO_FLAGS_UPLINK)
 231             UP_fsetmod(b->ptr, (char)((num & BIO_FP_TEXT) ? 't' : 'b'));
 232         else
 233 #  endif
 234         {
 235 #  if defined(OPENSSL_SYS_WINDOWS)
 236             int fd = _fileno((FILE *)ptr);
 237             if (num & BIO_FP_TEXT)
 238                 _setmode(fd, _O_TEXT);
 239             else
 240                 _setmode(fd, _O_BINARY);
 241 #  elif defined(OPENSSL_SYS_MSDOS)
 242             int fd = fileno((FILE *)ptr);
 243             /* Set correct text/binary mode */
 244             if (num & BIO_FP_TEXT)
 245                 _setmode(fd, _O_TEXT);
 246             /* Dangerous to set stdin/stdout to raw (unless redirected) */
 247             else {
 248                 if (fd == STDIN_FILENO || fd == STDOUT_FILENO) {
 249                     if (isatty(fd) <= 0)
 250                         _setmode(fd, _O_BINARY);
 251                 } else
 252                     _setmode(fd, _O_BINARY);
 253             }
 254 #  elif defined(OPENSSL_SYS_WIN32_CYGWIN)
 255             int fd = fileno((FILE *)ptr);
 256             if (num & BIO_FP_TEXT)
 257                 setmode(fd, O_TEXT);
 258             else
 259                 setmode(fd, O_BINARY);
 260 #  endif
 261         }
 262         break;
 263     case BIO_C_SET_FILENAME:
 264         file_free(b);
 265         b->shutdown = (int)num & BIO_CLOSE;
 266         if (num & BIO_FP_APPEND) {
 267             if (num & BIO_FP_READ)
 268                 OPENSSL_strlcpy(p, "a+", sizeof(p));
 269             else
 270                 OPENSSL_strlcpy(p, "a", sizeof(p));
 271         } else if ((num & BIO_FP_READ) && (num & BIO_FP_WRITE))
 272             OPENSSL_strlcpy(p, "r+", sizeof(p));
 273         else if (num & BIO_FP_WRITE)
 274             OPENSSL_strlcpy(p, "w", sizeof(p));
 275         else if (num & BIO_FP_READ)
 276             OPENSSL_strlcpy(p, "r", sizeof(p));
 277         else {
 278             BIOerr(BIO_F_FILE_CTRL, BIO_R_BAD_FOPEN_MODE);
 279             ret = 0;
 280             break;
 281         }
 282 #  if defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32_CYGWIN)
 283         if (!(num & BIO_FP_TEXT))
 284             OPENSSL_strlcat(p, "b", sizeof(p));
 285         else
 286             OPENSSL_strlcat(p, "t", sizeof(p));
 287 #  endif
 288         fp = openssl_fopen(ptr, p);
 289         if (fp == NULL) {
 290             SYSerr(SYS_F_FOPEN, get_last_sys_error());
 291             ERR_add_error_data(5, "fopen('", ptr, "','", p, "')");
 292             BIOerr(BIO_F_FILE_CTRL, ERR_R_SYS_LIB);
 293             ret = 0;
 294             break;
 295         }
 296         b->ptr = fp;
 297         b->init = 1;
 298         BIO_clear_flags(b, BIO_FLAGS_UPLINK); /* we did fopen -> we disengage
 299                                                * UPLINK */
 300         break;
 301     case BIO_C_GET_FILE_PTR:
 302         /* the ptr parameter is actually a FILE ** in this case. */
 303         if (ptr != NULL) {
 304             fpp = (FILE **)ptr;
 305             *fpp = (FILE *)b->ptr;
 306         }
 307         break;
 308     case BIO_CTRL_GET_CLOSE:
 309         ret = (long)b->shutdown;
 310         break;
 311     case BIO_CTRL_SET_CLOSE:
 312         b->shutdown = (int)num;
 313         break;
 314     case BIO_CTRL_FLUSH:
 315         st = b->flags & BIO_FLAGS_UPLINK
 316                 ? UP_fflush(b->ptr) : fflush((FILE *)b->ptr);
 317         if (st == EOF) {
 318             SYSerr(SYS_F_FFLUSH, get_last_sys_error());
 319             ERR_add_error_data(1, "fflush()");
 320             BIOerr(BIO_F_FILE_CTRL, ERR_R_SYS_LIB);
 321             ret = 0;
 322         }
 323         break;
 324     case BIO_CTRL_DUP:
 325         ret = 1;
 326         break;
 327
 328     case BIO_CTRL_WPENDING:
 329     case BIO_CTRL_PENDING:
 330     case BIO_CTRL_PUSH:
 331     case BIO_CTRL_POP:
 332     default:
 333         ret = 0;
 334         break;
 335     }
 336     return ret;
 337 }
 338
 339 static int file_gets(BIO *bp, char *buf, int size)
 340 {
 341     int ret = 0;
 342
 343     buf[0] = '\0';
 344     if (bp->flags & BIO_FLAGS_UPLINK) {
 345         if (!UP_fgets(buf, size, bp->ptr))
 346             goto err;
 347     } else {
 348         if (!fgets(buf, size, (FILE *)bp->ptr))
 349             goto err;
 350     }
 351     if (buf[0] != '\0')
 352         ret = strlen(buf);
 353  err:
 354     return ret;
 355 }
 356
 357 static int file_puts(BIO *bp, const char *str)
 358 {
 359     int n, ret;
 360
 361     n = strlen(str);
 362     ret = file_write(bp, str, n);
 363     return ret;
 364 }
 365
 366 #else
 367
 368 static int file_write(BIO *b, const char *in, int inl)
 369 {
 370     return -1;
 371 }
 372 static int file_read(BIO *b, char *out, int outl)
 373 {
 374     return -1;
 375 }
 376 static int file_puts(BIO *bp, const char *str)
 377 {
 378     return -1;
 379 }
 380 static int file_gets(BIO *bp, char *buf, int size)
 381 {
 382     return 0;
 383 }
 384 static long file_ctrl(BIO *b, int cmd, long num, void *ptr)
 385 {
 386     return 0;
 387 }
 388 static int file_new(BIO *bi)
 389 {
 390     return 0;
 391 }
 392 static int file_free(BIO *a)
 393 {
 394     return 0;
 395 }
 396
 397 static const BIO_METHOD methods_filep = {
 398     BIO_TYPE_FILE,
 399     "FILE pointer",
 400     /* TODO: Convert to new style write function */
 401     bwrite_conv,
 402     file_write,
 403     /* TODO: Convert to new style read function */
 404     bread_conv,
 405     file_read,
 406     file_puts,
 407     file_gets,
 408     file_ctrl,
 409     file_new,
 410     file_free,
 411     NULL,
 412 };
 413
 414 const BIO_METHOD *BIO_s_file(void)
 415 {
 416     return &methods_filep;
 417 }
 418
 419 BIO *BIO_new_file(const char *filename, const char *mode)
 420 {
 421     return NULL;
 422 }
 423
 424 # endif                         /* OPENSSL_NO_STDIO */
 425
 426 #endif                          /* HEADER_BSS_FILE_C */