usr.bin/tcopy/tcopy.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1985, 1987, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33
  34 __FBSDID("$FreeBSD$");
  35
  36 #ifndef lint
  37 static const char copyright[] =
  38 "@(#) Copyright (c) 1985, 1987, 1993\n\
  39         The Regents of the University of California.  All rights reserved.\n";
  40 #endif
  41
  42 #ifndef lint
  43 static const char sccsid[] = "@(#)tcopy.c       8.2 (Berkeley) 4/17/94";
  44 #endif
  45
  46 #include <sys/types.h>
  47 #include <sys/stat.h>
  48 #include <sys/ioctl.h>
  49 #include <sys/mtio.h>
  50
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <fcntl.h>
  54 #include <paths.h>
  55 #include <signal.h>
  56 #include <stdint.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <unistd.h>
  61
  62 #define MAXREC  (64 * 1024)
  63 #define NOCOUNT (-2)
  64
  65 static int      filen, guesslen, maxblk = MAXREC;
  66 static uint64_t lastrec, record, size, tsize;
  67 static FILE     *msg;
  68
  69 static void     *getspace(int);
  70 static void      intr(int);
  71 static void      usage(void) __dead2;
  72 static void      verify(int, int, char *);
  73 static void      writeop(int, int);
  74 static void      rewind_tape(int);
  75
  76 int
  77 main(int argc, char *argv[])
  78 {
  79         int lastnread, nread, nw, inp, outp;
  80         enum {READ, VERIFY, COPY, COPYVERIFY} op = READ;
  81         sig_t oldsig;
  82         int ch, needeof;
  83         char *buff;
  84         const char *inf;
  85
  86         msg = stdout;
  87         guesslen = 1;
  88         outp = -1;
  89         while ((ch = getopt(argc, argv, "cs:vx")) != -1)
  90                 switch((char)ch) {
  91                 case 'c':
  92                         op = COPYVERIFY;
  93                         break;
  94                 case 's':
  95                         maxblk = atoi(optarg);
  96                         if (maxblk <= 0) {
  97                                 warnx("illegal block size");
  98                                 usage();
  99                         }
 100                         guesslen = 0;
 101                         break;
 102                 case 'v':
 103                         op = VERIFY;
 104                         break;
 105                 case 'x':
 106                         msg = stderr;
 107                         break;
 108                 case '?':
 109                 default:
 110                         usage();
 111                 }
 112         argc -= optind;
 113         argv += optind;
 114
 115         switch(argc) {
 116         case 0:
 117                 if (op != READ)
 118                         usage();
 119                 inf = _PATH_DEFTAPE;
 120                 break;
 121         case 1:
 122                 if (op != READ)
 123                         usage();
 124                 inf = argv[0];
 125                 break;
 126         case 2:
 127                 if (op == READ)
 128                         op = COPY;
 129                 inf = argv[0];
 130                 if ((outp = open(argv[1], op == VERIFY ? O_RDONLY :
 131                     op == COPY ? O_WRONLY : O_RDWR, DEFFILEMODE)) < 0)
 132                         err(3, "%s", argv[1]);
 133                 break;
 134         default:
 135                 usage();
 136         }
 137
 138         if ((inp = open(inf, O_RDONLY, 0)) < 0)
 139                 err(1, "%s", inf);
 140
 141         buff = getspace(maxblk);
 142
 143         if (op == VERIFY) {
 144                 verify(inp, outp, buff);
 145                 exit(0);
 146         }
 147
 148         if ((oldsig = signal(SIGINT, SIG_IGN)) != SIG_IGN)
 149                 (void) signal(SIGINT, intr);
 150
 151         needeof = 0;
 152         for (lastnread = NOCOUNT;;) {
 153                 if ((nread = read(inp, buff, maxblk)) == -1) {
 154                         while (errno == EINVAL && (maxblk -= 1024)) {
 155                                 nread = read(inp, buff, maxblk);
 156                                 if (nread >= 0)
 157                                         goto r1;
 158                         }
 159                         err(1, "read error, file %d, record %ju", filen, (intmax_t)record);
 160                 } else if (nread != lastnread) {
 161                         if (lastnread != 0 && lastnread != NOCOUNT) {
 162                                 if (lastrec == 0 && nread == 0)
 163                                         fprintf(msg, "%ju records\n", (intmax_t)record);
 164                                 else if (record - lastrec > 1)
 165                                         fprintf(msg, "records %ju to %ju\n",
 166                                             (intmax_t)lastrec, (intmax_t)record);
 167                                 else
 168                                         fprintf(msg, "record %ju\n", (intmax_t)lastrec);
 169                         }
 170                         if (nread != 0)
 171                                 fprintf(msg, "file %d: block size %d: ",
 172                                     filen, nread);
 173                         (void) fflush(stdout);
 174                         lastrec = record;
 175                 }
 176 r1:             guesslen = 0;
 177                 if (nread > 0) {
 178                         if (op == COPY || op == COPYVERIFY) {
 179                                 if (needeof) {
 180                                         writeop(outp, MTWEOF);
 181                                         needeof = 0;
 182                                 }
 183                                 nw = write(outp, buff, nread);
 184                                 if (nw != nread) {
 185                                         if (nw == -1) {
 186                                                 warn("write error, file %d, record %ju", filen,
 187                                                     (intmax_t)record);
 188                                         } else {
 189                                                 warnx("write error, file %d, record %ju", filen,
 190                                                     (intmax_t)record);
 191                                                 warnx("write (%d) != read (%d)", nw, nread);
 192                                         }
 193                                         errx(5, "copy aborted");
 194                                 }
 195                         }
 196                         size += nread;
 197                         record++;
 198                 } else {
 199                         if (lastnread <= 0 && lastnread != NOCOUNT) {
 200                                 fprintf(msg, "eot\n");
 201                                 break;
 202                         }
 203                         fprintf(msg,
 204                             "file %d: eof after %ju records: %ju bytes\n",
 205                             filen, (intmax_t)record, (intmax_t)size);
 206                         needeof = 1;
 207                         filen++;
 208                         tsize += size;
 209                         size = record = lastrec = 0;
 210                         lastnread = 0;
 211                 }
 212                 lastnread = nread;
 213         }
 214         fprintf(msg, "total length: %ju bytes\n", (intmax_t)tsize);
 215         (void)signal(SIGINT, oldsig);
 216         if (op == COPY || op == COPYVERIFY) {
 217                 writeop(outp, MTWEOF);
 218                 writeop(outp, MTWEOF);
 219                 if (op == COPYVERIFY) {
 220                         rewind_tape(outp);
 221                         rewind_tape(inp);
 222                         verify(inp, outp, buff);
 223                 }
 224         }
 225         exit(0);
 226 }
 227
 228 static void
 229 verify(int inp, int outp, char *outb)
 230 {
 231         int eot, inmaxblk, inn, outmaxblk, outn;
 232         char *inb;
 233
 234         inb = getspace(maxblk);
 235         inmaxblk = outmaxblk = maxblk;
 236         for (eot = 0;; guesslen = 0) {
 237                 if ((inn = read(inp, inb, inmaxblk)) == -1) {
 238                         if (guesslen)
 239                                 while (errno == EINVAL && (inmaxblk -= 1024)) {
 240                                         inn = read(inp, inb, inmaxblk);
 241                                         if (inn >= 0)
 242                                                 goto r1;
 243                                 }
 244                         warn("read error");
 245                         break;
 246                 }
 247 r1:             if ((outn = read(outp, outb, outmaxblk)) == -1) {
 248                         if (guesslen)
 249                                 while (errno == EINVAL && (outmaxblk -= 1024)) {
 250                                         outn = read(outp, outb, outmaxblk);
 251                                         if (outn >= 0)
 252                                                 goto r2;
 253                                 }
 254                         warn("read error");
 255                         break;
 256                 }
 257 r2:             if (inn != outn) {
 258                         fprintf(msg,
 259                             "%s: tapes have different block sizes; %d != %d.\n",
 260                             "tcopy", inn, outn);
 261                         break;
 262                 }
 263                 if (!inn) {
 264                         if (eot++) {
 265                                 fprintf(msg, "tcopy: tapes are identical.\n");
 266                                 free(inb);
 267                                 return;
 268                         }
 269                 } else {
 270                         if (bcmp(inb, outb, inn)) {
 271                                 fprintf(msg,
 272                                     "tcopy: tapes have different data.\n");
 273                                 break;
 274                         }
 275                         eot = 0;
 276                 }
 277         }
 278         exit(1);
 279 }
 280
 281 static void
 282 intr(int signo __unused)
 283 {
 284         if (record) {
 285                 if (record - lastrec > 1)
 286                         fprintf(msg, "records %ju to %ju\n", (intmax_t)lastrec, (intmax_t)record);
 287                 else
 288                         fprintf(msg, "record %ju\n", (intmax_t)lastrec);
 289         }
 290         fprintf(msg, "interrupt at file %d: record %ju\n", filen, (intmax_t)record);
 291         fprintf(msg, "total length: %ju bytes\n", (uintmax_t)(tsize + size));
 292         exit(1);
 293 }
 294
 295 static void *
 296 getspace(int blk)
 297 {
 298         void *bp;
 299
 300         if ((bp = malloc((size_t)blk)) == NULL)
 301                 errx(11, "no memory");
 302         return (bp);
 303 }
 304
 305 static void
 306 writeop(int fd, int type)
 307 {
 308         struct mtop op;
 309
 310         op.mt_op = type;
 311         op.mt_count = (daddr_t)1;
 312         if (ioctl(fd, MTIOCTOP, (char *)&op) < 0)
 313                 err(6, "tape op");
 314 }
 315
 316 static void
 317 usage(void)
 318 {
 319         fprintf(stderr, "usage: tcopy [-cvx] [-s maxblk] [src [dest]]\n");
 320         exit(1);
 321 }
 322
 323 static void
 324 rewind_tape(int fd)
 325 {
 326         struct stat sp;
 327
 328         if(fstat(fd, &sp))
 329                 errx(12, "fstat in rewind");
 330
 331         /*
 332          * don't want to do tape ioctl on regular files:
 333          */
 334         if( S_ISREG(sp.st_mode) ) {
 335                 if( lseek(fd, 0, SEEK_SET) == -1 )
 336                         errx(13, "lseek");
 337         } else
 338                 /*  assume its a tape   */
 339                 writeop(fd, MTREW);
 340 }