rmt/rmt.c

   1 /*      $NetBSD: rmt.c,v 1.9 1997/10/17 13:03:25 lukem Exp $    */
   2
   3 /*
   4  * Copyright (c) 1983, 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. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
  39         The Regents of the University of California.  All rights reserved.\n");
  40 #endif /* not lint */
  41
  42 #ifndef lint
  43 #if 0
  44 static char sccsid[] = "@(#)rmt.c       8.1 (Berkeley) 6/6/93";
  45 #else
  46 __RCSID("$NetBSD: rmt.c,v 1.9 1997/10/17 13:03:25 lukem Exp $");
  47 #endif
  48 #endif /* not lint */
  49
  50 /*
  51  * rmt
  52  */
  53 #include <sys/types.h>
  54 #include <sys/ioctl.h>
  55 #include <sys/mtio.h>
  56 #include <sys/socket.h>
  57 #include <sys/stat.h>
  58
  59 #include <errno.h>
  60 #include <fcntl.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65
  66 int     tape = -1;
  67
  68 char    *record;
  69 int     maxrecsize = -1;
  70
  71 #define SSIZE   64
  72 char    device[SSIZE];
  73 char    count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
  74
  75 char    resp[BUFSIZ];
  76
  77 FILE    *debug;
  78 #define DEBUG(f)        if (debug) fprintf(debug, f)
  79 #define DEBUG1(f,a)     if (debug) fprintf(debug, f, a)
  80 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
  81
  82 char    *checkbuf __P((char *, int));
  83 void     error __P((int));
  84 int      main __P((int, char **));
  85 void     getstring __P((char *));
  86
  87 int
  88 main(argc, argv)
  89         int argc;
  90         char **argv;
  91 {
  92         int rval;
  93         char c;
  94         int n, i, cc;
  95
  96         argc--, argv++;
  97         if (argc > 0) {
  98                 debug = fopen(*argv, "w");
  99                 if (debug == 0)
 100                         exit(1);
 101                 (void)setbuf(debug, (char *)0);
 102         }
 103 top:
 104         errno = 0;
 105         rval = 0;
 106         if (read(STDIN_FILENO, &c, 1) != 1)
 107                 exit(0);
 108         switch (c) {
 109
 110         case 'O':
 111                 if (tape >= 0)
 112                         (void) close(tape);
 113                 getstring(device);
 114                 getstring(mode);
 115                 DEBUG2("rmtd: O %s %s\n", device, mode);
 116                 tape = open(device, atoi(mode),
 117                     S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
 118                 if (tape < 0)
 119                         goto ioerror;
 120                 goto respond;
 121
 122         case 'C':
 123                 DEBUG("rmtd: C\n");
 124                 getstring(device);              /* discard */
 125                 if (close(tape) < 0)
 126                         goto ioerror;
 127                 tape = -1;
 128                 goto respond;
 129
 130         case 'L':
 131                 getstring(count);
 132                 getstring(pos);
 133                 DEBUG2("rmtd: L %s %s\n", count, pos);
 134                 rval = lseek(tape, (off_t)strtoq(count, NULL, 10), atoi(pos));
 135                 if (rval < 0)
 136                         goto ioerror;
 137                 goto respond;
 138
 139         case 'W':
 140                 getstring(count);
 141                 n = atoi(count);
 142                 DEBUG1("rmtd: W %s\n", count);
 143                 record = checkbuf(record, n);
 144                 for (i = 0; i < n; i += cc) {
 145                         cc = read(STDIN_FILENO, &record[i], n - i);
 146                         if (cc <= 0) {
 147                                 DEBUG("rmtd: premature eof\n");
 148                                 exit(2);
 149                         }
 150                 }
 151                 rval = write(tape, record, n);
 152                 if (rval < 0)
 153                         goto ioerror;
 154                 goto respond;
 155
 156         case 'R':
 157                 getstring(count);
 158                 DEBUG1("rmtd: R %s\n", count);
 159                 n = atoi(count);
 160                 record = checkbuf(record, n);
 161                 rval = read(tape, record, n);
 162                 if (rval < 0)
 163                         goto ioerror;
 164                 (void)sprintf(resp, "A%d\n", rval);
 165                 (void)write(STDOUT_FILENO, resp, strlen(resp));
 166                 (void)write(STDOUT_FILENO, record, rval);
 167                 goto top;
 168
 169         case 'I':
 170                 getstring(op);
 171                 getstring(count);
 172                 DEBUG2("rmtd: I %s %s\n", op, count);
 173                 {
 174                         struct mtop mtop;
 175
 176                         mtop.mt_op = atoi(op);
 177                         mtop.mt_count = atoi(count);
 178                         if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
 179                                 goto ioerror;
 180                         rval = mtop.mt_count;
 181                 }
 182                 goto respond;
 183
 184         case 'S':               /* status */
 185                 DEBUG("rmtd: S\n");
 186                 {
 187                         struct mtget mtget;
 188
 189                         if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
 190                                 goto ioerror;
 191                         rval = sizeof (mtget);
 192                         (void)sprintf(resp, "A%d\n", rval);
 193                         (void)write(STDOUT_FILENO, resp, strlen(resp));
 194                         (void)write(STDOUT_FILENO, (char *)&mtget,
 195                             sizeof (mtget));
 196                         goto top;
 197                 }
 198
 199         default:
 200                 DEBUG1("rmtd: garbage command %c\n", c);
 201                 exit(3);
 202         }
 203 respond:
 204         DEBUG1("rmtd: A %d\n", rval);
 205         (void)sprintf(resp, "A%d\n", rval);
 206         (void)write(STDOUT_FILENO, resp, strlen(resp));
 207         goto top;
 208 ioerror:
 209         error(errno);
 210         goto top;
 211 }
 212
 213 void
 214 getstring(bp)
 215         char *bp;
 216 {
 217         int i;
 218         char *cp = bp;
 219
 220         for (i = 0; i < SSIZE - 1; i++) {
 221                 if (read(STDIN_FILENO, cp+i, 1) != 1)
 222                         exit(0);
 223                 if (cp[i] == '\n')
 224                         break;
 225         }
 226         cp[i] = '\0';
 227 }
 228
 229 char *
 230 checkbuf(record, size)
 231         char *record;
 232         int size;
 233 {
 234
 235         if (size <= maxrecsize)
 236                 return (record);
 237         if (record != 0)
 238                 free(record);
 239         record = malloc(size);
 240         if (record == 0) {
 241                 DEBUG("rmtd: cannot allocate buffer space\n");
 242                 exit(4);
 243         }
 244         maxrecsize = size;
 245         while (size > 1024 &&
 246             setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
 247                 size -= 1024;
 248         return (record);
 249 }
 250
 251 void
 252 error(num)
 253         int num;
 254 {
 255
 256         DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
 257         (void)sprintf(resp, "E%d\n%s\n", num, strerror(num));
 258         (void)write(STDOUT_FILENO, resp, strlen(resp));
 259 }