usr.sbin/rmt/rmt.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if 0
  31 #ifndef lint
  32 static const char copyright[] =
  33 "@(#) Copyright (c) 1983, 1993\n\
  34         The Regents of the University of California.  All rights reserved.\n";
  35 #endif /* not lint */
  36
  37 #ifndef lint
  38 static char sccsid[] = "@(#)rmt.c       8.1 (Berkeley) 6/6/93";
  39 #endif /* not lint */
  40 #endif
  41 #include <sys/cdefs.h>
  42 __FBSDID("$FreeBSD$");
  43
  44 /*
  45  * rmt
  46  */
  47 #include <sys/types.h>
  48 #include <sys/socket.h>
  49 #include <sys/mtio.h>
  50 #include <errno.h>
  51 #include <fcntl.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <unistd.h>
  56
  57 int     tape = -1;
  58
  59 char    *record;
  60 int     maxrecsize = -1;
  61
  62 #define SSIZE   64
  63 char    device[SSIZE];
  64 char    count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
  65
  66 char    resp[BUFSIZ];
  67
  68 FILE    *debug;
  69 #define DEBUG(f)        if (debug) fprintf(debug, f)
  70 #define DEBUG1(f,a)     if (debug) fprintf(debug, f, a)
  71 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
  72
  73 char    *checkbuf(char *, int);
  74 void     error(int);
  75 void     getstring(char *);
  76
  77 int
  78 main(int argc, char **argv)
  79 {
  80         int rval;
  81         char c;
  82         int n, i, cc;
  83
  84         argc--, argv++;
  85         if (argc > 0) {
  86                 debug = fopen(*argv, "w");
  87                 if (debug == 0)
  88                         exit(1);
  89                 (void)setbuf(debug, (char *)0);
  90         }
  91 top:
  92         errno = 0;
  93         rval = 0;
  94         if (read(STDIN_FILENO, &c, 1) != 1)
  95                 exit(0);
  96         switch (c) {
  97
  98         case 'O':
  99                 if (tape >= 0)
 100                         (void) close(tape);
 101                 getstring(device);
 102                 getstring(mode);
 103                 DEBUG2("rmtd: O %s %s\n", device, mode);
 104                 /*
 105                  * XXX the rmt protocol does not provide a means to
 106                  * specify the permission bits; allow rw for everyone,
 107                  * as modified by the users umask
 108                  */
 109                 tape = open(device, atoi(mode), 0666);
 110                 if (tape < 0)
 111                         goto ioerror;
 112                 goto respond;
 113
 114         case 'C':
 115                 DEBUG("rmtd: C\n");
 116                 getstring(device);              /* discard */
 117                 if (close(tape) < 0)
 118                         goto ioerror;
 119                 tape = -1;
 120                 goto respond;
 121
 122         case 'L':
 123                 getstring(count);
 124                 getstring(pos);
 125                 DEBUG2("rmtd: L %s %s\n", count, pos);
 126                 rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos));
 127                 if (rval < 0)
 128                         goto ioerror;
 129                 goto respond;
 130
 131         case 'W':
 132                 getstring(count);
 133                 n = atoi(count);
 134                 DEBUG1("rmtd: W %s\n", count);
 135                 record = checkbuf(record, n);
 136                 for (i = 0; i < n; i += cc) {
 137                         cc = read(STDIN_FILENO, &record[i], n - i);
 138                         if (cc <= 0) {
 139                                 DEBUG("rmtd: premature eof\n");
 140                                 exit(2);
 141                         }
 142                 }
 143                 rval = write(tape, record, n);
 144                 if (rval < 0)
 145                         goto ioerror;
 146                 goto respond;
 147
 148         case 'R':
 149                 getstring(count);
 150                 DEBUG1("rmtd: R %s\n", count);
 151                 n = atoi(count);
 152                 record = checkbuf(record, n);
 153                 rval = read(tape, record, n);
 154                 if (rval < 0)
 155                         goto ioerror;
 156                 (void)sprintf(resp, "A%d\n", rval);
 157                 (void)write(STDOUT_FILENO, resp, strlen(resp));
 158                 (void)write(STDOUT_FILENO, record, rval);
 159                 goto top;
 160
 161         case 'I':
 162                 getstring(op);
 163                 getstring(count);
 164                 DEBUG2("rmtd: I %s %s\n", op, count);
 165                 { struct mtop mtop;
 166                   mtop.mt_op = atoi(op);
 167                   mtop.mt_count = atoi(count);
 168                   if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
 169                         goto ioerror;
 170                   rval = mtop.mt_count;
 171                 }
 172                 goto respond;
 173
 174         case 'S':               /* status */
 175                 DEBUG("rmtd: S\n");
 176                 { struct mtget mtget;
 177                   if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
 178                         goto ioerror;
 179                   rval = sizeof (mtget);
 180                   if (rval > 24)        /* original mtget structure size */
 181                         rval = 24;
 182                   (void)sprintf(resp, "A%d\n", rval);
 183                   (void)write(STDOUT_FILENO, resp, strlen(resp));
 184                   (void)write(STDOUT_FILENO, (char *)&mtget, rval);
 185                   goto top;
 186                 }
 187
 188         case 'V':               /* version */
 189                 getstring(op);
 190                 DEBUG1("rmtd: V %s\n", op);
 191                 rval = 2;
 192                 goto respond;
 193
 194         default:
 195                 DEBUG1("rmtd: garbage command %c\n", c);
 196                 exit(3);
 197         }
 198 respond:
 199         DEBUG1("rmtd: A %d\n", rval);
 200         (void)sprintf(resp, "A%d\n", rval);
 201         (void)write(STDOUT_FILENO, resp, strlen(resp));
 202         goto top;
 203 ioerror:
 204         error(errno);
 205         goto top;
 206 }
 207
 208 void
 209 getstring(bp)
 210         char *bp;
 211 {
 212         int i;
 213         char *cp = bp;
 214
 215         for (i = 0; i < SSIZE; i++) {
 216                 if (read(STDIN_FILENO, cp+i, 1) != 1)
 217                         exit(0);
 218                 if (cp[i] == '\n')
 219                         break;
 220         }
 221         cp[i] = '\0';
 222 }
 223
 224 char *
 225 checkbuf(rec, size)
 226         char *rec;
 227         int size;
 228 {
 229
 230         if (size <= maxrecsize)
 231                 return (rec);
 232         if (rec != 0)
 233                 free(rec);
 234         rec = malloc(size);
 235         if (rec == 0) {
 236                 DEBUG("rmtd: cannot allocate buffer space\n");
 237                 exit(4);
 238         }
 239         maxrecsize = size;
 240         while (size > 1024 &&
 241                setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
 242                 size -= 1024;
 243         return (rec);
 244 }
 245
 246 void
 247 error(num)
 248         int num;
 249 {
 250
 251         DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
 252         (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
 253         (void)write(STDOUT_FILENO, resp, strlen(resp));
 254 }