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  * 3. 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  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)rmt.c    8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.sbin/rmt/rmt.c,v 1.7 2000/02/12 01:14:33 mjacob Exp $
  32  */
  33
  34 /*
  35  * rmt
  36  */
  37 #include <sys/types.h>
  38 #include <sys/socket.h>
  39 #include <sys/mtio.h>
  40 #include <errno.h>
  41 #include <fcntl.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 int     tape = -1;
  48
  49 char    *record;
  50 int     maxrecsize = -1;
  51
  52 #define SSIZE   64
  53 char    device[SSIZE];
  54 char    count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
  55
  56 char    resp[BUFSIZ];
  57
  58 FILE    *debug;
  59 #define DEBUG(f)        if (debug) fprintf(debug, f)
  60 #define DEBUG1(f,a)     if (debug) fprintf(debug, f, a)
  61 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
  62
  63 char    *checkbuf(char *, int);
  64 void     error(int);
  65 void     getstring(char *);
  66
  67 int
  68 main(int argc, char **argv)
  69 {
  70         int rval;
  71         char c;
  72         int n, i, cc;
  73
  74         argc--, argv++;
  75         if (argc > 0) {
  76                 debug = fopen(*argv, "w");
  77                 if (debug == NULL)
  78                         exit(1);
  79                 setbuf(debug, NULL);
  80         }
  81 top:
  82         errno = 0;
  83         rval = 0;
  84         if (read(0, &c, 1) != 1)
  85                 exit(0);
  86         switch (c) {
  87
  88         case 'O':
  89                 if (tape >= 0)
  90                         close(tape);
  91                 getstring(device);
  92                 getstring(mode);
  93                 DEBUG2("rmtd: O %s %s\n", device, mode);
  94                 /*
  95                  * XXX the rmt protocol does not provide a means to
  96                  * specify the permission bits; allow rw for everyone,
  97                  * as modified by the users umask
  98                  */
  99                 tape = open(device, atoi(mode), 0666);
 100                 if (tape < 0)
 101                         goto ioerror;
 102                 goto respond;
 103
 104         case 'C':
 105                 DEBUG("rmtd: C\n");
 106                 getstring(device);              /* discard */
 107                 if (close(tape) < 0)
 108                         goto ioerror;
 109                 tape = -1;
 110                 goto respond;
 111
 112         case 'L':
 113                 getstring(count);
 114                 getstring(pos);
 115                 DEBUG2("rmtd: L %s %s\n", count, pos);
 116                 rval = lseek(tape, (off_t)atol(count), atoi(pos));
 117                 if (rval < 0)
 118                         goto ioerror;
 119                 goto respond;
 120
 121         case 'W':
 122                 getstring(count);
 123                 n = atoi(count);
 124                 DEBUG1("rmtd: W %s\n", count);
 125                 record = checkbuf(record, n);
 126                 for (i = 0; i < n; i += cc) {
 127                         cc = read(0, &record[i], n - i);
 128                         if (cc <= 0) {
 129                                 DEBUG("rmtd: premature eof\n");
 130                                 exit(2);
 131                         }
 132                 }
 133                 rval = write(tape, record, n);
 134                 if (rval < 0)
 135                         goto ioerror;
 136                 goto respond;
 137
 138         case 'R':
 139                 getstring(count);
 140                 DEBUG1("rmtd: R %s\n", count);
 141                 n = atoi(count);
 142                 record = checkbuf(record, n);
 143                 rval = read(tape, record, n);
 144                 if (rval < 0)
 145                         goto ioerror;
 146                 sprintf(resp, "A%d\n", rval);
 147                 write(1, resp, strlen(resp));
 148                 write(1, record, rval);
 149                 goto top;
 150
 151         case 'I':
 152                 getstring(op);
 153                 getstring(count);
 154                 DEBUG2("rmtd: I %s %s\n", op, count);
 155                 { struct mtop mtop;
 156                   mtop.mt_op = atoi(op);
 157                   mtop.mt_count = atoi(count);
 158                   if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
 159                         goto ioerror;
 160                   rval = mtop.mt_count;
 161                 }
 162                 goto respond;
 163
 164         case 'S':               /* status */
 165                 DEBUG("rmtd: S\n");
 166                 { struct mtget mtget;
 167                   if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
 168                         goto ioerror;
 169                   rval = sizeof (mtget);
 170                   if (rval > 24)        /* original mtget structure size */
 171                         rval = 24;
 172                   sprintf(resp, "A%d\n", rval);
 173                   write(1, resp, strlen(resp));
 174                   write(1, (char *)&mtget, rval);
 175                   goto top;
 176                 }
 177
 178         case 'V':               /* version */
 179                 getstring(op);
 180                 DEBUG1("rmtd: V %s\n", op);
 181                 rval = 2;
 182                 goto respond;
 183
 184         default:
 185                 DEBUG1("rmtd: garbage command %c\n", c);
 186                 exit(3);
 187         }
 188 respond:
 189         DEBUG1("rmtd: A %d\n", rval);
 190         sprintf(resp, "A%d\n", rval);
 191         write(1, resp, strlen(resp));
 192         goto top;
 193 ioerror:
 194         error(errno);
 195         goto top;
 196 }
 197
 198 void
 199 getstring(char *bp)
 200 {
 201         int i;
 202         char *cp = bp;
 203
 204         for (i = 0; i < SSIZE; i++) {
 205                 if (read(0, cp+i, 1) != 1)
 206                         exit(0);
 207                 if (cp[i] == '\n')
 208                         break;
 209         }
 210         cp[i] = '\0';
 211 }
 212
 213 char *
 214 checkbuf(char *record, int size)
 215 {
 216
 217         if (size <= maxrecsize)
 218                 return (record);
 219         if (record != NULL)
 220                 free(record);
 221         record = malloc(size);
 222         if (record == NULL) {
 223                 DEBUG("rmtd: cannot allocate buffer space\n");
 224                 exit(4);
 225         }
 226         maxrecsize = size;
 227         while (size > 1024 &&
 228                setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
 229                 size -= 1024;
 230         return (record);
 231 }
 232
 233 void
 234 error(int num)
 235 {
 236
 237         DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
 238         snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
 239         write(1, resp, strlen(resp));
 240 }