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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)rmt.c    8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.sbin/rmt/rmt.c,v 1.7 2000/02/12 01:14:33 mjacob Exp $
  36  * $DragonFly: src/usr.sbin/rmt/rmt.c,v 1.5 2005/12/05 02:40:28 swildner Exp $
  37  */
  38
  39 /*
  40  * rmt
  41  */
  42 #include <sys/types.h>
  43 #include <sys/socket.h>
  44 #include <sys/mtio.h>
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <sgtty.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 int     tape = -1;
  54
  55 char    *record;
  56 int     maxrecsize = -1;
  57
  58 #define SSIZE   64
  59 char    device[SSIZE];
  60 char    count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
  61
  62 char    resp[BUFSIZ];
  63
  64 FILE    *debug;
  65 #define DEBUG(f)        if (debug) fprintf(debug, f)
  66 #define DEBUG1(f,a)     if (debug) fprintf(debug, f, a)
  67 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
  68
  69 char    *checkbuf(char *, int);
  70 void     error(int);
  71 void     getstring(char *);
  72
  73 int
  74 main(int argc, char **argv)
  75 {
  76         int rval;
  77         char c;
  78         int n, i, cc;
  79
  80         argc--, argv++;
  81         if (argc > 0) {
  82                 debug = fopen(*argv, "w");
  83                 if (debug == 0)
  84                         exit(1);
  85                 setbuf(debug, NULL);
  86         }
  87 top:
  88         errno = 0;
  89         rval = 0;
  90         if (read(0, &c, 1) != 1)
  91                 exit(0);
  92         switch (c) {
  93
  94         case 'O':
  95                 if (tape >= 0)
  96                         close(tape);
  97                 getstring(device);
  98                 getstring(mode);
  99                 DEBUG2("rmtd: O %s %s\n", device, mode);
 100                 /*
 101                  * XXX the rmt protocol does not provide a means to
 102                  * specify the permission bits; allow rw for everyone,
 103                  * as modified by the users umask
 104                  */
 105                 tape = open(device, atoi(mode), 0666);
 106                 if (tape < 0)
 107                         goto ioerror;
 108                 goto respond;
 109
 110         case 'C':
 111                 DEBUG("rmtd: C\n");
 112                 getstring(device);              /* discard */
 113                 if (close(tape) < 0)
 114                         goto ioerror;
 115                 tape = -1;
 116                 goto respond;
 117
 118         case 'L':
 119                 getstring(count);
 120                 getstring(pos);
 121                 DEBUG2("rmtd: L %s %s\n", count, pos);
 122                 rval = lseek(tape, (off_t)atol(count), atoi(pos));
 123                 if (rval < 0)
 124                         goto ioerror;
 125                 goto respond;
 126
 127         case 'W':
 128                 getstring(count);
 129                 n = atoi(count);
 130                 DEBUG1("rmtd: W %s\n", count);
 131                 record = checkbuf(record, n);
 132                 for (i = 0; i < n; i += cc) {
 133                         cc = read(0, &record[i], n - i);
 134                         if (cc <= 0) {
 135                                 DEBUG("rmtd: premature eof\n");
 136                                 exit(2);
 137                         }
 138                 }
 139                 rval = write(tape, record, n);
 140                 if (rval < 0)
 141                         goto ioerror;
 142                 goto respond;
 143
 144         case 'R':
 145                 getstring(count);
 146                 DEBUG1("rmtd: R %s\n", count);
 147                 n = atoi(count);
 148                 record = checkbuf(record, n);
 149                 rval = read(tape, record, n);
 150                 if (rval < 0)
 151                         goto ioerror;
 152                 sprintf(resp, "A%d\n", rval);
 153                 write(1, resp, strlen(resp));
 154                 write(1, record, rval);
 155                 goto top;
 156
 157         case 'I':
 158                 getstring(op);
 159                 getstring(count);
 160                 DEBUG2("rmtd: I %s %s\n", op, count);
 161                 { struct mtop mtop;
 162                   mtop.mt_op = atoi(op);
 163                   mtop.mt_count = atoi(count);
 164                   if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
 165                         goto ioerror;
 166                   rval = mtop.mt_count;
 167                 }
 168                 goto respond;
 169
 170         case 'S':               /* status */
 171                 DEBUG("rmtd: S\n");
 172                 { struct mtget mtget;
 173                   if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
 174                         goto ioerror;
 175                   rval = sizeof (mtget);
 176                   if (rval > 24)        /* original mtget structure size */
 177                         rval = 24;
 178                   sprintf(resp, "A%d\n", rval);
 179                   write(1, resp, strlen(resp));
 180                   write(1, (char *)&mtget, rval);
 181                   goto top;
 182                 }
 183
 184         case 'V':               /* version */
 185                 getstring(op);
 186                 DEBUG1("rmtd: V %s\n", op);
 187                 rval = 2;
 188                 goto respond;
 189
 190         default:
 191                 DEBUG1("rmtd: garbage command %c\n", c);
 192                 exit(3);
 193         }
 194 respond:
 195         DEBUG1("rmtd: A %d\n", rval);
 196         sprintf(resp, "A%d\n", rval);
 197         write(1, resp, strlen(resp));
 198         goto top;
 199 ioerror:
 200         error(errno);
 201         goto top;
 202 }
 203
 204 void
 205 getstring(char *bp)
 206 {
 207         int i;
 208         char *cp = bp;
 209
 210         for (i = 0; i < SSIZE; i++) {
 211                 if (read(0, cp+i, 1) != 1)
 212                         exit(0);
 213                 if (cp[i] == '\n')
 214                         break;
 215         }
 216         cp[i] = '\0';
 217 }
 218
 219 char *
 220 checkbuf(char *record, int size)
 221 {
 222
 223         if (size <= maxrecsize)
 224                 return (record);
 225         if (record != 0)
 226                 free(record);
 227         record = malloc(size);
 228         if (record == 0) {
 229                 DEBUG("rmtd: cannot allocate buffer space\n");
 230                 exit(4);
 231         }
 232         maxrecsize = size;
 233         while (size > 1024 &&
 234                setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
 235                 size -= 1024;
 236         return (record);
 237 }
 238
 239 void
 240 error(int num)
 241 {
 242
 243         DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
 244         snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
 245         write(1, resp, strlen(resp));
 246 }