usr.sbin/rmt/rmt.c

   1 /*      $NetBSD: rmt.c,v 1.15 2008/07/21 13:36:59 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. 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 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)rmt.c       8.1 (Berkeley) 6/6/93";
  41 #else
  42 __RCSID("$NetBSD: rmt.c,v 1.15 2008/07/21 13:36:59 lukem Exp $");
  43 #endif
  44 #endif /* not lint */
  45
  46 /*
  47  * rmt
  48  */
  49 #include <sys/types.h>
  50 #include <sys/ioctl.h>
  51 #include <sys/mtio.h>
  52 #include <sys/socket.h>
  53 #include <sys/stat.h>
  54
  55 #include <errno.h>
  56 #include <fcntl.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <unistd.h>
  61
  62 int     tape = -1;
  63
  64 int     maxrecsize = -1;
  65
  66 #define SSIZE   64
  67 char    device[SSIZE];
  68 char    count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE];
  69
  70 char    resp[BUFSIZ];
  71
  72 FILE    *debug;
  73 #define DEBUG(f)        if (debug) fprintf(debug, f)
  74 #define DEBUG1(f,a)     if (debug) fprintf(debug, f, a)
  75 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2)
  76
  77 char    *checkbuf __P((char *, int));
  78 void     error __P((int));
  79 int      main __P((int, char **));
  80 void     getstring __P((char *, size_t));
  81
  82 int
  83 main(argc, argv)
  84         int argc;
  85         char **argv;
  86 {
  87         char *record = NULL;
  88         int rval;
  89         char c;
  90         int n, i, cc;
  91
  92         argc--, argv++;
  93         if (argc > 0) {
  94                 debug = fopen(*argv, "w");
  95                 if (debug == 0)
  96                         exit(1);
  97                 (void)setbuf(debug, (char *)0);
  98         }
  99 top:
 100         errno = 0;
 101         rval = 0;
 102         if (read(STDIN_FILENO, &c, 1) != 1)
 103                 exit(0);
 104         switch (c) {
 105
 106         case 'O':
 107                 if (tape >= 0)
 108                         (void) close(tape);
 109                 getstring(device, sizeof(device));
 110                 getstring(mode, sizeof(mode));
 111                 DEBUG2("rmtd: O %s %s\n", device, mode);
 112                 tape = open(device, atoi(mode),
 113                     S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
 114                 if (tape < 0)
 115                         goto ioerror;
 116                 goto respond;
 117
 118         case 'C':
 119                 DEBUG("rmtd: C\n");
 120                 getstring(device, sizeof(device));      /* discard */
 121                 if (close(tape) < 0)
 122                         goto ioerror;
 123                 tape = -1;
 124                 goto respond;
 125
 126         case 'L':
 127                 getstring(count, sizeof(count));
 128                 getstring(pos, sizeof(pos));
 129                 DEBUG2("rmtd: L %s %s\n", count, pos);
 130                 rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos));
 131                 if (rval < 0)
 132                         goto ioerror;
 133                 goto respond;
 134
 135         case 'W':
 136                 getstring(count, sizeof(count));
 137                 n = atoi(count);
 138                 DEBUG1("rmtd: W %s\n", count);
 139                 record = checkbuf(record, n);
 140                 for (i = 0; i < n; i += cc) {
 141                         cc = read(STDIN_FILENO, &record[i], n - i);
 142                         if (cc <= 0) {
 143                                 DEBUG("rmtd: premature eof\n");
 144                                 exit(2);
 145                         }
 146                 }
 147                 rval = write(tape, record, n);
 148                 if (rval < 0)
 149                         goto ioerror;
 150                 goto respond;
 151
 152         case 'R':
 153                 getstring(count, sizeof(count));
 154                 DEBUG1("rmtd: R %s\n", count);
 155                 n = atoi(count);
 156                 record = checkbuf(record, n);
 157                 rval = read(tape, record, n);
 158                 if (rval < 0)
 159                         goto ioerror;
 160                 (void)snprintf(resp, sizeof(resp), "A%d\n", rval);
 161                 (void)write(STDOUT_FILENO, resp, strlen(resp));
 162                 (void)write(STDOUT_FILENO, record, rval);
 163                 goto top;
 164
 165         case 'I':
 166                 getstring(op, sizeof(op));
 167                 getstring(count, sizeof(count));
 168                 DEBUG2("rmtd: I %s %s\n", op, count);
 169                 {
 170                         struct mtop mtop;
 171
 172                         mtop.mt_op = atoi(op);
 173                         mtop.mt_count = atoi(count);
 174                         if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0)
 175                                 goto ioerror;
 176                         rval = mtop.mt_count;
 177                 }
 178                 goto respond;
 179
 180         case 'S':               /* status */
 181                 DEBUG("rmtd: S\n");
 182                 {
 183                         struct mtget mtget;
 184
 185                         if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0)
 186                                 goto ioerror;
 187                         rval = sizeof (mtget);
 188                         /* limit size to 'original' mtget size */
 189                         if (rval > 24)
 190                                 rval = 24;
 191                         (void)snprintf(resp, sizeof(resp), "A%d\n", rval);
 192                         (void)write(STDOUT_FILENO, resp, strlen(resp));
 193                         (void)write(STDOUT_FILENO, (char *)&mtget, rval);
 194                         goto top;
 195                 }
 196
 197         default:
 198                 DEBUG1("rmtd: garbage command %c\n", c);
 199                 exit(3);
 200         }
 201 respond:
 202         DEBUG1("rmtd: A %d\n", rval);
 203         (void)snprintf(resp, sizeof(resp), "A%d\n", rval);
 204         (void)write(STDOUT_FILENO, resp, strlen(resp));
 205         goto top;
 206 ioerror:
 207         error(errno);
 208         goto top;
 209 }
 210
 211 void
 212 getstring(bp, size)
 213         char *bp;
 214         size_t size;
 215 {
 216         char *cp = bp;
 217         char *ep = bp + size - 1;
 218
 219         do {
 220                 if (read(STDIN_FILENO, cp, 1) != 1)
 221                         exit(0);
 222         } while (*cp != '\n' && ++cp < ep);
 223         *cp = '\0';
 224 }
 225
 226 char *
 227 checkbuf(record, size)
 228         char *record;
 229         int size;
 230 {
 231
 232         if (size <= maxrecsize)
 233                 return (record);
 234         if (record != 0)
 235                 free(record);
 236         record = malloc(size);
 237         if (record == 0) {
 238                 DEBUG("rmtd: cannot allocate buffer space\n");
 239                 exit(4);
 240         }
 241         maxrecsize = size;
 242         while (size > 1024 &&
 243             setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0)
 244                 size -= 1024;
 245         return (record);
 246 }
 247
 248 void
 249 error(num)
 250         int num;
 251 {
 252
 253         DEBUG2("rmtd: E %d (%s)\n", num, strerror(num));
 254         (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num));
 255         (void)write(STDOUT_FILENO, resp, strlen(resp));
 256 }