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 } 241