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 */ 37 38 /* 39 * rmt 40 */ 41 #include <sys/types.h> 42 #include <sys/socket.h> 43 #include <sys/mtio.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <sgtty.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 52 int tape = -1; 53 54 char *record; 55 int maxrecsize = -1; 56 57 #define SSIZE 64 58 char device[SSIZE]; 59 char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE]; 60 61 char resp[BUFSIZ]; 62 63 FILE *debug; 64 #define DEBUG(f) if (debug) fprintf(debug, f) 65 #define DEBUG1(f,a) if (debug) fprintf(debug, f, a) 66 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) 67 68 char *checkbuf(char *, int); 69 void error(int); 70 void getstring(char *); 71 72 int 73 main(int argc, char **argv) 74 { 75 int rval; 76 char c; 77 int n, i, cc; 78 79 argc--, argv++; 80 if (argc > 0) { 81 debug = fopen(*argv, "w"); 82 if (debug == NULL) 83 exit(1); 84 setbuf(debug, NULL); 85 } 86 top: 87 errno = 0; 88 rval = 0; 89 if (read(0, &c, 1) != 1) 90 exit(0); 91 switch (c) { 92 93 case 'O': 94 if (tape >= 0) 95 close(tape); 96 getstring(device); 97 getstring(mode); 98 DEBUG2("rmtd: O %s %s\n", device, mode); 99 /* 100 * XXX the rmt protocol does not provide a means to 101 * specify the permission bits; allow rw for everyone, 102 * as modified by the users umask 103 */ 104 tape = open(device, atoi(mode), 0666); 105 if (tape < 0) 106 goto ioerror; 107 goto respond; 108 109 case 'C': 110 DEBUG("rmtd: C\n"); 111 getstring(device); /* discard */ 112 if (close(tape) < 0) 113 goto ioerror; 114 tape = -1; 115 goto respond; 116 117 case 'L': 118 getstring(count); 119 getstring(pos); 120 DEBUG2("rmtd: L %s %s\n", count, pos); 121 rval = lseek(tape, (off_t)atol(count), atoi(pos)); 122 if (rval < 0) 123 goto ioerror; 124 goto respond; 125 126 case 'W': 127 getstring(count); 128 n = atoi(count); 129 DEBUG1("rmtd: W %s\n", count); 130 record = checkbuf(record, n); 131 for (i = 0; i < n; i += cc) { 132 cc = read(0, &record[i], n - i); 133 if (cc <= 0) { 134 DEBUG("rmtd: premature eof\n"); 135 exit(2); 136 } 137 } 138 rval = write(tape, record, n); 139 if (rval < 0) 140 goto ioerror; 141 goto respond; 142 143 case 'R': 144 getstring(count); 145 DEBUG1("rmtd: R %s\n", count); 146 n = atoi(count); 147 record = checkbuf(record, n); 148 rval = read(tape, record, n); 149 if (rval < 0) 150 goto ioerror; 151 sprintf(resp, "A%d\n", rval); 152 write(1, resp, strlen(resp)); 153 write(1, record, rval); 154 goto top; 155 156 case 'I': 157 getstring(op); 158 getstring(count); 159 DEBUG2("rmtd: I %s %s\n", op, count); 160 { struct mtop mtop; 161 mtop.mt_op = atoi(op); 162 mtop.mt_count = atoi(count); 163 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 164 goto ioerror; 165 rval = mtop.mt_count; 166 } 167 goto respond; 168 169 case 'S': /* status */ 170 DEBUG("rmtd: S\n"); 171 { struct mtget mtget; 172 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 173 goto ioerror; 174 rval = sizeof (mtget); 175 if (rval > 24) /* original mtget structure size */ 176 rval = 24; 177 sprintf(resp, "A%d\n", rval); 178 write(1, resp, strlen(resp)); 179 write(1, (char *)&mtget, rval); 180 goto top; 181 } 182 183 case 'V': /* version */ 184 getstring(op); 185 DEBUG1("rmtd: V %s\n", op); 186 rval = 2; 187 goto respond; 188 189 default: 190 DEBUG1("rmtd: garbage command %c\n", c); 191 exit(3); 192 } 193 respond: 194 DEBUG1("rmtd: A %d\n", rval); 195 sprintf(resp, "A%d\n", rval); 196 write(1, resp, strlen(resp)); 197 goto top; 198 ioerror: 199 error(errno); 200 goto top; 201 } 202 203 void 204 getstring(char *bp) 205 { 206 int i; 207 char *cp = bp; 208 209 for (i = 0; i < SSIZE; i++) { 210 if (read(0, cp+i, 1) != 1) 211 exit(0); 212 if (cp[i] == '\n') 213 break; 214 } 215 cp[i] = '\0'; 216 } 217 218 char * 219 checkbuf(char *record, int size) 220 { 221 222 if (size <= maxrecsize) 223 return (record); 224 if (record != NULL) 225 free(record); 226 record = malloc(size); 227 if (record == NULL) { 228 DEBUG("rmtd: cannot allocate buffer space\n"); 229 exit(4); 230 } 231 maxrecsize = size; 232 while (size > 1024 && 233 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 234 size -= 1024; 235 return (record); 236 } 237 238 void 239 error(int num) 240 { 241 242 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 243 snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num)); 244 write(1, resp, strlen(resp)); 245 } 246