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 1.4 2004/12/18 22:48:05 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(argc, argv) 75 int argc; 76 char **argv; 77 { 78 int rval; 79 char c; 80 int n, i, cc; 81 82 argc--, argv++; 83 if (argc > 0) { 84 debug = fopen(*argv, "w"); 85 if (debug == 0) 86 exit(1); 87 setbuf(debug, (char *)0); 88 } 89 top: 90 errno = 0; 91 rval = 0; 92 if (read(0, &c, 1) != 1) 93 exit(0); 94 switch (c) { 95 96 case 'O': 97 if (tape >= 0) 98 close(tape); 99 getstring(device); 100 getstring(mode); 101 DEBUG2("rmtd: O %s %s\n", device, mode); 102 /* 103 * XXX the rmt protocol does not provide a means to 104 * specify the permission bits; allow rw for everyone, 105 * as modified by the users umask 106 */ 107 tape = open(device, atoi(mode), 0666); 108 if (tape < 0) 109 goto ioerror; 110 goto respond; 111 112 case 'C': 113 DEBUG("rmtd: C\n"); 114 getstring(device); /* discard */ 115 if (close(tape) < 0) 116 goto ioerror; 117 tape = -1; 118 goto respond; 119 120 case 'L': 121 getstring(count); 122 getstring(pos); 123 DEBUG2("rmtd: L %s %s\n", count, pos); 124 rval = lseek(tape, (off_t)atol(count), atoi(pos)); 125 if (rval < 0) 126 goto ioerror; 127 goto respond; 128 129 case 'W': 130 getstring(count); 131 n = atoi(count); 132 DEBUG1("rmtd: W %s\n", count); 133 record = checkbuf(record, n); 134 for (i = 0; i < n; i += cc) { 135 cc = read(0, &record[i], n - i); 136 if (cc <= 0) { 137 DEBUG("rmtd: premature eof\n"); 138 exit(2); 139 } 140 } 141 rval = write(tape, record, n); 142 if (rval < 0) 143 goto ioerror; 144 goto respond; 145 146 case 'R': 147 getstring(count); 148 DEBUG1("rmtd: R %s\n", count); 149 n = atoi(count); 150 record = checkbuf(record, n); 151 rval = read(tape, record, n); 152 if (rval < 0) 153 goto ioerror; 154 sprintf(resp, "A%d\n", rval); 155 write(1, resp, strlen(resp)); 156 write(1, record, rval); 157 goto top; 158 159 case 'I': 160 getstring(op); 161 getstring(count); 162 DEBUG2("rmtd: I %s %s\n", op, count); 163 { struct mtop mtop; 164 mtop.mt_op = atoi(op); 165 mtop.mt_count = atoi(count); 166 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 167 goto ioerror; 168 rval = mtop.mt_count; 169 } 170 goto respond; 171 172 case 'S': /* status */ 173 DEBUG("rmtd: S\n"); 174 { struct mtget mtget; 175 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 176 goto ioerror; 177 rval = sizeof (mtget); 178 if (rval > 24) /* original mtget structure size */ 179 rval = 24; 180 sprintf(resp, "A%d\n", rval); 181 write(1, resp, strlen(resp)); 182 write(1, (char *)&mtget, rval); 183 goto top; 184 } 185 186 case 'V': /* version */ 187 getstring(op); 188 DEBUG1("rmtd: V %s\n", op); 189 rval = 2; 190 goto respond; 191 192 default: 193 DEBUG1("rmtd: garbage command %c\n", c); 194 exit(3); 195 } 196 respond: 197 DEBUG1("rmtd: A %d\n", rval); 198 sprintf(resp, "A%d\n", rval); 199 write(1, resp, strlen(resp)); 200 goto top; 201 ioerror: 202 error(errno); 203 goto top; 204 } 205 206 void 207 getstring(bp) 208 char *bp; 209 { 210 int i; 211 char *cp = bp; 212 213 for (i = 0; i < SSIZE; i++) { 214 if (read(0, cp+i, 1) != 1) 215 exit(0); 216 if (cp[i] == '\n') 217 break; 218 } 219 cp[i] = '\0'; 220 } 221 222 char * 223 checkbuf(record, size) 224 char *record; 225 int size; 226 { 227 228 if (size <= maxrecsize) 229 return (record); 230 if (record != 0) 231 free(record); 232 record = malloc(size); 233 if (record == 0) { 234 DEBUG("rmtd: cannot allocate buffer space\n"); 235 exit(4); 236 } 237 maxrecsize = size; 238 while (size > 1024 && 239 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 240 size -= 1024; 241 return (record); 242 } 243 244 void 245 error(num) 246 int num; 247 { 248 249 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 250 snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num)); 251 write(1, resp, strlen(resp)); 252 } 253