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 } 247