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