1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * 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 34 #ifndef lint 35 char copyright[] = 36 "@(#) Copyright (c) 1983 Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)rmt.c 5.6 (Berkeley) 6/1/90";*/ 42 static char rcsid[] = "$Id: rmt.c,v 1.6 1995/04/13 02:07:23 mycroft Exp $"; 43 #endif /* not lint */ 44 45 /* 46 * rmt 47 */ 48 #include <stdio.h> 49 #include <sgtty.h> 50 #include <sys/types.h> 51 #include <sys/socket.h> 52 #include <sys/stat.h> 53 #include <sys/mtio.h> 54 #include <errno.h> 55 #include <string.h> 56 57 int tape = -1; 58 59 char *record; 60 int maxrecsize = -1; 61 char *checkbuf(); 62 63 #define SSIZE 64 64 char device[SSIZE]; 65 char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE]; 66 67 char resp[BUFSIZ]; 68 69 FILE *debug; 70 #define DEBUG(f) if (debug) fprintf(debug, f) 71 #define DEBUG1(f,a) if (debug) fprintf(debug, f, a) 72 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) 73 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 (void) 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 (void) close(tape); 99 getstring(device); getstring(mode); 100 DEBUG2("rmtd: O %s %s\n", device, mode); 101 tape = open(device, atoi(mode), 102 S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); 103 if (tape < 0) 104 goto ioerror; 105 goto respond; 106 107 case 'C': 108 DEBUG("rmtd: C\n"); 109 getstring(device); /* discard */ 110 if (close(tape) < 0) 111 goto ioerror; 112 tape = -1; 113 goto respond; 114 115 case 'L': 116 getstring(count); getstring(pos); 117 DEBUG2("rmtd: L %s %s\n", count, pos); 118 rval = lseek(tape, atoi(count), atoi(pos)); 119 if (rval < 0) 120 goto ioerror; 121 goto respond; 122 123 case 'W': 124 getstring(count); 125 n = atoi(count); 126 DEBUG1("rmtd: W %s\n", count); 127 record = checkbuf(record, n); 128 for (i = 0; i < n; i += cc) { 129 cc = read(0, &record[i], n - i); 130 if (cc <= 0) { 131 DEBUG("rmtd: premature eof\n"); 132 exit(2); 133 } 134 } 135 rval = write(tape, record, n); 136 if (rval < 0) 137 goto ioerror; 138 goto respond; 139 140 case 'R': 141 getstring(count); 142 DEBUG1("rmtd: R %s\n", count); 143 n = atoi(count); 144 record = checkbuf(record, n); 145 rval = read(tape, record, n); 146 if (rval < 0) 147 goto ioerror; 148 (void) sprintf(resp, "A%d\n", rval); 149 (void) write(1, resp, strlen(resp)); 150 (void) write(1, record, rval); 151 goto top; 152 153 case 'I': 154 getstring(op); 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 (void) sprintf(resp, "A%d\n", rval); 172 (void) write(1, resp, strlen(resp)); 173 (void) write(1, (char *)&mtget, sizeof (mtget)); 174 goto top; 175 } 176 177 default: 178 DEBUG1("rmtd: garbage command %c\n", c); 179 exit(3); 180 } 181 respond: 182 DEBUG1("rmtd: A %d\n", rval); 183 (void) sprintf(resp, "A%d\n", rval); 184 (void) write(1, resp, strlen(resp)); 185 goto top; 186 ioerror: 187 error(errno); 188 goto top; 189 } 190 191 getstring(bp) 192 char *bp; 193 { 194 int i; 195 char *cp = bp; 196 197 for (i = 0; i < SSIZE; i++) { 198 if (read(0, cp+i, 1) != 1) 199 exit(0); 200 if (cp[i] == '\n') 201 break; 202 } 203 cp[i] = '\0'; 204 } 205 206 char * 207 checkbuf(record, size) 208 char *record; 209 int size; 210 { 211 extern char *malloc(); 212 213 if (size <= maxrecsize) 214 return (record); 215 if (record != 0) 216 free(record); 217 record = malloc(size); 218 if (record == 0) { 219 DEBUG("rmtd: cannot allocate buffer space\n"); 220 exit(4); 221 } 222 maxrecsize = size; 223 while (size > 1024 && 224 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 225 size -= 1024; 226 return (record); 227 } 228 229 error(num) 230 int num; 231 { 232 233 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 234 (void) sprintf(resp, "E%d\n%s\n", num, strerror(num)); 235 (void) write(1, resp, strlen(resp)); 236 } 237