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 1.4 1994/03/30 02:33:23 cgd 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/mtio.h> 53 #include <errno.h> 54 #include <string.h> 55 56 int tape = -1; 57 58 char *record; 59 int maxrecsize = -1; 60 char *checkbuf(); 61 62 #define SSIZE 64 63 char device[SSIZE]; 64 char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE]; 65 66 char resp[BUFSIZ]; 67 68 FILE *debug; 69 #define DEBUG(f) if (debug) fprintf(debug, f) 70 #define DEBUG1(f,a) if (debug) fprintf(debug, f, a) 71 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) 72 73 main(argc, argv) 74 int argc; 75 char **argv; 76 { 77 int rval; 78 char c; 79 int n, i, cc; 80 81 argc--, argv++; 82 if (argc > 0) { 83 debug = fopen(*argv, "w"); 84 if (debug == 0) 85 exit(1); 86 (void) setbuf(debug, (char *)0); 87 } 88 top: 89 errno = 0; 90 rval = 0; 91 if (read(0, &c, 1) != 1) 92 exit(0); 93 switch (c) { 94 95 case 'O': 96 if (tape >= 0) 97 (void) close(tape); 98 getstring(device); getstring(mode); 99 DEBUG2("rmtd: O %s %s\n", device, mode); 100 tape = open(device, atoi(mode)); 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); getstring(pos); 115 DEBUG2("rmtd: L %s %s\n", count, pos); 116 rval = lseek(tape, atoi(count), atoi(pos)); 117 if (rval < 0) 118 goto ioerror; 119 goto respond; 120 121 case 'W': 122 getstring(count); 123 n = atoi(count); 124 DEBUG1("rmtd: W %s\n", count); 125 record = checkbuf(record, n); 126 for (i = 0; i < n; i += cc) { 127 cc = read(0, &record[i], n - i); 128 if (cc <= 0) { 129 DEBUG("rmtd: premature eof\n"); 130 exit(2); 131 } 132 } 133 rval = write(tape, record, n); 134 if (rval < 0) 135 goto ioerror; 136 goto respond; 137 138 case 'R': 139 getstring(count); 140 DEBUG1("rmtd: R %s\n", count); 141 n = atoi(count); 142 record = checkbuf(record, n); 143 rval = read(tape, record, n); 144 if (rval < 0) 145 goto ioerror; 146 (void) sprintf(resp, "A%d\n", rval); 147 (void) write(1, resp, strlen(resp)); 148 (void) write(1, record, rval); 149 goto top; 150 151 case 'I': 152 getstring(op); getstring(count); 153 DEBUG2("rmtd: I %s %s\n", op, count); 154 { struct mtop mtop; 155 mtop.mt_op = atoi(op); 156 mtop.mt_count = atoi(count); 157 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 158 goto ioerror; 159 rval = mtop.mt_count; 160 } 161 goto respond; 162 163 case 'S': /* status */ 164 DEBUG("rmtd: S\n"); 165 { struct mtget mtget; 166 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 167 goto ioerror; 168 rval = sizeof (mtget); 169 (void) sprintf(resp, "A%d\n", rval); 170 (void) write(1, resp, strlen(resp)); 171 (void) write(1, (char *)&mtget, sizeof (mtget)); 172 goto top; 173 } 174 175 default: 176 DEBUG1("rmtd: garbage command %c\n", c); 177 exit(3); 178 } 179 respond: 180 DEBUG1("rmtd: A %d\n", rval); 181 (void) sprintf(resp, "A%d\n", rval); 182 (void) write(1, resp, strlen(resp)); 183 goto top; 184 ioerror: 185 error(errno); 186 goto top; 187 } 188 189 getstring(bp) 190 char *bp; 191 { 192 int i; 193 char *cp = bp; 194 195 for (i = 0; i < SSIZE; i++) { 196 if (read(0, cp+i, 1) != 1) 197 exit(0); 198 if (cp[i] == '\n') 199 break; 200 } 201 cp[i] = '\0'; 202 } 203 204 char * 205 checkbuf(record, size) 206 char *record; 207 int size; 208 { 209 extern char *malloc(); 210 211 if (size <= maxrecsize) 212 return (record); 213 if (record != 0) 214 free(record); 215 record = malloc(size); 216 if (record == 0) { 217 DEBUG("rmtd: cannot allocate buffer space\n"); 218 exit(4); 219 } 220 maxrecsize = size; 221 while (size > 1024 && 222 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 223 size -= 1024; 224 return (record); 225 } 226 227 error(num) 228 int num; 229 { 230 231 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 232 (void) sprintf(resp, "E%d\n%s\n", num, strerror(num)); 233 (void) write(1, resp, strlen(resp)); 234 } 235