1 /* $NetBSD: rmt.c,v 1.17 2018/01/23 21:06:25 sevan Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)rmt.c 8.1 (Berkeley) 6/6/93"; 41 #else 42 __RCSID("$NetBSD: rmt.c,v 1.17 2018/01/23 21:06:25 sevan Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 /* 47 * rmt 48 */ 49 #include <sys/types.h> 50 #include <sys/ioctl.h> 51 #include <sys/mtio.h> 52 #include <sys/socket.h> 53 #include <sys/stat.h> 54 55 #include <errno.h> 56 #include <fcntl.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 62 int tape = -1; 63 64 int maxrecsize = -1; 65 66 #define SSIZE 64 67 char device[SSIZE]; 68 char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE]; 69 70 char resp[BUFSIZ]; 71 72 FILE *debug; 73 #define DEBUG(f) if (debug) fprintf(debug, f) 74 #define DEBUG1(f,a) if (debug) fprintf(debug, f, a) 75 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) 76 77 char *checkbuf(char *, int); 78 void error(int); 79 void getstring(char *, size_t); 80 81 int 82 main(int argc, char *argv[]) 83 { 84 char *record = NULL; 85 int rval; 86 char c; 87 int n, i, cc; 88 89 argc--, argv++; 90 if (argc > 0) { 91 debug = fopen(*argv, "w"); 92 if (debug == 0) 93 exit(1); 94 (void)setbuf(debug, (char *)0); 95 } 96 top: 97 errno = 0; 98 rval = 0; 99 if (read(STDIN_FILENO, &c, 1) != 1) 100 exit(0); 101 switch (c) { 102 103 case 'O': 104 if (tape >= 0) 105 (void) close(tape); 106 getstring(device, sizeof(device)); 107 getstring(mode, sizeof(mode)); 108 DEBUG2("rmtd: O %s %s\n", device, mode); 109 tape = open(device, atoi(mode), 110 S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); 111 if (tape < 0) 112 goto ioerror; 113 goto respond; 114 115 case 'C': 116 DEBUG("rmtd: C\n"); 117 getstring(device, sizeof(device)); /* discard */ 118 if (close(tape) < 0) 119 goto ioerror; 120 tape = -1; 121 goto respond; 122 123 case 'L': 124 getstring(count, sizeof(count)); 125 getstring(pos, sizeof(pos)); 126 DEBUG2("rmtd: L %s %s\n", count, pos); 127 rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos)); 128 if (rval < 0) 129 goto ioerror; 130 goto respond; 131 132 case 'W': 133 getstring(count, sizeof(count)); 134 n = atoi(count); 135 DEBUG1("rmtd: W %s\n", count); 136 record = checkbuf(record, n); 137 for (i = 0; i < n; i += cc) { 138 cc = read(STDIN_FILENO, &record[i], n - i); 139 if (cc <= 0) { 140 DEBUG("rmtd: premature eof\n"); 141 exit(2); 142 } 143 } 144 rval = write(tape, record, n); 145 if (rval < 0) 146 goto ioerror; 147 goto respond; 148 149 case 'R': 150 getstring(count, sizeof(count)); 151 DEBUG1("rmtd: R %s\n", count); 152 n = atoi(count); 153 record = checkbuf(record, n); 154 rval = read(tape, record, n); 155 if (rval < 0) 156 goto ioerror; 157 (void)snprintf(resp, sizeof(resp), "A%d\n", rval); 158 (void)write(STDOUT_FILENO, resp, strlen(resp)); 159 (void)write(STDOUT_FILENO, record, rval); 160 goto top; 161 162 case 'I': 163 getstring(op, sizeof(op)); 164 getstring(count, sizeof(count)); 165 DEBUG2("rmtd: I %s %s\n", op, count); 166 { 167 struct mtop mtop; 168 169 mtop.mt_op = atoi(op); 170 mtop.mt_count = atoi(count); 171 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 172 goto ioerror; 173 rval = mtop.mt_count; 174 } 175 goto respond; 176 177 case 'S': /* status */ 178 DEBUG("rmtd: S\n"); 179 { 180 struct mtget mtget; 181 182 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 183 goto ioerror; 184 rval = sizeof (mtget); 185 /* limit size to 'original' mtget size */ 186 if (rval > 24) 187 rval = 24; 188 (void)snprintf(resp, sizeof(resp), "A%d\n", rval); 189 (void)write(STDOUT_FILENO, resp, strlen(resp)); 190 (void)write(STDOUT_FILENO, (char *)&mtget, rval); 191 goto top; 192 } 193 194 default: 195 DEBUG1("rmtd: garbage command %c\n", c); 196 exit(3); 197 } 198 respond: 199 DEBUG1("rmtd: A %d\n", rval); 200 (void)snprintf(resp, sizeof(resp), "A%d\n", rval); 201 (void)write(STDOUT_FILENO, resp, strlen(resp)); 202 goto top; 203 ioerror: 204 error(errno); 205 goto top; 206 } 207 208 void 209 getstring(char *bp, size_t size) 210 { 211 char *cp = bp; 212 char *ep = bp + size - 1; 213 214 do { 215 if (read(STDIN_FILENO, cp, 1) != 1) 216 exit(0); 217 } while (*cp != '\n' && ++cp < ep); 218 *cp = '\0'; 219 } 220 221 char * 222 checkbuf(char *record, int size) 223 { 224 225 if (size <= maxrecsize) 226 return (record); 227 if (record != 0) 228 free(record); 229 record = malloc(size); 230 if (record == 0) { 231 DEBUG("rmtd: cannot allocate buffer space\n"); 232 exit(4); 233 } 234 maxrecsize = size; 235 while (size > 1024 && 236 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 237 size -= 1024; 238 return (record); 239 } 240 241 void 242 error(int num) 243 { 244 245 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 246 (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num)); 247 (void)write(STDOUT_FILENO, resp, strlen(resp)); 248 } 249
Indexes created Sat Sep 20 22:09:52 GMT 2025