1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 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/* 33 * rmt 34 */ 35#include <sys/types.h> 36#include <sys/socket.h> 37#include <sys/mtio.h> 38#include <errno.h> 39#include <fcntl.h> 40#include <stdio.h> 41#include <stdlib.h> 42#include <string.h> 43#include <unistd.h> 44 45static int tape = -1; 46 47static char *record; 48static int maxrecsize = -1; 49 50#define SSIZE 64 51static char device[SSIZE]; 52static char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE]; 53 54static char resp[BUFSIZ]; 55 56static FILE *debug; 57#define DEBUG(f) if (debug) fprintf(debug, f) 58#define DEBUG1(f,a) if (debug) fprintf(debug, f, a) 59#define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) 60 61static char *checkbuf(char *, int); 62static void error(int); 63static void getstring(char *); 64 65int 66main(int argc, char **argv) 67{ 68 int rval; 69 char c; 70 int n, i, cc; 71 72 argc--, argv++; 73 if (argc > 0) { 74 debug = fopen(*argv, "w"); 75 if (debug == NULL) { 76 DEBUG1("rmtd: error to open %s\n", *argv); 77 exit(1); 78 } 79 (void)setbuf(debug, (char *)0); 80 } 81top: 82 errno = 0; 83 rval = 0; 84 if (read(STDIN_FILENO, &c, 1) != 1) 85 exit(0); 86 switch (c) { 87 88 case 'O': 89 if (tape >= 0) 90 (void) close(tape); 91 getstring(device); 92 getstring(mode); 93 DEBUG2("rmtd: O %s %s\n", device, mode); 94 /* 95 * XXX the rmt protocol does not provide a means to 96 * specify the permission bits; allow rw for everyone, 97 * as modified by the users umask 98 */ 99 tape = open(device, atoi(mode), 0666); 100 if (tape < 0) 101 goto ioerror; 102 goto respond; 103 104 case 'C': 105 DEBUG("rmtd: C\n"); 106 getstring(device); /* discard */ 107 if (close(tape) < 0) 108 goto ioerror; 109 tape = -1; 110 goto respond; 111 112 case 'L': 113 getstring(count); 114 getstring(pos); 115 DEBUG2("rmtd: L %s %s\n", count, pos); 116 rval = lseek(tape, (off_t)strtoll(count, NULL, 10), 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(STDIN_FILENO, &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(STDOUT_FILENO, resp, strlen(resp)); 148 (void)write(STDOUT_FILENO, record, rval); 149 goto top; 150 151 case 'I': 152 getstring(op); 153 getstring(count); 154 DEBUG2("rmtd: I %s %s\n", op, count); 155 { struct mtop mtop; 156 mtop.mt_op = atoi(op); 157 mtop.mt_count = atoi(count); 158 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 159 goto ioerror; 160 rval = mtop.mt_count; 161 } 162 goto respond; 163 164 case 'S': /* status */ 165 DEBUG("rmtd: S\n"); 166 { struct mtget mtget; 167 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 168 goto ioerror; 169 rval = sizeof (mtget); 170 if (rval > 24) /* original mtget structure size */ 171 rval = 24; 172 (void)sprintf(resp, "A%d\n", rval); 173 (void)write(STDOUT_FILENO, resp, strlen(resp)); 174 (void)write(STDOUT_FILENO, (char *)&mtget, rval); 175 goto top; 176 } 177 178 case 'V': /* version */ 179 getstring(op); 180 DEBUG1("rmtd: V %s\n", op); 181 rval = 2; 182 goto respond; 183 184 default: 185 DEBUG1("rmtd: garbage command %c\n", c); 186 exit(3); 187 } 188respond: 189 DEBUG1("rmtd: A %d\n", rval); 190 (void)sprintf(resp, "A%d\n", rval); 191 (void)write(STDOUT_FILENO, resp, strlen(resp)); 192 goto top; 193ioerror: 194 error(errno); 195 goto top; 196} 197 198void 199getstring(char *bp) 200{ 201 int i; 202 char *cp = bp; 203 204 for (i = 0; i < SSIZE; i++) { 205 if (read(STDIN_FILENO, cp+i, 1) != 1) 206 exit(0); 207 if (cp[i] == '\n') 208 break; 209 } 210 cp[i] = '\0'; 211} 212 213static char * 214checkbuf(char *rec, int size) 215{ 216 217 if (size <= maxrecsize) 218 return (rec); 219 if (rec != NULL) 220 free(rec); 221 rec = malloc(size); 222 if (rec == NULL) { 223 DEBUG("rmtd: cannot allocate buffer space\n"); 224 exit(4); 225 } 226 maxrecsize = size; 227 while (size > 1024 && 228 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 229 size -= 1024; 230 return (rec); 231} 232 233static void 234error(int num) 235{ 236 237 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 238 (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num)); 239 (void)write(STDOUT_FILENO, resp, strlen(resp)); 240} 241