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 #if 0 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1983, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #endif 40 #include <sys/cdefs.h> 41 /* 42 * rmt 43 */ 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 #include <sys/mtio.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 static int tape = -1; 55 56 static char *record; 57 static int maxrecsize = -1; 58 59 #define SSIZE 64 60 static char device[SSIZE]; 61 static char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE]; 62 63 static char resp[BUFSIZ]; 64 65 static FILE *debug; 66 #define DEBUG(f) if (debug) fprintf(debug, f) 67 #define DEBUG1(f,a) if (debug) fprintf(debug, f, a) 68 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) 69 70 static char *checkbuf(char *, int); 71 static void error(int); 72 static void getstring(char *); 73 74 int 75 main(int argc, 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 == NULL) { 85 DEBUG1("rmtd: error to open %s\n", *argv); 86 exit(1); 87 } 88 (void)setbuf(debug, (char *)0); 89 } 90 top: 91 errno = 0; 92 rval = 0; 93 if (read(STDIN_FILENO, &c, 1) != 1) 94 exit(0); 95 switch (c) { 96 97 case 'O': 98 if (tape >= 0) 99 (void) close(tape); 100 getstring(device); 101 getstring(mode); 102 DEBUG2("rmtd: O %s %s\n", device, mode); 103 /* 104 * XXX the rmt protocol does not provide a means to 105 * specify the permission bits; allow rw for everyone, 106 * as modified by the users umask 107 */ 108 tape = open(device, atoi(mode), 0666); 109 if (tape < 0) 110 goto ioerror; 111 goto respond; 112 113 case 'C': 114 DEBUG("rmtd: C\n"); 115 getstring(device); /* discard */ 116 if (close(tape) < 0) 117 goto ioerror; 118 tape = -1; 119 goto respond; 120 121 case 'L': 122 getstring(count); 123 getstring(pos); 124 DEBUG2("rmtd: L %s %s\n", count, pos); 125 rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos)); 126 if (rval < 0) 127 goto ioerror; 128 goto respond; 129 130 case 'W': 131 getstring(count); 132 n = atoi(count); 133 DEBUG1("rmtd: W %s\n", count); 134 record = checkbuf(record, n); 135 for (i = 0; i < n; i += cc) { 136 cc = read(STDIN_FILENO, &record[i], n - i); 137 if (cc <= 0) { 138 DEBUG("rmtd: premature eof\n"); 139 exit(2); 140 } 141 } 142 rval = write(tape, record, n); 143 if (rval < 0) 144 goto ioerror; 145 goto respond; 146 147 case 'R': 148 getstring(count); 149 DEBUG1("rmtd: R %s\n", count); 150 n = atoi(count); 151 record = checkbuf(record, n); 152 rval = read(tape, record, n); 153 if (rval < 0) 154 goto ioerror; 155 (void)sprintf(resp, "A%d\n", rval); 156 (void)write(STDOUT_FILENO, resp, strlen(resp)); 157 (void)write(STDOUT_FILENO, record, rval); 158 goto top; 159 160 case 'I': 161 getstring(op); 162 getstring(count); 163 DEBUG2("rmtd: I %s %s\n", op, count); 164 { struct mtop mtop; 165 mtop.mt_op = atoi(op); 166 mtop.mt_count = atoi(count); 167 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 168 goto ioerror; 169 rval = mtop.mt_count; 170 } 171 goto respond; 172 173 case 'S': /* status */ 174 DEBUG("rmtd: S\n"); 175 { struct mtget mtget; 176 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 177 goto ioerror; 178 rval = sizeof (mtget); 179 if (rval > 24) /* original mtget structure size */ 180 rval = 24; 181 (void)sprintf(resp, "A%d\n", rval); 182 (void)write(STDOUT_FILENO, resp, strlen(resp)); 183 (void)write(STDOUT_FILENO, (char *)&mtget, rval); 184 goto top; 185 } 186 187 case 'V': /* version */ 188 getstring(op); 189 DEBUG1("rmtd: V %s\n", op); 190 rval = 2; 191 goto respond; 192 193 default: 194 DEBUG1("rmtd: garbage command %c\n", c); 195 exit(3); 196 } 197 respond: 198 DEBUG1("rmtd: A %d\n", rval); 199 (void)sprintf(resp, "A%d\n", rval); 200 (void)write(STDOUT_FILENO, resp, strlen(resp)); 201 goto top; 202 ioerror: 203 error(errno); 204 goto top; 205 } 206 207 void 208 getstring(char *bp) 209 { 210 int i; 211 char *cp = bp; 212 213 for (i = 0; i < SSIZE; i++) { 214 if (read(STDIN_FILENO, cp+i, 1) != 1) 215 exit(0); 216 if (cp[i] == '\n') 217 break; 218 } 219 cp[i] = '\0'; 220 } 221 222 static char * 223 checkbuf(char *rec, int size) 224 { 225 226 if (size <= maxrecsize) 227 return (rec); 228 if (rec != NULL) 229 free(rec); 230 rec = malloc(size); 231 if (rec == NULL) { 232 DEBUG("rmtd: cannot allocate buffer space\n"); 233 exit(4); 234 } 235 maxrecsize = size; 236 while (size > 1024 && 237 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 238 size -= 1024; 239 return (rec); 240 } 241 242 static void 243 error(int num) 244 { 245 246 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 247 (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num)); 248 (void)write(STDOUT_FILENO, resp, strlen(resp)); 249 } 250