1 /* $NetBSD: rmt.c,v 1.12 2002/07/04 06:43:19 itojun 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)rmt.c 8.1 (Berkeley) 6/6/93"; 45 #else 46 __RCSID("$NetBSD: rmt.c,v 1.12 2002/07/04 06:43:19 itojun Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * rmt 52 */ 53 #include <sys/types.h> 54 #include <sys/ioctl.h> 55 #include <sys/mtio.h> 56 #include <sys/socket.h> 57 #include <sys/stat.h> 58 59 #include <errno.h> 60 #include <fcntl.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 66 int tape = -1; 67 68 char *record; 69 int maxrecsize = -1; 70 71 #define SSIZE 64 72 char device[SSIZE]; 73 char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE]; 74 75 char resp[BUFSIZ]; 76 77 FILE *debug; 78 #define DEBUG(f) if (debug) fprintf(debug, f) 79 #define DEBUG1(f,a) if (debug) fprintf(debug, f, a) 80 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) 81 82 char *checkbuf __P((char *, int)); 83 void error __P((int)); 84 int main __P((int, char **)); 85 void getstring __P((char *, size_t)); 86 87 int 88 main(argc, argv) 89 int argc; 90 char **argv; 91 { 92 int rval; 93 char c; 94 int n, i, cc; 95 96 argc--, argv++; 97 if (argc > 0) { 98 debug = fopen(*argv, "w"); 99 if (debug == 0) 100 exit(1); 101 (void)setbuf(debug, (char *)0); 102 } 103 top: 104 errno = 0; 105 rval = 0; 106 if (read(STDIN_FILENO, &c, 1) != 1) 107 exit(0); 108 switch (c) { 109 110 case 'O': 111 if (tape >= 0) 112 (void) close(tape); 113 getstring(device, sizeof(device)); 114 getstring(mode, sizeof(mode)); 115 DEBUG2("rmtd: O %s %s\n", device, mode); 116 tape = open(device, atoi(mode), 117 S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); 118 if (tape < 0) 119 goto ioerror; 120 goto respond; 121 122 case 'C': 123 DEBUG("rmtd: C\n"); 124 getstring(device, sizeof(device)); /* discard */ 125 if (close(tape) < 0) 126 goto ioerror; 127 tape = -1; 128 goto respond; 129 130 case 'L': 131 getstring(count, sizeof(count)); 132 getstring(pos, sizeof(pos)); 133 DEBUG2("rmtd: L %s %s\n", count, pos); 134 rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos)); 135 if (rval < 0) 136 goto ioerror; 137 goto respond; 138 139 case 'W': 140 getstring(count, sizeof(count)); 141 n = atoi(count); 142 DEBUG1("rmtd: W %s\n", count); 143 record = checkbuf(record, n); 144 for (i = 0; i < n; i += cc) { 145 cc = read(STDIN_FILENO, &record[i], n - i); 146 if (cc <= 0) { 147 DEBUG("rmtd: premature eof\n"); 148 exit(2); 149 } 150 } 151 rval = write(tape, record, n); 152 if (rval < 0) 153 goto ioerror; 154 goto respond; 155 156 case 'R': 157 getstring(count, sizeof(count)); 158 DEBUG1("rmtd: R %s\n", count); 159 n = atoi(count); 160 record = checkbuf(record, n); 161 rval = read(tape, record, n); 162 if (rval < 0) 163 goto ioerror; 164 (void)sprintf(resp, "A%d\n", rval); 165 (void)write(STDOUT_FILENO, resp, strlen(resp)); 166 (void)write(STDOUT_FILENO, record, rval); 167 goto top; 168 169 case 'I': 170 getstring(op, sizeof(op)); 171 getstring(count, sizeof(count)); 172 DEBUG2("rmtd: I %s %s\n", op, count); 173 { 174 struct mtop mtop; 175 176 mtop.mt_op = atoi(op); 177 mtop.mt_count = atoi(count); 178 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 179 goto ioerror; 180 rval = mtop.mt_count; 181 } 182 goto respond; 183 184 case 'S': /* status */ 185 DEBUG("rmtd: S\n"); 186 { 187 struct mtget mtget; 188 189 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 190 goto ioerror; 191 rval = sizeof (mtget); 192 /* limit size to 'original' mtget size */ 193 if (rval > 24) 194 rval = 24; 195 (void)sprintf(resp, "A%d\n", rval); 196 (void)write(STDOUT_FILENO, resp, strlen(resp)); 197 (void)write(STDOUT_FILENO, (char *)&mtget, rval); 198 goto top; 199 } 200 201 default: 202 DEBUG1("rmtd: garbage command %c\n", c); 203 exit(3); 204 } 205 respond: 206 DEBUG1("rmtd: A %d\n", rval); 207 (void)sprintf(resp, "A%d\n", rval); 208 (void)write(STDOUT_FILENO, resp, strlen(resp)); 209 goto top; 210 ioerror: 211 error(errno); 212 goto top; 213 } 214 215 void 216 getstring(bp, size) 217 char *bp; 218 size_t size; 219 { 220 char *cp = bp; 221 char *ep = bp + size - 1; 222 223 do { 224 if (read(STDIN_FILENO, cp, 1) != 1) 225 exit(0); 226 } while (*cp != '\n' && ++cp < ep); 227 *cp = '\0'; 228 } 229 230 char * 231 checkbuf(record, size) 232 char *record; 233 int size; 234 { 235 236 if (size <= maxrecsize) 237 return (record); 238 if (record != 0) 239 free(record); 240 record = malloc(size); 241 if (record == 0) { 242 DEBUG("rmtd: cannot allocate buffer space\n"); 243 exit(4); 244 } 245 maxrecsize = size; 246 while (size > 1024 && 247 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 248 size -= 1024; 249 return (record); 250 } 251 252 void 253 error(num) 254 int num; 255 { 256 257 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 258 (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num)); 259 (void)write(STDOUT_FILENO, resp, strlen(resp)); 260 } 261