1 /* $NetBSD: rmt.c,v 1.16 2009/04/18 09:25:50 lukem 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 1.16 2009/04/18 09:25:50 lukem 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 __P((char *, int)); 78 void error __P((int)); 79 int main __P((int, char **)); 80 void getstring __P((char *, size_t)); 81 82 int 83 main(argc, argv) 84 int argc; 85 char **argv; 86 { 87 char *record = NULL; 88 int rval; 89 char c; 90 int n, i, cc; 91 92 argc--, argv++; 93 if (argc > 0) { 94 debug = fopen(*argv, "w"); 95 if (debug == 0) 96 exit(1); 97 (void)setbuf(debug, (char *)0); 98 } 99 top: 100 errno = 0; 101 rval = 0; 102 if (read(STDIN_FILENO, &c, 1) != 1) 103 exit(0); 104 switch (c) { 105 106 case 'O': 107 if (tape >= 0) 108 (void) close(tape); 109 getstring(device, sizeof(device)); 110 getstring(mode, sizeof(mode)); 111 DEBUG2("rmtd: O %s %s\n", device, mode); 112 tape = open(device, atoi(mode), 113 S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); 114 if (tape < 0) 115 goto ioerror; 116 goto respond; 117 118 case 'C': 119 DEBUG("rmtd: C\n"); 120 getstring(device, sizeof(device)); /* discard */ 121 if (close(tape) < 0) 122 goto ioerror; 123 tape = -1; 124 goto respond; 125 126 case 'L': 127 getstring(count, sizeof(count)); 128 getstring(pos, sizeof(pos)); 129 DEBUG2("rmtd: L %s %s\n", count, pos); 130 rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos)); 131 if (rval < 0) 132 goto ioerror; 133 goto respond; 134 135 case 'W': 136 getstring(count, sizeof(count)); 137 n = atoi(count); 138 DEBUG1("rmtd: W %s\n", count); 139 record = checkbuf(record, n); 140 for (i = 0; i < n; i += cc) { 141 cc = read(STDIN_FILENO, &record[i], n - i); 142 if (cc <= 0) { 143 DEBUG("rmtd: premature eof\n"); 144 exit(2); 145 } 146 } 147 rval = write(tape, record, n); 148 if (rval < 0) 149 goto ioerror; 150 goto respond; 151 152 case 'R': 153 getstring(count, sizeof(count)); 154 DEBUG1("rmtd: R %s\n", count); 155 n = atoi(count); 156 record = checkbuf(record, n); 157 rval = read(tape, record, n); 158 if (rval < 0) 159 goto ioerror; 160 (void)snprintf(resp, sizeof(resp), "A%d\n", rval); 161 (void)write(STDOUT_FILENO, resp, strlen(resp)); 162 (void)write(STDOUT_FILENO, record, rval); 163 goto top; 164 165 case 'I': 166 getstring(op, sizeof(op)); 167 getstring(count, sizeof(count)); 168 DEBUG2("rmtd: I %s %s\n", op, count); 169 { 170 struct mtop mtop; 171 172 mtop.mt_op = atoi(op); 173 mtop.mt_count = atoi(count); 174 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 175 goto ioerror; 176 rval = mtop.mt_count; 177 } 178 goto respond; 179 180 case 'S': /* status */ 181 DEBUG("rmtd: S\n"); 182 { 183 struct mtget mtget; 184 185 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 186 goto ioerror; 187 rval = sizeof (mtget); 188 /* limit size to 'original' mtget size */ 189 if (rval > 24) 190 rval = 24; 191 (void)snprintf(resp, sizeof(resp), "A%d\n", rval); 192 (void)write(STDOUT_FILENO, resp, strlen(resp)); 193 (void)write(STDOUT_FILENO, (char *)&mtget, rval); 194 goto top; 195 } 196 197 default: 198 DEBUG1("rmtd: garbage command %c\n", c); 199 exit(3); 200 } 201 respond: 202 DEBUG1("rmtd: A %d\n", rval); 203 (void)snprintf(resp, sizeof(resp), "A%d\n", rval); 204 (void)write(STDOUT_FILENO, resp, strlen(resp)); 205 goto top; 206 ioerror: 207 error(errno); 208 goto top; 209 } 210 211 void 212 getstring(bp, size) 213 char *bp; 214 size_t size; 215 { 216 char *cp = bp; 217 char *ep = bp + size - 1; 218 219 do { 220 if (read(STDIN_FILENO, cp, 1) != 1) 221 exit(0); 222 } while (*cp != '\n' && ++cp < ep); 223 *cp = '\0'; 224 } 225 226 char * 227 checkbuf(record, size) 228 char *record; 229 int size; 230 { 231 232 if (size <= maxrecsize) 233 return (record); 234 if (record != 0) 235 free(record); 236 record = malloc(size); 237 if (record == 0) { 238 DEBUG("rmtd: cannot allocate buffer space\n"); 239 exit(4); 240 } 241 maxrecsize = size; 242 while (size > 1024 && 243 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 244 size -= 1024; 245 return (record); 246 } 247 248 void 249 error(num) 250 int num; 251 { 252 253 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 254 (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num)); 255 (void)write(STDOUT_FILENO, resp, strlen(resp)); 256 } 257