rmt.c revision 1.8
1 /* $NetBSD: rmt.c,v 1.8 1997/10/17 08:05:30 mrg 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 #ifndef lint 37 static char copyright[] = 38 "@(#) 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 static char rcsid[] = "$NetBSD: rmt.c,v 1.8 1997/10/17 08:05:30 mrg 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 void getstring __P((char *)); 85 86 int 87 main(argc, argv) 88 int argc; 89 char **argv; 90 { 91 int rval; 92 char c; 93 int n, i, cc; 94 95 argc--, argv++; 96 if (argc > 0) { 97 debug = fopen(*argv, "w"); 98 if (debug == 0) 99 exit(1); 100 (void)setbuf(debug, (char *)0); 101 } 102 top: 103 errno = 0; 104 rval = 0; 105 if (read(STDIN_FILENO, &c, 1) != 1) 106 exit(0); 107 switch (c) { 108 109 case 'O': 110 if (tape >= 0) 111 (void) close(tape); 112 getstring(device); 113 getstring(mode); 114 DEBUG2("rmtd: O %s %s\n", device, mode); 115 tape = open(device, atoi(mode), 116 S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); 117 if (tape < 0) 118 goto ioerror; 119 goto respond; 120 121 case 'C': 122 DEBUG("rmtd: C\n"); 123 getstring(device); /* discard */ 124 if (close(tape) < 0) 125 goto ioerror; 126 tape = -1; 127 goto respond; 128 129 case 'L': 130 getstring(count); 131 getstring(pos); 132 DEBUG2("rmtd: L %s %s\n", count, pos); 133 rval = lseek(tape, (off_t)strtoq(count, NULL, 10), atoi(pos)); 134 if (rval < 0) 135 goto ioerror; 136 goto respond; 137 138 case 'W': 139 getstring(count); 140 n = atoi(count); 141 DEBUG1("rmtd: W %s\n", count); 142 record = checkbuf(record, n); 143 for (i = 0; i < n; i += cc) { 144 cc = read(STDIN_FILENO, &record[i], n - i); 145 if (cc <= 0) { 146 DEBUG("rmtd: premature eof\n"); 147 exit(2); 148 } 149 } 150 rval = write(tape, record, n); 151 if (rval < 0) 152 goto ioerror; 153 goto respond; 154 155 case 'R': 156 getstring(count); 157 DEBUG1("rmtd: R %s\n", count); 158 n = atoi(count); 159 record = checkbuf(record, n); 160 rval = read(tape, record, n); 161 if (rval < 0) 162 goto ioerror; 163 (void)sprintf(resp, "A%d\n", rval); 164 (void)write(STDOUT_FILENO, resp, strlen(resp)); 165 (void)write(STDOUT_FILENO, record, rval); 166 goto top; 167 168 case 'I': 169 getstring(op); 170 getstring(count); 171 DEBUG2("rmtd: I %s %s\n", op, count); 172 { 173 struct mtop mtop; 174 175 mtop.mt_op = atoi(op); 176 mtop.mt_count = atoi(count); 177 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 178 goto ioerror; 179 rval = mtop.mt_count; 180 } 181 goto respond; 182 183 case 'S': /* status */ 184 DEBUG("rmtd: S\n"); 185 { 186 struct mtget mtget; 187 188 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 189 goto ioerror; 190 rval = sizeof (mtget); 191 (void)sprintf(resp, "A%d\n", rval); 192 (void)write(STDOUT_FILENO, resp, strlen(resp)); 193 (void)write(STDOUT_FILENO, (char *)&mtget, 194 sizeof (mtget)); 195 goto top; 196 } 197 198 default: 199 DEBUG1("rmtd: garbage command %c\n", c); 200 exit(3); 201 } 202 respond: 203 DEBUG1("rmtd: A %d\n", rval); 204 (void)sprintf(resp, "A%d\n", rval); 205 (void)write(STDOUT_FILENO, resp, strlen(resp)); 206 goto top; 207 ioerror: 208 error(errno); 209 goto top; 210 } 211 212 void 213 getstring(bp) 214 char *bp; 215 { 216 int i; 217 char *cp = bp; 218 219 for (i = 0; i < SSIZE - 1; i++) { 220 if (read(STDIN_FILENO, cp+i, 1) != 1) 221 exit(0); 222 if (cp[i] == '\n') 223 break; 224 } 225 cp[i] = '\0'; 226 } 227 228 char * 229 checkbuf(record, size) 230 char *record; 231 int size; 232 { 233 234 if (size <= maxrecsize) 235 return (record); 236 if (record != 0) 237 free(record); 238 record = malloc(size); 239 if (record == 0) { 240 DEBUG("rmtd: cannot allocate buffer space\n"); 241 exit(4); 242 } 243 maxrecsize = size; 244 while (size > 1024 && 245 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 246 size -= 1024; 247 return (record); 248 } 249 250 void 251 error(num) 252 int num; 253 { 254 255 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 256 (void)sprintf(resp, "E%d\n%s\n", num, strerror(num)); 257 (void)write(STDOUT_FILENO, resp, strlen(resp)); 258 } 259
Indexes created Thu Sep 25 16:09:42 GMT 2025