rmt.c revision 114601
1/* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#if 0 35#ifndef lint 36static const char copyright[] = 37"@(#) Copyright (c) 1983, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39#endif /* not lint */ 40 41#ifndef lint 42static char sccsid[] = "@(#)rmt.c 8.1 (Berkeley) 6/6/93"; 43#endif /* not lint */ 44#endif 45#include <sys/cdefs.h> 46__FBSDID("$FreeBSD: head/usr.sbin/rmt/rmt.c 114601 2003-05-03 21:06:42Z obrien $"); 47 48/* 49 * rmt 50 */ 51#include <sys/types.h> 52#include <sys/socket.h> 53#include <sys/mtio.h> 54#include <errno.h> 55#include <fcntl.h> 56#include <sgtty.h> 57#include <stdio.h> 58#include <stdlib.h> 59#include <string.h> 60#include <unistd.h> 61 62int tape = -1; 63 64char *record; 65int maxrecsize = -1; 66 67#define SSIZE 64 68char device[SSIZE]; 69char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE]; 70 71char resp[BUFSIZ]; 72 73FILE *debug; 74#define DEBUG(f) if (debug) fprintf(debug, f) 75#define DEBUG1(f,a) if (debug) fprintf(debug, f, a) 76#define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) 77 78char *checkbuf(char *, int); 79void error(int); 80void getstring(char *); 81 82int 83main(int argc, char **argv) 84{ 85 int rval; 86 char c; 87 int n, i, cc; 88 89 argc--, argv++; 90 if (argc > 0) { 91 debug = fopen(*argv, "w"); 92 if (debug == 0) 93 exit(1); 94 (void)setbuf(debug, (char *)0); 95 } 96top: 97 errno = 0; 98 rval = 0; 99 if (read(STDIN_FILENO, &c, 1) != 1) 100 exit(0); 101 switch (c) { 102 103 case 'O': 104 if (tape >= 0) 105 (void) close(tape); 106 getstring(device); 107 getstring(mode); 108 DEBUG2("rmtd: O %s %s\n", device, mode); 109 /* 110 * XXX the rmt protocol does not provide a means to 111 * specify the permission bits; allow rw for everyone, 112 * as modified by the users umask 113 */ 114 tape = open(device, atoi(mode), 0666); 115 if (tape < 0) 116 goto ioerror; 117 goto respond; 118 119 case 'C': 120 DEBUG("rmtd: C\n"); 121 getstring(device); /* discard */ 122 if (close(tape) < 0) 123 goto ioerror; 124 tape = -1; 125 goto respond; 126 127 case 'L': 128 getstring(count); 129 getstring(pos); 130 DEBUG2("rmtd: L %s %s\n", count, pos); 131 rval = lseek(tape, (off_t)strtoll(count, NULL, 10), atoi(pos)); 132 if (rval < 0) 133 goto ioerror; 134 goto respond; 135 136 case 'W': 137 getstring(count); 138 n = atoi(count); 139 DEBUG1("rmtd: W %s\n", count); 140 record = checkbuf(record, n); 141 for (i = 0; i < n; i += cc) { 142 cc = read(STDIN_FILENO, &record[i], n - i); 143 if (cc <= 0) { 144 DEBUG("rmtd: premature eof\n"); 145 exit(2); 146 } 147 } 148 rval = write(tape, record, n); 149 if (rval < 0) 150 goto ioerror; 151 goto respond; 152 153 case 'R': 154 getstring(count); 155 DEBUG1("rmtd: R %s\n", count); 156 n = atoi(count); 157 record = checkbuf(record, n); 158 rval = read(tape, record, n); 159 if (rval < 0) 160 goto ioerror; 161 (void)sprintf(resp, "A%d\n", rval); 162 (void)write(STDOUT_FILENO, resp, strlen(resp)); 163 (void)write(STDOUT_FILENO, record, rval); 164 goto top; 165 166 case 'I': 167 getstring(op); 168 getstring(count); 169 DEBUG2("rmtd: I %s %s\n", op, count); 170 { struct mtop mtop; 171 mtop.mt_op = atoi(op); 172 mtop.mt_count = atoi(count); 173 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 174 goto ioerror; 175 rval = mtop.mt_count; 176 } 177 goto respond; 178 179 case 'S': /* status */ 180 DEBUG("rmtd: S\n"); 181 { struct mtget mtget; 182 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 183 goto ioerror; 184 rval = sizeof (mtget); 185 if (rval > 24) /* original mtget structure size */ 186 rval = 24; 187 (void)sprintf(resp, "A%d\n", rval); 188 (void)write(STDOUT_FILENO, resp, strlen(resp)); 189 (void)write(STDOUT_FILENO, (char *)&mtget, rval); 190 goto top; 191 } 192 193 case 'V': /* version */ 194 getstring(op); 195 DEBUG1("rmtd: V %s\n", op); 196 rval = 2; 197 goto respond; 198 199 default: 200 DEBUG1("rmtd: garbage command %c\n", c); 201 exit(3); 202 } 203respond: 204 DEBUG1("rmtd: A %d\n", rval); 205 (void)sprintf(resp, "A%d\n", rval); 206 (void)write(STDOUT_FILENO, resp, strlen(resp)); 207 goto top; 208ioerror: 209 error(errno); 210 goto top; 211} 212 213void 214getstring(bp) 215 char *bp; 216{ 217 int i; 218 char *cp = bp; 219 220 for (i = 0; i < SSIZE; i++) { 221 if (read(STDIN_FILENO, cp+i, 1) != 1) 222 exit(0); 223 if (cp[i] == '\n') 224 break; 225 } 226 cp[i] = '\0'; 227} 228 229char * 230checkbuf(rec, size) 231 char *rec; 232 int size; 233{ 234 235 if (size <= maxrecsize) 236 return (rec); 237 if (rec != 0) 238 free(rec); 239 rec = malloc(size); 240 if (rec == 0) { 241 DEBUG("rmtd: cannot allocate buffer space\n"); 242 exit(4); 243 } 244 maxrecsize = size; 245 while (size > 1024 && 246 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 247 size -= 1024; 248 return (rec); 249} 250 251void 252error(num) 253 int num; 254{ 255 256 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 257 (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num)); 258 (void)write(STDOUT_FILENO, resp, strlen(resp)); 259} 260