rmt.c revision 83096
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#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1983, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)rmt.c 8.1 (Berkeley) 6/6/93"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/usr.sbin/rmt/rmt.c 83096 2001-09-05 17:05:31Z ache $"; 46#endif /* not lint */ 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 __P((char *, int)); 79void error __P((int)); 80void getstring __P((char *)); 81 82int 83main(argc, argv) 84 int argc; 85 char **argv; 86{ 87 int rval; 88 char c; 89 int n, i, cc; 90 91 argc--, argv++; 92 if (argc > 0) { 93 debug = fopen(*argv, "w"); 94 if (debug == 0) 95 exit(1); 96 (void)setbuf(debug, (char *)0); 97 } 98top: 99 errno = 0; 100 rval = 0; 101 if (read(STDIN_FILENO, &c, 1) != 1) 102 exit(0); 103 switch (c) { 104 105 case 'O': 106 if (tape >= 0) 107 (void) close(tape); 108 getstring(device); 109 getstring(mode); 110 DEBUG2("rmtd: O %s %s\n", device, mode); 111 /* 112 * XXX the rmt protocol does not provide a means to 113 * specify the permission bits; allow rw for everyone, 114 * as modified by the users umask 115 */ 116 tape = open(device, atoi(mode), 0666); 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)strtoll(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 { struct mtop mtop; 173 mtop.mt_op = atoi(op); 174 mtop.mt_count = atoi(count); 175 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 176 goto ioerror; 177 rval = mtop.mt_count; 178 } 179 goto respond; 180 181 case 'S': /* status */ 182 DEBUG("rmtd: S\n"); 183 { struct mtget mtget; 184 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 185 goto ioerror; 186 rval = sizeof (mtget); 187 if (rval > 24) /* original mtget structure size */ 188 rval = 24; 189 (void)sprintf(resp, "A%d\n", rval); 190 (void)write(STDOUT_FILENO, resp, strlen(resp)); 191 (void)write(STDOUT_FILENO, (char *)&mtget, rval); 192 goto top; 193 } 194 195 case 'V': /* version */ 196 getstring(op); 197 DEBUG1("rmtd: V %s\n", op); 198 rval = 2; 199 goto respond; 200 201 default: 202 DEBUG1("rmtd: garbage command %c\n", c); 203 exit(3); 204 } 205respond: 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; 210ioerror: 211 error(errno); 212 goto top; 213} 214 215void 216getstring(bp) 217 char *bp; 218{ 219 int i; 220 char *cp = bp; 221 222 for (i = 0; i < SSIZE; i++) { 223 if (read(STDIN_FILENO, cp+i, 1) != 1) 224 exit(0); 225 if (cp[i] == '\n') 226 break; 227 } 228 cp[i] = '\0'; 229} 230 231char * 232checkbuf(record, size) 233 char *record; 234 int size; 235{ 236 237 if (size <= maxrecsize) 238 return (record); 239 if (record != 0) 240 free(record); 241 record = malloc(size); 242 if (record == 0) { 243 DEBUG("rmtd: cannot allocate buffer space\n"); 244 exit(4); 245 } 246 maxrecsize = size; 247 while (size > 1024 && 248 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 249 size -= 1024; 250 return (record); 251} 252 253void 254error(num) 255 int num; 256{ 257 258 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 259 (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num)); 260 (void)write(STDOUT_FILENO, resp, strlen(resp)); 261} 262