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 35 static 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 static char sccsid[] = "@(#)rmt.c 8.1 (Berkeley) 6/6/93"; 42 #endif /* not lint */ 43 44 /* 45 * rmt 46 */ 47 #include <sys/types.h> 48 #include <sys/socket.h> 49 #include <sys/mtio.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <sgtty.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 int tape = -1; 59 60 char *record; 61 int maxrecsize = -1; 62 63 #define SSIZE 64 64 char device[SSIZE]; 65 char count[SSIZE], mode[SSIZE], pos[SSIZE], op[SSIZE]; 66 67 char resp[BUFSIZ]; 68 69 FILE *debug; 70 #define DEBUG(f) if (debug) fprintf(debug, f) 71 #define DEBUG1(f,a) if (debug) fprintf(debug, f, a) 72 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) 73 74 char *checkbuf __P((char *, int)); 75 void error __P((int)); 76 void getstring __P((char *)); 77 78 int 79 main(argc, argv) 80 int argc; 81 char **argv; 82 { 83 int rval; 84 char c; 85 int n, i, cc; 86 87 argc--, argv++; 88 if (argc > 0) { 89 debug = fopen(*argv, "w"); 90 if (debug == 0) 91 exit(1); 92 (void)setbuf(debug, (char *)0); 93 } 94 top: 95 errno = 0; 96 rval = 0; 97 if (read(0, &c, 1) != 1) 98 exit(0); 99 switch (c) { 100 101 case 'O': 102 if (tape >= 0) 103 (void) close(tape); 104 getstring(device); 105 getstring(mode); 106 DEBUG2("rmtd: O %s %s\n", device, mode); 107 /* 108 * XXX the rmt protocol does not provide a means to 109 * specify the permission bits; allow rw for everyone, 110 * as modified by the users umask 111 */ 112 tape = open(device, atoi(mode), 0666); 113 if (tape < 0) 114 goto ioerror; 115 goto respond; 116 117 case 'C': 118 DEBUG("rmtd: C\n"); 119 getstring(device); /* discard */ 120 if (close(tape) < 0) 121 goto ioerror; 122 tape = -1; 123 goto respond; 124 125 case 'L': 126 getstring(count); 127 getstring(pos); 128 DEBUG2("rmtd: L %s %s\n", count, pos); 129 rval = lseek(tape, (off_t)atol(count), atoi(pos)); 130 if (rval < 0) 131 goto ioerror; 132 goto respond; 133 134 case 'W': 135 getstring(count); 136 n = atoi(count); 137 DEBUG1("rmtd: W %s\n", count); 138 record = checkbuf(record, n); 139 for (i = 0; i < n; i += cc) { 140 cc = read(0, &record[i], n - i); 141 if (cc <= 0) { 142 DEBUG("rmtd: premature eof\n"); 143 exit(2); 144 } 145 } 146 rval = write(tape, record, n); 147 if (rval < 0) 148 goto ioerror; 149 goto respond; 150 151 case 'R': 152 getstring(count); 153 DEBUG1("rmtd: R %s\n", count); 154 n = atoi(count); 155 record = checkbuf(record, n); 156 rval = read(tape, record, n); 157 if (rval < 0) 158 goto ioerror; 159 (void)sprintf(resp, "A%d\n", rval); 160 (void)write(1, resp, strlen(resp)); 161 (void)write(1, record, rval); 162 goto top; 163 164 case 'I': 165 getstring(op); 166 getstring(count); 167 DEBUG2("rmtd: I %s %s\n", op, count); 168 { struct mtop mtop; 169 mtop.mt_op = atoi(op); 170 mtop.mt_count = atoi(count); 171 if (ioctl(tape, MTIOCTOP, (char *)&mtop) < 0) 172 goto ioerror; 173 rval = mtop.mt_count; 174 } 175 goto respond; 176 177 case 'S': /* status */ 178 DEBUG("rmtd: S\n"); 179 { struct mtget mtget; 180 if (ioctl(tape, MTIOCGET, (char *)&mtget) < 0) 181 goto ioerror; 182 rval = sizeof (mtget); 183 (void)sprintf(resp, "A%d\n", rval); 184 (void)write(1, resp, strlen(resp)); 185 (void)write(1, (char *)&mtget, sizeof (mtget)); 186 goto top; 187 } 188 189 default: 190 DEBUG1("rmtd: garbage command %c\n", c); 191 exit(3); 192 } 193 respond: 194 DEBUG1("rmtd: A %d\n", rval); 195 (void)sprintf(resp, "A%d\n", rval); 196 (void)write(1, resp, strlen(resp)); 197 goto top; 198 ioerror: 199 error(errno); 200 goto top; 201 } 202 203 void 204 getstring(bp) 205 char *bp; 206 { 207 int i; 208 char *cp = bp; 209 210 for (i = 0; i < SSIZE; i++) { 211 if (read(0, cp+i, 1) != 1) 212 exit(0); 213 if (cp[i] == '\n') 214 break; 215 } 216 cp[i] = '\0'; 217 } 218 219 char * 220 checkbuf(record, size) 221 char *record; 222 int size; 223 { 224 225 if (size <= maxrecsize) 226 return (record); 227 if (record != 0) 228 free(record); 229 record = malloc(size); 230 if (record == 0) { 231 DEBUG("rmtd: cannot allocate buffer space\n"); 232 exit(4); 233 } 234 maxrecsize = size; 235 while (size > 1024 && 236 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) < 0) 237 size -= 1024; 238 return (record); 239 } 240 241 void 242 error(num) 243 int num; 244 { 245 246 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 247 (void)snprintf(resp, sizeof(resp), "E%d\n%s\n", num, strerror(num)); 248 (void)write(1, resp, strlen(resp)); 249 } 250