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