1 /* $OpenBSD: rmt.c,v 1.6 2000/07/20 01:41:13 jason Exp $ */ 2 3 /* 4 * Copyright (c) 1983 Regents of the University of California. 5 * 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 char copyright[] = 38 "@(#) Copyright (c) 1983 Regents of the University of California.\n\ 39 All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 /*static char sccsid[] = "from: @(#)rmt.c 5.6 (Berkeley) 6/1/90";*/ 44 static char rcsid[] = "$Id: rmt.c,v 1.6 2000/07/20 01:41:13 jason Exp $"; 45 #endif /* not lint */ 46 47 /* 48 * rmt 49 */ 50 #include <stdio.h> 51 #include <sgtty.h> 52 #include <sys/types.h> 53 #include <sys/socket.h> 54 #include <sys/file.h> 55 #include <sys/stat.h> 56 #include <sys/mtio.h> 57 #include <unistd.h> 58 #include <stdlib.h> 59 #include <errno.h> 60 #include <string.h> 61 62 int tape = -1; 63 64 char *record; 65 int maxrecsize = -1; 66 67 #define STRSIZE 64 68 char device[STRSIZE]; 69 char count[STRSIZE], mode[STRSIZE], pos[STRSIZE], op[STRSIZE]; 70 71 char resp[BUFSIZ]; 72 73 FILE *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 78 char *checkbuf __P((char *, int)); 79 void getstring __P((char *)); 80 void error __P((int)); 81 82 int 83 main(argc, argv) 84 int argc; 85 char **argv; 86 { 87 off_t orval; 88 int rval; 89 char c; 90 int n, i, cc; 91 92 argc--, argv++; 93 if (argc > 0) { 94 debug = fopen(*argv, "w"); 95 if (debug == 0) 96 exit(1); 97 (void) setbuf(debug, (char *)0); 98 } 99 top: 100 errno = 0; 101 rval = 0; 102 if (read(0, &c, 1) != 1) 103 exit(0); 104 switch (c) { 105 106 case 'O': 107 if (tape >= 0) 108 (void) close(tape); 109 getstring(device); getstring(mode); 110 DEBUG2("rmtd: O %s %s\n", device, mode); 111 tape = open(device, atoi(mode), 112 S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); 113 if (tape == -1) 114 goto ioerror; 115 goto respond; 116 117 case 'C': 118 DEBUG("rmtd: C\n"); 119 getstring(device); /* discard */ 120 if (close(tape) == -1) 121 goto ioerror; 122 tape = -1; 123 goto respond; 124 125 case 'L': 126 getstring(count); getstring(pos); 127 DEBUG2("rmtd: L %s %s\n", count, pos); 128 orval = lseek(tape, strtoq(count, NULL, 0), atoi(pos)); 129 if (orval == -1) 130 goto ioerror; 131 goto respond; 132 133 case 'W': 134 getstring(count); 135 n = atoi(count); 136 DEBUG1("rmtd: W %s\n", count); 137 record = checkbuf(record, n); 138 for (i = 0; i < n; i += cc) { 139 cc = read(0, &record[i], n - i); 140 if (cc <= 0) { 141 DEBUG("rmtd: premature eof\n"); 142 exit(2); 143 } 144 } 145 rval = write(tape, record, n); 146 if (rval < 0) 147 goto ioerror; 148 goto respond; 149 150 case 'R': 151 getstring(count); 152 DEBUG1("rmtd: R %s\n", count); 153 n = atoi(count); 154 record = checkbuf(record, n); 155 rval = read(tape, record, n); 156 if (rval < 0) 157 goto ioerror; 158 (void) sprintf(resp, "A%d\n", rval); 159 (void) write(1, resp, strlen(resp)); 160 (void) write(1, record, rval); 161 goto top; 162 163 case 'I': 164 getstring(op); getstring(count); 165 DEBUG2("rmtd: I %s %s\n", op, count); 166 { struct mtop mtop; 167 mtop.mt_op = atoi(op); 168 mtop.mt_count = atoi(count); 169 if (ioctl(tape, MTIOCTOP, (char *)&mtop) == -1) 170 goto ioerror; 171 rval = mtop.mt_count; 172 } 173 goto respond; 174 175 case 'S': /* status */ 176 DEBUG("rmtd: S\n"); 177 { struct mtget mtget; 178 if (ioctl(tape, MTIOCGET, (char *)&mtget) == -1) 179 goto ioerror; 180 rval = sizeof (mtget); 181 (void) sprintf(resp, "A%d\n", rval); 182 (void) write(1, resp, strlen(resp)); 183 (void) write(1, (char *)&mtget, sizeof (mtget)); 184 goto top; 185 } 186 187 default: 188 DEBUG1("rmtd: garbage command %c\n", c); 189 exit(3); 190 } 191 respond: 192 DEBUG1("rmtd: A %d\n", rval); 193 (void) sprintf(resp, "A%d\n", rval); 194 (void) write(1, resp, strlen(resp)); 195 goto top; 196 ioerror: 197 error(errno); 198 goto top; 199 } 200 201 void 202 getstring(bp) 203 char *bp; 204 { 205 int i; 206 char *cp = bp; 207 208 for (i = 0; i < STRSIZE; i++) { 209 if (read(0, cp+i, 1) != 1) 210 exit(0); 211 if (cp[i] == '\n') 212 break; 213 } 214 cp[i] = '\0'; 215 } 216 217 char * 218 checkbuf(record, size) 219 char *record; 220 int size; 221 { 222 if (size <= maxrecsize) 223 return (record); 224 if (record != 0) 225 free(record); 226 record = malloc(size); 227 if (record == 0) { 228 DEBUG("rmtd: cannot allocate buffer space\n"); 229 exit(4); 230 } 231 maxrecsize = size; 232 while (size > 1024 && 233 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) == -1) 234 size -= 1024; 235 return (record); 236 } 237 238 void 239 error(num) 240 int num; 241 { 242 243 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 244 (void) snprintf(resp, sizeof (resp), "E%d\n%s\n", num, strerror(num)); 245 (void) write(1, resp, strlen(resp)); 246 } 247