1 /* $OpenBSD: rmt.c,v 1.12 2005/03/07 16:08:19 henning 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 char copyright[] = 34 "@(#) Copyright (c) 1983 Regents of the University of California.\n\ 35 All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #ifndef lint 39 /*static char sccsid[] = "from: @(#)rmt.c 5.6 (Berkeley) 6/1/90";*/ 40 static char rcsid[] = "$Id: rmt.c,v 1.12 2005/03/07 16:08:19 henning Exp $"; 41 #endif /* not lint */ 42 43 /* 44 * rmt 45 */ 46 #include <stdio.h> 47 #include <sgtty.h> 48 #include <sys/types.h> 49 #include <sys/socket.h> 50 #include <sys/file.h> 51 #include <sys/stat.h> 52 #include <sys/mtio.h> 53 #include <sys/param.h> 54 #include <unistd.h> 55 #include <stdlib.h> 56 #include <errno.h> 57 #include <string.h> 58 59 int tape = -1; 60 61 char *record; 62 int maxrecsize = -1; 63 64 #define STRSIZE 64 65 char device[MAXPATHLEN]; 66 char count[STRSIZE], mode[STRSIZE], pos[STRSIZE], op[STRSIZE]; 67 68 char resp[BUFSIZ]; 69 70 FILE *debug; 71 #define DEBUG(f) if (debug) fprintf(debug, f) 72 #define DEBUG1(f,a) if (debug) fprintf(debug, f, a) 73 #define DEBUG2(f,a1,a2) if (debug) fprintf(debug, f, a1, a2) 74 75 char *checkbuf(char *, int); 76 void getstring(char *, int); 77 void error(int); 78 79 int 80 main(int argc, char *argv[]) 81 { 82 off_t orval; 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(STDIN_FILENO, &c, 1) != 1) 98 exit(0); 99 switch (c) { 100 101 case 'O': 102 if (tape >= 0) 103 (void) close(tape); 104 getstring(device, sizeof(device)); 105 getstring(mode, sizeof(mode)); 106 DEBUG2("rmtd: O %s %s\n", device, mode); 107 tape = open(device, atoi(mode), 108 S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); 109 if (tape == -1) 110 goto ioerror; 111 goto respond; 112 113 case 'C': 114 DEBUG("rmtd: C\n"); 115 getstring(device, sizeof(device)); /* discard */ 116 if (close(tape) == -1) 117 goto ioerror; 118 tape = -1; 119 goto respond; 120 121 case 'L': 122 getstring(count, sizeof(count)); 123 getstring(pos, sizeof(pos)); 124 DEBUG2("rmtd: L %s %s\n", count, pos); 125 orval = lseek(tape, strtoq(count, NULL, 0), atoi(pos)); 126 if (orval == -1) 127 goto ioerror; 128 goto respond; 129 130 case 'W': 131 getstring(count, sizeof(count)); 132 n = atoi(count); 133 DEBUG1("rmtd: W %s\n", count); 134 record = checkbuf(record, n); 135 for (i = 0; i < n; i += cc) { 136 cc = read(STDIN_FILENO, &record[i], n - i); 137 if (cc <= 0) { 138 DEBUG("rmtd: premature eof\n"); 139 exit(2); 140 } 141 } 142 rval = write(tape, record, n); 143 if (rval < 0) 144 goto ioerror; 145 goto respond; 146 147 case 'R': 148 getstring(count, sizeof(count)); 149 DEBUG1("rmtd: R %s\n", count); 150 n = atoi(count); 151 record = checkbuf(record, n); 152 rval = read(tape, record, n); 153 if (rval < 0) 154 goto ioerror; 155 (void) snprintf(resp, sizeof resp, "A%d\n", rval); 156 (void) write(STDOUT_FILENO, resp, strlen(resp)); 157 (void) write(STDOUT_FILENO, record, rval); 158 goto top; 159 160 case 'I': 161 getstring(op, sizeof(op)); 162 getstring(count, sizeof(count)); 163 DEBUG2("rmtd: I %s %s\n", op, count); 164 { struct mtop mtop; 165 mtop.mt_op = atoi(op); 166 mtop.mt_count = atoi(count); 167 if (ioctl(tape, MTIOCTOP, (char *)&mtop) == -1) 168 goto ioerror; 169 rval = mtop.mt_count; 170 } 171 goto respond; 172 173 case 'S': /* status */ 174 DEBUG("rmtd: S\n"); 175 { struct mtget mtget; 176 if (ioctl(tape, MTIOCGET, (char *)&mtget) == -1) 177 goto ioerror; 178 rval = sizeof (mtget); 179 (void) snprintf(resp, sizeof resp, "A%d\n", rval); 180 (void) write(STDOUT_FILENO, resp, strlen(resp)); 181 (void) write(STDOUT_FILENO, (char *)&mtget, sizeof (mtget)); 182 goto top; 183 } 184 185 default: 186 DEBUG1("rmtd: garbage command %c\n", c); 187 exit(3); 188 } 189 respond: 190 DEBUG1("rmtd: A %d\n", rval); 191 (void) snprintf(resp, sizeof resp, "A%d\n", rval); 192 (void) write(STDOUT_FILENO, resp, strlen(resp)); 193 goto top; 194 ioerror: 195 error(errno); 196 goto top; 197 } 198 199 void 200 getstring(char *bp, int size) 201 { 202 char *cp = bp; 203 char *ep = bp + size - 1; 204 205 do { 206 if (read(STDIN_FILENO, cp, 1) != 1) 207 exit(0); 208 } while (*cp != '\n' && ++cp < ep); 209 *cp = '\0'; 210 } 211 212 char * 213 checkbuf(char *record, int size) 214 { 215 if (size <= maxrecsize) 216 return (record); 217 if (record != 0) 218 free(record); 219 record = malloc(size); 220 if (record == 0) { 221 DEBUG("rmtd: cannot allocate buffer space\n"); 222 exit(4); 223 } 224 maxrecsize = size; 225 while (size > 1024 && 226 setsockopt(0, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)) == -1) 227 size -= 1024; 228 return (record); 229 } 230 231 void 232 error(int num) 233 { 234 235 DEBUG2("rmtd: E %d (%s)\n", num, strerror(num)); 236 (void) snprintf(resp, sizeof (resp), "E%d\n%s\n", num, strerror(num)); 237 (void) write(STDOUT_FILENO, resp, strlen(resp)); 238 } 239