1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. 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 #if 0 34 static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93"; 35 #endif 36 #endif /* not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/capsicum.h> 42 #include <sys/conf.h> 43 #include <sys/ioctl.h> 44 #include <sys/stat.h> 45 46 #include <capsicum_helpers.h> 47 #include <ctype.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 #include "hexdump.h" 55 56 enum _vflag vflag = FIRST; 57 58 static off_t address; /* address/offset in stream */ 59 static off_t eaddress; /* end address */ 60 61 static void print(PR *, u_char *); 62 static void noseek(void); 63 64 void 65 display(void) 66 { 67 FS *fs; 68 FU *fu; 69 PR *pr; 70 int cnt; 71 u_char *bp; 72 off_t saveaddress; 73 u_char savech, *savebp; 74 75 savech = 0; 76 while ((bp = get())) 77 for (fs = fshead, savebp = bp, saveaddress = address; fs; 78 fs = fs->nextfs, bp = savebp, address = saveaddress) 79 for (fu = fs->nextfu; fu; fu = fu->nextfu) { 80 if (fu->flags&F_IGNORE) 81 break; 82 for (cnt = fu->reps; cnt; --cnt) 83 for (pr = fu->nextpr; pr; address += pr->bcnt, 84 bp += pr->bcnt, pr = pr->nextpr) { 85 if (eaddress && address >= eaddress && 86 !(pr->flags & (F_TEXT|F_BPAD))) 87 bpad(pr); 88 if (cnt == 1 && pr->nospace) { 89 savech = *pr->nospace; 90 *pr->nospace = '\0'; 91 } 92 print(pr, bp); 93 if (cnt == 1 && pr->nospace) 94 *pr->nospace = savech; 95 } 96 } 97 if (endfu) { 98 /* 99 * If eaddress not set, error or file size was multiple of 100 * blocksize, and no partial block ever found. 101 */ 102 if (!eaddress) { 103 if (!address) 104 return; 105 eaddress = address; 106 } 107 for (pr = endfu->nextpr; pr; pr = pr->nextpr) 108 switch(pr->flags) { 109 case F_ADDRESS: 110 (void)printf(pr->fmt, (quad_t)eaddress); 111 break; 112 case F_TEXT: 113 (void)printf("%s", pr->fmt); 114 break; 115 } 116 } 117 } 118 119 static void 120 print(PR *pr, u_char *bp) 121 { 122 long double ldbl; 123 double f8; 124 float f4; 125 int16_t s2; 126 int32_t s4; 127 int64_t s8; 128 u_int16_t u2; 129 u_int32_t u4; 130 u_int64_t u8; 131 132 switch(pr->flags) { 133 case F_ADDRESS: 134 (void)printf(pr->fmt, (quad_t)address); 135 break; 136 case F_BPAD: 137 (void)printf(pr->fmt, ""); 138 break; 139 case F_C: 140 conv_c(pr, bp, eaddress ? eaddress - address : 141 blocksize - address % blocksize); 142 break; 143 case F_CHAR: 144 (void)printf(pr->fmt, *bp); 145 break; 146 case F_DBL: 147 switch(pr->bcnt) { 148 case 4: 149 bcopy(bp, &f4, sizeof(f4)); 150 (void)printf(pr->fmt, f4); 151 break; 152 case 8: 153 bcopy(bp, &f8, sizeof(f8)); 154 (void)printf(pr->fmt, f8); 155 break; 156 default: 157 if (pr->bcnt == sizeof(long double)) { 158 bcopy(bp, &ldbl, sizeof(ldbl)); 159 (void)printf(pr->fmt, ldbl); 160 } 161 break; 162 } 163 break; 164 case F_INT: 165 switch(pr->bcnt) { 166 case 1: 167 (void)printf(pr->fmt, (quad_t)(signed char)*bp); 168 break; 169 case 2: 170 bcopy(bp, &s2, sizeof(s2)); 171 (void)printf(pr->fmt, (quad_t)s2); 172 break; 173 case 4: 174 bcopy(bp, &s4, sizeof(s4)); 175 (void)printf(pr->fmt, (quad_t)s4); 176 break; 177 case 8: 178 bcopy(bp, &s8, sizeof(s8)); 179 (void)printf(pr->fmt, s8); 180 break; 181 } 182 break; 183 case F_P: 184 (void)printf(pr->fmt, isprint(*bp) ? *bp : '.'); 185 break; 186 case F_STR: 187 (void)printf(pr->fmt, (char *)bp); 188 break; 189 case F_TEXT: 190 (void)printf("%s", pr->fmt); 191 break; 192 case F_U: 193 conv_u(pr, bp); 194 break; 195 case F_UINT: 196 switch(pr->bcnt) { 197 case 1: 198 (void)printf(pr->fmt, (u_quad_t)*bp); 199 break; 200 case 2: 201 bcopy(bp, &u2, sizeof(u2)); 202 (void)printf(pr->fmt, (u_quad_t)u2); 203 break; 204 case 4: 205 bcopy(bp, &u4, sizeof(u4)); 206 (void)printf(pr->fmt, (u_quad_t)u4); 207 break; 208 case 8: 209 bcopy(bp, &u8, sizeof(u8)); 210 (void)printf(pr->fmt, u8); 211 break; 212 } 213 break; 214 } 215 } 216 217 void 218 bpad(PR *pr) 219 { 220 static char const *spec = " -0+#"; 221 char *p1, *p2; 222 223 /* 224 * Remove all conversion flags; '-' is the only one valid 225 * with %s, and it's not useful here. 226 */ 227 pr->flags = F_BPAD; 228 pr->cchar[0] = 's'; 229 pr->cchar[1] = '\0'; 230 for (p1 = pr->fmt; *p1 != '%'; ++p1); 231 for (p2 = ++p1; *p1 && strchr(spec, *p1); ++p1); 232 while ((*p2++ = *p1++)); 233 } 234 235 static char **_argv; 236 237 u_char * 238 get(void) 239 { 240 static int ateof = 1; 241 static u_char *curp, *savp; 242 int n; 243 int need, nread; 244 int valid_save = 0; 245 u_char *tmpp; 246 247 if (!curp) { 248 if ((curp = calloc(1, blocksize)) == NULL) 249 err(1, NULL); 250 if ((savp = calloc(1, blocksize)) == NULL) 251 err(1, NULL); 252 } else { 253 tmpp = curp; 254 curp = savp; 255 savp = tmpp; 256 address += blocksize; 257 valid_save = 1; 258 } 259 for (need = blocksize, nread = 0;;) { 260 /* 261 * if read the right number of bytes, or at EOF for one file, 262 * and no other files are available, zero-pad the rest of the 263 * block and set the end flag. 264 */ 265 if (!length || (ateof && !next((char **)NULL))) { 266 if (odmode && skip > 0) 267 errx(1, "cannot skip past end of input"); 268 if (need == blocksize) 269 return((u_char *)NULL); 270 /* 271 * XXX bcmp() is not quite right in the presence 272 * of multibyte characters. 273 */ 274 if (need == 0 && vflag != ALL && 275 valid_save && 276 bcmp(curp, savp, nread) == 0) { 277 if (vflag != DUP) { 278 (void)printf("*\n"); 279 (void)fflush(stdout); 280 } 281 return((u_char *)NULL); 282 } 283 bzero((char *)curp + nread, need); 284 eaddress = address + nread; 285 return(curp); 286 } 287 n = fread((char *)curp + nread, sizeof(u_char), 288 length == -1 ? need : MIN(length, need), stdin); 289 if (!n) { 290 if (ferror(stdin)) 291 warn("%s", _argv[-1]); 292 ateof = 1; 293 continue; 294 } 295 ateof = 0; 296 if (length != -1) 297 length -= n; 298 if (!(need -= n)) { 299 /* 300 * XXX bcmp() is not quite right in the presence 301 * of multibyte characters. 302 */ 303 if (vflag == ALL || vflag == FIRST || 304 valid_save == 0 || 305 bcmp(curp, savp, blocksize) != 0) { 306 if (vflag == DUP || vflag == FIRST) 307 vflag = WAIT; 308 return(curp); 309 } 310 if (vflag == WAIT) { 311 (void)printf("*\n"); 312 (void)fflush(stdout); 313 } 314 vflag = DUP; 315 address += blocksize; 316 need = blocksize; 317 nread = 0; 318 } 319 else 320 nread += n; 321 } 322 } 323 324 size_t 325 peek(u_char *buf, size_t nbytes) 326 { 327 size_t n, nread; 328 int c; 329 330 if (length != -1 && nbytes > (unsigned int)length) 331 nbytes = length; 332 nread = 0; 333 while (nread < nbytes && (c = getchar()) != EOF) { 334 *buf++ = c; 335 nread++; 336 } 337 n = nread; 338 while (n-- > 0) { 339 c = *--buf; 340 ungetc(c, stdin); 341 } 342 return (nread); 343 } 344 345 int 346 next(char **argv) 347 { 348 static int done; 349 int statok; 350 351 if (argv) { 352 _argv = argv; 353 return(1); 354 } 355 for (;;) { 356 if (*_argv) { 357 done = 1; 358 if (!(freopen(*_argv, "r", stdin))) { 359 warn("%s", *_argv); 360 exitval = 1; 361 ++_argv; 362 continue; 363 } 364 statok = 1; 365 } else { 366 if (done++) 367 return(0); 368 statok = 0; 369 } 370 371 if (caph_limit_stream(fileno(stdin), CAPH_READ) < 0) 372 err(1, "unable to restrict %s", 373 statok ? *_argv : "stdin"); 374 375 /* 376 * We've opened our last input file; enter capsicum sandbox. 377 */ 378 if (statok == 0 || *(_argv + 1) == NULL) { 379 if (caph_enter() < 0) 380 err(1, "unable to enter capability mode"); 381 } 382 383 if (skip) 384 doskip(statok ? *_argv : "stdin", statok); 385 if (*_argv) 386 ++_argv; 387 if (!skip) 388 return(1); 389 } 390 /* NOTREACHED */ 391 } 392 393 void 394 doskip(const char *fname, int statok) 395 { 396 int type; 397 struct stat sb; 398 399 if (statok) { 400 if (fstat(fileno(stdin), &sb)) 401 err(1, "%s", fname); 402 if (S_ISREG(sb.st_mode) && skip > sb.st_size) { 403 address += sb.st_size; 404 skip -= sb.st_size; 405 return; 406 } 407 } 408 if (!statok || S_ISFIFO(sb.st_mode) || S_ISSOCK(sb.st_mode)) { 409 noseek(); 410 return; 411 } 412 if (S_ISCHR(sb.st_mode) || S_ISBLK(sb.st_mode)) { 413 if (ioctl(fileno(stdin), FIODTYPE, &type)) 414 err(1, "%s", fname); 415 /* 416 * Most tape drives don't support seeking, 417 * yet fseek() would succeed. 418 */ 419 if (type & D_TAPE) { 420 noseek(); 421 return; 422 } 423 } 424 if (fseeko(stdin, skip, SEEK_SET)) { 425 noseek(); 426 return; 427 } 428 address += skip; 429 skip = 0; 430 } 431 432 static void 433 noseek(void) 434 { 435 int count; 436 for (count = 0; count < skip; ++count) 437 if (getchar() == EOF) 438 break; 439 address += count; 440 skip -= count; 441 } 442