1 /* 2 * Copyright (c) 1989, 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. 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 #ifndef lint 31 #if 0 32 static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93"; 33 #endif 34 #endif /* not lint */ 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/capsicum.h> 40 #include <sys/stat.h> 41 42 #include <capsicum_helpers.h> 43 #include <ctype.h> 44 #include <err.h> 45 #include <errno.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include "hexdump.h" 51 52 enum _vflag vflag = FIRST; 53 54 static off_t address; /* address/offset in stream */ 55 static off_t eaddress; /* end address */ 56 57 static void print(PR *, u_char *); 58 59 void 60 display(void) 61 { 62 FS *fs; 63 FU *fu; 64 PR *pr; 65 int cnt; 66 u_char *bp; 67 off_t saveaddress; 68 u_char savech, *savebp; 69 70 savech = 0; 71 while ((bp = get())) 72 for (fs = fshead, savebp = bp, saveaddress = address; fs; 73 fs = fs->nextfs, bp = savebp, address = saveaddress) 74 for (fu = fs->nextfu; fu; fu = fu->nextfu) { 75 if (fu->flags&F_IGNORE) 76 break; 77 for (cnt = fu->reps; cnt; --cnt) 78 for (pr = fu->nextpr; pr; address += pr->bcnt, 79 bp += pr->bcnt, pr = pr->nextpr) { 80 if (eaddress && address >= eaddress && 81 !(pr->flags & (F_TEXT|F_BPAD))) 82 bpad(pr); 83 if (cnt == 1 && pr->nospace) { 84 savech = *pr->nospace; 85 *pr->nospace = '\0'; 86 } 87 print(pr, bp); 88 if (cnt == 1 && pr->nospace) 89 *pr->nospace = savech; 90 } 91 } 92 if (endfu) { 93 /* 94 * If eaddress not set, error or file size was multiple of 95 * blocksize, and no partial block ever found. 96 */ 97 if (!eaddress) { 98 if (!address) 99 return; 100 eaddress = address; 101 } 102 for (pr = endfu->nextpr; pr; pr = pr->nextpr) 103 switch(pr->flags) { 104 case F_ADDRESS: 105 (void)printf(pr->fmt, (quad_t)eaddress); 106 break; 107 case F_TEXT: 108 (void)printf("%s", pr->fmt); 109 break; 110 } 111 } 112 } 113 114 static void 115 print(PR *pr, u_char *bp) 116 { 117 long double ldbl; 118 double f8; 119 float f4; 120 int16_t s2; 121 int8_t s8; 122 int32_t s4; 123 u_int16_t u2; 124 u_int32_t u4; 125 u_int64_t u8; 126 127 switch(pr->flags) { 128 case F_ADDRESS: 129 (void)printf(pr->fmt, (quad_t)address); 130 break; 131 case F_BPAD: 132 (void)printf(pr->fmt, ""); 133 break; 134 case F_C: 135 conv_c(pr, bp, eaddress ? eaddress - address : 136 blocksize - address % blocksize); 137 break; 138 case F_CHAR: 139 (void)printf(pr->fmt, *bp); 140 break; 141 case F_DBL: 142 switch(pr->bcnt) { 143 case 4: 144 bcopy(bp, &f4, sizeof(f4)); 145 (void)printf(pr->fmt, f4); 146 break; 147 case 8: 148 bcopy(bp, &f8, sizeof(f8)); 149 (void)printf(pr->fmt, f8); 150 break; 151 default: 152 if (pr->bcnt == sizeof(long double)) { 153 bcopy(bp, &ldbl, sizeof(ldbl)); 154 (void)printf(pr->fmt, ldbl); 155 } 156 break; 157 } 158 break; 159 case F_INT: 160 switch(pr->bcnt) { 161 case 1: 162 (void)printf(pr->fmt, (quad_t)(signed char)*bp); 163 break; 164 case 2: 165 bcopy(bp, &s2, sizeof(s2)); 166 (void)printf(pr->fmt, (quad_t)s2); 167 break; 168 case 4: 169 bcopy(bp, &s4, sizeof(s4)); 170 (void)printf(pr->fmt, (quad_t)s4); 171 break; 172 case 8: 173 bcopy(bp, &s8, sizeof(s8)); 174 (void)printf(pr->fmt, s8); 175 break; 176 } 177 break; 178 case F_P: 179 (void)printf(pr->fmt, isprint(*bp) ? *bp : '.'); 180 break; 181 case F_STR: 182 (void)printf(pr->fmt, (char *)bp); 183 break; 184 case F_TEXT: 185 (void)printf("%s", pr->fmt); 186 break; 187 case F_U: 188 conv_u(pr, bp); 189 break; 190 case F_UINT: 191 switch(pr->bcnt) { 192 case 1: 193 (void)printf(pr->fmt, (u_quad_t)*bp); 194 break; 195 case 2: 196 bcopy(bp, &u2, sizeof(u2)); 197 (void)printf(pr->fmt, (u_quad_t)u2); 198 break; 199 case 4: 200 bcopy(bp, &u4, sizeof(u4)); 201 (void)printf(pr->fmt, (u_quad_t)u4); 202 break; 203 case 8: 204 bcopy(bp, &u8, sizeof(u8)); 205 (void)printf(pr->fmt, u8); 206 break; 207 } 208 break; 209 } 210 } 211 212 void 213 bpad(PR *pr) 214 { 215 static char const *spec = " -0+#"; 216 char *p1, *p2; 217 218 /* 219 * Remove all conversion flags; '-' is the only one valid 220 * with %s, and it's not useful here. 221 */ 222 pr->flags = F_BPAD; 223 pr->cchar[0] = 's'; 224 pr->cchar[1] = '\0'; 225 for (p1 = pr->fmt; *p1 != '%'; ++p1); 226 for (p2 = ++p1; *p1 && strchr(spec, *p1); ++p1); 227 while ((*p2++ = *p1++)); 228 } 229 230 static char **_argv; 231 232 u_char * 233 get(void) 234 { 235 static int ateof = 1; 236 static u_char *curp, *savp; 237 int n; 238 int need, nread; 239 int valid_save = 0; 240 u_char *tmpp; 241 242 if (!curp) { 243 if ((curp = calloc(1, blocksize)) == NULL) 244 err(1, NULL); 245 if ((savp = calloc(1, blocksize)) == NULL) 246 err(1, NULL); 247 } else { 248 tmpp = curp; 249 curp = savp; 250 savp = tmpp; 251 address += blocksize; 252 valid_save = 1; 253 } 254 for (need = blocksize, nread = 0;;) { 255 /* 256 * if read the right number of bytes, or at EOF for one file, 257 * and no other files are available, zero-pad the rest of the 258 * block and set the end flag. 259 */ 260 if (!length || (ateof && !next((char **)NULL))) { 261 if (odmode && address < skip) 262 errx(1, "cannot skip past end of input"); 263 if (need == blocksize) 264 return((u_char *)NULL); 265 /* 266 * XXX bcmp() is not quite right in the presence 267 * of multibyte characters. 268 */ 269 if (vflag != ALL && 270 valid_save && 271 bcmp(curp, savp, nread) == 0) { 272 if (vflag != DUP) 273 (void)printf("*\n"); 274 return((u_char *)NULL); 275 } 276 bzero((char *)curp + nread, need); 277 eaddress = address + nread; 278 return(curp); 279 } 280 n = fread((char *)curp + nread, sizeof(u_char), 281 length == -1 ? need : MIN(length, need), stdin); 282 if (!n) { 283 if (ferror(stdin)) 284 warn("%s", _argv[-1]); 285 ateof = 1; 286 continue; 287 } 288 ateof = 0; 289 if (length != -1) 290 length -= n; 291 if (!(need -= n)) { 292 /* 293 * XXX bcmp() is not quite right in the presence 294 * of multibyte characters. 295 */ 296 if (vflag == ALL || vflag == FIRST || 297 valid_save == 0 || 298 bcmp(curp, savp, blocksize) != 0) { 299 if (vflag == DUP || vflag == FIRST) 300 vflag = WAIT; 301 return(curp); 302 } 303 if (vflag == WAIT) 304 (void)printf("*\n"); 305 vflag = DUP; 306 address += blocksize; 307 need = blocksize; 308 nread = 0; 309 } 310 else 311 nread += n; 312 } 313 } 314 315 size_t 316 peek(u_char *buf, size_t nbytes) 317 { 318 size_t n, nread; 319 int c; 320 321 if (length != -1 && nbytes > (unsigned int)length) 322 nbytes = length; 323 nread = 0; 324 while (nread < nbytes && (c = getchar()) != EOF) { 325 *buf++ = c; 326 nread++; 327 } 328 n = nread; 329 while (n-- > 0) { 330 c = *--buf; 331 ungetc(c, stdin); 332 } 333 return (nread); 334 } 335 336 int 337 next(char **argv) 338 { 339 static int done; 340 int statok; 341 342 if (argv) { 343 _argv = argv; 344 return(1); 345 } 346 for (;;) { 347 if (*_argv) { 348 done = 1; 349 if (!(freopen(*_argv, "r", stdin))) { 350 warn("%s", *_argv); 351 exitval = 1; 352 ++_argv; 353 continue; 354 } 355 statok = 1; 356 } else { 357 if (done++) 358 return(0); 359 statok = 0; 360 } 361 362 if (caph_limit_stream(fileno(stdin), CAPH_READ) < 0) 363 err(1, "unable to restrict %s", 364 statok ? *_argv : "stdin"); 365 366 /* 367 * We've opened our last input file; enter capsicum sandbox. 368 */ 369 if (statok == 0 || *(_argv + 1) == NULL) { 370 if (cap_enter() < 0 && errno != ENOSYS) 371 err(1, "unable to enter capability mode"); 372 } 373 374 if (skip) 375 doskip(statok ? *_argv : "stdin", statok); 376 if (*_argv) 377 ++_argv; 378 if (!skip) 379 return(1); 380 } 381 /* NOTREACHED */ 382 } 383 384 void 385 doskip(const char *fname, int statok) 386 { 387 int cnt; 388 struct stat sb; 389 390 if (statok) { 391 if (fstat(fileno(stdin), &sb)) 392 err(1, "%s", fname); 393 if (S_ISREG(sb.st_mode) && skip > sb.st_size) { 394 address += sb.st_size; 395 skip -= sb.st_size; 396 return; 397 } 398 } 399 if (statok && S_ISREG(sb.st_mode)) { 400 if (fseeko(stdin, skip, SEEK_SET)) 401 err(1, "%s", fname); 402 address += skip; 403 skip = 0; 404 } else { 405 for (cnt = 0; cnt < skip; ++cnt) 406 if (getchar() == EOF) 407 break; 408 address += cnt; 409 skip -= cnt; 410 } 411 } 412