hexdump.c revision 156001
1/*- 2 * Copyright (c) 1986, 1988, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94 35 */ 36 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: head/sys/kern/subr_prf.c 156001 2006-02-25 16:20:22Z scottl $"); 39 40#include "opt_ddb.h" 41 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/lock.h> 45#include <sys/kdb.h> 46#include <sys/mutex.h> 47#include <sys/sx.h> 48#include <sys/kernel.h> 49#include <sys/msgbuf.h> 50#include <sys/malloc.h> 51#include <sys/proc.h> 52#include <sys/stddef.h> 53#include <sys/sysctl.h> 54#include <sys/tty.h> 55#include <sys/syslog.h> 56#include <sys/cons.h> 57#include <sys/uio.h> 58 59#ifdef DDB 60#include <ddb/ddb.h> 61#endif 62 63/* 64 * Note that stdarg.h and the ANSI style va_start macro is used for both 65 * ANSI and traditional C compilers. 66 */ 67#include <machine/stdarg.h> 68 69#define TOCONS 0x01 70#define TOTTY 0x02 71#define TOLOG 0x04 72 73/* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */ 74#define MAXNBUF (sizeof(intmax_t) * NBBY + 1) 75 76struct putchar_arg { 77 int flags; 78 int pri; 79 struct tty *tty; 80}; 81 82struct snprintf_arg { 83 char *str; 84 size_t remain; 85}; 86 87extern int log_open; 88 89static void msglogchar(int c, int pri); 90static void putchar(int ch, void *arg); 91static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len); 92static void snprintf_func(int ch, void *arg); 93 94static int consintr = 1; /* Ok to handle console interrupts? */ 95static int msgbufmapped; /* Set when safe to use msgbuf */ 96int msgbuftrigger; 97 98static int log_console_output = 1; 99TUNABLE_INT("kern.log_console_output", &log_console_output); 100SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW, 101 &log_console_output, 0, "Duplicate console output to the syslog."); 102 103static int always_console_output = 0; 104TUNABLE_INT("kern.always_console_output", &always_console_output); 105SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW, 106 &always_console_output, 0, "Always output to console despite TIOCCONS."); 107 108/* 109 * Warn that a system table is full. 110 */ 111void 112tablefull(const char *tab) 113{ 114 115 log(LOG_ERR, "%s: table is full\n", tab); 116} 117 118/* 119 * Uprintf prints to the controlling terminal for the current process. 120 */ 121int 122uprintf(const char *fmt, ...) 123{ 124 struct thread *td = curthread; 125 struct proc *p = td->td_proc; 126 va_list ap; 127 struct putchar_arg pca; 128 int retval; 129 130 if (td == NULL || td == PCPU_GET(idlethread)) 131 return (0); 132 133 mtx_lock(&Giant); 134 p = td->td_proc; 135 PROC_LOCK(p); 136 if ((p->p_flag & P_CONTROLT) == 0) { 137 PROC_UNLOCK(p); 138 retval = 0; 139 goto out; 140 } 141 SESS_LOCK(p->p_session); 142 pca.tty = p->p_session->s_ttyp; 143 SESS_UNLOCK(p->p_session); 144 PROC_UNLOCK(p); 145 if (pca.tty == NULL) { 146 retval = 0; 147 goto out; 148 } 149 pca.flags = TOTTY; 150 va_start(ap, fmt); 151 retval = kvprintf(fmt, putchar, &pca, 10, ap); 152 va_end(ap); 153out: 154 mtx_unlock(&Giant); 155 return (retval); 156} 157 158/* 159 * tprintf prints on the controlling terminal associated with the given 160 * session, possibly to the log as well. 161 */ 162void 163tprintf(struct proc *p, int pri, const char *fmt, ...) 164{ 165 struct tty *tp = NULL; 166 int flags = 0; 167 va_list ap; 168 struct putchar_arg pca; 169 struct session *sess = NULL; 170 171 mtx_lock(&Giant); 172 if (pri != -1) 173 flags |= TOLOG; 174 if (p != NULL) { 175 PROC_LOCK(p); 176 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 177 sess = p->p_session; 178 SESS_LOCK(sess); 179 PROC_UNLOCK(p); 180 SESSHOLD(sess); 181 tp = sess->s_ttyp; 182 SESS_UNLOCK(sess); 183 if (ttycheckoutq(tp, 0)) 184 flags |= TOTTY; 185 else 186 tp = NULL; 187 } else 188 PROC_UNLOCK(p); 189 } 190 pca.pri = pri; 191 pca.tty = tp; 192 pca.flags = flags; 193 va_start(ap, fmt); 194 kvprintf(fmt, putchar, &pca, 10, ap); 195 va_end(ap); 196 if (sess != NULL) 197 SESSRELE(sess); 198 msgbuftrigger = 1; 199 mtx_unlock(&Giant); 200} 201 202/* 203 * Ttyprintf displays a message on a tty; it should be used only by 204 * the tty driver, or anything that knows the underlying tty will not 205 * be revoke(2)'d away. Other callers should use tprintf. 206 */ 207int 208ttyprintf(struct tty *tp, const char *fmt, ...) 209{ 210 va_list ap; 211 struct putchar_arg pca; 212 int retval; 213 214 va_start(ap, fmt); 215 pca.tty = tp; 216 pca.flags = TOTTY; 217 retval = kvprintf(fmt, putchar, &pca, 10, ap); 218 va_end(ap); 219 return (retval); 220} 221 222/* 223 * Log writes to the log buffer, and guarantees not to sleep (so can be 224 * called by interrupt routines). If there is no process reading the 225 * log yet, it writes to the console also. 226 */ 227void 228log(int level, const char *fmt, ...) 229{ 230 va_list ap; 231 struct putchar_arg pca; 232 233 pca.tty = NULL; 234 pca.pri = level; 235 pca.flags = log_open ? TOLOG : TOCONS; 236 237 va_start(ap, fmt); 238 kvprintf(fmt, putchar, &pca, 10, ap); 239 va_end(ap); 240 241 msgbuftrigger = 1; 242} 243 244#define CONSCHUNK 128 245 246void 247log_console(struct uio *uio) 248{ 249 int c, i, error, nl; 250 char *consbuffer; 251 int pri; 252 253 if (!log_console_output) 254 return; 255 256 pri = LOG_INFO | LOG_CONSOLE; 257 uio = cloneuio(uio); 258 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK); 259 260 nl = 0; 261 while (uio->uio_resid > 0) { 262 c = imin(uio->uio_resid, CONSCHUNK); 263 error = uiomove(consbuffer, c, uio); 264 if (error != 0) 265 break; 266 for (i = 0; i < c; i++) { 267 msglogchar(consbuffer[i], pri); 268 if (consbuffer[i] == '\n') 269 nl = 1; 270 else 271 nl = 0; 272 } 273 } 274 if (!nl) 275 msglogchar('\n', pri); 276 msgbuftrigger = 1; 277 free(uio, M_IOV); 278 free(consbuffer, M_TEMP); 279 return; 280} 281 282int 283printf(const char *fmt, ...) 284{ 285 va_list ap; 286 int savintr; 287 struct putchar_arg pca; 288 int retval; 289 290 savintr = consintr; /* disable interrupts */ 291 consintr = 0; 292 va_start(ap, fmt); 293 pca.tty = NULL; 294 pca.flags = TOCONS | TOLOG; 295 pca.pri = -1; 296 retval = kvprintf(fmt, putchar, &pca, 10, ap); 297 va_end(ap); 298 if (!panicstr) 299 msgbuftrigger = 1; 300 consintr = savintr; /* reenable interrupts */ 301 return (retval); 302} 303 304int 305vprintf(const char *fmt, va_list ap) 306{ 307 int savintr; 308 struct putchar_arg pca; 309 int retval; 310 311 savintr = consintr; /* disable interrupts */ 312 consintr = 0; 313 pca.tty = NULL; 314 pca.flags = TOCONS | TOLOG; 315 pca.pri = -1; 316 retval = kvprintf(fmt, putchar, &pca, 10, ap); 317 if (!panicstr) 318 msgbuftrigger = 1; 319 consintr = savintr; /* reenable interrupts */ 320 return (retval); 321} 322 323/* 324 * Print a character on console or users terminal. If destination is 325 * the console then the last bunch of characters are saved in msgbuf for 326 * inspection later. 327 */ 328static void 329putchar(int c, void *arg) 330{ 331 struct putchar_arg *ap = (struct putchar_arg*) arg; 332 struct tty *tp = ap->tty; 333 int consdirect, flags = ap->flags; 334 335 consdirect = ((flags & TOCONS) && constty == NULL); 336 /* Don't use the tty code after a panic or while in ddb. */ 337 if (panicstr) 338 consdirect = 1; 339 if (kdb_active) 340 consdirect = 1; 341 if (consdirect) { 342 if (c != '\0') 343 cnputc(c); 344 } else { 345 if ((flags & TOTTY) && tp != NULL) 346 tputchar(c, tp); 347 if (flags & TOCONS) { 348 if (constty != NULL) 349 msgbuf_addchar(&consmsgbuf, c); 350 if (always_console_output && c != '\0') 351 cnputc(c); 352 } 353 } 354 if ((flags & TOLOG)) 355 msglogchar(c, ap->pri); 356} 357 358/* 359 * Scaled down version of sprintf(3). 360 */ 361int 362sprintf(char *buf, const char *cfmt, ...) 363{ 364 int retval; 365 va_list ap; 366 367 va_start(ap, cfmt); 368 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 369 buf[retval] = '\0'; 370 va_end(ap); 371 return (retval); 372} 373 374/* 375 * Scaled down version of vsprintf(3). 376 */ 377int 378vsprintf(char *buf, const char *cfmt, va_list ap) 379{ 380 int retval; 381 382 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 383 buf[retval] = '\0'; 384 return (retval); 385} 386 387/* 388 * Scaled down version of snprintf(3). 389 */ 390int 391snprintf(char *str, size_t size, const char *format, ...) 392{ 393 int retval; 394 va_list ap; 395 396 va_start(ap, format); 397 retval = vsnprintf(str, size, format, ap); 398 va_end(ap); 399 return(retval); 400} 401 402/* 403 * Scaled down version of vsnprintf(3). 404 */ 405int 406vsnprintf(char *str, size_t size, const char *format, va_list ap) 407{ 408 struct snprintf_arg info; 409 int retval; 410 411 info.str = str; 412 info.remain = size; 413 retval = kvprintf(format, snprintf_func, &info, 10, ap); 414 if (info.remain >= 1) 415 *info.str++ = '\0'; 416 return (retval); 417} 418 419/* 420 * Kernel version which takes radix argument vsnprintf(3). 421 */ 422int 423vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap) 424{ 425 struct snprintf_arg info; 426 int retval; 427 428 info.str = str; 429 info.remain = size; 430 retval = kvprintf(format, snprintf_func, &info, radix, ap); 431 if (info.remain >= 1) 432 *info.str++ = '\0'; 433 return (retval); 434} 435 436static void 437snprintf_func(int ch, void *arg) 438{ 439 struct snprintf_arg *const info = arg; 440 441 if (info->remain >= 2) { 442 *info->str++ = ch; 443 info->remain--; 444 } 445} 446 447/* 448 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 449 * order; return an optional length and a pointer to the last character 450 * written in the buffer (i.e., the first character of the string). 451 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 452 */ 453static char * 454ksprintn(char *nbuf, uintmax_t num, int base, int *lenp) 455{ 456 char *p; 457 458 p = nbuf; 459 *p = '\0'; 460 do { 461 *++p = hex2ascii(num % base); 462 } while (num /= base); 463 if (lenp) 464 *lenp = p - nbuf; 465 return (p); 466} 467 468/* 469 * Scaled down version of printf(3). 470 * 471 * Two additional formats: 472 * 473 * The format %b is supported to decode error registers. 474 * Its usage is: 475 * 476 * printf("reg=%b\n", regval, "<base><arg>*"); 477 * 478 * where <base> is the output base expressed as a control character, e.g. 479 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 480 * the first of which gives the bit number to be inspected (origin 1), and 481 * the next characters (up to a control character, i.e. a character <= 32), 482 * give the name of the register. Thus: 483 * 484 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 485 * 486 * would produce output: 487 * 488 * reg=3<BITTWO,BITONE> 489 * 490 * XXX: %D -- Hexdump, takes pointer and separator string: 491 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX 492 * ("%*D", len, ptr, " " -> XX XX XX XX ... 493 */ 494int 495kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap) 496{ 497#define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; } 498 char nbuf[MAXNBUF]; 499 char *d; 500 const char *p, *percent, *q; 501 u_char *up; 502 int ch, n; 503 uintmax_t num; 504 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot; 505 int cflag, hflag, jflag, tflag, zflag; 506 int dwidth; 507 char padc; 508 int stop = 0, retval = 0; 509 510 num = 0; 511 if (!func) 512 d = (char *) arg; 513 else 514 d = NULL; 515 516 if (fmt == NULL) 517 fmt = "(fmt null)\n"; 518 519 if (radix < 2 || radix > 36) 520 radix = 10; 521 522 for (;;) { 523 padc = ' '; 524 width = 0; 525 while ((ch = (u_char)*fmt++) != '%' || stop) { 526 if (ch == '\0') 527 return (retval); 528 PCHAR(ch); 529 } 530 percent = fmt - 1; 531 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; 532 sign = 0; dot = 0; dwidth = 0; 533 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0; 534reswitch: switch (ch = (u_char)*fmt++) { 535 case '.': 536 dot = 1; 537 goto reswitch; 538 case '#': 539 sharpflag = 1; 540 goto reswitch; 541 case '+': 542 sign = 1; 543 goto reswitch; 544 case '-': 545 ladjust = 1; 546 goto reswitch; 547 case '%': 548 PCHAR(ch); 549 break; 550 case '*': 551 if (!dot) { 552 width = va_arg(ap, int); 553 if (width < 0) { 554 ladjust = !ladjust; 555 width = -width; 556 } 557 } else { 558 dwidth = va_arg(ap, int); 559 } 560 goto reswitch; 561 case '0': 562 if (!dot) { 563 padc = '0'; 564 goto reswitch; 565 } 566 case '1': case '2': case '3': case '4': 567 case '5': case '6': case '7': case '8': case '9': 568 for (n = 0;; ++fmt) { 569 n = n * 10 + ch - '0'; 570 ch = *fmt; 571 if (ch < '0' || ch > '9') 572 break; 573 } 574 if (dot) 575 dwidth = n; 576 else 577 width = n; 578 goto reswitch; 579 case 'b': 580 num = (u_int)va_arg(ap, int); 581 p = va_arg(ap, char *); 582 for (q = ksprintn(nbuf, num, *p++, NULL); *q;) 583 PCHAR(*q--); 584 585 if (num == 0) 586 break; 587 588 for (tmp = 0; *p;) { 589 n = *p++; 590 if (num & (1 << (n - 1))) { 591 PCHAR(tmp ? ',' : '<'); 592 for (; (n = *p) > ' '; ++p) 593 PCHAR(n); 594 tmp = 1; 595 } else 596 for (; *p > ' '; ++p) 597 continue; 598 } 599 if (tmp) 600 PCHAR('>'); 601 break; 602 case 'c': 603 PCHAR(va_arg(ap, int)); 604 break; 605 case 'D': 606 up = va_arg(ap, u_char *); 607 p = va_arg(ap, char *); 608 if (!width) 609 width = 16; 610 while(width--) { 611 PCHAR(hex2ascii(*up >> 4)); 612 PCHAR(hex2ascii(*up & 0x0f)); 613 up++; 614 if (width) 615 for (q=p;*q;q++) 616 PCHAR(*q); 617 } 618 break; 619 case 'd': 620 case 'i': 621 base = 10; 622 sign = 1; 623 goto handle_sign; 624 case 'h': 625 if (hflag) { 626 hflag = 0; 627 cflag = 1; 628 } else 629 hflag = 1; 630 goto reswitch; 631 case 'j': 632 jflag = 1; 633 goto reswitch; 634 case 'l': 635 if (lflag) { 636 lflag = 0; 637 qflag = 1; 638 } else 639 lflag = 1; 640 goto reswitch; 641 case 'n': 642 if (jflag) 643 *(va_arg(ap, intmax_t *)) = retval; 644 else if (qflag) 645 *(va_arg(ap, quad_t *)) = retval; 646 else if (lflag) 647 *(va_arg(ap, long *)) = retval; 648 else if (zflag) 649 *(va_arg(ap, size_t *)) = retval; 650 else if (hflag) 651 *(va_arg(ap, short *)) = retval; 652 else if (cflag) 653 *(va_arg(ap, char *)) = retval; 654 else 655 *(va_arg(ap, int *)) = retval; 656 break; 657 case 'o': 658 base = 8; 659 goto handle_nosign; 660 case 'p': 661 base = 16; 662 sharpflag = (width == 0); 663 sign = 0; 664 num = (uintptr_t)va_arg(ap, void *); 665 goto number; 666 case 'q': 667 qflag = 1; 668 goto reswitch; 669 case 'r': 670 base = radix; 671 if (sign) 672 goto handle_sign; 673 goto handle_nosign; 674 case 's': 675 p = va_arg(ap, char *); 676 if (p == NULL) 677 p = "(null)"; 678 if (!dot) 679 n = strlen (p); 680 else 681 for (n = 0; n < dwidth && p[n]; n++) 682 continue; 683 684 width -= n; 685 686 if (!ladjust && width > 0) 687 while (width--) 688 PCHAR(padc); 689 while (n--) 690 PCHAR(*p++); 691 if (ladjust && width > 0) 692 while (width--) 693 PCHAR(padc); 694 break; 695 case 't': 696 tflag = 1; 697 goto reswitch; 698 case 'u': 699 base = 10; 700 goto handle_nosign; 701 case 'x': 702 case 'X': 703 base = 16; 704 goto handle_nosign; 705 case 'y': 706 base = 16; 707 sign = 1; 708 goto handle_sign; 709 case 'z': 710 zflag = 1; 711 goto reswitch; 712handle_nosign: 713 sign = 0; 714 if (jflag) 715 num = va_arg(ap, uintmax_t); 716 else if (qflag) 717 num = va_arg(ap, u_quad_t); 718 else if (tflag) 719 num = va_arg(ap, ptrdiff_t); 720 else if (lflag) 721 num = va_arg(ap, u_long); 722 else if (zflag) 723 num = va_arg(ap, size_t); 724 else if (hflag) 725 num = (u_short)va_arg(ap, int); 726 else if (cflag) 727 num = (u_char)va_arg(ap, int); 728 else 729 num = va_arg(ap, u_int); 730 goto number; 731handle_sign: 732 if (jflag) 733 num = va_arg(ap, intmax_t); 734 else if (qflag) 735 num = va_arg(ap, quad_t); 736 else if (tflag) 737 num = va_arg(ap, ptrdiff_t); 738 else if (lflag) 739 num = va_arg(ap, long); 740 else if (zflag) 741 num = va_arg(ap, size_t); 742 else if (hflag) 743 num = (short)va_arg(ap, int); 744 else if (cflag) 745 num = (char)va_arg(ap, int); 746 else 747 num = va_arg(ap, int); 748number: 749 if (sign && (intmax_t)num < 0) { 750 neg = 1; 751 num = -(intmax_t)num; 752 } 753 p = ksprintn(nbuf, num, base, &tmp); 754 if (sharpflag && num != 0) { 755 if (base == 8) 756 tmp++; 757 else if (base == 16) 758 tmp += 2; 759 } 760 if (neg) 761 tmp++; 762 763 if (!ladjust && padc != '0' && width 764 && (width -= tmp) > 0) 765 while (width--) 766 PCHAR(padc); 767 if (neg) 768 PCHAR('-'); 769 if (sharpflag && num != 0) { 770 if (base == 8) { 771 PCHAR('0'); 772 } else if (base == 16) { 773 PCHAR('0'); 774 PCHAR('x'); 775 } 776 } 777 if (!ladjust && width && (width -= tmp) > 0) 778 while (width--) 779 PCHAR(padc); 780 781 while (*p) 782 PCHAR(*p--); 783 784 if (ladjust && width && (width -= tmp) > 0) 785 while (width--) 786 PCHAR(padc); 787 788 break; 789 default: 790 while (percent < fmt) 791 PCHAR(*percent++); 792 /* 793 * Since we ignore an formatting argument it is no 794 * longer safe to obey the remaining formatting 795 * arguments as the arguments will no longer match 796 * the format specs. 797 */ 798 stop = 1; 799 break; 800 } 801 } 802#undef PCHAR 803} 804 805/* 806 * Put character in log buffer with a particular priority. 807 */ 808static void 809msglogchar(int c, int pri) 810{ 811 static int lastpri = -1; 812 static int dangling; 813 char nbuf[MAXNBUF]; 814 char *p; 815 816 if (!msgbufmapped) 817 return; 818 if (c == '\0' || c == '\r') 819 return; 820 if (pri != -1 && pri != lastpri) { 821 if (dangling) { 822 msgbuf_addchar(msgbufp, '\n'); 823 dangling = 0; 824 } 825 msgbuf_addchar(msgbufp, '<'); 826 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL); *p;) 827 msgbuf_addchar(msgbufp, *p--); 828 msgbuf_addchar(msgbufp, '>'); 829 lastpri = pri; 830 } 831 msgbuf_addchar(msgbufp, c); 832 if (c == '\n') { 833 dangling = 0; 834 lastpri = -1; 835 } else { 836 dangling = 1; 837 } 838} 839 840void 841msgbufinit(void *ptr, int size) 842{ 843 char *cp; 844 static struct msgbuf *oldp = NULL; 845 846 size -= sizeof(*msgbufp); 847 cp = (char *)ptr; 848 msgbufp = (struct msgbuf *)(cp + size); 849 msgbuf_reinit(msgbufp, cp, size); 850 if (msgbufmapped && oldp != msgbufp) 851 msgbuf_copy(oldp, msgbufp); 852 msgbufmapped = 1; 853 oldp = msgbufp; 854} 855 856SYSCTL_DECL(_security_bsd); 857 858static int unprivileged_read_msgbuf = 1; 859SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf, 860 CTLFLAG_RW, &unprivileged_read_msgbuf, 0, 861 "Unprivileged processes may read the kernel message buffer"); 862 863/* Sysctls for accessing/clearing the msgbuf */ 864static int 865sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS) 866{ 867 char buf[128]; 868 u_int seq; 869 int error, len; 870 871 if (!unprivileged_read_msgbuf) { 872 error = suser(req->td); 873 if (error) 874 return (error); 875 } 876 877 /* Read the whole buffer, one chunk at a time. */ 878 msgbuf_peekbytes(msgbufp, NULL, 0, &seq); 879 while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) { 880 error = sysctl_handle_opaque(oidp, buf, len, req); 881 if (error) 882 return (error); 883 } 884 return (0); 885} 886 887SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD, 888 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 889 890static int msgbuf_clearflag; 891 892static int 893sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 894{ 895 int error; 896 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 897 if (!error && req->newptr) { 898 msgbuf_clear(msgbufp); 899 msgbuf_clearflag = 0; 900 } 901 return (error); 902} 903 904SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 905 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0, 906 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer"); 907 908#ifdef DDB 909 910DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 911{ 912 int i, j, quit; 913 914 quit = 0; 915 916 if (!msgbufmapped) { 917 db_printf("msgbuf not mapped yet\n"); 918 return; 919 } 920 db_setup_paging(db_simple_pager, &quit, db_lines_per_page); 921 db_printf("msgbufp = %p\n", msgbufp); 922 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n", 923 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq, 924 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum); 925 for (i = 0; i < msgbufp->msg_size && !quit; i++) { 926 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq); 927 db_printf("%c", msgbufp->msg_ptr[j]); 928 } 929 db_printf("\n"); 930} 931 932#endif /* DDB */ 933 934void 935hexdump(const void *ptr, int length, const char *hdr, int flags) 936{ 937 int i, j, k; 938 int cols; 939 const unsigned char *cp; 940 char delim; 941 942 if ((flags & HD_DELIM_MASK) != 0) 943 delim = (flags & HD_DELIM_MASK) >> 8; 944 else 945 delim = ' '; 946 947 if ((flags & HD_COLUMN_MASK) != 0) 948 cols = flags & HD_COLUMN_MASK; 949 else 950 cols = 16; 951 952 cp = ptr; 953 for (i = 0; i < length; i+= cols) { 954 if (hdr != NULL) 955 printf("%s", hdr); 956 957 if ((flags & HD_OMIT_COUNT) == 0) 958 printf("%04x ", i); 959 960 if ((flags & HD_OMIT_HEX) == 0) { 961 for (j = 0; j < cols; j++) { 962 k = i + j; 963 if (k < length) 964 printf("%c%02x", delim, cp[k]); 965 else 966 printf(" "); 967 } 968 } 969 970 if ((flags & HD_OMIT_CHARS) == 0) { 971 printf(" |"); 972 for (j = 0; j < cols; j++) { 973 k = i + j; 974 if (k >= length) 975 printf(" "); 976 else if (cp[k] >= ' ' && cp[k] <= '~') 977 printf("%c", cp[k]); 978 else 979 printf("."); 980 } 981 printf("|"); 982 } 983 printf("\n"); 984 } 985} 986 987