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