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 #include "opt_printf.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/lock.h> 46 #include <sys/kdb.h> 47 #include <sys/mutex.h> 48 #include <sys/sx.h> 49 #include <sys/kernel.h> 50 #include <sys/msgbuf.h> 51 #include <sys/malloc.h> 52 #include <sys/priv.h> 53 #include <sys/proc.h> 54 #include <sys/stddef.h> 55 #include <sys/sysctl.h> 56 #include <sys/tty.h> 57 #include <sys/syslog.h> 58 #include <sys/cons.h> 59 #include <sys/uio.h> 60 #include <sys/ctype.h> 61 62 #ifdef DDB 63 #include <ddb/ddb.h> 64 #endif 65 66 /* 67 * Note that stdarg.h and the ANSI style va_start macro is used for both 68 * ANSI and traditional C compilers. 69 */ 70 #include <machine/stdarg.h> 71 72 #define TOCONS 0x01 73 #define TOTTY 0x02 74 #define TOLOG 0x04 75 76 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */ 77 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1) 78 79 struct putchar_arg { 80 int flags; 81 int pri; 82 struct tty *tty; 83 char *p_bufr; 84 size_t n_bufr; 85 char *p_next; 86 size_t remain; 87 }; 88 89 struct snprintf_arg { 90 char *str; 91 size_t remain; 92 }; 93 94 extern int log_open; 95 96 static void msglogchar(int c, int pri); 97 static void msglogstr(char *str, int pri, int filter_cr); 98 static void putchar(int ch, void *arg); 99 static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper); 100 static void snprintf_func(int ch, void *arg); 101 102 static int msgbufmapped; /* Set when safe to use msgbuf */ 103 int msgbuftrigger; 104 105 static int log_console_output = 1; 106 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RWTUN, 107 &log_console_output, 0, "Duplicate console output to the syslog"); 108 109 /* 110 * See the comment in log_console() below for more explanation of this. 111 */ 112 static int log_console_add_linefeed; 113 SYSCTL_INT(_kern, OID_AUTO, log_console_add_linefeed, CTLFLAG_RWTUN, 114 &log_console_add_linefeed, 0, "log_console() adds extra newlines"); 115 116 static int always_console_output; 117 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RWTUN, 118 &always_console_output, 0, "Always output to console despite TIOCCONS"); 119 120 /* 121 * Warn that a system table is full. 122 */ 123 void 124 tablefull(const char *tab) 125 { 126 127 log(LOG_ERR, "%s: table is full\n", tab); 128 } 129 130 /* 131 * Uprintf prints to the controlling terminal for the current process. 132 */ 133 int 134 uprintf(const char *fmt, ...) 135 { 136 va_list ap; 137 struct putchar_arg pca; 138 struct proc *p; 139 struct thread *td; 140 int retval; 141 142 td = curthread; 143 if (TD_IS_IDLETHREAD(td)) 144 return (0); 145 146 sx_slock(&proctree_lock); 147 p = td->td_proc; 148 PROC_LOCK(p); 149 if ((p->p_flag & P_CONTROLT) == 0) { 150 PROC_UNLOCK(p); 151 sx_sunlock(&proctree_lock); 152 return (0); 153 } 154 SESS_LOCK(p->p_session); 155 pca.tty = p->p_session->s_ttyp; 156 SESS_UNLOCK(p->p_session); 157 PROC_UNLOCK(p); 158 if (pca.tty == NULL) { 159 sx_sunlock(&proctree_lock); 160 return (0); 161 } 162 pca.flags = TOTTY; 163 pca.p_bufr = NULL; 164 va_start(ap, fmt); 165 tty_lock(pca.tty); 166 sx_sunlock(&proctree_lock); 167 retval = kvprintf(fmt, putchar, &pca, 10, ap); 168 tty_unlock(pca.tty); 169 va_end(ap); 170 return (retval); 171 } 172 173 /* 174 * tprintf and vtprintf print on the controlling terminal associated with the 175 * given session, possibly to the log as well. 176 */ 177 void 178 tprintf(struct proc *p, int pri, const char *fmt, ...) 179 { 180 va_list ap; 181 182 va_start(ap, fmt); 183 vtprintf(p, pri, fmt, ap); 184 va_end(ap); 185 } 186 187 void 188 vtprintf(struct proc *p, int pri, const char *fmt, va_list ap) 189 { 190 struct tty *tp = NULL; 191 int flags = 0; 192 struct putchar_arg pca; 193 struct session *sess = NULL; 194 195 sx_slock(&proctree_lock); 196 if (pri != -1) 197 flags |= TOLOG; 198 if (p != NULL) { 199 PROC_LOCK(p); 200 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 201 sess = p->p_session; 202 sess_hold(sess); 203 PROC_UNLOCK(p); 204 tp = sess->s_ttyp; 205 if (tp != NULL && tty_checkoutq(tp)) 206 flags |= TOTTY; 207 else 208 tp = NULL; 209 } else 210 PROC_UNLOCK(p); 211 } 212 pca.pri = pri; 213 pca.tty = tp; 214 pca.flags = flags; 215 pca.p_bufr = NULL; 216 if (pca.tty != NULL) 217 tty_lock(pca.tty); 218 sx_sunlock(&proctree_lock); 219 kvprintf(fmt, putchar, &pca, 10, ap); 220 if (pca.tty != NULL) 221 tty_unlock(pca.tty); 222 if (sess != NULL) 223 sess_release(sess); 224 msgbuftrigger = 1; 225 } 226 227 /* 228 * Ttyprintf displays a message on a tty; it should be used only by 229 * the tty driver, or anything that knows the underlying tty will not 230 * be revoke(2)'d away. Other callers should use tprintf. 231 */ 232 int 233 ttyprintf(struct tty *tp, const char *fmt, ...) 234 { 235 va_list ap; 236 struct putchar_arg pca; 237 int retval; 238 239 va_start(ap, fmt); 240 pca.tty = tp; 241 pca.flags = TOTTY; 242 pca.p_bufr = NULL; 243 retval = kvprintf(fmt, putchar, &pca, 10, ap); 244 va_end(ap); 245 return (retval); 246 } 247 248 static int 249 _vprintf(int level, int flags, const char *fmt, va_list ap) 250 { 251 struct putchar_arg pca; 252 int retval; 253 #ifdef PRINTF_BUFR_SIZE 254 char bufr[PRINTF_BUFR_SIZE]; 255 #endif 256 257 pca.tty = NULL; 258 pca.pri = level; 259 pca.flags = flags; 260 #ifdef PRINTF_BUFR_SIZE 261 pca.p_bufr = bufr; 262 pca.p_next = pca.p_bufr; 263 pca.n_bufr = sizeof(bufr); 264 pca.remain = sizeof(bufr); 265 *pca.p_next = '\0'; 266 #else 267 /* Don't buffer console output. */ 268 pca.p_bufr = NULL; 269 #endif 270 271 retval = kvprintf(fmt, putchar, &pca, 10, ap); 272 273 #ifdef PRINTF_BUFR_SIZE 274 /* Write any buffered console/log output: */ 275 if (*pca.p_bufr != '\0') { 276 if (pca.flags & TOLOG) 277 msglogstr(pca.p_bufr, level, /*filter_cr*/1); 278 279 if (pca.flags & TOCONS) 280 cnputs(pca.p_bufr); 281 } 282 #endif 283 284 return (retval); 285 } 286 287 /* 288 * Log writes to the log buffer, and guarantees not to sleep (so can be 289 * called by interrupt routines). If there is no process reading the 290 * log yet, it writes to the console also. 291 */ 292 void 293 log(int level, const char *fmt, ...) 294 { 295 va_list ap; 296 297 va_start(ap, fmt); 298 (void)_vprintf(level, log_open ? TOLOG : TOCONS, fmt, ap); 299 va_end(ap); 300 301 msgbuftrigger = 1; 302 } 303 304 #define CONSCHUNK 128 305 306 void 307 log_console(struct uio *uio) 308 { 309 int c, error, nl; 310 char *consbuffer; 311 int pri; 312 313 if (!log_console_output) 314 return; 315 316 pri = LOG_INFO | LOG_CONSOLE; 317 uio = cloneuio(uio); 318 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK); 319 320 nl = 0; 321 while (uio->uio_resid > 0) { 322 c = imin(uio->uio_resid, CONSCHUNK - 1); 323 error = uiomove(consbuffer, c, uio); 324 if (error != 0) 325 break; 326 /* Make sure we're NUL-terminated */ 327 consbuffer[c] = '\0'; 328 if (consbuffer[c - 1] == '\n') 329 nl = 1; 330 else 331 nl = 0; 332 msglogstr(consbuffer, pri, /*filter_cr*/ 1); 333 } 334 /* 335 * The previous behavior in log_console() is preserved when 336 * log_console_add_linefeed is non-zero. For that behavior, if an 337 * individual console write came in that was not terminated with a 338 * line feed, it would add a line feed. 339 * 340 * This results in different data in the message buffer than 341 * appears on the system console (which doesn't add extra line feed 342 * characters). 343 * 344 * A number of programs and rc scripts write a line feed, or a period 345 * and a line feed when they have completed their operation. On 346 * the console, this looks seamless, but when displayed with 347 * 'dmesg -a', you wind up with output that looks like this: 348 * 349 * Updating motd: 350 * . 351 * 352 * On the console, it looks like this: 353 * Updating motd:. 354 * 355 * We could add logic to detect that situation, or just not insert 356 * the extra newlines. Set the kern.log_console_add_linefeed 357 * sysctl/tunable variable to get the old behavior. 358 */ 359 if (!nl && log_console_add_linefeed) { 360 consbuffer[0] = '\n'; 361 consbuffer[1] = '\0'; 362 msglogstr(consbuffer, pri, /*filter_cr*/ 1); 363 } 364 msgbuftrigger = 1; 365 free(uio, M_IOV); 366 free(consbuffer, M_TEMP); 367 return; 368 } 369 370 int 371 printf(const char *fmt, ...) 372 { 373 va_list ap; 374 int retval; 375 376 va_start(ap, fmt); 377 retval = vprintf(fmt, ap); 378 va_end(ap); 379 380 return (retval); 381 } 382 383 int 384 vprintf(const char *fmt, va_list ap) 385 { 386 int retval; 387 388 retval = _vprintf(-1, TOCONS | TOLOG, fmt, ap); 389 390 if (!panicstr) 391 msgbuftrigger = 1; 392 393 return (retval); 394 } 395 396 static void 397 putbuf(int c, struct putchar_arg *ap) 398 { 399 /* Check if no console output buffer was provided. */ 400 if (ap->p_bufr == NULL) { 401 /* Output direct to the console. */ 402 if (ap->flags & TOCONS) 403 cnputc(c); 404 405 if (ap->flags & TOLOG) 406 msglogchar(c, ap->pri); 407 } else { 408 /* Buffer the character: */ 409 *ap->p_next++ = c; 410 ap->remain--; 411 412 /* Always leave the buffer zero terminated. */ 413 *ap->p_next = '\0'; 414 415 /* Check if the buffer needs to be flushed. */ 416 if (ap->remain == 2 || c == '\n') { 417 418 if (ap->flags & TOLOG) 419 msglogstr(ap->p_bufr, ap->pri, /*filter_cr*/1); 420 421 if (ap->flags & TOCONS) { 422 if ((panicstr == NULL) && (constty != NULL)) 423 msgbuf_addstr(&consmsgbuf, -1, 424 ap->p_bufr, /*filter_cr*/ 0); 425 426 if ((constty == NULL) ||(always_console_output)) 427 cnputs(ap->p_bufr); 428 } 429 430 ap->p_next = ap->p_bufr; 431 ap->remain = ap->n_bufr; 432 *ap->p_next = '\0'; 433 } 434 435 /* 436 * Since we fill the buffer up one character at a time, 437 * this should not happen. We should always catch it when 438 * ap->remain == 2 (if not sooner due to a newline), flush 439 * the buffer and move on. One way this could happen is 440 * if someone sets PRINTF_BUFR_SIZE to 1 or something 441 * similarly silly. 442 */ 443 KASSERT(ap->remain > 2, ("Bad buffer logic, remain = %zd", 444 ap->remain)); 445 } 446 } 447 448 /* 449 * Print a character on console or users terminal. If destination is 450 * the console then the last bunch of characters are saved in msgbuf for 451 * inspection later. 452 */ 453 static void 454 putchar(int c, void *arg) 455 { 456 struct putchar_arg *ap = (struct putchar_arg*) arg; 457 struct tty *tp = ap->tty; 458 int flags = ap->flags; 459 460 /* Don't use the tty code after a panic or while in ddb. */ 461 if (kdb_active) { 462 if (c != '\0') 463 cnputc(c); 464 return; 465 } 466 467 if ((flags & TOTTY) && tp != NULL && panicstr == NULL) 468 tty_putchar(tp, c); 469 470 if ((flags & (TOCONS | TOLOG)) && c != '\0') 471 putbuf(c, ap); 472 } 473 474 /* 475 * Scaled down version of sprintf(3). 476 */ 477 int 478 sprintf(char *buf, const char *cfmt, ...) 479 { 480 int retval; 481 va_list ap; 482 483 va_start(ap, cfmt); 484 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 485 buf[retval] = '\0'; 486 va_end(ap); 487 return (retval); 488 } 489 490 /* 491 * Scaled down version of vsprintf(3). 492 */ 493 int 494 vsprintf(char *buf, const char *cfmt, va_list ap) 495 { 496 int retval; 497 498 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 499 buf[retval] = '\0'; 500 return (retval); 501 } 502 503 /* 504 * Scaled down version of snprintf(3). 505 */ 506 int 507 snprintf(char *str, size_t size, const char *format, ...) 508 { 509 int retval; 510 va_list ap; 511 512 va_start(ap, format); 513 retval = vsnprintf(str, size, format, ap); 514 va_end(ap); 515 return(retval); 516 } 517 518 /* 519 * Scaled down version of vsnprintf(3). 520 */ 521 int 522 vsnprintf(char *str, size_t size, const char *format, va_list ap) 523 { 524 struct snprintf_arg info; 525 int retval; 526 527 info.str = str; 528 info.remain = size; 529 retval = kvprintf(format, snprintf_func, &info, 10, ap); 530 if (info.remain >= 1) 531 *info.str++ = '\0'; 532 return (retval); 533 } 534 535 /* 536 * Kernel version which takes radix argument vsnprintf(3). 537 */ 538 int 539 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap) 540 { 541 struct snprintf_arg info; 542 int retval; 543 544 info.str = str; 545 info.remain = size; 546 retval = kvprintf(format, snprintf_func, &info, radix, ap); 547 if (info.remain >= 1) 548 *info.str++ = '\0'; 549 return (retval); 550 } 551 552 static void 553 snprintf_func(int ch, void *arg) 554 { 555 struct snprintf_arg *const info = arg; 556 557 if (info->remain >= 2) { 558 *info->str++ = ch; 559 info->remain--; 560 } 561 } 562 563 /* 564 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 565 * order; return an optional length and a pointer to the last character 566 * written in the buffer (i.e., the first character of the string). 567 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 568 */ 569 static char * 570 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 571 { 572 char *p, c; 573 574 p = nbuf; 575 *p = '\0'; 576 do { 577 c = hex2ascii(num % base); 578 *++p = upper ? toupper(c) : c; 579 } while (num /= base); 580 if (lenp) 581 *lenp = p - nbuf; 582 return (p); 583 } 584 585 /* 586 * Scaled down version of printf(3). 587 * 588 * Two additional formats: 589 * 590 * The format %b is supported to decode error registers. 591 * Its usage is: 592 * 593 * printf("reg=%b\n", regval, "<base><arg>*"); 594 * 595 * where <base> is the output base expressed as a control character, e.g. 596 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 597 * the first of which gives the bit number to be inspected (origin 1), and 598 * the next characters (up to a control character, i.e. a character <= 32), 599 * give the name of the register. Thus: 600 * 601 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 602 * 603 * would produce output: 604 * 605 * reg=3<BITTWO,BITONE> 606 * 607 * XXX: %D -- Hexdump, takes pointer and separator string: 608 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX 609 * ("%*D", len, ptr, " " -> XX XX XX XX ... 610 */ 611 int 612 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap) 613 { 614 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; } 615 char nbuf[MAXNBUF]; 616 char *d; 617 const char *p, *percent, *q; 618 u_char *up; 619 int ch, n; 620 uintmax_t num; 621 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot; 622 int cflag, hflag, jflag, tflag, zflag; 623 int dwidth, upper; 624 char padc; 625 int stop = 0, retval = 0; 626 627 num = 0; 628 if (!func) 629 d = (char *) arg; 630 else 631 d = NULL; 632 633 if (fmt == NULL) 634 fmt = "(fmt null)\n"; 635 636 if (radix < 2 || radix > 36) 637 radix = 10; 638 639 for (;;) { 640 padc = ' '; 641 width = 0; 642 while ((ch = (u_char)*fmt++) != '%' || stop) { 643 if (ch == '\0') 644 return (retval); 645 PCHAR(ch); 646 } 647 percent = fmt - 1; 648 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; 649 sign = 0; dot = 0; dwidth = 0; upper = 0; 650 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0; 651 reswitch: switch (ch = (u_char)*fmt++) { 652 case '.': 653 dot = 1; 654 goto reswitch; 655 case '#': 656 sharpflag = 1; 657 goto reswitch; 658 case '+': 659 sign = 1; 660 goto reswitch; 661 case '-': 662 ladjust = 1; 663 goto reswitch; 664 case '%': 665 PCHAR(ch); 666 break; 667 case '*': 668 if (!dot) { 669 width = va_arg(ap, int); 670 if (width < 0) { 671 ladjust = !ladjust; 672 width = -width; 673 } 674 } else { 675 dwidth = va_arg(ap, int); 676 } 677 goto reswitch; 678 case '0': 679 if (!dot) { 680 padc = '0'; 681 goto reswitch; 682 } 683 case '1': case '2': case '3': case '4': 684 case '5': case '6': case '7': case '8': case '9': 685 for (n = 0;; ++fmt) { 686 n = n * 10 + ch - '0'; 687 ch = *fmt; 688 if (ch < '0' || ch > '9') 689 break; 690 } 691 if (dot) 692 dwidth = n; 693 else 694 width = n; 695 goto reswitch; 696 case 'b': 697 num = (u_int)va_arg(ap, int); 698 p = va_arg(ap, char *); 699 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;) 700 PCHAR(*q--); 701 702 if (num == 0) 703 break; 704 705 for (tmp = 0; *p;) { 706 n = *p++; 707 if (num & (1 << (n - 1))) { 708 PCHAR(tmp ? ',' : '<'); 709 for (; (n = *p) > ' '; ++p) 710 PCHAR(n); 711 tmp = 1; 712 } else 713 for (; *p > ' '; ++p) 714 continue; 715 } 716 if (tmp) 717 PCHAR('>'); 718 break; 719 case 'c': 720 PCHAR(va_arg(ap, int)); 721 break; 722 case 'D': 723 up = va_arg(ap, u_char *); 724 p = va_arg(ap, char *); 725 if (!width) 726 width = 16; 727 while(width--) { 728 PCHAR(hex2ascii(*up >> 4)); 729 PCHAR(hex2ascii(*up & 0x0f)); 730 up++; 731 if (width) 732 for (q=p;*q;q++) 733 PCHAR(*q); 734 } 735 break; 736 case 'd': 737 case 'i': 738 base = 10; 739 sign = 1; 740 goto handle_sign; 741 case 'h': 742 if (hflag) { 743 hflag = 0; 744 cflag = 1; 745 } else 746 hflag = 1; 747 goto reswitch; 748 case 'j': 749 jflag = 1; 750 goto reswitch; 751 case 'l': 752 if (lflag) { 753 lflag = 0; 754 qflag = 1; 755 } else 756 lflag = 1; 757 goto reswitch; 758 case 'n': 759 if (jflag) 760 *(va_arg(ap, intmax_t *)) = retval; 761 else if (qflag) 762 *(va_arg(ap, quad_t *)) = retval; 763 else if (lflag) 764 *(va_arg(ap, long *)) = retval; 765 else if (zflag) 766 *(va_arg(ap, size_t *)) = retval; 767 else if (hflag) 768 *(va_arg(ap, short *)) = retval; 769 else if (cflag) 770 *(va_arg(ap, char *)) = retval; 771 else 772 *(va_arg(ap, int *)) = retval; 773 break; 774 case 'o': 775 base = 8; 776 goto handle_nosign; 777 case 'p': 778 base = 16; 779 sharpflag = (width == 0); 780 sign = 0; 781 num = (uintptr_t)va_arg(ap, void *); 782 goto number; 783 case 'q': 784 qflag = 1; 785 goto reswitch; 786 case 'r': 787 base = radix; 788 if (sign) 789 goto handle_sign; 790 goto handle_nosign; 791 case 's': 792 p = va_arg(ap, char *); 793 if (p == NULL) 794 p = "(null)"; 795 if (!dot) 796 n = strlen (p); 797 else 798 for (n = 0; n < dwidth && p[n]; n++) 799 continue; 800 801 width -= n; 802 803 if (!ladjust && width > 0) 804 while (width--) 805 PCHAR(padc); 806 while (n--) 807 PCHAR(*p++); 808 if (ladjust && width > 0) 809 while (width--) 810 PCHAR(padc); 811 break; 812 case 't': 813 tflag = 1; 814 goto reswitch; 815 case 'u': 816 base = 10; 817 goto handle_nosign; 818 case 'X': 819 upper = 1; 820 case 'x': 821 base = 16; 822 goto handle_nosign; 823 case 'y': 824 base = 16; 825 sign = 1; 826 goto handle_sign; 827 case 'z': 828 zflag = 1; 829 goto reswitch; 830 handle_nosign: 831 sign = 0; 832 if (jflag) 833 num = va_arg(ap, uintmax_t); 834 else if (qflag) 835 num = va_arg(ap, u_quad_t); 836 else if (tflag) 837 num = va_arg(ap, ptrdiff_t); 838 else if (lflag) 839 num = va_arg(ap, u_long); 840 else if (zflag) 841 num = va_arg(ap, size_t); 842 else if (hflag) 843 num = (u_short)va_arg(ap, int); 844 else if (cflag) 845 num = (u_char)va_arg(ap, int); 846 else 847 num = va_arg(ap, u_int); 848 goto number; 849 handle_sign: 850 if (jflag) 851 num = va_arg(ap, intmax_t); 852 else if (qflag) 853 num = va_arg(ap, quad_t); 854 else if (tflag) 855 num = va_arg(ap, ptrdiff_t); 856 else if (lflag) 857 num = va_arg(ap, long); 858 else if (zflag) 859 num = va_arg(ap, ssize_t); 860 else if (hflag) 861 num = (short)va_arg(ap, int); 862 else if (cflag) 863 num = (char)va_arg(ap, int); 864 else 865 num = va_arg(ap, int); 866 number: 867 if (sign && (intmax_t)num < 0) { 868 neg = 1; 869 num = -(intmax_t)num; 870 } 871 p = ksprintn(nbuf, num, base, &n, upper); 872 tmp = 0; 873 if (sharpflag && num != 0) { 874 if (base == 8) 875 tmp++; 876 else if (base == 16) 877 tmp += 2; 878 } 879 if (neg) 880 tmp++; 881 882 if (!ladjust && padc == '0') 883 dwidth = width - tmp; 884 width -= tmp + imax(dwidth, n); 885 dwidth -= n; 886 if (!ladjust) 887 while (width-- > 0) 888 PCHAR(' '); 889 if (neg) 890 PCHAR('-'); 891 if (sharpflag && num != 0) { 892 if (base == 8) { 893 PCHAR('0'); 894 } else if (base == 16) { 895 PCHAR('0'); 896 PCHAR('x'); 897 } 898 } 899 while (dwidth-- > 0) 900 PCHAR('0'); 901 902 while (*p) 903 PCHAR(*p--); 904 905 if (ladjust) 906 while (width-- > 0) 907 PCHAR(' '); 908 909 break; 910 default: 911 while (percent < fmt) 912 PCHAR(*percent++); 913 /* 914 * Since we ignore a formatting argument it is no 915 * longer safe to obey the remaining formatting 916 * arguments as the arguments will no longer match 917 * the format specs. 918 */ 919 stop = 1; 920 break; 921 } 922 } 923 #undef PCHAR 924 } 925 926 /* 927 * Put character in log buffer with a particular priority. 928 */ 929 static void 930 msglogchar(int c, int pri) 931 { 932 static int lastpri = -1; 933 static int dangling; 934 char nbuf[MAXNBUF]; 935 char *p; 936 937 if (!msgbufmapped) 938 return; 939 if (c == '\0' || c == '\r') 940 return; 941 if (pri != -1 && pri != lastpri) { 942 if (dangling) { 943 msgbuf_addchar(msgbufp, '\n'); 944 dangling = 0; 945 } 946 msgbuf_addchar(msgbufp, '<'); 947 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;) 948 msgbuf_addchar(msgbufp, *p--); 949 msgbuf_addchar(msgbufp, '>'); 950 lastpri = pri; 951 } 952 msgbuf_addchar(msgbufp, c); 953 if (c == '\n') { 954 dangling = 0; 955 lastpri = -1; 956 } else { 957 dangling = 1; 958 } 959 } 960 961 static void 962 msglogstr(char *str, int pri, int filter_cr) 963 { 964 if (!msgbufmapped) 965 return; 966 967 msgbuf_addstr(msgbufp, pri, str, filter_cr); 968 } 969 970 void 971 msgbufinit(void *ptr, int size) 972 { 973 char *cp; 974 static struct msgbuf *oldp = NULL; 975 976 size -= sizeof(*msgbufp); 977 cp = (char *)ptr; 978 msgbufp = (struct msgbuf *)(cp + size); 979 msgbuf_reinit(msgbufp, cp, size); 980 if (msgbufmapped && oldp != msgbufp) 981 msgbuf_copy(oldp, msgbufp); 982 msgbufmapped = 1; 983 oldp = msgbufp; 984 } 985 986 static int unprivileged_read_msgbuf = 1; 987 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf, 988 CTLFLAG_RW, &unprivileged_read_msgbuf, 0, 989 "Unprivileged processes may read the kernel message buffer"); 990 991 /* Sysctls for accessing/clearing the msgbuf */ 992 static int 993 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS) 994 { 995 char buf[128]; 996 u_int seq; 997 int error, len; 998 999 if (!unprivileged_read_msgbuf) { 1000 error = priv_check(req->td, PRIV_MSGBUF); 1001 if (error) 1002 return (error); 1003 } 1004 1005 /* Read the whole buffer, one chunk at a time. */ 1006 mtx_lock(&msgbuf_lock); 1007 msgbuf_peekbytes(msgbufp, NULL, 0, &seq); 1008 for (;;) { 1009 len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq); 1010 mtx_unlock(&msgbuf_lock); 1011 if (len == 0) 1012 return (0); 1013 1014 error = sysctl_handle_opaque(oidp, buf, len, req); 1015 if (error) 1016 return (error); 1017 1018 mtx_lock(&msgbuf_lock); 1019 } 1020 } 1021 1022 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, 1023 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 1024 NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 1025 1026 static int msgbuf_clearflag; 1027 1028 static int 1029 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 1030 { 1031 int error; 1032 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 1033 if (!error && req->newptr) { 1034 mtx_lock(&msgbuf_lock); 1035 msgbuf_clear(msgbufp); 1036 mtx_unlock(&msgbuf_lock); 1037 msgbuf_clearflag = 0; 1038 } 1039 return (error); 1040 } 1041 1042 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 1043 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE, 1044 &msgbuf_clearflag, 0, sysctl_kern_msgbuf_clear, "I", 1045 "Clear kernel message buffer"); 1046 1047 #ifdef DDB 1048 1049 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 1050 { 1051 int i, j; 1052 1053 if (!msgbufmapped) { 1054 db_printf("msgbuf not mapped yet\n"); 1055 return; 1056 } 1057 db_printf("msgbufp = %p\n", msgbufp); 1058 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n", 1059 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq, 1060 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum); 1061 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) { 1062 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq); 1063 db_printf("%c", msgbufp->msg_ptr[j]); 1064 } 1065 db_printf("\n"); 1066 } 1067 1068 #endif /* DDB */ 1069 1070 void 1071 hexdump(const void *ptr, int length, const char *hdr, int flags) 1072 { 1073 int i, j, k; 1074 int cols; 1075 const unsigned char *cp; 1076 char delim; 1077 1078 if ((flags & HD_DELIM_MASK) != 0) 1079 delim = (flags & HD_DELIM_MASK) >> 8; 1080 else 1081 delim = ' '; 1082 1083 if ((flags & HD_COLUMN_MASK) != 0) 1084 cols = flags & HD_COLUMN_MASK; 1085 else 1086 cols = 16; 1087 1088 cp = ptr; 1089 for (i = 0; i < length; i+= cols) { 1090 if (hdr != NULL) 1091 printf("%s", hdr); 1092 1093 if ((flags & HD_OMIT_COUNT) == 0) 1094 printf("%04x ", i); 1095 1096 if ((flags & HD_OMIT_HEX) == 0) { 1097 for (j = 0; j < cols; j++) { 1098 k = i + j; 1099 if (k < length) 1100 printf("%c%02x", delim, cp[k]); 1101 else 1102 printf(" "); 1103 } 1104 } 1105 1106 if ((flags & HD_OMIT_CHARS) == 0) { 1107 printf(" |"); 1108 for (j = 0; j < cols; j++) { 1109 k = i + j; 1110 if (k >= length) 1111 printf(" "); 1112 else if (cp[k] >= ' ' && cp[k] <= '~') 1113 printf("%c", cp[k]); 1114 else 1115 printf("."); 1116 } 1117 printf("|"); 1118 } 1119 printf("\n"); 1120 } 1121 } 1122