syslogd.c revision 82442
1/* 2 * Copyright (c) 1983, 1988, 1993, 1994 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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/usr.sbin/syslogd/syslogd.c 82442 2001-08-27 21:37:15Z cjc $"; 46#endif /* not lint */ 47 48/* 49 * syslogd -- log system messages 50 * 51 * This program implements a system log. It takes a series of lines. 52 * Each line may have a priority, signified as "<n>" as 53 * the first characters of the line. If this is 54 * not present, a default priority is used. 55 * 56 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 57 * cause it to reread its configuration file. 58 * 59 * Defined Constants: 60 * 61 * MAXLINE -- the maximimum line length that can be handled. 62 * DEFUPRI -- the default priority for user messages 63 * DEFSPRI -- the default priority for kernel messages 64 * 65 * Author: Eric Allman 66 * extensive changes by Ralph Campbell 67 * more extensive changes by Eric Allman (again) 68 * Extension to log by program name as well as facility and priority 69 * by Peter da Silva. 70 * -u and -v by Harlan Stenn. 71 * Priority comparison code by Harlan Stenn. 72 */ 73 74#define MAXLINE 1024 /* maximum line length */ 75#define MAXSVLINE 120 /* maximum saved line length */ 76#define DEFUPRI (LOG_USER|LOG_NOTICE) 77#define DEFSPRI (LOG_KERN|LOG_CRIT) 78#define TIMERINTVL 30 /* interval for checking flush, mark */ 79#define TTYMSGTIME 1 /* timed out passed to ttymsg */ 80 81#include <sys/param.h> 82#include <sys/ioctl.h> 83#include <sys/stat.h> 84#include <sys/wait.h> 85#include <sys/socket.h> 86#include <sys/queue.h> 87#include <sys/uio.h> 88#include <sys/un.h> 89#include <sys/time.h> 90#include <sys/resource.h> 91#include <sys/syslimits.h> 92#include <paths.h> 93 94#include <netinet/in.h> 95#include <netdb.h> 96#include <arpa/inet.h> 97 98#include <ctype.h> 99#include <err.h> 100#include <errno.h> 101#include <fcntl.h> 102#include <setjmp.h> 103#include <signal.h> 104#include <stdio.h> 105#include <stdlib.h> 106#include <string.h> 107#include <sysexits.h> 108#include <unistd.h> 109#include <utmp.h> 110#include "pathnames.h" 111 112#define SYSLOG_NAMES 113#include <sys/syslog.h> 114 115#ifdef NI_WITHSCOPEID 116static const int withscopeid = NI_WITHSCOPEID; 117#else 118static const int withscopeid = 0; 119#endif 120 121const char *ConfFile = _PATH_LOGCONF; 122const char *PidFile = _PATH_LOGPID; 123const char ctty[] = _PATH_CONSOLE; 124 125#define dprintf if (Debug) printf 126 127#define MAXUNAMES 20 /* maximum number of user names */ 128 129#define MAXFUNIX 20 130 131int nfunix = 1; 132char *funixn[MAXFUNIX] = { _PATH_LOG }; 133int funix[MAXFUNIX]; 134 135/* 136 * Flags to logmsg(). 137 */ 138 139#define IGN_CONS 0x001 /* don't print on console */ 140#define SYNC_FILE 0x002 /* do fsync on file after printing */ 141#define ADDDATE 0x004 /* add a date to the message */ 142#define MARK 0x008 /* this message is a mark */ 143#define ISKERNEL 0x010 /* kernel generated message */ 144 145/* 146 * This structure represents the files that will have log 147 * copies printed. 148 */ 149 150struct filed { 151 struct filed *f_next; /* next in linked list */ 152 short f_type; /* entry type, see below */ 153 short f_file; /* file descriptor */ 154 time_t f_time; /* time this was last written */ 155 char *f_host; /* host from which to recd. */ 156 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 157 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 158#define PRI_LT 0x1 159#define PRI_EQ 0x2 160#define PRI_GT 0x4 161 char *f_program; /* program this applies to */ 162 union { 163 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 164 struct { 165 char f_hname[MAXHOSTNAMELEN]; 166 struct addrinfo *f_addr; 167 168 } f_forw; /* forwarding address */ 169 char f_fname[MAXPATHLEN]; 170 struct { 171 char f_pname[MAXPATHLEN]; 172 pid_t f_pid; 173 } f_pipe; 174 } f_un; 175 char f_prevline[MAXSVLINE]; /* last message logged */ 176 char f_lasttime[16]; /* time of last occurrence */ 177 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 178 int f_prevpri; /* pri of f_prevline */ 179 int f_prevlen; /* length of f_prevline */ 180 int f_prevcount; /* repetition cnt of prevline */ 181 int f_repeatcount; /* number of "repeated" msgs */ 182}; 183 184/* 185 * Queue of about-to-be dead processes we should watch out for. 186 */ 187 188TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 189struct stailhead *deadq_headp; 190 191struct deadq_entry { 192 pid_t dq_pid; 193 int dq_timeout; 194 TAILQ_ENTRY(deadq_entry) dq_entries; 195}; 196 197/* 198 * The timeout to apply to processes waiting on the dead queue. Unit 199 * of measure is `mark intervals', i.e. 20 minutes by default. 200 * Processes on the dead queue will be terminated after that time. 201 */ 202 203#define DQ_TIMO_INIT 2 204 205typedef struct deadq_entry *dq_t; 206 207 208/* 209 * Struct to hold records of network addresses that are allowed to log 210 * to us. 211 */ 212struct allowedpeer { 213 int isnumeric; 214 u_short port; 215 union { 216 struct { 217 struct sockaddr_storage addr; 218 struct sockaddr_storage mask; 219 } numeric; 220 char *name; 221 } u; 222#define a_addr u.numeric.addr 223#define a_mask u.numeric.mask 224#define a_name u.name 225}; 226 227 228/* 229 * Intervals at which we flush out "message repeated" messages, 230 * in seconds after previous message is logged. After each flush, 231 * we move to the next interval until we reach the largest. 232 */ 233int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 234#define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 235#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 236#define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 237 (f)->f_repeatcount = MAXREPEAT; \ 238 } 239 240/* values for f_type */ 241#define F_UNUSED 0 /* unused entry */ 242#define F_FILE 1 /* regular file */ 243#define F_TTY 2 /* terminal */ 244#define F_CONSOLE 3 /* console terminal */ 245#define F_FORW 4 /* remote machine */ 246#define F_USERS 5 /* list of users */ 247#define F_WALL 6 /* everyone logged on */ 248#define F_PIPE 7 /* pipe to program */ 249 250char *TypeNames[8] = { 251 "UNUSED", "FILE", "TTY", "CONSOLE", 252 "FORW", "USERS", "WALL", "PIPE" 253}; 254 255struct filed *Files; 256struct filed consfile; 257 258int Debug; /* debug flag */ 259int resolve = 1; /* resolve hostname */ 260char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 261char *LocalDomain; /* our local domain name */ 262int *finet = NULL; /* Internet datagram socket */ 263int fklog = -1; /* /dev/klog */ 264int Initialized = 0; /* set when we have initialized ourselves */ 265int MarkInterval = 20 * 60; /* interval between marks in seconds */ 266int MarkSeq = 0; /* mark sequence number */ 267int SecureMode = 0; /* when true, receive only unix domain socks */ 268#ifdef INET6 269int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 270#else 271int family = PF_INET; /* protocol family (IPv4 only) */ 272#endif 273int send_to_all = 0; /* send message to all IPv4/IPv6 addresses */ 274 275char bootfile[MAXLINE+1]; /* booted kernel file */ 276 277struct allowedpeer *AllowedPeers; 278int NumAllowed = 0; /* # of AllowedPeer entries */ 279 280int UniquePriority = 0; /* Only log specified priority? */ 281int LogFacPri = 0; /* Put facility and priority in log message: */ 282 /* 0=no, 1=numeric, 2=names */ 283int KeepKernFac = 0; /* Keep remotely logged kernel facility */ 284 285int allowaddr __P((char *)); 286void cfline __P((char *, struct filed *, char *, char *)); 287char *cvthname __P((struct sockaddr *)); 288void deadq_enter __P((pid_t, const char *)); 289int deadq_remove __P((pid_t)); 290int decode __P((const char *, CODE *)); 291void die __P((int)); 292void domark __P((int)); 293void fprintlog __P((struct filed *, int, char *)); 294int* socksetup __P((int)); 295void init __P((int)); 296void logerror __P((const char *)); 297void logmsg __P((int, char *, char *, int)); 298void log_deadchild __P((pid_t, int, const char *)); 299void printline __P((char *, char *)); 300void printsys __P((char *)); 301int p_open __P((char *, pid_t *)); 302void readklog __P((void)); 303void reapchild __P((int)); 304char *ttymsg __P((struct iovec *, int, char *, int)); 305static void usage __P((void)); 306int validate __P((struct sockaddr *, const char *)); 307static void unmapped __P((struct sockaddr *)); 308void wallmsg __P((struct filed *, struct iovec *)); 309int waitdaemon __P((int, int, int)); 310void timedout __P((int)); 311 312int 313main(argc, argv) 314 int argc; 315 char *argv[]; 316{ 317 int ch, i, l; 318 struct sockaddr_un sunx, fromunix; 319 struct sockaddr_storage frominet; 320 FILE *fp; 321 char *hname, line[MAXLINE + 1]; 322 struct timeval tv, *tvp; 323 struct sigaction sact; 324 sigset_t mask; 325 pid_t ppid = 1; 326 socklen_t len; 327 328 while ((ch = getopt(argc, argv, "46Aa:df:kl:m:np:P:suv")) != -1) 329 switch (ch) { 330 case '4': 331 family = PF_INET; 332 break; 333#ifdef INET6 334 case '6': 335 family = PF_INET6; 336 break; 337#endif 338 case 'A': 339 send_to_all++; 340 break; 341 case 'a': /* allow specific network addresses only */ 342 if (allowaddr(optarg) == -1) 343 usage(); 344 break; 345 case 'd': /* debug */ 346 Debug++; 347 break; 348 case 'f': /* configuration file */ 349 ConfFile = optarg; 350 break; 351 case 'k': /* keep remote kern fac */ 352 KeepKernFac = 1; 353 break; 354 case 'l': 355 if (nfunix < MAXFUNIX) 356 funixn[nfunix++] = optarg; 357 else 358 warnx("out of descriptors, ignoring %s", 359 optarg); 360 break; 361 case 'm': /* mark interval */ 362 MarkInterval = atoi(optarg) * 60; 363 break; 364 case 'n': 365 resolve = 0; 366 break; 367 case 'p': /* path */ 368 funixn[0] = optarg; 369 break; 370 case 'P': /* path for alt. PID */ 371 PidFile = optarg; 372 break; 373 case 's': /* no network mode */ 374 SecureMode++; 375 break; 376 case 'u': /* only log specified priority */ 377 UniquePriority++; 378 break; 379 case 'v': /* log facility and priority */ 380 LogFacPri++; 381 break; 382 case '?': 383 default: 384 usage(); 385 } 386 if ((argc -= optind) != 0) 387 usage(); 388 389 if (!Debug) { 390 ppid = waitdaemon(0, 0, 30); 391 if (ppid < 0) 392 err(1, "could not become daemon"); 393 } else 394 setlinebuf(stdout); 395 396 if (NumAllowed) 397 endservent(); 398 399 consfile.f_type = F_CONSOLE; 400 (void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1); 401 (void)strcpy(bootfile, getbootfile()); 402 (void)signal(SIGTERM, die); 403 (void)signal(SIGINT, Debug ? die : SIG_IGN); 404 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 405 /* 406 * We don't want the SIGCHLD and SIGHUP handlers to interfere 407 * with each other; they are likely candidates for being called 408 * simultaneously (SIGHUP closes pipe descriptor, process dies, 409 * SIGCHLD happens). 410 */ 411 sigemptyset(&mask); 412 sigaddset(&mask, SIGHUP); 413 sact.sa_handler = reapchild; 414 sact.sa_mask = mask; 415 sact.sa_flags = SA_RESTART; 416 (void)sigaction(SIGCHLD, &sact, NULL); 417 (void)signal(SIGALRM, domark); 418 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 419 (void)alarm(TIMERINTVL); 420 421 TAILQ_INIT(&deadq_head); 422 423#ifndef SUN_LEN 424#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 425#endif 426 for (i = 0; i < nfunix; i++) { 427 memset(&sunx, 0, sizeof(sunx)); 428 sunx.sun_family = AF_UNIX; 429 (void)strncpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 430 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 431 if (funix[i] < 0 || 432 bind(funix[i], (struct sockaddr *)&sunx, 433 SUN_LEN(&sunx)) < 0 || 434 chmod(funixn[i], 0666) < 0) { 435 (void) snprintf(line, sizeof line, 436 "cannot create %s", funixn[i]); 437 logerror(line); 438 dprintf("cannot create %s (%d)\n", funixn[i], errno); 439 if (i == 0) 440 die(0); 441 } 442 } 443 if (SecureMode <= 1) 444 finet = socksetup(family); 445 446 if (finet) { 447 if (SecureMode) { 448 for (i = 0; i < *finet; i++) { 449 if (shutdown(finet[i+1], SHUT_RD) < 0) { 450 logerror("shutdown"); 451 if (!Debug) 452 die(0); 453 } 454 } 455 } else 456 dprintf("listening on inet and/or inet6 socket\n"); 457 dprintf("sending on inet and/or inet6 socket\n"); 458 } 459 460 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 461 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 462 fklog = -1; 463 if (fklog < 0) 464 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 465 466 /* tuck my process id away */ 467 fp = fopen(PidFile, "w"); 468 if (fp != NULL) { 469 fprintf(fp, "%d\n", getpid()); 470 (void) fclose(fp); 471 } 472 473 dprintf("off & running....\n"); 474 475 init(0); 476 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 477 sigemptyset(&mask); 478 sigaddset(&mask, SIGCHLD); 479 sact.sa_handler = init; 480 sact.sa_mask = mask; 481 sact.sa_flags = SA_RESTART; 482 (void)sigaction(SIGHUP, &sact, NULL); 483 484 tvp = &tv; 485 tv.tv_sec = tv.tv_usec = 0; 486 487 for (;;) { 488 fd_set readfds; 489 int nfds = 0; 490 491 FD_ZERO(&readfds); 492 if (fklog != -1) { 493 FD_SET(fklog, &readfds); 494 if (fklog > nfds) 495 nfds = fklog; 496 } 497 if (finet && !SecureMode) { 498 for (i = 0; i < *finet; i++) { 499 FD_SET(finet[i+1], &readfds); 500 if (finet[i+1] > nfds) 501 nfds = finet[i+1]; 502 } 503 } 504 for (i = 0; i < nfunix; i++) { 505 if (funix[i] != -1) { 506 FD_SET(funix[i], &readfds); 507 if (funix[i] > nfds) 508 nfds = funix[i]; 509 } 510 } 511 512 /*dprintf("readfds = %#x\n", readfds);*/ 513 nfds = select(nfds+1, &readfds, (fd_set *)NULL, 514 (fd_set *)NULL, tvp); 515 if (nfds == 0) { 516 if (tvp) { 517 tvp = NULL; 518 if (ppid != 1) 519 kill(ppid, SIGALRM); 520 } 521 continue; 522 } 523 if (nfds < 0) { 524 if (errno != EINTR) 525 logerror("select"); 526 continue; 527 } 528 /*dprintf("got a message (%d, %#x)\n", nfds, readfds);*/ 529 if (fklog != -1 && FD_ISSET(fklog, &readfds)) 530 readklog(); 531 if (finet && !SecureMode) { 532 for (i = 0; i < *finet; i++) { 533 if (FD_ISSET(finet[i+1], &readfds)) { 534 len = sizeof(frominet); 535 l = recvfrom(finet[i+1], line, MAXLINE, 536 0, (struct sockaddr *)&frominet, 537 &len); 538 if (l > 0) { 539 line[l] = '\0'; 540 hname = cvthname((struct sockaddr *)&frominet); 541 unmapped((struct sockaddr *)&frominet); 542 if (validate((struct sockaddr *)&frominet, hname)) 543 printline(hname, line); 544 } else if (l < 0 && errno != EINTR) 545 logerror("recvfrom inet"); 546 } 547 } 548 } 549 for (i = 0; i < nfunix; i++) { 550 if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) { 551 len = sizeof(fromunix); 552 l = recvfrom(funix[i], line, MAXLINE, 0, 553 (struct sockaddr *)&fromunix, &len); 554 if (l > 0) { 555 line[l] = '\0'; 556 printline(LocalHostName, line); 557 } else if (l < 0 && errno != EINTR) 558 logerror("recvfrom unix"); 559 } 560 } 561 } 562} 563 564static void 565unmapped(sa) 566 struct sockaddr *sa; 567{ 568 struct sockaddr_in6 *sin6; 569 struct sockaddr_in sin; 570 571 if (sa->sa_family != AF_INET6) 572 return; 573 if (sa->sa_len != sizeof(struct sockaddr_in6) || 574 sizeof(sin) > sa->sa_len) 575 return; 576 sin6 = (struct sockaddr_in6 *)sa; 577 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 578 return; 579 580 memset(&sin, 0, sizeof(sin)); 581 sin.sin_family = AF_INET; 582 sin.sin_len = sizeof(struct sockaddr_in); 583 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 584 sizeof(sin.sin_addr)); 585 sin.sin_port = sin6->sin6_port; 586 587 memcpy(sa, &sin, sin.sin_len); 588} 589 590static void 591usage() 592{ 593 594 fprintf(stderr, "%s\n%s\n%s\n", 595 "usage: syslogd [-46Adnsuv] [-a allowed_peer] [-f config_file]", 596 " [-m mark_interval] [-l log_socket]", 597 " [-p log_socket] [-P pid_file]"); 598 exit(1); 599} 600 601/* 602 * Take a raw input line, decode the message, and print the message 603 * on the appropriate log files. 604 */ 605void 606printline(hname, msg) 607 char *hname; 608 char *msg; 609{ 610 int c, pri; 611 char *p, *q, line[MAXLINE + 1]; 612 613 /* test for special codes */ 614 pri = DEFUPRI; 615 p = msg; 616 if (*p == '<') { 617 pri = 0; 618 while (isdigit(*++p)) 619 pri = 10 * pri + (*p - '0'); 620 if (*p == '>') 621 ++p; 622 } 623 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 624 pri = DEFUPRI; 625 626 /* don't allow users to log kernel messages */ 627 if (LOG_FAC(pri) == LOG_KERN && !KeepKernFac) 628 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 629 630 q = line; 631 632 while ((c = (unsigned char)*p++) != '\0' && 633 q < &line[sizeof(line) - 4]) { 634 if ((c & 0x80) && c < 0xA0) { 635 c &= 0x7F; 636 *q++ = 'M'; 637 *q++ = '-'; 638 } 639 if (isascii(c) && iscntrl(c)) { 640 if (c == '\n') 641 *q++ = ' '; 642 else if (c == '\t') 643 *q++ = '\t'; 644 else { 645 *q++ = '^'; 646 *q++ = c ^ 0100; 647 } 648 } else 649 *q++ = c; 650 } 651 *q = '\0'; 652 653 logmsg(pri, line, hname, 0); 654} 655 656/* 657 * Read /dev/klog while data are available, split into lines. 658 */ 659void 660readklog() 661{ 662 char *p, *q, line[MAXLINE + 1]; 663 int len, i; 664 665 len = 0; 666 for (;;) { 667 i = read(fklog, line + len, MAXLINE - 1 - len); 668 if (i > 0) 669 line[i + len] = '\0'; 670 else if (i < 0 && errno != EINTR && errno != EAGAIN) { 671 logerror("klog"); 672 fklog = -1; 673 break; 674 } else 675 break; 676 677 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 678 *q = '\0'; 679 printsys(p); 680 } 681 len = strlen(p); 682 if (len >= MAXLINE - 1) { 683 printsys(p); 684 len = 0; 685 } 686 if (len > 0) 687 memmove(line, p, len + 1); 688 } 689 if (len > 0) 690 printsys(line); 691} 692 693/* 694 * Take a raw input line from /dev/klog, format similar to syslog(). 695 */ 696void 697printsys(p) 698 char *p; 699{ 700 int pri, flags; 701 702 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 703 pri = DEFSPRI; 704 if (*p == '<') { 705 pri = 0; 706 while (isdigit(*++p)) 707 pri = 10 * pri + (*p - '0'); 708 if (*p == '>') 709 ++p; 710 if ((pri & LOG_FACMASK) == LOG_CONSOLE) 711 flags |= IGN_CONS; 712 } else { 713 /* kernel printf's come out on console */ 714 flags |= IGN_CONS; 715 } 716 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 717 pri = DEFSPRI; 718 logmsg(pri, p, LocalHostName, flags); 719} 720 721time_t now; 722 723/* 724 * Log a message to the appropriate log files, users, etc. based on 725 * the priority. 726 */ 727void 728logmsg(pri, msg, from, flags) 729 int pri; 730 char *msg, *from; 731 int flags; 732{ 733 struct filed *f; 734 int i, fac, msglen, omask, prilev; 735 char *timestamp; 736 char prog[NAME_MAX+1]; 737 char buf[MAXLINE+1]; 738 739 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 740 pri, flags, from, msg); 741 742 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 743 744 /* 745 * Check to see if msg looks non-standard. 746 */ 747 msglen = strlen(msg); 748 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 749 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 750 flags |= ADDDATE; 751 752 (void)time(&now); 753 if (flags & ADDDATE) 754 timestamp = ctime(&now) + 4; 755 else { 756 timestamp = msg; 757 msg += 16; 758 msglen -= 16; 759 } 760 761 /* skip leading blanks */ 762 while (isspace(*msg)) { 763 msg++; 764 msglen--; 765 } 766 767 /* extract facility and priority level */ 768 if (flags & MARK) 769 fac = LOG_NFACILITIES; 770 else 771 fac = LOG_FAC(pri); 772 prilev = LOG_PRI(pri); 773 774 /* extract program name */ 775 for (i = 0; i < NAME_MAX; i++) { 776 if (!isalnum(msg[i])) 777 break; 778 prog[i] = msg[i]; 779 } 780 prog[i] = 0; 781 782 /* add kernel prefix for kernel messages */ 783 if (flags & ISKERNEL) { 784 snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg); 785 msg = buf; 786 msglen = strlen(buf); 787 } 788 789 /* log the message to the particular outputs */ 790 if (!Initialized) { 791 f = &consfile; 792 f->f_file = open(ctty, O_WRONLY, 0); 793 794 if (f->f_file >= 0) { 795 fprintlog(f, flags, msg); 796 (void)close(f->f_file); 797 } 798 (void)sigsetmask(omask); 799 return; 800 } 801 for (f = Files; f; f = f->f_next) { 802 /* skip messages that are incorrect priority */ 803 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 804 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 805 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 806 ) 807 || f->f_pmask[fac] == INTERNAL_NOPRI) 808 continue; 809 /* skip messages with the incorrect hostname */ 810 if (f->f_host) 811 switch (f->f_host[0]) { 812 case '+': 813 if (strcmp(from, f->f_host + 1) != 0) 814 continue; 815 break; 816 case '-': 817 if (strcmp(from, f->f_host + 1) == 0) 818 continue; 819 break; 820 } 821 822 /* skip messages with the incorrect program name */ 823 if (f->f_program) 824 if (strcmp(prog, f->f_program) != 0) 825 continue; 826 827 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 828 continue; 829 830 /* don't output marks to recently written files */ 831 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 832 continue; 833 834 /* 835 * suppress duplicate lines to this file 836 */ 837 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 838 !strcmp(msg, f->f_prevline) && 839 !strcasecmp(from, f->f_prevhost)) { 840 (void)strncpy(f->f_lasttime, timestamp, 15); 841 f->f_prevcount++; 842 dprintf("msg repeated %d times, %ld sec of %d\n", 843 f->f_prevcount, (long)(now - f->f_time), 844 repeatinterval[f->f_repeatcount]); 845 /* 846 * If domark would have logged this by now, 847 * flush it now (so we don't hold isolated messages), 848 * but back off so we'll flush less often 849 * in the future. 850 */ 851 if (now > REPEATTIME(f)) { 852 fprintlog(f, flags, (char *)NULL); 853 BACKOFF(f); 854 } 855 } else { 856 /* new line, save it */ 857 if (f->f_prevcount) 858 fprintlog(f, 0, (char *)NULL); 859 f->f_repeatcount = 0; 860 f->f_prevpri = pri; 861 (void)strncpy(f->f_lasttime, timestamp, 15); 862 (void)strncpy(f->f_prevhost, from, 863 sizeof(f->f_prevhost)-1); 864 f->f_prevhost[sizeof(f->f_prevhost)-1] = '\0'; 865 if (msglen < MAXSVLINE) { 866 f->f_prevlen = msglen; 867 (void)strcpy(f->f_prevline, msg); 868 fprintlog(f, flags, (char *)NULL); 869 } else { 870 f->f_prevline[0] = 0; 871 f->f_prevlen = 0; 872 fprintlog(f, flags, msg); 873 } 874 } 875 } 876 (void)sigsetmask(omask); 877} 878 879void 880fprintlog(f, flags, msg) 881 struct filed *f; 882 int flags; 883 char *msg; 884{ 885 struct iovec iov[7]; 886 struct iovec *v; 887 struct addrinfo *r; 888 int i, l, lsent = 0; 889 char line[MAXLINE + 1], repbuf[80], greetings[200]; 890 char *msgret; 891 892 v = iov; 893 if (f->f_type == F_WALL) { 894 v->iov_base = greetings; 895 v->iov_len = snprintf(greetings, sizeof greetings, 896 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 897 f->f_prevhost, ctime(&now)); 898 if (v->iov_len > 0) 899 v++; 900 v->iov_base = ""; 901 v->iov_len = 0; 902 v++; 903 } else { 904 v->iov_base = f->f_lasttime; 905 v->iov_len = 15; 906 v++; 907 v->iov_base = " "; 908 v->iov_len = 1; 909 v++; 910 } 911 912 if (LogFacPri) { 913 static char fp_buf[30]; /* Hollow laugh */ 914 int fac = f->f_prevpri & LOG_FACMASK; 915 int pri = LOG_PRI(f->f_prevpri); 916 const char *f_s = NULL; 917 char f_n[5]; /* Hollow laugh */ 918 const char *p_s = NULL; 919 char p_n[5]; /* Hollow laugh */ 920 921 if (LogFacPri > 1) { 922 CODE *c; 923 924 for (c = facilitynames; c->c_name; c++) { 925 if (c->c_val == fac) { 926 f_s = c->c_name; 927 break; 928 } 929 } 930 for (c = prioritynames; c->c_name; c++) { 931 if (c->c_val == pri) { 932 p_s = c->c_name; 933 break; 934 } 935 } 936 } 937 if (!f_s) { 938 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 939 f_s = f_n; 940 } 941 if (!p_s) { 942 snprintf(p_n, sizeof p_n, "%d", pri); 943 p_s = p_n; 944 } 945 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 946 v->iov_base = fp_buf; 947 v->iov_len = strlen(fp_buf); 948 } else { 949 v->iov_base=""; 950 v->iov_len = 0; 951 } 952 v++; 953 954 v->iov_base = f->f_prevhost; 955 v->iov_len = strlen(v->iov_base); 956 v++; 957 v->iov_base = " "; 958 v->iov_len = 1; 959 v++; 960 961 if (msg) { 962 v->iov_base = msg; 963 v->iov_len = strlen(msg); 964 } else if (f->f_prevcount > 1) { 965 v->iov_base = repbuf; 966 v->iov_len = sprintf(repbuf, "last message repeated %d times", 967 f->f_prevcount); 968 } else { 969 v->iov_base = f->f_prevline; 970 v->iov_len = f->f_prevlen; 971 } 972 v++; 973 974 dprintf("Logging to %s", TypeNames[f->f_type]); 975 f->f_time = now; 976 977 switch (f->f_type) { 978 case F_UNUSED: 979 dprintf("\n"); 980 break; 981 982 case F_FORW: 983 dprintf(" %s\n", f->f_un.f_forw.f_hname); 984 /* check for local vs remote messages */ 985 if (strcasecmp(f->f_prevhost, LocalHostName)) 986 l = snprintf(line, sizeof line - 1, 987 "<%d>%.15s Forwarded from %s: %s", 988 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 989 iov[5].iov_base); 990 else 991 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 992 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 993 if (l < 0) 994 l = 0; 995 else if (l > MAXLINE) 996 l = MAXLINE; 997 998 if (finet) { 999 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1000 for (i = 0; i < *finet; i++) { 1001#if 0 1002 /* 1003 * should we check AF first, or just 1004 * trial and error? FWD 1005 */ 1006 if (r->ai_family == 1007 address_family_of(finet[i+1])) 1008#endif 1009 lsent = sendto(finet[i+1], line, l, 0, 1010 r->ai_addr, r->ai_addrlen); 1011 if (lsent == l) 1012 break; 1013 } 1014 if (lsent == l && !send_to_all) 1015 break; 1016 } 1017 if (lsent != l) { 1018 int e = errno; 1019 (void)close(f->f_file); 1020 errno = e; 1021 f->f_type = F_UNUSED; 1022 logerror("sendto"); 1023 } 1024 } 1025 break; 1026 1027 case F_FILE: 1028 dprintf(" %s\n", f->f_un.f_fname); 1029 v->iov_base = "\n"; 1030 v->iov_len = 1; 1031 if (writev(f->f_file, iov, 7) < 0) { 1032 int e = errno; 1033 (void)close(f->f_file); 1034 f->f_type = F_UNUSED; 1035 errno = e; 1036 logerror(f->f_un.f_fname); 1037 } else if (flags & SYNC_FILE) 1038 (void)fsync(f->f_file); 1039 break; 1040 1041 case F_PIPE: 1042 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1043 v->iov_base = "\n"; 1044 v->iov_len = 1; 1045 if (f->f_un.f_pipe.f_pid == 0) { 1046 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1047 &f->f_un.f_pipe.f_pid)) < 0) { 1048 f->f_type = F_UNUSED; 1049 logerror(f->f_un.f_pipe.f_pname); 1050 break; 1051 } 1052 } 1053 if (writev(f->f_file, iov, 7) < 0) { 1054 int e = errno; 1055 (void)close(f->f_file); 1056 if (f->f_un.f_pipe.f_pid > 0) 1057 deadq_enter(f->f_un.f_pipe.f_pid, 1058 f->f_un.f_pipe.f_pname); 1059 f->f_un.f_pipe.f_pid = 0; 1060 errno = e; 1061 logerror(f->f_un.f_pipe.f_pname); 1062 } 1063 break; 1064 1065 case F_CONSOLE: 1066 if (flags & IGN_CONS) { 1067 dprintf(" (ignored)\n"); 1068 break; 1069 } 1070 /* FALLTHROUGH */ 1071 1072 case F_TTY: 1073 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1074 v->iov_base = "\r\n"; 1075 v->iov_len = 2; 1076 1077 errno = 0; /* ttymsg() only sometimes returns an errno */ 1078 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1079 f->f_type = F_UNUSED; 1080 logerror(msgret); 1081 } 1082 break; 1083 1084 case F_USERS: 1085 case F_WALL: 1086 dprintf("\n"); 1087 v->iov_base = "\r\n"; 1088 v->iov_len = 2; 1089 wallmsg(f, iov); 1090 break; 1091 } 1092 f->f_prevcount = 0; 1093} 1094 1095/* 1096 * WALLMSG -- Write a message to the world at large 1097 * 1098 * Write the specified message to either the entire 1099 * world, or a list of approved users. 1100 */ 1101void 1102wallmsg(f, iov) 1103 struct filed *f; 1104 struct iovec *iov; 1105{ 1106 static int reenter; /* avoid calling ourselves */ 1107 FILE *uf; 1108 struct utmp ut; 1109 int i; 1110 char *p; 1111 char line[sizeof(ut.ut_line) + 1]; 1112 1113 if (reenter++) 1114 return; 1115 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1116 logerror(_PATH_UTMP); 1117 reenter = 0; 1118 return; 1119 } 1120 /* NOSTRICT */ 1121 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1122 if (ut.ut_name[0] == '\0') 1123 continue; 1124 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 1125 line[sizeof(ut.ut_line)] = '\0'; 1126 if (f->f_type == F_WALL) { 1127 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1128 errno = 0; /* already in msg */ 1129 logerror(p); 1130 } 1131 continue; 1132 } 1133 /* should we send the message to this user? */ 1134 for (i = 0; i < MAXUNAMES; i++) { 1135 if (!f->f_un.f_uname[i][0]) 1136 break; 1137 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1138 UT_NAMESIZE)) { 1139 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1140 != NULL) { 1141 errno = 0; /* already in msg */ 1142 logerror(p); 1143 } 1144 break; 1145 } 1146 } 1147 } 1148 (void)fclose(uf); 1149 reenter = 0; 1150} 1151 1152void 1153reapchild(signo) 1154 int signo; 1155{ 1156 int status; 1157 pid_t pid; 1158 struct filed *f; 1159 1160 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1161 if (!Initialized) 1162 /* Don't tell while we are initting. */ 1163 continue; 1164 1165 /* First, look if it's a process from the dead queue. */ 1166 if (deadq_remove(pid)) 1167 goto oncemore; 1168 1169 /* Now, look in list of active processes. */ 1170 for (f = Files; f; f = f->f_next) 1171 if (f->f_type == F_PIPE && 1172 f->f_un.f_pipe.f_pid == pid) { 1173 (void)close(f->f_file); 1174 f->f_un.f_pipe.f_pid = 0; 1175 log_deadchild(pid, status, 1176 f->f_un.f_pipe.f_pname); 1177 break; 1178 } 1179 oncemore: 1180 continue; 1181 } 1182} 1183 1184/* 1185 * Return a printable representation of a host address. 1186 */ 1187char * 1188cvthname(f) 1189 struct sockaddr *f; 1190{ 1191 int error; 1192 sigset_t omask, nmask; 1193 char *p; 1194 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1195 1196 error = getnameinfo((struct sockaddr *)f, 1197 ((struct sockaddr *)f)->sa_len, 1198 ip, sizeof ip, NULL, 0, 1199 NI_NUMERICHOST | withscopeid); 1200 dprintf("cvthname(%s)\n", ip); 1201 1202 if (error) { 1203 dprintf("Malformed from address %s\n", gai_strerror(error)); 1204 return ("???"); 1205 } 1206 if (!resolve) 1207 return (ip); 1208 1209 sigemptyset(&nmask); 1210 sigaddset(&nmask, SIGHUP); 1211 sigprocmask(SIG_BLOCK, &nmask, &omask); 1212 error = getnameinfo((struct sockaddr *)f, 1213 ((struct sockaddr *)f)->sa_len, 1214 hname, sizeof hname, NULL, 0, 1215 NI_NAMEREQD | withscopeid); 1216 sigprocmask(SIG_SETMASK, &omask, NULL); 1217 if (error) { 1218 dprintf("Host name for your address (%s) unknown\n", ip); 1219 return (ip); 1220 } 1221 if ((p = strchr(hname, '.')) && strcasecmp(p + 1, LocalDomain) == 0) 1222 *p = '\0'; 1223 return (hname); 1224} 1225 1226void 1227domark(signo) 1228 int signo; 1229{ 1230 struct filed *f; 1231 dq_t q; 1232 1233 now = time((time_t *)NULL); 1234 MarkSeq += TIMERINTVL; 1235 if (MarkSeq >= MarkInterval) { 1236 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 1237 MarkSeq = 0; 1238 } 1239 1240 for (f = Files; f; f = f->f_next) { 1241 if (f->f_prevcount && now >= REPEATTIME(f)) { 1242 dprintf("flush %s: repeated %d times, %d sec.\n", 1243 TypeNames[f->f_type], f->f_prevcount, 1244 repeatinterval[f->f_repeatcount]); 1245 fprintlog(f, 0, (char *)NULL); 1246 BACKOFF(f); 1247 } 1248 } 1249 1250 /* Walk the dead queue, and see if we should signal somebody. */ 1251 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1252 switch (q->dq_timeout) { 1253 case 0: 1254 /* Already signalled once, try harder now. */ 1255 if (kill(q->dq_pid, SIGKILL) != 0) 1256 (void)deadq_remove(q->dq_pid); 1257 break; 1258 1259 case 1: 1260 /* 1261 * Timed out on dead queue, send terminate 1262 * signal. Note that we leave the removal 1263 * from the dead queue to reapchild(), which 1264 * will also log the event (unless the process 1265 * didn't even really exist, in case we simply 1266 * drop it from the dead queue). 1267 */ 1268 if (kill(q->dq_pid, SIGTERM) != 0) 1269 (void)deadq_remove(q->dq_pid); 1270 /* FALLTHROUGH */ 1271 1272 default: 1273 q->dq_timeout--; 1274 } 1275 1276 (void)alarm(TIMERINTVL); 1277} 1278 1279/* 1280 * Print syslogd errors some place. 1281 */ 1282void 1283logerror(type) 1284 const char *type; 1285{ 1286 char buf[512]; 1287 1288 if (errno) 1289 (void)snprintf(buf, 1290 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1291 else 1292 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1293 errno = 0; 1294 dprintf("%s\n", buf); 1295 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1296} 1297 1298void 1299die(signo) 1300 int signo; 1301{ 1302 struct filed *f; 1303 int was_initialized; 1304 char buf[100]; 1305 int i; 1306 1307 was_initialized = Initialized; 1308 Initialized = 0; /* Don't log SIGCHLDs. */ 1309 for (f = Files; f != NULL; f = f->f_next) { 1310 /* flush any pending output */ 1311 if (f->f_prevcount) 1312 fprintlog(f, 0, (char *)NULL); 1313 if (f->f_type == F_PIPE) 1314 (void)close(f->f_file); 1315 } 1316 Initialized = was_initialized; 1317 if (signo) { 1318 dprintf("syslogd: exiting on signal %d\n", signo); 1319 (void)sprintf(buf, "exiting on signal %d", signo); 1320 errno = 0; 1321 logerror(buf); 1322 } 1323 for (i = 0; i < nfunix; i++) 1324 if (funixn[i] && funix[i] != -1) 1325 (void)unlink(funixn[i]); 1326 exit(1); 1327} 1328 1329/* 1330 * INIT -- Initialize syslogd from configuration table 1331 */ 1332void 1333init(signo) 1334 int signo; 1335{ 1336 int i; 1337 FILE *cf; 1338 struct filed *f, *next, **nextp; 1339 char *p; 1340 char cline[LINE_MAX]; 1341 char prog[NAME_MAX+1]; 1342 char host[MAXHOSTNAMELEN]; 1343 char oldLocalHostName[MAXHOSTNAMELEN]; 1344 char hostMsg[2*MAXHOSTNAMELEN+40]; 1345 1346 dprintf("init\n"); 1347 1348 /* 1349 * Load hostname (may have changed). 1350 */ 1351 if (signo != 0) 1352 (void)strlcpy(oldLocalHostName, LocalHostName, 1353 sizeof(oldLocalHostName)); 1354 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1355 err(EX_OSERR, "gethostname() failed"); 1356 if ((p = strchr(LocalHostName, '.')) != NULL) { 1357 *p++ = '\0'; 1358 LocalDomain = p; 1359 } else 1360 LocalDomain = ""; 1361 1362 /* 1363 * Close all open log files. 1364 */ 1365 Initialized = 0; 1366 for (f = Files; f != NULL; f = next) { 1367 /* flush any pending output */ 1368 if (f->f_prevcount) 1369 fprintlog(f, 0, (char *)NULL); 1370 1371 switch (f->f_type) { 1372 case F_FILE: 1373 case F_FORW: 1374 case F_CONSOLE: 1375 case F_TTY: 1376 (void)close(f->f_file); 1377 break; 1378 case F_PIPE: 1379 (void)close(f->f_file); 1380 if (f->f_un.f_pipe.f_pid > 0) 1381 deadq_enter(f->f_un.f_pipe.f_pid, 1382 f->f_un.f_pipe.f_pname); 1383 f->f_un.f_pipe.f_pid = 0; 1384 break; 1385 } 1386 next = f->f_next; 1387 if (f->f_program) free(f->f_program); 1388 if (f->f_host) free(f->f_host); 1389 free((char *)f); 1390 } 1391 Files = NULL; 1392 nextp = &Files; 1393 1394 /* open the configuration file */ 1395 if ((cf = fopen(ConfFile, "r")) == NULL) { 1396 dprintf("cannot open %s\n", ConfFile); 1397 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1398 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1399 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1400 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1401 Initialized = 1; 1402 return; 1403 } 1404 1405 /* 1406 * Foreach line in the conf table, open that file. 1407 */ 1408 f = NULL; 1409 strcpy(host, "*"); 1410 strcpy(prog, "*"); 1411 while (fgets(cline, sizeof(cline), cf) != NULL) { 1412 /* 1413 * check for end-of-section, comments, strip off trailing 1414 * spaces and newline character. #!prog is treated specially: 1415 * following lines apply only to that program. 1416 */ 1417 for (p = cline; isspace(*p); ++p) 1418 continue; 1419 if (*p == 0) 1420 continue; 1421 if (*p == '#') { 1422 p++; 1423 if (*p != '!' && *p != '+' && *p != '-') 1424 continue; 1425 } 1426 if (*p == '+' || *p == '-') { 1427 host[0] = *p++; 1428 while (isspace(*p)) p++; 1429 if ((!*p) || (*p == '*')) { 1430 strcpy(host, "*"); 1431 continue; 1432 } 1433 if (*p == '@') 1434 p = LocalHostName; 1435 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1436 if (!isalnum(*p) && *p != '.' && *p != '-') 1437 break; 1438 host[i] = *p++; 1439 } 1440 host[i] = '\0'; 1441 continue; 1442 } 1443 if (*p == '!') { 1444 p++; 1445 while (isspace(*p)) p++; 1446 if ((!*p) || (*p == '*')) { 1447 strcpy(prog, "*"); 1448 continue; 1449 } 1450 for (i = 0; i < NAME_MAX; i++) { 1451 if (!isalnum(p[i])) 1452 break; 1453 prog[i] = p[i]; 1454 } 1455 prog[i] = 0; 1456 continue; 1457 } 1458 for (p = strchr(cline, '\0'); isspace(*--p);) 1459 continue; 1460 *++p = '\0'; 1461 f = (struct filed *)calloc(1, sizeof(*f)); 1462 *nextp = f; 1463 nextp = &f->f_next; 1464 cfline(cline, f, prog, host); 1465 } 1466 1467 /* close the configuration file */ 1468 (void)fclose(cf); 1469 1470 Initialized = 1; 1471 1472 if (Debug) { 1473 for (f = Files; f; f = f->f_next) { 1474 for (i = 0; i <= LOG_NFACILITIES; i++) 1475 if (f->f_pmask[i] == INTERNAL_NOPRI) 1476 printf("X "); 1477 else 1478 printf("%d ", f->f_pmask[i]); 1479 printf("%s: ", TypeNames[f->f_type]); 1480 switch (f->f_type) { 1481 case F_FILE: 1482 printf("%s", f->f_un.f_fname); 1483 break; 1484 1485 case F_CONSOLE: 1486 case F_TTY: 1487 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1488 break; 1489 1490 case F_FORW: 1491 printf("%s", f->f_un.f_forw.f_hname); 1492 break; 1493 1494 case F_PIPE: 1495 printf("%s", f->f_un.f_pipe.f_pname); 1496 break; 1497 1498 case F_USERS: 1499 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1500 printf("%s, ", f->f_un.f_uname[i]); 1501 break; 1502 } 1503 if (f->f_program) 1504 printf(" (%s)", f->f_program); 1505 printf("\n"); 1506 } 1507 } 1508 1509 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1510 dprintf("syslogd: restarted\n"); 1511 /* 1512 * Log a change in hostname, but only on a restart. 1513 */ 1514 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1515 (void)snprintf(hostMsg, sizeof(hostMsg), 1516 "syslogd: hostname changed, \"%s\" to \"%s\"", 1517 oldLocalHostName, LocalHostName); 1518 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1519 dprintf("%s\n", hostMsg); 1520 } 1521} 1522 1523/* 1524 * Crack a configuration file line 1525 */ 1526void 1527cfline(line, f, prog, host) 1528 char *line; 1529 struct filed *f; 1530 char *prog; 1531 char *host; 1532{ 1533 struct addrinfo hints, *res; 1534 int error, i, pri; 1535 char *bp, *p, *q; 1536 char buf[MAXLINE], ebuf[100]; 1537 1538 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1539 1540 errno = 0; /* keep strerror() stuff out of logerror messages */ 1541 1542 /* clear out file entry */ 1543 memset(f, 0, sizeof(*f)); 1544 for (i = 0; i <= LOG_NFACILITIES; i++) 1545 f->f_pmask[i] = INTERNAL_NOPRI; 1546 1547 /* save hostname if any */ 1548 if (host && *host == '*') 1549 host = NULL; 1550 if (host) 1551 f->f_host = strdup(host); 1552 1553 /* save program name if any */ 1554 if (prog && *prog == '*') 1555 prog = NULL; 1556 if (prog) 1557 f->f_program = strdup(prog); 1558 1559 /* scan through the list of selectors */ 1560 for (p = line; *p && *p != '\t' && *p != ' ';) { 1561 int pri_done; 1562 int pri_cmp; 1563 1564 /* find the end of this facility name list */ 1565 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1566 continue; 1567 1568 /* get the priority comparison */ 1569 pri_cmp = 0; 1570 pri_done = 0; 1571 while (!pri_done) { 1572 switch (*q) { 1573 case '<': 1574 pri_cmp |= PRI_LT; 1575 q++; 1576 break; 1577 case '=': 1578 pri_cmp |= PRI_EQ; 1579 q++; 1580 break; 1581 case '>': 1582 pri_cmp |= PRI_GT; 1583 q++; 1584 break; 1585 default: 1586 pri_done++; 1587 break; 1588 } 1589 } 1590 if (!pri_cmp) 1591 pri_cmp = (UniquePriority) 1592 ? (PRI_EQ) 1593 : (PRI_EQ | PRI_GT) 1594 ; 1595 1596 /* collect priority name */ 1597 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1598 *bp++ = *q++; 1599 *bp = '\0'; 1600 1601 /* skip cruft */ 1602 while (strchr(",;", *q)) 1603 q++; 1604 1605 /* decode priority name */ 1606 if (*buf == '*') 1607 pri = LOG_PRIMASK + 1; 1608 else { 1609 pri = decode(buf, prioritynames); 1610 if (pri < 0) { 1611 (void)snprintf(ebuf, sizeof ebuf, 1612 "unknown priority name \"%s\"", buf); 1613 logerror(ebuf); 1614 return; 1615 } 1616 } 1617 1618 /* scan facilities */ 1619 while (*p && !strchr("\t.; ", *p)) { 1620 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1621 *bp++ = *p++; 1622 *bp = '\0'; 1623 1624 if (*buf == '*') 1625 for (i = 0; i < LOG_NFACILITIES; i++) { 1626 f->f_pmask[i] = pri; 1627 f->f_pcmp[i] = pri_cmp; 1628 } 1629 else { 1630 i = decode(buf, facilitynames); 1631 if (i < 0) { 1632 (void)snprintf(ebuf, sizeof ebuf, 1633 "unknown facility name \"%s\"", 1634 buf); 1635 logerror(ebuf); 1636 return; 1637 } 1638 f->f_pmask[i >> 3] = pri; 1639 f->f_pcmp[i >> 3] = pri_cmp; 1640 } 1641 while (*p == ',' || *p == ' ') 1642 p++; 1643 } 1644 1645 p = q; 1646 } 1647 1648 /* skip to action part */ 1649 while (*p == '\t' || *p == ' ') 1650 p++; 1651 1652 switch (*p) 1653 { 1654 case '@': 1655 (void)strncpy(f->f_un.f_forw.f_hname, ++p, 1656 sizeof(f->f_un.f_forw.f_hname)-1); 1657 f->f_un.f_forw.f_hname[sizeof(f->f_un.f_forw.f_hname)-1] = '\0'; 1658 memset(&hints, 0, sizeof(hints)); 1659 hints.ai_family = family; 1660 hints.ai_socktype = SOCK_DGRAM; 1661 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1662 &res); 1663 if (error) { 1664 logerror(gai_strerror(error)); 1665 break; 1666 } 1667 f->f_un.f_forw.f_addr = res; 1668 f->f_type = F_FORW; 1669 break; 1670 1671 case '/': 1672 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1673 f->f_type = F_UNUSED; 1674 logerror(p); 1675 break; 1676 } 1677 if (isatty(f->f_file)) { 1678 if (strcmp(p, ctty) == 0) 1679 f->f_type = F_CONSOLE; 1680 else 1681 f->f_type = F_TTY; 1682 (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); 1683 } else { 1684 (void)strcpy(f->f_un.f_fname, p); 1685 f->f_type = F_FILE; 1686 } 1687 break; 1688 1689 case '|': 1690 f->f_un.f_pipe.f_pid = 0; 1691 (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); 1692 f->f_type = F_PIPE; 1693 break; 1694 1695 case '*': 1696 f->f_type = F_WALL; 1697 break; 1698 1699 default: 1700 for (i = 0; i < MAXUNAMES && *p; i++) { 1701 for (q = p; *q && *q != ','; ) 1702 q++; 1703 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1704 if ((q - p) > UT_NAMESIZE) 1705 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1706 else 1707 f->f_un.f_uname[i][q - p] = '\0'; 1708 while (*q == ',' || *q == ' ') 1709 q++; 1710 p = q; 1711 } 1712 f->f_type = F_USERS; 1713 break; 1714 } 1715} 1716 1717 1718/* 1719 * Decode a symbolic name to a numeric value 1720 */ 1721int 1722decode(name, codetab) 1723 const char *name; 1724 CODE *codetab; 1725{ 1726 CODE *c; 1727 char *p, buf[40]; 1728 1729 if (isdigit(*name)) 1730 return (atoi(name)); 1731 1732 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1733 if (isupper(*name)) 1734 *p = tolower(*name); 1735 else 1736 *p = *name; 1737 } 1738 *p = '\0'; 1739 for (c = codetab; c->c_name; c++) 1740 if (!strcmp(buf, c->c_name)) 1741 return (c->c_val); 1742 1743 return (-1); 1744} 1745 1746/* 1747 * fork off and become a daemon, but wait for the child to come online 1748 * before returing to the parent, or we get disk thrashing at boot etc. 1749 * Set a timer so we don't hang forever if it wedges. 1750 */ 1751int 1752waitdaemon(nochdir, noclose, maxwait) 1753 int nochdir, noclose, maxwait; 1754{ 1755 int fd; 1756 int status; 1757 pid_t pid, childpid; 1758 1759 switch (childpid = fork()) { 1760 case -1: 1761 return (-1); 1762 case 0: 1763 break; 1764 default: 1765 signal(SIGALRM, timedout); 1766 alarm(maxwait); 1767 while ((pid = wait3(&status, 0, NULL)) != -1) { 1768 if (WIFEXITED(status)) 1769 errx(1, "child pid %d exited with return code %d", 1770 pid, WEXITSTATUS(status)); 1771 if (WIFSIGNALED(status)) 1772 errx(1, "child pid %d exited on signal %d%s", 1773 pid, WTERMSIG(status), 1774 WCOREDUMP(status) ? " (core dumped)" : 1775 ""); 1776 if (pid == childpid) /* it's gone... */ 1777 break; 1778 } 1779 exit(0); 1780 } 1781 1782 if (setsid() == -1) 1783 return (-1); 1784 1785 if (!nochdir) 1786 (void)chdir("/"); 1787 1788 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1789 (void)dup2(fd, STDIN_FILENO); 1790 (void)dup2(fd, STDOUT_FILENO); 1791 (void)dup2(fd, STDERR_FILENO); 1792 if (fd > 2) 1793 (void)close (fd); 1794 } 1795 return (getppid()); 1796} 1797 1798/* 1799 * We get a SIGALRM from the child when it's running and finished doing it's 1800 * fsync()'s or O_SYNC writes for all the boot messages. 1801 * 1802 * We also get a signal from the kernel if the timer expires, so check to 1803 * see what happened. 1804 */ 1805void 1806timedout(sig) 1807 int sig __unused; 1808{ 1809 int left; 1810 left = alarm(0); 1811 signal(SIGALRM, SIG_DFL); 1812 if (left == 0) 1813 errx(1, "timed out waiting for child"); 1814 else 1815 exit(0); 1816} 1817 1818/* 1819 * Add `s' to the list of allowable peer addresses to accept messages 1820 * from. 1821 * 1822 * `s' is a string in the form: 1823 * 1824 * [*]domainname[:{servicename|portnumber|*}] 1825 * 1826 * or 1827 * 1828 * netaddr/maskbits[:{servicename|portnumber|*}] 1829 * 1830 * Returns -1 on error, 0 if the argument was valid. 1831 */ 1832int 1833allowaddr(s) 1834 char *s; 1835{ 1836 char *cp1, *cp2; 1837 struct allowedpeer ap; 1838 struct servent *se; 1839 int masklen = -1, i; 1840 struct addrinfo hints, *res; 1841 struct in_addr *addrp, *maskp; 1842 u_int32_t *addr6p, *mask6p; 1843 char ip[NI_MAXHOST]; 1844 1845#ifdef INET6 1846 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 1847#endif 1848 cp1 = s; 1849 if ((cp1 = strrchr(cp1, ':'))) { 1850 /* service/port provided */ 1851 *cp1++ = '\0'; 1852 if (strlen(cp1) == 1 && *cp1 == '*') 1853 /* any port allowed */ 1854 ap.port = 0; 1855 else if ((se = getservbyname(cp1, "udp"))) 1856 ap.port = ntohs(se->s_port); 1857 else { 1858 ap.port = strtol(cp1, &cp2, 0); 1859 if (*cp2 != '\0') 1860 return -1; /* port not numeric */ 1861 } 1862 } else { 1863 if ((se = getservbyname("syslog", "udp"))) 1864 ap.port = ntohs(se->s_port); 1865 else 1866 /* sanity, should not happen */ 1867 ap.port = 514; 1868 } 1869 1870 if ((cp1 = strchr(s, '/')) != NULL && 1871 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 1872 *cp1 = '\0'; 1873 if ((masklen = atoi(cp1 + 1)) < 0) 1874 return -1; 1875 } 1876#ifdef INET6 1877 if (*s == '[') { 1878 cp2 = s + strlen(s) - 1; 1879 if (*cp2 == ']') { 1880 ++s; 1881 *cp2 = '\0'; 1882 } else 1883 cp2 = NULL; 1884 } else 1885 cp2 = NULL; 1886#endif 1887 memset(&hints, 0, sizeof(hints)); 1888 hints.ai_family = PF_UNSPEC; 1889 hints.ai_socktype = SOCK_DGRAM; 1890 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 1891 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 1892 ap.isnumeric = 1; 1893 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 1894 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 1895 ap.a_mask.ss_family = res->ai_family; 1896 if (res->ai_family == AF_INET) { 1897 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 1898 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 1899 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 1900 if (masklen < 0) { 1901 /* use default netmask */ 1902 if (IN_CLASSA(ntohl(addrp->s_addr))) 1903 maskp->s_addr = htonl(IN_CLASSA_NET); 1904 else if (IN_CLASSB(ntohl(addrp->s_addr))) 1905 maskp->s_addr = htonl(IN_CLASSB_NET); 1906 else 1907 maskp->s_addr = htonl(IN_CLASSC_NET); 1908 } else if (masklen <= 32) { 1909 /* convert masklen to netmask */ 1910 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 1911 } else { 1912 freeaddrinfo(res); 1913 return -1; 1914 } 1915 /* Lose any host bits in the network number. */ 1916 addrp->s_addr &= maskp->s_addr; 1917 } 1918#ifdef INET6 1919 else if (res->ai_family == AF_INET6 && masklen <= 128) { 1920 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 1921 if (masklen < 0) 1922 masklen = 128; 1923 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 1924 /* convert masklen to netmask */ 1925 while (masklen > 0) { 1926 if (masklen < 32) { 1927 *mask6p = htonl(~(0xffffffff >> masklen)); 1928 break; 1929 } 1930 *mask6p++ = 0xffffffff; 1931 masklen -= 32; 1932 } 1933 /* Lose any host bits in the network number. */ 1934 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 1935 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 1936 for (i = 0; i < 4; i++) 1937 addr6p[i] &= mask6p[i]; 1938 } 1939#endif 1940 else { 1941 freeaddrinfo(res); 1942 return -1; 1943 } 1944 freeaddrinfo(res); 1945 } else { 1946 /* arg `s' is domain name */ 1947 ap.isnumeric = 0; 1948 ap.a_name = s; 1949 if (cp1) 1950 *cp1 = '/'; 1951#ifdef INET6 1952 if (cp2) { 1953 *cp2 = ']'; 1954 --s; 1955 } 1956#endif 1957 } 1958 1959 if (Debug) { 1960 printf("allowaddr: rule %d: ", NumAllowed); 1961 if (ap.isnumeric) { 1962 printf("numeric, "); 1963 getnameinfo((struct sockaddr *)&ap.a_addr, 1964 ((struct sockaddr *)&ap.a_addr)->sa_len, 1965 ip, sizeof ip, NULL, 0, 1966 NI_NUMERICHOST | withscopeid); 1967 printf("addr = %s, ", ip); 1968 getnameinfo((struct sockaddr *)&ap.a_mask, 1969 ((struct sockaddr *)&ap.a_mask)->sa_len, 1970 ip, sizeof ip, NULL, 0, 1971 NI_NUMERICHOST | withscopeid); 1972 printf("mask = %s; ", ip); 1973 } else 1974 printf("domainname = %s; ", ap.a_name); 1975 printf("port = %d\n", ap.port); 1976 } 1977 1978 if ((AllowedPeers = realloc(AllowedPeers, 1979 ++NumAllowed * sizeof(struct allowedpeer))) 1980 == NULL) { 1981 fprintf(stderr, "Out of memory!\n"); 1982 exit(EX_OSERR); 1983 } 1984 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 1985 return 0; 1986} 1987 1988/* 1989 * Validate that the remote peer has permission to log to us. 1990 */ 1991int 1992validate(sa, hname) 1993 struct sockaddr *sa; 1994 const char *hname; 1995{ 1996 int i, j, reject; 1997 size_t l1, l2; 1998 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 1999 struct allowedpeer *ap; 2000 struct sockaddr_in *sin, *a4p = NULL, *m4p = NULL; 2001 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2002 struct addrinfo hints, *res; 2003 u_short sport; 2004 2005 if (NumAllowed == 0) 2006 /* traditional behaviour, allow everything */ 2007 return 1; 2008 2009 strlcpy(name, hname, sizeof name); 2010 memset(&hints, 0, sizeof(hints)); 2011 hints.ai_family = PF_UNSPEC; 2012 hints.ai_socktype = SOCK_DGRAM; 2013 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2014 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2015 freeaddrinfo(res); 2016 else if (strchr(name, '.') == NULL) { 2017 strlcat(name, ".", sizeof name); 2018 strlcat(name, LocalDomain, sizeof name); 2019 } 2020 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2021 NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0) 2022 return 0; /* for safety, should not occur */ 2023 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2024 ip, port, name); 2025 sport = atoi(port); 2026 2027 /* now, walk down the list */ 2028 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2029 if (ap->port != 0 && ap->port != sport) { 2030 dprintf("rejected in rule %d due to port mismatch.\n", i); 2031 continue; 2032 } 2033 2034 if (ap->isnumeric) { 2035 if (ap->a_addr.ss_family != sa->sa_family) { 2036 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2037 continue; 2038 } 2039 if (ap->a_addr.ss_family == AF_INET) { 2040 sin = (struct sockaddr_in *)sa; 2041 a4p = (struct sockaddr_in *)&ap->a_addr; 2042 m4p = (struct sockaddr_in *)&ap->a_mask; 2043 if ((sin->sin_addr.s_addr & m4p->sin_addr.s_addr) 2044 != a4p->sin_addr.s_addr) { 2045 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2046 continue; 2047 } 2048 } 2049#ifdef INET6 2050 else if (ap->a_addr.ss_family == AF_INET6) { 2051 sin6 = (struct sockaddr_in6 *)sa; 2052 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2053 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2054#ifdef NI_WITHSCOPEID 2055 if (a6p->sin6_scope_id != 0 && 2056 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2057 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2058 continue; 2059 } 2060#endif 2061 reject = 0; 2062 for (j = 0; j < 16; j += 4) { 2063 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2064 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2065 ++reject; 2066 break; 2067 } 2068 } 2069 if (reject) { 2070 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2071 continue; 2072 } 2073 } 2074#endif 2075 else 2076 continue; 2077 } else { 2078 cp = ap->a_name; 2079 l1 = strlen(name); 2080 if (*cp == '*') { 2081 /* allow wildmatch */ 2082 cp++; 2083 l2 = strlen(cp); 2084 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2085 dprintf("rejected in rule %d due to name mismatch.\n", i); 2086 continue; 2087 } 2088 } else { 2089 /* exact match */ 2090 l2 = strlen(cp); 2091 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2092 dprintf("rejected in rule %d due to name mismatch.\n", i); 2093 continue; 2094 } 2095 } 2096 } 2097 dprintf("accepted in rule %d.\n", i); 2098 return 1; /* hooray! */ 2099 } 2100 return 0; 2101} 2102 2103/* 2104 * Fairly similar to popen(3), but returns an open descriptor, as 2105 * opposed to a FILE *. 2106 */ 2107int 2108p_open(prog, pid) 2109 char *prog; 2110 pid_t *pid; 2111{ 2112 int pfd[2], nulldesc, i; 2113 sigset_t omask, mask; 2114 char *argv[4]; /* sh -c cmd NULL */ 2115 char errmsg[200]; 2116 2117 if (pipe(pfd) == -1) 2118 return -1; 2119 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2120 /* we are royally screwed anyway */ 2121 return -1; 2122 2123 sigemptyset(&mask); 2124 sigaddset(&mask, SIGALRM); 2125 sigaddset(&mask, SIGHUP); 2126 sigprocmask(SIG_BLOCK, &mask, &omask); 2127 switch ((*pid = fork())) { 2128 case -1: 2129 sigprocmask(SIG_SETMASK, &omask, 0); 2130 close(nulldesc); 2131 return -1; 2132 2133 case 0: 2134 argv[0] = "sh"; 2135 argv[1] = "-c"; 2136 argv[2] = prog; 2137 argv[3] = NULL; 2138 2139 alarm(0); 2140 (void)setsid(); /* Avoid catching SIGHUPs. */ 2141 2142 /* 2143 * Throw away pending signals, and reset signal 2144 * behaviour to standard values. 2145 */ 2146 signal(SIGALRM, SIG_IGN); 2147 signal(SIGHUP, SIG_IGN); 2148 sigprocmask(SIG_SETMASK, &omask, 0); 2149 signal(SIGPIPE, SIG_DFL); 2150 signal(SIGQUIT, SIG_DFL); 2151 signal(SIGALRM, SIG_DFL); 2152 signal(SIGHUP, SIG_DFL); 2153 2154 dup2(pfd[0], STDIN_FILENO); 2155 dup2(nulldesc, STDOUT_FILENO); 2156 dup2(nulldesc, STDERR_FILENO); 2157 for (i = getdtablesize(); i > 2; i--) 2158 (void) close(i); 2159 2160 (void) execvp(_PATH_BSHELL, argv); 2161 _exit(255); 2162 } 2163 2164 sigprocmask(SIG_SETMASK, &omask, 0); 2165 close(nulldesc); 2166 close(pfd[0]); 2167 /* 2168 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2169 * supposed to get an EWOULDBLOCK on writev(2), which is 2170 * caught by the logic above anyway, which will in turn close 2171 * the pipe, and fork a new logging subprocess if necessary. 2172 * The stale subprocess will be killed some time later unless 2173 * it terminated itself due to closing its input pipe (so we 2174 * get rid of really dead puppies). 2175 */ 2176 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2177 /* This is bad. */ 2178 (void)snprintf(errmsg, sizeof errmsg, 2179 "Warning: cannot change pipe to PID %d to " 2180 "non-blocking behaviour.", 2181 (int)*pid); 2182 logerror(errmsg); 2183 } 2184 return pfd[1]; 2185} 2186 2187void 2188deadq_enter(pid, name) 2189 pid_t pid; 2190 const char *name; 2191{ 2192 dq_t p; 2193 int status; 2194 2195 /* 2196 * Be paranoid, if we can't signal the process, don't enter it 2197 * into the dead queue (perhaps it's already dead). If possible, 2198 * we try to fetch and log the child's status. 2199 */ 2200 if (kill(pid, 0) != 0) { 2201 if (waitpid(pid, &status, WNOHANG) > 0) 2202 log_deadchild(pid, status, name); 2203 return; 2204 } 2205 2206 p = malloc(sizeof(struct deadq_entry)); 2207 if (p == 0) { 2208 errno = 0; 2209 logerror("panic: out of virtual memory!"); 2210 exit(1); 2211 } 2212 2213 p->dq_pid = pid; 2214 p->dq_timeout = DQ_TIMO_INIT; 2215 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2216} 2217 2218int 2219deadq_remove(pid) 2220 pid_t pid; 2221{ 2222 dq_t q; 2223 2224 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 2225 if (q->dq_pid == pid) { 2226 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2227 free(q); 2228 return 1; 2229 } 2230 2231 return 0; 2232} 2233 2234void 2235log_deadchild(pid, status, name) 2236 pid_t pid; 2237 int status; 2238 const char *name; 2239{ 2240 int code; 2241 char buf[256]; 2242 const char *reason; 2243 2244 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2245 if (WIFSIGNALED(status)) { 2246 reason = "due to signal"; 2247 code = WTERMSIG(status); 2248 } else { 2249 reason = "with status"; 2250 code = WEXITSTATUS(status); 2251 if (code == 0) 2252 return; 2253 } 2254 (void)snprintf(buf, sizeof buf, 2255 "Logging subprocess %d (%s) exited %s %d.", 2256 pid, name, reason, code); 2257 logerror(buf); 2258} 2259 2260int * 2261socksetup(af) 2262 int af; 2263{ 2264 struct addrinfo hints, *res, *r; 2265 int error, maxs, *s, *socks; 2266 2267 memset(&hints, 0, sizeof(hints)); 2268 hints.ai_flags = AI_PASSIVE; 2269 hints.ai_family = af; 2270 hints.ai_socktype = SOCK_DGRAM; 2271 error = getaddrinfo(NULL, "syslog", &hints, &res); 2272 if (error) { 2273 logerror(gai_strerror(error)); 2274 errno = 0; 2275 die(0); 2276 } 2277 2278 /* Count max number of sockets we may open */ 2279 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2280 socks = malloc((maxs+1) * sizeof(int)); 2281 if (!socks) { 2282 logerror("couldn't allocate memory for sockets"); 2283 die(0); 2284 } 2285 2286 *socks = 0; /* num of sockets counter at start of array */ 2287 s = socks + 1; 2288 for (r = res; r; r = r->ai_next) { 2289 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2290 if (*s < 0) { 2291 logerror("socket"); 2292 continue; 2293 } 2294#ifdef IPV6_BINDV6ONLY 2295 if (r->ai_family == AF_INET6) { 2296 int on = 1; 2297 if (setsockopt(*s, IPPROTO_IPV6, IPV6_BINDV6ONLY, 2298 (char *)&on, sizeof (on)) < 0) { 2299 logerror("setsockopt"); 2300 close(*s); 2301 continue; 2302 } 2303 } 2304#endif 2305 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2306 close(*s); 2307 logerror("bind"); 2308 continue; 2309 } 2310 2311 (*socks)++; 2312 s++; 2313 } 2314 2315 if (*socks == 0) { 2316 free(socks); 2317 if (Debug) 2318 return(NULL); 2319 else 2320 die(0); 2321 } 2322 if (res) 2323 freeaddrinfo(res); 2324 2325 return(socks); 2326} 2327