syslogd.c revision 35382
10Sstevel@tonic-gate/* 20Sstevel@tonic-gate * Copyright (c) 1983, 1988, 1993, 1994 30Sstevel@tonic-gate * The Regents of the University of California. All rights reserved. 40Sstevel@tonic-gate * 50Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 60Sstevel@tonic-gate * modification, are permitted provided that the following conditions 70Sstevel@tonic-gate * are met: 80Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright 90Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 100Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 110Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 120Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 130Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software 140Sstevel@tonic-gate * must display the following acknowledgement: 150Sstevel@tonic-gate * This product includes software developed by the University of 160Sstevel@tonic-gate * California, Berkeley and its contributors. 170Sstevel@tonic-gate * 4. Neither the name of the University nor the names of its contributors 180Sstevel@tonic-gate * may be used to endorse or promote products derived from this software 190Sstevel@tonic-gate * without specific prior written permission. 200Sstevel@tonic-gate * 210Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 220Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 230Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 240Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 250Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 260Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 270Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 280Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 290Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 300Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 310Sstevel@tonic-gate * SUCH DAMAGE. 320Sstevel@tonic-gate */ 330Sstevel@tonic-gate 340Sstevel@tonic-gate#ifndef lint 350Sstevel@tonic-gatestatic const char copyright[] = 360Sstevel@tonic-gate"@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 370Sstevel@tonic-gate The Regents of the University of California. All rights reserved.\n"; 380Sstevel@tonic-gate#endif /* not lint */ 390Sstevel@tonic-gate 400Sstevel@tonic-gate#ifndef lint 410Sstevel@tonic-gate#if 0 420Sstevel@tonic-gatestatic char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 430Sstevel@tonic-gate#endif 440Sstevel@tonic-gatestatic const char rcsid[] = 45 "$Id: syslogd.c,v 1.28 1998/02/28 15:14:00 jraynard Exp $"; 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 */ 71 72#define MAXLINE 1024 /* maximum line length */ 73#define MAXSVLINE 120 /* maximum saved line length */ 74#define DEFUPRI (LOG_USER|LOG_NOTICE) 75#define DEFSPRI (LOG_KERN|LOG_CRIT) 76#define TIMERINTVL 30 /* interval for checking flush, mark */ 77#define TTYMSGTIME 1 /* timed out passed to ttymsg */ 78 79#include <sys/param.h> 80#include <sys/ioctl.h> 81#include <sys/stat.h> 82#include <sys/wait.h> 83#include <sys/socket.h> 84#include <sys/msgbuf.h> 85#include <sys/queue.h> 86#include <sys/uio.h> 87#include <sys/un.h> 88#include <sys/time.h> 89#include <sys/resource.h> 90#include <sys/syslimits.h> 91#include <paths.h> 92 93#include <netinet/in.h> 94#include <netdb.h> 95#include <arpa/inet.h> 96 97#include <ctype.h> 98#include <err.h> 99#include <errno.h> 100#include <fcntl.h> 101#include <regex.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 115const char *LogName = _PATH_LOG; 116const char *ConfFile = _PATH_LOGCONF; 117const char *PidFile = _PATH_LOGPID; 118const char ctty[] = _PATH_CONSOLE; 119 120#define FDMASK(fd) (1 << (fd)) 121 122#define dprintf if (Debug) printf 123 124#define MAXUNAMES 20 /* maximum number of user names */ 125 126/* 127 * Flags to logmsg(). 128 */ 129 130#define IGN_CONS 0x001 /* don't print on console */ 131#define SYNC_FILE 0x002 /* do fsync on file after printing */ 132#define ADDDATE 0x004 /* add a date to the message */ 133#define MARK 0x008 /* this message is a mark */ 134 135/* 136 * This structure represents the files that will have log 137 * copies printed. 138 */ 139 140struct filed { 141 struct filed *f_next; /* next in linked list */ 142 short f_type; /* entry type, see below */ 143 short f_file; /* file descriptor */ 144 time_t f_time; /* time this was last written */ 145 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 146 char *f_program; /* program this applies to */ 147 union { 148 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 149 struct { 150 char f_hname[MAXHOSTNAMELEN+1]; 151 struct sockaddr_in f_addr; 152 } f_forw; /* forwarding address */ 153 char f_fname[MAXPATHLEN]; 154 struct { 155 char f_pname[MAXPATHLEN]; 156 pid_t f_pid; 157 } f_pipe; 158 } f_un; 159 char f_prevline[MAXSVLINE]; /* last message logged */ 160 char f_lasttime[16]; /* time of last occurrence */ 161 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 162 int f_prevpri; /* pri of f_prevline */ 163 int f_prevlen; /* length of f_prevline */ 164 int f_prevcount; /* repetition cnt of prevline */ 165 int f_repeatcount; /* number of "repeated" msgs */ 166}; 167 168/* 169 * Queue of about-to-be dead processes we should watch out for. 170 */ 171 172TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 173struct stailhead *deadq_headp; 174 175struct deadq_entry { 176 pid_t dq_pid; 177 int dq_timeout; 178 TAILQ_ENTRY(deadq_entry) dq_entries; 179}; 180 181/* 182 * The timeout to apply to processes waiting on the dead queue. Unit 183 * of measure is `mark intervals', i.e. 20 minutes by default. 184 * Processes on the dead queue will be terminated after that time. 185 */ 186 187#define DQ_TIMO_INIT 2 188 189typedef struct deadq_entry *dq_t; 190 191 192/* 193 * Struct to hold records of network addresses that are allowed to log 194 * to us. 195 */ 196struct allowedpeer { 197 int isnumeric; 198 u_short port; 199 union { 200 struct { 201 struct in_addr addr; 202 struct in_addr mask; 203 } numeric; 204 char *name; 205 } u; 206#define a_addr u.numeric.addr 207#define a_mask u.numeric.mask 208#define a_name u.name 209}; 210 211 212/* 213 * Intervals at which we flush out "message repeated" messages, 214 * in seconds after previous message is logged. After each flush, 215 * we move to the next interval until we reach the largest. 216 */ 217int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 218#define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 219#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 220#define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 221 (f)->f_repeatcount = MAXREPEAT; \ 222 } 223 224/* values for f_type */ 225#define F_UNUSED 0 /* unused entry */ 226#define F_FILE 1 /* regular file */ 227#define F_TTY 2 /* terminal */ 228#define F_CONSOLE 3 /* console terminal */ 229#define F_FORW 4 /* remote machine */ 230#define F_USERS 5 /* list of users */ 231#define F_WALL 6 /* everyone logged on */ 232#define F_PIPE 7 /* pipe to program */ 233 234char *TypeNames[8] = { 235 "UNUSED", "FILE", "TTY", "CONSOLE", 236 "FORW", "USERS", "WALL", "PIPE" 237}; 238 239struct filed *Files; 240struct filed consfile; 241 242int Debug; /* debug flag */ 243char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 244char *LocalDomain; /* our local domain name */ 245int finet; /* Internet datagram socket */ 246int LogPort; /* port number for INET connections */ 247int Initialized = 0; /* set when we have initialized ourselves */ 248int MarkInterval = 20 * 60; /* interval between marks in seconds */ 249int MarkSeq = 0; /* mark sequence number */ 250int SecureMode = 0; /* when true, speak only unix domain socks */ 251 252int created_lsock = 0; /* Flag if local socket created */ 253char bootfile[MAXLINE+1]; /* booted kernel file */ 254 255struct allowedpeer *AllowedPeers; 256int NumAllowed = 0; /* # of AllowedPeer entries */ 257 258int allowaddr __P((char *)); 259void cfline __P((char *, struct filed *, char *)); 260char *cvthname __P((struct sockaddr_in *)); 261void deadq_enter __P((pid_t)); 262int decode __P((const char *, CODE *)); 263void die __P((int)); 264void domark __P((int)); 265void fprintlog __P((struct filed *, int, char *)); 266void init __P((int)); 267void logerror __P((const char *)); 268void logmsg __P((int, char *, char *, int)); 269void printline __P((char *, char *)); 270void printsys __P((char *)); 271int p_open __P((char *, pid_t *)); 272void reapchild __P((int)); 273char *ttymsg __P((struct iovec *, int, char *, int)); 274static void usage __P((void)); 275int validate __P((struct sockaddr_in *, const char *)); 276void wallmsg __P((struct filed *, struct iovec *)); 277int waitdaemon __P((int, int, int)); 278void timedout __P((int)); 279 280int 281main(argc, argv) 282 int argc; 283 char *argv[]; 284{ 285 int ch, funix, i, inetm, fklog, klogm, len; 286 struct sockaddr_un sunx, fromunix; 287 struct sockaddr_in sin, frominet; 288 FILE *fp; 289 char *p, *hname, line[MSG_BSIZE + 1]; 290 struct timeval tv, *tvp; 291 pid_t ppid; 292 293 while ((ch = getopt(argc, argv, "a:dsf:m:p:")) != -1) 294 switch(ch) { 295 case 'd': /* debug */ 296 Debug++; 297 break; 298 case 'a': /* allow specific network addresses only */ 299 if (allowaddr(optarg) == -1) 300 usage(); 301 break; 302 case 'f': /* configuration file */ 303 ConfFile = optarg; 304 break; 305 case 'm': /* mark interval */ 306 MarkInterval = atoi(optarg) * 60; 307 break; 308 case 'p': /* path */ 309 LogName = optarg; 310 break; 311 case 's': /* no network mode */ 312 SecureMode++; 313 break; 314 case '?': 315 default: 316 usage(); 317 } 318 if ((argc -= optind) != 0) 319 usage(); 320 321 if (!Debug) { 322 ppid = waitdaemon(0, 0, 30); 323 if (ppid < 0) 324 err(1, "could not become daemon"); 325 } else 326 setlinebuf(stdout); 327 328 if (NumAllowed) 329 endservent(); 330 331 consfile.f_type = F_CONSOLE; 332 (void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1); 333 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 334 if ((p = strchr(LocalHostName, '.')) != NULL) { 335 *p++ = '\0'; 336 LocalDomain = p; 337 } else 338 LocalDomain = ""; 339 (void)strcpy(bootfile, getbootfile()); 340 (void)signal(SIGTERM, die); 341 (void)signal(SIGINT, Debug ? die : SIG_IGN); 342 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 343 (void)signal(SIGCHLD, reapchild); 344 (void)signal(SIGALRM, domark); 345 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 346 (void)alarm(TIMERINTVL); 347 348 TAILQ_INIT(&deadq_head); 349 350#ifndef SUN_LEN 351#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 352#endif 353 memset(&sunx, 0, sizeof(sunx)); 354 sunx.sun_family = AF_UNIX; 355 (void)strncpy(sunx.sun_path, LogName, sizeof(sunx.sun_path)); 356 (void)unlink(LogName); 357 funix = socket(AF_UNIX, SOCK_DGRAM, 0); 358 if (funix < 0 || 359 bind(funix, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 360 chmod(LogName, 0666) < 0) { 361 (void) snprintf(line, sizeof line, "cannot create %s", LogName); 362 logerror(line); 363 dprintf("cannot create %s (%d)\n", LogName, errno); 364 die(0); 365 } else 366 created_lsock = 1; 367 368 inetm = 0; 369 if (!SecureMode) { 370 finet = socket(AF_INET, SOCK_DGRAM, 0); 371 if (finet >= 0) { 372 struct servent *sp; 373 374 sp = getservbyname("syslog", "udp"); 375 if (sp == NULL) { 376 errno = 0; 377 logerror("syslog/udp: unknown service"); 378 die(0); 379 } 380 memset(&sin, 0, sizeof(sin)); 381 sin.sin_family = AF_INET; 382 sin.sin_port = LogPort = sp->s_port; 383 384 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 385 logerror("bind"); 386 if (!Debug) 387 die(0); 388 inetm = FDMASK(finet); 389 } 390 } 391 } 392 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 393 klogm = FDMASK(fklog); 394 else { 395 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 396 klogm = 0; 397 } 398 399 /* tuck my process id away */ 400 fp = fopen(PidFile, "w"); 401 if (fp != NULL) { 402 fprintf(fp, "%d\n", getpid()); 403 (void) fclose(fp); 404 } 405 406 dprintf("off & running....\n"); 407 408 init(0); 409 (void)signal(SIGHUP, init); 410 411 tvp = &tv; 412 tv.tv_sec = tv.tv_usec = 0; 413 414 for (;;) { 415 int nfds, readfds = FDMASK(funix) | inetm | klogm; 416 417 dprintf("readfds = %#x\n", readfds); 418 nfds = select(20, (fd_set *)&readfds, (fd_set *)NULL, 419 (fd_set *)NULL, tvp); 420 if (nfds == 0) { 421 if (tvp) { 422 tvp = NULL; 423 if (ppid != 1) 424 kill(ppid, SIGALRM); 425 } 426 continue; 427 } 428 if (nfds < 0) { 429 if (errno != EINTR) 430 logerror("select"); 431 continue; 432 } 433 dprintf("got a message (%d, %#x)\n", nfds, readfds); 434 if (readfds & klogm) { 435 i = read(fklog, line, sizeof(line) - 1); 436 if (i > 0) { 437 line[i] = '\0'; 438 printsys(line); 439 } else if (i < 0 && errno != EINTR) { 440 logerror("klog"); 441 fklog = -1; 442 klogm = 0; 443 } 444 } 445 if (readfds & FDMASK(funix)) { 446 len = sizeof(fromunix); 447 i = recvfrom(funix, line, MAXLINE, 0, 448 (struct sockaddr *)&fromunix, &len); 449 if (i > 0) { 450 line[i] = '\0'; 451 printline(LocalHostName, line); 452 } else if (i < 0 && errno != EINTR) 453 logerror("recvfrom unix"); 454 } 455 if (readfds & inetm) { 456 len = sizeof(frominet); 457 i = recvfrom(finet, line, MAXLINE, 0, 458 (struct sockaddr *)&frominet, &len); 459 if (i > 0) { 460 line[i] = '\0'; 461 hname = cvthname(&frominet); 462 if (validate(&frominet, hname)) 463 printline(hname, line); 464 } else if (i < 0 && errno != EINTR) 465 logerror("recvfrom inet"); 466 } 467 } 468} 469 470static void 471usage() 472{ 473 474 fprintf(stderr, "%s\n%s\n", 475 "usage: syslogd [-ds] [-a allowed_peer] [-f config_file]", 476 " [-m mark_interval] [-p log_socket]"); 477 exit(1); 478} 479 480/* 481 * Take a raw input line, decode the message, and print the message 482 * on the appropriate log files. 483 */ 484void 485printline(hname, msg) 486 char *hname; 487 char *msg; 488{ 489 int c, pri; 490 char *p, *q, line[MAXLINE + 1]; 491 492 /* test for special codes */ 493 pri = DEFUPRI; 494 p = msg; 495 if (*p == '<') { 496 pri = 0; 497 while (isdigit(*++p)) 498 pri = 10 * pri + (*p - '0'); 499 if (*p == '>') 500 ++p; 501 } 502 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 503 pri = DEFUPRI; 504 505 /* don't allow users to log kernel messages */ 506 if (LOG_FAC(pri) == LOG_KERN) 507 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 508 509 q = line; 510 511 while ((c = *p++ & 0177) != '\0' && 512 q < &line[sizeof(line) - 1]) 513 if (iscntrl(c)) 514 if (c == '\n') 515 *q++ = ' '; 516 else if (c == '\t') 517 *q++ = '\t'; 518 else { 519 *q++ = '^'; 520 *q++ = c ^ 0100; 521 } 522 else 523 *q++ = c; 524 *q = '\0'; 525 526 logmsg(pri, line, hname, 0); 527} 528 529/* 530 * Take a raw input line from /dev/klog, split and format similar to syslog(). 531 */ 532void 533printsys(msg) 534 char *msg; 535{ 536 int c, pri, flags; 537 char *lp, *p, *q, line[MAXLINE + 1]; 538 539 (void)strcpy(line, bootfile); 540 (void)strcat(line, ": "); 541 lp = line + strlen(line); 542 for (p = msg; *p != '\0'; ) { 543 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 544 pri = DEFSPRI; 545 if (*p == '<') { 546 pri = 0; 547 while (isdigit(*++p)) 548 pri = 10 * pri + (*p - '0'); 549 if (*p == '>') 550 ++p; 551 } else { 552 /* kernel printf's come out on console */ 553 flags |= IGN_CONS; 554 } 555 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 556 pri = DEFSPRI; 557 q = lp; 558 while (*p != '\0' && (c = *p++) != '\n' && 559 q < &line[MAXLINE]) 560 *q++ = c; 561 *q = '\0'; 562 logmsg(pri, line, LocalHostName, flags); 563 } 564} 565 566time_t now; 567 568/* 569 * Log a message to the appropriate log files, users, etc. based on 570 * the priority. 571 */ 572void 573logmsg(pri, msg, from, flags) 574 int pri; 575 char *msg, *from; 576 int flags; 577{ 578 struct filed *f; 579 int fac, msglen, omask, prilev; 580 char *timestamp; 581 char prog[NAME_MAX+1]; 582 int i; 583 584 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 585 pri, flags, from, msg); 586 587 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 588 589 /* 590 * Check to see if msg looks non-standard. 591 */ 592 msglen = strlen(msg); 593 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 594 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 595 flags |= ADDDATE; 596 597 (void)time(&now); 598 if (flags & ADDDATE) 599 timestamp = ctime(&now) + 4; 600 else { 601 timestamp = msg; 602 msg += 16; 603 msglen -= 16; 604 } 605 606 /* skip leading blanks */ 607 while(isspace(*msg)) { 608 msg++; 609 msglen--; 610 } 611 612 /* extract facility and priority level */ 613 if (flags & MARK) 614 fac = LOG_NFACILITIES; 615 else 616 fac = LOG_FAC(pri); 617 prilev = LOG_PRI(pri); 618 619 /* extract program name */ 620 for(i = 0; i < NAME_MAX; i++) { 621 if(!isalnum(msg[i])) 622 break; 623 prog[i] = msg[i]; 624 } 625 prog[i] = 0; 626 627 /* log the message to the particular outputs */ 628 if (!Initialized) { 629 f = &consfile; 630 f->f_file = open(ctty, O_WRONLY, 0); 631 632 if (f->f_file >= 0) { 633 fprintlog(f, flags, msg); 634 (void)close(f->f_file); 635 } 636 (void)sigsetmask(omask); 637 return; 638 } 639 for (f = Files; f; f = f->f_next) { 640 /* skip messages that are incorrect priority */ 641 if (f->f_pmask[fac] < prilev || 642 f->f_pmask[fac] == INTERNAL_NOPRI) 643 continue; 644 /* skip messages with the incorrect program name */ 645 if(f->f_program) 646 if(strcmp(prog, f->f_program) != 0) 647 continue; 648 649 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 650 continue; 651 652 /* don't output marks to recently written files */ 653 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 654 continue; 655 656 /* 657 * suppress duplicate lines to this file 658 */ 659 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 660 !strcmp(msg, f->f_prevline) && 661 !strcmp(from, f->f_prevhost)) { 662 (void)strncpy(f->f_lasttime, timestamp, 15); 663 f->f_prevcount++; 664 dprintf("msg repeated %d times, %ld sec of %d\n", 665 f->f_prevcount, now - f->f_time, 666 repeatinterval[f->f_repeatcount]); 667 /* 668 * If domark would have logged this by now, 669 * flush it now (so we don't hold isolated messages), 670 * but back off so we'll flush less often 671 * in the future. 672 */ 673 if (now > REPEATTIME(f)) { 674 fprintlog(f, flags, (char *)NULL); 675 BACKOFF(f); 676 } 677 } else { 678 /* new line, save it */ 679 if (f->f_prevcount) 680 fprintlog(f, 0, (char *)NULL); 681 f->f_repeatcount = 0; 682 f->f_prevpri = pri; 683 (void)strncpy(f->f_lasttime, timestamp, 15); 684 (void)strncpy(f->f_prevhost, from, 685 sizeof(f->f_prevhost)); 686 if (msglen < MAXSVLINE) { 687 f->f_prevlen = msglen; 688 (void)strcpy(f->f_prevline, msg); 689 fprintlog(f, flags, (char *)NULL); 690 } else { 691 f->f_prevline[0] = 0; 692 f->f_prevlen = 0; 693 fprintlog(f, flags, msg); 694 } 695 } 696 } 697 (void)sigsetmask(omask); 698} 699 700void 701fprintlog(f, flags, msg) 702 struct filed *f; 703 int flags; 704 char *msg; 705{ 706 struct iovec iov[6]; 707 struct iovec *v; 708 int l; 709 char line[MAXLINE + 1], repbuf[80], greetings[200]; 710 char *msgret; 711 712 v = iov; 713 if (f->f_type == F_WALL) { 714 v->iov_base = greetings; 715 v->iov_len = snprintf(greetings, sizeof greetings, 716 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 717 f->f_prevhost, ctime(&now)); 718 v++; 719 v->iov_base = ""; 720 v->iov_len = 0; 721 v++; 722 } else { 723 v->iov_base = f->f_lasttime; 724 v->iov_len = 15; 725 v++; 726 v->iov_base = " "; 727 v->iov_len = 1; 728 v++; 729 } 730 v->iov_base = f->f_prevhost; 731 v->iov_len = strlen(v->iov_base); 732 v++; 733 v->iov_base = " "; 734 v->iov_len = 1; 735 v++; 736 737 if (msg) { 738 v->iov_base = msg; 739 v->iov_len = strlen(msg); 740 } else if (f->f_prevcount > 1) { 741 v->iov_base = repbuf; 742 v->iov_len = sprintf(repbuf, "last message repeated %d times", 743 f->f_prevcount); 744 } else { 745 v->iov_base = f->f_prevline; 746 v->iov_len = f->f_prevlen; 747 } 748 v++; 749 750 dprintf("Logging to %s", TypeNames[f->f_type]); 751 f->f_time = now; 752 753 switch (f->f_type) { 754 case F_UNUSED: 755 dprintf("\n"); 756 break; 757 758 case F_FORW: 759 dprintf(" %s\n", f->f_un.f_forw.f_hname); 760 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 761 f->f_prevpri, iov[0].iov_base, iov[4].iov_base); 762 if (l > MAXLINE) 763 l = MAXLINE; 764 if ((finet >= 0) && 765 (sendto(finet, line, l, 0, 766 (struct sockaddr *)&f->f_un.f_forw.f_addr, 767 sizeof(f->f_un.f_forw.f_addr)) != l)) { 768 int e = errno; 769 (void)close(f->f_file); 770 f->f_type = F_UNUSED; 771 errno = e; 772 logerror("sendto"); 773 } 774 break; 775 776 case F_FILE: 777 dprintf(" %s\n", f->f_un.f_fname); 778 v->iov_base = "\n"; 779 v->iov_len = 1; 780 if (writev(f->f_file, iov, 6) < 0) { 781 int e = errno; 782 (void)close(f->f_file); 783 f->f_type = F_UNUSED; 784 errno = e; 785 logerror(f->f_un.f_fname); 786 } else if (flags & SYNC_FILE) 787 (void)fsync(f->f_file); 788 break; 789 790 case F_PIPE: 791 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 792 v->iov_base = "\n"; 793 v->iov_len = 1; 794 if (f->f_un.f_pipe.f_pid == 0) { 795 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 796 &f->f_un.f_pipe.f_pid)) < 0) { 797 f->f_type = F_UNUSED; 798 logerror(f->f_un.f_pipe.f_pname); 799 break; 800 } 801 } 802 if (writev(f->f_file, iov, 6) < 0) { 803 int e = errno; 804 (void)close(f->f_file); 805 if (f->f_un.f_pipe.f_pid > 0) 806 deadq_enter(f->f_un.f_pipe.f_pid); 807 f->f_un.f_pipe.f_pid = 0; 808 errno = e; 809 logerror(f->f_un.f_pipe.f_pname); 810 } 811 break; 812 813 case F_CONSOLE: 814 if (flags & IGN_CONS) { 815 dprintf(" (ignored)\n"); 816 break; 817 } 818 /* FALLTHROUGH */ 819 820 case F_TTY: 821 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 822 v->iov_base = "\r\n"; 823 v->iov_len = 2; 824 825 errno = 0; /* ttymsg() only sometimes returns an errno */ 826 if ((msgret = ttymsg(iov, 6, f->f_un.f_fname, 10))) { 827 f->f_type = F_UNUSED; 828 logerror(msgret); 829 } 830 break; 831 832 case F_USERS: 833 case F_WALL: 834 dprintf("\n"); 835 v->iov_base = "\r\n"; 836 v->iov_len = 2; 837 wallmsg(f, iov); 838 break; 839 } 840 f->f_prevcount = 0; 841} 842 843/* 844 * WALLMSG -- Write a message to the world at large 845 * 846 * Write the specified message to either the entire 847 * world, or a list of approved users. 848 */ 849void 850wallmsg(f, iov) 851 struct filed *f; 852 struct iovec *iov; 853{ 854 static int reenter; /* avoid calling ourselves */ 855 FILE *uf; 856 struct utmp ut; 857 int i; 858 char *p; 859 char line[sizeof(ut.ut_line) + 1]; 860 861 if (reenter++) 862 return; 863 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 864 logerror(_PATH_UTMP); 865 reenter = 0; 866 return; 867 } 868 /* NOSTRICT */ 869 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 870 if (ut.ut_name[0] == '\0') 871 continue; 872 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 873 line[sizeof(ut.ut_line)] = '\0'; 874 if (f->f_type == F_WALL) { 875 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) != NULL) { 876 errno = 0; /* already in msg */ 877 logerror(p); 878 } 879 continue; 880 } 881 /* should we send the message to this user? */ 882 for (i = 0; i < MAXUNAMES; i++) { 883 if (!f->f_un.f_uname[i][0]) 884 break; 885 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 886 UT_NAMESIZE)) { 887 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) 888 != NULL) { 889 errno = 0; /* already in msg */ 890 logerror(p); 891 } 892 break; 893 } 894 } 895 } 896 (void)fclose(uf); 897 reenter = 0; 898} 899 900void 901reapchild(signo) 902 int signo; 903{ 904 int status, code; 905 pid_t pid; 906 struct filed *f; 907 char buf[256]; 908 const char *reason; 909 dq_t q; 910 911 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 912 if (!Initialized) 913 /* Don't tell while we are initting. */ 914 continue; 915 916 /* First, look if it's a process from the dead queue. */ 917 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 918 if (q->dq_pid == pid) { 919 TAILQ_REMOVE(&deadq_head, q, dq_entries); 920 free(q); 921 goto oncemore; 922 } 923 924 /* Now, look in list of active processes. */ 925 for (f = Files; f; f = f->f_next) 926 if (f->f_type == F_PIPE && 927 f->f_un.f_pipe.f_pid == pid) { 928 (void)close(f->f_file); 929 930 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 931 f->f_un.f_pipe.f_pid = 0; 932 if (WIFSIGNALED(status)) { 933 reason = "due to signal"; 934 code = WTERMSIG(status); 935 } else { 936 reason = "with status"; 937 code = WEXITSTATUS(status); 938 if (code == 0) 939 goto oncemore; /* Exited OK. */ 940 } 941 (void)snprintf(buf, sizeof buf, 942 "Logging subprocess %d (%s) exited %s %d.", 943 pid, f->f_un.f_pipe.f_pname, 944 reason, code); 945 logerror(buf); 946 break; 947 } 948 oncemore: 949 } 950} 951 952/* 953 * Return a printable representation of a host address. 954 */ 955char * 956cvthname(f) 957 struct sockaddr_in *f; 958{ 959 struct hostent *hp; 960 char *p; 961 962 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 963 964 if (f->sin_family != AF_INET) { 965 dprintf("Malformed from address\n"); 966 return ("???"); 967 } 968 hp = gethostbyaddr((char *)&f->sin_addr, 969 sizeof(struct in_addr), f->sin_family); 970 if (hp == 0) { 971 dprintf("Host name for your address (%s) unknown\n", 972 inet_ntoa(f->sin_addr)); 973 return (inet_ntoa(f->sin_addr)); 974 } 975 if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 976 *p = '\0'; 977 return (hp->h_name); 978} 979 980void 981domark(signo) 982 int signo; 983{ 984 struct filed *f; 985 dq_t q; 986 987 now = time((time_t *)NULL); 988 MarkSeq += TIMERINTVL; 989 if (MarkSeq >= MarkInterval) { 990 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 991 MarkSeq = 0; 992 } 993 994 for (f = Files; f; f = f->f_next) { 995 if (f->f_prevcount && now >= REPEATTIME(f)) { 996 dprintf("flush %s: repeated %d times, %d sec.\n", 997 TypeNames[f->f_type], f->f_prevcount, 998 repeatinterval[f->f_repeatcount]); 999 fprintlog(f, 0, (char *)NULL); 1000 BACKOFF(f); 1001 } 1002 } 1003 1004 /* Walk the dead queue, and see if we should signal somebody. */ 1005 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1006 switch (q->dq_timeout) { 1007 case 0: 1008 /* Already signalled once, try harder now. */ 1009 kill(q->dq_pid, SIGKILL); 1010 break; 1011 1012 case 1: 1013 /* 1014 * Timed out on dead queue, send terminate 1015 * signal. Note that we leave the removal 1016 * from the dead queue to reapchild(), which 1017 * will also log the event. 1018 */ 1019 kill(q->dq_pid, SIGTERM); 1020 /* FALLTROUGH */ 1021 1022 default: 1023 q->dq_timeout--; 1024 } 1025 1026 (void)alarm(TIMERINTVL); 1027} 1028 1029/* 1030 * Print syslogd errors some place. 1031 */ 1032void 1033logerror(type) 1034 const char *type; 1035{ 1036 char buf[512]; 1037 1038 if (errno) 1039 (void)snprintf(buf, 1040 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1041 else 1042 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1043 errno = 0; 1044 dprintf("%s\n", buf); 1045 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1046} 1047 1048void 1049die(signo) 1050 int signo; 1051{ 1052 struct filed *f; 1053 int was_initialized; 1054 char buf[100]; 1055 1056 was_initialized = Initialized; 1057 Initialized = 0; /* Don't log SIGCHLDs. */ 1058 for (f = Files; f != NULL; f = f->f_next) { 1059 /* flush any pending output */ 1060 if (f->f_prevcount) 1061 fprintlog(f, 0, (char *)NULL); 1062 if (f->f_type == F_PIPE) 1063 (void)close(f->f_file); 1064 } 1065 Initialized = was_initialized; 1066 if (signo) { 1067 dprintf("syslogd: exiting on signal %d\n", signo); 1068 (void)sprintf(buf, "exiting on signal %d", signo); 1069 errno = 0; 1070 logerror(buf); 1071 } 1072 if (created_lsock) 1073 (void)unlink(LogName); 1074 exit(1); 1075} 1076 1077/* 1078 * INIT -- Initialize syslogd from configuration table 1079 */ 1080void 1081init(signo) 1082 int signo; 1083{ 1084 int i; 1085 FILE *cf; 1086 struct filed *f, *next, **nextp; 1087 char *p; 1088 char cline[LINE_MAX]; 1089 char prog[NAME_MAX+1]; 1090 1091 dprintf("init\n"); 1092 1093 /* 1094 * Close all open log files. 1095 */ 1096 Initialized = 0; 1097 for (f = Files; f != NULL; f = next) { 1098 /* flush any pending output */ 1099 if (f->f_prevcount) 1100 fprintlog(f, 0, (char *)NULL); 1101 1102 switch (f->f_type) { 1103 case F_FILE: 1104 case F_FORW: 1105 case F_CONSOLE: 1106 case F_TTY: 1107 (void)close(f->f_file); 1108 break; 1109 case F_PIPE: 1110 (void)close(f->f_file); 1111 if (f->f_un.f_pipe.f_pid > 0) 1112 deadq_enter(f->f_un.f_pipe.f_pid); 1113 f->f_un.f_pipe.f_pid = 0; 1114 break; 1115 } 1116 next = f->f_next; 1117 if(f->f_program) free(f->f_program); 1118 free((char *)f); 1119 } 1120 Files = NULL; 1121 nextp = &Files; 1122 1123 /* open the configuration file */ 1124 if ((cf = fopen(ConfFile, "r")) == NULL) { 1125 dprintf("cannot open %s\n", ConfFile); 1126 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1127 cfline("*.ERR\t/dev/console", *nextp, "*"); 1128 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1129 cfline("*.PANIC\t*", (*nextp)->f_next, "*"); 1130 Initialized = 1; 1131 return; 1132 } 1133 1134 /* 1135 * Foreach line in the conf table, open that file. 1136 */ 1137 f = NULL; 1138 strcpy(prog, "*"); 1139 while (fgets(cline, sizeof(cline), cf) != NULL) { 1140 /* 1141 * check for end-of-section, comments, strip off trailing 1142 * spaces and newline character. #!prog is treated specially: 1143 * following lines apply only to that program. 1144 */ 1145 for (p = cline; isspace(*p); ++p) 1146 continue; 1147 if (*p == 0) 1148 continue; 1149 if(*p == '#') { 1150 p++; 1151 if(*p!='!') 1152 continue; 1153 } 1154 if(*p=='!') { 1155 p++; 1156 while(isspace(*p)) p++; 1157 if(!*p) { 1158 strcpy(prog, "*"); 1159 continue; 1160 } 1161 for(i = 0; i < NAME_MAX; i++) { 1162 if(!isalnum(p[i])) 1163 break; 1164 prog[i] = p[i]; 1165 } 1166 prog[i] = 0; 1167 continue; 1168 } 1169 for (p = strchr(cline, '\0'); isspace(*--p);) 1170 continue; 1171 *++p = '\0'; 1172 f = (struct filed *)calloc(1, sizeof(*f)); 1173 *nextp = f; 1174 nextp = &f->f_next; 1175 cfline(cline, f, prog); 1176 } 1177 1178 /* close the configuration file */ 1179 (void)fclose(cf); 1180 1181 Initialized = 1; 1182 1183 if (Debug) { 1184 for (f = Files; f; f = f->f_next) { 1185 for (i = 0; i <= LOG_NFACILITIES; i++) 1186 if (f->f_pmask[i] == INTERNAL_NOPRI) 1187 printf("X "); 1188 else 1189 printf("%d ", f->f_pmask[i]); 1190 printf("%s: ", TypeNames[f->f_type]); 1191 switch (f->f_type) { 1192 case F_FILE: 1193 printf("%s", f->f_un.f_fname); 1194 break; 1195 1196 case F_CONSOLE: 1197 case F_TTY: 1198 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1199 break; 1200 1201 case F_FORW: 1202 printf("%s", f->f_un.f_forw.f_hname); 1203 break; 1204 1205 case F_PIPE: 1206 printf("%s", f->f_un.f_pipe.f_pname); 1207 break; 1208 1209 case F_USERS: 1210 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1211 printf("%s, ", f->f_un.f_uname[i]); 1212 break; 1213 } 1214 if(f->f_program) { 1215 printf(" (%s)", f->f_program); 1216 } 1217 printf("\n"); 1218 } 1219 } 1220 1221 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1222 dprintf("syslogd: restarted\n"); 1223} 1224 1225/* 1226 * Crack a configuration file line 1227 */ 1228void 1229cfline(line, f, prog) 1230 char *line; 1231 struct filed *f; 1232 char *prog; 1233{ 1234 struct hostent *hp; 1235 int i, pri; 1236 char *bp, *p, *q; 1237 char buf[MAXLINE], ebuf[100]; 1238 1239 dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog); 1240 1241 errno = 0; /* keep strerror() stuff out of logerror messages */ 1242 1243 /* clear out file entry */ 1244 memset(f, 0, sizeof(*f)); 1245 for (i = 0; i <= LOG_NFACILITIES; i++) 1246 f->f_pmask[i] = INTERNAL_NOPRI; 1247 1248 /* save program name if any */ 1249 if(prog && *prog=='*') prog = NULL; 1250 if(prog) { 1251 f->f_program = calloc(1, strlen(prog)+1); 1252 if(f->f_program) { 1253 strcpy(f->f_program, prog); 1254 } 1255 } 1256 1257 /* scan through the list of selectors */ 1258 for (p = line; *p && *p != '\t';) { 1259 1260 /* find the end of this facility name list */ 1261 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1262 continue; 1263 1264 /* collect priority name */ 1265 for (bp = buf; *q && !strchr("\t,;", *q); ) 1266 *bp++ = *q++; 1267 *bp = '\0'; 1268 1269 /* skip cruft */ 1270 while (strchr(", ;", *q)) 1271 q++; 1272 1273 /* decode priority name */ 1274 if (*buf == '*') 1275 pri = LOG_PRIMASK + 1; 1276 else { 1277 pri = decode(buf, prioritynames); 1278 if (pri < 0) { 1279 (void)snprintf(ebuf, sizeof ebuf, 1280 "unknown priority name \"%s\"", buf); 1281 logerror(ebuf); 1282 return; 1283 } 1284 } 1285 1286 /* scan facilities */ 1287 while (*p && !strchr("\t.;", *p)) { 1288 for (bp = buf; *p && !strchr("\t,;.", *p); ) 1289 *bp++ = *p++; 1290 *bp = '\0'; 1291 if (*buf == '*') 1292 for (i = 0; i < LOG_NFACILITIES; i++) 1293 f->f_pmask[i] = pri; 1294 else { 1295 i = decode(buf, facilitynames); 1296 if (i < 0) { 1297 (void)snprintf(ebuf, sizeof ebuf, 1298 "unknown facility name \"%s\"", 1299 buf); 1300 logerror(ebuf); 1301 return; 1302 } 1303 f->f_pmask[i >> 3] = pri; 1304 } 1305 while (*p == ',' || *p == ' ') 1306 p++; 1307 } 1308 1309 p = q; 1310 } 1311 1312 /* skip to action part */ 1313 while (*p == '\t') 1314 p++; 1315 1316 switch (*p) 1317 { 1318 case '@': 1319 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1320 hp = gethostbyname(p); 1321 if (hp == NULL) { 1322 extern int h_errno; 1323 1324 logerror(hstrerror(h_errno)); 1325 break; 1326 } 1327 memset(&f->f_un.f_forw.f_addr, 0, 1328 sizeof(f->f_un.f_forw.f_addr)); 1329 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1330 f->f_un.f_forw.f_addr.sin_port = LogPort; 1331 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1332 f->f_type = F_FORW; 1333 break; 1334 1335 case '/': 1336 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1337 f->f_type = F_UNUSED; 1338 logerror(p); 1339 break; 1340 } 1341 if (isatty(f->f_file)) { 1342 if (strcmp(p, ctty) == 0) 1343 f->f_type = F_CONSOLE; 1344 else 1345 f->f_type = F_TTY; 1346 (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); 1347 } else { 1348 (void)strcpy(f->f_un.f_fname, p); 1349 f->f_type = F_FILE; 1350 } 1351 break; 1352 1353 case '|': 1354 f->f_un.f_pipe.f_pid = 0; 1355 (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); 1356 f->f_type = F_PIPE; 1357 break; 1358 1359 case '*': 1360 f->f_type = F_WALL; 1361 break; 1362 1363 default: 1364 for (i = 0; i < MAXUNAMES && *p; i++) { 1365 for (q = p; *q && *q != ','; ) 1366 q++; 1367 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1368 if ((q - p) > UT_NAMESIZE) 1369 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1370 else 1371 f->f_un.f_uname[i][q - p] = '\0'; 1372 while (*q == ',' || *q == ' ') 1373 q++; 1374 p = q; 1375 } 1376 f->f_type = F_USERS; 1377 break; 1378 } 1379} 1380 1381 1382/* 1383 * Decode a symbolic name to a numeric value 1384 */ 1385int 1386decode(name, codetab) 1387 const char *name; 1388 CODE *codetab; 1389{ 1390 CODE *c; 1391 char *p, buf[40]; 1392 1393 if (isdigit(*name)) 1394 return (atoi(name)); 1395 1396 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1397 if (isupper(*name)) 1398 *p = tolower(*name); 1399 else 1400 *p = *name; 1401 } 1402 *p = '\0'; 1403 for (c = codetab; c->c_name; c++) 1404 if (!strcmp(buf, c->c_name)) 1405 return (c->c_val); 1406 1407 return (-1); 1408} 1409 1410/* 1411 * fork off and become a daemon, but wait for the child to come online 1412 * before returing to the parent, or we get disk thrashing at boot etc. 1413 * Set a timer so we don't hang forever if it wedges. 1414 */ 1415int 1416waitdaemon(nochdir, noclose, maxwait) 1417 int nochdir, noclose, maxwait; 1418{ 1419 int fd; 1420 int status; 1421 pid_t pid, childpid; 1422 1423 switch (childpid = fork()) { 1424 case -1: 1425 return (-1); 1426 case 0: 1427 break; 1428 default: 1429 signal(SIGALRM, timedout); 1430 alarm(maxwait); 1431 while ((pid = wait3(&status, 0, NULL)) != -1) { 1432 if (WIFEXITED(status)) 1433 errx(1, "child pid %d exited with return code %d", 1434 pid, WEXITSTATUS(status)); 1435 if (WIFSIGNALED(status)) 1436 errx(1, "child pid %d exited on signal %d%s", 1437 pid, WTERMSIG(status), 1438 WCOREDUMP(status) ? " (core dumped)" : 1439 ""); 1440 if (pid == childpid) /* it's gone... */ 1441 break; 1442 } 1443 exit(0); 1444 } 1445 1446 if (setsid() == -1) 1447 return (-1); 1448 1449 if (!nochdir) 1450 (void)chdir("/"); 1451 1452 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1453 (void)dup2(fd, STDIN_FILENO); 1454 (void)dup2(fd, STDOUT_FILENO); 1455 (void)dup2(fd, STDERR_FILENO); 1456 if (fd > 2) 1457 (void)close (fd); 1458 } 1459 return (getppid()); 1460} 1461 1462/* 1463 * We get a SIGALRM from the child when it's running and finished doing it's 1464 * fsync()'s or O_SYNC writes for all the boot messages. 1465 * 1466 * We also get a signal from the kernel if the timer expires, so check to 1467 * see what happened. 1468 */ 1469void 1470timedout(sig) 1471 int sig __unused; 1472{ 1473 int left; 1474 left = alarm(0); 1475 signal(SIGALRM, SIG_DFL); 1476 if (left == 0) 1477 errx(1, "timed out waiting for child"); 1478 else 1479 exit(0); 1480} 1481 1482/* 1483 * Add `s' to the list of allowable peer addresses to accept messages 1484 * from. 1485 * 1486 * `s' is a string in the form: 1487 * 1488 * [*]domainname[:{servicename|portnumber|*}] 1489 * 1490 * or 1491 * 1492 * netaddr/maskbits[:{servicename|portnumber|*}] 1493 * 1494 * Returns -1 on error, 0 if the argument was valid. 1495 */ 1496int 1497allowaddr(s) 1498 char *s; 1499{ 1500 char *cp1, *cp2; 1501 struct allowedpeer ap; 1502 struct servent *se; 1503 regex_t re; 1504 int i; 1505 1506 if ((cp1 = strrchr(s, ':'))) { 1507 /* service/port provided */ 1508 *cp1++ = '\0'; 1509 if (strlen(cp1) == 1 && *cp1 == '*') 1510 /* any port allowed */ 1511 ap.port = htons(0); 1512 else if ((se = getservbyname(cp1, "udp"))) 1513 ap.port = se->s_port; 1514 else { 1515 ap.port = htons((int)strtol(cp1, &cp2, 0)); 1516 if (*cp2 != '\0') 1517 return -1; /* port not numeric */ 1518 } 1519 } else { 1520 if ((se = getservbyname("syslog", "udp"))) 1521 ap.port = se->s_port; 1522 else 1523 /* sanity, should not happen */ 1524 ap.port = htons(514); 1525 } 1526 1527 /* the regexp's are ugly, but the cleanest way */ 1528 1529 if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$", 1530 REG_EXTENDED)) 1531 /* if RE compilation fails, that's an internal error */ 1532 abort(); 1533 if (regexec(&re, s, 0, 0, 0) == 0) { 1534 /* arg `s' is numeric */ 1535 ap.isnumeric = 1; 1536 if ((cp1 = strchr(s, '/')) != NULL) { 1537 *cp1++ = '\0'; 1538 i = atoi(cp1); 1539 if (i < 0 || i > 32) 1540 return -1; 1541 /* convert masklen to netmask */ 1542 ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1)); 1543 } 1544 if (ascii2addr(AF_INET, s, &ap.a_addr) == -1) 1545 return -1; 1546 if (cp1 == NULL) { 1547 /* use default netmask */ 1548 if (IN_CLASSA(ntohl(ap.a_addr.s_addr))) 1549 ap.a_mask.s_addr = htonl(IN_CLASSA_NET); 1550 else if (IN_CLASSB(ntohl(ap.a_addr.s_addr))) 1551 ap.a_mask.s_addr = htonl(IN_CLASSB_NET); 1552 else 1553 ap.a_mask.s_addr = htonl(IN_CLASSC_NET); 1554 } 1555 } else { 1556 /* arg `s' is domain name */ 1557 ap.isnumeric = 0; 1558 ap.a_name = s; 1559 } 1560 regfree(&re); 1561 1562 if (Debug) { 1563 printf("allowaddr: rule %d: ", NumAllowed); 1564 if (ap.isnumeric) { 1565 printf("numeric, "); 1566 printf("addr = %s, ", 1567 addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0)); 1568 printf("mask = %s; ", 1569 addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0)); 1570 } else 1571 printf("domainname = %s; ", ap.a_name); 1572 printf("port = %d\n", ntohs(ap.port)); 1573 } 1574 1575 if ((AllowedPeers = realloc(AllowedPeers, 1576 ++NumAllowed * sizeof(struct allowedpeer))) 1577 == NULL) { 1578 fprintf(stderr, "Out of memory!\n"); 1579 exit(EX_OSERR); 1580 } 1581 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 1582 return 0; 1583} 1584 1585/* 1586 * Validate that the remote peer has permission to log to us. 1587 */ 1588int 1589validate(sin, hname) 1590 struct sockaddr_in *sin; 1591 const char *hname; 1592{ 1593 int i; 1594 size_t l1, l2; 1595 char *cp, name[MAXHOSTNAMELEN]; 1596 struct allowedpeer *ap; 1597 1598 if (NumAllowed == 0) 1599 /* traditional behaviour, allow everything */ 1600 return 1; 1601 1602 strncpy(name, hname, sizeof name); 1603 if (strchr(name, '.') == NULL) { 1604 strncat(name, ".", sizeof name - strlen(name) - 1); 1605 strncat(name, LocalDomain, sizeof name - strlen(name) - 1); 1606 } 1607 dprintf("validate: dgram from IP %s, port %d, name %s;\n", 1608 addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0), 1609 ntohs(sin->sin_port), name); 1610 1611 /* now, walk down the list */ 1612 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 1613 if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) { 1614 dprintf("rejected in rule %d due to port mismatch.\n", i); 1615 continue; 1616 } 1617 1618 if (ap->isnumeric) { 1619 if ((sin->sin_addr.s_addr & ap->a_mask.s_addr) 1620 != ap->a_addr.s_addr) { 1621 dprintf("rejected in rule %d due to IP mismatch.\n", i); 1622 continue; 1623 } 1624 } else { 1625 cp = ap->a_name; 1626 l1 = strlen(name); 1627 if (*cp == '*') { 1628 /* allow wildmatch */ 1629 cp++; 1630 l2 = strlen(cp); 1631 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 1632 dprintf("rejected in rule %d due to name mismatch.\n", i); 1633 continue; 1634 } 1635 } else { 1636 /* exact match */ 1637 l2 = strlen(cp); 1638 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 1639 dprintf("rejected in rule %d due to name mismatch.\n", i); 1640 continue; 1641 } 1642 } 1643 } 1644 dprintf("accepted in rule %d.\n", i); 1645 return 1; /* hooray! */ 1646 } 1647 return 0; 1648} 1649 1650/* 1651 * Fairly similar to popen(3), but returns an open descriptor, as 1652 * opposed to a FILE *. 1653 */ 1654int 1655p_open(prog, pid) 1656 char *prog; 1657 pid_t *pid; 1658{ 1659 int pfd[2], nulldesc, i; 1660 sigset_t omask, mask; 1661 char *argv[4]; /* sh -c cmd NULL */ 1662 char errmsg[200]; 1663 1664 if (pipe(pfd) == -1) 1665 return -1; 1666 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 1667 /* we are royally screwed anyway */ 1668 return -1; 1669 1670 sigemptyset(&mask); 1671 sigaddset(&mask, SIGALRM); 1672 sigaddset(&mask, SIGHUP); 1673 sigprocmask(SIG_BLOCK, &mask, &omask); 1674 switch ((*pid = fork())) { 1675 case -1: 1676 sigprocmask(SIG_SETMASK, &omask, 0); 1677 close(nulldesc); 1678 return -1; 1679 1680 case 0: 1681 argv[0] = "sh"; 1682 argv[1] = "-c"; 1683 argv[2] = prog; 1684 argv[3] = NULL; 1685 1686 alarm(0); 1687 (void)setsid(); /* Avoid catching SIGHUPs. */ 1688 1689 /* 1690 * Throw away pending signals, and reset signal 1691 * behaviour to standard values. 1692 */ 1693 signal(SIGALRM, SIG_IGN); 1694 signal(SIGHUP, SIG_IGN); 1695 sigprocmask(SIG_SETMASK, &omask, 0); 1696 signal(SIGPIPE, SIG_DFL); 1697 signal(SIGQUIT, SIG_DFL); 1698 signal(SIGALRM, SIG_DFL); 1699 signal(SIGHUP, SIG_DFL); 1700 1701 dup2(pfd[0], STDIN_FILENO); 1702 dup2(nulldesc, STDOUT_FILENO); 1703 dup2(nulldesc, STDERR_FILENO); 1704 for (i = getdtablesize(); i > 2; i--) 1705 (void) close(i); 1706 1707 (void) execvp(_PATH_BSHELL, argv); 1708 _exit(255); 1709 } 1710 1711 sigprocmask(SIG_SETMASK, &omask, 0); 1712 close(nulldesc); 1713 close(pfd[0]); 1714 /* 1715 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 1716 * supposed to get an EWOULDBLOCK on writev(2), which is 1717 * caught by the logic above anyway, which will in turn close 1718 * the pipe, and fork a new logging subprocess if necessary. 1719 * The stale subprocess will be killed some time later unless 1720 * it terminated itself due to closing its input pipe (so we 1721 * get rid of really dead puppies). 1722 */ 1723 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 1724 /* This is bad. */ 1725 (void)snprintf(errmsg, sizeof errmsg, 1726 "Warning: cannot change pipe to PID %d to " 1727 "non-blocking behaviour.", 1728 (int)*pid); 1729 logerror(errmsg); 1730 } 1731 return pfd[1]; 1732} 1733 1734void 1735deadq_enter(pid) 1736 pid_t pid; 1737{ 1738 dq_t p; 1739 1740 p = malloc(sizeof(struct deadq_entry)); 1741 if (p == 0) { 1742 errno = 0; 1743 logerror("panic: out of virtual memory!"); 1744 exit(1); 1745 } 1746 1747 p->dq_pid = pid; 1748 p->dq_timeout = DQ_TIMO_INIT; 1749 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 1750} 1751