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 35 static const char copyright[] = 36 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 /* 39 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 40 */ 41 static const char rcsid[] = 42 "$Id: syslogd.c,v 1.24 1997/04/26 00:03:21 pst Exp $"; 43 #endif /* not lint */ 44 45 /* 46 * syslogd -- log system messages 47 * 48 * This program implements a system log. It takes a series of lines. 49 * Each line may have a priority, signified as "<n>" as 50 * the first characters of the line. If this is 51 * not present, a default priority is used. 52 * 53 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 54 * cause it to reread its configuration file. 55 * 56 * Defined Constants: 57 * 58 * MAXLINE -- the maximimum line length that can be handled. 59 * DEFUPRI -- the default priority for user messages 60 * DEFSPRI -- the default priority for kernel messages 61 * 62 * Author: Eric Allman 63 * extensive changes by Ralph Campbell 64 * more extensive changes by Eric Allman (again) 65 * Extension to log by program name as well as facility and priority 66 * by Peter da Silva. 67 */ 68 69 #define MAXLINE 1024 /* maximum line length */ 70 #define MAXSVLINE 120 /* maximum saved line length */ 71 #define DEFUPRI (LOG_USER|LOG_NOTICE) 72 #define DEFSPRI (LOG_KERN|LOG_CRIT) 73 #define TIMERINTVL 30 /* interval for checking flush, mark */ 74 #define TTYMSGTIME 1 /* timed out passed to ttymsg */ 75 76 #include <sys/param.h> 77 #include <sys/ioctl.h> 78 #include <sys/stat.h> 79 #include <sys/wait.h> 80 #include <sys/socket.h> 81 #include <sys/msgbuf.h> 82 #include <sys/queue.h> 83 #include <sys/uio.h> 84 #include <sys/un.h> 85 #include <sys/time.h> 86 #include <sys/resource.h> 87 #include <sys/syslimits.h> 88 #include <paths.h> 89 90 #include <netinet/in.h> 91 #include <netdb.h> 92 #include <arpa/inet.h> 93 94 #include <ctype.h> 95 #include <errno.h> 96 #include <fcntl.h> 97 #include <regex.h> 98 #include <setjmp.h> 99 #include <signal.h> 100 #include <stdio.h> 101 #include <stdlib.h> 102 #include <string.h> 103 #include <sysexits.h> 104 #include <unistd.h> 105 #include <utmp.h> 106 #include "pathnames.h" 107 108 #define SYSLOG_NAMES 109 #include <sys/syslog.h> 110 111 const char *LogName = _PATH_LOG; 112 const char *ConfFile = _PATH_LOGCONF; 113 const char *PidFile = _PATH_LOGPID; 114 const char ctty[] = _PATH_CONSOLE; 115 116 #define FDMASK(fd) (1 << (fd)) 117 118 #define dprintf if (Debug) printf 119 120 #define MAXUNAMES 20 /* maximum number of user names */ 121 122 /* 123 * Flags to logmsg(). 124 */ 125 126 #define IGN_CONS 0x001 /* don't print on console */ 127 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 128 #define ADDDATE 0x004 /* add a date to the message */ 129 #define MARK 0x008 /* this message is a mark */ 130 131 /* 132 * This structure represents the files that will have log 133 * copies printed. 134 */ 135 136 struct filed { 137 struct filed *f_next; /* next in linked list */ 138 short f_type; /* entry type, see below */ 139 short f_file; /* file descriptor */ 140 time_t f_time; /* time this was last written */ 141 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 142 char *f_program; /* program this applies to */ 143 union { 144 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 145 struct { 146 char f_hname[MAXHOSTNAMELEN+1]; 147 struct sockaddr_in f_addr; 148 } f_forw; /* forwarding address */ 149 char f_fname[MAXPATHLEN]; 150 struct { 151 char f_pname[MAXPATHLEN]; 152 pid_t f_pid; 153 } f_pipe; 154 } f_un; 155 char f_prevline[MAXSVLINE]; /* last message logged */ 156 char f_lasttime[16]; /* time of last occurrence */ 157 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 158 int f_prevpri; /* pri of f_prevline */ 159 int f_prevlen; /* length of f_prevline */ 160 int f_prevcount; /* repetition cnt of prevline */ 161 int f_repeatcount; /* number of "repeated" msgs */ 162 }; 163 164 /* 165 * Queue of about-to-be dead processes we should watch out for. 166 */ 167 168 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 169 struct stailhead *deadq_headp; 170 171 struct deadq_entry { 172 pid_t dq_pid; 173 int dq_timeout; 174 TAILQ_ENTRY(deadq_entry) dq_entries; 175 }; 176 177 /* 178 * The timeout to apply to processes waiting on the dead queue. Unit 179 * of measure is `mark intervals', i.e. 20 minutes by default. 180 * Processes on the dead queue will be terminated after that time. 181 */ 182 183 #define DQ_TIMO_INIT 2 184 185 typedef struct deadq_entry *dq_t; 186 187 188 /* 189 * Struct to hold records of network addresses that are allowed to log 190 * to us. 191 */ 192 struct allowedpeer { 193 int isnumeric; 194 u_short port; 195 union { 196 struct { 197 struct in_addr addr; 198 struct in_addr mask; 199 } numeric; 200 char *name; 201 } u; 202 #define a_addr u.numeric.addr 203 #define a_mask u.numeric.mask 204 #define a_name u.name 205 }; 206 207 208 /* 209 * Intervals at which we flush out "message repeated" messages, 210 * in seconds after previous message is logged. After each flush, 211 * we move to the next interval until we reach the largest. 212 */ 213 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 214 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 215 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 216 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 217 (f)->f_repeatcount = MAXREPEAT; \ 218 } 219 220 /* values for f_type */ 221 #define F_UNUSED 0 /* unused entry */ 222 #define F_FILE 1 /* regular file */ 223 #define F_TTY 2 /* terminal */ 224 #define F_CONSOLE 3 /* console terminal */ 225 #define F_FORW 4 /* remote machine */ 226 #define F_USERS 5 /* list of users */ 227 #define F_WALL 6 /* everyone logged on */ 228 #define F_PIPE 7 /* pipe to program */ 229 230 char *TypeNames[8] = { 231 "UNUSED", "FILE", "TTY", "CONSOLE", 232 "FORW", "USERS", "WALL", "PIPE" 233 }; 234 235 struct filed *Files; 236 struct filed consfile; 237 238 int Debug; /* debug flag */ 239 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 240 char *LocalDomain; /* our local domain name */ 241 int finet; /* Internet datagram socket */ 242 int LogPort; /* port number for INET connections */ 243 int Initialized = 0; /* set when we have initialized ourselves */ 244 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 245 int MarkSeq = 0; /* mark sequence number */ 246 int SecureMode = 0; /* when true, speak only unix domain socks */ 247 248 int created_lsock = 0; /* Flag if local socket created */ 249 char bootfile[MAXLINE+1]; /* booted kernel file */ 250 251 struct allowedpeer *AllowedPeers; 252 int NumAllowed = 0; /* # of AllowedPeer entries */ 253 254 int allowaddr __P((char *)); 255 void cfline __P((char *, struct filed *, char *)); 256 char *cvthname __P((struct sockaddr_in *)); 257 void deadq_enter __P((pid_t)); 258 int decode __P((const char *, CODE *)); 259 void die __P((int)); 260 void domark __P((int)); 261 void fprintlog __P((struct filed *, int, char *)); 262 void init __P((int)); 263 void logerror __P((const char *)); 264 void logmsg __P((int, char *, char *, int)); 265 void printline __P((char *, char *)); 266 void printsys __P((char *)); 267 int p_open __P((char *, pid_t *)); 268 void reapchild __P((int)); 269 char *ttymsg __P((struct iovec *, int, char *, int)); 270 void usage __P((void)); 271 int validate __P((struct sockaddr_in *, const char *)); 272 void wallmsg __P((struct filed *, struct iovec *)); 273 int waitdaemon __P((int, int, int)); 274 void timedout __P((int)); 275 276 int 277 main(argc, argv) 278 int argc; 279 char *argv[]; 280 { 281 int ch, funix, i, inetm, fklog, klogm, len; 282 struct sockaddr_un sunx, fromunix; 283 struct sockaddr_in sin, frominet; 284 FILE *fp; 285 char *p, *hname, line[MSG_BSIZE + 1]; 286 struct timeval tv, *tvp; 287 pid_t ppid; 288 289 while ((ch = getopt(argc, argv, "a:dsf:m:p:")) != -1) 290 switch(ch) { 291 case 'd': /* debug */ 292 Debug++; 293 break; 294 case 'a': /* allow specific network addresses only */ 295 if (allowaddr(optarg) == -1) 296 usage(); 297 break; 298 case 'f': /* configuration file */ 299 ConfFile = optarg; 300 break; 301 case 'm': /* mark interval */ 302 MarkInterval = atoi(optarg) * 60; 303 break; 304 case 'p': /* path */ 305 LogName = optarg; 306 break; 307 case 's': /* no network mode */ 308 SecureMode++; 309 break; 310 case '?': 311 default: 312 usage(); 313 } 314 if ((argc -= optind) != 0) 315 usage(); 316 317 if (!Debug) { 318 ppid = waitdaemon(0, 0, 30); 319 if (ppid < 0) 320 err(1, "could not become daemon"); 321 } else 322 setlinebuf(stdout); 323 324 if (NumAllowed) 325 endservent(); 326 327 consfile.f_type = F_CONSOLE; 328 (void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1); 329 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 330 if ((p = strchr(LocalHostName, '.')) != NULL) { 331 *p++ = '\0'; 332 LocalDomain = p; 333 } else 334 LocalDomain = ""; 335 (void)strcpy(bootfile, getbootfile()); 336 (void)signal(SIGTERM, die); 337 (void)signal(SIGINT, Debug ? die : SIG_IGN); 338 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 339 (void)signal(SIGCHLD, reapchild); 340 (void)signal(SIGALRM, domark); 341 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 342 (void)alarm(TIMERINTVL); 343 344 TAILQ_INIT(&deadq_head); 345 346 #ifndef SUN_LEN 347 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 348 #endif 349 memset(&sunx, 0, sizeof(sunx)); 350 sunx.sun_family = AF_UNIX; 351 (void)strncpy(sunx.sun_path, LogName, sizeof(sunx.sun_path)); 352 (void)unlink(LogName); 353 funix = socket(AF_UNIX, SOCK_DGRAM, 0); 354 if (funix < 0 || 355 bind(funix, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 356 chmod(LogName, 0666) < 0) { 357 (void) sprintf(line, "cannot create %s", LogName); 358 logerror(line); 359 dprintf("cannot create %s (%d)\n", LogName, errno); 360 die(0); 361 } else 362 created_lsock = 1; 363 364 inetm = 0; 365 finet = socket(AF_INET, SOCK_DGRAM, 0); 366 if (finet >= 0) { 367 struct servent *sp; 368 369 sp = getservbyname("syslog", "udp"); 370 if (sp == NULL) { 371 errno = 0; 372 logerror("syslog/udp: unknown service"); 373 die(0); 374 } 375 memset(&sin, 0, sizeof(sin)); 376 sin.sin_family = AF_INET; 377 sin.sin_port = LogPort = sp->s_port; 378 379 if (!SecureMode) { 380 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 381 logerror("bind"); 382 if (!Debug) 383 die(0); 384 } else { 385 inetm = FDMASK(finet); 386 } 387 } 388 } 389 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 390 klogm = FDMASK(fklog); 391 else { 392 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 393 klogm = 0; 394 } 395 396 /* tuck my process id away */ 397 fp = fopen(PidFile, "w"); 398 if (fp != NULL) { 399 fprintf(fp, "%d\n", getpid()); 400 (void) fclose(fp); 401 } 402 403 dprintf("off & running....\n"); 404 405 init(0); 406 (void)signal(SIGHUP, init); 407 408 tvp = &tv; 409 tv.tv_sec = tv.tv_usec = 0; 410 411 for (;;) { 412 int nfds, readfds = FDMASK(funix) | inetm | klogm; 413 414 dprintf("readfds = %#x\n", readfds); 415 nfds = select(20, (fd_set *)&readfds, (fd_set *)NULL, 416 (fd_set *)NULL, tvp); 417 if (nfds == 0) { 418 if (tvp) { 419 tvp = NULL; 420 if (ppid != 1) 421 kill(ppid, SIGALRM); 422 } 423 continue; 424 } 425 if (nfds < 0) { 426 if (errno != EINTR) 427 logerror("select"); 428 continue; 429 } 430 dprintf("got a message (%d, %#x)\n", nfds, readfds); 431 if (readfds & klogm) { 432 i = read(fklog, line, sizeof(line) - 1); 433 if (i > 0) { 434 line[i] = '\0'; 435 printsys(line); 436 } else if (i < 0 && errno != EINTR) { 437 logerror("klog"); 438 fklog = -1; 439 klogm = 0; 440 } 441 } 442 if (readfds & FDMASK(funix)) { 443 len = sizeof(fromunix); 444 i = recvfrom(funix, line, MAXLINE, 0, 445 (struct sockaddr *)&fromunix, &len); 446 if (i > 0) { 447 line[i] = '\0'; 448 printline(LocalHostName, line); 449 } else if (i < 0 && errno != EINTR) 450 logerror("recvfrom unix"); 451 } 452 if (readfds & inetm) { 453 len = sizeof(frominet); 454 i = recvfrom(finet, line, MAXLINE, 0, 455 (struct sockaddr *)&frominet, &len); 456 if (i > 0) { 457 line[i] = '\0'; 458 hname = cvthname(&frominet); 459 if (validate(&frominet, hname)) 460 printline(hname, line); 461 } else if (i < 0 && errno != EINTR) 462 logerror("recvfrom inet"); 463 } 464 } 465 } 466 467 void 468 usage() 469 { 470 471 fprintf(stderr, 472 "usage: syslogd [-ds] [-f conffile] [-m markinterval]" 473 " [-p logpath] [-a allowaddr]\n"); 474 exit(1); 475 } 476 477 /* 478 * Take a raw input line, decode the message, and print the message 479 * on the appropriate log files. 480 */ 481 void 482 printline(hname, msg) 483 char *hname; 484 char *msg; 485 { 486 int c, pri; 487 char *p, *q, line[MAXLINE + 1]; 488 489 /* test for special codes */ 490 pri = DEFUPRI; 491 p = msg; 492 if (*p == '<') { 493 pri = 0; 494 while (isdigit(*++p)) 495 pri = 10 * pri + (*p - '0'); 496 if (*p == '>') 497 ++p; 498 } 499 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 500 pri = DEFUPRI; 501 502 /* don't allow users to log kernel messages */ 503 if (LOG_FAC(pri) == LOG_KERN) 504 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 505 506 q = line; 507 508 while ((c = *p++ & 0177) != '\0' && 509 q < &line[sizeof(line) - 1]) 510 if (iscntrl(c)) 511 if (c == '\n') 512 *q++ = ' '; 513 else if (c == '\t') 514 *q++ = '\t'; 515 else { 516 *q++ = '^'; 517 *q++ = c ^ 0100; 518 } 519 else 520 *q++ = c; 521 *q = '\0'; 522 523 logmsg(pri, line, hname, 0); 524 } 525 526 /* 527 * Take a raw input line from /dev/klog, split and format similar to syslog(). 528 */ 529 void 530 printsys(msg) 531 char *msg; 532 { 533 int c, pri, flags; 534 char *lp, *p, *q, line[MAXLINE + 1]; 535 536 (void)strcpy(line, bootfile); 537 (void)strcat(line, ": "); 538 lp = line + strlen(line); 539 for (p = msg; *p != '\0'; ) { 540 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 541 pri = DEFSPRI; 542 if (*p == '<') { 543 pri = 0; 544 while (isdigit(*++p)) 545 pri = 10 * pri + (*p - '0'); 546 if (*p == '>') 547 ++p; 548 } else { 549 /* kernel printf's come out on console */ 550 flags |= IGN_CONS; 551 } 552 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 553 pri = DEFSPRI; 554 q = lp; 555 while (*p != '\0' && (c = *p++) != '\n' && 556 q < &line[MAXLINE]) 557 *q++ = c; 558 *q = '\0'; 559 logmsg(pri, line, LocalHostName, flags); 560 } 561 } 562 563 time_t now; 564 565 /* 566 * Log a message to the appropriate log files, users, etc. based on 567 * the priority. 568 */ 569 void 570 logmsg(pri, msg, from, flags) 571 int pri; 572 char *msg, *from; 573 int flags; 574 { 575 struct filed *f; 576 int fac, msglen, omask, prilev; 577 char *timestamp; 578 char prog[NAME_MAX+1]; 579 int i; 580 581 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 582 pri, flags, from, msg); 583 584 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 585 586 /* 587 * Check to see if msg looks non-standard. 588 */ 589 msglen = strlen(msg); 590 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 591 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 592 flags |= ADDDATE; 593 594 (void)time(&now); 595 if (flags & ADDDATE) 596 timestamp = ctime(&now) + 4; 597 else { 598 timestamp = msg; 599 msg += 16; 600 msglen -= 16; 601 } 602 603 /* skip leading blanks */ 604 while(isspace(*msg)) { 605 msg++; 606 msglen--; 607 } 608 609 /* extract facility and priority level */ 610 if (flags & MARK) 611 fac = LOG_NFACILITIES; 612 else 613 fac = LOG_FAC(pri); 614 prilev = LOG_PRI(pri); 615 616 /* extract program name */ 617 for(i = 0; i < NAME_MAX; i++) { 618 if(!isalnum(msg[i])) 619 break; 620 prog[i] = msg[i]; 621 } 622 prog[i] = 0; 623 624 /* log the message to the particular outputs */ 625 if (!Initialized) { 626 f = &consfile; 627 f->f_file = open(ctty, O_WRONLY, 0); 628 629 if (f->f_file >= 0) { 630 fprintlog(f, flags, msg); 631 (void)close(f->f_file); 632 } 633 (void)sigsetmask(omask); 634 return; 635 } 636 for (f = Files; f; f = f->f_next) { 637 /* skip messages that are incorrect priority */ 638 if (f->f_pmask[fac] < prilev || 639 f->f_pmask[fac] == INTERNAL_NOPRI) 640 continue; 641 /* skip messages with the incorrect program name */ 642 if(f->f_program) 643 if(strcmp(prog, f->f_program) != 0) 644 continue; 645 646 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 647 continue; 648 649 /* don't output marks to recently written files */ 650 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 651 continue; 652 653 /* 654 * suppress duplicate lines to this file 655 */ 656 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 657 !strcmp(msg, f->f_prevline) && 658 !strcmp(from, f->f_prevhost)) { 659 (void)strncpy(f->f_lasttime, timestamp, 15); 660 f->f_prevcount++; 661 dprintf("msg repeated %d times, %ld sec of %d\n", 662 f->f_prevcount, now - f->f_time, 663 repeatinterval[f->f_repeatcount]); 664 /* 665 * If domark would have logged this by now, 666 * flush it now (so we don't hold isolated messages), 667 * but back off so we'll flush less often 668 * in the future. 669 */ 670 if (now > REPEATTIME(f)) { 671 fprintlog(f, flags, (char *)NULL); 672 BACKOFF(f); 673 } 674 } else { 675 /* new line, save it */ 676 if (f->f_prevcount) 677 fprintlog(f, 0, (char *)NULL); 678 f->f_repeatcount = 0; 679 f->f_prevpri = pri; 680 (void)strncpy(f->f_lasttime, timestamp, 15); 681 (void)strncpy(f->f_prevhost, from, 682 sizeof(f->f_prevhost)); 683 if (msglen < MAXSVLINE) { 684 f->f_prevlen = msglen; 685 (void)strcpy(f->f_prevline, msg); 686 fprintlog(f, flags, (char *)NULL); 687 } else { 688 f->f_prevline[0] = 0; 689 f->f_prevlen = 0; 690 fprintlog(f, flags, msg); 691 } 692 } 693 } 694 (void)sigsetmask(omask); 695 } 696 697 void 698 fprintlog(f, flags, msg) 699 struct filed *f; 700 int flags; 701 char *msg; 702 { 703 struct iovec iov[6]; 704 struct iovec *v; 705 int l; 706 char line[MAXLINE + 1], repbuf[80], greetings[200]; 707 char *msgret; 708 dq_t q; 709 710 v = iov; 711 if (f->f_type == F_WALL) { 712 v->iov_base = greetings; 713 v->iov_len = sprintf(greetings, 714 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 715 f->f_prevhost, ctime(&now)); 716 v++; 717 v->iov_base = ""; 718 v->iov_len = 0; 719 v++; 720 } else { 721 v->iov_base = f->f_lasttime; 722 v->iov_len = 15; 723 v++; 724 v->iov_base = " "; 725 v->iov_len = 1; 726 v++; 727 } 728 v->iov_base = f->f_prevhost; 729 v->iov_len = strlen(v->iov_base); 730 v++; 731 v->iov_base = " "; 732 v->iov_len = 1; 733 v++; 734 735 if (msg) { 736 v->iov_base = msg; 737 v->iov_len = strlen(msg); 738 } else if (f->f_prevcount > 1) { 739 v->iov_base = repbuf; 740 v->iov_len = sprintf(repbuf, "last message repeated %d times", 741 f->f_prevcount); 742 } else { 743 v->iov_base = f->f_prevline; 744 v->iov_len = f->f_prevlen; 745 } 746 v++; 747 748 dprintf("Logging to %s", TypeNames[f->f_type]); 749 f->f_time = now; 750 751 switch (f->f_type) { 752 case F_UNUSED: 753 dprintf("\n"); 754 break; 755 756 case F_FORW: 757 dprintf(" %s\n", f->f_un.f_forw.f_hname); 758 l = sprintf(line, "<%d>%.15s %s", f->f_prevpri, 759 iov[0].iov_base, iov[4].iov_base); 760 if (l > MAXLINE) 761 l = MAXLINE; 762 if ((finet >= 0) && 763 (sendto(finet, line, l, 0, 764 (struct sockaddr *)&f->f_un.f_forw.f_addr, 765 sizeof(f->f_un.f_forw.f_addr)) != l)) { 766 int e = errno; 767 (void)close(f->f_file); 768 f->f_type = F_UNUSED; 769 errno = e; 770 logerror("sendto"); 771 } 772 break; 773 774 case F_FILE: 775 dprintf(" %s\n", f->f_un.f_fname); 776 v->iov_base = "\n"; 777 v->iov_len = 1; 778 if (writev(f->f_file, iov, 6) < 0) { 779 int e = errno; 780 (void)close(f->f_file); 781 f->f_type = F_UNUSED; 782 errno = e; 783 logerror(f->f_un.f_fname); 784 } else if (flags & SYNC_FILE) 785 (void)fsync(f->f_file); 786 break; 787 788 case F_PIPE: 789 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 790 v->iov_base = "\n"; 791 v->iov_len = 1; 792 if (f->f_un.f_pipe.f_pid == 0) { 793 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 794 &f->f_un.f_pipe.f_pid)) < 0) { 795 f->f_type = F_UNUSED; 796 logerror(f->f_un.f_pipe.f_pname); 797 break; 798 } 799 } 800 if (writev(f->f_file, iov, 6) < 0) { 801 int e = errno; 802 (void)close(f->f_file); 803 if (f->f_un.f_pipe.f_pid > 0) 804 deadq_enter(f->f_un.f_pipe.f_pid); 805 f->f_un.f_pipe.f_pid = 0; 806 errno = e; 807 logerror(f->f_un.f_pipe.f_pname); 808 } 809 break; 810 811 case F_CONSOLE: 812 if (flags & IGN_CONS) { 813 dprintf(" (ignored)\n"); 814 break; 815 } 816 /* FALLTHROUGH */ 817 818 case F_TTY: 819 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 820 v->iov_base = "\r\n"; 821 v->iov_len = 2; 822 823 errno = 0; /* ttymsg() only sometimes returns an errno */ 824 if ((msgret = ttymsg(iov, 6, f->f_un.f_fname, 10))) { 825 f->f_type = F_UNUSED; 826 logerror(msgret); 827 } 828 break; 829 830 case F_USERS: 831 case F_WALL: 832 dprintf("\n"); 833 v->iov_base = "\r\n"; 834 v->iov_len = 2; 835 wallmsg(f, iov); 836 break; 837 } 838 f->f_prevcount = 0; 839 } 840 841 /* 842 * WALLMSG -- Write a message to the world at large 843 * 844 * Write the specified message to either the entire 845 * world, or a list of approved users. 846 */ 847 void 848 wallmsg(f, iov) 849 struct filed *f; 850 struct iovec *iov; 851 { 852 static int reenter; /* avoid calling ourselves */ 853 FILE *uf; 854 struct utmp ut; 855 int i; 856 char *p; 857 char line[sizeof(ut.ut_line) + 1]; 858 859 if (reenter++) 860 return; 861 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 862 logerror(_PATH_UTMP); 863 reenter = 0; 864 return; 865 } 866 /* NOSTRICT */ 867 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 868 if (ut.ut_name[0] == '\0') 869 continue; 870 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 871 line[sizeof(ut.ut_line)] = '\0'; 872 if (f->f_type == F_WALL) { 873 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) != NULL) { 874 errno = 0; /* already in msg */ 875 logerror(p); 876 } 877 continue; 878 } 879 /* should we send the message to this user? */ 880 for (i = 0; i < MAXUNAMES; i++) { 881 if (!f->f_un.f_uname[i][0]) 882 break; 883 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 884 UT_NAMESIZE)) { 885 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) 886 != NULL) { 887 errno = 0; /* already in msg */ 888 logerror(p); 889 } 890 break; 891 } 892 } 893 } 894 (void)fclose(uf); 895 reenter = 0; 896 } 897 898 void 899 reapchild(signo) 900 int signo; 901 { 902 int status, code; 903 pid_t pid; 904 struct filed *f; 905 char buf[256]; 906 const char *reason; 907 dq_t q; 908 909 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 910 if (!Initialized) 911 /* Don't tell while we are initting. */ 912 continue; 913 914 /* First, look if it's a process from the dead queue. */ 915 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 916 if (q->dq_pid == pid) { 917 TAILQ_REMOVE(&deadq_head, q, dq_entries); 918 free(q); 919 goto oncemore; 920 } 921 922 /* Now, look in list of active processes. */ 923 for (f = Files; f; f = f->f_next) 924 if (f->f_type == F_PIPE && 925 f->f_un.f_pipe.f_pid == pid) { 926 (void)close(f->f_file); 927 928 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 929 f->f_un.f_pipe.f_pid = 0; 930 if (WIFSIGNALED(status)) { 931 reason = "due to signal"; 932 code = WTERMSIG(status); 933 } else { 934 reason = "with status"; 935 code = WEXITSTATUS(status); 936 if (code == 0) 937 goto oncemore; /* Exited OK. */ 938 } 939 (void)snprintf(buf, sizeof buf, 940 "Logging subprocess %d (%s) exited %s %d.", 941 pid, f->f_un.f_pipe.f_pname, 942 reason, code); 943 logerror(buf); 944 break; 945 } 946 oncemore: 947 } 948 } 949 950 /* 951 * Return a printable representation of a host address. 952 */ 953 char * 954 cvthname(f) 955 struct sockaddr_in *f; 956 { 957 struct hostent *hp; 958 char *p; 959 960 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 961 962 if (f->sin_family != AF_INET) { 963 dprintf("Malformed from address\n"); 964 return ("???"); 965 } 966 hp = gethostbyaddr((char *)&f->sin_addr, 967 sizeof(struct in_addr), f->sin_family); 968 if (hp == 0) { 969 dprintf("Host name for your address (%s) unknown\n", 970 inet_ntoa(f->sin_addr)); 971 return (inet_ntoa(f->sin_addr)); 972 } 973 if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 974 *p = '\0'; 975 return (hp->h_name); 976 } 977 978 void 979 domark(signo) 980 int signo; 981 { 982 struct filed *f; 983 dq_t q; 984 985 now = time((time_t *)NULL); 986 MarkSeq += TIMERINTVL; 987 if (MarkSeq >= MarkInterval) { 988 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 989 MarkSeq = 0; 990 } 991 992 for (f = Files; f; f = f->f_next) { 993 if (f->f_prevcount && now >= REPEATTIME(f)) { 994 dprintf("flush %s: repeated %d times, %d sec.\n", 995 TypeNames[f->f_type], f->f_prevcount, 996 repeatinterval[f->f_repeatcount]); 997 fprintlog(f, 0, (char *)NULL); 998 BACKOFF(f); 999 } 1000 } 1001 1002 /* Walk the dead queue, and see if we should signal somebody. */ 1003 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1004 switch (q->dq_timeout) { 1005 case 0: 1006 /* Already signalled once, try harder now. */ 1007 kill(q->dq_pid, SIGKILL); 1008 break; 1009 1010 case 1: 1011 /* 1012 * Timed out on dead queue, send terminate 1013 * signal. Note that we leave the removal 1014 * from the dead queue to reapchild(), which 1015 * will also log the event. 1016 */ 1017 kill(q->dq_pid, SIGTERM); 1018 /* FALLTROUGH */ 1019 1020 default: 1021 q->dq_timeout--; 1022 } 1023 1024 (void)alarm(TIMERINTVL); 1025 } 1026 1027 /* 1028 * Print syslogd errors some place. 1029 */ 1030 void 1031 logerror(type) 1032 const char *type; 1033 { 1034 char buf[512]; 1035 1036 if (errno) 1037 (void)snprintf(buf, 1038 sizeof(buf), "syslogd: %s: %s", type, strerror(errno)); 1039 else 1040 (void)snprintf(buf, sizeof(buf), "syslogd: %s", type); 1041 errno = 0; 1042 dprintf("%s\n", buf); 1043 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1044 } 1045 1046 void 1047 die(signo) 1048 int signo; 1049 { 1050 struct filed *f; 1051 int was_initialized; 1052 char buf[100]; 1053 1054 was_initialized = Initialized; 1055 Initialized = 0; /* Don't log SIGCHLDs. */ 1056 for (f = Files; f != NULL; f = f->f_next) { 1057 /* flush any pending output */ 1058 if (f->f_prevcount) 1059 fprintlog(f, 0, (char *)NULL); 1060 if (f->f_type == F_PIPE) 1061 (void)close(f->f_file); 1062 } 1063 Initialized = was_initialized; 1064 if (signo) { 1065 dprintf("syslogd: exiting on signal %d\n", signo); 1066 (void)sprintf(buf, "exiting on signal %d", signo); 1067 errno = 0; 1068 logerror(buf); 1069 } 1070 if (created_lsock) 1071 (void)unlink(LogName); 1072 exit(1); 1073 } 1074 1075 /* 1076 * INIT -- Initialize syslogd from configuration table 1077 */ 1078 void 1079 init(signo) 1080 int signo; 1081 { 1082 int i; 1083 FILE *cf; 1084 struct filed *f, *next, **nextp; 1085 char *p; 1086 char cline[LINE_MAX]; 1087 char prog[NAME_MAX+1]; 1088 1089 dprintf("init\n"); 1090 1091 /* 1092 * Close all open log files. 1093 */ 1094 Initialized = 0; 1095 for (f = Files; f != NULL; f = next) { 1096 /* flush any pending output */ 1097 if (f->f_prevcount) 1098 fprintlog(f, 0, (char *)NULL); 1099 1100 switch (f->f_type) { 1101 case F_FILE: 1102 case F_FORW: 1103 case F_CONSOLE: 1104 case F_TTY: 1105 (void)close(f->f_file); 1106 break; 1107 case F_PIPE: 1108 (void)close(f->f_file); 1109 if (f->f_un.f_pipe.f_pid > 0) 1110 deadq_enter(f->f_un.f_pipe.f_pid); 1111 f->f_un.f_pipe.f_pid = 0; 1112 break; 1113 } 1114 next = f->f_next; 1115 if(f->f_program) free(f->f_program); 1116 free((char *)f); 1117 } 1118 Files = NULL; 1119 nextp = &Files; 1120 1121 /* open the configuration file */ 1122 if ((cf = fopen(ConfFile, "r")) == NULL) { 1123 dprintf("cannot open %s\n", ConfFile); 1124 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1125 cfline("*.ERR\t/dev/console", *nextp, "*"); 1126 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1127 cfline("*.PANIC\t*", (*nextp)->f_next, "*"); 1128 Initialized = 1; 1129 return; 1130 } 1131 1132 /* 1133 * Foreach line in the conf table, open that file. 1134 */ 1135 f = NULL; 1136 strcpy(prog, "*"); 1137 while (fgets(cline, sizeof(cline), cf) != NULL) { 1138 /* 1139 * check for end-of-section, comments, strip off trailing 1140 * spaces and newline character. #!prog is treated specially: 1141 * following lines apply only to that program. 1142 */ 1143 for (p = cline; isspace(*p); ++p) 1144 continue; 1145 if (*p == 0) 1146 continue; 1147 if(*p == '#') { 1148 p++; 1149 if(*p!='!') 1150 continue; 1151 } 1152 if(*p=='!') { 1153 p++; 1154 while(isspace(*p)) p++; 1155 if(!*p) { 1156 strcpy(prog, "*"); 1157 continue; 1158 } 1159 for(i = 0; i < NAME_MAX; i++) { 1160 if(!isalnum(p[i])) 1161 break; 1162 prog[i] = p[i]; 1163 } 1164 prog[i] = 0; 1165 continue; 1166 } 1167 for (p = strchr(cline, '\0'); isspace(*--p);) 1168 continue; 1169 *++p = '\0'; 1170 f = (struct filed *)calloc(1, sizeof(*f)); 1171 *nextp = f; 1172 nextp = &f->f_next; 1173 cfline(cline, f, prog); 1174 } 1175 1176 /* close the configuration file */ 1177 (void)fclose(cf); 1178 1179 Initialized = 1; 1180 1181 if (Debug) { 1182 for (f = Files; f; f = f->f_next) { 1183 for (i = 0; i <= LOG_NFACILITIES; i++) 1184 if (f->f_pmask[i] == INTERNAL_NOPRI) 1185 printf("X "); 1186 else 1187 printf("%d ", f->f_pmask[i]); 1188 printf("%s: ", TypeNames[f->f_type]); 1189 switch (f->f_type) { 1190 case F_FILE: 1191 printf("%s", f->f_un.f_fname); 1192 break; 1193 1194 case F_CONSOLE: 1195 case F_TTY: 1196 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1197 break; 1198 1199 case F_FORW: 1200 printf("%s", f->f_un.f_forw.f_hname); 1201 break; 1202 1203 case F_PIPE: 1204 printf("%s", f->f_un.f_pipe.f_pname); 1205 break; 1206 1207 case F_USERS: 1208 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1209 printf("%s, ", f->f_un.f_uname[i]); 1210 break; 1211 } 1212 if(f->f_program) { 1213 printf(" (%s)", f->f_program); 1214 } 1215 printf("\n"); 1216 } 1217 } 1218 1219 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1220 dprintf("syslogd: restarted\n"); 1221 } 1222 1223 /* 1224 * Crack a configuration file line 1225 */ 1226 void 1227 cfline(line, f, prog) 1228 char *line; 1229 struct filed *f; 1230 char *prog; 1231 { 1232 struct hostent *hp; 1233 int i, pri; 1234 char *bp, *p, *q; 1235 char buf[MAXLINE], ebuf[100]; 1236 1237 dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog); 1238 1239 errno = 0; /* keep strerror() stuff out of logerror messages */ 1240 1241 /* clear out file entry */ 1242 memset(f, 0, sizeof(*f)); 1243 for (i = 0; i <= LOG_NFACILITIES; i++) 1244 f->f_pmask[i] = INTERNAL_NOPRI; 1245 1246 /* save program name if any */ 1247 if(prog && *prog=='*') prog = NULL; 1248 if(prog) { 1249 f->f_program = calloc(1, strlen(prog)+1); 1250 if(f->f_program) { 1251 strcpy(f->f_program, prog); 1252 } 1253 } 1254 1255 /* scan through the list of selectors */ 1256 for (p = line; *p && *p != '\t';) { 1257 1258 /* find the end of this facility name list */ 1259 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1260 continue; 1261 1262 /* collect priority name */ 1263 for (bp = buf; *q && !strchr("\t,;", *q); ) 1264 *bp++ = *q++; 1265 *bp = '\0'; 1266 1267 /* skip cruft */ 1268 while (strchr(", ;", *q)) 1269 q++; 1270 1271 /* decode priority name */ 1272 if (*buf == '*') 1273 pri = LOG_PRIMASK + 1; 1274 else { 1275 pri = decode(buf, prioritynames); 1276 if (pri < 0) { 1277 (void)sprintf(ebuf, 1278 "unknown priority name \"%s\"", buf); 1279 logerror(ebuf); 1280 return; 1281 } 1282 } 1283 1284 /* scan facilities */ 1285 while (*p && !strchr("\t.;", *p)) { 1286 for (bp = buf; *p && !strchr("\t,;.", *p); ) 1287 *bp++ = *p++; 1288 *bp = '\0'; 1289 if (*buf == '*') 1290 for (i = 0; i < LOG_NFACILITIES; i++) 1291 f->f_pmask[i] = pri; 1292 else { 1293 i = decode(buf, facilitynames); 1294 if (i < 0) { 1295 (void)sprintf(ebuf, 1296 "unknown facility name \"%s\"", 1297 buf); 1298 logerror(ebuf); 1299 return; 1300 } 1301 f->f_pmask[i >> 3] = pri; 1302 } 1303 while (*p == ',' || *p == ' ') 1304 p++; 1305 } 1306 1307 p = q; 1308 } 1309 1310 /* skip to action part */ 1311 while (*p == '\t') 1312 p++; 1313 1314 switch (*p) 1315 { 1316 case '@': 1317 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1318 hp = gethostbyname(p); 1319 if (hp == NULL) { 1320 extern int h_errno; 1321 1322 logerror(hstrerror(h_errno)); 1323 break; 1324 } 1325 memset(&f->f_un.f_forw.f_addr, 0, 1326 sizeof(f->f_un.f_forw.f_addr)); 1327 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1328 f->f_un.f_forw.f_addr.sin_port = LogPort; 1329 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1330 f->f_type = F_FORW; 1331 break; 1332 1333 case '/': 1334 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1335 f->f_type = F_UNUSED; 1336 logerror(p); 1337 break; 1338 } 1339 if (isatty(f->f_file)) { 1340 if (strcmp(p, ctty) == 0) 1341 f->f_type = F_CONSOLE; 1342 else 1343 f->f_type = F_TTY; 1344 (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); 1345 } else { 1346 (void)strcpy(f->f_un.f_fname, p); 1347 f->f_type = F_FILE; 1348 } 1349 break; 1350 1351 case '|': 1352 f->f_un.f_pipe.f_pid = 0; 1353 (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); 1354 f->f_type = F_PIPE; 1355 break; 1356 1357 case '*': 1358 f->f_type = F_WALL; 1359 break; 1360 1361 default: 1362 for (i = 0; i < MAXUNAMES && *p; i++) { 1363 for (q = p; *q && *q != ','; ) 1364 q++; 1365 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1366 if ((q - p) > UT_NAMESIZE) 1367 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1368 else 1369 f->f_un.f_uname[i][q - p] = '\0'; 1370 while (*q == ',' || *q == ' ') 1371 q++; 1372 p = q; 1373 } 1374 f->f_type = F_USERS; 1375 break; 1376 } 1377 } 1378 1379 1380 /* 1381 * Decode a symbolic name to a numeric value 1382 */ 1383 int 1384 decode(name, codetab) 1385 const char *name; 1386 CODE *codetab; 1387 { 1388 CODE *c; 1389 char *p, buf[40]; 1390 1391 if (isdigit(*name)) 1392 return (atoi(name)); 1393 1394 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1395 if (isupper(*name)) 1396 *p = tolower(*name); 1397 else 1398 *p = *name; 1399 } 1400 *p = '\0'; 1401 for (c = codetab; c->c_name; c++) 1402 if (!strcmp(buf, c->c_name)) 1403 return (c->c_val); 1404 1405 return (-1); 1406 } 1407 1408 /* 1409 * fork off and become a daemon, but wait for the child to come online 1410 * before returing to the parent, or we get disk thrashing at boot etc. 1411 * Set a timer so we don't hang forever if it wedges. 1412 */ 1413 int 1414 waitdaemon(nochdir, noclose, maxwait) 1415 int nochdir, noclose, maxwait; 1416 { 1417 int fd; 1418 int status; 1419 pid_t pid, childpid; 1420 1421 switch (childpid = fork()) { 1422 case -1: 1423 return (-1); 1424 case 0: 1425 break; 1426 default: 1427 signal(SIGALRM, timedout); 1428 alarm(maxwait); 1429 while ((pid = wait3(&status, 0, NULL)) != -1) { 1430 if (WIFEXITED(status)) 1431 errx(1, "child pid %d exited with return code %d", 1432 pid, WEXITSTATUS(status)); 1433 if (WIFSIGNALED(status)) 1434 errx(1, "child pid %d exited on signal %d%s", 1435 pid, WTERMSIG(status), 1436 WCOREDUMP(status) ? " (core dumped)" : 1437 ""); 1438 if (pid == childpid) /* it's gone... */ 1439 break; 1440 } 1441 exit(0); 1442 } 1443 1444 if (setsid() == -1) 1445 return (-1); 1446 1447 if (!nochdir) 1448 (void)chdir("/"); 1449 1450 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1451 (void)dup2(fd, STDIN_FILENO); 1452 (void)dup2(fd, STDOUT_FILENO); 1453 (void)dup2(fd, STDERR_FILENO); 1454 if (fd > 2) 1455 (void)close (fd); 1456 } 1457 return (getppid()); 1458 } 1459 1460 /* 1461 * We get a SIGALRM from the child when it's running and finished doing it's 1462 * fsync()'s or O_SYNC writes for all the boot messages. 1463 * 1464 * We also get a signal from the kernel if the timer expires, so check to 1465 * see what happened. 1466 */ 1467 void 1468 timedout(sig) 1469 int sig __unused; 1470 { 1471 int left; 1472 left = alarm(0); 1473 signal(SIGALRM, SIG_DFL); 1474 if (left == 0) 1475 errx(1, "timed out waiting for child"); 1476 else 1477 exit(0); 1478 } 1479 1480 /* 1481 * Add `s' to the list of allowable peer addresses to accept messages 1482 * from. 1483 * 1484 * `s' is a string in the form: 1485 * 1486 * [*]domainname[:{servicename|portnumber|*}] 1487 * 1488 * or 1489 * 1490 * netaddr/maskbits[:{servicename|portnumber|*}] 1491 * 1492 * Returns -1 on error, 0 if the argument was valid. 1493 */ 1494 int 1495 allowaddr(s) 1496 char *s; 1497 { 1498 char *cp1, *cp2; 1499 struct allowedpeer ap; 1500 struct servent *se; 1501 regex_t re; 1502 int i; 1503 1504 if ((cp1 = strrchr(s, ':'))) { 1505 /* service/port provided */ 1506 *cp1++ = '\0'; 1507 if (strlen(cp1) == 1 && *cp1 == '*') 1508 /* any port allowed */ 1509 ap.port = htons(0); 1510 else if ((se = getservbyname(cp1, "udp"))) 1511 ap.port = se->s_port; 1512 else { 1513 ap.port = htons((int)strtol(cp1, &cp2, 0)); 1514 if (*cp2 != '\0') 1515 return -1; /* port not numeric */ 1516 } 1517 } else { 1518 if ((se = getservbyname("syslog", "udp"))) 1519 ap.port = se->s_port; 1520 else 1521 /* sanity, should not happen */ 1522 ap.port = htons(514); 1523 } 1524 1525 /* the regexp's are ugly, but the cleanest way */ 1526 1527 if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$", 1528 REG_EXTENDED)) 1529 /* if RE compilation fails, that's an internal error */ 1530 abort(); 1531 if (regexec(&re, s, 0, 0, 0) == 0) { 1532 /* arg `s' is numeric */ 1533 ap.isnumeric = 1; 1534 if ((cp1 = strchr(s, '/')) != NULL) { 1535 *cp1++ = '\0'; 1536 i = atoi(cp1); 1537 if (i < 0 || i > 32) 1538 return -1; 1539 /* convert masklen to netmask */ 1540 ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1)); 1541 } 1542 if (ascii2addr(AF_INET, s, &ap.a_addr) == -1) 1543 return -1; 1544 if (cp1 == NULL) { 1545 /* use default netmask */ 1546 if (IN_CLASSA(ntohl(ap.a_addr.s_addr))) 1547 ap.a_mask.s_addr = htonl(IN_CLASSA_NET); 1548 else if (IN_CLASSB(ntohl(ap.a_addr.s_addr))) 1549 ap.a_mask.s_addr = htonl(IN_CLASSB_NET); 1550 else 1551 ap.a_mask.s_addr = htonl(IN_CLASSC_NET); 1552 } 1553 } else { 1554 /* arg `s' is domain name */ 1555 ap.isnumeric = 0; 1556 ap.a_name = s; 1557 } 1558 regfree(&re); 1559 1560 if (Debug) { 1561 printf("allowaddr: rule %d: ", NumAllowed); 1562 if (ap.isnumeric) { 1563 printf("numeric, "); 1564 printf("addr = %s, ", 1565 addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0)); 1566 printf("mask = %s; ", 1567 addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0)); 1568 } else 1569 printf("domainname = %s; ", ap.a_name); 1570 printf("port = %d\n", ntohs(ap.port)); 1571 } 1572 1573 if ((AllowedPeers = realloc(AllowedPeers, 1574 ++NumAllowed * sizeof(struct allowedpeer))) 1575 == NULL) { 1576 fprintf(stderr, "Out of memory!\n"); 1577 exit(EX_OSERR); 1578 } 1579 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 1580 return 0; 1581 } 1582 1583 /* 1584 * Validate that the remote peer has permission to log to us. 1585 */ 1586 int 1587 validate(sin, hname) 1588 struct sockaddr_in *sin; 1589 const char *hname; 1590 { 1591 int i; 1592 size_t l1, l2; 1593 char *cp, name[MAXHOSTNAMELEN]; 1594 struct allowedpeer *ap; 1595 1596 if (NumAllowed == 0) 1597 /* traditional behaviour, allow everything */ 1598 return 1; 1599 1600 strncpy(name, hname, sizeof name); 1601 if (strchr(name, '.') == NULL) { 1602 strncat(name, ".", sizeof name - strlen(name) - 1); 1603 strncat(name, LocalDomain, sizeof name - strlen(name) - 1); 1604 } 1605 dprintf("validate: dgram from IP %s, port %d, name %s;\n", 1606 addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0), 1607 ntohs(sin->sin_port), name); 1608 1609 /* now, walk down the list */ 1610 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 1611 if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) { 1612 dprintf("rejected in rule %d due to port mismatch.\n", i); 1613 continue; 1614 } 1615 1616 if (ap->isnumeric) { 1617 if ((sin->sin_addr.s_addr & ap->a_mask.s_addr) 1618 != ap->a_addr.s_addr) { 1619 dprintf("rejected in rule %d due to IP mismatch.\n", i); 1620 continue; 1621 } 1622 } else { 1623 cp = ap->a_name; 1624 l1 = strlen(name); 1625 if (*cp == '*') { 1626 /* allow wildmatch */ 1627 cp++; 1628 l2 = strlen(cp); 1629 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 1630 dprintf("rejected in rule %d due to name mismatch.\n", i); 1631 continue; 1632 } 1633 } else { 1634 /* exact match */ 1635 l2 = strlen(cp); 1636 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 1637 dprintf("rejected in rule %d due to name mismatch.\n", i); 1638 continue; 1639 } 1640 } 1641 } 1642 dprintf("accepted in rule %d.\n", i); 1643 return 1; /* hooray! */ 1644 } 1645 return 0; 1646 } 1647 1648 /* 1649 * Fairly similar to popen(3), but returns an open descriptor, as 1650 * opposed to a FILE *. 1651 */ 1652 int 1653 p_open(prog, pid) 1654 char *prog; 1655 pid_t *pid; 1656 { 1657 int pfd[2], nulldesc, i; 1658 sigset_t omask, mask; 1659 char *argv[4]; /* sh -c cmd NULL */ 1660 char errmsg[200]; 1661 1662 if (pipe(pfd) == -1) 1663 return -1; 1664 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 1665 /* we are royally screwed anyway */ 1666 return -1; 1667 1668 mask = sigmask(SIGALRM) | sigmask(SIGHUP); 1669 sigprocmask(SIG_BLOCK, &omask, &mask); 1670 switch ((*pid = fork())) { 1671 case -1: 1672 sigprocmask(SIG_SETMASK, 0, &omask); 1673 close(nulldesc); 1674 return -1; 1675 1676 case 0: 1677 argv[0] = "sh"; 1678 argv[1] = "-c"; 1679 argv[2] = prog; 1680 argv[3] = NULL; 1681 1682 alarm(0); 1683 (void)setsid(); /* Avoid catching SIGHUPs. */ 1684 1685 /* 1686 * Throw away pending signals, and reset signal 1687 * behaviour to standard values. 1688 */ 1689 signal(SIGALRM, SIG_IGN); 1690 signal(SIGHUP, SIG_IGN); 1691 sigprocmask(SIG_SETMASK, 0, &omask); 1692 signal(SIGPIPE, SIG_DFL); 1693 signal(SIGQUIT, SIG_DFL); 1694 signal(SIGALRM, SIG_DFL); 1695 signal(SIGHUP, SIG_DFL); 1696 1697 dup2(pfd[0], STDIN_FILENO); 1698 dup2(nulldesc, STDOUT_FILENO); 1699 dup2(nulldesc, STDERR_FILENO); 1700 for (i = getdtablesize(); i > 2; i--) 1701 (void) close(i); 1702 1703 (void) execvp(_PATH_BSHELL, argv); 1704 _exit(255); 1705 } 1706 1707 sigprocmask(SIG_SETMASK, 0, &omask); 1708 close(nulldesc); 1709 close(pfd[0]); 1710 /* 1711 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 1712 * supposed to get an EWOULDBLOCK on writev(2), which is 1713 * caught by the logic above anyway, which will in turn close 1714 * the pipe, and fork a new logging subprocess if necessary. 1715 * The stale subprocess will be killed some time later unless 1716 * it terminated itself due to closing its input pipe (so we 1717 * get rid of really dead puppies). 1718 */ 1719 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 1720 /* This is bad. */ 1721 (void)snprintf(errmsg, sizeof errmsg, 1722 "Warning: cannot change pipe to PID %d to " 1723 "non-blocking behaviour.", 1724 (int)*pid); 1725 logerror(errmsg); 1726 } 1727 return pfd[1]; 1728 } 1729 1730 void 1731 deadq_enter(pid) 1732 pid_t pid; 1733 { 1734 dq_t p; 1735 1736 p = malloc(sizeof(struct deadq_entry)); 1737 if (p == 0) { 1738 errno = 0; 1739 logerror("panic: out of virtual memory!"); 1740 exit(1); 1741 } 1742 1743 p->dq_pid = pid; 1744 p->dq_timeout = DQ_TIMO_INIT; 1745 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 1746 } 1747