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 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 43 #endif 44 static const char rcsid[] = 45 "$Id$"; 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> 114 115 const char *LogName = _PATH_LOG; 116 const char *ConfFile = _PATH_LOGCONF; 117 const char *PidFile = _PATH_LOGPID; 118 const 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 */ 139 140 struct 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 */ 171 172 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 173 struct stailhead *deadq_headp; 174 175 struct 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 2 188 189 typedef 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 */ 196 struct 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 */ 217 int 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 */ 233 234 char *TypeNames[8] = { 235 "UNUSED", "FILE", "TTY", "CONSOLE", 236 "FORW", "USERS", "WALL", "PIPE" 237 }; 238 239 struct filed *Files; 240 struct filed consfile; 241 242 int Debug; /* debug flag */ 243 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 244 char *LocalDomain; /* our local domain name */ 245 int finet; /* Internet datagram socket */ 246 int LogPort; /* port number for INET connections */ 247 int Initialized = 0; /* set when we have initialized ourselves */ 248 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 249 int MarkSeq = 0; /* mark sequence number */ 250 int SecureMode = 0; /* when true, speak only unix domain socks */ 251 252 int created_lsock = 0; /* Flag if local socket created */ 253 char bootfile[MAXLINE+1]; /* booted kernel file */ 254 255 struct allowedpeer *AllowedPeers; 256 int NumAllowed = 0; /* # of AllowedPeer entries */ 257 258 int allowaddr __P((char *)); 259 void cfline __P((char *, struct filed *, char *)); 260 char *cvthname __P((struct sockaddr_in *)); 261 void deadq_enter __P((pid_t)); 262 int decode __P((const char *, CODE *)); 263 void die __P((int)); 264 void domark __P((int)); 265 void fprintlog __P((struct filed *, int, char *)); 266 void init __P((int)); 267 void logerror __P((const char *)); 268 void logmsg __P((int, char *, char *, int)); 269 void printline __P((char *, char *)); 270 void printsys __P((char *)); 271 int p_open __P((char *, pid_t *)); 272 void reapchild __P((int)); 273 char *ttymsg __P((struct iovec *, int, char *, int)); 274 static void usage __P((void)); 275 int validate __P((struct sockaddr_in *, const char *)); 276 void wallmsg __P((struct filed *, struct iovec *)); 277 int waitdaemon __P((int, int, int)); 278 void timedout __P((int)); 279 280 int 281 main(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 finet = socket(AF_INET, SOCK_DGRAM, 0); 370 if (finet >= 0) { 371 struct servent *sp; 372 373 sp = getservbyname("syslog", "udp"); 374 if (sp == NULL) { 375 errno = 0; 376 logerror("syslog/udp: unknown service"); 377 die(0); 378 } 379 memset(&sin, 0, sizeof(sin)); 380 sin.sin_family = AF_INET; 381 sin.sin_port = LogPort = sp->s_port; 382 383 if (!SecureMode) { 384 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 385 logerror("bind"); 386 if (!Debug) 387 die(0); 388 } else { 389 inetm = FDMASK(finet); 390 } 391 } 392 } 393 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 394 klogm = FDMASK(fklog); 395 else { 396 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 397 klogm = 0; 398 } 399 400 /* tuck my process id away */ 401 fp = fopen(PidFile, "w"); 402 if (fp != NULL) { 403 fprintf(fp, "%d\n", getpid()); 404 (void) fclose(fp); 405 } 406 407 dprintf("off & running....\n"); 408 409 init(0); 410 (void)signal(SIGHUP, init); 411 412 tvp = &tv; 413 tv.tv_sec = tv.tv_usec = 0; 414 415 for (;;) { 416 int nfds, readfds = FDMASK(funix) | inetm | klogm; 417 418 dprintf("readfds = %#x\n", readfds); 419 nfds = select(20, (fd_set *)&readfds, (fd_set *)NULL, 420 (fd_set *)NULL, tvp); 421 if (nfds == 0) { 422 if (tvp) { 423 tvp = NULL; 424 if (ppid != 1) 425 kill(ppid, SIGALRM); 426 } 427 continue; 428 } 429 if (nfds < 0) { 430 if (errno != EINTR) 431 logerror("select"); 432 continue; 433 } 434 dprintf("got a message (%d, %#x)\n", nfds, readfds); 435 if (readfds & klogm) { 436 i = read(fklog, line, sizeof(line) - 1); 437 if (i > 0) { 438 line[i] = '\0'; 439 printsys(line); 440 } else if (i < 0 && errno != EINTR) { 441 logerror("klog"); 442 fklog = -1; 443 klogm = 0; 444 } 445 } 446 if (readfds & FDMASK(funix)) { 447 len = sizeof(fromunix); 448 i = recvfrom(funix, line, MAXLINE, 0, 449 (struct sockaddr *)&fromunix, &len); 450 if (i > 0) { 451 line[i] = '\0'; 452 printline(LocalHostName, line); 453 } else if (i < 0 && errno != EINTR) 454 logerror("recvfrom unix"); 455 } 456 if (readfds & inetm) { 457 len = sizeof(frominet); 458 i = recvfrom(finet, line, MAXLINE, 0, 459 (struct sockaddr *)&frominet, &len); 460 if (i > 0) { 461 line[i] = '\0'; 462 hname = cvthname(&frominet); 463 if (validate(&frominet, hname)) 464 printline(hname, line); 465 } else if (i < 0 && errno != EINTR) 466 logerror("recvfrom inet"); 467 } 468 } 469 } 470 471 static void 472 usage() 473 { 474 475 fprintf(stderr, "%s\n%s\n", 476 "usage: syslogd [-ds] [-a allowed_peer] [-f config_file]", 477 " [-m mark_interval] [-p log_socket]"); 478 exit(1); 479 } 480 481 /* 482 * Take a raw input line, decode the message, and print the message 483 * on the appropriate log files. 484 */ 485 void 486 printline(hname, msg) 487 char *hname; 488 char *msg; 489 { 490 int c, pri; 491 char *p, *q, line[MAXLINE + 1]; 492 493 /* test for special codes */ 494 pri = DEFUPRI; 495 p = msg; 496 if (*p == '<') { 497 pri = 0; 498 while (isdigit(*++p)) 499 pri = 10 * pri + (*p - '0'); 500 if (*p == '>') 501 ++p; 502 } 503 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 504 pri = DEFUPRI; 505 506 /* don't allow users to log kernel messages */ 507 if (LOG_FAC(pri) == LOG_KERN) 508 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 509 510 q = line; 511 512 while ((c = *p++ & 0177) != '\0' && 513 q < &line[sizeof(line) - 1]) 514 if (iscntrl(c)) 515 if (c == '\n') 516 *q++ = ' '; 517 else if (c == '\t') 518 *q++ = '\t'; 519 else { 520 *q++ = '^'; 521 *q++ = c ^ 0100; 522 } 523 else 524 *q++ = c; 525 *q = '\0'; 526 527 logmsg(pri, line, hname, 0); 528 } 529 530 /* 531 * Take a raw input line from /dev/klog, split and format similar to syslog(). 532 */ 533 void 534 printsys(msg) 535 char *msg; 536 { 537 int c, pri, flags; 538 char *lp, *p, *q, line[MAXLINE + 1]; 539 540 (void)strcpy(line, bootfile); 541 (void)strcat(line, ": "); 542 lp = line + strlen(line); 543 for (p = msg; *p != '\0'; ) { 544 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 545 pri = DEFSPRI; 546 if (*p == '<') { 547 pri = 0; 548 while (isdigit(*++p)) 549 pri = 10 * pri + (*p - '0'); 550 if (*p == '>') 551 ++p; 552 } else { 553 /* kernel printf's come out on console */ 554 flags |= IGN_CONS; 555 } 556 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 557 pri = DEFSPRI; 558 q = lp; 559 while (*p != '\0' && (c = *p++) != '\n' && 560 q < &line[MAXLINE]) 561 *q++ = c; 562 *q = '\0'; 563 logmsg(pri, line, LocalHostName, flags); 564 } 565 } 566 567 time_t now; 568 569 /* 570 * Log a message to the appropriate log files, users, etc. based on 571 * the priority. 572 */ 573 void 574 logmsg(pri, msg, from, flags) 575 int pri; 576 char *msg, *from; 577 int flags; 578 { 579 struct filed *f; 580 int fac, msglen, omask, prilev; 581 char *timestamp; 582 char prog[NAME_MAX+1]; 583 int i; 584 585 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 586 pri, flags, from, msg); 587 588 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 589 590 /* 591 * Check to see if msg looks non-standard. 592 */ 593 msglen = strlen(msg); 594 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 595 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 596 flags |= ADDDATE; 597 598 (void)time(&now); 599 if (flags & ADDDATE) 600 timestamp = ctime(&now) + 4; 601 else { 602 timestamp = msg; 603 msg += 16; 604 msglen -= 16; 605 } 606 607 /* skip leading blanks */ 608 while(isspace(*msg)) { 609 msg++; 610 msglen--; 611 } 612 613 /* extract facility and priority level */ 614 if (flags & MARK) 615 fac = LOG_NFACILITIES; 616 else 617 fac = LOG_FAC(pri); 618 prilev = LOG_PRI(pri); 619 620 /* extract program name */ 621 for(i = 0; i < NAME_MAX; i++) { 622 if(!isalnum(msg[i])) 623 break; 624 prog[i] = msg[i]; 625 } 626 prog[i] = 0; 627 628 /* log the message to the particular outputs */ 629 if (!Initialized) { 630 f = &consfile; 631 f->f_file = open(ctty, O_WRONLY, 0); 632 633 if (f->f_file >= 0) { 634 fprintlog(f, flags, msg); 635 (void)close(f->f_file); 636 } 637 (void)sigsetmask(omask); 638 return; 639 } 640 for (f = Files; f; f = f->f_next) { 641 /* skip messages that are incorrect priority */ 642 if (f->f_pmask[fac] < prilev || 643 f->f_pmask[fac] == INTERNAL_NOPRI) 644 continue; 645 /* skip messages with the incorrect program name */ 646 if(f->f_program) 647 if(strcmp(prog, f->f_program) != 0) 648 continue; 649 650 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 651 continue; 652 653 /* don't output marks to recently written files */ 654 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 655 continue; 656 657 /* 658 * suppress duplicate lines to this file 659 */ 660 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 661 !strcmp(msg, f->f_prevline) && 662 !strcmp(from, f->f_prevhost)) { 663 (void)strncpy(f->f_lasttime, timestamp, 15); 664 f->f_prevcount++; 665 dprintf("msg repeated %d times, %ld sec of %d\n", 666 f->f_prevcount, now - f->f_time, 667 repeatinterval[f->f_repeatcount]); 668 /* 669 * If domark would have logged this by now, 670 * flush it now (so we don't hold isolated messages), 671 * but back off so we'll flush less often 672 * in the future. 673 */ 674 if (now > REPEATTIME(f)) { 675 fprintlog(f, flags, (char *)NULL); 676 BACKOFF(f); 677 } 678 } else { 679 /* new line, save it */ 680 if (f->f_prevcount) 681 fprintlog(f, 0, (char *)NULL); 682 f->f_repeatcount = 0; 683 f->f_prevpri = pri; 684 (void)strncpy(f->f_lasttime, timestamp, 15); 685 (void)strncpy(f->f_prevhost, from, 686 sizeof(f->f_prevhost)); 687 if (msglen < MAXSVLINE) { 688 f->f_prevlen = msglen; 689 (void)strcpy(f->f_prevline, msg); 690 fprintlog(f, flags, (char *)NULL); 691 } else { 692 f->f_prevline[0] = 0; 693 f->f_prevlen = 0; 694 fprintlog(f, flags, msg); 695 } 696 } 697 } 698 (void)sigsetmask(omask); 699 } 700 701 void 702 fprintlog(f, flags, msg) 703 struct filed *f; 704 int flags; 705 char *msg; 706 { 707 struct iovec iov[6]; 708 struct iovec *v; 709 int l; 710 char line[MAXLINE + 1], repbuf[80], greetings[200]; 711 char *msgret; 712 713 v = iov; 714 if (f->f_type == F_WALL) { 715 v->iov_base = greetings; 716 v->iov_len = snprintf(greetings, sizeof greetings, 717 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 718 f->f_prevhost, ctime(&now)); 719 v++; 720 v->iov_base = ""; 721 v->iov_len = 0; 722 v++; 723 } else { 724 v->iov_base = f->f_lasttime; 725 v->iov_len = 15; 726 v++; 727 v->iov_base = " "; 728 v->iov_len = 1; 729 v++; 730 } 731 v->iov_base = f->f_prevhost; 732 v->iov_len = strlen(v->iov_base); 733 v++; 734 v->iov_base = " "; 735 v->iov_len = 1; 736 v++; 737 738 if (msg) { 739 v->iov_base = msg; 740 v->iov_len = strlen(msg); 741 } else if (f->f_prevcount > 1) { 742 v->iov_base = repbuf; 743 v->iov_len = sprintf(repbuf, "last message repeated %d times", 744 f->f_prevcount); 745 } else { 746 v->iov_base = f->f_prevline; 747 v->iov_len = f->f_prevlen; 748 } 749 v++; 750 751 dprintf("Logging to %s", TypeNames[f->f_type]); 752 f->f_time = now; 753 754 switch (f->f_type) { 755 case F_UNUSED: 756 dprintf("\n"); 757 break; 758 759 case F_FORW: 760 dprintf(" %s\n", f->f_un.f_forw.f_hname); 761 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 762 f->f_prevpri, iov[0].iov_base, iov[4].iov_base); 763 if (l > MAXLINE) 764 l = MAXLINE; 765 if ((finet >= 0) && 766 (sendto(finet, line, l, 0, 767 (struct sockaddr *)&f->f_un.f_forw.f_addr, 768 sizeof(f->f_un.f_forw.f_addr)) != l)) { 769 int e = errno; 770 (void)close(f->f_file); 771 f->f_type = F_UNUSED; 772 errno = e; 773 logerror("sendto"); 774 } 775 break; 776 777 case F_FILE: 778 dprintf(" %s\n", f->f_un.f_fname); 779 v->iov_base = "\n"; 780 v->iov_len = 1; 781 if (writev(f->f_file, iov, 6) < 0) { 782 int e = errno; 783 (void)close(f->f_file); 784 f->f_type = F_UNUSED; 785 errno = e; 786 logerror(f->f_un.f_fname); 787 } else if (flags & SYNC_FILE) 788 (void)fsync(f->f_file); 789 break; 790 791 case F_PIPE: 792 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 793 v->iov_base = "\n"; 794 v->iov_len = 1; 795 if (f->f_un.f_pipe.f_pid == 0) { 796 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 797 &f->f_un.f_pipe.f_pid)) < 0) { 798 f->f_type = F_UNUSED; 799 logerror(f->f_un.f_pipe.f_pname); 800 break; 801 } 802 } 803 if (writev(f->f_file, iov, 6) < 0) { 804 int e = errno; 805 (void)close(f->f_file); 806 if (f->f_un.f_pipe.f_pid > 0) 807 deadq_enter(f->f_un.f_pipe.f_pid); 808 f->f_un.f_pipe.f_pid = 0; 809 errno = e; 810 logerror(f->f_un.f_pipe.f_pname); 811 } 812 break; 813 814 case F_CONSOLE: 815 if (flags & IGN_CONS) { 816 dprintf(" (ignored)\n"); 817 break; 818 } 819 /* FALLTHROUGH */ 820 821 case F_TTY: 822 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 823 v->iov_base = "\r\n"; 824 v->iov_len = 2; 825 826 errno = 0; /* ttymsg() only sometimes returns an errno */ 827 if ((msgret = ttymsg(iov, 6, f->f_un.f_fname, 10))) { 828 f->f_type = F_UNUSED; 829 logerror(msgret); 830 } 831 break; 832 833 case F_USERS: 834 case F_WALL: 835 dprintf("\n"); 836 v->iov_base = "\r\n"; 837 v->iov_len = 2; 838 wallmsg(f, iov); 839 break; 840 } 841 f->f_prevcount = 0; 842 } 843 844 /* 845 * WALLMSG -- Write a message to the world at large 846 * 847 * Write the specified message to either the entire 848 * world, or a list of approved users. 849 */ 850 void 851 wallmsg(f, iov) 852 struct filed *f; 853 struct iovec *iov; 854 { 855 static int reenter; /* avoid calling ourselves */ 856 FILE *uf; 857 struct utmp ut; 858 int i; 859 char *p; 860 char line[sizeof(ut.ut_line) + 1]; 861 862 if (reenter++) 863 return; 864 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 865 logerror(_PATH_UTMP); 866 reenter = 0; 867 return; 868 } 869 /* NOSTRICT */ 870 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 871 if (ut.ut_name[0] == '\0') 872 continue; 873 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 874 line[sizeof(ut.ut_line)] = '\0'; 875 if (f->f_type == F_WALL) { 876 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) != NULL) { 877 errno = 0; /* already in msg */ 878 logerror(p); 879 } 880 continue; 881 } 882 /* should we send the message to this user? */ 883 for (i = 0; i < MAXUNAMES; i++) { 884 if (!f->f_un.f_uname[i][0]) 885 break; 886 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 887 UT_NAMESIZE)) { 888 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) 889 != NULL) { 890 errno = 0; /* already in msg */ 891 logerror(p); 892 } 893 break; 894 } 895 } 896 } 897 (void)fclose(uf); 898 reenter = 0; 899 } 900 901 void 902 reapchild(signo) 903 int signo; 904 { 905 int status, code; 906 pid_t pid; 907 struct filed *f; 908 char buf[256]; 909 const char *reason; 910 dq_t q; 911 912 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 913 if (!Initialized) 914 /* Don't tell while we are initting. */ 915 continue; 916 917 /* First, look if it's a process from the dead queue. */ 918 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 919 if (q->dq_pid == pid) { 920 TAILQ_REMOVE(&deadq_head, q, dq_entries); 921 free(q); 922 goto oncemore; 923 } 924 925 /* Now, look in list of active processes. */ 926 for (f = Files; f; f = f->f_next) 927 if (f->f_type == F_PIPE && 928 f->f_un.f_pipe.f_pid == pid) { 929 (void)close(f->f_file); 930 931 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 932 f->f_un.f_pipe.f_pid = 0; 933 if (WIFSIGNALED(status)) { 934 reason = "due to signal"; 935 code = WTERMSIG(status); 936 } else { 937 reason = "with status"; 938 code = WEXITSTATUS(status); 939 if (code == 0) 940 goto oncemore; /* Exited OK. */ 941 } 942 (void)snprintf(buf, sizeof buf, 943 "Logging subprocess %d (%s) exited %s %d.", 944 pid, f->f_un.f_pipe.f_pname, 945 reason, code); 946 logerror(buf); 947 break; 948 } 949 oncemore: 950 } 951 } 952 953 /* 954 * Return a printable representation of a host address. 955 */ 956 char * 957 cvthname(f) 958 struct sockaddr_in *f; 959 { 960 struct hostent *hp; 961 char *p; 962 963 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 964 965 if (f->sin_family != AF_INET) { 966 dprintf("Malformed from address\n"); 967 return ("???"); 968 } 969 hp = gethostbyaddr((char *)&f->sin_addr, 970 sizeof(struct in_addr), f->sin_family); 971 if (hp == 0) { 972 dprintf("Host name for your address (%s) unknown\n", 973 inet_ntoa(f->sin_addr)); 974 return (inet_ntoa(f->sin_addr)); 975 } 976 if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 977 *p = '\0'; 978 return (hp->h_name); 979 } 980 981 void 982 domark(signo) 983 int signo; 984 { 985 struct filed *f; 986 dq_t q; 987 988 now = time((time_t *)NULL); 989 MarkSeq += TIMERINTVL; 990 if (MarkSeq >= MarkInterval) { 991 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 992 MarkSeq = 0; 993 } 994 995 for (f = Files; f; f = f->f_next) { 996 if (f->f_prevcount && now >= REPEATTIME(f)) { 997 dprintf("flush %s: repeated %d times, %d sec.\n", 998 TypeNames[f->f_type], f->f_prevcount, 999 repeatinterval[f->f_repeatcount]); 1000 fprintlog(f, 0, (char *)NULL); 1001 BACKOFF(f); 1002 } 1003 } 1004 1005 /* Walk the dead queue, and see if we should signal somebody. */ 1006 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1007 switch (q->dq_timeout) { 1008 case 0: 1009 /* Already signalled once, try harder now. */ 1010 kill(q->dq_pid, SIGKILL); 1011 break; 1012 1013 case 1: 1014 /* 1015 * Timed out on dead queue, send terminate 1016 * signal. Note that we leave the removal 1017 * from the dead queue to reapchild(), which 1018 * will also log the event. 1019 */ 1020 kill(q->dq_pid, SIGTERM); 1021 /* FALLTROUGH */ 1022 1023 default: 1024 q->dq_timeout--; 1025 } 1026 1027 (void)alarm(TIMERINTVL); 1028 } 1029 1030 /* 1031 * Print syslogd errors some place. 1032 */ 1033 void 1034 logerror(type) 1035 const char *type; 1036 { 1037 char buf[512]; 1038 1039 if (errno) 1040 (void)snprintf(buf, 1041 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1042 else 1043 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1044 errno = 0; 1045 dprintf("%s\n", buf); 1046 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1047 } 1048 1049 void 1050 die(signo) 1051 int signo; 1052 { 1053 struct filed *f; 1054 int was_initialized; 1055 char buf[100]; 1056 1057 was_initialized = Initialized; 1058 Initialized = 0; /* Don't log SIGCHLDs. */ 1059 for (f = Files; f != NULL; f = f->f_next) { 1060 /* flush any pending output */ 1061 if (f->f_prevcount) 1062 fprintlog(f, 0, (char *)NULL); 1063 if (f->f_type == F_PIPE) 1064 (void)close(f->f_file); 1065 } 1066 Initialized = was_initialized; 1067 if (signo) { 1068 dprintf("syslogd: exiting on signal %d\n", signo); 1069 (void)sprintf(buf, "exiting on signal %d", signo); 1070 errno = 0; 1071 logerror(buf); 1072 } 1073 if (created_lsock) 1074 (void)unlink(LogName); 1075 exit(1); 1076 } 1077 1078 /* 1079 * INIT -- Initialize syslogd from configuration table 1080 */ 1081 void 1082 init(signo) 1083 int signo; 1084 { 1085 int i; 1086 FILE *cf; 1087 struct filed *f, *next, **nextp; 1088 char *p; 1089 char cline[LINE_MAX]; 1090 char prog[NAME_MAX+1]; 1091 1092 dprintf("init\n"); 1093 1094 /* 1095 * Close all open log files. 1096 */ 1097 Initialized = 0; 1098 for (f = Files; f != NULL; f = next) { 1099 /* flush any pending output */ 1100 if (f->f_prevcount) 1101 fprintlog(f, 0, (char *)NULL); 1102 1103 switch (f->f_type) { 1104 case F_FILE: 1105 case F_FORW: 1106 case F_CONSOLE: 1107 case F_TTY: 1108 (void)close(f->f_file); 1109 break; 1110 case F_PIPE: 1111 (void)close(f->f_file); 1112 if (f->f_un.f_pipe.f_pid > 0) 1113 deadq_enter(f->f_un.f_pipe.f_pid); 1114 f->f_un.f_pipe.f_pid = 0; 1115 break; 1116 } 1117 next = f->f_next; 1118 if(f->f_program) free(f->f_program); 1119 free((char *)f); 1120 } 1121 Files = NULL; 1122 nextp = &Files; 1123 1124 /* open the configuration file */ 1125 if ((cf = fopen(ConfFile, "r")) == NULL) { 1126 dprintf("cannot open %s\n", ConfFile); 1127 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1128 cfline("*.ERR\t/dev/console", *nextp, "*"); 1129 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1130 cfline("*.PANIC\t*", (*nextp)->f_next, "*"); 1131 Initialized = 1; 1132 return; 1133 } 1134 1135 /* 1136 * Foreach line in the conf table, open that file. 1137 */ 1138 f = NULL; 1139 strcpy(prog, "*"); 1140 while (fgets(cline, sizeof(cline), cf) != NULL) { 1141 /* 1142 * check for end-of-section, comments, strip off trailing 1143 * spaces and newline character. #!prog is treated specially: 1144 * following lines apply only to that program. 1145 */ 1146 for (p = cline; isspace(*p); ++p) 1147 continue; 1148 if (*p == 0) 1149 continue; 1150 if(*p == '#') { 1151 p++; 1152 if(*p!='!') 1153 continue; 1154 } 1155 if(*p=='!') { 1156 p++; 1157 while(isspace(*p)) p++; 1158 if(!*p) { 1159 strcpy(prog, "*"); 1160 continue; 1161 } 1162 for(i = 0; i < NAME_MAX; i++) { 1163 if(!isalnum(p[i])) 1164 break; 1165 prog[i] = p[i]; 1166 } 1167 prog[i] = 0; 1168 continue; 1169 } 1170 for (p = strchr(cline, '\0'); isspace(*--p);) 1171 continue; 1172 *++p = '\0'; 1173 f = (struct filed *)calloc(1, sizeof(*f)); 1174 *nextp = f; 1175 nextp = &f->f_next; 1176 cfline(cline, f, prog); 1177 } 1178 1179 /* close the configuration file */ 1180 (void)fclose(cf); 1181 1182 Initialized = 1; 1183 1184 if (Debug) { 1185 for (f = Files; f; f = f->f_next) { 1186 for (i = 0; i <= LOG_NFACILITIES; i++) 1187 if (f->f_pmask[i] == INTERNAL_NOPRI) 1188 printf("X "); 1189 else 1190 printf("%d ", f->f_pmask[i]); 1191 printf("%s: ", TypeNames[f->f_type]); 1192 switch (f->f_type) { 1193 case F_FILE: 1194 printf("%s", f->f_un.f_fname); 1195 break; 1196 1197 case F_CONSOLE: 1198 case F_TTY: 1199 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1200 break; 1201 1202 case F_FORW: 1203 printf("%s", f->f_un.f_forw.f_hname); 1204 break; 1205 1206 case F_PIPE: 1207 printf("%s", f->f_un.f_pipe.f_pname); 1208 break; 1209 1210 case F_USERS: 1211 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1212 printf("%s, ", f->f_un.f_uname[i]); 1213 break; 1214 } 1215 if(f->f_program) { 1216 printf(" (%s)", f->f_program); 1217 } 1218 printf("\n"); 1219 } 1220 } 1221 1222 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1223 dprintf("syslogd: restarted\n"); 1224 } 1225 1226 /* 1227 * Crack a configuration file line 1228 */ 1229 void 1230 cfline(line, f, prog) 1231 char *line; 1232 struct filed *f; 1233 char *prog; 1234 { 1235 struct hostent *hp; 1236 int i, pri; 1237 char *bp, *p, *q; 1238 char buf[MAXLINE], ebuf[100]; 1239 1240 dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog); 1241 1242 errno = 0; /* keep strerror() stuff out of logerror messages */ 1243 1244 /* clear out file entry */ 1245 memset(f, 0, sizeof(*f)); 1246 for (i = 0; i <= LOG_NFACILITIES; i++) 1247 f->f_pmask[i] = INTERNAL_NOPRI; 1248 1249 /* save program name if any */ 1250 if(prog && *prog=='*') prog = NULL; 1251 if(prog) { 1252 f->f_program = calloc(1, strlen(prog)+1); 1253 if(f->f_program) { 1254 strcpy(f->f_program, prog); 1255 } 1256 } 1257 1258 /* scan through the list of selectors */ 1259 for (p = line; *p && *p != '\t';) { 1260 1261 /* find the end of this facility name list */ 1262 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1263 continue; 1264 1265 /* collect priority name */ 1266 for (bp = buf; *q && !strchr("\t,;", *q); ) 1267 *bp++ = *q++; 1268 *bp = '\0'; 1269 1270 /* skip cruft */ 1271 while (strchr(", ;", *q)) 1272 q++; 1273 1274 /* decode priority name */ 1275 if (*buf == '*') 1276 pri = LOG_PRIMASK + 1; 1277 else { 1278 pri = decode(buf, prioritynames); 1279 if (pri < 0) { 1280 (void)snprintf(ebuf, sizeof ebuf, 1281 "unknown priority name \"%s\"", buf); 1282 logerror(ebuf); 1283 return; 1284 } 1285 } 1286 1287 /* scan facilities */ 1288 while (*p && !strchr("\t.;", *p)) { 1289 for (bp = buf; *p && !strchr("\t,;.", *p); ) 1290 *bp++ = *p++; 1291 *bp = '\0'; 1292 if (*buf == '*') 1293 for (i = 0; i < LOG_NFACILITIES; i++) 1294 f->f_pmask[i] = pri; 1295 else { 1296 i = decode(buf, facilitynames); 1297 if (i < 0) { 1298 (void)snprintf(ebuf, sizeof ebuf, 1299 "unknown facility name \"%s\"", 1300 buf); 1301 logerror(ebuf); 1302 return; 1303 } 1304 f->f_pmask[i >> 3] = pri; 1305 } 1306 while (*p == ',' || *p == ' ') 1307 p++; 1308 } 1309 1310 p = q; 1311 } 1312 1313 /* skip to action part */ 1314 while (*p == '\t') 1315 p++; 1316 1317 switch (*p) 1318 { 1319 case '@': 1320 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1321 hp = gethostbyname(p); 1322 if (hp == NULL) { 1323 extern int h_errno; 1324 1325 logerror(hstrerror(h_errno)); 1326 break; 1327 } 1328 memset(&f->f_un.f_forw.f_addr, 0, 1329 sizeof(f->f_un.f_forw.f_addr)); 1330 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1331 f->f_un.f_forw.f_addr.sin_port = LogPort; 1332 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1333 f->f_type = F_FORW; 1334 break; 1335 1336 case '/': 1337 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1338 f->f_type = F_UNUSED; 1339 logerror(p); 1340 break; 1341 } 1342 if (isatty(f->f_file)) { 1343 if (strcmp(p, ctty) == 0) 1344 f->f_type = F_CONSOLE; 1345 else 1346 f->f_type = F_TTY; 1347 (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); 1348 } else { 1349 (void)strcpy(f->f_un.f_fname, p); 1350 f->f_type = F_FILE; 1351 } 1352 break; 1353 1354 case '|': 1355 f->f_un.f_pipe.f_pid = 0; 1356 (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); 1357 f->f_type = F_PIPE; 1358 break; 1359 1360 case '*': 1361 f->f_type = F_WALL; 1362 break; 1363 1364 default: 1365 for (i = 0; i < MAXUNAMES && *p; i++) { 1366 for (q = p; *q && *q != ','; ) 1367 q++; 1368 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1369 if ((q - p) > UT_NAMESIZE) 1370 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1371 else 1372 f->f_un.f_uname[i][q - p] = '\0'; 1373 while (*q == ',' || *q == ' ') 1374 q++; 1375 p = q; 1376 } 1377 f->f_type = F_USERS; 1378 break; 1379 } 1380 } 1381 1382 1383 /* 1384 * Decode a symbolic name to a numeric value 1385 */ 1386 int 1387 decode(name, codetab) 1388 const char *name; 1389 CODE *codetab; 1390 { 1391 CODE *c; 1392 char *p, buf[40]; 1393 1394 if (isdigit(*name)) 1395 return (atoi(name)); 1396 1397 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1398 if (isupper(*name)) 1399 *p = tolower(*name); 1400 else 1401 *p = *name; 1402 } 1403 *p = '\0'; 1404 for (c = codetab; c->c_name; c++) 1405 if (!strcmp(buf, c->c_name)) 1406 return (c->c_val); 1407 1408 return (-1); 1409 } 1410 1411 /* 1412 * fork off and become a daemon, but wait for the child to come online 1413 * before returing to the parent, or we get disk thrashing at boot etc. 1414 * Set a timer so we don't hang forever if it wedges. 1415 */ 1416 int 1417 waitdaemon(nochdir, noclose, maxwait) 1418 int nochdir, noclose, maxwait; 1419 { 1420 int fd; 1421 int status; 1422 pid_t pid, childpid; 1423 1424 switch (childpid = fork()) { 1425 case -1: 1426 return (-1); 1427 case 0: 1428 break; 1429 default: 1430 signal(SIGALRM, timedout); 1431 alarm(maxwait); 1432 while ((pid = wait3(&status, 0, NULL)) != -1) { 1433 if (WIFEXITED(status)) 1434 errx(1, "child pid %d exited with return code %d", 1435 pid, WEXITSTATUS(status)); 1436 if (WIFSIGNALED(status)) 1437 errx(1, "child pid %d exited on signal %d%s", 1438 pid, WTERMSIG(status), 1439 WCOREDUMP(status) ? " (core dumped)" : 1440 ""); 1441 if (pid == childpid) /* it's gone... */ 1442 break; 1443 } 1444 exit(0); 1445 } 1446 1447 if (setsid() == -1) 1448 return (-1); 1449 1450 if (!nochdir) 1451 (void)chdir("/"); 1452 1453 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1454 (void)dup2(fd, STDIN_FILENO); 1455 (void)dup2(fd, STDOUT_FILENO); 1456 (void)dup2(fd, STDERR_FILENO); 1457 if (fd > 2) 1458 (void)close (fd); 1459 } 1460 return (getppid()); 1461 } 1462 1463 /* 1464 * We get a SIGALRM from the child when it's running and finished doing it's 1465 * fsync()'s or O_SYNC writes for all the boot messages. 1466 * 1467 * We also get a signal from the kernel if the timer expires, so check to 1468 * see what happened. 1469 */ 1470 void 1471 timedout(sig) 1472 int sig __unused; 1473 { 1474 int left; 1475 left = alarm(0); 1476 signal(SIGALRM, SIG_DFL); 1477 if (left == 0) 1478 errx(1, "timed out waiting for child"); 1479 else 1480 exit(0); 1481 } 1482 1483 /* 1484 * Add `s' to the list of allowable peer addresses to accept messages 1485 * from. 1486 * 1487 * `s' is a string in the form: 1488 * 1489 * [*]domainname[:{servicename|portnumber|*}] 1490 * 1491 * or 1492 * 1493 * netaddr/maskbits[:{servicename|portnumber|*}] 1494 * 1495 * Returns -1 on error, 0 if the argument was valid. 1496 */ 1497 int 1498 allowaddr(s) 1499 char *s; 1500 { 1501 char *cp1, *cp2; 1502 struct allowedpeer ap; 1503 struct servent *se; 1504 regex_t re; 1505 int i; 1506 1507 if ((cp1 = strrchr(s, ':'))) { 1508 /* service/port provided */ 1509 *cp1++ = '\0'; 1510 if (strlen(cp1) == 1 && *cp1 == '*') 1511 /* any port allowed */ 1512 ap.port = htons(0); 1513 else if ((se = getservbyname(cp1, "udp"))) 1514 ap.port = se->s_port; 1515 else { 1516 ap.port = htons((int)strtol(cp1, &cp2, 0)); 1517 if (*cp2 != '\0') 1518 return -1; /* port not numeric */ 1519 } 1520 } else { 1521 if ((se = getservbyname("syslog", "udp"))) 1522 ap.port = se->s_port; 1523 else 1524 /* sanity, should not happen */ 1525 ap.port = htons(514); 1526 } 1527 1528 /* the regexp's are ugly, but the cleanest way */ 1529 1530 if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$", 1531 REG_EXTENDED)) 1532 /* if RE compilation fails, that's an internal error */ 1533 abort(); 1534 if (regexec(&re, s, 0, 0, 0) == 0) { 1535 /* arg `s' is numeric */ 1536 ap.isnumeric = 1; 1537 if ((cp1 = strchr(s, '/')) != NULL) { 1538 *cp1++ = '\0'; 1539 i = atoi(cp1); 1540 if (i < 0 || i > 32) 1541 return -1; 1542 /* convert masklen to netmask */ 1543 ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1)); 1544 } 1545 if (ascii2addr(AF_INET, s, &ap.a_addr) == -1) 1546 return -1; 1547 if (cp1 == NULL) { 1548 /* use default netmask */ 1549 if (IN_CLASSA(ntohl(ap.a_addr.s_addr))) 1550 ap.a_mask.s_addr = htonl(IN_CLASSA_NET); 1551 else if (IN_CLASSB(ntohl(ap.a_addr.s_addr))) 1552 ap.a_mask.s_addr = htonl(IN_CLASSB_NET); 1553 else 1554 ap.a_mask.s_addr = htonl(IN_CLASSC_NET); 1555 } 1556 } else { 1557 /* arg `s' is domain name */ 1558 ap.isnumeric = 0; 1559 ap.a_name = s; 1560 } 1561 regfree(&re); 1562 1563 if (Debug) { 1564 printf("allowaddr: rule %d: ", NumAllowed); 1565 if (ap.isnumeric) { 1566 printf("numeric, "); 1567 printf("addr = %s, ", 1568 addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0)); 1569 printf("mask = %s; ", 1570 addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0)); 1571 } else 1572 printf("domainname = %s; ", ap.a_name); 1573 printf("port = %d\n", ntohs(ap.port)); 1574 } 1575 1576 if ((AllowedPeers = realloc(AllowedPeers, 1577 ++NumAllowed * sizeof(struct allowedpeer))) 1578 == NULL) { 1579 fprintf(stderr, "Out of memory!\n"); 1580 exit(EX_OSERR); 1581 } 1582 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 1583 return 0; 1584 } 1585 1586 /* 1587 * Validate that the remote peer has permission to log to us. 1588 */ 1589 int 1590 validate(sin, hname) 1591 struct sockaddr_in *sin; 1592 const char *hname; 1593 { 1594 int i; 1595 size_t l1, l2; 1596 char *cp, name[MAXHOSTNAMELEN]; 1597 struct allowedpeer *ap; 1598 1599 if (NumAllowed == 0) 1600 /* traditional behaviour, allow everything */ 1601 return 1; 1602 1603 strncpy(name, hname, sizeof name); 1604 if (strchr(name, '.') == NULL) { 1605 strncat(name, ".", sizeof name - strlen(name) - 1); 1606 strncat(name, LocalDomain, sizeof name - strlen(name) - 1); 1607 } 1608 dprintf("validate: dgram from IP %s, port %d, name %s;\n", 1609 addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0), 1610 ntohs(sin->sin_port), name); 1611 1612 /* now, walk down the list */ 1613 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 1614 if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) { 1615 dprintf("rejected in rule %d due to port mismatch.\n", i); 1616 continue; 1617 } 1618 1619 if (ap->isnumeric) { 1620 if ((sin->sin_addr.s_addr & ap->a_mask.s_addr) 1621 != ap->a_addr.s_addr) { 1622 dprintf("rejected in rule %d due to IP mismatch.\n", i); 1623 continue; 1624 } 1625 } else { 1626 cp = ap->a_name; 1627 l1 = strlen(name); 1628 if (*cp == '*') { 1629 /* allow wildmatch */ 1630 cp++; 1631 l2 = strlen(cp); 1632 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 1633 dprintf("rejected in rule %d due to name mismatch.\n", i); 1634 continue; 1635 } 1636 } else { 1637 /* exact match */ 1638 l2 = strlen(cp); 1639 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 1640 dprintf("rejected in rule %d due to name mismatch.\n", i); 1641 continue; 1642 } 1643 } 1644 } 1645 dprintf("accepted in rule %d.\n", i); 1646 return 1; /* hooray! */ 1647 } 1648 return 0; 1649 } 1650 1651 /* 1652 * Fairly similar to popen(3), but returns an open descriptor, as 1653 * opposed to a FILE *. 1654 */ 1655 int 1656 p_open(prog, pid) 1657 char *prog; 1658 pid_t *pid; 1659 { 1660 int pfd[2], nulldesc, i; 1661 sigset_t omask, mask; 1662 char *argv[4]; /* sh -c cmd NULL */ 1663 char errmsg[200]; 1664 1665 if (pipe(pfd) == -1) 1666 return -1; 1667 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 1668 /* we are royally screwed anyway */ 1669 return -1; 1670 1671 mask = sigmask(SIGALRM) | sigmask(SIGHUP); 1672 sigprocmask(SIG_BLOCK, &omask, &mask); 1673 switch ((*pid = fork())) { 1674 case -1: 1675 sigprocmask(SIG_SETMASK, 0, &omask); 1676 close(nulldesc); 1677 return -1; 1678 1679 case 0: 1680 argv[0] = "sh"; 1681 argv[1] = "-c"; 1682 argv[2] = prog; 1683 argv[3] = NULL; 1684 1685 alarm(0); 1686 (void)setsid(); /* Avoid catching SIGHUPs. */ 1687 1688 /* 1689 * Throw away pending signals, and reset signal 1690 * behaviour to standard values. 1691 */ 1692 signal(SIGALRM, SIG_IGN); 1693 signal(SIGHUP, SIG_IGN); 1694 sigprocmask(SIG_SETMASK, 0, &omask); 1695 signal(SIGPIPE, SIG_DFL); 1696 signal(SIGQUIT, SIG_DFL); 1697 signal(SIGALRM, SIG_DFL); 1698 signal(SIGHUP, SIG_DFL); 1699 1700 dup2(pfd[0], STDIN_FILENO); 1701 dup2(nulldesc, STDOUT_FILENO); 1702 dup2(nulldesc, STDERR_FILENO); 1703 for (i = getdtablesize(); i > 2; i--) 1704 (void) close(i); 1705 1706 (void) execvp(_PATH_BSHELL, argv); 1707 _exit(255); 1708 } 1709 1710 sigprocmask(SIG_SETMASK, 0, &omask); 1711 close(nulldesc); 1712 close(pfd[0]); 1713 /* 1714 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 1715 * supposed to get an EWOULDBLOCK on writev(2), which is 1716 * caught by the logic above anyway, which will in turn close 1717 * the pipe, and fork a new logging subprocess if necessary. 1718 * The stale subprocess will be killed some time later unless 1719 * it terminated itself due to closing its input pipe (so we 1720 * get rid of really dead puppies). 1721 */ 1722 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 1723 /* This is bad. */ 1724 (void)snprintf(errmsg, sizeof errmsg, 1725 "Warning: cannot change pipe to PID %d to " 1726 "non-blocking behaviour.", 1727 (int)*pid); 1728 logerror(errmsg); 1729 } 1730 return pfd[1]; 1731 } 1732 1733 void 1734 deadq_enter(pid) 1735 pid_t pid; 1736 { 1737 dq_t p; 1738 1739 p = malloc(sizeof(struct deadq_entry)); 1740 if (p == 0) { 1741 errno = 0; 1742 logerror("panic: out of virtual memory!"); 1743 exit(1); 1744 } 1745 1746 p->dq_pid = pid; 1747 p->dq_timeout = DQ_TIMO_INIT; 1748 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 1749 } 1750