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 1.20 1997/02/22 16:14:00 peter 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 <setjmp.h> 98 #include <signal.h> 99 #include <stdio.h> 100 #include <stdlib.h> 101 #include <string.h> 102 #include <unistd.h> 103 #include <utmp.h> 104 #include "pathnames.h" 105 106 #define SYSLOG_NAMES 107 #include <sys/syslog.h> 108 109 const char *LogName = _PATH_LOG; 110 const char *ConfFile = _PATH_LOGCONF; 111 const char *PidFile = _PATH_LOGPID; 112 const char ctty[] = _PATH_CONSOLE; 113 114 #define FDMASK(fd) (1 << (fd)) 115 116 #define dprintf if (Debug) printf 117 118 #define MAXUNAMES 20 /* maximum number of user names */ 119 120 /* 121 * Flags to logmsg(). 122 */ 123 124 #define IGN_CONS 0x001 /* don't print on console */ 125 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 126 #define ADDDATE 0x004 /* add a date to the message */ 127 #define MARK 0x008 /* this message is a mark */ 128 129 /* 130 * This structure represents the files that will have log 131 * copies printed. 132 */ 133 134 struct filed { 135 struct filed *f_next; /* next in linked list */ 136 short f_type; /* entry type, see below */ 137 short f_file; /* file descriptor */ 138 time_t f_time; /* time this was last written */ 139 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 140 char *f_program; /* program this applies to */ 141 union { 142 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 143 struct { 144 char f_hname[MAXHOSTNAMELEN+1]; 145 struct sockaddr_in f_addr; 146 } f_forw; /* forwarding address */ 147 char f_fname[MAXPATHLEN]; 148 struct { 149 char f_pname[MAXPATHLEN]; 150 pid_t f_pid; 151 } f_pipe; 152 } f_un; 153 char f_prevline[MAXSVLINE]; /* last message logged */ 154 char f_lasttime[16]; /* time of last occurrence */ 155 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 156 int f_prevpri; /* pri of f_prevline */ 157 int f_prevlen; /* length of f_prevline */ 158 int f_prevcount; /* repetition cnt of prevline */ 159 int f_repeatcount; /* number of "repeated" msgs */ 160 }; 161 162 /* 163 * Queue of about-to-be dead processes we should watch out for. 164 */ 165 166 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 167 struct stailhead *deadq_headp; 168 169 struct deadq_entry { 170 pid_t dq_pid; 171 int dq_timeout; 172 TAILQ_ENTRY(deadq_entry) dq_entries; 173 }; 174 175 /* 176 * The timeout to apply to processes waiting on the dead queue. Unit 177 * of measure is `mark intervals', i.e. 20 minutes by default. 178 * Processes on the dead queue will be terminated after that time. 179 */ 180 181 #define DQ_TIMO_INIT 2 182 183 typedef struct deadq_entry *dq_t; 184 185 186 /* 187 * Intervals at which we flush out "message repeated" messages, 188 * in seconds after previous message is logged. After each flush, 189 * we move to the next interval until we reach the largest. 190 */ 191 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 192 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 193 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 194 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 195 (f)->f_repeatcount = MAXREPEAT; \ 196 } 197 198 /* values for f_type */ 199 #define F_UNUSED 0 /* unused entry */ 200 #define F_FILE 1 /* regular file */ 201 #define F_TTY 2 /* terminal */ 202 #define F_CONSOLE 3 /* console terminal */ 203 #define F_FORW 4 /* remote machine */ 204 #define F_USERS 5 /* list of users */ 205 #define F_WALL 6 /* everyone logged on */ 206 #define F_PIPE 7 /* pipe to program */ 207 208 char *TypeNames[8] = { 209 "UNUSED", "FILE", "TTY", "CONSOLE", 210 "FORW", "USERS", "WALL", "PIPE" 211 }; 212 213 struct filed *Files; 214 struct filed consfile; 215 216 int Debug; /* debug flag */ 217 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 218 char *LocalDomain; /* our local domain name */ 219 int InetInuse = 0; /* non-zero if INET sockets are being used */ 220 int finet; /* Internet datagram socket */ 221 int LogPort; /* port number for INET connections */ 222 int Initialized = 0; /* set when we have initialized ourselves */ 223 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 224 int MarkSeq = 0; /* mark sequence number */ 225 int SecureMode = 0; /* when true, speak only unix domain socks */ 226 227 int created_lsock = 0; /* Flag if local socket created */ 228 char bootfile[MAXLINE+1]; /* booted kernel file */ 229 230 void cfline __P((char *, struct filed *, char *)); 231 char *cvthname __P((struct sockaddr_in *)); 232 void deadq_enter __P((pid_t)); 233 int decode __P((const char *, CODE *)); 234 void die __P((int)); 235 void domark __P((int)); 236 void fprintlog __P((struct filed *, int, char *)); 237 void init __P((int)); 238 void logerror __P((const char *)); 239 void logmsg __P((int, char *, char *, int)); 240 void printline __P((char *, char *)); 241 void printsys __P((char *)); 242 int p_open __P((char *, pid_t *)); 243 void reapchild __P((int)); 244 char *ttymsg __P((struct iovec *, int, char *, int)); 245 void usage __P((void)); 246 void wallmsg __P((struct filed *, struct iovec *)); 247 int waitdaemon __P((int, int, int)); 248 void timedout __P((int)); 249 250 int 251 main(argc, argv) 252 int argc; 253 char *argv[]; 254 { 255 int ch, funix, i, inetm, fklog, klogm, len; 256 struct sockaddr_un sunx, fromunix; 257 struct sockaddr_in sin, frominet; 258 FILE *fp; 259 char *p, line[MSG_BSIZE + 1]; 260 struct timeval tv, *tvp; 261 pid_t ppid; 262 263 while ((ch = getopt(argc, argv, "dsf:Im:p:")) != EOF) 264 switch(ch) { 265 case 'd': /* debug */ 266 Debug++; 267 break; 268 case 'f': /* configuration file */ 269 ConfFile = optarg; 270 break; 271 case 'm': /* mark interval */ 272 MarkInterval = atoi(optarg) * 60; 273 break; 274 case 'p': /* path */ 275 LogName = optarg; 276 break; 277 case 'I': /* backwards compatible w/FreeBSD */ 278 case 's': /* no network mode */ 279 SecureMode++; 280 break; 281 case '?': 282 default: 283 usage(); 284 } 285 if ((argc -= optind) != 0) 286 usage(); 287 288 if (!Debug) { 289 ppid = waitdaemon(0, 0, 30); 290 if (ppid < 0) 291 err(1, "could not become daemon"); 292 } else 293 setlinebuf(stdout); 294 295 consfile.f_type = F_CONSOLE; 296 (void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1); 297 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 298 if ((p = strchr(LocalHostName, '.')) != NULL) { 299 *p++ = '\0'; 300 LocalDomain = p; 301 } else 302 LocalDomain = ""; 303 (void)strcpy(bootfile, getbootfile()); 304 (void)signal(SIGTERM, die); 305 (void)signal(SIGINT, Debug ? die : SIG_IGN); 306 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 307 (void)signal(SIGCHLD, reapchild); 308 (void)signal(SIGALRM, domark); 309 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 310 (void)alarm(TIMERINTVL); 311 312 #ifndef SUN_LEN 313 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 314 #endif 315 memset(&sunx, 0, sizeof(sunx)); 316 sunx.sun_family = AF_UNIX; 317 (void)strncpy(sunx.sun_path, LogName, sizeof(sunx.sun_path)); 318 (void)unlink(LogName); 319 funix = socket(AF_UNIX, SOCK_DGRAM, 0); 320 if (funix < 0 || 321 bind(funix, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 322 chmod(LogName, 0666) < 0) { 323 (void) sprintf(line, "cannot create %s", LogName); 324 logerror(line); 325 dprintf("cannot create %s (%d)\n", LogName, errno); 326 die(0); 327 } else 328 created_lsock = 1; 329 330 if (!SecureMode) 331 finet = socket(AF_INET, SOCK_DGRAM, 0); 332 else 333 finet = -1; 334 335 TAILQ_INIT(&deadq_head); 336 337 inetm = 0; 338 if (finet >= 0) { 339 struct servent *sp; 340 341 sp = getservbyname("syslog", "udp"); 342 if (sp == NULL) { 343 errno = 0; 344 logerror("syslog/udp: unknown service"); 345 die(0); 346 } 347 memset(&sin, 0, sizeof(sin)); 348 sin.sin_family = AF_INET; 349 sin.sin_port = LogPort = sp->s_port; 350 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 351 logerror("bind"); 352 if (!Debug) 353 die(0); 354 } else { 355 inetm = FDMASK(finet); 356 InetInuse = 1; 357 } 358 } 359 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 360 klogm = FDMASK(fklog); 361 else { 362 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 363 klogm = 0; 364 } 365 366 /* tuck my process id away */ 367 fp = fopen(PidFile, "w"); 368 if (fp != NULL) { 369 fprintf(fp, "%d\n", getpid()); 370 (void) fclose(fp); 371 } 372 373 dprintf("off & running....\n"); 374 375 init(0); 376 (void)signal(SIGHUP, init); 377 378 tvp = &tv; 379 tv.tv_sec = tv.tv_usec = 0; 380 381 for (;;) { 382 int nfds, readfds = FDMASK(funix) | inetm | klogm; 383 384 dprintf("readfds = %#x\n", readfds); 385 nfds = select(20, (fd_set *)&readfds, (fd_set *)NULL, 386 (fd_set *)NULL, tvp); 387 if (nfds == 0) { 388 if (tvp) { 389 tvp = NULL; 390 if (ppid != 1) 391 kill(ppid, SIGALRM); 392 } 393 continue; 394 } 395 if (nfds < 0) { 396 if (errno != EINTR) 397 logerror("select"); 398 continue; 399 } 400 dprintf("got a message (%d, %#x)\n", nfds, readfds); 401 if (readfds & klogm) { 402 i = read(fklog, line, sizeof(line) - 1); 403 if (i > 0) { 404 line[i] = '\0'; 405 printsys(line); 406 } else if (i < 0 && errno != EINTR) { 407 logerror("klog"); 408 fklog = -1; 409 klogm = 0; 410 } 411 } 412 if (readfds & FDMASK(funix)) { 413 len = sizeof(fromunix); 414 i = recvfrom(funix, line, MAXLINE, 0, 415 (struct sockaddr *)&fromunix, &len); 416 if (i > 0) { 417 line[i] = '\0'; 418 printline(LocalHostName, line); 419 } else if (i < 0 && errno != EINTR) 420 logerror("recvfrom unix"); 421 } 422 if (readfds & inetm) { 423 len = sizeof(frominet); 424 i = recvfrom(finet, line, MAXLINE, 0, 425 (struct sockaddr *)&frominet, &len); 426 if (i > 0) { 427 line[i] = '\0'; 428 printline(cvthname(&frominet), line); 429 } else if (i < 0 && errno != EINTR) 430 logerror("recvfrom inet"); 431 } 432 } 433 } 434 435 void 436 usage() 437 { 438 439 fprintf(stderr, 440 "usage: syslogd [-ds] [-f conffile] [-m markinterval]" 441 " [-p logpath]\n"); 442 exit(1); 443 } 444 445 /* 446 * Take a raw input line, decode the message, and print the message 447 * on the appropriate log files. 448 */ 449 void 450 printline(hname, msg) 451 char *hname; 452 char *msg; 453 { 454 int c, pri; 455 char *p, *q, line[MAXLINE + 1]; 456 457 /* test for special codes */ 458 pri = DEFUPRI; 459 p = msg; 460 if (*p == '<') { 461 pri = 0; 462 while (isdigit(*++p)) 463 pri = 10 * pri + (*p - '0'); 464 if (*p == '>') 465 ++p; 466 } 467 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 468 pri = DEFUPRI; 469 470 /* don't allow users to log kernel messages */ 471 if (LOG_FAC(pri) == LOG_KERN) 472 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 473 474 q = line; 475 476 while ((c = *p++ & 0177) != '\0' && 477 q < &line[sizeof(line) - 1]) 478 if (iscntrl(c)) 479 if (c == '\n') 480 *q++ = ' '; 481 else if (c == '\t') 482 *q++ = '\t'; 483 else { 484 *q++ = '^'; 485 *q++ = c ^ 0100; 486 } 487 else 488 *q++ = c; 489 *q = '\0'; 490 491 logmsg(pri, line, hname, 0); 492 } 493 494 /* 495 * Take a raw input line from /dev/klog, split and format similar to syslog(). 496 */ 497 void 498 printsys(msg) 499 char *msg; 500 { 501 int c, pri, flags; 502 char *lp, *p, *q, line[MAXLINE + 1]; 503 504 (void)strcpy(line, bootfile); 505 (void)strcat(line, ": "); 506 lp = line + strlen(line); 507 for (p = msg; *p != '\0'; ) { 508 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 509 pri = DEFSPRI; 510 if (*p == '<') { 511 pri = 0; 512 while (isdigit(*++p)) 513 pri = 10 * pri + (*p - '0'); 514 if (*p == '>') 515 ++p; 516 } else { 517 /* kernel printf's come out on console */ 518 flags |= IGN_CONS; 519 } 520 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 521 pri = DEFSPRI; 522 q = lp; 523 while (*p != '\0' && (c = *p++) != '\n' && 524 q < &line[MAXLINE]) 525 *q++ = c; 526 *q = '\0'; 527 logmsg(pri, line, LocalHostName, flags); 528 } 529 } 530 531 time_t now; 532 533 /* 534 * Log a message to the appropriate log files, users, etc. based on 535 * the priority. 536 */ 537 void 538 logmsg(pri, msg, from, flags) 539 int pri; 540 char *msg, *from; 541 int flags; 542 { 543 struct filed *f; 544 int fac, msglen, omask, prilev; 545 char *timestamp; 546 char prog[NAME_MAX+1]; 547 int i; 548 549 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 550 pri, flags, from, msg); 551 552 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 553 554 /* 555 * Check to see if msg looks non-standard. 556 */ 557 msglen = strlen(msg); 558 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 559 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 560 flags |= ADDDATE; 561 562 (void)time(&now); 563 if (flags & ADDDATE) 564 timestamp = ctime(&now) + 4; 565 else { 566 timestamp = msg; 567 msg += 16; 568 msglen -= 16; 569 } 570 571 /* skip leading blanks */ 572 while(isspace(*msg)) { 573 msg++; 574 msglen--; 575 } 576 577 /* extract facility and priority level */ 578 if (flags & MARK) 579 fac = LOG_NFACILITIES; 580 else 581 fac = LOG_FAC(pri); 582 prilev = LOG_PRI(pri); 583 584 /* extract program name */ 585 for(i = 0; i < NAME_MAX; i++) { 586 if(!isalnum(msg[i])) 587 break; 588 prog[i] = msg[i]; 589 } 590 prog[i] = 0; 591 592 /* log the message to the particular outputs */ 593 if (!Initialized) { 594 f = &consfile; 595 f->f_file = open(ctty, O_WRONLY, 0); 596 597 if (f->f_file >= 0) { 598 fprintlog(f, flags, msg); 599 (void)close(f->f_file); 600 } 601 (void)sigsetmask(omask); 602 return; 603 } 604 for (f = Files; f; f = f->f_next) { 605 /* skip messages that are incorrect priority */ 606 if (f->f_pmask[fac] < prilev || 607 f->f_pmask[fac] == INTERNAL_NOPRI) 608 continue; 609 /* skip messages with the incorrect program name */ 610 if(f->f_program) 611 if(strcmp(prog, f->f_program) != 0) 612 continue; 613 614 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 615 continue; 616 617 /* don't output marks to recently written files */ 618 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 619 continue; 620 621 /* 622 * suppress duplicate lines to this file 623 */ 624 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 625 !strcmp(msg, f->f_prevline) && 626 !strcmp(from, f->f_prevhost)) { 627 (void)strncpy(f->f_lasttime, timestamp, 15); 628 f->f_prevcount++; 629 dprintf("msg repeated %d times, %ld sec of %d\n", 630 f->f_prevcount, now - f->f_time, 631 repeatinterval[f->f_repeatcount]); 632 /* 633 * If domark would have logged this by now, 634 * flush it now (so we don't hold isolated messages), 635 * but back off so we'll flush less often 636 * in the future. 637 */ 638 if (now > REPEATTIME(f)) { 639 fprintlog(f, flags, (char *)NULL); 640 BACKOFF(f); 641 } 642 } else { 643 /* new line, save it */ 644 if (f->f_prevcount) 645 fprintlog(f, 0, (char *)NULL); 646 f->f_repeatcount = 0; 647 f->f_prevpri = pri; 648 (void)strncpy(f->f_lasttime, timestamp, 15); 649 (void)strncpy(f->f_prevhost, from, 650 sizeof(f->f_prevhost)); 651 if (msglen < MAXSVLINE) { 652 f->f_prevlen = msglen; 653 (void)strcpy(f->f_prevline, msg); 654 fprintlog(f, flags, (char *)NULL); 655 } else { 656 f->f_prevline[0] = 0; 657 f->f_prevlen = 0; 658 fprintlog(f, flags, msg); 659 } 660 } 661 } 662 (void)sigsetmask(omask); 663 } 664 665 void 666 fprintlog(f, flags, msg) 667 struct filed *f; 668 int flags; 669 char *msg; 670 { 671 struct iovec iov[6]; 672 struct iovec *v; 673 int l; 674 char line[MAXLINE + 1], repbuf[80], greetings[200]; 675 char *msgret; 676 dq_t q; 677 678 v = iov; 679 if (f->f_type == F_WALL) { 680 v->iov_base = greetings; 681 v->iov_len = sprintf(greetings, 682 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 683 f->f_prevhost, ctime(&now)); 684 v++; 685 v->iov_base = ""; 686 v->iov_len = 0; 687 v++; 688 } else { 689 v->iov_base = f->f_lasttime; 690 v->iov_len = 15; 691 v++; 692 v->iov_base = " "; 693 v->iov_len = 1; 694 v++; 695 } 696 v->iov_base = f->f_prevhost; 697 v->iov_len = strlen(v->iov_base); 698 v++; 699 v->iov_base = " "; 700 v->iov_len = 1; 701 v++; 702 703 if (msg) { 704 v->iov_base = msg; 705 v->iov_len = strlen(msg); 706 } else if (f->f_prevcount > 1) { 707 v->iov_base = repbuf; 708 v->iov_len = sprintf(repbuf, "last message repeated %d times", 709 f->f_prevcount); 710 } else { 711 v->iov_base = f->f_prevline; 712 v->iov_len = f->f_prevlen; 713 } 714 v++; 715 716 dprintf("Logging to %s", TypeNames[f->f_type]); 717 f->f_time = now; 718 719 switch (f->f_type) { 720 case F_UNUSED: 721 dprintf("\n"); 722 break; 723 724 case F_FORW: 725 dprintf(" %s\n", f->f_un.f_forw.f_hname); 726 l = sprintf(line, "<%d>%.15s %s", f->f_prevpri, 727 iov[0].iov_base, iov[4].iov_base); 728 if (l > MAXLINE) 729 l = MAXLINE; 730 if ((finet >= 0) && 731 (sendto(finet, line, l, 0, 732 (struct sockaddr *)&f->f_un.f_forw.f_addr, 733 sizeof(f->f_un.f_forw.f_addr)) != l)) { 734 int e = errno; 735 (void)close(f->f_file); 736 f->f_type = F_UNUSED; 737 errno = e; 738 logerror("sendto"); 739 } 740 break; 741 742 case F_FILE: 743 dprintf(" %s\n", f->f_un.f_fname); 744 v->iov_base = "\n"; 745 v->iov_len = 1; 746 if (writev(f->f_file, iov, 6) < 0) { 747 int e = errno; 748 (void)close(f->f_file); 749 f->f_type = F_UNUSED; 750 errno = e; 751 logerror(f->f_un.f_fname); 752 } else if (flags & SYNC_FILE) 753 (void)fsync(f->f_file); 754 break; 755 756 case F_PIPE: 757 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 758 v->iov_base = "\n"; 759 v->iov_len = 1; 760 if (f->f_un.f_pipe.f_pid == 0) { 761 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 762 &f->f_un.f_pipe.f_pid)) < 0) { 763 f->f_type = F_UNUSED; 764 logerror(f->f_un.f_pipe.f_pname); 765 break; 766 } 767 } 768 if (writev(f->f_file, iov, 6) < 0) { 769 int e = errno; 770 (void)close(f->f_file); 771 if (f->f_un.f_pipe.f_pid > 0) 772 deadq_enter(f->f_un.f_pipe.f_pid); 773 f->f_un.f_pipe.f_pid = 0; 774 errno = e; 775 logerror(f->f_un.f_pipe.f_pname); 776 } 777 break; 778 779 case F_CONSOLE: 780 if (flags & IGN_CONS) { 781 dprintf(" (ignored)\n"); 782 break; 783 } 784 /* FALLTHROUGH */ 785 786 case F_TTY: 787 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 788 v->iov_base = "\r\n"; 789 v->iov_len = 2; 790 791 errno = 0; /* ttymsg() only sometimes returns an errno */ 792 if ((msgret = ttymsg(iov, 6, f->f_un.f_fname, 10))) { 793 f->f_type = F_UNUSED; 794 logerror(msgret); 795 } 796 break; 797 798 case F_USERS: 799 case F_WALL: 800 dprintf("\n"); 801 v->iov_base = "\r\n"; 802 v->iov_len = 2; 803 wallmsg(f, iov); 804 break; 805 } 806 f->f_prevcount = 0; 807 } 808 809 /* 810 * WALLMSG -- Write a message to the world at large 811 * 812 * Write the specified message to either the entire 813 * world, or a list of approved users. 814 */ 815 void 816 wallmsg(f, iov) 817 struct filed *f; 818 struct iovec *iov; 819 { 820 static int reenter; /* avoid calling ourselves */ 821 FILE *uf; 822 struct utmp ut; 823 int i; 824 char *p; 825 char line[sizeof(ut.ut_line) + 1]; 826 827 if (reenter++) 828 return; 829 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 830 logerror(_PATH_UTMP); 831 reenter = 0; 832 return; 833 } 834 /* NOSTRICT */ 835 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 836 if (ut.ut_name[0] == '\0') 837 continue; 838 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 839 line[sizeof(ut.ut_line)] = '\0'; 840 if (f->f_type == F_WALL) { 841 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) != NULL) { 842 errno = 0; /* already in msg */ 843 logerror(p); 844 } 845 continue; 846 } 847 /* should we send the message to this user? */ 848 for (i = 0; i < MAXUNAMES; i++) { 849 if (!f->f_un.f_uname[i][0]) 850 break; 851 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 852 UT_NAMESIZE)) { 853 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) 854 != NULL) { 855 errno = 0; /* already in msg */ 856 logerror(p); 857 } 858 break; 859 } 860 } 861 } 862 (void)fclose(uf); 863 reenter = 0; 864 } 865 866 void 867 reapchild(signo) 868 int signo; 869 { 870 int status, code; 871 pid_t pid; 872 struct filed *f; 873 char buf[256]; 874 const char *reason; 875 dq_t q; 876 877 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 878 if (!Initialized) 879 /* Don't tell while we are initting. */ 880 continue; 881 882 /* First, look if it's a process from the dead queue. */ 883 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 884 if (q->dq_pid == pid) { 885 TAILQ_REMOVE(&deadq_head, q, dq_entries); 886 free(q); 887 goto oncemore; 888 } 889 890 /* Now, look in list of active processes. */ 891 for (f = Files; f; f = f->f_next) 892 if (f->f_type == F_PIPE && 893 f->f_un.f_pipe.f_pid == pid) { 894 (void)close(f->f_file); 895 896 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 897 f->f_un.f_pipe.f_pid = 0; 898 if (WIFSIGNALED(status)) { 899 reason = "due to signal"; 900 code = WTERMSIG(status); 901 } else { 902 reason = "with status"; 903 code = WEXITSTATUS(status); 904 if (code == 0) 905 goto oncemore; /* Exited OK. */ 906 } 907 (void)snprintf(buf, sizeof buf, 908 "Logging subprocess %d (%s) exited %s %d.", 909 pid, f->f_un.f_pipe.f_pname, 910 reason, code); 911 logerror(buf); 912 break; 913 } 914 oncemore: 915 } 916 } 917 918 /* 919 * Return a printable representation of a host address. 920 */ 921 char * 922 cvthname(f) 923 struct sockaddr_in *f; 924 { 925 struct hostent *hp; 926 char *p; 927 928 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 929 930 if (f->sin_family != AF_INET) { 931 dprintf("Malformed from address\n"); 932 return ("???"); 933 } 934 hp = gethostbyaddr((char *)&f->sin_addr, 935 sizeof(struct in_addr), f->sin_family); 936 if (hp == 0) { 937 dprintf("Host name for your address (%s) unknown\n", 938 inet_ntoa(f->sin_addr)); 939 return (inet_ntoa(f->sin_addr)); 940 } 941 if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 942 *p = '\0'; 943 return (hp->h_name); 944 } 945 946 void 947 domark(signo) 948 int signo; 949 { 950 struct filed *f; 951 dq_t q; 952 953 now = time((time_t *)NULL); 954 MarkSeq += TIMERINTVL; 955 if (MarkSeq >= MarkInterval) { 956 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 957 MarkSeq = 0; 958 } 959 960 for (f = Files; f; f = f->f_next) { 961 if (f->f_prevcount && now >= REPEATTIME(f)) { 962 dprintf("flush %s: repeated %d times, %d sec.\n", 963 TypeNames[f->f_type], f->f_prevcount, 964 repeatinterval[f->f_repeatcount]); 965 fprintlog(f, 0, (char *)NULL); 966 BACKOFF(f); 967 } 968 } 969 970 /* Walk the dead queue, and see if we should signal somebody. */ 971 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 972 switch (q->dq_timeout) { 973 case 0: 974 /* Already signalled once, try harder now. */ 975 kill(q->dq_pid, SIGKILL); 976 break; 977 978 case 1: 979 /* 980 * Timed out on dead queue, send terminate 981 * signal. Note that we leave the removal 982 * from the dead queue to reapchild(), which 983 * will also log the event. 984 */ 985 kill(q->dq_pid, SIGTERM); 986 /* FALLTROUGH */ 987 988 default: 989 q->dq_timeout--; 990 } 991 992 (void)alarm(TIMERINTVL); 993 } 994 995 /* 996 * Print syslogd errors some place. 997 */ 998 void 999 logerror(type) 1000 const char *type; 1001 { 1002 char buf[512]; 1003 1004 if (errno) 1005 (void)snprintf(buf, 1006 sizeof(buf), "syslogd: %s: %s", type, strerror(errno)); 1007 else 1008 (void)snprintf(buf, sizeof(buf), "syslogd: %s", type); 1009 errno = 0; 1010 dprintf("%s\n", buf); 1011 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1012 } 1013 1014 void 1015 die(signo) 1016 int signo; 1017 { 1018 struct filed *f; 1019 int was_initialized; 1020 char buf[100]; 1021 1022 was_initialized = Initialized; 1023 Initialized = 0; /* Don't log SIGCHLDs. */ 1024 for (f = Files; f != NULL; f = f->f_next) { 1025 /* flush any pending output */ 1026 if (f->f_prevcount) 1027 fprintlog(f, 0, (char *)NULL); 1028 if (f->f_type == F_PIPE) 1029 (void)close(f->f_file); 1030 } 1031 Initialized = was_initialized; 1032 if (signo) { 1033 dprintf("syslogd: exiting on signal %d\n", signo); 1034 (void)sprintf(buf, "exiting on signal %d", signo); 1035 errno = 0; 1036 logerror(buf); 1037 } 1038 if (created_lsock) 1039 (void)unlink(LogName); 1040 exit(1); 1041 } 1042 1043 /* 1044 * INIT -- Initialize syslogd from configuration table 1045 */ 1046 void 1047 init(signo) 1048 int signo; 1049 { 1050 int i; 1051 FILE *cf; 1052 struct filed *f, *next, **nextp; 1053 char *p; 1054 char cline[LINE_MAX]; 1055 char prog[NAME_MAX+1]; 1056 1057 dprintf("init\n"); 1058 1059 /* 1060 * Close all open log files. 1061 */ 1062 Initialized = 0; 1063 for (f = Files; f != NULL; f = next) { 1064 /* flush any pending output */ 1065 if (f->f_prevcount) 1066 fprintlog(f, 0, (char *)NULL); 1067 1068 switch (f->f_type) { 1069 case F_FILE: 1070 case F_FORW: 1071 case F_CONSOLE: 1072 case F_TTY: 1073 (void)close(f->f_file); 1074 break; 1075 case F_PIPE: 1076 (void)close(f->f_file); 1077 if (f->f_un.f_pipe.f_pid > 0) 1078 deadq_enter(f->f_un.f_pipe.f_pid); 1079 f->f_un.f_pipe.f_pid = 0; 1080 break; 1081 } 1082 next = f->f_next; 1083 if(f->f_program) free(f->f_program); 1084 free((char *)f); 1085 } 1086 Files = NULL; 1087 nextp = &Files; 1088 1089 /* open the configuration file */ 1090 if ((cf = fopen(ConfFile, "r")) == NULL) { 1091 dprintf("cannot open %s\n", ConfFile); 1092 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1093 cfline("*.ERR\t/dev/console", *nextp, "*"); 1094 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1095 cfline("*.PANIC\t*", (*nextp)->f_next, "*"); 1096 Initialized = 1; 1097 return; 1098 } 1099 1100 /* 1101 * Foreach line in the conf table, open that file. 1102 */ 1103 f = NULL; 1104 strcpy(prog, "*"); 1105 while (fgets(cline, sizeof(cline), cf) != NULL) { 1106 /* 1107 * check for end-of-section, comments, strip off trailing 1108 * spaces and newline character. #!prog is treated specially: 1109 * following lines apply only to that program. 1110 */ 1111 for (p = cline; isspace(*p); ++p) 1112 continue; 1113 if (*p == 0) 1114 continue; 1115 if(*p == '#') { 1116 p++; 1117 if(*p!='!') 1118 continue; 1119 } 1120 if(*p=='!') { 1121 p++; 1122 while(isspace(*p)) p++; 1123 if(!*p) { 1124 strcpy(prog, "*"); 1125 continue; 1126 } 1127 for(i = 0; i < NAME_MAX; i++) { 1128 if(!isalnum(p[i])) 1129 break; 1130 prog[i] = p[i]; 1131 } 1132 prog[i] = 0; 1133 continue; 1134 } 1135 for (p = strchr(cline, '\0'); isspace(*--p);) 1136 continue; 1137 *++p = '\0'; 1138 f = (struct filed *)calloc(1, sizeof(*f)); 1139 *nextp = f; 1140 nextp = &f->f_next; 1141 cfline(cline, f, prog); 1142 } 1143 1144 /* close the configuration file */ 1145 (void)fclose(cf); 1146 1147 Initialized = 1; 1148 1149 if (Debug) { 1150 for (f = Files; f; f = f->f_next) { 1151 for (i = 0; i <= LOG_NFACILITIES; i++) 1152 if (f->f_pmask[i] == INTERNAL_NOPRI) 1153 printf("X "); 1154 else 1155 printf("%d ", f->f_pmask[i]); 1156 printf("%s: ", TypeNames[f->f_type]); 1157 switch (f->f_type) { 1158 case F_FILE: 1159 printf("%s", f->f_un.f_fname); 1160 break; 1161 1162 case F_CONSOLE: 1163 case F_TTY: 1164 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1165 break; 1166 1167 case F_FORW: 1168 printf("%s", f->f_un.f_forw.f_hname); 1169 break; 1170 1171 case F_PIPE: 1172 printf("%s", f->f_un.f_pipe.f_pname); 1173 break; 1174 1175 case F_USERS: 1176 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1177 printf("%s, ", f->f_un.f_uname[i]); 1178 break; 1179 } 1180 if(f->f_program) { 1181 printf(" (%s)", f->f_program); 1182 } 1183 printf("\n"); 1184 } 1185 } 1186 1187 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1188 dprintf("syslogd: restarted\n"); 1189 } 1190 1191 /* 1192 * Crack a configuration file line 1193 */ 1194 void 1195 cfline(line, f, prog) 1196 char *line; 1197 struct filed *f; 1198 char *prog; 1199 { 1200 struct hostent *hp; 1201 int i, pri; 1202 char *bp, *p, *q; 1203 char buf[MAXLINE], ebuf[100]; 1204 1205 dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog); 1206 1207 errno = 0; /* keep strerror() stuff out of logerror messages */ 1208 1209 /* clear out file entry */ 1210 memset(f, 0, sizeof(*f)); 1211 for (i = 0; i <= LOG_NFACILITIES; i++) 1212 f->f_pmask[i] = INTERNAL_NOPRI; 1213 1214 /* save program name if any */ 1215 if(prog && *prog=='*') prog = NULL; 1216 if(prog) { 1217 f->f_program = calloc(1, strlen(prog)+1); 1218 if(f->f_program) { 1219 strcpy(f->f_program, prog); 1220 } 1221 } 1222 1223 /* scan through the list of selectors */ 1224 for (p = line; *p && *p != '\t';) { 1225 1226 /* find the end of this facility name list */ 1227 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1228 continue; 1229 1230 /* collect priority name */ 1231 for (bp = buf; *q && !strchr("\t,;", *q); ) 1232 *bp++ = *q++; 1233 *bp = '\0'; 1234 1235 /* skip cruft */ 1236 while (strchr(", ;", *q)) 1237 q++; 1238 1239 /* decode priority name */ 1240 if (*buf == '*') 1241 pri = LOG_PRIMASK + 1; 1242 else { 1243 pri = decode(buf, prioritynames); 1244 if (pri < 0) { 1245 (void)sprintf(ebuf, 1246 "unknown priority name \"%s\"", buf); 1247 logerror(ebuf); 1248 return; 1249 } 1250 } 1251 1252 /* scan facilities */ 1253 while (*p && !strchr("\t.;", *p)) { 1254 for (bp = buf; *p && !strchr("\t,;.", *p); ) 1255 *bp++ = *p++; 1256 *bp = '\0'; 1257 if (*buf == '*') 1258 for (i = 0; i < LOG_NFACILITIES; i++) 1259 f->f_pmask[i] = pri; 1260 else { 1261 i = decode(buf, facilitynames); 1262 if (i < 0) { 1263 (void)sprintf(ebuf, 1264 "unknown facility name \"%s\"", 1265 buf); 1266 logerror(ebuf); 1267 return; 1268 } 1269 f->f_pmask[i >> 3] = pri; 1270 } 1271 while (*p == ',' || *p == ' ') 1272 p++; 1273 } 1274 1275 p = q; 1276 } 1277 1278 /* skip to action part */ 1279 while (*p == '\t') 1280 p++; 1281 1282 switch (*p) 1283 { 1284 case '@': 1285 if (!InetInuse) 1286 break; 1287 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1288 hp = gethostbyname(p); 1289 if (hp == NULL) { 1290 extern int h_errno; 1291 1292 logerror(hstrerror(h_errno)); 1293 break; 1294 } 1295 memset(&f->f_un.f_forw.f_addr, 0, 1296 sizeof(f->f_un.f_forw.f_addr)); 1297 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1298 f->f_un.f_forw.f_addr.sin_port = LogPort; 1299 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1300 f->f_type = F_FORW; 1301 break; 1302 1303 case '/': 1304 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1305 f->f_type = F_UNUSED; 1306 logerror(p); 1307 break; 1308 } 1309 if (isatty(f->f_file)) { 1310 if (strcmp(p, ctty) == 0) 1311 f->f_type = F_CONSOLE; 1312 else 1313 f->f_type = F_TTY; 1314 (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); 1315 } else { 1316 (void)strcpy(f->f_un.f_fname, p); 1317 f->f_type = F_FILE; 1318 } 1319 break; 1320 1321 case '|': 1322 f->f_un.f_pipe.f_pid = 0; 1323 (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); 1324 f->f_type = F_PIPE; 1325 break; 1326 1327 case '*': 1328 f->f_type = F_WALL; 1329 break; 1330 1331 default: 1332 for (i = 0; i < MAXUNAMES && *p; i++) { 1333 for (q = p; *q && *q != ','; ) 1334 q++; 1335 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1336 if ((q - p) > UT_NAMESIZE) 1337 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1338 else 1339 f->f_un.f_uname[i][q - p] = '\0'; 1340 while (*q == ',' || *q == ' ') 1341 q++; 1342 p = q; 1343 } 1344 f->f_type = F_USERS; 1345 break; 1346 } 1347 } 1348 1349 1350 /* 1351 * Decode a symbolic name to a numeric value 1352 */ 1353 int 1354 decode(name, codetab) 1355 const char *name; 1356 CODE *codetab; 1357 { 1358 CODE *c; 1359 char *p, buf[40]; 1360 1361 if (isdigit(*name)) 1362 return (atoi(name)); 1363 1364 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1365 if (isupper(*name)) 1366 *p = tolower(*name); 1367 else 1368 *p = *name; 1369 } 1370 *p = '\0'; 1371 for (c = codetab; c->c_name; c++) 1372 if (!strcmp(buf, c->c_name)) 1373 return (c->c_val); 1374 1375 return (-1); 1376 } 1377 1378 /* 1379 * fork off and become a daemon, but wait for the child to come online 1380 * before returing to the parent, or we get disk thrashing at boot etc. 1381 * Set a timer so we don't hang forever if it wedges. 1382 */ 1383 int 1384 waitdaemon(nochdir, noclose, maxwait) 1385 int nochdir, noclose, maxwait; 1386 { 1387 int fd; 1388 int status; 1389 pid_t pid, childpid; 1390 1391 switch (childpid = fork()) { 1392 case -1: 1393 return (-1); 1394 case 0: 1395 break; 1396 default: 1397 signal(SIGALRM, timedout); 1398 alarm(maxwait); 1399 while ((pid = wait3(&status, 0, NULL)) != -1) { 1400 if (WIFEXITED(status)) 1401 errx(1, "child pid %d exited with return code %d", 1402 pid, WEXITSTATUS(status)); 1403 if (WIFSIGNALED(status)) 1404 errx(1, "child pid %d exited on signal %d%s", 1405 pid, WTERMSIG(status), 1406 WCOREDUMP(status) ? " (core dumped)" : 1407 ""); 1408 if (pid == childpid) /* it's gone... */ 1409 break; 1410 } 1411 exit(0); 1412 } 1413 1414 if (setsid() == -1) 1415 return (-1); 1416 1417 if (!nochdir) 1418 (void)chdir("/"); 1419 1420 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1421 (void)dup2(fd, STDIN_FILENO); 1422 (void)dup2(fd, STDOUT_FILENO); 1423 (void)dup2(fd, STDERR_FILENO); 1424 if (fd > 2) 1425 (void)close (fd); 1426 } 1427 return (getppid()); 1428 } 1429 1430 /* 1431 * We get a SIGALRM from the child when it's running and finished doing it's 1432 * fsync()'s or O_SYNC writes for all the boot messages. 1433 * 1434 * We also get a signal from the kernel if the timer expires, so check to 1435 * see what happened. 1436 */ 1437 void 1438 timedout(sig) 1439 int sig __unused; 1440 { 1441 int left; 1442 left = alarm(0); 1443 signal(SIGALRM, SIG_DFL); 1444 if (left == 0) 1445 errx(1, "timed out waiting for child"); 1446 else 1447 exit(0); 1448 } 1449 1450 /* 1451 * Fairly similar to popen(3), but returns an open descriptor, as 1452 * opposed to a FILE *. 1453 */ 1454 int 1455 p_open(prog, pid) 1456 char *prog; 1457 pid_t *pid; 1458 { 1459 int pfd[2], nulldesc, i; 1460 sigset_t omask, mask; 1461 char *argv[4]; /* sh -c cmd NULL */ 1462 char errmsg[200]; 1463 1464 if (pipe(pfd) == -1) 1465 return -1; 1466 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 1467 /* we are royally screwed anyway */ 1468 return -1; 1469 1470 mask = sigmask(SIGALRM) | sigmask(SIGHUP); 1471 sigprocmask(SIG_BLOCK, &omask, &mask); 1472 switch ((*pid = fork())) { 1473 case -1: 1474 sigprocmask(SIG_SETMASK, 0, &omask); 1475 close(nulldesc); 1476 return -1; 1477 1478 case 0: 1479 argv[0] = "sh"; 1480 argv[1] = "-c"; 1481 argv[2] = prog; 1482 argv[3] = NULL; 1483 1484 alarm(0); 1485 (void)setsid(); /* Avoid catching SIGHUPs. */ 1486 1487 /* 1488 * Throw away pending signals, and reset signal 1489 * behaviour to standard values. 1490 */ 1491 signal(SIGALRM, SIG_IGN); 1492 signal(SIGHUP, SIG_IGN); 1493 sigprocmask(SIG_SETMASK, 0, &omask); 1494 signal(SIGPIPE, SIG_DFL); 1495 signal(SIGQUIT, SIG_DFL); 1496 signal(SIGALRM, SIG_DFL); 1497 signal(SIGHUP, SIG_DFL); 1498 1499 dup2(pfd[0], STDIN_FILENO); 1500 dup2(nulldesc, STDOUT_FILENO); 1501 dup2(nulldesc, STDERR_FILENO); 1502 for (i = getdtablesize(); i > 2; i--) 1503 (void) close(i); 1504 1505 (void) execvp(_PATH_BSHELL, argv); 1506 _exit(255); 1507 } 1508 1509 sigprocmask(SIG_SETMASK, 0, &omask); 1510 close(nulldesc); 1511 close(pfd[0]); 1512 /* 1513 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 1514 * supposed to get an EWOULDBLOCK on writev(2), which is 1515 * caught by the logic above anyway, which will in turn close 1516 * the pipe, and fork a new logging subprocess if necessary. 1517 * The stale subprocess will be killed some time later unless 1518 * it terminated itself due to closing its input pipe (so we 1519 * get rid of really dead puppies). 1520 */ 1521 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 1522 /* This is bad. */ 1523 (void)snprintf(errmsg, sizeof errmsg, 1524 "Warning: cannot change pipe to PID %d to " 1525 "non-blocking behaviour.", 1526 (int)*pid); 1527 logerror(errmsg); 1528 } 1529 return pfd[1]; 1530 } 1531 1532 void 1533 deadq_enter(pid) 1534 pid_t pid; 1535 { 1536 dq_t p; 1537 1538 p = malloc(sizeof(struct deadq_entry)); 1539 if (p == 0) { 1540 errno = 0; 1541 logerror("panic: out of virtual memory!"); 1542 exit(1); 1543 } 1544 1545 p->dq_pid = pid; 1546 p->dq_timeout = DQ_TIMO_INIT; 1547 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 1548 } 1549