syslogd.c revision 1.79
1 /* $NetBSD: syslogd.c,v 1.79 2006/09/15 20:32:59 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 41 #else 42 __RCSID("$NetBSD: syslogd.c,v 1.79 2006/09/15 20:32:59 christos Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 /* 47 * syslogd -- log system messages 48 * 49 * This program implements a system log. It takes a series of lines. 50 * Each line may have a priority, signified as "<n>" as 51 * the first characters of the line. If this is 52 * not present, a default priority is used. 53 * 54 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 55 * cause it to reread its configuration file. 56 * 57 * Defined Constants: 58 * 59 * MAXLINE -- the maximimum line length that can be handled. 60 * DEFUPRI -- the default priority for user messages 61 * DEFSPRI -- the default priority for kernel messages 62 * 63 * Author: Eric Allman 64 * extensive changes by Ralph Campbell 65 * more extensive changes by Eric Allman (again) 66 * Extension to log by program name as well as facility and priority 67 * by Peter da Silva. 68 * -U and -v by Harlan Stenn. 69 * Priority comparison code by Harlan Stenn. 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_NOTICE) 76 #define TIMERINTVL 30 /* interval for checking flush, mark */ 77 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 78 79 #include <sys/param.h> 80 #include <sys/socket.h> 81 #include <sys/sysctl.h> 82 #include <sys/types.h> 83 #include <sys/un.h> 84 #include <sys/wait.h> 85 #include <sys/queue.h> 86 #include <sys/event.h> 87 88 #include <netinet/in.h> 89 90 #include <assert.h> 91 #include <ctype.h> 92 #include <errno.h> 93 #include <fcntl.h> 94 #include <grp.h> 95 #include <locale.h> 96 #include <netdb.h> 97 #include <pwd.h> 98 #include <signal.h> 99 #include <stdarg.h> 100 #include <stdio.h> 101 #include <stdlib.h> 102 #include <string.h> 103 #include <unistd.h> 104 #include <util.h> 105 106 #include "utmpentry.h" 107 #include "pathnames.h" 108 109 #define SYSLOG_NAMES 110 #include <sys/syslog.h> 111 112 #ifdef LIBWRAP 113 #include <tcpd.h> 114 115 int allow_severity = LOG_AUTH|LOG_INFO; 116 int deny_severity = LOG_AUTH|LOG_WARNING; 117 #endif 118 119 char *ConfFile = _PATH_LOGCONF; 120 char ctty[] = _PATH_CONSOLE; 121 122 #define FDMASK(fd) (1 << (fd)) 123 124 #define dprintf if (Debug) printf 125 126 #define MAXUNAMES 20 /* maximum number of user names */ 127 128 /* 129 * Flags to logmsg(). 130 */ 131 132 #define IGN_CONS 0x001 /* don't print on console */ 133 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 134 #define ADDDATE 0x004 /* add a date to the message */ 135 #define MARK 0x008 /* this message is a mark */ 136 #define ISKERNEL 0x010 /* kernel generated message */ 137 138 /* 139 * This structure represents the files that will have log 140 * copies printed. 141 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY, 142 * or if f_type is F_PIPE and f_pid > 0. 143 */ 144 145 struct filed { 146 struct filed *f_next; /* next in linked list */ 147 short f_type; /* entry type, see below */ 148 short f_file; /* file descriptor */ 149 time_t f_time; /* time this was last written */ 150 char *f_host; /* host from which to record */ 151 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 152 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 153 #define PRI_LT 0x1 154 #define PRI_EQ 0x2 155 #define PRI_GT 0x4 156 char *f_program; /* program this applies to */ 157 union { 158 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 159 struct { 160 char f_hname[MAXHOSTNAMELEN]; 161 struct addrinfo *f_addr; 162 } f_forw; /* forwarding address */ 163 char f_fname[MAXPATHLEN]; 164 struct { 165 char f_pname[MAXPATHLEN]; 166 pid_t f_pid; 167 } f_pipe; 168 } f_un; 169 char f_prevline[MAXSVLINE]; /* last message logged */ 170 char f_lasttime[16]; /* time of last occurrence */ 171 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 172 int f_prevpri; /* pri of f_prevline */ 173 int f_prevlen; /* length of f_prevline */ 174 int f_prevcount; /* repetition cnt of prevline */ 175 int f_repeatcount; /* number of "repeated" msgs */ 176 int f_lasterror; /* last error on writev() */ 177 int f_flags; /* file-specific flags */ 178 #define FFLAG_SYNC 0x01 179 }; 180 181 /* 182 * Queue of about-to-be-dead processes we should watch out for. 183 */ 184 TAILQ_HEAD(, deadq_entry) deadq_head = TAILQ_HEAD_INITIALIZER(deadq_head); 185 186 typedef struct deadq_entry { 187 pid_t dq_pid; 188 int dq_timeout; 189 TAILQ_ENTRY(deadq_entry) dq_entries; 190 } *dq_t; 191 192 /* 193 * The timeout to apply to processes waiting on the dead queue. Unit 194 * of measure is "mark intervals", i.e. 20 minutes by default. 195 * Processes on the dead queue will be terminated after that time. 196 */ 197 #define DQ_TIMO_INIT 2 198 199 /* 200 * Intervals at which we flush out "message repeated" messages, 201 * in seconds after previous message is logged. After each flush, 202 * we move to the next interval until we reach the largest. 203 */ 204 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 205 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 206 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 207 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 208 (f)->f_repeatcount = MAXREPEAT; \ 209 } 210 211 /* values for f_type */ 212 #define F_UNUSED 0 /* unused entry */ 213 #define F_FILE 1 /* regular file */ 214 #define F_TTY 2 /* terminal */ 215 #define F_CONSOLE 3 /* console terminal */ 216 #define F_FORW 4 /* remote machine */ 217 #define F_USERS 5 /* list of users */ 218 #define F_WALL 6 /* everyone logged on */ 219 #define F_PIPE 7 /* pipe to program */ 220 221 char *TypeNames[8] = { 222 "UNUSED", "FILE", "TTY", "CONSOLE", 223 "FORW", "USERS", "WALL", "PIPE" 224 }; 225 226 struct filed *Files; 227 struct filed consfile; 228 229 int Debug; /* debug flag */ 230 int daemonized = 0; /* we are not daemonized yet */ 231 char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 232 char oldLocalHostName[MAXHOSTNAMELEN];/* previous hostname */ 233 char *LocalDomain; /* our local domain name */ 234 size_t LocalDomainLen; /* length of LocalDomain */ 235 int *finet = NULL; /* Internet datagram sockets */ 236 int Initialized; /* set when we have initialized ourselves */ 237 int ShuttingDown; /* set when we die() */ 238 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 239 int MarkSeq = 0; /* mark sequence number */ 240 int SecureMode = 0; /* listen only on unix domain socks */ 241 int UseNameService = 1; /* make domain name queries */ 242 int NumForwards = 0; /* number of forwarding actions in conf file */ 243 char **LogPaths; /* array of pathnames to read messages from */ 244 int NoRepeat = 0; /* disable "repeated"; log always */ 245 int RemoteAddDate = 0; /* always add date to messages from network */ 246 int SyncKernel = 0; /* write kernel messages synchronously */ 247 int UniquePriority = 0; /* only log specified priority */ 248 int LogFacPri = 0; /* put facility and priority in log messages: */ 249 /* 0=no, 1=numeric, 2=names */ 250 251 void cfline(char *, struct filed *, char *, char *); 252 char *cvthname(struct sockaddr_storage *); 253 void deadq_enter(pid_t, const char *); 254 int deadq_remove(pid_t); 255 int decode(const char *, CODE *); 256 void die(struct kevent *); /* SIGTERM kevent dispatch routine */ 257 void domark(struct kevent *);/* timer kevent dispatch routine */ 258 void fprintlog(struct filed *, int, char *); 259 int getmsgbufsize(void); 260 int* socksetup(int, const char *); 261 void init(struct kevent *); /* SIGHUP kevent dispatch routine */ 262 void logerror(const char *, ...); 263 void logmsg(int, char *, char *, int); 264 void log_deadchild(pid_t, int, const char *); 265 int matches_spec(const char *, const char *, 266 char *(*)(const char *, const char *)); 267 void printline(char *, char *, int); 268 void printsys(char *); 269 int p_open(char *, pid_t *); 270 void trim_localdomain(char *); 271 void reapchild(struct kevent *); /* SIGCHLD kevent dispatch routine */ 272 void usage(void); 273 void wallmsg(struct filed *, struct iovec *, size_t); 274 int main(int, char *[]); 275 void logpath_add(char ***, int *, int *, char *); 276 void logpath_fileadd(char ***, int *, int *, char *); 277 278 static int fkq; 279 280 static struct kevent *allocevchange(void); 281 static int wait_for_events(struct kevent *, size_t); 282 283 static void dispatch_read_klog(struct kevent *); 284 static void dispatch_read_finet(struct kevent *); 285 static void dispatch_read_funix(struct kevent *); 286 287 /* 288 * Global line buffer. Since we only process one event at a time, 289 * a global one will do. 290 */ 291 static char *linebuf; 292 static size_t linebufsize; 293 static const char *bindhostname = NULL; 294 295 #define A_CNT(x) (sizeof((x)) / sizeof((x)[0])) 296 297 int 298 main(int argc, char *argv[]) 299 { 300 int ch, *funix, j, fklog; 301 int funixsize = 0, funixmaxsize = 0; 302 struct kevent events[16]; 303 struct sockaddr_un sunx; 304 char **pp; 305 struct kevent *ev; 306 uid_t uid = 0; 307 gid_t gid = 0; 308 char *user = NULL; 309 char *group = NULL; 310 char *root = "/"; 311 char *endp; 312 struct group *gr; 313 struct passwd *pw; 314 unsigned long l; 315 316 (void)setlocale(LC_ALL, ""); 317 318 while ((ch = getopt(argc, argv, "b:dnsSf:m:p:P:ru:g:t:TUv")) != -1) 319 switch(ch) { 320 case 'b': 321 bindhostname = optarg; 322 break; 323 case 'd': /* debug */ 324 Debug++; 325 break; 326 case 'f': /* configuration file */ 327 ConfFile = optarg; 328 break; 329 case 'g': 330 group = optarg; 331 if (*group == '\0') 332 usage(); 333 break; 334 case 'm': /* mark interval */ 335 MarkInterval = atoi(optarg) * 60; 336 break; 337 case 'n': /* turn off DNS queries */ 338 UseNameService = 0; 339 break; 340 case 'p': /* path */ 341 logpath_add(&LogPaths, &funixsize, 342 &funixmaxsize, optarg); 343 break; 344 case 'P': /* file of paths */ 345 logpath_fileadd(&LogPaths, &funixsize, 346 &funixmaxsize, optarg); 347 break; 348 case 'r': /* disable "repeated" compression */ 349 NoRepeat++; 350 break; 351 case 's': /* no network listen mode */ 352 SecureMode++; 353 break; 354 case 'S': 355 SyncKernel = 1; 356 break; 357 case 't': 358 root = optarg; 359 if (*root == '\0') 360 usage(); 361 break; 362 case 'T': 363 RemoteAddDate = 1; 364 break; 365 case 'u': 366 user = optarg; 367 if (*user == '\0') 368 usage(); 369 break; 370 case 'U': /* only log specified priority */ 371 UniquePriority = 1; 372 break; 373 case 'v': /* log facility and priority */ 374 if (LogFacPri < 2) 375 LogFacPri++; 376 break; 377 default: 378 usage(); 379 } 380 if ((argc -= optind) != 0) 381 usage(); 382 383 setlinebuf(stdout); 384 385 if (user != NULL) { 386 if (isdigit((unsigned char)*user)) { 387 errno = 0; 388 endp = NULL; 389 l = strtoul(user, &endp, 0); 390 if (errno || *endp != '\0') 391 goto getuser; 392 uid = (uid_t)l; 393 if (uid != l) { 394 errno = 0; 395 logerror("UID out of range"); 396 die(NULL); 397 } 398 } else { 399 getuser: 400 if ((pw = getpwnam(user)) != NULL) { 401 uid = pw->pw_uid; 402 } else { 403 errno = 0; 404 logerror("Cannot find user `%s'", user); 405 die(NULL); 406 } 407 } 408 } 409 410 if (group != NULL) { 411 if (isdigit((unsigned char)*group)) { 412 errno = 0; 413 endp = NULL; 414 l = strtoul(group, &endp, 0); 415 if (errno || *endp != '\0') 416 goto getgroup; 417 gid = (gid_t)l; 418 if (gid != l) { 419 errno = 0; 420 logerror("GID out of range"); 421 die(NULL); 422 } 423 } else { 424 getgroup: 425 if ((gr = getgrnam(group)) != NULL) { 426 gid = gr->gr_gid; 427 } else { 428 errno = 0; 429 logerror("Cannot find group `%s'", group); 430 die(NULL); 431 } 432 } 433 } 434 435 if (access(root, F_OK | R_OK)) { 436 logerror("Cannot access `%s'", root); 437 die(NULL); 438 } 439 440 consfile.f_type = F_CONSOLE; 441 (void)strlcpy(consfile.f_un.f_fname, ctty, 442 sizeof(consfile.f_un.f_fname)); 443 linebufsize = getmsgbufsize(); 444 if (linebufsize < MAXLINE) 445 linebufsize = MAXLINE; 446 linebufsize++; 447 linebuf = malloc(linebufsize); 448 if (linebuf == NULL) { 449 logerror("Couldn't allocate line buffer"); 450 die(NULL); 451 } 452 453 #ifndef SUN_LEN 454 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 455 #endif 456 if (funixsize == 0) 457 logpath_add(&LogPaths, &funixsize, 458 &funixmaxsize, _PATH_LOG); 459 funix = (int *)malloc(sizeof(int) * funixsize); 460 if (funix == NULL) { 461 logerror("Couldn't allocate funix descriptors"); 462 die(NULL); 463 } 464 for (j = 0, pp = LogPaths; *pp; pp++, j++) { 465 dprintf("Making unix dgram socket `%s'\n", *pp); 466 unlink(*pp); 467 memset(&sunx, 0, sizeof(sunx)); 468 sunx.sun_family = AF_LOCAL; 469 (void)strncpy(sunx.sun_path, *pp, sizeof(sunx.sun_path)); 470 funix[j] = socket(AF_LOCAL, SOCK_DGRAM, 0); 471 if (funix[j] < 0 || bind(funix[j], 472 (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 473 chmod(*pp, 0666) < 0) { 474 logerror("Cannot create `%s'", *pp); 475 die(NULL); 476 } 477 dprintf("Listening on unix dgram socket `%s'\n", *pp); 478 } 479 480 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) < 0) { 481 dprintf("Can't open `%s' (%d)\n", _PATH_KLOG, errno); 482 } else { 483 dprintf("Listening on kernel log `%s'\n", _PATH_KLOG); 484 } 485 486 /* 487 * All files are open, we can drop privileges and chroot 488 */ 489 dprintf("Attempt to chroot to `%s'\n", root); 490 if (chroot(root)) { 491 logerror("Failed to chroot to `%s'", root); 492 die(NULL); 493 } 494 dprintf("Attempt to set GID/EGID to `%d'\n", gid); 495 if (setgid(gid) || setegid(gid)) { 496 logerror("Failed to set gid to `%d'", gid); 497 die(NULL); 498 } 499 dprintf("Attempt to set UID/EUID to `%d'\n", uid); 500 if (setuid(uid) || seteuid(uid)) { 501 logerror("Failed to set uid to `%d'", uid); 502 die(NULL); 503 } 504 505 /* 506 * We cannot detach from the terminal before we are sure we won't 507 * have a fatal error, because error message would not go to the 508 * terminal and would not be logged because syslogd dies. 509 * All die() calls are behind us, we can call daemon() 510 */ 511 if (!Debug) { 512 (void)daemon(0, 0); 513 daemonized = 1; 514 515 /* tuck my process id away, if i'm not in debug mode */ 516 pidfile(NULL); 517 } 518 519 /* 520 * Create the global kernel event descriptor. 521 * 522 * NOTE: We MUST do this after daemon(), bacause the kqueue() 523 * API dictates that kqueue descriptors are not inherited 524 * across forks (lame!). 525 */ 526 if ((fkq = kqueue()) < 0) { 527 logerror("Cannot create event queue"); 528 die(NULL); /* XXX This error is lost! */ 529 } 530 531 /* 532 * We must read the configuration file for the first time 533 * after the kqueue descriptor is created, because we install 534 * events during this process. 535 */ 536 init(NULL); 537 538 /* 539 * Always exit on SIGTERM. Also exit on SIGINT and SIGQUIT 540 * if we're debugging. 541 */ 542 (void)signal(SIGTERM, SIG_IGN); 543 (void)signal(SIGINT, SIG_IGN); 544 (void)signal(SIGQUIT, SIG_IGN); 545 ev = allocevchange(); 546 EV_SET(ev, SIGTERM, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 0, 0, 547 (intptr_t) die); 548 if (Debug) { 549 ev = allocevchange(); 550 EV_SET(ev, SIGINT, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 0, 0, 551 (intptr_t) die); 552 553 ev = allocevchange(); 554 EV_SET(ev, SIGQUIT, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 0, 0, 555 (intptr_t) die); 556 } 557 558 ev = allocevchange(); 559 EV_SET(ev, SIGCHLD, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 0, 0, 560 (intptr_t) reapchild); 561 562 ev = allocevchange(); 563 EV_SET(ev, 0, EVFILT_TIMER, EV_ADD | EV_ENABLE, 0, 564 TIMERINTVL * 1000 /* seconds -> ms */, (intptr_t) domark); 565 566 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 567 568 /* Re-read configuration on SIGHUP. */ 569 (void) signal(SIGHUP, SIG_IGN); 570 ev = allocevchange(); 571 EV_SET(ev, SIGHUP, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 0, 0, 572 (intptr_t) init); 573 574 if (fklog >= 0) { 575 ev = allocevchange(); 576 EV_SET(ev, fklog, EVFILT_READ, EV_ADD | EV_ENABLE, 577 0, 0, (intptr_t) dispatch_read_klog); 578 } 579 for (j = 0, pp = LogPaths; *pp; pp++, j++) { 580 ev = allocevchange(); 581 EV_SET(ev, funix[j], EVFILT_READ, EV_ADD | EV_ENABLE, 582 0, 0, (intptr_t) dispatch_read_funix); 583 } 584 585 dprintf("Off & running....\n"); 586 587 for (;;) { 588 void (*handler)(struct kevent *); 589 int i, rv; 590 591 rv = wait_for_events(events, A_CNT(events)); 592 if (rv == 0) 593 continue; 594 if (rv < 0) { 595 if (errno != EINTR) 596 logerror("kevent() failed"); 597 continue; 598 } 599 dprintf("Got an event (%d)\n", rv); 600 for (i = 0; i < rv; i++) { 601 handler = (void *) events[i].udata; 602 (*handler)(&events[i]); 603 } 604 } 605 } 606 607 void 608 usage(void) 609 { 610 611 (void)fprintf(stderr, 612 "usage: %s [-dnrSsTUv] [-f config_file] [-g group] [-m mark_interval]\n" 613 "\t[-P file_list] [-p log_socket [-p log_socket2 ...]]\n" 614 "\t[-t chroot_dir] [-u user]\n", getprogname()); 615 exit(1); 616 } 617 618 /* 619 * Dispatch routine for reading /dev/klog 620 */ 621 static void 622 dispatch_read_klog(struct kevent *ev) 623 { 624 ssize_t rv; 625 int fd = ev->ident; 626 627 dprintf("Kernel log active\n"); 628 629 rv = read(fd, linebuf, linebufsize - 1); 630 if (rv > 0) { 631 linebuf[rv] = '\0'; 632 printsys(linebuf); 633 } else if (rv < 0 && errno != EINTR) { 634 /* 635 * /dev/klog has croaked. Disable the event 636 * so it won't bother us again. 637 */ 638 struct kevent *cev = allocevchange(); 639 logerror("klog failed"); 640 EV_SET(cev, fd, EVFILT_READ, EV_DISABLE, 641 0, 0, (intptr_t) dispatch_read_klog); 642 } 643 } 644 645 /* 646 * Dispatch routine for reading Unix domain sockets. 647 */ 648 static void 649 dispatch_read_funix(struct kevent *ev) 650 { 651 struct sockaddr_un myname, fromunix; 652 ssize_t rv; 653 socklen_t sunlen; 654 int fd = ev->ident; 655 656 sunlen = sizeof(myname); 657 if (getsockname(fd, (struct sockaddr *)&myname, &sunlen) != 0) { 658 /* 659 * This should never happen, so ensure that it doesn't 660 * happen again. 661 */ 662 struct kevent *cev = allocevchange(); 663 logerror("getsockname() unix failed"); 664 EV_SET(cev, fd, EVFILT_READ, EV_DISABLE, 665 0, 0, (intptr_t) dispatch_read_funix); 666 return; 667 } 668 669 dprintf("Unix socket (%s) active\n", myname.sun_path); 670 671 sunlen = sizeof(fromunix); 672 rv = recvfrom(fd, linebuf, MAXLINE, 0, 673 (struct sockaddr *)&fromunix, &sunlen); 674 if (rv > 0) { 675 linebuf[rv] = '\0'; 676 printline(LocalHostName, linebuf, 0); 677 } else if (rv < 0 && errno != EINTR) { 678 logerror("recvfrom() unix `%s'", myname.sun_path); 679 } 680 } 681 682 /* 683 * Dispatch routine for reading Internet sockets. 684 */ 685 static void 686 dispatch_read_finet(struct kevent *ev) 687 { 688 #ifdef LIBWRAP 689 struct request_info req; 690 #endif 691 struct sockaddr_storage frominet; 692 ssize_t rv; 693 socklen_t len; 694 int fd = ev->ident; 695 int reject = 0; 696 697 dprintf("inet socket active\n"); 698 699 #ifdef LIBWRAP 700 request_init(&req, RQ_DAEMON, "syslogd", RQ_FILE, fd, NULL); 701 fromhost(&req); 702 reject = !hosts_access(&req); 703 if (reject) 704 dprintf("access denied\n"); 705 #endif 706 707 len = sizeof(frominet); 708 rv = recvfrom(fd, linebuf, MAXLINE, 0, 709 (struct sockaddr *)&frominet, &len); 710 if (rv == 0 || (rv < 0 && errno == EINTR)) 711 return; 712 else if (rv < 0) { 713 logerror("recvfrom inet"); 714 return; 715 } 716 717 linebuf[rv] = '\0'; 718 if (!reject) 719 printline(cvthname(&frominet), linebuf, 720 RemoteAddDate ? ADDDATE : 0); 721 } 722 723 /* 724 * given a pointer to an array of char *'s, a pointer to its current 725 * size and current allocated max size, and a new char * to add, add 726 * it, update everything as necessary, possibly allocating a new array 727 */ 728 void 729 logpath_add(char ***lp, int *szp, int *maxszp, char *new) 730 { 731 char **nlp; 732 int newmaxsz; 733 734 dprintf("Adding `%s' to the %p logpath list\n", new, *lp); 735 if (*szp == *maxszp) { 736 if (*maxszp == 0) { 737 newmaxsz = 4; /* start of with enough for now */ 738 *lp = NULL; 739 } else 740 newmaxsz = *maxszp * 2; 741 nlp = realloc(*lp, sizeof(char *) * (newmaxsz + 1)); 742 if (nlp == NULL) { 743 logerror("Couldn't allocate line buffer"); 744 die(NULL); 745 } 746 *lp = nlp; 747 *maxszp = newmaxsz; 748 } 749 if (((*lp)[(*szp)++] = strdup(new)) == NULL) { 750 logerror("Couldn't allocate logpath"); 751 die(NULL); 752 } 753 (*lp)[(*szp)] = NULL; /* always keep it NULL terminated */ 754 } 755 756 /* do a file of log sockets */ 757 void 758 logpath_fileadd(char ***lp, int *szp, int *maxszp, char *file) 759 { 760 FILE *fp; 761 char *line; 762 size_t len; 763 764 fp = fopen(file, "r"); 765 if (fp == NULL) { 766 logerror("Could not open socket file list `%s'", file); 767 die(NULL); 768 } 769 770 while ((line = fgetln(fp, &len))) { 771 line[len - 1] = 0; 772 logpath_add(lp, szp, maxszp, line); 773 } 774 fclose(fp); 775 } 776 777 /* 778 * Take a raw input line, decode the message, and print the message 779 * on the appropriate log files. 780 */ 781 void 782 printline(char *hname, char *msg, int flags) 783 { 784 int c, pri; 785 char *p, *q, line[MAXLINE + 1]; 786 long n; 787 788 /* test for special codes */ 789 pri = DEFUPRI; 790 p = msg; 791 if (*p == '<') { 792 errno = 0; 793 n = strtol(p + 1, &q, 10); 794 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 795 p = q + 1; 796 pri = (int)n; 797 } 798 } 799 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 800 pri = DEFUPRI; 801 802 /* 803 * Don't allow users to log kernel messages. 804 * NOTE: Since LOG_KERN == 0, this will also match 805 * messages with no facility specified. 806 */ 807 if ((pri & LOG_FACMASK) == LOG_KERN) 808 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 809 810 q = line; 811 812 while ((c = *p++) != '\0' && 813 q < &line[sizeof(line) - 2]) { 814 c &= 0177; 815 if (iscntrl(c)) 816 if (c == '\n') 817 *q++ = ' '; 818 else if (c == '\t') 819 *q++ = '\t'; 820 else { 821 *q++ = '^'; 822 *q++ = c ^ 0100; 823 } 824 else 825 *q++ = c; 826 } 827 *q = '\0'; 828 829 logmsg(pri, line, hname, flags); 830 } 831 832 /* 833 * Take a raw input line from /dev/klog, split and format similar to syslog(). 834 */ 835 void 836 printsys(char *msg) 837 { 838 int n, pri, flags, is_printf; 839 char *p, *q; 840 841 for (p = msg; *p != '\0'; ) { 842 flags = ISKERNEL | ADDDATE; 843 if (SyncKernel) 844 flags |= SYNC_FILE; 845 pri = DEFSPRI; 846 is_printf = 1; 847 if (*p == '<') { 848 errno = 0; 849 n = (int)strtol(p + 1, &q, 10); 850 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 851 p = q + 1; 852 pri = n; 853 is_printf = 0; 854 } 855 } 856 if (is_printf) { 857 /* kernel printf's come out on console */ 858 flags |= IGN_CONS; 859 } 860 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 861 pri = DEFSPRI; 862 for (q = p; *q != '\0' && *q != '\n'; q++) 863 /* look for end of line */; 864 if (*q != '\0') 865 *q++ = '\0'; 866 logmsg(pri, p, LocalHostName, flags); 867 p = q; 868 } 869 } 870 871 time_t now; 872 873 /* 874 * Check to see if `name' matches the provided specification, using the 875 * specified strstr function. 876 */ 877 int 878 matches_spec(const char *name, const char *spec, 879 char *(*check)(const char *, const char *)) 880 { 881 const char *s; 882 char prev, next; 883 884 if ((s = (*check)(spec, name)) != NULL) { 885 prev = s == spec ? ',' : *(s - 1); 886 next = *(s + strlen(name)); 887 888 if (prev == ',' && (next == '\0' || next == ',')) 889 return (1); 890 } 891 892 return (0); 893 } 894 895 /* 896 * Log a message to the appropriate log files, users, etc. based on 897 * the priority. 898 */ 899 void 900 logmsg(int pri, char *msg, char *from, int flags) 901 { 902 struct filed *f; 903 int fac, msglen, omask, prilev, i; 904 char *timestamp; 905 char prog[NAME_MAX + 1]; 906 char buf[MAXLINE + 1]; 907 908 dprintf("logmsg: pri 0%o, flags 0x%x, from %s, msg %s\n", 909 pri, flags, from, msg); 910 911 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 912 913 /* 914 * Check to see if msg looks non-standard. 915 */ 916 msglen = strlen(msg); 917 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 918 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 919 flags |= ADDDATE; 920 921 (void)time(&now); 922 if (flags & ADDDATE) 923 timestamp = ctime(&now) + 4; 924 else { 925 timestamp = msg; 926 msg += 16; 927 msglen -= 16; 928 } 929 930 /* skip leading whitespace */ 931 while (isspace((unsigned char)*msg)) { 932 msg++; 933 msglen--; 934 } 935 936 /* extract facility and priority level */ 937 if (flags & MARK) 938 fac = LOG_NFACILITIES; 939 else 940 fac = LOG_FAC(pri); 941 prilev = LOG_PRI(pri); 942 943 /* extract program name */ 944 for (i = 0; i < NAME_MAX; i++) { 945 if (!isprint((unsigned char)msg[i]) || 946 msg[i] == ':' || msg[i] == '[') 947 break; 948 prog[i] = msg[i]; 949 } 950 prog[i] = '\0'; 951 952 /* add kernel prefix for kernel messages */ 953 if (flags & ISKERNEL) { 954 snprintf(buf, sizeof(buf), "%s: %s", 955 _PATH_UNIX, msg); 956 msg = buf; 957 msglen = strlen(buf); 958 } 959 960 /* log the message to the particular outputs */ 961 if (!Initialized) { 962 f = &consfile; 963 f->f_file = open(ctty, O_WRONLY, 0); 964 965 if (f->f_file >= 0) { 966 (void)strncpy(f->f_lasttime, timestamp, 15); 967 fprintlog(f, flags, msg); 968 (void)close(f->f_file); 969 } 970 (void)sigsetmask(omask); 971 return; 972 } 973 for (f = Files; f; f = f->f_next) { 974 /* skip messages that are incorrect priority */ 975 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 976 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 977 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 978 ) 979 || f->f_pmask[fac] == INTERNAL_NOPRI) 980 continue; 981 982 /* skip messages with the incorrect host name */ 983 if (f->f_host != NULL) { 984 switch (f->f_host[0]) { 985 case '+': 986 if (! matches_spec(from, f->f_host + 1, 987 strcasestr)) 988 continue; 989 break; 990 case '-': 991 if (matches_spec(from, f->f_host + 1, 992 strcasestr)) 993 continue; 994 break; 995 } 996 } 997 998 /* skip messages with the incorrect program name */ 999 if (f->f_program != NULL) { 1000 switch (f->f_program[0]) { 1001 case '+': 1002 if (! matches_spec(prog, f->f_program + 1, 1003 strstr)) 1004 continue; 1005 break; 1006 case '-': 1007 if (matches_spec(prog, f->f_program + 1, 1008 strstr)) 1009 continue; 1010 break; 1011 default: 1012 if (! matches_spec(prog, f->f_program, 1013 strstr)) 1014 continue; 1015 break; 1016 } 1017 } 1018 1019 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1020 continue; 1021 1022 /* don't output marks to recently written files */ 1023 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1024 continue; 1025 1026 /* 1027 * suppress duplicate lines to this file unless NoRepeat 1028 */ 1029 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 1030 !NoRepeat && 1031 !strcmp(msg, f->f_prevline) && 1032 !strcasecmp(from, f->f_prevhost)) { 1033 (void)strncpy(f->f_lasttime, timestamp, 15); 1034 f->f_prevcount++; 1035 dprintf("Msg repeated %d times, %ld sec of %d\n", 1036 f->f_prevcount, (long)(now - f->f_time), 1037 repeatinterval[f->f_repeatcount]); 1038 /* 1039 * If domark would have logged this by now, 1040 * flush it now (so we don't hold isolated messages), 1041 * but back off so we'll flush less often 1042 * in the future. 1043 */ 1044 if (now > REPEATTIME(f)) { 1045 fprintlog(f, flags, (char *)NULL); 1046 BACKOFF(f); 1047 } 1048 } else { 1049 /* new line, save it */ 1050 if (f->f_prevcount) 1051 fprintlog(f, 0, (char *)NULL); 1052 f->f_repeatcount = 0; 1053 f->f_prevpri = pri; 1054 (void)strncpy(f->f_lasttime, timestamp, 15); 1055 (void)strncpy(f->f_prevhost, from, 1056 sizeof(f->f_prevhost)); 1057 if (msglen < MAXSVLINE) { 1058 f->f_prevlen = msglen; 1059 (void)strlcpy(f->f_prevline, msg, 1060 sizeof(f->f_prevline)); 1061 fprintlog(f, flags, (char *)NULL); 1062 } else { 1063 f->f_prevline[0] = 0; 1064 f->f_prevlen = 0; 1065 fprintlog(f, flags, msg); 1066 } 1067 } 1068 } 1069 (void)sigsetmask(omask); 1070 } 1071 1072 void 1073 fprintlog(struct filed *f, int flags, char *msg) 1074 { 1075 struct iovec iov[10]; 1076 struct iovec *v; 1077 struct addrinfo *r; 1078 int j, l, lsent; 1079 char line[MAXLINE + 1], repbuf[80], greetings[200]; 1080 #define ADDEV() assert(++v - iov < A_CNT(iov)) 1081 1082 v = iov; 1083 if (f->f_type == F_WALL) { 1084 v->iov_base = greetings; 1085 v->iov_len = snprintf(greetings, sizeof greetings, 1086 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1087 f->f_prevhost, ctime(&now)); 1088 ADDEV(); 1089 v->iov_base = ""; 1090 v->iov_len = 0; 1091 ADDEV(); 1092 } else { 1093 v->iov_base = f->f_lasttime; 1094 v->iov_len = 15; 1095 ADDEV(); 1096 v->iov_base = " "; 1097 v->iov_len = 1; 1098 ADDEV(); 1099 } 1100 1101 if (LogFacPri) { 1102 static char fp_buf[30]; 1103 const char *f_s = NULL, *p_s = NULL; 1104 int fac = f->f_prevpri & LOG_FACMASK; 1105 int pri = LOG_PRI(f->f_prevpri); 1106 char f_n[5], p_n[5]; 1107 1108 if (LogFacPri > 1) { 1109 CODE *c; 1110 1111 for (c = facilitynames; c->c_name != NULL; c++) { 1112 if (c->c_val == fac) { 1113 f_s = c->c_name; 1114 break; 1115 } 1116 } 1117 for (c = prioritynames; c->c_name != NULL; c++) { 1118 if (c->c_val == pri) { 1119 p_s = c->c_name; 1120 break; 1121 } 1122 } 1123 } 1124 if (f_s == NULL) { 1125 snprintf(f_n, sizeof(f_n), "%d", LOG_FAC(fac)); 1126 f_s = f_n; 1127 } 1128 if (p_s == NULL) { 1129 snprintf(p_n, sizeof(p_n), "%d", pri); 1130 p_s = p_n; 1131 } 1132 snprintf(fp_buf, sizeof(fp_buf), "<%s.%s>", f_s, p_s); 1133 v->iov_base = fp_buf; 1134 v->iov_len = strlen(fp_buf); 1135 } else { 1136 v->iov_base = ""; 1137 v->iov_len = 0; 1138 } 1139 ADDEV(); 1140 1141 v->iov_base = f->f_prevhost; 1142 v->iov_len = strlen(v->iov_base); 1143 ADDEV(); 1144 v->iov_base = " "; 1145 v->iov_len = 1; 1146 ADDEV(); 1147 1148 if (msg) { 1149 v->iov_base = msg; 1150 v->iov_len = strlen(msg); 1151 } else if (f->f_prevcount > 1) { 1152 v->iov_base = repbuf; 1153 v->iov_len = snprintf(repbuf, sizeof repbuf, 1154 "last message repeated %d times", f->f_prevcount); 1155 } else { 1156 v->iov_base = f->f_prevline; 1157 v->iov_len = f->f_prevlen; 1158 } 1159 ADDEV(); 1160 1161 dprintf("Logging to %s", TypeNames[f->f_type]); 1162 f->f_time = now; 1163 1164 switch (f->f_type) { 1165 case F_UNUSED: 1166 dprintf("\n"); 1167 break; 1168 1169 case F_FORW: 1170 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1171 /* 1172 * check for local vs remote messages 1173 * (from FreeBSD PR#bin/7055) 1174 */ 1175 if (strcasecmp(f->f_prevhost, LocalHostName)) { 1176 l = snprintf(line, sizeof(line) - 1, 1177 "<%d>%.15s [%s]: %s", 1178 f->f_prevpri, (char *) iov[0].iov_base, 1179 f->f_prevhost, (char *) iov[5].iov_base); 1180 } else { 1181 l = snprintf(line, sizeof(line) - 1, "<%d>%.15s %s", 1182 f->f_prevpri, (char *) iov[0].iov_base, 1183 (char *) iov[5].iov_base); 1184 } 1185 if (l > MAXLINE) 1186 l = MAXLINE; 1187 if (finet) { 1188 lsent = -1; 1189 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1190 for (j = 0; j < *finet; j++) { 1191 #if 0 1192 /* 1193 * should we check AF first, or just 1194 * trial and error? FWD 1195 */ 1196 if (r->ai_family == 1197 address_family_of(finet[j+1])) 1198 #endif 1199 lsent = sendto(finet[j+1], line, l, 0, 1200 r->ai_addr, r->ai_addrlen); 1201 if (lsent == l) 1202 break; 1203 } 1204 } 1205 if (lsent != l) { 1206 f->f_type = F_UNUSED; 1207 logerror("sendto() failed"); 1208 } 1209 } 1210 break; 1211 1212 case F_PIPE: 1213 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1214 v->iov_base = "\n"; 1215 v->iov_len = 1; 1216 ADDEV(); 1217 if (f->f_un.f_pipe.f_pid == 0) { 1218 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1219 &f->f_un.f_pipe.f_pid)) < 0) { 1220 f->f_type = F_UNUSED; 1221 logerror(f->f_un.f_pipe.f_pname); 1222 break; 1223 } 1224 } 1225 if (writev(f->f_file, iov, v - iov) < 0) { 1226 int e = errno; 1227 if (f->f_un.f_pipe.f_pid > 0) { 1228 (void) close(f->f_file); 1229 deadq_enter(f->f_un.f_pipe.f_pid, 1230 f->f_un.f_pipe.f_pname); 1231 } 1232 f->f_un.f_pipe.f_pid = 0; 1233 /* 1234 * If the error was EPIPE, then what is likely 1235 * has happened is we have a command that is 1236 * designed to take a single message line and 1237 * then exit, but we tried to feed it another 1238 * one before we reaped the child and thus 1239 * reset our state. 1240 * 1241 * Well, now we've reset our state, so try opening 1242 * the pipe and sending the message again if EPIPE 1243 * was the error. 1244 */ 1245 if (e == EPIPE) { 1246 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1247 &f->f_un.f_pipe.f_pid)) < 0) { 1248 f->f_type = F_UNUSED; 1249 logerror(f->f_un.f_pipe.f_pname); 1250 break; 1251 } 1252 if (writev(f->f_file, iov, v - iov) < 0) { 1253 e = errno; 1254 if (f->f_un.f_pipe.f_pid > 0) { 1255 (void) close(f->f_file); 1256 deadq_enter(f->f_un.f_pipe.f_pid, 1257 f->f_un.f_pipe.f_pname); 1258 } 1259 f->f_un.f_pipe.f_pid = 0; 1260 } else 1261 e = 0; 1262 } 1263 if (e != 0) { 1264 errno = e; 1265 logerror(f->f_un.f_pipe.f_pname); 1266 } 1267 } 1268 break; 1269 1270 case F_CONSOLE: 1271 if (flags & IGN_CONS) { 1272 dprintf(" (ignored)\n"); 1273 break; 1274 } 1275 /* FALLTHROUGH */ 1276 1277 case F_TTY: 1278 case F_FILE: 1279 dprintf(" %s\n", f->f_un.f_fname); 1280 if (f->f_type != F_FILE) { 1281 v->iov_base = "\r\n"; 1282 v->iov_len = 2; 1283 } else { 1284 v->iov_base = "\n"; 1285 v->iov_len = 1; 1286 } 1287 ADDEV(); 1288 again: 1289 if (writev(f->f_file, iov, v - iov) < 0) { 1290 int e = errno; 1291 if (f->f_type == F_FILE && e == ENOSPC) { 1292 int lasterror = f->f_lasterror; 1293 f->f_lasterror = e; 1294 if (lasterror != e) 1295 logerror(f->f_un.f_fname); 1296 break; 1297 } 1298 (void)close(f->f_file); 1299 /* 1300 * Check for errors on TTY's due to loss of tty 1301 */ 1302 if ((e == EIO || e == EBADF) && f->f_type != F_FILE) { 1303 f->f_file = open(f->f_un.f_fname, 1304 O_WRONLY|O_APPEND, 0); 1305 if (f->f_file < 0) { 1306 f->f_type = F_UNUSED; 1307 logerror(f->f_un.f_fname); 1308 } else 1309 goto again; 1310 } else { 1311 f->f_type = F_UNUSED; 1312 errno = e; 1313 f->f_lasterror = e; 1314 logerror(f->f_un.f_fname); 1315 } 1316 } else { 1317 f->f_lasterror = 0; 1318 if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) 1319 (void)fsync(f->f_file); 1320 } 1321 break; 1322 1323 case F_USERS: 1324 case F_WALL: 1325 dprintf("\n"); 1326 v->iov_base = "\r\n"; 1327 v->iov_len = 2; 1328 ADDEV(); 1329 wallmsg(f, iov, v - iov); 1330 break; 1331 } 1332 f->f_prevcount = 0; 1333 } 1334 1335 /* 1336 * WALLMSG -- Write a message to the world at large 1337 * 1338 * Write the specified message to either the entire 1339 * world, or a list of approved users. 1340 */ 1341 void 1342 wallmsg(struct filed *f, struct iovec *iov, size_t iovcnt) 1343 { 1344 static int reenter; /* avoid calling ourselves */ 1345 int i; 1346 char *p; 1347 static struct utmpentry *ohead = NULL; 1348 struct utmpentry *ep; 1349 1350 if (reenter++) 1351 return; 1352 1353 (void)getutentries(NULL, &ep); 1354 if (ep != ohead) { 1355 freeutentries(ohead); 1356 ohead = ep; 1357 } 1358 /* NOSTRICT */ 1359 for (; ep; ep = ep->next) { 1360 if (f->f_type == F_WALL) { 1361 if ((p = ttymsg(iov, iovcnt, ep->line, TTYMSGTIME)) 1362 != NULL) { 1363 errno = 0; /* already in msg */ 1364 logerror(p); 1365 } 1366 continue; 1367 } 1368 /* should we send the message to this user? */ 1369 for (i = 0; i < MAXUNAMES; i++) { 1370 if (!f->f_un.f_uname[i][0]) 1371 break; 1372 if (strcmp(f->f_un.f_uname[i], ep->name) == 0) { 1373 if ((p = ttymsg(iov, iovcnt, ep->line, 1374 TTYMSGTIME)) != NULL) { 1375 errno = 0; /* already in msg */ 1376 logerror(p); 1377 } 1378 break; 1379 } 1380 } 1381 } 1382 reenter = 0; 1383 } 1384 1385 void 1386 reapchild(struct kevent *ev) 1387 { 1388 int status; 1389 pid_t pid; 1390 struct filed *f; 1391 1392 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) { 1393 if (!Initialized || ShuttingDown) { 1394 /* 1395 * Be silent while we are initializing or 1396 * shutting down. 1397 */ 1398 continue; 1399 } 1400 1401 if (deadq_remove(pid)) 1402 continue; 1403 1404 /* Now, look in the list of active processes. */ 1405 for (f = Files; f != NULL; f = f->f_next) { 1406 if (f->f_type == F_PIPE && 1407 f->f_un.f_pipe.f_pid == pid) { 1408 (void) close(f->f_file); 1409 f->f_un.f_pipe.f_pid = 0; 1410 log_deadchild(pid, status, 1411 f->f_un.f_pipe.f_pname); 1412 break; 1413 } 1414 } 1415 } 1416 } 1417 1418 /* 1419 * Return a printable representation of a host address. 1420 */ 1421 char * 1422 cvthname(struct sockaddr_storage *f) 1423 { 1424 int error; 1425 const int niflag = NI_DGRAM; 1426 static char host[NI_MAXHOST], ip[NI_MAXHOST]; 1427 1428 error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len, 1429 ip, sizeof ip, NULL, 0, NI_NUMERICHOST|niflag); 1430 1431 dprintf("cvthname(%s)\n", ip); 1432 1433 if (error) { 1434 dprintf("Malformed from address %s\n", gai_strerror(error)); 1435 return ("???"); 1436 } 1437 1438 if (!UseNameService) 1439 return (ip); 1440 1441 error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len, 1442 host, sizeof host, NULL, 0, niflag); 1443 if (error) { 1444 dprintf("Host name for your address (%s) unknown\n", ip); 1445 return (ip); 1446 } 1447 1448 trim_localdomain(host); 1449 1450 return (host); 1451 } 1452 1453 void 1454 trim_localdomain(char *host) 1455 { 1456 size_t hl; 1457 1458 hl = strlen(host); 1459 if (hl > 0 && host[hl - 1] == '.') 1460 host[--hl] = '\0'; 1461 1462 if (hl > LocalDomainLen && host[hl - LocalDomainLen - 1] == '.' && 1463 strcasecmp(&host[hl - LocalDomainLen], LocalDomain) == 0) 1464 host[hl - LocalDomainLen - 1] = '\0'; 1465 } 1466 1467 void 1468 domark(struct kevent *ev) 1469 { 1470 struct filed *f; 1471 dq_t q, nextq; 1472 1473 /* 1474 * XXX Should we bother to adjust for the # of times the timer 1475 * has expired (i.e. in case we miss one?). This information is 1476 * returned to us in ev->data. 1477 */ 1478 1479 now = time((time_t *)NULL); 1480 MarkSeq += TIMERINTVL; 1481 if (MarkSeq >= MarkInterval) { 1482 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 1483 MarkSeq = 0; 1484 } 1485 1486 for (f = Files; f; f = f->f_next) { 1487 if (f->f_prevcount && now >= REPEATTIME(f)) { 1488 dprintf("Flush %s: repeated %d times, %d sec.\n", 1489 TypeNames[f->f_type], f->f_prevcount, 1490 repeatinterval[f->f_repeatcount]); 1491 fprintlog(f, 0, (char *)NULL); 1492 BACKOFF(f); 1493 } 1494 } 1495 1496 /* Walk the dead queue, and see if we should signal somebody. */ 1497 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = nextq) { 1498 nextq = TAILQ_NEXT(q, dq_entries); 1499 switch (q->dq_timeout) { 1500 case 0: 1501 /* Already signalled once, try harder now. */ 1502 if (kill(q->dq_pid, SIGKILL) != 0) 1503 (void) deadq_remove(q->dq_pid); 1504 break; 1505 1506 case 1: 1507 /* 1508 * Timed out on the dead queue, send terminate 1509 * signal. Note that we leave the removal from 1510 * the dead queue to reapchild(), which will 1511 * also log the event (unless the process 1512 * didn't even really exist, in case we simply 1513 * drop it from the dead queue). 1514 */ 1515 if (kill(q->dq_pid, SIGTERM) != 0) { 1516 (void) deadq_remove(q->dq_pid); 1517 break; 1518 } 1519 /* FALLTHROUGH */ 1520 1521 default: 1522 q->dq_timeout--; 1523 } 1524 } 1525 } 1526 1527 /* 1528 * Print syslogd errors some place. 1529 */ 1530 void 1531 logerror(const char *fmt, ...) 1532 { 1533 static int logerror_running; 1534 va_list ap; 1535 char tmpbuf[BUFSIZ]; 1536 char buf[BUFSIZ]; 1537 1538 /* If there's an error while trying to log an error, give up. */ 1539 if (logerror_running) 1540 return; 1541 logerror_running = 1; 1542 1543 va_start(ap, fmt); 1544 1545 (void)vsnprintf(tmpbuf, sizeof(tmpbuf), fmt, ap); 1546 1547 va_end(ap); 1548 1549 if (errno) 1550 (void)snprintf(buf, sizeof(buf), "syslogd: %s: %s", 1551 tmpbuf, strerror(errno)); 1552 else 1553 (void)snprintf(buf, sizeof(buf), "syslogd: %s", tmpbuf); 1554 1555 if (daemonized) 1556 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1557 if (!daemonized && Debug) 1558 dprintf("%s\n", buf); 1559 if (!daemonized && !Debug) 1560 printf("%s\n", buf); 1561 1562 logerror_running = 0; 1563 } 1564 1565 void 1566 die(struct kevent *ev) 1567 { 1568 struct filed *f; 1569 char **p; 1570 1571 ShuttingDown = 1; /* Don't log SIGCHLDs. */ 1572 for (f = Files; f != NULL; f = f->f_next) { 1573 /* flush any pending output */ 1574 if (f->f_prevcount) 1575 fprintlog(f, 0, (char *)NULL); 1576 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1577 (void) close(f->f_file); 1578 f->f_un.f_pipe.f_pid = 0; 1579 } 1580 } 1581 errno = 0; 1582 if (ev != NULL) 1583 logerror("Exiting on signal %d", (int) ev->ident); 1584 else 1585 logerror("Fatal error, exiting"); 1586 for (p = LogPaths; p && *p; p++) 1587 unlink(*p); 1588 exit(0); 1589 } 1590 1591 /* 1592 * INIT -- Initialize syslogd from configuration table 1593 */ 1594 void 1595 init(struct kevent *ev) 1596 { 1597 int i; 1598 FILE *cf; 1599 struct filed *f, *next, **nextp; 1600 char *p; 1601 char cline[LINE_MAX]; 1602 char prog[NAME_MAX + 1]; 1603 char host[MAXHOSTNAMELEN]; 1604 char hostMsg[2*MAXHOSTNAMELEN + 40]; 1605 1606 dprintf("init\n"); 1607 1608 (void)strlcpy(oldLocalHostName, LocalHostName, 1609 sizeof(oldLocalHostName)); 1610 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 1611 if ((p = strchr(LocalHostName, '.')) != NULL) { 1612 *p++ = '\0'; 1613 LocalDomain = p; 1614 } else 1615 LocalDomain = ""; 1616 LocalDomainLen = strlen(LocalDomain); 1617 1618 /* 1619 * Close all open log files. 1620 */ 1621 Initialized = 0; 1622 for (f = Files; f != NULL; f = next) { 1623 /* flush any pending output */ 1624 if (f->f_prevcount) 1625 fprintlog(f, 0, (char *)NULL); 1626 1627 switch (f->f_type) { 1628 case F_FILE: 1629 case F_TTY: 1630 case F_CONSOLE: 1631 (void)close(f->f_file); 1632 break; 1633 case F_PIPE: 1634 if (f->f_un.f_pipe.f_pid > 0) { 1635 (void)close(f->f_file); 1636 deadq_enter(f->f_un.f_pipe.f_pid, 1637 f->f_un.f_pipe.f_pname); 1638 } 1639 f->f_un.f_pipe.f_pid = 0; 1640 break; 1641 case F_FORW: 1642 if (f->f_un.f_forw.f_addr) 1643 freeaddrinfo(f->f_un.f_forw.f_addr); 1644 break; 1645 } 1646 next = f->f_next; 1647 if (f->f_program != NULL) 1648 free(f->f_program); 1649 if (f->f_host != NULL) 1650 free(f->f_host); 1651 free((char *)f); 1652 } 1653 Files = NULL; 1654 nextp = &Files; 1655 1656 /* 1657 * Close all open sockets 1658 */ 1659 1660 if (finet) { 1661 for (i = 0; i < *finet; i++) { 1662 if (close(finet[i+1]) < 0) { 1663 logerror("close() failed"); 1664 die(NULL); 1665 } 1666 } 1667 } 1668 1669 /* 1670 * Reset counter of forwarding actions 1671 */ 1672 1673 NumForwards=0; 1674 1675 /* open the configuration file */ 1676 if ((cf = fopen(ConfFile, "r")) == NULL) { 1677 dprintf("Cannot open `%s'\n", ConfFile); 1678 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1679 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1680 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1681 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1682 Initialized = 1; 1683 return; 1684 } 1685 1686 /* 1687 * Foreach line in the conf table, open that file. 1688 */ 1689 f = NULL; 1690 strcpy(prog, "*"); 1691 strcpy(host, "*"); 1692 while (fgets(cline, sizeof(cline), cf) != NULL) { 1693 /* 1694 * check for end-of-section, comments, strip off trailing 1695 * spaces and newline character. #!prog is treated specially: 1696 * following lines apply only to that program. 1697 */ 1698 for (p = cline; isspace((unsigned char)*p); ++p) 1699 continue; 1700 if (*p == '\0') 1701 continue; 1702 if (*p == '#') { 1703 p++; 1704 if (*p != '!' && *p != '+' && *p != '-') 1705 continue; 1706 } 1707 if (*p == '+' || *p == '-') { 1708 host[0] = *p++; 1709 while (isspace((unsigned char)*p)) 1710 p++; 1711 if (*p == '\0' || *p == '*') { 1712 strcpy(host, "*"); 1713 continue; 1714 } 1715 if (*p == '@') 1716 p = LocalHostName; 1717 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1718 if (!isalnum((unsigned char)*p) && 1719 *p != '.' && *p != '-' && *p != ',') 1720 break; 1721 host[i] = *p++; 1722 } 1723 host[i] = '\0'; 1724 continue; 1725 } 1726 if (*p == '!') { 1727 p++; 1728 while (isspace((unsigned char)*p)) 1729 p++; 1730 if (*p == '\0' || *p == '*') { 1731 strcpy(prog, "*"); 1732 continue; 1733 } 1734 for (i = 0; i < NAME_MAX; i++) { 1735 if (!isprint((unsigned char)p[i])) 1736 break; 1737 prog[i] = p[i]; 1738 } 1739 prog[i] = '\0'; 1740 continue; 1741 } 1742 for (p = strchr(cline, '\0'); isspace((unsigned char)*--p);) 1743 continue; 1744 *++p = '\0'; 1745 f = (struct filed *)calloc(1, sizeof(*f)); 1746 *nextp = f; 1747 nextp = &f->f_next; 1748 cfline(cline, f, prog, host); 1749 } 1750 1751 /* close the configuration file */ 1752 (void)fclose(cf); 1753 1754 Initialized = 1; 1755 1756 if (Debug) { 1757 for (f = Files; f; f = f->f_next) { 1758 for (i = 0; i <= LOG_NFACILITIES; i++) 1759 if (f->f_pmask[i] == INTERNAL_NOPRI) 1760 printf("X "); 1761 else 1762 printf("%d ", f->f_pmask[i]); 1763 printf("%s: ", TypeNames[f->f_type]); 1764 switch (f->f_type) { 1765 case F_FILE: 1766 case F_TTY: 1767 case F_CONSOLE: 1768 printf("%s", f->f_un.f_fname); 1769 break; 1770 1771 case F_FORW: 1772 printf("%s", f->f_un.f_forw.f_hname); 1773 break; 1774 1775 case F_PIPE: 1776 printf("%s", f->f_un.f_pipe.f_pname); 1777 break; 1778 1779 case F_USERS: 1780 for (i = 0; 1781 i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1782 printf("%s, ", f->f_un.f_uname[i]); 1783 break; 1784 } 1785 if (f->f_program != NULL) 1786 printf(" (%s)", f->f_program); 1787 printf("\n"); 1788 } 1789 } 1790 1791 finet = socksetup(PF_UNSPEC, bindhostname); 1792 if (finet) { 1793 if (SecureMode) { 1794 for (i = 0; i < *finet; i++) { 1795 if (shutdown(finet[i+1], SHUT_RD) < 0) { 1796 logerror("shutdown() failed"); 1797 die(NULL); 1798 } 1799 } 1800 } else 1801 dprintf("Listening on inet and/or inet6 socket\n"); 1802 dprintf("Sending on inet and/or inet6 socket\n"); 1803 } 1804 1805 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1806 dprintf("syslogd: restarted\n"); 1807 /* 1808 * Log a change in hostname, but only on a restart (we detect this 1809 * by checking to see if we're passed a kevent). 1810 */ 1811 if (ev != NULL && strcmp(oldLocalHostName, LocalHostName) != 0) { 1812 (void)snprintf(hostMsg, sizeof(hostMsg), 1813 "syslogd: host name changed, \"%s\" to \"%s\"", 1814 oldLocalHostName, LocalHostName); 1815 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1816 dprintf("%s\n", hostMsg); 1817 } 1818 } 1819 1820 /* 1821 * Crack a configuration file line 1822 */ 1823 void 1824 cfline(char *line, struct filed *f, char *prog, char *host) 1825 { 1826 struct addrinfo hints, *res; 1827 int error, i, pri, syncfile; 1828 char *bp, *p, *q; 1829 char buf[MAXLINE]; 1830 1831 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1832 1833 errno = 0; /* keep strerror() stuff out of logerror messages */ 1834 1835 /* clear out file entry */ 1836 memset(f, 0, sizeof(*f)); 1837 for (i = 0; i <= LOG_NFACILITIES; i++) 1838 f->f_pmask[i] = INTERNAL_NOPRI; 1839 1840 /* 1841 * There should not be any space before the log facility. 1842 * Check this is okay, complain and fix if it is not. 1843 */ 1844 q = line; 1845 if (isblank((unsigned char)*line)) { 1846 errno = 0; 1847 logerror( 1848 "Warning: `%s' space or tab before the log facility", 1849 line); 1850 /* Fix: strip all spaces/tabs before the log facility */ 1851 while (*q++ && isblank((unsigned char)*q)) 1852 /* skip blanks */; 1853 line = q; 1854 } 1855 1856 /* 1857 * q is now at the first char of the log facility 1858 * There should be at least one tab after the log facility 1859 * Check this is okay, and complain and fix if it is not. 1860 */ 1861 q = line + strlen(line); 1862 while (!isblank((unsigned char)*q) && (q != line)) 1863 q--; 1864 if ((q == line) && strlen(line)) { 1865 /* No tabs or space in a non empty line: complain */ 1866 errno = 0; 1867 logerror( 1868 "Error: `%s' log facility or log target missing", 1869 line); 1870 return; 1871 } 1872 1873 /* save host name, if any */ 1874 if (*host == '*') 1875 f->f_host = NULL; 1876 else { 1877 f->f_host = strdup(host); 1878 trim_localdomain(f->f_host); 1879 } 1880 1881 /* save program name, if any */ 1882 if (*prog == '*') 1883 f->f_program = NULL; 1884 else 1885 f->f_program = strdup(prog); 1886 1887 /* scan through the list of selectors */ 1888 for (p = line; *p && !isblank((unsigned char)*p);) { 1889 int pri_done, pri_cmp, pri_invert; 1890 1891 /* find the end of this facility name list */ 1892 for (q = p; *q && !isblank((unsigned char)*q) && *q++ != '.'; ) 1893 continue; 1894 1895 /* get the priority comparison */ 1896 pri_cmp = 0; 1897 pri_done = 0; 1898 pri_invert = 0; 1899 if (*q == '!') { 1900 pri_invert = 1; 1901 q++; 1902 } 1903 while (! pri_done) { 1904 switch (*q) { 1905 case '<': 1906 pri_cmp = PRI_LT; 1907 q++; 1908 break; 1909 case '=': 1910 pri_cmp = PRI_EQ; 1911 q++; 1912 break; 1913 case '>': 1914 pri_cmp = PRI_GT; 1915 q++; 1916 break; 1917 default: 1918 pri_done = 1; 1919 break; 1920 } 1921 } 1922 1923 /* collect priority name */ 1924 for (bp = buf; *q && !strchr("\t ,;", *q); ) 1925 *bp++ = *q++; 1926 *bp = '\0'; 1927 1928 /* skip cruft */ 1929 while (strchr(",;", *q)) 1930 q++; 1931 1932 /* decode priority name */ 1933 if (*buf == '*') { 1934 pri = LOG_PRIMASK + 1; 1935 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1936 } else { 1937 pri = decode(buf, prioritynames); 1938 if (pri < 0) { 1939 errno = 0; 1940 logerror("Unknown priority name `%s'", buf); 1941 return; 1942 } 1943 } 1944 if (pri_cmp == 0) 1945 pri_cmp = UniquePriority ? PRI_EQ 1946 : PRI_EQ | PRI_GT; 1947 if (pri_invert) 1948 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1949 1950 /* scan facilities */ 1951 while (*p && !strchr("\t .;", *p)) { 1952 for (bp = buf; *p && !strchr("\t ,;.", *p); ) 1953 *bp++ = *p++; 1954 *bp = '\0'; 1955 if (*buf == '*') 1956 for (i = 0; i < LOG_NFACILITIES; i++) { 1957 f->f_pmask[i] = pri; 1958 f->f_pcmp[i] = pri_cmp; 1959 } 1960 else { 1961 i = decode(buf, facilitynames); 1962 if (i < 0) { 1963 errno = 0; 1964 logerror("Unknown facility name `%s'", 1965 buf); 1966 return; 1967 } 1968 f->f_pmask[i >> 3] = pri; 1969 f->f_pcmp[i >> 3] = pri_cmp; 1970 } 1971 while (*p == ',' || *p == ' ') 1972 p++; 1973 } 1974 1975 p = q; 1976 } 1977 1978 /* skip to action part */ 1979 while (isblank((unsigned char)*p)) 1980 p++; 1981 1982 if (*p == '-') { 1983 syncfile = 0; 1984 p++; 1985 } else 1986 syncfile = 1; 1987 1988 switch (*p) { 1989 case '@': 1990 (void)strlcpy(f->f_un.f_forw.f_hname, ++p, 1991 sizeof(f->f_un.f_forw.f_hname)); 1992 memset(&hints, 0, sizeof(hints)); 1993 hints.ai_family = AF_UNSPEC; 1994 hints.ai_socktype = SOCK_DGRAM; 1995 hints.ai_protocol = 0; 1996 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1997 &res); 1998 if (error) { 1999 logerror(gai_strerror(error)); 2000 break; 2001 } 2002 f->f_un.f_forw.f_addr = res; 2003 f->f_type = F_FORW; 2004 NumForwards++; 2005 break; 2006 2007 case '/': 2008 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2009 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 2010 f->f_type = F_UNUSED; 2011 logerror(p); 2012 break; 2013 } 2014 if (syncfile) 2015 f->f_flags |= FFLAG_SYNC; 2016 if (isatty(f->f_file)) 2017 f->f_type = F_TTY; 2018 else 2019 f->f_type = F_FILE; 2020 if (strcmp(p, ctty) == 0) 2021 f->f_type = F_CONSOLE; 2022 break; 2023 2024 case '|': 2025 f->f_un.f_pipe.f_pid = 0; 2026 (void) strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2027 sizeof(f->f_un.f_pipe.f_pname)); 2028 f->f_type = F_PIPE; 2029 break; 2030 2031 case '*': 2032 f->f_type = F_WALL; 2033 break; 2034 2035 default: 2036 for (i = 0; i < MAXUNAMES && *p; i++) { 2037 for (q = p; *q && *q != ','; ) 2038 q++; 2039 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 2040 if ((q - p) > UT_NAMESIZE) 2041 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 2042 else 2043 f->f_un.f_uname[i][q - p] = '\0'; 2044 while (*q == ',' || *q == ' ') 2045 q++; 2046 p = q; 2047 } 2048 f->f_type = F_USERS; 2049 break; 2050 } 2051 } 2052 2053 2054 /* 2055 * Decode a symbolic name to a numeric value 2056 */ 2057 int 2058 decode(const char *name, CODE *codetab) 2059 { 2060 CODE *c; 2061 char *p, buf[40]; 2062 2063 if (isdigit((unsigned char)*name)) 2064 return (atoi(name)); 2065 2066 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2067 if (isupper((unsigned char)*name)) 2068 *p = tolower((unsigned char)*name); 2069 else 2070 *p = *name; 2071 } 2072 *p = '\0'; 2073 for (c = codetab; c->c_name; c++) 2074 if (!strcmp(buf, c->c_name)) 2075 return (c->c_val); 2076 2077 return (-1); 2078 } 2079 2080 /* 2081 * Retrieve the size of the kernel message buffer, via sysctl. 2082 */ 2083 int 2084 getmsgbufsize(void) 2085 { 2086 int msgbufsize, mib[2]; 2087 size_t size; 2088 2089 mib[0] = CTL_KERN; 2090 mib[1] = KERN_MSGBUFSIZE; 2091 size = sizeof msgbufsize; 2092 if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) { 2093 dprintf("Couldn't get kern.msgbufsize\n"); 2094 return (0); 2095 } 2096 return (msgbufsize); 2097 } 2098 2099 int * 2100 socksetup(int af, const char *hostname) 2101 { 2102 struct addrinfo hints, *res, *r; 2103 struct kevent *ev; 2104 int error, maxs, *s, *socks; 2105 const int on = 1; 2106 2107 if(SecureMode && !NumForwards) 2108 return(NULL); 2109 2110 memset(&hints, 0, sizeof(hints)); 2111 hints.ai_flags = AI_PASSIVE; 2112 hints.ai_family = af; 2113 hints.ai_socktype = SOCK_DGRAM; 2114 error = getaddrinfo(hostname, "syslog", &hints, &res); 2115 if (error) { 2116 logerror(gai_strerror(error)); 2117 errno = 0; 2118 die(NULL); 2119 } 2120 2121 /* Count max number of sockets we may open */ 2122 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 2123 continue; 2124 socks = malloc((maxs+1) * sizeof(int)); 2125 if (!socks) { 2126 logerror("Couldn't allocate memory for sockets"); 2127 die(NULL); 2128 } 2129 2130 *socks = 0; /* num of sockets counter at start of array */ 2131 s = socks + 1; 2132 for (r = res; r; r = r->ai_next) { 2133 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2134 if (*s < 0) { 2135 logerror("socket() failed"); 2136 continue; 2137 } 2138 if (r->ai_family == AF_INET6 && setsockopt(*s, IPPROTO_IPV6, 2139 IPV6_V6ONLY, &on, sizeof(on)) < 0) { 2140 logerror("setsockopt(IPV6_V6ONLY) failed"); 2141 close(*s); 2142 continue; 2143 } 2144 2145 if (!SecureMode) { 2146 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2147 logerror("bind() failed"); 2148 close(*s); 2149 continue; 2150 } 2151 ev = allocevchange(); 2152 EV_SET(ev, *s, EVFILT_READ, EV_ADD | EV_ENABLE, 2153 0, 0, (intptr_t) dispatch_read_finet); 2154 } 2155 2156 *socks = *socks + 1; 2157 s++; 2158 } 2159 2160 if (*socks == 0) { 2161 free (socks); 2162 if(Debug) 2163 return(NULL); 2164 else 2165 die(NULL); 2166 } 2167 if (res) 2168 freeaddrinfo(res); 2169 2170 return(socks); 2171 } 2172 2173 /* 2174 * Fairly similar to popen(3), but returns an open descriptor, as opposed 2175 * to a FILE *. 2176 */ 2177 int 2178 p_open(char *prog, pid_t *rpid) 2179 { 2180 int pfd[2], nulldesc, i; 2181 pid_t pid; 2182 char *argv[4]; /* sh -c cmd NULL */ 2183 char errmsg[200]; 2184 2185 if (pipe(pfd) == -1) 2186 return (-1); 2187 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) { 2188 /* We are royally screwed anyway. */ 2189 return (-1); 2190 } 2191 2192 switch ((pid = fork())) { 2193 case -1: 2194 (void) close(nulldesc); 2195 return (-1); 2196 2197 case 0: 2198 argv[0] = "sh"; 2199 argv[1] = "-c"; 2200 argv[2] = prog; 2201 argv[3] = NULL; 2202 2203 (void) setsid(); /* avoid catching SIGHUPs. */ 2204 2205 /* 2206 * Reset ignored signals to their default behavior. 2207 */ 2208 (void)signal(SIGTERM, SIG_DFL); 2209 (void)signal(SIGINT, SIG_DFL); 2210 (void)signal(SIGQUIT, SIG_DFL); 2211 (void)signal(SIGPIPE, SIG_DFL); 2212 (void)signal(SIGHUP, SIG_DFL); 2213 2214 dup2(pfd[0], STDIN_FILENO); 2215 dup2(nulldesc, STDOUT_FILENO); 2216 dup2(nulldesc, STDERR_FILENO); 2217 for (i = getdtablesize(); i > 2; i--) 2218 (void) close(i); 2219 2220 (void) execvp(_PATH_BSHELL, argv); 2221 _exit(255); 2222 } 2223 2224 (void) close(nulldesc); 2225 (void) close(pfd[0]); 2226 2227 /* 2228 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2229 * supposed to get an EWOULDBLOCK on writev(2), which is 2230 * caught by the logic above anyway, which will in turn 2231 * close the pipe, and fork a new logging subprocess if 2232 * necessary. The stale subprocess will be killed some 2233 * time later unless it terminated itself due to closing 2234 * its input pipe. 2235 */ 2236 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2237 /* This is bad. */ 2238 (void) snprintf(errmsg, sizeof(errmsg), 2239 "Warning: cannot change pipe to pid %d to " 2240 "non-blocking.", (int) pid); 2241 logerror(errmsg); 2242 } 2243 *rpid = pid; 2244 return (pfd[1]); 2245 } 2246 2247 void 2248 deadq_enter(pid_t pid, const char *name) 2249 { 2250 dq_t p; 2251 int status; 2252 2253 /* 2254 * Be paranoid: if we can't signal the process, don't enter it 2255 * into the dead queue (perhaps it's already dead). If possible, 2256 * we try to fetch and log the child's status. 2257 */ 2258 if (kill(pid, 0) != 0) { 2259 if (waitpid(pid, &status, WNOHANG) > 0) 2260 log_deadchild(pid, status, name); 2261 return; 2262 } 2263 2264 p = malloc(sizeof(*p)); 2265 if (p == NULL) { 2266 errno = 0; 2267 logerror("panic: out of memory!"); 2268 exit(1); 2269 } 2270 2271 p->dq_pid = pid; 2272 p->dq_timeout = DQ_TIMO_INIT; 2273 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2274 } 2275 2276 int 2277 deadq_remove(pid_t pid) 2278 { 2279 dq_t q; 2280 2281 for (q = TAILQ_FIRST(&deadq_head); q != NULL; 2282 q = TAILQ_NEXT(q, dq_entries)) { 2283 if (q->dq_pid == pid) { 2284 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2285 free(q); 2286 return (1); 2287 } 2288 } 2289 return (0); 2290 } 2291 2292 void 2293 log_deadchild(pid_t pid, int status, const char *name) 2294 { 2295 int code; 2296 char buf[256]; 2297 const char *reason; 2298 2299 /* Keep strerror() struff out of logerror messages. */ 2300 errno = 0; 2301 if (WIFSIGNALED(status)) { 2302 reason = "due to signal"; 2303 code = WTERMSIG(status); 2304 } else { 2305 reason = "with status"; 2306 code = WEXITSTATUS(status); 2307 if (code == 0) 2308 return; 2309 } 2310 (void) snprintf(buf, sizeof(buf), 2311 "Logging subprocess %d (%s) exited %s %d.", 2312 pid, name, reason, code); 2313 logerror(buf); 2314 } 2315 2316 static struct kevent changebuf[8]; 2317 static int nchanges; 2318 2319 static struct kevent * 2320 allocevchange(void) 2321 { 2322 2323 if (nchanges == A_CNT(changebuf)) { 2324 /* XXX Error handling could be improved. */ 2325 (void) wait_for_events(NULL, 0); 2326 } 2327 2328 return (&changebuf[nchanges++]); 2329 } 2330 2331 static int 2332 wait_for_events(struct kevent *events, size_t nevents) 2333 { 2334 int rv; 2335 2336 rv = kevent(fkq, nchanges ? changebuf : NULL, nchanges, 2337 events, nevents, NULL); 2338 nchanges = 0; 2339 return (rv); 2340 } 2341
Indexes created Fri Sep 26 20:09:58 GMT 2025