syslogd.c revision 1.82
1 /* $NetBSD: syslogd.c,v 1.82 2006/09/16 17:05:32 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 1.82 2006/09/16 17:05:32 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] [-b bind_address] [-f config_file] [-g group]\n" 613 "\t[-m mark_interval] [-P file_list] [-p log_socket\n" 614 "\t[-p log_socket2 ...]] [-t chroot_dir] [-u user]\n", 615 getprogname()); 616 exit(1); 617 } 618 619 /* 620 * Dispatch routine for reading /dev/klog 621 */ 622 static void 623 dispatch_read_klog(struct kevent *ev) 624 { 625 ssize_t rv; 626 int fd = ev->ident; 627 628 dprintf("Kernel log active\n"); 629 630 rv = read(fd, linebuf, linebufsize - 1); 631 if (rv > 0) { 632 linebuf[rv] = '\0'; 633 printsys(linebuf); 634 } else if (rv < 0 && errno != EINTR) { 635 /* 636 * /dev/klog has croaked. Disable the event 637 * so it won't bother us again. 638 */ 639 struct kevent *cev = allocevchange(); 640 logerror("klog failed"); 641 EV_SET(cev, fd, EVFILT_READ, EV_DISABLE, 642 0, 0, (intptr_t) dispatch_read_klog); 643 } 644 } 645 646 /* 647 * Dispatch routine for reading Unix domain sockets. 648 */ 649 static void 650 dispatch_read_funix(struct kevent *ev) 651 { 652 struct sockaddr_un myname, fromunix; 653 ssize_t rv; 654 socklen_t sunlen; 655 int fd = ev->ident; 656 657 sunlen = sizeof(myname); 658 if (getsockname(fd, (struct sockaddr *)&myname, &sunlen) != 0) { 659 /* 660 * This should never happen, so ensure that it doesn't 661 * happen again. 662 */ 663 struct kevent *cev = allocevchange(); 664 logerror("getsockname() unix failed"); 665 EV_SET(cev, fd, EVFILT_READ, EV_DISABLE, 666 0, 0, (intptr_t) dispatch_read_funix); 667 return; 668 } 669 670 dprintf("Unix socket (%s) active\n", myname.sun_path); 671 672 sunlen = sizeof(fromunix); 673 rv = recvfrom(fd, linebuf, MAXLINE, 0, 674 (struct sockaddr *)&fromunix, &sunlen); 675 if (rv > 0) { 676 linebuf[rv] = '\0'; 677 printline(LocalHostName, linebuf, 0); 678 } else if (rv < 0 && errno != EINTR) { 679 logerror("recvfrom() unix `%s'", myname.sun_path); 680 } 681 } 682 683 /* 684 * Dispatch routine for reading Internet sockets. 685 */ 686 static void 687 dispatch_read_finet(struct kevent *ev) 688 { 689 #ifdef LIBWRAP 690 struct request_info req; 691 #endif 692 struct sockaddr_storage frominet; 693 ssize_t rv; 694 socklen_t len; 695 int fd = ev->ident; 696 int reject = 0; 697 698 dprintf("inet socket active\n"); 699 700 #ifdef LIBWRAP 701 request_init(&req, RQ_DAEMON, "syslogd", RQ_FILE, fd, NULL); 702 fromhost(&req); 703 reject = !hosts_access(&req); 704 if (reject) 705 dprintf("access denied\n"); 706 #endif 707 708 len = sizeof(frominet); 709 rv = recvfrom(fd, linebuf, MAXLINE, 0, 710 (struct sockaddr *)&frominet, &len); 711 if (rv == 0 || (rv < 0 && errno == EINTR)) 712 return; 713 else if (rv < 0) { 714 logerror("recvfrom inet"); 715 return; 716 } 717 718 linebuf[rv] = '\0'; 719 if (!reject) 720 printline(cvthname(&frominet), linebuf, 721 RemoteAddDate ? ADDDATE : 0); 722 } 723 724 /* 725 * given a pointer to an array of char *'s, a pointer to its current 726 * size and current allocated max size, and a new char * to add, add 727 * it, update everything as necessary, possibly allocating a new array 728 */ 729 void 730 logpath_add(char ***lp, int *szp, int *maxszp, char *new) 731 { 732 char **nlp; 733 int newmaxsz; 734 735 dprintf("Adding `%s' to the %p logpath list\n", new, *lp); 736 if (*szp == *maxszp) { 737 if (*maxszp == 0) { 738 newmaxsz = 4; /* start of with enough for now */ 739 *lp = NULL; 740 } else 741 newmaxsz = *maxszp * 2; 742 nlp = realloc(*lp, sizeof(char *) * (newmaxsz + 1)); 743 if (nlp == NULL) { 744 logerror("Couldn't allocate line buffer"); 745 die(NULL); 746 } 747 *lp = nlp; 748 *maxszp = newmaxsz; 749 } 750 if (((*lp)[(*szp)++] = strdup(new)) == NULL) { 751 logerror("Couldn't allocate logpath"); 752 die(NULL); 753 } 754 (*lp)[(*szp)] = NULL; /* always keep it NULL terminated */ 755 } 756 757 /* do a file of log sockets */ 758 void 759 logpath_fileadd(char ***lp, int *szp, int *maxszp, char *file) 760 { 761 FILE *fp; 762 char *line; 763 size_t len; 764 765 fp = fopen(file, "r"); 766 if (fp == NULL) { 767 logerror("Could not open socket file list `%s'", file); 768 die(NULL); 769 } 770 771 while ((line = fgetln(fp, &len))) { 772 line[len - 1] = 0; 773 logpath_add(lp, szp, maxszp, line); 774 } 775 fclose(fp); 776 } 777 778 /* 779 * Take a raw input line, decode the message, and print the message 780 * on the appropriate log files. 781 */ 782 void 783 printline(char *hname, char *msg, int flags) 784 { 785 int c, pri; 786 char *p, *q, line[MAXLINE + 1]; 787 long n; 788 789 /* test for special codes */ 790 pri = DEFUPRI; 791 p = msg; 792 if (*p == '<') { 793 errno = 0; 794 n = strtol(p + 1, &q, 10); 795 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 796 p = q + 1; 797 pri = (int)n; 798 } 799 } 800 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 801 pri = DEFUPRI; 802 803 /* 804 * Don't allow users to log kernel messages. 805 * NOTE: Since LOG_KERN == 0, this will also match 806 * messages with no facility specified. 807 */ 808 if ((pri & LOG_FACMASK) == LOG_KERN) 809 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 810 811 q = line; 812 813 while ((c = *p++) != '\0' && 814 q < &line[sizeof(line) - 2]) { 815 c &= 0177; 816 if (iscntrl(c)) 817 if (c == '\n') 818 *q++ = ' '; 819 else if (c == '\t') 820 *q++ = '\t'; 821 else { 822 *q++ = '^'; 823 *q++ = c ^ 0100; 824 } 825 else 826 *q++ = c; 827 } 828 *q = '\0'; 829 830 logmsg(pri, line, hname, flags); 831 } 832 833 /* 834 * Take a raw input line from /dev/klog, split and format similar to syslog(). 835 */ 836 void 837 printsys(char *msg) 838 { 839 int n, pri, flags, is_printf; 840 char *p, *q; 841 842 for (p = msg; *p != '\0'; ) { 843 flags = ISKERNEL | ADDDATE; 844 if (SyncKernel) 845 flags |= SYNC_FILE; 846 pri = DEFSPRI; 847 is_printf = 1; 848 if (*p == '<') { 849 errno = 0; 850 n = (int)strtol(p + 1, &q, 10); 851 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 852 p = q + 1; 853 pri = n; 854 is_printf = 0; 855 } 856 } 857 if (is_printf) { 858 /* kernel printf's come out on console */ 859 flags |= IGN_CONS; 860 } 861 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 862 pri = DEFSPRI; 863 for (q = p; *q != '\0' && *q != '\n'; q++) 864 /* look for end of line */; 865 if (*q != '\0') 866 *q++ = '\0'; 867 logmsg(pri, p, LocalHostName, flags); 868 p = q; 869 } 870 } 871 872 time_t now; 873 874 /* 875 * Check to see if `name' matches the provided specification, using the 876 * specified strstr function. 877 */ 878 int 879 matches_spec(const char *name, const char *spec, 880 char *(*check)(const char *, const char *)) 881 { 882 const char *s; 883 char prev, next; 884 885 if ((s = (*check)(spec, name)) != NULL) { 886 prev = s == spec ? ',' : *(s - 1); 887 next = *(s + strlen(name)); 888 889 if (prev == ',' && (next == '\0' || next == ',')) 890 return (1); 891 } 892 893 return (0); 894 } 895 896 /* 897 * Log a message to the appropriate log files, users, etc. based on 898 * the priority. 899 */ 900 void 901 logmsg(int pri, char *msg, char *from, int flags) 902 { 903 struct filed *f; 904 int fac, msglen, omask, prilev, i; 905 char *timestamp; 906 char prog[NAME_MAX + 1]; 907 char buf[MAXLINE + 1]; 908 909 dprintf("logmsg: pri 0%o, flags 0x%x, from %s, msg %s\n", 910 pri, flags, from, msg); 911 912 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 913 914 /* 915 * Check to see if msg looks non-standard. 916 */ 917 msglen = strlen(msg); 918 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 919 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 920 flags |= ADDDATE; 921 922 (void)time(&now); 923 if (flags & ADDDATE) 924 timestamp = ctime(&now) + 4; 925 else { 926 timestamp = msg; 927 msg += 16; 928 msglen -= 16; 929 } 930 931 /* skip leading whitespace */ 932 while (isspace((unsigned char)*msg)) { 933 msg++; 934 msglen--; 935 } 936 937 /* extract facility and priority level */ 938 if (flags & MARK) 939 fac = LOG_NFACILITIES; 940 else 941 fac = LOG_FAC(pri); 942 prilev = LOG_PRI(pri); 943 944 /* extract program name */ 945 for (i = 0; i < NAME_MAX; i++) { 946 if (!isprint((unsigned char)msg[i]) || 947 msg[i] == ':' || msg[i] == '[') 948 break; 949 prog[i] = msg[i]; 950 } 951 prog[i] = '\0'; 952 953 /* add kernel prefix for kernel messages */ 954 if (flags & ISKERNEL) { 955 snprintf(buf, sizeof(buf), "%s: %s", 956 _PATH_UNIX, msg); 957 msg = buf; 958 msglen = strlen(buf); 959 } 960 961 /* log the message to the particular outputs */ 962 if (!Initialized) { 963 f = &consfile; 964 f->f_file = open(ctty, O_WRONLY, 0); 965 966 if (f->f_file >= 0) { 967 (void)strncpy(f->f_lasttime, timestamp, 15); 968 fprintlog(f, flags, msg); 969 (void)close(f->f_file); 970 } 971 (void)sigsetmask(omask); 972 return; 973 } 974 for (f = Files; f; f = f->f_next) { 975 /* skip messages that are incorrect priority */ 976 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 977 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 978 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 979 ) 980 || f->f_pmask[fac] == INTERNAL_NOPRI) 981 continue; 982 983 /* skip messages with the incorrect host name */ 984 if (f->f_host != NULL) { 985 switch (f->f_host[0]) { 986 case '+': 987 if (! matches_spec(from, f->f_host + 1, 988 strcasestr)) 989 continue; 990 break; 991 case '-': 992 if (matches_spec(from, f->f_host + 1, 993 strcasestr)) 994 continue; 995 break; 996 } 997 } 998 999 /* skip messages with the incorrect program name */ 1000 if (f->f_program != NULL) { 1001 switch (f->f_program[0]) { 1002 case '+': 1003 if (! matches_spec(prog, f->f_program + 1, 1004 strstr)) 1005 continue; 1006 break; 1007 case '-': 1008 if (matches_spec(prog, f->f_program + 1, 1009 strstr)) 1010 continue; 1011 break; 1012 default: 1013 if (! matches_spec(prog, f->f_program, 1014 strstr)) 1015 continue; 1016 break; 1017 } 1018 } 1019 1020 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1021 continue; 1022 1023 /* don't output marks to recently written files */ 1024 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1025 continue; 1026 1027 /* 1028 * suppress duplicate lines to this file unless NoRepeat 1029 */ 1030 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 1031 !NoRepeat && 1032 !strcmp(msg, f->f_prevline) && 1033 !strcasecmp(from, f->f_prevhost)) { 1034 (void)strncpy(f->f_lasttime, timestamp, 15); 1035 f->f_prevcount++; 1036 dprintf("Msg repeated %d times, %ld sec of %d\n", 1037 f->f_prevcount, (long)(now - f->f_time), 1038 repeatinterval[f->f_repeatcount]); 1039 /* 1040 * If domark would have logged this by now, 1041 * flush it now (so we don't hold isolated messages), 1042 * but back off so we'll flush less often 1043 * in the future. 1044 */ 1045 if (now > REPEATTIME(f)) { 1046 fprintlog(f, flags, (char *)NULL); 1047 BACKOFF(f); 1048 } 1049 } else { 1050 /* new line, save it */ 1051 if (f->f_prevcount) 1052 fprintlog(f, 0, (char *)NULL); 1053 f->f_repeatcount = 0; 1054 f->f_prevpri = pri; 1055 (void)strncpy(f->f_lasttime, timestamp, 15); 1056 (void)strncpy(f->f_prevhost, from, 1057 sizeof(f->f_prevhost)); 1058 if (msglen < MAXSVLINE) { 1059 f->f_prevlen = msglen; 1060 (void)strlcpy(f->f_prevline, msg, 1061 sizeof(f->f_prevline)); 1062 fprintlog(f, flags, (char *)NULL); 1063 } else { 1064 f->f_prevline[0] = 0; 1065 f->f_prevlen = 0; 1066 fprintlog(f, flags, msg); 1067 } 1068 } 1069 } 1070 (void)sigsetmask(omask); 1071 } 1072 1073 void 1074 fprintlog(struct filed *f, int flags, char *msg) 1075 { 1076 struct iovec iov[10]; 1077 struct iovec *v; 1078 struct addrinfo *r; 1079 int j, l, lsent, fail, retry; 1080 char line[MAXLINE + 1], repbuf[80], greetings[200]; 1081 #define ADDEV() assert(++v - iov < A_CNT(iov)) 1082 1083 v = iov; 1084 if (f->f_type == F_WALL) { 1085 v->iov_base = greetings; 1086 v->iov_len = snprintf(greetings, sizeof greetings, 1087 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1088 f->f_prevhost, ctime(&now)); 1089 ADDEV(); 1090 v->iov_base = ""; 1091 v->iov_len = 0; 1092 ADDEV(); 1093 } else { 1094 v->iov_base = f->f_lasttime; 1095 v->iov_len = 15; 1096 ADDEV(); 1097 v->iov_base = " "; 1098 v->iov_len = 1; 1099 ADDEV(); 1100 } 1101 1102 if (LogFacPri) { 1103 static char fp_buf[30]; 1104 const char *f_s = NULL, *p_s = NULL; 1105 int fac = f->f_prevpri & LOG_FACMASK; 1106 int pri = LOG_PRI(f->f_prevpri); 1107 char f_n[5], p_n[5]; 1108 1109 if (LogFacPri > 1) { 1110 CODE *c; 1111 1112 for (c = facilitynames; c->c_name != NULL; c++) { 1113 if (c->c_val == fac) { 1114 f_s = c->c_name; 1115 break; 1116 } 1117 } 1118 for (c = prioritynames; c->c_name != NULL; c++) { 1119 if (c->c_val == pri) { 1120 p_s = c->c_name; 1121 break; 1122 } 1123 } 1124 } 1125 if (f_s == NULL) { 1126 snprintf(f_n, sizeof(f_n), "%d", LOG_FAC(fac)); 1127 f_s = f_n; 1128 } 1129 if (p_s == NULL) { 1130 snprintf(p_n, sizeof(p_n), "%d", pri); 1131 p_s = p_n; 1132 } 1133 snprintf(fp_buf, sizeof(fp_buf), "<%s.%s>", f_s, p_s); 1134 v->iov_base = fp_buf; 1135 v->iov_len = strlen(fp_buf); 1136 } else { 1137 v->iov_base = ""; 1138 v->iov_len = 0; 1139 } 1140 ADDEV(); 1141 1142 v->iov_base = f->f_prevhost; 1143 v->iov_len = strlen(v->iov_base); 1144 ADDEV(); 1145 v->iov_base = " "; 1146 v->iov_len = 1; 1147 ADDEV(); 1148 1149 if (msg) { 1150 v->iov_base = msg; 1151 v->iov_len = strlen(msg); 1152 } else if (f->f_prevcount > 1) { 1153 v->iov_base = repbuf; 1154 v->iov_len = snprintf(repbuf, sizeof repbuf, 1155 "last message repeated %d times", f->f_prevcount); 1156 } else { 1157 v->iov_base = f->f_prevline; 1158 v->iov_len = f->f_prevlen; 1159 } 1160 ADDEV(); 1161 1162 dprintf("Logging to %s", TypeNames[f->f_type]); 1163 f->f_time = now; 1164 1165 switch (f->f_type) { 1166 case F_UNUSED: 1167 dprintf("\n"); 1168 break; 1169 1170 case F_FORW: 1171 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1172 /* 1173 * check for local vs remote messages 1174 * (from FreeBSD PR#bin/7055) 1175 */ 1176 if (strcasecmp(f->f_prevhost, LocalHostName)) { 1177 l = snprintf(line, sizeof(line) - 1, 1178 "<%d>%.15s [%s]: %s", 1179 f->f_prevpri, (char *) iov[0].iov_base, 1180 f->f_prevhost, (char *) iov[5].iov_base); 1181 } else { 1182 l = snprintf(line, sizeof(line) - 1, "<%d>%.15s %s", 1183 f->f_prevpri, (char *) iov[0].iov_base, 1184 (char *) iov[5].iov_base); 1185 } 1186 if (l > MAXLINE) 1187 l = MAXLINE; 1188 if (finet) { 1189 lsent = -1; 1190 fail = 0; 1191 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1192 retry = 0; 1193 for (j = 0; j < *finet; j++) { 1194 #if 0 1195 /* 1196 * should we check AF first, or just 1197 * trial and error? FWD 1198 */ 1199 if (r->ai_family == 1200 address_family_of(finet[j+1])) 1201 #endif 1202 sendagain: 1203 lsent = sendto(finet[j+1], line, l, 0, 1204 r->ai_addr, r->ai_addrlen); 1205 if (lsent == -1) { 1206 switch (errno) { 1207 case ENOBUFS: 1208 /* wait/retry/drop */ 1209 if (++retry < 5) { 1210 usleep(1000); 1211 goto sendagain; 1212 } 1213 break; 1214 case EHOSTDOWN: 1215 case EHOSTUNREACH: 1216 case ENETDOWN: 1217 /* drop */ 1218 break; 1219 default: 1220 /* busted */ 1221 fail++; 1222 break; 1223 } 1224 } else if (lsent == l) 1225 break; 1226 } 1227 } 1228 if (lsent != l && fail) { 1229 f->f_type = F_UNUSED; 1230 logerror("sendto() failed"); 1231 } 1232 } 1233 break; 1234 1235 case F_PIPE: 1236 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1237 v->iov_base = "\n"; 1238 v->iov_len = 1; 1239 ADDEV(); 1240 if (f->f_un.f_pipe.f_pid == 0) { 1241 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1242 &f->f_un.f_pipe.f_pid)) < 0) { 1243 f->f_type = F_UNUSED; 1244 logerror(f->f_un.f_pipe.f_pname); 1245 break; 1246 } 1247 } 1248 if (writev(f->f_file, iov, v - iov) < 0) { 1249 int e = errno; 1250 if (f->f_un.f_pipe.f_pid > 0) { 1251 (void) close(f->f_file); 1252 deadq_enter(f->f_un.f_pipe.f_pid, 1253 f->f_un.f_pipe.f_pname); 1254 } 1255 f->f_un.f_pipe.f_pid = 0; 1256 /* 1257 * If the error was EPIPE, then what is likely 1258 * has happened is we have a command that is 1259 * designed to take a single message line and 1260 * then exit, but we tried to feed it another 1261 * one before we reaped the child and thus 1262 * reset our state. 1263 * 1264 * Well, now we've reset our state, so try opening 1265 * the pipe and sending the message again if EPIPE 1266 * was the error. 1267 */ 1268 if (e == EPIPE) { 1269 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1270 &f->f_un.f_pipe.f_pid)) < 0) { 1271 f->f_type = F_UNUSED; 1272 logerror(f->f_un.f_pipe.f_pname); 1273 break; 1274 } 1275 if (writev(f->f_file, iov, v - iov) < 0) { 1276 e = errno; 1277 if (f->f_un.f_pipe.f_pid > 0) { 1278 (void) close(f->f_file); 1279 deadq_enter(f->f_un.f_pipe.f_pid, 1280 f->f_un.f_pipe.f_pname); 1281 } 1282 f->f_un.f_pipe.f_pid = 0; 1283 } else 1284 e = 0; 1285 } 1286 if (e != 0) { 1287 errno = e; 1288 logerror(f->f_un.f_pipe.f_pname); 1289 } 1290 } 1291 break; 1292 1293 case F_CONSOLE: 1294 if (flags & IGN_CONS) { 1295 dprintf(" (ignored)\n"); 1296 break; 1297 } 1298 /* FALLTHROUGH */ 1299 1300 case F_TTY: 1301 case F_FILE: 1302 dprintf(" %s\n", f->f_un.f_fname); 1303 if (f->f_type != F_FILE) { 1304 v->iov_base = "\r\n"; 1305 v->iov_len = 2; 1306 } else { 1307 v->iov_base = "\n"; 1308 v->iov_len = 1; 1309 } 1310 ADDEV(); 1311 again: 1312 if (writev(f->f_file, iov, v - iov) < 0) { 1313 int e = errno; 1314 if (f->f_type == F_FILE && e == ENOSPC) { 1315 int lasterror = f->f_lasterror; 1316 f->f_lasterror = e; 1317 if (lasterror != e) 1318 logerror(f->f_un.f_fname); 1319 break; 1320 } 1321 (void)close(f->f_file); 1322 /* 1323 * Check for errors on TTY's due to loss of tty 1324 */ 1325 if ((e == EIO || e == EBADF) && f->f_type != F_FILE) { 1326 f->f_file = open(f->f_un.f_fname, 1327 O_WRONLY|O_APPEND, 0); 1328 if (f->f_file < 0) { 1329 f->f_type = F_UNUSED; 1330 logerror(f->f_un.f_fname); 1331 } else 1332 goto again; 1333 } else { 1334 f->f_type = F_UNUSED; 1335 errno = e; 1336 f->f_lasterror = e; 1337 logerror(f->f_un.f_fname); 1338 } 1339 } else { 1340 f->f_lasterror = 0; 1341 if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) 1342 (void)fsync(f->f_file); 1343 } 1344 break; 1345 1346 case F_USERS: 1347 case F_WALL: 1348 dprintf("\n"); 1349 v->iov_base = "\r\n"; 1350 v->iov_len = 2; 1351 ADDEV(); 1352 wallmsg(f, iov, v - iov); 1353 break; 1354 } 1355 f->f_prevcount = 0; 1356 } 1357 1358 /* 1359 * WALLMSG -- Write a message to the world at large 1360 * 1361 * Write the specified message to either the entire 1362 * world, or a list of approved users. 1363 */ 1364 void 1365 wallmsg(struct filed *f, struct iovec *iov, size_t iovcnt) 1366 { 1367 static int reenter; /* avoid calling ourselves */ 1368 int i; 1369 char *p; 1370 static struct utmpentry *ohead = NULL; 1371 struct utmpentry *ep; 1372 1373 if (reenter++) 1374 return; 1375 1376 (void)getutentries(NULL, &ep); 1377 if (ep != ohead) { 1378 freeutentries(ohead); 1379 ohead = ep; 1380 } 1381 /* NOSTRICT */ 1382 for (; ep; ep = ep->next) { 1383 if (f->f_type == F_WALL) { 1384 if ((p = ttymsg(iov, iovcnt, ep->line, TTYMSGTIME)) 1385 != NULL) { 1386 errno = 0; /* already in msg */ 1387 logerror(p); 1388 } 1389 continue; 1390 } 1391 /* should we send the message to this user? */ 1392 for (i = 0; i < MAXUNAMES; i++) { 1393 if (!f->f_un.f_uname[i][0]) 1394 break; 1395 if (strcmp(f->f_un.f_uname[i], ep->name) == 0) { 1396 if ((p = ttymsg(iov, iovcnt, ep->line, 1397 TTYMSGTIME)) != NULL) { 1398 errno = 0; /* already in msg */ 1399 logerror(p); 1400 } 1401 break; 1402 } 1403 } 1404 } 1405 reenter = 0; 1406 } 1407 1408 void 1409 reapchild(struct kevent *ev) 1410 { 1411 int status; 1412 pid_t pid; 1413 struct filed *f; 1414 1415 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) { 1416 if (!Initialized || ShuttingDown) { 1417 /* 1418 * Be silent while we are initializing or 1419 * shutting down. 1420 */ 1421 continue; 1422 } 1423 1424 if (deadq_remove(pid)) 1425 continue; 1426 1427 /* Now, look in the list of active processes. */ 1428 for (f = Files; f != NULL; f = f->f_next) { 1429 if (f->f_type == F_PIPE && 1430 f->f_un.f_pipe.f_pid == pid) { 1431 (void) close(f->f_file); 1432 f->f_un.f_pipe.f_pid = 0; 1433 log_deadchild(pid, status, 1434 f->f_un.f_pipe.f_pname); 1435 break; 1436 } 1437 } 1438 } 1439 } 1440 1441 /* 1442 * Return a printable representation of a host address. 1443 */ 1444 char * 1445 cvthname(struct sockaddr_storage *f) 1446 { 1447 int error; 1448 const int niflag = NI_DGRAM; 1449 static char host[NI_MAXHOST], ip[NI_MAXHOST]; 1450 1451 error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len, 1452 ip, sizeof ip, NULL, 0, NI_NUMERICHOST|niflag); 1453 1454 dprintf("cvthname(%s)\n", ip); 1455 1456 if (error) { 1457 dprintf("Malformed from address %s\n", gai_strerror(error)); 1458 return ("???"); 1459 } 1460 1461 if (!UseNameService) 1462 return (ip); 1463 1464 error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len, 1465 host, sizeof host, NULL, 0, niflag); 1466 if (error) { 1467 dprintf("Host name for your address (%s) unknown\n", ip); 1468 return (ip); 1469 } 1470 1471 trim_localdomain(host); 1472 1473 return (host); 1474 } 1475 1476 void 1477 trim_localdomain(char *host) 1478 { 1479 size_t hl; 1480 1481 hl = strlen(host); 1482 if (hl > 0 && host[hl - 1] == '.') 1483 host[--hl] = '\0'; 1484 1485 if (hl > LocalDomainLen && host[hl - LocalDomainLen - 1] == '.' && 1486 strcasecmp(&host[hl - LocalDomainLen], LocalDomain) == 0) 1487 host[hl - LocalDomainLen - 1] = '\0'; 1488 } 1489 1490 void 1491 domark(struct kevent *ev) 1492 { 1493 struct filed *f; 1494 dq_t q, nextq; 1495 1496 /* 1497 * XXX Should we bother to adjust for the # of times the timer 1498 * has expired (i.e. in case we miss one?). This information is 1499 * returned to us in ev->data. 1500 */ 1501 1502 now = time((time_t *)NULL); 1503 MarkSeq += TIMERINTVL; 1504 if (MarkSeq >= MarkInterval) { 1505 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 1506 MarkSeq = 0; 1507 } 1508 1509 for (f = Files; f; f = f->f_next) { 1510 if (f->f_prevcount && now >= REPEATTIME(f)) { 1511 dprintf("Flush %s: repeated %d times, %d sec.\n", 1512 TypeNames[f->f_type], f->f_prevcount, 1513 repeatinterval[f->f_repeatcount]); 1514 fprintlog(f, 0, (char *)NULL); 1515 BACKOFF(f); 1516 } 1517 } 1518 1519 /* Walk the dead queue, and see if we should signal somebody. */ 1520 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = nextq) { 1521 nextq = TAILQ_NEXT(q, dq_entries); 1522 switch (q->dq_timeout) { 1523 case 0: 1524 /* Already signalled once, try harder now. */ 1525 if (kill(q->dq_pid, SIGKILL) != 0) 1526 (void) deadq_remove(q->dq_pid); 1527 break; 1528 1529 case 1: 1530 /* 1531 * Timed out on the dead queue, send terminate 1532 * signal. Note that we leave the removal from 1533 * the dead queue to reapchild(), which will 1534 * also log the event (unless the process 1535 * didn't even really exist, in case we simply 1536 * drop it from the dead queue). 1537 */ 1538 if (kill(q->dq_pid, SIGTERM) != 0) { 1539 (void) deadq_remove(q->dq_pid); 1540 break; 1541 } 1542 /* FALLTHROUGH */ 1543 1544 default: 1545 q->dq_timeout--; 1546 } 1547 } 1548 } 1549 1550 /* 1551 * Print syslogd errors some place. 1552 */ 1553 void 1554 logerror(const char *fmt, ...) 1555 { 1556 static int logerror_running; 1557 va_list ap; 1558 char tmpbuf[BUFSIZ]; 1559 char buf[BUFSIZ]; 1560 1561 /* If there's an error while trying to log an error, give up. */ 1562 if (logerror_running) 1563 return; 1564 logerror_running = 1; 1565 1566 va_start(ap, fmt); 1567 1568 (void)vsnprintf(tmpbuf, sizeof(tmpbuf), fmt, ap); 1569 1570 va_end(ap); 1571 1572 if (errno) 1573 (void)snprintf(buf, sizeof(buf), "syslogd: %s: %s", 1574 tmpbuf, strerror(errno)); 1575 else 1576 (void)snprintf(buf, sizeof(buf), "syslogd: %s", tmpbuf); 1577 1578 if (daemonized) 1579 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1580 if (!daemonized && Debug) 1581 dprintf("%s\n", buf); 1582 if (!daemonized && !Debug) 1583 printf("%s\n", buf); 1584 1585 logerror_running = 0; 1586 } 1587 1588 void 1589 die(struct kevent *ev) 1590 { 1591 struct filed *f; 1592 char **p; 1593 1594 ShuttingDown = 1; /* Don't log SIGCHLDs. */ 1595 for (f = Files; f != NULL; f = f->f_next) { 1596 /* flush any pending output */ 1597 if (f->f_prevcount) 1598 fprintlog(f, 0, (char *)NULL); 1599 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1600 (void) close(f->f_file); 1601 f->f_un.f_pipe.f_pid = 0; 1602 } 1603 } 1604 errno = 0; 1605 if (ev != NULL) 1606 logerror("Exiting on signal %d", (int) ev->ident); 1607 else 1608 logerror("Fatal error, exiting"); 1609 for (p = LogPaths; p && *p; p++) 1610 unlink(*p); 1611 exit(0); 1612 } 1613 1614 /* 1615 * INIT -- Initialize syslogd from configuration table 1616 */ 1617 void 1618 init(struct kevent *ev) 1619 { 1620 size_t i; 1621 FILE *cf; 1622 struct filed *f, *next, **nextp; 1623 char *p; 1624 char cline[LINE_MAX]; 1625 char prog[NAME_MAX + 1]; 1626 char host[MAXHOSTNAMELEN]; 1627 char hostMsg[2*MAXHOSTNAMELEN + 40]; 1628 1629 dprintf("init\n"); 1630 1631 (void)strlcpy(oldLocalHostName, LocalHostName, 1632 sizeof(oldLocalHostName)); 1633 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 1634 if ((p = strchr(LocalHostName, '.')) != NULL) { 1635 *p++ = '\0'; 1636 LocalDomain = p; 1637 } else 1638 LocalDomain = ""; 1639 LocalDomainLen = strlen(LocalDomain); 1640 1641 /* 1642 * Close all open log files. 1643 */ 1644 Initialized = 0; 1645 for (f = Files; f != NULL; f = next) { 1646 /* flush any pending output */ 1647 if (f->f_prevcount) 1648 fprintlog(f, 0, (char *)NULL); 1649 1650 switch (f->f_type) { 1651 case F_FILE: 1652 case F_TTY: 1653 case F_CONSOLE: 1654 (void)close(f->f_file); 1655 break; 1656 case F_PIPE: 1657 if (f->f_un.f_pipe.f_pid > 0) { 1658 (void)close(f->f_file); 1659 deadq_enter(f->f_un.f_pipe.f_pid, 1660 f->f_un.f_pipe.f_pname); 1661 } 1662 f->f_un.f_pipe.f_pid = 0; 1663 break; 1664 case F_FORW: 1665 if (f->f_un.f_forw.f_addr) 1666 freeaddrinfo(f->f_un.f_forw.f_addr); 1667 break; 1668 } 1669 next = f->f_next; 1670 if (f->f_program != NULL) 1671 free(f->f_program); 1672 if (f->f_host != NULL) 1673 free(f->f_host); 1674 free((char *)f); 1675 } 1676 Files = NULL; 1677 nextp = &Files; 1678 1679 /* 1680 * Close all open sockets 1681 */ 1682 1683 if (finet) { 1684 for (i = 0; i < *finet; i++) { 1685 if (close(finet[i+1]) < 0) { 1686 logerror("close() failed"); 1687 die(NULL); 1688 } 1689 } 1690 } 1691 1692 /* 1693 * Reset counter of forwarding actions 1694 */ 1695 1696 NumForwards=0; 1697 1698 /* open the configuration file */ 1699 if ((cf = fopen(ConfFile, "r")) == NULL) { 1700 dprintf("Cannot open `%s'\n", ConfFile); 1701 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1702 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1703 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1704 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1705 Initialized = 1; 1706 return; 1707 } 1708 1709 /* 1710 * Foreach line in the conf table, open that file. 1711 */ 1712 f = NULL; 1713 strcpy(prog, "*"); 1714 strcpy(host, "*"); 1715 while (fgets(cline, sizeof(cline), cf) != NULL) { 1716 /* 1717 * check for end-of-section, comments, strip off trailing 1718 * spaces and newline character. #!prog is treated specially: 1719 * following lines apply only to that program. 1720 */ 1721 for (p = cline; isspace((unsigned char)*p); ++p) 1722 continue; 1723 if (*p == '\0') 1724 continue; 1725 if (*p == '#') { 1726 p++; 1727 if (*p != '!' && *p != '+' && *p != '-') 1728 continue; 1729 } 1730 if (*p == '+' || *p == '-') { 1731 host[0] = *p++; 1732 while (isspace((unsigned char)*p)) 1733 p++; 1734 if (*p == '\0' || *p == '*') { 1735 strcpy(host, "*"); 1736 continue; 1737 } 1738 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1739 if (*p == '@') { 1740 (void)strncpy(&host[i], LocalHostName, 1741 sizeof(host) - 1 - i); 1742 host[sizeof(host) - 1] = '\0'; 1743 i = strlen(host) - 1; 1744 p++; 1745 continue; 1746 } 1747 if (!isalnum((unsigned char)*p) && 1748 *p != '.' && *p != '-' && *p != ',') 1749 break; 1750 host[i] = *p++; 1751 } 1752 host[i] = '\0'; 1753 continue; 1754 } 1755 if (*p == '!') { 1756 p++; 1757 while (isspace((unsigned char)*p)) 1758 p++; 1759 if (*p == '\0' || *p == '*') { 1760 strcpy(prog, "*"); 1761 continue; 1762 } 1763 for (i = 0; i < NAME_MAX; i++) { 1764 if (!isprint((unsigned char)p[i])) 1765 break; 1766 prog[i] = p[i]; 1767 } 1768 prog[i] = '\0'; 1769 continue; 1770 } 1771 for (p = strchr(cline, '\0'); isspace((unsigned char)*--p);) 1772 continue; 1773 *++p = '\0'; 1774 f = (struct filed *)calloc(1, sizeof(*f)); 1775 *nextp = f; 1776 nextp = &f->f_next; 1777 cfline(cline, f, prog, host); 1778 } 1779 1780 /* close the configuration file */ 1781 (void)fclose(cf); 1782 1783 Initialized = 1; 1784 1785 if (Debug) { 1786 for (f = Files; f; f = f->f_next) { 1787 for (i = 0; i <= LOG_NFACILITIES; i++) 1788 if (f->f_pmask[i] == INTERNAL_NOPRI) 1789 printf("X "); 1790 else 1791 printf("%d ", f->f_pmask[i]); 1792 printf("%s: ", TypeNames[f->f_type]); 1793 switch (f->f_type) { 1794 case F_FILE: 1795 case F_TTY: 1796 case F_CONSOLE: 1797 printf("%s", f->f_un.f_fname); 1798 break; 1799 1800 case F_FORW: 1801 printf("%s", f->f_un.f_forw.f_hname); 1802 break; 1803 1804 case F_PIPE: 1805 printf("%s", f->f_un.f_pipe.f_pname); 1806 break; 1807 1808 case F_USERS: 1809 for (i = 0; 1810 i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1811 printf("%s, ", f->f_un.f_uname[i]); 1812 break; 1813 } 1814 if (f->f_program != NULL) 1815 printf(" (%s)", f->f_program); 1816 printf("\n"); 1817 } 1818 } 1819 1820 finet = socksetup(PF_UNSPEC, bindhostname); 1821 if (finet) { 1822 if (SecureMode) { 1823 for (i = 0; i < *finet; i++) { 1824 if (shutdown(finet[i+1], SHUT_RD) < 0) { 1825 logerror("shutdown() failed"); 1826 die(NULL); 1827 } 1828 } 1829 } else 1830 dprintf("Listening on inet and/or inet6 socket\n"); 1831 dprintf("Sending on inet and/or inet6 socket\n"); 1832 } 1833 1834 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1835 dprintf("syslogd: restarted\n"); 1836 /* 1837 * Log a change in hostname, but only on a restart (we detect this 1838 * by checking to see if we're passed a kevent). 1839 */ 1840 if (ev != NULL && strcmp(oldLocalHostName, LocalHostName) != 0) { 1841 (void)snprintf(hostMsg, sizeof(hostMsg), 1842 "syslogd: host name changed, \"%s\" to \"%s\"", 1843 oldLocalHostName, LocalHostName); 1844 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1845 dprintf("%s\n", hostMsg); 1846 } 1847 } 1848 1849 /* 1850 * Crack a configuration file line 1851 */ 1852 void 1853 cfline(char *line, struct filed *f, char *prog, char *host) 1854 { 1855 struct addrinfo hints, *res; 1856 int error, i, pri, syncfile; 1857 char *bp, *p, *q; 1858 char buf[MAXLINE]; 1859 1860 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1861 1862 errno = 0; /* keep strerror() stuff out of logerror messages */ 1863 1864 /* clear out file entry */ 1865 memset(f, 0, sizeof(*f)); 1866 for (i = 0; i <= LOG_NFACILITIES; i++) 1867 f->f_pmask[i] = INTERNAL_NOPRI; 1868 1869 /* 1870 * There should not be any space before the log facility. 1871 * Check this is okay, complain and fix if it is not. 1872 */ 1873 q = line; 1874 if (isblank((unsigned char)*line)) { 1875 errno = 0; 1876 logerror( 1877 "Warning: `%s' space or tab before the log facility", 1878 line); 1879 /* Fix: strip all spaces/tabs before the log facility */ 1880 while (*q++ && isblank((unsigned char)*q)) 1881 /* skip blanks */; 1882 line = q; 1883 } 1884 1885 /* 1886 * q is now at the first char of the log facility 1887 * There should be at least one tab after the log facility 1888 * Check this is okay, and complain and fix if it is not. 1889 */ 1890 q = line + strlen(line); 1891 while (!isblank((unsigned char)*q) && (q != line)) 1892 q--; 1893 if ((q == line) && strlen(line)) { 1894 /* No tabs or space in a non empty line: complain */ 1895 errno = 0; 1896 logerror( 1897 "Error: `%s' log facility or log target missing", 1898 line); 1899 return; 1900 } 1901 1902 /* save host name, if any */ 1903 if (*host == '*') 1904 f->f_host = NULL; 1905 else { 1906 f->f_host = strdup(host); 1907 trim_localdomain(f->f_host); 1908 } 1909 1910 /* save program name, if any */ 1911 if (*prog == '*') 1912 f->f_program = NULL; 1913 else 1914 f->f_program = strdup(prog); 1915 1916 /* scan through the list of selectors */ 1917 for (p = line; *p && !isblank((unsigned char)*p);) { 1918 int pri_done, pri_cmp, pri_invert; 1919 1920 /* find the end of this facility name list */ 1921 for (q = p; *q && !isblank((unsigned char)*q) && *q++ != '.'; ) 1922 continue; 1923 1924 /* get the priority comparison */ 1925 pri_cmp = 0; 1926 pri_done = 0; 1927 pri_invert = 0; 1928 if (*q == '!') { 1929 pri_invert = 1; 1930 q++; 1931 } 1932 while (! pri_done) { 1933 switch (*q) { 1934 case '<': 1935 pri_cmp = PRI_LT; 1936 q++; 1937 break; 1938 case '=': 1939 pri_cmp = PRI_EQ; 1940 q++; 1941 break; 1942 case '>': 1943 pri_cmp = PRI_GT; 1944 q++; 1945 break; 1946 default: 1947 pri_done = 1; 1948 break; 1949 } 1950 } 1951 1952 /* collect priority name */ 1953 for (bp = buf; *q && !strchr("\t ,;", *q); ) 1954 *bp++ = *q++; 1955 *bp = '\0'; 1956 1957 /* skip cruft */ 1958 while (strchr(",;", *q)) 1959 q++; 1960 1961 /* decode priority name */ 1962 if (*buf == '*') { 1963 pri = LOG_PRIMASK + 1; 1964 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1965 } else { 1966 pri = decode(buf, prioritynames); 1967 if (pri < 0) { 1968 errno = 0; 1969 logerror("Unknown priority name `%s'", buf); 1970 return; 1971 } 1972 } 1973 if (pri_cmp == 0) 1974 pri_cmp = UniquePriority ? PRI_EQ 1975 : PRI_EQ | PRI_GT; 1976 if (pri_invert) 1977 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1978 1979 /* scan facilities */ 1980 while (*p && !strchr("\t .;", *p)) { 1981 for (bp = buf; *p && !strchr("\t ,;.", *p); ) 1982 *bp++ = *p++; 1983 *bp = '\0'; 1984 if (*buf == '*') 1985 for (i = 0; i < LOG_NFACILITIES; i++) { 1986 f->f_pmask[i] = pri; 1987 f->f_pcmp[i] = pri_cmp; 1988 } 1989 else { 1990 i = decode(buf, facilitynames); 1991 if (i < 0) { 1992 errno = 0; 1993 logerror("Unknown facility name `%s'", 1994 buf); 1995 return; 1996 } 1997 f->f_pmask[i >> 3] = pri; 1998 f->f_pcmp[i >> 3] = pri_cmp; 1999 } 2000 while (*p == ',' || *p == ' ') 2001 p++; 2002 } 2003 2004 p = q; 2005 } 2006 2007 /* skip to action part */ 2008 while (isblank((unsigned char)*p)) 2009 p++; 2010 2011 if (*p == '-') { 2012 syncfile = 0; 2013 p++; 2014 } else 2015 syncfile = 1; 2016 2017 switch (*p) { 2018 case '@': 2019 (void)strlcpy(f->f_un.f_forw.f_hname, ++p, 2020 sizeof(f->f_un.f_forw.f_hname)); 2021 memset(&hints, 0, sizeof(hints)); 2022 hints.ai_family = AF_UNSPEC; 2023 hints.ai_socktype = SOCK_DGRAM; 2024 hints.ai_protocol = 0; 2025 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 2026 &res); 2027 if (error) { 2028 logerror(gai_strerror(error)); 2029 break; 2030 } 2031 f->f_un.f_forw.f_addr = res; 2032 f->f_type = F_FORW; 2033 NumForwards++; 2034 break; 2035 2036 case '/': 2037 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2038 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 2039 f->f_type = F_UNUSED; 2040 logerror(p); 2041 break; 2042 } 2043 if (syncfile) 2044 f->f_flags |= FFLAG_SYNC; 2045 if (isatty(f->f_file)) 2046 f->f_type = F_TTY; 2047 else 2048 f->f_type = F_FILE; 2049 if (strcmp(p, ctty) == 0) 2050 f->f_type = F_CONSOLE; 2051 break; 2052 2053 case '|': 2054 f->f_un.f_pipe.f_pid = 0; 2055 (void) strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2056 sizeof(f->f_un.f_pipe.f_pname)); 2057 f->f_type = F_PIPE; 2058 break; 2059 2060 case '*': 2061 f->f_type = F_WALL; 2062 break; 2063 2064 default: 2065 for (i = 0; i < MAXUNAMES && *p; i++) { 2066 for (q = p; *q && *q != ','; ) 2067 q++; 2068 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 2069 if ((q - p) > UT_NAMESIZE) 2070 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 2071 else 2072 f->f_un.f_uname[i][q - p] = '\0'; 2073 while (*q == ',' || *q == ' ') 2074 q++; 2075 p = q; 2076 } 2077 f->f_type = F_USERS; 2078 break; 2079 } 2080 } 2081 2082 2083 /* 2084 * Decode a symbolic name to a numeric value 2085 */ 2086 int 2087 decode(const char *name, CODE *codetab) 2088 { 2089 CODE *c; 2090 char *p, buf[40]; 2091 2092 if (isdigit((unsigned char)*name)) 2093 return (atoi(name)); 2094 2095 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2096 if (isupper((unsigned char)*name)) 2097 *p = tolower((unsigned char)*name); 2098 else 2099 *p = *name; 2100 } 2101 *p = '\0'; 2102 for (c = codetab; c->c_name; c++) 2103 if (!strcmp(buf, c->c_name)) 2104 return (c->c_val); 2105 2106 return (-1); 2107 } 2108 2109 /* 2110 * Retrieve the size of the kernel message buffer, via sysctl. 2111 */ 2112 int 2113 getmsgbufsize(void) 2114 { 2115 int msgbufsize, mib[2]; 2116 size_t size; 2117 2118 mib[0] = CTL_KERN; 2119 mib[1] = KERN_MSGBUFSIZE; 2120 size = sizeof msgbufsize; 2121 if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) { 2122 dprintf("Couldn't get kern.msgbufsize\n"); 2123 return (0); 2124 } 2125 return (msgbufsize); 2126 } 2127 2128 int * 2129 socksetup(int af, const char *hostname) 2130 { 2131 struct addrinfo hints, *res, *r; 2132 struct kevent *ev; 2133 int error, maxs, *s, *socks; 2134 const int on = 1; 2135 2136 if(SecureMode && !NumForwards) 2137 return(NULL); 2138 2139 memset(&hints, 0, sizeof(hints)); 2140 hints.ai_flags = AI_PASSIVE; 2141 hints.ai_family = af; 2142 hints.ai_socktype = SOCK_DGRAM; 2143 error = getaddrinfo(hostname, "syslog", &hints, &res); 2144 if (error) { 2145 logerror(gai_strerror(error)); 2146 errno = 0; 2147 die(NULL); 2148 } 2149 2150 /* Count max number of sockets we may open */ 2151 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 2152 continue; 2153 socks = malloc((maxs+1) * sizeof(int)); 2154 if (!socks) { 2155 logerror("Couldn't allocate memory for sockets"); 2156 die(NULL); 2157 } 2158 2159 *socks = 0; /* num of sockets counter at start of array */ 2160 s = socks + 1; 2161 for (r = res; r; r = r->ai_next) { 2162 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2163 if (*s < 0) { 2164 logerror("socket() failed"); 2165 continue; 2166 } 2167 if (r->ai_family == AF_INET6 && setsockopt(*s, IPPROTO_IPV6, 2168 IPV6_V6ONLY, &on, sizeof(on)) < 0) { 2169 logerror("setsockopt(IPV6_V6ONLY) failed"); 2170 close(*s); 2171 continue; 2172 } 2173 2174 if (!SecureMode) { 2175 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2176 logerror("bind() failed"); 2177 close(*s); 2178 continue; 2179 } 2180 ev = allocevchange(); 2181 EV_SET(ev, *s, EVFILT_READ, EV_ADD | EV_ENABLE, 2182 0, 0, (intptr_t) dispatch_read_finet); 2183 } 2184 2185 *socks = *socks + 1; 2186 s++; 2187 } 2188 2189 if (*socks == 0) { 2190 free (socks); 2191 if(Debug) 2192 return(NULL); 2193 else 2194 die(NULL); 2195 } 2196 if (res) 2197 freeaddrinfo(res); 2198 2199 return(socks); 2200 } 2201 2202 /* 2203 * Fairly similar to popen(3), but returns an open descriptor, as opposed 2204 * to a FILE *. 2205 */ 2206 int 2207 p_open(char *prog, pid_t *rpid) 2208 { 2209 int pfd[2], nulldesc, i; 2210 pid_t pid; 2211 char *argv[4]; /* sh -c cmd NULL */ 2212 char errmsg[200]; 2213 2214 if (pipe(pfd) == -1) 2215 return (-1); 2216 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) { 2217 /* We are royally screwed anyway. */ 2218 return (-1); 2219 } 2220 2221 switch ((pid = fork())) { 2222 case -1: 2223 (void) close(nulldesc); 2224 return (-1); 2225 2226 case 0: 2227 argv[0] = "sh"; 2228 argv[1] = "-c"; 2229 argv[2] = prog; 2230 argv[3] = NULL; 2231 2232 (void) setsid(); /* avoid catching SIGHUPs. */ 2233 2234 /* 2235 * Reset ignored signals to their default behavior. 2236 */ 2237 (void)signal(SIGTERM, SIG_DFL); 2238 (void)signal(SIGINT, SIG_DFL); 2239 (void)signal(SIGQUIT, SIG_DFL); 2240 (void)signal(SIGPIPE, SIG_DFL); 2241 (void)signal(SIGHUP, SIG_DFL); 2242 2243 dup2(pfd[0], STDIN_FILENO); 2244 dup2(nulldesc, STDOUT_FILENO); 2245 dup2(nulldesc, STDERR_FILENO); 2246 for (i = getdtablesize(); i > 2; i--) 2247 (void) close(i); 2248 2249 (void) execvp(_PATH_BSHELL, argv); 2250 _exit(255); 2251 } 2252 2253 (void) close(nulldesc); 2254 (void) close(pfd[0]); 2255 2256 /* 2257 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2258 * supposed to get an EWOULDBLOCK on writev(2), which is 2259 * caught by the logic above anyway, which will in turn 2260 * close the pipe, and fork a new logging subprocess if 2261 * necessary. The stale subprocess will be killed some 2262 * time later unless it terminated itself due to closing 2263 * its input pipe. 2264 */ 2265 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2266 /* This is bad. */ 2267 (void) snprintf(errmsg, sizeof(errmsg), 2268 "Warning: cannot change pipe to pid %d to " 2269 "non-blocking.", (int) pid); 2270 logerror(errmsg); 2271 } 2272 *rpid = pid; 2273 return (pfd[1]); 2274 } 2275 2276 void 2277 deadq_enter(pid_t pid, const char *name) 2278 { 2279 dq_t p; 2280 int status; 2281 2282 /* 2283 * Be paranoid: if we can't signal the process, don't enter it 2284 * into the dead queue (perhaps it's already dead). If possible, 2285 * we try to fetch and log the child's status. 2286 */ 2287 if (kill(pid, 0) != 0) { 2288 if (waitpid(pid, &status, WNOHANG) > 0) 2289 log_deadchild(pid, status, name); 2290 return; 2291 } 2292 2293 p = malloc(sizeof(*p)); 2294 if (p == NULL) { 2295 errno = 0; 2296 logerror("panic: out of memory!"); 2297 exit(1); 2298 } 2299 2300 p->dq_pid = pid; 2301 p->dq_timeout = DQ_TIMO_INIT; 2302 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2303 } 2304 2305 int 2306 deadq_remove(pid_t pid) 2307 { 2308 dq_t q; 2309 2310 for (q = TAILQ_FIRST(&deadq_head); q != NULL; 2311 q = TAILQ_NEXT(q, dq_entries)) { 2312 if (q->dq_pid == pid) { 2313 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2314 free(q); 2315 return (1); 2316 } 2317 } 2318 return (0); 2319 } 2320 2321 void 2322 log_deadchild(pid_t pid, int status, const char *name) 2323 { 2324 int code; 2325 char buf[256]; 2326 const char *reason; 2327 2328 /* Keep strerror() struff out of logerror messages. */ 2329 errno = 0; 2330 if (WIFSIGNALED(status)) { 2331 reason = "due to signal"; 2332 code = WTERMSIG(status); 2333 } else { 2334 reason = "with status"; 2335 code = WEXITSTATUS(status); 2336 if (code == 0) 2337 return; 2338 } 2339 (void) snprintf(buf, sizeof(buf), 2340 "Logging subprocess %d (%s) exited %s %d.", 2341 pid, name, reason, code); 2342 logerror(buf); 2343 } 2344 2345 static struct kevent changebuf[8]; 2346 static int nchanges; 2347 2348 static struct kevent * 2349 allocevchange(void) 2350 { 2351 2352 if (nchanges == A_CNT(changebuf)) { 2353 /* XXX Error handling could be improved. */ 2354 (void) wait_for_events(NULL, 0); 2355 } 2356 2357 return (&changebuf[nchanges++]); 2358 } 2359 2360 static int 2361 wait_for_events(struct kevent *events, size_t nevents) 2362 { 2363 int rv; 2364 2365 rv = kevent(fkq, nchanges ? changebuf : NULL, nchanges, 2366 events, nevents, NULL); 2367 nchanges = 0; 2368 return (rv); 2369 } 2370
Indexes created Thu Sep 25 16:09:42 GMT 2025