syslogd.c revision 1.80
1 /* $NetBSD: syslogd.c,v 1.80 2006/09/16 06:34:55 wiz 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 1.80 2006/09/16 06:34:55 wiz 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; 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 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1191 for (j = 0; j < *finet; j++) { 1192 #if 0 1193 /* 1194 * should we check AF first, or just 1195 * trial and error? FWD 1196 */ 1197 if (r->ai_family == 1198 address_family_of(finet[j+1])) 1199 #endif 1200 lsent = sendto(finet[j+1], line, l, 0, 1201 r->ai_addr, r->ai_addrlen); 1202 if (lsent == l) 1203 break; 1204 } 1205 } 1206 if (lsent != l) { 1207 f->f_type = F_UNUSED; 1208 logerror("sendto() failed"); 1209 } 1210 } 1211 break; 1212 1213 case F_PIPE: 1214 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1215 v->iov_base = "\n"; 1216 v->iov_len = 1; 1217 ADDEV(); 1218 if (f->f_un.f_pipe.f_pid == 0) { 1219 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1220 &f->f_un.f_pipe.f_pid)) < 0) { 1221 f->f_type = F_UNUSED; 1222 logerror(f->f_un.f_pipe.f_pname); 1223 break; 1224 } 1225 } 1226 if (writev(f->f_file, iov, v - iov) < 0) { 1227 int e = errno; 1228 if (f->f_un.f_pipe.f_pid > 0) { 1229 (void) close(f->f_file); 1230 deadq_enter(f->f_un.f_pipe.f_pid, 1231 f->f_un.f_pipe.f_pname); 1232 } 1233 f->f_un.f_pipe.f_pid = 0; 1234 /* 1235 * If the error was EPIPE, then what is likely 1236 * has happened is we have a command that is 1237 * designed to take a single message line and 1238 * then exit, but we tried to feed it another 1239 * one before we reaped the child and thus 1240 * reset our state. 1241 * 1242 * Well, now we've reset our state, so try opening 1243 * the pipe and sending the message again if EPIPE 1244 * was the error. 1245 */ 1246 if (e == EPIPE) { 1247 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1248 &f->f_un.f_pipe.f_pid)) < 0) { 1249 f->f_type = F_UNUSED; 1250 logerror(f->f_un.f_pipe.f_pname); 1251 break; 1252 } 1253 if (writev(f->f_file, iov, v - iov) < 0) { 1254 e = errno; 1255 if (f->f_un.f_pipe.f_pid > 0) { 1256 (void) close(f->f_file); 1257 deadq_enter(f->f_un.f_pipe.f_pid, 1258 f->f_un.f_pipe.f_pname); 1259 } 1260 f->f_un.f_pipe.f_pid = 0; 1261 } else 1262 e = 0; 1263 } 1264 if (e != 0) { 1265 errno = e; 1266 logerror(f->f_un.f_pipe.f_pname); 1267 } 1268 } 1269 break; 1270 1271 case F_CONSOLE: 1272 if (flags & IGN_CONS) { 1273 dprintf(" (ignored)\n"); 1274 break; 1275 } 1276 /* FALLTHROUGH */ 1277 1278 case F_TTY: 1279 case F_FILE: 1280 dprintf(" %s\n", f->f_un.f_fname); 1281 if (f->f_type != F_FILE) { 1282 v->iov_base = "\r\n"; 1283 v->iov_len = 2; 1284 } else { 1285 v->iov_base = "\n"; 1286 v->iov_len = 1; 1287 } 1288 ADDEV(); 1289 again: 1290 if (writev(f->f_file, iov, v - iov) < 0) { 1291 int e = errno; 1292 if (f->f_type == F_FILE && e == ENOSPC) { 1293 int lasterror = f->f_lasterror; 1294 f->f_lasterror = e; 1295 if (lasterror != e) 1296 logerror(f->f_un.f_fname); 1297 break; 1298 } 1299 (void)close(f->f_file); 1300 /* 1301 * Check for errors on TTY's due to loss of tty 1302 */ 1303 if ((e == EIO || e == EBADF) && f->f_type != F_FILE) { 1304 f->f_file = open(f->f_un.f_fname, 1305 O_WRONLY|O_APPEND, 0); 1306 if (f->f_file < 0) { 1307 f->f_type = F_UNUSED; 1308 logerror(f->f_un.f_fname); 1309 } else 1310 goto again; 1311 } else { 1312 f->f_type = F_UNUSED; 1313 errno = e; 1314 f->f_lasterror = e; 1315 logerror(f->f_un.f_fname); 1316 } 1317 } else { 1318 f->f_lasterror = 0; 1319 if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) 1320 (void)fsync(f->f_file); 1321 } 1322 break; 1323 1324 case F_USERS: 1325 case F_WALL: 1326 dprintf("\n"); 1327 v->iov_base = "\r\n"; 1328 v->iov_len = 2; 1329 ADDEV(); 1330 wallmsg(f, iov, v - iov); 1331 break; 1332 } 1333 f->f_prevcount = 0; 1334 } 1335 1336 /* 1337 * WALLMSG -- Write a message to the world at large 1338 * 1339 * Write the specified message to either the entire 1340 * world, or a list of approved users. 1341 */ 1342 void 1343 wallmsg(struct filed *f, struct iovec *iov, size_t iovcnt) 1344 { 1345 static int reenter; /* avoid calling ourselves */ 1346 int i; 1347 char *p; 1348 static struct utmpentry *ohead = NULL; 1349 struct utmpentry *ep; 1350 1351 if (reenter++) 1352 return; 1353 1354 (void)getutentries(NULL, &ep); 1355 if (ep != ohead) { 1356 freeutentries(ohead); 1357 ohead = ep; 1358 } 1359 /* NOSTRICT */ 1360 for (; ep; ep = ep->next) { 1361 if (f->f_type == F_WALL) { 1362 if ((p = ttymsg(iov, iovcnt, ep->line, TTYMSGTIME)) 1363 != NULL) { 1364 errno = 0; /* already in msg */ 1365 logerror(p); 1366 } 1367 continue; 1368 } 1369 /* should we send the message to this user? */ 1370 for (i = 0; i < MAXUNAMES; i++) { 1371 if (!f->f_un.f_uname[i][0]) 1372 break; 1373 if (strcmp(f->f_un.f_uname[i], ep->name) == 0) { 1374 if ((p = ttymsg(iov, iovcnt, ep->line, 1375 TTYMSGTIME)) != NULL) { 1376 errno = 0; /* already in msg */ 1377 logerror(p); 1378 } 1379 break; 1380 } 1381 } 1382 } 1383 reenter = 0; 1384 } 1385 1386 void 1387 reapchild(struct kevent *ev) 1388 { 1389 int status; 1390 pid_t pid; 1391 struct filed *f; 1392 1393 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) { 1394 if (!Initialized || ShuttingDown) { 1395 /* 1396 * Be silent while we are initializing or 1397 * shutting down. 1398 */ 1399 continue; 1400 } 1401 1402 if (deadq_remove(pid)) 1403 continue; 1404 1405 /* Now, look in the list of active processes. */ 1406 for (f = Files; f != NULL; f = f->f_next) { 1407 if (f->f_type == F_PIPE && 1408 f->f_un.f_pipe.f_pid == pid) { 1409 (void) close(f->f_file); 1410 f->f_un.f_pipe.f_pid = 0; 1411 log_deadchild(pid, status, 1412 f->f_un.f_pipe.f_pname); 1413 break; 1414 } 1415 } 1416 } 1417 } 1418 1419 /* 1420 * Return a printable representation of a host address. 1421 */ 1422 char * 1423 cvthname(struct sockaddr_storage *f) 1424 { 1425 int error; 1426 const int niflag = NI_DGRAM; 1427 static char host[NI_MAXHOST], ip[NI_MAXHOST]; 1428 1429 error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len, 1430 ip, sizeof ip, NULL, 0, NI_NUMERICHOST|niflag); 1431 1432 dprintf("cvthname(%s)\n", ip); 1433 1434 if (error) { 1435 dprintf("Malformed from address %s\n", gai_strerror(error)); 1436 return ("???"); 1437 } 1438 1439 if (!UseNameService) 1440 return (ip); 1441 1442 error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len, 1443 host, sizeof host, NULL, 0, niflag); 1444 if (error) { 1445 dprintf("Host name for your address (%s) unknown\n", ip); 1446 return (ip); 1447 } 1448 1449 trim_localdomain(host); 1450 1451 return (host); 1452 } 1453 1454 void 1455 trim_localdomain(char *host) 1456 { 1457 size_t hl; 1458 1459 hl = strlen(host); 1460 if (hl > 0 && host[hl - 1] == '.') 1461 host[--hl] = '\0'; 1462 1463 if (hl > LocalDomainLen && host[hl - LocalDomainLen - 1] == '.' && 1464 strcasecmp(&host[hl - LocalDomainLen], LocalDomain) == 0) 1465 host[hl - LocalDomainLen - 1] = '\0'; 1466 } 1467 1468 void 1469 domark(struct kevent *ev) 1470 { 1471 struct filed *f; 1472 dq_t q, nextq; 1473 1474 /* 1475 * XXX Should we bother to adjust for the # of times the timer 1476 * has expired (i.e. in case we miss one?). This information is 1477 * returned to us in ev->data. 1478 */ 1479 1480 now = time((time_t *)NULL); 1481 MarkSeq += TIMERINTVL; 1482 if (MarkSeq >= MarkInterval) { 1483 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 1484 MarkSeq = 0; 1485 } 1486 1487 for (f = Files; f; f = f->f_next) { 1488 if (f->f_prevcount && now >= REPEATTIME(f)) { 1489 dprintf("Flush %s: repeated %d times, %d sec.\n", 1490 TypeNames[f->f_type], f->f_prevcount, 1491 repeatinterval[f->f_repeatcount]); 1492 fprintlog(f, 0, (char *)NULL); 1493 BACKOFF(f); 1494 } 1495 } 1496 1497 /* Walk the dead queue, and see if we should signal somebody. */ 1498 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = nextq) { 1499 nextq = TAILQ_NEXT(q, dq_entries); 1500 switch (q->dq_timeout) { 1501 case 0: 1502 /* Already signalled once, try harder now. */ 1503 if (kill(q->dq_pid, SIGKILL) != 0) 1504 (void) deadq_remove(q->dq_pid); 1505 break; 1506 1507 case 1: 1508 /* 1509 * Timed out on the dead queue, send terminate 1510 * signal. Note that we leave the removal from 1511 * the dead queue to reapchild(), which will 1512 * also log the event (unless the process 1513 * didn't even really exist, in case we simply 1514 * drop it from the dead queue). 1515 */ 1516 if (kill(q->dq_pid, SIGTERM) != 0) { 1517 (void) deadq_remove(q->dq_pid); 1518 break; 1519 } 1520 /* FALLTHROUGH */ 1521 1522 default: 1523 q->dq_timeout--; 1524 } 1525 } 1526 } 1527 1528 /* 1529 * Print syslogd errors some place. 1530 */ 1531 void 1532 logerror(const char *fmt, ...) 1533 { 1534 static int logerror_running; 1535 va_list ap; 1536 char tmpbuf[BUFSIZ]; 1537 char buf[BUFSIZ]; 1538 1539 /* If there's an error while trying to log an error, give up. */ 1540 if (logerror_running) 1541 return; 1542 logerror_running = 1; 1543 1544 va_start(ap, fmt); 1545 1546 (void)vsnprintf(tmpbuf, sizeof(tmpbuf), fmt, ap); 1547 1548 va_end(ap); 1549 1550 if (errno) 1551 (void)snprintf(buf, sizeof(buf), "syslogd: %s: %s", 1552 tmpbuf, strerror(errno)); 1553 else 1554 (void)snprintf(buf, sizeof(buf), "syslogd: %s", tmpbuf); 1555 1556 if (daemonized) 1557 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1558 if (!daemonized && Debug) 1559 dprintf("%s\n", buf); 1560 if (!daemonized && !Debug) 1561 printf("%s\n", buf); 1562 1563 logerror_running = 0; 1564 } 1565 1566 void 1567 die(struct kevent *ev) 1568 { 1569 struct filed *f; 1570 char **p; 1571 1572 ShuttingDown = 1; /* Don't log SIGCHLDs. */ 1573 for (f = Files; f != NULL; f = f->f_next) { 1574 /* flush any pending output */ 1575 if (f->f_prevcount) 1576 fprintlog(f, 0, (char *)NULL); 1577 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1578 (void) close(f->f_file); 1579 f->f_un.f_pipe.f_pid = 0; 1580 } 1581 } 1582 errno = 0; 1583 if (ev != NULL) 1584 logerror("Exiting on signal %d", (int) ev->ident); 1585 else 1586 logerror("Fatal error, exiting"); 1587 for (p = LogPaths; p && *p; p++) 1588 unlink(*p); 1589 exit(0); 1590 } 1591 1592 /* 1593 * INIT -- Initialize syslogd from configuration table 1594 */ 1595 void 1596 init(struct kevent *ev) 1597 { 1598 int i; 1599 FILE *cf; 1600 struct filed *f, *next, **nextp; 1601 char *p; 1602 char cline[LINE_MAX]; 1603 char prog[NAME_MAX + 1]; 1604 char host[MAXHOSTNAMELEN]; 1605 char hostMsg[2*MAXHOSTNAMELEN + 40]; 1606 1607 dprintf("init\n"); 1608 1609 (void)strlcpy(oldLocalHostName, LocalHostName, 1610 sizeof(oldLocalHostName)); 1611 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 1612 if ((p = strchr(LocalHostName, '.')) != NULL) { 1613 *p++ = '\0'; 1614 LocalDomain = p; 1615 } else 1616 LocalDomain = ""; 1617 LocalDomainLen = strlen(LocalDomain); 1618 1619 /* 1620 * Close all open log files. 1621 */ 1622 Initialized = 0; 1623 for (f = Files; f != NULL; f = next) { 1624 /* flush any pending output */ 1625 if (f->f_prevcount) 1626 fprintlog(f, 0, (char *)NULL); 1627 1628 switch (f->f_type) { 1629 case F_FILE: 1630 case F_TTY: 1631 case F_CONSOLE: 1632 (void)close(f->f_file); 1633 break; 1634 case F_PIPE: 1635 if (f->f_un.f_pipe.f_pid > 0) { 1636 (void)close(f->f_file); 1637 deadq_enter(f->f_un.f_pipe.f_pid, 1638 f->f_un.f_pipe.f_pname); 1639 } 1640 f->f_un.f_pipe.f_pid = 0; 1641 break; 1642 case F_FORW: 1643 if (f->f_un.f_forw.f_addr) 1644 freeaddrinfo(f->f_un.f_forw.f_addr); 1645 break; 1646 } 1647 next = f->f_next; 1648 if (f->f_program != NULL) 1649 free(f->f_program); 1650 if (f->f_host != NULL) 1651 free(f->f_host); 1652 free((char *)f); 1653 } 1654 Files = NULL; 1655 nextp = &Files; 1656 1657 /* 1658 * Close all open sockets 1659 */ 1660 1661 if (finet) { 1662 for (i = 0; i < *finet; i++) { 1663 if (close(finet[i+1]) < 0) { 1664 logerror("close() failed"); 1665 die(NULL); 1666 } 1667 } 1668 } 1669 1670 /* 1671 * Reset counter of forwarding actions 1672 */ 1673 1674 NumForwards=0; 1675 1676 /* open the configuration file */ 1677 if ((cf = fopen(ConfFile, "r")) == NULL) { 1678 dprintf("Cannot open `%s'\n", ConfFile); 1679 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1680 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1681 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1682 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1683 Initialized = 1; 1684 return; 1685 } 1686 1687 /* 1688 * Foreach line in the conf table, open that file. 1689 */ 1690 f = NULL; 1691 strcpy(prog, "*"); 1692 strcpy(host, "*"); 1693 while (fgets(cline, sizeof(cline), cf) != NULL) { 1694 /* 1695 * check for end-of-section, comments, strip off trailing 1696 * spaces and newline character. #!prog is treated specially: 1697 * following lines apply only to that program. 1698 */ 1699 for (p = cline; isspace((unsigned char)*p); ++p) 1700 continue; 1701 if (*p == '\0') 1702 continue; 1703 if (*p == '#') { 1704 p++; 1705 if (*p != '!' && *p != '+' && *p != '-') 1706 continue; 1707 } 1708 if (*p == '+' || *p == '-') { 1709 host[0] = *p++; 1710 while (isspace((unsigned char)*p)) 1711 p++; 1712 if (*p == '\0' || *p == '*') { 1713 strcpy(host, "*"); 1714 continue; 1715 } 1716 if (*p == '@') 1717 p = LocalHostName; 1718 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1719 if (!isalnum((unsigned char)*p) && 1720 *p != '.' && *p != '-' && *p != ',') 1721 break; 1722 host[i] = *p++; 1723 } 1724 host[i] = '\0'; 1725 continue; 1726 } 1727 if (*p == '!') { 1728 p++; 1729 while (isspace((unsigned char)*p)) 1730 p++; 1731 if (*p == '\0' || *p == '*') { 1732 strcpy(prog, "*"); 1733 continue; 1734 } 1735 for (i = 0; i < NAME_MAX; i++) { 1736 if (!isprint((unsigned char)p[i])) 1737 break; 1738 prog[i] = p[i]; 1739 } 1740 prog[i] = '\0'; 1741 continue; 1742 } 1743 for (p = strchr(cline, '\0'); isspace((unsigned char)*--p);) 1744 continue; 1745 *++p = '\0'; 1746 f = (struct filed *)calloc(1, sizeof(*f)); 1747 *nextp = f; 1748 nextp = &f->f_next; 1749 cfline(cline, f, prog, host); 1750 } 1751 1752 /* close the configuration file */ 1753 (void)fclose(cf); 1754 1755 Initialized = 1; 1756 1757 if (Debug) { 1758 for (f = Files; f; f = f->f_next) { 1759 for (i = 0; i <= LOG_NFACILITIES; i++) 1760 if (f->f_pmask[i] == INTERNAL_NOPRI) 1761 printf("X "); 1762 else 1763 printf("%d ", f->f_pmask[i]); 1764 printf("%s: ", TypeNames[f->f_type]); 1765 switch (f->f_type) { 1766 case F_FILE: 1767 case F_TTY: 1768 case F_CONSOLE: 1769 printf("%s", f->f_un.f_fname); 1770 break; 1771 1772 case F_FORW: 1773 printf("%s", f->f_un.f_forw.f_hname); 1774 break; 1775 1776 case F_PIPE: 1777 printf("%s", f->f_un.f_pipe.f_pname); 1778 break; 1779 1780 case F_USERS: 1781 for (i = 0; 1782 i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1783 printf("%s, ", f->f_un.f_uname[i]); 1784 break; 1785 } 1786 if (f->f_program != NULL) 1787 printf(" (%s)", f->f_program); 1788 printf("\n"); 1789 } 1790 } 1791 1792 finet = socksetup(PF_UNSPEC, bindhostname); 1793 if (finet) { 1794 if (SecureMode) { 1795 for (i = 0; i < *finet; i++) { 1796 if (shutdown(finet[i+1], SHUT_RD) < 0) { 1797 logerror("shutdown() failed"); 1798 die(NULL); 1799 } 1800 } 1801 } else 1802 dprintf("Listening on inet and/or inet6 socket\n"); 1803 dprintf("Sending on inet and/or inet6 socket\n"); 1804 } 1805 1806 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1807 dprintf("syslogd: restarted\n"); 1808 /* 1809 * Log a change in hostname, but only on a restart (we detect this 1810 * by checking to see if we're passed a kevent). 1811 */ 1812 if (ev != NULL && strcmp(oldLocalHostName, LocalHostName) != 0) { 1813 (void)snprintf(hostMsg, sizeof(hostMsg), 1814 "syslogd: host name changed, \"%s\" to \"%s\"", 1815 oldLocalHostName, LocalHostName); 1816 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1817 dprintf("%s\n", hostMsg); 1818 } 1819 } 1820 1821 /* 1822 * Crack a configuration file line 1823 */ 1824 void 1825 cfline(char *line, struct filed *f, char *prog, char *host) 1826 { 1827 struct addrinfo hints, *res; 1828 int error, i, pri, syncfile; 1829 char *bp, *p, *q; 1830 char buf[MAXLINE]; 1831 1832 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1833 1834 errno = 0; /* keep strerror() stuff out of logerror messages */ 1835 1836 /* clear out file entry */ 1837 memset(f, 0, sizeof(*f)); 1838 for (i = 0; i <= LOG_NFACILITIES; i++) 1839 f->f_pmask[i] = INTERNAL_NOPRI; 1840 1841 /* 1842 * There should not be any space before the log facility. 1843 * Check this is okay, complain and fix if it is not. 1844 */ 1845 q = line; 1846 if (isblank((unsigned char)*line)) { 1847 errno = 0; 1848 logerror( 1849 "Warning: `%s' space or tab before the log facility", 1850 line); 1851 /* Fix: strip all spaces/tabs before the log facility */ 1852 while (*q++ && isblank((unsigned char)*q)) 1853 /* skip blanks */; 1854 line = q; 1855 } 1856 1857 /* 1858 * q is now at the first char of the log facility 1859 * There should be at least one tab after the log facility 1860 * Check this is okay, and complain and fix if it is not. 1861 */ 1862 q = line + strlen(line); 1863 while (!isblank((unsigned char)*q) && (q != line)) 1864 q--; 1865 if ((q == line) && strlen(line)) { 1866 /* No tabs or space in a non empty line: complain */ 1867 errno = 0; 1868 logerror( 1869 "Error: `%s' log facility or log target missing", 1870 line); 1871 return; 1872 } 1873 1874 /* save host name, if any */ 1875 if (*host == '*') 1876 f->f_host = NULL; 1877 else { 1878 f->f_host = strdup(host); 1879 trim_localdomain(f->f_host); 1880 } 1881 1882 /* save program name, if any */ 1883 if (*prog == '*') 1884 f->f_program = NULL; 1885 else 1886 f->f_program = strdup(prog); 1887 1888 /* scan through the list of selectors */ 1889 for (p = line; *p && !isblank((unsigned char)*p);) { 1890 int pri_done, pri_cmp, pri_invert; 1891 1892 /* find the end of this facility name list */ 1893 for (q = p; *q && !isblank((unsigned char)*q) && *q++ != '.'; ) 1894 continue; 1895 1896 /* get the priority comparison */ 1897 pri_cmp = 0; 1898 pri_done = 0; 1899 pri_invert = 0; 1900 if (*q == '!') { 1901 pri_invert = 1; 1902 q++; 1903 } 1904 while (! pri_done) { 1905 switch (*q) { 1906 case '<': 1907 pri_cmp = PRI_LT; 1908 q++; 1909 break; 1910 case '=': 1911 pri_cmp = PRI_EQ; 1912 q++; 1913 break; 1914 case '>': 1915 pri_cmp = PRI_GT; 1916 q++; 1917 break; 1918 default: 1919 pri_done = 1; 1920 break; 1921 } 1922 } 1923 1924 /* collect priority name */ 1925 for (bp = buf; *q && !strchr("\t ,;", *q); ) 1926 *bp++ = *q++; 1927 *bp = '\0'; 1928 1929 /* skip cruft */ 1930 while (strchr(",;", *q)) 1931 q++; 1932 1933 /* decode priority name */ 1934 if (*buf == '*') { 1935 pri = LOG_PRIMASK + 1; 1936 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1937 } else { 1938 pri = decode(buf, prioritynames); 1939 if (pri < 0) { 1940 errno = 0; 1941 logerror("Unknown priority name `%s'", buf); 1942 return; 1943 } 1944 } 1945 if (pri_cmp == 0) 1946 pri_cmp = UniquePriority ? PRI_EQ 1947 : PRI_EQ | PRI_GT; 1948 if (pri_invert) 1949 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1950 1951 /* scan facilities */ 1952 while (*p && !strchr("\t .;", *p)) { 1953 for (bp = buf; *p && !strchr("\t ,;.", *p); ) 1954 *bp++ = *p++; 1955 *bp = '\0'; 1956 if (*buf == '*') 1957 for (i = 0; i < LOG_NFACILITIES; i++) { 1958 f->f_pmask[i] = pri; 1959 f->f_pcmp[i] = pri_cmp; 1960 } 1961 else { 1962 i = decode(buf, facilitynames); 1963 if (i < 0) { 1964 errno = 0; 1965 logerror("Unknown facility name `%s'", 1966 buf); 1967 return; 1968 } 1969 f->f_pmask[i >> 3] = pri; 1970 f->f_pcmp[i >> 3] = pri_cmp; 1971 } 1972 while (*p == ',' || *p == ' ') 1973 p++; 1974 } 1975 1976 p = q; 1977 } 1978 1979 /* skip to action part */ 1980 while (isblank((unsigned char)*p)) 1981 p++; 1982 1983 if (*p == '-') { 1984 syncfile = 0; 1985 p++; 1986 } else 1987 syncfile = 1; 1988 1989 switch (*p) { 1990 case '@': 1991 (void)strlcpy(f->f_un.f_forw.f_hname, ++p, 1992 sizeof(f->f_un.f_forw.f_hname)); 1993 memset(&hints, 0, sizeof(hints)); 1994 hints.ai_family = AF_UNSPEC; 1995 hints.ai_socktype = SOCK_DGRAM; 1996 hints.ai_protocol = 0; 1997 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1998 &res); 1999 if (error) { 2000 logerror(gai_strerror(error)); 2001 break; 2002 } 2003 f->f_un.f_forw.f_addr = res; 2004 f->f_type = F_FORW; 2005 NumForwards++; 2006 break; 2007 2008 case '/': 2009 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2010 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 2011 f->f_type = F_UNUSED; 2012 logerror(p); 2013 break; 2014 } 2015 if (syncfile) 2016 f->f_flags |= FFLAG_SYNC; 2017 if (isatty(f->f_file)) 2018 f->f_type = F_TTY; 2019 else 2020 f->f_type = F_FILE; 2021 if (strcmp(p, ctty) == 0) 2022 f->f_type = F_CONSOLE; 2023 break; 2024 2025 case '|': 2026 f->f_un.f_pipe.f_pid = 0; 2027 (void) strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2028 sizeof(f->f_un.f_pipe.f_pname)); 2029 f->f_type = F_PIPE; 2030 break; 2031 2032 case '*': 2033 f->f_type = F_WALL; 2034 break; 2035 2036 default: 2037 for (i = 0; i < MAXUNAMES && *p; i++) { 2038 for (q = p; *q && *q != ','; ) 2039 q++; 2040 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 2041 if ((q - p) > UT_NAMESIZE) 2042 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 2043 else 2044 f->f_un.f_uname[i][q - p] = '\0'; 2045 while (*q == ',' || *q == ' ') 2046 q++; 2047 p = q; 2048 } 2049 f->f_type = F_USERS; 2050 break; 2051 } 2052 } 2053 2054 2055 /* 2056 * Decode a symbolic name to a numeric value 2057 */ 2058 int 2059 decode(const char *name, CODE *codetab) 2060 { 2061 CODE *c; 2062 char *p, buf[40]; 2063 2064 if (isdigit((unsigned char)*name)) 2065 return (atoi(name)); 2066 2067 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2068 if (isupper((unsigned char)*name)) 2069 *p = tolower((unsigned char)*name); 2070 else 2071 *p = *name; 2072 } 2073 *p = '\0'; 2074 for (c = codetab; c->c_name; c++) 2075 if (!strcmp(buf, c->c_name)) 2076 return (c->c_val); 2077 2078 return (-1); 2079 } 2080 2081 /* 2082 * Retrieve the size of the kernel message buffer, via sysctl. 2083 */ 2084 int 2085 getmsgbufsize(void) 2086 { 2087 int msgbufsize, mib[2]; 2088 size_t size; 2089 2090 mib[0] = CTL_KERN; 2091 mib[1] = KERN_MSGBUFSIZE; 2092 size = sizeof msgbufsize; 2093 if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) { 2094 dprintf("Couldn't get kern.msgbufsize\n"); 2095 return (0); 2096 } 2097 return (msgbufsize); 2098 } 2099 2100 int * 2101 socksetup(int af, const char *hostname) 2102 { 2103 struct addrinfo hints, *res, *r; 2104 struct kevent *ev; 2105 int error, maxs, *s, *socks; 2106 const int on = 1; 2107 2108 if(SecureMode && !NumForwards) 2109 return(NULL); 2110 2111 memset(&hints, 0, sizeof(hints)); 2112 hints.ai_flags = AI_PASSIVE; 2113 hints.ai_family = af; 2114 hints.ai_socktype = SOCK_DGRAM; 2115 error = getaddrinfo(hostname, "syslog", &hints, &res); 2116 if (error) { 2117 logerror(gai_strerror(error)); 2118 errno = 0; 2119 die(NULL); 2120 } 2121 2122 /* Count max number of sockets we may open */ 2123 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 2124 continue; 2125 socks = malloc((maxs+1) * sizeof(int)); 2126 if (!socks) { 2127 logerror("Couldn't allocate memory for sockets"); 2128 die(NULL); 2129 } 2130 2131 *socks = 0; /* num of sockets counter at start of array */ 2132 s = socks + 1; 2133 for (r = res; r; r = r->ai_next) { 2134 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2135 if (*s < 0) { 2136 logerror("socket() failed"); 2137 continue; 2138 } 2139 if (r->ai_family == AF_INET6 && setsockopt(*s, IPPROTO_IPV6, 2140 IPV6_V6ONLY, &on, sizeof(on)) < 0) { 2141 logerror("setsockopt(IPV6_V6ONLY) failed"); 2142 close(*s); 2143 continue; 2144 } 2145 2146 if (!SecureMode) { 2147 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2148 logerror("bind() failed"); 2149 close(*s); 2150 continue; 2151 } 2152 ev = allocevchange(); 2153 EV_SET(ev, *s, EVFILT_READ, EV_ADD | EV_ENABLE, 2154 0, 0, (intptr_t) dispatch_read_finet); 2155 } 2156 2157 *socks = *socks + 1; 2158 s++; 2159 } 2160 2161 if (*socks == 0) { 2162 free (socks); 2163 if(Debug) 2164 return(NULL); 2165 else 2166 die(NULL); 2167 } 2168 if (res) 2169 freeaddrinfo(res); 2170 2171 return(socks); 2172 } 2173 2174 /* 2175 * Fairly similar to popen(3), but returns an open descriptor, as opposed 2176 * to a FILE *. 2177 */ 2178 int 2179 p_open(char *prog, pid_t *rpid) 2180 { 2181 int pfd[2], nulldesc, i; 2182 pid_t pid; 2183 char *argv[4]; /* sh -c cmd NULL */ 2184 char errmsg[200]; 2185 2186 if (pipe(pfd) == -1) 2187 return (-1); 2188 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) { 2189 /* We are royally screwed anyway. */ 2190 return (-1); 2191 } 2192 2193 switch ((pid = fork())) { 2194 case -1: 2195 (void) close(nulldesc); 2196 return (-1); 2197 2198 case 0: 2199 argv[0] = "sh"; 2200 argv[1] = "-c"; 2201 argv[2] = prog; 2202 argv[3] = NULL; 2203 2204 (void) setsid(); /* avoid catching SIGHUPs. */ 2205 2206 /* 2207 * Reset ignored signals to their default behavior. 2208 */ 2209 (void)signal(SIGTERM, SIG_DFL); 2210 (void)signal(SIGINT, SIG_DFL); 2211 (void)signal(SIGQUIT, SIG_DFL); 2212 (void)signal(SIGPIPE, SIG_DFL); 2213 (void)signal(SIGHUP, SIG_DFL); 2214 2215 dup2(pfd[0], STDIN_FILENO); 2216 dup2(nulldesc, STDOUT_FILENO); 2217 dup2(nulldesc, STDERR_FILENO); 2218 for (i = getdtablesize(); i > 2; i--) 2219 (void) close(i); 2220 2221 (void) execvp(_PATH_BSHELL, argv); 2222 _exit(255); 2223 } 2224 2225 (void) close(nulldesc); 2226 (void) close(pfd[0]); 2227 2228 /* 2229 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2230 * supposed to get an EWOULDBLOCK on writev(2), which is 2231 * caught by the logic above anyway, which will in turn 2232 * close the pipe, and fork a new logging subprocess if 2233 * necessary. The stale subprocess will be killed some 2234 * time later unless it terminated itself due to closing 2235 * its input pipe. 2236 */ 2237 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2238 /* This is bad. */ 2239 (void) snprintf(errmsg, sizeof(errmsg), 2240 "Warning: cannot change pipe to pid %d to " 2241 "non-blocking.", (int) pid); 2242 logerror(errmsg); 2243 } 2244 *rpid = pid; 2245 return (pfd[1]); 2246 } 2247 2248 void 2249 deadq_enter(pid_t pid, const char *name) 2250 { 2251 dq_t p; 2252 int status; 2253 2254 /* 2255 * Be paranoid: if we can't signal the process, don't enter it 2256 * into the dead queue (perhaps it's already dead). If possible, 2257 * we try to fetch and log the child's status. 2258 */ 2259 if (kill(pid, 0) != 0) { 2260 if (waitpid(pid, &status, WNOHANG) > 0) 2261 log_deadchild(pid, status, name); 2262 return; 2263 } 2264 2265 p = malloc(sizeof(*p)); 2266 if (p == NULL) { 2267 errno = 0; 2268 logerror("panic: out of memory!"); 2269 exit(1); 2270 } 2271 2272 p->dq_pid = pid; 2273 p->dq_timeout = DQ_TIMO_INIT; 2274 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2275 } 2276 2277 int 2278 deadq_remove(pid_t pid) 2279 { 2280 dq_t q; 2281 2282 for (q = TAILQ_FIRST(&deadq_head); q != NULL; 2283 q = TAILQ_NEXT(q, dq_entries)) { 2284 if (q->dq_pid == pid) { 2285 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2286 free(q); 2287 return (1); 2288 } 2289 } 2290 return (0); 2291 } 2292 2293 void 2294 log_deadchild(pid_t pid, int status, const char *name) 2295 { 2296 int code; 2297 char buf[256]; 2298 const char *reason; 2299 2300 /* Keep strerror() struff out of logerror messages. */ 2301 errno = 0; 2302 if (WIFSIGNALED(status)) { 2303 reason = "due to signal"; 2304 code = WTERMSIG(status); 2305 } else { 2306 reason = "with status"; 2307 code = WEXITSTATUS(status); 2308 if (code == 0) 2309 return; 2310 } 2311 (void) snprintf(buf, sizeof(buf), 2312 "Logging subprocess %d (%s) exited %s %d.", 2313 pid, name, reason, code); 2314 logerror(buf); 2315 } 2316 2317 static struct kevent changebuf[8]; 2318 static int nchanges; 2319 2320 static struct kevent * 2321 allocevchange(void) 2322 { 2323 2324 if (nchanges == A_CNT(changebuf)) { 2325 /* XXX Error handling could be improved. */ 2326 (void) wait_for_events(NULL, 0); 2327 } 2328 2329 return (&changebuf[nchanges++]); 2330 } 2331 2332 static int 2333 wait_for_events(struct kevent *events, size_t nevents) 2334 { 2335 int rv; 2336 2337 rv = kevent(fkq, nchanges ? changebuf : NULL, nchanges, 2338 events, nevents, NULL); 2339 nchanges = 0; 2340 return (rv); 2341 } 2342
Indexes created Thu Sep 25 16:09:42 GMT 2025