1 /* 2 * Copyright (c) 1983, 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 39 #endif 40 #endif /* not lint */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 /* 46 * syslogd -- log system messages 47 * 48 * This program implements a system log. It takes a series of lines. 49 * Each line may have a priority, signified as "<n>" as 50 * the first characters of the line. If this is 51 * not present, a default priority is used. 52 * 53 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 54 * cause it to reread its configuration file. 55 * 56 * Defined Constants: 57 * 58 * MAXLINE -- the maximum line length that can be handled. 59 * DEFUPRI -- the default priority for user messages 60 * DEFSPRI -- the default priority for kernel messages 61 * 62 * Author: Eric Allman 63 * extensive changes by Ralph Campbell 64 * more extensive changes by Eric Allman (again) 65 * Extension to log by program name as well as facility and priority 66 * by Peter da Silva. 67 * -u and -v by Harlan Stenn. 68 * Priority comparison code by Harlan Stenn. 69 */ 70 71 #define MAXLINE 1024 /* maximum line length */ 72 #define MAXSVLINE 120 /* maximum saved line length */ 73 #define DEFUPRI (LOG_USER|LOG_NOTICE) 74 #define DEFSPRI (LOG_KERN|LOG_CRIT) 75 #define TIMERINTVL 30 /* interval for checking flush, mark */ 76 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 77 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 78 79 #include <sys/param.h> 80 #include <sys/ioctl.h> 81 #include <sys/mman.h> 82 #include <sys/stat.h> 83 #include <sys/wait.h> 84 #include <sys/socket.h> 85 #include <sys/queue.h> 86 #include <sys/uio.h> 87 #include <sys/un.h> 88 #include <sys/time.h> 89 #include <sys/resource.h> 90 #include <sys/syslimits.h> 91 #include <sys/types.h> 92 93 #include <netinet/in.h> 94 #include <netdb.h> 95 #include <arpa/inet.h> 96 97 #include <ctype.h> 98 #include <err.h> 99 #include <errno.h> 100 #include <fcntl.h> 101 #include <libutil.h> 102 #include <limits.h> 103 #include <paths.h> 104 #include <signal.h> 105 #include <stdio.h> 106 #include <stdlib.h> 107 #include <string.h> 108 #include <sysexits.h> 109 #include <unistd.h> 110 #include <utmpx.h> 111 112 #include "pathnames.h" 113 #include "ttymsg.h" 114 115 #define SYSLOG_NAMES 116 #include <sys/syslog.h> 117 118 const char *ConfFile = _PATH_LOGCONF; 119 const char *PidFile = _PATH_LOGPID; 120 const char ctty[] = _PATH_CONSOLE; 121 122 #define dprintf if (Debug) printf 123 124 #define MAXUNAMES 20 /* maximum number of user names */ 125 126 /* 127 * List of hosts for binding. 128 */ 129 static STAILQ_HEAD(, host) hqueue; 130 struct host { 131 char *name; 132 STAILQ_ENTRY(host) next; 133 }; 134 135 /* 136 * Unix sockets. 137 * We have two default sockets, one with 666 permissions, 138 * and one for privileged programs. 139 */ 140 struct funix { 141 int s; 142 const char *name; 143 mode_t mode; 144 STAILQ_ENTRY(funix) next; 145 }; 146 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 147 { NULL } }; 148 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 149 { &funix_secure } }; 150 151 STAILQ_HEAD(, funix) funixes = { &funix_default, 152 &(funix_secure.next.stqe_next) }; 153 154 /* 155 * Flags to logmsg(). 156 */ 157 158 #define IGN_CONS 0x001 /* don't print on console */ 159 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 160 #define ADDDATE 0x004 /* add a date to the message */ 161 #define MARK 0x008 /* this message is a mark */ 162 #define ISKERNEL 0x010 /* kernel generated message */ 163 164 /* 165 * This structure represents the files that will have log 166 * copies printed. 167 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 168 * or if f_type if F_PIPE and f_pid > 0. 169 */ 170 171 struct filed { 172 struct filed *f_next; /* next in linked list */ 173 short f_type; /* entry type, see below */ 174 short f_file; /* file descriptor */ 175 time_t f_time; /* time this was last written */ 176 char *f_host; /* host from which to recd. */ 177 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 178 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 179 #define PRI_LT 0x1 180 #define PRI_EQ 0x2 181 #define PRI_GT 0x4 182 char *f_program; /* program this applies to */ 183 union { 184 char f_uname[MAXUNAMES][MAXLOGNAME]; 185 struct { 186 char f_hname[MAXHOSTNAMELEN]; 187 struct addrinfo *f_addr; 188 189 } f_forw; /* forwarding address */ 190 char f_fname[MAXPATHLEN]; 191 struct { 192 char f_pname[MAXPATHLEN]; 193 pid_t f_pid; 194 } f_pipe; 195 } f_un; 196 char f_prevline[MAXSVLINE]; /* last message logged */ 197 char f_lasttime[16]; /* time of last occurrence */ 198 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 199 int f_prevpri; /* pri of f_prevline */ 200 int f_prevlen; /* length of f_prevline */ 201 int f_prevcount; /* repetition cnt of prevline */ 202 u_int f_repeatcount; /* number of "repeated" msgs */ 203 int f_flags; /* file-specific flags */ 204 #define FFLAG_SYNC 0x01 205 #define FFLAG_NEEDSYNC 0x02 206 }; 207 208 /* 209 * Queue of about-to-be dead processes we should watch out for. 210 */ 211 212 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 213 struct stailhead *deadq_headp; 214 215 struct deadq_entry { 216 pid_t dq_pid; 217 int dq_timeout; 218 TAILQ_ENTRY(deadq_entry) dq_entries; 219 }; 220 221 /* 222 * The timeout to apply to processes waiting on the dead queue. Unit 223 * of measure is `mark intervals', i.e. 20 minutes by default. 224 * Processes on the dead queue will be terminated after that time. 225 */ 226 227 #define DQ_TIMO_INIT 2 228 229 typedef struct deadq_entry *dq_t; 230 231 232 /* 233 * Struct to hold records of network addresses that are allowed to log 234 * to us. 235 */ 236 struct allowedpeer { 237 int isnumeric; 238 u_short port; 239 union { 240 struct { 241 struct sockaddr_storage addr; 242 struct sockaddr_storage mask; 243 } numeric; 244 char *name; 245 } u; 246 #define a_addr u.numeric.addr 247 #define a_mask u.numeric.mask 248 #define a_name u.name 249 }; 250 251 252 /* 253 * Intervals at which we flush out "message repeated" messages, 254 * in seconds after previous message is logged. After each flush, 255 * we move to the next interval until we reach the largest. 256 */ 257 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 258 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 259 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 260 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 261 (f)->f_repeatcount = MAXREPEAT; \ 262 } 263 264 /* values for f_type */ 265 #define F_UNUSED 0 /* unused entry */ 266 #define F_FILE 1 /* regular file */ 267 #define F_TTY 2 /* terminal */ 268 #define F_CONSOLE 3 /* console terminal */ 269 #define F_FORW 4 /* remote machine */ 270 #define F_USERS 5 /* list of users */ 271 #define F_WALL 6 /* everyone logged on */ 272 #define F_PIPE 7 /* pipe to program */ 273 274 const char *TypeNames[8] = { 275 "UNUSED", "FILE", "TTY", "CONSOLE", 276 "FORW", "USERS", "WALL", "PIPE" 277 }; 278 279 static struct filed *Files; /* Log files that we write to */ 280 static struct filed consfile; /* Console */ 281 282 static int Debug; /* debug flag */ 283 static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 284 static int resolve = 1; /* resolve hostname */ 285 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 286 static const char *LocalDomain; /* our local domain name */ 287 static int *finet; /* Internet datagram sockets */ 288 static int fklog = -1; /* /dev/klog */ 289 static int Initialized; /* set when we have initialized ourselves */ 290 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 291 static int MarkSeq; /* mark sequence number */ 292 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 293 static int SecureMode; /* when true, receive only unix domain socks */ 294 #ifdef INET6 295 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 296 #else 297 static int family = PF_INET; /* protocol family (IPv4 only) */ 298 #endif 299 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 300 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 301 static int use_bootfile; /* log entire bootfile for every kern msg */ 302 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 303 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 304 305 static char bootfile[MAXLINE+1]; /* booted kernel file */ 306 307 struct allowedpeer *AllowedPeers; /* List of allowed peers */ 308 static int NumAllowed; /* Number of entries in AllowedPeers */ 309 static int RemoteAddDate; /* Always set the date on remote messages */ 310 311 static int UniquePriority; /* Only log specified priority? */ 312 static int LogFacPri; /* Put facility and priority in log message: */ 313 /* 0=no, 1=numeric, 2=names */ 314 static int KeepKernFac; /* Keep remotely logged kernel facility */ 315 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 316 static struct pidfh *pfh; 317 318 volatile sig_atomic_t MarkSet, WantDie; 319 320 static int allowaddr(char *); 321 static void cfline(const char *, struct filed *, 322 const char *, const char *); 323 static const char *cvthname(struct sockaddr *); 324 static void deadq_enter(pid_t, const char *); 325 static int deadq_remove(pid_t); 326 static int decode(const char *, const CODE *); 327 static void die(int); 328 static void dodie(int); 329 static void dofsync(void); 330 static void domark(int); 331 static void fprintlog(struct filed *, int, const char *); 332 static int *socksetup(int, char *); 333 static void init(int); 334 static void logerror(const char *); 335 static void logmsg(int, const char *, const char *, int); 336 static void log_deadchild(pid_t, int, const char *); 337 static void markit(void); 338 static int skip_message(const char *, const char *, int); 339 static void printline(const char *, char *, int); 340 static void printsys(char *); 341 static int p_open(const char *, pid_t *); 342 static void readklog(void); 343 static void reapchild(int); 344 static void usage(void); 345 static int validate(struct sockaddr *, const char *); 346 static void unmapped(struct sockaddr *); 347 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 348 static int waitdaemon(int, int, int); 349 static void timedout(int); 350 static void increase_rcvbuf(int); 351 352 int 353 main(int argc, char *argv[]) 354 { 355 int ch, i, fdsrmax = 0, l; 356 struct sockaddr_un sunx, fromunix; 357 struct sockaddr_storage frominet; 358 fd_set *fdsr = NULL; 359 char line[MAXLINE + 1]; 360 const char *hname; 361 struct timeval tv, *tvp; 362 struct sigaction sact; 363 struct host *host; 364 struct funix *fx, *fx1; 365 sigset_t mask; 366 pid_t ppid = 1, spid; 367 socklen_t len; 368 369 if (madvise(NULL, 0, MADV_PROTECT) != 0) 370 dprintf("madvise() failed: %s\n", strerror(errno)); 371 372 STAILQ_INIT(&hqueue); 373 374 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 375 != -1) 376 switch (ch) { 377 case '4': 378 family = PF_INET; 379 break; 380 #ifdef INET6 381 case '6': 382 family = PF_INET6; 383 break; 384 #endif 385 case '8': 386 mask_C1 = 0; 387 break; 388 case 'A': 389 send_to_all++; 390 break; 391 case 'a': /* allow specific network addresses only */ 392 if (allowaddr(optarg) == -1) 393 usage(); 394 break; 395 case 'b': 396 { 397 if ((host = malloc(sizeof(struct host))) == NULL) 398 err(1, "malloc failed"); 399 host->name = optarg; 400 STAILQ_INSERT_TAIL(&hqueue, host, next); 401 break; 402 } 403 case 'c': 404 no_compress++; 405 break; 406 case 'C': 407 logflags |= O_CREAT; 408 break; 409 case 'd': /* debug */ 410 Debug++; 411 break; 412 case 'f': /* configuration file */ 413 ConfFile = optarg; 414 break; 415 case 'F': /* run in foreground instead of daemon */ 416 Foreground++; 417 break; 418 case 'k': /* keep remote kern fac */ 419 KeepKernFac = 1; 420 break; 421 case 'l': 422 { 423 long perml; 424 mode_t mode; 425 char *name, *ep; 426 427 if (optarg[0] == '/') { 428 mode = DEFFILEMODE; 429 name = optarg; 430 } else if ((name = strchr(optarg, ':')) != NULL) { 431 *name++ = '\0'; 432 if (name[0] != '/') 433 errx(1, "socket name must be absolute " 434 "path"); 435 if (isdigit(*optarg)) { 436 perml = strtol(optarg, &ep, 8); 437 if (*ep || perml < 0 || 438 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 439 errx(1, "invalid mode %s, exiting", 440 optarg); 441 mode = (mode_t )perml; 442 } else 443 errx(1, "invalid mode %s, exiting", 444 optarg); 445 } else /* doesn't begin with '/', and no ':' */ 446 errx(1, "can't parse path %s", optarg); 447 448 if (strlen(name) >= sizeof(sunx.sun_path)) 449 errx(1, "%s path too long, exiting", name); 450 if ((fx = malloc(sizeof(struct funix))) == NULL) 451 err(1, "malloc failed"); 452 fx->s = -1; 453 fx->name = name; 454 fx->mode = mode; 455 STAILQ_INSERT_TAIL(&funixes, fx, next); 456 break; 457 } 458 case 'm': /* mark interval */ 459 MarkInterval = atoi(optarg) * 60; 460 break; 461 case 'N': 462 NoBind = 1; 463 SecureMode = 1; 464 break; 465 case 'n': 466 resolve = 0; 467 break; 468 case 'o': 469 use_bootfile = 1; 470 break; 471 case 'p': /* path */ 472 if (strlen(optarg) >= sizeof(sunx.sun_path)) 473 errx(1, "%s path too long, exiting", optarg); 474 funix_default.name = optarg; 475 break; 476 case 'P': /* path for alt. PID */ 477 PidFile = optarg; 478 break; 479 case 's': /* no network mode */ 480 SecureMode++; 481 break; 482 case 'S': /* path for privileged originator */ 483 if (strlen(optarg) >= sizeof(sunx.sun_path)) 484 errx(1, "%s path too long, exiting", optarg); 485 funix_secure.name = optarg; 486 break; 487 case 'T': 488 RemoteAddDate = 1; 489 break; 490 case 'u': /* only log specified priority */ 491 UniquePriority++; 492 break; 493 case 'v': /* log facility and priority */ 494 LogFacPri++; 495 break; 496 default: 497 usage(); 498 } 499 if ((argc -= optind) != 0) 500 usage(); 501 502 pfh = pidfile_open(PidFile, 0600, &spid); 503 if (pfh == NULL) { 504 if (errno == EEXIST) 505 errx(1, "syslogd already running, pid: %d", spid); 506 warn("cannot open pid file"); 507 } 508 509 if ((!Foreground) && (!Debug)) { 510 ppid = waitdaemon(0, 0, 30); 511 if (ppid < 0) { 512 warn("could not become daemon"); 513 pidfile_remove(pfh); 514 exit(1); 515 } 516 } else if (Debug) { 517 setlinebuf(stdout); 518 } 519 520 if (NumAllowed) 521 endservent(); 522 523 consfile.f_type = F_CONSOLE; 524 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 525 sizeof(consfile.f_un.f_fname)); 526 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 527 (void)signal(SIGTERM, dodie); 528 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 529 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 530 /* 531 * We don't want the SIGCHLD and SIGHUP handlers to interfere 532 * with each other; they are likely candidates for being called 533 * simultaneously (SIGHUP closes pipe descriptor, process dies, 534 * SIGCHLD happens). 535 */ 536 sigemptyset(&mask); 537 sigaddset(&mask, SIGHUP); 538 sact.sa_handler = reapchild; 539 sact.sa_mask = mask; 540 sact.sa_flags = SA_RESTART; 541 (void)sigaction(SIGCHLD, &sact, NULL); 542 (void)signal(SIGALRM, domark); 543 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 544 (void)alarm(TIMERINTVL); 545 546 TAILQ_INIT(&deadq_head); 547 548 #ifndef SUN_LEN 549 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 550 #endif 551 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 552 (void)unlink(fx->name); 553 memset(&sunx, 0, sizeof(sunx)); 554 sunx.sun_family = AF_LOCAL; 555 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 556 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 557 if (fx->s < 0 || 558 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 559 chmod(fx->name, fx->mode) < 0) { 560 (void)snprintf(line, sizeof line, 561 "cannot create %s", fx->name); 562 logerror(line); 563 dprintf("cannot create %s (%d)\n", fx->name, errno); 564 if (fx == &funix_default || fx == &funix_secure) 565 die(0); 566 else { 567 STAILQ_REMOVE(&funixes, fx, funix, next); 568 continue; 569 } 570 } 571 increase_rcvbuf(fx->s); 572 } 573 if (SecureMode <= 1) { 574 if (STAILQ_EMPTY(&hqueue)) 575 finet = socksetup(family, NULL); 576 STAILQ_FOREACH(host, &hqueue, next) { 577 int *finet0, total; 578 finet0 = socksetup(family, host->name); 579 if (finet0 && !finet) { 580 finet = finet0; 581 } else if (finet0 && finet) { 582 total = *finet0 + *finet + 1; 583 finet = realloc(finet, total * sizeof(int)); 584 if (finet == NULL) 585 err(1, "realloc failed"); 586 for (i = 1; i <= *finet0; i++) { 587 finet[(*finet)+i] = finet0[i]; 588 } 589 *finet = total - 1; 590 free(finet0); 591 } 592 } 593 } 594 595 if (finet) { 596 if (SecureMode) { 597 for (i = 0; i < *finet; i++) { 598 if (shutdown(finet[i+1], SHUT_RD) < 0 && 599 errno != ENOTCONN) { 600 logerror("shutdown"); 601 if (!Debug) 602 die(0); 603 } 604 } 605 } else { 606 dprintf("listening on inet and/or inet6 socket\n"); 607 } 608 dprintf("sending on inet and/or inet6 socket\n"); 609 } 610 611 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 612 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 613 fklog = -1; 614 if (fklog < 0) 615 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 616 617 /* tuck my process id away */ 618 pidfile_write(pfh); 619 620 dprintf("off & running....\n"); 621 622 init(0); 623 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 624 sigemptyset(&mask); 625 sigaddset(&mask, SIGCHLD); 626 sact.sa_handler = init; 627 sact.sa_mask = mask; 628 sact.sa_flags = SA_RESTART; 629 (void)sigaction(SIGHUP, &sact, NULL); 630 631 tvp = &tv; 632 tv.tv_sec = tv.tv_usec = 0; 633 634 if (fklog != -1 && fklog > fdsrmax) 635 fdsrmax = fklog; 636 if (finet && !SecureMode) { 637 for (i = 0; i < *finet; i++) { 638 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 639 fdsrmax = finet[i+1]; 640 } 641 } 642 STAILQ_FOREACH(fx, &funixes, next) 643 if (fx->s > fdsrmax) 644 fdsrmax = fx->s; 645 646 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 647 sizeof(fd_mask)); 648 if (fdsr == NULL) 649 errx(1, "calloc fd_set"); 650 651 for (;;) { 652 if (MarkSet) 653 markit(); 654 if (WantDie) 655 die(WantDie); 656 657 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 658 sizeof(fd_mask)); 659 660 if (fklog != -1) 661 FD_SET(fklog, fdsr); 662 if (finet && !SecureMode) { 663 for (i = 0; i < *finet; i++) { 664 if (finet[i+1] != -1) 665 FD_SET(finet[i+1], fdsr); 666 } 667 } 668 STAILQ_FOREACH(fx, &funixes, next) 669 FD_SET(fx->s, fdsr); 670 671 i = select(fdsrmax+1, fdsr, NULL, NULL, 672 needdofsync ? &tv : tvp); 673 switch (i) { 674 case 0: 675 dofsync(); 676 needdofsync = 0; 677 if (tvp) { 678 tvp = NULL; 679 if (ppid != 1) 680 kill(ppid, SIGALRM); 681 } 682 continue; 683 case -1: 684 if (errno != EINTR) 685 logerror("select"); 686 continue; 687 } 688 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 689 readklog(); 690 if (finet && !SecureMode) { 691 for (i = 0; i < *finet; i++) { 692 if (FD_ISSET(finet[i+1], fdsr)) { 693 len = sizeof(frominet); 694 l = recvfrom(finet[i+1], line, MAXLINE, 695 0, (struct sockaddr *)&frominet, 696 &len); 697 if (l > 0) { 698 line[l] = '\0'; 699 hname = cvthname((struct sockaddr *)&frominet); 700 unmapped((struct sockaddr *)&frominet); 701 if (validate((struct sockaddr *)&frominet, hname)) 702 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 703 } else if (l < 0 && errno != EINTR) 704 logerror("recvfrom inet"); 705 } 706 } 707 } 708 STAILQ_FOREACH(fx, &funixes, next) { 709 if (FD_ISSET(fx->s, fdsr)) { 710 len = sizeof(fromunix); 711 l = recvfrom(fx->s, line, MAXLINE, 0, 712 (struct sockaddr *)&fromunix, &len); 713 if (l > 0) { 714 line[l] = '\0'; 715 printline(LocalHostName, line, 0); 716 } else if (l < 0 && errno != EINTR) 717 logerror("recvfrom unix"); 718 } 719 } 720 } 721 if (fdsr) 722 free(fdsr); 723 } 724 725 static void 726 unmapped(struct sockaddr *sa) 727 { 728 struct sockaddr_in6 *sin6; 729 struct sockaddr_in sin4; 730 731 if (sa->sa_family != AF_INET6) 732 return; 733 if (sa->sa_len != sizeof(struct sockaddr_in6) || 734 sizeof(sin4) > sa->sa_len) 735 return; 736 sin6 = (struct sockaddr_in6 *)sa; 737 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 738 return; 739 740 memset(&sin4, 0, sizeof(sin4)); 741 sin4.sin_family = AF_INET; 742 sin4.sin_len = sizeof(struct sockaddr_in); 743 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 744 sizeof(sin4.sin_addr)); 745 sin4.sin_port = sin6->sin6_port; 746 747 memcpy(sa, &sin4, sin4.sin_len); 748 } 749 750 static void 751 usage(void) 752 { 753 754 fprintf(stderr, "%s\n%s\n%s\n%s\n", 755 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 756 " [-b bind_address] [-f config_file]", 757 " [-l [mode:]path] [-m mark_interval]", 758 " [-P pid_file] [-p log_socket]"); 759 exit(1); 760 } 761 762 /* 763 * Take a raw input line, decode the message, and print the message 764 * on the appropriate log files. 765 */ 766 static void 767 printline(const char *hname, char *msg, int flags) 768 { 769 char *p, *q; 770 long n; 771 int c, pri; 772 char line[MAXLINE + 1]; 773 774 /* test for special codes */ 775 p = msg; 776 pri = DEFUPRI; 777 if (*p == '<') { 778 errno = 0; 779 n = strtol(p + 1, &q, 10); 780 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 781 p = q + 1; 782 pri = n; 783 } 784 } 785 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 786 pri = DEFUPRI; 787 788 /* 789 * Don't allow users to log kernel messages. 790 * NOTE: since LOG_KERN == 0 this will also match 791 * messages with no facility specified. 792 */ 793 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 794 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 795 796 q = line; 797 798 while ((c = (unsigned char)*p++) != '\0' && 799 q < &line[sizeof(line) - 4]) { 800 if (mask_C1 && (c & 0x80) && c < 0xA0) { 801 c &= 0x7F; 802 *q++ = 'M'; 803 *q++ = '-'; 804 } 805 if (isascii(c) && iscntrl(c)) { 806 if (c == '\n') { 807 *q++ = ' '; 808 } else if (c == '\t') { 809 *q++ = '\t'; 810 } else { 811 *q++ = '^'; 812 *q++ = c ^ 0100; 813 } 814 } else { 815 *q++ = c; 816 } 817 } 818 *q = '\0'; 819 820 logmsg(pri, line, hname, flags); 821 } 822 823 /* 824 * Read /dev/klog while data are available, split into lines. 825 */ 826 static void 827 readklog(void) 828 { 829 char *p, *q, line[MAXLINE + 1]; 830 int len, i; 831 832 len = 0; 833 for (;;) { 834 i = read(fklog, line + len, MAXLINE - 1 - len); 835 if (i > 0) { 836 line[i + len] = '\0'; 837 } else { 838 if (i < 0 && errno != EINTR && errno != EAGAIN) { 839 logerror("klog"); 840 fklog = -1; 841 } 842 break; 843 } 844 845 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 846 *q = '\0'; 847 printsys(p); 848 } 849 len = strlen(p); 850 if (len >= MAXLINE - 1) { 851 printsys(p); 852 len = 0; 853 } 854 if (len > 0) 855 memmove(line, p, len + 1); 856 } 857 if (len > 0) 858 printsys(line); 859 } 860 861 /* 862 * Take a raw input line from /dev/klog, format similar to syslog(). 863 */ 864 static void 865 printsys(char *msg) 866 { 867 char *p, *q; 868 long n; 869 int flags, isprintf, pri; 870 871 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 872 p = msg; 873 pri = DEFSPRI; 874 isprintf = 1; 875 if (*p == '<') { 876 errno = 0; 877 n = strtol(p + 1, &q, 10); 878 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 879 p = q + 1; 880 pri = n; 881 isprintf = 0; 882 } 883 } 884 /* 885 * Kernel printf's and LOG_CONSOLE messages have been displayed 886 * on the console already. 887 */ 888 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 889 flags |= IGN_CONS; 890 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 891 pri = DEFSPRI; 892 logmsg(pri, p, LocalHostName, flags); 893 } 894 895 static time_t now; 896 897 /* 898 * Match a program or host name against a specification. 899 * Return a non-0 value if the message must be ignored 900 * based on the specification. 901 */ 902 static int 903 skip_message(const char *name, const char *spec, int checkcase) 904 { 905 const char *s; 906 char prev, next; 907 int exclude = 0; 908 /* Behaviour on explicit match */ 909 910 if (spec == NULL) 911 return 0; 912 switch (*spec) { 913 case '-': 914 exclude = 1; 915 /*FALLTHROUGH*/ 916 case '+': 917 spec++; 918 break; 919 default: 920 break; 921 } 922 if (checkcase) 923 s = strstr (spec, name); 924 else 925 s = strcasestr (spec, name); 926 927 if (s != NULL) { 928 prev = (s == spec ? ',' : *(s - 1)); 929 next = *(s + strlen (name)); 930 931 if (prev == ',' && (next == '\0' || next == ',')) 932 /* Explicit match: skip iff the spec is an 933 exclusive one. */ 934 return exclude; 935 } 936 937 /* No explicit match for this name: skip the message iff 938 the spec is an inclusive one. */ 939 return !exclude; 940 } 941 942 /* 943 * Log a message to the appropriate log files, users, etc. based on 944 * the priority. 945 */ 946 static void 947 logmsg(int pri, const char *msg, const char *from, int flags) 948 { 949 struct filed *f; 950 int i, fac, msglen, omask, prilev; 951 const char *timestamp; 952 char prog[NAME_MAX+1]; 953 char buf[MAXLINE+1]; 954 955 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 956 pri, flags, from, msg); 957 958 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 959 960 /* 961 * Check to see if msg looks non-standard. 962 */ 963 msglen = strlen(msg); 964 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 965 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 966 flags |= ADDDATE; 967 968 (void)time(&now); 969 if (flags & ADDDATE) { 970 timestamp = ctime(&now) + 4; 971 } else { 972 timestamp = msg; 973 msg += 16; 974 msglen -= 16; 975 } 976 977 /* skip leading blanks */ 978 while (isspace(*msg)) { 979 msg++; 980 msglen--; 981 } 982 983 /* extract facility and priority level */ 984 if (flags & MARK) 985 fac = LOG_NFACILITIES; 986 else 987 fac = LOG_FAC(pri); 988 989 /* Check maximum facility number. */ 990 if (fac > LOG_NFACILITIES) { 991 (void)sigsetmask(omask); 992 return; 993 } 994 995 prilev = LOG_PRI(pri); 996 997 /* extract program name */ 998 for (i = 0; i < NAME_MAX; i++) { 999 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 1000 msg[i] == '/' || isspace(msg[i])) 1001 break; 1002 prog[i] = msg[i]; 1003 } 1004 prog[i] = 0; 1005 1006 /* add kernel prefix for kernel messages */ 1007 if (flags & ISKERNEL) { 1008 snprintf(buf, sizeof(buf), "%s: %s", 1009 use_bootfile ? bootfile : "kernel", msg); 1010 msg = buf; 1011 msglen = strlen(buf); 1012 } 1013 1014 /* log the message to the particular outputs */ 1015 if (!Initialized) { 1016 f = &consfile; 1017 /* 1018 * Open in non-blocking mode to avoid hangs during open 1019 * and close(waiting for the port to drain). 1020 */ 1021 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1022 1023 if (f->f_file >= 0) { 1024 (void)strlcpy(f->f_lasttime, timestamp, 1025 sizeof(f->f_lasttime)); 1026 fprintlog(f, flags, msg); 1027 (void)close(f->f_file); 1028 } 1029 (void)sigsetmask(omask); 1030 return; 1031 } 1032 for (f = Files; f; f = f->f_next) { 1033 /* skip messages that are incorrect priority */ 1034 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1035 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1036 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1037 ) 1038 || f->f_pmask[fac] == INTERNAL_NOPRI) 1039 continue; 1040 1041 /* skip messages with the incorrect hostname */ 1042 if (skip_message(from, f->f_host, 0)) 1043 continue; 1044 1045 /* skip messages with the incorrect program name */ 1046 if (skip_message(prog, f->f_program, 1)) 1047 continue; 1048 1049 /* skip message to console if it has already been printed */ 1050 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1051 continue; 1052 1053 /* don't output marks to recently written files */ 1054 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1055 continue; 1056 1057 /* 1058 * suppress duplicate lines to this file 1059 */ 1060 if (no_compress - (f->f_type != F_PIPE) < 1 && 1061 (flags & MARK) == 0 && msglen == f->f_prevlen && 1062 !strcmp(msg, f->f_prevline) && 1063 !strcasecmp(from, f->f_prevhost)) { 1064 (void)strlcpy(f->f_lasttime, timestamp, 1065 sizeof(f->f_lasttime)); 1066 f->f_prevcount++; 1067 dprintf("msg repeated %d times, %ld sec of %d\n", 1068 f->f_prevcount, (long)(now - f->f_time), 1069 repeatinterval[f->f_repeatcount]); 1070 /* 1071 * If domark would have logged this by now, 1072 * flush it now (so we don't hold isolated messages), 1073 * but back off so we'll flush less often 1074 * in the future. 1075 */ 1076 if (now > REPEATTIME(f)) { 1077 fprintlog(f, flags, (char *)NULL); 1078 BACKOFF(f); 1079 } 1080 } else { 1081 /* new line, save it */ 1082 if (f->f_prevcount) 1083 fprintlog(f, 0, (char *)NULL); 1084 f->f_repeatcount = 0; 1085 f->f_prevpri = pri; 1086 (void)strlcpy(f->f_lasttime, timestamp, 1087 sizeof(f->f_lasttime)); 1088 (void)strlcpy(f->f_prevhost, from, 1089 sizeof(f->f_prevhost)); 1090 if (msglen < MAXSVLINE) { 1091 f->f_prevlen = msglen; 1092 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1093 fprintlog(f, flags, (char *)NULL); 1094 } else { 1095 f->f_prevline[0] = 0; 1096 f->f_prevlen = 0; 1097 fprintlog(f, flags, msg); 1098 } 1099 } 1100 } 1101 (void)sigsetmask(omask); 1102 } 1103 1104 static void 1105 dofsync(void) 1106 { 1107 struct filed *f; 1108 1109 for (f = Files; f; f = f->f_next) { 1110 if ((f->f_type == F_FILE) && 1111 (f->f_flags & FFLAG_NEEDSYNC)) { 1112 f->f_flags &= ~FFLAG_NEEDSYNC; 1113 (void)fsync(f->f_file); 1114 } 1115 } 1116 } 1117 1118 #define IOV_SIZE 7 1119 static void 1120 fprintlog(struct filed *f, int flags, const char *msg) 1121 { 1122 struct iovec iov[IOV_SIZE]; 1123 struct iovec *v; 1124 struct addrinfo *r; 1125 int i, l, lsent = 0; 1126 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1127 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1128 const char *msgret; 1129 1130 v = iov; 1131 if (f->f_type == F_WALL) { 1132 v->iov_base = greetings; 1133 /* The time displayed is not synchornized with the other log 1134 * destinations (like messages). Following fragment was using 1135 * ctime(&now), which was updating the time every 30 sec. 1136 * With f_lasttime, time is synchronized correctly. 1137 */ 1138 v->iov_len = snprintf(greetings, sizeof greetings, 1139 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1140 f->f_prevhost, f->f_lasttime); 1141 if (v->iov_len >= sizeof greetings) 1142 v->iov_len = sizeof greetings - 1; 1143 v++; 1144 v->iov_base = nul; 1145 v->iov_len = 0; 1146 v++; 1147 } else { 1148 v->iov_base = f->f_lasttime; 1149 v->iov_len = strlen(f->f_lasttime); 1150 v++; 1151 v->iov_base = space; 1152 v->iov_len = 1; 1153 v++; 1154 } 1155 1156 if (LogFacPri) { 1157 static char fp_buf[30]; /* Hollow laugh */ 1158 int fac = f->f_prevpri & LOG_FACMASK; 1159 int pri = LOG_PRI(f->f_prevpri); 1160 const char *f_s = NULL; 1161 char f_n[5]; /* Hollow laugh */ 1162 const char *p_s = NULL; 1163 char p_n[5]; /* Hollow laugh */ 1164 1165 if (LogFacPri > 1) { 1166 const CODE *c; 1167 1168 for (c = facilitynames; c->c_name; c++) { 1169 if (c->c_val == fac) { 1170 f_s = c->c_name; 1171 break; 1172 } 1173 } 1174 for (c = prioritynames; c->c_name; c++) { 1175 if (c->c_val == pri) { 1176 p_s = c->c_name; 1177 break; 1178 } 1179 } 1180 } 1181 if (!f_s) { 1182 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1183 f_s = f_n; 1184 } 1185 if (!p_s) { 1186 snprintf(p_n, sizeof p_n, "%d", pri); 1187 p_s = p_n; 1188 } 1189 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1190 v->iov_base = fp_buf; 1191 v->iov_len = strlen(fp_buf); 1192 } else { 1193 v->iov_base = nul; 1194 v->iov_len = 0; 1195 } 1196 v++; 1197 1198 v->iov_base = f->f_prevhost; 1199 v->iov_len = strlen(v->iov_base); 1200 v++; 1201 v->iov_base = space; 1202 v->iov_len = 1; 1203 v++; 1204 1205 if (msg) { 1206 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1207 if (wmsg == NULL) { 1208 logerror("strdup"); 1209 exit(1); 1210 } 1211 v->iov_base = wmsg; 1212 v->iov_len = strlen(msg); 1213 } else if (f->f_prevcount > 1) { 1214 v->iov_base = repbuf; 1215 v->iov_len = snprintf(repbuf, sizeof repbuf, 1216 "last message repeated %d times", f->f_prevcount); 1217 } else { 1218 v->iov_base = f->f_prevline; 1219 v->iov_len = f->f_prevlen; 1220 } 1221 v++; 1222 1223 dprintf("Logging to %s", TypeNames[f->f_type]); 1224 f->f_time = now; 1225 1226 switch (f->f_type) { 1227 int port; 1228 case F_UNUSED: 1229 dprintf("\n"); 1230 break; 1231 1232 case F_FORW: 1233 port = (int)ntohs(((struct sockaddr_in *) 1234 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1235 if (port != 514) { 1236 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1237 } else { 1238 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1239 } 1240 /* check for local vs remote messages */ 1241 if (strcasecmp(f->f_prevhost, LocalHostName)) 1242 l = snprintf(line, sizeof line - 1, 1243 "<%d>%.15s Forwarded from %s: %s", 1244 f->f_prevpri, (char *)iov[0].iov_base, 1245 f->f_prevhost, (char *)iov[5].iov_base); 1246 else 1247 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1248 f->f_prevpri, (char *)iov[0].iov_base, 1249 (char *)iov[5].iov_base); 1250 if (l < 0) 1251 l = 0; 1252 else if (l > MAXLINE) 1253 l = MAXLINE; 1254 1255 if (finet) { 1256 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1257 for (i = 0; i < *finet; i++) { 1258 #if 0 1259 /* 1260 * should we check AF first, or just 1261 * trial and error? FWD 1262 */ 1263 if (r->ai_family == 1264 address_family_of(finet[i+1])) 1265 #endif 1266 lsent = sendto(finet[i+1], line, l, 0, 1267 r->ai_addr, r->ai_addrlen); 1268 if (lsent == l) 1269 break; 1270 } 1271 if (lsent == l && !send_to_all) 1272 break; 1273 } 1274 dprintf("lsent/l: %d/%d\n", lsent, l); 1275 if (lsent != l) { 1276 int e = errno; 1277 logerror("sendto"); 1278 errno = e; 1279 switch (errno) { 1280 case ENOBUFS: 1281 case ENETDOWN: 1282 case ENETUNREACH: 1283 case EHOSTUNREACH: 1284 case EHOSTDOWN: 1285 case EADDRNOTAVAIL: 1286 break; 1287 /* case EBADF: */ 1288 /* case EACCES: */ 1289 /* case ENOTSOCK: */ 1290 /* case EFAULT: */ 1291 /* case EMSGSIZE: */ 1292 /* case EAGAIN: */ 1293 /* case ENOBUFS: */ 1294 /* case ECONNREFUSED: */ 1295 default: 1296 dprintf("removing entry: errno=%d\n", e); 1297 f->f_type = F_UNUSED; 1298 break; 1299 } 1300 } 1301 } 1302 break; 1303 1304 case F_FILE: 1305 dprintf(" %s\n", f->f_un.f_fname); 1306 v->iov_base = lf; 1307 v->iov_len = 1; 1308 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1309 /* 1310 * If writev(2) fails for potentially transient errors 1311 * like the filesystem being full, ignore it. 1312 * Otherwise remove this logfile from the list. 1313 */ 1314 if (errno != ENOSPC) { 1315 int e = errno; 1316 (void)close(f->f_file); 1317 f->f_type = F_UNUSED; 1318 errno = e; 1319 logerror(f->f_un.f_fname); 1320 } 1321 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1322 f->f_flags |= FFLAG_NEEDSYNC; 1323 needdofsync = 1; 1324 } 1325 break; 1326 1327 case F_PIPE: 1328 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1329 v->iov_base = lf; 1330 v->iov_len = 1; 1331 if (f->f_un.f_pipe.f_pid == 0) { 1332 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1333 &f->f_un.f_pipe.f_pid)) < 0) { 1334 f->f_type = F_UNUSED; 1335 logerror(f->f_un.f_pipe.f_pname); 1336 break; 1337 } 1338 } 1339 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1340 int e = errno; 1341 (void)close(f->f_file); 1342 if (f->f_un.f_pipe.f_pid > 0) 1343 deadq_enter(f->f_un.f_pipe.f_pid, 1344 f->f_un.f_pipe.f_pname); 1345 f->f_un.f_pipe.f_pid = 0; 1346 errno = e; 1347 logerror(f->f_un.f_pipe.f_pname); 1348 } 1349 break; 1350 1351 case F_CONSOLE: 1352 if (flags & IGN_CONS) { 1353 dprintf(" (ignored)\n"); 1354 break; 1355 } 1356 /* FALLTHROUGH */ 1357 1358 case F_TTY: 1359 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1360 v->iov_base = crlf; 1361 v->iov_len = 2; 1362 1363 errno = 0; /* ttymsg() only sometimes returns an errno */ 1364 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1365 f->f_type = F_UNUSED; 1366 logerror(msgret); 1367 } 1368 break; 1369 1370 case F_USERS: 1371 case F_WALL: 1372 dprintf("\n"); 1373 v->iov_base = crlf; 1374 v->iov_len = 2; 1375 wallmsg(f, iov, IOV_SIZE); 1376 break; 1377 } 1378 f->f_prevcount = 0; 1379 free(wmsg); 1380 } 1381 1382 /* 1383 * WALLMSG -- Write a message to the world at large 1384 * 1385 * Write the specified message to either the entire 1386 * world, or a list of approved users. 1387 */ 1388 static void 1389 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1390 { 1391 static int reenter; /* avoid calling ourselves */ 1392 struct utmpx *ut; 1393 int i; 1394 const char *p; 1395 1396 if (reenter++) 1397 return; 1398 setutxent(); 1399 /* NOSTRICT */ 1400 while ((ut = getutxent()) != NULL) { 1401 if (ut->ut_type != USER_PROCESS) 1402 continue; 1403 if (f->f_type == F_WALL) { 1404 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1405 TTYMSGTIME)) != NULL) { 1406 errno = 0; /* already in msg */ 1407 logerror(p); 1408 } 1409 continue; 1410 } 1411 /* should we send the message to this user? */ 1412 for (i = 0; i < MAXUNAMES; i++) { 1413 if (!f->f_un.f_uname[i][0]) 1414 break; 1415 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1416 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1417 TTYMSGTIME)) != NULL) { 1418 errno = 0; /* already in msg */ 1419 logerror(p); 1420 } 1421 break; 1422 } 1423 } 1424 } 1425 endutxent(); 1426 reenter = 0; 1427 } 1428 1429 static void 1430 reapchild(int signo __unused) 1431 { 1432 int status; 1433 pid_t pid; 1434 struct filed *f; 1435 1436 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1437 if (!Initialized) 1438 /* Don't tell while we are initting. */ 1439 continue; 1440 1441 /* First, look if it's a process from the dead queue. */ 1442 if (deadq_remove(pid)) 1443 goto oncemore; 1444 1445 /* Now, look in list of active processes. */ 1446 for (f = Files; f; f = f->f_next) 1447 if (f->f_type == F_PIPE && 1448 f->f_un.f_pipe.f_pid == pid) { 1449 (void)close(f->f_file); 1450 f->f_un.f_pipe.f_pid = 0; 1451 log_deadchild(pid, status, 1452 f->f_un.f_pipe.f_pname); 1453 break; 1454 } 1455 oncemore: 1456 continue; 1457 } 1458 } 1459 1460 /* 1461 * Return a printable representation of a host address. 1462 */ 1463 static const char * 1464 cvthname(struct sockaddr *f) 1465 { 1466 int error, hl; 1467 sigset_t omask, nmask; 1468 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1469 1470 error = getnameinfo((struct sockaddr *)f, 1471 ((struct sockaddr *)f)->sa_len, 1472 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1473 dprintf("cvthname(%s)\n", ip); 1474 1475 if (error) { 1476 dprintf("Malformed from address %s\n", gai_strerror(error)); 1477 return ("???"); 1478 } 1479 if (!resolve) 1480 return (ip); 1481 1482 sigemptyset(&nmask); 1483 sigaddset(&nmask, SIGHUP); 1484 sigprocmask(SIG_BLOCK, &nmask, &omask); 1485 error = getnameinfo((struct sockaddr *)f, 1486 ((struct sockaddr *)f)->sa_len, 1487 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1488 sigprocmask(SIG_SETMASK, &omask, NULL); 1489 if (error) { 1490 dprintf("Host name for your address (%s) unknown\n", ip); 1491 return (ip); 1492 } 1493 hl = strlen(hname); 1494 if (hl > 0 && hname[hl-1] == '.') 1495 hname[--hl] = '\0'; 1496 trimdomain(hname, hl); 1497 return (hname); 1498 } 1499 1500 static void 1501 dodie(int signo) 1502 { 1503 1504 WantDie = signo; 1505 } 1506 1507 static void 1508 domark(int signo __unused) 1509 { 1510 1511 MarkSet = 1; 1512 } 1513 1514 /* 1515 * Print syslogd errors some place. 1516 */ 1517 static void 1518 logerror(const char *type) 1519 { 1520 char buf[512]; 1521 static int recursed = 0; 1522 1523 /* If there's an error while trying to log an error, give up. */ 1524 if (recursed) 1525 return; 1526 recursed++; 1527 if (errno) 1528 (void)snprintf(buf, 1529 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1530 else 1531 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1532 errno = 0; 1533 dprintf("%s\n", buf); 1534 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1535 recursed--; 1536 } 1537 1538 static void 1539 die(int signo) 1540 { 1541 struct filed *f; 1542 struct funix *fx; 1543 int was_initialized; 1544 char buf[100]; 1545 1546 was_initialized = Initialized; 1547 Initialized = 0; /* Don't log SIGCHLDs. */ 1548 for (f = Files; f != NULL; f = f->f_next) { 1549 /* flush any pending output */ 1550 if (f->f_prevcount) 1551 fprintlog(f, 0, (char *)NULL); 1552 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1553 (void)close(f->f_file); 1554 f->f_un.f_pipe.f_pid = 0; 1555 } 1556 } 1557 Initialized = was_initialized; 1558 if (signo) { 1559 dprintf("syslogd: exiting on signal %d\n", signo); 1560 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1561 errno = 0; 1562 logerror(buf); 1563 } 1564 STAILQ_FOREACH(fx, &funixes, next) 1565 (void)unlink(fx->name); 1566 pidfile_remove(pfh); 1567 1568 exit(1); 1569 } 1570 1571 /* 1572 * INIT -- Initialize syslogd from configuration table 1573 */ 1574 static void 1575 init(int signo) 1576 { 1577 int i; 1578 FILE *cf; 1579 struct filed *f, *next, **nextp; 1580 char *p; 1581 char cline[LINE_MAX]; 1582 char prog[LINE_MAX]; 1583 char host[MAXHOSTNAMELEN]; 1584 char oldLocalHostName[MAXHOSTNAMELEN]; 1585 char hostMsg[2*MAXHOSTNAMELEN+40]; 1586 char bootfileMsg[LINE_MAX]; 1587 1588 dprintf("init\n"); 1589 1590 /* 1591 * Load hostname (may have changed). 1592 */ 1593 if (signo != 0) 1594 (void)strlcpy(oldLocalHostName, LocalHostName, 1595 sizeof(oldLocalHostName)); 1596 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1597 err(EX_OSERR, "gethostname() failed"); 1598 if ((p = strchr(LocalHostName, '.')) != NULL) { 1599 *p++ = '\0'; 1600 LocalDomain = p; 1601 } else { 1602 LocalDomain = ""; 1603 } 1604 1605 /* 1606 * Load / reload timezone data (in case it changed). 1607 * 1608 * Just calling tzset() again does not work, the timezone code 1609 * caches the result. However, by setting the TZ variable, one 1610 * can defeat the caching and have the timezone code really 1611 * reload the timezone data. Respect any initial setting of 1612 * TZ, in case the system is configured specially. 1613 */ 1614 dprintf("loading timezone data via tzset()\n"); 1615 if (getenv("TZ")) { 1616 tzset(); 1617 } else { 1618 setenv("TZ", ":/etc/localtime", 1); 1619 tzset(); 1620 unsetenv("TZ"); 1621 } 1622 1623 /* 1624 * Close all open log files. 1625 */ 1626 Initialized = 0; 1627 for (f = Files; f != NULL; f = next) { 1628 /* flush any pending output */ 1629 if (f->f_prevcount) 1630 fprintlog(f, 0, (char *)NULL); 1631 1632 switch (f->f_type) { 1633 case F_FILE: 1634 case F_FORW: 1635 case F_CONSOLE: 1636 case F_TTY: 1637 (void)close(f->f_file); 1638 break; 1639 case F_PIPE: 1640 if (f->f_un.f_pipe.f_pid > 0) { 1641 (void)close(f->f_file); 1642 deadq_enter(f->f_un.f_pipe.f_pid, 1643 f->f_un.f_pipe.f_pname); 1644 } 1645 f->f_un.f_pipe.f_pid = 0; 1646 break; 1647 } 1648 next = f->f_next; 1649 if (f->f_program) free(f->f_program); 1650 if (f->f_host) free(f->f_host); 1651 free((char *)f); 1652 } 1653 Files = NULL; 1654 nextp = &Files; 1655 1656 /* open the configuration file */ 1657 if ((cf = fopen(ConfFile, "r")) == NULL) { 1658 dprintf("cannot open %s\n", ConfFile); 1659 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1660 if (*nextp == NULL) { 1661 logerror("calloc"); 1662 exit(1); 1663 } 1664 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1665 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1666 if ((*nextp)->f_next == NULL) { 1667 logerror("calloc"); 1668 exit(1); 1669 } 1670 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1671 Initialized = 1; 1672 return; 1673 } 1674 1675 /* 1676 * Foreach line in the conf table, open that file. 1677 */ 1678 f = NULL; 1679 (void)strlcpy(host, "*", sizeof(host)); 1680 (void)strlcpy(prog, "*", sizeof(prog)); 1681 while (fgets(cline, sizeof(cline), cf) != NULL) { 1682 /* 1683 * check for end-of-section, comments, strip off trailing 1684 * spaces and newline character. #!prog is treated specially: 1685 * following lines apply only to that program. 1686 */ 1687 for (p = cline; isspace(*p); ++p) 1688 continue; 1689 if (*p == 0) 1690 continue; 1691 if (*p == '#') { 1692 p++; 1693 if (*p != '!' && *p != '+' && *p != '-') 1694 continue; 1695 } 1696 if (*p == '+' || *p == '-') { 1697 host[0] = *p++; 1698 while (isspace(*p)) 1699 p++; 1700 if ((!*p) || (*p == '*')) { 1701 (void)strlcpy(host, "*", sizeof(host)); 1702 continue; 1703 } 1704 if (*p == '@') 1705 p = LocalHostName; 1706 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1707 if (!isalnum(*p) && *p != '.' && *p != '-' 1708 && *p != ',' && *p != ':' && *p != '%') 1709 break; 1710 host[i] = *p++; 1711 } 1712 host[i] = '\0'; 1713 continue; 1714 } 1715 if (*p == '!') { 1716 p++; 1717 while (isspace(*p)) p++; 1718 if ((!*p) || (*p == '*')) { 1719 (void)strlcpy(prog, "*", sizeof(prog)); 1720 continue; 1721 } 1722 for (i = 0; i < LINE_MAX - 1; i++) { 1723 if (!isprint(p[i]) || isspace(p[i])) 1724 break; 1725 prog[i] = p[i]; 1726 } 1727 prog[i] = 0; 1728 continue; 1729 } 1730 for (p = cline + 1; *p != '\0'; p++) { 1731 if (*p != '#') 1732 continue; 1733 if (*(p - 1) == '\\') { 1734 strcpy(p - 1, p); 1735 p--; 1736 continue; 1737 } 1738 *p = '\0'; 1739 break; 1740 } 1741 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1742 cline[i] = '\0'; 1743 f = (struct filed *)calloc(1, sizeof(*f)); 1744 if (f == NULL) { 1745 logerror("calloc"); 1746 exit(1); 1747 } 1748 *nextp = f; 1749 nextp = &f->f_next; 1750 cfline(cline, f, prog, host); 1751 } 1752 1753 /* close the configuration file */ 1754 (void)fclose(cf); 1755 1756 Initialized = 1; 1757 1758 if (Debug) { 1759 int port; 1760 for (f = Files; f; f = f->f_next) { 1761 for (i = 0; i <= LOG_NFACILITIES; i++) 1762 if (f->f_pmask[i] == INTERNAL_NOPRI) 1763 printf("X "); 1764 else 1765 printf("%d ", f->f_pmask[i]); 1766 printf("%s: ", TypeNames[f->f_type]); 1767 switch (f->f_type) { 1768 case F_FILE: 1769 printf("%s", f->f_un.f_fname); 1770 break; 1771 1772 case F_CONSOLE: 1773 case F_TTY: 1774 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1775 break; 1776 1777 case F_FORW: 1778 port = (int)ntohs(((struct sockaddr_in *) 1779 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1780 if (port != 514) { 1781 printf("%s:%d", 1782 f->f_un.f_forw.f_hname, port); 1783 } else { 1784 printf("%s", f->f_un.f_forw.f_hname); 1785 } 1786 break; 1787 1788 case F_PIPE: 1789 printf("%s", f->f_un.f_pipe.f_pname); 1790 break; 1791 1792 case F_USERS: 1793 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1794 printf("%s, ", f->f_un.f_uname[i]); 1795 break; 1796 } 1797 if (f->f_program) 1798 printf(" (%s)", f->f_program); 1799 printf("\n"); 1800 } 1801 } 1802 1803 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1804 dprintf("syslogd: restarted\n"); 1805 /* 1806 * Log a change in hostname, but only on a restart. 1807 */ 1808 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1809 (void)snprintf(hostMsg, sizeof(hostMsg), 1810 "syslogd: hostname changed, \"%s\" to \"%s\"", 1811 oldLocalHostName, LocalHostName); 1812 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1813 dprintf("%s\n", hostMsg); 1814 } 1815 /* 1816 * Log the kernel boot file if we aren't going to use it as 1817 * the prefix, and if this is *not* a restart. 1818 */ 1819 if (signo == 0 && !use_bootfile) { 1820 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1821 "syslogd: kernel boot file is %s", bootfile); 1822 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1823 dprintf("%s\n", bootfileMsg); 1824 } 1825 } 1826 1827 /* 1828 * Crack a configuration file line 1829 */ 1830 static void 1831 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1832 { 1833 struct addrinfo hints, *res; 1834 int error, i, pri, syncfile; 1835 const char *p, *q; 1836 char *bp; 1837 char buf[MAXLINE], ebuf[100]; 1838 1839 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1840 1841 errno = 0; /* keep strerror() stuff out of logerror messages */ 1842 1843 /* clear out file entry */ 1844 memset(f, 0, sizeof(*f)); 1845 for (i = 0; i <= LOG_NFACILITIES; i++) 1846 f->f_pmask[i] = INTERNAL_NOPRI; 1847 1848 /* save hostname if any */ 1849 if (host && *host == '*') 1850 host = NULL; 1851 if (host) { 1852 int hl; 1853 1854 f->f_host = strdup(host); 1855 if (f->f_host == NULL) { 1856 logerror("strdup"); 1857 exit(1); 1858 } 1859 hl = strlen(f->f_host); 1860 if (hl > 0 && f->f_host[hl-1] == '.') 1861 f->f_host[--hl] = '\0'; 1862 trimdomain(f->f_host, hl); 1863 } 1864 1865 /* save program name if any */ 1866 if (prog && *prog == '*') 1867 prog = NULL; 1868 if (prog) { 1869 f->f_program = strdup(prog); 1870 if (f->f_program == NULL) { 1871 logerror("strdup"); 1872 exit(1); 1873 } 1874 } 1875 1876 /* scan through the list of selectors */ 1877 for (p = line; *p && *p != '\t' && *p != ' ';) { 1878 int pri_done; 1879 int pri_cmp; 1880 int pri_invert; 1881 1882 /* find the end of this facility name list */ 1883 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1884 continue; 1885 1886 /* get the priority comparison */ 1887 pri_cmp = 0; 1888 pri_done = 0; 1889 pri_invert = 0; 1890 if (*q == '!') { 1891 pri_invert = 1; 1892 q++; 1893 } 1894 while (!pri_done) { 1895 switch (*q) { 1896 case '<': 1897 pri_cmp |= PRI_LT; 1898 q++; 1899 break; 1900 case '=': 1901 pri_cmp |= PRI_EQ; 1902 q++; 1903 break; 1904 case '>': 1905 pri_cmp |= PRI_GT; 1906 q++; 1907 break; 1908 default: 1909 pri_done++; 1910 break; 1911 } 1912 } 1913 1914 /* collect priority name */ 1915 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1916 *bp++ = *q++; 1917 *bp = '\0'; 1918 1919 /* skip cruft */ 1920 while (strchr(",;", *q)) 1921 q++; 1922 1923 /* decode priority name */ 1924 if (*buf == '*') { 1925 pri = LOG_PRIMASK; 1926 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1927 } else { 1928 /* Ignore trailing spaces. */ 1929 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1930 buf[i] = '\0'; 1931 1932 pri = decode(buf, prioritynames); 1933 if (pri < 0) { 1934 errno = 0; 1935 (void)snprintf(ebuf, sizeof ebuf, 1936 "unknown priority name \"%s\"", buf); 1937 logerror(ebuf); 1938 return; 1939 } 1940 } 1941 if (!pri_cmp) 1942 pri_cmp = (UniquePriority) 1943 ? (PRI_EQ) 1944 : (PRI_EQ | PRI_GT) 1945 ; 1946 if (pri_invert) 1947 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1948 1949 /* scan facilities */ 1950 while (*p && !strchr("\t.; ", *p)) { 1951 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1952 *bp++ = *p++; 1953 *bp = '\0'; 1954 1955 if (*buf == '*') { 1956 for (i = 0; i < LOG_NFACILITIES; i++) { 1957 f->f_pmask[i] = pri; 1958 f->f_pcmp[i] = pri_cmp; 1959 } 1960 } else { 1961 i = decode(buf, facilitynames); 1962 if (i < 0) { 1963 errno = 0; 1964 (void)snprintf(ebuf, sizeof ebuf, 1965 "unknown facility name \"%s\"", 1966 buf); 1967 logerror(ebuf); 1968 return; 1969 } 1970 f->f_pmask[i >> 3] = pri; 1971 f->f_pcmp[i >> 3] = pri_cmp; 1972 } 1973 while (*p == ',' || *p == ' ') 1974 p++; 1975 } 1976 1977 p = q; 1978 } 1979 1980 /* skip to action part */ 1981 while (*p == '\t' || *p == ' ') 1982 p++; 1983 1984 if (*p == '-') { 1985 syncfile = 0; 1986 p++; 1987 } else 1988 syncfile = 1; 1989 1990 switch (*p) { 1991 case '@': 1992 { 1993 char *tp; 1994 char endkey = ':'; 1995 /* 1996 * scan forward to see if there is a port defined. 1997 * so we can't use strlcpy.. 1998 */ 1999 i = sizeof(f->f_un.f_forw.f_hname); 2000 tp = f->f_un.f_forw.f_hname; 2001 p++; 2002 2003 /* 2004 * an ipv6 address should start with a '[' in that case 2005 * we should scan for a ']' 2006 */ 2007 if (*p == '[') { 2008 p++; 2009 endkey = ']'; 2010 } 2011 while (*p && (*p != endkey) && (i-- > 0)) { 2012 *tp++ = *p++; 2013 } 2014 if (endkey == ']' && *p == endkey) 2015 p++; 2016 *tp = '\0'; 2017 } 2018 /* See if we copied a domain and have a port */ 2019 if (*p == ':') 2020 p++; 2021 else 2022 p = NULL; 2023 2024 memset(&hints, 0, sizeof(hints)); 2025 hints.ai_family = family; 2026 hints.ai_socktype = SOCK_DGRAM; 2027 error = getaddrinfo(f->f_un.f_forw.f_hname, 2028 p ? p : "syslog", &hints, &res); 2029 if (error) { 2030 logerror(gai_strerror(error)); 2031 break; 2032 } 2033 f->f_un.f_forw.f_addr = res; 2034 f->f_type = F_FORW; 2035 break; 2036 2037 case '/': 2038 if ((f->f_file = open(p, logflags, 0600)) < 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 if (strcmp(p, ctty) == 0) 2047 f->f_type = F_CONSOLE; 2048 else 2049 f->f_type = F_TTY; 2050 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 2051 sizeof(f->f_un.f_fname)); 2052 } else { 2053 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2054 f->f_type = F_FILE; 2055 } 2056 break; 2057 2058 case '|': 2059 f->f_un.f_pipe.f_pid = 0; 2060 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2061 sizeof(f->f_un.f_pipe.f_pname)); 2062 f->f_type = F_PIPE; 2063 break; 2064 2065 case '*': 2066 f->f_type = F_WALL; 2067 break; 2068 2069 default: 2070 for (i = 0; i < MAXUNAMES && *p; i++) { 2071 for (q = p; *q && *q != ','; ) 2072 q++; 2073 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2074 if ((q - p) >= MAXLOGNAME) 2075 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2076 else 2077 f->f_un.f_uname[i][q - p] = '\0'; 2078 while (*q == ',' || *q == ' ') 2079 q++; 2080 p = q; 2081 } 2082 f->f_type = F_USERS; 2083 break; 2084 } 2085 } 2086 2087 2088 /* 2089 * Decode a symbolic name to a numeric value 2090 */ 2091 static int 2092 decode(const char *name, const CODE *codetab) 2093 { 2094 const CODE *c; 2095 char *p, buf[40]; 2096 2097 if (isdigit(*name)) 2098 return (atoi(name)); 2099 2100 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2101 if (isupper(*name)) 2102 *p = tolower(*name); 2103 else 2104 *p = *name; 2105 } 2106 *p = '\0'; 2107 for (c = codetab; c->c_name; c++) 2108 if (!strcmp(buf, c->c_name)) 2109 return (c->c_val); 2110 2111 return (-1); 2112 } 2113 2114 static void 2115 markit(void) 2116 { 2117 struct filed *f; 2118 dq_t q, next; 2119 2120 now = time((time_t *)NULL); 2121 MarkSeq += TIMERINTVL; 2122 if (MarkSeq >= MarkInterval) { 2123 logmsg(LOG_INFO, "-- MARK --", 2124 LocalHostName, ADDDATE|MARK); 2125 MarkSeq = 0; 2126 } 2127 2128 for (f = Files; f; f = f->f_next) { 2129 if (f->f_prevcount && now >= REPEATTIME(f)) { 2130 dprintf("flush %s: repeated %d times, %d sec.\n", 2131 TypeNames[f->f_type], f->f_prevcount, 2132 repeatinterval[f->f_repeatcount]); 2133 fprintlog(f, 0, (char *)NULL); 2134 BACKOFF(f); 2135 } 2136 } 2137 2138 /* Walk the dead queue, and see if we should signal somebody. */ 2139 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2140 next = TAILQ_NEXT(q, dq_entries); 2141 2142 switch (q->dq_timeout) { 2143 case 0: 2144 /* Already signalled once, try harder now. */ 2145 if (kill(q->dq_pid, SIGKILL) != 0) 2146 (void)deadq_remove(q->dq_pid); 2147 break; 2148 2149 case 1: 2150 /* 2151 * Timed out on dead queue, send terminate 2152 * signal. Note that we leave the removal 2153 * from the dead queue to reapchild(), which 2154 * will also log the event (unless the process 2155 * didn't even really exist, in case we simply 2156 * drop it from the dead queue). 2157 */ 2158 if (kill(q->dq_pid, SIGTERM) != 0) 2159 (void)deadq_remove(q->dq_pid); 2160 /* FALLTHROUGH */ 2161 2162 default: 2163 q->dq_timeout--; 2164 } 2165 } 2166 MarkSet = 0; 2167 (void)alarm(TIMERINTVL); 2168 } 2169 2170 /* 2171 * fork off and become a daemon, but wait for the child to come online 2172 * before returing to the parent, or we get disk thrashing at boot etc. 2173 * Set a timer so we don't hang forever if it wedges. 2174 */ 2175 static int 2176 waitdaemon(int nochdir, int noclose, int maxwait) 2177 { 2178 int fd; 2179 int status; 2180 pid_t pid, childpid; 2181 2182 switch (childpid = fork()) { 2183 case -1: 2184 return (-1); 2185 case 0: 2186 break; 2187 default: 2188 signal(SIGALRM, timedout); 2189 alarm(maxwait); 2190 while ((pid = wait3(&status, 0, NULL)) != -1) { 2191 if (WIFEXITED(status)) 2192 errx(1, "child pid %d exited with return code %d", 2193 pid, WEXITSTATUS(status)); 2194 if (WIFSIGNALED(status)) 2195 errx(1, "child pid %d exited on signal %d%s", 2196 pid, WTERMSIG(status), 2197 WCOREDUMP(status) ? " (core dumped)" : 2198 ""); 2199 if (pid == childpid) /* it's gone... */ 2200 break; 2201 } 2202 exit(0); 2203 } 2204 2205 if (setsid() == -1) 2206 return (-1); 2207 2208 if (!nochdir) 2209 (void)chdir("/"); 2210 2211 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2212 (void)dup2(fd, STDIN_FILENO); 2213 (void)dup2(fd, STDOUT_FILENO); 2214 (void)dup2(fd, STDERR_FILENO); 2215 if (fd > 2) 2216 (void)close (fd); 2217 } 2218 return (getppid()); 2219 } 2220 2221 /* 2222 * We get a SIGALRM from the child when it's running and finished doing it's 2223 * fsync()'s or O_SYNC writes for all the boot messages. 2224 * 2225 * We also get a signal from the kernel if the timer expires, so check to 2226 * see what happened. 2227 */ 2228 static void 2229 timedout(int sig __unused) 2230 { 2231 int left; 2232 left = alarm(0); 2233 signal(SIGALRM, SIG_DFL); 2234 if (left == 0) 2235 errx(1, "timed out waiting for child"); 2236 else 2237 _exit(0); 2238 } 2239 2240 /* 2241 * Add `s' to the list of allowable peer addresses to accept messages 2242 * from. 2243 * 2244 * `s' is a string in the form: 2245 * 2246 * [*]domainname[:{servicename|portnumber|*}] 2247 * 2248 * or 2249 * 2250 * netaddr/maskbits[:{servicename|portnumber|*}] 2251 * 2252 * Returns -1 on error, 0 if the argument was valid. 2253 */ 2254 static int 2255 allowaddr(char *s) 2256 { 2257 char *cp1, *cp2; 2258 struct allowedpeer ap; 2259 struct servent *se; 2260 int masklen = -1; 2261 struct addrinfo hints, *res; 2262 struct in_addr *addrp, *maskp; 2263 #ifdef INET6 2264 int i; 2265 u_int32_t *addr6p, *mask6p; 2266 #endif 2267 char ip[NI_MAXHOST]; 2268 2269 #ifdef INET6 2270 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2271 #endif 2272 cp1 = s; 2273 if ((cp1 = strrchr(cp1, ':'))) { 2274 /* service/port provided */ 2275 *cp1++ = '\0'; 2276 if (strlen(cp1) == 1 && *cp1 == '*') 2277 /* any port allowed */ 2278 ap.port = 0; 2279 else if ((se = getservbyname(cp1, "udp"))) { 2280 ap.port = ntohs(se->s_port); 2281 } else { 2282 ap.port = strtol(cp1, &cp2, 0); 2283 if (*cp2 != '\0') 2284 return (-1); /* port not numeric */ 2285 } 2286 } else { 2287 if ((se = getservbyname("syslog", "udp"))) 2288 ap.port = ntohs(se->s_port); 2289 else 2290 /* sanity, should not happen */ 2291 ap.port = 514; 2292 } 2293 2294 if ((cp1 = strchr(s, '/')) != NULL && 2295 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2296 *cp1 = '\0'; 2297 if ((masklen = atoi(cp1 + 1)) < 0) 2298 return (-1); 2299 } 2300 #ifdef INET6 2301 if (*s == '[') { 2302 cp2 = s + strlen(s) - 1; 2303 if (*cp2 == ']') { 2304 ++s; 2305 *cp2 = '\0'; 2306 } else { 2307 cp2 = NULL; 2308 } 2309 } else { 2310 cp2 = NULL; 2311 } 2312 #endif 2313 memset(&hints, 0, sizeof(hints)); 2314 hints.ai_family = PF_UNSPEC; 2315 hints.ai_socktype = SOCK_DGRAM; 2316 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2317 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2318 ap.isnumeric = 1; 2319 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2320 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2321 ap.a_mask.ss_family = res->ai_family; 2322 if (res->ai_family == AF_INET) { 2323 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2324 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2325 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2326 if (masklen < 0) { 2327 /* use default netmask */ 2328 if (IN_CLASSA(ntohl(addrp->s_addr))) 2329 maskp->s_addr = htonl(IN_CLASSA_NET); 2330 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2331 maskp->s_addr = htonl(IN_CLASSB_NET); 2332 else 2333 maskp->s_addr = htonl(IN_CLASSC_NET); 2334 } else if (masklen <= 32) { 2335 /* convert masklen to netmask */ 2336 if (masklen == 0) 2337 maskp->s_addr = 0; 2338 else 2339 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2340 } else { 2341 freeaddrinfo(res); 2342 return (-1); 2343 } 2344 /* Lose any host bits in the network number. */ 2345 addrp->s_addr &= maskp->s_addr; 2346 } 2347 #ifdef INET6 2348 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2349 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2350 if (masklen < 0) 2351 masklen = 128; 2352 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2353 /* convert masklen to netmask */ 2354 while (masklen > 0) { 2355 if (masklen < 32) { 2356 *mask6p = htonl(~(0xffffffff >> masklen)); 2357 break; 2358 } 2359 *mask6p++ = 0xffffffff; 2360 masklen -= 32; 2361 } 2362 /* Lose any host bits in the network number. */ 2363 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2364 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2365 for (i = 0; i < 4; i++) 2366 addr6p[i] &= mask6p[i]; 2367 } 2368 #endif 2369 else { 2370 freeaddrinfo(res); 2371 return (-1); 2372 } 2373 freeaddrinfo(res); 2374 } else { 2375 /* arg `s' is domain name */ 2376 ap.isnumeric = 0; 2377 ap.a_name = s; 2378 if (cp1) 2379 *cp1 = '/'; 2380 #ifdef INET6 2381 if (cp2) { 2382 *cp2 = ']'; 2383 --s; 2384 } 2385 #endif 2386 } 2387 2388 if (Debug) { 2389 printf("allowaddr: rule %d: ", NumAllowed); 2390 if (ap.isnumeric) { 2391 printf("numeric, "); 2392 getnameinfo((struct sockaddr *)&ap.a_addr, 2393 ((struct sockaddr *)&ap.a_addr)->sa_len, 2394 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2395 printf("addr = %s, ", ip); 2396 getnameinfo((struct sockaddr *)&ap.a_mask, 2397 ((struct sockaddr *)&ap.a_mask)->sa_len, 2398 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2399 printf("mask = %s; ", ip); 2400 } else { 2401 printf("domainname = %s; ", ap.a_name); 2402 } 2403 printf("port = %d\n", ap.port); 2404 } 2405 2406 if ((AllowedPeers = realloc(AllowedPeers, 2407 ++NumAllowed * sizeof(struct allowedpeer))) 2408 == NULL) { 2409 logerror("realloc"); 2410 exit(1); 2411 } 2412 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2413 return (0); 2414 } 2415 2416 /* 2417 * Validate that the remote peer has permission to log to us. 2418 */ 2419 static int 2420 validate(struct sockaddr *sa, const char *hname) 2421 { 2422 int i; 2423 size_t l1, l2; 2424 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2425 struct allowedpeer *ap; 2426 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2427 #ifdef INET6 2428 int j, reject; 2429 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2430 #endif 2431 struct addrinfo hints, *res; 2432 u_short sport; 2433 2434 if (NumAllowed == 0) 2435 /* traditional behaviour, allow everything */ 2436 return (1); 2437 2438 (void)strlcpy(name, hname, sizeof(name)); 2439 memset(&hints, 0, sizeof(hints)); 2440 hints.ai_family = PF_UNSPEC; 2441 hints.ai_socktype = SOCK_DGRAM; 2442 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2443 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2444 freeaddrinfo(res); 2445 else if (strchr(name, '.') == NULL) { 2446 strlcat(name, ".", sizeof name); 2447 strlcat(name, LocalDomain, sizeof name); 2448 } 2449 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2450 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2451 return (0); /* for safety, should not occur */ 2452 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2453 ip, port, name); 2454 sport = atoi(port); 2455 2456 /* now, walk down the list */ 2457 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2458 if (ap->port != 0 && ap->port != sport) { 2459 dprintf("rejected in rule %d due to port mismatch.\n", i); 2460 continue; 2461 } 2462 2463 if (ap->isnumeric) { 2464 if (ap->a_addr.ss_family != sa->sa_family) { 2465 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2466 continue; 2467 } 2468 if (ap->a_addr.ss_family == AF_INET) { 2469 sin4 = (struct sockaddr_in *)sa; 2470 a4p = (struct sockaddr_in *)&ap->a_addr; 2471 m4p = (struct sockaddr_in *)&ap->a_mask; 2472 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2473 != a4p->sin_addr.s_addr) { 2474 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2475 continue; 2476 } 2477 } 2478 #ifdef INET6 2479 else if (ap->a_addr.ss_family == AF_INET6) { 2480 sin6 = (struct sockaddr_in6 *)sa; 2481 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2482 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2483 if (a6p->sin6_scope_id != 0 && 2484 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2485 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2486 continue; 2487 } 2488 reject = 0; 2489 for (j = 0; j < 16; j += 4) { 2490 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2491 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2492 ++reject; 2493 break; 2494 } 2495 } 2496 if (reject) { 2497 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2498 continue; 2499 } 2500 } 2501 #endif 2502 else 2503 continue; 2504 } else { 2505 cp = ap->a_name; 2506 l1 = strlen(name); 2507 if (*cp == '*') { 2508 /* allow wildmatch */ 2509 cp++; 2510 l2 = strlen(cp); 2511 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2512 dprintf("rejected in rule %d due to name mismatch.\n", i); 2513 continue; 2514 } 2515 } else { 2516 /* exact match */ 2517 l2 = strlen(cp); 2518 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2519 dprintf("rejected in rule %d due to name mismatch.\n", i); 2520 continue; 2521 } 2522 } 2523 } 2524 dprintf("accepted in rule %d.\n", i); 2525 return (1); /* hooray! */ 2526 } 2527 return (0); 2528 } 2529 2530 /* 2531 * Fairly similar to popen(3), but returns an open descriptor, as 2532 * opposed to a FILE *. 2533 */ 2534 static int 2535 p_open(const char *prog, pid_t *rpid) 2536 { 2537 int pfd[2], nulldesc; 2538 pid_t pid; 2539 sigset_t omask, mask; 2540 char *argv[4]; /* sh -c cmd NULL */ 2541 char errmsg[200]; 2542 2543 if (pipe(pfd) == -1) 2544 return (-1); 2545 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2546 /* we are royally screwed anyway */ 2547 return (-1); 2548 2549 sigemptyset(&mask); 2550 sigaddset(&mask, SIGALRM); 2551 sigaddset(&mask, SIGHUP); 2552 sigprocmask(SIG_BLOCK, &mask, &omask); 2553 switch ((pid = fork())) { 2554 case -1: 2555 sigprocmask(SIG_SETMASK, &omask, 0); 2556 close(nulldesc); 2557 return (-1); 2558 2559 case 0: 2560 argv[0] = strdup("sh"); 2561 argv[1] = strdup("-c"); 2562 argv[2] = strdup(prog); 2563 argv[3] = NULL; 2564 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2565 logerror("strdup"); 2566 exit(1); 2567 } 2568 2569 alarm(0); 2570 (void)setsid(); /* Avoid catching SIGHUPs. */ 2571 2572 /* 2573 * Throw away pending signals, and reset signal 2574 * behaviour to standard values. 2575 */ 2576 signal(SIGALRM, SIG_IGN); 2577 signal(SIGHUP, SIG_IGN); 2578 sigprocmask(SIG_SETMASK, &omask, 0); 2579 signal(SIGPIPE, SIG_DFL); 2580 signal(SIGQUIT, SIG_DFL); 2581 signal(SIGALRM, SIG_DFL); 2582 signal(SIGHUP, SIG_DFL); 2583 2584 dup2(pfd[0], STDIN_FILENO); 2585 dup2(nulldesc, STDOUT_FILENO); 2586 dup2(nulldesc, STDERR_FILENO); 2587 closefrom(3); 2588 2589 (void)execvp(_PATH_BSHELL, argv); 2590 _exit(255); 2591 } 2592 2593 sigprocmask(SIG_SETMASK, &omask, 0); 2594 close(nulldesc); 2595 close(pfd[0]); 2596 /* 2597 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2598 * supposed to get an EWOULDBLOCK on writev(2), which is 2599 * caught by the logic above anyway, which will in turn close 2600 * the pipe, and fork a new logging subprocess if necessary. 2601 * The stale subprocess will be killed some time later unless 2602 * it terminated itself due to closing its input pipe (so we 2603 * get rid of really dead puppies). 2604 */ 2605 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2606 /* This is bad. */ 2607 (void)snprintf(errmsg, sizeof errmsg, 2608 "Warning: cannot change pipe to PID %d to " 2609 "non-blocking behaviour.", 2610 (int)pid); 2611 logerror(errmsg); 2612 } 2613 *rpid = pid; 2614 return (pfd[1]); 2615 } 2616 2617 static void 2618 deadq_enter(pid_t pid, const char *name) 2619 { 2620 dq_t p; 2621 int status; 2622 2623 /* 2624 * Be paranoid, if we can't signal the process, don't enter it 2625 * into the dead queue (perhaps it's already dead). If possible, 2626 * we try to fetch and log the child's status. 2627 */ 2628 if (kill(pid, 0) != 0) { 2629 if (waitpid(pid, &status, WNOHANG) > 0) 2630 log_deadchild(pid, status, name); 2631 return; 2632 } 2633 2634 p = malloc(sizeof(struct deadq_entry)); 2635 if (p == NULL) { 2636 logerror("malloc"); 2637 exit(1); 2638 } 2639 2640 p->dq_pid = pid; 2641 p->dq_timeout = DQ_TIMO_INIT; 2642 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2643 } 2644 2645 static int 2646 deadq_remove(pid_t pid) 2647 { 2648 dq_t q; 2649 2650 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2651 if (q->dq_pid == pid) { 2652 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2653 free(q); 2654 return (1); 2655 } 2656 } 2657 2658 return (0); 2659 } 2660 2661 static void 2662 log_deadchild(pid_t pid, int status, const char *name) 2663 { 2664 int code; 2665 char buf[256]; 2666 const char *reason; 2667 2668 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2669 if (WIFSIGNALED(status)) { 2670 reason = "due to signal"; 2671 code = WTERMSIG(status); 2672 } else { 2673 reason = "with status"; 2674 code = WEXITSTATUS(status); 2675 if (code == 0) 2676 return; 2677 } 2678 (void)snprintf(buf, sizeof buf, 2679 "Logging subprocess %d (%s) exited %s %d.", 2680 pid, name, reason, code); 2681 logerror(buf); 2682 } 2683 2684 static int * 2685 socksetup(int af, char *bindhostname) 2686 { 2687 struct addrinfo hints, *res, *r; 2688 const char *bindservice; 2689 char *cp; 2690 int error, maxs, *s, *socks; 2691 2692 /* 2693 * We have to handle this case for backwards compatibility: 2694 * If there are two (or more) colons but no '[' and ']', 2695 * assume this is an inet6 address without a service. 2696 */ 2697 bindservice = "syslog"; 2698 if (bindhostname != NULL) { 2699 #ifdef INET6 2700 if (*bindhostname == '[' && 2701 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2702 ++bindhostname; 2703 *cp = '\0'; 2704 if (cp[1] == ':' && cp[2] != '\0') 2705 bindservice = cp + 2; 2706 } else { 2707 #endif 2708 cp = strchr(bindhostname, ':'); 2709 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2710 *cp = '\0'; 2711 if (cp[1] != '\0') 2712 bindservice = cp + 1; 2713 if (cp == bindhostname) 2714 bindhostname = NULL; 2715 } 2716 #ifdef INET6 2717 } 2718 #endif 2719 } 2720 2721 memset(&hints, 0, sizeof(hints)); 2722 hints.ai_flags = AI_PASSIVE; 2723 hints.ai_family = af; 2724 hints.ai_socktype = SOCK_DGRAM; 2725 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2726 if (error) { 2727 logerror(gai_strerror(error)); 2728 errno = 0; 2729 die(0); 2730 } 2731 2732 /* Count max number of sockets we may open */ 2733 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2734 socks = malloc((maxs+1) * sizeof(int)); 2735 if (socks == NULL) { 2736 logerror("couldn't allocate memory for sockets"); 2737 die(0); 2738 } 2739 2740 *socks = 0; /* num of sockets counter at start of array */ 2741 s = socks + 1; 2742 for (r = res; r; r = r->ai_next) { 2743 int on = 1; 2744 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2745 if (*s < 0) { 2746 logerror("socket"); 2747 continue; 2748 } 2749 #ifdef INET6 2750 if (r->ai_family == AF_INET6) { 2751 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2752 (char *)&on, sizeof (on)) < 0) { 2753 logerror("setsockopt"); 2754 close(*s); 2755 continue; 2756 } 2757 } 2758 #endif 2759 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2760 (char *)&on, sizeof (on)) < 0) { 2761 logerror("setsockopt"); 2762 close(*s); 2763 continue; 2764 } 2765 /* 2766 * RFC 3164 recommends that client side message 2767 * should come from the privileged syslogd port. 2768 * 2769 * If the system administrator choose not to obey 2770 * this, we can skip the bind() step so that the 2771 * system will choose a port for us. 2772 */ 2773 if (!NoBind) { 2774 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2775 logerror("bind"); 2776 close(*s); 2777 continue; 2778 } 2779 2780 if (!SecureMode) 2781 increase_rcvbuf(*s); 2782 } 2783 2784 (*socks)++; 2785 dprintf("socksetup: new socket fd is %d\n", *s); 2786 s++; 2787 } 2788 2789 if (*socks == 0) { 2790 free(socks); 2791 if (Debug) 2792 return (NULL); 2793 else 2794 die(0); 2795 } 2796 if (res) 2797 freeaddrinfo(res); 2798 2799 return (socks); 2800 } 2801 2802 static void 2803 increase_rcvbuf(int fd) 2804 { 2805 socklen_t len, slen; 2806 2807 slen = sizeof(len); 2808 2809 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2810 if (len < RCVBUF_MINSIZE) { 2811 len = RCVBUF_MINSIZE; 2812 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2813 } 2814 } 2815 } 2816