syslogd.c revision 321234
12255Ssos/* 22255Ssos * Copyright (c) 1983, 1988, 1993, 1994 32255Ssos * The Regents of the University of California. All rights reserved. 42255Ssos * 52255Ssos * Redistribution and use in source and binary forms, with or without 62255Ssos * modification, are permitted provided that the following conditions 72255Ssos * are met: 82255Ssos * 1. Redistributions of source code must retain the above copyright 92255Ssos * notice, this list of conditions and the following disclaimer. 102255Ssos * 2. Redistributions in binary form must reproduce the above copyright 112255Ssos * notice, this list of conditions and the following disclaimer in the 122255Ssos * documentation and/or other materials provided with the distribution. 132255Ssos * 4. Neither the name of the University nor the names of its contributors 142255Ssos * may be used to endorse or promote products derived from this software 152255Ssos * without specific prior written permission. 162255Ssos * 172255Ssos * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 182255Ssos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 192255Ssos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 202255Ssos * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 212255Ssos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 222255Ssos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 232255Ssos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 242255Ssos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 252255Ssos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 262255Ssos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 272255Ssos * SUCH DAMAGE. 282255Ssos */ 292255Ssos 302255Ssos#ifndef lint 312255Ssosstatic const char copyright[] = 322255Ssos"@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 3314331Speter The Regents of the University of California. All rights reserved.\n"; 342255Ssos#endif /* not lint */ 352255Ssos 362255Ssos#ifndef lint 372255Ssos#if 0 382255Ssosstatic char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 3912453Sbde#endif 4010905Sbde#endif /* not lint */ 412255Ssos 422255Ssos#include <sys/cdefs.h> 4310905Sbde__FBSDID("$FreeBSD: stable/10/usr.sbin/syslogd/syslogd.c 321234 2017-07-19 19:30:13Z ngie $"); 442255Ssos 452255Ssos/* 4610905Sbde * syslogd -- log system messages 4714331Speter * 4810905Sbde * This program implements a system log. It takes a series of lines. 492255Ssos * Each line may have a priority, signified as "<n>" as 502255Ssos * the first characters of the line. If this is 512255Ssos * not present, a default priority is used. 522255Ssos * 533472Ssos * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 543472Ssos * cause it to reread its configuration file. 553472Ssos * 563472Ssos * Defined Constants: 5710905Sbde * 5810905Sbde * MAXLINE -- the maximum line length that can be handled. 5914331Speter * DEFUPRI -- the default priority for user messages 6014331Speter * DEFSPRI -- the default priority for kernel messages 6114331Speter * 6214331Speter * Author: Eric Allman 6314331Speter * extensive changes by Ralph Campbell 6414331Speter * more extensive changes by Eric Allman (again) 652255Ssos * Extension to log by program name as well as facility and priority 662255Ssos * by Peter da Silva. 672255Ssos * -u and -v by Harlan Stenn. 687090Sbde * Priority comparison code by Harlan Stenn. 692255Ssos */ 702255Ssos 712255Ssos/* Maximum number of characters in time of last occurrence */ 722255Ssos#define MAXDATELEN 16 732255Ssos#define MAXLINE 1024 /* maximum line length */ 742255Ssos#define MAXSVLINE MAXLINE /* maximum saved line length */ 75#define DEFUPRI (LOG_USER|LOG_NOTICE) 76#define DEFSPRI (LOG_KERN|LOG_CRIT) 77#define TIMERINTVL 30 /* interval for checking flush, mark */ 78#define TTYMSGTIME 1 /* timeout passed to ttymsg */ 79#define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 80 81#include <sys/param.h> 82#include <sys/ioctl.h> 83#include <sys/mman.h> 84#include <sys/queue.h> 85#include <sys/resource.h> 86#include <sys/socket.h> 87#include <sys/stat.h> 88#include <sys/syslimits.h> 89#include <sys/time.h> 90#include <sys/uio.h> 91#include <sys/un.h> 92#include <sys/wait.h> 93#include <sys/types.h> 94 95#include <netinet/in.h> 96#include <netdb.h> 97#include <arpa/inet.h> 98 99#include <ctype.h> 100#include <dirent.h> 101#include <err.h> 102#include <errno.h> 103#include <fcntl.h> 104#include <libutil.h> 105#include <limits.h> 106#include <paths.h> 107#include <signal.h> 108#include <stdio.h> 109#include <stdlib.h> 110#include <string.h> 111#include <sysexits.h> 112#include <unistd.h> 113#include <utmpx.h> 114 115#include "pathnames.h" 116#include "ttymsg.h" 117 118#define SYSLOG_NAMES 119#include <sys/syslog.h> 120 121const char *ConfFile = _PATH_LOGCONF; 122const char *PidFile = _PATH_LOGPID; 123const char ctty[] = _PATH_CONSOLE; 124static const char include_str[] = "include"; 125static const char include_ext[] = ".conf"; 126 127#define dprintf if (Debug) printf 128 129#define MAXUNAMES 20 /* maximum number of user names */ 130 131/* 132 * Unix sockets. 133 * We have two default sockets, one with 666 permissions, 134 * and one for privileged programs. 135 */ 136struct funix { 137 int s; 138 const char *name; 139 mode_t mode; 140 STAILQ_ENTRY(funix) next; 141}; 142struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 143 { NULL } }; 144struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 145 { &funix_secure } }; 146 147STAILQ_HEAD(, funix) funixes = { &funix_default, 148 &(funix_secure.next.stqe_next) }; 149 150/* 151 * Flags to logmsg(). 152 */ 153 154#define IGN_CONS 0x001 /* don't print on console */ 155#define SYNC_FILE 0x002 /* do fsync on file after printing */ 156#define ADDDATE 0x004 /* add a date to the message */ 157#define MARK 0x008 /* this message is a mark */ 158#define ISKERNEL 0x010 /* kernel generated message */ 159 160/* 161 * This structure represents the files that will have log 162 * copies printed. 163 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 164 * or if f_type if F_PIPE and f_pid > 0. 165 */ 166 167struct filed { 168 struct filed *f_next; /* next in linked list */ 169 short f_type; /* entry type, see below */ 170 short f_file; /* file descriptor */ 171 time_t f_time; /* time this was last written */ 172 char *f_host; /* host from which to recd. */ 173 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 174 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 175#define PRI_LT 0x1 176#define PRI_EQ 0x2 177#define PRI_GT 0x4 178 char *f_program; /* program this applies to */ 179 union { 180 char f_uname[MAXUNAMES][MAXLOGNAME]; 181 struct { 182 char f_hname[MAXHOSTNAMELEN]; 183 struct addrinfo *f_addr; 184 185 } f_forw; /* forwarding address */ 186 char f_fname[MAXPATHLEN]; 187 struct { 188 char f_pname[MAXPATHLEN]; 189 pid_t f_pid; 190 } f_pipe; 191 } f_un; 192 char f_prevline[MAXSVLINE]; /* last message logged */ 193 char f_lasttime[MAXDATELEN]; /* time of last occurrence */ 194 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 195 int f_prevpri; /* pri of f_prevline */ 196 int f_prevlen; /* length of f_prevline */ 197 int f_prevcount; /* repetition cnt of prevline */ 198 u_int f_repeatcount; /* number of "repeated" msgs */ 199 int f_flags; /* file-specific flags */ 200#define FFLAG_SYNC 0x01 201#define FFLAG_NEEDSYNC 0x02 202}; 203 204/* 205 * Queue of about-to-be dead processes we should watch out for. 206 */ 207 208TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 209struct stailhead *deadq_headp; 210 211struct deadq_entry { 212 pid_t dq_pid; 213 int dq_timeout; 214 TAILQ_ENTRY(deadq_entry) dq_entries; 215}; 216 217/* 218 * The timeout to apply to processes waiting on the dead queue. Unit 219 * of measure is `mark intervals', i.e. 20 minutes by default. 220 * Processes on the dead queue will be terminated after that time. 221 */ 222 223#define DQ_TIMO_INIT 2 224 225typedef struct deadq_entry *dq_t; 226 227 228/* 229 * Struct to hold records of network addresses that are allowed to log 230 * to us. 231 */ 232struct allowedpeer { 233 int isnumeric; 234 u_short port; 235 union { 236 struct { 237 struct sockaddr_storage addr; 238 struct sockaddr_storage mask; 239 } numeric; 240 char *name; 241 } u; 242#define a_addr u.numeric.addr 243#define a_mask u.numeric.mask 244#define a_name u.name 245}; 246 247 248/* 249 * Intervals at which we flush out "message repeated" messages, 250 * in seconds after previous message is logged. After each flush, 251 * we move to the next interval until we reach the largest. 252 */ 253int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 254#define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 255#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 256#define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 257 (f)->f_repeatcount = MAXREPEAT; \ 258 } 259 260/* values for f_type */ 261#define F_UNUSED 0 /* unused entry */ 262#define F_FILE 1 /* regular file */ 263#define F_TTY 2 /* terminal */ 264#define F_CONSOLE 3 /* console terminal */ 265#define F_FORW 4 /* remote machine */ 266#define F_USERS 5 /* list of users */ 267#define F_WALL 6 /* everyone logged on */ 268#define F_PIPE 7 /* pipe to program */ 269 270const char *TypeNames[8] = { 271 "UNUSED", "FILE", "TTY", "CONSOLE", 272 "FORW", "USERS", "WALL", "PIPE" 273}; 274 275static struct filed *Files; /* Log files that we write to */ 276static struct filed consfile; /* Console */ 277 278static int Debug; /* debug flag */ 279static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 280static int resolve = 1; /* resolve hostname */ 281static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 282static const char *LocalDomain; /* our local domain name */ 283static int *finet; /* Internet datagram socket */ 284static int fklog = -1; /* /dev/klog */ 285static int Initialized; /* set when we have initialized ourselves */ 286static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 287static int MarkSeq; /* mark sequence number */ 288static int NoBind; /* don't bind() as suggested by RFC 3164 */ 289static int SecureMode; /* when true, receive only unix domain socks */ 290#ifdef INET6 291static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 292#else 293static int family = PF_INET; /* protocol family (IPv4 only) */ 294#endif 295static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 296static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 297static int use_bootfile; /* log entire bootfile for every kern msg */ 298static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 299static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 300 301static char bootfile[MAXLINE+1]; /* booted kernel file */ 302 303struct allowedpeer *AllowedPeers; /* List of allowed peers */ 304static int NumAllowed; /* Number of entries in AllowedPeers */ 305static int RemoteAddDate; /* Always set the date on remote messages */ 306 307static int UniquePriority; /* Only log specified priority? */ 308static int LogFacPri; /* Put facility and priority in log message: */ 309 /* 0=no, 1=numeric, 2=names */ 310static int KeepKernFac; /* Keep remotely logged kernel facility */ 311static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 312static struct pidfh *pfh; 313 314volatile sig_atomic_t MarkSet, WantDie; 315 316static int allowaddr(char *); 317static void cfline(const char *, struct filed *, 318 const char *, const char *); 319static const char *cvthname(struct sockaddr *); 320static void deadq_enter(pid_t, const char *); 321static int deadq_remove(pid_t); 322static int decode(const char *, const CODE *); 323static void die(int); 324static void dodie(int); 325static void dofsync(void); 326static void domark(int); 327static void fprintlog(struct filed *, int, const char *); 328static int *socksetup(int, char *); 329static void init(int); 330static void logerror(const char *); 331static void logmsg(int, const char *, const char *, int); 332static void log_deadchild(pid_t, int, const char *); 333static void markit(void); 334static int skip_message(const char *, const char *, int); 335static void printline(const char *, char *, int); 336static void printsys(char *); 337static int p_open(const char *, pid_t *); 338static void readklog(void); 339static void reapchild(int); 340static void usage(void); 341static int validate(struct sockaddr *, const char *); 342static void unmapped(struct sockaddr *); 343static void wallmsg(struct filed *, struct iovec *, const int iovlen); 344static int waitdaemon(int, int, int); 345static void timedout(int); 346static void increase_rcvbuf(int); 347 348static void 349close_filed(struct filed *f) 350{ 351 352 if (f == NULL || f->f_file == -1) 353 return; 354 355 switch (f->f_type) { 356 case F_FILE: 357 case F_TTY: 358 case F_CONSOLE: 359 case F_FORW: 360 f->f_type = F_UNUSED; 361 break; 362 case F_PIPE: 363 f->f_un.f_pipe.f_pid = 0; 364 break; 365 } 366 (void)close(f->f_file); 367 f->f_file = -1; 368} 369 370int 371main(int argc, char *argv[]) 372{ 373 int ch, i, fdsrmax = 0, l; 374 struct sockaddr_un sunx, fromunix; 375 struct sockaddr_storage frominet; 376 fd_set *fdsr = NULL; 377 char line[MAXLINE + 1]; 378 char *bindhostname; 379 const char *hname; 380 struct timeval tv, *tvp; 381 struct sigaction sact; 382 struct funix *fx, *fx1; 383 sigset_t mask; 384 pid_t ppid = 1, spid; 385 socklen_t len; 386 387 if (madvise(NULL, 0, MADV_PROTECT) != 0) 388 dprintf("madvise() failed: %s\n", strerror(errno)); 389 390 bindhostname = NULL; 391 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 392 != -1) 393 switch (ch) { 394 case '4': 395 family = PF_INET; 396 break; 397#ifdef INET6 398 case '6': 399 family = PF_INET6; 400 break; 401#endif 402 case '8': 403 mask_C1 = 0; 404 break; 405 case 'A': 406 send_to_all++; 407 break; 408 case 'a': /* allow specific network addresses only */ 409 if (allowaddr(optarg) == -1) 410 usage(); 411 break; 412 case 'b': 413 bindhostname = optarg; 414 break; 415 case 'c': 416 no_compress++; 417 break; 418 case 'C': 419 logflags |= O_CREAT; 420 break; 421 case 'd': /* debug */ 422 Debug++; 423 break; 424 case 'f': /* configuration file */ 425 ConfFile = optarg; 426 break; 427 case 'F': /* run in foreground instead of daemon */ 428 Foreground++; 429 break; 430 case 'k': /* keep remote kern fac */ 431 KeepKernFac = 1; 432 break; 433 case 'l': 434 { 435 long perml; 436 mode_t mode; 437 char *name, *ep; 438 439 if (optarg[0] == '/') { 440 mode = DEFFILEMODE; 441 name = optarg; 442 } else if ((name = strchr(optarg, ':')) != NULL) { 443 *name++ = '\0'; 444 if (name[0] != '/') 445 errx(1, "socket name must be absolute " 446 "path"); 447 if (isdigit(*optarg)) { 448 perml = strtol(optarg, &ep, 8); 449 if (*ep || perml < 0 || 450 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 451 errx(1, "invalid mode %s, exiting", 452 optarg); 453 mode = (mode_t )perml; 454 } else 455 errx(1, "invalid mode %s, exiting", 456 optarg); 457 } else /* doesn't begin with '/', and no ':' */ 458 errx(1, "can't parse path %s", optarg); 459 460 if (strlen(name) >= sizeof(sunx.sun_path)) 461 errx(1, "%s path too long, exiting", name); 462 if ((fx = malloc(sizeof(struct funix))) == NULL) 463 errx(1, "malloc failed"); 464 fx->s = -1; 465 fx->name = name; 466 fx->mode = mode; 467 STAILQ_INSERT_TAIL(&funixes, fx, next); 468 break; 469 } 470 case 'm': /* mark interval */ 471 MarkInterval = atoi(optarg) * 60; 472 break; 473 case 'N': 474 NoBind = 1; 475 SecureMode = 1; 476 break; 477 case 'n': 478 resolve = 0; 479 break; 480 case 'o': 481 use_bootfile = 1; 482 break; 483 case 'p': /* path */ 484 if (strlen(optarg) >= sizeof(sunx.sun_path)) 485 errx(1, "%s path too long, exiting", optarg); 486 funix_default.name = optarg; 487 break; 488 case 'P': /* path for alt. PID */ 489 PidFile = optarg; 490 break; 491 case 's': /* no network mode */ 492 SecureMode++; 493 break; 494 case 'S': /* path for privileged originator */ 495 if (strlen(optarg) >= sizeof(sunx.sun_path)) 496 errx(1, "%s path too long, exiting", optarg); 497 funix_secure.name = optarg; 498 break; 499 case 'T': 500 RemoteAddDate = 1; 501 break; 502 case 'u': /* only log specified priority */ 503 UniquePriority++; 504 break; 505 case 'v': /* log facility and priority */ 506 LogFacPri++; 507 break; 508 default: 509 usage(); 510 } 511 if ((argc -= optind) != 0) 512 usage(); 513 514 pfh = pidfile_open(PidFile, 0600, &spid); 515 if (pfh == NULL) { 516 if (errno == EEXIST) 517 errx(1, "syslogd already running, pid: %d", spid); 518 warn("cannot open pid file"); 519 } 520 521 if ((!Foreground) && (!Debug)) { 522 ppid = waitdaemon(0, 0, 30); 523 if (ppid < 0) { 524 warn("could not become daemon"); 525 pidfile_remove(pfh); 526 exit(1); 527 } 528 } else if (Debug) { 529 setlinebuf(stdout); 530 } 531 532 if (NumAllowed) 533 endservent(); 534 535 consfile.f_type = F_CONSOLE; 536 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 537 sizeof(consfile.f_un.f_fname)); 538 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 539 (void)signal(SIGTERM, dodie); 540 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 541 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 542 /* 543 * We don't want the SIGCHLD and SIGHUP handlers to interfere 544 * with each other; they are likely candidates for being called 545 * simultaneously (SIGHUP closes pipe descriptor, process dies, 546 * SIGCHLD happens). 547 */ 548 sigemptyset(&mask); 549 sigaddset(&mask, SIGHUP); 550 sact.sa_handler = reapchild; 551 sact.sa_mask = mask; 552 sact.sa_flags = SA_RESTART; 553 (void)sigaction(SIGCHLD, &sact, NULL); 554 (void)signal(SIGALRM, domark); 555 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 556 (void)alarm(TIMERINTVL); 557 558 TAILQ_INIT(&deadq_head); 559 560#ifndef SUN_LEN 561#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 562#endif 563 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 564 (void)unlink(fx->name); 565 memset(&sunx, 0, sizeof(sunx)); 566 sunx.sun_family = AF_LOCAL; 567 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 568 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 569 if (fx->s < 0 || 570 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 571 chmod(fx->name, fx->mode) < 0) { 572 (void)snprintf(line, sizeof line, 573 "cannot create %s", fx->name); 574 logerror(line); 575 dprintf("cannot create %s (%d)\n", fx->name, errno); 576 if (fx == &funix_default || fx == &funix_secure) 577 die(0); 578 else { 579 STAILQ_REMOVE(&funixes, fx, funix, next); 580 continue; 581 } 582 } 583 increase_rcvbuf(fx->s); 584 } 585 if (SecureMode <= 1) 586 finet = socksetup(family, bindhostname); 587 588 if (finet) { 589 if (SecureMode) { 590 for (i = 0; i < *finet; i++) { 591 if (shutdown(finet[i+1], SHUT_RD) < 0 && 592 errno != ENOTCONN) { 593 logerror("shutdown"); 594 if (!Debug) 595 die(0); 596 } 597 } 598 } else { 599 dprintf("listening on inet and/or inet6 socket\n"); 600 } 601 dprintf("sending on inet and/or inet6 socket\n"); 602 } 603 604 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 605 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 606 fklog = -1; 607 if (fklog < 0) 608 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 609 610 /* tuck my process id away */ 611 pidfile_write(pfh); 612 613 dprintf("off & running....\n"); 614 615 init(0); 616 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 617 sigemptyset(&mask); 618 sigaddset(&mask, SIGCHLD); 619 sact.sa_handler = init; 620 sact.sa_mask = mask; 621 sact.sa_flags = SA_RESTART; 622 (void)sigaction(SIGHUP, &sact, NULL); 623 624 tvp = &tv; 625 tv.tv_sec = tv.tv_usec = 0; 626 627 if (fklog != -1 && fklog > fdsrmax) 628 fdsrmax = fklog; 629 if (finet && !SecureMode) { 630 for (i = 0; i < *finet; i++) { 631 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 632 fdsrmax = finet[i+1]; 633 } 634 } 635 STAILQ_FOREACH(fx, &funixes, next) 636 if (fx->s > fdsrmax) 637 fdsrmax = fx->s; 638 639 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 640 sizeof(fd_mask)); 641 if (fdsr == NULL) 642 errx(1, "calloc fd_set"); 643 644 for (;;) { 645 if (MarkSet) 646 markit(); 647 if (WantDie) 648 die(WantDie); 649 650 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 651 sizeof(fd_mask)); 652 653 if (fklog != -1) 654 FD_SET(fklog, fdsr); 655 if (finet && !SecureMode) { 656 for (i = 0; i < *finet; i++) { 657 if (finet[i+1] != -1) 658 FD_SET(finet[i+1], fdsr); 659 } 660 } 661 STAILQ_FOREACH(fx, &funixes, next) 662 FD_SET(fx->s, fdsr); 663 664 i = select(fdsrmax+1, fdsr, NULL, NULL, 665 needdofsync ? &tv : tvp); 666 switch (i) { 667 case 0: 668 dofsync(); 669 needdofsync = 0; 670 if (tvp) { 671 tvp = NULL; 672 if (ppid != 1) 673 kill(ppid, SIGALRM); 674 } 675 continue; 676 case -1: 677 if (errno != EINTR) 678 logerror("select"); 679 continue; 680 } 681 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 682 readklog(); 683 if (finet && !SecureMode) { 684 for (i = 0; i < *finet; i++) { 685 if (FD_ISSET(finet[i+1], fdsr)) { 686 len = sizeof(frominet); 687 l = recvfrom(finet[i+1], line, MAXLINE, 688 0, (struct sockaddr *)&frominet, 689 &len); 690 if (l > 0) { 691 line[l] = '\0'; 692 hname = cvthname((struct sockaddr *)&frominet); 693 unmapped((struct sockaddr *)&frominet); 694 if (validate((struct sockaddr *)&frominet, hname)) 695 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 696 } else if (l < 0 && errno != EINTR) 697 logerror("recvfrom inet"); 698 } 699 } 700 } 701 STAILQ_FOREACH(fx, &funixes, next) { 702 if (FD_ISSET(fx->s, fdsr)) { 703 len = sizeof(fromunix); 704 l = recvfrom(fx->s, line, MAXLINE, 0, 705 (struct sockaddr *)&fromunix, &len); 706 if (l > 0) { 707 line[l] = '\0'; 708 printline(LocalHostName, line, 0); 709 } else if (l < 0 && errno != EINTR) 710 logerror("recvfrom unix"); 711 } 712 } 713 } 714 if (fdsr) 715 free(fdsr); 716} 717 718static void 719unmapped(struct sockaddr *sa) 720{ 721 struct sockaddr_in6 *sin6; 722 struct sockaddr_in sin4; 723 724 if (sa->sa_family != AF_INET6) 725 return; 726 if (sa->sa_len != sizeof(struct sockaddr_in6) || 727 sizeof(sin4) > sa->sa_len) 728 return; 729 sin6 = (struct sockaddr_in6 *)sa; 730 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 731 return; 732 733 memset(&sin4, 0, sizeof(sin4)); 734 sin4.sin_family = AF_INET; 735 sin4.sin_len = sizeof(struct sockaddr_in); 736 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 737 sizeof(sin4.sin_addr)); 738 sin4.sin_port = sin6->sin6_port; 739 740 memcpy(sa, &sin4, sin4.sin_len); 741} 742 743static void 744usage(void) 745{ 746 747 fprintf(stderr, "%s\n%s\n%s\n%s\n", 748 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 749 " [-b bind_address] [-f config_file]", 750 " [-l [mode:]path] [-m mark_interval]", 751 " [-P pid_file] [-p log_socket]"); 752 exit(1); 753} 754 755/* 756 * Take a raw input line, decode the message, and print the message 757 * on the appropriate log files. 758 */ 759static void 760printline(const char *hname, char *msg, int flags) 761{ 762 char *p, *q; 763 long n; 764 int c, pri; 765 char line[MAXLINE + 1]; 766 767 /* test for special codes */ 768 p = msg; 769 pri = DEFUPRI; 770 if (*p == '<') { 771 errno = 0; 772 n = strtol(p + 1, &q, 10); 773 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 774 p = q + 1; 775 pri = n; 776 } 777 } 778 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 779 pri = DEFUPRI; 780 781 /* 782 * Don't allow users to log kernel messages. 783 * NOTE: since LOG_KERN == 0 this will also match 784 * messages with no facility specified. 785 */ 786 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 787 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 788 789 q = line; 790 791 while ((c = (unsigned char)*p++) != '\0' && 792 q < &line[sizeof(line) - 4]) { 793 if (mask_C1 && (c & 0x80) && c < 0xA0) { 794 c &= 0x7F; 795 *q++ = 'M'; 796 *q++ = '-'; 797 } 798 if (isascii(c) && iscntrl(c)) { 799 if (c == '\n') { 800 *q++ = ' '; 801 } else if (c == '\t') { 802 *q++ = '\t'; 803 } else { 804 *q++ = '^'; 805 *q++ = c ^ 0100; 806 } 807 } else { 808 *q++ = c; 809 } 810 } 811 *q = '\0'; 812 813 logmsg(pri, line, hname, flags); 814} 815 816/* 817 * Read /dev/klog while data are available, split into lines. 818 */ 819static void 820readklog(void) 821{ 822 char *p, *q, line[MAXLINE + 1]; 823 int len, i; 824 825 len = 0; 826 for (;;) { 827 i = read(fklog, line + len, MAXLINE - 1 - len); 828 if (i > 0) { 829 line[i + len] = '\0'; 830 } else { 831 if (i < 0 && errno != EINTR && errno != EAGAIN) { 832 logerror("klog"); 833 fklog = -1; 834 } 835 break; 836 } 837 838 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 839 *q = '\0'; 840 printsys(p); 841 } 842 len = strlen(p); 843 if (len >= MAXLINE - 1) { 844 printsys(p); 845 len = 0; 846 } 847 if (len > 0) 848 memmove(line, p, len + 1); 849 } 850 if (len > 0) 851 printsys(line); 852} 853 854/* 855 * Take a raw input line from /dev/klog, format similar to syslog(). 856 */ 857static void 858printsys(char *msg) 859{ 860 char *p, *q; 861 long n; 862 int flags, isprintf, pri; 863 864 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 865 p = msg; 866 pri = DEFSPRI; 867 isprintf = 1; 868 if (*p == '<') { 869 errno = 0; 870 n = strtol(p + 1, &q, 10); 871 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 872 p = q + 1; 873 pri = n; 874 isprintf = 0; 875 } 876 } 877 /* 878 * Kernel printf's and LOG_CONSOLE messages have been displayed 879 * on the console already. 880 */ 881 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 882 flags |= IGN_CONS; 883 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 884 pri = DEFSPRI; 885 logmsg(pri, p, LocalHostName, flags); 886} 887 888static time_t now; 889 890/* 891 * Match a program or host name against a specification. 892 * Return a non-0 value if the message must be ignored 893 * based on the specification. 894 */ 895static int 896skip_message(const char *name, const char *spec, int checkcase) 897{ 898 const char *s; 899 char prev, next; 900 int exclude = 0; 901 /* Behaviour on explicit match */ 902 903 if (spec == NULL) 904 return 0; 905 switch (*spec) { 906 case '-': 907 exclude = 1; 908 /*FALLTHROUGH*/ 909 case '+': 910 spec++; 911 break; 912 default: 913 break; 914 } 915 if (checkcase) 916 s = strstr (spec, name); 917 else 918 s = strcasestr (spec, name); 919 920 if (s != NULL) { 921 prev = (s == spec ? ',' : *(s - 1)); 922 next = *(s + strlen (name)); 923 924 if (prev == ',' && (next == '\0' || next == ',')) 925 /* Explicit match: skip iff the spec is an 926 exclusive one. */ 927 return exclude; 928 } 929 930 /* No explicit match for this name: skip the message iff 931 the spec is an inclusive one. */ 932 return !exclude; 933} 934 935/* 936 * Log a message to the appropriate log files, users, etc. based on 937 * the priority. 938 */ 939static void 940logmsg(int pri, const char *msg, const char *from, int flags) 941{ 942 struct filed *f; 943 int i, fac, msglen, omask, prilev; 944 const char *timestamp; 945 char prog[NAME_MAX+1]; 946 char buf[MAXLINE+1]; 947 948 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 949 pri, flags, from, msg); 950 951 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 952 953 /* 954 * Check to see if msg looks non-standard. 955 */ 956 msglen = strlen(msg); 957 if (msglen < MAXDATELEN || msg[3] != ' ' || msg[6] != ' ' || 958 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 959 flags |= ADDDATE; 960 961 (void)time(&now); 962 if (flags & ADDDATE) { 963 timestamp = ctime(&now) + 4; 964 } else { 965 timestamp = msg; 966 msg += MAXDATELEN; 967 msglen -= MAXDATELEN; 968 } 969 970 /* skip leading blanks */ 971 while (isspace(*msg)) { 972 msg++; 973 msglen--; 974 } 975 976 /* extract facility and priority level */ 977 if (flags & MARK) 978 fac = LOG_NFACILITIES; 979 else 980 fac = LOG_FAC(pri); 981 982 /* Check maximum facility number. */ 983 if (fac > LOG_NFACILITIES) { 984 (void)sigsetmask(omask); 985 return; 986 } 987 988 prilev = LOG_PRI(pri); 989 990 /* extract program name */ 991 for (i = 0; i < NAME_MAX; i++) { 992 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 993 msg[i] == '/' || isspace(msg[i])) 994 break; 995 prog[i] = msg[i]; 996 } 997 prog[i] = 0; 998 999 /* add kernel prefix for kernel messages */ 1000 if (flags & ISKERNEL) { 1001 snprintf(buf, sizeof(buf), "%s: %s", 1002 use_bootfile ? bootfile : "kernel", msg); 1003 msg = buf; 1004 msglen = strlen(buf); 1005 } 1006 1007 /* log the message to the particular outputs */ 1008 if (!Initialized) { 1009 f = &consfile; 1010 /* 1011 * Open in non-blocking mode to avoid hangs during open 1012 * and close(waiting for the port to drain). 1013 */ 1014 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1015 1016 if (f->f_file >= 0) { 1017 (void)strlcpy(f->f_lasttime, timestamp, 1018 sizeof(f->f_lasttime)); 1019 fprintlog(f, flags, msg); 1020 close(f->f_file); 1021 f->f_file = -1; 1022 } 1023 (void)sigsetmask(omask); 1024 return; 1025 } 1026 for (f = Files; f; f = f->f_next) { 1027 /* skip messages that are incorrect priority */ 1028 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1029 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1030 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1031 ) 1032 || f->f_pmask[fac] == INTERNAL_NOPRI) 1033 continue; 1034 1035 /* skip messages with the incorrect hostname */ 1036 if (skip_message(from, f->f_host, 0)) 1037 continue; 1038 1039 /* skip messages with the incorrect program name */ 1040 if (skip_message(prog, f->f_program, 1)) 1041 continue; 1042 1043 /* skip message to console if it has already been printed */ 1044 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1045 continue; 1046 1047 /* don't output marks to recently written files */ 1048 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1049 continue; 1050 1051 /* 1052 * suppress duplicate lines to this file 1053 */ 1054 if (no_compress - (f->f_type != F_PIPE) < 1 && 1055 (flags & MARK) == 0 && msglen == f->f_prevlen && 1056 !strcmp(msg, f->f_prevline) && 1057 !strcasecmp(from, f->f_prevhost)) { 1058 (void)strlcpy(f->f_lasttime, timestamp, 1059 sizeof(f->f_lasttime)); 1060 f->f_prevcount++; 1061 dprintf("msg repeated %d times, %ld sec of %d\n", 1062 f->f_prevcount, (long)(now - f->f_time), 1063 repeatinterval[f->f_repeatcount]); 1064 /* 1065 * If domark would have logged this by now, 1066 * flush it now (so we don't hold isolated messages), 1067 * but back off so we'll flush less often 1068 * in the future. 1069 */ 1070 if (now > REPEATTIME(f)) { 1071 fprintlog(f, flags, (char *)NULL); 1072 BACKOFF(f); 1073 } 1074 } else { 1075 /* new line, save it */ 1076 if (f->f_prevcount) 1077 fprintlog(f, 0, (char *)NULL); 1078 f->f_repeatcount = 0; 1079 f->f_prevpri = pri; 1080 (void)strlcpy(f->f_lasttime, timestamp, 1081 sizeof(f->f_lasttime)); 1082 (void)strlcpy(f->f_prevhost, from, 1083 sizeof(f->f_prevhost)); 1084 if (msglen < MAXSVLINE) { 1085 f->f_prevlen = msglen; 1086 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1087 fprintlog(f, flags, (char *)NULL); 1088 } else { 1089 f->f_prevline[0] = 0; 1090 f->f_prevlen = 0; 1091 fprintlog(f, flags, msg); 1092 } 1093 } 1094 } 1095 (void)sigsetmask(omask); 1096} 1097 1098static void 1099dofsync(void) 1100{ 1101 struct filed *f; 1102 1103 for (f = Files; f; f = f->f_next) { 1104 if ((f->f_type == F_FILE) && 1105 (f->f_flags & FFLAG_NEEDSYNC)) { 1106 f->f_flags &= ~FFLAG_NEEDSYNC; 1107 (void)fsync(f->f_file); 1108 } 1109 } 1110} 1111 1112#define IOV_SIZE 7 1113static void 1114fprintlog(struct filed *f, int flags, const char *msg) 1115{ 1116 struct iovec iov[IOV_SIZE]; 1117 struct iovec *v; 1118 struct addrinfo *r; 1119 int i, l, lsent = 0; 1120 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1121 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1122 const char *msgret; 1123 1124 v = iov; 1125 if (f->f_type == F_WALL) { 1126 v->iov_base = greetings; 1127 /* The time displayed is not synchornized with the other log 1128 * destinations (like messages). Following fragment was using 1129 * ctime(&now), which was updating the time every 30 sec. 1130 * With f_lasttime, time is synchronized correctly. 1131 */ 1132 v->iov_len = snprintf(greetings, sizeof greetings, 1133 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1134 f->f_prevhost, f->f_lasttime); 1135 if (v->iov_len >= sizeof greetings) 1136 v->iov_len = sizeof greetings - 1; 1137 v++; 1138 v->iov_base = nul; 1139 v->iov_len = 0; 1140 v++; 1141 } else { 1142 v->iov_base = f->f_lasttime; 1143 v->iov_len = strlen(f->f_lasttime); 1144 v++; 1145 v->iov_base = space; 1146 v->iov_len = 1; 1147 v++; 1148 } 1149 1150 if (LogFacPri) { 1151 static char fp_buf[30]; /* Hollow laugh */ 1152 int fac = f->f_prevpri & LOG_FACMASK; 1153 int pri = LOG_PRI(f->f_prevpri); 1154 const char *f_s = NULL; 1155 char f_n[5]; /* Hollow laugh */ 1156 const char *p_s = NULL; 1157 char p_n[5]; /* Hollow laugh */ 1158 1159 if (LogFacPri > 1) { 1160 const CODE *c; 1161 1162 for (c = facilitynames; c->c_name; c++) { 1163 if (c->c_val == fac) { 1164 f_s = c->c_name; 1165 break; 1166 } 1167 } 1168 for (c = prioritynames; c->c_name; c++) { 1169 if (c->c_val == pri) { 1170 p_s = c->c_name; 1171 break; 1172 } 1173 } 1174 } 1175 if (!f_s) { 1176 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1177 f_s = f_n; 1178 } 1179 if (!p_s) { 1180 snprintf(p_n, sizeof p_n, "%d", pri); 1181 p_s = p_n; 1182 } 1183 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1184 v->iov_base = fp_buf; 1185 v->iov_len = strlen(fp_buf); 1186 } else { 1187 v->iov_base = nul; 1188 v->iov_len = 0; 1189 } 1190 v++; 1191 1192 v->iov_base = f->f_prevhost; 1193 v->iov_len = strlen(v->iov_base); 1194 v++; 1195 v->iov_base = space; 1196 v->iov_len = 1; 1197 v++; 1198 1199 if (msg) { 1200 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1201 if (wmsg == NULL) { 1202 logerror("strdup"); 1203 exit(1); 1204 } 1205 v->iov_base = wmsg; 1206 v->iov_len = strlen(msg); 1207 } else if (f->f_prevcount > 1) { 1208 v->iov_base = repbuf; 1209 v->iov_len = snprintf(repbuf, sizeof repbuf, 1210 "last message repeated %d times", f->f_prevcount); 1211 } else { 1212 v->iov_base = f->f_prevline; 1213 v->iov_len = f->f_prevlen; 1214 } 1215 v++; 1216 1217 dprintf("Logging to %s", TypeNames[f->f_type]); 1218 f->f_time = now; 1219 1220 switch (f->f_type) { 1221 int port; 1222 case F_UNUSED: 1223 dprintf("\n"); 1224 break; 1225 1226 case F_FORW: 1227 port = (int)ntohs(((struct sockaddr_in *) 1228 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1229 if (port != 514) { 1230 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1231 } else { 1232 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1233 } 1234 /* check for local vs remote messages */ 1235 if (strcasecmp(f->f_prevhost, LocalHostName)) 1236 l = snprintf(line, sizeof line - 1, 1237 "<%d>%.15s Forwarded from %s: %s", 1238 f->f_prevpri, (char *)iov[0].iov_base, 1239 f->f_prevhost, (char *)iov[5].iov_base); 1240 else 1241 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1242 f->f_prevpri, (char *)iov[0].iov_base, 1243 (char *)iov[5].iov_base); 1244 if (l < 0) 1245 l = 0; 1246 else if (l > MAXLINE) 1247 l = MAXLINE; 1248 1249 if (finet) { 1250 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1251 for (i = 0; i < *finet; i++) { 1252#if 0 1253 /* 1254 * should we check AF first, or just 1255 * trial and error? FWD 1256 */ 1257 if (r->ai_family == 1258 address_family_of(finet[i+1])) 1259#endif 1260 lsent = sendto(finet[i+1], line, l, 0, 1261 r->ai_addr, r->ai_addrlen); 1262 if (lsent == l) 1263 break; 1264 } 1265 if (lsent == l && !send_to_all) 1266 break; 1267 } 1268 dprintf("lsent/l: %d/%d\n", lsent, l); 1269 if (lsent != l) { 1270 int e = errno; 1271 logerror("sendto"); 1272 errno = e; 1273 switch (errno) { 1274 case ENOBUFS: 1275 case ENETDOWN: 1276 case ENETUNREACH: 1277 case EHOSTUNREACH: 1278 case EHOSTDOWN: 1279 case EADDRNOTAVAIL: 1280 break; 1281 /* case EBADF: */ 1282 /* case EACCES: */ 1283 /* case ENOTSOCK: */ 1284 /* case EFAULT: */ 1285 /* case EMSGSIZE: */ 1286 /* case EAGAIN: */ 1287 /* case ENOBUFS: */ 1288 /* case ECONNREFUSED: */ 1289 default: 1290 dprintf("removing entry: errno=%d\n", e); 1291 f->f_type = F_UNUSED; 1292 break; 1293 } 1294 } 1295 } 1296 break; 1297 1298 case F_FILE: 1299 dprintf(" %s\n", f->f_un.f_fname); 1300 v->iov_base = lf; 1301 v->iov_len = 1; 1302 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1303 /* 1304 * If writev(2) fails for potentially transient errors 1305 * like the filesystem being full, ignore it. 1306 * Otherwise remove this logfile from the list. 1307 */ 1308 if (errno != ENOSPC) { 1309 int e = errno; 1310 close_filed(f); 1311 errno = e; 1312 logerror(f->f_un.f_fname); 1313 } 1314 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1315 f->f_flags |= FFLAG_NEEDSYNC; 1316 needdofsync = 1; 1317 } 1318 break; 1319 1320 case F_PIPE: 1321 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1322 v->iov_base = lf; 1323 v->iov_len = 1; 1324 if (f->f_un.f_pipe.f_pid == 0) { 1325 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1326 &f->f_un.f_pipe.f_pid)) < 0) { 1327 logerror(f->f_un.f_pipe.f_pname); 1328 break; 1329 } 1330 } 1331 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1332 int e = errno; 1333 1334 close_filed(f); 1335 deadq_enter(f->f_un.f_pipe.f_pid, 1336 f->f_un.f_pipe.f_pname); 1337 errno = e; 1338 logerror(f->f_un.f_pipe.f_pname); 1339 } 1340 break; 1341 1342 case F_CONSOLE: 1343 if (flags & IGN_CONS) { 1344 dprintf(" (ignored)\n"); 1345 break; 1346 } 1347 /* FALLTHROUGH */ 1348 1349 case F_TTY: 1350 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1351 v->iov_base = crlf; 1352 v->iov_len = 2; 1353 1354 errno = 0; /* ttymsg() only sometimes returns an errno */ 1355 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1356 f->f_type = F_UNUSED; 1357 logerror(msgret); 1358 } 1359 break; 1360 1361 case F_USERS: 1362 case F_WALL: 1363 dprintf("\n"); 1364 v->iov_base = crlf; 1365 v->iov_len = 2; 1366 wallmsg(f, iov, IOV_SIZE); 1367 break; 1368 } 1369 f->f_prevcount = 0; 1370 free(wmsg); 1371} 1372 1373/* 1374 * WALLMSG -- Write a message to the world at large 1375 * 1376 * Write the specified message to either the entire 1377 * world, or a list of approved users. 1378 */ 1379static void 1380wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1381{ 1382 static int reenter; /* avoid calling ourselves */ 1383 struct utmpx *ut; 1384 int i; 1385 const char *p; 1386 1387 if (reenter++) 1388 return; 1389 setutxent(); 1390 /* NOSTRICT */ 1391 while ((ut = getutxent()) != NULL) { 1392 if (ut->ut_type != USER_PROCESS) 1393 continue; 1394 if (f->f_type == F_WALL) { 1395 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1396 TTYMSGTIME)) != NULL) { 1397 errno = 0; /* already in msg */ 1398 logerror(p); 1399 } 1400 continue; 1401 } 1402 /* should we send the message to this user? */ 1403 for (i = 0; i < MAXUNAMES; i++) { 1404 if (!f->f_un.f_uname[i][0]) 1405 break; 1406 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1407 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1408 TTYMSGTIME)) != NULL) { 1409 errno = 0; /* already in msg */ 1410 logerror(p); 1411 } 1412 break; 1413 } 1414 } 1415 } 1416 endutxent(); 1417 reenter = 0; 1418} 1419 1420static void 1421reapchild(int signo __unused) 1422{ 1423 int status; 1424 pid_t pid; 1425 struct filed *f; 1426 1427 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1428 if (!Initialized) 1429 /* Don't tell while we are initting. */ 1430 continue; 1431 1432 /* First, look if it's a process from the dead queue. */ 1433 if (deadq_remove(pid)) 1434 goto oncemore; 1435 1436 /* Now, look in list of active processes. */ 1437 for (f = Files; f; f = f->f_next) 1438 if (f->f_type == F_PIPE && 1439 f->f_un.f_pipe.f_pid == pid) { 1440 close_filed(f); 1441 log_deadchild(pid, status, 1442 f->f_un.f_pipe.f_pname); 1443 break; 1444 } 1445 oncemore: 1446 continue; 1447 } 1448} 1449 1450/* 1451 * Return a printable representation of a host address. 1452 */ 1453static const char * 1454cvthname(struct sockaddr *f) 1455{ 1456 int error, hl; 1457 sigset_t omask, nmask; 1458 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1459 1460 error = getnameinfo((struct sockaddr *)f, 1461 ((struct sockaddr *)f)->sa_len, 1462 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1463 dprintf("cvthname(%s)\n", ip); 1464 1465 if (error) { 1466 dprintf("Malformed from address %s\n", gai_strerror(error)); 1467 return ("???"); 1468 } 1469 if (!resolve) 1470 return (ip); 1471 1472 sigemptyset(&nmask); 1473 sigaddset(&nmask, SIGHUP); 1474 sigprocmask(SIG_BLOCK, &nmask, &omask); 1475 error = getnameinfo((struct sockaddr *)f, 1476 ((struct sockaddr *)f)->sa_len, 1477 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1478 sigprocmask(SIG_SETMASK, &omask, NULL); 1479 if (error) { 1480 dprintf("Host name for your address (%s) unknown\n", ip); 1481 return (ip); 1482 } 1483 hl = strlen(hname); 1484 if (hl > 0 && hname[hl-1] == '.') 1485 hname[--hl] = '\0'; 1486 trimdomain(hname, hl); 1487 return (hname); 1488} 1489 1490static void 1491dodie(int signo) 1492{ 1493 1494 WantDie = signo; 1495} 1496 1497static void 1498domark(int signo __unused) 1499{ 1500 1501 MarkSet = 1; 1502} 1503 1504/* 1505 * Print syslogd errors some place. 1506 */ 1507static void 1508logerror(const char *type) 1509{ 1510 char buf[512]; 1511 static int recursed = 0; 1512 1513 /* If there's an error while trying to log an error, give up. */ 1514 if (recursed) 1515 return; 1516 recursed++; 1517 if (errno) 1518 (void)snprintf(buf, 1519 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1520 else 1521 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1522 errno = 0; 1523 dprintf("%s\n", buf); 1524 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1525 recursed--; 1526} 1527 1528static void 1529die(int signo) 1530{ 1531 struct filed *f; 1532 struct funix *fx; 1533 int was_initialized; 1534 char buf[100]; 1535 1536 was_initialized = Initialized; 1537 Initialized = 0; /* Don't log SIGCHLDs. */ 1538 for (f = Files; f != NULL; f = f->f_next) { 1539 /* flush any pending output */ 1540 if (f->f_prevcount) 1541 fprintlog(f, 0, (char *)NULL); 1542 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) 1543 close_filed(f); 1544 } 1545 Initialized = was_initialized; 1546 if (signo) { 1547 dprintf("syslogd: exiting on signal %d\n", signo); 1548 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1549 errno = 0; 1550 logerror(buf); 1551 } 1552 STAILQ_FOREACH(fx, &funixes, next) 1553 (void)unlink(fx->name); 1554 pidfile_remove(pfh); 1555 1556 exit(1); 1557} 1558 1559static int 1560configfiles(const struct dirent *dp) 1561{ 1562 const char *p; 1563 size_t ext_len; 1564 1565 if (dp->d_name[0] == '.') 1566 return (0); 1567 1568 ext_len = sizeof(include_ext) -1; 1569 1570 if (dp->d_namlen <= ext_len) 1571 return (0); 1572 1573 p = &dp->d_name[dp->d_namlen - ext_len]; 1574 if (strcmp(p, include_ext) != 0) 1575 return (0); 1576 1577 return (1); 1578} 1579 1580static void 1581readconfigfile(FILE *cf, struct filed **nextp, int allow_includes) 1582{ 1583 FILE *cf2; 1584 struct filed *f; 1585 struct dirent **ent; 1586 char cline[LINE_MAX]; 1587 char host[MAXHOSTNAMELEN]; 1588 char prog[LINE_MAX]; 1589 char file[MAXPATHLEN]; 1590 char *p, *tmp; 1591 int i, nents; 1592 size_t include_len; 1593 1594 /* 1595 * Foreach line in the conf table, open that file. 1596 */ 1597 f = NULL; 1598 include_len = sizeof(include_str) -1; 1599 (void)strlcpy(host, "*", sizeof(host)); 1600 (void)strlcpy(prog, "*", sizeof(prog)); 1601 while (fgets(cline, sizeof(cline), cf) != NULL) { 1602 /* 1603 * check for end-of-section, comments, strip off trailing 1604 * spaces and newline character. #!prog is treated specially: 1605 * following lines apply only to that program. 1606 */ 1607 for (p = cline; isspace(*p); ++p) 1608 continue; 1609 if (*p == 0) 1610 continue; 1611 if (allow_includes && 1612 strncmp(p, include_str, include_len) == 0 && 1613 isspace(p[include_len])) { 1614 p += include_len; 1615 while (isspace(*p)) 1616 p++; 1617 tmp = p; 1618 while (*tmp != '\0' && !isspace(*tmp)) 1619 tmp++; 1620 *tmp = '\0'; 1621 dprintf("Trying to include files in '%s'\n", p); 1622 nents = scandir(p, &ent, configfiles, alphasort); 1623 if (nents == -1) { 1624 dprintf("Unable to open '%s': %s\n", p, 1625 strerror(errno)); 1626 continue; 1627 } 1628 for (i = 0; i < nents; i++) { 1629 if (snprintf(file, sizeof(file), "%s/%s", p, 1630 ent[i]->d_name) >= (int)sizeof(file)) { 1631 dprintf("ignoring path too long: " 1632 "'%s/%s'\n", p, ent[i]->d_name); 1633 free(ent[i]); 1634 continue; 1635 } 1636 free(ent[i]); 1637 cf2 = fopen(file, "r"); 1638 if (cf2 == NULL) 1639 continue; 1640 dprintf("reading %s\n", file); 1641 readconfigfile(cf2, nextp, 0); 1642 fclose(cf2); 1643 } 1644 free(ent); 1645 continue; 1646 } 1647 if (*p == '#') { 1648 p++; 1649 if (*p != '!' && *p != '+' && *p != '-') 1650 continue; 1651 } 1652 if (*p == '+' || *p == '-') { 1653 host[0] = *p++; 1654 while (isspace(*p)) 1655 p++; 1656 if ((!*p) || (*p == '*')) { 1657 (void)strlcpy(host, "*", sizeof(host)); 1658 continue; 1659 } 1660 if (*p == '@') 1661 p = LocalHostName; 1662 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1663 if (!isalnum(*p) && *p != '.' && *p != '-' 1664 && *p != ',' && *p != ':' && *p != '%') 1665 break; 1666 host[i] = *p++; 1667 } 1668 host[i] = '\0'; 1669 continue; 1670 } 1671 if (*p == '!') { 1672 p++; 1673 while (isspace(*p)) p++; 1674 if ((!*p) || (*p == '*')) { 1675 (void)strlcpy(prog, "*", sizeof(prog)); 1676 continue; 1677 } 1678 for (i = 0; i < LINE_MAX - 1; i++) { 1679 if (!isprint(p[i]) || isspace(p[i])) 1680 break; 1681 prog[i] = p[i]; 1682 } 1683 prog[i] = 0; 1684 continue; 1685 } 1686 for (p = cline + 1; *p != '\0'; p++) { 1687 if (*p != '#') 1688 continue; 1689 if (*(p - 1) == '\\') { 1690 strcpy(p - 1, p); 1691 p--; 1692 continue; 1693 } 1694 *p = '\0'; 1695 break; 1696 } 1697 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1698 cline[i] = '\0'; 1699 f = (struct filed *)calloc(1, sizeof(*f)); 1700 if (f == NULL) { 1701 logerror("calloc"); 1702 exit(1); 1703 } 1704 *nextp = f; 1705 nextp = &f->f_next; 1706 cfline(cline, f, prog, host); 1707 } 1708} 1709 1710/* 1711 * INIT -- Initialize syslogd from configuration table 1712 */ 1713static void 1714init(int signo) 1715{ 1716 int i; 1717 FILE *cf; 1718 struct filed *f, *next, **nextp; 1719 char *p; 1720 char oldLocalHostName[MAXHOSTNAMELEN]; 1721 char hostMsg[2*MAXHOSTNAMELEN+40]; 1722 char bootfileMsg[LINE_MAX]; 1723 1724 dprintf("init\n"); 1725 1726 /* 1727 * Load hostname (may have changed). 1728 */ 1729 if (signo != 0) 1730 (void)strlcpy(oldLocalHostName, LocalHostName, 1731 sizeof(oldLocalHostName)); 1732 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1733 err(EX_OSERR, "gethostname() failed"); 1734 if ((p = strchr(LocalHostName, '.')) != NULL) { 1735 *p++ = '\0'; 1736 LocalDomain = p; 1737 } else { 1738 LocalDomain = ""; 1739 } 1740 1741 /* 1742 * Close all open log files. 1743 */ 1744 Initialized = 0; 1745 for (f = Files; f != NULL; f = next) { 1746 /* flush any pending output */ 1747 if (f->f_prevcount) 1748 fprintlog(f, 0, (char *)NULL); 1749 1750 switch (f->f_type) { 1751 case F_FILE: 1752 case F_FORW: 1753 case F_CONSOLE: 1754 case F_TTY: 1755 close_filed(f); 1756 break; 1757 case F_PIPE: 1758 close_filed(f); 1759 deadq_enter(f->f_un.f_pipe.f_pid, 1760 f->f_un.f_pipe.f_pname); 1761 break; 1762 } 1763 next = f->f_next; 1764 if (f->f_program) free(f->f_program); 1765 if (f->f_host) free(f->f_host); 1766 free((char *)f); 1767 } 1768 Files = NULL; 1769 nextp = &Files; 1770 1771 /* open the configuration file */ 1772 if ((cf = fopen(ConfFile, "r")) == NULL) { 1773 dprintf("cannot open %s\n", ConfFile); 1774 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1775 if (*nextp == NULL) { 1776 logerror("calloc"); 1777 exit(1); 1778 } 1779 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1780 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1781 if ((*nextp)->f_next == NULL) { 1782 logerror("calloc"); 1783 exit(1); 1784 } 1785 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1786 Initialized = 1; 1787 return; 1788 } 1789 1790 readconfigfile(cf, &Files, 1); 1791 1792 /* close the configuration file */ 1793 (void)fclose(cf); 1794 1795 Initialized = 1; 1796 1797 if (Debug) { 1798 int port; 1799 for (f = Files; f; f = f->f_next) { 1800 for (i = 0; i <= LOG_NFACILITIES; i++) 1801 if (f->f_pmask[i] == INTERNAL_NOPRI) 1802 printf("X "); 1803 else 1804 printf("%d ", f->f_pmask[i]); 1805 printf("%s: ", TypeNames[f->f_type]); 1806 switch (f->f_type) { 1807 case F_FILE: 1808 printf("%s", f->f_un.f_fname); 1809 break; 1810 1811 case F_CONSOLE: 1812 case F_TTY: 1813 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1814 break; 1815 1816 case F_FORW: 1817 port = (int)ntohs(((struct sockaddr_in *) 1818 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1819 if (port != 514) { 1820 printf("%s:%d", 1821 f->f_un.f_forw.f_hname, port); 1822 } else { 1823 printf("%s", f->f_un.f_forw.f_hname); 1824 } 1825 break; 1826 1827 case F_PIPE: 1828 printf("%s", f->f_un.f_pipe.f_pname); 1829 break; 1830 1831 case F_USERS: 1832 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1833 printf("%s, ", f->f_un.f_uname[i]); 1834 break; 1835 } 1836 if (f->f_program) 1837 printf(" (%s)", f->f_program); 1838 printf("\n"); 1839 } 1840 } 1841 1842 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1843 dprintf("syslogd: restarted\n"); 1844 /* 1845 * Log a change in hostname, but only on a restart. 1846 */ 1847 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1848 (void)snprintf(hostMsg, sizeof(hostMsg), 1849 "syslogd: hostname changed, \"%s\" to \"%s\"", 1850 oldLocalHostName, LocalHostName); 1851 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1852 dprintf("%s\n", hostMsg); 1853 } 1854 /* 1855 * Log the kernel boot file if we aren't going to use it as 1856 * the prefix, and if this is *not* a restart. 1857 */ 1858 if (signo == 0 && !use_bootfile) { 1859 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1860 "syslogd: kernel boot file is %s", bootfile); 1861 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1862 dprintf("%s\n", bootfileMsg); 1863 } 1864} 1865 1866/* 1867 * Crack a configuration file line 1868 */ 1869static void 1870cfline(const char *line, struct filed *f, const char *prog, const char *host) 1871{ 1872 struct addrinfo hints, *res; 1873 int error, i, pri, syncfile; 1874 const char *p, *q; 1875 char *bp; 1876 char buf[MAXLINE], ebuf[100]; 1877 1878 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1879 1880 errno = 0; /* keep strerror() stuff out of logerror messages */ 1881 1882 /* clear out file entry */ 1883 memset(f, 0, sizeof(*f)); 1884 for (i = 0; i <= LOG_NFACILITIES; i++) 1885 f->f_pmask[i] = INTERNAL_NOPRI; 1886 1887 /* save hostname if any */ 1888 if (host && *host == '*') 1889 host = NULL; 1890 if (host) { 1891 int hl; 1892 1893 f->f_host = strdup(host); 1894 if (f->f_host == NULL) { 1895 logerror("strdup"); 1896 exit(1); 1897 } 1898 hl = strlen(f->f_host); 1899 if (hl > 0 && f->f_host[hl-1] == '.') 1900 f->f_host[--hl] = '\0'; 1901 trimdomain(f->f_host, hl); 1902 } 1903 1904 /* save program name if any */ 1905 if (prog && *prog == '*') 1906 prog = NULL; 1907 if (prog) { 1908 f->f_program = strdup(prog); 1909 if (f->f_program == NULL) { 1910 logerror("strdup"); 1911 exit(1); 1912 } 1913 } 1914 1915 /* scan through the list of selectors */ 1916 for (p = line; *p && *p != '\t' && *p != ' ';) { 1917 int pri_done; 1918 int pri_cmp; 1919 int pri_invert; 1920 1921 /* find the end of this facility name list */ 1922 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1923 continue; 1924 1925 /* get the priority comparison */ 1926 pri_cmp = 0; 1927 pri_done = 0; 1928 pri_invert = 0; 1929 if (*q == '!') { 1930 pri_invert = 1; 1931 q++; 1932 } 1933 while (!pri_done) { 1934 switch (*q) { 1935 case '<': 1936 pri_cmp |= PRI_LT; 1937 q++; 1938 break; 1939 case '=': 1940 pri_cmp |= PRI_EQ; 1941 q++; 1942 break; 1943 case '>': 1944 pri_cmp |= PRI_GT; 1945 q++; 1946 break; 1947 default: 1948 pri_done++; 1949 break; 1950 } 1951 } 1952 1953 /* collect priority name */ 1954 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1955 *bp++ = *q++; 1956 *bp = '\0'; 1957 1958 /* skip cruft */ 1959 while (strchr(",;", *q)) 1960 q++; 1961 1962 /* decode priority name */ 1963 if (*buf == '*') { 1964 pri = LOG_PRIMASK; 1965 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1966 } else { 1967 /* Ignore trailing spaces. */ 1968 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1969 buf[i] = '\0'; 1970 1971 pri = decode(buf, prioritynames); 1972 if (pri < 0) { 1973 errno = 0; 1974 (void)snprintf(ebuf, sizeof ebuf, 1975 "unknown priority name \"%s\"", buf); 1976 logerror(ebuf); 1977 return; 1978 } 1979 } 1980 if (!pri_cmp) 1981 pri_cmp = (UniquePriority) 1982 ? (PRI_EQ) 1983 : (PRI_EQ | PRI_GT) 1984 ; 1985 if (pri_invert) 1986 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1987 1988 /* scan facilities */ 1989 while (*p && !strchr("\t.; ", *p)) { 1990 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1991 *bp++ = *p++; 1992 *bp = '\0'; 1993 1994 if (*buf == '*') { 1995 for (i = 0; i < LOG_NFACILITIES; i++) { 1996 f->f_pmask[i] = pri; 1997 f->f_pcmp[i] = pri_cmp; 1998 } 1999 } else { 2000 i = decode(buf, facilitynames); 2001 if (i < 0) { 2002 errno = 0; 2003 (void)snprintf(ebuf, sizeof ebuf, 2004 "unknown facility name \"%s\"", 2005 buf); 2006 logerror(ebuf); 2007 return; 2008 } 2009 f->f_pmask[i >> 3] = pri; 2010 f->f_pcmp[i >> 3] = pri_cmp; 2011 } 2012 while (*p == ',' || *p == ' ') 2013 p++; 2014 } 2015 2016 p = q; 2017 } 2018 2019 /* skip to action part */ 2020 while (*p == '\t' || *p == ' ') 2021 p++; 2022 2023 if (*p == '-') { 2024 syncfile = 0; 2025 p++; 2026 } else 2027 syncfile = 1; 2028 2029 switch (*p) { 2030 case '@': 2031 { 2032 char *tp; 2033 char endkey = ':'; 2034 /* 2035 * scan forward to see if there is a port defined. 2036 * so we can't use strlcpy.. 2037 */ 2038 i = sizeof(f->f_un.f_forw.f_hname); 2039 tp = f->f_un.f_forw.f_hname; 2040 p++; 2041 2042 /* 2043 * an ipv6 address should start with a '[' in that case 2044 * we should scan for a ']' 2045 */ 2046 if (*p == '[') { 2047 p++; 2048 endkey = ']'; 2049 } 2050 while (*p && (*p != endkey) && (i-- > 0)) { 2051 *tp++ = *p++; 2052 } 2053 if (endkey == ']' && *p == endkey) 2054 p++; 2055 *tp = '\0'; 2056 } 2057 /* See if we copied a domain and have a port */ 2058 if (*p == ':') 2059 p++; 2060 else 2061 p = NULL; 2062 2063 memset(&hints, 0, sizeof(hints)); 2064 hints.ai_family = family; 2065 hints.ai_socktype = SOCK_DGRAM; 2066 error = getaddrinfo(f->f_un.f_forw.f_hname, 2067 p ? p : "syslog", &hints, &res); 2068 if (error) { 2069 logerror(gai_strerror(error)); 2070 break; 2071 } 2072 f->f_un.f_forw.f_addr = res; 2073 f->f_type = F_FORW; 2074 break; 2075 2076 case '/': 2077 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2078 f->f_type = F_UNUSED; 2079 logerror(p); 2080 break; 2081 } 2082 if (syncfile) 2083 f->f_flags |= FFLAG_SYNC; 2084 if (isatty(f->f_file)) { 2085 if (strcmp(p, ctty) == 0) 2086 f->f_type = F_CONSOLE; 2087 else 2088 f->f_type = F_TTY; 2089 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 2090 sizeof(f->f_un.f_fname)); 2091 } else { 2092 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2093 f->f_type = F_FILE; 2094 } 2095 break; 2096 2097 case '|': 2098 f->f_un.f_pipe.f_pid = 0; 2099 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2100 sizeof(f->f_un.f_pipe.f_pname)); 2101 f->f_type = F_PIPE; 2102 break; 2103 2104 case '*': 2105 f->f_type = F_WALL; 2106 break; 2107 2108 default: 2109 for (i = 0; i < MAXUNAMES && *p; i++) { 2110 for (q = p; *q && *q != ','; ) 2111 q++; 2112 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2113 if ((q - p) >= MAXLOGNAME) 2114 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2115 else 2116 f->f_un.f_uname[i][q - p] = '\0'; 2117 while (*q == ',' || *q == ' ') 2118 q++; 2119 p = q; 2120 } 2121 f->f_type = F_USERS; 2122 break; 2123 } 2124} 2125 2126 2127/* 2128 * Decode a symbolic name to a numeric value 2129 */ 2130static int 2131decode(const char *name, const CODE *codetab) 2132{ 2133 const CODE *c; 2134 char *p, buf[40]; 2135 2136 if (isdigit(*name)) 2137 return (atoi(name)); 2138 2139 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2140 if (isupper(*name)) 2141 *p = tolower(*name); 2142 else 2143 *p = *name; 2144 } 2145 *p = '\0'; 2146 for (c = codetab; c->c_name; c++) 2147 if (!strcmp(buf, c->c_name)) 2148 return (c->c_val); 2149 2150 return (-1); 2151} 2152 2153static void 2154markit(void) 2155{ 2156 struct filed *f; 2157 dq_t q, next; 2158 2159 now = time((time_t *)NULL); 2160 MarkSeq += TIMERINTVL; 2161 if (MarkSeq >= MarkInterval) { 2162 logmsg(LOG_INFO, "-- MARK --", 2163 LocalHostName, ADDDATE|MARK); 2164 MarkSeq = 0; 2165 } 2166 2167 for (f = Files; f; f = f->f_next) { 2168 if (f->f_prevcount && now >= REPEATTIME(f)) { 2169 dprintf("flush %s: repeated %d times, %d sec.\n", 2170 TypeNames[f->f_type], f->f_prevcount, 2171 repeatinterval[f->f_repeatcount]); 2172 fprintlog(f, 0, (char *)NULL); 2173 BACKOFF(f); 2174 } 2175 } 2176 2177 /* Walk the dead queue, and see if we should signal somebody. */ 2178 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2179 next = TAILQ_NEXT(q, dq_entries); 2180 2181 switch (q->dq_timeout) { 2182 case 0: 2183 /* Already signalled once, try harder now. */ 2184 if (kill(q->dq_pid, SIGKILL) != 0) 2185 (void)deadq_remove(q->dq_pid); 2186 break; 2187 2188 case 1: 2189 /* 2190 * Timed out on dead queue, send terminate 2191 * signal. Note that we leave the removal 2192 * from the dead queue to reapchild(), which 2193 * will also log the event (unless the process 2194 * didn't even really exist, in case we simply 2195 * drop it from the dead queue). 2196 */ 2197 if (kill(q->dq_pid, SIGTERM) != 0) 2198 (void)deadq_remove(q->dq_pid); 2199 /* FALLTHROUGH */ 2200 2201 default: 2202 q->dq_timeout--; 2203 } 2204 } 2205 MarkSet = 0; 2206 (void)alarm(TIMERINTVL); 2207} 2208 2209/* 2210 * fork off and become a daemon, but wait for the child to come online 2211 * before returning to the parent, or we get disk thrashing at boot etc. 2212 * Set a timer so we don't hang forever if it wedges. 2213 */ 2214static int 2215waitdaemon(int nochdir, int noclose, int maxwait) 2216{ 2217 int fd; 2218 int status; 2219 pid_t pid, childpid; 2220 2221 switch (childpid = fork()) { 2222 case -1: 2223 return (-1); 2224 case 0: 2225 break; 2226 default: 2227 signal(SIGALRM, timedout); 2228 alarm(maxwait); 2229 while ((pid = wait3(&status, 0, NULL)) != -1) { 2230 if (WIFEXITED(status)) 2231 errx(1, "child pid %d exited with return code %d", 2232 pid, WEXITSTATUS(status)); 2233 if (WIFSIGNALED(status)) 2234 errx(1, "child pid %d exited on signal %d%s", 2235 pid, WTERMSIG(status), 2236 WCOREDUMP(status) ? " (core dumped)" : 2237 ""); 2238 if (pid == childpid) /* it's gone... */ 2239 break; 2240 } 2241 exit(0); 2242 } 2243 2244 if (setsid() == -1) 2245 return (-1); 2246 2247 if (!nochdir) 2248 (void)chdir("/"); 2249 2250 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2251 (void)dup2(fd, STDIN_FILENO); 2252 (void)dup2(fd, STDOUT_FILENO); 2253 (void)dup2(fd, STDERR_FILENO); 2254 if (fd > 2) 2255 (void)close (fd); 2256 } 2257 return (getppid()); 2258} 2259 2260/* 2261 * We get a SIGALRM from the child when it's running and finished doing it's 2262 * fsync()'s or O_SYNC writes for all the boot messages. 2263 * 2264 * We also get a signal from the kernel if the timer expires, so check to 2265 * see what happened. 2266 */ 2267static void 2268timedout(int sig __unused) 2269{ 2270 int left; 2271 left = alarm(0); 2272 signal(SIGALRM, SIG_DFL); 2273 if (left == 0) 2274 errx(1, "timed out waiting for child"); 2275 else 2276 _exit(0); 2277} 2278 2279/* 2280 * Add `s' to the list of allowable peer addresses to accept messages 2281 * from. 2282 * 2283 * `s' is a string in the form: 2284 * 2285 * [*]domainname[:{servicename|portnumber|*}] 2286 * 2287 * or 2288 * 2289 * netaddr/maskbits[:{servicename|portnumber|*}] 2290 * 2291 * Returns -1 on error, 0 if the argument was valid. 2292 */ 2293static int 2294allowaddr(char *s) 2295{ 2296 char *cp1, *cp2; 2297 struct allowedpeer ap; 2298 struct servent *se; 2299 int masklen = -1; 2300 struct addrinfo hints, *res; 2301 struct in_addr *addrp, *maskp; 2302#ifdef INET6 2303 int i; 2304 u_int32_t *addr6p, *mask6p; 2305#endif 2306 char ip[NI_MAXHOST]; 2307 2308#ifdef INET6 2309 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2310#endif 2311 cp1 = s; 2312 if ((cp1 = strrchr(cp1, ':'))) { 2313 /* service/port provided */ 2314 *cp1++ = '\0'; 2315 if (strlen(cp1) == 1 && *cp1 == '*') 2316 /* any port allowed */ 2317 ap.port = 0; 2318 else if ((se = getservbyname(cp1, "udp"))) { 2319 ap.port = ntohs(se->s_port); 2320 } else { 2321 ap.port = strtol(cp1, &cp2, 0); 2322 if (*cp2 != '\0') 2323 return (-1); /* port not numeric */ 2324 } 2325 } else { 2326 if ((se = getservbyname("syslog", "udp"))) 2327 ap.port = ntohs(se->s_port); 2328 else 2329 /* sanity, should not happen */ 2330 ap.port = 514; 2331 } 2332 2333 if ((cp1 = strchr(s, '/')) != NULL && 2334 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2335 *cp1 = '\0'; 2336 if ((masklen = atoi(cp1 + 1)) < 0) 2337 return (-1); 2338 } 2339#ifdef INET6 2340 if (*s == '[') { 2341 cp2 = s + strlen(s) - 1; 2342 if (*cp2 == ']') { 2343 ++s; 2344 *cp2 = '\0'; 2345 } else { 2346 cp2 = NULL; 2347 } 2348 } else { 2349 cp2 = NULL; 2350 } 2351#endif 2352 memset(&hints, 0, sizeof(hints)); 2353 hints.ai_family = PF_UNSPEC; 2354 hints.ai_socktype = SOCK_DGRAM; 2355 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2356 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2357 ap.isnumeric = 1; 2358 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2359 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2360 ap.a_mask.ss_family = res->ai_family; 2361 if (res->ai_family == AF_INET) { 2362 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2363 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2364 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2365 if (masklen < 0) { 2366 /* use default netmask */ 2367 if (IN_CLASSA(ntohl(addrp->s_addr))) 2368 maskp->s_addr = htonl(IN_CLASSA_NET); 2369 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2370 maskp->s_addr = htonl(IN_CLASSB_NET); 2371 else 2372 maskp->s_addr = htonl(IN_CLASSC_NET); 2373 } else if (masklen <= 32) { 2374 /* convert masklen to netmask */ 2375 if (masklen == 0) 2376 maskp->s_addr = 0; 2377 else 2378 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2379 } else { 2380 freeaddrinfo(res); 2381 return (-1); 2382 } 2383 /* Lose any host bits in the network number. */ 2384 addrp->s_addr &= maskp->s_addr; 2385 } 2386#ifdef INET6 2387 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2388 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2389 if (masklen < 0) 2390 masklen = 128; 2391 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2392 /* convert masklen to netmask */ 2393 while (masklen > 0) { 2394 if (masklen < 32) { 2395 *mask6p = htonl(~(0xffffffff >> masklen)); 2396 break; 2397 } 2398 *mask6p++ = 0xffffffff; 2399 masklen -= 32; 2400 } 2401 /* Lose any host bits in the network number. */ 2402 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2403 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2404 for (i = 0; i < 4; i++) 2405 addr6p[i] &= mask6p[i]; 2406 } 2407#endif 2408 else { 2409 freeaddrinfo(res); 2410 return (-1); 2411 } 2412 freeaddrinfo(res); 2413 } else { 2414 /* arg `s' is domain name */ 2415 ap.isnumeric = 0; 2416 ap.a_name = s; 2417 if (cp1) 2418 *cp1 = '/'; 2419#ifdef INET6 2420 if (cp2) { 2421 *cp2 = ']'; 2422 --s; 2423 } 2424#endif 2425 } 2426 2427 if (Debug) { 2428 printf("allowaddr: rule %d: ", NumAllowed); 2429 if (ap.isnumeric) { 2430 printf("numeric, "); 2431 getnameinfo((struct sockaddr *)&ap.a_addr, 2432 ((struct sockaddr *)&ap.a_addr)->sa_len, 2433 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2434 printf("addr = %s, ", ip); 2435 getnameinfo((struct sockaddr *)&ap.a_mask, 2436 ((struct sockaddr *)&ap.a_mask)->sa_len, 2437 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2438 printf("mask = %s; ", ip); 2439 } else { 2440 printf("domainname = %s; ", ap.a_name); 2441 } 2442 printf("port = %d\n", ap.port); 2443 } 2444 2445 if ((AllowedPeers = realloc(AllowedPeers, 2446 ++NumAllowed * sizeof(struct allowedpeer))) 2447 == NULL) { 2448 logerror("realloc"); 2449 exit(1); 2450 } 2451 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2452 return (0); 2453} 2454 2455/* 2456 * Validate that the remote peer has permission to log to us. 2457 */ 2458static int 2459validate(struct sockaddr *sa, const char *hname) 2460{ 2461 int i; 2462 size_t l1, l2; 2463 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2464 struct allowedpeer *ap; 2465 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2466#ifdef INET6 2467 int j, reject; 2468 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2469#endif 2470 struct addrinfo hints, *res; 2471 u_short sport; 2472 2473 if (NumAllowed == 0) 2474 /* traditional behaviour, allow everything */ 2475 return (1); 2476 2477 (void)strlcpy(name, hname, sizeof(name)); 2478 memset(&hints, 0, sizeof(hints)); 2479 hints.ai_family = PF_UNSPEC; 2480 hints.ai_socktype = SOCK_DGRAM; 2481 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2482 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2483 freeaddrinfo(res); 2484 else if (strchr(name, '.') == NULL) { 2485 strlcat(name, ".", sizeof name); 2486 strlcat(name, LocalDomain, sizeof name); 2487 } 2488 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2489 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2490 return (0); /* for safety, should not occur */ 2491 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2492 ip, port, name); 2493 sport = atoi(port); 2494 2495 /* now, walk down the list */ 2496 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2497 if (ap->port != 0 && ap->port != sport) { 2498 dprintf("rejected in rule %d due to port mismatch.\n", i); 2499 continue; 2500 } 2501 2502 if (ap->isnumeric) { 2503 if (ap->a_addr.ss_family != sa->sa_family) { 2504 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2505 continue; 2506 } 2507 if (ap->a_addr.ss_family == AF_INET) { 2508 sin4 = (struct sockaddr_in *)sa; 2509 a4p = (struct sockaddr_in *)&ap->a_addr; 2510 m4p = (struct sockaddr_in *)&ap->a_mask; 2511 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2512 != a4p->sin_addr.s_addr) { 2513 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2514 continue; 2515 } 2516 } 2517#ifdef INET6 2518 else if (ap->a_addr.ss_family == AF_INET6) { 2519 sin6 = (struct sockaddr_in6 *)sa; 2520 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2521 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2522 if (a6p->sin6_scope_id != 0 && 2523 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2524 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2525 continue; 2526 } 2527 reject = 0; 2528 for (j = 0; j < 16; j += 4) { 2529 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2530 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2531 ++reject; 2532 break; 2533 } 2534 } 2535 if (reject) { 2536 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2537 continue; 2538 } 2539 } 2540#endif 2541 else 2542 continue; 2543 } else { 2544 cp = ap->a_name; 2545 l1 = strlen(name); 2546 if (*cp == '*') { 2547 /* allow wildmatch */ 2548 cp++; 2549 l2 = strlen(cp); 2550 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2551 dprintf("rejected in rule %d due to name mismatch.\n", i); 2552 continue; 2553 } 2554 } else { 2555 /* exact match */ 2556 l2 = strlen(cp); 2557 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2558 dprintf("rejected in rule %d due to name mismatch.\n", i); 2559 continue; 2560 } 2561 } 2562 } 2563 dprintf("accepted in rule %d.\n", i); 2564 return (1); /* hooray! */ 2565 } 2566 return (0); 2567} 2568 2569/* 2570 * Fairly similar to popen(3), but returns an open descriptor, as 2571 * opposed to a FILE *. 2572 */ 2573static int 2574p_open(const char *prog, pid_t *rpid) 2575{ 2576 int pfd[2], nulldesc; 2577 pid_t pid; 2578 sigset_t omask, mask; 2579 char *argv[4]; /* sh -c cmd NULL */ 2580 char errmsg[200]; 2581 2582 if (pipe(pfd) == -1) 2583 return (-1); 2584 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2585 /* we are royally screwed anyway */ 2586 return (-1); 2587 2588 sigemptyset(&mask); 2589 sigaddset(&mask, SIGALRM); 2590 sigaddset(&mask, SIGHUP); 2591 sigprocmask(SIG_BLOCK, &mask, &omask); 2592 switch ((pid = fork())) { 2593 case -1: 2594 sigprocmask(SIG_SETMASK, &omask, 0); 2595 close(nulldesc); 2596 return (-1); 2597 2598 case 0: 2599 argv[0] = strdup("sh"); 2600 argv[1] = strdup("-c"); 2601 argv[2] = strdup(prog); 2602 argv[3] = NULL; 2603 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2604 logerror("strdup"); 2605 exit(1); 2606 } 2607 2608 alarm(0); 2609 (void)setsid(); /* Avoid catching SIGHUPs. */ 2610 2611 /* 2612 * Throw away pending signals, and reset signal 2613 * behaviour to standard values. 2614 */ 2615 signal(SIGALRM, SIG_IGN); 2616 signal(SIGHUP, SIG_IGN); 2617 sigprocmask(SIG_SETMASK, &omask, 0); 2618 signal(SIGPIPE, SIG_DFL); 2619 signal(SIGQUIT, SIG_DFL); 2620 signal(SIGALRM, SIG_DFL); 2621 signal(SIGHUP, SIG_DFL); 2622 2623 dup2(pfd[0], STDIN_FILENO); 2624 dup2(nulldesc, STDOUT_FILENO); 2625 dup2(nulldesc, STDERR_FILENO); 2626 closefrom(3); 2627 2628 (void)execvp(_PATH_BSHELL, argv); 2629 _exit(255); 2630 } 2631 2632 sigprocmask(SIG_SETMASK, &omask, 0); 2633 close(nulldesc); 2634 close(pfd[0]); 2635 /* 2636 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2637 * supposed to get an EWOULDBLOCK on writev(2), which is 2638 * caught by the logic above anyway, which will in turn close 2639 * the pipe, and fork a new logging subprocess if necessary. 2640 * The stale subprocess will be killed some time later unless 2641 * it terminated itself due to closing its input pipe (so we 2642 * get rid of really dead puppies). 2643 */ 2644 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2645 /* This is bad. */ 2646 (void)snprintf(errmsg, sizeof errmsg, 2647 "Warning: cannot change pipe to PID %d to " 2648 "non-blocking behaviour.", 2649 (int)pid); 2650 logerror(errmsg); 2651 } 2652 *rpid = pid; 2653 return (pfd[1]); 2654} 2655 2656static void 2657deadq_enter(pid_t pid, const char *name) 2658{ 2659 dq_t p; 2660 int status; 2661 2662 if (pid == 0) 2663 return; 2664 /* 2665 * Be paranoid, if we can't signal the process, don't enter it 2666 * into the dead queue (perhaps it's already dead). If possible, 2667 * we try to fetch and log the child's status. 2668 */ 2669 if (kill(pid, 0) != 0) { 2670 if (waitpid(pid, &status, WNOHANG) > 0) 2671 log_deadchild(pid, status, name); 2672 return; 2673 } 2674 2675 p = malloc(sizeof(struct deadq_entry)); 2676 if (p == NULL) { 2677 logerror("malloc"); 2678 exit(1); 2679 } 2680 2681 p->dq_pid = pid; 2682 p->dq_timeout = DQ_TIMO_INIT; 2683 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2684} 2685 2686static int 2687deadq_remove(pid_t pid) 2688{ 2689 dq_t q; 2690 2691 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2692 if (q->dq_pid == pid) { 2693 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2694 free(q); 2695 return (1); 2696 } 2697 } 2698 2699 return (0); 2700} 2701 2702static void 2703log_deadchild(pid_t pid, int status, const char *name) 2704{ 2705 int code; 2706 char buf[256]; 2707 const char *reason; 2708 2709 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2710 if (WIFSIGNALED(status)) { 2711 reason = "due to signal"; 2712 code = WTERMSIG(status); 2713 } else { 2714 reason = "with status"; 2715 code = WEXITSTATUS(status); 2716 if (code == 0) 2717 return; 2718 } 2719 (void)snprintf(buf, sizeof buf, 2720 "Logging subprocess %d (%s) exited %s %d.", 2721 pid, name, reason, code); 2722 logerror(buf); 2723} 2724 2725static int * 2726socksetup(int af, char *bindhostname) 2727{ 2728 struct addrinfo hints, *res, *r; 2729 const char *bindservice; 2730 char *cp; 2731 int error, maxs, *s, *socks; 2732 2733 /* 2734 * We have to handle this case for backwards compatibility: 2735 * If there are two (or more) colons but no '[' and ']', 2736 * assume this is an inet6 address without a service. 2737 */ 2738 bindservice = "syslog"; 2739 if (bindhostname != NULL) { 2740#ifdef INET6 2741 if (*bindhostname == '[' && 2742 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2743 ++bindhostname; 2744 *cp = '\0'; 2745 if (cp[1] == ':' && cp[2] != '\0') 2746 bindservice = cp + 2; 2747 } else { 2748#endif 2749 cp = strchr(bindhostname, ':'); 2750 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2751 *cp = '\0'; 2752 if (cp[1] != '\0') 2753 bindservice = cp + 1; 2754 if (cp == bindhostname) 2755 bindhostname = NULL; 2756 } 2757#ifdef INET6 2758 } 2759#endif 2760 } 2761 2762 memset(&hints, 0, sizeof(hints)); 2763 hints.ai_flags = AI_PASSIVE; 2764 hints.ai_family = af; 2765 hints.ai_socktype = SOCK_DGRAM; 2766 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2767 if (error) { 2768 logerror(gai_strerror(error)); 2769 errno = 0; 2770 die(0); 2771 } 2772 2773 /* Count max number of sockets we may open */ 2774 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2775 socks = malloc((maxs+1) * sizeof(int)); 2776 if (socks == NULL) { 2777 logerror("couldn't allocate memory for sockets"); 2778 die(0); 2779 } 2780 2781 *socks = 0; /* num of sockets counter at start of array */ 2782 s = socks + 1; 2783 for (r = res; r; r = r->ai_next) { 2784 int on = 1; 2785 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2786 if (*s < 0) { 2787 logerror("socket"); 2788 continue; 2789 } 2790#ifdef INET6 2791 if (r->ai_family == AF_INET6) { 2792 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2793 (char *)&on, sizeof (on)) < 0) { 2794 logerror("setsockopt"); 2795 close(*s); 2796 continue; 2797 } 2798 } 2799#endif 2800 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2801 (char *)&on, sizeof (on)) < 0) { 2802 logerror("setsockopt"); 2803 close(*s); 2804 continue; 2805 } 2806 /* 2807 * RFC 3164 recommends that client side message 2808 * should come from the privileged syslogd port. 2809 * 2810 * If the system administrator choose not to obey 2811 * this, we can skip the bind() step so that the 2812 * system will choose a port for us. 2813 */ 2814 if (!NoBind) { 2815 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2816 logerror("bind"); 2817 close(*s); 2818 continue; 2819 } 2820 2821 if (!SecureMode) 2822 increase_rcvbuf(*s); 2823 } 2824 2825 (*socks)++; 2826 s++; 2827 } 2828 2829 if (*socks == 0) { 2830 free(socks); 2831 if (Debug) 2832 return (NULL); 2833 else 2834 die(0); 2835 } 2836 if (res) 2837 freeaddrinfo(res); 2838 2839 return (socks); 2840} 2841 2842static void 2843increase_rcvbuf(int fd) 2844{ 2845 socklen_t len, slen; 2846 2847 slen = sizeof(len); 2848 2849 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2850 if (len < RCVBUF_MINSIZE) { 2851 len = RCVBUF_MINSIZE; 2852 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2853 } 2854 } 2855} 2856