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 MAXLINE /* 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) __dead2; 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 const char *ttymsg_check(struct iovec *, int, char *, int); 345 static void usage(void); 346 static int validate(struct sockaddr *, const char *); 347 static void unmapped(struct sockaddr *); 348 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 349 static int waitdaemon(int, int, int); 350 static void timedout(int); 351 static void increase_rcvbuf(int); 352 353 static void 354 close_filed(struct filed *f) 355 { 356 357 if (f == NULL || f->f_file == -1) 358 return; 359 360 (void)close(f->f_file); 361 f->f_file = -1; 362 f->f_type = F_UNUSED; 363 } 364 365 int 366 main(int argc, char *argv[]) 367 { 368 int ch, i, fdsrmax = 0, l; 369 struct sockaddr_un sunx, fromunix; 370 struct sockaddr_storage frominet; 371 fd_set *fdsr = NULL; 372 char line[MAXLINE + 1]; 373 const char *hname; 374 struct timeval tv, *tvp; 375 struct sigaction sact; 376 struct host *host; 377 struct funix *fx, *fx1; 378 sigset_t mask; 379 pid_t ppid = 1, spid; 380 socklen_t len; 381 382 if (madvise(NULL, 0, MADV_PROTECT) != 0) 383 dprintf("madvise() failed: %s\n", strerror(errno)); 384 385 STAILQ_INIT(&hqueue); 386 387 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 388 != -1) 389 switch (ch) { 390 case '4': 391 family = PF_INET; 392 break; 393 #ifdef INET6 394 case '6': 395 family = PF_INET6; 396 break; 397 #endif 398 case '8': 399 mask_C1 = 0; 400 break; 401 case 'A': 402 send_to_all++; 403 break; 404 case 'a': /* allow specific network addresses only */ 405 if (allowaddr(optarg) == -1) 406 usage(); 407 break; 408 case 'b': 409 { 410 if ((host = malloc(sizeof(struct host))) == NULL) 411 err(1, "malloc failed"); 412 host->name = optarg; 413 STAILQ_INSERT_TAIL(&hqueue, host, next); 414 break; 415 } 416 case 'c': 417 no_compress++; 418 break; 419 case 'C': 420 logflags |= O_CREAT; 421 break; 422 case 'd': /* debug */ 423 Debug++; 424 break; 425 case 'f': /* configuration file */ 426 ConfFile = optarg; 427 break; 428 case 'F': /* run in foreground instead of daemon */ 429 Foreground++; 430 break; 431 case 'k': /* keep remote kern fac */ 432 KeepKernFac = 1; 433 break; 434 case 'l': 435 { 436 long perml; 437 mode_t mode; 438 char *name, *ep; 439 440 if (optarg[0] == '/') { 441 mode = DEFFILEMODE; 442 name = optarg; 443 } else if ((name = strchr(optarg, ':')) != NULL) { 444 *name++ = '\0'; 445 if (name[0] != '/') 446 errx(1, "socket name must be absolute " 447 "path"); 448 if (isdigit(*optarg)) { 449 perml = strtol(optarg, &ep, 8); 450 if (*ep || perml < 0 || 451 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 452 errx(1, "invalid mode %s, exiting", 453 optarg); 454 mode = (mode_t )perml; 455 } else 456 errx(1, "invalid mode %s, exiting", 457 optarg); 458 } else /* doesn't begin with '/', and no ':' */ 459 errx(1, "can't parse path %s", optarg); 460 461 if (strlen(name) >= sizeof(sunx.sun_path)) 462 errx(1, "%s path too long, exiting", name); 463 if ((fx = malloc(sizeof(struct funix))) == NULL) 464 err(1, "malloc failed"); 465 fx->s = -1; 466 fx->name = name; 467 fx->mode = mode; 468 STAILQ_INSERT_TAIL(&funixes, fx, next); 469 break; 470 } 471 case 'm': /* mark interval */ 472 MarkInterval = atoi(optarg) * 60; 473 break; 474 case 'N': 475 NoBind = 1; 476 SecureMode = 1; 477 break; 478 case 'n': 479 resolve = 0; 480 break; 481 case 'o': 482 use_bootfile = 1; 483 break; 484 case 'p': /* path */ 485 if (strlen(optarg) >= sizeof(sunx.sun_path)) 486 errx(1, "%s path too long, exiting", optarg); 487 funix_default.name = optarg; 488 break; 489 case 'P': /* path for alt. PID */ 490 PidFile = optarg; 491 break; 492 case 's': /* no network mode */ 493 SecureMode++; 494 break; 495 case 'S': /* path for privileged originator */ 496 if (strlen(optarg) >= sizeof(sunx.sun_path)) 497 errx(1, "%s path too long, exiting", optarg); 498 funix_secure.name = optarg; 499 break; 500 case 'T': 501 RemoteAddDate = 1; 502 break; 503 case 'u': /* only log specified priority */ 504 UniquePriority++; 505 break; 506 case 'v': /* log facility and priority */ 507 LogFacPri++; 508 break; 509 default: 510 usage(); 511 } 512 if ((argc -= optind) != 0) 513 usage(); 514 515 pfh = pidfile_open(PidFile, 0600, &spid); 516 if (pfh == NULL) { 517 if (errno == EEXIST) 518 errx(1, "syslogd already running, pid: %d", spid); 519 warn("cannot open pid file"); 520 } 521 522 if ((!Foreground) && (!Debug)) { 523 ppid = waitdaemon(0, 0, 30); 524 if (ppid < 0) { 525 warn("could not become daemon"); 526 pidfile_remove(pfh); 527 exit(1); 528 } 529 } else if (Debug) { 530 setlinebuf(stdout); 531 } 532 533 if (NumAllowed) 534 endservent(); 535 536 consfile.f_type = F_CONSOLE; 537 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 538 sizeof(consfile.f_un.f_fname)); 539 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 540 (void)signal(SIGTERM, dodie); 541 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 542 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 543 /* 544 * We don't want the SIGCHLD and SIGHUP handlers to interfere 545 * with each other; they are likely candidates for being called 546 * simultaneously (SIGHUP closes pipe descriptor, process dies, 547 * SIGCHLD happens). 548 */ 549 sigemptyset(&mask); 550 sigaddset(&mask, SIGHUP); 551 sact.sa_handler = reapchild; 552 sact.sa_mask = mask; 553 sact.sa_flags = SA_RESTART; 554 (void)sigaction(SIGCHLD, &sact, NULL); 555 (void)signal(SIGALRM, domark); 556 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 557 (void)alarm(TIMERINTVL); 558 559 TAILQ_INIT(&deadq_head); 560 561 #ifndef SUN_LEN 562 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 563 #endif 564 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 565 (void)unlink(fx->name); 566 memset(&sunx, 0, sizeof(sunx)); 567 sunx.sun_family = AF_LOCAL; 568 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 569 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 570 if (fx->s < 0 || 571 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 572 chmod(fx->name, fx->mode) < 0) { 573 (void)snprintf(line, sizeof line, 574 "cannot create %s", fx->name); 575 logerror(line); 576 dprintf("cannot create %s (%d)\n", fx->name, errno); 577 if (fx == &funix_default || fx == &funix_secure) 578 die(0); 579 else { 580 STAILQ_REMOVE(&funixes, fx, funix, next); 581 continue; 582 } 583 } 584 increase_rcvbuf(fx->s); 585 } 586 if (SecureMode <= 1) { 587 if (STAILQ_EMPTY(&hqueue)) 588 finet = socksetup(family, NULL); 589 STAILQ_FOREACH(host, &hqueue, next) { 590 int *finet0, total; 591 finet0 = socksetup(family, host->name); 592 if (finet0 && !finet) { 593 finet = finet0; 594 } else if (finet0 && finet) { 595 total = *finet0 + *finet + 1; 596 finet = realloc(finet, total * sizeof(int)); 597 if (finet == NULL) 598 err(1, "realloc failed"); 599 for (i = 1; i <= *finet0; i++) { 600 finet[(*finet)+i] = finet0[i]; 601 } 602 *finet = total - 1; 603 free(finet0); 604 } 605 } 606 } 607 608 if (finet) { 609 if (SecureMode) { 610 for (i = 0; i < *finet; i++) { 611 if (shutdown(finet[i+1], SHUT_RD) < 0 && 612 errno != ENOTCONN) { 613 logerror("shutdown"); 614 if (!Debug) 615 die(0); 616 } 617 } 618 } else { 619 dprintf("listening on inet and/or inet6 socket\n"); 620 } 621 dprintf("sending on inet and/or inet6 socket\n"); 622 } 623 624 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 625 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 626 fklog = -1; 627 if (fklog < 0) 628 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 629 630 /* tuck my process id away */ 631 pidfile_write(pfh); 632 633 dprintf("off & running....\n"); 634 635 init(0); 636 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 637 sigemptyset(&mask); 638 sigaddset(&mask, SIGCHLD); 639 sact.sa_handler = init; 640 sact.sa_mask = mask; 641 sact.sa_flags = SA_RESTART; 642 (void)sigaction(SIGHUP, &sact, NULL); 643 644 tvp = &tv; 645 tv.tv_sec = tv.tv_usec = 0; 646 647 if (fklog != -1 && fklog > fdsrmax) 648 fdsrmax = fklog; 649 if (finet && !SecureMode) { 650 for (i = 0; i < *finet; i++) { 651 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 652 fdsrmax = finet[i+1]; 653 } 654 } 655 STAILQ_FOREACH(fx, &funixes, next) 656 if (fx->s > fdsrmax) 657 fdsrmax = fx->s; 658 659 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 660 sizeof(fd_mask)); 661 if (fdsr == NULL) 662 errx(1, "calloc fd_set"); 663 664 for (;;) { 665 if (MarkSet) 666 markit(); 667 if (WantDie) 668 die(WantDie); 669 670 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 671 sizeof(fd_mask)); 672 673 if (fklog != -1) 674 FD_SET(fklog, fdsr); 675 if (finet && !SecureMode) { 676 for (i = 0; i < *finet; i++) { 677 if (finet[i+1] != -1) 678 FD_SET(finet[i+1], fdsr); 679 } 680 } 681 STAILQ_FOREACH(fx, &funixes, next) 682 FD_SET(fx->s, fdsr); 683 684 i = select(fdsrmax+1, fdsr, NULL, NULL, 685 needdofsync ? &tv : tvp); 686 switch (i) { 687 case 0: 688 dofsync(); 689 needdofsync = 0; 690 if (tvp) { 691 tvp = NULL; 692 if (ppid != 1) 693 kill(ppid, SIGALRM); 694 } 695 continue; 696 case -1: 697 if (errno != EINTR) 698 logerror("select"); 699 continue; 700 } 701 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 702 readklog(); 703 if (finet && !SecureMode) { 704 for (i = 0; i < *finet; i++) { 705 if (FD_ISSET(finet[i+1], fdsr)) { 706 len = sizeof(frominet); 707 l = recvfrom(finet[i+1], line, MAXLINE, 708 0, (struct sockaddr *)&frominet, 709 &len); 710 if (l > 0) { 711 line[l] = '\0'; 712 hname = cvthname((struct sockaddr *)&frominet); 713 unmapped((struct sockaddr *)&frominet); 714 if (validate((struct sockaddr *)&frominet, hname)) 715 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 716 } else if (l < 0 && errno != EINTR) 717 logerror("recvfrom inet"); 718 } 719 } 720 } 721 STAILQ_FOREACH(fx, &funixes, next) { 722 if (FD_ISSET(fx->s, fdsr)) { 723 len = sizeof(fromunix); 724 l = recvfrom(fx->s, line, MAXLINE, 0, 725 (struct sockaddr *)&fromunix, &len); 726 if (l > 0) { 727 line[l] = '\0'; 728 printline(LocalHostName, line, 0); 729 } else if (l < 0 && errno != EINTR) 730 logerror("recvfrom unix"); 731 } 732 } 733 } 734 if (fdsr) 735 free(fdsr); 736 } 737 738 static void 739 unmapped(struct sockaddr *sa) 740 { 741 struct sockaddr_in6 *sin6; 742 struct sockaddr_in sin4; 743 744 if (sa->sa_family != AF_INET6) 745 return; 746 if (sa->sa_len != sizeof(struct sockaddr_in6) || 747 sizeof(sin4) > sa->sa_len) 748 return; 749 sin6 = (struct sockaddr_in6 *)sa; 750 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 751 return; 752 753 memset(&sin4, 0, sizeof(sin4)); 754 sin4.sin_family = AF_INET; 755 sin4.sin_len = sizeof(struct sockaddr_in); 756 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 757 sizeof(sin4.sin_addr)); 758 sin4.sin_port = sin6->sin6_port; 759 760 memcpy(sa, &sin4, sin4.sin_len); 761 } 762 763 static void 764 usage(void) 765 { 766 767 fprintf(stderr, "%s\n%s\n%s\n%s\n", 768 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 769 " [-b bind_address] [-f config_file]", 770 " [-l [mode:]path] [-m mark_interval]", 771 " [-P pid_file] [-p log_socket]"); 772 exit(1); 773 } 774 775 /* 776 * Take a raw input line, decode the message, and print the message 777 * on the appropriate log files. 778 */ 779 static void 780 printline(const char *hname, char *msg, int flags) 781 { 782 char *p, *q; 783 long n; 784 int c, pri; 785 char line[MAXLINE + 1]; 786 787 /* test for special codes */ 788 p = msg; 789 pri = DEFUPRI; 790 if (*p == '<') { 791 errno = 0; 792 n = strtol(p + 1, &q, 10); 793 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 794 p = q + 1; 795 pri = n; 796 } 797 } 798 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 799 pri = DEFUPRI; 800 801 /* 802 * Don't allow users to log kernel messages. 803 * NOTE: since LOG_KERN == 0 this will also match 804 * messages with no facility specified. 805 */ 806 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 807 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 808 809 q = line; 810 811 while ((c = (unsigned char)*p++) != '\0' && 812 q < &line[sizeof(line) - 4]) { 813 if (mask_C1 && (c & 0x80) && c < 0xA0) { 814 c &= 0x7F; 815 *q++ = 'M'; 816 *q++ = '-'; 817 } 818 if (isascii(c) && iscntrl(c)) { 819 if (c == '\n') { 820 *q++ = ' '; 821 } else if (c == '\t') { 822 *q++ = '\t'; 823 } else { 824 *q++ = '^'; 825 *q++ = c ^ 0100; 826 } 827 } else { 828 *q++ = c; 829 } 830 } 831 *q = '\0'; 832 833 logmsg(pri, line, hname, flags); 834 } 835 836 /* 837 * Read /dev/klog while data are available, split into lines. 838 */ 839 static void 840 readklog(void) 841 { 842 char *p, *q, line[MAXLINE + 1]; 843 int len, i; 844 845 len = 0; 846 for (;;) { 847 i = read(fklog, line + len, MAXLINE - 1 - len); 848 if (i > 0) { 849 line[i + len] = '\0'; 850 } else { 851 if (i < 0 && errno != EINTR && errno != EAGAIN) { 852 logerror("klog"); 853 fklog = -1; 854 } 855 break; 856 } 857 858 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 859 *q = '\0'; 860 printsys(p); 861 } 862 len = strlen(p); 863 if (len >= MAXLINE - 1) { 864 printsys(p); 865 len = 0; 866 } 867 if (len > 0) 868 memmove(line, p, len + 1); 869 } 870 if (len > 0) 871 printsys(line); 872 } 873 874 /* 875 * Take a raw input line from /dev/klog, format similar to syslog(). 876 */ 877 static void 878 printsys(char *msg) 879 { 880 char *p, *q; 881 long n; 882 int flags, isprintf, pri; 883 884 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 885 p = msg; 886 pri = DEFSPRI; 887 isprintf = 1; 888 if (*p == '<') { 889 errno = 0; 890 n = strtol(p + 1, &q, 10); 891 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 892 p = q + 1; 893 pri = n; 894 isprintf = 0; 895 } 896 } 897 /* 898 * Kernel printf's and LOG_CONSOLE messages have been displayed 899 * on the console already. 900 */ 901 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 902 flags |= IGN_CONS; 903 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 904 pri = DEFSPRI; 905 logmsg(pri, p, LocalHostName, flags); 906 } 907 908 static time_t now; 909 910 /* 911 * Match a program or host name against a specification. 912 * Return a non-0 value if the message must be ignored 913 * based on the specification. 914 */ 915 static int 916 skip_message(const char *name, const char *spec, int checkcase) 917 { 918 const char *s; 919 char prev, next; 920 int exclude = 0; 921 /* Behaviour on explicit match */ 922 923 if (spec == NULL) 924 return 0; 925 switch (*spec) { 926 case '-': 927 exclude = 1; 928 /*FALLTHROUGH*/ 929 case '+': 930 spec++; 931 break; 932 default: 933 break; 934 } 935 if (checkcase) 936 s = strstr (spec, name); 937 else 938 s = strcasestr (spec, name); 939 940 if (s != NULL) { 941 prev = (s == spec ? ',' : *(s - 1)); 942 next = *(s + strlen (name)); 943 944 if (prev == ',' && (next == '\0' || next == ',')) 945 /* Explicit match: skip iff the spec is an 946 exclusive one. */ 947 return exclude; 948 } 949 950 /* No explicit match for this name: skip the message iff 951 the spec is an inclusive one. */ 952 return !exclude; 953 } 954 955 /* 956 * Log a message to the appropriate log files, users, etc. based on 957 * the priority. 958 */ 959 static void 960 logmsg(int pri, const char *msg, const char *from, int flags) 961 { 962 struct filed *f; 963 int i, fac, msglen, omask, prilev; 964 const char *timestamp; 965 char prog[NAME_MAX+1]; 966 char buf[MAXLINE+1]; 967 968 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 969 pri, flags, from, msg); 970 971 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 972 973 /* 974 * Check to see if msg looks non-standard. 975 */ 976 msglen = strlen(msg); 977 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 978 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 979 flags |= ADDDATE; 980 981 (void)time(&now); 982 if (flags & ADDDATE) { 983 timestamp = ctime(&now) + 4; 984 } else { 985 timestamp = msg; 986 msg += 16; 987 msglen -= 16; 988 } 989 990 /* skip leading blanks */ 991 while (isspace(*msg)) { 992 msg++; 993 msglen--; 994 } 995 996 /* extract facility and priority level */ 997 if (flags & MARK) 998 fac = LOG_NFACILITIES; 999 else 1000 fac = LOG_FAC(pri); 1001 1002 /* Check maximum facility number. */ 1003 if (fac > LOG_NFACILITIES) { 1004 (void)sigsetmask(omask); 1005 return; 1006 } 1007 1008 prilev = LOG_PRI(pri); 1009 1010 /* extract program name */ 1011 for (i = 0; i < NAME_MAX; i++) { 1012 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 1013 msg[i] == '/' || isspace(msg[i])) 1014 break; 1015 prog[i] = msg[i]; 1016 } 1017 prog[i] = 0; 1018 1019 /* add kernel prefix for kernel messages */ 1020 if (flags & ISKERNEL) { 1021 snprintf(buf, sizeof(buf), "%s: %s", 1022 use_bootfile ? bootfile : "kernel", msg); 1023 msg = buf; 1024 msglen = strlen(buf); 1025 } 1026 1027 /* log the message to the particular outputs */ 1028 if (!Initialized) { 1029 f = &consfile; 1030 /* 1031 * Open in non-blocking mode to avoid hangs during open 1032 * and close(waiting for the port to drain). 1033 */ 1034 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1035 1036 if (f->f_file >= 0) { 1037 (void)strlcpy(f->f_lasttime, timestamp, 1038 sizeof(f->f_lasttime)); 1039 fprintlog(f, flags, msg); 1040 close(f->f_file); 1041 f->f_file = -1; 1042 } 1043 (void)sigsetmask(omask); 1044 return; 1045 } 1046 for (f = Files; f; f = f->f_next) { 1047 /* skip messages that are incorrect priority */ 1048 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1049 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1050 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1051 ) 1052 || f->f_pmask[fac] == INTERNAL_NOPRI) 1053 continue; 1054 1055 /* skip messages with the incorrect hostname */ 1056 if (skip_message(from, f->f_host, 0)) 1057 continue; 1058 1059 /* skip messages with the incorrect program name */ 1060 if (skip_message(prog, f->f_program, 1)) 1061 continue; 1062 1063 /* skip message to console if it has already been printed */ 1064 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1065 continue; 1066 1067 /* don't output marks to recently written files */ 1068 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1069 continue; 1070 1071 /* 1072 * suppress duplicate lines to this file 1073 */ 1074 if (no_compress - (f->f_type != F_PIPE) < 1 && 1075 (flags & MARK) == 0 && msglen == f->f_prevlen && 1076 !strcmp(msg, f->f_prevline) && 1077 !strcasecmp(from, f->f_prevhost)) { 1078 (void)strlcpy(f->f_lasttime, timestamp, 1079 sizeof(f->f_lasttime)); 1080 f->f_prevcount++; 1081 dprintf("msg repeated %d times, %ld sec of %d\n", 1082 f->f_prevcount, (long)(now - f->f_time), 1083 repeatinterval[f->f_repeatcount]); 1084 /* 1085 * If domark would have logged this by now, 1086 * flush it now (so we don't hold isolated messages), 1087 * but back off so we'll flush less often 1088 * in the future. 1089 */ 1090 if (now > REPEATTIME(f)) { 1091 fprintlog(f, flags, (char *)NULL); 1092 BACKOFF(f); 1093 } 1094 } else { 1095 /* new line, save it */ 1096 if (f->f_prevcount) 1097 fprintlog(f, 0, (char *)NULL); 1098 f->f_repeatcount = 0; 1099 f->f_prevpri = pri; 1100 (void)strlcpy(f->f_lasttime, timestamp, 1101 sizeof(f->f_lasttime)); 1102 (void)strlcpy(f->f_prevhost, from, 1103 sizeof(f->f_prevhost)); 1104 if (msglen < MAXSVLINE) { 1105 f->f_prevlen = msglen; 1106 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1107 fprintlog(f, flags, (char *)NULL); 1108 } else { 1109 f->f_prevline[0] = 0; 1110 f->f_prevlen = 0; 1111 fprintlog(f, flags, msg); 1112 } 1113 } 1114 } 1115 (void)sigsetmask(omask); 1116 } 1117 1118 static void 1119 dofsync(void) 1120 { 1121 struct filed *f; 1122 1123 for (f = Files; f; f = f->f_next) { 1124 if ((f->f_type == F_FILE) && 1125 (f->f_flags & FFLAG_NEEDSYNC)) { 1126 f->f_flags &= ~FFLAG_NEEDSYNC; 1127 (void)fsync(f->f_file); 1128 } 1129 } 1130 } 1131 1132 #define IOV_SIZE 7 1133 static void 1134 fprintlog(struct filed *f, int flags, const char *msg) 1135 { 1136 struct iovec iov[IOV_SIZE]; 1137 struct iovec *v; 1138 struct addrinfo *r; 1139 int i, l, lsent = 0; 1140 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1141 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1142 const char *msgret; 1143 1144 v = iov; 1145 if (f->f_type == F_WALL) { 1146 v->iov_base = greetings; 1147 /* The time displayed is not synchornized with the other log 1148 * destinations (like messages). Following fragment was using 1149 * ctime(&now), which was updating the time every 30 sec. 1150 * With f_lasttime, time is synchronized correctly. 1151 */ 1152 v->iov_len = snprintf(greetings, sizeof greetings, 1153 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1154 f->f_prevhost, f->f_lasttime); 1155 if (v->iov_len >= sizeof greetings) 1156 v->iov_len = sizeof greetings - 1; 1157 v++; 1158 v->iov_base = nul; 1159 v->iov_len = 0; 1160 v++; 1161 } else { 1162 v->iov_base = f->f_lasttime; 1163 v->iov_len = strlen(f->f_lasttime); 1164 v++; 1165 v->iov_base = space; 1166 v->iov_len = 1; 1167 v++; 1168 } 1169 1170 if (LogFacPri) { 1171 static char fp_buf[30]; /* Hollow laugh */ 1172 int fac = f->f_prevpri & LOG_FACMASK; 1173 int pri = LOG_PRI(f->f_prevpri); 1174 const char *f_s = NULL; 1175 char f_n[5]; /* Hollow laugh */ 1176 const char *p_s = NULL; 1177 char p_n[5]; /* Hollow laugh */ 1178 1179 if (LogFacPri > 1) { 1180 const CODE *c; 1181 1182 for (c = facilitynames; c->c_name; c++) { 1183 if (c->c_val == fac) { 1184 f_s = c->c_name; 1185 break; 1186 } 1187 } 1188 for (c = prioritynames; c->c_name; c++) { 1189 if (c->c_val == pri) { 1190 p_s = c->c_name; 1191 break; 1192 } 1193 } 1194 } 1195 if (!f_s) { 1196 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1197 f_s = f_n; 1198 } 1199 if (!p_s) { 1200 snprintf(p_n, sizeof p_n, "%d", pri); 1201 p_s = p_n; 1202 } 1203 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1204 v->iov_base = fp_buf; 1205 v->iov_len = strlen(fp_buf); 1206 } else { 1207 v->iov_base = nul; 1208 v->iov_len = 0; 1209 } 1210 v++; 1211 1212 v->iov_base = f->f_prevhost; 1213 v->iov_len = strlen(v->iov_base); 1214 v++; 1215 v->iov_base = space; 1216 v->iov_len = 1; 1217 v++; 1218 1219 if (msg) { 1220 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1221 if (wmsg == NULL) { 1222 logerror("strdup"); 1223 exit(1); 1224 } 1225 v->iov_base = wmsg; 1226 v->iov_len = strlen(msg); 1227 } else if (f->f_prevcount > 1) { 1228 v->iov_base = repbuf; 1229 v->iov_len = snprintf(repbuf, sizeof repbuf, 1230 "last message repeated %d times", f->f_prevcount); 1231 } else { 1232 v->iov_base = f->f_prevline; 1233 v->iov_len = f->f_prevlen; 1234 } 1235 v++; 1236 1237 dprintf("Logging to %s", TypeNames[f->f_type]); 1238 f->f_time = now; 1239 1240 switch (f->f_type) { 1241 int port; 1242 case F_UNUSED: 1243 dprintf("\n"); 1244 break; 1245 1246 case F_FORW: 1247 port = (int)ntohs(((struct sockaddr_in *) 1248 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1249 if (port != 514) { 1250 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1251 } else { 1252 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1253 } 1254 /* check for local vs remote messages */ 1255 if (strcasecmp(f->f_prevhost, LocalHostName)) 1256 l = snprintf(line, sizeof line - 1, 1257 "<%d>%.15s Forwarded from %s: %s", 1258 f->f_prevpri, (char *)iov[0].iov_base, 1259 f->f_prevhost, (char *)iov[5].iov_base); 1260 else 1261 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1262 f->f_prevpri, (char *)iov[0].iov_base, 1263 (char *)iov[5].iov_base); 1264 if (l < 0) 1265 l = 0; 1266 else if (l > MAXLINE) 1267 l = MAXLINE; 1268 1269 if (finet) { 1270 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1271 for (i = 0; i < *finet; i++) { 1272 #if 0 1273 /* 1274 * should we check AF first, or just 1275 * trial and error? FWD 1276 */ 1277 if (r->ai_family == 1278 address_family_of(finet[i+1])) 1279 #endif 1280 lsent = sendto(finet[i+1], line, l, 0, 1281 r->ai_addr, r->ai_addrlen); 1282 if (lsent == l) 1283 break; 1284 } 1285 if (lsent == l && !send_to_all) 1286 break; 1287 } 1288 dprintf("lsent/l: %d/%d\n", lsent, l); 1289 if (lsent != l) { 1290 int e = errno; 1291 logerror("sendto"); 1292 errno = e; 1293 switch (errno) { 1294 case ENOBUFS: 1295 case ENETDOWN: 1296 case ENETUNREACH: 1297 case EHOSTUNREACH: 1298 case EHOSTDOWN: 1299 case EADDRNOTAVAIL: 1300 break; 1301 /* case EBADF: */ 1302 /* case EACCES: */ 1303 /* case ENOTSOCK: */ 1304 /* case EFAULT: */ 1305 /* case EMSGSIZE: */ 1306 /* case EAGAIN: */ 1307 /* case ENOBUFS: */ 1308 /* case ECONNREFUSED: */ 1309 default: 1310 dprintf("removing entry: errno=%d\n", e); 1311 f->f_type = F_UNUSED; 1312 break; 1313 } 1314 } 1315 } 1316 break; 1317 1318 case F_FILE: 1319 dprintf(" %s\n", f->f_un.f_fname); 1320 v->iov_base = lf; 1321 v->iov_len = 1; 1322 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1323 /* 1324 * If writev(2) fails for potentially transient errors 1325 * like the filesystem being full, ignore it. 1326 * Otherwise remove this logfile from the list. 1327 */ 1328 if (errno != ENOSPC) { 1329 int e = errno; 1330 close_filed(f); 1331 errno = e; 1332 logerror(f->f_un.f_fname); 1333 } 1334 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1335 f->f_flags |= FFLAG_NEEDSYNC; 1336 needdofsync = 1; 1337 } 1338 break; 1339 1340 case F_PIPE: 1341 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1342 v->iov_base = lf; 1343 v->iov_len = 1; 1344 if (f->f_un.f_pipe.f_pid == 0) { 1345 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1346 &f->f_un.f_pipe.f_pid)) < 0) { 1347 f->f_type = F_UNUSED; 1348 logerror(f->f_un.f_pipe.f_pname); 1349 break; 1350 } 1351 } 1352 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1353 int e = errno; 1354 close_filed(f); 1355 if (f->f_un.f_pipe.f_pid > 0) 1356 deadq_enter(f->f_un.f_pipe.f_pid, 1357 f->f_un.f_pipe.f_pname); 1358 f->f_un.f_pipe.f_pid = 0; 1359 errno = e; 1360 logerror(f->f_un.f_pipe.f_pname); 1361 } 1362 break; 1363 1364 case F_CONSOLE: 1365 if (flags & IGN_CONS) { 1366 dprintf(" (ignored)\n"); 1367 break; 1368 } 1369 /* FALLTHROUGH */ 1370 1371 case F_TTY: 1372 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1373 v->iov_base = crlf; 1374 v->iov_len = 2; 1375 1376 errno = 0; /* ttymsg() only sometimes returns an errno */ 1377 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1378 f->f_type = F_UNUSED; 1379 logerror(msgret); 1380 } 1381 break; 1382 1383 case F_USERS: 1384 case F_WALL: 1385 dprintf("\n"); 1386 v->iov_base = crlf; 1387 v->iov_len = 2; 1388 wallmsg(f, iov, IOV_SIZE); 1389 break; 1390 } 1391 f->f_prevcount = 0; 1392 free(wmsg); 1393 } 1394 1395 /* 1396 * WALLMSG -- Write a message to the world at large 1397 * 1398 * Write the specified message to either the entire 1399 * world, or a list of approved users. 1400 */ 1401 static void 1402 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1403 { 1404 static int reenter; /* avoid calling ourselves */ 1405 struct utmpx *ut; 1406 int i; 1407 const char *p; 1408 1409 if (reenter++) 1410 return; 1411 setutxent(); 1412 /* NOSTRICT */ 1413 while ((ut = getutxent()) != NULL) { 1414 if (ut->ut_type != USER_PROCESS) 1415 continue; 1416 if (f->f_type == F_WALL) { 1417 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1418 TTYMSGTIME)) != NULL) { 1419 errno = 0; /* already in msg */ 1420 logerror(p); 1421 } 1422 continue; 1423 } 1424 /* should we send the message to this user? */ 1425 for (i = 0; i < MAXUNAMES; i++) { 1426 if (!f->f_un.f_uname[i][0]) 1427 break; 1428 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1429 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 1430 TTYMSGTIME)) != NULL) { 1431 errno = 0; /* already in msg */ 1432 logerror(p); 1433 } 1434 break; 1435 } 1436 } 1437 } 1438 endutxent(); 1439 reenter = 0; 1440 } 1441 1442 /* 1443 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 1444 */ 1445 static const char * 1446 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 1447 { 1448 static char device[1024]; 1449 static char errbuf[1024]; 1450 struct stat sb; 1451 1452 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 1453 1454 if (stat(device, &sb) < 0) { 1455 (void) snprintf(errbuf, sizeof(errbuf), 1456 "%s: %s", device, strerror(errno)); 1457 return (errbuf); 1458 } 1459 if ((sb.st_mode & S_IWGRP) == 0) 1460 /* Messages disabled. */ 1461 return (NULL); 1462 return ttymsg(iov, iovcnt, line, tmout); 1463 } 1464 1465 static void 1466 reapchild(int signo __unused) 1467 { 1468 int status; 1469 pid_t pid; 1470 struct filed *f; 1471 1472 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1473 if (!Initialized) 1474 /* Don't tell while we are initting. */ 1475 continue; 1476 1477 /* First, look if it's a process from the dead queue. */ 1478 if (deadq_remove(pid)) 1479 goto oncemore; 1480 1481 /* Now, look in list of active processes. */ 1482 for (f = Files; f; f = f->f_next) 1483 if (f->f_type == F_PIPE && 1484 f->f_un.f_pipe.f_pid == pid) { 1485 close_filed(f); 1486 f->f_un.f_pipe.f_pid = 0; 1487 log_deadchild(pid, status, 1488 f->f_un.f_pipe.f_pname); 1489 break; 1490 } 1491 oncemore: 1492 continue; 1493 } 1494 } 1495 1496 /* 1497 * Return a printable representation of a host address. 1498 */ 1499 static const char * 1500 cvthname(struct sockaddr *f) 1501 { 1502 int error, hl; 1503 sigset_t omask, nmask; 1504 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1505 1506 error = getnameinfo((struct sockaddr *)f, 1507 ((struct sockaddr *)f)->sa_len, 1508 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1509 dprintf("cvthname(%s)\n", ip); 1510 1511 if (error) { 1512 dprintf("Malformed from address %s\n", gai_strerror(error)); 1513 return ("???"); 1514 } 1515 if (!resolve) 1516 return (ip); 1517 1518 sigemptyset(&nmask); 1519 sigaddset(&nmask, SIGHUP); 1520 sigprocmask(SIG_BLOCK, &nmask, &omask); 1521 error = getnameinfo((struct sockaddr *)f, 1522 ((struct sockaddr *)f)->sa_len, 1523 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1524 sigprocmask(SIG_SETMASK, &omask, NULL); 1525 if (error) { 1526 dprintf("Host name for your address (%s) unknown\n", ip); 1527 return (ip); 1528 } 1529 hl = strlen(hname); 1530 if (hl > 0 && hname[hl-1] == '.') 1531 hname[--hl] = '\0'; 1532 trimdomain(hname, hl); 1533 return (hname); 1534 } 1535 1536 static void 1537 dodie(int signo) 1538 { 1539 1540 WantDie = signo; 1541 } 1542 1543 static void 1544 domark(int signo __unused) 1545 { 1546 1547 MarkSet = 1; 1548 } 1549 1550 /* 1551 * Print syslogd errors some place. 1552 */ 1553 static void 1554 logerror(const char *type) 1555 { 1556 char buf[512]; 1557 static int recursed = 0; 1558 1559 /* If there's an error while trying to log an error, give up. */ 1560 if (recursed) 1561 return; 1562 recursed++; 1563 if (errno) 1564 (void)snprintf(buf, 1565 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1566 else 1567 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1568 errno = 0; 1569 dprintf("%s\n", buf); 1570 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1571 recursed--; 1572 } 1573 1574 static void 1575 die(int signo) 1576 { 1577 struct filed *f; 1578 struct funix *fx; 1579 int was_initialized; 1580 char buf[100]; 1581 1582 was_initialized = Initialized; 1583 Initialized = 0; /* Don't log SIGCHLDs. */ 1584 for (f = Files; f != NULL; f = f->f_next) { 1585 /* flush any pending output */ 1586 if (f->f_prevcount) 1587 fprintlog(f, 0, (char *)NULL); 1588 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1589 close_filed(f); 1590 f->f_un.f_pipe.f_pid = 0; 1591 } 1592 } 1593 Initialized = was_initialized; 1594 if (signo) { 1595 dprintf("syslogd: exiting on signal %d\n", signo); 1596 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1597 errno = 0; 1598 logerror(buf); 1599 } 1600 STAILQ_FOREACH(fx, &funixes, next) 1601 (void)unlink(fx->name); 1602 pidfile_remove(pfh); 1603 1604 exit(1); 1605 } 1606 1607 /* 1608 * INIT -- Initialize syslogd from configuration table 1609 */ 1610 static void 1611 init(int signo) 1612 { 1613 int i; 1614 FILE *cf; 1615 struct filed *f, *next, **nextp; 1616 char *p; 1617 char cline[LINE_MAX]; 1618 char prog[LINE_MAX]; 1619 char host[MAXHOSTNAMELEN]; 1620 char oldLocalHostName[MAXHOSTNAMELEN]; 1621 char hostMsg[2*MAXHOSTNAMELEN+40]; 1622 char bootfileMsg[LINE_MAX]; 1623 1624 dprintf("init\n"); 1625 1626 /* 1627 * Load hostname (may have changed). 1628 */ 1629 if (signo != 0) 1630 (void)strlcpy(oldLocalHostName, LocalHostName, 1631 sizeof(oldLocalHostName)); 1632 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1633 err(EX_OSERR, "gethostname() failed"); 1634 if ((p = strchr(LocalHostName, '.')) != NULL) { 1635 *p++ = '\0'; 1636 LocalDomain = p; 1637 } else { 1638 LocalDomain = ""; 1639 } 1640 1641 /* 1642 * Load / reload timezone data (in case it changed). 1643 * 1644 * Just calling tzset() again does not work, the timezone code 1645 * caches the result. However, by setting the TZ variable, one 1646 * can defeat the caching and have the timezone code really 1647 * reload the timezone data. Respect any initial setting of 1648 * TZ, in case the system is configured specially. 1649 */ 1650 dprintf("loading timezone data via tzset()\n"); 1651 if (getenv("TZ")) { 1652 tzset(); 1653 } else { 1654 setenv("TZ", ":/etc/localtime", 1); 1655 tzset(); 1656 unsetenv("TZ"); 1657 } 1658 1659 /* 1660 * Close all open log files. 1661 */ 1662 Initialized = 0; 1663 for (f = Files; f != NULL; f = next) { 1664 /* flush any pending output */ 1665 if (f->f_prevcount) 1666 fprintlog(f, 0, (char *)NULL); 1667 1668 switch (f->f_type) { 1669 case F_FILE: 1670 case F_FORW: 1671 case F_CONSOLE: 1672 case F_TTY: 1673 close_filed(f); 1674 break; 1675 case F_PIPE: 1676 if (f->f_un.f_pipe.f_pid > 0) { 1677 close_filed(f); 1678 deadq_enter(f->f_un.f_pipe.f_pid, 1679 f->f_un.f_pipe.f_pname); 1680 } 1681 f->f_un.f_pipe.f_pid = 0; 1682 break; 1683 } 1684 next = f->f_next; 1685 if (f->f_program) free(f->f_program); 1686 if (f->f_host) free(f->f_host); 1687 free((char *)f); 1688 } 1689 Files = NULL; 1690 nextp = &Files; 1691 1692 /* open the configuration file */ 1693 if ((cf = fopen(ConfFile, "r")) == NULL) { 1694 dprintf("cannot open %s\n", ConfFile); 1695 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1696 if (*nextp == NULL) { 1697 logerror("calloc"); 1698 exit(1); 1699 } 1700 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1701 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1702 if ((*nextp)->f_next == NULL) { 1703 logerror("calloc"); 1704 exit(1); 1705 } 1706 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1707 Initialized = 1; 1708 return; 1709 } 1710 1711 /* 1712 * Foreach line in the conf table, open that file. 1713 */ 1714 f = NULL; 1715 (void)strlcpy(host, "*", sizeof(host)); 1716 (void)strlcpy(prog, "*", sizeof(prog)); 1717 while (fgets(cline, sizeof(cline), cf) != NULL) { 1718 /* 1719 * check for end-of-section, comments, strip off trailing 1720 * spaces and newline character. #!prog is treated specially: 1721 * following lines apply only to that program. 1722 */ 1723 for (p = cline; isspace(*p); ++p) 1724 continue; 1725 if (*p == 0) 1726 continue; 1727 if (*p == '#') { 1728 p++; 1729 if (*p != '!' && *p != '+' && *p != '-') 1730 continue; 1731 } 1732 if (*p == '+' || *p == '-') { 1733 host[0] = *p++; 1734 while (isspace(*p)) 1735 p++; 1736 if ((!*p) || (*p == '*')) { 1737 (void)strlcpy(host, "*", sizeof(host)); 1738 continue; 1739 } 1740 if (*p == '@') 1741 p = LocalHostName; 1742 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1743 if (!isalnum(*p) && *p != '.' && *p != '-' 1744 && *p != ',' && *p != ':' && *p != '%') 1745 break; 1746 host[i] = *p++; 1747 } 1748 host[i] = '\0'; 1749 continue; 1750 } 1751 if (*p == '!') { 1752 p++; 1753 while (isspace(*p)) p++; 1754 if ((!*p) || (*p == '*')) { 1755 (void)strlcpy(prog, "*", sizeof(prog)); 1756 continue; 1757 } 1758 for (i = 0; i < LINE_MAX - 1; i++) { 1759 if (!isprint(p[i]) || isspace(p[i])) 1760 break; 1761 prog[i] = p[i]; 1762 } 1763 prog[i] = 0; 1764 continue; 1765 } 1766 for (p = cline + 1; *p != '\0'; p++) { 1767 if (*p != '#') 1768 continue; 1769 if (*(p - 1) == '\\') { 1770 strcpy(p - 1, p); 1771 p--; 1772 continue; 1773 } 1774 *p = '\0'; 1775 break; 1776 } 1777 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1778 cline[i] = '\0'; 1779 f = (struct filed *)calloc(1, sizeof(*f)); 1780 if (f == NULL) { 1781 logerror("calloc"); 1782 exit(1); 1783 } 1784 *nextp = f; 1785 nextp = &f->f_next; 1786 cfline(cline, f, prog, host); 1787 } 1788 1789 /* close the configuration file */ 1790 (void)fclose(cf); 1791 1792 Initialized = 1; 1793 1794 if (Debug) { 1795 int port; 1796 for (f = Files; f; f = f->f_next) { 1797 for (i = 0; i <= LOG_NFACILITIES; i++) 1798 if (f->f_pmask[i] == INTERNAL_NOPRI) 1799 printf("X "); 1800 else 1801 printf("%d ", f->f_pmask[i]); 1802 printf("%s: ", TypeNames[f->f_type]); 1803 switch (f->f_type) { 1804 case F_FILE: 1805 printf("%s", f->f_un.f_fname); 1806 break; 1807 1808 case F_CONSOLE: 1809 case F_TTY: 1810 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1811 break; 1812 1813 case F_FORW: 1814 port = (int)ntohs(((struct sockaddr_in *) 1815 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1816 if (port != 514) { 1817 printf("%s:%d", 1818 f->f_un.f_forw.f_hname, port); 1819 } else { 1820 printf("%s", f->f_un.f_forw.f_hname); 1821 } 1822 break; 1823 1824 case F_PIPE: 1825 printf("%s", f->f_un.f_pipe.f_pname); 1826 break; 1827 1828 case F_USERS: 1829 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1830 printf("%s, ", f->f_un.f_uname[i]); 1831 break; 1832 } 1833 if (f->f_program) 1834 printf(" (%s)", f->f_program); 1835 printf("\n"); 1836 } 1837 } 1838 1839 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1840 dprintf("syslogd: restarted\n"); 1841 /* 1842 * Log a change in hostname, but only on a restart. 1843 */ 1844 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1845 (void)snprintf(hostMsg, sizeof(hostMsg), 1846 "syslogd: hostname changed, \"%s\" to \"%s\"", 1847 oldLocalHostName, LocalHostName); 1848 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1849 dprintf("%s\n", hostMsg); 1850 } 1851 /* 1852 * Log the kernel boot file if we aren't going to use it as 1853 * the prefix, and if this is *not* a restart. 1854 */ 1855 if (signo == 0 && !use_bootfile) { 1856 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1857 "syslogd: kernel boot file is %s", bootfile); 1858 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1859 dprintf("%s\n", bootfileMsg); 1860 } 1861 } 1862 1863 /* 1864 * Crack a configuration file line 1865 */ 1866 static void 1867 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1868 { 1869 struct addrinfo hints, *res; 1870 int error, i, pri, syncfile; 1871 const char *p, *q; 1872 char *bp; 1873 char buf[MAXLINE], ebuf[100]; 1874 1875 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1876 1877 errno = 0; /* keep strerror() stuff out of logerror messages */ 1878 1879 /* clear out file entry */ 1880 memset(f, 0, sizeof(*f)); 1881 for (i = 0; i <= LOG_NFACILITIES; i++) 1882 f->f_pmask[i] = INTERNAL_NOPRI; 1883 1884 /* save hostname if any */ 1885 if (host && *host == '*') 1886 host = NULL; 1887 if (host) { 1888 int hl; 1889 1890 f->f_host = strdup(host); 1891 if (f->f_host == NULL) { 1892 logerror("strdup"); 1893 exit(1); 1894 } 1895 hl = strlen(f->f_host); 1896 if (hl > 0 && f->f_host[hl-1] == '.') 1897 f->f_host[--hl] = '\0'; 1898 trimdomain(f->f_host, hl); 1899 } 1900 1901 /* save program name if any */ 1902 if (prog && *prog == '*') 1903 prog = NULL; 1904 if (prog) { 1905 f->f_program = strdup(prog); 1906 if (f->f_program == NULL) { 1907 logerror("strdup"); 1908 exit(1); 1909 } 1910 } 1911 1912 /* scan through the list of selectors */ 1913 for (p = line; *p && *p != '\t' && *p != ' ';) { 1914 int pri_done; 1915 int pri_cmp; 1916 int pri_invert; 1917 1918 /* find the end of this facility name list */ 1919 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1920 continue; 1921 1922 /* get the priority comparison */ 1923 pri_cmp = 0; 1924 pri_done = 0; 1925 pri_invert = 0; 1926 if (*q == '!') { 1927 pri_invert = 1; 1928 q++; 1929 } 1930 while (!pri_done) { 1931 switch (*q) { 1932 case '<': 1933 pri_cmp |= PRI_LT; 1934 q++; 1935 break; 1936 case '=': 1937 pri_cmp |= PRI_EQ; 1938 q++; 1939 break; 1940 case '>': 1941 pri_cmp |= PRI_GT; 1942 q++; 1943 break; 1944 default: 1945 pri_done++; 1946 break; 1947 } 1948 } 1949 1950 /* collect priority name */ 1951 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1952 *bp++ = *q++; 1953 *bp = '\0'; 1954 1955 /* skip cruft */ 1956 while (strchr(",;", *q)) 1957 q++; 1958 1959 /* decode priority name */ 1960 if (*buf == '*') { 1961 pri = LOG_PRIMASK; 1962 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1963 } else { 1964 /* Ignore trailing spaces. */ 1965 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1966 buf[i] = '\0'; 1967 1968 pri = decode(buf, prioritynames); 1969 if (pri < 0) { 1970 errno = 0; 1971 (void)snprintf(ebuf, sizeof ebuf, 1972 "unknown priority name \"%s\"", buf); 1973 logerror(ebuf); 1974 return; 1975 } 1976 } 1977 if (!pri_cmp) 1978 pri_cmp = (UniquePriority) 1979 ? (PRI_EQ) 1980 : (PRI_EQ | PRI_GT) 1981 ; 1982 if (pri_invert) 1983 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1984 1985 /* scan facilities */ 1986 while (*p && !strchr("\t.; ", *p)) { 1987 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1988 *bp++ = *p++; 1989 *bp = '\0'; 1990 1991 if (*buf == '*') { 1992 for (i = 0; i < LOG_NFACILITIES; i++) { 1993 f->f_pmask[i] = pri; 1994 f->f_pcmp[i] = pri_cmp; 1995 } 1996 } else { 1997 i = decode(buf, facilitynames); 1998 if (i < 0) { 1999 errno = 0; 2000 (void)snprintf(ebuf, sizeof ebuf, 2001 "unknown facility name \"%s\"", 2002 buf); 2003 logerror(ebuf); 2004 return; 2005 } 2006 f->f_pmask[i >> 3] = pri; 2007 f->f_pcmp[i >> 3] = pri_cmp; 2008 } 2009 while (*p == ',' || *p == ' ') 2010 p++; 2011 } 2012 2013 p = q; 2014 } 2015 2016 /* skip to action part */ 2017 while (*p == '\t' || *p == ' ') 2018 p++; 2019 2020 if (*p == '-') { 2021 syncfile = 0; 2022 p++; 2023 } else 2024 syncfile = 1; 2025 2026 switch (*p) { 2027 case '@': 2028 { 2029 char *tp; 2030 char endkey = ':'; 2031 /* 2032 * scan forward to see if there is a port defined. 2033 * so we can't use strlcpy.. 2034 */ 2035 i = sizeof(f->f_un.f_forw.f_hname); 2036 tp = f->f_un.f_forw.f_hname; 2037 p++; 2038 2039 /* 2040 * an ipv6 address should start with a '[' in that case 2041 * we should scan for a ']' 2042 */ 2043 if (*p == '[') { 2044 p++; 2045 endkey = ']'; 2046 } 2047 while (*p && (*p != endkey) && (i-- > 0)) { 2048 *tp++ = *p++; 2049 } 2050 if (endkey == ']' && *p == endkey) 2051 p++; 2052 *tp = '\0'; 2053 } 2054 /* See if we copied a domain and have a port */ 2055 if (*p == ':') 2056 p++; 2057 else 2058 p = NULL; 2059 2060 memset(&hints, 0, sizeof(hints)); 2061 hints.ai_family = family; 2062 hints.ai_socktype = SOCK_DGRAM; 2063 error = getaddrinfo(f->f_un.f_forw.f_hname, 2064 p ? p : "syslog", &hints, &res); 2065 if (error) { 2066 logerror(gai_strerror(error)); 2067 break; 2068 } 2069 f->f_un.f_forw.f_addr = res; 2070 f->f_type = F_FORW; 2071 break; 2072 2073 case '/': 2074 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2075 f->f_type = F_UNUSED; 2076 logerror(p); 2077 break; 2078 } 2079 if (syncfile) 2080 f->f_flags |= FFLAG_SYNC; 2081 if (isatty(f->f_file)) { 2082 if (strcmp(p, ctty) == 0) 2083 f->f_type = F_CONSOLE; 2084 else 2085 f->f_type = F_TTY; 2086 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 2087 sizeof(f->f_un.f_fname)); 2088 } else { 2089 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2090 f->f_type = F_FILE; 2091 } 2092 break; 2093 2094 case '|': 2095 f->f_un.f_pipe.f_pid = 0; 2096 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2097 sizeof(f->f_un.f_pipe.f_pname)); 2098 f->f_type = F_PIPE; 2099 break; 2100 2101 case '*': 2102 f->f_type = F_WALL; 2103 break; 2104 2105 default: 2106 for (i = 0; i < MAXUNAMES && *p; i++) { 2107 for (q = p; *q && *q != ','; ) 2108 q++; 2109 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2110 if ((q - p) >= MAXLOGNAME) 2111 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2112 else 2113 f->f_un.f_uname[i][q - p] = '\0'; 2114 while (*q == ',' || *q == ' ') 2115 q++; 2116 p = q; 2117 } 2118 f->f_type = F_USERS; 2119 break; 2120 } 2121 } 2122 2123 2124 /* 2125 * Decode a symbolic name to a numeric value 2126 */ 2127 static int 2128 decode(const char *name, const CODE *codetab) 2129 { 2130 const CODE *c; 2131 char *p, buf[40]; 2132 2133 if (isdigit(*name)) 2134 return (atoi(name)); 2135 2136 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2137 if (isupper(*name)) 2138 *p = tolower(*name); 2139 else 2140 *p = *name; 2141 } 2142 *p = '\0'; 2143 for (c = codetab; c->c_name; c++) 2144 if (!strcmp(buf, c->c_name)) 2145 return (c->c_val); 2146 2147 return (-1); 2148 } 2149 2150 static void 2151 markit(void) 2152 { 2153 struct filed *f; 2154 dq_t q, next; 2155 2156 now = time((time_t *)NULL); 2157 MarkSeq += TIMERINTVL; 2158 if (MarkSeq >= MarkInterval) { 2159 logmsg(LOG_INFO, "-- MARK --", 2160 LocalHostName, ADDDATE|MARK); 2161 MarkSeq = 0; 2162 } 2163 2164 for (f = Files; f; f = f->f_next) { 2165 if (f->f_prevcount && now >= REPEATTIME(f)) { 2166 dprintf("flush %s: repeated %d times, %d sec.\n", 2167 TypeNames[f->f_type], f->f_prevcount, 2168 repeatinterval[f->f_repeatcount]); 2169 fprintlog(f, 0, (char *)NULL); 2170 BACKOFF(f); 2171 } 2172 } 2173 2174 /* Walk the dead queue, and see if we should signal somebody. */ 2175 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2176 next = TAILQ_NEXT(q, dq_entries); 2177 2178 switch (q->dq_timeout) { 2179 case 0: 2180 /* Already signalled once, try harder now. */ 2181 if (kill(q->dq_pid, SIGKILL) != 0) 2182 (void)deadq_remove(q->dq_pid); 2183 break; 2184 2185 case 1: 2186 /* 2187 * Timed out on dead queue, send terminate 2188 * signal. Note that we leave the removal 2189 * from the dead queue to reapchild(), which 2190 * will also log the event (unless the process 2191 * didn't even really exist, in case we simply 2192 * drop it from the dead queue). 2193 */ 2194 if (kill(q->dq_pid, SIGTERM) != 0) 2195 (void)deadq_remove(q->dq_pid); 2196 /* FALLTHROUGH */ 2197 2198 default: 2199 q->dq_timeout--; 2200 } 2201 } 2202 MarkSet = 0; 2203 (void)alarm(TIMERINTVL); 2204 } 2205 2206 /* 2207 * fork off and become a daemon, but wait for the child to come online 2208 * before returing to the parent, or we get disk thrashing at boot etc. 2209 * Set a timer so we don't hang forever if it wedges. 2210 */ 2211 static int 2212 waitdaemon(int nochdir, int noclose, int maxwait) 2213 { 2214 int fd; 2215 int status; 2216 pid_t pid, childpid; 2217 2218 switch (childpid = fork()) { 2219 case -1: 2220 return (-1); 2221 case 0: 2222 break; 2223 default: 2224 signal(SIGALRM, timedout); 2225 alarm(maxwait); 2226 while ((pid = wait3(&status, 0, NULL)) != -1) { 2227 if (WIFEXITED(status)) 2228 errx(1, "child pid %d exited with return code %d", 2229 pid, WEXITSTATUS(status)); 2230 if (WIFSIGNALED(status)) 2231 errx(1, "child pid %d exited on signal %d%s", 2232 pid, WTERMSIG(status), 2233 WCOREDUMP(status) ? " (core dumped)" : 2234 ""); 2235 if (pid == childpid) /* it's gone... */ 2236 break; 2237 } 2238 exit(0); 2239 } 2240 2241 if (setsid() == -1) 2242 return (-1); 2243 2244 if (!nochdir) 2245 (void)chdir("/"); 2246 2247 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2248 (void)dup2(fd, STDIN_FILENO); 2249 (void)dup2(fd, STDOUT_FILENO); 2250 (void)dup2(fd, STDERR_FILENO); 2251 if (fd > 2) 2252 (void)close (fd); 2253 } 2254 return (getppid()); 2255 } 2256 2257 /* 2258 * We get a SIGALRM from the child when it's running and finished doing it's 2259 * fsync()'s or O_SYNC writes for all the boot messages. 2260 * 2261 * We also get a signal from the kernel if the timer expires, so check to 2262 * see what happened. 2263 */ 2264 static void 2265 timedout(int sig __unused) 2266 { 2267 int left; 2268 left = alarm(0); 2269 signal(SIGALRM, SIG_DFL); 2270 if (left == 0) 2271 errx(1, "timed out waiting for child"); 2272 else 2273 _exit(0); 2274 } 2275 2276 /* 2277 * Add `s' to the list of allowable peer addresses to accept messages 2278 * from. 2279 * 2280 * `s' is a string in the form: 2281 * 2282 * [*]domainname[:{servicename|portnumber|*}] 2283 * 2284 * or 2285 * 2286 * netaddr/maskbits[:{servicename|portnumber|*}] 2287 * 2288 * Returns -1 on error, 0 if the argument was valid. 2289 */ 2290 static int 2291 allowaddr(char *s) 2292 { 2293 char *cp1, *cp2; 2294 struct allowedpeer ap; 2295 struct servent *se; 2296 int masklen = -1; 2297 struct addrinfo hints, *res; 2298 struct in_addr *addrp, *maskp; 2299 #ifdef INET6 2300 int i; 2301 u_int32_t *addr6p, *mask6p; 2302 #endif 2303 char ip[NI_MAXHOST]; 2304 2305 #ifdef INET6 2306 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2307 #endif 2308 cp1 = s; 2309 if ((cp1 = strrchr(cp1, ':'))) { 2310 /* service/port provided */ 2311 *cp1++ = '\0'; 2312 if (strlen(cp1) == 1 && *cp1 == '*') 2313 /* any port allowed */ 2314 ap.port = 0; 2315 else if ((se = getservbyname(cp1, "udp"))) { 2316 ap.port = ntohs(se->s_port); 2317 } else { 2318 ap.port = strtol(cp1, &cp2, 0); 2319 if (*cp2 != '\0') 2320 return (-1); /* port not numeric */ 2321 } 2322 } else { 2323 if ((se = getservbyname("syslog", "udp"))) 2324 ap.port = ntohs(se->s_port); 2325 else 2326 /* sanity, should not happen */ 2327 ap.port = 514; 2328 } 2329 2330 if ((cp1 = strchr(s, '/')) != NULL && 2331 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2332 *cp1 = '\0'; 2333 if ((masklen = atoi(cp1 + 1)) < 0) 2334 return (-1); 2335 } 2336 #ifdef INET6 2337 if (*s == '[') { 2338 cp2 = s + strlen(s) - 1; 2339 if (*cp2 == ']') { 2340 ++s; 2341 *cp2 = '\0'; 2342 } else { 2343 cp2 = NULL; 2344 } 2345 } else { 2346 cp2 = NULL; 2347 } 2348 #endif 2349 memset(&hints, 0, sizeof(hints)); 2350 hints.ai_family = PF_UNSPEC; 2351 hints.ai_socktype = SOCK_DGRAM; 2352 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2353 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2354 ap.isnumeric = 1; 2355 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2356 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2357 ap.a_mask.ss_family = res->ai_family; 2358 if (res->ai_family == AF_INET) { 2359 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2360 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2361 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2362 if (masklen < 0) { 2363 /* use default netmask */ 2364 if (IN_CLASSA(ntohl(addrp->s_addr))) 2365 maskp->s_addr = htonl(IN_CLASSA_NET); 2366 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2367 maskp->s_addr = htonl(IN_CLASSB_NET); 2368 else 2369 maskp->s_addr = htonl(IN_CLASSC_NET); 2370 } else if (masklen <= 32) { 2371 /* convert masklen to netmask */ 2372 if (masklen == 0) 2373 maskp->s_addr = 0; 2374 else 2375 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2376 } else { 2377 freeaddrinfo(res); 2378 return (-1); 2379 } 2380 /* Lose any host bits in the network number. */ 2381 addrp->s_addr &= maskp->s_addr; 2382 } 2383 #ifdef INET6 2384 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2385 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2386 if (masklen < 0) 2387 masklen = 128; 2388 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2389 /* convert masklen to netmask */ 2390 while (masklen > 0) { 2391 if (masklen < 32) { 2392 *mask6p = htonl(~(0xffffffff >> masklen)); 2393 break; 2394 } 2395 *mask6p++ = 0xffffffff; 2396 masklen -= 32; 2397 } 2398 /* Lose any host bits in the network number. */ 2399 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2400 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2401 for (i = 0; i < 4; i++) 2402 addr6p[i] &= mask6p[i]; 2403 } 2404 #endif 2405 else { 2406 freeaddrinfo(res); 2407 return (-1); 2408 } 2409 freeaddrinfo(res); 2410 } else { 2411 /* arg `s' is domain name */ 2412 ap.isnumeric = 0; 2413 ap.a_name = s; 2414 if (cp1) 2415 *cp1 = '/'; 2416 #ifdef INET6 2417 if (cp2) { 2418 *cp2 = ']'; 2419 --s; 2420 } 2421 #endif 2422 } 2423 2424 if (Debug) { 2425 printf("allowaddr: rule %d: ", NumAllowed); 2426 if (ap.isnumeric) { 2427 printf("numeric, "); 2428 getnameinfo((struct sockaddr *)&ap.a_addr, 2429 ((struct sockaddr *)&ap.a_addr)->sa_len, 2430 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2431 printf("addr = %s, ", ip); 2432 getnameinfo((struct sockaddr *)&ap.a_mask, 2433 ((struct sockaddr *)&ap.a_mask)->sa_len, 2434 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2435 printf("mask = %s; ", ip); 2436 } else { 2437 printf("domainname = %s; ", ap.a_name); 2438 } 2439 printf("port = %d\n", ap.port); 2440 } 2441 2442 if ((AllowedPeers = realloc(AllowedPeers, 2443 ++NumAllowed * sizeof(struct allowedpeer))) 2444 == NULL) { 2445 logerror("realloc"); 2446 exit(1); 2447 } 2448 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2449 return (0); 2450 } 2451 2452 /* 2453 * Validate that the remote peer has permission to log to us. 2454 */ 2455 static int 2456 validate(struct sockaddr *sa, const char *hname) 2457 { 2458 int i; 2459 size_t l1, l2; 2460 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2461 struct allowedpeer *ap; 2462 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2463 #ifdef INET6 2464 int j, reject; 2465 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2466 #endif 2467 struct addrinfo hints, *res; 2468 u_short sport; 2469 2470 if (NumAllowed == 0) 2471 /* traditional behaviour, allow everything */ 2472 return (1); 2473 2474 (void)strlcpy(name, hname, sizeof(name)); 2475 memset(&hints, 0, sizeof(hints)); 2476 hints.ai_family = PF_UNSPEC; 2477 hints.ai_socktype = SOCK_DGRAM; 2478 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2479 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2480 freeaddrinfo(res); 2481 else if (strchr(name, '.') == NULL) { 2482 strlcat(name, ".", sizeof name); 2483 strlcat(name, LocalDomain, sizeof name); 2484 } 2485 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2486 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2487 return (0); /* for safety, should not occur */ 2488 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2489 ip, port, name); 2490 sport = atoi(port); 2491 2492 /* now, walk down the list */ 2493 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2494 if (ap->port != 0 && ap->port != sport) { 2495 dprintf("rejected in rule %d due to port mismatch.\n", i); 2496 continue; 2497 } 2498 2499 if (ap->isnumeric) { 2500 if (ap->a_addr.ss_family != sa->sa_family) { 2501 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2502 continue; 2503 } 2504 if (ap->a_addr.ss_family == AF_INET) { 2505 sin4 = (struct sockaddr_in *)sa; 2506 a4p = (struct sockaddr_in *)&ap->a_addr; 2507 m4p = (struct sockaddr_in *)&ap->a_mask; 2508 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2509 != a4p->sin_addr.s_addr) { 2510 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2511 continue; 2512 } 2513 } 2514 #ifdef INET6 2515 else if (ap->a_addr.ss_family == AF_INET6) { 2516 sin6 = (struct sockaddr_in6 *)sa; 2517 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2518 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2519 if (a6p->sin6_scope_id != 0 && 2520 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2521 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2522 continue; 2523 } 2524 reject = 0; 2525 for (j = 0; j < 16; j += 4) { 2526 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2527 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2528 ++reject; 2529 break; 2530 } 2531 } 2532 if (reject) { 2533 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2534 continue; 2535 } 2536 } 2537 #endif 2538 else 2539 continue; 2540 } else { 2541 cp = ap->a_name; 2542 l1 = strlen(name); 2543 if (*cp == '*') { 2544 /* allow wildmatch */ 2545 cp++; 2546 l2 = strlen(cp); 2547 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2548 dprintf("rejected in rule %d due to name mismatch.\n", i); 2549 continue; 2550 } 2551 } else { 2552 /* exact match */ 2553 l2 = strlen(cp); 2554 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2555 dprintf("rejected in rule %d due to name mismatch.\n", i); 2556 continue; 2557 } 2558 } 2559 } 2560 dprintf("accepted in rule %d.\n", i); 2561 return (1); /* hooray! */ 2562 } 2563 return (0); 2564 } 2565 2566 /* 2567 * Fairly similar to popen(3), but returns an open descriptor, as 2568 * opposed to a FILE *. 2569 */ 2570 static int 2571 p_open(const char *prog, pid_t *rpid) 2572 { 2573 int pfd[2], nulldesc; 2574 pid_t pid; 2575 sigset_t omask, mask; 2576 char *argv[4]; /* sh -c cmd NULL */ 2577 char errmsg[200]; 2578 2579 if (pipe(pfd) == -1) 2580 return (-1); 2581 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2582 /* we are royally screwed anyway */ 2583 return (-1); 2584 2585 sigemptyset(&mask); 2586 sigaddset(&mask, SIGALRM); 2587 sigaddset(&mask, SIGHUP); 2588 sigprocmask(SIG_BLOCK, &mask, &omask); 2589 switch ((pid = fork())) { 2590 case -1: 2591 sigprocmask(SIG_SETMASK, &omask, 0); 2592 close(nulldesc); 2593 return (-1); 2594 2595 case 0: 2596 argv[0] = strdup("sh"); 2597 argv[1] = strdup("-c"); 2598 argv[2] = strdup(prog); 2599 argv[3] = NULL; 2600 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2601 logerror("strdup"); 2602 exit(1); 2603 } 2604 2605 alarm(0); 2606 (void)setsid(); /* Avoid catching SIGHUPs. */ 2607 2608 /* 2609 * Throw away pending signals, and reset signal 2610 * behaviour to standard values. 2611 */ 2612 signal(SIGALRM, SIG_IGN); 2613 signal(SIGHUP, SIG_IGN); 2614 sigprocmask(SIG_SETMASK, &omask, 0); 2615 signal(SIGPIPE, SIG_DFL); 2616 signal(SIGQUIT, SIG_DFL); 2617 signal(SIGALRM, SIG_DFL); 2618 signal(SIGHUP, SIG_DFL); 2619 2620 dup2(pfd[0], STDIN_FILENO); 2621 dup2(nulldesc, STDOUT_FILENO); 2622 dup2(nulldesc, STDERR_FILENO); 2623 closefrom(3); 2624 2625 (void)execvp(_PATH_BSHELL, argv); 2626 _exit(255); 2627 } 2628 2629 sigprocmask(SIG_SETMASK, &omask, 0); 2630 close(nulldesc); 2631 close(pfd[0]); 2632 /* 2633 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2634 * supposed to get an EWOULDBLOCK on writev(2), which is 2635 * caught by the logic above anyway, which will in turn close 2636 * the pipe, and fork a new logging subprocess if necessary. 2637 * The stale subprocess will be killed some time later unless 2638 * it terminated itself due to closing its input pipe (so we 2639 * get rid of really dead puppies). 2640 */ 2641 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2642 /* This is bad. */ 2643 (void)snprintf(errmsg, sizeof errmsg, 2644 "Warning: cannot change pipe to PID %d to " 2645 "non-blocking behaviour.", 2646 (int)pid); 2647 logerror(errmsg); 2648 } 2649 *rpid = pid; 2650 return (pfd[1]); 2651 } 2652 2653 static void 2654 deadq_enter(pid_t pid, const char *name) 2655 { 2656 dq_t p; 2657 int status; 2658 2659 /* 2660 * Be paranoid, if we can't signal the process, don't enter it 2661 * into the dead queue (perhaps it's already dead). If possible, 2662 * we try to fetch and log the child's status. 2663 */ 2664 if (kill(pid, 0) != 0) { 2665 if (waitpid(pid, &status, WNOHANG) > 0) 2666 log_deadchild(pid, status, name); 2667 return; 2668 } 2669 2670 p = malloc(sizeof(struct deadq_entry)); 2671 if (p == NULL) { 2672 logerror("malloc"); 2673 exit(1); 2674 } 2675 2676 p->dq_pid = pid; 2677 p->dq_timeout = DQ_TIMO_INIT; 2678 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2679 } 2680 2681 static int 2682 deadq_remove(pid_t pid) 2683 { 2684 dq_t q; 2685 2686 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2687 if (q->dq_pid == pid) { 2688 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2689 free(q); 2690 return (1); 2691 } 2692 } 2693 2694 return (0); 2695 } 2696 2697 static void 2698 log_deadchild(pid_t pid, int status, const char *name) 2699 { 2700 int code; 2701 char buf[256]; 2702 const char *reason; 2703 2704 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2705 if (WIFSIGNALED(status)) { 2706 reason = "due to signal"; 2707 code = WTERMSIG(status); 2708 } else { 2709 reason = "with status"; 2710 code = WEXITSTATUS(status); 2711 if (code == 0) 2712 return; 2713 } 2714 (void)snprintf(buf, sizeof buf, 2715 "Logging subprocess %d (%s) exited %s %d.", 2716 pid, name, reason, code); 2717 logerror(buf); 2718 } 2719 2720 static int * 2721 socksetup(int af, char *bindhostname) 2722 { 2723 struct addrinfo hints, *res, *r; 2724 const char *bindservice; 2725 char *cp; 2726 int error, maxs, *s, *socks; 2727 2728 /* 2729 * We have to handle this case for backwards compatibility: 2730 * If there are two (or more) colons but no '[' and ']', 2731 * assume this is an inet6 address without a service. 2732 */ 2733 bindservice = "syslog"; 2734 if (bindhostname != NULL) { 2735 #ifdef INET6 2736 if (*bindhostname == '[' && 2737 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2738 ++bindhostname; 2739 *cp = '\0'; 2740 if (cp[1] == ':' && cp[2] != '\0') 2741 bindservice = cp + 2; 2742 } else { 2743 #endif 2744 cp = strchr(bindhostname, ':'); 2745 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2746 *cp = '\0'; 2747 if (cp[1] != '\0') 2748 bindservice = cp + 1; 2749 if (cp == bindhostname) 2750 bindhostname = NULL; 2751 } 2752 #ifdef INET6 2753 } 2754 #endif 2755 } 2756 2757 memset(&hints, 0, sizeof(hints)); 2758 hints.ai_flags = AI_PASSIVE; 2759 hints.ai_family = af; 2760 hints.ai_socktype = SOCK_DGRAM; 2761 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2762 if (error) { 2763 logerror(gai_strerror(error)); 2764 errno = 0; 2765 die(0); 2766 } 2767 2768 /* Count max number of sockets we may open */ 2769 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2770 socks = malloc((maxs+1) * sizeof(int)); 2771 if (socks == NULL) { 2772 logerror("couldn't allocate memory for sockets"); 2773 die(0); 2774 } 2775 2776 *socks = 0; /* num of sockets counter at start of array */ 2777 s = socks + 1; 2778 for (r = res; r; r = r->ai_next) { 2779 int on = 1; 2780 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2781 if (*s < 0) { 2782 logerror("socket"); 2783 continue; 2784 } 2785 #ifdef INET6 2786 if (r->ai_family == AF_INET6) { 2787 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2788 (char *)&on, sizeof (on)) < 0) { 2789 logerror("setsockopt"); 2790 close(*s); 2791 continue; 2792 } 2793 } 2794 #endif 2795 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2796 (char *)&on, sizeof (on)) < 0) { 2797 logerror("setsockopt"); 2798 close(*s); 2799 continue; 2800 } 2801 /* 2802 * RFC 3164 recommends that client side message 2803 * should come from the privileged syslogd port. 2804 * 2805 * If the system administrator choose not to obey 2806 * this, we can skip the bind() step so that the 2807 * system will choose a port for us. 2808 */ 2809 if (!NoBind) { 2810 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2811 logerror("bind"); 2812 close(*s); 2813 continue; 2814 } 2815 2816 if (!SecureMode) 2817 increase_rcvbuf(*s); 2818 } 2819 2820 (*socks)++; 2821 dprintf("socksetup: new socket fd is %d\n", *s); 2822 s++; 2823 } 2824 2825 if (*socks == 0) { 2826 free(socks); 2827 if (Debug) 2828 return (NULL); 2829 else 2830 die(0); 2831 } 2832 if (res) 2833 freeaddrinfo(res); 2834 2835 return (socks); 2836 } 2837 2838 static void 2839 increase_rcvbuf(int fd) 2840 { 2841 socklen_t len, slen; 2842 2843 slen = sizeof(len); 2844 2845 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2846 if (len < RCVBUF_MINSIZE) { 2847 len = RCVBUF_MINSIZE; 2848 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2849 } 2850 } 2851 } 2852