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