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 * 3. 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 /* Maximum number of characters in time of last occurrence */ 72 #define MAXDATELEN 16 73 #define MAXLINE 1024 /* maximum line length */ 74 #define MAXSVLINE MAXLINE /* maximum saved line length */ 75 #define DEFUPRI (LOG_USER|LOG_NOTICE) 76 #define DEFSPRI (LOG_KERN|LOG_CRIT) 77 #define TIMERINTVL 30 /* interval for checking flush, mark */ 78 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 79 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 80 81 #include <sys/param.h> 82 #include <sys/ioctl.h> 83 #include <sys/mman.h> 84 #include <sys/queue.h> 85 #include <sys/resource.h> 86 #include <sys/socket.h> 87 #include <sys/stat.h> 88 #include <sys/syslimits.h> 89 #include <sys/time.h> 90 #include <sys/uio.h> 91 #include <sys/un.h> 92 #include <sys/wait.h> 93 94 #if defined(INET) || defined(INET6) 95 #include <netinet/in.h> 96 #include <arpa/inet.h> 97 #endif 98 #include <netdb.h> 99 100 #include <ctype.h> 101 #include <dirent.h> 102 #include <err.h> 103 #include <errno.h> 104 #include <fcntl.h> 105 #include <fnmatch.h> 106 #include <libutil.h> 107 #include <limits.h> 108 #include <paths.h> 109 #include <signal.h> 110 #include <stdio.h> 111 #include <stdlib.h> 112 #include <string.h> 113 #include <sysexits.h> 114 #include <unistd.h> 115 #include <utmpx.h> 116 117 #include "pathnames.h" 118 #include "ttymsg.h" 119 120 #define SYSLOG_NAMES 121 #include <sys/syslog.h> 122 123 static const char *ConfFile = _PATH_LOGCONF; 124 static const char *PidFile = _PATH_LOGPID; 125 static const char ctty[] = _PATH_CONSOLE; 126 static const char include_str[] = "include"; 127 static const char include_ext[] = ".conf"; 128 129 #define dprintf if (Debug) printf 130 131 #define MAXUNAMES 20 /* maximum number of user names */ 132 133 #define sstosa(ss) ((struct sockaddr *)(ss)) 134 #ifdef INET 135 #define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) 136 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 137 #endif 138 #ifdef INET6 139 #define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) 140 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 141 #define s6_addr32 __u6_addr.__u6_addr32 142 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 143 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 144 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 145 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 146 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 147 #endif 148 /* 149 * List of peers and sockets for binding. 150 */ 151 struct peer { 152 const char *pe_name; 153 const char *pe_serv; 154 mode_t pe_mode; 155 STAILQ_ENTRY(peer) next; 156 }; 157 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 158 159 struct socklist { 160 struct sockaddr_storage sl_ss; 161 int sl_socket; 162 struct peer *sl_peer; 163 int (*sl_recv)(struct socklist *); 164 STAILQ_ENTRY(socklist) next; 165 }; 166 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 167 168 /* 169 * Flags to logmsg(). 170 */ 171 172 #define IGN_CONS 0x001 /* don't print on console */ 173 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 174 #define ADDDATE 0x004 /* add a date to the message */ 175 #define MARK 0x008 /* this message is a mark */ 176 #define ISKERNEL 0x010 /* kernel generated message */ 177 178 /* 179 * This structure represents the files that will have log 180 * copies printed. 181 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 182 * or if f_type if F_PIPE and f_pid > 0. 183 */ 184 185 struct filed { 186 STAILQ_ENTRY(filed) next; /* next in linked list */ 187 short f_type; /* entry type, see below */ 188 short f_file; /* file descriptor */ 189 time_t f_time; /* time this was last written */ 190 char *f_host; /* host from which to recd. */ 191 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 192 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 193 #define PRI_LT 0x1 194 #define PRI_EQ 0x2 195 #define PRI_GT 0x4 196 char *f_program; /* program this applies to */ 197 union { 198 char f_uname[MAXUNAMES][MAXLOGNAME]; 199 struct { 200 char f_hname[MAXHOSTNAMELEN]; 201 struct addrinfo *f_addr; 202 203 } f_forw; /* forwarding address */ 204 char f_fname[MAXPATHLEN]; 205 struct { 206 char f_pname[MAXPATHLEN]; 207 pid_t f_pid; 208 } f_pipe; 209 } f_un; 210 #define fu_uname f_un.f_uname 211 #define fu_forw_hname f_un.f_forw.f_hname 212 #define fu_forw_addr f_un.f_forw.f_addr 213 #define fu_fname f_un.f_fname 214 #define fu_pipe_pname f_un.f_pipe.f_pname 215 #define fu_pipe_pid f_un.f_pipe.f_pid 216 char f_prevline[MAXSVLINE]; /* last message logged */ 217 char f_lasttime[MAXDATELEN]; /* time of last occurrence */ 218 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 219 int f_prevpri; /* pri of f_prevline */ 220 int f_prevlen; /* length of f_prevline */ 221 int f_prevcount; /* repetition cnt of prevline */ 222 u_int f_repeatcount; /* number of "repeated" msgs */ 223 int f_flags; /* file-specific flags */ 224 #define FFLAG_SYNC 0x01 225 #define FFLAG_NEEDSYNC 0x02 226 }; 227 228 /* 229 * Queue of about-to-be dead processes we should watch out for. 230 */ 231 struct deadq_entry { 232 pid_t dq_pid; 233 int dq_timeout; 234 TAILQ_ENTRY(deadq_entry) dq_entries; 235 }; 236 static TAILQ_HEAD(, deadq_entry) deadq_head = 237 TAILQ_HEAD_INITIALIZER(deadq_head); 238 239 /* 240 * The timeout to apply to processes waiting on the dead queue. Unit 241 * of measure is `mark intervals', i.e. 20 minutes by default. 242 * Processes on the dead queue will be terminated after that time. 243 */ 244 245 #define DQ_TIMO_INIT 2 246 247 /* 248 * Struct to hold records of network addresses that are allowed to log 249 * to us. 250 */ 251 struct allowedpeer { 252 int isnumeric; 253 u_short port; 254 union { 255 struct { 256 struct sockaddr_storage addr; 257 struct sockaddr_storage mask; 258 } numeric; 259 char *name; 260 } u; 261 #define a_addr u.numeric.addr 262 #define a_mask u.numeric.mask 263 #define a_name u.name 264 STAILQ_ENTRY(allowedpeer) next; 265 }; 266 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 267 268 269 /* 270 * Intervals at which we flush out "message repeated" messages, 271 * in seconds after previous message is logged. After each flush, 272 * we move to the next interval until we reach the largest. 273 */ 274 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 275 #define MAXREPEAT (nitems(repeatinterval) - 1) 276 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 277 #define BACKOFF(f) do { \ 278 if (++(f)->f_repeatcount > MAXREPEAT) \ 279 (f)->f_repeatcount = MAXREPEAT; \ 280 } while (0) 281 282 /* values for f_type */ 283 #define F_UNUSED 0 /* unused entry */ 284 #define F_FILE 1 /* regular file */ 285 #define F_TTY 2 /* terminal */ 286 #define F_CONSOLE 3 /* console terminal */ 287 #define F_FORW 4 /* remote machine */ 288 #define F_USERS 5 /* list of users */ 289 #define F_WALL 6 /* everyone logged on */ 290 #define F_PIPE 7 /* pipe to program */ 291 292 static const char *TypeNames[] = { 293 "UNUSED", "FILE", "TTY", "CONSOLE", 294 "FORW", "USERS", "WALL", "PIPE" 295 }; 296 297 static STAILQ_HEAD(, filed) fhead = 298 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 299 static struct filed consfile; /* Console */ 300 301 static int Debug; /* debug flag */ 302 static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 303 static int resolve = 1; /* resolve hostname */ 304 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 305 static const char *LocalDomain; /* our local domain name */ 306 static int Initialized; /* set when we have initialized ourselves */ 307 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 308 static int MarkSeq; /* mark sequence number */ 309 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 310 static int SecureMode; /* when true, receive only unix domain socks */ 311 #ifdef INET6 312 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 313 #else 314 static int family = PF_INET; /* protocol family (IPv4 only) */ 315 #endif 316 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 317 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 318 static int use_bootfile; /* log entire bootfile for every kern msg */ 319 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 320 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 321 322 static char bootfile[MAXLINE+1]; /* booted kernel file */ 323 324 static int RemoteAddDate; /* Always set the date on remote messages */ 325 326 static int UniquePriority; /* Only log specified priority? */ 327 static int LogFacPri; /* Put facility and priority in log message: */ 328 /* 0=no, 1=numeric, 2=names */ 329 static int KeepKernFac; /* Keep remotely logged kernel facility */ 330 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 331 static struct pidfh *pfh; 332 static int sigpipe[2]; /* Pipe to catch a signal during select(). */ 333 334 static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild; 335 336 static int allowaddr(char *); 337 static int addfile(struct filed *); 338 static int addpeer(struct peer *); 339 static int addsock(struct sockaddr *, socklen_t, struct socklist *); 340 static struct filed *cfline(const char *, const char *, const char *); 341 static const char *cvthname(struct sockaddr *); 342 static void deadq_enter(pid_t, const char *); 343 static int deadq_remove(struct deadq_entry *); 344 static int deadq_removebypid(pid_t); 345 static int decode(const char *, const CODE *); 346 static void die(int) __dead2; 347 static void dodie(int); 348 static void dofsync(void); 349 static void domark(int); 350 static void fprintlog(struct filed *, int, const char *); 351 static void init(int); 352 static void logerror(const char *); 353 static void logmsg(int, const char *, const char *, int); 354 static void log_deadchild(pid_t, int, const char *); 355 static void markit(void); 356 static int socksetup(struct peer *); 357 static int socklist_recv_file(struct socklist *); 358 static int socklist_recv_sock(struct socklist *); 359 static int socklist_recv_signal(struct socklist *); 360 static void sighandler(int); 361 static int skip_message(const char *, const char *, int); 362 static void printline(const char *, char *, int); 363 static void printsys(char *); 364 static int p_open(const char *, pid_t *); 365 static void reapchild(int); 366 static const char *ttymsg_check(struct iovec *, int, char *, int); 367 static void usage(void); 368 static int validate(struct sockaddr *, const char *); 369 static void unmapped(struct sockaddr *); 370 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 371 static int waitdaemon(int); 372 static void timedout(int); 373 static void increase_rcvbuf(int); 374 375 static void 376 close_filed(struct filed *f) 377 { 378 379 if (f == NULL || f->f_file == -1) 380 return; 381 382 switch (f->f_type) { 383 case F_FILE: 384 case F_TTY: 385 case F_CONSOLE: 386 case F_FORW: 387 f->f_type = F_UNUSED; 388 break; 389 case F_PIPE: 390 f->fu_pipe_pid = 0; 391 break; 392 } 393 (void)close(f->f_file); 394 f->f_file = -1; 395 } 396 397 static int 398 addfile(struct filed *f0) 399 { 400 struct filed *f; 401 402 f = calloc(1, sizeof(*f)); 403 if (f == NULL) 404 err(1, "malloc failed"); 405 *f = *f0; 406 STAILQ_INSERT_TAIL(&fhead, f, next); 407 408 return (0); 409 } 410 411 static int 412 addpeer(struct peer *pe0) 413 { 414 struct peer *pe; 415 416 pe = calloc(1, sizeof(*pe)); 417 if (pe == NULL) 418 err(1, "malloc failed"); 419 *pe = *pe0; 420 STAILQ_INSERT_TAIL(&pqueue, pe, next); 421 422 return (0); 423 } 424 425 static int 426 addsock(struct sockaddr *sa, socklen_t sa_len, struct socklist *sl0) 427 { 428 struct socklist *sl; 429 430 sl = calloc(1, sizeof(*sl)); 431 if (sl == NULL) 432 err(1, "malloc failed"); 433 *sl = *sl0; 434 if (sa != NULL && sa_len > 0) 435 memcpy(&sl->sl_ss, sa, sa_len); 436 STAILQ_INSERT_TAIL(&shead, sl, next); 437 438 return (0); 439 } 440 441 int 442 main(int argc, char *argv[]) 443 { 444 int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0; 445 fd_set *fdsr = NULL; 446 struct timeval tv, *tvp; 447 struct peer *pe; 448 struct socklist *sl; 449 pid_t ppid = 1, spid; 450 char *p; 451 452 if (madvise(NULL, 0, MADV_PROTECT) != 0) 453 dprintf("madvise() failed: %s\n", strerror(errno)); 454 455 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 456 != -1) 457 switch (ch) { 458 #ifdef INET 459 case '4': 460 family = PF_INET; 461 break; 462 #endif 463 #ifdef INET6 464 case '6': 465 family = PF_INET6; 466 break; 467 #endif 468 case '8': 469 mask_C1 = 0; 470 break; 471 case 'A': 472 send_to_all++; 473 break; 474 case 'a': /* allow specific network addresses only */ 475 if (allowaddr(optarg) == -1) 476 usage(); 477 break; 478 case 'b': 479 bflag = 1; 480 p = strchr(optarg, ']'); 481 if (p != NULL) 482 p = strchr(p + 1, ':'); 483 else { 484 p = strchr(optarg, ':'); 485 if (p != NULL && strchr(p + 1, ':') != NULL) 486 p = NULL; /* backward compatibility */ 487 } 488 if (p == NULL) { 489 /* A hostname or filename only. */ 490 addpeer(&(struct peer){ 491 .pe_name = optarg, 492 .pe_serv = "syslog" 493 }); 494 } else { 495 /* The case of "name:service". */ 496 *p++ = '\0'; 497 addpeer(&(struct peer){ 498 .pe_serv = p, 499 .pe_name = (strlen(optarg) == 0) ? 500 NULL : optarg, 501 }); 502 } 503 break; 504 case 'c': 505 no_compress++; 506 break; 507 case 'C': 508 logflags |= O_CREAT; 509 break; 510 case 'd': /* debug */ 511 Debug++; 512 break; 513 case 'f': /* configuration file */ 514 ConfFile = optarg; 515 break; 516 case 'F': /* run in foreground instead of daemon */ 517 Foreground++; 518 break; 519 case 'k': /* keep remote kern fac */ 520 KeepKernFac = 1; 521 break; 522 case 'l': 523 case 'p': 524 case 'S': 525 { 526 long perml; 527 mode_t mode; 528 char *name, *ep; 529 530 if (ch == 'l') 531 mode = DEFFILEMODE; 532 else if (ch == 'p') { 533 mode = DEFFILEMODE; 534 pflag = 1; 535 } else if (ch == 'S') { 536 mode = S_IRUSR | S_IWUSR; 537 Sflag = 1; 538 } 539 if (optarg[0] == '/') 540 name = optarg; 541 else if ((name = strchr(optarg, ':')) != NULL) { 542 *name++ = '\0'; 543 if (name[0] != '/') 544 errx(1, "socket name must be absolute " 545 "path"); 546 if (isdigit(*optarg)) { 547 perml = strtol(optarg, &ep, 8); 548 if (*ep || perml < 0 || 549 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 550 errx(1, "invalid mode %s, exiting", 551 optarg); 552 mode = (mode_t )perml; 553 } else 554 errx(1, "invalid mode %s, exiting", 555 optarg); 556 } else 557 errx(1, "invalid filename %s, exiting", 558 optarg); 559 addpeer(&(struct peer){ 560 .pe_name = name, 561 .pe_mode = mode 562 }); 563 break; 564 } 565 case 'm': /* mark interval */ 566 MarkInterval = atoi(optarg) * 60; 567 break; 568 case 'N': 569 NoBind = 1; 570 SecureMode = 1; 571 break; 572 case 'n': 573 resolve = 0; 574 break; 575 case 'o': 576 use_bootfile = 1; 577 break; 578 case 'P': /* path for alt. PID */ 579 PidFile = optarg; 580 break; 581 case 's': /* no network mode */ 582 SecureMode++; 583 break; 584 case 'T': 585 RemoteAddDate = 1; 586 break; 587 case 'u': /* only log specified priority */ 588 UniquePriority++; 589 break; 590 case 'v': /* log facility and priority */ 591 LogFacPri++; 592 break; 593 default: 594 usage(); 595 } 596 if ((argc -= optind) != 0) 597 usage(); 598 599 /* Pipe to catch a signal during select(). */ 600 s = pipe2(sigpipe, O_CLOEXEC); 601 if (s < 0) { 602 err(1, "cannot open a pipe for signals"); 603 } else { 604 addsock(NULL, 0, &(struct socklist){ 605 .sl_socket = sigpipe[0], 606 .sl_recv = socklist_recv_signal 607 }); 608 } 609 610 /* Listen by default: /dev/klog. */ 611 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 612 if (s < 0) { 613 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 614 } else { 615 addsock(NULL, 0, &(struct socklist){ 616 .sl_socket = s, 617 .sl_recv = socklist_recv_file, 618 }); 619 } 620 /* Listen by default: *:514 if no -b flag. */ 621 if (bflag == 0) 622 addpeer(&(struct peer){ 623 .pe_serv = "syslog" 624 }); 625 /* Listen by default: /var/run/log if no -p flag. */ 626 if (pflag == 0) 627 addpeer(&(struct peer){ 628 .pe_name = _PATH_LOG, 629 .pe_mode = DEFFILEMODE, 630 }); 631 /* Listen by default: /var/run/logpriv if no -S flag. */ 632 if (Sflag == 0) 633 addpeer(&(struct peer){ 634 .pe_name = _PATH_LOG_PRIV, 635 .pe_mode = S_IRUSR | S_IWUSR, 636 }); 637 STAILQ_FOREACH(pe, &pqueue, next) 638 socksetup(pe); 639 640 pfh = pidfile_open(PidFile, 0600, &spid); 641 if (pfh == NULL) { 642 if (errno == EEXIST) 643 errx(1, "syslogd already running, pid: %d", spid); 644 warn("cannot open pid file"); 645 } 646 647 if ((!Foreground) && (!Debug)) { 648 ppid = waitdaemon(30); 649 if (ppid < 0) { 650 warn("could not become daemon"); 651 pidfile_remove(pfh); 652 exit(1); 653 } 654 } else if (Debug) 655 setlinebuf(stdout); 656 657 consfile.f_type = F_CONSOLE; 658 (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1, 659 sizeof(consfile.fu_fname)); 660 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 661 (void)signal(SIGTERM, dodie); 662 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 663 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 664 (void)signal(SIGHUP, sighandler); 665 (void)signal(SIGCHLD, sighandler); 666 (void)signal(SIGALRM, domark); 667 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 668 (void)alarm(TIMERINTVL); 669 670 /* tuck my process id away */ 671 pidfile_write(pfh); 672 673 dprintf("off & running....\n"); 674 675 tvp = &tv; 676 tv.tv_sec = tv.tv_usec = 0; 677 678 STAILQ_FOREACH(sl, &shead, next) { 679 if (sl->sl_socket > fdsrmax) 680 fdsrmax = sl->sl_socket; 681 } 682 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 683 sizeof(fd_mask)); 684 if (fdsr == NULL) 685 errx(1, "calloc fd_set"); 686 687 for (;;) { 688 if (Initialized == 0) 689 init(0); 690 else if (WantInitialize) 691 init(WantInitialize); 692 if (WantReapchild) 693 reapchild(WantReapchild); 694 if (MarkSet) 695 markit(); 696 if (WantDie) { 697 free(fdsr); 698 die(WantDie); 699 } 700 701 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 702 sizeof(fd_mask)); 703 704 STAILQ_FOREACH(sl, &shead, next) { 705 if (sl->sl_socket != -1 && sl->sl_recv != NULL) 706 FD_SET(sl->sl_socket, fdsr); 707 } 708 i = select(fdsrmax + 1, fdsr, NULL, NULL, 709 needdofsync ? &tv : tvp); 710 switch (i) { 711 case 0: 712 dofsync(); 713 needdofsync = 0; 714 if (tvp) { 715 tvp = NULL; 716 if (ppid != 1) 717 kill(ppid, SIGALRM); 718 } 719 continue; 720 case -1: 721 if (errno != EINTR) 722 logerror("select"); 723 continue; 724 } 725 STAILQ_FOREACH(sl, &shead, next) { 726 if (FD_ISSET(sl->sl_socket, fdsr)) 727 (*sl->sl_recv)(sl); 728 } 729 } 730 free(fdsr); 731 } 732 733 static int 734 socklist_recv_signal(struct socklist *sl __unused) 735 { 736 ssize_t len; 737 int i, nsig, signo; 738 739 if (ioctl(sigpipe[0], FIONREAD, &i) != 0) { 740 logerror("ioctl(FIONREAD)"); 741 err(1, "signal pipe read failed"); 742 } 743 nsig = i / sizeof(signo); 744 dprintf("# of received signals = %d\n", nsig); 745 for (i = 0; i < nsig; i++) { 746 len = read(sigpipe[0], &signo, sizeof(signo)); 747 if (len != sizeof(signo)) { 748 logerror("signal pipe read failed"); 749 err(1, "signal pipe read failed"); 750 } 751 dprintf("Received signal: %d from fd=%d\n", signo, 752 sigpipe[0]); 753 switch (signo) { 754 case SIGHUP: 755 WantInitialize = 1; 756 break; 757 case SIGCHLD: 758 WantReapchild = 1; 759 break; 760 } 761 } 762 return (0); 763 } 764 765 static int 766 socklist_recv_sock(struct socklist *sl) 767 { 768 struct sockaddr_storage ss; 769 struct sockaddr *sa = (struct sockaddr *)&ss; 770 socklen_t sslen; 771 const char *hname; 772 char line[MAXLINE + 1]; 773 int date, len; 774 775 sslen = sizeof(ss); 776 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 777 dprintf("received sa_len = %d\n", sslen); 778 if (len == 0) 779 return (-1); 780 if (len < 0) { 781 if (errno != EINTR) 782 logerror("recvfrom"); 783 return (-1); 784 } 785 /* Received valid data. */ 786 line[len] = '\0'; 787 if (sl->sl_ss.ss_family == AF_LOCAL) { 788 hname = LocalHostName; 789 date = 0; 790 } else { 791 hname = cvthname(sa); 792 unmapped(sa); 793 if (validate(sa, hname) == 0) 794 hname = NULL; 795 date = RemoteAddDate ? ADDDATE : 0; 796 } 797 if (hname != NULL) 798 printline(hname, line, date); 799 else 800 dprintf("Invalid msg from %s was ignored.", hname); 801 802 return (0); 803 } 804 805 static void 806 unmapped(struct sockaddr *sa) 807 { 808 #if defined(INET) && defined(INET6) 809 struct sockaddr_in6 *sin6; 810 struct sockaddr_in sin; 811 812 if (sa == NULL || 813 sa->sa_family != AF_INET6 || 814 sa->sa_len != sizeof(*sin6)) 815 return; 816 sin6 = satosin6(sa); 817 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 818 return; 819 sin = (struct sockaddr_in){ 820 .sin_family = AF_INET, 821 .sin_len = sizeof(sin), 822 .sin_port = sin6->sin6_port 823 }; 824 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 825 sizeof(sin.sin_addr)); 826 memcpy(sa, &sin, sizeof(sin)); 827 #else 828 if (sa == NULL) 829 return; 830 #endif 831 } 832 833 static void 834 usage(void) 835 { 836 837 fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n", 838 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 839 " [-b bind_address] [-f config_file]", 840 " [-l [mode:]path] [-m mark_interval]", 841 " [-P pid_file] [-p log_socket]", 842 " [-S logpriv_socket]"); 843 exit(1); 844 } 845 846 /* 847 * Take a raw input line, decode the message, and print the message 848 * on the appropriate log files. 849 */ 850 static void 851 printline(const char *hname, char *msg, int flags) 852 { 853 char *p, *q; 854 long n; 855 int c, pri; 856 char line[MAXLINE + 1]; 857 858 /* test for special codes */ 859 p = msg; 860 pri = DEFUPRI; 861 if (*p == '<') { 862 errno = 0; 863 n = strtol(p + 1, &q, 10); 864 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 865 p = q + 1; 866 pri = n; 867 } 868 } 869 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 870 pri = DEFUPRI; 871 872 /* 873 * Don't allow users to log kernel messages. 874 * NOTE: since LOG_KERN == 0 this will also match 875 * messages with no facility specified. 876 */ 877 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 878 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 879 880 q = line; 881 882 while ((c = (unsigned char)*p++) != '\0' && 883 q < &line[sizeof(line) - 4]) { 884 if (mask_C1 && (c & 0x80) && c < 0xA0) { 885 c &= 0x7F; 886 *q++ = 'M'; 887 *q++ = '-'; 888 } 889 if (isascii(c) && iscntrl(c)) { 890 if (c == '\n') { 891 *q++ = ' '; 892 } else if (c == '\t') { 893 *q++ = '\t'; 894 } else { 895 *q++ = '^'; 896 *q++ = c ^ 0100; 897 } 898 } else { 899 *q++ = c; 900 } 901 } 902 *q = '\0'; 903 904 logmsg(pri, line, hname, flags); 905 } 906 907 /* 908 * Read /dev/klog while data are available, split into lines. 909 */ 910 static int 911 socklist_recv_file(struct socklist *sl) 912 { 913 char *p, *q, line[MAXLINE + 1]; 914 int len, i; 915 916 len = 0; 917 for (;;) { 918 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 919 if (i > 0) { 920 line[i + len] = '\0'; 921 } else { 922 if (i < 0 && errno != EINTR && errno != EAGAIN) { 923 logerror("klog"); 924 close(sl->sl_socket); 925 sl->sl_socket = -1; 926 } 927 break; 928 } 929 930 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 931 *q = '\0'; 932 printsys(p); 933 } 934 len = strlen(p); 935 if (len >= MAXLINE - 1) { 936 printsys(p); 937 len = 0; 938 } 939 if (len > 0) 940 memmove(line, p, len + 1); 941 } 942 if (len > 0) 943 printsys(line); 944 945 return (len); 946 } 947 948 /* 949 * Take a raw input line from /dev/klog, format similar to syslog(). 950 */ 951 static void 952 printsys(char *msg) 953 { 954 char *p, *q; 955 long n; 956 int flags, isprintf, pri; 957 958 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 959 p = msg; 960 pri = DEFSPRI; 961 isprintf = 1; 962 if (*p == '<') { 963 errno = 0; 964 n = strtol(p + 1, &q, 10); 965 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 966 p = q + 1; 967 pri = n; 968 isprintf = 0; 969 } 970 } 971 /* 972 * Kernel printf's and LOG_CONSOLE messages have been displayed 973 * on the console already. 974 */ 975 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 976 flags |= IGN_CONS; 977 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 978 pri = DEFSPRI; 979 logmsg(pri, p, LocalHostName, flags); 980 } 981 982 static time_t now; 983 984 /* 985 * Match a program or host name against a specification. 986 * Return a non-0 value if the message must be ignored 987 * based on the specification. 988 */ 989 static int 990 skip_message(const char *name, const char *spec, int checkcase) 991 { 992 const char *s; 993 char prev, next; 994 int exclude = 0; 995 /* Behaviour on explicit match */ 996 997 if (spec == NULL) 998 return 0; 999 switch (*spec) { 1000 case '-': 1001 exclude = 1; 1002 /*FALLTHROUGH*/ 1003 case '+': 1004 spec++; 1005 break; 1006 default: 1007 break; 1008 } 1009 if (checkcase) 1010 s = strstr (spec, name); 1011 else 1012 s = strcasestr (spec, name); 1013 1014 if (s != NULL) { 1015 prev = (s == spec ? ',' : *(s - 1)); 1016 next = *(s + strlen (name)); 1017 1018 if (prev == ',' && (next == '\0' || next == ',')) 1019 /* Explicit match: skip iff the spec is an 1020 exclusive one. */ 1021 return exclude; 1022 } 1023 1024 /* No explicit match for this name: skip the message iff 1025 the spec is an inclusive one. */ 1026 return !exclude; 1027 } 1028 1029 /* 1030 * Log a message to the appropriate log files, users, etc. based on 1031 * the priority. 1032 */ 1033 static void 1034 logmsg(int pri, const char *msg, const char *from, int flags) 1035 { 1036 struct filed *f; 1037 int i, fac, msglen, prilev; 1038 const char *timestamp; 1039 char prog[NAME_MAX+1]; 1040 char buf[MAXLINE+1]; 1041 1042 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1043 pri, flags, from, msg); 1044 1045 /* 1046 * Check to see if msg looks non-standard. 1047 */ 1048 msglen = strlen(msg); 1049 if (msglen < MAXDATELEN || msg[3] != ' ' || msg[6] != ' ' || 1050 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 1051 flags |= ADDDATE; 1052 1053 (void)time(&now); 1054 if (flags & ADDDATE) { 1055 timestamp = ctime(&now) + 4; 1056 } else { 1057 timestamp = msg; 1058 msg += MAXDATELEN; 1059 msglen -= MAXDATELEN; 1060 } 1061 1062 /* skip leading blanks */ 1063 while (isspace(*msg)) { 1064 msg++; 1065 msglen--; 1066 } 1067 1068 /* extract facility and priority level */ 1069 if (flags & MARK) 1070 fac = LOG_NFACILITIES; 1071 else 1072 fac = LOG_FAC(pri); 1073 1074 /* Check maximum facility number. */ 1075 if (fac > LOG_NFACILITIES) 1076 return; 1077 1078 prilev = LOG_PRI(pri); 1079 1080 /* extract program name */ 1081 for (i = 0; i < NAME_MAX; i++) { 1082 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 1083 msg[i] == '/' || isspace(msg[i])) 1084 break; 1085 prog[i] = msg[i]; 1086 } 1087 prog[i] = 0; 1088 1089 /* add kernel prefix for kernel messages */ 1090 if (flags & ISKERNEL) { 1091 snprintf(buf, sizeof(buf), "%s: %s", 1092 use_bootfile ? bootfile : "kernel", msg); 1093 msg = buf; 1094 msglen = strlen(buf); 1095 } 1096 1097 /* log the message to the particular outputs */ 1098 if (!Initialized) { 1099 f = &consfile; 1100 /* 1101 * Open in non-blocking mode to avoid hangs during open 1102 * and close(waiting for the port to drain). 1103 */ 1104 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1105 1106 if (f->f_file >= 0) { 1107 (void)strlcpy(f->f_lasttime, timestamp, 1108 sizeof(f->f_lasttime)); 1109 fprintlog(f, flags, msg); 1110 close(f->f_file); 1111 f->f_file = -1; 1112 } 1113 return; 1114 } 1115 STAILQ_FOREACH(f, &fhead, next) { 1116 /* skip messages that are incorrect priority */ 1117 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1118 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1119 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1120 ) 1121 || f->f_pmask[fac] == INTERNAL_NOPRI) 1122 continue; 1123 1124 /* skip messages with the incorrect hostname */ 1125 if (skip_message(from, f->f_host, 0)) 1126 continue; 1127 1128 /* skip messages with the incorrect program name */ 1129 if (skip_message(prog, f->f_program, 1)) 1130 continue; 1131 1132 /* skip message to console if it has already been printed */ 1133 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1134 continue; 1135 1136 /* don't output marks to recently written files */ 1137 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1138 continue; 1139 1140 /* 1141 * suppress duplicate lines to this file 1142 */ 1143 if (no_compress - (f->f_type != F_PIPE) < 1 && 1144 (flags & MARK) == 0 && msglen == f->f_prevlen && 1145 !strcmp(msg, f->f_prevline) && 1146 !strcasecmp(from, f->f_prevhost)) { 1147 (void)strlcpy(f->f_lasttime, timestamp, 1148 sizeof(f->f_lasttime)); 1149 f->f_prevcount++; 1150 dprintf("msg repeated %d times, %ld sec of %d\n", 1151 f->f_prevcount, (long)(now - f->f_time), 1152 repeatinterval[f->f_repeatcount]); 1153 /* 1154 * If domark would have logged this by now, 1155 * flush it now (so we don't hold isolated messages), 1156 * but back off so we'll flush less often 1157 * in the future. 1158 */ 1159 if (now > REPEATTIME(f)) { 1160 fprintlog(f, flags, (char *)NULL); 1161 BACKOFF(f); 1162 } 1163 } else { 1164 /* new line, save it */ 1165 if (f->f_prevcount) 1166 fprintlog(f, 0, (char *)NULL); 1167 f->f_repeatcount = 0; 1168 f->f_prevpri = pri; 1169 (void)strlcpy(f->f_lasttime, timestamp, 1170 sizeof(f->f_lasttime)); 1171 (void)strlcpy(f->f_prevhost, from, 1172 sizeof(f->f_prevhost)); 1173 if (msglen < MAXSVLINE) { 1174 f->f_prevlen = msglen; 1175 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1176 fprintlog(f, flags, (char *)NULL); 1177 } else { 1178 f->f_prevline[0] = 0; 1179 f->f_prevlen = 0; 1180 fprintlog(f, flags, msg); 1181 } 1182 } 1183 } 1184 } 1185 1186 static void 1187 dofsync(void) 1188 { 1189 struct filed *f; 1190 1191 STAILQ_FOREACH(f, &fhead, next) { 1192 if ((f->f_type == F_FILE) && 1193 (f->f_flags & FFLAG_NEEDSYNC)) { 1194 f->f_flags &= ~FFLAG_NEEDSYNC; 1195 (void)fsync(f->f_file); 1196 } 1197 } 1198 } 1199 1200 #define IOV_SIZE 7 1201 static void 1202 fprintlog(struct filed *f, int flags, const char *msg) 1203 { 1204 struct iovec iov[IOV_SIZE]; 1205 struct addrinfo *r; 1206 int l, lsent = 0; 1207 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1208 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1209 const char *msgret; 1210 1211 if (f->f_type == F_WALL) { 1212 /* The time displayed is not synchornized with the other log 1213 * destinations (like messages). Following fragment was using 1214 * ctime(&now), which was updating the time every 30 sec. 1215 * With f_lasttime, time is synchronized correctly. 1216 */ 1217 iov[0] = (struct iovec){ 1218 .iov_base = greetings, 1219 .iov_len = snprintf(greetings, sizeof(greetings), 1220 "\r\n\7Message from syslogd@%s " 1221 "at %.24s ...\r\n", 1222 f->f_prevhost, f->f_lasttime) 1223 }; 1224 if (iov[0].iov_len >= sizeof(greetings)) 1225 iov[0].iov_len = sizeof(greetings) - 1; 1226 iov[1] = (struct iovec){ 1227 .iov_base = nul, 1228 .iov_len = 0 1229 }; 1230 } else { 1231 iov[0] = (struct iovec){ 1232 .iov_base = f->f_lasttime, 1233 .iov_len = strlen(f->f_lasttime) 1234 }; 1235 iov[1] = (struct iovec){ 1236 .iov_base = space, 1237 .iov_len = 1 1238 }; 1239 } 1240 1241 if (LogFacPri) { 1242 static char fp_buf[30]; /* Hollow laugh */ 1243 int fac = f->f_prevpri & LOG_FACMASK; 1244 int pri = LOG_PRI(f->f_prevpri); 1245 const char *f_s = NULL; 1246 char f_n[5]; /* Hollow laugh */ 1247 const char *p_s = NULL; 1248 char p_n[5]; /* Hollow laugh */ 1249 1250 if (LogFacPri > 1) { 1251 const CODE *c; 1252 1253 for (c = facilitynames; c->c_name; c++) { 1254 if (c->c_val == fac) { 1255 f_s = c->c_name; 1256 break; 1257 } 1258 } 1259 for (c = prioritynames; c->c_name; c++) { 1260 if (c->c_val == pri) { 1261 p_s = c->c_name; 1262 break; 1263 } 1264 } 1265 } 1266 if (!f_s) { 1267 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1268 f_s = f_n; 1269 } 1270 if (!p_s) { 1271 snprintf(p_n, sizeof p_n, "%d", pri); 1272 p_s = p_n; 1273 } 1274 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1275 iov[2] = (struct iovec){ 1276 .iov_base = fp_buf, 1277 .iov_len = strlen(fp_buf) 1278 }; 1279 } else { 1280 iov[2] = (struct iovec){ 1281 .iov_base = nul, 1282 .iov_len = 0 1283 }; 1284 } 1285 iov[3] = (struct iovec){ 1286 .iov_base = f->f_prevhost, 1287 .iov_len = strlen(f->f_prevhost) 1288 }; 1289 iov[4] = (struct iovec){ 1290 .iov_base = space, 1291 .iov_len = 1 1292 }; 1293 if (msg) { 1294 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1295 if (wmsg == NULL) { 1296 logerror("strdup"); 1297 exit(1); 1298 } 1299 iov[5] = (struct iovec){ 1300 .iov_base = wmsg, 1301 .iov_len = strlen(msg) 1302 }; 1303 } else if (f->f_prevcount > 1) { 1304 iov[5] = (struct iovec){ 1305 .iov_base = repbuf, 1306 .iov_len = snprintf(repbuf, sizeof(repbuf), 1307 "last message repeated %d times", f->f_prevcount) 1308 }; 1309 } else { 1310 iov[5] = (struct iovec){ 1311 .iov_base = f->f_prevline, 1312 .iov_len = f->f_prevlen 1313 }; 1314 } 1315 dprintf("Logging to %s", TypeNames[f->f_type]); 1316 f->f_time = now; 1317 1318 switch (f->f_type) { 1319 case F_UNUSED: 1320 dprintf("\n"); 1321 break; 1322 1323 case F_FORW: 1324 dprintf(" %s", f->fu_forw_hname); 1325 switch (f->fu_forw_addr->ai_addr->sa_family) { 1326 #ifdef INET 1327 case AF_INET: 1328 dprintf(":%d\n", 1329 ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); 1330 break; 1331 #endif 1332 #ifdef INET6 1333 case AF_INET6: 1334 dprintf(":%d\n", 1335 ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); 1336 break; 1337 #endif 1338 default: 1339 dprintf("\n"); 1340 } 1341 /* check for local vs remote messages */ 1342 if (strcasecmp(f->f_prevhost, LocalHostName)) 1343 l = snprintf(line, sizeof line - 1, 1344 "<%d>%.15s Forwarded from %s: %s", 1345 f->f_prevpri, (char *)iov[0].iov_base, 1346 f->f_prevhost, (char *)iov[5].iov_base); 1347 else 1348 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1349 f->f_prevpri, (char *)iov[0].iov_base, 1350 (char *)iov[5].iov_base); 1351 if (l < 0) 1352 l = 0; 1353 else if (l > MAXLINE) 1354 l = MAXLINE; 1355 1356 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1357 struct socklist *sl; 1358 1359 STAILQ_FOREACH(sl, &shead, next) { 1360 if (sl->sl_ss.ss_family == AF_LOCAL || 1361 sl->sl_ss.ss_family == AF_UNSPEC || 1362 sl->sl_socket < 0) 1363 continue; 1364 lsent = sendto(sl->sl_socket, line, l, 0, 1365 r->ai_addr, r->ai_addrlen); 1366 if (lsent == l) 1367 break; 1368 } 1369 if (lsent == l && !send_to_all) 1370 break; 1371 } 1372 dprintf("lsent/l: %d/%d\n", lsent, l); 1373 if (lsent != l) { 1374 int e = errno; 1375 logerror("sendto"); 1376 errno = e; 1377 switch (errno) { 1378 case ENOBUFS: 1379 case ENETDOWN: 1380 case ENETUNREACH: 1381 case EHOSTUNREACH: 1382 case EHOSTDOWN: 1383 case EADDRNOTAVAIL: 1384 break; 1385 /* case EBADF: */ 1386 /* case EACCES: */ 1387 /* case ENOTSOCK: */ 1388 /* case EFAULT: */ 1389 /* case EMSGSIZE: */ 1390 /* case EAGAIN: */ 1391 /* case ENOBUFS: */ 1392 /* case ECONNREFUSED: */ 1393 default: 1394 dprintf("removing entry: errno=%d\n", e); 1395 f->f_type = F_UNUSED; 1396 break; 1397 } 1398 } 1399 break; 1400 1401 case F_FILE: 1402 dprintf(" %s\n", f->fu_fname); 1403 iov[6] = (struct iovec){ 1404 .iov_base = lf, 1405 .iov_len = 1 1406 }; 1407 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1408 /* 1409 * If writev(2) fails for potentially transient errors 1410 * like the filesystem being full, ignore it. 1411 * Otherwise remove this logfile from the list. 1412 */ 1413 if (errno != ENOSPC) { 1414 int e = errno; 1415 close_filed(f); 1416 errno = e; 1417 logerror(f->fu_fname); 1418 } 1419 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1420 f->f_flags |= FFLAG_NEEDSYNC; 1421 needdofsync = 1; 1422 } 1423 break; 1424 1425 case F_PIPE: 1426 dprintf(" %s\n", f->fu_pipe_pname); 1427 iov[6] = (struct iovec){ 1428 .iov_base = lf, 1429 .iov_len = 1 1430 }; 1431 if (f->fu_pipe_pid == 0) { 1432 if ((f->f_file = p_open(f->fu_pipe_pname, 1433 &f->fu_pipe_pid)) < 0) { 1434 logerror(f->fu_pipe_pname); 1435 break; 1436 } 1437 } 1438 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1439 int e = errno; 1440 1441 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1442 close_filed(f); 1443 errno = e; 1444 logerror(f->fu_pipe_pname); 1445 } 1446 break; 1447 1448 case F_CONSOLE: 1449 if (flags & IGN_CONS) { 1450 dprintf(" (ignored)\n"); 1451 break; 1452 } 1453 /* FALLTHROUGH */ 1454 1455 case F_TTY: 1456 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1457 iov[6] = (struct iovec){ 1458 .iov_base = crlf, 1459 .iov_len = 2 1460 }; 1461 errno = 0; /* ttymsg() only sometimes returns an errno */ 1462 if ((msgret = ttymsg(iov, nitems(iov), f->fu_fname, 10))) { 1463 f->f_type = F_UNUSED; 1464 logerror(msgret); 1465 } 1466 break; 1467 1468 case F_USERS: 1469 case F_WALL: 1470 dprintf("\n"); 1471 iov[6] = (struct iovec){ 1472 .iov_base = crlf, 1473 .iov_len = 2 1474 }; 1475 wallmsg(f, iov, nitems(iov)); 1476 break; 1477 } 1478 f->f_prevcount = 0; 1479 free(wmsg); 1480 } 1481 1482 /* 1483 * WALLMSG -- Write a message to the world at large 1484 * 1485 * Write the specified message to either the entire 1486 * world, or a list of approved users. 1487 */ 1488 static void 1489 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1490 { 1491 static int reenter; /* avoid calling ourselves */ 1492 struct utmpx *ut; 1493 int i; 1494 const char *p; 1495 1496 if (reenter++) 1497 return; 1498 setutxent(); 1499 /* NOSTRICT */ 1500 while ((ut = getutxent()) != NULL) { 1501 if (ut->ut_type != USER_PROCESS) 1502 continue; 1503 if (f->f_type == F_WALL) { 1504 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1505 TTYMSGTIME)) != NULL) { 1506 errno = 0; /* already in msg */ 1507 logerror(p); 1508 } 1509 continue; 1510 } 1511 /* should we send the message to this user? */ 1512 for (i = 0; i < MAXUNAMES; i++) { 1513 if (!f->fu_uname[i][0]) 1514 break; 1515 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 1516 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 1517 TTYMSGTIME)) != NULL) { 1518 errno = 0; /* already in msg */ 1519 logerror(p); 1520 } 1521 break; 1522 } 1523 } 1524 } 1525 endutxent(); 1526 reenter = 0; 1527 } 1528 1529 /* 1530 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 1531 */ 1532 static const char * 1533 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 1534 { 1535 static char device[1024]; 1536 static char errbuf[1024]; 1537 struct stat sb; 1538 1539 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 1540 1541 if (stat(device, &sb) < 0) { 1542 (void) snprintf(errbuf, sizeof(errbuf), 1543 "%s: %s", device, strerror(errno)); 1544 return (errbuf); 1545 } 1546 if ((sb.st_mode & S_IWGRP) == 0) 1547 /* Messages disabled. */ 1548 return (NULL); 1549 return ttymsg(iov, iovcnt, line, tmout); 1550 } 1551 1552 static void 1553 reapchild(int signo __unused) 1554 { 1555 int status; 1556 pid_t pid; 1557 struct filed *f; 1558 1559 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1560 /* First, look if it's a process from the dead queue. */ 1561 if (deadq_removebypid(pid)) 1562 continue; 1563 1564 /* Now, look in list of active processes. */ 1565 STAILQ_FOREACH(f, &fhead, next) { 1566 if (f->f_type == F_PIPE && 1567 f->fu_pipe_pid == pid) { 1568 close_filed(f); 1569 log_deadchild(pid, status, f->fu_pipe_pname); 1570 break; 1571 } 1572 } 1573 } 1574 WantReapchild = 0; 1575 } 1576 1577 /* 1578 * Return a printable representation of a host address. 1579 */ 1580 static const char * 1581 cvthname(struct sockaddr *f) 1582 { 1583 int error, hl; 1584 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1585 1586 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 1587 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 1588 NI_NUMERICHOST); 1589 if (error) { 1590 dprintf("Malformed from address %s\n", gai_strerror(error)); 1591 return ("???"); 1592 } 1593 dprintf("cvthname(%s)\n", ip); 1594 1595 if (!resolve) 1596 return (ip); 1597 1598 error = getnameinfo(f, f->sa_len, hname, sizeof(hname), 1599 NULL, 0, NI_NAMEREQD); 1600 if (error) { 1601 dprintf("Host name for your address (%s) unknown\n", ip); 1602 return (ip); 1603 } 1604 hl = strlen(hname); 1605 if (hl > 0 && hname[hl-1] == '.') 1606 hname[--hl] = '\0'; 1607 trimdomain(hname, hl); 1608 return (hname); 1609 } 1610 1611 static void 1612 dodie(int signo) 1613 { 1614 1615 WantDie = signo; 1616 } 1617 1618 static void 1619 domark(int signo __unused) 1620 { 1621 1622 MarkSet = 1; 1623 } 1624 1625 /* 1626 * Print syslogd errors some place. 1627 */ 1628 static void 1629 logerror(const char *type) 1630 { 1631 char buf[512]; 1632 static int recursed = 0; 1633 1634 /* If there's an error while trying to log an error, give up. */ 1635 if (recursed) 1636 return; 1637 recursed++; 1638 if (errno) 1639 (void)snprintf(buf, 1640 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1641 else 1642 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1643 errno = 0; 1644 dprintf("%s\n", buf); 1645 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1646 recursed--; 1647 } 1648 1649 static void 1650 die(int signo) 1651 { 1652 struct filed *f; 1653 struct socklist *sl; 1654 char buf[100]; 1655 1656 STAILQ_FOREACH(f, &fhead, next) { 1657 /* flush any pending output */ 1658 if (f->f_prevcount) 1659 fprintlog(f, 0, (char *)NULL); 1660 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0) 1661 close_filed(f); 1662 } 1663 if (signo) { 1664 dprintf("syslogd: exiting on signal %d\n", signo); 1665 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1666 errno = 0; 1667 logerror(buf); 1668 } 1669 STAILQ_FOREACH(sl, &shead, next) { 1670 if (sl->sl_ss.ss_family == AF_LOCAL) 1671 unlink(sl->sl_peer->pe_name); 1672 } 1673 pidfile_remove(pfh); 1674 1675 exit(1); 1676 } 1677 1678 static int 1679 configfiles(const struct dirent *dp) 1680 { 1681 const char *p; 1682 size_t ext_len; 1683 1684 if (dp->d_name[0] == '.') 1685 return (0); 1686 1687 ext_len = sizeof(include_ext) -1; 1688 1689 if (dp->d_namlen <= ext_len) 1690 return (0); 1691 1692 p = &dp->d_name[dp->d_namlen - ext_len]; 1693 if (strcmp(p, include_ext) != 0) 1694 return (0); 1695 1696 return (1); 1697 } 1698 1699 static void 1700 readconfigfile(FILE *cf, int allow_includes) 1701 { 1702 FILE *cf2; 1703 struct filed *f; 1704 struct dirent **ent; 1705 char cline[LINE_MAX]; 1706 char host[MAXHOSTNAMELEN]; 1707 char prog[LINE_MAX]; 1708 char file[MAXPATHLEN]; 1709 char *p, *tmp; 1710 int i, nents; 1711 size_t include_len; 1712 1713 /* 1714 * Foreach line in the conf table, open that file. 1715 */ 1716 include_len = sizeof(include_str) -1; 1717 (void)strlcpy(host, "*", sizeof(host)); 1718 (void)strlcpy(prog, "*", sizeof(prog)); 1719 while (fgets(cline, sizeof(cline), cf) != NULL) { 1720 /* 1721 * check for end-of-section, comments, strip off trailing 1722 * spaces and newline character. #!prog is treated specially: 1723 * following lines apply only to that program. 1724 */ 1725 for (p = cline; isspace(*p); ++p) 1726 continue; 1727 if (*p == 0) 1728 continue; 1729 if (allow_includes && 1730 strncmp(p, include_str, include_len) == 0 && 1731 isspace(p[include_len])) { 1732 p += include_len; 1733 while (isspace(*p)) 1734 p++; 1735 tmp = p; 1736 while (*tmp != '\0' && !isspace(*tmp)) 1737 tmp++; 1738 *tmp = '\0'; 1739 dprintf("Trying to include files in '%s'\n", p); 1740 nents = scandir(p, &ent, configfiles, alphasort); 1741 if (nents == -1) { 1742 dprintf("Unable to open '%s': %s\n", p, 1743 strerror(errno)); 1744 continue; 1745 } 1746 for (i = 0; i < nents; i++) { 1747 if (snprintf(file, sizeof(file), "%s/%s", p, 1748 ent[i]->d_name) >= (int)sizeof(file)) { 1749 dprintf("ignoring path too long: " 1750 "'%s/%s'\n", p, ent[i]->d_name); 1751 free(ent[i]); 1752 continue; 1753 } 1754 free(ent[i]); 1755 cf2 = fopen(file, "r"); 1756 if (cf2 == NULL) 1757 continue; 1758 dprintf("reading %s\n", file); 1759 readconfigfile(cf2, 0); 1760 fclose(cf2); 1761 } 1762 free(ent); 1763 continue; 1764 } 1765 if (*p == '#') { 1766 p++; 1767 if (*p != '!' && *p != '+' && *p != '-') 1768 continue; 1769 } 1770 if (*p == '+' || *p == '-') { 1771 host[0] = *p++; 1772 while (isspace(*p)) 1773 p++; 1774 if ((!*p) || (*p == '*')) { 1775 (void)strlcpy(host, "*", sizeof(host)); 1776 continue; 1777 } 1778 if (*p == '@') 1779 p = LocalHostName; 1780 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1781 if (!isalnum(*p) && *p != '.' && *p != '-' 1782 && *p != ',' && *p != ':' && *p != '%') 1783 break; 1784 host[i] = *p++; 1785 } 1786 host[i] = '\0'; 1787 continue; 1788 } 1789 if (*p == '!') { 1790 p++; 1791 while (isspace(*p)) p++; 1792 if ((!*p) || (*p == '*')) { 1793 (void)strlcpy(prog, "*", sizeof(prog)); 1794 continue; 1795 } 1796 for (i = 0; i < LINE_MAX - 1; i++) { 1797 if (!isprint(p[i]) || isspace(p[i])) 1798 break; 1799 prog[i] = p[i]; 1800 } 1801 prog[i] = 0; 1802 continue; 1803 } 1804 for (p = cline + 1; *p != '\0'; p++) { 1805 if (*p != '#') 1806 continue; 1807 if (*(p - 1) == '\\') { 1808 strcpy(p - 1, p); 1809 p--; 1810 continue; 1811 } 1812 *p = '\0'; 1813 break; 1814 } 1815 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1816 cline[i] = '\0'; 1817 f = cfline(cline, prog, host); 1818 if (f != NULL) 1819 addfile(f); 1820 } 1821 } 1822 1823 static void 1824 sighandler(int signo) 1825 { 1826 1827 /* Send an wake-up signal to the select() loop. */ 1828 write(sigpipe[1], &signo, sizeof(signo)); 1829 } 1830 1831 /* 1832 * INIT -- Initialize syslogd from configuration table 1833 */ 1834 static void 1835 init(int signo) 1836 { 1837 int i; 1838 FILE *cf; 1839 struct filed *f; 1840 char *p; 1841 char oldLocalHostName[MAXHOSTNAMELEN]; 1842 char hostMsg[2*MAXHOSTNAMELEN+40]; 1843 char bootfileMsg[LINE_MAX]; 1844 1845 dprintf("init\n"); 1846 WantInitialize = 0; 1847 1848 /* 1849 * Load hostname (may have changed). 1850 */ 1851 if (signo != 0) 1852 (void)strlcpy(oldLocalHostName, LocalHostName, 1853 sizeof(oldLocalHostName)); 1854 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1855 err(EX_OSERR, "gethostname() failed"); 1856 if ((p = strchr(LocalHostName, '.')) != NULL) { 1857 *p++ = '\0'; 1858 LocalDomain = p; 1859 } else { 1860 LocalDomain = ""; 1861 } 1862 1863 /* 1864 * Load / reload timezone data (in case it changed). 1865 * 1866 * Just calling tzset() again does not work, the timezone code 1867 * caches the result. However, by setting the TZ variable, one 1868 * can defeat the caching and have the timezone code really 1869 * reload the timezone data. Respect any initial setting of 1870 * TZ, in case the system is configured specially. 1871 */ 1872 dprintf("loading timezone data via tzset()\n"); 1873 if (getenv("TZ")) { 1874 tzset(); 1875 } else { 1876 setenv("TZ", ":/etc/localtime", 1); 1877 tzset(); 1878 unsetenv("TZ"); 1879 } 1880 1881 /* 1882 * Close all open log files. 1883 */ 1884 Initialized = 0; 1885 STAILQ_FOREACH(f, &fhead, next) { 1886 /* flush any pending output */ 1887 if (f->f_prevcount) 1888 fprintlog(f, 0, (char *)NULL); 1889 1890 switch (f->f_type) { 1891 case F_FILE: 1892 case F_FORW: 1893 case F_CONSOLE: 1894 case F_TTY: 1895 close_filed(f); 1896 break; 1897 case F_PIPE: 1898 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1899 close_filed(f); 1900 break; 1901 } 1902 } 1903 while(!STAILQ_EMPTY(&fhead)) { 1904 f = STAILQ_FIRST(&fhead); 1905 STAILQ_REMOVE_HEAD(&fhead, next); 1906 free(f->f_program); 1907 free(f->f_host); 1908 free(f); 1909 } 1910 1911 /* open the configuration file */ 1912 if ((cf = fopen(ConfFile, "r")) == NULL) { 1913 dprintf("cannot open %s\n", ConfFile); 1914 f = cfline("*.ERR\t/dev/console", "*", "*"); 1915 if (f != NULL) 1916 addfile(f); 1917 f = cfline("*.PANIC\t*", "*", "*"); 1918 if (f != NULL) 1919 addfile(f); 1920 Initialized = 1; 1921 1922 return; 1923 } 1924 1925 readconfigfile(cf, 1); 1926 1927 /* close the configuration file */ 1928 (void)fclose(cf); 1929 1930 Initialized = 1; 1931 1932 if (Debug) { 1933 int port; 1934 STAILQ_FOREACH(f, &fhead, next) { 1935 for (i = 0; i <= LOG_NFACILITIES; i++) 1936 if (f->f_pmask[i] == INTERNAL_NOPRI) 1937 printf("X "); 1938 else 1939 printf("%d ", f->f_pmask[i]); 1940 printf("%s: ", TypeNames[f->f_type]); 1941 switch (f->f_type) { 1942 case F_FILE: 1943 printf("%s", f->fu_fname); 1944 break; 1945 1946 case F_CONSOLE: 1947 case F_TTY: 1948 printf("%s%s", _PATH_DEV, f->fu_fname); 1949 break; 1950 1951 case F_FORW: 1952 switch (f->fu_forw_addr->ai_addr->sa_family) { 1953 #ifdef INET 1954 case AF_INET: 1955 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 1956 break; 1957 #endif 1958 #ifdef INET6 1959 case AF_INET6: 1960 port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port); 1961 break; 1962 #endif 1963 default: 1964 port = 0; 1965 } 1966 if (port != 514) { 1967 printf("%s:%d", 1968 f->fu_forw_hname, port); 1969 } else { 1970 printf("%s", f->fu_forw_hname); 1971 } 1972 break; 1973 1974 case F_PIPE: 1975 printf("%s", f->fu_pipe_pname); 1976 break; 1977 1978 case F_USERS: 1979 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 1980 printf("%s, ", f->fu_uname[i]); 1981 break; 1982 } 1983 if (f->f_program) 1984 printf(" (%s)", f->f_program); 1985 printf("\n"); 1986 } 1987 } 1988 1989 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1990 dprintf("syslogd: restarted\n"); 1991 /* 1992 * Log a change in hostname, but only on a restart. 1993 */ 1994 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1995 (void)snprintf(hostMsg, sizeof(hostMsg), 1996 "syslogd: hostname changed, \"%s\" to \"%s\"", 1997 oldLocalHostName, LocalHostName); 1998 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1999 dprintf("%s\n", hostMsg); 2000 } 2001 /* 2002 * Log the kernel boot file if we aren't going to use it as 2003 * the prefix, and if this is *not* a restart. 2004 */ 2005 if (signo == 0 && !use_bootfile) { 2006 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 2007 "syslogd: kernel boot file is %s", bootfile); 2008 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 2009 dprintf("%s\n", bootfileMsg); 2010 } 2011 } 2012 2013 /* 2014 * Crack a configuration file line 2015 */ 2016 static struct filed * 2017 cfline(const char *line, const char *prog, const char *host) 2018 { 2019 struct filed *f; 2020 struct addrinfo hints, *res; 2021 int error, i, pri, syncfile; 2022 const char *p, *q; 2023 char *bp; 2024 char buf[MAXLINE], ebuf[100]; 2025 2026 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 2027 2028 f = calloc(1, sizeof(*f)); 2029 if (f == NULL) { 2030 logerror("malloc"); 2031 exit(1); 2032 } 2033 errno = 0; /* keep strerror() stuff out of logerror messages */ 2034 2035 for (i = 0; i <= LOG_NFACILITIES; i++) 2036 f->f_pmask[i] = INTERNAL_NOPRI; 2037 2038 /* save hostname if any */ 2039 if (host && *host == '*') 2040 host = NULL; 2041 if (host) { 2042 int hl; 2043 2044 f->f_host = strdup(host); 2045 if (f->f_host == NULL) { 2046 logerror("strdup"); 2047 exit(1); 2048 } 2049 hl = strlen(f->f_host); 2050 if (hl > 0 && f->f_host[hl-1] == '.') 2051 f->f_host[--hl] = '\0'; 2052 trimdomain(f->f_host, hl); 2053 } 2054 2055 /* save program name if any */ 2056 if (prog && *prog == '*') 2057 prog = NULL; 2058 if (prog) { 2059 f->f_program = strdup(prog); 2060 if (f->f_program == NULL) { 2061 logerror("strdup"); 2062 exit(1); 2063 } 2064 } 2065 2066 /* scan through the list of selectors */ 2067 for (p = line; *p && *p != '\t' && *p != ' ';) { 2068 int pri_done; 2069 int pri_cmp; 2070 int pri_invert; 2071 2072 /* find the end of this facility name list */ 2073 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2074 continue; 2075 2076 /* get the priority comparison */ 2077 pri_cmp = 0; 2078 pri_done = 0; 2079 pri_invert = 0; 2080 if (*q == '!') { 2081 pri_invert = 1; 2082 q++; 2083 } 2084 while (!pri_done) { 2085 switch (*q) { 2086 case '<': 2087 pri_cmp |= PRI_LT; 2088 q++; 2089 break; 2090 case '=': 2091 pri_cmp |= PRI_EQ; 2092 q++; 2093 break; 2094 case '>': 2095 pri_cmp |= PRI_GT; 2096 q++; 2097 break; 2098 default: 2099 pri_done++; 2100 break; 2101 } 2102 } 2103 2104 /* collect priority name */ 2105 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2106 *bp++ = *q++; 2107 *bp = '\0'; 2108 2109 /* skip cruft */ 2110 while (strchr(",;", *q)) 2111 q++; 2112 2113 /* decode priority name */ 2114 if (*buf == '*') { 2115 pri = LOG_PRIMASK; 2116 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2117 } else { 2118 /* Ignore trailing spaces. */ 2119 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2120 buf[i] = '\0'; 2121 2122 pri = decode(buf, prioritynames); 2123 if (pri < 0) { 2124 errno = 0; 2125 (void)snprintf(ebuf, sizeof ebuf, 2126 "unknown priority name \"%s\"", buf); 2127 logerror(ebuf); 2128 free(f); 2129 return (NULL); 2130 } 2131 } 2132 if (!pri_cmp) 2133 pri_cmp = (UniquePriority) 2134 ? (PRI_EQ) 2135 : (PRI_EQ | PRI_GT) 2136 ; 2137 if (pri_invert) 2138 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2139 2140 /* scan facilities */ 2141 while (*p && !strchr("\t.; ", *p)) { 2142 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2143 *bp++ = *p++; 2144 *bp = '\0'; 2145 2146 if (*buf == '*') { 2147 for (i = 0; i < LOG_NFACILITIES; i++) { 2148 f->f_pmask[i] = pri; 2149 f->f_pcmp[i] = pri_cmp; 2150 } 2151 } else { 2152 i = decode(buf, facilitynames); 2153 if (i < 0) { 2154 errno = 0; 2155 (void)snprintf(ebuf, sizeof ebuf, 2156 "unknown facility name \"%s\"", 2157 buf); 2158 logerror(ebuf); 2159 free(f); 2160 return (NULL); 2161 } 2162 f->f_pmask[i >> 3] = pri; 2163 f->f_pcmp[i >> 3] = pri_cmp; 2164 } 2165 while (*p == ',' || *p == ' ') 2166 p++; 2167 } 2168 2169 p = q; 2170 } 2171 2172 /* skip to action part */ 2173 while (*p == '\t' || *p == ' ') 2174 p++; 2175 2176 if (*p == '-') { 2177 syncfile = 0; 2178 p++; 2179 } else 2180 syncfile = 1; 2181 2182 switch (*p) { 2183 case '@': 2184 { 2185 char *tp; 2186 char endkey = ':'; 2187 /* 2188 * scan forward to see if there is a port defined. 2189 * so we can't use strlcpy.. 2190 */ 2191 i = sizeof(f->fu_forw_hname); 2192 tp = f->fu_forw_hname; 2193 p++; 2194 2195 /* 2196 * an ipv6 address should start with a '[' in that case 2197 * we should scan for a ']' 2198 */ 2199 if (*p == '[') { 2200 p++; 2201 endkey = ']'; 2202 } 2203 while (*p && (*p != endkey) && (i-- > 0)) { 2204 *tp++ = *p++; 2205 } 2206 if (endkey == ']' && *p == endkey) 2207 p++; 2208 *tp = '\0'; 2209 } 2210 /* See if we copied a domain and have a port */ 2211 if (*p == ':') 2212 p++; 2213 else 2214 p = NULL; 2215 2216 hints = (struct addrinfo){ 2217 .ai_family = family, 2218 .ai_socktype = SOCK_DGRAM 2219 }; 2220 error = getaddrinfo(f->fu_forw_hname, 2221 p ? p : "syslog", &hints, &res); 2222 if (error) { 2223 logerror(gai_strerror(error)); 2224 break; 2225 } 2226 f->fu_forw_addr = res; 2227 f->f_type = F_FORW; 2228 break; 2229 2230 case '/': 2231 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2232 f->f_type = F_UNUSED; 2233 logerror(p); 2234 break; 2235 } 2236 if (syncfile) 2237 f->f_flags |= FFLAG_SYNC; 2238 if (isatty(f->f_file)) { 2239 if (strcmp(p, ctty) == 0) 2240 f->f_type = F_CONSOLE; 2241 else 2242 f->f_type = F_TTY; 2243 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 2244 sizeof(f->fu_fname)); 2245 } else { 2246 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 2247 f->f_type = F_FILE; 2248 } 2249 break; 2250 2251 case '|': 2252 f->fu_pipe_pid = 0; 2253 (void)strlcpy(f->fu_pipe_pname, p + 1, 2254 sizeof(f->fu_pipe_pname)); 2255 f->f_type = F_PIPE; 2256 break; 2257 2258 case '*': 2259 f->f_type = F_WALL; 2260 break; 2261 2262 default: 2263 for (i = 0; i < MAXUNAMES && *p; i++) { 2264 for (q = p; *q && *q != ','; ) 2265 q++; 2266 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 2267 if ((q - p) >= MAXLOGNAME) 2268 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 2269 else 2270 f->fu_uname[i][q - p] = '\0'; 2271 while (*q == ',' || *q == ' ') 2272 q++; 2273 p = q; 2274 } 2275 f->f_type = F_USERS; 2276 break; 2277 } 2278 return (f); 2279 } 2280 2281 2282 /* 2283 * Decode a symbolic name to a numeric value 2284 */ 2285 static int 2286 decode(const char *name, const CODE *codetab) 2287 { 2288 const CODE *c; 2289 char *p, buf[40]; 2290 2291 if (isdigit(*name)) 2292 return (atoi(name)); 2293 2294 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2295 if (isupper(*name)) 2296 *p = tolower(*name); 2297 else 2298 *p = *name; 2299 } 2300 *p = '\0'; 2301 for (c = codetab; c->c_name; c++) 2302 if (!strcmp(buf, c->c_name)) 2303 return (c->c_val); 2304 2305 return (-1); 2306 } 2307 2308 static void 2309 markit(void) 2310 { 2311 struct filed *f; 2312 struct deadq_entry *dq, *dq0; 2313 2314 now = time((time_t *)NULL); 2315 MarkSeq += TIMERINTVL; 2316 if (MarkSeq >= MarkInterval) { 2317 logmsg(LOG_INFO, "-- MARK --", 2318 LocalHostName, ADDDATE|MARK); 2319 MarkSeq = 0; 2320 } 2321 2322 STAILQ_FOREACH(f, &fhead, next) { 2323 if (f->f_prevcount && now >= REPEATTIME(f)) { 2324 dprintf("flush %s: repeated %d times, %d sec.\n", 2325 TypeNames[f->f_type], f->f_prevcount, 2326 repeatinterval[f->f_repeatcount]); 2327 fprintlog(f, 0, (char *)NULL); 2328 BACKOFF(f); 2329 } 2330 } 2331 2332 /* Walk the dead queue, and see if we should signal somebody. */ 2333 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 2334 switch (dq->dq_timeout) { 2335 case 0: 2336 /* Already signalled once, try harder now. */ 2337 if (kill(dq->dq_pid, SIGKILL) != 0) 2338 (void)deadq_remove(dq); 2339 break; 2340 2341 case 1: 2342 /* 2343 * Timed out on dead queue, send terminate 2344 * signal. Note that we leave the removal 2345 * from the dead queue to reapchild(), which 2346 * will also log the event (unless the process 2347 * didn't even really exist, in case we simply 2348 * drop it from the dead queue). 2349 */ 2350 if (kill(dq->dq_pid, SIGTERM) != 0) 2351 (void)deadq_remove(dq); 2352 else 2353 dq->dq_timeout--; 2354 break; 2355 default: 2356 dq->dq_timeout--; 2357 } 2358 } 2359 MarkSet = 0; 2360 (void)alarm(TIMERINTVL); 2361 } 2362 2363 /* 2364 * fork off and become a daemon, but wait for the child to come online 2365 * before returning to the parent, or we get disk thrashing at boot etc. 2366 * Set a timer so we don't hang forever if it wedges. 2367 */ 2368 static int 2369 waitdaemon(int maxwait) 2370 { 2371 int fd; 2372 int status; 2373 pid_t pid, childpid; 2374 2375 switch (childpid = fork()) { 2376 case -1: 2377 return (-1); 2378 case 0: 2379 break; 2380 default: 2381 signal(SIGALRM, timedout); 2382 alarm(maxwait); 2383 while ((pid = wait3(&status, 0, NULL)) != -1) { 2384 if (WIFEXITED(status)) 2385 errx(1, "child pid %d exited with return code %d", 2386 pid, WEXITSTATUS(status)); 2387 if (WIFSIGNALED(status)) 2388 errx(1, "child pid %d exited on signal %d%s", 2389 pid, WTERMSIG(status), 2390 WCOREDUMP(status) ? " (core dumped)" : 2391 ""); 2392 if (pid == childpid) /* it's gone... */ 2393 break; 2394 } 2395 exit(0); 2396 } 2397 2398 if (setsid() == -1) 2399 return (-1); 2400 2401 (void)chdir("/"); 2402 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2403 (void)dup2(fd, STDIN_FILENO); 2404 (void)dup2(fd, STDOUT_FILENO); 2405 (void)dup2(fd, STDERR_FILENO); 2406 if (fd > STDERR_FILENO) 2407 (void)close(fd); 2408 } 2409 return (getppid()); 2410 } 2411 2412 /* 2413 * We get a SIGALRM from the child when it's running and finished doing it's 2414 * fsync()'s or O_SYNC writes for all the boot messages. 2415 * 2416 * We also get a signal from the kernel if the timer expires, so check to 2417 * see what happened. 2418 */ 2419 static void 2420 timedout(int sig __unused) 2421 { 2422 int left; 2423 left = alarm(0); 2424 signal(SIGALRM, SIG_DFL); 2425 if (left == 0) 2426 errx(1, "timed out waiting for child"); 2427 else 2428 _exit(0); 2429 } 2430 2431 /* 2432 * Add `s' to the list of allowable peer addresses to accept messages 2433 * from. 2434 * 2435 * `s' is a string in the form: 2436 * 2437 * [*]domainname[:{servicename|portnumber|*}] 2438 * 2439 * or 2440 * 2441 * netaddr/maskbits[:{servicename|portnumber|*}] 2442 * 2443 * Returns -1 on error, 0 if the argument was valid. 2444 */ 2445 static int 2446 allowaddr(char *s) 2447 { 2448 #if defined(INET) || defined(INET6) 2449 char *cp1, *cp2; 2450 struct allowedpeer *ap; 2451 struct servent *se; 2452 int masklen = -1; 2453 struct addrinfo hints, *res = NULL; 2454 #ifdef INET 2455 in_addr_t *addrp, *maskp; 2456 #endif 2457 #ifdef INET6 2458 uint32_t *addr6p, *mask6p; 2459 #endif 2460 char ip[NI_MAXHOST]; 2461 2462 ap = calloc(1, sizeof(*ap)); 2463 if (ap == NULL) 2464 err(1, "malloc failed"); 2465 2466 #ifdef INET6 2467 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2468 #endif 2469 cp1 = s; 2470 if ((cp1 = strrchr(cp1, ':'))) { 2471 /* service/port provided */ 2472 *cp1++ = '\0'; 2473 if (strlen(cp1) == 1 && *cp1 == '*') 2474 /* any port allowed */ 2475 ap->port = 0; 2476 else if ((se = getservbyname(cp1, "udp"))) { 2477 ap->port = ntohs(se->s_port); 2478 } else { 2479 ap->port = strtol(cp1, &cp2, 0); 2480 /* port not numeric */ 2481 if (*cp2 != '\0') 2482 goto err; 2483 } 2484 } else { 2485 if ((se = getservbyname("syslog", "udp"))) 2486 ap->port = ntohs(se->s_port); 2487 else 2488 /* sanity, should not happen */ 2489 ap->port = 514; 2490 } 2491 2492 if ((cp1 = strchr(s, '/')) != NULL && 2493 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2494 *cp1 = '\0'; 2495 if ((masklen = atoi(cp1 + 1)) < 0) 2496 goto err; 2497 } 2498 #ifdef INET6 2499 if (*s == '[') { 2500 cp2 = s + strlen(s) - 1; 2501 if (*cp2 == ']') { 2502 ++s; 2503 *cp2 = '\0'; 2504 } else { 2505 cp2 = NULL; 2506 } 2507 } else { 2508 cp2 = NULL; 2509 } 2510 #endif 2511 hints = (struct addrinfo){ 2512 .ai_family = PF_UNSPEC, 2513 .ai_socktype = SOCK_DGRAM, 2514 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2515 }; 2516 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2517 ap->isnumeric = 1; 2518 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 2519 ap->a_mask = (struct sockaddr_storage){ 2520 .ss_family = res->ai_family, 2521 .ss_len = res->ai_addrlen 2522 }; 2523 switch (res->ai_family) { 2524 #ifdef INET 2525 case AF_INET: 2526 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 2527 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 2528 if (masklen < 0) { 2529 /* use default netmask */ 2530 if (IN_CLASSA(ntohl(*addrp))) 2531 *maskp = htonl(IN_CLASSA_NET); 2532 else if (IN_CLASSB(ntohl(*addrp))) 2533 *maskp = htonl(IN_CLASSB_NET); 2534 else 2535 *maskp = htonl(IN_CLASSC_NET); 2536 } else if (masklen == 0) { 2537 *maskp = 0; 2538 } else if (masklen <= 32) { 2539 /* convert masklen to netmask */ 2540 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 2541 } else { 2542 goto err; 2543 } 2544 /* Lose any host bits in the network number. */ 2545 *addrp &= *maskp; 2546 break; 2547 #endif 2548 #ifdef INET6 2549 case AF_INET6: 2550 if (masklen > 128) 2551 goto err; 2552 2553 if (masklen < 0) 2554 masklen = 128; 2555 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 2556 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 2557 /* convert masklen to netmask */ 2558 while (masklen > 0) { 2559 if (masklen < 32) { 2560 *mask6p = 2561 htonl(~(0xffffffff >> masklen)); 2562 *addr6p &= *mask6p; 2563 break; 2564 } else { 2565 *mask6p++ = 0xffffffff; 2566 addr6p++; 2567 masklen -= 32; 2568 } 2569 } 2570 break; 2571 #endif 2572 default: 2573 goto err; 2574 } 2575 freeaddrinfo(res); 2576 } else { 2577 /* arg `s' is domain name */ 2578 ap->isnumeric = 0; 2579 ap->a_name = s; 2580 if (cp1) 2581 *cp1 = '/'; 2582 #ifdef INET6 2583 if (cp2) { 2584 *cp2 = ']'; 2585 --s; 2586 } 2587 #endif 2588 } 2589 STAILQ_INSERT_TAIL(&aphead, ap, next); 2590 2591 if (Debug) { 2592 printf("allowaddr: rule "); 2593 if (ap->isnumeric) { 2594 printf("numeric, "); 2595 getnameinfo(sstosa(&ap->a_addr), 2596 (sstosa(&ap->a_addr))->sa_len, 2597 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2598 printf("addr = %s, ", ip); 2599 getnameinfo(sstosa(&ap->a_mask), 2600 (sstosa(&ap->a_mask))->sa_len, 2601 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2602 printf("mask = %s; ", ip); 2603 } else { 2604 printf("domainname = %s; ", ap->a_name); 2605 } 2606 printf("port = %d\n", ap->port); 2607 } 2608 #endif 2609 2610 return (0); 2611 err: 2612 if (res != NULL) 2613 freeaddrinfo(res); 2614 free(ap); 2615 return (-1); 2616 } 2617 2618 /* 2619 * Validate that the remote peer has permission to log to us. 2620 */ 2621 static int 2622 validate(struct sockaddr *sa, const char *hname) 2623 { 2624 int i; 2625 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2626 struct allowedpeer *ap; 2627 #ifdef INET 2628 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2629 #endif 2630 #ifdef INET6 2631 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2632 #endif 2633 struct addrinfo hints, *res; 2634 u_short sport; 2635 int num = 0; 2636 2637 STAILQ_FOREACH(ap, &aphead, next) { 2638 num++; 2639 } 2640 dprintf("# of validation rule: %d\n", num); 2641 if (num == 0) 2642 /* traditional behaviour, allow everything */ 2643 return (1); 2644 2645 (void)strlcpy(name, hname, sizeof(name)); 2646 hints = (struct addrinfo){ 2647 .ai_family = PF_UNSPEC, 2648 .ai_socktype = SOCK_DGRAM, 2649 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2650 }; 2651 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2652 freeaddrinfo(res); 2653 else if (strchr(name, '.') == NULL) { 2654 strlcat(name, ".", sizeof name); 2655 strlcat(name, LocalDomain, sizeof name); 2656 } 2657 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 2658 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2659 return (0); /* for safety, should not occur */ 2660 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2661 ip, port, name); 2662 sport = atoi(port); 2663 2664 /* now, walk down the list */ 2665 i = 0; 2666 STAILQ_FOREACH(ap, &aphead, next) { 2667 i++; 2668 if (ap->port != 0 && ap->port != sport) { 2669 dprintf("rejected in rule %d due to port mismatch.\n", 2670 i); 2671 continue; 2672 } 2673 2674 if (ap->isnumeric) { 2675 if (ap->a_addr.ss_family != sa->sa_family) { 2676 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2677 continue; 2678 } 2679 #ifdef INET 2680 else if (ap->a_addr.ss_family == AF_INET) { 2681 sin4 = satosin(sa); 2682 a4p = satosin(&ap->a_addr); 2683 m4p = satosin(&ap->a_mask); 2684 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2685 != a4p->sin_addr.s_addr) { 2686 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2687 continue; 2688 } 2689 } 2690 #endif 2691 #ifdef INET6 2692 else if (ap->a_addr.ss_family == AF_INET6) { 2693 sin6 = satosin6(sa); 2694 a6p = satosin6(&ap->a_addr); 2695 m6p = satosin6(&ap->a_mask); 2696 if (a6p->sin6_scope_id != 0 && 2697 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2698 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2699 continue; 2700 } 2701 if (IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 2702 &a6p->sin6_addr, &m6p->sin6_addr) != 0) { 2703 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2704 continue; 2705 } 2706 } 2707 #endif 2708 else 2709 continue; 2710 } else { 2711 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 2712 FNM_NOMATCH) { 2713 dprintf("rejected in rule %d due to name " 2714 "mismatch.\n", i); 2715 continue; 2716 } 2717 } 2718 dprintf("accepted in rule %d.\n", i); 2719 return (1); /* hooray! */ 2720 } 2721 return (0); 2722 } 2723 2724 /* 2725 * Fairly similar to popen(3), but returns an open descriptor, as 2726 * opposed to a FILE *. 2727 */ 2728 static int 2729 p_open(const char *prog, pid_t *rpid) 2730 { 2731 int pfd[2], nulldesc; 2732 pid_t pid; 2733 char *argv[4]; /* sh -c cmd NULL */ 2734 char errmsg[200]; 2735 2736 if (pipe(pfd) == -1) 2737 return (-1); 2738 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2739 /* we are royally screwed anyway */ 2740 return (-1); 2741 2742 switch ((pid = fork())) { 2743 case -1: 2744 close(nulldesc); 2745 return (-1); 2746 2747 case 0: 2748 (void)setsid(); /* Avoid catching SIGHUPs. */ 2749 argv[0] = strdup("sh"); 2750 argv[1] = strdup("-c"); 2751 argv[2] = strdup(prog); 2752 argv[3] = NULL; 2753 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2754 logerror("strdup"); 2755 exit(1); 2756 } 2757 2758 alarm(0); 2759 2760 /* Restore signals marked as SIG_IGN. */ 2761 (void)signal(SIGINT, SIG_DFL); 2762 (void)signal(SIGQUIT, SIG_DFL); 2763 (void)signal(SIGPIPE, SIG_DFL); 2764 2765 dup2(pfd[0], STDIN_FILENO); 2766 dup2(nulldesc, STDOUT_FILENO); 2767 dup2(nulldesc, STDERR_FILENO); 2768 closefrom(STDERR_FILENO + 1); 2769 2770 (void)execvp(_PATH_BSHELL, argv); 2771 _exit(255); 2772 } 2773 close(nulldesc); 2774 close(pfd[0]); 2775 /* 2776 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2777 * supposed to get an EWOULDBLOCK on writev(2), which is 2778 * caught by the logic above anyway, which will in turn close 2779 * the pipe, and fork a new logging subprocess if necessary. 2780 * The stale subprocess will be killed some time later unless 2781 * it terminated itself due to closing its input pipe (so we 2782 * get rid of really dead puppies). 2783 */ 2784 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2785 /* This is bad. */ 2786 (void)snprintf(errmsg, sizeof errmsg, 2787 "Warning: cannot change pipe to PID %d to " 2788 "non-blocking behaviour.", 2789 (int)pid); 2790 logerror(errmsg); 2791 } 2792 *rpid = pid; 2793 return (pfd[1]); 2794 } 2795 2796 static void 2797 deadq_enter(pid_t pid, const char *name) 2798 { 2799 struct deadq_entry *dq; 2800 int status; 2801 2802 if (pid == 0) 2803 return; 2804 /* 2805 * Be paranoid, if we can't signal the process, don't enter it 2806 * into the dead queue (perhaps it's already dead). If possible, 2807 * we try to fetch and log the child's status. 2808 */ 2809 if (kill(pid, 0) != 0) { 2810 if (waitpid(pid, &status, WNOHANG) > 0) 2811 log_deadchild(pid, status, name); 2812 return; 2813 } 2814 2815 dq = malloc(sizeof(*dq)); 2816 if (dq == NULL) { 2817 logerror("malloc"); 2818 exit(1); 2819 } 2820 *dq = (struct deadq_entry){ 2821 .dq_pid = pid, 2822 .dq_timeout = DQ_TIMO_INIT 2823 }; 2824 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 2825 } 2826 2827 static int 2828 deadq_remove(struct deadq_entry *dq) 2829 { 2830 if (dq != NULL) { 2831 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 2832 free(dq); 2833 return (1); 2834 } 2835 2836 return (0); 2837 } 2838 2839 static int 2840 deadq_removebypid(pid_t pid) 2841 { 2842 struct deadq_entry *dq; 2843 2844 TAILQ_FOREACH(dq, &deadq_head, dq_entries) { 2845 if (dq->dq_pid == pid) 2846 break; 2847 } 2848 return (deadq_remove(dq)); 2849 } 2850 2851 static void 2852 log_deadchild(pid_t pid, int status, const char *name) 2853 { 2854 int code; 2855 char buf[256]; 2856 const char *reason; 2857 2858 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2859 if (WIFSIGNALED(status)) { 2860 reason = "due to signal"; 2861 code = WTERMSIG(status); 2862 } else { 2863 reason = "with status"; 2864 code = WEXITSTATUS(status); 2865 if (code == 0) 2866 return; 2867 } 2868 (void)snprintf(buf, sizeof buf, 2869 "Logging subprocess %d (%s) exited %s %d.", 2870 pid, name, reason, code); 2871 logerror(buf); 2872 } 2873 2874 static int 2875 socksetup(struct peer *pe) 2876 { 2877 struct addrinfo hints, *res, *res0; 2878 int error; 2879 char *cp; 2880 int (*sl_recv)(struct socklist *); 2881 /* 2882 * We have to handle this case for backwards compatibility: 2883 * If there are two (or more) colons but no '[' and ']', 2884 * assume this is an inet6 address without a service. 2885 */ 2886 if (pe->pe_name != NULL) { 2887 #ifdef INET6 2888 if (pe->pe_name[0] == '[' && 2889 (cp = strchr(pe->pe_name + 1, ']')) != NULL) { 2890 pe->pe_name = &pe->pe_name[1]; 2891 *cp = '\0'; 2892 if (cp[1] == ':' && cp[2] != '\0') 2893 pe->pe_serv = cp + 2; 2894 } else { 2895 #endif 2896 cp = strchr(pe->pe_name, ':'); 2897 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2898 *cp = '\0'; 2899 if (cp[1] != '\0') 2900 pe->pe_serv = cp + 1; 2901 if (cp == pe->pe_name) 2902 pe->pe_name = NULL; 2903 } 2904 #ifdef INET6 2905 } 2906 #endif 2907 } 2908 hints = (struct addrinfo){ 2909 .ai_family = AF_UNSPEC, 2910 .ai_socktype = SOCK_DGRAM, 2911 .ai_flags = AI_PASSIVE 2912 }; 2913 if (pe->pe_name != NULL) 2914 dprintf("Trying peer: %s\n", pe->pe_name); 2915 if (pe->pe_serv == NULL) 2916 pe->pe_serv = "syslog"; 2917 error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0); 2918 if (error) { 2919 char *msgbuf; 2920 2921 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", 2922 pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv, 2923 gai_strerror(error)); 2924 errno = 0; 2925 if (msgbuf == NULL) 2926 logerror(gai_strerror(error)); 2927 else 2928 logerror(msgbuf); 2929 free(msgbuf); 2930 die(0); 2931 } 2932 for (res = res0; res != NULL; res = res->ai_next) { 2933 int s; 2934 2935 if (res->ai_family != AF_LOCAL && 2936 SecureMode > 1) { 2937 /* Only AF_LOCAL in secure mode. */ 2938 continue; 2939 } 2940 if (family != AF_UNSPEC && 2941 res->ai_family != AF_LOCAL && res->ai_family != family) 2942 continue; 2943 2944 s = socket(res->ai_family, res->ai_socktype, 2945 res->ai_protocol); 2946 if (s < 0) { 2947 logerror("socket"); 2948 error++; 2949 continue; 2950 } 2951 #ifdef INET6 2952 if (res->ai_family == AF_INET6) { 2953 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, 2954 &(int){1}, sizeof(int)) < 0) { 2955 logerror("setsockopt(IPV6_V6ONLY)"); 2956 close(s); 2957 error++; 2958 continue; 2959 } 2960 } 2961 #endif 2962 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 2963 &(int){1}, sizeof(int)) < 0) { 2964 logerror("setsockopt(SO_REUSEADDR)"); 2965 close(s); 2966 error++; 2967 continue; 2968 } 2969 2970 /* 2971 * Bind INET and UNIX-domain sockets. 2972 * 2973 * A UNIX-domain socket is always bound to a pathname 2974 * regardless of -N flag. 2975 * 2976 * For INET sockets, RFC 3164 recommends that client 2977 * side message should come from the privileged syslogd port. 2978 * 2979 * If the system administrator chooses not to obey 2980 * this, we can skip the bind() step so that the 2981 * system will choose a port for us. 2982 */ 2983 if (res->ai_family == AF_LOCAL) 2984 unlink(pe->pe_name); 2985 if (res->ai_family == AF_LOCAL || 2986 NoBind == 0 || pe->pe_name != NULL) { 2987 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { 2988 logerror("bind"); 2989 close(s); 2990 error++; 2991 continue; 2992 } 2993 if (res->ai_family == AF_LOCAL || 2994 SecureMode == 0) 2995 increase_rcvbuf(s); 2996 } 2997 if (res->ai_family == AF_LOCAL && 2998 chmod(pe->pe_name, pe->pe_mode) < 0) { 2999 dprintf("chmod %s: %s\n", pe->pe_name, 3000 strerror(errno)); 3001 close(s); 3002 error++; 3003 continue; 3004 } 3005 dprintf("new socket fd is %d\n", s); 3006 if (res->ai_socktype != SOCK_DGRAM) { 3007 listen(s, 5); 3008 } 3009 sl_recv = socklist_recv_sock; 3010 #if defined(INET) || defined(INET6) 3011 if (SecureMode && (res->ai_family == AF_INET || 3012 res->ai_family == AF_INET6)) { 3013 dprintf("shutdown\n"); 3014 /* Forbid communication in secure mode. */ 3015 if (shutdown(s, SHUT_RD) < 0 && 3016 errno != ENOTCONN) { 3017 logerror("shutdown"); 3018 if (!Debug) 3019 die(0); 3020 } 3021 sl_recv = NULL; 3022 } else 3023 #endif 3024 dprintf("listening on socket\n"); 3025 dprintf("sending on socket\n"); 3026 addsock(res->ai_addr, res->ai_addrlen, 3027 &(struct socklist){ 3028 .sl_socket = s, 3029 .sl_peer = pe, 3030 .sl_recv = sl_recv 3031 }); 3032 } 3033 freeaddrinfo(res0); 3034 3035 return(error); 3036 } 3037 3038 static void 3039 increase_rcvbuf(int fd) 3040 { 3041 socklen_t len; 3042 3043 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 3044 &(socklen_t){sizeof(len)}) == 0) { 3045 if (len < RCVBUF_MINSIZE) { 3046 len = RCVBUF_MINSIZE; 3047 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 3048 } 3049 } 3050 } 3051