1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 /*- 32 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 33 * 34 * Copyright (c) 2018 Prodrive Technologies, https://prodrive-technologies.com/ 35 * Author: Ed Schouten <ed@FreeBSD.org> 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 56 * SUCH DAMAGE. 57 */ 58 59 #ifndef lint 60 static const char copyright[] = 61 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 62 The Regents of the University of California. All rights reserved.\n"; 63 #endif /* not lint */ 64 65 #ifndef lint 66 #if 0 67 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 68 #endif 69 #endif /* not lint */ 70 71 #include <sys/cdefs.h> 72 __FBSDID("$FreeBSD$"); 73 74 /* 75 * syslogd -- log system messages 76 * 77 * This program implements a system log. It takes a series of lines. 78 * Each line may have a priority, signified as "<n>" as 79 * the first characters of the line. If this is 80 * not present, a default priority is used. 81 * 82 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 83 * cause it to reread its configuration file. 84 * 85 * Defined Constants: 86 * 87 * MAXLINE -- the maximum line length that can be handled. 88 * DEFUPRI -- the default priority for user messages 89 * DEFSPRI -- the default priority for kernel messages 90 * 91 * Author: Eric Allman 92 * extensive changes by Ralph Campbell 93 * more extensive changes by Eric Allman (again) 94 * Extension to log by program name as well as facility and priority 95 * by Peter da Silva. 96 * -u and -v by Harlan Stenn. 97 * Priority comparison code by Harlan Stenn. 98 */ 99 100 /* Maximum number of characters in time of last occurrence */ 101 #define MAXLINE 2048 /* maximum line length */ 102 #define MAXSVLINE MAXLINE /* maximum saved line length */ 103 #define DEFUPRI (LOG_USER|LOG_NOTICE) 104 #define DEFSPRI (LOG_KERN|LOG_CRIT) 105 #define TIMERINTVL 30 /* interval for checking flush, mark */ 106 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 107 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 108 109 #include <sys/param.h> 110 #include <sys/ioctl.h> 111 #include <sys/mman.h> 112 #include <sys/queue.h> 113 #include <sys/resource.h> 114 #include <sys/socket.h> 115 #include <sys/stat.h> 116 #include <sys/syslimits.h> 117 #include <sys/time.h> 118 #include <sys/uio.h> 119 #include <sys/un.h> 120 #include <sys/wait.h> 121 122 #if defined(INET) || defined(INET6) 123 #include <netinet/in.h> 124 #include <arpa/inet.h> 125 #endif 126 127 #include <assert.h> 128 #include <ctype.h> 129 #include <dirent.h> 130 #include <err.h> 131 #include <errno.h> 132 #include <fcntl.h> 133 #include <fnmatch.h> 134 #include <libutil.h> 135 #include <limits.h> 136 #include <netdb.h> 137 #include <paths.h> 138 #include <signal.h> 139 #include <stdbool.h> 140 #include <stdio.h> 141 #include <stdlib.h> 142 #include <string.h> 143 #include <sysexits.h> 144 #include <unistd.h> 145 #include <utmpx.h> 146 147 #include "pathnames.h" 148 #include "ttymsg.h" 149 150 #define SYSLOG_NAMES 151 #include <sys/syslog.h> 152 153 static const char *ConfFile = _PATH_LOGCONF; 154 static const char *PidFile = _PATH_LOGPID; 155 static const char ctty[] = _PATH_CONSOLE; 156 static const char include_str[] = "include"; 157 static const char include_ext[] = ".conf"; 158 159 #define dprintf if (Debug) printf 160 161 #define MAXUNAMES 20 /* maximum number of user names */ 162 163 #define sstosa(ss) ((struct sockaddr *)(ss)) 164 #ifdef INET 165 #define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) 166 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 167 #endif 168 #ifdef INET6 169 #define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) 170 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 171 #define s6_addr32 __u6_addr.__u6_addr32 172 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 173 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 174 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 175 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 176 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 177 #endif 178 /* 179 * List of peers and sockets for binding. 180 */ 181 struct peer { 182 const char *pe_name; 183 const char *pe_serv; 184 mode_t pe_mode; 185 STAILQ_ENTRY(peer) next; 186 }; 187 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 188 189 struct socklist { 190 struct sockaddr_storage sl_ss; 191 int sl_socket; 192 struct peer *sl_peer; 193 int (*sl_recv)(struct socklist *); 194 STAILQ_ENTRY(socklist) next; 195 }; 196 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 197 198 /* 199 * Flags to logmsg(). 200 */ 201 202 #define IGN_CONS 0x001 /* don't print on console */ 203 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 204 #define MARK 0x008 /* this message is a mark */ 205 206 /* Timestamps of log entries. */ 207 struct logtime { 208 struct tm tm; 209 suseconds_t usec; 210 }; 211 212 /* Traditional syslog timestamp format. */ 213 #define RFC3164_DATELEN 15 214 #define RFC3164_DATEFMT "%b %e %H:%M:%S" 215 216 /* 217 * This structure represents the files that will have log 218 * copies printed. 219 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 220 * or if f_type is F_PIPE and f_pid > 0. 221 */ 222 223 struct filed { 224 STAILQ_ENTRY(filed) next; /* next in linked list */ 225 short f_type; /* entry type, see below */ 226 short f_file; /* file descriptor */ 227 time_t f_time; /* time this was last written */ 228 char *f_host; /* host from which to recd. */ 229 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 230 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 231 #define PRI_LT 0x1 232 #define PRI_EQ 0x2 233 #define PRI_GT 0x4 234 char *f_program; /* program this applies to */ 235 union { 236 char f_uname[MAXUNAMES][MAXLOGNAME]; 237 struct { 238 char f_hname[MAXHOSTNAMELEN]; 239 struct addrinfo *f_addr; 240 241 } f_forw; /* forwarding address */ 242 char f_fname[MAXPATHLEN]; 243 struct { 244 char f_pname[MAXPATHLEN]; 245 pid_t f_pid; 246 } f_pipe; 247 } f_un; 248 #define fu_uname f_un.f_uname 249 #define fu_forw_hname f_un.f_forw.f_hname 250 #define fu_forw_addr f_un.f_forw.f_addr 251 #define fu_fname f_un.f_fname 252 #define fu_pipe_pname f_un.f_pipe.f_pname 253 #define fu_pipe_pid f_un.f_pipe.f_pid 254 char f_prevline[MAXSVLINE]; /* last message logged */ 255 struct logtime f_lasttime; /* time of last occurrence */ 256 int f_prevpri; /* pri of f_prevline */ 257 size_t f_prevlen; /* length of f_prevline */ 258 int f_prevcount; /* repetition cnt of prevline */ 259 u_int f_repeatcount; /* number of "repeated" msgs */ 260 int f_flags; /* file-specific flags */ 261 #define FFLAG_SYNC 0x01 262 #define FFLAG_NEEDSYNC 0x02 263 }; 264 265 /* 266 * Queue of about-to-be dead processes we should watch out for. 267 */ 268 struct deadq_entry { 269 pid_t dq_pid; 270 int dq_timeout; 271 TAILQ_ENTRY(deadq_entry) dq_entries; 272 }; 273 static TAILQ_HEAD(, deadq_entry) deadq_head = 274 TAILQ_HEAD_INITIALIZER(deadq_head); 275 276 /* 277 * The timeout to apply to processes waiting on the dead queue. Unit 278 * of measure is `mark intervals', i.e. 20 minutes by default. 279 * Processes on the dead queue will be terminated after that time. 280 */ 281 282 #define DQ_TIMO_INIT 2 283 284 /* 285 * Struct to hold records of network addresses that are allowed to log 286 * to us. 287 */ 288 struct allowedpeer { 289 int isnumeric; 290 u_short port; 291 union { 292 struct { 293 struct sockaddr_storage addr; 294 struct sockaddr_storage mask; 295 } numeric; 296 char *name; 297 } u; 298 #define a_addr u.numeric.addr 299 #define a_mask u.numeric.mask 300 #define a_name u.name 301 STAILQ_ENTRY(allowedpeer) next; 302 }; 303 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 304 305 306 /* 307 * Intervals at which we flush out "message repeated" messages, 308 * in seconds after previous message is logged. After each flush, 309 * we move to the next interval until we reach the largest. 310 */ 311 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 312 #define MAXREPEAT (nitems(repeatinterval) - 1) 313 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 314 #define BACKOFF(f) do { \ 315 if (++(f)->f_repeatcount > MAXREPEAT) \ 316 (f)->f_repeatcount = MAXREPEAT; \ 317 } while (0) 318 319 /* values for f_type */ 320 #define F_UNUSED 0 /* unused entry */ 321 #define F_FILE 1 /* regular file */ 322 #define F_TTY 2 /* terminal */ 323 #define F_CONSOLE 3 /* console terminal */ 324 #define F_FORW 4 /* remote machine */ 325 #define F_USERS 5 /* list of users */ 326 #define F_WALL 6 /* everyone logged on */ 327 #define F_PIPE 7 /* pipe to program */ 328 329 static const char *TypeNames[] = { 330 "UNUSED", "FILE", "TTY", "CONSOLE", 331 "FORW", "USERS", "WALL", "PIPE" 332 }; 333 334 static STAILQ_HEAD(, filed) fhead = 335 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 336 static struct filed consfile; /* Console */ 337 338 static int Debug; /* debug flag */ 339 static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 340 static int resolve = 1; /* resolve hostname */ 341 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 342 static const char *LocalDomain; /* our local domain name */ 343 static int Initialized; /* set when we have initialized ourselves */ 344 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 345 static int MarkSeq; /* mark sequence number */ 346 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 347 static int SecureMode; /* when true, receive only unix domain socks */ 348 #ifdef INET6 349 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 350 #else 351 static int family = PF_INET; /* protocol family (IPv4 only) */ 352 #endif 353 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 354 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 355 static int use_bootfile; /* log entire bootfile for every kern msg */ 356 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 357 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 358 359 static char bootfile[MAXLINE+1]; /* booted kernel file */ 360 361 static int RemoteAddDate; /* Always set the date on remote messages */ 362 static int RemoteHostname; /* Log remote hostname from the message */ 363 364 static int UniquePriority; /* Only log specified priority? */ 365 static int LogFacPri; /* Put facility and priority in log message: */ 366 /* 0=no, 1=numeric, 2=names */ 367 static int KeepKernFac; /* Keep remotely logged kernel facility */ 368 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 369 static struct pidfh *pfh; 370 static int sigpipe[2]; /* Pipe to catch a signal during select(). */ 371 static bool RFC3164OutputFormat = true; /* Use legacy format by default. */ 372 373 static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild; 374 375 struct iovlist; 376 377 static int allowaddr(char *); 378 static int addfile(struct filed *); 379 static int addpeer(struct peer *); 380 static int addsock(struct sockaddr *, socklen_t, struct socklist *); 381 static struct filed *cfline(const char *, const char *, const char *); 382 static const char *cvthname(struct sockaddr *); 383 static void deadq_enter(pid_t, const char *); 384 static int deadq_remove(struct deadq_entry *); 385 static int deadq_removebypid(pid_t); 386 static int decode(const char *, const CODE *); 387 static void die(int) __dead2; 388 static void dodie(int); 389 static void dofsync(void); 390 static void domark(int); 391 static void fprintlog_first(struct filed *, const char *, const char *, 392 const char *, const char *, const char *, const char *, int); 393 static void fprintlog_write(struct filed *, struct iovlist *, int); 394 static void fprintlog_successive(struct filed *, int); 395 static void init(int); 396 static void logerror(const char *); 397 static void logmsg(int, const struct logtime *, const char *, const char *, 398 const char *, const char *, const char *, const char *, int); 399 static void log_deadchild(pid_t, int, const char *); 400 static void markit(void); 401 static int socksetup(struct peer *); 402 static int socklist_recv_file(struct socklist *); 403 static int socklist_recv_sock(struct socklist *); 404 static int socklist_recv_signal(struct socklist *); 405 static void sighandler(int); 406 static int skip_message(const char *, const char *, int); 407 static void parsemsg(const char *, char *); 408 static void printsys(char *); 409 static int p_open(const char *, pid_t *); 410 static void reapchild(int); 411 static const char *ttymsg_check(struct iovec *, int, char *, int); 412 static void usage(void); 413 static int validate(struct sockaddr *, const char *); 414 static void unmapped(struct sockaddr *); 415 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 416 static int waitdaemon(int); 417 static void timedout(int); 418 static void increase_rcvbuf(int); 419 420 static void 421 close_filed(struct filed *f) 422 { 423 424 if (f == NULL || f->f_file == -1) 425 return; 426 427 switch (f->f_type) { 428 case F_FORW: 429 if (f->f_un.f_forw.f_addr) { 430 freeaddrinfo(f->f_un.f_forw.f_addr); 431 f->f_un.f_forw.f_addr = NULL; 432 } 433 /* FALLTHROUGH */ 434 435 case F_FILE: 436 case F_TTY: 437 case F_CONSOLE: 438 f->f_type = F_UNUSED; 439 break; 440 case F_PIPE: 441 f->fu_pipe_pid = 0; 442 break; 443 } 444 (void)close(f->f_file); 445 f->f_file = -1; 446 } 447 448 static int 449 addfile(struct filed *f0) 450 { 451 struct filed *f; 452 453 f = calloc(1, sizeof(*f)); 454 if (f == NULL) 455 err(1, "malloc failed"); 456 *f = *f0; 457 STAILQ_INSERT_TAIL(&fhead, f, next); 458 459 return (0); 460 } 461 462 static int 463 addpeer(struct peer *pe0) 464 { 465 struct peer *pe; 466 467 pe = calloc(1, sizeof(*pe)); 468 if (pe == NULL) 469 err(1, "malloc failed"); 470 *pe = *pe0; 471 STAILQ_INSERT_TAIL(&pqueue, pe, next); 472 473 return (0); 474 } 475 476 static int 477 addsock(struct sockaddr *sa, socklen_t sa_len, struct socklist *sl0) 478 { 479 struct socklist *sl; 480 481 sl = calloc(1, sizeof(*sl)); 482 if (sl == NULL) 483 err(1, "malloc failed"); 484 *sl = *sl0; 485 if (sa != NULL && sa_len > 0) 486 memcpy(&sl->sl_ss, sa, sa_len); 487 STAILQ_INSERT_TAIL(&shead, sl, next); 488 489 return (0); 490 } 491 492 int 493 main(int argc, char *argv[]) 494 { 495 int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0; 496 fd_set *fdsr = NULL; 497 struct timeval tv, *tvp; 498 struct peer *pe; 499 struct socklist *sl; 500 pid_t ppid = 1, spid; 501 char *p; 502 503 if (madvise(NULL, 0, MADV_PROTECT) != 0) 504 dprintf("madvise() failed: %s\n", strerror(errno)); 505 506 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:m:nNoO:p:P:sS:Tuv")) 507 != -1) 508 switch (ch) { 509 #ifdef INET 510 case '4': 511 family = PF_INET; 512 break; 513 #endif 514 #ifdef INET6 515 case '6': 516 family = PF_INET6; 517 break; 518 #endif 519 case '8': 520 mask_C1 = 0; 521 break; 522 case 'A': 523 send_to_all++; 524 break; 525 case 'a': /* allow specific network addresses only */ 526 if (allowaddr(optarg) == -1) 527 usage(); 528 break; 529 case 'b': 530 bflag = 1; 531 p = strchr(optarg, ']'); 532 if (p != NULL) 533 p = strchr(p + 1, ':'); 534 else { 535 p = strchr(optarg, ':'); 536 if (p != NULL && strchr(p + 1, ':') != NULL) 537 p = NULL; /* backward compatibility */ 538 } 539 if (p == NULL) { 540 /* A hostname or filename only. */ 541 addpeer(&(struct peer){ 542 .pe_name = optarg, 543 .pe_serv = "syslog" 544 }); 545 } else { 546 /* The case of "name:service". */ 547 *p++ = '\0'; 548 addpeer(&(struct peer){ 549 .pe_serv = p, 550 .pe_name = (strlen(optarg) == 0) ? 551 NULL : optarg, 552 }); 553 } 554 break; 555 case 'c': 556 no_compress++; 557 break; 558 case 'C': 559 logflags |= O_CREAT; 560 break; 561 case 'd': /* debug */ 562 Debug++; 563 break; 564 case 'f': /* configuration file */ 565 ConfFile = optarg; 566 break; 567 case 'F': /* run in foreground instead of daemon */ 568 Foreground++; 569 break; 570 case 'H': 571 RemoteHostname = 1; 572 break; 573 case 'k': /* keep remote kern fac */ 574 KeepKernFac = 1; 575 break; 576 case 'l': 577 case 'p': 578 case 'S': 579 { 580 long perml; 581 mode_t mode; 582 char *name, *ep; 583 584 if (ch == 'l') 585 mode = DEFFILEMODE; 586 else if (ch == 'p') { 587 mode = DEFFILEMODE; 588 pflag = 1; 589 } else { 590 mode = S_IRUSR | S_IWUSR; 591 Sflag = 1; 592 } 593 if (optarg[0] == '/') 594 name = optarg; 595 else if ((name = strchr(optarg, ':')) != NULL) { 596 *name++ = '\0'; 597 if (name[0] != '/') 598 errx(1, "socket name must be absolute " 599 "path"); 600 if (isdigit(*optarg)) { 601 perml = strtol(optarg, &ep, 8); 602 if (*ep || perml < 0 || 603 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 604 errx(1, "invalid mode %s, exiting", 605 optarg); 606 mode = (mode_t )perml; 607 } else 608 errx(1, "invalid mode %s, exiting", 609 optarg); 610 } else 611 errx(1, "invalid filename %s, exiting", 612 optarg); 613 addpeer(&(struct peer){ 614 .pe_name = name, 615 .pe_mode = mode 616 }); 617 break; 618 } 619 case 'm': /* mark interval */ 620 MarkInterval = atoi(optarg) * 60; 621 break; 622 case 'N': 623 NoBind = 1; 624 SecureMode = 1; 625 break; 626 case 'n': 627 resolve = 0; 628 break; 629 case 'O': 630 if (strcmp(optarg, "bsd") == 0 || 631 strcmp(optarg, "rfc3164") == 0) 632 RFC3164OutputFormat = true; 633 else if (strcmp(optarg, "syslog") == 0 || 634 strcmp(optarg, "rfc5424") == 0) 635 RFC3164OutputFormat = false; 636 else 637 usage(); 638 break; 639 case 'o': 640 use_bootfile = 1; 641 break; 642 case 'P': /* path for alt. PID */ 643 PidFile = optarg; 644 break; 645 case 's': /* no network mode */ 646 SecureMode++; 647 break; 648 case 'T': 649 RemoteAddDate = 1; 650 break; 651 case 'u': /* only log specified priority */ 652 UniquePriority++; 653 break; 654 case 'v': /* log facility and priority */ 655 LogFacPri++; 656 break; 657 default: 658 usage(); 659 } 660 if ((argc -= optind) != 0) 661 usage(); 662 663 /* Pipe to catch a signal during select(). */ 664 s = pipe2(sigpipe, O_CLOEXEC); 665 if (s < 0) { 666 err(1, "cannot open a pipe for signals"); 667 } else { 668 addsock(NULL, 0, &(struct socklist){ 669 .sl_socket = sigpipe[0], 670 .sl_recv = socklist_recv_signal 671 }); 672 } 673 674 /* Listen by default: /dev/klog. */ 675 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 676 if (s < 0) { 677 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 678 } else { 679 addsock(NULL, 0, &(struct socklist){ 680 .sl_socket = s, 681 .sl_recv = socklist_recv_file, 682 }); 683 } 684 /* Listen by default: *:514 if no -b flag. */ 685 if (bflag == 0) 686 addpeer(&(struct peer){ 687 .pe_serv = "syslog" 688 }); 689 /* Listen by default: /var/run/log if no -p flag. */ 690 if (pflag == 0) 691 addpeer(&(struct peer){ 692 .pe_name = _PATH_LOG, 693 .pe_mode = DEFFILEMODE, 694 }); 695 /* Listen by default: /var/run/logpriv if no -S flag. */ 696 if (Sflag == 0) 697 addpeer(&(struct peer){ 698 .pe_name = _PATH_LOG_PRIV, 699 .pe_mode = S_IRUSR | S_IWUSR, 700 }); 701 STAILQ_FOREACH(pe, &pqueue, next) 702 socksetup(pe); 703 704 pfh = pidfile_open(PidFile, 0600, &spid); 705 if (pfh == NULL) { 706 if (errno == EEXIST) 707 errx(1, "syslogd already running, pid: %d", spid); 708 warn("cannot open pid file"); 709 } 710 711 if ((!Foreground) && (!Debug)) { 712 ppid = waitdaemon(30); 713 if (ppid < 0) { 714 warn("could not become daemon"); 715 pidfile_remove(pfh); 716 exit(1); 717 } 718 } else if (Debug) 719 setlinebuf(stdout); 720 721 consfile.f_type = F_CONSOLE; 722 (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1, 723 sizeof(consfile.fu_fname)); 724 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 725 (void)signal(SIGTERM, dodie); 726 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 727 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 728 (void)signal(SIGHUP, sighandler); 729 (void)signal(SIGCHLD, sighandler); 730 (void)signal(SIGALRM, domark); 731 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 732 (void)alarm(TIMERINTVL); 733 734 /* tuck my process id away */ 735 pidfile_write(pfh); 736 737 dprintf("off & running....\n"); 738 739 tvp = &tv; 740 tv.tv_sec = tv.tv_usec = 0; 741 742 STAILQ_FOREACH(sl, &shead, next) { 743 if (sl->sl_socket > fdsrmax) 744 fdsrmax = sl->sl_socket; 745 } 746 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 747 sizeof(*fdsr)); 748 if (fdsr == NULL) 749 errx(1, "calloc fd_set"); 750 751 for (;;) { 752 if (Initialized == 0) 753 init(0); 754 else if (WantInitialize) 755 init(WantInitialize); 756 if (WantReapchild) 757 reapchild(WantReapchild); 758 if (MarkSet) 759 markit(); 760 if (WantDie) { 761 free(fdsr); 762 die(WantDie); 763 } 764 765 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 766 sizeof(*fdsr)); 767 768 STAILQ_FOREACH(sl, &shead, next) { 769 if (sl->sl_socket != -1 && sl->sl_recv != NULL) 770 FD_SET(sl->sl_socket, fdsr); 771 } 772 i = select(fdsrmax + 1, fdsr, NULL, NULL, 773 needdofsync ? &tv : tvp); 774 switch (i) { 775 case 0: 776 dofsync(); 777 needdofsync = 0; 778 if (tvp) { 779 tvp = NULL; 780 if (ppid != 1) 781 kill(ppid, SIGALRM); 782 } 783 continue; 784 case -1: 785 if (errno != EINTR) 786 logerror("select"); 787 continue; 788 } 789 STAILQ_FOREACH(sl, &shead, next) { 790 if (FD_ISSET(sl->sl_socket, fdsr)) 791 (*sl->sl_recv)(sl); 792 } 793 } 794 free(fdsr); 795 } 796 797 static int 798 socklist_recv_signal(struct socklist *sl __unused) 799 { 800 ssize_t len; 801 int i, nsig, signo; 802 803 if (ioctl(sigpipe[0], FIONREAD, &i) != 0) { 804 logerror("ioctl(FIONREAD)"); 805 err(1, "signal pipe read failed"); 806 } 807 nsig = i / sizeof(signo); 808 dprintf("# of received signals = %d\n", nsig); 809 for (i = 0; i < nsig; i++) { 810 len = read(sigpipe[0], &signo, sizeof(signo)); 811 if (len != sizeof(signo)) { 812 logerror("signal pipe read failed"); 813 err(1, "signal pipe read failed"); 814 } 815 dprintf("Received signal: %d from fd=%d\n", signo, 816 sigpipe[0]); 817 switch (signo) { 818 case SIGHUP: 819 WantInitialize = 1; 820 break; 821 case SIGCHLD: 822 WantReapchild = 1; 823 break; 824 } 825 } 826 return (0); 827 } 828 829 static int 830 socklist_recv_sock(struct socklist *sl) 831 { 832 struct sockaddr_storage ss; 833 struct sockaddr *sa = (struct sockaddr *)&ss; 834 socklen_t sslen; 835 const char *hname; 836 char line[MAXLINE + 1]; 837 int len; 838 839 sslen = sizeof(ss); 840 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 841 dprintf("received sa_len = %d\n", sslen); 842 if (len == 0) 843 return (-1); 844 if (len < 0) { 845 if (errno != EINTR) 846 logerror("recvfrom"); 847 return (-1); 848 } 849 /* Received valid data. */ 850 line[len] = '\0'; 851 if (sl->sl_ss.ss_family == AF_LOCAL) 852 hname = LocalHostName; 853 else { 854 hname = cvthname(sa); 855 unmapped(sa); 856 if (validate(sa, hname) == 0) { 857 dprintf("Message from %s was ignored.", hname); 858 return (-1); 859 } 860 } 861 parsemsg(hname, line); 862 863 return (0); 864 } 865 866 static void 867 unmapped(struct sockaddr *sa) 868 { 869 #if defined(INET) && defined(INET6) 870 struct sockaddr_in6 *sin6; 871 struct sockaddr_in sin; 872 873 if (sa == NULL || 874 sa->sa_family != AF_INET6 || 875 sa->sa_len != sizeof(*sin6)) 876 return; 877 sin6 = satosin6(sa); 878 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 879 return; 880 sin = (struct sockaddr_in){ 881 .sin_family = AF_INET, 882 .sin_len = sizeof(sin), 883 .sin_port = sin6->sin6_port 884 }; 885 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 886 sizeof(sin.sin_addr)); 887 memcpy(sa, &sin, sizeof(sin)); 888 #else 889 if (sa == NULL) 890 return; 891 #endif 892 } 893 894 static void 895 usage(void) 896 { 897 898 fprintf(stderr, 899 "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]\n" 900 " [-b bind_address] [-f config_file]\n" 901 " [-l [mode:]path] [-m mark_interval]\n" 902 " [-O format] [-P pid_file] [-p log_socket]\n" 903 " [-S logpriv_socket]\n"); 904 exit(1); 905 } 906 907 /* 908 * Removes characters from log messages that are unsafe to display. 909 * TODO: Permit UTF-8 strings that include a BOM per RFC 5424? 910 */ 911 static void 912 parsemsg_remove_unsafe_characters(const char *in, char *out, size_t outlen) 913 { 914 char *q; 915 int c; 916 917 q = out; 918 while ((c = (unsigned char)*in++) != '\0' && q < out + outlen - 4) { 919 if (mask_C1 && (c & 0x80) && c < 0xA0) { 920 c &= 0x7F; 921 *q++ = 'M'; 922 *q++ = '-'; 923 } 924 if (isascii(c) && iscntrl(c)) { 925 if (c == '\n') { 926 *q++ = ' '; 927 } else if (c == '\t') { 928 *q++ = '\t'; 929 } else { 930 *q++ = '^'; 931 *q++ = c ^ 0100; 932 } 933 } else { 934 *q++ = c; 935 } 936 } 937 *q = '\0'; 938 } 939 940 /* 941 * Parses a syslog message according to RFC 5424, assuming that PRI and 942 * VERSION (i.e., "<%d>1 ") have already been parsed by parsemsg(). The 943 * parsed result is passed to logmsg(). 944 */ 945 static void 946 parsemsg_rfc5424(const char *from, int pri, char *msg) 947 { 948 const struct logtime *timestamp; 949 struct logtime timestamp_remote; 950 const char *omsg, *hostname, *app_name, *procid, *msgid, 951 *structured_data; 952 char line[MAXLINE + 1]; 953 954 #define FAIL_IF(field, expr) do { \ 955 if (expr) { \ 956 dprintf("Failed to parse " field " from %s: %s\n", \ 957 from, omsg); \ 958 return; \ 959 } \ 960 } while (0) 961 #define PARSE_CHAR(field, sep) do { \ 962 FAIL_IF(field, *msg != sep); \ 963 ++msg; \ 964 } while (0) 965 #define IF_NOT_NILVALUE(var) \ 966 if (msg[0] == '-' && msg[1] == ' ') { \ 967 msg += 2; \ 968 var = NULL; \ 969 } else if (msg[0] == '-' && msg[1] == '\0') { \ 970 ++msg; \ 971 var = NULL; \ 972 } else 973 974 omsg = msg; 975 IF_NOT_NILVALUE(timestamp) { 976 /* Parse RFC 3339-like timestamp. */ 977 #define PARSE_NUMBER(dest, length, min, max) do { \ 978 int i, v; \ 979 \ 980 v = 0; \ 981 for (i = 0; i < length; ++i) { \ 982 FAIL_IF("TIMESTAMP", *msg < '0' || *msg > '9'); \ 983 v = v * 10 + *msg++ - '0'; \ 984 } \ 985 FAIL_IF("TIMESTAMP", v < min || v > max); \ 986 dest = v; \ 987 } while (0) 988 /* Date and time. */ 989 memset(×tamp_remote, 0, sizeof(timestamp_remote)); 990 PARSE_NUMBER(timestamp_remote.tm.tm_year, 4, 0, 9999); 991 timestamp_remote.tm.tm_year -= 1900; 992 PARSE_CHAR("TIMESTAMP", '-'); 993 PARSE_NUMBER(timestamp_remote.tm.tm_mon, 2, 1, 12); 994 --timestamp_remote.tm.tm_mon; 995 PARSE_CHAR("TIMESTAMP", '-'); 996 PARSE_NUMBER(timestamp_remote.tm.tm_mday, 2, 1, 31); 997 PARSE_CHAR("TIMESTAMP", 'T'); 998 PARSE_NUMBER(timestamp_remote.tm.tm_hour, 2, 0, 23); 999 PARSE_CHAR("TIMESTAMP", ':'); 1000 PARSE_NUMBER(timestamp_remote.tm.tm_min, 2, 0, 59); 1001 PARSE_CHAR("TIMESTAMP", ':'); 1002 PARSE_NUMBER(timestamp_remote.tm.tm_sec, 2, 0, 59); 1003 /* Perform normalization. */ 1004 timegm(×tamp_remote.tm); 1005 /* Optional: fractional seconds. */ 1006 if (msg[0] == '.' && msg[1] >= '0' && msg[1] <= '9') { 1007 int i; 1008 1009 ++msg; 1010 for (i = 100000; i != 0; i /= 10) { 1011 if (*msg < '0' || *msg > '9') 1012 break; 1013 timestamp_remote.usec += (*msg++ - '0') * i; 1014 } 1015 } 1016 /* Timezone. */ 1017 if (*msg == 'Z') { 1018 /* UTC. */ 1019 ++msg; 1020 } else { 1021 int sign, tz_hour, tz_min; 1022 1023 /* Local time zone offset. */ 1024 FAIL_IF("TIMESTAMP", *msg != '-' && *msg != '+'); 1025 sign = *msg++ == '-' ? -1 : 1; 1026 PARSE_NUMBER(tz_hour, 2, 0, 23); 1027 PARSE_CHAR("TIMESTAMP", ':'); 1028 PARSE_NUMBER(tz_min, 2, 0, 59); 1029 timestamp_remote.tm.tm_gmtoff = 1030 sign * (tz_hour * 3600 + tz_min * 60); 1031 } 1032 #undef PARSE_NUMBER 1033 PARSE_CHAR("TIMESTAMP", ' '); 1034 timestamp = RemoteAddDate ? NULL : ×tamp_remote; 1035 } 1036 1037 /* String fields part of the HEADER. */ 1038 #define PARSE_STRING(field, var) \ 1039 IF_NOT_NILVALUE(var) { \ 1040 var = msg; \ 1041 while (*msg >= '!' && *msg <= '~') \ 1042 ++msg; \ 1043 FAIL_IF(field, var == msg); \ 1044 PARSE_CHAR(field, ' '); \ 1045 msg[-1] = '\0'; \ 1046 } 1047 PARSE_STRING("HOSTNAME", hostname); 1048 if (hostname == NULL || !RemoteHostname) 1049 hostname = from; 1050 PARSE_STRING("APP-NAME", app_name); 1051 PARSE_STRING("PROCID", procid); 1052 PARSE_STRING("MSGID", msgid); 1053 #undef PARSE_STRING 1054 1055 /* Structured data. */ 1056 #define PARSE_SD_NAME() do { \ 1057 const char *start; \ 1058 \ 1059 start = msg; \ 1060 while (*msg >= '!' && *msg <= '~' && *msg != '=' && \ 1061 *msg != ']' && *msg != '"') \ 1062 ++msg; \ 1063 FAIL_IF("STRUCTURED-NAME", start == msg); \ 1064 } while (0) 1065 IF_NOT_NILVALUE(structured_data) { 1066 /* SD-ELEMENT. */ 1067 while (*msg == '[') { 1068 ++msg; 1069 /* SD-ID. */ 1070 PARSE_SD_NAME(); 1071 /* SD-PARAM. */ 1072 while (*msg == ' ') { 1073 ++msg; 1074 /* PARAM-NAME. */ 1075 PARSE_SD_NAME(); 1076 PARSE_CHAR("STRUCTURED-NAME", '='); 1077 PARSE_CHAR("STRUCTURED-NAME", '"'); 1078 while (*msg != '"') { 1079 FAIL_IF("STRUCTURED-NAME", 1080 *msg == '\0'); 1081 if (*msg++ == '\\') { 1082 FAIL_IF("STRUCTURED-NAME", 1083 *msg == '\0'); 1084 ++msg; 1085 } 1086 } 1087 ++msg; 1088 } 1089 PARSE_CHAR("STRUCTURED-NAME", ']'); 1090 } 1091 PARSE_CHAR("STRUCTURED-NAME", ' '); 1092 msg[-1] = '\0'; 1093 } 1094 #undef PARSE_SD_NAME 1095 1096 #undef FAIL_IF 1097 #undef PARSE_CHAR 1098 #undef IF_NOT_NILVALUE 1099 1100 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1101 logmsg(pri, timestamp, hostname, app_name, procid, msgid, 1102 structured_data, line, 0); 1103 } 1104 1105 /* 1106 * Trims the application name ("TAG" in RFC 3164 terminology) and 1107 * process ID from a message if present. 1108 */ 1109 static void 1110 parsemsg_rfc3164_app_name_procid(char **msg, const char **app_name, 1111 const char **procid) { 1112 char *m, *app_name_begin, *procid_begin; 1113 size_t app_name_length, procid_length; 1114 1115 m = *msg; 1116 1117 /* Application name. */ 1118 app_name_begin = m; 1119 app_name_length = strspn(m, 1120 "abcdefghijklmnopqrstuvwxyz" 1121 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 1122 "0123456789" 1123 "_-/"); 1124 if (app_name_length == 0) 1125 goto bad; 1126 m += app_name_length; 1127 1128 /* Process identifier (optional). */ 1129 if (*m == '[') { 1130 procid_begin = ++m; 1131 procid_length = strspn(m, "0123456789"); 1132 if (procid_length == 0) 1133 goto bad; 1134 m += procid_length; 1135 if (*m++ != ']') 1136 goto bad; 1137 } else { 1138 procid_begin = NULL; 1139 procid_length = 0; 1140 } 1141 1142 /* Separator. */ 1143 if (m[0] != ':' || m[1] != ' ') 1144 goto bad; 1145 1146 /* Split strings from input. */ 1147 app_name_begin[app_name_length] = '\0'; 1148 if (procid_begin != 0) 1149 procid_begin[procid_length] = '\0'; 1150 1151 *msg = m + 2; 1152 *app_name = app_name_begin; 1153 *procid = procid_begin; 1154 return; 1155 bad: 1156 *app_name = NULL; 1157 *procid = NULL; 1158 } 1159 1160 /* 1161 * Parses a syslog message according to RFC 3164, assuming that PRI 1162 * (i.e., "<%d>") has already been parsed by parsemsg(). The parsed 1163 * result is passed to logmsg(). 1164 */ 1165 static void 1166 parsemsg_rfc3164(const char *from, int pri, char *msg) 1167 { 1168 struct tm tm_parsed; 1169 const struct logtime *timestamp; 1170 struct logtime timestamp_remote; 1171 const char *app_name, *procid; 1172 size_t i, msglen; 1173 char line[MAXLINE + 1]; 1174 1175 /* 1176 * Parse the TIMESTAMP provided by the remote side. If none is 1177 * found, assume this is not an RFC 3164 formatted message, 1178 * only containing a TAG and a MSG. 1179 */ 1180 timestamp = NULL; 1181 if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) == 1182 msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') { 1183 msg += RFC3164_DATELEN + 1; 1184 if (!RemoteAddDate) { 1185 struct tm tm_now; 1186 time_t t_now; 1187 int year; 1188 1189 /* 1190 * As the timestamp does not contain the year 1191 * number, daylight saving time information, nor 1192 * a time zone, attempt to infer it. Due to 1193 * clock skews, the timestamp may even be part 1194 * of the next year. Use the last year for which 1195 * the timestamp is at most one week in the 1196 * future. 1197 * 1198 * This loop can only run for at most three 1199 * iterations before terminating. 1200 */ 1201 t_now = time(NULL); 1202 localtime_r(&t_now, &tm_now); 1203 for (year = tm_now.tm_year + 1;; --year) { 1204 assert(year >= tm_now.tm_year - 1); 1205 timestamp_remote.tm = tm_parsed; 1206 timestamp_remote.tm.tm_year = year; 1207 timestamp_remote.tm.tm_isdst = -1; 1208 timestamp_remote.usec = 0; 1209 if (mktime(×tamp_remote.tm) < 1210 t_now + 7 * 24 * 60 * 60) 1211 break; 1212 } 1213 timestamp = ×tamp_remote; 1214 } 1215 1216 /* 1217 * A single space character MUST also follow the HOSTNAME field. 1218 */ 1219 msglen = strlen(msg); 1220 for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) { 1221 if (msg[i] == ' ') { 1222 if (RemoteHostname) { 1223 msg[i] = '\0'; 1224 from = msg; 1225 } 1226 msg += i + 1; 1227 break; 1228 } 1229 /* 1230 * Support non RFC compliant messages, without hostname. 1231 */ 1232 if (msg[i] == ':') 1233 break; 1234 } 1235 if (i == MIN(MAXHOSTNAMELEN, msglen)) { 1236 dprintf("Invalid HOSTNAME from %s: %s\n", from, msg); 1237 return; 1238 } 1239 } 1240 1241 /* Remove the TAG, if present. */ 1242 parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid); 1243 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1244 logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0); 1245 } 1246 1247 /* 1248 * Takes a raw input line, extracts PRI and determines whether the 1249 * message is formatted according to RFC 3164 or RFC 5424. Continues 1250 * parsing of addition fields in the message according to those 1251 * standards and prints the message on the appropriate log files. 1252 */ 1253 static void 1254 parsemsg(const char *from, char *msg) 1255 { 1256 char *q; 1257 long n; 1258 size_t i; 1259 int pri; 1260 1261 /* Parse PRI. */ 1262 if (msg[0] != '<' || !isdigit(msg[1])) { 1263 dprintf("Invalid PRI from %s\n", from); 1264 return; 1265 } 1266 for (i = 2; i <= 4; i++) { 1267 if (msg[i] == '>') 1268 break; 1269 if (!isdigit(msg[i])) { 1270 dprintf("Invalid PRI header from %s\n", from); 1271 return; 1272 } 1273 } 1274 if (msg[i] != '>') { 1275 dprintf("Invalid PRI header from %s\n", from); 1276 return; 1277 } 1278 errno = 0; 1279 n = strtol(msg + 1, &q, 10); 1280 if (errno != 0 || *q != msg[i] || n < 0 || n >= INT_MAX) { 1281 dprintf("Invalid PRI %ld from %s: %s\n", 1282 n, from, strerror(errno)); 1283 return; 1284 } 1285 pri = n; 1286 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1287 pri = DEFUPRI; 1288 1289 /* 1290 * Don't allow users to log kernel messages. 1291 * NOTE: since LOG_KERN == 0 this will also match 1292 * messages with no facility specified. 1293 */ 1294 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 1295 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 1296 1297 /* Parse VERSION. */ 1298 msg += i + 1; 1299 if (msg[0] == '1' && msg[1] == ' ') 1300 parsemsg_rfc5424(from, pri, msg + 2); 1301 else 1302 parsemsg_rfc3164(from, pri, msg); 1303 } 1304 1305 /* 1306 * Read /dev/klog while data are available, split into lines. 1307 */ 1308 static int 1309 socklist_recv_file(struct socklist *sl) 1310 { 1311 char *p, *q, line[MAXLINE + 1]; 1312 int len, i; 1313 1314 len = 0; 1315 for (;;) { 1316 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 1317 if (i > 0) { 1318 line[i + len] = '\0'; 1319 } else { 1320 if (i < 0 && errno != EINTR && errno != EAGAIN) { 1321 logerror("klog"); 1322 close(sl->sl_socket); 1323 sl->sl_socket = -1; 1324 } 1325 break; 1326 } 1327 1328 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 1329 *q = '\0'; 1330 printsys(p); 1331 } 1332 len = strlen(p); 1333 if (len >= MAXLINE - 1) { 1334 printsys(p); 1335 len = 0; 1336 } 1337 if (len > 0) 1338 memmove(line, p, len + 1); 1339 } 1340 if (len > 0) 1341 printsys(line); 1342 1343 return (len); 1344 } 1345 1346 /* 1347 * Take a raw input line from /dev/klog, format similar to syslog(). 1348 */ 1349 static void 1350 printsys(char *msg) 1351 { 1352 char *p, *q; 1353 long n; 1354 int flags, isprintf, pri; 1355 1356 flags = SYNC_FILE; /* fsync after write */ 1357 p = msg; 1358 pri = DEFSPRI; 1359 isprintf = 1; 1360 if (*p == '<') { 1361 errno = 0; 1362 n = strtol(p + 1, &q, 10); 1363 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 1364 p = q + 1; 1365 pri = n; 1366 isprintf = 0; 1367 } 1368 } 1369 /* 1370 * Kernel printf's and LOG_CONSOLE messages have been displayed 1371 * on the console already. 1372 */ 1373 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 1374 flags |= IGN_CONS; 1375 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1376 pri = DEFSPRI; 1377 logmsg(pri, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, flags); 1378 } 1379 1380 static time_t now; 1381 1382 /* 1383 * Match a program or host name against a specification. 1384 * Return a non-0 value if the message must be ignored 1385 * based on the specification. 1386 */ 1387 static int 1388 skip_message(const char *name, const char *spec, int checkcase) 1389 { 1390 const char *s; 1391 char prev, next; 1392 int exclude = 0; 1393 /* Behaviour on explicit match */ 1394 1395 if (spec == NULL) 1396 return 0; 1397 switch (*spec) { 1398 case '-': 1399 exclude = 1; 1400 /*FALLTHROUGH*/ 1401 case '+': 1402 spec++; 1403 break; 1404 default: 1405 break; 1406 } 1407 if (checkcase) 1408 s = strstr (spec, name); 1409 else 1410 s = strcasestr (spec, name); 1411 1412 if (s != NULL) { 1413 prev = (s == spec ? ',' : *(s - 1)); 1414 next = *(s + strlen (name)); 1415 1416 if (prev == ',' && (next == '\0' || next == ',')) 1417 /* Explicit match: skip iff the spec is an 1418 exclusive one. */ 1419 return exclude; 1420 } 1421 1422 /* No explicit match for this name: skip the message iff 1423 the spec is an inclusive one. */ 1424 return !exclude; 1425 } 1426 1427 /* 1428 * Logs a message to the appropriate log files, users, etc. based on the 1429 * priority. Log messages are always formatted according to RFC 3164, 1430 * even if they were in RFC 5424 format originally, The MSGID and 1431 * STRUCTURED-DATA fields are thus discarded for the time being. 1432 */ 1433 static void 1434 logmsg(int pri, const struct logtime *timestamp, const char *hostname, 1435 const char *app_name, const char *procid, const char *msgid, 1436 const char *structured_data, const char *msg, int flags) 1437 { 1438 struct timeval tv; 1439 struct logtime timestamp_now; 1440 struct filed *f; 1441 size_t savedlen; 1442 int fac, prilev; 1443 char saved[MAXSVLINE]; 1444 1445 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1446 pri, flags, hostname, msg); 1447 1448 (void)gettimeofday(&tv, NULL); 1449 now = tv.tv_sec; 1450 if (timestamp == NULL) { 1451 localtime_r(&now, ×tamp_now.tm); 1452 timestamp_now.usec = tv.tv_usec; 1453 timestamp = ×tamp_now; 1454 } 1455 1456 /* extract facility and priority level */ 1457 if (flags & MARK) 1458 fac = LOG_NFACILITIES; 1459 else 1460 fac = LOG_FAC(pri); 1461 1462 /* Check maximum facility number. */ 1463 if (fac > LOG_NFACILITIES) 1464 return; 1465 1466 prilev = LOG_PRI(pri); 1467 1468 /* log the message to the particular outputs */ 1469 if (!Initialized) { 1470 f = &consfile; 1471 /* 1472 * Open in non-blocking mode to avoid hangs during open 1473 * and close(waiting for the port to drain). 1474 */ 1475 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1476 1477 if (f->f_file >= 0) { 1478 f->f_lasttime = *timestamp; 1479 fprintlog_first(f, hostname, app_name, procid, msgid, 1480 structured_data, msg, flags); 1481 close(f->f_file); 1482 f->f_file = -1; 1483 } 1484 return; 1485 } 1486 1487 /* 1488 * Store all of the fields of the message, except the timestamp, 1489 * in a single string. This string is used to detect duplicate 1490 * messages. 1491 */ 1492 assert(hostname != NULL); 1493 assert(msg != NULL); 1494 savedlen = snprintf(saved, sizeof(saved), 1495 "%d %s %s %s %s %s %s", pri, hostname, 1496 app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid, 1497 msgid == NULL ? "-" : msgid, 1498 structured_data == NULL ? "-" : structured_data, msg); 1499 1500 STAILQ_FOREACH(f, &fhead, next) { 1501 /* skip messages that are incorrect priority */ 1502 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1503 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1504 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1505 ) 1506 || f->f_pmask[fac] == INTERNAL_NOPRI) 1507 continue; 1508 1509 /* skip messages with the incorrect hostname */ 1510 if (skip_message(hostname, f->f_host, 0)) 1511 continue; 1512 1513 /* skip messages with the incorrect program name */ 1514 if (skip_message(app_name == NULL ? "" : app_name, 1515 f->f_program, 1)) 1516 continue; 1517 1518 /* skip message to console if it has already been printed */ 1519 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1520 continue; 1521 1522 /* don't output marks to recently written files */ 1523 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1524 continue; 1525 1526 /* 1527 * suppress duplicate lines to this file 1528 */ 1529 if (no_compress - (f->f_type != F_PIPE) < 1 && 1530 (flags & MARK) == 0 && savedlen == f->f_prevlen && 1531 strcmp(saved, f->f_prevline) == 0) { 1532 f->f_lasttime = *timestamp; 1533 f->f_prevcount++; 1534 dprintf("msg repeated %d times, %ld sec of %d\n", 1535 f->f_prevcount, (long)(now - f->f_time), 1536 repeatinterval[f->f_repeatcount]); 1537 /* 1538 * If domark would have logged this by now, 1539 * flush it now (so we don't hold isolated messages), 1540 * but back off so we'll flush less often 1541 * in the future. 1542 */ 1543 if (now > REPEATTIME(f)) { 1544 fprintlog_successive(f, flags); 1545 BACKOFF(f); 1546 } 1547 } else { 1548 /* new line, save it */ 1549 if (f->f_prevcount) 1550 fprintlog_successive(f, 0); 1551 f->f_repeatcount = 0; 1552 f->f_prevpri = pri; 1553 f->f_lasttime = *timestamp; 1554 static_assert(sizeof(f->f_prevline) == sizeof(saved), 1555 "Space to store saved line incorrect"); 1556 (void)strcpy(f->f_prevline, saved); 1557 f->f_prevlen = savedlen; 1558 fprintlog_first(f, hostname, app_name, procid, msgid, 1559 structured_data, msg, flags); 1560 } 1561 } 1562 } 1563 1564 static void 1565 dofsync(void) 1566 { 1567 struct filed *f; 1568 1569 STAILQ_FOREACH(f, &fhead, next) { 1570 if ((f->f_type == F_FILE) && 1571 (f->f_flags & FFLAG_NEEDSYNC)) { 1572 f->f_flags &= ~FFLAG_NEEDSYNC; 1573 (void)fsync(f->f_file); 1574 } 1575 } 1576 } 1577 1578 /* 1579 * List of iovecs to which entries can be appended. 1580 * Used for constructing the message to be logged. 1581 */ 1582 struct iovlist { 1583 struct iovec iov[TTYMSG_IOV_MAX]; 1584 size_t iovcnt; 1585 size_t totalsize; 1586 }; 1587 1588 static void 1589 iovlist_init(struct iovlist *il) 1590 { 1591 1592 il->iovcnt = 0; 1593 il->totalsize = 0; 1594 } 1595 1596 static void 1597 iovlist_append(struct iovlist *il, const char *str) 1598 { 1599 size_t size; 1600 1601 /* Discard components if we've run out of iovecs. */ 1602 if (il->iovcnt < nitems(il->iov)) { 1603 size = strlen(str); 1604 il->iov[il->iovcnt++] = (struct iovec){ 1605 .iov_base = __DECONST(char *, str), 1606 .iov_len = size, 1607 }; 1608 il->totalsize += size; 1609 } 1610 } 1611 1612 static void 1613 iovlist_truncate(struct iovlist *il, size_t size) 1614 { 1615 struct iovec *last; 1616 size_t diff; 1617 1618 while (il->totalsize > size) { 1619 diff = il->totalsize - size; 1620 last = &il->iov[il->iovcnt - 1]; 1621 if (diff >= last->iov_len) { 1622 /* Remove the last iovec entirely. */ 1623 --il->iovcnt; 1624 il->totalsize -= last->iov_len; 1625 } else { 1626 /* Remove the last iovec partially. */ 1627 last->iov_len -= diff; 1628 il->totalsize -= diff; 1629 } 1630 } 1631 } 1632 1633 static void 1634 fprintlog_write(struct filed *f, struct iovlist *il, int flags) 1635 { 1636 struct msghdr msghdr; 1637 struct addrinfo *r; 1638 struct socklist *sl; 1639 const char *msgret; 1640 ssize_t lsent; 1641 1642 switch (f->f_type) { 1643 case F_FORW: 1644 /* Truncate messages to RFC 5426 recommended size. */ 1645 dprintf(" %s", f->fu_forw_hname); 1646 switch (f->fu_forw_addr->ai_addr->sa_family) { 1647 #ifdef INET 1648 case AF_INET: 1649 dprintf(":%d\n", 1650 ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); 1651 iovlist_truncate(il, 480); 1652 break; 1653 #endif 1654 #ifdef INET6 1655 case AF_INET6: 1656 dprintf(":%d\n", 1657 ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); 1658 iovlist_truncate(il, 1180); 1659 break; 1660 #endif 1661 default: 1662 dprintf("\n"); 1663 } 1664 1665 lsent = 0; 1666 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1667 memset(&msghdr, 0, sizeof(msghdr)); 1668 msghdr.msg_name = r->ai_addr; 1669 msghdr.msg_namelen = r->ai_addrlen; 1670 msghdr.msg_iov = il->iov; 1671 msghdr.msg_iovlen = il->iovcnt; 1672 STAILQ_FOREACH(sl, &shead, next) { 1673 if (sl->sl_ss.ss_family == AF_LOCAL || 1674 sl->sl_ss.ss_family == AF_UNSPEC || 1675 sl->sl_socket < 0) 1676 continue; 1677 lsent = sendmsg(sl->sl_socket, &msghdr, 0); 1678 if (lsent == (ssize_t)il->totalsize) 1679 break; 1680 } 1681 if (lsent == (ssize_t)il->totalsize && !send_to_all) 1682 break; 1683 } 1684 dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize); 1685 if (lsent != (ssize_t)il->totalsize) { 1686 int e = errno; 1687 logerror("sendto"); 1688 errno = e; 1689 switch (errno) { 1690 case ENOBUFS: 1691 case ENETDOWN: 1692 case ENETUNREACH: 1693 case EHOSTUNREACH: 1694 case EHOSTDOWN: 1695 case EADDRNOTAVAIL: 1696 break; 1697 /* case EBADF: */ 1698 /* case EACCES: */ 1699 /* case ENOTSOCK: */ 1700 /* case EFAULT: */ 1701 /* case EMSGSIZE: */ 1702 /* case EAGAIN: */ 1703 /* case ENOBUFS: */ 1704 /* case ECONNREFUSED: */ 1705 default: 1706 dprintf("removing entry: errno=%d\n", e); 1707 f->f_type = F_UNUSED; 1708 break; 1709 } 1710 } 1711 break; 1712 1713 case F_FILE: 1714 dprintf(" %s\n", f->fu_fname); 1715 iovlist_append(il, "\n"); 1716 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1717 /* 1718 * If writev(2) fails for potentially transient errors 1719 * like the filesystem being full, ignore it. 1720 * Otherwise remove this logfile from the list. 1721 */ 1722 if (errno != ENOSPC) { 1723 int e = errno; 1724 close_filed(f); 1725 errno = e; 1726 logerror(f->fu_fname); 1727 } 1728 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1729 f->f_flags |= FFLAG_NEEDSYNC; 1730 needdofsync = 1; 1731 } 1732 break; 1733 1734 case F_PIPE: 1735 dprintf(" %s\n", f->fu_pipe_pname); 1736 iovlist_append(il, "\n"); 1737 if (f->fu_pipe_pid == 0) { 1738 if ((f->f_file = p_open(f->fu_pipe_pname, 1739 &f->fu_pipe_pid)) < 0) { 1740 logerror(f->fu_pipe_pname); 1741 break; 1742 } 1743 } 1744 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1745 int e = errno; 1746 1747 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1748 close_filed(f); 1749 errno = e; 1750 logerror(f->fu_pipe_pname); 1751 } 1752 break; 1753 1754 case F_CONSOLE: 1755 if (flags & IGN_CONS) { 1756 dprintf(" (ignored)\n"); 1757 break; 1758 } 1759 /* FALLTHROUGH */ 1760 1761 case F_TTY: 1762 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1763 iovlist_append(il, "\r\n"); 1764 errno = 0; /* ttymsg() only sometimes returns an errno */ 1765 if ((msgret = ttymsg(il->iov, il->iovcnt, f->fu_fname, 10))) { 1766 f->f_type = F_UNUSED; 1767 logerror(msgret); 1768 } 1769 break; 1770 1771 case F_USERS: 1772 case F_WALL: 1773 dprintf("\n"); 1774 iovlist_append(il, "\r\n"); 1775 wallmsg(f, il->iov, il->iovcnt); 1776 break; 1777 } 1778 } 1779 1780 static void 1781 fprintlog_rfc5424(struct filed *f, const char *hostname, const char *app_name, 1782 const char *procid, const char *msgid, const char *structured_data, 1783 const char *msg, int flags) 1784 { 1785 struct iovlist il; 1786 suseconds_t usec; 1787 int i; 1788 char timebuf[33], priority_number[5]; 1789 1790 iovlist_init(&il); 1791 if (f->f_type == F_WALL) 1792 iovlist_append(&il, "\r\n\aMessage from syslogd ...\r\n"); 1793 iovlist_append(&il, "<"); 1794 snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri); 1795 iovlist_append(&il, priority_number); 1796 iovlist_append(&il, ">1 "); 1797 if (strftime(timebuf, sizeof(timebuf), "%FT%T.______%z", 1798 &f->f_lasttime.tm) == sizeof(timebuf) - 2) { 1799 /* Add colon to the time zone offset, which %z doesn't do. */ 1800 timebuf[32] = '\0'; 1801 timebuf[31] = timebuf[30]; 1802 timebuf[30] = timebuf[29]; 1803 timebuf[29] = ':'; 1804 1805 /* Overwrite space for microseconds with actual value. */ 1806 usec = f->f_lasttime.usec; 1807 for (i = 25; i >= 20; --i) { 1808 timebuf[i] = usec % 10 + '0'; 1809 usec /= 10; 1810 } 1811 iovlist_append(&il, timebuf); 1812 } else 1813 iovlist_append(&il, "-"); 1814 iovlist_append(&il, " "); 1815 iovlist_append(&il, hostname); 1816 iovlist_append(&il, " "); 1817 iovlist_append(&il, app_name == NULL ? "-" : app_name); 1818 iovlist_append(&il, " "); 1819 iovlist_append(&il, procid == NULL ? "-" : procid); 1820 iovlist_append(&il, " "); 1821 iovlist_append(&il, msgid == NULL ? "-" : msgid); 1822 iovlist_append(&il, " "); 1823 iovlist_append(&il, structured_data == NULL ? "-" : structured_data); 1824 iovlist_append(&il, " "); 1825 iovlist_append(&il, msg); 1826 1827 fprintlog_write(f, &il, flags); 1828 } 1829 1830 static void 1831 fprintlog_rfc3164(struct filed *f, const char *hostname, const char *app_name, 1832 const char *procid, const char *msg, int flags) 1833 { 1834 struct iovlist il; 1835 const CODE *c; 1836 int facility, priority; 1837 char timebuf[RFC3164_DATELEN + 1], facility_number[5], 1838 priority_number[5]; 1839 bool facility_found, priority_found; 1840 1841 if (strftime(timebuf, sizeof(timebuf), RFC3164_DATEFMT, 1842 &f->f_lasttime.tm) == 0) 1843 timebuf[0] = '\0'; 1844 1845 iovlist_init(&il); 1846 switch (f->f_type) { 1847 case F_FORW: 1848 /* Message forwarded over the network. */ 1849 iovlist_append(&il, "<"); 1850 snprintf(priority_number, sizeof(priority_number), "%d", 1851 f->f_prevpri); 1852 iovlist_append(&il, priority_number); 1853 iovlist_append(&il, ">"); 1854 iovlist_append(&il, timebuf); 1855 if (strcasecmp(hostname, LocalHostName) != 0) { 1856 iovlist_append(&il, " Forwarded from "); 1857 iovlist_append(&il, hostname); 1858 iovlist_append(&il, ":"); 1859 } 1860 iovlist_append(&il, " "); 1861 break; 1862 1863 case F_WALL: 1864 /* Message written to terminals. */ 1865 iovlist_append(&il, "\r\n\aMessage from syslogd@"); 1866 iovlist_append(&il, hostname); 1867 iovlist_append(&il, " at "); 1868 iovlist_append(&il, timebuf); 1869 iovlist_append(&il, " ...\r\n"); 1870 break; 1871 1872 default: 1873 /* Message written to files. */ 1874 iovlist_append(&il, timebuf); 1875 iovlist_append(&il, " "); 1876 1877 if (LogFacPri) { 1878 iovlist_append(&il, "<"); 1879 1880 facility = f->f_prevpri & LOG_FACMASK; 1881 facility_found = false; 1882 if (LogFacPri > 1) { 1883 for (c = facilitynames; c->c_name; c++) { 1884 if (c->c_val == facility) { 1885 iovlist_append(&il, c->c_name); 1886 facility_found = true; 1887 break; 1888 } 1889 } 1890 } 1891 if (!facility_found) { 1892 snprintf(facility_number, 1893 sizeof(facility_number), "%d", 1894 LOG_FAC(facility)); 1895 iovlist_append(&il, facility_number); 1896 } 1897 1898 iovlist_append(&il, "."); 1899 1900 priority = LOG_PRI(f->f_prevpri); 1901 priority_found = false; 1902 if (LogFacPri > 1) { 1903 for (c = prioritynames; c->c_name; c++) { 1904 if (c->c_val == priority) { 1905 iovlist_append(&il, c->c_name); 1906 priority_found = true; 1907 break; 1908 } 1909 } 1910 } 1911 if (!priority_found) { 1912 snprintf(priority_number, 1913 sizeof(priority_number), "%d", priority); 1914 iovlist_append(&il, priority_number); 1915 } 1916 1917 iovlist_append(&il, "> "); 1918 } 1919 1920 iovlist_append(&il, hostname); 1921 iovlist_append(&il, " "); 1922 break; 1923 } 1924 1925 /* Message body with application name and process ID prefixed. */ 1926 if (app_name != NULL) { 1927 iovlist_append(&il, app_name); 1928 if (procid != NULL) { 1929 iovlist_append(&il, "["); 1930 iovlist_append(&il, procid); 1931 iovlist_append(&il, "]"); 1932 } 1933 iovlist_append(&il, ": "); 1934 } 1935 iovlist_append(&il, msg); 1936 1937 fprintlog_write(f, &il, flags); 1938 } 1939 1940 static void 1941 fprintlog_first(struct filed *f, const char *hostname, const char *app_name, 1942 const char *procid, const char *msgid __unused, 1943 const char *structured_data __unused, const char *msg, int flags) 1944 { 1945 1946 dprintf("Logging to %s", TypeNames[f->f_type]); 1947 f->f_time = now; 1948 f->f_prevcount = 0; 1949 if (f->f_type == F_UNUSED) { 1950 dprintf("\n"); 1951 return; 1952 } 1953 1954 if (RFC3164OutputFormat) 1955 fprintlog_rfc3164(f, hostname, app_name, procid, msg, flags); 1956 else 1957 fprintlog_rfc5424(f, hostname, app_name, procid, msgid, 1958 structured_data, msg, flags); 1959 } 1960 1961 /* 1962 * Prints a message to a log file that the previously logged message was 1963 * received multiple times. 1964 */ 1965 static void 1966 fprintlog_successive(struct filed *f, int flags) 1967 { 1968 char msg[100]; 1969 1970 assert(f->f_prevcount > 0); 1971 snprintf(msg, sizeof(msg), "last message repeated %d times", 1972 f->f_prevcount); 1973 fprintlog_first(f, LocalHostName, "syslogd", NULL, NULL, NULL, msg, 1974 flags); 1975 } 1976 1977 /* 1978 * WALLMSG -- Write a message to the world at large 1979 * 1980 * Write the specified message to either the entire 1981 * world, or a list of approved users. 1982 */ 1983 static void 1984 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1985 { 1986 static int reenter; /* avoid calling ourselves */ 1987 struct utmpx *ut; 1988 int i; 1989 const char *p; 1990 1991 if (reenter++) 1992 return; 1993 setutxent(); 1994 /* NOSTRICT */ 1995 while ((ut = getutxent()) != NULL) { 1996 if (ut->ut_type != USER_PROCESS) 1997 continue; 1998 if (f->f_type == F_WALL) { 1999 if ((p = ttymsg(iov, iovlen, ut->ut_line, 2000 TTYMSGTIME)) != NULL) { 2001 errno = 0; /* already in msg */ 2002 logerror(p); 2003 } 2004 continue; 2005 } 2006 /* should we send the message to this user? */ 2007 for (i = 0; i < MAXUNAMES; i++) { 2008 if (!f->fu_uname[i][0]) 2009 break; 2010 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 2011 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 2012 TTYMSGTIME)) != NULL) { 2013 errno = 0; /* already in msg */ 2014 logerror(p); 2015 } 2016 break; 2017 } 2018 } 2019 } 2020 endutxent(); 2021 reenter = 0; 2022 } 2023 2024 /* 2025 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 2026 */ 2027 static const char * 2028 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 2029 { 2030 static char device[1024]; 2031 static char errbuf[1024]; 2032 struct stat sb; 2033 2034 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 2035 2036 if (stat(device, &sb) < 0) { 2037 (void) snprintf(errbuf, sizeof(errbuf), 2038 "%s: %s", device, strerror(errno)); 2039 return (errbuf); 2040 } 2041 if ((sb.st_mode & S_IWGRP) == 0) 2042 /* Messages disabled. */ 2043 return (NULL); 2044 return ttymsg(iov, iovcnt, line, tmout); 2045 } 2046 2047 static void 2048 reapchild(int signo __unused) 2049 { 2050 int status; 2051 pid_t pid; 2052 struct filed *f; 2053 2054 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 2055 /* First, look if it's a process from the dead queue. */ 2056 if (deadq_removebypid(pid)) 2057 continue; 2058 2059 /* Now, look in list of active processes. */ 2060 STAILQ_FOREACH(f, &fhead, next) { 2061 if (f->f_type == F_PIPE && 2062 f->fu_pipe_pid == pid) { 2063 close_filed(f); 2064 log_deadchild(pid, status, f->fu_pipe_pname); 2065 break; 2066 } 2067 } 2068 } 2069 WantReapchild = 0; 2070 } 2071 2072 /* 2073 * Return a printable representation of a host address. 2074 */ 2075 static const char * 2076 cvthname(struct sockaddr *f) 2077 { 2078 int error, hl; 2079 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 2080 2081 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 2082 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 2083 NI_NUMERICHOST); 2084 if (error) { 2085 dprintf("Malformed from address %s\n", gai_strerror(error)); 2086 return ("???"); 2087 } 2088 dprintf("cvthname(%s)\n", ip); 2089 2090 if (!resolve) 2091 return (ip); 2092 2093 error = getnameinfo(f, f->sa_len, hname, sizeof(hname), 2094 NULL, 0, NI_NAMEREQD); 2095 if (error) { 2096 dprintf("Host name for your address (%s) unknown\n", ip); 2097 return (ip); 2098 } 2099 hl = strlen(hname); 2100 if (hl > 0 && hname[hl-1] == '.') 2101 hname[--hl] = '\0'; 2102 trimdomain(hname, hl); 2103 return (hname); 2104 } 2105 2106 static void 2107 dodie(int signo) 2108 { 2109 2110 WantDie = signo; 2111 } 2112 2113 static void 2114 domark(int signo __unused) 2115 { 2116 2117 MarkSet = 1; 2118 } 2119 2120 /* 2121 * Print syslogd errors some place. 2122 */ 2123 static void 2124 logerror(const char *msg) 2125 { 2126 char buf[512]; 2127 static int recursed = 0; 2128 2129 /* If there's an error while trying to log an error, give up. */ 2130 if (recursed) 2131 return; 2132 recursed++; 2133 if (errno != 0) { 2134 (void)snprintf(buf, sizeof(buf), "%s: %s", msg, 2135 strerror(errno)); 2136 msg = buf; 2137 } 2138 errno = 0; 2139 dprintf("%s\n", buf); 2140 logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL, 2141 NULL, msg, 0); 2142 recursed--; 2143 } 2144 2145 static void 2146 die(int signo) 2147 { 2148 struct filed *f; 2149 struct socklist *sl; 2150 char buf[100]; 2151 2152 STAILQ_FOREACH(f, &fhead, next) { 2153 /* flush any pending output */ 2154 if (f->f_prevcount) 2155 fprintlog_successive(f, 0); 2156 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0) 2157 close_filed(f); 2158 } 2159 if (signo) { 2160 dprintf("syslogd: exiting on signal %d\n", signo); 2161 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 2162 errno = 0; 2163 logerror(buf); 2164 } 2165 STAILQ_FOREACH(sl, &shead, next) { 2166 if (sl->sl_ss.ss_family == AF_LOCAL) 2167 unlink(sl->sl_peer->pe_name); 2168 } 2169 pidfile_remove(pfh); 2170 2171 exit(1); 2172 } 2173 2174 static int 2175 configfiles(const struct dirent *dp) 2176 { 2177 const char *p; 2178 size_t ext_len; 2179 2180 if (dp->d_name[0] == '.') 2181 return (0); 2182 2183 ext_len = sizeof(include_ext) -1; 2184 2185 if (dp->d_namlen <= ext_len) 2186 return (0); 2187 2188 p = &dp->d_name[dp->d_namlen - ext_len]; 2189 if (strcmp(p, include_ext) != 0) 2190 return (0); 2191 2192 return (1); 2193 } 2194 2195 static void 2196 readconfigfile(FILE *cf, int allow_includes) 2197 { 2198 FILE *cf2; 2199 struct filed *f; 2200 struct dirent **ent; 2201 char cline[LINE_MAX]; 2202 char host[MAXHOSTNAMELEN]; 2203 char prog[LINE_MAX]; 2204 char file[MAXPATHLEN]; 2205 char *p, *tmp; 2206 int i, nents; 2207 size_t include_len; 2208 2209 /* 2210 * Foreach line in the conf table, open that file. 2211 */ 2212 include_len = sizeof(include_str) -1; 2213 (void)strlcpy(host, "*", sizeof(host)); 2214 (void)strlcpy(prog, "*", sizeof(prog)); 2215 while (fgets(cline, sizeof(cline), cf) != NULL) { 2216 /* 2217 * check for end-of-section, comments, strip off trailing 2218 * spaces and newline character. #!prog is treated specially: 2219 * following lines apply only to that program. 2220 */ 2221 for (p = cline; isspace(*p); ++p) 2222 continue; 2223 if (*p == 0) 2224 continue; 2225 if (allow_includes && 2226 strncmp(p, include_str, include_len) == 0 && 2227 isspace(p[include_len])) { 2228 p += include_len; 2229 while (isspace(*p)) 2230 p++; 2231 tmp = p; 2232 while (*tmp != '\0' && !isspace(*tmp)) 2233 tmp++; 2234 *tmp = '\0'; 2235 dprintf("Trying to include files in '%s'\n", p); 2236 nents = scandir(p, &ent, configfiles, alphasort); 2237 if (nents == -1) { 2238 dprintf("Unable to open '%s': %s\n", p, 2239 strerror(errno)); 2240 continue; 2241 } 2242 for (i = 0; i < nents; i++) { 2243 if (snprintf(file, sizeof(file), "%s/%s", p, 2244 ent[i]->d_name) >= (int)sizeof(file)) { 2245 dprintf("ignoring path too long: " 2246 "'%s/%s'\n", p, ent[i]->d_name); 2247 free(ent[i]); 2248 continue; 2249 } 2250 free(ent[i]); 2251 cf2 = fopen(file, "r"); 2252 if (cf2 == NULL) 2253 continue; 2254 dprintf("reading %s\n", file); 2255 readconfigfile(cf2, 0); 2256 fclose(cf2); 2257 } 2258 free(ent); 2259 continue; 2260 } 2261 if (*p == '#') { 2262 p++; 2263 if (*p != '!' && *p != '+' && *p != '-') 2264 continue; 2265 } 2266 if (*p == '+' || *p == '-') { 2267 host[0] = *p++; 2268 while (isspace(*p)) 2269 p++; 2270 if ((!*p) || (*p == '*')) { 2271 (void)strlcpy(host, "*", sizeof(host)); 2272 continue; 2273 } 2274 if (*p == '@') 2275 p = LocalHostName; 2276 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 2277 if (!isalnum(*p) && *p != '.' && *p != '-' 2278 && *p != ',' && *p != ':' && *p != '%') 2279 break; 2280 host[i] = *p++; 2281 } 2282 host[i] = '\0'; 2283 continue; 2284 } 2285 if (*p == '!') { 2286 p++; 2287 while (isspace(*p)) p++; 2288 if ((!*p) || (*p == '*')) { 2289 (void)strlcpy(prog, "*", sizeof(prog)); 2290 continue; 2291 } 2292 for (i = 0; i < LINE_MAX - 1; i++) { 2293 if (!isprint(p[i]) || isspace(p[i])) 2294 break; 2295 prog[i] = p[i]; 2296 } 2297 prog[i] = 0; 2298 continue; 2299 } 2300 for (p = cline + 1; *p != '\0'; p++) { 2301 if (*p != '#') 2302 continue; 2303 if (*(p - 1) == '\\') { 2304 strcpy(p - 1, p); 2305 p--; 2306 continue; 2307 } 2308 *p = '\0'; 2309 break; 2310 } 2311 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 2312 cline[i] = '\0'; 2313 f = cfline(cline, prog, host); 2314 if (f != NULL) 2315 addfile(f); 2316 free(f); 2317 } 2318 } 2319 2320 static void 2321 sighandler(int signo) 2322 { 2323 2324 /* Send an wake-up signal to the select() loop. */ 2325 write(sigpipe[1], &signo, sizeof(signo)); 2326 } 2327 2328 /* 2329 * INIT -- Initialize syslogd from configuration table 2330 */ 2331 static void 2332 init(int signo) 2333 { 2334 int i; 2335 FILE *cf; 2336 struct filed *f; 2337 char *p; 2338 char oldLocalHostName[MAXHOSTNAMELEN]; 2339 char hostMsg[2*MAXHOSTNAMELEN+40]; 2340 char bootfileMsg[LINE_MAX]; 2341 2342 dprintf("init\n"); 2343 WantInitialize = 0; 2344 2345 /* 2346 * Load hostname (may have changed). 2347 */ 2348 if (signo != 0) 2349 (void)strlcpy(oldLocalHostName, LocalHostName, 2350 sizeof(oldLocalHostName)); 2351 if (gethostname(LocalHostName, sizeof(LocalHostName))) 2352 err(EX_OSERR, "gethostname() failed"); 2353 if ((p = strchr(LocalHostName, '.')) != NULL) { 2354 /* RFC 5424 prefers logging FQDNs. */ 2355 if (RFC3164OutputFormat) 2356 *p = '\0'; 2357 LocalDomain = p + 1; 2358 } else { 2359 LocalDomain = ""; 2360 } 2361 2362 /* 2363 * Load / reload timezone data (in case it changed). 2364 * 2365 * Just calling tzset() again does not work, the timezone code 2366 * caches the result. However, by setting the TZ variable, one 2367 * can defeat the caching and have the timezone code really 2368 * reload the timezone data. Respect any initial setting of 2369 * TZ, in case the system is configured specially. 2370 */ 2371 dprintf("loading timezone data via tzset()\n"); 2372 if (getenv("TZ")) { 2373 tzset(); 2374 } else { 2375 setenv("TZ", ":/etc/localtime", 1); 2376 tzset(); 2377 unsetenv("TZ"); 2378 } 2379 2380 /* 2381 * Close all open log files. 2382 */ 2383 Initialized = 0; 2384 STAILQ_FOREACH(f, &fhead, next) { 2385 /* flush any pending output */ 2386 if (f->f_prevcount) 2387 fprintlog_successive(f, 0); 2388 2389 switch (f->f_type) { 2390 case F_FILE: 2391 case F_FORW: 2392 case F_CONSOLE: 2393 case F_TTY: 2394 close_filed(f); 2395 break; 2396 case F_PIPE: 2397 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 2398 close_filed(f); 2399 break; 2400 } 2401 } 2402 while(!STAILQ_EMPTY(&fhead)) { 2403 f = STAILQ_FIRST(&fhead); 2404 STAILQ_REMOVE_HEAD(&fhead, next); 2405 free(f->f_program); 2406 free(f->f_host); 2407 free(f); 2408 } 2409 2410 /* open the configuration file */ 2411 if ((cf = fopen(ConfFile, "r")) == NULL) { 2412 dprintf("cannot open %s\n", ConfFile); 2413 f = cfline("*.ERR\t/dev/console", "*", "*"); 2414 if (f != NULL) 2415 addfile(f); 2416 free(f); 2417 f = cfline("*.PANIC\t*", "*", "*"); 2418 if (f != NULL) 2419 addfile(f); 2420 free(f); 2421 Initialized = 1; 2422 2423 return; 2424 } 2425 2426 readconfigfile(cf, 1); 2427 2428 /* close the configuration file */ 2429 (void)fclose(cf); 2430 2431 Initialized = 1; 2432 2433 if (Debug) { 2434 int port; 2435 STAILQ_FOREACH(f, &fhead, next) { 2436 for (i = 0; i <= LOG_NFACILITIES; i++) 2437 if (f->f_pmask[i] == INTERNAL_NOPRI) 2438 printf("X "); 2439 else 2440 printf("%d ", f->f_pmask[i]); 2441 printf("%s: ", TypeNames[f->f_type]); 2442 switch (f->f_type) { 2443 case F_FILE: 2444 printf("%s", f->fu_fname); 2445 break; 2446 2447 case F_CONSOLE: 2448 case F_TTY: 2449 printf("%s%s", _PATH_DEV, f->fu_fname); 2450 break; 2451 2452 case F_FORW: 2453 switch (f->fu_forw_addr->ai_addr->sa_family) { 2454 #ifdef INET 2455 case AF_INET: 2456 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 2457 break; 2458 #endif 2459 #ifdef INET6 2460 case AF_INET6: 2461 port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port); 2462 break; 2463 #endif 2464 default: 2465 port = 0; 2466 } 2467 if (port != 514) { 2468 printf("%s:%d", 2469 f->fu_forw_hname, port); 2470 } else { 2471 printf("%s", f->fu_forw_hname); 2472 } 2473 break; 2474 2475 case F_PIPE: 2476 printf("%s", f->fu_pipe_pname); 2477 break; 2478 2479 case F_USERS: 2480 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 2481 printf("%s, ", f->fu_uname[i]); 2482 break; 2483 } 2484 if (f->f_program) 2485 printf(" (%s)", f->f_program); 2486 printf("\n"); 2487 } 2488 } 2489 2490 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL, 2491 NULL, NULL, "restart", 0); 2492 dprintf("syslogd: restarted\n"); 2493 /* 2494 * Log a change in hostname, but only on a restart. 2495 */ 2496 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 2497 (void)snprintf(hostMsg, sizeof(hostMsg), 2498 "hostname changed, \"%s\" to \"%s\"", 2499 oldLocalHostName, LocalHostName); 2500 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", 2501 NULL, NULL, NULL, hostMsg, 0); 2502 dprintf("%s\n", hostMsg); 2503 } 2504 /* 2505 * Log the kernel boot file if we aren't going to use it as 2506 * the prefix, and if this is *not* a restart. 2507 */ 2508 if (signo == 0 && !use_bootfile) { 2509 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 2510 "kernel boot file is %s", bootfile); 2511 logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd", 2512 NULL, NULL, NULL, bootfileMsg, 0); 2513 dprintf("%s\n", bootfileMsg); 2514 } 2515 } 2516 2517 /* 2518 * Crack a configuration file line 2519 */ 2520 static struct filed * 2521 cfline(const char *line, const char *prog, const char *host) 2522 { 2523 struct filed *f; 2524 struct addrinfo hints, *res; 2525 int error, i, pri, syncfile; 2526 const char *p, *q; 2527 char *bp; 2528 char buf[MAXLINE], ebuf[100]; 2529 2530 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 2531 2532 f = calloc(1, sizeof(*f)); 2533 if (f == NULL) { 2534 logerror("malloc"); 2535 exit(1); 2536 } 2537 errno = 0; /* keep strerror() stuff out of logerror messages */ 2538 2539 for (i = 0; i <= LOG_NFACILITIES; i++) 2540 f->f_pmask[i] = INTERNAL_NOPRI; 2541 2542 /* save hostname if any */ 2543 if (host && *host == '*') 2544 host = NULL; 2545 if (host) { 2546 int hl; 2547 2548 f->f_host = strdup(host); 2549 if (f->f_host == NULL) { 2550 logerror("strdup"); 2551 exit(1); 2552 } 2553 hl = strlen(f->f_host); 2554 if (hl > 0 && f->f_host[hl-1] == '.') 2555 f->f_host[--hl] = '\0'; 2556 trimdomain(f->f_host, hl); 2557 } 2558 2559 /* save program name if any */ 2560 if (prog && *prog == '*') 2561 prog = NULL; 2562 if (prog) { 2563 f->f_program = strdup(prog); 2564 if (f->f_program == NULL) { 2565 logerror("strdup"); 2566 exit(1); 2567 } 2568 } 2569 2570 /* scan through the list of selectors */ 2571 for (p = line; *p && *p != '\t' && *p != ' ';) { 2572 int pri_done; 2573 int pri_cmp; 2574 int pri_invert; 2575 2576 /* find the end of this facility name list */ 2577 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2578 continue; 2579 2580 /* get the priority comparison */ 2581 pri_cmp = 0; 2582 pri_done = 0; 2583 pri_invert = 0; 2584 if (*q == '!') { 2585 pri_invert = 1; 2586 q++; 2587 } 2588 while (!pri_done) { 2589 switch (*q) { 2590 case '<': 2591 pri_cmp |= PRI_LT; 2592 q++; 2593 break; 2594 case '=': 2595 pri_cmp |= PRI_EQ; 2596 q++; 2597 break; 2598 case '>': 2599 pri_cmp |= PRI_GT; 2600 q++; 2601 break; 2602 default: 2603 pri_done++; 2604 break; 2605 } 2606 } 2607 2608 /* collect priority name */ 2609 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2610 *bp++ = *q++; 2611 *bp = '\0'; 2612 2613 /* skip cruft */ 2614 while (strchr(",;", *q)) 2615 q++; 2616 2617 /* decode priority name */ 2618 if (*buf == '*') { 2619 pri = LOG_PRIMASK; 2620 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2621 } else { 2622 /* Ignore trailing spaces. */ 2623 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2624 buf[i] = '\0'; 2625 2626 pri = decode(buf, prioritynames); 2627 if (pri < 0) { 2628 errno = 0; 2629 (void)snprintf(ebuf, sizeof ebuf, 2630 "unknown priority name \"%s\"", buf); 2631 logerror(ebuf); 2632 free(f); 2633 return (NULL); 2634 } 2635 } 2636 if (!pri_cmp) 2637 pri_cmp = (UniquePriority) 2638 ? (PRI_EQ) 2639 : (PRI_EQ | PRI_GT) 2640 ; 2641 if (pri_invert) 2642 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2643 2644 /* scan facilities */ 2645 while (*p && !strchr("\t.; ", *p)) { 2646 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2647 *bp++ = *p++; 2648 *bp = '\0'; 2649 2650 if (*buf == '*') { 2651 for (i = 0; i < LOG_NFACILITIES; i++) { 2652 f->f_pmask[i] = pri; 2653 f->f_pcmp[i] = pri_cmp; 2654 } 2655 } else { 2656 i = decode(buf, facilitynames); 2657 if (i < 0) { 2658 errno = 0; 2659 (void)snprintf(ebuf, sizeof ebuf, 2660 "unknown facility name \"%s\"", 2661 buf); 2662 logerror(ebuf); 2663 free(f); 2664 return (NULL); 2665 } 2666 f->f_pmask[i >> 3] = pri; 2667 f->f_pcmp[i >> 3] = pri_cmp; 2668 } 2669 while (*p == ',' || *p == ' ') 2670 p++; 2671 } 2672 2673 p = q; 2674 } 2675 2676 /* skip to action part */ 2677 while (*p == '\t' || *p == ' ') 2678 p++; 2679 2680 if (*p == '-') { 2681 syncfile = 0; 2682 p++; 2683 } else 2684 syncfile = 1; 2685 2686 switch (*p) { 2687 case '@': 2688 { 2689 char *tp; 2690 char endkey = ':'; 2691 /* 2692 * scan forward to see if there is a port defined. 2693 * so we can't use strlcpy.. 2694 */ 2695 i = sizeof(f->fu_forw_hname); 2696 tp = f->fu_forw_hname; 2697 p++; 2698 2699 /* 2700 * an ipv6 address should start with a '[' in that case 2701 * we should scan for a ']' 2702 */ 2703 if (*p == '[') { 2704 p++; 2705 endkey = ']'; 2706 } 2707 while (*p && (*p != endkey) && (i-- > 0)) { 2708 *tp++ = *p++; 2709 } 2710 if (endkey == ']' && *p == endkey) 2711 p++; 2712 *tp = '\0'; 2713 } 2714 /* See if we copied a domain and have a port */ 2715 if (*p == ':') 2716 p++; 2717 else 2718 p = NULL; 2719 2720 hints = (struct addrinfo){ 2721 .ai_family = family, 2722 .ai_socktype = SOCK_DGRAM 2723 }; 2724 error = getaddrinfo(f->fu_forw_hname, 2725 p ? p : "syslog", &hints, &res); 2726 if (error) { 2727 logerror(gai_strerror(error)); 2728 break; 2729 } 2730 f->fu_forw_addr = res; 2731 f->f_type = F_FORW; 2732 break; 2733 2734 case '/': 2735 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2736 f->f_type = F_UNUSED; 2737 logerror(p); 2738 break; 2739 } 2740 if (syncfile) 2741 f->f_flags |= FFLAG_SYNC; 2742 if (isatty(f->f_file)) { 2743 if (strcmp(p, ctty) == 0) 2744 f->f_type = F_CONSOLE; 2745 else 2746 f->f_type = F_TTY; 2747 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 2748 sizeof(f->fu_fname)); 2749 } else { 2750 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 2751 f->f_type = F_FILE; 2752 } 2753 break; 2754 2755 case '|': 2756 f->fu_pipe_pid = 0; 2757 (void)strlcpy(f->fu_pipe_pname, p + 1, 2758 sizeof(f->fu_pipe_pname)); 2759 f->f_type = F_PIPE; 2760 break; 2761 2762 case '*': 2763 f->f_type = F_WALL; 2764 break; 2765 2766 default: 2767 for (i = 0; i < MAXUNAMES && *p; i++) { 2768 for (q = p; *q && *q != ','; ) 2769 q++; 2770 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 2771 if ((q - p) >= MAXLOGNAME) 2772 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 2773 else 2774 f->fu_uname[i][q - p] = '\0'; 2775 while (*q == ',' || *q == ' ') 2776 q++; 2777 p = q; 2778 } 2779 f->f_type = F_USERS; 2780 break; 2781 } 2782 return (f); 2783 } 2784 2785 2786 /* 2787 * Decode a symbolic name to a numeric value 2788 */ 2789 static int 2790 decode(const char *name, const CODE *codetab) 2791 { 2792 const CODE *c; 2793 char *p, buf[40]; 2794 2795 if (isdigit(*name)) 2796 return (atoi(name)); 2797 2798 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2799 if (isupper(*name)) 2800 *p = tolower(*name); 2801 else 2802 *p = *name; 2803 } 2804 *p = '\0'; 2805 for (c = codetab; c->c_name; c++) 2806 if (!strcmp(buf, c->c_name)) 2807 return (c->c_val); 2808 2809 return (-1); 2810 } 2811 2812 static void 2813 markit(void) 2814 { 2815 struct filed *f; 2816 struct deadq_entry *dq, *dq0; 2817 2818 now = time((time_t *)NULL); 2819 MarkSeq += TIMERINTVL; 2820 if (MarkSeq >= MarkInterval) { 2821 logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL, 2822 "-- MARK --", MARK); 2823 MarkSeq = 0; 2824 } 2825 2826 STAILQ_FOREACH(f, &fhead, next) { 2827 if (f->f_prevcount && now >= REPEATTIME(f)) { 2828 dprintf("flush %s: repeated %d times, %d sec.\n", 2829 TypeNames[f->f_type], f->f_prevcount, 2830 repeatinterval[f->f_repeatcount]); 2831 fprintlog_successive(f, 0); 2832 BACKOFF(f); 2833 } 2834 } 2835 2836 /* Walk the dead queue, and see if we should signal somebody. */ 2837 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 2838 switch (dq->dq_timeout) { 2839 case 0: 2840 /* Already signalled once, try harder now. */ 2841 if (kill(dq->dq_pid, SIGKILL) != 0) 2842 (void)deadq_remove(dq); 2843 break; 2844 2845 case 1: 2846 /* 2847 * Timed out on dead queue, send terminate 2848 * signal. Note that we leave the removal 2849 * from the dead queue to reapchild(), which 2850 * will also log the event (unless the process 2851 * didn't even really exist, in case we simply 2852 * drop it from the dead queue). 2853 */ 2854 if (kill(dq->dq_pid, SIGTERM) != 0) 2855 (void)deadq_remove(dq); 2856 else 2857 dq->dq_timeout--; 2858 break; 2859 default: 2860 dq->dq_timeout--; 2861 } 2862 } 2863 MarkSet = 0; 2864 (void)alarm(TIMERINTVL); 2865 } 2866 2867 /* 2868 * fork off and become a daemon, but wait for the child to come online 2869 * before returning to the parent, or we get disk thrashing at boot etc. 2870 * Set a timer so we don't hang forever if it wedges. 2871 */ 2872 static int 2873 waitdaemon(int maxwait) 2874 { 2875 int fd; 2876 int status; 2877 pid_t pid, childpid; 2878 2879 switch (childpid = fork()) { 2880 case -1: 2881 return (-1); 2882 case 0: 2883 break; 2884 default: 2885 signal(SIGALRM, timedout); 2886 alarm(maxwait); 2887 while ((pid = wait3(&status, 0, NULL)) != -1) { 2888 if (WIFEXITED(status)) 2889 errx(1, "child pid %d exited with return code %d", 2890 pid, WEXITSTATUS(status)); 2891 if (WIFSIGNALED(status)) 2892 errx(1, "child pid %d exited on signal %d%s", 2893 pid, WTERMSIG(status), 2894 WCOREDUMP(status) ? " (core dumped)" : 2895 ""); 2896 if (pid == childpid) /* it's gone... */ 2897 break; 2898 } 2899 exit(0); 2900 } 2901 2902 if (setsid() == -1) 2903 return (-1); 2904 2905 (void)chdir("/"); 2906 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2907 (void)dup2(fd, STDIN_FILENO); 2908 (void)dup2(fd, STDOUT_FILENO); 2909 (void)dup2(fd, STDERR_FILENO); 2910 if (fd > STDERR_FILENO) 2911 (void)close(fd); 2912 } 2913 return (getppid()); 2914 } 2915 2916 /* 2917 * We get a SIGALRM from the child when it's running and finished doing it's 2918 * fsync()'s or O_SYNC writes for all the boot messages. 2919 * 2920 * We also get a signal from the kernel if the timer expires, so check to 2921 * see what happened. 2922 */ 2923 static void 2924 timedout(int sig __unused) 2925 { 2926 int left; 2927 left = alarm(0); 2928 signal(SIGALRM, SIG_DFL); 2929 if (left == 0) 2930 errx(1, "timed out waiting for child"); 2931 else 2932 _exit(0); 2933 } 2934 2935 /* 2936 * Add `s' to the list of allowable peer addresses to accept messages 2937 * from. 2938 * 2939 * `s' is a string in the form: 2940 * 2941 * [*]domainname[:{servicename|portnumber|*}] 2942 * 2943 * or 2944 * 2945 * netaddr/maskbits[:{servicename|portnumber|*}] 2946 * 2947 * Returns -1 on error, 0 if the argument was valid. 2948 */ 2949 static int 2950 allowaddr(char *s) 2951 { 2952 #if defined(INET) || defined(INET6) 2953 char *cp1, *cp2; 2954 struct allowedpeer *ap; 2955 struct servent *se; 2956 int masklen = -1; 2957 struct addrinfo hints, *res = NULL; 2958 #ifdef INET 2959 in_addr_t *addrp, *maskp; 2960 #endif 2961 #ifdef INET6 2962 uint32_t *addr6p, *mask6p; 2963 #endif 2964 char ip[NI_MAXHOST]; 2965 2966 ap = calloc(1, sizeof(*ap)); 2967 if (ap == NULL) 2968 err(1, "malloc failed"); 2969 2970 #ifdef INET6 2971 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2972 #endif 2973 cp1 = s; 2974 if ((cp1 = strrchr(cp1, ':'))) { 2975 /* service/port provided */ 2976 *cp1++ = '\0'; 2977 if (strlen(cp1) == 1 && *cp1 == '*') 2978 /* any port allowed */ 2979 ap->port = 0; 2980 else if ((se = getservbyname(cp1, "udp"))) { 2981 ap->port = ntohs(se->s_port); 2982 } else { 2983 ap->port = strtol(cp1, &cp2, 0); 2984 /* port not numeric */ 2985 if (*cp2 != '\0') 2986 goto err; 2987 } 2988 } else { 2989 if ((se = getservbyname("syslog", "udp"))) 2990 ap->port = ntohs(se->s_port); 2991 else 2992 /* sanity, should not happen */ 2993 ap->port = 514; 2994 } 2995 2996 if ((cp1 = strchr(s, '/')) != NULL && 2997 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2998 *cp1 = '\0'; 2999 if ((masklen = atoi(cp1 + 1)) < 0) 3000 goto err; 3001 } 3002 #ifdef INET6 3003 if (*s == '[') { 3004 cp2 = s + strlen(s) - 1; 3005 if (*cp2 == ']') { 3006 ++s; 3007 *cp2 = '\0'; 3008 } else { 3009 cp2 = NULL; 3010 } 3011 } else { 3012 cp2 = NULL; 3013 } 3014 #endif 3015 hints = (struct addrinfo){ 3016 .ai_family = PF_UNSPEC, 3017 .ai_socktype = SOCK_DGRAM, 3018 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3019 }; 3020 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 3021 ap->isnumeric = 1; 3022 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 3023 ap->a_mask = (struct sockaddr_storage){ 3024 .ss_family = res->ai_family, 3025 .ss_len = res->ai_addrlen 3026 }; 3027 switch (res->ai_family) { 3028 #ifdef INET 3029 case AF_INET: 3030 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 3031 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 3032 if (masklen < 0) { 3033 /* use default netmask */ 3034 if (IN_CLASSA(ntohl(*addrp))) 3035 *maskp = htonl(IN_CLASSA_NET); 3036 else if (IN_CLASSB(ntohl(*addrp))) 3037 *maskp = htonl(IN_CLASSB_NET); 3038 else 3039 *maskp = htonl(IN_CLASSC_NET); 3040 } else if (masklen == 0) { 3041 *maskp = 0; 3042 } else if (masklen <= 32) { 3043 /* convert masklen to netmask */ 3044 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 3045 } else { 3046 goto err; 3047 } 3048 /* Lose any host bits in the network number. */ 3049 *addrp &= *maskp; 3050 break; 3051 #endif 3052 #ifdef INET6 3053 case AF_INET6: 3054 if (masklen > 128) 3055 goto err; 3056 3057 if (masklen < 0) 3058 masklen = 128; 3059 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 3060 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 3061 /* convert masklen to netmask */ 3062 while (masklen > 0) { 3063 if (masklen < 32) { 3064 *mask6p = 3065 htonl(~(0xffffffff >> masklen)); 3066 *addr6p &= *mask6p; 3067 break; 3068 } else { 3069 *mask6p++ = 0xffffffff; 3070 addr6p++; 3071 masklen -= 32; 3072 } 3073 } 3074 break; 3075 #endif 3076 default: 3077 goto err; 3078 } 3079 freeaddrinfo(res); 3080 } else { 3081 /* arg `s' is domain name */ 3082 ap->isnumeric = 0; 3083 ap->a_name = s; 3084 if (cp1) 3085 *cp1 = '/'; 3086 #ifdef INET6 3087 if (cp2) { 3088 *cp2 = ']'; 3089 --s; 3090 } 3091 #endif 3092 } 3093 STAILQ_INSERT_TAIL(&aphead, ap, next); 3094 3095 if (Debug) { 3096 printf("allowaddr: rule "); 3097 if (ap->isnumeric) { 3098 printf("numeric, "); 3099 getnameinfo(sstosa(&ap->a_addr), 3100 (sstosa(&ap->a_addr))->sa_len, 3101 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 3102 printf("addr = %s, ", ip); 3103 getnameinfo(sstosa(&ap->a_mask), 3104 (sstosa(&ap->a_mask))->sa_len, 3105 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 3106 printf("mask = %s; ", ip); 3107 } else { 3108 printf("domainname = %s; ", ap->a_name); 3109 } 3110 printf("port = %d\n", ap->port); 3111 } 3112 #endif 3113 3114 return (0); 3115 err: 3116 if (res != NULL) 3117 freeaddrinfo(res); 3118 free(ap); 3119 return (-1); 3120 } 3121 3122 /* 3123 * Validate that the remote peer has permission to log to us. 3124 */ 3125 static int 3126 validate(struct sockaddr *sa, const char *hname) 3127 { 3128 int i; 3129 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 3130 struct allowedpeer *ap; 3131 #ifdef INET 3132 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 3133 #endif 3134 #ifdef INET6 3135 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 3136 #endif 3137 struct addrinfo hints, *res; 3138 u_short sport; 3139 int num = 0; 3140 3141 STAILQ_FOREACH(ap, &aphead, next) { 3142 num++; 3143 } 3144 dprintf("# of validation rule: %d\n", num); 3145 if (num == 0) 3146 /* traditional behaviour, allow everything */ 3147 return (1); 3148 3149 (void)strlcpy(name, hname, sizeof(name)); 3150 hints = (struct addrinfo){ 3151 .ai_family = PF_UNSPEC, 3152 .ai_socktype = SOCK_DGRAM, 3153 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3154 }; 3155 if (getaddrinfo(name, NULL, &hints, &res) == 0) 3156 freeaddrinfo(res); 3157 else if (strchr(name, '.') == NULL) { 3158 strlcat(name, ".", sizeof name); 3159 strlcat(name, LocalDomain, sizeof name); 3160 } 3161 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 3162 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 3163 return (0); /* for safety, should not occur */ 3164 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 3165 ip, port, name); 3166 sport = atoi(port); 3167 3168 /* now, walk down the list */ 3169 i = 0; 3170 STAILQ_FOREACH(ap, &aphead, next) { 3171 i++; 3172 if (ap->port != 0 && ap->port != sport) { 3173 dprintf("rejected in rule %d due to port mismatch.\n", 3174 i); 3175 continue; 3176 } 3177 3178 if (ap->isnumeric) { 3179 if (ap->a_addr.ss_family != sa->sa_family) { 3180 dprintf("rejected in rule %d due to address family mismatch.\n", i); 3181 continue; 3182 } 3183 #ifdef INET 3184 else if (ap->a_addr.ss_family == AF_INET) { 3185 sin4 = satosin(sa); 3186 a4p = satosin(&ap->a_addr); 3187 m4p = satosin(&ap->a_mask); 3188 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 3189 != a4p->sin_addr.s_addr) { 3190 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3191 continue; 3192 } 3193 } 3194 #endif 3195 #ifdef INET6 3196 else if (ap->a_addr.ss_family == AF_INET6) { 3197 sin6 = satosin6(sa); 3198 a6p = satosin6(&ap->a_addr); 3199 m6p = satosin6(&ap->a_mask); 3200 if (a6p->sin6_scope_id != 0 && 3201 sin6->sin6_scope_id != a6p->sin6_scope_id) { 3202 dprintf("rejected in rule %d due to scope mismatch.\n", i); 3203 continue; 3204 } 3205 if (IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 3206 &a6p->sin6_addr, &m6p->sin6_addr) != 0) { 3207 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3208 continue; 3209 } 3210 } 3211 #endif 3212 else 3213 continue; 3214 } else { 3215 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 3216 FNM_NOMATCH) { 3217 dprintf("rejected in rule %d due to name " 3218 "mismatch.\n", i); 3219 continue; 3220 } 3221 } 3222 dprintf("accepted in rule %d.\n", i); 3223 return (1); /* hooray! */ 3224 } 3225 return (0); 3226 } 3227 3228 /* 3229 * Fairly similar to popen(3), but returns an open descriptor, as 3230 * opposed to a FILE *. 3231 */ 3232 static int 3233 p_open(const char *prog, pid_t *rpid) 3234 { 3235 int pfd[2], nulldesc; 3236 pid_t pid; 3237 char *argv[4]; /* sh -c cmd NULL */ 3238 char errmsg[200]; 3239 3240 if (pipe(pfd) == -1) 3241 return (-1); 3242 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 3243 /* we are royally screwed anyway */ 3244 return (-1); 3245 3246 switch ((pid = fork())) { 3247 case -1: 3248 close(nulldesc); 3249 return (-1); 3250 3251 case 0: 3252 (void)setsid(); /* Avoid catching SIGHUPs. */ 3253 argv[0] = strdup("sh"); 3254 argv[1] = strdup("-c"); 3255 argv[2] = strdup(prog); 3256 argv[3] = NULL; 3257 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 3258 logerror("strdup"); 3259 exit(1); 3260 } 3261 3262 alarm(0); 3263 3264 /* Restore signals marked as SIG_IGN. */ 3265 (void)signal(SIGINT, SIG_DFL); 3266 (void)signal(SIGQUIT, SIG_DFL); 3267 (void)signal(SIGPIPE, SIG_DFL); 3268 3269 dup2(pfd[0], STDIN_FILENO); 3270 dup2(nulldesc, STDOUT_FILENO); 3271 dup2(nulldesc, STDERR_FILENO); 3272 closefrom(STDERR_FILENO + 1); 3273 3274 (void)execvp(_PATH_BSHELL, argv); 3275 _exit(255); 3276 } 3277 close(nulldesc); 3278 close(pfd[0]); 3279 /* 3280 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 3281 * supposed to get an EWOULDBLOCK on writev(2), which is 3282 * caught by the logic above anyway, which will in turn close 3283 * the pipe, and fork a new logging subprocess if necessary. 3284 * The stale subprocess will be killed some time later unless 3285 * it terminated itself due to closing its input pipe (so we 3286 * get rid of really dead puppies). 3287 */ 3288 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 3289 /* This is bad. */ 3290 (void)snprintf(errmsg, sizeof errmsg, 3291 "Warning: cannot change pipe to PID %d to " 3292 "non-blocking behaviour.", 3293 (int)pid); 3294 logerror(errmsg); 3295 } 3296 *rpid = pid; 3297 return (pfd[1]); 3298 } 3299 3300 static void 3301 deadq_enter(pid_t pid, const char *name) 3302 { 3303 struct deadq_entry *dq; 3304 int status; 3305 3306 if (pid == 0) 3307 return; 3308 /* 3309 * Be paranoid, if we can't signal the process, don't enter it 3310 * into the dead queue (perhaps it's already dead). If possible, 3311 * we try to fetch and log the child's status. 3312 */ 3313 if (kill(pid, 0) != 0) { 3314 if (waitpid(pid, &status, WNOHANG) > 0) 3315 log_deadchild(pid, status, name); 3316 return; 3317 } 3318 3319 dq = malloc(sizeof(*dq)); 3320 if (dq == NULL) { 3321 logerror("malloc"); 3322 exit(1); 3323 } 3324 *dq = (struct deadq_entry){ 3325 .dq_pid = pid, 3326 .dq_timeout = DQ_TIMO_INIT 3327 }; 3328 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 3329 } 3330 3331 static int 3332 deadq_remove(struct deadq_entry *dq) 3333 { 3334 if (dq != NULL) { 3335 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 3336 free(dq); 3337 return (1); 3338 } 3339 3340 return (0); 3341 } 3342 3343 static int 3344 deadq_removebypid(pid_t pid) 3345 { 3346 struct deadq_entry *dq; 3347 3348 TAILQ_FOREACH(dq, &deadq_head, dq_entries) { 3349 if (dq->dq_pid == pid) 3350 break; 3351 } 3352 return (deadq_remove(dq)); 3353 } 3354 3355 static void 3356 log_deadchild(pid_t pid, int status, const char *name) 3357 { 3358 int code; 3359 char buf[256]; 3360 const char *reason; 3361 3362 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 3363 if (WIFSIGNALED(status)) { 3364 reason = "due to signal"; 3365 code = WTERMSIG(status); 3366 } else { 3367 reason = "with status"; 3368 code = WEXITSTATUS(status); 3369 if (code == 0) 3370 return; 3371 } 3372 (void)snprintf(buf, sizeof buf, 3373 "Logging subprocess %d (%s) exited %s %d.", 3374 pid, name, reason, code); 3375 logerror(buf); 3376 } 3377 3378 static int 3379 socksetup(struct peer *pe) 3380 { 3381 struct addrinfo hints, *res, *res0; 3382 int error; 3383 char *cp; 3384 int (*sl_recv)(struct socklist *); 3385 /* 3386 * We have to handle this case for backwards compatibility: 3387 * If there are two (or more) colons but no '[' and ']', 3388 * assume this is an inet6 address without a service. 3389 */ 3390 if (pe->pe_name != NULL) { 3391 #ifdef INET6 3392 if (pe->pe_name[0] == '[' && 3393 (cp = strchr(pe->pe_name + 1, ']')) != NULL) { 3394 pe->pe_name = &pe->pe_name[1]; 3395 *cp = '\0'; 3396 if (cp[1] == ':' && cp[2] != '\0') 3397 pe->pe_serv = cp + 2; 3398 } else { 3399 #endif 3400 cp = strchr(pe->pe_name, ':'); 3401 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 3402 *cp = '\0'; 3403 if (cp[1] != '\0') 3404 pe->pe_serv = cp + 1; 3405 if (cp == pe->pe_name) 3406 pe->pe_name = NULL; 3407 } 3408 #ifdef INET6 3409 } 3410 #endif 3411 } 3412 hints = (struct addrinfo){ 3413 .ai_family = AF_UNSPEC, 3414 .ai_socktype = SOCK_DGRAM, 3415 .ai_flags = AI_PASSIVE 3416 }; 3417 if (pe->pe_name != NULL) 3418 dprintf("Trying peer: %s\n", pe->pe_name); 3419 if (pe->pe_serv == NULL) 3420 pe->pe_serv = "syslog"; 3421 error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0); 3422 if (error) { 3423 char *msgbuf; 3424 3425 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", 3426 pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv, 3427 gai_strerror(error)); 3428 errno = 0; 3429 if (msgbuf == NULL) 3430 logerror(gai_strerror(error)); 3431 else 3432 logerror(msgbuf); 3433 free(msgbuf); 3434 die(0); 3435 } 3436 for (res = res0; res != NULL; res = res->ai_next) { 3437 int s; 3438 3439 if (res->ai_family != AF_LOCAL && 3440 SecureMode > 1) { 3441 /* Only AF_LOCAL in secure mode. */ 3442 continue; 3443 } 3444 if (family != AF_UNSPEC && 3445 res->ai_family != AF_LOCAL && res->ai_family != family) 3446 continue; 3447 3448 s = socket(res->ai_family, res->ai_socktype, 3449 res->ai_protocol); 3450 if (s < 0) { 3451 logerror("socket"); 3452 error++; 3453 continue; 3454 } 3455 #ifdef INET6 3456 if (res->ai_family == AF_INET6) { 3457 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, 3458 &(int){1}, sizeof(int)) < 0) { 3459 logerror("setsockopt(IPV6_V6ONLY)"); 3460 close(s); 3461 error++; 3462 continue; 3463 } 3464 } 3465 #endif 3466 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 3467 &(int){1}, sizeof(int)) < 0) { 3468 logerror("setsockopt(SO_REUSEADDR)"); 3469 close(s); 3470 error++; 3471 continue; 3472 } 3473 3474 /* 3475 * Bind INET and UNIX-domain sockets. 3476 * 3477 * A UNIX-domain socket is always bound to a pathname 3478 * regardless of -N flag. 3479 * 3480 * For INET sockets, RFC 3164 recommends that client 3481 * side message should come from the privileged syslogd port. 3482 * 3483 * If the system administrator chooses not to obey 3484 * this, we can skip the bind() step so that the 3485 * system will choose a port for us. 3486 */ 3487 if (res->ai_family == AF_LOCAL) 3488 unlink(pe->pe_name); 3489 if (res->ai_family == AF_LOCAL || 3490 NoBind == 0 || pe->pe_name != NULL) { 3491 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { 3492 logerror("bind"); 3493 close(s); 3494 error++; 3495 continue; 3496 } 3497 if (res->ai_family == AF_LOCAL || 3498 SecureMode == 0) 3499 increase_rcvbuf(s); 3500 } 3501 if (res->ai_family == AF_LOCAL && 3502 chmod(pe->pe_name, pe->pe_mode) < 0) { 3503 dprintf("chmod %s: %s\n", pe->pe_name, 3504 strerror(errno)); 3505 close(s); 3506 error++; 3507 continue; 3508 } 3509 dprintf("new socket fd is %d\n", s); 3510 if (res->ai_socktype != SOCK_DGRAM) { 3511 listen(s, 5); 3512 } 3513 sl_recv = socklist_recv_sock; 3514 #if defined(INET) || defined(INET6) 3515 if (SecureMode && (res->ai_family == AF_INET || 3516 res->ai_family == AF_INET6)) { 3517 dprintf("shutdown\n"); 3518 /* Forbid communication in secure mode. */ 3519 if (shutdown(s, SHUT_RD) < 0 && 3520 errno != ENOTCONN) { 3521 logerror("shutdown"); 3522 if (!Debug) 3523 die(0); 3524 } 3525 sl_recv = NULL; 3526 } else 3527 #endif 3528 dprintf("listening on socket\n"); 3529 dprintf("sending on socket\n"); 3530 addsock(res->ai_addr, res->ai_addrlen, 3531 &(struct socklist){ 3532 .sl_socket = s, 3533 .sl_peer = pe, 3534 .sl_recv = sl_recv 3535 }); 3536 } 3537 freeaddrinfo(res0); 3538 3539 return(error); 3540 } 3541 3542 static void 3543 increase_rcvbuf(int fd) 3544 { 3545 socklen_t len; 3546 3547 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 3548 &(socklen_t){sizeof(len)}) == 0) { 3549 if (len < RCVBUF_MINSIZE) { 3550 len = RCVBUF_MINSIZE; 3551 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 3552 } 3553 } 3554 } 3555