1 /* $OpenBSD: syslogd.c,v 1.262 2019/07/05 13:23:27 bluhm Exp $ */ 2 3 /* 4 * Copyright (c) 2014-2017 Alexander Bluhm <bluhm@genua.de> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /* 20 * Copyright (c) 1983, 1988, 1993, 1994 21 * The Regents of the University of California. All rights reserved. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the above copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. Neither the name of the University nor the names of its contributors 32 * may be used to endorse or promote products derived from this software 33 * without specific prior written permission. 34 * 35 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 36 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 38 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 39 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 40 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 41 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 42 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 43 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 44 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 45 * SUCH DAMAGE. 46 */ 47 48 /* 49 * syslogd -- log system messages 50 * 51 * This program implements a system log. It takes a series of lines. 52 * Each line may have a priority, signified as "<n>" as 53 * the first characters of the line. If this is 54 * not present, a default priority is used. 55 * 56 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 57 * cause it to reread its configuration file. 58 * 59 * Defined Constants: 60 * 61 * MAXLINE -- the maximum line length that can be handled. 62 * DEFUPRI -- the default priority for user messages 63 * DEFSPRI -- the default priority for kernel messages 64 * 65 * Author: Eric Allman 66 * extensive changes by Ralph Campbell 67 * more extensive changes by Eric Allman (again) 68 * memory buffer logging by Damien Miller 69 * IPv6, libevent, syslog over TCP and TLS by Alexander Bluhm 70 */ 71 72 #define MAX_UDPMSG 1180 /* maximum UDP send size */ 73 #define MIN_MEMBUF (LOG_MAXLINE * 4) /* Minimum memory buffer size */ 74 #define MAX_MEMBUF (256 * 1024) /* Maximum memory buffer size */ 75 #define MAX_MEMBUF_NAME 64 /* Max length of membuf log name */ 76 #define MAX_TCPBUF (256 * 1024) /* Maximum tcp event buffer size */ 77 #define MAXSVLINE 120 /* maximum saved line length */ 78 #define FD_RESERVE 5 /* file descriptors not accepted */ 79 #define DEFUPRI (LOG_USER|LOG_NOTICE) 80 #define DEFSPRI (LOG_KERN|LOG_CRIT) 81 #define TIMERINTVL 30 /* interval for checking flush, mark */ 82 83 #include <sys/ioctl.h> 84 #include <sys/stat.h> 85 #include <sys/msgbuf.h> 86 #include <sys/queue.h> 87 #include <sys/sysctl.h> 88 #include <sys/un.h> 89 #include <sys/time.h> 90 #include <sys/resource.h> 91 92 #include <netinet/in.h> 93 #include <netdb.h> 94 #include <arpa/inet.h> 95 96 #include <ctype.h> 97 #include <err.h> 98 #include <errno.h> 99 #include <event.h> 100 #include <fcntl.h> 101 #include <fnmatch.h> 102 #include <limits.h> 103 #include <paths.h> 104 #include <signal.h> 105 #include <stdio.h> 106 #include <stdlib.h> 107 #include <string.h> 108 #include <tls.h> 109 #include <unistd.h> 110 #include <utmp.h> 111 #include <vis.h> 112 113 #define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b)) 114 #define MINIMUM(a, b) (((a) < (b)) ? (a) : (b)) 115 116 #define SYSLOG_NAMES 117 #include <sys/syslog.h> 118 119 #include "log.h" 120 #include "syslogd.h" 121 #include "evbuffer_tls.h" 122 123 char *ConfFile = _PATH_LOGCONF; 124 const char ctty[] = _PATH_CONSOLE; 125 126 #define MAXUNAMES 20 /* maximum number of user names */ 127 128 129 /* 130 * Flags to logline(). 131 */ 132 133 #define IGN_CONS 0x001 /* don't print on console */ 134 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 135 #define ADDDATE 0x004 /* add a date to the message */ 136 #define MARK 0x008 /* this message is a mark */ 137 138 /* 139 * This structure represents the files that will have log 140 * copies printed. 141 */ 142 143 struct filed { 144 SIMPLEQ_ENTRY(filed) f_next; /* next in linked list */ 145 int f_type; /* entry type, see below */ 146 int f_file; /* file descriptor */ 147 time_t f_time; /* time this was last written */ 148 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 149 char *f_program; /* program this applies to */ 150 char *f_hostname; /* host this applies to */ 151 union { 152 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 153 struct { 154 char f_loghost[1+4+3+1+NI_MAXHOST+1+NI_MAXSERV]; 155 /* @proto46://[hostname]:servname\0 */ 156 struct sockaddr_storage f_addr; 157 struct buffertls f_buftls; 158 struct bufferevent *f_bufev; 159 struct tls *f_ctx; 160 char *f_host; 161 int f_reconnectwait; 162 } f_forw; /* forwarding address */ 163 char f_fname[PATH_MAX]; 164 struct { 165 char f_mname[MAX_MEMBUF_NAME]; 166 struct ringbuf *f_rb; 167 int f_overflow; 168 int f_attached; 169 size_t f_len; 170 } f_mb; /* Memory buffer */ 171 } f_un; 172 char f_prevline[MAXSVLINE]; /* last message logged */ 173 char f_lasttime[33]; /* time of last occurrence */ 174 char f_prevhost[HOST_NAME_MAX+1]; /* host from which recd. */ 175 int f_prevpri; /* pri of f_prevline */ 176 int f_prevlen; /* length of f_prevline */ 177 int f_prevcount; /* repetition cnt of prevline */ 178 unsigned int f_repeatcount; /* number of "repeated" msgs */ 179 int f_quick; /* abort when matched */ 180 int f_dropped; /* warn, dropped message */ 181 time_t f_lasterrtime; /* last error was reported */ 182 }; 183 184 /* 185 * Intervals at which we flush out "message repeated" messages, 186 * in seconds after previous message is logged. After each flush, 187 * we move to the next interval until we reach the largest. 188 */ 189 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 190 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 191 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 192 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 193 (f)->f_repeatcount = MAXREPEAT; \ 194 } 195 196 /* values for f_type */ 197 #define F_UNUSED 0 /* unused entry */ 198 #define F_FILE 1 /* regular file */ 199 #define F_TTY 2 /* terminal */ 200 #define F_CONSOLE 3 /* console terminal */ 201 #define F_FORWUDP 4 /* remote machine via UDP */ 202 #define F_USERS 5 /* list of users */ 203 #define F_WALL 6 /* everyone logged on */ 204 #define F_MEMBUF 7 /* memory buffer */ 205 #define F_PIPE 8 /* pipe to external program */ 206 #define F_FORWTCP 9 /* remote machine via TCP */ 207 #define F_FORWTLS 10 /* remote machine via TLS */ 208 209 char *TypeNames[] = { 210 "UNUSED", "FILE", "TTY", "CONSOLE", 211 "FORWUDP", "USERS", "WALL", "MEMBUF", 212 "PIPE", "FORWTCP", "FORWTLS", 213 }; 214 215 SIMPLEQ_HEAD(filed_list, filed) Files; 216 struct filed consfile; 217 218 int Debug; /* debug flag */ 219 int Foreground; /* run in foreground, instead of daemonizing */ 220 char LocalHostName[HOST_NAME_MAX+1]; /* our hostname */ 221 char *LocalDomain; /* our local domain name */ 222 int Started = 0; /* set after privsep */ 223 int Initialized = 0; /* set when we have initialized ourselves */ 224 225 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 226 int MarkSeq = 0; /* mark sequence number */ 227 int PrivChild = 0; /* Exec the privileged parent process */ 228 int Repeat = 0; /* 0 msg repeated, 1 in files only, 2 never */ 229 int SecureMode = 1; /* when true, speak only unix domain socks */ 230 int NoDNS = 0; /* when true, refrain from doing DNS lookups */ 231 int ZuluTime = 0; /* display date and time in UTC ISO format */ 232 int IncludeHostname = 0; /* include RFC 3164 hostnames when forwarding */ 233 int Family = PF_UNSPEC; /* protocol family, may disable IPv4 or IPv6 */ 234 235 struct tls *server_ctx; 236 struct tls_config *client_config, *server_config; 237 const char *CAfile = "/etc/ssl/cert.pem"; /* file containing CA certificates */ 238 int NoVerify = 0; /* do not verify TLS server x509 certificate */ 239 const char *ClientCertfile = NULL; 240 const char *ClientKeyfile = NULL; 241 const char *ServerCAfile = NULL; 242 int tcpbuf_dropped = 0; /* count messages dropped from TCP or TLS */ 243 int file_dropped = 0; /* messages dropped due to file system full */ 244 int init_dropped = 0; /* messages dropped during initialization */ 245 246 #define CTL_READING_CMD 1 247 #define CTL_WRITING_REPLY 2 248 #define CTL_WRITING_CONT_REPLY 3 249 int ctl_state = 0; /* What the control socket is up to */ 250 int membuf_drop = 0; /* logs dropped in continuous membuf read */ 251 252 /* 253 * Client protocol NB. all numeric fields in network byte order 254 */ 255 #define CTL_VERSION 2 256 257 /* Request */ 258 struct { 259 u_int32_t version; 260 #define CMD_READ 1 /* Read out log */ 261 #define CMD_READ_CLEAR 2 /* Read and clear log */ 262 #define CMD_CLEAR 3 /* Clear log */ 263 #define CMD_LIST 4 /* List available logs */ 264 #define CMD_FLAGS 5 /* Query flags only */ 265 #define CMD_READ_CONT 6 /* Read out log continuously */ 266 u_int32_t cmd; 267 u_int32_t lines; 268 char logname[MAX_MEMBUF_NAME]; 269 } ctl_cmd; 270 271 size_t ctl_cmd_bytes = 0; /* number of bytes of ctl_cmd read */ 272 273 /* Reply */ 274 struct ctl_reply_hdr { 275 u_int32_t version; 276 #define CTL_HDR_FLAG_OVERFLOW 0x01 277 u_int32_t flags; 278 /* Reply text follows, up to MAX_MEMBUF long */ 279 }; 280 281 #define CTL_HDR_LEN (sizeof(struct ctl_reply_hdr)) 282 #define CTL_REPLY_MAXSIZE (CTL_HDR_LEN + MAX_MEMBUF) 283 #define CTL_REPLY_SIZE (strlen(reply_text) + CTL_HDR_LEN) 284 285 char *ctl_reply = NULL; /* Buffer for control connection reply */ 286 char *reply_text; /* Start of reply text in buffer */ 287 size_t ctl_reply_size = 0; /* Number of bytes used in reply */ 288 size_t ctl_reply_offset = 0; /* Number of bytes of reply written so far */ 289 290 char *linebuf; 291 int linesize; 292 293 int fd_ctlconn, fd_udp, fd_udp6, send_udp, send_udp6; 294 struct event *ev_ctlaccept, *ev_ctlread, *ev_ctlwrite; 295 296 struct peer { 297 struct buffertls p_buftls; 298 struct bufferevent *p_bufev; 299 struct tls *p_ctx; 300 char *p_peername; 301 char *p_hostname; 302 int p_fd; 303 }; 304 char hostname_unknown[] = "???"; 305 306 void klog_readcb(int, short, void *); 307 void udp_readcb(int, short, void *); 308 void unix_readcb(int, short, void *); 309 int reserve_accept4(int, int, struct event *, 310 void (*)(int, short, void *), struct sockaddr *, socklen_t *, int); 311 void tcp_acceptcb(int, short, void *); 312 void tls_acceptcb(int, short, void *); 313 void acceptcb(int, short, void *, int); 314 int octet_counting(struct evbuffer *, char **, int); 315 int non_transparent_framing(struct evbuffer *, char **); 316 void tcp_readcb(struct bufferevent *, void *); 317 void tcp_closecb(struct bufferevent *, short, void *); 318 int tcp_socket(struct filed *); 319 void tcp_dropcb(struct bufferevent *, void *); 320 void tcp_writecb(struct bufferevent *, void *); 321 void tcp_errorcb(struct bufferevent *, short, void *); 322 void tcp_connectcb(int, short, void *); 323 void tcp_connect_retry(struct bufferevent *, struct filed *); 324 int tcpbuf_countmsg(struct bufferevent *bufev); 325 void die_signalcb(int, short, void *); 326 void mark_timercb(int, short, void *); 327 void init_signalcb(int, short, void *); 328 void ctlsock_acceptcb(int, short, void *); 329 void ctlconn_readcb(int, short, void *); 330 void ctlconn_writecb(int, short, void *); 331 void ctlconn_logto(char *); 332 void ctlconn_cleanup(void); 333 334 struct filed *cfline(char *, char *, char *); 335 void cvthname(struct sockaddr *, char *, size_t); 336 int decode(const char *, const CODE *); 337 void markit(void); 338 void fprintlog(struct filed *, int, char *); 339 void dropped_warn(int *, const char *); 340 void init(void); 341 void logevent(int, const char *); 342 void logline(int, int, char *, char *); 343 struct filed *find_dup(struct filed *); 344 size_t parsepriority(const char *, int *); 345 void printline(char *, char *); 346 void printsys(char *); 347 void usage(void); 348 void wallmsg(struct filed *, struct iovec *); 349 int loghost_parse(char *, char **, char **, char **); 350 int getmsgbufsize(void); 351 void address_alloc(const char *, const char *, char ***, char ***, int *); 352 int socket_bind(const char *, const char *, const char *, int, 353 int *, int *); 354 int unix_socket(char *, int, mode_t); 355 void double_sockbuf(int, int, int); 356 void set_sockbuf(int); 357 void tailify_replytext(char *, int); 358 359 int 360 main(int argc, char *argv[]) 361 { 362 struct timeval to; 363 struct event *ev_klog, *ev_sendsys, *ev_udp, *ev_udp6, 364 *ev_bind, *ev_listen, *ev_tls, *ev_unix, 365 *ev_hup, *ev_int, *ev_quit, *ev_term, *ev_mark; 366 sigset_t sigmask; 367 const char *errstr; 368 char *p; 369 int ch, i; 370 int lockpipe[2] = { -1, -1}, pair[2], nullfd, fd; 371 int fd_ctlsock, fd_klog, fd_sendsys, *fd_bind, *fd_listen; 372 int *fd_tls, *fd_unix, nunix, nbind, nlisten, ntls; 373 char **path_unix, *path_ctlsock; 374 char **bind_host, **bind_port, **listen_host, **listen_port; 375 char *tls_hostport, **tls_host, **tls_port; 376 377 /* block signal until handler is set up */ 378 sigemptyset(&sigmask); 379 sigaddset(&sigmask, SIGHUP); 380 if (sigprocmask(SIG_SETMASK, &sigmask, NULL) == -1) 381 err(1, "sigprocmask block"); 382 383 if ((path_unix = malloc(sizeof(*path_unix))) == NULL) 384 err(1, "malloc %s", _PATH_LOG); 385 path_unix[0] = _PATH_LOG; 386 nunix = 1; 387 path_ctlsock = NULL; 388 389 bind_host = listen_host = tls_host = NULL; 390 bind_port = listen_port = tls_port = NULL; 391 tls_hostport = NULL; 392 nbind = nlisten = ntls = 0; 393 394 while ((ch = getopt(argc, argv, 395 "46a:C:c:dFf:hK:k:m:nP:p:rS:s:T:U:uVZ")) != -1) { 396 switch (ch) { 397 case '4': /* disable IPv6 */ 398 Family = PF_INET; 399 break; 400 case '6': /* disable IPv4 */ 401 Family = PF_INET6; 402 break; 403 case 'a': 404 if ((path_unix = reallocarray(path_unix, nunix + 1, 405 sizeof(*path_unix))) == NULL) 406 err(1, "unix path %s", optarg); 407 path_unix[nunix++] = optarg; 408 break; 409 case 'C': /* file containing CA certificates */ 410 CAfile = optarg; 411 break; 412 case 'c': /* file containing client certificate */ 413 ClientCertfile = optarg; 414 break; 415 case 'd': /* debug */ 416 Debug++; 417 break; 418 case 'F': /* foreground */ 419 Foreground = 1; 420 break; 421 case 'f': /* configuration file */ 422 ConfFile = optarg; 423 break; 424 case 'h': /* RFC 3164 hostnames */ 425 IncludeHostname = 1; 426 break; 427 case 'K': /* verify client with CA file */ 428 ServerCAfile = optarg; 429 break; 430 case 'k': /* file containing client key */ 431 ClientKeyfile = optarg; 432 break; 433 case 'm': /* mark interval */ 434 MarkInterval = strtonum(optarg, 0, 365*24*60, &errstr); 435 if (errstr) 436 errx(1, "mark_interval %s: %s", errstr, optarg); 437 MarkInterval *= 60; 438 break; 439 case 'n': /* don't do DNS lookups */ 440 NoDNS = 1; 441 break; 442 case 'P': /* used internally, exec the parent */ 443 PrivChild = strtonum(optarg, 2, INT_MAX, &errstr); 444 if (errstr) 445 errx(1, "priv child %s: %s", errstr, optarg); 446 break; 447 case 'p': /* path */ 448 path_unix[0] = optarg; 449 break; 450 case 'r': 451 Repeat++; 452 break; 453 case 'S': /* allow tls and listen on address */ 454 if (tls_hostport == NULL) 455 tls_hostport = optarg; 456 address_alloc("tls", optarg, &tls_host, &tls_port, 457 &ntls); 458 break; 459 case 's': 460 path_ctlsock = optarg; 461 break; 462 case 'T': /* allow tcp and listen on address */ 463 address_alloc("listen", optarg, &listen_host, 464 &listen_port, &nlisten); 465 break; 466 case 'U': /* allow udp only from address */ 467 address_alloc("bind", optarg, &bind_host, &bind_port, 468 &nbind); 469 break; 470 case 'u': /* allow udp input port */ 471 SecureMode = 0; 472 break; 473 case 'V': /* do not verify certificates */ 474 NoVerify = 1; 475 break; 476 case 'Z': /* time stamps in UTC ISO format */ 477 ZuluTime = 1; 478 break; 479 default: 480 usage(); 481 } 482 } 483 if (argc != optind) 484 usage(); 485 486 log_init(Debug, LOG_SYSLOG); 487 log_procinit("syslogd"); 488 if (Debug) 489 setvbuf(stdout, NULL, _IOLBF, 0); 490 491 if ((nullfd = open(_PATH_DEVNULL, O_RDWR)) == -1) 492 fatal("open %s", _PATH_DEVNULL); 493 for (fd = nullfd + 1; fd <= STDERR_FILENO; fd++) { 494 if (fcntl(fd, F_GETFL) == -1 && errno == EBADF) 495 if (dup2(nullfd, fd) == -1) 496 fatal("dup2 null"); 497 } 498 499 if (PrivChild > 1) 500 priv_exec(ConfFile, NoDNS, PrivChild, argc, argv); 501 502 consfile.f_type = F_CONSOLE; 503 (void)strlcpy(consfile.f_un.f_fname, ctty, 504 sizeof(consfile.f_un.f_fname)); 505 consfile.f_file = open(consfile.f_un.f_fname, O_WRONLY|O_NONBLOCK, 0); 506 if (consfile.f_file == -1) 507 log_warn("open %s", consfile.f_un.f_fname); 508 509 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 510 if ((p = strchr(LocalHostName, '.')) != NULL) { 511 *p++ = '\0'; 512 LocalDomain = p; 513 } else 514 LocalDomain = ""; 515 516 /* Reserve space for kernel message buffer plus buffer full message. */ 517 linesize = getmsgbufsize() + 64; 518 if (linesize < LOG_MAXLINE) 519 linesize = LOG_MAXLINE; 520 linesize++; 521 if ((linebuf = malloc(linesize)) == NULL) 522 fatal("allocate line buffer"); 523 524 if (socket_bind("udp", NULL, "syslog", SecureMode, 525 &fd_udp, &fd_udp6) == -1) 526 log_warnx("socket bind * failed"); 527 if ((fd_bind = reallocarray(NULL, nbind, sizeof(*fd_bind))) == NULL) 528 fatal("allocate bind fd"); 529 for (i = 0; i < nbind; i++) { 530 if (socket_bind("udp", bind_host[i], bind_port[i], 0, 531 &fd_bind[i], &fd_bind[i]) == -1) 532 log_warnx("socket bind udp failed"); 533 } 534 if ((fd_listen = reallocarray(NULL, nlisten, sizeof(*fd_listen))) 535 == NULL) 536 fatal("allocate listen fd"); 537 for (i = 0; i < nlisten; i++) { 538 if (socket_bind("tcp", listen_host[i], listen_port[i], 0, 539 &fd_listen[i], &fd_listen[i]) == -1) 540 log_warnx("socket listen tcp failed"); 541 } 542 if ((fd_tls = reallocarray(NULL, ntls, sizeof(*fd_tls))) == NULL) 543 fatal("allocate tls fd"); 544 for (i = 0; i < ntls; i++) { 545 if (socket_bind("tls", tls_host[i], tls_port[i], 0, 546 &fd_tls[i], &fd_tls[i]) == -1) 547 log_warnx("socket listen tls failed"); 548 } 549 550 if ((fd_unix = reallocarray(NULL, nunix, sizeof(*fd_unix))) == NULL) 551 fatal("allocate unix fd"); 552 for (i = 0; i < nunix; i++) { 553 fd_unix[i] = unix_socket(path_unix[i], SOCK_DGRAM, 0666); 554 if (fd_unix[i] == -1) { 555 if (i == 0) 556 log_warnx("log socket %s failed", path_unix[i]); 557 continue; 558 } 559 double_sockbuf(fd_unix[i], SO_RCVBUF, 0); 560 } 561 562 if (socketpair(AF_UNIX, SOCK_DGRAM, PF_UNSPEC, pair) == -1) { 563 log_warn("socketpair sendsyslog"); 564 fd_sendsys = -1; 565 } else { 566 /* 567 * Avoid to lose messages from sendsyslog(2). A larger 568 * 1 MB socket buffer compensates bursts. 569 */ 570 double_sockbuf(pair[0], SO_RCVBUF, 1<<20); 571 double_sockbuf(pair[1], SO_SNDBUF, 1<<20); 572 fd_sendsys = pair[0]; 573 } 574 575 fd_ctlsock = fd_ctlconn = -1; 576 if (path_ctlsock != NULL) { 577 fd_ctlsock = unix_socket(path_ctlsock, SOCK_STREAM, 0600); 578 if (fd_ctlsock == -1) { 579 log_warnx("control socket %s failed", path_ctlsock); 580 } else { 581 if (listen(fd_ctlsock, 5) == -1) { 582 log_warn("listen control socket"); 583 close(fd_ctlsock); 584 fd_ctlsock = -1; 585 } 586 } 587 } 588 589 if ((fd_klog = open(_PATH_KLOG, O_RDONLY, 0)) == -1) { 590 log_warn("open %s", _PATH_KLOG); 591 } else if (fd_sendsys != -1) { 592 /* Use /dev/klog to register sendsyslog(2) receiver. */ 593 if (ioctl(fd_klog, LIOCSFD, &pair[1]) == -1) 594 log_warn("ioctl klog LIOCSFD sendsyslog"); 595 } 596 if (fd_sendsys != -1) 597 close(pair[1]); 598 599 if (tls_init() == -1) { 600 log_warn("tls_init"); 601 } else { 602 if ((client_config = tls_config_new()) == NULL) 603 log_warn("tls_config_new client"); 604 if (tls_hostport) { 605 if ((server_config = tls_config_new()) == NULL) 606 log_warn("tls_config_new server"); 607 if ((server_ctx = tls_server()) == NULL) { 608 log_warn("tls_server"); 609 for (i = 0; i < ntls; i++) 610 close(fd_tls[i]); 611 free(fd_tls); 612 fd_tls = NULL; 613 free(tls_host); 614 free(tls_port); 615 tls_host = tls_port = NULL; 616 ntls = 0; 617 } 618 } 619 } 620 if (client_config) { 621 if (NoVerify) { 622 tls_config_insecure_noverifycert(client_config); 623 tls_config_insecure_noverifyname(client_config); 624 } else { 625 if (tls_config_set_ca_file(client_config, 626 CAfile) == -1) { 627 log_warnx("load client TLS CA: %s", 628 tls_config_error(client_config)); 629 /* avoid reading default certs in chroot */ 630 tls_config_set_ca_mem(client_config, "", 0); 631 } else 632 log_debug("CAfile %s", CAfile); 633 } 634 if (ClientCertfile && ClientKeyfile) { 635 if (tls_config_set_cert_file(client_config, 636 ClientCertfile) == -1) 637 log_warnx("load client TLS cert: %s", 638 tls_config_error(client_config)); 639 else 640 log_debug("ClientCertfile %s", ClientCertfile); 641 642 if (tls_config_set_key_file(client_config, 643 ClientKeyfile) == -1) 644 log_warnx("load client TLS key: %s", 645 tls_config_error(client_config)); 646 else 647 log_debug("ClientKeyfile %s", ClientKeyfile); 648 } else if (ClientCertfile || ClientKeyfile) { 649 log_warnx("options -c and -k must be used together"); 650 } 651 if (tls_config_set_protocols(client_config, 652 TLS_PROTOCOLS_ALL) != 0) 653 log_warnx("set client TLS protocols: %s", 654 tls_config_error(client_config)); 655 if (tls_config_set_ciphers(client_config, "all") != 0) 656 log_warnx("set client TLS ciphers: %s", 657 tls_config_error(client_config)); 658 } 659 if (server_config && server_ctx) { 660 const char *names[2]; 661 662 names[0] = tls_hostport; 663 names[1] = tls_host[0]; 664 665 for (i = 0; i < 2; i++) { 666 if (asprintf(&p, "/etc/ssl/private/%s.key", names[i]) 667 == -1) 668 continue; 669 if (tls_config_set_key_file(server_config, p) == -1) { 670 log_warnx("load server TLS key: %s", 671 tls_config_error(server_config)); 672 free(p); 673 continue; 674 } 675 log_debug("Keyfile %s", p); 676 free(p); 677 if (asprintf(&p, "/etc/ssl/%s.crt", names[i]) == -1) 678 continue; 679 if (tls_config_set_cert_file(server_config, p) == -1) { 680 log_warnx("load server TLS cert: %s", 681 tls_config_error(server_config)); 682 free(p); 683 continue; 684 } 685 log_debug("Certfile %s", p); 686 free(p); 687 break; 688 } 689 690 if (ServerCAfile) { 691 if (tls_config_set_ca_file(server_config, 692 ServerCAfile) == -1) { 693 log_warnx("load server TLS CA: %s", 694 tls_config_error(server_config)); 695 /* avoid reading default certs in chroot */ 696 tls_config_set_ca_mem(server_config, "", 0); 697 } else 698 log_debug("Server CAfile %s", ServerCAfile); 699 tls_config_verify_client(server_config); 700 } 701 if (tls_config_set_protocols(server_config, 702 TLS_PROTOCOLS_ALL) != 0) 703 log_warnx("set server TLS protocols: %s", 704 tls_config_error(server_config)); 705 if (tls_config_set_ciphers(server_config, "compat") != 0) 706 log_warnx("Set server TLS ciphers: %s", 707 tls_config_error(server_config)); 708 if (tls_configure(server_ctx, server_config) != 0) { 709 log_warnx("tls_configure server: %s", 710 tls_error(server_ctx)); 711 tls_free(server_ctx); 712 server_ctx = NULL; 713 for (i = 0; i < ntls; i++) 714 close(fd_tls[i]); 715 free(fd_tls); 716 fd_tls = NULL; 717 free(tls_host); 718 free(tls_port); 719 tls_host = tls_port = NULL; 720 ntls = 0; 721 } 722 } 723 724 log_debug("off & running...."); 725 726 if (!Debug && !Foreground) { 727 char c; 728 729 pipe(lockpipe); 730 731 switch(fork()) { 732 case -1: 733 err(1, "fork"); 734 case 0: 735 setsid(); 736 close(lockpipe[0]); 737 break; 738 default: 739 close(lockpipe[1]); 740 read(lockpipe[0], &c, 1); 741 _exit(0); 742 } 743 } 744 745 /* tuck my process id away */ 746 if (!Debug) { 747 FILE *fp; 748 749 fp = fopen(_PATH_LOGPID, "w"); 750 if (fp != NULL) { 751 fprintf(fp, "%ld\n", (long)getpid()); 752 (void) fclose(fp); 753 } 754 } 755 756 /* Privilege separation begins here */ 757 priv_init(lockpipe[1], nullfd, argc, argv); 758 759 if (pledge("stdio unix inet recvfd", NULL) == -1) 760 err(1, "pledge"); 761 762 Started = 1; 763 764 /* Process is now unprivileged and inside a chroot */ 765 if (Debug) 766 event_set_log_callback(logevent); 767 event_init(); 768 769 if ((ev_ctlaccept = malloc(sizeof(struct event))) == NULL || 770 (ev_ctlread = malloc(sizeof(struct event))) == NULL || 771 (ev_ctlwrite = malloc(sizeof(struct event))) == NULL || 772 (ev_klog = malloc(sizeof(struct event))) == NULL || 773 (ev_sendsys = malloc(sizeof(struct event))) == NULL || 774 (ev_udp = malloc(sizeof(struct event))) == NULL || 775 (ev_udp6 = malloc(sizeof(struct event))) == NULL || 776 (ev_bind = reallocarray(NULL, nbind, sizeof(struct event))) 777 == NULL || 778 (ev_listen = reallocarray(NULL, nlisten, sizeof(struct event))) 779 == NULL || 780 (ev_tls = reallocarray(NULL, ntls, sizeof(struct event))) 781 == NULL || 782 (ev_unix = reallocarray(NULL, nunix, sizeof(struct event))) 783 == NULL || 784 (ev_hup = malloc(sizeof(struct event))) == NULL || 785 (ev_int = malloc(sizeof(struct event))) == NULL || 786 (ev_quit = malloc(sizeof(struct event))) == NULL || 787 (ev_term = malloc(sizeof(struct event))) == NULL || 788 (ev_mark = malloc(sizeof(struct event))) == NULL) 789 err(1, "malloc"); 790 791 event_set(ev_ctlaccept, fd_ctlsock, EV_READ|EV_PERSIST, 792 ctlsock_acceptcb, ev_ctlaccept); 793 event_set(ev_ctlread, fd_ctlconn, EV_READ|EV_PERSIST, 794 ctlconn_readcb, ev_ctlread); 795 event_set(ev_ctlwrite, fd_ctlconn, EV_WRITE|EV_PERSIST, 796 ctlconn_writecb, ev_ctlwrite); 797 event_set(ev_klog, fd_klog, EV_READ|EV_PERSIST, klog_readcb, ev_klog); 798 event_set(ev_sendsys, fd_sendsys, EV_READ|EV_PERSIST, unix_readcb, 799 ev_sendsys); 800 event_set(ev_udp, fd_udp, EV_READ|EV_PERSIST, udp_readcb, ev_udp); 801 event_set(ev_udp6, fd_udp6, EV_READ|EV_PERSIST, udp_readcb, ev_udp6); 802 for (i = 0; i < nbind; i++) 803 event_set(&ev_bind[i], fd_bind[i], EV_READ|EV_PERSIST, 804 udp_readcb, &ev_bind[i]); 805 for (i = 0; i < nlisten; i++) 806 event_set(&ev_listen[i], fd_listen[i], EV_READ|EV_PERSIST, 807 tcp_acceptcb, &ev_listen[i]); 808 for (i = 0; i < ntls; i++) 809 event_set(&ev_tls[i], fd_tls[i], EV_READ|EV_PERSIST, 810 tls_acceptcb, &ev_tls[i]); 811 for (i = 0; i < nunix; i++) 812 event_set(&ev_unix[i], fd_unix[i], EV_READ|EV_PERSIST, 813 unix_readcb, &ev_unix[i]); 814 815 signal_set(ev_hup, SIGHUP, init_signalcb, ev_hup); 816 signal_set(ev_int, SIGINT, die_signalcb, ev_int); 817 signal_set(ev_quit, SIGQUIT, die_signalcb, ev_quit); 818 signal_set(ev_term, SIGTERM, die_signalcb, ev_term); 819 820 evtimer_set(ev_mark, mark_timercb, ev_mark); 821 822 init(); 823 824 /* Allocate ctl socket reply buffer if we have a ctl socket */ 825 if (fd_ctlsock != -1 && 826 (ctl_reply = malloc(CTL_REPLY_MAXSIZE)) == NULL) 827 fatal("allocate control socket reply buffer"); 828 reply_text = ctl_reply + CTL_HDR_LEN; 829 830 if (!Debug) { 831 close(lockpipe[1]); 832 dup2(nullfd, STDIN_FILENO); 833 dup2(nullfd, STDOUT_FILENO); 834 dup2(nullfd, STDERR_FILENO); 835 } 836 if (nullfd > 2) 837 close(nullfd); 838 839 /* 840 * Signal to the priv process that the initial config parsing is done 841 * so that it will reject any future attempts to open more files 842 */ 843 priv_config_parse_done(); 844 845 if (fd_ctlsock != -1) 846 event_add(ev_ctlaccept, NULL); 847 if (fd_klog != -1) 848 event_add(ev_klog, NULL); 849 if (fd_sendsys != -1) 850 event_add(ev_sendsys, NULL); 851 if (!SecureMode) { 852 if (fd_udp != -1) 853 event_add(ev_udp, NULL); 854 if (fd_udp6 != -1) 855 event_add(ev_udp6, NULL); 856 } else { 857 /* 858 * If generic UDP file descriptors are used neither 859 * for receiving nor for sending, close them. Then 860 * there is no useless *.514 in netstat. 861 */ 862 if (fd_udp != -1 && !send_udp) { 863 close(fd_udp); 864 fd_udp = -1; 865 } 866 if (fd_udp6 != -1 && !send_udp6) { 867 close(fd_udp6); 868 fd_udp6 = -1; 869 } 870 } 871 for (i = 0; i < nbind; i++) 872 if (fd_bind[i] != -1) 873 event_add(&ev_bind[i], NULL); 874 for (i = 0; i < nlisten; i++) 875 if (fd_listen[i] != -1) 876 event_add(&ev_listen[i], NULL); 877 for (i = 0; i < ntls; i++) 878 if (fd_tls[i] != -1) 879 event_add(&ev_tls[i], NULL); 880 for (i = 0; i < nunix; i++) 881 if (fd_unix[i] != -1) 882 event_add(&ev_unix[i], NULL); 883 884 signal_add(ev_hup, NULL); 885 signal_add(ev_term, NULL); 886 if (Debug || Foreground) { 887 signal_add(ev_int, NULL); 888 signal_add(ev_quit, NULL); 889 } else { 890 (void)signal(SIGINT, SIG_IGN); 891 (void)signal(SIGQUIT, SIG_IGN); 892 } 893 (void)signal(SIGCHLD, SIG_IGN); 894 (void)signal(SIGPIPE, SIG_IGN); 895 896 to.tv_sec = TIMERINTVL; 897 to.tv_usec = 0; 898 evtimer_add(ev_mark, &to); 899 900 log_info(LOG_INFO, "start"); 901 log_debug("syslogd: started"); 902 903 sigemptyset(&sigmask); 904 if (sigprocmask(SIG_SETMASK, &sigmask, NULL) == -1) 905 err(1, "sigprocmask unblock"); 906 907 event_dispatch(); 908 /* NOTREACHED */ 909 return (0); 910 } 911 912 void 913 address_alloc(const char *name, const char *address, char ***host, 914 char ***port, int *num) 915 { 916 char *p; 917 918 /* do not care about memory leak, argv has to be preserved */ 919 if ((p = strdup(address)) == NULL) 920 err(1, "%s address %s", name, address); 921 if ((*host = reallocarray(*host, *num + 1, sizeof(**host))) == NULL) 922 err(1, "%s host %s", name, address); 923 if ((*port = reallocarray(*port, *num + 1, sizeof(**port))) == NULL) 924 err(1, "%s port %s", name, address); 925 if (loghost_parse(p, NULL, *host + *num, *port + *num) == -1) 926 errx(1, "bad %s address: %s", name, address); 927 (*num)++; 928 } 929 930 int 931 socket_bind(const char *proto, const char *host, const char *port, 932 int shutread, int *fd, int *fd6) 933 { 934 struct addrinfo hints, *res, *res0; 935 char hostname[NI_MAXHOST], servname[NI_MAXSERV]; 936 int *fdp, error, reuseaddr; 937 938 *fd = *fd6 = -1; 939 if (proto == NULL) 940 proto = "udp"; 941 if (port == NULL) 942 port = strcmp(proto, "tls") == 0 ? "syslog-tls" : "syslog"; 943 944 memset(&hints, 0, sizeof(hints)); 945 hints.ai_family = Family; 946 if (strcmp(proto, "udp") == 0) { 947 hints.ai_socktype = SOCK_DGRAM; 948 hints.ai_protocol = IPPROTO_UDP; 949 } else { 950 hints.ai_socktype = SOCK_STREAM; 951 hints.ai_protocol = IPPROTO_TCP; 952 } 953 hints.ai_flags = AI_PASSIVE; 954 955 if ((error = getaddrinfo(host, port, &hints, &res0))) { 956 log_warnx("getaddrinfo proto %s, host %s, port %s: %s", 957 proto, host ? host : "*", port, gai_strerror(error)); 958 return (-1); 959 } 960 961 for (res = res0; res; res = res->ai_next) { 962 switch (res->ai_family) { 963 case AF_INET: 964 fdp = fd; 965 break; 966 case AF_INET6: 967 fdp = fd6; 968 break; 969 default: 970 continue; 971 } 972 if (*fdp >= 0) 973 continue; 974 975 if ((*fdp = socket(res->ai_family, 976 res->ai_socktype | SOCK_NONBLOCK, res->ai_protocol)) == -1) 977 continue; 978 979 if (getnameinfo(res->ai_addr, res->ai_addrlen, hostname, 980 sizeof(hostname), servname, sizeof(servname), 981 NI_NUMERICHOST | NI_NUMERICSERV | 982 (res->ai_socktype == SOCK_DGRAM ? NI_DGRAM : 0)) != 0) { 983 log_debug("Malformed bind address"); 984 hostname[0] = servname[0] = '\0'; 985 } 986 if (shutread && shutdown(*fdp, SHUT_RD) == -1) { 987 log_warn("shutdown SHUT_RD " 988 "protocol %d, address %s, portnum %s", 989 res->ai_protocol, hostname, servname); 990 close(*fdp); 991 *fdp = -1; 992 continue; 993 } 994 if (!shutread && res->ai_protocol == IPPROTO_UDP) 995 double_sockbuf(*fdp, SO_RCVBUF, 0); 996 else if (res->ai_protocol == IPPROTO_TCP) 997 set_sockbuf(*fdp); 998 reuseaddr = 1; 999 if (setsockopt(*fdp, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, 1000 sizeof(reuseaddr)) == -1) { 1001 log_warn("setsockopt SO_REUSEADDR " 1002 "protocol %d, address %s, portnum %s", 1003 res->ai_protocol, hostname, servname); 1004 close(*fdp); 1005 *fdp = -1; 1006 continue; 1007 } 1008 if (bind(*fdp, res->ai_addr, res->ai_addrlen) == -1) { 1009 log_warn("bind protocol %d, address %s, portnum %s", 1010 res->ai_protocol, hostname, servname); 1011 close(*fdp); 1012 *fdp = -1; 1013 continue; 1014 } 1015 if (!shutread && res->ai_protocol == IPPROTO_TCP && 1016 listen(*fdp, 10) == -1) { 1017 log_warn("listen protocol %d, address %s, portnum %s", 1018 res->ai_protocol, hostname, servname); 1019 close(*fdp); 1020 *fdp = -1; 1021 continue; 1022 } 1023 } 1024 1025 freeaddrinfo(res0); 1026 1027 if (*fd == -1 && *fd6 == -1) 1028 return (-1); 1029 return (0); 1030 } 1031 1032 void 1033 klog_readcb(int fd, short event, void *arg) 1034 { 1035 struct event *ev = arg; 1036 ssize_t n; 1037 1038 n = read(fd, linebuf, linesize - 1); 1039 if (n > 0) { 1040 linebuf[n] = '\0'; 1041 printsys(linebuf); 1042 } else if (n == -1 && errno != EINTR) { 1043 log_warn("read klog"); 1044 event_del(ev); 1045 } 1046 } 1047 1048 void 1049 udp_readcb(int fd, short event, void *arg) 1050 { 1051 struct sockaddr_storage sa; 1052 socklen_t salen; 1053 ssize_t n; 1054 1055 salen = sizeof(sa); 1056 n = recvfrom(fd, linebuf, LOG_MAXLINE, 0, (struct sockaddr *)&sa, 1057 &salen); 1058 if (n > 0) { 1059 char resolve[NI_MAXHOST]; 1060 1061 linebuf[n] = '\0'; 1062 cvthname((struct sockaddr *)&sa, resolve, sizeof(resolve)); 1063 log_debug("cvthname res: %s", resolve); 1064 printline(resolve, linebuf); 1065 } else if (n == -1 && errno != EINTR && errno != EWOULDBLOCK) 1066 log_warn("recvfrom udp"); 1067 } 1068 1069 void 1070 unix_readcb(int fd, short event, void *arg) 1071 { 1072 struct sockaddr_un sa; 1073 socklen_t salen; 1074 ssize_t n; 1075 1076 salen = sizeof(sa); 1077 n = recvfrom(fd, linebuf, LOG_MAXLINE, 0, (struct sockaddr *)&sa, 1078 &salen); 1079 if (n > 0) { 1080 linebuf[n] = '\0'; 1081 printline(LocalHostName, linebuf); 1082 } else if (n == -1 && errno != EINTR && errno != EWOULDBLOCK) 1083 log_warn("recvfrom unix"); 1084 } 1085 1086 int 1087 reserve_accept4(int lfd, int event, struct event *ev, 1088 void (*cb)(int, short, void *), 1089 struct sockaddr *sa, socklen_t *salen, int flags) 1090 { 1091 struct timeval to = { 1, 0 }; 1092 int afd; 1093 1094 if (event & EV_TIMEOUT) { 1095 log_debug("Listen again"); 1096 /* Enable the listen event, there is no timeout anymore. */ 1097 event_set(ev, lfd, EV_READ|EV_PERSIST, cb, ev); 1098 event_add(ev, NULL); 1099 errno = EWOULDBLOCK; 1100 return (-1); 1101 } 1102 1103 if (getdtablecount() + FD_RESERVE >= getdtablesize()) { 1104 afd = -1; 1105 errno = EMFILE; 1106 } else 1107 afd = accept4(lfd, sa, salen, flags); 1108 1109 if (afd == -1 && (errno == ENFILE || errno == EMFILE)) { 1110 log_info(LOG_WARNING, "accept deferred: %s", strerror(errno)); 1111 /* 1112 * Disable the listen event and convert it to a timeout. 1113 * Pass the listen file descriptor to the callback. 1114 */ 1115 event_del(ev); 1116 event_set(ev, lfd, 0, cb, ev); 1117 event_add(ev, &to); 1118 return (-1); 1119 } 1120 1121 return (afd); 1122 } 1123 1124 void 1125 tcp_acceptcb(int lfd, short event, void *arg) 1126 { 1127 acceptcb(lfd, event, arg, 0); 1128 } 1129 1130 void 1131 tls_acceptcb(int lfd, short event, void *arg) 1132 { 1133 acceptcb(lfd, event, arg, 1); 1134 } 1135 1136 void 1137 acceptcb(int lfd, short event, void *arg, int usetls) 1138 { 1139 struct event *ev = arg; 1140 struct peer *p; 1141 struct sockaddr_storage ss; 1142 socklen_t sslen; 1143 char hostname[NI_MAXHOST], servname[NI_MAXSERV]; 1144 char *peername; 1145 int fd; 1146 1147 sslen = sizeof(ss); 1148 if ((fd = reserve_accept4(lfd, event, ev, tcp_acceptcb, 1149 (struct sockaddr *)&ss, &sslen, SOCK_NONBLOCK)) == -1) { 1150 if (errno != ENFILE && errno != EMFILE && 1151 errno != EINTR && errno != EWOULDBLOCK && 1152 errno != ECONNABORTED) 1153 log_warn("accept tcp socket"); 1154 return; 1155 } 1156 log_debug("Accepting tcp connection"); 1157 1158 if (getnameinfo((struct sockaddr *)&ss, sslen, hostname, 1159 sizeof(hostname), servname, sizeof(servname), 1160 NI_NUMERICHOST | NI_NUMERICSERV) != 0 || 1161 asprintf(&peername, ss.ss_family == AF_INET6 ? 1162 "[%s]:%s" : "%s:%s", hostname, servname) == -1) { 1163 log_debug("Malformed accept address"); 1164 peername = hostname_unknown; 1165 } 1166 log_debug("Peer addresss and port %s", peername); 1167 if ((p = malloc(sizeof(*p))) == NULL) { 1168 log_warn("allocate \"%s\"", peername); 1169 close(fd); 1170 return; 1171 } 1172 p->p_fd = fd; 1173 if ((p->p_bufev = bufferevent_new(fd, tcp_readcb, NULL, tcp_closecb, 1174 p)) == NULL) { 1175 log_warn("bufferevent \"%s\"", peername); 1176 free(p); 1177 close(fd); 1178 return; 1179 } 1180 p->p_ctx = NULL; 1181 if (usetls) { 1182 if (tls_accept_socket(server_ctx, &p->p_ctx, fd) == -1) { 1183 log_warnx("tls_accept_socket \"%s\": %s", 1184 peername, tls_error(server_ctx)); 1185 bufferevent_free(p->p_bufev); 1186 free(p); 1187 close(fd); 1188 return; 1189 } 1190 buffertls_set(&p->p_buftls, p->p_bufev, p->p_ctx, fd); 1191 buffertls_accept(&p->p_buftls, fd); 1192 log_debug("tcp accept callback: tls context success"); 1193 } 1194 if (!NoDNS && peername != hostname_unknown && 1195 priv_getnameinfo((struct sockaddr *)&ss, ss.ss_len, hostname, 1196 sizeof(hostname)) != 0) { 1197 log_debug("Host name for accept address (%s) unknown", 1198 hostname); 1199 } 1200 if (peername == hostname_unknown || 1201 (p->p_hostname = strdup(hostname)) == NULL) 1202 p->p_hostname = hostname_unknown; 1203 log_debug("Peer hostname %s", hostname); 1204 p->p_peername = peername; 1205 bufferevent_enable(p->p_bufev, EV_READ); 1206 1207 log_info(LOG_DEBUG, "%s logger \"%s\" accepted", 1208 p->p_ctx ? "tls" : "tcp", peername); 1209 } 1210 1211 /* 1212 * Syslog over TCP RFC 6587 3.4.1. Octet Counting 1213 */ 1214 int 1215 octet_counting(struct evbuffer *evbuf, char **msg, int drain) 1216 { 1217 char *p, *buf, *end; 1218 int len; 1219 1220 buf = EVBUFFER_DATA(evbuf); 1221 end = buf + EVBUFFER_LENGTH(evbuf); 1222 /* 1223 * It can be assumed that octet-counting framing is used if a syslog 1224 * frame starts with a digit. 1225 */ 1226 if (buf >= end || !isdigit((unsigned char)*buf)) 1227 return (-1); 1228 /* 1229 * SYSLOG-FRAME = MSG-LEN SP SYSLOG-MSG 1230 * MSG-LEN is the octet count of the SYSLOG-MSG in the SYSLOG-FRAME. 1231 * We support up to 5 digits in MSG-LEN, so the maximum is 99999. 1232 */ 1233 for (p = buf; p < end && p < buf + 5; p++) { 1234 if (!isdigit((unsigned char)*p)) 1235 break; 1236 } 1237 if (buf >= p || p >= end || *p != ' ') 1238 return (-1); 1239 p++; 1240 /* Using atoi() is safe as buf starts with 1 to 5 digits and a space. */ 1241 len = atoi(buf); 1242 if (drain) 1243 log_debugadd(" octet counting %d", len); 1244 if (p + len > end) 1245 return (0); 1246 if (drain) 1247 evbuffer_drain(evbuf, p - buf); 1248 if (msg) 1249 *msg = p; 1250 return (len); 1251 } 1252 1253 /* 1254 * Syslog over TCP RFC 6587 3.4.2. Non-Transparent-Framing 1255 */ 1256 int 1257 non_transparent_framing(struct evbuffer *evbuf, char **msg) 1258 { 1259 char *p, *buf, *end; 1260 1261 buf = EVBUFFER_DATA(evbuf); 1262 end = buf + EVBUFFER_LENGTH(evbuf); 1263 /* 1264 * The TRAILER has usually been a single character and most often 1265 * is ASCII LF (%d10). However, other characters have also been 1266 * seen, with ASCII NUL (%d00) being a prominent example. 1267 */ 1268 for (p = buf; p < end; p++) { 1269 if (*p == '\0' || *p == '\n') 1270 break; 1271 } 1272 if (p + 1 - buf >= INT_MAX) 1273 return (-1); 1274 log_debugadd(" non transparent framing"); 1275 if (p >= end) 1276 return (0); 1277 /* 1278 * Some devices have also been seen to emit a two-character 1279 * TRAILER, which is usually CR and LF. 1280 */ 1281 if (buf < p && p[0] == '\n' && p[-1] == '\r') 1282 p[-1] = '\0'; 1283 if (msg) 1284 *msg = buf; 1285 return (p + 1 - buf); 1286 } 1287 1288 void 1289 tcp_readcb(struct bufferevent *bufev, void *arg) 1290 { 1291 struct peer *p = arg; 1292 char *msg; 1293 int len; 1294 1295 while (EVBUFFER_LENGTH(bufev->input) > 0) { 1296 log_debugadd("%s logger \"%s\"", p->p_ctx ? "tls" : "tcp", 1297 p->p_peername); 1298 msg = NULL; 1299 len = octet_counting(bufev->input, &msg, 1); 1300 if (len < 0) 1301 len = non_transparent_framing(bufev->input, &msg); 1302 if (len < 0) 1303 log_debugadd("unknown method"); 1304 if (msg == NULL) { 1305 log_debugadd(", incomplete frame"); 1306 break; 1307 } 1308 log_debug(", use %d bytes", len); 1309 if (len > 0 && msg[len-1] == '\n') 1310 msg[len-1] = '\0'; 1311 if (len == 0 || msg[len-1] != '\0') { 1312 memcpy(linebuf, msg, MINIMUM(len, LOG_MAXLINE)); 1313 linebuf[MINIMUM(len, LOG_MAXLINE)] = '\0'; 1314 msg = linebuf; 1315 } 1316 printline(p->p_hostname, msg); 1317 evbuffer_drain(bufev->input, len); 1318 } 1319 /* Maximum frame has 5 digits, 1 space, MAXLINE chars, 1 new line. */ 1320 if (EVBUFFER_LENGTH(bufev->input) >= 5 + 1 + LOG_MAXLINE + 1) { 1321 log_debug(", use %zu bytes", EVBUFFER_LENGTH(bufev->input)); 1322 printline(p->p_hostname, EVBUFFER_DATA(bufev->input)); 1323 evbuffer_drain(bufev->input, -1); 1324 } else if (EVBUFFER_LENGTH(bufev->input) > 0) 1325 log_debug(", buffer %zu bytes", EVBUFFER_LENGTH(bufev->input)); 1326 } 1327 1328 void 1329 tcp_closecb(struct bufferevent *bufev, short event, void *arg) 1330 { 1331 struct peer *p = arg; 1332 1333 if (event & EVBUFFER_EOF) { 1334 log_info(LOG_DEBUG, "%s logger \"%s\" connection close", 1335 p->p_ctx ? "tls" : "tcp", p->p_peername); 1336 } else { 1337 log_info(LOG_NOTICE, "%s logger \"%s\" connection error: %s", 1338 p->p_ctx ? "tls" : "tcp", p->p_peername, 1339 p->p_ctx ? tls_error(p->p_ctx) : strerror(errno)); 1340 } 1341 1342 if (p->p_peername != hostname_unknown) 1343 free(p->p_peername); 1344 if (p->p_hostname != hostname_unknown) 1345 free(p->p_hostname); 1346 bufferevent_free(p->p_bufev); 1347 close(p->p_fd); 1348 free(p); 1349 } 1350 1351 int 1352 tcp_socket(struct filed *f) 1353 { 1354 int s; 1355 1356 if ((s = socket(f->f_un.f_forw.f_addr.ss_family, 1357 SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP)) == -1) { 1358 log_warn("socket \"%s\"", f->f_un.f_forw.f_loghost); 1359 return (-1); 1360 } 1361 set_sockbuf(s); 1362 if (connect(s, (struct sockaddr *)&f->f_un.f_forw.f_addr, 1363 f->f_un.f_forw.f_addr.ss_len) == -1 && errno != EINPROGRESS) { 1364 log_warn("connect \"%s\"", f->f_un.f_forw.f_loghost); 1365 close(s); 1366 return (-1); 1367 } 1368 return (s); 1369 } 1370 1371 void 1372 tcp_dropcb(struct bufferevent *bufev, void *arg) 1373 { 1374 struct filed *f = arg; 1375 1376 /* 1377 * Drop data received from the forward log server. 1378 */ 1379 log_debug("loghost \"%s\" did send %zu bytes back", 1380 f->f_un.f_forw.f_loghost, EVBUFFER_LENGTH(bufev->input)); 1381 evbuffer_drain(bufev->input, -1); 1382 } 1383 1384 void 1385 tcp_writecb(struct bufferevent *bufev, void *arg) 1386 { 1387 struct filed *f = arg; 1388 char ebuf[ERRBUFSIZE]; 1389 1390 /* 1391 * Successful write, connection to server is good, reset wait time. 1392 */ 1393 log_debug("loghost \"%s\" successful write", f->f_un.f_forw.f_loghost); 1394 f->f_un.f_forw.f_reconnectwait = 0; 1395 1396 if (f->f_dropped > 0 && 1397 EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->output) < MAX_TCPBUF) { 1398 snprintf(ebuf, sizeof(ebuf), "to loghost \"%s\"", 1399 f->f_un.f_forw.f_loghost); 1400 dropped_warn(&f->f_dropped, ebuf); 1401 } 1402 } 1403 1404 void 1405 tcp_errorcb(struct bufferevent *bufev, short event, void *arg) 1406 { 1407 struct filed *f = arg; 1408 char *p, *buf, *end; 1409 int l; 1410 char ebuf[ERRBUFSIZE]; 1411 1412 if (event & EVBUFFER_EOF) 1413 snprintf(ebuf, sizeof(ebuf), "loghost \"%s\" connection close", 1414 f->f_un.f_forw.f_loghost); 1415 else 1416 snprintf(ebuf, sizeof(ebuf), 1417 "loghost \"%s\" connection error: %s", 1418 f->f_un.f_forw.f_loghost, f->f_un.f_forw.f_ctx ? 1419 tls_error(f->f_un.f_forw.f_ctx) : strerror(errno)); 1420 log_debug("%s", ebuf); 1421 1422 /* The SIGHUP handler may also close the socket, so invalidate it. */ 1423 if (f->f_un.f_forw.f_ctx) { 1424 tls_close(f->f_un.f_forw.f_ctx); 1425 tls_free(f->f_un.f_forw.f_ctx); 1426 f->f_un.f_forw.f_ctx = NULL; 1427 } 1428 close(f->f_file); 1429 f->f_file = -1; 1430 1431 /* 1432 * The messages in the output buffer may be out of sync. 1433 * Check that the buffer starts with "1234 <1234 octets>\n". 1434 * Otherwise remove the partial message from the beginning. 1435 */ 1436 buf = EVBUFFER_DATA(bufev->output); 1437 end = buf + EVBUFFER_LENGTH(bufev->output); 1438 if (buf < end && !((l = octet_counting(bufev->output, &p, 0)) > 0 && 1439 p[l-1] == '\n')) { 1440 for (p = buf; p < end; p++) { 1441 if (*p == '\n') { 1442 evbuffer_drain(bufev->output, p - buf + 1); 1443 break; 1444 } 1445 } 1446 /* Without '\n' discard everything. */ 1447 if (p == end) 1448 evbuffer_drain(bufev->output, -1); 1449 log_debug("loghost \"%s\" dropped partial message", 1450 f->f_un.f_forw.f_loghost); 1451 f->f_dropped++; 1452 } 1453 1454 tcp_connect_retry(bufev, f); 1455 1456 /* Log the connection error to the fresh buffer after reconnecting. */ 1457 log_info(LOG_WARNING, "%s", ebuf); 1458 } 1459 1460 void 1461 tcp_connectcb(int fd, short event, void *arg) 1462 { 1463 struct filed *f = arg; 1464 struct bufferevent *bufev = f->f_un.f_forw.f_bufev; 1465 int s; 1466 1467 if ((s = tcp_socket(f)) == -1) { 1468 tcp_connect_retry(bufev, f); 1469 return; 1470 } 1471 log_debug("tcp connect callback: socket success, event %#x", event); 1472 f->f_file = s; 1473 1474 bufferevent_setfd(bufev, s); 1475 bufferevent_setcb(bufev, tcp_dropcb, tcp_writecb, tcp_errorcb, f); 1476 /* 1477 * Although syslog is a write only protocol, enable reading from 1478 * the socket to detect connection close and errors. 1479 */ 1480 bufferevent_enable(bufev, EV_READ|EV_WRITE); 1481 1482 if (f->f_type == F_FORWTLS) { 1483 if ((f->f_un.f_forw.f_ctx = tls_client()) == NULL) { 1484 log_warn("tls_client \"%s\"", f->f_un.f_forw.f_loghost); 1485 goto error; 1486 } 1487 if (client_config && 1488 tls_configure(f->f_un.f_forw.f_ctx, client_config) == -1) { 1489 log_warnx("tls_configure \"%s\": %s", 1490 f->f_un.f_forw.f_loghost, 1491 tls_error(f->f_un.f_forw.f_ctx)); 1492 goto error; 1493 } 1494 if (tls_connect_socket(f->f_un.f_forw.f_ctx, s, 1495 f->f_un.f_forw.f_host) == -1) { 1496 log_warnx("tls_connect_socket \"%s\": %s", 1497 f->f_un.f_forw.f_loghost, 1498 tls_error(f->f_un.f_forw.f_ctx)); 1499 goto error; 1500 } 1501 log_debug("tcp connect callback: tls context success"); 1502 1503 buffertls_set(&f->f_un.f_forw.f_buftls, bufev, 1504 f->f_un.f_forw.f_ctx, s); 1505 buffertls_connect(&f->f_un.f_forw.f_buftls, s); 1506 } 1507 1508 return; 1509 1510 error: 1511 if (f->f_un.f_forw.f_ctx) { 1512 tls_free(f->f_un.f_forw.f_ctx); 1513 f->f_un.f_forw.f_ctx = NULL; 1514 } 1515 close(f->f_file); 1516 f->f_file = -1; 1517 tcp_connect_retry(bufev, f); 1518 } 1519 1520 void 1521 tcp_connect_retry(struct bufferevent *bufev, struct filed *f) 1522 { 1523 struct timeval to; 1524 1525 if (f->f_un.f_forw.f_reconnectwait == 0) 1526 f->f_un.f_forw.f_reconnectwait = 1; 1527 else 1528 f->f_un.f_forw.f_reconnectwait <<= 1; 1529 if (f->f_un.f_forw.f_reconnectwait > 600) 1530 f->f_un.f_forw.f_reconnectwait = 600; 1531 to.tv_sec = f->f_un.f_forw.f_reconnectwait; 1532 to.tv_usec = 0; 1533 1534 log_debug("tcp connect retry: wait %d", 1535 f->f_un.f_forw.f_reconnectwait); 1536 bufferevent_setfd(bufev, -1); 1537 /* We can reuse the write event as bufferevent is disabled. */ 1538 evtimer_set(&bufev->ev_write, tcp_connectcb, f); 1539 evtimer_add(&bufev->ev_write, &to); 1540 } 1541 1542 int 1543 tcpbuf_countmsg(struct bufferevent *bufev) 1544 { 1545 char *p, *buf, *end; 1546 int i = 0; 1547 1548 buf = EVBUFFER_DATA(bufev->output); 1549 end = buf + EVBUFFER_LENGTH(bufev->output); 1550 for (p = buf; p < end; p++) { 1551 if (*p == '\n') 1552 i++; 1553 } 1554 return (i); 1555 } 1556 1557 void 1558 usage(void) 1559 { 1560 1561 (void)fprintf(stderr, 1562 "usage: syslogd [-46dFhnruVZ] [-a path] [-C CAfile]\n" 1563 "\t[-c cert_file] [-f config_file] [-K CAfile] [-k key_file]\n" 1564 "\t[-m mark_interval] [-p log_socket] [-S listen_address]\n" 1565 "\t[-s reporting_socket] [-T listen_address] [-U bind_address]\n"); 1566 exit(1); 1567 } 1568 1569 /* 1570 * Parse a priority code of the form "<123>" into pri, and return the 1571 * length of the priority code including the surrounding angle brackets. 1572 */ 1573 size_t 1574 parsepriority(const char *msg, int *pri) 1575 { 1576 size_t nlen; 1577 char buf[11]; 1578 const char *errstr; 1579 int maybepri; 1580 1581 if (*msg++ == '<') { 1582 nlen = strspn(msg, "1234567890"); 1583 if (nlen > 0 && nlen < sizeof(buf) && msg[nlen] == '>') { 1584 strlcpy(buf, msg, nlen + 1); 1585 maybepri = strtonum(buf, 0, INT_MAX, &errstr); 1586 if (errstr == NULL) { 1587 *pri = maybepri; 1588 return nlen + 2; 1589 } 1590 } 1591 } 1592 1593 return 0; 1594 } 1595 1596 /* 1597 * Take a raw input line, decode the message, and print the message 1598 * on the appropriate log files. 1599 */ 1600 void 1601 printline(char *hname, char *msg) 1602 { 1603 int pri; 1604 char *p, *q, line[LOG_MAXLINE + 4 + 1]; /* message, encoding, NUL */ 1605 1606 /* test for special codes */ 1607 pri = DEFUPRI; 1608 p = msg; 1609 p += parsepriority(p, &pri); 1610 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1611 pri = DEFUPRI; 1612 1613 /* 1614 * Don't allow users to log kernel messages. 1615 * NOTE: since LOG_KERN == 0 this will also match 1616 * messages with no facility specified. 1617 */ 1618 if (LOG_FAC(pri) == LOG_KERN) 1619 pri = LOG_USER | LOG_PRI(pri); 1620 1621 for (q = line; *p && q < &line[LOG_MAXLINE]; p++) { 1622 if (*p == '\n') 1623 *q++ = ' '; 1624 else 1625 q = vis(q, *p, 0, 0); 1626 } 1627 line[LOG_MAXLINE] = *q = '\0'; 1628 1629 logline(pri, 0, hname, line); 1630 } 1631 1632 /* 1633 * Take a raw input line from /dev/klog, split and format similar to syslog(). 1634 */ 1635 void 1636 printsys(char *msg) 1637 { 1638 int c, pri, flags; 1639 char *lp, *p, *q, line[LOG_MAXLINE + 1]; 1640 size_t prilen; 1641 int l; 1642 1643 l = snprintf(line, sizeof(line), "%s: ", _PATH_UNIX); 1644 if (l < 0 || l >= sizeof(line)) { 1645 line[0] = '\0'; 1646 l = 0; 1647 } 1648 lp = line + l; 1649 for (p = msg; *p != '\0'; ) { 1650 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 1651 pri = DEFSPRI; 1652 prilen = parsepriority(p, &pri); 1653 p += prilen; 1654 if (prilen == 0) { 1655 /* kernel printf's come out on console */ 1656 flags |= IGN_CONS; 1657 } 1658 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1659 pri = DEFSPRI; 1660 1661 q = lp; 1662 while (*p && (c = *p++) != '\n' && q < &line[sizeof(line) - 4]) 1663 q = vis(q, c, 0, 0); 1664 1665 logline(pri, flags, LocalHostName, line); 1666 } 1667 } 1668 1669 void 1670 vlogmsg(int pri, const char *proc, const char *fmt, va_list ap) 1671 { 1672 char msg[ERRBUFSIZE]; 1673 int l; 1674 1675 l = snprintf(msg, sizeof(msg), "%s[%d]: ", proc, getpid()); 1676 if (l < 0 || l >= sizeof(msg)) 1677 l = 0; 1678 l = vsnprintf(msg + l, sizeof(msg) - l, fmt, ap); 1679 if (l < 0) 1680 strlcpy(msg, fmt, sizeof(msg)); 1681 1682 if (!Started) { 1683 fprintf(stderr, "%s\n", msg); 1684 init_dropped++; 1685 return; 1686 } 1687 logline(pri, ADDDATE, LocalHostName, msg); 1688 } 1689 1690 struct timeval now; 1691 1692 /* 1693 * Log a message to the appropriate log files, users, etc. based on 1694 * the priority. 1695 */ 1696 void 1697 logline(int pri, int flags, char *from, char *msg) 1698 { 1699 struct filed *f; 1700 int fac, msglen, prilev, i; 1701 char timestamp[33]; 1702 char prog[NAME_MAX+1]; 1703 1704 log_debug("logline: pri 0%o, flags 0x%x, from %s, msg %s", 1705 pri, flags, from, msg); 1706 1707 /* 1708 * Check to see if msg looks non-standard. 1709 */ 1710 timestamp[0] = '\0'; 1711 msglen = strlen(msg); 1712 if ((flags & ADDDATE) == 0) { 1713 if (msglen >= 16 && msg[3] == ' ' && msg[6] == ' ' && 1714 msg[9] == ':' && msg[12] == ':' && msg[15] == ' ') { 1715 /* BSD syslog TIMESTAMP, RFC 3164 */ 1716 strlcpy(timestamp, msg, 16); 1717 msg += 16; 1718 msglen -= 16; 1719 if (ZuluTime) 1720 flags |= ADDDATE; 1721 } else if (msglen >= 20 && 1722 isdigit(msg[0]) && isdigit(msg[1]) && isdigit(msg[2]) && 1723 isdigit(msg[3]) && msg[4] == '-' && 1724 isdigit(msg[5]) && isdigit(msg[6]) && msg[7] == '-' && 1725 isdigit(msg[8]) && isdigit(msg[9]) && msg[10] == 'T' && 1726 isdigit(msg[11]) && isdigit(msg[12]) && msg[13] == ':' && 1727 isdigit(msg[14]) && isdigit(msg[15]) && msg[16] == ':' && 1728 isdigit(msg[17]) && isdigit(msg[18]) && (msg[19] == '.' || 1729 msg[19] == 'Z' || msg[19] == '+' || msg[19] == '-')) { 1730 /* FULL-DATE "T" FULL-TIME, RFC 5424 */ 1731 strlcpy(timestamp, msg, sizeof(timestamp)); 1732 msg += 19; 1733 msglen -= 19; 1734 i = 0; 1735 if (msglen >= 3 && msg[0] == '.' && isdigit(msg[1])) { 1736 /* TIME-SECFRAC */ 1737 msg += 2; 1738 msglen -= 2; 1739 i += 2; 1740 while(i < 7 && msglen >= 1 && isdigit(msg[0])) { 1741 msg++; 1742 msglen--; 1743 i++; 1744 } 1745 } 1746 if (msglen >= 2 && msg[0] == 'Z' && msg[1] == ' ') { 1747 /* "Z" */ 1748 timestamp[20+i] = '\0'; 1749 msg += 2; 1750 msglen -= 2; 1751 } else if (msglen >= 7 && 1752 (msg[0] == '+' || msg[0] == '-') && 1753 isdigit(msg[1]) && isdigit(msg[2]) && 1754 msg[3] == ':' && 1755 isdigit(msg[4]) && isdigit(msg[5]) && 1756 msg[6] == ' ') { 1757 /* TIME-NUMOFFSET */ 1758 timestamp[25+i] = '\0'; 1759 msg += 7; 1760 msglen -= 7; 1761 } else { 1762 /* invalid time format, roll back */ 1763 timestamp[0] = '\0'; 1764 msg -= 19 + i; 1765 msglen += 19 + i; 1766 flags |= ADDDATE; 1767 } 1768 } else if (msglen >= 2 && msg[0] == '-' && msg[1] == ' ') { 1769 /* NILVALUE, RFC 5424 */ 1770 msg += 2; 1771 msglen -= 2; 1772 flags |= ADDDATE; 1773 } else 1774 flags |= ADDDATE; 1775 } 1776 1777 (void)gettimeofday(&now, NULL); 1778 if (flags & ADDDATE) { 1779 if (ZuluTime) { 1780 struct tm *tm; 1781 size_t l; 1782 1783 tm = gmtime(&now.tv_sec); 1784 l = strftime(timestamp, sizeof(timestamp), "%FT%T", tm); 1785 /* 1786 * Use only millisecond precision as some time has 1787 * passed since syslog(3) was called. 1788 */ 1789 snprintf(timestamp + l, sizeof(timestamp) - l, 1790 ".%03ldZ", now.tv_usec / 1000); 1791 } else 1792 strlcpy(timestamp, ctime(&now.tv_sec) + 4, 16); 1793 } 1794 1795 /* extract facility and priority level */ 1796 if (flags & MARK) 1797 fac = LOG_NFACILITIES; 1798 else { 1799 fac = LOG_FAC(pri); 1800 if (fac >= LOG_NFACILITIES || fac < 0) 1801 fac = LOG_USER; 1802 } 1803 prilev = LOG_PRI(pri); 1804 1805 /* extract program name */ 1806 while (isspace((unsigned char)*msg)) { 1807 msg++; 1808 msglen--; 1809 } 1810 for (i = 0; i < NAME_MAX; i++) { 1811 if (!isalnum((unsigned char)msg[i]) && 1812 msg[i] != '-' && msg[i] != '.' && msg[i] != '_') 1813 break; 1814 prog[i] = msg[i]; 1815 } 1816 prog[i] = 0; 1817 1818 /* log the message to the particular outputs */ 1819 if (!Initialized) { 1820 f = &consfile; 1821 if (f->f_type == F_CONSOLE) { 1822 strlcpy(f->f_lasttime, timestamp, 1823 sizeof(f->f_lasttime)); 1824 strlcpy(f->f_prevhost, from, 1825 sizeof(f->f_prevhost)); 1826 fprintlog(f, flags, msg); 1827 /* May be set to F_UNUSED, try again next time. */ 1828 f->f_type = F_CONSOLE; 1829 } 1830 init_dropped++; 1831 return; 1832 } 1833 SIMPLEQ_FOREACH(f, &Files, f_next) { 1834 /* skip messages that are incorrect priority */ 1835 if (f->f_pmask[fac] < prilev || 1836 f->f_pmask[fac] == INTERNAL_NOPRI) 1837 continue; 1838 1839 /* skip messages with the incorrect program or hostname */ 1840 if (f->f_program && fnmatch(f->f_program, prog, 0) != 0) 1841 continue; 1842 if (f->f_hostname && fnmatch(f->f_hostname, from, 0) != 0) 1843 continue; 1844 1845 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1846 continue; 1847 1848 /* don't output marks to recently written files */ 1849 if ((flags & MARK) && 1850 (now.tv_sec - f->f_time) < MarkInterval / 2) 1851 continue; 1852 1853 /* 1854 * suppress duplicate lines to this file 1855 */ 1856 if ((Repeat == 0 || (Repeat == 1 && 1857 (f->f_type != F_PIPE && f->f_type != F_FORWUDP && 1858 f->f_type != F_FORWTCP && f->f_type != F_FORWTLS))) && 1859 (flags & MARK) == 0 && msglen == f->f_prevlen && 1860 !strcmp(msg, f->f_prevline) && 1861 !strcmp(from, f->f_prevhost)) { 1862 strlcpy(f->f_lasttime, timestamp, 1863 sizeof(f->f_lasttime)); 1864 f->f_prevcount++; 1865 log_debug("msg repeated %d times, %ld sec of %d", 1866 f->f_prevcount, (long)(now.tv_sec - f->f_time), 1867 repeatinterval[f->f_repeatcount]); 1868 /* 1869 * If domark would have logged this by now, 1870 * flush it now (so we don't hold isolated messages), 1871 * but back off so we'll flush less often 1872 * in the future. 1873 */ 1874 if (now.tv_sec > REPEATTIME(f)) { 1875 fprintlog(f, flags, (char *)NULL); 1876 BACKOFF(f); 1877 } 1878 } else { 1879 /* new line, save it */ 1880 if (f->f_prevcount) 1881 fprintlog(f, 0, (char *)NULL); 1882 f->f_repeatcount = 0; 1883 f->f_prevpri = pri; 1884 strlcpy(f->f_lasttime, timestamp, 1885 sizeof(f->f_lasttime)); 1886 strlcpy(f->f_prevhost, from, 1887 sizeof(f->f_prevhost)); 1888 if (msglen < MAXSVLINE) { 1889 f->f_prevlen = msglen; 1890 strlcpy(f->f_prevline, msg, 1891 sizeof(f->f_prevline)); 1892 fprintlog(f, flags, (char *)NULL); 1893 } else { 1894 f->f_prevline[0] = 0; 1895 f->f_prevlen = 0; 1896 fprintlog(f, flags, msg); 1897 } 1898 } 1899 1900 if (f->f_quick) 1901 break; 1902 } 1903 } 1904 1905 void 1906 fprintlog(struct filed *f, int flags, char *msg) 1907 { 1908 struct iovec iov[6]; 1909 struct iovec *v; 1910 int l, retryonce; 1911 char line[LOG_MAXLINE + 1], repbuf[80], greetings[500]; 1912 char ebuf[ERRBUFSIZE]; 1913 1914 v = iov; 1915 if (f->f_type == F_WALL) { 1916 l = snprintf(greetings, sizeof(greetings), 1917 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1918 f->f_prevhost, ctime(&now.tv_sec)); 1919 if (l < 0) 1920 l = strlcpy(greetings, 1921 "\r\n\7Message from syslogd ...\r\n", 1922 sizeof(greetings)); 1923 if (l >= sizeof(greetings)) 1924 l = sizeof(greetings) - 1; 1925 v->iov_base = greetings; 1926 v->iov_len = l; 1927 v++; 1928 v->iov_base = ""; 1929 v->iov_len = 0; 1930 v++; 1931 } else if (f->f_lasttime[0] != '\0') { 1932 v->iov_base = f->f_lasttime; 1933 v->iov_len = strlen(f->f_lasttime); 1934 v++; 1935 v->iov_base = " "; 1936 v->iov_len = 1; 1937 v++; 1938 } else { 1939 v->iov_base = ""; 1940 v->iov_len = 0; 1941 v++; 1942 v->iov_base = ""; 1943 v->iov_len = 0; 1944 v++; 1945 } 1946 if (f->f_prevhost[0] != '\0') { 1947 v->iov_base = f->f_prevhost; 1948 v->iov_len = strlen(v->iov_base); 1949 v++; 1950 v->iov_base = " "; 1951 v->iov_len = 1; 1952 v++; 1953 } else { 1954 v->iov_base = ""; 1955 v->iov_len = 0; 1956 v++; 1957 v->iov_base = ""; 1958 v->iov_len = 0; 1959 v++; 1960 } 1961 1962 if (msg) { 1963 v->iov_base = msg; 1964 v->iov_len = strlen(msg); 1965 } else if (f->f_prevcount > 1) { 1966 l = snprintf(repbuf, sizeof(repbuf), 1967 "last message repeated %d times", f->f_prevcount); 1968 if (l < 0) 1969 l = strlcpy(repbuf, "last message repeated", 1970 sizeof(repbuf)); 1971 if (l >= sizeof(repbuf)) 1972 l = sizeof(repbuf) - 1; 1973 v->iov_base = repbuf; 1974 v->iov_len = l; 1975 } else { 1976 v->iov_base = f->f_prevline; 1977 v->iov_len = f->f_prevlen; 1978 } 1979 v++; 1980 1981 log_debugadd("Logging to %s", TypeNames[f->f_type]); 1982 f->f_time = now.tv_sec; 1983 1984 switch (f->f_type) { 1985 case F_UNUSED: 1986 log_debug("%s", ""); 1987 break; 1988 1989 case F_FORWUDP: 1990 log_debug(" %s", f->f_un.f_forw.f_loghost); 1991 l = snprintf(line, MINIMUM(MAX_UDPMSG + 1, sizeof(line)), 1992 "<%d>%.32s %s%s%s", f->f_prevpri, (char *)iov[0].iov_base, 1993 IncludeHostname ? LocalHostName : "", 1994 IncludeHostname ? " " : "", 1995 (char *)iov[4].iov_base); 1996 if (l < 0) 1997 l = strlcpy(line, iov[4].iov_base, sizeof(line)); 1998 if (l >= sizeof(line)) 1999 l = sizeof(line) - 1; 2000 if (l >= MAX_UDPMSG + 1) 2001 l = MAX_UDPMSG; 2002 if (sendto(f->f_file, line, l, 0, 2003 (struct sockaddr *)&f->f_un.f_forw.f_addr, 2004 f->f_un.f_forw.f_addr.ss_len) != l) { 2005 switch (errno) { 2006 case EADDRNOTAVAIL: 2007 case EHOSTDOWN: 2008 case EHOSTUNREACH: 2009 case ENETDOWN: 2010 case ENETUNREACH: 2011 case ENOBUFS: 2012 case EWOULDBLOCK: 2013 /* silently dropped */ 2014 break; 2015 default: 2016 f->f_type = F_UNUSED; 2017 log_warn("sendto \"%s\"", 2018 f->f_un.f_forw.f_loghost); 2019 break; 2020 } 2021 } 2022 break; 2023 2024 case F_FORWTCP: 2025 case F_FORWTLS: 2026 log_debugadd(" %s", f->f_un.f_forw.f_loghost); 2027 if (EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->output) >= 2028 MAX_TCPBUF) { 2029 log_debug(" (dropped)"); 2030 f->f_dropped++; 2031 break; 2032 } 2033 /* 2034 * Syslog over TLS RFC 5425 4.3. Sending Data 2035 * Syslog over TCP RFC 6587 3.4.1. Octet Counting 2036 * Use an additional '\n' to split messages. This allows 2037 * buffer synchronisation, helps legacy implementations, 2038 * and makes line based testing easier. 2039 */ 2040 l = snprintf(line, sizeof(line), "<%d>%.32s %s%s\n", 2041 f->f_prevpri, (char *)iov[0].iov_base, 2042 IncludeHostname ? LocalHostName : "", 2043 IncludeHostname ? " " : ""); 2044 if (l < 0) { 2045 log_debug(" (dropped snprintf)"); 2046 f->f_dropped++; 2047 break; 2048 } 2049 l = evbuffer_add_printf(f->f_un.f_forw.f_bufev->output, 2050 "%zu <%d>%.32s %s%s%s\n", 2051 (size_t)l + strlen(iov[4].iov_base), 2052 f->f_prevpri, (char *)iov[0].iov_base, 2053 IncludeHostname ? LocalHostName : "", 2054 IncludeHostname ? " " : "", 2055 (char *)iov[4].iov_base); 2056 if (l < 0) { 2057 log_debug(" (dropped evbuffer_add_printf)"); 2058 f->f_dropped++; 2059 break; 2060 } 2061 bufferevent_enable(f->f_un.f_forw.f_bufev, EV_WRITE); 2062 log_debug("%s", ""); 2063 break; 2064 2065 case F_CONSOLE: 2066 if (flags & IGN_CONS) { 2067 log_debug(" (ignored)"); 2068 break; 2069 } 2070 /* FALLTHROUGH */ 2071 2072 case F_TTY: 2073 case F_FILE: 2074 case F_PIPE: 2075 log_debug(" %s", f->f_un.f_fname); 2076 if (f->f_type != F_FILE && f->f_type != F_PIPE) { 2077 v->iov_base = "\r\n"; 2078 v->iov_len = 2; 2079 } else { 2080 v->iov_base = "\n"; 2081 v->iov_len = 1; 2082 } 2083 retryonce = 0; 2084 again: 2085 if (writev(f->f_file, iov, 6) == -1) { 2086 int e = errno; 2087 2088 /* allow to recover from file system full */ 2089 if (e == ENOSPC && f->f_type == F_FILE) { 2090 if (f->f_dropped++ == 0) { 2091 f->f_type = F_UNUSED; 2092 errno = e; 2093 log_warn("write to file \"%s\"", 2094 f->f_un.f_fname); 2095 f->f_type = F_FILE; 2096 } 2097 break; 2098 } 2099 2100 /* pipe is non-blocking. log and drop message if full */ 2101 if (e == EAGAIN && f->f_type == F_PIPE) { 2102 if (now.tv_sec - f->f_lasterrtime > 120) { 2103 f->f_lasterrtime = now.tv_sec; 2104 log_warn("write to pipe \"%s\"", 2105 f->f_un.f_fname); 2106 } 2107 break; 2108 } 2109 2110 /* 2111 * Check for errors on TTY's or program pipes. 2112 * Errors happen due to loss of tty or died programs. 2113 */ 2114 if (e == EAGAIN) { 2115 /* 2116 * Silently drop messages on blocked write. 2117 * This can happen when logging to a locked tty. 2118 */ 2119 break; 2120 } 2121 2122 (void)close(f->f_file); 2123 if ((e == EIO || e == EBADF) && 2124 f->f_type != F_FILE && f->f_type != F_PIPE && 2125 !retryonce) { 2126 f->f_file = priv_open_tty(f->f_un.f_fname); 2127 retryonce = 1; 2128 if (f->f_file < 0) { 2129 f->f_type = F_UNUSED; 2130 log_warn("priv_open_tty \"%s\"", 2131 f->f_un.f_fname); 2132 } else 2133 goto again; 2134 } else if ((e == EPIPE || e == EBADF) && 2135 f->f_type == F_PIPE && !retryonce) { 2136 f->f_file = priv_open_log(f->f_un.f_fname); 2137 retryonce = 1; 2138 if (f->f_file < 0) { 2139 f->f_type = F_UNUSED; 2140 log_warn("priv_open_log \"%s\"", 2141 f->f_un.f_fname); 2142 } else 2143 goto again; 2144 } else { 2145 f->f_type = F_UNUSED; 2146 f->f_file = -1; 2147 errno = e; 2148 log_warn("writev \"%s\"", f->f_un.f_fname); 2149 } 2150 } else { 2151 if (flags & SYNC_FILE) 2152 (void)fsync(f->f_file); 2153 if (f->f_dropped && f->f_type == F_FILE) { 2154 snprintf(ebuf, sizeof(ebuf), "to file \"%s\"", 2155 f->f_un.f_fname); 2156 dropped_warn(&f->f_dropped, ebuf); 2157 } 2158 } 2159 break; 2160 2161 case F_USERS: 2162 case F_WALL: 2163 log_debug("%s", ""); 2164 v->iov_base = "\r\n"; 2165 v->iov_len = 2; 2166 wallmsg(f, iov); 2167 break; 2168 2169 case F_MEMBUF: 2170 log_debug("%s", ""); 2171 l = snprintf(line, sizeof(line), "%.32s %s %s", 2172 (char *)iov[0].iov_base, (char *)iov[2].iov_base, 2173 (char *)iov[4].iov_base); 2174 if (l < 0) 2175 l = strlcpy(line, iov[4].iov_base, sizeof(line)); 2176 if (ringbuf_append_line(f->f_un.f_mb.f_rb, line) == 1) 2177 f->f_un.f_mb.f_overflow = 1; 2178 if (f->f_un.f_mb.f_attached) 2179 ctlconn_logto(line); 2180 break; 2181 } 2182 f->f_prevcount = 0; 2183 } 2184 2185 /* 2186 * WALLMSG -- Write a message to the world at large 2187 * 2188 * Write the specified message to either the entire 2189 * world, or a list of approved users. 2190 */ 2191 void 2192 wallmsg(struct filed *f, struct iovec *iov) 2193 { 2194 struct utmp ut; 2195 char utline[sizeof(ut.ut_line) + 1]; 2196 static int reenter; /* avoid calling ourselves */ 2197 FILE *uf; 2198 int i; 2199 2200 if (reenter++) 2201 return; 2202 if ((uf = priv_open_utmp()) == NULL) { 2203 log_warn("priv_open_utmp"); 2204 reenter = 0; 2205 return; 2206 } 2207 while (fread(&ut, sizeof(ut), 1, uf) == 1) { 2208 if (ut.ut_name[0] == '\0') 2209 continue; 2210 /* must use strncpy since ut_* may not be NUL terminated */ 2211 strncpy(utline, ut.ut_line, sizeof(utline) - 1); 2212 utline[sizeof(utline) - 1] = '\0'; 2213 if (f->f_type == F_WALL) { 2214 ttymsg(iov, 6, utline); 2215 continue; 2216 } 2217 /* should we send the message to this user? */ 2218 for (i = 0; i < MAXUNAMES; i++) { 2219 if (!f->f_un.f_uname[i][0]) 2220 break; 2221 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 2222 UT_NAMESIZE)) { 2223 ttymsg(iov, 6, utline); 2224 break; 2225 } 2226 } 2227 } 2228 (void)fclose(uf); 2229 reenter = 0; 2230 } 2231 2232 /* 2233 * Return a printable representation of a host address. 2234 */ 2235 void 2236 cvthname(struct sockaddr *f, char *result, size_t res_len) 2237 { 2238 if (getnameinfo(f, f->sa_len, result, res_len, NULL, 0, 2239 NI_NUMERICHOST|NI_NUMERICSERV|NI_DGRAM) != 0) { 2240 log_debug("Malformed from address"); 2241 strlcpy(result, hostname_unknown, res_len); 2242 return; 2243 } 2244 log_debug("cvthname(%s)", result); 2245 if (NoDNS) 2246 return; 2247 2248 if (priv_getnameinfo(f, f->sa_len, result, res_len) != 0) 2249 log_debug("Host name for from address (%s) unknown", result); 2250 } 2251 2252 void 2253 die_signalcb(int signum, short event, void *arg) 2254 { 2255 die(signum); 2256 } 2257 2258 void 2259 mark_timercb(int unused, short event, void *arg) 2260 { 2261 struct event *ev = arg; 2262 struct timeval to; 2263 2264 markit(); 2265 2266 to.tv_sec = TIMERINTVL; 2267 to.tv_usec = 0; 2268 evtimer_add(ev, &to); 2269 } 2270 2271 void 2272 init_signalcb(int signum, short event, void *arg) 2273 { 2274 init(); 2275 log_info(LOG_INFO, "restart"); 2276 2277 dropped_warn(&file_dropped, "to file"); 2278 dropped_warn(&tcpbuf_dropped, "to remote loghost"); 2279 log_debug("syslogd: restarted"); 2280 } 2281 2282 void 2283 logevent(int severity, const char *msg) 2284 { 2285 log_debug("libevent: [%d] %s", severity, msg); 2286 } 2287 2288 void 2289 dropped_warn(int *count, const char *what) 2290 { 2291 int dropped; 2292 2293 if (*count == 0) 2294 return; 2295 2296 dropped = *count; 2297 *count = 0; 2298 log_info(LOG_WARNING, "dropped %d message%s %s", 2299 dropped, dropped == 1 ? "" : "s", what); 2300 } 2301 2302 __dead void 2303 die(int signo) 2304 { 2305 struct filed *f; 2306 2307 SIMPLEQ_FOREACH(f, &Files, f_next) { 2308 /* flush any pending output */ 2309 if (f->f_prevcount) 2310 fprintlog(f, 0, (char *)NULL); 2311 if (f->f_type == F_FORWTLS || f->f_type == F_FORWTCP) { 2312 tcpbuf_dropped += f->f_dropped + 2313 tcpbuf_countmsg(f->f_un.f_forw.f_bufev); 2314 f->f_dropped = 0; 2315 } 2316 if (f->f_type == F_FILE) { 2317 file_dropped += f->f_dropped; 2318 f->f_dropped = 0; 2319 } 2320 } 2321 dropped_warn(&init_dropped, "during initialization"); 2322 dropped_warn(&file_dropped, "to file"); 2323 dropped_warn(&tcpbuf_dropped, "to remote loghost"); 2324 2325 if (signo) 2326 log_info(LOG_ERR, "exiting on signal %d", signo); 2327 log_debug("syslogd: exited"); 2328 exit(0); 2329 } 2330 2331 /* 2332 * INIT -- Initialize syslogd from configuration table 2333 */ 2334 void 2335 init(void) 2336 { 2337 char progblock[NAME_MAX+1], hostblock[NAME_MAX+1], *cline, *p, *q; 2338 struct filed_list mb; 2339 struct filed *f, *m; 2340 FILE *cf; 2341 int i; 2342 size_t s; 2343 2344 log_debug("init"); 2345 2346 /* If config file has been modified, then just die to restart */ 2347 if (priv_config_modified()) { 2348 log_debug("config file changed: dying"); 2349 die(0); 2350 } 2351 2352 /* 2353 * Close all open log files. 2354 */ 2355 Initialized = 0; 2356 SIMPLEQ_INIT(&mb); 2357 while (!SIMPLEQ_EMPTY(&Files)) { 2358 f = SIMPLEQ_FIRST(&Files); 2359 SIMPLEQ_REMOVE_HEAD(&Files, f_next); 2360 /* flush any pending output */ 2361 if (f->f_prevcount) 2362 fprintlog(f, 0, (char *)NULL); 2363 2364 switch (f->f_type) { 2365 case F_FORWTLS: 2366 if (f->f_un.f_forw.f_ctx) { 2367 tls_close(f->f_un.f_forw.f_ctx); 2368 tls_free(f->f_un.f_forw.f_ctx); 2369 } 2370 free(f->f_un.f_forw.f_host); 2371 /* FALLTHROUGH */ 2372 case F_FORWTCP: 2373 tcpbuf_dropped += f->f_dropped + 2374 tcpbuf_countmsg(f->f_un.f_forw.f_bufev); 2375 bufferevent_free(f->f_un.f_forw.f_bufev); 2376 /* FALLTHROUGH */ 2377 case F_FILE: 2378 if (f->f_type == F_FILE) { 2379 file_dropped += f->f_dropped; 2380 f->f_dropped = 0; 2381 } 2382 case F_TTY: 2383 case F_CONSOLE: 2384 case F_PIPE: 2385 (void)close(f->f_file); 2386 break; 2387 } 2388 free(f->f_program); 2389 free(f->f_hostname); 2390 if (f->f_type == F_MEMBUF) { 2391 f->f_program = NULL; 2392 f->f_hostname = NULL; 2393 log_debug("add %p to mb", f); 2394 SIMPLEQ_INSERT_HEAD(&mb, f, f_next); 2395 } else 2396 free(f); 2397 } 2398 SIMPLEQ_INIT(&Files); 2399 2400 /* open the configuration file */ 2401 if ((cf = priv_open_config()) == NULL) { 2402 log_debug("cannot open %s", ConfFile); 2403 SIMPLEQ_INSERT_TAIL(&Files, 2404 cfline("*.ERR\t/dev/console", "*", "*"), f_next); 2405 SIMPLEQ_INSERT_TAIL(&Files, 2406 cfline("*.PANIC\t*", "*", "*"), f_next); 2407 Initialized = 1; 2408 dropped_warn(&init_dropped, "during initialization"); 2409 return; 2410 } 2411 2412 /* 2413 * Foreach line in the conf table, open that file. 2414 */ 2415 cline = NULL; 2416 s = 0; 2417 strlcpy(progblock, "*", sizeof(progblock)); 2418 strlcpy(hostblock, "*", sizeof(hostblock)); 2419 while (getline(&cline, &s, cf) != -1) { 2420 /* 2421 * check for end-of-section, comments, strip off trailing 2422 * spaces and newline character. !progblock and +hostblock 2423 * are treated specially: the following lines apply only to 2424 * that program. 2425 */ 2426 for (p = cline; isspace((unsigned char)*p); ++p) 2427 continue; 2428 if (*p == '\0' || *p == '#') 2429 continue; 2430 if (*p == '!' || *p == '+') { 2431 q = (*p == '!') ? progblock : hostblock; 2432 p++; 2433 while (isspace((unsigned char)*p)) 2434 p++; 2435 if (*p == '\0' || (*p == '*' && (p[1] == '\0' || 2436 isspace((unsigned char)p[1])))) { 2437 strlcpy(q, "*", NAME_MAX+1); 2438 continue; 2439 } 2440 for (i = 0; i < NAME_MAX; i++) { 2441 if (*p == '\0' || isspace((unsigned char)*p)) 2442 break; 2443 *q++ = *p++; 2444 } 2445 *q = '\0'; 2446 continue; 2447 } 2448 2449 p = cline + strlen(cline); 2450 while (p > cline) 2451 if (!isspace((unsigned char)*--p)) { 2452 p++; 2453 break; 2454 } 2455 *p = '\0'; 2456 f = cfline(cline, progblock, hostblock); 2457 if (f != NULL) 2458 SIMPLEQ_INSERT_TAIL(&Files, f, f_next); 2459 } 2460 free(cline); 2461 if (!feof(cf)) 2462 fatal("read config file"); 2463 2464 /* Match and initialize the memory buffers */ 2465 SIMPLEQ_FOREACH(f, &Files, f_next) { 2466 if (f->f_type != F_MEMBUF) 2467 continue; 2468 log_debug("Initialize membuf %s at %p", 2469 f->f_un.f_mb.f_mname, f); 2470 2471 SIMPLEQ_FOREACH(m, &mb, f_next) { 2472 if (m->f_un.f_mb.f_rb == NULL) 2473 continue; 2474 if (strcmp(m->f_un.f_mb.f_mname, 2475 f->f_un.f_mb.f_mname) == 0) 2476 break; 2477 } 2478 if (m == NULL) { 2479 log_debug("Membuf no match"); 2480 f->f_un.f_mb.f_rb = ringbuf_init(f->f_un.f_mb.f_len); 2481 if (f->f_un.f_mb.f_rb == NULL) { 2482 f->f_type = F_UNUSED; 2483 log_warn("allocate membuf"); 2484 } 2485 } else { 2486 log_debug("Membuf match f:%p, m:%p", f, m); 2487 f->f_un = m->f_un; 2488 m->f_un.f_mb.f_rb = NULL; 2489 } 2490 } 2491 2492 /* make sure remaining buffers are freed */ 2493 while (!SIMPLEQ_EMPTY(&mb)) { 2494 m = SIMPLEQ_FIRST(&mb); 2495 SIMPLEQ_REMOVE_HEAD(&mb, f_next); 2496 if (m->f_un.f_mb.f_rb != NULL) { 2497 log_warnx("mismatched membuf"); 2498 ringbuf_free(m->f_un.f_mb.f_rb); 2499 } 2500 log_debug("Freeing membuf %p", m); 2501 2502 free(m); 2503 } 2504 2505 /* close the configuration file */ 2506 (void)fclose(cf); 2507 2508 Initialized = 1; 2509 dropped_warn(&init_dropped, "during initialization"); 2510 2511 if (Debug) { 2512 SIMPLEQ_FOREACH(f, &Files, f_next) { 2513 for (i = 0; i <= LOG_NFACILITIES; i++) 2514 if (f->f_pmask[i] == INTERNAL_NOPRI) 2515 printf("X "); 2516 else 2517 printf("%d ", f->f_pmask[i]); 2518 printf("%s: ", TypeNames[f->f_type]); 2519 switch (f->f_type) { 2520 case F_FILE: 2521 case F_TTY: 2522 case F_CONSOLE: 2523 case F_PIPE: 2524 printf("%s", f->f_un.f_fname); 2525 break; 2526 2527 case F_FORWUDP: 2528 case F_FORWTCP: 2529 case F_FORWTLS: 2530 printf("%s", f->f_un.f_forw.f_loghost); 2531 break; 2532 2533 case F_USERS: 2534 for (i = 0; i < MAXUNAMES && 2535 *f->f_un.f_uname[i]; i++) 2536 printf("%s, ", f->f_un.f_uname[i]); 2537 break; 2538 2539 case F_MEMBUF: 2540 printf("%s", f->f_un.f_mb.f_mname); 2541 break; 2542 2543 } 2544 if (f->f_program || f->f_hostname) 2545 printf(" (%s, %s)", 2546 f->f_program ? f->f_program : "*", 2547 f->f_hostname ? f->f_hostname : "*"); 2548 printf("\n"); 2549 } 2550 } 2551 } 2552 2553 #define progmatches(p1, p2) \ 2554 (p1 == p2 || (p1 != NULL && p2 != NULL && strcmp(p1, p2) == 0)) 2555 2556 /* 2557 * Spot a line with a duplicate file, pipe, console, tty, or membuf target. 2558 */ 2559 struct filed * 2560 find_dup(struct filed *f) 2561 { 2562 struct filed *list; 2563 2564 SIMPLEQ_FOREACH(list, &Files, f_next) { 2565 if (list->f_quick || f->f_quick) 2566 continue; 2567 switch (list->f_type) { 2568 case F_FILE: 2569 case F_TTY: 2570 case F_CONSOLE: 2571 case F_PIPE: 2572 if (strcmp(list->f_un.f_fname, f->f_un.f_fname) == 0 && 2573 progmatches(list->f_program, f->f_program) && 2574 progmatches(list->f_hostname, f->f_hostname)) { 2575 log_debug("duplicate %s", f->f_un.f_fname); 2576 return (list); 2577 } 2578 break; 2579 case F_MEMBUF: 2580 if (strcmp(list->f_un.f_mb.f_mname, 2581 f->f_un.f_mb.f_mname) == 0 && 2582 progmatches(list->f_program, f->f_program) && 2583 progmatches(list->f_hostname, f->f_hostname)) { 2584 log_debug("duplicate membuf %s", 2585 f->f_un.f_mb.f_mname); 2586 return (list); 2587 } 2588 break; 2589 } 2590 } 2591 return (NULL); 2592 } 2593 2594 /* 2595 * Crack a configuration file line 2596 */ 2597 struct filed * 2598 cfline(char *line, char *progblock, char *hostblock) 2599 { 2600 int i, pri; 2601 size_t rb_len; 2602 char *bp, *p, *q, *proto, *host, *port, *ipproto; 2603 char buf[LOG_MAXLINE]; 2604 struct filed *xf, *f, *d; 2605 struct timeval to; 2606 2607 log_debug("cfline(\"%s\", f, \"%s\", \"%s\")", 2608 line, progblock, hostblock); 2609 2610 if ((f = calloc(1, sizeof(*f))) == NULL) 2611 fatal("allocate struct filed"); 2612 for (i = 0; i <= LOG_NFACILITIES; i++) 2613 f->f_pmask[i] = INTERNAL_NOPRI; 2614 2615 /* save program name if any */ 2616 f->f_quick = 0; 2617 if (*progblock == '!') { 2618 progblock++; 2619 f->f_quick = 1; 2620 } 2621 if (*hostblock == '+') { 2622 hostblock++; 2623 f->f_quick = 1; 2624 } 2625 if (strcmp(progblock, "*") != 0) 2626 f->f_program = strdup(progblock); 2627 if (strcmp(hostblock, "*") != 0) 2628 f->f_hostname = strdup(hostblock); 2629 2630 /* scan through the list of selectors */ 2631 for (p = line; *p && *p != '\t' && *p != ' ';) { 2632 2633 /* find the end of this facility name list */ 2634 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2635 continue; 2636 2637 /* collect priority name */ 2638 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2639 *bp++ = *q++; 2640 *bp = '\0'; 2641 2642 /* skip cruft */ 2643 while (*q && strchr(",;", *q)) 2644 q++; 2645 2646 /* decode priority name */ 2647 if (*buf == '*') 2648 pri = LOG_PRIMASK + 1; 2649 else { 2650 /* ignore trailing spaces */ 2651 for (i=strlen(buf)-1; i >= 0 && buf[i] == ' '; i--) { 2652 buf[i]='\0'; 2653 } 2654 2655 pri = decode(buf, prioritynames); 2656 if (pri < 0) { 2657 log_warnx("unknown priority name \"%s\"", buf); 2658 free(f); 2659 return (NULL); 2660 } 2661 } 2662 2663 /* scan facilities */ 2664 while (*p && !strchr("\t.; ", *p)) { 2665 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2666 *bp++ = *p++; 2667 *bp = '\0'; 2668 if (*buf == '*') 2669 for (i = 0; i < LOG_NFACILITIES; i++) 2670 f->f_pmask[i] = pri; 2671 else { 2672 i = decode(buf, facilitynames); 2673 if (i < 0) { 2674 log_warnx("unknown facility name " 2675 "\"%s\"", buf); 2676 free(f); 2677 return (NULL); 2678 } 2679 f->f_pmask[i >> 3] = pri; 2680 } 2681 while (*p == ',' || *p == ' ') 2682 p++; 2683 } 2684 2685 p = q; 2686 } 2687 2688 /* skip to action part */ 2689 while (*p == '\t' || *p == ' ') 2690 p++; 2691 2692 switch (*p) { 2693 case '@': 2694 if ((strlcpy(f->f_un.f_forw.f_loghost, p, 2695 sizeof(f->f_un.f_forw.f_loghost)) >= 2696 sizeof(f->f_un.f_forw.f_loghost))) { 2697 log_warnx("loghost too long \"%s\"", p); 2698 break; 2699 } 2700 if (loghost_parse(++p, &proto, &host, &port) == -1) { 2701 log_warnx("bad loghost \"%s\"", 2702 f->f_un.f_forw.f_loghost); 2703 break; 2704 } 2705 if (proto == NULL) 2706 proto = "udp"; 2707 ipproto = proto; 2708 if (strcmp(proto, "udp") == 0) { 2709 if (fd_udp == -1) 2710 proto = "udp6"; 2711 if (fd_udp6 == -1) 2712 proto = "udp4"; 2713 ipproto = proto; 2714 } else if (strcmp(proto, "udp4") == 0) { 2715 if (fd_udp == -1) { 2716 log_warnx("no udp4 \"%s\"", 2717 f->f_un.f_forw.f_loghost); 2718 break; 2719 } 2720 } else if (strcmp(proto, "udp6") == 0) { 2721 if (fd_udp6 == -1) { 2722 log_warnx("no udp6 \"%s\"", 2723 f->f_un.f_forw.f_loghost); 2724 break; 2725 } 2726 } else if (strcmp(proto, "tcp") == 0 || 2727 strcmp(proto, "tcp4") == 0 || strcmp(proto, "tcp6") == 0) { 2728 ; 2729 } else if (strcmp(proto, "tls") == 0) { 2730 ipproto = "tcp"; 2731 } else if (strcmp(proto, "tls4") == 0) { 2732 ipproto = "tcp4"; 2733 } else if (strcmp(proto, "tls6") == 0) { 2734 ipproto = "tcp6"; 2735 } else { 2736 log_warnx("bad protocol \"%s\"", 2737 f->f_un.f_forw.f_loghost); 2738 break; 2739 } 2740 if (strlen(host) >= NI_MAXHOST) { 2741 log_warnx("host too long \"%s\"", 2742 f->f_un.f_forw.f_loghost); 2743 break; 2744 } 2745 if (port == NULL) 2746 port = strncmp(proto, "tls", 3) == 0 ? 2747 "syslog-tls" : "syslog"; 2748 if (strlen(port) >= NI_MAXSERV) { 2749 log_warnx("port too long \"%s\"", 2750 f->f_un.f_forw.f_loghost); 2751 break; 2752 } 2753 if (priv_getaddrinfo(ipproto, host, port, 2754 (struct sockaddr*)&f->f_un.f_forw.f_addr, 2755 sizeof(f->f_un.f_forw.f_addr)) != 0) { 2756 log_warnx("bad hostname \"%s\"", 2757 f->f_un.f_forw.f_loghost); 2758 break; 2759 } 2760 f->f_file = -1; 2761 if (strncmp(proto, "udp", 3) == 0) { 2762 switch (f->f_un.f_forw.f_addr.ss_family) { 2763 case AF_INET: 2764 send_udp = 1; 2765 f->f_file = fd_udp; 2766 break; 2767 case AF_INET6: 2768 send_udp6 = 1; 2769 f->f_file = fd_udp6; 2770 break; 2771 } 2772 f->f_type = F_FORWUDP; 2773 } else if (strncmp(ipproto, "tcp", 3) == 0) { 2774 if ((f->f_un.f_forw.f_bufev = bufferevent_new(-1, 2775 tcp_dropcb, tcp_writecb, tcp_errorcb, f)) == NULL) { 2776 log_warn("bufferevent \"%s\"", 2777 f->f_un.f_forw.f_loghost); 2778 break; 2779 } 2780 if (strncmp(proto, "tls", 3) == 0) { 2781 f->f_un.f_forw.f_host = strdup(host); 2782 f->f_type = F_FORWTLS; 2783 } else { 2784 f->f_type = F_FORWTCP; 2785 } 2786 /* 2787 * If we try to connect to a TLS server immediately 2788 * syslogd gets an SIGPIPE as the signal handlers have 2789 * not been set up. Delay the connection until the 2790 * event loop is started. We can reuse the write event 2791 * for that as bufferevent is still disabled. 2792 */ 2793 to.tv_sec = 0; 2794 to.tv_usec = 1; 2795 evtimer_set(&f->f_un.f_forw.f_bufev->ev_write, 2796 tcp_connectcb, f); 2797 evtimer_add(&f->f_un.f_forw.f_bufev->ev_write, &to); 2798 } 2799 break; 2800 2801 case '/': 2802 case '|': 2803 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2804 d = find_dup(f); 2805 if (d != NULL) { 2806 for (i = 0; i <= LOG_NFACILITIES; i++) 2807 if (f->f_pmask[i] != INTERNAL_NOPRI) 2808 d->f_pmask[i] = f->f_pmask[i]; 2809 free(f); 2810 return (NULL); 2811 } 2812 if (strcmp(p, ctty) == 0) { 2813 f->f_file = priv_open_tty(p); 2814 if (f->f_file < 0) 2815 log_warn("priv_open_tty \"%s\"", p); 2816 } else { 2817 f->f_file = priv_open_log(p); 2818 if (f->f_file < 0) 2819 log_warn("priv_open_log \"%s\"", p); 2820 } 2821 if (f->f_file < 0) { 2822 f->f_type = F_UNUSED; 2823 break; 2824 } 2825 if (isatty(f->f_file)) { 2826 if (strcmp(p, ctty) == 0) 2827 f->f_type = F_CONSOLE; 2828 else 2829 f->f_type = F_TTY; 2830 } else { 2831 if (*p == '|') 2832 f->f_type = F_PIPE; 2833 else { 2834 f->f_type = F_FILE; 2835 2836 /* Clear O_NONBLOCK flag on f->f_file */ 2837 if ((i = fcntl(f->f_file, F_GETFL)) != -1) { 2838 i &= ~O_NONBLOCK; 2839 fcntl(f->f_file, F_SETFL, i); 2840 } 2841 } 2842 } 2843 break; 2844 2845 case '*': 2846 f->f_type = F_WALL; 2847 break; 2848 2849 case ':': 2850 f->f_type = F_MEMBUF; 2851 2852 /* Parse buffer size (in kb) */ 2853 errno = 0; 2854 rb_len = strtoul(++p, &q, 0); 2855 if (*p == '\0' || (errno == ERANGE && rb_len == ULONG_MAX) || 2856 *q != ':' || rb_len == 0) { 2857 f->f_type = F_UNUSED; 2858 log_warnx("strtoul \"%s\"", p); 2859 break; 2860 } 2861 q++; 2862 rb_len *= 1024; 2863 2864 /* Copy buffer name */ 2865 for(i = 0; (size_t)i < sizeof(f->f_un.f_mb.f_mname) - 1; i++) { 2866 if (!isalnum((unsigned char)q[i])) 2867 break; 2868 f->f_un.f_mb.f_mname[i] = q[i]; 2869 } 2870 2871 /* Make sure buffer name is unique */ 2872 xf = find_dup(f); 2873 2874 /* Error on missing or non-unique name, or bad buffer length */ 2875 if (i == 0 || rb_len > MAX_MEMBUF || xf != NULL) { 2876 f->f_type = F_UNUSED; 2877 log_warnx("find_dup \"%s\"", p); 2878 break; 2879 } 2880 2881 /* Set buffer length */ 2882 rb_len = MAXIMUM(rb_len, MIN_MEMBUF); 2883 f->f_un.f_mb.f_len = rb_len; 2884 f->f_un.f_mb.f_overflow = 0; 2885 f->f_un.f_mb.f_attached = 0; 2886 break; 2887 2888 default: 2889 for (i = 0; i < MAXUNAMES && *p; i++) { 2890 for (q = p; *q && *q != ','; ) 2891 q++; 2892 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 2893 if ((q - p) > UT_NAMESIZE) 2894 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 2895 else 2896 f->f_un.f_uname[i][q - p] = '\0'; 2897 while (*q == ',' || *q == ' ') 2898 q++; 2899 p = q; 2900 } 2901 f->f_type = F_USERS; 2902 break; 2903 } 2904 return (f); 2905 } 2906 2907 /* 2908 * Parse the host and port parts from a loghost string. 2909 */ 2910 int 2911 loghost_parse(char *str, char **proto, char **host, char **port) 2912 { 2913 char *prefix = NULL; 2914 2915 if ((*host = strchr(str, ':')) && 2916 (*host)[1] == '/' && (*host)[2] == '/') { 2917 prefix = str; 2918 **host = '\0'; 2919 str = *host + 3; 2920 } 2921 if (proto) 2922 *proto = prefix; 2923 else if (prefix) 2924 return (-1); 2925 2926 *host = str; 2927 if (**host == '[') { 2928 (*host)++; 2929 str = strchr(*host, ']'); 2930 if (str == NULL) 2931 return (-1); 2932 *str++ = '\0'; 2933 } 2934 *port = strrchr(str, ':'); 2935 if (*port != NULL) 2936 *(*port)++ = '\0'; 2937 2938 return (0); 2939 } 2940 2941 /* 2942 * Retrieve the size of the kernel message buffer, via sysctl. 2943 */ 2944 int 2945 getmsgbufsize(void) 2946 { 2947 int msgbufsize, mib[2]; 2948 size_t size; 2949 2950 mib[0] = CTL_KERN; 2951 mib[1] = KERN_MSGBUFSIZE; 2952 size = sizeof msgbufsize; 2953 if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) { 2954 log_debug("couldn't get kern.msgbufsize"); 2955 return (0); 2956 } 2957 return (msgbufsize); 2958 } 2959 2960 /* 2961 * Decode a symbolic name to a numeric value 2962 */ 2963 int 2964 decode(const char *name, const CODE *codetab) 2965 { 2966 const CODE *c; 2967 char *p, buf[40]; 2968 2969 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2970 if (isupper((unsigned char)*name)) 2971 *p = tolower((unsigned char)*name); 2972 else 2973 *p = *name; 2974 } 2975 *p = '\0'; 2976 for (c = codetab; c->c_name; c++) 2977 if (!strcmp(buf, c->c_name)) 2978 return (c->c_val); 2979 2980 return (-1); 2981 } 2982 2983 void 2984 markit(void) 2985 { 2986 struct filed *f; 2987 2988 (void)gettimeofday(&now, NULL); 2989 MarkSeq += TIMERINTVL; 2990 if (MarkSeq >= MarkInterval) { 2991 logline(LOG_INFO, ADDDATE|MARK, LocalHostName, "-- MARK --"); 2992 MarkSeq = 0; 2993 } 2994 2995 SIMPLEQ_FOREACH(f, &Files, f_next) { 2996 if (f->f_prevcount && now.tv_sec >= REPEATTIME(f)) { 2997 log_debug("flush %s: repeated %d times, %d sec", 2998 TypeNames[f->f_type], f->f_prevcount, 2999 repeatinterval[f->f_repeatcount]); 3000 fprintlog(f, 0, (char *)NULL); 3001 BACKOFF(f); 3002 } 3003 } 3004 } 3005 3006 int 3007 unix_socket(char *path, int type, mode_t mode) 3008 { 3009 struct sockaddr_un s_un; 3010 int fd, optval; 3011 mode_t old_umask; 3012 3013 memset(&s_un, 0, sizeof(s_un)); 3014 s_un.sun_family = AF_UNIX; 3015 if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >= 3016 sizeof(s_un.sun_path)) { 3017 log_warnx("socket path too long \"%s\"", path); 3018 return (-1); 3019 } 3020 3021 if ((fd = socket(AF_UNIX, type, 0)) == -1) { 3022 log_warn("socket unix \"%s\"", path); 3023 return (-1); 3024 } 3025 3026 if (Debug) { 3027 if (connect(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == 0 || 3028 errno == EPROTOTYPE) { 3029 close(fd); 3030 errno = EISCONN; 3031 log_warn("connect unix \"%s\"", path); 3032 return (-1); 3033 } 3034 } 3035 3036 old_umask = umask(0177); 3037 3038 unlink(path); 3039 if (bind(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) { 3040 log_warn("bind unix \"%s\"", path); 3041 umask(old_umask); 3042 close(fd); 3043 return (-1); 3044 } 3045 3046 umask(old_umask); 3047 3048 if (chmod(path, mode) == -1) { 3049 log_warn("chmod unix \"%s\"", path); 3050 close(fd); 3051 unlink(path); 3052 return (-1); 3053 } 3054 3055 optval = LOG_MAXLINE + PATH_MAX; 3056 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &optval, sizeof(optval)) 3057 == -1) 3058 log_warn("setsockopt unix \"%s\"", path); 3059 3060 return (fd); 3061 } 3062 3063 /* 3064 * Increase socket buffer size in small steps to get partial success 3065 * if we hit a kernel limit. Allow an optional final step. 3066 */ 3067 void 3068 double_sockbuf(int fd, int optname, int bigsize) 3069 { 3070 socklen_t len; 3071 int i, newsize, oldsize = 0; 3072 3073 len = sizeof(oldsize); 3074 if (getsockopt(fd, SOL_SOCKET, optname, &oldsize, &len) == -1) 3075 log_warn("getsockopt bufsize"); 3076 len = sizeof(newsize); 3077 newsize = LOG_MAXLINE + 128; /* data + control */ 3078 /* allow 8 full length messages, that is 66560 bytes */ 3079 for (i = 0; i < 4; i++, newsize *= 2) { 3080 if (newsize <= oldsize) 3081 continue; 3082 if (setsockopt(fd, SOL_SOCKET, optname, &newsize, len) == -1) 3083 log_warn("setsockopt bufsize %d", newsize); 3084 else 3085 oldsize = newsize; 3086 } 3087 if (bigsize && bigsize > oldsize) { 3088 if (setsockopt(fd, SOL_SOCKET, optname, &bigsize, len) == -1) 3089 log_warn("setsockopt bufsize %d", bigsize); 3090 } 3091 } 3092 3093 void 3094 set_sockbuf(int fd) 3095 { 3096 int size = 65536; 3097 3098 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) == -1) 3099 log_warn("setsockopt sndbufsize %d", size); 3100 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)) == -1) 3101 log_warn("setsockopt rcvbufsize %d", size); 3102 } 3103 3104 void 3105 ctlconn_cleanup(void) 3106 { 3107 struct filed *f; 3108 3109 close(fd_ctlconn); 3110 fd_ctlconn = -1; 3111 event_del(ev_ctlread); 3112 event_del(ev_ctlwrite); 3113 event_add(ev_ctlaccept, NULL); 3114 3115 if (ctl_state == CTL_WRITING_CONT_REPLY) 3116 SIMPLEQ_FOREACH(f, &Files, f_next) 3117 if (f->f_type == F_MEMBUF) 3118 f->f_un.f_mb.f_attached = 0; 3119 3120 ctl_state = ctl_cmd_bytes = ctl_reply_offset = ctl_reply_size = 0; 3121 } 3122 3123 void 3124 ctlsock_acceptcb(int fd, short event, void *arg) 3125 { 3126 struct event *ev = arg; 3127 3128 if ((fd = reserve_accept4(fd, event, ev, ctlsock_acceptcb, 3129 NULL, NULL, SOCK_NONBLOCK)) == -1) { 3130 if (errno != ENFILE && errno != EMFILE && 3131 errno != EINTR && errno != EWOULDBLOCK && 3132 errno != ECONNABORTED) 3133 log_warn("accept control socket"); 3134 return; 3135 } 3136 log_debug("Accepting control connection"); 3137 3138 if (fd_ctlconn != -1) 3139 ctlconn_cleanup(); 3140 3141 /* Only one connection at a time */ 3142 event_del(ev); 3143 3144 fd_ctlconn = fd; 3145 /* file descriptor has changed, reset event */ 3146 event_set(ev_ctlread, fd_ctlconn, EV_READ|EV_PERSIST, 3147 ctlconn_readcb, ev_ctlread); 3148 event_set(ev_ctlwrite, fd_ctlconn, EV_WRITE|EV_PERSIST, 3149 ctlconn_writecb, ev_ctlwrite); 3150 event_add(ev_ctlread, NULL); 3151 ctl_state = CTL_READING_CMD; 3152 ctl_cmd_bytes = 0; 3153 } 3154 3155 static struct filed 3156 *find_membuf_log(const char *name) 3157 { 3158 struct filed *f; 3159 3160 SIMPLEQ_FOREACH(f, &Files, f_next) { 3161 if (f->f_type == F_MEMBUF && 3162 strcmp(f->f_un.f_mb.f_mname, name) == 0) 3163 break; 3164 } 3165 return (f); 3166 } 3167 3168 void 3169 ctlconn_readcb(int fd, short event, void *arg) 3170 { 3171 struct filed *f; 3172 struct ctl_reply_hdr *reply_hdr = (struct ctl_reply_hdr *)ctl_reply; 3173 ssize_t n; 3174 u_int32_t flags = 0; 3175 3176 if (ctl_state == CTL_WRITING_REPLY || 3177 ctl_state == CTL_WRITING_CONT_REPLY) { 3178 /* client has closed the connection */ 3179 ctlconn_cleanup(); 3180 return; 3181 } 3182 3183 retry: 3184 n = read(fd, (char*)&ctl_cmd + ctl_cmd_bytes, 3185 sizeof(ctl_cmd) - ctl_cmd_bytes); 3186 switch (n) { 3187 case -1: 3188 if (errno == EINTR) 3189 goto retry; 3190 if (errno == EWOULDBLOCK) 3191 return; 3192 log_warn("read control socket"); 3193 /* FALLTHROUGH */ 3194 case 0: 3195 ctlconn_cleanup(); 3196 return; 3197 default: 3198 ctl_cmd_bytes += n; 3199 } 3200 if (ctl_cmd_bytes < sizeof(ctl_cmd)) 3201 return; 3202 3203 if (ntohl(ctl_cmd.version) != CTL_VERSION) { 3204 log_warnx("unknown client protocol version"); 3205 ctlconn_cleanup(); 3206 return; 3207 } 3208 3209 /* Ensure that logname is \0 terminated */ 3210 if (memchr(ctl_cmd.logname, '\0', sizeof(ctl_cmd.logname)) == NULL) { 3211 log_warnx("corrupt control socket command"); 3212 ctlconn_cleanup(); 3213 return; 3214 } 3215 3216 *reply_text = '\0'; 3217 3218 ctl_reply_size = ctl_reply_offset = 0; 3219 memset(reply_hdr, '\0', sizeof(*reply_hdr)); 3220 3221 ctl_cmd.cmd = ntohl(ctl_cmd.cmd); 3222 log_debug("ctlcmd %x logname \"%s\"", ctl_cmd.cmd, ctl_cmd.logname); 3223 3224 switch (ctl_cmd.cmd) { 3225 case CMD_READ: 3226 case CMD_READ_CLEAR: 3227 case CMD_READ_CONT: 3228 case CMD_FLAGS: 3229 f = find_membuf_log(ctl_cmd.logname); 3230 if (f == NULL) { 3231 strlcpy(reply_text, "No such log\n", MAX_MEMBUF); 3232 } else { 3233 if (ctl_cmd.cmd != CMD_FLAGS) { 3234 ringbuf_to_string(reply_text, MAX_MEMBUF, 3235 f->f_un.f_mb.f_rb); 3236 } 3237 if (f->f_un.f_mb.f_overflow) 3238 flags |= CTL_HDR_FLAG_OVERFLOW; 3239 if (ctl_cmd.cmd == CMD_READ_CLEAR) { 3240 ringbuf_clear(f->f_un.f_mb.f_rb); 3241 f->f_un.f_mb.f_overflow = 0; 3242 } 3243 if (ctl_cmd.cmd == CMD_READ_CONT) { 3244 f->f_un.f_mb.f_attached = 1; 3245 tailify_replytext(reply_text, 3246 ctl_cmd.lines > 0 ? ctl_cmd.lines : 10); 3247 } else if (ctl_cmd.lines > 0) { 3248 tailify_replytext(reply_text, ctl_cmd.lines); 3249 } 3250 } 3251 break; 3252 case CMD_CLEAR: 3253 f = find_membuf_log(ctl_cmd.logname); 3254 if (f == NULL) { 3255 strlcpy(reply_text, "No such log\n", MAX_MEMBUF); 3256 } else { 3257 ringbuf_clear(f->f_un.f_mb.f_rb); 3258 if (f->f_un.f_mb.f_overflow) 3259 flags |= CTL_HDR_FLAG_OVERFLOW; 3260 f->f_un.f_mb.f_overflow = 0; 3261 strlcpy(reply_text, "Log cleared\n", MAX_MEMBUF); 3262 } 3263 break; 3264 case CMD_LIST: 3265 SIMPLEQ_FOREACH(f, &Files, f_next) { 3266 if (f->f_type == F_MEMBUF) { 3267 strlcat(reply_text, f->f_un.f_mb.f_mname, 3268 MAX_MEMBUF); 3269 if (f->f_un.f_mb.f_overflow) { 3270 strlcat(reply_text, "*", MAX_MEMBUF); 3271 flags |= CTL_HDR_FLAG_OVERFLOW; 3272 } 3273 strlcat(reply_text, " ", MAX_MEMBUF); 3274 } 3275 } 3276 strlcat(reply_text, "\n", MAX_MEMBUF); 3277 break; 3278 default: 3279 log_warnx("unsupported control socket command"); 3280 ctlconn_cleanup(); 3281 return; 3282 } 3283 reply_hdr->version = htonl(CTL_VERSION); 3284 reply_hdr->flags = htonl(flags); 3285 3286 ctl_reply_size = CTL_REPLY_SIZE; 3287 log_debug("ctlcmd reply length %lu", (u_long)ctl_reply_size); 3288 3289 /* Otherwise, set up to write out reply */ 3290 ctl_state = (ctl_cmd.cmd == CMD_READ_CONT) ? 3291 CTL_WRITING_CONT_REPLY : CTL_WRITING_REPLY; 3292 3293 event_add(ev_ctlwrite, NULL); 3294 3295 /* another syslogc can kick us out */ 3296 if (ctl_state == CTL_WRITING_CONT_REPLY) 3297 event_add(ev_ctlaccept, NULL); 3298 } 3299 3300 void 3301 ctlconn_writecb(int fd, short event, void *arg) 3302 { 3303 struct event *ev = arg; 3304 ssize_t n; 3305 3306 if (!(ctl_state == CTL_WRITING_REPLY || 3307 ctl_state == CTL_WRITING_CONT_REPLY)) { 3308 /* Shouldn't be here! */ 3309 log_warnx("control socket write with bad state"); 3310 ctlconn_cleanup(); 3311 return; 3312 } 3313 3314 retry: 3315 n = write(fd, ctl_reply + ctl_reply_offset, 3316 ctl_reply_size - ctl_reply_offset); 3317 switch (n) { 3318 case -1: 3319 if (errno == EINTR) 3320 goto retry; 3321 if (errno == EWOULDBLOCK) 3322 return; 3323 if (errno != EPIPE) 3324 log_warn("write control socket"); 3325 /* FALLTHROUGH */ 3326 case 0: 3327 ctlconn_cleanup(); 3328 return; 3329 default: 3330 ctl_reply_offset += n; 3331 } 3332 if (ctl_reply_offset < ctl_reply_size) 3333 return; 3334 3335 if (ctl_state != CTL_WRITING_CONT_REPLY) { 3336 ctlconn_cleanup(); 3337 return; 3338 } 3339 3340 /* 3341 * Make space in the buffer for continous writes. 3342 * Set offset behind reply header to skip it 3343 */ 3344 *reply_text = '\0'; 3345 ctl_reply_offset = ctl_reply_size = CTL_REPLY_SIZE; 3346 3347 /* Now is a good time to report dropped lines */ 3348 if (membuf_drop) { 3349 strlcat(reply_text, "<ENOBUFS>\n", MAX_MEMBUF); 3350 ctl_reply_size = CTL_REPLY_SIZE; 3351 membuf_drop = 0; 3352 } else { 3353 /* Nothing left to write */ 3354 event_del(ev); 3355 } 3356 } 3357 3358 /* Shorten replytext to number of lines */ 3359 void 3360 tailify_replytext(char *replytext, int lines) 3361 { 3362 char *start, *nl; 3363 int count = 0; 3364 start = nl = replytext; 3365 3366 while ((nl = strchr(nl, '\n')) != NULL) { 3367 nl++; 3368 if (++count > lines) { 3369 start = strchr(start, '\n'); 3370 start++; 3371 } 3372 } 3373 if (start != replytext) { 3374 int len = strlen(start); 3375 memmove(replytext, start, len); 3376 *(replytext + len) = '\0'; 3377 } 3378 } 3379 3380 void 3381 ctlconn_logto(char *line) 3382 { 3383 size_t l; 3384 3385 if (membuf_drop) 3386 return; 3387 3388 l = strlen(line); 3389 if (l + 2 > (CTL_REPLY_MAXSIZE - ctl_reply_size)) { 3390 /* remember line drops for later report */ 3391 membuf_drop = 1; 3392 return; 3393 } 3394 memcpy(ctl_reply + ctl_reply_size, line, l); 3395 memcpy(ctl_reply + ctl_reply_size + l, "\n", 2); 3396 ctl_reply_size += l + 1; 3397 event_add(ev_ctlwrite, NULL); 3398 } 3399