1 /* $OpenBSD: syslogd.c,v 1.264 2020/09/14 20:36:01 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 set_keepalive(int); 358 void tailify_replytext(char *, int); 359 360 int 361 main(int argc, char *argv[]) 362 { 363 struct timeval to; 364 struct event *ev_klog, *ev_sendsys, *ev_udp, *ev_udp6, 365 *ev_bind, *ev_listen, *ev_tls, *ev_unix, 366 *ev_hup, *ev_int, *ev_quit, *ev_term, *ev_mark; 367 sigset_t sigmask; 368 const char *errstr; 369 char *p; 370 int ch, i; 371 int lockpipe[2] = { -1, -1}, pair[2], nullfd, fd; 372 int fd_ctlsock, fd_klog, fd_sendsys, *fd_bind, *fd_listen; 373 int *fd_tls, *fd_unix, nunix, nbind, nlisten, ntls; 374 char **path_unix, *path_ctlsock; 375 char **bind_host, **bind_port, **listen_host, **listen_port; 376 char *tls_hostport, **tls_host, **tls_port; 377 378 /* block signal until handler is set up */ 379 sigemptyset(&sigmask); 380 sigaddset(&sigmask, SIGHUP); 381 if (sigprocmask(SIG_SETMASK, &sigmask, NULL) == -1) 382 err(1, "sigprocmask block"); 383 384 if ((path_unix = malloc(sizeof(*path_unix))) == NULL) 385 err(1, "malloc %s", _PATH_LOG); 386 path_unix[0] = _PATH_LOG; 387 nunix = 1; 388 path_ctlsock = NULL; 389 390 bind_host = listen_host = tls_host = NULL; 391 bind_port = listen_port = tls_port = NULL; 392 tls_hostport = NULL; 393 nbind = nlisten = ntls = 0; 394 395 while ((ch = getopt(argc, argv, 396 "46a:C:c:dFf:hK:k:m:nP:p:rS:s:T:U:uVZ")) != -1) { 397 switch (ch) { 398 case '4': /* disable IPv6 */ 399 Family = PF_INET; 400 break; 401 case '6': /* disable IPv4 */ 402 Family = PF_INET6; 403 break; 404 case 'a': 405 if ((path_unix = reallocarray(path_unix, nunix + 1, 406 sizeof(*path_unix))) == NULL) 407 err(1, "unix path %s", optarg); 408 path_unix[nunix++] = optarg; 409 break; 410 case 'C': /* file containing CA certificates */ 411 CAfile = optarg; 412 break; 413 case 'c': /* file containing client certificate */ 414 ClientCertfile = optarg; 415 break; 416 case 'd': /* debug */ 417 Debug++; 418 break; 419 case 'F': /* foreground */ 420 Foreground = 1; 421 break; 422 case 'f': /* configuration file */ 423 ConfFile = optarg; 424 break; 425 case 'h': /* RFC 3164 hostnames */ 426 IncludeHostname = 1; 427 break; 428 case 'K': /* verify client with CA file */ 429 ServerCAfile = optarg; 430 break; 431 case 'k': /* file containing client key */ 432 ClientKeyfile = optarg; 433 break; 434 case 'm': /* mark interval */ 435 MarkInterval = strtonum(optarg, 0, 365*24*60, &errstr); 436 if (errstr) 437 errx(1, "mark_interval %s: %s", errstr, optarg); 438 MarkInterval *= 60; 439 break; 440 case 'n': /* don't do DNS lookups */ 441 NoDNS = 1; 442 break; 443 case 'P': /* used internally, exec the parent */ 444 PrivChild = strtonum(optarg, 2, INT_MAX, &errstr); 445 if (errstr) 446 errx(1, "priv child %s: %s", errstr, optarg); 447 break; 448 case 'p': /* path */ 449 path_unix[0] = optarg; 450 break; 451 case 'r': 452 Repeat++; 453 break; 454 case 'S': /* allow tls and listen on address */ 455 if (tls_hostport == NULL) 456 tls_hostport = optarg; 457 address_alloc("tls", optarg, &tls_host, &tls_port, 458 &ntls); 459 break; 460 case 's': 461 path_ctlsock = optarg; 462 break; 463 case 'T': /* allow tcp and listen on address */ 464 address_alloc("listen", optarg, &listen_host, 465 &listen_port, &nlisten); 466 break; 467 case 'U': /* allow udp only from address */ 468 address_alloc("bind", optarg, &bind_host, &bind_port, 469 &nbind); 470 break; 471 case 'u': /* allow udp input port */ 472 SecureMode = 0; 473 break; 474 case 'V': /* do not verify certificates */ 475 NoVerify = 1; 476 break; 477 case 'Z': /* time stamps in UTC ISO format */ 478 ZuluTime = 1; 479 break; 480 default: 481 usage(); 482 } 483 } 484 if (argc != optind) 485 usage(); 486 487 log_init(Debug, LOG_SYSLOG); 488 log_procinit("syslogd"); 489 if (Debug) 490 setvbuf(stdout, NULL, _IOLBF, 0); 491 492 if ((nullfd = open(_PATH_DEVNULL, O_RDWR)) == -1) 493 fatal("open %s", _PATH_DEVNULL); 494 for (fd = nullfd + 1; fd <= STDERR_FILENO; fd++) { 495 if (fcntl(fd, F_GETFL) == -1 && errno == EBADF) 496 if (dup2(nullfd, fd) == -1) 497 fatal("dup2 null"); 498 } 499 500 if (PrivChild > 1) 501 priv_exec(ConfFile, NoDNS, PrivChild, argc, argv); 502 503 consfile.f_type = F_CONSOLE; 504 (void)strlcpy(consfile.f_un.f_fname, ctty, 505 sizeof(consfile.f_un.f_fname)); 506 consfile.f_file = open(consfile.f_un.f_fname, O_WRONLY|O_NONBLOCK, 0); 507 if (consfile.f_file == -1) 508 log_warn("open %s", consfile.f_un.f_fname); 509 510 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 511 if ((p = strchr(LocalHostName, '.')) != NULL) { 512 *p++ = '\0'; 513 LocalDomain = p; 514 } else 515 LocalDomain = ""; 516 517 /* Reserve space for kernel message buffer plus buffer full message. */ 518 linesize = getmsgbufsize() + 64; 519 if (linesize < LOG_MAXLINE) 520 linesize = LOG_MAXLINE; 521 linesize++; 522 if ((linebuf = malloc(linesize)) == NULL) 523 fatal("allocate line buffer"); 524 525 if (socket_bind("udp", NULL, "syslog", SecureMode, 526 &fd_udp, &fd_udp6) == -1) 527 log_warnx("socket bind * failed"); 528 if ((fd_bind = reallocarray(NULL, nbind, sizeof(*fd_bind))) == NULL) 529 fatal("allocate bind fd"); 530 for (i = 0; i < nbind; i++) { 531 if (socket_bind("udp", bind_host[i], bind_port[i], 0, 532 &fd_bind[i], &fd_bind[i]) == -1) 533 log_warnx("socket bind udp failed"); 534 } 535 if ((fd_listen = reallocarray(NULL, nlisten, sizeof(*fd_listen))) 536 == NULL) 537 fatal("allocate listen fd"); 538 for (i = 0; i < nlisten; i++) { 539 if (socket_bind("tcp", listen_host[i], listen_port[i], 0, 540 &fd_listen[i], &fd_listen[i]) == -1) 541 log_warnx("socket listen tcp failed"); 542 } 543 if ((fd_tls = reallocarray(NULL, ntls, sizeof(*fd_tls))) == NULL) 544 fatal("allocate tls fd"); 545 for (i = 0; i < ntls; i++) { 546 if (socket_bind("tls", tls_host[i], tls_port[i], 0, 547 &fd_tls[i], &fd_tls[i]) == -1) 548 log_warnx("socket listen tls failed"); 549 } 550 551 if ((fd_unix = reallocarray(NULL, nunix, sizeof(*fd_unix))) == NULL) 552 fatal("allocate unix fd"); 553 for (i = 0; i < nunix; i++) { 554 fd_unix[i] = unix_socket(path_unix[i], SOCK_DGRAM, 0666); 555 if (fd_unix[i] == -1) { 556 if (i == 0) 557 log_warnx("log socket %s failed", path_unix[i]); 558 continue; 559 } 560 double_sockbuf(fd_unix[i], SO_RCVBUF, 0); 561 } 562 563 if (socketpair(AF_UNIX, SOCK_DGRAM, PF_UNSPEC, pair) == -1) { 564 log_warn("socketpair sendsyslog"); 565 fd_sendsys = -1; 566 } else { 567 /* 568 * Avoid to lose messages from sendsyslog(2). A larger 569 * 1 MB socket buffer compensates bursts. 570 */ 571 double_sockbuf(pair[0], SO_RCVBUF, 1<<20); 572 double_sockbuf(pair[1], SO_SNDBUF, 1<<20); 573 fd_sendsys = pair[0]; 574 } 575 576 fd_ctlsock = fd_ctlconn = -1; 577 if (path_ctlsock != NULL) { 578 fd_ctlsock = unix_socket(path_ctlsock, SOCK_STREAM, 0600); 579 if (fd_ctlsock == -1) { 580 log_warnx("control socket %s failed", path_ctlsock); 581 } else { 582 if (listen(fd_ctlsock, 5) == -1) { 583 log_warn("listen control socket"); 584 close(fd_ctlsock); 585 fd_ctlsock = -1; 586 } 587 } 588 } 589 590 if ((fd_klog = open(_PATH_KLOG, O_RDONLY, 0)) == -1) { 591 log_warn("open %s", _PATH_KLOG); 592 } else if (fd_sendsys != -1) { 593 /* Use /dev/klog to register sendsyslog(2) receiver. */ 594 if (ioctl(fd_klog, LIOCSFD, &pair[1]) == -1) 595 log_warn("ioctl klog LIOCSFD sendsyslog"); 596 } 597 if (fd_sendsys != -1) 598 close(pair[1]); 599 600 if (tls_init() == -1) { 601 log_warn("tls_init"); 602 } else { 603 if ((client_config = tls_config_new()) == NULL) 604 log_warn("tls_config_new client"); 605 if (tls_hostport) { 606 if ((server_config = tls_config_new()) == NULL) 607 log_warn("tls_config_new server"); 608 if ((server_ctx = tls_server()) == NULL) { 609 log_warn("tls_server"); 610 for (i = 0; i < ntls; i++) 611 close(fd_tls[i]); 612 free(fd_tls); 613 fd_tls = NULL; 614 free(tls_host); 615 free(tls_port); 616 tls_host = tls_port = NULL; 617 ntls = 0; 618 } 619 } 620 } 621 if (client_config) { 622 if (NoVerify) { 623 tls_config_insecure_noverifycert(client_config); 624 tls_config_insecure_noverifyname(client_config); 625 } else { 626 if (tls_config_set_ca_file(client_config, 627 CAfile) == -1) { 628 log_warnx("load client TLS CA: %s", 629 tls_config_error(client_config)); 630 /* avoid reading default certs in chroot */ 631 tls_config_set_ca_mem(client_config, "", 0); 632 } else 633 log_debug("CAfile %s", CAfile); 634 } 635 if (ClientCertfile && ClientKeyfile) { 636 if (tls_config_set_cert_file(client_config, 637 ClientCertfile) == -1) 638 log_warnx("load client TLS cert: %s", 639 tls_config_error(client_config)); 640 else 641 log_debug("ClientCertfile %s", ClientCertfile); 642 643 if (tls_config_set_key_file(client_config, 644 ClientKeyfile) == -1) 645 log_warnx("load client TLS key: %s", 646 tls_config_error(client_config)); 647 else 648 log_debug("ClientKeyfile %s", ClientKeyfile); 649 } else if (ClientCertfile || ClientKeyfile) { 650 log_warnx("options -c and -k must be used together"); 651 } 652 if (tls_config_set_protocols(client_config, 653 TLS_PROTOCOLS_ALL) != 0) 654 log_warnx("set client TLS protocols: %s", 655 tls_config_error(client_config)); 656 if (tls_config_set_ciphers(client_config, "all") != 0) 657 log_warnx("set client TLS ciphers: %s", 658 tls_config_error(client_config)); 659 } 660 if (server_config && server_ctx) { 661 const char *names[2]; 662 663 names[0] = tls_hostport; 664 names[1] = tls_host[0]; 665 666 for (i = 0; i < 2; i++) { 667 if (asprintf(&p, "/etc/ssl/private/%s.key", names[i]) 668 == -1) 669 continue; 670 if (tls_config_set_key_file(server_config, p) == -1) { 671 log_warnx("load server TLS key: %s", 672 tls_config_error(server_config)); 673 free(p); 674 continue; 675 } 676 log_debug("Keyfile %s", p); 677 free(p); 678 if (asprintf(&p, "/etc/ssl/%s.crt", names[i]) == -1) 679 continue; 680 if (tls_config_set_cert_file(server_config, p) == -1) { 681 log_warnx("load server TLS cert: %s", 682 tls_config_error(server_config)); 683 free(p); 684 continue; 685 } 686 log_debug("Certfile %s", p); 687 free(p); 688 break; 689 } 690 691 if (ServerCAfile) { 692 if (tls_config_set_ca_file(server_config, 693 ServerCAfile) == -1) { 694 log_warnx("load server TLS CA: %s", 695 tls_config_error(server_config)); 696 /* avoid reading default certs in chroot */ 697 tls_config_set_ca_mem(server_config, "", 0); 698 } else 699 log_debug("Server CAfile %s", ServerCAfile); 700 tls_config_verify_client(server_config); 701 } 702 if (tls_config_set_protocols(server_config, 703 TLS_PROTOCOLS_ALL) != 0) 704 log_warnx("set server TLS protocols: %s", 705 tls_config_error(server_config)); 706 if (tls_config_set_ciphers(server_config, "compat") != 0) 707 log_warnx("Set server TLS ciphers: %s", 708 tls_config_error(server_config)); 709 if (tls_configure(server_ctx, server_config) != 0) { 710 log_warnx("tls_configure server: %s", 711 tls_error(server_ctx)); 712 tls_free(server_ctx); 713 server_ctx = NULL; 714 for (i = 0; i < ntls; i++) 715 close(fd_tls[i]); 716 free(fd_tls); 717 fd_tls = NULL; 718 free(tls_host); 719 free(tls_port); 720 tls_host = tls_port = NULL; 721 ntls = 0; 722 } 723 } 724 725 log_debug("off & running...."); 726 727 if (!Debug && !Foreground) { 728 char c; 729 730 pipe(lockpipe); 731 732 switch(fork()) { 733 case -1: 734 err(1, "fork"); 735 case 0: 736 setsid(); 737 close(lockpipe[0]); 738 break; 739 default: 740 close(lockpipe[1]); 741 read(lockpipe[0], &c, 1); 742 _exit(0); 743 } 744 } 745 746 /* tuck my process id away */ 747 if (!Debug) { 748 FILE *fp; 749 750 fp = fopen(_PATH_LOGPID, "w"); 751 if (fp != NULL) { 752 fprintf(fp, "%ld\n", (long)getpid()); 753 (void) fclose(fp); 754 } 755 } 756 757 /* Privilege separation begins here */ 758 priv_init(lockpipe[1], nullfd, argc, argv); 759 760 if (pledge("stdio unix inet recvfd", NULL) == -1) 761 err(1, "pledge"); 762 763 Started = 1; 764 765 /* Process is now unprivileged and inside a chroot */ 766 if (Debug) 767 event_set_log_callback(logevent); 768 event_init(); 769 770 if ((ev_ctlaccept = malloc(sizeof(struct event))) == NULL || 771 (ev_ctlread = malloc(sizeof(struct event))) == NULL || 772 (ev_ctlwrite = malloc(sizeof(struct event))) == NULL || 773 (ev_klog = malloc(sizeof(struct event))) == NULL || 774 (ev_sendsys = malloc(sizeof(struct event))) == NULL || 775 (ev_udp = malloc(sizeof(struct event))) == NULL || 776 (ev_udp6 = malloc(sizeof(struct event))) == NULL || 777 (ev_bind = reallocarray(NULL, nbind, sizeof(struct event))) 778 == NULL || 779 (ev_listen = reallocarray(NULL, nlisten, sizeof(struct event))) 780 == NULL || 781 (ev_tls = reallocarray(NULL, ntls, sizeof(struct event))) 782 == NULL || 783 (ev_unix = reallocarray(NULL, nunix, sizeof(struct event))) 784 == NULL || 785 (ev_hup = malloc(sizeof(struct event))) == NULL || 786 (ev_int = malloc(sizeof(struct event))) == NULL || 787 (ev_quit = malloc(sizeof(struct event))) == NULL || 788 (ev_term = malloc(sizeof(struct event))) == NULL || 789 (ev_mark = malloc(sizeof(struct event))) == NULL) 790 err(1, "malloc"); 791 792 event_set(ev_ctlaccept, fd_ctlsock, EV_READ|EV_PERSIST, 793 ctlsock_acceptcb, ev_ctlaccept); 794 event_set(ev_ctlread, fd_ctlconn, EV_READ|EV_PERSIST, 795 ctlconn_readcb, ev_ctlread); 796 event_set(ev_ctlwrite, fd_ctlconn, EV_WRITE|EV_PERSIST, 797 ctlconn_writecb, ev_ctlwrite); 798 event_set(ev_klog, fd_klog, EV_READ|EV_PERSIST, klog_readcb, ev_klog); 799 event_set(ev_sendsys, fd_sendsys, EV_READ|EV_PERSIST, unix_readcb, 800 ev_sendsys); 801 event_set(ev_udp, fd_udp, EV_READ|EV_PERSIST, udp_readcb, ev_udp); 802 event_set(ev_udp6, fd_udp6, EV_READ|EV_PERSIST, udp_readcb, ev_udp6); 803 for (i = 0; i < nbind; i++) 804 event_set(&ev_bind[i], fd_bind[i], EV_READ|EV_PERSIST, 805 udp_readcb, &ev_bind[i]); 806 for (i = 0; i < nlisten; i++) 807 event_set(&ev_listen[i], fd_listen[i], EV_READ|EV_PERSIST, 808 tcp_acceptcb, &ev_listen[i]); 809 for (i = 0; i < ntls; i++) 810 event_set(&ev_tls[i], fd_tls[i], EV_READ|EV_PERSIST, 811 tls_acceptcb, &ev_tls[i]); 812 for (i = 0; i < nunix; i++) 813 event_set(&ev_unix[i], fd_unix[i], EV_READ|EV_PERSIST, 814 unix_readcb, &ev_unix[i]); 815 816 signal_set(ev_hup, SIGHUP, init_signalcb, ev_hup); 817 signal_set(ev_int, SIGINT, die_signalcb, ev_int); 818 signal_set(ev_quit, SIGQUIT, die_signalcb, ev_quit); 819 signal_set(ev_term, SIGTERM, die_signalcb, ev_term); 820 821 evtimer_set(ev_mark, mark_timercb, ev_mark); 822 823 init(); 824 825 /* Allocate ctl socket reply buffer if we have a ctl socket */ 826 if (fd_ctlsock != -1 && 827 (ctl_reply = malloc(CTL_REPLY_MAXSIZE)) == NULL) 828 fatal("allocate control socket reply buffer"); 829 reply_text = ctl_reply + CTL_HDR_LEN; 830 831 if (!Debug) { 832 close(lockpipe[1]); 833 dup2(nullfd, STDIN_FILENO); 834 dup2(nullfd, STDOUT_FILENO); 835 dup2(nullfd, STDERR_FILENO); 836 } 837 if (nullfd > 2) 838 close(nullfd); 839 840 /* 841 * Signal to the priv process that the initial config parsing is done 842 * so that it will reject any future attempts to open more files 843 */ 844 priv_config_parse_done(); 845 846 if (fd_ctlsock != -1) 847 event_add(ev_ctlaccept, NULL); 848 if (fd_klog != -1) 849 event_add(ev_klog, NULL); 850 if (fd_sendsys != -1) 851 event_add(ev_sendsys, NULL); 852 if (!SecureMode) { 853 if (fd_udp != -1) 854 event_add(ev_udp, NULL); 855 if (fd_udp6 != -1) 856 event_add(ev_udp6, NULL); 857 } 858 for (i = 0; i < nbind; i++) 859 if (fd_bind[i] != -1) 860 event_add(&ev_bind[i], NULL); 861 for (i = 0; i < nlisten; i++) 862 if (fd_listen[i] != -1) 863 event_add(&ev_listen[i], NULL); 864 for (i = 0; i < ntls; i++) 865 if (fd_tls[i] != -1) 866 event_add(&ev_tls[i], NULL); 867 for (i = 0; i < nunix; i++) 868 if (fd_unix[i] != -1) 869 event_add(&ev_unix[i], NULL); 870 871 signal_add(ev_hup, NULL); 872 signal_add(ev_term, NULL); 873 if (Debug || Foreground) { 874 signal_add(ev_int, NULL); 875 signal_add(ev_quit, NULL); 876 } else { 877 (void)signal(SIGINT, SIG_IGN); 878 (void)signal(SIGQUIT, SIG_IGN); 879 } 880 (void)signal(SIGCHLD, SIG_IGN); 881 (void)signal(SIGPIPE, SIG_IGN); 882 883 to.tv_sec = TIMERINTVL; 884 to.tv_usec = 0; 885 evtimer_add(ev_mark, &to); 886 887 log_info(LOG_INFO, "start"); 888 log_debug("syslogd: started"); 889 890 sigemptyset(&sigmask); 891 if (sigprocmask(SIG_SETMASK, &sigmask, NULL) == -1) 892 err(1, "sigprocmask unblock"); 893 894 event_dispatch(); 895 /* NOTREACHED */ 896 return (0); 897 } 898 899 void 900 address_alloc(const char *name, const char *address, char ***host, 901 char ***port, int *num) 902 { 903 char *p; 904 905 /* do not care about memory leak, argv has to be preserved */ 906 if ((p = strdup(address)) == NULL) 907 err(1, "%s address %s", name, address); 908 if ((*host = reallocarray(*host, *num + 1, sizeof(**host))) == NULL) 909 err(1, "%s host %s", name, address); 910 if ((*port = reallocarray(*port, *num + 1, sizeof(**port))) == NULL) 911 err(1, "%s port %s", name, address); 912 if (loghost_parse(p, NULL, *host + *num, *port + *num) == -1) 913 errx(1, "bad %s address: %s", name, address); 914 (*num)++; 915 } 916 917 int 918 socket_bind(const char *proto, const char *host, const char *port, 919 int shutread, int *fd, int *fd6) 920 { 921 struct addrinfo hints, *res, *res0; 922 char hostname[NI_MAXHOST], servname[NI_MAXSERV]; 923 int *fdp, error, reuseaddr; 924 925 *fd = *fd6 = -1; 926 if (proto == NULL) 927 proto = "udp"; 928 if (port == NULL) 929 port = strcmp(proto, "tls") == 0 ? "syslog-tls" : "syslog"; 930 931 memset(&hints, 0, sizeof(hints)); 932 hints.ai_family = Family; 933 if (strcmp(proto, "udp") == 0) { 934 hints.ai_socktype = SOCK_DGRAM; 935 hints.ai_protocol = IPPROTO_UDP; 936 } else { 937 hints.ai_socktype = SOCK_STREAM; 938 hints.ai_protocol = IPPROTO_TCP; 939 } 940 hints.ai_flags = AI_PASSIVE; 941 942 if ((error = getaddrinfo(host, port, &hints, &res0))) { 943 log_warnx("getaddrinfo proto %s, host %s, port %s: %s", 944 proto, host ? host : "*", port, gai_strerror(error)); 945 return (-1); 946 } 947 948 for (res = res0; res; res = res->ai_next) { 949 switch (res->ai_family) { 950 case AF_INET: 951 fdp = fd; 952 break; 953 case AF_INET6: 954 fdp = fd6; 955 break; 956 default: 957 continue; 958 } 959 if (*fdp >= 0) 960 continue; 961 962 if ((*fdp = socket(res->ai_family, 963 res->ai_socktype | SOCK_NONBLOCK, res->ai_protocol)) == -1) 964 continue; 965 966 if (getnameinfo(res->ai_addr, res->ai_addrlen, hostname, 967 sizeof(hostname), servname, sizeof(servname), 968 NI_NUMERICHOST | NI_NUMERICSERV | 969 (res->ai_socktype == SOCK_DGRAM ? NI_DGRAM : 0)) != 0) { 970 log_debug("Malformed bind address"); 971 hostname[0] = servname[0] = '\0'; 972 } 973 if (shutread && shutdown(*fdp, SHUT_RD) == -1) { 974 log_warn("shutdown SHUT_RD " 975 "protocol %d, address %s, portnum %s", 976 res->ai_protocol, hostname, servname); 977 close(*fdp); 978 *fdp = -1; 979 continue; 980 } 981 if (!shutread && res->ai_protocol == IPPROTO_UDP) 982 double_sockbuf(*fdp, SO_RCVBUF, 0); 983 else if (res->ai_protocol == IPPROTO_TCP) { 984 set_sockbuf(*fdp); 985 set_keepalive(*fdp); 986 } 987 reuseaddr = 1; 988 if (setsockopt(*fdp, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, 989 sizeof(reuseaddr)) == -1) { 990 log_warn("setsockopt SO_REUSEADDR " 991 "protocol %d, address %s, portnum %s", 992 res->ai_protocol, hostname, servname); 993 close(*fdp); 994 *fdp = -1; 995 continue; 996 } 997 if (bind(*fdp, res->ai_addr, res->ai_addrlen) == -1) { 998 log_warn("bind protocol %d, address %s, portnum %s", 999 res->ai_protocol, hostname, servname); 1000 close(*fdp); 1001 *fdp = -1; 1002 continue; 1003 } 1004 if (!shutread && res->ai_protocol == IPPROTO_TCP && 1005 listen(*fdp, 10) == -1) { 1006 log_warn("listen protocol %d, address %s, portnum %s", 1007 res->ai_protocol, hostname, servname); 1008 close(*fdp); 1009 *fdp = -1; 1010 continue; 1011 } 1012 } 1013 1014 freeaddrinfo(res0); 1015 1016 if (*fd == -1 && *fd6 == -1) 1017 return (-1); 1018 return (0); 1019 } 1020 1021 void 1022 klog_readcb(int fd, short event, void *arg) 1023 { 1024 struct event *ev = arg; 1025 ssize_t n; 1026 1027 n = read(fd, linebuf, linesize - 1); 1028 if (n > 0) { 1029 linebuf[n] = '\0'; 1030 printsys(linebuf); 1031 } else if (n == -1 && errno != EINTR) { 1032 log_warn("read klog"); 1033 event_del(ev); 1034 } 1035 } 1036 1037 void 1038 udp_readcb(int fd, short event, void *arg) 1039 { 1040 struct sockaddr_storage sa; 1041 socklen_t salen; 1042 ssize_t n; 1043 1044 salen = sizeof(sa); 1045 n = recvfrom(fd, linebuf, LOG_MAXLINE, 0, (struct sockaddr *)&sa, 1046 &salen); 1047 if (n > 0) { 1048 char resolve[NI_MAXHOST]; 1049 1050 linebuf[n] = '\0'; 1051 cvthname((struct sockaddr *)&sa, resolve, sizeof(resolve)); 1052 log_debug("cvthname res: %s", resolve); 1053 printline(resolve, linebuf); 1054 } else if (n == -1 && errno != EINTR && errno != EWOULDBLOCK) 1055 log_warn("recvfrom udp"); 1056 } 1057 1058 void 1059 unix_readcb(int fd, short event, void *arg) 1060 { 1061 struct sockaddr_un sa; 1062 socklen_t salen; 1063 ssize_t n; 1064 1065 salen = sizeof(sa); 1066 n = recvfrom(fd, linebuf, LOG_MAXLINE, 0, (struct sockaddr *)&sa, 1067 &salen); 1068 if (n > 0) { 1069 linebuf[n] = '\0'; 1070 printline(LocalHostName, linebuf); 1071 } else if (n == -1 && errno != EINTR && errno != EWOULDBLOCK) 1072 log_warn("recvfrom unix"); 1073 } 1074 1075 int 1076 reserve_accept4(int lfd, int event, struct event *ev, 1077 void (*cb)(int, short, void *), 1078 struct sockaddr *sa, socklen_t *salen, int flags) 1079 { 1080 struct timeval to = { 1, 0 }; 1081 int afd; 1082 1083 if (event & EV_TIMEOUT) { 1084 log_debug("Listen again"); 1085 /* Enable the listen event, there is no timeout anymore. */ 1086 event_set(ev, lfd, EV_READ|EV_PERSIST, cb, ev); 1087 event_add(ev, NULL); 1088 errno = EWOULDBLOCK; 1089 return (-1); 1090 } 1091 1092 if (getdtablecount() + FD_RESERVE >= getdtablesize()) { 1093 afd = -1; 1094 errno = EMFILE; 1095 } else 1096 afd = accept4(lfd, sa, salen, flags); 1097 1098 if (afd == -1 && (errno == ENFILE || errno == EMFILE)) { 1099 log_info(LOG_WARNING, "accept deferred: %s", strerror(errno)); 1100 /* 1101 * Disable the listen event and convert it to a timeout. 1102 * Pass the listen file descriptor to the callback. 1103 */ 1104 event_del(ev); 1105 event_set(ev, lfd, 0, cb, ev); 1106 event_add(ev, &to); 1107 return (-1); 1108 } 1109 1110 return (afd); 1111 } 1112 1113 void 1114 tcp_acceptcb(int lfd, short event, void *arg) 1115 { 1116 acceptcb(lfd, event, arg, 0); 1117 } 1118 1119 void 1120 tls_acceptcb(int lfd, short event, void *arg) 1121 { 1122 acceptcb(lfd, event, arg, 1); 1123 } 1124 1125 void 1126 acceptcb(int lfd, short event, void *arg, int usetls) 1127 { 1128 struct event *ev = arg; 1129 struct peer *p; 1130 struct sockaddr_storage ss; 1131 socklen_t sslen; 1132 char hostname[NI_MAXHOST], servname[NI_MAXSERV]; 1133 char *peername; 1134 int fd; 1135 1136 sslen = sizeof(ss); 1137 if ((fd = reserve_accept4(lfd, event, ev, tcp_acceptcb, 1138 (struct sockaddr *)&ss, &sslen, SOCK_NONBLOCK)) == -1) { 1139 if (errno != ENFILE && errno != EMFILE && 1140 errno != EINTR && errno != EWOULDBLOCK && 1141 errno != ECONNABORTED) 1142 log_warn("accept tcp socket"); 1143 return; 1144 } 1145 log_debug("Accepting tcp connection"); 1146 1147 if (getnameinfo((struct sockaddr *)&ss, sslen, hostname, 1148 sizeof(hostname), servname, sizeof(servname), 1149 NI_NUMERICHOST | NI_NUMERICSERV) != 0 || 1150 asprintf(&peername, ss.ss_family == AF_INET6 ? 1151 "[%s]:%s" : "%s:%s", hostname, servname) == -1) { 1152 log_debug("Malformed accept address"); 1153 peername = hostname_unknown; 1154 } 1155 log_debug("Peer addresss and port %s", peername); 1156 if ((p = malloc(sizeof(*p))) == NULL) { 1157 log_warn("allocate \"%s\"", peername); 1158 close(fd); 1159 return; 1160 } 1161 p->p_fd = fd; 1162 if ((p->p_bufev = bufferevent_new(fd, tcp_readcb, NULL, tcp_closecb, 1163 p)) == NULL) { 1164 log_warn("bufferevent \"%s\"", peername); 1165 free(p); 1166 close(fd); 1167 return; 1168 } 1169 p->p_ctx = NULL; 1170 if (usetls) { 1171 if (tls_accept_socket(server_ctx, &p->p_ctx, fd) == -1) { 1172 log_warnx("tls_accept_socket \"%s\": %s", 1173 peername, tls_error(server_ctx)); 1174 bufferevent_free(p->p_bufev); 1175 free(p); 1176 close(fd); 1177 return; 1178 } 1179 buffertls_set(&p->p_buftls, p->p_bufev, p->p_ctx, fd); 1180 buffertls_accept(&p->p_buftls, fd); 1181 log_debug("tcp accept callback: tls context success"); 1182 } 1183 if (!NoDNS && peername != hostname_unknown && 1184 priv_getnameinfo((struct sockaddr *)&ss, ss.ss_len, hostname, 1185 sizeof(hostname)) != 0) { 1186 log_debug("Host name for accept address (%s) unknown", 1187 hostname); 1188 } 1189 if (peername == hostname_unknown || 1190 (p->p_hostname = strdup(hostname)) == NULL) 1191 p->p_hostname = hostname_unknown; 1192 log_debug("Peer hostname %s", hostname); 1193 p->p_peername = peername; 1194 bufferevent_enable(p->p_bufev, EV_READ); 1195 1196 log_info(LOG_DEBUG, "%s logger \"%s\" accepted", 1197 p->p_ctx ? "tls" : "tcp", peername); 1198 } 1199 1200 /* 1201 * Syslog over TCP RFC 6587 3.4.1. Octet Counting 1202 */ 1203 int 1204 octet_counting(struct evbuffer *evbuf, char **msg, int drain) 1205 { 1206 char *p, *buf, *end; 1207 int len; 1208 1209 buf = EVBUFFER_DATA(evbuf); 1210 end = buf + EVBUFFER_LENGTH(evbuf); 1211 /* 1212 * It can be assumed that octet-counting framing is used if a syslog 1213 * frame starts with a digit. 1214 */ 1215 if (buf >= end || !isdigit((unsigned char)*buf)) 1216 return (-1); 1217 /* 1218 * SYSLOG-FRAME = MSG-LEN SP SYSLOG-MSG 1219 * MSG-LEN is the octet count of the SYSLOG-MSG in the SYSLOG-FRAME. 1220 * We support up to 5 digits in MSG-LEN, so the maximum is 99999. 1221 */ 1222 for (p = buf; p < end && p < buf + 5; p++) { 1223 if (!isdigit((unsigned char)*p)) 1224 break; 1225 } 1226 if (buf >= p || p >= end || *p != ' ') 1227 return (-1); 1228 p++; 1229 /* Using atoi() is safe as buf starts with 1 to 5 digits and a space. */ 1230 len = atoi(buf); 1231 if (drain) 1232 log_debugadd(" octet counting %d", len); 1233 if (p + len > end) 1234 return (0); 1235 if (drain) 1236 evbuffer_drain(evbuf, p - buf); 1237 if (msg) 1238 *msg = p; 1239 return (len); 1240 } 1241 1242 /* 1243 * Syslog over TCP RFC 6587 3.4.2. Non-Transparent-Framing 1244 */ 1245 int 1246 non_transparent_framing(struct evbuffer *evbuf, char **msg) 1247 { 1248 char *p, *buf, *end; 1249 1250 buf = EVBUFFER_DATA(evbuf); 1251 end = buf + EVBUFFER_LENGTH(evbuf); 1252 /* 1253 * The TRAILER has usually been a single character and most often 1254 * is ASCII LF (%d10). However, other characters have also been 1255 * seen, with ASCII NUL (%d00) being a prominent example. 1256 */ 1257 for (p = buf; p < end; p++) { 1258 if (*p == '\0' || *p == '\n') 1259 break; 1260 } 1261 if (p + 1 - buf >= INT_MAX) 1262 return (-1); 1263 log_debugadd(" non transparent framing"); 1264 if (p >= end) 1265 return (0); 1266 /* 1267 * Some devices have also been seen to emit a two-character 1268 * TRAILER, which is usually CR and LF. 1269 */ 1270 if (buf < p && p[0] == '\n' && p[-1] == '\r') 1271 p[-1] = '\0'; 1272 if (msg) 1273 *msg = buf; 1274 return (p + 1 - buf); 1275 } 1276 1277 void 1278 tcp_readcb(struct bufferevent *bufev, void *arg) 1279 { 1280 struct peer *p = arg; 1281 char *msg; 1282 int len; 1283 1284 while (EVBUFFER_LENGTH(bufev->input) > 0) { 1285 log_debugadd("%s logger \"%s\"", p->p_ctx ? "tls" : "tcp", 1286 p->p_peername); 1287 msg = NULL; 1288 len = octet_counting(bufev->input, &msg, 1); 1289 if (len < 0) 1290 len = non_transparent_framing(bufev->input, &msg); 1291 if (len < 0) 1292 log_debugadd("unknown method"); 1293 if (msg == NULL) { 1294 log_debugadd(", incomplete frame"); 1295 break; 1296 } 1297 log_debug(", use %d bytes", len); 1298 if (len > 0 && msg[len-1] == '\n') 1299 msg[len-1] = '\0'; 1300 if (len == 0 || msg[len-1] != '\0') { 1301 memcpy(linebuf, msg, MINIMUM(len, LOG_MAXLINE)); 1302 linebuf[MINIMUM(len, LOG_MAXLINE)] = '\0'; 1303 msg = linebuf; 1304 } 1305 printline(p->p_hostname, msg); 1306 evbuffer_drain(bufev->input, len); 1307 } 1308 /* Maximum frame has 5 digits, 1 space, MAXLINE chars, 1 new line. */ 1309 if (EVBUFFER_LENGTH(bufev->input) >= 5 + 1 + LOG_MAXLINE + 1) { 1310 log_debug(", use %zu bytes", EVBUFFER_LENGTH(bufev->input)); 1311 printline(p->p_hostname, EVBUFFER_DATA(bufev->input)); 1312 evbuffer_drain(bufev->input, -1); 1313 } else if (EVBUFFER_LENGTH(bufev->input) > 0) 1314 log_debug(", buffer %zu bytes", EVBUFFER_LENGTH(bufev->input)); 1315 } 1316 1317 void 1318 tcp_closecb(struct bufferevent *bufev, short event, void *arg) 1319 { 1320 struct peer *p = arg; 1321 1322 if (event & EVBUFFER_EOF) { 1323 log_info(LOG_DEBUG, "%s logger \"%s\" connection close", 1324 p->p_ctx ? "tls" : "tcp", p->p_peername); 1325 } else { 1326 log_info(LOG_NOTICE, "%s logger \"%s\" connection error: %s", 1327 p->p_ctx ? "tls" : "tcp", p->p_peername, 1328 p->p_ctx ? tls_error(p->p_ctx) : strerror(errno)); 1329 } 1330 1331 if (p->p_peername != hostname_unknown) 1332 free(p->p_peername); 1333 if (p->p_hostname != hostname_unknown) 1334 free(p->p_hostname); 1335 bufferevent_free(p->p_bufev); 1336 close(p->p_fd); 1337 free(p); 1338 } 1339 1340 int 1341 tcp_socket(struct filed *f) 1342 { 1343 int s; 1344 1345 if ((s = socket(f->f_un.f_forw.f_addr.ss_family, 1346 SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP)) == -1) { 1347 log_warn("socket \"%s\"", f->f_un.f_forw.f_loghost); 1348 return (-1); 1349 } 1350 set_sockbuf(s); 1351 if (connect(s, (struct sockaddr *)&f->f_un.f_forw.f_addr, 1352 f->f_un.f_forw.f_addr.ss_len) == -1 && errno != EINPROGRESS) { 1353 log_warn("connect \"%s\"", f->f_un.f_forw.f_loghost); 1354 close(s); 1355 return (-1); 1356 } 1357 return (s); 1358 } 1359 1360 void 1361 tcp_dropcb(struct bufferevent *bufev, void *arg) 1362 { 1363 struct filed *f = arg; 1364 1365 /* 1366 * Drop data received from the forward log server. 1367 */ 1368 log_debug("loghost \"%s\" did send %zu bytes back", 1369 f->f_un.f_forw.f_loghost, EVBUFFER_LENGTH(bufev->input)); 1370 evbuffer_drain(bufev->input, -1); 1371 } 1372 1373 void 1374 tcp_writecb(struct bufferevent *bufev, void *arg) 1375 { 1376 struct filed *f = arg; 1377 char ebuf[ERRBUFSIZE]; 1378 1379 /* 1380 * Successful write, connection to server is good, reset wait time. 1381 */ 1382 log_debug("loghost \"%s\" successful write", f->f_un.f_forw.f_loghost); 1383 f->f_un.f_forw.f_reconnectwait = 0; 1384 1385 if (f->f_dropped > 0 && 1386 EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->output) < MAX_TCPBUF) { 1387 snprintf(ebuf, sizeof(ebuf), "to loghost \"%s\"", 1388 f->f_un.f_forw.f_loghost); 1389 dropped_warn(&f->f_dropped, ebuf); 1390 } 1391 } 1392 1393 void 1394 tcp_errorcb(struct bufferevent *bufev, short event, void *arg) 1395 { 1396 struct filed *f = arg; 1397 char *p, *buf, *end; 1398 int l; 1399 char ebuf[ERRBUFSIZE]; 1400 1401 if (event & EVBUFFER_EOF) 1402 snprintf(ebuf, sizeof(ebuf), "loghost \"%s\" connection close", 1403 f->f_un.f_forw.f_loghost); 1404 else 1405 snprintf(ebuf, sizeof(ebuf), 1406 "loghost \"%s\" connection error: %s", 1407 f->f_un.f_forw.f_loghost, f->f_un.f_forw.f_ctx ? 1408 tls_error(f->f_un.f_forw.f_ctx) : strerror(errno)); 1409 log_debug("%s", ebuf); 1410 1411 /* The SIGHUP handler may also close the socket, so invalidate it. */ 1412 if (f->f_un.f_forw.f_ctx) { 1413 tls_close(f->f_un.f_forw.f_ctx); 1414 tls_free(f->f_un.f_forw.f_ctx); 1415 f->f_un.f_forw.f_ctx = NULL; 1416 } 1417 close(f->f_file); 1418 f->f_file = -1; 1419 1420 /* 1421 * The messages in the output buffer may be out of sync. 1422 * Check that the buffer starts with "1234 <1234 octets>\n". 1423 * Otherwise remove the partial message from the beginning. 1424 */ 1425 buf = EVBUFFER_DATA(bufev->output); 1426 end = buf + EVBUFFER_LENGTH(bufev->output); 1427 if (buf < end && !((l = octet_counting(bufev->output, &p, 0)) > 0 && 1428 p[l-1] == '\n')) { 1429 for (p = buf; p < end; p++) { 1430 if (*p == '\n') { 1431 evbuffer_drain(bufev->output, p - buf + 1); 1432 break; 1433 } 1434 } 1435 /* Without '\n' discard everything. */ 1436 if (p == end) 1437 evbuffer_drain(bufev->output, -1); 1438 log_debug("loghost \"%s\" dropped partial message", 1439 f->f_un.f_forw.f_loghost); 1440 f->f_dropped++; 1441 } 1442 1443 tcp_connect_retry(bufev, f); 1444 1445 /* Log the connection error to the fresh buffer after reconnecting. */ 1446 log_info(LOG_WARNING, "%s", ebuf); 1447 } 1448 1449 void 1450 tcp_connectcb(int fd, short event, void *arg) 1451 { 1452 struct filed *f = arg; 1453 struct bufferevent *bufev = f->f_un.f_forw.f_bufev; 1454 int s; 1455 1456 if ((s = tcp_socket(f)) == -1) { 1457 tcp_connect_retry(bufev, f); 1458 return; 1459 } 1460 log_debug("tcp connect callback: socket success, event %#x", event); 1461 f->f_file = s; 1462 1463 bufferevent_setfd(bufev, s); 1464 bufferevent_setcb(bufev, tcp_dropcb, tcp_writecb, tcp_errorcb, f); 1465 /* 1466 * Although syslog is a write only protocol, enable reading from 1467 * the socket to detect connection close and errors. 1468 */ 1469 bufferevent_enable(bufev, EV_READ|EV_WRITE); 1470 1471 if (f->f_type == F_FORWTLS) { 1472 if ((f->f_un.f_forw.f_ctx = tls_client()) == NULL) { 1473 log_warn("tls_client \"%s\"", f->f_un.f_forw.f_loghost); 1474 goto error; 1475 } 1476 if (client_config && 1477 tls_configure(f->f_un.f_forw.f_ctx, client_config) == -1) { 1478 log_warnx("tls_configure \"%s\": %s", 1479 f->f_un.f_forw.f_loghost, 1480 tls_error(f->f_un.f_forw.f_ctx)); 1481 goto error; 1482 } 1483 if (tls_connect_socket(f->f_un.f_forw.f_ctx, s, 1484 f->f_un.f_forw.f_host) == -1) { 1485 log_warnx("tls_connect_socket \"%s\": %s", 1486 f->f_un.f_forw.f_loghost, 1487 tls_error(f->f_un.f_forw.f_ctx)); 1488 goto error; 1489 } 1490 log_debug("tcp connect callback: tls context success"); 1491 1492 buffertls_set(&f->f_un.f_forw.f_buftls, bufev, 1493 f->f_un.f_forw.f_ctx, s); 1494 buffertls_connect(&f->f_un.f_forw.f_buftls, s); 1495 } 1496 1497 return; 1498 1499 error: 1500 if (f->f_un.f_forw.f_ctx) { 1501 tls_free(f->f_un.f_forw.f_ctx); 1502 f->f_un.f_forw.f_ctx = NULL; 1503 } 1504 close(f->f_file); 1505 f->f_file = -1; 1506 tcp_connect_retry(bufev, f); 1507 } 1508 1509 void 1510 tcp_connect_retry(struct bufferevent *bufev, struct filed *f) 1511 { 1512 struct timeval to; 1513 1514 if (f->f_un.f_forw.f_reconnectwait == 0) 1515 f->f_un.f_forw.f_reconnectwait = 1; 1516 else 1517 f->f_un.f_forw.f_reconnectwait <<= 1; 1518 if (f->f_un.f_forw.f_reconnectwait > 600) 1519 f->f_un.f_forw.f_reconnectwait = 600; 1520 to.tv_sec = f->f_un.f_forw.f_reconnectwait; 1521 to.tv_usec = 0; 1522 1523 log_debug("tcp connect retry: wait %d", 1524 f->f_un.f_forw.f_reconnectwait); 1525 bufferevent_setfd(bufev, -1); 1526 /* We can reuse the write event as bufferevent is disabled. */ 1527 evtimer_set(&bufev->ev_write, tcp_connectcb, f); 1528 evtimer_add(&bufev->ev_write, &to); 1529 } 1530 1531 int 1532 tcpbuf_countmsg(struct bufferevent *bufev) 1533 { 1534 char *p, *buf, *end; 1535 int i = 0; 1536 1537 buf = EVBUFFER_DATA(bufev->output); 1538 end = buf + EVBUFFER_LENGTH(bufev->output); 1539 for (p = buf; p < end; p++) { 1540 if (*p == '\n') 1541 i++; 1542 } 1543 return (i); 1544 } 1545 1546 void 1547 usage(void) 1548 { 1549 1550 (void)fprintf(stderr, 1551 "usage: syslogd [-46dFhnruVZ] [-a path] [-C CAfile]\n" 1552 "\t[-c cert_file] [-f config_file] [-K CAfile] [-k key_file]\n" 1553 "\t[-m mark_interval] [-p log_socket] [-S listen_address]\n" 1554 "\t[-s reporting_socket] [-T listen_address] [-U bind_address]\n"); 1555 exit(1); 1556 } 1557 1558 /* 1559 * Parse a priority code of the form "<123>" into pri, and return the 1560 * length of the priority code including the surrounding angle brackets. 1561 */ 1562 size_t 1563 parsepriority(const char *msg, int *pri) 1564 { 1565 size_t nlen; 1566 char buf[11]; 1567 const char *errstr; 1568 int maybepri; 1569 1570 if (*msg++ == '<') { 1571 nlen = strspn(msg, "1234567890"); 1572 if (nlen > 0 && nlen < sizeof(buf) && msg[nlen] == '>') { 1573 strlcpy(buf, msg, nlen + 1); 1574 maybepri = strtonum(buf, 0, INT_MAX, &errstr); 1575 if (errstr == NULL) { 1576 *pri = maybepri; 1577 return nlen + 2; 1578 } 1579 } 1580 } 1581 1582 return 0; 1583 } 1584 1585 /* 1586 * Take a raw input line, decode the message, and print the message 1587 * on the appropriate log files. 1588 */ 1589 void 1590 printline(char *hname, char *msg) 1591 { 1592 int pri; 1593 char *p, *q, line[LOG_MAXLINE + 4 + 1]; /* message, encoding, NUL */ 1594 1595 /* test for special codes */ 1596 pri = DEFUPRI; 1597 p = msg; 1598 p += parsepriority(p, &pri); 1599 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1600 pri = DEFUPRI; 1601 1602 /* 1603 * Don't allow users to log kernel messages. 1604 * NOTE: since LOG_KERN == 0 this will also match 1605 * messages with no facility specified. 1606 */ 1607 if (LOG_FAC(pri) == LOG_KERN) 1608 pri = LOG_USER | LOG_PRI(pri); 1609 1610 for (q = line; *p && q < &line[LOG_MAXLINE]; p++) { 1611 if (*p == '\n') 1612 *q++ = ' '; 1613 else 1614 q = vis(q, *p, 0, 0); 1615 } 1616 line[LOG_MAXLINE] = *q = '\0'; 1617 1618 logline(pri, 0, hname, line); 1619 } 1620 1621 /* 1622 * Take a raw input line from /dev/klog, split and format similar to syslog(). 1623 */ 1624 void 1625 printsys(char *msg) 1626 { 1627 int c, pri, flags; 1628 char *lp, *p, *q, line[LOG_MAXLINE + 1]; 1629 size_t prilen; 1630 int l; 1631 1632 l = snprintf(line, sizeof(line), "%s: ", _PATH_UNIX); 1633 if (l < 0 || l >= sizeof(line)) { 1634 line[0] = '\0'; 1635 l = 0; 1636 } 1637 lp = line + l; 1638 for (p = msg; *p != '\0'; ) { 1639 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 1640 pri = DEFSPRI; 1641 prilen = parsepriority(p, &pri); 1642 p += prilen; 1643 if (prilen == 0) { 1644 /* kernel printf's come out on console */ 1645 flags |= IGN_CONS; 1646 } 1647 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1648 pri = DEFSPRI; 1649 1650 q = lp; 1651 while (*p && (c = *p++) != '\n' && q < &line[sizeof(line) - 4]) 1652 q = vis(q, c, 0, 0); 1653 1654 logline(pri, flags, LocalHostName, line); 1655 } 1656 } 1657 1658 void 1659 vlogmsg(int pri, const char *proc, const char *fmt, va_list ap) 1660 { 1661 char msg[ERRBUFSIZE]; 1662 int l; 1663 1664 l = snprintf(msg, sizeof(msg), "%s[%d]: ", proc, getpid()); 1665 if (l < 0 || l >= sizeof(msg)) 1666 l = 0; 1667 l = vsnprintf(msg + l, sizeof(msg) - l, fmt, ap); 1668 if (l < 0) 1669 strlcpy(msg, fmt, sizeof(msg)); 1670 1671 if (!Started) { 1672 fprintf(stderr, "%s\n", msg); 1673 init_dropped++; 1674 return; 1675 } 1676 logline(pri, ADDDATE, LocalHostName, msg); 1677 } 1678 1679 struct timeval now; 1680 1681 /* 1682 * Log a message to the appropriate log files, users, etc. based on 1683 * the priority. 1684 */ 1685 void 1686 logline(int pri, int flags, char *from, char *msg) 1687 { 1688 struct filed *f; 1689 int fac, msglen, prilev, i; 1690 char timestamp[33]; 1691 char prog[NAME_MAX+1]; 1692 1693 log_debug("logline: pri 0%o, flags 0x%x, from %s, msg %s", 1694 pri, flags, from, msg); 1695 1696 /* 1697 * Check to see if msg looks non-standard. 1698 */ 1699 timestamp[0] = '\0'; 1700 msglen = strlen(msg); 1701 if ((flags & ADDDATE) == 0) { 1702 if (msglen >= 16 && msg[3] == ' ' && msg[6] == ' ' && 1703 msg[9] == ':' && msg[12] == ':' && msg[15] == ' ') { 1704 /* BSD syslog TIMESTAMP, RFC 3164 */ 1705 strlcpy(timestamp, msg, 16); 1706 msg += 16; 1707 msglen -= 16; 1708 if (ZuluTime) 1709 flags |= ADDDATE; 1710 } else if (msglen >= 20 && 1711 isdigit(msg[0]) && isdigit(msg[1]) && isdigit(msg[2]) && 1712 isdigit(msg[3]) && msg[4] == '-' && 1713 isdigit(msg[5]) && isdigit(msg[6]) && msg[7] == '-' && 1714 isdigit(msg[8]) && isdigit(msg[9]) && msg[10] == 'T' && 1715 isdigit(msg[11]) && isdigit(msg[12]) && msg[13] == ':' && 1716 isdigit(msg[14]) && isdigit(msg[15]) && msg[16] == ':' && 1717 isdigit(msg[17]) && isdigit(msg[18]) && (msg[19] == '.' || 1718 msg[19] == 'Z' || msg[19] == '+' || msg[19] == '-')) { 1719 /* FULL-DATE "T" FULL-TIME, RFC 5424 */ 1720 strlcpy(timestamp, msg, sizeof(timestamp)); 1721 msg += 19; 1722 msglen -= 19; 1723 i = 0; 1724 if (msglen >= 3 && msg[0] == '.' && isdigit(msg[1])) { 1725 /* TIME-SECFRAC */ 1726 msg += 2; 1727 msglen -= 2; 1728 i += 2; 1729 while(i < 7 && msglen >= 1 && isdigit(msg[0])) { 1730 msg++; 1731 msglen--; 1732 i++; 1733 } 1734 } 1735 if (msglen >= 2 && msg[0] == 'Z' && msg[1] == ' ') { 1736 /* "Z" */ 1737 timestamp[20+i] = '\0'; 1738 msg += 2; 1739 msglen -= 2; 1740 } else if (msglen >= 7 && 1741 (msg[0] == '+' || msg[0] == '-') && 1742 isdigit(msg[1]) && isdigit(msg[2]) && 1743 msg[3] == ':' && 1744 isdigit(msg[4]) && isdigit(msg[5]) && 1745 msg[6] == ' ') { 1746 /* TIME-NUMOFFSET */ 1747 timestamp[25+i] = '\0'; 1748 msg += 7; 1749 msglen -= 7; 1750 } else { 1751 /* invalid time format, roll back */ 1752 timestamp[0] = '\0'; 1753 msg -= 19 + i; 1754 msglen += 19 + i; 1755 flags |= ADDDATE; 1756 } 1757 } else if (msglen >= 2 && msg[0] == '-' && msg[1] == ' ') { 1758 /* NILVALUE, RFC 5424 */ 1759 msg += 2; 1760 msglen -= 2; 1761 flags |= ADDDATE; 1762 } else 1763 flags |= ADDDATE; 1764 } 1765 1766 (void)gettimeofday(&now, NULL); 1767 if (flags & ADDDATE) { 1768 if (ZuluTime) { 1769 struct tm *tm; 1770 size_t l; 1771 1772 tm = gmtime(&now.tv_sec); 1773 l = strftime(timestamp, sizeof(timestamp), "%FT%T", tm); 1774 /* 1775 * Use only millisecond precision as some time has 1776 * passed since syslog(3) was called. 1777 */ 1778 snprintf(timestamp + l, sizeof(timestamp) - l, 1779 ".%03ldZ", now.tv_usec / 1000); 1780 } else 1781 strlcpy(timestamp, ctime(&now.tv_sec) + 4, 16); 1782 } 1783 1784 /* extract facility and priority level */ 1785 if (flags & MARK) 1786 fac = LOG_NFACILITIES; 1787 else { 1788 fac = LOG_FAC(pri); 1789 if (fac >= LOG_NFACILITIES || fac < 0) 1790 fac = LOG_USER; 1791 } 1792 prilev = LOG_PRI(pri); 1793 1794 /* extract program name */ 1795 while (isspace((unsigned char)*msg)) { 1796 msg++; 1797 msglen--; 1798 } 1799 for (i = 0; i < NAME_MAX; i++) { 1800 if (!isalnum((unsigned char)msg[i]) && 1801 msg[i] != '-' && msg[i] != '.' && msg[i] != '_') 1802 break; 1803 prog[i] = msg[i]; 1804 } 1805 prog[i] = 0; 1806 1807 /* log the message to the particular outputs */ 1808 if (!Initialized) { 1809 f = &consfile; 1810 if (f->f_type == F_CONSOLE) { 1811 strlcpy(f->f_lasttime, timestamp, 1812 sizeof(f->f_lasttime)); 1813 strlcpy(f->f_prevhost, from, 1814 sizeof(f->f_prevhost)); 1815 fprintlog(f, flags, msg); 1816 /* May be set to F_UNUSED, try again next time. */ 1817 f->f_type = F_CONSOLE; 1818 } 1819 init_dropped++; 1820 return; 1821 } 1822 SIMPLEQ_FOREACH(f, &Files, f_next) { 1823 /* skip messages that are incorrect priority */ 1824 if (f->f_pmask[fac] < prilev || 1825 f->f_pmask[fac] == INTERNAL_NOPRI) 1826 continue; 1827 1828 /* skip messages with the incorrect program or hostname */ 1829 if (f->f_program && fnmatch(f->f_program, prog, 0) != 0) 1830 continue; 1831 if (f->f_hostname && fnmatch(f->f_hostname, from, 0) != 0) 1832 continue; 1833 1834 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1835 continue; 1836 1837 /* don't output marks to recently written files */ 1838 if ((flags & MARK) && 1839 (now.tv_sec - f->f_time) < MarkInterval / 2) 1840 continue; 1841 1842 /* 1843 * suppress duplicate lines to this file 1844 */ 1845 if ((Repeat == 0 || (Repeat == 1 && 1846 (f->f_type != F_PIPE && f->f_type != F_FORWUDP && 1847 f->f_type != F_FORWTCP && f->f_type != F_FORWTLS))) && 1848 (flags & MARK) == 0 && msglen == f->f_prevlen && 1849 !strcmp(msg, f->f_prevline) && 1850 !strcmp(from, f->f_prevhost)) { 1851 strlcpy(f->f_lasttime, timestamp, 1852 sizeof(f->f_lasttime)); 1853 f->f_prevcount++; 1854 log_debug("msg repeated %d times, %ld sec of %d", 1855 f->f_prevcount, (long)(now.tv_sec - f->f_time), 1856 repeatinterval[f->f_repeatcount]); 1857 /* 1858 * If domark would have logged this by now, 1859 * flush it now (so we don't hold isolated messages), 1860 * but back off so we'll flush less often 1861 * in the future. 1862 */ 1863 if (now.tv_sec > REPEATTIME(f)) { 1864 fprintlog(f, flags, (char *)NULL); 1865 BACKOFF(f); 1866 } 1867 } else { 1868 /* new line, save it */ 1869 if (f->f_prevcount) 1870 fprintlog(f, 0, (char *)NULL); 1871 f->f_repeatcount = 0; 1872 f->f_prevpri = pri; 1873 strlcpy(f->f_lasttime, timestamp, 1874 sizeof(f->f_lasttime)); 1875 strlcpy(f->f_prevhost, from, 1876 sizeof(f->f_prevhost)); 1877 if (msglen < MAXSVLINE) { 1878 f->f_prevlen = msglen; 1879 strlcpy(f->f_prevline, msg, 1880 sizeof(f->f_prevline)); 1881 fprintlog(f, flags, (char *)NULL); 1882 } else { 1883 f->f_prevline[0] = 0; 1884 f->f_prevlen = 0; 1885 fprintlog(f, flags, msg); 1886 } 1887 } 1888 1889 if (f->f_quick) 1890 break; 1891 } 1892 } 1893 1894 void 1895 fprintlog(struct filed *f, int flags, char *msg) 1896 { 1897 struct iovec iov[6]; 1898 struct iovec *v; 1899 int l, retryonce; 1900 char line[LOG_MAXLINE + 1], repbuf[80], greetings[500]; 1901 char ebuf[ERRBUFSIZE]; 1902 1903 v = iov; 1904 if (f->f_type == F_WALL) { 1905 l = snprintf(greetings, sizeof(greetings), 1906 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1907 f->f_prevhost, ctime(&now.tv_sec)); 1908 if (l < 0) 1909 l = strlcpy(greetings, 1910 "\r\n\7Message from syslogd ...\r\n", 1911 sizeof(greetings)); 1912 if (l >= sizeof(greetings)) 1913 l = sizeof(greetings) - 1; 1914 v->iov_base = greetings; 1915 v->iov_len = l; 1916 v++; 1917 v->iov_base = ""; 1918 v->iov_len = 0; 1919 v++; 1920 } else if (f->f_lasttime[0] != '\0') { 1921 v->iov_base = f->f_lasttime; 1922 v->iov_len = strlen(f->f_lasttime); 1923 v++; 1924 v->iov_base = " "; 1925 v->iov_len = 1; 1926 v++; 1927 } else { 1928 v->iov_base = ""; 1929 v->iov_len = 0; 1930 v++; 1931 v->iov_base = ""; 1932 v->iov_len = 0; 1933 v++; 1934 } 1935 if (f->f_prevhost[0] != '\0') { 1936 v->iov_base = f->f_prevhost; 1937 v->iov_len = strlen(v->iov_base); 1938 v++; 1939 v->iov_base = " "; 1940 v->iov_len = 1; 1941 v++; 1942 } else { 1943 v->iov_base = ""; 1944 v->iov_len = 0; 1945 v++; 1946 v->iov_base = ""; 1947 v->iov_len = 0; 1948 v++; 1949 } 1950 1951 if (msg) { 1952 v->iov_base = msg; 1953 v->iov_len = strlen(msg); 1954 } else if (f->f_prevcount > 1) { 1955 l = snprintf(repbuf, sizeof(repbuf), 1956 "last message repeated %d times", f->f_prevcount); 1957 if (l < 0) 1958 l = strlcpy(repbuf, "last message repeated", 1959 sizeof(repbuf)); 1960 if (l >= sizeof(repbuf)) 1961 l = sizeof(repbuf) - 1; 1962 v->iov_base = repbuf; 1963 v->iov_len = l; 1964 } else { 1965 v->iov_base = f->f_prevline; 1966 v->iov_len = f->f_prevlen; 1967 } 1968 v++; 1969 1970 log_debugadd("Logging to %s", TypeNames[f->f_type]); 1971 f->f_time = now.tv_sec; 1972 1973 switch (f->f_type) { 1974 case F_UNUSED: 1975 log_debug("%s", ""); 1976 break; 1977 1978 case F_FORWUDP: 1979 log_debug(" %s", f->f_un.f_forw.f_loghost); 1980 l = snprintf(line, MINIMUM(MAX_UDPMSG + 1, sizeof(line)), 1981 "<%d>%.32s %s%s%s", f->f_prevpri, (char *)iov[0].iov_base, 1982 IncludeHostname ? LocalHostName : "", 1983 IncludeHostname ? " " : "", 1984 (char *)iov[4].iov_base); 1985 if (l < 0) 1986 l = strlcpy(line, iov[4].iov_base, sizeof(line)); 1987 if (l >= sizeof(line)) 1988 l = sizeof(line) - 1; 1989 if (l >= MAX_UDPMSG + 1) 1990 l = MAX_UDPMSG; 1991 if (sendto(f->f_file, line, l, 0, 1992 (struct sockaddr *)&f->f_un.f_forw.f_addr, 1993 f->f_un.f_forw.f_addr.ss_len) != l) { 1994 switch (errno) { 1995 case EADDRNOTAVAIL: 1996 case EHOSTDOWN: 1997 case EHOSTUNREACH: 1998 case ENETDOWN: 1999 case ENETUNREACH: 2000 case ENOBUFS: 2001 case EWOULDBLOCK: 2002 /* silently dropped */ 2003 break; 2004 default: 2005 f->f_type = F_UNUSED; 2006 log_warn("sendto \"%s\"", 2007 f->f_un.f_forw.f_loghost); 2008 break; 2009 } 2010 } 2011 break; 2012 2013 case F_FORWTCP: 2014 case F_FORWTLS: 2015 log_debugadd(" %s", f->f_un.f_forw.f_loghost); 2016 if (EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->output) >= 2017 MAX_TCPBUF) { 2018 log_debug(" (dropped)"); 2019 f->f_dropped++; 2020 break; 2021 } 2022 /* 2023 * Syslog over TLS RFC 5425 4.3. Sending Data 2024 * Syslog over TCP RFC 6587 3.4.1. Octet Counting 2025 * Use an additional '\n' to split messages. This allows 2026 * buffer synchronisation, helps legacy implementations, 2027 * and makes line based testing easier. 2028 */ 2029 l = snprintf(line, sizeof(line), "<%d>%.32s %s%s\n", 2030 f->f_prevpri, (char *)iov[0].iov_base, 2031 IncludeHostname ? LocalHostName : "", 2032 IncludeHostname ? " " : ""); 2033 if (l < 0) { 2034 log_debug(" (dropped snprintf)"); 2035 f->f_dropped++; 2036 break; 2037 } 2038 l = evbuffer_add_printf(f->f_un.f_forw.f_bufev->output, 2039 "%zu <%d>%.32s %s%s%s\n", 2040 (size_t)l + strlen(iov[4].iov_base), 2041 f->f_prevpri, (char *)iov[0].iov_base, 2042 IncludeHostname ? LocalHostName : "", 2043 IncludeHostname ? " " : "", 2044 (char *)iov[4].iov_base); 2045 if (l < 0) { 2046 log_debug(" (dropped evbuffer_add_printf)"); 2047 f->f_dropped++; 2048 break; 2049 } 2050 bufferevent_enable(f->f_un.f_forw.f_bufev, EV_WRITE); 2051 log_debug("%s", ""); 2052 break; 2053 2054 case F_CONSOLE: 2055 if (flags & IGN_CONS) { 2056 log_debug(" (ignored)"); 2057 break; 2058 } 2059 /* FALLTHROUGH */ 2060 2061 case F_TTY: 2062 case F_FILE: 2063 case F_PIPE: 2064 log_debug(" %s", f->f_un.f_fname); 2065 if (f->f_type != F_FILE && f->f_type != F_PIPE) { 2066 v->iov_base = "\r\n"; 2067 v->iov_len = 2; 2068 } else { 2069 v->iov_base = "\n"; 2070 v->iov_len = 1; 2071 } 2072 retryonce = 0; 2073 again: 2074 if (writev(f->f_file, iov, 6) == -1) { 2075 int e = errno; 2076 2077 /* allow to recover from file system full */ 2078 if (e == ENOSPC && f->f_type == F_FILE) { 2079 if (f->f_dropped++ == 0) { 2080 f->f_type = F_UNUSED; 2081 errno = e; 2082 log_warn("write to file \"%s\"", 2083 f->f_un.f_fname); 2084 f->f_type = F_FILE; 2085 } 2086 break; 2087 } 2088 2089 /* pipe is non-blocking. log and drop message if full */ 2090 if (e == EAGAIN && f->f_type == F_PIPE) { 2091 if (now.tv_sec - f->f_lasterrtime > 120) { 2092 f->f_lasterrtime = now.tv_sec; 2093 log_warn("write to pipe \"%s\"", 2094 f->f_un.f_fname); 2095 } 2096 break; 2097 } 2098 2099 /* 2100 * Check for errors on TTY's or program pipes. 2101 * Errors happen due to loss of tty or died programs. 2102 */ 2103 if (e == EAGAIN) { 2104 /* 2105 * Silently drop messages on blocked write. 2106 * This can happen when logging to a locked tty. 2107 */ 2108 break; 2109 } 2110 2111 (void)close(f->f_file); 2112 if ((e == EIO || e == EBADF) && 2113 f->f_type != F_FILE && f->f_type != F_PIPE && 2114 !retryonce) { 2115 f->f_file = priv_open_tty(f->f_un.f_fname); 2116 retryonce = 1; 2117 if (f->f_file < 0) { 2118 f->f_type = F_UNUSED; 2119 log_warn("priv_open_tty \"%s\"", 2120 f->f_un.f_fname); 2121 } else 2122 goto again; 2123 } else if ((e == EPIPE || e == EBADF) && 2124 f->f_type == F_PIPE && !retryonce) { 2125 f->f_file = priv_open_log(f->f_un.f_fname); 2126 retryonce = 1; 2127 if (f->f_file < 0) { 2128 f->f_type = F_UNUSED; 2129 log_warn("priv_open_log \"%s\"", 2130 f->f_un.f_fname); 2131 } else 2132 goto again; 2133 } else { 2134 f->f_type = F_UNUSED; 2135 f->f_file = -1; 2136 errno = e; 2137 log_warn("writev \"%s\"", f->f_un.f_fname); 2138 } 2139 } else { 2140 if (flags & SYNC_FILE) 2141 (void)fsync(f->f_file); 2142 if (f->f_dropped && f->f_type == F_FILE) { 2143 snprintf(ebuf, sizeof(ebuf), "to file \"%s\"", 2144 f->f_un.f_fname); 2145 dropped_warn(&f->f_dropped, ebuf); 2146 } 2147 } 2148 break; 2149 2150 case F_USERS: 2151 case F_WALL: 2152 log_debug("%s", ""); 2153 v->iov_base = "\r\n"; 2154 v->iov_len = 2; 2155 wallmsg(f, iov); 2156 break; 2157 2158 case F_MEMBUF: 2159 log_debug("%s", ""); 2160 l = snprintf(line, sizeof(line), "%.32s %s %s", 2161 (char *)iov[0].iov_base, (char *)iov[2].iov_base, 2162 (char *)iov[4].iov_base); 2163 if (l < 0) 2164 l = strlcpy(line, iov[4].iov_base, sizeof(line)); 2165 if (ringbuf_append_line(f->f_un.f_mb.f_rb, line) == 1) 2166 f->f_un.f_mb.f_overflow = 1; 2167 if (f->f_un.f_mb.f_attached) 2168 ctlconn_logto(line); 2169 break; 2170 } 2171 f->f_prevcount = 0; 2172 } 2173 2174 /* 2175 * WALLMSG -- Write a message to the world at large 2176 * 2177 * Write the specified message to either the entire 2178 * world, or a list of approved users. 2179 */ 2180 void 2181 wallmsg(struct filed *f, struct iovec *iov) 2182 { 2183 struct utmp ut; 2184 char utline[sizeof(ut.ut_line) + 1]; 2185 static int reenter; /* avoid calling ourselves */ 2186 FILE *uf; 2187 int i; 2188 2189 if (reenter++) 2190 return; 2191 if ((uf = priv_open_utmp()) == NULL) { 2192 log_warn("priv_open_utmp"); 2193 reenter = 0; 2194 return; 2195 } 2196 while (fread(&ut, sizeof(ut), 1, uf) == 1) { 2197 if (ut.ut_name[0] == '\0') 2198 continue; 2199 /* must use strncpy since ut_* may not be NUL terminated */ 2200 strncpy(utline, ut.ut_line, sizeof(utline) - 1); 2201 utline[sizeof(utline) - 1] = '\0'; 2202 if (f->f_type == F_WALL) { 2203 ttymsg(iov, 6, utline); 2204 continue; 2205 } 2206 /* should we send the message to this user? */ 2207 for (i = 0; i < MAXUNAMES; i++) { 2208 if (!f->f_un.f_uname[i][0]) 2209 break; 2210 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 2211 UT_NAMESIZE)) { 2212 ttymsg(iov, 6, utline); 2213 break; 2214 } 2215 } 2216 } 2217 (void)fclose(uf); 2218 reenter = 0; 2219 } 2220 2221 /* 2222 * Return a printable representation of a host address. 2223 */ 2224 void 2225 cvthname(struct sockaddr *f, char *result, size_t res_len) 2226 { 2227 if (getnameinfo(f, f->sa_len, result, res_len, NULL, 0, 2228 NI_NUMERICHOST|NI_NUMERICSERV|NI_DGRAM) != 0) { 2229 log_debug("Malformed from address"); 2230 strlcpy(result, hostname_unknown, res_len); 2231 return; 2232 } 2233 log_debug("cvthname(%s)", result); 2234 if (NoDNS) 2235 return; 2236 2237 if (priv_getnameinfo(f, f->sa_len, result, res_len) != 0) 2238 log_debug("Host name for from address (%s) unknown", result); 2239 } 2240 2241 void 2242 die_signalcb(int signum, short event, void *arg) 2243 { 2244 die(signum); 2245 } 2246 2247 void 2248 mark_timercb(int unused, short event, void *arg) 2249 { 2250 struct event *ev = arg; 2251 struct timeval to; 2252 2253 markit(); 2254 2255 to.tv_sec = TIMERINTVL; 2256 to.tv_usec = 0; 2257 evtimer_add(ev, &to); 2258 } 2259 2260 void 2261 init_signalcb(int signum, short event, void *arg) 2262 { 2263 init(); 2264 log_info(LOG_INFO, "restart"); 2265 2266 dropped_warn(&file_dropped, "to file"); 2267 dropped_warn(&tcpbuf_dropped, "to remote loghost"); 2268 log_debug("syslogd: restarted"); 2269 } 2270 2271 void 2272 logevent(int severity, const char *msg) 2273 { 2274 log_debug("libevent: [%d] %s", severity, msg); 2275 } 2276 2277 void 2278 dropped_warn(int *count, const char *what) 2279 { 2280 int dropped; 2281 2282 if (*count == 0) 2283 return; 2284 2285 dropped = *count; 2286 *count = 0; 2287 log_info(LOG_WARNING, "dropped %d message%s %s", 2288 dropped, dropped == 1 ? "" : "s", what); 2289 } 2290 2291 __dead void 2292 die(int signo) 2293 { 2294 struct filed *f; 2295 2296 SIMPLEQ_FOREACH(f, &Files, f_next) { 2297 /* flush any pending output */ 2298 if (f->f_prevcount) 2299 fprintlog(f, 0, (char *)NULL); 2300 if (f->f_type == F_FORWTLS || f->f_type == F_FORWTCP) { 2301 tcpbuf_dropped += f->f_dropped + 2302 tcpbuf_countmsg(f->f_un.f_forw.f_bufev); 2303 f->f_dropped = 0; 2304 } 2305 if (f->f_type == F_FILE) { 2306 file_dropped += f->f_dropped; 2307 f->f_dropped = 0; 2308 } 2309 } 2310 dropped_warn(&init_dropped, "during initialization"); 2311 dropped_warn(&file_dropped, "to file"); 2312 dropped_warn(&tcpbuf_dropped, "to remote loghost"); 2313 2314 if (signo) 2315 log_info(LOG_ERR, "exiting on signal %d", signo); 2316 log_debug("syslogd: exited"); 2317 exit(0); 2318 } 2319 2320 /* 2321 * INIT -- Initialize syslogd from configuration table 2322 */ 2323 void 2324 init(void) 2325 { 2326 char progblock[NAME_MAX+1], hostblock[NAME_MAX+1], *cline, *p, *q; 2327 struct filed_list mb; 2328 struct filed *f, *m; 2329 FILE *cf; 2330 int i; 2331 size_t s; 2332 2333 log_debug("init"); 2334 2335 /* If config file has been modified, then just die to restart */ 2336 if (priv_config_modified()) { 2337 log_debug("config file changed: dying"); 2338 die(0); 2339 } 2340 2341 /* 2342 * Close all open log files. 2343 */ 2344 Initialized = 0; 2345 SIMPLEQ_INIT(&mb); 2346 while (!SIMPLEQ_EMPTY(&Files)) { 2347 f = SIMPLEQ_FIRST(&Files); 2348 SIMPLEQ_REMOVE_HEAD(&Files, f_next); 2349 /* flush any pending output */ 2350 if (f->f_prevcount) 2351 fprintlog(f, 0, (char *)NULL); 2352 2353 switch (f->f_type) { 2354 case F_FORWTLS: 2355 if (f->f_un.f_forw.f_ctx) { 2356 tls_close(f->f_un.f_forw.f_ctx); 2357 tls_free(f->f_un.f_forw.f_ctx); 2358 } 2359 free(f->f_un.f_forw.f_host); 2360 /* FALLTHROUGH */ 2361 case F_FORWTCP: 2362 tcpbuf_dropped += f->f_dropped + 2363 tcpbuf_countmsg(f->f_un.f_forw.f_bufev); 2364 bufferevent_free(f->f_un.f_forw.f_bufev); 2365 /* FALLTHROUGH */ 2366 case F_FILE: 2367 if (f->f_type == F_FILE) { 2368 file_dropped += f->f_dropped; 2369 f->f_dropped = 0; 2370 } 2371 case F_TTY: 2372 case F_CONSOLE: 2373 case F_PIPE: 2374 (void)close(f->f_file); 2375 break; 2376 } 2377 free(f->f_program); 2378 free(f->f_hostname); 2379 if (f->f_type == F_MEMBUF) { 2380 f->f_program = NULL; 2381 f->f_hostname = NULL; 2382 log_debug("add %p to mb", f); 2383 SIMPLEQ_INSERT_HEAD(&mb, f, f_next); 2384 } else 2385 free(f); 2386 } 2387 SIMPLEQ_INIT(&Files); 2388 2389 /* open the configuration file */ 2390 if ((cf = priv_open_config()) == NULL) { 2391 log_debug("cannot open %s", ConfFile); 2392 SIMPLEQ_INSERT_TAIL(&Files, 2393 cfline("*.ERR\t/dev/console", "*", "*"), f_next); 2394 SIMPLEQ_INSERT_TAIL(&Files, 2395 cfline("*.PANIC\t*", "*", "*"), f_next); 2396 Initialized = 1; 2397 dropped_warn(&init_dropped, "during initialization"); 2398 return; 2399 } 2400 2401 /* 2402 * Foreach line in the conf table, open that file. 2403 */ 2404 cline = NULL; 2405 s = 0; 2406 strlcpy(progblock, "*", sizeof(progblock)); 2407 strlcpy(hostblock, "*", sizeof(hostblock)); 2408 send_udp = send_udp6 = 0; 2409 while (getline(&cline, &s, cf) != -1) { 2410 /* 2411 * check for end-of-section, comments, strip off trailing 2412 * spaces and newline character. !progblock and +hostblock 2413 * are treated specially: the following lines apply only to 2414 * that program. 2415 */ 2416 for (p = cline; isspace((unsigned char)*p); ++p) 2417 continue; 2418 if (*p == '\0' || *p == '#') 2419 continue; 2420 if (*p == '!' || *p == '+') { 2421 q = (*p == '!') ? progblock : hostblock; 2422 p++; 2423 while (isspace((unsigned char)*p)) 2424 p++; 2425 if (*p == '\0' || (*p == '*' && (p[1] == '\0' || 2426 isspace((unsigned char)p[1])))) { 2427 strlcpy(q, "*", NAME_MAX+1); 2428 continue; 2429 } 2430 for (i = 0; i < NAME_MAX; i++) { 2431 if (*p == '\0' || isspace((unsigned char)*p)) 2432 break; 2433 *q++ = *p++; 2434 } 2435 *q = '\0'; 2436 continue; 2437 } 2438 2439 p = cline + strlen(cline); 2440 while (p > cline) 2441 if (!isspace((unsigned char)*--p)) { 2442 p++; 2443 break; 2444 } 2445 *p = '\0'; 2446 f = cfline(cline, progblock, hostblock); 2447 if (f != NULL) 2448 SIMPLEQ_INSERT_TAIL(&Files, f, f_next); 2449 } 2450 free(cline); 2451 if (!feof(cf)) 2452 fatal("read config file"); 2453 2454 /* Match and initialize the memory buffers */ 2455 SIMPLEQ_FOREACH(f, &Files, f_next) { 2456 if (f->f_type != F_MEMBUF) 2457 continue; 2458 log_debug("Initialize membuf %s at %p", 2459 f->f_un.f_mb.f_mname, f); 2460 2461 SIMPLEQ_FOREACH(m, &mb, f_next) { 2462 if (m->f_un.f_mb.f_rb == NULL) 2463 continue; 2464 if (strcmp(m->f_un.f_mb.f_mname, 2465 f->f_un.f_mb.f_mname) == 0) 2466 break; 2467 } 2468 if (m == NULL) { 2469 log_debug("Membuf no match"); 2470 f->f_un.f_mb.f_rb = ringbuf_init(f->f_un.f_mb.f_len); 2471 if (f->f_un.f_mb.f_rb == NULL) { 2472 f->f_type = F_UNUSED; 2473 log_warn("allocate membuf"); 2474 } 2475 } else { 2476 log_debug("Membuf match f:%p, m:%p", f, m); 2477 f->f_un = m->f_un; 2478 m->f_un.f_mb.f_rb = NULL; 2479 } 2480 } 2481 2482 /* make sure remaining buffers are freed */ 2483 while (!SIMPLEQ_EMPTY(&mb)) { 2484 m = SIMPLEQ_FIRST(&mb); 2485 SIMPLEQ_REMOVE_HEAD(&mb, f_next); 2486 if (m->f_un.f_mb.f_rb != NULL) { 2487 log_warnx("mismatched membuf"); 2488 ringbuf_free(m->f_un.f_mb.f_rb); 2489 } 2490 log_debug("Freeing membuf %p", m); 2491 2492 free(m); 2493 } 2494 2495 /* close the configuration file */ 2496 (void)fclose(cf); 2497 2498 Initialized = 1; 2499 dropped_warn(&init_dropped, "during initialization"); 2500 2501 if (SecureMode) { 2502 /* 2503 * If generic UDP file descriptors are used neither 2504 * for receiving nor for sending, close them. Then 2505 * there is no useless *.514 in netstat. 2506 */ 2507 if (fd_udp != -1 && !send_udp) { 2508 close(fd_udp); 2509 fd_udp = -1; 2510 } 2511 if (fd_udp6 != -1 && !send_udp6) { 2512 close(fd_udp6); 2513 fd_udp6 = -1; 2514 } 2515 } 2516 2517 if (Debug) { 2518 SIMPLEQ_FOREACH(f, &Files, f_next) { 2519 for (i = 0; i <= LOG_NFACILITIES; i++) 2520 if (f->f_pmask[i] == INTERNAL_NOPRI) 2521 printf("X "); 2522 else 2523 printf("%d ", f->f_pmask[i]); 2524 printf("%s: ", TypeNames[f->f_type]); 2525 switch (f->f_type) { 2526 case F_FILE: 2527 case F_TTY: 2528 case F_CONSOLE: 2529 case F_PIPE: 2530 printf("%s", f->f_un.f_fname); 2531 break; 2532 2533 case F_FORWUDP: 2534 case F_FORWTCP: 2535 case F_FORWTLS: 2536 printf("%s", f->f_un.f_forw.f_loghost); 2537 break; 2538 2539 case F_USERS: 2540 for (i = 0; i < MAXUNAMES && 2541 *f->f_un.f_uname[i]; i++) 2542 printf("%s, ", f->f_un.f_uname[i]); 2543 break; 2544 2545 case F_MEMBUF: 2546 printf("%s", f->f_un.f_mb.f_mname); 2547 break; 2548 2549 } 2550 if (f->f_program || f->f_hostname) 2551 printf(" (%s, %s)", 2552 f->f_program ? f->f_program : "*", 2553 f->f_hostname ? f->f_hostname : "*"); 2554 printf("\n"); 2555 } 2556 } 2557 } 2558 2559 #define progmatches(p1, p2) \ 2560 (p1 == p2 || (p1 != NULL && p2 != NULL && strcmp(p1, p2) == 0)) 2561 2562 /* 2563 * Spot a line with a duplicate file, pipe, console, tty, or membuf target. 2564 */ 2565 struct filed * 2566 find_dup(struct filed *f) 2567 { 2568 struct filed *list; 2569 2570 SIMPLEQ_FOREACH(list, &Files, f_next) { 2571 if (list->f_quick || f->f_quick) 2572 continue; 2573 switch (list->f_type) { 2574 case F_FILE: 2575 case F_TTY: 2576 case F_CONSOLE: 2577 case F_PIPE: 2578 if (strcmp(list->f_un.f_fname, f->f_un.f_fname) == 0 && 2579 progmatches(list->f_program, f->f_program) && 2580 progmatches(list->f_hostname, f->f_hostname)) { 2581 log_debug("duplicate %s", f->f_un.f_fname); 2582 return (list); 2583 } 2584 break; 2585 case F_MEMBUF: 2586 if (strcmp(list->f_un.f_mb.f_mname, 2587 f->f_un.f_mb.f_mname) == 0 && 2588 progmatches(list->f_program, f->f_program) && 2589 progmatches(list->f_hostname, f->f_hostname)) { 2590 log_debug("duplicate membuf %s", 2591 f->f_un.f_mb.f_mname); 2592 return (list); 2593 } 2594 break; 2595 } 2596 } 2597 return (NULL); 2598 } 2599 2600 /* 2601 * Crack a configuration file line 2602 */ 2603 struct filed * 2604 cfline(char *line, char *progblock, char *hostblock) 2605 { 2606 int i, pri; 2607 size_t rb_len; 2608 char *bp, *p, *q, *proto, *host, *port, *ipproto; 2609 char buf[LOG_MAXLINE]; 2610 struct filed *xf, *f, *d; 2611 struct timeval to; 2612 2613 log_debug("cfline(\"%s\", f, \"%s\", \"%s\")", 2614 line, progblock, hostblock); 2615 2616 if ((f = calloc(1, sizeof(*f))) == NULL) 2617 fatal("allocate struct filed"); 2618 for (i = 0; i <= LOG_NFACILITIES; i++) 2619 f->f_pmask[i] = INTERNAL_NOPRI; 2620 2621 /* save program name if any */ 2622 f->f_quick = 0; 2623 if (*progblock == '!') { 2624 progblock++; 2625 f->f_quick = 1; 2626 } 2627 if (*hostblock == '+') { 2628 hostblock++; 2629 f->f_quick = 1; 2630 } 2631 if (strcmp(progblock, "*") != 0) 2632 f->f_program = strdup(progblock); 2633 if (strcmp(hostblock, "*") != 0) 2634 f->f_hostname = strdup(hostblock); 2635 2636 /* scan through the list of selectors */ 2637 for (p = line; *p && *p != '\t' && *p != ' ';) { 2638 2639 /* find the end of this facility name list */ 2640 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2641 continue; 2642 2643 /* collect priority name */ 2644 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2645 *bp++ = *q++; 2646 *bp = '\0'; 2647 2648 /* skip cruft */ 2649 while (*q && strchr(",;", *q)) 2650 q++; 2651 2652 /* decode priority name */ 2653 if (*buf == '*') 2654 pri = LOG_PRIMASK + 1; 2655 else { 2656 /* ignore trailing spaces */ 2657 for (i=strlen(buf)-1; i >= 0 && buf[i] == ' '; i--) { 2658 buf[i]='\0'; 2659 } 2660 2661 pri = decode(buf, prioritynames); 2662 if (pri < 0) { 2663 log_warnx("unknown priority name \"%s\"", buf); 2664 free(f); 2665 return (NULL); 2666 } 2667 } 2668 2669 /* scan facilities */ 2670 while (*p && !strchr("\t.; ", *p)) { 2671 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2672 *bp++ = *p++; 2673 *bp = '\0'; 2674 if (*buf == '*') 2675 for (i = 0; i < LOG_NFACILITIES; i++) 2676 f->f_pmask[i] = pri; 2677 else { 2678 i = decode(buf, facilitynames); 2679 if (i < 0) { 2680 log_warnx("unknown facility name " 2681 "\"%s\"", buf); 2682 free(f); 2683 return (NULL); 2684 } 2685 f->f_pmask[i >> 3] = pri; 2686 } 2687 while (*p == ',' || *p == ' ') 2688 p++; 2689 } 2690 2691 p = q; 2692 } 2693 2694 /* skip to action part */ 2695 while (*p == '\t' || *p == ' ') 2696 p++; 2697 2698 switch (*p) { 2699 case '@': 2700 if ((strlcpy(f->f_un.f_forw.f_loghost, p, 2701 sizeof(f->f_un.f_forw.f_loghost)) >= 2702 sizeof(f->f_un.f_forw.f_loghost))) { 2703 log_warnx("loghost too long \"%s\"", p); 2704 break; 2705 } 2706 if (loghost_parse(++p, &proto, &host, &port) == -1) { 2707 log_warnx("bad loghost \"%s\"", 2708 f->f_un.f_forw.f_loghost); 2709 break; 2710 } 2711 if (proto == NULL) 2712 proto = "udp"; 2713 if (strcmp(proto, "udp") == 0) { 2714 if (fd_udp == -1) 2715 proto = "udp6"; 2716 if (fd_udp6 == -1) 2717 proto = "udp4"; 2718 } 2719 ipproto = proto; 2720 if (strcmp(proto, "udp") == 0) { 2721 send_udp = send_udp6 = 1; 2722 } else if (strcmp(proto, "udp4") == 0) { 2723 send_udp = 1; 2724 if (fd_udp == -1) { 2725 log_warnx("no udp4 \"%s\"", 2726 f->f_un.f_forw.f_loghost); 2727 break; 2728 } 2729 } else if (strcmp(proto, "udp6") == 0) { 2730 send_udp6 = 1; 2731 if (fd_udp6 == -1) { 2732 log_warnx("no udp6 \"%s\"", 2733 f->f_un.f_forw.f_loghost); 2734 break; 2735 } 2736 } else if (strcmp(proto, "tcp") == 0 || 2737 strcmp(proto, "tcp4") == 0 || strcmp(proto, "tcp6") == 0) { 2738 ; 2739 } else if (strcmp(proto, "tls") == 0) { 2740 ipproto = "tcp"; 2741 } else if (strcmp(proto, "tls4") == 0) { 2742 ipproto = "tcp4"; 2743 } else if (strcmp(proto, "tls6") == 0) { 2744 ipproto = "tcp6"; 2745 } else { 2746 log_warnx("bad protocol \"%s\"", 2747 f->f_un.f_forw.f_loghost); 2748 break; 2749 } 2750 if (strlen(host) >= NI_MAXHOST) { 2751 log_warnx("host too long \"%s\"", 2752 f->f_un.f_forw.f_loghost); 2753 break; 2754 } 2755 if (port == NULL) 2756 port = strncmp(proto, "tls", 3) == 0 ? 2757 "syslog-tls" : "syslog"; 2758 if (strlen(port) >= NI_MAXSERV) { 2759 log_warnx("port too long \"%s\"", 2760 f->f_un.f_forw.f_loghost); 2761 break; 2762 } 2763 if (priv_getaddrinfo(ipproto, host, port, 2764 (struct sockaddr*)&f->f_un.f_forw.f_addr, 2765 sizeof(f->f_un.f_forw.f_addr)) != 0) { 2766 log_warnx("bad hostname \"%s\"", 2767 f->f_un.f_forw.f_loghost); 2768 break; 2769 } 2770 f->f_file = -1; 2771 if (strncmp(proto, "udp", 3) == 0) { 2772 switch (f->f_un.f_forw.f_addr.ss_family) { 2773 case AF_INET: 2774 f->f_file = fd_udp; 2775 break; 2776 case AF_INET6: 2777 f->f_file = fd_udp6; 2778 break; 2779 } 2780 f->f_type = F_FORWUDP; 2781 } else if (strncmp(ipproto, "tcp", 3) == 0) { 2782 if ((f->f_un.f_forw.f_bufev = bufferevent_new(-1, 2783 tcp_dropcb, tcp_writecb, tcp_errorcb, f)) == NULL) { 2784 log_warn("bufferevent \"%s\"", 2785 f->f_un.f_forw.f_loghost); 2786 break; 2787 } 2788 if (strncmp(proto, "tls", 3) == 0) { 2789 f->f_un.f_forw.f_host = strdup(host); 2790 f->f_type = F_FORWTLS; 2791 } else { 2792 f->f_type = F_FORWTCP; 2793 } 2794 /* 2795 * If we try to connect to a TLS server immediately 2796 * syslogd gets an SIGPIPE as the signal handlers have 2797 * not been set up. Delay the connection until the 2798 * event loop is started. We can reuse the write event 2799 * for that as bufferevent is still disabled. 2800 */ 2801 to.tv_sec = 0; 2802 to.tv_usec = 1; 2803 evtimer_set(&f->f_un.f_forw.f_bufev->ev_write, 2804 tcp_connectcb, f); 2805 evtimer_add(&f->f_un.f_forw.f_bufev->ev_write, &to); 2806 } 2807 break; 2808 2809 case '/': 2810 case '|': 2811 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2812 d = find_dup(f); 2813 if (d != NULL) { 2814 for (i = 0; i <= LOG_NFACILITIES; i++) 2815 if (f->f_pmask[i] != INTERNAL_NOPRI) 2816 d->f_pmask[i] = f->f_pmask[i]; 2817 free(f); 2818 return (NULL); 2819 } 2820 if (strcmp(p, ctty) == 0) { 2821 f->f_file = priv_open_tty(p); 2822 if (f->f_file < 0) 2823 log_warn("priv_open_tty \"%s\"", p); 2824 } else { 2825 f->f_file = priv_open_log(p); 2826 if (f->f_file < 0) 2827 log_warn("priv_open_log \"%s\"", p); 2828 } 2829 if (f->f_file < 0) { 2830 f->f_type = F_UNUSED; 2831 break; 2832 } 2833 if (isatty(f->f_file)) { 2834 if (strcmp(p, ctty) == 0) 2835 f->f_type = F_CONSOLE; 2836 else 2837 f->f_type = F_TTY; 2838 } else { 2839 if (*p == '|') 2840 f->f_type = F_PIPE; 2841 else { 2842 f->f_type = F_FILE; 2843 2844 /* Clear O_NONBLOCK flag on f->f_file */ 2845 if ((i = fcntl(f->f_file, F_GETFL)) != -1) { 2846 i &= ~O_NONBLOCK; 2847 fcntl(f->f_file, F_SETFL, i); 2848 } 2849 } 2850 } 2851 break; 2852 2853 case '*': 2854 f->f_type = F_WALL; 2855 break; 2856 2857 case ':': 2858 f->f_type = F_MEMBUF; 2859 2860 /* Parse buffer size (in kb) */ 2861 errno = 0; 2862 rb_len = strtoul(++p, &q, 0); 2863 if (*p == '\0' || (errno == ERANGE && rb_len == ULONG_MAX) || 2864 *q != ':' || rb_len == 0) { 2865 f->f_type = F_UNUSED; 2866 log_warnx("strtoul \"%s\"", p); 2867 break; 2868 } 2869 q++; 2870 rb_len *= 1024; 2871 2872 /* Copy buffer name */ 2873 for(i = 0; (size_t)i < sizeof(f->f_un.f_mb.f_mname) - 1; i++) { 2874 if (!isalnum((unsigned char)q[i])) 2875 break; 2876 f->f_un.f_mb.f_mname[i] = q[i]; 2877 } 2878 2879 /* Make sure buffer name is unique */ 2880 xf = find_dup(f); 2881 2882 /* Error on missing or non-unique name, or bad buffer length */ 2883 if (i == 0 || rb_len > MAX_MEMBUF || xf != NULL) { 2884 f->f_type = F_UNUSED; 2885 log_warnx("find_dup \"%s\"", p); 2886 break; 2887 } 2888 2889 /* Set buffer length */ 2890 rb_len = MAXIMUM(rb_len, MIN_MEMBUF); 2891 f->f_un.f_mb.f_len = rb_len; 2892 f->f_un.f_mb.f_overflow = 0; 2893 f->f_un.f_mb.f_attached = 0; 2894 break; 2895 2896 default: 2897 for (i = 0; i < MAXUNAMES && *p; i++) { 2898 for (q = p; *q && *q != ','; ) 2899 q++; 2900 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 2901 if ((q - p) > UT_NAMESIZE) 2902 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 2903 else 2904 f->f_un.f_uname[i][q - p] = '\0'; 2905 while (*q == ',' || *q == ' ') 2906 q++; 2907 p = q; 2908 } 2909 f->f_type = F_USERS; 2910 break; 2911 } 2912 return (f); 2913 } 2914 2915 /* 2916 * Parse the host and port parts from a loghost string. 2917 */ 2918 int 2919 loghost_parse(char *str, char **proto, char **host, char **port) 2920 { 2921 char *prefix = NULL; 2922 2923 if ((*host = strchr(str, ':')) && 2924 (*host)[1] == '/' && (*host)[2] == '/') { 2925 prefix = str; 2926 **host = '\0'; 2927 str = *host + 3; 2928 } 2929 if (proto) 2930 *proto = prefix; 2931 else if (prefix) 2932 return (-1); 2933 2934 *host = str; 2935 if (**host == '[') { 2936 (*host)++; 2937 str = strchr(*host, ']'); 2938 if (str == NULL) 2939 return (-1); 2940 *str++ = '\0'; 2941 } 2942 *port = strrchr(str, ':'); 2943 if (*port != NULL) 2944 *(*port)++ = '\0'; 2945 2946 return (0); 2947 } 2948 2949 /* 2950 * Retrieve the size of the kernel message buffer, via sysctl. 2951 */ 2952 int 2953 getmsgbufsize(void) 2954 { 2955 int msgbufsize, mib[2]; 2956 size_t size; 2957 2958 mib[0] = CTL_KERN; 2959 mib[1] = KERN_MSGBUFSIZE; 2960 size = sizeof msgbufsize; 2961 if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) { 2962 log_debug("couldn't get kern.msgbufsize"); 2963 return (0); 2964 } 2965 return (msgbufsize); 2966 } 2967 2968 /* 2969 * Decode a symbolic name to a numeric value 2970 */ 2971 int 2972 decode(const char *name, const CODE *codetab) 2973 { 2974 const CODE *c; 2975 char *p, buf[40]; 2976 2977 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2978 if (isupper((unsigned char)*name)) 2979 *p = tolower((unsigned char)*name); 2980 else 2981 *p = *name; 2982 } 2983 *p = '\0'; 2984 for (c = codetab; c->c_name; c++) 2985 if (!strcmp(buf, c->c_name)) 2986 return (c->c_val); 2987 2988 return (-1); 2989 } 2990 2991 void 2992 markit(void) 2993 { 2994 struct filed *f; 2995 2996 (void)gettimeofday(&now, NULL); 2997 MarkSeq += TIMERINTVL; 2998 if (MarkSeq >= MarkInterval) { 2999 logline(LOG_INFO, ADDDATE|MARK, LocalHostName, "-- MARK --"); 3000 MarkSeq = 0; 3001 } 3002 3003 SIMPLEQ_FOREACH(f, &Files, f_next) { 3004 if (f->f_prevcount && now.tv_sec >= REPEATTIME(f)) { 3005 log_debug("flush %s: repeated %d times, %d sec", 3006 TypeNames[f->f_type], f->f_prevcount, 3007 repeatinterval[f->f_repeatcount]); 3008 fprintlog(f, 0, (char *)NULL); 3009 BACKOFF(f); 3010 } 3011 } 3012 } 3013 3014 int 3015 unix_socket(char *path, int type, mode_t mode) 3016 { 3017 struct sockaddr_un s_un; 3018 int fd, optval; 3019 mode_t old_umask; 3020 3021 memset(&s_un, 0, sizeof(s_un)); 3022 s_un.sun_family = AF_UNIX; 3023 if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >= 3024 sizeof(s_un.sun_path)) { 3025 log_warnx("socket path too long \"%s\"", path); 3026 return (-1); 3027 } 3028 3029 if ((fd = socket(AF_UNIX, type, 0)) == -1) { 3030 log_warn("socket unix \"%s\"", path); 3031 return (-1); 3032 } 3033 3034 if (Debug) { 3035 if (connect(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == 0 || 3036 errno == EPROTOTYPE) { 3037 close(fd); 3038 errno = EISCONN; 3039 log_warn("connect unix \"%s\"", path); 3040 return (-1); 3041 } 3042 } 3043 3044 old_umask = umask(0177); 3045 3046 unlink(path); 3047 if (bind(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) { 3048 log_warn("bind unix \"%s\"", path); 3049 umask(old_umask); 3050 close(fd); 3051 return (-1); 3052 } 3053 3054 umask(old_umask); 3055 3056 if (chmod(path, mode) == -1) { 3057 log_warn("chmod unix \"%s\"", path); 3058 close(fd); 3059 unlink(path); 3060 return (-1); 3061 } 3062 3063 optval = LOG_MAXLINE + PATH_MAX; 3064 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &optval, sizeof(optval)) 3065 == -1) 3066 log_warn("setsockopt unix \"%s\"", path); 3067 3068 return (fd); 3069 } 3070 3071 /* 3072 * Increase socket buffer size in small steps to get partial success 3073 * if we hit a kernel limit. Allow an optional final step. 3074 */ 3075 void 3076 double_sockbuf(int fd, int optname, int bigsize) 3077 { 3078 socklen_t len; 3079 int i, newsize, oldsize = 0; 3080 3081 len = sizeof(oldsize); 3082 if (getsockopt(fd, SOL_SOCKET, optname, &oldsize, &len) == -1) 3083 log_warn("getsockopt bufsize"); 3084 len = sizeof(newsize); 3085 newsize = LOG_MAXLINE + 128; /* data + control */ 3086 /* allow 8 full length messages, that is 66560 bytes */ 3087 for (i = 0; i < 4; i++, newsize *= 2) { 3088 if (newsize <= oldsize) 3089 continue; 3090 if (setsockopt(fd, SOL_SOCKET, optname, &newsize, len) == -1) 3091 log_warn("setsockopt bufsize %d", newsize); 3092 else 3093 oldsize = newsize; 3094 } 3095 if (bigsize && bigsize > oldsize) { 3096 if (setsockopt(fd, SOL_SOCKET, optname, &bigsize, len) == -1) 3097 log_warn("setsockopt bufsize %d", bigsize); 3098 } 3099 } 3100 3101 void 3102 set_sockbuf(int fd) 3103 { 3104 int size = 65536; 3105 3106 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) == -1) 3107 log_warn("setsockopt sndbufsize %d", size); 3108 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)) == -1) 3109 log_warn("setsockopt rcvbufsize %d", size); 3110 } 3111 3112 void 3113 set_keepalive(int fd) 3114 { 3115 int val = 1; 3116 3117 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val)) == -1) 3118 log_warn("setsockopt keepalive %d", val); 3119 } 3120 3121 void 3122 ctlconn_cleanup(void) 3123 { 3124 struct filed *f; 3125 3126 close(fd_ctlconn); 3127 fd_ctlconn = -1; 3128 event_del(ev_ctlread); 3129 event_del(ev_ctlwrite); 3130 event_add(ev_ctlaccept, NULL); 3131 3132 if (ctl_state == CTL_WRITING_CONT_REPLY) 3133 SIMPLEQ_FOREACH(f, &Files, f_next) 3134 if (f->f_type == F_MEMBUF) 3135 f->f_un.f_mb.f_attached = 0; 3136 3137 ctl_state = ctl_cmd_bytes = ctl_reply_offset = ctl_reply_size = 0; 3138 } 3139 3140 void 3141 ctlsock_acceptcb(int fd, short event, void *arg) 3142 { 3143 struct event *ev = arg; 3144 3145 if ((fd = reserve_accept4(fd, event, ev, ctlsock_acceptcb, 3146 NULL, NULL, SOCK_NONBLOCK)) == -1) { 3147 if (errno != ENFILE && errno != EMFILE && 3148 errno != EINTR && errno != EWOULDBLOCK && 3149 errno != ECONNABORTED) 3150 log_warn("accept control socket"); 3151 return; 3152 } 3153 log_debug("Accepting control connection"); 3154 3155 if (fd_ctlconn != -1) 3156 ctlconn_cleanup(); 3157 3158 /* Only one connection at a time */ 3159 event_del(ev); 3160 3161 fd_ctlconn = fd; 3162 /* file descriptor has changed, reset event */ 3163 event_set(ev_ctlread, fd_ctlconn, EV_READ|EV_PERSIST, 3164 ctlconn_readcb, ev_ctlread); 3165 event_set(ev_ctlwrite, fd_ctlconn, EV_WRITE|EV_PERSIST, 3166 ctlconn_writecb, ev_ctlwrite); 3167 event_add(ev_ctlread, NULL); 3168 ctl_state = CTL_READING_CMD; 3169 ctl_cmd_bytes = 0; 3170 } 3171 3172 static struct filed 3173 *find_membuf_log(const char *name) 3174 { 3175 struct filed *f; 3176 3177 SIMPLEQ_FOREACH(f, &Files, f_next) { 3178 if (f->f_type == F_MEMBUF && 3179 strcmp(f->f_un.f_mb.f_mname, name) == 0) 3180 break; 3181 } 3182 return (f); 3183 } 3184 3185 void 3186 ctlconn_readcb(int fd, short event, void *arg) 3187 { 3188 struct filed *f; 3189 struct ctl_reply_hdr *reply_hdr = (struct ctl_reply_hdr *)ctl_reply; 3190 ssize_t n; 3191 u_int32_t flags = 0; 3192 3193 if (ctl_state == CTL_WRITING_REPLY || 3194 ctl_state == CTL_WRITING_CONT_REPLY) { 3195 /* client has closed the connection */ 3196 ctlconn_cleanup(); 3197 return; 3198 } 3199 3200 retry: 3201 n = read(fd, (char*)&ctl_cmd + ctl_cmd_bytes, 3202 sizeof(ctl_cmd) - ctl_cmd_bytes); 3203 switch (n) { 3204 case -1: 3205 if (errno == EINTR) 3206 goto retry; 3207 if (errno == EWOULDBLOCK) 3208 return; 3209 log_warn("read control socket"); 3210 /* FALLTHROUGH */ 3211 case 0: 3212 ctlconn_cleanup(); 3213 return; 3214 default: 3215 ctl_cmd_bytes += n; 3216 } 3217 if (ctl_cmd_bytes < sizeof(ctl_cmd)) 3218 return; 3219 3220 if (ntohl(ctl_cmd.version) != CTL_VERSION) { 3221 log_warnx("unknown client protocol version"); 3222 ctlconn_cleanup(); 3223 return; 3224 } 3225 3226 /* Ensure that logname is \0 terminated */ 3227 if (memchr(ctl_cmd.logname, '\0', sizeof(ctl_cmd.logname)) == NULL) { 3228 log_warnx("corrupt control socket command"); 3229 ctlconn_cleanup(); 3230 return; 3231 } 3232 3233 *reply_text = '\0'; 3234 3235 ctl_reply_size = ctl_reply_offset = 0; 3236 memset(reply_hdr, '\0', sizeof(*reply_hdr)); 3237 3238 ctl_cmd.cmd = ntohl(ctl_cmd.cmd); 3239 log_debug("ctlcmd %x logname \"%s\"", ctl_cmd.cmd, ctl_cmd.logname); 3240 3241 switch (ctl_cmd.cmd) { 3242 case CMD_READ: 3243 case CMD_READ_CLEAR: 3244 case CMD_READ_CONT: 3245 case CMD_FLAGS: 3246 f = find_membuf_log(ctl_cmd.logname); 3247 if (f == NULL) { 3248 strlcpy(reply_text, "No such log\n", MAX_MEMBUF); 3249 } else { 3250 if (ctl_cmd.cmd != CMD_FLAGS) { 3251 ringbuf_to_string(reply_text, MAX_MEMBUF, 3252 f->f_un.f_mb.f_rb); 3253 } 3254 if (f->f_un.f_mb.f_overflow) 3255 flags |= CTL_HDR_FLAG_OVERFLOW; 3256 if (ctl_cmd.cmd == CMD_READ_CLEAR) { 3257 ringbuf_clear(f->f_un.f_mb.f_rb); 3258 f->f_un.f_mb.f_overflow = 0; 3259 } 3260 if (ctl_cmd.cmd == CMD_READ_CONT) { 3261 f->f_un.f_mb.f_attached = 1; 3262 tailify_replytext(reply_text, 3263 ctl_cmd.lines > 0 ? ctl_cmd.lines : 10); 3264 } else if (ctl_cmd.lines > 0) { 3265 tailify_replytext(reply_text, ctl_cmd.lines); 3266 } 3267 } 3268 break; 3269 case CMD_CLEAR: 3270 f = find_membuf_log(ctl_cmd.logname); 3271 if (f == NULL) { 3272 strlcpy(reply_text, "No such log\n", MAX_MEMBUF); 3273 } else { 3274 ringbuf_clear(f->f_un.f_mb.f_rb); 3275 if (f->f_un.f_mb.f_overflow) 3276 flags |= CTL_HDR_FLAG_OVERFLOW; 3277 f->f_un.f_mb.f_overflow = 0; 3278 strlcpy(reply_text, "Log cleared\n", MAX_MEMBUF); 3279 } 3280 break; 3281 case CMD_LIST: 3282 SIMPLEQ_FOREACH(f, &Files, f_next) { 3283 if (f->f_type == F_MEMBUF) { 3284 strlcat(reply_text, f->f_un.f_mb.f_mname, 3285 MAX_MEMBUF); 3286 if (f->f_un.f_mb.f_overflow) { 3287 strlcat(reply_text, "*", MAX_MEMBUF); 3288 flags |= CTL_HDR_FLAG_OVERFLOW; 3289 } 3290 strlcat(reply_text, " ", MAX_MEMBUF); 3291 } 3292 } 3293 strlcat(reply_text, "\n", MAX_MEMBUF); 3294 break; 3295 default: 3296 log_warnx("unsupported control socket command"); 3297 ctlconn_cleanup(); 3298 return; 3299 } 3300 reply_hdr->version = htonl(CTL_VERSION); 3301 reply_hdr->flags = htonl(flags); 3302 3303 ctl_reply_size = CTL_REPLY_SIZE; 3304 log_debug("ctlcmd reply length %lu", (u_long)ctl_reply_size); 3305 3306 /* Otherwise, set up to write out reply */ 3307 ctl_state = (ctl_cmd.cmd == CMD_READ_CONT) ? 3308 CTL_WRITING_CONT_REPLY : CTL_WRITING_REPLY; 3309 3310 event_add(ev_ctlwrite, NULL); 3311 3312 /* another syslogc can kick us out */ 3313 if (ctl_state == CTL_WRITING_CONT_REPLY) 3314 event_add(ev_ctlaccept, NULL); 3315 } 3316 3317 void 3318 ctlconn_writecb(int fd, short event, void *arg) 3319 { 3320 struct event *ev = arg; 3321 ssize_t n; 3322 3323 if (!(ctl_state == CTL_WRITING_REPLY || 3324 ctl_state == CTL_WRITING_CONT_REPLY)) { 3325 /* Shouldn't be here! */ 3326 log_warnx("control socket write with bad state"); 3327 ctlconn_cleanup(); 3328 return; 3329 } 3330 3331 retry: 3332 n = write(fd, ctl_reply + ctl_reply_offset, 3333 ctl_reply_size - ctl_reply_offset); 3334 switch (n) { 3335 case -1: 3336 if (errno == EINTR) 3337 goto retry; 3338 if (errno == EWOULDBLOCK) 3339 return; 3340 if (errno != EPIPE) 3341 log_warn("write control socket"); 3342 /* FALLTHROUGH */ 3343 case 0: 3344 ctlconn_cleanup(); 3345 return; 3346 default: 3347 ctl_reply_offset += n; 3348 } 3349 if (ctl_reply_offset < ctl_reply_size) 3350 return; 3351 3352 if (ctl_state != CTL_WRITING_CONT_REPLY) { 3353 ctlconn_cleanup(); 3354 return; 3355 } 3356 3357 /* 3358 * Make space in the buffer for continous writes. 3359 * Set offset behind reply header to skip it 3360 */ 3361 *reply_text = '\0'; 3362 ctl_reply_offset = ctl_reply_size = CTL_REPLY_SIZE; 3363 3364 /* Now is a good time to report dropped lines */ 3365 if (membuf_drop) { 3366 strlcat(reply_text, "<ENOBUFS>\n", MAX_MEMBUF); 3367 ctl_reply_size = CTL_REPLY_SIZE; 3368 membuf_drop = 0; 3369 } else { 3370 /* Nothing left to write */ 3371 event_del(ev); 3372 } 3373 } 3374 3375 /* Shorten replytext to number of lines */ 3376 void 3377 tailify_replytext(char *replytext, int lines) 3378 { 3379 char *start, *nl; 3380 int count = 0; 3381 start = nl = replytext; 3382 3383 while ((nl = strchr(nl, '\n')) != NULL) { 3384 nl++; 3385 if (++count > lines) { 3386 start = strchr(start, '\n'); 3387 start++; 3388 } 3389 } 3390 if (start != replytext) { 3391 int len = strlen(start); 3392 memmove(replytext, start, len); 3393 *(replytext + len) = '\0'; 3394 } 3395 } 3396 3397 void 3398 ctlconn_logto(char *line) 3399 { 3400 size_t l; 3401 3402 if (membuf_drop) 3403 return; 3404 3405 l = strlen(line); 3406 if (l + 2 > (CTL_REPLY_MAXSIZE - ctl_reply_size)) { 3407 /* remember line drops for later report */ 3408 membuf_drop = 1; 3409 return; 3410 } 3411 memcpy(ctl_reply + ctl_reply_size, line, l); 3412 memcpy(ctl_reply + ctl_reply_size + l, "\n", 2); 3413 ctl_reply_size += l + 1; 3414 event_add(ev_ctlwrite, NULL); 3415 } 3416