1 /* $OpenBSD: syslogd.c,v 1.259 2019/01/18 15:44:14 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 nunix; /* Number of Unix domain sockets requested */ 219 char **path_unix; /* Paths to Unix domain sockets */ 220 int Debug; /* debug flag */ 221 int Foreground; /* run in foreground, instead of daemonizing */ 222 char LocalHostName[HOST_NAME_MAX+1]; /* our hostname */ 223 char *LocalDomain; /* our local domain name */ 224 int Started = 0; /* set after privsep */ 225 int Initialized = 0; /* set when we have initialized ourselves */ 226 227 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 228 int MarkSeq = 0; /* mark sequence number */ 229 int PrivChild = 0; /* Exec the privileged parent process */ 230 int Repeat = 0; /* 0 msg repeated, 1 in files only, 2 never */ 231 int SecureMode = 1; /* when true, speak only unix domain socks */ 232 int NoDNS = 0; /* when true, refrain from doing DNS lookups */ 233 int ZuluTime = 0; /* display date and time in UTC ISO format */ 234 int IncludeHostname = 0; /* include RFC 3164 hostnames when forwarding */ 235 int Family = PF_UNSPEC; /* protocol family, may disable IPv4 or IPv6 */ 236 char *path_ctlsock = NULL; /* Path to control socket */ 237 238 struct tls *server_ctx; 239 struct tls_config *client_config, *server_config; 240 const char *CAfile = "/etc/ssl/cert.pem"; /* file containing CA certificates */ 241 int NoVerify = 0; /* do not verify TLS server x509 certificate */ 242 const char *ClientCertfile = NULL; 243 const char *ClientKeyfile = NULL; 244 const char *ServerCAfile = NULL; 245 int tcpbuf_dropped = 0; /* count messages dropped from TCP or TLS */ 246 int file_dropped = 0; /* messages dropped due to file system full */ 247 int init_dropped = 0; /* messages dropped during initialization */ 248 249 #define CTL_READING_CMD 1 250 #define CTL_WRITING_REPLY 2 251 #define CTL_WRITING_CONT_REPLY 3 252 int ctl_state = 0; /* What the control socket is up to */ 253 int membuf_drop = 0; /* logs dropped in continuous membuf read */ 254 255 /* 256 * Client protocol NB. all numeric fields in network byte order 257 */ 258 #define CTL_VERSION 2 259 260 /* Request */ 261 struct { 262 u_int32_t version; 263 #define CMD_READ 1 /* Read out log */ 264 #define CMD_READ_CLEAR 2 /* Read and clear log */ 265 #define CMD_CLEAR 3 /* Clear log */ 266 #define CMD_LIST 4 /* List available logs */ 267 #define CMD_FLAGS 5 /* Query flags only */ 268 #define CMD_READ_CONT 6 /* Read out log continuously */ 269 u_int32_t cmd; 270 u_int32_t lines; 271 char logname[MAX_MEMBUF_NAME]; 272 } ctl_cmd; 273 274 size_t ctl_cmd_bytes = 0; /* number of bytes of ctl_cmd read */ 275 276 /* Reply */ 277 struct ctl_reply_hdr { 278 u_int32_t version; 279 #define CTL_HDR_FLAG_OVERFLOW 0x01 280 u_int32_t flags; 281 /* Reply text follows, up to MAX_MEMBUF long */ 282 }; 283 284 #define CTL_HDR_LEN (sizeof(struct ctl_reply_hdr)) 285 #define CTL_REPLY_MAXSIZE (CTL_HDR_LEN + MAX_MEMBUF) 286 #define CTL_REPLY_SIZE (strlen(reply_text) + CTL_HDR_LEN) 287 288 char *ctl_reply = NULL; /* Buffer for control connection reply */ 289 char *reply_text; /* Start of reply text in buffer */ 290 size_t ctl_reply_size = 0; /* Number of bytes used in reply */ 291 size_t ctl_reply_offset = 0; /* Number of bytes of reply written so far */ 292 293 char *linebuf; 294 int linesize; 295 296 int fd_ctlconn, fd_udp, fd_udp6, send_udp, send_udp6; 297 struct event *ev_ctlaccept, *ev_ctlread, *ev_ctlwrite; 298 299 struct peer { 300 struct buffertls p_buftls; 301 struct bufferevent *p_bufev; 302 struct tls *p_ctx; 303 char *p_peername; 304 char *p_hostname; 305 int p_fd; 306 }; 307 char hostname_unknown[] = "???"; 308 309 void klog_readcb(int, short, void *); 310 void udp_readcb(int, short, void *); 311 void unix_readcb(int, short, void *); 312 int reserve_accept4(int, int, struct event *, 313 void (*)(int, short, void *), struct sockaddr *, socklen_t *, int); 314 void tcp_acceptcb(int, short, void *); 315 void tls_acceptcb(int, short, void *); 316 void acceptcb(int, short, void *, int); 317 int octet_counting(struct evbuffer *, char **, int); 318 int non_transparent_framing(struct evbuffer *, char **); 319 void tcp_readcb(struct bufferevent *, void *); 320 void tcp_closecb(struct bufferevent *, short, void *); 321 int tcp_socket(struct filed *); 322 void tcp_dropcb(struct bufferevent *, void *); 323 void tcp_writecb(struct bufferevent *, void *); 324 void tcp_errorcb(struct bufferevent *, short, void *); 325 void tcp_connectcb(int, short, void *); 326 void tcp_connect_retry(struct bufferevent *, struct filed *); 327 int tcpbuf_countmsg(struct bufferevent *bufev); 328 void die_signalcb(int, short, void *); 329 void mark_timercb(int, short, void *); 330 void init_signalcb(int, short, void *); 331 void ctlsock_acceptcb(int, short, void *); 332 void ctlconn_readcb(int, short, void *); 333 void ctlconn_writecb(int, short, void *); 334 void ctlconn_logto(char *); 335 void ctlconn_cleanup(void); 336 337 struct filed *cfline(char *, char *, char *); 338 void cvthname(struct sockaddr *, char *, size_t); 339 int decode(const char *, const CODE *); 340 void markit(void); 341 void fprintlog(struct filed *, int, char *); 342 void dropped_warn(int *, const char *); 343 void init(void); 344 void logevent(int, const char *); 345 void logline(int, int, char *, char *); 346 struct filed *find_dup(struct filed *); 347 size_t parsepriority(const char *, int *); 348 void printline(char *, char *); 349 void printsys(char *); 350 void usage(void); 351 void wallmsg(struct filed *, struct iovec *); 352 int loghost_parse(char *, char **, char **, char **); 353 int getmsgbufsize(void); 354 void address_alloc(const char *, const char *, char ***, char ***, int *); 355 int socket_bind(const char *, const char *, const char *, int, 356 int *, int *); 357 int unix_socket(char *, int, mode_t); 358 void double_sockbuf(int, int, int); 359 void set_sockbuf(int); 360 void tailify_replytext(char *, int); 361 362 int 363 main(int argc, char *argv[]) 364 { 365 struct timeval to; 366 struct event *ev_klog, *ev_sendsys, *ev_udp, *ev_udp6, 367 *ev_bind, *ev_listen, *ev_tls, *ev_unix, 368 *ev_hup, *ev_int, *ev_quit, *ev_term, *ev_mark; 369 sigset_t sigmask; 370 const char *errstr; 371 char *p; 372 int ch, i; 373 int lockpipe[2] = { -1, -1}, pair[2], nullfd, fd; 374 int fd_ctlsock, fd_klog, fd_sendsys, *fd_bind, *fd_listen; 375 int *fd_tls, *fd_unix, nbind, nlisten, ntls; 376 char **bind_host, **bind_port, **listen_host, **listen_port; 377 char *tls_hostport, **tls_host, **tls_port; 378 379 /* block signal until handler is set up */ 380 sigemptyset(&sigmask); 381 sigaddset(&sigmask, SIGHUP); 382 if (sigprocmask(SIG_SETMASK, &sigmask, NULL) == -1) 383 err(1, "sigprocmask block"); 384 385 if ((path_unix = malloc(sizeof(*path_unix))) == NULL) 386 err(1, "malloc %s", _PATH_LOG); 387 path_unix[0] = _PATH_LOG; 388 nunix = 1; 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 } else { 858 /* 859 * If generic UDP file descriptors are used neither 860 * for receiving nor for sending, close them. Then 861 * there is no useless *.514 in netstat. 862 */ 863 if (fd_udp != -1 && !send_udp) { 864 close(fd_udp); 865 fd_udp = -1; 866 } 867 if (fd_udp6 != -1 && !send_udp6) { 868 close(fd_udp6); 869 fd_udp6 = -1; 870 } 871 } 872 for (i = 0; i < nbind; i++) 873 if (fd_bind[i] != -1) 874 event_add(&ev_bind[i], NULL); 875 for (i = 0; i < nlisten; i++) 876 if (fd_listen[i] != -1) 877 event_add(&ev_listen[i], NULL); 878 for (i = 0; i < ntls; i++) 879 if (fd_tls[i] != -1) 880 event_add(&ev_tls[i], NULL); 881 for (i = 0; i < nunix; i++) 882 if (fd_unix[i] != -1) 883 event_add(&ev_unix[i], NULL); 884 885 signal_add(ev_hup, NULL); 886 signal_add(ev_term, NULL); 887 if (Debug || Foreground) { 888 signal_add(ev_int, NULL); 889 signal_add(ev_quit, NULL); 890 } else { 891 (void)signal(SIGINT, SIG_IGN); 892 (void)signal(SIGQUIT, SIG_IGN); 893 } 894 (void)signal(SIGCHLD, SIG_IGN); 895 (void)signal(SIGPIPE, SIG_IGN); 896 897 to.tv_sec = TIMERINTVL; 898 to.tv_usec = 0; 899 evtimer_add(ev_mark, &to); 900 901 log_info(LOG_INFO, "start"); 902 log_debug("syslogd: started"); 903 904 sigemptyset(&sigmask); 905 if (sigprocmask(SIG_SETMASK, &sigmask, NULL) == -1) 906 err(1, "sigprocmask unblock"); 907 908 event_dispatch(); 909 /* NOTREACHED */ 910 return (0); 911 } 912 913 void 914 address_alloc(const char *name, const char *address, char ***host, 915 char ***port, int *num) 916 { 917 char *p; 918 919 /* do not care about memory leak, argv has to be preserved */ 920 if ((p = strdup(address)) == NULL) 921 err(1, "%s address %s", name, address); 922 if ((*host = reallocarray(*host, *num + 1, sizeof(**host))) == NULL) 923 err(1, "%s host %s", name, address); 924 if ((*port = reallocarray(*port, *num + 1, sizeof(**port))) == NULL) 925 err(1, "%s port %s", name, address); 926 if (loghost_parse(p, NULL, *host + *num, *port + *num) == -1) 927 errx(1, "bad %s address: %s", name, address); 928 (*num)++; 929 } 930 931 int 932 socket_bind(const char *proto, const char *host, const char *port, 933 int shutread, int *fd, int *fd6) 934 { 935 struct addrinfo hints, *res, *res0; 936 char hostname[NI_MAXHOST], servname[NI_MAXSERV]; 937 int *fdp, error, reuseaddr; 938 939 *fd = *fd6 = -1; 940 if (proto == NULL) 941 proto = "udp"; 942 if (port == NULL) 943 port = strcmp(proto, "tls") == 0 ? "syslog-tls" : "syslog"; 944 945 memset(&hints, 0, sizeof(hints)); 946 hints.ai_family = Family; 947 if (strcmp(proto, "udp") == 0) { 948 hints.ai_socktype = SOCK_DGRAM; 949 hints.ai_protocol = IPPROTO_UDP; 950 } else { 951 hints.ai_socktype = SOCK_STREAM; 952 hints.ai_protocol = IPPROTO_TCP; 953 } 954 hints.ai_flags = AI_PASSIVE; 955 956 if ((error = getaddrinfo(host, port, &hints, &res0))) { 957 log_warnx("getaddrinfo proto %s, host %s, port %s: %s", 958 proto, host ? host : "*", port, gai_strerror(error)); 959 return (-1); 960 } 961 962 for (res = res0; res; res = res->ai_next) { 963 switch (res->ai_family) { 964 case AF_INET: 965 fdp = fd; 966 break; 967 case AF_INET6: 968 fdp = fd6; 969 break; 970 default: 971 continue; 972 } 973 if (*fdp >= 0) 974 continue; 975 976 if ((*fdp = socket(res->ai_family, 977 res->ai_socktype | SOCK_NONBLOCK, res->ai_protocol)) == -1) 978 continue; 979 980 if (getnameinfo(res->ai_addr, res->ai_addrlen, hostname, 981 sizeof(hostname), servname, sizeof(servname), 982 NI_NUMERICHOST | NI_NUMERICSERV | 983 (res->ai_socktype == SOCK_DGRAM ? NI_DGRAM : 0)) != 0) { 984 log_debug("Malformed bind address"); 985 hostname[0] = servname[0] = '\0'; 986 } 987 if (shutread && shutdown(*fdp, SHUT_RD) == -1) { 988 log_warn("shutdown SHUT_RD " 989 "protocol %d, address %s, portnum %s", 990 res->ai_protocol, hostname, servname); 991 close(*fdp); 992 *fdp = -1; 993 continue; 994 } 995 if (!shutread && res->ai_protocol == IPPROTO_UDP) 996 double_sockbuf(*fdp, SO_RCVBUF, 0); 997 else if (res->ai_protocol == IPPROTO_TCP) 998 set_sockbuf(*fdp); 999 reuseaddr = 1; 1000 if (setsockopt(*fdp, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, 1001 sizeof(reuseaddr)) == -1) { 1002 log_warn("setsockopt SO_REUSEADDR " 1003 "protocol %d, address %s, portnum %s", 1004 res->ai_protocol, hostname, servname); 1005 close(*fdp); 1006 *fdp = -1; 1007 continue; 1008 } 1009 if (bind(*fdp, res->ai_addr, res->ai_addrlen) == -1) { 1010 log_warn("bind protocol %d, address %s, portnum %s", 1011 res->ai_protocol, hostname, servname); 1012 close(*fdp); 1013 *fdp = -1; 1014 continue; 1015 } 1016 if (!shutread && res->ai_protocol == IPPROTO_TCP && 1017 listen(*fdp, 10) == -1) { 1018 log_warn("listen protocol %d, address %s, portnum %s", 1019 res->ai_protocol, hostname, servname); 1020 close(*fdp); 1021 *fdp = -1; 1022 continue; 1023 } 1024 } 1025 1026 freeaddrinfo(res0); 1027 1028 if (*fd == -1 && *fd6 == -1) 1029 return (-1); 1030 return (0); 1031 } 1032 1033 void 1034 klog_readcb(int fd, short event, void *arg) 1035 { 1036 struct event *ev = arg; 1037 ssize_t n; 1038 1039 n = read(fd, linebuf, linesize - 1); 1040 if (n > 0) { 1041 linebuf[n] = '\0'; 1042 printsys(linebuf); 1043 } else if (n < 0 && errno != EINTR) { 1044 log_warn("read klog"); 1045 event_del(ev); 1046 } 1047 } 1048 1049 void 1050 udp_readcb(int fd, short event, void *arg) 1051 { 1052 struct sockaddr_storage sa; 1053 socklen_t salen; 1054 ssize_t n; 1055 1056 salen = sizeof(sa); 1057 n = recvfrom(fd, linebuf, LOG_MAXLINE, 0, (struct sockaddr *)&sa, 1058 &salen); 1059 if (n > 0) { 1060 char resolve[NI_MAXHOST]; 1061 1062 linebuf[n] = '\0'; 1063 cvthname((struct sockaddr *)&sa, resolve, sizeof(resolve)); 1064 log_debug("cvthname res: %s", resolve); 1065 printline(resolve, linebuf); 1066 } else if (n < 0 && errno != EINTR && errno != EWOULDBLOCK) 1067 log_warn("recvfrom udp"); 1068 } 1069 1070 void 1071 unix_readcb(int fd, short event, void *arg) 1072 { 1073 struct sockaddr_un sa; 1074 socklen_t salen; 1075 ssize_t n; 1076 1077 salen = sizeof(sa); 1078 n = recvfrom(fd, linebuf, LOG_MAXLINE, 0, (struct sockaddr *)&sa, 1079 &salen); 1080 if (n > 0) { 1081 linebuf[n] = '\0'; 1082 printline(LocalHostName, linebuf); 1083 } else if (n < 0 && errno != EINTR && errno != EWOULDBLOCK) 1084 log_warn("recvfrom unix"); 1085 } 1086 1087 int 1088 reserve_accept4(int lfd, int event, struct event *ev, 1089 void (*cb)(int, short, void *), 1090 struct sockaddr *sa, socklen_t *salen, int flags) 1091 { 1092 struct timeval to = { 1, 0 }; 1093 int afd; 1094 1095 if (event & EV_TIMEOUT) { 1096 log_debug("Listen again"); 1097 /* Enable the listen event, there is no timeout anymore. */ 1098 event_set(ev, lfd, EV_READ|EV_PERSIST, cb, ev); 1099 event_add(ev, NULL); 1100 errno = EWOULDBLOCK; 1101 return (-1); 1102 } 1103 1104 if (getdtablecount() + FD_RESERVE >= getdtablesize()) { 1105 afd = -1; 1106 errno = EMFILE; 1107 } else 1108 afd = accept4(lfd, sa, salen, flags); 1109 1110 if (afd == -1 && (errno == ENFILE || errno == EMFILE)) { 1111 log_info(LOG_WARNING, "accept deferred: %s", strerror(errno)); 1112 /* 1113 * Disable the listen event and convert it to a timeout. 1114 * Pass the listen file descriptor to the callback. 1115 */ 1116 event_del(ev); 1117 event_set(ev, lfd, 0, cb, ev); 1118 event_add(ev, &to); 1119 return (-1); 1120 } 1121 1122 return (afd); 1123 } 1124 1125 void 1126 tcp_acceptcb(int lfd, short event, void *arg) 1127 { 1128 acceptcb(lfd, event, arg, 0); 1129 } 1130 1131 void 1132 tls_acceptcb(int lfd, short event, void *arg) 1133 { 1134 acceptcb(lfd, event, arg, 1); 1135 } 1136 1137 void 1138 acceptcb(int lfd, short event, void *arg, int usetls) 1139 { 1140 struct event *ev = arg; 1141 struct peer *p; 1142 struct sockaddr_storage ss; 1143 socklen_t sslen; 1144 char hostname[NI_MAXHOST], servname[NI_MAXSERV]; 1145 char *peername; 1146 int fd; 1147 1148 sslen = sizeof(ss); 1149 if ((fd = reserve_accept4(lfd, event, ev, tcp_acceptcb, 1150 (struct sockaddr *)&ss, &sslen, SOCK_NONBLOCK)) == -1) { 1151 if (errno != ENFILE && errno != EMFILE && 1152 errno != EINTR && errno != EWOULDBLOCK && 1153 errno != ECONNABORTED) 1154 log_warn("accept tcp socket"); 1155 return; 1156 } 1157 log_debug("Accepting tcp connection"); 1158 1159 if (getnameinfo((struct sockaddr *)&ss, sslen, hostname, 1160 sizeof(hostname), servname, sizeof(servname), 1161 NI_NUMERICHOST | NI_NUMERICSERV) != 0 || 1162 asprintf(&peername, ss.ss_family == AF_INET6 ? 1163 "[%s]:%s" : "%s:%s", hostname, servname) == -1) { 1164 log_debug("Malformed accept address"); 1165 peername = hostname_unknown; 1166 } 1167 log_debug("Peer addresss and port %s", peername); 1168 if ((p = malloc(sizeof(*p))) == NULL) { 1169 log_warn("allocate \"%s\"", peername); 1170 close(fd); 1171 return; 1172 } 1173 p->p_fd = fd; 1174 if ((p->p_bufev = bufferevent_new(fd, tcp_readcb, NULL, tcp_closecb, 1175 p)) == NULL) { 1176 log_warn("bufferevent \"%s\"", peername); 1177 free(p); 1178 close(fd); 1179 return; 1180 } 1181 p->p_ctx = NULL; 1182 if (usetls) { 1183 if (tls_accept_socket(server_ctx, &p->p_ctx, fd) < 0) { 1184 log_warnx("tls_accept_socket \"%s\": %s", 1185 peername, tls_error(server_ctx)); 1186 bufferevent_free(p->p_bufev); 1187 free(p); 1188 close(fd); 1189 return; 1190 } 1191 buffertls_set(&p->p_buftls, p->p_bufev, p->p_ctx, fd); 1192 buffertls_accept(&p->p_buftls, fd); 1193 log_debug("tcp accept callback: tls context success"); 1194 } 1195 if (!NoDNS && peername != hostname_unknown && 1196 priv_getnameinfo((struct sockaddr *)&ss, ss.ss_len, hostname, 1197 sizeof(hostname)) != 0) { 1198 log_debug("Host name for accept address (%s) unknown", 1199 hostname); 1200 } 1201 if (peername == hostname_unknown || 1202 (p->p_hostname = strdup(hostname)) == NULL) 1203 p->p_hostname = hostname_unknown; 1204 log_debug("Peer hostname %s", hostname); 1205 p->p_peername = peername; 1206 bufferevent_enable(p->p_bufev, EV_READ); 1207 1208 log_info(LOG_DEBUG, "%s logger \"%s\" accepted", 1209 p->p_ctx ? "tls" : "tcp", peername); 1210 } 1211 1212 /* 1213 * Syslog over TCP RFC 6587 3.4.1. Octet Counting 1214 */ 1215 int 1216 octet_counting(struct evbuffer *evbuf, char **msg, int drain) 1217 { 1218 char *p, *buf, *end; 1219 int len; 1220 1221 buf = EVBUFFER_DATA(evbuf); 1222 end = buf + EVBUFFER_LENGTH(evbuf); 1223 /* 1224 * It can be assumed that octet-counting framing is used if a syslog 1225 * frame starts with a digit. 1226 */ 1227 if (buf >= end || !isdigit((unsigned char)*buf)) 1228 return (-1); 1229 /* 1230 * SYSLOG-FRAME = MSG-LEN SP SYSLOG-MSG 1231 * MSG-LEN is the octet count of the SYSLOG-MSG in the SYSLOG-FRAME. 1232 * We support up to 5 digits in MSG-LEN, so the maximum is 99999. 1233 */ 1234 for (p = buf; p < end && p < buf + 5; p++) { 1235 if (!isdigit((unsigned char)*p)) 1236 break; 1237 } 1238 if (buf >= p || p >= end || *p != ' ') 1239 return (-1); 1240 p++; 1241 /* Using atoi() is safe as buf starts with 1 to 5 digits and a space. */ 1242 len = atoi(buf); 1243 if (drain) 1244 log_debugadd(" octet counting %d", len); 1245 if (p + len > end) 1246 return (0); 1247 if (drain) 1248 evbuffer_drain(evbuf, p - buf); 1249 if (msg) 1250 *msg = p; 1251 return (len); 1252 } 1253 1254 /* 1255 * Syslog over TCP RFC 6587 3.4.2. Non-Transparent-Framing 1256 */ 1257 int 1258 non_transparent_framing(struct evbuffer *evbuf, char **msg) 1259 { 1260 char *p, *buf, *end; 1261 1262 buf = EVBUFFER_DATA(evbuf); 1263 end = buf + EVBUFFER_LENGTH(evbuf); 1264 /* 1265 * The TRAILER has usually been a single character and most often 1266 * is ASCII LF (%d10). However, other characters have also been 1267 * seen, with ASCII NUL (%d00) being a prominent example. 1268 */ 1269 for (p = buf; p < end; p++) { 1270 if (*p == '\0' || *p == '\n') 1271 break; 1272 } 1273 if (p + 1 - buf >= INT_MAX) 1274 return (-1); 1275 log_debugadd(" non transparent framing"); 1276 if (p >= end) 1277 return (0); 1278 /* 1279 * Some devices have also been seen to emit a two-character 1280 * TRAILER, which is usually CR and LF. 1281 */ 1282 if (buf < p && p[0] == '\n' && p[-1] == '\r') 1283 p[-1] = '\0'; 1284 if (msg) 1285 *msg = buf; 1286 return (p + 1 - buf); 1287 } 1288 1289 void 1290 tcp_readcb(struct bufferevent *bufev, void *arg) 1291 { 1292 struct peer *p = arg; 1293 char *msg; 1294 int len; 1295 1296 while (EVBUFFER_LENGTH(bufev->input) > 0) { 1297 log_debugadd("%s logger \"%s\"", p->p_ctx ? "tls" : "tcp", 1298 p->p_peername); 1299 msg = NULL; 1300 len = octet_counting(bufev->input, &msg, 1); 1301 if (len < 0) 1302 len = non_transparent_framing(bufev->input, &msg); 1303 if (len < 0) 1304 log_debugadd("unknown method"); 1305 if (msg == NULL) { 1306 log_debugadd(", incomplete frame"); 1307 break; 1308 } 1309 log_debug(", use %d bytes", len); 1310 if (len > 0 && msg[len-1] == '\n') 1311 msg[len-1] = '\0'; 1312 if (len == 0 || msg[len-1] != '\0') { 1313 memcpy(linebuf, msg, MINIMUM(len, LOG_MAXLINE)); 1314 linebuf[MINIMUM(len, LOG_MAXLINE)] = '\0'; 1315 msg = linebuf; 1316 } 1317 printline(p->p_hostname, msg); 1318 evbuffer_drain(bufev->input, len); 1319 } 1320 /* Maximum frame has 5 digits, 1 space, MAXLINE chars, 1 new line. */ 1321 if (EVBUFFER_LENGTH(bufev->input) >= 5 + 1 + LOG_MAXLINE + 1) { 1322 log_debug(", use %zu bytes", EVBUFFER_LENGTH(bufev->input)); 1323 printline(p->p_hostname, EVBUFFER_DATA(bufev->input)); 1324 evbuffer_drain(bufev->input, -1); 1325 } else if (EVBUFFER_LENGTH(bufev->input) > 0) 1326 log_debug(", buffer %zu bytes", EVBUFFER_LENGTH(bufev->input)); 1327 } 1328 1329 void 1330 tcp_closecb(struct bufferevent *bufev, short event, void *arg) 1331 { 1332 struct peer *p = arg; 1333 1334 if (event & EVBUFFER_EOF) { 1335 log_info(LOG_DEBUG, "%s logger \"%s\" connection close", 1336 p->p_ctx ? "tls" : "tcp", p->p_peername); 1337 } else { 1338 log_info(LOG_NOTICE, "%s logger \"%s\" connection error: %s", 1339 p->p_ctx ? "tls" : "tcp", p->p_peername, 1340 p->p_ctx ? tls_error(p->p_ctx) : strerror(errno)); 1341 } 1342 1343 if (p->p_peername != hostname_unknown) 1344 free(p->p_peername); 1345 if (p->p_hostname != hostname_unknown) 1346 free(p->p_hostname); 1347 bufferevent_free(p->p_bufev); 1348 close(p->p_fd); 1349 free(p); 1350 } 1351 1352 int 1353 tcp_socket(struct filed *f) 1354 { 1355 int s; 1356 1357 if ((s = socket(f->f_un.f_forw.f_addr.ss_family, 1358 SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP)) == -1) { 1359 log_warn("socket \"%s\"", f->f_un.f_forw.f_loghost); 1360 return (-1); 1361 } 1362 set_sockbuf(s); 1363 if (connect(s, (struct sockaddr *)&f->f_un.f_forw.f_addr, 1364 f->f_un.f_forw.f_addr.ss_len) == -1 && errno != EINPROGRESS) { 1365 log_warn("connect \"%s\"", f->f_un.f_forw.f_loghost); 1366 close(s); 1367 return (-1); 1368 } 1369 return (s); 1370 } 1371 1372 void 1373 tcp_dropcb(struct bufferevent *bufev, void *arg) 1374 { 1375 struct filed *f = arg; 1376 1377 /* 1378 * Drop data received from the forward log server. 1379 */ 1380 log_debug("loghost \"%s\" did send %zu bytes back", 1381 f->f_un.f_forw.f_loghost, EVBUFFER_LENGTH(bufev->input)); 1382 evbuffer_drain(bufev->input, -1); 1383 } 1384 1385 void 1386 tcp_writecb(struct bufferevent *bufev, void *arg) 1387 { 1388 struct filed *f = arg; 1389 char ebuf[ERRBUFSIZE]; 1390 1391 /* 1392 * Successful write, connection to server is good, reset wait time. 1393 */ 1394 log_debug("loghost \"%s\" successful write", f->f_un.f_forw.f_loghost); 1395 f->f_un.f_forw.f_reconnectwait = 0; 1396 1397 if (f->f_dropped > 0 && 1398 EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->output) < MAX_TCPBUF) { 1399 snprintf(ebuf, sizeof(ebuf), "to loghost \"%s\"", 1400 f->f_un.f_forw.f_loghost); 1401 dropped_warn(&f->f_dropped, ebuf); 1402 } 1403 } 1404 1405 void 1406 tcp_errorcb(struct bufferevent *bufev, short event, void *arg) 1407 { 1408 struct filed *f = arg; 1409 char *p, *buf, *end; 1410 int l; 1411 char ebuf[ERRBUFSIZE]; 1412 1413 if (event & EVBUFFER_EOF) 1414 snprintf(ebuf, sizeof(ebuf), "loghost \"%s\" connection close", 1415 f->f_un.f_forw.f_loghost); 1416 else 1417 snprintf(ebuf, sizeof(ebuf), 1418 "loghost \"%s\" connection error: %s", 1419 f->f_un.f_forw.f_loghost, f->f_un.f_forw.f_ctx ? 1420 tls_error(f->f_un.f_forw.f_ctx) : strerror(errno)); 1421 log_debug("%s", ebuf); 1422 1423 /* The SIGHUP handler may also close the socket, so invalidate it. */ 1424 if (f->f_un.f_forw.f_ctx) { 1425 tls_close(f->f_un.f_forw.f_ctx); 1426 tls_free(f->f_un.f_forw.f_ctx); 1427 f->f_un.f_forw.f_ctx = NULL; 1428 } 1429 close(f->f_file); 1430 f->f_file = -1; 1431 1432 /* 1433 * The messages in the output buffer may be out of sync. 1434 * Check that the buffer starts with "1234 <1234 octets>\n". 1435 * Otherwise remove the partial message from the beginning. 1436 */ 1437 buf = EVBUFFER_DATA(bufev->output); 1438 end = buf + EVBUFFER_LENGTH(bufev->output); 1439 if (buf < end && !((l = octet_counting(bufev->output, &p, 0)) > 0 && 1440 p[l-1] == '\n')) { 1441 for (p = buf; p < end; p++) { 1442 if (*p == '\n') { 1443 evbuffer_drain(bufev->output, p - buf + 1); 1444 break; 1445 } 1446 } 1447 /* Without '\n' discard everything. */ 1448 if (p == end) 1449 evbuffer_drain(bufev->output, -1); 1450 log_debug("loghost \"%s\" dropped partial message", 1451 f->f_un.f_forw.f_loghost); 1452 f->f_dropped++; 1453 } 1454 1455 tcp_connect_retry(bufev, f); 1456 1457 /* Log the connection error to the fresh buffer after reconnecting. */ 1458 log_info(LOG_WARNING, "%s", ebuf); 1459 } 1460 1461 void 1462 tcp_connectcb(int fd, short event, void *arg) 1463 { 1464 struct filed *f = arg; 1465 struct bufferevent *bufev = f->f_un.f_forw.f_bufev; 1466 int s; 1467 1468 if ((s = tcp_socket(f)) == -1) { 1469 tcp_connect_retry(bufev, f); 1470 return; 1471 } 1472 log_debug("tcp connect callback: socket success, event %#x", event); 1473 f->f_file = s; 1474 1475 bufferevent_setfd(bufev, s); 1476 bufferevent_setcb(bufev, tcp_dropcb, tcp_writecb, tcp_errorcb, f); 1477 /* 1478 * Although syslog is a write only protocol, enable reading from 1479 * the socket to detect connection close and errors. 1480 */ 1481 bufferevent_enable(bufev, EV_READ|EV_WRITE); 1482 1483 if (f->f_type == F_FORWTLS) { 1484 if ((f->f_un.f_forw.f_ctx = tls_client()) == NULL) { 1485 log_warn("tls_client \"%s\"", f->f_un.f_forw.f_loghost); 1486 goto error; 1487 } 1488 if (client_config && 1489 tls_configure(f->f_un.f_forw.f_ctx, client_config) == -1) { 1490 log_warnx("tls_configure \"%s\": %s", 1491 f->f_un.f_forw.f_loghost, 1492 tls_error(f->f_un.f_forw.f_ctx)); 1493 goto error; 1494 } 1495 if (tls_connect_socket(f->f_un.f_forw.f_ctx, s, 1496 f->f_un.f_forw.f_host) == -1) { 1497 log_warnx("tls_connect_socket \"%s\": %s", 1498 f->f_un.f_forw.f_loghost, 1499 tls_error(f->f_un.f_forw.f_ctx)); 1500 goto error; 1501 } 1502 log_debug("tcp connect callback: tls context success"); 1503 1504 buffertls_set(&f->f_un.f_forw.f_buftls, bufev, 1505 f->f_un.f_forw.f_ctx, s); 1506 buffertls_connect(&f->f_un.f_forw.f_buftls, s); 1507 } 1508 1509 return; 1510 1511 error: 1512 if (f->f_un.f_forw.f_ctx) { 1513 tls_free(f->f_un.f_forw.f_ctx); 1514 f->f_un.f_forw.f_ctx = NULL; 1515 } 1516 close(f->f_file); 1517 f->f_file = -1; 1518 tcp_connect_retry(bufev, f); 1519 } 1520 1521 void 1522 tcp_connect_retry(struct bufferevent *bufev, struct filed *f) 1523 { 1524 struct timeval to; 1525 1526 if (f->f_un.f_forw.f_reconnectwait == 0) 1527 f->f_un.f_forw.f_reconnectwait = 1; 1528 else 1529 f->f_un.f_forw.f_reconnectwait <<= 1; 1530 if (f->f_un.f_forw.f_reconnectwait > 600) 1531 f->f_un.f_forw.f_reconnectwait = 600; 1532 to.tv_sec = f->f_un.f_forw.f_reconnectwait; 1533 to.tv_usec = 0; 1534 1535 log_debug("tcp connect retry: wait %d", 1536 f->f_un.f_forw.f_reconnectwait); 1537 bufferevent_setfd(bufev, -1); 1538 /* We can reuse the write event as bufferevent is disabled. */ 1539 evtimer_set(&bufev->ev_write, tcp_connectcb, f); 1540 evtimer_add(&bufev->ev_write, &to); 1541 } 1542 1543 int 1544 tcpbuf_countmsg(struct bufferevent *bufev) 1545 { 1546 char *p, *buf, *end; 1547 int i = 0; 1548 1549 buf = EVBUFFER_DATA(bufev->output); 1550 end = buf + EVBUFFER_LENGTH(bufev->output); 1551 for (p = buf; p < end; p++) { 1552 if (*p == '\n') 1553 i++; 1554 } 1555 return (i); 1556 } 1557 1558 void 1559 usage(void) 1560 { 1561 1562 (void)fprintf(stderr, 1563 "usage: syslogd [-46dFhnruVZ] [-a path] [-C CAfile]\n" 1564 "\t[-c cert_file] [-f config_file] [-K CAfile] [-k key_file]\n" 1565 "\t[-m mark_interval] [-p log_socket] [-S listen_address]\n" 1566 "\t[-s reporting_socket] [-T listen_address] [-U bind_address]\n"); 1567 exit(1); 1568 } 1569 1570 /* 1571 * Parse a priority code of the form "<123>" into pri, and return the 1572 * length of the priority code including the surrounding angle brackets. 1573 */ 1574 size_t 1575 parsepriority(const char *msg, int *pri) 1576 { 1577 size_t nlen; 1578 char buf[11]; 1579 const char *errstr; 1580 int maybepri; 1581 1582 if (*msg++ == '<') { 1583 nlen = strspn(msg, "1234567890"); 1584 if (nlen > 0 && nlen < sizeof(buf) && msg[nlen] == '>') { 1585 strlcpy(buf, msg, nlen + 1); 1586 maybepri = strtonum(buf, 0, INT_MAX, &errstr); 1587 if (errstr == NULL) { 1588 *pri = maybepri; 1589 return nlen + 2; 1590 } 1591 } 1592 } 1593 1594 return 0; 1595 } 1596 1597 /* 1598 * Take a raw input line, decode the message, and print the message 1599 * on the appropriate log files. 1600 */ 1601 void 1602 printline(char *hname, char *msg) 1603 { 1604 int pri; 1605 char *p, *q, line[LOG_MAXLINE + 4 + 1]; /* message, encoding, NUL */ 1606 1607 /* test for special codes */ 1608 pri = DEFUPRI; 1609 p = msg; 1610 p += parsepriority(p, &pri); 1611 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1612 pri = DEFUPRI; 1613 1614 /* 1615 * Don't allow users to log kernel messages. 1616 * NOTE: since LOG_KERN == 0 this will also match 1617 * messages with no facility specified. 1618 */ 1619 if (LOG_FAC(pri) == LOG_KERN) 1620 pri = LOG_USER | LOG_PRI(pri); 1621 1622 for (q = line; *p && q < &line[LOG_MAXLINE]; p++) { 1623 if (*p == '\n') 1624 *q++ = ' '; 1625 else 1626 q = vis(q, *p, 0, 0); 1627 } 1628 line[LOG_MAXLINE] = *q = '\0'; 1629 1630 logline(pri, 0, hname, line); 1631 } 1632 1633 /* 1634 * Take a raw input line from /dev/klog, split and format similar to syslog(). 1635 */ 1636 void 1637 printsys(char *msg) 1638 { 1639 int c, pri, flags; 1640 char *lp, *p, *q, line[LOG_MAXLINE + 1]; 1641 size_t prilen; 1642 1643 (void)snprintf(line, sizeof line, "%s: ", _PATH_UNIX); 1644 lp = line + strlen(line); 1645 for (p = msg; *p != '\0'; ) { 1646 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 1647 pri = DEFSPRI; 1648 prilen = parsepriority(p, &pri); 1649 p += prilen; 1650 if (prilen == 0) { 1651 /* kernel printf's come out on console */ 1652 flags |= IGN_CONS; 1653 } 1654 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1655 pri = DEFSPRI; 1656 1657 q = lp; 1658 while (*p && (c = *p++) != '\n' && q < &line[sizeof(line) - 4]) 1659 q = vis(q, c, 0, 0); 1660 1661 logline(pri, flags, LocalHostName, line); 1662 } 1663 } 1664 1665 void 1666 vlogmsg(int pri, const char *proc, const char *fmt, va_list ap) 1667 { 1668 char msg[ERRBUFSIZE]; 1669 size_t l; 1670 1671 l = snprintf(msg, sizeof(msg), "%s[%d]: ", proc, getpid()); 1672 if (l < sizeof(msg)) 1673 vsnprintf(msg + l, sizeof(msg) - l, fmt, ap); 1674 if (!Started) { 1675 fprintf(stderr, "%s\n", msg); 1676 init_dropped++; 1677 return; 1678 } 1679 logline(pri, ADDDATE, LocalHostName, msg); 1680 } 1681 1682 struct timeval now; 1683 1684 /* 1685 * Log a message to the appropriate log files, users, etc. based on 1686 * the priority. 1687 */ 1688 void 1689 logline(int pri, int flags, char *from, char *msg) 1690 { 1691 struct filed *f; 1692 int fac, msglen, prilev, i; 1693 char timestamp[33]; 1694 char prog[NAME_MAX+1]; 1695 1696 log_debug("logline: pri 0%o, flags 0x%x, from %s, msg %s", 1697 pri, flags, from, msg); 1698 1699 /* 1700 * Check to see if msg looks non-standard. 1701 */ 1702 timestamp[0] = '\0'; 1703 msglen = strlen(msg); 1704 if ((flags & ADDDATE) == 0) { 1705 if (msglen >= 16 && msg[3] == ' ' && msg[6] == ' ' && 1706 msg[9] == ':' && msg[12] == ':' && msg[15] == ' ') { 1707 /* BSD syslog TIMESTAMP, RFC 3164 */ 1708 strlcpy(timestamp, msg, 16); 1709 msg += 16; 1710 msglen -= 16; 1711 if (ZuluTime) 1712 flags |= ADDDATE; 1713 } else if (msglen >= 20 && 1714 isdigit(msg[0]) && isdigit(msg[1]) && isdigit(msg[2]) && 1715 isdigit(msg[3]) && msg[4] == '-' && 1716 isdigit(msg[5]) && isdigit(msg[6]) && msg[7] == '-' && 1717 isdigit(msg[8]) && isdigit(msg[9]) && msg[10] == 'T' && 1718 isdigit(msg[11]) && isdigit(msg[12]) && msg[13] == ':' && 1719 isdigit(msg[14]) && isdigit(msg[15]) && msg[16] == ':' && 1720 isdigit(msg[17]) && isdigit(msg[18]) && (msg[19] == '.' || 1721 msg[19] == 'Z' || msg[19] == '+' || msg[19] == '-')) { 1722 /* FULL-DATE "T" FULL-TIME, RFC 5424 */ 1723 strlcpy(timestamp, msg, sizeof(timestamp)); 1724 msg += 19; 1725 msglen -= 19; 1726 i = 0; 1727 if (msglen >= 3 && msg[0] == '.' && isdigit(msg[1])) { 1728 /* TIME-SECFRAC */ 1729 msg += 2; 1730 msglen -= 2; 1731 i += 2; 1732 while(i < 7 && msglen >= 1 && isdigit(msg[0])) { 1733 msg++; 1734 msglen--; 1735 i++; 1736 } 1737 } 1738 if (msglen >= 2 && msg[0] == 'Z' && msg[1] == ' ') { 1739 /* "Z" */ 1740 timestamp[20+i] = '\0'; 1741 msg += 2; 1742 msglen -= 2; 1743 } else if (msglen >= 7 && 1744 (msg[0] == '+' || msg[0] == '-') && 1745 isdigit(msg[1]) && isdigit(msg[2]) && 1746 msg[3] == ':' && 1747 isdigit(msg[4]) && isdigit(msg[5]) && 1748 msg[6] == ' ') { 1749 /* TIME-NUMOFFSET */ 1750 timestamp[25+i] = '\0'; 1751 msg += 7; 1752 msglen -= 7; 1753 } else { 1754 /* invalid time format, roll back */ 1755 timestamp[0] = '\0'; 1756 msg -= 19 + i; 1757 msglen += 19 + i; 1758 flags |= ADDDATE; 1759 } 1760 } else if (msglen >= 2 && msg[0] == '-' && msg[1] == ' ') { 1761 /* NILVALUE, RFC 5424 */ 1762 msg += 2; 1763 msglen -= 2; 1764 flags |= ADDDATE; 1765 } else 1766 flags |= ADDDATE; 1767 } 1768 1769 (void)gettimeofday(&now, NULL); 1770 if (flags & ADDDATE) { 1771 if (ZuluTime) { 1772 struct tm *tm; 1773 size_t l; 1774 1775 tm = gmtime(&now.tv_sec); 1776 l = strftime(timestamp, sizeof(timestamp), "%FT%T", tm); 1777 /* 1778 * Use only millisecond precision as some time has 1779 * passed since syslog(3) was called. 1780 */ 1781 snprintf(timestamp + l, sizeof(timestamp) - l, 1782 ".%03ldZ", now.tv_usec / 1000); 1783 } else 1784 strlcpy(timestamp, ctime(&now.tv_sec) + 4, 16); 1785 } 1786 1787 /* extract facility and priority level */ 1788 if (flags & MARK) 1789 fac = LOG_NFACILITIES; 1790 else { 1791 fac = LOG_FAC(pri); 1792 if (fac >= LOG_NFACILITIES || fac < 0) 1793 fac = LOG_USER; 1794 } 1795 prilev = LOG_PRI(pri); 1796 1797 /* extract program name */ 1798 while (isspace((unsigned char)*msg)) { 1799 msg++; 1800 msglen--; 1801 } 1802 for (i = 0; i < NAME_MAX; i++) { 1803 if (!isalnum((unsigned char)msg[i]) && 1804 msg[i] != '-' && msg[i] != '.' && msg[i] != '_') 1805 break; 1806 prog[i] = msg[i]; 1807 } 1808 prog[i] = 0; 1809 1810 /* log the message to the particular outputs */ 1811 if (!Initialized) { 1812 f = &consfile; 1813 if (f->f_type == F_CONSOLE) { 1814 strlcpy(f->f_lasttime, timestamp, 1815 sizeof(f->f_lasttime)); 1816 strlcpy(f->f_prevhost, from, 1817 sizeof(f->f_prevhost)); 1818 fprintlog(f, flags, msg); 1819 /* May be set to F_UNUSED, try again next time. */ 1820 f->f_type = F_CONSOLE; 1821 } 1822 init_dropped++; 1823 return; 1824 } 1825 SIMPLEQ_FOREACH(f, &Files, f_next) { 1826 /* skip messages that are incorrect priority */ 1827 if (f->f_pmask[fac] < prilev || 1828 f->f_pmask[fac] == INTERNAL_NOPRI) 1829 continue; 1830 1831 /* skip messages with the incorrect program or hostname */ 1832 if (f->f_program && fnmatch(f->f_program, prog, 0) != 0) 1833 continue; 1834 if (f->f_hostname && fnmatch(f->f_hostname, from, 0) != 0) 1835 continue; 1836 1837 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1838 continue; 1839 1840 /* don't output marks to recently written files */ 1841 if ((flags & MARK) && 1842 (now.tv_sec - f->f_time) < MarkInterval / 2) 1843 continue; 1844 1845 /* 1846 * suppress duplicate lines to this file 1847 */ 1848 if ((Repeat == 0 || (Repeat == 1 && 1849 (f->f_type != F_PIPE && f->f_type != F_FORWUDP && 1850 f->f_type != F_FORWTCP && f->f_type != F_FORWTLS))) && 1851 (flags & MARK) == 0 && msglen == f->f_prevlen && 1852 !strcmp(msg, f->f_prevline) && 1853 !strcmp(from, f->f_prevhost)) { 1854 strlcpy(f->f_lasttime, timestamp, 1855 sizeof(f->f_lasttime)); 1856 f->f_prevcount++; 1857 log_debug("msg repeated %d times, %ld sec of %d", 1858 f->f_prevcount, (long)(now.tv_sec - f->f_time), 1859 repeatinterval[f->f_repeatcount]); 1860 /* 1861 * If domark would have logged this by now, 1862 * flush it now (so we don't hold isolated messages), 1863 * but back off so we'll flush less often 1864 * in the future. 1865 */ 1866 if (now.tv_sec > REPEATTIME(f)) { 1867 fprintlog(f, flags, (char *)NULL); 1868 BACKOFF(f); 1869 } 1870 } else { 1871 /* new line, save it */ 1872 if (f->f_prevcount) 1873 fprintlog(f, 0, (char *)NULL); 1874 f->f_repeatcount = 0; 1875 f->f_prevpri = pri; 1876 strlcpy(f->f_lasttime, timestamp, 1877 sizeof(f->f_lasttime)); 1878 strlcpy(f->f_prevhost, from, 1879 sizeof(f->f_prevhost)); 1880 if (msglen < MAXSVLINE) { 1881 f->f_prevlen = msglen; 1882 strlcpy(f->f_prevline, msg, 1883 sizeof(f->f_prevline)); 1884 fprintlog(f, flags, (char *)NULL); 1885 } else { 1886 f->f_prevline[0] = 0; 1887 f->f_prevlen = 0; 1888 fprintlog(f, flags, msg); 1889 } 1890 } 1891 1892 if (f->f_quick) 1893 break; 1894 } 1895 } 1896 1897 void 1898 fprintlog(struct filed *f, int flags, char *msg) 1899 { 1900 struct iovec iov[6]; 1901 struct iovec *v; 1902 int l, retryonce; 1903 char line[LOG_MAXLINE + 1], repbuf[80], greetings[500]; 1904 char ebuf[ERRBUFSIZE]; 1905 1906 v = iov; 1907 if (f->f_type == F_WALL) { 1908 l = snprintf(greetings, sizeof(greetings), 1909 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1910 f->f_prevhost, ctime(&now.tv_sec)); 1911 if (l < 0 || (size_t)l >= sizeof(greetings)) 1912 l = strlen(greetings); 1913 v->iov_base = greetings; 1914 v->iov_len = l; 1915 v++; 1916 v->iov_base = ""; 1917 v->iov_len = 0; 1918 v++; 1919 } else if (f->f_lasttime[0] != '\0') { 1920 v->iov_base = f->f_lasttime; 1921 v->iov_len = strlen(f->f_lasttime); 1922 v++; 1923 v->iov_base = " "; 1924 v->iov_len = 1; 1925 v++; 1926 } else { 1927 v->iov_base = ""; 1928 v->iov_len = 0; 1929 v++; 1930 v->iov_base = ""; 1931 v->iov_len = 0; 1932 v++; 1933 } 1934 if (f->f_prevhost[0] != '\0') { 1935 v->iov_base = f->f_prevhost; 1936 v->iov_len = strlen(v->iov_base); 1937 v++; 1938 v->iov_base = " "; 1939 v->iov_len = 1; 1940 v++; 1941 } else { 1942 v->iov_base = ""; 1943 v->iov_len = 0; 1944 v++; 1945 v->iov_base = ""; 1946 v->iov_len = 0; 1947 v++; 1948 } 1949 1950 if (msg) { 1951 v->iov_base = msg; 1952 v->iov_len = strlen(msg); 1953 } else if (f->f_prevcount > 1) { 1954 l = snprintf(repbuf, sizeof(repbuf), 1955 "last message repeated %d times", f->f_prevcount); 1956 if (l < 0 || (size_t)l >= sizeof(repbuf)) 1957 l = strlen(repbuf); 1958 v->iov_base = repbuf; 1959 v->iov_len = l; 1960 } else { 1961 v->iov_base = f->f_prevline; 1962 v->iov_len = f->f_prevlen; 1963 } 1964 v++; 1965 1966 log_debugadd("Logging to %s", TypeNames[f->f_type]); 1967 f->f_time = now.tv_sec; 1968 1969 switch (f->f_type) { 1970 case F_UNUSED: 1971 log_debug("%s", ""); 1972 break; 1973 1974 case F_FORWUDP: 1975 log_debug(" %s", f->f_un.f_forw.f_loghost); 1976 l = snprintf(line, MINIMUM(MAX_UDPMSG + 1, sizeof(line)), 1977 "<%d>%.32s %s%s%s", f->f_prevpri, (char *)iov[0].iov_base, 1978 IncludeHostname ? LocalHostName : "", 1979 IncludeHostname ? " " : "", 1980 (char *)iov[4].iov_base); 1981 if (l < 0 || (size_t)l > MINIMUM(MAX_UDPMSG, sizeof(line))) 1982 l = MINIMUM(MAX_UDPMSG, sizeof(line)); 1983 if (sendto(f->f_file, line, l, 0, 1984 (struct sockaddr *)&f->f_un.f_forw.f_addr, 1985 f->f_un.f_forw.f_addr.ss_len) != l) { 1986 switch (errno) { 1987 case EADDRNOTAVAIL: 1988 case EHOSTDOWN: 1989 case EHOSTUNREACH: 1990 case ENETDOWN: 1991 case ENETUNREACH: 1992 case ENOBUFS: 1993 case EWOULDBLOCK: 1994 /* silently dropped */ 1995 break; 1996 default: 1997 f->f_type = F_UNUSED; 1998 log_warn("sendto \"%s\"", 1999 f->f_un.f_forw.f_loghost); 2000 break; 2001 } 2002 } 2003 break; 2004 2005 case F_FORWTCP: 2006 case F_FORWTLS: 2007 log_debugadd(" %s", f->f_un.f_forw.f_loghost); 2008 if (EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->output) >= 2009 MAX_TCPBUF) { 2010 log_debug(" (dropped)"); 2011 f->f_dropped++; 2012 break; 2013 } 2014 /* 2015 * Syslog over TLS RFC 5425 4.3. Sending Data 2016 * Syslog over TCP RFC 6587 3.4.1. Octet Counting 2017 * Use an additional '\n' to split messages. This allows 2018 * buffer synchronisation, helps legacy implementations, 2019 * and makes line based testing easier. 2020 */ 2021 l = snprintf(line, sizeof(line), "<%d>%.32s %s%s\n", 2022 f->f_prevpri, (char *)iov[0].iov_base, 2023 IncludeHostname ? LocalHostName : "", 2024 IncludeHostname ? " " : ""); 2025 if (l < 0) { 2026 log_debug(" (dropped snprintf)"); 2027 f->f_dropped++; 2028 break; 2029 } 2030 l = evbuffer_add_printf(f->f_un.f_forw.f_bufev->output, 2031 "%zu <%d>%.32s %s%s%s\n", 2032 (size_t)l + strlen(iov[4].iov_base), 2033 f->f_prevpri, (char *)iov[0].iov_base, 2034 IncludeHostname ? LocalHostName : "", 2035 IncludeHostname ? " " : "", 2036 (char *)iov[4].iov_base); 2037 if (l < 0) { 2038 log_debug(" (dropped evbuffer_add_printf)"); 2039 f->f_dropped++; 2040 break; 2041 } 2042 bufferevent_enable(f->f_un.f_forw.f_bufev, EV_WRITE); 2043 log_debug("%s", ""); 2044 break; 2045 2046 case F_CONSOLE: 2047 if (flags & IGN_CONS) { 2048 log_debug(" (ignored)"); 2049 break; 2050 } 2051 /* FALLTHROUGH */ 2052 2053 case F_TTY: 2054 case F_FILE: 2055 case F_PIPE: 2056 log_debug(" %s", f->f_un.f_fname); 2057 if (f->f_type != F_FILE && f->f_type != F_PIPE) { 2058 v->iov_base = "\r\n"; 2059 v->iov_len = 2; 2060 } else { 2061 v->iov_base = "\n"; 2062 v->iov_len = 1; 2063 } 2064 retryonce = 0; 2065 again: 2066 if (writev(f->f_file, iov, 6) < 0) { 2067 int e = errno; 2068 2069 /* allow to recover from file system full */ 2070 if (e == ENOSPC && f->f_type == F_FILE) { 2071 if (f->f_dropped++ == 0) { 2072 f->f_type = F_UNUSED; 2073 errno = e; 2074 log_warn("write to file \"%s\"", 2075 f->f_un.f_fname); 2076 f->f_type = F_FILE; 2077 } 2078 break; 2079 } 2080 2081 /* pipe is non-blocking. log and drop message if full */ 2082 if (e == EAGAIN && f->f_type == F_PIPE) { 2083 if (now.tv_sec - f->f_lasterrtime > 120) { 2084 f->f_lasterrtime = now.tv_sec; 2085 log_warn("write to pipe \"%s\"", 2086 f->f_un.f_fname); 2087 } 2088 break; 2089 } 2090 2091 /* 2092 * Check for errors on TTY's or program pipes. 2093 * Errors happen due to loss of tty or died programs. 2094 */ 2095 if (e == EAGAIN) { 2096 /* 2097 * Silently drop messages on blocked write. 2098 * This can happen when logging to a locked tty. 2099 */ 2100 break; 2101 } 2102 2103 (void)close(f->f_file); 2104 if ((e == EIO || e == EBADF) && 2105 f->f_type != F_FILE && f->f_type != F_PIPE && 2106 !retryonce) { 2107 f->f_file = priv_open_tty(f->f_un.f_fname); 2108 retryonce = 1; 2109 if (f->f_file < 0) { 2110 f->f_type = F_UNUSED; 2111 log_warn("priv_open_tty \"%s\"", 2112 f->f_un.f_fname); 2113 } else 2114 goto again; 2115 } else if ((e == EPIPE || e == EBADF) && 2116 f->f_type == F_PIPE && !retryonce) { 2117 f->f_file = priv_open_log(f->f_un.f_fname); 2118 retryonce = 1; 2119 if (f->f_file < 0) { 2120 f->f_type = F_UNUSED; 2121 log_warn("priv_open_log \"%s\"", 2122 f->f_un.f_fname); 2123 } else 2124 goto again; 2125 } else { 2126 f->f_type = F_UNUSED; 2127 f->f_file = -1; 2128 errno = e; 2129 log_warn("writev \"%s\"", f->f_un.f_fname); 2130 } 2131 } else { 2132 if (flags & SYNC_FILE) 2133 (void)fsync(f->f_file); 2134 if (f->f_dropped && f->f_type == F_FILE) { 2135 snprintf(ebuf, sizeof(ebuf), "to file \"%s\"", 2136 f->f_un.f_fname); 2137 dropped_warn(&f->f_dropped, ebuf); 2138 } 2139 } 2140 break; 2141 2142 case F_USERS: 2143 case F_WALL: 2144 log_debug("%s", ""); 2145 v->iov_base = "\r\n"; 2146 v->iov_len = 2; 2147 wallmsg(f, iov); 2148 break; 2149 2150 case F_MEMBUF: 2151 log_debug("%s", ""); 2152 snprintf(line, sizeof(line), "%.32s %s %s", 2153 (char *)iov[0].iov_base, (char *)iov[2].iov_base, 2154 (char *)iov[4].iov_base); 2155 if (ringbuf_append_line(f->f_un.f_mb.f_rb, line) == 1) 2156 f->f_un.f_mb.f_overflow = 1; 2157 if (f->f_un.f_mb.f_attached) 2158 ctlconn_logto(line); 2159 break; 2160 } 2161 f->f_prevcount = 0; 2162 } 2163 2164 /* 2165 * WALLMSG -- Write a message to the world at large 2166 * 2167 * Write the specified message to either the entire 2168 * world, or a list of approved users. 2169 */ 2170 void 2171 wallmsg(struct filed *f, struct iovec *iov) 2172 { 2173 struct utmp ut; 2174 char utline[sizeof(ut.ut_line) + 1]; 2175 static int reenter; /* avoid calling ourselves */ 2176 FILE *uf; 2177 int i; 2178 2179 if (reenter++) 2180 return; 2181 if ((uf = priv_open_utmp()) == NULL) { 2182 log_warn("priv_open_utmp"); 2183 reenter = 0; 2184 return; 2185 } 2186 while (fread(&ut, sizeof(ut), 1, uf) == 1) { 2187 if (ut.ut_name[0] == '\0') 2188 continue; 2189 /* must use strncpy since ut_* may not be NUL terminated */ 2190 strncpy(utline, ut.ut_line, sizeof(utline) - 1); 2191 utline[sizeof(utline) - 1] = '\0'; 2192 if (f->f_type == F_WALL) { 2193 ttymsg(iov, 6, utline); 2194 continue; 2195 } 2196 /* should we send the message to this user? */ 2197 for (i = 0; i < MAXUNAMES; i++) { 2198 if (!f->f_un.f_uname[i][0]) 2199 break; 2200 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 2201 UT_NAMESIZE)) { 2202 ttymsg(iov, 6, utline); 2203 break; 2204 } 2205 } 2206 } 2207 (void)fclose(uf); 2208 reenter = 0; 2209 } 2210 2211 /* 2212 * Return a printable representation of a host address. 2213 */ 2214 void 2215 cvthname(struct sockaddr *f, char *result, size_t res_len) 2216 { 2217 if (getnameinfo(f, f->sa_len, result, res_len, NULL, 0, 2218 NI_NUMERICHOST|NI_NUMERICSERV|NI_DGRAM) != 0) { 2219 log_debug("Malformed from address"); 2220 strlcpy(result, hostname_unknown, res_len); 2221 return; 2222 } 2223 log_debug("cvthname(%s)", result); 2224 if (NoDNS) 2225 return; 2226 2227 if (priv_getnameinfo(f, f->sa_len, result, res_len) != 0) 2228 log_debug("Host name for from address (%s) unknown", result); 2229 } 2230 2231 void 2232 die_signalcb(int signum, short event, void *arg) 2233 { 2234 die(signum); 2235 } 2236 2237 void 2238 mark_timercb(int unused, short event, void *arg) 2239 { 2240 struct event *ev = arg; 2241 struct timeval to; 2242 2243 markit(); 2244 2245 to.tv_sec = TIMERINTVL; 2246 to.tv_usec = 0; 2247 evtimer_add(ev, &to); 2248 } 2249 2250 void 2251 init_signalcb(int signum, short event, void *arg) 2252 { 2253 init(); 2254 log_info(LOG_INFO, "restart"); 2255 2256 dropped_warn(&file_dropped, "to file"); 2257 dropped_warn(&tcpbuf_dropped, "to remote loghost"); 2258 log_debug("syslogd: restarted"); 2259 } 2260 2261 void 2262 logevent(int severity, const char *msg) 2263 { 2264 log_debug("libevent: [%d] %s", severity, msg); 2265 } 2266 2267 void 2268 dropped_warn(int *count, const char *what) 2269 { 2270 int dropped; 2271 2272 if (*count == 0) 2273 return; 2274 2275 dropped = *count; 2276 *count = 0; 2277 log_info(LOG_WARNING, "dropped %d message%s %s", 2278 dropped, dropped == 1 ? "" : "s", what); 2279 } 2280 2281 __dead void 2282 die(int signo) 2283 { 2284 struct filed *f; 2285 2286 SIMPLEQ_FOREACH(f, &Files, f_next) { 2287 /* flush any pending output */ 2288 if (f->f_prevcount) 2289 fprintlog(f, 0, (char *)NULL); 2290 if (f->f_type == F_FORWTLS || f->f_type == F_FORWTCP) { 2291 tcpbuf_dropped += f->f_dropped + 2292 tcpbuf_countmsg(f->f_un.f_forw.f_bufev); 2293 f->f_dropped = 0; 2294 } 2295 if (f->f_type == F_FILE) { 2296 file_dropped += f->f_dropped; 2297 f->f_dropped = 0; 2298 } 2299 } 2300 dropped_warn(&init_dropped, "during initialization"); 2301 dropped_warn(&file_dropped, "to file"); 2302 dropped_warn(&tcpbuf_dropped, "to remote loghost"); 2303 2304 if (signo) 2305 log_info(LOG_ERR, "exiting on signal %d", signo); 2306 log_debug("syslogd: exited"); 2307 exit(0); 2308 } 2309 2310 /* 2311 * INIT -- Initialize syslogd from configuration table 2312 */ 2313 void 2314 init(void) 2315 { 2316 char progblock[NAME_MAX+1], hostblock[NAME_MAX+1], *cline, *p, *q; 2317 struct filed_list mb; 2318 struct filed *f, *m; 2319 FILE *cf; 2320 int i; 2321 size_t s; 2322 2323 log_debug("init"); 2324 2325 /* If config file has been modified, then just die to restart */ 2326 if (priv_config_modified()) { 2327 log_debug("config file changed: dying"); 2328 die(0); 2329 } 2330 2331 /* 2332 * Close all open log files. 2333 */ 2334 Initialized = 0; 2335 SIMPLEQ_INIT(&mb); 2336 while (!SIMPLEQ_EMPTY(&Files)) { 2337 f = SIMPLEQ_FIRST(&Files); 2338 SIMPLEQ_REMOVE_HEAD(&Files, f_next); 2339 /* flush any pending output */ 2340 if (f->f_prevcount) 2341 fprintlog(f, 0, (char *)NULL); 2342 2343 switch (f->f_type) { 2344 case F_FORWTLS: 2345 if (f->f_un.f_forw.f_ctx) { 2346 tls_close(f->f_un.f_forw.f_ctx); 2347 tls_free(f->f_un.f_forw.f_ctx); 2348 } 2349 free(f->f_un.f_forw.f_host); 2350 /* FALLTHROUGH */ 2351 case F_FORWTCP: 2352 tcpbuf_dropped += f->f_dropped + 2353 tcpbuf_countmsg(f->f_un.f_forw.f_bufev); 2354 bufferevent_free(f->f_un.f_forw.f_bufev); 2355 /* FALLTHROUGH */ 2356 case F_FILE: 2357 if (f->f_type == F_FILE) { 2358 file_dropped += f->f_dropped; 2359 f->f_dropped = 0; 2360 } 2361 case F_TTY: 2362 case F_CONSOLE: 2363 case F_PIPE: 2364 (void)close(f->f_file); 2365 break; 2366 } 2367 free(f->f_program); 2368 free(f->f_hostname); 2369 if (f->f_type == F_MEMBUF) { 2370 f->f_program = NULL; 2371 f->f_hostname = NULL; 2372 log_debug("add %p to mb", f); 2373 SIMPLEQ_INSERT_HEAD(&mb, f, f_next); 2374 } else 2375 free(f); 2376 } 2377 SIMPLEQ_INIT(&Files); 2378 2379 /* open the configuration file */ 2380 if ((cf = priv_open_config()) == NULL) { 2381 log_debug("cannot open %s", ConfFile); 2382 SIMPLEQ_INSERT_TAIL(&Files, 2383 cfline("*.ERR\t/dev/console", "*", "*"), f_next); 2384 SIMPLEQ_INSERT_TAIL(&Files, 2385 cfline("*.PANIC\t*", "*", "*"), f_next); 2386 Initialized = 1; 2387 dropped_warn(&init_dropped, "during initialization"); 2388 return; 2389 } 2390 2391 /* 2392 * Foreach line in the conf table, open that file. 2393 */ 2394 cline = NULL; 2395 s = 0; 2396 strlcpy(progblock, "*", sizeof(progblock)); 2397 strlcpy(hostblock, "*", sizeof(hostblock)); 2398 while (getline(&cline, &s, cf) != -1) { 2399 /* 2400 * check for end-of-section, comments, strip off trailing 2401 * spaces and newline character. !progblock and +hostblock 2402 * are treated specially: the following lines apply only to 2403 * that program. 2404 */ 2405 for (p = cline; isspace((unsigned char)*p); ++p) 2406 continue; 2407 if (*p == '\0' || *p == '#') 2408 continue; 2409 if (*p == '!' || *p == '+') { 2410 q = (*p == '!') ? progblock : hostblock; 2411 p++; 2412 while (isspace((unsigned char)*p)) 2413 p++; 2414 if (*p == '\0' || (*p == '*' && (p[1] == '\0' || 2415 isspace((unsigned char)p[1])))) { 2416 strlcpy(q, "*", NAME_MAX+1); 2417 continue; 2418 } 2419 for (i = 0; i < NAME_MAX; i++) { 2420 if (*p == '\0' || isspace((unsigned char)*p)) 2421 break; 2422 *q++ = *p++; 2423 } 2424 *q = '\0'; 2425 continue; 2426 } 2427 2428 p = cline + strlen(cline); 2429 while (p > cline) 2430 if (!isspace((unsigned char)*--p)) { 2431 p++; 2432 break; 2433 } 2434 *p = '\0'; 2435 f = cfline(cline, progblock, hostblock); 2436 if (f != NULL) 2437 SIMPLEQ_INSERT_TAIL(&Files, f, f_next); 2438 } 2439 free(cline); 2440 if (!feof(cf)) 2441 fatal("read config file"); 2442 2443 /* Match and initialize the memory buffers */ 2444 SIMPLEQ_FOREACH(f, &Files, f_next) { 2445 if (f->f_type != F_MEMBUF) 2446 continue; 2447 log_debug("Initialize membuf %s at %p", 2448 f->f_un.f_mb.f_mname, f); 2449 2450 SIMPLEQ_FOREACH(m, &mb, f_next) { 2451 if (m->f_un.f_mb.f_rb == NULL) 2452 continue; 2453 if (strcmp(m->f_un.f_mb.f_mname, 2454 f->f_un.f_mb.f_mname) == 0) 2455 break; 2456 } 2457 if (m == NULL) { 2458 log_debug("Membuf no match"); 2459 f->f_un.f_mb.f_rb = ringbuf_init(f->f_un.f_mb.f_len); 2460 if (f->f_un.f_mb.f_rb == NULL) { 2461 f->f_type = F_UNUSED; 2462 log_warn("allocate membuf"); 2463 } 2464 } else { 2465 log_debug("Membuf match f:%p, m:%p", f, m); 2466 f->f_un = m->f_un; 2467 m->f_un.f_mb.f_rb = NULL; 2468 } 2469 } 2470 2471 /* make sure remaining buffers are freed */ 2472 while (!SIMPLEQ_EMPTY(&mb)) { 2473 m = SIMPLEQ_FIRST(&mb); 2474 SIMPLEQ_REMOVE_HEAD(&mb, f_next); 2475 if (m->f_un.f_mb.f_rb != NULL) { 2476 log_warnx("mismatched membuf"); 2477 ringbuf_free(m->f_un.f_mb.f_rb); 2478 } 2479 log_debug("Freeing membuf %p", m); 2480 2481 free(m); 2482 } 2483 2484 /* close the configuration file */ 2485 (void)fclose(cf); 2486 2487 Initialized = 1; 2488 dropped_warn(&init_dropped, "during initialization"); 2489 2490 if (Debug) { 2491 SIMPLEQ_FOREACH(f, &Files, f_next) { 2492 for (i = 0; i <= LOG_NFACILITIES; i++) 2493 if (f->f_pmask[i] == INTERNAL_NOPRI) 2494 printf("X "); 2495 else 2496 printf("%d ", f->f_pmask[i]); 2497 printf("%s: ", TypeNames[f->f_type]); 2498 switch (f->f_type) { 2499 case F_FILE: 2500 case F_TTY: 2501 case F_CONSOLE: 2502 case F_PIPE: 2503 printf("%s", f->f_un.f_fname); 2504 break; 2505 2506 case F_FORWUDP: 2507 case F_FORWTCP: 2508 case F_FORWTLS: 2509 printf("%s", f->f_un.f_forw.f_loghost); 2510 break; 2511 2512 case F_USERS: 2513 for (i = 0; i < MAXUNAMES && 2514 *f->f_un.f_uname[i]; i++) 2515 printf("%s, ", f->f_un.f_uname[i]); 2516 break; 2517 2518 case F_MEMBUF: 2519 printf("%s", f->f_un.f_mb.f_mname); 2520 break; 2521 2522 } 2523 if (f->f_program || f->f_hostname) 2524 printf(" (%s, %s)", 2525 f->f_program ? f->f_program : "*", 2526 f->f_hostname ? f->f_hostname : "*"); 2527 printf("\n"); 2528 } 2529 } 2530 } 2531 2532 #define progmatches(p1, p2) \ 2533 (p1 == p2 || (p1 != NULL && p2 != NULL && strcmp(p1, p2) == 0)) 2534 2535 /* 2536 * Spot a line with a duplicate file, pipe, console, tty, or membuf target. 2537 */ 2538 struct filed * 2539 find_dup(struct filed *f) 2540 { 2541 struct filed *list; 2542 2543 SIMPLEQ_FOREACH(list, &Files, f_next) { 2544 if (list->f_quick || f->f_quick) 2545 continue; 2546 switch (list->f_type) { 2547 case F_FILE: 2548 case F_TTY: 2549 case F_CONSOLE: 2550 case F_PIPE: 2551 if (strcmp(list->f_un.f_fname, f->f_un.f_fname) == 0 && 2552 progmatches(list->f_program, f->f_program) && 2553 progmatches(list->f_hostname, f->f_hostname)) { 2554 log_debug("duplicate %s", f->f_un.f_fname); 2555 return (list); 2556 } 2557 break; 2558 case F_MEMBUF: 2559 if (strcmp(list->f_un.f_mb.f_mname, 2560 f->f_un.f_mb.f_mname) == 0 && 2561 progmatches(list->f_program, f->f_program) && 2562 progmatches(list->f_hostname, f->f_hostname)) { 2563 log_debug("duplicate membuf %s", 2564 f->f_un.f_mb.f_mname); 2565 return (list); 2566 } 2567 break; 2568 } 2569 } 2570 return (NULL); 2571 } 2572 2573 /* 2574 * Crack a configuration file line 2575 */ 2576 struct filed * 2577 cfline(char *line, char *progblock, char *hostblock) 2578 { 2579 int i, pri; 2580 size_t rb_len; 2581 char *bp, *p, *q, *proto, *host, *port, *ipproto; 2582 char buf[LOG_MAXLINE]; 2583 struct filed *xf, *f, *d; 2584 struct timeval to; 2585 2586 log_debug("cfline(\"%s\", f, \"%s\", \"%s\")", 2587 line, progblock, hostblock); 2588 2589 if ((f = calloc(1, sizeof(*f))) == NULL) 2590 fatal("allocate struct filed"); 2591 for (i = 0; i <= LOG_NFACILITIES; i++) 2592 f->f_pmask[i] = INTERNAL_NOPRI; 2593 2594 /* save program name if any */ 2595 f->f_quick = 0; 2596 if (*progblock == '!') { 2597 progblock++; 2598 f->f_quick = 1; 2599 } 2600 if (*hostblock == '+') { 2601 hostblock++; 2602 f->f_quick = 1; 2603 } 2604 if (strcmp(progblock, "*") != 0) 2605 f->f_program = strdup(progblock); 2606 if (strcmp(hostblock, "*") != 0) 2607 f->f_hostname = strdup(hostblock); 2608 2609 /* scan through the list of selectors */ 2610 for (p = line; *p && *p != '\t' && *p != ' ';) { 2611 2612 /* find the end of this facility name list */ 2613 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2614 continue; 2615 2616 /* collect priority name */ 2617 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2618 *bp++ = *q++; 2619 *bp = '\0'; 2620 2621 /* skip cruft */ 2622 while (*q && strchr(",;", *q)) 2623 q++; 2624 2625 /* decode priority name */ 2626 if (*buf == '*') 2627 pri = LOG_PRIMASK + 1; 2628 else { 2629 /* ignore trailing spaces */ 2630 for (i=strlen(buf)-1; i >= 0 && buf[i] == ' '; i--) { 2631 buf[i]='\0'; 2632 } 2633 2634 pri = decode(buf, prioritynames); 2635 if (pri < 0) { 2636 log_warnx("unknown priority name \"%s\"", buf); 2637 free(f); 2638 return (NULL); 2639 } 2640 } 2641 2642 /* scan facilities */ 2643 while (*p && !strchr("\t.; ", *p)) { 2644 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2645 *bp++ = *p++; 2646 *bp = '\0'; 2647 if (*buf == '*') 2648 for (i = 0; i < LOG_NFACILITIES; i++) 2649 f->f_pmask[i] = pri; 2650 else { 2651 i = decode(buf, facilitynames); 2652 if (i < 0) { 2653 log_warnx("unknown facility name " 2654 "\"%s\"", buf); 2655 free(f); 2656 return (NULL); 2657 } 2658 f->f_pmask[i >> 3] = pri; 2659 } 2660 while (*p == ',' || *p == ' ') 2661 p++; 2662 } 2663 2664 p = q; 2665 } 2666 2667 /* skip to action part */ 2668 while (*p == '\t' || *p == ' ') 2669 p++; 2670 2671 switch (*p) { 2672 case '@': 2673 if ((strlcpy(f->f_un.f_forw.f_loghost, p, 2674 sizeof(f->f_un.f_forw.f_loghost)) >= 2675 sizeof(f->f_un.f_forw.f_loghost))) { 2676 log_warnx("loghost too long \"%s\"", p); 2677 break; 2678 } 2679 if (loghost_parse(++p, &proto, &host, &port) == -1) { 2680 log_warnx("bad loghost \"%s\"", 2681 f->f_un.f_forw.f_loghost); 2682 break; 2683 } 2684 if (proto == NULL) 2685 proto = "udp"; 2686 ipproto = proto; 2687 if (strcmp(proto, "udp") == 0) { 2688 if (fd_udp == -1) 2689 proto = "udp6"; 2690 if (fd_udp6 == -1) 2691 proto = "udp4"; 2692 ipproto = proto; 2693 } else if (strcmp(proto, "udp4") == 0) { 2694 if (fd_udp == -1) { 2695 log_warnx("no udp4 \"%s\"", 2696 f->f_un.f_forw.f_loghost); 2697 break; 2698 } 2699 } else if (strcmp(proto, "udp6") == 0) { 2700 if (fd_udp6 == -1) { 2701 log_warnx("no udp6 \"%s\"", 2702 f->f_un.f_forw.f_loghost); 2703 break; 2704 } 2705 } else if (strcmp(proto, "tcp") == 0 || 2706 strcmp(proto, "tcp4") == 0 || strcmp(proto, "tcp6") == 0) { 2707 ; 2708 } else if (strcmp(proto, "tls") == 0) { 2709 ipproto = "tcp"; 2710 } else if (strcmp(proto, "tls4") == 0) { 2711 ipproto = "tcp4"; 2712 } else if (strcmp(proto, "tls6") == 0) { 2713 ipproto = "tcp6"; 2714 } else { 2715 log_warnx("bad protocol \"%s\"", 2716 f->f_un.f_forw.f_loghost); 2717 break; 2718 } 2719 if (strlen(host) >= NI_MAXHOST) { 2720 log_warnx("host too long \"%s\"", 2721 f->f_un.f_forw.f_loghost); 2722 break; 2723 } 2724 if (port == NULL) 2725 port = strncmp(proto, "tls", 3) == 0 ? 2726 "syslog-tls" : "syslog"; 2727 if (strlen(port) >= NI_MAXSERV) { 2728 log_warnx("port too long \"%s\"", 2729 f->f_un.f_forw.f_loghost); 2730 break; 2731 } 2732 if (priv_getaddrinfo(ipproto, host, port, 2733 (struct sockaddr*)&f->f_un.f_forw.f_addr, 2734 sizeof(f->f_un.f_forw.f_addr)) != 0) { 2735 log_warnx("bad hostname \"%s\"", 2736 f->f_un.f_forw.f_loghost); 2737 break; 2738 } 2739 f->f_file = -1; 2740 if (strncmp(proto, "udp", 3) == 0) { 2741 switch (f->f_un.f_forw.f_addr.ss_family) { 2742 case AF_INET: 2743 send_udp = 1; 2744 f->f_file = fd_udp; 2745 break; 2746 case AF_INET6: 2747 send_udp6 = 1; 2748 f->f_file = fd_udp6; 2749 break; 2750 } 2751 f->f_type = F_FORWUDP; 2752 } else if (strncmp(ipproto, "tcp", 3) == 0) { 2753 if ((f->f_un.f_forw.f_bufev = bufferevent_new(-1, 2754 tcp_dropcb, tcp_writecb, tcp_errorcb, f)) == NULL) { 2755 log_warn("bufferevent \"%s\"", 2756 f->f_un.f_forw.f_loghost); 2757 break; 2758 } 2759 if (strncmp(proto, "tls", 3) == 0) { 2760 f->f_un.f_forw.f_host = strdup(host); 2761 f->f_type = F_FORWTLS; 2762 } else { 2763 f->f_type = F_FORWTCP; 2764 } 2765 /* 2766 * If we try to connect to a TLS server immediately 2767 * syslogd gets an SIGPIPE as the signal handlers have 2768 * not been set up. Delay the connection until the 2769 * event loop is started. We can reuse the write event 2770 * for that as bufferevent is still disabled. 2771 */ 2772 to.tv_sec = 0; 2773 to.tv_usec = 1; 2774 evtimer_set(&f->f_un.f_forw.f_bufev->ev_write, 2775 tcp_connectcb, f); 2776 evtimer_add(&f->f_un.f_forw.f_bufev->ev_write, &to); 2777 } 2778 break; 2779 2780 case '/': 2781 case '|': 2782 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2783 d = find_dup(f); 2784 if (d != NULL) { 2785 for (i = 0; i <= LOG_NFACILITIES; i++) 2786 if (f->f_pmask[i] != INTERNAL_NOPRI) 2787 d->f_pmask[i] = f->f_pmask[i]; 2788 free(f); 2789 return (NULL); 2790 } 2791 if (strcmp(p, ctty) == 0) { 2792 f->f_file = priv_open_tty(p); 2793 if (f->f_file < 0) 2794 log_warn("priv_open_tty \"%s\"", p); 2795 } else { 2796 f->f_file = priv_open_log(p); 2797 if (f->f_file < 0) 2798 log_warn("priv_open_log \"%s\"", p); 2799 } 2800 if (f->f_file < 0) { 2801 f->f_type = F_UNUSED; 2802 break; 2803 } 2804 if (isatty(f->f_file)) { 2805 if (strcmp(p, ctty) == 0) 2806 f->f_type = F_CONSOLE; 2807 else 2808 f->f_type = F_TTY; 2809 } else { 2810 if (*p == '|') 2811 f->f_type = F_PIPE; 2812 else { 2813 f->f_type = F_FILE; 2814 2815 /* Clear O_NONBLOCK flag on f->f_file */ 2816 if ((i = fcntl(f->f_file, F_GETFL)) != -1) { 2817 i &= ~O_NONBLOCK; 2818 fcntl(f->f_file, F_SETFL, i); 2819 } 2820 } 2821 } 2822 break; 2823 2824 case '*': 2825 f->f_type = F_WALL; 2826 break; 2827 2828 case ':': 2829 f->f_type = F_MEMBUF; 2830 2831 /* Parse buffer size (in kb) */ 2832 errno = 0; 2833 rb_len = strtoul(++p, &q, 0); 2834 if (*p == '\0' || (errno == ERANGE && rb_len == ULONG_MAX) || 2835 *q != ':' || rb_len == 0) { 2836 f->f_type = F_UNUSED; 2837 log_warnx("strtoul \"%s\"", p); 2838 break; 2839 } 2840 q++; 2841 rb_len *= 1024; 2842 2843 /* Copy buffer name */ 2844 for(i = 0; (size_t)i < sizeof(f->f_un.f_mb.f_mname) - 1; i++) { 2845 if (!isalnum((unsigned char)q[i])) 2846 break; 2847 f->f_un.f_mb.f_mname[i] = q[i]; 2848 } 2849 2850 /* Make sure buffer name is unique */ 2851 xf = find_dup(f); 2852 2853 /* Error on missing or non-unique name, or bad buffer length */ 2854 if (i == 0 || rb_len > MAX_MEMBUF || xf != NULL) { 2855 f->f_type = F_UNUSED; 2856 log_warnx("find_dup \"%s\"", p); 2857 break; 2858 } 2859 2860 /* Set buffer length */ 2861 rb_len = MAXIMUM(rb_len, MIN_MEMBUF); 2862 f->f_un.f_mb.f_len = rb_len; 2863 f->f_un.f_mb.f_overflow = 0; 2864 f->f_un.f_mb.f_attached = 0; 2865 break; 2866 2867 default: 2868 for (i = 0; i < MAXUNAMES && *p; i++) { 2869 for (q = p; *q && *q != ','; ) 2870 q++; 2871 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 2872 if ((q - p) > UT_NAMESIZE) 2873 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 2874 else 2875 f->f_un.f_uname[i][q - p] = '\0'; 2876 while (*q == ',' || *q == ' ') 2877 q++; 2878 p = q; 2879 } 2880 f->f_type = F_USERS; 2881 break; 2882 } 2883 return (f); 2884 } 2885 2886 /* 2887 * Parse the host and port parts from a loghost string. 2888 */ 2889 int 2890 loghost_parse(char *str, char **proto, char **host, char **port) 2891 { 2892 char *prefix = NULL; 2893 2894 if ((*host = strchr(str, ':')) && 2895 (*host)[1] == '/' && (*host)[2] == '/') { 2896 prefix = str; 2897 **host = '\0'; 2898 str = *host + 3; 2899 } 2900 if (proto) 2901 *proto = prefix; 2902 else if (prefix) 2903 return (-1); 2904 2905 *host = str; 2906 if (**host == '[') { 2907 (*host)++; 2908 str = strchr(*host, ']'); 2909 if (str == NULL) 2910 return (-1); 2911 *str++ = '\0'; 2912 } 2913 *port = strrchr(str, ':'); 2914 if (*port != NULL) 2915 *(*port)++ = '\0'; 2916 2917 return (0); 2918 } 2919 2920 /* 2921 * Retrieve the size of the kernel message buffer, via sysctl. 2922 */ 2923 int 2924 getmsgbufsize(void) 2925 { 2926 int msgbufsize, mib[2]; 2927 size_t size; 2928 2929 mib[0] = CTL_KERN; 2930 mib[1] = KERN_MSGBUFSIZE; 2931 size = sizeof msgbufsize; 2932 if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) { 2933 log_debug("couldn't get kern.msgbufsize"); 2934 return (0); 2935 } 2936 return (msgbufsize); 2937 } 2938 2939 /* 2940 * Decode a symbolic name to a numeric value 2941 */ 2942 int 2943 decode(const char *name, const CODE *codetab) 2944 { 2945 const CODE *c; 2946 char *p, buf[40]; 2947 2948 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2949 if (isupper((unsigned char)*name)) 2950 *p = tolower((unsigned char)*name); 2951 else 2952 *p = *name; 2953 } 2954 *p = '\0'; 2955 for (c = codetab; c->c_name; c++) 2956 if (!strcmp(buf, c->c_name)) 2957 return (c->c_val); 2958 2959 return (-1); 2960 } 2961 2962 void 2963 markit(void) 2964 { 2965 struct filed *f; 2966 2967 (void)gettimeofday(&now, NULL); 2968 MarkSeq += TIMERINTVL; 2969 if (MarkSeq >= MarkInterval) { 2970 logline(LOG_INFO, ADDDATE|MARK, LocalHostName, "-- MARK --"); 2971 MarkSeq = 0; 2972 } 2973 2974 SIMPLEQ_FOREACH(f, &Files, f_next) { 2975 if (f->f_prevcount && now.tv_sec >= REPEATTIME(f)) { 2976 log_debug("flush %s: repeated %d times, %d sec", 2977 TypeNames[f->f_type], f->f_prevcount, 2978 repeatinterval[f->f_repeatcount]); 2979 fprintlog(f, 0, (char *)NULL); 2980 BACKOFF(f); 2981 } 2982 } 2983 } 2984 2985 int 2986 unix_socket(char *path, int type, mode_t mode) 2987 { 2988 struct sockaddr_un s_un; 2989 int fd, optval; 2990 mode_t old_umask; 2991 2992 memset(&s_un, 0, sizeof(s_un)); 2993 s_un.sun_family = AF_UNIX; 2994 if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >= 2995 sizeof(s_un.sun_path)) { 2996 log_warnx("socket path too long \"%s\"", path); 2997 return (-1); 2998 } 2999 3000 if ((fd = socket(AF_UNIX, type, 0)) == -1) { 3001 log_warn("socket unix \"%s\"", path); 3002 return (-1); 3003 } 3004 3005 if (Debug) { 3006 if (connect(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == 0 || 3007 errno == EPROTOTYPE) { 3008 close(fd); 3009 errno = EISCONN; 3010 log_warn("connect unix \"%s\"", path); 3011 return (-1); 3012 } 3013 } 3014 3015 old_umask = umask(0177); 3016 3017 unlink(path); 3018 if (bind(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) { 3019 log_warn("bind unix \"%s\"", path); 3020 umask(old_umask); 3021 close(fd); 3022 return (-1); 3023 } 3024 3025 umask(old_umask); 3026 3027 if (chmod(path, mode) == -1) { 3028 log_warn("chmod unix \"%s\"", path); 3029 close(fd); 3030 unlink(path); 3031 return (-1); 3032 } 3033 3034 optval = LOG_MAXLINE + PATH_MAX; 3035 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &optval, sizeof(optval)) 3036 == -1) 3037 log_warn("setsockopt unix \"%s\"", path); 3038 3039 return (fd); 3040 } 3041 3042 /* 3043 * Increase socket buffer size in small steps to get partial success 3044 * if we hit a kernel limit. Allow an optional final step. 3045 */ 3046 void 3047 double_sockbuf(int fd, int optname, int bigsize) 3048 { 3049 socklen_t len; 3050 int i, newsize, oldsize = 0; 3051 3052 len = sizeof(oldsize); 3053 if (getsockopt(fd, SOL_SOCKET, optname, &oldsize, &len) == -1) 3054 log_warn("getsockopt bufsize"); 3055 len = sizeof(newsize); 3056 newsize = LOG_MAXLINE + 128; /* data + control */ 3057 /* allow 8 full length messages, that is 66560 bytes */ 3058 for (i = 0; i < 4; i++, newsize *= 2) { 3059 if (newsize <= oldsize) 3060 continue; 3061 if (setsockopt(fd, SOL_SOCKET, optname, &newsize, len) == -1) 3062 log_warn("setsockopt bufsize %d", newsize); 3063 else 3064 oldsize = newsize; 3065 } 3066 if (bigsize && bigsize > oldsize) { 3067 if (setsockopt(fd, SOL_SOCKET, optname, &bigsize, len) == -1) 3068 log_warn("setsockopt bufsize %d", bigsize); 3069 } 3070 } 3071 3072 void 3073 set_sockbuf(int fd) 3074 { 3075 int size = 65536; 3076 3077 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) == -1) 3078 log_warn("setsockopt sndbufsize %d", size); 3079 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)) == -1) 3080 log_warn("setsockopt rcvbufsize %d", size); 3081 } 3082 3083 void 3084 ctlconn_cleanup(void) 3085 { 3086 struct filed *f; 3087 3088 close(fd_ctlconn); 3089 fd_ctlconn = -1; 3090 event_del(ev_ctlread); 3091 event_del(ev_ctlwrite); 3092 event_add(ev_ctlaccept, NULL); 3093 3094 if (ctl_state == CTL_WRITING_CONT_REPLY) 3095 SIMPLEQ_FOREACH(f, &Files, f_next) 3096 if (f->f_type == F_MEMBUF) 3097 f->f_un.f_mb.f_attached = 0; 3098 3099 ctl_state = ctl_cmd_bytes = ctl_reply_offset = ctl_reply_size = 0; 3100 } 3101 3102 void 3103 ctlsock_acceptcb(int fd, short event, void *arg) 3104 { 3105 struct event *ev = arg; 3106 3107 if ((fd = reserve_accept4(fd, event, ev, ctlsock_acceptcb, 3108 NULL, NULL, SOCK_NONBLOCK)) == -1) { 3109 if (errno != ENFILE && errno != EMFILE && 3110 errno != EINTR && errno != EWOULDBLOCK && 3111 errno != ECONNABORTED) 3112 log_warn("accept control socket"); 3113 return; 3114 } 3115 log_debug("Accepting control connection"); 3116 3117 if (fd_ctlconn != -1) 3118 ctlconn_cleanup(); 3119 3120 /* Only one connection at a time */ 3121 event_del(ev); 3122 3123 fd_ctlconn = fd; 3124 /* file descriptor has changed, reset event */ 3125 event_set(ev_ctlread, fd_ctlconn, EV_READ|EV_PERSIST, 3126 ctlconn_readcb, ev_ctlread); 3127 event_set(ev_ctlwrite, fd_ctlconn, EV_WRITE|EV_PERSIST, 3128 ctlconn_writecb, ev_ctlwrite); 3129 event_add(ev_ctlread, NULL); 3130 ctl_state = CTL_READING_CMD; 3131 ctl_cmd_bytes = 0; 3132 } 3133 3134 static struct filed 3135 *find_membuf_log(const char *name) 3136 { 3137 struct filed *f; 3138 3139 SIMPLEQ_FOREACH(f, &Files, f_next) { 3140 if (f->f_type == F_MEMBUF && 3141 strcmp(f->f_un.f_mb.f_mname, name) == 0) 3142 break; 3143 } 3144 return (f); 3145 } 3146 3147 void 3148 ctlconn_readcb(int fd, short event, void *arg) 3149 { 3150 struct filed *f; 3151 struct ctl_reply_hdr *reply_hdr = (struct ctl_reply_hdr *)ctl_reply; 3152 ssize_t n; 3153 u_int32_t flags = 0; 3154 3155 if (ctl_state == CTL_WRITING_REPLY || 3156 ctl_state == CTL_WRITING_CONT_REPLY) { 3157 /* client has closed the connection */ 3158 ctlconn_cleanup(); 3159 return; 3160 } 3161 3162 retry: 3163 n = read(fd, (char*)&ctl_cmd + ctl_cmd_bytes, 3164 sizeof(ctl_cmd) - ctl_cmd_bytes); 3165 switch (n) { 3166 case -1: 3167 if (errno == EINTR) 3168 goto retry; 3169 if (errno == EWOULDBLOCK) 3170 return; 3171 log_warn("read control socket"); 3172 /* FALLTHROUGH */ 3173 case 0: 3174 ctlconn_cleanup(); 3175 return; 3176 default: 3177 ctl_cmd_bytes += n; 3178 } 3179 if (ctl_cmd_bytes < sizeof(ctl_cmd)) 3180 return; 3181 3182 if (ntohl(ctl_cmd.version) != CTL_VERSION) { 3183 log_warnx("unknown client protocol version"); 3184 ctlconn_cleanup(); 3185 return; 3186 } 3187 3188 /* Ensure that logname is \0 terminated */ 3189 if (memchr(ctl_cmd.logname, '\0', sizeof(ctl_cmd.logname)) == NULL) { 3190 log_warnx("corrupt control socket command"); 3191 ctlconn_cleanup(); 3192 return; 3193 } 3194 3195 *reply_text = '\0'; 3196 3197 ctl_reply_size = ctl_reply_offset = 0; 3198 memset(reply_hdr, '\0', sizeof(*reply_hdr)); 3199 3200 ctl_cmd.cmd = ntohl(ctl_cmd.cmd); 3201 log_debug("ctlcmd %x logname \"%s\"", ctl_cmd.cmd, ctl_cmd.logname); 3202 3203 switch (ctl_cmd.cmd) { 3204 case CMD_READ: 3205 case CMD_READ_CLEAR: 3206 case CMD_READ_CONT: 3207 case CMD_FLAGS: 3208 f = find_membuf_log(ctl_cmd.logname); 3209 if (f == NULL) { 3210 strlcpy(reply_text, "No such log\n", MAX_MEMBUF); 3211 } else { 3212 if (ctl_cmd.cmd != CMD_FLAGS) { 3213 ringbuf_to_string(reply_text, MAX_MEMBUF, 3214 f->f_un.f_mb.f_rb); 3215 } 3216 if (f->f_un.f_mb.f_overflow) 3217 flags |= CTL_HDR_FLAG_OVERFLOW; 3218 if (ctl_cmd.cmd == CMD_READ_CLEAR) { 3219 ringbuf_clear(f->f_un.f_mb.f_rb); 3220 f->f_un.f_mb.f_overflow = 0; 3221 } 3222 if (ctl_cmd.cmd == CMD_READ_CONT) { 3223 f->f_un.f_mb.f_attached = 1; 3224 tailify_replytext(reply_text, 3225 ctl_cmd.lines > 0 ? ctl_cmd.lines : 10); 3226 } else if (ctl_cmd.lines > 0) { 3227 tailify_replytext(reply_text, ctl_cmd.lines); 3228 } 3229 } 3230 break; 3231 case CMD_CLEAR: 3232 f = find_membuf_log(ctl_cmd.logname); 3233 if (f == NULL) { 3234 strlcpy(reply_text, "No such log\n", MAX_MEMBUF); 3235 } else { 3236 ringbuf_clear(f->f_un.f_mb.f_rb); 3237 if (f->f_un.f_mb.f_overflow) 3238 flags |= CTL_HDR_FLAG_OVERFLOW; 3239 f->f_un.f_mb.f_overflow = 0; 3240 strlcpy(reply_text, "Log cleared\n", MAX_MEMBUF); 3241 } 3242 break; 3243 case CMD_LIST: 3244 SIMPLEQ_FOREACH(f, &Files, f_next) { 3245 if (f->f_type == F_MEMBUF) { 3246 strlcat(reply_text, f->f_un.f_mb.f_mname, 3247 MAX_MEMBUF); 3248 if (f->f_un.f_mb.f_overflow) { 3249 strlcat(reply_text, "*", MAX_MEMBUF); 3250 flags |= CTL_HDR_FLAG_OVERFLOW; 3251 } 3252 strlcat(reply_text, " ", MAX_MEMBUF); 3253 } 3254 } 3255 strlcat(reply_text, "\n", MAX_MEMBUF); 3256 break; 3257 default: 3258 log_warnx("unsupported control socket command"); 3259 ctlconn_cleanup(); 3260 return; 3261 } 3262 reply_hdr->version = htonl(CTL_VERSION); 3263 reply_hdr->flags = htonl(flags); 3264 3265 ctl_reply_size = CTL_REPLY_SIZE; 3266 log_debug("ctlcmd reply length %lu", (u_long)ctl_reply_size); 3267 3268 /* Otherwise, set up to write out reply */ 3269 ctl_state = (ctl_cmd.cmd == CMD_READ_CONT) ? 3270 CTL_WRITING_CONT_REPLY : CTL_WRITING_REPLY; 3271 3272 event_add(ev_ctlwrite, NULL); 3273 3274 /* another syslogc can kick us out */ 3275 if (ctl_state == CTL_WRITING_CONT_REPLY) 3276 event_add(ev_ctlaccept, NULL); 3277 } 3278 3279 void 3280 ctlconn_writecb(int fd, short event, void *arg) 3281 { 3282 struct event *ev = arg; 3283 ssize_t n; 3284 3285 if (!(ctl_state == CTL_WRITING_REPLY || 3286 ctl_state == CTL_WRITING_CONT_REPLY)) { 3287 /* Shouldn't be here! */ 3288 log_warnx("control socket write with bad state"); 3289 ctlconn_cleanup(); 3290 return; 3291 } 3292 3293 retry: 3294 n = write(fd, ctl_reply + ctl_reply_offset, 3295 ctl_reply_size - ctl_reply_offset); 3296 switch (n) { 3297 case -1: 3298 if (errno == EINTR) 3299 goto retry; 3300 if (errno == EWOULDBLOCK) 3301 return; 3302 if (errno != EPIPE) 3303 log_warn("write control socket"); 3304 /* FALLTHROUGH */ 3305 case 0: 3306 ctlconn_cleanup(); 3307 return; 3308 default: 3309 ctl_reply_offset += n; 3310 } 3311 if (ctl_reply_offset < ctl_reply_size) 3312 return; 3313 3314 if (ctl_state != CTL_WRITING_CONT_REPLY) { 3315 ctlconn_cleanup(); 3316 return; 3317 } 3318 3319 /* 3320 * Make space in the buffer for continous writes. 3321 * Set offset behind reply header to skip it 3322 */ 3323 *reply_text = '\0'; 3324 ctl_reply_offset = ctl_reply_size = CTL_REPLY_SIZE; 3325 3326 /* Now is a good time to report dropped lines */ 3327 if (membuf_drop) { 3328 strlcat(reply_text, "<ENOBUFS>\n", MAX_MEMBUF); 3329 ctl_reply_size = CTL_REPLY_SIZE; 3330 membuf_drop = 0; 3331 } else { 3332 /* Nothing left to write */ 3333 event_del(ev); 3334 } 3335 } 3336 3337 /* Shorten replytext to number of lines */ 3338 void 3339 tailify_replytext(char *replytext, int lines) 3340 { 3341 char *start, *nl; 3342 int count = 0; 3343 start = nl = replytext; 3344 3345 while ((nl = strchr(nl, '\n')) != NULL) { 3346 nl++; 3347 if (++count > lines) { 3348 start = strchr(start, '\n'); 3349 start++; 3350 } 3351 } 3352 if (start != replytext) { 3353 int len = strlen(start); 3354 memmove(replytext, start, len); 3355 *(replytext + len) = '\0'; 3356 } 3357 } 3358 3359 void 3360 ctlconn_logto(char *line) 3361 { 3362 size_t l; 3363 3364 if (membuf_drop) 3365 return; 3366 3367 l = strlen(line); 3368 if (l + 2 > (CTL_REPLY_MAXSIZE - ctl_reply_size)) { 3369 /* remember line drops for later report */ 3370 membuf_drop = 1; 3371 return; 3372 } 3373 memcpy(ctl_reply + ctl_reply_size, line, l); 3374 memcpy(ctl_reply + ctl_reply_size + l, "\n", 2); 3375 ctl_reply_size += l + 1; 3376 event_add(ev_ctlwrite, NULL); 3377 } 3378