1 /* $OpenBSD: syslogd.c,v 1.244 2017/04/28 14:52:13 bluhm Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * syslogd -- log system messages 34 * 35 * This program implements a system log. It takes a series of lines. 36 * Each line may have a priority, signified as "<n>" as 37 * the first characters of the line. If this is 38 * not present, a default priority is used. 39 * 40 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 41 * cause it to reread its configuration file. 42 * 43 * Defined Constants: 44 * 45 * MAXLINE -- the maximum line length that can be handled. 46 * DEFUPRI -- the default priority for user messages 47 * DEFSPRI -- the default priority for kernel messages 48 * 49 * Author: Eric Allman 50 * extensive changes by Ralph Campbell 51 * more extensive changes by Eric Allman (again) 52 * memory buffer logging by Damien Miller 53 * IPv6, libevent, syslog over TCP and TLS by Alexander Bluhm 54 */ 55 56 #define MAX_UDPMSG 1180 /* maximum UDP send size */ 57 #define MIN_MEMBUF (MAXLINE * 4) /* Minimum memory buffer size */ 58 #define MAX_MEMBUF (256 * 1024) /* Maximum memory buffer size */ 59 #define MAX_MEMBUF_NAME 64 /* Max length of membuf log name */ 60 #define MAX_TCPBUF (256 * 1024) /* Maximum tcp event buffer size */ 61 #define MAXSVLINE 120 /* maximum saved line length */ 62 #define FD_RESERVE 5 /* file descriptors not accepted */ 63 #define DEFUPRI (LOG_USER|LOG_NOTICE) 64 #define DEFSPRI (LOG_KERN|LOG_CRIT) 65 #define TIMERINTVL 30 /* interval for checking flush, mark */ 66 67 #include <sys/ioctl.h> 68 #include <sys/stat.h> 69 #include <sys/msgbuf.h> 70 #include <sys/queue.h> 71 #include <sys/sysctl.h> 72 #include <sys/un.h> 73 #include <sys/time.h> 74 #include <sys/resource.h> 75 76 #include <netinet/in.h> 77 #include <netdb.h> 78 #include <arpa/inet.h> 79 80 #include <ctype.h> 81 #include <err.h> 82 #include <errno.h> 83 #include <event.h> 84 #include <fcntl.h> 85 #include <limits.h> 86 #include <paths.h> 87 #include <signal.h> 88 #include <stdio.h> 89 #include <stdlib.h> 90 #include <string.h> 91 #include <tls.h> 92 #include <unistd.h> 93 #include <utmp.h> 94 #include <vis.h> 95 96 #define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b)) 97 #define MINIMUM(a, b) (((a) < (b)) ? (a) : (b)) 98 99 #define SYSLOG_NAMES 100 #include <sys/syslog.h> 101 102 #include "log.h" 103 #include "syslogd.h" 104 #include "evbuffer_tls.h" 105 106 char *ConfFile = _PATH_LOGCONF; 107 const char ctty[] = _PATH_CONSOLE; 108 109 #define MAXUNAMES 20 /* maximum number of user names */ 110 111 112 /* 113 * Flags to logline(). 114 */ 115 116 #define IGN_CONS 0x001 /* don't print on console */ 117 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 118 #define ADDDATE 0x004 /* add a date to the message */ 119 #define MARK 0x008 /* this message is a mark */ 120 121 /* 122 * This structure represents the files that will have log 123 * copies printed. 124 */ 125 126 struct filed { 127 SIMPLEQ_ENTRY(filed) f_next; /* next in linked list */ 128 int f_type; /* entry type, see below */ 129 int f_file; /* file descriptor */ 130 time_t f_time; /* time this was last written */ 131 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 132 char *f_program; /* program this applies to */ 133 char *f_hostname; /* host this applies to */ 134 union { 135 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 136 struct { 137 char f_loghost[1+4+3+1+NI_MAXHOST+1+NI_MAXSERV]; 138 /* @proto46://[hostname]:servname\0 */ 139 struct sockaddr_storage f_addr; 140 struct buffertls f_buftls; 141 struct bufferevent *f_bufev; 142 struct tls *f_ctx; 143 char *f_host; 144 int f_reconnectwait; 145 int f_dropped; 146 } f_forw; /* forwarding address */ 147 char f_fname[PATH_MAX]; 148 struct { 149 char f_mname[MAX_MEMBUF_NAME]; 150 struct ringbuf *f_rb; 151 int f_overflow; 152 int f_attached; 153 size_t f_len; 154 } f_mb; /* Memory buffer */ 155 } f_un; 156 char f_prevline[MAXSVLINE]; /* last message logged */ 157 char f_lasttime[33]; /* time of last occurrence */ 158 char f_prevhost[HOST_NAME_MAX+1]; /* host from which recd. */ 159 int f_prevpri; /* pri of f_prevline */ 160 int f_prevlen; /* length of f_prevline */ 161 int f_prevcount; /* repetition cnt of prevline */ 162 unsigned int f_repeatcount; /* number of "repeated" msgs */ 163 int f_quick; /* abort when matched */ 164 time_t f_lasterrtime; /* last error was reported */ 165 }; 166 167 /* 168 * Intervals at which we flush out "message repeated" messages, 169 * in seconds after previous message is logged. After each flush, 170 * we move to the next interval until we reach the largest. 171 */ 172 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 173 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 174 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 175 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 176 (f)->f_repeatcount = MAXREPEAT; \ 177 } 178 179 /* values for f_type */ 180 #define F_UNUSED 0 /* unused entry */ 181 #define F_FILE 1 /* regular file */ 182 #define F_TTY 2 /* terminal */ 183 #define F_CONSOLE 3 /* console terminal */ 184 #define F_FORWUDP 4 /* remote machine via UDP */ 185 #define F_USERS 5 /* list of users */ 186 #define F_WALL 6 /* everyone logged on */ 187 #define F_MEMBUF 7 /* memory buffer */ 188 #define F_PIPE 8 /* pipe to external program */ 189 #define F_FORWTCP 9 /* remote machine via TCP */ 190 #define F_FORWTLS 10 /* remote machine via TLS */ 191 192 char *TypeNames[] = { 193 "UNUSED", "FILE", "TTY", "CONSOLE", 194 "FORWUDP", "USERS", "WALL", "MEMBUF", 195 "PIPE", "FORWTCP", "FORWTLS", 196 }; 197 198 SIMPLEQ_HEAD(filed_list, filed) Files; 199 struct filed consfile; 200 201 int nunix; /* Number of Unix domain sockets requested */ 202 char **path_unix; /* Paths to Unix domain sockets */ 203 int Debug; /* debug flag */ 204 int Foreground; /* run in foreground, instead of daemonizing */ 205 char LocalHostName[HOST_NAME_MAX+1]; /* our hostname */ 206 char *LocalDomain; /* our local domain name */ 207 int Started = 0; /* set after privsep */ 208 int Initialized = 0; /* set when we have initialized ourselves */ 209 210 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 211 int MarkSeq = 0; /* mark sequence number */ 212 int PrivChild = 0; /* Exec the privileged parent process */ 213 int Repeat = 0; /* 0 msg repeated, 1 in files only, 2 never */ 214 int SecureMode = 1; /* when true, speak only unix domain socks */ 215 int NoDNS = 0; /* when true, refrain from doing DNS lookups */ 216 int ZuluTime = 0; /* display date and time in UTC ISO format */ 217 int IncludeHostname = 0; /* include RFC 3164 hostnames when forwarding */ 218 int Family = PF_UNSPEC; /* protocol family, may disable IPv4 or IPv6 */ 219 char *path_ctlsock = NULL; /* Path to control socket */ 220 221 struct tls *server_ctx; 222 struct tls_config *client_config, *server_config; 223 const char *CAfile = "/etc/ssl/cert.pem"; /* file containing CA certificates */ 224 int NoVerify = 0; /* do not verify TLS server x509 certificate */ 225 const char *ClientCertfile = NULL; 226 const char *ClientKeyfile = NULL; 227 const char *ServerCAfile = NULL; 228 int tcpbuf_dropped = 0; /* count messages dropped from TCP or TLS */ 229 230 #define CTL_READING_CMD 1 231 #define CTL_WRITING_REPLY 2 232 #define CTL_WRITING_CONT_REPLY 3 233 int ctl_state = 0; /* What the control socket is up to */ 234 int membuf_drop = 0; /* logs dropped in continuous membuf read */ 235 236 /* 237 * Client protocol NB. all numeric fields in network byte order 238 */ 239 #define CTL_VERSION 2 240 241 /* Request */ 242 struct { 243 u_int32_t version; 244 #define CMD_READ 1 /* Read out log */ 245 #define CMD_READ_CLEAR 2 /* Read and clear log */ 246 #define CMD_CLEAR 3 /* Clear log */ 247 #define CMD_LIST 4 /* List available logs */ 248 #define CMD_FLAGS 5 /* Query flags only */ 249 #define CMD_READ_CONT 6 /* Read out log continuously */ 250 u_int32_t cmd; 251 u_int32_t lines; 252 char logname[MAX_MEMBUF_NAME]; 253 } ctl_cmd; 254 255 size_t ctl_cmd_bytes = 0; /* number of bytes of ctl_cmd read */ 256 257 /* Reply */ 258 struct ctl_reply_hdr { 259 u_int32_t version; 260 #define CTL_HDR_FLAG_OVERFLOW 0x01 261 u_int32_t flags; 262 /* Reply text follows, up to MAX_MEMBUF long */ 263 }; 264 265 #define CTL_HDR_LEN (sizeof(struct ctl_reply_hdr)) 266 #define CTL_REPLY_MAXSIZE (CTL_HDR_LEN + MAX_MEMBUF) 267 #define CTL_REPLY_SIZE (strlen(reply_text) + CTL_HDR_LEN) 268 269 char *ctl_reply = NULL; /* Buffer for control connection reply */ 270 char *reply_text; /* Start of reply text in buffer */ 271 size_t ctl_reply_size = 0; /* Number of bytes used in reply */ 272 size_t ctl_reply_offset = 0; /* Number of bytes of reply written so far */ 273 274 char *linebuf; 275 int linesize; 276 277 int fd_ctlconn, fd_udp, fd_udp6; 278 struct event *ev_ctlaccept, *ev_ctlread, *ev_ctlwrite; 279 280 struct peer { 281 struct buffertls p_buftls; 282 struct bufferevent *p_bufev; 283 struct tls *p_ctx; 284 char *p_peername; 285 char *p_hostname; 286 int p_fd; 287 }; 288 char hostname_unknown[] = "???"; 289 290 void klog_readcb(int, short, void *); 291 void udp_readcb(int, short, void *); 292 void unix_readcb(int, short, void *); 293 int reserve_accept4(int, int, struct event *, 294 void (*)(int, short, void *), struct sockaddr *, socklen_t *, int); 295 void tcp_acceptcb(int, short, void *); 296 void tls_acceptcb(int, short, void *); 297 void acceptcb(int, short, void *, int); 298 int octet_counting(struct evbuffer *, char **, int); 299 int non_transparent_framing(struct evbuffer *, char **); 300 void tcp_readcb(struct bufferevent *, void *); 301 void tcp_closecb(struct bufferevent *, short, void *); 302 int tcp_socket(struct filed *); 303 void tcp_dropcb(struct bufferevent *, void *); 304 void tcp_writecb(struct bufferevent *, void *); 305 void tcp_errorcb(struct bufferevent *, short, void *); 306 void tcp_connectcb(int, short, void *); 307 void tcp_connect_retry(struct bufferevent *, struct filed *); 308 int tcpbuf_countmsg(struct bufferevent *bufev); 309 void die_signalcb(int, short, void *); 310 void mark_timercb(int, short, void *); 311 void init_signalcb(int, short, void *); 312 void ctlsock_acceptcb(int, short, void *); 313 void ctlconn_readcb(int, short, void *); 314 void ctlconn_writecb(int, short, void *); 315 void ctlconn_logto(char *); 316 void ctlconn_cleanup(void); 317 318 struct filed *cfline(char *, char *, char *); 319 void cvthname(struct sockaddr *, char *, size_t); 320 int decode(const char *, const CODE *); 321 void markit(void); 322 void fprintlog(struct filed *, int, char *); 323 void init(void); 324 void logevent(int, const char *); 325 void logline(int, int, char *, char *); 326 struct filed *find_dup(struct filed *); 327 size_t parsepriority(const char *, int *); 328 void printline(char *, char *); 329 void printsys(char *); 330 void usage(void); 331 void wallmsg(struct filed *, struct iovec *); 332 int loghost_parse(char *, char **, char **, char **); 333 int getmsgbufsize(void); 334 void address_alloc(const char *, const char *, char ***, char ***, int *); 335 int socket_bind(const char *, const char *, const char *, int, 336 int *, int *); 337 int unix_socket(char *, int, mode_t); 338 void double_sockbuf(int, int); 339 void set_sockbuf(int); 340 void tailify_replytext(char *, int); 341 342 int 343 main(int argc, char *argv[]) 344 { 345 struct timeval to; 346 struct event *ev_klog, *ev_sendsys, *ev_udp, *ev_udp6, 347 *ev_bind, *ev_listen, *ev_tls, *ev_unix, 348 *ev_hup, *ev_int, *ev_quit, *ev_term, *ev_mark; 349 sigset_t sigmask; 350 const char *errstr; 351 char *p; 352 int ch, i; 353 int lockpipe[2] = { -1, -1}, pair[2], nullfd, fd; 354 int fd_ctlsock, fd_klog, fd_sendsys, *fd_bind, *fd_listen; 355 int *fd_tls, *fd_unix, nbind, nlisten, ntls; 356 char **bind_host, **bind_port, **listen_host, **listen_port; 357 char *tls_hostport, **tls_host, **tls_port; 358 359 /* block signal until handler is set up */ 360 sigemptyset(&sigmask); 361 sigaddset(&sigmask, SIGHUP); 362 if (sigprocmask(SIG_SETMASK, &sigmask, NULL) == -1) 363 err(1, "sigprocmask block"); 364 365 if ((path_unix = malloc(sizeof(*path_unix))) == NULL) 366 err(1, "malloc %s", _PATH_LOG); 367 path_unix[0] = _PATH_LOG; 368 nunix = 1; 369 370 bind_host = listen_host = tls_host = NULL; 371 bind_port = listen_port = tls_port = NULL; 372 tls_hostport = NULL; 373 nbind = nlisten = ntls = 0; 374 375 while ((ch = getopt(argc, argv, 376 "46a:C:c:dFf:hK:k:m:nP:p:rS:s:T:U:uVZ")) != -1) { 377 switch (ch) { 378 case '4': /* disable IPv6 */ 379 Family = PF_INET; 380 break; 381 case '6': /* disable IPv4 */ 382 Family = PF_INET6; 383 break; 384 case 'a': 385 if ((path_unix = reallocarray(path_unix, nunix + 1, 386 sizeof(*path_unix))) == NULL) 387 err(1, "unix path %s", optarg); 388 path_unix[nunix++] = optarg; 389 break; 390 case 'C': /* file containing CA certificates */ 391 CAfile = optarg; 392 break; 393 case 'c': /* file containing client certificate */ 394 ClientCertfile = optarg; 395 break; 396 case 'd': /* debug */ 397 Debug++; 398 break; 399 case 'F': /* foreground */ 400 Foreground = 1; 401 break; 402 case 'f': /* configuration file */ 403 ConfFile = optarg; 404 break; 405 case 'h': /* RFC 3164 hostnames */ 406 IncludeHostname = 1; 407 break; 408 case 'K': /* verify client with CA file */ 409 ServerCAfile = optarg; 410 break; 411 case 'k': /* file containing client key */ 412 ClientKeyfile = optarg; 413 break; 414 case 'm': /* mark interval */ 415 MarkInterval = strtonum(optarg, 0, 365*24*60, &errstr); 416 if (errstr) 417 errx(1, "mark_interval %s: %s", errstr, optarg); 418 MarkInterval *= 60; 419 break; 420 case 'n': /* don't do DNS lookups */ 421 NoDNS = 1; 422 break; 423 case 'P': /* used internally, exec the parent */ 424 PrivChild = strtonum(optarg, 2, INT_MAX, &errstr); 425 if (errstr) 426 errx(1, "priv child %s: %s", errstr, optarg); 427 break; 428 case 'p': /* path */ 429 path_unix[0] = optarg; 430 break; 431 case 'r': 432 Repeat++; 433 break; 434 case 'S': /* allow tls and listen on address */ 435 if (tls_hostport == NULL) 436 tls_hostport = optarg; 437 address_alloc("tls", optarg, &tls_host, &tls_port, 438 &ntls); 439 break; 440 case 's': 441 path_ctlsock = optarg; 442 break; 443 case 'T': /* allow tcp and listen on address */ 444 address_alloc("listen", optarg, &listen_host, 445 &listen_port, &nlisten); 446 break; 447 case 'U': /* allow udp only from address */ 448 address_alloc("bind", optarg, &bind_host, &bind_port, 449 &nbind); 450 break; 451 case 'u': /* allow udp input port */ 452 SecureMode = 0; 453 break; 454 case 'V': /* do not verify certificates */ 455 NoVerify = 1; 456 break; 457 case 'Z': /* time stamps in UTC ISO format */ 458 ZuluTime = 1; 459 break; 460 default: 461 usage(); 462 } 463 } 464 if (argc != optind) 465 usage(); 466 467 log_init(Debug, LOG_SYSLOG); 468 log_procinit("syslogd"); 469 if (Debug) 470 setvbuf(stdout, NULL, _IOLBF, 0); 471 472 if ((nullfd = open(_PATH_DEVNULL, O_RDWR)) == -1) 473 fatal("open %s", _PATH_DEVNULL); 474 for (fd = nullfd + 1; fd <= STDERR_FILENO; fd++) { 475 if (fcntl(fd, F_GETFL) == -1 && errno == EBADF) 476 if (dup2(nullfd, fd) == -1) 477 fatal("dup2 null"); 478 } 479 480 if (PrivChild > 1) 481 priv_exec(ConfFile, NoDNS, PrivChild, argc, argv); 482 483 consfile.f_type = F_CONSOLE; 484 (void)strlcpy(consfile.f_un.f_fname, ctty, 485 sizeof(consfile.f_un.f_fname)); 486 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 487 if ((p = strchr(LocalHostName, '.')) != NULL) { 488 *p++ = '\0'; 489 LocalDomain = p; 490 } else 491 LocalDomain = ""; 492 493 /* Reserve space for kernel message buffer plus buffer full message. */ 494 linesize = getmsgbufsize() + 64; 495 if (linesize < MAXLINE) 496 linesize = MAXLINE; 497 linesize++; 498 if ((linebuf = malloc(linesize)) == NULL) 499 fatal("allocate line buffer"); 500 501 if (socket_bind("udp", NULL, "syslog", SecureMode, 502 &fd_udp, &fd_udp6) == -1) 503 log_warnx("socket bind * failed"); 504 if ((fd_bind = reallocarray(NULL, nbind, sizeof(*fd_bind))) == NULL) 505 fatal("allocate bind fd"); 506 for (i = 0; i < nbind; i++) { 507 if (socket_bind("udp", bind_host[i], bind_port[i], 0, 508 &fd_bind[i], &fd_bind[i]) == -1) 509 log_warnx("socket bind udp failed"); 510 } 511 if ((fd_listen = reallocarray(NULL, nlisten, sizeof(*fd_listen))) 512 == NULL) 513 fatal("allocate listen fd"); 514 for (i = 0; i < nlisten; i++) { 515 if (socket_bind("tcp", listen_host[i], listen_port[i], 0, 516 &fd_listen[i], &fd_listen[i]) == -1) 517 log_warnx("socket listen tcp failed"); 518 } 519 if ((fd_tls = reallocarray(NULL, ntls, sizeof(*fd_tls))) == NULL) 520 fatal("allocate tls fd"); 521 for (i = 0; i < ntls; i++) { 522 if (socket_bind("tls", tls_host[i], tls_port[i], 0, 523 &fd_tls[i], &fd_tls[i]) == -1) 524 log_warnx("socket listen tls failed"); 525 } 526 527 if ((fd_unix = reallocarray(NULL, nunix, sizeof(*fd_unix))) == NULL) 528 fatal("allocate unix fd"); 529 for (i = 0; i < nunix; i++) { 530 fd_unix[i] = unix_socket(path_unix[i], SOCK_DGRAM, 0666); 531 if (fd_unix[i] == -1) { 532 if (i == 0) 533 log_warnx("log socket %s failed", path_unix[i]); 534 continue; 535 } 536 double_sockbuf(fd_unix[i], SO_RCVBUF); 537 } 538 539 if (socketpair(AF_UNIX, SOCK_DGRAM, PF_UNSPEC, pair) == -1) { 540 log_warn("socketpair sendsyslog"); 541 fd_sendsys = -1; 542 } else { 543 double_sockbuf(pair[0], SO_RCVBUF); 544 double_sockbuf(pair[1], SO_SNDBUF); 545 fd_sendsys = pair[0]; 546 } 547 548 fd_ctlsock = fd_ctlconn = -1; 549 if (path_ctlsock != NULL) { 550 fd_ctlsock = unix_socket(path_ctlsock, SOCK_STREAM, 0600); 551 if (fd_ctlsock == -1) { 552 log_warnx("control socket %s failed", path_ctlsock); 553 } else { 554 if (listen(fd_ctlsock, 5) == -1) { 555 log_warn("listen control socket"); 556 close(fd_ctlsock); 557 fd_ctlsock = -1; 558 } 559 } 560 } 561 562 if ((fd_klog = open(_PATH_KLOG, O_RDONLY, 0)) == -1) { 563 log_warn("open %s", _PATH_KLOG); 564 } else if (fd_sendsys != -1) { 565 if (ioctl(fd_klog, LIOCSFD, &pair[1]) == -1) 566 log_warn("ioctl klog LIOCSFD sendsyslog"); 567 } 568 if (fd_sendsys != -1) 569 close(pair[1]); 570 571 if (tls_init() == -1) { 572 log_warn("tls_init"); 573 } else { 574 if ((client_config = tls_config_new()) == NULL) 575 log_warn("tls_config_new client"); 576 if (tls_hostport) { 577 if ((server_config = tls_config_new()) == NULL) 578 log_warn("tls_config_new server"); 579 if ((server_ctx = tls_server()) == NULL) { 580 log_warn("tls_server"); 581 for (i = 0; i < ntls; i++) 582 close(fd_tls[i]); 583 free(fd_tls); 584 fd_tls = NULL; 585 free(tls_host); 586 free(tls_port); 587 tls_host = tls_port = NULL; 588 ntls = 0; 589 } 590 } 591 } 592 if (client_config) { 593 if (NoVerify) { 594 tls_config_insecure_noverifycert(client_config); 595 tls_config_insecure_noverifyname(client_config); 596 } else { 597 if (tls_config_set_ca_file(client_config, 598 CAfile) == -1) { 599 log_warnx("load client TLS CA: %s", 600 tls_config_error(client_config)); 601 /* avoid reading default certs in chroot */ 602 tls_config_set_ca_mem(client_config, "", 0); 603 } else 604 log_debug("CAfile %s", CAfile); 605 } 606 if (ClientCertfile && ClientKeyfile) { 607 if (tls_config_set_cert_file(client_config, 608 ClientCertfile) == -1) 609 log_warnx("load client TLS cert: %s", 610 tls_config_error(client_config)); 611 else 612 log_debug("ClientCertfile %s", ClientCertfile); 613 614 if (tls_config_set_key_file(client_config, 615 ClientKeyfile) == -1) 616 log_warnx("load client TLS key: %s", 617 tls_config_error(client_config)); 618 else 619 log_debug("ClientKeyfile %s", ClientKeyfile); 620 } else if (ClientCertfile || ClientKeyfile) { 621 log_warnx("options -c and -k must be used together"); 622 } 623 if (tls_config_set_protocols(client_config, 624 TLS_PROTOCOLS_ALL) != 0) 625 log_warnx("set client TLS protocols: %s", 626 tls_config_error(client_config)); 627 if (tls_config_set_ciphers(client_config, "all") != 0) 628 log_warnx("set client TLS ciphers: %s", 629 tls_config_error(client_config)); 630 } 631 if (server_config && server_ctx) { 632 const char *names[2]; 633 634 names[0] = tls_hostport; 635 names[1] = tls_host[0]; 636 637 for (i = 0; i < 2; i++) { 638 if (asprintf(&p, "/etc/ssl/private/%s.key", names[i]) 639 == -1) 640 continue; 641 if (tls_config_set_key_file(server_config, p) == -1) { 642 log_warnx("load server TLS key: %s", 643 tls_config_error(server_config)); 644 free(p); 645 continue; 646 } 647 log_debug("Keyfile %s", p); 648 free(p); 649 if (asprintf(&p, "/etc/ssl/%s.crt", names[i]) == -1) 650 continue; 651 if (tls_config_set_cert_file(server_config, p) == -1) { 652 log_warnx("load server TLS cert: %s", 653 tls_config_error(server_config)); 654 free(p); 655 continue; 656 } 657 log_debug("Certfile %s", p); 658 free(p); 659 break; 660 } 661 662 if (ServerCAfile) { 663 if (tls_config_set_ca_file(server_config, 664 ServerCAfile) == -1) { 665 log_warnx("load server TLS CA: %s", 666 tls_config_error(server_config)); 667 /* avoid reading default certs in chroot */ 668 tls_config_set_ca_mem(server_config, "", 0); 669 } else 670 log_debug("Server CAfile %s", ServerCAfile); 671 tls_config_verify_client(server_config); 672 } 673 if (tls_config_set_protocols(server_config, 674 TLS_PROTOCOLS_ALL) != 0) 675 log_warnx("set server TLS protocols: %s", 676 tls_config_error(server_config)); 677 if (tls_config_set_ciphers(server_config, "compat") != 0) 678 log_warnx("Set server TLS ciphers: %s", 679 tls_config_error(server_config)); 680 if (tls_configure(server_ctx, server_config) != 0) { 681 log_warnx("tls_configure server: %s", 682 tls_error(server_ctx)); 683 tls_free(server_ctx); 684 server_ctx = NULL; 685 for (i = 0; i < ntls; i++) 686 close(fd_tls[i]); 687 free(fd_tls); 688 fd_tls = NULL; 689 free(tls_host); 690 free(tls_port); 691 tls_host = tls_port = NULL; 692 ntls = 0; 693 } 694 } 695 696 log_debug("off & running...."); 697 698 if (!Debug && !Foreground) { 699 char c; 700 701 pipe(lockpipe); 702 703 switch(fork()) { 704 case -1: 705 err(1, "fork"); 706 case 0: 707 setsid(); 708 close(lockpipe[0]); 709 break; 710 default: 711 close(lockpipe[1]); 712 read(lockpipe[0], &c, 1); 713 _exit(0); 714 } 715 } 716 717 /* tuck my process id away */ 718 if (!Debug) { 719 FILE *fp; 720 721 fp = fopen(_PATH_LOGPID, "w"); 722 if (fp != NULL) { 723 fprintf(fp, "%ld\n", (long)getpid()); 724 (void) fclose(fp); 725 } 726 } 727 728 /* Privilege separation begins here */ 729 priv_init(lockpipe[1], nullfd, argc, argv); 730 731 if (pledge("stdio unix inet recvfd", NULL) == -1) 732 err(1, "pledge"); 733 734 Started = 1; 735 736 /* Process is now unprivileged and inside a chroot */ 737 if (Debug) 738 event_set_log_callback(logevent); 739 event_init(); 740 741 if ((ev_ctlaccept = malloc(sizeof(struct event))) == NULL || 742 (ev_ctlread = malloc(sizeof(struct event))) == NULL || 743 (ev_ctlwrite = malloc(sizeof(struct event))) == NULL || 744 (ev_klog = malloc(sizeof(struct event))) == NULL || 745 (ev_sendsys = malloc(sizeof(struct event))) == NULL || 746 (ev_udp = malloc(sizeof(struct event))) == NULL || 747 (ev_udp6 = malloc(sizeof(struct event))) == NULL || 748 (ev_bind = reallocarray(NULL, nbind, sizeof(struct event))) 749 == NULL || 750 (ev_listen = reallocarray(NULL, nlisten, sizeof(struct event))) 751 == NULL || 752 (ev_tls = reallocarray(NULL, ntls, sizeof(struct event))) 753 == NULL || 754 (ev_unix = reallocarray(NULL, nunix, sizeof(struct event))) 755 == NULL || 756 (ev_hup = malloc(sizeof(struct event))) == NULL || 757 (ev_int = malloc(sizeof(struct event))) == NULL || 758 (ev_quit = malloc(sizeof(struct event))) == NULL || 759 (ev_term = malloc(sizeof(struct event))) == NULL || 760 (ev_mark = malloc(sizeof(struct event))) == NULL) 761 err(1, "malloc"); 762 763 event_set(ev_ctlaccept, fd_ctlsock, EV_READ|EV_PERSIST, 764 ctlsock_acceptcb, ev_ctlaccept); 765 event_set(ev_ctlread, fd_ctlconn, EV_READ|EV_PERSIST, 766 ctlconn_readcb, ev_ctlread); 767 event_set(ev_ctlwrite, fd_ctlconn, EV_WRITE|EV_PERSIST, 768 ctlconn_writecb, ev_ctlwrite); 769 event_set(ev_klog, fd_klog, EV_READ|EV_PERSIST, klog_readcb, ev_klog); 770 event_set(ev_sendsys, fd_sendsys, EV_READ|EV_PERSIST, unix_readcb, 771 ev_sendsys); 772 event_set(ev_udp, fd_udp, EV_READ|EV_PERSIST, udp_readcb, ev_udp); 773 event_set(ev_udp6, fd_udp6, EV_READ|EV_PERSIST, udp_readcb, ev_udp6); 774 for (i = 0; i < nbind; i++) 775 event_set(&ev_bind[i], fd_bind[i], EV_READ|EV_PERSIST, 776 udp_readcb, &ev_bind[i]); 777 for (i = 0; i < nlisten; i++) 778 event_set(&ev_listen[i], fd_listen[i], EV_READ|EV_PERSIST, 779 tcp_acceptcb, &ev_listen[i]); 780 for (i = 0; i < ntls; i++) 781 event_set(&ev_tls[i], fd_tls[i], EV_READ|EV_PERSIST, 782 tls_acceptcb, &ev_tls[i]); 783 for (i = 0; i < nunix; i++) 784 event_set(&ev_unix[i], fd_unix[i], EV_READ|EV_PERSIST, 785 unix_readcb, &ev_unix[i]); 786 787 signal_set(ev_hup, SIGHUP, init_signalcb, ev_hup); 788 signal_set(ev_int, SIGINT, die_signalcb, ev_int); 789 signal_set(ev_quit, SIGQUIT, die_signalcb, ev_quit); 790 signal_set(ev_term, SIGTERM, die_signalcb, ev_term); 791 792 evtimer_set(ev_mark, mark_timercb, ev_mark); 793 794 init(); 795 796 /* Allocate ctl socket reply buffer if we have a ctl socket */ 797 if (fd_ctlsock != -1 && 798 (ctl_reply = malloc(CTL_REPLY_MAXSIZE)) == NULL) 799 fatal("allocate control socket reply buffer"); 800 reply_text = ctl_reply + CTL_HDR_LEN; 801 802 if (!Debug) { 803 close(lockpipe[1]); 804 dup2(nullfd, STDIN_FILENO); 805 dup2(nullfd, STDOUT_FILENO); 806 dup2(nullfd, STDERR_FILENO); 807 } 808 if (nullfd > 2) 809 close(nullfd); 810 811 /* 812 * Signal to the priv process that the initial config parsing is done 813 * so that it will reject any future attempts to open more files 814 */ 815 priv_config_parse_done(); 816 817 if (fd_ctlsock != -1) 818 event_add(ev_ctlaccept, NULL); 819 if (fd_klog != -1) 820 event_add(ev_klog, NULL); 821 if (fd_sendsys != -1) 822 event_add(ev_sendsys, NULL); 823 if (!SecureMode) { 824 if (fd_udp != -1) 825 event_add(ev_udp, NULL); 826 if (fd_udp6 != -1) 827 event_add(ev_udp6, NULL); 828 } 829 for (i = 0; i < nbind; i++) 830 if (fd_bind[i] != -1) 831 event_add(&ev_bind[i], NULL); 832 for (i = 0; i < nlisten; i++) 833 if (fd_listen[i] != -1) 834 event_add(&ev_listen[i], NULL); 835 for (i = 0; i < ntls; i++) 836 if (fd_tls[i] != -1) 837 event_add(&ev_tls[i], NULL); 838 for (i = 0; i < nunix; i++) 839 if (fd_unix[i] != -1) 840 event_add(&ev_unix[i], NULL); 841 842 signal_add(ev_hup, NULL); 843 signal_add(ev_term, NULL); 844 if (Debug) { 845 signal_add(ev_int, NULL); 846 signal_add(ev_quit, NULL); 847 } else { 848 (void)signal(SIGINT, SIG_IGN); 849 (void)signal(SIGQUIT, SIG_IGN); 850 } 851 (void)signal(SIGCHLD, SIG_IGN); 852 (void)signal(SIGPIPE, SIG_IGN); 853 854 to.tv_sec = TIMERINTVL; 855 to.tv_usec = 0; 856 evtimer_add(ev_mark, &to); 857 858 log_info(LOG_INFO, "start"); 859 log_debug("syslogd: started"); 860 861 sigemptyset(&sigmask); 862 if (sigprocmask(SIG_SETMASK, &sigmask, NULL) == -1) 863 err(1, "sigprocmask unblock"); 864 865 event_dispatch(); 866 /* NOTREACHED */ 867 return (0); 868 } 869 870 void 871 address_alloc(const char *name, const char *address, char ***host, 872 char ***port, int *num) 873 { 874 char *p; 875 876 /* do not care about memory leak, argv has to be preserved */ 877 if ((p = strdup(address)) == NULL) 878 err(1, "%s address %s", name, address); 879 if ((*host = reallocarray(*host, *num + 1, sizeof(**host))) == NULL) 880 err(1, "%s host %s", name, address); 881 if ((*port = reallocarray(*port, *num + 1, sizeof(**port))) == NULL) 882 err(1, "%s port %s", name, address); 883 if (loghost_parse(p, NULL, *host + *num, *port + *num) == -1) 884 errx(1, "bad %s address: %s", name, address); 885 (*num)++; 886 } 887 888 int 889 socket_bind(const char *proto, const char *host, const char *port, 890 int shutread, int *fd, int *fd6) 891 { 892 struct addrinfo hints, *res, *res0; 893 char hostname[NI_MAXHOST], servname[NI_MAXSERV]; 894 int *fdp, error, reuseaddr; 895 896 *fd = *fd6 = -1; 897 if (proto == NULL) 898 proto = "udp"; 899 if (port == NULL) 900 port = strcmp(proto, "tls") == 0 ? "syslog-tls" : "syslog"; 901 902 memset(&hints, 0, sizeof(hints)); 903 hints.ai_family = Family; 904 if (strcmp(proto, "udp") == 0) { 905 hints.ai_socktype = SOCK_DGRAM; 906 hints.ai_protocol = IPPROTO_UDP; 907 } else { 908 hints.ai_socktype = SOCK_STREAM; 909 hints.ai_protocol = IPPROTO_TCP; 910 } 911 hints.ai_flags = AI_PASSIVE; 912 913 if ((error = getaddrinfo(host, port, &hints, &res0))) { 914 log_warnx("getaddrinfo proto %s, host %s, port %s: %s", 915 proto, host ? host : "*", port, gai_strerror(error)); 916 return (-1); 917 } 918 919 for (res = res0; res; res = res->ai_next) { 920 switch (res->ai_family) { 921 case AF_INET: 922 fdp = fd; 923 break; 924 case AF_INET6: 925 fdp = fd6; 926 break; 927 default: 928 continue; 929 } 930 if (*fdp >= 0) 931 continue; 932 933 if ((*fdp = socket(res->ai_family, 934 res->ai_socktype | SOCK_NONBLOCK, res->ai_protocol)) == -1) 935 continue; 936 937 if (getnameinfo(res->ai_addr, res->ai_addrlen, hostname, 938 sizeof(hostname), servname, sizeof(servname), 939 NI_NUMERICHOST | NI_NUMERICSERV | 940 (res->ai_socktype == SOCK_DGRAM ? NI_DGRAM : 0)) != 0) { 941 log_debug("Malformed bind address"); 942 hostname[0] = servname[0] = '\0'; 943 } 944 if (shutread && shutdown(*fdp, SHUT_RD) == -1) { 945 log_warn("shutdown SHUT_RD " 946 "protocol %d, address %s, portnum %s", 947 res->ai_protocol, hostname, servname); 948 close(*fdp); 949 *fdp = -1; 950 continue; 951 } 952 if (!shutread && res->ai_protocol == IPPROTO_UDP) 953 double_sockbuf(*fdp, SO_RCVBUF); 954 else if (res->ai_protocol == IPPROTO_TCP) 955 set_sockbuf(*fdp); 956 reuseaddr = 1; 957 if (setsockopt(*fdp, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, 958 sizeof(reuseaddr)) == -1) { 959 log_warn("setsockopt SO_REUSEADDR " 960 "protocol %d, address %s, portnum %s", 961 res->ai_protocol, hostname, servname); 962 close(*fdp); 963 *fdp = -1; 964 continue; 965 } 966 if (bind(*fdp, res->ai_addr, res->ai_addrlen) == -1) { 967 log_warn("bind protocol %d, address %s, portnum %s", 968 res->ai_protocol, hostname, servname); 969 close(*fdp); 970 *fdp = -1; 971 continue; 972 } 973 if (!shutread && res->ai_protocol == IPPROTO_TCP && 974 listen(*fdp, 10) == -1) { 975 log_warn("listen protocol %d, address %s, portnum %s", 976 res->ai_protocol, hostname, servname); 977 close(*fdp); 978 *fdp = -1; 979 continue; 980 } 981 } 982 983 freeaddrinfo(res0); 984 985 if (*fd == -1 && *fd6 == -1) 986 return (-1); 987 return (0); 988 } 989 990 void 991 klog_readcb(int fd, short event, void *arg) 992 { 993 struct event *ev = arg; 994 ssize_t n; 995 996 n = read(fd, linebuf, linesize - 1); 997 if (n > 0) { 998 linebuf[n] = '\0'; 999 printsys(linebuf); 1000 } else if (n < 0 && errno != EINTR) { 1001 log_warn("read klog"); 1002 event_del(ev); 1003 } 1004 } 1005 1006 void 1007 udp_readcb(int fd, short event, void *arg) 1008 { 1009 struct sockaddr_storage sa; 1010 socklen_t salen; 1011 ssize_t n; 1012 1013 salen = sizeof(sa); 1014 n = recvfrom(fd, linebuf, MAXLINE, 0, (struct sockaddr *)&sa, &salen); 1015 if (n > 0) { 1016 char resolve[NI_MAXHOST]; 1017 1018 linebuf[n] = '\0'; 1019 cvthname((struct sockaddr *)&sa, resolve, sizeof(resolve)); 1020 log_debug("cvthname res: %s", resolve); 1021 printline(resolve, linebuf); 1022 } else if (n < 0 && errno != EINTR && errno != EWOULDBLOCK) 1023 log_warn("recvfrom udp"); 1024 } 1025 1026 void 1027 unix_readcb(int fd, short event, void *arg) 1028 { 1029 struct sockaddr_un sa; 1030 socklen_t salen; 1031 ssize_t n; 1032 1033 salen = sizeof(sa); 1034 n = recvfrom(fd, linebuf, MAXLINE, 0, (struct sockaddr *)&sa, &salen); 1035 if (n > 0) { 1036 linebuf[n] = '\0'; 1037 printline(LocalHostName, linebuf); 1038 } else if (n < 0 && errno != EINTR && errno != EWOULDBLOCK) 1039 log_warn("recvfrom unix"); 1040 } 1041 1042 int 1043 reserve_accept4(int lfd, int event, struct event *ev, 1044 void (*cb)(int, short, void *), 1045 struct sockaddr *sa, socklen_t *salen, int flags) 1046 { 1047 struct timeval to = { 1, 0 }; 1048 int afd; 1049 1050 if (event & EV_TIMEOUT) { 1051 log_debug("Listen again"); 1052 /* Enable the listen event, there is no timeout anymore. */ 1053 event_set(ev, lfd, EV_READ|EV_PERSIST, cb, ev); 1054 event_add(ev, NULL); 1055 errno = EWOULDBLOCK; 1056 return (-1); 1057 } 1058 1059 if (getdtablecount() + FD_RESERVE >= getdtablesize()) { 1060 afd = -1; 1061 errno = EMFILE; 1062 } else 1063 afd = accept4(lfd, sa, salen, flags); 1064 1065 if (afd == -1 && (errno == ENFILE || errno == EMFILE)) { 1066 log_info(LOG_WARNING, "accept deferred: %s", strerror(errno)); 1067 /* 1068 * Disable the listen event and convert it to a timeout. 1069 * Pass the listen file descriptor to the callback. 1070 */ 1071 event_del(ev); 1072 event_set(ev, lfd, 0, cb, ev); 1073 event_add(ev, &to); 1074 return (-1); 1075 } 1076 1077 return (afd); 1078 } 1079 1080 void 1081 tcp_acceptcb(int lfd, short event, void *arg) 1082 { 1083 acceptcb(lfd, event, arg, 0); 1084 } 1085 1086 void 1087 tls_acceptcb(int lfd, short event, void *arg) 1088 { 1089 acceptcb(lfd, event, arg, 1); 1090 } 1091 1092 void 1093 acceptcb(int lfd, short event, void *arg, int usetls) 1094 { 1095 struct event *ev = arg; 1096 struct peer *p; 1097 struct sockaddr_storage ss; 1098 socklen_t sslen; 1099 char hostname[NI_MAXHOST], servname[NI_MAXSERV]; 1100 char *peername; 1101 int fd; 1102 1103 sslen = sizeof(ss); 1104 if ((fd = reserve_accept4(lfd, event, ev, tcp_acceptcb, 1105 (struct sockaddr *)&ss, &sslen, SOCK_NONBLOCK)) == -1) { 1106 if (errno != ENFILE && errno != EMFILE && 1107 errno != EINTR && errno != EWOULDBLOCK && 1108 errno != ECONNABORTED) 1109 log_warn("accept tcp socket"); 1110 return; 1111 } 1112 log_debug("Accepting tcp connection"); 1113 1114 if (getnameinfo((struct sockaddr *)&ss, sslen, hostname, 1115 sizeof(hostname), servname, sizeof(servname), 1116 NI_NUMERICHOST | NI_NUMERICSERV) != 0 || 1117 asprintf(&peername, ss.ss_family == AF_INET6 ? 1118 "[%s]:%s" : "%s:%s", hostname, servname) == -1) { 1119 log_debug("Malformed accept address"); 1120 peername = hostname_unknown; 1121 } 1122 log_debug("Peer addresss and port %s", peername); 1123 if ((p = malloc(sizeof(*p))) == NULL) { 1124 log_warn("allocate \"%s\"", peername); 1125 close(fd); 1126 return; 1127 } 1128 p->p_fd = fd; 1129 if ((p->p_bufev = bufferevent_new(fd, tcp_readcb, NULL, tcp_closecb, 1130 p)) == NULL) { 1131 log_warn("bufferevent \"%s\"", peername); 1132 free(p); 1133 close(fd); 1134 return; 1135 } 1136 p->p_ctx = NULL; 1137 if (usetls) { 1138 if (tls_accept_socket(server_ctx, &p->p_ctx, fd) < 0) { 1139 log_warnx("tls_accept_socket \"%s\": %s", 1140 peername, tls_error(server_ctx)); 1141 bufferevent_free(p->p_bufev); 1142 free(p); 1143 close(fd); 1144 return; 1145 } 1146 buffertls_set(&p->p_buftls, p->p_bufev, p->p_ctx, fd); 1147 buffertls_accept(&p->p_buftls, fd); 1148 log_debug("tcp accept callback: tls context success"); 1149 } 1150 if (!NoDNS && peername != hostname_unknown && 1151 priv_getnameinfo((struct sockaddr *)&ss, ss.ss_len, hostname, 1152 sizeof(hostname)) != 0) { 1153 log_debug("Host name for accept address (%s) unknown", 1154 hostname); 1155 } 1156 if (peername == hostname_unknown || 1157 (p->p_hostname = strdup(hostname)) == NULL) 1158 p->p_hostname = hostname_unknown; 1159 log_debug("Peer hostname %s", hostname); 1160 p->p_peername = peername; 1161 bufferevent_enable(p->p_bufev, EV_READ); 1162 1163 log_info(LOG_DEBUG, "%s logger \"%s\" accepted", 1164 p->p_ctx ? "tls" : "tcp", peername); 1165 } 1166 1167 /* 1168 * Syslog over TCP RFC 6587 3.4.1. Octet Counting 1169 */ 1170 int 1171 octet_counting(struct evbuffer *evbuf, char **msg, int drain) 1172 { 1173 char *p, *buf, *end; 1174 int len; 1175 1176 buf = EVBUFFER_DATA(evbuf); 1177 end = buf + EVBUFFER_LENGTH(evbuf); 1178 /* 1179 * It can be assumed that octet-counting framing is used if a syslog 1180 * frame starts with a digit. 1181 */ 1182 if (buf >= end || !isdigit((unsigned char)*buf)) 1183 return (-1); 1184 /* 1185 * SYSLOG-FRAME = MSG-LEN SP SYSLOG-MSG 1186 * MSG-LEN is the octet count of the SYSLOG-MSG in the SYSLOG-FRAME. 1187 * We support up to 5 digits in MSG-LEN, so the maximum is 99999. 1188 */ 1189 for (p = buf; p < end && p < buf + 5; p++) { 1190 if (!isdigit((unsigned char)*p)) 1191 break; 1192 } 1193 if (buf >= p || p >= end || *p != ' ') 1194 return (-1); 1195 p++; 1196 /* Using atoi() is safe as buf starts with 1 to 5 digits and a space. */ 1197 len = atoi(buf); 1198 if (drain) 1199 log_debugadd(" octet counting %d", len); 1200 if (p + len > end) 1201 return (0); 1202 if (drain) 1203 evbuffer_drain(evbuf, p - buf); 1204 if (msg) 1205 *msg = p; 1206 return (len); 1207 } 1208 1209 /* 1210 * Syslog over TCP RFC 6587 3.4.2. Non-Transparent-Framing 1211 */ 1212 int 1213 non_transparent_framing(struct evbuffer *evbuf, char **msg) 1214 { 1215 char *p, *buf, *end; 1216 1217 buf = EVBUFFER_DATA(evbuf); 1218 end = buf + EVBUFFER_LENGTH(evbuf); 1219 /* 1220 * The TRAILER has usually been a single character and most often 1221 * is ASCII LF (%d10). However, other characters have also been 1222 * seen, with ASCII NUL (%d00) being a prominent example. 1223 */ 1224 for (p = buf; p < end; p++) { 1225 if (*p == '\0' || *p == '\n') 1226 break; 1227 } 1228 if (p + 1 - buf >= INT_MAX) 1229 return (-1); 1230 log_debugadd(" non transparent framing"); 1231 if (p >= end) 1232 return (0); 1233 /* 1234 * Some devices have also been seen to emit a two-character 1235 * TRAILER, which is usually CR and LF. 1236 */ 1237 if (buf < p && p[0] == '\n' && p[-1] == '\r') 1238 p[-1] = '\0'; 1239 if (msg) 1240 *msg = buf; 1241 return (p + 1 - buf); 1242 } 1243 1244 void 1245 tcp_readcb(struct bufferevent *bufev, void *arg) 1246 { 1247 struct peer *p = arg; 1248 char *msg; 1249 int len; 1250 1251 while (EVBUFFER_LENGTH(bufev->input) > 0) { 1252 log_debugadd("%s logger \"%s\"", p->p_ctx ? "tls" : "tcp", 1253 p->p_peername); 1254 msg = NULL; 1255 len = octet_counting(bufev->input, &msg, 1); 1256 if (len < 0) 1257 len = non_transparent_framing(bufev->input, &msg); 1258 if (len < 0) 1259 log_debugadd("unknown method"); 1260 if (msg == NULL) { 1261 log_debugadd(", incomplete frame"); 1262 break; 1263 } 1264 log_debug(", use %d bytes", len); 1265 if (len > 0 && msg[len-1] == '\n') 1266 msg[len-1] = '\0'; 1267 if (len == 0 || msg[len-1] != '\0') { 1268 memcpy(linebuf, msg, MINIMUM(len, MAXLINE)); 1269 linebuf[MINIMUM(len, MAXLINE)] = '\0'; 1270 msg = linebuf; 1271 } 1272 printline(p->p_hostname, msg); 1273 evbuffer_drain(bufev->input, len); 1274 } 1275 /* Maximum frame has 5 digits, 1 space, MAXLINE chars, 1 new line. */ 1276 if (EVBUFFER_LENGTH(bufev->input) >= 5 + 1 + MAXLINE + 1) { 1277 log_debug(", use %zu bytes", EVBUFFER_LENGTH(bufev->input)); 1278 printline(p->p_hostname, EVBUFFER_DATA(bufev->input)); 1279 evbuffer_drain(bufev->input, -1); 1280 } else if (EVBUFFER_LENGTH(bufev->input) > 0) 1281 log_debug(", buffer %zu bytes", EVBUFFER_LENGTH(bufev->input)); 1282 } 1283 1284 void 1285 tcp_closecb(struct bufferevent *bufev, short event, void *arg) 1286 { 1287 struct peer *p = arg; 1288 1289 if (event & EVBUFFER_EOF) { 1290 log_info(LOG_DEBUG, "%s logger \"%s\" connection close", 1291 p->p_ctx ? "tls" : "tcp", p->p_peername); 1292 } else { 1293 log_info(LOG_NOTICE, "%s logger \"%s\" connection error: %s", 1294 p->p_ctx ? "tls" : "tcp", p->p_peername, 1295 p->p_ctx ? tls_error(p->p_ctx) : strerror(errno)); 1296 } 1297 1298 if (p->p_peername != hostname_unknown) 1299 free(p->p_peername); 1300 if (p->p_hostname != hostname_unknown) 1301 free(p->p_hostname); 1302 bufferevent_free(p->p_bufev); 1303 close(p->p_fd); 1304 free(p); 1305 } 1306 1307 int 1308 tcp_socket(struct filed *f) 1309 { 1310 int s; 1311 1312 if ((s = socket(f->f_un.f_forw.f_addr.ss_family, 1313 SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP)) == -1) { 1314 log_warn("socket \"%s\"", f->f_un.f_forw.f_loghost); 1315 return (-1); 1316 } 1317 set_sockbuf(s); 1318 if (connect(s, (struct sockaddr *)&f->f_un.f_forw.f_addr, 1319 f->f_un.f_forw.f_addr.ss_len) == -1 && errno != EINPROGRESS) { 1320 log_warn("connect \"%s\"", f->f_un.f_forw.f_loghost); 1321 close(s); 1322 return (-1); 1323 } 1324 return (s); 1325 } 1326 1327 void 1328 tcp_dropcb(struct bufferevent *bufev, void *arg) 1329 { 1330 struct filed *f = arg; 1331 1332 /* 1333 * Drop data received from the forward log server. 1334 */ 1335 log_debug("loghost \"%s\" did send %zu bytes back", 1336 f->f_un.f_forw.f_loghost, EVBUFFER_LENGTH(bufev->input)); 1337 evbuffer_drain(bufev->input, -1); 1338 } 1339 1340 void 1341 tcp_writecb(struct bufferevent *bufev, void *arg) 1342 { 1343 struct filed *f = arg; 1344 1345 /* 1346 * Successful write, connection to server is good, reset wait time. 1347 */ 1348 log_debug("loghost \"%s\" successful write", f->f_un.f_forw.f_loghost); 1349 f->f_un.f_forw.f_reconnectwait = 0; 1350 1351 if (f->f_un.f_forw.f_dropped > 0 && 1352 EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->output) < MAX_TCPBUF) { 1353 log_info(LOG_WARNING, "dropped %d message%s to loghost \"%s\"", 1354 f->f_un.f_forw.f_dropped, 1355 f->f_un.f_forw.f_dropped == 1 ? "" : "s", 1356 f->f_un.f_forw.f_loghost); 1357 f->f_un.f_forw.f_dropped = 0; 1358 } 1359 } 1360 1361 void 1362 tcp_errorcb(struct bufferevent *bufev, short event, void *arg) 1363 { 1364 struct filed *f = arg; 1365 char *p, *buf, *end; 1366 int l; 1367 char ebuf[ERRBUFSIZE]; 1368 1369 if (event & EVBUFFER_EOF) 1370 snprintf(ebuf, sizeof(ebuf), "loghost \"%s\" connection close", 1371 f->f_un.f_forw.f_loghost); 1372 else 1373 snprintf(ebuf, sizeof(ebuf), 1374 "loghost \"%s\" connection error: %s", 1375 f->f_un.f_forw.f_loghost, f->f_un.f_forw.f_ctx ? 1376 tls_error(f->f_un.f_forw.f_ctx) : strerror(errno)); 1377 log_debug("%s", ebuf); 1378 1379 /* The SIGHUP handler may also close the socket, so invalidate it. */ 1380 if (f->f_un.f_forw.f_ctx) { 1381 tls_close(f->f_un.f_forw.f_ctx); 1382 tls_free(f->f_un.f_forw.f_ctx); 1383 f->f_un.f_forw.f_ctx = NULL; 1384 } 1385 close(f->f_file); 1386 f->f_file = -1; 1387 1388 /* 1389 * The messages in the output buffer may be out of sync. 1390 * Check that the buffer starts with "1234 <1234 octets>\n". 1391 * Otherwise remove the partial message from the beginning. 1392 */ 1393 buf = EVBUFFER_DATA(bufev->output); 1394 end = buf + EVBUFFER_LENGTH(bufev->output); 1395 if (buf < end && !((l = octet_counting(bufev->output, &p, 0)) > 0 && 1396 p[l-1] == '\n')) { 1397 for (p = buf; p < end; p++) { 1398 if (*p == '\n') { 1399 evbuffer_drain(bufev->output, p - buf + 1); 1400 break; 1401 } 1402 } 1403 /* Without '\n' discard everything. */ 1404 if (p == end) 1405 evbuffer_drain(bufev->output, -1); 1406 log_debug("loghost \"%s\" dropped partial message", 1407 f->f_un.f_forw.f_loghost); 1408 f->f_un.f_forw.f_dropped++; 1409 } 1410 1411 tcp_connect_retry(bufev, f); 1412 1413 /* Log the connection error to the fresh buffer after reconnecting. */ 1414 log_info(LOG_WARNING, "%s", ebuf); 1415 } 1416 1417 void 1418 tcp_connectcb(int fd, short event, void *arg) 1419 { 1420 struct filed *f = arg; 1421 struct bufferevent *bufev = f->f_un.f_forw.f_bufev; 1422 int s; 1423 1424 if ((s = tcp_socket(f)) == -1) { 1425 tcp_connect_retry(bufev, f); 1426 return; 1427 } 1428 log_debug("tcp connect callback: socket success, event %#x", event); 1429 f->f_file = s; 1430 1431 bufferevent_setfd(bufev, s); 1432 bufferevent_setcb(bufev, tcp_dropcb, tcp_writecb, tcp_errorcb, f); 1433 /* 1434 * Although syslog is a write only protocol, enable reading from 1435 * the socket to detect connection close and errors. 1436 */ 1437 bufferevent_enable(bufev, EV_READ|EV_WRITE); 1438 1439 if (f->f_type == F_FORWTLS) { 1440 if ((f->f_un.f_forw.f_ctx = tls_client()) == NULL) { 1441 log_warn("tls_client \"%s\"", f->f_un.f_forw.f_loghost); 1442 goto error; 1443 } 1444 if (client_config && 1445 tls_configure(f->f_un.f_forw.f_ctx, client_config) == -1) { 1446 log_warnx("tls_configure \"%s\": %s", 1447 f->f_un.f_forw.f_loghost, 1448 tls_error(f->f_un.f_forw.f_ctx)); 1449 goto error; 1450 } 1451 if (tls_connect_socket(f->f_un.f_forw.f_ctx, s, 1452 f->f_un.f_forw.f_host) == -1) { 1453 log_warnx("tls_connect_socket \"%s\": %s", 1454 f->f_un.f_forw.f_loghost, 1455 tls_error(f->f_un.f_forw.f_ctx)); 1456 goto error; 1457 } 1458 log_debug("tcp connect callback: tls context success"); 1459 1460 buffertls_set(&f->f_un.f_forw.f_buftls, bufev, 1461 f->f_un.f_forw.f_ctx, s); 1462 buffertls_connect(&f->f_un.f_forw.f_buftls, s); 1463 } 1464 1465 return; 1466 1467 error: 1468 if (f->f_un.f_forw.f_ctx) { 1469 tls_free(f->f_un.f_forw.f_ctx); 1470 f->f_un.f_forw.f_ctx = NULL; 1471 } 1472 close(f->f_file); 1473 f->f_file = -1; 1474 tcp_connect_retry(bufev, f); 1475 } 1476 1477 void 1478 tcp_connect_retry(struct bufferevent *bufev, struct filed *f) 1479 { 1480 struct timeval to; 1481 1482 if (f->f_un.f_forw.f_reconnectwait == 0) 1483 f->f_un.f_forw.f_reconnectwait = 1; 1484 else 1485 f->f_un.f_forw.f_reconnectwait <<= 1; 1486 if (f->f_un.f_forw.f_reconnectwait > 600) 1487 f->f_un.f_forw.f_reconnectwait = 600; 1488 to.tv_sec = f->f_un.f_forw.f_reconnectwait; 1489 to.tv_usec = 0; 1490 1491 log_debug("tcp connect retry: wait %d", 1492 f->f_un.f_forw.f_reconnectwait); 1493 bufferevent_setfd(bufev, -1); 1494 /* We can reuse the write event as bufferevent is disabled. */ 1495 evtimer_set(&bufev->ev_write, tcp_connectcb, f); 1496 evtimer_add(&bufev->ev_write, &to); 1497 } 1498 1499 int 1500 tcpbuf_countmsg(struct bufferevent *bufev) 1501 { 1502 char *p, *buf, *end; 1503 int i = 0; 1504 1505 buf = EVBUFFER_DATA(bufev->output); 1506 end = buf + EVBUFFER_LENGTH(bufev->output); 1507 for (p = buf; p < end; p++) { 1508 if (*p == '\n') 1509 i++; 1510 } 1511 return (i); 1512 } 1513 1514 void 1515 usage(void) 1516 { 1517 1518 (void)fprintf(stderr, 1519 "usage: syslogd [-46dFhnruVZ] [-a path] [-C CAfile]\n" 1520 "\t[-c cert_file] [-f config_file] [-K CAfile] [-k key_file]\n" 1521 "\t[-m mark_interval] [-p log_socket] [-S listen_address]\n" 1522 "\t[-s reporting_socket] [-T listen_address] [-U bind_address]\n"); 1523 exit(1); 1524 } 1525 1526 /* 1527 * Parse a priority code of the form "<123>" into pri, and return the 1528 * length of the priority code including the surrounding angle brackets. 1529 */ 1530 size_t 1531 parsepriority(const char *msg, int *pri) 1532 { 1533 size_t nlen; 1534 char buf[11]; 1535 const char *errstr; 1536 int maybepri; 1537 1538 if (*msg++ == '<') { 1539 nlen = strspn(msg, "1234567890"); 1540 if (nlen > 0 && nlen < sizeof(buf) && msg[nlen] == '>') { 1541 strlcpy(buf, msg, nlen + 1); 1542 maybepri = strtonum(buf, 0, INT_MAX, &errstr); 1543 if (errstr == NULL) { 1544 *pri = maybepri; 1545 return nlen + 2; 1546 } 1547 } 1548 } 1549 1550 return 0; 1551 } 1552 1553 /* 1554 * Take a raw input line, decode the message, and print the message 1555 * on the appropriate log files. 1556 */ 1557 void 1558 printline(char *hname, char *msg) 1559 { 1560 int pri; 1561 char *p, *q, line[MAXLINE + 4 + 1]; /* message, encoding, NUL */ 1562 1563 /* test for special codes */ 1564 pri = DEFUPRI; 1565 p = msg; 1566 p += parsepriority(p, &pri); 1567 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1568 pri = DEFUPRI; 1569 1570 /* 1571 * Don't allow users to log kernel messages. 1572 * NOTE: since LOG_KERN == 0 this will also match 1573 * messages with no facility specified. 1574 */ 1575 if (LOG_FAC(pri) == LOG_KERN) 1576 pri = LOG_USER | LOG_PRI(pri); 1577 1578 for (q = line; *p && q < &line[MAXLINE]; p++) { 1579 if (*p == '\n') 1580 *q++ = ' '; 1581 else 1582 q = vis(q, *p, 0, 0); 1583 } 1584 line[MAXLINE] = *q = '\0'; 1585 1586 logline(pri, 0, hname, line); 1587 } 1588 1589 /* 1590 * Take a raw input line from /dev/klog, split and format similar to syslog(). 1591 */ 1592 void 1593 printsys(char *msg) 1594 { 1595 int c, pri, flags; 1596 char *lp, *p, *q, line[MAXLINE + 1]; 1597 size_t prilen; 1598 1599 (void)snprintf(line, sizeof line, "%s: ", _PATH_UNIX); 1600 lp = line + strlen(line); 1601 for (p = msg; *p != '\0'; ) { 1602 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 1603 pri = DEFSPRI; 1604 prilen = parsepriority(p, &pri); 1605 p += prilen; 1606 if (prilen == 0) { 1607 /* kernel printf's come out on console */ 1608 flags |= IGN_CONS; 1609 } 1610 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1611 pri = DEFSPRI; 1612 1613 q = lp; 1614 while (*p && (c = *p++) != '\n' && q < &line[sizeof(line) - 4]) 1615 q = vis(q, c, 0, 0); 1616 1617 logline(pri, flags, LocalHostName, line); 1618 } 1619 } 1620 1621 void 1622 vlogmsg(int pri, const char *proc, const char *fmt, va_list ap) 1623 { 1624 char msg[ERRBUFSIZE]; 1625 size_t l; 1626 1627 l = snprintf(msg, sizeof(msg), "%s[%d]: ", proc, getpid()); 1628 if (l < sizeof(msg)) 1629 vsnprintf(msg + l, sizeof(msg) - l, fmt, ap); 1630 if (!Started) { 1631 fprintf(stderr, "%s\n", msg); 1632 return; 1633 } 1634 logline(pri, ADDDATE, LocalHostName, msg); 1635 } 1636 1637 struct timeval now; 1638 1639 /* 1640 * Log a message to the appropriate log files, users, etc. based on 1641 * the priority. 1642 */ 1643 void 1644 logline(int pri, int flags, char *from, char *msg) 1645 { 1646 struct filed *f; 1647 int fac, msglen, prilev, i; 1648 char timestamp[33]; 1649 char prog[NAME_MAX+1]; 1650 1651 log_debug("logline: pri 0%o, flags 0x%x, from %s, msg %s", 1652 pri, flags, from, msg); 1653 1654 /* 1655 * Check to see if msg looks non-standard. 1656 */ 1657 timestamp[0] = '\0'; 1658 msglen = strlen(msg); 1659 if ((flags & ADDDATE) == 0) { 1660 if (msglen >= 16 && msg[3] == ' ' && msg[6] == ' ' && 1661 msg[9] == ':' && msg[12] == ':' && msg[15] == ' ') { 1662 /* BSD syslog TIMESTAMP, RFC 3164 */ 1663 strlcpy(timestamp, msg, 16); 1664 msg += 16; 1665 msglen -= 16; 1666 if (ZuluTime) 1667 flags |= ADDDATE; 1668 } else if (msglen >= 20 && 1669 isdigit(msg[0]) && isdigit(msg[1]) && isdigit(msg[2]) && 1670 isdigit(msg[3]) && msg[4] == '-' && 1671 isdigit(msg[5]) && isdigit(msg[6]) && msg[7] == '-' && 1672 isdigit(msg[8]) && isdigit(msg[9]) && msg[10] == 'T' && 1673 isdigit(msg[11]) && isdigit(msg[12]) && msg[13] == ':' && 1674 isdigit(msg[14]) && isdigit(msg[15]) && msg[16] == ':' && 1675 isdigit(msg[17]) && isdigit(msg[18]) && (msg[19] == '.' || 1676 msg[19] == 'Z' || msg[19] == '+' || msg[19] == '-')) { 1677 /* FULL-DATE "T" FULL-TIME, RFC 5424 */ 1678 strlcpy(timestamp, msg, sizeof(timestamp)); 1679 msg += 19; 1680 msglen -= 19; 1681 i = 0; 1682 if (msglen >= 3 && msg[0] == '.' && isdigit(msg[1])) { 1683 /* TIME-SECFRAC */ 1684 msg += 2; 1685 msglen -= 2; 1686 i += 2; 1687 while(i < 7 && msglen >= 1 && isdigit(msg[0])) { 1688 msg++; 1689 msglen--; 1690 i++; 1691 } 1692 } 1693 if (msglen >= 2 && msg[0] == 'Z' && msg[1] == ' ') { 1694 /* "Z" */ 1695 timestamp[20+i] = '\0'; 1696 msg += 2; 1697 msglen -= 2; 1698 } else if (msglen >= 7 && 1699 (msg[0] == '+' || msg[0] == '-') && 1700 isdigit(msg[1]) && isdigit(msg[2]) && 1701 msg[3] == ':' && 1702 isdigit(msg[4]) && isdigit(msg[5]) && 1703 msg[6] == ' ') { 1704 /* TIME-NUMOFFSET */ 1705 timestamp[25+i] = '\0'; 1706 msg += 7; 1707 msglen -= 7; 1708 } else { 1709 /* invalid time format, roll back */ 1710 timestamp[0] = '\0'; 1711 msg -= 19 + i; 1712 msglen += 19 + i; 1713 flags |= ADDDATE; 1714 } 1715 } else if (msglen >= 2 && msg[0] == '-' && msg[1] == ' ') { 1716 /* NILVALUE, RFC 5424 */ 1717 msg += 2; 1718 msglen -= 2; 1719 flags |= ADDDATE; 1720 } else 1721 flags |= ADDDATE; 1722 } 1723 1724 (void)gettimeofday(&now, NULL); 1725 if (flags & ADDDATE) { 1726 if (ZuluTime) { 1727 struct tm *tm; 1728 size_t l; 1729 1730 tm = gmtime(&now.tv_sec); 1731 l = strftime(timestamp, sizeof(timestamp), "%FT%T", tm); 1732 /* 1733 * Use only millisecond precision as some time has 1734 * passed since syslog(3) was called. 1735 */ 1736 snprintf(timestamp + l, sizeof(timestamp) - l, 1737 ".%03ldZ", now.tv_usec / 1000); 1738 } else 1739 strlcpy(timestamp, ctime(&now.tv_sec) + 4, 16); 1740 } 1741 1742 /* extract facility and priority level */ 1743 if (flags & MARK) 1744 fac = LOG_NFACILITIES; 1745 else { 1746 fac = LOG_FAC(pri); 1747 if (fac >= LOG_NFACILITIES || fac < 0) 1748 fac = LOG_USER; 1749 } 1750 prilev = LOG_PRI(pri); 1751 1752 /* extract program name */ 1753 while (isspace((unsigned char)*msg)) { 1754 msg++; 1755 msglen--; 1756 } 1757 for (i = 0; i < NAME_MAX; i++) { 1758 if (!isalnum((unsigned char)msg[i]) && msg[i] != '-') 1759 break; 1760 prog[i] = msg[i]; 1761 } 1762 prog[i] = 0; 1763 1764 /* log the message to the particular outputs */ 1765 if (!Initialized) { 1766 f = &consfile; 1767 f->f_file = priv_open_tty(ctty); 1768 1769 if (f->f_file >= 0) { 1770 strlcpy(f->f_lasttime, timestamp, 1771 sizeof(f->f_lasttime)); 1772 strlcpy(f->f_prevhost, from, 1773 sizeof(f->f_prevhost)); 1774 fprintlog(f, flags, msg); 1775 (void)close(f->f_file); 1776 f->f_file = -1; 1777 } 1778 return; 1779 } 1780 SIMPLEQ_FOREACH(f, &Files, f_next) { 1781 /* skip messages that are incorrect priority */ 1782 if (f->f_pmask[fac] < prilev || 1783 f->f_pmask[fac] == INTERNAL_NOPRI) 1784 continue; 1785 1786 /* skip messages with the incorrect program or hostname */ 1787 if (f->f_program && strcmp(prog, f->f_program) != 0) 1788 continue; 1789 if (f->f_hostname && strcmp(from, f->f_hostname) != 0) 1790 continue; 1791 1792 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1793 continue; 1794 1795 /* don't output marks to recently written files */ 1796 if ((flags & MARK) && 1797 (now.tv_sec - f->f_time) < MarkInterval / 2) 1798 continue; 1799 1800 /* 1801 * suppress duplicate lines to this file 1802 */ 1803 if ((Repeat == 0 || (Repeat == 1 && 1804 (f->f_type != F_PIPE && f->f_type != F_FORWUDP && 1805 f->f_type != F_FORWTCP && f->f_type != F_FORWTLS))) && 1806 (flags & MARK) == 0 && msglen == f->f_prevlen && 1807 !strcmp(msg, f->f_prevline) && 1808 !strcmp(from, f->f_prevhost)) { 1809 strlcpy(f->f_lasttime, timestamp, 1810 sizeof(f->f_lasttime)); 1811 f->f_prevcount++; 1812 log_debug("msg repeated %d times, %ld sec of %d", 1813 f->f_prevcount, (long)(now.tv_sec - f->f_time), 1814 repeatinterval[f->f_repeatcount]); 1815 /* 1816 * If domark would have logged this by now, 1817 * flush it now (so we don't hold isolated messages), 1818 * but back off so we'll flush less often 1819 * in the future. 1820 */ 1821 if (now.tv_sec > REPEATTIME(f)) { 1822 fprintlog(f, flags, (char *)NULL); 1823 BACKOFF(f); 1824 } 1825 } else { 1826 /* new line, save it */ 1827 if (f->f_prevcount) 1828 fprintlog(f, 0, (char *)NULL); 1829 f->f_repeatcount = 0; 1830 f->f_prevpri = pri; 1831 strlcpy(f->f_lasttime, timestamp, 1832 sizeof(f->f_lasttime)); 1833 strlcpy(f->f_prevhost, from, 1834 sizeof(f->f_prevhost)); 1835 if (msglen < MAXSVLINE) { 1836 f->f_prevlen = msglen; 1837 strlcpy(f->f_prevline, msg, 1838 sizeof(f->f_prevline)); 1839 fprintlog(f, flags, (char *)NULL); 1840 } else { 1841 f->f_prevline[0] = 0; 1842 f->f_prevlen = 0; 1843 fprintlog(f, flags, msg); 1844 } 1845 } 1846 1847 if (f->f_quick) 1848 break; 1849 } 1850 } 1851 1852 void 1853 fprintlog(struct filed *f, int flags, char *msg) 1854 { 1855 struct iovec iov[6]; 1856 struct iovec *v; 1857 int l, retryonce; 1858 char line[MAXLINE + 1], repbuf[80], greetings[500]; 1859 1860 v = iov; 1861 if (f->f_type == F_WALL) { 1862 l = snprintf(greetings, sizeof(greetings), 1863 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1864 f->f_prevhost, ctime(&now.tv_sec)); 1865 if (l < 0 || (size_t)l >= sizeof(greetings)) 1866 l = strlen(greetings); 1867 v->iov_base = greetings; 1868 v->iov_len = l; 1869 v++; 1870 v->iov_base = ""; 1871 v->iov_len = 0; 1872 v++; 1873 } else if (f->f_lasttime[0] != '\0') { 1874 v->iov_base = f->f_lasttime; 1875 v->iov_len = strlen(f->f_lasttime); 1876 v++; 1877 v->iov_base = " "; 1878 v->iov_len = 1; 1879 v++; 1880 } else { 1881 v->iov_base = ""; 1882 v->iov_len = 0; 1883 v++; 1884 v->iov_base = ""; 1885 v->iov_len = 0; 1886 v++; 1887 } 1888 if (f->f_prevhost[0] != '\0') { 1889 v->iov_base = f->f_prevhost; 1890 v->iov_len = strlen(v->iov_base); 1891 v++; 1892 v->iov_base = " "; 1893 v->iov_len = 1; 1894 v++; 1895 } else { 1896 v->iov_base = ""; 1897 v->iov_len = 0; 1898 v++; 1899 v->iov_base = ""; 1900 v->iov_len = 0; 1901 v++; 1902 } 1903 1904 if (msg) { 1905 v->iov_base = msg; 1906 v->iov_len = strlen(msg); 1907 } else if (f->f_prevcount > 1) { 1908 l = snprintf(repbuf, sizeof(repbuf), 1909 "last message repeated %d times", f->f_prevcount); 1910 if (l < 0 || (size_t)l >= sizeof(repbuf)) 1911 l = strlen(repbuf); 1912 v->iov_base = repbuf; 1913 v->iov_len = l; 1914 } else { 1915 v->iov_base = f->f_prevline; 1916 v->iov_len = f->f_prevlen; 1917 } 1918 v++; 1919 1920 log_debugadd("Logging to %s", TypeNames[f->f_type]); 1921 f->f_time = now.tv_sec; 1922 1923 switch (f->f_type) { 1924 case F_UNUSED: 1925 log_debug("%s", ""); 1926 break; 1927 1928 case F_FORWUDP: 1929 log_debug(" %s", f->f_un.f_forw.f_loghost); 1930 l = snprintf(line, MINIMUM(MAX_UDPMSG + 1, sizeof(line)), 1931 "<%d>%.32s %s%s%s", f->f_prevpri, (char *)iov[0].iov_base, 1932 IncludeHostname ? LocalHostName : "", 1933 IncludeHostname ? " " : "", 1934 (char *)iov[4].iov_base); 1935 if (l < 0 || (size_t)l > MINIMUM(MAX_UDPMSG, sizeof(line))) 1936 l = MINIMUM(MAX_UDPMSG, sizeof(line)); 1937 if (sendto(f->f_file, line, l, 0, 1938 (struct sockaddr *)&f->f_un.f_forw.f_addr, 1939 f->f_un.f_forw.f_addr.ss_len) != l) { 1940 switch (errno) { 1941 case EHOSTDOWN: 1942 case EHOSTUNREACH: 1943 case ENETDOWN: 1944 case ENETUNREACH: 1945 case ENOBUFS: 1946 case EWOULDBLOCK: 1947 /* silently dropped */ 1948 break; 1949 default: 1950 f->f_type = F_UNUSED; 1951 log_warn("sendto \"%s\"", 1952 f->f_un.f_forw.f_loghost); 1953 break; 1954 } 1955 } 1956 break; 1957 1958 case F_FORWTCP: 1959 case F_FORWTLS: 1960 log_debugadd(" %s", f->f_un.f_forw.f_loghost); 1961 if (EVBUFFER_LENGTH(f->f_un.f_forw.f_bufev->output) >= 1962 MAX_TCPBUF) { 1963 log_debug(" (dropped)"); 1964 f->f_un.f_forw.f_dropped++; 1965 break; 1966 } 1967 /* 1968 * Syslog over TLS RFC 5425 4.3. Sending Data 1969 * Syslog over TCP RFC 6587 3.4.1. Octet Counting 1970 * Use an additional '\n' to split messages. This allows 1971 * buffer synchronisation, helps legacy implementations, 1972 * and makes line based testing easier. 1973 */ 1974 l = snprintf(line, sizeof(line), "<%d>%.32s %s%s\n", 1975 f->f_prevpri, (char *)iov[0].iov_base, 1976 IncludeHostname ? LocalHostName : "", 1977 IncludeHostname ? " " : ""); 1978 if (l < 0) { 1979 log_debug(" (dropped snprintf)"); 1980 f->f_un.f_forw.f_dropped++; 1981 break; 1982 } 1983 l = evbuffer_add_printf(f->f_un.f_forw.f_bufev->output, 1984 "%zu <%d>%.32s %s%s%s\n", 1985 (size_t)l + strlen(iov[4].iov_base), 1986 f->f_prevpri, (char *)iov[0].iov_base, 1987 IncludeHostname ? LocalHostName : "", 1988 IncludeHostname ? " " : "", 1989 (char *)iov[4].iov_base); 1990 if (l < 0) { 1991 log_debug(" (dropped evbuffer_add_printf)"); 1992 f->f_un.f_forw.f_dropped++; 1993 break; 1994 } 1995 bufferevent_enable(f->f_un.f_forw.f_bufev, EV_WRITE); 1996 log_debug("%s", ""); 1997 break; 1998 1999 case F_CONSOLE: 2000 if (flags & IGN_CONS) { 2001 log_debug(" (ignored)"); 2002 break; 2003 } 2004 /* FALLTHROUGH */ 2005 2006 case F_TTY: 2007 case F_FILE: 2008 case F_PIPE: 2009 log_debug(" %s", f->f_un.f_fname); 2010 if (f->f_type != F_FILE && f->f_type != F_PIPE) { 2011 v->iov_base = "\r\n"; 2012 v->iov_len = 2; 2013 } else { 2014 v->iov_base = "\n"; 2015 v->iov_len = 1; 2016 } 2017 retryonce = 0; 2018 again: 2019 if (writev(f->f_file, iov, 6) < 0) { 2020 int e = errno; 2021 2022 /* pipe is non-blocking. log and drop message if full */ 2023 if (e == EAGAIN && f->f_type == F_PIPE) { 2024 if (now.tv_sec - f->f_lasterrtime > 120) { 2025 f->f_lasterrtime = now.tv_sec; 2026 log_warn("writev \"%s\"", 2027 f->f_un.f_fname); 2028 } 2029 break; 2030 } 2031 2032 (void)close(f->f_file); 2033 /* 2034 * Check for errors on TTY's or program pipes. 2035 * Errors happen due to loss of tty or died programs. 2036 */ 2037 if (e == EAGAIN) { 2038 /* 2039 * Silently drop messages on blocked write. 2040 * This can happen when logging to a locked tty. 2041 */ 2042 break; 2043 } else if ((e == EIO || e == EBADF) && 2044 f->f_type != F_FILE && f->f_type != F_PIPE && 2045 !retryonce) { 2046 f->f_file = priv_open_tty(f->f_un.f_fname); 2047 retryonce = 1; 2048 if (f->f_file < 0) { 2049 f->f_type = F_UNUSED; 2050 log_warn("priv_open_tty \"%s\"", 2051 f->f_un.f_fname); 2052 } else 2053 goto again; 2054 } else if ((e == EPIPE || e == EBADF) && 2055 f->f_type == F_PIPE && !retryonce) { 2056 f->f_file = priv_open_log(f->f_un.f_fname); 2057 retryonce = 1; 2058 if (f->f_file < 0) { 2059 f->f_type = F_UNUSED; 2060 log_warn("priv_open_log \"%s\"", 2061 f->f_un.f_fname); 2062 } else 2063 goto again; 2064 } else { 2065 f->f_type = F_UNUSED; 2066 f->f_file = -1; 2067 errno = e; 2068 log_warn("writev \"%s\"", f->f_un.f_fname); 2069 } 2070 } else if (flags & SYNC_FILE) 2071 (void)fsync(f->f_file); 2072 break; 2073 2074 case F_USERS: 2075 case F_WALL: 2076 log_debug("%s", ""); 2077 v->iov_base = "\r\n"; 2078 v->iov_len = 2; 2079 wallmsg(f, iov); 2080 break; 2081 2082 case F_MEMBUF: 2083 log_debug("%s", ""); 2084 snprintf(line, sizeof(line), "%.32s %s %s", 2085 (char *)iov[0].iov_base, (char *)iov[2].iov_base, 2086 (char *)iov[4].iov_base); 2087 if (ringbuf_append_line(f->f_un.f_mb.f_rb, line) == 1) 2088 f->f_un.f_mb.f_overflow = 1; 2089 if (f->f_un.f_mb.f_attached) 2090 ctlconn_logto(line); 2091 break; 2092 } 2093 f->f_prevcount = 0; 2094 } 2095 2096 /* 2097 * WALLMSG -- Write a message to the world at large 2098 * 2099 * Write the specified message to either the entire 2100 * world, or a list of approved users. 2101 */ 2102 void 2103 wallmsg(struct filed *f, struct iovec *iov) 2104 { 2105 struct utmp ut; 2106 char utline[sizeof(ut.ut_line) + 1]; 2107 static int reenter; /* avoid calling ourselves */ 2108 FILE *uf; 2109 int i; 2110 2111 if (reenter++) 2112 return; 2113 if ((uf = priv_open_utmp()) == NULL) { 2114 log_warn("priv_open_utmp"); 2115 reenter = 0; 2116 return; 2117 } 2118 while (fread(&ut, sizeof(ut), 1, uf) == 1) { 2119 if (ut.ut_name[0] == '\0') 2120 continue; 2121 /* must use strncpy since ut_* may not be NUL terminated */ 2122 strncpy(utline, ut.ut_line, sizeof(utline) - 1); 2123 utline[sizeof(utline) - 1] = '\0'; 2124 if (f->f_type == F_WALL) { 2125 ttymsg(iov, 6, utline); 2126 continue; 2127 } 2128 /* should we send the message to this user? */ 2129 for (i = 0; i < MAXUNAMES; i++) { 2130 if (!f->f_un.f_uname[i][0]) 2131 break; 2132 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 2133 UT_NAMESIZE)) { 2134 ttymsg(iov, 6, utline); 2135 break; 2136 } 2137 } 2138 } 2139 (void)fclose(uf); 2140 reenter = 0; 2141 } 2142 2143 /* 2144 * Return a printable representation of a host address. 2145 */ 2146 void 2147 cvthname(struct sockaddr *f, char *result, size_t res_len) 2148 { 2149 if (getnameinfo(f, f->sa_len, result, res_len, NULL, 0, 2150 NI_NUMERICHOST|NI_NUMERICSERV|NI_DGRAM) != 0) { 2151 log_debug("Malformed from address"); 2152 strlcpy(result, hostname_unknown, res_len); 2153 return; 2154 } 2155 log_debug("cvthname(%s)", result); 2156 if (NoDNS) 2157 return; 2158 2159 if (priv_getnameinfo(f, f->sa_len, result, res_len) != 0) 2160 log_debug("Host name for from address (%s) unknown", result); 2161 } 2162 2163 void 2164 die_signalcb(int signum, short event, void *arg) 2165 { 2166 die(signum); 2167 } 2168 2169 void 2170 mark_timercb(int unused, short event, void *arg) 2171 { 2172 struct event *ev = arg; 2173 struct timeval to; 2174 2175 markit(); 2176 2177 to.tv_sec = TIMERINTVL; 2178 to.tv_usec = 0; 2179 evtimer_add(ev, &to); 2180 } 2181 2182 void 2183 init_signalcb(int signum, short event, void *arg) 2184 { 2185 init(); 2186 log_info(LOG_INFO, "restart"); 2187 2188 if (tcpbuf_dropped > 0) { 2189 log_info(LOG_WARNING, "dropped %d message%s to remote loghost", 2190 tcpbuf_dropped, tcpbuf_dropped == 1 ? "" : "s"); 2191 tcpbuf_dropped = 0; 2192 } 2193 log_debug("syslogd: restarted"); 2194 } 2195 2196 void 2197 logevent(int severity, const char *msg) 2198 { 2199 log_debug("libevent: [%d] %s", severity, msg); 2200 } 2201 2202 __dead void 2203 die(int signo) 2204 { 2205 struct filed *f; 2206 int was_initialized = Initialized; 2207 2208 Initialized = 0; /* Don't log SIGCHLDs */ 2209 SIMPLEQ_FOREACH(f, &Files, f_next) { 2210 /* flush any pending output */ 2211 if (f->f_prevcount) 2212 fprintlog(f, 0, (char *)NULL); 2213 if (f->f_type == F_FORWTLS || f->f_type == F_FORWTCP) { 2214 tcpbuf_dropped += f->f_un.f_forw.f_dropped + 2215 tcpbuf_countmsg(f->f_un.f_forw.f_bufev); 2216 f->f_un.f_forw.f_dropped = 0; 2217 } 2218 } 2219 Initialized = was_initialized; 2220 2221 if (tcpbuf_dropped > 0) { 2222 log_info(LOG_WARNING, "dropped %d message%s to remote loghost", 2223 tcpbuf_dropped, tcpbuf_dropped == 1 ? "" : "s"); 2224 tcpbuf_dropped = 0; 2225 } 2226 2227 if (signo) 2228 log_info(LOG_ERR, "exiting on signal %d", signo); 2229 log_debug("syslogd: exited"); 2230 exit(0); 2231 } 2232 2233 /* 2234 * INIT -- Initialize syslogd from configuration table 2235 */ 2236 void 2237 init(void) 2238 { 2239 char progblock[NAME_MAX+1], hostblock[NAME_MAX+1], *cline, *p, *q; 2240 struct filed_list mb; 2241 struct filed *f, *m; 2242 FILE *cf; 2243 int i; 2244 size_t s; 2245 2246 log_debug("init"); 2247 2248 /* If config file has been modified, then just die to restart */ 2249 if (priv_config_modified()) { 2250 log_debug("config file changed: dying"); 2251 die(0); 2252 } 2253 2254 /* 2255 * Close all open log files. 2256 */ 2257 Initialized = 0; 2258 SIMPLEQ_INIT(&mb); 2259 while (!SIMPLEQ_EMPTY(&Files)) { 2260 f = SIMPLEQ_FIRST(&Files); 2261 SIMPLEQ_REMOVE_HEAD(&Files, f_next); 2262 /* flush any pending output */ 2263 if (f->f_prevcount) 2264 fprintlog(f, 0, (char *)NULL); 2265 2266 switch (f->f_type) { 2267 case F_FORWTLS: 2268 if (f->f_un.f_forw.f_ctx) { 2269 tls_close(f->f_un.f_forw.f_ctx); 2270 tls_free(f->f_un.f_forw.f_ctx); 2271 } 2272 free(f->f_un.f_forw.f_host); 2273 /* FALLTHROUGH */ 2274 case F_FORWTCP: 2275 tcpbuf_dropped += f->f_un.f_forw.f_dropped + 2276 tcpbuf_countmsg(f->f_un.f_forw.f_bufev); 2277 bufferevent_free(f->f_un.f_forw.f_bufev); 2278 /* FALLTHROUGH */ 2279 case F_FILE: 2280 case F_TTY: 2281 case F_CONSOLE: 2282 case F_PIPE: 2283 (void)close(f->f_file); 2284 break; 2285 } 2286 free(f->f_program); 2287 free(f->f_hostname); 2288 if (f->f_type == F_MEMBUF) { 2289 f->f_program = NULL; 2290 f->f_hostname = NULL; 2291 log_debug("add %p to mb", f); 2292 SIMPLEQ_INSERT_HEAD(&mb, f, f_next); 2293 } else 2294 free(f); 2295 } 2296 SIMPLEQ_INIT(&Files); 2297 2298 /* open the configuration file */ 2299 if ((cf = priv_open_config()) == NULL) { 2300 log_debug("cannot open %s", ConfFile); 2301 SIMPLEQ_INSERT_TAIL(&Files, 2302 cfline("*.ERR\t/dev/console", "*", "*"), f_next); 2303 SIMPLEQ_INSERT_TAIL(&Files, 2304 cfline("*.PANIC\t*", "*", "*"), f_next); 2305 Initialized = 1; 2306 return; 2307 } 2308 2309 /* 2310 * Foreach line in the conf table, open that file. 2311 */ 2312 cline = NULL; 2313 s = 0; 2314 strlcpy(progblock, "*", sizeof(progblock)); 2315 strlcpy(hostblock, "*", sizeof(hostblock)); 2316 while (getline(&cline, &s, cf) != -1) { 2317 /* 2318 * check for end-of-section, comments, strip off trailing 2319 * spaces and newline character. !progblock and +hostblock 2320 * are treated specially: the following lines apply only to 2321 * that program. 2322 */ 2323 for (p = cline; isspace((unsigned char)*p); ++p) 2324 continue; 2325 if (*p == '\0' || *p == '#') 2326 continue; 2327 if (*p == '!' || *p == '+') { 2328 q = (*p == '!') ? progblock : hostblock; 2329 p++; 2330 while (isspace((unsigned char)*p)) 2331 p++; 2332 if (*p == '\0' || (*p == '*' && (p[1] == '\0' || 2333 isspace((unsigned char)p[1])))) { 2334 strlcpy(q, "*", NAME_MAX+1); 2335 continue; 2336 } 2337 for (i = 0; i < NAME_MAX; i++) { 2338 if (*p == '\0' || isspace((unsigned char)*p)) 2339 break; 2340 *q++ = *p++; 2341 } 2342 *q = '\0'; 2343 continue; 2344 } 2345 2346 p = cline + strlen(cline); 2347 while (p > cline) 2348 if (!isspace((unsigned char)*--p)) { 2349 p++; 2350 break; 2351 } 2352 *p = '\0'; 2353 f = cfline(cline, progblock, hostblock); 2354 if (f != NULL) 2355 SIMPLEQ_INSERT_TAIL(&Files, f, f_next); 2356 } 2357 free(cline); 2358 if (!feof(cf)) 2359 fatal("read config file"); 2360 2361 /* Match and initialize the memory buffers */ 2362 SIMPLEQ_FOREACH(f, &Files, f_next) { 2363 if (f->f_type != F_MEMBUF) 2364 continue; 2365 log_debug("Initialize membuf %s at %p", 2366 f->f_un.f_mb.f_mname, f); 2367 2368 SIMPLEQ_FOREACH(m, &mb, f_next) { 2369 if (m->f_un.f_mb.f_rb == NULL) 2370 continue; 2371 if (strcmp(m->f_un.f_mb.f_mname, 2372 f->f_un.f_mb.f_mname) == 0) 2373 break; 2374 } 2375 if (m == NULL) { 2376 log_debug("Membuf no match"); 2377 f->f_un.f_mb.f_rb = ringbuf_init(f->f_un.f_mb.f_len); 2378 if (f->f_un.f_mb.f_rb == NULL) { 2379 f->f_type = F_UNUSED; 2380 log_warn("allocate membuf"); 2381 } 2382 } else { 2383 log_debug("Membuf match f:%p, m:%p", f, m); 2384 f->f_un = m->f_un; 2385 m->f_un.f_mb.f_rb = NULL; 2386 } 2387 } 2388 2389 /* make sure remaining buffers are freed */ 2390 while (!SIMPLEQ_EMPTY(&mb)) { 2391 m = SIMPLEQ_FIRST(&mb); 2392 SIMPLEQ_REMOVE_HEAD(&mb, f_next); 2393 if (m->f_un.f_mb.f_rb != NULL) { 2394 log_warnx("mismatched membuf"); 2395 ringbuf_free(m->f_un.f_mb.f_rb); 2396 } 2397 log_debug("Freeing membuf %p", m); 2398 2399 free(m); 2400 } 2401 2402 /* close the configuration file */ 2403 (void)fclose(cf); 2404 2405 Initialized = 1; 2406 2407 if (Debug) { 2408 SIMPLEQ_FOREACH(f, &Files, f_next) { 2409 for (i = 0; i <= LOG_NFACILITIES; i++) 2410 if (f->f_pmask[i] == INTERNAL_NOPRI) 2411 printf("X "); 2412 else 2413 printf("%d ", f->f_pmask[i]); 2414 printf("%s: ", TypeNames[f->f_type]); 2415 switch (f->f_type) { 2416 case F_FILE: 2417 case F_TTY: 2418 case F_CONSOLE: 2419 case F_PIPE: 2420 printf("%s", f->f_un.f_fname); 2421 break; 2422 2423 case F_FORWUDP: 2424 case F_FORWTCP: 2425 case F_FORWTLS: 2426 printf("%s", f->f_un.f_forw.f_loghost); 2427 break; 2428 2429 case F_USERS: 2430 for (i = 0; i < MAXUNAMES && 2431 *f->f_un.f_uname[i]; i++) 2432 printf("%s, ", f->f_un.f_uname[i]); 2433 break; 2434 2435 case F_MEMBUF: 2436 printf("%s", f->f_un.f_mb.f_mname); 2437 break; 2438 2439 } 2440 if (f->f_program || f->f_hostname) 2441 printf(" (%s, %s)", 2442 f->f_program ? f->f_program : "*", 2443 f->f_hostname ? f->f_hostname : "*"); 2444 printf("\n"); 2445 } 2446 } 2447 } 2448 2449 #define progmatches(p1, p2) \ 2450 (p1 == p2 || (p1 != NULL && p2 != NULL && strcmp(p1, p2) == 0)) 2451 2452 /* 2453 * Spot a line with a duplicate file, pipe, console, tty, or membuf target. 2454 */ 2455 struct filed * 2456 find_dup(struct filed *f) 2457 { 2458 struct filed *list; 2459 2460 SIMPLEQ_FOREACH(list, &Files, f_next) { 2461 if (list->f_quick || f->f_quick) 2462 continue; 2463 switch (list->f_type) { 2464 case F_FILE: 2465 case F_TTY: 2466 case F_CONSOLE: 2467 case F_PIPE: 2468 if (strcmp(list->f_un.f_fname, f->f_un.f_fname) == 0 && 2469 progmatches(list->f_program, f->f_program) && 2470 progmatches(list->f_hostname, f->f_hostname)) { 2471 log_debug("duplicate %s", f->f_un.f_fname); 2472 return (list); 2473 } 2474 break; 2475 case F_MEMBUF: 2476 if (strcmp(list->f_un.f_mb.f_mname, 2477 f->f_un.f_mb.f_mname) == 0 && 2478 progmatches(list->f_program, f->f_program) && 2479 progmatches(list->f_hostname, f->f_hostname)) { 2480 log_debug("duplicate membuf %s", 2481 f->f_un.f_mb.f_mname); 2482 return (list); 2483 } 2484 break; 2485 } 2486 } 2487 return (NULL); 2488 } 2489 2490 /* 2491 * Crack a configuration file line 2492 */ 2493 struct filed * 2494 cfline(char *line, char *progblock, char *hostblock) 2495 { 2496 int i, pri; 2497 size_t rb_len; 2498 char *bp, *p, *q, *proto, *host, *port, *ipproto; 2499 char buf[MAXLINE]; 2500 struct filed *xf, *f, *d; 2501 struct timeval to; 2502 2503 log_debug("cfline(\"%s\", f, \"%s\", \"%s\")", 2504 line, progblock, hostblock); 2505 2506 if ((f = calloc(1, sizeof(*f))) == NULL) 2507 fatal("allocate struct filed"); 2508 for (i = 0; i <= LOG_NFACILITIES; i++) 2509 f->f_pmask[i] = INTERNAL_NOPRI; 2510 2511 /* save program name if any */ 2512 f->f_quick = 0; 2513 if (*progblock == '!') { 2514 progblock++; 2515 f->f_quick = 1; 2516 } 2517 if (*hostblock == '+') { 2518 hostblock++; 2519 f->f_quick = 1; 2520 } 2521 if (strcmp(progblock, "*") != 0) 2522 f->f_program = strdup(progblock); 2523 if (strcmp(hostblock, "*") != 0) 2524 f->f_hostname = strdup(hostblock); 2525 2526 /* scan through the list of selectors */ 2527 for (p = line; *p && *p != '\t' && *p != ' ';) { 2528 2529 /* find the end of this facility name list */ 2530 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2531 continue; 2532 2533 /* collect priority name */ 2534 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2535 *bp++ = *q++; 2536 *bp = '\0'; 2537 2538 /* skip cruft */ 2539 while (*q && strchr(",;", *q)) 2540 q++; 2541 2542 /* decode priority name */ 2543 if (*buf == '*') 2544 pri = LOG_PRIMASK + 1; 2545 else { 2546 /* ignore trailing spaces */ 2547 for (i=strlen(buf)-1; i >= 0 && buf[i] == ' '; i--) { 2548 buf[i]='\0'; 2549 } 2550 2551 pri = decode(buf, prioritynames); 2552 if (pri < 0) { 2553 log_warnx("unknown priority name \"%s\"", buf); 2554 free(f); 2555 return (NULL); 2556 } 2557 } 2558 2559 /* scan facilities */ 2560 while (*p && !strchr("\t.; ", *p)) { 2561 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2562 *bp++ = *p++; 2563 *bp = '\0'; 2564 if (*buf == '*') 2565 for (i = 0; i < LOG_NFACILITIES; i++) 2566 f->f_pmask[i] = pri; 2567 else { 2568 i = decode(buf, facilitynames); 2569 if (i < 0) { 2570 log_warnx("unknown facility name " 2571 "\"%s\"", buf); 2572 free(f); 2573 return (NULL); 2574 } 2575 f->f_pmask[i >> 3] = pri; 2576 } 2577 while (*p == ',' || *p == ' ') 2578 p++; 2579 } 2580 2581 p = q; 2582 } 2583 2584 /* skip to action part */ 2585 while (*p == '\t' || *p == ' ') 2586 p++; 2587 2588 switch (*p) { 2589 case '@': 2590 if ((strlcpy(f->f_un.f_forw.f_loghost, p, 2591 sizeof(f->f_un.f_forw.f_loghost)) >= 2592 sizeof(f->f_un.f_forw.f_loghost))) { 2593 log_warnx("loghost too long \"%s\"", p); 2594 break; 2595 } 2596 if (loghost_parse(++p, &proto, &host, &port) == -1) { 2597 log_warnx("bad loghost \"%s\"", 2598 f->f_un.f_forw.f_loghost); 2599 break; 2600 } 2601 if (proto == NULL) 2602 proto = "udp"; 2603 ipproto = proto; 2604 if (strcmp(proto, "udp") == 0) { 2605 if (fd_udp == -1) 2606 proto = "udp6"; 2607 if (fd_udp6 == -1) 2608 proto = "udp4"; 2609 ipproto = proto; 2610 } else if (strcmp(proto, "udp4") == 0) { 2611 if (fd_udp == -1) { 2612 log_warnx("no udp4 \"%s\"", 2613 f->f_un.f_forw.f_loghost); 2614 break; 2615 } 2616 } else if (strcmp(proto, "udp6") == 0) { 2617 if (fd_udp6 == -1) { 2618 log_warnx("no udp6 \"%s\"", 2619 f->f_un.f_forw.f_loghost); 2620 break; 2621 } 2622 } else if (strcmp(proto, "tcp") == 0 || 2623 strcmp(proto, "tcp4") == 0 || strcmp(proto, "tcp6") == 0) { 2624 ; 2625 } else if (strcmp(proto, "tls") == 0) { 2626 ipproto = "tcp"; 2627 } else if (strcmp(proto, "tls4") == 0) { 2628 ipproto = "tcp4"; 2629 } else if (strcmp(proto, "tls6") == 0) { 2630 ipproto = "tcp6"; 2631 } else { 2632 log_warnx("bad protocol \"%s\"", 2633 f->f_un.f_forw.f_loghost); 2634 break; 2635 } 2636 if (strlen(host) >= NI_MAXHOST) { 2637 log_warnx("host too long \"%s\"", 2638 f->f_un.f_forw.f_loghost); 2639 break; 2640 } 2641 if (port == NULL) 2642 port = strncmp(proto, "tls", 3) == 0 ? 2643 "syslog-tls" : "syslog"; 2644 if (strlen(port) >= NI_MAXSERV) { 2645 log_warnx("port too long \"%s\"", 2646 f->f_un.f_forw.f_loghost); 2647 break; 2648 } 2649 if (priv_getaddrinfo(ipproto, host, port, 2650 (struct sockaddr*)&f->f_un.f_forw.f_addr, 2651 sizeof(f->f_un.f_forw.f_addr)) != 0) { 2652 log_warnx("bad hostname \"%s\"", 2653 f->f_un.f_forw.f_loghost); 2654 break; 2655 } 2656 f->f_file = -1; 2657 if (strncmp(proto, "udp", 3) == 0) { 2658 switch (f->f_un.f_forw.f_addr.ss_family) { 2659 case AF_INET: 2660 f->f_file = fd_udp; 2661 break; 2662 case AF_INET6: 2663 f->f_file = fd_udp6; 2664 break; 2665 } 2666 f->f_type = F_FORWUDP; 2667 } else if (strncmp(ipproto, "tcp", 3) == 0) { 2668 if ((f->f_un.f_forw.f_bufev = bufferevent_new(-1, 2669 tcp_dropcb, tcp_writecb, tcp_errorcb, f)) == NULL) { 2670 log_warn("bufferevent \"%s\"", 2671 f->f_un.f_forw.f_loghost); 2672 break; 2673 } 2674 if (strncmp(proto, "tls", 3) == 0) { 2675 f->f_un.f_forw.f_host = strdup(host); 2676 f->f_type = F_FORWTLS; 2677 } else { 2678 f->f_type = F_FORWTCP; 2679 } 2680 /* 2681 * If we try to connect to a TLS server immediately 2682 * syslogd gets an SIGPIPE as the signal handlers have 2683 * not been set up. Delay the connection until the 2684 * event loop is started. We can reuse the write event 2685 * for that as bufferevent is still disabled. 2686 */ 2687 to.tv_sec = 0; 2688 to.tv_usec = 1; 2689 evtimer_set(&f->f_un.f_forw.f_bufev->ev_write, 2690 tcp_connectcb, f); 2691 evtimer_add(&f->f_un.f_forw.f_bufev->ev_write, &to); 2692 } 2693 break; 2694 2695 case '/': 2696 case '|': 2697 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2698 d = find_dup(f); 2699 if (d != NULL) { 2700 for (i = 0; i <= LOG_NFACILITIES; i++) 2701 if (f->f_pmask[i] != INTERNAL_NOPRI) 2702 d->f_pmask[i] = f->f_pmask[i]; 2703 free(f); 2704 return (NULL); 2705 } 2706 if (strcmp(p, ctty) == 0) { 2707 f->f_file = priv_open_tty(p); 2708 if (f->f_file < 0) 2709 log_warn("priv_open_tty \"%s\"", p); 2710 } else { 2711 f->f_file = priv_open_log(p); 2712 if (f->f_file < 0) 2713 log_warn("priv_open_log \"%s\"", p); 2714 } 2715 if (f->f_file < 0) { 2716 f->f_type = F_UNUSED; 2717 break; 2718 } 2719 if (isatty(f->f_file)) { 2720 if (strcmp(p, ctty) == 0) 2721 f->f_type = F_CONSOLE; 2722 else 2723 f->f_type = F_TTY; 2724 } else { 2725 if (*p == '|') 2726 f->f_type = F_PIPE; 2727 else { 2728 f->f_type = F_FILE; 2729 2730 /* Clear O_NONBLOCK flag on f->f_file */ 2731 if ((i = fcntl(f->f_file, F_GETFL)) != -1) { 2732 i &= ~O_NONBLOCK; 2733 fcntl(f->f_file, F_SETFL, i); 2734 } 2735 } 2736 } 2737 break; 2738 2739 case '*': 2740 f->f_type = F_WALL; 2741 break; 2742 2743 case ':': 2744 f->f_type = F_MEMBUF; 2745 2746 /* Parse buffer size (in kb) */ 2747 errno = 0; 2748 rb_len = strtoul(++p, &q, 0); 2749 if (*p == '\0' || (errno == ERANGE && rb_len == ULONG_MAX) || 2750 *q != ':' || rb_len == 0) { 2751 f->f_type = F_UNUSED; 2752 log_warnx("strtoul \"%s\"", p); 2753 break; 2754 } 2755 q++; 2756 rb_len *= 1024; 2757 2758 /* Copy buffer name */ 2759 for(i = 0; (size_t)i < sizeof(f->f_un.f_mb.f_mname) - 1; i++) { 2760 if (!isalnum((unsigned char)q[i])) 2761 break; 2762 f->f_un.f_mb.f_mname[i] = q[i]; 2763 } 2764 2765 /* Make sure buffer name is unique */ 2766 xf = find_dup(f); 2767 2768 /* Error on missing or non-unique name, or bad buffer length */ 2769 if (i == 0 || rb_len > MAX_MEMBUF || xf != NULL) { 2770 f->f_type = F_UNUSED; 2771 log_warnx("find_dup \"%s\"", p); 2772 break; 2773 } 2774 2775 /* Set buffer length */ 2776 rb_len = MAXIMUM(rb_len, MIN_MEMBUF); 2777 f->f_un.f_mb.f_len = rb_len; 2778 f->f_un.f_mb.f_overflow = 0; 2779 f->f_un.f_mb.f_attached = 0; 2780 break; 2781 2782 default: 2783 for (i = 0; i < MAXUNAMES && *p; i++) { 2784 for (q = p; *q && *q != ','; ) 2785 q++; 2786 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 2787 if ((q - p) > UT_NAMESIZE) 2788 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 2789 else 2790 f->f_un.f_uname[i][q - p] = '\0'; 2791 while (*q == ',' || *q == ' ') 2792 q++; 2793 p = q; 2794 } 2795 f->f_type = F_USERS; 2796 break; 2797 } 2798 return (f); 2799 } 2800 2801 /* 2802 * Parse the host and port parts from a loghost string. 2803 */ 2804 int 2805 loghost_parse(char *str, char **proto, char **host, char **port) 2806 { 2807 char *prefix = NULL; 2808 2809 if ((*host = strchr(str, ':')) && 2810 (*host)[1] == '/' && (*host)[2] == '/') { 2811 prefix = str; 2812 **host = '\0'; 2813 str = *host + 3; 2814 } 2815 if (proto) 2816 *proto = prefix; 2817 else if (prefix) 2818 return (-1); 2819 2820 *host = str; 2821 if (**host == '[') { 2822 (*host)++; 2823 str = strchr(*host, ']'); 2824 if (str == NULL) 2825 return (-1); 2826 *str++ = '\0'; 2827 } 2828 *port = strrchr(str, ':'); 2829 if (*port != NULL) 2830 *(*port)++ = '\0'; 2831 2832 return (0); 2833 } 2834 2835 /* 2836 * Retrieve the size of the kernel message buffer, via sysctl. 2837 */ 2838 int 2839 getmsgbufsize(void) 2840 { 2841 int msgbufsize, mib[2]; 2842 size_t size; 2843 2844 mib[0] = CTL_KERN; 2845 mib[1] = KERN_MSGBUFSIZE; 2846 size = sizeof msgbufsize; 2847 if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) { 2848 log_debug("couldn't get kern.msgbufsize"); 2849 return (0); 2850 } 2851 return (msgbufsize); 2852 } 2853 2854 /* 2855 * Decode a symbolic name to a numeric value 2856 */ 2857 int 2858 decode(const char *name, const CODE *codetab) 2859 { 2860 const CODE *c; 2861 char *p, buf[40]; 2862 2863 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2864 if (isupper((unsigned char)*name)) 2865 *p = tolower((unsigned char)*name); 2866 else 2867 *p = *name; 2868 } 2869 *p = '\0'; 2870 for (c = codetab; c->c_name; c++) 2871 if (!strcmp(buf, c->c_name)) 2872 return (c->c_val); 2873 2874 return (-1); 2875 } 2876 2877 void 2878 markit(void) 2879 { 2880 struct filed *f; 2881 2882 (void)gettimeofday(&now, NULL); 2883 MarkSeq += TIMERINTVL; 2884 if (MarkSeq >= MarkInterval) { 2885 logline(LOG_INFO, ADDDATE|MARK, LocalHostName, "-- MARK --"); 2886 MarkSeq = 0; 2887 } 2888 2889 SIMPLEQ_FOREACH(f, &Files, f_next) { 2890 if (f->f_prevcount && now.tv_sec >= REPEATTIME(f)) { 2891 log_debug("flush %s: repeated %d times, %d sec", 2892 TypeNames[f->f_type], f->f_prevcount, 2893 repeatinterval[f->f_repeatcount]); 2894 fprintlog(f, 0, (char *)NULL); 2895 BACKOFF(f); 2896 } 2897 } 2898 } 2899 2900 int 2901 unix_socket(char *path, int type, mode_t mode) 2902 { 2903 struct sockaddr_un s_un; 2904 int fd, optval; 2905 mode_t old_umask; 2906 2907 memset(&s_un, 0, sizeof(s_un)); 2908 s_un.sun_family = AF_UNIX; 2909 if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >= 2910 sizeof(s_un.sun_path)) { 2911 log_warnx("socket path too long \"%s\"", path); 2912 return (-1); 2913 } 2914 2915 if ((fd = socket(AF_UNIX, type, 0)) == -1) { 2916 log_warn("socket unix \"%s\"", path); 2917 return (-1); 2918 } 2919 2920 if (Debug) { 2921 if (connect(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == 0 || 2922 errno == EPROTOTYPE) { 2923 close(fd); 2924 errno = EISCONN; 2925 log_warn("connect unix \"%s\"", path); 2926 return (-1); 2927 } 2928 } 2929 2930 old_umask = umask(0177); 2931 2932 unlink(path); 2933 if (bind(fd, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) { 2934 log_warn("bind unix \"%s\"", path); 2935 umask(old_umask); 2936 close(fd); 2937 return (-1); 2938 } 2939 2940 umask(old_umask); 2941 2942 if (chmod(path, mode) == -1) { 2943 log_warn("chmod unix \"%s\"", path); 2944 close(fd); 2945 unlink(path); 2946 return (-1); 2947 } 2948 2949 optval = MAXLINE + PATH_MAX; 2950 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &optval, sizeof(optval)) 2951 == -1) 2952 log_warn("setsockopt unix \"%s\"", path); 2953 2954 return (fd); 2955 } 2956 2957 void 2958 double_sockbuf(int fd, int optname) 2959 { 2960 socklen_t len; 2961 int i, newsize, oldsize = 0; 2962 2963 len = sizeof(oldsize); 2964 if (getsockopt(fd, SOL_SOCKET, optname, &oldsize, &len) == -1) 2965 log_warn("getsockopt bufsize"); 2966 len = sizeof(newsize); 2967 newsize = MAXLINE + 128; /* data + control */ 2968 /* allow 8 full length messages */ 2969 for (i = 0; i < 4; i++, newsize *= 2) { 2970 if (newsize <= oldsize) 2971 continue; 2972 if (setsockopt(fd, SOL_SOCKET, optname, &newsize, len) == -1) 2973 log_warn("setsockopt bufsize %d", newsize); 2974 } 2975 } 2976 2977 void 2978 set_sockbuf(int fd) 2979 { 2980 int size = 65536; 2981 2982 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) == -1) 2983 log_warn("setsockopt sndbufsize %d", size); 2984 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)) == -1) 2985 log_warn("setsockopt rcvbufsize %d", size); 2986 } 2987 2988 void 2989 ctlconn_cleanup(void) 2990 { 2991 struct filed *f; 2992 2993 close(fd_ctlconn); 2994 fd_ctlconn = -1; 2995 event_del(ev_ctlread); 2996 event_del(ev_ctlwrite); 2997 event_add(ev_ctlaccept, NULL); 2998 2999 if (ctl_state == CTL_WRITING_CONT_REPLY) 3000 SIMPLEQ_FOREACH(f, &Files, f_next) 3001 if (f->f_type == F_MEMBUF) 3002 f->f_un.f_mb.f_attached = 0; 3003 3004 ctl_state = ctl_cmd_bytes = ctl_reply_offset = ctl_reply_size = 0; 3005 } 3006 3007 void 3008 ctlsock_acceptcb(int fd, short event, void *arg) 3009 { 3010 struct event *ev = arg; 3011 3012 if ((fd = reserve_accept4(fd, event, ev, ctlsock_acceptcb, 3013 NULL, NULL, SOCK_NONBLOCK)) == -1) { 3014 if (errno != ENFILE && errno != EMFILE && 3015 errno != EINTR && errno != EWOULDBLOCK && 3016 errno != ECONNABORTED) 3017 log_warn("accept control socket"); 3018 return; 3019 } 3020 log_debug("Accepting control connection"); 3021 3022 if (fd_ctlconn != -1) 3023 ctlconn_cleanup(); 3024 3025 /* Only one connection at a time */ 3026 event_del(ev); 3027 3028 fd_ctlconn = fd; 3029 /* file descriptor has changed, reset event */ 3030 event_set(ev_ctlread, fd_ctlconn, EV_READ|EV_PERSIST, 3031 ctlconn_readcb, ev_ctlread); 3032 event_set(ev_ctlwrite, fd_ctlconn, EV_WRITE|EV_PERSIST, 3033 ctlconn_writecb, ev_ctlwrite); 3034 event_add(ev_ctlread, NULL); 3035 ctl_state = CTL_READING_CMD; 3036 ctl_cmd_bytes = 0; 3037 } 3038 3039 static struct filed 3040 *find_membuf_log(const char *name) 3041 { 3042 struct filed *f; 3043 3044 SIMPLEQ_FOREACH(f, &Files, f_next) { 3045 if (f->f_type == F_MEMBUF && 3046 strcmp(f->f_un.f_mb.f_mname, name) == 0) 3047 break; 3048 } 3049 return (f); 3050 } 3051 3052 void 3053 ctlconn_readcb(int fd, short event, void *arg) 3054 { 3055 struct filed *f; 3056 struct ctl_reply_hdr *reply_hdr = (struct ctl_reply_hdr *)ctl_reply; 3057 ssize_t n; 3058 u_int32_t flags = 0; 3059 3060 if (ctl_state == CTL_WRITING_REPLY || 3061 ctl_state == CTL_WRITING_CONT_REPLY) { 3062 /* client has closed the connection */ 3063 ctlconn_cleanup(); 3064 return; 3065 } 3066 3067 retry: 3068 n = read(fd, (char*)&ctl_cmd + ctl_cmd_bytes, 3069 sizeof(ctl_cmd) - ctl_cmd_bytes); 3070 switch (n) { 3071 case -1: 3072 if (errno == EINTR) 3073 goto retry; 3074 if (errno == EWOULDBLOCK) 3075 return; 3076 log_warn("read control socket"); 3077 /* FALLTHROUGH */ 3078 case 0: 3079 ctlconn_cleanup(); 3080 return; 3081 default: 3082 ctl_cmd_bytes += n; 3083 } 3084 if (ctl_cmd_bytes < sizeof(ctl_cmd)) 3085 return; 3086 3087 if (ntohl(ctl_cmd.version) != CTL_VERSION) { 3088 log_warnx("unknown client protocol version"); 3089 ctlconn_cleanup(); 3090 return; 3091 } 3092 3093 /* Ensure that logname is \0 terminated */ 3094 if (memchr(ctl_cmd.logname, '\0', sizeof(ctl_cmd.logname)) == NULL) { 3095 log_warnx("corrupt control socket command"); 3096 ctlconn_cleanup(); 3097 return; 3098 } 3099 3100 *reply_text = '\0'; 3101 3102 ctl_reply_size = ctl_reply_offset = 0; 3103 memset(reply_hdr, '\0', sizeof(*reply_hdr)); 3104 3105 ctl_cmd.cmd = ntohl(ctl_cmd.cmd); 3106 log_debug("ctlcmd %x logname \"%s\"", ctl_cmd.cmd, ctl_cmd.logname); 3107 3108 switch (ctl_cmd.cmd) { 3109 case CMD_READ: 3110 case CMD_READ_CLEAR: 3111 case CMD_READ_CONT: 3112 case CMD_FLAGS: 3113 f = find_membuf_log(ctl_cmd.logname); 3114 if (f == NULL) { 3115 strlcpy(reply_text, "No such log\n", MAX_MEMBUF); 3116 } else { 3117 if (ctl_cmd.cmd != CMD_FLAGS) { 3118 ringbuf_to_string(reply_text, MAX_MEMBUF, 3119 f->f_un.f_mb.f_rb); 3120 } 3121 if (f->f_un.f_mb.f_overflow) 3122 flags |= CTL_HDR_FLAG_OVERFLOW; 3123 if (ctl_cmd.cmd == CMD_READ_CLEAR) { 3124 ringbuf_clear(f->f_un.f_mb.f_rb); 3125 f->f_un.f_mb.f_overflow = 0; 3126 } 3127 if (ctl_cmd.cmd == CMD_READ_CONT) { 3128 f->f_un.f_mb.f_attached = 1; 3129 tailify_replytext(reply_text, 3130 ctl_cmd.lines > 0 ? ctl_cmd.lines : 10); 3131 } else if (ctl_cmd.lines > 0) { 3132 tailify_replytext(reply_text, ctl_cmd.lines); 3133 } 3134 } 3135 break; 3136 case CMD_CLEAR: 3137 f = find_membuf_log(ctl_cmd.logname); 3138 if (f == NULL) { 3139 strlcpy(reply_text, "No such log\n", MAX_MEMBUF); 3140 } else { 3141 ringbuf_clear(f->f_un.f_mb.f_rb); 3142 if (f->f_un.f_mb.f_overflow) 3143 flags |= CTL_HDR_FLAG_OVERFLOW; 3144 f->f_un.f_mb.f_overflow = 0; 3145 strlcpy(reply_text, "Log cleared\n", MAX_MEMBUF); 3146 } 3147 break; 3148 case CMD_LIST: 3149 SIMPLEQ_FOREACH(f, &Files, f_next) { 3150 if (f->f_type == F_MEMBUF) { 3151 strlcat(reply_text, f->f_un.f_mb.f_mname, 3152 MAX_MEMBUF); 3153 if (f->f_un.f_mb.f_overflow) { 3154 strlcat(reply_text, "*", MAX_MEMBUF); 3155 flags |= CTL_HDR_FLAG_OVERFLOW; 3156 } 3157 strlcat(reply_text, " ", MAX_MEMBUF); 3158 } 3159 } 3160 strlcat(reply_text, "\n", MAX_MEMBUF); 3161 break; 3162 default: 3163 log_warnx("unsupported control socket command"); 3164 ctlconn_cleanup(); 3165 return; 3166 } 3167 reply_hdr->version = htonl(CTL_VERSION); 3168 reply_hdr->flags = htonl(flags); 3169 3170 ctl_reply_size = CTL_REPLY_SIZE; 3171 log_debug("ctlcmd reply length %lu", (u_long)ctl_reply_size); 3172 3173 /* Otherwise, set up to write out reply */ 3174 ctl_state = (ctl_cmd.cmd == CMD_READ_CONT) ? 3175 CTL_WRITING_CONT_REPLY : CTL_WRITING_REPLY; 3176 3177 event_add(ev_ctlwrite, NULL); 3178 3179 /* another syslogc can kick us out */ 3180 if (ctl_state == CTL_WRITING_CONT_REPLY) 3181 event_add(ev_ctlaccept, NULL); 3182 } 3183 3184 void 3185 ctlconn_writecb(int fd, short event, void *arg) 3186 { 3187 struct event *ev = arg; 3188 ssize_t n; 3189 3190 if (!(ctl_state == CTL_WRITING_REPLY || 3191 ctl_state == CTL_WRITING_CONT_REPLY)) { 3192 /* Shouldn't be here! */ 3193 log_warnx("control socket write with bad state"); 3194 ctlconn_cleanup(); 3195 return; 3196 } 3197 3198 retry: 3199 n = write(fd, ctl_reply + ctl_reply_offset, 3200 ctl_reply_size - ctl_reply_offset); 3201 switch (n) { 3202 case -1: 3203 if (errno == EINTR) 3204 goto retry; 3205 if (errno == EWOULDBLOCK) 3206 return; 3207 if (errno != EPIPE) 3208 log_warn("write control socket"); 3209 /* FALLTHROUGH */ 3210 case 0: 3211 ctlconn_cleanup(); 3212 return; 3213 default: 3214 ctl_reply_offset += n; 3215 } 3216 if (ctl_reply_offset < ctl_reply_size) 3217 return; 3218 3219 if (ctl_state != CTL_WRITING_CONT_REPLY) { 3220 ctlconn_cleanup(); 3221 return; 3222 } 3223 3224 /* 3225 * Make space in the buffer for continous writes. 3226 * Set offset behind reply header to skip it 3227 */ 3228 *reply_text = '\0'; 3229 ctl_reply_offset = ctl_reply_size = CTL_REPLY_SIZE; 3230 3231 /* Now is a good time to report dropped lines */ 3232 if (membuf_drop) { 3233 strlcat(reply_text, "<ENOBUFS>\n", MAX_MEMBUF); 3234 ctl_reply_size = CTL_REPLY_SIZE; 3235 membuf_drop = 0; 3236 } else { 3237 /* Nothing left to write */ 3238 event_del(ev); 3239 } 3240 } 3241 3242 /* Shorten replytext to number of lines */ 3243 void 3244 tailify_replytext(char *replytext, int lines) 3245 { 3246 char *start, *nl; 3247 int count = 0; 3248 start = nl = replytext; 3249 3250 while ((nl = strchr(nl, '\n')) != NULL) { 3251 nl++; 3252 if (++count > lines) { 3253 start = strchr(start, '\n'); 3254 start++; 3255 } 3256 } 3257 if (start != replytext) { 3258 int len = strlen(start); 3259 memmove(replytext, start, len); 3260 *(replytext + len) = '\0'; 3261 } 3262 } 3263 3264 void 3265 ctlconn_logto(char *line) 3266 { 3267 size_t l; 3268 3269 if (membuf_drop) 3270 return; 3271 3272 l = strlen(line); 3273 if (l + 2 > (CTL_REPLY_MAXSIZE - ctl_reply_size)) { 3274 /* remember line drops for later report */ 3275 membuf_drop = 1; 3276 return; 3277 } 3278 memcpy(ctl_reply + ctl_reply_size, line, l); 3279 memcpy(ctl_reply + ctl_reply_size + l, "\n", 2); 3280 ctl_reply_size += l + 1; 3281 event_add(ev_ctlwrite, NULL); 3282 } 3283