syslogd.c revision 122815
1116491Sharti/* 2116491Sharti * Copyright (c) 1983, 1988, 1993, 1994 3116491Sharti * The Regents of the University of California. All rights reserved. 4116491Sharti * 5116491Sharti * Redistribution and use in source and binary forms, with or without 6116491Sharti * modification, are permitted provided that the following conditions 7116491Sharti * are met: 8116491Sharti * 1. Redistributions of source code must retain the above copyright 9116491Sharti * notice, this list of conditions and the following disclaimer. 10116491Sharti * 2. Redistributions in binary form must reproduce the above copyright 11116491Sharti * notice, this list of conditions and the following disclaimer in the 12116491Sharti * documentation and/or other materials provided with the distribution. 13116491Sharti * 3. All advertising materials mentioning features or use of this software 14116491Sharti * must display the following acknowledgement: 15116491Sharti * This product includes software developed by the University of 16116491Sharti * California, Berkeley and its contributors. 17116491Sharti * 4. Neither the name of the University nor the names of its contributors 18116491Sharti * may be used to endorse or promote products derived from this software 19116491Sharti * without specific prior written permission. 20116491Sharti * 21116491Sharti * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22116491Sharti * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23116491Sharti * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24116491Sharti * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25116491Sharti * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26116491Sharti * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27116491Sharti * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28116491Sharti * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29116491Sharti * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30116491Sharti * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31116491Sharti * SUCH DAMAGE. 32116491Sharti */ 33116491Sharti 34116519Sharti#ifndef lint 35116519Shartistatic const char copyright[] = 36116519Sharti"@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 37116491Sharti The Regents of the University of California. All rights reserved.\n"; 38116491Sharti#endif /* not lint */ 39116491Sharti 40116491Sharti#ifndef lint 41116491Sharti#if 0 42116491Shartistatic char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 43116491Sharti#endif 44116491Sharti#endif /* not lint */ 45116491Sharti 46116491Sharti#include <sys/cdefs.h> 47116491Sharti__FBSDID("$FreeBSD: head/usr.sbin/syslogd/syslogd.c 122815 2003-11-16 21:51:06Z dwmalone $"); 48116491Sharti 49116491Sharti/* 50116491Sharti * syslogd -- log system messages 51116491Sharti * 52116491Sharti * This program implements a system log. It takes a series of lines. 53116491Sharti * Each line may have a priority, signified as "<n>" as 54116491Sharti * the first characters of the line. If this is 55116491Sharti * not present, a default priority is used. 56116491Sharti * 57116491Sharti * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 58116491Sharti * cause it to reread its configuration file. 59116491Sharti * 60116491Sharti * Defined Constants: 61116491Sharti * 62116491Sharti * MAXLINE -- the maximimum line length that can be handled. 63116491Sharti * DEFUPRI -- the default priority for user messages 64116491Sharti * DEFSPRI -- the default priority for kernel messages 65116491Sharti * 66116491Sharti * Author: Eric Allman 67116491Sharti * extensive changes by Ralph Campbell 68116491Sharti * more extensive changes by Eric Allman (again) 69116491Sharti * Extension to log by program name as well as facility and priority 70116491Sharti * by Peter da Silva. 71116491Sharti * -u and -v by Harlan Stenn. 72116491Sharti * Priority comparison code by Harlan Stenn. 73119280Simp */ 74119280Simp 75116491Sharti#define MAXLINE 1024 /* maximum line length */ 76116491Sharti#define MAXSVLINE 120 /* maximum saved line length */ 77116491Sharti#define DEFUPRI (LOG_USER|LOG_NOTICE) 78116491Sharti#define DEFSPRI (LOG_KERN|LOG_CRIT) 79116491Sharti#define TIMERINTVL 30 /* interval for checking flush, mark */ 80116491Sharti#define TTYMSGTIME 1 /* timed out passed to ttymsg */ 81116491Sharti 82116491Sharti#include <sys/param.h> 83116491Sharti#include <sys/ioctl.h> 84116491Sharti#include <sys/stat.h> 85116491Sharti#include <sys/wait.h> 86116491Sharti#include <sys/socket.h> 87116491Sharti#include <sys/queue.h> 88116491Sharti#include <sys/uio.h> 89116491Sharti#include <sys/un.h> 90116491Sharti#include <sys/time.h> 91116491Sharti#include <sys/resource.h> 92116491Sharti#include <sys/syslimits.h> 93116491Sharti#include <sys/types.h> 94116491Sharti 95116491Sharti#include <netinet/in.h> 96116491Sharti#include <netdb.h> 97116491Sharti#include <arpa/inet.h> 98116491Sharti 99116491Sharti#include <ctype.h> 100116491Sharti#include <err.h> 101116491Sharti#include <errno.h> 102116491Sharti#include <fcntl.h> 103116491Sharti#include <libutil.h> 104116491Sharti#include <limits.h> 105116491Sharti#include <paths.h> 106116491Sharti#include <signal.h> 107116491Sharti#include <stdio.h> 108116491Sharti#include <stdlib.h> 109116491Sharti#include <string.h> 110116491Sharti#include <sysexits.h> 111116491Sharti#include <unistd.h> 112116491Sharti#include <utmp.h> 113116491Sharti 114116491Sharti#include "pathnames.h" 115116491Sharti#include "ttymsg.h" 116116491Sharti 117116491Sharti#define SYSLOG_NAMES 118116491Sharti#include <sys/syslog.h> 119116491Sharti 120116491Sharti#ifdef NI_WITHSCOPEID 121116491Shartistatic const int withscopeid = NI_WITHSCOPEID; 122116491Sharti#else 123116491Shartistatic const int withscopeid; 124116491Sharti#endif 125116491Sharti 126116491Sharticonst char *ConfFile = _PATH_LOGCONF; 127116491Sharticonst char *PidFile = _PATH_LOGPID; 128116491Sharticonst char ctty[] = _PATH_CONSOLE; 129116491Sharti 130116491Sharti#define dprintf if (Debug) printf 131116491Sharti 132116491Sharti#define MAXUNAMES 20 /* maximum number of user names */ 133116491Sharti 134116491Sharti#define MAXFUNIX 20 135116491Sharti 136116491Shartiint nfunix = 1; 137116491Sharticonst char *funixn[MAXFUNIX] = { _PATH_LOG }; 138116491Shartiint funix[MAXFUNIX]; 139116491Sharti 140116491Sharti/* 141116491Sharti * Flags to logmsg(). 142116491Sharti */ 143116491Sharti 144116491Sharti#define IGN_CONS 0x001 /* don't print on console */ 145116491Sharti#define SYNC_FILE 0x002 /* do fsync on file after printing */ 146116491Sharti#define ADDDATE 0x004 /* add a date to the message */ 147116491Sharti#define MARK 0x008 /* this message is a mark */ 148116491Sharti#define ISKERNEL 0x010 /* kernel generated message */ 149116491Sharti 150116491Sharti/* 151116491Sharti * This structure represents the files that will have log 152116491Sharti * copies printed. 153116491Sharti */ 154116491Sharti 155116491Shartistruct filed { 156116491Sharti struct filed *f_next; /* next in linked list */ 157116491Sharti short f_type; /* entry type, see below */ 158116491Sharti short f_file; /* file descriptor */ 159116491Sharti time_t f_time; /* time this was last written */ 160116491Sharti char *f_host; /* host from which to recd. */ 161116491Sharti u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 162116491Sharti u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 163116491Sharti#define PRI_LT 0x1 164116491Sharti#define PRI_EQ 0x2 165116491Sharti#define PRI_GT 0x4 166116491Sharti char *f_program; /* program this applies to */ 167116491Sharti union { 168116491Sharti char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 169116491Sharti struct { 170116491Sharti char f_hname[MAXHOSTNAMELEN]; 171116491Sharti struct addrinfo *f_addr; 172116491Sharti 173116491Sharti } f_forw; /* forwarding address */ 174116491Sharti char f_fname[MAXPATHLEN]; 175116491Sharti struct { 176116491Sharti char f_pname[MAXPATHLEN]; 177116491Sharti pid_t f_pid; 178116491Sharti } f_pipe; 179116491Sharti } f_un; 180116491Sharti char f_prevline[MAXSVLINE]; /* last message logged */ 181116491Sharti char f_lasttime[16]; /* time of last occurrence */ 182116491Sharti char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 183116491Sharti int f_prevpri; /* pri of f_prevline */ 184116491Sharti int f_prevlen; /* length of f_prevline */ 185116491Sharti int f_prevcount; /* repetition cnt of prevline */ 186116491Sharti u_int f_repeatcount; /* number of "repeated" msgs */ 187116491Sharti}; 188116491Sharti 189116491Sharti/* 190116491Sharti * Queue of about-to-be dead processes we should watch out for. 191116491Sharti */ 192116491Sharti 193116491ShartiTAILQ_HEAD(stailhead, deadq_entry) deadq_head; 194116491Shartistruct stailhead *deadq_headp; 195116491Sharti 196116491Shartistruct deadq_entry { 197116491Sharti pid_t dq_pid; 198116491Sharti int dq_timeout; 199116491Sharti TAILQ_ENTRY(deadq_entry) dq_entries; 200116491Sharti}; 201116491Sharti 202116491Sharti/* 203116491Sharti * The timeout to apply to processes waiting on the dead queue. Unit 204116491Sharti * of measure is `mark intervals', i.e. 20 minutes by default. 205116491Sharti * Processes on the dead queue will be terminated after that time. 206116491Sharti */ 207116491Sharti 208116491Sharti#define DQ_TIMO_INIT 2 209116491Sharti 210116491Shartitypedef struct deadq_entry *dq_t; 211116491Sharti 212116491Sharti 213116491Sharti/* 214116491Sharti * Struct to hold records of network addresses that are allowed to log 215116491Sharti * to us. 216116491Sharti */ 217116491Shartistruct allowedpeer { 218116491Sharti int isnumeric; 219116491Sharti u_short port; 220116491Sharti union { 221116491Sharti struct { 222116491Sharti struct sockaddr_storage addr; 223116491Sharti struct sockaddr_storage mask; 224116491Sharti } numeric; 225116491Sharti char *name; 226116491Sharti } u; 227116491Sharti#define a_addr u.numeric.addr 228116491Sharti#define a_mask u.numeric.mask 229116491Sharti#define a_name u.name 230116491Sharti}; 231116491Sharti 232116491Sharti 233116491Sharti/* 234116491Sharti * Intervals at which we flush out "message repeated" messages, 235116491Sharti * in seconds after previous message is logged. After each flush, 236116491Sharti * we move to the next interval until we reach the largest. 237116491Sharti */ 238116491Shartiint repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 239116491Sharti#define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 240116491Sharti#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 241116491Sharti#define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 242116491Sharti (f)->f_repeatcount = MAXREPEAT; \ 243116491Sharti } 244116491Sharti 245116491Sharti/* values for f_type */ 246116491Sharti#define F_UNUSED 0 /* unused entry */ 247116491Sharti#define F_FILE 1 /* regular file */ 248116491Sharti#define F_TTY 2 /* terminal */ 249116491Sharti#define F_CONSOLE 3 /* console terminal */ 250116491Sharti#define F_FORW 4 /* remote machine */ 251116491Sharti#define F_USERS 5 /* list of users */ 252116491Sharti#define F_WALL 6 /* everyone logged on */ 253116491Sharti#define F_PIPE 7 /* pipe to program */ 254118170Sharti 255118170Sharticonst char *TypeNames[8] = { 256116491Sharti "UNUSED", "FILE", "TTY", "CONSOLE", 257116491Sharti "FORW", "USERS", "WALL", "PIPE" 258116491Sharti}; 259116491Sharti 260116491Shartistatic struct filed *Files; /* Log files that we write to */ 261116491Shartistatic struct filed consfile; /* Console */ 262116491Sharti 263116491Shartistatic int Debug; /* debug flag */ 264116491Shartistatic int resolve = 1; /* resolve hostname */ 265116491Shartistatic char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 266116491Shartistatic char *LocalDomain; /* our local domain name */ 267116491Shartistatic int *finet; /* Internet datagram socket */ 268116491Shartistatic int fklog = -1; /* /dev/klog */ 269116491Shartistatic int Initialized; /* set when we have initialized ourselves */ 270116491Shartistatic int MarkInterval = 20 * 60; /* interval between marks in seconds */ 271116491Shartistatic int MarkSeq; /* mark sequence number */ 272116491Shartistatic int SecureMode; /* when true, receive only unix domain socks */ 273116491Sharti#ifdef INET6 274116491Shartistatic int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 275116491Sharti#else 276116491Shartistatic int family = PF_INET; /* protocol family (IPv4 only) */ 277116491Sharti#endif 278116491Shartistatic int send_to_all; /* send message to all IPv4/IPv6 addresses */ 279116491Shartistatic int use_bootfile; /* log entire bootfile for every kern msg */ 280116491Shartistatic int no_compress; /* don't compress messages (1=pipes, 2=all) */ 281116491Sharti 282116491Shartistatic char bootfile[MAXLINE+1]; /* booted kernel file */ 283116491Sharti 284116491Shartistruct allowedpeer *AllowedPeers; /* List of allowed peers */ 285116491Shartistatic int NumAllowed; /* Number of entries in AllowedPeers */ 286116491Sharti 287116491Shartistatic int UniquePriority; /* Only log specified priority? */ 288116491Shartistatic int LogFacPri; /* Put facility and priority in log message: */ 289116491Sharti /* 0=no, 1=numeric, 2=names */ 290116491Shartistatic int KeepKernFac; /* Keep remotely logged kernel facility */ 291116491Sharti 292116491Shartivolatile sig_atomic_t MarkSet, WantDie; 293116491Sharti 294116491Shartistatic int allowaddr(char *); 295116491Shartistatic void cfline(const char *, struct filed *, 296116491Sharti const char *, const char *); 297116491Shartistatic const char *cvthname(struct sockaddr *); 298116491Shartistatic void deadq_enter(pid_t, const char *); 299116491Shartistatic int deadq_remove(pid_t); 300116491Shartistatic int decode(const char *, CODE *); 301116491Shartistatic void die(int); 302116491Shartistatic void dodie(int); 303116491Shartistatic void domark(int); 304116491Shartistatic void fprintlog(struct filed *, int, const char *); 305116491Shartistatic int *socksetup(int, const char *); 306116491Shartistatic void init(int); 307116491Shartistatic void logerror(const char *); 308116491Shartistatic void logmsg(int, const char *, const char *, int); 309116491Shartistatic void log_deadchild(pid_t, int, const char *); 310116491Shartistatic void markit(void); 311116491Shartistatic int skip_message(const char *, const char *, int); 312116491Shartistatic void printline(const char *, char *); 313116491Shartistatic void printsys(char *); 314116491Shartistatic int p_open(const char *, pid_t *); 315116491Shartistatic void readklog(void); 316116491Shartistatic void reapchild(int); 317116491Shartistatic void usage(void); 318116491Shartistatic int validate(struct sockaddr *, const char *); 319116491Shartistatic void unmapped(struct sockaddr *); 320116491Shartistatic void wallmsg(struct filed *, struct iovec *); 321116491Shartistatic int waitdaemon(int, int, int); 322116491Shartistatic void timedout(int); 323116491Sharti 324116491Shartiint 325116491Shartimain(int argc, char *argv[]) 326116491Sharti{ 327116491Sharti int ch, i, fdsrmax = 0, l; 328116491Sharti struct sockaddr_un sunx, fromunix; 329116491Sharti struct sockaddr_storage frominet; 330116491Sharti fd_set *fdsr = NULL; 331116491Sharti FILE *fp; 332116491Sharti char line[MAXLINE + 1]; 333116491Sharti const char *bindhostname, *hname; 334116491Sharti struct timeval tv, *tvp; 335116491Sharti struct sigaction sact; 336116491Sharti sigset_t mask; 337116491Sharti pid_t ppid = 1; 338116491Sharti socklen_t len; 339116491Sharti 340116491Sharti bindhostname = NULL; 341116491Sharti while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:nop:P:suv")) != -1) 342116491Sharti switch (ch) { 343116491Sharti case '4': 344116491Sharti family = PF_INET; 345116491Sharti break; 346116491Sharti#ifdef INET6 347116491Sharti case '6': 348116491Sharti family = PF_INET6; 349116491Sharti break; 350116491Sharti#endif 351116491Sharti case 'A': 352116491Sharti send_to_all++; 353116491Sharti break; 354116491Sharti case 'a': /* allow specific network addresses only */ 355116491Sharti if (allowaddr(optarg) == -1) 356116491Sharti usage(); 357116491Sharti break; 358116491Sharti case 'b': 359116491Sharti bindhostname = optarg; 360116491Sharti break; 361116491Sharti case 'c': 362116491Sharti no_compress++; 363116491Sharti break; 364116491Sharti case 'd': /* debug */ 365116491Sharti Debug++; 366116491Sharti break; 367116491Sharti case 'f': /* configuration file */ 368116491Sharti ConfFile = optarg; 369116491Sharti break; 370116491Sharti case 'k': /* keep remote kern fac */ 371116491Sharti KeepKernFac = 1; 372116491Sharti break; 373116491Sharti case 'l': 374116491Sharti if (nfunix < MAXFUNIX) 375116491Sharti funixn[nfunix++] = optarg; 376116491Sharti else 377116491Sharti warnx("out of descriptors, ignoring %s", 378116491Sharti optarg); 379116491Sharti break; 380116491Sharti case 'm': /* mark interval */ 381116491Sharti MarkInterval = atoi(optarg) * 60; 382121687Sharti break; 383116491Sharti case 'n': 384116491Sharti resolve = 0; 385116491Sharti break; 386121687Sharti case 'o': 387121687Sharti use_bootfile = 1; 388121687Sharti break; 389121687Sharti case 'p': /* path */ 390121687Sharti funixn[0] = optarg; 391116491Sharti break; 392116491Sharti case 'P': /* path for alt. PID */ 393116491Sharti PidFile = optarg; 394116491Sharti break; 395116491Sharti case 's': /* no network mode */ 396116491Sharti SecureMode++; 397121687Sharti break; 398121687Sharti case 'u': /* only log specified priority */ 399121687Sharti UniquePriority++; 400121687Sharti break; 401121687Sharti case 'v': /* log facility and priority */ 402116491Sharti LogFacPri++; 403116491Sharti break; 404116491Sharti case '?': 405116491Sharti default: 406118540Sharti usage(); 407116491Sharti } 408116491Sharti if ((argc -= optind) != 0) 409116491Sharti usage(); 410116491Sharti 411116491Sharti if (!Debug) { 412116491Sharti ppid = waitdaemon(0, 0, 30); 413116491Sharti if (ppid < 0) 414116491Sharti err(1, "could not become daemon"); 415116491Sharti } else { 416116491Sharti setlinebuf(stdout); 417116491Sharti } 418116491Sharti 419116491Sharti if (NumAllowed) 420116491Sharti endservent(); 421116491Sharti 422116491Sharti consfile.f_type = F_CONSOLE; 423116491Sharti (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 424116491Sharti sizeof(consfile.f_un.f_fname)); 425116491Sharti (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 426117382Sharti (void)signal(SIGTERM, dodie); 427116491Sharti (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 428116491Sharti (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 429116491Sharti /* 430116491Sharti * We don't want the SIGCHLD and SIGHUP handlers to interfere 431116491Sharti * with each other; they are likely candidates for being called 432116491Sharti * simultaneously (SIGHUP closes pipe descriptor, process dies, 433116491Sharti * SIGCHLD happens). 434116491Sharti */ 435116491Sharti sigemptyset(&mask); 436116491Sharti sigaddset(&mask, SIGHUP); 437116491Sharti sact.sa_handler = reapchild; 438117382Sharti sact.sa_mask = mask; 439116491Sharti sact.sa_flags = SA_RESTART; 440116491Sharti (void)sigaction(SIGCHLD, &sact, NULL); 441116491Sharti (void)signal(SIGALRM, domark); 442116491Sharti (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 443116491Sharti (void)alarm(TIMERINTVL); 444116491Sharti 445116491Sharti TAILQ_INIT(&deadq_head); 446116491Sharti 447116491Sharti#ifndef SUN_LEN 448116491Sharti#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 449116491Sharti#endif 450116491Sharti for (i = 0; i < nfunix; i++) { 451116491Sharti (void)unlink(funixn[i]); 452116491Sharti memset(&sunx, 0, sizeof(sunx)); 453116491Sharti sunx.sun_family = AF_UNIX; 454116491Sharti (void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 455116491Sharti funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 456116491Sharti if (funix[i] < 0 || 457116491Sharti bind(funix[i], (struct sockaddr *)&sunx, 458116491Sharti SUN_LEN(&sunx)) < 0 || 459116491Sharti chmod(funixn[i], 0666) < 0) { 460116491Sharti (void)snprintf(line, sizeof line, 461116491Sharti "cannot create %s", funixn[i]); 462116491Sharti logerror(line); 463116491Sharti dprintf("cannot create %s (%d)\n", funixn[i], errno); 464116491Sharti if (i == 0) 465116491Sharti die(0); 466116491Sharti } 467116491Sharti } 468116491Sharti if (SecureMode <= 1) 469116491Sharti finet = socksetup(family, bindhostname); 470116491Sharti 471118540Sharti if (finet) { 472116491Sharti if (SecureMode) { 473116491Sharti for (i = 0; i < *finet; i++) { 474116491Sharti if (shutdown(finet[i+1], SHUT_RD) < 0) { 475116491Sharti logerror("shutdown"); 476116491Sharti if (!Debug) 477116491Sharti die(0); 478116491Sharti } 479116491Sharti } 480116491Sharti } else { 481116491Sharti dprintf("listening on inet and/or inet6 socket\n"); 482116491Sharti } 483116491Sharti dprintf("sending on inet and/or inet6 socket\n"); 484116491Sharti } 485116491Sharti 486116491Sharti if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 487116491Sharti if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 488116491Sharti fklog = -1; 489116491Sharti if (fklog < 0) 490118170Sharti dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 491118170Sharti 492116491Sharti /* tuck my process id away */ 493116491Sharti fp = fopen(PidFile, "w"); 494116491Sharti if (fp != NULL) { 495116491Sharti fprintf(fp, "%d\n", getpid()); 496116491Sharti (void)fclose(fp); 497116491Sharti } 498116491Sharti 499116491Sharti dprintf("off & running....\n"); 500116491Sharti 501116491Sharti init(0); 502116491Sharti /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 503116491Sharti sigemptyset(&mask); 504116491Sharti sigaddset(&mask, SIGCHLD); 505116491Sharti sact.sa_handler = init; 506116491Sharti sact.sa_mask = mask; 507116491Sharti sact.sa_flags = SA_RESTART; 508116491Sharti (void)sigaction(SIGHUP, &sact, NULL); 509116491Sharti 510116491Sharti tvp = &tv; 511116491Sharti tv.tv_sec = tv.tv_usec = 0; 512116491Sharti 513116491Sharti if (fklog != -1 && fklog > fdsrmax) 514116491Sharti fdsrmax = fklog; 515116491Sharti if (finet && !SecureMode) { 516116491Sharti for (i = 0; i < *finet; i++) { 517116491Sharti if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 518116491Sharti fdsrmax = finet[i+1]; 519116491Sharti } 520116491Sharti } 521116491Sharti for (i = 0; i < nfunix; i++) { 522116491Sharti if (funix[i] != -1 && funix[i] > fdsrmax) 523116491Sharti fdsrmax = funix[i]; 524116491Sharti } 525116491Sharti 526116491Sharti fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 527116491Sharti sizeof(fd_mask)); 528116491Sharti if (fdsr == NULL) 529116491Sharti errx(1, "calloc fd_set"); 530116491Sharti 531116491Sharti for (;;) { 532116491Sharti if (MarkSet) 533116491Sharti markit(); 534116491Sharti if (WantDie) 535116491Sharti die(WantDie); 536116491Sharti 537116491Sharti bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 538116491Sharti sizeof(fd_mask)); 539116491Sharti 540116491Sharti if (fklog != -1) 541116491Sharti FD_SET(fklog, fdsr); 542116491Sharti if (finet && !SecureMode) { 543116491Sharti for (i = 0; i < *finet; i++) { 544116491Sharti if (finet[i+1] != -1) 545116491Sharti FD_SET(finet[i+1], fdsr); 546116491Sharti } 547116491Sharti } 548116491Sharti for (i = 0; i < nfunix; i++) { 549116491Sharti if (funix[i] != -1) 550116491Sharti FD_SET(funix[i], fdsr); 551116491Sharti } 552116491Sharti 553116491Sharti i = select(fdsrmax+1, fdsr, NULL, NULL, tvp); 554116491Sharti switch (i) { 555116491Sharti case 0: 556116491Sharti if (tvp) { 557116491Sharti tvp = NULL; 558116491Sharti if (ppid != 1) 559116491Sharti kill(ppid, SIGALRM); 560116491Sharti } 561116491Sharti continue; 562116491Sharti case -1: 563116491Sharti if (errno != EINTR) 564116491Sharti logerror("select"); 565116491Sharti continue; 566116491Sharti } 567116491Sharti if (fklog != -1 && FD_ISSET(fklog, fdsr)) 568116491Sharti readklog(); 569116491Sharti if (finet && !SecureMode) { 570116491Sharti for (i = 0; i < *finet; i++) { 571116491Sharti if (FD_ISSET(finet[i+1], fdsr)) { 572116491Sharti len = sizeof(frominet); 573116491Sharti l = recvfrom(finet[i+1], line, MAXLINE, 574116491Sharti 0, (struct sockaddr *)&frominet, 575116491Sharti &len); 576116491Sharti if (l > 0) { 577116491Sharti line[l] = '\0'; 578116491Sharti hname = cvthname((struct sockaddr *)&frominet); 579116491Sharti unmapped((struct sockaddr *)&frominet); 580116491Sharti if (validate((struct sockaddr *)&frominet, hname)) 581116491Sharti printline(hname, line); 582116491Sharti } else if (l < 0 && errno != EINTR) 583116491Sharti logerror("recvfrom inet"); 584116491Sharti } 585118598Sharti } 586118598Sharti } 587118598Sharti for (i = 0; i < nfunix; i++) { 588118598Sharti if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) { 589116491Sharti len = sizeof(fromunix); 590116491Sharti l = recvfrom(funix[i], line, MAXLINE, 0, 591116491Sharti (struct sockaddr *)&fromunix, &len); 592116491Sharti if (l > 0) { 593116491Sharti line[l] = '\0'; 594116491Sharti printline(LocalHostName, line); 595116491Sharti } else if (l < 0 && errno != EINTR) 596116491Sharti logerror("recvfrom unix"); 597116491Sharti } 598116491Sharti } 599116491Sharti } 600116491Sharti if (fdsr) 601116491Sharti free(fdsr); 602116491Sharti} 603116491Sharti 604116491Shartistatic void 605116491Shartiunmapped(struct sockaddr *sa) 606116491Sharti{ 607116491Sharti struct sockaddr_in6 *sin6; 608116491Sharti struct sockaddr_in sin4; 609116491Sharti 610116491Sharti if (sa->sa_family != AF_INET6) 611116491Sharti return; 612116491Sharti if (sa->sa_len != sizeof(struct sockaddr_in6) || 613116491Sharti sizeof(sin4) > sa->sa_len) 614116491Sharti return; 615116491Sharti sin6 = (struct sockaddr_in6 *)sa; 616116491Sharti if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 617116491Sharti return; 618116491Sharti 619116491Sharti memset(&sin4, 0, sizeof(sin4)); 620116491Sharti sin4.sin_family = AF_INET; 621116491Sharti sin4.sin_len = sizeof(struct sockaddr_in); 622116491Sharti memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 623116491Sharti sizeof(sin4.sin_addr)); 624116491Sharti sin4.sin_port = sin6->sin6_port; 625116491Sharti 626116491Sharti memcpy(sa, &sin4, sin4.sin_len); 627116491Sharti} 628116491Sharti 629116491Shartistatic void 630116491Shartiusage(void) 631116491Sharti{ 632116491Sharti 633116491Sharti fprintf(stderr, "%s\n%s\n%s\n%s\n", 634116491Sharti "usage: syslogd [-46Acdknosuv] [-a allowed_peer]", 635116491Sharti " [-b bind address] [-f config_file]", 636116491Sharti " [-l log_socket] [-m mark_interval]", 637116491Sharti " [-P pid_file] [-p log_socket]"); 638116491Sharti exit(1); 639116491Sharti} 640116491Sharti 641116491Sharti/* 642116491Sharti * Take a raw input line, decode the message, and print the message 643116491Sharti * on the appropriate log files. 644116491Sharti */ 645116491Shartistatic void 646116491Shartiprintline(const char *hname, char *msg) 647116491Sharti{ 648116491Sharti int c, pri; 649116491Sharti char *p, *q, line[MAXLINE + 1]; 650116491Sharti 651116491Sharti /* test for special codes */ 652116491Sharti pri = DEFUPRI; 653116491Sharti p = msg; 654116491Sharti if (*p == '<') { 655116491Sharti pri = 0; 656116491Sharti while (isdigit(*++p)) 657116491Sharti pri = 10 * pri + (*p - '0'); 658116491Sharti if (*p == '>') 659118598Sharti ++p; 660118598Sharti } 661118598Sharti if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 662118598Sharti pri = DEFUPRI; 663116491Sharti 664116491Sharti /* don't allow users to log kernel messages */ 665116491Sharti if (LOG_FAC(pri) == LOG_KERN && !KeepKernFac) 666116491Sharti pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 667116491Sharti 668116491Sharti q = line; 669116491Sharti 670116491Sharti while ((c = (unsigned char)*p++) != '\0' && 671116491Sharti q < &line[sizeof(line) - 4]) { 672116491Sharti if ((c & 0x80) && c < 0xA0) { 673116491Sharti c &= 0x7F; 674116491Sharti *q++ = 'M'; 675116491Sharti *q++ = '-'; 676116491Sharti } 677116491Sharti if (isascii(c) && iscntrl(c)) { 678116491Sharti if (c == '\n') { 679116491Sharti *q++ = ' '; 680116491Sharti } else if (c == '\t') { 681116491Sharti *q++ = '\t'; 682116491Sharti } else { 683116491Sharti *q++ = '^'; 684116491Sharti *q++ = c ^ 0100; 685116491Sharti } 686116491Sharti } else { 687116491Sharti *q++ = c; 688116491Sharti } 689116491Sharti } 690116491Sharti *q = '\0'; 691116491Sharti 692116491Sharti logmsg(pri, line, hname, 0); 693116491Sharti} 694116491Sharti 695116491Sharti/* 696116491Sharti * Read /dev/klog while data are available, split into lines. 697116491Sharti */ 698116491Shartistatic void 699116491Shartireadklog(void) 700116491Sharti{ 701116491Sharti char *p, *q, line[MAXLINE + 1]; 702116491Sharti int len, i; 703116491Sharti 704116491Sharti len = 0; 705116491Sharti for (;;) { 706116491Sharti i = read(fklog, line + len, MAXLINE - 1 - len); 707116491Sharti if (i > 0) { 708116491Sharti line[i + len] = '\0'; 709116491Sharti } else { 710116491Sharti if (i < 0 && errno != EINTR && errno != EAGAIN) { 711116491Sharti logerror("klog"); 712116491Sharti fklog = -1; 713116491Sharti } 714116491Sharti break; 715116491Sharti } 716116491Sharti 717116491Sharti for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 718116491Sharti *q = '\0'; 719116491Sharti printsys(p); 720116491Sharti } 721116491Sharti len = strlen(p); 722116491Sharti if (len >= MAXLINE - 1) { 723116491Sharti printsys(p); 724116491Sharti len = 0; 725116491Sharti } 726116491Sharti if (len > 0) 727116491Sharti memmove(line, p, len + 1); 728116491Sharti } 729116491Sharti if (len > 0) 730116491Sharti printsys(line); 731116491Sharti} 732116491Sharti 733116491Sharti/* 734116491Sharti * Take a raw input line from /dev/klog, format similar to syslog(). 735116491Sharti */ 736116491Shartistatic void 737116491Shartiprintsys(char *p) 738116491Sharti{ 739116491Sharti int pri, flags; 740116491Sharti 741116491Sharti flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 742116491Sharti pri = DEFSPRI; 743116491Sharti if (*p == '<') { 744116491Sharti pri = 0; 745116491Sharti while (isdigit(*++p)) 746116491Sharti pri = 10 * pri + (*p - '0'); 747116491Sharti if (*p == '>') 748116491Sharti ++p; 749116491Sharti if ((pri & LOG_FACMASK) == LOG_CONSOLE) 750116491Sharti flags |= IGN_CONS; 751116491Sharti } else { 752116491Sharti /* kernel printf's come out on console */ 753116491Sharti flags |= IGN_CONS; 754116491Sharti } 755116491Sharti if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 756116491Sharti pri = DEFSPRI; 757116491Sharti logmsg(pri, p, LocalHostName, flags); 758116491Sharti} 759116491Sharti 760116491Shartistatic time_t now; 761116491Sharti 762116491Sharti/* 763116491Sharti * Match a program or host name against a specification. 764116491Sharti * Return a non-0 value if the message must be ignored 765116491Sharti * based on the specification. 766116491Sharti */ 767116491Shartistatic int 768116491Shartiskip_message(const char *name, const char *spec, int checkcase) { 769116491Sharti const char *s; 770116491Sharti char prev, next; 771116491Sharti int exclude = 0; 772116491Sharti /* Behaviour on explicit match */ 773116491Sharti 774116491Sharti if (spec == NULL) 775116491Sharti return 0; 776116491Sharti switch (*spec) { 777116491Sharti case '-': 778116491Sharti exclude = 1; 779116491Sharti /*FALLTHROUGH*/ 780116491Sharti case '+': 781116491Sharti spec++; 782116491Sharti break; 783116491Sharti default: 784116491Sharti break; 785116491Sharti } 786 if (checkcase) 787 s = strstr (spec, name); 788 else 789 s = strcasestr (spec, name); 790 791 if (s != NULL) { 792 prev = (s == spec ? ',' : *(s - 1)); 793 next = *(s + strlen (name)); 794 795 if (prev == ',' && (next == '\0' || next == ',')) 796 /* Explicit match: skip iff the spec is an 797 exclusive one. */ 798 return exclude; 799 } 800 801 /* No explicit match for this name: skip the message iff 802 the spec is an inclusive one. */ 803 return !exclude; 804} 805 806/* 807 * Log a message to the appropriate log files, users, etc. based on 808 * the priority. 809 */ 810static void 811logmsg(int pri, const char *msg, const char *from, int flags) 812{ 813 struct filed *f; 814 int i, fac, msglen, omask, prilev; 815 const char *timestamp; 816 char prog[NAME_MAX+1]; 817 char buf[MAXLINE+1]; 818 819 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 820 pri, flags, from, msg); 821 822 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 823 824 /* 825 * Check to see if msg looks non-standard. 826 */ 827 msglen = strlen(msg); 828 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 829 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 830 flags |= ADDDATE; 831 832 (void)time(&now); 833 if (flags & ADDDATE) { 834 timestamp = ctime(&now) + 4; 835 } else { 836 timestamp = msg; 837 msg += 16; 838 msglen -= 16; 839 } 840 841 /* skip leading blanks */ 842 while (isspace(*msg)) { 843 msg++; 844 msglen--; 845 } 846 847 /* extract facility and priority level */ 848 if (flags & MARK) 849 fac = LOG_NFACILITIES; 850 else 851 fac = LOG_FAC(pri); 852 prilev = LOG_PRI(pri); 853 854 /* extract program name */ 855 for (i = 0; i < NAME_MAX; i++) { 856 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[') 857 break; 858 prog[i] = msg[i]; 859 } 860 prog[i] = 0; 861 862 /* add kernel prefix for kernel messages */ 863 if (flags & ISKERNEL) { 864 snprintf(buf, sizeof(buf), "%s: %s", 865 use_bootfile ? bootfile : "kernel", msg); 866 msg = buf; 867 msglen = strlen(buf); 868 } 869 870 /* log the message to the particular outputs */ 871 if (!Initialized) { 872 f = &consfile; 873 f->f_file = open(ctty, O_WRONLY, 0); 874 875 if (f->f_file >= 0) { 876 (void)strlcpy(f->f_lasttime, timestamp, 877 sizeof(f->f_lasttime)); 878 fprintlog(f, flags, msg); 879 (void)close(f->f_file); 880 } 881 (void)sigsetmask(omask); 882 return; 883 } 884 for (f = Files; f; f = f->f_next) { 885 /* skip messages that are incorrect priority */ 886 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 887 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 888 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 889 ) 890 || f->f_pmask[fac] == INTERNAL_NOPRI) 891 continue; 892 893 /* skip messages with the incorrect hostname */ 894 if (skip_message(from, f->f_host, 0)) 895 continue; 896 897 /* skip messages with the incorrect program name */ 898 if (skip_message(prog, f->f_program, 1)) 899 continue; 900 901 /* skip message to console if it has already been printed */ 902 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 903 continue; 904 905 /* don't output marks to recently written files */ 906 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 907 continue; 908 909 /* 910 * suppress duplicate lines to this file 911 */ 912 if (no_compress - (f->f_type != F_PIPE) < 1 && 913 (flags & MARK) == 0 && msglen == f->f_prevlen && 914 !strcmp(msg, f->f_prevline) && 915 !strcasecmp(from, f->f_prevhost)) { 916 (void)strlcpy(f->f_lasttime, timestamp, 917 sizeof(f->f_lasttime)); 918 f->f_prevcount++; 919 dprintf("msg repeated %d times, %ld sec of %d\n", 920 f->f_prevcount, (long)(now - f->f_time), 921 repeatinterval[f->f_repeatcount]); 922 /* 923 * If domark would have logged this by now, 924 * flush it now (so we don't hold isolated messages), 925 * but back off so we'll flush less often 926 * in the future. 927 */ 928 if (now > REPEATTIME(f)) { 929 fprintlog(f, flags, (char *)NULL); 930 BACKOFF(f); 931 } 932 } else { 933 /* new line, save it */ 934 if (f->f_prevcount) 935 fprintlog(f, 0, (char *)NULL); 936 f->f_repeatcount = 0; 937 f->f_prevpri = pri; 938 (void)strlcpy(f->f_lasttime, timestamp, 939 sizeof(f->f_lasttime)); 940 (void)strlcpy(f->f_prevhost, from, 941 sizeof(f->f_prevhost)); 942 if (msglen < MAXSVLINE) { 943 f->f_prevlen = msglen; 944 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 945 fprintlog(f, flags, (char *)NULL); 946 } else { 947 f->f_prevline[0] = 0; 948 f->f_prevlen = 0; 949 fprintlog(f, flags, msg); 950 } 951 } 952 } 953 (void)sigsetmask(omask); 954} 955 956static void 957fprintlog(struct filed *f, int flags, const char *msg) 958{ 959 struct iovec iov[7]; 960 struct iovec *v; 961 struct addrinfo *r; 962 int i, l, lsent = 0; 963 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 964 const char *msgret; 965 966 v = iov; 967 if (f->f_type == F_WALL) { 968 v->iov_base = greetings; 969 v->iov_len = snprintf(greetings, sizeof greetings, 970 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 971 f->f_prevhost, ctime(&now)); 972 if (v->iov_len > 0) 973 v++; 974 v->iov_base = ""; 975 v->iov_len = 0; 976 v++; 977 } else { 978 v->iov_base = f->f_lasttime; 979 v->iov_len = 15; 980 v++; 981 v->iov_base = " "; 982 v->iov_len = 1; 983 v++; 984 } 985 986 if (LogFacPri) { 987 static char fp_buf[30]; /* Hollow laugh */ 988 int fac = f->f_prevpri & LOG_FACMASK; 989 int pri = LOG_PRI(f->f_prevpri); 990 const char *f_s = NULL; 991 char f_n[5]; /* Hollow laugh */ 992 const char *p_s = NULL; 993 char p_n[5]; /* Hollow laugh */ 994 995 if (LogFacPri > 1) { 996 CODE *c; 997 998 for (c = facilitynames; c->c_name; c++) { 999 if (c->c_val == fac) { 1000 f_s = c->c_name; 1001 break; 1002 } 1003 } 1004 for (c = prioritynames; c->c_name; c++) { 1005 if (c->c_val == pri) { 1006 p_s = c->c_name; 1007 break; 1008 } 1009 } 1010 } 1011 if (!f_s) { 1012 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1013 f_s = f_n; 1014 } 1015 if (!p_s) { 1016 snprintf(p_n, sizeof p_n, "%d", pri); 1017 p_s = p_n; 1018 } 1019 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1020 v->iov_base = fp_buf; 1021 v->iov_len = strlen(fp_buf); 1022 } else { 1023 v->iov_base=""; 1024 v->iov_len = 0; 1025 } 1026 v++; 1027 1028 v->iov_base = f->f_prevhost; 1029 v->iov_len = strlen(v->iov_base); 1030 v++; 1031 v->iov_base = " "; 1032 v->iov_len = 1; 1033 v++; 1034 1035 if (msg) { 1036 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1037 if (wmsg == NULL) { 1038 logerror("strdup"); 1039 exit(1); 1040 } 1041 v->iov_base = wmsg; 1042 v->iov_len = strlen(msg); 1043 } else if (f->f_prevcount > 1) { 1044 v->iov_base = repbuf; 1045 v->iov_len = snprintf(repbuf, sizeof repbuf, 1046 "last message repeated %d times", f->f_prevcount); 1047 } else { 1048 v->iov_base = f->f_prevline; 1049 v->iov_len = f->f_prevlen; 1050 } 1051 v++; 1052 1053 dprintf("Logging to %s", TypeNames[f->f_type]); 1054 f->f_time = now; 1055 1056 switch (f->f_type) { 1057 case F_UNUSED: 1058 dprintf("\n"); 1059 break; 1060 1061 case F_FORW: 1062 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1063 /* check for local vs remote messages */ 1064 if (strcasecmp(f->f_prevhost, LocalHostName)) 1065 l = snprintf(line, sizeof line - 1, 1066 "<%d>%.15s Forwarded from %s: %s", 1067 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 1068 iov[5].iov_base); 1069 else 1070 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1071 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 1072 if (l < 0) 1073 l = 0; 1074 else if (l > MAXLINE) 1075 l = MAXLINE; 1076 1077 if (finet) { 1078 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1079 for (i = 0; i < *finet; i++) { 1080#if 0 1081 /* 1082 * should we check AF first, or just 1083 * trial and error? FWD 1084 */ 1085 if (r->ai_family == 1086 address_family_of(finet[i+1])) 1087#endif 1088 lsent = sendto(finet[i+1], line, l, 0, 1089 r->ai_addr, r->ai_addrlen); 1090 if (lsent == l) 1091 break; 1092 } 1093 if (lsent == l && !send_to_all) 1094 break; 1095 } 1096 dprintf("lsent/l: %d/%d\n", lsent, l); 1097 if (lsent != l) { 1098 int e = errno; 1099 logerror("sendto"); 1100 errno = e; 1101 switch (errno) { 1102 case EHOSTUNREACH: 1103 case EHOSTDOWN: 1104 break; 1105 /* case EBADF: */ 1106 /* case EACCES: */ 1107 /* case ENOTSOCK: */ 1108 /* case EFAULT: */ 1109 /* case EMSGSIZE: */ 1110 /* case EAGAIN: */ 1111 /* case ENOBUFS: */ 1112 /* case ECONNREFUSED: */ 1113 default: 1114 dprintf("removing entry\n"); 1115 (void)close(f->f_file); 1116 f->f_type = F_UNUSED; 1117 break; 1118 } 1119 } 1120 } 1121 break; 1122 1123 case F_FILE: 1124 dprintf(" %s\n", f->f_un.f_fname); 1125 v->iov_base = "\n"; 1126 v->iov_len = 1; 1127 if (writev(f->f_file, iov, 7) < 0) { 1128 int e = errno; 1129 (void)close(f->f_file); 1130 f->f_type = F_UNUSED; 1131 errno = e; 1132 logerror(f->f_un.f_fname); 1133 } else if (flags & SYNC_FILE) 1134 (void)fsync(f->f_file); 1135 break; 1136 1137 case F_PIPE: 1138 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1139 v->iov_base = "\n"; 1140 v->iov_len = 1; 1141 if (f->f_un.f_pipe.f_pid == 0) { 1142 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1143 &f->f_un.f_pipe.f_pid)) < 0) { 1144 f->f_type = F_UNUSED; 1145 logerror(f->f_un.f_pipe.f_pname); 1146 break; 1147 } 1148 } 1149 if (writev(f->f_file, iov, 7) < 0) { 1150 int e = errno; 1151 (void)close(f->f_file); 1152 if (f->f_un.f_pipe.f_pid > 0) 1153 deadq_enter(f->f_un.f_pipe.f_pid, 1154 f->f_un.f_pipe.f_pname); 1155 f->f_un.f_pipe.f_pid = 0; 1156 errno = e; 1157 logerror(f->f_un.f_pipe.f_pname); 1158 } 1159 break; 1160 1161 case F_CONSOLE: 1162 if (flags & IGN_CONS) { 1163 dprintf(" (ignored)\n"); 1164 break; 1165 } 1166 /* FALLTHROUGH */ 1167 1168 case F_TTY: 1169 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1170 v->iov_base = "\r\n"; 1171 v->iov_len = 2; 1172 1173 errno = 0; /* ttymsg() only sometimes returns an errno */ 1174 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1175 f->f_type = F_UNUSED; 1176 logerror(msgret); 1177 } 1178 break; 1179 1180 case F_USERS: 1181 case F_WALL: 1182 dprintf("\n"); 1183 v->iov_base = "\r\n"; 1184 v->iov_len = 2; 1185 wallmsg(f, iov); 1186 break; 1187 } 1188 f->f_prevcount = 0; 1189 if (msg) 1190 free(wmsg); 1191} 1192 1193/* 1194 * WALLMSG -- Write a message to the world at large 1195 * 1196 * Write the specified message to either the entire 1197 * world, or a list of approved users. 1198 */ 1199static void 1200wallmsg(struct filed *f, struct iovec *iov) 1201{ 1202 static int reenter; /* avoid calling ourselves */ 1203 FILE *uf; 1204 struct utmp ut; 1205 int i; 1206 const char *p; 1207 char line[sizeof(ut.ut_line) + 1]; 1208 1209 if (reenter++) 1210 return; 1211 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1212 logerror(_PATH_UTMP); 1213 reenter = 0; 1214 return; 1215 } 1216 /* NOSTRICT */ 1217 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1218 if (ut.ut_name[0] == '\0') 1219 continue; 1220 (void)strlcpy(line, ut.ut_line, sizeof(line)); 1221 if (f->f_type == F_WALL) { 1222 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1223 errno = 0; /* already in msg */ 1224 logerror(p); 1225 } 1226 continue; 1227 } 1228 /* should we send the message to this user? */ 1229 for (i = 0; i < MAXUNAMES; i++) { 1230 if (!f->f_un.f_uname[i][0]) 1231 break; 1232 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1233 UT_NAMESIZE)) { 1234 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1235 != NULL) { 1236 errno = 0; /* already in msg */ 1237 logerror(p); 1238 } 1239 break; 1240 } 1241 } 1242 } 1243 (void)fclose(uf); 1244 reenter = 0; 1245} 1246 1247static void 1248reapchild(int signo __unused) 1249{ 1250 int status; 1251 pid_t pid; 1252 struct filed *f; 1253 1254 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1255 if (!Initialized) 1256 /* Don't tell while we are initting. */ 1257 continue; 1258 1259 /* First, look if it's a process from the dead queue. */ 1260 if (deadq_remove(pid)) 1261 goto oncemore; 1262 1263 /* Now, look in list of active processes. */ 1264 for (f = Files; f; f = f->f_next) 1265 if (f->f_type == F_PIPE && 1266 f->f_un.f_pipe.f_pid == pid) { 1267 (void)close(f->f_file); 1268 f->f_un.f_pipe.f_pid = 0; 1269 log_deadchild(pid, status, 1270 f->f_un.f_pipe.f_pname); 1271 break; 1272 } 1273 oncemore: 1274 continue; 1275 } 1276} 1277 1278/* 1279 * Return a printable representation of a host address. 1280 */ 1281static const char * 1282cvthname(struct sockaddr *f) 1283{ 1284 int error, hl; 1285 sigset_t omask, nmask; 1286 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1287 1288 error = getnameinfo((struct sockaddr *)f, 1289 ((struct sockaddr *)f)->sa_len, 1290 ip, sizeof ip, NULL, 0, 1291 NI_NUMERICHOST | withscopeid); 1292 dprintf("cvthname(%s)\n", ip); 1293 1294 if (error) { 1295 dprintf("Malformed from address %s\n", gai_strerror(error)); 1296 return ("???"); 1297 } 1298 if (!resolve) 1299 return (ip); 1300 1301 sigemptyset(&nmask); 1302 sigaddset(&nmask, SIGHUP); 1303 sigprocmask(SIG_BLOCK, &nmask, &omask); 1304 error = getnameinfo((struct sockaddr *)f, 1305 ((struct sockaddr *)f)->sa_len, 1306 hname, sizeof hname, NULL, 0, 1307 NI_NAMEREQD | withscopeid); 1308 sigprocmask(SIG_SETMASK, &omask, NULL); 1309 if (error) { 1310 dprintf("Host name for your address (%s) unknown\n", ip); 1311 return (ip); 1312 } 1313 hl = strlen(hname); 1314 if (hl > 0 && hname[hl-1] == '.') 1315 hname[--hl] = '\0'; 1316 trimdomain(hname, hl); 1317 return (hname); 1318} 1319 1320static void 1321dodie(int signo) 1322{ 1323 1324 WantDie = signo; 1325} 1326 1327static void 1328domark(int signo __unused) 1329{ 1330 1331 MarkSet = 1; 1332} 1333 1334/* 1335 * Print syslogd errors some place. 1336 */ 1337static void 1338logerror(const char *type) 1339{ 1340 char buf[512]; 1341 static int recursed = 0; 1342 1343 /* If there's an error while trying to log an error, give up. */ 1344 if (recursed) 1345 return; 1346 recursed++; 1347 if (errno) 1348 (void)snprintf(buf, 1349 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1350 else 1351 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1352 errno = 0; 1353 dprintf("%s\n", buf); 1354 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1355 recursed--; 1356} 1357 1358static void 1359die(int signo) 1360{ 1361 struct filed *f; 1362 int was_initialized; 1363 char buf[100]; 1364 int i; 1365 1366 was_initialized = Initialized; 1367 Initialized = 0; /* Don't log SIGCHLDs. */ 1368 for (f = Files; f != NULL; f = f->f_next) { 1369 /* flush any pending output */ 1370 if (f->f_prevcount) 1371 fprintlog(f, 0, (char *)NULL); 1372 if (f->f_type == F_PIPE) 1373 (void)close(f->f_file); 1374 } 1375 Initialized = was_initialized; 1376 if (signo) { 1377 dprintf("syslogd: exiting on signal %d\n", signo); 1378 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1379 errno = 0; 1380 logerror(buf); 1381 } 1382 for (i = 0; i < nfunix; i++) 1383 if (funixn[i] && funix[i] != -1) 1384 (void)unlink(funixn[i]); 1385 exit(1); 1386} 1387 1388/* 1389 * INIT -- Initialize syslogd from configuration table 1390 */ 1391static void 1392init(int signo) 1393{ 1394 int i; 1395 FILE *cf; 1396 struct filed *f, *next, **nextp; 1397 char *p; 1398 char cline[LINE_MAX]; 1399 char prog[NAME_MAX+1]; 1400 char host[MAXHOSTNAMELEN]; 1401 char oldLocalHostName[MAXHOSTNAMELEN]; 1402 char hostMsg[2*MAXHOSTNAMELEN+40]; 1403 char bootfileMsg[LINE_MAX]; 1404 1405 dprintf("init\n"); 1406 1407 /* 1408 * Load hostname (may have changed). 1409 */ 1410 if (signo != 0) 1411 (void)strlcpy(oldLocalHostName, LocalHostName, 1412 sizeof(oldLocalHostName)); 1413 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1414 err(EX_OSERR, "gethostname() failed"); 1415 if ((p = strchr(LocalHostName, '.')) != NULL) { 1416 *p++ = '\0'; 1417 LocalDomain = p; 1418 } else { 1419 LocalDomain = ""; 1420 } 1421 1422 /* 1423 * Close all open log files. 1424 */ 1425 Initialized = 0; 1426 for (f = Files; f != NULL; f = next) { 1427 /* flush any pending output */ 1428 if (f->f_prevcount) 1429 fprintlog(f, 0, (char *)NULL); 1430 1431 switch (f->f_type) { 1432 case F_FILE: 1433 case F_FORW: 1434 case F_CONSOLE: 1435 case F_TTY: 1436 (void)close(f->f_file); 1437 break; 1438 case F_PIPE: 1439 (void)close(f->f_file); 1440 if (f->f_un.f_pipe.f_pid > 0) 1441 deadq_enter(f->f_un.f_pipe.f_pid, 1442 f->f_un.f_pipe.f_pname); 1443 f->f_un.f_pipe.f_pid = 0; 1444 break; 1445 } 1446 next = f->f_next; 1447 if (f->f_program) free(f->f_program); 1448 if (f->f_host) free(f->f_host); 1449 free((char *)f); 1450 } 1451 Files = NULL; 1452 nextp = &Files; 1453 1454 /* open the configuration file */ 1455 if ((cf = fopen(ConfFile, "r")) == NULL) { 1456 dprintf("cannot open %s\n", ConfFile); 1457 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1458 if (*nextp == NULL) { 1459 logerror("calloc"); 1460 exit(1); 1461 } 1462 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1463 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1464 if ((*nextp)->f_next == NULL) { 1465 logerror("calloc"); 1466 exit(1); 1467 } 1468 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1469 Initialized = 1; 1470 return; 1471 } 1472 1473 /* 1474 * Foreach line in the conf table, open that file. 1475 */ 1476 f = NULL; 1477 (void)strlcpy(host, "*", sizeof(host)); 1478 (void)strlcpy(prog, "*", sizeof(prog)); 1479 while (fgets(cline, sizeof(cline), cf) != NULL) { 1480 /* 1481 * check for end-of-section, comments, strip off trailing 1482 * spaces and newline character. #!prog is treated specially: 1483 * following lines apply only to that program. 1484 */ 1485 for (p = cline; isspace(*p); ++p) 1486 continue; 1487 if (*p == 0) 1488 continue; 1489 if (*p == '#') { 1490 p++; 1491 if (*p != '!' && *p != '+' && *p != '-') 1492 continue; 1493 } 1494 if (*p == '+' || *p == '-') { 1495 host[0] = *p++; 1496 while (isspace(*p)) 1497 p++; 1498 if ((!*p) || (*p == '*')) { 1499 (void)strlcpy(host, "*", sizeof(host)); 1500 continue; 1501 } 1502 if (*p == '@') 1503 p = LocalHostName; 1504 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1505 if (!isalnum(*p) && *p != '.' && *p != '-' 1506 && *p != ',') 1507 break; 1508 host[i] = *p++; 1509 } 1510 host[i] = '\0'; 1511 continue; 1512 } 1513 if (*p == '!') { 1514 p++; 1515 while (isspace(*p)) p++; 1516 if ((!*p) || (*p == '*')) { 1517 (void)strlcpy(prog, "*", sizeof(prog)); 1518 continue; 1519 } 1520 for (i = 0; i < NAME_MAX; i++) { 1521 if (!isprint(p[i])) 1522 break; 1523 prog[i] = p[i]; 1524 } 1525 prog[i] = 0; 1526 continue; 1527 } 1528 for (p = strchr(cline, '\0'); isspace(*--p);) 1529 continue; 1530 *++p = '\0'; 1531 f = (struct filed *)calloc(1, sizeof(*f)); 1532 if (f == NULL) { 1533 logerror("calloc"); 1534 exit(1); 1535 } 1536 *nextp = f; 1537 nextp = &f->f_next; 1538 cfline(cline, f, prog, host); 1539 } 1540 1541 /* close the configuration file */ 1542 (void)fclose(cf); 1543 1544 Initialized = 1; 1545 1546 if (Debug) { 1547 for (f = Files; f; f = f->f_next) { 1548 for (i = 0; i <= LOG_NFACILITIES; i++) 1549 if (f->f_pmask[i] == INTERNAL_NOPRI) 1550 printf("X "); 1551 else 1552 printf("%d ", f->f_pmask[i]); 1553 printf("%s: ", TypeNames[f->f_type]); 1554 switch (f->f_type) { 1555 case F_FILE: 1556 printf("%s", f->f_un.f_fname); 1557 break; 1558 1559 case F_CONSOLE: 1560 case F_TTY: 1561 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1562 break; 1563 1564 case F_FORW: 1565 printf("%s", f->f_un.f_forw.f_hname); 1566 break; 1567 1568 case F_PIPE: 1569 printf("%s", f->f_un.f_pipe.f_pname); 1570 break; 1571 1572 case F_USERS: 1573 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1574 printf("%s, ", f->f_un.f_uname[i]); 1575 break; 1576 } 1577 if (f->f_program) 1578 printf(" (%s)", f->f_program); 1579 printf("\n"); 1580 } 1581 } 1582 1583 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1584 dprintf("syslogd: restarted\n"); 1585 /* 1586 * Log a change in hostname, but only on a restart. 1587 */ 1588 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1589 (void)snprintf(hostMsg, sizeof(hostMsg), 1590 "syslogd: hostname changed, \"%s\" to \"%s\"", 1591 oldLocalHostName, LocalHostName); 1592 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1593 dprintf("%s\n", hostMsg); 1594 } 1595 /* 1596 * Log the kernel boot file if we aren't going to use it as 1597 * the prefix, and if this is *not* a restart. 1598 */ 1599 if (signo == 0 && !use_bootfile) { 1600 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1601 "syslogd: kernel boot file is %s", bootfile); 1602 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1603 dprintf("%s\n", bootfileMsg); 1604 } 1605} 1606 1607/* 1608 * Crack a configuration file line 1609 */ 1610static void 1611cfline(const char *line, struct filed *f, const char *prog, const char *host) 1612{ 1613 struct addrinfo hints, *res; 1614 int error, i, pri; 1615 const char *p, *q; 1616 char *bp; 1617 char buf[MAXLINE], ebuf[100]; 1618 1619 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1620 1621 errno = 0; /* keep strerror() stuff out of logerror messages */ 1622 1623 /* clear out file entry */ 1624 memset(f, 0, sizeof(*f)); 1625 for (i = 0; i <= LOG_NFACILITIES; i++) 1626 f->f_pmask[i] = INTERNAL_NOPRI; 1627 1628 /* save hostname if any */ 1629 if (host && *host == '*') 1630 host = NULL; 1631 if (host) { 1632 int hl; 1633 1634 f->f_host = strdup(host); 1635 if (f->f_host == NULL) { 1636 logerror("strdup"); 1637 exit(1); 1638 } 1639 hl = strlen(f->f_host); 1640 if (hl > 0 && f->f_host[hl-1] == '.') 1641 f->f_host[--hl] = '\0'; 1642 trimdomain(f->f_host, hl); 1643 } 1644 1645 /* save program name if any */ 1646 if (prog && *prog == '*') 1647 prog = NULL; 1648 if (prog) { 1649 f->f_program = strdup(prog); 1650 if (f->f_program == NULL) { 1651 logerror("strdup"); 1652 exit(1); 1653 } 1654 } 1655 1656 /* scan through the list of selectors */ 1657 for (p = line; *p && *p != '\t' && *p != ' ';) { 1658 int pri_done; 1659 int pri_cmp; 1660 int pri_invert; 1661 1662 /* find the end of this facility name list */ 1663 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1664 continue; 1665 1666 /* get the priority comparison */ 1667 pri_cmp = 0; 1668 pri_done = 0; 1669 pri_invert = 0; 1670 if (*q == '!') { 1671 pri_invert = 1; 1672 q++; 1673 } 1674 while (!pri_done) { 1675 switch (*q) { 1676 case '<': 1677 pri_cmp |= PRI_LT; 1678 q++; 1679 break; 1680 case '=': 1681 pri_cmp |= PRI_EQ; 1682 q++; 1683 break; 1684 case '>': 1685 pri_cmp |= PRI_GT; 1686 q++; 1687 break; 1688 default: 1689 pri_done++; 1690 break; 1691 } 1692 } 1693 1694 /* collect priority name */ 1695 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1696 *bp++ = *q++; 1697 *bp = '\0'; 1698 1699 /* skip cruft */ 1700 while (strchr(",;", *q)) 1701 q++; 1702 1703 /* decode priority name */ 1704 if (*buf == '*') { 1705 pri = LOG_PRIMASK + 1; 1706 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1707 } else { 1708 pri = decode(buf, prioritynames); 1709 if (pri < 0) { 1710 (void)snprintf(ebuf, sizeof ebuf, 1711 "unknown priority name \"%s\"", buf); 1712 logerror(ebuf); 1713 return; 1714 } 1715 } 1716 if (!pri_cmp) 1717 pri_cmp = (UniquePriority) 1718 ? (PRI_EQ) 1719 : (PRI_EQ | PRI_GT) 1720 ; 1721 if (pri_invert) 1722 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1723 1724 /* scan facilities */ 1725 while (*p && !strchr("\t.; ", *p)) { 1726 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1727 *bp++ = *p++; 1728 *bp = '\0'; 1729 1730 if (*buf == '*') { 1731 for (i = 0; i < LOG_NFACILITIES; i++) { 1732 f->f_pmask[i] = pri; 1733 f->f_pcmp[i] = pri_cmp; 1734 } 1735 } else { 1736 i = decode(buf, facilitynames); 1737 if (i < 0) { 1738 (void)snprintf(ebuf, sizeof ebuf, 1739 "unknown facility name \"%s\"", 1740 buf); 1741 logerror(ebuf); 1742 return; 1743 } 1744 f->f_pmask[i >> 3] = pri; 1745 f->f_pcmp[i >> 3] = pri_cmp; 1746 } 1747 while (*p == ',' || *p == ' ') 1748 p++; 1749 } 1750 1751 p = q; 1752 } 1753 1754 /* skip to action part */ 1755 while (*p == '\t' || *p == ' ') 1756 p++; 1757 1758 switch (*p) { 1759 case '@': 1760 (void)strlcpy(f->f_un.f_forw.f_hname, ++p, 1761 sizeof(f->f_un.f_forw.f_hname)); 1762 memset(&hints, 0, sizeof(hints)); 1763 hints.ai_family = family; 1764 hints.ai_socktype = SOCK_DGRAM; 1765 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1766 &res); 1767 if (error) { 1768 logerror(gai_strerror(error)); 1769 break; 1770 } 1771 f->f_un.f_forw.f_addr = res; 1772 f->f_type = F_FORW; 1773 break; 1774 1775 case '/': 1776 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1777 f->f_type = F_UNUSED; 1778 logerror(p); 1779 break; 1780 } 1781 if (isatty(f->f_file)) { 1782 if (strcmp(p, ctty) == 0) 1783 f->f_type = F_CONSOLE; 1784 else 1785 f->f_type = F_TTY; 1786 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1787 sizeof(f->f_un.f_fname)); 1788 } else { 1789 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1790 f->f_type = F_FILE; 1791 } 1792 break; 1793 1794 case '|': 1795 f->f_un.f_pipe.f_pid = 0; 1796 (void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname)); 1797 f->f_type = F_PIPE; 1798 break; 1799 1800 case '*': 1801 f->f_type = F_WALL; 1802 break; 1803 1804 default: 1805 for (i = 0; i < MAXUNAMES && *p; i++) { 1806 for (q = p; *q && *q != ','; ) 1807 q++; 1808 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1809 if ((q - p) > UT_NAMESIZE) 1810 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1811 else 1812 f->f_un.f_uname[i][q - p] = '\0'; 1813 while (*q == ',' || *q == ' ') 1814 q++; 1815 p = q; 1816 } 1817 f->f_type = F_USERS; 1818 break; 1819 } 1820} 1821 1822 1823/* 1824 * Decode a symbolic name to a numeric value 1825 */ 1826static int 1827decode(const char *name, CODE *codetab) 1828{ 1829 CODE *c; 1830 char *p, buf[40]; 1831 1832 if (isdigit(*name)) 1833 return (atoi(name)); 1834 1835 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1836 if (isupper(*name)) 1837 *p = tolower(*name); 1838 else 1839 *p = *name; 1840 } 1841 *p = '\0'; 1842 for (c = codetab; c->c_name; c++) 1843 if (!strcmp(buf, c->c_name)) 1844 return (c->c_val); 1845 1846 return (-1); 1847} 1848 1849static void 1850markit(void) 1851{ 1852 struct filed *f; 1853 dq_t q, next; 1854 1855 now = time((time_t *)NULL); 1856 MarkSeq += TIMERINTVL; 1857 if (MarkSeq >= MarkInterval) { 1858 logmsg(LOG_INFO, "-- MARK --", 1859 LocalHostName, ADDDATE|MARK); 1860 MarkSeq = 0; 1861 } 1862 1863 for (f = Files; f; f = f->f_next) { 1864 if (f->f_prevcount && now >= REPEATTIME(f)) { 1865 dprintf("flush %s: repeated %d times, %d sec.\n", 1866 TypeNames[f->f_type], f->f_prevcount, 1867 repeatinterval[f->f_repeatcount]); 1868 fprintlog(f, 0, (char *)NULL); 1869 BACKOFF(f); 1870 } 1871 } 1872 1873 /* Walk the dead queue, and see if we should signal somebody. */ 1874 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 1875 next = TAILQ_NEXT(q, dq_entries); 1876 1877 switch (q->dq_timeout) { 1878 case 0: 1879 /* Already signalled once, try harder now. */ 1880 if (kill(q->dq_pid, SIGKILL) != 0) 1881 (void)deadq_remove(q->dq_pid); 1882 break; 1883 1884 case 1: 1885 /* 1886 * Timed out on dead queue, send terminate 1887 * signal. Note that we leave the removal 1888 * from the dead queue to reapchild(), which 1889 * will also log the event (unless the process 1890 * didn't even really exist, in case we simply 1891 * drop it from the dead queue). 1892 */ 1893 if (kill(q->dq_pid, SIGTERM) != 0) 1894 (void)deadq_remove(q->dq_pid); 1895 /* FALLTHROUGH */ 1896 1897 default: 1898 q->dq_timeout--; 1899 } 1900 } 1901 MarkSet = 0; 1902 (void)alarm(TIMERINTVL); 1903} 1904 1905/* 1906 * fork off and become a daemon, but wait for the child to come online 1907 * before returing to the parent, or we get disk thrashing at boot etc. 1908 * Set a timer so we don't hang forever if it wedges. 1909 */ 1910static int 1911waitdaemon(int nochdir, int noclose, int maxwait) 1912{ 1913 int fd; 1914 int status; 1915 pid_t pid, childpid; 1916 1917 switch (childpid = fork()) { 1918 case -1: 1919 return (-1); 1920 case 0: 1921 break; 1922 default: 1923 signal(SIGALRM, timedout); 1924 alarm(maxwait); 1925 while ((pid = wait3(&status, 0, NULL)) != -1) { 1926 if (WIFEXITED(status)) 1927 errx(1, "child pid %d exited with return code %d", 1928 pid, WEXITSTATUS(status)); 1929 if (WIFSIGNALED(status)) 1930 errx(1, "child pid %d exited on signal %d%s", 1931 pid, WTERMSIG(status), 1932 WCOREDUMP(status) ? " (core dumped)" : 1933 ""); 1934 if (pid == childpid) /* it's gone... */ 1935 break; 1936 } 1937 exit(0); 1938 } 1939 1940 if (setsid() == -1) 1941 return (-1); 1942 1943 if (!nochdir) 1944 (void)chdir("/"); 1945 1946 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1947 (void)dup2(fd, STDIN_FILENO); 1948 (void)dup2(fd, STDOUT_FILENO); 1949 (void)dup2(fd, STDERR_FILENO); 1950 if (fd > 2) 1951 (void)close (fd); 1952 } 1953 return (getppid()); 1954} 1955 1956/* 1957 * We get a SIGALRM from the child when it's running and finished doing it's 1958 * fsync()'s or O_SYNC writes for all the boot messages. 1959 * 1960 * We also get a signal from the kernel if the timer expires, so check to 1961 * see what happened. 1962 */ 1963static void 1964timedout(int sig __unused) 1965{ 1966 int left; 1967 left = alarm(0); 1968 signal(SIGALRM, SIG_DFL); 1969 if (left == 0) 1970 errx(1, "timed out waiting for child"); 1971 else 1972 _exit(0); 1973} 1974 1975/* 1976 * Add `s' to the list of allowable peer addresses to accept messages 1977 * from. 1978 * 1979 * `s' is a string in the form: 1980 * 1981 * [*]domainname[:{servicename|portnumber|*}] 1982 * 1983 * or 1984 * 1985 * netaddr/maskbits[:{servicename|portnumber|*}] 1986 * 1987 * Returns -1 on error, 0 if the argument was valid. 1988 */ 1989static int 1990allowaddr(char *s) 1991{ 1992 char *cp1, *cp2; 1993 struct allowedpeer ap; 1994 struct servent *se; 1995 int masklen = -1, i; 1996 struct addrinfo hints, *res; 1997 struct in_addr *addrp, *maskp; 1998 u_int32_t *addr6p, *mask6p; 1999 char ip[NI_MAXHOST]; 2000 2001#ifdef INET6 2002 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2003#endif 2004 cp1 = s; 2005 if ((cp1 = strrchr(cp1, ':'))) { 2006 /* service/port provided */ 2007 *cp1++ = '\0'; 2008 if (strlen(cp1) == 1 && *cp1 == '*') 2009 /* any port allowed */ 2010 ap.port = 0; 2011 else if ((se = getservbyname(cp1, "udp"))) { 2012 ap.port = ntohs(se->s_port); 2013 } else { 2014 ap.port = strtol(cp1, &cp2, 0); 2015 if (*cp2 != '\0') 2016 return (-1); /* port not numeric */ 2017 } 2018 } else { 2019 if ((se = getservbyname("syslog", "udp"))) 2020 ap.port = ntohs(se->s_port); 2021 else 2022 /* sanity, should not happen */ 2023 ap.port = 514; 2024 } 2025 2026 if ((cp1 = strchr(s, '/')) != NULL && 2027 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2028 *cp1 = '\0'; 2029 if ((masklen = atoi(cp1 + 1)) < 0) 2030 return (-1); 2031 } 2032#ifdef INET6 2033 if (*s == '[') { 2034 cp2 = s + strlen(s) - 1; 2035 if (*cp2 == ']') { 2036 ++s; 2037 *cp2 = '\0'; 2038 } else { 2039 cp2 = NULL; 2040 } 2041 } else { 2042 cp2 = NULL; 2043 } 2044#endif 2045 memset(&hints, 0, sizeof(hints)); 2046 hints.ai_family = PF_UNSPEC; 2047 hints.ai_socktype = SOCK_DGRAM; 2048 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2049 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2050 ap.isnumeric = 1; 2051 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2052 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2053 ap.a_mask.ss_family = res->ai_family; 2054 if (res->ai_family == AF_INET) { 2055 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2056 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2057 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2058 if (masklen < 0) { 2059 /* use default netmask */ 2060 if (IN_CLASSA(ntohl(addrp->s_addr))) 2061 maskp->s_addr = htonl(IN_CLASSA_NET); 2062 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2063 maskp->s_addr = htonl(IN_CLASSB_NET); 2064 else 2065 maskp->s_addr = htonl(IN_CLASSC_NET); 2066 } else if (masklen <= 32) { 2067 /* convert masklen to netmask */ 2068 if (masklen == 0) 2069 maskp->s_addr = 0; 2070 else 2071 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2072 } else { 2073 freeaddrinfo(res); 2074 return (-1); 2075 } 2076 /* Lose any host bits in the network number. */ 2077 addrp->s_addr &= maskp->s_addr; 2078 } 2079#ifdef INET6 2080 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2081 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2082 if (masklen < 0) 2083 masklen = 128; 2084 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2085 /* convert masklen to netmask */ 2086 while (masklen > 0) { 2087 if (masklen < 32) { 2088 *mask6p = htonl(~(0xffffffff >> masklen)); 2089 break; 2090 } 2091 *mask6p++ = 0xffffffff; 2092 masklen -= 32; 2093 } 2094 /* Lose any host bits in the network number. */ 2095 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2096 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2097 for (i = 0; i < 4; i++) 2098 addr6p[i] &= mask6p[i]; 2099 } 2100#endif 2101 else { 2102 freeaddrinfo(res); 2103 return (-1); 2104 } 2105 freeaddrinfo(res); 2106 } else { 2107 /* arg `s' is domain name */ 2108 ap.isnumeric = 0; 2109 ap.a_name = s; 2110 if (cp1) 2111 *cp1 = '/'; 2112#ifdef INET6 2113 if (cp2) { 2114 *cp2 = ']'; 2115 --s; 2116 } 2117#endif 2118 } 2119 2120 if (Debug) { 2121 printf("allowaddr: rule %d: ", NumAllowed); 2122 if (ap.isnumeric) { 2123 printf("numeric, "); 2124 getnameinfo((struct sockaddr *)&ap.a_addr, 2125 ((struct sockaddr *)&ap.a_addr)->sa_len, 2126 ip, sizeof ip, NULL, 0, 2127 NI_NUMERICHOST | withscopeid); 2128 printf("addr = %s, ", ip); 2129 getnameinfo((struct sockaddr *)&ap.a_mask, 2130 ((struct sockaddr *)&ap.a_mask)->sa_len, 2131 ip, sizeof ip, NULL, 0, 2132 NI_NUMERICHOST | withscopeid); 2133 printf("mask = %s; ", ip); 2134 } else { 2135 printf("domainname = %s; ", ap.a_name); 2136 } 2137 printf("port = %d\n", ap.port); 2138 } 2139 2140 if ((AllowedPeers = realloc(AllowedPeers, 2141 ++NumAllowed * sizeof(struct allowedpeer))) 2142 == NULL) { 2143 logerror("realloc"); 2144 exit(1); 2145 } 2146 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2147 return (0); 2148} 2149 2150/* 2151 * Validate that the remote peer has permission to log to us. 2152 */ 2153static int 2154validate(struct sockaddr *sa, const char *hname) 2155{ 2156 int i, j, reject; 2157 size_t l1, l2; 2158 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2159 struct allowedpeer *ap; 2160 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2161 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2162 struct addrinfo hints, *res; 2163 u_short sport; 2164 2165 if (NumAllowed == 0) 2166 /* traditional behaviour, allow everything */ 2167 return (1); 2168 2169 (void)strlcpy(name, hname, sizeof(name)); 2170 memset(&hints, 0, sizeof(hints)); 2171 hints.ai_family = PF_UNSPEC; 2172 hints.ai_socktype = SOCK_DGRAM; 2173 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2174 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2175 freeaddrinfo(res); 2176 else if (strchr(name, '.') == NULL) { 2177 strlcat(name, ".", sizeof name); 2178 strlcat(name, LocalDomain, sizeof name); 2179 } 2180 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2181 NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0) 2182 return (0); /* for safety, should not occur */ 2183 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2184 ip, port, name); 2185 sport = atoi(port); 2186 2187 /* now, walk down the list */ 2188 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2189 if (ap->port != 0 && ap->port != sport) { 2190 dprintf("rejected in rule %d due to port mismatch.\n", i); 2191 continue; 2192 } 2193 2194 if (ap->isnumeric) { 2195 if (ap->a_addr.ss_family != sa->sa_family) { 2196 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2197 continue; 2198 } 2199 if (ap->a_addr.ss_family == AF_INET) { 2200 sin4 = (struct sockaddr_in *)sa; 2201 a4p = (struct sockaddr_in *)&ap->a_addr; 2202 m4p = (struct sockaddr_in *)&ap->a_mask; 2203 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2204 != a4p->sin_addr.s_addr) { 2205 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2206 continue; 2207 } 2208 } 2209#ifdef INET6 2210 else if (ap->a_addr.ss_family == AF_INET6) { 2211 sin6 = (struct sockaddr_in6 *)sa; 2212 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2213 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2214#ifdef NI_WITHSCOPEID 2215 if (a6p->sin6_scope_id != 0 && 2216 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2217 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2218 continue; 2219 } 2220#endif 2221 reject = 0; 2222 for (j = 0; j < 16; j += 4) { 2223 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2224 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2225 ++reject; 2226 break; 2227 } 2228 } 2229 if (reject) { 2230 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2231 continue; 2232 } 2233 } 2234#endif 2235 else 2236 continue; 2237 } else { 2238 cp = ap->a_name; 2239 l1 = strlen(name); 2240 if (*cp == '*') { 2241 /* allow wildmatch */ 2242 cp++; 2243 l2 = strlen(cp); 2244 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2245 dprintf("rejected in rule %d due to name mismatch.\n", i); 2246 continue; 2247 } 2248 } else { 2249 /* exact match */ 2250 l2 = strlen(cp); 2251 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2252 dprintf("rejected in rule %d due to name mismatch.\n", i); 2253 continue; 2254 } 2255 } 2256 } 2257 dprintf("accepted in rule %d.\n", i); 2258 return (1); /* hooray! */ 2259 } 2260 return (0); 2261} 2262 2263/* 2264 * Fairly similar to popen(3), but returns an open descriptor, as 2265 * opposed to a FILE *. 2266 */ 2267static int 2268p_open(const char *prog, pid_t *pid) 2269{ 2270 int pfd[2], nulldesc, i; 2271 sigset_t omask, mask; 2272 char *argv[4]; /* sh -c cmd NULL */ 2273 char errmsg[200]; 2274 2275 if (pipe(pfd) == -1) 2276 return (-1); 2277 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2278 /* we are royally screwed anyway */ 2279 return (-1); 2280 2281 sigemptyset(&mask); 2282 sigaddset(&mask, SIGALRM); 2283 sigaddset(&mask, SIGHUP); 2284 sigprocmask(SIG_BLOCK, &mask, &omask); 2285 switch ((*pid = fork())) { 2286 case -1: 2287 sigprocmask(SIG_SETMASK, &omask, 0); 2288 close(nulldesc); 2289 return (-1); 2290 2291 case 0: 2292 argv[0] = strdup("sh"); 2293 argv[1] = strdup("-c"); 2294 argv[2] = strdup(prog); 2295 argv[3] = NULL; 2296 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2297 logerror("strdup"); 2298 exit(1); 2299 } 2300 2301 alarm(0); 2302 (void)setsid(); /* Avoid catching SIGHUPs. */ 2303 2304 /* 2305 * Throw away pending signals, and reset signal 2306 * behaviour to standard values. 2307 */ 2308 signal(SIGALRM, SIG_IGN); 2309 signal(SIGHUP, SIG_IGN); 2310 sigprocmask(SIG_SETMASK, &omask, 0); 2311 signal(SIGPIPE, SIG_DFL); 2312 signal(SIGQUIT, SIG_DFL); 2313 signal(SIGALRM, SIG_DFL); 2314 signal(SIGHUP, SIG_DFL); 2315 2316 dup2(pfd[0], STDIN_FILENO); 2317 dup2(nulldesc, STDOUT_FILENO); 2318 dup2(nulldesc, STDERR_FILENO); 2319 for (i = getdtablesize(); i > 2; i--) 2320 (void)close(i); 2321 2322 (void)execvp(_PATH_BSHELL, argv); 2323 _exit(255); 2324 } 2325 2326 sigprocmask(SIG_SETMASK, &omask, 0); 2327 close(nulldesc); 2328 close(pfd[0]); 2329 /* 2330 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2331 * supposed to get an EWOULDBLOCK on writev(2), which is 2332 * caught by the logic above anyway, which will in turn close 2333 * the pipe, and fork a new logging subprocess if necessary. 2334 * The stale subprocess will be killed some time later unless 2335 * it terminated itself due to closing its input pipe (so we 2336 * get rid of really dead puppies). 2337 */ 2338 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2339 /* This is bad. */ 2340 (void)snprintf(errmsg, sizeof errmsg, 2341 "Warning: cannot change pipe to PID %d to " 2342 "non-blocking behaviour.", 2343 (int)*pid); 2344 logerror(errmsg); 2345 } 2346 return (pfd[1]); 2347} 2348 2349static void 2350deadq_enter(pid_t pid, const char *name) 2351{ 2352 dq_t p; 2353 int status; 2354 2355 /* 2356 * Be paranoid, if we can't signal the process, don't enter it 2357 * into the dead queue (perhaps it's already dead). If possible, 2358 * we try to fetch and log the child's status. 2359 */ 2360 if (kill(pid, 0) != 0) { 2361 if (waitpid(pid, &status, WNOHANG) > 0) 2362 log_deadchild(pid, status, name); 2363 return; 2364 } 2365 2366 p = malloc(sizeof(struct deadq_entry)); 2367 if (p == NULL) { 2368 logerror("malloc"); 2369 exit(1); 2370 } 2371 2372 p->dq_pid = pid; 2373 p->dq_timeout = DQ_TIMO_INIT; 2374 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2375} 2376 2377static int 2378deadq_remove(pid_t pid) 2379{ 2380 dq_t q; 2381 2382 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2383 if (q->dq_pid == pid) { 2384 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2385 free(q); 2386 return (1); 2387 } 2388 } 2389 2390 return (0); 2391} 2392 2393static void 2394log_deadchild(pid_t pid, int status, const char *name) 2395{ 2396 int code; 2397 char buf[256]; 2398 const char *reason; 2399 2400 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2401 if (WIFSIGNALED(status)) { 2402 reason = "due to signal"; 2403 code = WTERMSIG(status); 2404 } else { 2405 reason = "with status"; 2406 code = WEXITSTATUS(status); 2407 if (code == 0) 2408 return; 2409 } 2410 (void)snprintf(buf, sizeof buf, 2411 "Logging subprocess %d (%s) exited %s %d.", 2412 pid, name, reason, code); 2413 logerror(buf); 2414} 2415 2416static int * 2417socksetup(int af, const char *bindhostname) 2418{ 2419 struct addrinfo hints, *res, *r; 2420 int error, maxs, *s, *socks; 2421 2422 memset(&hints, 0, sizeof(hints)); 2423 hints.ai_flags = AI_PASSIVE; 2424 hints.ai_family = af; 2425 hints.ai_socktype = SOCK_DGRAM; 2426 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2427 if (error) { 2428 logerror(gai_strerror(error)); 2429 errno = 0; 2430 die(0); 2431 } 2432 2433 /* Count max number of sockets we may open */ 2434 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2435 socks = malloc((maxs+1) * sizeof(int)); 2436 if (socks == NULL) { 2437 logerror("couldn't allocate memory for sockets"); 2438 die(0); 2439 } 2440 2441 *socks = 0; /* num of sockets counter at start of array */ 2442 s = socks + 1; 2443 for (r = res; r; r = r->ai_next) { 2444 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2445 if (*s < 0) { 2446 logerror("socket"); 2447 continue; 2448 } 2449 if (r->ai_family == AF_INET6) { 2450 int on = 1; 2451 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2452 (char *)&on, sizeof (on)) < 0) { 2453 logerror("setsockopt"); 2454 close(*s); 2455 continue; 2456 } 2457 } 2458 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2459 close(*s); 2460 logerror("bind"); 2461 continue; 2462 } 2463 2464 (*socks)++; 2465 s++; 2466 } 2467 2468 if (*socks == 0) { 2469 free(socks); 2470 if (Debug) 2471 return (NULL); 2472 else 2473 die(0); 2474 } 2475 if (res) 2476 freeaddrinfo(res); 2477 2478 return (socks); 2479} 2480