usr.sbin/syslogd/syslogd.c

   1 /*
   2  * Copyright (c) 1983, 1988, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)syslogd.c   8.3 (Berkeley) 4/4/94";
  43 #endif
  44 static const char rcsid[] =
  45   "$FreeBSD: src/usr.sbin/syslogd/syslogd.c,v 1.59.2.26 2003/05/20 17:13:53 gshapiro Exp $";
  46 #endif /* not lint */
  47
  48 /*
  49  *  syslogd -- log system messages
  50  *
  51  * This program implements a system log. It takes a series of lines.
  52  * Each line may have a priority, signified as "<n>" as
  53  * the first characters of the line.  If this is
  54  * not present, a default priority is used.
  55  *
  56  * To kill syslogd, send a signal 15 (terminate).  A signal 1 (hup) will
  57  * cause it to reread its configuration file.
  58  *
  59  * Defined Constants:
  60  *
  61  * MAXLINE -- the maximimum line length that can be handled.
  62  * DEFUPRI -- the default priority for user messages
  63  * DEFSPRI -- the default priority for kernel messages
  64  *
  65  * Author: Eric Allman
  66  * extensive changes by Ralph Campbell
  67  * more extensive changes by Eric Allman (again)
  68  * Extension to log by program name as well as facility and priority
  69  *   by Peter da Silva.
  70  * -u and -v by Harlan Stenn.
  71  * Priority comparison code by Harlan Stenn.
  72  */
  73
  74 #define MAXLINE         1024            /* maximum line length */
  75 #define MAXSVLINE       120             /* maximum saved line length */
  76 #define DEFUPRI         (LOG_USER|LOG_NOTICE)
  77 #define DEFSPRI         (LOG_KERN|LOG_CRIT)
  78 #define TIMERINTVL      30              /* interval for checking flush, mark */
  79 #define TTYMSGTIME      1               /* timed out passed to ttymsg */
  80
  81 #include <sys/param.h>
  82 #include <sys/ioctl.h>
  83 #include <sys/stat.h>
  84 #include <sys/wait.h>
  85 #include <sys/socket.h>
  86 #include <sys/queue.h>
  87 #include <sys/uio.h>
  88 #include <sys/un.h>
  89 #include <sys/time.h>
  90 #include <sys/resource.h>
  91 #include <sys/syslimits.h>
  92 #include <sys/types.h>
  93
  94 #include <netinet/in.h>
  95 #include <netdb.h>
  96 #include <arpa/inet.h>
  97
  98 #include <ctype.h>
  99 #include <err.h>
 100 #include <errno.h>
 101 #include <fcntl.h>
 102 #include <libutil.h>
 103 #include <limits.h>
 104 #include <paths.h>
 105 #include <signal.h>
 106 #include <stdio.h>
 107 #include <stdlib.h>
 108 #include <string.h>
 109 #include <sysexits.h>
 110 #include <unistd.h>
 111 #include <utmp.h>
 112
 113 #include "pathnames.h"
 114 #include "ttymsg.h"
 115
 116 #define SYSLOG_NAMES
 117 #include <sys/syslog.h>
 118
 119 #ifdef NI_WITHSCOPEID
 120 static const int withscopeid = NI_WITHSCOPEID;
 121 #else
 122 static const int withscopeid;
 123 #endif
 124
 125 const char      *ConfFile = _PATH_LOGCONF;
 126 const char      *PidFile = _PATH_LOGPID;
 127 const char      ctty[] = _PATH_CONSOLE;
 128
 129 #define dprintf         if (Debug) printf
 130
 131 #define MAXUNAMES       20      /* maximum number of user names */
 132
 133 #define MAXFUNIX       20
 134
 135 int nfunix = 1;
 136 const char *funixn[MAXFUNIX] = { _PATH_LOG };
 137 int funix[MAXFUNIX];
 138
 139 /*
 140  * Flags to logmsg().
 141  */
 142
 143 #define IGN_CONS        0x001   /* don't print on console */
 144 #define SYNC_FILE       0x002   /* do fsync on file after printing */
 145 #define ADDDATE         0x004   /* add a date to the message */
 146 #define MARK            0x008   /* this message is a mark */
 147 #define ISKERNEL        0x010   /* kernel generated message */
 148
 149 /*
 150  * This structure represents the files that will have log
 151  * copies printed.
 152  */
 153
 154 struct filed {
 155         struct  filed *f_next;          /* next in linked list */
 156         short   f_type;                 /* entry type, see below */
 157         short   f_file;                 /* file descriptor */
 158         time_t  f_time;                 /* time this was last written */
 159         char    *f_host;                /* host from which to recd. */
 160         u_char  f_pmask[LOG_NFACILITIES+1];     /* priority mask */
 161         u_char  f_pcmp[LOG_NFACILITIES+1];      /* compare priority */
 162 #define PRI_LT  0x1
 163 #define PRI_EQ  0x2
 164 #define PRI_GT  0x4
 165         char    *f_program;             /* program this applies to */
 166         union {
 167                 char    f_uname[MAXUNAMES][UT_NAMESIZE+1];
 168                 struct {
 169                         char    f_hname[MAXHOSTNAMELEN];
 170                         struct addrinfo *f_addr;
 171
 172                 } f_forw;               /* forwarding address */
 173                 char    f_fname[MAXPATHLEN];
 174                 struct {
 175                         char    f_pname[MAXPATHLEN];
 176                         pid_t   f_pid;
 177                 } f_pipe;
 178         } f_un;
 179         char    f_prevline[MAXSVLINE];          /* last message logged */
 180         char    f_lasttime[16];                 /* time of last occurrence */
 181         char    f_prevhost[MAXHOSTNAMELEN];     /* host from which recd. */
 182         int     f_prevpri;                      /* pri of f_prevline */
 183         int     f_prevlen;                      /* length of f_prevline */
 184         int     f_prevcount;                    /* repetition cnt of prevline */
 185         u_int   f_repeatcount;                  /* number of "repeated" msgs */
 186 };
 187
 188 /*
 189  * Queue of about-to-be dead processes we should watch out for.
 190  */
 191
 192 TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
 193 struct stailhead *deadq_headp;
 194
 195 struct deadq_entry {
 196         pid_t                           dq_pid;
 197         int                             dq_timeout;
 198         TAILQ_ENTRY(deadq_entry)        dq_entries;
 199 };
 200
 201 /*
 202  * The timeout to apply to processes waiting on the dead queue.  Unit
 203  * of measure is `mark intervals', i.e. 20 minutes by default.
 204  * Processes on the dead queue will be terminated after that time.
 205  */
 206
 207 #define DQ_TIMO_INIT    2
 208
 209 typedef struct deadq_entry *dq_t;
 210
 211
 212 /*
 213  * Struct to hold records of network addresses that are allowed to log
 214  * to us.
 215  */
 216 struct allowedpeer {
 217         int isnumeric;
 218         u_short port;
 219         union {
 220                 struct {
 221                         struct sockaddr_storage addr;
 222                         struct sockaddr_storage mask;
 223                 } numeric;
 224                 char *name;
 225         } u;
 226 #define a_addr u.numeric.addr
 227 #define a_mask u.numeric.mask
 228 #define a_name u.name
 229 };
 230
 231
 232 /*
 233  * Intervals at which we flush out "message repeated" messages,
 234  * in seconds after previous message is logged.  After each flush,
 235  * we move to the next interval until we reach the largest.
 236  */
 237 int     repeatinterval[] = { 30, 120, 600 };    /* # of secs before flush */
 238 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
 239 #define REPEATTIME(f)   ((f)->f_time + repeatinterval[(f)->f_repeatcount])
 240 #define BACKOFF(f)      { if (++(f)->f_repeatcount > MAXREPEAT) \
 241                                  (f)->f_repeatcount = MAXREPEAT; \
 242                         }
 243
 244 /* values for f_type */
 245 #define F_UNUSED        0               /* unused entry */
 246 #define F_FILE          1               /* regular file */
 247 #define F_TTY           2               /* terminal */
 248 #define F_CONSOLE       3               /* console terminal */
 249 #define F_FORW          4               /* remote machine */
 250 #define F_USERS         5               /* list of users */
 251 #define F_WALL          6               /* everyone logged on */
 252 #define F_PIPE          7               /* pipe to program */
 253
 254 const char *TypeNames[8] = {
 255         "UNUSED",       "FILE",         "TTY",          "CONSOLE",
 256         "FORW",         "USERS",        "WALL",         "PIPE"
 257 };
 258
 259 static struct filed *Files;     /* Log files that we write to */
 260 static struct filed consfile;   /* Console */
 261
 262 static int      Debug;          /* debug flag */
 263 static int      resolve = 1;    /* resolve hostname */
 264 static char     LocalHostName[MAXHOSTNAMELEN];  /* our hostname */
 265 static char     *LocalDomain;   /* our local domain name */
 266 static int      *finet;         /* Internet datagram socket */
 267 static int      fklog = -1;     /* /dev/klog */
 268 static int      Initialized;    /* set when we have initialized ourselves */
 269 static int      MarkInterval = 20 * 60; /* interval between marks in seconds */
 270 static int      MarkSeq;        /* mark sequence number */
 271 static int      SecureMode;     /* when true, receive only unix domain socks */
 272 #ifdef INET6
 273 static int      family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
 274 #else
 275 static int      family = PF_INET; /* protocol family (IPv4 only) */
 276 #endif
 277 static int      send_to_all;    /* send message to all IPv4/IPv6 addresses */
 278 static int      no_compress;    /* don't compress messages (1=pipes, 2=all) */
 279
 280 static char     bootfile[MAXLINE+1]; /* booted kernel file */
 281
 282 struct allowedpeer *AllowedPeers; /* List of allowed peers */
 283 static int      NumAllowed;     /* Number of entries in AllowedPeers */
 284
 285 static int      UniquePriority; /* Only log specified priority? */
 286 static int      LogFacPri;      /* Put facility and priority in log message: */
 287                                 /* 0=no, 1=numeric, 2=names */
 288 static int      KeepKernFac;    /* Keep remotely logged kernel facility */
 289
 290 volatile sig_atomic_t MarkSet, WantDie;
 291
 292 static int      allowaddr(char *);
 293 static void     cfline(const char *, struct filed *,
 294                     const char *, const char *);
 295 static const char *cvthname(struct sockaddr *);
 296 static void     deadq_enter(pid_t, const char *);
 297 static int      deadq_remove(pid_t);
 298 static int      decode(const char *, CODE *);
 299 static void     die(int);
 300 static void     dodie(int);
 301 static void     domark(int);
 302 static void     fprintlog(struct filed *, int, const char *);
 303 static int      *socksetup(int, const char *);
 304 static void     init(int);
 305 static void     logerror(const char *);
 306 static void     logmsg(int, const char *, const char *, int);
 307 static void     log_deadchild(pid_t, int, const char *);
 308 static void     markit(void);
 309 static void     printline(const char *, char *);
 310 static void     printsys(char *);
 311 static int      p_open(const char *, pid_t *);
 312 static void     readklog(void);
 313 static void     reapchild(int);
 314 static void     usage(void);
 315 static int      validate(struct sockaddr *, const char *);
 316 static void     unmapped(struct sockaddr *);
 317 static void     wallmsg(struct filed *, struct iovec *);
 318 static int      waitdaemon(int, int, int);
 319 static void     timedout(int);
 320
 321 int
 322 main(int argc, char *argv[])
 323 {
 324         int ch, i, fdsrmax = 0, l;
 325         struct sockaddr_un sunx, fromunix;
 326         struct sockaddr_storage frominet;
 327         fd_set *fdsr = NULL;
 328         FILE *fp;
 329         char line[MAXLINE + 1];
 330         const char *bindhostname, *hname;
 331         struct timeval tv, *tvp;
 332         struct sigaction sact;
 333         sigset_t mask;
 334         pid_t ppid = 1;
 335         socklen_t len;
 336
 337         bindhostname = NULL;
 338         while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:np:P:suv")) != -1)
 339                 switch (ch) {
 340                 case '4':
 341                         family = PF_INET;
 342                         break;
 343 #ifdef INET6
 344                 case '6':
 345                         family = PF_INET6;
 346                         break;
 347 #endif
 348                 case 'A':
 349                         send_to_all++;
 350                         break;
 351                 case 'a':               /* allow specific network addresses only */
 352                         if (allowaddr(optarg) == -1)
 353                                 usage();
 354                         break;
 355                 case 'b':
 356                         bindhostname = optarg;
 357                         break;
 358                 case 'c':
 359                         no_compress++;
 360                         break;
 361                 case 'd':               /* debug */
 362                         Debug++;
 363                         break;
 364                 case 'f':               /* configuration file */
 365                         ConfFile = optarg;
 366                         break;
 367                 case 'k':               /* keep remote kern fac */
 368                         KeepKernFac = 1;
 369                         break;
 370                 case 'l':
 371                         if (nfunix < MAXFUNIX)
 372                                 funixn[nfunix++] = optarg;
 373                         else
 374                                 warnx("out of descriptors, ignoring %s",
 375                                         optarg);
 376                         break;
 377                 case 'm':               /* mark interval */
 378                         MarkInterval = atoi(optarg) * 60;
 379                         break;
 380                 case 'n':
 381                         resolve = 0;
 382                         break;
 383                 case 'p':               /* path */
 384                         funixn[0] = optarg;
 385                         break;
 386                 case 'P':               /* path for alt. PID */
 387                         PidFile = optarg;
 388                         break;
 389                 case 's':               /* no network mode */
 390                         SecureMode++;
 391                         break;
 392                 case 'u':               /* only log specified priority */
 393                         UniquePriority++;
 394                         break;
 395                 case 'v':               /* log facility and priority */
 396                         LogFacPri++;
 397                         break;
 398                 case '?':
 399                 default:
 400                         usage();
 401                 }
 402         if ((argc -= optind) != 0)
 403                 usage();
 404
 405         if (!Debug) {
 406                 ppid = waitdaemon(0, 0, 30);
 407                 if (ppid < 0)
 408                         err(1, "could not become daemon");
 409         } else {
 410                 setlinebuf(stdout);
 411         }
 412
 413         if (NumAllowed)
 414                 endservent();
 415
 416         consfile.f_type = F_CONSOLE;
 417         (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
 418             sizeof(consfile.f_un.f_fname));
 419         (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
 420         (void)signal(SIGTERM, dodie);
 421         (void)signal(SIGINT, Debug ? dodie : SIG_IGN);
 422         (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
 423         /*
 424          * We don't want the SIGCHLD and SIGHUP handlers to interfere
 425          * with each other; they are likely candidates for being called
 426          * simultaneously (SIGHUP closes pipe descriptor, process dies,
 427          * SIGCHLD happens).
 428          */
 429         sigemptyset(&mask);
 430         sigaddset(&mask, SIGHUP);
 431         sact.sa_handler = reapchild;
 432         sact.sa_mask = mask;
 433         sact.sa_flags = SA_RESTART;
 434         (void)sigaction(SIGCHLD, &sact, NULL);
 435         (void)signal(SIGALRM, domark);
 436         (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
 437         (void)alarm(TIMERINTVL);
 438
 439         TAILQ_INIT(&deadq_head);
 440
 441 #ifndef SUN_LEN
 442 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
 443 #endif
 444         for (i = 0; i < nfunix; i++) {
 445                 (void)unlink(funixn[i]);
 446                 memset(&sunx, 0, sizeof(sunx));
 447                 sunx.sun_family = AF_UNIX;
 448                 (void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path));
 449                 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0);
 450                 if (funix[i] < 0 ||
 451                     bind(funix[i], (struct sockaddr *)&sunx,
 452                          SUN_LEN(&sunx)) < 0 ||
 453                     chmod(funixn[i], 0666) < 0) {
 454                         (void)snprintf(line, sizeof line,
 455                                         "cannot create %s", funixn[i]);
 456                         logerror(line);
 457                         dprintf("cannot create %s (%d)\n", funixn[i], errno);
 458                         if (i == 0)
 459                                 die(0);
 460                 }
 461         }
 462         if (SecureMode <= 1)
 463                 finet = socksetup(family, bindhostname);
 464
 465         if (finet) {
 466                 if (SecureMode) {
 467                         for (i = 0; i < *finet; i++) {
 468                                 if (shutdown(finet[i+1], SHUT_RD) < 0) {
 469                                         logerror("shutdown");
 470                                         if (!Debug)
 471                                                 die(0);
 472                                 }
 473                         }
 474                 } else {
 475                         dprintf("listening on inet and/or inet6 socket\n");
 476                 }
 477                 dprintf("sending on inet and/or inet6 socket\n");
 478         }
 479
 480         if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
 481                 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
 482                         fklog = -1;
 483         if (fklog < 0)
 484                 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
 485
 486         /* tuck my process id away */
 487         fp = fopen(PidFile, "w");
 488         if (fp != NULL) {
 489                 fprintf(fp, "%d\n", getpid());
 490                 (void)fclose(fp);
 491         }
 492
 493         dprintf("off & running....\n");
 494
 495         init(0);
 496         /* prevent SIGHUP and SIGCHLD handlers from running in parallel */
 497         sigemptyset(&mask);
 498         sigaddset(&mask, SIGCHLD);
 499         sact.sa_handler = init;
 500         sact.sa_mask = mask;
 501         sact.sa_flags = SA_RESTART;
 502         (void)sigaction(SIGHUP, &sact, NULL);
 503
 504         tvp = &tv;
 505         tv.tv_sec = tv.tv_usec = 0;
 506
 507         if (fklog != -1 && fklog > fdsrmax)
 508                 fdsrmax = fklog;
 509         if (finet && !SecureMode) {
 510                 for (i = 0; i < *finet; i++) {
 511                     if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
 512                         fdsrmax = finet[i+1];
 513                 }
 514         }
 515         for (i = 0; i < nfunix; i++) {
 516                 if (funix[i] != -1 && funix[i] > fdsrmax)
 517                         fdsrmax = funix[i];
 518         }
 519
 520         fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
 521             sizeof(fd_mask));
 522         if (fdsr == NULL)
 523                 errx(1, "calloc fd_set");
 524
 525         for (;;) {
 526                 if (MarkSet)
 527                         markit();
 528                 if (WantDie)
 529                         die(WantDie);
 530
 531                 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
 532                     sizeof(fd_mask));
 533
 534                 if (fklog != -1)
 535                         FD_SET(fklog, fdsr);
 536                 if (finet && !SecureMode) {
 537                         for (i = 0; i < *finet; i++) {
 538                                 if (finet[i+1] != -1)
 539                                         FD_SET(finet[i+1], fdsr);
 540                         }
 541                 }
 542                 for (i = 0; i < nfunix; i++) {
 543                         if (funix[i] != -1)
 544                                 FD_SET(funix[i], fdsr);
 545                 }
 546
 547                 i = select(fdsrmax+1, fdsr, NULL, NULL, tvp);
 548                 switch (i) {
 549                 case 0:
 550                         if (tvp) {
 551                                 tvp = NULL;
 552                                 if (ppid != 1)
 553                                         kill(ppid, SIGALRM);
 554                         }
 555                         continue;
 556                 case -1:
 557                         if (errno != EINTR)
 558                                 logerror("select");
 559                         continue;
 560                 }
 561                 if (fklog != -1 && FD_ISSET(fklog, fdsr))
 562                         readklog();
 563                 if (finet && !SecureMode) {
 564                         for (i = 0; i < *finet; i++) {
 565                                 if (FD_ISSET(finet[i+1], fdsr)) {
 566                                         len = sizeof(frominet);
 567                                         l = recvfrom(finet[i+1], line, MAXLINE,
 568                                              0, (struct sockaddr *)&frominet,
 569                                              &len);
 570                                         if (l > 0) {
 571                                                 line[l] = '\0';
 572                                                 hname = cvthname((struct sockaddr *)&frominet);
 573                                                 unmapped((struct sockaddr *)&frominet);
 574                                                 if (validate((struct sockaddr *)&frominet, hname))
 575                                                         printline(hname, line);
 576                                         } else if (l < 0 && errno != EINTR)
 577                                                 logerror("recvfrom inet");
 578                                 }
 579                         }
 580                 }
 581                 for (i = 0; i < nfunix; i++) {
 582                         if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) {
 583                                 len = sizeof(fromunix);
 584                                 l = recvfrom(funix[i], line, MAXLINE, 0,
 585                                     (struct sockaddr *)&fromunix, &len);
 586                                 if (l > 0) {
 587                                         line[l] = '\0';
 588                                         printline(LocalHostName, line);
 589                                 } else if (l < 0 && errno != EINTR)
 590                                         logerror("recvfrom unix");
 591                         }
 592                 }
 593         }
 594         if (fdsr)
 595                 free(fdsr);
 596 }
 597
 598 static void
 599 unmapped(struct sockaddr *sa)
 600 {
 601         struct sockaddr_in6 *sin6;
 602         struct sockaddr_in sin4;
 603
 604         if (sa->sa_family != AF_INET6)
 605                 return;
 606         if (sa->sa_len != sizeof(struct sockaddr_in6) ||
 607             sizeof(sin4) > sa->sa_len)
 608                 return;
 609         sin6 = (struct sockaddr_in6 *)sa;
 610         if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
 611                 return;
 612
 613         memset(&sin4, 0, sizeof(sin4));
 614         sin4.sin_family = AF_INET;
 615         sin4.sin_len = sizeof(struct sockaddr_in);
 616         memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
 617                sizeof(sin4.sin_addr));
 618         sin4.sin_port = sin6->sin6_port;
 619
 620         memcpy(sa, &sin4, sin4.sin_len);
 621 }
 622
 623 static void
 624 usage(void)
 625 {
 626
 627         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 628                 "usage: syslogd [-46Acdknsuv] [-a allowed_peer]",
 629                 "               [-b bind address] [-f config_file]",
 630                 "               [-l log_socket] [-m mark_interval]",
 631                 "               [-P pid_file] [-p log_socket]");
 632         exit(1);
 633 }
 634
 635 /*
 636  * Take a raw input line, decode the message, and print the message
 637  * on the appropriate log files.
 638  */
 639 static void
 640 printline(const char *hname, char *msg)
 641 {
 642         int c, pri;
 643         char *p, *q, line[MAXLINE + 1];
 644
 645         /* test for special codes */
 646         pri = DEFUPRI;
 647         p = msg;
 648         if (*p == '<') {
 649                 pri = 0;
 650                 while (isdigit(*++p))
 651                         pri = 10 * pri + (*p - '0');
 652                 if (*p == '>')
 653                         ++p;
 654         }
 655         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
 656                 pri = DEFUPRI;
 657
 658         /* don't allow users to log kernel messages */
 659         if (LOG_FAC(pri) == LOG_KERN && !KeepKernFac)
 660                 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
 661
 662         q = line;
 663
 664         while ((c = (unsigned char)*p++) != '\0' &&
 665             q < &line[sizeof(line) - 4]) {
 666                 if ((c & 0x80) && c < 0xA0) {
 667                         c &= 0x7F;
 668                         *q++ = 'M';
 669                         *q++ = '-';
 670                 }
 671                 if (isascii(c) && iscntrl(c)) {
 672                         if (c == '\n') {
 673                                 *q++ = ' ';
 674                         } else if (c == '\t') {
 675                                 *q++ = '\t';
 676                         } else {
 677                                 *q++ = '^';
 678                                 *q++ = c ^ 0100;
 679                         }
 680                 } else {
 681                         *q++ = c;
 682                 }
 683         }
 684         *q = '\0';
 685
 686         logmsg(pri, line, hname, 0);
 687 }
 688
 689 /*
 690  * Read /dev/klog while data are available, split into lines.
 691  */
 692 static void
 693 readklog(void)
 694 {
 695         char *p, *q, line[MAXLINE + 1];
 696         int len, i;
 697
 698         len = 0;
 699         for (;;) {
 700                 i = read(fklog, line + len, MAXLINE - 1 - len);
 701                 if (i > 0) {
 702                         line[i + len] = '\0';
 703                 } else {
 704                         if (i < 0 && errno != EINTR && errno != EAGAIN) {
 705                                 logerror("klog");
 706                                 fklog = -1;
 707                         }
 708                         break;
 709                 }
 710
 711                 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
 712                         *q = '\0';
 713                         printsys(p);
 714                 }
 715                 len = strlen(p);
 716                 if (len >= MAXLINE - 1) {
 717                         printsys(p);
 718                         len = 0;
 719                 }
 720                 if (len > 0)
 721                         memmove(line, p, len + 1);
 722         }
 723         if (len > 0)
 724                 printsys(line);
 725 }
 726
 727 /*
 728  * Take a raw input line from /dev/klog, format similar to syslog().
 729  */
 730 static void
 731 printsys(char *p)
 732 {
 733         int pri, flags;
 734
 735         flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
 736         pri = DEFSPRI;
 737         if (*p == '<') {
 738                 pri = 0;
 739                 while (isdigit(*++p))
 740                         pri = 10 * pri + (*p - '0');
 741                 if (*p == '>')
 742                         ++p;
 743                 if ((pri & LOG_FACMASK) == LOG_CONSOLE)
 744                         flags |= IGN_CONS;
 745         } else {
 746                 /* kernel printf's come out on console */
 747                 flags |= IGN_CONS;
 748         }
 749         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
 750                 pri = DEFSPRI;
 751         logmsg(pri, p, LocalHostName, flags);
 752 }
 753
 754 static time_t   now;
 755
 756 /*
 757  * Log a message to the appropriate log files, users, etc. based on
 758  * the priority.
 759  */
 760 static void
 761 logmsg(int pri, const char *msg, const char *from, int flags)
 762 {
 763         struct filed *f;
 764         int i, fac, msglen, omask, prilev;
 765         const char *timestamp;
 766         char prog[NAME_MAX+1];
 767         char buf[MAXLINE+1];
 768
 769         dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
 770             pri, flags, from, msg);
 771
 772         omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
 773
 774         /*
 775          * Check to see if msg looks non-standard.
 776          */
 777         msglen = strlen(msg);
 778         if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
 779             msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
 780                 flags |= ADDDATE;
 781
 782         (void)time(&now);
 783         if (flags & ADDDATE) {
 784                 timestamp = ctime(&now) + 4;
 785         } else {
 786                 timestamp = msg;
 787                 msg += 16;
 788                 msglen -= 16;
 789         }
 790
 791         /* skip leading blanks */
 792         while (isspace(*msg)) {
 793                 msg++;
 794                 msglen--;
 795         }
 796
 797         /* extract facility and priority level */
 798         if (flags & MARK)
 799                 fac = LOG_NFACILITIES;
 800         else
 801                 fac = LOG_FAC(pri);
 802         prilev = LOG_PRI(pri);
 803
 804         /* extract program name */
 805         for (i = 0; i < NAME_MAX; i++) {
 806                 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[')
 807                         break;
 808                 prog[i] = msg[i];
 809         }
 810         prog[i] = 0;
 811
 812         /* add kernel prefix for kernel messages */
 813         if (flags & ISKERNEL) {
 814                 snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg);
 815                 msg = buf;
 816                 msglen = strlen(buf);
 817         }
 818
 819         /* log the message to the particular outputs */
 820         if (!Initialized) {
 821                 f = &consfile;
 822                 f->f_file = open(ctty, O_WRONLY, 0);
 823
 824                 if (f->f_file >= 0) {
 825                         (void)strlcpy(f->f_lasttime, timestamp,
 826                                 sizeof(f->f_lasttime));
 827                         fprintlog(f, flags, msg);
 828                         (void)close(f->f_file);
 829                 }
 830                 (void)sigsetmask(omask);
 831                 return;
 832         }
 833         for (f = Files; f; f = f->f_next) {
 834                 /* skip messages that are incorrect priority */
 835                 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
 836                      ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
 837                      ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
 838                      )
 839                     || f->f_pmask[fac] == INTERNAL_NOPRI)
 840                         continue;
 841
 842                 /* skip messages with the incorrect hostname */
 843                 if (f->f_host)
 844                         switch (f->f_host[0]) {
 845                         case '+':
 846                                 if (strcasecmp(from, f->f_host + 1) != 0)
 847                                         continue;
 848                                 break;
 849                         case '-':
 850                                 if (strcasecmp(from, f->f_host + 1) == 0)
 851                                         continue;
 852                                 break;
 853                         }
 854
 855                 /* skip messages with the incorrect program name */
 856                 if (f->f_program)
 857                         switch (f->f_program[0]) {
 858                         case '+':
 859                                 if (strcmp(prog, f->f_program + 1) != 0)
 860                                         continue;
 861                                 break;
 862                         case '-':
 863                                 if (strcmp(prog, f->f_program + 1) == 0)
 864                                         continue;
 865                                 break;
 866                         default:
 867                                 if (strcmp(prog, f->f_program) != 0)
 868                                         continue;
 869                                 break;
 870                         }
 871
 872                 /* skip message to console if it has already been printed */
 873                 if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
 874                         continue;
 875
 876                 /* don't output marks to recently written files */
 877                 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
 878                         continue;
 879
 880                 /*
 881                  * suppress duplicate lines to this file
 882                  */
 883                 if (no_compress - (f->f_type != F_PIPE) < 1 &&
 884                     (flags & MARK) == 0 && msglen == f->f_prevlen &&
 885                     !strcmp(msg, f->f_prevline) &&
 886                     !strcasecmp(from, f->f_prevhost)) {
 887                         (void)strlcpy(f->f_lasttime, timestamp,
 888                                 sizeof(f->f_lasttime));
 889                         f->f_prevcount++;
 890                         dprintf("msg repeated %d times, %ld sec of %d\n",
 891                             f->f_prevcount, (long)(now - f->f_time),
 892                             repeatinterval[f->f_repeatcount]);
 893                         /*
 894                          * If domark would have logged this by now,
 895                          * flush it now (so we don't hold isolated messages),
 896                          * but back off so we'll flush less often
 897                          * in the future.
 898                          */
 899                         if (now > REPEATTIME(f)) {
 900                                 fprintlog(f, flags, (char *)NULL);
 901                                 BACKOFF(f);
 902                         }
 903                 } else {
 904                         /* new line, save it */
 905                         if (f->f_prevcount)
 906                                 fprintlog(f, 0, (char *)NULL);
 907                         f->f_repeatcount = 0;
 908                         f->f_prevpri = pri;
 909                         (void)strlcpy(f->f_lasttime, timestamp,
 910                                 sizeof(f->f_lasttime));
 911                         (void)strlcpy(f->f_prevhost, from,
 912                             sizeof(f->f_prevhost));
 913                         if (msglen < MAXSVLINE) {
 914                                 f->f_prevlen = msglen;
 915                                 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
 916                                 fprintlog(f, flags, (char *)NULL);
 917                         } else {
 918                                 f->f_prevline[0] = 0;
 919                                 f->f_prevlen = 0;
 920                                 fprintlog(f, flags, msg);
 921                         }
 922                 }
 923         }
 924         (void)sigsetmask(omask);
 925 }
 926
 927 static void
 928 fprintlog(struct filed *f, int flags, const char *msg)
 929 {
 930         struct iovec iov[7];
 931         struct iovec *v;
 932         struct addrinfo *r;
 933         int i, l, lsent = 0;
 934         char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
 935         const char *msgret;
 936
 937         v = iov;
 938         if (f->f_type == F_WALL) {
 939                 v->iov_base = greetings;
 940                 v->iov_len = snprintf(greetings, sizeof greetings,
 941                     "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
 942                     f->f_prevhost, ctime(&now));
 943                 if (v->iov_len > 0)
 944                         v++;
 945                 v->iov_base = "";
 946                 v->iov_len = 0;
 947                 v++;
 948         } else {
 949                 v->iov_base = f->f_lasttime;
 950                 v->iov_len = 15;
 951                 v++;
 952                 v->iov_base = " ";
 953                 v->iov_len = 1;
 954                 v++;
 955         }
 956
 957         if (LogFacPri) {
 958                 static char fp_buf[30]; /* Hollow laugh */
 959                 int fac = f->f_prevpri & LOG_FACMASK;
 960                 int pri = LOG_PRI(f->f_prevpri);
 961                 const char *f_s = NULL;
 962                 char f_n[5];    /* Hollow laugh */
 963                 const char *p_s = NULL;
 964                 char p_n[5];    /* Hollow laugh */
 965
 966                 if (LogFacPri > 1) {
 967                   CODE *c;
 968
 969                   for (c = facilitynames; c->c_name; c++) {
 970                     if (c->c_val == fac) {
 971                       f_s = c->c_name;
 972                       break;
 973                     }
 974                   }
 975                   for (c = prioritynames; c->c_name; c++) {
 976                     if (c->c_val == pri) {
 977                       p_s = c->c_name;
 978                       break;
 979                     }
 980                   }
 981                 }
 982                 if (!f_s) {
 983                   snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
 984                   f_s = f_n;
 985                 }
 986                 if (!p_s) {
 987                   snprintf(p_n, sizeof p_n, "%d", pri);
 988                   p_s = p_n;
 989                 }
 990                 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
 991                 v->iov_base = fp_buf;
 992                 v->iov_len = strlen(fp_buf);
 993         } else {
 994                 v->iov_base="";
 995                 v->iov_len = 0;
 996         }
 997         v++;
 998
 999         v->iov_base = f->f_prevhost;
1000         v->iov_len = strlen(v->iov_base);
1001         v++;
1002         v->iov_base = " ";
1003         v->iov_len = 1;
1004         v++;
1005
1006         if (msg) {
1007                 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1008                 if (wmsg == NULL) {
1009                         logerror("strdup");
1010                         exit(1);
1011                 }
1012                 v->iov_base = wmsg;
1013                 v->iov_len = strlen(msg);
1014         } else if (f->f_prevcount > 1) {
1015                 v->iov_base = repbuf;
1016                 v->iov_len = snprintf(repbuf, sizeof repbuf,
1017                     "last message repeated %d times", f->f_prevcount);
1018         } else {
1019                 v->iov_base = f->f_prevline;
1020                 v->iov_len = f->f_prevlen;
1021         }
1022         v++;
1023
1024         dprintf("Logging to %s", TypeNames[f->f_type]);
1025         f->f_time = now;
1026
1027         switch (f->f_type) {
1028         case F_UNUSED:
1029                 dprintf("\n");
1030                 break;
1031
1032         case F_FORW:
1033                 dprintf(" %s\n", f->f_un.f_forw.f_hname);
1034                 /* check for local vs remote messages */
1035                 if (strcasecmp(f->f_prevhost, LocalHostName))
1036                         l = snprintf(line, sizeof line - 1,
1037                             "<%d>%.15s Forwarded from %s: %s",
1038                             f->f_prevpri, iov[0].iov_base, f->f_prevhost,
1039                             iov[5].iov_base);
1040                 else
1041                         l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1042                              f->f_prevpri, iov[0].iov_base, iov[5].iov_base);
1043                 if (l < 0)
1044                         l = 0;
1045                 else if (l > MAXLINE)
1046                         l = MAXLINE;
1047
1048                 if (finet) {
1049                         for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1050                                 for (i = 0; i < *finet; i++) {
1051 #if 0
1052                                         /*
1053                                          * should we check AF first, or just
1054                                          * trial and error? FWD
1055                                          */
1056                                         if (r->ai_family ==
1057                                             address_family_of(finet[i+1]))
1058 #endif
1059                                         lsent = sendto(finet[i+1], line, l, 0,
1060                                             r->ai_addr, r->ai_addrlen);
1061                                         if (lsent == l)
1062                                                 break;
1063                                 }
1064                                 if (lsent == l && !send_to_all)
1065                                         break;
1066                         }
1067                         dprintf("lsent/l: %d/%d\n", lsent, l);
1068                         if (lsent != l) {
1069                                 int e = errno;
1070                                 logerror("sendto");
1071                                 errno = e;
1072                                 switch (errno) {
1073                                 case EHOSTUNREACH:
1074                                 case EHOSTDOWN:
1075                                         break;
1076                                 /* case EBADF: */
1077                                 /* case EACCES: */
1078                                 /* case ENOTSOCK: */
1079                                 /* case EFAULT: */
1080                                 /* case EMSGSIZE: */
1081                                 /* case EAGAIN: */
1082                                 /* case ENOBUFS: */
1083                                 /* case ECONNREFUSED: */
1084                                 default:
1085                                         dprintf("removing entry\n", e);
1086                                         (void)close(f->f_file);
1087                                         f->f_type = F_UNUSED;
1088                                         break;
1089                                 }
1090                         }
1091                 }
1092                 break;
1093
1094         case F_FILE:
1095                 dprintf(" %s\n", f->f_un.f_fname);
1096                 v->iov_base = "\n";
1097                 v->iov_len = 1;
1098                 if (writev(f->f_file, iov, 7) < 0) {
1099                         int e = errno;
1100                         (void)close(f->f_file);
1101                         f->f_type = F_UNUSED;
1102                         errno = e;
1103                         logerror(f->f_un.f_fname);
1104                 } else if (flags & SYNC_FILE)
1105                         (void)fsync(f->f_file);
1106                 break;
1107
1108         case F_PIPE:
1109                 dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1110                 v->iov_base = "\n";
1111                 v->iov_len = 1;
1112                 if (f->f_un.f_pipe.f_pid == 0) {
1113                         if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1114                                                 &f->f_un.f_pipe.f_pid)) < 0) {
1115                                 f->f_type = F_UNUSED;
1116                                 logerror(f->f_un.f_pipe.f_pname);
1117                                 break;
1118                         }
1119                 }
1120                 if (writev(f->f_file, iov, 7) < 0) {
1121                         int e = errno;
1122                         (void)close(f->f_file);
1123                         if (f->f_un.f_pipe.f_pid > 0)
1124                                 deadq_enter(f->f_un.f_pipe.f_pid,
1125                                             f->f_un.f_pipe.f_pname);
1126                         f->f_un.f_pipe.f_pid = 0;
1127                         errno = e;
1128                         logerror(f->f_un.f_pipe.f_pname);
1129                 }
1130                 break;
1131
1132         case F_CONSOLE:
1133                 if (flags & IGN_CONS) {
1134                         dprintf(" (ignored)\n");
1135                         break;
1136                 }
1137                 /* FALLTHROUGH */
1138
1139         case F_TTY:
1140                 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1141                 v->iov_base = "\r\n";
1142                 v->iov_len = 2;
1143
1144                 errno = 0;      /* ttymsg() only sometimes returns an errno */
1145                 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) {
1146                         f->f_type = F_UNUSED;
1147                         logerror(msgret);
1148                 }
1149                 break;
1150
1151         case F_USERS:
1152         case F_WALL:
1153                 dprintf("\n");
1154                 v->iov_base = "\r\n";
1155                 v->iov_len = 2;
1156                 wallmsg(f, iov);
1157                 break;
1158         }
1159         f->f_prevcount = 0;
1160         if (msg)
1161                 free(wmsg);
1162 }
1163
1164 /*
1165  *  WALLMSG -- Write a message to the world at large
1166  *
1167  *      Write the specified message to either the entire
1168  *      world, or a list of approved users.
1169  */
1170 static void
1171 wallmsg(struct filed *f, struct iovec *iov)
1172 {
1173         static int reenter;                     /* avoid calling ourselves */
1174         FILE *uf;
1175         struct utmp ut;
1176         int i;
1177         const char *p;
1178         char line[sizeof(ut.ut_line) + 1];
1179
1180         if (reenter++)
1181                 return;
1182         if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1183                 logerror(_PATH_UTMP);
1184                 reenter = 0;
1185                 return;
1186         }
1187         /* NOSTRICT */
1188         while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1189                 if (ut.ut_name[0] == '\0')
1190                         continue;
1191                 (void)strlcpy(line, ut.ut_line, sizeof(line));
1192                 if (f->f_type == F_WALL) {
1193                         if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) {
1194                                 errno = 0;      /* already in msg */
1195                                 logerror(p);
1196                         }
1197                         continue;
1198                 }
1199                 /* should we send the message to this user? */
1200                 for (i = 0; i < MAXUNAMES; i++) {
1201                         if (!f->f_un.f_uname[i][0])
1202                                 break;
1203                         if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1204                             UT_NAMESIZE)) {
1205                                 if ((p = ttymsg(iov, 7, line, TTYMSGTIME))
1206                                                                 != NULL) {
1207                                         errno = 0;      /* already in msg */
1208                                         logerror(p);
1209                                 }
1210                                 break;
1211                         }
1212                 }
1213         }
1214         (void)fclose(uf);
1215         reenter = 0;
1216 }
1217
1218 static void
1219 reapchild(int signo __unused)
1220 {
1221         int status;
1222         pid_t pid;
1223         struct filed *f;
1224
1225         while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1226                 if (!Initialized)
1227                         /* Don't tell while we are initting. */
1228                         continue;
1229
1230                 /* First, look if it's a process from the dead queue. */
1231                 if (deadq_remove(pid))
1232                         goto oncemore;
1233
1234                 /* Now, look in list of active processes. */
1235                 for (f = Files; f; f = f->f_next)
1236                         if (f->f_type == F_PIPE &&
1237                             f->f_un.f_pipe.f_pid == pid) {
1238                                 (void)close(f->f_file);
1239                                 f->f_un.f_pipe.f_pid = 0;
1240                                 log_deadchild(pid, status,
1241                                               f->f_un.f_pipe.f_pname);
1242                                 break;
1243                         }
1244           oncemore:
1245                 continue;
1246         }
1247 }
1248
1249 /*
1250  * Return a printable representation of a host address.
1251  */
1252 static const char *
1253 cvthname(struct sockaddr *f)
1254 {
1255         int error, hl;
1256         sigset_t omask, nmask;
1257         static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1258
1259         error = getnameinfo((struct sockaddr *)f,
1260                             ((struct sockaddr *)f)->sa_len,
1261                             ip, sizeof ip, NULL, 0,
1262                             NI_NUMERICHOST | withscopeid);
1263         dprintf("cvthname(%s)\n", ip);
1264
1265         if (error) {
1266                 dprintf("Malformed from address %s\n", gai_strerror(error));
1267                 return ("???");
1268         }
1269         if (!resolve)
1270                 return (ip);
1271
1272         sigemptyset(&nmask);
1273         sigaddset(&nmask, SIGHUP);
1274         sigprocmask(SIG_BLOCK, &nmask, &omask);
1275         error = getnameinfo((struct sockaddr *)f,
1276                             ((struct sockaddr *)f)->sa_len,
1277                             hname, sizeof hname, NULL, 0,
1278                             NI_NAMEREQD | withscopeid);
1279         sigprocmask(SIG_SETMASK, &omask, NULL);
1280         if (error) {
1281                 dprintf("Host name for your address (%s) unknown\n", ip);
1282                 return (ip);
1283         }
1284         hl = strlen(hname);
1285         if (hl > 0 && hname[hl-1] == '.')
1286                 hname[--hl] = '\0';
1287         trimdomain(hname, hl);
1288         return (hname);
1289 }
1290
1291 static void
1292 dodie(int signo)
1293 {
1294
1295         WantDie = signo;
1296 }
1297
1298 static void
1299 domark(int signo __unused)
1300 {
1301
1302         MarkSet = 1;
1303 }
1304
1305 /*
1306  * Print syslogd errors some place.
1307  */
1308 static void
1309 logerror(const char *type)
1310 {
1311         char buf[512];
1312
1313         if (errno)
1314                 (void)snprintf(buf,
1315                     sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1316         else
1317                 (void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1318         errno = 0;
1319         dprintf("%s\n", buf);
1320         logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1321 }
1322
1323 static void
1324 die(int signo)
1325 {
1326         struct filed *f;
1327         int was_initialized;
1328         char buf[100];
1329         int i;
1330
1331         was_initialized = Initialized;
1332         Initialized = 0;        /* Don't log SIGCHLDs. */
1333         for (f = Files; f != NULL; f = f->f_next) {
1334                 /* flush any pending output */
1335                 if (f->f_prevcount)
1336                         fprintlog(f, 0, (char *)NULL);
1337                 if (f->f_type == F_PIPE)
1338                         (void)close(f->f_file);
1339         }
1340         Initialized = was_initialized;
1341         if (signo) {
1342                 dprintf("syslogd: exiting on signal %d\n", signo);
1343                 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1344                 errno = 0;
1345                 logerror(buf);
1346         }
1347         for (i = 0; i < nfunix; i++)
1348                 if (funixn[i] && funix[i] != -1)
1349                         (void)unlink(funixn[i]);
1350         exit(1);
1351 }
1352
1353 /*
1354  *  INIT -- Initialize syslogd from configuration table
1355  */
1356 static void
1357 init(int signo)
1358 {
1359         int i;
1360         FILE *cf;
1361         struct filed *f, *next, **nextp;
1362         char *p;
1363         char cline[LINE_MAX];
1364         char prog[NAME_MAX+1];
1365         char host[MAXHOSTNAMELEN];
1366         char oldLocalHostName[MAXHOSTNAMELEN];
1367         char hostMsg[2*MAXHOSTNAMELEN+40];
1368
1369         dprintf("init\n");
1370
1371         /*
1372          * Load hostname (may have changed).
1373          */
1374         if (signo != 0)
1375                 (void)strlcpy(oldLocalHostName, LocalHostName,
1376                     sizeof(oldLocalHostName));
1377         if (gethostname(LocalHostName, sizeof(LocalHostName)))
1378                 err(EX_OSERR, "gethostname() failed");
1379         if ((p = strchr(LocalHostName, '.')) != NULL) {
1380                 *p++ = '\0';
1381                 LocalDomain = p;
1382         } else {
1383                 LocalDomain = "";
1384         }
1385
1386         /*
1387          *  Close all open log files.
1388          */
1389         Initialized = 0;
1390         for (f = Files; f != NULL; f = next) {
1391                 /* flush any pending output */
1392                 if (f->f_prevcount)
1393                         fprintlog(f, 0, (char *)NULL);
1394
1395                 switch (f->f_type) {
1396                 case F_FILE:
1397                 case F_FORW:
1398                 case F_CONSOLE:
1399                 case F_TTY:
1400                         (void)close(f->f_file);
1401                         break;
1402                 case F_PIPE:
1403                         (void)close(f->f_file);
1404                         if (f->f_un.f_pipe.f_pid > 0)
1405                                 deadq_enter(f->f_un.f_pipe.f_pid,
1406                                             f->f_un.f_pipe.f_pname);
1407                         f->f_un.f_pipe.f_pid = 0;
1408                         break;
1409                 }
1410                 next = f->f_next;
1411                 if (f->f_program) free(f->f_program);
1412                 if (f->f_host) free(f->f_host);
1413                 free((char *)f);
1414         }
1415         Files = NULL;
1416         nextp = &Files;
1417
1418         /* open the configuration file */
1419         if ((cf = fopen(ConfFile, "r")) == NULL) {
1420                 dprintf("cannot open %s\n", ConfFile);
1421                 *nextp = (struct filed *)calloc(1, sizeof(*f));
1422                 if (*nextp == NULL) {
1423                         logerror("calloc");
1424                         exit(1);
1425                 }
1426                 cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1427                 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1428                 if ((*nextp)->f_next == NULL) {
1429                         logerror("calloc");
1430                         exit(1);
1431                 }
1432                 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1433                 Initialized = 1;
1434                 return;
1435         }
1436
1437         /*
1438          *  Foreach line in the conf table, open that file.
1439          */
1440         f = NULL;
1441         (void)strlcpy(host, "*", sizeof(host));
1442         (void)strlcpy(prog, "*", sizeof(prog));
1443         while (fgets(cline, sizeof(cline), cf) != NULL) {
1444                 /*
1445                  * check for end-of-section, comments, strip off trailing
1446                  * spaces and newline character. #!prog is treated specially:
1447                  * following lines apply only to that program.
1448                  */
1449                 for (p = cline; isspace(*p); ++p)
1450                         continue;
1451                 if (*p == 0)
1452                         continue;
1453                 if (*p == '#') {
1454                         p++;
1455                         if (*p != '!' && *p != '+' && *p != '-')
1456                                 continue;
1457                 }
1458                 if (*p == '+' || *p == '-') {
1459                         host[0] = *p++;
1460                         while (isspace(*p))
1461                                 p++;
1462                         if ((!*p) || (*p == '*')) {
1463                                 (void)strlcpy(host, "*", sizeof(host));
1464                                 continue;
1465                         }
1466                         if (*p == '@')
1467                                 p = LocalHostName;
1468                         for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1469                                 if (!isalnum(*p) && *p != '.' && *p != '-')
1470                                         break;
1471                                 host[i] = *p++;
1472                         }
1473                         host[i] = '\0';
1474                         continue;
1475                 }
1476                 if (*p == '!') {
1477                         p++;
1478                         while (isspace(*p)) p++;
1479                         if ((!*p) || (*p == '*')) {
1480                                 (void)strlcpy(prog, "*", sizeof(prog));
1481                                 continue;
1482                         }
1483                         for (i = 0; i < NAME_MAX; i++) {
1484                                 if (!isprint(p[i]))
1485                                         break;
1486                                 prog[i] = p[i];
1487                         }
1488                         prog[i] = 0;
1489                         continue;
1490                 }
1491                 for (p = strchr(cline, '\0'); isspace(*--p);)
1492                         continue;
1493                 *++p = '\0';
1494                 f = (struct filed *)calloc(1, sizeof(*f));
1495                 if (f == NULL) {
1496                         logerror("calloc");
1497                         exit(1);
1498                 }
1499                 *nextp = f;
1500                 nextp = &f->f_next;
1501                 cfline(cline, f, prog, host);
1502         }
1503
1504         /* close the configuration file */
1505         (void)fclose(cf);
1506
1507         Initialized = 1;
1508
1509         if (Debug) {
1510                 for (f = Files; f; f = f->f_next) {
1511                         for (i = 0; i <= LOG_NFACILITIES; i++)
1512                                 if (f->f_pmask[i] == INTERNAL_NOPRI)
1513                                         printf("X ");
1514                                 else
1515                                         printf("%d ", f->f_pmask[i]);
1516                         printf("%s: ", TypeNames[f->f_type]);
1517                         switch (f->f_type) {
1518                         case F_FILE:
1519                                 printf("%s", f->f_un.f_fname);
1520                                 break;
1521
1522                         case F_CONSOLE:
1523                         case F_TTY:
1524                                 printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1525                                 break;
1526
1527                         case F_FORW:
1528                                 printf("%s", f->f_un.f_forw.f_hname);
1529                                 break;
1530
1531                         case F_PIPE:
1532                                 printf("%s", f->f_un.f_pipe.f_pname);
1533                                 break;
1534
1535                         case F_USERS:
1536                                 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1537                                         printf("%s, ", f->f_un.f_uname[i]);
1538                                 break;
1539                         }
1540                         if (f->f_program)
1541                                 printf(" (%s)", f->f_program);
1542                         printf("\n");
1543                 }
1544         }
1545
1546         logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1547         dprintf("syslogd: restarted\n");
1548         /*
1549          * Log a change in hostname, but only on a restart.
1550          */
1551         if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1552                 (void)snprintf(hostMsg, sizeof(hostMsg),
1553                     "syslogd: hostname changed, \"%s\" to \"%s\"",
1554                     oldLocalHostName, LocalHostName);
1555                 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1556                 dprintf("%s\n", hostMsg);
1557         }
1558 }
1559
1560 /*
1561  * Crack a configuration file line
1562  */
1563 static void
1564 cfline(const char *line, struct filed *f, const char *prog, const char *host)
1565 {
1566         struct addrinfo hints, *res;
1567         int error, i, pri;
1568         const char *p, *q;
1569         char *bp;
1570         char buf[MAXLINE], ebuf[100];
1571
1572         dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1573
1574         errno = 0;      /* keep strerror() stuff out of logerror messages */
1575
1576         /* clear out file entry */
1577         memset(f, 0, sizeof(*f));
1578         for (i = 0; i <= LOG_NFACILITIES; i++)
1579                 f->f_pmask[i] = INTERNAL_NOPRI;
1580
1581         /* save hostname if any */
1582         if (host && *host == '*')
1583                 host = NULL;
1584         if (host) {
1585                 int hl;
1586
1587                 f->f_host = strdup(host);
1588                 if (f->f_host == NULL) {
1589                         logerror("strdup");
1590                         exit(1);
1591                 }
1592                 hl = strlen(f->f_host);
1593                 if (hl > 0 && f->f_host[hl-1] == '.')
1594                         f->f_host[--hl] = '\0';
1595                 trimdomain(f->f_host, hl);
1596         }
1597
1598         /* save program name if any */
1599         if (prog && *prog == '*')
1600                 prog = NULL;
1601         if (prog) {
1602                 f->f_program = strdup(prog);
1603                 if (f->f_program == NULL) {
1604                         logerror("strdup");
1605                         exit(1);
1606                 }
1607         }
1608
1609         /* scan through the list of selectors */
1610         for (p = line; *p && *p != '\t' && *p != ' ';) {
1611                 int pri_done;
1612                 int pri_cmp;
1613                 int pri_invert;
1614
1615                 /* find the end of this facility name list */
1616                 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1617                         continue;
1618
1619                 /* get the priority comparison */
1620                 pri_cmp = 0;
1621                 pri_done = 0;
1622                 pri_invert = 0;
1623                 if (*q == '!') {
1624                         pri_invert = 1;
1625                         q++;
1626                 }
1627                 while (!pri_done) {
1628                         switch (*q) {
1629                         case '<':
1630                                 pri_cmp |= PRI_LT;
1631                                 q++;
1632                                 break;
1633                         case '=':
1634                                 pri_cmp |= PRI_EQ;
1635                                 q++;
1636                                 break;
1637                         case '>':
1638                                 pri_cmp |= PRI_GT;
1639                                 q++;
1640                                 break;
1641                         default:
1642                                 pri_done++;
1643                                 break;
1644                         }
1645                 }
1646
1647                 /* collect priority name */
1648                 for (bp = buf; *q && !strchr("\t,; ", *q); )
1649                         *bp++ = *q++;
1650                 *bp = '\0';
1651
1652                 /* skip cruft */
1653                 while (strchr(",;", *q))
1654                         q++;
1655
1656                 /* decode priority name */
1657                 if (*buf == '*') {
1658                         pri = LOG_PRIMASK + 1;
1659                         pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1660                 } else {
1661                         pri = decode(buf, prioritynames);
1662                         if (pri < 0) {
1663                                 (void)snprintf(ebuf, sizeof ebuf,
1664                                     "unknown priority name \"%s\"", buf);
1665                                 logerror(ebuf);
1666                                 return;
1667                         }
1668                 }
1669                 if (!pri_cmp)
1670                         pri_cmp = (UniquePriority)
1671                                   ? (PRI_EQ)
1672                                   : (PRI_EQ | PRI_GT)
1673                                   ;
1674                 if (pri_invert)
1675                         pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1676
1677                 /* scan facilities */
1678                 while (*p && !strchr("\t.; ", *p)) {
1679                         for (bp = buf; *p && !strchr("\t,;. ", *p); )
1680                                 *bp++ = *p++;
1681                         *bp = '\0';
1682
1683                         if (*buf == '*') {
1684                                 for (i = 0; i < LOG_NFACILITIES; i++) {
1685                                         f->f_pmask[i] = pri;
1686                                         f->f_pcmp[i] = pri_cmp;
1687                                 }
1688                         } else {
1689                                 i = decode(buf, facilitynames);
1690                                 if (i < 0) {
1691                                         (void)snprintf(ebuf, sizeof ebuf,
1692                                             "unknown facility name \"%s\"",
1693                                             buf);
1694                                         logerror(ebuf);
1695                                         return;
1696                                 }
1697                                 f->f_pmask[i >> 3] = pri;
1698                                 f->f_pcmp[i >> 3] = pri_cmp;
1699                         }
1700                         while (*p == ',' || *p == ' ')
1701                                 p++;
1702                 }
1703
1704                 p = q;
1705         }
1706
1707         /* skip to action part */
1708         while (*p == '\t' || *p == ' ')
1709                 p++;
1710
1711         switch (*p) {
1712         case '@':
1713                 (void)strlcpy(f->f_un.f_forw.f_hname, ++p,
1714                         sizeof(f->f_un.f_forw.f_hname));
1715                 memset(&hints, 0, sizeof(hints));
1716                 hints.ai_family = family;
1717                 hints.ai_socktype = SOCK_DGRAM;
1718                 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints,
1719                                     &res);
1720                 if (error) {
1721                         logerror(gai_strerror(error));
1722                         break;
1723                 }
1724                 f->f_un.f_forw.f_addr = res;
1725                 f->f_type = F_FORW;
1726                 break;
1727
1728         case '/':
1729                 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) {
1730                         f->f_type = F_UNUSED;
1731                         logerror(p);
1732                         break;
1733                 }
1734                 if (isatty(f->f_file)) {
1735                         if (strcmp(p, ctty) == 0)
1736                                 f->f_type = F_CONSOLE;
1737                         else
1738                                 f->f_type = F_TTY;
1739                         (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
1740                             sizeof(f->f_un.f_fname));
1741                 } else {
1742                         (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
1743                         f->f_type = F_FILE;
1744                 }
1745                 break;
1746
1747         case '|':
1748                 f->f_un.f_pipe.f_pid = 0;
1749                 (void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname));
1750                 f->f_type = F_PIPE;
1751                 break;
1752
1753         case '*':
1754                 f->f_type = F_WALL;
1755                 break;
1756
1757         default:
1758                 for (i = 0; i < MAXUNAMES && *p; i++) {
1759                         for (q = p; *q && *q != ','; )
1760                                 q++;
1761                         (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
1762                         if ((q - p) > UT_NAMESIZE)
1763                                 f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
1764                         else
1765                                 f->f_un.f_uname[i][q - p] = '\0';
1766                         while (*q == ',' || *q == ' ')
1767                                 q++;
1768                         p = q;
1769                 }
1770                 f->f_type = F_USERS;
1771                 break;
1772         }
1773 }
1774
1775
1776 /*
1777  *  Decode a symbolic name to a numeric value
1778  */
1779 static int
1780 decode(const char *name, CODE *codetab)
1781 {
1782         CODE *c;
1783         char *p, buf[40];
1784
1785         if (isdigit(*name))
1786                 return (atoi(name));
1787
1788         for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
1789                 if (isupper(*name))
1790                         *p = tolower(*name);
1791                 else
1792                         *p = *name;
1793         }
1794         *p = '\0';
1795         for (c = codetab; c->c_name; c++)
1796                 if (!strcmp(buf, c->c_name))
1797                         return (c->c_val);
1798
1799         return (-1);
1800 }
1801
1802 static void
1803 markit(void)
1804 {
1805         struct filed *f;
1806         dq_t q, next;
1807
1808         now = time((time_t *)NULL);
1809         MarkSeq += TIMERINTVL;
1810         if (MarkSeq >= MarkInterval) {
1811                 logmsg(LOG_INFO, "-- MARK --",
1812                     LocalHostName, ADDDATE|MARK);
1813                 MarkSeq = 0;
1814         }
1815
1816         for (f = Files; f; f = f->f_next) {
1817                 if (f->f_prevcount && now >= REPEATTIME(f)) {
1818                         dprintf("flush %s: repeated %d times, %d sec.\n",
1819                             TypeNames[f->f_type], f->f_prevcount,
1820                             repeatinterval[f->f_repeatcount]);
1821                         fprintlog(f, 0, (char *)NULL);
1822                         BACKOFF(f);
1823                 }
1824         }
1825
1826         /* Walk the dead queue, and see if we should signal somebody. */
1827         for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
1828                 next = TAILQ_NEXT(q, dq_entries);
1829
1830                 switch (q->dq_timeout) {
1831                 case 0:
1832                         /* Already signalled once, try harder now. */
1833                         if (kill(q->dq_pid, SIGKILL) != 0)
1834                                 (void)deadq_remove(q->dq_pid);
1835                         break;
1836
1837                 case 1:
1838                         /*
1839                          * Timed out on dead queue, send terminate
1840                          * signal.  Note that we leave the removal
1841                          * from the dead queue to reapchild(), which
1842                          * will also log the event (unless the process
1843                          * didn't even really exist, in case we simply
1844                          * drop it from the dead queue).
1845                          */
1846                         if (kill(q->dq_pid, SIGTERM) != 0)
1847                                 (void)deadq_remove(q->dq_pid);
1848                         /* FALLTHROUGH */
1849
1850                 default:
1851                         q->dq_timeout--;
1852                 }
1853         }
1854         MarkSet = 0;
1855         (void)alarm(TIMERINTVL);
1856 }
1857
1858 /*
1859  * fork off and become a daemon, but wait for the child to come online
1860  * before returing to the parent, or we get disk thrashing at boot etc.
1861  * Set a timer so we don't hang forever if it wedges.
1862  */
1863 static int
1864 waitdaemon(int nochdir, int noclose, int maxwait)
1865 {
1866         int fd;
1867         int status;
1868         pid_t pid, childpid;
1869
1870         switch (childpid = fork()) {
1871         case -1:
1872                 return (-1);
1873         case 0:
1874                 break;
1875         default:
1876                 signal(SIGALRM, timedout);
1877                 alarm(maxwait);
1878                 while ((pid = wait3(&status, 0, NULL)) != -1) {
1879                         if (WIFEXITED(status))
1880                                 errx(1, "child pid %d exited with return code %d",
1881                                         pid, WEXITSTATUS(status));
1882                         if (WIFSIGNALED(status))
1883                                 errx(1, "child pid %d exited on signal %d%s",
1884                                         pid, WTERMSIG(status),
1885                                         WCOREDUMP(status) ? " (core dumped)" :
1886                                         "");
1887                         if (pid == childpid)    /* it's gone... */
1888                                 break;
1889                 }
1890                 exit(0);
1891         }
1892
1893         if (setsid() == -1)
1894                 return (-1);
1895
1896         if (!nochdir)
1897                 (void)chdir("/");
1898
1899         if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1900                 (void)dup2(fd, STDIN_FILENO);
1901                 (void)dup2(fd, STDOUT_FILENO);
1902                 (void)dup2(fd, STDERR_FILENO);
1903                 if (fd > 2)
1904                         (void)close (fd);
1905         }
1906         return (getppid());
1907 }
1908
1909 /*
1910  * We get a SIGALRM from the child when it's running and finished doing it's
1911  * fsync()'s or O_SYNC writes for all the boot messages.
1912  *
1913  * We also get a signal from the kernel if the timer expires, so check to
1914  * see what happened.
1915  */
1916 static void
1917 timedout(int sig __unused)
1918 {
1919         int left;
1920         left = alarm(0);
1921         signal(SIGALRM, SIG_DFL);
1922         if (left == 0)
1923                 errx(1, "timed out waiting for child");
1924         else
1925                 _exit(0);
1926 }
1927
1928 /*
1929  * Add `s' to the list of allowable peer addresses to accept messages
1930  * from.
1931  *
1932  * `s' is a string in the form:
1933  *
1934  *    [*]domainname[:{servicename|portnumber|*}]
1935  *
1936  * or
1937  *
1938  *    netaddr/maskbits[:{servicename|portnumber|*}]
1939  *
1940  * Returns -1 on error, 0 if the argument was valid.
1941  */
1942 static int
1943 allowaddr(char *s)
1944 {
1945         char *cp1, *cp2;
1946         struct allowedpeer ap;
1947         struct servent *se;
1948         int masklen = -1, i;
1949         struct addrinfo hints, *res;
1950         struct in_addr *addrp, *maskp;
1951         u_int32_t *addr6p, *mask6p;
1952         char ip[NI_MAXHOST];
1953
1954 #ifdef INET6
1955         if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
1956 #endif
1957                 cp1 = s;
1958         if ((cp1 = strrchr(cp1, ':'))) {
1959                 /* service/port provided */
1960                 *cp1++ = '\0';
1961                 if (strlen(cp1) == 1 && *cp1 == '*')
1962                         /* any port allowed */
1963                         ap.port = 0;
1964                 else if ((se = getservbyname(cp1, "udp"))) {
1965                         ap.port = ntohs(se->s_port);
1966                 } else {
1967                         ap.port = strtol(cp1, &cp2, 0);
1968                         if (*cp2 != '\0')
1969                                 return (-1); /* port not numeric */
1970                 }
1971         } else {
1972                 if ((se = getservbyname("syslog", "udp")))
1973                         ap.port = ntohs(se->s_port);
1974                 else
1975                         /* sanity, should not happen */
1976                         ap.port = 514;
1977         }
1978
1979         if ((cp1 = strchr(s, '/')) != NULL &&
1980             strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
1981                 *cp1 = '\0';
1982                 if ((masklen = atoi(cp1 + 1)) < 0)
1983                         return (-1);
1984         }
1985 #ifdef INET6
1986         if (*s == '[') {
1987                 cp2 = s + strlen(s) - 1;
1988                 if (*cp2 == ']') {
1989                         ++s;
1990                         *cp2 = '\0';
1991                 } else {
1992                         cp2 = NULL;
1993                 }
1994         } else {
1995                 cp2 = NULL;
1996         }
1997 #endif
1998         memset(&hints, 0, sizeof(hints));
1999         hints.ai_family = PF_UNSPEC;
2000         hints.ai_socktype = SOCK_DGRAM;
2001         hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2002         if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2003                 ap.isnumeric = 1;
2004                 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2005                 memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2006                 ap.a_mask.ss_family = res->ai_family;
2007                 if (res->ai_family == AF_INET) {
2008                         ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2009                         maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2010                         addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2011                         if (masklen < 0) {
2012                                 /* use default netmask */
2013                                 if (IN_CLASSA(ntohl(addrp->s_addr)))
2014                                         maskp->s_addr = htonl(IN_CLASSA_NET);
2015                                 else if (IN_CLASSB(ntohl(addrp->s_addr)))
2016                                         maskp->s_addr = htonl(IN_CLASSB_NET);
2017                                 else
2018                                         maskp->s_addr = htonl(IN_CLASSC_NET);
2019                         } else if (masklen <= 32) {
2020                                 /* convert masklen to netmask */
2021                                 if (masklen == 0)
2022                                         maskp->s_addr = 0;
2023                                 else
2024                                         maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2025                         } else {
2026                                 freeaddrinfo(res);
2027                                 return (-1);
2028                         }
2029                         /* Lose any host bits in the network number. */
2030                         addrp->s_addr &= maskp->s_addr;
2031                 }
2032 #ifdef INET6
2033                 else if (res->ai_family == AF_INET6 && masklen <= 128) {
2034                         ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2035                         if (masklen < 0)
2036                                 masklen = 128;
2037                         mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2038                         /* convert masklen to netmask */
2039                         while (masklen > 0) {
2040                                 if (masklen < 32) {
2041                                         *mask6p = htonl(~(0xffffffff >> masklen));
2042                                         break;
2043                                 }
2044                                 *mask6p++ = 0xffffffff;
2045                                 masklen -= 32;
2046                         }
2047                         /* Lose any host bits in the network number. */
2048                         mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2049                         addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2050                         for (i = 0; i < 4; i++)
2051                                 addr6p[i] &= mask6p[i];
2052                 }
2053 #endif
2054                 else {
2055                         freeaddrinfo(res);
2056                         return (-1);
2057                 }
2058                 freeaddrinfo(res);
2059         } else {
2060                 /* arg `s' is domain name */
2061                 ap.isnumeric = 0;
2062                 ap.a_name = s;
2063                 if (cp1)
2064                         *cp1 = '/';
2065 #ifdef INET6
2066                 if (cp2) {
2067                         *cp2 = ']';
2068                         --s;
2069                 }
2070 #endif
2071         }
2072
2073         if (Debug) {
2074                 printf("allowaddr: rule %d: ", NumAllowed);
2075                 if (ap.isnumeric) {
2076                         printf("numeric, ");
2077                         getnameinfo((struct sockaddr *)&ap.a_addr,
2078                                     ((struct sockaddr *)&ap.a_addr)->sa_len,
2079                                     ip, sizeof ip, NULL, 0,
2080                                     NI_NUMERICHOST | withscopeid);
2081                         printf("addr = %s, ", ip);
2082                         getnameinfo((struct sockaddr *)&ap.a_mask,
2083                                     ((struct sockaddr *)&ap.a_mask)->sa_len,
2084                                     ip, sizeof ip, NULL, 0,
2085                                     NI_NUMERICHOST | withscopeid);
2086                         printf("mask = %s; ", ip);
2087                 } else {
2088                         printf("domainname = %s; ", ap.a_name);
2089                 }
2090                 printf("port = %d\n", ap.port);
2091         }
2092
2093         if ((AllowedPeers = realloc(AllowedPeers,
2094                                     ++NumAllowed * sizeof(struct allowedpeer)))
2095             == NULL) {
2096                 logerror("realloc");
2097                 exit(1);
2098         }
2099         memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2100         return (0);
2101 }
2102
2103 /*
2104  * Validate that the remote peer has permission to log to us.
2105  */
2106 static int
2107 validate(struct sockaddr *sa, const char *hname)
2108 {
2109         int i, j, reject;
2110         size_t l1, l2;
2111         char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2112         struct allowedpeer *ap;
2113         struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2114         struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2115         struct addrinfo hints, *res;
2116         u_short sport;
2117
2118         if (NumAllowed == 0)
2119                 /* traditional behaviour, allow everything */
2120                 return (1);
2121
2122         (void)strlcpy(name, hname, sizeof(name));
2123         memset(&hints, 0, sizeof(hints));
2124         hints.ai_family = PF_UNSPEC;
2125         hints.ai_socktype = SOCK_DGRAM;
2126         hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2127         if (getaddrinfo(name, NULL, &hints, &res) == 0)
2128                 freeaddrinfo(res);
2129         else if (strchr(name, '.') == NULL) {
2130                 strlcat(name, ".", sizeof name);
2131                 strlcat(name, LocalDomain, sizeof name);
2132         }
2133         if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2134                         NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0)
2135                 return (0);     /* for safety, should not occur */
2136         dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2137                 ip, port, name);
2138         sport = atoi(port);
2139
2140         /* now, walk down the list */
2141         for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2142                 if (ap->port != 0 && ap->port != sport) {
2143                         dprintf("rejected in rule %d due to port mismatch.\n", i);
2144                         continue;
2145                 }
2146
2147                 if (ap->isnumeric) {
2148                         if (ap->a_addr.ss_family != sa->sa_family) {
2149                                 dprintf("rejected in rule %d due to address family mismatch.\n", i);
2150                                 continue;
2151                         }
2152                         if (ap->a_addr.ss_family == AF_INET) {
2153                                 sin4 = (struct sockaddr_in *)sa;
2154                                 a4p = (struct sockaddr_in *)&ap->a_addr;
2155                                 m4p = (struct sockaddr_in *)&ap->a_mask;
2156                                 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2157                                     != a4p->sin_addr.s_addr) {
2158                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
2159                                         continue;
2160                                 }
2161                         }
2162 #ifdef INET6
2163                         else if (ap->a_addr.ss_family == AF_INET6) {
2164                                 sin6 = (struct sockaddr_in6 *)sa;
2165                                 a6p = (struct sockaddr_in6 *)&ap->a_addr;
2166                                 m6p = (struct sockaddr_in6 *)&ap->a_mask;
2167 #ifdef NI_WITHSCOPEID
2168                                 if (a6p->sin6_scope_id != 0 &&
2169                                     sin6->sin6_scope_id != a6p->sin6_scope_id) {
2170                                         dprintf("rejected in rule %d due to scope mismatch.\n", i);
2171                                         continue;
2172                                 }
2173 #endif
2174                                 reject = 0;
2175                                 for (j = 0; j < 16; j += 4) {
2176                                         if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2177                                             != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2178                                                 ++reject;
2179                                                 break;
2180                                         }
2181                                 }
2182                                 if (reject) {
2183                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
2184                                         continue;
2185                                 }
2186                         }
2187 #endif
2188                         else
2189                                 continue;
2190                 } else {
2191                         cp = ap->a_name;
2192                         l1 = strlen(name);
2193                         if (*cp == '*') {
2194                                 /* allow wildmatch */
2195                                 cp++;
2196                                 l2 = strlen(cp);
2197                                 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2198                                         dprintf("rejected in rule %d due to name mismatch.\n", i);
2199                                         continue;
2200                                 }
2201                         } else {
2202                                 /* exact match */
2203                                 l2 = strlen(cp);
2204                                 if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2205                                         dprintf("rejected in rule %d due to name mismatch.\n", i);
2206                                         continue;
2207                                 }
2208                         }
2209                 }
2210                 dprintf("accepted in rule %d.\n", i);
2211                 return (1);     /* hooray! */
2212         }
2213         return (0);
2214 }
2215
2216 /*
2217  * Fairly similar to popen(3), but returns an open descriptor, as
2218  * opposed to a FILE *.
2219  */
2220 static int
2221 p_open(const char *prog, pid_t *pid)
2222 {
2223         int pfd[2], nulldesc, i;
2224         sigset_t omask, mask;
2225         char *argv[4]; /* sh -c cmd NULL */
2226         char errmsg[200];
2227
2228         if (pipe(pfd) == -1)
2229                 return (-1);
2230         if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2231                 /* we are royally screwed anyway */
2232                 return (-1);
2233
2234         sigemptyset(&mask);
2235         sigaddset(&mask, SIGALRM);
2236         sigaddset(&mask, SIGHUP);
2237         sigprocmask(SIG_BLOCK, &mask, &omask);
2238         switch ((*pid = fork())) {
2239         case -1:
2240                 sigprocmask(SIG_SETMASK, &omask, 0);
2241                 close(nulldesc);
2242                 return (-1);
2243
2244         case 0:
2245                 argv[0] = strdup("sh");
2246                 argv[1] = strdup("-c");
2247                 argv[2] = strdup(prog);
2248                 argv[3] = NULL;
2249                 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2250                         logerror("strdup");
2251                         exit(1);
2252                 }
2253
2254                 alarm(0);
2255                 (void)setsid(); /* Avoid catching SIGHUPs. */
2256
2257                 /*
2258                  * Throw away pending signals, and reset signal
2259                  * behaviour to standard values.
2260                  */
2261                 signal(SIGALRM, SIG_IGN);
2262                 signal(SIGHUP, SIG_IGN);
2263                 sigprocmask(SIG_SETMASK, &omask, 0);
2264                 signal(SIGPIPE, SIG_DFL);
2265                 signal(SIGQUIT, SIG_DFL);
2266                 signal(SIGALRM, SIG_DFL);
2267                 signal(SIGHUP, SIG_DFL);
2268
2269                 dup2(pfd[0], STDIN_FILENO);
2270                 dup2(nulldesc, STDOUT_FILENO);
2271                 dup2(nulldesc, STDERR_FILENO);
2272                 for (i = getdtablesize(); i > 2; i--)
2273                         (void)close(i);
2274
2275                 (void)execvp(_PATH_BSHELL, argv);
2276                 _exit(255);
2277         }
2278
2279         sigprocmask(SIG_SETMASK, &omask, 0);
2280         close(nulldesc);
2281         close(pfd[0]);
2282         /*
2283          * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
2284          * supposed to get an EWOULDBLOCK on writev(2), which is
2285          * caught by the logic above anyway, which will in turn close
2286          * the pipe, and fork a new logging subprocess if necessary.
2287          * The stale subprocess will be killed some time later unless
2288          * it terminated itself due to closing its input pipe (so we
2289          * get rid of really dead puppies).
2290          */
2291         if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2292                 /* This is bad. */
2293                 (void)snprintf(errmsg, sizeof errmsg,
2294                                "Warning: cannot change pipe to PID %d to "
2295                                "non-blocking behaviour.",
2296                                (int)*pid);
2297                 logerror(errmsg);
2298         }
2299         return (pfd[1]);
2300 }
2301
2302 static void
2303 deadq_enter(pid_t pid, const char *name)
2304 {
2305         dq_t p;
2306         int status;
2307
2308         /*
2309          * Be paranoid, if we can't signal the process, don't enter it
2310          * into the dead queue (perhaps it's already dead).  If possible,
2311          * we try to fetch and log the child's status.
2312          */
2313         if (kill(pid, 0) != 0) {
2314                 if (waitpid(pid, &status, WNOHANG) > 0)
2315                         log_deadchild(pid, status, name);
2316                 return;
2317         }
2318
2319         p = malloc(sizeof(struct deadq_entry));
2320         if (p == NULL) {
2321                 logerror("malloc");
2322                 exit(1);
2323         }
2324
2325         p->dq_pid = pid;
2326         p->dq_timeout = DQ_TIMO_INIT;
2327         TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2328 }
2329
2330 static int
2331 deadq_remove(pid_t pid)
2332 {
2333         dq_t q;
2334
2335         TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2336                 if (q->dq_pid == pid) {
2337                         TAILQ_REMOVE(&deadq_head, q, dq_entries);
2338                                 free(q);
2339                                 return (1);
2340                 }
2341         }
2342
2343         return (0);
2344 }
2345
2346 static void
2347 log_deadchild(pid_t pid, int status, const char *name)
2348 {
2349         int code;
2350         char buf[256];
2351         const char *reason;
2352
2353         errno = 0; /* Keep strerror() stuff out of logerror messages. */
2354         if (WIFSIGNALED(status)) {
2355                 reason = "due to signal";
2356                 code = WTERMSIG(status);
2357         } else {
2358                 reason = "with status";
2359                 code = WEXITSTATUS(status);
2360                 if (code == 0)
2361                         return;
2362         }
2363         (void)snprintf(buf, sizeof buf,
2364                        "Logging subprocess %d (%s) exited %s %d.",
2365                        pid, name, reason, code);
2366         logerror(buf);
2367 }
2368
2369 static int *
2370 socksetup(int af, const char *bindhostname)
2371 {
2372         struct addrinfo hints, *res, *r;
2373         int error, maxs, *s, *socks;
2374
2375         memset(&hints, 0, sizeof(hints));
2376         hints.ai_flags = AI_PASSIVE;
2377         hints.ai_family = af;
2378         hints.ai_socktype = SOCK_DGRAM;
2379         error = getaddrinfo(bindhostname, "syslog", &hints, &res);
2380         if (error) {
2381                 logerror(gai_strerror(error));
2382                 errno = 0;
2383                 die(0);
2384         }
2385
2386         /* Count max number of sockets we may open */
2387         for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2388         socks = malloc((maxs+1) * sizeof(int));
2389         if (socks == NULL) {
2390                 logerror("couldn't allocate memory for sockets");
2391                 die(0);
2392         }
2393
2394         *socks = 0;   /* num of sockets counter at start of array */
2395         s = socks + 1;
2396         for (r = res; r; r = r->ai_next) {
2397                 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2398                 if (*s < 0) {
2399                         logerror("socket");
2400                         continue;
2401                 }
2402                 if (r->ai_family == AF_INET6) {
2403                         int on = 1;
2404                         if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2405                                        (char *)&on, sizeof (on)) < 0) {
2406                                 logerror("setsockopt");
2407                                 close(*s);
2408                                 continue;
2409                         }
2410                 }
2411                 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2412                         close(*s);
2413                         logerror("bind");
2414                         continue;
2415                 }
2416
2417                 (*socks)++;
2418                 s++;
2419         }
2420
2421         if (*socks == 0) {
2422                 free(socks);
2423                 if (Debug)
2424                         return (NULL);
2425                 else
2426                         die(0);
2427         }
2428         if (res)
2429                 freeaddrinfo(res);
2430
2431         return (socks);
2432 }