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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)syslogd.c   8.3 (Berkeley) 4/4/94";
  39 #endif
  40 #endif /* not lint */
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 /*
  46  *  syslogd -- log system messages
  47  *
  48  * This program implements a system log. It takes a series of lines.
  49  * Each line may have a priority, signified as "<n>" as
  50  * the first characters of the line.  If this is
  51  * not present, a default priority is used.
  52  *
  53  * To kill syslogd, send a signal 15 (terminate).  A signal 1 (hup) will
  54  * cause it to reread its configuration file.
  55  *
  56  * Defined Constants:
  57  *
  58  * MAXLINE -- the maximum line length that can be handled.
  59  * DEFUPRI -- the default priority for user messages
  60  * DEFSPRI -- the default priority for kernel messages
  61  *
  62  * Author: Eric Allman
  63  * extensive changes by Ralph Campbell
  64  * more extensive changes by Eric Allman (again)
  65  * Extension to log by program name as well as facility and priority
  66  *   by Peter da Silva.
  67  * -u and -v by Harlan Stenn.
  68  * Priority comparison code by Harlan Stenn.
  69  */
  70
  71 /* Maximum number of characters in time of last occurrence */
  72 #define MAXDATELEN      16
  73 #define MAXLINE         1024            /* maximum line length */
  74 #define MAXSVLINE       MAXLINE         /* maximum saved line length */
  75 #define DEFUPRI         (LOG_USER|LOG_NOTICE)
  76 #define DEFSPRI         (LOG_KERN|LOG_CRIT)
  77 #define TIMERINTVL      30              /* interval for checking flush, mark */
  78 #define TTYMSGTIME      1               /* timeout passed to ttymsg */
  79 #define RCVBUF_MINSIZE  (80 * 1024)     /* minimum size of dgram rcv buffer */
  80
  81 #include <sys/param.h>
  82 #include <sys/ioctl.h>
  83 #include <sys/mman.h>
  84 #include <sys/queue.h>
  85 #include <sys/resource.h>
  86 #include <sys/socket.h>
  87 #include <sys/stat.h>
  88 #include <sys/syslimits.h>
  89 #include <sys/time.h>
  90 #include <sys/uio.h>
  91 #include <sys/un.h>
  92 #include <sys/wait.h>
  93 #include <sys/types.h>
  94
  95 #include <netinet/in.h>
  96 #include <netdb.h>
  97 #include <arpa/inet.h>
  98
  99 #include <ctype.h>
 100 #include <dirent.h>
 101 #include <err.h>
 102 #include <errno.h>
 103 #include <fcntl.h>
 104 #include <libutil.h>
 105 #include <limits.h>
 106 #include <paths.h>
 107 #include <signal.h>
 108 #include <stdio.h>
 109 #include <stdlib.h>
 110 #include <string.h>
 111 #include <sysexits.h>
 112 #include <unistd.h>
 113 #include <utmpx.h>
 114
 115 #include "pathnames.h"
 116 #include "ttymsg.h"
 117
 118 #define SYSLOG_NAMES
 119 #include <sys/syslog.h>
 120
 121 const char      *ConfFile = _PATH_LOGCONF;
 122 const char      *PidFile = _PATH_LOGPID;
 123 const char      ctty[] = _PATH_CONSOLE;
 124 static const char       include_str[] = "include";
 125 static const char       include_ext[] = ".conf";
 126
 127 #define dprintf         if (Debug) printf
 128
 129 #define MAXUNAMES       20      /* maximum number of user names */
 130
 131 /*
 132  * Unix sockets.
 133  * We have two default sockets, one with 666 permissions,
 134  * and one for privileged programs.
 135  */
 136 struct funix {
 137         int                     s;
 138         const char              *name;
 139         mode_t                  mode;
 140         STAILQ_ENTRY(funix)     next;
 141 };
 142 struct funix funix_secure =     { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
 143                                 { NULL } };
 144 struct funix funix_default =    { -1, _PATH_LOG, DEFFILEMODE,
 145                                 { &funix_secure } };
 146
 147 STAILQ_HEAD(, funix) funixes =  { &funix_default,
 148                                 &(funix_secure.next.stqe_next) };
 149
 150 /*
 151  * Flags to logmsg().
 152  */
 153
 154 #define IGN_CONS        0x001   /* don't print on console */
 155 #define SYNC_FILE       0x002   /* do fsync on file after printing */
 156 #define ADDDATE         0x004   /* add a date to the message */
 157 #define MARK            0x008   /* this message is a mark */
 158 #define ISKERNEL        0x010   /* kernel generated message */
 159
 160 /*
 161  * This structure represents the files that will have log
 162  * copies printed.
 163  * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
 164  * or if f_type is F_PIPE and f_pid > 0.
 165  */
 166
 167 struct filed {
 168         struct  filed *f_next;          /* next in linked list */
 169         short   f_type;                 /* entry type, see below */
 170         short   f_file;                 /* file descriptor */
 171         time_t  f_time;                 /* time this was last written */
 172         char    *f_host;                /* host from which to recd. */
 173         u_char  f_pmask[LOG_NFACILITIES+1];     /* priority mask */
 174         u_char  f_pcmp[LOG_NFACILITIES+1];      /* compare priority */
 175 #define PRI_LT  0x1
 176 #define PRI_EQ  0x2
 177 #define PRI_GT  0x4
 178         char    *f_program;             /* program this applies to */
 179         union {
 180                 char    f_uname[MAXUNAMES][MAXLOGNAME];
 181                 struct {
 182                         char    f_hname[MAXHOSTNAMELEN];
 183                         struct addrinfo *f_addr;
 184
 185                 } f_forw;               /* forwarding address */
 186                 char    f_fname[MAXPATHLEN];
 187                 struct {
 188                         char    f_pname[MAXPATHLEN];
 189                         pid_t   f_pid;
 190                 } f_pipe;
 191         } f_un;
 192         char    f_prevline[MAXSVLINE];          /* last message logged */
 193         char    f_lasttime[MAXDATELEN];         /* time of last occurrence */
 194         char    f_prevhost[MAXHOSTNAMELEN];     /* host from which recd. */
 195         int     f_prevpri;                      /* pri of f_prevline */
 196         int     f_prevlen;                      /* length of f_prevline */
 197         int     f_prevcount;                    /* repetition cnt of prevline */
 198         u_int   f_repeatcount;                  /* number of "repeated" msgs */
 199         int     f_flags;                        /* file-specific flags */
 200 #define FFLAG_SYNC 0x01
 201 #define FFLAG_NEEDSYNC  0x02
 202 };
 203
 204 /*
 205  * Queue of about-to-be dead processes we should watch out for.
 206  */
 207
 208 TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
 209 struct stailhead *deadq_headp;
 210
 211 struct deadq_entry {
 212         pid_t                           dq_pid;
 213         int                             dq_timeout;
 214         TAILQ_ENTRY(deadq_entry)        dq_entries;
 215 };
 216
 217 /*
 218  * The timeout to apply to processes waiting on the dead queue.  Unit
 219  * of measure is `mark intervals', i.e. 20 minutes by default.
 220  * Processes on the dead queue will be terminated after that time.
 221  */
 222
 223 #define  DQ_TIMO_INIT   2
 224
 225 typedef struct deadq_entry *dq_t;
 226
 227
 228 /*
 229  * Struct to hold records of network addresses that are allowed to log
 230  * to us.
 231  */
 232 struct allowedpeer {
 233         int isnumeric;
 234         u_short port;
 235         union {
 236                 struct {
 237                         struct sockaddr_storage addr;
 238                         struct sockaddr_storage mask;
 239                 } numeric;
 240                 char *name;
 241         } u;
 242 #define a_addr u.numeric.addr
 243 #define a_mask u.numeric.mask
 244 #define a_name u.name
 245 };
 246
 247
 248 /*
 249  * Intervals at which we flush out "message repeated" messages,
 250  * in seconds after previous message is logged.  After each flush,
 251  * we move to the next interval until we reach the largest.
 252  */
 253 int     repeatinterval[] = { 30, 120, 600 };    /* # of secs before flush */
 254 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
 255 #define REPEATTIME(f)   ((f)->f_time + repeatinterval[(f)->f_repeatcount])
 256 #define BACKOFF(f)      { if (++(f)->f_repeatcount > MAXREPEAT) \
 257                                  (f)->f_repeatcount = MAXREPEAT; \
 258                         }
 259
 260 /* values for f_type */
 261 #define F_UNUSED        0               /* unused entry */
 262 #define F_FILE          1               /* regular file */
 263 #define F_TTY           2               /* terminal */
 264 #define F_CONSOLE       3               /* console terminal */
 265 #define F_FORW          4               /* remote machine */
 266 #define F_USERS         5               /* list of users */
 267 #define F_WALL          6               /* everyone logged on */
 268 #define F_PIPE          7               /* pipe to program */
 269
 270 const char *TypeNames[8] = {
 271         "UNUSED",       "FILE",         "TTY",          "CONSOLE",
 272         "FORW",         "USERS",        "WALL",         "PIPE"
 273 };
 274
 275 static struct filed *Files;     /* Log files that we write to */
 276 static struct filed consfile;   /* Console */
 277
 278 static int      Debug;          /* debug flag */
 279 static int      Foreground = 0; /* Run in foreground, instead of daemonizing */
 280 static int      resolve = 1;    /* resolve hostname */
 281 static char     LocalHostName[MAXHOSTNAMELEN];  /* our hostname */
 282 static const char *LocalDomain; /* our local domain name */
 283 static int      *finet;         /* Internet datagram socket */
 284 static int      fklog = -1;     /* /dev/klog */
 285 static int      Initialized;    /* set when we have initialized ourselves */
 286 static int      MarkInterval = 20 * 60; /* interval between marks in seconds */
 287 static int      MarkSeq;        /* mark sequence number */
 288 static int      NoBind;         /* don't bind() as suggested by RFC 3164 */
 289 static int      SecureMode;     /* when true, receive only unix domain socks */
 290 #ifdef INET6
 291 static int      family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
 292 #else
 293 static int      family = PF_INET; /* protocol family (IPv4 only) */
 294 #endif
 295 static int      mask_C1 = 1;    /* mask characters from 0x80 - 0x9F */
 296 static int      send_to_all;    /* send message to all IPv4/IPv6 addresses */
 297 static int      use_bootfile;   /* log entire bootfile for every kern msg */
 298 static int      no_compress;    /* don't compress messages (1=pipes, 2=all) */
 299 static int      logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
 300
 301 static char     bootfile[MAXLINE+1]; /* booted kernel file */
 302
 303 struct allowedpeer *AllowedPeers; /* List of allowed peers */
 304 static int      NumAllowed;     /* Number of entries in AllowedPeers */
 305 static int      RemoteAddDate;  /* Always set the date on remote messages */
 306
 307 static int      UniquePriority; /* Only log specified priority? */
 308 static int      LogFacPri;      /* Put facility and priority in log message: */
 309                                 /* 0=no, 1=numeric, 2=names */
 310 static int      KeepKernFac;    /* Keep remotely logged kernel facility */
 311 static int      needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
 312 static struct pidfh *pfh;
 313
 314 volatile sig_atomic_t MarkSet, WantDie;
 315
 316 static int      allowaddr(char *);
 317 static void     cfline(const char *, struct filed *,
 318                     const char *, const char *);
 319 static const char *cvthname(struct sockaddr *);
 320 static void     deadq_enter(pid_t, const char *);
 321 static int      deadq_remove(pid_t);
 322 static int      decode(const char *, const CODE *);
 323 static void     die(int);
 324 static void     dodie(int);
 325 static void     dofsync(void);
 326 static void     domark(int);
 327 static void     fprintlog(struct filed *, int, const char *);
 328 static int      *socksetup(int, char *);
 329 static void     init(int);
 330 static void     logerror(const char *);
 331 static void     logmsg(int, const char *, const char *, int);
 332 static void     log_deadchild(pid_t, int, const char *);
 333 static void     markit(void);
 334 static int      skip_message(const char *, const char *, int);
 335 static void     printline(const char *, char *, int);
 336 static void     printsys(char *);
 337 static int      p_open(const char *, pid_t *);
 338 static void     readklog(void);
 339 static void     reapchild(int);
 340 static void     usage(void);
 341 static int      validate(struct sockaddr *, const char *);
 342 static void     unmapped(struct sockaddr *);
 343 static void     wallmsg(struct filed *, struct iovec *, const int iovlen);
 344 static int      waitdaemon(int, int, int);
 345 static void     timedout(int);
 346 static void     increase_rcvbuf(int);
 347
 348 static void
 349 close_filed(struct filed *f)
 350 {
 351
 352         if (f == NULL || f->f_file == -1)
 353                 return;
 354
 355         switch (f->f_type) {
 356         case F_FORW:
 357             if (f->f_un.f_forw.f_addr) {
 358                 freeaddrinfo(f->f_un.f_forw.f_addr);
 359                 f->f_un.f_forw.f_addr = NULL;
 360             }
 361             /*FALLTHROUGH*/
 362
 363         case F_FILE:
 364         case F_TTY:
 365         case F_CONSOLE:
 366                 f->f_type = F_UNUSED;
 367                 break;
 368         case F_PIPE:
 369                 f->f_un.f_pipe.f_pid = 0;
 370                 break;
 371         }
 372         (void)close(f->f_file);
 373         f->f_file = -1;
 374 }
 375
 376 int
 377 main(int argc, char *argv[])
 378 {
 379         int ch, i, fdsrmax = 0, l;
 380         struct sockaddr_un sunx, fromunix;
 381         struct sockaddr_storage frominet;
 382         fd_set *fdsr = NULL;
 383         char line[MAXLINE + 1];
 384         char *bindhostname;
 385         const char *hname;
 386         struct timeval tv, *tvp;
 387         struct sigaction sact;
 388         struct funix *fx, *fx1;
 389         sigset_t mask;
 390         pid_t ppid = 1, spid;
 391         socklen_t len;
 392
 393         if (madvise(NULL, 0, MADV_PROTECT) != 0)
 394                 dprintf("madvise() failed: %s\n", strerror(errno));
 395
 396         bindhostname = NULL;
 397         while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv"))
 398             != -1)
 399                 switch (ch) {
 400                 case '4':
 401                         family = PF_INET;
 402                         break;
 403 #ifdef INET6
 404                 case '6':
 405                         family = PF_INET6;
 406                         break;
 407 #endif
 408                 case '8':
 409                         mask_C1 = 0;
 410                         break;
 411                 case 'A':
 412                         send_to_all++;
 413                         break;
 414                 case 'a':               /* allow specific network addresses only */
 415                         if (allowaddr(optarg) == -1)
 416                                 usage();
 417                         break;
 418                 case 'b':
 419                         bindhostname = optarg;
 420                         break;
 421                 case 'c':
 422                         no_compress++;
 423                         break;
 424                 case 'C':
 425                         logflags |= O_CREAT;
 426                         break;
 427                 case 'd':               /* debug */
 428                         Debug++;
 429                         break;
 430                 case 'f':               /* configuration file */
 431                         ConfFile = optarg;
 432                         break;
 433                 case 'F':               /* run in foreground instead of daemon */
 434                         Foreground++;
 435                         break;
 436                 case 'k':               /* keep remote kern fac */
 437                         KeepKernFac = 1;
 438                         break;
 439                 case 'l':
 440                     {
 441                         long    perml;
 442                         mode_t  mode;
 443                         char    *name, *ep;
 444
 445                         if (optarg[0] == '/') {
 446                                 mode = DEFFILEMODE;
 447                                 name = optarg;
 448                         } else if ((name = strchr(optarg, ':')) != NULL) {
 449                                 *name++ = '\0';
 450                                 if (name[0] != '/')
 451                                         errx(1, "socket name must be absolute "
 452                                             "path");
 453                                 if (isdigit(*optarg)) {
 454                                         perml = strtol(optarg, &ep, 8);
 455                                     if (*ep || perml < 0 ||
 456                                         perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
 457                                             errx(1, "invalid mode %s, exiting",
 458                                                 optarg);
 459                                     mode = (mode_t )perml;
 460                                 } else
 461                                         errx(1, "invalid mode %s, exiting",
 462                                             optarg);
 463                         } else  /* doesn't begin with '/', and no ':' */
 464                                 errx(1, "can't parse path %s", optarg);
 465
 466                         if (strlen(name) >= sizeof(sunx.sun_path))
 467                                 errx(1, "%s path too long, exiting", name);
 468                         if ((fx = malloc(sizeof(struct funix))) == NULL)
 469                                 errx(1, "malloc failed");
 470                         fx->s = -1;
 471                         fx->name = name;
 472                         fx->mode = mode;
 473                         STAILQ_INSERT_TAIL(&funixes, fx, next);
 474                         break;
 475                    }
 476                 case 'm':               /* mark interval */
 477                         MarkInterval = atoi(optarg) * 60;
 478                         break;
 479                 case 'N':
 480                         NoBind = 1;
 481                         SecureMode = 1;
 482                         break;
 483                 case 'n':
 484                         resolve = 0;
 485                         break;
 486                 case 'o':
 487                         use_bootfile = 1;
 488                         break;
 489                 case 'p':               /* path */
 490                         if (strlen(optarg) >= sizeof(sunx.sun_path))
 491                                 errx(1, "%s path too long, exiting", optarg);
 492                         funix_default.name = optarg;
 493                         break;
 494                 case 'P':               /* path for alt. PID */
 495                         PidFile = optarg;
 496                         break;
 497                 case 's':               /* no network mode */
 498                         SecureMode++;
 499                         break;
 500                 case 'S':               /* path for privileged originator */
 501                         if (strlen(optarg) >= sizeof(sunx.sun_path))
 502                                 errx(1, "%s path too long, exiting", optarg);
 503                         funix_secure.name = optarg;
 504                         break;
 505                 case 'T':
 506                         RemoteAddDate = 1;
 507                         break;
 508                 case 'u':               /* only log specified priority */
 509                         UniquePriority++;
 510                         break;
 511                 case 'v':               /* log facility and priority */
 512                         LogFacPri++;
 513                         break;
 514                 default:
 515                         usage();
 516                 }
 517         if ((argc -= optind) != 0)
 518                 usage();
 519
 520         pfh = pidfile_open(PidFile, 0600, &spid);
 521         if (pfh == NULL) {
 522                 if (errno == EEXIST)
 523                         errx(1, "syslogd already running, pid: %d", spid);
 524                 warn("cannot open pid file");
 525         }
 526
 527         if ((!Foreground) && (!Debug)) {
 528                 ppid = waitdaemon(0, 0, 30);
 529                 if (ppid < 0) {
 530                         warn("could not become daemon");
 531                         pidfile_remove(pfh);
 532                         exit(1);
 533                 }
 534         } else if (Debug) {
 535                 setlinebuf(stdout);
 536         }
 537
 538         if (NumAllowed)
 539                 endservent();
 540
 541         consfile.f_type = F_CONSOLE;
 542         (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
 543             sizeof(consfile.f_un.f_fname));
 544         (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
 545         (void)signal(SIGTERM, dodie);
 546         (void)signal(SIGINT, Debug ? dodie : SIG_IGN);
 547         (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
 548         /*
 549          * We don't want the SIGCHLD and SIGHUP handlers to interfere
 550          * with each other; they are likely candidates for being called
 551          * simultaneously (SIGHUP closes pipe descriptor, process dies,
 552          * SIGCHLD happens).
 553          */
 554         sigemptyset(&mask);
 555         sigaddset(&mask, SIGHUP);
 556         sact.sa_handler = reapchild;
 557         sact.sa_mask = mask;
 558         sact.sa_flags = SA_RESTART;
 559         (void)sigaction(SIGCHLD, &sact, NULL);
 560         (void)signal(SIGALRM, domark);
 561         (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
 562         (void)alarm(TIMERINTVL);
 563
 564         TAILQ_INIT(&deadq_head);
 565
 566 #ifndef SUN_LEN
 567 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
 568 #endif
 569         STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) {
 570                 (void)unlink(fx->name);
 571                 memset(&sunx, 0, sizeof(sunx));
 572                 sunx.sun_family = AF_LOCAL;
 573                 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
 574                 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0);
 575                 if (fx->s < 0 ||
 576                     bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
 577                     chmod(fx->name, fx->mode) < 0) {
 578                         (void)snprintf(line, sizeof line,
 579                                         "cannot create %s", fx->name);
 580                         logerror(line);
 581                         dprintf("cannot create %s (%d)\n", fx->name, errno);
 582                         if (fx == &funix_default || fx == &funix_secure)
 583                                 die(0);
 584                         else {
 585                                 STAILQ_REMOVE(&funixes, fx, funix, next);
 586                                 continue;
 587                         }
 588                 }
 589                 increase_rcvbuf(fx->s);
 590         }
 591         if (SecureMode <= 1)
 592                 finet = socksetup(family, bindhostname);
 593
 594         if (finet) {
 595                 if (SecureMode) {
 596                         for (i = 0; i < *finet; i++) {
 597                                 if (shutdown(finet[i+1], SHUT_RD) < 0 &&
 598                                     errno != ENOTCONN) {
 599                                         logerror("shutdown");
 600                                         if (!Debug)
 601                                                 die(0);
 602                                 }
 603                         }
 604                 } else {
 605                         dprintf("listening on inet and/or inet6 socket\n");
 606                 }
 607                 dprintf("sending on inet and/or inet6 socket\n");
 608         }
 609
 610         if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
 611                 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
 612                         fklog = -1;
 613         if (fklog < 0)
 614                 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
 615
 616         /* tuck my process id away */
 617         pidfile_write(pfh);
 618
 619         dprintf("off & running....\n");
 620
 621         init(0);
 622         /* prevent SIGHUP and SIGCHLD handlers from running in parallel */
 623         sigemptyset(&mask);
 624         sigaddset(&mask, SIGCHLD);
 625         sact.sa_handler = init;
 626         sact.sa_mask = mask;
 627         sact.sa_flags = SA_RESTART;
 628         (void)sigaction(SIGHUP, &sact, NULL);
 629
 630         tvp = &tv;
 631         tv.tv_sec = tv.tv_usec = 0;
 632
 633         if (fklog != -1 && fklog > fdsrmax)
 634                 fdsrmax = fklog;
 635         if (finet && !SecureMode) {
 636                 for (i = 0; i < *finet; i++) {
 637                     if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
 638                         fdsrmax = finet[i+1];
 639                 }
 640         }
 641         STAILQ_FOREACH(fx, &funixes, next)
 642                 if (fx->s > fdsrmax)
 643                         fdsrmax = fx->s;
 644
 645         fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
 646             sizeof(*fdsr));
 647         if (fdsr == NULL)
 648                 errx(1, "calloc fd_set");
 649
 650         for (;;) {
 651                 if (MarkSet)
 652                         markit();
 653                 if (WantDie)
 654                         die(WantDie);
 655
 656                 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
 657                     sizeof(*fdsr));
 658
 659                 if (fklog != -1)
 660                         FD_SET(fklog, fdsr);
 661                 if (finet && !SecureMode) {
 662                         for (i = 0; i < *finet; i++) {
 663                                 if (finet[i+1] != -1)
 664                                         FD_SET(finet[i+1], fdsr);
 665                         }
 666                 }
 667                 STAILQ_FOREACH(fx, &funixes, next)
 668                         FD_SET(fx->s, fdsr);
 669
 670                 i = select(fdsrmax+1, fdsr, NULL, NULL,
 671                     needdofsync ? &tv : tvp);
 672                 switch (i) {
 673                 case 0:
 674                         dofsync();
 675                         needdofsync = 0;
 676                         if (tvp) {
 677                                 tvp = NULL;
 678                                 if (ppid != 1)
 679                                         kill(ppid, SIGALRM);
 680                         }
 681                         continue;
 682                 case -1:
 683                         if (errno != EINTR)
 684                                 logerror("select");
 685                         continue;
 686                 }
 687                 if (fklog != -1 && FD_ISSET(fklog, fdsr))
 688                         readklog();
 689                 if (finet && !SecureMode) {
 690                         for (i = 0; i < *finet; i++) {
 691                                 if (FD_ISSET(finet[i+1], fdsr)) {
 692                                         len = sizeof(frominet);
 693                                         l = recvfrom(finet[i+1], line, MAXLINE,
 694                                              0, (struct sockaddr *)&frominet,
 695                                              &len);
 696                                         if (l > 0) {
 697                                                 line[l] = '\0';
 698                                                 hname = cvthname((struct sockaddr *)&frominet);
 699                                                 unmapped((struct sockaddr *)&frominet);
 700                                                 if (validate((struct sockaddr *)&frominet, hname))
 701                                                         printline(hname, line, RemoteAddDate ? ADDDATE : 0);
 702                                         } else if (l < 0 && errno != EINTR)
 703                                                 logerror("recvfrom inet");
 704                                 }
 705                         }
 706                 }
 707                 STAILQ_FOREACH(fx, &funixes, next) {
 708                         if (FD_ISSET(fx->s, fdsr)) {
 709                                 len = sizeof(fromunix);
 710                                 l = recvfrom(fx->s, line, MAXLINE, 0,
 711                                     (struct sockaddr *)&fromunix, &len);
 712                                 if (l > 0) {
 713                                         line[l] = '\0';
 714                                         printline(LocalHostName, line, 0);
 715                                 } else if (l < 0 && errno != EINTR)
 716                                         logerror("recvfrom unix");
 717                         }
 718                 }
 719         }
 720         if (fdsr)
 721                 free(fdsr);
 722 }
 723
 724 static void
 725 unmapped(struct sockaddr *sa)
 726 {
 727         struct sockaddr_in6 *sin6;
 728         struct sockaddr_in sin4;
 729
 730         if (sa->sa_family != AF_INET6)
 731                 return;
 732         if (sa->sa_len != sizeof(struct sockaddr_in6) ||
 733             sizeof(sin4) > sa->sa_len)
 734                 return;
 735         sin6 = (struct sockaddr_in6 *)sa;
 736         if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
 737                 return;
 738
 739         memset(&sin4, 0, sizeof(sin4));
 740         sin4.sin_family = AF_INET;
 741         sin4.sin_len = sizeof(struct sockaddr_in);
 742         memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
 743                sizeof(sin4.sin_addr));
 744         sin4.sin_port = sin6->sin6_port;
 745
 746         memcpy(sa, &sin4, sin4.sin_len);
 747 }
 748
 749 static void
 750 usage(void)
 751 {
 752
 753         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 754                 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]",
 755                 "               [-b bind_address] [-f config_file]",
 756                 "               [-l [mode:]path] [-m mark_interval]",
 757                 "               [-P pid_file] [-p log_socket]");
 758         exit(1);
 759 }
 760
 761 /*
 762  * Take a raw input line, decode the message, and print the message
 763  * on the appropriate log files.
 764  */
 765 static void
 766 printline(const char *hname, char *msg, int flags)
 767 {
 768         char *p, *q;
 769         long n;
 770         int c, pri;
 771         char line[MAXLINE + 1];
 772
 773         /* test for special codes */
 774         p = msg;
 775         pri = DEFUPRI;
 776         if (*p == '<') {
 777                 errno = 0;
 778                 n = strtol(p + 1, &q, 10);
 779                 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
 780                         p = q + 1;
 781                         pri = n;
 782                 }
 783         }
 784         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
 785                 pri = DEFUPRI;
 786
 787         /*
 788          * Don't allow users to log kernel messages.
 789          * NOTE: since LOG_KERN == 0 this will also match
 790          *       messages with no facility specified.
 791          */
 792         if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
 793                 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
 794
 795         q = line;
 796
 797         while ((c = (unsigned char)*p++) != '\0' &&
 798             q < &line[sizeof(line) - 4]) {
 799                 if (mask_C1 && (c & 0x80) && c < 0xA0) {
 800                         c &= 0x7F;
 801                         *q++ = 'M';
 802                         *q++ = '-';
 803                 }
 804                 if (isascii(c) && iscntrl(c)) {
 805                         if (c == '\n') {
 806                                 *q++ = ' ';
 807                         } else if (c == '\t') {
 808                                 *q++ = '\t';
 809                         } else {
 810                                 *q++ = '^';
 811                                 *q++ = c ^ 0100;
 812                         }
 813                 } else {
 814                         *q++ = c;
 815                 }
 816         }
 817         *q = '\0';
 818
 819         logmsg(pri, line, hname, flags);
 820 }
 821
 822 /*
 823  * Read /dev/klog while data are available, split into lines.
 824  */
 825 static void
 826 readklog(void)
 827 {
 828         char *p, *q, line[MAXLINE + 1];
 829         int len, i;
 830
 831         len = 0;
 832         for (;;) {
 833                 i = read(fklog, line + len, MAXLINE - 1 - len);
 834                 if (i > 0) {
 835                         line[i + len] = '\0';
 836                 } else {
 837                         if (i < 0 && errno != EINTR && errno != EAGAIN) {
 838                                 logerror("klog");
 839                                 fklog = -1;
 840                         }
 841                         break;
 842                 }
 843
 844                 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
 845                         *q = '\0';
 846                         printsys(p);
 847                 }
 848                 len = strlen(p);
 849                 if (len >= MAXLINE - 1) {
 850                         printsys(p);
 851                         len = 0;
 852                 }
 853                 if (len > 0)
 854                         memmove(line, p, len + 1);
 855         }
 856         if (len > 0)
 857                 printsys(line);
 858 }
 859
 860 /*
 861  * Take a raw input line from /dev/klog, format similar to syslog().
 862  */
 863 static void
 864 printsys(char *msg)
 865 {
 866         char *p, *q;
 867         long n;
 868         int flags, isprintf, pri;
 869
 870         flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
 871         p = msg;
 872         pri = DEFSPRI;
 873         isprintf = 1;
 874         if (*p == '<') {
 875                 errno = 0;
 876                 n = strtol(p + 1, &q, 10);
 877                 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
 878                         p = q + 1;
 879                         pri = n;
 880                         isprintf = 0;
 881                 }
 882         }
 883         /*
 884          * Kernel printf's and LOG_CONSOLE messages have been displayed
 885          * on the console already.
 886          */
 887         if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
 888                 flags |= IGN_CONS;
 889         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
 890                 pri = DEFSPRI;
 891         logmsg(pri, p, LocalHostName, flags);
 892 }
 893
 894 static time_t   now;
 895
 896 /*
 897  * Match a program or host name against a specification.
 898  * Return a non-0 value if the message must be ignored
 899  * based on the specification.
 900  */
 901 static int
 902 skip_message(const char *name, const char *spec, int checkcase)
 903 {
 904         const char *s;
 905         char prev, next;
 906         int exclude = 0;
 907         /* Behaviour on explicit match */
 908
 909         if (spec == NULL)
 910                 return 0;
 911         switch (*spec) {
 912         case '-':
 913                 exclude = 1;
 914                 /*FALLTHROUGH*/
 915         case '+':
 916                 spec++;
 917                 break;
 918         default:
 919                 break;
 920         }
 921         if (checkcase)
 922                 s = strstr (spec, name);
 923         else
 924                 s = strcasestr (spec, name);
 925
 926         if (s != NULL) {
 927                 prev = (s == spec ? ',' : *(s - 1));
 928                 next = *(s + strlen (name));
 929
 930                 if (prev == ',' && (next == '\0' || next == ','))
 931                         /* Explicit match: skip iff the spec is an
 932                            exclusive one. */
 933                         return exclude;
 934         }
 935
 936         /* No explicit match for this name: skip the message iff
 937            the spec is an inclusive one. */
 938         return !exclude;
 939 }
 940
 941 /*
 942  * Log a message to the appropriate log files, users, etc. based on
 943  * the priority.
 944  */
 945 static void
 946 logmsg(int pri, const char *msg, const char *from, int flags)
 947 {
 948         struct filed *f;
 949         int i, fac, msglen, omask, prilev;
 950         const char *timestamp;
 951         char prog[NAME_MAX+1];
 952         char buf[MAXLINE+1];
 953
 954         dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
 955             pri, flags, from, msg);
 956
 957         omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
 958
 959         /*
 960          * Check to see if msg looks non-standard.
 961          */
 962         msglen = strlen(msg);
 963         if (msglen < MAXDATELEN || msg[3] != ' ' || msg[6] != ' ' ||
 964             msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
 965                 flags |= ADDDATE;
 966
 967         (void)time(&now);
 968         if (flags & ADDDATE) {
 969                 timestamp = ctime(&now) + 4;
 970         } else {
 971                 timestamp = msg;
 972                 msg += MAXDATELEN;
 973                 msglen -= MAXDATELEN;
 974         }
 975
 976         /* skip leading blanks */
 977         while (isspace(*msg)) {
 978                 msg++;
 979                 msglen--;
 980         }
 981
 982         /* extract facility and priority level */
 983         if (flags & MARK)
 984                 fac = LOG_NFACILITIES;
 985         else
 986                 fac = LOG_FAC(pri);
 987
 988         /* Check maximum facility number. */
 989         if (fac > LOG_NFACILITIES) {
 990                 (void)sigsetmask(omask);
 991                 return;
 992         }
 993
 994         prilev = LOG_PRI(pri);
 995
 996         /* extract program name */
 997         for (i = 0; i < NAME_MAX; i++) {
 998                 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
 999                     msg[i] == '/' || isspace(msg[i]))
1000                         break;
1001                 prog[i] = msg[i];
1002         }
1003         prog[i] = 0;
1004
1005         /* add kernel prefix for kernel messages */
1006         if (flags & ISKERNEL) {
1007                 snprintf(buf, sizeof(buf), "%s: %s",
1008                     use_bootfile ? bootfile : "kernel", msg);
1009                 msg = buf;
1010                 msglen = strlen(buf);
1011         }
1012
1013         /* log the message to the particular outputs */
1014         if (!Initialized) {
1015                 f = &consfile;
1016                 /*
1017                  * Open in non-blocking mode to avoid hangs during open
1018                  * and close(waiting for the port to drain).
1019                  */
1020                 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
1021
1022                 if (f->f_file >= 0) {
1023                         (void)strlcpy(f->f_lasttime, timestamp,
1024                                 sizeof(f->f_lasttime));
1025                         fprintlog(f, flags, msg);
1026                         close(f->f_file);
1027                         f->f_file = -1;
1028                 }
1029                 (void)sigsetmask(omask);
1030                 return;
1031         }
1032         for (f = Files; f; f = f->f_next) {
1033                 /* skip messages that are incorrect priority */
1034                 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
1035                      ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
1036                      ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
1037                      )
1038                     || f->f_pmask[fac] == INTERNAL_NOPRI)
1039                         continue;
1040
1041                 /* skip messages with the incorrect hostname */
1042                 if (skip_message(from, f->f_host, 0))
1043                         continue;
1044
1045                 /* skip messages with the incorrect program name */
1046                 if (skip_message(prog, f->f_program, 1))
1047                         continue;
1048
1049                 /* skip message to console if it has already been printed */
1050                 if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1051                         continue;
1052
1053                 /* don't output marks to recently written files */
1054                 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1055                         continue;
1056
1057                 /*
1058                  * suppress duplicate lines to this file
1059                  */
1060                 if (no_compress - (f->f_type != F_PIPE) < 1 &&
1061                     (flags & MARK) == 0 && msglen == f->f_prevlen &&
1062                     !strcmp(msg, f->f_prevline) &&
1063                     !strcasecmp(from, f->f_prevhost)) {
1064                         (void)strlcpy(f->f_lasttime, timestamp,
1065                                 sizeof(f->f_lasttime));
1066                         f->f_prevcount++;
1067                         dprintf("msg repeated %d times, %ld sec of %d\n",
1068                             f->f_prevcount, (long)(now - f->f_time),
1069                             repeatinterval[f->f_repeatcount]);
1070                         /*
1071                          * If domark would have logged this by now,
1072                          * flush it now (so we don't hold isolated messages),
1073                          * but back off so we'll flush less often
1074                          * in the future.
1075                          */
1076                         if (now > REPEATTIME(f)) {
1077                                 fprintlog(f, flags, (char *)NULL);
1078                                 BACKOFF(f);
1079                         }
1080                 } else {
1081                         /* new line, save it */
1082                         if (f->f_prevcount)
1083                                 fprintlog(f, 0, (char *)NULL);
1084                         f->f_repeatcount = 0;
1085                         f->f_prevpri = pri;
1086                         (void)strlcpy(f->f_lasttime, timestamp,
1087                                 sizeof(f->f_lasttime));
1088                         (void)strlcpy(f->f_prevhost, from,
1089                             sizeof(f->f_prevhost));
1090                         if (msglen < MAXSVLINE) {
1091                                 f->f_prevlen = msglen;
1092                                 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
1093                                 fprintlog(f, flags, (char *)NULL);
1094                         } else {
1095                                 f->f_prevline[0] = 0;
1096                                 f->f_prevlen = 0;
1097                                 fprintlog(f, flags, msg);
1098                         }
1099                 }
1100         }
1101         (void)sigsetmask(omask);
1102 }
1103
1104 static void
1105 dofsync(void)
1106 {
1107         struct filed *f;
1108
1109         for (f = Files; f; f = f->f_next) {
1110                 if ((f->f_type == F_FILE) &&
1111                     (f->f_flags & FFLAG_NEEDSYNC)) {
1112                         f->f_flags &= ~FFLAG_NEEDSYNC;
1113                         (void)fsync(f->f_file);
1114                 }
1115         }
1116 }
1117
1118 #define IOV_SIZE 7
1119 static void
1120 fprintlog(struct filed *f, int flags, const char *msg)
1121 {
1122         struct iovec iov[IOV_SIZE];
1123         struct iovec *v;
1124         struct addrinfo *r;
1125         int i, l, lsent = 0;
1126         char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1127         char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1128         const char *msgret;
1129
1130         v = iov;
1131         if (f->f_type == F_WALL) {
1132                 v->iov_base = greetings;
1133                 /* The time displayed is not synchornized with the other log
1134                  * destinations (like messages).  Following fragment was using
1135                  * ctime(&now), which was updating the time every 30 sec.
1136                  * With f_lasttime, time is synchronized correctly.
1137                  */
1138                 v->iov_len = snprintf(greetings, sizeof greetings,
1139                     "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1140                     f->f_prevhost, f->f_lasttime);
1141                 if (v->iov_len >= sizeof greetings)
1142                         v->iov_len = sizeof greetings - 1;
1143                 v++;
1144                 v->iov_base = nul;
1145                 v->iov_len = 0;
1146                 v++;
1147         } else {
1148                 v->iov_base = f->f_lasttime;
1149                 v->iov_len = strlen(f->f_lasttime);
1150                 v++;
1151                 v->iov_base = space;
1152                 v->iov_len = 1;
1153                 v++;
1154         }
1155
1156         if (LogFacPri) {
1157                 static char fp_buf[30]; /* Hollow laugh */
1158                 int fac = f->f_prevpri & LOG_FACMASK;
1159                 int pri = LOG_PRI(f->f_prevpri);
1160                 const char *f_s = NULL;
1161                 char f_n[5];    /* Hollow laugh */
1162                 const char *p_s = NULL;
1163                 char p_n[5];    /* Hollow laugh */
1164
1165                 if (LogFacPri > 1) {
1166                   const CODE *c;
1167
1168                   for (c = facilitynames; c->c_name; c++) {
1169                     if (c->c_val == fac) {
1170                       f_s = c->c_name;
1171                       break;
1172                     }
1173                   }
1174                   for (c = prioritynames; c->c_name; c++) {
1175                     if (c->c_val == pri) {
1176                       p_s = c->c_name;
1177                       break;
1178                     }
1179                   }
1180                 }
1181                 if (!f_s) {
1182                   snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1183                   f_s = f_n;
1184                 }
1185                 if (!p_s) {
1186                   snprintf(p_n, sizeof p_n, "%d", pri);
1187                   p_s = p_n;
1188                 }
1189                 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1190                 v->iov_base = fp_buf;
1191                 v->iov_len = strlen(fp_buf);
1192         } else {
1193                 v->iov_base = nul;
1194                 v->iov_len = 0;
1195         }
1196         v++;
1197
1198         v->iov_base = f->f_prevhost;
1199         v->iov_len = strlen(v->iov_base);
1200         v++;
1201         v->iov_base = space;
1202         v->iov_len = 1;
1203         v++;
1204
1205         if (msg) {
1206                 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1207                 if (wmsg == NULL) {
1208                         logerror("strdup");
1209                         exit(1);
1210                 }
1211                 v->iov_base = wmsg;
1212                 v->iov_len = strlen(msg);
1213         } else if (f->f_prevcount > 1) {
1214                 v->iov_base = repbuf;
1215                 v->iov_len = snprintf(repbuf, sizeof repbuf,
1216                     "last message repeated %d times", f->f_prevcount);
1217         } else {
1218                 v->iov_base = f->f_prevline;
1219                 v->iov_len = f->f_prevlen;
1220         }
1221         v++;
1222
1223         dprintf("Logging to %s", TypeNames[f->f_type]);
1224         f->f_time = now;
1225
1226         switch (f->f_type) {
1227                 int port;
1228         case F_UNUSED:
1229                 dprintf("\n");
1230                 break;
1231
1232         case F_FORW:
1233                 port = (int)ntohs(((struct sockaddr_in *)
1234                             (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1235                 if (port != 514) {
1236                         dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1237                 } else {
1238                         dprintf(" %s\n", f->f_un.f_forw.f_hname);
1239                 }
1240                 /* check for local vs remote messages */
1241                 if (strcasecmp(f->f_prevhost, LocalHostName))
1242                         l = snprintf(line, sizeof line - 1,
1243                             "<%d>%.15s Forwarded from %s: %s",
1244                             f->f_prevpri, (char *)iov[0].iov_base,
1245                             f->f_prevhost, (char *)iov[5].iov_base);
1246                 else
1247                         l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1248                              f->f_prevpri, (char *)iov[0].iov_base,
1249                             (char *)iov[5].iov_base);
1250                 if (l < 0)
1251                         l = 0;
1252                 else if (l > MAXLINE)
1253                         l = MAXLINE;
1254
1255                 if (finet) {
1256                         for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1257                                 for (i = 0; i < *finet; i++) {
1258 #if 0
1259                                         /*
1260                                          * should we check AF first, or just
1261                                          * trial and error? FWD
1262                                          */
1263                                         if (r->ai_family ==
1264                                             address_family_of(finet[i+1]))
1265 #endif
1266                                         lsent = sendto(finet[i+1], line, l, 0,
1267                                             r->ai_addr, r->ai_addrlen);
1268                                         if (lsent == l)
1269                                                 break;
1270                                 }
1271                                 if (lsent == l && !send_to_all)
1272                                         break;
1273                         }
1274                         dprintf("lsent/l: %d/%d\n", lsent, l);
1275                         if (lsent != l) {
1276                                 int e = errno;
1277                                 logerror("sendto");
1278                                 errno = e;
1279                                 switch (errno) {
1280                                 case ENOBUFS:
1281                                 case ENETDOWN:
1282                                 case ENETUNREACH:
1283                                 case EHOSTUNREACH:
1284                                 case EHOSTDOWN:
1285                                 case EADDRNOTAVAIL:
1286                                         break;
1287                                 /* case EBADF: */
1288                                 /* case EACCES: */
1289                                 /* case ENOTSOCK: */
1290                                 /* case EFAULT: */
1291                                 /* case EMSGSIZE: */
1292                                 /* case EAGAIN: */
1293                                 /* case ENOBUFS: */
1294                                 /* case ECONNREFUSED: */
1295                                 default:
1296                                         dprintf("removing entry: errno=%d\n", e);
1297                                         f->f_type = F_UNUSED;
1298                                         break;
1299                                 }
1300                         }
1301                 }
1302                 break;
1303
1304         case F_FILE:
1305                 dprintf(" %s\n", f->f_un.f_fname);
1306                 v->iov_base = lf;
1307                 v->iov_len = 1;
1308                 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1309                         /*
1310                          * If writev(2) fails for potentially transient errors
1311                          * like the filesystem being full, ignore it.
1312                          * Otherwise remove this logfile from the list.
1313                          */
1314                         if (errno != ENOSPC) {
1315                                 int e = errno;
1316                                 close_filed(f);
1317                                 errno = e;
1318                                 logerror(f->f_un.f_fname);
1319                         }
1320                 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1321                         f->f_flags |= FFLAG_NEEDSYNC;
1322                         needdofsync = 1;
1323                 }
1324                 break;
1325
1326         case F_PIPE:
1327                 dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1328                 v->iov_base = lf;
1329                 v->iov_len = 1;
1330                 if (f->f_un.f_pipe.f_pid == 0) {
1331                         if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1332                                                 &f->f_un.f_pipe.f_pid)) < 0) {
1333                                 logerror(f->f_un.f_pipe.f_pname);
1334                                 break;
1335                         }
1336                 }
1337                 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1338                         int e = errno;
1339
1340                         close_filed(f);
1341                         deadq_enter(f->f_un.f_pipe.f_pid,
1342                                     f->f_un.f_pipe.f_pname);
1343                         errno = e;
1344                         logerror(f->f_un.f_pipe.f_pname);
1345                 }
1346                 break;
1347
1348         case F_CONSOLE:
1349                 if (flags & IGN_CONS) {
1350                         dprintf(" (ignored)\n");
1351                         break;
1352                 }
1353                 /* FALLTHROUGH */
1354
1355         case F_TTY:
1356                 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1357                 v->iov_base = crlf;
1358                 v->iov_len = 2;
1359
1360                 errno = 0;      /* ttymsg() only sometimes returns an errno */
1361                 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) {
1362                         f->f_type = F_UNUSED;
1363                         logerror(msgret);
1364                 }
1365                 break;
1366
1367         case F_USERS:
1368         case F_WALL:
1369                 dprintf("\n");
1370                 v->iov_base = crlf;
1371                 v->iov_len = 2;
1372                 wallmsg(f, iov, IOV_SIZE);
1373                 break;
1374         }
1375         f->f_prevcount = 0;
1376         free(wmsg);
1377 }
1378
1379 /*
1380  *  WALLMSG -- Write a message to the world at large
1381  *
1382  *      Write the specified message to either the entire
1383  *      world, or a list of approved users.
1384  */
1385 static void
1386 wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1387 {
1388         static int reenter;                     /* avoid calling ourselves */
1389         struct utmpx *ut;
1390         int i;
1391         const char *p;
1392
1393         if (reenter++)
1394                 return;
1395         setutxent();
1396         /* NOSTRICT */
1397         while ((ut = getutxent()) != NULL) {
1398                 if (ut->ut_type != USER_PROCESS)
1399                         continue;
1400                 if (f->f_type == F_WALL) {
1401                         if ((p = ttymsg(iov, iovlen, ut->ut_line,
1402                             TTYMSGTIME)) != NULL) {
1403                                 errno = 0;      /* already in msg */
1404                                 logerror(p);
1405                         }
1406                         continue;
1407                 }
1408                 /* should we send the message to this user? */
1409                 for (i = 0; i < MAXUNAMES; i++) {
1410                         if (!f->f_un.f_uname[i][0])
1411                                 break;
1412                         if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) {
1413                                 if ((p = ttymsg(iov, iovlen, ut->ut_line,
1414                                     TTYMSGTIME)) != NULL) {
1415                                         errno = 0;      /* already in msg */
1416                                         logerror(p);
1417                                 }
1418                                 break;
1419                         }
1420                 }
1421         }
1422         endutxent();
1423         reenter = 0;
1424 }
1425
1426 static void
1427 reapchild(int signo __unused)
1428 {
1429         int status;
1430         pid_t pid;
1431         struct filed *f;
1432
1433         while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
1434                 if (!Initialized)
1435                         /* Don't tell while we are initting. */
1436                         continue;
1437
1438                 /* First, look if it's a process from the dead queue. */
1439                 if (deadq_remove(pid))
1440                         goto oncemore;
1441
1442                 /* Now, look in list of active processes. */
1443                 for (f = Files; f; f = f->f_next)
1444                         if (f->f_type == F_PIPE &&
1445                             f->f_un.f_pipe.f_pid == pid) {
1446                                 close_filed(f);
1447                                 log_deadchild(pid, status,
1448                                               f->f_un.f_pipe.f_pname);
1449                                 break;
1450                         }
1451           oncemore:
1452                 continue;
1453         }
1454 }
1455
1456 /*
1457  * Return a printable representation of a host address.
1458  */
1459 static const char *
1460 cvthname(struct sockaddr *f)
1461 {
1462         int error, hl;
1463         sigset_t omask, nmask;
1464         static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1465
1466         error = getnameinfo((struct sockaddr *)f,
1467                             ((struct sockaddr *)f)->sa_len,
1468                             ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1469         dprintf("cvthname(%s)\n", ip);
1470
1471         if (error) {
1472                 dprintf("Malformed from address %s\n", gai_strerror(error));
1473                 return ("???");
1474         }
1475         if (!resolve)
1476                 return (ip);
1477
1478         sigemptyset(&nmask);
1479         sigaddset(&nmask, SIGHUP);
1480         sigprocmask(SIG_BLOCK, &nmask, &omask);
1481         error = getnameinfo((struct sockaddr *)f,
1482                             ((struct sockaddr *)f)->sa_len,
1483                             hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1484         sigprocmask(SIG_SETMASK, &omask, NULL);
1485         if (error) {
1486                 dprintf("Host name for your address (%s) unknown\n", ip);
1487                 return (ip);
1488         }
1489         hl = strlen(hname);
1490         if (hl > 0 && hname[hl-1] == '.')
1491                 hname[--hl] = '\0';
1492         trimdomain(hname, hl);
1493         return (hname);
1494 }
1495
1496 static void
1497 dodie(int signo)
1498 {
1499
1500         WantDie = signo;
1501 }
1502
1503 static void
1504 domark(int signo __unused)
1505 {
1506
1507         MarkSet = 1;
1508 }
1509
1510 /*
1511  * Print syslogd errors some place.
1512  */
1513 static void
1514 logerror(const char *type)
1515 {
1516         char buf[512];
1517         static int recursed = 0;
1518
1519         /* If there's an error while trying to log an error, give up. */
1520         if (recursed)
1521                 return;
1522         recursed++;
1523         if (errno)
1524                 (void)snprintf(buf,
1525                     sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1526         else
1527                 (void)snprintf(buf, sizeof buf, "syslogd: %s", type);
1528         errno = 0;
1529         dprintf("%s\n", buf);
1530         logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1531         recursed--;
1532 }
1533
1534 static void
1535 die(int signo)
1536 {
1537         struct filed *f;
1538         struct funix *fx;
1539         int was_initialized;
1540         char buf[100];
1541
1542         was_initialized = Initialized;
1543         Initialized = 0;        /* Don't log SIGCHLDs. */
1544         for (f = Files; f != NULL; f = f->f_next) {
1545                 /* flush any pending output */
1546                 if (f->f_prevcount)
1547                         fprintlog(f, 0, (char *)NULL);
1548                 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0)
1549                         close_filed(f);
1550         }
1551         Initialized = was_initialized;
1552         if (signo) {
1553                 dprintf("syslogd: exiting on signal %d\n", signo);
1554                 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1555                 errno = 0;
1556                 logerror(buf);
1557         }
1558         STAILQ_FOREACH(fx, &funixes, next)
1559                 (void)unlink(fx->name);
1560         pidfile_remove(pfh);
1561
1562         exit(1);
1563 }
1564
1565 static int
1566 configfiles(const struct dirent *dp)
1567 {
1568         const char *p;
1569         size_t ext_len;
1570
1571         if (dp->d_name[0] == '.')
1572                 return (0);
1573
1574         ext_len = sizeof(include_ext) -1;
1575
1576         if (dp->d_namlen <= ext_len)
1577                 return (0);
1578
1579         p = &dp->d_name[dp->d_namlen - ext_len];
1580         if (strcmp(p, include_ext) != 0)
1581                 return (0);
1582
1583         return (1);
1584 }
1585
1586 static void
1587 readconfigfile(FILE *cf, struct filed **nextp, int allow_includes)
1588 {
1589         FILE *cf2;
1590         struct filed *f;
1591         struct dirent **ent;
1592         char cline[LINE_MAX];
1593         char host[MAXHOSTNAMELEN];
1594         char prog[LINE_MAX];
1595         char file[MAXPATHLEN];
1596         char *p, *tmp;
1597         int i, nents;
1598         size_t include_len;
1599
1600         /*
1601          *  Foreach line in the conf table, open that file.
1602          */
1603         f = NULL;
1604         include_len = sizeof(include_str) -1;
1605         (void)strlcpy(host, "*", sizeof(host));
1606         (void)strlcpy(prog, "*", sizeof(prog));
1607         while (fgets(cline, sizeof(cline), cf) != NULL) {
1608                 /*
1609                  * check for end-of-section, comments, strip off trailing
1610                  * spaces and newline character. #!prog is treated specially:
1611                  * following lines apply only to that program.
1612                  */
1613                 for (p = cline; isspace(*p); ++p)
1614                         continue;
1615                 if (*p == 0)
1616                         continue;
1617                 if (allow_includes &&
1618                     strncmp(p, include_str, include_len) == 0 &&
1619                     isspace(p[include_len])) {
1620                         p += include_len;
1621                         while (isspace(*p))
1622                                 p++;
1623                         tmp = p;
1624                         while (*tmp != '\0' && !isspace(*tmp))
1625                                 tmp++;
1626                         *tmp = '\0';
1627                         dprintf("Trying to include files in '%s'\n", p);
1628                         nents = scandir(p, &ent, configfiles, alphasort);
1629                         if (nents == -1) {
1630                                 dprintf("Unable to open '%s': %s\n", p,
1631                                     strerror(errno));
1632                                 continue;
1633                         }
1634                         for (i = 0; i < nents; i++) {
1635                                 if (snprintf(file, sizeof(file), "%s/%s", p,
1636                                     ent[i]->d_name) >= (int)sizeof(file)) {
1637                                         dprintf("ignoring path too long: "
1638                                             "'%s/%s'\n", p, ent[i]->d_name);
1639                                         free(ent[i]);
1640                                         continue;
1641                                 }
1642                                 free(ent[i]);
1643                                 cf2 = fopen(file, "r");
1644                                 if (cf2 == NULL)
1645                                         continue;
1646                                 dprintf("reading %s\n", file);
1647                                 readconfigfile(cf2, nextp, 0);
1648                                 fclose(cf2);
1649                         }
1650                         free(ent);
1651                         continue;
1652                 }
1653                 if (*p == '#') {
1654                         p++;
1655                         if (*p != '!' && *p != '+' && *p != '-')
1656                                 continue;
1657                 }
1658                 if (*p == '+' || *p == '-') {
1659                         host[0] = *p++;
1660                         while (isspace(*p))
1661                                 p++;
1662                         if ((!*p) || (*p == '*')) {
1663                                 (void)strlcpy(host, "*", sizeof(host));
1664                                 continue;
1665                         }
1666                         if (*p == '@')
1667                                 p = LocalHostName;
1668                         for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1669                                 if (!isalnum(*p) && *p != '.' && *p != '-'
1670                                     && *p != ',' && *p != ':' && *p != '%')
1671                                         break;
1672                                 host[i] = *p++;
1673                         }
1674                         host[i] = '\0';
1675                         continue;
1676                 }
1677                 if (*p == '!') {
1678                         p++;
1679                         while (isspace(*p)) p++;
1680                         if ((!*p) || (*p == '*')) {
1681                                 (void)strlcpy(prog, "*", sizeof(prog));
1682                                 continue;
1683                         }
1684                         for (i = 0; i < LINE_MAX - 1; i++) {
1685                                 if (!isprint(p[i]) || isspace(p[i]))
1686                                         break;
1687                                 prog[i] = p[i];
1688                         }
1689                         prog[i] = 0;
1690                         continue;
1691                 }
1692                 for (p = cline + 1; *p != '\0'; p++) {
1693                         if (*p != '#')
1694                                 continue;
1695                         if (*(p - 1) == '\\') {
1696                                 strcpy(p - 1, p);
1697                                 p--;
1698                                 continue;
1699                         }
1700                         *p = '\0';
1701                         break;
1702                 }
1703                 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1704                         cline[i] = '\0';
1705                 f = (struct filed *)calloc(1, sizeof(*f));
1706                 if (f == NULL) {
1707                         logerror("calloc");
1708                         exit(1);
1709                 }
1710                 *nextp = f;
1711                 nextp = &f->f_next;
1712                 cfline(cline, f, prog, host);
1713         }
1714 }
1715
1716 /*
1717  *  INIT -- Initialize syslogd from configuration table
1718  */
1719 static void
1720 init(int signo)
1721 {
1722         int i;
1723         FILE *cf;
1724         struct filed *f, *next, **nextp;
1725         char *p;
1726         char oldLocalHostName[MAXHOSTNAMELEN];
1727         char hostMsg[2*MAXHOSTNAMELEN+40];
1728         char bootfileMsg[LINE_MAX];
1729
1730         dprintf("init\n");
1731
1732         /*
1733          * Load hostname (may have changed).
1734          */
1735         if (signo != 0)
1736                 (void)strlcpy(oldLocalHostName, LocalHostName,
1737                     sizeof(oldLocalHostName));
1738         if (gethostname(LocalHostName, sizeof(LocalHostName)))
1739                 err(EX_OSERR, "gethostname() failed");
1740         if ((p = strchr(LocalHostName, '.')) != NULL) {
1741                 *p++ = '\0';
1742                 LocalDomain = p;
1743         } else {
1744                 LocalDomain = "";
1745         }
1746
1747         /*
1748          *  Close all open log files.
1749          */
1750         Initialized = 0;
1751         for (f = Files; f != NULL; f = next) {
1752                 /* flush any pending output */
1753                 if (f->f_prevcount)
1754                         fprintlog(f, 0, (char *)NULL);
1755
1756                 switch (f->f_type) {
1757                 case F_FILE:
1758                 case F_FORW:
1759                 case F_CONSOLE:
1760                 case F_TTY:
1761                         close_filed(f);
1762                         break;
1763                 case F_PIPE:
1764                         close_filed(f);
1765                         deadq_enter(f->f_un.f_pipe.f_pid,
1766                                     f->f_un.f_pipe.f_pname);
1767                         break;
1768                 }
1769                 next = f->f_next;
1770                 if (f->f_program) free(f->f_program);
1771                 if (f->f_host) free(f->f_host);
1772                 free((char *)f);
1773         }
1774         Files = NULL;
1775         nextp = &Files;
1776
1777         /* open the configuration file */
1778         if ((cf = fopen(ConfFile, "r")) == NULL) {
1779                 dprintf("cannot open %s\n", ConfFile);
1780                 *nextp = (struct filed *)calloc(1, sizeof(*f));
1781                 if (*nextp == NULL) {
1782                         logerror("calloc");
1783                         exit(1);
1784                 }
1785                 cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1786                 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1787                 if ((*nextp)->f_next == NULL) {
1788                         logerror("calloc");
1789                         exit(1);
1790                 }
1791                 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1792                 Initialized = 1;
1793                 return;
1794         }
1795
1796         readconfigfile(cf, &Files, 1);
1797
1798         /* close the configuration file */
1799         (void)fclose(cf);
1800
1801         Initialized = 1;
1802
1803         if (Debug) {
1804                 int port;
1805                 for (f = Files; f; f = f->f_next) {
1806                         for (i = 0; i <= LOG_NFACILITIES; i++)
1807                                 if (f->f_pmask[i] == INTERNAL_NOPRI)
1808                                         printf("X ");
1809                                 else
1810                                         printf("%d ", f->f_pmask[i]);
1811                         printf("%s: ", TypeNames[f->f_type]);
1812                         switch (f->f_type) {
1813                         case F_FILE:
1814                                 printf("%s", f->f_un.f_fname);
1815                                 break;
1816
1817                         case F_CONSOLE:
1818                         case F_TTY:
1819                                 printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1820                                 break;
1821
1822                         case F_FORW:
1823                                 port = (int)ntohs(((struct sockaddr_in *)
1824                                     (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1825                                 if (port != 514) {
1826                                         printf("%s:%d",
1827                                                 f->f_un.f_forw.f_hname, port);
1828                                 } else {
1829                                         printf("%s", f->f_un.f_forw.f_hname);
1830                                 }
1831                                 break;
1832
1833                         case F_PIPE:
1834                                 printf("%s", f->f_un.f_pipe.f_pname);
1835                                 break;
1836
1837                         case F_USERS:
1838                                 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1839                                         printf("%s, ", f->f_un.f_uname[i]);
1840                                 break;
1841                         }
1842                         if (f->f_program)
1843                                 printf(" (%s)", f->f_program);
1844                         printf("\n");
1845                 }
1846         }
1847
1848         logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1849         dprintf("syslogd: restarted\n");
1850         /*
1851          * Log a change in hostname, but only on a restart.
1852          */
1853         if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1854                 (void)snprintf(hostMsg, sizeof(hostMsg),
1855                     "syslogd: hostname changed, \"%s\" to \"%s\"",
1856                     oldLocalHostName, LocalHostName);
1857                 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1858                 dprintf("%s\n", hostMsg);
1859         }
1860         /*
1861          * Log the kernel boot file if we aren't going to use it as
1862          * the prefix, and if this is *not* a restart.
1863          */
1864         if (signo == 0 && !use_bootfile) {
1865                 (void)snprintf(bootfileMsg, sizeof(bootfileMsg),
1866                     "syslogd: kernel boot file is %s", bootfile);
1867                 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1868                 dprintf("%s\n", bootfileMsg);
1869         }
1870 }
1871
1872 /*
1873  * Crack a configuration file line
1874  */
1875 static void
1876 cfline(const char *line, struct filed *f, const char *prog, const char *host)
1877 {
1878         struct addrinfo hints, *res;
1879         int error, i, pri, syncfile;
1880         const char *p, *q;
1881         char *bp;
1882         char buf[MAXLINE], ebuf[100];
1883
1884         dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1885
1886         errno = 0;      /* keep strerror() stuff out of logerror messages */
1887
1888         /* clear out file entry */
1889         memset(f, 0, sizeof(*f));
1890         for (i = 0; i <= LOG_NFACILITIES; i++)
1891                 f->f_pmask[i] = INTERNAL_NOPRI;
1892
1893         /* save hostname if any */
1894         if (host && *host == '*')
1895                 host = NULL;
1896         if (host) {
1897                 int hl;
1898
1899                 f->f_host = strdup(host);
1900                 if (f->f_host == NULL) {
1901                         logerror("strdup");
1902                         exit(1);
1903                 }
1904                 hl = strlen(f->f_host);
1905                 if (hl > 0 && f->f_host[hl-1] == '.')
1906                         f->f_host[--hl] = '\0';
1907                 trimdomain(f->f_host, hl);
1908         }
1909
1910         /* save program name if any */
1911         if (prog && *prog == '*')
1912                 prog = NULL;
1913         if (prog) {
1914                 f->f_program = strdup(prog);
1915                 if (f->f_program == NULL) {
1916                         logerror("strdup");
1917                         exit(1);
1918                 }
1919         }
1920
1921         /* scan through the list of selectors */
1922         for (p = line; *p && *p != '\t' && *p != ' ';) {
1923                 int pri_done;
1924                 int pri_cmp;
1925                 int pri_invert;
1926
1927                 /* find the end of this facility name list */
1928                 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1929                         continue;
1930
1931                 /* get the priority comparison */
1932                 pri_cmp = 0;
1933                 pri_done = 0;
1934                 pri_invert = 0;
1935                 if (*q == '!') {
1936                         pri_invert = 1;
1937                         q++;
1938                 }
1939                 while (!pri_done) {
1940                         switch (*q) {
1941                         case '<':
1942                                 pri_cmp |= PRI_LT;
1943                                 q++;
1944                                 break;
1945                         case '=':
1946                                 pri_cmp |= PRI_EQ;
1947                                 q++;
1948                                 break;
1949                         case '>':
1950                                 pri_cmp |= PRI_GT;
1951                                 q++;
1952                                 break;
1953                         default:
1954                                 pri_done++;
1955                                 break;
1956                         }
1957                 }
1958
1959                 /* collect priority name */
1960                 for (bp = buf; *q && !strchr("\t,; ", *q); )
1961                         *bp++ = *q++;
1962                 *bp = '\0';
1963
1964                 /* skip cruft */
1965                 while (strchr(",;", *q))
1966                         q++;
1967
1968                 /* decode priority name */
1969                 if (*buf == '*') {
1970                         pri = LOG_PRIMASK;
1971                         pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1972                 } else {
1973                         /* Ignore trailing spaces. */
1974                         for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1975                                 buf[i] = '\0';
1976
1977                         pri = decode(buf, prioritynames);
1978                         if (pri < 0) {
1979                                 errno = 0;
1980                                 (void)snprintf(ebuf, sizeof ebuf,
1981                                     "unknown priority name \"%s\"", buf);
1982                                 logerror(ebuf);
1983                                 return;
1984                         }
1985                 }
1986                 if (!pri_cmp)
1987                         pri_cmp = (UniquePriority)
1988                                   ? (PRI_EQ)
1989                                   : (PRI_EQ | PRI_GT)
1990                                   ;
1991                 if (pri_invert)
1992                         pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1993
1994                 /* scan facilities */
1995                 while (*p && !strchr("\t.; ", *p)) {
1996                         for (bp = buf; *p && !strchr("\t,;. ", *p); )
1997                                 *bp++ = *p++;
1998                         *bp = '\0';
1999
2000                         if (*buf == '*') {
2001                                 for (i = 0; i < LOG_NFACILITIES; i++) {
2002                                         f->f_pmask[i] = pri;
2003                                         f->f_pcmp[i] = pri_cmp;
2004                                 }
2005                         } else {
2006                                 i = decode(buf, facilitynames);
2007                                 if (i < 0) {
2008                                         errno = 0;
2009                                         (void)snprintf(ebuf, sizeof ebuf,
2010                                             "unknown facility name \"%s\"",
2011                                             buf);
2012                                         logerror(ebuf);
2013                                         return;
2014                                 }
2015                                 f->f_pmask[i >> 3] = pri;
2016                                 f->f_pcmp[i >> 3] = pri_cmp;
2017                         }
2018                         while (*p == ',' || *p == ' ')
2019                                 p++;
2020                 }
2021
2022                 p = q;
2023         }
2024
2025         /* skip to action part */
2026         while (*p == '\t' || *p == ' ')
2027                 p++;
2028
2029         if (*p == '-') {
2030                 syncfile = 0;
2031                 p++;
2032         } else
2033                 syncfile = 1;
2034
2035         switch (*p) {
2036         case '@':
2037                 {
2038                         char *tp;
2039                         char endkey = ':';
2040                         /*
2041                          * scan forward to see if there is a port defined.
2042                          * so we can't use strlcpy..
2043                          */
2044                         i = sizeof(f->f_un.f_forw.f_hname);
2045                         tp = f->f_un.f_forw.f_hname;
2046                         p++;
2047
2048                         /*
2049                          * an ipv6 address should start with a '[' in that case
2050                          * we should scan for a ']'
2051                          */
2052                         if (*p == '[') {
2053                                 p++;
2054                                 endkey = ']';
2055                         }
2056                         while (*p && (*p != endkey) && (i-- > 0)) {
2057                                 *tp++ = *p++;
2058                         }
2059                         if (endkey == ']' && *p == endkey)
2060                                 p++;
2061                         *tp = '\0';
2062                 }
2063                 /* See if we copied a domain and have a port */
2064                 if (*p == ':')
2065                         p++;
2066                 else
2067                         p = NULL;
2068
2069                 memset(&hints, 0, sizeof(hints));
2070                 hints.ai_family = family;
2071                 hints.ai_socktype = SOCK_DGRAM;
2072                 error = getaddrinfo(f->f_un.f_forw.f_hname,
2073                                 p ? p : "syslog", &hints, &res);
2074                 if (error) {
2075                         logerror(gai_strerror(error));
2076                         break;
2077                 }
2078                 f->f_un.f_forw.f_addr = res;
2079                 f->f_type = F_FORW;
2080                 break;
2081
2082         case '/':
2083                 if ((f->f_file = open(p, logflags, 0600)) < 0) {
2084                         f->f_type = F_UNUSED;
2085                         logerror(p);
2086                         break;
2087                 }
2088                 if (syncfile)
2089                         f->f_flags |= FFLAG_SYNC;
2090                 if (isatty(f->f_file)) {
2091                         if (strcmp(p, ctty) == 0)
2092                                 f->f_type = F_CONSOLE;
2093                         else
2094                                 f->f_type = F_TTY;
2095                         (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
2096                             sizeof(f->f_un.f_fname));
2097                 } else {
2098                         (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
2099                         f->f_type = F_FILE;
2100                 }
2101                 break;
2102
2103         case '|':
2104                 f->f_un.f_pipe.f_pid = 0;
2105                 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1,
2106                     sizeof(f->f_un.f_pipe.f_pname));
2107                 f->f_type = F_PIPE;
2108                 break;
2109
2110         case '*':
2111                 f->f_type = F_WALL;
2112                 break;
2113
2114         default:
2115                 for (i = 0; i < MAXUNAMES && *p; i++) {
2116                         for (q = p; *q && *q != ','; )
2117                                 q++;
2118                         (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1);
2119                         if ((q - p) >= MAXLOGNAME)
2120                                 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0';
2121                         else
2122                                 f->f_un.f_uname[i][q - p] = '\0';
2123                         while (*q == ',' || *q == ' ')
2124                                 q++;
2125                         p = q;
2126                 }
2127                 f->f_type = F_USERS;
2128                 break;
2129         }
2130 }
2131
2132
2133 /*
2134  *  Decode a symbolic name to a numeric value
2135  */
2136 static int
2137 decode(const char *name, const CODE *codetab)
2138 {
2139         const CODE *c;
2140         char *p, buf[40];
2141
2142         if (isdigit(*name))
2143                 return (atoi(name));
2144
2145         for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2146                 if (isupper(*name))
2147                         *p = tolower(*name);
2148                 else
2149                         *p = *name;
2150         }
2151         *p = '\0';
2152         for (c = codetab; c->c_name; c++)
2153                 if (!strcmp(buf, c->c_name))
2154                         return (c->c_val);
2155
2156         return (-1);
2157 }
2158
2159 static void
2160 markit(void)
2161 {
2162         struct filed *f;
2163         dq_t q, next;
2164
2165         now = time((time_t *)NULL);
2166         MarkSeq += TIMERINTVL;
2167         if (MarkSeq >= MarkInterval) {
2168                 logmsg(LOG_INFO, "-- MARK --",
2169                     LocalHostName, ADDDATE|MARK);
2170                 MarkSeq = 0;
2171         }
2172
2173         for (f = Files; f; f = f->f_next) {
2174                 if (f->f_prevcount && now >= REPEATTIME(f)) {
2175                         dprintf("flush %s: repeated %d times, %d sec.\n",
2176                             TypeNames[f->f_type], f->f_prevcount,
2177                             repeatinterval[f->f_repeatcount]);
2178                         fprintlog(f, 0, (char *)NULL);
2179                         BACKOFF(f);
2180                 }
2181         }
2182
2183         /* Walk the dead queue, and see if we should signal somebody. */
2184         for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2185                 next = TAILQ_NEXT(q, dq_entries);
2186
2187                 switch (q->dq_timeout) {
2188                 case 0:
2189                         /* Already signalled once, try harder now. */
2190                         if (kill(q->dq_pid, SIGKILL) != 0)
2191                                 (void)deadq_remove(q->dq_pid);
2192                         break;
2193
2194                 case 1:
2195                         /*
2196                          * Timed out on dead queue, send terminate
2197                          * signal.  Note that we leave the removal
2198                          * from the dead queue to reapchild(), which
2199                          * will also log the event (unless the process
2200                          * didn't even really exist, in case we simply
2201                          * drop it from the dead queue).
2202                          */
2203                         if (kill(q->dq_pid, SIGTERM) != 0)
2204                                 (void)deadq_remove(q->dq_pid);
2205                         /* FALLTHROUGH */
2206
2207                 default:
2208                         q->dq_timeout--;
2209                 }
2210         }
2211         MarkSet = 0;
2212         (void)alarm(TIMERINTVL);
2213 }
2214
2215 /*
2216  * fork off and become a daemon, but wait for the child to come online
2217  * before returning to the parent, or we get disk thrashing at boot etc.
2218  * Set a timer so we don't hang forever if it wedges.
2219  */
2220 static int
2221 waitdaemon(int nochdir, int noclose, int maxwait)
2222 {
2223         int fd;
2224         int status;
2225         pid_t pid, childpid;
2226
2227         switch (childpid = fork()) {
2228         case -1:
2229                 return (-1);
2230         case 0:
2231                 break;
2232         default:
2233                 signal(SIGALRM, timedout);
2234                 alarm(maxwait);
2235                 while ((pid = wait3(&status, 0, NULL)) != -1) {
2236                         if (WIFEXITED(status))
2237                                 errx(1, "child pid %d exited with return code %d",
2238                                         pid, WEXITSTATUS(status));
2239                         if (WIFSIGNALED(status))
2240                                 errx(1, "child pid %d exited on signal %d%s",
2241                                         pid, WTERMSIG(status),
2242                                         WCOREDUMP(status) ? " (core dumped)" :
2243                                         "");
2244                         if (pid == childpid)    /* it's gone... */
2245                                 break;
2246                 }
2247                 exit(0);
2248         }
2249
2250         if (setsid() == -1)
2251                 return (-1);
2252
2253         if (!nochdir)
2254                 (void)chdir("/");
2255
2256         if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2257                 (void)dup2(fd, STDIN_FILENO);
2258                 (void)dup2(fd, STDOUT_FILENO);
2259                 (void)dup2(fd, STDERR_FILENO);
2260                 if (fd > 2)
2261                         (void)close (fd);
2262         }
2263         return (getppid());
2264 }
2265
2266 /*
2267  * We get a SIGALRM from the child when it's running and finished doing it's
2268  * fsync()'s or O_SYNC writes for all the boot messages.
2269  *
2270  * We also get a signal from the kernel if the timer expires, so check to
2271  * see what happened.
2272  */
2273 static void
2274 timedout(int sig __unused)
2275 {
2276         int left;
2277         left = alarm(0);
2278         signal(SIGALRM, SIG_DFL);
2279         if (left == 0)
2280                 errx(1, "timed out waiting for child");
2281         else
2282                 _exit(0);
2283 }
2284
2285 /*
2286  * Add `s' to the list of allowable peer addresses to accept messages
2287  * from.
2288  *
2289  * `s' is a string in the form:
2290  *
2291  *    [*]domainname[:{servicename|portnumber|*}]
2292  *
2293  * or
2294  *
2295  *    netaddr/maskbits[:{servicename|portnumber|*}]
2296  *
2297  * Returns -1 on error, 0 if the argument was valid.
2298  */
2299 static int
2300 allowaddr(char *s)
2301 {
2302         char *cp1, *cp2;
2303         struct allowedpeer ap;
2304         struct servent *se;
2305         int masklen = -1;
2306         struct addrinfo hints, *res;
2307         struct in_addr *addrp, *maskp;
2308 #ifdef INET6
2309         int i;
2310         u_int32_t *addr6p, *mask6p;
2311 #endif
2312         char ip[NI_MAXHOST];
2313
2314 #ifdef INET6
2315         if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2316 #endif
2317                 cp1 = s;
2318         if ((cp1 = strrchr(cp1, ':'))) {
2319                 /* service/port provided */
2320                 *cp1++ = '\0';
2321                 if (strlen(cp1) == 1 && *cp1 == '*')
2322                         /* any port allowed */
2323                         ap.port = 0;
2324                 else if ((se = getservbyname(cp1, "udp"))) {
2325                         ap.port = ntohs(se->s_port);
2326                 } else {
2327                         ap.port = strtol(cp1, &cp2, 0);
2328                         if (*cp2 != '\0')
2329                                 return (-1); /* port not numeric */
2330                 }
2331         } else {
2332                 if ((se = getservbyname("syslog", "udp")))
2333                         ap.port = ntohs(se->s_port);
2334                 else
2335                         /* sanity, should not happen */
2336                         ap.port = 514;
2337         }
2338
2339         if ((cp1 = strchr(s, '/')) != NULL &&
2340             strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2341                 *cp1 = '\0';
2342                 if ((masklen = atoi(cp1 + 1)) < 0)
2343                         return (-1);
2344         }
2345 #ifdef INET6
2346         if (*s == '[') {
2347                 cp2 = s + strlen(s) - 1;
2348                 if (*cp2 == ']') {
2349                         ++s;
2350                         *cp2 = '\0';
2351                 } else {
2352                         cp2 = NULL;
2353                 }
2354         } else {
2355                 cp2 = NULL;
2356         }
2357 #endif
2358         memset(&hints, 0, sizeof(hints));
2359         hints.ai_family = PF_UNSPEC;
2360         hints.ai_socktype = SOCK_DGRAM;
2361         hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2362         if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2363                 ap.isnumeric = 1;
2364                 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2365                 memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2366                 ap.a_mask.ss_family = res->ai_family;
2367                 if (res->ai_family == AF_INET) {
2368                         ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2369                         maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2370                         addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2371                         if (masklen < 0) {
2372                                 /* use default netmask */
2373                                 if (IN_CLASSA(ntohl(addrp->s_addr)))
2374                                         maskp->s_addr = htonl(IN_CLASSA_NET);
2375                                 else if (IN_CLASSB(ntohl(addrp->s_addr)))
2376                                         maskp->s_addr = htonl(IN_CLASSB_NET);
2377                                 else
2378                                         maskp->s_addr = htonl(IN_CLASSC_NET);
2379                         } else if (masklen <= 32) {
2380                                 /* convert masklen to netmask */
2381                                 if (masklen == 0)
2382                                         maskp->s_addr = 0;
2383                                 else
2384                                         maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2385                         } else {
2386                                 freeaddrinfo(res);
2387                                 return (-1);
2388                         }
2389                         /* Lose any host bits in the network number. */
2390                         addrp->s_addr &= maskp->s_addr;
2391                 }
2392 #ifdef INET6
2393                 else if (res->ai_family == AF_INET6 && masklen <= 128) {
2394                         ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2395                         if (masklen < 0)
2396                                 masklen = 128;
2397                         mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2398                         /* convert masklen to netmask */
2399                         while (masklen > 0) {
2400                                 if (masklen < 32) {
2401                                         *mask6p = htonl(~(0xffffffff >> masklen));
2402                                         break;
2403                                 }
2404                                 *mask6p++ = 0xffffffff;
2405                                 masklen -= 32;
2406                         }
2407                         /* Lose any host bits in the network number. */
2408                         mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2409                         addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2410                         for (i = 0; i < 4; i++)
2411                                 addr6p[i] &= mask6p[i];
2412                 }
2413 #endif
2414                 else {
2415                         freeaddrinfo(res);
2416                         return (-1);
2417                 }
2418                 freeaddrinfo(res);
2419         } else {
2420                 /* arg `s' is domain name */
2421                 ap.isnumeric = 0;
2422                 ap.a_name = s;
2423                 if (cp1)
2424                         *cp1 = '/';
2425 #ifdef INET6
2426                 if (cp2) {
2427                         *cp2 = ']';
2428                         --s;
2429                 }
2430 #endif
2431         }
2432
2433         if (Debug) {
2434                 printf("allowaddr: rule %d: ", NumAllowed);
2435                 if (ap.isnumeric) {
2436                         printf("numeric, ");
2437                         getnameinfo((struct sockaddr *)&ap.a_addr,
2438                                     ((struct sockaddr *)&ap.a_addr)->sa_len,
2439                                     ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2440                         printf("addr = %s, ", ip);
2441                         getnameinfo((struct sockaddr *)&ap.a_mask,
2442                                     ((struct sockaddr *)&ap.a_mask)->sa_len,
2443                                     ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2444                         printf("mask = %s; ", ip);
2445                 } else {
2446                         printf("domainname = %s; ", ap.a_name);
2447                 }
2448                 printf("port = %d\n", ap.port);
2449         }
2450
2451         if ((AllowedPeers = realloc(AllowedPeers,
2452                                     ++NumAllowed * sizeof(struct allowedpeer)))
2453             == NULL) {
2454                 logerror("realloc");
2455                 exit(1);
2456         }
2457         memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2458         return (0);
2459 }
2460
2461 /*
2462  * Validate that the remote peer has permission to log to us.
2463  */
2464 static int
2465 validate(struct sockaddr *sa, const char *hname)
2466 {
2467         int i;
2468         size_t l1, l2;
2469         char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2470         struct allowedpeer *ap;
2471         struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2472 #ifdef INET6
2473         int j, reject;
2474         struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2475 #endif
2476         struct addrinfo hints, *res;
2477         u_short sport;
2478
2479         if (NumAllowed == 0)
2480                 /* traditional behaviour, allow everything */
2481                 return (1);
2482
2483         (void)strlcpy(name, hname, sizeof(name));
2484         memset(&hints, 0, sizeof(hints));
2485         hints.ai_family = PF_UNSPEC;
2486         hints.ai_socktype = SOCK_DGRAM;
2487         hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2488         if (getaddrinfo(name, NULL, &hints, &res) == 0)
2489                 freeaddrinfo(res);
2490         else if (strchr(name, '.') == NULL) {
2491                 strlcat(name, ".", sizeof name);
2492                 strlcat(name, LocalDomain, sizeof name);
2493         }
2494         if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2495                         NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2496                 return (0);     /* for safety, should not occur */
2497         dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2498                 ip, port, name);
2499         sport = atoi(port);
2500
2501         /* now, walk down the list */
2502         for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2503                 if (ap->port != 0 && ap->port != sport) {
2504                         dprintf("rejected in rule %d due to port mismatch.\n", i);
2505                         continue;
2506                 }
2507
2508                 if (ap->isnumeric) {
2509                         if (ap->a_addr.ss_family != sa->sa_family) {
2510                                 dprintf("rejected in rule %d due to address family mismatch.\n", i);
2511                                 continue;
2512                         }
2513                         if (ap->a_addr.ss_family == AF_INET) {
2514                                 sin4 = (struct sockaddr_in *)sa;
2515                                 a4p = (struct sockaddr_in *)&ap->a_addr;
2516                                 m4p = (struct sockaddr_in *)&ap->a_mask;
2517                                 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2518                                     != a4p->sin_addr.s_addr) {
2519                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
2520                                         continue;
2521                                 }
2522                         }
2523 #ifdef INET6
2524                         else if (ap->a_addr.ss_family == AF_INET6) {
2525                                 sin6 = (struct sockaddr_in6 *)sa;
2526                                 a6p = (struct sockaddr_in6 *)&ap->a_addr;
2527                                 m6p = (struct sockaddr_in6 *)&ap->a_mask;
2528                                 if (a6p->sin6_scope_id != 0 &&
2529                                     sin6->sin6_scope_id != a6p->sin6_scope_id) {
2530                                         dprintf("rejected in rule %d due to scope mismatch.\n", i);
2531                                         continue;
2532                                 }
2533                                 reject = 0;
2534                                 for (j = 0; j < 16; j += 4) {
2535                                         if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2536                                             != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2537                                                 ++reject;
2538                                                 break;
2539                                         }
2540                                 }
2541                                 if (reject) {
2542                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
2543                                         continue;
2544                                 }
2545                         }
2546 #endif
2547                         else
2548                                 continue;
2549                 } else {
2550                         cp = ap->a_name;
2551                         l1 = strlen(name);
2552                         if (*cp == '*') {
2553                                 /* allow wildmatch */
2554                                 cp++;
2555                                 l2 = strlen(cp);
2556                                 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2557                                         dprintf("rejected in rule %d due to name mismatch.\n", i);
2558                                         continue;
2559                                 }
2560                         } else {
2561                                 /* exact match */
2562                                 l2 = strlen(cp);
2563                                 if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2564                                         dprintf("rejected in rule %d due to name mismatch.\n", i);
2565                                         continue;
2566                                 }
2567                         }
2568                 }
2569                 dprintf("accepted in rule %d.\n", i);
2570                 return (1);     /* hooray! */
2571         }
2572         return (0);
2573 }
2574
2575 /*
2576  * Fairly similar to popen(3), but returns an open descriptor, as
2577  * opposed to a FILE *.
2578  */
2579 static int
2580 p_open(const char *prog, pid_t *rpid)
2581 {
2582         int pfd[2], nulldesc;
2583         pid_t pid;
2584         sigset_t omask, mask;
2585         char *argv[4]; /* sh -c cmd NULL */
2586         char errmsg[200];
2587
2588         if (pipe(pfd) == -1)
2589                 return (-1);
2590         if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2591                 /* we are royally screwed anyway */
2592                 return (-1);
2593
2594         sigemptyset(&mask);
2595         sigaddset(&mask, SIGALRM);
2596         sigaddset(&mask, SIGHUP);
2597         sigprocmask(SIG_BLOCK, &mask, &omask);
2598         switch ((pid = fork())) {
2599         case -1:
2600                 sigprocmask(SIG_SETMASK, &omask, 0);
2601                 close(nulldesc);
2602                 return (-1);
2603
2604         case 0:
2605                 argv[0] = strdup("sh");
2606                 argv[1] = strdup("-c");
2607                 argv[2] = strdup(prog);
2608                 argv[3] = NULL;
2609                 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2610                         logerror("strdup");
2611                         exit(1);
2612                 }
2613
2614                 alarm(0);
2615                 (void)setsid(); /* Avoid catching SIGHUPs. */
2616
2617                 /*
2618                  * Throw away pending signals, and reset signal
2619                  * behaviour to standard values.
2620                  */
2621                 signal(SIGALRM, SIG_IGN);
2622                 signal(SIGHUP, SIG_IGN);
2623                 sigprocmask(SIG_SETMASK, &omask, 0);
2624                 signal(SIGPIPE, SIG_DFL);
2625                 signal(SIGQUIT, SIG_DFL);
2626                 signal(SIGALRM, SIG_DFL);
2627                 signal(SIGHUP, SIG_DFL);
2628
2629                 dup2(pfd[0], STDIN_FILENO);
2630                 dup2(nulldesc, STDOUT_FILENO);
2631                 dup2(nulldesc, STDERR_FILENO);
2632                 closefrom(3);
2633
2634                 (void)execvp(_PATH_BSHELL, argv);
2635                 _exit(255);
2636         }
2637
2638         sigprocmask(SIG_SETMASK, &omask, 0);
2639         close(nulldesc);
2640         close(pfd[0]);
2641         /*
2642          * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
2643          * supposed to get an EWOULDBLOCK on writev(2), which is
2644          * caught by the logic above anyway, which will in turn close
2645          * the pipe, and fork a new logging subprocess if necessary.
2646          * The stale subprocess will be killed some time later unless
2647          * it terminated itself due to closing its input pipe (so we
2648          * get rid of really dead puppies).
2649          */
2650         if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2651                 /* This is bad. */
2652                 (void)snprintf(errmsg, sizeof errmsg,
2653                                "Warning: cannot change pipe to PID %d to "
2654                                "non-blocking behaviour.",
2655                                (int)pid);
2656                 logerror(errmsg);
2657         }
2658         *rpid = pid;
2659         return (pfd[1]);
2660 }
2661
2662 static void
2663 deadq_enter(pid_t pid, const char *name)
2664 {
2665         dq_t p;
2666         int status;
2667
2668         if (pid == 0)
2669                 return;
2670         /*
2671          * Be paranoid, if we can't signal the process, don't enter it
2672          * into the dead queue (perhaps it's already dead).  If possible,
2673          * we try to fetch and log the child's status.
2674          */
2675         if (kill(pid, 0) != 0) {
2676                 if (waitpid(pid, &status, WNOHANG) > 0)
2677                         log_deadchild(pid, status, name);
2678                 return;
2679         }
2680
2681         p = malloc(sizeof(struct deadq_entry));
2682         if (p == NULL) {
2683                 logerror("malloc");
2684                 exit(1);
2685         }
2686
2687         p->dq_pid = pid;
2688         p->dq_timeout = DQ_TIMO_INIT;
2689         TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2690 }
2691
2692 static int
2693 deadq_remove(pid_t pid)
2694 {
2695         dq_t q;
2696
2697         TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2698                 if (q->dq_pid == pid) {
2699                         TAILQ_REMOVE(&deadq_head, q, dq_entries);
2700                                 free(q);
2701                                 return (1);
2702                 }
2703         }
2704
2705         return (0);
2706 }
2707
2708 static void
2709 log_deadchild(pid_t pid, int status, const char *name)
2710 {
2711         int code;
2712         char buf[256];
2713         const char *reason;
2714
2715         errno = 0; /* Keep strerror() stuff out of logerror messages. */
2716         if (WIFSIGNALED(status)) {
2717                 reason = "due to signal";
2718                 code = WTERMSIG(status);
2719         } else {
2720                 reason = "with status";
2721                 code = WEXITSTATUS(status);
2722                 if (code == 0)
2723                         return;
2724         }
2725         (void)snprintf(buf, sizeof buf,
2726                        "Logging subprocess %d (%s) exited %s %d.",
2727                        pid, name, reason, code);
2728         logerror(buf);
2729 }
2730
2731 static int *
2732 socksetup(int af, char *bindhostname)
2733 {
2734         struct addrinfo hints, *res, *r;
2735         const char *bindservice;
2736         char *cp;
2737         int error, maxs, *s, *socks;
2738
2739         /*
2740          * We have to handle this case for backwards compatibility:
2741          * If there are two (or more) colons but no '[' and ']',
2742          * assume this is an inet6 address without a service.
2743          */
2744         bindservice = "syslog";
2745         if (bindhostname != NULL) {
2746 #ifdef INET6
2747                 if (*bindhostname == '[' &&
2748                     (cp = strchr(bindhostname + 1, ']')) != NULL) {
2749                         ++bindhostname;
2750                         *cp = '\0';
2751                         if (cp[1] == ':' && cp[2] != '\0')
2752                                 bindservice = cp + 2;
2753                 } else {
2754 #endif
2755                         cp = strchr(bindhostname, ':');
2756                         if (cp != NULL && strchr(cp + 1, ':') == NULL) {
2757                                 *cp = '\0';
2758                                 if (cp[1] != '\0')
2759                                         bindservice = cp + 1;
2760                                 if (cp == bindhostname)
2761                                         bindhostname = NULL;
2762                         }
2763 #ifdef INET6
2764                 }
2765 #endif
2766         }
2767
2768         memset(&hints, 0, sizeof(hints));
2769         hints.ai_flags = AI_PASSIVE;
2770         hints.ai_family = af;
2771         hints.ai_socktype = SOCK_DGRAM;
2772         error = getaddrinfo(bindhostname, bindservice, &hints, &res);
2773         if (error) {
2774                 logerror(gai_strerror(error));
2775                 errno = 0;
2776                 die(0);
2777         }
2778
2779         /* Count max number of sockets we may open */
2780         for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2781         socks = malloc((maxs+1) * sizeof(int));
2782         if (socks == NULL) {
2783                 logerror("couldn't allocate memory for sockets");
2784                 die(0);
2785         }
2786
2787         *socks = 0;   /* num of sockets counter at start of array */
2788         s = socks + 1;
2789         for (r = res; r; r = r->ai_next) {
2790                 int on = 1;
2791                 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2792                 if (*s < 0) {
2793                         logerror("socket");
2794                         continue;
2795                 }
2796 #ifdef INET6
2797                 if (r->ai_family == AF_INET6) {
2798                         if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2799                                        (char *)&on, sizeof (on)) < 0) {
2800                                 logerror("setsockopt");
2801                                 close(*s);
2802                                 continue;
2803                         }
2804                 }
2805 #endif
2806                 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2807                                (char *)&on, sizeof (on)) < 0) {
2808                         logerror("setsockopt");
2809                         close(*s);
2810                         continue;
2811                 }
2812                 /*
2813                  * RFC 3164 recommends that client side message
2814                  * should come from the privileged syslogd port.
2815                  *
2816                  * If the system administrator choose not to obey
2817                  * this, we can skip the bind() step so that the
2818                  * system will choose a port for us.
2819                  */
2820                 if (!NoBind) {
2821                         if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2822                                 logerror("bind");
2823                                 close(*s);
2824                                 continue;
2825                         }
2826
2827                         if (!SecureMode)
2828                                 increase_rcvbuf(*s);
2829                 }
2830
2831                 (*socks)++;
2832                 s++;
2833         }
2834
2835         if (*socks == 0) {
2836                 free(socks);
2837                 if (Debug)
2838                         return (NULL);
2839                 else
2840                         die(0);
2841         }
2842         if (res)
2843                 freeaddrinfo(res);
2844
2845         return (socks);
2846 }
2847
2848 static void
2849 increase_rcvbuf(int fd)
2850 {
2851         socklen_t len, slen;
2852
2853         slen = sizeof(len);
2854
2855         if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2856                 if (len < RCVBUF_MINSIZE) {
2857                         len = RCVBUF_MINSIZE;
2858                         setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len));
2859                 }
2860         }
2861 }