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