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  * @(#)syslogd.c        8.3 (Berkeley) 4/4/94
  30  * $FreeBSD: src/usr.sbin/syslogd/syslogd.c,v 1.163 2008/12/19 18:27:51 delphij Exp $
  31  * $DragonFly: src/usr.sbin/syslogd/syslogd.c,v 1.6 2007/08/09 02:17:46 dillon Exp $
  32  */
  33
  34 /*
  35  *  syslogd -- log system messages
  36  *
  37  * This program implements a system log. It takes a series of lines.
  38  * Each line may have a priority, signified as "<n>" as
  39  * the first characters of the line.  If this is
  40  * not present, a default priority is used.
  41  *
  42  * To kill syslogd, send a signal 15 (terminate).  A signal 1 (hup) will
  43  * cause it to reread its configuration file.
  44  *
  45  * Defined Constants:
  46  *
  47  * MAXLINE -- the maximum line length that can be handled.
  48  * DEFUPRI -- the default priority for user messages
  49  * DEFSPRI -- the default priority for kernel messages
  50  *
  51  * Author: Eric Allman
  52  * extensive changes by Ralph Campbell
  53  * more extensive changes by Eric Allman (again)
  54  * Extension to log by program name as well as facility and priority
  55  *   by Peter da Silva.
  56  * -u and -v by Harlan Stenn.
  57  * Priority comparison code by Harlan Stenn.
  58  * Ring buffer code by Jeff Wheelhouse.
  59  */
  60
  61 #define MAXLINE         1024            /* maximum line length */
  62 #define MAXSVLINE       120             /* maximum saved line length */
  63 #define DEFUPRI         (LOG_USER|LOG_NOTICE)
  64 #define DEFSPRI         (LOG_KERN|LOG_CRIT)
  65 #define TIMERINTVL      30              /* interval for checking flush, mark */
  66 #define TTYMSGTIME      1               /* timeout passed to ttymsg */
  67
  68 #include <sys/param.h>
  69 #include <sys/ioctl.h>
  70 #include <sys/stat.h>
  71 #include <sys/wait.h>
  72 #include <sys/socket.h>
  73 #include <sys/queue.h>
  74 #include <sys/uio.h>
  75 #include <sys/un.h>
  76 #include <sys/time.h>
  77 #include <sys/resource.h>
  78 #include <sys/syslimits.h>
  79 #include <sys/mman.h>
  80 #include <sys/types.h>
  81
  82 #include <netinet/in.h>
  83 #include <netdb.h>
  84 #include <arpa/inet.h>
  85
  86 #include <ctype.h>
  87 #include <err.h>
  88 #include <errno.h>
  89 #include <fcntl.h>
  90 #include <libutil.h>
  91 #include <limits.h>
  92 #include <paths.h>
  93 #include <signal.h>
  94 #include <stdio.h>
  95 #include <stdlib.h>
  96 #include <string.h>
  97 #include <sysexits.h>
  98 #include <unistd.h>
  99 #include <utmp.h>
 100
 101 #include "pathnames.h"
 102 #include "ttymsg.h"
 103 #include "../clog/clog.h"
 104 #include "../nscd/pidfile.h"
 105
 106 #define SYSLOG_NAMES
 107 #include <sys/syslog.h>
 108
 109 const char      *ConfFile = _PATH_LOGCONF;
 110 const char      *PidFile = _PATH_LOGPID;
 111 const char      ctty[] = _PATH_CONSOLE;
 112 const char      ring_magic[] = "CLOG";
 113
 114 #define dprintf         if (Debug) printf
 115
 116 #define MAXUNAMES       20      /* maximum number of user names */
 117
 118 /*
 119  * Unix sockets.
 120  * We have two default sockets, one with 666 permissions,
 121  * and one for privileged programs.
 122  */
 123 struct funix {
 124         int                     s;
 125         const char              *name;
 126         mode_t                  mode;
 127         STAILQ_ENTRY(funix)     next;
 128 };
 129 struct funix funix_secure =     { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR,
 130                                 { NULL } };
 131 struct funix funix_default =    { -1, _PATH_LOG, DEFFILEMODE,
 132                                 { &funix_secure } };
 133
 134 STAILQ_HEAD(, funix) funixes =  { &funix_default,
 135                                 &(funix_secure.next.stqe_next) };
 136
 137 /*
 138  * Flags to logmsg().
 139  */
 140
 141 #define IGN_CONS        0x001   /* don't print on console */
 142 #define SYNC_FILE       0x002   /* do fsync on file after printing */
 143 #define ADDDATE         0x004   /* add a date to the message */
 144 #define MARK            0x008   /* this message is a mark */
 145 #define ISKERNEL        0x010   /* kernel generated message */
 146
 147 /*
 148  * This structure represents the files that will have log
 149  * copies printed.
 150  * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
 151  * or if f_type if F_PIPE and f_pid > 0.
 152  */
 153
 154 struct filed {
 155         struct  filed *f_next;          /* next in linked list */
 156         short   f_type;                 /* entry type, see below */
 157         short   f_file;                 /* file descriptor */
 158         time_t  f_time;                 /* time this was last written */
 159         char    *f_host;                /* host from which to recd. */
 160         u_char  f_pmask[LOG_NFACILITIES+1];     /* priority mask */
 161         u_char  f_pcmp[LOG_NFACILITIES+1];      /* compare priority */
 162 #define PRI_LT  0x1
 163 #define PRI_EQ  0x2
 164 #define PRI_GT  0x4
 165         char    *f_program;             /* program this applies to */
 166         union {
 167                 char    f_uname[MAXUNAMES][UT_NAMESIZE+1];
 168                 struct {
 169                         char    f_hname[MAXHOSTNAMELEN];
 170                         struct addrinfo *f_addr;
 171
 172                 } f_forw;               /* forwarding address */
 173                 char    f_fname[MAXPATHLEN];
 174                 struct {
 175                         char    f_pname[MAXPATHLEN];
 176                         pid_t   f_pid;
 177                 } f_pipe;
 178                 struct {
 179                         char    f_rname[MAXPATHLEN];
 180                         struct clog_footer *f_footer;
 181                         size_t  f_size;
 182                 } f_ring;
 183         } f_un;
 184         char    f_prevline[MAXSVLINE];          /* last message logged */
 185         char    f_lasttime[16];                 /* time of last occurrence */
 186         char    f_prevhost[MAXHOSTNAMELEN];     /* host from which recd. */
 187         int     f_prevpri;                      /* pri of f_prevline */
 188         int     f_prevlen;                      /* length of f_prevline */
 189         int     f_prevcount;                    /* repetition cnt of prevline */
 190         u_int   f_repeatcount;                  /* number of "repeated" msgs */
 191         int     f_flags;                        /* file-specific flags */
 192 #define FFLAG_SYNC 0x01
 193 #define FFLAG_NEEDSYNC  0x02
 194 };
 195
 196 /*
 197  * Queue of about-to-be dead processes we should watch out for.
 198  */
 199
 200 TAILQ_HEAD(stailhead, deadq_entry) deadq_head;
 201 struct stailhead *deadq_headp;
 202
 203 struct deadq_entry {
 204         pid_t                           dq_pid;
 205         int                             dq_timeout;
 206         TAILQ_ENTRY(deadq_entry)        dq_entries;
 207 };
 208
 209 /*
 210  * The timeout to apply to processes waiting on the dead queue.  Unit
 211  * of measure is `mark intervals', i.e. 20 minutes by default.
 212  * Processes on the dead queue will be terminated after that time.
 213  */
 214
 215 #define  DQ_TIMO_INIT   2
 216
 217 typedef struct deadq_entry *dq_t;
 218
 219
 220 /*
 221  * Struct to hold records of network addresses that are allowed to log
 222  * to us.
 223  */
 224 struct allowedpeer {
 225         int isnumeric;
 226         u_short port;
 227         union {
 228                 struct {
 229                         struct sockaddr_storage addr;
 230                         struct sockaddr_storage mask;
 231                 } numeric;
 232                 char *name;
 233         } u;
 234 #define a_addr u.numeric.addr
 235 #define a_mask u.numeric.mask
 236 #define a_name u.name
 237 };
 238
 239
 240 /*
 241  * Intervals at which we flush out "message repeated" messages,
 242  * in seconds after previous message is logged.  After each flush,
 243  * we move to the next interval until we reach the largest.
 244  */
 245 int     repeatinterval[] = { 30, 120, 600 };    /* # of secs before flush */
 246 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1)
 247 #define REPEATTIME(f)   ((f)->f_time + repeatinterval[(f)->f_repeatcount])
 248 #define BACKOFF(f)      { if (++(f)->f_repeatcount > MAXREPEAT) \
 249                                  (f)->f_repeatcount = MAXREPEAT; \
 250                         }
 251
 252 /* values for f_type */
 253 #define F_UNUSED        0               /* unused entry */
 254 #define F_FILE          1               /* regular file */
 255 #define F_TTY           2               /* terminal */
 256 #define F_CONSOLE       3               /* console terminal */
 257 #define F_FORW          4               /* remote machine */
 258 #define F_USERS         5               /* list of users */
 259 #define F_WALL          6               /* everyone logged on */
 260 #define F_PIPE          7               /* pipe to program */
 261 #define F_RING          8               /* ring buffer (circular log) */
 262
 263 const char *TypeNames[] = {
 264         "UNUSED",       "FILE",         "TTY",          "CONSOLE",
 265         "FORW",         "USERS",        "WALL",         "PIPE",
 266         "RING"
 267 };
 268
 269 static struct filed *Files;     /* Log files that we write to */
 270 static struct filed consfile;   /* Console */
 271
 272 static int      Debug;          /* debug flag */
 273 static int      resolve = 1;    /* resolve hostname */
 274 static char     LocalHostName[MAXHOSTNAMELEN];  /* our hostname */
 275 static const char *LocalDomain; /* our local domain name */
 276 static int      *finet;         /* Internet datagram socket */
 277 static int      fklog = -1;     /* /dev/klog */
 278 static int      Initialized;    /* set when we have initialized ourselves */
 279 static int      MarkInterval = 20 * 60; /* interval between marks in seconds */
 280 static int      MarkSeq;        /* mark sequence number */
 281 static int      SecureMode;     /* when true, receive only unix domain socks */
 282 #ifdef INET6
 283 static int      family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
 284 #else
 285 static int      family = PF_INET; /* protocol family (IPv4 only) */
 286 #endif
 287 static int      mask_C1 = 1;    /* mask characters from 0x80 - 0x9F */
 288 static int      send_to_all;    /* send message to all IPv4/IPv6 addresses */
 289 static int      use_bootfile;   /* log entire bootfile for every kern msg */
 290 static int      no_compress;    /* don't compress messages (1=pipes, 2=all) */
 291 static int      logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
 292
 293 static char     bootfile[MAXLINE+1]; /* booted kernel file */
 294
 295 struct allowedpeer *AllowedPeers; /* List of allowed peers */
 296 static int      NumAllowed;     /* Number of entries in AllowedPeers */
 297 static int      RemoteAddDate;  /* Always set the date on remote messages */
 298
 299 static int      UniquePriority; /* Only log specified priority? */
 300 static int      LogFacPri;      /* Put facility and priority in log message: */
 301                                 /* 0=no, 1=numeric, 2=names */
 302 static int      KeepKernFac;    /* Keep remotely logged kernel facility */
 303 static int      needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
 304 static struct pidfh *pfh;
 305
 306 volatile sig_atomic_t MarkSet, WantDie;
 307
 308 static int      allowaddr(char *);
 309 static void     cfline(const char *, struct filed *,
 310                     const char *, const char *);
 311 static const char *cvthname(struct sockaddr *);
 312 static void     deadq_enter(pid_t, const char *);
 313 static int      deadq_remove(pid_t);
 314 static int      decode(const char *, CODE *);
 315 static void     die(int);
 316 static void     dodie(int);
 317 static void     dofsync(void);
 318 static void     domark(int);
 319 static void     fprintlog(struct filed *, int, const char *);
 320 static int      *socksetup(int, const char *);
 321 static void     init(int);
 322 static void     logerror(const char *);
 323 static void     logmsg(int, const char *, const char *, int);
 324 static void     log_deadchild(pid_t, int, const char *);
 325 static void     markit(void);
 326 static int      skip_message(const char *, const char *, int);
 327 static void     printline(const char *, char *, int);
 328 static void     printsys(char *);
 329 static int      p_open(const char *, pid_t *);
 330 ssize_t         rbwrite(struct filed *, char *, size_t);
 331 ssize_t         rbwritev(struct filed *, struct iovec *, int);
 332 static void     readklog(void);
 333 static void     reapchild(int);
 334 static void     usage(void);
 335 static int      validate(struct sockaddr *, const char *);
 336 static void     unmapped(struct sockaddr *);
 337 static void     wallmsg(struct filed *, struct iovec *, const int iovlen);
 338 static int      waitdaemon(int, int, int);
 339 static void     timedout(int);
 340 static void     double_rbuf(int);
 341
 342 int
 343 main(int argc, char *argv[])
 344 {
 345         int ch, i, fdsrmax = 0, l;
 346         struct sockaddr_un sunx, fromunix;
 347         struct sockaddr_storage frominet;
 348         fd_set *fdsr = NULL;
 349         char line[MAXLINE + 1];
 350         const char *bindhostname, *hname;
 351         struct timeval tv, *tvp;
 352         struct sigaction sact;
 353         struct funix *fx, *fx1;
 354         sigset_t mask;
 355         pid_t ppid = 1, spid;
 356         socklen_t len;
 357
 358         bindhostname = NULL;
 359         while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nop:P:sS:Tuv"))
 360             != -1)
 361                 switch (ch) {
 362                 case '4':
 363                         family = PF_INET;
 364                         break;
 365 #ifdef INET6
 366                 case '6':
 367                         family = PF_INET6;
 368                         break;
 369 #endif
 370                 case '8':
 371                         mask_C1 = 0;
 372                         break;
 373                 case 'A':
 374                         send_to_all++;
 375                         break;
 376                 case 'a':               /* allow specific network addresses only */
 377                         if (allowaddr(optarg) == -1)
 378                                 usage();
 379                         break;
 380                 case 'b':
 381                         bindhostname = optarg;
 382                         break;
 383                 case 'c':
 384                         no_compress++;
 385                         break;
 386                 case 'C':
 387                         logflags |= O_CREAT;
 388                         break;
 389                 case 'd':               /* debug */
 390                         Debug++;
 391                         break;
 392                 case 'f':               /* configuration file */
 393                         ConfFile = optarg;
 394                         break;
 395                 case 'k':               /* keep remote kern fac */
 396                         KeepKernFac = 1;
 397                         break;
 398                 case 'l':
 399                     {
 400                         long    perml;
 401                         mode_t  mode;
 402                         char    *name, *ep;
 403
 404                         if (optarg[0] == '/') {
 405                                 mode = DEFFILEMODE;
 406                                 name = optarg;
 407                         } else if ((name = strchr(optarg, ':')) != NULL) {
 408                                 *name++ = '\0';
 409                                 if (name[0] != '/')
 410                                         errx(1, "socket name must be absolute "
 411                                             "path");
 412                                 if (isdigit(*optarg)) {
 413                                         perml = strtol(optarg, &ep, 8);
 414                                     if (*ep || perml < 0 ||
 415                                         perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
 416                                             errx(1, "invalid mode %s, exiting",
 417                                                 optarg);
 418                                     mode = (mode_t )perml;
 419                                 } else
 420                                         errx(1, "invalid mode %s, exiting",
 421                                             optarg);
 422                         } else  /* doesn't begin with '/', and no ':' */
 423                                 errx(1, "can't parse path %s", optarg);
 424
 425                         if (strlen(name) >= sizeof(sunx.sun_path))
 426                                 errx(1, "%s path too long, exiting", name);
 427                         if ((fx = malloc(sizeof(struct funix))) == NULL)
 428                                 errx(1, "malloc failed");
 429                         fx->s = -1;
 430                         fx->name = name;
 431                         fx->mode = mode;
 432                         STAILQ_INSERT_TAIL(&funixes, fx, next);
 433                         break;
 434                    }
 435                 case 'm':               /* mark interval */
 436                         MarkInterval = atoi(optarg) * 60;
 437                         break;
 438                 case 'n':
 439                         resolve = 0;
 440                         break;
 441                 case 'o':
 442                         use_bootfile = 1;
 443                         break;
 444                 case 'p':               /* path */
 445                         if (strlen(optarg) >= sizeof(sunx.sun_path))
 446                                 errx(1, "%s path too long, exiting", optarg);
 447                         funix_default.name = optarg;
 448                         break;
 449                 case 'P':               /* path for alt. PID */
 450                         PidFile = optarg;
 451                         break;
 452                 case 's':               /* no network mode */
 453                         SecureMode++;
 454                         break;
 455                 case 'S':               /* path for privileged originator */
 456                         if (strlen(optarg) >= sizeof(sunx.sun_path))
 457                                 errx(1, "%s path too long, exiting", optarg);
 458                         funix_secure.name = optarg;
 459                         break;
 460                 case 'T':
 461                         RemoteAddDate = 1;
 462                         break;
 463                 case 'u':               /* only log specified priority */
 464                         UniquePriority++;
 465                         break;
 466                 case 'v':               /* log facility and priority */
 467                         LogFacPri++;
 468                         break;
 469                 default:
 470                         usage();
 471                 }
 472         if ((argc -= optind) != 0)
 473                 usage();
 474
 475         pfh = pidfile_open(PidFile, 0600, &spid);
 476         if (pfh == NULL) {
 477                 if (errno == EEXIST)
 478                         errx(1, "syslogd already running, pid: %d", spid);
 479                 warn("cannot open pid file");
 480         }
 481
 482         if (!Debug) {
 483                 ppid = waitdaemon(0, 0, 30);
 484                 if (ppid < 0) {
 485                         warn("could not become daemon");
 486                         pidfile_remove(pfh);
 487                         exit(1);
 488                 }
 489         } else {
 490                 setlinebuf(stdout);
 491         }
 492
 493         if (NumAllowed)
 494                 endservent();
 495
 496         consfile.f_type = F_CONSOLE;
 497         strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1,
 498             sizeof(consfile.f_un.f_fname));
 499         strlcpy(bootfile, getbootfile(), sizeof(bootfile));
 500         signal(SIGTERM, dodie);
 501         signal(SIGINT, Debug ? dodie : SIG_IGN);
 502         signal(SIGQUIT, Debug ? dodie : SIG_IGN);
 503         /*
 504          * We don't want the SIGCHLD and SIGHUP handlers to interfere
 505          * with each other; they are likely candidates for being called
 506          * simultaneously (SIGHUP closes pipe descriptor, process dies,
 507          * SIGCHLD happens).
 508          */
 509         sigemptyset(&mask);
 510         sigaddset(&mask, SIGHUP);
 511         sact.sa_handler = reapchild;
 512         sact.sa_mask = mask;
 513         sact.sa_flags = SA_RESTART;
 514         sigaction(SIGCHLD, &sact, NULL);
 515         signal(SIGALRM, domark);
 516         signal(SIGPIPE, SIG_IGN);       /* We'll catch EPIPE instead. */
 517         alarm(TIMERINTVL);
 518
 519         TAILQ_INIT(&deadq_head);
 520
 521 #ifndef SUN_LEN
 522 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
 523 #endif
 524         STAILQ_FOREACH_MUTABLE(fx, &funixes, next, fx1) {
 525                 unlink(fx->name);
 526                 memset(&sunx, 0, sizeof(sunx));
 527                 sunx.sun_family = AF_LOCAL;
 528                 strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path));
 529                 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0);
 530                 if (fx->s < 0 ||
 531                     bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 ||
 532                     chmod(fx->name, fx->mode) < 0) {
 533                         snprintf(line, sizeof line,
 534                                         "cannot create %s", fx->name);
 535                         logerror(line);
 536                         dprintf("cannot create %s (%d)\n", fx->name, errno);
 537                         if (fx == &funix_default || fx == &funix_secure)
 538                                 die(0);
 539                         else {
 540                                 STAILQ_REMOVE(&funixes, fx, funix, next);
 541                                 continue;
 542                         }
 543                         double_rbuf(fx->s);
 544                 }
 545         }
 546         if (SecureMode <= 1)
 547                 finet = socksetup(family, bindhostname);
 548
 549         if (finet) {
 550                 if (SecureMode) {
 551                         for (i = 0; i < *finet; i++) {
 552                                 if (shutdown(finet[i+1], SHUT_RD) < 0) {
 553                                         logerror("shutdown");
 554                                         if (!Debug)
 555                                                 die(0);
 556                                 }
 557                         }
 558                 } else {
 559                         dprintf("listening on inet and/or inet6 socket\n");
 560                 }
 561                 dprintf("sending on inet and/or inet6 socket\n");
 562         }
 563
 564         if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0)
 565                 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0)
 566                         fklog = -1;
 567         if (fklog < 0)
 568                 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
 569
 570         /* tuck my process id away */
 571         pidfile_write(pfh);
 572
 573         dprintf("off & running....\n");
 574
 575         init(0);
 576         /* prevent SIGHUP and SIGCHLD handlers from running in parallel */
 577         sigemptyset(&mask);
 578         sigaddset(&mask, SIGCHLD);
 579         sact.sa_handler = init;
 580         sact.sa_mask = mask;
 581         sact.sa_flags = SA_RESTART;
 582         sigaction(SIGHUP, &sact, NULL);
 583
 584         tvp = &tv;
 585         tv.tv_sec = tv.tv_usec = 0;
 586
 587         if (fklog != -1 && fklog > fdsrmax)
 588                 fdsrmax = fklog;
 589         if (finet && !SecureMode) {
 590                 for (i = 0; i < *finet; i++) {
 591                     if (finet[i+1] != -1 && finet[i+1] > fdsrmax)
 592                         fdsrmax = finet[i+1];
 593                 }
 594         }
 595         STAILQ_FOREACH(fx, &funixes, next)
 596                 if (fx->s > fdsrmax)
 597                         fdsrmax = fx->s;
 598
 599         fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
 600             sizeof(fd_mask));
 601         if (fdsr == NULL)
 602                 errx(1, "calloc fd_set");
 603
 604         for (;;) {
 605                 if (MarkSet)
 606                         markit();
 607                 if (WantDie)
 608                         die(WantDie);
 609
 610                 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
 611                     sizeof(fd_mask));
 612
 613                 if (fklog != -1)
 614                         FD_SET(fklog, fdsr);
 615                 if (finet && !SecureMode) {
 616                         for (i = 0; i < *finet; i++) {
 617                                 if (finet[i+1] != -1)
 618                                         FD_SET(finet[i+1], fdsr);
 619                         }
 620                 }
 621                 STAILQ_FOREACH(fx, &funixes, next)
 622                         FD_SET(fx->s, fdsr);
 623
 624                 i = select(fdsrmax+1, fdsr, NULL, NULL,
 625                     needdofsync ? &tv : tvp);
 626                 switch (i) {
 627                 case 0:
 628                         dofsync();
 629                         needdofsync = 0;
 630                         if (tvp) {
 631                                 tvp = NULL;
 632                                 if (ppid != 1)
 633                                         kill(ppid, SIGALRM);
 634                         }
 635                         continue;
 636                 case -1:
 637                         if (errno != EINTR)
 638                                 logerror("select");
 639                         continue;
 640                 }
 641                 if (fklog != -1 && FD_ISSET(fklog, fdsr))
 642                         readklog();
 643                 if (finet && !SecureMode) {
 644                         for (i = 0; i < *finet; i++) {
 645                                 if (FD_ISSET(finet[i+1], fdsr)) {
 646                                         len = sizeof(frominet);
 647                                         l = recvfrom(finet[i+1], line, MAXLINE,
 648                                              0, (struct sockaddr *)&frominet,
 649                                              &len);
 650                                         if (l > 0) {
 651                                                 line[l] = '\0';
 652                                                 hname = cvthname((struct sockaddr *)&frominet);
 653                                                 unmapped((struct sockaddr *)&frominet);
 654                                                 if (validate((struct sockaddr *)&frominet, hname))
 655                                                         printline(hname, line, RemoteAddDate ? ADDDATE : 0);
 656                                         } else if (l < 0 && errno != EINTR)
 657                                                 logerror("recvfrom inet");
 658                                 }
 659                         }
 660                 }
 661                 STAILQ_FOREACH(fx, &funixes, next) {
 662                         if (FD_ISSET(fx->s, fdsr)) {
 663                                 len = sizeof(fromunix);
 664                                 l = recvfrom(fx->s, line, MAXLINE, 0,
 665                                     (struct sockaddr *)&fromunix, &len);
 666                                 if (l > 0) {
 667                                         line[l] = '\0';
 668                                         printline(LocalHostName, line, 0);
 669                                 } else if (l < 0 && errno != EINTR)
 670                                         logerror("recvfrom unix");
 671                         }
 672                 }
 673         }
 674         if (fdsr)
 675                 free(fdsr);
 676 }
 677
 678 static void
 679 unmapped(struct sockaddr *sa)
 680 {
 681         struct sockaddr_in6 *sin6;
 682         struct sockaddr_in sin4;
 683
 684         if (sa->sa_family != AF_INET6)
 685                 return;
 686         if (sa->sa_len != sizeof(struct sockaddr_in6) ||
 687             sizeof(sin4) > sa->sa_len)
 688                 return;
 689         sin6 = (struct sockaddr_in6 *)sa;
 690         if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
 691                 return;
 692
 693         memset(&sin4, 0, sizeof(sin4));
 694         sin4.sin_family = AF_INET;
 695         sin4.sin_len = sizeof(struct sockaddr_in);
 696         memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12],
 697                sizeof(sin4.sin_addr));
 698         sin4.sin_port = sin6->sin6_port;
 699
 700         memcpy(sa, &sin4, sin4.sin_len);
 701 }
 702
 703 static void
 704 usage(void)
 705 {
 706
 707         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 708                 "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]",
 709                 "               [-b bind_address] [-f config_file]",
 710                 "               [-l [mode:]path] [-m mark_interval]",
 711                 "               [-P pid_file] [-p log_socket]");
 712         exit(1);
 713 }
 714
 715 /*
 716  * Take a raw input line, decode the message, and print the message
 717  * on the appropriate log files.
 718  */
 719 static void
 720 printline(const char *hname, char *msg, int flags)
 721 {
 722         char *p, *q;
 723         long n;
 724         int c, pri;
 725         char line[MAXLINE + 1];
 726
 727         /* test for special codes */
 728         p = msg;
 729         pri = DEFUPRI;
 730         if (*p == '<') {
 731                 errno = 0;
 732                 n = strtol(p + 1, &q, 10);
 733                 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
 734                         p = q + 1;
 735                         pri = n;
 736                 }
 737         }
 738         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
 739                 pri = DEFUPRI;
 740
 741         /*
 742          * Don't allow users to log kernel messages.
 743          * NOTE: since LOG_KERN == 0 this will also match
 744          *       messages with no facility specified.
 745          */
 746         if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
 747                 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
 748
 749         q = line;
 750
 751         while ((c = (unsigned char)*p++) != '\0' &&
 752             q < &line[sizeof(line) - 4]) {
 753                 if (mask_C1 && (c & 0x80) && c < 0xA0) {
 754                         c &= 0x7F;
 755                         *q++ = 'M';
 756                         *q++ = '-';
 757                 }
 758                 if (isascii(c) && iscntrl(c)) {
 759                         if (c == '\n') {
 760                                 *q++ = ' ';
 761                         } else if (c == '\t') {
 762                                 *q++ = '\t';
 763                         } else {
 764                                 *q++ = '^';
 765                                 *q++ = c ^ 0100;
 766                         }
 767                 } else {
 768                         *q++ = c;
 769                 }
 770         }
 771         *q = '\0';
 772
 773         logmsg(pri, line, hname, flags);
 774 }
 775
 776 /*
 777  * Read /dev/klog while data are available, split into lines.
 778  */
 779 static void
 780 readklog(void)
 781 {
 782         char *p, *q, line[MAXLINE + 1];
 783         int len, i;
 784
 785         len = 0;
 786         for (;;) {
 787                 i = read(fklog, line + len, MAXLINE - 1 - len);
 788                 if (i > 0) {
 789                         line[i + len] = '\0';
 790                 } else {
 791                         if (i < 0 && errno != EINTR && errno != EAGAIN) {
 792                                 logerror("klog");
 793                                 fklog = -1;
 794                         }
 795                         break;
 796                 }
 797
 798                 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
 799                         *q = '\0';
 800                         printsys(p);
 801                 }
 802                 len = strlen(p);
 803                 if (len >= MAXLINE - 1) {
 804                         printsys(p);
 805                         len = 0;
 806                 }
 807                 if (len > 0)
 808                         memmove(line, p, len + 1);
 809         }
 810         if (len > 0)
 811                 printsys(line);
 812 }
 813
 814 /*
 815  * Take a raw input line from /dev/klog, format similar to syslog().
 816  */
 817 static void
 818 printsys(char *msg)
 819 {
 820         char *p, *q;
 821         long n;
 822         int flags, isprintf, pri;
 823
 824         flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */
 825         p = msg;
 826         pri = DEFSPRI;
 827         isprintf = 1;
 828         if (*p == '<') {
 829                 errno = 0;
 830                 n = strtol(p + 1, &q, 10);
 831                 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
 832                         p = q + 1;
 833                         pri = n;
 834                         isprintf = 0;
 835                 }
 836         }
 837         /*
 838          * Kernel printf's and LOG_CONSOLE messages have been displayed
 839          * on the console already.
 840          */
 841         if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
 842                 flags |= IGN_CONS;
 843         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
 844                 pri = DEFSPRI;
 845         logmsg(pri, p, LocalHostName, flags);
 846 }
 847
 848 static time_t   now;
 849
 850 /*
 851  * Match a program or host name against a specification.
 852  * Return a non-0 value if the message must be ignored
 853  * based on the specification.
 854  */
 855 static int
 856 skip_message(const char *name, const char *spec, int checkcase)
 857 {
 858         const char *s;
 859         char prev, next;
 860         int exclude = 0;
 861         /* Behaviour on explicit match */
 862
 863         if (spec == NULL)
 864                 return 0;
 865         switch (*spec) {
 866         case '-':
 867                 exclude = 1;
 868                 /*FALLTHROUGH*/
 869         case '+':
 870                 spec++;
 871                 break;
 872         default:
 873                 break;
 874         }
 875         if (checkcase)
 876                 s = strstr (spec, name);
 877         else
 878                 s = strcasestr (spec, name);
 879
 880         if (s != NULL) {
 881                 prev = (s == spec ? ',' : *(s - 1));
 882                 next = *(s + strlen (name));
 883
 884                 if (prev == ',' && (next == '\0' || next == ','))
 885                         /* Explicit match: skip iff the spec is an
 886                            exclusive one. */
 887                         return exclude;
 888         }
 889
 890         /* No explicit match for this name: skip the message iff
 891            the spec is an inclusive one. */
 892         return !exclude;
 893 }
 894
 895 /*
 896  * Log a message to the appropriate log files, users, etc. based on
 897  * the priority.
 898  */
 899 static void
 900 logmsg(int pri, const char *msg, const char *from, int flags)
 901 {
 902         struct filed *f;
 903         int i, fac, msglen, omask, prilev;
 904         const char *timestamp;
 905         char prog[NAME_MAX+1];
 906         char buf[MAXLINE+1];
 907
 908         dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
 909             pri, flags, from, msg);
 910
 911         omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM));
 912
 913         /*
 914          * Check to see if msg looks non-standard.
 915          */
 916         msglen = strlen(msg);
 917         if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' ||
 918             msg[9] != ':' || msg[12] != ':' || msg[15] != ' ')
 919                 flags |= ADDDATE;
 920
 921         time(&now);
 922         if (flags & ADDDATE) {
 923                 timestamp = ctime(&now) + 4;
 924         } else {
 925                 timestamp = msg;
 926                 msg += 16;
 927                 msglen -= 16;
 928         }
 929
 930         /* skip leading blanks */
 931         while (isspace(*msg)) {
 932                 msg++;
 933                 msglen--;
 934         }
 935
 936         /* extract facility and priority level */
 937         if (flags & MARK)
 938                 fac = LOG_NFACILITIES;
 939         else
 940                 fac = LOG_FAC(pri);
 941
 942         /* Check maximum facility number. */
 943         if (fac > LOG_NFACILITIES) {
 944                 sigsetmask(omask);
 945                 return;
 946         }
 947
 948         prilev = LOG_PRI(pri);
 949
 950         /* extract program name */
 951         for (i = 0; i < NAME_MAX; i++) {
 952                 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' ||
 953                     msg[i] == '/' || isspace(msg[i]))
 954                         break;
 955                 prog[i] = msg[i];
 956         }
 957         prog[i] = 0;
 958
 959         /* add kernel prefix for kernel messages */
 960         if (flags & ISKERNEL) {
 961                 snprintf(buf, sizeof(buf), "%s: %s",
 962                     use_bootfile ? bootfile : "kernel", msg);
 963                 msg = buf;
 964                 msglen = strlen(buf);
 965         }
 966
 967         /* log the message to the particular outputs */
 968         if (!Initialized) {
 969                 f = &consfile;
 970                 /*
 971                  * Open in non-blocking mode to avoid hangs during open
 972                  * and close(waiting for the port to drain).
 973                  */
 974                 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
 975
 976                 if (f->f_file >= 0) {
 977                         strlcpy(f->f_lasttime, timestamp,
 978                                 sizeof(f->f_lasttime));
 979                         fprintlog(f, flags, msg);
 980                         close(f->f_file);
 981                 }
 982                 sigsetmask(omask);
 983                 return;
 984         }
 985         for (f = Files; f; f = f->f_next) {
 986                 /* skip messages that are incorrect priority */
 987                 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
 988                      ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
 989                      ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
 990                      )
 991                     || f->f_pmask[fac] == INTERNAL_NOPRI)
 992                         continue;
 993
 994                 /* skip messages with the incorrect hostname */
 995                 if (skip_message(from, f->f_host, 0))
 996                         continue;
 997
 998                 /* skip messages with the incorrect program name */
 999                 if (skip_message(prog, f->f_program, 1))
1000                         continue;
1001
1002                 /* skip message to console if it has already been printed */
1003                 if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1004                         continue;
1005
1006                 /* don't output marks to recently written files */
1007                 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1008                         continue;
1009
1010                 /*
1011                  * suppress duplicate lines to this file
1012                  */
1013                 if (no_compress - (f->f_type != F_PIPE) < 1 &&
1014                     (flags & MARK) == 0 && msglen == f->f_prevlen &&
1015                     f->f_prevline && !strcmp(msg, f->f_prevline) &&
1016                     !strcasecmp(from, f->f_prevhost)) {
1017                         strlcpy(f->f_lasttime, timestamp,
1018                                 sizeof(f->f_lasttime));
1019                         f->f_prevcount++;
1020                         dprintf("msg repeated %d times, %ld sec of %d\n",
1021                             f->f_prevcount, (long)(now - f->f_time),
1022                             repeatinterval[f->f_repeatcount]);
1023                         /*
1024                          * If domark would have logged this by now,
1025                          * flush it now (so we don't hold isolated messages),
1026                          * but back off so we'll flush less often
1027                          * in the future.
1028                          */
1029                         if (now > REPEATTIME(f)) {
1030                                 fprintlog(f, flags, NULL);
1031                                 BACKOFF(f);
1032                         }
1033                 } else {
1034                         /* new line, save it */
1035                         if (f->f_prevcount)
1036                                 fprintlog(f, 0, NULL);
1037                         f->f_repeatcount = 0;
1038                         f->f_prevpri = pri;
1039                         strlcpy(f->f_lasttime, timestamp,
1040                                 sizeof(f->f_lasttime));
1041                         strlcpy(f->f_prevhost, from, sizeof(f->f_prevhost));
1042                         if (msglen < MAXSVLINE) {
1043                                 f->f_prevlen = msglen;
1044                                 strlcpy(f->f_prevline, msg, sizeof(f->f_prevline));
1045                                 fprintlog(f, flags, NULL);
1046                         } else {
1047                                 f->f_prevline[0] = 0;
1048                                 f->f_prevlen = 0;
1049                                 fprintlog(f, flags, msg);
1050                         }
1051                 }
1052         }
1053         sigsetmask(omask);
1054 }
1055
1056 static void
1057 dofsync(void)
1058 {
1059         struct filed *f;
1060
1061         for (f = Files; f; f = f->f_next) {
1062                 if ((f->f_type == F_FILE) &&
1063                     (f->f_flags & FFLAG_NEEDSYNC)) {
1064                         f->f_flags &= ~FFLAG_NEEDSYNC;
1065                         fsync(f->f_file);
1066                 }
1067         }
1068 }
1069
1070 #define IOV_SIZE 7
1071 static void
1072 fprintlog(struct filed *f, int flags, const char *msg)
1073 {
1074         struct iovec iov[IOV_SIZE];
1075         struct iovec *v;
1076         struct addrinfo *r;
1077         int i, l, lsent = 0;
1078         char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL;
1079         char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n";
1080         const char *msgret;
1081
1082         v = iov;
1083         if (f->f_type == F_WALL) {
1084                 v->iov_base = greetings;
1085                 /* The time displayed is not synchornized with the other log
1086                  * destinations (like messages).  Following fragment was using
1087                  * ctime(&now), which was updating the time every 30 sec.
1088                  * With f_lasttime, time is synchronized correctly.
1089                  */
1090                 v->iov_len = snprintf(greetings, sizeof greetings,
1091                     "\r\n\7Message from syslogd@%s at %.24s ...\r\n",
1092                     f->f_prevhost, f->f_lasttime);
1093                 if (v->iov_len > 0)
1094                         v++;
1095                 v->iov_base = nul;
1096                 v->iov_len = 0;
1097                 v++;
1098         } else {
1099                 v->iov_base = f->f_lasttime;
1100                 v->iov_len = strlen(f->f_lasttime);
1101                 v++;
1102                 v->iov_base = space;
1103                 v->iov_len = 1;
1104                 v++;
1105         }
1106
1107         if (LogFacPri) {
1108                 static char fp_buf[30]; /* Hollow laugh */
1109                 int fac = f->f_prevpri & LOG_FACMASK;
1110                 int pri = LOG_PRI(f->f_prevpri);
1111                 const char *f_s = NULL;
1112                 char f_n[5];    /* Hollow laugh */
1113                 const char *p_s = NULL;
1114                 char p_n[5];    /* Hollow laugh */
1115
1116                 if (LogFacPri > 1) {
1117                   CODE *c;
1118
1119                   for (c = facilitynames; c->c_name; c++) {
1120                     if (c->c_val == fac) {
1121                       f_s = c->c_name;
1122                       break;
1123                     }
1124                   }
1125                   for (c = prioritynames; c->c_name; c++) {
1126                     if (c->c_val == pri) {
1127                       p_s = c->c_name;
1128                       break;
1129                     }
1130                   }
1131                 }
1132                 if (!f_s) {
1133                   snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac));
1134                   f_s = f_n;
1135                 }
1136                 if (!p_s) {
1137                   snprintf(p_n, sizeof p_n, "%d", pri);
1138                   p_s = p_n;
1139                 }
1140                 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s);
1141                 v->iov_base = fp_buf;
1142                 v->iov_len = strlen(fp_buf);
1143         } else {
1144                 v->iov_base = nul;
1145                 v->iov_len = 0;
1146         }
1147         v++;
1148
1149         v->iov_base = f->f_prevhost;
1150         v->iov_len = strlen(v->iov_base);
1151         v++;
1152         v->iov_base = space;
1153         v->iov_len = 1;
1154         v++;
1155
1156         if (msg) {
1157                 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */
1158                 if (wmsg == NULL) {
1159                         logerror("strdup");
1160                         exit(1);
1161                 }
1162                 v->iov_base = wmsg;
1163                 v->iov_len = strlen(msg);
1164         } else if (f->f_prevcount > 1) {
1165                 v->iov_base = repbuf;
1166                 v->iov_len = snprintf(repbuf, sizeof repbuf,
1167                     "last message repeated %d times", f->f_prevcount);
1168         } else if (f->f_prevline) {
1169                 v->iov_base = f->f_prevline;
1170                 v->iov_len = f->f_prevlen;
1171         } else {
1172                 return;
1173         }
1174         v++;
1175
1176         dprintf("Logging to %s", TypeNames[f->f_type]);
1177         f->f_time = now;
1178
1179         switch (f->f_type) {
1180                 int port;
1181         case F_UNUSED:
1182                 dprintf("\n");
1183                 break;
1184
1185         case F_FORW:
1186                 port = (int)ntohs(((struct sockaddr_in *)
1187                             (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1188                 if (port != 514) {
1189                         dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port);
1190                 } else {
1191                         dprintf(" %s\n", f->f_un.f_forw.f_hname);
1192                 }
1193                 /* check for local vs remote messages */
1194                 if (strcasecmp(f->f_prevhost, LocalHostName))
1195                         l = snprintf(line, sizeof line - 1,
1196                             "<%d>%.15s Forwarded from %s: %s",
1197                             f->f_prevpri, (char *)iov[0].iov_base,
1198                             f->f_prevhost, (char *)iov[5].iov_base);
1199                 else
1200                         l = snprintf(line, sizeof line - 1, "<%d>%.15s %s",
1201                              f->f_prevpri, (char *)iov[0].iov_base,
1202                             (char *)iov[5].iov_base);
1203                 if (l < 0)
1204                         l = 0;
1205                 else if (l > MAXLINE)
1206                         l = MAXLINE;
1207
1208                 if (finet) {
1209                         for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) {
1210                                 for (i = 0; i < *finet; i++) {
1211 #if 0
1212                                         /*
1213                                          * should we check AF first, or just
1214                                          * trial and error? FWD
1215                                          */
1216                                         if (r->ai_family ==
1217                                             address_family_of(finet[i+1]))
1218 #endif
1219                                         lsent = sendto(finet[i+1], line, l, 0,
1220                                             r->ai_addr, r->ai_addrlen);
1221                                         if (lsent == l)
1222                                                 break;
1223                                 }
1224                                 if (lsent == l && !send_to_all)
1225                                         break;
1226                         }
1227                         dprintf("lsent/l: %d/%d\n", lsent, l);
1228                         if (lsent != l) {
1229                                 int e = errno;
1230                                 logerror("sendto");
1231                                 errno = e;
1232                                 switch (errno) {
1233                                 case ENOBUFS:
1234                                 case ENETDOWN:
1235                                 case EHOSTUNREACH:
1236                                 case EHOSTDOWN:
1237                                         break;
1238                                 /* case EBADF: */
1239                                 /* case EACCES: */
1240                                 /* case ENOTSOCK: */
1241                                 /* case EFAULT: */
1242                                 /* case EMSGSIZE: */
1243                                 /* case EAGAIN: */
1244                                 /* case ENOBUFS: */
1245                                 /* case ECONNREFUSED: */
1246                                 default:
1247                                         dprintf("removing entry\n");
1248                                         f->f_type = F_UNUSED;
1249                                         break;
1250                                 }
1251                         }
1252                 }
1253                 break;
1254
1255         case F_FILE:
1256                 dprintf(" %s\n", f->f_un.f_fname);
1257                 v->iov_base = lf;
1258                 v->iov_len = 1;
1259                 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1260                         /*
1261                          * If writev(2) fails for potentially transient errors
1262                          * like the filesystem being full, ignore it.
1263                          * Otherwise remove this logfile from the list.
1264                          */
1265                         if (errno != ENOSPC) {
1266                                 int e = errno;
1267                                 close(f->f_file);
1268                                 f->f_type = F_UNUSED;
1269                                 errno = e;
1270                                 logerror(f->f_un.f_fname);
1271                         }
1272                 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1273                         f->f_flags |= FFLAG_NEEDSYNC;
1274                         needdofsync = 1;
1275                 }
1276                 break;
1277
1278         case F_RING:
1279                 dprintf(" %s\n", f->f_un.f_ring.f_rname);
1280                 v->iov_base = lf;
1281                 v->iov_len = 1;
1282                 if (rbwritev(f, iov, 7) == -1) {
1283                         int e = errno;
1284                         munmap(f->f_un.f_ring.f_footer,
1285                                 sizeof(struct clog_footer));
1286                         close(f->f_file);
1287                         f->f_type = F_UNUSED;
1288                         errno = e;
1289                         logerror(f->f_un.f_fname);
1290                 }
1291                 break;
1292
1293         case F_PIPE:
1294                 dprintf(" %s\n", f->f_un.f_pipe.f_pname);
1295                 v->iov_base = lf;
1296                 v->iov_len = 1;
1297                 if (f->f_un.f_pipe.f_pid == 0) {
1298                         if ((f->f_file = p_open(f->f_un.f_pipe.f_pname,
1299                                                 &f->f_un.f_pipe.f_pid)) < 0) {
1300                                 f->f_type = F_UNUSED;
1301                                 logerror(f->f_un.f_pipe.f_pname);
1302                                 break;
1303                         }
1304                 }
1305                 if (writev(f->f_file, iov, IOV_SIZE) < 0) {
1306                         int e = errno;
1307                         close(f->f_file);
1308                         if (f->f_un.f_pipe.f_pid > 0)
1309                                 deadq_enter(f->f_un.f_pipe.f_pid,
1310                                             f->f_un.f_pipe.f_pname);
1311                         f->f_un.f_pipe.f_pid = 0;
1312                         errno = e;
1313                         logerror(f->f_un.f_pipe.f_pname);
1314                 }
1315                 break;
1316
1317         case F_CONSOLE:
1318                 if (flags & IGN_CONS) {
1319                         dprintf(" (ignored)\n");
1320                         break;
1321                 }
1322                 /* FALLTHROUGH */
1323
1324         case F_TTY:
1325                 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname);
1326                 v->iov_base = crlf;
1327                 v->iov_len = 2;
1328
1329                 errno = 0;      /* ttymsg() only sometimes returns an errno */
1330                 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) {
1331                         f->f_type = F_UNUSED;
1332                         logerror(msgret);
1333                 }
1334                 break;
1335
1336         case F_USERS:
1337         case F_WALL:
1338                 dprintf("\n");
1339                 v->iov_base = crlf;
1340                 v->iov_len = 2;
1341                 wallmsg(f, iov, IOV_SIZE);
1342                 break;
1343         }
1344         f->f_prevcount = 0;
1345         free(wmsg);
1346 }
1347
1348 /*
1349  *  WALLMSG -- Write a message to the world at large
1350  *
1351  *      Write the specified message to either the entire
1352  *      world, or a list of approved users.
1353  */
1354 static void
1355 wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1356 {
1357         static int reenter;                     /* avoid calling ourselves */
1358         FILE *uf;
1359         struct utmp ut;
1360         int i;
1361         const char *p;
1362         char line[sizeof(ut.ut_line) + 1];
1363
1364         if (reenter++)
1365                 return;
1366         if ((uf = fopen(_PATH_UTMP, "r")) == NULL) {
1367                 logerror(_PATH_UTMP);
1368                 reenter = 0;
1369                 return;
1370         }
1371         /* NOSTRICT */
1372         while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) {
1373                 if (ut.ut_name[0] == '\0')
1374                         continue;
1375                 /* We must use strncpy since ut_* may not be NUL terminated. */
1376                 strncpy(line, ut.ut_line, sizeof(line) - 1);
1377                 line[sizeof(line) - 1] = '\0';
1378                 if (f->f_type == F_WALL) {
1379                         if ((p = ttymsg(iov, iovlen, line, TTYMSGTIME)) !=
1380                             NULL) {
1381                                 errno = 0;      /* already in msg */
1382                                 logerror(p);
1383                         }
1384                         continue;
1385                 }
1386                 /* should we send the message to this user? */
1387                 for (i = 0; i < MAXUNAMES; i++) {
1388                         if (!f->f_un.f_uname[i][0])
1389                                 break;
1390                         if (!strncmp(f->f_un.f_uname[i], ut.ut_name,
1391                             UT_NAMESIZE)) {
1392                                 if ((p = ttymsg(iov, iovlen, line, TTYMSGTIME))
1393                                     != NULL) {
1394                                         errno = 0;      /* already in msg */
1395                                         logerror(p);
1396                                 }
1397                                 break;
1398                         }
1399                 }
1400         }
1401         fclose(uf);
1402         reenter = 0;
1403 }
1404
1405 static void
1406 reapchild(int signo __unused)
1407 {
1408         int status;
1409         pid_t pid;
1410         struct filed *f;
1411
1412         while ((pid = wait3(&status, WNOHANG, NULL)) > 0) {
1413                 if (!Initialized)
1414                         /* Don't tell while we are initting. */
1415                         continue;
1416
1417                 /* First, look if it's a process from the dead queue. */
1418                 if (deadq_remove(pid))
1419                         goto oncemore;
1420
1421                 /* Now, look in list of active processes. */
1422                 for (f = Files; f; f = f->f_next)
1423                         if (f->f_type == F_PIPE &&
1424                             f->f_un.f_pipe.f_pid == pid) {
1425                                 close(f->f_file);
1426                                 f->f_un.f_pipe.f_pid = 0;
1427                                 log_deadchild(pid, status,
1428                                               f->f_un.f_pipe.f_pname);
1429                                 break;
1430                         }
1431           oncemore:
1432                 continue;
1433         }
1434 }
1435
1436 /*
1437  * Return a printable representation of a host address.
1438  */
1439 static const char *
1440 cvthname(struct sockaddr *f)
1441 {
1442         int error, hl;
1443         sigset_t omask, nmask;
1444         static char hname[NI_MAXHOST], ip[NI_MAXHOST];
1445
1446         error = getnameinfo((struct sockaddr *)f,
1447                             ((struct sockaddr *)f)->sa_len,
1448                             ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
1449         dprintf("cvthname(%s)\n", ip);
1450
1451         if (error) {
1452                 dprintf("Malformed from address %s\n", gai_strerror(error));
1453                 return ("???");
1454         }
1455         if (!resolve)
1456                 return (ip);
1457
1458         sigemptyset(&nmask);
1459         sigaddset(&nmask, SIGHUP);
1460         sigprocmask(SIG_BLOCK, &nmask, &omask);
1461         error = getnameinfo((struct sockaddr *)f,
1462                             ((struct sockaddr *)f)->sa_len,
1463                             hname, sizeof hname, NULL, 0, NI_NAMEREQD);
1464         sigprocmask(SIG_SETMASK, &omask, NULL);
1465         if (error) {
1466                 dprintf("Host name for your address (%s) unknown\n", ip);
1467                 return (ip);
1468         }
1469         hl = strlen(hname);
1470         if (hl > 0 && hname[hl-1] == '.')
1471                 hname[--hl] = '\0';
1472         trimdomain(hname, hl);
1473         return (hname);
1474 }
1475
1476 static void
1477 dodie(int signo)
1478 {
1479
1480         WantDie = signo;
1481 }
1482
1483 static void
1484 domark(int signo __unused)
1485 {
1486
1487         MarkSet = 1;
1488 }
1489
1490 /*
1491  * Print syslogd errors some place.
1492  */
1493 static void
1494 logerror(const char *type)
1495 {
1496         char buf[512];
1497         static int recursed = 0;
1498
1499         /* If there's an error while trying to log an error, give up. */
1500         if (recursed)
1501                 return;
1502         recursed++;
1503         if (errno)
1504                 snprintf(buf,
1505                     sizeof buf, "syslogd: %s: %s", type, strerror(errno));
1506         else
1507                 snprintf(buf, sizeof buf, "syslogd: %s", type);
1508         errno = 0;
1509         dprintf("%s\n", buf);
1510         logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE);
1511         recursed--;
1512 }
1513
1514 static void
1515 die(int signo)
1516 {
1517         struct filed *f;
1518         struct funix *fx;
1519         int was_initialized;
1520         char buf[100];
1521
1522         was_initialized = Initialized;
1523         Initialized = 0;        /* Don't log SIGCHLDs. */
1524         for (f = Files; f != NULL; f = f->f_next) {
1525                 /* flush any pending output */
1526                 if (f->f_prevcount)
1527                         fprintlog(f, 0, NULL);
1528                 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) {
1529                         close(f->f_file);
1530                         f->f_un.f_pipe.f_pid = 0;
1531                 }
1532         }
1533         Initialized = was_initialized;
1534         if (signo) {
1535                 dprintf("syslogd: exiting on signal %d\n", signo);
1536                 snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
1537                 errno = 0;
1538                 logerror(buf);
1539         }
1540         STAILQ_FOREACH(fx, &funixes, next)
1541                 unlink(fx->name);
1542         pidfile_remove(pfh);
1543
1544         exit(1);
1545 }
1546
1547 /*
1548  *  INIT -- Initialize syslogd from configuration table
1549  */
1550 static void
1551 init(int signo)
1552 {
1553         int i;
1554         FILE *cf;
1555         struct filed *f, *next, **nextp;
1556         char *p;
1557         char cline[LINE_MAX];
1558         char prog[NAME_MAX+1];
1559         char host[MAXHOSTNAMELEN];
1560         char oldLocalHostName[MAXHOSTNAMELEN];
1561         char hostMsg[2*MAXHOSTNAMELEN+40];
1562         char bootfileMsg[LINE_MAX];
1563
1564         dprintf("init\n");
1565
1566         /*
1567          * Load hostname (may have changed).
1568          */
1569         if (signo != 0)
1570                 strlcpy(oldLocalHostName, LocalHostName,
1571                     sizeof(oldLocalHostName));
1572         if (gethostname(LocalHostName, sizeof(LocalHostName)))
1573                 err(EX_OSERR, "gethostname() failed");
1574         if ((p = strchr(LocalHostName, '.')) != NULL) {
1575                 *p++ = '\0';
1576                 LocalDomain = p;
1577         } else {
1578                 LocalDomain = "";
1579         }
1580
1581         /*
1582          *  Close all open log files.
1583          */
1584         Initialized = 0;
1585         for (f = Files; f != NULL; f = next) {
1586                 /* flush any pending output */
1587                 if (f->f_prevcount)
1588                         fprintlog(f, 0, NULL);
1589
1590                 switch (f->f_type) {
1591                 case F_FILE:
1592                 case F_FORW:
1593                 case F_CONSOLE:
1594                 case F_TTY:
1595                         close(f->f_file);
1596                         break;
1597                 case F_PIPE:
1598                         if (f->f_un.f_pipe.f_pid > 0) {
1599                                 close(f->f_file);
1600                                 deadq_enter(f->f_un.f_pipe.f_pid,
1601                                             f->f_un.f_pipe.f_pname);
1602                         }
1603                         f->f_un.f_pipe.f_pid = 0;
1604                         break;
1605                 case F_RING:
1606                         munmap(f->f_un.f_ring.f_footer,
1607                                 sizeof(struct clog_footer));
1608                         close(f->f_file);
1609                         break;
1610                 }
1611                 next = f->f_next;
1612                 if (f->f_program) free(f->f_program);
1613                 if (f->f_host) free(f->f_host);
1614                 free((char *)f);
1615         }
1616         Files = NULL;
1617         nextp = &Files;
1618
1619         /* open the configuration file */
1620         if ((cf = fopen(ConfFile, "r")) == NULL) {
1621                 dprintf("cannot open %s\n", ConfFile);
1622                 *nextp = (struct filed *)calloc(1, sizeof(*f));
1623                 if (*nextp == NULL) {
1624                         logerror("calloc");
1625                         exit(1);
1626                 }
1627                 cfline("*.ERR\t/dev/console", *nextp, "*", "*");
1628                 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f));
1629                 if ((*nextp)->f_next == NULL) {
1630                         logerror("calloc");
1631                         exit(1);
1632                 }
1633                 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*");
1634                 Initialized = 1;
1635                 return;
1636         }
1637
1638         /*
1639          *  Foreach line in the conf table, open that file.
1640          */
1641         f = NULL;
1642         strlcpy(host, "*", sizeof(host));
1643         strlcpy(prog, "*", sizeof(prog));
1644         while (fgets(cline, sizeof(cline), cf) != NULL) {
1645                 /*
1646                  * check for end-of-section, comments, strip off trailing
1647                  * spaces and newline character. #!prog is treated specially:
1648                  * following lines apply only to that program.
1649                  */
1650                 for (p = cline; isspace(*p); ++p)
1651                         continue;
1652                 if (*p == 0)
1653                         continue;
1654                 if (*p == '#') {
1655                         p++;
1656                         if (*p != '!' && *p != '+' && *p != '-')
1657                                 continue;
1658                 }
1659                 if (*p == '+' || *p == '-') {
1660                         host[0] = *p++;
1661                         while (isspace(*p))
1662                                 p++;
1663                         if ((!*p) || (*p == '*')) {
1664                                 strlcpy(host, "*", sizeof(host));
1665                                 continue;
1666                         }
1667                         if (*p == '@')
1668                                 p = LocalHostName;
1669                         for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
1670                                 if (!isalnum(*p) && *p != '.' && *p != '-'
1671                                     && *p != ',' && *p != ':' && *p != '%')
1672                                         break;
1673                                 host[i] = *p++;
1674                         }
1675                         host[i] = '\0';
1676                         continue;
1677                 }
1678                 if (*p == '!') {
1679                         p++;
1680                         while (isspace(*p)) p++;
1681                         if ((!*p) || (*p == '*')) {
1682                                 strlcpy(prog, "*", sizeof(prog));
1683                                 continue;
1684                         }
1685                         for (i = 0; i < NAME_MAX; i++) {
1686                                 if (!isprint(p[i]) || isspace(p[i]))
1687                                         break;
1688                                 prog[i] = p[i];
1689                         }
1690                         prog[i] = 0;
1691                         continue;
1692                 }
1693                 for (p = cline + 1; *p != '\0'; p++) {
1694                         if (*p != '#')
1695                                 continue;
1696                         if (*(p - 1) == '\\') {
1697                                 strcpy(p - 1, p);
1698                                 p--;
1699                                 continue;
1700                         }
1701                         *p = '\0';
1702                         break;
1703                 }
1704                 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
1705                         cline[i] = '\0';
1706                 f = (struct filed *)calloc(1, sizeof(*f));
1707                 if (f == NULL) {
1708                         logerror("calloc");
1709                         exit(1);
1710                 }
1711                 *nextp = f;
1712                 nextp = &f->f_next;
1713                 cfline(cline, f, prog, host);
1714         }
1715
1716         /* close the configuration file */
1717         fclose(cf);
1718
1719         Initialized = 1;
1720
1721         if (Debug) {
1722                 int port;
1723                 for (f = Files; f; f = f->f_next) {
1724                         for (i = 0; i <= LOG_NFACILITIES; i++)
1725                                 if (f->f_pmask[i] == INTERNAL_NOPRI)
1726                                         printf("X ");
1727                                 else
1728                                         printf("%d ", f->f_pmask[i]);
1729                         printf("%s: ", TypeNames[f->f_type]);
1730                         switch (f->f_type) {
1731                         case F_FILE:
1732                                 printf("%s", f->f_un.f_fname);
1733                                 break;
1734
1735                         case F_CONSOLE:
1736                         case F_TTY:
1737                                 printf("%s%s", _PATH_DEV, f->f_un.f_fname);
1738                                 break;
1739
1740                         case F_FORW:
1741                                 port = (int)ntohs(((struct sockaddr_in *)
1742                                     (f->f_un.f_forw.f_addr->ai_addr))->sin_port);
1743                                 if (port != 514) {
1744                                         printf("%s:%d",
1745                                                 f->f_un.f_forw.f_hname, port);
1746                                 } else {
1747                                         printf("%s", f->f_un.f_forw.f_hname);
1748                                 }
1749                                 break;
1750
1751                         case F_RING:
1752                                 printf("%s", f->f_un.f_ring.f_rname);
1753                                 break;
1754
1755                         case F_PIPE:
1756                                 printf("%s", f->f_un.f_pipe.f_pname);
1757                                 break;
1758
1759                         case F_USERS:
1760                                 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++)
1761                                         printf("%s, ", f->f_un.f_uname[i]);
1762                                 break;
1763                         }
1764                         if (f->f_program)
1765                                 printf(" (%s)", f->f_program);
1766                         printf("\n");
1767                 }
1768         }
1769
1770         logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
1771         dprintf("syslogd: restarted\n");
1772         /*
1773          * Log a change in hostname, but only on a restart.
1774          */
1775         if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
1776                 snprintf(hostMsg, sizeof(hostMsg),
1777                     "syslogd: hostname changed, \"%s\" to \"%s\"",
1778                     oldLocalHostName, LocalHostName);
1779                 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
1780                 dprintf("%s\n", hostMsg);
1781         }
1782         /*
1783          * Log the kernel boot file if we aren't going to use it as
1784          * the prefix, and if this is *not* a restart.
1785          */
1786         if (signo == 0 && !use_bootfile) {
1787                 snprintf(bootfileMsg, sizeof(bootfileMsg),
1788                     "syslogd: kernel boot file is %s", bootfile);
1789                 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE);
1790                 dprintf("%s\n", bootfileMsg);
1791         }
1792 }
1793
1794 /*
1795  * Crack a configuration file line
1796  */
1797 static void
1798 cfline(const char *line, struct filed *f, const char *prog, const char *host)
1799 {
1800         struct addrinfo hints, *res;
1801         int error, i, pri, syncfile;
1802         const char *p, *q;
1803         char *bp;
1804         char buf[MAXLINE], ebuf[100];
1805         struct stat sb;
1806
1807         dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
1808
1809         errno = 0;      /* keep strerror() stuff out of logerror messages */
1810
1811         /* clear out file entry */
1812         memset(f, 0, sizeof(*f));
1813         for (i = 0; i <= LOG_NFACILITIES; i++)
1814                 f->f_pmask[i] = INTERNAL_NOPRI;
1815
1816         /* save hostname if any */
1817         if (host && *host == '*')
1818                 host = NULL;
1819         if (host) {
1820                 int hl;
1821
1822                 f->f_host = strdup(host);
1823                 if (f->f_host == NULL) {
1824                         logerror("strdup");
1825                         exit(1);
1826                 }
1827                 hl = strlen(f->f_host);
1828                 if (hl > 0 && f->f_host[hl-1] == '.')
1829                         f->f_host[--hl] = '\0';
1830                 trimdomain(f->f_host, hl);
1831         }
1832
1833         /* save program name if any */
1834         if (prog && *prog == '*')
1835                 prog = NULL;
1836         if (prog) {
1837                 f->f_program = strdup(prog);
1838                 if (f->f_program == NULL) {
1839                         logerror("strdup");
1840                         exit(1);
1841                 }
1842         }
1843
1844         /* scan through the list of selectors */
1845         for (p = line; *p && *p != '\t' && *p != ' ';) {
1846                 int pri_done;
1847                 int pri_cmp;
1848                 int pri_invert;
1849
1850                 /* find the end of this facility name list */
1851                 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
1852                         continue;
1853
1854                 /* get the priority comparison */
1855                 pri_cmp = 0;
1856                 pri_done = 0;
1857                 pri_invert = 0;
1858                 if (*q == '!') {
1859                         pri_invert = 1;
1860                         q++;
1861                 }
1862                 while (!pri_done) {
1863                         switch (*q) {
1864                         case '<':
1865                                 pri_cmp |= PRI_LT;
1866                                 q++;
1867                                 break;
1868                         case '=':
1869                                 pri_cmp |= PRI_EQ;
1870                                 q++;
1871                                 break;
1872                         case '>':
1873                                 pri_cmp |= PRI_GT;
1874                                 q++;
1875                                 break;
1876                         default:
1877                                 pri_done++;
1878                                 break;
1879                         }
1880                 }
1881
1882                 /* collect priority name */
1883                 for (bp = buf; *q && !strchr("\t,; ", *q); )
1884                         *bp++ = *q++;
1885                 *bp = '\0';
1886
1887                 /* skip cruft */
1888                 while (strchr(",;", *q))
1889                         q++;
1890
1891                 /* decode priority name */
1892                 if (*buf == '*') {
1893                         pri = LOG_PRIMASK;
1894                         pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
1895                 } else {
1896                         /* Ignore trailing spaces. */
1897                         for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
1898                                 buf[i] = '\0';
1899
1900                         pri = decode(buf, prioritynames);
1901                         if (pri < 0) {
1902                                 snprintf(ebuf, sizeof ebuf,
1903                                     "unknown priority name \"%s\"", buf);
1904                                 logerror(ebuf);
1905                                 return;
1906                         }
1907                 }
1908                 if (!pri_cmp)
1909                         pri_cmp = (UniquePriority)
1910                                   ? (PRI_EQ)
1911                                   : (PRI_EQ | PRI_GT)
1912                                   ;
1913                 if (pri_invert)
1914                         pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
1915
1916                 /* scan facilities */
1917                 while (*p && !strchr("\t.; ", *p)) {
1918                         for (bp = buf; *p && !strchr("\t,;. ", *p); )
1919                                 *bp++ = *p++;
1920                         *bp = '\0';
1921
1922                         if (*buf == '*') {
1923                                 for (i = 0; i < LOG_NFACILITIES; i++) {
1924                                         f->f_pmask[i] = pri;
1925                                         f->f_pcmp[i] = pri_cmp;
1926                                 }
1927                         } else {
1928                                 i = decode(buf, facilitynames);
1929                                 if (i < 0) {
1930                                         snprintf(ebuf, sizeof ebuf,
1931                                             "unknown facility name \"%s\"",
1932                                             buf);
1933                                         logerror(ebuf);
1934                                         return;
1935                                 }
1936                                 f->f_pmask[i >> 3] = pri;
1937                                 f->f_pcmp[i >> 3] = pri_cmp;
1938                         }
1939                         while (*p == ',' || *p == ' ')
1940                                 p++;
1941                 }
1942
1943                 p = q;
1944         }
1945
1946         /* skip to action part */
1947         while (*p == '\t' || *p == ' ')
1948                 p++;
1949
1950         if (*p == '-') {
1951                 syncfile = 0;
1952                 p++;
1953         } else
1954                 syncfile = 1;
1955
1956         switch (*p) {
1957         case '@':
1958                 {
1959                         char *tp;
1960                         /*
1961                          * scan forward to see if there is a port defined.
1962                          * so we can't use strlcpy..
1963                          */
1964                         i = sizeof(f->f_un.f_forw.f_hname);
1965                         tp = f->f_un.f_forw.f_hname;
1966                         p++;
1967
1968                         while (*p && (*p != ':') && (i-- > 0)) {
1969                                 *tp++ = *p++;
1970                         }
1971                         *tp = '\0';
1972                 }
1973                 /* See if we copied a domain and have a port */
1974                 if (*p == ':')
1975                         p++;
1976                 else
1977                         p = NULL;
1978
1979                 memset(&hints, 0, sizeof(hints));
1980                 hints.ai_family = family;
1981                 hints.ai_socktype = SOCK_DGRAM;
1982                 error = getaddrinfo(f->f_un.f_forw.f_hname,
1983                                 p ? p : "syslog", &hints, &res);
1984                 if (error) {
1985                         logerror(gai_strerror(error));
1986                         break;
1987                 }
1988                 f->f_un.f_forw.f_addr = res;
1989                 f->f_type = F_FORW;
1990                 break;
1991
1992         case '/':
1993                 if ((f->f_file = open(p, logflags, 0600)) < 0) {
1994                         f->f_type = F_UNUSED;
1995                         logerror(p);
1996                         break;
1997                 }
1998                 if (syncfile)
1999                         f->f_flags |= FFLAG_SYNC;
2000                 if (isatty(f->f_file)) {
2001                         if (strcmp(p, ctty) == 0)
2002                                 f->f_type = F_CONSOLE;
2003                         else
2004                                 f->f_type = F_TTY;
2005                         strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1,
2006                             sizeof(f->f_un.f_fname));
2007                 } else {
2008                         strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname));
2009                         f->f_type = F_FILE;
2010                 }
2011                 break;
2012
2013         case '%':
2014                 if ((f->f_file = open(p + 1, O_RDWR, 0 )) < 0) {
2015                         f->f_type = F_UNUSED;
2016                         logerror(p + 1);
2017                         break;
2018                 }
2019                 if (fstat(f->f_file,&sb) < 0) {
2020                         close(f->f_file);
2021                         f->f_type = F_UNUSED;
2022                         logerror(p+1);
2023                         break;
2024                 }
2025                 f->f_un.f_ring.f_footer =
2026                         mmap(NULL, sizeof(struct clog_footer),
2027                              PROT_READ|PROT_WRITE, MAP_SHARED,
2028                              f->f_file, sb.st_size-sizeof(struct clog_footer));
2029                 if (f->f_un.f_ring.f_footer == NULL) {
2030                         close(f->f_file);
2031                         f->f_type = F_UNUSED;
2032                         logerror(p + 1);
2033                         break;
2034                 }
2035                 if (memcmp(&(f->f_un.f_ring.f_footer->cf_magic), MAGIC_CONST, 4) != 0) {
2036                         munmap(f->f_un.f_ring.f_footer,
2037                                 sizeof(struct clog_footer));
2038                         close(f->f_file);
2039                         f->f_type = F_UNUSED;
2040                         errno = ENODEV;
2041                         logerror(p + 1);
2042                         break;
2043                 }
2044                 f->f_un.f_ring.f_size = sb.st_size;
2045                 strcpy(f->f_un.f_ring.f_rname, p + 1);
2046                 f->f_type = F_RING;
2047                 break;
2048
2049         case '|':
2050                 f->f_un.f_pipe.f_pid = 0;
2051                 strlcpy(f->f_un.f_pipe.f_pname, p + 1,
2052                     sizeof(f->f_un.f_pipe.f_pname));
2053                 f->f_type = F_PIPE;
2054                 break;
2055
2056         case '*':
2057                 f->f_type = F_WALL;
2058                 break;
2059
2060         default:
2061                 for (i = 0; i < MAXUNAMES && *p; i++) {
2062                         for (q = p; *q && *q != ','; )
2063                                 q++;
2064                         strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE);
2065                         if ((q - p) > UT_NAMESIZE)
2066                                 f->f_un.f_uname[i][UT_NAMESIZE] = '\0';
2067                         else
2068                                 f->f_un.f_uname[i][q - p] = '\0';
2069                         while (*q == ',' || *q == ' ')
2070                                 q++;
2071                         p = q;
2072                 }
2073                 f->f_type = F_USERS;
2074                 break;
2075         }
2076 }
2077
2078
2079 /*
2080  *  Decode a symbolic name to a numeric value
2081  */
2082 static int
2083 decode(const char *name, CODE *codetab)
2084 {
2085         CODE *c;
2086         char *p, buf[40];
2087
2088         if (isdigit(*name))
2089                 return (atoi(name));
2090
2091         for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2092                 if (isupper(*name))
2093                         *p = tolower(*name);
2094                 else
2095                         *p = *name;
2096         }
2097         *p = '\0';
2098         for (c = codetab; c->c_name; c++)
2099                 if (!strcmp(buf, c->c_name))
2100                         return (c->c_val);
2101
2102         return (-1);
2103 }
2104
2105 static void
2106 markit(void)
2107 {
2108         struct filed *f;
2109         dq_t q, next;
2110
2111         now = time(NULL);
2112         MarkSeq += TIMERINTVL;
2113         if (MarkSeq >= MarkInterval) {
2114                 logmsg(LOG_INFO, "-- MARK --",
2115                     LocalHostName, ADDDATE|MARK);
2116                 MarkSeq = 0;
2117         }
2118
2119         for (f = Files; f; f = f->f_next) {
2120                 if (f->f_prevcount && now >= REPEATTIME(f)) {
2121                         dprintf("flush %s: repeated %d times, %d sec.\n",
2122                             TypeNames[f->f_type], f->f_prevcount,
2123                             repeatinterval[f->f_repeatcount]);
2124                         fprintlog(f, 0, NULL);
2125                         BACKOFF(f);
2126                 }
2127         }
2128
2129         /* Walk the dead queue, and see if we should signal somebody. */
2130         for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) {
2131                 next = TAILQ_NEXT(q, dq_entries);
2132
2133                 switch (q->dq_timeout) {
2134                 case 0:
2135                         /* Already signalled once, try harder now. */
2136                         if (kill(q->dq_pid, SIGKILL) != 0)
2137                                 deadq_remove(q->dq_pid);
2138                         break;
2139
2140                 case 1:
2141                         /*
2142                          * Timed out on dead queue, send terminate
2143                          * signal.  Note that we leave the removal
2144                          * from the dead queue to reapchild(), which
2145                          * will also log the event (unless the process
2146                          * didn't even really exist, in case we simply
2147                          * drop it from the dead queue).
2148                          */
2149                         if (kill(q->dq_pid, SIGTERM) != 0)
2150                                 deadq_remove(q->dq_pid);
2151                         /* FALLTHROUGH */
2152
2153                 default:
2154                         q->dq_timeout--;
2155                 }
2156         }
2157         MarkSet = 0;
2158         alarm(TIMERINTVL);
2159 }
2160
2161 /*
2162  * fork off and become a daemon, but wait for the child to come online
2163  * before returing to the parent, or we get disk thrashing at boot etc.
2164  * Set a timer so we don't hang forever if it wedges.
2165  */
2166 static int
2167 waitdaemon(int nochdir, int noclose, int maxwait)
2168 {
2169         int fd;
2170         int status;
2171         pid_t pid, childpid;
2172
2173         switch (childpid = fork()) {
2174         case -1:
2175                 return (-1);
2176         case 0:
2177                 break;
2178         default:
2179                 signal(SIGALRM, timedout);
2180                 alarm(maxwait);
2181                 while ((pid = wait3(&status, 0, NULL)) != -1) {
2182                         if (WIFEXITED(status))
2183                                 errx(1, "child pid %d exited with return code %d",
2184                                         pid, WEXITSTATUS(status));
2185                         if (WIFSIGNALED(status))
2186                                 errx(1, "child pid %d exited on signal %d%s",
2187                                         pid, WTERMSIG(status),
2188                                         WCOREDUMP(status) ? " (core dumped)" :
2189                                         "");
2190                         if (pid == childpid)    /* it's gone... */
2191                                 break;
2192                 }
2193                 exit(0);
2194         }
2195
2196         if (setsid() == -1)
2197                 return (-1);
2198
2199         if (!nochdir)
2200                 chdir("/");
2201
2202         if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2203                 dup2(fd, STDIN_FILENO);
2204                 dup2(fd, STDOUT_FILENO);
2205                 dup2(fd, STDERR_FILENO);
2206                 if (fd > 2)
2207                         close (fd);
2208         }
2209         return (getppid());
2210 }
2211
2212 /*
2213  * We get a SIGALRM from the child when it's running and finished doing it's
2214  * fsync()'s or O_SYNC writes for all the boot messages.
2215  *
2216  * We also get a signal from the kernel if the timer expires, so check to
2217  * see what happened.
2218  */
2219 static void
2220 timedout(int sig __unused)
2221 {
2222         int left;
2223         left = alarm(0);
2224         signal(SIGALRM, SIG_DFL);
2225         if (left == 0)
2226                 errx(1, "timed out waiting for child");
2227         else
2228                 _exit(0);
2229 }
2230
2231 /*
2232  * Add `s' to the list of allowable peer addresses to accept messages
2233  * from.
2234  *
2235  * `s' is a string in the form:
2236  *
2237  *    [*]domainname[:{servicename|portnumber|*}]
2238  *
2239  * or
2240  *
2241  *    netaddr/maskbits[:{servicename|portnumber|*}]
2242  *
2243  * Returns -1 on error, 0 if the argument was valid.
2244  */
2245 static int
2246 allowaddr(char *s)
2247 {
2248         char *cp1, *cp2;
2249         struct allowedpeer ap;
2250         struct servent *se;
2251         int masklen = -1;
2252         struct addrinfo hints, *res;
2253         struct in_addr *addrp, *maskp;
2254 #ifdef INET6
2255         int i;
2256         u_int32_t *addr6p, *mask6p;
2257 #endif
2258         char ip[NI_MAXHOST];
2259
2260 #ifdef INET6
2261         if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2262 #endif
2263                 cp1 = s;
2264         if ((cp1 = strrchr(cp1, ':'))) {
2265                 /* service/port provided */
2266                 *cp1++ = '\0';
2267                 if (strlen(cp1) == 1 && *cp1 == '*')
2268                         /* any port allowed */
2269                         ap.port = 0;
2270                 else if ((se = getservbyname(cp1, "udp"))) {
2271                         ap.port = ntohs(se->s_port);
2272                 } else {
2273                         ap.port = strtol(cp1, &cp2, 0);
2274                         if (*cp2 != '\0')
2275                                 return (-1); /* port not numeric */
2276                 }
2277         } else {
2278                 if ((se = getservbyname("syslog", "udp")))
2279                         ap.port = ntohs(se->s_port);
2280                 else
2281                         /* sanity, should not happen */
2282                         ap.port = 514;
2283         }
2284
2285         if ((cp1 = strchr(s, '/')) != NULL &&
2286             strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2287                 *cp1 = '\0';
2288                 if ((masklen = atoi(cp1 + 1)) < 0)
2289                         return (-1);
2290         }
2291 #ifdef INET6
2292         if (*s == '[') {
2293                 cp2 = s + strlen(s) - 1;
2294                 if (*cp2 == ']') {
2295                         ++s;
2296                         *cp2 = '\0';
2297                 } else {
2298                         cp2 = NULL;
2299                 }
2300         } else {
2301                 cp2 = NULL;
2302         }
2303 #endif
2304         memset(&hints, 0, sizeof(hints));
2305         hints.ai_family = PF_UNSPEC;
2306         hints.ai_socktype = SOCK_DGRAM;
2307         hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2308         if (getaddrinfo(s, NULL, &hints, &res) == 0) {
2309                 ap.isnumeric = 1;
2310                 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen);
2311                 memset(&ap.a_mask, 0, sizeof(ap.a_mask));
2312                 ap.a_mask.ss_family = res->ai_family;
2313                 if (res->ai_family == AF_INET) {
2314                         ap.a_mask.ss_len = sizeof(struct sockaddr_in);
2315                         maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr;
2316                         addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr;
2317                         if (masklen < 0) {
2318                                 /* use default netmask */
2319                                 if (IN_CLASSA(ntohl(addrp->s_addr)))
2320                                         maskp->s_addr = htonl(IN_CLASSA_NET);
2321                                 else if (IN_CLASSB(ntohl(addrp->s_addr)))
2322                                         maskp->s_addr = htonl(IN_CLASSB_NET);
2323                                 else
2324                                         maskp->s_addr = htonl(IN_CLASSC_NET);
2325                         } else if (masklen <= 32) {
2326                                 /* convert masklen to netmask */
2327                                 if (masklen == 0)
2328                                         maskp->s_addr = 0;
2329                                 else
2330                                         maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1));
2331                         } else {
2332                                 freeaddrinfo(res);
2333                                 return (-1);
2334                         }
2335                         /* Lose any host bits in the network number. */
2336                         addrp->s_addr &= maskp->s_addr;
2337                 }
2338 #ifdef INET6
2339                 else if (res->ai_family == AF_INET6 && masklen <= 128) {
2340                         ap.a_mask.ss_len = sizeof(struct sockaddr_in6);
2341                         if (masklen < 0)
2342                                 masklen = 128;
2343                         mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2344                         /* convert masklen to netmask */
2345                         while (masklen > 0) {
2346                                 if (masklen < 32) {
2347                                         *mask6p = htonl(~(0xffffffff >> masklen));
2348                                         break;
2349                                 }
2350                                 *mask6p++ = 0xffffffff;
2351                                 masklen -= 32;
2352                         }
2353                         /* Lose any host bits in the network number. */
2354                         mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr;
2355                         addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr;
2356                         for (i = 0; i < 4; i++)
2357                                 addr6p[i] &= mask6p[i];
2358                 }
2359 #endif
2360                 else {
2361                         freeaddrinfo(res);
2362                         return (-1);
2363                 }
2364                 freeaddrinfo(res);
2365         } else {
2366                 /* arg `s' is domain name */
2367                 ap.isnumeric = 0;
2368                 ap.a_name = s;
2369                 if (cp1)
2370                         *cp1 = '/';
2371 #ifdef INET6
2372                 if (cp2) {
2373                         *cp2 = ']';
2374                         --s;
2375                 }
2376 #endif
2377         }
2378
2379         if (Debug) {
2380                 printf("allowaddr: rule %d: ", NumAllowed);
2381                 if (ap.isnumeric) {
2382                         printf("numeric, ");
2383                         getnameinfo((struct sockaddr *)&ap.a_addr,
2384                                     ((struct sockaddr *)&ap.a_addr)->sa_len,
2385                                     ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2386                         printf("addr = %s, ", ip);
2387                         getnameinfo((struct sockaddr *)&ap.a_mask,
2388                                     ((struct sockaddr *)&ap.a_mask)->sa_len,
2389                                     ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
2390                         printf("mask = %s; ", ip);
2391                 } else {
2392                         printf("domainname = %s; ", ap.a_name);
2393                 }
2394                 printf("port = %d\n", ap.port);
2395         }
2396
2397         if ((AllowedPeers = realloc(AllowedPeers,
2398                                     ++NumAllowed * sizeof(struct allowedpeer)))
2399             == NULL) {
2400                 logerror("realloc");
2401                 exit(1);
2402         }
2403         memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer));
2404         return (0);
2405 }
2406
2407 /*
2408  * Validate that the remote peer has permission to log to us.
2409  */
2410 static int
2411 validate(struct sockaddr *sa, const char *hname)
2412 {
2413         int i;
2414         size_t l1, l2;
2415         char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
2416         struct allowedpeer *ap;
2417         struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
2418 #ifdef INET6
2419         int j, reject;
2420         struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
2421 #endif
2422         struct addrinfo hints, *res;
2423         u_short sport;
2424
2425         if (NumAllowed == 0)
2426                 /* traditional behaviour, allow everything */
2427                 return (1);
2428
2429         strlcpy(name, hname, sizeof(name));
2430         memset(&hints, 0, sizeof(hints));
2431         hints.ai_family = PF_UNSPEC;
2432         hints.ai_socktype = SOCK_DGRAM;
2433         hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;
2434         if (getaddrinfo(name, NULL, &hints, &res) == 0)
2435                 freeaddrinfo(res);
2436         else if (strchr(name, '.') == NULL) {
2437                 strlcat(name, ".", sizeof name);
2438                 strlcat(name, LocalDomain, sizeof name);
2439         }
2440         if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port,
2441                         NI_NUMERICHOST | NI_NUMERICSERV) != 0)
2442                 return (0);     /* for safety, should not occur */
2443         dprintf("validate: dgram from IP %s, port %s, name %s;\n",
2444                 ip, port, name);
2445         sport = atoi(port);
2446
2447         /* now, walk down the list */
2448         for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) {
2449                 if (ap->port != 0 && ap->port != sport) {
2450                         dprintf("rejected in rule %d due to port mismatch.\n", i);
2451                         continue;
2452                 }
2453
2454                 if (ap->isnumeric) {
2455                         if (ap->a_addr.ss_family != sa->sa_family) {
2456                                 dprintf("rejected in rule %d due to address family mismatch.\n", i);
2457                                 continue;
2458                         }
2459                         if (ap->a_addr.ss_family == AF_INET) {
2460                                 sin4 = (struct sockaddr_in *)sa;
2461                                 a4p = (struct sockaddr_in *)&ap->a_addr;
2462                                 m4p = (struct sockaddr_in *)&ap->a_mask;
2463                                 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
2464                                     != a4p->sin_addr.s_addr) {
2465                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
2466                                         continue;
2467                                 }
2468                         }
2469 #ifdef INET6
2470                         else if (ap->a_addr.ss_family == AF_INET6) {
2471                                 sin6 = (struct sockaddr_in6 *)sa;
2472                                 a6p = (struct sockaddr_in6 *)&ap->a_addr;
2473                                 m6p = (struct sockaddr_in6 *)&ap->a_mask;
2474                                 if (a6p->sin6_scope_id != 0 &&
2475                                     sin6->sin6_scope_id != a6p->sin6_scope_id) {
2476                                         dprintf("rejected in rule %d due to scope mismatch.\n", i);
2477                                         continue;
2478                                 }
2479                                 reject = 0;
2480                                 for (j = 0; j < 16; j += 4) {
2481                                         if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j])
2482                                             != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) {
2483                                                 ++reject;
2484                                                 break;
2485                                         }
2486                                 }
2487                                 if (reject) {
2488                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
2489                                         continue;
2490                                 }
2491                         }
2492 #endif
2493                         else
2494                                 continue;
2495                 } else {
2496                         cp = ap->a_name;
2497                         l1 = strlen(name);
2498                         if (*cp == '*') {
2499                                 /* allow wildmatch */
2500                                 cp++;
2501                                 l2 = strlen(cp);
2502                                 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) {
2503                                         dprintf("rejected in rule %d due to name mismatch.\n", i);
2504                                         continue;
2505                                 }
2506                         } else {
2507                                 /* exact match */
2508                                 l2 = strlen(cp);
2509                                 if (l2 != l1 || memcmp(cp, name, l1) != 0) {
2510                                         dprintf("rejected in rule %d due to name mismatch.\n", i);
2511                                         continue;
2512                                 }
2513                         }
2514                 }
2515                 dprintf("accepted in rule %d.\n", i);
2516                 return (1);     /* hooray! */
2517         }
2518         return (0);
2519 }
2520
2521 /*
2522  * Fairly similar to popen(3), but returns an open descriptor, as
2523  * opposed to a FILE *.
2524  */
2525 static int
2526 p_open(const char *prog, pid_t *rpid)
2527 {
2528         int pfd[2], nulldesc, i;
2529         pid_t pid;
2530         sigset_t omask, mask;
2531         char *argv[4]; /* sh -c cmd NULL */
2532         char errmsg[200];
2533
2534         if (pipe(pfd) == -1)
2535                 return (-1);
2536         if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
2537                 /* we are royally screwed anyway */
2538                 return (-1);
2539
2540         sigemptyset(&mask);
2541         sigaddset(&mask, SIGALRM);
2542         sigaddset(&mask, SIGHUP);
2543         sigprocmask(SIG_BLOCK, &mask, &omask);
2544         switch ((pid = fork())) {
2545         case -1:
2546                 sigprocmask(SIG_SETMASK, &omask, 0);
2547                 close(nulldesc);
2548                 return (-1);
2549
2550         case 0:
2551                 argv[0] = strdup("sh");
2552                 argv[1] = strdup("-c");
2553                 argv[2] = strdup(prog);
2554                 argv[3] = NULL;
2555                 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
2556                         logerror("strdup");
2557                         exit(1);
2558                 }
2559
2560                 alarm(0);
2561                 setsid();       /* Avoid catching SIGHUPs. */
2562
2563                 /*
2564                  * Throw away pending signals, and reset signal
2565                  * behaviour to standard values.
2566                  */
2567                 signal(SIGALRM, SIG_IGN);
2568                 signal(SIGHUP, SIG_IGN);
2569                 sigprocmask(SIG_SETMASK, &omask, 0);
2570                 signal(SIGPIPE, SIG_DFL);
2571                 signal(SIGQUIT, SIG_DFL);
2572                 signal(SIGALRM, SIG_DFL);
2573                 signal(SIGHUP, SIG_DFL);
2574
2575                 dup2(pfd[0], STDIN_FILENO);
2576                 dup2(nulldesc, STDOUT_FILENO);
2577                 dup2(nulldesc, STDERR_FILENO);
2578                 for (i = getdtablesize(); i > 2; i--)
2579                         close(i);
2580
2581                 execvp(_PATH_BSHELL, argv);
2582                 _exit(255);
2583         }
2584
2585         sigprocmask(SIG_SETMASK, &omask, 0);
2586         close(nulldesc);
2587         close(pfd[0]);
2588         /*
2589          * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
2590          * supposed to get an EWOULDBLOCK on writev(2), which is
2591          * caught by the logic above anyway, which will in turn close
2592          * the pipe, and fork a new logging subprocess if necessary.
2593          * The stale subprocess will be killed some time later unless
2594          * it terminated itself due to closing its input pipe (so we
2595          * get rid of really dead puppies).
2596          */
2597         if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
2598                 /* This is bad. */
2599                 snprintf(errmsg, sizeof errmsg,
2600                                "Warning: cannot change pipe to PID %d to "
2601                                "non-blocking behaviour.",
2602                                (int)pid);
2603                 logerror(errmsg);
2604         }
2605         *rpid = pid;
2606         return (pfd[1]);
2607 }
2608
2609 static void
2610 deadq_enter(pid_t pid, const char *name)
2611 {
2612         dq_t p;
2613         int status;
2614
2615         /*
2616          * Be paranoid, if we can't signal the process, don't enter it
2617          * into the dead queue (perhaps it's already dead).  If possible,
2618          * we try to fetch and log the child's status.
2619          */
2620         if (kill(pid, 0) != 0) {
2621                 if (waitpid(pid, &status, WNOHANG) > 0)
2622                         log_deadchild(pid, status, name);
2623                 return;
2624         }
2625
2626         p = malloc(sizeof(struct deadq_entry));
2627         if (p == NULL) {
2628                 logerror("malloc");
2629                 exit(1);
2630         }
2631
2632         p->dq_pid = pid;
2633         p->dq_timeout = DQ_TIMO_INIT;
2634         TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries);
2635 }
2636
2637 static int
2638 deadq_remove(pid_t pid)
2639 {
2640         dq_t q;
2641
2642         TAILQ_FOREACH(q, &deadq_head, dq_entries) {
2643                 if (q->dq_pid == pid) {
2644                         TAILQ_REMOVE(&deadq_head, q, dq_entries);
2645                                 free(q);
2646                                 return (1);
2647                 }
2648         }
2649
2650         return (0);
2651 }
2652
2653 static void
2654 log_deadchild(pid_t pid, int status, const char *name)
2655 {
2656         int code;
2657         char buf[256];
2658         const char *reason;
2659
2660         errno = 0; /* Keep strerror() stuff out of logerror messages. */
2661         if (WIFSIGNALED(status)) {
2662                 reason = "due to signal";
2663                 code = WTERMSIG(status);
2664         } else {
2665                 reason = "with status";
2666                 code = WEXITSTATUS(status);
2667                 if (code == 0)
2668                         return;
2669         }
2670         snprintf(buf, sizeof buf,
2671                        "Logging subprocess %d (%s) exited %s %d.",
2672                        pid, name, reason, code);
2673         logerror(buf);
2674 }
2675
2676 static int *
2677 socksetup(int af, const char *bindhostname)
2678 {
2679         struct addrinfo hints, *res, *r;
2680         int error, maxs, *s, *socks;
2681
2682         memset(&hints, 0, sizeof(hints));
2683         hints.ai_flags = AI_PASSIVE;
2684         hints.ai_family = af;
2685         hints.ai_socktype = SOCK_DGRAM;
2686         error = getaddrinfo(bindhostname, "syslog", &hints, &res);
2687         if (error) {
2688                 logerror(gai_strerror(error));
2689                 errno = 0;
2690                 die(0);
2691         }
2692
2693         /* Count max number of sockets we may open */
2694         for (maxs = 0, r = res; r; r = r->ai_next, maxs++);
2695         socks = malloc((maxs+1) * sizeof(int));
2696         if (socks == NULL) {
2697                 logerror("couldn't allocate memory for sockets");
2698                 die(0);
2699         }
2700
2701         *socks = 0;   /* num of sockets counter at start of array */
2702         s = socks + 1;
2703         for (r = res; r; r = r->ai_next) {
2704                 int on = 1;
2705                 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
2706                 if (*s < 0) {
2707                         logerror("socket");
2708                         continue;
2709                 }
2710                 if (r->ai_family == AF_INET6) {
2711                         if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
2712                                        (char *)&on, sizeof (on)) < 0) {
2713                                 logerror("setsockopt");
2714                                 close(*s);
2715                                 continue;
2716                         }
2717                 }
2718                 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
2719                                (char *)&on, sizeof (on)) < 0) {
2720                         logerror("setsockopt");
2721                         close(*s);
2722                         continue;
2723                 }
2724                 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
2725                         close(*s);
2726                         logerror("bind");
2727                         continue;
2728                 }
2729
2730                 double_rbuf(*s);
2731
2732                 (*socks)++;
2733                 s++;
2734         }
2735
2736         if (*socks == 0) {
2737                 free(socks);
2738                 if (Debug)
2739                         return (NULL);
2740                 else
2741                         die(0);
2742         }
2743         if (res)
2744                 freeaddrinfo(res);
2745
2746         return (socks);
2747 }
2748
2749 ssize_t
2750 rbwritev(struct filed *f, struct iovec *iov, int iovcnt)
2751 {
2752         int i;
2753         ssize_t out = 0;
2754         ssize_t error;
2755
2756         for (i = 0; i < iovcnt; i++) {
2757                 error = rbwrite(f, iov[i].iov_base, iov[i].iov_len);
2758                 if (error == -1)
2759                         return (-1);
2760                 out += error;
2761         }
2762         return (out);
2763 }
2764
2765
2766 ssize_t
2767 rbwrite(struct filed *f, char *buf, size_t nbytes)
2768 {
2769         size_t maxwrite;
2770         ssize_t error;
2771         ssize_t out;
2772
2773         maxwrite = f->f_un.f_ring.f_footer->cf_max -
2774                    f->f_un.f_ring.f_footer->cf_next;
2775         out = 0;
2776
2777         f->f_un.f_ring.f_footer->cf_lock = 1;
2778         while (nbytes > 0) {
2779                 maxwrite = f->f_un.f_ring.f_footer->cf_max -
2780                            f->f_un.f_ring.f_footer->cf_next;
2781                 if (maxwrite > nbytes)
2782                         maxwrite = nbytes;
2783                 error = pwrite(f->f_file, buf, maxwrite,
2784                                f->f_un.f_ring.f_footer->cf_next);
2785                 if (error == -1) {
2786                         f->f_un.f_ring.f_footer->cf_lock = 0;
2787                         return (-1);
2788                 }
2789                 nbytes -= error;
2790                 out += error;
2791                 buf += error;
2792                 f->f_un.f_ring.f_footer->cf_next += error;
2793                 if (f->f_un.f_ring.f_footer->cf_next ==
2794                     f->f_un.f_ring.f_footer->cf_max) {
2795                         f->f_un.f_ring.f_footer->cf_next = 0;
2796                         f->f_un.f_ring.f_footer->cf_wrap = 1;
2797                 }
2798         }
2799
2800         f->f_un.f_ring.f_footer->cf_lock = 0;
2801         return (out);
2802 }
2803
2804 static void
2805 double_rbuf(int fd)
2806 {
2807         socklen_t slen, len;
2808
2809         if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) {
2810                 len *= 2;
2811                 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen);
2812         }
2813 }