usr.sbin/syslogd/syslogd.c

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