usr.sbin/newsyslog/newsyslog.c

   1 /*-
   2  * ------+---------+---------+-------- + --------+---------+---------+---------*
   3  * This file includes significant modifications done by:
   4  * Copyright (c) 2003, 2004  - Garance Alistair Drosehn <gad@FreeBSD.org>.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *   1. Redistributions of source code must retain the above copyright
  11  *      notice, this list of conditions and the following disclaimer.
  12  *   2. Redistributions in binary form must reproduce the above copyright
  13  *      notice, this list of conditions and the following disclaimer in the
  14  *      documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * ------+---------+---------+-------- + --------+---------+---------+---------*
  29  */
  30
  31 /*
  32  * This file contains changes from the Open Software Foundation.
  33  */
  34
  35 /*
  36  * Copyright 1988, 1989 by the Massachusetts Institute of Technology
  37  *
  38  * Permission to use, copy, modify, and distribute this software and its
  39  * documentation for any purpose and without fee is hereby granted, provided
  40  * that the above copyright notice appear in all copies and that both that
  41  * copyright notice and this permission notice appear in supporting
  42  * documentation, and that the names of M.I.T. and the M.I.T. S.I.P.B. not be
  43  * used in advertising or publicity pertaining to distribution of the
  44  * software without specific, written prior permission. M.I.T. and the M.I.T.
  45  * S.I.P.B. make no representations about the suitability of this software
  46  * for any purpose.  It is provided "as is" without express or implied
  47  * warranty.
  48  *
  49  */
  50
  51 /*
  52  * newsyslog - roll over selected logs at the appropriate time, keeping the a
  53  * specified number of backup files around.
  54  */
  55
  56 #include <sys/cdefs.h>
  57 __FBSDID("$FreeBSD$");
  58
  59 #define OSF
  60 #ifndef COMPRESS_POSTFIX
  61 #define COMPRESS_POSTFIX ".gz"
  62 #endif
  63 #ifndef BZCOMPRESS_POSTFIX
  64 #define BZCOMPRESS_POSTFIX ".bz2"
  65 #endif
  66
  67 #include <sys/param.h>
  68 #include <sys/queue.h>
  69 #include <sys/stat.h>
  70 #include <sys/wait.h>
  71
  72 #include <ctype.h>
  73 #include <err.h>
  74 #include <errno.h>
  75 #include <fcntl.h>
  76 #include <fnmatch.h>
  77 #include <glob.h>
  78 #include <grp.h>
  79 #include <paths.h>
  80 #include <pwd.h>
  81 #include <signal.h>
  82 #include <stdio.h>
  83 #include <stdlib.h>
  84 #include <string.h>
  85 #include <time.h>
  86 #include <unistd.h>
  87
  88 #include "pathnames.h"
  89 #include "extern.h"
  90
  91 /*
  92  * Bit-values for the 'flags' parsed from a config-file entry.
  93  */
  94 #define CE_COMPACT      0x0001  /* Compact the archived log files with gzip. */
  95 #define CE_BZCOMPACT    0x0002  /* Compact the archived log files with bzip2. */
  96 #define CE_BINARY       0x0008  /* Logfile is in binary, do not add status */
  97                                 /*    messages to logfile(s) when rotating. */
  98 #define CE_NOSIGNAL     0x0010  /* There is no process to signal when */
  99                                 /*    trimming this file. */
 100 #define CE_TRIMAT       0x0020  /* trim file at a specific time. */
 101 #define CE_GLOB         0x0040  /* name of the log is file name pattern. */
 102 #define CE_SIGNALGROUP  0x0080  /* Signal a process-group instead of a single */
 103                                 /*    process when trimming this file. */
 104 #define CE_CREATE       0x0100  /* Create the log file if it does not exist. */
 105 #define CE_NODUMP       0x0200  /* Set 'nodump' on newly created log file. */
 106
 107 #define MIN_PID         5       /* Don't touch pids lower than this */
 108 #define MAX_PID         99999   /* was lower, see /usr/include/sys/proc.h */
 109
 110 #define kbytes(size)  (((size) + 1023) >> 10)
 111
 112 #define DEFAULT_MARKER  "<default>"
 113 #define DEBUG_MARKER    "<debug>"
 114
 115 struct conf_entry {
 116         char *log;              /* Name of the log */
 117         char *pid_file;         /* PID file */
 118         char *r_reason;         /* The reason this file is being rotated */
 119         int firstcreate;        /* Creating log for the first time (-C). */
 120         int rotate;             /* Non-zero if this file should be rotated */
 121         int fsize;              /* size found for the log file */
 122         uid_t uid;              /* Owner of log */
 123         gid_t gid;              /* Group of log */
 124         int numlogs;            /* Number of logs to keep */
 125         int trsize;             /* Size cutoff to trigger trimming the log */
 126         int hours;              /* Hours between log trimming */
 127         struct ptime_data *trim_at;     /* Specific time to do trimming */
 128         unsigned int permissions;       /* File permissions on the log */
 129         int flags;              /* CE_COMPACT, CE_BZCOMPACT, CE_BINARY */
 130         int sig;                /* Signal to send */
 131         int def_cfg;            /* Using the <default> rule for this file */
 132         struct conf_entry *next;/* Linked list pointer */
 133 };
 134
 135 struct sigwork_entry {
 136         SLIST_ENTRY(sigwork_entry) sw_nextp;
 137         int      sw_signum;             /* the signal to send */
 138         int      sw_pidok;              /* true if pid value is valid */
 139         pid_t    sw_pid;                /* the process id from the PID file */
 140         const char *sw_pidtype;         /* "daemon" or "process group" */
 141         char     sw_fname[1];           /* file the PID was read from */
 142 };
 143
 144 struct zipwork_entry {
 145         SLIST_ENTRY(zipwork_entry) zw_nextp;
 146         const struct conf_entry *zw_conf;       /* for chown/perm/flag info */
 147         const struct sigwork_entry *zw_swork;   /* to know success of signal */
 148         int      zw_fsize;              /* size of the file to compress */
 149         char     zw_fname[1];           /* the file to compress */
 150 };
 151
 152 typedef enum {
 153         FREE_ENT, KEEP_ENT
 154 }       fk_entry;
 155
 156 SLIST_HEAD(swlisthead, sigwork_entry) swhead = SLIST_HEAD_INITIALIZER(swhead);
 157 SLIST_HEAD(zwlisthead, zipwork_entry) zwhead = SLIST_HEAD_INITIALIZER(zwhead);
 158
 159 int dbg_at_times;               /* -D Show details of 'trim_at' code */
 160
 161 int archtodir = 0;              /* Archive old logfiles to other directory */
 162 int createlogs;                 /* Create (non-GLOB) logfiles which do not */
 163                                 /*    already exist.  1=='for entries with */
 164                                 /*    C flag', 2=='for all entries'. */
 165 int verbose = 0;                /* Print out what's going on */
 166 int needroot = 1;               /* Root privs are necessary */
 167 int noaction = 0;               /* Don't do anything, just show it */
 168 int norotate = 0;               /* Don't rotate */
 169 int nosignal;                   /* Do not send any signals */
 170 int force = 0;                  /* Force the trim no matter what */
 171 int rotatereq = 0;              /* -R = Always rotate the file(s) as given */
 172                                 /*    on the command (this also requires   */
 173                                 /*    that a list of files *are* given on  */
 174                                 /*    the run command). */
 175 char *requestor;                /* The name given on a -R request */
 176 char *archdirname;              /* Directory path to old logfiles archive */
 177 char *destdir = NULL;           /* Directory to treat at root for logs */
 178 const char *conf;               /* Configuration file to use */
 179
 180 struct ptime_data *dbg_timenow; /* A "timenow" value set via -D option */
 181 struct ptime_data *timenow;     /* The time to use for checking at-fields */
 182
 183 #define DAYTIME_LEN     16
 184 char daytime[DAYTIME_LEN];      /* The current time in human readable form,
 185                                  * used for rotation-tracking messages. */
 186 char hostname[MAXHOSTNAMELEN];  /* hostname */
 187
 188 static struct conf_entry *get_worklist(char **files);
 189 static void parse_file(FILE *cf, const char *cfname, struct conf_entry **work_p,
 190                 struct conf_entry **glob_p, struct conf_entry **defconf_p);
 191 static char *sob(char *p);
 192 static char *son(char *p);
 193 static int isnumberstr(const char *);
 194 static char *missing_field(char *p, char *errline);
 195 static void      change_attrs(const char *, const struct conf_entry *);
 196 static fk_entry  do_entry(struct conf_entry *);
 197 static fk_entry  do_rotate(const struct conf_entry *);
 198 static void      do_sigwork(struct sigwork_entry *);
 199 static void      do_zipwork(struct zipwork_entry *);
 200 static struct sigwork_entry *
 201                  save_sigwork(const struct conf_entry *);
 202 static struct zipwork_entry *
 203                  save_zipwork(const struct conf_entry *, const struct
 204                     sigwork_entry *, int, const char *);
 205 static void      set_swpid(struct sigwork_entry *, const struct conf_entry *);
 206 static int       sizefile(const char *);
 207 static void expand_globs(struct conf_entry **work_p,
 208                 struct conf_entry **glob_p);
 209 static void free_clist(struct conf_entry **firstent);
 210 static void free_entry(struct conf_entry *ent);
 211 static struct conf_entry *init_entry(const char *fname,
 212                 struct conf_entry *src_entry);
 213 static void parse_args(int argc, char **argv);
 214 static int parse_doption(const char *doption);
 215 static void usage(void);
 216 static int log_trim(const char *logname, const struct conf_entry *log_ent);
 217 static int age_old_log(char *file);
 218 static void savelog(char *from, char *to);
 219 static void createdir(const struct conf_entry *ent, char *dirpart);
 220 static void createlog(const struct conf_entry *ent);
 221
 222 /*
 223  * All the following take a parameter of 'int', but expect values in the
 224  * range of unsigned char.  Define wrappers which take values of type 'char',
 225  * whether signed or unsigned, and ensure they end up in the right range.
 226  */
 227 #define isdigitch(Anychar) isdigit((u_char)(Anychar))
 228 #define isprintch(Anychar) isprint((u_char)(Anychar))
 229 #define isspacech(Anychar) isspace((u_char)(Anychar))
 230 #define tolowerch(Anychar) tolower((u_char)(Anychar))
 231
 232 int
 233 main(int argc, char **argv)
 234 {
 235         fk_entry free_or_keep;
 236         struct conf_entry *p, *q;
 237         struct sigwork_entry *stmp;
 238         struct zipwork_entry *ztmp;
 239
 240         SLIST_INIT(&swhead);
 241         SLIST_INIT(&zwhead);
 242
 243         parse_args(argc, argv);
 244         argc -= optind;
 245         argv += optind;
 246
 247         if (needroot && getuid() && geteuid())
 248                 errx(1, "must have root privs");
 249         p = q = get_worklist(argv);
 250
 251         /*
 252          * Rotate all the files which need to be rotated.  Note that
 253          * some users have *hundreds* of entries in newsyslog.conf!
 254          */
 255         while (p) {
 256                 free_or_keep = do_entry(p);
 257                 p = p->next;
 258                 if (free_or_keep == FREE_ENT)
 259                         free_entry(q);
 260                 q = p;
 261         }
 262
 263         /*
 264          * Send signals to any processes which need a signal to tell
 265          * them to close and re-open the log file(s) we have rotated.
 266          * Note that zipwork_entries include pointers to these
 267          * sigwork_entry's, so we can not free the entries here.
 268          */
 269         if (!SLIST_EMPTY(&swhead)) {
 270                 if (noaction || verbose)
 271                         printf("Signal all daemon process(es)...\n");
 272                 SLIST_FOREACH(stmp, &swhead, sw_nextp)
 273                         do_sigwork(stmp);
 274                 if (noaction)
 275                         printf("\tsleep 10\n");
 276                 else {
 277                         if (verbose)
 278                                 printf("Pause 10 seconds to allow daemon(s)"
 279                                     " to close log file(s)\n");
 280                         sleep(10);
 281                 }
 282         }
 283         /*
 284          * Compress all files that we're expected to compress, now
 285          * that all processes should have closed the files which
 286          * have been rotated.
 287          */
 288         if (!SLIST_EMPTY(&zwhead)) {
 289                 if (noaction || verbose)
 290                         printf("Compress all rotated log file(s)...\n");
 291                 while (!SLIST_EMPTY(&zwhead)) {
 292                         ztmp = SLIST_FIRST(&zwhead);
 293                         do_zipwork(ztmp);
 294                         SLIST_REMOVE_HEAD(&zwhead, zw_nextp);
 295                         free(ztmp);
 296                 }
 297         }
 298         /* Now free all the sigwork entries. */
 299         while (!SLIST_EMPTY(&swhead)) {
 300                 stmp = SLIST_FIRST(&swhead);
 301                 SLIST_REMOVE_HEAD(&swhead, sw_nextp);
 302                 free(stmp);
 303         }
 304
 305         while (wait(NULL) > 0 || errno == EINTR)
 306                 ;
 307         return (0);
 308 }
 309
 310 static struct conf_entry *
 311 init_entry(const char *fname, struct conf_entry *src_entry)
 312 {
 313         struct conf_entry *tempwork;
 314
 315         if (verbose > 4)
 316                 printf("\t--> [creating entry for %s]\n", fname);
 317
 318         tempwork = malloc(sizeof(struct conf_entry));
 319         if (tempwork == NULL)
 320                 err(1, "malloc of conf_entry for %s", fname);
 321
 322         if (destdir == NULL || fname[0] != '/')
 323                 tempwork->log = strdup(fname);
 324         else
 325                 asprintf(&tempwork->log, "%s%s", destdir, fname);
 326         if (tempwork->log == NULL)
 327                 err(1, "strdup for %s", fname);
 328
 329         if (src_entry != NULL) {
 330                 tempwork->pid_file = NULL;
 331                 if (src_entry->pid_file)
 332                         tempwork->pid_file = strdup(src_entry->pid_file);
 333                 tempwork->r_reason = NULL;
 334                 tempwork->firstcreate = 0;
 335                 tempwork->rotate = 0;
 336                 tempwork->fsize = -1;
 337                 tempwork->uid = src_entry->uid;
 338                 tempwork->gid = src_entry->gid;
 339                 tempwork->numlogs = src_entry->numlogs;
 340                 tempwork->trsize = src_entry->trsize;
 341                 tempwork->hours = src_entry->hours;
 342                 tempwork->trim_at = NULL;
 343                 if (src_entry->trim_at != NULL)
 344                         tempwork->trim_at = ptime_init(src_entry->trim_at);
 345                 tempwork->permissions = src_entry->permissions;
 346                 tempwork->flags = src_entry->flags;
 347                 tempwork->sig = src_entry->sig;
 348                 tempwork->def_cfg = src_entry->def_cfg;
 349         } else {
 350                 /* Initialize as a "do-nothing" entry */
 351                 tempwork->pid_file = NULL;
 352                 tempwork->r_reason = NULL;
 353                 tempwork->firstcreate = 0;
 354                 tempwork->rotate = 0;
 355                 tempwork->fsize = -1;
 356                 tempwork->uid = (uid_t)-1;
 357                 tempwork->gid = (gid_t)-1;
 358                 tempwork->numlogs = 1;
 359                 tempwork->trsize = -1;
 360                 tempwork->hours = -1;
 361                 tempwork->trim_at = NULL;
 362                 tempwork->permissions = 0;
 363                 tempwork->flags = 0;
 364                 tempwork->sig = SIGHUP;
 365                 tempwork->def_cfg = 0;
 366         }
 367         tempwork->next = NULL;
 368
 369         return (tempwork);
 370 }
 371
 372 static void
 373 free_entry(struct conf_entry *ent)
 374 {
 375
 376         if (ent == NULL)
 377                 return;
 378
 379         if (ent->log != NULL) {
 380                 if (verbose > 4)
 381                         printf("\t--> [freeing entry for %s]\n", ent->log);
 382                 free(ent->log);
 383                 ent->log = NULL;
 384         }
 385
 386         if (ent->pid_file != NULL) {
 387                 free(ent->pid_file);
 388                 ent->pid_file = NULL;
 389         }
 390
 391         if (ent->r_reason != NULL) {
 392                 free(ent->r_reason);
 393                 ent->r_reason = NULL;
 394         }
 395
 396         if (ent->trim_at != NULL) {
 397                 ptime_free(ent->trim_at);
 398                 ent->trim_at = NULL;
 399         }
 400
 401         free(ent);
 402 }
 403
 404 static void
 405 free_clist(struct conf_entry **firstent)
 406 {
 407         struct conf_entry *ent, *nextent;
 408
 409         if (firstent == NULL)
 410                 return;                 /* There is nothing to do. */
 411
 412         ent = *firstent;
 413         firstent = NULL;
 414
 415         while (ent) {
 416                 nextent = ent->next;
 417                 free_entry(ent);
 418                 ent = nextent;
 419         }
 420 }
 421
 422 static fk_entry
 423 do_entry(struct conf_entry * ent)
 424 {
 425 #define REASON_MAX      80
 426         int modtime;
 427         fk_entry free_or_keep;
 428         double diffsecs;
 429         char temp_reason[REASON_MAX];
 430
 431         free_or_keep = FREE_ENT;
 432         if (verbose) {
 433                 if (ent->flags & CE_COMPACT)
 434                         printf("%s <%dZ>: ", ent->log, ent->numlogs);
 435                 else if (ent->flags & CE_BZCOMPACT)
 436                         printf("%s <%dJ>: ", ent->log, ent->numlogs);
 437                 else
 438                         printf("%s <%d>: ", ent->log, ent->numlogs);
 439         }
 440         ent->fsize = sizefile(ent->log);
 441         modtime = age_old_log(ent->log);
 442         ent->rotate = 0;
 443         ent->firstcreate = 0;
 444         if (ent->fsize < 0) {
 445                 /*
 446                  * If either the C flag or the -C option was specified,
 447                  * and if we won't be creating the file, then have the
 448                  * verbose message include a hint as to why the file
 449                  * will not be created.
 450                  */
 451                 temp_reason[0] = '\0';
 452                 if (createlogs > 1)
 453                         ent->firstcreate = 1;
 454                 else if ((ent->flags & CE_CREATE) && createlogs)
 455                         ent->firstcreate = 1;
 456                 else if (ent->flags & CE_CREATE)
 457                         strlcpy(temp_reason, " (no -C option)", REASON_MAX);
 458                 else if (createlogs)
 459                         strlcpy(temp_reason, " (no C flag)", REASON_MAX);
 460
 461                 if (ent->firstcreate) {
 462                         if (verbose)
 463                                 printf("does not exist -> will create.\n");
 464                         createlog(ent);
 465                 } else if (verbose) {
 466                         printf("does not exist, skipped%s.\n", temp_reason);
 467                 }
 468         } else {
 469                 if (ent->flags & CE_TRIMAT && !force && !rotatereq) {
 470                         diffsecs = ptimeget_diff(timenow, ent->trim_at);
 471                         if (diffsecs < 0.0) {
 472                                 /* trim_at is some time in the future. */
 473                                 if (verbose) {
 474                                         ptime_adjust4dst(ent->trim_at,
 475                                             timenow);
 476                                         printf("--> will trim at %s",
 477                                             ptimeget_ctime(ent->trim_at));
 478                                 }
 479                                 return (free_or_keep);
 480                         } else if (diffsecs >= 3600.0) {
 481                                 /*
 482                                  * trim_at is more than an hour in the past,
 483                                  * so find the next valid trim_at time, and
 484                                  * tell the user what that will be.
 485                                  */
 486                                 if (verbose && dbg_at_times)
 487                                         printf("\n\t--> prev trim at %s\t",
 488                                             ptimeget_ctime(ent->trim_at));
 489                                 if (verbose) {
 490                                         ptimeset_nxtime(ent->trim_at);
 491                                         printf("--> will trim at %s",
 492                                             ptimeget_ctime(ent->trim_at));
 493                                 }
 494                                 return (free_or_keep);
 495                         } else if (verbose && noaction && dbg_at_times) {
 496                                 /*
 497                                  * If we are just debugging at-times, then
 498                                  * a detailed message is helpful.  Also
 499                                  * skip "doing" any commands, since they
 500                                  * would all be turned off by no-action.
 501                                  */
 502                                 printf("\n\t--> timematch at %s",
 503                                     ptimeget_ctime(ent->trim_at));
 504                                 return (free_or_keep);
 505                         } else if (verbose && ent->hours <= 0) {
 506                                 printf("--> time is up\n");
 507                         }
 508                 }
 509                 if (verbose && (ent->trsize > 0))
 510                         printf("size (Kb): %d [%d] ", ent->fsize, ent->trsize);
 511                 if (verbose && (ent->hours > 0))
 512                         printf(" age (hr): %d [%d] ", modtime, ent->hours);
 513
 514                 /*
 515                  * Figure out if this logfile needs to be rotated.
 516                  */
 517                 temp_reason[0] = '\0';
 518                 if (rotatereq) {
 519                         ent->rotate = 1;
 520                         snprintf(temp_reason, REASON_MAX, " due to -R from %s",
 521                             requestor);
 522                 } else if (force) {
 523                         ent->rotate = 1;
 524                         snprintf(temp_reason, REASON_MAX, " due to -F request");
 525                 } else if ((ent->trsize > 0) && (ent->fsize >= ent->trsize)) {
 526                         ent->rotate = 1;
 527                         snprintf(temp_reason, REASON_MAX, " due to size>%dK",
 528                             ent->trsize);
 529                 } else if (ent->hours <= 0 && (ent->flags & CE_TRIMAT)) {
 530                         ent->rotate = 1;
 531                 } else if ((ent->hours > 0) && ((modtime >= ent->hours) ||
 532                     (modtime < 0))) {
 533                         ent->rotate = 1;
 534                 }
 535
 536                 /*
 537                  * If the file needs to be rotated, then rotate it.
 538                  */
 539                 if (ent->rotate && !norotate) {
 540                         if (temp_reason[0] != '\0')
 541                                 ent->r_reason = strdup(temp_reason);
 542                         if (verbose)
 543                                 printf("--> trimming log....\n");
 544                         if (noaction && !verbose) {
 545                                 if (ent->flags & CE_COMPACT)
 546                                         printf("%s <%dZ>: trimming\n",
 547                                             ent->log, ent->numlogs);
 548                                 else if (ent->flags & CE_BZCOMPACT)
 549                                         printf("%s <%dJ>: trimming\n",
 550                                             ent->log, ent->numlogs);
 551                                 else
 552                                         printf("%s <%d>: trimming\n",
 553                                             ent->log, ent->numlogs);
 554                         }
 555                         free_or_keep = do_rotate(ent);
 556                 } else {
 557                         if (verbose)
 558                                 printf("--> skipping\n");
 559                 }
 560         }
 561         return (free_or_keep);
 562 #undef REASON_MAX
 563 }
 564
 565 static void
 566 parse_args(int argc, char **argv)
 567 {
 568         int ch;
 569         char *p;
 570
 571         timenow = ptime_init(NULL);
 572         ptimeset_time(timenow, time(NULL));
 573         strlcpy(daytime, ptimeget_ctime(timenow) + 4, DAYTIME_LEN);
 574
 575         /* Let's get our hostname */
 576         (void)gethostname(hostname, sizeof(hostname));
 577
 578         /* Truncate domain */
 579         if ((p = strchr(hostname, '.')) != NULL)
 580                 *p = '\0';
 581
 582         /* Parse command line options. */
 583         while ((ch = getopt(argc, argv, "a:d:f:nrsvCD:FNR:")) != -1)
 584                 switch (ch) {
 585                 case 'a':
 586                         archtodir++;
 587                         archdirname = optarg;
 588                         break;
 589                 case 'd':
 590                         destdir = optarg;
 591                         break;
 592                 case 'f':
 593                         conf = optarg;
 594                         break;
 595                 case 'n':
 596                         noaction++;
 597                         break;
 598                 case 'r':
 599                         needroot = 0;
 600                         break;
 601                 case 's':
 602                         nosignal = 1;
 603                         break;
 604                 case 'v':
 605                         verbose++;
 606                         break;
 607                 case 'C':
 608                         /* Useful for things like rc.diskless... */
 609                         createlogs++;
 610                         break;
 611                 case 'D':
 612                         /*
 613                          * Set some debugging option.  The specific option
 614                          * depends on the value of optarg.  These options
 615                          * may come and go without notice or documentation.
 616                          */
 617                         if (parse_doption(optarg))
 618                                 break;
 619                         usage();
 620                         /* NOTREACHED */
 621                 case 'F':
 622                         force++;
 623                         break;
 624                 case 'N':
 625                         norotate++;
 626                         break;
 627                 case 'R':
 628                         rotatereq++;
 629                         requestor = strdup(optarg);
 630                         break;
 631                 case 'm':       /* Used by OpenBSD for "monitor mode" */
 632                 default:
 633                         usage();
 634                         /* NOTREACHED */
 635                 }
 636
 637         if (force && norotate) {
 638                 warnx("Only one of -F and -N may be specified.");
 639                 usage();
 640                 /* NOTREACHED */
 641         }
 642
 643         if (rotatereq) {
 644                 if (optind == argc) {
 645                         warnx("At least one filename must be given when -R is specified.");
 646                         usage();
 647                         /* NOTREACHED */
 648                 }
 649                 /* Make sure "requestor" value is safe for a syslog message. */
 650                 for (p = requestor; *p != '\0'; p++) {
 651                         if (!isprintch(*p) && (*p != '\t'))
 652                                 *p = '.';
 653                 }
 654         }
 655
 656         if (dbg_timenow) {
 657                 /*
 658                  * Note that the 'daytime' variable is not changed.
 659                  * That is only used in messages that track when a
 660                  * logfile is rotated, and if a file *is* rotated,
 661                  * then it will still rotated at the "real now" time.
 662                  */
 663                 ptime_free(timenow);
 664                 timenow = dbg_timenow;
 665                 fprintf(stderr, "Debug: Running as if TimeNow is %s",
 666                     ptimeget_ctime(dbg_timenow));
 667         }
 668
 669 }
 670
 671 /*
 672  * These debugging options are mainly meant for developer use, such
 673  * as writing regression-tests.  They would not be needed by users
 674  * during normal operation of newsyslog...
 675  */
 676 static int
 677 parse_doption(const char *doption)
 678 {
 679         const char TN[] = "TN=";
 680         int res;
 681
 682         if (strncmp(doption, TN, sizeof(TN) - 1) == 0) {
 683                 /*
 684                  * The "TimeNow" debugging option.  This might be off
 685                  * by an hour when crossing a timezone change.
 686                  */
 687                 dbg_timenow = ptime_init(NULL);
 688                 res = ptime_relparse(dbg_timenow, PTM_PARSE_ISO8601,
 689                     time(NULL), doption + sizeof(TN) - 1);
 690                 if (res == -2) {
 691                         warnx("Non-existent time specified on -D %s", doption);
 692                         return (0);                     /* failure */
 693                 } else if (res < 0) {
 694                         warnx("Malformed time given on -D %s", doption);
 695                         return (0);                     /* failure */
 696                 }
 697                 return (1);                     /* successfully parsed */
 698
 699         }
 700
 701         if (strcmp(doption, "ats") == 0) {
 702                 dbg_at_times++;
 703                 return (1);                     /* successfully parsed */
 704         }
 705
 706         /* XXX - This check could probably be dropped. */
 707         if ((strcmp(doption, "neworder") == 0) || (strcmp(doption, "oldorder")
 708             == 0)) {
 709                 warnx("NOTE: newsyslog always uses 'neworder'.");
 710                 return (1);                     /* successfully parsed */
 711         }
 712
 713         warnx("Unknown -D (debug) option: '%s'", doption);
 714         return (0);                             /* failure */
 715 }
 716
 717 static void
 718 usage(void)
 719 {
 720
 721         fprintf(stderr,
 722             "usage: newsyslog [-CFNnrsv] [-a directory] [-d directory] [-f config-file]\n"
 723             "                 [ [-R requestor] filename ... ]\n");
 724         exit(1);
 725 }
 726
 727 /*
 728  * Parse a configuration file and return a linked list of all the logs
 729  * which should be processed.
 730  */
 731 static struct conf_entry *
 732 get_worklist(char **files)
 733 {
 734         FILE *f;
 735         const char *fname;
 736         char **given;
 737         struct conf_entry *defconf, *dupent, *ent, *firstnew;
 738         struct conf_entry *globlist, *lastnew, *worklist;
 739         int gmatch, fnres;
 740
 741         defconf = globlist = worklist = NULL;
 742
 743         fname = conf;
 744         if (fname == NULL)
 745                 fname = _PATH_CONF;
 746
 747         if (strcmp(fname, "-") != 0)
 748                 f = fopen(fname, "r");
 749         else {
 750                 f = stdin;
 751                 fname = "<stdin>";
 752         }
 753         if (!f)
 754                 err(1, "%s", fname);
 755
 756         parse_file(f, fname, &worklist, &globlist, &defconf);
 757         (void) fclose(f);
 758
 759         /*
 760          * All config-file information has been read in and turned into
 761          * a worklist and a globlist.  If there were no specific files
 762          * given on the run command, then the only thing left to do is to
 763          * call a routine which finds all files matched by the globlist
 764          * and adds them to the worklist.  Then return the worklist.
 765          */
 766         if (*files == NULL) {
 767                 expand_globs(&worklist, &globlist);
 768                 free_clist(&globlist);
 769                 if (defconf != NULL)
 770                         free_entry(defconf);
 771                 return (worklist);
 772                 /* NOTREACHED */
 773         }
 774
 775         /*
 776          * If newsyslog was given a specific list of files to process,
 777          * it may be that some of those files were not listed in any
 778          * config file.  Those unlisted files should get the default
 779          * rotation action.  First, create the default-rotation action
 780          * if none was found in a system config file.
 781          */
 782         if (defconf == NULL) {
 783                 defconf = init_entry(DEFAULT_MARKER, NULL);
 784                 defconf->numlogs = 3;
 785                 defconf->trsize = 50;
 786                 defconf->permissions = S_IRUSR|S_IWUSR;
 787         }
 788
 789         /*
 790          * If newsyslog was run with a list of specific filenames,
 791          * then create a new worklist which has only those files in
 792          * it, picking up the rotation-rules for those files from
 793          * the original worklist.
 794          *
 795          * XXX - Note that this will copy multiple rules for a single
 796          *      logfile, if multiple entries are an exact match for
 797          *      that file.  That matches the historic behavior, but do
 798          *      we want to continue to allow it?  If so, it should
 799          *      probably be handled more intelligently.
 800          */
 801         firstnew = lastnew = NULL;
 802         for (given = files; *given; ++given) {
 803                 /*
 804                  * First try to find exact-matches for this given file.
 805                  */
 806                 gmatch = 0;
 807                 for (ent = worklist; ent; ent = ent->next) {
 808                         if (strcmp(ent->log, *given) == 0) {
 809                                 gmatch++;
 810                                 dupent = init_entry(*given, ent);
 811                                 if (!firstnew)
 812                                         firstnew = dupent;
 813                                 else
 814                                         lastnew->next = dupent;
 815                                 lastnew = dupent;
 816                         }
 817                 }
 818                 if (gmatch) {
 819                         if (verbose > 2)
 820                                 printf("\t+ Matched entry %s\n", *given);
 821                         continue;
 822                 }
 823
 824                 /*
 825                  * There was no exact-match for this given file, so look
 826                  * for a "glob" entry which does match.
 827                  */
 828                 gmatch = 0;
 829                 if (verbose > 2 && globlist != NULL)
 830                         printf("\t+ Checking globs for %s\n", *given);
 831                 for (ent = globlist; ent; ent = ent->next) {
 832                         fnres = fnmatch(ent->log, *given, FNM_PATHNAME);
 833                         if (verbose > 2)
 834                                 printf("\t+    = %d for pattern %s\n", fnres,
 835                                     ent->log);
 836                         if (fnres == 0) {
 837                                 gmatch++;
 838                                 dupent = init_entry(*given, ent);
 839                                 if (!firstnew)
 840                                         firstnew = dupent;
 841                                 else
 842                                         lastnew->next = dupent;
 843                                 lastnew = dupent;
 844                                 /* This new entry is not a glob! */
 845                                 dupent->flags &= ~CE_GLOB;
 846                                 /* Only allow a match to one glob-entry */
 847                                 break;
 848                         }
 849                 }
 850                 if (gmatch) {
 851                         if (verbose > 2)
 852                                 printf("\t+ Matched %s via %s\n", *given,
 853                                     ent->log);
 854                         continue;
 855                 }
 856
 857                 /*
 858                  * This given file was not found in any config file, so
 859                  * add a worklist item based on the default entry.
 860                  */
 861                 if (verbose > 2)
 862                         printf("\t+ No entry matched %s  (will use %s)\n",
 863                             *given, DEFAULT_MARKER);
 864                 dupent = init_entry(*given, defconf);
 865                 if (!firstnew)
 866                         firstnew = dupent;
 867                 else
 868                         lastnew->next = dupent;
 869                 /* Mark that it was *not* found in a config file */
 870                 dupent->def_cfg = 1;
 871                 lastnew = dupent;
 872         }
 873
 874         /*
 875          * Free all the entries in the original work list, the list of
 876          * glob entries, and the default entry.
 877          */
 878         free_clist(&worklist);
 879         free_clist(&globlist);
 880         free_entry(defconf);
 881
 882         /* And finally, return a worklist which matches the given files. */
 883         return (firstnew);
 884 }
 885
 886 /*
 887  * Expand the list of entries with filename patterns, and add all files
 888  * which match those glob-entries onto the worklist.
 889  */
 890 static void
 891 expand_globs(struct conf_entry **work_p, struct conf_entry **glob_p)
 892 {
 893         int gmatch, gres;
 894         size_t i;
 895         char *mfname;
 896         struct conf_entry *dupent, *ent, *firstmatch, *globent;
 897         struct conf_entry *lastmatch;
 898         glob_t pglob;
 899         struct stat st_fm;
 900
 901         if ((glob_p == NULL) || (*glob_p == NULL))
 902                 return;                 /* There is nothing to do. */
 903
 904         /*
 905          * The worklist contains all fully-specified (non-GLOB) names.
 906          *
 907          * Now expand the list of filename-pattern (GLOB) entries into
 908          * a second list, which (by definition) will only match files
 909          * that already exist.  Do not add a glob-related entry for any
 910          * file which already exists in the fully-specified list.
 911          */
 912         firstmatch = lastmatch = NULL;
 913         for (globent = *glob_p; globent; globent = globent->next) {
 914
 915                 gres = glob(globent->log, GLOB_NOCHECK, NULL, &pglob);
 916                 if (gres != 0) {
 917                         warn("cannot expand pattern (%d): %s", gres,
 918                             globent->log);
 919                         continue;
 920                 }
 921
 922                 if (verbose > 2)
 923                         printf("\t+ Expanding pattern %s\n", globent->log);
 924                 for (i = 0; i < pglob.gl_matchc; i++) {
 925                         mfname = pglob.gl_pathv[i];
 926
 927                         /* See if this file already has a specific entry. */
 928                         gmatch = 0;
 929                         for (ent = *work_p; ent; ent = ent->next) {
 930                                 if (strcmp(mfname, ent->log) == 0) {
 931                                         gmatch++;
 932                                         break;
 933                                 }
 934                         }
 935                         if (gmatch)
 936                                 continue;
 937
 938                         /* Make sure the named matched is a file. */
 939                         gres = lstat(mfname, &st_fm);
 940                         if (gres != 0) {
 941                                 /* Error on a file that glob() matched?!? */
 942                                 warn("Skipping %s - lstat() error", mfname);
 943                                 continue;
 944                         }
 945                         if (!S_ISREG(st_fm.st_mode)) {
 946                                 /* We only rotate files! */
 947                                 if (verbose > 2)
 948                                         printf("\t+  . skipping %s (!file)\n",
 949                                             mfname);
 950                                 continue;
 951                         }
 952
 953                         if (verbose > 2)
 954                                 printf("\t+  . add file %s\n", mfname);
 955                         dupent = init_entry(mfname, globent);
 956                         if (!firstmatch)
 957                                 firstmatch = dupent;
 958                         else
 959                                 lastmatch->next = dupent;
 960                         lastmatch = dupent;
 961                         /* This new entry is not a glob! */
 962                         dupent->flags &= ~CE_GLOB;
 963                 }
 964                 globfree(&pglob);
 965                 if (verbose > 2)
 966                         printf("\t+ Done with pattern %s\n", globent->log);
 967         }
 968
 969         /* Add the list of matched files to the end of the worklist. */
 970         if (!*work_p)
 971                 *work_p = firstmatch;
 972         else {
 973                 ent = *work_p;
 974                 while (ent->next)
 975                         ent = ent->next;
 976                 ent->next = firstmatch;
 977         }
 978
 979 }
 980
 981 /*
 982  * Parse a configuration file and update a linked list of all the logs to
 983  * process.
 984  */
 985 static void
 986 parse_file(FILE *cf, const char *cfname, struct conf_entry **work_p,
 987     struct conf_entry **glob_p, struct conf_entry **defconf_p)
 988 {
 989         char line[BUFSIZ], *parse, *q;
 990         char *cp, *errline, *group;
 991         struct conf_entry *lastglob, *lastwork, *working;
 992         struct passwd *pwd;
 993         struct group *grp;
 994         int eol, ptm_opts, res, special;
 995
 996         /*
 997          * XXX - for now, assume that only one config file will be read,
 998          *      ie, this routine is only called one time.
 999          */
1000         lastglob = lastwork = NULL;
1001
1002         errline = NULL;
1003         while (fgets(line, BUFSIZ, cf)) {
1004                 if ((line[0] == '\n') || (line[0] == '#') ||
1005                     (strlen(line) == 0))
1006                         continue;
1007                 if (errline != NULL)
1008                         free(errline);
1009                 errline = strdup(line);
1010                 for (cp = line + 1; *cp != '\0'; cp++) {
1011                         if (*cp != '#')
1012                                 continue;
1013                         if (*(cp - 1) == '\\') {
1014                                 strcpy(cp - 1, cp);
1015                                 cp--;
1016                                 continue;
1017                         }
1018                         *cp = '\0';
1019                         break;
1020                 }
1021
1022                 q = parse = missing_field(sob(line), errline);
1023                 parse = son(line);
1024                 if (!*parse)
1025                         errx(1, "malformed line (missing fields):\n%s",
1026                             errline);
1027                 *parse = '\0';
1028
1029                 /*
1030                  * Allow people to set debug options via the config file.
1031                  * (NOTE: debug optons are undocumented, and may disappear
1032                  * at any time, etc).
1033                  */
1034                 if (strcasecmp(DEBUG_MARKER, q) == 0) {
1035                         q = parse = missing_field(sob(++parse), errline);
1036                         parse = son(parse);
1037                         if (!*parse)
1038                                 warnx("debug line specifies no option:\n%s",
1039                                     errline);
1040                         else {
1041                                 *parse = '\0';
1042                                 parse_doption(q);
1043                         }
1044                         continue;
1045                 }
1046
1047                 special = 0;
1048                 working = init_entry(q, NULL);
1049                 if (strcasecmp(DEFAULT_MARKER, q) == 0) {
1050                         special = 1;
1051                         if (defconf_p == NULL) {
1052                                 warnx("Ignoring entry for %s in %s!", q,
1053                                     cfname);
1054                                 free_entry(working);
1055                                 continue;
1056                         } else if (*defconf_p != NULL) {
1057                                 warnx("Ignoring duplicate entry for %s!", q);
1058                                 free_entry(working);
1059                                 continue;
1060                         }
1061                         *defconf_p = working;
1062                 }
1063
1064                 q = parse = missing_field(sob(++parse), errline);
1065                 parse = son(parse);
1066                 if (!*parse)
1067                         errx(1, "malformed line (missing fields):\n%s",
1068                             errline);
1069                 *parse = '\0';
1070                 if ((group = strchr(q, ':')) != NULL ||
1071                     (group = strrchr(q, '.')) != NULL) {
1072                         *group++ = '\0';
1073                         if (*q) {
1074                                 if (!(isnumberstr(q))) {
1075                                         if ((pwd = getpwnam(q)) == NULL)
1076                                                 errx(1,
1077                                      "error in config file; unknown user:\n%s",
1078                                                     errline);
1079                                         working->uid = pwd->pw_uid;
1080                                 } else
1081                                         working->uid = atoi(q);
1082                         } else
1083                                 working->uid = (uid_t)-1;
1084
1085                         q = group;
1086                         if (*q) {
1087                                 if (!(isnumberstr(q))) {
1088                                         if ((grp = getgrnam(q)) == NULL)
1089                                                 errx(1,
1090                                     "error in config file; unknown group:\n%s",
1091                                                     errline);
1092                                         working->gid = grp->gr_gid;
1093                                 } else
1094                                         working->gid = atoi(q);
1095                         } else
1096                                 working->gid = (gid_t)-1;
1097
1098                         q = parse = missing_field(sob(++parse), errline);
1099                         parse = son(parse);
1100                         if (!*parse)
1101                                 errx(1, "malformed line (missing fields):\n%s",
1102                                     errline);
1103                         *parse = '\0';
1104                 } else {
1105                         working->uid = (uid_t)-1;
1106                         working->gid = (gid_t)-1;
1107                 }
1108
1109                 if (!sscanf(q, "%o", &working->permissions))
1110                         errx(1, "error in config file; bad permissions:\n%s",
1111                             errline);
1112
1113                 q = parse = missing_field(sob(++parse), errline);
1114                 parse = son(parse);
1115                 if (!*parse)
1116                         errx(1, "malformed line (missing fields):\n%s",
1117                             errline);
1118                 *parse = '\0';
1119                 if (!sscanf(q, "%d", &working->numlogs) || working->numlogs < 0)
1120                         errx(1, "error in config file; bad value for count of logs to save:\n%s",
1121                             errline);
1122
1123                 q = parse = missing_field(sob(++parse), errline);
1124                 parse = son(parse);
1125                 if (!*parse)
1126                         errx(1, "malformed line (missing fields):\n%s",
1127                             errline);
1128                 *parse = '\0';
1129                 if (isdigitch(*q))
1130                         working->trsize = atoi(q);
1131                 else if (strcmp(q, "*") == 0)
1132                         working->trsize = -1;
1133                 else {
1134                         warnx("Invalid value of '%s' for 'size' in line:\n%s",
1135                             q, errline);
1136                         working->trsize = -1;
1137                 }
1138
1139                 working->flags = 0;
1140                 q = parse = missing_field(sob(++parse), errline);
1141                 parse = son(parse);
1142                 eol = !*parse;
1143                 *parse = '\0';
1144                 {
1145                         char *ep;
1146                         u_long ul;
1147
1148                         ul = strtoul(q, &ep, 10);
1149                         if (ep == q)
1150                                 working->hours = 0;
1151                         else if (*ep == '*')
1152                                 working->hours = -1;
1153                         else if (ul > INT_MAX)
1154                                 errx(1, "interval is too large:\n%s", errline);
1155                         else
1156                                 working->hours = ul;
1157
1158                         if (*ep == '\0' || strcmp(ep, "*") == 0)
1159                                 goto no_trimat;
1160                         if (*ep != '@' && *ep != '$')
1161                                 errx(1, "malformed interval/at:\n%s", errline);
1162
1163                         working->flags |= CE_TRIMAT;
1164                         working->trim_at = ptime_init(NULL);
1165                         ptm_opts = PTM_PARSE_ISO8601;
1166                         if (*ep == '$')
1167                                 ptm_opts = PTM_PARSE_DWM;
1168                         ptm_opts |= PTM_PARSE_MATCHDOM;
1169                         res = ptime_relparse(working->trim_at, ptm_opts,
1170                             ptimeget_secs(timenow), ep + 1);
1171                         if (res == -2)
1172                                 errx(1, "nonexistent time for 'at' value:\n%s",
1173                                     errline);
1174                         else if (res < 0)
1175                                 errx(1, "malformed 'at' value:\n%s", errline);
1176                 }
1177 no_trimat:
1178
1179                 if (eol)
1180                         q = NULL;
1181                 else {
1182                         q = parse = sob(++parse);       /* Optional field */
1183                         parse = son(parse);
1184                         if (!*parse)
1185                                 eol = 1;
1186                         *parse = '\0';
1187                 }
1188
1189                 for (; q && *q && !isspacech(*q); q++) {
1190                         switch (tolowerch(*q)) {
1191                         case 'b':
1192                                 working->flags |= CE_BINARY;
1193                                 break;
1194                         case 'c':
1195                                 /*
1196                                  * XXX -        Ick! Ugly! Remove ASAP!
1197                                  * We want `c' and `C' for "create".  But we
1198                                  * will temporarily treat `c' as `g', because
1199                                  * FreeBSD releases <= 4.8 have a typo of
1200                                  * checking  ('G' || 'c')  for CE_GLOB.
1201                                  */
1202                                 if (*q == 'c') {
1203                                         warnx("Assuming 'g' for 'c' in flags for line:\n%s",
1204                                             errline);
1205                                         warnx("The 'c' flag will eventually mean 'CREATE'");
1206                                         working->flags |= CE_GLOB;
1207                                         break;
1208                                 }
1209                                 working->flags |= CE_CREATE;
1210                                 break;
1211                         case 'd':
1212                                 working->flags |= CE_NODUMP;
1213                                 break;
1214                         case 'g':
1215                                 working->flags |= CE_GLOB;
1216                                 break;
1217                         case 'j':
1218                                 working->flags |= CE_BZCOMPACT;
1219                                 break;
1220                         case 'n':
1221                                 working->flags |= CE_NOSIGNAL;
1222                                 break;
1223                         case 'u':
1224                                 working->flags |= CE_SIGNALGROUP;
1225                                 break;
1226                         case 'w':
1227                                 /* Depreciated flag - keep for compatibility purposes */
1228                                 break;
1229                         case 'z':
1230                                 working->flags |= CE_COMPACT;
1231                                 break;
1232                         case '-':
1233                                 break;
1234                         case 'f':       /* Used by OpenBSD for "CE_FOLLOW" */
1235                         case 'm':       /* Used by OpenBSD for "CE_MONITOR" */
1236                         case 'p':       /* Used by NetBSD  for "CE_PLAIN0" */
1237                         default:
1238                                 errx(1, "illegal flag in config file -- %c",
1239                                     *q);
1240                         }
1241                 }
1242
1243                 if (eol)
1244                         q = NULL;
1245                 else {
1246                         q = parse = sob(++parse);       /* Optional field */
1247                         parse = son(parse);
1248                         if (!*parse)
1249                                 eol = 1;
1250                         *parse = '\0';
1251                 }
1252
1253                 working->pid_file = NULL;
1254                 if (q && *q) {
1255                         if (*q == '/')
1256                                 working->pid_file = strdup(q);
1257                         else if (isdigit(*q))
1258                                 goto got_sig;
1259                         else
1260                                 errx(1,
1261                         "illegal pid file or signal number in config file:\n%s",
1262                                     errline);
1263                 }
1264                 if (eol)
1265                         q = NULL;
1266                 else {
1267                         q = parse = sob(++parse);       /* Optional field */
1268                         *(parse = son(parse)) = '\0';
1269                 }
1270
1271                 working->sig = SIGHUP;
1272                 if (q && *q) {
1273                         if (isdigit(*q)) {
1274                 got_sig:
1275                                 working->sig = atoi(q);
1276                         } else {
1277                 err_sig:
1278                                 errx(1,
1279                                     "illegal signal number in config file:\n%s",
1280                                     errline);
1281                         }
1282                         if (working->sig < 1 || working->sig >= NSIG)
1283                                 goto err_sig;
1284                 }
1285
1286                 /*
1287                  * Finish figuring out what pid-file to use (if any) in
1288                  * later processing if this logfile needs to be rotated.
1289                  */
1290                 if ((working->flags & CE_NOSIGNAL) == CE_NOSIGNAL) {
1291                         /*
1292                          * This config-entry specified 'n' for nosignal,
1293                          * see if it also specified an explicit pid_file.
1294                          * This would be a pretty pointless combination.
1295                          */
1296                         if (working->pid_file != NULL) {
1297                                 warnx("Ignoring '%s' because flag 'n' was specified in line:\n%s",
1298                                     working->pid_file, errline);
1299                                 free(working->pid_file);
1300                                 working->pid_file = NULL;
1301                         }
1302                 } else if (working->pid_file == NULL) {
1303                         /*
1304                          * This entry did not specify the 'n' flag, which
1305                          * means it should signal syslogd unless it had
1306                          * specified some other pid-file (and obviously the
1307                          * syslog pid-file will not be for a process-group).
1308                          * Also, we should only try to notify syslog if we
1309                          * are root.
1310                          */
1311                         if (working->flags & CE_SIGNALGROUP) {
1312                                 warnx("Ignoring flag 'U' in line:\n%s",
1313                                     errline);
1314                                 working->flags &= ~CE_SIGNALGROUP;
1315                         }
1316                         if (needroot)
1317                                 working->pid_file = strdup(_PATH_SYSLOGPID);
1318                 }
1319
1320                 /*
1321                  * Add this entry to the appropriate list of entries, unless
1322                  * it was some kind of special entry (eg: <default>).
1323                  */
1324                 if (special) {
1325                         ;                       /* Do not add to any list */
1326                 } else if (working->flags & CE_GLOB) {
1327                         if (!*glob_p)
1328                                 *glob_p = working;
1329                         else
1330                                 lastglob->next = working;
1331                         lastglob = working;
1332                 } else {
1333                         if (!*work_p)
1334                                 *work_p = working;
1335                         else
1336                                 lastwork->next = working;
1337                         lastwork = working;
1338                 }
1339         }
1340         if (errline != NULL)
1341                 free(errline);
1342 }
1343
1344 static char *
1345 missing_field(char *p, char *errline)
1346 {
1347
1348         if (!p || !*p)
1349                 errx(1, "missing field in config file:\n%s", errline);
1350         return (p);
1351 }
1352
1353 static fk_entry
1354 do_rotate(const struct conf_entry *ent)
1355 {
1356         char dirpart[MAXPATHLEN], namepart[MAXPATHLEN];
1357         char file1[MAXPATHLEN], file2[MAXPATHLEN];
1358         char zfile1[MAXPATHLEN], zfile2[MAXPATHLEN];
1359         char jfile1[MAXPATHLEN];
1360         int flags, numlogs_c;
1361         fk_entry free_or_keep;
1362         struct sigwork_entry *swork;
1363         struct stat st;
1364
1365         flags = ent->flags;
1366         free_or_keep = FREE_ENT;
1367
1368         if (archtodir) {
1369                 char *p;
1370
1371                 /* build complete name of archive directory into dirpart */
1372                 if (*archdirname == '/') {      /* absolute */
1373                         strlcpy(dirpart, archdirname, sizeof(dirpart));
1374                 } else {        /* relative */
1375                         /* get directory part of logfile */
1376                         strlcpy(dirpart, ent->log, sizeof(dirpart));
1377                         if ((p = rindex(dirpart, '/')) == NULL)
1378                                 dirpart[0] = '\0';
1379                         else
1380                                 *(p + 1) = '\0';
1381                         strlcat(dirpart, archdirname, sizeof(dirpart));
1382                 }
1383
1384                 /* check if archive directory exists, if not, create it */
1385                 if (lstat(dirpart, &st))
1386                         createdir(ent, dirpart);
1387
1388                 /* get filename part of logfile */
1389                 if ((p = rindex(ent->log, '/')) == NULL)
1390                         strlcpy(namepart, ent->log, sizeof(namepart));
1391                 else
1392                         strlcpy(namepart, p + 1, sizeof(namepart));
1393
1394                 /* name of oldest log */
1395                 (void) snprintf(file1, sizeof(file1), "%s/%s.%d", dirpart,
1396                     namepart, ent->numlogs);
1397                 (void) snprintf(zfile1, sizeof(zfile1), "%s%s", file1,
1398                     COMPRESS_POSTFIX);
1399                 snprintf(jfile1, sizeof(jfile1), "%s%s", file1,
1400                     BZCOMPRESS_POSTFIX);
1401         } else {
1402                 /* name of oldest log */
1403                 (void) snprintf(file1, sizeof(file1), "%s.%d", ent->log,
1404                     ent->numlogs);
1405                 (void) snprintf(zfile1, sizeof(zfile1), "%s%s", file1,
1406                     COMPRESS_POSTFIX);
1407                 snprintf(jfile1, sizeof(jfile1), "%s%s", file1,
1408                     BZCOMPRESS_POSTFIX);
1409         }
1410
1411         if (noaction) {
1412                 printf("\trm -f %s\n", file1);
1413                 printf("\trm -f %s\n", zfile1);
1414                 printf("\trm -f %s\n", jfile1);
1415         } else {
1416                 (void) unlink(file1);
1417                 (void) unlink(zfile1);
1418                 (void) unlink(jfile1);
1419         }
1420
1421         /* Move down log files */
1422         numlogs_c = ent->numlogs;               /* copy for countdown */
1423         while (numlogs_c--) {
1424
1425                 (void) strlcpy(file2, file1, sizeof(file2));
1426
1427                 if (archtodir)
1428                         (void) snprintf(file1, sizeof(file1), "%s/%s.%d",
1429                             dirpart, namepart, numlogs_c);
1430                 else
1431                         (void) snprintf(file1, sizeof(file1), "%s.%d",
1432                             ent->log, numlogs_c);
1433
1434                 (void) strlcpy(zfile1, file1, sizeof(zfile1));
1435                 (void) strlcpy(zfile2, file2, sizeof(zfile2));
1436                 if (lstat(file1, &st)) {
1437                         (void) strlcat(zfile1, COMPRESS_POSTFIX,
1438                             sizeof(zfile1));
1439                         (void) strlcat(zfile2, COMPRESS_POSTFIX,
1440                             sizeof(zfile2));
1441                         if (lstat(zfile1, &st)) {
1442                                 strlcpy(zfile1, file1, sizeof(zfile1));
1443                                 strlcpy(zfile2, file2, sizeof(zfile2));
1444                                 strlcat(zfile1, BZCOMPRESS_POSTFIX,
1445                                     sizeof(zfile1));
1446                                 strlcat(zfile2, BZCOMPRESS_POSTFIX,
1447                                     sizeof(zfile2));
1448                                 if (lstat(zfile1, &st))
1449                                         continue;
1450                         }
1451                 }
1452                 if (noaction)
1453                         printf("\tmv %s %s\n", zfile1, zfile2);
1454                 else {
1455                         /* XXX - Ought to be checking for failure! */
1456                         (void)rename(zfile1, zfile2);
1457                 }
1458                 change_attrs(zfile2, ent);
1459         }
1460
1461         if (ent->numlogs > 0) {
1462                 if (noaction) {
1463                         /*
1464                          * Note that savelog() may succeed with using link()
1465                          * for the archtodir case, but there is no good way
1466                          * of knowing if it will when doing "noaction", so
1467                          * here we claim that it will have to do a copy...
1468                          */
1469                         if (archtodir)
1470                                 printf("\tcp %s %s\n", ent->log, file1);
1471                         else
1472                                 printf("\tln %s %s\n", ent->log, file1);
1473                 } else {
1474                         if (!(flags & CE_BINARY)) {
1475                                 /* Report the trimming to the old log */
1476                                 log_trim(ent->log, ent);
1477                         }
1478                         savelog(ent->log, file1);
1479                 }
1480                 change_attrs(file1, ent);
1481         }
1482
1483         /* Create the new log file and move it into place */
1484         if (noaction)
1485                 printf("Start new log...\n");
1486         createlog(ent);
1487
1488         /*
1489          * Save all signalling and file-compression to be done after log
1490          * files from all entries have been rotated.  This way any one
1491          * process will not be sent the same signal multiple times when
1492          * multiple log files had to be rotated.
1493          */
1494         swork = NULL;
1495         if (ent->pid_file != NULL)
1496                 swork = save_sigwork(ent);
1497         if (ent->numlogs > 0 && (flags & (CE_COMPACT | CE_BZCOMPACT))) {
1498                 /*
1499                  * The zipwork_entry will include a pointer to this
1500                  * conf_entry, so the conf_entry should not be freed.
1501                  */
1502                 free_or_keep = KEEP_ENT;
1503                 save_zipwork(ent, swork, ent->fsize, file1);
1504         }
1505
1506         return (free_or_keep);
1507 }
1508
1509 static void
1510 do_sigwork(struct sigwork_entry *swork)
1511 {
1512         struct sigwork_entry *nextsig;
1513         int kres, secs;
1514
1515         if (!(swork->sw_pidok) || swork->sw_pid == 0)
1516                 return;                 /* no work to do... */
1517
1518         /*
1519          * If nosignal (-s) was specified, then do not signal any process.
1520          * Note that a nosignal request triggers a warning message if the
1521          * rotated logfile needs to be compressed, *unless* -R was also
1522          * specified.  We assume that an `-sR' request came from a process
1523          * which writes to the logfile, and as such, we assume that process
1524          * has already made sure the logfile is not presently in use.  This
1525          * just sets swork->sw_pidok to a special value, and do_zipwork
1526          * will print any necessary warning(s).
1527          */
1528         if (nosignal) {
1529                 if (!rotatereq)
1530                         swork->sw_pidok = -1;
1531                 return;
1532         }
1533
1534         /*
1535          * Compute the pause between consecutive signals.  Use a longer
1536          * sleep time if we will be sending two signals to the same
1537          * deamon or process-group.
1538          */
1539         secs = 0;
1540         nextsig = SLIST_NEXT(swork, sw_nextp);
1541         if (nextsig != NULL) {
1542                 if (swork->sw_pid == nextsig->sw_pid)
1543                         secs = 10;
1544                 else
1545                         secs = 1;
1546         }
1547
1548         if (noaction) {
1549                 printf("\tkill -%d %d \t\t# %s\n", swork->sw_signum,
1550                     (int)swork->sw_pid, swork->sw_fname);
1551                 if (secs > 0)
1552                         printf("\tsleep %d\n", secs);
1553                 return;
1554         }
1555
1556         kres = kill(swork->sw_pid, swork->sw_signum);
1557         if (kres != 0) {
1558                 /*
1559                  * Assume that "no such process" (ESRCH) is something
1560                  * to warn about, but is not an error.  Presumably the
1561                  * process which writes to the rotated log file(s) is
1562                  * gone, in which case we should have no problem with
1563                  * compressing the rotated log file(s).
1564                  */
1565                 if (errno != ESRCH)
1566                         swork->sw_pidok = 0;
1567                 warn("can't notify %s, pid %d", swork->sw_pidtype,
1568                     (int)swork->sw_pid);
1569         } else {
1570                 if (verbose)
1571                         printf("Notified %s pid %d = %s\n", swork->sw_pidtype,
1572                             (int)swork->sw_pid, swork->sw_fname);
1573                 if (secs > 0) {
1574                         if (verbose)
1575                                 printf("Pause %d second(s) between signals\n",
1576                                     secs);
1577                         sleep(secs);
1578                 }
1579         }
1580 }
1581
1582 static void
1583 do_zipwork(struct zipwork_entry *zwork)
1584 {
1585         const char *pgm_name, *pgm_path;
1586         int errsav, fcount, zstatus;
1587         pid_t pidzip, wpid;
1588         char zresult[MAXPATHLEN];
1589
1590         pgm_path = NULL;
1591         strlcpy(zresult, zwork->zw_fname, sizeof(zresult));
1592         if (zwork != NULL && zwork->zw_conf != NULL) {
1593                 if (zwork->zw_conf->flags & CE_COMPACT) {
1594                         pgm_path = _PATH_GZIP;
1595                         strlcat(zresult, COMPRESS_POSTFIX, sizeof(zresult));
1596                 } else if (zwork->zw_conf->flags & CE_BZCOMPACT) {
1597                         pgm_path = _PATH_BZIP2;
1598                         strlcat(zresult, BZCOMPRESS_POSTFIX, sizeof(zresult));
1599                 }
1600         }
1601         if (pgm_path == NULL) {
1602                 warnx("invalid entry for %s in do_zipwork", zwork->zw_fname);
1603                 return;
1604         }
1605         pgm_name = strrchr(pgm_path, '/');
1606         if (pgm_name == NULL)
1607                 pgm_name = pgm_path;
1608         else
1609                 pgm_name++;
1610
1611         if (zwork->zw_swork != NULL && zwork->zw_swork->sw_pidok <= 0) {
1612                 warnx(
1613                     "log %s not compressed because daemon(s) not notified",
1614                     zwork->zw_fname);
1615                 change_attrs(zwork->zw_fname, zwork->zw_conf);
1616                 return;
1617         }
1618
1619         if (noaction) {
1620                 printf("\t%s %s\n", pgm_name, zwork->zw_fname);
1621                 change_attrs(zresult, zwork->zw_conf);
1622                 return;
1623         }
1624
1625         fcount = 1;
1626         pidzip = fork();
1627         while (pidzip < 0) {
1628                 /*
1629                  * The fork failed.  If the failure was due to a temporary
1630                  * problem, then wait a short time and try it again.
1631                  */
1632                 errsav = errno;
1633                 warn("fork() for `%s %s'", pgm_name, zwork->zw_fname);
1634                 if (errsav != EAGAIN || fcount > 5)
1635                         errx(1, "Exiting...");
1636                 sleep(fcount * 12);
1637                 fcount++;
1638                 pidzip = fork();
1639         }
1640         if (!pidzip) {
1641                 /* The child process executes the compression command */
1642                 execl(pgm_path, pgm_path, "-f", zwork->zw_fname, (char *)0);
1643                 err(1, "execl(`%s -f %s')", pgm_path, zwork->zw_fname);
1644         }
1645
1646         wpid = waitpid(pidzip, &zstatus, 0);
1647         if (wpid == -1) {
1648                 /* XXX - should this be a fatal error? */
1649                 warn("%s: waitpid(%d)", pgm_path, pidzip);
1650                 return;
1651         }
1652         if (!WIFEXITED(zstatus)) {
1653                 warnx("`%s -f %s' did not terminate normally", pgm_name,
1654                     zwork->zw_fname);
1655                 return;
1656         }
1657         if (WEXITSTATUS(zstatus)) {
1658                 warnx("`%s -f %s' terminated with a non-zero status (%d)",
1659                     pgm_name, zwork->zw_fname, WEXITSTATUS(zstatus));
1660                 return;
1661         }
1662
1663         /* Compression was successful, set file attributes on the result. */
1664         change_attrs(zresult, zwork->zw_conf);
1665 }
1666
1667 /*
1668  * Save information on any process we need to signal.  Any single
1669  * process may need to be sent different signal-values for different
1670  * log files, but usually a single signal-value will cause the process
1671  * to close and re-open all of it's log files.
1672  */
1673 static struct sigwork_entry *
1674 save_sigwork(const struct conf_entry *ent)
1675 {
1676         struct sigwork_entry *sprev, *stmp;
1677         int ndiff;
1678         size_t tmpsiz;
1679
1680         sprev = NULL;
1681         ndiff = 1;
1682         SLIST_FOREACH(stmp, &swhead, sw_nextp) {
1683                 ndiff = strcmp(ent->pid_file, stmp->sw_fname);
1684                 if (ndiff > 0)
1685                         break;
1686                 if (ndiff == 0) {
1687                         if (ent->sig == stmp->sw_signum)
1688                                 break;
1689                         if (ent->sig > stmp->sw_signum) {
1690                                 ndiff = 1;
1691                                 break;
1692                         }
1693                 }
1694                 sprev = stmp;
1695         }
1696         if (stmp != NULL && ndiff == 0)
1697                 return (stmp);
1698
1699         tmpsiz = sizeof(struct sigwork_entry) + strlen(ent->pid_file) + 1;
1700         stmp = malloc(tmpsiz);
1701         set_swpid(stmp, ent);
1702         stmp->sw_signum = ent->sig;
1703         strcpy(stmp->sw_fname, ent->pid_file);
1704         if (sprev == NULL)
1705                 SLIST_INSERT_HEAD(&swhead, stmp, sw_nextp);
1706         else
1707                 SLIST_INSERT_AFTER(sprev, stmp, sw_nextp);
1708         return (stmp);
1709 }
1710
1711 /*
1712  * Save information on any file we need to compress.  We may see the same
1713  * file multiple times, so check the full list to avoid duplicates.  The
1714  * list itself is sorted smallest-to-largest, because that's the order we
1715  * want to compress the files.  If the partition is very low on disk space,
1716  * then the smallest files are the most likely to compress, and compressing
1717  * them first will free up more space for the larger files.
1718  */
1719 static struct zipwork_entry *
1720 save_zipwork(const struct conf_entry *ent, const struct sigwork_entry *swork,
1721     int zsize, const char *zipfname)
1722 {
1723         struct zipwork_entry *zprev, *ztmp;
1724         int ndiff;
1725         size_t tmpsiz;
1726
1727         /* Compute the size if the caller did not know it. */
1728         if (zsize < 0)
1729                 zsize = sizefile(zipfname);
1730
1731         zprev = NULL;
1732         ndiff = 1;
1733         SLIST_FOREACH(ztmp, &zwhead, zw_nextp) {
1734                 ndiff = strcmp(zipfname, ztmp->zw_fname);
1735                 if (ndiff == 0)
1736                         break;
1737                 if (zsize > ztmp->zw_fsize)
1738                         zprev = ztmp;
1739         }
1740         if (ztmp != NULL && ndiff == 0)
1741                 return (ztmp);
1742
1743         tmpsiz = sizeof(struct zipwork_entry) + strlen(zipfname) + 1;
1744         ztmp = malloc(tmpsiz);
1745         ztmp->zw_conf = ent;
1746         ztmp->zw_swork = swork;
1747         ztmp->zw_fsize = zsize;
1748         strcpy(ztmp->zw_fname, zipfname);
1749         if (zprev == NULL)
1750                 SLIST_INSERT_HEAD(&zwhead, ztmp, zw_nextp);
1751         else
1752                 SLIST_INSERT_AFTER(zprev, ztmp, zw_nextp);
1753         return (ztmp);
1754 }
1755
1756 /* Send a signal to the pid specified by pidfile */
1757 static void
1758 set_swpid(struct sigwork_entry *swork, const struct conf_entry *ent)
1759 {
1760         FILE *f;
1761         long minok, maxok, rval;
1762         char *endp, *linep, line[BUFSIZ];
1763
1764         minok = MIN_PID;
1765         maxok = MAX_PID;
1766         swork->sw_pidok = 0;
1767         swork->sw_pid = 0;
1768         swork->sw_pidtype = "daemon";
1769         if (ent->flags & CE_SIGNALGROUP) {
1770                 /*
1771                  * If we are expected to signal a process-group when
1772                  * rotating this logfile, then the value read in should
1773                  * be the negative of a valid process ID.
1774                  */
1775                 minok = -MAX_PID;
1776                 maxok = -MIN_PID;
1777                 swork->sw_pidtype = "process-group";
1778         }
1779
1780         f = fopen(ent->pid_file, "r");
1781         if (f == NULL) {
1782                 warn("can't open pid file: %s", ent->pid_file);
1783                 return;
1784         }
1785
1786         if (fgets(line, BUFSIZ, f) == NULL) {
1787                 /*
1788                  * Warn if the PID file is empty, but do not consider
1789                  * it an error.  Most likely it means the process has
1790                  * has terminated, so it should be safe to rotate any
1791                  * log files that the process would have been using.
1792                  */
1793                 if (feof(f)) {
1794                         swork->sw_pidok = 1;
1795                         warnx("pid file is empty: %s", ent->pid_file);
1796                 } else
1797                         warn("can't read from pid file: %s", ent->pid_file);
1798                 (void)fclose(f);
1799                 return;
1800         }
1801         (void)fclose(f);
1802
1803         errno = 0;
1804         linep = line;
1805         while (*linep == ' ')
1806                 linep++;
1807         rval = strtol(linep, &endp, 10);
1808         if (*endp != '\0' && !isspacech(*endp)) {
1809                 warnx("pid file does not start with a valid number: %s",
1810                     ent->pid_file);
1811         } else if (rval < minok || rval > maxok) {
1812                 warnx("bad value '%ld' for process number in %s",
1813                     rval, ent->pid_file);
1814                 if (verbose)
1815                         warnx("\t(expecting value between %ld and %ld)",
1816                             minok, maxok);
1817         } else {
1818                 swork->sw_pidok = 1;
1819                 swork->sw_pid = rval;
1820         }
1821
1822         return;
1823 }
1824
1825 /* Log the fact that the logs were turned over */
1826 static int
1827 log_trim(const char *logname, const struct conf_entry *log_ent)
1828 {
1829         FILE *f;
1830         const char *xtra;
1831
1832         if ((f = fopen(logname, "a")) == NULL)
1833                 return (-1);
1834         xtra = "";
1835         if (log_ent->def_cfg)
1836                 xtra = " using <default> rule";
1837         if (log_ent->firstcreate)
1838                 fprintf(f, "%s %s newsyslog[%d]: logfile first created%s\n",
1839                     daytime, hostname, (int) getpid(), xtra);
1840         else if (log_ent->r_reason != NULL)
1841                 fprintf(f, "%s %s newsyslog[%d]: logfile turned over%s%s\n",
1842                     daytime, hostname, (int) getpid(), log_ent->r_reason, xtra);
1843         else
1844                 fprintf(f, "%s %s newsyslog[%d]: logfile turned over%s\n",
1845                     daytime, hostname, (int) getpid(), xtra);
1846         if (fclose(f) == EOF)
1847                 err(1, "log_trim: fclose");
1848         return (0);
1849 }
1850
1851 /* Return size in kilobytes of a file */
1852 static int
1853 sizefile(const char *file)
1854 {
1855         struct stat sb;
1856
1857         if (stat(file, &sb) < 0)
1858                 return (-1);
1859         return (kbytes(dbtob(sb.st_blocks)));
1860 }
1861
1862 /* Return the age of old log file (file.0) */
1863 static int
1864 age_old_log(char *file)
1865 {
1866         struct stat sb;
1867         char *endp;
1868         char tmp[MAXPATHLEN + sizeof(".0") + sizeof(COMPRESS_POSTFIX) +
1869                 sizeof(BZCOMPRESS_POSTFIX) + 1];
1870
1871         if (archtodir) {
1872                 char *p;
1873
1874                 /* build name of archive directory into tmp */
1875                 if (*archdirname == '/') {      /* absolute */
1876                         strlcpy(tmp, archdirname, sizeof(tmp));
1877                 } else {        /* relative */
1878                         /* get directory part of logfile */
1879                         strlcpy(tmp, file, sizeof(tmp));
1880                         if ((p = rindex(tmp, '/')) == NULL)
1881                                 tmp[0] = '\0';
1882                         else
1883                                 *(p + 1) = '\0';
1884                         strlcat(tmp, archdirname, sizeof(tmp));
1885                 }
1886
1887                 strlcat(tmp, "/", sizeof(tmp));
1888
1889                 /* get filename part of logfile */
1890                 if ((p = rindex(file, '/')) == NULL)
1891                         strlcat(tmp, file, sizeof(tmp));
1892                 else
1893                         strlcat(tmp, p + 1, sizeof(tmp));
1894         } else {
1895                 (void) strlcpy(tmp, file, sizeof(tmp));
1896         }
1897
1898         strlcat(tmp, ".0", sizeof(tmp));
1899         if (stat(tmp, &sb) < 0) {
1900                 /*
1901                  * A plain '.0' file does not exist.  Try again, first
1902                  * with the added suffix of '.gz', then with an added
1903                  * suffix of '.bz2' instead of '.gz'.
1904                  */
1905                 endp = strchr(tmp, '\0');
1906                 strlcat(tmp, COMPRESS_POSTFIX, sizeof(tmp));
1907                 if (stat(tmp, &sb) < 0) {
1908                         *endp = '\0';           /* Remove .gz */
1909                         strlcat(tmp, BZCOMPRESS_POSTFIX, sizeof(tmp));
1910                         if (stat(tmp, &sb) < 0)
1911                                 return (-1);
1912                 }
1913         }
1914         return ((int)(ptimeget_secs(timenow) - sb.st_mtime + 1800) / 3600);
1915 }
1916
1917 /* Skip Over Blanks */
1918 static char *
1919 sob(char *p)
1920 {
1921         while (p && *p && isspace(*p))
1922                 p++;
1923         return (p);
1924 }
1925
1926 /* Skip Over Non-Blanks */
1927 static char *
1928 son(char *p)
1929 {
1930         while (p && *p && !isspace(*p))
1931                 p++;
1932         return (p);
1933 }
1934
1935 /* Check if string is actually a number */
1936 static int
1937 isnumberstr(const char *string)
1938 {
1939         while (*string) {
1940                 if (!isdigitch(*string++))
1941                         return (0);
1942         }
1943         return (1);
1944 }
1945
1946 /*
1947  * Save the active log file under a new name.  A link to the new name
1948  * is the quick-and-easy way to do this.  If that fails (which it will
1949  * if the destination is on another partition), then make a copy of
1950  * the file to the new location.
1951  */
1952 static void
1953 savelog(char *from, char *to)
1954 {
1955         FILE *src, *dst;
1956         int c, res;
1957
1958         res = link(from, to);
1959         if (res == 0)
1960                 return;
1961
1962         if ((src = fopen(from, "r")) == NULL)
1963                 err(1, "can't fopen %s for reading", from);
1964         if ((dst = fopen(to, "w")) == NULL)
1965                 err(1, "can't fopen %s for writing", to);
1966
1967         while ((c = getc(src)) != EOF) {
1968                 if ((putc(c, dst)) == EOF)
1969                         err(1, "error writing to %s", to);
1970         }
1971
1972         if (ferror(src))
1973                 err(1, "error reading from %s", from);
1974         if ((fclose(src)) != 0)
1975                 err(1, "can't fclose %s", to);
1976         if ((fclose(dst)) != 0)
1977                 err(1, "can't fclose %s", from);
1978 }
1979
1980 /* create one or more directory components of a path */
1981 static void
1982 createdir(const struct conf_entry *ent, char *dirpart)
1983 {
1984         int res;
1985         char *s, *d;
1986         char mkdirpath[MAXPATHLEN];
1987         struct stat st;
1988
1989         s = dirpart;
1990         d = mkdirpath;
1991
1992         for (;;) {
1993                 *d++ = *s++;
1994                 if (*s != '/' && *s != '\0')
1995                         continue;
1996                 *d = '\0';
1997                 res = lstat(mkdirpath, &st);
1998                 if (res != 0) {
1999                         if (noaction) {
2000                                 printf("\tmkdir %s\n", mkdirpath);
2001                         } else {
2002                                 res = mkdir(mkdirpath, 0755);
2003                                 if (res != 0)
2004                                         err(1, "Error on mkdir(\"%s\") for -a",
2005                                             mkdirpath);
2006                         }
2007                 }
2008                 if (*s == '\0')
2009                         break;
2010         }
2011         if (verbose) {
2012                 if (ent->firstcreate)
2013                         printf("Created directory '%s' for new %s\n",
2014                             dirpart, ent->log);
2015                 else
2016                         printf("Created directory '%s' for -a\n", dirpart);
2017         }
2018 }
2019
2020 /*
2021  * Create a new log file, destroying any currently-existing version
2022  * of the log file in the process.  If the caller wants a backup copy
2023  * of the file to exist, they should call 'link(logfile,logbackup)'
2024  * before calling this routine.
2025  */
2026 void
2027 createlog(const struct conf_entry *ent)
2028 {
2029         int fd, failed;
2030         struct stat st;
2031         char *realfile, *slash, tempfile[MAXPATHLEN];
2032
2033         fd = -1;
2034         realfile = ent->log;
2035
2036         /*
2037          * If this log file is being created for the first time (-C option),
2038          * then it may also be true that the parent directory does not exist
2039          * yet.  Check, and create that directory if it is missing.
2040          */
2041         if (ent->firstcreate) {
2042                 strlcpy(tempfile, realfile, sizeof(tempfile));
2043                 slash = strrchr(tempfile, '/');
2044                 if (slash != NULL) {
2045                         *slash = '\0';
2046                         failed = stat(tempfile, &st);
2047                         if (failed && errno != ENOENT)
2048                                 err(1, "Error on stat(%s)", tempfile);
2049                         if (failed)
2050                                 createdir(ent, tempfile);
2051                         else if (!S_ISDIR(st.st_mode))
2052                                 errx(1, "%s exists but is not a directory",
2053                                     tempfile);
2054                 }
2055         }
2056
2057         /*
2058          * First create an unused filename, so it can be chown'ed and
2059          * chmod'ed before it is moved into the real location.  mkstemp
2060          * will create the file mode=600 & owned by us.  Note that all
2061          * temp files will have a suffix of '.z<something>'.
2062          */
2063         strlcpy(tempfile, realfile, sizeof(tempfile));
2064         strlcat(tempfile, ".zXXXXXX", sizeof(tempfile));
2065         if (noaction)
2066                 printf("\tmktemp %s\n", tempfile);
2067         else {
2068                 fd = mkstemp(tempfile);
2069                 if (fd < 0)
2070                         err(1, "can't mkstemp logfile %s", tempfile);
2071
2072                 /*
2073                  * Add status message to what will become the new log file.
2074                  */
2075                 if (!(ent->flags & CE_BINARY)) {
2076                         if (log_trim(tempfile, ent))
2077                                 err(1, "can't add status message to log");
2078                 }
2079         }
2080
2081         /* Change the owner/group, if we are supposed to */
2082         if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1) {
2083                 if (noaction)
2084                         printf("\tchown %u:%u %s\n", ent->uid, ent->gid,
2085                             tempfile);
2086                 else {
2087                         failed = fchown(fd, ent->uid, ent->gid);
2088                         if (failed)
2089                                 err(1, "can't fchown temp file %s", tempfile);
2090                 }
2091         }
2092
2093         /* Turn on NODUMP if it was requested in the config-file. */
2094         if (ent->flags & CE_NODUMP) {
2095                 if (noaction)
2096                         printf("\tchflags nodump %s\n", tempfile);
2097                 else {
2098                         failed = fchflags(fd, UF_NODUMP);
2099                         if (failed) {
2100                                 warn("log_trim: fchflags(NODUMP)");
2101                         }
2102                 }
2103         }
2104
2105         /*
2106          * Note that if the real logfile still exists, and if the call
2107          * to rename() fails, then "neither the old file nor the new
2108          * file shall be changed or created" (to quote the standard).
2109          * If the call succeeds, then the file will be replaced without
2110          * any window where some other process might find that the file
2111          * did not exist.
2112          * XXX - ? It may be that for some error conditions, we could
2113          *      retry by first removing the realfile and then renaming.
2114          */
2115         if (noaction) {
2116                 printf("\tchmod %o %s\n", ent->permissions, tempfile);
2117                 printf("\tmv %s %s\n", tempfile, realfile);
2118         } else {
2119                 failed = fchmod(fd, ent->permissions);
2120                 if (failed)
2121                         err(1, "can't fchmod temp file '%s'", tempfile);
2122                 failed = rename(tempfile, realfile);
2123                 if (failed)
2124                         err(1, "can't mv %s to %s", tempfile, realfile);
2125         }
2126
2127         if (fd >= 0)
2128                 close(fd);
2129 }
2130
2131 /*
2132  * Change the attributes of a given filename to what was specified in
2133  * the newsyslog.conf entry.  This routine is only called for files
2134  * that newsyslog expects that it has created, and thus it is a fatal
2135  * error if this routine finds that the file does not exist.
2136  */
2137 static void
2138 change_attrs(const char *fname, const struct conf_entry *ent)
2139 {
2140         int failed;
2141
2142         if (noaction) {
2143                 printf("\tchmod %o %s\n", ent->permissions, fname);
2144
2145                 if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1)
2146                         printf("\tchown %u:%u %s\n",
2147                             ent->uid, ent->gid, fname);
2148
2149                 if (ent->flags & CE_NODUMP)
2150                         printf("\tchflags nodump %s\n", fname);
2151                 return;
2152         }
2153
2154         failed = chmod(fname, ent->permissions);
2155         if (failed) {
2156                 if (errno != EPERM)
2157                         err(1, "chmod(%s) in change_attrs", fname);
2158                 warn("change_attrs couldn't chmod(%s)", fname);
2159         }
2160
2161         if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1) {
2162                 failed = chown(fname, ent->uid, ent->gid);
2163                 if (failed)
2164                         warn("can't chown %s", fname);
2165         }
2166
2167         if (ent->flags & CE_NODUMP) {
2168                 failed = chflags(fname, UF_NODUMP);
2169                 if (failed)
2170                         warn("can't chflags %s NODUMP", fname);
2171         }
2172 }