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  * $FreeBSD: src/usr.sbin/newsyslog/newsyslog.c,v 1.106 2006/07/21 22:13:06 sobomax Exp $
  50  * $DragonFly: src/usr.sbin/newsyslog/newsyslog.c,v 1.6 2007/05/12 08:52:00 swildner Exp $
  51  */
  52
  53 /*
  54  * newsyslog - roll over selected logs at the appropriate time, keeping the a
  55  * specified number of backup files around.
  56  */
  57
  58 #define OSF
  59 #ifndef COMPRESS_POSTFIX
  60 #define COMPRESS_POSTFIX ".gz"
  61 #endif
  62 #ifndef BZCOMPRESS_POSTFIX
  63 #define BZCOMPRESS_POSTFIX ".bz2"
  64 #endif
  65
  66 #include <sys/param.h>
  67 #include <sys/queue.h>
  68 #include <sys/stat.h>
  69 #include <sys/wait.h>
  70
  71 #include <ctype.h>
  72 #include <err.h>
  73 #include <errno.h>
  74 #include <fcntl.h>
  75 #include <fnmatch.h>
  76 #include <glob.h>
  77 #include <grp.h>
  78 #include <paths.h>
  79 #include <pwd.h>
  80 #include <signal.h>
  81 #include <stdio.h>
  82 #include <stdlib.h>
  83 #include <string.h>
  84 #include <time.h>
  85 #include <unistd.h>
  86
  87 #include "pathnames.h"
  88 #include "extern.h"
  89
  90 /*
  91  * Bit-values for the 'flags' parsed from a config-file entry.
  92  */
  93 #define CE_COMPACT      0x0001  /* Compact the achived log files with gzip. */
  94 #define CE_BZCOMPACT    0x0002  /* Compact the achived log files with bzip2. */
  95 #define CE_BINARY       0x0008  /* Logfile is in binary, do not add status */
  96                                 /*    messages to logfile(s) when rotating. */
  97 #define CE_NOSIGNAL     0x0010  /* There is no process to signal when */
  98                                 /*    trimming this file. */
  99 #define CE_TRIMAT       0x0020  /* trim file at a specific time. */
 100 #define CE_GLOB         0x0040  /* name of the log is file name pattern. */
 101 #define CE_SIGNALGROUP  0x0080  /* Signal a process-group instead of a single */
 102                                 /*    process when trimming this file. */
 103 #define CE_CREATE       0x0100  /* Create the log file if it does not exist. */
 104 #define CE_NODUMP       0x0200  /* Set 'nodump' on newly created log file. */
 105
 106 #define MIN_PID         5       /* Don't touch pids lower than this */
 107 #define MAX_PID         99999   /* was lower, see /usr/include/sys/proc.h */
 108
 109 #define kbytes(size)  (((size) + 1023) >> 10)
 110
 111 #define DEFAULT_MARKER  "<default>"
 112 #define DEBUG_MARKER    "<debug>"
 113
 114 struct conf_entry {
 115         char *log;              /* Name of the log */
 116         char *pid_file;         /* PID file */
 117         char *r_reason;         /* The reason this file is being rotated */
 118         int firstcreate;        /* Creating log for the first time (-C). */
 119         int rotate;             /* Non-zero if this file should be rotated */
 120         int fsize;              /* size found for the log file */
 121         uid_t uid;              /* Owner of log */
 122         gid_t gid;              /* Group of log */
 123         int numlogs;            /* Number of logs to keep */
 124         int trsize;             /* Size cutoff to trigger trimming the log */
 125         int hours;              /* Hours between log trimming */
 126         struct ptime_data *trim_at;     /* Specific time to do trimming */
 127         unsigned int permissions;       /* File permissions on the log */
 128         int flags;              /* CE_COMPACT, CE_BZCOMPACT, CE_BINARY */
 129         int sig;                /* Signal to send */
 130         int def_cfg;            /* Using the <default> rule for this file */
 131         struct conf_entry *next;/* Linked list pointer */
 132 };
 133
 134 struct sigwork_entry {
 135         SLIST_ENTRY(sigwork_entry) sw_nextp;
 136         int      sw_signum;             /* the signal to send */
 137         int      sw_pidok;              /* true if pid value is valid */
 138         pid_t    sw_pid;                /* the process id from the PID file */
 139         const char *sw_pidtype;         /* "daemon" or "process group" */
 140         char     sw_fname[1];           /* file the PID was read from */
 141 };
 142
 143 struct zipwork_entry {
 144         SLIST_ENTRY(zipwork_entry) zw_nextp;
 145         const struct conf_entry *zw_conf;       /* for chown/perm/flag info */
 146         const struct sigwork_entry *zw_swork;   /* to know success of signal */
 147         int      zw_fsize;              /* size of the file to compress */
 148         char     zw_fname[1];           /* the file to compress */
 149 };
 150
 151 typedef enum {
 152         FREE_ENT, KEEP_ENT
 153 }       fk_entry;
 154
 155 SLIST_HEAD(swlisthead, sigwork_entry) swhead = SLIST_HEAD_INITIALIZER(swhead);
 156 SLIST_HEAD(zwlisthead, zipwork_entry) zwhead = SLIST_HEAD_INITIALIZER(zwhead);
 157
 158 int dbg_at_times;               /* -D Show details of 'trim_at' code */
 159
 160 int archtodir = 0;              /* Archive old logfiles to other directory */
 161 int createlogs;                 /* Create (non-GLOB) logfiles which do not */
 162                                 /*    already exist.  1=='for entries with */
 163                                 /*    C flag', 2=='for all entries'. */
 164 int verbose = 0;                /* Print out what's going on */
 165 int needroot = 1;               /* Root privs are necessary */
 166 int noaction = 0;               /* Don't do anything, just show it */
 167 int norotate = 0;               /* Don't rotate */
 168 int nosignal;                   /* Do not send any signals */
 169 int force = 0;                  /* Force the trim no matter what */
 170 int rotatereq = 0;              /* -R = Always rotate the file(s) as given */
 171                                 /*    on the command (this also requires   */
 172                                 /*    that a list of files *are* given on  */
 173                                 /*    the run command). */
 174 char *requestor;                /* The name given on a -R request */
 175 char *archdirname;              /* Directory path to old logfiles archive */
 176 char *destdir = NULL;           /* Directory to treat at root for logs */
 177 const char *conf;               /* Configuration file to use */
 178
 179 struct ptime_data *dbg_timenow; /* A "timenow" value set via -D option */
 180 struct ptime_data *timenow;     /* The time to use for checking at-fields */
 181
 182 #define DAYTIME_LEN     16
 183 char daytime[DAYTIME_LEN];      /* The current time in human readable form,
 184                                  * used for rotation-tracking messages. */
 185 char hostname[MAXHOSTNAMELEN];  /* hostname */
 186
 187 static struct conf_entry *get_worklist(char **files);
 188 static void parse_file(FILE *cf, const char *cfname, struct conf_entry **work_p,
 189                 struct conf_entry **glob_p, struct conf_entry **defconf_p);
 190 static char *sob(char *p);
 191 static char *son(char *p);
 192 static int isnumberstr(const char *);
 193 static char *missing_field(char *p, char *errline);
 194 static void      change_attrs(const char *, const struct conf_entry *);
 195 static fk_entry  do_entry(struct conf_entry *);
 196 static fk_entry  do_rotate(const struct conf_entry *);
 197 static void      do_sigwork(struct sigwork_entry *);
 198 static void      do_zipwork(struct zipwork_entry *);
 199 static struct sigwork_entry *
 200                  save_sigwork(const struct conf_entry *);
 201 static struct zipwork_entry *
 202                  save_zipwork(const struct conf_entry *, const struct
 203                     sigwork_entry *, int, const char *);
 204 static void      set_swpid(struct sigwork_entry *, const struct conf_entry *);
 205 static int       sizefile(const char *);
 206 static void expand_globs(struct conf_entry **work_p,
 207                 struct conf_entry **glob_p);
 208 static void free_clist(struct conf_entry **firstent);
 209 static void free_entry(struct conf_entry *ent);
 210 static struct conf_entry *init_entry(const char *fname,
 211                 struct conf_entry *src_entry);
 212 static void parse_args(int argc, char **argv);
 213 static int parse_doption(const char *doption);
 214 static void usage(void);
 215 static int log_trim(const char *logname, const struct conf_entry *log_ent);
 216 static int age_old_log(char *file);
 217 static void savelog(char *from, char *to);
 218 static void createdir(const struct conf_entry *ent, char *dirpart);
 219 static void createlog(const struct conf_entry *ent);
 220
 221 /*
 222  * All the following take a parameter of 'int', but expect values in the
 223  * range of unsigned char.  Define wrappers which take values of type 'char',
 224  * whether signed or unsigned, and ensure they end up in the right range.
 225  */
 226 #define isdigitch(Anychar) isdigit((u_char)(Anychar))
 227 #define isprintch(Anychar) isprint((u_char)(Anychar))
 228 #define isspacech(Anychar) isspace((u_char)(Anychar))
 229 #define tolowerch(Anychar) tolower((u_char)(Anychar))
 230
 231 int
 232 main(int argc, char **argv)
 233 {
 234         fk_entry free_or_keep;
 235         struct conf_entry *p, *q;
 236         struct sigwork_entry *stmp;
 237         struct zipwork_entry *ztmp;
 238
 239         SLIST_INIT(&swhead);
 240         SLIST_INIT(&zwhead);
 241
 242         parse_args(argc, argv);
 243         argc -= optind;
 244         argv += optind;
 245
 246         if (needroot && getuid() && geteuid())
 247                 errx(1, "must have root privs");
 248         p = q = get_worklist(argv);
 249
 250         /*
 251          * Rotate all the files which need to be rotated.  Note that
 252          * some users have *hundreds* of entries in newsyslog.conf!
 253          */
 254         while (p) {
 255                 free_or_keep = do_entry(p);
 256                 p = p->next;
 257                 if (free_or_keep == FREE_ENT)
 258                         free_entry(q);
 259                 q = p;
 260         }
 261
 262         /*
 263          * Send signals to any processes which need a signal to tell
 264          * them to close and re-open the log file(s) we have rotated.
 265          * Note that zipwork_entries include pointers to these
 266          * sigwork_entry's, so we can not free the entries here.
 267          */
 268         if (!SLIST_EMPTY(&swhead)) {
 269                 if (noaction || verbose)
 270                         printf("Signal all daemon process(es)...\n");
 271                 SLIST_FOREACH(stmp, &swhead, sw_nextp)
 272                         do_sigwork(stmp);
 273                 if (noaction)
 274                         printf("\tsleep 10\n");
 275                 else {
 276                         if (verbose)
 277                                 printf("Pause 10 seconds to allow daemon(s)"
 278                                     " to close log file(s)\n");
 279                         sleep(10);
 280                 }
 281         }
 282         /*
 283          * Compress all files that we're expected to compress, now
 284          * that all processes should have closed the files which
 285          * have been rotated.
 286          */
 287         if (!SLIST_EMPTY(&zwhead)) {
 288                 if (noaction || verbose)
 289                         printf("Compress all rotated log file(s)...\n");
 290                 while (!SLIST_EMPTY(&zwhead)) {
 291                         ztmp = SLIST_FIRST(&zwhead);
 292                         do_zipwork(ztmp);
 293                         SLIST_REMOVE_HEAD(&zwhead, zw_nextp);
 294                         free(ztmp);
 295                 }
 296         }
 297         /* Now free all the sigwork entries. */
 298         while (!SLIST_EMPTY(&swhead)) {
 299                 stmp = SLIST_FIRST(&swhead);
 300                 SLIST_REMOVE_HEAD(&swhead, sw_nextp);
 301                 free(stmp);
 302         }
 303
 304         while (wait(NULL) > 0 || errno == EINTR)
 305                 ;
 306         return (0);
 307 }
 308
 309 static struct conf_entry *
 310 init_entry(const char *fname, struct conf_entry *src_entry)
 311 {
 312         struct conf_entry *tempwork;
 313
 314         if (verbose > 4)
 315                 printf("\t--> [creating entry for %s]\n", fname);
 316
 317         tempwork = malloc(sizeof(struct conf_entry));
 318         if (tempwork == NULL)
 319                 err(1, "malloc of conf_entry for %s", fname);
 320
 321         if (destdir == NULL || fname[0] != '/')
 322                 tempwork->log = strdup(fname);
 323         else
 324                 asprintf(&tempwork->log, "%s%s", destdir, fname);
 325         if (tempwork->log == NULL)
 326                 err(1, "strdup for %s", fname);
 327
 328         if (src_entry != NULL) {
 329                 tempwork->pid_file = NULL;
 330                 if (src_entry->pid_file)
 331                         tempwork->pid_file = strdup(src_entry->pid_file);
 332                 tempwork->r_reason = NULL;
 333                 tempwork->firstcreate = 0;
 334                 tempwork->rotate = 0;
 335                 tempwork->fsize = -1;
 336                 tempwork->uid = src_entry->uid;
 337                 tempwork->gid = src_entry->gid;
 338                 tempwork->numlogs = src_entry->numlogs;
 339                 tempwork->trsize = src_entry->trsize;
 340                 tempwork->hours = src_entry->hours;
 341                 tempwork->trim_at = NULL;
 342                 if (src_entry->trim_at != NULL)
 343                         tempwork->trim_at = ptime_init(src_entry->trim_at);
 344                 tempwork->permissions = src_entry->permissions;
 345                 tempwork->flags = src_entry->flags;
 346                 tempwork->sig = src_entry->sig;
 347                 tempwork->def_cfg = src_entry->def_cfg;
 348         } else {
 349                 /* Initialize as a "do-nothing" entry */
 350                 tempwork->pid_file = NULL;
 351                 tempwork->r_reason = NULL;
 352                 tempwork->firstcreate = 0;
 353                 tempwork->rotate = 0;
 354                 tempwork->fsize = -1;
 355                 tempwork->uid = (uid_t)-1;
 356                 tempwork->gid = (gid_t)-1;
 357                 tempwork->numlogs = 1;
 358                 tempwork->trsize = -1;
 359                 tempwork->hours = -1;
 360                 tempwork->trim_at = NULL;
 361                 tempwork->permissions = 0;
 362                 tempwork->flags = 0;
 363                 tempwork->sig = SIGHUP;
 364                 tempwork->def_cfg = 0;
 365         }
 366         tempwork->next = NULL;
 367
 368         return (tempwork);
 369 }
 370
 371 static void
 372 free_entry(struct conf_entry *ent)
 373 {
 374
 375         if (ent == NULL)
 376                 return;
 377
 378         if (ent->log != NULL) {
 379                 if (verbose > 4)
 380                         printf("\t--> [freeing entry for %s]\n", ent->log);
 381                 free(ent->log);
 382                 ent->log = NULL;
 383         }
 384
 385         if (ent->pid_file != NULL) {
 386                 free(ent->pid_file);
 387                 ent->pid_file = NULL;
 388         }
 389
 390         if (ent->r_reason != NULL) {
 391                 free(ent->r_reason);
 392                 ent->r_reason = NULL;
 393         }
 394
 395         if (ent->trim_at != NULL) {
 396                 ptime_free(ent->trim_at);
 397                 ent->trim_at = NULL;
 398         }
 399
 400         free(ent);
 401 }
 402
 403 static void
 404 free_clist(struct conf_entry **firstent)
 405 {
 406         struct conf_entry *ent, *nextent;
 407
 408         if (firstent == NULL)
 409                 return;                 /* There is nothing to do. */
 410
 411         ent = *firstent;
 412         firstent = NULL;
 413
 414         while (ent) {
 415                 nextent = ent->next;
 416                 free_entry(ent);
 417                 ent = nextent;
 418         }
 419 }
 420
 421 static fk_entry
 422 do_entry(struct conf_entry * ent)
 423 {
 424 #define REASON_MAX      80
 425         int modtime;
 426         fk_entry free_or_keep;
 427         double diffsecs;
 428         char temp_reason[REASON_MAX];
 429
 430         free_or_keep = FREE_ENT;
 431         if (verbose) {
 432                 if (ent->flags & CE_COMPACT)
 433                         printf("%s <%dZ>: ", ent->log, ent->numlogs);
 434                 else if (ent->flags & CE_BZCOMPACT)
 435                         printf("%s <%dJ>: ", ent->log, ent->numlogs);
 436                 else
 437                         printf("%s <%d>: ", ent->log, ent->numlogs);
 438         }
 439         ent->fsize = sizefile(ent->log);
 440         modtime = age_old_log(ent->log);
 441         ent->rotate = 0;
 442         ent->firstcreate = 0;
 443         if (ent->fsize < 0) {
 444                 /*
 445                  * If either the C flag or the -C option was specified,
 446                  * and if we won't be creating the file, then have the
 447                  * verbose message include a hint as to why the file
 448                  * will not be created.
 449                  */
 450                 temp_reason[0] = '\0';
 451                 if (createlogs > 1)
 452                         ent->firstcreate = 1;
 453                 else if ((ent->flags & CE_CREATE) && createlogs)
 454                         ent->firstcreate = 1;
 455                 else if (ent->flags & CE_CREATE)
 456                         strlcpy(temp_reason, " (no -C option)", REASON_MAX);
 457                 else if (createlogs)
 458                         strlcpy(temp_reason, " (no C flag)", REASON_MAX);
 459
 460                 if (ent->firstcreate) {
 461                         if (verbose)
 462                                 printf("does not exist -> will create.\n");
 463                         createlog(ent);
 464                 } else if (verbose) {
 465                         printf("does not exist, skipped%s.\n", temp_reason);
 466                 }
 467         } else {
 468                 if (ent->flags & CE_TRIMAT && !force && !rotatereq) {
 469                         diffsecs = ptimeget_diff(timenow, ent->trim_at);
 470                         if (diffsecs < 0.0) {
 471                                 /* trim_at is some time in the future. */
 472                                 if (verbose) {
 473                                         ptime_adjust4dst(ent->trim_at,
 474                                             timenow);
 475                                         printf("--> will trim at %s",
 476                                             ptimeget_ctime(ent->trim_at));
 477                                 }
 478                                 return (free_or_keep);
 479                         } else if (diffsecs >= 3600.0) {
 480                                 /*
 481                                  * trim_at is more than an hour in the past,
 482                                  * so find the next valid trim_at time, and
 483                                  * tell the user what that will be.
 484                                  */
 485                                 if (verbose && dbg_at_times)
 486                                         printf("\n\t--> prev trim at %s\t",
 487                                             ptimeget_ctime(ent->trim_at));
 488                                 if (verbose) {
 489                                         ptimeset_nxtime(ent->trim_at);
 490                                         printf("--> will trim at %s",
 491                                             ptimeget_ctime(ent->trim_at));
 492                                 }
 493                                 return (free_or_keep);
 494                         } else if (verbose && noaction && dbg_at_times) {
 495                                 /*
 496                                  * If we are just debugging at-times, then
 497                                  * a detailed message is helpful.  Also
 498                                  * skip "doing" any commands, since they
 499                                  * would all be turned off by no-action.
 500                                  */
 501                                 printf("\n\t--> timematch at %s",
 502                                     ptimeget_ctime(ent->trim_at));
 503                                 return (free_or_keep);
 504                         } else if (verbose && ent->hours <= 0) {
 505                                 printf("--> time is up\n");
 506                         }
 507                 }
 508                 if (verbose && (ent->trsize > 0))
 509                         printf("size (Kb): %d [%d] ", ent->fsize, ent->trsize);
 510                 if (verbose && (ent->hours > 0))
 511                         printf(" age (hr): %d [%d] ", modtime, ent->hours);
 512
 513                 /*
 514                  * Figure out if this logfile needs to be rotated.
 515                  */
 516                 temp_reason[0] = '\0';
 517                 if (rotatereq) {
 518                         ent->rotate = 1;
 519                         snprintf(temp_reason, REASON_MAX, " due to -R from %s",
 520                             requestor);
 521                 } else if (force) {
 522                         ent->rotate = 1;
 523                         snprintf(temp_reason, REASON_MAX, " due to -F request");
 524                 } else if ((ent->trsize > 0) && (ent->fsize >= ent->trsize)) {
 525                         ent->rotate = 1;
 526                         snprintf(temp_reason, REASON_MAX, " due to size>%dK",
 527                             ent->trsize);
 528                 } else if (ent->hours <= 0 && (ent->flags & CE_TRIMAT)) {
 529                         ent->rotate = 1;
 530                 } else if ((ent->hours > 0) && ((modtime >= ent->hours) ||
 531                     (modtime < 0))) {
 532                         ent->rotate = 1;
 533                 }
 534
 535                 /*
 536                  * If the file needs to be rotated, then rotate it.
 537                  */
 538                 if (ent->rotate && !norotate) {
 539                         if (temp_reason[0] != '\0')
 540                                 ent->r_reason = strdup(temp_reason);
 541                         if (verbose)
 542                                 printf("--> trimming log....\n");
 543                         if (noaction && !verbose) {
 544                                 if (ent->flags & CE_COMPACT)
 545                                         printf("%s <%dZ>: trimming\n",
 546                                             ent->log, ent->numlogs);
 547                                 else if (ent->flags & CE_BZCOMPACT)
 548                                         printf("%s <%dJ>: trimming\n",
 549                                             ent->log, ent->numlogs);
 550                                 else
 551                                         printf("%s <%d>: trimming\n",
 552                                             ent->log, ent->numlogs);
 553                         }
 554                         free_or_keep = do_rotate(ent);
 555                 } else {
 556                         if (verbose)
 557                                 printf("--> skipping\n");
 558                 }
 559         }
 560         return (free_or_keep);
 561 #undef REASON_MAX
 562 }
 563
 564 static void
 565 parse_args(int argc, char **argv)
 566 {
 567         int ch;
 568         char *p;
 569
 570         timenow = ptime_init(NULL);
 571         ptimeset_time(timenow, time(NULL));
 572         strlcpy(daytime, ptimeget_ctime(timenow) + 4, DAYTIME_LEN);
 573
 574         /* Let's get our hostname */
 575         gethostname(hostname, sizeof(hostname));
 576
 577         /* Truncate domain */
 578         if ((p = strchr(hostname, '.')) != NULL)
 579                 *p = '\0';
 580
 581         /* Parse command line options. */
 582         while ((ch = getopt(argc, argv, "a:d:f:nrsvCD:FNR:")) != -1)
 583                 switch (ch) {
 584                 case 'a':
 585                         archtodir++;
 586                         archdirname = optarg;
 587                         break;
 588                 case 'd':
 589                         destdir = optarg;
 590                         break;
 591                 case 'f':
 592                         conf = optarg;
 593                         break;
 594                 case 'n':
 595                         noaction++;
 596                         break;
 597                 case 'r':
 598                         needroot = 0;
 599                         break;
 600                 case 's':
 601                         nosignal = 1;
 602                         break;
 603                 case 'v':
 604                         verbose++;
 605                         break;
 606                 case 'C':
 607                         /* Useful for things like rc.diskless... */
 608                         createlogs++;
 609                         break;
 610                 case 'D':
 611                         /*
 612                          * Set some debugging option.  The specific option
 613                          * depends on the value of optarg.  These options
 614                          * may come and go without notice or documentation.
 615                          */
 616                         if (parse_doption(optarg))
 617                                 break;
 618                         usage();
 619                         /* NOTREACHED */
 620                 case 'F':
 621                         force++;
 622                         break;
 623                 case 'N':
 624                         norotate++;
 625                         break;
 626                 case 'R':
 627                         rotatereq++;
 628                         requestor = strdup(optarg);
 629                         break;
 630                 case 'm':       /* Used by OpenBSD for "monitor mode" */
 631                 default:
 632                         usage();
 633                         /* NOTREACHED */
 634                 }
 635
 636         if (force && norotate) {
 637                 warnx("Only one of -F and -N may be specified.");
 638                 usage();
 639                 /* NOTREACHED */
 640         }
 641
 642         if (rotatereq) {
 643                 if (optind == argc) {
 644                         warnx("At least one filename must be given when -R is specified.");
 645                         usage();
 646                         /* NOTREACHED */
 647                 }
 648                 /* Make sure "requestor" value is safe for a syslog message. */
 649                 for (p = requestor; *p != '\0'; p++) {
 650                         if (!isprintch(*p) && (*p != '\t'))
 651                                 *p = '.';
 652                 }
 653         }
 654
 655         if (dbg_timenow) {
 656                 /*
 657                  * Note that the 'daytime' variable is not changed.
 658                  * That is only used in messages that track when a
 659                  * logfile is rotated, and if a file *is* rotated,
 660                  * then it will still rotated at the "real now" time.
 661                  */
 662                 ptime_free(timenow);
 663                 timenow = dbg_timenow;
 664                 fprintf(stderr, "Debug: Running as if TimeNow is %s",
 665                     ptimeget_ctime(dbg_timenow));
 666         }
 667
 668 }
 669
 670 /*
 671  * These debugging options are mainly meant for developer use, such
 672  * as writing regression-tests.  They would not be needed by users
 673  * during normal operation of newsyslog...
 674  */
 675 static int
 676 parse_doption(const char *doption)
 677 {
 678         const char TN[] = "TN=";
 679         int res;
 680
 681         if (strncmp(doption, TN, sizeof(TN) - 1) == 0) {
 682                 /*
 683                  * The "TimeNow" debugging option.  This might be off
 684                  * by an hour when crossing a timezone change.
 685                  */
 686                 dbg_timenow = ptime_init(NULL);
 687                 res = ptime_relparse(dbg_timenow, PTM_PARSE_ISO8601,
 688                     time(NULL), doption + sizeof(TN) - 1);
 689                 if (res == -2) {
 690                         warnx("Non-existent time specified on -D %s", doption);
 691                         return (0);                     /* failure */
 692                 } else if (res < 0) {
 693                         warnx("Malformed time given on -D %s", doption);
 694                         return (0);                     /* failure */
 695                 }
 696                 return (1);                     /* successfully parsed */
 697
 698         }
 699
 700         if (strcmp(doption, "ats") == 0) {
 701                 dbg_at_times++;
 702                 return (1);                     /* successfully parsed */
 703         }
 704
 705         /* XXX - This check could probably be dropped. */
 706         if ((strcmp(doption, "neworder") == 0) || (strcmp(doption, "oldorder")
 707             == 0)) {
 708                 warnx("NOTE: newsyslog always uses 'neworder'.");
 709                 return (1);                     /* successfully parsed */
 710         }
 711
 712         warnx("Unknown -D (debug) option: '%s'", doption);
 713         return (0);                             /* failure */
 714 }
 715
 716 static void
 717 usage(void)
 718 {
 719
 720         fprintf(stderr,
 721             "usage: newsyslog [-CFNnrsv] [-a directory] [-d directory] [-f config-file]\n"
 722             "                 [ [-R requestor] filename ... ]\n");
 723         exit(1);
 724 }
 725
 726 /*
 727  * Parse a configuration file and return a linked list of all the logs
 728  * which should be processed.
 729  */
 730 static struct conf_entry *
 731 get_worklist(char **files)
 732 {
 733         FILE *f;
 734         const char *fname;
 735         char **given;
 736         struct conf_entry *defconf, *dupent, *ent, *firstnew;
 737         struct conf_entry *globlist, *lastnew, *worklist;
 738         int gmatch, fnres;
 739
 740         defconf = globlist = worklist = NULL;
 741
 742         fname = conf;
 743         if (fname == NULL)
 744                 fname = _PATH_CONF;
 745
 746         if (strcmp(fname, "-") != 0)
 747                 f = fopen(fname, "r");
 748         else {
 749                 f = stdin;
 750                 fname = "<stdin>";
 751         }
 752         if (!f)
 753                 err(1, "%s", fname);
 754
 755         parse_file(f, fname, &worklist, &globlist, &defconf);
 756         fclose(f);
 757
 758         /*
 759          * All config-file information has been read in and turned into
 760          * a worklist and a globlist.  If there were no specific files
 761          * given on the run command, then the only thing left to do is to
 762          * call a routine which finds all files matched by the globlist
 763          * and adds them to the worklist.  Then return the worklist.
 764          */
 765         if (*files == NULL) {
 766                 expand_globs(&worklist, &globlist);
 767                 free_clist(&globlist);
 768                 if (defconf != NULL)
 769                         free_entry(defconf);
 770                 return (worklist);
 771                 /* NOTREACHED */
 772         }
 773
 774         /*
 775          * If newsyslog was given a specific list of files to process,
 776          * it may be that some of those files were not listed in any
 777          * config file.  Those unlisted files should get the default
 778          * rotation action.  First, create the default-rotation action
 779          * if none was found in a system config file.
 780          */
 781         if (defconf == NULL) {
 782                 defconf = init_entry(DEFAULT_MARKER, NULL);
 783                 defconf->numlogs = 3;
 784                 defconf->trsize = 50;
 785                 defconf->permissions = S_IRUSR|S_IWUSR;
 786         }
 787
 788         /*
 789          * If newsyslog was run with a list of specific filenames,
 790          * then create a new worklist which has only those files in
 791          * it, picking up the rotation-rules for those files from
 792          * the original worklist.
 793          *
 794          * XXX - Note that this will copy multiple rules for a single
 795          *      logfile, if multiple entries are an exact match for
 796          *      that file.  That matches the historic behavior, but do
 797          *      we want to continue to allow it?  If so, it should
 798          *      probably be handled more intelligently.
 799          */
 800         firstnew = lastnew = NULL;
 801         for (given = files; *given; ++given) {
 802                 /*
 803                  * First try to find exact-matches for this given file.
 804                  */
 805                 gmatch = 0;
 806                 for (ent = worklist; ent; ent = ent->next) {
 807                         if (strcmp(ent->log, *given) == 0) {
 808                                 gmatch++;
 809                                 dupent = init_entry(*given, ent);
 810                                 if (!firstnew)
 811                                         firstnew = dupent;
 812                                 else
 813                                         lastnew->next = dupent;
 814                                 lastnew = dupent;
 815                         }
 816                 }
 817                 if (gmatch) {
 818                         if (verbose > 2)
 819                                 printf("\t+ Matched entry %s\n", *given);
 820                         continue;
 821                 }
 822
 823                 /*
 824                  * There was no exact-match for this given file, so look
 825                  * for a "glob" entry which does match.
 826                  */
 827                 gmatch = 0;
 828                 if (verbose > 2 && globlist != NULL)
 829                         printf("\t+ Checking globs for %s\n", *given);
 830                 for (ent = globlist; ent; ent = ent->next) {
 831                         fnres = fnmatch(ent->log, *given, FNM_PATHNAME);
 832                         if (verbose > 2)
 833                                 printf("\t+    = %d for pattern %s\n", fnres,
 834                                     ent->log);
 835                         if (fnres == 0) {
 836                                 gmatch++;
 837                                 dupent = init_entry(*given, ent);
 838                                 if (!firstnew)
 839                                         firstnew = dupent;
 840                                 else
 841                                         lastnew->next = dupent;
 842                                 lastnew = dupent;
 843                                 /* This new entry is not a glob! */
 844                                 dupent->flags &= ~CE_GLOB;
 845                                 /* Only allow a match to one glob-entry */
 846                                 break;
 847                         }
 848                 }
 849                 if (gmatch) {
 850                         if (verbose > 2)
 851                                 printf("\t+ Matched %s via %s\n", *given,
 852                                     ent->log);
 853                         continue;
 854                 }
 855
 856                 /*
 857                  * This given file was not found in any config file, so
 858                  * add a worklist item based on the default entry.
 859                  */
 860                 if (verbose > 2)
 861                         printf("\t+ No entry matched %s  (will use %s)\n",
 862                             *given, DEFAULT_MARKER);
 863                 dupent = init_entry(*given, defconf);
 864                 if (!firstnew)
 865                         firstnew = dupent;
 866                 else
 867                         lastnew->next = dupent;
 868                 /* Mark that it was *not* found in a config file */
 869                 dupent->def_cfg = 1;
 870                 lastnew = dupent;
 871         }
 872
 873         /*
 874          * Free all the entries in the original work list, the list of
 875          * glob entries, and the default entry.
 876          */
 877         free_clist(&worklist);
 878         free_clist(&globlist);
 879         free_entry(defconf);
 880
 881         /* And finally, return a worklist which matches the given files. */
 882         return (firstnew);
 883 }
 884
 885 /*
 886  * Expand the list of entries with filename patterns, and add all files
 887  * which match those glob-entries onto the worklist.
 888  */
 889 static void
 890 expand_globs(struct conf_entry **work_p, struct conf_entry **glob_p)
 891 {
 892         int gmatch, gres;
 893         size_t i;
 894         char *mfname;
 895         struct conf_entry *dupent, *ent, *firstmatch, *globent;
 896         struct conf_entry *lastmatch;
 897         glob_t pglob;
 898         struct stat st_fm;
 899
 900         if ((glob_p == NULL) || (*glob_p == NULL))
 901                 return;                 /* There is nothing to do. */
 902
 903         /*
 904          * The worklist contains all fully-specified (non-GLOB) names.
 905          *
 906          * Now expand the list of filename-pattern (GLOB) entries into
 907          * a second list, which (by definition) will only match files
 908          * that already exist.  Do not add a glob-related entry for any
 909          * file which already exists in the fully-specified list.
 910          */
 911         firstmatch = lastmatch = NULL;
 912         for (globent = *glob_p; globent; globent = globent->next) {
 913
 914                 gres = glob(globent->log, GLOB_NOCHECK, NULL, &pglob);
 915                 if (gres != 0) {
 916                         warn("cannot expand pattern (%d): %s", gres,
 917                             globent->log);
 918                         continue;
 919                 }
 920
 921                 if (verbose > 2)
 922                         printf("\t+ Expanding pattern %s\n", globent->log);
 923                 for (i = 0; i < pglob.gl_matchc; i++) {
 924                         mfname = pglob.gl_pathv[i];
 925
 926                         /* See if this file already has a specific entry. */
 927                         gmatch = 0;
 928                         for (ent = *work_p; ent; ent = ent->next) {
 929                                 if (strcmp(mfname, ent->log) == 0) {
 930                                         gmatch++;
 931                                         break;
 932                                 }
 933                         }
 934                         if (gmatch)
 935                                 continue;
 936
 937                         /* Make sure the named matched is a file. */
 938                         gres = lstat(mfname, &st_fm);
 939                         if (gres != 0) {
 940                                 /* Error on a file that glob() matched?!? */
 941                                 warn("Skipping %s - lstat() error", mfname);
 942                                 continue;
 943                         }
 944                         if (!S_ISREG(st_fm.st_mode)) {
 945                                 /* We only rotate files! */
 946                                 if (verbose > 2)
 947                                         printf("\t+  . skipping %s (!file)\n",
 948                                             mfname);
 949                                 continue;
 950                         }
 951
 952                         if (verbose > 2)
 953                                 printf("\t+  . add file %s\n", mfname);
 954                         dupent = init_entry(mfname, globent);
 955                         if (!firstmatch)
 956                                 firstmatch = dupent;
 957                         else
 958                                 lastmatch->next = dupent;
 959                         lastmatch = dupent;
 960                         /* This new entry is not a glob! */
 961                         dupent->flags &= ~CE_GLOB;
 962                 }
 963                 globfree(&pglob);
 964                 if (verbose > 2)
 965                         printf("\t+ Done with pattern %s\n", globent->log);
 966         }
 967
 968         /* Add the list of matched files to the end of the worklist. */
 969         if (!*work_p)
 970                 *work_p = firstmatch;
 971         else {
 972                 ent = *work_p;
 973                 while (ent->next)
 974                         ent = ent->next;
 975                 ent->next = firstmatch;
 976         }
 977
 978 }
 979
 980 /*
 981  * Parse a configuration file and update a linked list of all the logs to
 982  * process.
 983  */
 984 static void
 985 parse_file(FILE *cf, const char *cfname, struct conf_entry **work_p,
 986     struct conf_entry **glob_p, struct conf_entry **defconf_p)
 987 {
 988         char line[BUFSIZ], *parse, *q;
 989         char *cp, *errline, *group;
 990         struct conf_entry *lastglob, *lastwork, *working;
 991         struct passwd *pwd;
 992         struct group *grp;
 993         int eol, ptm_opts, res, special;
 994
 995         /*
 996          * XXX - for now, assume that only one config file will be read,
 997          *      ie, this routine is only called one time.
 998          */
 999         lastglob = lastwork = NULL;
1000
1001         errline = NULL;
1002         while (fgets(line, BUFSIZ, cf)) {
1003                 if ((line[0] == '\n') || (line[0] == '#') ||
1004                     (strlen(line) == 0))
1005                         continue;
1006                 if (errline != NULL)
1007                         free(errline);
1008                 errline = strdup(line);
1009                 for (cp = line + 1; *cp != '\0'; cp++) {
1010                         if (*cp != '#')
1011                                 continue;
1012                         if (*(cp - 1) == '\\') {
1013                                 strcpy(cp - 1, cp);
1014                                 cp--;
1015                                 continue;
1016                         }
1017                         *cp = '\0';
1018                         break;
1019                 }
1020
1021                 q = parse = missing_field(sob(line), errline);
1022                 parse = son(line);
1023                 if (!*parse)
1024                         errx(1, "malformed line (missing fields):\n%s",
1025                             errline);
1026                 *parse = '\0';
1027
1028                 /*
1029                  * Allow people to set debug options via the config file.
1030                  * (NOTE: debug optons are undocumented, and may disappear
1031                  * at any time, etc).
1032                  */
1033                 if (strcasecmp(DEBUG_MARKER, q) == 0) {
1034                         q = parse = missing_field(sob(++parse), errline);
1035                         parse = son(parse);
1036                         if (!*parse)
1037                                 warnx("debug line specifies no option:\n%s",
1038                                     errline);
1039                         else {
1040                                 *parse = '\0';
1041                                 parse_doption(q);
1042                         }
1043                         continue;
1044                 }
1045
1046                 special = 0;
1047                 working = init_entry(q, NULL);
1048                 if (strcasecmp(DEFAULT_MARKER, q) == 0) {
1049                         special = 1;
1050                         if (defconf_p == NULL) {
1051                                 warnx("Ignoring entry for %s in %s!", q,
1052                                     cfname);
1053                                 free_entry(working);
1054                                 continue;
1055                         } else if (*defconf_p != NULL) {
1056                                 warnx("Ignoring duplicate entry for %s!", q);
1057                                 free_entry(working);
1058                                 continue;
1059                         }
1060                         *defconf_p = working;
1061                 }
1062
1063                 q = parse = missing_field(sob(++parse), errline);
1064                 parse = son(parse);
1065                 if (!*parse)
1066                         errx(1, "malformed line (missing fields):\n%s",
1067                             errline);
1068                 *parse = '\0';
1069                 if ((group = strchr(q, ':')) != NULL ||
1070                     (group = strrchr(q, '.')) != NULL) {
1071                         *group++ = '\0';
1072                         if (*q) {
1073                                 if (!(isnumberstr(q))) {
1074                                         if ((pwd = getpwnam(q)) == NULL)
1075                                                 errx(1,
1076                                      "error in config file; unknown user:\n%s",
1077                                                     errline);
1078                                         working->uid = pwd->pw_uid;
1079                                 } else
1080                                         working->uid = atoi(q);
1081                         } else
1082                                 working->uid = (uid_t)-1;
1083
1084                         q = group;
1085                         if (*q) {
1086                                 if (!(isnumberstr(q))) {
1087                                         if ((grp = getgrnam(q)) == NULL)
1088                                                 errx(1,
1089                                     "error in config file; unknown group:\n%s",
1090                                                     errline);
1091                                         working->gid = grp->gr_gid;
1092                                 } else
1093                                         working->gid = atoi(q);
1094                         } else
1095                                 working->gid = (gid_t)-1;
1096
1097                         q = parse = missing_field(sob(++parse), errline);
1098                         parse = son(parse);
1099                         if (!*parse)
1100                                 errx(1, "malformed line (missing fields):\n%s",
1101                                     errline);
1102                         *parse = '\0';
1103                 } else {
1104                         working->uid = (uid_t)-1;
1105                         working->gid = (gid_t)-1;
1106                 }
1107
1108                 if (!sscanf(q, "%o", &working->permissions))
1109                         errx(1, "error in config file; bad permissions:\n%s",
1110                             errline);
1111
1112                 q = parse = missing_field(sob(++parse), errline);
1113                 parse = son(parse);
1114                 if (!*parse)
1115                         errx(1, "malformed line (missing fields):\n%s",
1116                             errline);
1117                 *parse = '\0';
1118                 if (!sscanf(q, "%d", &working->numlogs) || working->numlogs < 0)
1119                         errx(1, "error in config file; bad value for count of logs to save:\n%s",
1120                             errline);
1121
1122                 q = parse = missing_field(sob(++parse), errline);
1123                 parse = son(parse);
1124                 if (!*parse)
1125                         errx(1, "malformed line (missing fields):\n%s",
1126                             errline);
1127                 *parse = '\0';
1128                 if (isdigitch(*q))
1129                         working->trsize = atoi(q);
1130                 else if (strcmp(q, "*") == 0)
1131                         working->trsize = -1;
1132                 else {
1133                         warnx("Invalid value of '%s' for 'size' in line:\n%s",
1134                             q, errline);
1135                         working->trsize = -1;
1136                 }
1137
1138                 working->flags = 0;
1139                 q = parse = missing_field(sob(++parse), errline);
1140                 parse = son(parse);
1141                 eol = !*parse;
1142                 *parse = '\0';
1143                 {
1144                         char *ep;
1145                         u_long ul;
1146
1147                         ul = strtoul(q, &ep, 10);
1148                         if (ep == q)
1149                                 working->hours = 0;
1150                         else if (*ep == '*')
1151                                 working->hours = -1;
1152                         else if (ul > INT_MAX)
1153                                 errx(1, "interval is too large:\n%s", errline);
1154                         else
1155                                 working->hours = ul;
1156
1157                         if (*ep == '\0' || strcmp(ep, "*") == 0)
1158                                 goto no_trimat;
1159                         if (*ep != '@' && *ep != '$')
1160                                 errx(1, "malformed interval/at:\n%s", errline);
1161
1162                         working->flags |= CE_TRIMAT;
1163                         working->trim_at = ptime_init(NULL);
1164                         ptm_opts = PTM_PARSE_ISO8601;
1165                         if (*ep == '$')
1166                                 ptm_opts = PTM_PARSE_DWM;
1167                         ptm_opts |= PTM_PARSE_MATCHDOM;
1168                         res = ptime_relparse(working->trim_at, ptm_opts,
1169                             ptimeget_secs(timenow), ep + 1);
1170                         if (res == -2)
1171                                 errx(1, "nonexistent time for 'at' value:\n%s",
1172                                     errline);
1173                         else if (res < 0)
1174                                 errx(1, "malformed 'at' value:\n%s", errline);
1175                 }
1176 no_trimat:
1177
1178                 if (eol)
1179                         q = NULL;
1180                 else {
1181                         q = parse = sob(++parse);       /* Optional field */
1182                         parse = son(parse);
1183                         if (!*parse)
1184                                 eol = 1;
1185                         *parse = '\0';
1186                 }
1187
1188                 for (; q && *q && !isspacech(*q); q++) {
1189                         switch (tolowerch(*q)) {
1190                         case 'b':
1191                                 working->flags |= CE_BINARY;
1192                                 break;
1193                         case 'c':
1194                                 /*
1195                                  * XXX -        Ick! Ugly! Remove ASAP!
1196                                  * We want `c' and `C' for "create".  But we
1197                                  * will temporarily treat `c' as `g', because
1198                                  * FreeBSD releases <= 4.8 have a typo of
1199                                  * checking  ('G' || 'c')  for CE_GLOB.
1200                                  */
1201                                 if (*q == 'c') {
1202                                         warnx("Assuming 'g' for 'c' in flags for line:\n%s",
1203                                             errline);
1204                                         warnx("The 'c' flag will eventually mean 'CREATE'");
1205                                         working->flags |= CE_GLOB;
1206                                         break;
1207                                 }
1208                                 working->flags |= CE_CREATE;
1209                                 break;
1210                         case 'd':
1211                                 working->flags |= CE_NODUMP;
1212                                 break;
1213                         case 'g':
1214                                 working->flags |= CE_GLOB;
1215                                 break;
1216                         case 'j':
1217                                 working->flags |= CE_BZCOMPACT;
1218                                 break;
1219                         case 'n':
1220                                 working->flags |= CE_NOSIGNAL;
1221                                 break;
1222                         case 'u':
1223                                 working->flags |= CE_SIGNALGROUP;
1224                                 break;
1225                         case 'w':
1226                                 /* Deprecated flag - keep for compatibility purposes */
1227                                 break;
1228                         case 'z':
1229                                 working->flags |= CE_COMPACT;
1230                                 break;
1231                         case '-':
1232                                 break;
1233                         case 'f':       /* Used by OpenBSD for "CE_FOLLOW" */
1234                         case 'm':       /* Used by OpenBSD for "CE_MONITOR" */
1235                         case 'p':       /* Used by NetBSD  for "CE_PLAIN0" */
1236                         default:
1237                                 errx(1, "illegal flag in config file -- %c",
1238                                     *q);
1239                         }
1240                 }
1241
1242                 if (eol)
1243                         q = NULL;
1244                 else {
1245                         q = parse = sob(++parse);       /* Optional field */
1246                         parse = son(parse);
1247                         if (!*parse)
1248                                 eol = 1;
1249                         *parse = '\0';
1250                 }
1251
1252                 working->pid_file = NULL;
1253                 if (q && *q) {
1254                         if (*q == '/')
1255                                 working->pid_file = strdup(q);
1256                         else if (isdigit(*q))
1257                                 goto got_sig;
1258                         else
1259                                 errx(1,
1260                         "illegal pid file or signal number in config file:\n%s",
1261                                     errline);
1262                 }
1263                 if (eol)
1264                         q = NULL;
1265                 else {
1266                         q = parse = sob(++parse);       /* Optional field */
1267                         *(parse = son(parse)) = '\0';
1268                 }
1269
1270                 working->sig = SIGHUP;
1271                 if (q && *q) {
1272                         if (isdigit(*q)) {
1273                 got_sig:
1274                                 working->sig = atoi(q);
1275                         } else {
1276                 err_sig:
1277                                 errx(1,
1278                                     "illegal signal number in config file:\n%s",
1279                                     errline);
1280                         }
1281                         if (working->sig < 1 || working->sig >= NSIG)
1282                                 goto err_sig;
1283                 }
1284
1285                 /*
1286                  * Finish figuring out what pid-file to use (if any) in
1287                  * later processing if this logfile needs to be rotated.
1288                  */
1289                 if ((working->flags & CE_NOSIGNAL) == CE_NOSIGNAL) {
1290                         /*
1291                          * This config-entry specified 'n' for nosignal,
1292                          * see if it also specified an explicit pid_file.
1293                          * This would be a pretty pointless combination.
1294                          */
1295                         if (working->pid_file != NULL) {
1296                                 warnx("Ignoring '%s' because flag 'n' was specified in line:\n%s",
1297                                     working->pid_file, errline);
1298                                 free(working->pid_file);
1299                                 working->pid_file = NULL;
1300                         }
1301                 } else if (working->pid_file == NULL) {
1302                         /*
1303                          * This entry did not specify the 'n' flag, which
1304                          * means it should signal syslogd unless it had
1305                          * specified some other pid-file (and obviously the
1306                          * syslog pid-file will not be for a process-group).
1307                          * Also, we should only try to notify syslog if we
1308                          * are root.
1309                          */
1310                         if (working->flags & CE_SIGNALGROUP) {
1311                                 warnx("Ignoring flag 'U' in line:\n%s",
1312                                     errline);
1313                                 working->flags &= ~CE_SIGNALGROUP;
1314                         }
1315                         if (needroot)
1316                                 working->pid_file = strdup(_PATH_SYSLOGPID);
1317                 }
1318
1319                 /*
1320                  * Add this entry to the appropriate list of entries, unless
1321                  * it was some kind of special entry (eg: <default>).
1322                  */
1323                 if (special) {
1324                         ;                       /* Do not add to any list */
1325                 } else if (working->flags & CE_GLOB) {
1326                         if (!*glob_p)
1327                                 *glob_p = working;
1328                         else
1329                                 lastglob->next = working;
1330                         lastglob = working;
1331                 } else {
1332                         if (!*work_p)
1333                                 *work_p = working;
1334                         else
1335                                 lastwork->next = working;
1336                         lastwork = working;
1337                 }
1338         }
1339         if (errline != NULL)
1340                 free(errline);
1341 }
1342
1343 static char *
1344 missing_field(char *p, char *errline)
1345 {
1346
1347         if (!p || !*p)
1348                 errx(1, "missing field in config file:\n%s", errline);
1349         return (p);
1350 }
1351
1352 static fk_entry
1353 do_rotate(const struct conf_entry *ent)
1354 {
1355         char dirpart[MAXPATHLEN], namepart[MAXPATHLEN];
1356         char file1[MAXPATHLEN], file2[MAXPATHLEN];
1357         char zfile1[MAXPATHLEN], zfile2[MAXPATHLEN];
1358         char jfile1[MAXPATHLEN];
1359         int flags, numlogs_c;
1360         fk_entry free_or_keep;
1361         struct sigwork_entry *swork;
1362         struct stat st;
1363
1364         flags = ent->flags;
1365         free_or_keep = FREE_ENT;
1366
1367         if (archtodir) {
1368                 char *p;
1369
1370                 /* build complete name of archive directory into dirpart */
1371                 if (*archdirname == '/') {      /* absolute */
1372                         strlcpy(dirpart, archdirname, sizeof(dirpart));
1373                 } else {        /* relative */
1374                         /* get directory part of logfile */
1375                         strlcpy(dirpart, ent->log, sizeof(dirpart));
1376                         if ((p = strrchr(dirpart, '/')) == NULL)
1377                                 dirpart[0] = '\0';
1378                         else
1379                                 *(p + 1) = '\0';
1380                         strlcat(dirpart, archdirname, sizeof(dirpart));
1381                 }
1382
1383                 /* check if archive directory exists, if not, create it */
1384                 if (lstat(dirpart, &st))
1385                         createdir(ent, dirpart);
1386
1387                 /* get filename part of logfile */
1388                 if ((p = strrchr(ent->log, '/')) == NULL)
1389                         strlcpy(namepart, ent->log, sizeof(namepart));
1390                 else
1391                         strlcpy(namepart, p + 1, sizeof(namepart));
1392
1393                 /* name of oldest log */
1394                 snprintf(file1, sizeof(file1), "%s/%s.%d", dirpart,
1395                     namepart, ent->numlogs);
1396                 snprintf(zfile1, sizeof(zfile1), "%s%s", file1,
1397                     COMPRESS_POSTFIX);
1398                 snprintf(jfile1, sizeof(jfile1), "%s%s", file1,
1399                     BZCOMPRESS_POSTFIX);
1400         } else {
1401                 /* name of oldest log */
1402                 snprintf(file1, sizeof(file1), "%s.%d", ent->log,
1403                     ent->numlogs);
1404                 snprintf(zfile1, sizeof(zfile1), "%s%s", file1,
1405                     COMPRESS_POSTFIX);
1406                 snprintf(jfile1, sizeof(jfile1), "%s%s", file1,
1407                     BZCOMPRESS_POSTFIX);
1408         }
1409
1410         if (noaction) {
1411                 printf("\trm -f %s\n", file1);
1412                 printf("\trm -f %s\n", zfile1);
1413                 printf("\trm -f %s\n", jfile1);
1414         } else {
1415                 unlink(file1);
1416                 unlink(zfile1);
1417                 unlink(jfile1);
1418         }
1419
1420         /* Move down log files */
1421         numlogs_c = ent->numlogs;               /* copy for countdown */
1422         while (numlogs_c--) {
1423
1424                 strlcpy(file2, file1, sizeof(file2));
1425
1426                 if (archtodir)
1427                         snprintf(file1, sizeof(file1), "%s/%s.%d",
1428                             dirpart, namepart, numlogs_c);
1429                 else
1430                         snprintf(file1, sizeof(file1), "%s.%d", ent->log,
1431                             numlogs_c);
1432
1433                 strlcpy(zfile1, file1, sizeof(zfile1));
1434                 strlcpy(zfile2, file2, sizeof(zfile2));
1435                 if (lstat(file1, &st)) {
1436                         strlcat(zfile1, COMPRESS_POSTFIX,
1437                             sizeof(zfile1));
1438                         strlcat(zfile2, COMPRESS_POSTFIX,
1439                             sizeof(zfile2));
1440                         if (lstat(zfile1, &st)) {
1441                                 strlcpy(zfile1, file1, sizeof(zfile1));
1442                                 strlcpy(zfile2, file2, sizeof(zfile2));
1443                                 strlcat(zfile1, BZCOMPRESS_POSTFIX,
1444                                     sizeof(zfile1));
1445                                 strlcat(zfile2, BZCOMPRESS_POSTFIX,
1446                                     sizeof(zfile2));
1447                                 if (lstat(zfile1, &st))
1448                                         continue;
1449                         }
1450                 }
1451                 if (noaction)
1452                         printf("\tmv %s %s\n", zfile1, zfile2);
1453                 else {
1454                         /* XXX - Ought to be checking for failure! */
1455                         rename(zfile1, zfile2);
1456                 }
1457                 change_attrs(zfile2, ent);
1458         }
1459
1460         if (ent->numlogs > 0) {
1461                 if (noaction) {
1462                         /*
1463                          * Note that savelog() may succeed with using link()
1464                          * for the archtodir case, but there is no good way
1465                          * of knowing if it will when doing "noaction", so
1466                          * here we claim that it will have to do a copy...
1467                          */
1468                         if (archtodir)
1469                                 printf("\tcp %s %s\n", ent->log, file1);
1470                         else
1471                                 printf("\tln %s %s\n", ent->log, file1);
1472                 } else {
1473                         if (!(flags & CE_BINARY)) {
1474                                 /* Report the trimming to the old log */
1475                                 log_trim(ent->log, ent);
1476                         }
1477                         savelog(ent->log, file1);
1478                 }
1479                 change_attrs(file1, ent);
1480         }
1481
1482         /* Create the new log file and move it into place */
1483         if (noaction)
1484                 printf("Start new log...\n");
1485         createlog(ent);
1486
1487         /*
1488          * Save all signalling and file-compression to be done after log
1489          * files from all entries have been rotated.  This way any one
1490          * process will not be sent the same signal multiple times when
1491          * multiple log files had to be rotated.
1492          */
1493         swork = NULL;
1494         if (ent->pid_file != NULL)
1495                 swork = save_sigwork(ent);
1496         if (ent->numlogs > 0 && (flags & (CE_COMPACT | CE_BZCOMPACT))) {
1497                 /*
1498                  * The zipwork_entry will include a pointer to this
1499                  * conf_entry, so the conf_entry should not be freed.
1500                  */
1501                 free_or_keep = KEEP_ENT;
1502                 save_zipwork(ent, swork, ent->fsize, file1);
1503         }
1504
1505         return (free_or_keep);
1506 }
1507
1508 static void
1509 do_sigwork(struct sigwork_entry *swork)
1510 {
1511         struct sigwork_entry *nextsig;
1512         int kres, secs;
1513
1514         if (!(swork->sw_pidok) || swork->sw_pid == 0)
1515                 return;                 /* no work to do... */
1516
1517         /*
1518          * If nosignal (-s) was specified, then do not signal any process.
1519          * Note that a nosignal request triggers a warning message if the
1520          * rotated logfile needs to be compressed, *unless* -R was also
1521          * specified.  We assume that an `-sR' request came from a process
1522          * which writes to the logfile, and as such, we assume that process
1523          * has already made sure the logfile is not presently in use.  This
1524          * just sets swork->sw_pidok to a special value, and do_zipwork
1525          * will print any necessary warning(s).
1526          */
1527         if (nosignal) {
1528                 if (!rotatereq)
1529                         swork->sw_pidok = -1;
1530                 return;
1531         }
1532
1533         /*
1534          * Compute the pause between consecutive signals.  Use a longer
1535          * sleep time if we will be sending two signals to the same
1536          * deamon or process-group.
1537          */
1538         secs = 0;
1539         nextsig = SLIST_NEXT(swork, sw_nextp);
1540         if (nextsig != NULL) {
1541                 if (swork->sw_pid == nextsig->sw_pid)
1542                         secs = 10;
1543                 else
1544                         secs = 1;
1545         }
1546
1547         if (noaction) {
1548                 printf("\tkill -%d %d \t\t# %s\n", swork->sw_signum,
1549                     (int)swork->sw_pid, swork->sw_fname);
1550                 if (secs > 0)
1551                         printf("\tsleep %d\n", secs);
1552                 return;
1553         }
1554
1555         kres = kill(swork->sw_pid, swork->sw_signum);
1556         if (kres != 0) {
1557                 /*
1558                  * Assume that "no such process" (ESRCH) is something
1559                  * to warn about, but is not an error.  Presumably the
1560                  * process which writes to the rotated log file(s) is
1561                  * gone, in which case we should have no problem with
1562                  * compressing the rotated log file(s).
1563                  */
1564                 if (errno != ESRCH)
1565                         swork->sw_pidok = 0;
1566                 warn("can't notify %s, pid %d", swork->sw_pidtype,
1567                     (int)swork->sw_pid);
1568         } else {
1569                 if (verbose)
1570                         printf("Notified %s pid %d = %s\n", swork->sw_pidtype,
1571                             (int)swork->sw_pid, swork->sw_fname);
1572                 if (secs > 0) {
1573                         if (verbose)
1574                                 printf("Pause %d second(s) between signals\n",
1575                                     secs);
1576                         sleep(secs);
1577                 }
1578         }
1579 }
1580
1581 static void
1582 do_zipwork(struct zipwork_entry *zwork)
1583 {
1584         const char *pgm_name, *pgm_path;
1585         int errsav, fcount, zstatus;
1586         pid_t pidzip, wpid;
1587         char zresult[MAXPATHLEN];
1588
1589         pgm_path = NULL;
1590         strlcpy(zresult, zwork->zw_fname, sizeof(zresult));
1591         if (zwork != NULL && zwork->zw_conf != NULL) {
1592                 if (zwork->zw_conf->flags & CE_COMPACT) {
1593                         pgm_path = _PATH_GZIP;
1594                         strlcat(zresult, COMPRESS_POSTFIX, sizeof(zresult));
1595                 } else if (zwork->zw_conf->flags & CE_BZCOMPACT) {
1596                         pgm_path = _PATH_BZIP2;
1597                         strlcat(zresult, BZCOMPRESS_POSTFIX, sizeof(zresult));
1598                 }
1599         }
1600         if (pgm_path == NULL) {
1601                 warnx("invalid entry for %s in do_zipwork", zwork->zw_fname);
1602                 return;
1603         }
1604         pgm_name = strrchr(pgm_path, '/');
1605         if (pgm_name == NULL)
1606                 pgm_name = pgm_path;
1607         else
1608                 pgm_name++;
1609
1610         if (zwork->zw_swork != NULL && zwork->zw_swork->sw_pidok <= 0) {
1611                 warnx(
1612                     "log %s not compressed because daemon(s) not notified",
1613                     zwork->zw_fname);
1614                 change_attrs(zwork->zw_fname, zwork->zw_conf);
1615                 return;
1616         }
1617
1618         if (noaction) {
1619                 printf("\t%s %s\n", pgm_name, zwork->zw_fname);
1620                 change_attrs(zresult, zwork->zw_conf);
1621                 return;
1622         }
1623
1624         fcount = 1;
1625         pidzip = fork();
1626         while (pidzip < 0) {
1627                 /*
1628                  * The fork failed.  If the failure was due to a temporary
1629                  * problem, then wait a short time and try it again.
1630                  */
1631                 errsav = errno;
1632                 warn("fork() for `%s %s'", pgm_name, zwork->zw_fname);
1633                 if (errsav != EAGAIN || fcount > 5)
1634                         errx(1, "Exiting...");
1635                 sleep(fcount * 12);
1636                 fcount++;
1637                 pidzip = fork();
1638         }
1639         if (!pidzip) {
1640                 /* The child process executes the compression command */
1641                 execl(pgm_path, pgm_path, "-f", zwork->zw_fname, NULL);
1642                 err(1, "execl(`%s -f %s')", pgm_path, zwork->zw_fname);
1643         }
1644
1645         wpid = waitpid(pidzip, &zstatus, 0);
1646         if (wpid == -1) {
1647                 /* XXX - should this be a fatal error? */
1648                 warn("%s: waitpid(%d)", pgm_path, pidzip);
1649                 return;
1650         }
1651         if (!WIFEXITED(zstatus)) {
1652                 warnx("`%s -f %s' did not terminate normally", pgm_name,
1653                     zwork->zw_fname);
1654                 return;
1655         }
1656         if (WEXITSTATUS(zstatus)) {
1657                 warnx("`%s -f %s' terminated with a non-zero status (%d)",
1658                     pgm_name, zwork->zw_fname, WEXITSTATUS(zstatus));
1659                 return;
1660         }
1661
1662         /* Compression was successful, set file attributes on the result. */
1663         change_attrs(zresult, zwork->zw_conf);
1664 }
1665
1666 /*
1667  * Save information on any process we need to signal.  Any single
1668  * process may need to be sent different signal-values for different
1669  * log files, but usually a single signal-value will cause the process
1670  * to close and re-open all of it's log files.
1671  */
1672 static struct sigwork_entry *
1673 save_sigwork(const struct conf_entry *ent)
1674 {
1675         struct sigwork_entry *sprev, *stmp;
1676         int ndiff;
1677         size_t tmpsiz;
1678
1679         sprev = NULL;
1680         ndiff = 1;
1681         SLIST_FOREACH(stmp, &swhead, sw_nextp) {
1682                 ndiff = strcmp(ent->pid_file, stmp->sw_fname);
1683                 if (ndiff > 0)
1684                         break;
1685                 if (ndiff == 0) {
1686                         if (ent->sig == stmp->sw_signum)
1687                                 break;
1688                         if (ent->sig > stmp->sw_signum) {
1689                                 ndiff = 1;
1690                                 break;
1691                         }
1692                 }
1693                 sprev = stmp;
1694         }
1695         if (stmp != NULL && ndiff == 0)
1696                 return (stmp);
1697
1698         tmpsiz = sizeof(struct sigwork_entry) + strlen(ent->pid_file) + 1;
1699         stmp = malloc(tmpsiz);
1700         set_swpid(stmp, ent);
1701         stmp->sw_signum = ent->sig;
1702         strcpy(stmp->sw_fname, ent->pid_file);
1703         if (sprev == NULL)
1704                 SLIST_INSERT_HEAD(&swhead, stmp, sw_nextp);
1705         else
1706                 SLIST_INSERT_AFTER(sprev, stmp, sw_nextp);
1707         return (stmp);
1708 }
1709
1710 /*
1711  * Save information on any file we need to compress.  We may see the same
1712  * file multiple times, so check the full list to avoid duplicates.  The
1713  * list itself is sorted smallest-to-largest, because that's the order we
1714  * want to compress the files.  If the partition is very low on disk space,
1715  * then the smallest files are the most likely to compress, and compressing
1716  * them first will free up more space for the larger files.
1717  */
1718 static struct zipwork_entry *
1719 save_zipwork(const struct conf_entry *ent, const struct sigwork_entry *swork,
1720     int zsize, const char *zipfname)
1721 {
1722         struct zipwork_entry *zprev, *ztmp;
1723         int ndiff;
1724         size_t tmpsiz;
1725
1726         /* Compute the size if the caller did not know it. */
1727         if (zsize < 0)
1728                 zsize = sizefile(zipfname);
1729
1730         zprev = NULL;
1731         ndiff = 1;
1732         SLIST_FOREACH(ztmp, &zwhead, zw_nextp) {
1733                 ndiff = strcmp(zipfname, ztmp->zw_fname);
1734                 if (ndiff == 0)
1735                         break;
1736                 if (zsize > ztmp->zw_fsize)
1737                         zprev = ztmp;
1738         }
1739         if (ztmp != NULL && ndiff == 0)
1740                 return (ztmp);
1741
1742         tmpsiz = sizeof(struct zipwork_entry) + strlen(zipfname) + 1;
1743         ztmp = malloc(tmpsiz);
1744         ztmp->zw_conf = ent;
1745         ztmp->zw_swork = swork;
1746         ztmp->zw_fsize = zsize;
1747         strcpy(ztmp->zw_fname, zipfname);
1748         if (zprev == NULL)
1749                 SLIST_INSERT_HEAD(&zwhead, ztmp, zw_nextp);
1750         else
1751                 SLIST_INSERT_AFTER(zprev, ztmp, zw_nextp);
1752         return (ztmp);
1753 }
1754
1755 /* Send a signal to the pid specified by pidfile */
1756 static void
1757 set_swpid(struct sigwork_entry *swork, const struct conf_entry *ent)
1758 {
1759         FILE *f;
1760         long minok, maxok, rval;
1761         char *endp, *linep, line[BUFSIZ];
1762
1763         minok = MIN_PID;
1764         maxok = MAX_PID;
1765         swork->sw_pidok = 0;
1766         swork->sw_pid = 0;
1767         swork->sw_pidtype = "daemon";
1768         if (ent->flags & CE_SIGNALGROUP) {
1769                 /*
1770                  * If we are expected to signal a process-group when
1771                  * rotating this logfile, then the value read in should
1772                  * be the negative of a valid process ID.
1773                  */
1774                 minok = -MAX_PID;
1775                 maxok = -MIN_PID;
1776                 swork->sw_pidtype = "process-group";
1777         }
1778
1779         f = fopen(ent->pid_file, "r");
1780         if (f == NULL) {
1781                 warn("can't open pid file: %s", ent->pid_file);
1782                 return;
1783         }
1784
1785         if (fgets(line, BUFSIZ, f) == NULL) {
1786                 /*
1787                  * Warn if the PID file is empty, but do not consider
1788                  * it an error.  Most likely it means the process has
1789                  * has terminated, so it should be safe to rotate any
1790                  * log files that the process would have been using.
1791                  */
1792                 if (feof(f)) {
1793                         swork->sw_pidok = 1;
1794                         warnx("pid file is empty: %s", ent->pid_file);
1795                 } else
1796                         warn("can't read from pid file: %s", ent->pid_file);
1797                 fclose(f);
1798                 return;
1799         }
1800         fclose(f);
1801
1802         errno = 0;
1803         linep = line;
1804         while (*linep == ' ')
1805                 linep++;
1806         rval = strtol(linep, &endp, 10);
1807         if (*endp != '\0' && !isspacech(*endp)) {
1808                 warnx("pid file does not start with a valid number: %s",
1809                     ent->pid_file);
1810         } else if (rval < minok || rval > maxok) {
1811                 warnx("bad value '%ld' for process number in %s",
1812                     rval, ent->pid_file);
1813                 if (verbose)
1814                         warnx("\t(expecting value between %ld and %ld)",
1815                             minok, maxok);
1816         } else {
1817                 swork->sw_pidok = 1;
1818                 swork->sw_pid = rval;
1819         }
1820
1821         return;
1822 }
1823
1824 /* Log the fact that the logs were turned over */
1825 static int
1826 log_trim(const char *logname, const struct conf_entry *log_ent)
1827 {
1828         FILE *f;
1829         const char *xtra;
1830
1831         if ((f = fopen(logname, "a")) == NULL)
1832                 return (-1);
1833         xtra = "";
1834         if (log_ent->def_cfg)
1835                 xtra = " using <default> rule";
1836         if (log_ent->firstcreate)
1837                 fprintf(f, "%s %s newsyslog[%d]: logfile first created%s\n",
1838                     daytime, hostname, (int) getpid(), xtra);
1839         else if (log_ent->r_reason != NULL)
1840                 fprintf(f, "%s %s newsyslog[%d]: logfile turned over%s%s\n",
1841                     daytime, hostname, (int) getpid(), log_ent->r_reason, xtra);
1842         else
1843                 fprintf(f, "%s %s newsyslog[%d]: logfile turned over%s\n",
1844                     daytime, hostname, (int) getpid(), xtra);
1845         if (fclose(f) == EOF)
1846                 err(1, "log_trim: fclose");
1847         return (0);
1848 }
1849
1850 /* Return size in kilobytes of a file */
1851 static int
1852 sizefile(const char *file)
1853 {
1854         struct stat sb;
1855
1856         if (stat(file, &sb) < 0)
1857                 return (-1);
1858         return (kbytes(dbtob(sb.st_blocks)));
1859 }
1860
1861 /* Return the age of old log file (file.0) */
1862 static int
1863 age_old_log(char *file)
1864 {
1865         struct stat sb;
1866         char *endp;
1867         char tmp[MAXPATHLEN + sizeof(".0") + sizeof(COMPRESS_POSTFIX) +
1868                 sizeof(BZCOMPRESS_POSTFIX) + 1];
1869
1870         if (archtodir) {
1871                 char *p;
1872
1873                 /* build name of archive directory into tmp */
1874                 if (*archdirname == '/') {      /* absolute */
1875                         strlcpy(tmp, archdirname, sizeof(tmp));
1876                 } else {        /* relative */
1877                         /* get directory part of logfile */
1878                         strlcpy(tmp, file, sizeof(tmp));
1879                         if ((p = strrchr(tmp, '/')) == NULL)
1880                                 tmp[0] = '\0';
1881                         else
1882                                 *(p + 1) = '\0';
1883                         strlcat(tmp, archdirname, sizeof(tmp));
1884                 }
1885
1886                 strlcat(tmp, "/", sizeof(tmp));
1887
1888                 /* get filename part of logfile */
1889                 if ((p = strrchr(file, '/')) == NULL)
1890                         strlcat(tmp, file, sizeof(tmp));
1891                 else
1892                         strlcat(tmp, p + 1, sizeof(tmp));
1893         } else {
1894                 strlcpy(tmp, file, sizeof(tmp));
1895         }
1896
1897         strlcat(tmp, ".0", sizeof(tmp));
1898         if (stat(tmp, &sb) < 0) {
1899                 /*
1900                  * A plain '.0' file does not exist.  Try again, first
1901                  * with the added suffix of '.gz', then with an added
1902                  * suffix of '.bz2' instead of '.gz'.
1903                  */
1904                 endp = strchr(tmp, '\0');
1905                 strlcat(tmp, COMPRESS_POSTFIX, sizeof(tmp));
1906                 if (stat(tmp, &sb) < 0) {
1907                         *endp = '\0';           /* Remove .gz */
1908                         strlcat(tmp, BZCOMPRESS_POSTFIX, sizeof(tmp));
1909                         if (stat(tmp, &sb) < 0)
1910                                 return (-1);
1911                 }
1912         }
1913         return ((int)(ptimeget_secs(timenow) - sb.st_mtime + 1800) / 3600);
1914 }
1915
1916 /* Skip Over Blanks */
1917 static char *
1918 sob(char *p)
1919 {
1920         while (p && *p && isspace(*p))
1921                 p++;
1922         return (p);
1923 }
1924
1925 /* Skip Over Non-Blanks */
1926 static char *
1927 son(char *p)
1928 {
1929         while (p && *p && !isspace(*p))
1930                 p++;
1931         return (p);
1932 }
1933
1934 /* Check if string is actually a number */
1935 static int
1936 isnumberstr(const char *string)
1937 {
1938         while (*string) {
1939                 if (!isdigitch(*string++))
1940                         return (0);
1941         }
1942         return (1);
1943 }
1944
1945 /*
1946  * Save the active log file under a new name.  A link to the new name
1947  * is the quick-and-easy way to do this.  If that fails (which it will
1948  * if the destination is on another partition), then make a copy of
1949  * the file to the new location.
1950  */
1951 static void
1952 savelog(char *from, char *to)
1953 {
1954         FILE *src, *dst;
1955         int c, res;
1956
1957         res = link(from, to);
1958         if (res == 0)
1959                 return;
1960
1961         if ((src = fopen(from, "r")) == NULL)
1962                 err(1, "can't fopen %s for reading", from);
1963         if ((dst = fopen(to, "w")) == NULL)
1964                 err(1, "can't fopen %s for writing", to);
1965
1966         while ((c = getc(src)) != EOF) {
1967                 if ((putc(c, dst)) == EOF)
1968                         err(1, "error writing to %s", to);
1969         }
1970
1971         if (ferror(src))
1972                 err(1, "error reading from %s", from);
1973         if ((fclose(src)) != 0)
1974                 err(1, "can't fclose %s", to);
1975         if ((fclose(dst)) != 0)
1976                 err(1, "can't fclose %s", from);
1977 }
1978
1979 /* create one or more directory components of a path */
1980 static void
1981 createdir(const struct conf_entry *ent, char *dirpart)
1982 {
1983         int res;
1984         char *s, *d;
1985         char mkdirpath[MAXPATHLEN];
1986         struct stat st;
1987
1988         s = dirpart;
1989         d = mkdirpath;
1990
1991         for (;;) {
1992                 *d++ = *s++;
1993                 if (*s != '/' && *s != '\0')
1994                         continue;
1995                 *d = '\0';
1996                 res = lstat(mkdirpath, &st);
1997                 if (res != 0) {
1998                         if (noaction) {
1999                                 printf("\tmkdir %s\n", mkdirpath);
2000                         } else {
2001                                 res = mkdir(mkdirpath, 0755);
2002                                 if (res != 0)
2003                                         err(1, "Error on mkdir(\"%s\") for -a",
2004                                             mkdirpath);
2005                         }
2006                 }
2007                 if (*s == '\0')
2008                         break;
2009         }
2010         if (verbose) {
2011                 if (ent->firstcreate)
2012                         printf("Created directory '%s' for new %s\n",
2013                             dirpart, ent->log);
2014                 else
2015                         printf("Created directory '%s' for -a\n", dirpart);
2016         }
2017 }
2018
2019 /*
2020  * Create a new log file, destroying any currently-existing version
2021  * of the log file in the process.  If the caller wants a backup copy
2022  * of the file to exist, they should call 'link(logfile,logbackup)'
2023  * before calling this routine.
2024  */
2025 void
2026 createlog(const struct conf_entry *ent)
2027 {
2028         int fd, failed;
2029         struct stat st;
2030         char *realfile, *slash, tempfile[MAXPATHLEN];
2031
2032         fd = -1;
2033         realfile = ent->log;
2034
2035         /*
2036          * If this log file is being created for the first time (-C option),
2037          * then it may also be true that the parent directory does not exist
2038          * yet.  Check, and create that directory if it is missing.
2039          */
2040         if (ent->firstcreate) {
2041                 strlcpy(tempfile, realfile, sizeof(tempfile));
2042                 slash = strrchr(tempfile, '/');
2043                 if (slash != NULL) {
2044                         *slash = '\0';
2045                         failed = stat(tempfile, &st);
2046                         if (failed && errno != ENOENT)
2047                                 err(1, "Error on stat(%s)", tempfile);
2048                         if (failed)
2049                                 createdir(ent, tempfile);
2050                         else if (!S_ISDIR(st.st_mode))
2051                                 errx(1, "%s exists but is not a directory",
2052                                     tempfile);
2053                 }
2054         }
2055
2056         /*
2057          * First create an unused filename, so it can be chown'ed and
2058          * chmod'ed before it is moved into the real location.  mkstemp
2059          * will create the file mode=600 & owned by us.  Note that all
2060          * temp files will have a suffix of '.z<something>'.
2061          */
2062         strlcpy(tempfile, realfile, sizeof(tempfile));
2063         strlcat(tempfile, ".zXXXXXX", sizeof(tempfile));
2064         if (noaction)
2065                 printf("\tmktemp %s\n", tempfile);
2066         else {
2067                 fd = mkstemp(tempfile);
2068                 if (fd < 0)
2069                         err(1, "can't mkstemp logfile %s", tempfile);
2070
2071                 /*
2072                  * Add status message to what will become the new log file.
2073                  */
2074                 if (!(ent->flags & CE_BINARY)) {
2075                         if (log_trim(tempfile, ent))
2076                                 err(1, "can't add status message to log");
2077                 }
2078         }
2079
2080         /* Change the owner/group, if we are supposed to */
2081         if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1) {
2082                 if (noaction)
2083                         printf("\tchown %u:%u %s\n", ent->uid, ent->gid,
2084                             tempfile);
2085                 else {
2086                         failed = fchown(fd, ent->uid, ent->gid);
2087                         if (failed)
2088                                 err(1, "can't fchown temp file %s", tempfile);
2089                 }
2090         }
2091
2092         /* Turn on NODUMP if it was requested in the config-file. */
2093         if (ent->flags & CE_NODUMP) {
2094                 if (noaction)
2095                         printf("\tchflags nodump %s\n", tempfile);
2096                 else {
2097                         failed = fchflags(fd, UF_NODUMP);
2098                         if (failed) {
2099                                 warn("log_trim: fchflags(NODUMP)");
2100                         }
2101                 }
2102         }
2103
2104         /*
2105          * Note that if the real logfile still exists, and if the call
2106          * to rename() fails, then "neither the old file nor the new
2107          * file shall be changed or created" (to quote the standard).
2108          * If the call succeeds, then the file will be replaced without
2109          * any window where some other process might find that the file
2110          * did not exist.
2111          * XXX - ? It may be that for some error conditions, we could
2112          *      retry by first removing the realfile and then renaming.
2113          */
2114         if (noaction) {
2115                 printf("\tchmod %o %s\n", ent->permissions, tempfile);
2116                 printf("\tmv %s %s\n", tempfile, realfile);
2117         } else {
2118                 failed = fchmod(fd, ent->permissions);
2119                 if (failed)
2120                         err(1, "can't fchmod temp file '%s'", tempfile);
2121                 failed = rename(tempfile, realfile);
2122                 if (failed)
2123                         err(1, "can't mv %s to %s", tempfile, realfile);
2124         }
2125
2126         if (fd >= 0)
2127                 close(fd);
2128 }
2129
2130 /*
2131  * Change the attributes of a given filename to what was specified in
2132  * the newsyslog.conf entry.  This routine is only called for files
2133  * that newsyslog expects that it has created, and thus it is a fatal
2134  * error if this routine finds that the file does not exist.
2135  */
2136 static void
2137 change_attrs(const char *fname, const struct conf_entry *ent)
2138 {
2139         int failed;
2140
2141         if (noaction) {
2142                 printf("\tchmod %o %s\n", ent->permissions, fname);
2143
2144                 if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1)
2145                         printf("\tchown %u:%u %s\n",
2146                             ent->uid, ent->gid, fname);
2147
2148                 if (ent->flags & CE_NODUMP)
2149                         printf("\tchflags nodump %s\n", fname);
2150                 return;
2151         }
2152
2153         failed = chmod(fname, ent->permissions);
2154         if (failed) {
2155                 if (errno != EPERM)
2156                         err(1, "chmod(%s) in change_attrs", fname);
2157                 warn("change_attrs couldn't chmod(%s)", fname);
2158         }
2159
2160         if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1) {
2161                 failed = chown(fname, ent->uid, ent->gid);
2162                 if (failed)
2163                         warn("can't chown %s", fname);
2164         }
2165
2166         if (ent->flags & CE_NODUMP) {
2167                 failed = chflags(fname, UF_NODUMP);
2168                 if (failed)
2169                         warn("can't chflags %s NODUMP", fname);
2170         }
2171 }