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freebsd-skq/usr.sbin/newsyslog/newsyslog.c

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/*
* This file contains changes from the Open Software Foundation.
*/
/*
* Copyright 1988, 1989 by the Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the names of M.I.T. and the M.I.T. S.I.P.B. not be
* used in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. and the M.I.T.
* S.I.P.B. make no representations about the suitability of this software
* for any purpose. It is provided "as is" without express or implied
* warranty.
*
*/
/*
* newsyslog - roll over selected logs at the appropriate time, keeping the a
* specified number of backup files around.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#define OSF
#ifndef COMPRESS_POSTFIX
#define COMPRESS_POSTFIX ".gz"
#endif
#ifndef BZCOMPRESS_POSTFIX
#define BZCOMPRESS_POSTFIX ".bz2"
#endif
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <glob.h>
#include <grp.h>
#include <paths.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "pathnames.h"
#include "extern.h"
/*
* Bit-values for the 'flags' parsed from a config-file entry.
*/
#define CE_COMPACT 0x0001 /* Compact the achived log files with gzip. */
#define CE_BZCOMPACT 0x0002 /* Compact the achived log files with bzip2. */
#define CE_COMPACTWAIT 0x0004 /* wait until compressing one file finishes */
/* before starting the next step. */
#define CE_BINARY 0x0008 /* Logfile is in binary, do not add status */
/* messages to logfile(s) when rotating. */
#define CE_NOSIGNAL 0x0010 /* There is no process to signal when */
/* trimming this file. */
#define CE_TRIMAT 0x0020 /* trim file at a specific time. */
#define CE_GLOB 0x0040 /* name of the log is file name pattern. */
#define CE_SIGNALGROUP 0x0080 /* Signal a process-group instead of a single */
/* process when trimming this file. */
#define CE_CREATE 0x0100 /* Create the log file if it does not exist. */
#define MIN_PID 5 /* Don't touch pids lower than this */
#define MAX_PID 99999 /* was lower, see /usr/include/sys/proc.h */
#define kbytes(size) (((size) + 1023) >> 10)
struct conf_entry {
char *log; /* Name of the log */
char *pid_file; /* PID file */
char *r_reason; /* The reason this file is being rotated */
int firstcreate; /* Creating log for the first time (-C). */
int rotate; /* Non-zero if this file should be rotated */
uid_t uid; /* Owner of log */
gid_t gid; /* Group of log */
int numlogs; /* Number of logs to keep */
int size; /* Size cutoff to trigger trimming the log */
int hours; /* Hours between log trimming */
struct ptime_data *trim_at; /* Specific time to do trimming */
int permissions; /* File permissions on the log */
int flags; /* CE_COMPACT, CE_BZCOMPACT, CE_BINARY */
int sig; /* Signal to send */
int def_cfg; /* Using the <default> rule for this file */
struct conf_entry *next;/* Linked list pointer */
};
#define DEFAULT_MARKER "<default>"
int dbg_at_times; /* -D Show details of 'trim_at' code */
int archtodir = 0; /* Archive old logfiles to other directory */
int createlogs; /* Create (non-GLOB) logfiles which do not */
/* already exist. 1=='for entries with */
/* C flag', 2=='for all entries'. */
int verbose = 0; /* Print out what's going on */
int needroot = 1; /* Root privs are necessary */
int noaction = 0; /* Don't do anything, just show it */
int nosignal; /* Do not send any signals */
int force = 0; /* Force the trim no matter what */
int rotatereq = 0; /* -R = Always rotate the file(s) as given */
/* on the command (this also requires */
/* that a list of files *are* given on */
/* the run command). */
char *requestor; /* The name given on a -R request */
char *archdirname; /* Directory path to old logfiles archive */
const char *conf; /* Configuration file to use */
struct ptime_data *dbg_timenow; /* A "timenow" value set via -D option */
struct ptime_data *timenow; /* The time to use for checking at-fields */
char hostname[MAXHOSTNAMELEN]; /* hostname */
char daytime[16]; /* The current time in human readable form,
* used for rotation-tracking messages. */
static struct conf_entry *get_worklist(char **files);
static void parse_file(FILE *cf, const char *cfname, struct conf_entry **work_p,
struct conf_entry **glob_p, struct conf_entry **defconf_p);
static char *sob(char *p);
static char *son(char *p);
static int isnumberstr(const char *);
static char *missing_field(char *p, char *errline);
static void do_entry(struct conf_entry * ent);
static void expand_globs(struct conf_entry **work_p,
struct conf_entry **glob_p);
static void free_clist(struct conf_entry **firstent);
static void free_entry(struct conf_entry *ent);
static struct conf_entry *init_entry(const char *fname,
struct conf_entry *src_entry);
static void parse_args(int argc, char **argv);
static int parse_doption(const char *doption);
static void usage(void);
static void dotrim(const struct conf_entry *ent);
static int log_trim(const char *logname, const struct conf_entry *log_ent);
static void compress_log(char *logname, int dowait);
static void bzcompress_log(char *logname, int dowait);
static int sizefile(char *file);
static int age_old_log(char *file);
static int send_signal(const struct conf_entry *ent);
static void movefile(char *from, char *to, int perm, uid_t owner_uid,
gid_t group_gid);
static void createdir(const struct conf_entry *ent, char *dirpart);
static void createlog(const struct conf_entry *ent);
/*
* All the following are defined to work on an 'int', in the
* range 0 to 255, plus EOF. Define wrappers which can take
* values of type 'char', either signed or unsigned.
*/
#define isdigitch(Anychar) isdigit(((int) Anychar) & 255)
#define isprintch(Anychar) isprint(((int) Anychar) & 255)
#define isspacech(Anychar) isspace(((int) Anychar) & 255)
#define tolowerch(Anychar) tolower(((int) Anychar) & 255)
int
main(int argc, char **argv)
{
struct conf_entry *p, *q;
parse_args(argc, argv);
argc -= optind;
argv += optind;
if (needroot && getuid() && geteuid())
errx(1, "must have root privs");
p = q = get_worklist(argv);
while (p) {
do_entry(p);
p = p->next;
free_entry(q);
q = p;
}
while (wait(NULL) > 0 || errno == EINTR)
;
return (0);
}
static struct conf_entry *
init_entry(const char *fname, struct conf_entry *src_entry)
{
struct conf_entry *tempwork;
if (verbose > 4)
printf("\t--> [creating entry for %s]\n", fname);
tempwork = malloc(sizeof(struct conf_entry));
if (tempwork == NULL)
err(1, "malloc of conf_entry for %s", fname);
tempwork->log = strdup(fname);
if (tempwork->log == NULL)
err(1, "strdup for %s", fname);
if (src_entry != NULL) {
tempwork->pid_file = NULL;
if (src_entry->pid_file)
tempwork->pid_file = strdup(src_entry->pid_file);
tempwork->r_reason = NULL;
tempwork->firstcreate = 0;
tempwork->rotate = 0;
tempwork->uid = src_entry->uid;
tempwork->gid = src_entry->gid;
tempwork->numlogs = src_entry->numlogs;
tempwork->size = src_entry->size;
tempwork->hours = src_entry->hours;
tempwork->trim_at = NULL;
if (src_entry->trim_at != NULL)
tempwork->trim_at = ptime_init(src_entry->trim_at);
tempwork->permissions = src_entry->permissions;
tempwork->flags = src_entry->flags;
tempwork->sig = src_entry->sig;
tempwork->def_cfg = src_entry->def_cfg;
} else {
/* Initialize as a "do-nothing" entry */
tempwork->pid_file = NULL;
tempwork->r_reason = NULL;
tempwork->firstcreate = 0;
tempwork->rotate = 0;
tempwork->uid = (uid_t)-1;
tempwork->gid = (gid_t)-1;
tempwork->numlogs = 1;
tempwork->size = -1;
tempwork->hours = -1;
tempwork->trim_at = NULL;
tempwork->permissions = 0;
tempwork->flags = 0;
tempwork->sig = SIGHUP;
tempwork->def_cfg = 0;
}
tempwork->next = NULL;
return (tempwork);
}
static void
free_entry(struct conf_entry *ent)
{
if (ent == NULL)
return;
if (ent->log != NULL) {
if (verbose > 4)
printf("\t--> [freeing entry for %s]\n", ent->log);
free(ent->log);
ent->log = NULL;
}
if (ent->pid_file != NULL) {
free(ent->pid_file);
ent->pid_file = NULL;
}
if (ent->r_reason != NULL) {
free(ent->r_reason);
ent->r_reason = NULL;
}
if (ent->trim_at != NULL) {
ptime_free(ent->trim_at);
ent->trim_at = NULL;
}
free(ent);
}
static void
free_clist(struct conf_entry **firstent)
{
struct conf_entry *ent, *nextent;
if (firstent == NULL)
return; /* There is nothing to do. */
ent = *firstent;
firstent = NULL;
while (ent) {
nextent = ent->next;
free_entry(ent);
ent = nextent;
}
}
static void
do_entry(struct conf_entry * ent)
{
#define REASON_MAX 80
int size, modtime;
double diffsecs;
char temp_reason[REASON_MAX];
if (verbose) {
if (ent->flags & CE_COMPACT)
printf("%s <%dZ>: ", ent->log, ent->numlogs);
else if (ent->flags & CE_BZCOMPACT)
printf("%s <%dJ>: ", ent->log, ent->numlogs);
else
printf("%s <%d>: ", ent->log, ent->numlogs);
}
size = sizefile(ent->log);
modtime = age_old_log(ent->log);
ent->rotate = 0;
ent->firstcreate = 0;
if (size < 0) {
/*
* If either the C flag or the -C option was specified,
* and if we won't be creating the file, then have the
* verbose message include a hint as to why the file
* will not be created.
*/
temp_reason[0] = '\0';
if (createlogs > 1)
ent->firstcreate = 1;
else if ((ent->flags & CE_CREATE) && createlogs)
ent->firstcreate = 1;
else if (ent->flags & CE_CREATE)
strncpy(temp_reason, " (no -C option)", REASON_MAX);
else if (createlogs)
strncpy(temp_reason, " (no C flag)", REASON_MAX);
if (ent->firstcreate) {
if (verbose)
printf("does not exist -> will create.\n");
createlog(ent);
} else if (verbose) {
printf("does not exist, skipped%s.\n", temp_reason);
}
} else {
if (ent->flags & CE_TRIMAT && !force && !rotatereq) {
diffsecs = ptimeget_diff(timenow, ent->trim_at);
if (diffsecs < 0.0) {
/* trim_at is some time in the future. */
if (verbose) {
ptime_adjust4dst(ent->trim_at,
timenow);
printf("--> will trim at %s",
ptimeget_ctime(ent->trim_at));
}
return;
} else if (diffsecs >= 3600.0) {
/*
* trim_at is more than an hour in the past,
* so find the next valid trim_at time, and
* tell the user what that will be.
*/
if (verbose && dbg_at_times)
printf("\n\t--> prev trim at %s\t",
ptimeget_ctime(ent->trim_at));
if (verbose) {
ptimeset_nxtime(ent->trim_at);
printf("--> will trim at %s",
ptimeget_ctime(ent->trim_at));
}
return;
} else if (verbose && noaction && dbg_at_times) {
/*
* If we are just debugging at-times, then
* a detailed message is helpful. Also
* skip "doing" any commands, since they
* would all be turned off by no-action.
*/
printf("\n\t--> timematch at %s",
ptimeget_ctime(ent->trim_at));
return;
} else if (verbose && ent->hours <= 0) {
printf("--> time is up\n");
}
}
if (verbose && (ent->size > 0))
printf("size (Kb): %d [%d] ", size, ent->size);
if (verbose && (ent->hours > 0))
printf(" age (hr): %d [%d] ", modtime, ent->hours);
/*
* Figure out if this logfile needs to be rotated.
*/
temp_reason[0] = '\0';
if (rotatereq) {
ent->rotate = 1;
snprintf(temp_reason, REASON_MAX, " due to -R from %s",
requestor);
} else if (force) {
ent->rotate = 1;
snprintf(temp_reason, REASON_MAX, " due to -F request");
} else if ((ent->size > 0) && (size >= ent->size)) {
ent->rotate = 1;
snprintf(temp_reason, REASON_MAX, " due to size>%dK",
ent->size);
} else if (ent->hours <= 0 && (ent->flags & CE_TRIMAT)) {
ent->rotate = 1;
} else if ((ent->hours > 0) && ((modtime >= ent->hours) ||
(modtime < 0))) {
ent->rotate = 1;
}
/*
* If the file needs to be rotated, then rotate it.
*/
if (ent->rotate) {
if (temp_reason[0] != '\0')
ent->r_reason = strdup(temp_reason);
if (verbose)
printf("--> trimming log....\n");
if (noaction && !verbose) {
if (ent->flags & CE_COMPACT)
printf("%s <%dZ>: trimming\n",
ent->log, ent->numlogs);
else if (ent->flags & CE_BZCOMPACT)
printf("%s <%dJ>: trimming\n",
ent->log, ent->numlogs);
else
printf("%s <%d>: trimming\n",
ent->log, ent->numlogs);
}
dotrim(ent);
} else {
if (verbose)
printf("--> skipping\n");
}
}
#undef REASON_MAX
}
/* Send a signal to the pid specified by pidfile */
static int
send_signal(const struct conf_entry *ent)
{
pid_t target_pid;
int did_notify;
FILE *f;
long minok, maxok, rval;
const char *target_name;
char *endp, *linep, line[BUFSIZ];
did_notify = 0;
f = fopen(ent->pid_file, "r");
if (f == NULL) {
warn("can't open pid file: %s", ent->pid_file);
return (did_notify);
/* NOTREACHED */
}
if (fgets(line, BUFSIZ, f) == NULL) {
/*
* XXX - If the pid file is empty, is that really a
* problem? Wouldn't that mean that the process
* has shut down? In that case there would be no
* problem with compressing the rotated log file.
*/
if (feof(f))
warnx("pid file is empty: %s", ent->pid_file);
else
warn("can't read from pid file: %s", ent->pid_file);
(void) fclose(f);
return (did_notify);
/* NOTREACHED */
}
(void) fclose(f);
target_name = "daemon";
minok = MIN_PID;
maxok = MAX_PID;
if (ent->flags & CE_SIGNALGROUP) {
/*
* If we are expected to signal a process-group when
* rotating this logfile, then the value read in should
* be the negative of a valid process ID.
*/
target_name = "process-group";
minok = -MAX_PID;
maxok = -MIN_PID;
}
errno = 0;
linep = line;
while (*linep == ' ')
linep++;
rval = strtol(linep, &endp, 10);
if (*endp != '\0' && !isspacech(*endp)) {
warnx("pid file does not start with a valid number: %s",
ent->pid_file);
rval = 0;
} else if (rval < minok || rval > maxok) {
warnx("bad value '%ld' for process number in %s",
rval, ent->pid_file);
if (verbose)
warnx("\t(expecting value between %ld and %ld)",
minok, maxok);
rval = 0;
}
if (rval == 0) {
return (did_notify);
/* NOTREACHED */
}
target_pid = rval;
if (noaction) {
did_notify = 1;
printf("\tkill -%d %d\n", ent->sig, (int) target_pid);
} else if (kill(target_pid, ent->sig)) {
/*
* XXX - Iff the error was "no such process", should that
* really be an error for us? Perhaps the process
* is already gone, in which case there would be no
* problem with compressing the rotated log file.
*/
warn("can't notify %s, pid %d", target_name,
(int) target_pid);
} else {
did_notify = 1;
if (verbose)
printf("%s pid %d notified\n", target_name,
(int) target_pid);
}
return (did_notify);
}
static void
parse_args(int argc, char **argv)
{
int ch;
char *p;
timenow = ptime_init(NULL);
ptimeset_time(timenow, time(NULL));
(void)strncpy(daytime, ptimeget_ctime(timenow) + 4, 15);
daytime[15] = '\0';
/* Let's get our hostname */
(void)gethostname(hostname, sizeof(hostname));
/* Truncate domain */
if ((p = strchr(hostname, '.')) != NULL)
*p = '\0';
/* Parse command line options. */
while ((ch = getopt(argc, argv, "a:f:nrsvCD:FR:")) != -1)
switch (ch) {
case 'a':
archtodir++;
archdirname = optarg;
break;
case 'f':
conf = optarg;
break;
case 'n':
noaction++;
break;
case 'r':
needroot = 0;
break;
case 's':
nosignal = 1;
break;
case 'v':
verbose++;
break;
case 'C':
/* Useful for things like rc.diskless... */
createlogs++;
break;
case 'D':
/*
* Set some debugging option. The specific option
* depends on the value of optarg. These options
* may come and go without notice or documentation.
*/
if (parse_doption(optarg))
break;
usage();
/* NOTREACHED */
case 'F':
force++;
break;
case 'R':
rotatereq++;
requestor = strdup(optarg);
break;
case 'm': /* Used by OpenBSD for "monitor mode" */
default:
usage();
/* NOTREACHED */
}
if (rotatereq) {
if (optind == argc) {
warnx("At least one filename must be given when -R is specified.");
usage();
/* NOTREACHED */
}
/* Make sure "requestor" value is safe for a syslog message. */
for (p = requestor; *p != '\0'; p++) {
if (!isprintch(*p) && (*p != '\t'))
*p = '.';
}
}
if (dbg_timenow) {
/*
* Note that the 'daytime' variable is not changed.
* That is only used in messages that track when a
* logfile is rotated, and if a file *is* rotated,
* then it will still rotated at the "real now" time.
*/
ptime_free(timenow);
timenow = dbg_timenow;
fprintf(stderr, "Debug: Running as if TimeNow is %s",
ptimeget_ctime(dbg_timenow));
}
}
/*
* These debugging options are mainly meant for developer use, such
* as writing regression-tests. They would not be needed by users
* during normal operation of newsyslog...
*/
static int
parse_doption(const char *doption)
{
const char TN[] = "TN=";
int res;
if (strncmp(doption, TN, sizeof(TN) - 1) == 0) {
/*
* The "TimeNow" debugging option. This might be off
* by an hour when crossing a timezone change.
*/
dbg_timenow = ptime_init(NULL);
res = ptime_relparse(dbg_timenow, PTM_PARSE_ISO8601,
time(NULL), doption + sizeof(TN) - 1);
if (res == -2) {
warnx("Non-existent time specified on -D %s", doption);
return (0); /* failure */
} else if (res < 0) {
warnx("Malformed time given on -D %s", doption);
return (0); /* failure */
}
return (1); /* successfully parsed */
}
if (strcmp(doption, "ats") == 0) {
dbg_at_times++;
return (1); /* successfully parsed */
}
warnx("Unknown -D (debug) option: %s", doption);
return (0); /* failure */
}
static void
usage(void)
{
fprintf(stderr,
"usage: newsyslog [-CFnrsv] [-a directory] [-f config-file]\n"
" [ [-R requestor] filename ... ]\n");
exit(1);
}
/*
* Parse a configuration file and return a linked list of all the logs
* which should be processed.
*/
static struct conf_entry *
get_worklist(char **files)
{
FILE *f;
const char *fname;
char **given;
struct conf_entry *defconf, *dupent, *ent, *firstnew;
struct conf_entry *globlist, *lastnew, *worklist;
int gmatch, fnres;
defconf = globlist = worklist = NULL;
fname = conf;
if (fname == NULL)
fname = _PATH_CONF;
if (strcmp(fname, "-") != 0)
f = fopen(fname, "r");
else {
f = stdin;
fname = "<stdin>";
}
if (!f)
err(1, "%s", conf);
parse_file(f, fname, &worklist, &globlist, &defconf);
(void) fclose(f);
/*
* All config-file information has been read in and turned into
* a worklist and a globlist. If there were no specific files
* given on the run command, then the only thing left to do is to
* call a routine which finds all files matched by the globlist
* and adds them to the worklist. Then return the worklist.
*/
if (*files == NULL) {
expand_globs(&worklist, &globlist);
free_clist(&globlist);
if (defconf != NULL)
free_entry(defconf);
return (worklist);
/* NOTREACHED */
}
/*
* If newsyslog was given a specific list of files to process,
* it may be that some of those files were not listed in any
* config file. Those unlisted files should get the default
* rotation action. First, create the default-rotation action
* if none was found in a system config file.
*/
if (defconf == NULL) {
defconf = init_entry(DEFAULT_MARKER, NULL);
defconf->numlogs = 3;
defconf->size = 50;
defconf->permissions = S_IRUSR|S_IWUSR;
}
/*
* If newsyslog was run with a list of specific filenames,
* then create a new worklist which has only those files in
* it, picking up the rotation-rules for those files from
* the original worklist.
*
* XXX - Note that this will copy multiple rules for a single
* logfile, if multiple entries are an exact match for
* that file. That matches the historic behavior, but do
* we want to continue to allow it? If so, it should
* probably be handled more intelligently.
*/
firstnew = lastnew = NULL;
for (given = files; *given; ++given) {
/*
* First try to find exact-matches for this given file.
*/
gmatch = 0;
for (ent = worklist; ent; ent = ent->next) {
if (strcmp(ent->log, *given) == 0) {
gmatch++;
dupent = init_entry(*given, ent);
if (!firstnew)
firstnew = dupent;
else
lastnew->next = dupent;
lastnew = dupent;
}
}
if (gmatch) {
if (verbose > 2)
printf("\t+ Matched entry %s\n", *given);
continue;
}
/*
* There was no exact-match for this given file, so look
* for a "glob" entry which does match.
*/
gmatch = 0;
if (verbose > 2 && globlist != NULL)
printf("\t+ Checking globs for %s\n", *given);
for (ent = globlist; ent; ent = ent->next) {
fnres = fnmatch(ent->log, *given, FNM_PATHNAME);
if (verbose > 2)
printf("\t+ = %d for pattern %s\n", fnres,
ent->log);
if (fnres == 0) {
gmatch++;
dupent = init_entry(*given, ent);
if (!firstnew)
firstnew = dupent;
else
lastnew->next = dupent;
lastnew = dupent;
/* This new entry is not a glob! */
dupent->flags &= ~CE_GLOB;
/* Only allow a match to one glob-entry */
break;
}
}
if (gmatch) {
if (verbose > 2)
printf("\t+ Matched %s via %s\n", *given,
ent->log);
continue;
}
/*
* This given file was not found in any config file, so
* add a worklist item based on the default entry.
*/
if (verbose > 2)
printf("\t+ No entry matched %s (will use %s)\n",
*given, DEFAULT_MARKER);
dupent = init_entry(*given, defconf);
if (!firstnew)
firstnew = dupent;
else
lastnew->next = dupent;
/* Mark that it was *not* found in a config file */
dupent->def_cfg = 1;
lastnew = dupent;
}
/*
* Free all the entries in the original work list, the list of
* glob entries, and the default entry.
*/
free_clist(&worklist);
free_clist(&globlist);
free_entry(defconf);
/* And finally, return a worklist which matches the given files. */
return (firstnew);
}
/*
* Expand the list of entries with filename patterns, and add all files
* which match those glob-entries onto the worklist.
*/
static void
expand_globs(struct conf_entry **work_p, struct conf_entry **glob_p)
{
int gmatch, gres, i;
char *mfname;
struct conf_entry *dupent, *ent, *firstmatch, *globent;
struct conf_entry *lastmatch;
glob_t pglob;
struct stat st_fm;
if ((glob_p == NULL) || (*glob_p == NULL))
return; /* There is nothing to do. */
/*
* The worklist contains all fully-specified (non-GLOB) names.
*
* Now expand the list of filename-pattern (GLOB) entries into
* a second list, which (by definition) will only match files
* that already exist. Do not add a glob-related entry for any
* file which already exists in the fully-specified list.
*/
firstmatch = lastmatch = NULL;
for (globent = *glob_p; globent; globent = globent->next) {
gres = glob(globent->log, GLOB_NOCHECK, NULL, &pglob);
if (gres != 0) {
warn("cannot expand pattern (%d): %s", gres,
globent->log);
continue;
}
if (verbose > 2)
printf("\t+ Expanding pattern %s\n", globent->log);
for (i = 0; i < pglob.gl_matchc; i++) {
mfname = pglob.gl_pathv[i];
/* See if this file already has a specific entry. */
gmatch = 0;
for (ent = *work_p; ent; ent = ent->next) {
if (strcmp(mfname, ent->log) == 0) {
gmatch++;
break;
}
}
if (gmatch)
continue;
/* Make sure the named matched is a file. */
gres = lstat(mfname, &st_fm);
if (gres != 0) {
/* Error on a file that glob() matched?!? */
warn("Skipping %s - lstat() error", mfname);
continue;
}
if (!S_ISREG(st_fm.st_mode)) {
/* We only rotate files! */
if (verbose > 2)
printf("\t+ . skipping %s (!file)\n",
mfname);
continue;
}
if (verbose > 2)
printf("\t+ . add file %s\n", mfname);
dupent = init_entry(mfname, globent);
if (!firstmatch)
firstmatch = dupent;
else
lastmatch->next = dupent;
lastmatch = dupent;
/* This new entry is not a glob! */
dupent->flags &= ~CE_GLOB;
}
globfree(&pglob);
if (verbose > 2)
printf("\t+ Done with pattern %s\n", globent->log);
}
/* Add the list of matched files to the end of the worklist. */
if (!*work_p)
*work_p = firstmatch;
else {
ent = *work_p;
while (ent->next)
ent = ent->next;
ent->next = firstmatch;
}
}
/*
* Parse a configuration file and update a linked list of all the logs to
* process.
*/
static void
parse_file(FILE *cf, const char *cfname, struct conf_entry **work_p,
struct conf_entry **glob_p, struct conf_entry **defconf_p)
{
char line[BUFSIZ], *parse, *q;
char *cp, *errline, *group;
struct conf_entry *lastglob, *lastwork, *working;
struct passwd *pwd;
struct group *grp;
int eol, ptm_opts, res, special;
/*
* XXX - for now, assume that only one config file will be read,
* ie, this routine is only called one time.
*/
lastglob = lastwork = NULL;
while (fgets(line, BUFSIZ, cf)) {
if ((line[0] == '\n') || (line[0] == '#') ||
(strlen(line) == 0))
continue;
errline = strdup(line);
for (cp = line + 1; *cp != '\0'; cp++) {
if (*cp != '#')
continue;
if (*(cp - 1) == '\\') {
strcpy(cp - 1, cp);
cp--;
continue;
}
*cp = '\0';
break;
}
q = parse = missing_field(sob(line), errline);
parse = son(line);
if (!*parse)
errx(1, "malformed line (missing fields):\n%s",
errline);
*parse = '\0';
special = 0;
working = init_entry(q, NULL);
if (strcasecmp(DEFAULT_MARKER, q) == 0) {
special = 1;
if (defconf_p == NULL) {
warnx("Ignoring entry for %s in %s!", q,
cfname);
free_entry(working);
continue;
} else if (*defconf_p != NULL) {
warnx("Ignoring duplicate entry for %s!", q);
free_entry(working);
continue;
}
*defconf_p = working;
}
q = parse = missing_field(sob(++parse), errline);
parse = son(parse);
if (!*parse)
errx(1, "malformed line (missing fields):\n%s",
errline);
*parse = '\0';
if ((group = strchr(q, ':')) != NULL ||
(group = strrchr(q, '.')) != NULL) {
*group++ = '\0';
if (*q) {
if (!(isnumberstr(q))) {
if ((pwd = getpwnam(q)) == NULL)
errx(1,
"error in config file; unknown user:\n%s",
errline);
working->uid = pwd->pw_uid;
} else
working->uid = atoi(q);
} else
working->uid = (uid_t)-1;
q = group;
if (*q) {
if (!(isnumberstr(q))) {
if ((grp = getgrnam(q)) == NULL)
errx(1,
"error in config file; unknown group:\n%s",
errline);
working->gid = grp->gr_gid;
} else
working->gid = atoi(q);
} else
working->gid = (gid_t)-1;
q = parse = missing_field(sob(++parse), errline);
parse = son(parse);
if (!*parse)
errx(1, "malformed line (missing fields):\n%s",
errline);
*parse = '\0';
} else {
working->uid = (uid_t)-1;
working->gid = (gid_t)-1;
}
if (!sscanf(q, "%o", &working->permissions))
errx(1, "error in config file; bad permissions:\n%s",
errline);
q = parse = missing_field(sob(++parse), errline);
parse = son(parse);
if (!*parse)
errx(1, "malformed line (missing fields):\n%s",
errline);
*parse = '\0';
if (!sscanf(q, "%d", &working->numlogs) || working->numlogs < 0)
errx(1, "error in config file; bad value for count of logs to save:\n%s",
errline);
q = parse = missing_field(sob(++parse), errline);
parse = son(parse);
if (!*parse)
errx(1, "malformed line (missing fields):\n%s",
errline);
*parse = '\0';
if (isdigitch(*q))
working->size = atoi(q);
else if (strcmp(q,"*") == 0)
working->size = -1;
else {
warnx("Invalid value of '%s' for 'size' in line:\n%s",
q, errline);
working->size = -1;
}
working->flags = 0;
q = parse = missing_field(sob(++parse), errline);
parse = son(parse);
eol = !*parse;
*parse = '\0';
{
char *ep;
u_long ul;
ul = strtoul(q, &ep, 10);
if (ep == q)
working->hours = 0;
else if (*ep == '*')
working->hours = -1;
else if (ul > INT_MAX)
errx(1, "interval is too large:\n%s", errline);
else
working->hours = ul;
if (*ep == '\0' || strcmp(ep, "*") == 0)
goto no_trimat;
if (*ep != '@' && *ep != '$')
errx(1, "malformed interval/at:\n%s", errline);
working->flags |= CE_TRIMAT;
working->trim_at = ptime_init(NULL);
ptm_opts = PTM_PARSE_ISO8601;
if (*ep == '$')
ptm_opts = PTM_PARSE_DWM;
ptm_opts |= PTM_PARSE_MATCHDOM;
res = ptime_relparse(working->trim_at, ptm_opts,
ptimeget_secs(timenow), ep + 1);
if (res == -2)
errx(1, "nonexistent time for 'at' value:\n%s",
errline);
else if (res < 0)
errx(1, "malformed 'at' value:\n%s", errline);
}
no_trimat:
if (eol)
q = NULL;
else {
q = parse = sob(++parse); /* Optional field */
parse = son(parse);
if (!*parse)
eol = 1;
*parse = '\0';
}
for (; q && *q && !isspacech(*q); q++) {
switch (tolowerch(*q)) {
case 'b':
working->flags |= CE_BINARY;
break;
case 'c':
/*
* XXX - Ick! Ugly! Remove ASAP!
* We want `c' and `C' for "create". But we
* will temporarily treat `c' as `g', because
* FreeBSD releases <= 4.8 have a typo of
* checking ('G' || 'c') for CE_GLOB.
*/
if (*q == 'c') {
warnx("Assuming 'g' for 'c' in flags for line:\n%s",
errline);
warnx("The 'c' flag will eventually mean 'CREATE'");
working->flags |= CE_GLOB;
break;
}
working->flags |= CE_CREATE;
break;
case 'g':
working->flags |= CE_GLOB;
break;
case 'j':
working->flags |= CE_BZCOMPACT;
break;
case 'n':
working->flags |= CE_NOSIGNAL;
break;
case 'u':
working->flags |= CE_SIGNALGROUP;
break;
case 'w':
working->flags |= CE_COMPACTWAIT;
break;
case 'z':
working->flags |= CE_COMPACT;
break;
case '-':
break;
case 'f': /* Used by OpenBSD for "CE_FOLLOW" */
case 'm': /* Used by OpenBSD for "CE_MONITOR" */
case 'p': /* Used by NetBSD for "CE_PLAIN0" */
default:
errx(1, "illegal flag in config file -- %c",
*q);
}
}
if (eol)
q = NULL;
else {
q = parse = sob(++parse); /* Optional field */
parse = son(parse);
if (!*parse)
eol = 1;
*parse = '\0';
}
working->pid_file = NULL;
if (q && *q) {
if (*q == '/')
working->pid_file = strdup(q);
else if (isdigit(*q))
goto got_sig;
else
errx(1,
"illegal pid file or signal number in config file:\n%s",
errline);
}
if (eol)
q = NULL;
else {
q = parse = sob(++parse); /* Optional field */
*(parse = son(parse)) = '\0';
}
working->sig = SIGHUP;
if (q && *q) {
if (isdigit(*q)) {
got_sig:
working->sig = atoi(q);
} else {
err_sig:
errx(1,
"illegal signal number in config file:\n%s",
errline);
}
if (working->sig < 1 || working->sig >= NSIG)
goto err_sig;
}
/*
* Finish figuring out what pid-file to use (if any) in
* later processing if this logfile needs to be rotated.
*/
if ((working->flags & CE_NOSIGNAL) == CE_NOSIGNAL) {
/*
* This config-entry specified 'n' for nosignal,
* see if it also specified an explicit pid_file.
* This would be a pretty pointless combination.
*/
if (working->pid_file != NULL) {
warnx("Ignoring '%s' because flag 'n' was specified in line:\n%s",
working->pid_file, errline);
free(working->pid_file);
working->pid_file = NULL;
}
} else if (working->pid_file == NULL) {
/*
* This entry did not specify the 'n' flag, which
* means it should signal syslogd unless it had
* specified some other pid-file (and obviously the
* syslog pid-file will not be for a process-group).
* Also, we should only try to notify syslog if we
* are root.
*/
if (working->flags & CE_SIGNALGROUP) {
warnx("Ignoring flag 'U' in line:\n%s",
errline);
working->flags &= ~CE_SIGNALGROUP;
}
if (needroot)
working->pid_file = strdup(_PATH_SYSLOGPID);
}
/*
* Add this entry to the appropriate list of entries, unless
* it was some kind of special entry (eg: <default>).
*/
if (special) {
; /* Do not add to any list */
} else if (working->flags & CE_GLOB) {
if (!*glob_p)
*glob_p = working;
else
lastglob->next = working;
lastglob = working;
} else {
if (!*work_p)
*work_p = working;
else
lastwork->next = working;
lastwork = working;
}
free(errline);
errline = NULL;
}
}
static char *
missing_field(char *p, char *errline)
{
if (!p || !*p)
errx(1, "missing field in config file:\n%s", errline);
return (p);
}
static void
dotrim(const struct conf_entry *ent)
{
char dirpart[MAXPATHLEN], namepart[MAXPATHLEN];
char file1[MAXPATHLEN], file2[MAXPATHLEN];
char zfile1[MAXPATHLEN], zfile2[MAXPATHLEN];
char jfile1[MAXPATHLEN];
char tfile[MAXPATHLEN];
int flags, notified, need_notification, fd, numlogs_c;
struct stat st;
flags = ent->flags;
if (archtodir) {
char *p;
/* build complete name of archive directory into dirpart */
if (*archdirname == '/') { /* absolute */
strlcpy(dirpart, archdirname, sizeof(dirpart));
} else { /* relative */
/* get directory part of logfile */
strlcpy(dirpart, ent->log, sizeof(dirpart));
if ((p = rindex(dirpart, '/')) == NULL)
dirpart[0] = '\0';
else
*(p + 1) = '\0';
strlcat(dirpart, archdirname, sizeof(dirpart));
}
/* check if archive directory exists, if not, create it */
if (lstat(dirpart, &st))
createdir(ent, dirpart);
/* get filename part of logfile */
if ((p = rindex(ent->log, '/')) == NULL)
strlcpy(namepart, ent->log, sizeof(namepart));
else
strlcpy(namepart, p + 1, sizeof(namepart));
/* name of oldest log */
(void) snprintf(file1, sizeof(file1), "%s/%s.%d", dirpart,
namepart, ent->numlogs);
(void) snprintf(zfile1, sizeof(zfile1), "%s%s", file1,
COMPRESS_POSTFIX);
snprintf(jfile1, sizeof(jfile1), "%s%s", file1,
BZCOMPRESS_POSTFIX);
} else {
/* name of oldest log */
(void) snprintf(file1, sizeof(file1), "%s.%d", ent->log,
ent->numlogs);
(void) snprintf(zfile1, sizeof(zfile1), "%s%s", file1,
COMPRESS_POSTFIX);
snprintf(jfile1, sizeof(jfile1), "%s%s", file1,
BZCOMPRESS_POSTFIX);
}
if (noaction) {
printf("\trm -f %s\n", file1);
printf("\trm -f %s\n", zfile1);
printf("\trm -f %s\n", jfile1);
} else {
(void) unlink(file1);
(void) unlink(zfile1);
(void) unlink(jfile1);
}
/* Move down log files */
numlogs_c = ent->numlogs; /* copy for countdown */
while (numlogs_c--) {
(void) strlcpy(file2, file1, sizeof(file2));
if (archtodir)
(void) snprintf(file1, sizeof(file1), "%s/%s.%d",
dirpart, namepart, numlogs_c);
else
(void) snprintf(file1, sizeof(file1), "%s.%d",
ent->log, numlogs_c);
(void) strlcpy(zfile1, file1, sizeof(zfile1));
(void) strlcpy(zfile2, file2, sizeof(zfile2));
if (lstat(file1, &st)) {
(void) strlcat(zfile1, COMPRESS_POSTFIX,
sizeof(zfile1));
(void) strlcat(zfile2, COMPRESS_POSTFIX,
sizeof(zfile2));
if (lstat(zfile1, &st)) {
strlcpy(zfile1, file1, sizeof(zfile1));
strlcpy(zfile2, file2, sizeof(zfile2));
strlcat(zfile1, BZCOMPRESS_POSTFIX,
sizeof(zfile1));
strlcat(zfile2, BZCOMPRESS_POSTFIX,
sizeof(zfile2));
if (lstat(zfile1, &st))
continue;
}
}
if (noaction) {
printf("\tmv %s %s\n", zfile1, zfile2);
printf("\tchmod %o %s\n", ent->permissions, zfile2);
if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1)
printf("\tchown %u:%u %s\n",
ent->uid, ent->gid, zfile2);
} else {
(void) rename(zfile1, zfile2);
if (chmod(zfile2, ent->permissions))
warn("can't chmod %s", file2);
if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1)
if (chown(zfile2, ent->uid, ent->gid))
warn("can't chown %s", zfile2);
}
}
if (!noaction && !(flags & CE_BINARY)) {
/* Report the trimming to the old log */
(void) log_trim(ent->log, ent);
}
if (ent->numlogs == 0) {
if (noaction)
printf("\trm %s\n", ent->log);
else
(void) unlink(ent->log);
} else {
if (noaction)
printf("\tmv %s to %s\n", ent->log, file1);
else {
if (archtodir)
movefile(ent->log, file1, ent->permissions,
ent->uid, ent->gid);
else
(void) rename(ent->log, file1);
}
}
/* Now move the new log file into place */
/* XXX - We should replace the above 'rename' with
* 'link(ent->log, file1)' and then replace
* the following with 'createfile(ent)' */
strlcpy(tfile, ent->log, sizeof(tfile));
strlcat(tfile, ".XXXXXX", sizeof(tfile));
if (noaction) {
printf("Start new log...\n");
printf("\tmktemp %s\n", tfile);
} else {
mkstemp(tfile);
fd = creat(tfile, ent->permissions);
if (fd < 0)
err(1, "can't start new log");
if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1)
if (fchown(fd, ent->uid, ent->gid))
err(1, "can't chown new log file");
(void) close(fd);
if (!(flags & CE_BINARY)) {
/* Add status message to new log file */
if (log_trim(tfile, ent))
err(1, "can't add status message to log");
}
}
if (noaction) {
printf("\tchmod %o %s\n", ent->permissions, tfile);
printf("\tmv %s %s\n", tfile, ent->log);
} else {
(void) chmod(tfile, ent->permissions);
if (rename(tfile, ent->log) < 0) {
err(1, "can't start new log");
(void) unlink(tfile);
}
}
/*
* Find out if there is a process to signal. If nosignal (-s) was
* specified, then do not signal any process. Note that nosignal
* will trigger a warning message if the rotated logfile needs to
* be compressed, *unless* -R was specified. This is because there
* presumably still are process(es) writing to the old logfile, but
* we assume that a -sR request comes from a process which writes
* to the logfile, and as such, that process has already made sure
* that the logfile is not presently in use.
*/
need_notification = notified = 0;
if (ent->pid_file != NULL) {
need_notification = 1;
if (!nosignal)
notified = send_signal(ent); /* the normal case! */
else if (rotatereq)
need_notification = 0;
}
if ((flags & CE_COMPACT) || (flags & CE_BZCOMPACT)) {
if (need_notification && !notified)
warnx(
"log %s.0 not compressed because daemon(s) not notified",
ent->log);
else if (noaction)
if (flags & CE_COMPACT)
printf("\tgzip %s.0\n", ent->log);
else
printf("\tbzip2 %s.0\n", ent->log);
else {
if (notified) {
if (verbose)
printf("small pause to allow daemon(s) to close log\n");
sleep(10);
}
if (archtodir) {
(void) snprintf(file1, sizeof(file1), "%s/%s",
dirpart, namepart);
if (flags & CE_COMPACT)
compress_log(file1,
flags & CE_COMPACTWAIT);
else if (flags & CE_BZCOMPACT)
bzcompress_log(file1,
flags & CE_COMPACTWAIT);
} else {
if (flags & CE_COMPACT)
compress_log(ent->log,
flags & CE_COMPACTWAIT);
else if (flags & CE_BZCOMPACT)
bzcompress_log(ent->log,
flags & CE_COMPACTWAIT);
}
}
}
}
/* Log the fact that the logs were turned over */
static int
log_trim(const char *logname, const struct conf_entry *log_ent)
{
FILE *f;
const char *xtra;
if ((f = fopen(logname, "a")) == NULL)
return (-1);
xtra = "";
if (log_ent->def_cfg)
xtra = " using <default> rule";
if (log_ent->firstcreate)
fprintf(f, "%s %s newsyslog[%d]: logfile first created%s\n",
daytime, hostname, (int) getpid(), xtra);
else if (log_ent->r_reason != NULL)
fprintf(f, "%s %s newsyslog[%d]: logfile turned over%s%s\n",
daytime, hostname, (int) getpid(), log_ent->r_reason, xtra);
else
fprintf(f, "%s %s newsyslog[%d]: logfile turned over%s\n",
daytime, hostname, (int) getpid(), xtra);
if (fclose(f) == EOF)
err(1, "log_trim: fclose");
return (0);
}
/* Fork of gzip to compress the old log file */
static void
compress_log(char *logname, int dowait)
{
pid_t pid;
char tmp[MAXPATHLEN];
while (dowait && (wait(NULL) > 0 || errno == EINTR))
;
(void) snprintf(tmp, sizeof(tmp), "%s.0", logname);
pid = fork();
if (pid < 0)
err(1, "gzip fork");
else if (!pid) {
(void) execl(_PATH_GZIP, _PATH_GZIP, "-f", tmp, (char *)0);
err(1, _PATH_GZIP);
}
}
/* Fork of bzip2 to compress the old log file */
static void
bzcompress_log(char *logname, int dowait)
{
pid_t pid;
char tmp[MAXPATHLEN];
while (dowait && (wait(NULL) > 0 || errno == EINTR))
;
snprintf(tmp, sizeof(tmp), "%s.0", logname);
pid = fork();
if (pid < 0)
err(1, "bzip2 fork");
else if (!pid) {
execl(_PATH_BZIP2, _PATH_BZIP2, "-f", tmp, (char *)0);
err(1, _PATH_BZIP2);
}
}
/* Return size in kilobytes of a file */
static int
sizefile(char *file)
{
struct stat sb;
if (stat(file, &sb) < 0)
return (-1);
return (kbytes(dbtob(sb.st_blocks)));
}
/* Return the age of old log file (file.0) */
static int
age_old_log(char *file)
{
struct stat sb;
char *endp;
char tmp[MAXPATHLEN + sizeof(".0") + sizeof(COMPRESS_POSTFIX) +
sizeof(BZCOMPRESS_POSTFIX) + 1];
if (archtodir) {
char *p;
/* build name of archive directory into tmp */
if (*archdirname == '/') { /* absolute */
strlcpy(tmp, archdirname, sizeof(tmp));
} else { /* relative */
/* get directory part of logfile */
strlcpy(tmp, file, sizeof(tmp));
if ((p = rindex(tmp, '/')) == NULL)
tmp[0] = '\0';
else
*(p + 1) = '\0';
strlcat(tmp, archdirname, sizeof(tmp));
}
strlcat(tmp, "/", sizeof(tmp));
/* get filename part of logfile */
if ((p = rindex(file, '/')) == NULL)
strlcat(tmp, file, sizeof(tmp));
else
strlcat(tmp, p + 1, sizeof(tmp));
} else {
(void) strlcpy(tmp, file, sizeof(tmp));
}
strlcat(tmp, ".0", sizeof(tmp));
if (stat(tmp, &sb) < 0) {
/*
* A plain '.0' file does not exist. Try again, first
* with the added suffix of '.gz', then with an added
* suffix of '.bz2' instead of '.gz'.
*/
endp = strchr(tmp, '\0');
strlcat(tmp, COMPRESS_POSTFIX, sizeof(tmp));
if (stat(tmp, &sb) < 0) {
*endp = '\0'; /* Remove .gz */
strlcat(tmp, BZCOMPRESS_POSTFIX, sizeof(tmp));
if (stat(tmp, &sb) < 0)
return (-1);
}
}
return ((int)(ptimeget_secs(timenow) - sb.st_mtime + 1800) / 3600);
}
/* Skip Over Blanks */
static char *
sob(char *p)
{
while (p && *p && isspace(*p))
p++;
return (p);
}
/* Skip Over Non-Blanks */
static char *
son(char *p)
{
while (p && *p && !isspace(*p))
p++;
return (p);
}
/* Check if string is actually a number */
static int
isnumberstr(const char *string)
{
while (*string) {
if (!isdigitch(*string++))
return (0);
}
return (1);
}
/* physically move file */
static void
movefile(char *from, char *to, int perm, uid_t owner_uid, gid_t group_gid)
{
FILE *src, *dst;
int c;
if ((src = fopen(from, "r")) == NULL)
err(1, "can't fopen %s for reading", from);
if ((dst = fopen(to, "w")) == NULL)
err(1, "can't fopen %s for writing", to);
if (owner_uid != (uid_t)-1 || group_gid != (gid_t)-1) {
if (fchown(fileno(dst), owner_uid, group_gid))
err(1, "can't fchown %s", to);
}
if (fchmod(fileno(dst), perm))
err(1, "can't fchmod %s", to);
while ((c = getc(src)) != EOF) {
if ((putc(c, dst)) == EOF)
err(1, "error writing to %s", to);
}
if (ferror(src))
err(1, "error reading from %s", from);
if ((fclose(src)) != 0)
err(1, "can't fclose %s", to);
if ((fclose(dst)) != 0)
err(1, "can't fclose %s", from);
if ((unlink(from)) != 0)
err(1, "can't unlink %s", from);
}
/* create one or more directory components of a path */
static void
createdir(const struct conf_entry *ent, char *dirpart)
{
int res;
char *s, *d;
char mkdirpath[MAXPATHLEN];
struct stat st;
s = dirpart;
d = mkdirpath;
for (;;) {
*d++ = *s++;
if (*s != '/' && *s != '\0')
continue;
*d = '\0';
res = lstat(mkdirpath, &st);
if (res != 0) {
if (noaction) {
printf("\tmkdir %s\n", mkdirpath);
} else {
res = mkdir(mkdirpath, 0755);
if (res != 0)
err(1, "Error on mkdir(\"%s\") for -a",
mkdirpath);
}
}
if (*s == '\0')
break;
}
if (verbose) {
if (ent->firstcreate)
printf("Created directory '%s' for new %s\n",
dirpart, ent->log);
else
printf("Created directory '%s' for -a\n", dirpart);
}
}
/*
* Create a new log file, destroying any currently-existing version
* of the log file in the process. If the caller wants a backup copy
* of the file to exist, they should call 'link(logfile,logbackup)'
* before calling this routine.
*/
void
createlog(const struct conf_entry *ent)
{
int fd, failed;
struct stat st;
char *realfile, *slash, tempfile[MAXPATHLEN];
fd = -1;
realfile = ent->log;
/*
* If this log file is being created for the first time (-C option),
* then it may also be true that the parent directory does not exist
* yet. Check, and create that directory if it is missing.
*/
if (ent->firstcreate) {
strlcpy(tempfile, realfile, sizeof(tempfile));
slash = strrchr(tempfile, '/');
if (slash != NULL) {
*slash = '\0';
failed = lstat(tempfile, &st);
if (failed && errno != ENOENT)
err(1, "Error on lstat(%s)", tempfile);
if (failed)
createdir(ent, tempfile);
else if (!S_ISDIR(st.st_mode))
errx(1, "%s exists but is not a directory",
tempfile);
}
}
/*
* First create an unused filename, so it can be chown'ed and
* chmod'ed before it is moved into the real location. mkstemp
* will create the file mode=600 & owned by us. Note that all
* temp files will have a suffix of '.z<something>'.
*/
strlcpy(tempfile, realfile, sizeof(tempfile));
strlcat(tempfile, ".zXXXXXX", sizeof(tempfile));
if (noaction)
printf("\tmktemp %s\n", tempfile);
else {
fd = mkstemp(tempfile);
if (fd < 0)
err(1, "can't mkstemp logfile %s", tempfile);
/*
* Add status message to what will become the new log file.
*/
if (!(ent->flags & CE_BINARY)) {
if (log_trim(tempfile, ent))
err(1, "can't add status message to log");
}
}
/* Change the owner/group, if we are supposed to */
if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1) {
if (noaction)
printf("\tchown %u:%u %s\n", ent->uid, ent->gid,
tempfile);
else {
failed = fchown(fd, ent->uid, ent->gid);
if (failed)
err(1, "can't fchown temp file %s", tempfile);
}
}
/*
* Note that if the real logfile still exists, and if the call
* to rename() fails, then "neither the old file nor the new
* file shall be changed or created" (to quote the standard).
* If the call succeeds, then the file will be replaced without
* any window where some other process might find that the file
* did not exist.
* XXX - ? It may be that for some error conditions, we could
* retry by first removing the realfile and then renaming.
*/
if (noaction) {
printf("\tchmod %o %s\n", ent->permissions, tempfile);
printf("\tmv %s %s\n", tempfile, realfile);
} else {
failed = fchmod(fd, ent->permissions);
if (failed)
err(1, "can't fchmod temp file '%s'", tempfile);
failed = rename(tempfile, realfile);
if (failed)
err(1, "can't mv %s to %s", tempfile, realfile);
}
if (fd >= 0)
close(fd);
}
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