File: [local] / src / usr.bin / newsyslog / newsyslog.c (download)
Revision 1.93, Fri Jan 16 06:40:10 2015 UTC (9 years, 4 months ago) by deraadt
Branch: MAIN
Changes since 1.92: +12 -12 lines
Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible. Annotate <sys/param.h> lines with their current reasons. Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc. Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution. These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)
|
/* $OpenBSD: newsyslog.c,v 1.93 2015/01/16 06:40:10 deraadt Exp $ */
/*
* Copyright (c) 1999, 2002, 2003 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
/*
* Copyright (c) 1997, Jason Downs. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* 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 specified number of backup files around.
*
*/
#ifndef CONF
#define CONF "/etc/newsyslog.conf" /* Configuration file */
#endif
#ifndef PIDFILE
#define PIDFILE "/etc/syslog.pid"
#endif
#ifndef COMPRESS
#define COMPRESS "/usr/bin/compress" /* File compression program */
#endif
#ifndef COMPRESS_POSTFIX
#define COMPRESS_POSTFIX ".Z"
#endif
#ifndef STATS_DIR
#define STATS_DIR "/etc"
#endif
#ifndef SENDMAIL
#define SENDMAIL "/usr/lib/sendmail"
#endif
#include <sys/param.h> /* DEV_BSIZE */
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <limits.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#define CE_ROTATED 0x01 /* Log file has been rotated */
#define CE_COMPACT 0x02 /* Compact the archived log files */
#define CE_BINARY 0x04 /* Logfile is in binary, don't add */
/* status messages */
#define CE_MONITOR 0x08 /* Monitor for changes */
#define CE_FOLLOW 0x10 /* Follow symbolic links */
#define CE_TRIMAT 0x20 /* Trim at a specific time */
#define MIN_PID 4 /* Don't touch pids lower than this */
#define MIN_SIZE 256 /* Don't rotate if smaller (in bytes) */
#define DPRINTF(x) do { if (verbose) printf x ; } while (0)
struct conf_entry {
char *log; /* Name of the log */
char *logbase; /* Basename of the log */
char *backdir; /* Directory in which to store backups */
uid_t uid; /* Owner of log */
gid_t gid; /* Group of log */
int numlogs; /* Number of logs to keep */
off_t size; /* Size cutoff to trigger trimming the log */
int hours; /* Hours between log trimming */
time_t trim_at; /* Specific time at which to do trimming */
mode_t permissions; /* File permissions on the log */
int signal; /* Signal to send (defaults to SIGHUP) */
int flags; /* Flags (CE_COMPACT & CE_BINARY) */
char *whom; /* Whom to notify if logfile changes */
char *pidfile; /* Path to file containing pid to signal */
char *runcmd; /* Command to run instead of sending a signal */
struct conf_entry *next; /* Linked list pointer */
};
struct pidinfo {
char *file;
int signal;
};
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 monitormode = 0; /* Don't do monitoring by default */
int force = 0; /* Force the logs to be rotated */
char *conf = CONF; /* Configuration file to use */
time_t timenow;
char hostname[HOST_NAME_MAX+1]; /* Hostname */
char *daytime; /* timenow in human readable form */
char *arcdir; /* Dir to put archives in (if it exists) */
FILE *openmail(void);
char *lstat_log(char *, size_t, int);
char *missing_field(char *, char *, int);
char *sob(char *);
char *son(char *);
int age_old_log(struct conf_entry *);
int domonitor(struct conf_entry *);
int isnumberstr(char *);
int log_trim(char *);
int movefile(char *, char *, uid_t, gid_t, mode_t);
int stat_suffix(char *, size_t, char *, struct stat *,
int (*)(const char *, struct stat *));
off_t sizefile(struct stat *);
struct conf_entry *
parse_file(int *);
time_t parse8601(char *);
time_t parseDWM(char *);
void child_killer(int);
void compress_log(struct conf_entry *);
void do_entry(struct conf_entry *);
void dotrim(struct conf_entry *);
void rotate(struct conf_entry *, const char *);
void parse_args(int, char **);
void run_command(char *);
void send_signal(char *, int);
void usage(void);
int
main(int argc, char **argv)
{
struct conf_entry *p, *q, *x, *y;
struct pidinfo *pidlist, *pl;
int status, listlen;
char **av;
parse_args(argc, argv);
argc -= optind;
argv += optind;
if (needroot && getuid() && geteuid())
errx(1, "You must be root.");
p = parse_file(&listlen);
if (argc > 0) {
/* Only rotate specified files. */
x = y = NULL;
listlen = 0;
for (av = argv; *av; av++) {
for (q = p; q; q = q->next)
if (strcmp(*av, q->log) == 0) {
if (x == NULL)
x = y = q;
else {
y->next = q;
y = q;
}
listlen++;
break;
}
if (q == NULL)
warnx("%s: %s not found", conf, *av);
}
if (x == NULL)
errx(1, "%s: no specified log files", conf);
y->next = NULL;
p = x;
}
pidlist = (struct pidinfo *)calloc(listlen + 1, sizeof(struct pidinfo));
if (pidlist == NULL)
err(1, "calloc");
signal(SIGCHLD, child_killer);
/* Step 1, rotate all log files */
for (q = p; q; q = q->next)
do_entry(q);
/* Step 2, make a list of unique pid files */
for (q = p, pl = pidlist; q; ) {
if (q->flags & CE_ROTATED) {
struct pidinfo *pltmp;
for (pltmp = pidlist; pltmp < pl; pltmp++) {
if ((q->pidfile && pltmp->file &&
strcmp(pltmp->file, q->pidfile) == 0 &&
pltmp->signal == q->signal) ||
(q->runcmd && pltmp->file &&
strcmp(q->runcmd, pltmp->file) == 0))
break;
}
if (pltmp == pl) { /* unique entry */
if (q->runcmd) {
pl->file = q->runcmd;
pl->signal = -1;
} else {
pl->file = q->pidfile;
pl->signal = q->signal;
}
pl++;
}
}
q = q->next;
}
/* Step 3, send a signal or run a command */
for (pl--; pl >= pidlist; pl--) {
if (pl->file != NULL) {
if (pl->signal == -1)
run_command(pl->file);
else
send_signal(pl->file, pl->signal);
}
}
if (!noaction)
sleep(5);
/* Step 4, compress the log.0 file if configured to do so and free */
while (p) {
if ((p->flags & CE_COMPACT) && (p->flags & CE_ROTATED) &&
p->numlogs > 0)
compress_log(p);
q = p;
p = p->next;
free(q);
}
/* Wait for children to finish, then exit */
while (waitpid(-1, &status, 0) != -1)
;
exit(0);
}
void
do_entry(struct conf_entry *ent)
{
struct stat sb;
int modhours;
off_t size;
if (lstat(ent->log, &sb) != 0)
return;
if (!S_ISREG(sb.st_mode) &&
(!S_ISLNK(sb.st_mode) || !(ent->flags & CE_FOLLOW))) {
DPRINTF(("--> not a regular file, skipping\n"));
return;
}
if (S_ISLNK(sb.st_mode) && stat(ent->log, &sb) != 0) {
DPRINTF(("--> link target does not exist, skipping\n"));
return;
}
if (ent->uid == (uid_t)-1)
ent->uid = sb.st_uid;
if (ent->gid == (gid_t)-1)
ent->gid = sb.st_gid;
DPRINTF(("%s <%d%s%s%s%s>: ", ent->log, ent->numlogs,
(ent->flags & CE_COMPACT) ? "Z" : "",
(ent->flags & CE_BINARY) ? "B" : "",
(ent->flags & CE_FOLLOW) ? "F" : "",
(ent->flags & CE_MONITOR) && monitormode ? "M" : ""));
size = sizefile(&sb);
modhours = age_old_log(ent);
if (ent->flags & CE_TRIMAT && !force) {
if (timenow < ent->trim_at ||
difftime(timenow, ent->trim_at) >= 60 * 60) {
DPRINTF(("--> will trim at %s",
ctime(&ent->trim_at)));
return;
} else if (ent->hours <= 0) {
DPRINTF(("--> time is up\n"));
}
}
if (ent->size > 0)
DPRINTF(("size (KB): %.2f [%d] ", size / 1024.0,
(int)(ent->size / 1024)));
if (ent->hours > 0)
DPRINTF(("age (hr): %d [%d] ", modhours, ent->hours));
if (monitormode && (ent->flags & CE_MONITOR) && domonitor(ent))
DPRINTF(("--> monitored\n"));
else if (!monitormode &&
(force || (ent->size > 0 && size >= ent->size) ||
(ent->hours <= 0 && (ent->flags & CE_TRIMAT)) ||
(ent->hours > 0 && (modhours >= ent->hours || modhours < 0)
&& ((ent->flags & CE_BINARY) || size >= MIN_SIZE)))) {
DPRINTF(("--> trimming log....\n"));
if (noaction && !verbose)
printf("%s <%d%s%s%s>\n", ent->log,
ent->numlogs,
(ent->flags & CE_COMPACT) ? "Z" : "",
(ent->flags & CE_BINARY) ? "B" : "",
(ent->flags & CE_FOLLOW) ? "F" : "");
dotrim(ent);
ent->flags |= CE_ROTATED;
} else
DPRINTF(("--> skipping\n"));
}
/* Run the specified command */
void
run_command(char *cmd)
{
if (noaction)
(void)printf("run %s\n", cmd);
else
system(cmd);
}
/* Send a signal to the pid specified by pidfile */
void
send_signal(char *pidfile, int signal)
{
char line[BUFSIZ], *ep, *err;
pid_t pid;
long lval;
FILE *f;
if ((f = fopen(pidfile, "r")) == NULL) {
warn("can't open %s", pidfile);
return;
}
pid = 0;
errno = 0;
err = NULL;
if (fgets(line, sizeof(line), f)) {
lval = strtol(line, &ep, 10);
if (line[0] == '\0' || (*ep != '\0' && *ep != '\n'))
err = "invalid number in";
else if (lval < 0 || (errno == ERANGE && lval == LONG_MAX))
err = "out of range number in";
else if (lval == 0)
err = "no number in";
else if (lval < MIN_PID)
err = "preposterous process number in";
else
pid = (pid_t)lval;
} else {
if (errno == 0)
err = "empty";
else
err = "error reading";
}
(void)fclose(f);
if (err)
warnx("%s pid file: %s", err, pidfile);
else if (noaction)
(void)printf("kill -%s %ld\n", sys_signame[signal], (long)pid);
else if (kill(pid, signal))
warnx("warning - could not send SIG%s to PID from pid file %s",
sys_signame[signal], pidfile);
}
void
parse_args(int argc, char **argv)
{
char *p;
int ch;
timenow = time(NULL);
daytime = ctime(&timenow) + 4;
daytime[15] = '\0';
/* Let's get our hostname */
(void)gethostname(hostname, sizeof(hostname));
/* Truncate domain */
if ((p = strchr(hostname, '.')) != NULL)
*p = '\0';
while ((ch = getopt(argc, argv, "Fmnrva:f:")) != -1) {
switch (ch) {
case 'a':
arcdir = optarg;
break;
case 'n':
noaction++; /* This implies needroot as off */
/* fall through */
case 'r':
needroot = 0;
break;
case 'v':
verbose++;
break;
case 'f':
conf = optarg;
break;
case 'm':
monitormode++;
break;
case 'F':
force++;
break;
default:
usage();
}
}
if (monitormode && force)
errx(1, "cannot specify both -m and -F flags");
}
void
usage(void)
{
extern const char *__progname;
(void)fprintf(stderr, "usage: %s [-Fmnrv] [-a directory] "
"[-f config_file] [log ...]\n", __progname);
exit(1);
}
/*
* Parse a configuration file and return a linked list of all the logs
* to process
*/
struct conf_entry *
parse_file(int *nentries)
{
char line[BUFSIZ], *parse, *q, *errline, *group, *tmp, *ep;
struct conf_entry *working = NULL, *first = NULL;
struct passwd *pwd;
struct group *grp;
struct stat sb;
int lineno;
FILE *f;
long l;
if (strcmp(conf, "-") == 0)
f = stdin;
else if ((f = fopen(conf, "r")) == NULL)
err(1, "can't open %s", conf);
*nentries = 0;
for (lineno = 1; fgets(line, sizeof(line), f); lineno++) {
tmp = sob(line);
if (*tmp == '\0' || *tmp == '#')
continue;
errline = strdup(tmp);
if (errline == NULL)
err(1, "strdup");
(*nentries)++;
if (!first) {
working = malloc(sizeof(struct conf_entry));
if (working == NULL)
err(1, "malloc");
first = working;
} else {
working->next = malloc(sizeof(struct conf_entry));
if (working->next == NULL)
err(1, "malloc");
working = working->next;
}
q = parse = missing_field(sob(line), errline, lineno);
*(parse = son(line)) = '\0';
working->log = strdup(q);
if (working->log == NULL)
err(1, "strdup");
if ((working->logbase = strrchr(working->log, '/')) != NULL)
working->logbase++;
q = parse = missing_field(sob(++parse), errline, lineno);
*(parse = son(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, "%s:%d: unknown user: %s",
conf, lineno, q);
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, "%s:%d: unknown group: %s",
conf, lineno, q);
working->gid = grp->gr_gid;
} else
working->gid = atoi(q);
} else
working->gid = (gid_t)-1;
q = parse = missing_field(sob(++parse), errline, lineno);
*(parse = son(parse)) = '\0';
} else {
working->uid = (uid_t)-1;
working->gid = (gid_t)-1;
}
l = strtol(q, &ep, 8);
if (*ep != '\0' || l < 0 || l > ALLPERMS)
errx(1, "%s:%d: bad permissions: %s", conf, lineno, q);
working->permissions = (mode_t)l;
q = parse = missing_field(sob(++parse), errline, lineno);
*(parse = son(parse)) = '\0';
l = strtol(q, &ep, 10);
if (*ep != '\0' || l < 0 || l >= INT_MAX)
errx(1, "%s:%d: bad number: %s", conf, lineno, q);
working->numlogs = (int)l;
q = parse = missing_field(sob(++parse), errline, lineno);
*(parse = son(parse)) = '\0';
if (isdigit((unsigned char)*q))
working->size = atoi(q) * 1024;
else
working->size = -1;
working->flags = 0;
q = parse = missing_field(sob(++parse), errline, lineno);
*(parse = son(parse)) = '\0';
l = strtol(q, &ep, 10);
if (l < 0 || l >= INT_MAX)
errx(1, "%s:%d: interval out of range: %s", conf,
lineno, q);
working->hours = (int)l;
switch (*ep) {
case '\0':
break;
case '@':
working->trim_at = parse8601(ep + 1);
if (working->trim_at == (time_t) - 1)
errx(1, "%s:%d: bad time: %s", conf, lineno, q);
working->flags |= CE_TRIMAT;
break;
case '$':
working->trim_at = parseDWM(ep + 1);
if (working->trim_at == (time_t) - 1)
errx(1, "%s:%d: bad time: %s", conf, lineno, q);
working->flags |= CE_TRIMAT;
break;
case '*':
if (q == ep)
break;
/* FALLTHROUGH */
default:
errx(1, "%s:%d: bad interval/at: %s", conf, lineno, q);
break;
}
q = sob(++parse); /* Optional field */
if (*q == 'Z' || *q == 'z' || *q == 'B' || *q == 'b' ||
*q == 'M' || *q == 'm') {
*(parse = son(q)) = '\0';
while (*q) {
switch (*q) {
case 'Z':
case 'z':
working->flags |= CE_COMPACT;
break;
case 'B':
case 'b':
working->flags |= CE_BINARY;
break;
case 'M':
case 'm':
working->flags |= CE_MONITOR;
break;
case 'F':
case 'f':
working->flags |= CE_FOLLOW;
break;
default:
errx(1, "%s:%d: illegal flag: `%c'",
conf, lineno, *q);
break;
}
q++;
}
} else
parse--; /* no flags so undo */
working->pidfile = PIDFILE;
working->signal = SIGHUP;
working->runcmd = NULL;
working->whom = NULL;
for (;;) {
q = parse = sob(++parse); /* Optional field */
if (q == NULL || *q == '\0')
break;
if (*q == '/') {
*(parse = son(parse)) = '\0';
if (strlen(q) >= PATH_MAX)
errx(1, "%s:%d: pathname too long: %s",
conf, lineno, q);
working->pidfile = strdup(q);
if (working->pidfile == NULL)
err(1, "strdup");
} else if (*q == '"' && (tmp = strchr(q + 1, '"'))) {
*(parse = tmp) = '\0';
if (*++q != '\0') {
working->runcmd = strdup(q);
if (working->runcmd == NULL)
err(1, "strdup");
}
working->pidfile = NULL;
working->signal = -1;
} else if (strncmp(q, "SIG", 3) == 0) {
int i;
*(parse = son(parse)) = '\0';
for (i = 1; i < NSIG; i++) {
if (!strcmp(sys_signame[i], q + 3)) {
working->signal = i;
break;
}
}
if (i == NSIG)
errx(1, "%s:%d: unknown signal: %s",
conf, lineno, q);
} else if (working->flags & CE_MONITOR) {
*(parse = son(parse)) = '\0';
working->whom = strdup(q);
if (working->whom == NULL)
err(1, "strdup");
} else
errx(1, "%s:%d: unrecognized field: %s",
conf, lineno, q);
}
free(errline);
if ((working->flags & CE_MONITOR) && working->whom == NULL)
errx(1, "%s:%d: missing monitor notification field",
conf, lineno);
/* If there is an arcdir, set working->backdir. */
if (arcdir != NULL && working->logbase != NULL) {
if (*arcdir == '/') {
/* Fully qualified arcdir */
working->backdir = arcdir;
} else {
/* arcdir is relative to log's parent dir */
*(working->logbase - 1) = '\0';
if ((asprintf(&working->backdir, "%s/%s",
working->log, arcdir)) == -1)
err(1, "malloc");
*(working->logbase - 1) = '/';
}
/* Ignore arcdir if it doesn't exist. */
if (stat(working->backdir, &sb) != 0 ||
!S_ISDIR(sb.st_mode)) {
if (working->backdir != arcdir)
free(working->backdir);
working->backdir = NULL;
}
} else
working->backdir = NULL;
/* Make sure we can't oflow PATH_MAX */
if (working->backdir != NULL) {
if (snprintf(line, sizeof(line), "%s/%s.%d%s",
working->backdir, working->logbase,
working->numlogs, COMPRESS_POSTFIX) >= PATH_MAX)
errx(1, "%s:%d: pathname too long: %s",
conf, lineno, q);
} else {
if (snprintf(line, sizeof(line), "%s.%d%s",
working->log, working->numlogs, COMPRESS_POSTFIX)
>= PATH_MAX)
errx(1, "%s:%d: pathname too long: %s",
conf, lineno, working->log);
}
}
if (working)
working->next = NULL;
(void)fclose(f);
return (first);
}
char *
missing_field(char *p, char *errline, int lineno)
{
if (p == NULL || *p == '\0') {
warnx("%s:%d: missing field", conf, lineno);
fputs(errline, stderr);
exit(1);
}
return (p);
}
void
rotate(struct conf_entry *ent, const char *oldlog)
{
char file1[PATH_MAX], file2[PATH_MAX], *suffix;
int numdays = ent->numlogs - 1;
int done = 0;
/* Remove old logs */
do {
(void)snprintf(file1, sizeof(file1), "%s.%d", oldlog, numdays);
(void)snprintf(file2, sizeof(file2), "%s.%d%s", oldlog,
numdays, COMPRESS_POSTFIX);
if (noaction) {
printf("\trm -f %s %s\n", file1, file2);
done = access(file1, 0) && access(file2, 0);
} else {
done = unlink(file1) && unlink(file2);
}
numdays++;
} while (done == 0);
/* Move down log files */
for (numdays = ent->numlogs - 2; numdays >= 0; numdays--) {
/*
* If both the compressed archive and the non-compressed archive
* exist, we decide which to rotate based on the CE_COMPACT flag
*/
(void)snprintf(file1, sizeof(file1), "%s.%d", oldlog, numdays);
suffix = lstat_log(file1, sizeof(file1), ent->flags);
if (suffix == NULL)
continue;
(void)snprintf(file2, sizeof(file2), "%s.%d%s", oldlog,
numdays + 1, suffix);
if (noaction) {
printf("\tmv %s %s\n", file1, file2);
printf("\tchmod %o %s\n", ent->permissions, file2);
printf("\tchown %u:%u %s\n", ent->uid, ent->gid, file2);
} else {
if (rename(file1, file2))
warn("can't mv %s to %s", file1, file2);
if (chmod(file2, ent->permissions))
warn("can't chmod %s", file2);
if (chown(file2, ent->uid, ent->gid))
warn("can't chown %s", file2);
}
}
}
void
dotrim(struct conf_entry *ent)
{
char file1[PATH_MAX], file2[PATH_MAX], oldlog[PATH_MAX];
int fd;
/* Is there a separate backup dir? */
if (ent->backdir != NULL)
snprintf(oldlog, sizeof(oldlog), "%s/%s", ent->backdir,
ent->logbase);
else
strlcpy(oldlog, ent->log, sizeof(oldlog));
if (ent->numlogs > 0)
rotate(ent, oldlog);
if (!noaction && !(ent->flags & CE_BINARY))
(void)log_trim(ent->log);
(void)snprintf(file2, sizeof(file2), "%s.XXXXXXXXXX", ent->log);
if (noaction) {
printf("\tmktemp %s\n", file2);
} else {
if ((fd = mkstemp(file2)) < 0)
err(1, "can't start '%s' log", file2);
if (fchmod(fd, ent->permissions))
err(1, "can't chmod '%s' log file", file2);
if (fchown(fd, ent->uid, ent->gid))
err(1, "can't chown '%s' log file", file2);
(void)close(fd);
/* Add status message */
if (!(ent->flags & CE_BINARY) && log_trim(file2))
err(1, "can't add status message to log '%s'", file2);
}
if (ent->numlogs == 0) {
if (noaction)
printf("\trm %s\n", ent->log);
else if (unlink(ent->log))
warn("can't rm %s", ent->log);
} else {
(void)snprintf(file1, sizeof(file1), "%s.0", oldlog);
if (noaction) {
printf("\tmv %s to %s\n", ent->log, file1);
printf("\tchmod %o %s\n", ent->permissions, file1);
printf("\tchown %u:%u %s\n", ent->uid, ent->gid, file1);
} else if (movefile(ent->log, file1, ent->uid, ent->gid,
ent->permissions))
warn("can't mv %s to %s", ent->log, file1);
}
/* Now move the new log file into place */
if (noaction)
printf("\tmv %s to %s\n", file2, ent->log);
else if (rename(file2, ent->log))
warn("can't mv %s to %s", file2, ent->log);
}
/* Log the fact that the logs were turned over */
int
log_trim(char *log)
{
FILE *f;
if ((f = fopen(log, "a")) == NULL)
return (-1);
(void)fprintf(f, "%s %s newsyslog[%ld]: logfile turned over\n",
daytime, hostname, (long)getpid());
if (fclose(f) == EOF)
err(1, "log_trim: fclose");
return (0);
}
/* Fork off compress or gzip to compress the old log file */
void
compress_log(struct conf_entry *ent)
{
char *base, tmp[PATH_MAX];
pid_t pid;
if (ent->backdir != NULL)
snprintf(tmp, sizeof(tmp), "%s/%s.0", ent->backdir,
ent->logbase);
else
snprintf(tmp, sizeof(tmp), "%s.0", ent->log);
if ((base = strrchr(COMPRESS, '/')) == NULL)
base = COMPRESS;
else
base++;
if (noaction) {
printf("%s %s\n", base, tmp);
return;
}
pid = fork();
if (pid < 0) {
err(1, "fork");
} else if (pid == 0) {
(void)execl(COMPRESS, base, "-f", tmp, (char *)NULL);
warn(COMPRESS);
_exit(1);
}
}
/* Return size in bytes of a file */
off_t
sizefile(struct stat *sb)
{
/* For sparse files, return the size based on number of blocks used. */
if (sb->st_size / DEV_BSIZE > sb->st_blocks)
return (sb->st_blocks * DEV_BSIZE);
else
return (sb->st_size);
}
/* Return the age (in hours) of old log file (file.0), or -1 if none */
int
age_old_log(struct conf_entry *ent)
{
char file[PATH_MAX];
struct stat sb;
if (ent->backdir != NULL)
(void)snprintf(file, sizeof(file), "%s/%s.0", ent->backdir,
ent->logbase);
else
(void)snprintf(file, sizeof(file), "%s.0", ent->log);
if (ent->flags & CE_COMPACT) {
if (stat_suffix(file, sizeof(file), COMPRESS_POSTFIX, &sb,
stat) < 0 && stat(file, &sb) < 0)
return (-1);
} else {
if (stat(file, &sb) < 0 && stat_suffix(file, sizeof(file),
COMPRESS_POSTFIX, &sb, stat) < 0)
return (-1);
}
return ((int)(timenow - sb.st_mtime + 1800) / 3600);
}
/* Skip Over Blanks */
char *
sob(char *p)
{
if (p == NULL)
return(p);
while (isspace((unsigned char)*p))
p++;
return (p);
}
/* Skip Over Non-Blanks */
char *
son(char *p)
{
while (p && *p && !isspace((unsigned char)*p))
p++;
return (p);
}
/* Check if string is actually a number */
int
isnumberstr(char *string)
{
while (*string) {
if (!isdigit((unsigned char)*string++))
return (0);
}
return (1);
}
int
domonitor(struct conf_entry *ent)
{
char fname[PATH_MAX], *flog, *p, *rb = NULL;
struct stat sb, tsb;
off_t osize;
FILE *fp;
int rd;
if (stat(ent->log, &sb) < 0)
return (0);
if (noaction) {
if (!verbose)
printf("%s: monitored\n", ent->log);
return (1);
}
flog = strdup(ent->log);
if (flog == NULL)
err(1, "strdup");
for (p = flog; *p != '\0'; p++) {
if (*p == '/')
*p = '_';
}
snprintf(fname, sizeof(fname), "%s/newsyslog.%s.size",
STATS_DIR, flog);
/* ..if it doesn't exist, simply record the current size. */
if ((sb.st_size == 0) || stat(fname, &tsb) < 0)
goto update;
fp = fopen(fname, "r");
if (fp == NULL) {
warn("%s", fname);
goto cleanup;
}
#ifdef QUAD_OFF_T
if (fscanf(fp, "%lld\n", &osize) != 1) {
#else
if (fscanf(fp, "%ld\n", &osize) != 1) {
#endif /* QUAD_OFF_T */
fclose(fp);
goto update;
}
fclose(fp);
/* If the file is smaller, mark the entire thing as changed. */
if (sb.st_size < osize)
osize = 0;
/* Now see if current size is larger. */
if (sb.st_size > osize) {
rb = (char *) malloc(sb.st_size - osize);
if (rb == NULL)
err(1, "malloc");
/* Open logfile, seek. */
fp = fopen(ent->log, "r");
if (fp == NULL) {
warn("%s", ent->log);
goto cleanup;
}
fseek(fp, osize, SEEK_SET);
rd = fread(rb, 1, sb.st_size - osize, fp);
if (rd < 1) {
warn("fread");
fclose(fp);
goto cleanup;
}
/* Send message. */
fclose(fp);
fp = openmail();
if (fp == NULL) {
warn("openmail");
goto cleanup;
}
fprintf(fp, "Auto-Submitted: auto-generated\n");
fprintf(fp, "To: %s\nSubject: LOGFILE NOTIFICATION: %s\n\n\n",
ent->whom, ent->log);
fwrite(rb, 1, rd, fp);
fputs("\n\n", fp);
pclose(fp);
}
update:
/* Reopen for writing and update file. */
fp = fopen(fname, "w");
if (fp == NULL) {
warn("%s", fname);
goto cleanup;
}
#ifdef QUAD_OFF_T
fprintf(fp, "%lld\n", (long long)sb.st_size);
#else
fprintf(fp, "%ld\n", (long)sb.st_size);
#endif /* QUAD_OFF_T */
fclose(fp);
cleanup:
free(flog);
if (rb != NULL)
free(rb);
return (1);
}
FILE *
openmail(void)
{
char *cmdbuf = NULL;
FILE *ret;
if (asprintf(&cmdbuf, "%s -t", SENDMAIL) != -1) {
ret = popen(cmdbuf, "w");
free(cmdbuf);
return (ret);
}
return (NULL);
}
/* ARGSUSED */
void
child_killer(int signo)
{
int save_errno = errno;
int status;
while (waitpid(-1, &status, WNOHANG) > 0)
;
errno = save_errno;
}
int
stat_suffix(char *file, size_t size, char *suffix, struct stat *sp,
int (*func)(const char *, struct stat *))
{
size_t n;
n = strlcat(file, suffix, size);
if (n < size && func(file, sp) == 0)
return (0);
file[n - strlen(suffix)] = '\0';
return (-1);
}
/*
* lstat() a log, possibly appending a suffix; order is based on flags.
* Returns the suffix appended (may be empty string) or NULL if no file.
*/
char *
lstat_log(char *file, size_t size, int flags)
{
struct stat sb;
if (flags & CE_COMPACT) {
if (stat_suffix(file, size, COMPRESS_POSTFIX, &sb, lstat) == 0)
return (COMPRESS_POSTFIX);
if (lstat(file, &sb) == 0)
return ("");
} else {
if (lstat(file, &sb) == 0)
return ("");
if (stat_suffix(file, size, COMPRESS_POSTFIX, &sb, lstat) == 0)
return (COMPRESS_POSTFIX);
}
return (NULL);
}
/*
* Parse a limited subset of ISO 8601. The specific format is as follows:
*
* [CC[YY[MM[DD]]]][THH[MM[SS]]] (where `T' is the literal letter)
*
* We don't accept a timezone specification; missing fields (including timezone)
* are defaulted to the current date but time zero.
*/
time_t
parse8601(char *s)
{
struct tm tm, *tmp;
char *t;
long l;
tmp = localtime(&timenow);
tm = *tmp;
tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
l = strtol(s, &t, 10);
if (l < 0 || l >= INT_MAX || (*t != '\0' && *t != 'T'))
return (-1);
/*
* Now t points either to the end of the string (if no time was
* provided) or to the letter `T' which separates date and time in
* ISO 8601. The pointer arithmetic is the same for either case.
*/
switch (t - s) {
case 8:
tm.tm_year = ((l / 1000000) - 19) * 100;
l = l % 1000000;
case 6:
tm.tm_year -= tm.tm_year % 100;
tm.tm_year += l / 10000;
l = l % 10000;
case 4:
tm.tm_mon = (l / 100) - 1;
l = l % 100;
case 2:
tm.tm_mday = l;
case 0:
break;
default:
return (-1);
}
/* sanity check */
if (tm.tm_year < 70 || tm.tm_mon < 0 || tm.tm_mon > 12 ||
tm.tm_mday < 1 || tm.tm_mday > 31)
return (-1);
if (*t != '\0') {
s = ++t;
l = strtol(s, &t, 10);
if (l < 0 || l >= INT_MAX ||
(*t != '\0' && !isspace((unsigned char)*t)))
return (-1);
switch (t - s) {
case 6:
tm.tm_sec = l % 100;
l /= 100;
case 4:
tm.tm_min = l % 100;
l /= 100;
case 2:
tm.tm_hour = l;
case 0:
break;
default:
return (-1);
}
/* sanity check */
if (tm.tm_sec < 0 || tm.tm_sec > 60 || tm.tm_min < 0 ||
tm.tm_min > 59 || tm.tm_hour < 0 || tm.tm_hour > 23)
return (-1);
}
return (mktime(&tm));
}
/*-
* Parse a cyclic time specification, the format is as follows:
*
* [Dhh] or [Wd[Dhh]] or [Mdd[Dhh]]
*
* to rotate a logfile cyclic at
*
* - every day (D) within a specific hour (hh) (hh = 0...23)
* - once a week (W) at a specific day (d) OR (d = 0..6, 0 = Sunday)
* - once a month (M) at a specific day (d) (d = 1..31,l|L)
*
* We don't accept a timezone specification; missing fields
* are defaulted to the current date but time zero.
*/
time_t
parseDWM(char *s)
{
static int mtab[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int WMseen = 0, Dseen = 0, nd;
struct tm tm, *tmp;
char *t;
long l;
tmp = localtime(&timenow);
tm = *tmp;
/* set no. of days per month */
nd = mtab[tm.tm_mon];
if (tm.tm_mon == 1) {
if (((tm.tm_year + 1900) % 4 == 0) &&
((tm.tm_year + 1900) % 100 != 0) &&
((tm.tm_year + 1900) % 400 == 0)) {
nd++; /* leap year, 29 days in february */
}
}
tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
for (;;) {
switch (*s) {
case 'D':
if (Dseen)
return (-1);
Dseen++;
s++;
l = strtol(s, &t, 10);
if (l < 0 || l > 23)
return (-1);
tm.tm_hour = l;
break;
case 'W':
if (WMseen)
return (-1);
WMseen++;
s++;
l = strtol(s, &t, 10);
if (l < 0 || l > 6)
return (-1);
if (l != tm.tm_wday) {
int save;
if (l < tm.tm_wday) {
save = 6 - tm.tm_wday;
save += (l + 1);
} else {
save = l - tm.tm_wday;
}
tm.tm_mday += save;
if (tm.tm_mday > nd) {
tm.tm_mon++;
tm.tm_mday = tm.tm_mday - nd;
}
}
break;
case 'M':
if (WMseen)
return (-1);
WMseen++;
s++;
if (tolower((unsigned char)*s) == 'l') {
tm.tm_mday = nd;
s++;
t = s;
} else {
l = strtol(s, &t, 10);
if (l < 1 || l > 31)
return (-1);
if (l > nd)
return (-1);
if (l < tm.tm_mday)
tm.tm_mon++;
tm.tm_mday = l;
}
break;
default:
return (-1);
break;
}
if (*t == '\0' || isspace((unsigned char)*t))
break;
else
s = t;
}
return (mktime(&tm));
}
/*
* Move a file using rename(2) if possible and copying if not.
*/
int
movefile(char *from, char *to, uid_t owner_uid, gid_t group_gid, mode_t perm)
{
FILE *src, *dst;
int i;
/* try rename(2) first */
if (rename(from, to) == 0) {
if (chmod(to, perm))
warn("can't chmod %s", to);
if (chown(to, owner_uid, group_gid))
warn("can't chown %s", to);
return (0);
} else if (errno != EXDEV)
return (-1);
/* different filesystem, have to copy the file */
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 (fchmod(fileno(dst), perm))
err(1, "can't fchmod %s", to);
if (fchown(fileno(dst), owner_uid, group_gid))
err(1, "can't fchown %s", to);
while ((i = getc(src)) != EOF) {
if ((putc(i, 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", from);
if ((fclose(dst)) != 0)
err(1, "can't fclose %s", to);
if ((unlink(from)) != 0)
err(1, "can't unlink %s", from);
return (0);
}
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