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15
usr.sbin/newsyslog/Makefile Normal file
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# $Id: Makefile,v 1.6 1994/12/22 12:30:26 cgd Exp $
PROG= newsyslog
CFLAGS+= -DOSF
CFLAGS+= -DCONF=\"/etc/newsyslog.conf\"
CFLAGS+= -DPIDFILE=\"/var/run/syslog.pid\"
CFLAGS+= -DCOMPRESS=\"/usr/bin/gzip\"
CFLAGS+= -DCOMPRESS_POSTFIX=\".gz\"
BINOWN= root
MAN8= newsyslog.8
.include <bsd.prog.mk>

168
usr.sbin/newsyslog/newsyslog.8 Normal file
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.TH NEWSYSLOG 8 "January 12, 1989" "Project Athena"
.ns
.\" This file contains changes from the Open Software Foundation.
.\"
.\" from: @(#)newsyslog.8
.\" $Id: newsyslog.8,v 1.6 1995/01/06 19:20:20 jtc Exp $
.\"
.\" 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.
.\"
.sp
.SH NAME
newsyslog \- maintain system log files to manageable sizes
.SH SYNOPSIS
.B /usr/bin/newsyslog
[
.B \-vnr
] [
.B \-f
.I configuration file
]
.SH DESCRIPTION
.I Newsyslog
is a program that should be scheduled to run periodically by
.IR crontab .
When it is executed it archives log files if necessary. If a log file
is determined to require archiving,
.I newsyslog
rearranges the files so that ``logfile'' is empty, ``logfile.0'' has
the last period's logs in it, ``logfile.1'' has the next to last
period's logs in it, and so on, up to a user-specified number of
archived logs. Optionally the archived logs can be compressed to save
space.
.PP
A log can be archived because of two reasons. The log file can have
grown bigger than a preset size in kilobytes, or a preset number of
hours may have elapsed since the last log archive. The granularity of
.I newsyslog
is dependent on how often it is scheduled to run in crontab. Since
the program is quite fast, it may be scheduled to run every hour
without any ill effects.
.PP
When starting up,
.I newsyslog
reads in a configuration file to determine which logs should be looked
at. By default, this configuration file is
.IR /etc/newsyslog.conf .
Each line of the file contains information about a particular log file
that should be handled by
.IR newsyslog .
Each line has five mandatory fields and two optional fields, with a
whitespace separating each field. Blank lines or lines beginning with
``#'' are ignored. The fields of the configuration file are as
follows:
.br
logfile name
.br
owner.group of archives (optional)
.br
mode of logfile & archives
.br
number of archives
.br
size of archives
.br
archive interval
.br
flags (optional)
.PP
The
.I logfile name
entry is the name of the system log file to be archived.
.PP
The optional
.I owner.group
entry specifies an ownership and group for the archive file.
The "." is essential, even if the
.I owner
or
.I group
field is left blank. The
fields may be numeric, or a name which is looked up in
.I /etc/passwd
or
.IR /etc/group .
.PP
The
.I number of archives
entry specifies the number of archives to be kept besides the log file
itself.
.PP
When the size of the logfile reaches
.I size of
.IR archives ,
the logfile becomes trimmed as described above. If this field is
replaced by a ``*'', then the size of the logfile is not taken into
account when determining when to trim the log file.
.PP
The
.I number of hours
entry specifies the time separation between the trimming of the log
file. If this field is replaced by a ``*'', then the number of hours
since the last time the log was trimmed will not be taken into
consideration.
.PP
The
.I flags
field specifies if the archives should have any special processing
done to the archived log files. The ``Z'' flag will make the archive
files compressed to save space using /usr/bin/gzip. The ``B'' flag
means that the file is a binary file, and so the ascii message which
.I newsyslog
inserts to indicate the fact that the logs have been turned over
should not be included.
.PP
.SH OPTIONS
The following options can be used with newsyslog:
.TP
.B \-f \fIconfig-file
instructs newsyslog to use
.I config-file
instead of /etc/newsyslog.conf for its configuration file.
.TP
.B \-v
places
.I newsyslog
in verbose mode. In this mode it will print out each log and its
reasons for either trimming that log or skipping it.
.TP
.B \-n
causes
.I newsyslog
not to trim the logs, but to print out what it would do if this option
were not specified.
.TP
.B \-r
removes the restriction that
.I newsyslog
must be running as root. Of course,
.I newsyslog
will not be able to send a HUP signal to
.IR syslogd ,
so this option should only be used in debugging.
.SH FILES
/etc/newsyslog.conf
.SH BUGS
Doesn't yet automatically read the logs to find security breaches.
.SH AUTHOR
Theodore Ts'o, MIT Project Athena
.br
Copyright 1987, Massachusetts Institute of Technology
.SH "SEE ALSO"
syslogd(8), syslog(3), gzip(1)
.ns
.sp

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usr.sbin/newsyslog/newsyslog.c Normal file
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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.
*
* $Source: /a/cvsroot/src/usr.bin/newsyslog/newsyslog.c,v $
* $Author: jtc $
*/
#ifndef lint
static char rcsid[] = "$Id: newsyslog.c,v 1.9 1995/01/21 21:53:46 jtc Exp $";
#endif /* not lint */
#ifndef CONF
#define CONF "/etc/athena/newsyslog.conf" /* Configuration file */
#endif
#ifndef PIDFILE
#define PIDFILE "/etc/syslog.pid"
#endif
#ifndef COMPRESS
#define COMPRESS "/usr/ucb/compress" /* File compression program */
#endif
#ifndef COMPRESS_POSTFIX
#define COMPRESS_POSTFIX ".Z"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <signal.h>
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/wait.h>
#define kbytes(size) (((size) + 1023) >> 10)
#ifdef _IBMR2
/* Calculates (db * DEV_BSIZE) */
#define dbtob(db) ((unsigned)(db) << UBSHIFT)
#endif
#define CE_COMPACT 1 /* Compact the achived log files */
#define CE_BINARY 2 /* Logfile is in binary, don't add */
/* status messages */
#define NONE -1
struct conf_entry {
char *log; /* Name of the log */
int uid; /* Owner of log */
int 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 */
int permissions; /* File permissions on the log */
int flags; /* Flags (CE_COMPACT & CE_BINARY) */
struct conf_entry *next; /* Linked list pointer */
};
extern int optind;
extern char *optarg;
extern char *malloc();
extern uid_t getuid(),geteuid();
extern time_t time();
char *progname; /* contains argv[0] */
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 */
char *conf = CONF; /* Configuration file to use */
time_t timenow;
int syslog_pid; /* read in from /etc/syslog.pid */
#define MIN_PID 3
#define MAX_PID 65534
char hostname[64]; /* hostname */
char *daytime; /* timenow in human readable form */
struct conf_entry *parse_file();
char *sob(), *son(), *strdup(), *missing_field();
main(argc,argv)
int argc;
char **argv;
{
struct conf_entry *p, *q;
PRS(argc,argv);
if (needroot && getuid() && geteuid()) {
fprintf(stderr,"%s: must have root privs\n",progname);
exit(1);
}
p = q = parse_file();
while (p) {
do_entry(p);
p=p->next;
free((char *) q);
q=p;
}
exit(0);
}
do_entry(ent)
struct conf_entry *ent;
{
int size, modtime;
if (verbose) {
if (ent->flags & CE_COMPACT)
printf("%s <%dZ>: ",ent->log,ent->numlogs);
else
printf("%s <%d>: ",ent->log,ent->numlogs);
}
size = sizefile(ent->log);
modtime = age_old_log(ent->log);
if (size < 0) {
if (verbose)
printf("does not exist.\n");
} else {
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);
if (((ent->size > 0) && (size >= ent->size)) ||
((ent->hours > 0) && ((modtime >= ent->hours)
|| (modtime < 0)))) {
if (verbose)
printf("--> trimming log....\n");
if (noaction && !verbose) {
if (ent->flags & CE_COMPACT)
printf("%s <%dZ>: trimming",
ent->log,ent->numlogs);
else
printf("%s <%d>: trimming",
ent->log,ent->numlogs);
}
dotrim(ent->log, ent->numlogs, ent->flags,
ent->permissions, ent->uid, ent->gid);
} else {
if (verbose)
printf("--> skipping\n");
}
}
}
PRS(argc,argv)
int argc;
char **argv;
{
int c;
FILE *f;
char line[BUFSIZ];
char *p;
progname = argv[0];
timenow = time((time_t *) 0);
daytime = ctime(&timenow) + 4;
daytime[16] = '\0';
/* Let's find the pid of syslogd */
syslog_pid = 0;
f = fopen(PIDFILE,"r");
if (f && fgets(line,BUFSIZ,f))
syslog_pid = atoi(line);
if (f)
(void)fclose(f);
/* Let's get our hostname */
(void) gethostname(hostname, sizeof(hostname));
/* Truncate domain */
if (p = strchr(hostname, '.')) {
*p = '\0';
}
optind = 1; /* Start options parsing */
while ((c=getopt(argc,argv,"nrvf:t:")) != EOF)
switch (c) {
case 'n':
noaction++; /* This implies needroot as off */
/* fall through */
case 'r':
needroot = 0;
break;
case 'v':
verbose++;
break;
case 'f':
conf = optarg;
break;
default:
usage();
}
}
usage()
{
fprintf(stderr,
"Usage: %s <-nrv> <-f config-file>\n", progname);
exit(1);
}
/* Parse a configuration file and return a linked list of all the logs
* to process
*/
struct conf_entry *parse_file()
{
FILE *f;
char line[BUFSIZ], *parse, *q;
char *errline, *group;
struct conf_entry *first = NULL;
struct conf_entry *working;
struct passwd *pass;
struct group *grp;
if (strcmp(conf,"-"))
f = fopen(conf,"r");
else
f = stdin;
if (!f) {
(void) fprintf(stderr,"%s: ",progname);
perror(conf);
exit(1);
}
while (fgets(line,BUFSIZ,f)) {
if ((line[0]== '\n') || (line[0] == '#'))
continue;
errline = strdup(line);
if (!first) {
working = (struct conf_entry *) malloc(sizeof(struct conf_entry));
first = working;
} else {
working->next = (struct conf_entry *) malloc(sizeof(struct conf_entry));
working = working->next;
}
q = parse = missing_field(sob(line),errline);
*(parse = son(line)) = '\0';
working->log = strdup(q);
q = parse = missing_field(sob(++parse),errline);
*(parse = son(parse)) = '\0';
if ((group = strchr(q, '.')) != NULL) {
*group++ = '\0';
if (*q) {
if (!(isnumber(*q))) {
if ((pass = getpwnam(q)) == NULL) {
fprintf(stderr,
"Error in config file; unknown user:\n");
fputs(errline,stderr);
exit(1);
}
working->uid = pass->pw_uid;
} else
working->uid = atoi(q);
} else
working->uid = NONE;
q = group;
if (*q) {
if (!(isnumber(*q))) {
if ((grp = getgrnam(q)) == NULL) {
fprintf(stderr,
"Error in config file; unknown group:\n");
fputs(errline,stderr);
exit(1);
}
working->gid = grp->gr_gid;
} else
working->gid = atoi(q);
} else
working->gid = NONE;
q = parse = missing_field(sob(++parse),errline);
*(parse = son(parse)) = '\0';
}
else
working->uid = working->gid = NONE;
if (!sscanf(q,"%o",&working->permissions)) {
fprintf(stderr,
"Error in config file; bad permissions:\n");
fputs(errline,stderr);
exit(1);
}
q = parse = missing_field(sob(++parse),errline);
*(parse = son(parse)) = '\0';
if (!sscanf(q,"%d",&working->numlogs)) {
fprintf(stderr,
"Error in config file; bad number:\n");
fputs(errline,stderr);
exit(1);
}
q = parse = missing_field(sob(++parse),errline);
*(parse = son(parse)) = '\0';
if (isdigit(*q))
working->size = atoi(q);
else
working->size = -1;
q = parse = missing_field(sob(++parse),errline);
*(parse = son(parse)) = '\0';
if (isdigit(*q))
working->hours = atoi(q);
else
working->hours = -1;
q = parse = sob(++parse); /* Optional field */
*(parse = son(parse)) = '\0';
working->flags = 0;
while (q && *q && !isspace(*q)) {
if ((*q == 'Z') || (*q == 'z'))
working->flags |= CE_COMPACT;
else if ((*q == 'B') || (*q == 'b'))
working->flags |= CE_BINARY;
else {
fprintf(stderr,
"Illegal flag in config file -- %c\n",
*q);
exit(1);
}
q++;
}
free(errline);
}
if (working)
working->next = (struct conf_entry *) NULL;
(void) fclose(f);
return(first);
}
char *missing_field(p,errline)
char *p,*errline;
{
if (!p || !*p) {
fprintf(stderr,"Missing field in config file:\n");
fputs(errline,stderr);
exit(1);
}
return(p);
}
dotrim(log,numdays,flags,perm,owner_uid,group_gid)
char *log;
int numdays;
int flags;
int perm;
int owner_uid;
int group_gid;
{
char file1[128], file2[128];
char zfile1[128], zfile2[128];
int fd;
struct stat st;
#ifdef _IBMR2
/* AIX 3.1 has a broken fchown- if the owner_uid is -1, it will actually */
/* change it to be owned by uid -1, instead of leaving it as is, as it is */
/* supposed to. */
if (owner_uid == -1)
owner_uid = geteuid();
#endif
/* Remove oldest log */
(void) sprintf(file1,"%s.%d",log,numdays);
(void) strcpy(zfile1, file1);
(void) strcat(zfile1, COMPRESS_POSTFIX);
if (noaction) {
printf("rm -f %s\n", file1);
printf("rm -f %s\n", zfile1);
} else {
(void) unlink(file1);
(void) unlink(zfile1);
}
/* Move down log files */
while (numdays--) {
(void) strcpy(file2,file1);
(void) sprintf(file1,"%s.%d",log,numdays);
(void) strcpy(zfile1, file1);
(void) strcpy(zfile2, file2);
if (lstat(file1, &st)) {
(void) strcat(zfile1, COMPRESS_POSTFIX);
(void) strcat(zfile2, COMPRESS_POSTFIX);
if (lstat(zfile1, &st)) continue;
}
if (noaction) {
printf("mv %s %s\n",zfile1,zfile2);
printf("chmod %o %s\n", perm, zfile2);
printf("chown %d.%d %s\n",
owner_uid, group_gid, zfile2);
} else {
(void) rename(zfile1, zfile2);
(void) chmod(zfile2, perm);
(void) chown(zfile2, owner_uid, group_gid);
}
}
if (!noaction && !(flags & CE_BINARY))
(void) log_trim(log); /* Report the trimming to the old log */
if (noaction)
printf("mv %s to %s\n",log,file1);
else
(void) rename(log,file1);
if (noaction)
printf("Start new log...");
else {
fd = creat(log,perm);
if (fd < 0) {
perror("can't start new log");
exit(1);
}
if (fchown(fd, owner_uid, group_gid)) {
perror("can't chmod new log file");
exit(1);
}
(void) close(fd);
if (!(flags & CE_BINARY))
if (log_trim(log)) { /* Add status message */
perror("can't add status message to log");
exit(1);
}
}
if (noaction)
printf("chmod %o %s...",perm,log);
else
(void) chmod(log,perm);
if (noaction)
printf("kill -HUP %d (syslogd)\n",syslog_pid);
else
if (syslog_pid < MIN_PID || syslog_pid > MAX_PID) {
fprintf(stderr,"%s: preposterous process number: %d\n",
progname, syslog_pid);
} else if (kill(syslog_pid,SIGHUP)) {
fprintf(stderr,"%s: ",progname);
perror("warning - could not restart syslogd");
}
if (flags & CE_COMPACT) {
if (noaction)
printf("Compress %s.0\n",log);
else
compress_log(log);
}
}
/* Log the fact that the logs were turned over */
log_trim(log)
char *log;
{
FILE *f;
if ((f = fopen(log,"a")) == NULL)
return(-1);
fprintf(f,"%s %s newsyslog[%d]: logfile turned over\n",
daytime, hostname, getpid());
if (fclose(f) == EOF) {
perror("log_trim: fclose:");
exit(1);
}
return(0);
}
/* Fork of /usr/ucb/compress to compress the old log file */
compress_log(log)
char *log;
{
int pid;
char tmp[128];
pid = fork();
(void) sprintf(tmp,"%s.0",log);
if (pid < 0) {
fprintf(stderr,"%s: ",progname);
perror("fork");
exit(1);
} else if (!pid) {
(void) execl(COMPRESS,"compress","-f",tmp,0);
fprintf(stderr,"%s: ",progname);
perror(COMPRESS);
exit(1);
}
}
/* Return size in kilobytes of a file */
int sizefile(file)
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) */
int age_old_log(file)
char *file;
{
struct stat sb;
char tmp[MAXPATHLEN+3];
(void) strcpy(tmp,file);
if (stat(strcat(tmp,".0"),&sb) < 0)
if (stat(strcat(tmp,COMPRESS_POSTFIX), &sb) < 0)
return(-1);
return( (int) (timenow - sb.st_mtime + 1800) / 3600);
}
#ifndef OSF
/* Duplicate a string using malloc */
char *strdup(strp)
register char *strp;
{
register char *cp;
if ((cp = malloc((unsigned) strlen(strp) + 1)) == NULL)
abort();
return(strcpy (cp, strp));
}
#endif
/* Skip Over Blanks */
char *sob(p)
register char *p;
{
while (p && *p && isspace(*p))
p++;
return(p);
}
/* Skip Over Non-Blanks */
char *son(p)
register char *p;
{
while (p && *p && !isspace(*p))
p++;
return(p);
}