File: [local] / src / usr.bin / newsyslog / newsyslog.c (download)
Revision 1.9, Sun Apr 27 13:48:55 1997 UTC (27 years, 1 month ago) by downsj
Branch: MAIN
CVS Tags: OPENBSD_2_1_BASE, OPENBSD_2_1
Changes since 1.8: +37 -56 lines
Prototype fixes and cruft removal.
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/* $OpenBSD: newsyslog.c,v 1.9 1997/04/27 13:48:55 downsj Exp $ */
/*
* 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.
*
*/
#ifndef lint
static char rcsid[] = "$OpenBSD: newsyslog.c,v 1.9 1997/04/27 13:48:55 downsj 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 <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <signal.h>
#include <fcntl.h>
#include <pwd.h>
#include <grp.h>
#include <unistd.h>
#define kbytes(size) (((size) + 1023) >> 10)
#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 */
};
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[MAXHOSTNAMELEN]; /* hostname */
char *daytime; /* timenow in human readable form */
void do_entry __P((struct conf_entry *));
void PRS __P((int, char **));
void usage __P((void));
struct conf_entry *parse_file __P((void));
char *missing_field __P((char *, char *));
void dotrim __P((char *, int, int, int, int, int));
int log_trim __P((char *));
void compress_log __P((char *));
int sizefile __P((char *));
int age_old_log __P((char *));
char *sob __P((char *));
char *son __P((char *));
int isnumber __P((char *));
int 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);
}
void 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");
}
}
}
void 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[15] = '\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 */
p = strchr(hostname, '.');
if (p)
*p = '\0';
optind = 1; /* Start options parsing */
while ((c = getopt(argc,argv,"nrvf:t:")) != -1) {
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();
}
}
}
void 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);
}
void 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[MAXPATHLEN], file2[MAXPATHLEN];
char zfile1[MAXPATHLEN], zfile2[MAXPATHLEN];
int fd;
struct stat st;
int days = numdays;
/* 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 (days == 0) {
if (noaction)
printf("rm %s\n",log);
else
(void) unlink(log);
} else {
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 */
int 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 */
void compress_log(log)
char *log;
{
int pid;
char tmp[MAXPATHLEN];
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];
(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);
}
/* 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);
}
/* Check if string is actually a number */
int isnumber(string)
char *string;
{
while (*string != '\0') {
if (!isdigit(*string++))
return(0);
}
return(1);
}
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