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freebsd-dev/usr.sbin/newsyslog/newsyslog.c
Thomas Graichen 9bf204a77e Submitted by: charnier@lirmm.fr (Philippe Charnier) 
1) correct MAX_PID according to system definition.
2) replace fprintf(stderr,...)/perror/exit by 4.4 equivalence.
3) make strings enough larger so they can't overflow: MAXHOSTNAMELEN for
   host and MAXPATHLEN for filenames.
4) call execl with correct parameters (compress -> gzip).
1996-01-16 10:32:04 +00:00

537 lines
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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.
*
* $Source: /home/ncvs/src/usr.sbin/newsyslog/newsyslog.c,v $
* $Author: graichen $
*/
#ifndef lint
static char rcsid[] = "$Id: newsyslog.c,v 1.2 1996/01/09 08:40:08 graichen 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_PATH
#define COMPRESS_PATH "/usr/ucb/compress" /* File compression program */
#endif
#ifndef COMPRESS_PROG
#define COMPRESS_PROG "compress"
#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 30000 /* was 65534, see /usr/include/sys/proc.h */
char hostname[MAXHOSTNAMELEN+1]; /* 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[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 */
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)
err(1, "%s", conf);
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)
errx(1,
"Error in config file; unknown user:\n%s",
errline);
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)
errx(1,
"Error in config file; unknown group:\n%s",
errline);
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))
errx(1, "Error in config file; bad permissions:\n%s",
errline);
q = parse = missing_field(sob(++parse),errline);
*(parse = son(parse)) = '\0';
if (!sscanf(q,"%d",&working->numlogs))
errx(1, "Error in config file; bad number:\n%s",
errline);
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
errx(1, "Illegal flag in config file -- %c", *q);
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)
errx(1, "Missing field in config file:\n%s", errline);
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 [MAXPATHLEN+1], file2 [MAXPATHLEN+1];
char zfile1[MAXPATHLEN+1], zfile2[MAXPATHLEN+1];
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)
err(1, "can't start new log");
if (fchown(fd, owner_uid, group_gid))
err(1, "can't chmod new log file");
(void) close(fd);
if (!(flags & CE_BINARY))
if (log_trim(log)) /* Add status message */
err(1, "can't add status message to log");
}
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) {
warnx("preposterous process number: %d", syslog_pid);
} else if (kill(syslog_pid,SIGHUP))
warn("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)
err(1, "log_trim: fclose:");
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)
err(1, "fork");
else if (!pid) {
(void) execl(COMPRESS_PATH,COMPRESS_PROG,"-f",tmp,0);
err(1, COMPRESS_PATH);
}
}
/* 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+sizeof(".0")+sizeof(COMPRESS_POSTFIX)+1];
(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);
}
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