2beab49a06
- ensure hostname from gethostname() is nul-terminated in all cases - minor KNF - use MAXHOSTNAMELEN over various other values/defines - be safe will buffers that hold hostnames
615 lines
19 KiB
C
615 lines
19 KiB
C
/* $NetBSD: newsyslog.c,v 1.15 1998/07/06 06:54:06 mrg Exp $ */
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/*
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* This file contains changes from the Open Software Foundation.
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*/
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/*
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Copyright 1988, 1989 by the Massachusetts Institute of Technology
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is
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hereby granted, provided that the above copyright notice
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appear in all copies and that both that copyright notice and
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this permission notice appear in supporting documentation,
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and that the names of M.I.T. and the M.I.T. S.I.P.B. not be
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used in advertising or publicity pertaining to distribution
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of the software without specific, written prior permission.
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M.I.T. and the M.I.T. S.I.P.B. make no representations about
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the suitability of this software for any purpose. It is
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provided "as is" without express or implied warranty.
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*/
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/*
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* newsyslog - roll over selected logs at the appropriate time,
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* keeping the a specified number of backup files around.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: newsyslog.c,v 1.15 1998/07/06 06:54:06 mrg Exp $");
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#endif /* not lint */
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#ifndef CONF
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#define CONF "/etc/athena/newsyslog.conf" /* Configuration file */
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#endif
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#ifndef PIDFILE
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#define PIDFILE "/etc/syslog.pid"
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#endif
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#ifndef COMPRESS
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#define COMPRESS "/usr/ucb/compress" /* File compression program */
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#endif
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#ifndef COMPRESS_POSTFIX
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#define COMPRESS_POSTFIX ".Z"
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#endif
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include <sys/wait.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#define kbytes(size) (((size) + 1023) >> 10)
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#ifdef _IBMR2
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/* Calculates (db * DEV_BSIZE) */
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#define dbtob(db) ((unsigned)(db) << UBSHIFT)
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#endif
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#define CE_COMPACT 1 /* Compact the achived log files */
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#define CE_BINARY 2 /* Logfile is in binary, don't add */
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/* status messages */
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#define NONE -1
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struct conf_entry {
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char *log; /* Name of the log */
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int uid; /* Owner of log */
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int gid; /* Group of log */
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int numlogs; /* Number of logs to keep */
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int size; /* Size cutoff to trigger trimming the log */
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int hours; /* Hours between log trimming */
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int permissions; /* File permissions on the log */
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int flags; /* Flags (CE_COMPACT & CE_BINARY) */
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struct conf_entry *next; /* Linked list pointer */
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};
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char *progname; /* contains argv[0] */
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int verbose = 0; /* Print out what's going on */
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int needroot = 1; /* Root privs are necessary */
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int noaction = 0; /* Don't do anything, just show it */
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char *conf = CONF; /* Configuration file to use */
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time_t timenow;
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int syslog_pid; /* read in from /etc/syslog.pid */
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#define MIN_PID 3
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#define MAX_PID 65534
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char hostname[MAXHOSTNAMELEN + 1]; /* hostname */
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char *daytime; /* timenow in human readable form */
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void PRS __P((int, char **));
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int age_old_log __P((char *));
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void compress_log __P((char *));
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void dotrim __P((char *, int, int, int, int, int));
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void do_entry __P((struct conf_entry *));
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int isnumber __P((char *));
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int log_trim __P((char *));
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int main __P((int, char **));
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char *missing_field __P((char *, char *));
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struct conf_entry *parse_file __P((void));
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int sizefile __P((char *));
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char *sob __P((char *));
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char *son __P((char *));
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void usage __P((void));
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int
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main(argc,argv)
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int argc;
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char **argv;
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{
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struct conf_entry *p, *q;
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PRS(argc,argv);
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if (needroot && getuid() && geteuid()) {
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fprintf(stderr,"%s: must have root privs\n",progname);
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exit(1);
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}
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p = q = parse_file();
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while (p) {
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do_entry(p);
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p=p->next;
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free((char *) q);
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q=p;
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}
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exit(0);
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}
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void
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do_entry(ent)
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struct conf_entry *ent;
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{
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int size, modtime;
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if (verbose) {
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if (ent->flags & CE_COMPACT)
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printf("%s <%dZ>: ",ent->log,ent->numlogs);
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else
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printf("%s <%d>: ",ent->log,ent->numlogs);
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}
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size = sizefile(ent->log);
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modtime = age_old_log(ent->log);
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if (size < 0) {
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if (verbose)
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printf("does not exist.\n");
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} else {
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if (verbose && (ent->size > 0))
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printf("size (Kb): %d [%d] ", size, ent->size);
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if (verbose && (ent->hours > 0))
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printf(" age (hr): %d [%d] ", modtime, ent->hours);
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if (((ent->size > 0) && (size >= ent->size)) ||
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((ent->hours > 0) && ((modtime >= ent->hours)
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|| (modtime < 0)))) {
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if (verbose)
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printf("--> trimming log....\n");
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if (noaction && !verbose) {
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if (ent->flags & CE_COMPACT)
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printf("%s <%dZ>: trimming",
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ent->log,ent->numlogs);
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else
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printf("%s <%d>: trimming",
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ent->log,ent->numlogs);
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}
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dotrim(ent->log, ent->numlogs, ent->flags,
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ent->permissions, ent->uid, ent->gid);
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} else {
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if (verbose)
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printf("--> skipping\n");
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}
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}
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}
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void
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PRS(argc,argv)
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int argc;
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char **argv;
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{
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int c;
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FILE *f;
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char line[BUFSIZ];
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char *p;
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progname = argv[0];
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timenow = time((time_t *) 0);
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daytime = ctime(&timenow) + 4;
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daytime[15] = '\0';
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/* Let's find the pid of syslogd */
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syslog_pid = 0;
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f = fopen(PIDFILE,"r");
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if (f && fgets(line,BUFSIZ,f))
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syslog_pid = atoi(line);
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if (f)
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(void)fclose(f);
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/* Let's get our hostname */
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(void)gethostname(hostname, sizeof(hostname));
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hostname[sizeof(hostname) - 1] = '\0';
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/* Truncate domain */
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if ((p = strchr(hostname, '.')) != NULL) {
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*p = '\0';
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}
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optind = 1; /* Start options parsing */
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while ((c=getopt(argc,argv,"nrvf:t:")) != -1)
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switch (c) {
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case 'n':
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noaction++; /* This implies needroot as off */
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/* fall through */
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case 'r':
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needroot = 0;
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break;
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case 'v':
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verbose++;
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break;
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case 'f':
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conf = optarg;
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break;
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default:
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usage();
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}
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}
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void
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usage()
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{
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fprintf(stderr,
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"Usage: %s <-nrv> <-f config-file>\n", progname);
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exit(1);
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}
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/* Parse a configuration file and return a linked list of all the logs
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* to process
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*/
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struct conf_entry *
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parse_file()
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{
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FILE *f;
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char line[BUFSIZ], *parse, *q;
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char *errline, *group;
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struct conf_entry *first = NULL;
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struct conf_entry *working;
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struct passwd *pass;
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struct group *grp;
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working = NULL;
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if (strcmp(conf,"-"))
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f = fopen(conf,"r");
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else
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f = stdin;
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if (!f) {
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(void) fprintf(stderr,"%s: ",progname);
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perror(conf);
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exit(1);
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}
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while (fgets(line,BUFSIZ,f)) {
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if ((line[0]== '\n') || (line[0] == '#'))
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continue;
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errline = strdup(line);
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if (!first) {
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working = (struct conf_entry *) malloc(sizeof(struct conf_entry));
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first = working;
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} else {
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working->next = (struct conf_entry *) malloc(sizeof(struct conf_entry));
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working = working->next;
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}
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q = parse = missing_field(sob(line),errline);
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*(parse = son(line)) = '\0';
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working->log = strdup(q);
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q = parse = missing_field(sob(++parse),errline);
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*(parse = son(parse)) = '\0';
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if ((group = strchr(q, '.')) != NULL) {
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*group++ = '\0';
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if (*q) {
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if (!(isnumber(q))) {
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if ((pass = getpwnam(q)) == NULL) {
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fprintf(stderr,
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"Error in config file; unknown user:\n");
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fputs(errline,stderr);
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exit(1);
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}
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working->uid = pass->pw_uid;
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} else
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working->uid = atoi(q);
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} else
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working->uid = NONE;
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q = group;
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if (*q) {
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if (!(isnumber(q))) {
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if ((grp = getgrnam(q)) == NULL) {
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fprintf(stderr,
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"Error in config file; unknown group:\n");
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fputs(errline,stderr);
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exit(1);
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}
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working->gid = grp->gr_gid;
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} else
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working->gid = atoi(q);
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} else
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working->gid = NONE;
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q = parse = missing_field(sob(++parse),errline);
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*(parse = son(parse)) = '\0';
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}
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else
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working->uid = working->gid = NONE;
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if (!sscanf(q,"%o",&working->permissions)) {
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fprintf(stderr,
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"Error in config file; bad permissions:\n");
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fputs(errline,stderr);
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exit(1);
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}
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q = parse = missing_field(sob(++parse),errline);
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*(parse = son(parse)) = '\0';
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if (!sscanf(q,"%d",&working->numlogs)) {
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fprintf(stderr,
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"Error in config file; bad number:\n");
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fputs(errline,stderr);
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exit(1);
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}
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q = parse = missing_field(sob(++parse),errline);
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*(parse = son(parse)) = '\0';
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if (isdigit(*q))
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working->size = atoi(q);
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else
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working->size = -1;
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q = parse = missing_field(sob(++parse),errline);
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*(parse = son(parse)) = '\0';
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if (isdigit(*q))
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working->hours = atoi(q);
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else
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working->hours = -1;
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q = parse = sob(++parse); /* Optional field */
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*(parse = son(parse)) = '\0';
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working->flags = 0;
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while (q && *q && !isspace(*q)) {
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if ((*q == 'Z') || (*q == 'z'))
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working->flags |= CE_COMPACT;
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else if ((*q == 'B') || (*q == 'b'))
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working->flags |= CE_BINARY;
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else {
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fprintf(stderr,
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"Illegal flag in config file -- %c\n",
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*q);
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exit(1);
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}
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q++;
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}
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free(errline);
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}
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if (working)
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working->next = (struct conf_entry *) NULL;
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(void) fclose(f);
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return(first);
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}
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char *
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missing_field(p,errline)
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char *p,*errline;
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{
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if (!p || !*p) {
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fprintf(stderr,"Missing field in config file:\n");
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fputs(errline,stderr);
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exit(1);
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}
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return(p);
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}
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void
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dotrim(log,numdays,flags,perm,owner_uid,group_gid)
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char *log;
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int numdays;
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int flags;
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int perm;
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int owner_uid;
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int group_gid;
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{
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char file1[128], file2[128];
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char zfile1[128], zfile2[128];
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int fd;
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struct stat st;
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int ngen = numdays;
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#ifdef _IBMR2
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/* AIX 3.1 has a broken fchown- if the owner_uid is -1, it will actually */
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/* change it to be owned by uid -1, instead of leaving it as is, as it is */
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/* supposed to. */
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if (owner_uid == -1)
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owner_uid = geteuid();
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#endif
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/* Remove oldest log */
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(void) sprintf(file1,"%s.%d",log,numdays);
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(void) strcpy(zfile1, file1);
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(void) strcat(zfile1, COMPRESS_POSTFIX);
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if (noaction) {
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printf("rm -f %s\n", file1);
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printf("rm -f %s\n", zfile1);
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} else {
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(void) unlink(file1);
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(void) unlink(zfile1);
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}
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/* Move down log files */
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while (numdays--) {
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(void) strcpy(file2,file1);
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(void) sprintf(file1,"%s.%d",log,numdays);
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(void) strcpy(zfile1, file1);
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(void) strcpy(zfile2, file2);
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if (lstat(file1, &st)) {
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(void) strcat(zfile1, COMPRESS_POSTFIX);
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(void) strcat(zfile2, COMPRESS_POSTFIX);
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if (lstat(zfile1, &st)) continue;
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}
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if (noaction) {
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printf("mv %s %s\n",zfile1,zfile2);
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printf("chmod %o %s\n", perm, zfile2);
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printf("chown %d.%d %s\n",
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owner_uid, group_gid, zfile2);
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} else {
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(void) rename(zfile1, zfile2);
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(void) chmod(zfile2, perm);
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(void) chown(zfile2, owner_uid, group_gid);
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}
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}
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if (!noaction && !(flags & CE_BINARY))
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(void) log_trim(log); /* Report the trimming to the old log */
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if (ngen == 0)
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if (noaction)
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printf("rm %s\n",log);
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else
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(void) unlink(log);
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else
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if (noaction)
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printf("mv %s to %s\n",log,file1);
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else
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(void) rename(log,file1);
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if (noaction)
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printf("Start new log...");
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else {
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fd = creat(log,perm);
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if (fd < 0) {
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perror("can't start new log");
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exit(1);
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}
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if (fchown(fd, owner_uid, group_gid)) {
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perror("can't chmod new log file");
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exit(1);
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}
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(void) close(fd);
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if (!(flags & CE_BINARY))
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if (log_trim(log)) { /* Add status message */
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perror("can't add status message to log");
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exit(1);
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}
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}
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if (noaction)
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printf("chmod %o %s...",perm,log);
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else
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(void) chmod(log,perm);
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if (noaction)
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printf("kill -HUP %d (syslogd)\n",syslog_pid);
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else
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if (syslog_pid < MIN_PID || syslog_pid > MAX_PID) {
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fprintf(stderr,"%s: preposterous process number: %d\n",
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progname, syslog_pid);
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} else if (kill(syslog_pid,SIGHUP)) {
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fprintf(stderr,"%s: ",progname);
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perror("warning - could not restart syslogd");
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}
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if (flags & CE_COMPACT) {
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if (noaction)
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printf("Compress %s.0\n",log);
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else
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compress_log(log);
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}
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}
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/* Log the fact that the logs were turned over */
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int
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log_trim(log)
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char *log;
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{
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FILE *f;
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if ((f = fopen(log,"a")) == NULL)
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return(-1);
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fprintf(f,"%s %s newsyslog[%d]: logfile turned over\n",
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daytime, hostname, getpid());
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if (fclose(f) == EOF) {
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perror("log_trim: fclose:");
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exit(1);
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}
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return(0);
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}
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/* Fork of /usr/ucb/compress to compress the old log file */
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void
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compress_log(log)
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char *log;
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{
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int pid;
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char tmp[128];
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pid = fork();
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(void) sprintf(tmp,"%s.0",log);
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if (pid < 0) {
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fprintf(stderr,"%s: ",progname);
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perror("fork");
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exit(1);
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} else if (!pid) {
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(void) execl(COMPRESS,"compress","-f",tmp,0);
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fprintf(stderr,"%s: ",progname);
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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)
|
|
char *strp;
|
|
{
|
|
char *cp;
|
|
|
|
if ((cp = malloc((unsigned) strlen(strp) + 1)) == NULL)
|
|
abort();
|
|
return(strcpy (cp, strp));
|
|
}
|
|
#endif
|
|
|
|
/* Skip Over Blanks */
|
|
char *sob(p)
|
|
char *p;
|
|
{
|
|
while (p && *p && isspace(*p))
|
|
p++;
|
|
return(p);
|
|
}
|
|
|
|
/* Skip Over Non-Blanks */
|
|
char *
|
|
son(p)
|
|
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 (*string < '0' || *string > '9') return(0);
|
|
string++;
|
|
}
|
|
return(1);
|
|
}
|