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Gives syslogd(8) the ability to refresh its idea of the hostname of

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the system on which it is running. The hostname is reloaded when
'HUPped' and a log message generated to note a change (before anyone
points it out, this is not an added security feature).

PR:		bin/24444
Reviewed by:	freebsd-audit
Approved by:	ru
MFC after:	2 weeks
This commit is contained in:
Crist J. Clark 2001-08-27 21:37:15 +00:00
parent d626906b0c
commit ba1cc9067d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=82442
1 changed files with 27 additions and 7 deletions
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34
usr.sbin/syslogd/syslogd.c
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@ -318,7 +318,7 @@ main(argc, argv)
struct sockaddr_un sunx, fromunix;
struct sockaddr_storage frominet;
FILE *fp;
char *p, *hname, line[MAXLINE + 1];
char *hname, line[MAXLINE + 1];
struct timeval tv, *tvp;
struct sigaction sact;
sigset_t mask;
@ -398,12 +398,6 @@ main(argc, argv)
consfile.f_type = F_CONSOLE;
(void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1);
(void)gethostname(LocalHostName, sizeof(LocalHostName));
if ((p = strchr(LocalHostName, '.')) != NULL) {
*p++ = '\0';
LocalDomain = p;
} else
LocalDomain = "";
(void)strcpy(bootfile, getbootfile());
(void)signal(SIGTERM, die);
(void)signal(SIGINT, Debug ? die : SIG_IGN);
@ -1346,9 +1340,25 @@ init(signo)
char cline[LINE_MAX];
char prog[NAME_MAX+1];
char host[MAXHOSTNAMELEN];
char oldLocalHostName[MAXHOSTNAMELEN];
char hostMsg[2*MAXHOSTNAMELEN+40];
dprintf("init\n");
/*
* Load hostname (may have changed).
*/
if (signo != 0)
(void)strlcpy(oldLocalHostName, LocalHostName,
sizeof(oldLocalHostName));
if (gethostname(LocalHostName, sizeof(LocalHostName)))
err(EX_OSERR, "gethostname() failed");
if ((p = strchr(LocalHostName, '.')) != NULL) {
*p++ = '\0';
LocalDomain = p;
} else
LocalDomain = "";
/*
* Close all open log files.
*/
@ -1498,6 +1508,16 @@ init(signo)
logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE);
dprintf("syslogd: restarted\n");
/*
* Log a change in hostname, but only on a restart.
*/
if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
(void)snprintf(hostMsg, sizeof(hostMsg),
"syslogd: hostname changed, \"%s\" to \"%s\"",
oldLocalHostName, LocalHostName);
logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE);
dprintf("%s\n", hostMsg);
}
}
/*