mirror of
https://github.com/sheumann/hush.git
synced 2024-12-22 14:30:31 +00:00
97 lines
4.2 KiB
Plaintext
97 lines
4.2 KiB
Plaintext
Logging and backgrounding
|
|
|
|
By default, bb_[p]error_msg[_and_die] messages go to stderr,
|
|
and of course, usually applets do not auto-background. :)
|
|
|
|
Historically, daemons and inetd services are different.
|
|
|
|
Busybox is trying to provide compatible behavior, thus if an applet
|
|
is emulating an existing utility, it should mimic it. If utility
|
|
auto-backgrounds itself, busybox applet should do the same.
|
|
If utility normally logs to syslog, busybox applet should do
|
|
the same too.
|
|
|
|
However, busybox should not needlessly restrict the freedom
|
|
of the users. And users have different needs and different preferences.
|
|
Some might like logging everything from daemons to syslog.
|
|
Others prefer running stuff under runsv/svlogd and thus would like
|
|
logging to stderr and no daemonization.
|
|
|
|
To help with that, busybox applets should have options to override
|
|
default behavior, whatever that is for a given applet.
|
|
|
|
|
|
Current situation is a bit of a mess:
|
|
|
|
acpid - auto-backgrounds unless -d
|
|
crond - auto-backgrounds unless -f, logs to syslog unless -d or -L.
|
|
option -d logs to stderr, -L FILE logs to FILE
|
|
devfsd - (obsolete)
|
|
dnsd - option -d makes it background and log to syslog
|
|
fakeidentd - inetd service. Auto-backgrounds and logs to syslog
|
|
if no -f and no -i and no -w (-i is "inetd service" flag,
|
|
-w is "inetd-wait service" flag)
|
|
ftpd - inetd service. Logs to syslog with -S, with -v logs to strerr too
|
|
httpd - auto-backgrounds unless -f or -i (-i is "inetd service" flag)
|
|
inetd - auto-backgrounds unless -f, logs to syslog unless -e
|
|
klogd - auto-backgrounds unless -n
|
|
syslogd - auto-backgrounds unless -n
|
|
telnetd - auto-backgrounds unless -f or -i (-i is "inetd service" flag)
|
|
udhcpc - auto-backgrounds unless -f after lease is obtained,
|
|
option -b makes it background sooner (when lease attempt
|
|
fails and retries start),
|
|
after backgrounding it stops logging to stderr;
|
|
logs to stderr, but option -S makes it log *also* to syslog
|
|
udhcpd - auto-backgrounds and do not log to stderr unless -f,
|
|
otherwise logs to stderr, but option -S makes it log *also* to syslog
|
|
zcip - auto-backgrounds and logs *also* to syslog unless -f
|
|
|
|
Total: 13 applets (+1 obsolete),
|
|
4 log to syslog by default (crond fakeidentd inetd zcip),
|
|
5 never log to syslog (acpid httpd telnetd klogd syslogd, last two
|
|
- for obviously correct reasons),
|
|
there are no daemons which always log to syslog,
|
|
12 auto-background if not run as inetd services (all except dnsd.
|
|
Note that there is no "standard" dnsd AFAIKS). But see below
|
|
for daemons (tcpsvd etc) which don't auto-background.
|
|
|
|
miscutils/crond.c: logmode = LOGMODE_SYSLOG;
|
|
networking/dnsd.c: logmode = LOGMODE_SYSLOG;
|
|
networking/ftpd.c: logmode = LOGMODE_NONE;
|
|
networking/ftpd.c: logmode |= LOGMODE_SYSLOG;
|
|
networking/inetd.c: logmode = LOGMODE_SYSLOG;
|
|
networking/isrv_identd.c: logmode = LOGMODE_SYSLOG;
|
|
networking/telnetd.c: logmode = LOGMODE_SYSLOG;
|
|
networking/udhcp/dhcpc.c: logmode = LOGMODE_NONE;
|
|
networking/udhcp/dhcpc.c: logmode |= LOGMODE_SYSLOG;
|
|
networking/udhcp/dhcpc.c: logmode &= ~LOGMODE_STDIO;
|
|
networking/udhcp/dhcpd.c: logmode = LOGMODE_NONE;
|
|
networking/udhcp/dhcpd.c: logmode |= LOGMODE_SYSLOG;
|
|
networking/zcip.c: logmode |= LOGMODE_SYSLOG;
|
|
|
|
|
|
These daemons never auto-background and never log to syslog:
|
|
|
|
lpd - inetd service. Has nothing to log so far, though
|
|
dhcprelay - standard behavior
|
|
inotifyd - standard behavior
|
|
runsv - standard behavior
|
|
runsvdir - standard behavior
|
|
svlogd - standard behavior
|
|
tcpsvd, udpsvd - standard behavior
|
|
tftpd - standard behavior
|
|
|
|
|
|
Non-daemons (seems to be use syslog for a good reason):
|
|
|
|
networking/nameif.c: logmode |= LOGMODE_SYSLOG;
|
|
loginutils/chpasswd.c: logmode = LOGMODE_BOTH;
|
|
loginutils/chpasswd.c: logmode = LOGMODE_STDIO;
|
|
loginutils/getty.c: logmode = LOGMODE_BOTH;
|
|
loginutils/getty.c: logmode = LOGMODE_NONE;
|
|
loginutils/passwd.c: logmode = LOGMODE_STDIO;
|
|
loginutils/passwd.c: logmode = LOGMODE_BOTH;
|
|
loginutils/sulogin.c: logmode = LOGMODE_SYSLOG; (used if stdio isn't a tty)
|
|
loginutils/sulogin.c: logmode = LOGMODE_BOTH;
|
|
util-linux/mount.c: logmode = LOGMODE_SYSLOG; (used in a backgrounded NFS mount helper)
|