1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
#!/bin/sh -e
### BEGIN INIT INFO
# Provides: mons
# Required-Start: $local_fs $network
# Required-Stop:
# Default-Start: S 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: mon: monitoring the availability of services
### END INIT INFO
# These specify the user and group that mon runs as. You can use group
# daemon instead of group shadow if you want to limit its permissions,
# but then it won't be able to authenticate users against the shadow
# password file.
user=daemon
group=shadow
# Don't let group shadow write to my files.
umask 22
# This specifies mon's configuration file. If this file name ends with
# .m4 it's preprocssed with m4. The shell code after the assignment
# causes this script to use a .m4 version if it exists.
cfg=/etc/mon/mon.cf
[ -f $cfg.m4 ] && cfg=$cfg.m4
# These are the args which are passed to mon. -f tells it to fork and
# run as a daemon, -c just makes use of the config file setting from
# above (notably, so that a .m4 version is picked up).
args="-f -c $cfg"
# You're less likely to need to change any of the others.
script=`basename "$0"`
daemon=/usr/sbin/mon
pid=/var/run/mon/mon.pid
desc='monitor daemon'
name=mon
# Add system dirs for start-stop-daemon.
PATH=$PATH:/sbin:/usr/sbin
[ -f $daemon -a -f $cfg ] || exit 0
# Don't bother if the user hasn't configured the package, there is no
# default configuration but there is a default config file (which just
# contains comments).
egrep -v '^[ ]*$|^#' $cfg >/dev/null || exit 0
warn() {
echo "$script:" "$@" >&2
}
die() {
warn "$@"
exit 1
}
usage() {
[ $# = 0 ] || warn "$@"
warn "usage: \`$script <action>'"
warn "valid actions: start stop restart reload force-reload"
exit 1
}
# I originally used su to start the daemon as user daemon, but ran into
# trouble with the differing requirements of su and secure-su. The GNU
# getopt's troublsome behavior of looking for switches anywhere on the
# command line requires that one use -- if one wants to pass switches
# to the shell, but secure-su doesn't allow the --. One could set
# POSIXLY_CORRECT to prevent this poor getopt_long() behavior, but then
# the sub-command would have that in its environment. In disgust I
# gave up and switched to using Perl.
daemon_run() {
perl -we '
$user = shift;
$group = shift;
defined($uid = getpwnam $user)
or die "Cannot find uid for user $user\n";
defined($gid = getgrnam $group)
or die "Cannot find gid for group $group\n";
$( = $gid;
$) = "$gid $gid";
if ($( ne "$gid $gid" || $) ne "$gid $gid") {
die "Error setting group ids, real/effective is now $(/$)\n";
}
$< = $uid;
$> = $uid;
if ($> != $uid || $< != $uid) {
die "Error setting user ids, real/effective is now $</$>\n";
}
exec @ARGV or die "Error running $ARGV[0]: $!\n";
' "$user" "$group" "$@" ||
die "return $? setting ids and running:" "$@"
}
[ $# = 1 ] || usage "wrong number of args (got $# expected 1), args are:" "$@"
action=$1
set -- --pidfile $pid --startas $daemon -- $args
stop_mon() {
running_mon_pid=`cat $pid 2>/dev/null` || true
daemon_is_running() {
[ -f $pid -a /proc/"$running_mon_pid"/exe -ef /usr/bin/perl ]
}
start-stop-daemon --stop --oknodo --quiet "$@"
daemon_is_running || return 0
sleep 1
daemon_is_running || return 0
# Wait for the daemon to exit before continuing, so that a subsequent
# start doesn't fail if it happens too soon.
echo -n " [waiting for mon (pid $running_mon_pid) to exit..."
n=0
while daemon_is_running
do
n=`expr $n + 1`
[ $n = 60 ] && die "giving up, mon still hasn't exited"
echo -n .
sleep 1
done
echo -n "]"
}
case x-$action in
x-start)
echo -n "Starting $desc: $name"
daemon_run start-stop-daemon --start "$@"
echo .
;;
x-stop)
echo -n "Stopping $desc: $name"
stop_mon "$@"
echo .
;;
x-restart)
echo -n "Restarting $desc: $name"
stop_mon "$@"
daemon_run start-stop-daemon --start "$@"
echo .
;;
x-reload | x-force-reload)
echo "Reloading $desc configuration files."
start-stop-daemon --stop --signal 1 "$@"
;;
*)
usage "invalid action \`$action'"
;;
esac
exit 0
|
