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
|
#!/bin/bash -x
#============================================================================
# Default Xen network start/stop script when using NAT.
# Xend calls a network script when it starts.
# The script name to use is defined in ${XEN_CONFIG_DIR}/xend-config.sxp
# in the network-script field.
#
# Usage:
#
# network-nat (start|stop|status) {VAR=VAL}*
#
# Vars:
#
# netdev The gateway interface (default eth0).
# antispoof Whether to use iptables to prevent spoofing (default no).
# dhcp Whether to alter the local DHCP configuration (default no).
#
#============================================================================
dir=$(dirname "$0")
. "$dir/hotplugpath.sh"
. "$dir/xen-script-common.sh"
. "$dir/xen-network-common.sh"
findCommand "$@"
evalVariables "$@"
netdev=${netdev:-eth0}
# antispoofing not yet implemented
antispoof=${antispoof:-no}
# turn on dhcp feature by default if dhcpd is installed
if [ -f /etc/dhcpd.conf ]
then
dhcp=${dhcp:-yes}
else
dhcp=${dhcp:-no}
fi
if [ "$dhcp" != 'no' ]
then
dhcpd_conf_file=$(find_dhcpd_conf_file)
dhcpd_init_file=$(find_dhcpd_init_file)
if [ -z "$dhcpd_conf_file" ] || [ -z "$dhcpd_init_file" ]
then
echo 'Failed to find dhcpd configuration or init file.' >&2
exit 1
fi
fi
domain_name=`cat /etc/resolv.conf | grep -v "#" | grep -E 'search|domain' -i | tail -n 1 | awk '{ print $2 }'`
nameserver=`cat /etc/resolv.conf | grep -v "#" | grep "nameserver" -i -m 1 | awk '{ print $2 }'`
function dhcp_start()
{
if ! grep -q "subnet 10.0.0.0" "$dhcpd_conf_file"
then
echo >>"$dhcpd_conf_file" "subnet 10.0.0.0 netmask 255.255.0.0 {\
option domain-name \"$domain_name\";\
option domain-name-servers $nameserver; }"
fi
"$dhcpd_init_file" restart
}
function dhcp_stop()
{
local tmpfile=$(mktemp)
grep -v "subnet 10.0.0.0" "$dhcpd_conf_file" >"$tmpfile"
if diff "$tmpfile" "$dhcpd_conf_file" >&/dev/null
then
rm "$tmpfile"
else
mv "$tmpfile" "$dhcpd_conf_file"
fi
"$dhcpd_init_file" restart
}
op_start() {
echo 1 >/proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o ${netdev} -j MASQUERADE
[ "$dhcp" != 'no' ] && dhcp_start
}
op_stop() {
[ "$dhcp" != 'no' ] && dhcp_stop
iptables -t nat -D POSTROUTING -o ${netdev} -j MASQUERADE
}
show_status() {
echo '============================================================'
ifconfig
echo ' '
ip route list
echo ' '
route -n
echo '============================================================'
}
case "$command" in
start)
op_start
;;
stop)
op_stop
;;
status)
show_status
;;
*)
echo "Unknown command: $command" >&2
echo 'Valid commands are: start, stop, status' >&2
exit 1
esac
|
