blob: 4041735826f16b4aad0a41008018448083668b7a (
plain) (
blame)
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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
#!/system/xbin/bash
#
# Copyright (C) 2016-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
#
set -e -o pipefail
shopt -s extglob
export LC_ALL=C
SELF="$(readlink -f "${BASH_SOURCE[0]}")"
export PATH="${SELF%/*}:$PATH"
WG_CONFIG=""
INTERFACE=""
NETID=0
ADDRESSES=( )
MTU=""
DNS=""
CONFIG_FILE=""
PROGRAM="${0##*/}"
ARGS=( "$@" )
parse_options() {
local interface_section=0 line key value
CONFIG_FILE="$1"
[[ $CONFIG_FILE =~ ^[a-zA-Z0-9_=+.-]{1,16}$ ]] && CONFIG_FILE="/data/misc/wireguard/$CONFIG_FILE.conf"
[[ -e $CONFIG_FILE ]] || die "\`$CONFIG_FILE' does not exist"
[[ $CONFIG_FILE =~ /?([a-zA-Z0-9_=+.-]{1,16})\.conf$ ]] || die "The config file must be a valid interface name, followed by .conf"
((($(stat -c '%#a' "$CONFIG_FILE") & 0007) == 0)) || echo "Warning: \`$CONFIG_FILE' is world accessible" >&2
INTERFACE="${BASH_REMATCH[1]}"
shopt -s nocasematch
while read -r line || [[ -n $line ]]; do
key="${line%%=*}"; key="${key##*( )}"; key="${key%%*( )}"
value="${line#*=}"; value="${value##*( )}"; value="${value%%*( )}"
[[ $key == "["* ]] && interface_section=0
[[ $key == "[Interface]" ]] && interface_section=1
if [[ $interface_section -eq 1 ]]; then
case "$key" in
Address) ADDRESSES+=( ${value//,/ } ); continue ;;
MTU) MTU="$value"; continue ;;
DNS) DNS="$value"; continue ;;
esac
fi
WG_CONFIG+="$line"$'\n'
done < "$CONFIG_FILE"
shopt -u nocasematch
}
cmd() {
echo "[#] $*" >&2
"$@"
}
cndc() {
local out="$(cmd ndc "$@")"
[[ $out == *200\ 0* ]] || { echo "$out"; return 1; }
}
die() {
echo "$PROGRAM: $*" >&2
exit 1
}
auto_su() {
[[ $UID == 0 ]] || exec su -p -c "'$SELF' ${ARGS[*]}"
}
add_if() {
cmd ip link add "$INTERFACE" type wireguard
}
del_if() {
cmd ip link del "$INTERFACE"
[[ $(ip rule show) =~ 0xc([0-9a-f]+)/0xcffff\ lookup\ $INTERFACE ]] && cndc network destroy $(( 0x${BASH_REMATCH[1]} ));
}
up_if() {
while [[ $NETID -lt 4096 ]]; do
NETID="$RANDOM"
done
cmd wg set "$INTERFACE" fwmark 0x20000
cndc interface setcfg "$INTERFACE" up
cndc network create "$NETID" vpn 1 1
cndc network interface add "$NETID" "$INTERFACE"
cndc network users add "$NETID" 0-99999
}
set_dns() {
cndc resolver setnetdns "$NETID" "" "$1"
}
add_addr() {
if [[ $1 == *:* ]]; then
cndc interface ipv6 "$INTERFACE" enable
cmd ip -6 addr add "$1" dev "$INTERFACE"
else
local ip="${1%%/*}" mask=32
[[ $1 == */* ]] && mask="${1##*/}"
cndc interface setcfg "$INTERFACE" "$ip" "$mask"
fi
}
set_mtu() {
local mtu=0 endpoint output
if [[ -n $MTU ]]; then
cndc interface setmtu "$INTERFACE" "$MTU"
return
fi
while read -r _ endpoint; do
[[ $endpoint =~ ^\[?([a-z0-9:.]+)\]?:[0-9]+$ ]] || continue
output="$(ip route get "${BASH_REMATCH[1]}" || true)"
[[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) ) ) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}"
done < <(wg show "$INTERFACE" endpoints)
if [[ $mtu -eq 0 ]]; then
read -r output < <(ip route show default || true) || true
[[ ( $output =~ mtu\ ([0-9]+) || ( $output =~ dev\ ([^ ]+) && $(ip link show dev "${BASH_REMATCH[1]}") =~ mtu\ ([0-9]+) ) ) && ${BASH_REMATCH[1]} -gt $mtu ]] && mtu="${BASH_REMATCH[1]}"
fi
[[ $mtu -gt 0 ]] || mtu=1500
cndc interface setmtu "$INTERFACE" $(( mtu - 80 ))
}
add_route() {
cndc network route add "$NETID" "$INTERFACE" "$1"
}
set_config() {
cmd wg setconf "$INTERFACE" <(echo "$WG_CONFIG")
}
cmd_usage() {
cat >&2 <<-_EOF
Usage: $PROGRAM [ up | down ] [ CONFIG_FILE | INTERFACE ]
CONFIG_FILE is a configuration file, whose filename is the interface name
followed by \`.conf'. Otherwise, INTERFACE is an interface name, with
configuration found at /data/misc/wireguard/INTERFACE.conf. It is to be readable
by wg(8)'s \`setconf' sub-command, with the exception of the following additions
to the [Interface] section, which are handled by $PROGRAM:
- Address: may be specified one or more times and contains one or more
IP addresses (with an optional CIDR mask) to be set for the interface.
- MTU: an optional MTU for the interface; if unspecified, auto-calculated.
- DNS: an optional DNS server to use while the device is up.
See wg-quick(8) for more info and examples.
_EOF
}
cmd_up() {
local i
[[ -z $(ip link show dev "$INTERFACE" 2>/dev/null) ]] || die "\`$INTERFACE' already exists"
trap 'del_if; exit' INT TERM EXIT
add_if
set_config
set_mtu
for i in "${ADDRESSES[@]}"; do
add_addr "$i"
done
up_if
[[ -z $DNS ]] || set_dns "$DNS"
for i in $(while read -r _ i; do for i in $i; do [[ $i =~ ^[0-9a-z:.]+/[0-9]+$ ]] && echo "$i"; done; done < <(wg show "$INTERFACE" allowed-ips) | sort -nr -k 2 -t /); do
[[ $(ip route get "$i" 2>/dev/null) == *dev\ $INTERFACE\ * ]] || add_route "$i"
done
trap - INT TERM EXIT
}
cmd_down() {
[[ -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] || die "\`$INTERFACE' is not a WireGuard interface"
del_if
}
if [[ $# -eq 1 && ( $1 == --help || $1 == -h || $1 == help ) ]]; then
cmd_usage
elif [[ $# -eq 2 && $1 == up ]]; then
auto_su
parse_options "$2"
cmd_up
elif [[ $# -eq 2 && $1 == down ]]; then
auto_su
parse_options "$2"
cmd_down
else
cmd_usage
exit 1
fi
exit 0
|
