network config: ignore nonexistant interfaces
[openwrt/svn-archive/archive.git] / package / base-files / files / lib / network / config.sh
1 #!/bin/sh
2 # Copyright (C) 2006 OpenWrt.org
3
4 # DEBUG="echo"
5
6 find_config() {
7 local iftype device iface ifaces ifn
8 for ifn in $interfaces; do
9 config_get iftype "$ifn" type
10 config_get iface "$ifn" ifname
11 case "$iftype" in
12 bridge) config_get ifaces "$ifn" ifnames;;
13 esac
14 config_get device "$ifn" device
15 for ifc in $device $iface $ifaces; do
16 [ "$ifc" = "$1" ] && {
17 echo "$ifn"
18 return 0
19 }
20 done
21 done
22
23 return 1;
24 }
25
26 scan_interfaces() {
27 local cfgfile="$1"
28 local mode iftype iface ifname device
29 interfaces=
30 config_cb() {
31 case "$1" in
32 interface)
33 config_set "$2" auto 1
34 ;;
35 esac
36 config_get iftype "$CONFIG_SECTION" TYPE
37 case "$iftype" in
38 interface)
39 config_get proto "$CONFIG_SECTION" proto
40 append interfaces "$CONFIG_SECTION"
41 config_get iftype "$CONFIG_SECTION" type
42 config_get ifname "$CONFIG_SECTION" ifname
43 config_set "$CONFIG_SECTION" device "$ifname"
44 case "$iftype" in
45 bridge)
46 config_set "$CONFIG_SECTION" ifnames "$ifname"
47 config_set "$CONFIG_SECTION" ifname br-"$CONFIG_SECTION"
48 ;;
49 esac
50 ( type "scan_$proto" ) >/dev/null 2>/dev/null && eval "scan_$proto '$CONFIG_SECTION'"
51 ;;
52 esac
53 }
54 config_load "${cfgfile:-network}"
55 }
56
57 add_vlan() {
58 local vif="${1%\.*}"
59
60 [ "$1" = "$vif" ] || ifconfig "$1" >/dev/null 2>/dev/null || {
61 ifconfig "$vif" up 2>/dev/null >/dev/null || add_vlan "$vif"
62 $DEBUG vconfig add "$vif" "${1##*\.}"
63 }
64 }
65
66 # Create the interface, if necessary.
67 # Return status 0 indicates that the setup_interface() call should continue
68 # Return status 1 means that everything is set up already.
69
70 prepare_interface() {
71 local iface="$1"
72 local config="$2"
73
74 # if we're called for the bridge interface itself, don't bother trying
75 # to create any interfaces here. The scripts have already done that, otherwise
76 # the bridge interface wouldn't exist.
77 [ "$iface" = "br-$config" ] && return 0;
78
79 ifconfig "$iface" 2>/dev/null >/dev/null && {
80 # make sure the interface is removed from any existing bridge and brought down
81 ifconfig "$iface" down
82 unbridge "$iface"
83 }
84
85 # Setup VLAN interfaces
86 add_vlan "$iface"
87 ifconfig "$iface" 2>/dev/null >/dev/null || return 0
88
89 # Setup bridging
90 config_get iftype "$config" type
91 case "$iftype" in
92 bridge)
93 [ -x /usr/sbin/brctl ] && {
94 ifconfig "$iface" up 2>/dev/null >/dev/null
95 ifconfig "br-$config" 2>/dev/null >/dev/null && {
96 $DEBUG brctl addif "br-$config" "$iface"
97 # Bridge existed already. No further processing necesary
98 } || {
99 $DEBUG brctl addbr "br-$config"
100 $DEBUG brctl setfd "br-$config" 0
101 $DEBUG brctl addif "br-$config" "$iface"
102 # Creating the bridge here will have triggered a hotplug event, which will
103 # result in another setup_interface() call, so we simply stop processing
104 # the current event at this point.
105 }
106 return 1
107 }
108 ;;
109 esac
110 return 0
111 }
112
113 setup_interface() {
114 local iface="$1"
115 local config="$2"
116 local proto
117 local macaddr
118
119 [ -n "$config" ] || {
120 config=$(find_config "$iface")
121 [ "$?" = 0 ] || return 1
122 }
123 proto="${3:-$(config_get "$config" proto)}"
124
125 prepare_interface "$iface" "$config" || return 0
126
127 [ "$iface" = "br-$config" ] && {
128 # need to bring up the bridge and wait a second for
129 # it to switch to the 'forwarding' state, otherwise
130 # it will lose its routes...
131 ifconfig "$iface" up
132 sleep 1
133 }
134
135 # Interface settings
136 config_get mtu "$config" mtu
137 config_get macaddr "$config" macaddr
138 $DEBUG ifconfig "$iface" ${macaddr:+hw ether "$macaddr"} ${mtu:+mtu $mtu} up
139
140 pidfile="/var/run/$iface.pid"
141 case "$proto" in
142 static)
143 config_get ipaddr "$config" ipaddr
144 config_get netmask "$config" netmask
145 [ -z "$ipaddr" -o -z "$netmask" ] && return 1
146
147 config_get ip6addr "$config" ip6addr
148 config_get gateway "$config" gateway
149 config_get dns "$config" dns
150 config_get bcast "$config" broadcast
151
152 [ -z "$ipaddr" ] || $DEBUG ifconfig "$iface" "$ipaddr" netmask "$netmask"
153 [ -z "$ip6addr" ] || $DEBUG ifconfig "$iface" inet6 add "$ip6addr"
154 [ -z "$gateway" ] || $DEBUG route add default gw "$gateway"
155 [ -z "$bcast" ] || $DEBUG ifconfig "$iface" broadcast "$bcast"
156 [ -z "$dns" -o -f /tmp/resolv.conf.auto ] || {
157 for ns in $dns; do
158 echo "nameserver $ns" >> /tmp/resolv.conf.auto
159 done
160 }
161
162 env -i ACTION="ifup" INTERFACE="$config" DEVICE="$iface" PROTO=static /sbin/hotplug-call "iface" &
163 ;;
164 dhcp)
165 # prevent udhcpc from starting more than once
166 lock "/var/lock/dhcp-$iface"
167 pid="$(cat "$pidfile" 2>/dev/null)"
168 [ -d "/proc/$pid" ] && grep udhcpc "/proc/${pid}/cmdline" >/dev/null 2>/dev/null && {
169 lock -u "/var/lock/dhcp-$iface"
170 return 0
171 }
172
173 config_get ipaddr "$config" ipaddr
174 config_get netmask "$config" netmask
175 config_get hostname "$config" hostname
176 config_get proto1 "$config" proto
177
178 [ -z "$ipaddr" ] || \
179 $DEBUG ifconfig "$iface" "$ipaddr" ${netmask:+netmask "$netmask"}
180
181 # don't stay running in background if dhcp is not the main proto on the interface (e.g. when using pptp)
182 [ "$proto1" != "$proto" ] && dhcpopts="-n -q"
183 $DEBUG eval udhcpc -t 0 -i "$iface" ${ipaddr:+-r $ipaddr} ${hostname:+-H $hostname} -b -p "$pidfile" ${dhcpopts:- -R &}
184 lock -u "/var/lock/dhcp-$iface"
185 ;;
186 *)
187 if ( eval "type setup_interface_$proto" ) >/dev/null 2>/dev/null; then
188 eval "setup_interface_$proto '$iface' '$config' '$proto'"
189 else
190 echo "Interface type $proto not supported."
191 return 1
192 fi
193 ;;
194 esac
195 }
196
197 unbridge() {
198 local dev="$1"
199 local brdev
200
201 [ -x /usr/sbin/brctl ] || return 0
202 brctl show | grep "$dev" >/dev/null && {
203 # interface is still part of a bridge, correct that
204
205 for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
206 brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
207 done
208 }
209 }