scripts/qemustart: no network by default and enable with -n
[openwrt/openwrt.git] / scripts / qemustart
1 #!/usr/bin/env bash
2
3 SELF="$0"
4
5 # Linux bridge for connecting lan and wan network of guest machines
6 BR_LAN="${BR_LAN:-br-lan}"
7 BR_WAN="${BR_WAN:-br-wan}"
8
9 # Host network interface providing internet access for guest machines
10 IF_INET="${IF_INET:-eth0}"
11
12 # qemu-bridge-helper does two things here
13 #
14 # - create tap interface
15 # - add the tap interface to bridge
16 #
17 # as such it requires CAP_NET_ADMIN to do its job. It will be convenient to
18 # have it as a root setuid program. Be aware of the security risks implied
19 #
20 # the helper has an acl list which defaults to deny all bridge. we need to add
21 # $BR_LAN and $BR_WAN to its allow list
22 #
23 # # sudo vim /etc/qemu/bridge.conf
24 # allow br-lan
25 # allow br-wan
26 #
27 # Other allowed directives can be 'allow all', 'deny all', 'include xxx', See
28 # qemu-bridge-helper.c of qemu source code for details.
29 #
30 # The helper can be provided by package qemu-system-common on debian, or
31 # qemu-kvm-common on rhel
32 #
33 HELPER="${HELPER:-/usr/libexec/qemu-bridge-helper}"
34
35 ### end of global settings
36
37 __errmsg() {
38 echo "$*" >&2
39 }
40
41 do_setup() {
42 # setup bridge for LAN network
43 sudo ip link add dev "$BR_LAN" type bridge
44 sudo ip link set dev "$BR_LAN" up
45 sudo ip addr add 192.168.1.3/24 dev "$BR_LAN"
46
47 # setup bridge for WAN network
48 #
49 # minimal dnsmasq config for configuring guest wan network with dhcp
50 #
51 # # sudo apt-get install dnsmasq
52 # # sudo vi /etc/dnsmasq.conf
53 # interface=br-wan
54 # dhcp-range=192.168.7.50,192.168.7.150,255.255.255.0,30m
55 #
56 sudo ip link add dev "$BR_WAN" type bridge
57 sudo ip link set dev "$BR_WAN" up
58 sudo ip addr add 192.168.7.1/24 dev "$BR_WAN"
59
60 # guest internet access
61 sudo sysctl -w "net.ipv4.ip_forward=1"
62 sudo sysctl -w "net.ipv4.conf.$BR_WAN.proxy_arp=1"
63 while sudo iptables -t nat -D POSTROUTING -o "$IF_INET" -j MASQUERADE 2>/dev/null; do true; done
64 sudo iptables -t nat -A POSTROUTING -o "$IF_INET" -j MASQUERADE
65 }
66
67 check_setup_() {
68 ip link show "$BR_LAN" >/dev/null || return 1
69 ip link show "$BR_WAN" >/dev/null || return 1
70 [ -x "$HELPER" ] || {
71 __errmsg "helper $HELPER is not an executable"
72 return 1
73 }
74 }
75
76 check_setup() {
77 [ -n "$o_network" ] || return 0
78 check_setup_ || {
79 __errmsg "please check the script content to see the environment requirement"
80 return 1
81 }
82 }
83 #do_setup; check_setup; exit $?
84
85 usage() {
86 cat >&2 <<EOF
87 Usage: $SELF [-h|--help]
88 $SELF <target>
89 [<subtarget> [<extra-qemu-options>]]
90 [--kernel <kernel>]
91 [--rootfs <rootfs>]
92 [--machine <machine>]
93 [-n|--network]
94
95 <subtarget> will default to "generic" and must be specified if
96 <extra-qemu-options> are present
97
98 e.g. <subtarget> for malta can be le, be, le64, be64, le-glibc, le64-glibc, etc
99
100 <kernel>, <rootfs> can be required or optional arguments to qemu depending on
101 the actual <target> in use. They will default to files under bin/targets/
102
103 Examples
104
105 $SELF x86 64
106 $SELF x86 64 --machine q35,accel=kvm -device virtio-balloon-pci
107 $SELF x86 64 -incoming tcp:0:4444
108 $SELF x86 64-glibc
109 $SELF malta be -m 64
110 $SELF malta le64
111 $SELF malta be-glibc
112 $SELF armvirt 32 \\
113 --machine virt,highmem=off \\
114 --kernel bin/targets/armvirt/32/openwrt-armvirt-32-zImage \\
115 --rootfs bin/targets/armvirt/32/openwrt-armvirt-32-root.ext4
116 EOF
117 }
118
119 rand_mac() {
120 hexdump -n 3 -e '"52:54:00" 3/1 ":%02x"' /dev/urandom
121 }
122
123 parse_args() {
124 o_network=
125 o_qemu_extra=()
126 while [ "$#" -gt 0 ]; do
127 case "$1" in
128 --kernel) o_kernel="$2"; shift 2 ;;
129 --rootfs) o_rootfs="$2"; shift 2 ;;
130 --machine|-machine|-M) o_mach="$2"; shift 2 ;;
131 --network|-n) o_network=1; shift ;;
132 --help|-h)
133 usage
134 exit 0
135 ;;
136 *)
137 if [ -z "$o_target" ]; then
138 o_target="$1"
139 elif [ -z "$o_subtarget" ]; then
140 o_subtarget="$1"
141 else
142 o_qemu_extra+=("$1")
143 fi
144 shift
145 ;;
146 esac
147 done
148
149 MAC_LAN="$(rand_mac)"
150 MAC_WAN="$(rand_mac)"
151 [ -n "$o_target" ] || {
152 usage
153 return 1
154 }
155 [ -n "$o_subtarget" ] || o_subtarget="generic"
156 o_bindir="bin/targets/$o_target/$o_subtarget"
157 }
158
159 start_qemu_armvirt() {
160 local kernel="$o_kernel"
161 local rootfs="$o_rootfs"
162 local mach="${o_mach:-virt}"
163 local cpu
164 local qemu_exe
165
166 case "${o_subtarget%-*}" in
167 32)
168 qemu_exe="qemu-system-arm"
169 cpu="cortex-a15"
170 [ -n "$kernel" ] || kernel="$o_bindir/openwrt-$o_target-${o_subtarget%-*}-zImage-initramfs"
171 ;;
172 64)
173 qemu_exe="qemu-system-aarch64"
174 cpu="cortex-a57"
175 [ -n "$kernel" ] || kernel="$o_bindir/openwrt-$o_target-${o_subtarget%-*}-Image-initramfs"
176 ;;
177 *)
178 __errmsg "target $o_target: unknown subtarget $o_subtarget"
179 return 1
180 ;;
181 esac
182 [ -z "$rootfs" ] || {
183 if [ ! -f "$rootfs" -a -s "$rootfs.gz" ]; then
184 gunzip "$rootfs.gz"
185 fi
186 o_qemu_extra+=( \
187 "-drive" "file=$rootfs,format=raw,if=virtio" \
188 "-append" "root=/dev/vda rootwait" \
189 )
190 }
191
192 [ -z "$o_network" ] || {
193 o_qemu_extra+=( \
194 "-netdev" "bridge,id=lan,br=$BR_LAN,helper=$HELPER" \
195 "-device" "virtio-net-pci,id=devlan,netdev=lan,mac=$MAC_LAN" \
196 "-netdev" "bridge,id=wan,br=$BR_WAN,helper=$HELPER" "-device" \
197 "virtio-net-pci,id=devwan,netdev=wan,mac=$MAC_WAN" \
198 )
199 }
200
201 "$qemu_exe" -machine "$mach" -cpu "$cpu" -nographic \
202 -kernel "$kernel" \
203 "${o_qemu_extra[@]}"
204 }
205
206 start_qemu_malta() {
207 local is64
208 local isel
209 local qemu_exe
210 local rootfs="$o_rootfs"
211 local kernel="$o_kernel"
212 local mach="${o_mach:-malta}"
213
214 # o_subtarget can be le, be, le64, be64, le-glibc, le64-glibc, etc..
215 is64="$(echo $o_subtarget | grep -o 64)"
216 [ "$(echo "$o_subtarget" | grep -o '^..')" = "le" ] && isel="el"
217 qemu_exe="qemu-system-mips$is64$isel"
218
219 [ -n "$kernel" ] || kernel="$o_bindir/openwrt-malta-${o_subtarget%-*}-vmlinux-initramfs.elf"
220
221 [ -z "$rootfs" ] || {
222 if [ ! -f "$rootfs" -a -s "$rootfs.gz" ]; then
223 gunzip "$rootfs.gz"
224 fi
225 o_qemu_extra+=( \
226 "-drive" "file=$rootfs,format=raw" \
227 "-append" "root=/dev/sda rootwait" \
228 )
229 }
230
231 # NOTE: order of wan, lan -device arguments matters as it will affect which
232 # one will be actually used as the wan, lan network interface inside the
233 # guest machine
234 [ -z "$o_network" ] || {
235 o_qemu_extra+=( \
236 "-netdev" "bridge,id=wan,br=$BR_WAN,helper=$HELPER" "-device" \
237 "virtio-net-pci,id=devwan,netdev=wan,mac=$MAC_WAN" \
238 "-netdev" "bridge,id=lan,br=$BR_LAN,helper=$HELPER" \
239 "-device" "virtio-net-pci,id=devlan,netdev=lan,mac=$MAC_LAN" \
240 )
241 }
242
243 "$qemu_exe" -machine "$mach" -nographic \
244 -kernel "$kernel" \
245 "${o_qemu_extra[@]}"
246 }
247
248 start_qemu_x86() {
249 local qemu_exe
250 local kernel="$o_kernel"
251 local rootfs="$o_rootfs"
252 local mach="${o_mach:-pc}"
253
254 [ -n "$rootfs" ] || {
255 rootfs="$o_bindir/openwrt-$o_target-${o_subtarget%-*}-combined-ext4.img"
256 if [ ! -f "$rootfs" -a -s "$rootfs.gz" ]; then
257 gunzip "$rootfs.gz"
258 fi
259 }
260 #
261 # generic: 32-bit, pentium4 (CONFIG_MPENTIUM4), kvm guest, virtio
262 # legacy: 32-bit, i486 (CONFIG_M486)
263 # 64: 64-bit, kvm guest, virtio
264 #
265 case "${o_subtarget%-*}" in
266 legacy) qemu_exe="qemu-system-i386" ;;
267 generic|64) qemu_exe="qemu-system-x86_64" ;;
268 *)
269 __errmsg "target $o_target: unknown subtarget $o_subtarget"
270 return 1
271 ;;
272 esac
273
274 [ -n "$kernel" ] && {
275 o_qemu_extra+=( \
276 "-kernel" "$kernel" \
277 "-append" "root=/dev/vda console=ttyS0 rootwait" \
278 )
279 }
280
281 [ -z "$o_network" ] || {
282 o_qemu_extra+=( \
283 "-netdev" "bridge,id=lan,br=$BR_LAN,helper=$HELPER" \
284 "-device" "virtio-net-pci,id=devlan,netdev=lan,mac=$MAC_LAN" \
285 "-netdev" "bridge,id=wan,br=$BR_WAN,helper=$HELPER" "-device" \
286 "virtio-net-pci,id=devwan,netdev=wan,mac=$MAC_WAN" \
287 )
288 }
289
290 case "${o_subtarget%-*}" in
291 legacy)
292 # use IDE (PATA) disk instead of AHCI (SATA). Refer to link
293 # [1] for related discussions
294 #
295 # To use AHCI interface
296 #
297 # -device ich9-ahci,id=ahci \
298 # -device ide-drive,drive=drv0,bus=ahci.0 \
299 # -drive "file=$rootfs,format=raw,id=drv0,if=none" \
300 #
301 # [1] https://dev.openwrt.org/ticket/17947
302 "$qemu_exe" -machine "$mach" -nographic \
303 -device ide-drive,drive=drv0 \
304 -drive "file=$rootfs,format=raw,id=drv0,if=none" \
305 "${o_qemu_extra[@]}"
306 ;;
307 generic|64)
308 "$qemu_exe" -machine "$mach" -nographic \
309 -drive "file=$rootfs,format=raw,if=virtio" \
310 "${o_qemu_extra[@]}"
311 ;;
312 esac
313 }
314
315 start_qemu() {
316 case "$o_target" in
317 armvirt) start_qemu_armvirt ;;
318 malta) start_qemu_malta ;;
319 x86) start_qemu_x86 ;;
320 *)
321 __errmsg "target $o_target is not supported yet"
322 return 1
323 ;;
324 esac
325 }
326
327 parse_args "$@" \
328 && check_setup \
329 && start_qemu