OpenWrt – Blame information for rev 4

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4 office 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 check_setup_ || {
78 __errmsg "please check the script content to see the environment requirement"
79 return 1
80 }
81 }
82 #do_setup; check_setup; exit $?
83  
84 usage() {
85 cat >&2 <<EOF
86 Usage: $SELF [-h|--help]
87 $SELF <target>
88 [<subtarget> [<extra-qemu-options>]]
89 [--kernel <kernel>]
90 [--rootfs <rootfs>]
91  
92 <subtarget> will default to "generic" and must be specified if
93 <extra-qemu-options> are present
94  
95 e.g. <subtarget> for malta can be le, be, le64, be64, le-glibc, le64-glibc, etc
96  
97 <kernel>, <rootfs> can be required or optional arguments to qemu depending on
98 the actual <target> in use. They will default to files under bin/targets/
99  
100 Examples
101  
102 $SELF x86 64
103 $SELF x86 64 -enable-kvm -device virtio-balloon-pci
104 $SELF x86 64 -incoming tcp:0:4444
105 $SELF x86 64-glibc
106 $SELF malta be -m 64
107 $SELF malta le64
108 $SELF malta be-glibc
109 $SELF armvirt 32 \\
110 --kernel bin/targets/armvirt/32/openwrt-armvirt-32-zImage \\
111 --rootfs bin/targets/armvirt/32/openwrt-armvirt-32-root.ext4
112 EOF
113 }
114  
115 rand_mac() {
116 hexdump -n 3 -e '"52:54:00:" 2/1 "%02x:" 1/1 "%02x"' /dev/urandom
117 }
118  
119 parse_args() {
120 o_qemu_extra=()
121 while [ "$#" -gt 0 ]; do
122 case "$1" in
123 --kernel) o_kernel="$2"; shift 2 ;;
124 --rootfs) o_rootfs="$2"; shift 2 ;;
125 --help|-h)
126 usage
127 exit 0
128 ;;
129 *)
130 if [ -z "$o_target" ]; then
131 o_target="$1"
132 elif [ -z "$o_subtarget" ]; then
133 o_subtarget="$1"
134 else
135 o_qemu_extra+=("$1")
136 fi
137 shift
138 ;;
139 esac
140 done
141  
142 MAC_LAN="$(rand_mac)"
143 MAC_WAN="$(rand_mac)"
144 [ -n "$o_target" ] || {
145 usage
146 return 1
147 }
148 [ -n "$o_subtarget" ] || o_subtarget="generic"
149 o_bindir="bin/targets/$o_target/$o_subtarget"
150 }
151  
152 start_qemu_armvirt() {
153 local kernel="$o_kernel"
154 local rootfs="$o_rootfs"
155 local cpu
156 local qemu_exe
157  
158 case "${o_subtarget%-*}" in
159 32)
160 qemu_exe="qemu-system-arm"
161 cpu="cortex-a15"
162 [ -n "$kernel" ] || kernel="$o_bindir/openwrt-$o_target-${o_subtarget%-*}-zImage-initramfs"
163 ;;
164 64)
165 qemu_exe="qemu-system-aarch64"
166 cpu="cortex-a57"
167 [ -n "$kernel" ] || kernel="$o_bindir/openwrt-$o_target-${o_subtarget%-*}-Image-initramfs"
168 ;;
169 *)
170 __errmsg "target $o_target: unknown subtarget $o_subtarget"
171 return 1
172 ;;
173 esac
174 [ -z "$rootfs" ] || {
175 if [ ! -f "$rootfs" -a -s "$rootfs.gz" ]; then
176 gunzip "$rootfs.gz"
177 fi
178 o_qemu_extra+=( \
179 "-drive" "file=$rootfs,format=raw,if=virtio" \
180 "-append" "root=/dev/vda rootwait" \
181 )
182 }
183  
184 "$qemu_exe" -machine virt -cpu "$cpu" -nographic \
185 -netdev bridge,id=lan,br="$BR_LAN,helper=$HELPER" -device virtio-net-pci,id=devlan,netdev=lan,mac="$MAC_LAN" \
186 -netdev bridge,id=wan,br="$BR_WAN,helper=$HELPER" -device virtio-net-pci,id=devwan,netdev=wan,mac="$MAC_WAN" \
187 -kernel "$kernel" \
188 "${o_qemu_extra[@]}"
189 }
190  
191 start_qemu_malta() {
192 local is64
193 local isel
194 local qemu_exe
195 local kernel="$o_kernel"
196  
197 # o_subtarget can be le, be, le64, be64, le-glibc, le64-glibc, etc..
198 is64="$(echo $o_subtarget | grep -o 64)"
199 [ "$(echo "$o_subtarget" | grep -o '^..')" = "le" ] && isel="el"
200 qemu_exe="qemu-system-mips$is64$isel"
201  
202 [ -n "$kernel" ] || kernel="$o_bindir/openwrt-malta-${o_subtarget%-*}-vmlinux-initramfs.elf"
203  
204 # NOTE: order of wan, lan -device arguments matters as it will affect which
205 # one will be actually used as the wan, lan network interface inside the
206 # guest machine
207 "$qemu_exe" -machine malta -nographic \
208 -netdev bridge,id=wan,br="$BR_WAN,helper=$HELPER" -device pcnet,netdev=wan,mac="$MAC_WAN" \
209 -netdev bridge,id=lan,br="$BR_LAN,helper=$HELPER" -device pcnet,netdev=lan,mac="$MAC_LAN" \
210 -kernel "$kernel" \
211 "${o_qemu_extra[@]}"
212 }
213  
214 start_qemu_x86() {
215 local rootfs="$o_rootfs"
216 local qemu_exe
217  
218 [ -n "$rootfs" ] || {
219 rootfs="$o_bindir/openwrt-$o_target-${o_subtarget%-*}-combined-ext4.img"
220 if [ ! -f "$rootfs" -a -s "$rootfs.gz" ]; then
221 gunzip "$rootfs.gz"
222 fi
223 }
224 #
225 # generic: 32-bit, pentium4 (CONFIG_MPENTIUM4), kvm guest, virtio
226 # legacy: 32-bit, i486 (CONFIG_M486)
227 # 64: 64-bit, kvm guest, virtio
228 #
229 case "${o_subtarget%-*}" in
230 legacy) qemu_exe="qemu-system-i386" ;;
231 generic|64) qemu_exe="qemu-system-x86_64" ;;
232 *)
233 __errmsg "target $o_target: unknown subtarget $o_subtarget"
234 return 1
235 ;;
236 esac
237  
238 case "${o_subtarget%-*}" in
239 legacy)
240 # use IDE (PATA) disk instead of AHCI (SATA). Refer to link
241 # [1] for related discussions
242 #
243 # To use AHCI interface
244 #
245 # -device ich9-ahci,id=ahci \
246 # -device ide-drive,drive=drv0,bus=ahci.0 \
247 # -drive "file=$rootfs,format=raw,id=drv0,if=none" \
248 #
249 # [1] https://dev.openwrt.org/ticket/17947
250 "$qemu_exe" -nographic \
251 -netdev bridge,id=lan,br="$BR_LAN,helper=$HELPER" -device e1000,id=devlan,netdev=lan,mac="$MAC_LAN" \
252 -netdev bridge,id=wan,br="$BR_WAN,helper=$HELPER" -device e1000,id=devwan,netdev=wan,mac="$MAC_WAN" \
253 -device ide-drive,drive=drv0 \
254 -drive "file=$rootfs,format=raw,id=drv0,if=none" \
255 "${o_qemu_extra[@]}"
256 ;;
257 generic|64)
258 "$qemu_exe" -nographic \
259 -netdev bridge,id=lan,br="$BR_LAN,helper=$HELPER" -device virtio-net-pci,id=devlan,netdev=lan,mac="$MAC_LAN" \
260 -netdev bridge,id=wan,br="$BR_WAN,helper=$HELPER" -device virtio-net-pci,id=devwan,netdev=wan,mac="$MAC_WAN" \
261 -drive "file=$rootfs,format=raw,if=virtio" \
262 "${o_qemu_extra[@]}"
263 ;;
264 esac
265 }
266  
267 start_qemu() {
268 case "$o_target" in
269 armvirt) start_qemu_armvirt ;;
270 malta) start_qemu_malta ;;
271 x86) start_qemu_x86 ;;
272 *)
273 __errmsg "target $o_target is not supported yet"
274 return 1
275 ;;
276 esac
277 }
278  
279 check_setup \
280 && parse_args "$@" \
281 && start_qemu