qemu-router 之环境设计

fog posted @ 2008年8月07日 22:45 in 技术相关 with tags linux Embedded , 2257 阅读

最近想用qemu在linux下 build 一个环境,来模拟开发路由器。好处有很多,比如便于调试kernel阿,乱搞不会破坏系统阿之类的。

于是写了两个script,一个负责模拟router端,一个负责模拟客户机。整个环境配置如图:

                 +--------------------+
                 |                    |
                 |      Host PC       |
                 +--------------------+
                 | tap0 | tap1 |      |
                 +--+------+----------+
                    |      |
                    |      |
                 +--+------+---+------+
             wan | eth0 | eth1 |      |
                 +-------------+------+
                 +-------------+      |     Qemu emulate router
             lan | eth2 | eth3 |      |
                 +---+------+--+------+
                     |      |
                     |      |
      +-----------+  |   +--+---------+
      | client 1  |--+   | client 2   |     Qemu emulate PCs
      |           |      |            |

      +-----------+      +------------+

router模拟了2个wan口,2个lan口,wan口通过tap跟host(主机)联系,host端启动的script为/etc/qemu-ifup

#!/bin/sh
inf=$1
ip3=${inf##tap}

sudo /sbin/ifconfig $1 172.20.${ip3}.1
 

这样就保证了host端的tap interface根据tap0, tap1 ...来配置ip,使得tap0为172.20.0.1, tap1为172.20.1.1,从而配合router模拟出multi wan的环境。

然后是router的启动脚本q-router.sh

#!/bin/bash

port_base=8010
((port1 = port_base + 1))
((port2 = port_base + 2))

QEMU_PATH=/home/fog/study/kernel/emulate/qemu-0.9.1
export PATH=${QEMU_PATH}:/bin:/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin

IMAGE=linux-2.6.16/arch/i386/boot/bzImage

FS=fs-router.squashfs

QEMU=qemu

sudo ${QEMU} -nographic \
    -net nic -net tap \
    -net nic -net tap \
    -net nic,vlan=1 -net socket,vlan=1,listen=:${port1} \
    -net nic,vlan=2 -net socket,vlan=2,listen=:${port2} \
    -hda ${FS} -hdb ${FS} -kernel ${IMAGE} \
    -append "console=ttyS0 root=/dev/hdb rw sb=0x220,5,1,5 ide3=noprobe ide4=noprobe ide5=noprobe clock=pit" -s -S

'-s -S' 是为了gdb调试用的。eth0, eth1, eth2, eth3的ip设定都在root fs中的etc/rcS中实现。

client端pc的模拟就更简单了,为了方便,我直接把ip通过kernel的参数做了指定。q-client.sh

#!/bin/bash

port_base=8010
ip3_base=9
 
cn=$1 # client number
: ${cn:="1"}

((port = port_base + cn))
((ip3 = ip3_base + cn))


QEMU_PATH=/home/fog/study/kernel/emulate/qemu-0.9.1
export PATH=${QEMU_PATH}:/bin:/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin

IMAGE=linux-2.6.16/arch/i386/boot/bzImage

FS=fs-client.squashfs

QEMU=qemu

sudo ${QEMU} -nographic \
    -net nic,vlan=1 -net socket,vlan=1,connect=127.0.0.1:${port} \
    -hda ${FS} -hdb ${FS} -kernel ${IMAGE} \
    -append \
    "console=ttyS0 root=/dev/hdb rw \
     ip=192.168.${ip3}.2::192.168.${ip3}.1:255.255.255.0::eth0:off \
     sb=0x220,5,1,5 ide3=noprobe ide4=noprobe ide5=noprobe clock=pit"


 

这样,先启动router,然后启动client,一个简单的模拟环境就架起来了。

 

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