路由器逆向分析------QEMU的基本使用方法(MIPS)
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本文博客地址:http://blog.csdn.net/qq1084283172/article/details/69258334
一、QEMU的运行模式
直接摘抄自己《揭秘家用路由器0day漏洞挖掘技术》,网上查了一下也没有找到令人满意的QEMU的使用说明,就采用这本书上的介绍。如果后期能够找到比较满意的QEMU的使用方法的说明,再添加上来。
QEMU模拟器主要有两种比较常见的运作模式:User Mode(使用者模式)、System Mode(系统模式)。User Mode模式下,用户只需要将各种不同平台的处理编译得到的Linux程序放在QEMU虚拟中运行即可,其他的事情全部由QEMU虚拟机来完成,不需要用户自定义内核和虚拟磁盘等文件;System Mode模式下,最明显的特点是用户可以为QEMU虚拟机指定运行的内核或者虚拟硬盘等文件,简单来说系统模式下QEMU虚拟机是可根据用户的要求配置的。
二、QEMU在使用者模式下执行程序
当程序是静态编译(gcc编译的时候,加了静态编译选项 "-static" )完成,运行时 不需要依赖动态链接库 ,在使用QEMU运行编译好的Linux程序使用下面的命令就好:
# 查看可执行程序hello的文件类型MIPS32$ file hellohello: ELF 32-bit MSB executable, MIPS, MIPS32 version 1 (SYSV), statically linked, not stripped$ cp $(which qemu-mips) ./# 使用qemu-mips加载hello程序$ ./qemu-mips hello "Hello World"Hello World
当程序是动态编译(gcc编译的时候,没有静态编译选项 "-static" )完成,程序运行时 需要依赖动态链接库 ,在使用QEMU运行编译好的Linux程序使用下面的命令就好:
# 查看即将执行的文件的类型$ file bin/busybox# 拷贝qemu-mips到当前目录$ cp $(which qemu-mips) ./# 直接运行报错$ ./qemu-mips bin/busybox# 更改QEMU-MIPS执行的根目录到当前目录$ sudo chroot . ./qemu-mips ./bin/busybox
执行的结果截图:
QEMU使用者模式下使用的命令行帮助,以 qemu-mipsel 为例:
fly2016@ubuntu:~$ qemu-mipsel --helpusage: qemu-mipsel [options] program [arguments...]Linux CPU emulator (compiled for mipsel emulation)Options and associated environment variables:Argument Env-variable Description-h print this help-help -g port QEMU_GDB wait gdb connection to 'port'-L path QEMU_LD_PREFIX set the elf interpreter prefix to 'path'-s size QEMU_STACK_SIZE set the stack size to 'size' bytes-cpu model QEMU_CPU select CPU (-cpu help for list)-E var=value QEMU_SET_ENV sets targets environment variable (see below)-U var QEMU_UNSET_ENV unsets targets environment variable (see below)-0 argv0 QEMU_ARGV0 forces target process argv[0] to be 'argv0'-r uname QEMU_UNAME set qemu uname release string to 'uname'-B address QEMU_GUEST_BASE set guest_base address to 'address'-R size QEMU_RESERVED_VA reserve 'size' bytes for guest virtual address space-d item[,...] QEMU_LOG enable logging of specified items (use '-d help' for a list of items)-D logfile QEMU_LOG_FILENAME write logs to 'logfile' (default stderr)-p pagesize QEMU_PAGESIZE set the host page size to 'pagesize'-singlestep QEMU_SINGLESTEP run in singlestep mode-strace QEMU_STRACE log system calls-seed QEMU_RAND_SEED Seed for pseudo-random number generator-trace QEMU_TRACE [[enable=]<pattern>][,events=<file>][,file=<file>]-version QEMU_VERSION display version information and exitDefaults:QEMU_LD_PREFIX = /usr/gnemul/qemu-mipselQEMU_STACK_SIZE = 8388608 byteYou can use -E and -U options or the QEMU_SET_ENV andQEMU_UNSET_ENV environment variables to set and unsetenvironment variables for the target process.It is possible to provide several variables by separating themby commas in getsubopt(3) style. Additionally it is possible toprovide the -E and -U options multiple times.The following lines are equivalent: -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUGNote that if you provide several changes to a single variablethe last change will stay in effect.
三、QEMU的系统模式使用
QEMU运行在系统模式下,需要为QEMU指定 内核镜像、IDE硬盘0/1镜像、内核命令行 等参数,QEMU虚拟机才能正常运行。Debian官网提供了QEMU虚拟机各种平台架构的内核镜像、硬盘文件镜像文件的下载,下载地址为:https://people.debian.org/~aurel32/qemu/,其中mips为大端机的,mipsel为小端机的。
这里以下载 mips大端机 的虚拟机镜像文件为例,具体的下载网址为:https://people.debian.org/~aurel32/qemu/mips/,点击进去以后会发现mips虚拟机镜像文件的下载说明。我们根据mips虚拟机镜像文件的使用命令参数进行选择性的下载。
Debian Squeeze and Wheezy mips images for QEMU==============================================This directory contains Debian Squeeze and Wheezy mips images for QEMU andthe corresponding kernels and initrds: 1d58f831f5e5064753c0c138d8d74057 debian_squeeze_mips_standard.qcow2 cb56139b63b88fdb38776051d28bb750 vmlinux-2.6.32-5-4kc-malta 7165e80b0e5c5c3e40f2ca46401373ce vmlinux-2.6.32-5-5kc-malta bf699f435160b0bd9ac62905fa64701e debian_wheezy_mips_standard.qcow2 1fecbe19ff49a6fd715901483b23647c vmlinux-3.2.0-4-4kc-malta 19e6e853d4a7a7b9ed5e787b7f875835 vmlinux-3.2.0-4-5kc-maltaBoth images are 25GiB images in QCOW2 format on which a Debian Squeeze orWheezy "Standard system" installation has been performed. The otherinstallation options are the following: - Keyboard: US - Locale: en_US - Mirror: ftp.debian.org - Hostname: debian-mips - Root password: root - User account: user - User password: userTo use this image, you need to install QEMU 1.1.0 (or later). Start QEMUwith the following arguments for a 32-bit machine: - qemu-system-mips -M malta -kernel vmlinux-2.6.32-5-4kc-malta -hda debian_squeeze_mips_standard.qcow2 -append "root=/dev/sda1 console=tty0" - qemu-system-mips -M malta -kernel vmlinux-3.2.0-4-4kc-malta -hda debian_wheezy_mips_standard.qcow2 -append "root=/dev/sda1 console=tty0"Start QEMU with the following arguments for a 64-bit machine: - qemu-system-mips64 -M malta -kernel vmlinux-2.6.32-5-5kc-malta -hda debian_squeeze_mips_standard.qcow2 -append "root=/dev/sda1 console=tty0" - qemu-system-mips64 -M malta -kernel vmlinux-3.2.0-4-5kc-malta -hda debian_wheezy_mips_standard.qcow2 -append "root=/dev/sda1 console=tty0"By default QEMU emulates a machine with 128MiB of RAM. You can use the -m optionto increase or decrease the size of the RAM. It is however limited to 256MiBwith a 32-bit kernel. With a 64-bit kernel and QEMU >= 1.7, it is possible touse up to 2047MiB of RAM, passing the memory map to the kernel, adding a mem=argument to the append parameters as follow: "mem=256m@0x0 mem=XXXm@0x90000000"where XXX represents the total memory size minus 256MiB. If you don't want tostart QEMU in graphic mode, you can use the -nographic option. The image isconfigured to display a login prompt on the first serial port (ttys0). If youwant to switch the boot messages to the serial port, you need to replace"console=tty0" by "console=ttyS0".
ubuntu下可以使用下面的命令进行mips和mipsel虚拟机镜像配置文件的下载:
# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# Start QEMU with the following arguments for a 32-bit machine:$ qemu-system-mips -M malta -kernel vmlinux-2.6.32-5-4kc-malta -hda debian_squeeze_mips_standard.qcow2 -append "root=/dev/sda1 console=tty0"$ qemu-system-mips -M malta -kernel vmlinux-3.2.0-4-4kc-malta -hda debian_wheezy_mips_standard.qcow2 -append "root=/dev/sda1 console=tty0"# for MIPS 32bit ###############:# 内核版本为2.6.x$ wget https://people.debian.org/~aurel32/qemu/mips/vmlinux-2.6.32-5-4kc-malta$ wget https://people.debian.org/~aurel32/qemu/mips/debian_squeeze_mips_standard.qcow2# 内核版本为3.2.x$ wget https://people.debian.org/~aurel32/qemu/mips/vmlinux-3.2.0-4-4kc-malta$ wget https://people.debian.org/~aurel32/qemu/mips/debian_wheezy_mips_standard.qcow2# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# Start QEMU with the following arguments for a 64-bit machine:$ qemu-system-mips64 -M malta -kernel vmlinux-2.6.32-5-5kc-malta -hda debian_squeeze_mips_standard.qcow2 -append "root=/dev/sda1 console=tty0"$ qemu-system-mips64 -M malta -kernel vmlinux-3.2.0-4-5kc-malta -hda debian_wheezy_mips_standard.qcow2 -append "root=/dev/sda1 console=tty0"# for MIPS 64bit ###############:# 内核版本为2.6.x$ wget https://people.debian.org/~aurel32/qemu/mips/vmlinux-2.6.32-5-5kc-malta$ wget https://people.debian.org/~aurel32/qemu/mips/debian_squeeze_mips_standard.qcow2# 内核版本为3.2.x$ wget https://people.debian.org/~aurel32/qemu/mips/vmlinux-3.2.0-4-5kc-malta$ wget https://people.debian.org/~aurel32/qemu/mips/debian_wheezy_mips_standard.qcow2# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# Start QEMU with the following arguments for a 32-bit machine:$ qemu-system-mipsel -M malta -kernel vmlinux-2.6.32-5-4kc-malta -hda debian_squeeze_mipsel_standard.qcow2 -append "root=/dev/sda1 console=tty0"$ qemu-system-mipsel -M malta -kernel vmlinux-3.2.0-4-4kc-malta -hda debian_wheezy_mipsel_standard.qcow2 -append "root=/dev/sda1 console=tty0"# for MIPSEL 32bit ###############:# 内核版本为2.6.x$ wget https://people.debian.org/~aurel32/qemu/mipsel/vmlinux-2.6.32-5-4kc-malta$ wget https://people.debian.org/~aurel32/qemu/mipsel/debian_squeeze_mipsel_standard.qcow2# 内核版本为3.2.x$ wget https://people.debian.org/~aurel32/qemu/mipsel/vmlinux-3.2.0-4-4kc-malta$ wget https://people.debian.org/~aurel32/qemu/mipsel/debian_wheezy_mipsel_standard.qcow2# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++# Start QEMU with the following arguments for a 64-bit machine:$ qemu-system-mips64el -M malta -kernel vmlinux-2.6.32-5-5kc-malta -hda debian_squeeze_mipsel_standard.qcow2 -append "root=/dev/sda1 console=tty0"$ qemu-system-mips64el -M malta -kernel vmlinux-3.2.0-4-5kc-malta -hda debian_wheezy_mipsel_standard.qcow2 -append "root=/dev/sda1 console=tty0"# for MIPSEL 64bit ###############:# 内核版本为2.6.x$ wget https://people.debian.org/~aurel32/qemu/mipsel/vmlinux-2.6.32-5-5kc-malta $ wget https://people.debian.org/~aurel32/qemu/mipsel/debian_squeeze_mipsel_standard.qcow2# 内核版本为3.2.x$ wget https://people.debian.org/~aurel32/qemu/mipsel/vmlinux-3.2.0-4-5kc-malta $ wget https://people.debian.org/~aurel32/qemu/mipsel/debian_wheezy_mipsel_standard.qcow2使用 qemu-system-mips 启动内核2.6.x版本MIPS 32bit的QEMU虚拟机镜像,QEMU启动失败,结果如下图:
$ sudo qemu-system-mips -M malta -kernel vmlinux-2.6.32-5-4kc-malta -hda debian_squeeze_mips_standard.qcow2 -append "root=/dev/sda1 console=tty0" -nographic
QEMU系统者模式下使用的命令行帮助,以 qemu-system-mips 为例,功能挺强大的:
fly2016@ubuntu:~$ qemu-system-mips -hQEMU emulator version 2.8.92 (v2.9.0-rc2-42-g6499fd1-dirty)Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developersusage: qemu-system-mips [options] [disk_image]'disk_image' is a raw hard disk image for IDE hard disk 0Standard options:-h or -help display this help and exit-version display version information and exit-machine [type=]name[,prop[=value][,...]] selects emulated machine ('-machine help' for list) property accel=accel1[:accel2[:...]] selects accelerator supported accelerators are kvm, xen, tcg (default: tcg) kernel_irqchip=on|off|split controls accelerated irqchip support (default=off) vmport=on|off|auto controls emulation of vmport (default: auto) kvm_shadow_mem=size of KVM shadow MMU in bytes dump-guest-core=on|off include guest memory in a core dump (default=on) mem-merge=on|off controls memory merge support (default: on) igd-passthru=on|off controls IGD GFX passthrough support (default=off) aes-key-wrap=on|off controls support for AES key wrapping (default=on) dea-key-wrap=on|off controls support for DEA key wrapping (default=on) suppress-vmdesc=on|off disables self-describing migration (default=off) nvdimm=on|off controls NVDIMM support (default=off) enforce-config-section=on|off enforce configuration section migration (default=off)-cpu cpu select CPU ('-cpu help' for list)-accel [accel=]accelerator[,thread=single|multi] select accelerator ('-accel help for list') thread=single|multi (enable multi-threaded TCG)-smp [cpus=]n[,maxcpus=cpus][,cores=cores][,threads=threads][,sockets=sockets] set the number of CPUs to 'n' [default=1] maxcpus= maximum number of total cpus, including offline CPUs for hotplug, etc cores= number of CPU cores on one socket threads= number of threads on one CPU core sockets= number of discrete sockets in the system-numa node[,mem=size][,cpus=firstcpu[-lastcpu]][,nodeid=node]-numa node[,memdev=id][,cpus=firstcpu[-lastcpu]][,nodeid=node]-add-fd fd=fd,set=set[,opaque=opaque] Add 'fd' to fd 'set'-set group.id.arg=value set <arg> parameter for item <id> of type <group> i.e. -set drive.$id.file=/path/to/image-global driver.property=value-global driver=driver,property=property,value=value set a global default for a driver property-boot [order=drives][,once=drives][,menu=on|off] [,splash=sp_name][,splash-time=sp_time][,reboot-timeout=rb_time][,strict=on|off] 'drives': floppy (a), hard disk (c), CD-ROM (d), network (n) 'sp_name': the file's name that would be passed to bios as logo picture, if menu=on 'sp_time': the period that splash picture last if menu=on, unit is ms 'rb_timeout': the timeout before guest reboot when boot failed, unit is ms-m [size=]megs[,slots=n,maxmem=size] configure guest RAM size: initial amount of guest memory slots: number of hotplug slots (default: none) maxmem: maximum amount of guest memory (default: none)NOTE: Some architectures might enforce a specific granularity-mem-path FILE provide backing storage for guest RAM-mem-prealloc preallocate guest memory (use with -mem-path)-k language use keyboard layout (for example 'fr' for French)-audio-help print list of audio drivers and their options-soundhw c1,... enable audio support and only specified sound cards (comma separated list) use '-soundhw help' to get the list of supported cards use '-soundhw all' to enable all of them-balloon none disable balloon device-balloon virtio[,addr=str] enable virtio balloon device (default)-device driver[,prop[=value][,...]] add device (based on driver) prop=value,... sets driver properties use '-device help' to print all possible drivers use '-device driver,help' to print all possible properties-name string1[,process=string2][,debug-threads=on|off] set the name of the guest string1 sets the window title and string2 the process name (on Linux) When debug-threads is enabled, individual threads are given a separate name (on Linux) NOTE: The thread names are for debugging and not a stable API.-uuid %08x-%04x-%04x-%04x-%012x specify machine UUID:Block device options:-fda/-fdb file use 'file' as floppy disk 0/1 image-hda/-hdb file use 'file' as IDE hard disk 0/1 image-hdc/-hdd file use 'file' as IDE hard disk 2/3 image-cdrom file use 'file' as IDE cdrom image (cdrom is ide1 master)-blockdev [driver=]driver[,node-name=N][,discard=ignore|unmap] [,cache.direct=on|off][,cache.no-flush=on|off] [,read-only=on|off][,detect-zeroes=on|off|unmap] [,driver specific parameters...] configure a block backend-drive [file=file][,if=type][,bus=n][,unit=m][,media=d][,index=i] [,cyls=c,heads=h,secs=s[,trans=t]][,snapshot=on|off] [,cache=writethrough|writeback|none|directsync|unsafe][,format=f] [,serial=s][,addr=A][,rerror=ignore|stop|report] [,werror=ignore|stop|report|enospc][,id=name][,aio=threads|native] [,readonly=on|off][,copy-on-read=on|off] [,discard=ignore|unmap][,detect-zeroes=on|off|unmap] [[,bps=b]|[[,bps_rd=r][,bps_wr=w]]] [[,iops=i]|[[,iops_rd=r][,iops_wr=w]]] [[,bps_max=bm]|[[,bps_rd_max=rm][,bps_wr_max=wm]]] [[,iops_max=im]|[[,iops_rd_max=irm][,iops_wr_max=iwm]]] [[,iops_size=is]] [[,group=g]] use 'file' as a drive image-mtdblock file use 'file' as on-board Flash memory image-sd file use 'file' as SecureDigital card image-pflash file use 'file' as a parallel flash image-snapshot write to temporary files instead of disk image files-hdachs c,h,s[,t] force hard disk 0 physical geometry and the optional BIOS translation (t=none or lba) (usually QEMU can guess them)-fsdev fsdriver,id=id[,path=path,][security_model={mapped-xattr|mapped-file|passthrough|none}] [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd] [[,throttling.bps-total=b]|[[,throttling.bps-read=r][,throttling.bps-write=w]]] [[,throttling.iops-total=i]|[[,throttling.iops-read=r][,throttling.iops-write=w]]] [[,throttling.bps-total-max=bm]|[[,throttling.bps-read-max=rm][,throttling.bps-write-max=wm]]] [[,throttling.iops-total-max=im]|[[,throttling.iops-read-max=irm][,throttling.iops-write-max=iwm]]] [[,throttling.iops-size=is]]-virtfs local,path=path,mount_tag=tag,security_model=[mapped-xattr|mapped-file|passthrough|none] [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd]-virtfs_synth Create synthetic file system image:USB options:-usb enable the USB driver (will be the default soon)-usbdevice name add the host or guest USB device 'name':Display options:-display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off] [,window_close=on|off][,gl=on|off]-display gtk[,grab_on_hover=on|off][,gl=on|off]|-display vnc=<display>[,<optargs>]-display curses-display none select display typeThe default display is equivalent to"-vnc localhost:0,to=99,id=default"-nographic disable graphical output and redirect serial I/Os to console-curses shorthand for -display curses-no-frame open SDL window without a frame and window decorations-alt-grab use Ctrl-Alt-Shift to grab mouse (instead of Ctrl-Alt)-ctrl-grab use Right-Ctrl to grab mouse (instead of Ctrl-Alt)-no-quit disable SDL window close capability-sdl shorthand for -display sdl-spice [port=port][,tls-port=secured-port][,x509-dir=<dir>] [,x509-key-file=<file>][,x509-key-password=<file>] [,x509-cert-file=<file>][,x509-cacert-file=<file>] [,x509-dh-key-file=<file>][,addr=addr][,ipv4|ipv6|unix] [,tls-ciphers=<list>] [,tls-channel=[main|display|cursor|inputs|record|playback]] [,plaintext-channel=[main|display|cursor|inputs|record|playback]] [,sasl][,password=<secret>][,disable-ticketing] [,image-compression=[auto_glz|auto_lz|quic|glz|lz|off]] [,jpeg-wan-compression=[auto|never|always]] [,zlib-glz-wan-compression=[auto|never|always]] [,streaming-video=[off|all|filter]][,disable-copy-paste] [,disable-agent-file-xfer][,agent-mouse=[on|off]] [,playback-compression=[on|off]][,seamless-migration=[on|off]] [,gl=[on|off]][,rendernode=<file>] enable spice at least one of {port, tls-port} is mandatory-portrait rotate graphical output 90 deg left (only PXA LCD)-rotate <deg> rotate graphical output some deg left (only PXA LCD)-vga [std|cirrus|vmware|qxl|xenfb|tcx|cg3|virtio|none] select video card type-full-screen start in full screen-vnc <display> shorthand for -display vnc=<display>:Network options:-netdev user,id=str[,ipv4[=on|off]][,net=addr[/mask]][,host=addr] [,ipv6[=on|off]][,ipv6-net=addr[/int]][,ipv6-host=addr] [,restrict=on|off][,hostname=host][,dhcpstart=addr] [,dns=addr][,ipv6-dns=addr][,dnssearch=domain][,tftp=dir] [,bootfile=f][,hostfwd=rule][,guestfwd=rule][,smb=dir[,smbserver=addr]] configure a user mode network backend with ID 'str', its DHCP server and optional services-netdev tap,id=str[,fd=h][,fds=x:y:...:z][,ifname=name][,script=file][,downscript=dfile] [,br=bridge][,helper=helper][,sndbuf=nbytes][,vnet_hdr=on|off][,vhost=on|off] [,vhostfd=h][,vhostfds=x:y:...:z][,vhostforce=on|off][,queues=n] [,poll-us=n] configure a host TAP network backend with ID 'str' connected to a bridge (default=br0) use network scripts 'file' (default=/etc/qemu-ifup) to configure it and 'dfile' (default=/etc/qemu-ifdown) to deconfigure it use '[down]script=no' to disable script execution use network helper 'helper' (default=/usr/local/libexec/qemu-bridge-helper) to configure it use 'fd=h' to connect to an already opened TAP interface use 'fds=x:y:...:z' to connect to already opened multiqueue capable TAP interfaces use 'sndbuf=nbytes' to limit the size of the send buffer (the default is disabled 'sndbuf=0' to enable flow control set 'sndbuf=1048576') use vnet_hdr=off to avoid enabling the IFF_VNET_HDR tap flag use vnet_hdr=on to make the lack of IFF_VNET_HDR support an error condition use vhost=on to enable experimental in kernel accelerator (only has effect for virtio guests which use MSIX) use vhostforce=on to force vhost on for non-MSIX virtio guests use 'vhostfd=h' to connect to an already opened vhost net device use 'vhostfds=x:y:...:z to connect to multiple already opened vhost net devices use 'queues=n' to specify the number of queues to be created for multiqueue TAP use 'poll-us=n' to speciy the maximum number of microseconds that could be spent on busy polling for vhost net-netdev bridge,id=str[,br=bridge][,helper=helper] configure a host TAP network backend with ID 'str' that is connected to a bridge (default=br0) using the program 'helper (default=/usr/local/libexec/qemu-bridge-helper)-netdev l2tpv3,id=str,src=srcaddr,dst=dstaddr[,srcport=srcport][,dstport=dstport] [,rxsession=rxsession],txsession=txsession[,ipv6=on/off][,udp=on/off] [,cookie64=on/off][,counter][,pincounter][,txcookie=txcookie] [,rxcookie=rxcookie][,offset=offset] configure a network backend with ID 'str' connected to an Ethernet over L2TPv3 pseudowire. Linux kernel 3.3+ as well as most routers can talk L2TPv3. This transport allows connecting a VM to a VM, VM to a router and even VM to Host. It is a nearly-universal standard (RFC3391). Note - this implementation uses static pre-configured tunnels (same as the Linux kernel). use 'src=' to specify source address use 'dst=' to specify destination address use 'udp=on' to specify udp encapsulation use 'srcport=' to specify source udp port use 'dstport=' to specify destination udp port use 'ipv6=on' to force v6 L2TPv3 uses cookies to prevent misconfiguration as well as a weak security measure use 'rxcookie=0x012345678' to specify a rxcookie use 'txcookie=0x012345678' to specify a txcookie use 'cookie64=on' to set cookie size to 64 bit, otherwise 32 use 'counter=off' to force a 'cut-down' L2TPv3 with no counter use 'pincounter=on' to work around broken counter handling in peer use 'offset=X' to add an extra offset between header and data-netdev socket,id=str[,fd=h][,listen=[host]:port][,connect=host:port] configure a network backend to connect to another network using a socket connection-netdev socket,id=str[,fd=h][,mcast=maddr:port[,localaddr=addr]] configure a network backend to connect to a multicast maddr and port use 'localaddr=addr' to specify the host address to send packets from-netdev socket,id=str[,fd=h][,udp=host:port][,localaddr=host:port] configure a network backend to connect to another network using an UDP tunnel-netdev vhost-user,id=str,chardev=dev[,vhostforce=on|off] configure a vhost-user network, backed by a chardev 'dev'-netdev hubport,id=str,hubid=n configure a hub port on QEMU VLAN 'n'-net nic[,vlan=n][,macaddr=mac][,model=type][,name=str][,addr=str][,vectors=v] old way to create a new NIC and connect it to VLAN 'n' (use the '-device devtype,netdev=str' option if possible instead)-net dump[,vlan=n][,file=f][,len=n] dump traffic on vlan 'n' to file 'f' (max n bytes per packet)-net none use it alone to have zero network devices. If no -net option is provided, the default is '-net nic -net user'-net [user|tap|bridge|socket][,vlan=n][,option][,option][,...] old way to initialize a host network interface (use the -netdev option if possible instead):Character device options:-chardev help-chardev null,id=id[,mux=on|off][,logfile=PATH][,logappend=on|off]-chardev socket,id=id[,host=host],port=port[,to=to][,ipv4][,ipv6][,nodelay][,reconnect=seconds] [,server][,nowait][,telnet][,reconnect=seconds][,mux=on|off] [,logfile=PATH][,logappend=on|off][,tls-creds=ID] (tcp)-chardev socket,id=id,path=path[,server][,nowait][,telnet][,reconnect=seconds] [,mux=on|off][,logfile=PATH][,logappend=on|off] (unix)-chardev udp,id=id[,host=host],port=port[,localaddr=localaddr] [,localport=localport][,ipv4][,ipv6][,mux=on|off] [,logfile=PATH][,logappend=on|off]-chardev msmouse,id=id[,mux=on|off][,logfile=PATH][,logappend=on|off]-chardev vc,id=id[[,width=width][,height=height]][[,cols=cols][,rows=rows]] [,mux=on|off][,logfile=PATH][,logappend=on|off]-chardev ringbuf,id=id[,size=size][,logfile=PATH][,logappend=on|off]-chardev file,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]-chardev pipe,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]-chardev pty,id=id[,mux=on|off][,logfile=PATH][,logappend=on|off]-chardev stdio,id=id[,mux=on|off][,signal=on|off][,logfile=PATH][,logappend=on|off]-chardev serial,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]-chardev tty,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]-chardev parallel,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]-chardev parport,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]:Device URL Syntax:-iscsi [user=user][,password=password] [,header-digest=CRC32C|CR32C-NONE|NONE-CRC32C|NONE [,initiator-name=initiator-iqn][,id=target-iqn] [,timeout=timeout] iSCSI session parametersBluetooth(R) options:-bt hci,null dumb bluetooth HCI - doesn't respond to commands-bt hci,host[:id] use host's HCI with the given name-bt hci[,vlan=n] emulate a standard HCI in virtual scatternet 'n'-bt vhci[,vlan=n] add host computer to virtual scatternet 'n' using VHCI-bt device:dev[,vlan=n] emulate a bluetooth device 'dev' in scatternet 'n':TPM device options:-tpmdev passthrough,id=id[,path=path][,cancel-path=path] use path to provide path to a character device; default is /dev/tpm0 use cancel-path to provide path to TPM's cancel sysfs entry; if not provided it will be searched for in /sys/class/misc/tpm?/device:Linux/Multiboot boot specific:-kernel bzImage use 'bzImage' as kernel image-append cmdline use 'cmdline' as kernel command line-initrd file use 'file' as initial ram disk-dtb file use 'file' as device tree image:Debug/Expert options:-fw_cfg [name=]<name>,file=<file> add named fw_cfg entry with contents from file-fw_cfg [name=]<name>,string=<str> add named fw_cfg entry with contents from string-serial dev redirect the serial port to char device 'dev'-parallel dev redirect the parallel port to char device 'dev'-monitor dev redirect the monitor to char device 'dev'-qmp dev like -monitor but opens in 'control' mode-qmp-pretty dev like -qmp but uses pretty JSON formatting-mon [chardev=]name[,mode=readline|control]-debugcon dev redirect the debug console to char device 'dev'-pidfile file write PID to 'file'-singlestep always run in singlestep mode-S freeze CPU at startup (use 'c' to start execution)-realtime [mlock=on|off] run qemu with realtime features mlock=on|off controls mlock support (default: on)-gdb dev wait for gdb connection on 'dev'-s shorthand for -gdb tcp::1234-d item1,... enable logging of specified items (use '-d help' for a list of log items)-D logfile output log to logfile (default stderr)-dfilter range,.. filter debug output to range of addresses (useful for -d cpu,exec,etc..)-L path set the directory for the BIOS, VGA BIOS and keymaps-bios file set the filename for the BIOS-enable-kvm enable KVM full virtualization support-xen-domid id specify xen guest domain id-xen-create create domain using xen hypercalls, bypassing xend warning: should not be used when xend is in use-xen-attach attach to existing xen domain xend will use this when starting QEMU-no-reboot exit instead of rebooting-no-shutdown stop before shutdown-loadvm [tag|id] start right away with a saved state (loadvm in monitor)-daemonize daemonize QEMU after initializing-option-rom rom load a file, rom, into the option ROM space-rtc [base=utc|localtime|date][,clock=host|rt|vm][,driftfix=none|slew] set the RTC base and clock, enable drift fix for clock ticks (x86 only)-icount [shift=N|auto][,align=on|off][,sleep=on|off,rr=record|replay,rrfile=<filename>,rrsnapshot=<snapshot>] enable virtual instruction counter with 2^N clock ticks per instruction, enable aligning the host and virtual clocks or disable real time cpu sleeping-watchdog model enable virtual hardware watchdog [default=none]-watchdog-action reset|shutdown|poweroff|pause|debug|none action when watchdog fires [default=reset]-echr chr set terminal escape character instead of ctrl-a-virtioconsole c set virtio console-show-cursor show cursor-tb-size n set TB size-incoming tcp:[host]:port[,to=maxport][,ipv4][,ipv6]-incoming rdma:host:port[,ipv4][,ipv6]-incoming unix:socketpath prepare for incoming migration, listen on specified protocol and socket address-incoming fd:fd-incoming exec:cmdline accept incoming migration on given file descriptor or from given external command-incoming defer wait for the URI to be specified via migrate_incoming-only-migratable allow only migratable devices-nodefaults don't create default devices-chroot dir chroot to dir just before starting the VM-runas user change to user id user just before starting the VM-semihosting semihosting mode-semihosting-config [enable=on|off][,target=native|gdb|auto][,arg=str[,...]] semihosting configuration-sandbox <arg> Enable seccomp mode 2 system call filter (default 'off').-readconfig <file>-writeconfig <file> read/write config file-nodefconfig do not load default config files at startup-no-user-config do not load user-provided config files at startup-trace [[enable=]<pattern>][,events=<file>][,file=<file>] specify tracing options-enable-fips enable FIPS 140-2 compliance-msg timestamp[=on|off] change the format of messages on|off controls leading timestamps (default:on)-dump-vmstate <file> Output vmstate information in JSON format to file. Use the scripts/vmstate-static-checker.py file to check for possible regressions in migration code by comparing two such vmstate dumps.:Generic object creation:-object TYPENAME[,PROP1=VALUE1,...] create a new object of type TYPENAME setting properties in the order they are specified. Note that the 'id' property must be set. These objects are placed in the '/objects' path.During emulation, the following keys are useful:ctrl-alt-f toggle full screenctrl-alt-n switch to virtual console 'n'ctrl-alt toggle mouse and keyboard grabWhen using -nographic, press 'ctrl-a h' to get some help.
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