Dropbear 是一套来自澳大利亚的 *nix SSH 工具集，以体积微小著称，因此在嵌入式环境被广泛中使用。

1. 编译 dropbear

$ wget %7Ematt/dropbear/releases/dropbear-0.52.tar.gz

$ wget

$ tar zxvf dropbear-0.52.tar.gz

$ cd dropbear-0.52

$ patch -p1 < ../dropbear0.52-android.patch

patching file common-session.c

patching file loginrec.c

patching file runopts.h

patching file svr-auth.c

patching file svr-authpasswd.c

patching file svr-authpubkey.c

patching file svr-chansession.c

patching file svr-runopts.c

1) zlib support

所使用的编译器未有zlib库支持，因此需要先未其增加zlib支持，/home/install为交叉编译器所在目录。

$ ls -l /home/install

lrwxrwxrwx 1 root root 54 2009-11-28 10:50 /home/install -> /home/goosen/works/buildroot/build_arm/staging_dir/usr

$ ./configure --prefix=/home/install

$ make CC=arm-linux-gcc

$ make install

2) 静态编译 dropbear

$ cd dropbear-0.52/

$ ./configure --host=arm-linux

//$ STATIC=1 make PROGRAMS="dropbear dropbearkey"

$ STATIC=1 make

2. 配置 dropbear

1) generate keys

~ $: adb shell

# mkdir /data/dropbear

# dropbearkey -t rsa -f /data/dropbear/dropbear_rsa_host_key

# dropbearkey -t dss -f /data/dropbear/dropbear_dss_host_key

2) start dropbear

# dropbear -h

Dropbear sshd v0.52

Usage: dropbear [options]

Options are:

-A Android Mode, specify a user explicitly

-N Android Mode, user name

-C Android Mode, password

-R Android Mode, public key file (authorized_keys)

-U Android Mode, UID

-G Android Mode, GID

-b bannerfile    Display the contents of bannerfile before user login

(default: none)

-d dsskeyfile    Use dsskeyfile for the dss host key

(default: /etc/dropbear/dropbear_dss_host_key)

-r rsakeyfile    Use rsakeyfile for the rsa host key

(default: /etc/dropbear/dropbear_rsa_host_key)

-F        Don't fork into background

-E        Log to stderr rather than syslog

-m        Don't display the motd on login

-w        Disallow root logins

-s        Disable password logins

-g        Disable password logins for root

-j        Disable local port forwarding

-k        Disable remote port forwarding

-a        Allow connections to forwarded ports from any host

-p [address:]port

Listen on specified tcp port (and optionally address),

up to 10 can be specified

(default port is 22 if none specified)

-P PidFile    Create pid file PidFile

(default /var/run/dropbear.pid)

-i        Start for inetd

-W (default 24576, larger may be faster, max 1MB)

-K (0 is never, default 0)

-I (0 is never, default 0)

# ln -s /data/dropbear /etc/dropbear

# dropbear -E

让android启动的时候自动启动 dropbear, 编辑 /init.rc，增加，

#dropbear start

service dropbear /system/sbin/dropbear -E

oneshot

3) connect (u can use dyndns from market to get a domain name )

$ ssh root@yourdomain.dyndns.org

# cat /home/root/.profile

PATH=/usr/bin:/usr/sbin:/bin:/sbin:/system/sbin:/system/bin:/system/xbin:/data/local/bin

export PATH

# ps | grep 'dropbear'

797 root       436 S    /system/sbin/dropbear -E

973 root       492 S    /system/sbin/dropbear -E

984 root       492 S    /system/sbin/dropbear -E

1036 root      3044 S    grep dropbear

注，此处是~/.profile文件(默认环境变量)，而不是~/.bashrc。不过/data/dropbear/.profile 未起作用，暂时不明。

3. 碰到的问题及解决方法

1)为用户设置密码出现，

# passwd root

passwd: unknown uid 0

修改 /etc/passwd 如下，

/ # cat /etc/passwd

#root:x:1000:1000:Linux User,,,:/home/root:/bin/sh

root:x:0:0:Linux User,,,:/home/root:/bin/sh

2)登录的时候dropbear提示，

user 'root' has invalid shel

确保/etc/passwd与/etc/shells中shell的设置一致,

# cat /etc/shells

#/system/bin/sh

/bin/sh

源码、补丁及参考的相关文档如下，

http://blog.csdn.net/tekkamanitachi/archive/2009/06/26/4300854.aspx

~matt/dropbear/releases/dropbear-0.52.tar.gz

http://blog.linjian.org/articles/dropbear-pam-patch/

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