基于 Dropbear & Zlib 搭建轻量级的ssh server
【目的】
移植dropbear & zlib 在AM335X开发板上搭建轻量级的ssh server
【环境】
1、 Ubuntu 16.04发行版
2、 MC183平台
3、 交叉编译器arm-linux-gnueabihf-gcc-4.7.3
【步骤】
1、下载zlib-1.2.8.tar.gz dropbear-2015.67.tar.bz2源码。
2. 交叉编译zlib。
解压zlib-1.2.8.tar.gz
tar zvxf zlib-1.2.8.tar.gz
cd zlib-1.2.8
配置：
./configure --prefix=../../zlib/install
修该Makefile用于交叉编译，如下加粗字体为改动部分：
change Makefile
CROSS=arm-linux-gnueabihf-
CC=$(CROSS)gcc
CFLAGS=-O3 -D_LARGEFILE64_SOURCE=1 -DHAVE_HIDDEN
#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
#CFLAGS=-g -DDEBUG
#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
# -Wstrict-prototypes -Wmissing-prototypes
SFLAGS=-O3 -fPIC -D_LARGEFILE64_SOURCE=1 -DHAVE_HIDDEN
LDFLAGS=
TEST_LDFLAGS=-L. libz.a
LDSHARED=$(CC) -shared -Wl,-soname,libz.so.1,--version-script,zlib.map
CPP=$(CC) -E
STATICLIB=libz.a
SHAREDLIB=libz.so
SHAREDLIBV=libz.so.1.2.8
SHAREDLIBM=libz.so.1
LIBS=$(STATICLIB) $(SHAREDLIBV)
AR=$(CROSS)ar
ARFLAGS=rc
RANLIB=$(CROSS)ranlib
LDCONFIG=ldconfig
LDSHAREDLIBC=-lc
TAR=tar
SHELL=/bin/sh
EXE=
#prefix =/usr/local
prefix=../../zlib/install
编译：
make
安装到prefix目录当中：
make install
用tree 显示安装目录如下所示：
install
├── include
│ ├── zconf.h
│ └── zlib.h
├── lib
│ ├── libz.a
│ ├── libz.so -> libz.so.1.2.8
│ ├── libz.so.1 -> libz.so.1.2.8
│ ├── libz.so.1.2.8
│ └── pkgconfig
│ └── zlib.pc
└── share
└── man
└── man3
└── zlib.3
3. 交叉编译dropbear。
解压dropbear-2015.67.tar.bz2
tar jvxf dropbear-2015.67.tar.bz2
cd dropbear-2015.67
配置：
./configure --prefix=../../dropbear/install --with-zlib=../../zlib/install/ CC=arm-linux-gnueabihf-gcc --host=arm-linux
会报如下错误：
configure: error: expected an absolute directory name for --prefix: ../../dropbear/install
因为—prefix需要一个绝对的路径，所以修该成如下进行配置
./configure --prefix=/home/vmuser/sdc/remote_svn/iotx-am335x/MC-183/package/dropbear/install --with-zlib=../../zlib/install/ CC=arm-linux-gnueabihf-gcc --host=arm-linux
默认编译安装：
default compile:
make
make install
自定义编译安装：
counster compile:
make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp"
make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp" install
用tree 显示安装目录如下所示：
install/
├── bin
│ ├── dbclient
│ ├── dropbearconvert
│ ├── dropbearkey
│ └── scp
├── sbin
│ └── dropbear
└── share
└── man
├── man1
│ ├── dbclient.1
│ ├── dropbearconvert.1
│ └── dropbearkey.1
└── man8
└── dropbear.8
4. 测试：
# download dbclient
wget http://192.168.3.88/dropbear/install/bin/dbclient -O /bin/dbclient && chmod +x /bin/dbclient
# download scp
wget http://192.168.3.88/dropbear/install/bin/scp -O /bin/scp && chmod +x /bin/scp
# download dropbearkey
wget http://192.168.3.88/dropbear/install/bin/dropbearkey -O /bin/dropbearkey && chmod +x /bin/dropbearkey
# download dropbearconvert
wget http://192.168.3.88/dropbear/install/bin/dropbearconvert -O /bin/dropbearconvert && chmod +x /bin/dropbearconvert
# download dropbear
wget http://192.168.3.88/dropbear/install/sbin/dropbear -O /bin/dropbear && chmod +x /bin/dropbear
# download libz so
wget http://192.168.3.88/zlib/install/lib/libz.so.1.2.8 -O /lib/libz.so.1.2.8 && chmod +x /lib/libz.so.1.2.8
# create soft ln
ln -s /lib/libz.so.1.2.8 /lib/libz.so
ln -s /lib/libz.so.1.2.8 /lib/libz.so.1
# mkdir /etc/dropbear
mkdir -p /etc/dropbear
cd /etc/dropbear
# generate dropbear_dss_host_key
root@am335x:/etc/dropbear# dropbearkey -t dss -f dropbear_dss_host_key
Generating key, this may take a while...
Public key portion is:
ssh-dss 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@am335x Fingerprint: md5 09:e2:6c:93:39:d0:08:1e:97:64:74:c8:d6:78:97:6e
# generate dropbear_rsa_host_key
root@am335x:/etc/dropbear# dropbearkey -t rsa -f dropbear_rsa_host_key
Generating key, this may take a while...
Public key portion is:
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC5txR31wx+AXiy4nOanuocphD7VYTQa5L1yLmANQVZnZh2itRnuMrsAfSBOkKIOo2UwcK9iyJCWXFmcoLe6acXIeX/mAP4OzgOqi1gLJoBw/y3vmeIzJJP1Qn96iVhZqL1NLjqj863+LNi20WuvYzdKbd13dbTGnE7auDynKLlE+LudSg2MjDLhJ7VZ4tGagoxY4HkRfGgKha2+K7CeCvby29St5QOt8HWjbOBM6MaNqX09GH7W1hpzti39xpZwz8YakPWMgYd6/elBFtVx0tZhg/80xq1HHG5OtDM6Fzo+wtZODb5r2gEBvYPJ+DaX06x9f6WOaWXtKnV5IEu3GF/ root@am335x
Fingerprint: md5 09:0c:bc:c0:c9:85:26:c1:aa:00:4a:0f:7e:23:33:1d
# restart dropbear
killall -9 dropbear
dropbear -p 22 &
