Porting the remote connection tool dropbear under ARM linux

Original address: http://www.cnblogs.com/NickQ/p/9010529.html

port zlib

Download address: https://github.com/madler/zlib/archive/v1.2.10.tar.gz
Get zlib and extract it

wget https://github.com/madler/zlib/archive/v1.2.10.tar.gz -O zlib-1.2.10.tar.gz
tar -zxvf zlib-1.2.10.tar.gz

Generate Makefile

./configure --prefix=/usr/local/zlib --static

Edit Makefile

CC=/opt/xtools/arm920t/bin/arm-linux-gcc
LDSHARED=/opt/xtools/arm920t/bin/arm-linux-gcc
CPP=/opt/xtools/arm920t/bin/arm-linux-gcc -E
AR=/opt/xtools/arm920t/bin/arm-linux-ar
prefix =`pwd`/install

Create installation folder

mkdir install

cross compile

make && make install

porting dropbear

Download address: https://matt.ucc.asn.au/dropbear/releases/dropbear-2016.74.tar.bz2
Get and unzip

wget https://matt.ucc.asn.au/dropbear/releases/dropbear-2016.74.tar.bz2
tar -xjf dropbear-2016.74.tar.bz2

Create installation folder

cd ./dropbear-2016.74
mkdir install

Generate Makefile

./configure --prefix=`pwd`/install --with-zlib=`pwd`/../zlib-1.2.10/install CC=/opt/xtools/arm920t/bin/arm-linux-gcc --host=arm

Compile and install

make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp"
make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp" install

generated file tree

[root@XQLY install]$ tree ./
./
├── bin
│   ├── dbclient
│   ├── dropbearconvert
│   ├── dropbearkey
│   └── scp
├── sbin
│   └── dropbear
└── share
    └── man
        ├── man1
        │   ├── dbclient.1
        │   ├── dropbearconvert.1
        │   └── dropbearkey.1
        └── man8
            └── dropbear.8

Package the generated files

tar -czf dropbear.nick.tar.gz ./install

The development board downloads and decompresses this package, and puts bin and sbin in the /usr/sbin path. ( remember to give executable permission )

Configure dropbear, generate rsa, dss keys

mkdir /etc/dropbear
dropbearkey -t dss -f /etc/dropbear/dropbear_dss_host_key
dropbearkey -t rsa -s 4096 -f /etc/dropbear/dropbear_rsa_host_key

add startup

vim /etc/init.d/S00_dropbear
添加 /usr/sbin/dropbear -R

test

/etc/init.d/S00_dropbear

other

closure

killall dropbear

View progress

[root@NickQ_fl2440 ~]# ps
  PID USER       VSZ STAT COMMAND
    1 root      2204 S    {linuxrc} init
    2 root         0 SW   [kthreadd]
    
省略部分内核进程    
    
  988 root         0 SW<  [kpsmoused]
 1009 root         0 SWN  [jffs2_gcd_mtd2]
 1020 root      2180 S    /usr/sbin/dropbear -R
 1026 root      2208 S    -sh
 1027 root      2204 S    /sbin/syslogd -n
 1028 root      2204 S    /sbin/klogd -n
 1031 root      2208 R    ps

Check port listening status

[root@NickQ_fl2440 ~]# netstat -tlnp
 Active Internet connections (only servers)
 Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
 tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1020/dropbear
 tcp        0      0 :::22

problems encountered

Connect using SecureCRT, prompt

The remote system refused the connection.

In the end, it was found that the IP set by SecureCRT was incorrect. (It's almost like I'm crying stupidly) As shown in the
figure , the
development board IP:

IP set by SecureCRT: