centos安装netcat工具及测试
netcat是网络工具中的瑞士军刀，它能通过TCP和UDP在网卡中读写数据。通过与其他工具结合和重定向，你可以在脚本中以多种方式使用它。使用natcat命令所能完成的事情令人惊讶。
netcat所做的就是在两台电脑之间简历连接并返回两个数据流，在这之后所能作的事就看你的想法了。你能建立一个服务器，传输文件，与朋友聊天，传输流媒体或者用它作为其他协议的独立客户端。
1.下载
- $ wget https://sourceforge.net/projects/netcat/files/netcat/0.7.1/netcat-0.7.1.tar.gz<span style="font-family:Arial, Helvetica, sans-serif;padding:0px;color:rgb(63,63,63);font-size:14px;text-align:left;background-color:rgb(255,255,255);"></span>
如果下载不成功，请自行前往此地址下载：http://netcat.sourceforge.net/download.php
2.解压
- $ sudo tar -zxvf netcat-0.7.1.tar.gz -C /usr/local
查看解压后的文件
- $ cd /user/local/study
- $ ls
- netcat-0.7.1 php
- $ sudo mv netcat-0.7.1 netcat
- $ ls
- netcat php
netcat-0.7.1就是解压后的目录 将其重命名为netcat
3.切换到解压后的目录，查看编译配置文件
- $ cd /use/local/netcat
- $ ./configure
4.编译安装
- $ make && make install
5.配置
切换到/etc目录
编辑etc/profile；加入
export NETCAT_HOME=/usr/local/netcat-0.7.1
export PATH=$PATH:$NETCAT_HOME/bin
6.测试
- nc -help 或者 netcat -help
- GNU netcat 0.7.1, a rewrite of the famous networking tool.
- Basic usages:
- connect to somewhere: nc [options] hostname port [port] ...
- listen for inbound: nc -l -p port [options] [hostname] [port] ...
- tunnel to somewhere: nc -L hostname:port -p port [options]
- Mandatory arguments to long options are mandatory for short options too.
- Options:
- -c, --close close connection on EOF from stdin
- -e, --exec=PROGRAM program to exec after connect
- -g, --gateway=LIST source-routing hop point[s], up to 8
- -G, --pointer=NUM source-routing pointer: 4, 8, 12, ...
- -h, --help display this help and exit
- -i, --interval=SECS delay interval for lines sent, ports scanned
- -l, --listen listen mode, for inbound connects
- -L, --tunnel=ADDRESS:PORT forward local port to remote address
- -n, --dont-resolve numeric-only IP addresses, no DNS
- -o, --output=FILE output hexdump traffic to FILE (implies -x)
- -p, --local-port=NUM local port number
- -r, --randomize randomize local and remote ports
- -s, --source=ADDRESS local source address (ip or hostname)
- -t, --tcp TCP mode (default)
- -T, --telnet answer using TELNET negotiation
- -u, --udp UDP mode
- -v, --verbose verbose (use twice to be more verbose)
- -V, --version output version information and exit
- -x, --hexdump hexdump incoming and outgoing traffic
- -w, --wait=SECS timeout for connects and final net reads
- -z, --zero zero-I/O mode (used for scanning)
- Remote port number can also be specified as range. Example: '1-1024'
如上即安装成功；
使用swoole写了一个udp的连接，测试
- $ netcat -u 127.0.0.1 5999
- hello
- Serverhello
- $ nc -u 127.0.0.1 5999
- hello
- Serverhello
