在Mac Os X上安装Nmap

nmap是一个网络（端口）扫描工具。最基本的用途是这样的：

$ nmap mitnk.com

Starting Nmap 7.00 ( https://nmap.org ) at 2015-11-20 09:32 CST
Nmap scan report for mitnk.com (212.47.241.150)
Host is up (0.30s latency).
rDNS record for 212.47.241.150: 150-241-47-212.rev.cloud.scaleway.com
Not shown: 997 closed ports
PORT    STATE SERVICE
22/tcp  open  ssh
80/tcp  open  http
443/tcp open  https

Nmap done: 1 IP address (1 host up) scanned in 49.03 seconds

今天nmap出了7.0版本，然后从官方网站下载了源码进行安装。 本来很简单的 ./configure && make 就可以了。但因为我系统上的几个小问题，没有成功。

原因有两个

  1. 我想编辑nmap时enable通过brew安装的openssl
  2. 系统的 gcc 被我替换成了最新的5.2.0，而nmap在用一个参数已经有存在了

用brew info openssl查看openssl的信息

$ brew info openssl

...
Generally there are no consequences of this for you. If you build your
own software and it requires this formula, you'll need to add to your
build variables:

    LDFLAGS:  -L/usr/local/opt/openssl/lib
    CPPFLAGS: -I/usr/local/opt/openssl/include

然后告诉make我们要用 /usr/bin/gcc 而不是 /usr/local/bin/gcc

$ CC=/usr/bin/gcc LDFLAGS="-L/usr/local/opt/openssl/lib" CPPFLAGS="-I/usr/local/opt/openssl/include" ./configure
$ make
$ make install

如果你当前用户对 /usr/local 没有写限制的话，最后一行要改为 sudo make install。