ip - 使用 netcat 获取我的公共(public) IP

Question

我有一个非常基本的 Linux 服务器，在 IP 摄像机 (Busybox) 上运行。我想获取该摄像机的公共(public) IP，它位于路由器后面。它没有“wget”也没有“traceroute”，“ping”只是回答“alive”或“not alive”...

唯一可用的是基本的“netcat”:

nc
BusyBox v1.1.3 (2009.12.07-16:16+0000) multi-call binary
Usage: nc [OPTIONS] [IP] [port]
Netcat opens a pipe to IP:port
Options:
        -l              listen mode, for inbound connects
        -p PORT         local port number
        -i SECS         delay interval for lines sent
        -w SECS         timeout for connects and final net reads
        -4              Use IPv4 (default)
        -6              Use IPv6
        -D DSCP         set IP DSCP field
        -P PRIO         set VLAN user-priority

如果我的 ISP 允许传出 HTTP，是否可以使用 netcat 从 www.obtainip.com 或类似网站获取公共(public) IP 响应？

非常好，非常感谢你们两个，因为我对 nc 一点都不满意。

这里有两种工作方式:

echo "GET /automation/n09230945.asp HTTP/1.0" > http_req2.txt
echo "Host: www.whatismyip.com" >> http_req2.txt
echo "" >> http_req2.txt
echo "" >> http_req2.txt
IP2=$(cat http_req2.txt | nc www.whatismyip.com 80 | tail -n 1)
echo $IP2
YEAH !

还有更奇怪的，但是......它也有效:

echo "GET / HTTP/1.0" > http_request.txt
echo "Host: www.whatismyip.com" >> http_request.txt
echo "User-Agent: netcat" >> http_request.txt
echo "Referer: http://www.whatismyip.com/" >> http_request.txt
echo "" >> http_request.txt
echo "" >> http_request.txt
IP=$(cat http_request.txt | nc www.whatismyipaddress.com 80 | tail -n 1)
echo $IP
YEAH again!

编辑当然，这可以像建议的那样更好地编写脚本:

echo -e "GET /automation/n09230945.asp HTTP/1.0\n"Host: www.whatismyip.com\n\n" | nc www.whatismyipaddress.com 80 | tail -n 1

Answer 1

由于 whatismyip.com 的自动化功能下降，这里有一个替代方案:

$ echo GET / | nc icanhazip.com 80

...这将输出你的IP。