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POGet my public IP using netcat
 

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    <p>I have a very basic Linux server running on an IP camera (Busybox). I'd like to get the public IP of that camera, which is located behind a router. It has no "wget" nor "traceroute", and "ping" is just answering "alive" or "not alive"...</p> <p>The only one available is a basic "netcat" :</p> <pre><code>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 </code></pre> <p>Provided my ISP allows outgoing HTTP, is it possible to use netcat in order to get the public IP response from a site like www.obtainip.com or similar ?</p> <p>GREAT and many thanks to both of you guys as I did not feel comfortable with nc at all.</p> <p>Here are the 2 working ways :</p> <pre><code>echo "GET /automation/n09230945.asp HTTP/1.0" &gt; http_req2.txt echo "Host: www.whatismyip.com" &gt;&gt; http_req2.txt echo "" &gt;&gt; http_req2.txt echo "" &gt;&gt; http_req2.txt IP2=$(cat http_req2.txt | nc www.whatismyip.com 80 | tail -n 1) echo $IP2 YEAH ! </code></pre> <p>and more strange but... it also works :</p> <pre><code>echo "GET / HTTP/1.0" &gt; http_request.txt echo "Host: www.whatismyip.com" &gt;&gt; http_request.txt echo "User-Agent: netcat" &gt;&gt; http_request.txt echo "Referer: http://www.whatismyip.com/" &gt;&gt; http_request.txt echo "" &gt;&gt; http_request.txt echo "" &gt;&gt; http_request.txt IP=$(cat http_request.txt | nc www.whatismyipaddress.com 80 | tail -n 1) echo $IP YEAH again! </code></pre> <p>EDIT Of course, this can be scripted better like suggested :</p> <pre><code>echo -e "GET /automation/n09230945.asp HTTP/1.0\n"Host: www.whatismyip.com\n\n" | nc www.whatismyipaddress.com 80 | tail -n 1 </code></pre>
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    2. COhum I can't install wget or curl otherwise I'd have loved doing that.
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