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msantos / procket

Erlang interface to low level socket operations
http://blog.listincomprehension.com/search/label/procket
BSD 3-Clause "New" or "Revised" License
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Error when trying to ping 127.0.0.1 #9

Closed infospacer closed 11 years ago

infospacer commented 11 years ago

I'm trying to ping using icmp from examples 26> icmp:ping("127.0.0.1").
\ exception error: no function clause matching icmp:icmp(<<8,0,176,193,100,172,0,0,0,0,5,89,0,14,175,9,0,1,155, 119,32,33,34,35,36,37,38,39,...>>) (src/icmp.erl, line 120) in function icmp:loop/1 (src/icmp.erl, line 75)

At the same time trying another address 192.168.20.9 everythig is ok

28> icmp:ping("192.168.20.9"). ok 29> =INFO REPORT==== 31-May-2013::11:07:14 === type: 0 code: 0 checksum: 40081 id: 53808 sequence: 0 payload: <<" !\"#$%&'()*+,-./0123456789:;=>?@ABCDEFGHIJK"> time: 15998

msantos commented 11 years ago

Hey! Thanks for the bug report!

The icmp:ping/1,2 example only checks for ICMP echo reply packets. When you ping localhost, the ICMP socket sees the echo request that you send and the reply.

I modified the example to filter out the echo request packets. To keep things simple, it will still crash if any other ICMP types are seen by the socket.

icmp:icmp(< 119,32,33,34,35,36,37,38,39,...>>)

I guess you obfuscated the error trace?

Thanks again and if you have any more problems or questions, let me know!

infospacer commented 11 years ago

Thank you very much!

Everything works now.