traceroute AS path patch

[Rui Paulo]

Hi,
The attached patch ports a traceroute functionality from FreeBSD  
called AS path.
The concept is simple. On each hop we query a whois server to find the  
corresponding hop AS number.

I think it doesn't hurt if we have this functionality.

An example output:
traceroute to freebsd.org (69.147.83.40), 64 hops max, 72 byte packets
...
  7  [AS6453] if-2-1.core1.PV9-Lisbon.teleglobe.net (195.219.187.21)   
35.105 ms  34.008 ms  35.334 ms
  8  [AS6453] 195.219.144.5 (195.219.144.5)  63.880 ms  60.448 ms   
60.809 ms
  9  [AS6453] 195.219.144.10 (195.219.144.10)  138.593 ms  193.709 ms   
173.415 ms
10  [AS7199] if-2-0.core1.NJY-Newark.teleglobe.net (216.6.63.10)   
133.912 ms  134.393 ms  144.071 ms
11  [AS9557] if-3-1.mcore3.NJY-Newark.teleglobe.net (216.6.57.1)   
135.600 ms  144.979 ms  168.247 ms
12  [AS9557] if-12-0-0-741.core4.AEQ-Ashburn.teleglobe.net  
(216.6.57.70)  180.346 ms  138.718 ms  138.927 ms
13  [AS6453] 64.86.85.38 (64.86.85.38)  142.745 ms  143.163 ms   
143.358 ms
14  [AS26085] so-0-0-0.pat2.pao.yahoo.com (216.115.101.130)  252.417  
ms  213.377 ms  212.859 ms
15  [AS26085] ge-0-1-0-p301.pat1.sjc.yahoo.com (216.115.106.147)   
214.709 ms  213.198 ms  235.253 ms
16  [AS26085] g-1-0-0-p160.msr1.sp1.yahoo.com (216.115.107.61)   
219.091 ms
     [AS26085] g-0-0-0-p170.msr2.sp1.yahoo.com (216.115.107.81)   
217.650 ms
     [AS26085] g-1-0-0-p160.msr1.sp1.yahoo.com (216.115.107.61)   
286.376 ms
17  [AS36752] ge-1-45.bas-b2.sp1.yahoo.com (209.131.32.49)  213.747 ms
     [AS36752] ge-1-41.bas-b2.sp1.yahoo.com (209.131.32.33)  274.140 ms
     [AS36752] ge-1-45.bas-b2.sp1.yahoo.com (209.131.32.49)  213.341 ms
18  [AS36752] freebsd.org (69.147.83.40)  214.386 ms  223.515 ms   
212.548 ms


What do you think?

Regards.
--
Rui Paulo
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