[NSE] errors: path-mtu, dns-cache-snoop, and firewalk

[Ron <ron () skullsecurity net>]

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Just some error I'm seeing on a larger scan. 


./scripts/path-mtu.nse:332: error while sending: Message too long (errno 90)
stack traceback:
        [C]: in function 'ip_send'
        ./scripts/path-mtu.nse:332: in function <./scripts/path-mtu.nse:292>
        (tail call): ?


./nselib/strict.lua:65: variable 'host' is not declared
stack traceback:
        [C]: in function 'error'
        ./nselib/strict.lua:69: in function <./nselib/strict.lua:60>
        ./nselib/strict.lua:65: in function <./nselib/strict.lua:60>
        ./nselib/dns.lua:186: in function <./nselib/dns.lua:163>
        (tail call): ?
        ./scripts/dns-cache-snoop.nse:164: in function 'nonrecursive_mode'
        ./scripts/dns-cache-snoop.nse:241: in function <./scripts/dns-cache-snoop.nse:223>
        (tail call): ?


./scripts/firewalk.nse:291: attempt to concatenate local 'gateway' (a nil value)
stack traceback:
        ./scripts/firewalk.nse:291: in function 'ttlmetric'
        ./scripts/firewalk.nse:386: in function <./scripts/firewalk.nse:381>
        (tail call): ?


Ron
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