replace lsof to platform dependent method

[shirou]

#142 , #143 are related to using lsof to get Network connection info.

To replace lsof, we needs at least these functions. inet_ntop porting, sysctl decode functions, and so on are little bit heavy to implement. I will update this issue step by step.

• [x] Linux (see #169)
  • [x] getting inode list from processes
  • [x] porting socket.inet_ntop to pure golang (linux struct)
  • [x] IPv6
  • [x] Unix Pipe
• [x] windows
  • [x] needs research
  • [x] rtlIpv4AddressToStringA
  • [x] rtlIpv6AddressToStringA
  • [x] getExtendedTcpTable
• [ ] darwin
  • [ ] proc_pidinfo and retrieve proc_fdtype
  • [ ] inet_ntop
• [ ] freebsd
  • [ ] sysctl net.inet.tcp.pcblist for TCP
  • [ ] sysctl net.inet.udp.pcblist for UDP
  • [ ] sysctl net.local.stream.pcblist for socket stream
  • [ ] sysctl net.local.dgram.pcblist for socket dgram
  • [ ] porting inet_ntop to pure golang (freebsd struct)
  • [ ] porting kinfo_file

[vrecan]

:+1: great to see that you are taking this on!

[sparrc]

looking forward to this, thanks for your work @shirou!

[shirou]

OK. now I have implemented linux version at #169. The output is same as psutil, but more tests are required.

[shirou]

FreeBSD

sysctl net.inet.tcp.pcblist returnes xtcpcb struct. But since it is complicated to parse to golang struct, time should be required.

Darwin

To get NetConnections, proc_pidinfo() is required and it seems to invoke by only CGO. I am thinking net is also use CGO or not. Or, the net.inet.tcp.pcblist is exists on Darwin also, the FreeBSD code may be used on Darwin, too. I will challenge after FreeBSD.

windows

not yet...

v2 migration

It takes a time to implement, I think prioritize v2.

[NullSoldier]

Is this dead in the water? I'm seeing flakiness with using lsof where the command never finishes.

[shirou]

@NullSoldier what platform do you want to replace lsof?