win32utils devel - Jun 2008 - Unraveling a protoent struct

I''m spacing - how do I unravel a protent struct pointer?

require ''win32/api''
include Win32

getprotobyname = API.new(''getprotobyname'',
''P'', ''P'', ''ws2_32'')

ptr = getprotobyname.call(''tcp'')

puts "Name: " + # ???
puts "Aliases: " + # ???
puts "Number: " + # ???

Thanks,

Dan

Hi,
----- Original Message ----- 
From: "Daniel Berger" <djberg96 at gmail.com>
To: "Development and ideas for win32utils projects" 
<win32utils-devel at rubyforge.org>
Sent: Sunday, June 08, 2008 1:24 AM
Subject: [Win32utils-devel] Unraveling a protoent struct

> I''m spacing - how do I unravel a protent struct pointer?
>
> require ''win32/api''
> include Win32
>
> getprotobyname = API.new(''getprotobyname'',
''P'', ''P'', ''ws2_32'')
>
> ptr = getprotobyname.call(''tcp'')
>
> puts "Name: " + # ???
> puts "Aliases: " + # ???
> puts "Number: " + # ???
>
Here is a little dirty but working code:

require ''win32/api''
require "windows/msvcrt/buffer"
require ''windows/msvcrt/string''
include Win32
include Windows::MSVCRT::Buffer
include Windows::MSVCRT::String

protent = "\0" * 12
name_buf = "\0" * 256
alias_ptr = "\0" * 256
getprotobyname = API.new(''getprotobyname'',
''P'', ''L'', ''ws2_32'')
ptr = getprotobyname.call(''tcp'')
memcpy(protent,ptr,12)
strcpy(name_buf,protent[0,4].unpack(''L'').first)
memcpy(alias_ptr,protent[4,4].unpack(''L'').first,4)
aliases = []
alias_ptr.unpack("L*").each do |name|
  break if name==0
  alias_buf = "\0"*256
  strcpy(alias_buf,name)
  aliases << alias_buf.strip
end

puts "Name: #{name_buf.strip}"
puts "Aliases: #{aliases}"
puts "Number: #{protent[8,4].unpack(''L'').first}"


Regards,

Park Heesob

> -----Original Message-----
> From: win32utils-devel-bounces at rubyforge.org 
> [mailto:win32utils-devel-bounces at rubyforge.org] On Behalf Of 
> Park Heesob
> Sent: Saturday, June 07, 2008 8:16 PM
> To: Development and ideas for win32utils projects
> Subject: Re: [Win32utils-devel] Unraveling a protoent struct
> 
> Hi,
> ----- Original Message -----
> From: "Daniel Berger" <djberg96 at gmail.com>
> To: "Development and ideas for win32utils projects" 
> <win32utils-devel at rubyforge.org>
> Sent: Sunday, June 08, 2008 1:24 AM
> Subject: [Win32utils-devel] Unraveling a protoent struct
> 
> 
> > I''m spacing - how do I unravel a protent struct pointer?
> >
> > require ''win32/api''
> > include Win32
> >
> > getprotobyname = API.new(''getprotobyname'',
''P'', ''P'', ''ws2_32'')
> >
> > ptr = getprotobyname.call(''tcp'')
> >
> > puts "Name: " + # ???
> > puts "Aliases: " + # ???
> > puts "Number: " + # ???
> >
> Here is a little dirty but working code:
> 
> require ''win32/api''
> require "windows/msvcrt/buffer"
> require ''windows/msvcrt/string''
> include Win32
> include Windows::MSVCRT::Buffer
> include Windows::MSVCRT::String
> 
> protent = "\0" * 12
> name_buf = "\0" * 256
> alias_ptr = "\0" * 256
> getprotobyname = API.new(''getprotobyname'',
''P'', ''L'', ''ws2_32'')
> ptr = getprotobyname.call(''tcp'')
> memcpy(protent,ptr,12)
> strcpy(name_buf,protent[0,4].unpack(''L'').first)
> memcpy(alias_ptr,protent[4,4].unpack(''L'').first,4)
> aliases = []
> alias_ptr.unpack("L*").each do |name|
>   break if name==0
>   alias_buf = "\0"*256
>   strcpy(alias_buf,name)
>   aliases << alias_buf.strip
> end
> 
> puts "Name: #{name_buf.strip}"
> puts "Aliases: #{aliases}"
> puts "Number:
#{protent[8,4].unpack(''L'').first}"
That works, thanks!

Dan


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