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  • Committer: Teddy Hogeborn
  • Date: 2024-11-17 16:53:00 UTC
  • mto: This revision was merged to the branch mainline in revision 412.
  • Revision ID: teddy@recompile.se-20241117165300-02hxm96s8cj9528e
mandos: Avoid closing configured server network socket

If we are passed a pre-created created network socket as a file
descriptor, we must avoid later closing it (when stdin, stdout and
stderr are dup2()ed over with /dev/null) by making sure that the
network file descriptor is not 0, 1, or 2, by creating a new file
descriptor if necessary.

However, when we create a new file descriptor we must check that the
new file descriptor is not 0, 1, or 2 either, and try again until we
get a suitable file descriptor.

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Lines of Context:
 
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<!DOCTYPE busconfig PUBLIC
 
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 "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
 
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 "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
 
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<busconfig>
 
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  <policy group="_mandos">
 
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    <allow own="se.bsnet.fukt.Mandos"/>
 
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    <allow send_destination="se.bsnet.fukt.Mandos"/>
 
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    <allow receive_sender="se.bsnet.fukt.Mandos"/>
 
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    <allow own="se.recompile.Mandos"/>
 
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    <allow send_destination="se.recompile.Mandos"/>
 
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    <allow receive_sender="se.recompile.Mandos"/>
 
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  </policy>
 
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  <policy user="root">
 
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    <allow own="se.bsnet.fukt.Mandos"/>
 
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    <allow send_destination="se.bsnet.fukt.Mandos"/>
 
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    <allow receive_sender="se.bsnet.fukt.Mandos"/>
 
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    <allow own="se.recompile.Mandos"/>
 
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    <allow send_destination="se.recompile.Mandos"/>
 
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    <allow receive_sender="se.recompile.Mandos"/>
 
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  </policy>
 
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</busconfig>