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qrexec: clarify when pipes and when vchan is used, add note about loopback vchan

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QubesOS/qubes-issues#4583
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Marek Marczykowski-Górecki 2018-12-08 22:37:44 +01:00
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services/qrexec3.md
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@ -361,8 +361,9 @@ qrexec v2, see [here](/doc/qrexec2/#qubes-rpc-internals).*)
Qrexec framework consists of a number of processes communicating with each
other using common IPC protocol (described in detail below). Components
residing in the same domain use pipes as the underlying transport medium,
while components in separate domains use vchan link.
residing in the same domain (`qrexec-client-vm` to `qrexec-agent`, `qrexec-client` to `qrexec-daemon`) use pipes as the underlying transport medium,
while components in separate domains (`qrexec-daemon` to `qrexec-agent`, data channel between `qrexec-agent`s) use vchan link.
Because of [vchan limitation](https://github.com/qubesos/qubes-issues/issues/951), it is not possible to establish qrexec connection back to the source domain.
## Dom0 tools implementation ##