| # CUPS Proxy Daemon |
| |
| ## Summary |
| |
| The CUPS Proxy Daemon is responsible for parsing HTTP(S) requests from the VM’s |
| file socket ([`/run/cups_proxy/cups.sock`][1]) and passing that to the `CupsProxyService` |
| in Ash Chrome via Mojo. It also relays the HTTP(S) response generated by `CupsProxyService` |
| back to Plugin VM. |
| |
| The control flow is as follows: |
| |
|  |
| |
| The Mojo IPC channel is [bootstrapped][2] via the `org.chromium.CupsProxyDaemon` D-Bus service. |
| |
| libmicrohttpd is used to parse (and validate) HTTP(S) requests. |
| |
| The HTTP(S) requests are actually IPP(S) requests - validation of the IPP(S) part |
| of the protocol is performed by the CUPS Proxy Service. |
| |
| ## Design docs |
| |
| * Overall design: [go/cups-proxy-daemon] |
| |
| [1]: https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform2/cups_proxy/daemon.cc;drc=713061ea4d4c8d9538b7e893b1acfa3bea2a331d;l=28 |
| [2]: https://source.chromium.org/chromium/chromium/src/+/main:chromeos/dbus/cups_proxy/cups_proxy_client.h |
| [go/cups-proxy-daemon]: http://go/cups-proxy-daemon |
