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dbus-proxy.go
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dbus-proxy.go
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// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
// Copyright (C) Felix Geyer <[email protected]>
package main
import (
"fmt"
"os"
"os/exec"
"path"
"strconv"
"strings"
)
func setupDbusProxy(originalSettings settingsStruct) (proxyPipe uintptr, dbusMount mount, cleanupFile string, err error) {
runtimeDir, err := getUserRuntimeDir()
if err != nil {
return
}
proxySocketDir := path.Join(runtimeDir, ".dbus-proxy")
if err = os.MkdirAll(proxySocketDir, 0750); err != nil {
return
}
proxySocketFile, err := os.CreateTemp(proxySocketDir, "session-bus-proxy-")
if err != nil {
return
}
cleanupFile = proxySocketFile.Name()
err = proxySocketFile.Close()
if err != nil {
return
}
hostSocketPath := path.Join(runtimeDir, "bus")
dbusProxyBin, err := exec.LookPath("xdg-dbus-proxy")
if err != nil {
return
}
pipeR, pipeW, err := os.Pipe()
if err != nil {
return
}
// pass pipeW to xdg-dbus-proxy and close it in this process afterwards
if err = clearCloseOnExec(pipeW.Fd()); err != nil {
return
}
defer pipeW.Close()
dbusProxyArgs := []string{"--fd=" + strconv.Itoa(int(pipeW.Fd())), "unix:path=" + hostSocketPath, proxySocketFile.Name(), "--filter"}
// DBus filter explanation: https://bugs.freedesktop.org/show_bug.cgi?id=101902
for _, name := range originalSettings.DbusOwn {
dbusProxyArgs = append(dbusProxyArgs, "--own="+name)
}
for _, name := range originalSettings.DbusTalk {
dbusProxyArgs = append(dbusProxyArgs, "--talk="+name)
}
for _, name := range originalSettings.DbusCall {
dbusProxyArgs = append(dbusProxyArgs, "--call="+name)
}
for _, name := range originalSettings.DbusBroadcast {
dbusProxyArgs = append(dbusProxyArgs, "--broadcast="+name)
}
if originalSettings.Debug {
dbusProxyArgs = append(dbusProxyArgs, "--log")
printCmdArgs := strings.Join(dbusProxyArgs, " ")
fmt.Fprintf(os.Stderr, "Running: dbus-proxy %s\n", printCmdArgs)
}
argsFile, err := getDataFileBytes(append([]byte(strings.Join(dbusProxyArgs, "\x00")), []byte("\x00")...))
if err != nil {
return
}
defer argsFile.Close()
rawMountOptions, err := getDefaultOptions()
if err != nil {
return
}
rawMountOptions.Rw = append(rawMountOptions.Rw, hostSocketPath)
rawMountOptions.Rw = append(rawMountOptions.Rw, proxySocketDir)
rawMountOptions.Ro = append(rawMountOptions.Ro, dbusProxyBin)
mountOptions, err := parseRawMountOptions(rawMountOptions)
if err != nil {
return
}
settings := getDefaultSettings()
settings.Cwd = "/"
settings.Command = []string{dbusProxyBin, "--args=" + strconv.Itoa(int(argsFile.Fd()))}
settings.Network = false
settings.Debug = originalSettings.Debug
_, err = run(settings, mountOptions, os.Environ(), true)
if err != nil {
return
}
dataRead := make([]byte, 1)
bytesRead, err := pipeR.Read(dataRead)
if err != nil {
return
}
if bytesRead != 1 {
err = fmt.Errorf("failed to initialize dbus proxy, syncing failed")
return
}
proxyPipe = pipeR.Fd()
dbusMount = mount{Type: mountTypeBindRw, Path: hostSocketPath, Other: proxySocketFile.Name()}
return
}