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package app
import (
"errors"
"fmt"
"os"
"path"
"strconv"
"git.ophivana.moe/cat/fortify/dbus"
"git.ophivana.moe/cat/fortify/internal/acl"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/system"
"git.ophivana.moe/cat/fortify/internal/util"
"git.ophivana.moe/cat/fortify/internal/verbose"
)
const (
dbusSessionBusAddress = "DBUS_SESSION_BUS_ADDRESS"
dbusSystemBusAddress = "DBUS_SYSTEM_BUS_ADDRESS"
)
var (
dbusAddress [2]string
dbusSystem bool
)
func (a *App) ShareDBus(dse, dsg *dbus.Config, log bool) {
a.setEnablement(state.EnableDBus)
dbusSystem = dsg != nil
var binPath string
var sessionBus, systemBus [2]string
target := path.Join(system.V.Share, strconv.Itoa(os.Getpid()))
sessionBus[1] = target + ".bus"
systemBus[1] = target + ".system-bus"
dbusAddress = [2]string{
"unix:path=" + sessionBus[1],
"unix:path=" + systemBus[1],
}
if b, ok := util.Which("xdg-dbus-proxy"); !ok {
state.Fatal("D-Bus: Did not find 'xdg-dbus-proxy' in PATH")
} else {
binPath = b
}
if addr, ok := os.LookupEnv(dbusSessionBusAddress); !ok {
verbose.Println("D-Bus: DBUS_SESSION_BUS_ADDRESS not set, assuming default format")
sessionBus[0] = fmt.Sprintf("unix:path=/run/user/%d/bus", os.Getuid())
} else {
sessionBus[0] = addr
}
if addr, ok := os.LookupEnv(dbusSystemBusAddress); !ok {
verbose.Println("D-Bus: DBUS_SYSTEM_BUS_ADDRESS not set, assuming default format")
systemBus[0] = "unix:path=/run/dbus/system_bus_socket"
} else {
systemBus[0] = addr
}
p := dbus.New(binPath, sessionBus, systemBus)
dse.Log = log
verbose.Println("D-Bus: sealing session proxy", dse.Args(sessionBus))
if dsg != nil {
dsg.Log = log
verbose.Println("D-Bus: sealing system proxy", dsg.Args(systemBus))
}
if err := p.Seal(dse, dsg); err != nil {
state.Fatal("D-Bus: invalid config when sealing proxy,", err)
}
ready := make(chan bool, 1)
done := make(chan struct{})
verbose.Printf("Starting session bus proxy '%s' for address '%s'\n", dbusAddress[0], sessionBus[0])
if dsg != nil {
verbose.Printf("Starting system bus proxy '%s' for address '%s'\n", dbusAddress[1], systemBus[0])
}
if err := p.Start(&ready); err != nil {
state.Fatal("D-Bus: error starting proxy,", err)
}
verbose.Println("D-Bus proxy launch:", p)
go func() {
if err := p.Wait(); err != nil {
fmt.Println("warn: D-Bus proxy returned error,", err)
} else {
verbose.Println("D-Bus proxy uneventful wait")
}
if err := os.Remove(target); err != nil && !errors.Is(err, os.ErrNotExist) {
fmt.Println("Error removing dangling D-Bus socket:", err)
}
done <- struct{}{}
}()
// register early to enable Fatal cleanup
state.RegisterDBus(p, &done)
if !<-ready {
state.Fatal("D-Bus: proxy did not start correctly")
}
a.AppendEnv(dbusSessionBusAddress, dbusAddress[0])
if err := acl.UpdatePerm(sessionBus[1], a.UID(), acl.Read, acl.Write); err != nil {
state.Fatal(fmt.Sprintf("Error preparing D-Bus session proxy '%s':", dbusAddress[0]), err)
} else {
state.RegisterRevertPath(sessionBus[1])
}
if dsg != nil {
a.AppendEnv(dbusSystemBusAddress, dbusAddress[1])
if err := acl.UpdatePerm(systemBus[1], a.UID(), acl.Read, acl.Write); err != nil {
state.Fatal(fmt.Sprintf("Error preparing D-Bus system proxy '%s':", dbusAddress[1]), err)
} else {
state.RegisterRevertPath(systemBus[1])
}
}
verbose.Printf("Session bus proxy '%s' for address '%s' configured\n", dbusAddress[0], sessionBus[0])
if dsg != nil {
verbose.Printf("System bus proxy '%s' for address '%s' configured\n", dbusAddress[1], systemBus[0])
}
}
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