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package dbus
import (
"errors"
"os"
"os/exec"
"strings"
"sync"
)
// Proxy holds references to a xdg-dbus-proxy process, and should never be copied.
// Once sealed, configuration changes will no longer be possible and attempting to do so will result in a panic.
type Proxy struct {
cmd *exec.Cmd
statP [2]*os.File
argsP [2]*os.File
address [2]string
path string
wait *chan error
read *chan error
ready *chan bool
seal *string
lock sync.RWMutex
}
func (p *Proxy) String() string {
if p.cmd != nil {
return p.cmd.String()
}
if p.seal != nil {
return *p.seal
}
return "(unsealed dbus proxy)"
}
// Seal seals the Proxy instance.
func (p *Proxy) Seal(c *Config) error {
p.lock.Lock()
defer p.lock.Unlock()
if p.seal != nil {
panic("dbus proxy sealed twice")
}
args := c.Args(p.address[0], p.address[1])
seal := strings.Builder{}
for _, arg := range args {
// reject argument strings containing null
for _, b := range arg {
if b == '\x00' {
return errors.New("argument contains null")
}
}
// write null terminated argument
seal.WriteString(arg)
seal.WriteByte('\x00')
}
v := seal.String()
p.seal = &v
return nil
}
// New returns a reference to a new unsealed Proxy.
func New(binPath, address, path string) *Proxy {
return &Proxy{path: binPath, address: [2]string{address, path}}
}
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