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package shim
import (
"encoding/gob"
"errors"
"fmt"
"net"
"os"
"syscall"
"git.ophivana.moe/cat/fortify/internal/verbose"
)
// called in the parent process
func ServeConfig(socket string, payload *Payload, wl string, done chan struct{}) (*net.UnixConn, error) {
var ws *net.UnixConn
if payload.WL {
if f, err := net.DialUnix("unix", nil, &net.UnixAddr{Name: wl, Net: "unix"}); err != nil {
return nil, err
} else {
verbose.Println("connected to wayland at", wl)
ws = f
}
}
if c, err := net.ListenUnix("unix", &net.UnixAddr{Name: socket, Net: "unix"}); err != nil {
return nil, err
} else {
verbose.Println("configuring shim on socket", socket)
if err = os.Chmod(socket, 0777); err != nil {
fmt.Println("fortify: cannot change permissions of shim setup socket:", err)
}
go func() {
var conn *net.UnixConn
if conn, err = c.AcceptUnix(); err != nil {
fmt.Println("fortify: cannot accept connection from shim:", err)
} else {
if err = gob.NewEncoder(conn).Encode(*payload); err != nil {
fmt.Println("fortify: cannot stream shim payload:", err)
return
}
if payload.WL {
// get raw connection
var rc syscall.RawConn
if rc, err = ws.SyscallConn(); err != nil {
fmt.Println("fortify: cannot obtain raw wayland connection:", err)
return
} else {
go func() {
// pass wayland socket fd
if err = rc.Control(func(fd uintptr) {
if _, _, err = conn.WriteMsgUnix(nil, syscall.UnixRights(int(fd)), nil); err != nil {
fmt.Println("fortify: cannot pass wayland connection to shim:", err)
return
}
_ = conn.Close()
// block until shim exits
<-done
verbose.Println("releasing wayland connection")
}); err != nil {
fmt.Println("fortify: cannot obtain wayland connection fd:", err)
}
}()
}
} else {
_ = conn.Close()
}
}
if err = c.Close(); err != nil {
fmt.Println("fortify: cannot close shim socket:", err)
}
if err = os.Remove(socket); err != nil && !errors.Is(err, os.ErrNotExist) {
fmt.Println("fortify: cannot remove dangling shim socket:", err)
}
}()
return ws, nil
}
}
// Try runs shim and stops execution if FORTIFY_SHIM is set.
func Try() {
if s, ok := os.LookupEnv(EnvShim); ok {
shim(s)
}
panic("unreachable")
}
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