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