authfs: implement p9p.Session

1 files changed, 66 insertions, 0 deletions

diff --git a/back/cmd/authfs/main.go b/back/cmd/authfs/main.go
new file mode 100644
index 0000000..f8618df
--- /dev/null
+++ b/back/cmd/authfs/main.go
@@ -0,0 +1,66 @@
+/*
+This is the authfs daemon. It stores the user database and client
+sessions, and it serves a 9P filesystem for managing them.
+
+User data (usernames and password hashes) are stored on disk. Sessions
+are stored in memory.
+*/
+package main
+
+import (
+	"context"
+	"flag"
+	"log"
+	"net"
+	"os"
+
+	"github.com/docker-archive/go-p9p"
+)
+
+const (
+	defaultNetwork = "unix"
+	defaultAddress = "authfs.sock"
+)
+
+var (
+	network, address string
+
+	outlog = log.New(os.Stdout, "authfs [info]: ", log.LstdFlags)
+	errlog = log.New(os.Stderr, "authfs [error]: ", log.LstdFlags|log.Llongfile)
+)
+
+func main() {
+	flag.StringVar(&network, "net", defaultNetwork, "network transport protocol: {tcp, unix}")
+	flag.StringVar(&address, "addr", defaultAddress, "IP address or Unix socket path to listen on")
+	flag.Parse()
+
+	ln, err := net.Listen(network, address)
+	if err != nil {
+		errlog.Fatal(err)
+	}
+	defer logErr(ln.Close())
+
+	for {
+		if conn, err := ln.Accept(); err == nil {
+			outlog.Println("connected", conn.RemoteAddr())
+			go handle(conn)
+		} else {
+			errlog.Println(err)
+		}
+	}
+}
+
+func handle(conn net.Conn) {
+	defer logErr(conn.Close())
+	ctx := context.Background()
+	handler := p9p.Dispatch(NewSession())
+	if err := p9p.ServeConn(ctx, conn, handler); err != nil {
+		errlog.Printf("%v: %v\n", conn.RemoteAddr(), err)
+	}
+}
+
+func logErr(err error) {
+	if err != nil {
+		errlog.Println(err)
+	}
+}