Add common cypherpunks.ru prefix for govpn Go package names

[govpn.git] / src / cypherpunks.ru / govpn / egd.go

diff --git a/src/cypherpunks.ru/govpn/egd.go b/src/cypherpunks.ru/govpn/egd.go
new file mode 100644 (file)
index 0000000..04ec87b
--- /dev/null
+++ b/src/cypherpunks.ru/govpn/egd.go
@@ -0,0 +1,56 @@
+/*
+GoVPN -- simple secure free software virtual private network daemon
+Copyright (C) 2014-2016 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package govpn
+
+import (
+       "crypto/rand"
+       "errors"
+       "io"
+       "net"
+)
+
+var (
+       Rand io.Reader = rand.Reader
+)
+
+type EGDRand string
+
+// Read n bytes from EGD, blocking mode.
+func (egdPath EGDRand) Read(b []byte) (int, error) {
+       conn, err := net.Dial("unix", string(egdPath))
+       if err != nil {
+               return 0, err
+       }
+       conn.Write([]byte{0x02, byte(len(b))})
+       read, err := conn.Read(b)
+       if err != nil {
+               conn.Close()
+               return read, err
+       }
+       if read != len(b) {
+               conn.Close()
+               return read, errors.New("Got less bytes than expected from EGD")
+       }
+       conn.Close()
+       return read, nil
+}
+
+func EGDInit(path string) {
+       Rand = EGDRand(path)
+}