// Writes data to the socket of the specified connection
func sendOut(user *Admin, query map[string]interface{}) error {
enc := bencode.NewEncoder()
enc.Encode(query)
_, err := io.WriteString(user.Conn, string(enc.Bytes))
if err != nil {
return err
}
return nil
}
func SendCmd(user *Admin, cmd string, args map[string]interface{}) (response map[string]interface{}, err error) {
query := make(map[string]interface{})
enc := bencode.NewEncoder()
// Generate a unique transaction ID for this request.
// This tells Reader which channel to send the data back to us on.
txid := strconv.FormatInt(rand.Int63(), 10) //randInt(10, 15)
query["txid"] = txid
// Check if we need to use authentication for this command.
if cmd == "ping" || cmd == "cookie" {
query["q"] = cmd
} else {
//Request a cookie
cookie, err := ReqCookie(user)
if err != nil {
return nil, err
}
query["q"] = "auth"
query["aq"] = cmd
query["cookie"] = cookie
if args != nil {
query["args"] = args
}
//Generate the first hash we need
query["hash"] = sha256hash(user.Password + cookie)
//Encode the query and get the final hash
enc.Encode(query)
data := string(enc.Bytes)
query["hash"] = sha256hash(data)
}
//Re-encode the query with the new hash
enc = bencode.NewEncoder()
enc.Encode(query)
// If we are telling cjdns to exit, then we will not get a response, so there is no need to wait
if cmd != "Core_exit" {
//create the channel to receive data back on
rChan := make(chan map[string]interface{}, 1) // use buffered channel to avoid blocking reader.
user.Mu.Lock()
user.Channels[txid] = rChan
user.Mu.Unlock()
// remove channel from map no matter how this function exits.
defer func() {
user.Mu.Lock()
delete(user.Channels, txid)
user.Mu.Unlock()
}()
//Send the query
_, err = io.WriteString(user.Conn, string(enc.Bytes))
if err != nil {
return nil, err
}
output, ok := <-rChan
if !ok {
return nil, fmt.Errorf("Socket closed")
}
// If an error field exists, and we have an error, return it
if _, ok := response["error"]; ok {
if response["error"] != "none" {
err = fmt.Errorf(response["error"].(string))
return
}
}
return output, nil
}
//Send the query
_, err = io.WriteString(user.Conn, string(enc.Bytes))
if err != nil {
return nil, err
}
return make(map[string]interface{}), nil
}