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package handshake
import (
"context"
"fmt"
"net"
"time"
"git.samanthony.xyz/hose/key"
"git.samanthony.xyz/hose/util"
)
// send sends the local public box (encryption) key to a remote host.
func send(rhost string) error {
// Load keys from disc.
boxPubKey, sigPubKey, err := loadKeys()
if err != nil {
return err
}
// Send them to the remote host.
return sendKeys(rhost, boxPubKey, sigPubKey)
}
func loadKeys() (key.BoxPublicKey, key.SigPublicKey, error) {
boxPubKey, err := key.LoadBoxPublicKey()
if err != nil {
return key.BoxPublicKey{}, key.SigPublicKey{}, err
}
sigPubKey, err := key.LoadSigPublicKey()
return boxPubKey, sigPubKey, err
}
func sendKeys(rhost string, boxPubKey key.BoxPublicKey, sigPubKey key.SigPublicKey) error {
raddr := net.JoinHostPort(rhost, fmt.Sprintf("%d", port))
util.Logf("connecting to %s...", raddr)
conn, err := dialWithTimeout(network, raddr, timeout)
if err != nil {
return err
}
defer conn.Close()
util.Logf("connected to %s", raddr)
if _, err := conn.Write(boxPubKey[:]); err != nil {
return err
}
if _, err := conn.Write(sigPubKey[:]); err != nil {
return err
}
util.Logf("sent public keys to %s", rhost)
return nil
}
func dialWithTimeout(network, address string, timeout time.Duration) (net.Conn, error) {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
for {
select {
case <-ctx.Done(): // timeout.
return nil, fmt.Errorf("dial %s %s: connection refused", network, address)
default:
}
conn, err := net.Dial(network, address)
if err == nil {
return conn, nil
}
time.Sleep(retryInterval)
}
}
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