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package common
import (
"errors"
"fmt"
"time"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/mitchellh/multistep"
"golang.org/x/crypto/ssh"
)
// SSHHost returns a function that can be given to the SSH communicator
// for determining the SSH address based on the instance DNS name.
func SSHHost(e *ec2.EC2, private bool) func(multistep.StateBag) (string, error) {
return func(state multistep.StateBag) (string, error) {
for j := 0; j < 2; j++ {
var host string
i := state.Get("instance").(*ec2.Instance)
if i.VpcId != nil && *i.VpcId != "" {
if i.PublicIpAddress != nil && *i.PublicIpAddress != "" && !private {
host = *i.PublicIpAddress
} else {
host = *i.PrivateIpAddress
}
} else if i.PublicDnsName != nil && *i.PublicDnsName != "" {
host = *i.PublicDnsName
}
if host != "" {
return host, nil
}
r, err := e.DescribeInstances(&ec2.DescribeInstancesInput{
InstanceIds: []*string{i.InstanceId},
})
if err != nil {
return "", err
}
if len(r.Reservations) == 0 || len(r.Reservations[0].Instances) == 0 {
return "", fmt.Errorf("instance not found: %s", *i.InstanceId)
}
state.Put("instance", &r.Reservations[0].Instances[0])
time.Sleep(1 * time.Second)
}
return "", errors.New("couldn't determine IP address for instance")
}
}
// SSHConfig returns a function that can be used for the SSH communicator
// config for connecting to the instance created over SSH using the generated
// private key.
func SSHConfig(username string) func(multistep.StateBag) (*ssh.ClientConfig, error) {
return func(state multistep.StateBag) (*ssh.ClientConfig, error) {
privateKey := state.Get("privateKey").(string)
signer, err := ssh.ParsePrivateKey([]byte(privateKey))
if err != nil {
return nil, fmt.Errorf("Error setting up SSH config: %s", err)
}
return &ssh.ClientConfig{
User: username,
Auth: []ssh.AuthMethod{
ssh.PublicKeys(signer),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}, nil
}
}
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