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login.go
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login.go
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// Copyright © 2018 Joel Rebello <joel.rebello@booking.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package bmclogin
import (
"errors"
"fmt"
"log"
"net"
"os"
"time"
"github.com/bmc-toolbox/bmclib/devices"
"github.com/bmc-toolbox/bmclib/discover"
)
var (
debug bool
backoff int
interrupt bool
errUnrecognizedDevice = errors.New("Unrecognized device")
errInterrupted = errors.New("Received interrupt during connection setup")
)
// Params are attributes set by callers to login to the BMC
type Params struct {
IpAddresses []string //IPs - since chassis may have more than a single IP.
Credentials []map[string]string //A slice of username, passwords to login with.
CheckCredential bool //Validates the credential works - this is only required for http(s) connections.
Retries int //The number of times to retry a credential
StopChan <-chan struct{} //If the caller decides to pass this channel, when its closed, we return to the caller.
doneChan chan struct{} //This channel is closed to indicate other internal routines spawned to close.
}
type LoginInfo struct {
FailedCredentials []map[string]string //The credentials that failed.
WorkingCredentials map[string]string //The credentials that worked.
ActiveIpAddress string //The IP that we could login into and is active.
Attempts int //The number of login attempts.
}
// Login() carries out login actions.
// nolint: gocyclo
func (p *Params) Login() (connection interface{}, loginInfo LoginInfo, err error) {
if os.Getenv("DEBUG_BMCLOGIN") == "1" {
debug = true
}
if p.Retries == 0 {
p.Retries = 1
}
p.doneChan = make(chan struct{})
if p.StopChan != nil {
go func() {
select {
case <-p.StopChan:
interrupt = true
case <-p.doneChan:
return
}
}()
}
defer close(p.doneChan)
//for each IpAddress
for _, ip := range p.IpAddresses {
if ip == "" {
continue
}
hostreachable, _ := p.IsHostReachable(ip, 443)
if !hostreachable {
log.Printf("Host %s is not reachable at port 443", ip)
continue
}
//for credential map in slice
for _, credentials := range p.Credentials {
//for each credential k, v
for user, pass := range credentials {
backoff = 0
//for each retry attempt
for t := 0; t <= p.Retries; t++ {
if interrupt {
return connection, loginInfo, errInterrupted
}
time.Sleep(time.Duration(backoff) * time.Second)
loginInfo.Attempts += 1
connection, ipInactive, err := p.attemptLogin(ip, user, pass)
if debug {
log.Printf("DEBUG_BMCLOGIN: Login attempt. IP: %s, User: %s, Pass: %s, Attempt: %d, Err: %s",
ip, user, pass, loginInfo.Attempts, err)
}
if err == errUnrecognizedDevice {
return connection, loginInfo, err
}
//if the IP is not active, break out of this loop
//to try credentials on the next IP.
if ipInactive {
//if we're able to login to asset that has a single IP address,
if len(p.IpAddresses) == 1 {
loginInfo.WorkingCredentials = map[string]string{user: pass}
return connection, loginInfo, err
}
break
}
if err == nil {
if debug {
log.Printf("DEBUG_BMCLOGIN: Login success. IP: %s, User: %s, Pass: %s, Attempt: %d, Err: %s",
ip, user, pass, loginInfo.Attempts, err)
}
loginInfo.ActiveIpAddress = ip
loginInfo.WorkingCredentials = map[string]string{user: pass}
return connection, loginInfo, err
}
loginInfo.FailedCredentials = append(loginInfo.FailedCredentials, map[string]string{user: pass})
backoff = loginInfo.Attempts * 10
if debug {
log.Printf("DEBUG_BMCLOGIN: Login failed. Backoff: %dsecs IP: %s, User: %s, Pass: %s, Attempt: %d, Err: %s", backoff, ip, user, pass, loginInfo.Attempts, err)
}
}
}
}
}
return connection, loginInfo, errors.New("All attempts to login failed.")
}
// attemptLogin tries to scanAndConnect
func (p *Params) attemptLogin(ip string, user string, pass string) (connection interface{}, ipInactive bool, err error) {
// Scan BMC type and connect
connection, err = discover.ScanAndConnect(ip, user, pass)
if err != nil {
return connection, ipInactive, errors.New("ScanAndConnect attempt unsuccessful.")
}
// Don't attempt to login via web with credentials.
if !p.CheckCredential {
return connection, ipInactive, err
}
switch connection.(type) {
case devices.Bmc:
bmc := connection.(devices.Bmc)
err := bmc.CheckCredentials()
if err != nil {
return connection, ipInactive, errors.New(
fmt.Sprintf("BMC login attempt failed, account: %s", user))
}
//successful login.
return connection, ipInactive, nil
case devices.Cmc:
chassis := connection.(devices.Cmc)
err := chassis.CheckCredentials()
if err != nil {
return connection, ipInactive, errors.New(
fmt.Sprintf("Chassis login attempt failed, account: %s", user))
}
//A chassis has one or more controllers
//We return true if this controller is active.
if !chassis.IsActive() {
ipInactive = true
return connection, ipInactive, nil
}
return connection, ipInactive, nil
default:
return connection, ipInactive, errUnrecognizedDevice
}
//we won't ever end up here
//return connection, ipInactive, errors.New(
// fmt.Sprintf("Unable to login"))
}
// Check if Host is Reachable
func (p *Params) IsHostReachable(host string, port int) (hostreachable bool, err error) {
timeout := 30 * time.Second
target := fmt.Sprintf("%s:%d", host, port)
conn, err := net.DialTimeout("tcp", target, timeout)
if err != nil {
return false, err
}
if conn != nil {
conn.Close()
return true, nil
}
return false, err
}