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func.go
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func.go
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package main
import (
"encoding/json"
"fmt"
"golang.org/x/crypto/ssh"
"io/ioutil"
"net/http"
"net/url"
"os"
"os/exec"
re "regexp"
s "strings"
nc "github.com/Juniper/go-netconf/netconf"
nrgo "github.com/newrelic/go-agent/v3/newrelic"
log "github.com/sirupsen/logrus"
)
func getLastState(stateFile string) State {
var state State
stateJSON, err := ioutil.ReadFile(stateFile)
if err != nil {
log.Fatalf("Can't open state file %s: %v", stateFile, err)
}
err = json.Unmarshal(stateJSON, &state)
if err != nil {
log.Fatalf("Can't unmarshal state file %s: %v", stateFile, err)
}
return state
}
func writeState(stateFile string, state State) {
jsonState, err := json.MarshalIndent(state, "", " ")
if err != nil {
errMsg := fmt.Sprintf("Can't marshal current state to JSON: %v", err)
logBuf = append(logBuf, LogEnt{Message: errMsg, Level: "Error"})
log.Error(errMsg)
return
}
err = ioutil.WriteFile(stateFile, jsonState, 0600)
if err != nil {
errMsg := fmt.Sprintf("Error writing state to %s: %v", stateFile, err)
logBuf = append(logBuf, LogEnt{Message: errMsg, Level: "Error"})
log.Error(errMsg)
}
}
func ncClient(router RouterConfig) (*nc.Session, error) {
key, err := ioutil.ReadFile(router.SshKeyFile)
if err != nil {
log.Fatalf("%s: can't open: %v", router.SshKeyFile, err)
}
signer, err := ssh.ParsePrivateKey(key)
if err != nil {
log.Fatalf("%s: can't parse: %v", router.SshKeyFile, err)
}
sshConfig := &ssh.ClientConfig{
User: router.Username,
Auth: []ssh.AuthMethod{ssh.PublicKeys(signer)},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
sess, err := nc.DialSSH(router.Hostname, sshConfig)
if err != nil {
log.Error(err)
return nil, err
}
return sess, nil
}
func tunnelBrokerUpdate(tbConfig TunnelBrokerConfig, slackWebHook string) {
var (
tx *nrgo.Transaction
seg *nrgo.Segment
)
if nrApp != nil {
tx = nrApp.StartTransaction("tunnelBrokerUpdate")
defer tx.End()
seg = nrgo.StartSegment(tx, "HTTP GET to update")
}
resp, err := http.Get(fmt.Sprintf(tbConfig.UpdateUrl, tbConfig.Username, tbConfig.Password, tbConfig.TunnelId))
if nrApp != nil {
seg.End()
}
defer resp.Body.Close()
// config.LogActions
if err == nil {
printAddLogEnt("Updated IPv4 endpoint registered with IPv6 tunnel broker", "Info", slackWebHook)
} else {
printAddLogEnt(fmt.Sprintf("Error updating IPv6 tunnel: %v", err), "Error", slackWebHook)
}
}
func jGetConfig(source, filter string) string {
rstr := "<get-config><source><" + source + "/></source>"
if len(filter) > 0 {
rstr += fmt.Sprintf("<filter><configuration>%s</configuration></filter>", filter)
}
log.Debugf(rstr + "</get-config>")
return rstr + "</get-config>"
}
func jSetConfig(target, updateXML string) string {
updateXML = s.Replace(updateXML, "\n", "{NEWLINE}", -1)
updateXML = globalRegex["loadConfigFragment"].ReplaceAllString(updateXML, "<config><configuration>$1</configuration></config>")
updateXML = globalRegex["reNewline"].ReplaceAllString(updateXML, "\n")
return "<edit-config><default-operation>merge</default-operation><target><" + target + "/></target>" + updateXML + "</edit-config>"
}
func routerPubIPUpdate(router RouterConfig, newIP, slackWebHook string) bool {
var (
tx *nrgo.Transaction
seg *nrgo.Segment
)
ncSess, err := ncClient(router)
if err != nil {
return false
}
defer ncSess.Close()
if nrApp != nil {
tx = nrApp.StartTransaction("routerPubIPUpdate")
defer tx.End()
seg = nrgo.StartSegment(tx, "Get ip-0/0/0 config")
}
ifXML, err := ncSess.Exec(nc.RawMethod(jGetConfig("running", "<interfaces><interface><name>ip-0/0/0</name></interface></interfaces>")))
log.Debugf(">> %s", ifXML)
if nrApp != nil {
seg.End()
}
if err != nil {
printAddLogEnt(fmt.Sprintf("NetConf exec(get-config) failed: %v", err), "Error", slackWebHook)
return false
}
if nrApp != nil {
seg = nrgo.StartSegment(tx, "Update ip-0/0/0 tunnel source(s)")
}
updateXML := globalRegex["tunnelSource"].ReplaceAllString(ifXML.Data, "${1}"+newIP)
if nrApp != nil {
seg.End()
}
if nrApp != nil {
seg = nrgo.StartSegment(tx, "Lock router configuration")
}
_, err = ncSess.Exec(nc.MethodLock("candidate"))
if nrApp != nil {
seg.End()
}
if err != nil {
printAddLogEnt(fmt.Sprintf("NetConf exec(lock) failed: %v", err), "Error", slackWebHook)
// sleep
return false
}
if nrApp != nil {
seg = nrgo.StartSegment(tx, "Send ip-0/0/0 config update")
}
_, err = ncSess.Exec(nc.RawMethod(jSetConfig("candidate", updateXML)))
if nrApp != nil {
seg.End()
}
if err != nil {
printAddLogEnt(fmt.Sprintf("NetConf exec(edit-config) failed: %v", err), "Error", slackWebHook)
log.Error(jSetConfig("candidate", updateXML))
_, err = ncSess.Exec(nc.MethodUnlock("candidate"))
if err != nil {
printAddLogEnt(fmt.Sprintf("NetConf exec(unlock) failed: %v", err), "Error", slackWebHook)
}
// sleep
return false
}
if nrApp != nil {
seg = nrgo.StartSegment(tx, "Commit router configuration")
}
_, err = ncSess.Exec(nc.RawMethod("<commit/>"))
if nrApp != nil {
seg.End()
}
if err != nil {
printAddLogEnt(fmt.Sprintf("NetConf exec(commit) failed: %v", err), "Error", slackWebHook)
_, err = ncSess.Exec(nc.MethodUnlock("candidate"))
if err != nil {
printAddLogEnt(fmt.Sprintf("NetConf exec(unlock) failed: %v", err), "Error", slackWebHook)
}
return false
}
if nrApp != nil {
seg = nrgo.StartSegment(tx, "Unlock router configuration")
}
_, err = ncSess.Exec(nc.MethodUnlock("candidate"))
if nrApp != nil {
seg.End()
}
if err != nil {
printAddLogEnt(fmt.Sprintf("NetConf exec(unlock) failed: %v", err), "Error", slackWebHook)
// sleep
return false
}
return true
}
func logSlack(webHookURL string) {
var (
tx *nrgo.Transaction
seg *nrgo.Segment
)
if nrApp != nil {
tx = nrApp.StartTransaction("logSlack")
defer tx.End()
}
slackPayload := `{"attachments":[`
slackPayloadFmt := `{"fallback":"New Changes/Errors","color":"%s","pretext":"New Changes/Errors","fields":[{"title":"%s","value":"%s","short":false}]},`
for _, logEnt := range logBuf {
slackPayload += fmt.Sprintf(slackPayloadFmt, LOGLEVEL[logEnt.Level], logEnt.Level, logEnt.Message)
}
slackPayload += "]}"
log.Debugf("%#v", slackPayload)
if nrApp != nil {
seg = nrgo.StartSegment(tx, "Slack HTTP POST")
}
// TODO: check the results of the POST
resp, _ := http.PostForm(webHookURL, url.Values{"payload": []string{slackPayload}})
if nrApp != nil {
seg.End()
}
defer resp.Body.Close()
logBuf = make([]LogEnt, 0)
}
func printAddLogEnt(msg, level, slackWebHook string) {
logBuf = append(logBuf, LogEnt{Message: msg, Level: level})
if level == "Fatal" {
// flush log messages to Slack if using
if len(slackWebHook) > 0 {
logSlack(slackWebHook)
}
log.Fatal(msg)
}
switch level {
case "Error":
log.Error(msg)
case "Warning":
log.Warn(msg)
case "Debug":
log.Debug(msg)
default:
log.Info(msg)
}
}
func running(path string) bool {
pidStr, err := ioutil.ReadFile(path)
if err == nil {
// pid file exists; read it
captureLeadingDigits, err := re.Compile(`^(\d+)[\n.]*`)
if err != nil {
log.Fatalf("%v", err)
}
pidStr = captureLeadingDigits.ReplaceAll(pidStr, []byte(`$1`))
psCmd := exec.Command("/bin/ps", "cp"+string(pidStr))
if err != nil {
log.Fatalf("exec /bin/ps: %v", err)
}
psData, err := psCmd.Output()
if err != nil && err.Error() != "exit status 1" {
log.Fatalf("read from /bin/ps: %v", err)
}
if s.IndexByte(string(psData), '\n') == len(psData)-1 {
// no process found
return false
} else {
// process found--don't care whether it's a previous instance
// of this or something completely unrelated
return true
}
} else {
// error reading pid file; if it doesn't exist, we're good; otherwise bail
errStr := fmt.Sprintf("%v", err)
if errStr[len(errStr)-25:] != "no such file or directory" {
log.Fatalf("%v (%s)", err)
}
return false
}
return true
}
func createPidFile(path string) {
err := ioutil.WriteFile(path, []byte(fmt.Sprintf("%d\n", os.Getpid())), 0666)
if err != nil {
log.Fatalf("can't create %s: %v", path, err)
}
}
func init() {
var err error
globalRegex = make(map[string]*re.Regexp)
globalRegex["rfc1918"], err = re.Compile(`^1(0|72\.(1[6-9]|2[0-9]|3[01])|92\.168)\.`)
if err != nil {
log.Fatalf("unable to compile 'rfc1918': %v", err)
}
globalRegex["tunnelSource"], err = re.Compile(`(<tunnel.*?>\s+<source>)\d+\.\d+\.\d+\.\d+`)
if err != nil {
log.Fatalf("unable to compile 'tunnelSource': %v", err)
}
globalRegex["loadConfigFragment"], err = re.Compile(`.*<configuration.*?>(.*)</configuration>.*`)
if err != nil {
log.Fatalf("unable to compile 'loadConfigFragment': %v", err)
}
globalRegex["reNewline"], err = re.Compile(`{NEWLINE}`)
if err != nil {
log.Fatalf("unable to compile 'reNewline': %v", err)
}
globalRegex["lessThan"], err = re.Compile(`<`)
if err != nil {
log.Fatalf("unable to compile 'reNewline': %v", err)
}
}