mirror of
https://github.com/TwiN/gatus.git
synced 2024-10-05 17:51:57 +02:00
118 lines
3.4 KiB
Go
118 lines
3.4 KiB
Go
package client
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import (
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"crypto/tls"
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"crypto/x509"
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"errors"
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"net"
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"net/http"
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"net/smtp"
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"runtime"
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"strings"
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"time"
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"github.com/go-ping/ping"
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)
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// injectedHTTPClient is used for testing purposes
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var injectedHTTPClient *http.Client
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// GetHTTPClient returns the shared HTTP client
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func GetHTTPClient(config *Config) *http.Client {
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if injectedHTTPClient != nil {
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return injectedHTTPClient
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}
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if config == nil {
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return defaultConfig.getHTTPClient()
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}
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return config.getHTTPClient()
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}
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// CanCreateTCPConnection checks whether a connection can be established with a TCP endpoint
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func CanCreateTCPConnection(address string, config *Config) bool {
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conn, err := net.DialTimeout("tcp", address, config.Timeout)
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if err != nil {
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return false
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}
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_ = conn.Close()
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return true
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}
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// CanPerformStartTLS checks whether a connection can be established to an address using the STARTTLS protocol
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func CanPerformStartTLS(address string, config *Config) (connected bool, certificate *x509.Certificate, err error) {
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hostAndPort := strings.Split(address, ":")
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if len(hostAndPort) != 2 {
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return false, nil, errors.New("invalid address for starttls, format must be host:port")
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}
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connection, err := net.DialTimeout("tcp", address, config.Timeout)
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if err != nil {
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return
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}
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smtpClient, err := smtp.NewClient(connection, hostAndPort[0])
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if err != nil {
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return
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}
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err = smtpClient.StartTLS(&tls.Config{
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InsecureSkipVerify: config.Insecure,
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ServerName: hostAndPort[0],
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})
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if err != nil {
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return
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}
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if state, ok := smtpClient.TLSConnectionState(); ok {
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certificate = state.PeerCertificates[0]
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} else {
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return false, nil, errors.New("could not get TLS connection state")
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}
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return true, certificate, nil
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}
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// CanPerformTLS checks whether a connection can be established to an address using the TLS protocol
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func CanPerformTLS(address string, config *Config) (connected bool, certificate *x509.Certificate, err error) {
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connection, err := tls.DialWithDialer(&net.Dialer{Timeout: config.Timeout}, "tcp", address, nil)
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if err != nil {
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return
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}
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defer connection.Close()
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verifiedChains := connection.ConnectionState().VerifiedChains
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if len(verifiedChains) == 0 || len(verifiedChains[0]) == 0 {
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return
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}
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return true, verifiedChains[0][0], nil
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}
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// Ping checks if an address can be pinged and returns the round-trip time if the address can be pinged
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//
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// Note that this function takes at least 100ms, even if the address is 127.0.0.1
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func Ping(address string, config *Config) (bool, time.Duration) {
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pinger, err := ping.NewPinger(address)
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if err != nil {
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return false, 0
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}
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pinger.Count = 1
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pinger.Timeout = config.Timeout
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// Set the pinger's privileged mode to true for every GOOS except darwin
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// See https://github.com/TwiN/gatus/issues/132
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//
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// Note that for this to work on Linux, Gatus must run with sudo privileges.
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// See https://github.com/go-ping/ping#linux
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pinger.SetPrivileged(runtime.GOOS != "darwin")
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err = pinger.Run()
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if err != nil {
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return false, 0
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}
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if pinger.Statistics() != nil {
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// If the packet loss is 100, it means that the packet didn't reach the host
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if pinger.Statistics().PacketLoss == 100 {
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return false, pinger.Timeout
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}
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return true, pinger.Statistics().MaxRtt
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}
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return true, 0
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}
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// InjectHTTPClient is used to inject a custom HTTP client for testing purposes
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func InjectHTTPClient(httpClient *http.Client) {
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injectedHTTPClient = httpClient
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}
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