45 lines
770 B
Go
45 lines
770 B
Go
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package main
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import (
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"bufio"
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"crypto/tls"
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"fmt"
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"log"
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"net"
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"os"
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)
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func main() {
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s := bufio.NewScanner(os.Stdin)
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for s.Scan() {
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line := s.Text()
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if line == "" {
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continue
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}
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host, port := line, "443"
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if h, p, err := net.SplitHostPort(line); err == nil {
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host, port = h, p
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}
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c, err := tls.Dial("tcp", fmt.Sprintf("%v:%v", host, port), nil)
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if err != nil {
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log.Fatalf("dial: %v", err)
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}
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if err := c.Handshake(); err != nil {
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log.Fatalf("handshake: %v", err)
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}
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if err := c.Close(); err != nil {
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log.Fatalf("close: %v", err)
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}
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for _, chain := range c.ConnectionState().VerifiedChains {
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for _, cert := range chain {
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if cert.DNSNames != nil {
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fmt.Printf("%-24v %v\n", host, cert.NotAfter)
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}
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}
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}
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}
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}
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