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April 20, 2015 16:19
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// Copyright (c) 2014 John Graham-Cumming | |
// | |
// Takes a CSV containing rows in the form | |
// | |
// ip,name | |
// | |
// Connects to 'ip' on port 443 using TLS presenting the SNI name 'name' and | |
// verifies the result. | |
package main | |
import ( | |
"bufio" | |
"crypto/tls" | |
"flag" | |
"fmt" | |
"log" | |
"net" | |
"os" | |
"strings" | |
"sync" | |
) | |
type task interface { | |
process() | |
print() | |
} | |
type factory interface { | |
make(line string) task | |
} | |
type check struct { | |
ip string | |
name string | |
err error | |
success bool | |
} | |
var workers int | |
func (c *check) process() { | |
conf := &tls.Config{ServerName: c.name, | |
InsecureSkipVerify: false} | |
conn, err := tls.Dial("tcp", net.JoinHostPort(c.ip, "443"), conf) | |
c.err = err | |
c.success = c.err == nil | |
if conn != nil { | |
conn.Close() | |
} | |
} | |
func (c *check) print() { | |
if c.err == nil { | |
c.err = fmt.Errorf("OK") | |
} | |
fmt.Printf("%s,%s,%t,%s\n", c.ip, c.name, c.success, c.err) | |
} | |
type usine struct { | |
} | |
func (u *usine) make(line string) task { | |
parts := strings.Split(line, ",") | |
if len(parts) != 2 { | |
log.Fatalf("Don't understand line '%s'\n", line) | |
} | |
return &check{ip: parts[0], name: parts[1]} | |
} | |
func run(f factory) { | |
var wg sync.WaitGroup | |
in := make(chan task) | |
wg.Add(1) | |
go func() { | |
s := bufio.NewScanner(os.Stdin) | |
for s.Scan() { | |
in <- f.make(s.Text()) | |
} | |
if s.Err() != nil { | |
log.Fatalf("Error reading STDIN: %s", s.Err()) | |
} | |
close(in) | |
wg.Done() | |
}() | |
out := make(chan task) | |
for i := 0; i < workers; i++ { | |
wg.Add(1) | |
go func() { | |
for t := range in { | |
t.process() | |
out <- t | |
} | |
wg.Done() | |
}() | |
} | |
go func() { | |
wg.Wait() | |
close(out) | |
}() | |
for t := range out { | |
t.print() | |
} | |
} | |
func main() { | |
flag.IntVar(&workers, "workers", 100, "Number of workers") | |
flag.Parse() | |
run(&usine{}) | |
} |
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