egutierrez
bd9383fd82
12 funciones puras con implementación real: HashSHA256, HashMD5, EntropyShannon, IsBase64, IsHex, ExtractURLs, ParseIPCIDR, IPInRange, NormalizeURL, DetectSQLInjection, LevenshteinDistance, JaccardSimilarity 4 funciones impuras con implementación real (stdlib): LookupWhois, ResolveDNS, FetchHTTPHeaders, ScanPortTCP Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
35 lines
939 B
Go
35 lines
939 B
Go
package cybersecurity
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import (
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"fmt"
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"net"
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"time"
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)
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// ScanPortTCP intenta conectarse a un puerto TCP y devuelve el estado ("open", "closed", "filtered"),
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// un banner si el puerto esta abierto, y un posible error.
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func ScanPortTCP(host string, port int, timeoutMs int) (status string, banner string, err error) {
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address := fmt.Sprintf("%s:%d", host, port)
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timeout := time.Duration(timeoutMs) * time.Millisecond
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conn, err := net.DialTimeout("tcp", address, timeout)
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if err != nil {
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// Distinguir entre conexion rechazada (closed) y timeout (filtered)
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if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
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return "filtered", "", nil
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}
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return "closed", "", nil
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}
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defer conn.Close()
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// Intentar leer un banner con timeout corto
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_ = conn.SetReadDeadline(time.Now().Add(2 * time.Second))
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buf := make([]byte, 1024)
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n, _ := conn.Read(buf)
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if n > 0 {
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banner = string(buf[:n])
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}
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return "open", banner, nil
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}
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