52 lines
1.0 KiB
Go
52 lines
1.0 KiB
Go
package protocol
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import (
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"bytes"
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)
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// The required prefix for the SSH protocol identification line.
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const (
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ssh199Prefix = "SSH-1.99-"
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ssh20Prefix = "SSH-2.0-"
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)
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func init() {
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Register(Both, "", detectSSH)
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}
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func detectSSH(dir Direction, data []byte) *Protocol {
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// The data must be at least as long as the prefix itself.
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if len(data) < len(ssh20Prefix) {
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return nil
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}
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// The protocol allows for pre-banner text, so we have to check all lines.
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for _, line := range bytes.Split(data, []byte{'\n'}) {
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line = bytes.TrimSuffix(line, []byte{'\r'})
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if bytes.HasPrefix(line, []byte(ssh20Prefix)) {
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return &Protocol{
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Name: ProtocolSSH,
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Version: Version{
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Major: 2,
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Minor: 0,
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Patch: -1,
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Extra: string(line[len(ssh20Prefix):]),
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},
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}
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}
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if bytes.HasPrefix(line, []byte(ssh199Prefix)) {
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return &Protocol{
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Name: ProtocolSSH,
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Version: Version{
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Major: 1,
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Minor: 99,
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Patch: -1,
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Extra: string(line[len(ssh20Prefix):]),
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},
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}
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}
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}
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return nil
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}
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