PowerShellでM-SEARCHを実装する例（chat-gpt活用）
UPnP機器を探すためのM-SEARCHメッセージをマルチキャストアドレスに送信して、レスポンスを受信する。セキュリティ資格の勉強でどうしてもイメージをつかみたくて調べた結果
実際にこのコードで動かしてみると、自宅のUpNP対応機器からレスポンスが返ってきた。
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# Define the M-SEARCH message $searchMessage = "M-SEARCH * HTTP/1.1`r`n" + "Host: 239.255.255.250:1900`r`n" + "ST: upnp:rootdevice`r`n" + "Man: ssdp:discover`r`n" + "MX: 3`r`n" + "`r`n" # Create a UDP client $client = New-Object System.Net.Sockets.UdpClient # Bind the client to the local endpoint $localEP = New-Object System.Net.IPEndPoint([System.Net.IPAddress]::Any, 0) $client.Client.Bind($localEP) # Set the multicast TTL to 1 (for local network only) $client.Client.SetSocketOption([System.Net.Sockets.SocketOptionLevel]::IP, [System.Net.Sockets.SocketOptionName]::MulticastTimeToLive, 1) # Join the multicast group $multicastAddress = [System.Net.IPAddress]::Parse("239.255.255.250") $client.JoinMulticastGroup($multicastAddress) # Send the M-SEARCH message to the multicast address $remoteEP = New-Object System.Net.IPEndPoint($multicastAddress, 1900) $bytes = [System.Text.Encoding]::ASCII.GetBytes($searchMessage) $client.Send($bytes, $bytes.Length, $remoteEP) # Receive responses from the UPnP devices $timeout = 5000 # 5 seconds $startTime = [System.DateTime]::Now while (([System.DateTime]::Now - $startTime).TotalMilliseconds -lt $timeout) { if ($client.Available -gt 0) { $remoteEP = New-Object System.Net.IPEndPoint([System.Net.IPAddress]::Any, 0) $responseBytes = $client.Receive([ref]$remoteEP) $responseMessage = [System.Text.Encoding]::ASCII.GetString($responseBytes) # TODO: Process the response message Write-Host "Response received from $($remoteEP.Address):`n$responseMessage`n" } } # Close the UDP client $client.Close() |
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