mirror of
https://github.com/ProtonMail/proton-bridge.git
synced 2025-12-10 04:36:43 +00:00
84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
// Copyright (c) 2025 Proton AG
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//
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// This file is part of Proton Mail Bridge.
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//
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// Proton Mail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Proton Mail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
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// port-blocker is a command-line that ensure a port or range of ports is occupied by creating listeners.
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package main
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import (
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"fmt"
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"net"
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"os"
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"strconv"
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)
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func main() {
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argCount := len(os.Args)
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if (len(os.Args) < 2) || (argCount > 3) {
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exitWithUsage("Invalid number of arguments.")
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}
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startPort := parsePort(os.Args[1])
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endPort := startPort
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if argCount == 3 {
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endPort = parsePort(os.Args[2])
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}
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runBlocker(startPort, endPort)
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}
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func parsePort(portString string) int {
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result, err := strconv.Atoi(portString)
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if err != nil {
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exitWithUsage(fmt.Sprintf("Invalid port '%v'.", portString))
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}
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if (result < 1024) || (result > 65535) { // ports below 1024 are reserved.
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exitWithUsage("Ports must be in the range [1024-65535].")
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}
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return result
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}
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func exitWithUsage(message string) {
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fmt.Printf("Usage: port-blocker <startPort> [<endPort>]\n")
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if len(message) > 0 {
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fmt.Println(message)
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}
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os.Exit(1)
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}
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func runBlocker(startPort, endPort int) {
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if endPort < startPort {
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exitWithUsage("startPort must be less than or equal to endPort.")
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}
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for port := startPort; port <= endPort; port++ {
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listener, err := net.Listen("tcp", "127.0.0.1:"+strconv.Itoa(port))
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if err != nil {
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fmt.Printf("Port %v is already blocked. Skipping.\n", port)
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} else {
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//goland:noinspection GoDeferInLoop
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defer func() {
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_ = listener.Close()
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}()
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}
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}
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fmt.Println("Blocking requested ports. Press enter to exit.")
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_, _ = fmt.Scanln()
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}
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