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Owen
2025-02-22 12:53:46 -05:00
parent 43a43b429d
commit b2830e8473
3 changed files with 19 additions and 7 deletions
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1
go.mod
View File

@@ -17,5 +17,6 @@ require (
github.com/vishvananda/netlink v1.3.0 // indirect
github.com/vishvananda/netns v0.0.4 // indirect
golang.org/x/crypto v0.31.0 // indirect
golang.org/x/exp v0.0.0-20250218142911-aa4b98e5adaa // indirect
golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect
)

2
go.sum
View File

@@ -12,6 +12,8 @@ github.com/vishvananda/netns v0.0.4 h1:Oeaw1EM2JMxD51g9uhtC0D7erkIjgmj8+JZc26m1Y
github.com/vishvananda/netns v0.0.4/go.mod h1:SpkAiCQRtJ6TvvxPnOSyH3BMl6unz3xZlaprSwhNNJM=
golang.org/x/crypto v0.31.0 h1:ihbySMvVjLAeSH1IbfcRTkD/iNscyz8rGzjF/E5hV6U=
golang.org/x/crypto v0.31.0/go.mod h1:kDsLvtWBEx7MV9tJOj9bnXsPbxwJQ6csT/x4KIN4Ssk=
golang.org/x/exp v0.0.0-20250218142911-aa4b98e5adaa h1:t2QcU6V556bFjYgu4L6C+6VrCPyJZ+eyRsABUPs1mz4=
golang.org/x/exp v0.0.0-20250218142911-aa4b98e5adaa/go.mod h1:BHOTPb3L19zxehTsLoJXVaTktb06DFgmdW6Wb9s8jqk=
golang.org/x/net v0.33.0 h1:74SYHlV8BIgHIFC/LrYkOGIwL19eTYXQ5wc6TBuO36I=
golang.org/x/net v0.33.0/go.mod h1:HXLR5J+9DxmrqMwG9qjGCxZ+zKXxBru04zlTvWlWuN4=
golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

23
main.go
View File

@@ -21,6 +21,7 @@ import (
"github.com/fosrl/olm/websocket"
"github.com/vishvananda/netlink"
"golang.org/x/exp/rand"
"golang.org/x/sys/unix"
"golang.zx2c4.com/wireguard/conn"
"golang.zx2c4.com/wireguard/device"
@@ -360,23 +361,31 @@ func FindAvailableUDPPort(minPort, maxPort uint16) (uint16, error) {
return 0, fmt.Errorf("invalid port range: min=%d, max=%d", minPort, maxPort)
}
for port := minPort; port <= maxPort; port++ {
// Create the UDP address to test
// Create a slice of all ports in the range
portRange := make([]uint16, maxPort-minPort+1)
for i := range portRange {
portRange[i] = minPort + uint16(i)
}
// Fisher-Yates shuffle to randomize the port order
rand.Seed(uint64(time.Now().UnixNano()))
for i := len(portRange) - 1; i > 0; i-- {
j := rand.Intn(i + 1)
portRange[i], portRange[j] = portRange[j], portRange[i]
}
// Try each port in the randomized order
for _, port := range portRange {
addr := &net.UDPAddr{
IP: net.ParseIP("127.0.0.1"),
Port: int(port),
}
// Attempt to create a UDP listener
conn, err := net.ListenUDP("udp", addr)
if err != nil {
continue // Port is in use or there was an error, try next port
}
// Close the connection immediately
_ = conn.SetDeadline(time.Now())
conn.Close()
return port, nil
}