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Update punch_handler.rs

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This commit is contained in:
lbl8603
2023-02-08 11:51:24 +08:00
committed by GitHub
parent d16cbe4ac6
commit 8ca09d72bd
1 changed files with 3 additions and 3 deletions
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switch/src/handle/punch_handler.rs
+3 -3
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@@ -104,7 +104,9 @@ fn handle(
// println!("punch {:?}", punch); // println!("punch {:?}", punch);
match punch.nat_type.enum_value_or_default() { match punch.nat_type.enum_value_or_default() {
NatType::Symmetric => { NatType::Symmetric => {
// 碰撞概率 p = 1 - e^(-(k^2+k)/(2n)) n = max_port-min_port+1 关键词：生日攻击 // 假设绑定n个端口，通过NAT对外映射出n个 公网ip:公网端口，随机尝试k次的情况下
// 猜中的概率 p = 1-((65535-n)/65535)*((65535-n-1)/(65535-1))*...*((65535-n-k+1)/(65535-k+1))
// n取76，k取600，猜中的概率就超过50%了
let mut send_f = |min_port: u16, max_port: u16, k: usize| -> io::Result<()> { let mut send_f = |min_port: u16, max_port: u16, k: usize| -> io::Result<()> {
let mut nums: Vec<u16> = (min_port..max_port).collect(); let mut nums: Vec<u16> = (min_port..max_port).collect();
nums.push(max_port); nums.push(max_port);
@@ -121,7 +123,6 @@ fn handle(
}; };
if punch.public_port_range < 600 { if punch.public_port_range < 600 {
//端口变化不大时，在预测的范围内随机发送 //端口变化不大时，在预测的范围内随机发送
//如果公网端口在这个范围的话，碰撞的概率最低为70%;
let min_port = if punch.public_port > punch.public_port_range { let min_port = if punch.public_port > punch.public_port_range {
punch.public_port - punch.public_port_range punch.public_port - punch.public_port_range
} else { } else {
@@ -140,7 +141,6 @@ fn handle(
send_f(min_port as u16, max_port as u16, k as usize)?; send_f(min_port as u16, max_port as u16, k as usize)?;
} }
// 全端口范围，随机取600个端口发送 // 全端口范围，随机取600个端口发送
// 取600个端口碰撞的概率为 93.6%，理论上成功的概率还是很高的
send_f(1, 65535, 600)?; send_f(1, 65535, 600)?;
} }
NatType::Cone => { NatType::Cone => {