106 lines
3.1 KiB
Go
106 lines
3.1 KiB
Go
// Copyright (C) 2021 Shizun Ge
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
//
|
|
|
|
package main
|
|
|
|
import (
|
|
"math/rand"
|
|
"net"
|
|
"sync/atomic"
|
|
"time"
|
|
|
|
"github.com/golang/glog"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
var letterBytes = []byte(" abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890!@#$%^&*()-=_+[]{}|;:',./<>?")
|
|
|
|
func randStringBytes(n int64) []byte {
|
|
b := make([]byte, n+1)
|
|
for i := range b {
|
|
b[i] = letterBytes[rand.Intn(len(letterBytes))]
|
|
}
|
|
b[n] = '\n'
|
|
return b
|
|
}
|
|
|
|
type client struct {
|
|
conn net.Conn
|
|
last time.Time
|
|
next time.Time
|
|
start time.Time
|
|
interval time.Duration
|
|
geoipSupplier string
|
|
geohash string
|
|
country string
|
|
location string
|
|
bytes_sent int
|
|
}
|
|
|
|
func NewClient(conn net.Conn, interval time.Duration, maxClient int64, geoipSupplier string) *client {
|
|
addr := conn.RemoteAddr().(*net.TCPAddr)
|
|
atomic.AddInt64(&numCurrentClients, 1)
|
|
atomic.AddInt64(&numTotalClients, 1)
|
|
geohash, country, location, err := geohashAndLocation(addr.IP.String(), geoipSupplier)
|
|
if err != nil {
|
|
glog.Warningf("Failed to obatin the geohash of %v: %v.", addr.IP, err)
|
|
}
|
|
clientIP.With(prometheus.Labels{
|
|
"ip": addr.IP.String(),
|
|
"geohash": geohash,
|
|
"country": country,
|
|
"location": location}).Inc()
|
|
glog.V(1).Infof("ACCEPT host=%v port=%v n=%v/%v\n", addr.IP, addr.Port, numCurrentClients, maxClient)
|
|
return &client{
|
|
conn: conn,
|
|
last: time.Now(),
|
|
next: time.Now().Add(interval),
|
|
start: time.Now(),
|
|
interval: interval,
|
|
geohash: geohash,
|
|
country: country,
|
|
location: location,
|
|
bytes_sent: 0,
|
|
}
|
|
}
|
|
|
|
func (c *client) Send(bannerMaxLength int64) error {
|
|
defer func(c *client) {
|
|
addr := c.conn.RemoteAddr().(*net.TCPAddr)
|
|
millisecondsSpent := time.Now().Sub(c.last).Milliseconds()
|
|
c.last = time.Now()
|
|
c.next = time.Now().Add(c.interval)
|
|
atomic.AddInt64(&numTotalMilliseconds, millisecondsSpent)
|
|
clientSeconds.With(prometheus.Labels{"ip": addr.IP.String()}).Add(float64(millisecondsSpent) / 1000)
|
|
}(c)
|
|
length := rand.Int63n(bannerMaxLength)
|
|
bytes_sent, err := c.conn.Write(randStringBytes(length))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
c.bytes_sent += bytes_sent
|
|
atomic.AddInt64(&numTotalBytes, int64(bytes_sent))
|
|
return nil
|
|
}
|
|
|
|
func (c *client) Close() {
|
|
addr := c.conn.RemoteAddr().(*net.TCPAddr)
|
|
atomic.AddInt64(&numCurrentClients, -1)
|
|
atomic.AddInt64(&numTotalClientsClosed, 1)
|
|
glog.V(1).Infof("CLOSE host=%v port=%v time=%v bytes=%v\n", addr.IP, addr.Port, time.Now().Sub(c.start).Seconds(), c.bytes_sent)
|
|
c.conn.Close()
|
|
}
|