forked from xitongsys/pangolin
/
route.go
85 lines (71 loc) · 1.41 KB
/
route.go
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package netinfo
import (
"bufio"
"fmt"
"io"
"os"
"strings"
)
var ROUTEPATH = "/proc/net/route"
type RouteItem struct {
Dest uint32
Gateway uint32
Mask uint32
Device string
}
func (ri *RouteItem) String() string {
return fmt.Sprintf("{Dest:%v, GateWay:%v, Mask:%v, Device:%v}", ip2s(ri.Dest), ip2s(ri.Gateway), ip2s(ri.Mask), ri.Device)
}
type Route struct {
routes []*RouteItem
}
func NewRoute() (*Route, error) {
r := &Route{}
err := r.Load(ROUTEPATH)
return r, err
}
func (r *Route) String() string {
res := "["
for _, v := range r.routes {
res += v.String()
}
res += "]"
return res
}
func (r *Route) Load(fname string) error {
f, err := os.Open(fname)
if err != nil {
return err
}
defer f.Close()
reader := bufio.NewReader(f)
_, _, err = reader.ReadLine()
if err != nil {
return err
}
r.routes = []*RouteItem{}
for {
line, _, err := reader.ReadLine()
if err == io.EOF {
break
}
ss := strings.Fields(string(line))
dev, dst, gateway, mask := ss[0], iprs2ip(ss[1]), iprs2ip(ss[2]), iprs2ip(ss[7])
r.routes = append(r.routes, &RouteItem{
Dest: dst,
Gateway: gateway,
Mask: mask,
Device: dev,
})
}
return nil
}
func (r *Route) GetGateway(dst uint32) (uint32, error) {
ln := len(r.routes)
for i := ln - 1; i >= 0; i-- {
if dst&r.routes[i].Mask == r.routes[i].Dest {
return r.routes[i].Gateway, nil
}
}
return 0, fmt.Errorf("can't find route")
}