/
map.go
76 lines (66 loc) · 1.6 KB
/
map.go
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package routing
import (
"bufio"
"fmt"
"io"
"net"
"os"
"github.com/rus-cert/socks-router/log"
)
// first match wins
type Map struct {
Routes []Route
}
func (m Map) Match(network string, address AddressDetails) *Target {
for _, route := range m.Routes {
if target := route.Match(network, address); nil != target {
return target
}
}
return nil
}
func (m Map) Dial(network, address string) (c net.Conn, err error) {
if ad, err := ParseAddress(address); nil != err {
return nil, err
} else {
var dial func(network, address string) (c net.Conn, err error)
var desc string
if target := m.Match(network, *ad); nil != target {
desc = fmt.Sprintf("to %v over %v", address, target.Name)
dial = target.Dialer.Dial
} else {
desc = fmt.Sprintf("directly to %v", address)
dial = DirectTarget.Dialer.Dial
}
log.Access.Printf("connecting %v", desc)
if conn, err := dial(network, address); nil != err {
log.Error.Printf("Failed to connect %v: %v", desc, err)
return nil, err
} else {
return conn, nil
}
}
}
func ReadMap(r io.Reader) (*Map, error) {
var m Map
scanner := bufio.NewScanner(r)
linenum := 0
for scanner.Scan() {
line := scanner.Text()
linenum += 1
if r, err := ParseRoute(line); nil != err {
return nil, fmt.Errorf("Error in config line %v: %v", linenum, err)
} else if nil != r {
m.Routes = append(m.Routes, r)
}
}
return &m, nil
}
func ReadMapFile(filename string) (*Map, error) {
if f, err := os.Open(filename); nil != err {
return nil, fmt.Errorf("Couldn't open file %q: %v", filename, err)
} else {
defer f.Close()
return ReadMap(f)
}
}