99 lines
1.7 KiB
Go
99 lines
1.7 KiB
Go
package main
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import (
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"net"
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"regexp"
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"time"
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"github.com/czerwonk/bird_exporter/protocol"
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"github.com/prometheus/common/log"
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)
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const bufferSize = 4096
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const timeout = 30
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var birdReturnCodeRegex *regexp.Regexp
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func init() {
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birdReturnCodeRegex = regexp.MustCompile("\\d{4} \n$")
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}
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func getProtocols() ([]*protocol.Protocol, error) {
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protocols := make([]*protocol.Protocol, 0)
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if *birdEnabled {
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s, err := getProtocolsFromBird(*birdSocket, 4)
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if err != nil {
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return nil, err
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}
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protocols = append(protocols, s...)
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}
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if *bird6Enabled {
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s, err := getProtocolsFromBird(*bird6Socket, 6)
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if err != nil {
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return nil, err
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}
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protocols = append(protocols, s...)
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}
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return protocols, nil
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}
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func getProtocolsFromBird(socketPath string, ipVersion int) ([]*protocol.Protocol, error) {
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conn, err := net.Dial("unix", socketPath)
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if err != nil {
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return nil, err
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}
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defer conn.Close()
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conn.SetReadDeadline(time.Now().Add(timeout * time.Second))
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buf := make([]byte, bufferSize)
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n, err := conn.Read(buf[:])
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if err != nil {
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return nil, err
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}
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log.Debug(string(buf[:n]))
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_, err = conn.Write([]byte("show protocols all\n"))
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if err != nil {
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return nil, err
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}
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output, err := readFromSocket(conn)
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if err != nil {
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return nil, err
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}
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return parseOutput(output, ipVersion), nil
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}
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func readFromSocket(conn net.Conn) ([]byte, error) {
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b := make([]byte, 0)
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buf := make([]byte, bufferSize)
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done := false
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for !done {
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n, err := conn.Read(buf[:])
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if err != nil {
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return nil, err
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}
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b = append(b, buf[:n]...)
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done = endsWithBirdReturnCode(b)
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}
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return b, nil
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}
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func endsWithBirdReturnCode(b []byte) bool {
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if len(b) < 6 {
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return false
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}
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return birdReturnCodeRegex.Match(b[len(b)-6:])
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}
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