func (c *client) Expose() error {
output, err := exec.Command("weave", "--local", "ps", "weave:expose").Output()
if err != nil {
return err
}
ips := ipMatch.FindAllSubmatch(output, -1)
if ips != nil {
// Alread exposed!
return nil
}
if err := exec.Command("weave", "expose").Run(); err != nil {
return fmt.Errorf("Error running weave expose: %v", err)
}
return nil
}
func (c *client) PS() (map[string]PSEntry, error) {
cmd := exec.Command("weave", "--local", "ps")
out, err := cmd.StdoutPipe()
if err != nil {
return nil, err
}
if err := cmd.Start(); err != nil {
return nil, err
}
defer func() {
if err := cmd.Wait(); err != nil {
log.Errorf("'weave ps' cmd failed: %v", err)
}
}()
psEntriesByPrefix := map[string]PSEntry{}
scanner := bufio.NewScanner(out)
for scanner.Scan() {
line := scanner.Text()
groups := weavePsMatch.FindStringSubmatch(line)
if len(groups) == 0 {
continue
}
containerIDPrefix, macAddress, ips := groups[1], groups[2], []string{}
for _, ipGroup := range ipMatch.FindAllStringSubmatch(groups[3], -1) {
ips = append(ips, ipGroup[1])
}
psEntriesByPrefix[containerIDPrefix] = PSEntry{
ContainerIDPrefix: containerIDPrefix,
MACAddress: macAddress,
IPs: ips,
}
}
if err := scanner.Err(); err != nil {
return nil, err
}
return psEntriesByPrefix, nil
}
func (c *conntrackWalker) existingConnections() ([]flow, error) {
args := append([]string{"-L", "-o", "xml", "-p", "tcp"}, c.args...)
cmd := exec.Command("conntrack", args...)
stdout, err := cmd.StdoutPipe()
if err != nil {
return []flow{}, err
}
if err := cmd.Start(); err != nil {
return []flow{}, err
}
defer func() {
if err := cmd.Wait(); err != nil {
log.Errorf("conntrack existingConnections exit error: %v", err)
}
}()
var result conntrack
if err := xml.NewDecoder(stdout).Decode(&result); err == io.EOF {
return []flow{}, nil
} else if err != nil {
return []flow{}, err
}
return result.Flows, nil
}
func (c *conntrackWalker) run() {
// Fork another conntrack, just to capture existing connections
// for which we don't get events
existingFlows, err := c.existingConnections()
if err != nil {
log.Errorf("conntrack existingConnections error: %v", err)
return
}
for _, flow := range existingFlows {
c.handleFlow(flow, true)
}
args := append([]string{"-E", "-o", "xml", "-p", "tcp"}, c.args...)
cmd := exec.Command("conntrack", args...)
stdout, err := cmd.StdoutPipe()
if err != nil {
log.Errorf("conntrack error: %v", err)
return
}
stderr, err := cmd.StderrPipe()
if err != nil {
log.Errorf("conntrack error: %v", err)
return
}
go logPipe("conntrack stderr:", stderr)
if err := cmd.Start(); err != nil {
log.Errorf("conntrack error: %v", err)
return
}
defer func() {
if err := cmd.Wait(); err != nil {
log.Errorf("conntrack error: %v", err)
}
}()
c.Lock()
// We may have stopped in the mean time,
// so check to see if the channel is open
// under the lock.
select {
default:
case <-c.quit:
return
}
c.cmd = cmd
c.Unlock()
// Swallow the first two lines
reader := bufio.NewReader(stdout)
if line, err := reader.ReadString('\n'); err != nil {
log.Errorf("conntrack error: %v", err)
return
} else if line != xmlHeader {
log.Errorf("conntrack invalid output: '%s'", line)
return
}
if line, err := reader.ReadString('\n'); err != nil {
log.Errorf("conntrack error: %v", err)
return
} else if line != conntrackOpenTag {
log.Errorf("conntrack invalid output: '%s'", line)
return
}
defer log.Infof("contrack exiting")
// Now loop on the output stream
decoder := xml.NewDecoder(reader)
for {
var f flow
if err := decoder.Decode(&f); err != nil {
log.Errorf("conntrack error: %v", err)
return
}
c.handleFlow(f, false)
}
}