115 lines
2.3 KiB
Go
115 lines
2.3 KiB
Go
package consul
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import (
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"fmt"
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"github.com/hashicorp/serf/serf"
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"net"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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)
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/*
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* Contains an entry for each private block:
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* 10.0.0.0/8
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* 172.16.0.0/12
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* 192.168/16
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*/
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var privateBlocks []*net.IPNet
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func init() {
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// Add each private block
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privateBlocks = make([]*net.IPNet, 3)
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_, block, err := net.ParseCIDR("10.0.0.0/8")
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if err != nil {
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panic(fmt.Sprintf("Bad cidr. Got %v", err))
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}
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privateBlocks[0] = block
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_, block, err = net.ParseCIDR("172.16.0.0/12")
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if err != nil {
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panic(fmt.Sprintf("Bad cidr. Got %v", err))
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}
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privateBlocks[1] = block
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_, block, err = net.ParseCIDR("192.168.0.0/16")
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if err != nil {
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panic(fmt.Sprintf("Bad cidr. Got %v", err))
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}
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privateBlocks[2] = block
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}
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// strContains checks if a list contains a string
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func strContains(l []string, s string) bool {
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for _, v := range l {
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if v == s {
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return true
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}
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}
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return false
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}
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// ensurePath is used to make sure a path exists
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func ensurePath(path string, dir bool) error {
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if !dir {
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path = filepath.Dir(path)
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}
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return os.MkdirAll(path, 0755)
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}
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// Returns if a member is a consul server. Returns a bool,
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// the data center, and the rpc port
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func isConsulServer(m serf.Member) (bool, string, int) {
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role := m.Role
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if !strings.HasPrefix(role, "consul:") {
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return false, "", 0
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}
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parts := strings.SplitN(role, ":", 3)
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datacenter := parts[1]
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port_str := parts[2]
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port, err := strconv.Atoi(port_str)
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if err != nil {
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return false, "", 0
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}
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return true, datacenter, port
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}
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// Returns if the given IP is in a private block
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func isPrivateIP(ip_str string) bool {
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ip := net.ParseIP(ip_str)
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for _, priv := range privateBlocks {
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if priv.Contains(ip) {
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return true
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}
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}
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return false
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}
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// GetPrivateIP is used to return the first private IP address
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// associated with an interface on the machine
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func GetPrivateIP() (*net.IPNet, error) {
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addresses, err := net.InterfaceAddrs()
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if err != nil {
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return nil, fmt.Errorf("Failed to get interface addresses: %v", err)
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}
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// Find private IPv4 address
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for _, addr := range addresses {
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ip, ok := addr.(*net.IPNet)
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if !ok {
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continue
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}
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if ip.IP.To4() == nil {
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continue
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}
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if !isPrivateIP(ip.IP.String()) {
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continue
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}
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return ip, nil
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}
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return nil, fmt.Errorf("No private IP address found")
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}
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