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package hostess
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import (
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"sort"
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"strings"
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)
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const default_osx = `
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##
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# Host Database
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#
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# localhost is used to configure the loopback interface
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# when the system is booting. Do not change this entry.
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##
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127.0.0.1 localhost
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255.255.255.255 broadcasthost
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::1 localhost
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fe80::1%lo0 localhost
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`
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const default_linux = `
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127.0.0.1 localhost
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127.0.1.1 HOSTNAME
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# The following lines are desirable for IPv6 capable hosts
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::1 localhost ip6-localhost ip6-loopback
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fe00::0 ip6-localnet
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ff00::0 ip6-mcastprefix
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ff02::1 ip6-allnodes
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ff02::2 ip6-allrouters
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ff02::3 ip6-allhosts
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`
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// Hostfile represents /etc/hosts (or a similar file, depending on OS), and
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// includes a list of Hostnames. Hostfile includes
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type Hostfile struct {
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Path string
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Hosts Hostlist
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data string
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}
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// NewHostFile creates a new Hostfile object from the specified file.
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func NewHostfile(path string) *Hostfile {
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return &Hostfile{path, Hostlist{}, ""}
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}
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func (h *Hostfile) Load() string {
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data, err := ioutil.ReadFile(h.Path)
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if err != nil {
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fmt.Println("Can't read ", h.Path)
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os.Exit(1)
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}
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h.data = string(data)
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return h.data
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}
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func (h *Hostfile) Parse() []error {
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var errs []error
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for _, v := range strings.Split(h.data, "\n") {
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for _, hostname := range ParseLine(v) {
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err := h.Add(hostname)
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if err != nil {
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errs = append(errs, err)
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}
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}
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}
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return errs
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}
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func LoadHostFile() (*Hostfile, []error) {
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hostfile := NewHostfile(GetHostsPath())
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hostfile.Load()
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errs := hostfile.Parse()
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return hostfile, errs
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}
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func TrimWS(s string) string {
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return strings.Trim(s, " \n\t")
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}
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func ParseLine(line string) Hostlist {
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var hostnames Hostlist
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if len(line) == 0 {
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return hostnames
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}
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// Parse leading # for disabled lines
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enabled := true
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if line[0:1] == "#" {
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enabled = false
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line = TrimWS(line[1:])
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}
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// Parse other #s for actual comments
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line = strings.Split(line, "#")[0]
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// Replace tabs and multispaces with single spaces throughout
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line = strings.Replace(line, "\t", " ", -1)
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for strings.Contains(line, " ") {
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line = strings.Replace(line, " ", " ", -1)
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}
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// Break line into words
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words := strings.Split(line, " ")
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// Separate the first bit (the ip) from the other bits (the domains)
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ip := words[0]
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domains := words[1:]
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if LooksLikeIPv4(ip) || LooksLikeIPv6(ip) {
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for _, v := range domains {
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hostname := NewHostname(v, ip, enabled)
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hostnames = append(hostnames, hostname)
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}
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}
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return hostnames
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}
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func getSortedMapKeys(m map[string][]string) []string {
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keys := make([]string, len(m))
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i := 0
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for k := range m {
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keys[i] = k
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i++
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}
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sort.Strings(keys)
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return keys
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}
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// MoveToFront looks for string in a slice of strings and if it finds it, moves
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// it to the front of the slice.
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// Note: this could probably be made faster using pointers to switch the values
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// instead of copying a bunch of crap, but it works and speed is not a problem.
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func MoveToFront(list []string, search string) []string {
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for k, v := range list {
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if v == search {
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list = append(list[:k], list[k+1:]...)
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}
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}
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return append([]string{search}, list...)
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}
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// ListDomainsByIP will look through Hostfile to find domains that match the
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// specified IP and return them in a sorted slice.
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func (h *Hostfile) ListDomainsByIP(ip net.IP) []string {
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var names []string
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for _, v := range h.Hosts {
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if v.IP.Equal(ip) {
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names = append(names, v.Domain)
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}
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}
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sort.Strings(names)
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// Magic for localhost only, to make sure it's the first domain on its line
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if ip.Equal(net.ParseIP("127.0.0.1")) {
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names = MoveToFront(names, "localhost")
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}
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return names
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}
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// ListDomains will return a list of domains in alphabetical order.
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func (h *Hostfile) ListDomains() []string {
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var names []string
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for _, v := range h.Hosts {
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names = append(names, v.Domain)
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}
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sort.Strings(names)
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return names
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}
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// Format takes the current list of Hostnames in this Hostfile and turns it
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// into a string suitable for use as an /etc/hosts file.
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// Sorting uses the following logic:
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// 1. List is sorted by IP address
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// 2. Commented items are left in place
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// 3. 127.* appears at the top of the list (so boot resolvers don't break)
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// 4. When present, localhost will always appear first in the domain list
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func (h *Hostfile) Format() string {
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// localhost := "127.0.0.1 localhost"
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localhosts := make(map[string][]string)
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ips := make(map[string][]string)
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// Map domains and IPs into slices of domains keyd by IP
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// 127.0.0.1 = [localhost, blah, blah2]
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// 2.2.2.3 = [domain1, domain2]
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for _, hostname := range h.Hosts {
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if hostname.IP.String()[0:4] == "127." {
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localhosts[hostname.IP.String()] = append(localhosts[hostname.IP.String()], hostname.Domain)
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} else {
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ips[hostname.IP.String()] = append(ips[hostname.IP.String()], hostname.Domain)
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}
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}
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// localhosts_keys := getSortedMapKeys(localhosts)
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// ips_keys := getSortedMapKeys(ips)
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var out []string
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// for _, ip := range localhosts_keys {
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// enabled := ip
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// enabled_b := false
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// disabled := "# " + ip
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// disabled_b := false
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// IP := net.ParseIP(ip)
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// for _, domain := range h.ListDomainsByIP(IP) {
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// hostname := *h.Hosts[domain]
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// if hostname.IP.Equal(IP) {
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// if hostname.Enabled {
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// enabled += " " + hostname.Domain
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// enabled_b = true
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// } else {
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// disabled += " " + hostname.Domain
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// disabled_b = true
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// }
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// }
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// }
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// if enabled_b {
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// out = append(out, enabled)
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// }
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// if disabled_b {
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// out = append(out, disabled)
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// }
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// }
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// for _, ip := range ips_keys {
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// enabled := ip
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// enabled_b := false
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// disabled := "# " + ip
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// disabled_b := false
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// IP := net.ParseIP(ip)
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// for _, domain := range h.ListDomainsByIP(IP) {
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// hostname := *h.Hosts[domain]
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// if hostname.IP.Equal(IP) {
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// if hostname.Enabled {
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// enabled += " " + hostname.Domain
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// enabled_b = true
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// } else {
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// disabled += " " + hostname.Domain
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// disabled_b = true
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// }
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// }
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// }
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// if enabled_b {
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// out = append(out, enabled)
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// }
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// if disabled_b {
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// out = append(out, disabled)
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// }
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// }
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return strings.Join(out, "\n")
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}
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func (h *Hostfile) Save() error {
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// h.Format(h.Path)
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return nil
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}
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func (h *Hostfile) Contains(b *Hostname) bool {
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for _, a := range h.Hosts {
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if a.Equal(b) {
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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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func (h *Hostfile) ContainsDomain(search string) bool {
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for _, hostname := range h.Hosts {
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if hostname.Domain == search {
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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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func (h *Hostfile) Add(host *Hostname) error {
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// host_f, found := h.Hosts[host.Domain]
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// if found {
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// if host_f.IP.Equal(host.IP) {
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// return errors.New(fmt.Sprintf("Duplicate hostname entry for %s -> %s",
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// host.Domain, host.IP))
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// } else {
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// return errors.New(fmt.Sprintf("Conflicting hostname entries for %s -> %s and -> %s",
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// host.Domain, host.IP, host_f.IP))
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// }
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// } else {
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// h.Hosts[host.Domain] = host
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// }
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return nil
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}
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func (h *Hostfile) Delete(domain string) {
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// delete(h.Hosts, domain)
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}
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func (h *Hostfile) Enable(domain string) {
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// _, ok := h.Hosts[domain]
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// if ok {
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// h.Hosts[domain].Enabled = true
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// }
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}
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func (h *Hostfile) Disable(domain string) {
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// _, ok := h.Hosts[domain]
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// if ok {
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// h.Hosts[domain].Enabled = false
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// }
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}
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func GetHostsPath() string {
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path := os.Getenv("HOSTESS_FILE")
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if path == "" {
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path = "/etc/hosts"
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}
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return path
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}
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