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sources_config.go
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/
sources_config.go
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//
// Copyright (c) 2016 Dean Jackson <[email protected]>
//
// MIT Licence. See http://opensource.org/licenses/MIT
//
// Created on 2016-12-11
//
package ssh
import (
"fmt"
"log"
"net/url"
"os"
"strconv"
"strings"
"github.com/havoc-io/ssh_config"
)
// ConfigHost is Host parsed from SSH config-format files.
type ConfigHost struct {
BaseHost
forcePort bool
forceUsername bool
}
// UID implements Host.
func (h *ConfigHost) UID() string { return UIDForHost(h) }
// SetPort implements Host.
func (h *ConfigHost) SetPort(i int) {
h.port = i
h.forcePort = true
}
// SetUsername implemeents Host.
func (h *ConfigHost) SetUsername(n string) {
h.username = n
h.forceUsername = true
}
// SSHURL returns a URL based on the Host value from the config file,
// *not* the Hostname.
func (h *ConfigHost) SSHURL() *url.URL {
u := &url.URL{
Scheme: "ssh",
Host: h.Name(),
}
if h.forcePort {
u.Host = fmt.Sprintf("%s:%d", u.Host, h.Port())
}
if h.forceUsername {
u.User = url.User(h.Username())
}
return u
}
// MoshCmd implements Host.
func (h *ConfigHost) MoshCmd(path string) string {
if path == "" {
path = "mosh"
}
cmd := path + " "
if h.forcePort {
cmd += fmt.Sprintf("--ssh 'ssh -p %d' ", h.Port())
}
if h.forceUsername && h.Username() != "" {
cmd += h.Username() + "@"
}
cmd += h.Name()
return cmd
}
// ConfigSource implements Source for ssh config-formatted files.
type ConfigSource struct {
baseSource
}
// NewConfigSource creates a new ConfigSource from an ssh configuration file.
func NewConfigSource(path, name string, priority int) *ConfigSource {
s := &ConfigSource{}
s.Filepath = path
s.name = name
s.priority = priority
return s
}
// Hosts implements Source.
func (s *ConfigSource) Hosts() []Host {
if s.hosts == nil {
hosts := parseConfigFile(s.Filepath)
log.Printf("[source/load/config] %d host(s) in '%s'", len(hosts), s.Name())
s.hosts = make([]Host, len(hosts))
for i, h := range hosts {
h.source = s.Name()
s.hosts[i] = Host(h)
}
}
return s.hosts
}
// parseConfigFile parse an SSH config file.
func parseConfigFile(path string) []*ConfigHost {
var hosts []*ConfigHost
r, err := os.Open(path)
if err != nil {
log.Printf("[config/%s] Error opening file: %s", path, err)
return hosts
}
cfg, err := ssh_config.Parse(r)
if err != nil {
log.Printf("[config/%s] Parse error: %s", path, err)
return hosts
}
for _, e := range cfg.Hosts {
var (
p *ssh_config.Param
port = 22
hn string // hostname
user string
)
p = e.GetParam(ssh_config.HostKeyword)
if p != nil {
hn = p.Value()
}
// log.Println(e.String())
// log.Printf("hostnames=%v", e.Hostnames)
p = e.GetParam(ssh_config.HostNameKeyword)
if p != nil {
hn = p.Value()
}
p = e.GetParam(ssh_config.PortKeyword)
if p != nil {
port, err = strconv.Atoi(p.Value())
if err != nil {
log.Printf("Bad port: %s", err)
port = 22
}
}
// log.Printf("port=%v", port)
p = e.GetParam(ssh_config.UserKeyword)
if p != nil {
user = p.Value()
}
for _, n := range e.Hostnames {
if strings.Contains(n, "*") || strings.Contains(n, "!") || strings.Contains(n, "?") {
continue
}
h := &ConfigHost{}
h.name = n
h.hostname = n
h.port = port
h.username = user
if hn != "" {
h.hostname = hn
}
// log.Printf("%+v", host)
hosts = append(hosts, h)
}
}
return hosts
}