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|
package hackers_git
import (
"inotify"
"os"
"path/filepath"
"sd_daemon/logger"
"sd_daemon/lsb"
)
const (
in_CHILD_ADD = inotify.IN_CREATE | inotify.IN_MOVED_TO
in_CHILD_DEL = inotify.IN_DELETE | inotify.IN_MOVED_FROM
in_CHILD_MOD = inotify.IN_CLOSE_WRITE | inotify.IN_MOVED_TO
in_CHILD_ANY = in_CHILD_ADD | in_CHILD_DEL | in_CHILD_MOD
in_DIR_INVALID = inotify.IN_MOVE_SELF | inotify.IN_DELETE_SELF
in_DIR = inotify.IN_ONLYDIR | in_DIR_INVALID
)
func (o *Hackers) watchHomedir(uid int32) {
wd, err := o.in_fd.AddWatch(o.users[uid].passwd.HomeDir, in_DIR|in_CHILD_ANY)
if err == nil {
oldwd, found := o.in_uid2wd[uid]
if found && oldwd != wd {
o.unwatchHomedir(oldwd)
}
o.in_uid2wd[uid] = wd
o.in_wd2uid[wd] = uid
} else {
delete(o.in_uid2wd, uid)
logger.Info("could not watch: %s", o.users[uid].passwd.HomeDir)
}
}
func (o *Hackers) unwatchHomedir(wd inotify.Cint) {
err := o.in_fd.RmWatch(wd)
if err != nil {
logger.Warning("could not remove watch: %v", wd)
return
}
uid := o.in_wd2uid[wd]
delete(o.in_wd2uid, wd)
delete(o.in_uid2wd, uid)
}
func (o *Hackers) close() {
if o.in_fd != nil {
o.in_fd.Close()
}
o.in_wd_home = -1
o.in_wd_yaml = -1
o.users = make(map[int32]user, 0)
o.in_uid2wd = make(map[int32]inotify.Cint, 0)
o.in_wd2uid = make(map[inotify.Cint]int32, 0)
}
func (o *Hackers) reload() (err error) {
o.close()
o.in_fd, err = inotify.InotifyInit() ; if err != nil { return }
o.in_wd_home, err = o.in_fd.AddWatch("/home" , in_DIR|in_CHILD_ADD); if err != nil { return }
o.in_wd_yaml, err = o.in_fd.AddWatch(o.cfg.Yamldir, in_DIR|in_CHILD_ANY); if err != nil { return }
filenames, err := filepath.Glob(o.cfg.Yamldir + "/*.yml")
o.users = make(map[int32]user, len(filenames))
o.in_uid2wd = make(map[int32]inotify.Cint, len(filenames))
o.in_wd2uid = make(map[inotify.Cint]int32, len(filenames))
for _, filename := range filenames {
logger.Info("Loading yaml file: %s", filename)
user, err := load_user_yaml(filename)
if err == nil {
o.users[user.passwd.UID] = user
logger.Info("... success")
o.watchHomedir(user.passwd.UID)
o.passwords[user.passwd.UID] = load_user_password(user.passwd.HomeDir + "/.password")
} else {
logger.Info("... error: %v", err)
}
}
err = nil
return
}
func (o *Hackers) worker_handle_user_add(user user) {
o.lock.Lock()
defer o.lock.Unlock()
o.users[user.passwd.UID] = user
o.watchHomedir(user.passwd.UID)
o.passwords[user.passwd.UID] = load_user_password(user.passwd.HomeDir + "/.password")
}
func (o *Hackers) worker_handle_user_del(uid int32) {
o.lock.Lock()
defer o.lock.Unlock()
wd, found := o.in_uid2wd[uid]
if found {
o.unwatchHomedir(wd)
}
delete(o.users, uid)
}
func (o *Hackers) worker_watch_homedirs() {
for uid, _ := range o.users {
o.watchHomedir(uid)
}
}
func (o *Hackers) worker_handle_passwd(uid int32) {
o.lock.Lock()
defer o.lock.Unlock()
o.passwords[uid] = load_user_password(o.users[uid].passwd.HomeDir + "/.password")
}
func worker_error(format string, a ...interface{}) {
logger.Err(format, a)
os.Exit(int(lsb.EXIT_FAILURE))
}
func (o *Hackers) worker() {
err := os.Chdir(o.cfg.Yamldir)
if err != nil {
worker_error("failed to load %q: %v", o.cfg.Yamldir, err)
}
for event, err := o.in_fd.Read(); err == nil; event, err = o.in_fd.Read() {
switch event.Wd {
case o.in_wd_yaml:
// handle updates to yaml files
if event.Mask&in_DIR_INVALID != 0 {
err := o.Reload()
if err != nil {
worker_error("failed to reload hackers.git yaml directory: %v", err)
}
err = os.Chdir(o.cfg.Yamldir)
if err != nil {
worker_error("failed to load %q: %v", o.cfg.Yamldir, err)
}
} else if event.Mask&in_CHILD_ANY != 0 {
if (event.Name == nil) {
panic("recieved child event from inotify, but no child name")
}
filename := o.cfg.Yamldir + "/" + *event.Name
logger.Info("Loading yaml file: %s", filename)
user, err := load_user_yaml(filename)
if err == nil {
// User added/updated
logger.Info("... success")
o.worker_handle_user_add(user)
} else if user.passwd.UID >= 0 {
// User became invalid
logger.Info("... error: %v", err)
o.worker_handle_user_del(user.passwd.UID)
}
} else {
panic("recieved non-subscribed inotify event from kernel")
}
case o.in_wd_home:
if event.Mask&in_DIR_INVALID != 0 {
err := o.Reload()
if err != nil {
panic(err)
}
} else if event.Mask&inotify.IN_ISDIR != 0 {
// handle added home directory
o.worker_watch_homedirs()
}
default:
// handle a change to someone's password
if event.Mask&in_DIR_INVALID != 0 {
o.unwatchHomedir(event.Wd)
o.worker_watch_homedirs()
} else if event.Name != nil {
if *event.Name == ".password" {
o.worker_handle_passwd(o.in_wd2uid[event.Wd])
}
} else {
logger.Debug("event didn't match: %#v", event)
}
}
}
// This happens only sometimes--depending on if the main
// goroutine or this goroutine is killed by os.Exit first;
// this happens if the main goroutine calls inotify.Close()
// before this groutine is killed.
logger.Info("Stopping hackers.git inotify watcher")
}
|
