// UnitFileStatuses returns a list of all unit files with their current status,
// as shown by `systemctl list-unit-files`.
func UnitFileStatuses() (units, statuses []string, err error) {
cmd := exec.Command("systemctl", "--no-pager", "list-unit-files")
out, err := cmd.CombinedOutput()
if err != nil {
err2 := errors.New(err.Error() + ": output: " + string(out))
return units, statuses, err2
}
table := tabular.ProbabalisticSplit(string(out))
units = tabular.GetColumnNoHeader(0, table)
// last two are empty line and junk statistics we don't care about
if len(units) <= 3 {
msg := fmt.Sprint(cmd.Args) + " didn't output enough lines"
return units, statuses, errors.New(msg)
}
cmd = exec.Command("systemctl", "--no-pager", "list-unit-files")
table = tabular.ProbabalisticSplit(string(out))
statuses = tabular.GetColumnNoHeader(1, table)
// last two are empty line and junk statistics we don't care about
if len(statuses) <= 3 {
msg := fmt.Sprint(cmd.Args) + " didn't output enough lines"
return units, statuses, errors.New(msg)
}
return units[:len(units)-2], statuses[:len(statuses)-2], nil
}
// getYumRepos constructs Repos from the yum.conf file at path. Gives non-zero
// Names, Fullnames, and URLs.
func getYumRepos() (repos []repo) {
// safeAccess allows access w/o fear of a panic into a slice of strings
safeAccess := func(slc []string, index int) string {
// catch runtime panic
defer func() {
if err := recover(); err != nil {
msg := "safeAccess: Please report this error"
errutil.IndexError(msg, index, slc)
}
}() // invoke inside defer
if len(slc) > index {
return slc[index]
}
return ""
}
// get and parse output of `yum repolist`
cmd := exec.Command("yum", "repolist")
outstr := chkutil.CommandOutput(cmd)
// handle empty case
if strings.Contains(outstr, "repolist: 0") {
return repos
}
slc := tabular.ProbabalisticSplit(outstr)
ids := tabular.GetColumnNoHeader(0, slc) // TODO use columnbyheader here
errutil.IndexError("getYumRepos", 2, ids)
ids = ids[:len(ids)-2]
names := tabular.GetColumnNoHeader(1, slc) // TODO and here
statuses := tabular.GetColumnNoHeader(2, slc) // TODO and here
if len(ids) != len(names) || len(names) != len(statuses) {
log.WithFields(log.Fields{
"names": len(names),
"ids": len(ids),
"statuses": len(statuses),
}).Warn("Could not fetch complete metadata for every repo.")
}
// Construct repos
for i := range ids {
name := safeAccess(names, i)
id := safeAccess(ids, i)
status := safeAccess(statuses, i)
repo := repo{Name: name, ID: id, Status: status}
repos = append(repos, repo)
}
return repos
}
// CommandColumnNoHeader returns a specified column of the output of a command,
// without that column's header. Useful for parsing the output of shell commands,
// which many of the Checks require.
func CommandColumnNoHeader(col int, cmd *exec.Cmd) []string {
out := CommandOutput(cmd)
return tabular.GetColumnNoHeader(col, tabular.StringToSlice(out))
}
// port parses /proc/net/tcp to determine if a given port is in an open state
// and returns an error if it is not.
func port(parameters []string) (exitCode int, exitMessage string) {
// getHexPorts gets all open ports as hex strings from /proc/net/tcp
getHexPorts := func() (ports []string) {
path := "/proc/net/tcp"
data := wrkutils.FileToString(path)
table := tabular.ProbabalisticSplit(data)
// TODO by header isn't working
//localAddresses := tabular.GetColumnByHeader("local_address", table)
localAddresses := tabular.GetColumnNoHeader(1, table)
portRe := regexp.MustCompile(`([0-9A-F]{8}):([0-9A-F]{4})`)
for _, address := range localAddresses {
port := portRe.FindString(address)
if port != "" {
if len(port) < 10 {
log.WithFields(log.Fields{
"port": port,
"length": len(port),
}).Fatal("Couldn't parse port number in " + path)
}
portString := string(port[9:])
ports = append(ports, portString)
}
}
return ports
}
// strHexToDecimal converts from string containing hex number to int
strHexToDecimal := func(hex string) int {
portInt, err := strconv.ParseInt(hex, 16, 64)
if err != nil {
log.WithFields(log.Fields{
"number": hex,
"error": err.Error(),
}).Fatal("Couldn't parse hex number")
}
return int(portInt)
}
// getOpenPorts gets a list of open/listening ports as integers
getOpenPorts := func() (ports []int) {
for _, port := range getHexPorts() {
ports = append(ports, strHexToDecimal(port))
}
return ports
}
// TODO check if it is in a valid range
port := wrkutils.ParseMyInt(parameters[0])
open := getOpenPorts()
for _, p := range open {
if p == port {
return 0, ""
}
}
// convert ports to string to send to wrkutils.GenericError
var strPorts []string
for _, port := range open {
strPorts = append(strPorts, fmt.Sprint(port))
}
return wrkutils.GenericError("Port not open", fmt.Sprint(port), strPorts)
}