forked from gyuho/linux-inspect
/
ss.go
239 lines (193 loc) · 4.48 KB
/
ss.go
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package inspect
import (
"bytes"
"fmt"
"log"
"os/user"
"sync"
"github.com/gyuho/linux-inspect/proc"
"github.com/gyuho/dataframe"
"github.com/olekukonko/tablewriter"
)
// SSEntry is a socket entry.
// Simplied from 'NetTCP'.
type SSEntry struct {
Protocol string
Program string
State string
PID int64
LocalIP string
LocalPort int64
RemoteIP string
RemotePort int64
User user.User
}
// GetSS finds all SSEntry by given filter.
func GetSS(opts ...OpFunc) (sss []SSEntry, err error) {
ft := &EntryOp{}
ft.applyOpts(opts)
var pids []int64
switch {
case ft.ProgramMatchFunc == nil && ft.PID < 1:
// get all PIDs
pids, err = proc.ListPIDs()
if err != nil {
return
}
case ft.PID > 0:
pids = []int64{ft.PID}
case ft.ProgramMatchFunc != nil:
// later to find PIDs by Program
pids = nil
default:
// applyOpts already panic when ft.ProgramMatchFunc != nil && ft.PID > 0
}
if len(pids) == 0 {
// find PIDs by Program
if pids, err = proc.ListPIDs(); err != nil {
return
}
} else {
// already know PIDs to query
ft.ProgramMatchFunc = func(string) bool { return true }
}
var pmu sync.RWMutex
var wg sync.WaitGroup
limitc := make(chan struct{}, maxConcurrentProcFDLimit)
f := func(pid int64, ttype proc.TransportProtocol) {
defer func() {
<-limitc
wg.Done()
}()
limitc <- struct{}{}
stat, err := proc.GetStatByPID(pid)
if err != nil {
log.Printf("proc.GetStatByPID error %v for PID %d", err, pid)
return
}
if !ft.ProgramMatchFunc(stat.Comm) {
return
}
pmu.RLock()
done := ft.TopLimit > 0 && len(sss) >= ft.TopLimit
pmu.RUnlock()
if done {
return
}
ents, err := getSSEntry(pid, ttype, ft.LocalPort, ft.RemotePort)
if err != nil {
log.Printf("getSSEntry error %v for PID %d", err, pid)
return
}
pmu.Lock()
sss = append(sss, ents...)
pmu.Unlock()
}
wg.Add(len(pids))
if ft.TCP && ft.TCP6 {
wg.Add(len(pids))
}
for _, pid := range pids {
if ft.TCP {
go f(pid, proc.TypeTCP)
}
if ft.TCP6 {
go f(pid, proc.TypeTCP6)
}
}
wg.Wait()
if ft.TopLimit > 0 && len(sss) > ft.TopLimit {
sss = sss[:ft.TopLimit:ft.TopLimit]
}
return
}
func getSSEntry(pid int64, tp proc.TransportProtocol, lport int64, rport int64) (sss []SSEntry, err error) {
nss, nerr := proc.GetNetTCPByPID(pid, tp)
if nerr != nil {
return nil, nerr
}
pname, perr := proc.GetProgram(pid)
if perr != nil {
return nil, perr
}
for _, elem := range nss {
u, uerr := user.LookupId(fmt.Sprintf("%d", elem.Uid))
if uerr != nil {
return nil, uerr
}
if lport > 0 && lport != elem.LocalAddressParsedIPPort {
continue
}
if rport > 0 && rport != elem.RemAddressParsedIPPort {
continue
}
entry := SSEntry{
Protocol: elem.Type,
Program: pname,
State: elem.StParsedStatus,
PID: pid,
LocalIP: elem.LocalAddressParsedIPHost,
LocalPort: elem.LocalAddressParsedIPPort,
RemoteIP: elem.RemAddressParsedIPHost,
RemotePort: elem.RemAddressParsedIPPort,
User: *u,
}
sss = append(sss, entry)
}
return
}
const columnsSSToShow = 9
var columnsSSEntry = []string{
"PROTOCOL",
"PROGRAM",
"STATE",
"PID",
"LOCAL-IP",
"LOCAL-PORT",
"REMOTE-IP",
"REMOTE-PORT",
"USER",
}
// ConvertSS converts to rows.
func ConvertSS(nss ...SSEntry) (header []string, rows [][]string) {
header = columnsSSEntry
rows = make([][]string, len(nss))
for i, elem := range nss {
row := make([]string, len(columnsSSEntry))
row[0] = elem.Protocol
row[1] = elem.Program
row[2] = elem.State
row[3] = fmt.Sprintf("%d", elem.PID)
row[4] = elem.LocalIP
row[5] = fmt.Sprintf("%d", elem.LocalPort)
row[6] = elem.RemoteIP
row[7] = fmt.Sprintf("%d", elem.RemotePort)
row[8] = elem.User.Username
rows[i] = row
}
dataframe.SortBy(
rows,
dataframe.StringAscendingFunc(1), // Program
dataframe.StringAscendingFunc(2), // State
dataframe.StringAscendingFunc(0), // Protocol
dataframe.StringAscendingFunc(3), // PID
dataframe.StringAscendingFunc(4), // LocalIP
).Sort(rows)
return
}
// StringSS converts in print-friendly format.
func StringSS(header []string, rows [][]string, topLimit int) string {
buf := new(bytes.Buffer)
tw := tablewriter.NewWriter(buf)
tw.SetHeader(header[:columnsSSToShow:columnsSSToShow])
if topLimit > 0 && len(rows) > topLimit {
rows = rows[:topLimit:topLimit]
}
for _, row := range rows {
tw.Append(row[:columnsSSToShow:columnsSSToShow])
}
tw.SetAutoFormatHeaders(false)
tw.SetAlignment(tablewriter.ALIGN_RIGHT)
tw.Render()
return buf.String()
}