netstat -s コマンドっぽい表示をシェルで実現する
最近のLinuxはデフォルトではnet-toolsのコマンド(ifconfig、netstat等)はインストールされておらず、代わりにiproute2(ip、ss等)の使用を推奨していたりする。多くの先人の方がnet-toolsからiproute2へ移行する人向けにコマンド対応の一覧まとめて展開してくれているので大抵のコマンドは困らないで済む(ありがたや)。
orebibou.com
対応するコマンドがない...
だけど、１つだけどんなに調べても対応するコマンドが見つからない。
それは、ネットワーク統計を表示するnetstat -s だ。
(いや、あるよって方がいたら教えてください)
先人の方々がまとめた記事を見ると、"ss -s"を代替コマンドとしている方が多いのだが実際のコマンド結果を見ると欲しいのはソレじゃない感スゴイ。(私だけ？)
netstat -sの表示
[user@localhost ~]$ netstat -s
Ip:
6027 total packets received
0 forwarded
0 incoming packets discarded
5464 incoming packets delivered
2966 requests sent out
Icmp:
0 ICMP messages received
0 input ICMP message failed.
ICMP input histogram:
0 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
Tcp:
26 active connections openings
1 passive connection openings
0 failed connection attempts
0 connection resets received
1 connections established
5432 segments received
3024 segments send out
1 segments retransmited
0 bad segments received.
0 resets sent
Udp:
32 packets received
0 packets to unknown port received.
0 packet receive errors
32 packets sent
0 receive buffer errors
0 send buffer errors
UdpLite:
TcpExt:
24 TCP sockets finished time wait in fast timer
39 delayed acks sent
1 packets directly queued to recvmsg prequeue.
1547 packet headers predicted
1601 acknowledgments not containing data payload received
1243 predicted acknowledgments
1 congestion windows recovered without slow start after partial ack
1 other TCP timeouts
TCPRcvCoalesce: 2
TCPSynRetrans: 1
TCPOrigDataSent: 2843
IpExt:
InNoRoutes: 1
InBcastPkts: 562
InOctets: 603244
OutOctets: 699661
InBcastOctets: 103309
InNoECTPkts: 6032
ss -sの結果
[user@localhost ~]$ ss -s Total: 184 (kernel 0) TCP: 8 (estab 1, closed 0, orphaned 0, synrecv 0, timewait 0/0), ports 0 Transport Total IP IPv6 * 0 - - RAW 3 0 3 UDP 3 2 1 TCP 8 4 4 INET 14 6 8 FRAG 0 0 0
これは、いくらなんでも端折りではないだろうか...
そもそも、ss -s はヘルプをみるとソケットのサマリーと書いてあってネットワークの統計とは言ってない。
無ければ作る
net-toolsをインストールすれば済む話ですが、それは何だか負けた気がするので自分で代わりのコマンド(シェルスクリプト)を作ってみた。
netstat-s.sh
[user@localhost ~]$ cat netstat-s.sh #!/bin/sh TMPFILE=`mktemp` INDENT=' ' trap 'rm -f $TMPFILE;exit' 2 function SHAPING_PSTAT () { KINDS=(`cut -d ":" -f1 $1 | awk '!tmp[$0]++'`) for entry in `seq 1 ${#KINDS[@]}` do ENT=(`grep "${KINDS[$entry-1]}:" $1 | sed -e s/"${KINDS[$entry-1]}:"//g | head -n 1`) VAL=(`grep "${KINDS[$entry-1]}:" $1 | sed -e s/"${KINDS[$entry-1]}:"//g | tail -n 1`) printf "${KINDS[$entry-1]}:\n" for index in `seq 1 ${#ENT[@]}` do printf "$INDENT%-30s%-20d\n" ${ENT[$index-1]} ${VAL[$index-1]} done done } cat /proc/net/snmp > $TMPFILE SHAPING_PSTAT $TMPFILE cat /proc/net/netstat > $TMPFILE SHAPING_PSTAT $TMPFILE rm -f $TMPFILE
表示結果
[user@localhost ~]$ ./netstat-s.sh
Ip:
Forwarding 2
DefaultTTL 64
InReceives 6339
InHdrErrors 0
InAddrErrors 0
ForwDatagrams 0
InUnknownProtos 0
InDiscards 0
InDelivers 5613
OutRequests 3052
OutDiscards 0
OutNoRoutes 0
ReasmTimeout 0
ReasmReqds 0
ReasmOKs 0
ReasmFails 0
FragOKs 0
FragFails 0
FragCreates 0
Icmp:
InMsgs 0
InErrors 0
InCsumErrors 0
InDestUnreachs 0
InTimeExcds 0
InParmProbs 0
InSrcQuenchs 0
InRedirects 0
InEchos 0
InEchoReps 0
InTimestamps 0
InTimestampReps 0
InAddrMasks 0
InAddrMaskReps 0
OutMsgs 0
OutErrors 0
OutDestUnreachs 0
OutTimeExcds 0
OutParmProbs 0
OutSrcQuenchs 0
OutRedirects 0
OutEchos 0
OutEchoReps 0
OutTimestamps 0
OutTimestampReps 0
OutAddrMasks 0
OutAddrMaskReps 0
Tcp:
RtoAlgorithm 1
RtoMin 200
RtoMax 120000
MaxConn -1
ActiveOpens 26
PassiveOpens 1
AttemptFails 0
EstabResets 0
CurrEstab 1
InSegs 5581
OutSegs 3112
RetransSegs 1
InErrs 0
OutRsts 0
InCsumErrors 0
Udp:
InDatagrams 32
NoPorts 0
InErrors 0
OutDatagrams 32
RcvbufErrors 0
SndbufErrors 0
InCsumErrors 0
UdpLite:
InDatagrams 0
NoPorts 0
InErrors 0
OutDatagrams 0
RcvbufErrors 0
SndbufErrors 0
InCsumErrors 0
TcpExt:
SyncookiesSent 0
SyncookiesRecv 0
SyncookiesFailed 0
EmbryonicRsts 0
PruneCalled 0
RcvPruned 0
OfoPruned 0
OutOfWindowIcmps 0
LockDroppedIcmps 0
ArpFilter 0
TW 24
TWRecycled 0
TWKilled 0
PAWSPassive 0
PAWSActive 0
PAWSEstab 0
DelayedACKs 43
DelayedACKLocked 1
DelayedACKLost 0
ListenOverflows 0
ListenDrops 0
TCPPrequeued 1
TCPDirectCopyFromBacklog 0
TCPDirectCopyFromPrequeue 0
TCPPrequeueDropped 0
TCPHPHits 1599
TCPHPHitsToUser 0
TCPPureAcks 1638
TCPHPAcks 1288
TCPRenoRecovery 0
TCPSackRecovery 0
TCPSACKReneging 0
TCPFACKReorder 0
TCPSACKReorder 0
TCPRenoReorder 0
TCPTSReorder 0
TCPFullUndo 0
TCPPartialUndo 0
TCPDSACKUndo 0
TCPLossUndo 1
TCPLostRetransmit 0
TCPRenoFailures 0
TCPSackFailures 0
TCPLossFailures 0
TCPFastRetrans 0
TCPForwardRetrans 0
TCPSlowStartRetrans 0
TCPTimeouts 1
TCPLossProbes 0
TCPLossProbeRecovery 0
TCPRenoRecoveryFail 0
TCPSackRecoveryFail 0
TCPSchedulerFailed 0
TCPRcvCollapsed 0
TCPDSACKOldSent 0
TCPDSACKOfoSent 0
TCPDSACKRecv 0
TCPDSACKOfoRecv 0
TCPAbortOnData 0
TCPAbortOnClose 0
TCPAbortOnMemory 0
TCPAbortOnTimeout 0
TCPAbortOnLinger 0
TCPAbortFailed 0
TCPMemoryPressures 0
TCPSACKDiscard 0
TCPDSACKIgnoredOld 0
TCPDSACKIgnoredNoUndo 0
TCPSpuriousRTOs 0
TCPMD5NotFound 0
TCPMD5Unexpected 0
TCPSackShifted 0
TCPSackMerged 0
TCPSackShiftFallback 0
TCPBacklogDrop 0
TCPMinTTLDrop 0
TCPDeferAcceptDrop 0
IPReversePathFilter 0
TCPTimeWaitOverflow 0
TCPReqQFullDoCookies 0
TCPReqQFullDrop 0
TCPRetransFail 0
TCPRcvCoalesce 2
TCPOFOQueue 0
TCPOFODrop 0
TCPOFOMerge 0
TCPChallengeACK 0
TCPSYNChallenge 0
TCPFastOpenActive 0
TCPFastOpenActiveFail 0
TCPFastOpenPassive 0
TCPFastOpenPassiveFail 0
TCPFastOpenListenOverflow 0
TCPFastOpenCookieReqd 0
TCPSpuriousRtxHostQueues 0
BusyPollRxPackets 0
TCPAutoCorking 0
TCPFromZeroWindowAdv 0
TCPToZeroWindowAdv 0
TCPWantZeroWindowAdv 0
TCPSynRetrans 1
TCPOrigDataSent 2925
TCPHystartTrainDetect 0
TCPHystartTrainCwnd 0
TCPHystartDelayDetect 0
TCPHystartDelayCwnd 0
TCPACKSkippedSynRecv 0
TCPACKSkippedPAWS 0
TCPACKSkippedSeq 0
TCPACKSkippedFinWait2 0
TCPACKSkippedTimeWait 0
TCPACKSkippedChallenge 0
IpExt:
InNoRoutes 1
InTruncatedPkts 0
InMcastPkts 0
OutMcastPkts 0
InBcastPkts 725
OutBcastPkts 0
InOctets 647580
OutOctets 720269
InMcastOctets 0
OutMcastOctets 0
InBcastOctets 133265
OutBcastOctets 0
InCsumErrors 0
InNoECTPkts 6355
InECT1Pkts 0
InECT0Pkts 0
InCEPkts 0
単に/proc/net/snmpと/proc/net/netstatを整形して表示するだけ。
IPv6系は/proc/net/snmp6を直接catで覗けばよい。
[参考]
逆引きシェルスクリプト/スペース区切りの文字列を配列に格納する方法 - Linuxと過ごす
ソートしないで重複行を削除する - Qiita
