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TCPポート使い切り事件
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T. MOTOOKA
May 27, 2024
Technology
1
420
TCPポート使い切り事件
めぐろLT #15 「みんなのしくじり大賞」
https://meguro-lt.connpass.com/event/314473/
T. MOTOOKA
May 27, 2024
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Transcript
Ί͙Ζ-5CZ!U@NPUPPLB 5$1ϙʔτ͍Γࣄ݅
w!U@NPUPPLB wϓϩάϥϚ wখ ͔Β w͔Β৬ۀϓϩάϥϚ wʹىۀͯ͠ɺݱࡏྵࡉاۀ🏚 wझຯ wtail -fͰαʔόͷϩάΛோΊΔ
wԻָԋ🎺 ྵࡉ:PV5VCFS wμʔπ🎯 "CPVUUIF4QFBLFS
w5$1ϙʔτ͍Γࣄ݅ wσʔλϕʔεͷQSJNBSZLFZআࣄ݅ wσʔλҠߦݩͷچγεςϜͷσʔλϕʔεʹओΩʔແ ͔ͬͨࣄ݅ w͋ͬʂʂʂ͜Μͳͱ͜Ζʹ੍ޚจࣈ͕ʂˠγες Ϝఀࢭࣄ݅ wϩʔυόϥϯαͷࢮ׆ޡఆࣄ݅ wݸਓใอޢ๏ҧͷ্࢘Λɺռ໔৬ʹ͢ΔΑ͏ ʹࠜճ͠͠Α͏ͱࣦͯ͠ഊͨ͠ࣄ݅ wͳͲͳͲʜ
͘͠͡Γ
5$1ϙʔτ͍Γࣄ݅ લ
wۀͷίʔϧηϯλʔ wฐࣾ ࣌ ɿ$3.γεςϜΛ։ൃͯ͠ӡ༻ w0ࣾɿిབྷΈͷγεςϜΛ։ൃͯ͠ӡ༻ w྆ऀͷؒͷ࿈ܞແ͠ wΦϖϨʔλ͞ΜɺిΛऔΔͱɺςϯϓϨԠ Λ͠ͳ͕Βɺ$3.γεςϜΛखಈͰి൪߸ ݕࡧͯ͠ސ٬ใҾ͖ग़͠ʢ໘ʣ ରγεςϜͷ֓گ
چγεςϜ
wۀͷίʔϧηϯλʔ wฐࣾ ࣌ ɿ$3.γεςϜΛ։ൃͯ͠ӡ༻ w0ࣾɿిབྷΈͷγεςϜΛ։ൃͯ͠ӡ༻ w྆ऀͷؒͷ࿈ܞ༗Γ wΦϖϨʔλ͞ΜखݩͰి͕໐ΔͱɺࣗಈͰ $3.γεςϜͷݕࡧ͕࣮ߦ͞ΕɺࣗಈͰ֘ސ ٬ใ͕ը໘ʹग़Δ ରγεςϜͷ֓گ
৽γεςϜ
None
None
None
w৽نͷ5$1ଓཁٻ͕ESPQ͞ΕΔ wϒϥβઢɿԆʑͱͨ͞ΕΔ wSFKFDUѻ͍ʹͳΔ͜ͱ͋ͬͨʁ wϒϥβઢɿଈ࠲ʹʮଓͰ͖·ͤΜͰ͠ ͨʯΤϥʔΛදࣔ wۀʹࢧো͕ग़ΔසͰ্ه͕ൃੜʢͰ ͳ͍ʣ ൃੜͨ͠ࣄ
😇
wݩʑɺ5$1ଓ্ݶۙ͘ʹୡͯͨ͠આʢͦ͜ ʹগ͠ͷଓ૿͕དྷ͚ͨͩͰΒΕͨઆʣ w)551ͷ,FFQ"MJWFͷλΠϜΞτ͕ա ͗ͨઆ wిΛऔΒͳ͍߹ɺSJOH์ஔͰଞͷਓʹ ి͕ճΔઃఆɺͱͷ߹Θٕͤʁ w00.આ 5$1ཧ༻ͷϝϞϦྖҬ͚ͩރׇઆ wΒͳ͍ͱ͜ΖͰSFUSZͯͨ͠આʢʣ
wͳͲʜ ݪҼ ਪଌ
wϦΞϧλΠϜੑͷ͍෦ͷਓ$3.ݟͳ͍Α ͏ཁ wλϒ͙͢ด͡ΔΑ͏ཁ wۮવαʔόϧʔϜʹస͕͍ͬͯͨ৽αʔόΛٸᬎ ຊ൪ಋೖͯ͠ෛՙࢄߏʹʢ࣌ؒޙʣ ˠԠٸાஔͱͯ͠ᘳ͕ͩͬͨۮવʹա͗ͳ͍ ରॲɿ࣮ࡍʹऔͬͨͷ
w͖ͪΜͱͨ͠ݪҼڀ໌ wۀ෮ؼ͕࠷༏ઌ wԠٸાஔ͕ऴΘΔͱ͑ͳ͘ͳΔ😇 w,FFQ"MJWFΛP ff ʹ wӅṭ͞ΕͨߏͩͬͨͷͰஅ೦ wணి࣌ͷ$3.ͷސ٬ݕࡧػೳΛP ff ʹ
wमਖ਼ʹ͍͕͔͔࣌ؒ͢͝Γͦ͏Ͱஅ೦ ରॲɿͰ͖ͳ͔ͬͨ͜ͱ
wෛՙςετେࣄ wෛՙͷ؍৭ʑ͋Δʢ࿙Εͯͨʣ wʮෛՙ૿͑ͳͦ͞͏ʯʹݟ࣮͑ͯʜ😰 wΓ͠खॱେࣄ wGBJMTPGUͳγεςϜઃܭେࣄ ڭ܇
w5$1ϙʔτ͍Γࣄ݅✅ wσʔλϕʔεͷQSJNBSZLFZআࣄ݅ wσʔλҠߦݩͷچγεςϜͷσʔλϕʔεʹओΩʔແ ͔ͬͨࣄ݅ w͋ͬʂʂʂ͜Μͳͱ͜Ζʹ੍ޚจࣈ͕ʂˠγες Ϝఀࢭࣄ݅ wϩʔυόϥϯαͷࢮ׆ޡఆࣄ݅ wݸਓใอޢ๏ҧͷ্࢘Λɺռ໔৬ʹ͢ΔΑ͏ ʹࠜճ͠͠Α͏ͱࣦͯ͠ഊͨ͠ࣄ݅ wͳͲͳͲʜ
͘͠͡ΓɿଞͷަྲྀձͰʜ