Rustで作るLinuxトレーサ / libbpf-core-with-rust

@RustのLT会 Shinjuku.rs #15
https://forcia.connpass.com/event/206698/

1. F#1'ͱ͔͍͏ࠓྲྀߦͬͯΔ΍ͭ 6DIJP
   ,POEP
   
   (.0
   1FQBCP
   *OD
   
   4IJOKVLVST
    3VTUͰ࡞Δ-JOVYτϨʔα 1IPUP
   CZ
   )FSCFSU
   #JFTFS
   
   IUUQTQJYBCBZDPNJNBHFTJE
   
2. γχΞɾϓϦϯγύϧΤϯδχΞ ۙ౻ Ӊஐ࿕ / @udzura https://blog.udzura.jp/ Uchio Kondo ٕज़෦ ٕज़ج൫νʔϜ @ GMOϖύϘ / ෱Ԭ ΤϯδχΞΧϑΣʢ෱Ԭࢢ੺ẂנจԽձؗʣ αϙʔλʔ Duolingo Diamond Leaguer 💎 #Rust #Ruby #mruby #Containers #eBPF #CRIU #Seccomp #RubyKaigi #CloudNativeDays #Zumba #γϨϯ #FitBoxing2
3. ࠓճ࿩͢΋ͷҎ֎ʹ࡞ͬͨ΋ͷ •octx wίϚϯυҰൃͰࡶʹ(JU)VCͷBDUJWJUZΛ$47ʹͯ͘͠ΕΔ΍ͭ
   ͦͷ··#JH2VFSZͰϩʔυՄೳɻ
   wPDUPDSBC
   SFRXFTU
   UPLJP
4. 5P$ w࡞Ζ͏ͱ͍ͯ͠Δπʔϧͷ࿩
   wF#1'
   ͱ͸
   wࠓࠓͰ͖͍ͯΔ΋ͷ
   wMJCCQGST
   ͷ࢖͍ํ
   w3VTU
   ͰΑ͔ͬͨ఺
5. F#1'
6. F#1' wFYUFOEFE
   #FSLMFZ
   1BLFU
   'JMUFS
   w
   ೥͔Β-JOVYͰಋೖʢݩͷ࣮૷͸-JOVYͰ͸͔Βʣ
   wMJCQDBQͰ࢖ΘΕ͍͕ͯͨɺTFDDPNQ΍ͦͷଞΧʔωϧػೳͰར༻
   w-JOVYΧʔωϧ಺෦Ͱಈ͘ϓϩάϥϜΛɺϢʔβϥϯυͰهड़
   wػೳʹ੍ݶ͕͋ΓɺϑΟϧλϦϯά΍ूܭ͕ओͳ໾ׂ
   wৄࡉ͸ʮ͓͍ͯͭ͘͠Α͘ͳΔ
   F#1'ʯͰݕࡧ
7. F#1'
   ʹΑΔτϨʔα wF#1'
   ͷେ͖ͳ༻్ͷҰͭʹɺΧʔωϧ಺෦Ͱͷؔ਺ݺͼग़͠΍
   ੩తͳΠϕϯτͳͲΛτϨʔε͠ɺूܭ͢Δ͜ͱ͕͋Δɻ
   w #4%4PMBSJT
   Ͱ͍͏%5SBDF
   wCQGUSBDF
   ίϚϯυ΍
   
   #$$ #1'
   $PNQJMFS
   $PMMFDUJPO
   ͷ։ൃ IUUQXXXCSFOEBOHSFHHDPNCMPHCQGQFSGPSNBODFUPPMTCPPLIUNM
   
8. #1'
   $03& wͦΕ·Ͱͷ#1'πʔϧ͸ɺͦͷ৔Ͱ#1'ϓϩάϥϜΛੜ੒ɺίϯύΠ ϧ͢ΔͳͲʢॊೈͰ͸͋Δ͕ʣΦʔόʔϔου͕͋ͬͨɻ
   wͦͷ݁Ռɺಈ࡞ʹ
   DMBOH
   όΠφϦ͕ඞཁͩͬͨΓɺಋೖ͕ϋʔυ
   w΋͏গ͠खܰʹಈ͔ͤΔΑ͏ɺΧʔωϧͷܕ৘ใΛऔಘ͢Δ#5'΍ɺ $03& $PNQJMF
   0ODF
   3VO
   &WFSZXIFSF
   ͳͲͷٕज़͕ग़ͯ͘Δ
   w$03&
   ʹͳΔͱϫϯόΠφϦπʔϧ Χʔωϧͷઃఆ͍͔ͭ͘ ΛΠ ϯετʔϧ͢Ε͹τϨʔε͕Ͱ͖ΔΑ͏ʹɻ
9. ࣮૷ͷྫ w
   #1'
   ͷϓϩάϥϜΛϏϧυ͢Δ $Ͱॻ͘ඞཁ͕͋ΔɻϓϩάϥϜͷҰ෦ ίϯύΠϧ࣌ͷΦϓγϣϯ
10. ࣮૷ͷྫ w
    #1'ϓϩάϥϜͷΦϒδΣΫτ͔ΒTLFMʢϔομʣΛੜ੒͠ɺ
    Ϣʔβϥϯυͷ$ϓϩάϥϜ͔Β࢖͑ΔΑ͏ʹ͢Δ CQGUPPM
    ͱ͍͏ίϚϯυͰੜ੒
    ϓϩάϥϜͷόΠφϦࣗମ͕ϔομʹຒΊࠐ·ΕΔ
11. ࣮૷ͷྫ w
    ͦͷϔομΛ࢖ͬͯόΠφϦπʔϧΛ࡞Δɻ
    w$ݴޠͰɻ
    wͪͳΈʹCDDͰͷSFGFSFODF࣮૷
    w IUUQTHJUIVCDPNJPWJTPSCDDUSFFNBTUFSMJCCQGUPPMT
    
12. ग़དྷ্͕ͬͨόΠφϦͷΠϝʔδ Ϣʔβϥϯυ Χʔωϧ಺෦ ϓϩάϥϜʢϫϯόΠφϦʣ #1'ϓϩάϥϜ ϩʔυ σʔλ΍ΓऔΓ ϓϩάϥϜ
    ࣮ߦɾूܭ Φϓγϣϯͷղੳ ग़ྗ Ճ޻ #1' ࣮ߦ࣌ݕࠪ #1'
    .BQ 1FSG
    CV⒎FS ར༻ऀ
13. ͜͜·Ͱͷͬ͘͟Γͨ͠·ͱΊ wF#1'͍ͬͯ͏-JOVYͷτϨʔαͳͲΛ࡞Δศརٕज़͕͋Δ
    wF#1'πʔϧ͸ɺҎલ͸DMBOHͰͦͷ৔ͰίϯύΠϧ͍͕ͯͨ͠ɺ
    ࠷ۙϫϯόΠφϦͰ഑ΕΔΑ͏ʹͳͬͨ ཁ৽͍͠Χʔωϧ
    wͦ͏͢ΔͱίϚϯυϥΠϯπʔϧ෦෼΋ؚΊͯϫϯόΠφϦʹ͍ͨ͠
    wͦͷ
    SFGFSFODF
    ࣮૷͸
    $ݴޠɻ$ݴޠɻ ʮ1SPEVDUJPO
    Ͱ͸
    #$$
    ΑΓ
    MJCCQG
    
    #1'
    $03&
    Λ࢖͏ํ͕ྑ͍ʯ
    IUUQTJUJTLKIBUFOBCMPHDPNFOUSZ
    ͳͲ΋ࢀর
14. Ϣʔβϥϯυ΋$ݴޠͰ͋Δඞཁ wͬͯɺຊ౰ʹ͋Δʁ
    w$ݴޠͷ೉͠͞
    wΦϓγϣϯύʔεҰͭͰ΋จࣈྻͷѻ͍ʹۤ࿑͢Δ
    wͪΐͬͱͨ͜͠ͱͰ΋ෆ҆શͳίʔυ͕
    wϝϞϦͷѻ͍͕ϝϞϦ͕
    w#1'ϓϩάϥϜ͸࢓ํͳ͍ʢWFSJpFS΋͋Δʣ͚ͲɺϢʔβϥϯυ΋ $ͬͯେม͡Όͳ͍ʁ
15. ͦ͜Ͱ
    3VTU
16. ͭͬͨ͘΋ͷ
17. DPOUBJOFSUSBDFST wίϯςφؔ܎ͷτϨʔεʹಛԽͨ͠πʔϧ܈Λ࡞Ζ͏ͱ͍ͯ͠Δ
    w൚༻తͳ΋ͷ͸͢Ͱʹ͋ΔͷͰ
    w3VTU
    
    MJCCQGST
    w$03&ͳͷͰΧʔωϧ͕
    ͔ͳΓ৽͘͠ͳ͍ͱͰ͕͢ IUUQTHJUIVCDPNVE[VSBDPOUBJOFSUSBDFSTɹ
18. DPOTUBU  wίϯςφ୯ҐͰͷ
    γεςϜίʔϧݺͼग़͠ͷ
    ౷ܭΛදࣔ͢Δ
19. VOTIBSFTOPPQ  wVOTIBSF 
    ͱ͍͏ɺίϯςφΛ࡞੒͢Δ্ͰॏཁͳγεςϜίʔϧ ͷݺͼग़͠ͱɺͦͷϑϥάΛτϨʔε͢Δ
20. DPOCJPHSBQI  wίϯςφ୯ҐͰɺCMPDL
    *0ͷঢ়گΛՄࢹԽ͢Δɻ
    wάϥϑදࣔͰ͸ͬͪΌ͚͗ͨ͢ͷͰɺ΋͏গ͠ݟ΍͍͢දࣔΛࠓޙ࣮ ૷͍ͨ͠ʜ
21. %FNP wDPOTUBU  ࠓࢥ͏ͱQFSGͰ΋Ͱ͖Δؾ΋
    ҰԠύϑΥʔϚϯεʹ༏ΕΔ
    ͸ͣ ˞
    ಈը͸Ͳ͔͜ʹΞοϓ͠·͢
22. MJCCQGST
23. MJCCQGST
    ͱ͸ wF#1'ͷػೳΛ΋͏গ͠ΞΫηε͠΍͘͢ϥοϓͨ͠ϥΠϒϥϦͱ͠ ͯ
    MJCCQG
    ͱ͍͏΋ͷ͕͋Δɻ
    w#1'ϓϩάϥϜͷϩʔυ
    w#1'
    .BQ΍QFSG
    CV⒎FSͳͲσʔλͷ΍ΓऔΓͷΠϯλϑΣʔε
    wMJCCQG
    ͸$ϥΠϒϥϦͳͷͰɺ3VTU͔Β࢖͍΍ͨ͘͢͠΋ͷ͕
    MJCCQGST
    ɻ
24. جຊతͳ࢖͍ํ wCQGϓϩάϥϜΛॻ͘
    w cargo libbpf build
    ͰίϯύΠϧͰ͖Δ
    w cargo libbpf gen
    Ͱ3VTUͷTLFMΛੜ੒
    w͋ͱ͸ͦͷTLFMΛ࢖ͬͯ3VTUϓϩάϥϜΛॻ͘
    wMJCCQGSTͷػೳʹՃ͑ͯɺTUSVDUPQU
    DUSMD
    BOZIPX
    ͦͷଞී௨ͷ 3VTUͷίϚϯυϥΠϯπʔϧͱͯ͠ϓϩάϥϜΛॻ͚͹0,
25. NBJO
    ͷྫ ϏϧμʔΛܦ༝ͯ͠
    TLFMΛ։͘ ύϥϝʔλΛೖΕͯ
    TLFMΛϩʔυɺΞλον F#1'ͷΠϯλϑΣʔε͔Β
    σʔλΛऔಘɺදࣔ
26. σʔλදࣔͷྫʢQFSG
    CV⒎FSʣ wσʔλදࣔ༻ͷίʔϧόοΫؔ਺Λఆٛɻσʔλࣗମ͸
    &[u8]
    Ͱ
    ΍ͬͯ͘ΔͷͰɺ
    QMBJO
    DSBUF
    Ͱม׵ͷඞཁ͕͋Δɻ SFQS D
    ͳߏ଄ମʹ
    1MBJO
    Λ࣮૷
27. σʔλදࣔͷྫʢ#1'
    .BQʣ w#1'
    .BQͱ͍͏σʔλूੵମΛܦ༝ͯ͠ɺΧʔωϧͰूΊͨσʔλ ʹϢʔβϥϯυ͔ΒΞΫηεɺදࣔͰ͖Δɻ ߏ଄ମఆٛΛ$3VTUͰ߹ΘͤΔ LFZ
    
    WBMVF
    ͱ΋ʹ
    &[u8]
    ͳͷͰɺ͜͜Ͱ΋ม׵
28. Ϣʔβϥϯυ͔Β#1'
    .BQΛߋ৽ wඵຖʹΧ΢ϯλϦηοτ͢ΔΑ͏ͳϓϩάϥϜΛॻ͚Δɻ
    ॻ͚Δ͚ͲɺMap::update()
    ͕LFZWBMVFͱ΋ʹ
    &[u8]
    Λཁٻ͢Δͷ Ͱɺ͜͜΋ม׵
    ͔͠΋VOTBGF plain::as_bytes()
    ͰͰ͖Δ͚Ͳ
29. <3VTU
    ௿ϨΠϠ
    ϝϦοτ>
30. θϩίετந৅Խͷڧ྽͞ w؆ܿʹએݴతʹॻ͍ͯ΋ɺεϐʔυͷ͜ͱΛؾʹ͠ͳ͍͍ͯ͘ɺͱ͍ ͏ͷ͸͍͍ମݧɻ
    wΤϥʔΛ
    Result<T, E>
    Ͱѻ͑Δ͚ͩͰ΋ੜ࢈ੑΊͬͪΌߴ͍
    w΋ͪΖΜϝϞϦ΋ʢجຊతʹ͸ʣ҆શ
    wίϚϯυϥΠϯπʔϧͰ͸
    TUSVDUPQU
    ͕͍͍
    wͱʹ͔͘
    TUSVDUPQU
    ͕͍͍ʢճ໨ʣ
31. ๛෋ͳ
    DSBUF
    Λ࢖͑Δ wίΞͰͳ͍෦෼ͷ࠶ൃ໌͸ਏ͍ͷͰɺ͍͍ײ͡ͷ࣮૷ʹ৐͔ͬΓ͍ͨ
    wΦϓγϣϯύʔαɺ''*ɺՄࢹԽ
    wUFYUQMPUT
    ͍͍
    wDBSHP
    ͕ͦ΋ͦ΋
    ͍͍ɺXZDBUT
32. ''*ʹڧ͍ wࠓճͷMJCCQGͷΑ͏ʹɺ$ݴޠϕʔεʢ͔͠΋-JOVYΧʔωϧͱҰॹʹ ϝϯς͞Ε͍ͯΔʣͷͰ͔͍ϥΠϒϥϦΛૉ௚ʹ࢖͑Δͷ͸͍͍
    w3VTU
    
    $
    Ͱߏ଄ମɺϙΠϯλΛ΍ΓͱΓ͠΍͍͢ͷ͸ॿ͔Δ
    w࣌ʹ͸
    VOTBGF
    ʹͳΔ͚Ͳ
33. ࠔͬͯΔ͜ͱͱ͔ࠓޙ
34. ࠓޙͷ՝୊ wͱ͸͍͑
    VOTBGF
    ͕ଟ͍ؾ͕͢ΔɺͳΜͱ͔ͳΒͳ͍͔ͳ
    w1MBJO
    DSBUF
    ʹཔ͍ͬͯΔͱ͜ΖΛ΋ͬͱ͏·͘Ӆ͢ͱ͍͍ͷ͔΋
    wͱ͍͏͔ɺ
    MJCCQG@ST
    ͕
    &[u8]
    Λཁٻ͗͢͠
    w''*
    पΓͷػೳ͸·ͩௐ΂࢝Ίͨ͹͔ΓͰɺ$ݴޠΈ͍ͨͳॻ͖ํʹ ͳͬͯ͠·͏ɻཁݚڀɻ
35. ͦͷଞ΍Γ͍ͨ͜ͱ wπʔϧͱͯ͠΋͏গ͠খճΓΛྑ͍ͨ͘͠ɻ
    wΦϓγϣϯ૿΍ͨ͠Γɺ΋ͬͱ৭ʑͳϝτϦοΫΛऔΓ͍ͨ
    wӳޠͱ͔ͰهࣄΛॻ͍ͨํ͕ड͚ͦ͏ɻॻ͘ɻ
    w͋ͱ͸ɺࣗ෼Ͱ͋·Γ࢖͑ͯͳ͍ͷͰ࢖ͬͯΈΔɻ