ホスティングにおける fuse の利用

ϨΨγʔγεςϜΛࢧ͑Δٕज़ ݪޱफޛ(.01FQBCP *OD )PTUJOH$BTVBM5BMLT ϗεςΟϯάʹ͓͚ΔGVTFͷར༻

໨࣍ wϩϦϙοϓʂͷ঺հ wγεςϜߏ੒ͷఀ଺ wGVTFCJOEFYͷ঺հ

ΠϯϑϥΤϯδχΞ ݪޱफޛ!IBSBTPV ϗεςΟϯάࣄۀ෦ϗεςΟϯάάϧʔϓ  ΠϯϑϥνʔϜ೥໨ʢ࠽ʣ IUUQTIBSBTPVKQ

ϩϦϙοϓʂͷ͝঺հ

ϩϦϙοϓʂͷྺ࢙Πϯϑϥฤ w஀ੜɻ͘͞Β͞Μͷઐ༻αʔόΛར༻ɻ  શϩʔϧʢXFC NBJM ECʣΛ୆ʹࡌͤͨߏ੒ɻ  ࠷ऴతʹ୆͙Β͍ w(.0ͷσʔληϯλʔ΁ɻϩʔϧ͝ͱʹઐ༻αʔόΛཱͯΔ ߏ੒ʹมߋɻϦόʔεϓϩΩγͷಋೖ΋͜ͷλΠϛϯά w8PSEQSFTTͷେن໛վ͟Μʢݖݶෆඋˍ'PMMPX4ZNMJOLTʣ wNPE@QIQಋೖ
wϦόʔεϓϩΩγΛBQBDIFˠOHJOYʹɻIUUQରԠ wແྉ44-ಋೖʢOHY@NSVCZʣ ೥ ೥ ೥ ೥ ೥

ϩϦϙοϓʂͷߏ੒ wߏஙɿDPCCMFSQVQQFUʹΑΔߏங w؂ࢹɿOBHJPTNPOJUʹΑΔ؂ࢹ wߏ੒ɿ wΧελϚʔ%#ͱ࿈ܞ͢ΔQFSMͰ࡞੒͞Εͨ"1*܈ wϩʔυόϥϯαˠϦόʔεϓϩΩγˠ8&#αʔόͷ̏ஈߏ੒ w8&#αʔόɿ w"QBDIFΛ࢖༻ wϢʔβ͕IUBDDFTTΛར༻͍ͯ͠ΔͨΊOHJOYͳͲ΁ͷ৐Γ׵͕͑ ೉͍͠ɻMJUFTQFFEʁ

͜ͷߏ੒ɺ ೥ؒ΄ͱΜͲมΘ͍ͬͯͳ͍ʜ

มԽ͸େࣄ

ͳΊΒ͔ͳγεςϜ

ͳΊΒ͔ͳγεςϜͱ͸ ग़యɿIUUQTTQFBLFSEFDLDPNNBUTVNPUP@SOVNCFSIPTDPOOBNFSBLBE

ʮαʔόͷഁյͱ࠶ߏஙʯ

ͳΊγεͷҰา αʔό্ʹ͔͠ͳ͍σʔλͱ͔ ͋ͬͨΒɺ·͍ͣΑͶʁ

ͳΊγεͷҰา w·ͣ͸ʮ"QBDIFͷWIPTUΛ%#Խʯ͠Α͏ w࢒೦ͳ͕Βɺݱঢ়ͷNPE@NSVCZͰ͸ແཧ w͍Ζ͍Ζ͋ΔNPE@WIPTUYYYͱ࢖͑͹ɺ͍͚ͦ͏Ͱ͸͋Δ wͰ΋ɺ΄ͱΜͲϝϯς͞Εͯͳ͍͠ɺ͓΋͠ΖΈ͕ͳ͍

Ͱɺ࡞Γ·ͨ͠ɻ GVTFCJOEFY

GVTFCJOEFYͷએ఻

GVTFCJOEFYͷಛ௃ wϢʔβۭؒͰϑΝΠϧγεςϜΛ࣮૷ՄೳͳMJCGVTFΛ͔ͭͬͯɺಠࣗ ͷϑΝΠϧγεςϜΛ࡞੒ w࣮ߦϑΝΠϧΛɺಠࣗϑΝΠϧγεςϜʢGVTFCJOEFYEʣܦ༝Ͱ PQFOSFBEʢྫ͑͹DBUʣ͢Δͱɺର৅ͷϑΝΠϧΛFYFDWFͨ͠ ݁Ռ͕ฦΔ # cat /var/lib/bindex/now Thu
Mar 21 20:02:01 UTC 2019 # # cat /var/lib/bindex/now Thu Mar 21 20:02:07 UTC 2019

GVTFCJOEFY४උ # ls -l /opt/bindex/ /var/lib/bindex/ /opt/bindex/: total 4 -rw-r--r--
1 root root 18 Mar 21 19:52 now /var/lib/bindex/: total 0 # # bindexd /opt/bindex/ /var/lib/bindex/ # # ls -l /opt/bindex/ /var/lib/bindex/ /opt/bindex/: total 4 -rw-r--r-- 1 root root 18 Mar 21 19:52 now /var/lib/bindex/: total 4 -rw-r--r-- 1 root root 18 Mar 21 19:52 now wCJOENPVOUͷ༷ʹ  ʮϚ΢ϯτݩʢ/opt/bindexʣʯͱ  ʮϚ΢ϯτઌʢ/var/lib/bindexʣʯΛ ༻ҙ͠CJOEFYEΛ࣮ߦ wϚ΢ϯτઌʢ/var/lib/bindexʣʹ΋  Ϛ΢ϯτݩͱಉ͡ϑΝΠϧ͕ݟ͑Δ

GVTFCJOEFY࣮ߦྫ # cat /opt/bindex/now #!/bin/bash date # # cat /var/lib/bindex/now
#!/bin/bash date wϚ΢ϯτݩʢ/opt/bindexʣʹ͋Δ ϑΝΠϧ͸ɺϚ΢ϯτઌʢ/var/lib/ bindexʣͰ΋ಉ༷͡ʹݟ͑Δ  wϚ΢ϯτݩʢ/opt/bindexʣͷϑΝΠ ϧ͕ʮ࣮ߦϑΝΠϧʯͩͬͨ৔߹ɺ  Ϛ΢ϯτઌͰͦͷϑΝΠϧΛPQFO SFBEʢDBUʣ͢Δͱɺ  ࣮ߦϑΝΠϧΛFYFDWFͨ݁͠Ռʢඪ ४ग़ྗɾඪ४Τϥʔग़ྗʣ͕ฦΔ # chmod +x /opt/bindex/now # # cat /var/lib/bindex/now Thu Mar 21 20:02:01 UTC 2019 # # cat /var/lib/bindex/now Thu Mar 21 20:02:07 UTC 2019

GVTFCJOEFY૝ఆར༻γʔϯ ϛυϧ΢ΣΞʹҙࣝͤ͞ͳ͍ܗͰɺઃఆϑΝΠϧͳͲΛಈతͳ෺ʹ  มߋͰ͖Δɻ wBQBDIFͷઃఆϑΝΠϧ wIPTUT w44-ূ໌ॻ wSTZOEDPOG wFUD

GVTFCJOEFY࣮૷ PQFOTZTUFNDBMM int bindex_open(const char *path, struct fuse_file_info *fi) {
: if (should_execute(&buf)) { : if ((fd = mkonetimefd()) == -1) { return -errno; } if ((pid = fork()) < 0) { return -errno; } /* child */ if (pid == 0) { dup2(fd, 1); dup2(fd, 2); argv[0] = (char *)real_path; argv[1] = NULL; execve(real_path, argv, environ); ࣮ߦϑΝΠϧ͔൑ఆ ςϯϙϥϦϑΝΠϧΛ࡞ ੒ɻʢ࡞੒ͱಉ࣌ʹ VOMJOLʣ ࢠϓϩηεΛੜ੒ͯ͠ɺ ඪ४ग़ྗɾඪ४Τϥʔग़ ྗΛςϯϙϥϦϑΝΠϧ ʹ޲͚Δ ࣮ߦϑΝΠϧΛ࣮ߦͯ͠ ͋ͱ͸ɺPQFOͨ͠ϓϩη ε͕ɺςϯϙϥϦϑΝΠ ϧͷGEܦ༝ͰSFBE ʢCJOEFY@SFBEʣ

ศརͦ͏Ͱ͢ͶΑʂʁ

GVTFCJOEFYͰ ϨΨγʔγεςϜΛ ͳΊΒ͔ʹͯ͠ߦ͖·͠ΐ͏ʂ

ͱɺ͍͍͍ͨͱ͜ΖͰ͕͢ɺ

GVTFCJOEFYͷμϝμϝͳͱ͜Ζ wJOPUJGZʹରԠ͍ͯ͠ͳ͍ͨΊɺ  ʮมߋΛݕ஌ͯ͠ϛυϧ΢ΣΞΛSFMPBEʯͷΑ͏ͳ͜ͱ͕  ɹͰ͖ͳ͍ wʮผʹDPOTVMUFNQMBUFͰΑ͘ͳ͍ʁʯʮ࠷ѱDSPOͰ΋͍͍͠ʯ  ɹˠͦͷͱ͓Γ

͜ͷͨΊɺ࢖͍ಓ໛ࡧத

͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ

ホスティングにおける fuse の利用

ホスティングにおける fuse の利用

harasou

More Decks by harasou

Featured

Transcript

ϨΨγʔγεςϜΛࢧ͑Δٕज़ ݪޱफޛ(.01FQBCP *OD )PTUJOH$BTVBM5BMLT ϗεςΟϯάʹ͓͚ΔGVTFͷར༻

໨࣍ wϩϦϙοϓʂͷ঺հ wγεςϜߏ੒ͷఀ଺ wGVTFCJOEFYͷ঺հ

ΠϯϑϥΤϯδχΞ ݪޱफޛ!IBSBTPV ϗεςΟϯάࣄۀ෦ϗεςΟϯάάϧʔϓ  ΠϯϑϥνʔϜ೥໨ʢ࠽ʣ IUUQTIBSBTPVKQ

ϩϦϙοϓʂͷ͝঺հ

͜ͷߏ੒ɺ ೥ؒ΄ͱΜͲมΘ͍ͬͯͳ͍ʜ

มԽ͸େࣄ

ͳΊΒ͔ͳγεςϜ

ͳΊΒ͔ͳγεςϜͱ͸ ग़యɿIUUQTTQFBLFSEFDLDPNNBUTVNPUP@SOVNCFSIPTDPOOBNFSBLBE

ʮαʔόͷഁյͱ࠶ߏஙʯ

ͳΊγεͷҰา αʔό্ʹ͔͠ͳ͍σʔλͱ͔ ͋ͬͨΒɺ·͍ͣΑͶʁ

ͳΊγεͷҰา w·ͣ͸ʮ"QBDIFͷWIPTUΛ%#Խʯ͠Α͏ w࢒೦ͳ͕Βɺݱঢ়ͷNPE@NSVCZͰ͸ແཧ w͍Ζ͍Ζ͋ΔNPE@WIPTUYYYͱ࢖͑͹ɺ͍͚ͦ͏Ͱ͸͋Δ wͰ΋ɺ΄ͱΜͲϝϯς͞Εͯͳ͍͠ɺ͓΋͠ΖΈ͕ͳ͍

Ͱɺ࡞Γ·ͨ͠ɻ GVTFCJOEFY

GVTFCJOEFYͷએ఻

GVTFCJOEFYͷಛ௃ wϢʔβۭؒͰϑΝΠϧγεςϜΛ࣮૷ՄೳͳMJCGVTFΛ͔ͭͬͯɺಠࣗ ͷϑΝΠϧγεςϜΛ࡞੒ w࣮ߦϑΝΠϧΛɺಠࣗϑΝΠϧγεςϜʢGVTFCJOEFYEʣܦ༝Ͱ PQFOSFBEʢྫ͑͹DBUʣ͢Δͱɺର৅ͷϑΝΠϧΛFYFDWFͨ͠ ݁Ռ͕ฦΔ # cat /var/lib/bindex/now Thu

GVTFCJOEFY४උ # ls -l /opt/bindex/ /var/lib/bindex/ /opt/bindex/: total 4 -rw-r--r--

GVTFCJOEFY࣮ߦྫ # cat /opt/bindex/now #!/bin/bash date # # cat /var/lib/bindex/now

GVTFCJOEFY૝ఆར༻γʔϯ ϛυϧ΢ΣΞʹҙࣝͤ͞ͳ͍ܗͰɺઃఆϑΝΠϧͳͲΛಈతͳ෺ʹ  มߋͰ͖Δɻ wBQBDIFͷઃఆϑΝΠϧ wIPTUT w44-ূ໌ॻ wSTZOEDPOG wFUD

GVTFCJOEFY࣮૷ PQFOTZTUFNDBMM int bindex_open(const char path, struct fuse_file_info fi) {

ศརͦ͏Ͱ͢ͶΑʂʁ

GVTFCJOEFYͰ ϨΨγʔγεςϜΛ ͳΊΒ͔ʹͯ͠ߦ͖·͠ΐ͏ʂ

ͱɺ͍͍͍ͨͱ͜ΖͰ͕͢ɺ

GVTFCJOEFYͷμϝμϝͳͱ͜Ζ wJOPUJGZʹରԠ͍ͯ͠ͳ͍ͨΊɺ  ʮมߋΛݕ஌ͯ͠ϛυϧ΢ΣΞΛSFMPBEʯͷΑ͏ͳ͜ͱ͕  ɹͰ͖ͳ͍ wʮผʹDPOTVMUFNQMBUFͰΑ͘ͳ͍ʁʯʮ࠷ѱDSPOͰ΋͍͍͠ʯ  ɹˠͦͷͱ͓Γ

͜ͷͨΊɺ࢖͍ಓ໛ࡧத

Ҏ্

͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ