enginnerday.pdf

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1. ErlangͰιϑτ΢ΣΞ ϧʔλΛ࡞ͬͯΔ࿩ FUKUOKA Enginners Day 2018 ~Autumn~ 2018/9/22ʢ౔ʣ খݪɹਸ׮
2. ࣗݾ঺հ • ໊લɿখݪɹਸ׮ • ॴଐɿגࣜձࣾFusic • ڵຯ͝ͱɿωοτϫʔΫɺ
 ErlangɺElixir • Twitterɿ@kobatako_
3. ࿩͢͜ͱ • ErlangͰͷ࣮૷ʹ͍ͭͯ • ࣮૷ͨ͠಺༰ • ·ͱΊ
4. ErlangͰͷ࣮૷ʹ͍ͭͯ
5. Erlangͱ͸ • ؔ਺ܕݴޠ • ߴ͍Մ༻ੑͱεέʔϥϏϦςΟΛ࣋ͭ • ి࿩ަ׵ػͰ࢖ΘΕͯͨ • ฒྻॲཧʹ޲͍ͯΔ
6. ͳͥErlangͰ࣮૷ͨ͠ͷ͔
7. bitstring
8. bitstring • όΠτྻʹରͯ͠Ϗοτ୯ҐͰΞΫηεɺૢ ࡞͢Δ͜ͱ͕Ͱ͖Δ % bitstring <<69,16,0,60,227,255,64,0,63,6,255,108,172,31,0,2,172,17,0,13,198,22,31,64, 73,33,85,221,0,0,0,0,160,2,114,16,88,110,0,0,2,4,5,180,4,2,8,10,8,17,182,34 ,0,0,0,0,1,3,3,7>> % Ϗοτ୯ҐͰม਺ʹଋറ͢Δ <<DestMacAddr:48, SourceMacAddr:48, Type:16, Data/bitstring>> = Buf, % Ϗοτ୯ҐͰ֤ม਺ΛbitstringͷҰ෦ͱͯ͠ม਺ʹଋറ͢Δ SendData = <<Ver:4, Len:4, ServiceType, Packetlen:16, IdentificationNumber: 16, Flg:3, Offset:13, CountTTL, Protocol, SourceIp:32, DestIp:32>>,
9. ύλʔϯϚον
10. ύλʔϯϚον • ӈลΛධՁ͠ɺࠨลͱҰக͍ͯ͠Δ͔Λௐ΂Δ 1> N = 9. % NΛ9Ͱଋറ 9 2> N. 9 3> N = 0. % ӈลͱࠨล͕౳͘͠ແ͍ͨΊΤϥʔ ** exception error: no match of right hand side value 0 4> 9 = N. % ӈลͱࠨล͕౳͍ͨ͠Ίਖ਼ৗ 9 5> {N, M} = {9, 0}. % ӈลͷ9ͱࠨลͷN͕౳͍ͨ͠ΊMʹ0Λଋറͤ͞Δ {9,0} 6> {N, L} = {0, 8}. % ӈลͷ9ͱࠨลͷN͕౳͘͠ແ͍ͨΊΤϥʔ ** exception error: no match of right hand side value {0,8}
11. ύλʔϯϚον • ؔ਺ͷҾ਺ͱͯ͠΋ѻ͑Δ • ઌ಄͔ΒॱʹධՁ͍͖ͯ͠ɺҰ൪࠷ॳʹϚονͨؔ͠਺Λ࣮ߦ͢Δ handle_event(Buf, Fd) -> <<_:48, SourceMacAddr:48, Type:16, Data/bitstring>> = Buf, ɾɾɾ ethernet_type(Type, Data); ɾɾɾ % IP Protocol ethernet_type(16#0800, Data) -> % Type͕16ਐ਺Ͱ0800ͷ৔߹ʹݺ͹ΕΔؔ਺ ip:packet(Data); % ARP Protocol ethernet_type(16#0806, Data) -> % Type͕16ਐ਺Ͱ0806ͷ৔߹ʹݺ͹ΕΔؔ਺ arp:packet(Data); ethernet_type(_Type, _Data) -> % _͸શͯʹϚον͢Δม਺ʹͳΔͷͰɺશͯʹϚον͢Δ false;
12. ύλʔϯϚον • bitstringΛҾ਺ͱͯ͠౉͠ɺύλʔϯϚονͰ࣮ߦ͢ Δؔ਺Λม͑Δ % IP check sump % ୈҰҾ਺͕͔ΒͷbitstringʹͳͬͨΒ஋Λฦ͢ checksum(<<>>, Sum) -> Sum bxor 16#FFFF; % ୈҰҾ਺͕16bitҎ্͋Δͱ͖ checksum(<<A:16, Other/bitstring>>, Sum) -> Check = A + Sum, Res = (Check band 16#FFFF) + (Check bsr 16), checksum(Other, Res).
13. ·ͩ·ͩڧྗͳػೳ͕͍ͬͺ ͍͋Γ·͢!!! http://erlang.org/doc/reference_manual/ introduction.html
14. ࣮૷ͨ͠಺༰
15. ࣮૷ͨ͠಺༰ • ARP ςʔϒϧ • ϧʔςΟϯάςʔϒϧ • ϧʔςΟϯά
16. ARP ςʔϒϧ
17. ARP ςʔϒϧ • ARPͷϦΫΤετͱϦϓϥΠͷ৘ใΛอଘ͠ ͓ͯ͘ • ૹΓઌͷIPΞυϨεͱMacΞυϨεΛඥ͚ͮ Δ
18. ARP ςʔϒϧͷ৘ใ % source_ip_addrɿࣗ෼ͷΠϯλʔϑΣΠεͷIPΞυϨε % dest_ip_addrɿ૬खઌͷIPΞυϨε % dest_mac_addrɿ૬खઌͷMacΞυϨε % typeɿΠϯλʔϑΣΠεͷλΠϓ -record(arp_table, { source_ip_addr, dest_ip_addr, dest_mac_addr, type }).
19. ϧʔςΟϯάςʔϒϧ
20. ϧʔςΟϯάςʔϒϧ • ύέοτͷૹ৴ઌͱͳΔܦ࿏৘ใ • ૹ৴͢Δࡍͷ༏ઌ౓΍Ͳ͏͍ͬͨํ๏Ͱܦ࿏ ৘ใΛऔಘ͔ͨ͠ͳͲ͕ه࿥͞Ε͍ͯΔ
21. % source_routeɿͲ͔͜Βܦ࿏৘ใΛऔಘ͔ͨ͠ % dest_routeɿͲ͜ʹૹΔࡍͷܦ࿏৘ใͳͷ͔ʢྫɿ{192.168.100.0}ʣ % dest_route_intɿdest_routeΛ਺ྻʹͨ͠΋ͷɻϩϯήετϚονͰ࢖͏ % subnetmaskɿdest_routeͷαϒωοτϚεΫʢྫɿ{255, 255, 255, 0}ʣ % subnetmask_intɿsubnetmaskΛ਺ྻʹͨ͠΋ͷɻϩϯήετϚονʹ࢖͏ -record(routing_table, { source_route, dest_route, dest_route_int, subnetmask, subnetmask_int, ad, metric, nexthop, age, out_interface }). ϧʔςΟϯάςʔϒϧͷ৘ใ
22. % adɿΞυϛχετϨʔςΟϒσΟελϯε஋ % metricɿܦ࿏৘ใͷϝτϦοΫ஋ % nexthopɿdest_routeʹૹΔͨΊ࣍ʹૹ৴͢ΔϧʔλͷIPΞυϨε % ageɿܦ࿏৘ใΛऔಘ͔ͯ͠ΒͲΕ͙Β͍ܦա͔ͨ͠ % out_interfaceɿͲͷΠϯλʔϑΣΠεͷܦ࿏৘ใͳͷ͔
    -record(routing_table, { source_route, dest_route, dest_route_int, subnetmask, subnetmask_int, ad, metric, nexthop, age, out_interface }). ϧʔςΟϯάςʔϒϧͷ৘ใ
23. ϧʔςΟϯάςʔϒϧͷAD஋ σϑΥϧτͷ"%஋ ઀ଓ͞Ε͍ͯΔΠϯλʔϑΣΠε  ελςΟοΫϧʔςΟϯά  αϚϦʔϧʔτ  ֎෦#(1  ಺෦&*(31  *(31  041'  *4*4  3*1  &(1  003  ֎෦&*(31  ಺෦#(1  ෆ໌  Ciscoαϙʔτର৅ϓϩτίϧͷAD஋
24. ϧʔςΟϯά
25. ϧʔςΟϯά • ϧʔςΟϯάςʔϒϧΛجʹૹ৴ઌʹ޲͚ͯ Ͳͷܦ࿏ͰૹΔ͔Λܾఆ͢Δ • ෳ਺ͷܦ࿏͕͋Δ৔߹͸࠷దͳܦ࿏͔ΒૹΔ Α͏ʹ͢Δ A B C D E
26. ϧʔςΟϯάͷܦ࿏બ୒ • ܦ࿏બ୒ͷ༏ઌ౓ • ϩϯήετϚον • AD஋ • ϝτϦοΫ
27. ϧʔςΟϯάͷܦ࿏બ୒ • ϩϯήετϚον • ૹ৴ઌͱͳΔIPͱdest_route͕Ұ൪౳͘͠ ͳ͍ͬͯΔ΋ͷΛ༏ઌ͢Δ ૹ৴ઌɿ
    ܦ࿏৘ใᶃɿEFTU@SPVUF
    
    TVCOFUNBTL
    
    
    
    ·Ͱ͸౳͍͠ܦ࿏৘ใ
    ܦ࿏৘ใᶄɿEFTU@SPVUF
    
    TVCOFUNBTL
    
    
    ·Ͱ͕౳͍͠ܦ࿏৘ใ
    ᶄ͕༏ઌ͞ΕΔ
28. ϧʔςΟϯάͷܦ࿏બ୒ • AD஋ • ܦ࿏৘ใͷऔಘํ๏͝ͱ • ϝτϦοΫ • औಘํ๏͝ͱͷ༏ઌ౓ʢRIPͰ͸ϗοϓ਺ɺ OSPFͰ͸ίετʣ
29. ϧʔςΟϯάͷྲྀΕ 1. ૹ৴ઌͷnexthopΛϧʔςΟϯάςʔϒϧ͔Βऔಘ 2. nexthopͷMacΞυϨεΛARPςʔϒϧʹཁٻ 3. ʢARPςʔϒϧʹແ͍৔߹ʣARPϦΫΤετΛૹΓɺARPςʔϒϧΛߋ৽͢Δ 4. ʢIPϓϩτίϧͷ৔߹ʣTTLΛҰͭݮΒ͠ɺνΣοΫαϜΛ࠶ܭࢉ 5. ARPςʔϒϧ͔Βऔಘͨ͠MacΞυϨεΛ࣍ͷૹ৴ઌMacΞυϨεͱͯ͠Ѽઌ MacΞυϨεʹೖΕΔ 6. ૹ৴ݩͷMacΞυϨεΛࣗ਎ͷΠϯλʔϑΣΠεͷMacΞυϨεʹஔ͖׵͑Δ 7. ૹ৴
30. ͜͜·Ͱ࣮૷͢Ε͹ͻͱ·ͣ ping͕௨Δ
31. ݱࡏͷ՝୊
32. ݱࡏͷ՝୊ • L3·Ͱͷύέοτ͸ૹ৴Ͱ͖Δ͕L4Ҏ্ʹͳ ΔͱϨεϙϯε͕ฦͬͯ͜ͳ͘ͳΔ • ελςΟοΫϧʔςΟϯάͷ࣮૷ • μΠφϛοΫϧʔςΟϯάͷ࣮૷ • ICMPͷ࣮૷
33. ΍Βͳͱ͍͚ͳ͍͜ͱ͕·ͩ ·ͩ͋Δ
34. ࠓޙ࣮૷͍ͨ͠΋ͷ
35. ࠓޙ࣮૷͍ͨ͠΋ͷ • ύΠϓϥΠϯॲཧ • Firewall • Load Balancer • ΧΦεϞϯΩʔ
36. ·ͱΊ
37. ·ͱΊ • ࣮ߦ଎౓͕·ͩ·ͩ஗͍ͷͰվળ͍͖͍ͯͨ͠ ʢpingͰ1msҎ্͔͔Δʣ • ωοτϫʔΫͷ஌͕ࣝਂ·ͬͯΔʢؾ͕͢Δʣ • ύέοτ͕ʢงғؾʣಡΊΔΑ͏ʹͳ͖ͬͯͨ • ໨grepྗ͕ߴ·Δʢ໨͕ർΕΔʣ
38. ·ͱΊ • όάͬͯΔ࣌͸͜ΜͳͷͱʹΒΊͬ͜Ͱ͢                           
    
    
                
    
    
                        
    
    
    
    
    
    
    
    
    
    
    
    
    
    
                         
    
    
    
    
    
    
    
    
    
    
    
    
    
    
                    
                          
    
    
                    
    
    
                          
    
    
    
    
    
    
    
    
    
    
    
    
    
    
                       
    
    
    
    
    
    
    
    
    
    
    
    
    
    
                    
                           
    
    
           
                            
    
    
                            
    
    
          
39. Έͳ͞Μ΋
 ιϑτ΢ΣΞϧʔλ
 ࡞ͬͯΈͯ͸Ͳ͏Ͱ͔͢
40. ͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠