๋จธ๋ฆฌ์ ์ข ์ด๋ดํฌ๋ฅผ ์ด๊ณ ์๋ ๋จ์
์ค๋ Catalina๋ฅผ 15.6์์ 15.7๋ก ์ ๋ฐ์ดํธํ ํ ์ธํฐ๋ท ์๋๊ฐ ๋จ์ด์ง๊ณ ๋ญ๊ฐ ๋คํธ์ํฌ์ ๊ณผ๋ถํ๊ฐ ๊ฑธ๋ ค์ ๋คํธ์ํฌ ํ๋์ ์ดํด๋ณด๊ธฐ๋ก ๊ฒฐ์ ํ์ต๋๋ค.
๋๋ ๋ช ์๊ฐ ๋์ tcpdump๋ฅผ ์คํํ์ต๋๋ค.
sudo tcpdump -k NP > ~/log
๊ทธ๋ฆฌ๊ณ ๊ฐ์ฅ ๋จผ์ ๋ด ๋๊ธธ์ ์ฌ๋ก์ก์ ๊ฒ์:
16:43:42.919443 () ARP, Request who-has 192.168.1.51 tell 192.168.1.1, length 28
16:43:42.927716 () ARP, Request who-has 192.168.1.52 tell 192.168.1.1, length 28
16:43:42.934112 () ARP, Request who-has 192.168.1.53 tell 192.168.1.1, length 28
16:43:42.942328 () ARP, Request who-has 192.168.1.54 tell 192.168.1.1, length 28
16:43:43.021971 () ARP, Request who-has 192.168.1.55 tell 192.168.1.1, length 28
์ ๋ด ์ ์ฒด ๋ก์ปฌ ๋คํธ์ํฌ๊ฐ ํ์ํ๊ฐ์? 192.168.1./255 XNUMX๋ถ๋ง๋ค ๋์์ด ์ค์บํฉ๋๋ค. ์ข์ต๋๋ค. ์ด๊ฒ์ด ๋คํธ์ํฌ ๋ธ๋ผ์ฐ์ ์๋น์ค๋ผ๊ณ ๊ฐ์ ํด ๋ณด๊ฒ ์ต๋๋ค.
(shadowserver.org) โ ๋น์๋ฆฌ ๋ณด์ ๋จ์ฒด
16:43:33.518282 () IP scan-05l.shadowserver.org.33567 > 192.168.1.150.rsync: Flags [S], seq 1527048226, win 65535, options [mss 536], length 0
๋ ๋ค๋ฅธ ๋ฌธ๊ณ ๋ฆฌ(scanner-12.ch1.censys-scanner.com -> censys.io):
16:44:16.254073 () IP scanner-12.ch1.censys-scanner.com.62651 > 192.168.1.150.8843: Flags [S], seq 1454862354, win 1024, options [mss 1460], length 0
์ข์์, ์ข์์, ํน๋ณํ ๊ฒ์ ์๋ ๊ฒ ๊ฐ์ต๋๋ค. ๋ถ์, ๋ก์ปฌ ๋คํธ์ํฌ ๊ฒ์ ๋ฑ์ ์ผ๋ฐ์ ์ธ ์ผ์ด์ง๋ง ๋ค์์ ์ด๋ป์ต๋๊น?
16:15:56.603292 () IP 45.129.33.152.51777 > 192.168.1.150.jpegmpeg: Flags [S], seq 2349838714, win 1024, options [mss 536], length 0
์ด IP ์ฃผ์๋ก ์ด๋ํ๋ฉด
ํ ์คํธ ํ์ผ์๋ ํฌํธ๊ฐ ์๋ ์๋ฐฑ๋ง ๊ฐ์ IP ์ฃผ์๊ฐ ํฌํจ๋์ด ์์ต๋๋ค.
์์ ํ์ผ์ ๋ด์ฉ:
[?1h=[?25l[H[J[mtop - 21:17:26 up 31 days, 6:44, 1 use[m[39;49m[m[39;49m[K
Tasks:[m[39;49m[1m 144 [m[39;49mtotal,[m[39;49m[1m 1 [m[39;49mrunning,[m[39;49m[1m 143 [m[39;49msleep[m[39;49m[m[39;49m[K
%Cpu(s):[m[39;49m[1m 0.8 [m[39;49mus,[m[39;49m[1m 0.0 [m[39;49msy,[m[39;49m[1m 0.0 [m[39;49mni,[m[39;49m[1m 92.0[m[39;49m[m[39;49m[K
KiB Mem :[m[39;49m[1m 32681700 [m[39;49mtotal,[m[39;49m[1m 18410244 [m[39;49mfree,[m[39;49m[m[39;49m[K
KiB Swap:[m[39;49m[1m 16449532 [m[39;49mtotal,[m[39;49m[1m 16449288 [m[39;49mfree,[m[39;49m[m[39;49m[K
[K
[7m PID USER PR NI VIRT RES [m[39;49m[K
[m 1 root 20 0 191072 3924 [m[39;49m[K
[m 2 root 20 0 0 0 [m[39;49m[K
[m 3 root 20 0 0 0 [m[39;49m[K
[m 5 root 0 -20 0 0 [m[39;49m[K
[m 7 root rt 0 0 0 [m[39;49m[K
[m 8 root 20 0 0 0 [m[39;49m[K
[m 9 root 20 0 0 0 [m[39;49m[K
[m 10 root rt 0 0 0 [m[39;49m[K
[m 11 root rt 0 0 0 [m[39;49m[K
[m 12 root rt 0 0 0 [m[39;49m[K
[m 13 root 20 0 0 0 [m[39;49m[K
[m 15 root 0 -20 0 0 [m[39;49m[K
[m 16 root rt 0 0 0 [m[39;49m[K[H[mtop - 21:17:29 up 31 days, 6:44, 1 use[m[39;49m[m[39;49m[K
%Cpu(s):[m[39;49m[1m 0.0 [m[39;49mus,[m[39;49m[1m 0.0 [m[39;49msy,[m[39;49m[1m 0.0 [m[39;49mni,[m[39;49m[1m100.0[m[39;49m[m[39;49m[K
KiB Mem :[m[39;49m[1m 32681700 [m[39;49mtotal,[m[39;49m[1m 18409876 [m[39;49mfree,[m[39;49m[m[39;49m[K
[K
๊ทธ๋ฆฌ๊ณ ๋ง์ง๋ง์ผ๋ก, ์๋ ค์ง์ง ์์ ์ฌ๋ฌ ์ฟผ๋ฆฌ๊ฐ ์์ต๋๋ค.
16:16:07.022910 () IP 059148253194.ctinets.com.58703 > 192.168.1.150.4244: Flags [S], seq 2829545743, win 1024, options [mss 536], length 0
16:15:57.133836 () IP 45.129.33.2.55914 > 192.168.1.150.39686: Flags [S], seq 700814637, win 1024, options [mss 536], length 0
16:15:56.603292 () IP 45.129.33.152.51777 > 192.168.1.150.jpegmpeg: Flags [S], seq 2349838714, win 1024, options [mss 536], length 0
16:16:15.083755 () IP 45.129.33.154.55846 > 192.168.1.150.7063: Flags [S], seq 4079154719, win 1024, options [mss 536], length 0
16:15:43.251305 () IP 192.168.1.150.60314 > one.one.one.one.domain: 3798+ PTR? 237.171.154.149.in-addr.arpa. (46)
16:16:24.386628 () IP 45.141.84.30.50763 > 192.168.1.150.12158: Flags [S], seq 572523718, win 1024, options [mss 536], length 0
16:16:44.817035 () IP 92.63.197.66.58219 > 192.168.1.150.15077: Flags [S], seq 4012437618, win 1024, options [mss 536], length 0
16:15:43.172042 () IP 45.129.33.46.51641 > 192.168.1.150.bnetgame: Flags [S], seq 362771723, win 1024, options [mss 536], length 0
16:17:02.120063 () IP 45.129.33.23.42275 > 192.168.1.150.11556: Flags [S], seq 3354007029, win 1024, options [mss 536], length 0
16:16:00.589816 () IP 45.129.33.3.56005 > 192.168.1.150.40688: Flags [S], seq 2710391040, win 1024, options [mss 536], length 0
ํธ์คํธ ํ์ผ์์ ์ด๋ฌํ ๋๋ฉ์ธ๊ณผ IP ์ฃผ์๋ฅผ ์ฐจ๋จํ๋ฉด ๋ค์ ๋คํ์๋ ๋์ผํ IP ์๋ธ๋ท์ด ์์ง๋ง ์ต์ข ์ฃผ์๋ ๋ค๋ฅด๋ฉฐ ๋๋ฉ์ธ์ ํ์ ๋๋ฉ์ธ์ด ๋ณ๊ฒฝ๋ฉ๋๋ค.
Mac์ด ํธ์คํธ ํ์ผ *.example.com์ ๋ง์คํฌ๋ฅผ ์ธ์ํ์ง ๋ชปํฉ๋๋ค.
์ ์ก๋๋ ํจํท์ ์ด๋ป๊ฒ ๋ณด๋์ง, ์ด๋ค ํ๋ก์ธ์ค๋ ๋ฐ๋ชฌ์ด ์ด๋ฌํ ์ฐ๊ฒฐ์ ์ ๋ฐํ๋์ง ํ์ ํ์ง ๋ชปํ์ง๋ง(์ ๋ ๋ฉฐ์น ๋์ Mac์ ์ฌ์ฉํ์ต๋๋ค) ๋ฒ์จ ์ฌ๋ฏธ์์ต๋๋ค!
์ถ์ฒ : habr.com