按照標準的rfc協議，你可以捕捉一下代碼：

COMMAND-REPLY CORRESPONDENCE TABLE

COMMAND SUCCESS FAIL

------- ------- ----

USER 230,330 430-432,500-505,507

PASS 230,331 430-432,500-507

ACCT 230 430-432,500-507

REIN 232,233 401,436,500-507

Secondary Reply 300

BYE 231,232 430-432,500-505,507

BYTE 200,331 500-507

SOCK 200,331 500-505,507

LSTN 255,331 500-507

TYPE 200,331 500-507

FORM 200,331 500-507

STRU 200,331 500-507

MODE 200,331 500-507

RETR 250,331 433,450,451,454,455,500-505,507,550

Secondary Reply 252 452

STOR 250,331 433,451,454,455,457,500-505,507,550

Secondary Reply 252 452,453

APPE 250,331 433,451,454,455,457,500-507,550

Secondary Reply 252 452,453

ALLO 200,331 500-507

REST 200,331 500-507

RNFR 200,331 433,450,451,455,500-507,550

RNTO 253,331 433,450,451,455,456,500-505,507,550

ABOR 201,202,331 500-507

>>>DELE 254,331 433,450,451,455,500-507,550

嗬嗬，就是這幾個鳥。

LIST 250,331 433,450,451,454,455,457,500-507,550

Secondary Reply 252 452

NLST 250,331 433,450,451,454,455,457,500-507

Secondary Reply 252 452

STAT 100,110,150, 450,451,454,455,500-507,550

151,331

HELP 000,030,050, 500-507

331

MLFL 250,331 433,450,451,454,455,457,500-507

Secondary Reply 252 452,453

MAIL 331,350 433,450,451,455,500-507

Secondary Reply 256

NOOP 200 500-505,507

QUOT 200,331 500-507

NQUO 200 500-505,507

Spontaneous 0xx,300,301 400,401,434-436

Replies 251,255

總結

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