ftp - ピアによる最初のFTP接続（ECONNRESET）

Question

私たちのハードウェアでは、自作のftpサーバーを実行しています。サーバーは、IE、FireFox、Safari、Opera 9、FileZillaなどのブラウザで動作します。しかし、Opera 12を使用すると、2つのftp-dataパッケージの後で接続が閉じられます。サーバーは、errno = 54、別名ECONNRESETを通知します。WireSharkダンプを見ると、OperaがRSTコマンドを送信していることがわかります。私はすでにパッケージサイズを変更しましたが、2つのftp-dataパッケージの後で再び失敗します。なぜこれが起こるのか誰かが知っていますか？

Opera 12の失敗したWireSharkダンプは次のとおりです（パッケージ47はRSTです）。

No.     Time        Source                Destination           Protocol Info
  7 0.010108    172.22.4.229          172.22.6.88           FTP      Response: 331 Password required for user.
  8 0.010198    172.22.6.88           172.22.4.229          FTP      Request: PASS opera@
  9 0.011262    172.22.4.229          172.22.6.88           TCP      ftp > 54729 [ACK] Seq=57 Ack=30 Win=9987 Len=0
 10 0.013992    172.22.4.229          172.22.6.88           FTP      Response: 230 User logged in successfully.
 11 0.014073    172.22.6.88           172.22.4.229          FTP      Request: PWD
 12 0.015197    172.22.4.229          172.22.6.88           TCP      ftp > 54729 [ACK] Seq=91 Ack=35 Win=9995 Len=0
 13 0.016438    172.22.4.229          172.22.6.88           FTP      Response: 257 "/" is current directory.
 14 0.016524    172.22.6.88           172.22.4.229          FTP      Request: EPSV ALL
 15 0.017589    172.22.4.229          172.22.6.88           TCP      ftp > 54729 [ACK] Seq=122 Ack=45 Win=9990 Len=0
 16 0.018933    172.22.4.229          172.22.6.88           FTP      Response: 502 Command not implemented.
 17 0.019015    172.22.6.88           172.22.4.229          FTP      Request: REST 0
 18 0.020078    172.22.4.229          172.22.6.88           TCP      ftp > 54729 [ACK] Seq=152 Ack=53 Win=9992 Len=0
 19 0.021372    172.22.4.229          172.22.6.88           FTP      Response: 502 Command not implemented.
 20 0.021451    172.22.6.88           172.22.4.229          FTP      Request: TYPE I
 21 0.022550    172.22.4.229          172.22.6.88           TCP      ftp > 54729 [ACK] Seq=182 Ack=61 Win=9992 Len=0
 22 0.024777    172.22.4.229          172.22.6.88           FTP      Response: 200 Command TYPE successful.
 23 0.024856    172.22.6.88           172.22.4.229          FTP      Request: SIZE LOG-20120821120000-diagnostic-diag.txt
 24 0.025879    172.22.4.229          172.22.6.88           TCP      ftp > 54729 [ACK] Seq=212 Ack=106 Win=9955 Len=0
 25 0.028300    172.22.4.229          172.22.6.88           FTP      Response: 250 File size: 4626418 bytes (4517 kB)
 26 0.028381    172.22.6.88           172.22.4.229          FTP      Request: MDTM LOG-20120821120000-diagnostic-diag.txt
 27 0.029401    172.22.4.229          172.22.6.88           TCP      ftp > 54729 [ACK] Seq=252 Ack=151 Win=9955 Len=0
 28 0.030845    172.22.4.229          172.22.6.88           FTP      Response: 502 Command not implemented.
 29 0.030923    172.22.6.88           172.22.4.229          FTP      Request: MODE B
 30 0.032096    172.22.4.229          172.22.6.88           TCP      ftp > 54729 [ACK] Seq=282 Ack=159 Win=9992 Len=0
 31 0.033928    172.22.4.229          172.22.6.88           FTP      Response: 502 Command not implemented.
 32 0.034006    172.22.6.88           172.22.4.229          FTP      Request: PASV
 33 0.035098    172.22.4.229          172.22.6.88           TCP      ftp > 54729 [ACK] Seq=312 Ack=165 Win=9994 Len=0
 34 0.040963    172.22.4.229          172.22.6.88           FTP      Response: 227 Entering Passive Mode (172,22,4,229,225,144).
 35 0.041417    172.22.6.88           172.22.4.229          TCP      54730 > 57744 [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=2 SACK_PERM=1
 36 0.041446    172.22.6.88           172.22.4.229          FTP      Request: RETR LOG-20120821120000-diagnostic-diag.txt
 37 0.042691    172.22.4.229          172.22.6.88           TCP      57744 > 54730 [SYN, ACK] Seq=0 Ack=1 Win=10000 Len=0 MSS=1426 SACK_PERM=1 WS=0
 38 0.042716    172.22.6.88           172.22.4.229          TCP      54730 > 57744 [ACK] Seq=1 Ack=1 Win=65596 Len=0
 39 0.043050    172.22.4.229          172.22.6.88           TCP      ftp > 54729 [ACK] Seq=363 Ack=210 Win=9955 Len=0
 40 0.046097    172.22.4.229          172.22.6.88           FTP      Response: 150 Opening data connection.
 41 0.057860    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 1426 bytes
 42 0.058711    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 622 bytes
 43 0.058723    172.22.6.88           172.22.4.229          TCP      54730 > 57744 [ACK] Seq=1 Ack=2049 Win=65596 Len=0
 44 0.063893    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 1426 bytes
 45 0.064826    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 622 bytes
 46 0.064843    172.22.6.88           172.22.4.229          TCP      54730 > 57744 [ACK] Seq=1 Ack=4097 Win=65596 Len=0
 47 0.070829    172.22.6.88           172.22.4.229          TCP      54730 > 57744 [RST, ACK] Seq=1 Ack=4097 Win=0 Len=0
 48 0.070921    172.22.6.88           172.22.4.229          TCP      54729 > ftp [FIN, ACK] Seq=210 Ack=393 Win=65204 Len=0
 49 0.072044    172.22.4.229          172.22.6.88           TCP      ftp > 54729 [ACK] Seq=393 Ack=211 Win=10000 Len=0
 50 0.095833    172.22.4.229          172.22.6.88           FTP      Response: 451 Requested action aborted. Internal errors.
 51 0.095898    172.22.6.88           172.22.4.229          TCP      54729 > ftp [RST, ACK] Seq=211 Ack=441 Win=0 Len=0

Opera9のWORKINGWireSharkダンプは次のとおりです。

No.     Time        Source                Destination           Protocol Info
  1 0.000000    172.22.6.88           172.22.4.229          TCP      54653 > ftp [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=8 SACK_PERM=1
  2 0.001598    172.22.4.229          172.22.6.88           TCP      ftp > 54653 [SYN, ACK] Seq=0 Ack=1 Win=10000 Len=0 MSS=1426 SACK_PERM=1 WS=0
  3 0.001653    172.22.6.88           172.22.4.229          TCP      54653 > ftp [ACK] Seq=1 Ack=1 Win=65536 Len=0
  4 0.007399    172.22.4.229          172.22.6.88           FTP      Response: 220 FTP server ready.
  5 0.022517    172.22.6.88           172.22.4.229          FTP      Request: USER anonymous
  6 0.023565    172.22.4.229          172.22.6.88           TCP      ftp > 54653 [ACK] Seq=24 Ack=17 Win=9984 Len=0
  7 0.024861    172.22.4.229          172.22.6.88           FTP      Response: 331 Password required for user.
  8 0.024950    172.22.6.88           172.22.4.229          FTP      Request: PASS opera@
  9 0.026015    172.22.4.229          172.22.6.88           TCP      ftp > 54653 [ACK] Seq=57 Ack=30 Win=9987 Len=0
 10 0.028033    172.22.4.229          172.22.6.88           FTP      Response: 230 User logged in successfully.
 11 0.028104    172.22.6.88           172.22.4.229          FTP      Request: PWD
 12 0.029223    172.22.4.229          172.22.6.88           TCP      ftp > 54653 [ACK] Seq=91 Ack=35 Win=9995 Len=0
 13 0.031091    172.22.4.229          172.22.6.88           FTP      Response: 257 "/" is current directory.
 14 0.031182    172.22.6.88           172.22.4.229          FTP      Request: TYPE I
 15 0.032228    172.22.4.229          172.22.6.88           TCP      ftp > 54653 [ACK] Seq=122 Ack=43 Win=9992 Len=0
 16 0.033562    172.22.4.229          172.22.6.88           FTP      Response: 200 Command TYPE successful.
 17 0.033635    172.22.6.88           172.22.4.229          FTP      Request: SIZE LOG-20120821120000-diagnostic-diag.txt
 18 0.034655    172.22.4.229          172.22.6.88           TCP      ftp > 54653 [ACK] Seq=152 Ack=88 Win=9955 Len=0
 19 0.037077    172.22.4.229          172.22.6.88           FTP      Response: 250 File size: 4626418 bytes (4517 kB)
 20 0.037154    172.22.6.88           172.22.4.229          FTP      Request: MDTM LOG-20120821120000-diagnostic-diag.txt
 21 0.038224    172.22.4.229          172.22.6.88           TCP      ftp > 54653 [ACK] Seq=192 Ack=133 Win=9955 Len=0
 22 0.040705    172.22.4.229          172.22.6.88           FTP      Response: 502 Command not implemented.
 23 0.040880    172.22.6.88           172.22.4.229          FTP      Request: MODE B
 24 0.041977    172.22.4.229          172.22.6.88           TCP      ftp > 54653 [ACK] Seq=222 Ack=141 Win=9992 Len=0
 25 0.043267    172.22.4.229          172.22.6.88           FTP      Response: 502 Command not implemented.
 26 0.043318    172.22.6.88           172.22.4.229          FTP      Request: PASV
 27 0.044369    172.22.4.229          172.22.6.88           TCP      ftp > 54653 [ACK] Seq=252 Ack=147 Win=9994 Len=0
 28 0.050959    172.22.4.229          172.22.6.88           FTP      Response: 227 Entering Passive Mode (172,22,4,229,225,143).
 29 0.063995    172.22.6.88           172.22.4.229          TCP      54654 > 57743 [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=8 SACK_PERM=1
 30 0.064032    172.22.6.88           172.22.4.229          FTP      Request: RETR LOG-20120821120000-diagnostic-diag.txt
 31 0.065473    172.22.4.229          172.22.6.88           TCP      57743 > 54654 [SYN, ACK] Seq=0 Ack=1 Win=10000 Len=0 MSS=1426 SACK_PERM=1 WS=0
 32 0.065507    172.22.6.88           172.22.4.229          TCP      54654 > 57743 [ACK] Seq=1 Ack=1 Win=65536 Len=0
 33 0.065831    172.22.4.229          172.22.6.88           TCP      ftp > 54653 [ACK] Seq=303 Ack=192 Win=9955 Len=0
 34 0.068242    172.22.4.229          172.22.6.88           FTP      Response: 150 Opening data connection.
 35 0.082611    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 1426 bytes
 36 0.083479    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 622 bytes
 37 0.083494    172.22.6.88           172.22.4.229          TCP      54654 > 57743 [ACK] Seq=1 Ack=2049 Win=65536 Len=0
 38 0.090274    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 1426 bytes
 39 0.091103    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 622 bytes
 40 0.091119    172.22.6.88           172.22.4.229          TCP      54654 > 57743 [ACK] Seq=1 Ack=4097 Win=65536 Len=0
 41 0.114112    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 1426 bytes
 42 0.114900    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 622 bytes
 43 0.114921    172.22.6.88           172.22.4.229          TCP      54654 > 57743 [ACK] Seq=1 Ack=6145 Win=65536 Len=0
 44 0.128935    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 1426 bytes
 45 0.128937    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 622 bytes
 46 0.128961    172.22.6.88           172.22.4.229          TCP      54654 > 57743 [ACK] Seq=1 Ack=8193 Win=65536 Len=0
 47 0.140241    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 1426 bytes
 48 0.141073    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 622 bytes
 49 0.141088    172.22.6.88           172.22.4.229          TCP      54654 > 57743 [ACK] Seq=1 Ack=10241 Win=65536 Len=0
 ......
1046 4.558687    172.22.6.88           172.22.4.229          TCP      54654 > 57743 [ACK] Seq=1 Ack=690177 Win=65536 Len=0
1047 4.570837    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 1426 bytes
1048 4.570878    172.22.6.88           172.22.4.229          TCP      54654 > 57743 [FIN, ACK] Seq=1 Ack=691603 Win=65536 Len=0
1049 4.570928    172.22.6.88           172.22.4.229          TCP      54653 > ftp [FIN, ACK] Seq=192 Ack=333 Win=65024 Len=0
1050 4.571776    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 622 bytes
1051 4.572142    172.22.4.229          172.22.6.88           TCP      57743 > 54654 [ACK] Seq=692225 Ack=2 Win=10000 Len=0
1052 4.572143    172.22.4.229          172.22.6.88           TCP      ftp > 54653 [ACK] Seq=333 Ack=193 Win=10000 Len=0
1053 4.581171    172.22.4.229          172.22.6.88           FTP-DATA FTP Data: 1426 bytes
1054 4.581216    172.22.6.88           172.22.4.229          TCP      54654 > 57743 [RST, ACK] Seq=2 Ack=693651 Win=0 Len=0
1055 4.591403    172.22.4.229          172.22.6.88           FTP      Response: 451 Requested action aborted. Internal errors.
1056 4.591460    172.22.6.88           172.22.4.229          TCP      54653 > ftp [RST, ACK] Seq=193 Ack=381 Win=0 Len=0

score 0 · Accepted Answer

2007年3月のRFC3659によると、サイズ応答の構造は次のとおりです。

size-response = "213" SP 1*DIGIT CRLF /
                error-response

213応答が発行されたとき、つまりエラーがないとき、フォーマットは指定されたとおりでなければならないことに注意してください。複数行の応答は許可されていません。

これは私たちのftpサーバーには当てはまりませんでした。しかし、古いフォーマットは明らかに他のftpクライアントによって受け入れられました。

ftp - ピアによる最初のFTP接続（ECONNRESET）

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