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Michal Marek provided a patch for FTP that makes libcurl continue to try PASV

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even after EPSV returned a positive response code, if libcurl failed to
connect to the port number the EPSV response said. Obviously some people are
going through protocol-sensitive firewalls (or similar) that don't understand
EPSV and then they don't allow the second connection unless PASV was
used. This also called for a minor fix of test case 238.
This commit is contained in:
Daniel Stenberg 2006-01-24 14:40:43 +00:00
parent 803582f8ac
commit 67bf4f28ff
4 changed files with 31 additions and 4 deletions
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8
CHANGES
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@ -6,6 +6,14 @@
Changelog
Daniel (24 January 2006)
- Michal Marek provided a patch for FTP that makes libcurl continue to try
PASV even after EPSV returned a positive response code, if libcurl failed to
connect to the port number the EPSV response said. Obviously some people are
going through protocol-sensitive firewalls (or similar) that don't
understand EPSV and then they don't allow the second connection unless PASV
was used. This also called for a minor fix of test case 238.
Daniel (20 January 2006)
- Duane Cathey was one of our friends who reported that curl -P [IP]
(CURLOPT_FTPPORT) didn't work for ipv6-enabed curls if the IP wasn't a

3
RELEASE-NOTES
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@ -18,6 +18,7 @@ This release includes the following changes:
This release includes the following bugfixes:
o Try PASV after failing to connect to the port the EPSV response contained
o -P [IP] with ipv6-enabled curl
o -P [hostname] with ipv6-disabled curl
o libcurl.m4 was updated
@ -45,6 +46,6 @@ advice from friends like these:
Dov Murik, Jean Jacques Drouin, Andres Garcia, Yang Tse, Gisle Vanem, Dan
Fandrich, Alexander Lazic, Michael Jahn, Andrew Benham, Bryan Henderson,
David Shaw, Jon Turner, Duane Cathey
David Shaw, Jon Turner, Duane Cathey, Michal Marek
Thanks! (and sorry if I forgot to mention someone)

12
lib/ftp.c
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@ -1661,6 +1661,18 @@ static CURLcode ftp_state_pasv_resp(struct connectdata *conn,
Curl_resolv_unlock(data, addr); /* we're done using this address */
if (result && ftp->count1 == 0 && ftpcode == 229) {
infof(data, "got positive EPSV response, but can't connect. "
"Disabling EPSV\n");
/* disable it for next transfer */
conn->bits.ftp_use_epsv = FALSE;
data->state.errorbuf = FALSE; /* allow error message to get rewritten */
NBFTPSENDF(conn, "PASV", NULL);
ftp->count1++;
/* remain in the FTP_PASV state */
return result;
}
if(result)
return result;

12
tests/data/test238
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@ -8,26 +8,32 @@
ftp
</server>
<name>
FTP getting bad port in 229-response to EPSV
FTP getting bad port in response to EPSV and in response to PASV
</name>
<command>
ftp://%HOSTIP:%FTPPORT/238
</command>
<file name="log/ftpserver.cmd">
REPLY EPSV 229 Entering Passiv Mode (|||1000000|)
REPLY PASV 227 Entering Passiv Mode (1216,256,2,127,127,127)
</file>
</client>
# Verify data after the test has been "shot"
<verify>
# 7 => CURLE_COULDNT_CONNECT
# curl: (15) Can't resolve new host 1216.256.2.127:32639
# 15 => CURLE_FTP_CANT_GET_HOST
# some systems just don't fail on the illegal host name/address but instead
# moves on and attempt to connect to... yes, to what?
# 7= CURLE_COULDNT_CONNECT
<errorcode>
7
7, 15
</errorcode>
<protocol>
USER anonymous
PASS curl_by_daniel@haxx.se
PWD
EPSV
PASV
</protocol>
</verify>