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FTP: allow PASV on IPv6 connections when a proxy is being used

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In the situation of a client connecting to an FTP server using an IPv6
tunnel proxy, the connection info will indicate that the connection is
IPv6. However, because the server behing the proxy is IPv4, it is
permissable to attempt PSV mode. In the case of the FTP server being
IPv4 only, EPSV will always fail, and with the current logic curl will
be unable to connect to the server, as the IPv6 fwdproxy causes curl to
think that EPSV is impossible.

Closes #2432
This commit is contained in:
Laurie Clark-Michalek 2018-03-28 15:42:33 +01:00 committed by Daniel Stenberg
parent 695e96b3d5
commit 5f3938bc4a
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1 changed files with 1 additions and 1 deletions
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lib/ftp.c
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@ -1788,7 +1788,7 @@ static CURLcode ftp_epsv_disable(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
if(conn->bits.ipv6) {
if(conn->bits.ipv6 && !(conn->bits.tunnel_proxy || conn->bits.socksproxy)) {
/* We can't disable EPSV when doing IPv6, so this is instead a fail */
failf(conn->data, "Failed EPSV attempt, exiting\n");
return CURLE_WEIRD_SERVER_REPLY;