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Fixed the bug that prevented communication with FTP servers behind

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NAT in extended passive mode if the server's public IP address was
different from the main NAT address.  This caused a wrong aliasing
link to be created that did not route the incoming packets back to
the original IP address of the server.

	natd -v -n pub0 -redirect_address localFTP publicFTP

Note that even if localFTP == publicFTP, one still needs to supply
the -redirect_address directive.  It is needed as a helper because
extended passive mode's 229 reply does not contain the IP address.

MFC after:	1 week
This commit is contained in:
Ruslan Ermilov 2001-09-21 14:38:36 +00:00
parent e284cfe41e
commit c1dd00f75c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=83771
2 changed files with 8 additions and 6 deletions
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7
lib/libalias/alias_ftp.c
View File

@ -145,8 +145,10 @@ int maxpacketsize /* The maximum size this packet can grow to (including header
*/
if (ParseFtp227Reply(sptr, dlen))
ftp_message_type = FTP_227_REPLY;
else if (ParseFtp229Reply(sptr, dlen))
else if (ParseFtp229Reply(sptr, dlen)) {
ftp_message_type = FTP_229_REPLY;
true_addr.s_addr = pip->ip_src.s_addr;
}
}
if (ftp_message_type != FTP_UNKNOWN_MESSAGE)
@ -464,8 +466,7 @@ NewFtpMessage(struct ip *pip,
struct alias_link *ftp_link;
/* Security checks. */
if (ftp_message_type != FTP_229_REPLY &&
pip->ip_src.s_addr != true_addr.s_addr)
if (pip->ip_src.s_addr != true_addr.s_addr)
return;
if (true_port < IPPORT_RESERVED)

7
sys/netinet/libalias/alias_ftp.c
View File

@ -145,8 +145,10 @@ int maxpacketsize /* The maximum size this packet can grow to (including header
*/
if (ParseFtp227Reply(sptr, dlen))
ftp_message_type = FTP_227_REPLY;
else if (ParseFtp229Reply(sptr, dlen))
else if (ParseFtp229Reply(sptr, dlen)) {
ftp_message_type = FTP_229_REPLY;
true_addr.s_addr = pip->ip_src.s_addr;
}
}
if (ftp_message_type != FTP_UNKNOWN_MESSAGE)
@ -464,8 +466,7 @@ NewFtpMessage(struct ip *pip,
struct alias_link *ftp_link;
/* Security checks. */
if (ftp_message_type != FTP_229_REPLY &&
pip->ip_src.s_addr != true_addr.s_addr)
if (pip->ip_src.s_addr != true_addr.s_addr)
return;
if (true_port < IPPORT_RESERVED)