[Bug 1847] New: SFTP doen't work well with IPV6 address

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https://bugzilla.mindrot.org/show_bug.cgi?id=1847

           Summary: SFTP doen't work well with IPV6 address
           Product: Portable OpenSSH
           Version: 5.6p1
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: sftp
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: adamchen at live.cn


Greetings.

I'm using ssh 5.6p1 release and have met a problem using SFTP with IPV6
address.  Here's a brief.

When I ran command "sftp -6 fe80::217:8ff:fe7c:d91c", SFTP threw out
below error messages.

ssh: Could not resolve hostname fe80: host nor service provided, or not
known
Connection closed


See that the hostname has been cut as "fe80", and of cource this could
not be resolved.  By reading sftp.c, I noticed that this happened in
line 2207.

2207         if ((cp = colon(host)) != NULL) {
2208             *cp++ = '\0';
2209             file1 = cp;
2210         }

The function colon(…) is used to analyze if user's input command is
like “sftp host_address:/directory”.  If it is, colon(…) modifies the
value of “host” from “host_address:/directory” to “host_address”, and
returns value “/directory” to string “cp”.

In current case, I think colon(...) incorrectly cuts a valid IPV6
address.  
Would you please verify this bug and do a fix?  Thanks.

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