sshfs fails to connect when using an IPv6 host in combination with -o directport

[thallgren]

An attempt to connect to an IPv6 host using the flag -o directport=<port> similar to:

/usr/bin/sshfs [2001:db8:1::3]:/path /mnt/path -o directport=41955 ...

will always fail.

The likely reason for this can be found in the connect_to function at sshfs.c line 1260 where the family is set to PF_INET. There's never an attempt to connect using PF_INET6.

[h4sh5]

@thallgren thank you for your report - can you also show what your error message is when it does fail? Thanks!

[thallgren]

Sample output (using -v -d):

/usr/bin/sshfs -F none -f -C -o ConnectTimeout=10 -o ServerAliveInterval=5 -o follow_symlinks -o auto_unmount -o allow_root -v -d -o directport=35447 [2001:db8:1::3]:/tel_app_exports /mnt/volumes/2001_db8_1__3/35447
SSHFS version 3.7.3
failed to resolve 2001:db8:1::3:35447: Name has no usable address
fusermount3: /mnt/volumes/2001_db8_1__3/35447 not mounted

[h4sh5]

@thallgren Can you please compile this PR #336 and test if it works?

[thallgren]

I tested #366, and it works ok:

./sshfs -F none -f -C -o ConnectTimeout=10 -o ServerAliveInterval=5 -o follow_symlinks -o auto_unmount -o allow_root -v -d -o directport=8833 '[2001:db8:1::3]:/tel_app_exports' /tmp/mymount 
 
SSHFS version 3.7.3
using ipv6 to connect to host 2001:db8:1::3
Server version: 3
Extension: hardlink@openssh.com <1>
Extension: posix-rename@openssh.com <1>
Extension: statvfs@openssh.com <2>
[00001] STAT
  [00001]         STATUS       76bytes (1ms)
...

Big thanks for addressing this so quickly.