[Bug 2914] New: Use getservbyname(3) for port numbers

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2914

            Bug ID: 2914
           Summary: Use getservbyname(3) for port numbers
           Product: Portable OpenSSH
           Version: 7.7p1
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Miscellaneous
          Assignee: unassigned-bugs at mindrot.org
          Reporter: naddy at mips.inka.de

Created attachment 3186
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3186&action=edit
Patch for resolving port specifications with getservbyname

Is there a reason ssh doesn't consult services(5) for port numbers?

This has irked me forever.  I'd rather write ssh -L icb:localhost:icb
instead of ssh -L 7326, wait, 7236, uhm, grep icb /etc/services...

I don't think there is any syntactic ambiguity since Unix sockets
already must contain a '/'.

The patch below adds this:
* Try to resolve a port specification with getservbyname(3) if a
  numeric conversion fails.
* Make the "Port" option in ssh_config handle its argument as a
  port rather than a plain integer.

All other command line switches and configuration file options
already use a2port().

This passes the existing regression tests.

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