Re: [msmtp-users] PATCH: bind to source IP

[G H <uothrawn@...1...>]

net_get_canonical_hostname simply calls gethostname() from glibc, and that function just calls uname(); it doesn't appear possible to change the source IP in glibc without using a standalone resolver library.




----- Original Message -----
From: grarpamp <grarpamp@...20...>
To: "msmtp-users@lists.sourceforge.net" <msmtp-users@lists.sourceforge.net>
Cc: 
Sent: Friday, February 20, 2015 2:12 PM
Subject: Re: [msmtp-users] PATCH: bind to source IP

On Fri, Feb 20, 2015 at 9:12 AM, G H <uothrawn@...1...> wrote:

> Patch is attached to cause msmtp to bind to a source IP address before connecting to the remote endpoint. This is useful for source-based routing. Note that DNS lookups will still be going out your default interface; use a local dnsmasq or IPtables SNATing to fix this.

I would have thought binding to specific ip/alias/interface in
case of multiple being present was already in msmtp.
Thanks for bringing up this feature.

Aren't there functions in the resolver libs for that? (Here I see one
for switching to TCP connections but so far not for setting src ip.
If not, this should be ticketed upstream as feature request in linux/bsd.)

You could also bind a named/unbound instance and point the
resolver there.
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