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Allow binding to both source address and interface in server specs.

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The current --server syntax allows for binding to interface or
address. However, in some (admittedly special) cases it is useful to
be able to specify both. This commit introduces the following syntax
to support binding to both interface and address:

--server X.X.X.X@IP@interface#port

Based on my tests, the syntax is backwards compatible with the current
@IP/interface#port. The code will fail if two interface names are given.

v1->v2:
* Add man page description of the extended server syntax (thanks Simon Kelley)

Signed-off-by: Kristian Evensen <kristian.evensen@gmail.com>
This commit is contained in:
Kristian Evensen
2017-03-22 21:32:50 +00:00
committed by Simon Kelley
parent e33b48700e
commit 4e7694d710
2 changed files with 29 additions and 9 deletions
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16
man/dnsmasq.8
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@@ -467,14 +467,14 @@ to make configuration files clearer in this case.
IPv6 addresses may include a %interface scope-id, eg
fe80::202:a412:4512:7bbf%eth0.
The optional string after the @ character tells
dnsmasq how to set the source of the queries to this
nameserver. It should be an ip-address, which should belong to the machine on which
dnsmasq is running otherwise this server line will be logged and then
ignored, or an interface name. If an interface name is given, then
queries to the server will be forced via that interface; if an
ip-address is given then the source address of the queries will be set
to that address.
The optional string after the @ character tells dnsmasq how to set the source of
the queries to this nameserver. It can either be an ip-address, an interface
name or both. The ip-address should belong to the machine on which dnsmasq is
running, otherwise this server line will be logged and then ignored. If an
interface name is given, then queries to the server will be forced via that
interface; if an ip-address is given then the source address of the queries will
be set to that address; and if both are given then a combination of ip-address
and interface name will be used to steer requests to the server.
The query-port flag is ignored for any servers which have a
source address specified but the port may be specified directly as
part of the source address. Forcing queries to an interface is not