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dns-resolve: Allow unbound's config file to be set through an env var.

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When an unbound context is created, check whether OVS_UNBOUND_CONF has been
set. If a valid config file is supplied then use it to configure the
context. The procedure returns if the config file is invalid. If no config
file is found then the default unbound config is used.

Reviewed-by: Yifeng Sun <pkusunyifeng@gmail.com>
Signed-off-by: Ted Elhourani <ted.elhourani@nutanix.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
This commit is contained in:
Ted Elhourani 2020-10-06 20:25:56 +00:00 committed by Ilya Maximets
parent b0672f4ba2
commit f00c47b8f3
3 changed files with 17 additions and 1 deletions
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4
Documentation/intro/install/general.rst
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@ -97,7 +97,9 @@ need the following software:
specifying OpenFlow and OVSDB remotes. If unbound library is already
installed, then Open vSwitch will automatically build with support for it.
The environment variable OVS_RESOLV_CONF can be used to specify DNS server
configuration file (the default file on Linux is /etc/resolv.conf).
configuration file (the default file on Linux is /etc/resolv.conf), and
environment variable OVS_UNBOUND_CONF can be used to specify the
configuration file for unbound.
On Linux, you may choose to compile the kernel module that comes with the Open
vSwitch distribution or to use the kernel module built into the Linux kernel

2
NEWS
View File

@ -5,6 +5,8 @@ Post-v2.14.0
status of the storage that's backing a database.
- DPDK:
* Removed support for vhost-user dequeue zero-copy.
- The environment variable OVS_UNBOUND_CONF, if set, is now used
as the DNS resolver's (unbound) configuration file.
v2.14.0 - 17 Aug 2020

12
lib/dns-resolve.c
View File

@ -82,6 +82,18 @@ dns_resolve_init(bool is_daemon)
return;
}
const char *ub_conf_filename = getenv("OVS_UNBOUND_CONF");
if (ub_conf_filename != NULL) {
int retval = ub_ctx_config(ub_ctx__, ub_conf_filename);
if (retval != 0) {
VLOG_WARN_RL(&rl, "Failed to set libunbound context config: %s",
ub_strerror(retval));
ub_ctx_delete(ub_ctx__);
ub_ctx__ = NULL;
return;
}
}
const char *filename = getenv("OVS_RESOLV_CONF");
if (!filename) {
#ifdef _WIN32