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syslog-ng: detect disabled IPv6 on loopback and fallback to IPv4

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Binding in default to IPv6 is preferable but it can be disabled in
kernel and that prevents syslog-ng to start. This setup should not be
that common but syslog is very important service and should survive
that.

This introduces new plugin defining source generator
`network_localhost`. This is used instead of original network source.

Signed-off-by: Karel Kočí <cynerd@email.cz>
This commit is contained in:
Karel Kočí 2020-06-26 11:37:32 +02:00
parent c7dca50f11
commit 43a8f7072e
No known key found for this signature in database
GPG key ID: D83BD732AC2BD828
4 changed files with 12 additions and 2 deletions
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5
admin/syslog-ng/Makefile
View file

@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=syslog-ng
PKG_VERSION:=3.27.1
PKG_RELEASE:=1
PKG_RELEASE:=2
PKG_MAINTAINER:=Josef Schlehofer <josef.schlehofer@nic.cz>
PKG_LICENSE:=LGPL-2.1-or-later GPL-2.0-or-later
@ -87,6 +87,9 @@ define Package/syslog-ng/install
$(INSTALL_DIR) $(1)/sbin
$(INSTALL_BIN) ./files/logread $(1)/sbin
$(INSTALL_DIR) $(1)/usr/share/syslog-ng/include/
$(CP) -r ./files/scl $(1)/usr/share/syslog-ng/include/
endef
define Package/syslog-ng/postinst

6
admin/syslog-ng/files/scl/network_localhost/detect.sh Executable file
View file

@ -0,0 +1,6 @@
#!/bin/sh
if [ "$(sysctl net.ipv6.conf.lo.disable_ipv6 | cut -d' ' -f 3)" = "0" ]; then
echo 'network(ip("::1") port(514) transport(udp) ip-protocol(6) )'
else
echo 'network(ip("127.0.0.1") port(514) transport(udp) ip-protocol(4) )'
fi

1
admin/syslog-ng/files/scl/network_localhost/plugin.conf Normal file
View file

@ -0,0 +1 @@
@module confgen context(source) name(network_localhost) exec("`scl-root`/network_localhost/detect.sh")

2
admin/syslog-ng/files/syslog-ng.conf
View file

@ -26,7 +26,7 @@ source src {
};
source net {
network(ip("::1") port(514) transport(udp) ip-protocol(6));
network_localhost();
};
source s_network {