Don't return arcount=1 if EDNS0 RR won't fit in the packet.
Omitting the EDNS0 RR but setting arcount gives a malformed packet.
Also, don't accept UDP packet size less than 512 in received EDNS0.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Remove LEDE partial fix for CVE-2017-13704.
Backport official fix from upstream.
Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com> (PKG_RELEASE increase)
Fix SIGSEGV in rfc1035.c answer_request() line 1228 where memset()
is called with header & limit pointing at the same address and thus
tries to clear memory from before the buffer begins.
answer_request() is called with an invalid edns packet size provided by
the client. Ensure the udp_size provided by the client is bounded by
512 and configured maximum as per RFC 6891 6.2.3 "Values lower than 512
MUST be treated as equal to 512"
The client that exposed the problem provided a payload udp size of 0.
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
Acked-by: Hans Dedecker <dedeckeh@gmail.com>
Currently, dnsmasq support assigning multiple tags to a host record
(--dhcp-host), but we only support only 1 tag for a host. The commit
makes the following config to be valid:
config host
option name 'computer'
option mac '00:11:22:33:44:55'
option ip '192.168.1.100'
list tag 'vendor_class'
list tag 'vendor_id'
config tag 'vendor_class'
list dhcp_option 'option:vendor-class,00:...<omitted>'
config tag 'vendor_id'
option force '1'
list dhcp_option 'option:vendor-id-encap,00:...<omitted>'
Signed-off-by: Kuang Rufan <kuangrufan@pset.suntec.net>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Remove ping check in DHCPDISCOVER case as too many buggy clients leave
an interface in configured state causing the ping check to fail.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Commit 5cd88f4 "dnsmasq: remove use of uci state for getting network ifname"
broke the ability to specify unmanaged network device names for inclusion
and exclusion in the uci configuration.
Restore support for raw device names by falling back to the input value
when "network_get_device" yields no result.
Fixes FS#876.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
This is functionally the same as --server, but provides some syntactic sugar to
make specifying address-to-name queries easier.
For example --rev-server=1.2.3.0/24,192.168.0.1 is exactly equivalent to
--server=/3.2.1.in-addr.arpa/192.168.0.1
Signed-off-by: DUPONCHEEL Sébastien <sebastien.duponcheel@corp.ovh.com>
Don't start ping-check of address in DHCP discover if there already
exists a lease for the address. It has been reported under some
circumstances android and netbooted windows devices can reply to
ICMP pings if they have a lease and thus block the allocation of
the IP address the device already has during boot.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
dnsmasq can match tags in its dhcp-range configuration, this commit adds
the option to configure it in the dhcp section
uci configuration:
config dhcp 'lan'
option interface 'lan'
list tag 'blue'
list tag '!red'
option start '10'
option limit '150'
option leasetime '12h'
generated dnsmasq configuration:
dhcp-range=tag:blue,tag:!red,set:lan,192.168.1.10,192.168.1.159,255.255.255.0,12h
Signed-off-by: Grégoire Delattre <gregoire.delattre@gmail.com>
With this patch the dnsmasq init script manages resolv.conf if and only if
when dnsmasq will listen on 127.0.0.1#53 (is main resolver instance).
Also, resolvfile is now set irrespective of the value of noresolv.
Fixes (partially) FS#785
Signed-off-by: Paul Oranje <por@xs4all.nl>
'non-wildcard' interfaces enables dnsmasq's '--bind-dynamic' mode. This
binds to interfaces rather than wildcard addresses *and* keeps track of
interface comings/goings via a unique Linux api.
Quoting dnsmasq's author "bind-dynamic (bind individual addresses, keep
up with changes in interface config) ... On linux, there's actually no
sane reason not to use --bind-dynamic, and it's only not the default for
historical reasons."
Let's change history, well on LEDE at least, and change the default!
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
Commit b32689afd6 added support for dhcp-script hook.
Adding dhcp-script config option results into two instances of dnsmasq being run
which triggered oom issues on platforms having low memory.
The dnsmasq dhcp-script config option will now only be added if at least one of the
dhcp, tftp, neigh hotplug dirs has a regular hotplug file or if the dhcpscript uci
config option is specified.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Adds a script which acts as a hook for when dnsmasq creates/destroys a
lease, or completes a TFTP file transfer. The hook loops through scripts
in appropriate directories inside '/etc/hotplug.d', executing each one with
the same arguments supplied by dnsmasq.
In case dnsmasq is jailed by ujail the dhcp-script hook will not work as
expected as ujail does not yet support executing a script within a jail.
Signed-off-by: Nick Brassel <nick@tzarc.org>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Some small tweaks and improvements :
9828ab1 Fix compiler warning.
f77700a Fix compiler warning.
0fbd980 Fix compiler warning.
43cdf1c Remove automatic IDN support when building i18n.
ff19b1a Fix &/&& confusion.
2aaea18 Add .gitattributes to substitute VERSION on export.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
When in ra server mode, configure nameservers passed in router
announcements from the dns value (which is already used by odhcpd).
This also fixes FS#677 by using the global IPv6 address of the router
instead of the link local address (if no nameservers are configured).
Signed-off-by: Arjen de Korte <build+lede@de-korte.org>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com> [PKG_RELEASE increase]
This patch adds the interface-name option for each dhcp config
in /etc/config/dhcp.
With the interface_name option users can define a DNS name for each dhcp section
that will be resolved by dnsmasq with the underlaying interface address.
For example:
config dhcp 'lan'
option interface 'lan'
...
list interface_name 'home.lan'
...
Signed-off-by: Daniel Danzberger <daniel@dd-wrt.com>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com> [PKG_RELEASE increase]
A number of small tweaks & improvements on the way to a final release.
Most notable:
Improve DHCPv4 address-in-use check.
Remove the recently introduced RFC-6842 (Client-ids in DHCP replies)
support as it turns out some clients are getting upset.
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
RFC 6761 defines a number of top level domains should not be forwarded
to the Internet's domain servers since they are not responsible for
those domains.
This change adds a list of domains that will be blocked when 'boguspriv'
is used and augments that which is already blocked by dnsmasq's notion
of 'local service' using '--bogus-priv' i.e. RFC 1918 private addresses
and IPv6 prefixes as defined in RFC 6303.
To make this configurable rather than hard coded in dnsmasq's init
script, a new file /usr/share/dnsmasq/rfc6761.conf is conditionally
included.
The default file matches the RFC 6761 recommendation along with a few
other top level domains that should not be forwarded to the Internet.
Compile & run tested Archer C7 v2
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
--bogus-priv now applies to IPv6 prefixes as specified in RFC6303 - this
is significantly friendlier to upstream servers.
CNAME fix in auth mode - A domain can only have a CNAME if it has no
other records
Drop 2 patches now included upstream.
Compile & run tested Archer C7 v2
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
New test release (since test1) includes 2 LEDE patches that are
upstream and may be dropped, along with many spelling fixes.
Add forthcoming 2017 root zone trust anchor to trust-anchors.conf.
Backport 2 patches that just missed test3:
Reduce logspam of those domains handled locally 'local addresses only'
Implement RFC-6842 (Client-ids in DHCP replies)
Compile & run tested Archer C7 v2
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
Bump to dnsmasq 2.77test1 - this includes a number of fixes since 2.76
and allows dropping of 2 LEDE carried patches.
Notable fix in rrfilter code when talking to Nominum's DNS servers
especially with DNSSEC.
A patch to switch dnsmasq back to 'soft fail' for SERVFAIL responses
from dns servers is also included. This mean dnsmasq tries all
configured servers before giving up.
A 'localise queries' enhancement has also been backported (it will
appear in test2/rc'n') this is especially important if using the
recently imported to LEDE 'use dnsmasq standalone' feature 9525743c
I have been following dnsmasq HEAD ever since 2.76 release.
Compile & Run tested: ar71xx, Archer C7 v2
Tested-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
dnsmasq has sufficient services to meet the needs of DHCP
and RA with IP6 for single router router users. This is
the most common use for consumer routers. Its reenforced
as most ISP tend to only DHCP-PD /64. dnsmasq has year
over year demonstrated great flexibility in its option
set, and support for off-standard DHCP clients.
odhcpd has enhanced capabilities focused on IP6 such
as DHCP/RA relay and NDP proxy. However, it is not as
flexible in its option set. odhcpd is not as forgiving
with off-standard DHCP clients. Some points may represent
a long term TODO list, but it is the state currently.
These changes make any such combination possible. Already
odhcpd can be set as the main dhcp server. Now odhcpd
can be removed or disabled and dnsmasq will take over
if DHCPv6 compiled in. The existing DHCPv6 and RA UCI
are translated into dnsmasq.conf. The changes focus on
'--dhcp-range', '--dhcp-host', and '--dhcp-options'.
DHCP host ID is least 16 bits [::1000-::FFFF], but
leaves low range for typical infrastructure assignments.
dnsmasq accepts DHCPv6 options in the tranditional
'--dhcp-option' put they must be prefixed 'option6:'.
dnsmasq will also discover SLAAC DNS entries from DHCPv4
clients MAC, and confirm with a ping at least renew.
Long term TODO include improving use of dnsmasq relay
options for DHCPv4 and DHCPv6 in parallel. It would also
be possible to preconfigure DHCP-PD in host-with-options
records for fixed infrastructure.
Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>
[Jo-Philipp Wich: emit proper IPv6 hostid format in dhcp-host directive]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
ref commit 612e2276b4
ref commit ec63e3bf13
'option add_local_hostname' scripted implementation statically assigns
this host in auto generated host file at init. If IFUP or other signals
do not occur, then address changes are not tracked. The script doesn't
apply all the addresses at an interface. This may make logs obscure.
The script only puts the bare host name (maybe not FQDN) in host file,
but if '--exapandhosts' is enabled, then /etc/hosts entries will be
suffixed, and "127.0.0.1 localhost" becomes "localhost.lan".
dnsmasq provides an option to perform this function, but it is rather
greedy. '--interface-name=<name>,<iface>' will assign the name to all
IP on the specified interface (except link local). This is a useful
feature, but some setups depend on the original restrictive behavior.
'option add_local_fqdn' is added to enhance the feature set, but
if not entered or empty string, then it will default to original
option and behavior. This new option has a few settings. At each
increased setting the most detailed name becomes the PTR record:
0 - same as add_local_hostname 0 or disabled
1 - same as add_local_hostname 1
2 - assigns the bare host name to all IP w/ --dnsmasq-interface
3 - assigns the FQDN and host to all IP w/ --dnsmasq-interface
4 - assigns <iface>.<host>.<domain> and above w/ --dnsmasq-nterface
'option add_wan_fqdn' is added to run the same procedure on
inferred WAN intefaces. If an interface has 'config dhcp' and
'option ignore 1' set, then it is considered WAN. The original
option would only run on DHCP serving interfaces.
Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>
This causes problem when a FQDN is configured in /etc/config/system. The
domain name will appear twice in reverse DNS.
Next to that, there seems to be a bug in dnsmasq. From the manual page:
--interface-name=<name>,<interface>[/4|/6]
Return a DNS record associating the name with the primary address
on the given interface. This flag specifies an A or AAAA record for the
given name in the same way as an /etc/hosts line, except that the address
is not constant, but taken from the given interface. The interface may be
followed by "/4" or "/6" to specify that only IPv4 or IPv6 addresses
of the interface should be used. If the interface is down, not configured
or non-existent, an empty record is returned. The matching PTR record is
also created, mapping the interface address to the name. More than one name
may be associated with an interface address by repeating the flag; in that
case the first instance is used for the reverse address-to-name mapping.
It does not just create an A/AAAA record for the primary address, it creates
one for all addresses. And what is worse, it seems to actually resolve to the
non-primary address first. This is quite annoying when you use floating IP
addresses (e.g. VRRP), because when the floating IP is on the other device,
SSH failes due to incorrect entry in the known hosts file.
I know that this is not a common setup, but it would be nice if there was an
option to restore the previous behaviour, rather than just forcing this new
feature on everybody.
Reported-by: Stijn Tintel <stijn@linux-ipv6.be>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
'add_local_hostname' previous implementation may drop some addresses.
Soft addition of IP6 addresses may not cause a reload or restart event.
dnsmasq '--interface-name' robustly applies DNS to all addresses per
interface (except fe80::/10).
Change UCI 'add_local_hostname' to expand during each interface assignement
during add_dhcp().
Assign '<iface>.<host>.<domain>' as true name (reflexive A, AAAA, and PTR).
Assign '<host>.<domain>' and '<host>' as convinience aliases (no PTR, not
technically CNAME).
This is accomplished with the '--interface-name' order, first is PTR.
We could also assign each <ip4/6>.<iface>.<host>.<domain> to the respective
dual stack on the interface.
That seemed excessive so it was skipped (/4 or /6 suffix to the interface).
Add UCI 'add_wan_hostname' similar to 'add_local_hostname' function for
external WAN.
WAN IP4 are less often named by the ISP and rarely WAN IP6 due to complexity.
For logs, LuCI connection graph, and other uses assigning a WAN name is desired.
'add_local_hostname' only applies with DHCP and 'add_wam_hostname' only applies
without DHCP. Common residential users will want to set both options TRUE.
Businesses will probably have global DNS, static IP, and 'add_wan_hostname' FALSE.
Signed-off-by: Eric Luehrsen <ericluehrsen@hotmail.com>
Let dnsmasq read all hosts files in /tmp/hosts directory by specifying
/tmp/hosts as argument of --addn-host
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Adds the mac address of the DNS requestor to DNS queries which
are forwarded upstream and can be used to do filtering by the
upstream servers. This only works if the requestor is on the
same subnet as the dnsmasq server
The addmac parameter can hold the following values:
0 : mac address is not added
1 : mac address is added in binary format
base64 : mac address is added base64 encoded
text: : mac address is added in human readable format
as hex and colons
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Permit users of the full variant to disable the NO_ID *.bind pseudo
domain masking.
Defaulted 'on' in all variants.
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
Don't expose dnsmasq version & other data to clients via the *.bind
pseudo domain. This uses a new 'NO_ID' compile time option which has been
discussed and submitted upstream.
This is an alternate to replacing version with 'unknown' which affects
the version reported to syslog and 'dnsmasq --version'
Run time tested with & without NO_ID on Archer C7 v2
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
By default dnsmasq uses the time function; which returns the time since
Epoch; to retrieve the current time. On boards which have no realtime
clock this can lead to side effects when the time is synced via ntp
as the "time wrap" forces dhcp leases to be considered as expired.
By enabling the broken realtime clock build switch dnsmasq uses the
times utility which returns the number of clock tick.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
[Jo-Philipp Wich: change symbol name, add sym to PKG_CONFIG_DEPENDS]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Change dnsmasq's dnssec time check handling to use time validity
indicated by ntpd rather than maintaining a cross boot/upgrade
/etc/dnsmasq.time timestamp file. This saves flash device wear.
If ntpd client is configured in uci and you're using dnssec, then
dnsmasq will not check dnssec timestamp validity until ntpd hotplug
indicates sync via a stratum change. The ntpd hotplug leaves a status
flag file to indicate to dnsmasq.init that time is valid and that it
should now start in 'check dnssec timestamp valid' mode.
If ntpd client is not configured and you're using dnssec, then it is
presumed you're using an alternate time sync mechanism and that time is
correct, thus dnsmasq checks dnssec timestamps are valid from 1st start.
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
V2 - stratum & step ntp changes indicate time is valid
V3 - on initial flag file step signal dnsmasq with SIGHUP if running
V4 - only accept step ntp changes. Accepting both stratum & step could
result in unpleasant script race conditions
V5 - Actually only accepting stratum is the correct thing to do after
further testing
V6 - improve handling of non busybox ntpd
if sysntpd not executable
dnsmasq checks dnssec timestamps
else
sysntp script disabled - look for timestamp file - allows external mechanism to use hotplug flag file
sysntp script enabled & uci ntp enabled - look for timestamp file
sysntp script enabled & uci ntp disabled - dnsmasq checks dnssec
timestamps
fi
Update to dnsmasq2.76. Refresh patches. Add new patch to fix musl
'poll.h' location warning.
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
conditionally save dnsmasq.time across sysupgrade
dnsmasq uses /etc/dnsmasq.time as record of the last known good
system time to aid its validation of dnssec timestamps. dnsmasq
updates the timestamp on process start/stop once it considers the system
time as valid. The timestamp file should be preserved across system
upgrade but should not be included as part of normal configuration
backups to prevent restores corrupting the current timestamp.
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
conditionally save dnsmasq.time across sysupgrade
dnsmasq uses /etc/dnsmasq.time as record of the last known good
system time to aid its validation of dnssec timestamps. dnsmasq
updates the timestamp on process start/stop once it considers the system
time as valid. The timestamp file should be preserved across system
upgrade but should not be included as part of normal configuration
backups to prevent restores corrupting the current timestamp.
Conntrack support reads the connection track mark associated with
incoming DNS queries and sets the same mark value on the upstream
forwarded DNS query. This can be usefull to track traffic generated
by dnsmasq to associate it with the clients who generate the queries,
usefull for bandwidth accouting and firewall.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Running dnsmasq in a dedicated user/group allows matching its outgoing
traffic more easily using iptables' owner match.
Add UID/GID to the package metadata and append the user/group
parameters to the init script.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
SVN-Revision: 49252
Enable setting a host-specific lease time for static hosts.
The new option is called "leasetime" and the format is similar
as for the default lease time: e.g. 12h, 3d, infinite
Default lease time is used for all hosts for which there is
no host-specific definition.
The option is added to /etc/config/dhcp for the selected hosts:
config host
option name 'Nexus'
option mac 'd8:50:66:55:59:7c'
option ip '192.168.1.245'
option leasetime '2h'
It gets appended to /var/etc/dnsmasq.conf like this:
dhcp-host=d8:50:66:55:59:7c,192.168.1.245,Nexus,2h
Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
SVN-Revision: 48801
Commit 6a7e56b adds support for adding local hostname for own lan ula adress
but if ula prefix is not specified results into an invalid config (address=/OpenWrt.lan/1)
causing dnsmasq not to start up.
Use lanaddr6 when adding local hostname as the lan ula address is constructed based on the
UCI parameters ip6hint and ip6ifaceid and thus not always ula prefix suffixed with 1
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
SVN-Revision: 48495
By default dnsmasq uses random ports for outbound dns queries;
when the minport UCI option is specified the ports used will
always be larger than the specified value.
This is usefull for systems behind firewalls.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
SVN-Revision: 48244
Since r46834, IPv6 support is builtin if selected. Therefor, dependencies
on kmod-ipv6 can no longer be fulfilled, since it is not a module anymore.
Signed-off-by: Arjen de Korte <arjen+openwrt@de-korte.org>
SVN-Revision: 47022
