Bug Description
Before I start: I know that the author of Dibbler con
siders this software unmaintained (https://klub
.com
.pl/dhcpv6/); yet it is included in the repositor
ies, so here I am with this
bug report
.
== Issue #1: Dibbler binds to incorr
ect link-local address of a ppp(oe) interface ==
After upgrading my home router from Ubuntu
20.04 to Ubuntu
22.04, I have noticed that dibbler-cl
ient is no longer capable of starting up and binding to the PPPoE (PPP) interface created as part of my conn
ection set-up process
.
This is how the link local addresses look like:
rzajic@router:/home/work/dibbler/dibbler-1
.0.1$ ip -6 a s dev ppp999 scope link
28: ppp999: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 149
2 qdisc cake state UNKNOWN group default qlen 3
inet6 fe8
0::8157:b4
2e:45
ec:96ae peer fe8
0::4
27c:7dff:fe93:d
231/1
28 scope link
valid_lft forever preferred_lft forever
fe8
0::8157:b4
2e:45
ec:96ae is my
side of the point to point link
fe8
0::4
27c:7dff:fe93:d
231 is the ISP
side of the point to point link
(The addresses change on every r
econn
ection, it's nothing sensitive
.)
The error logs from Dibbler-cl
ient were:
Apr
25 11:
00:39 router
.local systemd[1]: Starting LSB: Starts DHCPv6 cl
ient
...
Apr
25 11:
00:39 router
.local dibbler-cl
ient[86944]: Starting DHCPv6 cl
ient: dibbler-cl
ient
.
Apr
25 11:
00:39 router
.local systemd[1]: Started LSB: Starts DHCPv6 cl
ient
.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: PD: Following interfaces marked as downlink: br
0.2
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Prefix delegation option (no parameters) found
.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Parsing /etc/dibbler/cl
ient
.conf done, result=
0(success)
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: 1 interface(s) sp
ecif
ied in /etc/dibbler/cl
ient
.conf
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Interface ppp999/
28 configuration has been loaded
.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: DUID's value =
00:
01:
00:
01:
27:3c:48:99:4
0:8d:5c:b3:
2a:ab was loaded from cl
ient-duid file
.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: My DUID is
00:
01:
00:
01:
27:3c:48:99:4
0:8d:5c:b3:
2a:ab
.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Loading old address database (cl
ient-AddrMgr
.xml), using built-in routines
.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Unable to open cl
ient-AddrMgr
.xml.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Bind reuse enabled (multiple instances allowed)
.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Creating control (::) socket on the lo/1 interface
.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Creating socket (addr=fe8
0::4
27c:7dff:fe93:d
231) on ppp999/
28 interface
.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Unable to bind socket (iface=ppp999/
28, addr=fe8
0::4
27c:7dff:fe93:d
231, port=546)
.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Low-level layer error message: Unable to bind socket: Cannot assign requested address
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Socket creation (addr=fe8
0::4
27c:7dff:fe93:d
231) on ppp999/
28 interface failed
.
Apr
25 11:
00:39 router
.local DibblerCl
ient[8695
0]: Fatal error during TransMgr initialization
.
After a quick rev
iew, it b
ecame clear that the dibbler-cl
ient attempts to bind to incorr
ect IPv6 link local address
. This might be related to how the new(er?) cl
ients present the link local addresses
.
Using the script from https://raw
.githubusercontent
.com/d
0u9/examples/master/C/netlink/ip_show
.c, I can see that the link local address on my
side of the point to point link is now represented as "local address", while on non-point to point links the link local addresses are represented as interface addresses
.
==================================
family: 6
dev: ppp999
prefix length: 1
28
local address: fe8
0::8157:b4
2e:45
ec:96ae (flags 1
28, scope
253)
if address: fe8
0::4
27c:7dff:fe93:d
231 (flags 1
28, scope
253)
==================================
family: 6
dev: tap4
prefix length: 64
if address: fe8
0::4
048:1aff:fe
2e:64f4 (flags 1
28, scope
253)
This can be worked around by modifying the low level Linux code (note that there seems to be a
bug in Dibbler code, which uses IFLA_ADDRESS [belongs to layer
2, e
.g
. MAC address] instead of IFA_ADDRESS):
--- lowlevel-linux
.c
2022-
04-
25
23:56:
08
.736
09
0768 +
0200
+++ dibbler-1
.0.1/Port-linux/lowlevel-linux
.c
2022-
04-
25
23:3
0:35
.889
05
2974 +
0200
@@ -
277,7 +
277,7 @@
if (!rta_tb[IFA_LOCAL]) rta_tb[IFA_LOCAL] = rta_tb[IFA_ADDRESS];
if (!rta_tb[IFA_ADDRESS]) rta_tb[IFA_ADDRESS] = rta_tb[IFA_LOCAL];
- memcpy(addr,(char*)RTA_DATA(rta_tb[IFLA_ADDRESS]),16);
+ memcpy(addr,(char*)RTA_DATA(rta_tb[IFA_LOCAL]),16);
if (addr[
0]!=
0xfe || addr[1]!=
0x8
0) {
continue; /* ignore non link-scoped addrs */
}
The local address is always set a few lines above the memcpy() call
.
After rebuild (see Issue #3 below), the process starts, binds and request a prefix (which was my goal at the beginning):
Apr
25
23:39:45 router
.local systemd[1]: Starting LSB: Starts DHCPv6 cl
ient
...
Apr
25
23:39:45 router
.local dibbler-cl
ient[
2437
24]: Starting DHCPv6 cl
ient: dibbler-cl
ient
.
Apr
25
23:39:45 router
.local systemd[1]: Started LSB: Starts DHCPv6 cl
ient
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: PD: Following interfaces marked as downlink: br
0.2
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Prefix delegation option (no parameters) found
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Parsing /etc/dibbler/cl
ient
.conf done, result=
0(success)
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: 1 interface(s) sp
ecif
ied in /etc/dibbler/cl
ient
.conf
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Interface ppp999/
28 configuration has been loaded
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: DUID's value =
00:
01:
00:
01:
27:3c:48:99:4
0:8d:5c:b3:
2a:ab was loaded from cl
ient-duid file
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: My DUID is
00:
01:
00:
01:
27:3c:48:99:4
0:8d:5c:b3:
2a:ab
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Loading old address database (cl
ient-AddrMgr
.xml), using built-in routines
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: DB timestamp:165
09
22785, now()=165
09
22785, db is
0 s
econd(s) old
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Auth: Replay det
ection value loaded
0
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: All cl
ient's
00:
01:
00:
01:
27:3c:48:99:4
0:8d:5c:b3:
2a:ab leases are not valid
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Bind reuse enabled (multiple instances allowed)
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Creating control (::) socket on the lo/1 interface
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: DE
BUG: realIface: <IfaceIface name="ppp999" ifindex="
28" hwType="51
2" flags="
0x11
0d1" mBit="
0" oBit="
0">
<!-- no-loopback running multicast -->
<!-- PrefixLength configured to 1
28 -->
<!-- 1 link scoped addrs -->
<Addr>fe8
0::8157:b4
2e:45
ec:96ae</Addr>
<!-- 3 non-local addrs -->
2001:1ae9:ff
2:xxxx::1
2001:1ae9:ff
2:xxxx:faf
0:1
00c:edd5:ed6d
2001:1ae9:ff
2:xxxx:8157:b4
2e:45
ec:96ae <Mac></Mac>
</IfaceIface>
, Interface
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Creating socket (addr=fe8
0::8157:b4
2e:45
ec:96ae) on ppp999/
28 interface
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Initialising link-state det
ection for interfaces: ppp999/
28
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: CONFIRM support compiled in
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Creating SOLICIT message with
0 IA(s), no TA and 1 PD(s) on ppp999/
28 interface
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Sending SOLICIT(opts:1
25 8 ) on ppp999/
28 to multicast
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Sleeping for 1 s
econd(s)
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: R
eceived 81 bytes on interface ppp999/
28 (socket=3, addr=fe8
0::4
27c:7dff:fe93:d
231)
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: R
eceived ADVERTISE on ppp999/
28,trans-id=
0x65573
2, 3 opts:
2 1
25
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Script ex
ecution skipped for ADVERTISE response to SOLICIT
. No action needed for this message type
.
Apr
25
23:39:45 router
.local DibblerCl
ient[
24373
0]: Sleeping for 1 s
econd(s)
.
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: Processing msg (SOLICIT,transID=
0x65573
2,opts: 1
25 8)
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: Creating REQUEST
. Backup server list contains 1 server(s)
.
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: Advertise from Server ID=
00:
03:
00:
01:4
0:7c:7d:93:d
2:31, no preference option, assumed
0.[using this]
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: Sending REQUEST(opts:1
25
2 8 ) on ppp999/
28 to multicast
.
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: Sleeping for 1 s
econd(s)
.
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: R
eceived 81 bytes on interface ppp999/
28 (socket=3, addr=fe8
0::4
27c:7dff:fe93:d
231)
.
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: R
eceived REPLY on ppp999/
28,trans-id=
0xd5
29db, 3 opts:
2 1
25
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: PD: Adding
2001:1ae9:xxxx:xx
00:: prefix to PD (iaid=1) to addrDB
.
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: PD: Adding prefix
2001:1ae9:xxxx:xx
00::/56 to all interfaces (prefix will be split to /64 prefixes if n
ecessary)
.
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: PD: Using 1 suitable interface(s):br
0.2
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: PD: Adding prefix
2001:1ae9:xxxx:xx
00::/56 on the br
0.2/13 interface
.
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: RENEW(IA_PD) will be sent (T1) after 18
00, REBIND (T
2) after
288
0 s
econds
.
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: About to ex
ecute /etc/dibbler/cl
ient-notify
.sh script, 15 variables
.
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: Script ex
ecution complete, return code=
0
Apr
25
23:39:46 router
.local DibblerCl
ient[
24373
0]: Sleeping for 1799 s
econd(s)
.
== Issue #
2: Post-install script fails ==
This is yet another issue spotted as part of the installation
. Maybe it would deserve a separate
bug report - who knows
. Anyway, here it is:
The postinst script fails, causing the whole installation to fail:
Preparing to unpack
.../dibbler-cl
ient_1
.0.1-1build
2_amd64
.deb
...
Unpacking dibbler-cl
ient (1
.0.1-1build
2) over (1
.0.1-1build
2)
...
Setting up dibbler-cl
ient (1
.0.1-1build
2)
...
Error: The new file /etc/dibbler/cl
ient
.conf-dpkg-new does not exist!
dpkg: error processing package dibbler-cl
ient (--install):
installed dibbler-cl
ient package post-installation script subprocess returned error exit status 1
Processing triggers for man-db (
2.1
0.2-1)
...
Errors were encountered while processing:
dibbler-cl
ient
This can be fixed by creating the conf-new version at all times:
--- dibbler-cl
ient
.postinst
2022-
04-
25
23:5
2:
28
.8915964
03 +
0200
+++ /home/work/dibbler/dibbler-1
.0.1/debian/dibbler-cl
ient
.postinst
2022-
04-
25
23:39:4
0.20395
0174 +
0200
@@ -3
0,6 +3
0,8 @@
rm ${CONFFILE_NEW}
fi
+touch ${CONFFILE_NEW}
+
db_version
2.0
#db_capb backup
db_settitle dibbler-cl
ient/title
== Issue #3: Dibbler rebuild fails ==
To rebuild the package on Ubuntu
22.04 with the la
test gcc, I had to supply the "-fcommon" flag explicitly:
apt-get source dibbler-cl
ient
apt-get build-deps dibbler-cl
ient
cd dibbler-1
.0.1/
DEB_CPPFLAGS_SET="-fcommon" DEB_CFLAGS_SET="-fcommon" debuild -us -uc -i -b
Without that backwards compatibility flag, build fails on this error:
/usr/bin/ld: libLowLevel_a-interface
.o (symbol from plugin): in function `daemon_log':
(
.text+
0x
0): multiple definition of `interface_do_message'; libLowLevel_a-lowlevel-linux-link-state
.o (symbol from plugin):(
.text+
0x
0): first defined here
/usr/bin/ld: libLowLevel_a-interface
.o (symbol from plugin): in function `daemon_log':
(
.text+
0x
0): multiple definition of `interface_auto_up'; libLowLevel_a-lowlevel-linux-link-state
.o (symbol from plugin):(
.text+
0x
0): first defined here
./Port-linux/daemon
.h:3
0:5: warning: 'd
ie' violates the C++ One Definition Rule [-Wodr]
3
0 | int d
ie(const char * pidfile);
| ^
Port-linux/daemon
.cpp:191:6: note: return value type mismatch
191 | void d
ie(const char * pidfile) {
| ^
Port-linux/daemon
.cpp:191:6: note: type 'void' should match type 'int'
Port-linux/daemon
.cpp:191:6: note: 'd
ie' was previously d
eclared here
coll
ect
2: error: ld returned 1 exit status
make[
2]: *** [Makefile:6
29: dibbler-cl
ient] Error 1
make[
2]: Leaving dir
ectory '/home/work/dibbler/dibbler-1
.0.1'
make[1]: *** [Makefile:816: all-r
ecursive] Error 1
make[1]: Leaving dir
ectory '/home/work/dibbler/dibbler-1
.0.1'
dh_auto_build: error: make -j1 returned exit code
2
make: *** [debian/rules:16: build] Error
25
dpkg-buildpackage: error: debian/rules build subprocess returned exit status
2
debuild: fatal error at line 118
2:
dpkg-buildpackage -us -uc -ui -i -b failed
== System info ==
# lsb_release -rd
Description: Ubuntu
22.04 LTS
Release:
22.04
# Shows my rebuild/patched version
# apt-cache policy dibbler-cl
ient
dibbler-cl
ient:
Installed: 1
.0.1-1build
2
Candidate: 1
.0.1-1
.1
Version table:
1
.0.1-1
.1 5
00
5
00 http://cz
.archive
.ubuntu
.com/ubuntu jammy/universe amd64 Packages
*** 1
.0.1-1build
2 1
00
1
00 /var/lib/dpkg/status
翻译
在ECSide2.0版本中，发现Opera浏览器下数据量较少时，内容列表与分页工具条间出现空白间隙。此问题在IE7和Firefox2中未出现。源代码中内容列表高度被固定，建议使用百分比表示。另外，Opera下分页功能也存在问题。
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