Bug Description
Before I start
: I know that
the author of Dibbler considers this software unmaintained (https
://klub
.com
.pl/dhcpv6/); yet it is included in
the repositories, so here I am with this bug report
.
== Issue #1
: Dibbler binds to incorrect 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
-client is no longer capable of starting up and binding to
the PPPoE (PPP) interface created as part of my connection 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,LO
WER_UP> mtu 1492 qdisc cake state UNKNOWN group default qlen 3
inet6 fe80
::8157
:b42e
:45ec
:96ae peer fe80
::427c
:7dff
:fe93
:d231/128 scope link
valid_lft forever preferred_lft forever
fe80
::8157
:b42e
:45ec
:96ae is my side of
the point to point link
fe80
::427c
:7dff
:fe93
:d231 is
the ISP side of
the point to point link
(
The addresses change on every reconnection, it's nothing sensitive
.)
The error logs from Dibbler
-client
were
:
Apr 25 11
:00
:39 router
.local systemd[1]
: Starting LSB
: Starts DHCPv6 client
...
Apr 25 11
:00
:39 router
.local dibbler
-client[86944]
: Starting DHCPv6 client
: dibbler
-client
.
Apr 25 11
:00
:39 router
.local systemd[1]
: Started LSB
: Starts DHCPv6 client
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: PD
: Following interfaces marked as downlink
: br0
.2
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Prefix delegation
option (no parameters) found
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Parsing /etc/dibbler/client
.conf done, result=0(success)
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: 1 interface(s) specified in /etc/dibbler/client
.conf
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Interface ppp999/28 configuration has been loaded
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: DUID's value = 00
:01
:00
:01
:27
:3c
:48
:99
:40
:8d
:5c
:b3
:2a
:ab was loaded from client
-duid file
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: My DUID is 00
:01
:00
:01
:27
:3c
:48
:99
:40
:8d
:5c
:b3
:2a
:ab
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Loading old address database (client
-AddrMgr
.xml),
using built
-in routines
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Unable to open client
-AddrMgr
.xml
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Bind reuse enabled (multiple instances allo
wed)
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Creating control (
::) socket on
the lo/1 interface
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Creating socket (addr=fe80
::427c
:7dff
:fe93
:d231) on ppp999/28 interface
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Unable to bind socket (iface=ppp999/28, addr=fe80
::427c
:7dff
:fe93
:d231, port=546)
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Low
-level layer error message
: Unable to bind socket
: Cannot assign requested address
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Socket creation (addr=fe80
::427c
:7dff
:fe93
:d231) on ppp999/28 interface failed
.
Apr 25 11
:00
:39 router
.local DibblerClient[86950]
: Fatal error during TransMgr initialization
.
After a quick review, it became clear that
the dibbler
-client attempts to bind to incorrect IPv6 link local address
. This might be related to how
the new(er?) clients present
the link local addresses
.
Using the script from https
://raw
.githubusercontent
.com/d0u9/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
: 128
local address
: fe80
::8157
:b42e
:45ec
:96ae (flags 128, scope 253)
if address
: fe80
::427c
:7dff
:fe93
:d231 (flags 128, scope 253)
==================================
family
: 6
dev
: tap4
prefix length
: 64
if address
: fe80
::4048
:1aff
:fe2e
:64f4 (flags 128, 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
.736090768 +0200
+++ dibbler
-1
.0
.1/Port
-linux/lowlevel
-linux
.c 2022
-04
-25 23
:30
:35
.889052974 +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]!=0x80) {
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 client
...
Apr 25 23
:39
:45 router
.local dibbler
-client[243724]
: Starting DHCPv6 client
: dibbler
-client
.
Apr 25 23
:39
:45 router
.local systemd[1]
: Started LSB
: Starts DHCPv6 client
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: PD
: Following interfaces marked as downlink
: br0
.2
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Prefix delegation
option (no parameters) found
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Parsing /etc/dibbler/client
.conf done, result=0(success)
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: 1 interface(s) specified in /etc/dibbler/client
.conf
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Interface ppp999/28 configuration has been loaded
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: DUID's value = 00
:01
:00
:01
:27
:3c
:48
:99
:40
:8d
:5c
:b3
:2a
:ab was loaded from client
-duid file
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: My DUID is 00
:01
:00
:01
:27
:3c
:48
:99
:40
:8d
:5c
:b3
:2a
:ab
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Loading old address database (client
-AddrMgr
.xml),
using built
-in routines
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: DB timestamp
:1650922785, now()=1650922785, db is 0 second(s) old
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Auth
: Replay detection value loaded 0
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: All client's 00
:01
:00
:01
:27
:3c
:48
:99
:40
:8d
:5c
:b3
:2a
:ab leases are not valid
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Bind reuse enabled (multiple instances allo
wed)
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Creating control (
::) socket on
the lo/1 interface
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: DEBUG
: realIface
: <IfaceIface name="ppp999" ifindex="28" hwType="512" flags="0x110d1" mBit="0" oBit="0">
<!
-- no
-loopback running multicast
-->
<!
-- PrefixLength configured to 128
-->
<!
-- 1 link scoped addrs
-->
<Addr>fe80
::8157
:b42e
:45ec
:96ae</Addr>
<!
-- 3 non
-local addrs
-->
2001
:1ae9
:ff2
:xxxx
::1 2001
:1ae9
:ff2
:xxxx
:faf0
:100c
:edd5
:ed6d 2001
:1ae9
:ff2
:xxxx
:8157
:b42e
:45ec
:96ae <Mac></Mac>
</IfaceIface>
, Interface
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Creating socket (addr=fe80
::8157
:b42e
:45ec
:96ae) on ppp999/28 interface
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Initialising link
-state detection for interfaces
: ppp999/28
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: CONFIRM support compiled in
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Creating SOLICIT message with 0 IA(s), no TA and 1 PD(s) on ppp999/28 interface
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Sending SOLICIT(opts
:1 25 8 ) on ppp999/28 to multicast
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Sleeping for 1 second(s)
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Received 81 bytes on interface ppp999/28 (socket=3, addr=fe80
::427c
:7dff
:fe93
:d231)
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Received ADVERTISE on ppp999/28,trans
-id=0x655732, 3 opts
: 2 1 25
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Script execution skipped for ADVERTISE response to SOLICIT
. No action needed for this message type
.
Apr 25 23
:39
:45 router
.local DibblerClient[243730]
: Sleeping for 1 second(s)
.
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: Processing msg (SOLICIT,transID=0x655732,opts
: 1 25 8)
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: Creating REQUEST
. Backup server list contains 1 server(s)
.
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: Advertise from Server ID=00
:03
:00
:01
:40
:7c
:7d
:93
:d2
:31, no preference
option, assumed 0
.[
using this]
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: Sending REQUEST(opts
:1 25 2 8 ) on ppp999/28 to multicast
.
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: Sleeping for 1 second(s)
.
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: Received 81 bytes on interface ppp999/28 (socket=3, addr=fe80
::427c
:7dff
:fe93
:d231)
.
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: Received REPLY on ppp999/28,trans
-id=0xd529db, 3 opts
: 2 1 25
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: PD
: Adding 2001
:1ae9
:xxxx
:xx00
:: prefix to PD (iaid=1) to addrDB
.
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: PD
: Adding prefix 2001
:1ae9
:xxxx
:xx00
::/56 to all interfaces (prefix will be split to /64 prefixes if necessary)
.
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: PD
: Using 1 suitable interface(s)
:br0
.2
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: PD
: Adding prefix 2001
:1ae9
:xxxx
:xx00
::/56 on
the br0
.2/13 interface
.
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: RENEW(IA_PD) will be sent (T1) after 1800, REBIND (T2) after 2880 seconds
.
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: About to execute /etc/dibbler/client
-notify
.sh script, 15 variables
.
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: Script execution complete, return code=0
Apr 25 23
:39
:46 router
.local DibblerClient[243730]
: Sleeping for 1799 second(s)
.
== Issue #2
: Post
-install script fails ==
This is yet ano
ther 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, ca
using the whole installation to fail
:
Preparing to unpack
.../dibbler
-client_1
.0
.1
-1build2_amd64
.deb
...
Unpacking dibbler
-client (1
.0
.1
-1build2) over (1
.0
.1
-1build2)
...
Setting up dibbler
-client (1
.0
.1
-1build2)
...
Error
: The new file /etc/dibbler/client
.conf
-dpkg
-new does not exist!
dpkg
: error processing package dibbler
-client (
--install)
:
installed dibbler
-client package post
-installation script subprocess returned error exit status 1
Processing triggers for man
-db (2
.10
.2
-1)
...
Errors
were encountered while processing
:
dibbler
-client
This can be fixed by creating
the conf
-new
version at all times
:
--- dibbler
-client
.postinst 2022
-04
-25 23
:52
:28
.891596403 +0200
+++ /home/work/dibbler/dibbler
-1
.0
.1/debian/dibbler
-client
.postinst 2022
-04
-25 23
:39
:40
.203950174 +0200
@@
-30,6 +30,8 @@
rm ${CONFFILE_NEW}
fi
+touch ${CONFFILE_NEW}
+
db_
version 2
.0
#db_capb backup
db_settitle dibbler
-client/title
== Issue #3
: Dibbler rebuild fails ==
To rebuild
the package on Ubuntu 22
.04 with
the latest gcc, I had to supply
the "
-fcommon" flag explicitly
:
apt
-get source dibbler
-client
apt
-get build
-deps dibbler
-client
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+0x0)
: multiple definition of `interface_do_message'; libLowLevel_a
-lowlevel
-linux
-link
-state
.o (symbol from plugin)
:(
.text+0x0)
: first defined here
/usr/bin/ld
: libLowLevel_a
-interface
.o (symbol from plugin)
: in function `daemon_log'
:
(
.text+0x0)
: multiple definition of `interface_auto_up'; libLowLevel_a
-lowlevel
-linux
-link
-state
.o (symbol from plugin)
:(
.text+0x0)
: first defined here
./Port
-linux/daemon
.h
:30
:5
: warning: 'die' violates
the C++ One Definition Rule [
-Wodr]
30 | int die(const char * pidfile);
| ^
Port
-linux/daemon
.cpp
:191
:6
: note
: return value type mismatch
191 | void die(const char * pidfile) {
| ^
Port
-linux/daemon
.cpp
:191
:6
: note
: type 'void' should match type 'int'
Port
-linux/daemon
.cpp
:191
:6
: note
: 'die' was previously declared here
collect2
: error
: ld returned 1 exit status
make[2]
: *** [Makefile
:629
: dibbler
-client] Error 1
make[2]
: Leaving directory '/home/work/dibbler/dibbler
-1
.0
.1'
make[1]
: *** [Makefile
:816
: all
-recursive] Error 1
make[1]
: Leaving directory '/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 1182
:
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
-client
dibbler
-client
:
Installed
: 1
.0
.1
-1build2
Candidate
: 1
.0
.1
-1
.1
Version table
:
1
.0
.1
-1
.1 500
500 http
://cz
.archive
.ubuntu
.com/ubuntu jammy/universe amd64 Packages
*** 1
.0
.1
-1build2 100
100 /var/lib/dpkg/status
翻译
在使用webpack4结合@babel/polyfill时，若出现与useBuiltIns:usage配置相关的警告，通常是由于未正确声明core-js版本所致。本文详细介绍了如何在.babelrc文件中声明core-js版本，从而避免警告并确保项目正常运行。
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