DTLS mode crashes

[jonathanpallant]

I was testing wakaama, specifically the example/client binary. If I enable DTLS mode, I get a segmentation fault:

jonathan@DAMOGRAN:~/LocalDocs/wakaama/examples/client/build$ cmake .. -DDTLS=ON -DCMAKE_BUILD_TYPE=Debug
-- Configuring done
-- Generating done
-- Build files have been written to: /home/jonathan/LocalDocs/wakaama/examples/client/build
jonathan@DAMOGRAN:~/LocalDocs/wakaama/examples/client/build$ make
Scanning dependencies of target lwm2mclient
[  2%] Building C object CMakeFiles/lwm2mclient.dir/lwm2mclient.c.o
[  4%] Linking C executable lwm2mclient
[100%] Built target lwm2mclient
jonathan@DAMOGRAN:~/LocalDocs/wakaama/examples/client/build$ gdb --args ./lwm2mclient -4 -n my_test_host -h leshan.eclipseprojects.io -p 5684 -i test-key -s 00112233 -c
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Reading symbols from ./lwm2mclient...
(gdb) run
Starting program: /home/jonathan/LocalDocs/wakaama/examples/client/build/lwm2mclient -4 -n my_test_host -h leshan.eclipseprojects.io -p 5684 -i test-key -s 00112233 -c
Trying to bind LWM2M Client to port 56830
[lwm2m_init:65] Entering
[lwm2m_configure:272] endpointName: "my_test_host", msisdn: "", altPath: "", numObject: 9
LWM2M Client "my_test_host" started on port 56830
> [lwm2m_stringToUri:227] buffer_len: 6, buffer: "/3/0/9"
[lwm2m_stringToUri:283] Parsed characters: 6
[lwm2m_stringToUri:284] /3/0/9
New Battery Level: 96
[lwm2m_data_new:160] size: 1
[lwm2m_data_encode_nstring:277] length: 2, string: "96"
[lwm2m_data_encode_opaque:251] length: 2
[lwm2m_data_decode_int:299] Entering
[lwm2m_data_decode_int:362] result: 1, value: 96
value changed!
[lwm2m_resource_value_changed:474] /3/0/9
[lwm2m_data_free:178] size: 1
[lwm2m_step:381] timeoutP: 5
[lwm2m_step:386] State: STATE_INITIAL
[object_getServers:1040] Entering
[lwm2m_data_new:160] size: 1
[lwm2m_data_encode_bool:519] value: false
[lwm2m_data_decode_bool:529] Entering
[lwm2m_data_decode_bool:580] result: 1, value: false
[lwm2m_data_free:178] size: 1
[lwm2m_data_new:160] size: 1
[lwm2m_data_encode_int:289] value: 123
[lwm2m_data_decode_int:299] Entering
[lwm2m_data_decode_int:362] result: 1, value: 123
[lwm2m_data_new:160] size: 1
[lwm2m_data_encode_int:289] value: 123
[lwm2m_data_decode_int:299] Entering
[lwm2m_data_decode_int:362] result: 1, value: 123
[lwm2m_data_free:178] size: 1
[lwm2m_data_new:160] size: 2
[lwm2m_data_encode_int:289] value: 300
[lwm2m_data_encode_string:214] "U"
[lwm2m_data_decode_int:299] Entering
[lwm2m_data_decode_int:362] result: 1, value: 300
[lwm2m_data_free:178] size: 2
[lwm2m_data_free:178] size: 1
[registration_start:1016] State: STATE_REGISTER_REQUIRED
[lwm2m_data_new:160] size: 1
[lwm2m_data_free:178] size: 1
[lwm2m_data_new:160] size: 1
[lwm2m_data_free:178] size: 1
[observe_step:521] Entering
[registration_step:2045] State: STATE_REGISTERING
[object_getRegisterPayloadBufferLength:788] Entering
[object_getRegisterPayload:886] Entering
[lwm2m_data_new:160] size: 1
[lwm2m_data_encode_string:214] "coaps://leshan.eclipseprojects.io:5684"
[lwm2m_data_free:178] size: 1
[lwm2m_data_new:160] size: 1
[lwm2m_data_encode_int:289] value: 0
[lwm2m_data_decode_int:299] Entering
[lwm2m_data_decode_int:362] result: 1, value: 0
[lwm2m_data_free:178] size: 1
[transaction_new:156] method: 2, altPath: "", mID: 63960, token_len: 4
[transaction_new:158] NULL
[transaction_new:238] Exiting on success. new transac=0x8052520
[transaction_send:359] Entering: transaction=0x8052520
Sending 67 bytes to [23.97.187.154]:5684
16 FE FD 00  00 00 00 00  00 00 00 00  36 01 00 00   ............6...
2A 00 00 00  00 00 00 00  2A FE FD 00  00 00 00 5E   *.......*......^
76 00 D5 93  73 65 20 A9  F9 50 FE E0  F5 35 57 B9   v...se ..P...5W.
9E A7 5F A1  98 5E 9A 50  9D 04 5E 00  00 00 02 C0   .._..^.P..^.....
A8 01 00                                             ...
[transaction_step:446] Entering
[lwm2m_step:488] Final timeoutP: 2
[lwm2m_step:490] Final state: STATE_REGISTERING
 -> State: STATE_REGISTERING
60 bytes received from [23.97.187.154]:5684
16 FE FD 00  00 00 00 00  00 00 00 00  2F 03 00 00   ............/...
23 00 00 00  00 00 00 00  23 FE FD 20  14 D4 56 C7   #.......#.. ..V.
28 85 7B 09  51 66 D4 79  01 FE 93 32  77 79 4E 42   (.{.Qf.y...2wyNB
1C 80 F6 91  41 D5 58 EB  30 CF 2D 04                ....A.X.0.-.
Sending 99 bytes to [23.97.187.154]:5684
16 FE FD 00  00 00 00 00  00 00 01 00  56 01 00 00   ............V...
4A 00 01 00  00 00 00 00  4A FE FD 00  00 00 00 5E   J.......J......^
76 00 D5 93  73 65 20 A9  F9 50 FE E0  F5 35 57 B9   v...se ..P...5W.
9E A7 5F A1  98 5E 9A 50  9D 04 5E 00  20 14 D4 56   .._..^.P..^. ..V
C7 28 85 7B  09 51 66 D4  79 01 FE 93  32 77 79 4E   .(.{.Qf.y...2wyN
42 1C 80 F6  91 41 D5 58  EB 30 CF 2D  04 00 02 C0   B....A.X.0.-....
A8 01 00                                             ...
[lwm2m_step:381] timeoutP: 5
[lwm2m_step:386] State: STATE_REGISTERING
[registration_getStatus:1082] State: STATE_REGISTERING
[registration_getStatus:1089] 123 status: STATE_REG_PENDING
[registration_getStatus:1113] reg_status: STATE_REG_PENDING
[observe_step:521] Entering
[registration_step:2045] State: STATE_REGISTERING
[transaction_step:446] Entering
[lwm2m_step:488] Final timeoutP: 2
[lwm2m_step:490] Final state: STATE_REGISTERING
 -> State: STATE_REGISTERING
120 bytes received from [23.97.187.154]:5684
16 FE FD 00  00 00 00 00  00 00 01 00  52 02 00 00   ............R...
46 00 01 00  00 00 00 00  46 FE FD 60  81 9D 3E 16   F.......F..`..>.
D1 9E 32 E4  EF F0 34 1A  88 95 7B 22  D4 A1 6C 4B   ..2...4...{"..lK
6D 63 91 99  91 1A 84 72  82 70 D6 20  B9 DB 88 C0   mc.....r.p. ....
30 2C 36 DE  42 88 0A AF  79 3F BD DC  B5 E8 14 29   0,6.B...y?.....)
86 D8 CC E0  C6 8D 74 25  3F 0C 6E 79  C0 A8 00 16   ......t%?.ny....
FE FD 00 00  00 00 00 00  00 02 00 0C  0E 00 00 00   ................
00 02 00 00  00 00 00 00                             ........
[lwm2m_data_new:160] size: 1
[lwm2m_data_encode_opaque:251] length: 8
[lwm2m_data_free:178] size: 1
Sending 35 bytes to [23.97.187.154]:5684
16 FE FD 00  00 00 00 00  00 00 02 00  16 10 00 00   ................
0A 00 02 00  00 00 00 00  0A 00 08 74  65 73 74 2D   ...........test-
6B 65 79                                             key
[lwm2m_data_new:160] size: 1
[lwm2m_data_encode_opaque:251] length: 4
[lwm2m_data_free:178] size: 1
Sending 14 bytes to [23.97.187.154]:5684
14 FE FD 00  00 00 00 00  00 00 03 00  01 01  ..............
Sending 53 bytes to [23.97.187.154]:5684
16 FE FD 00  01 00 00 00  00 00 00 00  28 00 01 00   ............(...
00 00 00 00  00 DA 08 4D  C6 6F 51 24  D4 1E B3 4F   .......M.oQ$...O
CD D0 13 FD  DA 75 78 77  E8 83 B9 19  9A 80 CE CC   .....uxw........
2F D1 8E AC  4D                                      /...M
[lwm2m_step:381] timeoutP: 5
[lwm2m_step:386] State: STATE_REGISTERING
[registration_getStatus:1082] State: STATE_REGISTERING
[registration_getStatus:1089] 123 status: STATE_REG_PENDING
[registration_getStatus:1113] reg_status: STATE_REG_PENDING
[observe_step:521] Entering
[registration_step:2045] State: STATE_REGISTERING
[transaction_step:446] Entering
[lwm2m_step:488] Final timeoutP: 2
[lwm2m_step:490] Final state: STATE_REGISTERING
 -> State: STATE_REGISTERING
67 bytes received from [23.97.187.154]:5684
14 FE FD 00  00 00 00 00  00 00 03 00  01 01 16 FE   ................
FD 00 01 00  00 00 00 00  00 00 28 00  01 00 00 00   ..........(.....
00 00 00 49  9E 61 F1 4B  46 66 6A 48  DC BD 6A 31   ...I.a.KFfjH..j1
52 5D D8 CE  51 D3 52 BE  6B D0 0D 27  28 B3 27 E1   R]..Q.R.k..'(.'.
25 F5 E6                                             %..
decrypt_verify(): found 24 bytes cleartext
[lwm2m_step:381] timeoutP: 5
[lwm2m_step:386] State: STATE_REGISTERING
[registration_getStatus:1082] State: STATE_REGISTERING
[registration_getStatus:1089] 123 status: STATE_REG_PENDING
[registration_getStatus:1113] reg_status: STATE_REG_PENDING
[observe_step:521] Entering
[registration_step:2045] State: STATE_REGISTERING
[transaction_step:446] Entering
[lwm2m_step:488] Final timeoutP: 2
[lwm2m_step:490] Final state: STATE_REGISTERING
 -> State: STATE_REGISTERING
[lwm2m_step:381] timeoutP: 5
[lwm2m_step:386] State: STATE_REGISTERING
[registration_getStatus:1082] State: STATE_REGISTERING
[registration_getStatus:1089] 123 status: STATE_REG_PENDING
[registration_getStatus:1113] reg_status: STATE_REG_PENDING
[observe_step:521] Entering
[registration_step:2045] State: STATE_REGISTERING
[transaction_step:446] Entering
[transaction_send:359] Entering: transaction=0x8052520
Sending 211 bytes to [23.97.187.154]:5684
17 FE FD 00  01 00 00 00  00 00 01 00  C6 00 01 00   ................
00 00 00 00  01 8E A0 12  62 47 3D BA  9B 1C ED BA   ........bG=.....
50 9F 37 8B  0D 40 09 EA  7E 46 CD 84  2D 72 A8 C6   P.7..@..~F..-r..
2E 0C 1F 7C  C6 1F 7E 5A  7C 4D AB F4  0A 53 C5 9F   ...|..~Z|M...S..
37 2E DE D6  D8 38 DF A9  A3 19 ED BA  16 AA 7E E0   7....8........~.
66 72 FA 80  AD 1E 36 66  2E 8E C6 DB  90 2F 90 20   fr....6f...../. 
AC 84 76 F5  7D 3F 12 15  25 84 C7 DB  80 8F CE EC   ..v.}?..%.......
AA 45 0F 74  9F 80 07 BA  C1 B9 55 DF  7B 66 4B 9E   .E.t......U.{fK.
07 2E C8 88  33 9A 4A F4  86 6F 23 29  44 0D C2 72   ....3.J..o#)D..r
DD D3 79 1A  D1 C0 14 04  EC 5E D2 CC  1D 35 FB 6B   ..y......^...5.k
D6 DB 69 CD  0A 57 65 77  B4 E0 DD 17  AA 93 D8 3A   ..i..Wew.......:
EF 44 DE 0B  B9 A5 57 EF  43 B5 88 03  FE 9C DA 79   .D....W.C......y
B6 D3 5F DC  69 29 5D C9  CF 0F 03 5F  FA B2 E7 C1   .._.i)]...._....
2A 6D 84                                             *m.
[lwm2m_step:488] Final timeoutP: 4
[lwm2m_step:490] Final state: STATE_REGISTERING
 -> State: STATE_REGISTERING
40 bytes received from [23.97.187.154]:5684
17 FE FD 00  01 00 00 00  00 00 01 00  1B 00 01 00   ................
00 00 00 00  01 A6 FB FC  16 6A 4C 0D  8E 94 B9 4F   .........jL....O
1F B5 9E 2F  65 67 5E B9                             .../eg^.
decrypt_verify(): found 11 bytes cleartext
[lwm2m_handle_packet:444] Entering
[lwm2m_handle_packet:448] Parsed: ver 1, type 2, tkl 4, code 2.31, mid 63960, Content type: 0
[lwm2m_handle_packet:450] Payload: 

Program received signal SIGSEGV, Segmentation fault.
0x0000000008014cd9 in prv_get_transaction (contextP=0x0, sessionH=0x8054220, mid=63960) at /home/jonathan/LocalDocs/wakaama/core/packet.c:195
195         transaction = contextP->transactionList;
(gdb) 

As you can see contextP is null. The issue is that data.lwm2mH at the top level is set to NULL in DTLS mode when it should be set to the lwm2m handle.

Edit: patch removed

[rettichschnidi]

Welcome and thanks for your contribution!

However, we can not take contributions this way as we need to ensure that each contributor has agreed on the Eclipse Contributor Agreement.

Can you please create a PR using this patch?

[tuve]

Welcome @jonathanpallant as @rettichschnidi mentioned we need a signed ECA.

Since we are lacking any decent "how to contribute" documentation, here is the quick crash course on how to contribute:

1, Sign the ECA
2, When you commit the patch to your forked repository, don't forget to sign the commit, all commits in a pull request mist be signed.
git commit --signoff --message "commit message" or git commit -s -m "commit message"

If you have any questions please let us know

[rettichschnidi]

2, When you commit the patch to your forked repository, don't forget to sign the commit, all commits in a pull request mist be signed.
git commit --signoff --message "commit message" or git commit -s -m "commit message"

As learned via PR #590: The Signed-off-by is not longer required by eclipse foundation.

[tuve]

I missed that, then even simpler

[sbernard31]

(I added a comment about contribution guide to dedicated issue : #491 (comment))

[rettichschnidi]

@jonathanpallant This should be resolved by #647. Any chance you could give it a try?

[jonathanpallant]

Sorry, I haven't looked at wakaama in ages - I don't even work for the same company any more.