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Issue 180107: Chord/DHash support in ns-3

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Created:
14 years, 3 months ago by harjotgill
Modified:
13 years, 1 month ago
CC:
ns-3-reviews_googlegroups.com, harjotgill, boonloo_cis.upenn.edu
Visibility:
Public.

Patch Set 1 #

Total comments: 89
Unified diffs Side-by-side diffs Delta from patch set Stats (+9537 lines, -0 lines) Patch
A examples/chord-run/chord-run.cc View 1 chunk +765 lines, -0 lines 1 comment Download
A examples/chord-run/chord-test-script View 1 chunk +111 lines, -0 lines 0 comments Download
A examples/chord-run/waf View 1 chunk +1 line, -0 lines 0 comments Download
A examples/chord-run/wscript View 1 chunk +6 lines, -0 lines 0 comments Download
A src/applications/chord-ipv4/AUTHORS View 1 chunk +9 lines, -0 lines 1 comment Download
A src/applications/chord-ipv4/chord-identifier.h View 1 chunk +163 lines, -0 lines 18 comments Download
A src/applications/chord-ipv4/chord-identifier.cc View 1 chunk +351 lines, -0 lines 0 comments Download
A src/applications/chord-ipv4/chord-ipv4.h View 1 chunk +405 lines, -0 lines 3 comments Download
A src/applications/chord-ipv4/chord-ipv4.cc View 1 chunk +1588 lines, -0 lines 10 comments Download
A src/applications/chord-ipv4/chord-message.h View 1 chunk +674 lines, -0 lines 4 comments Download
A src/applications/chord-ipv4/chord-message.cc View 1 chunk +737 lines, -0 lines 0 comments Download
A src/applications/chord-ipv4/chord-node.h View 1 chunk +176 lines, -0 lines 6 comments Download
A src/applications/chord-ipv4/chord-node.cc View 1 chunk +188 lines, -0 lines 0 comments Download
A src/applications/chord-ipv4/chord-node-table.h View 1 chunk +126 lines, -0 lines 14 comments Download
A src/applications/chord-ipv4/chord-node-table.cc View 1 chunk +265 lines, -0 lines 4 comments Download
A src/applications/chord-ipv4/chord-transaction.h View 1 chunk +145 lines, -0 lines 2 comments Download
A src/applications/chord-ipv4/chord-transaction.cc View 1 chunk +138 lines, -0 lines 0 comments Download
A src/applications/chord-ipv4/chord-vnode.h View 1 chunk +295 lines, -0 lines 5 comments Download
A src/applications/chord-ipv4/chord-vnode.cc View 1 chunk +517 lines, -0 lines 0 comments Download
A src/applications/chord-ipv4/dhash-connection.h View 1 chunk +164 lines, -0 lines 0 comments Download
A src/applications/chord-ipv4/dhash-connection.cc View 1 chunk +267 lines, -0 lines 0 comments Download
A src/applications/chord-ipv4/dhash-ipv4.h View 1 chunk +214 lines, -0 lines 1 comment Download
A src/applications/chord-ipv4/dhash-ipv4.cc View 1 chunk +751 lines, -0 lines 6 comments Download
A src/applications/chord-ipv4/dhash-message.h View 1 chunk +358 lines, -0 lines 6 comments Download
A src/applications/chord-ipv4/dhash-message.cc View 1 chunk +353 lines, -0 lines 0 comments Download
A src/applications/chord-ipv4/dhash-object.h View 1 chunk +126 lines, -0 lines 2 comments Download
A src/applications/chord-ipv4/dhash-object.cc View 1 chunk +190 lines, -0 lines 4 comments Download
A src/applications/chord-ipv4/dhash-transaction.h View 1 chunk +109 lines, -0 lines 2 comments Download
A src/applications/chord-ipv4/dhash-transaction.cc View 1 chunk +94 lines, -0 lines 0 comments Download
A src/applications/chord-ipv4/wscript View 1 chunk +35 lines, -0 lines 0 comments Download
A src/helper/chord-ipv4-helper.h View 1 chunk +117 lines, -0 lines 0 comments Download
A src/helper/chord-ipv4-helper.cc View 1 chunk +96 lines, -0 lines 0 comments Download
M src/helper/wscript View 2 chunks +2 lines, -0 lines 0 comments Download
M src/wscript View 1 chunk +1 line, -0 lines 0 comments Download

Messages

Total messages: 5
Mathieu Lacage
hi, A couple of high-level comments: - coding style: gustavo pointed it out already: you ...
14 years, 2 months ago (2010-01-13 12:51:12 UTC) #1
harjotgill
Thanks for reviewing our code. I am working on your suggestions and will post a ...
14 years, 2 months ago (2010-01-16 17:01:08 UTC) #2
Tom Henderson
Sorry for the delay in reviewing; thanks for submitting to ns-3. I would like to ...
14 years, 2 months ago (2010-01-18 07:32:18 UTC) #3
taher007saeed
Dear all, Thanks Mathieu/Gustavo/Tom for reviewing our code. We have incorporated several suggestions, please visit ...
14 years, 2 months ago (2010-01-24 20:47:01 UTC) #4
Gnomff
13 years, 1 month ago (2011-02-14 00:21:40 UTC) #5
Hello,

I downloaded and installed this Chord application into my ns-3.10 installation,
and I have to say it's excellent. However, I was experiencing some intermittent
crashes while running the test script. An example error message:

Scheduling Command InsertVNode...
*** glibc detected ***
/home/tim/workspace/ns-3-allinone/ns-3.10/build/debug/examples/chord-run/chord-run:
munmap_chunk(): invalid pointer: 0x0868c0c0 ***

After some tinkering I began to expect that the stack was being corrupted. I saw
that in ChordIdentifier, the m_key buffer is not null terminated. It worried me
because GetKey exposes the pointer and is used in user-defined callbacks. You
never know when a silly user is going to use a function that expects a null
terminated string. I created the function

uint8_t *
ChordIdentifier::AllocateBuffer(uint8_t numBytes)
{
	uint8_t * keybuf = (uint8_t *) malloc((numBytes * sizeof (uint8_t)) +1);
	memset(keybuf, 0, numBytes +1);
	return keybuf;
}

to replace all the calls to malloc in ChordIdentifier to make sure m_key is
always null terminated. Since my alteration I haven't seen any more crashes,
although I'm still baffled about where in the code the stack is being corrupted.
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