Bug #3294: Interest::getNonce and Name::compare fail on big endian platforms - ndn-cxx - NDN project issue tracking system

Bug #3294

closed

Interest::getNonce and Name::compare fail on big endian platforms

Added by susmit shannigrahi over 8 years ago. Updated about 4 years ago.

Status:

Closed

Priority:

Normal

Assignee:

Davide Pesavento

Category:

Base

Target version:

0.8.0

Start date:

Due date:

% Done:

100%

Estimated time:

Description

ndn-cxx tests fail on big endian machines like s390(x) or ppc64

https://bugzilla.redhat.com/show_bug.cgi?id=1275619

Buildlogs:

http://ppc.koji.fedoraproject.org/koji/taskinfo?taskID=2833893

http://s390.koji.fedoraproject.org/koji/taskinfo?taskID=1971883

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Updated by Junxiao Shi over 8 years ago

Subject changed from ndn-cxx tests fail on big endian machines like s390(x) or ppc64 to Interest::getNonce and Name::compare fail on big endian
Description updated (diff)
Category set to Base
Target version set to Unsupported

Fedora is not a supported platform, although I believe this bug would also appear on Ubuntu which has ppc64 releases.

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Updated by Davide Pesavento over 8 years ago

Subject changed from Interest::getNonce and Name::compare fail on big endian to Interest::getNonce and Name::compare fail on big endian platforms

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Updated by Davide Pesavento over 8 years ago

The failures in Name::compare tests might not be endianness bugs, but could be due to incorrect assumptions regarding memcmp() return value, see also https://github.com/named-data/ndn-cxx/pull/3

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Updated by susmit shannigrahi over 8 years ago

Davide Pesavento wrote:
The failures in Name::compare tests might not be endianness bugs, but could be due to incorrect assumptions regarding memcmp() return value, see also https://github.com/named-data/ndn-cxx/pull/3

This is still happening in 0.4.0. I thought we fixed it, no?

https://kojipkgs.fedoraproject.org//work/tasks/4228/12494228/build.log

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Updated by Davide Pesavento over 8 years ago

susmit shannigrahi wrote:

This is still happening in 0.4.0. I thought we fixed it, no?

Uhm no... we fixed Name::compare, but there are other failures in your report, probably endian-related, and I don't think anyone tried to fix those.

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Updated by susmit shannigrahi over 8 years ago

Davide Pesavento wrote:
Uhm no... we fixed Name::compare, but there are other failures in your report, probably endian-related, and I don't think anyone tried to fix those.

tlv.hpp uses be16toh, be32toh and be64toh before returning values. The test compares 1U to the returned value. There is a conversion mismatch somewhere.

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Updated by susmit shannigrahi over 8 years ago

Adding the bugzilla bug here:

https://bugzilla.redhat.com/show_bug.cgi?id=1297894

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Updated by Davide Pesavento over 4 years ago

% Done changed from 0 to 50

I don't see what's wrong with getNonce, there's nothing endian-specific there. However, decoding of the nonce field may be wrong, the code only does a memcpy but no endian-swap.
A related question is why are we using uint32_t to represent the nonce instead of uint8_t[4]?

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