BNER support stubs #247

ringlej · 2017-11-19T01:32:36Z

This PR will add stubs in for BACnet Encoding Rules to reduce merge conflicts while developing the BNER encoding

coveralls · 2017-11-19T03:39:53Z

Coverage decreased (-0.04%) to 71.147% when pulling 410649e on ringlej:feature/bner-support into da672c4 on vlm:master.

coveralls · 2017-11-19T04:22:20Z

Coverage decreased (-0.04%) to 71.147% when pulling 7378fa5 on ringlej:feature/bner-support into da672c4 on vlm:master.

coveralls · 2017-11-19T04:54:41Z

Coverage decreased (-0.04%) to 71.147% when pulling 25110a0 on ringlej:feature/bner-support into da672c4 on vlm:master.

coveralls · 2017-11-19T05:17:23Z

Coverage decreased (-0.05%) to 71.135% when pulling 25110a0 on ringlej:feature/bner-support into da672c4 on vlm:master.

coveralls · 2017-11-19T05:32:56Z

Coverage decreased (-0.05%) to 71.135% when pulling dae3e5c on ringlej:feature/bner-support into da672c4 on vlm:master.

coveralls · 2017-11-19T05:51:58Z

Coverage decreased (-0.05%) to 71.135% when pulling dae3e5c on ringlej:feature/bner-support into da672c4 on vlm:master.

coveralls · 2017-11-19T06:03:40Z

Coverage decreased (-0.05%) to 71.135% when pulling abc770b on ringlej:feature/bner-support into da672c4 on vlm:master.

coveralls · 2017-11-19T13:46:02Z

Coverage decreased (-0.05%) to 71.135% when pulling 72ed265 on ringlej:feature/bner-support into da672c4 on vlm:master.

coveralls · 2017-11-20T03:20:03Z

Coverage decreased (-0.05%) to 71.135% when pulling e271d55 on ringlej:feature/bner-support into da672c4 on vlm:master.

coveralls · 2017-11-20T18:43:18Z

Coverage decreased (-0.05%) to 71.135% when pulling e7474f7 on ringlej:feature/bner-support into da672c4 on vlm:master.

ringlej · 2017-11-21T06:40:02Z

@vlm I create a branch on my fork feature/bner-support-WIP that builds on top of this PR:
https://github.com/ringlej/asn1c/commits/feature/bner-support-WIP

Once you've reviewed and merged this PR, I'll start creating other PR based on the work on the feature/bner-support-WIP branch.

Here is a link to compare your master against my feature/bner-support-WIP:
master...ringlej:feature/bner-support-WIP

vlm · 2017-11-21T08:57:50Z

Please adjust the first license line to

Copyright (c) 2003-2017  Lev Walkin <[email protected]> and contributors.

(the contributors are properly listed in the AUTHORS file).

Please use ASN_DISABLE_BNER_SUPPORT instead of ASN_ENABLE_BNER_SUPPORT, just don't enable it by default in asn1c/asn1c.c. This is a hard-ish decision, but I think it is better this way, since ti makes the code uniform.

ringlej · 2017-11-21T16:21:09Z

skeletons/bner_support.c

+
+    ber_tlv_tag_t bner_tag;
+
+    if(ber_tag == -1) return -1; /* ANY */


@vlm
I have this check here because an asn1 rule like this:

BACnetTimeValue ::= SEQUENCE { time Time, value ABSTRACT-SYNTAX.&Type -- any primitive datatype; complex types cannot be decoded }

will produce code like this:

asn_TYPE_member_t asn_MBR_BACnetTimeValue_1[] = { { ATF_NOFLAGS, 0, offsetof(struct BACnetTimeValue, time), (ASN_TAG_CLASS_APPLICATION | (11 << 2)), 0, &asn_DEF_Time, 0, { 0, 0, 0 }, 0, 0, /* No default value */ "time" }, { ATF_ANY_TYPE | ATF_NOFLAGS, 0, offsetof(struct BACnetTimeValue, value), -1 /* Ambiguous tag (ANY?) */, 0, &asn_DEF_ANY, 0, { 0, 0, 0 }, 0, 0, /* No default value */ "value" },

The line in the code above:

-1 /* Ambiguous tag (ANY?) */,

is of type ber_tlv_tag_t, which is typedef unsigned ber_tlv_tag_t

However, this line of code causes this compilation error:

bner_support.c: In function ‘convert_ber_to_bner_tag’: bner_support.c:320:16: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] if(ber_tag == -1) return -1; /* ANY */ ^

I tried changing it to typedef signed ber_tlv_tag_t, but this causes tests/tests-skeletons/check-ber_tlv_tag to fail:

$ cat tests/tests-skeletons/test-suite.log ======================================================== asn1c 0.9.29: tests/tests-skeletons/test-suite.log ======================================================== # TOTAL: 17 # PASS: 16 # SKIP: 0 # XFAIL: 0 # FAIL: 1 # XPASS: 0 # ERROR: 0 .. contents:: :depth: 2 FAIL: check-ber_tlv_tag ======================= ../../../tests/tests-skeletons/check-ber_tlv_tag.c:103:21: runtime error: left shift of negative value -294967296 #0 0x401003 in main (/home/jringle-admin/git/asn1c/.tmp.build/tests/tests-skeletons/check-ber_tlv_tag+0x401003) #1 0x2aef36a22f44 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21f44) #2 0x40115f (/home/jringle-admin/git/asn1c/.tmp.build/tests/tests-skeletons/check-ber_tlv_tag+0x40115f)

Do you have any suggestions?

It seems to me that X.690 section 8.1.2 doesn't seem to specify a maximum tag value allowed, but rather that the tag value can be arbitrarily large just by adding more subsequent identifier octets with the high order bit set. As such, it seems to me that the limit on the largest tag value would be limited by the implementation that is implementing the Basic Encoding Rules. Are there users of BER out there where you could reasonably expect that they would experience hardship if the largest BER tag value was cut in half from this implementation's max value due to changing it to typedef signed ber_tlv_tag_t?

I do not anticipate end-user problems, but it changing signedness of ber_tlv_tag_t will surely cause me going over the code base for quite some time in search of inadvertent security issues. So do it as a separate PR to make it a bit easier.

@vlm I abandoned the idea of changing it to signed and instead did 5700277 (Which is part of the latest version of this this PR)

ringlej · 2017-11-21T23:39:58Z

@vlm I must not be doing the regenerate of the test asn1 properly. I was run ./check-parsing.sh regenerate from the tests/tests-asn1c-compiler/ directory. Is there something else I need to do to fixup the tests after the e725f21 commit?

coveralls · 2017-11-22T05:55:03Z

Coverage decreased (-0.05%) to 71.072% when pulling 84c009b on ringlej:feature/bner-support into 4cc779f on vlm:master.

vlm · 2017-11-22T07:52:13Z

@brchiu I usually do it using ./check-parsing.sh regenerate and verifying result with git diff . JFYI.

ringlej · 2017-11-22T15:21:20Z

I created a separate PR #249 for the ASN_TAG_AMBIGUOUS part of this PR

coveralls · 2017-11-29T05:13:13Z

Coverage decreased (-0.05%) to 71.072% when pulling 2832076 on ringlej:feature/bner-support into 4cc779f on vlm:master.

coveralls · 2017-11-29T06:41:13Z

Coverage decreased (-0.05%) to 71.072% when pulling 8ff07d2 on ringlej:feature/bner-support into 4cc779f on vlm:master.

The BNER support in the asn1c compiler will only support the BNER variable encoding rules. The bner_{en,de}code() functions will to see if the PDU being {en,de}coded is one that requires BNER fixed encoding rules (these are "BACnet.*PDU". If it is, then it will call bner_fixed_{en,de}coder() These two functions are declared as weak functions that will return an error. The intent here is that an external project will provide replacement functions for these two functions.

coveralls · 2017-11-29T09:01:37Z

Coverage decreased (-0.1%) to 71.006% when pulling 194762f on ringlej:feature/bner-support into 4cc779f on vlm:master.

coveralls · 2017-12-01T02:58:29Z

Coverage decreased (-0.1%) to 71.006% when pulling 7c6c02f on ringlej:feature/bner-support into 4cc779f on vlm:master.

coveralls · 2017-12-01T06:06:55Z

Coverage decreased (-0.1%) to 71.006% when pulling 06e4c85 on ringlej:feature/bner-support into 4cc779f on vlm:master.

coveralls · 2017-12-01T09:03:08Z

Coverage decreased (-0.1%) to 71.006% when pulling 2788662 on ringlej:feature/bner-support into 4cc779f on vlm:master.

This will allow a bacnet library to override this function and be able to pretty print the BNER primitives: Double CharacterString Date Time BACnetObjectIdentifier

coveralls · 2017-12-01T20:19:24Z

Coverage decreased (-0.09%) to 71.031% when pulling aa62608 on ringlej:feature/bner-support into 4cc779f on vlm:master.

ringlej force-pushed the feature/bner-support branch 4 times, most recently from bc863e3 to 410649e Compare November 19, 2017 03:06

ringlej force-pushed the feature/bner-support branch from 410649e to 7378fa5 Compare November 19, 2017 04:01

ringlej changed the title ~~BNER support~~ BNER support stubs Nov 19, 2017

ringlej force-pushed the feature/bner-support branch 3 times, most recently from 493e9fc to 25110a0 Compare November 19, 2017 04:47

ringlej force-pushed the feature/bner-support branch from 25110a0 to dae3e5c Compare November 19, 2017 05:03

ringlej force-pushed the feature/bner-support branch from abc770b to 72ed265 Compare November 19, 2017 13:24

ringlej force-pushed the feature/bner-support branch from 72ed265 to e271d55 Compare November 20, 2017 02:58

ringlej force-pushed the feature/bner-support branch from e271d55 to e7474f7 Compare November 20, 2017 18:19

ringlej force-pushed the feature/bner-support branch from e7474f7 to cce5152 Compare November 21, 2017 15:20

ringlej commented Nov 21, 2017

View reviewed changes

ringlej force-pushed the feature/bner-support branch 2 times, most recently from 1c63322 to c672a2c Compare November 21, 2017 21:22

ringlej added 2 commits November 22, 2017 00:32

ber_tlv_tag_snprint: Handle printing [AMBIGUOUS] tag

43350aa

Regenerate tests-asn1c-compiler

e060632

ringlej force-pushed the feature/bner-support branch from bb4f4fa to 84c009b Compare November 22, 2017 05:33

ringlej force-pushed the feature/bner-support branch from 84c009b to 2832076 Compare November 29, 2017 04:50

ringlej added 2 commits November 29, 2017 01:17

BNER support: Add #ifdef'd bner_{de,en}coder to asn_TYPE_operations_t

d5592ea

BNER support: Add skeletons/*_bner.c with stub functions

7790229

ringlej force-pushed the feature/bner-support branch from 2832076 to 8ff07d2 Compare November 29, 2017 06:18

ringlej added 2 commits November 29, 2017 03:22

BNER support: Add bner tag {en,de}coding

16ec6b2

ringlej force-pushed the feature/bner-support branch 3 times, most recently from 698f856 to 194762f Compare November 29, 2017 08:39

ringlej added 2 commits November 30, 2017 21:35

BNER support: Add -gen-BNER option

3e69bc9

BNER support: converter-example

8ee5eed

ringlej force-pushed the feature/bner-support branch from 194762f to 7c6c02f Compare December 1, 2017 02:37

define CC_WEAK_ALIAS

4b6148e

ringlej force-pushed the feature/bner-support branch from 06e4c85 to 2788662 Compare December 1, 2017 08:40

ringlej added 2 commits December 1, 2017 14:53

BNER: Add weak function stubs for BNER fixed encoded PDUs

19e3558

BNER: Make OCTET_STRING_print a weak function

aa62608

This will allow a bacnet library to override this function and be able to pretty print the BNER primitives: Double CharacterString Date Time BACnetObjectIdentifier

ringlej force-pushed the feature/bner-support branch from 2788662 to aa62608 Compare December 1, 2017 19:55

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BNER support stubs #247

BNER support stubs #247

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		ber_tlv_tag_t bner_tag;

		if(ber_tag == -1) return -1; /* ANY */

BNER support stubs #247

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BNER support stubs #247

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