| --- Log opened Thu Jul 04 00:00:32 2013 |
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| 02:08 | <&ToxicFrog> | Design question |
| 02:09 | <&ToxicFrog> | How should vstruct handle attempts to seek beyond the start/end of the buffer? |
| 02:09 | <&Derakon> | What is vstruct? |
| 02:10 | <&ToxicFrog> | Struct (un)packing library, a la python's "struct" |
| 02:11 | <&ToxicFrog> | It has operators for relative and absolute seeks. |
| 02:12 | <&ToxicFrog> | It looks like fseek() will cheerfully let you seek past EOF, but will error if you try to seek past the start of the file. |
| 02:14 | < RichyB> | seek()ing past EOF is allowed pretty much specifically for the sake of causing the allocation of sparse files |
| 02:15 | <&ToxicFrog> | ...which doesn't make a lot of sense when the file is opened read-only. |
| 02:15 | < RichyB> | Maybe there are other reasons, but I don't know of them. |
| 02:15 | < RichyB> | Is a vstruct is a view on a fixed-size-at-allocation blob of memory? |
| 02:16 | <&ToxicFrog> | I mean, as a practical matter, when writing this will get you a sparse file and when reading it will error anyways when you try to fread() and get EOF |
| 02:16 | < RichyB> | Is a vstruct a view on a growing-as-you-append-to-it region of memory? |
| 02:16 | <&ToxicFrog> | Depends on how you use it. |
| 02:16 | <&ToxicFrog> | It can use anything that supports the stdio interface; it can also support strings, which it will automatically wrap in a stdio interface and grow as needed |
| 02:16 | < RichyB> | Well, if it's fixed-size like a bytes[] then it attempts to seek past the end are just bounds exceptions. |
| 02:17 | < RichyB> | If it's a thing that's going to feel like a StringIO or StringBuilder or whatever, then seeking past the end is a way of extending the buffer right now, and kindly fill the gap with nulls. |
| 02:18 | < RichyB> | So the latter, I think. |
| 02:18 | <&ToxicFrog> | Hmm. |
| 02:18 | < RichyB> | You could imagine something like an assembler or linker that, hitting a .offset declaration, seek()s to the named address and starts writing bytes from there. |
| 02:18 | <&ToxicFrog> | Looking at cursor(), it mimics the stdio behaviour (reads past eof return eof, writes past eof extend the buffer, seeks to <0 soft error) |
| 02:19 | <&ToxicFrog> | So I think the only actual question here is "should a seek to <0 be a hard error", and I think the answer is yes |
| 02:19 | < RichyB> | I think you're right to extend the buffer on writes past eof. |
| 02:19 | <&ToxicFrog> | Otherwise everything after the bad seek is garbage data anyways. |
| 02:19 | < RichyB> | I agree with you there, too. |
| 02:19 | <&ToxicFrog> | (and probably something before it, or you wouldn't attempt it in the first place...) |
| 02:19 | < RichyB> | :) |
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| 02:22 | <&ToxicFrog> | (I am finally getting around to writing the unit tests for error handling) |
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| 16:23 | <&ToxicFrog> | Good: having comprehensive test coverage. |
| 16:23 | <&ToxicFrog> | Better: refactoring the parser. |
| 16:23 | <&ToxicFrog> | Best: all tests pass afterwards. |
| 16:26 | <@Azash> | https://blog.crypto.cat/2013/07/new-critical-vulnerability-in-cryptocat-details/ http://tobtu.com/decryptocat.php |
| 16:27 | <@Azash> | ToxicFrog: Woo \o/ |
| 16:53 | < Xon> | ToxicFrog, I'm still trying to get people todo this new fangled thing called testing for one fo the new projects I've been working on. =\ |
| 16:54 | < Xon> | some of the ideas of my coworkers have suggested for the enviroment this project is going into also make me want to cry too. Microsoft's NLB. hardcoded IPs in config files, etc. |
| 16:58 | <@Tamber> | Azash, "Crypto is hard, let's go shopping" |
| 16:59 | <@Tamber> | (Otherwise known as "Why I don't even *try* to fuck about with anything that involves crypto at some point, because I *will* get it wrong.") |
| 17:04 | <@Azash> | Tamber: Pretty much, but I suppose in practice most of it is "be less wrong than the rest" :P |
| 17:04 | <@Tamber> | *chuckle* |
| 17:14 | <&ToxicFrog> | Xon: this is a project where someone filed a dozen bugs against it and, as an appendix, the 1200-line dynamic test case generator they had used to expose the bugs. (At the time, that was as large as the rest of the project combined; it still accounts for a third of it by LOC) |
| 17:14 | <&ToxicFrog> | It is probably my single most well tested project after stuff I work on professionally. |
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| 17:20 | <@gnolam> | https://twitter.com/raganwald/status/352089641073127426 :D |
| 17:34 | <@froztbyte> | Azash: my favourite part of that was "Cryptocat is run by people that don't know crypto, make stupid mistakes, and not enough eyes are looking at their code to find the bugs." |
| 17:35 | <@froztbyte> | which is pretty much the exact feeling that I got from /just the praise cryptocat got/ |
| 17:35 | < Syka> | wait |
| 17:35 | < Syka> | i thought cryptocat was by appelbaum |
| 17:35 | < Syka> | or did he do another crypto-chat service after tor |
| 17:36 | <@froztbyte> | wikipedia mentions nothing of appelbaum in relation to cryptocat |
| 17:36 | <@froztbyte> | (not an empirical test, sure, but it's good enough for informational) |
| 17:37 | < Syka> | hmm |
| 17:37 | < Syka> | maybe he just mentioned it in that 29c3 talk then, don't remember |
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| --- Log closed Fri Jul 05 00:00:47 2013 |