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bug#39800: gnutls guile bug receiving https data

From: Andy Wingo
Subject: bug#39800: gnutls guile bug receiving https data
Date: Tue, 03 Mar 2020 21:51:47 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)

Thanks very much for the report!

I think this one may be a good one for Ludovic, if I may be so bold.
Apologies for the top-post but I couldn't clip your excellent report.



"address@hidden" <address@hidden> writes:

> Hello,
> I installed gnutls for guile and checked the gnutls module with this
> simple code:
> ;;Guile version 3.0 and gnutls  from git
> ,show version
> GNU Guile
> (gnutls-version)
> $6 = "3.6.12"
> ;;Now, submitting this simple https request, you get an exception
> (http-request "https://www.google.com";)
> ice-9/boot-9.scm:1669:16: In procedure raise-exception:
> Throw to key `gnutls-error' with args `(#<gnutls-error-enum La
> connessione TLS non è stata terminata in modo corretto.>
> read_from_session_record_port)'.
> ;;instead, without https there are no errors
> (http-request "http://www.google.com";) ;;works fine.
> The error happens only on https://www.google.com and does not throw with
> a lot of other https web sites.
> Furthermore the error is not throw if the method is HEAD, so it is
> related to the data part of the https answer.
> I tried to enter in the internal implementation of the http web client
> but after some tests I decided to do some simple tests at application
> level.
> I rewrote the get-bytevector-all, with a loop that reads one byte per
> time and the error was thrown anyway.
> I catched the error and I've got the complete answer from the google web
> server.
> In the following there is my applicative solution, where I rewrote the
> get-bytevector-all by adding the error checking and specifiyng to
> http-request that the data has to be returned as a port (#:streaming?
> #t).
> ;;A macro to catch errors
> (define-syntax my-noerr
>   (syntax-rules ()
>     ((_ __error-return exp ...)
>      (let
>          ((__st #f))
>        (catch #t
>          (lambda() exp ...)
>          (lambda (k . p) __error-return))))))
> ;;The rewriting of get-bytevector-all
> (defun get-bytevector-all (port)
>   (u8-list->bytevector (let loop ((port port))
>      (let ((v (my-noerr (eof-object) (get-u8 port))))
>        (if (eof-object? v)
>        #nil
>        (cons v (loop port)))))))
> ;;the piece of code that now gives the correct result
>   (let-values (((a b)(http-request "https://www.google.com"; #:streaming?
> #t)))
>     (bytevector->string (get-bytevector-all b) "ISO-8859-1"))
> As conclusion I can say that web modules read correctly the http answers
> and, with some (one for me, the google web site) https sites there is a
> misinterpretation of EOF in the layer between http and https.
> Franco.

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