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download: Do not leak file descriptors on TLS ports. 

Fixes <https://bugs.gnu.org/20145>.

* guix/build/download.scm (%tls-ports, register-tls-record-port): Remove.
(tls-wrap): Remove call to 'register-tls-record-port'.  Return a custom
binary input/output port instead.  This is a backport of what Guile
2.2's (web client) module has been doing.
(close-connection): Define as an alias for 'close-port'.
* guix/http-client.scm (http-fetch): Remove #:keep-alive? parameter,
which was ignored and unused.
Pass #:keep-alive? #f to 'http-get'.
* guix/lint.scm (probe-uri): Use 'close-port' instead of 'close-connection'.
* guix/scripts/substitute.scm (http-multiple-get): Likewise.
This commit is contained in:
Ludovic Courtès 2020-01-03 15:47:12 +01:00
parent 52207b3938
commit f4cde9ac4a
No known key found for this signature in database
GPG Key ID: 090B11993D9AEBB5
4 changed files with 50 additions and 41 deletions
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62
guix/build/download.scm
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@ -28,6 +28,7 @@
#:use-module (guix build utils)
#:use-module (guix progress)
#:use-module (rnrs io ports)
#:use-module ((ice-9 binary-ports) #:select (unget-bytevector))
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
@ -160,15 +161,6 @@ out if the connection could not be established in less than TIMEOUT seconds."
'(gnutls)
'(make-session connection-end/client))
(define %tls-ports
;; Mapping of session record ports to the underlying file port.
(make-weak-key-hash-table))
(define (register-tls-record-port record-port port)
"Hold a weak reference from RECORD-PORT to PORT, where RECORD-PORT is a TLS
session record port using PORT as its underlying communication port."
(hashq-set! %tls-ports record-port port))
(define %x509-certificate-directory
;; The directory where X.509 authority PEM certificates are stored.
(make-parameter (or (getenv "GUIX_TLS_CERTIFICATE_DIRECTORY")
@ -311,17 +303,40 @@ host name without trailing dot."
(apply throw args))))
(let ((record (session-record-port session)))
;; Since we use `fileno' above, the file descriptor behind PORT would be
;; closed when PORT is GC'd. If we used `port->fdes', it would instead
;; never be closed. So we use `fileno', but keep a weak reference to
;; PORT, so the file descriptor gets closed when RECORD is GC'd.
(register-tls-record-port record port)
(define (read! bv start count)
(define read-bv (get-bytevector-some record))
(if (eof-object? read-bv)
0 ; read! returns 0 on eof-object
(let ((read-bv-len (bytevector-length read-bv)))
(bytevector-copy! read-bv 0 bv start (min read-bv-len count))
(when (< count read-bv-len)
(unget-bytevector record bv count (- read-bv-len count)))
read-bv-len)))
(define (write! bv start count)
(put-bytevector record bv start count)
(force-output record)
count)
(define (get-position)
(port-position record))
(define (set-position! new-position)
(set-port-position! record new-position))
(define (close)
(unless (port-closed? port)
(close-port port))
(unless (port-closed? record)
(close-port record)))
;; Write HTTP requests line by line rather than byte by byte:
;; <https://bugs.gnu.org/22966>. This is possible with Guile >= 2.2.
(setvbuf record 'line)
(setvbuf record 'block)
record)))
;; Return a port that wraps RECORD to ensure that closing it also
;; closes PORT, the actual socket port, and its file descriptor.
;; XXX: This wrapper would be unnecessary if GnuTLS could
;; automatically close SESSION's file descriptor when RECORD is
;; closed, but that doesn't seem to be possible currently (as of
;; 3.6.9).
(make-custom-binary-input/output-port "gnutls wrapped port" read! write!
get-position set-position!
close))))
(define (ensure-uri uri-or-string) ;XXX: copied from (web http)
(cond
@ -429,16 +444,9 @@ VERIFY-CERTIFICATE? is true, verify HTTPS server certificates."
#:verify-certificate? verify-certificate?)
s)))))
(define (close-connection port)
"Like 'close-port', but (1) idempotent, and (2) also closes the underlying
port if PORT is a TLS session record port."
;; FIXME: This is a partial workaround for <http://bugs.gnu.org/20145>,
;; because 'http-fetch' & co. may return a chunked input port whose 'close'
;; method calls 'close-port', not 'close-connection'.
(define (close-connection port) ;deprecated
(unless (port-closed? port)
(close-port port))
(and=> (hashq-ref %tls-ports port)
close-connection))
(close-port port)))
;; XXX: This is an awful hack to make sure the (set-port-encoding! p
;; "ISO-8859-1") call in `read-response' passes, even during bootstrap

13
guix/http-client.scm
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@ -70,14 +70,13 @@
(define* (http-fetch uri #:key port (text? #f) (buffered? #t)
keep-alive? (verify-certificate? #t)
(verify-certificate? #t)
(headers '((user-agent . "GNU Guile"))))
"Return an input port containing the data at URI, and the expected number of
bytes available or #f. If TEXT? is true, the data at URI is considered to be
textual. Follow any HTTP redirection. When BUFFERED? is #f, return an
unbuffered port, suitable for use in `filtered-port'. When KEEP-ALIVE? is
true, send a 'Connection: keep-alive' HTTP header, in which case PORT may be
reused for future HTTP requests. HEADERS is an alist of extra HTTP headers.
unbuffered port, suitable for use in `filtered-port'. HEADERS is an alist of
extra HTTP headers.
When VERIFY-CERTIFICATE? is true, verify HTTPS server certificates.
@ -100,7 +99,11 @@ Raise an '&http-get-error' condition if downloading fails."
(setvbuf port 'none))
(let*-values (((resp data)
(http-get uri #:streaming? #t #:port port
#:keep-alive? #t
;; XXX: When #:keep-alive? is true, if DATA is
;; a chunked-encoding port, closing DATA won't
;; close PORT, leading to a file descriptor
;; leak.
#:keep-alive? #f
#:headers headers))
((code)
(response-code resp)))

9
guix/lint.scm
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@ -1,7 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 Cyril Roelandt <tipecaml@gmail.com>
;;; Copyright © 2014, 2015 Eric Bavier <bavier@member.fsf.org>
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015, 2016 Mathieu Lirzin <mthl@gnu.org>
;;; Copyright © 2016 Danny Milosavljevic <dannym+a@scratchpost.org>
;;; Copyright © 2016 Hartmut Goebel <h.goebel@crazy-compilers.com>
@ -26,7 +26,7 @@
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix lint)
#:use-module ((guix store) #:hide (close-connection))
#:use-module (guix store)
#:use-module (guix base32)
#:use-module (guix diagnostics)
#:use-module (guix download)
@ -54,8 +54,7 @@
#:use-module ((guix build download)
#:select (maybe-expand-mirrors
(open-connection-for-uri
. guix:open-connection-for-uri)
close-connection))
. guix:open-connection-for-uri)))
#:use-module (web request)
#:use-module (web response)
#:use-module (srfi srfi-1)
@ -453,7 +452,7 @@ for connections to complete; when TIMEOUT is #f, wait as long as needed."
(force-output port)
(read-response port))
(lambda ()
(close-connection port))))
(close-port port))))
(case (response-code response)
((302 ; found (redirection)

7
guix/scripts/substitute.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014 Nikita Karetnikov <nikita@karetnikov.org>
;;; Copyright © 2018 Kyle Meyer <kyle@kyleam.com>
;;;
@ -20,7 +20,7 @@
(define-module (guix scripts substitute)
#:use-module (guix ui)
#:use-module ((guix store) #:hide (close-connection))
#:use-module (guix store)
#:use-module (guix utils)
#:use-module (guix combinators)
#:use-module (guix config)
@ -37,7 +37,6 @@
#:select (uri-abbreviation nar-uri-abbreviation
(open-connection-for-uri
. guix:open-connection-for-uri)
close-connection
store-path-abbreviation byte-count->string))
#:use-module (guix progress)
#:use-module ((guix build syscalls)
@ -556,7 +555,7 @@ initial connection on which HTTP requests are sent."
;; Note that even upon "Connection: close", we can read from BODY.
(match (assq 'connection (response-headers resp))
(('connection 'close)
(close-connection p)
(close-port p)
(connect #f ;try again
(append tail (drop requests processed))
result))