bug#45162: 28.0.50; Messages scrambled by socks-filter

[J.P.]

Severity: minor
Tags: patch

Hi,

If this is indeed a bug, I'm guessing it's a pretty minor one because in
most cases, the bulk of a SOCKS reply doesn't seem to matter, so long as
the status code portion is correctly interpreted. But in rarer cases, for
example when using Tor's RESOLVE command, which is part of a nonstandard
extension suite, a response may need to be preserved intact.

Rather than try to explain, I've included a throwaway before/after test
showing current and expected behavior, as well as a small patch that
seems to fix the issue. If this is all nonsense, please forgive me. I am
no expert, just a grateful end user.

Thanks,
J.P.

In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.23, cairo 
version 1.16.0)
 of 2020-12-09 built on pc
Repository revision: 4f352ad6f1759ae6dcff6ba43847273491bf9c30
Repository branch: socks
Windowing system distributor 'Fedora Project', version 11.0.12010000
System Description: Fedora 33 (Workstation Edition)

Configured using:
 'configure --with-dbus --with-gif --with-jpeg --with-png --with-rsvg
 --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3 --with-gpm=no
 --with-xwidgets --with-modules --with-harfbuzz --with-cairo --with-json
 CC=gcc 'CFLAGS=-DMAIL_USE_LOCKF -O0 -g3 -Wall' LDFLAGS=-Wl,-z,relro
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
LIBSYSTEMD JSON PDUMPER LCMS2

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
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  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
rfc822 mml easymenu mml-sec epa derived epg epg-config gnus-util rmail
rmail-loaddefs auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json map text-property-search time-date
subr-x seq byte-opt gv bytecomp byte-compile cconv mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs
cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
iso-transl tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page tab-bar menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame minibuffer cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads
xwidget-internal dbusbind inotify lcms2 dynamic-setting
system-font-setting font-render-setting cairo move-toolbar gtk x-toolkit
x multi-tty make-network-process emacs)

Memory information:
((conses 16 51710 8248)
 (symbols 48 6739 1)
 (strings 32 18249 1932)
 (string-bytes 1 610727)
 (vectors 16 12311)
 (vector-slots 8 170737 6932)
 (floats 8 21 45)
 (intervals 56 219 0)
 (buffers 984 10))

0001-DROP-ME-add-test-explaining-existing-bug.patch
Description: Text Data

0002-DROP-ME-update-test-to-reflect-expected-behavior.patch
Description: Text Data

0003-Append-incremental-message-segments-in-socks-filter.patch
Description: Text Data