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bug#30475: 25.3; connection-failure errors

From: Ken Raeburn
Subject: bug#30475: 25.3; connection-failure errors
Date: Thu, 15 Feb 2018 17:24:32 -0500

I'm running on a network with a broken IPv6 setup; there are router
advertisements so I get a network address and default router, but the
router can't get anywhere so I always get "no route" errors back.

If I try running rcirc to connect to freenode, I sometimes get:

  Connecting to irc.freenode.net...
  open-network-stream: Failed connect: No route to host

If I retry a few times, eventually it succeeds. At the moment,
irc.freenode.net resolves to 5 IPv4 addresses and 3 IPv6
addresses. Emacs doesn't tell me which address it's trying each time,
but I expect something is doing randomization or round-robin ordering.

1) It might be useful (for debugging, at least) if the error message
indicated the host name and, when open-network-stream is given a host
name, the actual address tried that got the error, if we're not going to
try multiple addresses.

2) If a host has multiple addresses, routing failures (or timeouts, or
probably some other failures) should cause us to try the next
address. The error on one address should probably still be displayed so
it's saved to the *Messages* buffer, but success on a second address
when the first is unreachable should still let the application code go

2a) In fact, it wouldn't be completely insane to make "Happy Eyeballs"
(RFC 8305) style staggered but parallel connection attempts when both
IPv4 and IPv6 addresses are available.

In GNU Emacs 25.3.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.22.19)
 of 2017-09-14 built on buildvm-31.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.11906000
System Description:     Fedora release 27 (Twenty Seven)

Configured using:
 'configure --build=x86_64-redhat-linux-gnu
 --host=x86_64-redhat-linux-gnu --program-prefix=
 --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
 --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
 --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
 --libexecdir=/usr/libexec --localstatedir=/var
 --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --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
 build_alias=x86_64-redhat-linux-gnu host_alias=x86_64-redhat-linux-gnu
 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g -pipe -Wall -Werror=format-security
 -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
 --param=ssp-buffer-size=4 -grecord-gcc-switches
 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic'

Configured features:

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

Major mode: rcirc

Minor modes in effect:
  buffer-face-mode: t
  diff-auto-refine-mode: t
  rcirc-track-minor-mode: t
  display-time-mode: t
  desktop-save-mode: t
  which-function-mode: t
  icomplete-mode: t
  global-hi-lock-mode: t
  hi-lock-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  use-hard-newlines: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent messages:
open-network-stream: Failed connect: No route to host
Connecting to irc.freenode.net...
open-network-stream: Failed connect: No route to host
Connecting to irc.freenode.net...done
Connecting to irc.devel.redhat.com...done
funcall-interactively: End of buffer
mwheel-scroll: Beginning of buffer [4 times]
Mark set
mwheel-scroll: Beginning of buffer

Load-path shadows:
None found.

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tls gnutls face-remap conf-mode js sgml-mode json map thingatpt
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gnus-ems nnheader gnus-util mail-utils mm-util help-fns mail-prsvr
wid-edit time desktop frameset cus-start cus-load kr-init iso-transl
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server term disp-table ehelp ring hi-lock finder-inf info package
epg-config seq byte-opt gv bytecomp byte-compile cl-extra help-mode
easymenu cconv cl-loaddefs pcase cl-lib mule-util tooltip eldoc electric
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tabulated-list newcomment elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame 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 charscript case-table epa-hook jka-cmpr-hook help
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dbusbind inotify dynamic-setting system-font-setting font-render-setting
xwidget-internal move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 337704 14852)
 (symbols 48 36689 0)
 (miscs 40 2764 705)
 (strings 32 72872 11293)
 (string-bytes 1 2215683)
 (vectors 16 31204)
 (vector-slots 8 689180 7376)
 (floats 8 317 229)
 (intervals 56 9731 0)
 (buffers 976 87))

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