bug#29615: 25.2; DNS multiple addresses and `open-protocol-stream`

bug#29615: 25.2; DNS multiple addresses and `open-protocol-stream`

[Live System User]

Hi,

        I'm currently having a problem connecting to my IMAP server
        using Emacs although accessing my SMTP server (which has
        only 1 IP address) is working fine.

        While trying to connect to my IMAP server using GNUtls, I
        get the following error:


Debugger entered--Lisp error: (error "aol/993 Name or service not known")
  make-network-process(:name "*nnimap*" :buffer #<buffer  *nnimap aol nil  *nntpd**-338562> :host "aol" :service "993" :nowait nil)
  open-network-stream("*nnimap*" #<buffer  *nnimap aol nil  *nntpd**-338562> "aol" "993")
  open-gnutls-stream("*nnimap*" #<buffer  *nnimap aol nil  *nntpd**-338562> "aol" "993")
  network-stream-open-tls("*nnimap*" #<buffer  *nnimap aol nil  *nntpd**-338562> "aol" "993" (:type ssl :warn-unless-encrypted t :return-list t :shell-command "ssh %s imapd" :capability-command "1 CAPABILITY.\n" :always-query-capabilities t :end-of-command ".\n" :success " OK " :starttls-function #[(capabilities) "\302\b\303\304.\305...#)\266\203\205..\306\207" [capabilities inhibit-changing-match-data "STARTTLS" nil t string-match "1 STARTTLS.\n"] 7]))
  open-protocol-stream("*nnimap*" #<buffer  *nnimap aol nil  *nntpd**-338562> "aol" "993" :type ssl :warn-unless-encrypted t :return-list t :shell-command "ssh %s imapd" :capability-command "1 CAPABILITY.\n" :always-query-capabilities t :end-of-command ".\n" :success " OK " :starttls-function #[(capabilities) "\302\b\303\304.\305...#)\266\203\205..\306\207" [capabilities inhibit-changing-match-data "STARTTLS" nil t string-match "1 STARTTLS.\n"] 7])
  nnimap-open-connection-1(#<buffer  *nntpd*>)
  nnimap-open-connection(#<buffer  *nntpd*>)
  nnimap-open-server("aol" ((nnimap-address "imap.aim.com") (nnimap-server-port 993) (nnimap-stream ssl) (nnimap-list-pattern ("*")) (nnimap-expunge-on-close (quote never)) (nnimap-expunge nil) (imap-default-user "nyc4bos") (nnimap-username "nyc4bos") (nnimap-user "nyc4bos") (nnir-search-engine imap)))
  gnus-open-server((nnimap "aol" (nnimap-address "imap.aim.com") (nnimap-server-port 993) (nnimap-stream ssl) (nnimap-list-pattern ("*")) (nnimap-expunge-on-close (quote never)) (nnimap-expunge nil) (imap-default-user "nyc4bos") (nnimap-username "nyc4bos") (nnimap-user "nyc4bos") (nnir-search-engine imap)))
  gnus-server-open-server("nnimap:aol")
  funcall-interactively(gnus-server-open-server "nnimap:aol")
  call-interactively(gnus-server-open-server nil nil)
  command-execute(gnus-server-open-server)



        At the exact same time I am trying to connect to my IMAP server
        using Emacs (GNUtls) and it fails, I am able to conect to the
        IMAP server from the command shell prompt:


$ nslookup imap.aim.com
Server:		8.8.8.8
Address:	8.8.8.8#53

Non-authoritative answer:
imap.aim.com	canonical name = nginx.aol.com.
nginx.aol.com	canonical name = nginx.mx.aol.com.aol.akadns.net.
Name:	nginx.mx.aol.com.aol.akadns.net
Address: 152.163.3.66
Name:	nginx.mx.aol.com.aol.akadns.net
Address: 152.163.0.66
Name:	nginx.mx.aol.com.aol.akadns.net
Address: 152.163.0.65
Name:	nginx.mx.aol.com.aol.akadns.net
Address: 152.163.0.97
Name:	nginx.mx.aol.com.aol.akadns.net
Address: 152.163.3.65
Name:	nginx.mx.aol.com.aol.akadns.net
Address: 152.163.0.98

$ telnet imap.aim.com 993
Trying 152.163.0.65...
Connected to imap.aim.com.
Escape character is '^]'.



$ netstat -tulpan
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
cp        0      0 10.0.1.200:44712        152.163.0.65:993        ESTABLISHED 
7262/telnet         



        I think that problem might be related to the multiple address
        results returned by the resolver (DNS) and the interaction
        with the `open-protocol-stream' inner functions.

        Perhaps it's failing on one of the multiple resolved IP
        addresses found amd not trying the next resolved IP address
        that was returned (until the pool is exhausted) before
        giving up with the error "aol/993 Name or service not known"?

        Thanks.
        



In GNU Emacs 25.2.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.20.10)
 of 2017-05-02 built on buildvm-17.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.11803000
Configured using:
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 --host=x86_64-redhat-linux-gnu --program-prefix=
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 build_alias=x86_64-redhat-linux-gnu host_alias=x86_64-redhat-linux-gnu
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 LDFLAGS=-Wl,-z,relro
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'

Configured features:
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ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES XWIDGETS

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
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Major mode: Fundamental

Minor modes in effect:
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Recent messages:
Mark set [2 times]
Opening connection to aol via tls...
Unable to open server nnimap+aol due to: aol/993 Name or service not known
<mouse-6> is undefined
mwheel-scroll: Beginning of buffer
<mouse-6> is undefined
<double-mouse-6> is undefined
<triple-mouse-6> is undefined [3 times]
Opening connection to aol via tls...
Unable to open server nnimap+aol due to: aol/993 Name or service not known

Load-path shadows:
None found.

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bug#29615: 25.2; DNS multiple addresses and `open-protocol-stream`

[Andreas Schwab]

On Dez 08 2017, Live System User <nyc4bos@aol.com> wrote:

>         Perhaps it's failing on one of the multiple resolved IP
>         addresses found amd not trying the next resolved IP address
>         that was returned (until the pool is exhausted) before
>         giving up with the error "aol/993 Name or service not known"?

Does it work if you use one of the working IP addresses?

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#29615: 25.2; DNS multiple addresses and `open-protocol-stream'

[Live System User]

 (heap 1024 95747 32110))

On Dez 08 2017, Andreas Schwab <schwab <at> linux-m68k.org> wrote:
>On Dez 08 2017, Live System User <nyc4bos <at> aol.com> wrote:
>
>>         Perhaps it's failing on one of the multiple resolved IP
>>         addresses found amd not trying the next resolved IP address
>>         that was returned (until the pool is exhausted) before
>>         giving up with the error "aol/993 Name or service not known"?
>
>Does it work if you use one of the working IP addresses?

      Oddly enough it doesn't!

      Neither adding the working IP address to /etc/hosts nor changing
      `gnus-secondary-select-methods' nnimap-address to that address
      worked.

      But when I changed the stanza from:

          nnimap "aol"

      to

          nnimap "imap.aim.com"

      it worked.

      So apparremtly, defining the slot

           (nnimap-address "imap.aim.com")

      is not being honored when `gnus-secondary-select-methods'
      contains:

 (nnimap "aol"
	 (nnimap-address "imap.aim.com")
	 (nnimap-server-port 993)
	 (nnimap-stream ssl)


      Gnus is using "aol" instead of "imap.aim.com" as evidenced
      by if I add

            152.163.0.97 aol

      to /etc/hosts I am now able to connect when the stanza is "aol".

      Based on the backtrace I sent previously, are the correct
      parameters being sent?

      It appears that the function `nnimap-open-server' has the
      correct parameters passed to `nnimap-open-connection' so
      what or where is the problem?
      
      Thanks.

bug#29615: 25.2; DNS multiple addresses and `open-protocol-stream`

[Glenn Morris]

Live System User wrote:

>         I'm currently having a problem connecting to my IMAP server

As previously reported by you in bugs#23591, 23592, 23351, 26509, 28689, ....
It sure seems to me like you just have a flaky network connection.

bug#29615: 25.2; DNS multiple addresses and `open-protocol-stream'

[Andreas Schwab]

On Dez 08 2017, Live System User <nyc4bos@aol.com> wrote:

>  (nnimap "aol"
> 	 (nnimap-address "imap.aim.com")
> 	 (nnimap-server-port 993)
> 	 (nnimap-stream ssl)

I'm using similar select methods, and they work for me.  But I don't set
nnimap-stream or nnimap-server-port, but let Gnus figure that out by
itself.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#29615: 25.2; DNS multiple addresses and `open-protocol-stream`

[Live System User]

On Dez 09 2017, Andreas Schwab <schwab <at> linux-m68k.org> wrote:
>On Dez 08 2017, Live System User <address@hidden> wrote:
>
>>  (nnimap "aol"
>>        (nnimap-address "imap.aim.com")
>>        (nnimap-server-port 993)
>>        (nnimap-stream ssl)
>
>I'm using similar select methods, and they work for me.  But I don't set
>nnimap-stream or nnimap-server-port, but let Gnus figure that out by
>itself.


        It appears that `open-protocol-stream' is being passed the
        stanza name/label by either the `nnimap-open-connection' or
        ``nnimap-open-connection-1' functions instead of the explicit
        specified value of "nnimap-address":

	      (open-protocol-stream
	       "*nnimap*" (current-buffer) nnimap-address
	       (nnimap-map-port (car ports))
	       :type nnimap-stream
               [...]


        The `open-protocol-stream' function is defined as:
        
        (open-protocol-stream NAME BUFFER HOST SERVICE &rest PARAMETERS)


        According to the backtrace, the HOST being passed to and used
        by `open-protocol-stream' is "aol":

open-protocol-stream("*nnimap*" #<buffer  *nnimap aol nil  *nntpd**-338562> "aol" "993" :type ssl


        However, this same backtrace shows

  nnimap-open-server("aol" ((nnimap-address "imap.aim.com")
  (nnimap-server-port 993) (nnimap-stream ssl)

        So why isn't [nnimap-address "imap.aim.com"] being used?
        It should be passed to `open-protocol-stream' by
        `nnimap-open-connection-1' (which gets it from
        `nnimap-open-connection').

        In your setup, can you confirm that the "nnimap-address"
        address is being passed and used and NOT the stanza name/label
        in the functions `nnimap-open-connection',
        `nnimap-open-connection-1' and `open-protocol-stream'?

        Thanks.

bug#29615: 25.2; DNS multiple addresses and `open-protocol-stream`

[Andreas Schwab]

On Dez 10 2017, Live System User <nyc4bos@aol.com> wrote:

>         In your setup, can you confirm that the "nnimap-address"
>         address is being passed and used and NOT the stanza name/label
>         in the functions `nnimap-open-connection',
>         `nnimap-open-connection-1' and `open-protocol-stream'?

I see nnimap-address globally set to the correct host name when these
functions are called.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#29615: 25.2; DNS multiple addresses and `open-protocol-stream`

[Live System User]

On Dez 10 2017, Andreas Schwab <schwab <at> linux-m68k.org> wrote:
>On Dez 10 2017, Live System User <address@hidden> wrote:
>
>>         In your setup, can you confirm that the "nnimap-address"
>>         address is being passed and used and NOT the stanza name/label
>>         in the functions `nnimap-open-connection',
>>         `nnimap-open-connection-1' and `open-protocol-stream'?
>
>I see nnimap-address globally set to the correct host name when these
>functions are called.

           Just to confim:  You are ALSO stating that your global
           nnimap-address is NOT the same as your stanza name/label?
           (e.g. the stanza name /label is NOT identical to your correct
           host name or "nnimap-address" value)
           
           Thanks for your patience.

bug#29615: 25.2; DNS multiple addresses and `open-protocol-stream`

[Andreas Schwab]

On Dez 10 2017, Live System User <nyc4bos@aol.com> wrote:

>            Just to confim:  You are ALSO stating that your global
>            nnimap-address is NOT the same as your stanza name/label?

Right, I'm using an abbrevation for the method name, different from the
nnimap-address in the parameters.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."