www.delorie.com/archives/browse.cgi   search  
Mail Archives: cygwin/2019/06/17/10:30:48

X-Recipient: archive-cygwin AT delorie DOT com
DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
:list-unsubscribe:list-subscribe:list-archive:list-post
:list-help:sender:mime-version:references:in-reply-to:from:date
:message-id:subject:to:content-type:content-transfer-encoding;
q=dns; s=default; b=ZXlTrl4hcjuFfyGkBeySv9FJmW80lslQU6V7TlXVrnd
eZJlCIW+hDK/EAt2j40OAvYNaBgl3vL4tP/2cnm6ExwNnicLcnKRVFq7r9MCrvx/
thcsEU36YyXZy7daMeh8hwvUcJIOBqLrhsYpuY9e2QZliAVcgR3VexZQxjC7+YOE
=
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
:list-unsubscribe:list-subscribe:list-archive:list-post
:list-help:sender:mime-version:references:in-reply-to:from:date
:message-id:subject:to:content-type:content-transfer-encoding;
s=default; bh=Vfh7WYV2iGsCsPhkyl2cKnBAJ+g=; b=a9/AeRtjdNjwZA2FI
fpJzuyK1TIaQifM8cAqxiOu7W5v3Xh162HePSrXSpp5Tmpic63ukFyzYgQZyTAaU
LPBdrjLVgxKQ7tNd25HIkVcbyBuduwnse1hDdkpLHwvcutLBKUGcUHghKjolnCrM
R8oZ4sW0DK1xXECypkqHekniZg=
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Authentication-Results: sourceware.org; auth=none
X-Spam-SWARE-Status: No, score=0.0 required=5.0 tests=AWL,BAYES_00,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,SPF_PASS autolearn=ham version=3.3.1 spammy=alle, sk:unsubsc, cygwincom, UD:cygwin.com
X-HELO: mail-io1-f53.google.com
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :content-transfer-encoding; bh=1fEsR8EAJERhRqE6epdLzde6xAaueYOpuAw0zLqhb98=; b=clg0mYfucLnPUmmj4zVWG1YEdtiXvuPw5k3dUbfzjXxb54Mk4m/vBZCFw7Mt6/d3fF UUGUgpOE3L0wWGDpP52YZOIxcioKWflVT78uz8zj3uwTyYChsfZQIBYLYn7tPCjliy54 nzEic0vV9Ze3AOOlmZBQW+FTLcFbirr13PddNcvBlGYNF8kgCq1x9SFl+uXZ2KfKGpwl zNuAGjRLV3XB0pOwag3inSy0Xa8HUTLU8RpwTo/Ek7mwYfs6Yxh0IMF1NgpykxP7cCUw lYqsxXa324gZKy89uJhseyzZuvVGZtnZsMiNqH8rYDrKG6eoPVHLbZPusS07d2Tex99X QYMg==
MIME-Version: 1.0
References: <CAJwCUQOCtFOO6PbM0D7oCi2ErsXUnnKBUHkej50dAzFu_wj6Lw AT mail DOT gmail DOT com> <db5c5634-1faf-47da-0902-90595a4cacde AT SystematicSw DOT ab DOT ca>
In-Reply-To: <db5c5634-1faf-47da-0902-90595a4cacde@SystematicSw.ab.ca>
From: Marco Coletti <colemarc AT gmail DOT com>
Date: Mon, 17 Jun 2019 16:29:10 +0200
Message-ID: <CAJwCUQNuhxfrC50Vn0gCoea6f6vWaHinp=P+81dOOsfSkjdWsw@mail.gmail.com>
Subject: Re: balance command complains about missing rendezvous directory
To: Brian DOT Inglis AT systematicsw DOT ab DOT ca, cygwin AT cygwin DOT com
X-IsSubscribed: yes
X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id x5HEUQix003643 

I found a stray version of balance.exe outside of the cygwin direcotry tree.

Now the problem is this:
=======
$ /usr/sbin/balance -d -f -b 127.0.0.1 1080 127.0.0.1:1090
argv[0]=/usr/sbin/balance
bindhost=127.0.0.1
source port 1080
file /var/run/balance/balance.1080.127.0.0.1 already exists
using AF_UNSPEC
shmget: Function not implemented

$ cygcheck.exe /usr/sbin/balance
C:\cygwin64\usr\sbin\balance.exe
  C:\cygwin64\bin\cygwin1.dll
    C:\windows\system32\KERNEL32.dll
      C:\windows\system32\ntdll.dll
      C:\windows\system32\KERNELBASE.dll
========


Il giorno ven 14 giu 2019 alle ore 22:18 Brian Inglis
<Brian DOT Inglis AT systematicsw DOT ab DOT ca> ha scritto:
>
> On 2019-06-14 09:25, Marco Coletti wrote:
> > Windows 10 x64
> > Just installed Cygwin and balance package.
> > =======
> > $ balance -d -f -b 127.0.0.1 1080 127.0.0.1:1090
> > source port 1080
> > ERROR: rendezvous directory not available and/or creatable
> >        please create /var/run/balance/ with mode 01777 like this:
> >        # mkdir -m 01777 /var/run/balance/
> > argv[0]=/usr/bin/balance
> > bindhost=127.0.0.1
> > $ ls -ld /var/run/balance
> > drwxrwxrwt+ 1 SO000419 Domain Users 0 Jun 14 16:48 /var/run/balance
> > $ ls -l /var/run/balance/.keep-balance
> > -rw-r--r-- 1 SO000419 Domain Users 0 Apr 28  2013 /var/run/balance/.keep-balance
> > ========
> > The same balance command works on Ubuntu 16.04.6.
>
> The error is produced by the following code in balance.c:
>
>   stat(SHMDIR, &buffer);
>   if (!S_ISDIR(buffer.st_mode)) {
>     mode_t old = umask(0);
>     if (mkdir(SHMDIR, 01777) < 0) {
>       if(errno != EEXIST) {
>         fprintf(stderr, "ERROR: rendezvous directory not available and/or
> creatable\n");
>         fprintf(stderr, "       please create %s with mode 01777 like this: \n",
> SHMDIR);
>         fprintf(stderr, "       # mkdir -m 01777 %s\n", SHMDIR);
>         umask(old);
>         exit(EX_UNAVAILABLE);
>       }
>     }
>     umask(old);
>   }
>
> where balance.h defines:
> #define SHMDIR          "/var/run/balance/"
>
> I ran mkdir under strace on a similar directory and got the expected errno:
> $ ls -dglo /var/run/blkid
> drwxrwxrwt+ 1 0 Mar 23 05:30 /var/run/blkid
> $ strace -o mkdir.strace /bin/mkdir -m01777 /var/run/blkid/
> /usr/bin/mkdir: cannot create directory ‘/var/run/blkid/’: File exists
> $ grep -m1 ', errno' mkdir.strace
> 58   71709 [main] mkdir 5564 mkdir: -1 = mkdir(/var/run/blkid, 1005), errno 17
> $ fgrep -w EEXIST /usr/include/sys/errno.h
> #define EEXIST 17       /* File exists */
>
> You could run balance under strace to see the errno reported:
> $ strace -o balance.strace balance -d -f -b 127.0.0.1 1080 127.0.0.1:1090
> and scan balance.strace log for the mkdir call and errno value as above, and
> what happens after.
>
> If the strace output does not show enough info, you may have to install the
> balance-debuginfo package to be able to run balance under gdb, to see the mkdir
> errno value returned, and what happens after.
>
> The quoted code is not very robust, as buffer is on the stack so starts with
> random bits, and the stat result is not checked to see if it succeeds, before
> checking the mode, which may be unset; it assumes static zero initialization,
> failing the mode check if stat fails; it would be safer rewritten as:
>
>   if (stat(SHMDIR, &buffer) < 0 ||
>       !S_ISDIR(buffer.st_mode)) {
>
> --
> Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
>
> This email may be disturbing to some readers as it contains
> too much technical detail. Reader discretion is advised.
>
> --
> Problem reports:       http://cygwin.com/problems.html
> FAQ:                   http://cygwin.com/faq/
> Documentation:         http://cygwin.com/docs.html
> Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
>

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -


  webmaster     delorie software   privacy  
  Copyright © 2019   by DJ Delorie     Updated Jul 2019