cygwin 1.3.11-3: Strange variable contents when logging via telnet

cygwin 1.3.11-3: Strange variable contents when logging via telnet

[Pavel Tsekov]

Hello, there! :)

I've noticed that the inetd_dummy environment variable contains some
strange value - is this the expected content of this variable ?

inetd_dummy=$'xxx\201zdR\200\f\314Y\361\004'


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Re: cygwin 1.3.11-3: Strange variable contents when logging via telnet

[Pavel Tsekov]

PT> I've noticed that the inetd_dummy environment variable contains some
PT> strange value - is this the expected content of this variable ?

PT> inetd_dummy=$'xxx\201zdR\200\f\314Y\361\004'


More info:

I reverted back to 1.3.9 (I couldn't find 1.3.10 on my disk) and
inetd_dummy contains only "xxx" - without the double quotes.


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Re: cygwin 1.3.11-3: Strange variable contents when logging via telnet

[Christopher Faylor]

On Wed, Jun 26, 2002 at 04:17:14PM +0200, Pavel Tsekov wrote:
>PT> I've noticed that the inetd_dummy environment variable contains some
>PT> strange value - is this the expected content of this variable ?
>
>PT> inetd_dummy=$'xxx\201zdR\200\f\314Y\361\004'
>
>
>More info:
>
>I reverted back to 1.3.9 (I couldn't find 1.3.10 on my disk) and
>inetd_dummy contains only "xxx" - without the double quotes.

That's what I get with (the equivalent of) the most recent snapshot.

cgf

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Re[2]: cygwin 1.3.11-3: Strange variable contents when logging via telnet

[Pavel Tsekov]

Hello Christopher,

Wednesday, June 26, 2002, 4:47:25 PM, you wrote:

CF> On Wed, Jun 26, 2002 at 04:17:14PM +0200, Pavel Tsekov wrote:
>>PT> I've noticed that the inetd_dummy environment variable contains some
>>PT> strange value - is this the expected content of this variable ?
>>
>>PT> inetd_dummy=$'xxx\201zdR\200\f\314Y\361\004'
>>
>>
>>More info:
>>
>>I reverted back to 1.3.9 (I couldn't find 1.3.10 on my disk) and
>>inetd_dummy contains only "xxx" - without the double quotes.

CF> That's what I get with (the equivalent of) the most recent snapshot.

Oh, well :) It's pure luck though ! The good news is that the problem
doesn't lie in cygwin1.dll at all but in inetd.

Here is the snippet which deals with that 'inetd_dummy' env var -
inetd.c, line 702:

    {
        /* space for daemons to overwrite environment for ps */
#define DUMMYSIZE   100
        char dummy[DUMMYSIZE];

        (void)memset(dummy, 'x', sizeof(DUMMYSIZE) - 1);
        dummy[DUMMYSIZE - 1] = '\0';
        (void)setenv("inetd_dummy", dummy, 1);
    }

Obviously the memset () call is incorrect - the size argument should
either be DUMMYSIZE - 1 or sizeof (dummy) - 1.

Btw I haven't found the place where this environment variable
is used by the 'daemons', as the comment points. Maybe is is safe to
just remove it ! :)


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Re: cygwin 1.3.11-3: Strange variable contents when logging via telnet

[Corinna Vinschen]

On Wed, Jun 26, 2002 at 05:23:19PM +0200, Pavel Tsekov wrote:
> Here is the snippet which deals with that 'inetd_dummy' env var -
> inetd.c, line 702:
> 
>     {
>         /* space for daemons to overwrite environment for ps */
> #define DUMMYSIZE   100
>         char dummy[DUMMYSIZE];
> 
>         (void)memset(dummy, 'x', sizeof(DUMMYSIZE) - 1);
>         dummy[DUMMYSIZE - 1] = '\0';
>         (void)setenv("inetd_dummy", dummy, 1);
>     }
> 
> Obviously the memset () call is incorrect - the size argument should
> either be DUMMYSIZE - 1 or sizeof (dummy) - 1.

Thanks for finding this.  I will create a new version of inetutils
tomorrow.

> Btw I haven't found the place where this environment variable
> is used by the 'daemons', as the comment points. Maybe is is safe to
> just remove it ! :)

I have actually no idea when that inet_dummy was introduced and
what it's good for.  Perhaps Chris has a clue.

Corinna

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Corinna Vinschen                  Please, send mails regarding Cygwin to
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Re: cygwin 1.3.11-3: Strange variable contents when logging via telnet

[Christopher Faylor]

On Wed, Jun 26, 2002 at 06:40:46PM +0200, Corinna Vinschen wrote:
>I have actually no idea when that inet_dummy was introduced and
>what it's good for.  Perhaps Chris has a clue.

I think it is for those systems where argv space competes with environ
space.  I used to do similar things with UNIX programs back in the 80's.

I think this should just be #ifndef CYGWIN.  It will have no effect on
cygwin one way or the other.

cgf

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