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From: dan@asihub.AUTOSYS.COM (Dan O'Neill)
Newsgroups: comp.mail.sendmail
Subject: Sendmail 5.64 under Sun OS 4.1
Keywords: sun, sendmail, 5.64
Message-ID: <285@asihub.AUTOSYS.COM>
Date: 12 Sep 90 01:17:57 GMT
Organization: Cadence Design Systems
Lines: 56


Hardware:	Sparc 1+
OS:		4.1 w/ GFX patches
Sendmail ver:	5.64 from uunet


Sendmail 5.64 is now compiled on the Sun systems [thanks for all the
help!], but there seems to be a problem when another system tries to
make an SMTP connection to sendmail on the sun.

Here is a sample telnet connection which demonstrates the problem:

    % telnet sun4 25
    Connected to guava.
    Escape character is '^]'.
    220 guava.autosys.com Sendmail 5.64+/ease-smail2.5/evision: 2.5 ready ...
    250 Hello [192.5.98.42], why do you call yourself dogwood.autosys.com?

I ran the server in dbx and it appears that the 'gethostbyaddr' call
is failing in daemon.c, specifically line 249.  Here's the code
section:

    (void) signal(SIGCHLD, SIG_DFL);

    /* determine host name */

[ THIS NEXT CALL APPEARS TO BE FAILING, gethostbyaddr() ]

    hp = gethostbyaddr((char *) &RealHostAddr.sin_addr, 
		\ sizeof RealHostAddr.sin_addr, AF_INET);
    if (hp != NULL)
      (void) strcpy(buf, hp->h_name);
    else
    {
      extern char *inet_ntoa();

      /* produce a dotted quad */
      (void) sprintf(buf, "[%s]",
         inet_ntoa(RealHostAddr.sin_addr));  [THIS GENERATES 192.5.98.42]

    }

When gethostbyaddr() returns null, the RealHostAddr gets set to the IP
address of the client system.  This gets caught later on and causes
problems.

Sendmail was compiled using the -lresolv library and the necessary
getenv/setenv routines from the sendmail/support directory.

I need help on this one real quick.  Thanks everyone.. you've been
great.

-- 
Dan O'Neill                     Cadence Design Systems
dan@autosys.com                 San Diego, CA
{uunet|ncr-sd}!asihub!dan