A.P. Lawrence

netcat error messages

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From - Mon Aug 21 08:02:19 2000
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From: kevin@shady.com (Kevin Smith, ShadeTree Software, Inc.)
Newsgroups: comp.unix.sco.misc
Subject: Re: Netcat problem? - repost
Date: 20 Aug 2000 22:11:27 -0400
Organization: ShadeTree Software, Inc.
Lines: 86 Message-ID: <8nq34f$srl@shady.shady.com> References: <m13QauO-000AmYC@egps.com> <uhf0qscrdf5diag6ikp76jn3qvttt2nioc@4ax.com>
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In article <uhf0qscrdf5diag6ikp76jn3qvttt2nioc@4ax.com> jeffl@comix.santa-cruz.ca.us writes:
>On Sun, 20 Aug 2000 19:37:28 GMT, Nachman Yaakov Ziskind
><awacs@egps.com> wrote:
>
>>[reposting this b/c it doesn't show up in DejaNews. Also, now Jeff L. is 
>>back :-)]
>
>I was just about to leave for Doug's party, when your message
>appeared.  If I'm late or miss something important, it's your fault.
>
>>3) Netcat gives the following results:
>>$ netcat -d 999 -h hp3 -p 9102
>>
>>debugl = 999
>>hostname = hp3
>>port = 9102
>>gethostbyname()=0x404340
>>socket()=3
>>sin.sin_addr.s_addr=0x2882b8d0
>>connect()=-1
>>Connect to port 9102 on hp3: Connection refused
>
>One of these days, I'll figure out what all that debug info means.
>However, the connect()=-1 is fairly obvious.  Your print server was
>lonely while you were gone, and has decided to not accept any of your
>excuses as to why you were gone.  My cat does the same thing.
>...

debugl = 999

    Your debug level.  Anything >= 1 triggers debug messages.
    There are no "levels", just on and off.

hostname = hp3

My Working for yourself E-Book will show you how to break free
from the 9 to 5 grind.

    Value from -h arg

port = 9102

    Value from -p arg

gethostbyname()=0x404340

    Return value of gethostbyname() which is the address of the
    hostent struct which is useless unless it's 0 which means there
    was an error.

    This translates the host name (hp3) into an ip address.

socket()=3

    Return value of the socket() call.  It's really a file descriptor
    for the network connection.  Not too many reasons for this to fail.
    Useless unless it's -1.  Should always be 3 (stdin = 0, stdout = 1,
    stderr = 2, 3 is next).

    This is the first half of opening a network connection.

sin.sin_addr.s_addr=0x2882b8d0

    The ip address in hex, as found by gethostbyname(), not adjusted
    for network byte order.

    0x2882b8d0 -> 0x28.0x82.0xb8.0xd0 -> 40.130.184.208 -> 208.184.130.40

    I should be using inet_ntoa() to show the ip.

connect()=-1

    The return from the connect() call.  Who knows why this was
    failing for the coff and not the elf versions.  I run a coff
    version on OSR 5.0.0 (compiled on OSR 5.x though).

    This is the second half of opening a network connection, where the
    target host is actually contacted and the connection is established.

Connect to port 9102 on hp3: Connection refused

    Output of

        perror("Connect to port <port> on <host>")
-- 
Do two rights make | Kevin Smith, ShadeTree Software, Philadelphia, PA, USA
a libertarian      | 001-215-487-3811  shady.com,kevin   bbs.cpcn.com,sysop
                   | dvtug.org,kevins--Delaware Valley Transit Users Group

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