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Can't connect to a specified port@address
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OpenQNX Forum Index » QNX Developers » General Programming
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invoker
Post subject: Can't connect to a specified port@address  PostPosted: Apr 18, 2008 - 10:43 AM
Active Member


Joined: Apr 15, 2008
Posts: 32
Hi

I'm trying to get my application up and running but I have some trouble
starting. I am using some code that I found on openQNX to get the connection.
I have read this topic:
http://www.openqnx.com/index.php?name=PNphpBB2&file=viewtopic&t=8140
I was hoping that I will manage to connect to a 23 port from my QNX
but unfortunately the connect() returns -1;
HELP! I would like to know how to connect to remote hosts.

I got such an environment

Windows Vista
(+ Telnet Server )
192.168.11.103---------------------------------------192.168.11.100 @SH7760 with QNX

QNX application code:

char dest_ip[]="192.168.1.103";
int dest_port=23;
char *packet_ptr = NULL;
int n;
int sfd;
struct sockaddr_in sa_in;
int send_bytes = 0;
int recv_bytes = 0;

memset(&sa_in,0,sizeof(sa_in));
if ( (sfd = socket(AF_INET, SOCK_STREAM, 0)) == SOCKET_ERROR)
{
// Code for sending error message
return 0;
}else{
//Code for sending info message
}

sa_in.sin_family = AF_INET;
sa_in.sin_addr.s_addr = inet_addr(dest_ip);
sa_in.sin_port = htons(dest_port);
if ( (connect(sfd, (struct sockaddr *) &sa_in, sizeof(sa_in))) == SOCKET_ERROR)
{
//Code for sending error message
return 0;
} else {
//Code for sending information message
}


connects returns -1
The port on Vista is open ( can telnet to it), firewall is off
Can ping form vista to sh and form sh to vista
Wireshark shows no activity to 23 port

what can be wrong?
 
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mario
Post subject: RE: Can  PostPosted: Apr 18, 2008 - 11:39 AM
QNX Master


Joined: Sep 01, 2002
Posts: 2783
Is this a typo: The source addresses in your code don't match.

192.168.11.103---------------------------------------192.168.11.100 @SH7760 with QNX


char dest_ip[]="192.168.1.103";
 
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invoker
Post subject: Re: RE: Can  PostPosted: Apr 18, 2008 - 02:37 PM
Active Member


Joined: Apr 15, 2008
Posts: 32
mario wrote:
Is this a typo: The source addresses in your code don't match.

192.168.11.103---------------------------------------192.168.11.100 @SH7760 with QNX


char dest_ip[]="192.168.1.103";


the code is running on SH7760 with QNX
source ip is 192.168.11.100 and the dest ip 192.168.1.103

so its correct?
 
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micro
Post subject:   PostPosted: Apr 18, 2008 - 03:33 PM
Senior Member


Joined: Jul 22, 2004
Posts: 333
Can you connect in any way to the qnx machine?

So telnet, ftp similar?
Since they belong to other subnets they would need to have a router in between.
 
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mario
Post subject:   PostPosted: Apr 18, 2008 - 04:09 PM
QNX Master


Joined: Sep 01, 2002
Posts: 2783
Are you SURE it's 192.168.1.103 and not 192.168.11.103. Either you description is wrong or the code is wrong.

Micro: if the netmask is 255.255.0.0 they can be on the same subnet. Plus the OP mentionned it would ping and telnet to the vista machine, I guess it's safe to assume everything is ok config wise.
 
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invoker
Post subject:   PostPosted: Apr 18, 2008 - 06:08 PM
Active Member


Joined: Apr 15, 2008
Posts: 32
mario wrote:
Are you SURE it's 192.168.1.103 and not 192.168.11.103. Either you description is wrong or the code is wrong.

Micro: if the netmask is 255.255.0.0 they can be on the same subnet. Plus the OP mentionned it would ping and telnet to the vista machine, I guess it's safe to assume everything is ok config wise.


good point - need to check it on Monday Cool thx
 
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invoker
Post subject:   PostPosted: Apr 21, 2008 - 07:57 AM
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Joined: Apr 15, 2008
Posts: 32
thanks for picking up my mistake!
beside that the code works Smile

thx!
 
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micro
Post subject:   PostPosted: Apr 21, 2008 - 12:55 PM
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Joined: Jul 22, 2004
Posts: 333
Oh ^^ i did not see that ping works.
*Read carefully again ^^*
 
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invoker
Post subject:   PostPosted: Apr 30, 2008 - 08:24 AM
Active Member


Joined: Apr 15, 2008
Posts: 32
I need some more help :/
There are many pieces of code that I found on the internet but most of them
are not working :/

I need to listen to a specific tcp port and throw what I receive to a buffer:

int sock;
struct sockaddr_in server;
int msgsock;
char buf[1024];
int rval;

sock = socket(AF_INET, SOCK_STREAM, 0);
server.sin_family = AF_INET;
server.sin_port = 1666;
bind(sock, (struct sockaddr *)&server, sizeof(server));

listen(sock, 5);
do {
msgsock = accept(sock, 0, 0);
if (msgsock == -1)
{
return EXIT_FAILURE;
} else
do {
memset(buf, 0, sizeof(buf));
rval = read(msgsock, buf, 1024);
PtTextModifyText( ABW_PtText1, 0, 0, -1, buf,sizeof(buf));
} while (rval > 0);
close(msgsock);
} while (1);

Could anyone have a quick look at this and tell me why its wrong?
Thanks! Smile
 
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mario
Post subject:   PostPosted: Apr 30, 2008 - 11:36 AM
QNX Master


Joined: Sep 01, 2002
Posts: 2783
you need to use hton on the assignement to sin_port otherwise I thing you end up with using port 6616
 
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mezek
Post subject:   PostPosted: Apr 30, 2008 - 12:39 PM
Senior Member


Joined: Mar 03, 2004
Posts: 185
memset(&server, 0, sizeof(sockaddr_in));
server.sin_family = AF_INET;
server.sin_port = htons(1666);
server.sin_addr = INADDR_ANY;
 
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invoker
Post subject:   PostPosted: Apr 30, 2008 - 01:07 PM
Active Member


Joined: Apr 15, 2008
Posts: 32
memset(&server, 0, sizeof(sockaddr_in));
server.sin_family = AF_INET;
server.sin_port = htons(1666);
server.sin_addr = INADDR_ANY;

I change the first line to memset(&server, 0, sizeof(server)); because I was not compiling.
I got an error on the 4th line - incompatible types in assignment :/
 
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mezek
Post subject:   PostPosted: Apr 30, 2008 - 01:28 PM
Senior Member


Joined: Mar 03, 2004
Posts: 185
yea, sorry, i meant
memset(&server, 0, sizeof(struct sockaddr_in));
and
server.sin_addr.s_addr = INADDR_ANY;
 
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invoker
Post subject:   PostPosted: Apr 30, 2008 - 02:10 PM
Active Member


Joined: Apr 15, 2008
Posts: 32
mezek wrote:
yea, sorry, i meant
memset(&server, 0, sizeof(struct sockaddr_in));
and
server.sin_addr.s_addr = INADDR_ANY;


Thank you mezek and mario Smile

As I'm developing under windows I had to think a way to test it.
I found this code in C# tcp server and client in c#


I still got a problem that my server on qnx receives only first message but I will get to the bottom of this.

Both the client and the server written for qnx works - if anyone will
in the future run into this post.
 
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invoker
Post subject:   PostPosted: Apr 30, 2008 - 02:17 PM
Active Member


Joined: Apr 15, 2008
Posts: 32
I wonder - do You think its a good idea to put a loop in which the connections are
accepted and the messages received in a separate thread?
( I'm using PhAB If anyone asks)
 
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