Using your suggestion, I've created the following program:
#include <linux/socket.h>
#include <linux/in.h>
#include <errno.h>
#include <stdio.h>
char* get_viewer_ipaddress()
{
struct sockaddr_in s;
char *client_ip = NULL;
int len, ret_val;
if(client_ip == NULL)
{
memset(&s,0,sizeof(s));
len = sizeof(s);
s.sin_family = AF_INET;
/*
* when launched from inetd, stdin, stdout and stderr
* are mapped to sd. Hence passing 0 to getpeername
*/
ret_val = getpeername(0, (struct sockaddr *)&s, &len);
if(!ret_val)
{
client_ip = (char *)inet_ntoa(s.sin_addr);
printf("Inf: retrieved client IP address %s\n",
client_ip);
}
else
{
client_ip = NULL;
printf("Err: could not retrieve client IP
address, error=%d\n", errno);
}
}
return client_ip;
}
int main(int argc, char *argv[])
{
get_viewer_ipaddress();
return(0);
}
However, when I run this within an xterm running in a VNC desktop, I get
an error, ENOTSOCK (88), indicating the handle is not a socket. Hence,
I am assuming this would need to be added to the Xvnc source, and
determined from within Xvnc?
> -----Original Message-----
> From: Jinu Mathew Joy [mailto:[EMAIL PROTECTED]
> Sent: Sunday, January 22, 2006 9:46 PM
> To: Tim Underwood; [email protected]
> Subject: Re: Client IP address when using Xvnc with -inetd
>
> You would use -inetd option when running Xvnc from xinetd.
> Say you have configured the xinetd process to listen for
> connections on behalf of Xvnc on port xxxx.
> As soon as a request arrives on the configured port xxxx,
> xinetd forks off Xvnc and maps the stdin, stdout and stderr
> to the socket descriptor.
>
> What it means is now on if you do a printf() the string would
> be directed to the client(vncviewer) and not stdout. Since
> stdout is mapped to the socket descriptor and this stage.
>
> Hence if you want the client IP, all you would do is the following..
>
> char* get_viewer_ipaddress()
> {
> struct sockaddr_in s;
> char *client_ip = NULL;
> int len, ret_val;
>
> if(client_ip == NULL)
> {
> memset(&s,0,sizeof(s));
> len = sizeof(s);
> s.sin_family = AF_INET;
>
> /*
> * when launched from inetd, stdin, stdout and stderr
> * are mapped to sd. Hence passing 0 to getpeername
> */
> ret_val = getpeername(0, (struct sockaddr *)&s, &len);
> if(!ret_val)
> {
> client_ip = (char *)inet_ntoa(s.sin_addr);
> DEV_LOG("Inf: retrieved client IP
> address %s\n", client_ip);
> }
> else
> {
> client_ip = NULL;
> DEV_LOG("Err: could not retrieve client
> IP address\n");
> }
> }
>
> return client_ip;
> }
>
> let me know if that helps..
>
> -Jinu
>
>
>
> >>> "Tim Underwood" <[EMAIL PROTECTED]> 01/21/06 1:58 AM >>>
> How can I determine a client's IP address, when they connect
> to a server running Xvnc with the -inetd option?
>
> Can't use $DISPLAY, since it's the server's address, and I
> don't find anything identifiable that can be used to get back
> to the client.
> Can't
> even find anything via the process chain to get from a
> running application back to the Xvnc process (xterm's run
> within the VNC client eventually show their parent as "init"
> or process id 1, never going back to the Xvnc process I know
> is the one I started).
>
> I need to do this for some customized settings for terminals
> attaching to our server (printers, etc.), and identifying
> them for other purposes.
>
> Any ideas?
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