I ever ask a question about daemon.
The Title is
"How can I get the ip of a machine that connect to my machine(daemon)"

I think the answer is correct after I read the answer.
But I can't get the same result with the same code on my solaris 5.8.
When I telnet 127.0.0.1 at port = 9999,I always get the message => "IP
is 0.0.0.0".
I can't get a message like "IP is 127.0.0.1".

Now,I want to know how to let the server response a message like "IP
is 192.168.166.11",
when I telnet to the server.

example : 
	The Solaris' ip is 192.168.166.123 And The port is 9999
	My ip is 192.168.166.11	
	At my machine,I use "telnet 192.168.166.123 9999"
	I wish the solaris server can response the message "IP is
192.168.166.11"

I supply the code for the daemon program

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Other information for this.
After I read the answer,I can't see any question about it.
So,I think "The code is correct,But I ignore something then let the
program can't get the ip of the peer".
And If you want to know why I ask the problem,you can see the
question-answer.
"How can I get the ip of a machine that connect to my
machine(daemon)",
Question ID: 254937 

---------------------------------------------------------------------------------------------------------------------
the following is the sample code(I have modify one line for
sun-solaris).
// Sample Code
#include <stdio.h>   
#include <string.h>   
#include <strings.h>   
#include <stdlib.h>   
#include <sys/socket.h> 
#include <netinet/in.h> 
 
struct sockaddr_in mysock; 
socklen_t namelen; // <= I change int type to socklen_t type for
sun-solaris
 
int main(void)   
{   
 char ap_command[1024];   
 int errcode; 
 char myname[]="mydaemon"; 
 
 namelen = sizeof(struct sockaddr_in); 
 if (getpeername(0, (struct sockaddr *)&mysock, &namelen)) { 
   fprintf(stderr, "%s : Failed to get peer name\n", myname); 
   perror(myname); 
 } 
 else 
   fprintf(stdout, "IP is %d.%d.%d.%d\n", 
    (mysock.sin_addr.s_addr>>24) & 255, 
    (mysock.sin_addr.s_addr>>16) & 255, 
    (mysock.sin_addr.s_addr>>8) & 255, 
    mysock.sin_addr.s_addr & 255); 
      
 memset(ap_command,'\0',1024);    
 setvbuf(stdout,NULL,_IOLBF,0);    
 while(fgets(ap_command,sizeof(ap_command),stdin) != NULL)   
 {   
  printf("ECHO:%s\n\r",ap_command);   
  memset(ap_command,'\0',1024);   
 }   
 return(0);   
}

---------------------------------------------------------------------------------------------------------------------

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Clarification of Question by adamhsu-ga on 18 Sep 2003 03:34 PDT

Actually,at Solaris:
1. inetd call accept and then return the socket's descriptor and the
ip-address of the peer.
2. then call fork and create the child-process of the inetd.
   Since the child-process can see his father's socket,so the
child-process also can use the socket's descriptor .
3. when the child-process call exec to run the real server.The memory
of the real server's process will replace the memory of the
child-process.he sockethe server process to tNow,we lose the
ip-address of the peer.But the socket that have connected alaways open
after exec.
4. for my daemon-program,I want to know how to get the socket's
descriptor that we lose.
5. someone tell me the following things:
   "Getpeername is called using file 0(stdin) as its first parameter.
This is because inetd connect I/O to the socket"
   I think what he say is correct.

---

Request for Question Clarification by maniac-ga on 18 Sep 2003 19:31 PDT

Hello Adamhsu,

I would be glad to answer your question without further payment. To do
that, I suggest you
 - please close this question
 - make a request for clarification at
  http://answers.google.com/answers/main?cmd=threadview&id=254937
so I can respond without further fee.

The fix may be as simple as replacing the fprintf statement with
  fprintf(stdout, "IP is %s\n", inet_ntoa(mysock.sin_addr);
but if that does not work - I have some other suggestions that can be
made.

  --Maniac