Submitted for your approval, Code for the EchoIPDaemon:
Code:
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <stdio.h>
int terminate=0;
void signalhd(int senal){
if (senal==SIGINT){
printf("...Interrupt...\n");
terminate=1;
}
}
void sigchld_handler(int s)
{
while(wait(NULL) > 0);
}
int main()
{
struct sigaction sa;
struct sockaddr_in sin, fsin;
int s, ssock, alen;
char *ipaddress;
sa.sa_handler = sigchld_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if (sigaction(SIGCHLD, &sa, NULL) == -1) {
perror("sigaction");
exit(1);
}
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(INADDR_ANY);
sin.sin_port = htons(6666);
if ((s = socket(PF_INET, SOCK_STREAM, 0)) < 0)
{
perror("Cant create socket");
exit(1);
}
if (bind(s, (struct sockaddr *)&sin, sizeof sin) < 0)
{
perror("Cant assign addres");
exit(2);
}
if (listen(s, 5) < 0)
{
perror("Cant turn to listening mode");
exit(3);
}
signal (SIGINT,signalhd);
while (1)
{
if (terminate==1)
{
close(s);
exit(0);
}
alen = sizeof(fsin);
if ((ssock=accept(s, (struct sockaddr *)&fsin, &alen)) < 0)
{
if (errno == EINTR) continue;
perror("Accept failed");
exit(4);
}
switch (fork()) {
case -1:{
perror ("Forking error");
exit (5);
}
case 0: {
close(s);
exit(0);
}
default: {
ipaddress=(char *)inet_ntoa(fsin.sin_addr);
write(ssock, ipaddress, strlen(ipaddress));
close(ssock);
break;
}
}
}
return 0;
}
Its short, sweet, and to the point. I ran it and stress tested it on an extremely low end box and it can do about 70 per second. Im looking for suggestions on how to speed it up or improve it. Im thinking about implimenting it on a university server with a static IP and trying to get somebody with power to recognise it. Using it would be a simple matter of telling your program to connect and take all recieved information and just convert it to an ip address or display it as a string or whatever.
Lets Start A New Standard Service!
Apart from it showing you what external address you use to access the server, I don't see much point in is 
:
Submitted For Your Approval
