On 30 May 2002, Gerald Timothy Quimpo wrote:
> i'm writing a little server that will run from xinetd.
> since xinetd servers read incoming data from stdin and
> write outgoing data to stdout, i don't see how to get
> the IP number of the remote host. one way to do that
use getpeername() and inet_ntop(). Below is the classic mydaytime server
managed my xinetd or inetd that logs client ipaddr and port number.
1) compile it:
gcc mydaytime.c -o mydaytime
2) modify xinetd.conf and restart xinetd.
3) modify syslog.conf and restart syslogd to allow user and info logs.
4) test it:
%telnet mydaytime_host_name mydaytime_port_number
Trying XXX.XXX.XXX.XXX...
Connected to mydaytime_host_name.
Escape character is '^]'.
Server time: Fri May 31 12:06:25 2002
Connection closed by foreign host.
rowel
/*************mydaytime.c***********************/
#include <syslog.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <time.h>
#define MAXBUF 128
int main (int argc, char **argv)
{
socklen_t len;
struct sockaddr *cliaddr;
struct sockaddr_in *cliaddr_in;
char ipaddr[MAXBUF];
char mytime[MAXBUF];
unsigned short int port;
time_t ticks;
cliaddr = (struct sockaddr*) malloc(MAXBUF);
cliaddr_in = (struct sockaddr_in*) cliaddr;
len = MAXBUF;
getpeername(0,cliaddr,&len);
inet_ntop(AF_INET,&(cliaddr_in->sin_addr), ipaddr, sizeof(ipaddr));
port = ntohs(cliaddr_in->sin_port);
syslog(LOG_USER|LOG_INFO,"Connection from %s port %d",ipaddr,port);
ticks = time(NULL);
strcpy(mytime,"Server time: ");
strcat(mytime,ctime(&ticks));
write(1,mytime,strlen(mytime));
close(0);
exit(0);
}
/******************mydaytime.c**********************/
_
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