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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <utf.h>
#include <fmt.h>
#include "dat.h"
#include "fns.h"
#include "args.h"
enum {
LPORT = 7
};
int lfd, ncpu;
pthread_t *threads;
pthread_mutex_t attendlock;
int debug;
char *argv0;
/*
* echo service as of rfc862
*/
//void
//srvecho(int fd)
//{
// char buf[8192];
// int n;
//
// while((n = read(fd, buf, sizeof buf)) > 0)
// if(write(fd, buf, n) != n)
// return;
//}
//
//void*
//tmain(void *a)
//{
// char caddr[128];
// int cfd;
//
// for(;;){
// pthread_mutex_lock(&attendlock);
// if((cfd = acceptcall(lfd, caddr, sizeof caddr)) < 0)
// sysfatal("acceptcall: %r");
// pthread_mutex_unlock(&attendlock);
//
// if(debug)
// fprint(2, "thr#%lu accepted call from %s\n", pthread_self(), caddr);
//
// srvecho(cfd);
// close(cfd);
//
// if(debug)
// fprint(2, "thr#%lu ended call with %s\n", pthread_self(), caddr);
// }
//}
/*
* (udp)echo service as of rfc862
*/
void*
udpechosrv(void *a)
{
sockaddr_in csa;
uchar buf[4096];
char caddr[128], *cs;
int n, port;
uint csalen;
UDPEchoPlus ephdr;
struct timespec ts;
uvlong us;
memset(&csa, 0, sizeof(sockaddr_in));
csalen = sizeof(sockaddr_in);
for(;;){
pthread_mutex_lock(&attendlock);
if((n = recvfrom(lfd, buf, sizeof buf, 0, (sockaddr*)&csa, &csalen)) < 0){
pthread_mutex_unlock(&attendlock);
continue;
}
pthread_mutex_unlock(&attendlock);
clock_gettime(CLOCK_REALTIME, &ts);
us = ts.tv_sec*1e6;
us += ts.tv_nsec/1e3;
cs = inet_ntoa(csa.sin_addr);
port = ntohs(csa.sin_port);
snprint(caddr, sizeof caddr, "udp!%s!%d", cs, port);
if(debug)
fprint(2, "thr#%lu received %d byte datagram from %s\n", pthread_self(), n, caddr);
/* check for echo+ data */
if(n >= 24){
if(getechoplus(&ephdr, buf) < 0)
goto EchoBack;
ephdr.ressn = ephdr.gensn;
ephdr.rxtime = us;
ephdr.ntxfails = 0; /* being over-optimistic */
clock_gettime(CLOCK_REALTIME, &ts);
us = ts.tv_sec*1e6;
us += ts.tv_nsec/1e3;
ephdr.txtime = us;
putechoplus(&ephdr, buf);
}
EchoBack:
if(sendto(lfd, buf, n, 0, (sockaddr*)&csa, csalen) < 0)
continue;
if(debug)
fprint(2, "thr#%lu sent %d byte datagram to %s\n", pthread_self(), n, caddr);
}
}
static void
usage(void)
{
fprint(2, "usage: %s [-d]\n", argv0);
exit(1);
}
int
main(int argc, char *argv[])
{
int i;
ARGBEGIN{
case 'd': debug++; break;
default: usage();
}ARGEND;
if(argc != 0)
usage();
if((lfd = bindudp(LPORT)) < 0)
sysfatal("bindudp: %r");
ncpu = sysconf(_SC_NPROCESSORS_ONLN);
if(ncpu < 1)
ncpu = 1;
threads = emalloc(sizeof(pthread_t)*ncpu);
pthread_mutex_init(&attendlock, nil);
for(i = 0; i < ncpu; i++){
pthread_create(threads+i, nil, udpechosrv, nil);
if(debug)
fprint(2, "created thr#%lu\n", *(threads+i));
}
pause();
free(threads);
pthread_mutex_destroy(&attendlock);
exit(0);
}
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