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/* ping.c
*/
#include "config.h"
#include "copyright2.h"
#include <stdio.h>
#include <sys/types.h>
#include INC_NETINET_IN
#include <sys/time.h>
#include <math.h>
#include <errno.h>
#include "Wlib.h"
#include "defs.h"
#include "struct.h"
#include "data.h"
#include "packets.h"
#include "pingstats.h"
#include "socket.h"
#include "ping.h"
/* These are used only in pingstats.c */
int ping_iloss_sc = 0; /* inc % loss 0--100, server
*
* * * to client */
int ping_iloss_cs = 0; /* inc % loss 0--100, client
*
* * * to server */
int ping_tloss_sc = 0; /* total % loss 0--100, *
*
* * server to client */
int ping_tloss_cs = 0; /* total % loss 0--100, *
*
* * client to server */
int ping_lag = 0; /* delay in ms of last ping */
int ping_av = 0; /* rt time */
int ping_sd = 0; /* std deviation */
static int sum, n;
static int M, var;
static double s2;
static void sendServerPingResponse(int number);
static void calc_lag(void);
void handlePing(struct ping_spacket *packet) /* SP_PING */
{
ping = 1; /* we got a ping */
/* printf("ping received at %d (lag: %d)\n", msetime(), (int)packet->lag); */
sendServerPingResponse((int) packet->number);
ping_lag = ntohs(packet->lag);
ping_iloss_sc = (int) packet->iloss_sc;
ping_iloss_cs = (int) packet->iloss_cs;
ping_tloss_sc = (int) packet->tloss_sc;
ping_tloss_cs = (int) packet->tloss_cs;
calc_lag();
if (W_IsMapped(pStats)) /* pstat window */
updatePStats();
}
void startPing(void)
{
static
struct ping_cpacket packet;
extern int serverDead;
packet.type = CP_PING_RESPONSE;
packet.pingme = 1;
if (gwrite(sock, (char *) &packet, sizeof(struct ping_cpacket)) !=
sizeof (struct ping_cpacket))
{
printf("gwrite failed.\n");
serverDead = 1;
}
}
void stopPing(void)
{
static
struct ping_cpacket packet;
extern int serverDead;
packet.type = CP_PING_RESPONSE;
packet.pingme = 0;
if (gwrite(sock, (char *) &packet, sizeof(struct ping_cpacket)) !=
sizeof (struct ping_cpacket))
{
printf("gwrite failed.\n");
serverDead = 1;
}
}
static void sendServerPingResponse(int number) /* CP_PING_RESPONSE */
{
struct ping_cpacket packet;
int s;
extern int serverDead;
if (udpSock >= 0)
{
s = udpSock;
packets_sent++;
}
else
s = sock;
bzero(&packet, sizeof(packet));
packet.type = CP_PING_RESPONSE;
packet.pingme = (char) ping;
packet.number = (unsigned char) number;
/* count this one */
packet.cp_sent = htonl(packets_sent);
packet.cp_recv = htonl(packets_received);
/* printf("ping response sent at %d\n", msetime()); */
if (gwrite(s, (char *) &packet, sizeof(struct ping_cpacket)) !=
sizeof (struct ping_cpacket))
{
if (s == udpSock) {
s = sock;
if (gwrite(s, (char *) &packet, sizeof(struct ping_cpacket)) !=
sizeof (struct ping_cpacket))
{
serverDead = 1;
printf("gwrite failed again.\n");
}
}
}
}
static void calc_lag(void)
{
#ifdef nodef
/* probably ghostbusted */
if (ping_lag > 2000 || ping_lag == 0)
return;
#endif
n++;
sum += ping_lag;
s2 += (ping_lag * ping_lag);
if (n == 1)
return;
M = sum / n;
var = (s2 - M * sum) / (n - 1);
ping_av = M;
ping_sd = (int) sqrt((double) var);
}
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