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ping.c
151 lines (123 loc) · 3.18 KB
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ping.c
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/*
* ping.c
*
*/
#include "copyright2.h"
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <math.h>
#include <errno.h>
#include "netrek.h"
#ifdef PING
/* 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 double p_s2;
static int p_sum, p_n;
static int p_M, p_var;
void
handlePing(packet) /* SP_PING */
struct ping_spacket *packet;
{
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()
{
static
struct ping_cpacket packet;
packet.type = CP_PING_RESPONSE;
packet.pingme = 1;
if(debug)
printf("W- %8d: %3d b TCP\n", mstime(), (int)sizeof(struct ping_cpacket));
if (gwrite(sock, (char *) &packet, sizeof(struct ping_cpacket)) !=
sizeof (struct ping_cpacket)) {
return;
}
}
void
stopPing()
{
static
struct ping_cpacket packet;
packet.type = CP_PING_RESPONSE;
packet.pingme = 0;
if(debug)
printf("W- %8d: %3d b TCP\n", mstime(), (int)sizeof(struct ping_cpacket));
if (gwrite(sock, (char *) &packet, sizeof(struct ping_cpacket)) !=
sizeof (struct ping_cpacket)) {
return;
}
}
void
sendServerPingResponse(number) /* CP_PING_RESPONSE */
int number;
{
struct ping_cpacket packet;
int s;
if (commMode == COMM_UDP){
s = udpSock;
packets_sent++;
} else
s = sock;
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(debug)
printf("W- %8d: %3d b %s\n", mstime(), (int)sizeof(struct ping_cpacket),
s == udpSock?"UDP":"TCP");
if (gwrite(s, (char *) &packet, sizeof(struct ping_cpacket)) !=
sizeof (struct ping_cpacket)) {
return;
}
}
void
calc_lag()
{
/* probably ghostbusted */
if (ping_lag > 2000)
return;
p_n++;
p_sum += ping_lag;
p_s2 += (ping_lag * ping_lag);
if (p_n == 1)
return;
p_M = p_sum / p_n;
p_var = (p_s2 - p_M * p_sum) / (p_n - 1);
ping_av = p_M;
ping_sd = (int) sqrt((double) p_var);
/*
if (errno)
perror("ping_sd sqrt");
*/
}
#endif /* PING */