forked from QW-Group/ezquake-source
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EX_browser_ping.c
1105 lines (876 loc) · 27.3 KB
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EX_browser_ping.c
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/*
Copyright (C) 2007 ezQuake team
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
$Id: EX_browser_ping.c,v 1.40 2007-10-27 08:51:12 dkure Exp $
*/
#ifdef _WIN32
#include <winsock2.h>
#include "quakedef.h"
#else
#include "quakedef.h"
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <arpa/inet.h>
#include <errno.h>
#include <unistd.h>
#include <semaphore.h>
#define SO_DONTLINGER 0
#define GetCurrentProcessId getpid
#define ioctlsocket ioctl
#endif // _WIN32
#include "hud.h"
#include "hud_common.h"
#include "EX_browser.h"
// =============================================================================
// Constants
// =============================================================================
#define ICMP_ECHO 8
#define ICMP_ECHOREPLY 0
#define ICMP_MIN 8 // minimum 8 byte icmp packet (just header)
#define STATUS_FAILED 0xFFFF
#define DEF_PACKET_SIZE 0
#define MAX_PACKET 1024
#define PING_PACKET_DATA "\xff\xff\xff\xffk\n"
// =============================================================================
// Local Types
// =============================================================================
/* The IP header */
typedef struct IP_header_s
{
unsigned int h_len:4; // length of the header
unsigned int version:4; // Version of IP
unsigned char tos; // Type of service
unsigned short total_len; // total length of the packet
unsigned short ident; // unique identifier
unsigned short frag_and_flags; // flags
unsigned char ttl;
unsigned char proto; // protocol (TCP, UDP etc)
unsigned short checksum; // IP checksum
unsigned int sourceIP;
unsigned int destIP;
} IP_header_t;
typedef struct ICMP_header_s
{
byte i_type;
byte i_code; /* type sub code */
unsigned short i_cksum;
unsigned short i_id;
unsigned short i_seq;
/* This is not the std header, but we reserve space for our needs */
double timestamp;
u_int id; // ip
int index; // server num
int phase; // ping phase
int randomizer;
} ICMP_header_t;
/* Packets */
typedef union IP_Packet_u {
IP_header_t hdr;
byte data[MAX_PACKET];
} IP_packet_t;
typedef union ICMP_Packet_u {
ICMP_header_t hdr;
byte data[MAX_PACKET];
} ICMP_packet_t;
/* Struct for storing ping reponses */
typedef struct pinghost_s
{
int ip;
unsigned short port;
int recv, send;
int phase;
double ping;
double stime[6];
} pinghost_t;
typedef struct {
pinghost_t *hosts;
int nelms;
} pinghost_list_t;
// =============================================================================
// Function Prototypes
// =============================================================================
// =============================================================================
// Global variables
// =============================================================================
qbool useNewPing = false; // New Ping = UDP QW Packet multithreaded ping
socket_t sock;
socket_t ping_sock;
/* Used for thread syncronisation */
static qbool ping_finished = false;
static sem_t ping_semaphore;
// =============================================================================
// Local Functions
// =============================================================================
/**
* Given a string of the form "ip:port", gets the addr, port in integer format
*/
static int ParseServerIp(char *server_port, int *addr, unsigned short *port)
{
char server_ip[50];
char *port_divide;
strlcpy (server_ip, server_port, sizeof(server_ip));
/* Break the ip at the port */
if ((port_divide = strchr(server_ip, ':')))
*port_divide = 0;
if (addr) {
*addr = inet_addr(server_ip);
if (*addr == INADDR_NONE)
return 1;
}
if (port)
{
if (port_divide != NULL)
*port = (unsigned short) Q_atoi(port_divide+1);
else
*port = 27500;
}
return 0;
}
/**
* Given a servs list, parse and create a pinghost_t list from it
*/
static pinghost_t *ParseServerList(server_data *servs[], int servsn, int *host_nelms)
{
pinghost_t *phosts;
int nelms;
int i, j;
phosts = (pinghost_t *)Q_malloc(sizeof(pinghost_t) * servsn);
nelms = 0;
for (i=0; i < servsn; i++)
{
int addr;
unsigned short port;
if (ParseServerIp(servs[i]->display.ip, &addr, &port))
{
continue;
}
/* Make sure it is unique */
for (j = 0; j < nelms; j++)
{
if (phosts[j].ip == addr && phosts[j].port == port)
{
break;
}
}
if (j == nelms)
{
phosts[nelms].recv = 0;
phosts[nelms].send = 0;
phosts[nelms].ping = 0;
phosts[nelms].ip = addr;
phosts[nelms].port = port;
nelms++;
}
}
*host_nelms = nelms;
return phosts;
}
/**
* Given a ping host array takes the average ping and fills the display for
* the servs array
*/
static void FillServerListPings(server_data *servs[], int servsn,
pinghost_t *phosts, int host_nelms) {
int i, j;
for (i = 0; i < host_nelms; i++) {
int ping;
int addr;
unsigned short port;
/* Take the average of the recieved pings */
if (phosts[i].recv > 0)
ping = (int)((phosts[i].ping / phosts[i].recv) * 1000);
else
ping = -1;
/* Find the server from the host */
for (j = 0; j < servsn; j++)
{
if (ParseServerIp(servs[j]->display.ip, &addr, &port))
{
continue;
}
if (addr == phosts[i].ip && port == phosts[i].port)
{
SetPing(servs[j], ping); // 10
}
}
}
}
/**
* Decode an IP packet and return the underlying ICMP header
*/
static ICMP_header_t *IP_DecodePacket(IP_packet_t *ip_packet, int bytes,
struct sockaddr_in *from, u_int ip)
{
ICMP_packet_t *icmp_packet;
unsigned short iphdrlen;
iphdrlen = ip_packet->hdr.h_len * 4 ; // number of 32-bit words *4 = bytes
if (bytes < iphdrlen + ICMP_MIN)
{
return NULL;
}
icmp_packet = (ICMP_packet_t *)(ip_packet->data + iphdrlen);
if (icmp_packet->hdr.i_type != ICMP_ECHOREPLY)
{
return NULL;
}
if (icmp_packet->hdr.i_id != (unsigned short)GetCurrentProcessId())
{
return NULL;
}
return &icmp_packet->hdr;
}
/**
* Decode an ICMP packet and calculate the total return trip time (RTT) is ms
*/
static int ICMP_GetEchoResponseTime(ICMP_header_t *icmp_hdr)
{
return 1 + (int)((Sys_DoubleTime() - icmp_hdr->timestamp)*1000);
}
/**
* Calculate the ICMP checksum which includes the header and data
*/
static unsigned short ICMP_Checksum(ICMP_packet_t *packet, int size)
{
unsigned int cksum=0;
unsigned short *buffer = (unsigned short *)packet->data;
while(size >1)
{
cksum+=*buffer++;
size -=sizeof(unsigned short);
}
if (size)
{
cksum += *(byte *)buffer;
}
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >>16);
return (unsigned short)(~cksum);
}
/**
* Helper function to fill in various stuff in our ICMP request.
*/
static void ICMP_FillData(ICMP_packet_t *packet, int datasize)
{
packet->hdr.i_type = ICMP_ECHO;
packet->hdr.i_code = 0;
packet->hdr.i_id = (unsigned short)GetCurrentProcessId();
packet->hdr.i_cksum = 0;
packet->hdr.i_seq = 0;
//
// Place some junk in the buffer.
//
memset(packet->data + sizeof(packet->hdr), 'E', datasize);
}
// =============================================================================
// Global Functions
// =============================================================================
void SB_RootInit(void)
{
useNewPing = true;
}
/**
* Pings a single host up to count attempts, each attemp we send the request
* and wait for the reply. The total return trip time (RTT) in ms is returned.
*/
int oldPingHost(char *host_to_ping, int count)
{
struct sockaddr_in dest, from;
int fromlen = sizeof(from);
int bread, datasize;
ICMP_packet_t icmp_packet;
IP_packet_t ip_recv_packet;
ICMP_header_t *icmp_recv_header;
int attempts, rtt;
struct timeval timeout;
fd_set fd_set_struct;
unsigned int addr=0;
unsigned short seq_no = 0;
if (sock < 0)
return 0;
addr = inet_addr(host_to_ping);
if (addr == INADDR_NONE)
return 0;
memset(&dest, 0, sizeof(dest));
dest.sin_addr.s_addr = addr;
dest.sin_family = AF_INET;
memset(icmp_packet.data, 0, sizeof(icmp_packet.data));
datasize = DEF_PACKET_SIZE;
datasize += sizeof(icmp_packet.hdr);
ICMP_FillData(&icmp_packet, datasize);
attempts = 0;
rtt = 0;
while (attempts < count)
{
int bwrote;
int ret;
attempts++;
/* Prepare the packet */
icmp_packet.hdr.i_cksum = 0;
icmp_packet.hdr.timestamp = Sys_DoubleTime();
icmp_packet.hdr.id = addr;
icmp_packet.hdr.i_seq = seq_no++;
icmp_packet.hdr.i_cksum = ICMP_Checksum(&icmp_packet, datasize);
/* Prepare for response */
FD_ZERO(&fd_set_struct);
FD_SET(sock, &fd_set_struct);
timeout.tv_sec = 0;
timeout.tv_usec = sb_pingtimeout.value * 1000;
ret = select(sock+1, NULL, (fd_set *) &fd_set_struct, NULL, &timeout);
if (ret <= 0)
continue;
/* Send ping request */
bwrote = sendto(sock, (char *) icmp_packet.data,datasize,0,
(struct sockaddr*)&dest, sizeof(dest));
if (bwrote <= 0 || bwrote < datasize)
continue;
/* Wait for response */
FD_ZERO(&fd_set_struct);
FD_SET(sock, &fd_set_struct);
ret = select(sock+1, (fd_set *) &fd_set_struct, NULL, NULL, &timeout);
if (ret <= 0)
continue;
bread = recvfrom(sock, (char *) ip_recv_packet.data, MAX_PACKET, 0,
(struct sockaddr*)&from, (socklen_t *)&fromlen);
if (bread <= 0)
continue;
/* Look for the RTT */
icmp_recv_header = IP_DecodePacket(&ip_recv_packet, bread, &from, addr);
if (icmp_recv_header) {
if (!(rtt = ICMP_GetEchoResponseTime(icmp_recv_header))) {
continue;
}
}
break;
}
return rtt;
}
/**
* Ping multiple hosts listed by servs, ping each host count times
*/
int oldPingHosts(server_data *servs[], int servsn, int count)
{
double interval;
double lastsenttime;
int ping_number;
int randomizer;
pinghost_list_t host_list;
struct sockaddr_in dest,from;
int bread,datasize;
int fromlen = sizeof(from);
ICMP_packet_t icmp_packet;
IP_packet_t ip_packet;
int success;
struct timeval timeout;
fd_set fd_set_struct;
unsigned int addr=0;
unsigned short seq_no = 0;
if (sock < 0)
return 0;
datasize = DEF_PACKET_SIZE;
datasize += sizeof(icmp_packet.hdr);
// FIXME: The datasize only sizeof(IcmpHeader) here so fill_icmp_data won't set any of the data "to junk", it will all be 0.
memset(icmp_packet.data, 0, MAX_PACKET);
ICMP_FillData(&icmp_packet, datasize);
success = 0;
host_list.hosts = ParseServerList(servs, servsn, &host_list.nelms);
interval = (1000.0 / sb_pingspersec.value) / 1000;
lastsenttime = Sys_DoubleTime() - interval;
timeout.tv_sec = 0;
timeout.tv_usec = (long)(interval * 1000.0 * 1000.0);
ping_number = 0;
randomizer = (int)(Sys_DoubleTime() * 10);
// Ping all addresses in the host list we just created.
while (!abort_ping)
{
int bwrote;
double time = Sys_DoubleTime();
if (time > (lastsenttime + 1.2 * (sb_pingtimeout.value / 1000)))
{
// No answers, no pings - finish.
break;
}
// Send a ping request to the current host.
if ((time > (lastsenttime + interval))
&& (ping_number < (host_list.nelms * sb_pings.value)))
{
// Send next ping.
pinghost_t * host = &host_list.hosts[ping_number % host_list.nelms];
if (host->ping >= 0)
{
icmp_packet.hdr.i_cksum = 0;
icmp_packet.hdr.timestamp = time;
icmp_packet.hdr.id = host->ip;
icmp_packet.hdr.index = ping_number % host_list.nelms;
icmp_packet.hdr.phase = ping_number;
icmp_packet.hdr.randomizer = randomizer;
icmp_packet.hdr.i_seq = seq_no++;
icmp_packet.hdr.i_cksum = ICMP_Checksum(&icmp_packet, datasize);
memset(&dest, 0, sizeof(dest));
dest.sin_addr.s_addr = host->ip;
dest.sin_family = AF_INET;
bwrote = sendto(sock, (char *) icmp_packet.data, datasize, 0,
(struct sockaddr*)&dest, sizeof(dest));
if (bwrote <= 0 || bwrote < datasize)
host->ping = -1;
lastsenttime = time;
}
ping_number++;
ping_pos = min(1, ping_number
/ (double)(host_list.nelms * sb_pings.value));
}
// Wait for an answer.
while (!abort_ping)
{
int myvar;
ICMP_header_t *icmp_answer;
FD_ZERO(&fd_set_struct);
FD_SET(sock, &fd_set_struct);
myvar = select(sock+1, (fd_set *) &fd_set_struct, NULL,
NULL, &timeout);
if (myvar <= 0)
break;
// there's an answer - get it!
bread = recvfrom(sock, (char *) ip_packet.data, sizeof(ip_packet.data), 0,
(struct sockaddr *)&from, (socklen_t *)&fromlen);
if (bread <= 0)
continue;
icmp_answer = IP_DecodePacket(&ip_packet, bread, &from, addr);
// Make sure the reply is ok.
if (icmp_answer && (randomizer == icmp_answer->randomizer))
{
int index;
int fromhost;
fromhost = icmp_answer->id;
index = icmp_answer->index;
if ((host_list.hosts[index].ip == fromhost)
&& (host_list.hosts[index].ping >= 0))
{
host_list.hosts[index].ping
= (host_list.hosts[index].ping
* host_list.hosts[index].phase
+ (Sys_DoubleTime()-icmp_answer->timestamp))
/ (host_list.hosts[index].phase + 1);
host_list.hosts[index].phase++;
// Remove averaging that would occur in FillServerListPings
host_list.hosts[index].recv = 1;
}
}
}
}
// update pings in our servz
if (!abort_ping) {
FillServerListPings(servs, servsn, host_list.hosts, host_list.nelms);
}
Q_free(host_list.hosts);
return success;
}
/**
* Pings multiple hosts in parrallel, each host is pingged count times
*/
void PingSendParrallelMultiHosts(pinghost_t *phosts, int nelms, int count) {
struct sockaddr_in to;
int interval;
int i, j;
int ret;
timerresolution_session_t timer_session;
memset(&timer_session, 0, sizeof(timer_session));
count = bound(1, count, 6);
interval = 1000.0 / sb_pingspersec.integer;
Sys_TimerResolution_InitSession(&timer_session);
Sys_TimerResolution_RequestMinimum(&timer_session);
for (i = 0; i < count && !abort_ping; i++) {
for (j = 0; j < nelms && !abort_ping; j++) {
char *packet = PING_PACKET_DATA;
ping_pos = min(1, (j / (double)(nelms * count))) + (i / (double)count);
to.sin_family = AF_INET;
to.sin_port = htons(phosts[j].port);
to.sin_addr.s_addr = phosts[j].ip;
ret = sendto(ping_sock, packet, strlen(packet), 0, (struct sockaddr *)&to, sizeof(struct sockaddr));
if (ret == -1) {
continue;
}
phosts[j].stime[phosts[j].send] = Sys_DoubleTime();
phosts[j].send++;
Sys_MSleep(interval);
}
}
Sys_TimerResolution_Clear(&timer_session);
}
/**
* Thread entry point for parrallel recving of ping responses
*/
int PingRecvProc(void *lpParameter)
{
socklen_t inaddrlen;
struct sockaddr_in from;
fd_set fd;
int k, ret;
struct timeval timeout;
pinghost_list_t *host_list = (pinghost_list_t *)lpParameter;
while (!ping_finished && !abort_ping) {
FD_ZERO(&fd);
FD_SET(ping_sock, &fd);
timeout.tv_sec = 0;
timeout.tv_usec = 100 * 1000;
ret = select(ping_sock+1, &fd, NULL, NULL, &timeout);
if (ret <= 0) // error or timeout
continue;
while (1) {
char buf[16];
inaddrlen = sizeof(struct sockaddr_in);
ret = recvfrom(ping_sock, buf, sizeof(buf), 0, (struct sockaddr *)&from, &inaddrlen);
if (ret <= 0) // socket is asynch, so most likely this means there is no data to read
break;
if (buf[0] != 'l') // not A2A_ACK
continue;
for (k = 0; k < host_list->nelms; k++) {
if (host_list->hosts[k].ip == (int) from.sin_addr.s_addr &&
host_list->hosts[k].port == ntohs(from.sin_port)) {
host_list->hosts[k].ping += Sys_DoubleTime()
- host_list->hosts[k]
.stime[host_list->hosts[k].recv];
host_list->hosts[k].recv++;
break;
}
}
}
}
Sys_SemPost(&ping_semaphore);
return 0;
}
/**
* Ping a single host count times, returns the average of the responses
*/
int PingHost(char *host_to_ping, unsigned short port, int count, int time_out)
{
socket_t sock;
int i, ret, pings;
struct sockaddr_in addr_to, addr_from;
struct timeval timeout;
fd_set fd;
char *packet = "\xff\xff\xff\xffk\n", buf[16]; // A2A_PING, should return A2A_ACK
socklen_t inaddrlen;
double ping, t1;
addr_to.sin_addr.s_addr = inet_addr(host_to_ping);
if (addr_to.sin_addr.s_addr == INADDR_NONE)
return 0;
addr_to.sin_family = AF_INET;
addr_to.sin_port = htons(port);
sock = UDP_OpenSocket(PORT_ANY);
pings = ping = 0;
for (i = 0; i < count; i++) {
ret = sendto(sock, packet, strlen(packet), 0, (struct sockaddr *)&addr_to, sizeof(struct sockaddr));
if (ret == -1) // failure, try again
continue;
t1 = Sys_DoubleTime();
_select:
FD_ZERO(&fd);
FD_SET(sock, &fd);
timeout.tv_sec = 0;
timeout.tv_usec = 1000 * time_out;
ret = select(sock+1, &fd, NULL, NULL, &timeout);
if (ret <= 0) // timed out or error
continue;
inaddrlen = sizeof(struct sockaddr_in);
ret = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *)&addr_from, &inaddrlen);
if (ret == -1) // failure, try again
continue;
if (addr_from.sin_addr.s_addr != addr_to.sin_addr.s_addr) // martian, discard and see if a valid response came in after it
goto _select;
if (buf[0] != 'l') // not A2A_ACK, discard and see if a valid response came in after it
goto _select;
ping += Sys_DoubleTime() - t1;
pings++;
}
closesocket(sock);
return pings ? (int)((ping * 1000) / pings) : 0;
}
/**
* Send several ping requests at once, start another thread to recieve
* the responses.
* FIXME: error handling is in rly bad shape
*/
int PingHosts(server_data *servs[], int servsn, int count)
{
u_int arg;
pinghost_list_t host_list;
host_list.hosts = ParseServerList(servs, servsn, &host_list.nelms);
ping_finished = false;
ping_sock = UDP_OpenSocket(PORT_ANY);
#ifndef _WIN32
if ((fcntl (ping_sock, F_SETFL, O_NONBLOCK)) == -1) { // O'Rly?! @@@
Com_Printf ("TCP_OpenStream: fcntl: (%i): %s\n", qerrno, strerror(qerrno));
//closesocket(ping_sock);
}
#endif
arg = 1;
if (ioctlsocket (ping_sock, FIONBIO, (u_long *)&arg) == -1) { // make asynchronous
Com_Printf ("PingHosts: ioctl: (%i): %s\n", qerrno, strerror(qerrno));
//closesocket(newsocket);
}
Sys_SemInit(&ping_semaphore, 0, 1);
if (Sys_CreateDetachedThread(PingRecvProc, (void *)&host_list) < 0) {
Com_Printf("Failed to create Ping receiver thread\n");
}
PingSendParrallelMultiHosts(host_list.hosts, host_list.nelms, count);
Sys_MSleep(500); // Wait for slow pings
ping_finished = true; // let thread know we are done
Sys_SemWait(&ping_semaphore);
Sys_SemDestroy(&ping_semaphore);
closesocket(ping_sock);
if (!abort_ping) {
FillServerListPings(servs, servsn, host_list.hosts, host_list.nelms);
}
Q_free(host_list.hosts);
return 1;
}
//
// ----------------------------------------------
// connection test
// netgraph + ping stats
//
//
int sb_test_starttime;
int sb_test_incoming_sequence, sb_test_outgoing_sequence;
int sb_test_packet_latency[NET_TIMINGS];
double sent_time[NET_TIMINGS];
double received_time[NET_TIMINGS];
int sequence_latency[NET_TIMINGS];
unsigned int sb_test_addr;
int sb_test_pl;
int sb_test_min, sb_test_max, sb_test_avg, sb_test_dev;
double last_stats_time;
server_data *sb_test_server = NULL;
void SB_Test_GetPackets(void)
{
struct sockaddr_in dest,from;
int bread;
int fromlen = sizeof(from);
IP_packet_t ip_packet;
// int bwrote;
// u_long arg;
// int arg2, success;
// struct timeval timeout;
// fd_set fd_set_struct;
unsigned int addr=0;
// unsigned short seq_no = 0;
if (sock < 0)
return;
memset(&dest, 0, sizeof(dest));
addr = sb_test_addr;
if (addr == INADDR_NONE)
return;
dest.sin_addr.s_addr = addr;
dest.sin_family = AF_INET;
while (1)
{
// int success;
ICMP_header_t *icmp_answer;
int seq;
bread = recvfrom(sock, (char *) ip_packet.data, sizeof(ip_packet.data), 0,
(struct sockaddr*)&from, (socklen_t *) &fromlen);
if (bread <= 0)
break;
icmp_answer = IP_DecodePacket(&ip_packet, bread, &from, addr);
if (!icmp_answer || icmp_answer->phase != sb_test_starttime)
continue;
seq = icmp_answer->i_seq;
if (seq > sb_test_incoming_sequence)
{
received_time[seq%NET_TIMINGS] = cls.realtime;
sequence_latency[seq%NET_TIMINGS] = sb_test_outgoing_sequence - seq;
sb_test_incoming_sequence = seq;
}
}
}
void SB_Test_SendPacket(void)
{
struct sockaddr_in dest/*,from*/;
// int bread,
int datasize;
// int fromlen = sizeof(from);
ICMP_packet_t icmp_packet;
// int ret;
//u_long arg;
//int arg2, success;
//struct timeval timeout;
//fd_set fd_set_struct;
unsigned int addr=0;
// unsigned short seq_no = 0;
sent_time[sb_test_outgoing_sequence%NET_TIMINGS] = cls.realtime;
received_time[sb_test_outgoing_sequence%NET_TIMINGS] = -1; // no answer yet
if (sock < 0)
return ;
memset(&dest, 0, sizeof(dest));
addr = sb_test_addr;
if (addr == INADDR_NONE)
return;
dest.sin_addr.s_addr = addr;
dest.sin_family = AF_INET;
datasize = DEF_PACKET_SIZE;
datasize += sizeof(icmp_packet.hdr);
memset(icmp_packet.data, 0, MAX_PACKET);
ICMP_FillData(&icmp_packet, datasize);
icmp_packet.hdr.phase = sb_test_starttime;
icmp_packet.hdr.i_cksum = 0;
icmp_packet.hdr.timestamp = cls.realtime;
icmp_packet.hdr.id = addr;
icmp_packet.hdr.i_seq = sb_test_outgoing_sequence++;
icmp_packet.hdr.i_cksum = ICMP_Checksum(&icmp_packet, datasize);
sendto(sock, (char *) icmp_packet.data,datasize,0,(struct sockaddr*)&dest,
sizeof(dest));
}
void SB_Test_CalcNet(void)
{
int i, a;
extern hud_t * hud_netgraph;
cvar_t *netgraph_inframes = HUD_FindVar(hud_netgraph, "inframes");
for (i=0; i < NET_TIMINGS; i++)
{
if (received_time[i] == -1)
sb_test_packet_latency[i] = 9999; // dropped
else
{
double l;
if (netgraph_inframes->value) // [frames]
l = 2*(sequence_latency[i]);
else // [miliseconds]
l = min((received_time[i] - sent_time[i])*1000, 1000);
sb_test_packet_latency[i] = (int)l;
}
}
if (last_stats_time +1 < cls.realtime)
{
int count;
double sum;
double avg;
int i;
last_stats_time = cls.realtime;
// recalculate statistics
sb_test_min = 9999999;
sb_test_max = 0;
sum = 0;
count = 0;
for (i=sb_test_outgoing_sequence-NET_TIMINGS; i < sb_test_incoming_sequence; i++)
{
int a = i % NET_TIMINGS;
double ping;
if (i < 0)
continue;
if (received_time[a] == -1)
continue;
ping = (received_time[a] - sent_time[a]) * 1000;
if (ping < sb_test_min)
sb_test_min = ping;
if (ping > sb_test_max)
sb_test_max = ping;
sum += ping;
count++;
}
if (count > 0)
{
avg = (sum / count);
sb_test_avg = (int)(avg + 0.5);
// standard deviation
sum = 0;
for (i=sb_test_outgoing_sequence-NET_TIMINGS; i < sb_test_incoming_sequence; i++)
{
int a = i % NET_TIMINGS;
double ping;