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ping.c
165 lines (134 loc) · 4.02 KB
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ping.c
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#include "common.h"
#include "parson.h"
struct list list_pings;
ENetSocket sock, lan;
pthread_t ping_thread;
pthread_mutex_t ping_lock;
void (*ping_finished) ();
void (*ping_result) (void*, float time_delta, void* user_data);
void ping_init() {
list_create(&list_pings,sizeof(struct ping_entry));
sock = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
enet_socket_set_option(sock,ENET_SOCKOPT_NONBLOCK,1);
lan = enet_socket_create(ENET_SOCKET_TYPE_DATAGRAM);
enet_socket_set_option(lan,ENET_SOCKOPT_NONBLOCK,1);
enet_socket_set_option(lan,ENET_SOCKOPT_BROADCAST,1);
pthread_mutex_init(&ping_lock,NULL);
}
void ping_deinit() {
enet_socket_destroy(sock);
enet_socket_destroy(lan);
}
void* ping_update(void* data) {
ping_lan();
float ping_start = window_time();
while(1) {
char tmp[512];
ENetBuffer buf;
buf.data = tmp;
ENetAddress from;
pthread_mutex_lock(&ping_lock);
while(1) {
buf.dataLength = 512;
memset(tmp,0,buf.dataLength);
int response = enet_socket_receive(sock,&from,&buf,1);
if(response!=0) {
struct ping_entry* entry;
int k;
for(k=list_size(&list_pings)-1;k>=0;k--) {
entry = list_get(&list_pings,k);
if(entry->addr.host==from.host && entry->addr.port==from.port)
break;
}
switch(response) {
default: //received something!
if(strcmp(buf.data,"HI")==0) {
ping_result(NULL,window_time()-entry->time_start,entry->user_data);
}
case -1: //connection was closed
list_remove(&list_pings,k);
}
} else { //would block
break;
}
}
int retry = 0;
for(int k=list_size(&list_pings)-1;k>=0;k--) {
struct ping_entry* entry = list_get(&list_pings,k);
if(window_time()-entry->time_start>2.0F) { //timeout
if(entry->trycount<3) { //try up to 3 times after first failed attempt
retry = 1;
ENetBuffer buffer;
buffer.data = "HELLO";
buffer.dataLength = 5;
entry->time_start = window_time();
enet_socket_send(sock,&entry->addr,&buffer,1);
entry->trycount++;
} else {
list_remove(&list_pings,k);
continue;
}
}
}
if(retry)
log_warn("Ping timeout on some server(s), retrying");
buf.dataLength = 512;
memset(tmp,0,buf.dataLength);
int length = enet_socket_receive(lan,&from,&buf,1);
if(length) {
struct serverlist_entry e;
strcpy(e.country,"LAN");
e.ping = ceil((window_time()-ping_start)*1000.0F);
sprintf(e.identifier,"aos://%i:%i",from.host,from.port);
JSON_Value* js = json_parse_string(tmp);
JSON_Object* root = json_value_get_object(js);
strcpy(e.name,json_object_get_string(root,"name"));
strcpy(e.gamemode,json_object_get_string(root,"game_mode"));
strcpy(e.map,json_object_get_string(root,"map"));
e.current = json_object_get_number(root,"players_current");
e.max = json_object_get_number(root,"players_max");
json_value_free(js);
ping_result(&e,window_time()-ping_start,NULL);
}
if(!list_size(&list_pings)) {
ping_finished();
return NULL;
}
pthread_mutex_unlock(&ping_lock);
usleep(1);
}
}
void ping_lan() {
ENetAddress addr;
addr.host = 0xFFFFFFFF; //255.255.255.255
ENetBuffer buffer;
buffer.data = "HELLOLAN";
buffer.dataLength = 8;
for(addr.port=32880;addr.port<32890;addr.port++)
enet_socket_send(lan,&addr,&buffer,1);
}
void ping_check(char* addr, int port, void* user_data) {
pthread_mutex_lock(&ping_lock);
struct ping_entry* entry = list_add(&list_pings,NULL);
strcpy(entry->user_data,user_data);
entry->trycount = 0;
enet_address_set_host(&entry->addr,addr);
entry->addr.port = port;
ENetBuffer buffer;
buffer.data = "HELLO";
buffer.dataLength = 5;
entry->time_start = window_time();
enet_socket_send(sock,&entry->addr,&buffer,1);
pthread_mutex_unlock(&ping_lock);
}
void ping_start(void (*finished) (), void (*result) (void*, float, void*)) {
pthread_create(&ping_thread,NULL,ping_update,NULL);
ping_finished = finished;
ping_result = result;
}
void ping_stop() {
pthread_mutex_lock(&ping_lock);
list_clear(&list_pings);
pthread_cancel(ping_thread);
pthread_mutex_unlock(&ping_lock);
}