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Slow down DNS possling in case of no address to resolve

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This commit is contained in:
Luca 2016-12-30 01:48:27 +01:00
parent 91648ca1cd
commit 80daed0e73
1 changed files with 8 additions and 2 deletions
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10
src/AddressResolution.cpp
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@ -130,6 +130,8 @@ void AddressResolution::resolveHostName(char *_numeric_ip, char *symbolic, u_int
static void* resolveLoop(void* ptr) {
AddressResolution *a = (AddressResolution*)ptr;
Redis *r = ntop->getRedis();
u_int no_resolution_loops = 0;
const u_int max_num_idle_loops = 3;
while(!ntop->getGlobals()->isShutdown()) {
char numeric_ip[64];
@ -138,8 +140,12 @@ static void* resolveLoop(void* ptr) {
if(rc == 0) {
if(numeric_ip[0] != '\0')
a->resolveHostName(numeric_ip);
} else
sleep(1);
no_resolution_loops = 0;
} else {
if(no_resolution_loops < max_num_idle_loops) no_resolution_loops++;
sleep(no_resolution_loops);
}
}
return(NULL);