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This commit is contained in:
Lauri Kasanen 2021-12-06 13:41:07 +02:00
parent bb364badd3
commit 49174b1586
1 changed files with 21 additions and 0 deletions
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21
common/network/Blacklist.cxx
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@ -24,6 +24,8 @@
#include <errno.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <pthread.h>
#include <stdlib.h>
#include <time.h>
#include <map>
@ -35,6 +37,9 @@
static std::map<std::string, unsigned> hits;
static std::map<std::string, time_t> blacklist;
static pthread_mutex_t hitmutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t blmutex = PTHREAD_MUTEX_INITIALIZER;
unsigned char bl_isBlacklisted(const char *addr) {
const unsigned char count = blacklist.count(addr);
if (!count)
@ -43,19 +48,35 @@ unsigned char bl_isBlacklisted(const char *addr) {
const time_t now = time(NULL);
const unsigned timeout = rfb::Blacklist::initialTimeout;
if (pthread_mutex_lock(&blmutex))
abort();
if (now - timeout > blacklist[addr]) {
blacklist.erase(addr);
pthread_mutex_unlock(&blmutex);
if (pthread_mutex_lock(&hitmutex))
abort();
hits.erase(addr);
pthread_mutex_unlock(&hitmutex);
return 0;
} else {
blacklist[addr] = now;
pthread_mutex_unlock(&blmutex);
return 1;
}
}
void bl_addFailure(const char *addr) {
if (pthread_mutex_lock(&hitmutex))
abort();
const unsigned num = ++hits[addr];
pthread_mutex_unlock(&hitmutex);
if (num >= (unsigned) rfb::Blacklist::threshold) {
if (pthread_mutex_lock(&blmutex))
abort();
blacklist[addr] = time(NULL);
pthread_mutex_unlock(&blmutex);
}
}