89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <netinet/ip.h>
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#include <arpa/inet.h>
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#include <unistd.h>
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struct ipheader {
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unsigned char iph_ihl:4, iph_ver:4;
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unsigned char iph_tos;
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unsigned short int iph_len;
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unsigned short int iph_ident;
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unsigned short int iph_flag:3, iph_offset:13;
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unsigned char iph_ttl;
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unsigned char iph_protocol;
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unsigned short int iph_chksum;
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struct in_addr iph_sourceip;
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struct in_addr iph_destip;
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};
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struct icmpheader {
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unsigned char icmp_type;
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unsigned char icmp_code;
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unsigned short int icmp_chksum;
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unsigned short int icmp_id;
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unsigned short int icmp_seq;
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};
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unsigned short in_cksum (unsigned short *buf, int length)
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{
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unsigned short *w = buf;
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int nleft = length;
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int sum = 0;
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unsigned short temp=0;
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while (nleft > 1) {
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sum += *w++;
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nleft -= 2;
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}
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if (nleft == 1) {
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*(u_char *)(&temp) = *(u_char *)w ;
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sum += temp;
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}
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sum = (sum >> 16) + (sum & 0xffff);
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sum += (sum >> 16);
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return (unsigned short)(~sum);
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}
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void send_raw_ip_packet(struct ipheader* ip)
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{
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struct sockaddr_in dest_info;
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int enable = 1;
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int sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
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setsockopt(sock, IPPROTO_IP, IP_HDRINCL, &enable, sizeof(enable));
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dest_info.sin_family = AF_INET;
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dest_info.sin_addr = ip->iph_destip;
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sendto(sock, ip, ntohs(ip->iph_len), 0, (struct sockaddr *)&dest_info, sizeof(dest_info));
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close(sock);
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}
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int main() {
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char buffer[1500];
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memset(buffer, 0, 1500);
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struct icmpheader *icmp = (struct icmpheader *)(buffer + sizeof(struct ipheader));
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icmp->icmp_type = 8; // ICMP Echo Request
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icmp->icmp_chksum = 0;
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icmp->icmp_chksum = in_cksum((unsigned short *)icmp, sizeof(struct icmpheader));
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struct ipheader *ip = (struct ipheader *) buffer;
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ip->iph_ver = 4;
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ip->iph_ihl = 5;
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ip->iph_ttl = 20;
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ip->iph_sourceip.s_addr = inet_addr("1.2.3.4");
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ip->iph_destip.s_addr = inet_addr("10.9.0.5");
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ip->iph_protocol = IPPROTO_ICMP;
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ip->iph_len = htons(sizeof(struct ipheader) + sizeof(struct icmpheader));
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send_raw_ip_packet(ip);
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printf("Spoofed ICMP packet sent from 1.2.3.4 to 10.9.0.5\n");
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return 0;
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}
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