tcp lab almost finished and mitnick lab initialized

2026-05-04 01:06:06 +08:00
parent cbcdae4b75
commit 31394e883b
26 changed files with 980 additions and 0 deletions
--- a/Tcp/Labsetup/volumes/spoofer.c
+++ b/Tcp/Labsetup/volumes/spoofer.c
@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <netinet/ip.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+
+struct ipheader {
+  unsigned char      iph_ihl:4, iph_ver:4;
+  unsigned char      iph_tos;
+  unsigned short int iph_len;
+  unsigned short int iph_ident;
+  unsigned short int iph_flag:3, iph_offset:13;
+  unsigned char      iph_ttl;
+  unsigned char      iph_protocol;
+  unsigned short int iph_chksum;
+  struct  in_addr    iph_sourceip;
+  struct  in_addr    iph_destip;
+};
+
+struct icmpheader {
+  unsigned char icmp_type;
+  unsigned char icmp_code;
+  unsigned short int icmp_chksum;
+  unsigned short int icmp_id;
+  unsigned short int icmp_seq;
+};
+
+unsigned short in_cksum (unsigned short *buf, int length)
+{
+   unsigned short *w = buf;
+   int nleft = length;
+   int sum = 0;
+   unsigned short temp=0;
+
+   while (nleft > 1)  {
+       sum += *w++;
+       nleft -= 2;
+   }
+
+   if (nleft == 1) {
+        *(u_char *)(&temp) = *(u_char *)w ;
+        sum += temp;
+   }
+
+   sum = (sum >> 16) + (sum & 0xffff);
+   sum += (sum >> 16);
+   return (unsigned short)(~sum);
+}
+
+void send_raw_ip_packet(struct ipheader* ip)
+{
+    struct sockaddr_in dest_info;
+    int enable = 1;
+
+    int sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
+    setsockopt(sock, IPPROTO_IP, IP_HDRINCL, &enable, sizeof(enable));
+
+    dest_info.sin_family = AF_INET;
+    dest_info.sin_addr = ip->iph_destip;
+
+    sendto(sock, ip, ntohs(ip->iph_len), 0, (struct sockaddr *)&dest_info, sizeof(dest_info));
+    close(sock);
+}
+
+int main() {
+   char buffer[1500];
+   memset(buffer, 0, 1500);
+
+   struct icmpheader *icmp = (struct icmpheader *)(buffer + sizeof(struct ipheader));
+   icmp->icmp_type = 8; // ICMP Echo Request
+   icmp->icmp_chksum = 0;
+   icmp->icmp_chksum = in_cksum((unsigned short *)icmp, sizeof(struct icmpheader));
+
+   struct ipheader *ip = (struct ipheader *) buffer;
+   ip->iph_ver = 4;
+   ip->iph_ihl = 5;
+   ip->iph_ttl = 20;
+   ip->iph_sourceip.s_addr = inet_addr("1.2.3.4");
+   ip->iph_destip.s_addr = inet_addr("10.9.0.5");
+   ip->iph_protocol = IPPROTO_ICMP;
+   ip->iph_len = htons(sizeof(struct ipheader) + sizeof(struct icmpheader));
+
+   send_raw_ip_packet(ip);
+   printf("Spoofed ICMP packet sent from 1.2.3.4 to 10.9.0.5\n");
+
+   return 0;
+}