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- #include <pthread.h>
- #include <unistd.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <signal.h>
- #include <sys/time.h>
- #include <sys/types.h>
- #include <math.h>
- #include <stropts.h>
- #include <ctype.h>
- #include <errno.h>
- #include <arpa/inet.h>
- #include <netinet/ip.h>
- #include <netinet/udp.h>
- struct DNS_HEADER
- {
- unsigned short id; // identification number
- unsigned char rd :1; // recursion desired
- unsigned char tc :1; // truncated message
- unsigned char aa :1; // authoritive answer
- unsigned char opcode :4; // purpose of message
- unsigned char qr :1; // query/response flag
- unsigned char rcode :4; // response code
- unsigned char cd :1; // checking disabled
- unsigned char ad :1; // authenticated data
- unsigned char z :1; // its z! reserved
- unsigned char ra :1; // recursion available
- unsigned short q_count; // number of question entries
- unsigned short ans_count; // number of answer entries
- unsigned short auth_count; // number of authority entries
- unsigned short add_count; // number of resource entries
- };
- struct QUESTION
- {
- unsigned short qtype;
- unsigned short qclass;
- };
- #pragma pack(push, 1)
- struct R_DATA
- {
- unsigned short type;
- unsigned short _class;
- unsigned int ttl;
- unsigned short data_len;
- };
- #pragma pack(pop)
- struct RES_RECORD
- {
- unsigned char *name;
- struct R_DATA *resource;
- unsigned char *rdata;
- };
- typedef struct
- {
- unsigned char *name;
- struct QUESTION *ques;
- } QUERY;
- volatile int running_threads = 0;
- volatile int found_srvs = 0;
- volatile unsigned long per_thread = 0;
- volatile unsigned long start = 0;
- volatile unsigned long scanned = 0;
- volatile int sleep_between = 0;
- volatile int bytes_sent = 0;
- volatile unsigned long hosts_done = 0;
- FILE *fd;
- void ChangetoDnsNameFormat(unsigned char* dns,unsigned char* host)
- {
- int lock = 0 , i;
- strcat((char*)host,".");
- for(i = 0 ; i < strlen((char*)host) ; i++)
- {
- if(host[i]=='.')
- {
- *dns++ = i-lock;
- for(;lock<i;lock++)
- {
- *dns++=host[lock];
- }
- lock++;
- }
- }
- *dns++='\0';
- }
- void *flood(void *par1)
- {
- running_threads++;
- int thread_id = (int)par1;
- unsigned long start_ip = htonl(ntohl(start)+(per_thread*thread_id));
- unsigned long end = htonl(ntohl(start)+(per_thread*(thread_id+1)));
- unsigned long w;
- int y;
- unsigned char *host = (unsigned char *)malloc(50);
- strcpy((char *)host, ".");
- unsigned char buf[65536],*qname;
- struct DNS_HEADER *dns = NULL;
- struct QUESTION *qinfo = NULL;
- dns = (struct DNS_HEADER *)&buf;
- dns->id = (unsigned short) htons(rand());
- dns->qr = 0;
- dns->opcode = 0;
- dns->aa = 0;
- dns->tc = 0;
- dns->rd = 1;
- dns->ra = 0;
- dns->z = 0;
- dns->ad = 0;
- dns->cd = 0;
- dns->rcode = 0;
- dns->q_count = htons(1);
- dns->ans_count = 0;
- dns->auth_count = 0;
- dns->add_count = htons(1);
- qname =(unsigned char*)&buf[sizeof(struct DNS_HEADER)];
- ChangetoDnsNameFormat(qname , host);
- qinfo =(struct QUESTION*)&buf[sizeof(struct DNS_HEADER) + (strlen((const char*)qname) + 1)];
- qinfo->qtype = htons( 255 );
- qinfo->qclass = htons(1);
- void *edns = (void *)qinfo + sizeof(struct QUESTION)+1;
- memset(edns, 0x00, 1);
- memset(edns+1, 0x29, 1);
- memset(edns+2, 0xFF, 2);
- memset(edns+4, 0x00, 7);
- int sizeofpayload = sizeof(struct DNS_HEADER) + (strlen((const char *)qname)+1) + sizeof(struct QUESTION) + 11;
- int sock;
- if((sock=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))<0) {
- perror("cant open socket");
- exit(-1);
- }
- for(w=ntohl(start_ip);w<htonl(end);w++)
- {
- struct sockaddr_in servaddr;
- bzero(&servaddr, sizeof(servaddr));
- servaddr.sin_family = AF_INET;
- servaddr.sin_addr.s_addr=htonl(w);
- servaddr.sin_port=htons(53);
- sendto(sock,(char *)buf,sizeofpayload,0, (struct sockaddr *)&servaddr,sizeof(servaddr));
- bytes_sent+=24;
- scanned++;
- hosts_done++;
- usleep(sleep_between*1000);
- }
- close(sock);
- running_threads--;
- return;
- }
- void sighandler(int sig)
- {
- fclose(fd);
- printf("\n");
- exit(0);
- }
- void recievethread()
- {
- printf("Started Listening Thread\n");
- int saddr_size, data_size, sock_raw;
- struct sockaddr_in saddr;
- struct in_addr in;
- unsigned char *buffer = (unsigned char *)malloc(65536);
- sock_raw = socket(AF_INET , SOCK_RAW , IPPROTO_UDP);
- if(sock_raw < 0)
- {
- printf("Socket Error\n");
- exit(1);
- }
- while(1)
- {
- saddr_size = sizeof saddr;
- data_size = recvfrom(sock_raw , buffer , 65536 , 0 , (struct sockaddr *)&saddr , &saddr_size);
- if(data_size <0 )
- {
- printf("Recvfrom error , failed to get packets\n");
- exit(1);
- }
- struct iphdr *iph = (struct iphdr*)buffer;
- if(iph->protocol == 17)
- {
- unsigned short iphdrlen = iph->ihl*4;
- struct udphdr *udph = (struct udphdr*)(buffer + iphdrlen);
- unsigned char* payload = buffer + iphdrlen + 8;
- if(ntohs(udph->source) == 53)
- {
- int body_length = data_size - iphdrlen - 8;
- struct DNS_HEADER *dns = (struct DNS_HEADER*) payload;
- if(dns->ra == 1)
- {
- found_srvs++;
- fprintf(fd,"%s . %d\n",inet_ntoa(saddr.sin_addr),body_length);
- fflush(fd);
- }
- }
- }
- }
- close(sock_raw);
- }
- int main(int argc, char *argv[ ])
- {
- if(argc < 6){
- fprintf(stderr, "Invalid parameters!\n");
- fprintf(stdout, "Usage: %s <class a start> <class a end> <outfile> <threads> <scan delay in ms>\n", argv[0]);
- exit(-1);
- }
- fd = fopen(argv[3], "a");
- sleep_between = atoi(argv[5]);
- signal(SIGINT, &sighandler);
- int threads = atoi(argv[4]);
- pthread_t thread;
- pthread_t listenthread;
- pthread_create( &listenthread, NULL, &recievethread, NULL);
- char *str_start = malloc(18);
- memset(str_start, 0, 18);
- str_start = strcat(str_start,argv[1]);
- str_start = strcat(str_start,".0.0.0");
- char *str_end = malloc(18);
- memset(str_end, 0, 18);
- str_end = strcat(str_end,argv[2]);
- str_end = strcat(str_end,".255.255.255");
- start = inet_addr(str_start);
- per_thread = (ntohl(inet_addr(str_end)) - ntohl(inet_addr(str_start))) / threads;
- unsigned long toscan = (ntohl(inet_addr(str_end)) - ntohl(inet_addr(str_start)));
- int i;
- for(i = 0;i<threads;i++){
- pthread_create( &thread, NULL, &flood, (void *) i);
- }
- sleep(1);
- printf("Starting Scan...\n");
- char *temp = (char *)malloc(17);
- memset(temp, 0, 17);
- sprintf(temp, "Found");
- printf("%-16s", temp);
- memset(temp, 0, 17);
- sprintf(temp, "Host/s");
- printf("%-16s", temp);
- memset(temp, 0, 17);
- sprintf(temp, "B/s");
- printf("%-16s", temp);
- memset(temp, 0, 17);
- sprintf(temp, "Running Thrds");
- printf("%-16s", temp);
- memset(temp, 0, 17);
- sprintf(temp, "Done");
- printf("%s", temp);
- printf("\n");
- char *new;
- new = (char *)malloc(16*6);
- while (running_threads > 0)
- {
- printf("\r");
- memset(new, '\0', 16*6);
- sprintf(new, "%s|%-15lu", new, found_srvs);
- sprintf(new, "%s|%-15d", new, scanned);
- sprintf(new, "%s|%-15d", new, bytes_sent);
- sprintf(new, "%s|%-15d", new, running_threads);
- memset(temp, 0, 17);
- int percent_done=((double)(hosts_done)/(double)(toscan))*100;
- sprintf(temp, "%d%%", percent_done);
- sprintf(new, "%s|%s", new, temp);
- printf("%s", new);
- fflush(stdout);
- bytes_sent=0;
- scanned = 0;
- sleep(1);
- }
- printf("\n");
- fclose(fd);
- return 0;
- }
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