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<hr><p align="left"><small>/* icmpmon might be lame piece, but is done more for experimenting <br>
* purposes rather than a something neato :) <br>
* <br>
* will show you all ICMP packets reaching your box, which could be useful <br>
* in detecting attacks/portscans sometimes. <br>
* <br>
* comments: fygrave@tigerteam.net <br>
* flames : postmaster@localhost <br>
* browsers: http://www.kalug.lug.net <br>
*/ <br>
<br>
<br>
/* BSD compatibility */ <br>
#define __USE_BSD <br>
<br>
#include <stdio.h> <br>
#include <unistd.h> <br>
#include <net/if.h> <br>
#include <netinet/in.h> <br>
#include <netinet/ip.h> <br>
#include <netinet/ip_icmp.h> <br>
#include <sys/ioctl.h> <br>
#include <sys/types.h> <br>
#include <sys/socket.h> <br>
#include <arpa/inet.h> <br>
<br>
char *icmppack[]={"ICMP ECHO REPLY","#1","#2","ICMP DEST UNREACHABLE", <br>
"ICMP SOURCE QUENCH","ICMP REDIRECT","#6","#7","ICMP ECHO", <br>
"ROUTER ADVERTISEMENT","ROUTER SOLICITATION","ICMP TIME EXCEEDED", <br>
"ICMP PARAM PROBLEM", <br>
"ICMP TIMESTAMP REQUEST","ICMP INFO REQUEST","ICMP INFO REPLY", <br>
"ICMP ADDRESS","ICMP ADDRESS REPLY"}; <br>
char *icmpunreach[]={"Network unreachable", "host unreachable", <br>
"protocol unreachable", "port unreachable","need fragmentation", <br>
"source routed fialed","net denied","host denied","bad tos for net", <br>
"bad tos for host","filter denied","host precedence violation", <br>
"precedence cutoff"}; <br>
char *icmpredir[]={"Network redirect","host redirect","tos and net redir", <br>
"tos and host redir"}; <br>
char *icmptimex[]={"time exceed in transit","time exceed in reassembly"}; <br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
int sendpack( int s, u_long srcaddr, u_short srcport, u_long dstaddr, u_short ds <br>
tport, u_char *packet) { <br>
<br>
return 0; <br>
} <br>
<br>
int main(argc,argv) <br>
int argc; <br>
char **argv; <br>
{ <br>
int rawfd,rd,rsize; <br>
int one=1; <br>
u_char buf[1024]; <br>
struct sockaddr_in raddr; <br>
struct ip *ip; <br>
struct icmp *icmp; <br>
<br>
if ((rawfd=socket(PF_INET,SOCK_RAW,IPPROTO_ICMP))<0) { <br>
perror("RawSocket:"); <br>
exit(1); <br>
} <br>
} <br>
if (setsockopt(rawfd,IPPROTO_IP,IP_HDRINCL,&one,sizeof(one))<0) { <br>
perror("SetSockOpt:"); <br>
close(rawfd); <br>
exit(1); <br>
} <br>
<br>
<br>
<br>
printf("Listening to ICMP packets\n"); <br>
for(;;) { <br>
fflush(stdout); <br>
if ((rd=recvfrom(rawfd,buf,1024,0,(struct sockaddr *)&raddr,&rsize))<0) break; <br>
ip=(struct ip *)buf; <br>
icmp=(struct icmp *)&buf[ip->ip_hl<<2]; <br>
<br>
<br>
printf("%s packet from: %s ",icmppack[icmp->icmp_type],inet_ntoa(ip->ip_src)); <br>
/* details */ <br>
switch(icmp->icmp_type) { <br>
case ICMP_UNREACH : <br>
printf("[%s]\n",icmpunreach[icmp->icmp_code]); <br>
break; <br>
case ICMP_REDIRECT : <br>
printf("[%s]\n",icmpredir[icmp->icmp_code]); <br>
break; <br>
case ICMP_TIMXCEED : <br>
printf("[%s]\n",icmptimex[icmp->icmp_code]); <br>
break; <br>
default: <br>
printf("\n"); <br>
} <br>
} <br>
close(rawfd); <br>
return 0; <br>
} <br>
</small><hr>
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