/* print_dg - print an ICMP datagram */
static void print_dg( char *dg, int len )
{
struct ip *ip;
struct icmp *icmp;
struct hostent *hp;
char *hname;
int hl;
static char *redirect_code[] =
{
"network", "host",
"type-of-service and network", "type-of-service and host"
};
static char *timexceed_code[] =
{
"transit", "reassembly"
};
static char *param_code[] =
{
"IP header bad", "Required option missing"
};
ip = ( struct ip * )dg;
if ( ip->ip_v != 4 )
{
error( 0, 0, "IP datagram not version 4\n" );
return;
}
hl = ip->ip_hl << 2; /* IP header length in bytes */
if ( len < hl + ICMP_MINLEN )
{
error( 0, 0, "short datagram (%d bytes) from %s\n",
len, inet_ntoa( ip->ip_src ) );
return;
}
hp = gethostbyaddr( ( char * )&ip->ip_src, 4, AF_INET );
if ( hp == NULL )
hname = "";
else
hname = hp->h_name;
icmp = ( struct icmp * )( dg + hl ); /* ICMP packet */
printf( "ICMP %s (%d) from %s (%s)\n",
get_type( icmp->icmp_type ),
icmp->icmp_type, hname, inet_ntoa( ip->ip_src ) );
if ( icmp->icmp_type == ICMP_UNREACH )
print_unreachable( icmp );
else if ( icmp->icmp_type == ICMP_REDIRECT )
printf( "\tRedirect for %s\n", icmp->icmp_code <= 3 ?
redirect_code[ icmp->icmp_code ] : "Illegal code" );
else if ( icmp->icmp_type == ICMP_TIMXCEED )
printf( "\tTTL == 0 during %s\n", icmp->icmp_code <= 1 ?
timexceed_code[ icmp->icmp_code ] : "Illegal code" );
/*@.bp*/
else if ( icmp->icmp_type == ICMP_PARAMPROB )
printf( "\t%s\n", icmp->icmp_code <= 1 ?
param_code[ icmp->icmp_code ] : "Illegal code" );
}
void print_dg(char* dg, int len)
{
struct ip *ip;
struct icmp *icmp;
struct hostent *hp;
char *hname;
int hl;
char ip_src[16];
//struct sockaddr_in src_addr;
//memset(&src_addr, 0, sizeof(struct sockaddr_in));
static char *redirect_code[] =
{
"netowrk", "host",
"type-of-service and network",
"type-of-service and host"
};
static char *timexceed_code[] =
{
"transit", "reassembly"
};
static char *param_code[] =
{
"IP header bad", "Required option missing"
};
ip = (struct ip*)dg;
if (ip->ip_v != 4){
printf("IP datagram not version 4.\n");
return;
}
hl = ip->ip_hl << 2; //IP header length in bytes
//printf("ip->ip_src %d\n", ip->ip_src);
inet_ntop(AF_INET, &ip->ip_src, ip_src, sizeof(ip_src));
//printf("ip_src %s\n", ip_src);
if (len < hl + ICMP_MINLEN){
printf("short datagram (%d bytes) from %s.\n", len, ip_src);
return;
}
// hp = gethostbyaddr((char*)&ip->ip_src, 4, AF_INET);
// if (hp == NULL){
// hname = "";
// }
// else {
// hname = hp->h_name;
// }
icmp = (struct icmp*)(dg + hl); //ICMP packet
printf("ICMP %s (icmp_type:%d) from %s\n", get_type(icmp->icmp_type), icmp->icmp_type, ip_src);
if (icmp->icmp_type == ICMP_UNREACH){
print_unreachable(icmp, ip_src);
}
else if (icmp->icmp_type == ICMP_REDIRECT){
printf("\tRedirect for %s\n", icmp->icmp_code <= 3 \
? redirect_code[icmp->icmp_code] : "Illegal code");
}
else if (icmp->icmp_type == ICMP_TIMXCEED){
printf("\tTTL == 0 during %s\n", icmp->icmp_code <= 1 \
? timexceed_code[icmp->icmp_code] : "Illegal code");
}
else if (icmp->icmp_type == ICMP_PARAMPROB){
printf("\t%s\n", icmp->icmp_code <= 1 \
? param_code[icmp->icmp_code] : "Illegal code");
}
}
