icmpcode_v4.c

unix下基于IP协议的TRACE ROUTE 代码程序；C/C++语言

#include	"trace.h"

char *
icmpcode_v4(int code)
{
	switch (code) {
	case  0:	return("network unreachable");
	case  1:	return("host unreachable");
	case  2:	return("protocol unreachable");
	case  3:	return("port unreachable");
	case  4:	return("fragmentation required but DF bit set");
	case  5:	return("source route failed");
	case  6:	return("destination network unknown");
	case  7:	return("destination host unknown");
	case  8:	return("source host isolated (obsolete)");
	case  9:	return("destination network administratively prohibited");
	case 10:	return("destination host administratively prohibited");
	case 11:	return("network unreachable for TOS");
	case 12:	return("host unreachable for TOS");
	case 13:	return("communication administratively prohibited by filtering");
	case 14:	return("host recedence violation");
	case 15:	return("precedence cutoff in effect");
	default:	return("[unknown code]");
	}
}