hw.c

一个基于linux的TCP/IP协议栈的实现

/* hw.c
 * [e-mail]
 * 2006-10-20
 */
#include "net-support.h"

#include <stdio.h>
#include <string.h>

static short sVhwinit = 0;

extern struct hwtype unspec_hwtype;
extern struct hwtype loop_hwtype;
extern struct hwtype ether_hwtype;

static struct hwtype *hwtypes[] =
{
	&loop_hwtype,
	&ether_hwtype,
	&unspec_hwtype,
    NULL
};

void hwinit()
{
	loop_hwtype.title = "Local Loopback";
	unspec_hwtype.title = "UNSPEC";
	ether_hwtype.title = "Ethernet";
	sVhwinit = 1;
}

struct hwtype *get_hwntype(int type)
{
	struct hwtype **hwp;

	if( !sVhwinit )
		hwinit();

	hwp = hwtypes;
	while( *hwp != NULL ){
		if( (*hwp)->type == type )
			return (*hwp);
		hwp++;
	}
	return (NULL);
}

int hw_null_address(struct hwtype *hw, void *ap)
{
	unsigned int i;
	unsigned char *address = (unsigned char *)ap;
	for (i = 0; i < hw->alen; i++)
		if( address[i] )
			return 0;
	return 1;
}

void print_hwlist(int type) {
	int count = 0;
	char * txt;
	struct hwtype **hwp;

	if (!sVhwinit)
		hwinit();

	hwp = hwtypes;
	while( *hwp != NULL ){
		if( ((type == 1) && ((*hwp)->alen == 0)) || ((*hwp)->type == -1) ){
			hwp++; 
			continue;
		}
		if ((count % 3) == 0) fprintf(stderr,count?"\n    ":"    ");
		txt = (*hwp)->name; if (!txt) txt = "..";
		fprintf(stderr,"%s (%s) ",txt,(*hwp)->title);
		count++;
		hwp++;
	}
	fprintf(stderr,"\n");
}

struct hwtype *get_hwtype(const char *name)
{
	struct hwtype **hwp;
	if( !sVhwinit )
		hwinit();

	hwp = hwtypes;
	while( *hwp != NULL ){
		if( !strcmp((*hwp)->name, name) )
			return (*hwp);
		hwp++;
	}
	return (NULL);
}