af.c

一个基于linux的TCP/IP协议栈的实现

/* af.c
 * [e-mail]
 * 2006-10-20
 */

#include "net-support.h"

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

static short sVafinit = 0;

extern struct aftype unspec_aftype;
extern struct aftype myinet_aftype;

struct aftype *aftypes[] =
{
    &myinet_aftype,
	&unspec_aftype,
	NULL
};

void afinit()
{
	unspec_aftype.title = "UNSPEC";
	myinet_aftype.title = "DARPA Internet";
	sVafinit = 1;
}

struct aftype *get_afntype(int af)
{
	struct aftype **afp;

	if( !sVafinit )
		afinit();

	afp = aftypes;
	while( *afp != NULL ){
		if( (*afp)->af == af )
			return (*afp);
		afp++;
	}
	return ( NULL );
}

int get_socket_for_af(int af)
{
	struct aftype **afp;

	if (!sVafinit)
		afinit();

	afp = aftypes;
	while( *afp != NULL ){
		if ((*afp)->af == af)
			return (*afp)->fd;
		afp++;
	}
	return -1;
}

void print_aflist(int type) {
	int count = 0;
	char * txt;
	struct aftype **afp;

	if (!sVafinit)
		afinit();

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

struct aftype *get_aftype(const char *name)
{
	struct aftype **afp;

	if (!sVafinit)
		afinit();

	afp = aftypes;
	while (*afp != NULL) {
		if( !strcmp((*afp)->name, name) )
			return (*afp);
		afp++;
	}
	if (index(name, ','))
		fprintf(stderr, "Please don't supply more than one address family.\n");
	return (NULL);
}