loopback.c

一个学习SNMP项目：tmoerlan.

/*
 * lib/loopback.c	This file contains the general hardware types.
 *
 * Version:	@(#)loopback.c	1.10	10/07/93
 *
 * Author:	Fred N. van Kempen, <[e-mail]>
 *		Copyright 1993 MicroWalt Corporation
 *
 * Modifications:
 * 1998-07-01 - Arnaldo Carvalho de Melo - GNU gettext instead of catgets
 *
 *		This program is free software; you can redistribute it
 *		and/or  modify it under  the terms of  the GNU General
 *		Public  License as  published  by  the  Free  Software
 *		Foundation;  either  version 2 of the License, or  (at
 *		your option) any later version.
 */
#include "config.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <net/if_arp.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include "net-support.h"
#include "pathnames.h"
#include "intl.h"

/* Display an UNSPEC address. */
static char *
pr_unspec(unsigned char *ptr)
{
  static char buff[64];
  char *pos;
  unsigned int i;

  pos = buff;
  for(i = 0; i < sizeof(struct sockaddr); i++) {
	pos += sprintf(pos, "%02X-", (*ptr++ & 0377));
  }
  buff[strlen(buff) - 1] = '\0';
  return(buff);
}


/* Display an UNSPEC socket address. */
static char *
pr_sunspec(struct sockaddr *sap)
{
  static char buf[64];

  if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
	return strncpy (buf, _("[NONE SET]"), sizeof (buf));
  return(pr_unspec(sap->sa_data));
}


struct hwtype unspec_hwtype = {
  "unspec",	NULL, /*"UNSPEC",*/		-1,		0,
  pr_unspec,	pr_sunspec,		NULL,		NULL
};

struct hwtype loop_hwtype = {
  "loop",	NULL, /*"Local Loopback",*/	255/*ARPHRD_LOOPBACK*/,	0,
  NULL,		NULL,			NULL,		NULL
};