#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>int main(){	char *lenstr;	char *string="textfield=";	//char ip[]="ifconfig eth0 ";	char *a;	char arg1[20];	char input[1024];	//char *ip="192.168.18.120";	printf("Content-Type:text/html\n\n");	printf("<TITLE>設(shè)置系統(tǒng)IP地址</TITLE>\n");	printf("<HR>");	lenstr = getenv("CONTENT_LENGTH");	if(!lenstr)	printf("<P>Sorry..\n</P>");	else{	fgets(input,1024,stdin);	//printf("<P>%s\n",input);	if(memcmp(input,string,10)==0){	//printf("<P>find ip\n");	}	a = strstr(input,string);	sscanf(a,"%*[^=]=%[^&]",&arg1);	//printf("%s\n\n",&arg1);	execlp("ifconfig","ifconfig","eth0","192.168.18.118",(char *)0);	printf("<P>您已經(jīng)成功設(shè)置了系統(tǒng)的IP地址！</P>");	printf("<P>您設(shè)置系統(tǒng)的IP地址:%s</P>",arg1);	printf("</br>");	printf("<a href=../sys_form.html>返回首頁</a>");	}		}