ip地址的合法性及子网判断

实验九:IP地址的合法性及子网判断#include <iostream.h>#include <string.h>#include <stdlib.h>#include <ctype.h>//类结构class ipTest{char ip[15]; //定义ip数组，存放ip地址char subnetPlusMask[18]; //定义subnetPlusMask数组，存放子网号和子网掩码中1的个数char subnet[18]; //定义subnet数组，存放子网号char TempIp[15]; //定义TempIp数组，存放临时的ip地址char TempSub[18]; //定义TempSub数组，存放临时的子网号int mask; //定义整型mask，存放子网掩码中1的个数bool maskIsValid;//定义布尔值maskIsValid，存放判断mask真值的变量public:ipTest(char *,char *); //定义ipTest函数ipTest(){};bool NoIllegalChar(char *); //非法字符的判断bool ipIsValid(char *); //判断IP地址是否合法bool subnetIsValid(char *); //判断子网号是否合法void belong(); //判断IP是否为子网成员print();//定义输出函数print};//主函数void main(int argc,char *argv[]){if(argc != 3){ //判断参数格式是否正确cout <<"Please input command: ip_test subnet/mask ip" ;return;}else{if(strlen(argv[1]) > 18){ //先判断最简单的错误，子网号及子网掩码长度和是否超出cout <<"subnet/mask is too long";return;}if(strlen(argv[2]) > 15){ //ip地址长度是否超出cout<<"ip Address is too long";return;}ipTest test(argv[1],argv[2]); //实例化ipTest类test.print(); //完成相应判别并输出结果}}//构造函数ipTest::ipTest(char* subnetPlusMask,char *ip){maskIsValid = true;char temp[2];//把'/'前的字符复制到subnet字符数组中int smLen = strlen(subnetPlusMask); // 定义smLen为subnetPlusMask的长度for(int i = 0;i < smLen && subnetPlusMask[i] != '/';i++){this->subnet[i] = subnetPlusMask[i]; //对subnet数组赋值，值为subnetPlusMask中的数值this->TempSub[i] = subnetPlusMask[i]; //对TempSub数组赋值，值为subnetPlusMask 中的数值}subnet[i] = '\0';//给数组加上结束符TempSub[i] = '\0'; //给数组加上结束符if(i >= smLen-2){ //初始化mask和maskIsValidif(i == smLen-2){temp[0] = subnetPlusMask[i+1];if(!isdigit(temp[0])) //判断temp中的值是否为字符maskIsValid = false;}else{if(i == smLen-3){temp[0] = subnetPlusMask[i+1];temp[1] = subnetPlusMask[1+2];if(!(isdigit(temp[0])&&isdigit(temp[1]))) //判断temp中的值是否为字符maskIsValid = false;}}mask = atoi(temp); //将temp中的字符数值化if(mask <0 || mask >32) //判断mask值是否超出范围maskIsValid = false;}else //用十进制数表示的掩码中1的个数只能是一位数或者两位数maskIsValid = false;strcpy(this->subnetPlusMask,subnetPlusMask); //给subnetPlusMask赋值strcpy(this->ip,ip); //给IP赋值strcpy(this->TempIp,ip);}//调用判别函数，并输出结果ipTest::print(){bool subIsV = subnetIsValid(TempSub);bool ipIsV = ipIsValid(TempIp);//判断子网是否合法if(!subIsV)cout <<"subnet is invalid!" <<endl;elsecout <<"valid subnet:" <<subnet <<endl;//判断掩码是否合法if(!maskIsValid)cout <<"mask is invalid!" <<endl;elsecout <<"valid mask:" <<mask <<endl;//判断ip地址是否合法if(!ipIsV)cout <<"Ip address is invalid!" <<endl;elsecout <<"valid ip address:" <<ip <<endl;//判断ip地址是否属于子网if(subIsV && ipIsV && maskIsValid)belong();}//子网数，判断输入是否含有非数字字符bool ipTest::NoIllegalChar(char *ch){unsigned int i,k=0;for(i=0;i <strlen(ch);i++)if(isdigit(*(ch+i))==0)//判断每一位是否为数字字符return false;return true; //若不含有非法数字字符则返回true}//判别IP地址是否合法bool ipTest::ipIsValid(char * ip){char ch[]="."; //分隔符char *token,*dot[4];int iplen = 0;token = strtok(ip,ch); //以"."标志将IP字符串按节分开while(token!=NULL){ //循环进行，直到结束dot[iplen]=token; //将分开的每段赋值给dotiplen++;token = strtok(NULL,ch);}//判断IP地址的段数if(iplen != 4) //段数不对return false;for(int i = 0; i < 4; i++)if(!NoIllegalChar(dot[i])||atoi(dot[i])>255) //有非法字符或某段值非法return false;return true;}//判断子网号是否合法bool ipTest::subnetIsValid(char* subnet){if(!ipIsValid(subnet)) //调用判别IP地址合法性的函数return false;return true;}//判断IP是否为子网成员，判断子网号与掩码是否匹配，以及子网号、主机号全0全1问题void ipTest::belong(){int subLen = strlen(subnet);int ipLen = strlen(ip);unsigned int iIPA,iSubA,iMask;unsigned char subA[4],ipA[4];char temp[3];int i,j,t = 0;for (i = 0, j= 0;i <subLen;i++){//不用检错if(subnet[i]!='.')temp[j++]=subnet[i]; //temp数组中放'.'间的串else{subA[3-t] = atoi(temp); //subA数组中放'.'间的数据j=0;t++;temp[0]=temp[1]=temp[2]='\0';}}subA[0]=atoi(temp);temp[0]=temp[1]=temp[2]='\0';iSubA=*(unsigned int *)subA; //iSubA中放subnet中'.'除外的串对应的数for(i=0,j=0,t=0;i <ipLen;i++){ //不用再检错if(ip[i]!='.')temp[j++]=ip[i];else{ipA[3-t]=atoi(temp);j=0;t++;temp[0]=temp[1]=temp[2]='\0';}}ipA[0]=atoi(temp);iIPA=*(unsigned int*)ipA; //iIPA中放IP中'.'除外的串对应的数//获得掩码iMask = 0xffffffff;iMask <<=(32-mask);if((iSubA | iMask)!= iMask){ //说明sub与mask不匹配cout <<"subnet and mask not match!" ;return;}if((iSubA^iMask)==0){ //说明子网号全1cout <<"subnet is all 1!" ;return;}if((iSubA&iMask)==0){ //说明子网号全0cout <<"subnet is all 0!" ;return;}if((iSubA)==(iIPA&iMask)){//IP和掩码与，结果和子网号比较if((iIPA|iMask)==iMask){//说明主机号全0cout <<"Ip address is all 0!" ;return;}if((iIPA|iMask)==0xffffffff){//说明主机号全1cout <<"Ip address is all 1!";return;}//ip属于subnetcout <<" " <<ip <<" belongs to " <<subnetPlusMask <<endl;return;}//ip不属于subnetelsecout <<" " <<ip <<" doesn't belong to " <<subnetPlusMask <<endl; }。