如何判断IP地址是否合法

来源：互联网发布：淘宝在哪改收货地址编辑：程序博客网时间：2024/04/29 08:38

如何判断一个IP地址是否合法，以及如何判断一个IP地址是否在给定的IP地址范围内，废话不多说，上代码

判断IP地址是否合法：

bool isValidIP(char *ip){if (ip == NULL)return false;char temp[4];int count = 0;while (true){int index = 0;while (*ip != '\0' && *ip != '.' && count < 4){temp[index++] = *ip;ip++;}if (index == 4)return false;temp[index] = '\0';int num = atoi(temp);if (!(num >= 0 && num <= 255))return false;count++;if (*ip == '\0'){if (count == 4)return true;elsereturn false;}elseip++;}}

判断一个IP地址是否在给定的IP地址范围内：

bool IsIpInner(string strDesIp, string strBegin, string strEnd){char* tempDesIp = const_cast<char*>(strDesIp.c_str());char* tempBegin = const_cast<char*>(strBegin.c_str());char* tempEnd = const_cast<char*>(strEnd.c_str());if (isValidIP(tempDesIp) && isValidIP(tempBegin) && isValidIP(tempEnd)){unsigned long lDesIp = GetIpInt(strDesIp);unsigned long lBegin = GetIpInt(strBegin);;unsigned long lEnd = GetIpInt(strEnd);;return (((lDesIp >= lBegin) && (lDesIp <= lEnd)) || ((lDesIp <= lBegin) && (lDesIp >= lEnd)));}elsereturn false;}

其中GetIpInt(string strIp)是将IP地址转化为可比较大小的整形数，如下：

unsigned long GetIpInt(string strIp){char* tempIp = const_cast<char*>(strIp.c_str());char *next_token = NULL;char* ch1 = strtok_s(tempIp, ".", &next_token);char* ch2 = strtok_s(NULL, ".", &next_token);char* ch3 = strtok_s(NULL, ".", &next_token);char* ch4 = strtok_s(NULL, ".", &next_token);unsigned long a = stoi(ch1);unsigned long b = stoi(ch2);unsigned long c = stoi(ch3);unsigned long d = stoi(ch4);return a * 255 * 255 * 255 + b * 255 * 255 + c * 255 + d;}

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