C++判断ip是否为保留ip

来源：互联网发布：淘宝联盟的优惠券在哪编辑：程序博客网时间：2024/06/02 06:17
bool isReservedIp(const char *ip){    static const char *address_blocks[] = {        "0.0.0.0/8",        "10.0.0.0/8",        "100.64.0.0/10",        "127.0.0.0/8",        "169.254.0.0/16",        "172.16.0.0/12",        "192.0.0.0/24",        "192.0.2.0/24",        "192.88.99.0/24",        "192.168.0.0/16",        "198.18.0.0/15",        "198.51.100.0/24",        "203.0.113.0/24",        "224.0.0.0/4",        "240.0.0.0/4",        "255.255.255.255/32"    };    static const int blk_nums = sizeof(address_blocks) / sizeof(*address_blocks);    static __thread char buf[40];    for (int i = 0; i < blk_nums; ++i) {        strncpy(buf, address_blocks[i], sizeof(buf));        char *pos = strchr(buf, '/');        assert(pos != NULL);        *pos = '\0';        uint32_t val = ntohl(inet_addr(buf)); // little endian        uint32_t msk = atoi(pos + 1);        uint32_t offset = 32 - msk;        uint32_t tar = ntohl(inet_addr(ip));        if ((val >> offset) == (tar >> offset))            return true;    }    return false;}bool isReservedIp(uint32_t ip) // little endian{    static const char *address_blocks[] = {        "0.0.0.0/8",        "10.0.0.0/8",        "100.64.0.0/10",        "127.0.0.0/8",        "169.254.0.0/16",        "172.16.0.0/12",        "192.0.0.0/24",        "192.0.2.0/24",        "192.88.99.0/24",        "192.168.0.0/16",        "198.18.0.0/15",        "198.51.100.0/24",        "203.0.113.0/24",        "224.0.0.0/4",        "240.0.0.0/4",        "255.255.255.255/32"    };    static const int blk_nums = sizeof(address_blocks) / sizeof(*address_blocks);    static __thread char buf[40];    for (int i = 0; i < blk_nums; ++i) {        strncpy(buf, address_blocks[i], sizeof(buf));        char *pos = strchr(buf, '/');        assert(pos != NULL);        *pos = '\0';        uint32_t val = ntohl(inet_addr(buf)); // little endian        uint32_t msk = atoi(pos + 1);        uint32_t offset = 32 - msk;        if ((val >> offset) == (ip >> offset))            return true;    }    return false;}
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