41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
#include <stdlib.h>
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#include <stdio.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <string>
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#include <arpa/inet.h>
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#include <iostream>
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uint32_t convert_cidr_to_binary_netmask(unsigned int cidr) {
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uint32_t binary_netmask = 0xFFFFFFFF;
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binary_netmask = binary_netmask << ( 32 - cidr );
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// htonl from host byte order to network
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// ntohl from network byte order to host
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// We need network byte order at output
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return htonl(binary_netmask);
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}
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uint32_t convert_ip_as_string_to_uint(std::string ip) {
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struct in_addr ip_addr;
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inet_aton(ip.c_str(), &ip_addr);
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// in network byte order
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return ip_addr.s_addr;
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}
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int main() {
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uint32_t network_zero = convert_ip_as_string_to_uint("10.10.10.0");
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uint32_t network_200 = convert_ip_as_string_to_uint("10.10.10.200");
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uint32_t binary_netmask = convert_cidr_to_binary_netmask(24);
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uint32_t generated_subnet_address = network_200 & binary_netmask;
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std::cout<<"network byte order"<<std::endl;
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std::cout<<"10.10.10.200/24\tnetwork byte order:"<<network_200 <<" host byte order:"<<ntohl(network_200)<<std::endl;
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std::cout<<"10.10.10.0/24\tnetwork byte order:" <<network_zero<<" host byte order:"<<ntohl(network_zero)<<std::endl;
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std::cout<<"generated \tnetwork byte order:" <<generated_subnet_address<<" host byte order:"<<ntohl(generated_subnet_address)<<std::endl;
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}
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