71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
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extern "C" {
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#include <stdio.h>
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#include <arpa/inet.h>
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}
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#include <format>
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#include <expected>
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#include <string>
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#include <ostream>
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#include <iostream>
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std::expected<std::string, std::string> network6(std::string network, int prefix) {
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struct in6_addr addr;
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unsigned char mask[16] = {0};
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if (inet_pton(AF_INET6, network.data(), &addr) != 1) {
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return std::unexpected(std::format("Invalid network address {}", network));
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}
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for (int i = 0; i < prefix; i++) {
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mask[i / 8] |= (1 << (7 - (i % 8)));
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}
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for (int i = 0; i < 16; i++) {
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addr.s6_addr[i] &= mask[i];
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}
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uint64_t *host_part = (uint64_t *)&addr.s6_addr[8];
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uint64_t hostnum = be64toh(*host_part);
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hostnum += 2;
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*host_part = htobe64(hostnum);
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char buffer[INET6_ADDRSTRLEN] = {'\0'};
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inet_ntop(AF_INET6, &addr, buffer, INET6_ADDRSTRLEN);
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return std::string(buffer);
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}
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std::expected<std::string, std::string> network4(std::string network, int prefix) {
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struct in_addr inaddr;
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if (inet_pton(AF_INET, network.data(), &inaddr) != 1) {
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return std::unexpected(std::format("Invalid network address {}", network));
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}
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uint32_t ip = ntohl(inaddr.s_addr);
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uint32_t mask = (prefix == 0) ? 0 : (~0U << (32 - prefix));
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uint32_t fip = (ip & mask) + 1;
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struct in_addr ip_addr;
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ip_addr.s_addr = htonl(ip);
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return std::string(inet_ntoa(ip_addr));
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}
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int main() {
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auto net4Res = network4("192.168.1.154", 26);
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if (!net4Res) {
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std::cerr << net4Res.error() << std::endl;
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return 1;
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}
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std::cout << net4Res.value() << std::endl;
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auto net6Res = network6("2001:db8:abcd:1234::0", 64);
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if (!net6Res) {
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std::cerr << net6Res.error() << std::endl;
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return 1;
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}
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std::cout << net6Res.value() << std::endl;
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return 0;
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}
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