Martin Michelsen
112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
#include "NetworkAddresses.hh"
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#include <arpa/inet.h>
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#include <errno.h>
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#include <ifaddrs.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <memory>
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#include <phosg/Encoding.hh>
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#include <phosg/Network.hh>
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#include <phosg/Strings.hh>
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#include <stdexcept>
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using namespace std;
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uint32_t resolve_address(const char* address) {
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struct addrinfo* res0;
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if (getaddrinfo(address, nullptr, nullptr, &res0)) {
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auto e = phosg::string_for_error(errno);
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throw runtime_error(phosg::string_printf(
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"can\'t resolve hostname %s: %s", address, e.c_str()));
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}
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std::unique_ptr<struct addrinfo, void (*)(struct addrinfo*)> res0_unique(res0, freeaddrinfo);
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struct addrinfo* res4 = nullptr;
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for (struct addrinfo* res = res0; res; res = res->ai_next) {
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if (res->ai_family == AF_INET) {
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res4 = res;
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}
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}
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if (!res4) {
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throw runtime_error(phosg::string_printf(
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"can\'t resolve hostname %s: no usable data", address));
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}
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struct sockaddr_in* res_sin = (struct sockaddr_in*)res4->ai_addr;
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return ntohl(res_sin->sin_addr.s_addr);
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}
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map<string, uint32_t> get_local_addresses() {
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struct ifaddrs* ifa_raw;
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if (getifaddrs(&ifa_raw)) {
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auto s = phosg::string_for_error(errno);
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throw runtime_error(phosg::string_printf("failed to get interface addresses: %s", s.c_str()));
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}
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unique_ptr<struct ifaddrs, void (*)(struct ifaddrs*)> ifa(ifa_raw, freeifaddrs);
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map<string, uint32_t> ret;
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for (struct ifaddrs* i = ifa.get(); i; i = i->ifa_next) {
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if (!i->ifa_addr) {
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continue;
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}
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auto* sin = reinterpret_cast<sockaddr_in*>(i->ifa_addr);
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if (sin->sin_family != AF_INET) {
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continue;
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}
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ret.emplace(i->ifa_name, ntohl(sin->sin_addr.s_addr));
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}
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return ret;
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}
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bool is_loopback_address(uint32_t addr) {
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return ((addr & 0xFF000000) == 0x7F000000); // 127.0.0.0/8
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}
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bool is_local_address(uint32_t addr) {
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return is_loopback_address(addr) || // 127.0.0.0/8
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((addr & 0xFF000000) == 0x0A000000) || // 10.0.0.0/8
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((addr & 0xFFF00000) == 0xAC100000) || // 172.16.0.0/12
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((addr & 0xFFFF0000) == 0xC0A80000) || // 192.168.0.0/16
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((addr & 0xFFFF0000) == 0xA9FE0000); // 169.254.0.0/16
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}
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bool is_local_address(const sockaddr_storage& daddr) {
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if (daddr.ss_family != AF_INET) {
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return false;
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}
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const sockaddr_in* sin = reinterpret_cast<const sockaddr_in*>(&daddr);
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return is_local_address(ntohl(sin->sin_addr.s_addr));
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}
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string string_for_address(uint32_t address) {
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return phosg::string_printf("%hhu.%hhu.%hhu.%hhu",
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static_cast<uint8_t>(address >> 24), static_cast<uint8_t>(address >> 16),
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static_cast<uint8_t>(address >> 8), static_cast<uint8_t>(address));
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}
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uint32_t address_for_string(const char* address) {
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return ntohl(inet_addr(address));
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}
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uint64_t devolution_phone_number_for_netloc(uint32_t addr, uint16_t port) {
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// It seems the address part of the number is fixed-width, but the port is
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// not. Why did they do it this way?
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if (port & 0xF000) {
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return (static_cast<uint64_t>(addr) << 16) | port;
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} else if (port & 0x0F00) {
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return (static_cast<uint64_t>(addr) << 12) | port;
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} else if (port & 0x00F0) {
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return (static_cast<uint64_t>(addr) << 8) | port;
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} else {
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return (static_cast<uint64_t>(addr) << 4) | port;
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}
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}
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