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#include "stdafx.h"
#include "udp_address.h"
#include <util/system/mutex.h>
#include <util/system/spinlock.h>
#ifdef _win_
#include <iphlpapi.h>
#pragma comment(lib, "Iphlpapi.lib")
#else
#include <errno.h>
#include <ifaddrs.h>
#endif
namespace NNetliba {
static bool IsValidIPv6(const char* sz) {
enum {
S1,
SEMICOLON,
SCOPE
};
int state = S1, scCount = 0, digitCount = 0, hasDoubleSemicolon = false;
while (*sz) {
if (state == S1) {
switch (*sz) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
++digitCount;
if (digitCount > 4)
return false;
break;
case ':':
state = SEMICOLON;
++scCount;
break;
case '%':
state = SCOPE;
break;
default:
return false;
}
++sz;
} else if (state == SEMICOLON) {
if (*sz == ':') {
if (hasDoubleSemicolon)
return false;
hasDoubleSemicolon = true;
++scCount;
digitCount = 0;
state = S1;
++sz;
} else {
digitCount = 0;
state = S1;
}
} else if (state == SCOPE) {
// arbitrary string is allowed as scope id
++sz;
}
}
if (!hasDoubleSemicolon && scCount != 7)
return false;
return scCount <= 7;
}
static bool ParseInetName(TUdpAddress* pRes, const char* name, int nDefaultPort, EUdpAddressType addressType) {
int nPort = nDefaultPort;
TString host;
if (name[0] == '[') {
++name;
const char* nameFin = name;
for (; *nameFin; ++nameFin) {
if (nameFin[0] == ']')
break;
}
host.assign(name, nameFin);
Y_ASSERT(IsValidIPv6(host.c_str()));
name = *nameFin ? nameFin + 1 : nameFin;
if (name[0] == ':') {
char* endPtr = nullptr;
nPort = strtol(name + 1, &endPtr, 10);
if (!endPtr || *endPtr != '\0')
return false;
}
} else {
host = name;
if (!IsValidIPv6(name)) {
size_t nIdx = host.find(':');
if (nIdx != (size_t)TString::npos) {
const char* pszPort = host.c_str() + nIdx + 1;
char* endPtr = nullptr;
nPort = strtol(pszPort, &endPtr, 10);
if (!endPtr || *endPtr != '\0')
return false;
host.resize(nIdx);
}
}
}
addrinfo aiHints;
Zero(aiHints);
aiHints.ai_family = AF_UNSPEC;
aiHints.ai_socktype = SOCK_DGRAM;
aiHints.ai_protocol = IPPROTO_UDP;
// Do not use TMutex here: it has a non-trivial destructor which will be called before
// destruction of current thread, if its TThread declared as global/static variable.
static TAdaptiveLock cs;
TGuard lock(cs);
addrinfo* aiList = nullptr;
for (int attempt = 0; attempt < 1000; ++attempt) {
int rv = getaddrinfo(host.c_str(), "1313", &aiHints, &aiList);
if (rv == 0)
break;
if (aiList) {
freeaddrinfo(aiList);
}
if (rv != EAI_AGAIN) {
return false;
}
usleep(100 * 1000);
}
for (addrinfo* ptr = aiList; ptr; ptr = ptr->ai_next) {
sockaddr* addr = ptr->ai_addr;
if (addr == nullptr)
continue;
switch (addressType) {
case UAT_ANY: {
if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
continue;
break;
}
case UAT_IPV4: {
if (addr->sa_family != AF_INET)
continue;
break;
}
case UAT_IPV6: {
if (addr->sa_family != AF_INET6)
continue;
break;
}
}
GetUdpAddress(pRes, *(sockaddr_in6*)addr);
pRes->Port = nPort;
freeaddrinfo(aiList);
return true;
}
freeaddrinfo(aiList);
return false;
}
bool GetLocalAddresses(TVector<TUdpAddress>* addrs) {
#ifdef _win_
TVector<char> buf;
buf.resize(1000000);
PIP_ADAPTER_ADDRESSES adapterBuf = (PIP_ADAPTER_ADDRESSES)&buf[0];
ULONG bufSize = buf.ysize();
ULONG rv = GetAdaptersAddresses(AF_UNSPEC, 0, NULL, adapterBuf, &bufSize);
if (rv != ERROR_SUCCESS)
return false;
for (PIP_ADAPTER_ADDRESSES ptr = adapterBuf; ptr; ptr = ptr->Next) {
if ((ptr->Flags & (IP_ADAPTER_IPV4_ENABLED | IP_ADAPTER_IPV6_ENABLED)) == 0) {
continue;
}
if (ptr->IfType == IF_TYPE_TUNNEL) {
// ignore tunnels
continue;
}
if (ptr->OperStatus != IfOperStatusUp) {
// ignore disable adapters
continue;
}
if (ptr->Mtu < 1280) {
fprintf(stderr, "WARNING: MTU %lu is less then ipv6 minimum", ptr->Mtu);
}
for (IP_ADAPTER_UNICAST_ADDRESS* addr = ptr->FirstUnicastAddress; addr; addr = addr->Next) {
sockaddr* x = (sockaddr*)addr->Address.lpSockaddr;
if (x == 0)
continue;
if (x->sa_family == AF_INET || x->sa_family == AF_INET6) {
TUdpAddress address;
sockaddr_in6* xx = (sockaddr_in6*)x;
GetUdpAddress(&address, *xx);
addrs->push_back(address);
}
}
}
return true;
#else
ifaddrs* ifap;
if (getifaddrs(&ifap) != -1) {
for (ifaddrs* ifa = ifap; ifa; ifa = ifa->ifa_next) {
sockaddr* sa = (sockaddr*)ifa->ifa_addr;
if (sa == nullptr)
continue;
if (sa->sa_family == AF_INET || sa->sa_family == AF_INET6) {
TUdpAddress address;
sockaddr_in6* xx = (sockaddr_in6*)sa;
GetUdpAddress(&address, *xx);
addrs->push_back(address);
}
}
freeifaddrs(ifap);
return true;
}
return false;
#endif
}
void GetUdpAddress(TUdpAddress* res, const sockaddr_in6& addr) {
if (addr.sin6_family == AF_INET) {
const sockaddr_in& addr4 = *(const sockaddr_in*)&addr;
res->Network = 0;
res->Interface = 0xffff0000ll + (((ui64)(ui32)addr4.sin_addr.s_addr) << 32);
res->Scope = 0;
res->Port = ntohs(addr4.sin_port);
} else if (addr.sin6_family == AF_INET6) {
res->Network = *BreakAliasing<ui64>(addr.sin6_addr.s6_addr + 0);
res->Interface = *BreakAliasing<ui64>(addr.sin6_addr.s6_addr + 8);
res->Scope = addr.sin6_scope_id;
res->Port = ntohs(addr.sin6_port);
}
}
void GetWinsockAddr(sockaddr_in6* res, const TUdpAddress& addr) {
if (0) { //addr.IsIPv4()) {
// use ipv4 to ipv6 mapping
//// ipv4
//sockaddr_in &toAddress = *(sockaddr_in*)res;
//Zero(toAddress);
//toAddress.sin_family = AF_INET;
//toAddress.sin_addr.s_addr = addr.GetIPv4();
//toAddress.sin_port = htons((u_short)addr.Port);
} else {
// ipv6
sockaddr_in6& toAddress = *(sockaddr_in6*)res;
Zero(toAddress);
toAddress.sin6_family = AF_INET6;
*BreakAliasing<ui64>(toAddress.sin6_addr.s6_addr + 0) = addr.Network;
*BreakAliasing<ui64>(toAddress.sin6_addr.s6_addr + 8) = addr.Interface;
toAddress.sin6_scope_id = addr.Scope;
toAddress.sin6_port = htons((u_short)addr.Port);
}
}
TUdpAddress CreateAddress(const TString& server, int defaultPort, EUdpAddressType addressType) {
TUdpAddress res;
ParseInetName(&res, server.c_str(), defaultPort, addressType);
return res;
}
TString GetAddressAsString(const TUdpAddress& addr) {
char buf[1000];
if (addr.IsIPv4()) {
int ip = addr.GetIPv4();
snprintf(buf, sizeof(buf), "%d.%d.%d.%d:%d",
(ip >> 0) & 0xff, (ip >> 8) & 0xff,
(ip >> 16) & 0xff, (ip >> 24) & 0xff,
addr.Port);
} else {
ui16 ipv6[8];
*BreakAliasing<ui64>(ipv6) = addr.Network;
*BreakAliasing<ui64>(ipv6 + 4) = addr.Interface;
char suffix[100] = "";
if (addr.Scope != 0) {
snprintf(suffix, sizeof(suffix), "%%%d", addr.Scope);
}
snprintf(buf, sizeof(buf), "[%x:%x:%x:%x:%x:%x:%x:%x%s]:%d",
ntohs(ipv6[0]), ntohs(ipv6[1]), ntohs(ipv6[2]), ntohs(ipv6[3]),
ntohs(ipv6[4]), ntohs(ipv6[5]), ntohs(ipv6[6]), ntohs(ipv6[7]),
suffix, addr.Port);
}
return buf;
}
}
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