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Try all resolved STUN servers

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This commit is contained in:
Cameron Gutman 2019-08-08 00:02:53 -07:00
parent 620aa4b6d1
commit 0008fbbcdb
3 changed files with 29 additions and 40 deletions
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2
mist/mist.cpp
View File

@ -732,7 +732,7 @@ bool CheckWANAccess(PSOCKADDR_IN wanAddr, PSOCKADDR_IN reportedWanAddr, bool* fo
fprintf(LOG_OUT, "Detecting WAN IP address via STUN...");
fprintf(CONSOLE_OUT, "\tTesting STUN...\n");
if (!getExternalAddressPortIP4(IPPROTO_UDP, 0, wanAddr) && !getExternalAddressPortIP4(IPPROTO_TCP, 0, wanAddr)) {
if (!getExternalAddressPortIP4(0, wanAddr)) {
DisplayMessage("Unable to determine your public IP address. Please check your Internet connection or try again in a few minutes.");
return false;
}

3
mist/mist.h
View File

@ -7,6 +7,7 @@
#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <Windows.h>
#include <ws2tcpip.h>
#include <WinSock2.h>
#include "..\version.h"
@ -14,4 +15,4 @@
#define CONSOLE_OUT stdout
#define LOG_OUT stderr
bool getExternalAddressPortIP4(int proto, unsigned short localPort, PSOCKADDR_IN wanAddr);
bool getExternalAddressPortIP4(unsigned short localPort, PSOCKADDR_IN wanAddr);

64
mist/stun.cpp
View File

@ -38,7 +38,7 @@ typedef struct _STUN_MESSAGE {
#pragma pack(pop)
bool getExternalAddressPortIP4(int proto, unsigned short localPort, PSOCKADDR_IN wanAddr)
bool getExternalAddressPortIP4(unsigned short localPort, PSOCKADDR_IN wanAddr)
{
SOCKET sock;
STUN_MESSAGE reqMsg;
@ -46,32 +46,41 @@ bool getExternalAddressPortIP4(int proto, unsigned short localPort, PSOCKADDR_IN
int bytesRead;
int tries;
int timeout;
int err;
PSTUN_ATTRIBUTE_HEADER attribute;
PSTUN_MAPPED_IPV4_ADDRESS_ATTRIBUTE ipv4Attrib;
struct hostent *host;
struct addrinfo* result;
struct addrinfo hints;
union {
STUN_MESSAGE hdr;
char buf[1024];
} resp;
host = gethostbyname("stun.moonlight-stream.org");
if (host == nullptr) {
fprintf(LOG_OUT, "gethostbyname() failed: %d\n", WSAGetLastError());
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_flags = AI_ADDRCONFIG;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
err = getaddrinfo("stun.moonlight-stream.org", "3478", &hints, &result);
if (err != 0 || result == NULL) {
fprintf(LOG_OUT, "getaddrinfo() failed: %d\n", err);
return false;
}
sock = socket(AF_INET, proto == IPPROTO_TCP ? SOCK_STREAM : SOCK_DGRAM, proto);
sock = socket(hints.ai_family, hints.ai_socktype, hints.ai_protocol);
if (sock == INVALID_SOCKET) {
fprintf(LOG_OUT, "socket() failed: %d\n", WSAGetLastError());
freeaddrinfo(result);
return false;
}
struct sockaddr_in bindAddr = {};
bindAddr.sin_family = AF_INET;
bindAddr.sin_family = hints.ai_family;
bindAddr.sin_port = htons(localPort);
if (bind(sock, (struct sockaddr*)&bindAddr, sizeof(bindAddr)) == SOCKET_ERROR) {
fprintf(LOG_OUT, "bind() failed: %d\n", WSAGetLastError());
closesocket(sock);
freeaddrinfo(result);
return false;
}
@ -82,36 +91,13 @@ bool getExternalAddressPortIP4(int proto, unsigned short localPort, PSOCKADDR_IN
reqMsg.transactionId[i] = rand();
}
SOCKADDR_IN stunAddr = {};
stunAddr.sin_family = AF_INET;
stunAddr.sin_port = htons(STUN_PORT);
stunAddr.sin_addr = *(struct in_addr*)host->h_addr;
// We'll connect() even for UDP so we can use send()/recv() and share more code
if (connect(sock, (struct sockaddr*)&stunAddr, sizeof(stunAddr)) == SOCKET_ERROR) {
fprintf(LOG_OUT, "connect() failed: %d\n", WSAGetLastError());
closesocket(sock);
return false;
}
// For UDP, we'll do 3 iterations of 1 second each. For TCP,
// we'll do one iteration with a 3 second wait.
if (proto == IPPROTO_TCP) {
tries = 1;
timeout = STUN_RECV_TIMEOUT_SEC;
}
else {
tries = STUN_RECV_TIMEOUT_SEC;
timeout = 1;
}
bytesRead = 0;
for (i = 0; i < tries; i++) {
// Retransmit the request every second until the timeout elapses
if (send(sock, (char *)&reqMsg, sizeof(reqMsg), 0) == SOCKET_ERROR) {
fprintf(LOG_OUT, "send() failed: %d\n", WSAGetLastError());
closesocket(sock);
return false;
for (i = 0; i < STUN_RECV_TIMEOUT_SEC; i++) {
// Retransmit the request every second to all resolved IP addresses until the timeout elapses
for (struct addrinfo* current = result; current != NULL; current = current->ai_next) {
if (sendto(sock, (char*)&reqMsg, sizeof(reqMsg), 0, current->ai_addr, current->ai_addrlen) == SOCKET_ERROR) {
fprintf(LOG_OUT, "sendto() failed: %d\n", WSAGetLastError());
}
}
fd_set fds;
@ -119,7 +105,7 @@ bool getExternalAddressPortIP4(int proto, unsigned short localPort, PSOCKADDR_IN
FD_SET(sock, &fds);
struct timeval tv;
tv.tv_sec = timeout;
tv.tv_sec = 1;
tv.tv_usec = 0;
int selectRes = select(0, &fds, nullptr, nullptr, &tv);
@ -130,14 +116,16 @@ bool getExternalAddressPortIP4(int proto, unsigned short localPort, PSOCKADDR_IN
else if (selectRes == SOCKET_ERROR) {
fprintf(LOG_OUT, "select() failed: %d\n", WSAGetLastError());
closesocket(sock);
freeaddrinfo(result);
return false;
}
// Error handling is below
bytesRead = recv(sock, resp.buf, sizeof(resp.buf), 0);
bytesRead = recvfrom(sock, resp.buf, sizeof(resp.buf), 0, NULL, NULL);
break;
}
freeaddrinfo(result);
closesocket(sock);
if (bytesRead == 0) {