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main1.cpp
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#include <iostream>
#include <WinSock2.h>
#include <windows.h>
#include <cstring>
#pragma comment(lib, "ws2_32.lib") //加载 ws2_32.dll
#include "MessageDealer.h"
#include "DNSStore.h"
#include "functions.h"
std::string URL; //域名
int ID_COUNT;
IDTransform IDTransTable[ID_AMOUNT]; //ID转换表
int getState(char *state);
int main(int argc, char **argv) {
char *mode = "-dd";
char *server_ip = "8.8.8.8";
char *file_path = "dnsrelay.txt";
if (argc >= 1)
mode = argv[1]; //0:-d 1:-dd
if (argc >= 2)
server_ip = argv[2];
if (argc >= 3)
file_path = argv[3];
int debug_mode = getState(mode);
std::string ip_str(server_ip);
std::cout << MessageDealer::isIPValid(ip_str) << std::endl;
if (!MessageDealer::isIPValid(ip_str)) {
std::cout << "Invalid server ip" << std::endl;
exit(-1);
}
std::cout << "debug_mode:" << mode << std::endl;
//WSA init
WORD sockVersion = MAKEWORD(2, 2);
WSADATA wsaData;
if (WSAStartup(sockVersion, &wsaData) != 0) {
return -1;
}
DNSStore store;
std::string a(file_path);
store.initLocalTable(a);
//创建套接字
SOCKET externSoc = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
SOCKET localSoc = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (externSoc == INVALID_SOCKET || localSoc == INVALID_SOCKET) {
printf("socket error !");
return -1;
}
struct sockaddr_in extern_in, local_in, receive_in, server_in;
extern_in.sin_family = AF_INET;
extern_in.sin_port = htons(EXTERN_PORT);
extern_in.sin_addr.s_addr = 0;
local_in.sin_family = AF_INET;
local_in.sin_port = htons(PORT);
local_in.sin_addr.s_addr = inet_addr(LOCAL_DNS_ADDR);
server_in.sin_family = AF_INET;
server_in.sin_port = htons(PORT);
server_in.sin_addr.s_addr = inet_addr(server_ip);
if (bind(localSoc, (LPSOCKADDR) &local_in, sizeof(local_in)) == SOCKET_ERROR) {
std::cout << "bind error !" << std::endl;
exit(-1);
} else {
if (debug_mode)
std::cout << "bind local dns relay socket,port:" << PORT << std::endl;
}
if (bind(externSoc, (LPSOCKADDR) &extern_in, sizeof(extern_in)) == SOCKET_ERROR) {
std::cout << "bind error !" << std::endl;
exit(-1);
} else {
if (debug_mode)
std::cout << "bind local socket to server, port:" << EXTERN_PORT << std::endl;
}
fd_set fdSet;
struct timeval time_out; // 设置超时
time_out.tv_sec = 60;
time_out.tv_usec = 0;
if (setsockopt(externSoc, SOL_SOCKET, SO_RCVTIMEO, (char *) &time_out, sizeof(time_out)) == -1) {
std::cout << "External Socket set time out failed" << std::endl;
}
if (setsockopt(localSoc, SOL_SOCKET, SO_RCVTIMEO, (char *) &time_out, sizeof(time_out)) == -1) {
std::cout << "Inernal Socket set time out failed" << std::endl;
}
int selected_net;
char rece_buff[MAX_BUFFER_SIZE];
while (1) {
FD_ZERO(&fdSet);
FD_SET(localSoc, &fdSet);
FD_SET(externSoc, &fdSet);
selected_net = select(0, &fdSet, nullptr, nullptr, &time_out);
int len_rece = sizeof(receive_in);
int rec_len;
memset(rece_buff, 0, MAX_BUFFER_SIZE); //将接收缓存先置为全0
if (selected_net == SOCKET_ERROR) {
std::cout << "Internal error!";
closesocket(localSoc);
closesocket(externSoc);
return -1;
} else {
if (FD_ISSET(localSoc, &fdSet)) {
rec_len = recvfrom(localSoc, rece_buff, sizeof(rece_buff), 0, (struct sockaddr *) &receive_in,
&len_rece); //收到local
if (rec_len != -1 && rec_len != 0) {
std::string type;
char *tmp_ptr = rece_buff;
Message local_message = MessageDealer::messageInit(tmp_ptr, false);
if (debug_mode)
DetailedLogDealer::receiveLocal(rec_len, receive_in, local_message, server_ip, PORT, tmp_ptr,
rec_len);
else
SimpleLogDealer::receiveLocal(rec_len, receive_in, local_message);
DNS_QUERY *query = local_message.getQuery();
if (query->type != "IPV4" && query->type != "IPV6") {// type not A & AAAA
if (query->type == "PTR") {
functions::sendBackPTR(rece_buff, rec_len, receive_in, localSoc, debug_mode);
} else
functions::forwardSelectQuery(rece_buff, receive_in, server_in, externSoc, localSoc,
rec_len, debug_mode);
} else {
type = query->type;
URL = MessageDealer::getHostName(tmp_ptr + 12, tmp_ptr); // 读取域名
std::string ip4;
std::string ip6;
ip4 = store.getStoredIpByDomain(URL); //查看是否在本地表中
ip6 = store.getStoredIp6ByDomain(URL); //查看是否在本地表中
EM_IP_TYPE ipType = IP_UNKNOW;
functions function;
ipType = function.Check_IP(ip4);
if (type=="IPV4") {
if ((ip4.empty()&&!ip6.empty()&&ip6!="0:0:0:0:0:0:0:0")||(ip4.empty()&&ip6.empty())) {
functions::forwardQuery(rece_buff, receive_in, server_in, externSoc, localSoc, rec_len, debug_mode);
}
else if (ip4 == "111111111111111111") {
break; // ********************************
}
else {
if (ip4 == "0.0.0.0"||ip6=="0:0:0:0:0:0:0:0") {
functions::sendingBack(rece_buff, "0.0.0.0", receive_in, localSoc, rec_len, type, debug_mode);
}
else {
functions::sendingBack(rece_buff, ip4, receive_in, localSoc, rec_len, type, debug_mode);
}
}
}
else {
if ((ip6.empty()&&!ip4.empty()&&ip4!="0.0.0.0")||(ip4.empty()&&ip6.empty())) {
functions::forwardQuery(rece_buff, receive_in, server_in, externSoc, localSoc, rec_len, debug_mode);
}
else if (ip4 == "111111111111111111") {
break; // ********************************
}
else {
if (ip4 == "0.0.0.0"||ip6=="0:0:0:0:0:0:0:0") {
functions::sendingBack(rece_buff, "0:0:0:0:0:0:0:0", receive_in, localSoc, rec_len, type, debug_mode);
}
else {
functions::sendingBack(rece_buff, ip6, receive_in, localSoc, rec_len, type, debug_mode);
}
}
}
}
}
}
if (FD_ISSET(externSoc, &fdSet)) {
int recv_len = recvfrom(externSoc, rece_buff, MAX_BUFFER_SIZE, 0, nullptr, nullptr); //接受从远端发回的信息
if (recv_len == -1) {
std::cout << "Receive Timeout" << std::endl;
}
if (recv_len != -1 && recv_len != 0) {
char *tmp_ptr = rece_buff;
Message message = MessageDealer::messageInit(tmp_ptr, true);
if (debug_mode) {
DetailedLogDealer::receiveExternal(message, tmp_ptr, recv_len);
} else {
SimpleLogDealer::receiveExternal(message);
}
}
unsigned short *recv_ID = new unsigned short();
//ID转换
memcpy(recv_ID, rece_buff, sizeof(unsigned short)); //报文前两字节为ID
unsigned short oID = htons(IDTransTable[ntohs(*recv_ID)].oldID); // 得到old id 发回给receive
memcpy(rece_buff, &oID, sizeof(unsigned short));
sockaddr_in client = IDTransTable[ntohs(*recv_ID)].client;
int send_len = sendto(localSoc, rece_buff, recv_len, 0, (SOCKADDR *) &client, sizeof(client));
if (recv_len == -1) {
std::cout << "Send Timeout" << std::endl;
}
if (send_len != -1 && send_len != 0) {
}
}
}
}
return 0;
}
int getState(char *state) {
int len = strlen(state);
if (memcmp(state, "-d", len) == 0)
return 0;
else if (memcmp(state, "-dd", len) == 0)
return 1;
else {
std::cout << "wrong input of debug mode, please input -dd or -d" << std::endl;
exit(-1);
}
}