Windows 使用 libssh C++ 包装器的路径问题

Question

我在使用 libssh c++ 包装程序 Windows 文件路径分隔符时遇到问题 libsshpp.

假设我有以下代码：

#define SSH_NO_CPP_EXCEPTIONS
#include "libssh/libsshpp.hpp"

#include <iostream>

#pragma comment(lib, "ssh")

int main() 
{
    ssh::Session session;

    int sessionMsg = -1;

    std::string host        = "myhost.com";
    std::string user        = "username";
    std::string idfile      = "%s\.ssh\id_ed25519";
    std::string hostkeys    = "ssh-ed25519";
    std::string keyExchange = "curve25519-sha256";

    session.setOption(SSH_OPTIONS_HOST,                 host.c_str());
    session.setOption(SSH_OPTIONS_USER,                 user.c_str());
    session.setOption(SSH_OPTIONS_STRICTHOSTKEYCHECK,   (long)0);
    session.setOption(SSH_OPTIONS_HOSTKEYS,             hostkeys.c_str());
    session.setOption(SSH_OPTIONS_KEY_EXCHANGE,         keyExchange.c_str());
    session.setOption(SSH_OPTIONS_ADD_IDENTITY,         idfile.c_str());

    std::cout << "Trying to connect to " << host << " with user " << user << "...\n";

    session.connect();

    if (session.isServerKnown() != SSH_SERVER_KNOWN_OK) {
        std::cout << "Server unknown.\n";

        if (session.writeKnownhost() != SSH_OK) {
            std::cout << "Unable to write to known_hosts file.\n";
        }
        else {
            session.connect();
        }
    }

    sessionMsg = session.userauthPublickeyAuto();

    std::string err = session.getError();

    if (sessionMsg != SSH_AUTH_SUCCESS) {
        if (!err.empty()) {
            std::cout << err;
        }

        std::cout << "Auth failed.";
    }
    else {
        std::cout << err.empty() ? session.getIssueBanner() : err;
    }
}

一开始我将 idfile 值设置为 id_ed25519 但随后 libssh 抱怨：Failed to read private key: C:\Users\MyUser/.ssh/id_ed25519（注意切换斜杠）。改成%s\.ssh\id_ed25519后貌似对连接程序产生了积极的影响，然而现在老是掉进(session.writeKnownhost() != SSH_OK)代码部分。

现在，我想知道这是否可能是由于私钥文件路径出现的相同 "switching slashes" 问题造成的，因为显然 libssh 想要访问 C:\Users\MyUser\.ssh\known_hosts 但很可能路径是设置为 C:\Users\MyUser/.ssh/known_hosts.

我的问题是：是否有可能在会话中以某种方式将路径分隔符更改为 windows 样式，或者我在这里监督或做错了什么？

Answer 1

我能够解决添加 SSH_OPTIONS_SSH_DIR 选项并更改私钥和 known_hosts 路径（现在相对于 ssh 目录路径）的问题：

// note here: %s will be replaced by libssh with the home directory path
std::string sshDir = "%s//.ssh"; 
std::string idFile = "id_ed25519";
std::string knownHosts = "known_hosts";

// ...
session.setOption(SSH_OPTIONS_USER, user.c_str());
session.setOption(SSH_OPTIONS_SSH_DIR, sshDir.c_str()); // <-- added
// ...

Windows 使用 libssh C++ 包装器的路径问题

Windows path problems using libssh C++ wrapper

c++

windows

path

libssh