C ++ Shell命令提示输入密码

Question

I am trying to call some shell commands via a very small C++ program.

Commands such as "git clone" or "rsync", which require a password. For example, since git uses SSH, which is interactive, I cannot supply the password to it.

My program so far is the following:

#include <iostream>
#include <string>

std::string ExecuteShellCommand(const std::string& cmd) 
{  
  FILE* pipe = popen(cmd.c_str(), "r");

  if (!pipe) 
    return std::string("ERROR");

  char buffer[128];
  std::string result = "";

  while(!feof(pipe)) 
  {
    if(fgets(buffer, 128, pipe) != NULL)
      result += buffer;
  }

  pclose(pipe);
  return result;
}

int main()
{
  ExecuteShellCommand("git clone ssh://someurl/somerepo.git");
  return 0;
}

Output:

ssh_askpass: exec(/usr/libexec/ssh-askpass): No such file or directory

ssh_askpass: exec(/usr/libexec/ssh-askpass): No such file or directory

ssh_askpass: exec(/usr/libexec/ssh-askpass): No such file or directory

Is there a way for the process to prompt for password just like it would if I would execute the command straight from the command prompt?

Thank you!

EDIT: Ideally I would either do it in Python or Shell directly, but my program needs to read different structures in C++ (python bindings would kinda be overkill) so hence why I'm trying to do it in C++.

Answer 1

You have two choices.

First, for those that have one, you can use each program's method for working around this. For example, git has GIT_ASKPASS , and ssh has key-based authentication.

Second, you can use a pty to communicate with these programs. You can do this with a program such as expect , or with your own code (see the posix_openpt command).