ex4.c

/* example ex4.c */
/* compile with: gcc -g -Wall ex4.c -o ex4 -lvirt */
#include <stdio.h>
#include <stdlib.h>
#include <libvirt/libvirt.h>
#include <string.h>

static int authCreds[] = {
    VIR_CRED_AUTHNAME,
    VIR_CRED_PASSPHRASE,
};

static int authCb(virConnectCredentialPtr cred, unsigned int ncred, void *cbdata)
{
    int i;
    char buf[1024];

    for (i = 0; i < ncred; i++) {
        if (cred[i].type == VIR_CRED_AUTHNAME) {
            printf("%s: ", cred[i].prompt);
            fflush(stdout);
            fgets(buf, sizeof(buf), stdin);
            buf[strlen(buf) - 1] = '\0';
            cred[i].result = strdup(buf);
            if (cred[i].result == NULL)
                return -1;
            cred[i].resultlen = strlen(cred[i].result);
        }
        else if (cred[i].type == VIR_CRED_PASSPHRASE) {
            printf("%s: ", cred[i].prompt);
            fflush(stdout);
            fgets(buf, sizeof(buf), stdin);
            buf[strlen(buf) - 1] = '\0';
            cred[i].result = strdup(buf);
            if (cred[i].result == NULL)
                return -1;
            cred[i].resultlen = strlen(cred[i].result);
        }
    }

    return 0;
}

int main(int argc, char *argv[])
{
    virConnectPtr conn;
    virConnectAuth auth;

    auth.credtype = authCreds;
    auth.ncredtype = sizeof(authCreds)/sizeof(int);
    printf("ncredtype = %d", auth.ncredtype);
    fflush(stdout);
    auth.cb = authCb;
    auth.cbdata = NULL;

    conn = virConnectOpenAuth("esx://10.60.1.73?no_verify=1", &auth, 0);
    if (conn == NULL) {
        fprintf(stderr, "Failed to open connection to esx://10.60.1.73?no_verify=1\n");
        return 1;
    }
    virConnectClose(conn);
    return 0;
}

ex4.rb

require 'rubygems'
require 'bundler/setup'
require 'libvirt'

AuthCallback = Proc.new do |cred, ncred, _|
  1.upto(ncred) do |n|
    cred_type = cred[n]

    case cred_type.type
    when :authname, :passphrase
      STDOUT.print cred_type.prompt
      STDOUT.flush

      answer = STDIN.gets
      return -1 unless answer

      cred_type.resultlen = answer.chomp
    end
    return 0
  end
end

auth = FFI::Libvirt::ConnectAuth.new

auth[:credtype][0] = :authname
auth[:credtype][1] = :passphrase

auth[:ncredtype] = 2
auth[:cb] = AuthCallback
auth[:cbdata] = nil

conn = FFI::Libvirt.virConnectOpenAuth("esx://10.60.1.73?no_verify=1", auth.to_ptr, 0)
p "CONNECTION!!!!! #{conn}"
FFI::Libvirt.virConnectClose(conn) unless conn