/mandos/release

extern "C" {

#include <sys/types.h>		// getaddrinfo, gai_strerror, socket, inet_pton

				// connect

#include <sys/socket.h>		// getaddrinfo, gai_strerror, socket, inet_pton

				// connect

#include <unistd.h>		// close, STDIN_FILENO, STDOUT_FILENO

#include <netdb.h>		// getaddrinfo, gai_strerror

#include <arpa/inet.h>		// inet_pton

#include <sys/select.h> 	// select

#include <gnutls/gnutls.h>

#include <sys/ioctl.h> 		// ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS

#include <net/if.h> 		// ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS

#include <termios.h> 		// struct termios, tcsetattr, tcgetattr, TCSAFLUSH, ECHO

}

#include <cerrno>		// perror

#include <cstring> 		// memset

#include <string> 		// std::string, std::getline

#include <iostream> 		// cin, cout, cerr

#include <ostream> 		// <<

#define SOCKET_ERR(err,s) if(err<0) {perror(s); status = 1; goto quit;}

#define PORT 49001

#define CERTFILE "/conf/conf.d/cryptkeyreq/client-cert.pem"

#define KEYFILE "/conf/conf.d/cryptkeyreq/client-key.pem"

#define CAFILE "/conf/conf.d/cryptkeyreq/ca.pem"

gnutls_certificate_credentials_t x509_cred;

gnutls_session_t

initgnutls(){

  gnutls_session_t session;

#ifdef DEBUG

  std::cerr << "Initiate certificates\n";

#endif

  gnutls_global_init ();

  /* X509 stuff */

  gnutls_certificate_allocate_credentials (&x509_cred);

  gnutls_certificate_set_x509_trust_file (x509_cred, CAFILE, GNUTLS_X509_FMT_PEM);

  gnutls_certificate_set_x509_key_file (x509_cred, CERTFILE, KEYFILE,

					GNUTLS_X509_FMT_PEM);

  //Gnutls stuff

  gnutls_init (&session, GNUTLS_CLIENT);

  gnutls_set_default_priority (session);

  gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, x509_cred);

  return session;

}

int main (){

  int udp_sd, tcp_sd, ret;

  char buffer[4096];

  struct sockaddr_in6 to;

  struct sockaddr_in6 from;

  gnutls_session_t session;

  fd_set rfds_orig;

  struct timeval timeout;

  struct termios t_old, t_new;

  int status = 0;

  session = initgnutls ();

#ifdef DEBUG

  std::cerr << "Open ipv6 UDP\n";

#endif

  udp_sd = socket(PF_INET6, SOCK_DGRAM, 0);

  SOCKET_ERR(udp_sd,"socket");

#ifdef DEBUG

  std::cerr << "Open socket with socket nr: " << udp_sd << '\n';

#endif

  {

    int flag = 1;

    ret = setsockopt(udp_sd, SOL_SOCKET, SO_BROADCAST, & flag, sizeof(flag));

    SOCKET_ERR(ret,"setsockopt broadcast");

  }

  ret = setsockopt(udp_sd, SOL_SOCKET, SO_BINDTODEVICE, "eth0", 5);

  SOCKET_ERR(ret,"setsockopt bindtodevice");

  memset (&to, '\0', sizeof (to));

  to.sin6_family = AF_INET6;

  ret = inet_pton(AF_INET6, "ff02::1" , &to.sin6_addr);

  SOCKET_ERR(ret,"inet_pton");

  to.sin6_port = htons (PORT);	// Server Port number

  struct ifreq network;

  strcpy(network.ifr_name, "eth0");

  ret = ioctl(udp_sd, SIOCGIFFLAGS, &network);

  SOCKET_ERR(ret,"ioctl SIOCGIFFLAGS");

  network.ifr_flags |= IFF_UP;

  ret = ioctl(udp_sd, SIOCSIFFLAGS, &network);

  SOCKET_ERR(ret,"ioctl SIOCSIFFLAGS");

  FD_ZERO(&rfds_orig);

  FD_SET(udp_sd, &rfds_orig);

  FD_SET(STDIN_FILENO, &rfds_orig);

  if (tcgetattr (STDIN_FILENO, &t_old) != 0){

    return 1;

  }

  t_new = t_old;

  t_new.c_lflag &= ~ECHO;

  if (tcsetattr (STDIN_FILENO, TCSAFLUSH, &t_new) != 0){

    return 1;

  }

  for(;;){

    for(;;){

#ifdef DEBUG

      std::cerr << "Sending Marco on UDP\n";

#endif

      ret = sendto(udp_sd, "Marco", 5, 0, reinterpret_cast<const sockaddr*>(&to), sizeof(to));

      if (ret < 0){

	perror("sendto");

      }

      fd_set rfds = rfds_orig;

      timeout.tv_sec = 10;

      timeout.tv_usec = 0;

      std::cerr << "Password: ";

      ret = select(udp_sd+1, &rfds, 0, 0, & timeout);

      SOCKET_ERR(udp_sd,"select");

      if (ret){

	if (FD_ISSET(STDIN_FILENO, &rfds)){

	  std::string buffer;

	  std::getline(std::cin, buffer);

	  std::cerr << '\n';

	  std::cout << buffer;

	  goto quit;

	}

	socklen_t from_len = sizeof(from);

	ret = recvfrom(udp_sd,buffer,512,0, reinterpret_cast<sockaddr *>(& from),

		       & from_len);

	SOCKET_ERR(ret,"recv");

	if (strncmp(buffer,"Polo", 4) == 0){

	  break;

	}

      }

      std::cerr << '\r';

    }

    tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);

    SOCKET_ERR(tcp_sd,"socket");

    setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, "eth0", 5);

    SOCKET_ERR(ret,"setsockopt bindtodevice");

    memset(&to,0,sizeof(to));

    to.sin6_family = from.sin6_family;

    to.sin6_port   = from.sin6_port;

    to.sin6_addr   = from.sin6_addr;

    to.sin6_scope_id   = from.sin6_scope_id;

    ret = connect(tcp_sd,reinterpret_cast<struct sockaddr *>(&to),sizeof(to));

    if (ret < 0){

      perror("connect");

      continue;

    }

    gnutls_transport_set_ptr (session, reinterpret_cast<gnutls_transport_ptr_t> (tcp_sd));

    ret = gnutls_handshake (session);

    if (ret < 0)

      {

	std::cerr << "\n*** Handshake failed ***\n";

	gnutls_perror (ret);

	continue;

      }

    //retrive password

    ret = gnutls_record_recv (session, buffer, sizeof(buffer));

    write(STDOUT_FILENO,buffer,ret);

    //shutdown procedure

    gnutls_bye (session, GNUTLS_SHUT_RDWR);

    close(tcp_sd);

    gnutls_deinit (session);

    gnutls_certificate_free_credentials (x509_cred);

    gnutls_global_deinit ();

    break;

  }

  close(udp_sd);

 quit:

  tcsetattr (STDIN_FILENO, TCSAFLUSH, &t_old);

  return status;

}