/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

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

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

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

#include <gnutls/gnutls.h>

}

#include <cstdio>		// fprintf

#include <cerrno>		// perror

#include <cstring> 		// memset

#define SOCKET_ERR(err,s) if(err<0) {perror(s);return(1);}

#define PORT 49001

#define CERTFILE "client-cert.pem"

#define KEYFILE "client-key.pem"

#define CAFILE "ca.pem"

gnutls_certificate_credentials_t x509_cred;

gnutls_session_t

initgnutls(){

  gnutls_session_t session;

  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 sd, ret;

  char buffer[512];

  struct sockaddr_in6 to;

  struct sockaddr_in6 from;

  gnutls_session_t session;

  fd_set rfds_orig;

  struct timeval timeout;

  session = initgnutls ();

  sd = socket(PF_INET6, SOCK_DGRAM, 0);

  SOCKET_ERR(sd,"socket");

  {

    int flag = 1;

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

    SOCKET_ERR(ret,"setsockopt broadcast");

  }

  setsockopt(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,"setsockopt bindtodevice");

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

  FD_ZERO(&rfds_orig);

  FD_SET(sd, &rfds_orig);

  timeout.tv_sec = 10;

  timeout.tv_usec = 0;

  for(;;){

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

    fd_set rfds = rfds_orig;

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

    SOCKET_ERR(sd,"select");

    if (ret){

      socklen_t from_len = sizeof(from);

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

		     & from_len);

      SOCKET_ERR(ret,"recv");

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

	break;

      }

    }

  }

  write(1,buffer,ret);

  write(1,"\n",1);

  //shutdown procedure

  close(sd);

  sleep(1);

  sd = socket(PF_INET6, SOCK_STREAM, 0);

  SOCKET_ERR(sd,"socket");

  setsockopt(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(sd,reinterpret_cast<struct sockaddr *>(&to),sizeof(to));

  SOCKET_ERR(ret,"connect");

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

  ret = gnutls_handshake (session);

  if (ret < 0)

    {

      fprintf (stderr, "*** Handshake failed\n");

      gnutls_perror (ret);

      return 1;

    }

  printf ("- Handshake was completed\n");

  //message to be seent

  gnutls_record_send (session, "The secret message is \"squeamish ossifrage\"\n", 44);

  //shutdown procedure

  gnutls_bye (session, GNUTLS_SHUT_RDWR);

  close(sd);

  gnutls_deinit (session);

  gnutls_certificate_free_credentials (x509_cred);

  gnutls_global_deinit ();

  close(sd);

  return 0;

}