#ifndef _UTIL_H_
#define _UTIL_H_

#include "rlocs.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <openssl/sha.h>

#define debug(msg, ...) { fprintf( stderr, msg, ##__VA_ARGS__ ) ; fprintf( stdout, "\n" ); }
#define info(msg, ...) { fprintf( stdout, msg, ##__VA_ARGS__ ) ; fprintf( stdout, "\n" ); }
#define warn(msg, ...) { fprintf( stderr, msg, ##__VA_ARGS__ ) ; fprintf( stderr, "\n" ); }




void* xmalloc( size_t bytes );
int create_tun( const char* name, int multi );

int link_set_up( char *link_name, int state );

/* Our programs use this common struct to take advantage of common init code */
struct session {
    struct rlocs *rlocs;
    int fd;
};

int session_setup( struct session *session, char *config_file, char *ifname, int multi );


/* We take an array of 2n rlocs to upgrade. First element of each pair is
 * IP address, second element of each pair is path to private key file
 */
int session_upgrade_rlocs( struct session *session, int argc, char** args );
void session_teardown( struct session *session );
int sha256sum( unsigned char *src, size_t src_len, unsigned char dst[SHA256_DIGEST_LENGTH] );



#endif