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/**
* opcell.c
* Onion Proxy Cell
*
* Matej Pfajfar <mp292@cam.ac.uk>
*/
/*
* Changes :
* $Log$
* Revision 1.1 2002/06/26 22:45:50 arma
* Initial revision
*
* Revision 1.1 2002/03/03 12:08:18 mp292
* Added a new type of cell - used for data going between the onion proxy and
* the first or hop. Payload size identical to that of a normal cell.
*
*/
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <openssl/rand.h>
#include "opcell.h"
#include "log.h"
opcell_t *new_padding_opcell()
{
opcell_t *c = NULL;
int retval;
c = malloc(sizeof(opcell_t));
if (!c) /* malloc() error */
return NULL;
retval = RAND_pseudo_bytes((unsigned char *)c,sizeof(opcell_t));
if (retval == -1) /* RAND_pseudo_bytes() error */
{
free((void *)c);
return NULL;
} /* RAND_pseudo_bytes() error */
c->command = OPCELL_PADDING;
return c;
}
opcell_t *new_data_opcell(unsigned char length, unsigned char *buf)
{
opcell_t *c = NULL;
int retval;
if ((length <= OPCELL_PAYLOAD_SIZE) && (buf)) /* valid parameters */
{
c = malloc(sizeof(opcell_t));
if (!c) /* malloc() error */
return NULL;
c->command = OPCELL_DATA;
c->length = length;
memcpy((void *)c->payload, (void *)buf, length);
retval = RAND_pseudo_bytes((unsigned char *)(c->payload+length),OPCELL_PAYLOAD_SIZE-length);
if (retval == -1) /* RAND_pseudo_bytes() error */
{
free((void *)c);
return NULL;
} /* RAND_pseudo_bytes() error */
return c;
} /* valid parameters */
else /* invalid parameters */
return NULL;
}
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