#include "rsh_locl.h"
RCSID("$Id$");

ssize_t
do_read (int fd,
	 void *buf,
	 size_t sz)
{
    int ret;

    if (do_encrypt) {
#ifdef KRB4
	if (auth_method == AUTH_KRB4) {
	    return des_enc_read (fd, buf, sz, schedule, &iv);
	} else
#endif /* KRB4 */
        if(auth_method == AUTH_KRB5) {
	    u_int32_t len, outer_len;
	    int status;
	    krb5_data data;

	    ret = krb5_net_read (context, fd, &len, 4);
	    if (ret != 4)
		return ret;
	    len = ntohl(len);
	    outer_len = len + 12;
	    outer_len = (outer_len + 7) & ~7;
	    if (outer_len > sz)
		abort ();
	    ret = krb5_net_read (context, fd, buf, outer_len);
	    if (ret != outer_len)
		return ret;
	    status = krb5_decrypt(context, buf, outer_len,
				  ETYPE_DES_CBC_CRC, /* XXX */
				  keyblock, &data);
	    if (status)
		errx (1, "%s", krb5_get_err_text (context, status));
	    memcpy (buf, data.data, len);
	    free (data.data);
	    return len;
	} else {
	    abort ();
	}
    } else
	return read (fd, buf, sz);
}

ssize_t
do_write (int fd, void *buf, size_t sz)
{
    int ret;

    if (do_encrypt) {
#ifdef KRB4
	if(auth_method == AUTH_KRB4) {
	    return des_enc_write (fd, buf, sz, schedule, &iv);
	} else
#endif /* KRB4 */
	if(auth_method == AUTH_KRB5) {
	    krb5_error_code status;
	    krb5_data data;
	    u_int32_t len;
	    int ret;

	    status = krb5_encrypt (context,
				   buf,
				   sz,
				   ETYPE_DES_CBC_CRC, /* XXX */
				   keyblock,
				   &data);
	    if (status)
		errx (1, "%s", krb5_get_err_text(context, status));
	    len = htonl(sz);
	    ret = krb5_net_write (context, fd, &len, 4);
	    if (ret != 4)
		return ret;
	    ret = krb5_net_write (context, fd, data.data, data.length);
	    if (ret != data.length)
		return ret;
	    free (data.data);
	    return sz;
	} else {
	    abort();
	}
    } else
	return write (fd, buf, sz);
}

ssize_t
net_write (int fd,
	   const void *buf,
	   size_t len)
{
  char *cbuf = (char *)buf;
  ssize_t count;
  size_t rem = len;

  while (rem > 0) {
    count = write (fd, cbuf, rem);
    if (count < 0)
      return count;
    cbuf += count;
    rem -= count;
  }
  return len;
}

ssize_t
net_read (int fd,
	  void *buf,
	  size_t len)
{
  char *cbuf = (char *)buf;
  ssize_t count;
  size_t rem = len;

  while (rem > 0) {
    count = read (fd, cbuf, rem);
    if (count <= 0)
      return count;
    cbuf += count;
    rem -= count;
  }
  return len;
}