101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
/* Header file for encrypted-stream library.
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Written by Ken Raeburn (Raeburn@Cygnus.COM).
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Copyright (C) 1991, 1992 by Cygnus Support.
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This file is distributed under the same terms as Kerberos.
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For copying and distribution information, please see the file
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<mit-copyright.h>.
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$NetBSD: kstream.h,v 1.1.1.1 2000/06/17 06:24:28 thorpej Exp $
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*/
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#include <sys/types.h> /* for size_t */
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/* Each stream is set up for two-way communication; if buffering is
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requested, output will be flushed before input is read, or when
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kstream_flush is called. */
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#if defined (__STDC__) || defined (__cplusplus)
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typedef void *kstream_ptr;
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#else
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typedef char *kstream_ptr;
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#endif
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typedef struct kstream_rec *kstream;
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struct kstream_data_block {
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kstream_ptr ptr;
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size_t length;
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};
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struct kstream_crypt_ctl_block {
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/* Don't rely on anything in this structure.
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It is almost guaranteed to change.
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Right now, it's just a hack so we can bang out the interface
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in some form that lets us run both rcp and rlogin. This is also
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the only reason the contents of this structure are public. */
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#if defined (__STDC__) || defined (__cplusplus)
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int (*encrypt) (struct kstream_data_block *, /* output -- written */
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struct kstream_data_block*, /* input */
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kstream str
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); /* ret val = # input bytes used */
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int (*decrypt) (struct kstream_data_block *, /* output -- written */
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struct kstream_data_block*, /* input */
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kstream str
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); /* ret val = # input bytes used */
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int (*init) (kstream str, kstream_ptr data);
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void (*destroy) (kstream str);
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#else
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int (*encrypt) (), (*decrypt) (), (*init) ();
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void (*destroy) ();
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#endif
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};
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/* ctl==0 means no encryption. data is specific to crypt functions */
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#if defined (__STDC__) || defined (__cplusplus)
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kstream kstream_create_from_fd (int fd,
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const struct kstream_crypt_ctl_block *ctl,
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kstream_ptr data);
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/* There should be a "standard" DES mode used here somewhere.
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These differ, and I haven't chosen one over the other (yet). */
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kstream kstream_create_rlogin_from_fd (int fd, void* sched,
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unsigned char (*ivec)[8]);
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kstream kstream_create_rcp_from_fd (int fd, void* sched,
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unsigned char (*ivec)[8]);
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int kstream_write (kstream, void*, size_t);
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int kstream_read (kstream, void*, size_t);
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int kstream_flush (kstream);
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int kstream_destroy (kstream);
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void kstream_set_buffer_mode (kstream, int);
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#else
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kstream kstream_create_from_fd (),
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kstream_create_rlogin_from_fd (),
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kstream_create_rcp_from_fd ();
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void kstream_set_buffer_mode ();
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#endif
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#if 0 /* Perhaps someday... */
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kstream kstream_create (principal, host, port, ...);
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#endif
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#if !defined (__STDC__) && !defined (__cplusplus) && !defined (const)
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#define const /* empty */
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#endif
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typedef struct fifo {
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char data[10*1024];
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size_t next_write, next_read;
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} fifo;
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typedef struct kstream_rec {
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const struct kstream_crypt_ctl_block *ctl;
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int fd;
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int buffering : 2;
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kstream_ptr data;
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/* These should be made pointers as soon as code has been
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written to reallocate them. Also, it would be more efficient
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to use pointers into the buffers, rather than continually shifting
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them down so unprocessed data starts at index 0. */
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/* incoming */
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fifo in_crypt, in_clear;
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/* outgoing */
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fifo out_clear;
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} kstream_rec;
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