src/gnutls.h

   1 /* GnuTLS glue for GNU Emacs.
   2    Copyright (C) 2010-2017 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software: you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation, either version 3 of the License, or (at
   9 your option) any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef EMACS_GNUTLS_DEFINED
  20 #define EMACS_GNUTLS_DEFINED
  21
  22 #ifdef HAVE_GNUTLS
  23 #include <gnutls/gnutls.h>
  24 #include <gnutls/x509.h>
  25
  26 #if 0x030000 <= GNUTLS_VERSION_NUMBER
  27 # define HAVE_GNUTLS3
  28 # include <gnutls/crypto.h>
  29 #endif
  30
  31 #include "lisp.h"
  32
  33 /* This limits the attempts to handshake per process (connection).  It
  34    should work out to about one minute in asynchronous cases. */
  35 #define GNUTLS_EMACS_HANDSHAKES_LIMIT 6000
  36
  37 typedef enum
  38 {
  39   /* Initialization stages.  */
  40   GNUTLS_STAGE_EMPTY = 0,
  41   GNUTLS_STAGE_CRED_ALLOC,
  42   GNUTLS_STAGE_FILES,
  43   GNUTLS_STAGE_CALLBACKS,
  44   GNUTLS_STAGE_INIT,
  45   GNUTLS_STAGE_PRIORITY,
  46   GNUTLS_STAGE_CRED_SET,
  47
  48   /* Handshake stages.  */
  49   GNUTLS_STAGE_HANDSHAKE_CANDO = GNUTLS_STAGE_CRED_SET,
  50   GNUTLS_STAGE_TRANSPORT_POINTERS_SET,
  51   GNUTLS_STAGE_HANDSHAKE_TRIED,
  52
  53   GNUTLS_STAGE_READY
  54 } gnutls_initstage_t;
  55
  56 #define GNUTLS_EMACS_ERROR_NOT_LOADED (GNUTLS_E_APPLICATION_ERROR_MIN + 1)
  57 #define GNUTLS_EMACS_ERROR_INVALID_TYPE GNUTLS_E_APPLICATION_ERROR_MIN
  58
  59 #define GNUTLS_INITSTAGE(proc) (XPROCESS (proc)->gnutls_initstage)
  60
  61 #define GNUTLS_PROCESS_USABLE(proc) \
  62   (GNUTLS_INITSTAGE (proc) >= GNUTLS_STAGE_READY)
  63
  64 #define GNUTLS_LOG(level, max, string)                          \
  65   do {                                                          \
  66     if ((level) <= (max))                                       \
  67       gnutls_log_function (level, "(Emacs) " string);           \
  68   } while (false)
  69
  70 #define GNUTLS_LOG2(level, max, string, extra)                  \
  71   do {                                                          \
  72     if ((level) <= (max))                                       \
  73       gnutls_log_function2 (level, "(Emacs) " string, extra);   \
  74   } while (false)
  75
  76 #define GNUTLS_LOG2i(level, max, string, extra)                 \
  77   do {                                                          \
  78     if ((level) <= (max))                                       \
  79       message ("gnutls.c: [%d] %s %d", level, string, extra);   \
  80   } while (false)
  81
  82 extern ptrdiff_t
  83 emacs_gnutls_write (struct Lisp_Process *proc, const char *buf, ptrdiff_t nbyte);
  84 extern ptrdiff_t
  85 emacs_gnutls_read (struct Lisp_Process *proc, char *buf, ptrdiff_t nbyte);
  86
  87 extern ptrdiff_t emacs_gnutls_record_check_pending (gnutls_session_t state);
  88 #ifdef WINDOWSNT
  89 extern void emacs_gnutls_transport_set_errno (gnutls_session_t state, int err);
  90 extern int w32_gnutls_rnd (gnutls_rnd_level_t, void *, size_t);
  91 #endif
  92 extern Lisp_Object emacs_gnutls_deinit (Lisp_Object);
  93 extern Lisp_Object emacs_gnutls_global_init (void);
  94 extern int gnutls_try_handshake (struct Lisp_Process *p);
  95 extern Lisp_Object gnutls_verify_boot (Lisp_Object proc, Lisp_Object proplist);
  96
  97 #endif
  98
  99 extern void syms_of_gnutls (void);
 100
 101 #endif