summaryrefslogtreecommitdiffstats
path: root/libtdenetwork/libgpgme-copy/gpgme/conversion.c
blob: 01e5cae7edad81a024f86a1799176ffc7630e6be (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
/* conversion.c - String conversion helper functions.
   Copyright (C) 2000 Werner Koch (dd9jn)
   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH
 
   This file is part of GPGME.

   GPGME is free software; you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of
   the License, or (at your option) any later version.
   
   GPGME is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
   
   You should have received a copy of the GNU Lesser General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.  */

#if HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>

#include "gpgme.h"
#include "util.h"


#define atoi_1(p)   (*(p) - '0' )
#define atoi_2(p)   ((atoi_1(p) * 10) + atoi_1((p)+1))
#define atoi_4(p)   ((atoi_2(p) * 100) + atoi_2((p)+2))



/* Convert two hexadecimal digits from STR to the value they
   represent.  Returns -1 if one of the characters is not a
   hexadecimal digit.  */
int
_gpgme_hextobyte (const char *str)
{
  int val = 0;
  int i;

#define NROFHEXDIGITS 2
  for (i = 0; i < NROFHEXDIGITS; i++)
    {
      if (*str >= '0' && *str <= '9')
	val += *str - '0';
      else if (*str >= 'A' && *str <= 'F')
	val += 10 + *str - 'A';
      else if (*str >= 'a' && *str <= 'f')
	val += 10 + *str - 'a';
      else
	return -1;
      if (i < NROFHEXDIGITS - 1)
	val *= 16;
      str++;
    }
  return val;
}


/* Decode the C formatted string SRC and store the result in the
   buffer *DESTP which is LEN bytes long.  If LEN is zero, then a
   large enough buffer is allocated with malloc and *DESTP is set to
   the result.  Currently, LEN is only used to specify if allocation
   is desired or not, the caller is expected to make sure that *DESTP
   is large enough if LEN is not zero.  */
gpgme_error_t
_gpgme_decode_c_string (const char *src, char **destp, size_t len)
{
  char *dest;

  /* Set up the destination buffer.  */
  if (len)
    {
      if (len < strlen (src) + 1)
	return gpg_error (GPG_ERR_INTERNAL);

      dest = *destp;
    }
  else
    {
      /* The converted string will never be larger than the original
	 string.  */
      dest = malloc (strlen (src) + 1);
      if (!dest)
	return gpg_error_from_errno (errno);

      *destp = dest;
    }

  /* Convert the string.  */
  while (*src)
    {
      if (*src != '\\')
	{
	  *(dest++) = *(src++);
	  continue;
	}

      switch (src[1])
	{
#define DECODE_ONE(match,result)	\
	case match:			\
	  src += 2;			\
	  *(dest++) = result;		\
	  break;

	  DECODE_ONE ('\'', '\'');
	  DECODE_ONE ('\"', '\"');
	  DECODE_ONE ('\?', '\?');
	  DECODE_ONE ('\\', '\\');
	  DECODE_ONE ('a', '\a');
	  DECODE_ONE ('b', '\b');
	  DECODE_ONE ('f', '\f');
	  DECODE_ONE ('n', '\n');
	  DECODE_ONE ('r', '\r');
	  DECODE_ONE ('t', '\t');
	  DECODE_ONE ('v', '\v');

	case 'x':
	  {
	    int val = _gpgme_hextobyte (&src[2]);

	    if (val == -1)
	      {
		/* Should not happen.  */
		*(dest++) = *(src++);
		*(dest++) = *(src++);
		if (*src)
		  *(dest++) = *(src++);
		if (*src)
		  *(dest++) = *(src++);
	      }
	    else
	      {
		if (!val)
		  {
		    /* A binary zero is not representable in a C
		       string.  */
		    *(dest++) = '\\';
		    *(dest++) = '0'; 
		  }
		else 
		  *((unsigned char *) dest++) = val;
		src += 4;
	      }
	  }
	  break;

	default:
	  {
	    /* Should not happen.  */
	    *(dest++) = *(src++);
	    *(dest++) = *(src++);
	  }
        } 
    }
  *(dest++) = 0;

  return 0;
}


/* Decode the percent escaped string SRC and store the result in the
   buffer *DESTP which is LEN bytes long.  If LEN is zero, then a
   large enough buffer is allocated with malloc and *DESTP is set to
   the result.  Currently, LEN is only used to specify if allocation
   is desired or not, the caller is expected to make sure that *DESTP
   is large enough if LEN is not zero.  If BINARY is 1, then '\0'
   characters are allowed in the output.  */
gpgme_error_t
_gpgme_decode_percent_string (const char *src, char **destp, size_t len,
			      int binary)
{
  char *dest;

  /* Set up the destination buffer.  */
  if (len)
    {
      if (len < strlen (src) + 1)
	return gpg_error (GPG_ERR_INTERNAL);

      dest = *destp;
    }
  else
    {
      /* The converted string will never be larger than the original
	 string.  */
      dest = malloc (strlen (src) + 1);
      if (!dest)
	return gpg_error_from_errno (errno);

      *destp = dest;
    }

  /* Convert the string.  */
  while (*src)
    {
      if (*src != '%')
	{
	  *(dest++) = *(src++);
	  continue;
	}
      else
	{
	  int val = _gpgme_hextobyte (&src[1]);
	  
	  if (val == -1)
	    {
	      /* Should not happen.  */
	      *(dest++) = *(src++);
	      if (*src)
		*(dest++) = *(src++);
	      if (*src)
		*(dest++) = *(src++);
	    }
	  else
	    {
	      if (!val && !binary)
		{
		  /* A binary zero is not representable in a C
		     string.  */
		  *(dest++) = '\\';
		  *(dest++) = '0'; 
		}
	      else 
		*((unsigned char *) dest++) = val;
	      src += 3;
	    }
	}
    }
  *(dest++) = 0;

  return 0;
}


/* Parse the string TIMESTAMP into a time_t.  The string may either be
   seconds since Epoch or in the ISO 8601 format like
   "20390815T143012".  Returns 0 for an empty string or seconds since
   Epoch. Leading spaces are skipped. If ENDP is not NULL, it will
   point to the next non-parsed character in TIMESTRING. */
time_t
_gpgme_parse_timestamp (const char *timestamp, char **endp)
{
  /* Need to skip leading spaces, because that is what strtoul does
     but not our ISO 8601 checking code. */
  while (*timestamp && *timestamp== ' ')
    timestamp++;
  if (!*timestamp)
    return 0;

  if (strlen (timestamp) >= 15 && timestamp[8] == 'T')
    {
      struct tm buf;
      int year;

      year = atoi_4 (timestamp);
      if (year < 1900)
        return (time_t)(-1);

      /* Fixme: We would better use a configure test to see whether
         mktime can handle dates beyond 2038. */
      if (sizeof (time_t) <= 4 && year >= 2038)
        return (time_t)2145914603; /* 2037-12-31 23:23:23 */

      memset (&buf, 0, sizeof buf);
      buf.tm_year = year - 1900;
      buf.tm_mon = atoi_2 (timestamp+4) - 1; 
      buf.tm_mday = atoi_2 (timestamp+6);
      buf.tm_hour = atoi_2 (timestamp+9);
      buf.tm_min = atoi_2 (timestamp+11);
      buf.tm_sec = atoi_2 (timestamp+13);

      if (endp)
        *endp = (char*)(timestamp + 15);
#ifdef HAVE_TIMEGM
      return timegm (&buf);
#else
      {
        time_t tim;
        
        putenv ("TZ=UTC");
        tim = mktime (&buf);
#ifdef __GNUC__
#warning fixme: we must somehow reset TZ here.  It is not threadsafe anyway.
#endif
        return tim;
      }
#endif /* !HAVE_TIMEGM */
    }
  else
    return (time_t)strtoul (timestamp, endp, 10);
}




static struct
{
  char *name;
  gpgme_error_t err;
} gnupg_errors[] =
  {
    { "EOF", GPG_ERR_EOF },
    { "No_Error", GPG_ERR_NO_ERROR },
    { "General_Error", GPG_ERR_GENERAL },
    { "Out_Of_Core", GPG_ERR_ENOMEM },
    { "Invalid_Value", GPG_ERR_INV_VALUE },
    { "IO_Error", GPG_ERR_GENERAL },
    { "Resource_Limit", GPG_ERR_RESOURCE_LIMIT },
    { "Internal_Error", GPG_ERR_INTERNAL },
    { "Bad_Certificate", GPG_ERR_BAD_CERT },
    { "Bad_Certificate_Chain", GPG_ERR_BAD_CERT_CHAIN},
    { "Missing_Certificate", GPG_ERR_MISSING_CERT },
    { "No_Data", GPG_ERR_NO_DATA },
    { "Bad_Signature", GPG_ERR_BAD_SIGNATURE },
    { "Not_Implemented", GPG_ERR_NOT_IMPLEMENTED },
    { "Conflict", GPG_ERR_CONFLICT },
    { "Bug", GPG_ERR_BUG },
    { "Read_Error", GPG_ERR_GENERAL },
    { "Write_Error", GPG_ERR_GENERAL },
    { "Invalid_Line", GPG_ERR_GENERAL },
    { "Incomplete_Line", GPG_ERR_INCOMPLETE_LINE },
    { "Invalid_Response", GPG_ERR_INV_RESPONSE },
    { "Agent_Error", GPG_ERR_AGENT },
    { "No_Public_Key", GPG_ERR_NO_PUBKEY },
    { "No_Secret_Key", GPG_ERR_NO_SECKEY },
    { "File_Open_Error", GPG_ERR_GENERAL },
    { "File_Create_Error", GPG_ERR_GENERAL },
    { "File_Error", GPG_ERR_GENERAL },
    { "Not_Supported", GPG_ERR_NOT_SUPPORTED },
    { "Invalid_Data", GPG_ERR_INV_DATA },
    { "Assuan_Server_Fault", GPG_ERR_ASSUAN_SERVER_FAULT },
    { "Assuan_Error", GPG_ERR_ASSUAN },
    { "Invalid_Session_Key", GPG_ERR_INV_SESSION_KEY },
    { "Invalid_Sexp", GPG_ERR_INV_SEXP },
    { "Unsupported_Algorithm", GPG_ERR_UNSUPPORTED_ALGORITHM },
    { "No_PIN_Entry", GPG_ERR_NO_PIN_ENTRY },
    { "PIN_Entry_Error", GPG_ERR_NO_PIN_ENTRY },
    { "Bad_PIN", GPG_ERR_BAD_PIN },
    { "Bad_Passphrase", GPG_ERR_BAD_PASSPHRASE },
    { "Invalid_Name", GPG_ERR_INV_NAME },
    { "Bad_Public_Key", GPG_ERR_BAD_PUBKEY },
    { "Bad_Secret_Key", GPG_ERR_BAD_SECKEY },
    { "Bad_Data", GPG_ERR_BAD_DATA },
    { "Invalid_Parameter", GPG_ERR_INV_PARAMETER },
    { "Tribute_to_D_A", GPG_ERR_TRIBUTE_TO_D_A },
    { "No_Dirmngr", GPG_ERR_NO_DIRMNGR },
    { "Dirmngr_Error", GPG_ERR_DIRMNGR },
    { "Certificate_Revoked", GPG_ERR_CERT_REVOKED },
    { "No_CRL_Known", GPG_ERR_NO_CRL_KNOWN },
    { "CRL_Too_Old", GPG_ERR_CRL_TOO_OLD },
    { "Line_Too_Long", GPG_ERR_LINE_TOO_LONG },
    { "Not_Trusted", GPG_ERR_NOT_TRUSTED },
    { "Canceled", GPG_ERR_CANCELED },
    { "Bad_CA_Certificate", GPG_ERR_BAD_CA_CERT },
    { "Certificate_Expired", GPG_ERR_CERT_EXPIRED },
    { "Certificate_Too_Young", GPG_ERR_CERT_TOO_YOUNG },
    { "Unsupported_Certificate", GPG_ERR_UNSUPPORTED_CERT },
    { "Unknown_Sexp", GPG_ERR_UNKNOWN_SEXP },
    { "Unsupported_Protection", GPG_ERR_UNSUPPORTED_PROTECTION },
    { "Corrupted_Protection", GPG_ERR_CORRUPTED_PROTECTION },
    { "Ambiguous_Name", GPG_ERR_AMBIGUOUS_NAME },
    { "Card_Error", GPG_ERR_CARD },
    { "Card_Reset", GPG_ERR_CARD_RESET },
    { "Card_Removed", GPG_ERR_CARD_REMOVED },
    { "Invalid_Card", GPG_ERR_INV_CARD },
    { "Card_Not_Present", GPG_ERR_CARD_NOT_PRESENT },
    { "No_PKCS15_App", GPG_ERR_NO_PKCS15_APP },
    { "Not_Confirmed", GPG_ERR_NOT_CONFIRMED },
    { "Configuration_Error", GPG_ERR_CONFIGURATION },
    { "No_Policy_Match", GPG_ERR_NO_POLICY_MATCH },
    { "Invalid_Index", GPG_ERR_INV_INDEX },
    { "Invalid_Id", GPG_ERR_INV_ID },
    { "No_Scdaemon", GPG_ERR_NO_SCDAEMON },
    { "Scdaemon_Error", GPG_ERR_SCDAEMON },
    { "Unsupported_Protocol", GPG_ERR_UNSUPPORTED_PROTOCOL },
    { "Bad_PIN_Method", GPG_ERR_BAD_PIN_METHOD },
    { "Card_Not_Initialized", GPG_ERR_CARD_NOT_INITIALIZED },
    { "Unsupported_Operation", GPG_ERR_UNSUPPORTED_OPERATION },
    { "Wrong_Key_Usage", GPG_ERR_WRONG_KEY_USAGE }
  };
    

gpgme_error_t
_gpgme_map_gnupg_error (char *err)
{
  unsigned int i;

  /* Future version of GnuPG might return the error code directly, so
     we first test for a a numerical value and use that verbatim.
     Note that this numerical value might be followed by an
     underschore and the textual representation of the error code. */
  if (*err >= '0' && *err <= '9')
    return strtoul (err, NULL, 10);

  /* Well, this is a token, use the mapping table to get the error.
     The drawback is that we won't receive an error source and have to
     use GPG as source. */
  for (i = 0; i < DIM (gnupg_errors); i++)
    if (!strcmp (gnupg_errors[i].name, err))
      return gpg_err_make (GPG_ERR_SOURCE_GPG, gnupg_errors[i].err);

  return gpg_err_make (GPG_ERR_SOURCE_GPG, GPG_ERR_GENERAL);
}